Hydrogen chloride tail gas recovery device

Abstract

The utility model relates to the technical field of tail gas recovery, in particular to a hydrogen chloride tail gas recovery device which comprises a tail gas treatment box, a gas conveying pipe and a filtering assembly arranged on the gas conveying pipe and used for cleaning and filtering hydrogen chloride tail gas, the gas conveying pipe is installed on the tail gas treatment box, and a liquid discharging pipe is arranged at the bottom of the tail gas treatment box. The filtering assembly comprises a mounting sleeve communicated with the air conveying pipe, an adjusting valve is arranged at an air inlet pipe opening of the mounting sleeve, a scale plate and a pointing piece are arranged on the adjusting valve, an airflow barrel is detachably mounted in the mounting sleeve and located between the adjusting valve and the air conveying pipe, and a filtering sleeve is arranged on the inner wall of the airflow barrel. Impurities in hydrogen chloride tail gas are cleaned and filtered through the filtering sleeve arranged on the inner wall of the airflow barrel, so that hydrogen chloride gas introduced into the tail gas treatment box does not contain impurities, resource recycling of the hydrogen chloride gas in the tail gas is achieved, and a recycled hydrochloric acid solution cannot be polluted.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas recovery, in particular to a hydrogen chloride tail gas recovery device. Background Art

[0002] Hydrogen chloride is a colorless, non-flammable gas with a very pungent odor. Its specific gravity is greater than that of air. It produces white mist when it comes into contact with humid air. It is easily soluble in water to produce hydrochloric acid.

[0003] A large amount of tail gas containing hydrogen chloride gas is generated in the synthesis workshop and drying workshop of trifluorotoluene. In order to avoid the exhaust gas from polluting the environment and to prevent waste of resources, the tail gas needs to be treated before being discharged into the atmosphere. The commonly used method for recovering the hydrogen chloride tail gas is water absorption method. However, the existing hydrogen chloride tail gas recovery device basically directly sprays the hydrogen chloride tail gas without filtering process, which easily causes impurities contained in the hydrogen chloride tail gas to enter the tail gas treatment box, causing pollution and damage to the surface of the tail gas treatment box, reducing the service life of the hydrogen chloride tail gas recovery device, and also causing pollution to the hydrochloric acid formed after the hydrogen chloride gas is recovered, reducing the quality of the hydrochloric acid. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a hydrogen chloride tail gas recovery device in view of the deficiencies of the above-mentioned prior art.

[0005] The technical solution adopted by the utility model is: a hydrogen chloride tail gas recovery device, comprising a tail gas treatment box and a gas transmission pipe, and a filter assembly arranged on the gas transmission pipe for cleaning and filtering the hydrogen chloride tail gas, the gas transmission pipe is installed on the tail gas treatment box, and a drain pipe is arranged at the bottom of the tail gas treatment box;

[0006] The filter assembly includes a mounting sleeve connected to the air supply pipe, a regulating valve is provided at the air inlet of the mounting sleeve, a scale plate and a pointing member are provided on the regulating valve, an air flow cylinder is detachably installed in the mounting sleeve and between the regulating valve and the air supply pipe, and a filter sleeve is provided on the inner wall of the air flow cylinder.

[0007] Preferably, the outlet of the gas pipe is vertically arranged in the tail gas treatment box, the tail gas treatment box stores adsorption liquid for adsorbing hydrogen chloride gas, and the outlet of the gas pipe is located below the liquid level of the adsorption liquid.

[0008] Preferably, a pressure relief member is provided on the top of the exhaust gas treatment box, and the pressure relief member is used to balance the pressure in the exhaust gas treatment box.

[0009] Preferably, a liquid storage tank is provided at the bottom of the exhaust gas treatment box, and the liquid storage tank is connected to the pipe mouth of the drain pipe, and a control valve is provided between the liquid storage tank and the drain pipe.

[0010] Preferably, a column foot is provided at the bottom of the exhaust gas treatment box.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The utility model can make the hydrogen chloride tail gas flow from the installation sleeve into the gas transmission pipe through the gas flow cylinder, and clean and filter the impurities in the hydrogen chloride tail gas under the action of the filter sleeve arranged on the inner wall of the gas flow cylinder, so that the hydrogen chloride gas adsorbed by the adsorption liquid in the tail gas treatment box does not contain impurities, thereby realizing the resource recovery and utilization of the hydrogen chloride gas in the tail gas, and will not cause pollution to the recovered hydrochloric acid solution.

