Automatic acid gas absorption system in polycarbonate production process

Abstract

The utility model discloses an automatic acid gas absorption system in a polycarbonate production process. The automatic acid gas absorption system comprises a hydrochloric acid tank, a self-adjusting valve group, an acid mist absorption tank and an automatic control system, the self-adjusting valve group is mounted between the hydrochloric acid tank and the acid mist absorption tank; the automatic control system is used for testing the pressure of the hydrochloric acid tank and controlling the opening and closing states of the self-adjusting valve group according to the pressure of the hydrochloric acid tank; a liquid outlet of the hydrochloric acid tank is communicated with a saline water recovery device, and the saline water recovery device is connected to a liquid inlet of the hydrochloric acid tank. The system is mainly applied to the industrial fields of polycarbonate production and the like, and the influence of acid mist formation on production and life is avoided.

Description

Technical Field

[0001] This utility model relates to the field of polycarbonate production, and in particular to an automatic absorption system for acidic gases during the polycarbonate production process. Background Technology

[0002] Acid mist typically refers to a mist-like substance containing acidic substances. In the air, acid mist particles are very small, ranging from 0.1 to 10 μm in diameter, falling between flue gas and water mist, and possessing strong corrosiveness. The emission of acid mist causes the diffusion of acidic fog and gases, which, once released into the atmosphere, cause acid deposition in the atmospheric environment. It not only endangers human health but also corrodes pipe corridors, pipelines, equipment, and instruments, causing production and livelihood losses. Furthermore, it adversely affects the survival of plants and animals, damages buildings and structures, and creates significant safety hazards.

[0003] Due to the need for catalyst recycling during polycarbonate production, a large amount of hydrochloric acid is required to recover the catalyst, resulting in a significant amount of acid mist. Therefore, it is urgent to take effective measures to control acid mist emissions and avoid environmental impact or property damage. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an automatic absorption system for acidic gases in the polycarbonate production process. This system is mainly used in industrial fields such as polycarbonate production to avoid the formation of acid mist and the impact on production and daily life.

[0005] An automatic absorption system for acidic gases during polycarbonate production includes a hydrochloric acid tank, a self-regulating valve assembly, an acid mist absorption tank, and an automatic control system. The self-regulating valve assembly is installed between the hydrochloric acid tank and the acid mist absorption tank. The automatic control system tests the pressure of the hydrochloric acid tank and controls the opening and closing state of the self-regulating valve assembly according to the pressure of the hydrochloric acid tank. The outlet of the hydrochloric acid tank is connected to a brine recovery device, and the brine recovery device is connected back to the inlet of the hydrochloric acid tank.

[0006] Preferably, the hydrochloric acid tank is equipped with a breather valve and a pressure transmitter.

[0007] Preferably, an acid mist absorption device is provided above the acid mist absorption tank. The acid mist absorption device includes a gas chamber and a diffuser tube that are connected from top to bottom. An air intake is provided on the side of the gas chamber and is connected to a self-regulating valve group. A liquid inlet pipe is provided in the gas chamber and the liquid inlet of the liquid inlet pipe is located at the top of the acid mist absorption device.

[0008] Preferably, the diameter of the lower outlet of the inlet pipe is smaller than the diameter of the inlet, and the lower outlet is located below the air intake.

[0009] Preferably, the diffuser tube includes an upper tube, a middle tube, and a lower tube arranged sequentially from top to bottom. The upper tube, middle tube, and lower tube have a Venturi structure, and the liquid inlet tube is located inside the upper tube.

[0010] Preferably, the lower end of the inlet pipe is higher than the upper end of the intermediate pipe.

[0011] Preferably, the self-regulating valve assembly includes a first switching valve on the hydrochloric acid tank side, a regulating valve located in the middle, and a second switching valve on the acid mist absorption tank side, with a third switching valve disposed between the front end of the first switching valve and the rear end of the second switching valve.

[0012] Preferably, an acid mist absorption pump is provided between the acid mist absorption tank and the brine recovery device, and the acid mist absorption pump is equipped with a three-way valve, which switches between connecting the acid mist absorption tank, the brine recovery device and the acid mist absorption pump.

[0013] Preferably, a fourth switching valve is provided between the acid mist absorption tank and the acid mist absorption pump, a fifth switching valve is provided between the acid mist absorption pump and the brine recovery device, and a sixth switching valve is provided between the brine recovery device and the acid mist absorption tank.

