Calcium carbide furnace detection device
By using high-purity nitrogen obtained from the purification of calcium carbide furnace tail gas to backflush the sampling tube, the problem of pipeline blockage in furnace pressure testing was solved, resulting in cost reduction and improved data accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANCHEN CHEM
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-19
AI Technical Summary
In existing calcium carbide furnace pressure testing, the furnace pressure tapping pipeline is prone to blockage, resulting in inaccurate test data. Frequent manual cleaning is required, increasing costs and posing safety hazards.
The exhaust gas from the calcium carbide furnace production process is purified to obtain high-purity nitrogen, which is used to backflush the sampling tube to prevent blockage and ensure the authenticity of the furnace pressure test data.
It reduced production costs, decreased environmental pollution, enabled resource recycling, and ensured the accuracy of furnace pressure testing data.
Smart Images
Figure CN224262254U_ABST
Abstract
Description
Technical Field
[0001] This solution belongs to the field of furnace pressure control technology, specifically involving a calcium carbide furnace detection device. Background Technology
[0002] Referring to the existing public (announcement) technology CN207386088U, calcium carbide furnace pressure detection technology can effectively reflect the furnace condition in real time, guiding process personnel in the operation and control of the calcium carbide furnace. Excessive or insufficient furnace pressure is undesirable. Excessive pressure, forming a positive pressure, will cause CO leakage, leading to flames erupting from the furnace cover, potentially causing hoses and other equipment to burn out, as well as personnel poisoning. Conversely, insufficient pressure, forming a negative pressure, can easily cause the material surface temperature to rise, increasing branch current and causing the electrodes to rise, resulting in a deterioration of the furnace condition.
[0003] Furnace pressure monitoring technology typically uses differential pressure transmitters to reflect the pressure inside the furnace. When the furnace pressure tapping line is blocked, the value measured by the transmitter will be too low, leading to incorrect operation by the operator. To ensure the accuracy of the detected furnace pressure data, the furnace pressure line needs to be frequently purged to ensure its unobstructed flow and accurate, real-time readings. Currently, blockages in the furnace pressure tapping line are common in the calcium carbide furnace industry, causing problems with the accuracy of the detected data and necessitating frequent manual valve opening and purging of the tapping line as needed.
[0004] See the existing publication (announcement) number CN207386088U for an automatic backflushing device for a calcium carbide furnace pressure pipeline, which includes: a gas supply valve, a pressure measuring device, a safety valve, a first automatic control valve, and a controller; the input end of the gas supply valve is connected to a gas source, one end of the first automatic control valve is connected to the output end of the gas supply valve and one end of the safety valve, the other end of the first automatic control valve is connected to a first sampling point, the other end of the safety valve is connected to the pressure measuring device, and the first automatic control valve, the gas supply valve, and the safety valve are all connected to the controller.
[0005] The aforementioned backflushing device for the calcium carbide furnace pipeline uses an air supply valve and a first automatic control valve to purge the pressure testing pipeline with an air source. However, the air source used for this backflushing does not utilize the exhaust gas purified during the calcium carbide furnace production process, and using an additional air source would increase costs. Utility Model Content
[0006] The purpose of this solution is to provide a calcium carbide furnace detection device that uses the exhaust gas from the calcium carbide furnace to backflush the sampling tube.
[0007] To achieve the above objectives, this solution provides a calcium carbide furnace detection device, including a calcium carbide furnace and a detection component for detecting the furnace pressure; characterized in that it further includes a cyclone separator, a furnace gas cooler, a bag filter, a wet desulfurization tower, an SCR reactor, a heat exchanger, an amine liquid absorption tower, a catalytic oxidation reactor, a molecular sieve adsorption tower, a compressor, a cryogenic air separation unit, and a nitrogen storage tank connected sequentially by pipelines; the nitrogen storage tank is connected to the detection component through a backflushing pipeline.
[0008] The principle of this scheme is as follows: The exhaust gas generated during the calcium carbide furnace production process is purified through a series of interconnected devices, including a cyclone separator, furnace gas cooler, bag filter, wet desulfurization tower, SCR reactor, heat exchanger, amine absorption tower, catalytic oxidation reactor, molecular sieve adsorption tower, compressor, cryogenic air separation unit, and nitrogen storage tank. In these devices, impurities and harmful components in the exhaust gas are gradually removed, ultimately yielding high-purity nitrogen, which is stored in the nitrogen storage tank. The nitrogen in the storage tank is then connected to the detection component via a backflush pipe. The nitrogen is used to purge the backflush pipe, preventing blockage of the pipeline connecting the detection component to the calcium carbide furnace and ensuring the accuracy of the furnace pressure detection data.
