Tail gas condensation and recovery treatment device

Abstract

The utility model relates to the field of tail gas treatment, and discloses a tail gas condensation recovery treatment device which comprises a primary condensation device, a secondary condensation device, a spray tower, a liquid storage tank, a water pump and a compressor, the secondary condensation device is communicated with the primary condensation device and the spray tower through pipelines, and the compressor is communicated with the secondary condensation device. The spray tower is communicated with the liquid storage tank through a water pump, and an air leakage detection device is further arranged on the secondary condensing device. The tail gas recycling device has the following advantages and effects that methanol and hydrogen chloride in tail gas are recycled by utilizing the primary condensing device and the secondary condensing device, residual hydrogen chloride gas in the tail gas enters the spray tower along the pipeline, and then liquid in the liquid storage tank is pumped by the water pump to react with the residual hydrogen chloride in the tail gas; the tail gas grading treatment is realized, hydrogen chloride and methanol in the tail gas can be well recovered, and the pollution of the tail gas to the environment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas treatment technology, and in particular to an exhaust gas condensation and recovery treatment device. Background Technology

[0002] Methyltrimethoxysilane is an organic compound with the molecular formula CH3Si(CH3O)3. It is mainly used as a crosslinking agent for room temperature vulcanizing silicone rubber, as well as a surface treatment agent for glass fibers and a surface treatment agent for reinforced plastic laminates.

[0003] The preparation of methyltrimethoxysilane generates tail gas, which contains a large amount of methanol and hydrogen chloride. Direct emission of gases containing methanol and hydrogen chloride will pollute the environment. Therefore, a tail gas condensation and recovery treatment device is proposed to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of this invention is to provide a tail gas condensation and recovery treatment device that can recover methanol and hydrogen chloride in stages to achieve the effect of protecting the environment.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a tail gas condensation and recovery treatment device, including a primary condensation device, a secondary condensation device, a spray tower, a liquid storage tank, a water pump and a compressor. The secondary condensation device is connected to the primary condensation device and the spray tower through pipelines. The compressor is connected to the secondary condensation device. The spray tower and the liquid storage tank are connected through a water pump. The secondary condensation device is also equipped with a leak detection device.

[0006] By adopting the above technical solution, the tail gas generated during the production of methyltrimethoxysilane enters the primary condensation unit through a pipeline to recover methanol from the tail gas. Then, the tail gas continues to enter the secondary condensation unit through a pipeline. The compressor pressurizes the gas entering the secondary condensation unit to recover hydrogen chloride from the tail gas. The remaining hydrogen chloride gas in the tail gas enters the spray tower through a pipeline. Then, a water pump draws liquid from the storage tank to react with the remaining hydrogen chloride in the tail gas, realizing the staged treatment of the tail gas. This can effectively recover hydrogen chloride and methanol from the tail gas, reducing the pollution of the tail gas to the environment. At the same time, since hydrogen chloride is highly corrosive, a leak detection device can be used to detect the sealing of the connection between the secondary condensation unit and the pipeline, preventing the leakage of hydrogen chloride gas due to severe corrosion after long-term use of the pipeline, and prompting staff to repair and replace it in time.

[0007] A further feature of this invention is that the primary condensing device includes a condensing shell, and a stainless steel condenser is installed inside the condensing shell.

[0008] By adopting the above technical solution, the tail gas generated during the production of methyltrimethoxysilane enters the condenser shell one through a pipeline, and the methanol in the tail gas is condensed and recovered by the stainless steel condenser under normal pressure.

[0009] A further feature of this invention is that the secondary condensation device includes a second condensation shell connected to the first condensation shell, a graphite condenser installed inside the second condensation shell, and a thermometer and a pressure gauge installed on the second condensation shell.

[0010] A further feature of this invention is that the compressor and the condenser housing are connected.

[0011] By adopting the above technical solution, since hydrogen chloride gas is different from methanol gas, the gas in the second condenser shell is pressurized by a compressor, and then the tail gas is condensed by a graphite condenser to realize the recovery of hydrogen chloride. The thermometer and pressure gauge can monitor the temperature and pressure in the second condenser shell.

[0012] A further feature of this invention is that the first condenser shell, the second condenser shell, and the spray tower are all connected to a drain pipe.

[0013] A further feature of this invention is that the inner bottom wall of the condenser shell, the condenser shell, and the spray tower are all sloped, and the drain pipe is connected to the lower end of the slope.

[0014] By adopting the above technical solution, it is convenient to collect the recovered liquid from the condenser shell 1, condenser shell 2, and spray tower before it is discharged.

[0015] A further feature of this invention is that the storage tank contains a NaOH solution.