[0014] Beneficial effects

[0015] In chemical production processes, hydrochloric acid solution generates acid mist when heated, causing the pressure in the hydrochloric acid tank to gradually rise. When the pressure reaches 1.5 kPa, the automatic acid mist control system is triggered, and the interlocking self-regulating valve opens. The acid mist then enters the acid mist absorption device and subsequently the acid mist absorption tank through the pipeline. The acid mist absorption tank uses caustic soda solution to absorb the acid mist, controlling the hydrochloric acid tank pressure between 0.05 and 3.0 kPa. This effectively achieves automatic pressure control of the hydrochloric acid tank, preventing the formation of acid mist and its subsequent overflow and environmental impact. The brine generated from absorbing the acid mist is recycled and reused. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the acid mist absorption device.

[0019] 1. Acid mist absorption tank; 2. Acid mist absorption device; 2-1. Liquid inlet; 2-2. Air inlet; 2-3. Liquid inlet pipe; 2-4. Lower end of liquid inlet pipe; 2-5. Diffuser pipe; 2-6. Gas chamber; 3. Acid mist absorption pump; 4. Hydrochloric acid tank; 5. Breathing valve; 6. Pressure transmitter; 7. Self-regulating valve group; 8. Automatic control system; 9. Brine recovery device; 10. Fourth switch valve; 11. Fifth switch valve; 12. Sixth switch valve; 13. Seventh switch valve. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] like Figure 1-2 As shown, this utility model discloses an automatic acid gas absorption system in the polycarbonate production process. The system includes, from left to right, a hydrochloric acid tank 4, a self-regulating valve group 7, an acid mist absorption tank 1, and a brine recovery device 9. An acid mist absorption pump 3 is installed between the acid mist absorption tank 1 and the brine recovery device 9, and a fourth switching valve 10 is installed between the acid mist absorption tank 1 and the acid mist absorption pump 3. All components are connected by pipelines. The hydrochloric acid tank 4 is equipped with a breather valve 5 and a pressure transmitter 6. The self-regulating valve group 7 is communicatively connected to the automatic control system 8, employing intelligent control to start and stop based on the hydrochloric acid tank pressure, avoiding energy consumption from long-term operation, reducing manual operation, and lowering enterprise labor costs.

[0022] An acid mist absorption device 2 is installed above the acid mist absorption tank 1. The acid mist absorption device 2 includes a gas chamber 2-6 and a diffuser pipe 2-5 connected from top to bottom. An air intake 2-2 is located on the side of the gas chamber 2-6, and the air intake 2-2 is connected to a self-regulating valve assembly 7. An inlet pipe 2-3 is installed inside the gas chamber, with its inlet 2-1 located at the top of the acid mist absorption device 2. The diameter of the lower outlet of the inlet pipe 2-3 is smaller than the diameter of the inlet 2-1, and the lower outlet is located below the air intake 2-2. The diffuser pipe 2-5 includes an upper pipe, a middle pipe, and a lower pipe arranged sequentially from top to bottom. The upper pipe, middle pipe, and lower pipe have a Venturi structure, and the inlet pipe 2-3 is located inside the upper pipe. The lower end 2-4 of the inlet pipe is positioned higher than the upper end of the middle pipe.

[0023] The acid mist absorption tank 1 is circulated with a caustic soda solution. The solution is ejected at high pressure through the lower end 2-4 of the inlet pipe, creating a negative pressure in the upper part of the diffuser 2-5, drawing in the acid mist. The drawn-in acid mist mixes with the caustic soda solution in the middle part of the diffuser 2-5, then gradually decreases in speed and increases in pressure as it passes through the lower part of the diffuser 2-5, ultimately being transported to its designated destination. This process simultaneously accelerates the flow rate of the acid mist within the pipeline, increasing the mixing and reaction rate between the acid mist and the caustic soda solution, thereby enhancing the acid mist absorption effect. The vacuum jet principle is used to achieve acid mist absorption; it is simple and practical.

[0024] The self-regulating valve assembly 7 includes a first switching valve 7-1, a regulating valve 7-4, and a second switching valve 7-3 installed on the conveying pipeline between the hydrochloric acid tank outlet and the acid mist absorption device inlet. An emergency pipeline is also provided between the hydrochloric acid tank outlet and the acid mist absorption device inlet, and a third switching valve 7-2 is installed on the emergency pipeline.

