Liquid chlorine tail gas adsorption treatment device

Abstract

The utility model discloses a kind of liquid chlorine tail gas adsorption treatment device belong to liquid chlorine production technical field, including adsorption unit, rotary change-over valve group, regeneration unit and control system;The adsorption unit is constituted by two structures same adsorption tower parallelly connected;The rotary change-over valve group includes two three-way plug valves;The regeneration unit includes hot nitrogen generator, regeneration pipeline and tail gas incinerator;The control system is constituted by PLC controller, temperature sensor and pressure transmitter, and PLC controller is connected temperature sensor, pressure transmitter and the electric actuator of three-way plug valve respectively by signal line.This application realizes air inlet path and air outlet path switching by stopcock by first adsorption tower and second adsorption tower, one tower adsorbs while another tower regenerates, under the premise of guaranteeing tail gas continuous stable processing, greatly improve the utilization of adsorbent, reduce the replacement cost of adsorbent.

Description

Technical Field

[0001] This utility model belongs to the field of liquid chlorine production technology, specifically relating to a liquid chlorine tail gas adsorption treatment device. Background Technology

[0002] Liquid chlorine is an important chemical raw material widely used in many chemical production processes. However, the production and use of liquid chlorine generate tail gases containing harmful components such as chlorine. If these tail gases are released directly without effective treatment, they will severely damage the atmospheric environment, cause serious harm to the human respiratory system and skin, and may even lead to safety accidents.

[0003] Currently, common methods for treating liquid chlorine tail gas include water absorption, alkaline absorption, and adsorption. Water absorption suffers from low absorption efficiency and is prone to secondary pollution; alkaline absorption, while effective, consumes large amounts of alkali, incurs high operating costs, and causes severe equipment corrosion; traditional adsorption methods use adsorbents with limited adsorption capacity and are difficult to regenerate, failing to meet the requirements for long-term stable operation and urgently need improvement. Therefore, developing a highly efficient, easily regenerable, and reliable liquid chlorine tail gas adsorption treatment device is of significant practical importance. Summary of the Invention

[0004] To address the aforementioned problems, this utility model discloses a liquid chlorine tail gas adsorption treatment device, which achieves efficient and stable purification treatment of liquid chlorine tail gas.

[0005] To achieve the above objectives, the specific technical solution of this application is as follows:

[0006] A liquid chlorine tail gas adsorption treatment device includes an adsorption unit, a rotary reversing valve group, a regeneration unit, and a control system.

[0007] The adsorption unit is composed of two adsorption towers with the same structure connected in parallel, including a first adsorption tower and a second adsorption tower. The inner cavity of the adsorption tower is divided into an inlet chamber, an adsorption chamber and an outlet chamber along the axial direction.

[0008] The adsorption chamber is filled with activated alumina adsorbent, and its two ends are fixed by stainless steel porous support plates; a guide plate is provided between the air inlet chamber and the adsorption chamber and is welded to the inner wall of the tower.

[0009] The rotary reversing valve assembly includes two three-way plug valves, namely the first three-way plug valve and the second three-way plug valve, each of which includes three ports: A, B, and C.

[0010] The A port of the first three-way plug valve is connected to the exhaust gas input pipe, the B port is connected to the air inlet chamber of the first adsorption tower through the first pipeline, and the C port is connected to the air inlet chamber of the second adsorption tower through the second pipeline.

[0011] The A port of the second three-way plug valve is connected to the purified gas output pipe, the B port is connected to the gas outlet chamber of the first adsorption tower through the third pipe, and the C port is connected to the gas outlet chamber of the second adsorption tower through the fourth pipe.

[0012] The regeneration unit includes a hot nitrogen generator, regeneration pipelines, and a tail gas incinerator;

[0013] The control system consists of a PLC controller, a temperature sensor, and a pressure transmitter. The PLC controller is connected to the temperature sensor, the pressure transmitter, and the electric actuator of the three-way plug valve via signal lines.

[0014] Based on the above technical features, the outlet of the hot nitrogen generator is divided into two paths, which are connected to the B port of the first three-way plug valve via the fifth pipeline and to its C port via the sixth pipeline; the inlet end of the regeneration pipeline is connected to the B and C ports of the second three-way plug valve, and the outlet end is connected to the tail gas incinerator.

