Pressure protection device for chlorine system

Abstract

The utility model discloses a chlorine system pressure protection device which comprises an electrolytic bath, a chlorine washing tower, a chlorine cooler, a negative pressure water seal, a chlorine compressor and the like which are connected in sequence, the arranged negative pressure water seal is broken when an interlocking fault occurs and the negative pressure of the chlorine system is increased, air is supplemented into the system through an air supplementing pipe, and the chlorine system is protected. Safe operation of chlorine treatment equipment and a chlorine header pipe is guaranteed; an inlet and outlet pressure remote transmission pressure difference alarm arranged on the chlorine cooler can warn an operator to timely pay attention to the water seal liquid level change condition and pressure fluctuation caused by internal faults or crystallization of the chlorine cooler in advance; the interlocking of the pressure remote transmission and the deinsectization valve arranged at the outlet of the chlorine compressor can release pressure through the deinsectization valve when the positive pressure fluctuation of the chlorine system is within a controllable range, so that the device can effectively improve the stable operation of the chlorine system and solve the problem of negative pressure damage of the chlorine main pipe and the chlorine drying equipment caused by the system interlocking loop fault; and the subsequent hydrogen chloride synthesis ratio is influenced.

Description

Technical Field

[0001] The utility model belongs to the field of chlor-alkali production, and specifically relates to a chlorine system pressure protection device. Background Art

[0002] In the ion membrane caustic soda production system, the important equipment of the chlor-alkali production device includes ion membrane electrolyzer, chlorine compressor and hydrogen compressor, etc. As the front end of the chlor-alkali production process, it is responsible for the production of chlorine, hydrogen and caustic soda. The safety and stability of production is extremely important, and its core lies in the stable pressure control of chlorine and hydrogen in the system; the ion membrane chlor-alkali system is a continuous system and must be in operation at the same time. If one process stops, the others must also stop, otherwise it will cause chlorine leakage, explosion and other serious consequences. Based on the protection of the safe operation of the system and important equipment, a system protection interlock is set. When any of the electrolytic cells, all electrolytic cells, hydrogen compressors and chlorine compressors stops, the interlock system will stop; at the same time, positive and negative pressure water seals are set on the chlorine main pipe to protect the electrolytic cells.

[0003] During system operation, the system stops in an emergency. After the interlock is started, the chlorine shut-off valve installed on the chlorine pipe at the outlet of the electrolytic cell is closed to protect the electrolytic cell. In case of a system interlock circuit failure, the chlorine compressor fails to stop in time according to the interlock procedure, which will cause the negative pressure of the chlorine system to increase, causing negative pressure damage to the chlorine main pipe and chlorine drying equipment. In severe cases, chlorine leakage may occur, seriously threatening safe production. Since the normal combustion of the hydrogen chloride synthesis furnace requires the normal ratio of chlorine and hydrogen flow rates entering the furnace, large fluctuations in the chlorine pressure in the electrolysis process will seriously affect the safe and stable operation of the hydrogen chloride synthesis furnace. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, improve the stable operation of the chlorine system, effectively solve the problems of negative pressure damage to the chlorine main pipe and chlorine drying equipment caused by interlocking circuit failure, and the impact on the subsequent hydrogen chloride synthesis ratio, the utility model provides a chlorine system pressure protection device.

[0005] The technical solution of the utility model is as follows:

[0006] A chlorine system pressure protection device comprises an electrolytic cell, a chlorine scrubber, a chlorine cooler, a negative pressure water seal, a water mist separator, a chlorine drying tower, an acid mist collector and a chlorine compressor which are connected in sequence, wherein the electrolytic cell is connected to the chlorine scrubber via a chlorine main pipe, the chlorine cooler is respectively provided with a chlorine cooler inlet pipe, a chlorine cooler outlet pipe and a chlorine cooling water replenishment pipe, the chlorine cooler inlet pipe is provided with a chlorine cooler inlet pressure remote transmission, the chlorine cooler outlet pipe is provided with a chlorine cooler outlet temperature remote transmission and a chlorine cooler outlet pressure remote transmission, the chlorine cooling water replenishment pipe is provided with a chlorine cooling water replenishment valve and is electrically connected to the chlorine cooler outlet temperature remote transmission; the negative pressure water seal is provided with an air inlet pipe, an air replenishment pipe, a water replenishment pipe, an overflow pipe and a liquid level meter The air inlet pipe on the negative pressure water seal is connected to the outlet pipe of the chlorine cooler, the overflow pipe is connected to the lower part of the chlorine scrubber, the water replenishment valve provided on the water replenishment pipe is electrically connected to the liquid level gauge, and the overflow pipe is provided with overflow valves of several heights; the compressor inlet pipe and the compressor outlet pipe provided by the chlorine compressor are connected through a reflux pipe provided with a reflux valve, the front end of the compressor inlet pipe provided with a compressor inlet pressure remote transmission and a regulating valve is connected to the acid mist separator, the compressor outlet pipe is provided with a compressor outlet pressure remote transmission a, a compressor outlet pressure remote transmission b, a harm removal pipe and a hydrochloric acid removal pipe in sequence, the harm removal pipe and the hydrochloric acid removal pipe are provided with a harm removal valve and a hydrochloric acid removal valve respectively, and the harm removal valve is electrically connected to the compressor outlet pressure remote transmission a and the compressor outlet pressure remote transmission b.

[0007] Furthermore, the material of the chlorine cooler is usually titanium, and an alarm is activated when the pressure difference between the chlorine cooler inlet pressure remote transmission and the chlorine cooler outlet pressure remote transmission exceeds a certain value.

[0008] Furthermore, the chlorine drying tower can be multiple towers connected in series to improve the drying effect, and the drying tower is provided with an acid supplement pipe.

[0009] Furthermore, the electrolytic cell and the compressor are provided with an interlocking switch, and when the interlocking switch is turned on, when the electrolytic cell or the chlorine compressor has any fault or stops due to power failure, the entire interlocking system will stop.

[0010] Furthermore, the compressor inlet pressure remote transmitter and the regulating valve provided on the chlorine compressor are electrically connected, the regulating valve is set to a preset value, and the opening of the regulating valve is opened or closed according to the display value of the compressor inlet pressure remote transmitter to control the pressure of the entire chlorine system; when the display values ​​of the compressor outlet pressure remote transmitter a and the compressor outlet pressure remote transmitter b provided on the outlet pipe of the chlorine compressor reach the preset values ​​at the same time, the interlock is opened to relieve the pressure of the decontamination valve system.

[0011] Furthermore, a certain liquid level is controlled inside the negative pressure water seal, and automatic water replenishment is achieved by electrically connecting the water replenishment valve arranged on the water replenishment pipe to the liquid level gauge. Overflow valves of several heights are arranged on the overflow pipe, and the uppermost valve is kept open to ensure the water seal liquid level; the air replenishment pipe is connected to the space exhaust gas pipeline.

[0012] The beneficial effects of the utility model are as follows: the negative pressure water seal provided in the device is broken when an interlocking fault occurs and the negative pressure of the chlorine system increases, and air is replenished into the system through the air replenishing pipe, so as to ensure the safe operation of the chlorine treatment equipment and the chlorine main pipe; the inlet and outlet pressure remote transmission pressure differential alarm provided in the chlorine cooler, the chlorine cooling water replenishing pipe is provided with a chlorine cooling water replenishing valve, and the replenishing water amount is timely adjusted through the remote transmission display of the outlet temperature of the chlorine cooler, and the chlorine temperature is strictly controlled, and the pressure differential alarm can give an early warning, so that the operator can pay attention to the change of the water seal liquid level and the pressure fluctuation caused by the internal fault or crystallization of the chlorine cooler in time; the pressure remote transmission provided at the outlet of the chlorine compressor is interlocked with the deodorizing valve, and the pressure is relieved through the deodorizing valve when the positive pressure fluctuation of the chlorine system is within the controllable range, and the electrolytic cell and the compressor system are interlocked and stopped when the pressure fluctuation cannot be adjusted in time; the above technical structure of the device is provided to improve the stable operation of the chlorine system, and effectively solve the problems of negative pressure damage to the chlorine main pipe and the chlorine drying equipment caused by the interlocking loop fault, and the influence on the subsequent hydrogen chloride synthesis ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the utility model.

