Calcium carbide furnace tail gas purification constant-temperature control device and control method

Abstract

The invention relates to the technical field of calcium carbide furnace tail gas treatment, in particular to a calcium carbide furnace tail gas purification constant-temperature control device and method.The calcium carbide furnace tail gas purification constant-temperature control device comprises a water cooling flue, a first sedimentation bin, an air cooling bin, a second sedimentation bin, a filtering device, a nitrogen buffer tank and a controller; the water cooling flue and the first settling bin are communicated with a first tail gas pipeline, the settling bins and the air cooling bin are communicated with a second tail gas pipeline, the air cooling bin and the second settling bin are communicated with a third tail gas pipeline, the second settling bin and the filtering device are communicated with a fourth tail gas pipeline, and the filtering device and the emptying pipeline are communicated with a fifth tail gas pipeline. The fifth tail gas pipeline and the first tail gas pipeline are communicated with a tail gas backflow pipeline, and the nitrogen buffer tank and the tail gas backflow pipeline are communicated with a first nitrogen pipeline. The tail gas temperature of the calcium carbide furnace is effectively reduced, the bearing load of each device caused by high temperature is reduced, the tail gas purification effect of the calcium carbide furnace is improved, and the problem of smoke dust bonding in the tail gas can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of calcium carbide furnace tail gas treatment, and relates to a calcium carbide furnace tail gas purification constant temperature control device and a control method. Background Art

[0002] Calcium carbide furnace is a kind of ore-fired furnace. Its main working principle is to mix coke and limestone in a certain ratio, and then generate calcium carbide through electrode arc smelting reaction. The reaction temperature in the calcium carbide furnace is as high as 2000℃. The reaction of calcium carbide in the furnace will produce a large amount of mixed toxic and harmful gases and a large amount of smoke. The high-temperature gas and dust need to be purified before the qualified calcium carbide furnace tail gas can be discharged into the atmosphere.

[0003] The main raw materials (coke and limestone) in the calcium carbide furnace have different origins, which will cause fluctuations in the working pressure and exhaust gas temperature in the calcium carbide furnace. When high-temperature gas and smoke enter the purification system, the excessively high temperature will bring a large load to the purification equipment. Long-term high-load operation will cause damage to the purification equipment, and will also aggravate the adhesion of smoke in the exhaust gas of the calcium carbide furnace to the inner wall of the purification equipment and the inner wall of the smoke conveying pipeline, ultimately resulting in poor purification effect of the exhaust gas from the calcium carbide furnace. Unqualified calcium carbide furnace exhaust gas is discharged into the atmosphere, which will cause serious pollution to the atmospheric environment.

[0004] Therefore, the existing calcium carbide furnace exhaust gas purification system has problems such as poor purification effect and high failure rate, which has become a technical problem that is difficult for enterprises to solve. Summary of the invention

[0005] The present invention provides a constant temperature control device for purifying tail gas of calcium carbide furnace, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of poor purification effect and high failure rate in the existing tail gas purification system of calcium carbide furnace.

[0006] One of the technical solutions of the present invention is achieved through the following measures: a constant temperature control device for purifying tail gas from a calcium carbide furnace, comprising a water-cooled flue, a first sedimentation bin, an air-cooled bin, a second sedimentation bin, a filtering device, a nitrogen buffer tank, a controller, a top outlet of the water-cooled flue is fixedly connected with a venting pipeline, a lower outlet of the water-cooled flue and a lower inlet of the first sedimentation bin are fixedly connected with a first tail gas pipeline, a top outlet of the first sedimentation bin and a first lower inlet of the air-cooled bin are fixedly connected with a second tail gas pipeline, a top outlet of the air-cooled bin and a lower inlet of the second sedimentation bin are fixedly connected with a third tail gas pipeline, a top outlet of the second sedimentation bin and a lower inlet of the filtering device are fixedly connected with a fourth tail gas pipeline, and the filtering device A fifth tail gas pipeline is fixedly connected between the top outlet and the venting pipeline, a tail gas reflux pipeline is fixedly connected between the fifth tail gas pipeline and the first tail gas pipeline, a first nitrogen pipeline is fixedly connected between the bottom outlet of the nitrogen buffer tank and the tail gas reflux pipeline, a first pressure gauge, a first flow meter, and a first control valve are fixedly installed on the first nitrogen pipeline along the medium flow direction, a first thermometer is fixedly installed on the first tail gas pipeline between the lower outlet of the water-cooled flue and the tail gas reflux pipeline, a second thermometer is fixedly installed on the first tail gas pipeline between the tail gas reflux pipeline and the lower inlet of the first settling bin, and the first pressure gauge, the first flow meter, the first control valve, the first thermometer, and the second thermometer are all electrically connected to the controller.

