Chlorine absorption interlocking switching device
By designing a chlorine absorption interlock switching device, it automatically switches to an accident alkali circulation tank with a larger volume, the problems of alkali liquid saturation and overflow in chlorine leakage accidents are solved, ensuring personnel safety and environmental cleanliness.
Patent Information
- Application Number
- CN202420047034.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-09
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-01-09
AI Technical Summary
When a chlorine leak accident occurs, it is difficult for the existing technology to effectively absorb a large amount of chlorine, resulting in saturation or overflow of the alkali liquid, which may cause environmental pollution and personnel poisoning.
A chlorine absorption interlocking switching device is designed to automatically switch the supply of alkali liquid in the first-level absorption tower through the interlocking control of the ion membrane removal valve, the first-level alkali circulation tank inlet cut valve, the first-level alkali circulation tank outlet cut valve, the first-level alkali circulation tank outlet cut valve, and the first-level alkali circulation tank inlet cut valve, the first-level alkali circulation tank outlet cut valve and the first-level alkali circulation tank inlet cut valve, and the first-level alkali absorption tank inlet cut valve is absorbed by the larger volume of the accidental alkali circulation tank.
When a chlorine leak accident occurs, it can switch to an accident alkali circulation tank with a larger volume in time to avoid saturation and overflow of alkali liquid, and protect the safety of staff and the cleanliness of the environment.
Smart Images
Figure CN222641665U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chlorine absorption treatment, and in particular relates to a chlorine absorption interlock switching device in the event of abnormal production when an ion membrane cell is stopped. Background Art
[0002] The chlorine used in the chlorine-hydrogen process of the caustic soda plant is produced by the electrolysis process and transported through the chlorine main pipe. In order to prevent the pipeline from being damaged due to excessive pressure in the chlorine main pipe, and then a chlorine leakage accident occurs, a branch is provided on the chlorine main pipe to connect the decontamination system to relieve pressure and transport chlorine. Under normal production conditions, the ion membrane decontamination valve is closed and automatically opens when the pressure in the chlorine main pipe is too high. The decontamination system (using caustic soda solution to absorb chlorine-containing waste gas generated during the production process to prevent environmental pollution) is particularly important as a waste chlorine absorption system for the caustic soda plant. The system is equipped with a first-level decontamination absorption tower, a first-level decontamination alkali circulation tank, an accident alkali circulation tank, a second-level decontamination absorption tower, a second-level decontamination alkali circulation tank, an alkali high-level tank, a decontamination fan and other facilities. When excessive chlorine reacts with alkali solution, the alkali solution will be saturated and unable to continue to absorb chlorine. After the chlorine comes into contact with the alkali solution, the reaction volume increases, which may cause the alkali solution to overflow. The chlorine gas enters the first and second level absorption towers of the removal of harmful substances in turn and contacts and absorbs the alkali solution in the towers. After passing the test, the gas is discharged to the outside through the removal of harmful substances fan. The alkali solution in the first level absorption tower of the removal of harmful substances is provided by the first level alkali circulation tank of the removal of harmful substances or the accident alkali circulation tank through the first level circulation alkali pump of the removal of harmful substances. The first level alkali circulation tank of the removal of harmful substances is used to provide the circulating alkali solution during normal production, and the accident alkali circulation tank is used to provide the circulating alkali solution when chlorine gas leaks. The alkali solution in the second level absorption tower of the removal of harmful substances is provided by the second level alkali circulation tank of the removal of harmful substances through the second level circulation alkali pump of the removal of harmful substances. In order to ensure that the chlorine gas can be fully absorbed when a chlorine gas leakage accident occurs, and the alkali solution in the tank will not overflow due to the inhalation of excessive chlorine gas, it is necessary to switch the first level alkali circulation tank of the removal of harmful substances that provides the circulating alkali solution for the first level absorption tower of the removal of harmful substances to the accident alkali circulation tank with a larger volume (the volume of the accident alkali circulation tank is 3 to 5 times that of the first level alkali circulation tank of the removal of harmful substances), and the saturated alkali solution after absorbing the chlorine gas is transported to the acid and alkali tank area for treatment. In order to prevent chlorine gas leakage from polluting the air or causing personnel poisoning, the device described in the utility model is specially designed. Utility Model Content
[0003] The utility model provides a chlorine gas absorption interlock switching device in order to solve the above problems.
