A dual exhaust port venting device for the circulating tank of an HPF wet desulfurization tower

Abstract

This utility model discloses a dual-exhaust-port venting device for the circulating tank of an HPF wet desulfurization tower, belonging to the technical field of coke oven gasification product recovery and coke oven gas HPF wet desulfurization. It solves the problem that the gas entrained in the circulating tank of existing HPF wet desulfurization towers cannot be released and collected in a timely manner. This utility model has atmospheric venting pipes for the circulating tanks of the first to fourth desulfurization towers respectively. The bottom of the atmospheric venting pipes for the circulating tanks of the first and second desulfurization towers are connected, and the bottom of the atmospheric venting pipes for the circulating tanks of the third and fourth desulfurization towers are also connected. The two connections are connected to a buffer tank for the escaping gas of the circulating tank through an escaping gas collection pipe. A steam purging valve for the escaping gas collection pipe is provided between the control valves of the two escaping gas collection pipes. This utility model has a simple structure, reasonable design, low manufacturing cost, is easy to assemble, disassemble, and maintain, has strong practicality, and performs well in use.

Description

Technical Field

[0001] This utility model belongs to the field of coke oven gasification product recovery and coke oven gas HPF wet desulfurization technology, specifically involving a dual exhaust port venting device for the circulating tank of an HPF wet desulfurization tower. Background Technology

[0002] The normal hydrogen sulfide content in coke oven gas is 8000-12000 mg / m³. 3 The hydrogen sulfide content fluctuates depending on the sulfur content in the coal blend. Coke oven gas must undergo desulfurization, deammoniation, and benzene removal processes to remove toxic and harmful substances such as hydrogen sulfide and ammonia from the gas, while recovering economically valuable substances such as benzene hydrocarbons. Only after the coke oven gas is purified can it be further processed and used.

[0003] There are many types of desulfurization processes, but wet desulfurization is widely used because of its advantages such as short process, small footprint, high desulfurization efficiency, low infrastructure investment, and the use of high-efficiency new light ceramic packing with large specific surface area in the desulfurization tower, which is conducive to the tower efficiency. Among them, HPF wet desulfurization process is more common.

[0004] The desulfurization tower is an indispensable key piece of equipment in the desulfurization process, and its long-term stable and safe operation is inseparable from the unobstructed flow of the exhaust port of the circulation tank. The desulfurization tower circulation tank is equipped with an exhaust vent pipe, also known as an atmospheric connection pipe. Because the desulfurization liquid and coke oven gas come into countercurrent contact, the desulfurization liquid, flowing downwards, carries some gas into the desulfurization liquid circulation tank. This carried gas accumulates inside the desulfurization tower circulation tank. The main function of the exhaust vent pipe is to balance the pressure inside the desulfurization liquid circulation tank, making it the same as or close to atmospheric pressure. This prevents fluctuations and distortions in the desulfurization tower liquid level caused by the accumulation of large amounts of gas in the circulation tank, and prevents pressure imbalances in the desulfurization tower from causing desulfurization liquid to enter the gas pipeline, resulting in gas interception and affecting the safe operation of the gas blower. The unobstructed flow of the exhaust port of the desulfurization tower circulation tank is crucial to the safe and stable operation of both the desulfurization system and the gas system.

[0005] In actual production and operation, the desulfurization system is equipped with a single exhaust vent pipe. The single exhaust vent pipe has the following problems in actual operation:

[0006] 1. When only an atmospheric vent pipe for the desulfurization tower circulation tank is installed, the coal gas escaping from the desulfurization tower circulation tank during normal operation will be released into the atmosphere, releasing some toxic and harmful gases into the site, which is not conducive to environmental protection.