[0013] 2. The utility model controls the on-off of the hydrogen chloride tail gas in the installation sleeve by adjusting the valve, and can clearly and intuitively display the flow rate of the hydrogen chloride tail gas in the installation sleeve through the cooperation of the scale plate and the pointing member. It has a simple structure and good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of a tail gas treatment box of a hydrogen chloride tail gas recovery device of the utility model;

[0015] Figure 2 It is a three-dimensional structural schematic diagram of a filter assembly of a hydrogen chloride tail gas recovery device of the utility model;

[0016] Figure 3 The utility model is an exploded view of the gas flow cylinder and the filter sleeve of the hydrogen chloride tail gas recovery device.

[0017] Illustration Description:

[0018] 1. Exhaust treatment box; 101. Column base; 2. Air pipe; 3. Filter assembly; 301. Installation sleeve; 302. Adjusting valve; 3021. Scale plate; 3022. Pointing piece; 303. Air flow cylinder; 304. Filter sleeve; 4. Drain pipe; 5. Pressure relief piece; 6. Liquid storage tank; 7. Control valve. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] See also Figure 1 The embodiment of the utility model provides a hydrogen chloride tail gas recovery device, including a tail gas treatment box 1 and a gas pipeline 2 installed thereon, and a filter assembly 3 arranged on the gas pipeline 2 for cleaning and filtering the hydrogen chloride tail gas; the hydrogen chloride tail gas is passed into the filter assembly 3, so that the impurities in the hydrogen chloride tail gas can be cleaned and filtered.

[0022] In some embodiments, see Figure 1 The outlet of the gas pipeline 2 is vertically arranged in the tail gas treatment box 1, and the tail gas treatment box 1 stores an adsorption liquid for adsorbing hydrogen chloride gas, and the outlet of the gas pipeline 2 is located below the liquid level of the adsorption liquid to ensure that the hydrogen chloride tail gas can be fully absorbed by the adsorption liquid.

[0023] In some embodiments, see Figure 1 A pressure relief member 5 is provided on the top of the tail gas treatment box 1; the pressure in the tail gas treatment box 1 is balanced by the pressure relief member 5 to avoid negative pressure in the tail gas treatment box 1, so that the adsorption liquid in the tail gas treatment box 1 can stably adsorb the hydrogen chloride in the hydrogen chloride tail gas.

[0024] In some embodiments, a pressure sensor is provided in the exhaust gas treatment box 1, and the pressure sensor and the pressure relief member 5 are both electrically connected to an external controller;

[0025] The pressure in the exhaust gas treatment box 1 is sensed by a pressure sensor, and the pressure signal is transmitted to the controller, so that the controller can control the opening and closing of the pressure relief valve according to the pressure signal, so that the pressure in the exhaust gas treatment box 1 is in a normal state, avoiding the internal pressure being higher than the pressure in the gas pipeline 2, which affects the absorption of hydrogen chloride exhaust gas by the adsorption liquid.

[0026] In some embodiments, the pressure relief member 5 is a pressure relief valve.

[0027] In some embodiments, see Figure 1 The bottom of the tail gas treatment box 1 is provided with a column foot 101, so as to ensure the stability of the tail gas treatment, which is conducive to the absorption and treatment of the hydrogen chloride gas in the tail gas by the adsorption liquid.

[0028] In some embodiments, see Figure 1 A drain pipe 4 is provided at the bottom of the exhaust gas treatment box 1, a liquid storage tank 6 is provided at the pipe mouth of the drain pipe 4, and a control valve 7 is provided between the liquid storage tank 6 and the drain pipe 4;

[0029] The opening and closing of the drain pipe 4 is controlled by the control valve 7, so that the hydrochloric acid formed by the adsorption of hydrogen chloride gas by the adsorption liquid in the tail gas treatment box 1 can be discharged into the liquid storage tank 6 for storage, thereby realizing the resource recovery and utilization of the hydrogen chloride gas in the tail gas.

[0030] In some embodiments, a water injection pipe is provided on the exhaust gas treatment box 1 so that liquid injection treatment can be performed in the exhaust gas treatment box 1 .

[0031] In some embodiments, the control valve 7 is a one-way solenoid valve, and the control valve 7 is electrically connected to an external controller.

[0032] In some embodiments, see Figure 2 and Figure 3 The filter assembly 3 includes a mounting sleeve 301 connected to the air supply pipe 2, a regulating valve 302 is arranged at the air inlet of the mounting sleeve 301, a scale plate 3021 and a pointing member 3022 are arranged on the regulating valve 302, an air flow cylinder 303 is detachably installed in the mounting sleeve 301 and between the regulating valve 302 and the air supply pipe 2, and a filter sleeve 304 is arranged on the inner wall of the air flow cylinder 303.