[0015] Based on the above technical features, furthermore, the temperature sensor is embedded in the inner wall of the adsorption chamber, and the pressure transmitter is installed on the outer wall of the outlet chamber.

[0016] Based on the above technical features, furthermore, a gas-liquid separator and a gas cooler are installed in series on the regeneration pipeline; the gas-liquid separator is a vertical cylindrical body with cyclone guide vanes inside; the gas cooler is a stainless steel tube heat exchanger with the cooling water inlet located at the bottom and the outlet located at the top.

[0017] Based on the above technical features, preferably, the guide plate of the adsorption tower is longitudinally arranged at the junction of the air inlet chamber and the adsorption chamber. The guide plate is a fan-shaped stainless steel plate with a 30° inclination angle. The guide plate forms an angle of 15-20° with the horizontal plane, and the bottom edge is 1 / 5 of the tower diameter from the bottom of the tower.

[0018] Compared with the prior art, the beneficial effects of this application are as follows:

[0019] This application achieves the switching of the inlet and outlet gas paths through a plug valve between the first and second adsorption towers. While one tower is adsorbing, the other tower is regenerating. Under the premise of ensuring continuous and stable treatment of tail gas, this significantly improves the utilization rate of the adsorbent and reduces the replacement cost of the adsorbent.

[0020] The adsorption chamber is filled with activated alumina adsorbent, which has high adsorption selectivity and large adsorption capacity for chlorine. It can maintain good adsorption performance over a wide range of temperature and humidity, effectively removing harmful components such as chlorine and hydrogen chloride from liquid chlorine tail gas. The baffle between the air inlet chamber and the adsorption chamber in the adsorption tower guides the airflow to penetrate the adsorbent layer evenly, eliminating channeling and further purifying the chlorine content in the gas.

[0021] The regeneration unit is equipped with a gas-liquid separator and a gas cooler, which can effectively separate the condensate generated during the regeneration process and cool the high-temperature gas to prevent the high-temperature gas from causing adverse effects on subsequent treatment equipment and the environment. At the same time, it can improve the completeness and safety of exhaust gas incineration and reduce secondary pollution emissions.

[0022] The fan-shaped baffle structure forms an angle of 15-20° with the horizontal plane, and the bottom edge is 1 / 5 of the tower diameter from the bottom of the tower. This allows the exhaust gas to form a uniform and stable airflow distribution at the junction of the inlet chamber and the adsorption chamber, avoiding airflow short-circuiting and local scouring of the adsorbent. This improves the mass transfer efficiency of the adsorption process. Compared with structures without baffles or with ordinary baffles, the adsorption efficiency is improved by about 15%-20%. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a liquid chlorine tail gas adsorption treatment device according to the present invention;

[0024] List of identifiers in attached diagrams:

[0025] 1. Adsorption tower; 1a. First adsorption tower; 1b. Second adsorption tower; 101. Inlet chamber; 102. Adsorption chamber; 103. Outlet chamber; 104. Activated alumina adsorbent; 105. Stainless steel porous support plate; 106. Guide plate; 2. Three-way stopcock valve; 201. First three-way stopcock valve; 202. Second three-way stopcock valve; 3. Tail gas inlet pipe; 4. First pipeline; 5. Second pipeline; 6. Purified gas outlet pipe; 7. Third pipeline; 8. Fourth pipeline; 9. Hot nitrogen generator; 10. Regeneration pipeline; 11. Tail gas incinerator; 12. Fifth pipeline; 13. Sixth pipeline; 14. PLC controller; 15. Temperature sensor; 16. Pressure transmitter; 17. Gas-liquid separator; 18. Gas cooler. Detailed Implementation

[0026] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0027] It should be noted that the terms "upper," "lower," "left," "right," "front," and "rear" used in the following description refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Furthermore, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figure 1 As shown, a liquid chlorine tail gas adsorption treatment device includes an adsorption unit, a rotary reversing valve group, a regeneration unit, and a control system.

[0029] The adsorption unit consists of two identical adsorption towers 1 connected in parallel, including a first adsorption tower 1a and a second adsorption tower 1b. The adsorption tower is a horizontal cylindrical container made of 304 stainless steel, and its inner cavity is divided along the axial direction into an air inlet chamber 101, an adsorption chamber 102 and an air outlet chamber 103. The adsorption chamber 102 is filled with activated alumina adsorbent 104, and its two ends are fixed by stainless steel porous support plates 105.