[0009] The benefits of this solution are as follows: since nitrogen is a byproduct of the calcium carbide furnace production process, its purification and use for backflushing avoids the use of additional gas sources, reduces production costs, reduces environmental pollution, and achieves resource recycling.
[0010] Furthermore, the detection component includes a differential pressure transmitter and a sampling tube. The differential pressure transmitter is connected to the sampling tube, and the free end of the sampling tube is located inside the calcium carbide furnace. A first solenoid valve is provided on the sampling tube. The sampling tube is connected to a nitrogen storage tank through a backflush pipe, and a second solenoid valve is provided on the backflush pipe.
[0011] The principle and effect of this scheme are as follows: During normal testing, the first solenoid valve is open and the second solenoid valve is closed. The differential pressure transmitter obtains a gas sample from inside the calcium carbide furnace through the sampling tube, thereby detecting the furnace pressure. When backflushing is required, the first solenoid valve is closed and the second solenoid valve is opened. Nitrogen gas from the nitrogen storage tank enters the sampling tube through the backflushing pipe. The high-speed flow of nitrogen gas blows away impurities adhering to the inner wall of the sampling tube, preventing blockage of the pressure tapping line and ensuring the authenticity of the furnace pressure detection data.
[0012] Furthermore, the calcium carbide furnace is connected to the cyclone separator via a clean furnace gas pipeline, and both the feed end and discharge end of the clean furnace gas pipeline are equipped with water inlets and outlets; the discharge port of the cyclone separator is connected to the furnace gas cooler via a first pipeline, and the first pipeline is equipped with a sealing ball valve and a high-temperature expansion joint; the furnace gas cooler is connected to the bag filter via a second pipeline, and the second pipeline is equipped with a drain valve and a demister; the bag filter is connected to the wet desulfurization tower via a third pipeline, and the third pipeline is equipped with a pH meter.
[0013] The principle and effect of this scheme are as follows: By installing a clean furnace gas pipeline with inlet and outlet water between the calcium carbide furnace and the cyclone separator, the temperature of the calcium carbide furnace tail gas is regulated. Water circulation cooling is used to lower the tail gas temperature, bringing it to a suitable range for subsequent treatment. Next, the tail gas enters the furnace gas cooler through a first pipeline equipped with a sealing ball valve and a high-temperature expansion joint. The sealing ball valve ensures a tight seal during tail gas transport, preventing gas leakage; the high-temperature expansion joint prevents thermal expansion of the pipeline due to high temperatures. After cooling, the tail gas enters a bag filter through a second pipeline equipped with a drain valve and a demister. The drain valve discharges condensate generated in the pipeline, preventing moisture from affecting the operation of subsequent equipment; the demister removes mist droplets from the tail gas. Finally, the tail gas filtered by the bag filter enters a wet desulfurization tower through a third pipeline equipped with a pH meter, which monitors the acidity and alkalinity of the tail gas.
[0014] Furthermore, the wet desulfurization tower is connected to the SCR reactor via a fourth pipe, which is equipped with a demister; the SCR reactor is connected to the heat exchanger via a fifth pipe, which is equipped with a bypass valve and a temperature control valve; and the heat exchanger is connected to the amine absorption tower via a sixth pipe, which is equipped with a level gauge for measuring the amine circulation volume.
[0015] The principle and effect of this scheme are as follows: A fourth pipeline is installed between the wet desulfurization tower and the SCR reactor, and a demister is installed on this pipeline to remove mist droplets from the exhaust gas, preventing them from affecting downstream equipment. Next, the exhaust gas enters the SCR reactor through a fifth pipeline, where, under the action of the catalyst, NOx is converted into harmless nitrogen and water, achieving denitrification. The fifth pipeline is equipped with a bypass valve and a temperature control valve. The bypass valve can be used during system maintenance or failure, and the temperature control valve is used to control the temperature of the exhaust gas entering the SCR reactor. Subsequently, the denitrified exhaust gas enters the heat exchanger through a sixth pipeline for heat exchange, regulating the exhaust gas temperature to conditions suitable for amine absorption. A level gauge is installed on the sixth pipeline to measure the amine circulation volume, ensuring stable amine circulation within the absorption tower.
