A safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride.

Abstract

This utility model discloses a safety protection device for a hydrochloric acid storage tank, a byproduct of vinyl chloride production via the calcium carbide process. Belonging to the field of vinyl chloride production technology, it addresses the problems of poor safety and ineffective recovery of vinyl chloride gas from byproduct hydrochloric acid containing vinyl chloride monomer. The device is connected to the rear end of the hydrochloric acid storage tank, which is equipped with a nitrogen pipe and a regulating valve. The device comprises a primary alkali sealing tank, a secondary alkali sealing tank, and a vinyl chloride gas holder connected in sequence. The primary alkali sealing tank has a large-perforated plate in its lower part and a spray device one at its upper part. The secondary alkali sealing tank has a small-perforated plate in its lower part and a spray device two at its upper part. This utility model has a simple structure, can be directly installed after the hydrochloric acid storage tank, has low component costs, controllable technical modification costs, considerable profits, and guaranteed safety, making it worthy of promotion.

Description

Technical Field

[0001] This utility model belongs to the field of vinyl chloride production technology, specifically relating to a safety protection device for a hydrochloric acid storage tank, a byproduct of vinyl chloride production via the calcium carbide method. Background Technology

[0002] In the production process of vinyl chloride (VCM) using the calcium carbide method, the water-alkali washing step produces hydrochloric acid as a byproduct containing vinyl chloride monomer. During storage, due to the high volatility of vinyl chloride, this hydrochloric acid tends to accumulate at the top of the storage tank, forming an explosive gas mixture and posing a significant risk of fire and explosion.

[0003] The traditional method involves introducing nitrogen gas from the top of the storage tank to disperse vinyl chloride gas, but this method not only pollutes the environment but also harms the health of workers.

[0004] Therefore, there is an urgent need to develop a safety device that can automatically protect, monitor in real time, and has an alarm function to ensure the safety of the storage tank and its surrounding environment.

[0005] If we can separate vinyl chloride from hydrochloric acid gas on this basis, we can better recycle and utilize vinyl chloride, and generate new economic value.

[0006] Based on the problems mentioned above, researchers have proposed a safety protection device for hydrochloric acid storage tanks, a byproduct of the calcium carbide process for vinyl chloride. Utility Model Content

[0007] The purpose of this invention is to provide a safety protection device for a hydrochloric acid storage tank containing byproducts of vinyl chloride produced by the calcium carbide process, in order to solve the problems of poor safety of byproduct hydrochloric acid containing vinyl chloride monomer and the inability to effectively recover vinyl chloride gas.

[0008] To solve the above problems, the technical solution of this utility model is as follows: A safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride production, is provided. The device is connected to the rear end of the hydrochloric acid storage tank, which is equipped with a nitrogen pipe and a regulating valve. The device includes a primary alkali sealing tank, a secondary alkali sealing tank, and a vinyl chloride gas holder connected in sequence. The primary alkali sealing tank has a large perforated plate in its lower part and a spray device one in its upper part. The secondary alkali sealing tank has a small perforated plate in its lower part and a spray device two in its upper part.

[0009] Furthermore, the device also includes an interconnected alkali replenishment tank, an alkali pump, and a pure water tank. An alkali replenishment valve is installed on the connecting pipeline between the alkali replenishment tank and the alkali pump. The alkali pump is connected to spray device one and spray device two respectively, and a pure water valve is installed on the connecting pipeline between the alkali pump and the pure water tank. This alkali replenishment system provides alkali solution to the primary and secondary alkali sealing tanks. The alkali replenishment tank can be replenished with water from the pure water tank, and alkali can be added manually to prepare an alkali solution with a suitable pH. When needed, the alkali pump adds the solution to the primary and secondary alkali sealing tanks through spray devices one and two.

[0010] Furthermore, a pH meter is installed in the lower part of the primary alkali sealing tank, and a level gauge is installed in the upper part of the primary alkali sealing tank; a pH meter is installed in the lower part of the secondary alkali sealing tank, and a level gauge is installed in the upper part of the secondary alkali sealing tank. The pH meter monitors the pH of the alkali solution in the alkali sealing tank to determine the optimal time to replace the alkali solution; the level gauge monitors the liquid level of the alkali solution in the alkali sealing tank to ensure that the amount of alkali solution added is appropriate and not excessive.