[0004] The chlorine absorption interlock switching device is composed of an ion membrane detoxification valve, an inlet cut-off valve of a first-level alkali circulation tank for detoxification, an outlet cut-off valve of a first-level alkali circulation tank for detoxification, an outlet cut-off valve of an accident alkali circulation tank, and an inlet cut-off valve of an accident alkali circulation tank. The ion membrane detoxification valve is interlocked with the inlet cut-off valve of the first-level alkali circulation tank for detoxification, the outlet cut-off valve of the first-level alkali circulation tank for detoxification, the outlet cut-off valve of the accident alkali circulation tank, and the inlet cut-off valve of the accident alkali circulation tank. The inlet cut-off valve of the first-level alkali circulation tank for detoxification and the outlet cut-off valve of the first-level alkali circulation tank for detoxification are arranged at the inlet and outlet of the first-level alkali circulation tank for detoxification, and the outlet cut-off valve of the accident alkali circulation tank and the inlet cut-off valve of the accident alkali circulation tank are arranged at the outlet and inlet of the accident alkali circulation tank. In normal use, the inlet cut-off valve of the first-level alkali circulation tank for detoxification and the outlet cut-off valve of the first-level alkali circulation tank for detoxification are opened, the outlet cut-off valve of the accident alkali circulation tank and the inlet cut-off valve of the accident alkali circulation tank are closed, and the alkali solution in the first-level alkali circulation tank for detoxification enters the first-level absorption tower for detoxification through the outlet cut-off valve of the first-level alkali circulation tank for detoxification to absorb chlorine. Gas, and then returns to the first-level alkali circulation tank for harm removal through the inlet cut-off valve of the first-level alkali circulation tank for harm removal; when the pressure of the ion membrane chlorine main pipe is higher than 0.00KPa, and the opening degree of the ion membrane harm removal valve is greater than 10%, a DCS signal is triggered to enter the system, and the system automatically controls the inlet cut-off valve and the outlet cut-off valve of the first-level alkali circulation tank for harm removal to be closed, and the outlet cut-off valve and the inlet cut-off valve of the accident alkali circulation tank are opened, and the alkali solution in the accident alkali circulation tank enters the first-level absorption tower for harm removal through the outlet cut-off valve of the accident alkali circulation tank to absorb chlorine, and then returns to the accident alkali circulation tank through the inlet cut-off valve of the accident alkali circulation tank; that is, the chlorine absorption alkali solution used in the first-level absorption tower for harm removal is switched from the first-level alkali circulation tank for harm removal to the accident alkali circulation tank with a larger volume, and this interlocking device can avoid the alkali solution from being saturated and unable to continue to absorb when a large amount of chlorine leaks into the first-level absorption tower for harm removal, or the operator forgets to manually switch the alkali tank, resulting in air pollution and poisoning injuries to on-site workers.
[0005] The inlet shut-off valve of the first-level alkali circulation tank for harm removal, the outlet shut-off valve of the first-level alkali circulation tank for harm removal, the outlet shut-off valve of the accident alkali circulation tank, and the inlet shut-off valve of the accident alkali circulation tank are all DN250 pneumatic butterfly valves, made of 304 / PTFE; the ion membrane harm removal valve is a DN300 single-seat lined PTFE regulating valve, which can be automatically opened and closed under the drive of the opening information signal from the ion membrane harm removal valve.
