Application of High-voltage Frequency Converter in Dust Fan of Ferroalloy Electric Furnace

The production of ferroalloys mostly depends on the reduction of ores such as metal oxides. This reduction can only be achieved at a higher temperature and consumes a lot of energy. The electric furnace is the main equipment for the production of ferroalloys. The high-temperature flue gas produced by the electric furnace and the high-voltage test transformer enter the air cooler through the flue to cool and then enter the bag filter. The dust accumulated by the dust collector is discharged by the dust ash hopper, and the purified exhaust gas is sent into the chimney through the fan and discharged into the atmosphere. The structure of the dust removal system is shown in Figure 1.

Application of High-voltage Frequency Converter in Dust Fan of Ferroalloy Electric Furnace

Figure 1 Dust removal system structure

The harmful substances produced during the ironmaking of the electric furnace are mainly reflected in the three stages of feeding the electric furnace, smelting the high-voltage test transformer and tapping the iron. Electric furnace smelting is generally divided into a melting period, an oxidation period and a reduction period, in which the oxidation period strengthens decarbonization, and a large amount of reddish brown smoke is generated due to oxygen blowing or ore addition. Among the three smelting periods mentioned above, the amount of flue gas generated during the oxidation period is the largest DC high-voltage generator, with the highest dust concentration and flue gas temperature. Therefore, the electric furnace dust removal system is designed according to the maximum smoke and dust discharge during the oxidation period. On the basis of the maximum air volume demand of the system, the safety margin is increased by 1.1 to 1.3 times to select the design of the dust removal fan. The oxygen blowing period in the entire smelting over-voltage test transformer process accounts for 30 to 35%. At this time, the fan is running at a higher load, while the rest of the time is at a lower operating condition. Obviously, the utilization rate of the dust removal system is very low and the system efficiency is poor.

For a long time, no matter which operation stage the electric furnace is in, the size of the dust generated by the high-voltage test transformer has made the dust removal fan run at full speed. Tengda Northwest Ferroalloy Co., Ltd. originally used a hydraulic coupling to adjust, which has low efficiency, large power consumption, and a large amount of electrical energy waste. As the market competition continues to intensify, energy saving and consumption reduction, and improving production efficiency have become one of the effective means of improving the competitiveness of the enterprise high-voltage test transformer industry.

In order to meet the requirements of the inverter in the transformation of high-voltage frequency conversion, our factory conducts a serious analysis in accordance with the principle of safety first and reliable quality, and believes that the use of jd-bp37 high-voltage inverter can fully meet the requirements, and has developed the following technical plan. This plan has The following features:

(1) Excellent speed regulation performance to meet the negative DC high voltage generator load process requirements;

(2) Good energy-saving effect, improve system operation efficiency;

(3) Achieve soft start of the system, reduce start-up impact, reduce maintenance costs, and extend equipment life;

(4) The system is safe and reliable, and ensure that the high-voltage test transformer keeps the load running continuously;

(5) Convenient and flexible control and high level of automation.

2 Inverter selection and performance characteristics

During the design, according to the motor capacity and the altitude, the high-voltage inverter is selected to transform the fan system. The inverter is connected in the original control loop, and the power / frequency conversion is performed by the bypass switch cabinet to maintain the original start-stop operation. The way is unchanged. After the transformation, the operation of the high-pressure fan is controlled by the high-voltage inverter. DC high voltage generator

The smelting period of the electric furnace is generally 70 to 85 minutes, of which the charging is 6 to 10%, the power supply melting is 25 to 30%, the oxygen blowing is 30 to 35%, the reduction period is 15 to 20%, and the iron is 6 to 8%. The flue gas volume and flue gas temperature produced by the electric furnace are different in the DC high-voltage generator section of different production process steps, and the difference is large. During the feeding process, it is mainly the dust generated by the scrap steel and slag during charging. The required dust removal air volume is not large, and the dust is not required to spread and does not pollute the working environment around the electric furnace as the standard. In the process of power transmission, the raw materials are heated by arcing, which causes the combustion of combustible waste to produce waste gas. At this time, the electric furnace needs to heat the charge to a molten DC high-voltage generator, which requires that the dust can be discharged in time, and can not take away the heat of the furnace body too much to ensure the steelmaking cycle. During the blowing of oxygen, not only the dust removal system must be able to expel the waste gas and dust in a timely manner, but also must ensure that the furnace body has a suitable blowing temperature to ensure the end temperature. Therefore, the requirements for the dust removal system are high. Entering the reduction period, blowing oxygen comes to an end, and the dustiness is reduced again. When slag is flushed out of the DC high-voltage generator steel, the main emissions are water vapor and a small amount of exhaust gas generated by the slag.