[0007] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The above device also includes a nitrogen making device, the top inlet of the nitrogen making device is fixedly connected with an air pipeline, and the outlet of the nitrogen making device and the top inlet of the nitrogen buffer tank are fixedly connected with a nitrogen delivery pipeline.

[0008] The above-mentioned filtering device includes a first filter, a second filter, and a third filter. A fourth exhaust pipeline is fixedly connected between the top outlet of the second sedimentation bin and the lower inlet of the first filter, a fifth exhaust pipeline is fixedly connected between the top outlet of the first filter and the venting pipeline, a sixth exhaust pipeline is fixedly connected between the fourth exhaust pipeline and the lower inlet of the second filter, a seventh exhaust pipeline is fixedly connected between the sixth exhaust pipeline and the lower inlet of the third filter, an eighth exhaust pipeline is fixedly connected between the top outlet of the second filter and the fifth exhaust pipeline between the top outlet of the first filter and the exhaust gas return pipeline, and a ninth exhaust pipeline is fixedly connected between the top outlet of the third filter and the fifth exhaust pipeline between the eighth exhaust pipeline and the exhaust gas return pipeline.

[0009] A second nitrogen pipeline is fixedly connected between the first nitrogen pipeline and the tail gas reflux pipeline between the fifth tail gas pipeline and the first nitrogen pipeline. A second pressure gauge, a second flow meter and a second control valve are fixedly installed in sequence on the second nitrogen pipeline along the medium flow direction.

[0010] A third control valve is fixedly installed on the fifth tail gas pipeline between the tail gas reflux pipeline and the venting pipeline.

[0011] A fourth control valve is fixedly installed on the exhaust gas return pipeline between the fifth exhaust gas pipeline and the second nitrogen pipeline, and a fifth control valve is fixedly installed on the exhaust gas return pipeline between the second nitrogen pipeline and the first nitrogen pipeline.

[0012] The above-mentioned device also includes a calcium carbide furnace. The bottom inlet of the water-cooled flue is fixedly connected to the top outlet of the calcium carbide furnace. A third pressure gauge is fixedly installed on the calcium carbide furnace. A sixth control valve is fixedly installed on the vent pipeline. The second inlet at the lower part of the air-cooling bin is fixedly connected to a cold air input pipeline, and an air cooler is fixedly installed on the inlet of the cold air input pipeline.

[0013] A first delivery pump is fixedly installed on the fourth tail gas pipeline between the top outlet of the second settling bin and the sixth tail gas pipeline, and a second delivery pump is fixedly installed on the fifth tail gas pipeline between the ninth tail gas pipeline and the tail gas return pipeline.

[0014] The second pressure gauge, the second flow meter, the second control valve, the third control valve, the fourth control valve, the fifth control valve, the air cooler, the first delivery pump and the second delivery pump are all electrically connected to the controller.