[0011] Furthermore, spray device one is equipped with an alkali replenishment valve one at the pipe inlet, and a residual alkali valve one is equipped on the lower alkali discharge pipe of the primary alkali sealing tank; spray device two is equipped with an alkali replenishment valve two at the pipe inlet, and a residual alkali valve two is equipped on the lower alkali discharge pipe of the secondary alkali sealing tank. The separate installation of two sets of alkali replenishment valves and residual alkali valves facilitates separate alkali replenishment for spray device one and spray device two. When different alkali replenishment valves are open, alkali pump 7 can replenish alkali to different alkali sealing tanks.

[0012] Furthermore, a pH meter is installed on the connecting pipeline between the secondary alkali sealing tank and the vinyl chloride gas holder. This monitors whether the gas ultimately entering the vinyl chloride gas holder contains hydrochloric acid, serving as a final safety guarantee.

[0013] Furthermore, a gas path is provided on the main connecting pipeline between the alkali pump and spray device one and spray device two. This gas path is connected to the nitrogen pipeline, and a purge valve is installed on this gas path. This facilitates the purging and cleaning of the system pipelines and components during maintenance.

[0014] Furthermore, the device also includes an alkali system controller. The input terminals of the alkali system controller are connected to pH meter 1, level gauge 1, pH meter 2, level gauge 2, and pH meter 3, respectively. The output terminals of the alkali system controller are connected to alkali replenishment valve 1, alkali replenishment valve 2, residual alkali valve 1, residual alkali valve 2, alkali replenishment valve, alkali pump, pure water valve, and purge valve, respectively. This achieves automated control of the entire equipment.

[0015] Furthermore, the top of the hydrochloric acid storage tank is equipped with a vinyl chloride detector and a pressure transmitter; the vinyl chloride detector and pressure transmitter are connected to the input terminal of a safety system controller, which is connected to a regulating valve. This safety system comprehensively monitors the concentration of vinyl chloride gas and the pressure inside the hydrochloric acid storage tank. When the concentration exceeds the limit, the regulating valve can be automatically activated by the safety system controller, and nitrogen will begin to blow the mixed gas into the subsequent alkali sealing system.

[0016] Furthermore, a hydrochloric acid pipe is installed at the front end of the hydrochloric acid storage tank, and an acid valve is installed on the hydrochloric acid pipe. This allows for easy switching or shutting off of the hydrochloric acid pipeline into the hydrochloric acid storage tank in case of danger, eliminating the risk at its source.

[0017] The beneficial effects of this utility model are as follows: (1) This utility model achieves the absorption and neutralization of hydrochloric acid in vinyl chloride gas through a two-stage alkali seal, and finally collects the mixture of nitrogen and vinyl chloride in the vinyl chloride gas holder for subsequent recycling. The perforated plate in the alkali seal tank acts to block the upward movement of gas, prolonging the time the gas travels in the alkali solution, which facilitates better absorption of hydrochloric acid in the mixed gas by the alkali solution. The large perforated plate in the first-stage alkali seal tank has a larger pore diameter than the small perforated plate in the second-stage alkali seal tank because the mixed gas may contain pipeline impurities. The first-stage alkali seal tank contains relatively more impurities, and the large perforated plate prevents blockage. After some of the impurities settle in the first-stage alkali seal tank, there are relatively fewer small impurities entering the second-stage alkali seal tank, and the small perforated plate can better block the upward movement of gas. Through two-stage absorption, on the one hand, the hydrochloric acid in the mixed gas can be completely absorbed, and on the other hand, it is convenient to have a spare alkali seal tank when changing the alkali solution, which can ensure that the alkali absorption system always operates safely and stably.

[0018] (2) This utility model has a simple structure and can be directly installed after the hydrochloric acid storage tank. The cost of each component is low, the cost of technical transformation is controllable, the benefits are considerable, and the safety is guaranteed. It is worth promoting. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride.