Through the analysis of the smelting process: the electric furnace has obvious differences in the amount of dust removal air volume at different stages of the ironmaking process, with oxygen blowing smelting being the largest and feeding dust removal being the lowest. In view of the operation mode and equipment characteristics of the DC high-voltage generator of the dust removal fan in the electric furnace dust removal system, the control of the dust removal fan is selected by Shandong Xinfengguang Electronic Technology Development Co., Ltd., which is independently developed and produced, and is suitable for driving the high-voltage asynchronous motor. Inverter.

2.1 Main technical performance indicators

(1) Rated input voltage, 6kv (-20% ~ + 15%);

(2) Input frequency, 45 ~ 55hz;

(3) Input mode, 36 pulse diode full wave rectification input;

(4) Output mode, 6-phase carrier phase-shifted sine wave pulse width modulation output per phase DC high voltage generator

(5) Input power factor, greater than 0.96 (at rated load);

(6) Efficiency (including transformer), greater than 96% (at rated load);

(7) Output frequency, 0-50hz, continuously adjustable;

(8) Frequency resolution DC high voltage generator, 0.01hz;

(9) Overload capacity, 120% continuous, 150% 1min;

(10) Control power supply, dual power supply, 220vac, 5kva;

(11) Cooling method, forced air cooling;

(12) Protection level, ip20;

(13) Analog input, four channels, 0 ~ 5v / 4 ~ 20ma, arbitrarily set;

(14) Analog output, two channels of DC high voltage generator, 0 ~ 5v / 4 ~ 20ma optional;

(15) Switch input and output, 32 in / 16 out (can be expanded according to user requirements);

(16) Communication interface, rs-485 interface;

(17) Operating ambient temperature, 0 ~ 40 ℃;

(18) Storage / transport temperature, -40 ~ 70 ℃;

(19) Ambient humidity, <90% (at 20 ℃), no condensation;

(20) Installation altitude, <1000m DC high-voltage generator (more than 1000m, need to derate operation);

(21) Automatic recording and output of operating parameters, automatic fault recording, current limiting function, output voltage automatic adjustment function, instantaneous power failure automatic tracking function, unit bypass function, etc.

2.2 Dimensions and installation requirements

Inverter dimensions (excluding bypass cabinet)

Length × width × height = 4600 × 1200 × 2300 (mm)

DC high voltage generator of bypass cabinet

Length × width × height = 1200 × 1200 × 2300 (mm)

The inverter adopts the bottom entry and exit line. From the front, the high-voltage entry and exit hole is located at the rear of the left bypass cabinet, and the secondary entry and exit cable hole is located at the front of the control cabinet. The inverter should be installed in the cable trench, as shown in Figure 2.

Application of High-voltage Frequency Converter in Dust Fan of Ferroalloy Electric Furnace

Figure 2 Inverter installation drawing (side)

The inverter is operated from the front. In order to ensure the convenience of operation and maintenance and the effect of ventilation and heat dissipation, the distance between the front of the inverter and the wall is not less than 1.5m, and the distance between the back and top of the inverter is not less than 1m.

Indoor cooling method: DC high-voltage generator air conditioning and refrigeration; wall-mounted exhaust fan; cabinet top with hood for centralized ventilation.

2.3 The main advantages and characteristics of the scenery inverter

Compared with similar products at home and abroad, Fengguang jd-bp series high-voltage inverter has the following advantages and characteristics in product function design, product quality assurance measures, system safety design and service:

(1) The input and output harmonic content is low, and the input power factor is high. Without filter and power factor compensation, it can directly drive the motor;

(2) The system control power supply adopts 220va DC high-voltage generator c and dual-circuit power supply after voltage-isolation and isolation of the high-voltage main power supply. The system runs more reliably and the operation is simpler. It can detect the output of the inverter and the waveform of each point without high-voltage electricity, which is convenient for debugging, maintenance and operator training;