[0015] The second technical solution of the present invention is achieved by the following measures: a control method of a thermostatic control device for tail gas purification of a calcium carbide furnace, comprising: In the first step, the smoke discharged from the calcium carbide furnace enters the water-cooled flue for cooling, and then enters the first settling bin through the first tail gas pipeline for the first dust removal; In the second step, the smoke dust after the first dust removal enters the air cooling bin through the second tail gas pipeline for cooling, and the cooled smoke dust enters the second settling bin through the third tail gas pipeline for the second dust removal; In the third step, the smoke after the second dust removal enters the filtering device through the fourth tail gas pipeline for purification, and the purified smoke returns to the first tail gas pipeline through the tail gas return pipeline, forming a dust removal, cooling, and purification circulation system; In the fourth step, when the temperature of the smoke in the water-cooled flue is too high, the nitrogen in the nitrogen buffer tank enters the first tail gas pipeline through the first nitrogen pipeline and the tail gas return pipeline in sequence, and purges and cools the smoke in the dust removal, cooling, and purification circulation system; In the fifth step, the smoke is returned to the vent pipeline through the fifth tail gas pipeline after dust removal, cooling and purification, and discharged into the atmosphere.

[0016] The present invention can effectively reduce the tail gas temperature of the calcium carbide furnace, improve the tail gas purification effect of the calcium carbide furnace, and also improve the safe operation rate of the tail gas purification equipment of the calcium carbide furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] AttachedFigure 1 This is a schematic diagram of the process structure of Example 1 of the present invention.

[0018] The codes in the attached drawings are: 1 is a water-cooled flue, 2 is a first sedimentation bin, 3 is an air-cooled bin, 4 is a second sedimentation bin, 5 is a nitrogen buffer tank, 6 is a venting pipeline, 7 is a first tail gas pipeline, 8 is a second tail gas pipeline, 9 is a third tail gas pipeline, 10 is a fourth tail gas pipeline, 11 is a fifth tail gas pipeline, 12 is a tail gas reflux pipeline, 13 is a first nitrogen pipeline, 14 is a first pressure gauge, 15 is a first flow meter, 16 is a first control valve, 17 is a first thermometer, 18 is a second thermometer, 19 is a nitrogen generator, 20 is an air pipeline, and 21 is a nitrogen delivery pipeline. , 22 is the first filter, 23 is the second filter, 24 is the third filter, 25 is the sixth tail gas pipeline, 26 is the seventh tail gas pipeline, 27 is the eighth tail gas pipeline, 28 is the ninth tail gas pipeline, 29 is the second nitrogen pipeline, 30 is the second pressure gauge, 31 is the second flow meter, 32 is the second control valve, 33 is the third control valve, 34 is the fourth control, 35 is the fifth control valve, 36 is the calcium carbide furnace, 37 is the third pressure gauge, 38 is the sixth control valve, 39 is the cold air input pipeline, 40 is the air cooler, 41 is the first delivery pump, and 42 is the second delivery pump. DETAILED DESCRIPTION

[0019] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0020] In the present invention, unless otherwise specified, the equipment and devices used are all the equipment and devices known and used in the art.

[0021] For the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 It is determined by the layout direction.

[0022] The present invention will be further described below in conjunction with embodiments: Embodiment 1: As attached Figure 1As shown, the constant temperature control device for purifying tail gas of calcium carbide furnace comprises a water-cooled flue 1, a first sedimentation bin 2, an air-cooled bin 3, a second sedimentation bin 4, a filtering device, a nitrogen buffer tank 5, and a controller. The top outlet of the water-cooled flue 1 is fixedly connected with a venting pipeline 6, the lower outlet of the water-cooled flue 1 and the lower inlet of the first sedimentation bin 2 are fixedly connected with a first tail gas pipeline 7, the top outlet of the first sedimentation bin 2 and the first lower inlet of the air-cooled bin 3 are fixedly connected with a second tail gas pipeline 8, the top outlet of the air-cooled bin 3 and the lower inlet of the second sedimentation bin 4 are fixedly connected with a third tail gas pipeline 9, the top outlet of the second sedimentation bin 4 and the lower inlet of the filtering device are fixedly connected with a fourth tail gas pipeline 10, and the top outlet of the filtering device and the venting pipeline 6 are fixedly connected with a fifth tail gas pipeline. Pipeline 11, a tail gas reflux pipeline 12 is fixedly connected between the fifth tail gas pipeline 11 and the first tail gas pipeline 7, a first nitrogen pipeline 13 is fixedly connected between the bottom outlet of the nitrogen buffer tank 5 and the tail gas reflux pipeline 12, a first pressure gauge 14, a first flow meter 15, and a first control valve 16 are fixedly installed on the first nitrogen pipeline 13 along the flow direction of the medium, a first thermometer 17 is fixedly installed on the first tail gas pipeline 7 between the lower outlet of the water-cooled flue 1 and the tail gas reflux pipeline 12, a second thermometer 18 is fixedly installed on the first tail gas pipeline 7 between the tail gas reflux pipeline 12 and the lower inlet of the first sedimentation bin 2, and the first pressure gauge 14, the first flow meter 15, the first control valve 16, the first thermometer 17, and the second thermometer 18 are all electrically connected to the controller.