[0007] 2. When only a gas collection pipe for the desulfurization tower circulation tank is installed, the gas escaping from the desulfurization tower circulation tank during normal operation is collected through the pipeline, and then, under the suction of the gas blower, passes through the buffer tank and finally enters the negative pressure gas pipeline before the blower, which is beneficial to environmental protection. However, in winter, as the temperature drops, impurities such as naphthalene in the gas will condense and accumulate in the pipeline. When the vent pipe is blocked by naphthalene and other impurities carried by the gas, problems such as fluctuations in the desulfurization tower liquid level and gas leakage from the exhaust port will occur, seriously affecting the safe, environmentally friendly, and stable operation of the desulfurization system.

[0008] 3. When the desulfurization tower is equipped with only a single vent pipe, it is impossible to perform steam purging of the escaping gas pipeline in a timely manner, which affects the normal production of the desulfurization system.

[0009] This patent develops a dual-vent venting device for the circulating tank of an HPF wet desulfurization tower, which effectively solves the problem that the coal gas entrained in the circulating tank of the HPF wet desulfurization tower cannot escape and be collected in a timely manner. It ensures the accuracy of the liquid level value in the circulating tank of the desulfurization tower, reduces the risk of serious accidents such as desulfurization tower liquid level distortion and desulfurization liquid entering the coal gas pipeline caused by blockage of a single vent, and is conducive to the long-term, safe and stable operation of the desulfurization system. It is especially suitable for the safe operation of the desulfurization system in winter in extremely cold regions. Utility Model Content

[0010] The purpose of this invention is to provide a dual exhaust port venting device for the circulating tank of an HPF wet desulfurization tower, so as to solve the problem that the coal gas entrained in the circulating tank of the existing HPF wet desulfurization tower cannot be released and collected in a timely manner.

[0011] The technical solution of this utility model is: a dual exhaust port venting device for the circulating tank of an HPF wet desulfurization tower, comprising a first desulfurization tower, a second desulfurization tower, a third desulfurization tower, and a fourth desulfurization tower. Each of the first, second, third, and fourth desulfurization towers is equipped with a circulating tank atmospheric venting pipe. At the bottom of each of these pipes is a control valve, a control valve for the escaping gas collection pipe, and a steam purging valve. The bottoms of the circulating tank atmospheric venting pipes between the first and second desulfurization towers are connected, as are those between the third and fourth desulfurization towers. The two connections are connected to an escaping gas buffer tank via an escaping gas collection pipe. A steam purging valve is located between the control valves of the two escaping gas collection pipes.

[0012] As a further improvement of this utility model, an emergency vent pipe for the desulfurization tower circulating tank vent gas collection main is provided between the desulfurization tower circulating tank vent gas collection pipe and the desulfurization tower circulating tank vent gas buffer tank, and a control valve for the desulfurization tower circulating tank vent gas collection main is provided on the emergency vent pipe.

[0013] As a further improvement of this utility model, a regulating and control valve for the negative pressure system is provided between the desulfurization tower circulating tank escaping gas collection pipe and the desulfurization tower circulating tank escaping gas buffer tank.

[0014] As a further improvement of this utility model, a condensate drain valve for the desulfurization tower circulating tank escaping gas collection pipe is provided between the desulfurization tower circulating tank escaping gas buffer tank and the desulfurization tower circulating tank escaping gas collection main pipe.

[0015] As a further improvement of this utility model, a flame arrester for the atmospheric vent pipe of the desulfurization tower circulation tank is provided at the top of the atmospheric vent pipe of the desulfurization tower circulation tank.

[0016] The beneficial effects of this utility model are as follows:

[0017] During normal operation of the desulfurization tower, the coal gas carried by the desulfurization liquid flowing from top to bottom in the circulation tank accumulates in the circulation tank. It is then collected through the desulfurization tower circulation tank escaping gas collection pipe, through the escaping gas collection main pipe, and into the negative pressure system after being regulated by the regulating valve. The escaping gas is then collected into the escaping gas buffer tank and enters the negative pressure coal gas pipeline before the blower and after the electrostatic precipitator, thus preventing the coal gas from escaping.