(3) The cooling fan uses the high-voltage main power supply to step down and directly drive the DC high-voltage generator. The fan only runs after the high voltage is applied and the inverter is turned on, avoiding the impact of the cooling fan on the control system when it is started and stopped;

(4) The working power supply of the power unit is an external switching power supply, which avoids the influence of the high-voltage instantaneous power failure on the control power of the unit;

(5) It is more suitable for domestic power grid conditions, the working voltage range of the inverter is (+ 15% ~ -20%) un, such as 6kv series can be stably operated under 6900v voltage conditions;

(6) Instantaneous power failure protection function. When the main power supply is de-energized, the variable-frequency DC high-voltage generator controls the motor to run in the power generation state, charges the unit capacitor, and supplies power to the unit control power supply until the main power supply is restored and the inverter returns to the original operating state. The typical value of the instantaneous power failure time is 3s (the specific time can be determined according to the user's system). If the frequency exceeds 3s, the inverter is protected and the cause of the power failure is checked to avoid accidents caused by the continuous operation of the frequency conversion;

(7) Current limiting function. Avoid starting the inverter or changing the load suddenly, causing the output current of the inverter to be too large and causing protective action;

(8) The operating platform adopts the full Chinese win system, which is stable and easy to learn and use;

(9) Compact structure;

(10) Perfect host computer control function. Can be hard-wired with dcs system for communication or i / o.

(11) The main devices are all DC high-voltage generators, which are mature products of world-class manufacturers. The products are strictly tested from components to semi-finished products and finished products. All series of products have completed 100% 72h load test records before leaving the factory to ensure product reliability.

(12) In terms of system operation safety and reliability design, our company's DC high-voltage generator has exclusive patented technology: a device that extends the service life of electrolytic capacitors.

(13) Strong engineering design ability and willingness to communicate, can be tailored according to the user's site conditions and control requirements, and meet the different needs of users in a timely manner;

(14) The modular design of the power unit can be interchanged with the DC high-voltage generator, and the maintenance is simple;

(15) Modular design of secondary wiring, simple field wiring and short installation cycle.

2.4 Working principle of the primary circuit

The primary circuit is composed of incoming cabinet (bypass cabinet), transformer cabinet, frequency conversion unit cabinet and operation control cabinet. During the maintenance of the inverter or when the inverter fails, the bypass cabinet puts the motor into the industrial DC high voltage generator frequency grid operation to ensure that the production is not affected.

During frequency conversion operation, the frequency converter provides comprehensive protection for the motor.

Manual bypass cabinet (as shown in Figure 3).

Application of High-voltage Frequency Converter in Dust Fan of Ferroalloy Electric Furnace

Figure 3 Inverter installation drawing (side)

In the bypass cabinet shown in Figure 3, there are three high-voltage isolation switches. In order to ensure that power is not supplied to the output end of the inverter, k2 and k3 use electromagnetic interlocking operating mechanism to achieve electromagnetic interlocking. When k1 and k3 close the DC high-voltage generator and k2 is open, the motor runs with frequency conversion; when k1 and k3 are open and k2 is closed, the motor runs at industrial frequency, and the frequency converter is isolated from the high voltage at this time for easy maintenance, debugging.

The bypass cabinet must be interlocked with the superior high-voltage circuit breaker dl. When dl is closed, it is absolutely not allowed to operate the bypass isolation switch and the frequency conversion output isolation switch to prevent arcing and ensure the safety of operators and equipment.

(1) Closing and blocking: After the inverter's "closing permission" signal is connected in parallel with the "power frequency input" signal of the bypass cabinet, it is connected in series to the closing circuit of the high-voltage switch. In the frequency conversion input state, when the inverter is faulty or not ready, the closing of the high-level high-voltage switch (circuit breaker dl) is not allowed; when the bypass is enabled, the closing lock is invalid.

(2) Fault opening: After the inverter's "high voltage breaking" signal DC high voltage generator is connected in series with the bypass cabinet's "frequency switching" signal, it is connected in parallel to the high voltage switch opening circuit. In the frequency conversion input state, when the inverter fails, the inverter high voltage input is disconnected; in the bypass input state, the inverter fault opening is invalid.

(3) Protection: Keep the original protection of the motor and its setting value unchanged.

2.5 Secondary circuit and control

The control system consists of controller, plc and human-machine interface. The controller consists of three fiber optic boards for the DC high-voltage generator, a signal board, a main control board and a power board.