[0023] As required, the water-cooled flue 1 can be a water-cooled heat exchanger, which can be a jacketed tube or coil heat exchanger, and the circulating water in the jacket or coil can be used to reduce the temperature of the smoke discharged from the water-cooled flue 1.

[0024] As required, a cloth belt dust collector is provided inside the first sedimentation bin 2 and the second sedimentation bin 4 to effectively remove dust in the smoke (exhaust gas emitted by the calcium carbide furnace).

[0025] According to needs, the real-time temperature value T1 of the smoke discharged from the water-cooled flue 1 collected by the first thermometer 17, when T1≥T2 (T2 is the maximum load-bearing temperature value of the first sedimentation bin 2, the air-cooled bin 3, and the second sedimentation bin 4 in the present invention), the controller opens the first control valve 16, and increases the nitrogen input into the first tail gas pipeline 7 through the first control valve 16 according to the real-time nitrogen pressure value collected by the first pressure gauge 14 and the real-time nitrogen flow rate value collected by the first flowmeter 15, so as to reduce the temperature of the smoke discharged from the water-cooled flue 1 (inert gas purging can reduce the temperature of the smoke), and can also purge the dust adhering to the inner wall of the dust removal, cooling, purification equipment and pipeline in the present invention; when T1<T2, the first control valve 16 can be closed, and the input of nitrogen into the dust removal, cooling, purification system of the present invention can be stopped, thereby reducing the cost investment of the enterprise.

[0026] Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the device also includes a nitrogen generator 19 , the top inlet of the nitrogen generator 19 is fixedly connected to an air pipeline 20 , and the outlet of the nitrogen generator 19 and the top inlet of the nitrogen buffer tank 5 are fixedly connected to a nitrogen delivery pipeline 21 .

[0027] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the filtering device includes a first filter 22, a second filter 23, and a third filter 24. A fourth exhaust pipeline 10 is fixedly connected between the top outlet of the second sedimentation bin 4 and the lower inlet of the first filter 22, a fifth exhaust pipeline 11 is fixedly connected between the top outlet of the first filter 22 and the venting pipeline 6, a sixth exhaust pipeline 25 is fixedly connected between the fourth exhaust pipeline 10 and the lower inlet of the second filter 23, a seventh exhaust pipeline 26 is fixedly connected between the sixth exhaust pipeline 25 and the lower inlet of the third filter 24, an eighth exhaust pipeline 27 is fixedly connected between the top outlet of the second filter 23 and the fifth exhaust pipeline 11 between the top outlet of the first filter 22 and the exhaust gas return pipeline 12, and a ninth exhaust pipeline 28 is fixedly connected between the top outlet of the third filter 24 and the fifth exhaust pipeline 11 between the eighth exhaust pipeline 27 and the exhaust gas return pipeline 12.

[0028] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a second nitrogen pipeline 29 is fixedly connected between the first nitrogen pipeline 13 and the tail gas reflux pipeline 12 between the fifth tail gas pipeline 11 and the first nitrogen pipeline 13, and a second pressure gauge 30, a second flow meter 31, and a second control valve 32 are fixedly installed on the second nitrogen pipeline 29 in sequence along the flow direction of the medium.