[0014] In the figure: 1. electrolytic cell; 2. chlorine scrubber; 3. chlorine cooler; 31. chlorine cooler inlet pipe; 32. chlorine cooler inlet pressure remote transmission; 33. chlorine cooling water supply pipe; 34. chlorine cooling water supply valve; 35. chlorine cooler outlet temperature remote transmission; 36. chlorine cooler outlet pipe; 37. chlorine cooler outlet pressure remote transmission; 4. water mist separator; 5. negative pressure water seal; 51. air inlet pipe; 52. water supply valve; 53. liquid level meter; 54. air supply pipe; 55. overflow pipe; 56. Water supply pipe; 57. Overflow valve; 6. Chlorine drying tower; 7. Acid mist separator; 8. Chlorine compressor 81. Compressor inlet pipe; 82. Reflux pipe; 83. Reflux valve; 84. Compressor inlet pressure remote transmission; 85. Regulating valve; 86. Compressor outlet pressure remote transmission a; 87. Compressor outlet pressure remote transmission b; 88. Harm removal pipe; 89. Hydrochloric acid removal pipe; 810. Harm removal valve; 811. Compressor outlet pipe; 812. Hydrochloric acid removal valve; 9. Chlorine inlet main pipe; 10. Acid supply pipe. DETAILED DESCRIPTION

[0015] The following is a complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the present invention, not all embodiments. Other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention. Example

[0016] Example 1: Reference Figure 1 As shown, the utility model provides a chlorine system pressure protection device, comprising an electrolytic cell 1, a chlorine scrubber 2, a chlorine cooler 3, a negative pressure water seal 5, a water mist separator 4, a chlorine drying tower 6, an acid mist collector 7 and a chlorine compressor 8 connected in sequence, the electrolytic cell 1 is connected to the chlorine scrubber 2 via a chlorine main pipe 9, the chlorine cooler 3 is respectively provided with a chlorine cooler inlet pipe 31, a chlorine cooler outlet pipe 36 and a chlorine cooling water replenishment pipe 33, the chlorine cooler inlet pipe 31 is provided with a chlorine cooler inlet pressure remote transmission 32, the chlorine cooler outlet pipe 36 is provided with a chlorine cooler outlet temperature remote transmission 35 and a chlorine cooler outlet pressure remote transmission 37, the chlorine cooling water replenishment pipe 33 is provided with a chlorine cooling water replenishment valve 34 and is electrically connected to the chlorine cooler outlet temperature remote transmission 35; the negative pressure water seal 5 is provided with an air inlet pipe 51, an air replenishment pipe 54, a water replenishment pipe 56, an overflow pipe 55 and a liquid level meter 53, The air inlet pipe 51 on the negative pressure water seal 5 is connected to the chlorine cooler outlet pipe 36, and the overflow pipe 55 is connected to the lower part of the chlorine scrubber 2. The water replenishment valve 52 provided on the water replenishment pipe 56 is electrically connected to the liquid level meter 53, and the overflow pipe 55 is provided with an overflow valve 57 of several heights; the compressor inlet pipe 81 and the compressor outlet pipe 811 provided by the chlorine compressor 8 are communicated through the reflux pipe 82 provided with a reflux valve 83, and the front end of the compressor inlet pipe 81 provided with a compressor inlet pressure remote transmission 84 and a regulating valve 85 is connected to the acid mist separator 7, and the compressor outlet pipe 811 is provided with a compressor outlet pressure remote transmission a86, a compressor outlet pressure remote transmission b87, a harm removal pipe 88 and a hydrochloric acid removal pipe 89 in sequence, and the harm removal pipe 88 and the hydrochloric acid removal pipe 89 are respectively provided with a harm removal valve and a hydrochloric acid removal valve 812, and the harm removal valve 810 is electrically connected to the compressor outlet pressure remote transmission a86 and the compressor outlet pressure remote transmission b87.