[0006] The beneficial effect of the utility model is that when the interlock is triggered, a large amount of chlorine gas can be absorbed in time by the alkali solution in the larger accident alkali circulation tank, thereby protecting the personal safety of the staff and ensuring that the environment will not be polluted. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 It is a schematic diagram of the utility model;
[0008] The names of the parts in the figure are: first-level alkali circulation tank inlet cut-off valve 1 for harm removal, first-level alkali circulation tank outlet cut-off valve 2 for harm removal, outlet cut-off valve 3 for accident alkali circulation tank, inlet cut-off valve 4 for accident alkali circulation tank, and ion membrane harm removal valve 5. DETAILED DESCRIPTION
[0009] Embodiment 1:
[0010] When normal production is running, chlorine is transported to the chlorine compressor through the ion membrane chlorine main pipe for chlorine treatment, and only a trace amount of chlorine in the pipeline enters the first-level absorption tower of the harm removal system for absorption treatment. The chlorine absorption alkali solution of the first-level absorption tower is provided by the first-level alkali circulation tank for harm removal. At this time, the first-level alkali circulation tank inlet cut-off valve 1 and the first-level alkali circulation tank outlet cut-off valve 2 for harm removal are opened, and the accident alkali circulation tank outlet cut-off valve 3 and the accident alkali circulation tank inlet cut-off valve 4 are closed; the alkali solution in the first-level alkali circulation tank for harm removal enters the first-level absorption tower for harm removal through the first-level alkali circulation tank outlet cut-off valve 2 for harm removal to absorb chlorine, and then returns to the first-level alkali circulation tank for harm removal through the first-level alkali circulation tank inlet cut-off valve 1 for harm removal; when the pressure of the ion membrane chlorine main pipe is higher than 0.00KPa, and the ion membrane detoxification valve 5 opening is greater than 10%, it is triggered The DCS signal enters the system, and the system automatically controls the first-level alkali circulation tank inlet shut-off valve 1 and the first-level alkali circulation tank outlet shut-off valve 2 to be closed, and the accident alkali circulation tank outlet shut-off valve 3 and the accident alkali circulation tank inlet shut-off valve 4 to be opened. The alkali liquid in the accident alkali circulation tank enters the first-level harm removal absorption tower through the accident alkali circulation tank outlet shut-off valve 3 to absorb chlorine, and then returns to the accident alkali circulation tank through the accident alkali circulation tank inlet shut-off valve 4; that is, the chlorine absorption alkali liquid used in the first-level harm removal absorption tower is switched from the first-level harm removal circulation alkali tank to the larger accident alkali circulation tank. This interlocking device can prevent the alkali liquid from being saturated and unable to continue to absorb when a large amount of chlorine leaks into the first-level harm removal absorption tower, or when the operator forgets to manually switch the alkali tank, resulting in air pollution and poisoning injuries to on-site workers.
Claims
1. A chlorine absorption interlock switching device, characterized in that: The invention comprises an ion membrane detoxification valve (5), an inlet cut-off valve (1) of a first-level alkali circulation tank for detoxification, an outlet cut-off valve (2) of a first-level alkali circulation tank for detoxification, an outlet cut-off valve (3) of an accident alkali circulation tank, and an inlet cut-off valve (4) of an accident alkali circulation tank. The ion membrane detoxification valve (5) is interlocked with the inlet cut-off valve (1) of the first-level alkali circulation tank for detoxification, the outlet cut-off valve (2) of the first-level alkali circulation tank for detoxification, the outlet cut-off valve (3) of the accident alkali circulation tank, and the inlet cut-off valve (4) of the accident alkali circulation tank. The inlet cut-off valve (1) of the first-level alkali circulation tank for detoxification and the outlet cut-off valve (2) of the first-level alkali circulation tank for detoxification are arranged at the inlet and outlet of the first-level alkali circulation tank for detoxification. The outlet cut-off valve (3) of the accident alkali circulation tank and the outlet cut-off valve (4) of the accident alkali circulation tank are interlocked with each other. The circulation tank inlet cut-off valve (4) is arranged at the outlet and the inlet of the accident alkali circulation tank; in normal use, the first-level alkali circulation tank inlet cut-off valve (1) and the first-level alkali circulation tank outlet cut-off valve (2) are opened, and the accident alkali circulation tank outlet cut-off valve (3) and the accident alkali circulation tank inlet cut-off valve (4) are closed; when the pressure of the ion membrane chlorine main pipe is higher than 0.00KPa and the opening of the ion membrane detoxification valve (5) is greater than 10%, a DCS signal is triggered to enter the system, and the system automatically controls the first-level alkali circulation tank inlet cut-off valve (1) and the first-level alkali circulation tank outlet cut-off valve (2) to be closed, and the accident alkali circulation tank outlet cut-off valve (3) and the accident alkali circulation tank inlet cut-off valve (4) to be opened.
2. A chlorine absorption interlock switching device as claimed in claim 1, characterized in that: The first-stage alkali circulation tank inlet shut-off valve (1), the first-stage alkali circulation tank outlet shut-off valve (2), the emergency alkali circulation tank outlet shut-off valve (3), and the emergency alkali circulation tank inlet shut-off valve (4) are all DN250 pneumatic butterfly valve shut-off valves; the ion membrane detoxification valve (5) is a DN300 single-seat PTFE-lined regulating valve.