[0029] As required, nitrogen can be introduced into the inlet and outlet of the tail gas reflux pipeline 12 through the first nitrogen pipeline 13 and the second nitrogen pipeline 29 respectively, which has a better purging and cooling effect on various equipment and pipelines in the present invention.

[0030] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a third control valve 33 is fixedly installed on the fifth tail gas pipeline 11 between the tail gas return pipeline 12 and the venting pipeline 6 .

[0031] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a fourth control valve 34 is fixedly installed on the tail gas return line 12 between the fifth tail gas line 11 and the second nitrogen line 29 , and a fifth control valve 35 is fixedly installed on the tail gas return line 12 between the second nitrogen line 29 and the first nitrogen line 13 .

[0032] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figure 1As shown, the device also includes a calcium carbide furnace 36, the bottom inlet of the water-cooled flue 1 is fixedly connected to the top outlet of the calcium carbide furnace 36, a third pressure gauge 37 is fixedly arranged on the calcium carbide furnace 36, a sixth control valve 38 is fixedly installed on the vent line 6, the second inlet at the lower part of the air-cooling chamber 3 is fixedly connected to the cold air input pipeline 39, and an air cooler 40 is fixedly installed on the inlet of the cold air input pipeline 39.

[0033] As needed, a control valve and a pressure gauge can be fixedly installed on the first exhaust pipeline 7 between the lower outlet of the water-cooled flue 1 and the first thermometer 17. The control valve and the pressure gauge can be electrically connected to the controller. The third pressure gauge 37 collects the real-time furnace pressure value of the calcium carbide furnace 36. When the real-time furnace pressure value exceeds the maximum working pressure of the calcium carbide furnace 36, the controller maintains the real-time furnace pressure of the calcium carbide furnace 36 within a safe working pressure range by adjusting the opening of the control valve on the first exhaust pipeline 7.

[0034] Embodiment 8: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a first delivery pump 41 is fixedly installed on the fourth tail gas pipeline 10 between the top outlet of the second settling bin 4 and the sixth tail gas pipeline 25 , and a second delivery pump 42 is fixedly installed on the fifth tail gas pipeline 11 between the ninth tail gas pipeline 28 and the tail gas return pipeline 12 .

[0035] Embodiment 9: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the second pressure gauge 30, the second flow meter 31, the second control valve 32, the third control valve 33, the fourth control valve 34, the fifth control valve 35, the air cooler 40, the first delivery pump 41, and the second delivery pump 42 are all electrically connected to the controller.

[0036] According to the needs, the pipelines and equipment of the thermostatic control device for tail gas purification of calcium carbide furnace can also be equipped with conventional valves, thermometers and pressure gauges known in the art according to production needs. The controller is a DCS controller, and the model of the DCS control can be the CS3000 controller produced by Yokogawa Corporation of Japan.

[0037] Embodiment 10: As attached Figure 1 As shown, the control method of the thermostatic control device for purifying tail gas of calcium carbide furnace comprises: In the first step, the smoke dust (exhaust gas discharged from the calcium carbide furnace 36) enters the water-cooled flue 1 for cooling, and then enters the first settling bin 2 through the first exhaust pipeline 7 for the first dust removal; In the second step, the smoke dust after the first dust removal enters the air cooling bin 3 through the second tail gas pipeline 8 for cooling, and the cooled smoke dust enters the second settling bin 4 through the third tail gas pipeline 9 for the second dust removal; In the third step, the smoke after the second dust removal enters the filtering device (first filter 22, second filter 23, third filter 24) through the fourth tail gas pipeline 10 for purification, and the purified smoke returns to the first tail gas pipeline 7 through the tail gas return pipeline 12, forming a dust removal, cooling, and purification circulation system; In the fourth step, when the temperature of the smoke in the water-cooled flue 1 is too high, the nitrogen in the nitrogen buffer tank 5 enters the first tail gas pipeline 7 through the first nitrogen pipeline 13 and the tail gas return pipeline 12 in sequence, and purges and cools the smoke in the dust removal, cooling, and purification circulation system; In the fifth step, the smoke is returned to the vent line 6 through the fifth tail gas pipeline 11 after dust removal, cooling and purification, and discharged into the atmosphere.