[0016] By adopting the above technical solution, after condensation and recovery by the primary condenser and the secondary condenser, a small amount of hydrogen chloride gas may still exist in the exhaust gas. The NaOH solution in the storage tank is pumped out by a water pump to react with the hydrogen chloride in the exhaust gas to produce sodium chloride and water, thereby further reducing the hydrogen chloride content in the exhaust gas and reducing the pollution of the exhaust gas to the environment.

[0017] A further feature of this invention is that the air leakage detection device includes a sealing cover installed on the second condenser housing and sleeved outside the pipe, an inlet pipe and an outlet pipe connected to the sealing cover, and an indicator test strip installed on the inner wall of the sealing cover.

[0018] A further feature of this invention is that the sealing cover is a transparent cover.

[0019] A further feature of this invention is that the indicator paper includes, but is not limited to, litmus paper.

[0020] By adopting the above technical solution, the pipeline is connected to the second condenser shell, and gas containing hydrogen chloride is introduced into the second condenser shell for condensation and recovery. Since hydrogen chloride is highly corrosive, when the corrosion between the pipeline and the second condenser shell is severe and hydrogen chloride gas escapes, it will dissolve in the water in the sealing cover to form hydrochloric acid. The hydrochloric acid reacts with litmus paper, causing the litmus paper to turn red. When the litmus paper in the sealing cover is observed to change color, it can remind maintenance personnel to repair or replace the pipeline in time to avoid hydrogen chloride gas escaping and polluting the environment.

[0021] The beneficial effects of this utility model are:

[0022] 1. The tail gas generated during the production of methyltrimethoxysilane enters the primary condenser through a pipeline to recover methanol. The tail gas then continues through a pipeline to the secondary condenser, where a compressor pressurizes the gas to recover hydrogen chloride. The remaining hydrogen chloride gas in the tail gas enters the spray tower through a pipeline, where a water pump draws liquid from the storage tank to react with the remaining hydrogen chloride in the tail gas. This staged treatment of the tail gas effectively recovers hydrogen chloride and methanol, reducing environmental pollution.

[0023] 2. Due to the strong corrosiveness of hydrogen chloride, a leak detection device can be used to check the connection between the secondary condenser and the pipeline.

[0024] The sealing performance should be checked to prevent severe corrosion of the pipeline after prolonged use, which could lead to the escape of hydrogen chloride gas. Staff should be reminded to repair or replace the pipeline in a timely manner. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 is a schematic diagram of the structure of this utility model;

[0027] Figure 2 is a schematic diagram of the connection structure between the secondary condensation device and the leakage detection device of this utility model.

[0028] In the diagram, 1. Primary condenser; 2. Secondary condenser; 21. Condenser shell II; 22. Graphite condenser; 23. Thermometer; 24. Pressure gauge; 3. Spray tower; 4. Liquid storage tank; 5. Water pump; 6. Drain pipe; 7. Compressor; 8. Leakage detection device; 81. Sealing cover; 82. Water inlet pipe; 83. Water outlet pipe; 84. Indicator strip. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0030] Please see Figure 1-2 This utility model provides a tail gas condensation and recovery treatment device, including a primary condensation device 1, a secondary condensation device 2, a spray tower 3, a liquid storage tank 4, a water pump 5, and a compressor 7. The secondary condensation device 2 is connected to the primary condensation device 1 and the spray tower 3 through pipelines. The compressor 7 is connected to the secondary condensation device 2. The spray tower 3 and the liquid storage tank 4 are connected through the water pump 5. The secondary condensation device 2 is also equipped with a leak detection device 8.

[0031] The tail gas produced during the production of methyltrimethoxysilane enters the primary condenser 1 through a pipeline to recover methanol from the tail gas. The tail gas then continues through pipeline 2 into the secondary condenser 2. Compressor 7 pressurizes the gas entering the secondary condenser 2 to recover hydrogen chloride from the tail gas. The remaining hydrogen chloride gas in the tail gas enters the spray tower 3 through a pipeline. Then, water pump 5 draws liquid from the storage tank 4 to react with the remaining hydrogen chloride in the tail gas, achieving staged treatment of the tail gas. This effectively recovers hydrogen chloride and methanol from the tail gas, reducing environmental pollution. Simultaneously, because hydrogen chloride is highly corrosive, a leak detection device 8 can detect the sealing of the connection between the secondary condenser 2 and the pipeline, preventing severe corrosion of the pipeline after prolonged use and thus preventing the escape of hydrogen chloride gas, prompting timely maintenance and replacement by personnel.

[0032] The primary condensation unit 1 includes a condensation shell 1, inside which a stainless steel condenser is installed. The exhaust gas generated during the production of methyltrimethoxysilane enters the condensation shell 1 through a pipeline. Under normal pressure, the stainless steel condenser condenses the methanol in the exhaust gas.

[0033] Condensation recovery is performed.