The optical fiber board transmits data signals through the optical fiber and the power unit, and each optical fiber board controls all units of one phase. The fiber board periodically sends a pulse width modulation (pwm) signal or working mode to the unit. The unit receives its trigger command and status signal through the optical fiber, and sends a fault code signal to the optical fiber board when a fault occurs.

The main control board uses a high-speed single-chip computer to complete all functions of the motor-controlled DC high-voltage generator system, and uses a sine wave carrier phase shift method to generate a pulse-width modulated three-phase voltage command. Exchange data with the main control board of the man-machine interface through the rs-232 communication port, provide the status parameters of the inverter, and accept the parameter settings from the main control board of the man-machine interface.

The man-machine interface provides users with a friendly all-Chinese operation interface, which is responsible for information processing and communication with external parties. It can be optionally supervised to realize network control of the inverter. Collect data of DC high voltage generator through main control board and PLC, calculate operating parameters such as current, voltage, power, operating frequency, etc., provide recording function, and realize alarm and protection of motor overload and overcurrent. Connect with the main control board through rs-232 communication port, and connect with plc through rs-485 communication port to monitor the status of the inverter system in real time.

PLC is used for the logic processing of the internal switching signal of the inverter and the DC high-voltage generator and status signal of the on-site operation signal, which enhances the flexibility of the on-site application of the inverter. plc has the ability to process 4 analog inputs and 2 analog outputs. Analog inputs are used to process analog signals such as flow and pressure from the field or setting signals during analog settings; analog output is a frequency given signal.

Application of High-voltage Frequency Converter in Dust Fan of Ferroalloy Electric Furnace

Figure 4 Structure diagram of high-voltage frequency conversion speed control system (take 6 units as an example)

Its system structure is shown in Figure 4. It is composed of phase-shifting transformer, power unit and controller. Fengguang 6kv high-voltage inverter, the transformer has 18 sets of secondary windings, divided into 6 power units / phase, a total of 18 DC high-voltage generator units in three phases, using 36 pulse rectification, the harmonic content of the input terminal is far lower than the national standard.

2.5.1 Control method

There are three control methods for scenery inverter:

(1) Local control: control the start and stop of the DC high voltage generator from the inverter operation interface, and can complete all the control of the inverter;

(2) Remote control: accept the on-off quantity control from the scene through the built-in plc;

(3) Host control: Through the rs-485 interface, using the prpfibus communication protocol DC high voltage generator to receive the control of the host dcs system; or hard connection with dcs.

2.5.2 Speed ​​setting mode (or given mode during closed loop operation):

There are various speed setting methods for the wind and light inverter. In closed-loop operation, the speed setting method of the DC high-voltage generator is the given method of the controlled variable:

(1) Local setting: set the operating frequency through the thin film LCD screen;

(2) Analog setting: Receive dcs system 0 ~ 10v or 4 ~ 20ma analog signal to set the operating frequency or the set value of the controlled quantity;

(3) Communication settings: receive the running frequency or the controlled value given value from the dcs system through communication;

(4) Multi-speed setting: set the multi-speed running speed or the set value of the controlled variable through the switch value;

(5) Closed loop adjustment: the operating frequency is automatically set by pid.

2.5.3 Operation mode

Scenery frequency converter has two operating modes: open loop and closed loop.

(1) Open loop operation: The inverter outputs at the set frequency. The setting methods of frequency (or DC high-voltage generator called speed) are local setting, analog setting, communication setting and multi-level setting.

(2) Closed-loop operation: To achieve tracking control of an operating parameter (such as flow, pressure, temperature, etc., referred to as the controlled quantity, here for pressure) During closed-loop operation, the actual pressure signal comes from the on-site signal, and the pressure expectation DC high-voltage generator value has three settings, which are local setting, analog setting, and communication setting.

2.5.4 External interface

(1) Analog input: 2 channels, 4 ~ 20ma or 0 ~ 5vdc. Input impedance is 250ω when 4 ~ 20ma, and input impedance ≥10mω when 0 ~ 5vdc voltage is input. It is used to receive analog signal of speed setting or controlled variable setting.

(2) Analog output: 2 channels, 4 ~ 20ma or 0 ~ 5vdc output. The maximum impedance is 500ω when outputting from 4 to 20ma, and the minimum impedance is 5000ω when outputting from 0 to 5vdc. Variables such as the running speed of the DC high voltage generator of the inverter and the output current of the inverter are output in an analog manner.