[0018] The control valves on the atmospheric vent pipe and the escaping gas collection pipe of the desulfurization tower circulating tank allow for switching of the escaping coal gas between these two pipes without affecting the normal operation of the desulfurization tower. If blockage is detected in either pipe, the steam purging valves can be opened to clean the pipeline and maintain its unobstructed flow. The dual vent pipe system at the desulfurization tower circulating tank exhaust port effectively solves the problem of timely escape and collection of entrained coal gas within the HPF wet desulfurization tower circulating tank. This ensures the accuracy of the liquid level reading in the circulating tank and eliminates the risk of catastrophic accidents caused by blockage at a single exhaust port, such as desulfurization liquid level distortion or desulfurization liquid entering the coal gas pipeline. This promotes the long-term, safe, and stable operation of the desulfurization system and is particularly suitable for the safe operation of desulfurization systems in extremely cold regions during winter.

[0019] This utility model features a simple structure, reasonable design, low manufacturing cost, easy assembly, disassembly, and maintenance, and is highly practical. It is currently in production and use with good results. It is particularly suitable for the safe operation of desulfurization systems in extremely cold regions during winter, solving the problem of frequent fluctuations in desulfurization tower liquid levels in winter in these regions. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] In the diagram: 101, First desulfurization tower; 102, Second desulfurization tower; 103, Third desulfurization tower; 104, Fourth desulfurization tower; 2, Atmospheric vent pipe of the desulfurization tower circulation tank; 3, Escape gas collection pipe of the desulfurization tower circulation tank; 4, Control valve of the atmospheric vent pipe of the desulfurization tower circulation tank; 5, Control valve of the escape gas collection pipe of the desulfurization tower circulation tank; 6, Steam purging valve of the atmospheric vent pipe of the desulfurization tower circulation tank; 7, Steam purging valve of the escape gas collection pipe of the desulfurization tower circulation tank; 8, Flame arrester of the atmospheric vent pipe of the desulfurization tower circulation tank; 9, Emergency vent pipe of the main escape gas collection pipe of the desulfurization tower circulation tank; 10, Control valve of the emergency vent pipe of the main escape gas collection pipe of the desulfurization tower circulation tank; 11, Adjustment control valve of the negative pressure system inlet of the main escape gas collection pipe of the desulfurization tower circulation tank; 12, Condensate drain valve of the main escape gas collection pipe of the desulfurization tower circulation tank; 13, Escape gas buffer tank of the desulfurization tower circulation tank; 14, Negative pressure removal pipeline. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0023] like Figure 1 As shown, a typical wet desulfurization system consists of four desulfurization towers, with three operating and one on standby under normal circumstances. An atmospheric connection pipe is installed at the top of the circulation tank of the HPF wet desulfurization tower to balance the internal pressure of the circulation tank and ensure the normal operation of the desulfurization liquid circulation pump.

[0024] This utility model, based on the original HPF wet desulfurization process design, incorporates a double vent pipe at the exhaust port of the desulfurization tower circulation tank. The utility model mainly includes a first desulfurization tower 101, a second desulfurization tower 102, a third desulfurization tower 103, and a fourth desulfurization tower 104; an atmospheric vent pipe 2 for the desulfurization tower circulation tank; an escape gas collection pipe 3 for the desulfurization tower circulation tank; a control valve 4 for the atmospheric vent pipe 4; and a control valve 5 for the escape gas collection pipe 5. The system consists of: 6. Steam purging valve for the vent pipe; 7. Steam purging valve for the desulfurization tower circulating tank vent gas collection pipe; 8. Flame arrester for the desulfurization tower circulating tank atmospheric vent pipe; 9. Emergency vent pipe for the desulfurization tower circulating tank vent gas collection main pipe; 10. Control valve for the emergency vent pipe for the desulfurization tower circulating tank vent gas collection main pipe; 11. Adjustment and control valve for the negative pressure system inlet of the desulfurization tower circulating tank vent gas collection main pipe; 12. Condensate drain valve for the desulfurization tower circulating tank vent gas collection main pipe; and 13. vent gas buffer tank for the desulfurization tower circulating tank.

