Cooling device and cooling method for activated carbon preparation

Abstract

The invention discloses a cooling device and a cooling method for activated carbon preparation. The cooling device comprises a material activation mechanism, a cooling mechanism, a heat exchange mechanism, a circulating cooling mechanism and a dust removal mechanism, the material activation mechanism is used for completing conversion from the carbonized material to the activated material; the cooling mechanism is communicated with the material activation mechanism and is used for cooling the activated material; the heat exchange mechanism is communicated with the cooling mechanism and is used for exchanging heat with the cooling mechanism and completing anaerobic flue gas circulation; the circulating cold supply mechanism communicates with the cooling mechanism and the heat exchange mechanism and provides cold for the cooling mechanism and the heat exchange mechanism; and the dust removal mechanism is communicated with the material activation mechanism and is used for removing dust from the flue gas. The problems of low activated carbon cooling efficiency, after-combustion, water pollution and the like in the activated carbon preparation process can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of activated carbon generation, and in particular to a cooling device and a cooling method for preparing activated carbon. Background Art

[0002] Activated carbon is obtained by carbonizing solid carbonaceous materials (such as coal, wood, hard nut shells, fruit cores, resins, etc.) at 600-900℃ in an airtight condition, and then oxidizing and activating them with air, carbon dioxide, water vapor or a mixture of the three at 400-900℃. The temperature of the activated material reaches about 500℃, and it needs to be cooled down or cooled to room temperature before packaging and storage. At present, activated carbon production enterprises use natural cooling, spray cooling or conveyor with cooling for cooling, but there are problems such as low cooling efficiency, water pollution, high energy consumption of secondary drying, and easy occurrence of incomplete cooling causing activated carbon to reignite.

[0003] Therefore, how to design a cooling device and cooling method for the preparation of activated carbon so that the activated carbon can be quickly cooled to room temperature during the production process has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a cooling device and a cooling method for the preparation of activated carbon, so as to solve the problems of low cooling efficiency of activated carbon, re-ignition, water pollution, etc. during the preparation of activated carbon.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] A cooling device for preparing activated carbon, comprising: a material activation mechanism, a cooling mechanism, a heat exchange mechanism, a circulating cooling mechanism and a dust removal mechanism;

[0007] The material activation mechanism is used to complete the transformation of carbonized material into activated material;

[0008] The cooling mechanism is connected to the material activation mechanism and is used to cool the activated material;

[0009] The heat exchange mechanism is connected to the cooling mechanism and is used to exchange heat with the cooling mechanism and complete the anaerobic flue gas circulation;

[0010] The circulating cooling mechanism is connected to the cooling mechanism and the heat exchange mechanism respectively to provide cooling capacity for the cooling mechanism and the heat exchange mechanism;

[0011] The dust removal mechanism is connected with the material activation mechanism and is used for removing dust from the flue gas.

[0012] Furthermore, the material activation mechanism includes an activation furnace blower, a carbonization silo, an elevator and a rotary activation furnace. The carbonization silo is airtightly connected to the furnace head of the rotary activation furnace through the elevator. The furnace head is externally connected to a steam pipe, and the activation furnace feed inlet furnace head is also connected to the activation furnace blower.

[0013] Furthermore, the cooling mechanism includes a rotary cooler and an activation silo, the rotary activation furnace is connected to the rotary cooler via a gravity flap valve, and the rotary cooler is connected to the activation silo.

[0014] Furthermore, the heat exchange mechanism includes an anaerobic flue gas heat exchanger and an anaerobic flue gas induced draft fan; the flue gas is cooled by the anaerobic flue gas heat exchanger and then transported to the rotary cooler through the anaerobic flue gas induced draft fan; the low-temperature anaerobic flue gas and the high-temperature activated material undergo convection heat exchange in the rotary cooler and then return to the anaerobic flue gas heat exchanger for heat exchange, completing the anaerobic flue gas circulation.

[0015] Furthermore, a second pressure transmitter is provided on the pipeline connecting the anaerobic flue gas heat exchanger and the rotary cooler, and a temperature transmitter is provided on the pipeline connecting the anaerobic flue gas heat exchanger and the anaerobic flue gas induced draft fan.