[0020] The attached diagram is labeled as follows: 1-Hydrochloric acid pipe; 11-Acid valve; 2-Hydrochloric acid storage tank; 21-Nitrogen pipe; 22-Regulating valve; 23-Vinyl chloride detector; 24-Pressure transmitter; 25-Safety system controller; 3-Primary alkali seal tank; 31-Large orifice plate; 32-Spray device one; 33-pH meter one; 34-Level gauge one; 35-Alkali replenishment valve one; 36-Residual alkali valve one; 4-Secondary alkali seal tank; 41-Small orifice plate; 42-Spray device two; 43-pH meter two; 44-Level gauge two; 45-Alkali replenishment valve two; 46-Residual alkali valve two; 5-Vinyl chloride gas holder; 51-pH meter three; 6-Alkali replenishment tank; 61-Alkali replenishment valve; 7-Alkali pump; 8-Pure water tank; 81-Pure water valve; 9-Purge valve; 10-Alkali system controller. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0023] Example 1 like Figure 1 As shown, a safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride, is located at the rear end of the hydrochloric acid storage tank 2. The device includes a primary alkali sealing tank 3, a secondary alkali sealing tank 4, a vinyl chloride gas holder 5, a replenishment alkali tank 6, an alkali pump 7, a pure water tank 8, and an alkali system controller 10, all connected in sequence.

[0024] The front end of the hydrochloric acid storage tank 2 is connected to the hydrochloric acid pipe 1, and the hydrochloric acid pipe 1 is equipped with an acid valve 11.

[0025] The hydrochloric acid storage tank 2 is equipped with a nitrogen pipe 21, and a regulating valve 22 is installed on the nitrogen pipe 21. The top of the hydrochloric acid storage tank 2 is equipped with a vinyl chloride detector 23 and a pressure transmitter 24. The vinyl chloride detector 23 and the pressure transmitter 24 are connected to the input terminal of a safety system controller 25. The input terminal of the safety system controller 25 is connected to the regulating valve 22. The safety system controller 25 is a PLC controller used to monitor the concentration of vinyl chloride monomer in the hydrochloric acid storage tank 2 and to dynamically monitor the pressure of the entire storage tank.

[0026] The lower part of the primary alkali sealing tank 3 is equipped with a large orifice plate 31 and a pH meter 33. The upper part of the primary alkali sealing tank 3 is equipped with a spray device 32 and a level gauge 34. The spray device 32 is connected to the alkali replenishment tank 6 through the alkali pump 7. The inlet of the spray device 32 is equipped with an alkali replenishment valve 35. The lower alkali discharge pipe of the primary alkali sealing tank 3 is equipped with a residual alkali valve 36.

[0027] The lower part of the secondary alkali sealing tank 4 is equipped with a small orifice plate 41 and a pH meter 43. The upper part of the secondary alkali sealing tank 4 is equipped with a spray device 42 and a level gauge 44. The spray device 42 is connected to the alkali replenishment tank 6 through the alkali pump 7. The inlet of the spray device 42 is equipped with an alkali replenishment valve 45. The lower alkali discharge pipe of the secondary alkali sealing tank 4 is equipped with a residual alkali valve 46.

[0028] A pH meter 351 is installed on the connecting pipeline between the secondary alkali sealing tank 4 and the vinyl chloride gas holder 5.

[0029] An alkali replenishment valve 61 is installed on the connecting pipeline between the alkali replenishment tank 6 and the alkali pump 7.

[0030] A gas line is provided on the main connecting pipeline between the alkali pump 7 and the spray device 1 32 and the spray device 2 2, which is connected to the nitrogen pipe 21. A purge valve 9 is provided on this gas line.

[0031] A pure water valve 81 is installed on the connecting pipeline between the alkali pump 7 and the pure water tank 8; the pure water tank 8 is also connected to the alkali replenishment tank 6.