[0038] The present invention has the following beneficial effects: (1) The present invention effectively solves the problem of dust sticking to the inner wall of the calcium carbide furnace tail gas, such as dust removal, cooling, purification equipment and pipelines, caused by excessive temperature fluctuation of the calcium carbide furnace tail gas, reduces the workload of manual decoking, and improves the purification effect of the calcium carbide furnace tail gas; (2) The present invention can reduce the failure rate of calcium carbide furnace tail gas dust removal, cooling and purification equipment (the high temperature of calcium carbide furnace tail gas will cause damage to the bag filter in the dust removal equipment and damage to the air cooler due to high load operation), thereby improving the safety production rate of the enterprise; (3) The present invention monitors the temperature fluctuation of the calcium carbide furnace tail gas in real time and accurately controls the nitrogen input, thereby reducing the cost investment of the enterprise.

[0039] In summary, the present invention can effectively reduce the temperature of the tail gas from the calcium carbide furnace, improve the purification effect of the tail gas from the calcium carbide furnace, and also improve the safe operation rate of the tail gas purification equipment from the calcium carbide furnace.

[0040] The above technical features respectively constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A constant temperature control device for purifying tail gas from a calcium carbide furnace, characterized in that It includes a water-cooled flue, a first sedimentation bin, an air-cooled bin, a second sedimentation bin, a filtering device, a nitrogen buffer tank, and a controller. The top outlet of the water-cooled flue is fixedly connected with a venting pipeline, the lower outlet of the water-cooled flue and the lower inlet of the first sedimentation bin are fixedly connected with a first tail gas pipeline, the top outlet of the first sedimentation bin and the first lower inlet of the air-cooled bin are fixedly connected with a second tail gas pipeline, the top outlet of the air-cooled bin and the lower inlet of the second sedimentation bin are fixedly connected with a third tail gas pipeline, the top outlet of the second sedimentation bin and the lower inlet of the filtering device are fixedly connected with a fourth tail gas pipeline, the top outlet of the filtering device and the venting pipeline are fixedly connected with a fifth tail gas pipeline, the fifth tail gas pipeline and the first tail gas pipeline are fixedly connected with a tail gas reflux pipeline, and the bottom outlet of the nitrogen buffer tank and the tail gas reflux pipeline are fixedly connected with a first nitrogen pipeline.

2. The constant temperature control device for purifying tail gas from calcium carbide furnace according to claim 1 is characterized in that A first pressure gauge, a first flow meter and a first control valve are fixedly installed on the first nitrogen pipeline along the medium flow direction, a first thermometer is fixedly installed on the first exhaust pipeline between the lower outlet of the water-cooled flue and the exhaust gas return pipeline, and a second thermometer is fixedly installed on the first exhaust pipeline between the exhaust gas return pipeline and the lower inlet of the first settling bin, and the first pressure gauge, the first flow meter, the first control valve, the first thermometer and the second thermometer are all electrically connected to the controller.

3. The constant temperature control device for purifying tail gas from a calcium carbide furnace according to claim 1 or 2, characterized in that The invention also comprises a nitrogen making device, wherein the top inlet of the nitrogen making device is fixedly connected with an air pipeline, and the outlet of the nitrogen making device and the top inlet of the nitrogen buffer tank are fixedly connected with a nitrogen delivery pipeline.