[0016] Furthermore, the circulating cooling mechanism includes a cooling water tank, a cooling tower and a cooling tower circulating water pump. The cooling water tank is circulatingly connected to the cooling tower through the cooling tower circulating water pump; the cooling water tank is circulatingly connected to the water-cooled jacket device wrapped around the outer layer of the rotary cooler through the cooler cooling water circulating pump; the cooling water tank is circulatingly connected to the anaerobic flue gas heat exchanger through the anaerobic flue gas heat exchanger circulating water pump.

[0017] Furthermore, the dust removal mechanism includes a waste heat boiler, a cyclone dust collector, a bag dust collector and a flue gas induced draft fan. The rotary activation furnace is connected to the waste heat boiler, the cyclone dust collector, the bag dust collector and the flue gas induced draft fan in sequence through an exhaust pipe; a pressure transmitter is installed on the exhaust pipe of the rotary activation furnace.

[0018] A cooling method for preparing activated carbon, comprising:

[0019] The raw materials in the carbonized material bin are transported to the rotary activation furnace by the elevator to complete the transformation of carbonized materials into activated materials;

[0020] Part of the heat generated by the rotary activation furnace is used to heat the carbonized material through the radiation tube to maintain the activation reaction of the carbonized material in the rotary activation furnace, and the other part is extracted by the flue gas induced draft fan in the form of high-temperature flue gas; the high-temperature flue gas is recovered by the waste heat boiler, and then dedusted by the cyclone dust collector and the bag dust collector in turn, and then discharged into the atmosphere through the chimney by the flue gas induced draft fan;

[0021] The activated material falls into the rotary cooler through the gravity flap valve, and the cooled activated material is sent to the activated material bin; the rotary cooler adopts the water-cooled jacket device water-cooled heat conduction method and the anaerobic cold flue gas is introduced for convection heat exchange to achieve rapid cooling of the activated material;

[0022] A stream of flue gas is taken from the exhaust gas, cooled by the anaerobic flue gas heat exchanger, and then transported to the rotary cooler through the anaerobic flue gas induced draft fan; the low-temperature anaerobic flue gas and the high-temperature activated material undergo convection heat exchange in the rotary cooler, and then return to the anaerobic flue gas heat exchanger for heat exchange to complete the anaerobic flue gas circulation; when the flue gas circulation is normal, the electric valve is closed to allow the rotary cooler to enter the anaerobic flue gas self-circulation;

[0023] The circulating water of the rotary cooler and the anaerobic flue gas heat exchanger converge into the same cooling water tank 10;

[0024] The cooling water tank is cooled by an indirect cooling tower, and the cooling tower circulating water pump is controlled by the cooling tower control system, ultimately ensuring that the water temperature of the cooling water tank is stable within a certain range.

[0025] Beneficial effects of the present invention:

[0026] The present invention provides a cooling device and a cooling method for the preparation of activated carbon, so that the activated material is not only cooled by heat conduction through the inner water-cooled wall in the rotary activation furnace, but also cooled by convection heat exchange with the anaerobic cold flue gas. The two cooling methods work together to not only improve the cooling efficiency of the activated material, but also cool the activated material more thoroughly, and prevent the activated material from re-igniting after the pile is piled due to the outer layer of the activated material being cooled but the internal residual heat still remaining. Compared with the cooling method of directly spraying water on the activated material for rapid cooling, the present invention prevents the secondary pollution of the activated material caused by the spraying water, reduces the consumption of water resources, does not require secondary drying, reduces energy consumption, and has a good effect on the preparation of high-quality activated materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention.