[0025] The various components of this utility model cooperate with each other and are connected by valves to form a unified assembly. The material is Q235B carbon steel.

[0026] The atmospheric vent pipe 2 of the desulfurization tower circulation tank is a DN200 pipe made of Q235 steel with a wall thickness of 8mm-10mm. Its body is connected and fixed to the desulfurization tower body by a fixed bracket, and its height must be 4 meters higher than the highest platform at the top of the desulfurization tower.

[0027] The desulfurization tower circulating tank escaping gas collection pipe 3 is a DN250 pipe made of Q235 steel with a wall thickness of 8mm-10mm. The escaping gases from the first desulfurization tower 101 and the second desulfurization tower 102 are combined into one pipe, and the escaping gases from the third desulfurization tower 103 and the fourth desulfurization tower 104 are combined into one pipe. Finally, the escaping gases from the first desulfurization tower 101, the second desulfurization tower 102, the third desulfurization tower 103, and the fourth desulfurization tower 104 are combined into one main pipe and enter the negative pressure system.

[0028] The control valve 4 of the atmospheric vent pipe of the desulfurization tower circulation tank is a DN200 stainless steel gate valve. It is located at the root of the atmospheric vent pipe 2 of the desulfurization tower circulation tank and is connected to the tee of the exhaust port of the desulfurization tower circulation tank. It is used to switch the operation of the atmospheric vent pipe 2 of the desulfurization tower circulation tank.

[0029] The control valve 5 of the desulfurization tower circulation tank escaping gas collection pipe is a DN250 stainless steel gate valve. It is located at the end of the desulfurization tower circulation tank escaping gas collection pipe 3 and is connected to the desulfurization tower circulation tank exhaust port tee via a reducer. It is used to switch the corresponding desulfurization tower circulation tank escaping gas collection pipe 3 into operation.

[0030] The steam purging valve 6 of the atmospheric vent pipe of the desulfurization tower circulation tank is located after the control valve 4 of the atmospheric vent pipe of the desulfurization tower circulation tank. It is a DN25 cast steel gate valve, which is drawn from the nearest low-pressure steam pipeline and is used to purge and clean the atmospheric vent pipe 2 of the desulfurization tower circulation tank.

[0031] The steam purging valve 7 of the desulfurization tower circulating tank escaping gas collection pipe is located after the control valve 5 of the desulfurization tower circulating tank escaping gas collection pipe. It is a DN25 cast steel gate valve, which is drawn from the nearest low-pressure steam pipeline and is used to purge and clean the desulfurization tower circulating tank escaping gas collection pipe 3.

[0032] The flame arrester 8 of the atmospheric vent pipe of the desulfurization tower circulation tank is located at a suitable position at the top of the atmospheric vent pipe 2 of the desulfurization tower circulation tank. Its inner diameter is the same as that of the atmospheric vent pipe 2 of the desulfurization tower circulation tank. When installing, it is necessary to consider the ease of maintenance, cleaning and replacement. It is mainly used to prevent fires caused by lightning strikes.

[0033] The emergency vent pipe 9 of the desulfurization tower circulating tank vent gas collection main is distributed before the control valve 10 of the emergency vent pipe of the circulating tank vent gas collection main of the first desulfurization tower 101, the second desulfurization tower 102, the third desulfurization tower 103 and the fourth desulfurization tower 104. It is made of Q235, has a pipe diameter of DN250, and is 4 meters above the platform. It is mainly used for the venting of vent gas into the air in emergency situations.