[0032] The alkali system controller 10 is a PLC controller. The input terminals of the alkali system controller 10 are connected to pH meter 33, level gauge 34, pH meter 43, level gauge 44, and pH meter 51, respectively. The output terminals of the alkali system controller 10 are connected to alkali replenishment valve 35, alkali replenishment valve 45, residual alkali valve 36, residual alkali valve 46, alkali replenishment valve 61, alkali pump 7, pure water valve 81, and purge valve 9, respectively.

[0033] The daily operation of this utility model can be divided into three aspects: gas path, alkali path, and automatic system control, which are described below: 1. Gas path: Hydrochloric acid, a byproduct containing vinyl chloride monomer produced in the calcium carbide method of vinyl chloride production, is collected and stored in hydrochloric acid storage tank 2 through hydrochloric acid pipe 1.

[0034] When the safety system is activated, nitrogen gas enters the top of the hydrochloric acid storage tank 2 through the nitrogen pipe 21, blowing the mixed gas of hydrochloric acid and vinyl chloride towards the primary alkali seal tank 3. The mixed gas entering the primary alkali seal tank 3 is first blocked by the large orifice plate 31, prolonging the residence time and facilitating the absorption of hydrochloric acid in the mixed gas by the alkali solution. This step can absorb more than 99% of the hydrochloric acid gas. The remaining gas continues to rise and may encounter the spray device 32 which adds alkali solution. If there is any hydrochloric acid that has not been completely neutralized and absorbed, it can react with the sprayed alkali solution. If there is enough alkali solution in the primary alkali seal tank 3, the spray device 32 will not add alkali solution, and the gas will continue to rise into the secondary alkali seal tank 4.

[0035] Similarly, the gas entering the secondary alkali seal tank 4 is first blocked by the orifice plate 41, prolonging the residence time. The hydrochloric acid remaining in the vinyl chloride gas is completely neutralized by the alkali solution, and the remaining gas continues to rise and is collected in the vinyl chloride gas holder 5.

[0036] 2. Alkali solution path: The primary alkali seal tank 3 and the secondary alkali seal tank 4 are automatically controlled to add alkali and replace alkali solution. After the mixed gas enters the primary alkali seal tank 3, the alkali solution absorbs the hydrochloric acid in it, and the pH value decreases. After the hydrochloric acid is absorbed by the primary alkali seal tank 3, the vinyl chloride and nitrogen enter the secondary alkali seal tank 4, where the alkali solution absorbs any remaining hydrochloric acid a second time, ensuring that the final clean vinyl chloride and nitrogen enter the vinyl chloride gas holder 5.

[0037] 3. The system's automatic control process is as follows: The vinyl chloride detector 23 is equipped with two alarm levels. The first alarm value should be less than or equal to 10 mg / m³. 3 The level 2 alarm value should be less than or equal to 20 mg / m³. 3 .

[0038] When a Level 1 alarm is triggered, the signal is transmitted to the safety system controller 25. The safety system controller 25 controls the opening of the regulating valve 22 to increase the nitrogen gas intake. The nitrogen gas carries vinyl chloride gas and hydrochloric acid gas into the Level 1 alkaline sealing tank 3 until the Level 1 alarm disappears. Then, the safety system controller 25 controls the regulating valve to reset.

[0039] When a Level 2 alarm is triggered, the signal is transmitted to the safety system controller 25. The safety system controller 25 first closes the acid valve 11 of the hydrochloric acid storage tank 2, causing the hydrochloric acid flowing into the hydrochloric acid pipe 1 to switch to the backup hydrochloric acid storage tank (not shown in the figure; multiple hydrochloric acid storage tanks 2 are connected in parallel on the hydrochloric acid pipe, and hydrochloric acid can be switched between the various storage tanks). Then, it controls the opening of the regulating valve 22 to increase the nitrogen gas intake. The nitrogen gas carries the vinyl chloride gas and hydrochloric acid gas into the primary alkali sealing tank 3 until the Level 1 alarm disappears. The safety system controller 25 first controls the regulating valve to reset, and then controls the acid valve 11 to switch the hydrochloric acid flow into the hydrochloric acid storage tank 2.