[0028] Among them, in the figure:

[0029] 1. Activation furnace blower; 2. Carbonization silo; 3. Elevator; 4. Rotary activation furnace; 5. Gravity flap valve; 6. Pressure transmitter 2; 7. Rotary cooler; 8. Activation silo; 9. Cooling water circulation pump of cooler; 10. Cooling water tank; 11. Waste heat boiler; 12. Pressure transmitter 1; 13. Electric valve; 14. Circulating water pump of anaerobic flue gas heat exchanger; 15. Cyclone dust collector; 16. Bag dust collector; 17. Flue gas induced draft fan; 18. Chimney; 19. Anaerobic flue gas heat exchanger; 20. Temperature transmitter; 21. Anaerobic flue gas induced draft fan; 22. Cooling tower; 23. Circulating water pump of cooling tower. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] refer to Figure 1 , the present invention provides a cooling device for the preparation of activated carbon, comprising: a material activation mechanism, a cooling mechanism, a heat exchange mechanism, a circulating cooling mechanism and a dust removal mechanism;

[0032] The material activation mechanism is used to complete the transformation of carbonized material into activated material;

[0033] The cooling mechanism is connected to the material activation mechanism and is used to cool the activated material;

[0034] The heat exchange mechanism is connected to the cooling mechanism and is used to exchange heat with the cooling mechanism and complete the anaerobic flue gas circulation;

[0035] The circulating cooling mechanism is connected to the cooling mechanism and the heat exchange mechanism respectively to provide cooling capacity for the cooling mechanism and the heat exchange mechanism;

[0036] The dust removal mechanism is connected with the material activation mechanism and is used for removing dust from the flue gas.

[0037] The material activation mechanism includes an activation furnace blower 1, a carbonization silo 2, an elevator 3 and a rotary activation furnace 4. The carbonization silo 2 is airtightly connected to the burner head of the rotary activation furnace 4 through the elevator 3. The burner head is externally connected to a steam pipe. Water vapor and carbon atoms inside the carbonized material react chemically under high temperature to generate hydrogen, carbon monoxide and carbon dioxide and escape to form a pore structure. The activation furnace feed port burner is also connected to the activation furnace blower 1. The activation furnace blower 1 delivers air to the radiation tube in the rotary activation furnace 4. The oxygen in the air reacts with the generated hydrogen and carbon monoxide in the radiation tube to release a large amount of heat and generate water and carbon dioxide.

[0038] The dust removal mechanism includes a waste heat boiler 11, a cyclone dust collector 15, a bag dust collector 16 and a flue gas induced draft fan 17. The rotary activation furnace 4 is connected to the waste heat boiler 11, the cyclone dust collector 15, the bag dust collector 16 and the flue gas induced draft fan 17 in sequence through a flue gas exhaust pipe; a pressure transmitter 12 is installed on the flue gas exhaust pipe of the rotary activation furnace 4. Part of the heat released by the radiation tube heats the carbonized material through the radiation tube to maintain the activation reaction of the carbonized material in the rotary activation furnace 4, and the other part is extracted by the flue gas induced draft fan 17 in the form of high-temperature flue gas. After the high-temperature flue gas recovers heat through the waste heat boiler 11, it passes through the cyclone dust collector 15 and the bag dust collector 16 in sequence for dust removal, and then is discharged into the atmosphere through the chimney 18 by the flue gas induced draft fan 17 (after the flue gas induced draft fan 17, it can be determined whether to install a desulfurization and denitrification device according to the flue gas composition). A pressure transmitter 12 is installed on the exhaust pipe of the rotary activation furnace 4, and the exhaust fan 17 adopts frequency conversion speed control to stabilize the exhaust negative pressure of the rotary activation furnace 4 and prevent the exhaust of smoke.

[0039] The cooling mechanism includes a rotary cooler 7 and an activation silo 8. The rotary activation furnace 4 is connected to the rotary cooler 7 through a gravity flap valve 5, and the rotary cooler 7 is connected to the activation silo 8. The inclined rotary activation furnace 4 slowly transports the carbonized material to the activation furnace discharge port by rotating. The carbonized material is transformed into the activated material during the transportation process. The temperature of the activated material is very high at this time and will react with oxygen, so it needs to be cooled in an anaerobic environment. The activated material falls into the rotary cooler 7 through the gravity flap valve 5, and the cooled activated material is sent to the activation silo 8. The rotary cooler 7 uses a water-cooled jacket device for water-cooled heat conduction and a method of introducing anaerobic cold flue gas for convection heat exchange to achieve rapid cooling of the activated material. The activated material in a high-temperature state enters the rotary cooler 7 through the feeding device. The rotary cooler 7 rotates, and its inner lifting plate drives the activated material to fully exchange heat with the anaerobic cold flue gas. At the same time, circulating water flows into the outer jacket to exchange heat with the cylinder of the rotary cooler 7, thereby performing heat exchange on the activated material in the rotary cooler 7. As the cylinder rotates continuously according to the designed inclination and speed, the activated material also rolls forward periodically in the cylinder, thereby transporting the activated material from the feeding end to the discharging end, and ensuring that the activated material is cooled to a suitable temperature during the time it passes through the rotary cooler 7, thereby completing the entire cooling process.