[0016] Furthermore, the amine absorption tower and the catalytic oxidation reactor are connected via a seventh pipe, which is equipped with a flame arrester and a VOC concentration detector; the molecular sieve adsorption tower and the compressor are connected via an eighth pipe, which is equipped with a filter and a silencer; the cryogenic air separation unit and the nitrogen storage tank are connected via a ninth pipe, which is equipped with a cryogenic valve, a pressure relief valve and a dew point meter.
[0017] The principle and effect of this scheme are as follows: By setting up a seventh pipeline between the amine absorption tower and the catalytic oxidation reactor, and installing a flame arrester and a VOC concentration detector on this pipeline, the flame arrester can prevent fire accidents, and the VOC concentration detector is used to monitor the VOC concentration in the exhaust gas, ensuring the efficient conduct of the catalytic oxidation reaction. Next, after the exhaust gas is adsorbed by a molecular sieve adsorption tower, it enters the compressor through an eighth pipeline. This pipeline is equipped with a filter and a silencer. The filter removes small particles from the exhaust gas, and the silencer reduces system noise, protecting the environment. Finally, the exhaust gas, after being treated by the cryogenic air separation unit, enters the nitrogen storage tank through a ninth pipeline. This pipeline is equipped with a cryogenic valve, a pressure relief valve, and a dew point meter. The cryogenic valve adapts to the low-temperature environment, the pressure relief valve prevents excessive pressure, and the dew point meter monitors the moisture content in the exhaust gas, ensuring the purity of the nitrogen.
[0018] Furthermore, a piston is provided inside the nitrogen storage tank, and the piston is slidably connected to the inner wall of the nitrogen storage tank. The piston is connected to a drive unit for driving the piston.
[0019] The principle and effect of this solution are as follows: During normal system operation, nitrogen is supplied to the nitrogen storage tank through the ninth pipe. However, after the system is completely shut down, residual nitrogen remains in the ninth pipe, which is prone to mixing with other gases. Upon restarting the equipment, this residual nitrogen is then sent into the nitrogen storage tank. Therefore, it is necessary to ensure that nitrogen from the ninth pipe can still be drawn into the nitrogen storage tank after the equipment stops. This solution uses a drive unit to move the piston towards the bottom of the nitrogen storage tank, increasing its volume and creating negative pressure. This draws nitrogen from the ninth pipe into the storage tank. During normal backflushing, the drive unit moves the piston towards the top of the nitrogen storage tank, reducing the volume of the chamber between the piston and the tank. Positive pressure is used to send nitrogen through the backflushing pipe into the sampling tube, thus backflushing the tube and preventing blockage and deposition.
[0020] Furthermore, the driving unit is a cylinder, and the piston rod of the cylinder is fixedly connected to the piston.
[0021] The principle and effect of this scheme are as follows: the piston rod of the cylinder extends and retracts, thereby driving the piston of the nitrogen storage tank to extend and retract, so that the nitrogen storage tank generates positive pressure when the system is running normally, and generates negative pressure to absorb nitrogen in the ninth pipeline after the system is shut down.
[0022] Furthermore, the driving unit includes an electromagnet and a permanent magnet. The electromagnet is located at the bottom of the nitrogen storage tank, and the permanent magnet is located inside the piston. The electromagnet and the permanent magnet are configured in conjunction. The piston is connected to a spring, and the free end of the spring is fixedly connected to the bottom of the nitrogen storage tank.
[0023] The principle and effect of this solution are as follows: After the entire system is shut down, impurities will remain in the sampling tube, forming blockages. Continuing to run the system and backflushing the sampling tube would increase the operating costs of other equipment. Therefore, this solution requires backflushing the sampling tube separately after the entire system is shut down. During normal system operation, an electromagnet, when energized, attracts a permanent magnet, generating a force that moves the permanent magnet to the bottom of the nitrogen storage tank and compresses the spring. When backflushing the sampling tube is needed, the second solenoid valve is opened, allowing nitrogen from the nitrogen storage tank to enter the sampling tube through the backflushing pipe, thus backflushing the tube. After the system shuts down, the permanent magnet loses the attraction of the electromagnet and, driven by the spring preload, drives the piston towards the top of the nitrogen storage tank, creating positive pressure inside the tank and forcing nitrogen into the backflushing pipe, thus continuing to backflush the sampling tube even after the system shuts down.