[0040] When the pressure transmitter 24 detects an abnormal pressure, it transmits a signal to the safety system controller 25. The safety system controller 25 first switches the hydrochloric acid flow to the backup hydrochloric acid storage tank (repeating the action of the vinyl chloride detector 23 during the secondary alarm response), and then completely closes the regulating valve 22, allowing the gas in the hydrochloric acid storage tank 2 to escape to the primary alkali seal tank 3, until the pressure transmitter 24 detects that the pressure is normal. Then it controls the opening of the regulating valve 22, thereby switching the hydrochloric acid flow into the hydrochloric acid storage tank 2 and restoring the normal operation process.

[0041] The automatic control process of the alkali system is as follows: pH meter 1 (33) and pH meter 2 (43) are used to monitor the pH value in the primary alkali seal tank 3 and the secondary alkali seal tank 4, respectively. pH meter 3 (51) is used to monitor the pH value of vinyl chloride gas entering the vinyl chloride gas holder 5. Under normal circumstances, pH meter 3 (51) will always show between 7 ± 0.1 and will not change significantly.

[0042] When the readings of pH meter 133 and pH meter 243 are less than 8, alkali needs to be added in advance. Alkali should not be added after the pH drops to around 7, otherwise it will affect the purity of vinyl chloride gas.

[0043] When the pH meter reading is less than 8, first open the residual alkali valve 36 to drain the alkali and empty the residual alkali in the primary alkali sealing tank 3. After emptying, close the residual alkali valve 36. With the help of opening the alkali replenishment valve 35 and the alkali pump 7, adjust the flow rate of the alkali replenishment valve 35 to increase the alkali supply quickly. This will cause the liquid level to rise rapidly above the large orifice plate 31. Then, adjust the flow rate of the alkali replenishment valve 35 to restore its normal flow rate. After the primary alkali sealing tank 3 is emptied, the hydrochloric acid gas in the primary alkali sealing tank 3 will only be partially absorbed by the alkali mist sprayed by the spray device 32. The rest will enter the secondary alkali sealing tank 4 and be absorbed.

[0044] When the pH meter reading is less than 8, first open the residual alkali valve 46 to drain the alkali and empty the residual alkali in the secondary alkali sealing tank 4. After emptying, close the residual alkali valve 46. With the help of opening the alkali replenishment valve 45 and the alkali pump 7, adjust the flow rate of the alkali replenishment valve 45 to increase the alkali supply quickly and make the liquid level rise rapidly above the orifice plate 41. Then adjust the flow rate of the alkali replenishment valve 45 to restore it. After the secondary alkali sealing tank 4 is emptied, since the hydrochloric acid gas has been almost completely absorbed in the primary alkali sealing tank 3, any remaining gas can be completely removed by the alkali mist sprayed by the spray device 42. Finally, the clean vinyl chloride enters the vinyl chloride gas holder 5.

[0045] There is only one special case to be aware of: after long-term use, if the pH of the alkaline solution in both the backup secondary alkaline sealing tank 4 and the primary alkaline sealing tank 3 is close to 8, then the alkaline solution in the secondary alkaline sealing tank 4 needs to be replaced first to ensure that it serves as the last line of defense and maintains sufficient alkalinity before replacing the alkaline solution in the primary alkaline sealing tank 3.

[0046] During regular maintenance, it is necessary to clean the small amount of precipitate (trace solid matter in the gas, a small amount of salt and alkali precipitate) accumulated in the alkali system. At this time, it is necessary to close the alkali replenishment valve 61, open the pure water valve 81, and simultaneously open the purge valve 9, residual alkali valve 1 36, and residual alkali valve 2 46 to form a passage. The water-gas mixture will flow into the primary alkali sealing tank 3 through the alkali replenishment valve 1 35 and into the secondary alkali sealing tank 4 through the alkali replenishment valve 2 45. The spray device 1 32 and spray device 2 42 are first self-cleaned by water and gas flushing, and then flush the tank wall, large orifice plate 31, and small orifice plate 41 of the alkali sealing tank. After flushing, the solid-liquid-gas mixture is discharged from the residual alkali pipe and the alkali system is reset. After replenishing alkali, the maintenance can be completed.