[0040] The heat exchange mechanism includes an anaerobic flue gas heat exchanger 19 and an anaerobic flue gas induced draft fan 21; the flue gas is cooled by the anaerobic flue gas heat exchanger 19 and then transported to the rotary cooler 7 by the anaerobic flue gas induced draft fan 21; the anaerobic flue gas in a low temperature state and the high temperature activated material undergo convection heat exchange in the rotary cooler 7, and then return to the anaerobic flue gas heat exchanger 19 for heat exchange again, completing the anaerobic flue gas circulation. A pressure transmitter 26 is provided on the pipeline connecting the anaerobic flue gas heat exchanger 19 and the rotary cooler 7, and a temperature transmitter 20 is provided on the pipeline connecting the anaerobic flue gas heat exchanger 19 and the anaerobic flue gas induced draft fan 21. In the system startup stage, there is no anaerobic flue gas in the rotary cooler 7, so a stream of flue gas is first taken from the exhaust flue gas, and after cooling by the anaerobic flue gas heat exchanger 19, it is transported to the rotary cooler 7 by the anaerobic flue gas induced draft fan 21. After the low-temperature anaerobic flue gas and the high-temperature activated material undergo convection heat exchange in the rotary cooler 7, they return to the anaerobic flue gas heat exchanger 19 for heat exchange again to complete the anaerobic flue gas circulation. When the flue gas circulation is normal, the electric valve 13 is closed to allow the rotary cooler 7 to enter the anaerobic flue gas self-circulation. A pressure transmitter 26 is installed on the exhaust pipe of the rotary cooler 7, and the anaerobic flue gas induced draft fan 21 adopts variable frequency speed control to stabilize the exhaust negative pressure of the rotary cooler 7 and prevent the flue gas from overflowing.

[0041] Since there is a physical connection channel when the activated material enters the rotary cooler 7 from the rotary activation furnace 4, if the difference between the negative pressure of the furnace in the rotary activation furnace 4 and the negative pressure of the inner cavity in the rotary cooler 7 is too large, it will cause the flue gas to run wild, affecting the stable operation of the entire system, and it is necessary to decouple them. Therefore, a gravity flap valve is arranged in the material channel between the rotary activation furnace 4 and the rotary cooler 7 to cut off the direct connection cavity; in addition, the control system is used to dynamically control the speed of the flue gas induced draft fan 17 and the anaerobic flue gas induced draft fan 21 to achieve the consistency of the exhaust negative pressure of the rotary activation furnace 4 and the rotary cooler 7, further reducing the phenomenon of flue gas running wild.

[0042] The circulating cooling mechanism includes a cooling water tank 10, a cooling tower 22 and a cooling tower circulating water pump 23. The cooling water tank 10 is circulated and connected with the cooling tower 22 through the cooling tower circulating water pump 23; the cooling water tank 10 is circulated and connected with the water-cooled jacket device wrapped around the outer layer of the rotary cooler 7 through the cooling machine cooling water circulating pump 9; the cooling water tank 10 is circulated and connected with the anaerobic flue gas heat exchanger 19 through the anaerobic flue gas heat exchanger circulating water pump 14. Anaerobic flue gas is introduced into one side of the anaerobic flue gas heat exchanger 19, and circulating water is introduced into the other side. The two exchange heat in the anaerobic flue gas heat exchanger 19 to complete the cooling of the anaerobic flue gas. A temperature transmitter 20 is installed on the return pipe of the anaerobic flue gas heat exchanger 19. The anaerobic flue gas heat exchanger circulating water pump 14 adopts variable frequency speed control to achieve adjustable circulating water flow to keep the return temperature of the anaerobic flue gas stable. The circulating water of the rotary cooler 7 and the anaerobic flue gas heat exchanger 19 can be merged into the same cooling water tank 10, or the circulating water heat can be used for other purposes for secondary heat exchange according to actual needs to improve energy utilization. In order to simplify the process, the present invention merges the circulating water into the same cooling water tank 10. The cooling water tank 10 is cooled by an indirect cooling tower 22, and the cooling tower circulating water pump 23 is controlled by the cooling tower control system, which ultimately ensures that the water temperature of the cooling water tank is stable within a certain range.