[0034] The secondary condensation device 2 includes a second condensation shell 21 connected to the first condensation shell, a graphite condenser 22 installed inside the second condensation shell 21, and a thermometer 23 and a pressure gauge 24 installed on the second condensation shell 21. The compressor 7 is connected to the second condensation shell 21. Since hydrogen chloride gas is different from methanol gas, the compressor 7 pressurizes the gas in the second condensation shell 21, and then the graphite condenser 22 condenses the exhaust gas to achieve hydrogen chloride recovery. The thermometer 23 and the pressure gauge 24 can monitor the temperature and pressure in the second condensation shell 21.

[0035] The first condenser shell, the second condenser shell 21, and the spray tower 3 are all connected to a drain pipe 6. The inner bottom wall of the first condenser shell, the second condenser shell 21, and the spray tower 3 are all designed as slopes. The drain pipe 6 is connected to the lower end of the slope, which facilitates the discharge of the recovered liquid from the first condenser shell, the second condenser shell 21, and the spray tower 3.

[0036] The storage tank 4 contains NaOH solution. After being condensed and recovered by the primary condenser 1 and the secondary condenser 2, a small amount of hydrogen chloride gas may still exist in the exhaust gas. The water pump 5 is used to extract the NaOH solution from the storage tank 4 and react it with the hydrogen chloride in the exhaust gas to produce sodium chloride and water, further reducing the hydrogen chloride content in the exhaust gas and reducing the pollution of the exhaust gas to the environment.

[0037] The leak detection device 8 includes a sealing cover 81 installed on the condenser housing 21 and covering the outside of the pipe, an inlet pipe 82 and an outlet pipe 83 connected to the sealing cover 81, and an indicator paper 84 installed on the inner wall of the sealing cover 81. The sealing cover 81 is a transparent cover, and the indicator paper 84 includes, but is not limited to, litmus paper. The pipe is connected to the condenser housing 21 and introduces gas containing hydrogen chloride into the condenser housing 21 for condensation and recovery. Since hydrogen chloride is highly corrosive, when the corrosion between the pipe and the condenser housing 21 is severe and hydrogen chloride gas escapes, it will dissolve in the water in the sealing cover 81 to form hydrochloric acid. The hydrochloric acid reacts with the litmus paper, causing the litmus paper to turn red. When the litmus paper inside the sealing cover 81 is observed to change color, it can remind maintenance personnel to repair or replace the pipe in time to prevent hydrogen chloride gas from escaping and polluting the environment.

Claims

1. A tail gas condensation and recovery treatment device, characterized in that, It includes a primary condenser (1), a secondary condenser (2), a spray tower (3), a liquid storage tank (4), a water pump (5), and a compressor (7). The secondary condenser (2) is connected to the primary condenser (1) and the spray tower (3) through a pipeline. The compressor (7) is connected to the secondary condenser (2). The spray tower (3) and the liquid storage tank (4) are connected through the water pump (5). The secondary condenser (2) is also equipped with a leak detection device (8).

2. The exhaust gas condensation and recovery treatment device according to claim 1, characterized in that: The primary condensing device (1) includes a condensing shell, and a stainless steel condenser is installed inside the condensing shell.

3. The exhaust gas condensation and recovery treatment device according to claim 2, characterized in that: The secondary condenser (2) includes a second condenser (21) connected to the first condenser, a graphite condenser (22) installed in the second condenser (21), and a thermometer (23) and a pressure gauge (24) installed on the second condenser (21).

4. The exhaust gas condensation and recovery treatment device according to claim 3, characterized in that: The compressor (7) is connected to the condenser housing (21).

5. The exhaust gas condensation and recovery treatment device according to claim 4, characterized in that: The first condenser shell, the second condenser shell (21), and the spray tower (3) are all connected to a drain pipe (6).

6. The exhaust gas condensation and recovery treatment device according to claim 5, characterized in that: The inner bottom walls of the first condenser shell, the second condenser shell (21), and the spray tower (3) are all sloped, and the drain pipe (6) is connected to the lower end of the slope.

7. The exhaust gas condensation and recovery treatment device according to claim 6, characterized in that: The storage tank (4) contains NaOH solution.

8. The exhaust gas condensation and recovery treatment device according to claim 7, characterized in that: The leak detection device (8) includes a sealing cover (81) installed on the condenser housing (21) and sleeved on the outside of the pipe, an inlet pipe (82) and an outlet pipe (83) connected to the sealing cover (81), and an indicator test paper (84) installed on the inner wall of the sealing cover (81).

9. The exhaust gas condensation and recovery treatment device according to claim 8, characterized in that: The sealing cover (81) is a transparent cover.

10. The exhaust gas condensation and recovery treatment device according to claim 9, characterized in that: The indicator strips (84) include, but are not limited to, litmus paper.

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