[0017] Furthermore, the material of the chlorine cooler 3 is usually titanium, and an alarm is activated when the pressure difference between the chlorine cooler inlet pressure remote transmission 32 and the chlorine cooler outlet pressure remote transmission 37 exceeds a certain value.

[0018] Furthermore, the chlorine drying tower 6 can be multiple towers connected in series to improve the drying effect, and the drying tower is provided with an acid supplement pipe 10.

[0019] Furthermore, the electrolytic cell 1 and the compressor 8 are provided with an interlocking switch. When the interlocking switch is turned on, when the electrolytic cell 1 or the chlorine compressor 8 has any fault or stops due to power failure, the entire interlocking system will stop.

[0020] Furthermore, the compressor inlet pressure remote transmitter 84 and the regulating valve 85 provided on the chlorine compressor 8 are electrically connected, the regulating valve 85 is set to a preset value, and the regulating valve opening is opened or closed according to the display value of the compressor inlet pressure remote transmitter 84 to control the pressure of the entire chlorine system; when the display values ​​of the compressor outlet pressure remote transmitter a86 and the compressor outlet pressure remote transmitter b87 provided on the chlorine compressor outlet pipe 811 reach the preset values ​​at the same time, the interlock opens the decontamination valve 810 to release the system pressure.

[0021] Furthermore, a certain liquid level is controlled inside the negative pressure water seal 5, and automatic water replenishment is achieved by electrically connecting the water replenishment valve 52 arranged on the water replenishment pipe 56 to the liquid level meter 53. Overflow valves 57 of several heights are arranged on the overflow pipe 55, and the uppermost valve is kept open to ensure the water seal liquid level. The air replenishment pipe 54 is connected to the space exhaust gas pipeline.

[0022] Embodiment 2: The chlorine produced by electrolysis of refined brine in an electrolytic cell 1 passes through a chlorine inlet main pipe 9, a chlorine washing tower 2, a chlorine cooler 3, a water mist separator 4, a chlorine drying tower 6, an acid mist separator 7 and a chlorine compressor 8. The chlorine is washed, cooled and compressed before being sent to a subsequent process for synthesizing hydrogen chloride. The outlet temperature of the chlorine cooler is strictly controlled between 11 and 15°C. The chlorine cooling water replenishment valve 34 has a preset value of 13°C. When the remote transmission display value of the chlorine cooler outlet temperature is higher or lower than the preset value, the chlorine cooling water replenishment valve is closed or opened. When the remote transmission pressure difference of the inlet and outlet pressures of the chlorine cooler is greater than 1kpa, an alarm is activated, which can warn the operator in advance to pay attention to the changes in the liquid level of the negative pressure water seal 5 and the pressure fluctuations caused by internal failures or crystallization of the chlorine cooler 3; the pressure The regulating valve 85 at the compressor inlet cooperates with the reflux valve 83 to control the chlorine system pressure to run smoothly within the normal range according to the displayed value of the compressor inlet pressure remote transmission 84. After compression, it is sent to the subsequent process through the hydrochloric acid removal pipe 89. In case of system pressure fluctuation, the regulating valve 85 cannot be normally regulated. When the chlorine system pressure fluctuation is greater than 0.16Mpa, that is, the compressor outlet pressure remote transmission a and the compressor outlet pressure remote transmission b displayed values ​​are both greater than 0.16Mpa, the degassing valve 810 set at the compressor outlet is started to release pressure to stabilize the system pressure; the negative pressure water seal set in this device will break when the chlorine system pressure fluctuation is less than -6kpa in case of interlocking failure, and air will be added into the system through the air supply pipe to ensure the safe operation of the chlorine treatment equipment and the chlorine main pipe.