[0034] The emergency venting control valve 10 of the desulfurization tower circulating tank escaping gas collection main pipe is located at the root of the emergency venting pipe 9 of the desulfurization tower circulating tank escaping gas collection main pipe. It is generally a DN250 manual or electric cast steel gate valve, mainly used for venting escaping gas into the air in emergency situations.

[0035] The regulating and control valve 11 of the desulfurization tower circulating tank escaping gas collection main pipe into the negative pressure system is located after the emergency vent pipe 9 of the desulfurization tower circulating tank escaping gas collection main pipe. It is generally a DN250 automatic regulating valve, mainly used to regulate and control the flow rate of escaping coal gas entering the negative pressure system after the electric precipitator before the blower.

[0036] The condensate drain valve 12 of the desulfurization tower circulating tank escaping gas collection main pipe is located between the emergency vent pipe 9 of the desulfurization tower circulating tank escaping gas collection main pipe and the negative pressure system regulating control valve 11 of the desulfurization tower circulating tank escaping gas collection main pipe. It is generally a DN50 valve and auxiliary pipeline, which is connected to the nearest condensate collection tank. It is mainly used to drain the condensate in the desulfurization tower circulating tank escaping gas collection pipe 3.

[0037] The desulfurization tower circulating tank escaping gas buffer tank 13 is located after the negative pressure system regulating and control valve 11 in the desulfurization tower circulating tank escaping gas collection main pipe. It is generally a cylindrical storage tank with a volume of 6-8 m³. 3 Made of Q235, it is mainly used to buffer the escape gas, collect and discharge the condensate and other impurities carried by the escape gas. The outlet of the escape gas buffer tank 13 is connected to the negative pressure pipeline of the gas area through the negative pressure pipeline 14, so that the escape gas finally enters the negative pressure gas pipeline after the electric precipitator before the blower.

[0038] During normal operation of the desulfurization tower, the coal gas carried by the desulfurization liquid flowing from top to bottom in the circulation tank accumulates in the circulation tank. It is then collected through the desulfurization tower circulation tank escaping gas collection pipe 3, through the escaping gas collection main pipe, into the negative pressure system regulating control valve 11, and then into the escaping gas buffer tank 13. This enters the negative pressure coal gas pipeline before the blower and after the electrostatic precipitator, thus preventing the coal gas from escaping.

[0039] The control valve 4 of the atmospheric vent pipe of the desulfurization tower circulation tank and the control valve 5 of the escaping gas collection pipe of the desulfurization tower circulation tank can switch the escaping coal gas between the atmospheric vent pipe 2 and the escaping gas collection pipe 3 of the desulfurization tower circulation tank without affecting the normal operation of the desulfurization tower. When blockage is found in the atmospheric vent pipe 2 or the escaping gas collection pipe 3 of the desulfurization tower circulation tank, the steam purging valve 6 of the atmospheric vent pipe of the desulfurization tower circulation tank and the steam purging valve 7 of the escaping gas collection pipe of the desulfurization tower circulation tank can be opened to clean the pipeline and keep it unobstructed.

[0040] Because the gas escaping from the desulfurization tower contains impurities such as naphthalene, which easily condenses and precipitates, especially in winter when temperatures are low, it can clog the escaping gas pipeline during operation. When the escaping gas collection pipe 3 of the desulfurization tower circulation tank is blocked or requires maintenance, close the control valve 5 of the desulfurization tower circulation tank escaping gas collection pipe and open the atmospheric vent pipe 2 of the desulfurization tower circulation tank. Temporarily switch the gas from the exhaust port of the circulation tank to the atmospheric vent pipe 2 of the desulfurization tower circulation tank to ensure the normal liquid level in the circulation tank. After the fault or problem of the escaping gas collection pipe 3 of the desulfurization tower circulation tank is resolved, switch the exhaust port of the desulfurization tower circulation tank back to the escaping gas collection pipe 3, and the escaping gas from the exhaust port enters the negative pressure system. When blockage is found in the atmospheric vent pipe 2 or the escaping gas collection pipe 3 of the desulfurization tower circulation tank, the steam purging valve 6 and the steam purging valve 7 of the atmospheric vent pipe of the desulfurization tower circulation tank escaping gas collection pipe can be opened to clean the pipeline and keep it unobstructed.