(3) Digital input: 32 channels, photoelectric isolation, isolation voltage 500vac. Receive remote control signal, speed given switch signal and each switch status etc.

(4) Digital output: 16 channels, intermediate relay isolation, isolation voltage 750vac, contact capacity 5a. Output the inverter status, control the main power off and so on.

(5) Communication interface: rs-485, profibus communication protocol, to achieve communication with the host system.

The control wiring is shown in the attached table.

Schedule control wiring number

Application of High-voltage Frequency Converter in Dust Fan of Ferroalloy Electric Furnace

2.5.5 All Chinese windows man-machine interface

The full Chinese windows man-machine interface is shown in Figure 5.

Application of High-voltage Frequency Converter in Dust Fan of Ferroalloy Electric Furnace

Figure 5

The main interface is as follows:

Parameter setting interface (as shown in Figure 6).

Application of High-voltage Frequency Converter in Dust Fan of Ferroalloy Electric Furnace

Figure 6 Human-machine interface

3 Working principle

Scenery frequency converter adopts advanced power unit series stack wave (also called power unit multiplex structure) mode, sine wave pwm modulation method, and uses mature low-voltage frequency converter technology and power device igbt to guarantee the system reliability in principle And the input and output waveforms of the inverter are greatly improved. In the United States, the inverter is said to be perfect without harmonics.

Optical fiber communication is used between the power unit and the control system to achieve complete electrical isolation between the strong and weak currents, which improves the anti-interference ability of the entire system.

4 Unit bypass and redundant design

In order to meet the requirements of continuous operation of the test to the greatest extent, this system provides two bypass operation modes: unit bypass and power frequency bypass.

4.1 Unit bypass

During operation, if a power unit has a bypassable failure (such as unit overheating, unit overcurrent, igbt failure, etc.), the system will automatically bypass the failed unit and the other two phases at the same position. After the unit is bypassed, the frequency converter will run in reduced capacity due to the reduction of the number of series units per phase (the rated output current remains unchanged, and the rated voltage of the DC high-voltage generator decreases). At this time, if the operating frequency of the inverter is low, the unit bypass does not have any impact on the operation of the inverter.

The power unit uses the thyristor as the bypass device. The entire bypass DC high-voltage generator circuit process is in the order of microseconds and will not impact the operation. Therefore, the bypass DC high-voltage generator is disturbance-free.

When the inverter unit is in bypass operation, a minor fault alarm signal will be given. When conditions permit, the user should withdraw the inverter from operation as soon as possible and replace the faulty unit.

4.2 Power frequency bypass

When the inverter fails to run due to a serious fault, the inverter will immediately cut off the high-voltage input, and the system will automatically put the motor into power frequency operation to ensure the continuity of production.

As can be seen from the above points, first of all, the inverter of wind-solar DC high-voltage generator is stable and reliable, and secondly, even if the inverter fails, the motor can continue to run through corresponding means and will not affect production.

5 Analysis of fan characteristics and energy-saving benefits

The fan is a square torque load, and the relationship between the speed n and the air volume q, wind pressure h and fan shaft power is:

q1 = q2 (n1 / n2), h1 = h2 (n1 / n2) 2, n1 DC high voltage generator = n2 (n1 / n2) 3

Of course, the decrease of the speed will also cause the decrease of the efficiency and the effect on the efficiency of the additional control device. Assuming that the efficiency is η, generally 80%.

The power consumed when using variable frequency technology to adjust different air volumes is:

p change = n3p1 / η

In the original operating state, the opening of the fan baffle is about 70%. After the inverter is converted into a DC high-voltage generator, the damper is fully opened, the motor speed is adjusted, and the frequency is adjusted to 70% of the power frequency.

Then n = n1 / n2 = 38/50 = 0.76

(1) 201 # fan

The motor parameters are:

p0 = 800kw u0 = 6000v i0 = 89.54a cosφ = 0.90

The actual operating power of the original system is p1≈515kw

The power consumption of the DC high-voltage generator at variable frequency and low speed (38hz) is:

p becomes 1 = n3p1 / η = 0.763 × 515 / 0.80 = 282kw

After the conversion of frequency conversion, it can run at 38hz when blowing, which can meet the needs of production.