[0024] Furthermore, the ninth pipeline is equipped with a check valve and a pressure relief valve.
[0025] The principle and effect of this solution are as follows: the one-way valve prevents nitrogen backflow, ensuring that the nitrogen in the ninth pipeline can only enter the nitrogen storage tank; since the ninth pipeline is constantly supplying nitrogen to the nitrogen storage tank, a pressure relief valve is installed to protect the nitrogen storage tank from excessive pressure.
[0026] Furthermore, a one-way valve is provided on the backflush pipe.
[0027] The principle and effect of this scheme is that the gas in the nitrogen storage tank can only enter the backflush pipe in one direction. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the structure of a calcium carbide furnace detection device according to the present invention;
[0029] Figure 2 This is a schematic diagram of the internal structure of the nitrogen storage tank of this utility model.
[0030] The corresponding labels in the attached diagram are as follows: 1. Calcium carbide furnace; 2. Detection component; 21. Differential pressure transmitter; 22. Sampling tube; 3. Cyclone separator; 4. Furnace gas cooler; 5. Bag filter; 6. Wet desulfurization tower; 7. SCR reactor; 8. Heat exchanger; 9. Nitrogen storage tank; 91. Backflush pipe; 92. Pipeline; 93. Electromagnet; 94. Permanent magnet; 95. Spring; 96. Ninth pipe; 10. Clean furnace gas pipe; 11. Cryogenic air separation unit; 12. Amine liquid absorption tower. Detailed Implementation
[0031] The following will describe the concept and technical effects of this utility model clearly and completely with reference to the embodiments, so as to fully understand the purpose, features and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model.
[0032] Example 1:
[0033] Please see Figure 1 A calcium carbide furnace detection device includes a calcium carbide furnace 1 and a detection component 2 for detecting the furnace pressure of the calcium carbide furnace 1. The detection component 2 includes a differential pressure transmitter 21 and a sampling tube 22. The differential pressure transmitter 21 is connected to the sampling tube 22. The free end of the sampling tube 22 is located inside the furnace body of the calcium carbide furnace 1. A first solenoid valve is provided on the sampling tube 22. The sampling tube 22 is connected to a nitrogen storage tank 9 through a backflush pipe 91. A second solenoid valve is provided on the backflush pipe 91. During normal detection, the first solenoid valve is open and the second solenoid valve is closed. The differential pressure transmitter 21 obtains a gas sample from inside the calcium carbide furnace 1 through the sampling tube 22, thereby detecting the furnace pressure. When backflush is required, the first solenoid valve is closed and the second solenoid valve is opened. Nitrogen gas from the nitrogen storage tank 9 enters the sampling tube 22 through the backflush pipe 91. The high-speed flow of nitrogen gas blows away impurities adhering to the inner wall of the sampling pipe 91, preventing blockage of the pressure line and ensuring the authenticity of the furnace pressure detection data.
[0034] Please continue reading. Figure 1The calcium carbide furnace 1 is connected to the cyclone separator via a clean furnace gas pipeline 10. Both the feed and discharge ends of the clean furnace gas pipeline 10 are equipped with water inlets and outlets to regulate the temperature of the calcium carbide furnace exhaust gas. Water circulation is used to cool and reduce the exhaust gas temperature, bringing it to a suitable range for subsequent processing. The discharge port of the cyclone separator 3 is connected to the furnace gas cooler 4 via a first pipeline. The first pipeline is equipped with a sealing ball valve and a high-temperature expansion joint. The sealing ball valve ensures a tight seal during exhaust gas transport, preventing gas leakage. The high-temperature expansion joint prevents thermal expansion of the pipeline due to high temperatures. The furnace gas cooler 4 is connected to the bag filter 5 via a second pipeline. The second pipeline is equipped with a drain valve and a demister. The drain valve discharges condensate generated in the pipeline, preventing moisture from affecting the operation of subsequent equipment. The demister removes mist droplets from the exhaust gas. The bag filter 5 is connected to the wet desulfurization tower 6 via a third pipeline. The third pipeline is equipped with a pH meter to monitor the acidity and alkalinity of the exhaust gas. The wet desulfurization tower 6 is connected to the SCR reactor 7 via a fourth pipe, which is equipped with a demister to remove mist droplets from the exhaust gas. The SCR reactor 7 is connected to the heat exchanger 8 via a fifth pipe, which is equipped with a bypass valve and a temperature control valve. The bypass valve can be used during system maintenance or failure, and the temperature control valve is used to control the temperature of the exhaust gas entering the SCR reactor. The heat exchanger 8 is connected to the amine absorption tower 12 via a sixth pipe, which is equipped with a level gauge to measure the amine circulation volume. The amine absorption tower 12 is connected to the catalytic oxidation reactor via a seventh pipe, which is equipped with a flame arrester and a VOC concentration detector. The flame arrester prevents fires, and the VOC concentration detector monitors the VOC concentration in the exhaust gas to ensure the efficient catalytic oxidation reaction. The sieve adsorption tower is connected to the compressor via an eighth pipe, which is equipped with a filter and a silencer. The filter removes small particles from the exhaust gas, and the silencer reduces system noise and protects the environment. The cryogenic air separation unit 11 is connected to the nitrogen storage tank 9 via a ninth pipe 96, which is equipped with a cryogenic valve, a pressure relief valve, and a dew point meter. The cryogenic valve adapts to the low-temperature environment, the pressure relief valve prevents excessive pressure, and the dew point meter monitors the moisture content in the exhaust gas to ensure the purity of the nitrogen. The ninth pipe 96 is also equipped with a one-way valve, which ensures that the nitrogen in the nitrogen storage tank 9 can only be discharged through the ninth pipe 96.