[0041] The desulfurization tower circulation tank exhaust port is equipped with dual vent pipes, which effectively solves the problem of timely release and collection of coal gas entrained in the HPF wet desulfurization tower circulation tank. This avoids environmental problems caused by coal gas leakage in the circulation tank, ensures the accuracy of the liquid level value in the desulfurization tower circulation tank, and reduces the risk of serious accidents such as desulfurization tower liquid level distortion and desulfurization liquid entering the coal gas pipeline caused by blockage of a single exhaust port. This is conducive to the long-term, safe and stable operation of the desulfurization system, and is especially suitable for the safe operation of the desulfurization system in winter in extremely cold northern regions.

Claims

1. A HPF wet desulphurization tower circulating tank double exhaust port diffuser device, characterized in that: The system includes a first desulfurization tower (101), a second desulfurization tower (102), a third desulfurization tower (103), and a fourth desulfurization tower (104). Each of the first desulfurization tower (101), the second desulfurization tower (102), the third desulfurization tower (103), and the fourth desulfurization tower (104) is equipped with an atmospheric vent pipe (2) for the desulfurization tower circulation tank. At the bottom of the atmospheric vent pipe (2) for the desulfurization tower circulation tank is equipped with a control valve (4) for the atmospheric vent pipe for the desulfurization tower circulation tank, a control valve (5) for the escaping gas collection pipe for the desulfurization tower circulation tank, and a steam vent pipe for the atmospheric vent pipe for the desulfurization tower circulation tank. The bottom of the atmospheric vent pipe (2) of the desulfurization tower circulation tank between the first desulfurization tower (101) and the second desulfurization tower (102) is connected to the atmospheric vent pipe (2) of the desulfurization tower circulation tank between the third desulfurization tower (103) and the fourth desulfurization tower (104). The two connections are connected to the desulfurization tower circulation tank vent gas buffer tank (13) through the desulfurization tower circulation tank vent gas collection pipe (3). A steam purging valve (7) of the desulfurization tower circulation tank vent gas collection pipe is provided between the control valves (5) of the two desulfurization tower circulation tank vent gas collection pipes.

2. The double exhaust port diffuser device of the circulating tank of the HPF wet desulfurization tower according to claim 1, characterized in that: An emergency vent pipe (9) for the desulfurization tower circulating tank vent gas collection main is provided between the desulfurization tower circulating tank vent gas collection pipe (3) and the desulfurization tower circulating tank vent gas buffer tank (13), and a control valve (10) for the desulfurization tower circulating tank vent gas collection main is provided on the desulfurization tower circulating tank vent gas collection main emergency vent pipe (9).

3. The double exhaust port diffuser device of the circulating tank of the HPF wet desulfurization tower according to claim 1, characterized in that: A regulating valve (10) for the desulfurization tower circulating tank escaping gas collection pipe (3) and the desulfurization tower circulating tank escaping gas buffer tank (13) is provided between the desulfurization tower circulating tank escaping gas collection main pipe and the negative pressure system regulating valve (10).

4. The double exhaust port diffuser device of the circulating tank of the HPF wet desulfurization tower according to claim 1, characterized in that: A condensate drain valve (12) is provided between the desulfurization tower circulating tank escaping gas collection pipe (3) and the desulfurization tower circulating tank escaping gas buffer tank (13).

5. The double exhaust port diffuser device of a circulating tank of a HPF wet desulfurization tower according to any one of claims 1-4, characterized in that: The top of the atmospheric vent pipe (2) of the desulfurization tower circulation tank is equipped with a flame arrester (8).

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