After frequency conversion, the energy saved per hour when blowing is:

â–³ p = p1-p change 2 = 515-280 = 235kw

According to the electric furnace, iron is tapped four times a day, and the average smelting time per furnace is 4 hours.

Total energy saving w = △ p × t = 235 × 4 = 940kw · h

Based on electricity cost 0.31 yuan / kw · h, the DC high-voltage generator is 4 furnaces per day, 300 days per year,

Electricity saving: 0.31 × 4 × 940 × 300 = 349680.00 yuan

(2) 202 # Fan

The motor parameters are:

p0 = 800kw u0 = 6000v i0 = 89.54a cosφ = 0.90

The actual operating power of the original system is p1≈595kw

The power consumption when running under a variable frequency low speed (38hz) DC high voltage generator is:

p variable 1 = n3p1 / η = 0.763 × 595 / 0.80 = 208kw

After the conversion of frequency conversion, it can run at 38hz when blowing, which can meet the needs of production.

After frequency conversion, the energy saved per hour when blowing is:

â–³ p = p1- p change 2 = 595-208 = 387kw

According to the electric furnace, the iron is tapped 4 times a day, and the average smelting time per furnace is 4h.

Total energy saving w = △ p × t = DC high voltage generator 387 × 4 = 1540kw · h

Based on electricity cost 0.31 yuan / kw · h, 4 furnaces per day, 300 days per year,

Electricity saving: 0.31 × 4 × 1540 × 300 = 572880.00 yuan

(3) 101 # fan

The motor parameters are:

p0 = 630kw u0 = 6000v i0 = 71.62a i1 = 60a cosφ = 0.90

The actual operating power of the original system p1 = 1.732 × i1 × u × cosφ =

1.732 × 60 × 6000 × 0.90≈561kw

The power consumption when running at low frequency (38hz) is:

p variable 1 = n3p1 / η = 0.763 DC high voltage generator × 561 / 0.80 = 307kw

After the frequency conversion, it can run at 38hz when blowing, which can meet the needs of production.

After frequency conversion, the energy saved per hour when blowing is:

â–³ p = p1-p change 2 = 561-307 = 254kw

According to the electric furnace, the iron is tapped 4 times a day, and the average smelting time per furnace is 4h

Total energy saving w = △ p × t = 254 × 4 = 1016kw · h

Based on electricity cost 0.31 yuan / kw · h, 4 furnaces per day, 300 days per year,

Electricity saving: 0.31 × 4 × 1016 × 300 = 377952.00 yuan

(4) 102 # fan

The motor parameters are:

p0 = 800kw u0 = 6000v i0 = 89.54a cosφ = 0.90

The actual operating power of the original system is p1≈595kw

The power consumption when running at low frequency (38hz) is:

p variable 1 = n3p1 / η = 0.763 × 595 / 0.80 = 208kw

After the frequency conversion, the DC high voltage generator can run at 38hz when blowing, which can meet the production needs.

After frequency conversion, the energy saved per hour when blowing is:

â–³ p = p1- p change 2 = 595-208 = 387kw

According to the electric furnace, the iron is tapped 4 times a day, and the average smelting time per furnace is 4h.

Total energy saving w = △ p × t = 387 × 4 = 1540kw · h

Based on electricity cost 0.31 yuan / kw · h, 4 furnaces per day, 300 days per year,

Electricity saving: 0.31 × 4 × 1540 × 300 = 572880.00 yuan

6 Conclusion

After the conversion of frequency conversion, energy saving is the main factor, followed by many other benefits.

(1) The variable frequency speed regulator has good reliability, wide speed range and smooth to meet the process requirements, soft start, small start current can also reduce the impact on the grid;

(2) The various protection functions of the frequency conversion system are reliable, thereby eliminating the phenomenon that the DC high-voltage generator burns the motor due to motor overload or single-phase operation, ensuring safe operation;

(3) Reduce the amount of equipment maintenance and repair, and reduce maintenance costs;

(4) Reduce the opening and closing times of the regulating valve and reduce the labor intensity of the DC high-voltage generator employees;

(5) After the transformation, the control procedures are simplified, the operation is more convenient, the production efficiency is improved, and the purpose of energy saving and consumption reduction is achieved. Its comprehensive benefits are particularly obvious.

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