[0047] It should be noted that the PLC controller, vinyl chloride detector, pressure transmitter, pH meter, level gauge, pump, valve, etc. used in this embodiment are all commercially available products. The specific selection and calculation methods are determined based on production capacity and budget. The power supply and principle do not need to be mastered by those skilled in the art. As long as they can be used according to the operating instructions, it will not affect the sufficiency of the disclosure of this utility model, and will not be described in detail here.

Claims

1. A safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride, wherein the device is connected to the rear end of a hydrochloric acid storage tank (2), the hydrochloric acid storage tank (2) is provided with a nitrogen pipe (21), and the nitrogen pipe (21) is provided with a regulating valve (22); characterized in that: The device includes a primary alkali seal tank (3), a secondary alkali seal tank (4), and a vinyl chloride gas holder (5) connected in sequence; the primary alkali seal tank (3) is provided with a large perforated plate (31) in the lower part and a spray device (32) in the upper part; the secondary alkali seal tank (4) is provided with a small perforated plate (41) in the lower part and a spray device (42) in the upper part.

2. The safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride, as described in claim 1, is characterized in that: The device also includes an alkali replenishment tank (6), an alkali pump (7), and a pure water tank (8) that are connected to each other. An alkali replenishment valve (61) is provided on the connecting pipe between the alkali replenishment tank (6) and the alkali pump (7). The alkali pump (7) is connected to the first spray device (32) and the second spray device (42) respectively. A pure water valve (81) is provided on the connecting pipe between the alkali pump (7) and the pure water tank (8).

3. The safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride, as described in claim 2, is characterized in that: The lower part of the primary alkali sealing tank (3) is equipped with a pH meter (33), and the upper part of the primary alkali sealing tank (3) is equipped with a level gauge (34); the lower part of the secondary alkali sealing tank (4) is equipped with a pH meter (43), and the upper part of the secondary alkali sealing tank (4) is equipped with a level gauge (44).

4. The safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride, as described in claim 3, is characterized in that: The spray device 1 (32) is provided with an alkali replenishment valve 1 (35) at the pipe inlet, and the primary alkali seal tank (3) is provided with a residual alkali valve 1 (36) on the lower alkali discharge pipe; the spray device 2 (42) is provided with an alkali replenishment valve 2 (45) at the pipe inlet, and the secondary alkali seal tank (4) is provided with a residual alkali valve 2 (46) on the lower alkali discharge pipe.

5. A safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride, as described in claim 4, characterized in that: A pH meter (51) is installed on the connecting pipeline between the secondary alkali sealing tank (4) and the vinyl chloride gas holder (5).

6. The safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride, as described in claim 5, is characterized in that: A gas path is provided on the main connecting pipeline between the alkali pump (7) and the spray device 1 (32) and the spray device 2 (42). The gas path is connected to the nitrogen pipe (21), and a purge valve (9) is provided on the gas path.

7. A safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride, as described in claim 6, characterized in that: The device also includes an alkali system controller (10), the input terminals of which are connected to pH meter 1 (33), level gauge 1 (34), pH meter 2 (43), level gauge 2 (44), and pH meter 3 (51), respectively. The output terminals of the alkali system controller (10) are connected to alkali replenishment valve 1 (35), alkali replenishment valve 2 (45), residual alkali valve 1 (36), residual alkali valve 2 (46), alkali replenishment valve (61), alkali pump (7), pure water valve (81), and purge valve (9), respectively.

8. The safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride, as described in claim 1, is characterized in that: The top of the hydrochloric acid storage tank (2) is equipped with a vinyl chloride detector (23) and a pressure transmitter (24); the vinyl chloride detector (23) and the pressure transmitter (24) are connected to the input terminal of a safety system controller (25), and the input terminal of the safety system controller (25) is connected to a regulating valve (22).

9. A safety protection device for a hydrochloric acid storage tank, a byproduct of the calcium carbide process for vinyl chloride, as described in claim 1, characterized in that: The hydrochloric acid storage tank (2) is provided with a hydrochloric acid pipe (1) at the front end, and an acid valve (11) is provided on the hydrochloric acid pipe (1).

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