[0030] A guide plate 106 is provided between the air inlet chamber 101 and the adsorption chamber 102, and the guide plate 106 is welded to the inner wall of the tower body; preferably, the guide plate 106 of the adsorption tower 1 is longitudinally arranged at the junction of the air inlet chamber 101 and the adsorption chamber 102, and the guide plate 106 is a fan-shaped stainless steel plate with a 30° inclination angle, the guide plate 106 forms an angle of 15-20° with the horizontal plane, and the bottom edge is 1 / 5 of the tower diameter from the bottom of the tower.

[0031] The rotary reversing valve group includes two three-way plug valves 2, namely the first three-way plug valve 201 and the second three-way plug valve 202, each three-way plug valve including three ports: A, B, and C;

[0032] The A port of the first three-way plug valve 201 is connected to the exhaust gas input pipe 3, the B port is connected to the air inlet chamber 101 of the first adsorption tower 1a through the first pipe 4, and the C port is connected to the air inlet chamber 101 of the second adsorption tower 1b through the second pipe 5.

[0033] The A port of the second three-way plug valve 202 is connected to the purified gas output pipe 6, the B port is connected to the gas outlet chamber 103 of the first adsorption tower 1a through the third pipe 7, and the C port is connected to the gas outlet chamber 103 of the second adsorption tower 1b through the fourth pipe 8.

[0034] The regeneration unit includes a hot nitrogen generator 9, a regeneration pipeline 10, and a tail gas incinerator 11. A gas-liquid separator 17 and a gas cooler 18 are connected in series on the regeneration pipeline 10. The gas-liquid separator 17 is a vertical cylindrical body with cyclone guide vanes inside. The gas cooler 18 is a stainless steel tubular heat exchanger with a cooling water inlet at the bottom and an outlet at the top. The outlet of the hot nitrogen generator 9 is divided into two paths, which are connected to the B port of the first three-way stopcock valve 201 via the fifth pipeline 12 and to its C port via the sixth pipeline 13. The inlet end of the regeneration pipeline 10 is connected to the B and C ports of the second three-way stopcock valve 202, and the outlet end is connected to the tail gas incinerator 11.

[0035] The control system consists of a PLC controller 14, a temperature sensor 15, and a pressure transmitter 16. The temperature sensor 15 is embedded in the inner wall of the adsorption chamber 102, and the pressure transmitter 16 is installed on the outer wall of the outlet chamber 103. The PLC controller 14 is connected to the electric actuators of the temperature sensor 15, the pressure transmitter 16, and the three-way stopcock valve 2 via signal lines.

[0036] Working principle:

[0037] Normal adsorption process: Liquid chlorine tail gas enters port A of the first three-way stopcock valve through the tail gas inlet pipe. The PLC controller controls the valve core of the first three-way stopcock valve to rotate, connecting port A with port B. The tail gas then enters the inlet chamber of the first adsorption tower through the first pipeline. Under the action of the guide plate, the tail gas is evenly distributed and flows into the adsorption chamber, making full contact with the activated alumina adsorbent filled in the adsorption chamber. Harmful components such as chlorine are adsorbed by the adsorbent. The purified gas enters port B of the second three-way stopcock valve through the outlet chamber and the third pipeline. Under the action of the PLC controller, the valve core of the second three-way stopcock valve rotates, connecting port B with port A. The purified gas is finally discharged from the device through the purified gas outlet pipe, realizing the purification treatment of the tail gas. When the first adsorption tower is saturated, the PLC controller controls the rotary reversing valve group to switch according to the preset adsorption time or the pressure change signal in the adsorption tower, allowing the tail gas to enter the second adsorption tower for adsorption treatment. At the same time, the first adsorption tower enters the regeneration preparation state.