[0023] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A chlorine system pressure protection device, characterized in that: The invention comprises an electrolytic cell, a chlorine scrubber, a chlorine cooler, a negative pressure water seal, a water mist separator, a chlorine drying tower, an acid mist collector and a chlorine compressor which are connected in sequence. The electrolytic cell is connected to the chlorine scrubber via a chlorine main pipe. The chlorine cooler is provided with a chlorine cooler inlet pipe, a chlorine cooler outlet pipe and a chlorine cooling water supply pipe respectively. The chlorine cooler inlet pipe is provided with a chlorine cooler inlet pressure remote transmission, the chlorine cooler outlet pipe is provided with a chlorine cooler outlet temperature remote transmission and a chlorine cooler outlet pressure remote transmission. The chlorine cooling water supply pipe is provided with a chlorine cooling water supply valve and is electrically connected to the chlorine cooler outlet temperature remote transmission. The negative pressure water seal is provided with an air inlet pipe, an air supply pipe, a water supply pipe, an overflow pipe and a liquid level gauge. The negative pressure water seal The air inlet pipe on the chlorine gas cooler is connected to the outlet pipe of the chlorine gas cooler, and the overflow pipe is connected to the lower part of the chlorine gas washing tower. The water replenishment valve provided on the water replenishment pipe is electrically connected to the liquid level meter, and the overflow pipe is provided with overflow valves of several heights; the compressor inlet pipe and the compressor outlet pipe provided by the chlorine gas compressor are communicated through a reflux pipe provided with a reflux valve, and the front end of the compressor inlet pipe provided with a compressor inlet pressure remote transmission and a regulating valve is connected to the acid mist separator, and the compressor outlet pipe is provided with a compressor outlet pressure remote transmission a, a compressor outlet pressure remote transmission b, a harm removal pipe and a hydrochloric acid removal pipe in sequence, and the harm removal pipe and the hydrochloric acid removal pipe are respectively provided with a harm removal valve and a hydrochloric acid removal valve, and the harm removal valve is electrically connected to the compressor outlet pressure remote transmission a and the compressor outlet pressure remote transmission b.

2. A chlorine system pressure protection device according to claim 1, characterized in that: The chlorine cooler is made of titanium. When the pressure difference between the chlorine cooler inlet pressure remote transmission and the chlorine cooler outlet pressure remote transmission exceeds a certain value, an alarm is activated.

3. A chlorine system pressure protection device according to claim 1, characterized in that: The chlorine drying tower is a plurality of towers connected in series to improve the drying effect, and the drying tower is provided with an acid supplement pipe.

4. A chlorine system pressure protection device according to claim 1, characterized in that: The electrolytic cell and the compressor are provided with an interlocking switch. When the interlocking switch is turned on, when the electrolytic cell or the chlorine compressor has any fault or stops due to power failure, the interlocking system will stop completely.

5. A chlorine system pressure protection device according to claim 1, characterized in that: The compressor inlet pressure remote transmitter and the regulating valve provided on the chlorine compressor are electrically connected, the regulating valve is set to a preset value, and the regulating valve opening is opened or closed according to the display value of the compressor inlet pressure remote transmitter to control the pressure of the entire chlorine system; when the display values ​​of the compressor outlet pressure remote transmitter a and the compressor outlet pressure remote transmitter b set on the outlet pipe of the chlorine compressor reach the preset values ​​at the same time, the interlock is opened to relieve the pressure of the deodorizing valve system.

6. A chlorine system pressure protection device according to claim 1, characterized in that: A certain liquid level is controlled inside the negative pressure water seal, and automatic water replenishment is achieved by electrically connecting the water replenishment valve arranged on the water replenishment pipe to the liquid level gauge. Overflow valves of several heights are arranged on the overflow pipe, and the uppermost valve is kept open to ensure the water seal liquid level.

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