[0033] The on-off of the hydrogen chloride tail gas in the installation sleeve 301 is controlled by adjusting the valve 302; the flow rate of the hydrogen chloride tail gas in the installation sleeve 301 can be clearly and intuitively displayed through the cooperation of the scale plate 3021 and the pointing member 3022, with a simple structure and good practicality; the hydrogen chloride tail gas can flow from the installation sleeve 301 into the gas transmission pipe 2 through the gas flow cylinder 303, and the impurities in the hydrogen chloride tail gas are cleaned and filtered under the action of the filter sleeve 304 arranged on the inner wall of the gas flow cylinder 303, so that the hydrogen chloride gas adsorbed by the adsorption liquid entering the tail gas treatment box 1 does not contain impurities, thereby ensuring the quality of the hydrochloric acid solution produced by the recovery of the hydrogen chloride gas.

[0034] In some embodiments, see Figure 3 The air flow cylinder 303 is detachably installed in the installation sleeve 301 and is located between the regulating valve 302 and the air supply pipe 2, so that the impurities filtered in the filter sleeve 304 can be cleaned regularly and the filter sleeve 304 can be replaced at the same time.

[0035] In some embodiments, the filter sleeve 304 is a gas filter membrane, which can filter solid impurities in the exhaust gas.

[0036] In some embodiments, a flange is provided at the air inlet opening of the mounting sleeve 301, and the flange can be sealed and connected to a pipeline for conveying hydrogen chloride tail gas.

[0037] When the utility model works:

[0038] The pipeline for conveying hydrogen chloride tail gas is connected and fixed to the flange of the air inlet of the installation sleeve 301, so that the hydrogen chloride tail gas is passed into the installation sleeve 301, and the regulating valve 302 is opened to allow the hydrogen chloride tail gas carrying impurities to flow through the gas flow cylinder 303, and the impurities in the tail gas are cleaned and filtered through the filter sleeve 304 to ensure that the hydrogen chloride tail gas passed into the tail gas treatment box 1 does not contain impurities. When the hydrogen chloride tail gas is passed into the tail gas treatment box 1, the hydrogen chloride gas contained in the tail gas is recovered and processed under the action of the adsorption liquid. At the same time, through the action of the pressure sensor, the pressure relief valve and the controller, the tail gas treatment box is ensured. 1, the pressure balance is prevented from occurring in the gas transmission pipe 2, which would affect the absorption of the hydrogen chloride gas by the adsorption liquid. When the adsorption liquid is saturated with adsorption, the regulating valve 302 is controlled to cut off the supply of the hydrogen chloride tail gas, and the control valve 7 is opened to inject the hydrochloric acid solution formed in the tail gas treatment box 1 into the liquid storage tank 6 through the drain pipe 4 for storage, and ensure that a part of the hydrochloric acid solution in the tail gas treatment box 1 is retained. At the same time, new adsorption liquid is injected into the tail gas treatment box 1, waiting for the recovery and treatment of the next batch of hydrogen chloride tail gas, thereby realizing the resource recovery and utilization of the hydrogen chloride gas in the tail gas, and will not cause pollution to the recovered hydrochloric acid solution.

[0039] Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements shall fall within the scope of the present invention to be protected.

Claims

1. A hydrogen chloride tail gas recovery device, characterized in that: It includes an exhaust gas treatment box and an air delivery pipe, and a filter assembly arranged on the air delivery pipe for cleaning and filtering the hydrogen chloride exhaust gas. The air delivery pipe is installed on the exhaust gas treatment box, and a drain pipe is arranged at the bottom of the exhaust gas treatment box. The filter assembly includes a mounting sleeve connected to the air supply pipe, a regulating valve is provided at the air inlet of the mounting sleeve, a scale plate and a pointing member are provided on the regulating valve, an air flow cylinder is detachably installed in the mounting sleeve and between the regulating valve and the air supply pipe, and a filter sleeve is provided on the inner wall of the air flow cylinder.

2. A hydrogen chloride tail gas recovery device according to claim 1, characterized in that: The outlet of the gas pipe is vertically arranged in the tail gas treatment box, the tail gas treatment box stores adsorption liquid for adsorbing hydrogen chloride gas, and the outlet of the gas pipe is located below the liquid level of the adsorption liquid.

3. A hydrogen chloride tail gas recovery device according to claim 1, characterized in that: A pressure relief member is disposed on the top of the exhaust gas treatment box, and the pressure relief member is used to balance the pressure in the exhaust gas treatment box.

4. A hydrogen chloride tail gas recovery device according to claim 1, characterized in that: A liquid storage tank is arranged at the bottom of the exhaust gas treatment box, and the liquid storage tank is communicated with the pipe opening of the drain pipe, and a control valve is arranged between the liquid storage tank and the drain pipe.

5. A hydrogen chloride tail gas recovery device according to claim 1, characterized in that: The bottom of the tail gas treatment box is provided with a column foot.

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