[0038] Regeneration Process: Once the adsorption tower is saturated, the PLC controller initiates the regeneration program. The hot nitrogen generator produces hot nitrogen, which is divided into two streams. These streams flow through the fifth and sixth pipelines to the B and C ports of the first three-way stopcock valve, respectively. In regeneration mode, the valve core of the first three-way stopcock valve rotates, allowing the hot nitrogen to enter the inlet chambers of the first and second adsorption towers (where the corresponding adsorption towers have completed their adsorption process). The hot nitrogen flows counter-currently with the activated alumina adsorbent within the adsorption chamber, desorbing harmful components such as chlorine adsorbed on the adsorbent. The desorbed chlorine-containing gas then flows through the outlet chamber and the fourth pipeline to the C port of the second three-way stopcock valve (where the valve is in the corresponding regeneration state). It then flows sequentially through the gas-liquid separator and gas cooler via the regeneration pipeline. After the condensate is separated, the gas enters the tail gas incinerator for high-temperature combustion and decomposition, converting it into harmless gas that is released into the atmosphere. Simultaneously, the PLC controller monitors the temperature and pressure parameters during the regeneration process in real time to ensure a safe and stable regeneration process. Once the adsorbent has been regenerated, the PLC controller controls the rotary reversing valve group to switch back to the adsorption state, and the regenerated adsorption tower is put back into adsorption operation, realizing the recycling of the adsorbent.

[0039] It should be noted that the accompanying drawings merely illustrate the technical concept of the present invention and should not be used to limit the scope of protection of the present invention. For those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and all such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A liquid chlorine tail gas adsorption treatment device, characterized in that: It includes an adsorption unit, a rotary reversing valve assembly, a regeneration unit, and a control system; The adsorption unit is composed of two adsorption towers (1) with the same structure connected in parallel, including a first adsorption tower (1a) and a second adsorption tower (1b). The inner cavity of the adsorption tower is divided into an inlet chamber (101), an adsorption chamber (102) and an outlet chamber (103) along the axial direction. The adsorption chamber (102) is filled with activated alumina adsorbent (104), and its two ends are fixed by stainless steel porous support plates (105); a guide plate (106) is provided between the air inlet chamber (101) and the adsorption chamber (102), and is welded to the inner wall of the tower. The rotary reversing valve group includes two three-way plug valves (2), namely the first three-way plug valve (201) and the second three-way plug valve (202), each three-way plug valve including three ports: A, B and C; The A port of the first three-way plug valve (201) is connected to the exhaust gas input pipe (3), the B port is connected to the air inlet chamber (101) of the first adsorption tower (1a) through the first pipe (4), and the C port is connected to the air inlet chamber (101) of the second adsorption tower (1b) through the second pipe (5). The A port of the second three-way plug valve (202) is connected to the purified gas output pipe (6), the B port is connected to the gas outlet chamber (103) of the first adsorption tower (1a) through the third pipe (7), and the C port is connected to the gas outlet chamber (103) of the second adsorption tower (1b) through the fourth pipe (8). The regeneration unit includes a hot nitrogen generator (9), a regeneration pipeline (10), and a tail gas incinerator (11). The control system consists of a PLC controller (14), a temperature sensor (15), and a pressure transmitter (16). The PLC controller (14) is connected to the electric actuators of the temperature sensor (15), the pressure transmitter (16), and the three-way plug valve (2) via signal lines.

2. The liquid chlorine tail gas adsorption treatment device according to claim 1, characterized in that: The outlet of the hot nitrogen generator (9) is divided into two paths, which are connected to the B port of the first three-way plug valve (201) via the fifth pipeline (12) and to its C port via the sixth pipeline (13); the inlet end of the regeneration pipeline (10) is connected to the B and C ports of the second three-way plug valve (202), and the outlet end is connected to the tail gas incinerator (11).

3. The liquid chlorine tail gas adsorption treatment device according to claim 1, characterized in that: The temperature sensor (15) is embedded in the inner wall of the adsorption chamber (102), and the pressure transmitter (16) is installed on the outer wall of the outlet chamber (103).

4. The liquid chlorine tail gas adsorption treatment device according to claim 1, characterized in that: A gas-liquid separator (17) and a gas cooler (18) are connected in series on the regeneration pipeline (10); the gas-liquid separator (17) is a vertical cylindrical body with cyclone guide vanes inside; the gas cooler (18) is a stainless steel tube heat exchanger with the cooling water inlet located at the bottom and the outlet located at the top.

5. The liquid chlorine tail gas adsorption treatment device according to claim 1, characterized in that: The guide plate (106) of the adsorption tower (1) is longitudinally arranged at the junction of the air inlet chamber (101) and the adsorption chamber (102). The guide plate (106) is a fan-shaped stainless steel plate with a 30° inclination angle. The guide plate (106) forms an angle of 15-20° with the horizontal plane, and the bottom edge is 1 / 5 of the tower diameter from the bottom of the tower.

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