[0035] Example 2:
[0036] The differences between this embodiment and the previous embodiment are as follows:
[0037] Please see Figure 2A piston 92 is installed inside the nitrogen storage tank 9. The piston 92 is slidably connected to the inner wall of the nitrogen storage tank 9. The piston 92 is connected to a drive unit for driving the piston 92. The drive unit is a cylinder (not shown in the figure), and the piston rod of the cylinder is fixedly connected to the piston 92. During normal system operation, nitrogen is supplied to the nitrogen storage tank 9 through the ninth pipe. However, when the system is completely stopped, nitrogen will remain in the ninth pipe 96. This residual nitrogen is prone to mixing with other gases. After the equipment is restarted, the gas will be sent into the nitrogen storage tank 9. Therefore, it is necessary to be able to draw the nitrogen in the ninth pipe 96 into the nitrogen storage tank 9 after the equipment is shut down. This solution uses the retraction of the piston rod of the cylinder to drive the piston 92 to move towards the bottom of the nitrogen storage tank 9, thereby increasing the volume of the nitrogen storage tank 9 and creating a negative pressure inside the nitrogen storage tank 9, thereby drawing the nitrogen in the ninth pipe 96 into the nitrogen storage tank 9. During normal backflushing, the piston rod of the cylinder extends and drives the piston 92 to move towards the top of the nitrogen storage tank 9, thereby reducing the volume of the chamber between the piston 92 and the nitrogen storage tank 9. The positive pressure is used to send nitrogen through the backflushing pipe 91 into the sampling tube 22, thereby backflushing the sampling tube 22 and preventing blockage and deposition inside the sampling tube 22.
[0038] Example 3:
[0039] The differences between this embodiment and the previous embodiment are as follows:
[0040] Please see Figure 2 A piston 92 is installed inside the nitrogen storage tank 9, and the piston 92 is slidably connected to the inner wall of the nitrogen storage tank 9. The piston 92 is connected to a drive unit for driving the piston 92. The drive unit includes an electromagnet 93 and a permanent magnet 94. The electromagnet 93 is located at the bottom of the nitrogen storage tank 9, and the permanent magnet 94 is located inside the piston 92. The electromagnet 93 and the permanent magnet 94 are configured to cooperate. The piston 92 is connected to a spring 95, and the free end of the spring 95 is fixedly connected to the bottom of the nitrogen storage tank 9. After the entire system is shut down, impurities will still remain in the sampling tube 22, forming a blockage. If the system continues to run to backflush the sampling tube 22, it will increase the operating cost of other equipment. Therefore, this solution requires backflushing the sampling tube 22 separately after the entire system is shut down. During normal system operation, the electromagnet 93 is energized and attracts the permanent magnet 94, generating a suction force that attracts the permanent magnet 94 to the bottom of the nitrogen storage tank 9 and compresses the spring 95. When backflushing of sampling tube 22 is required, the second solenoid valve is opened, allowing nitrogen from nitrogen storage tank 9 to enter sampling tube 22 through backflushing pipe 91, thereby backflushing sampling tube 22. After the system stops, permanent magnet 94 loses the attraction of electromagnet 93 and, driven by the preload of spring 95, drives piston 92 to move towards the top of nitrogen storage tank 9, thereby creating positive pressure inside nitrogen storage tank 9, squeezing nitrogen into backflushing pipe 91, and thus continuing to backflush sampling tube 22 even after the system stops.