[0043] The present invention also provides a cooling method for preparing activated carbon, comprising:

[0044] The raw materials in the carbonized material bin are transported to the rotary activation furnace by the elevator to complete the transformation of carbonized materials into activated materials;

[0045] Part of the heat generated by the rotary activation furnace is used to heat the carbonized material through the radiation tube to maintain the activation reaction of the carbonized material in the rotary activation furnace, and the other part is extracted by the flue gas induced draft fan in the form of high-temperature flue gas; the high-temperature flue gas is recovered by the waste heat boiler, and then dedusted by the cyclone dust collector and the bag dust collector in turn, and then discharged into the atmosphere through the chimney by the flue gas induced draft fan;

[0046] The activated material falls into the rotary cooler through the gravity flap valve, and the cooled activated material is sent to the activated material bin; the rotary cooler adopts the water-cooled jacket device water-cooled heat conduction method and the anaerobic cold flue gas is introduced for convection heat exchange to achieve rapid cooling of the activated material;

[0047] A stream of flue gas is taken from the exhaust gas, cooled by the anaerobic flue gas heat exchanger, and then transported to the rotary cooler through the anaerobic flue gas induced draft fan; the low-temperature anaerobic flue gas and the high-temperature activated material undergo convection heat exchange in the rotary cooler, and then return to the anaerobic flue gas heat exchanger for heat exchange to complete the anaerobic flue gas circulation; when the flue gas circulation is normal, the electric valve is closed to allow the rotary cooler to enter the anaerobic flue gas self-circulation;

[0048] The circulating water of the rotary cooler and the anaerobic flue gas heat exchanger converge into the same cooling water tank 10;

[0049] The cooling water tank is cooled by an indirect cooling tower, and the cooling tower circulating water pump is controlled by the cooling tower control system, ultimately ensuring that the water temperature of the cooling water tank is stable within a certain range.

[0050] The present invention provides a cooling device and a cooling method for the preparation of activated carbon, so that the activated material is not only cooled by heat conduction through the inner water-cooled wall in the rotary activation furnace, but also cooled by convection heat exchange with the anaerobic cold flue gas. The two cooling methods work together to not only improve the cooling efficiency of the activated material, but also cool the activated material more thoroughly, and prevent the activated material from re-igniting after the pile is piled due to the outer layer of the activated material being cooled but the internal residual heat still remaining. Compared with the cooling method of directly spraying water on the activated material for rapid cooling, the present invention prevents the secondary pollution of the activated material caused by the spraying water, reduces the consumption of water resources, does not require secondary drying, reduces energy consumption, and has a good effect on the preparation of high-quality activated materials.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling device for preparing activated carbon, characterized in that: include: Material activation mechanism, cooling mechanism, heat exchange mechanism, circulating cooling mechanism and dust removal mechanism; The material activation mechanism is used to complete the transformation of carbonized material into activated material; The cooling mechanism is connected to the material activation mechanism and is used to cool the activated material; The heat exchange mechanism is connected to the cooling mechanism and is used to exchange heat with the cooling mechanism and complete the anaerobic flue gas circulation; The circulating cooling mechanism is connected to the cooling mechanism and the heat exchange mechanism respectively to provide cooling capacity for the cooling mechanism and the heat exchange mechanism; The dust removal mechanism is connected with the material activation mechanism and is used for removing dust from the flue gas.