4. The constant temperature control device for purifying tail gas from a calcium carbide furnace according to claim 1, 2 or 3, characterized in that The filtering device includes a first filter, a second filter, and a third filter. A fourth exhaust pipeline is fixedly connected between the top outlet of the second sedimentation bin and the lower inlet of the first filter, a fifth exhaust pipeline is fixedly connected between the top outlet of the first filter and the venting pipeline, a sixth exhaust pipeline is fixedly connected between the fourth exhaust pipeline and the lower inlet of the second filter, a seventh exhaust pipeline is fixedly connected between the sixth exhaust pipeline and the lower inlet of the third filter, an eighth exhaust pipeline is fixedly connected between the top outlet of the second filter and the fifth exhaust pipeline between the top outlet of the first filter and the exhaust gas reflux pipeline, and a ninth exhaust pipeline is fixedly connected between the top outlet of the third filter and the fifth exhaust pipeline between the eighth exhaust pipeline and the exhaust reflux pipeline.

5. The constant temperature control device for purifying tail gas from calcium carbide furnace according to claim 4 is characterized in that A second nitrogen pipeline is fixedly connected between the first nitrogen pipeline and the tail gas reflux pipeline between the fifth tail gas pipeline and the first nitrogen pipeline. A second pressure gauge, a second flow meter and a second control valve are fixedly installed in sequence on the second nitrogen pipeline along the medium flow direction.

6. The constant temperature control device for purifying tail gas from a calcium carbide furnace according to claim 5, characterized in that A third control valve is fixedly installed on the fifth tail gas pipeline between the tail gas reflux pipeline and the vent pipeline, a fourth control valve is fixedly installed on the tail gas reflux pipeline between the fifth tail gas pipeline and the second nitrogen pipeline, and a fifth control valve is fixedly installed on the tail gas reflux pipeline between the second nitrogen pipeline and the first nitrogen pipeline.

7. The constant temperature control device for purifying tail gas from a calcium carbide furnace according to any one of claims 1 to 6, characterized in that It also includes a calcium carbide furnace, the bottom inlet of the water-cooled flue is fixedly connected to the top outlet of the calcium carbide furnace, a third pressure gauge is fixedly installed on the calcium carbide furnace, a sixth control valve is fixedly installed on the vent pipeline, the second inlet at the lower part of the air-cooling warehouse is fixedly connected to the cold air input pipeline, and an air cooler is fixedly installed on the inlet of the cold air input pipeline.

8. The constant temperature control device for purifying tail gas from a calcium carbide furnace according to claim 7, characterized in that A first delivery pump is fixedly installed on the fourth tail gas pipeline between the top outlet of the second settling bin and the sixth tail gas pipeline, and a second delivery pump is fixedly installed on the fifth tail gas pipeline between the ninth tail gas pipeline and the tail gas return pipeline.

9. The constant temperature control device for purifying tail gas from calcium carbide furnace according to claim 8, characterized in that The second pressure gauge, the second flow meter, the second control valve, the third control valve, the fourth control valve, the fifth control valve, the air cooler, the first delivery pump, and the second delivery pump are all electrically connected to the controller.

10. A constant temperature control method for purifying tail gas from a calcium carbide furnace according to the device of any one of claims 1 to 9, characterized in that include: In the first step, the smoke discharged from the calcium carbide furnace enters the water-cooled flue for cooling, and then enters the first settling bin through the first tail gas pipeline for the first dust removal; In the second step, the smoke dust after the first dust removal enters the air cooling bin through the second tail gas pipeline for cooling, and the cooled smoke dust enters the second settling bin through the third tail gas pipeline for the second dust removal; In the third step, the smoke dust after the second dust removal enters the filtering device through the fourth tail gas pipeline for purification, and the purified smoke dust returns to the first tail gas pipeline through the tail gas return pipeline, forming a dust removal, cooling, and purification circulation system; In the fourth step, when the temperature of the smoke in the water-cooled flue is too high, the nitrogen in the nitrogen buffer tank enters the first tail gas pipeline through the first nitrogen pipeline and the tail gas return pipeline in sequence, and purges and cools the smoke in the dust removal, cooling, and purification circulation system; In the fifth step, the smoke is returned to the vent pipeline through the fifth tail gas pipeline after dust removal, cooling and purification, and discharged into the atmosphere.

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