[0041] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A calcium carbide furnace detection device, comprising a calcium carbide furnace (1) and a detection component (2) for detecting the furnace pressure of the calcium carbide furnace (1); characterized in that, It also includes a cyclone separator (3), a furnace gas cooler (4), a bag filter (5), a wet desulfurization tower (6), an SCR reactor (7), a heat exchanger (8), an amine absorption tower (12), a catalytic oxidation reactor, a molecular sieve adsorption tower, a compressor, a cryogenic air separation unit (11), and a nitrogen storage tank (9) connected in sequence by pipelines; the nitrogen storage tank (9) is connected to the detection component (2) through a backflush pipe (91).
2. The calcium carbide furnace detection device according to claim 1, characterized in that: The detection component (2) includes a differential pressure transmitter (21) and a sampling tube (22). The differential pressure transmitter (21) is connected to the sampling tube (22). The free end of the sampling tube (22) is located in the furnace body of the calcium carbide furnace (1). A first solenoid valve is provided on the sampling tube (22). The sampling tube (22) is connected to the nitrogen storage tank (9) through a backflush pipe (91). A second solenoid valve is provided on the backflush pipe (91).
3. The calcium carbide furnace detection device according to claim 2, characterized in that: The calcium carbide furnace (1) is connected to the cyclone separator through a clean furnace gas pipeline (10). The feed end and discharge end of the clean furnace gas pipeline (10) are equipped with water inlets and outlets. The discharge port of the cyclone separator (3) is connected to the furnace gas cooler (4) through a first pipeline. The first pipeline is equipped with a sealing ball valve and a high-temperature expansion joint. The furnace gas cooler (4) is connected to the bag filter (5) through a second pipeline. The second pipeline is equipped with a drain valve and a demister. The bag filter (5) is connected to the wet desulfurization tower (6) through a third pipeline. The third pipeline is equipped with a pH meter.
4. The calcium carbide furnace detection device according to claim 3, characterized in that: The wet desulfurization tower (6) is connected to the SCR reactor (7) through a fourth pipe, and a demister is provided on the fourth pipe; the SCR reactor (7) is connected to the heat exchanger (8) through a fifth pipe, and a bypass valve and a temperature control valve are provided on the fifth pipe; the heat exchanger (8) is connected to the amine absorption tower (12) through a sixth pipe, and a level gauge for measuring the amine circulation volume is provided on the sixth pipe.
5. The calcium carbide furnace detection device according to claim 4, characterized in that: The amine absorption tower (12) is connected to the catalytic oxidation reactor via a seventh pipe, which is equipped with a flame arrester and a VOC concentration detector; the molecular sieve adsorption tower is connected to the compressor via an eighth pipe, which is equipped with a filter and a silencer; the cryogenic air separation unit (11) is connected to the nitrogen storage tank (9) via a ninth pipe (96), which is equipped with a cryogenic valve, a pressure relief valve and a dew point meter.
6. The calcium carbide furnace detection device according to claim 5, characterized in that: The nitrogen storage tank (9) is equipped with a piston (92), which is slidably connected to the inner wall of the nitrogen storage tank (9). The piston (92) is connected to a drive unit for driving the piston (92).
7. The calcium carbide furnace detection device according to claim 6, characterized in that: The driving unit is a cylinder, and the piston rod of the cylinder is fixedly connected to the piston (92).
8. The calcium carbide furnace detection device according to claim 6, characterized in that: The drive unit includes an electromagnet (93) and a permanent magnet (94). The electromagnet (93) is located at the bottom of the nitrogen storage tank (9), and the permanent magnet (94) is located inside the piston (92). The electromagnet (93) and the permanent magnet (94) are configured in cooperation. The piston (92) is connected to a spring (95), and the free end of the spring (95) is fixedly connected to the bottom of the nitrogen storage tank (9).
9. The calcium carbide furnace detection device according to claim 8, characterized in that: The ninth pipeline (96) is equipped with a check valve and a pressure relief valve.
10. A calcium carbide furnace detection device according to claim 8, characterized in that: The backflush pipe (91) is equipped with a one-way valve.