2. A cooling device for preparing activated carbon according to claim 1, characterized in that: The material activation mechanism includes an activation furnace blower, a carbonization silo, an elevator and a rotary activation furnace. The carbonization silo is airtightly connected to the furnace head of the rotary activation furnace through the elevator. The furnace head is externally connected to a steam pipe. The activation furnace feed inlet furnace head is also connected to the activation furnace blower.

3. A cooling device for preparing activated carbon according to claim 2, characterized in that: The cooling mechanism comprises a rotary cooler and an activation silo. The rotary activation furnace is connected to the rotary cooler through a gravity flap valve, and the rotary cooler is connected to the activation silo.

4. A cooling device for preparing activated carbon according to claim 3, characterized in that: The heat exchange mechanism includes an anaerobic flue gas heat exchanger and an anaerobic flue gas induced draft fan; the flue gas is cooled by the anaerobic flue gas heat exchanger and then transported to the rotary cooler by the anaerobic flue gas induced draft fan; the low-temperature anaerobic flue gas and the high-temperature activated material undergo convection heat exchange in the rotary cooler and then return to the anaerobic flue gas heat exchanger for heat exchange, thereby completing the anaerobic flue gas circulation.

5. A cooling device for preparing activated carbon according to claim 4, characterized in that: A second pressure transmitter is provided on the pipeline connecting the anaerobic flue gas heat exchanger and the rotary cooler, and a temperature transmitter is provided on the pipeline connecting the anaerobic flue gas heat exchanger and the anaerobic flue gas induced draft fan.

6. A cooling device for preparing activated carbon according to claim 5, characterized in that: The circulating cooling mechanism includes a cooling water tank, a cooling tower and a cooling tower circulating water pump. The cooling water tank is circulatingly connected to the cooling tower through the cooling tower circulating water pump; the cooling water tank is circulatingly connected to the water-cooled jacket device wrapped around the outer layer of the rotary cooler through the cooler cooling water circulating pump; the cooling water tank is circulatingly connected to the anaerobic flue gas heat exchanger through the anaerobic flue gas heat exchanger circulating water pump.

7. A cooling device for preparing activated carbon according to claim 2 or 6, characterized in that: The dust removal mechanism includes a waste heat boiler, a cyclone dust collector, a bag dust collector and a flue gas induced draft fan. The rotary activation furnace is connected to the waste heat boiler, the cyclone dust collector, the bag dust collector and the flue gas induced draft fan in sequence through a smoke exhaust pipe; a pressure transmitter is installed on the smoke exhaust pipe of the rotary activation furnace.

8. A cooling method for preparing activated carbon, characterized in that: include: The raw materials in the carbonized material bin are transported to the rotary activation furnace by the elevator to complete the transformation of carbonized materials into activated materials; Part of the heat generated by the rotary activation furnace is used to heat the carbonized material through the radiation tube to maintain the activation reaction of the carbonized material in the rotary activation furnace, and the other part is extracted by the flue gas induced draft fan in the form of high-temperature flue gas; the high-temperature flue gas is recovered by the waste heat boiler, and then dedusted by the cyclone dust collector and the bag dust collector in turn, and then discharged into the atmosphere through the chimney by the flue gas induced draft fan; The activated material falls into the rotary cooler through the gravity flap valve, and the cooled activated material is sent to the activated material bin; the rotary cooler adopts the water-cooled jacket device water-cooled heat conduction method and the anaerobic cold flue gas is introduced for convection heat exchange to achieve rapid cooling of the activated material; A stream of flue gas is taken from the exhaust gas, cooled by the anaerobic flue gas heat exchanger, and then transported to the rotary cooler by the anaerobic flue gas induced draft fan; the low-temperature anaerobic flue gas and the high-temperature activated material undergo convection heat exchange in the rotary cooler, and then return to the anaerobic flue gas heat exchanger for heat exchange, completing the anaerobic flue gas cycle; When the flue gas circulation is normal, close the electric valve to allow the rotary cooler to enter the anaerobic flue gas self-circulation; The circulating water of the rotary cooler and the anaerobic flue gas heat exchanger converge into the same cooling water tank 10; The cooling water tank is cooled by an indirect cooling tower, and the cooling tower circulating water pump is controlled by the cooling tower control system, ultimately ensuring that the water temperature of the cooling water tank is stable within a certain range.

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