[0025] The acid mist absorption pump 3 is equipped with a three-way valve group, which includes a fifth switch valve 11, a sixth switch valve 12 and a seventh switch valve 13. Through the switching combination of several switch valves, the acid mist absorption tank 1, the brine recovery device 9 and the acid mist absorption pump 3 are switched and connected.

[0026] In chemical production processes, hydrochloric acid solution generates acid mist when heated, causing the pressure in the hydrochloric acid tank to gradually rise. An acid mist absorption pressure interlock value of 1.5 kPa is set (this can be adjusted according to actual conditions). When the pressure reaches 1.5 kPa, the automatic acid mist control system 8 is triggered, and the interlocked self-regulating valve group 7 opens. The acid mist enters the acid mist absorption tank 1 along the pipeline, where it is absorbed by a caustic soda solution. The pressure in the hydrochloric acid tank is controlled between 0.05 and 3.0 kPa, effectively achieving automatic pressure control of the hydrochloric acid tank, preventing acid mist formation and subsequent overflow that could impact the environment. The brine generated from the acid mist absorption is recycled and reused. The flow of caustic soda solution inside the acid mist absorption tank creates negative pressure, increasing the flow rate of acid mist in the pipeline, enhancing the mixing effect and reaction rate of the acid mist and caustic soda solution, and thus strengthening the acid mist absorption effect.

[0027] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. An automatic acid gas absorption system in a polycarbonate production process, characterized by, It includes a hydrochloric acid tank, a self-regulating valve assembly, an acid mist absorption tank, and an automatic control system; the self-regulating valve assembly is installed between the hydrochloric acid tank and the acid mist absorption tank, and the automatic control system tests the pressure of the hydrochloric acid tank and controls the opening and closing state of the self-regulating valve assembly according to the pressure of the hydrochloric acid tank; the outlet of the hydrochloric acid tank is connected to a brine recovery device, and the brine recovery device is connected back to the inlet of the hydrochloric acid tank.

2. The automatic acid gas absorption system in a polycarbonate production process according to claim 1, characterized in that, The hydrochloric acid tank is equipped with a breather valve and a pressure transmitter.

3. The automatic acid gas absorption system in a polycarbonate production process according to claim 1, characterized in that, An acid mist absorption device is installed above the acid mist absorption tank. The acid mist absorption device includes a gas chamber and a diffuser tube that are connected from top to bottom. An air inlet is provided on the side of the gas chamber and is connected to a self-regulating valve group. A liquid inlet pipe is provided in the gas chamber and the liquid inlet of the liquid inlet pipe is located at the top of the acid mist absorption device.

4. The automatic acid gas absorption system in a polycarbonate production process according to claim 3, characterized in that, The diameter of the lower outlet of the inlet pipe is smaller than the diameter of the inlet, and the lower outlet is located below the air intake.

5. The automatic acid gas absorption system in a polycarbonate production process according to claim 3, characterized in that, The diffuser tube includes an upper tube, a middle tube, and a lower tube arranged sequentially from top to bottom. The upper tube, middle tube, and lower tube have a Venturi structure, and the liquid inlet tube is located inside the upper tube.

6. The automatic acid gas absorption system in a polycarbonate production process according to claim 5, characterized in that, The lower end of the inlet pipe is higher than the upper end of the middle pipe.

7. The automatic acid gas absorption system in a polycarbonate production process according to claim 1, characterized in that, The self-regulating valve assembly includes a first switching valve on the hydrochloric acid tank side, a regulating valve in the middle, and a second switching valve on the acid mist absorption tank side. A third switching valve is provided between the front end of the first switching valve and the rear end of the second switching valve.

8. The automatic acid gas absorption system in a polycarbonate production process according to claim 1, characterized in that, An acid mist absorption pump is installed between the acid mist absorption tank and the brine recovery device. The acid mist absorption pump is equipped with a three-way valve, which switches between connecting the acid mist absorption tank, the brine recovery device, and the acid mist absorption pump.

9. The automatic acid gas absorption system in a polycarbonate production process according to claim 1, characterized in that, A fourth switching valve is provided between the acid mist absorption tank and the acid mist absorption pump, a fifth switching valve is provided between the acid mist absorption pump and the brine recovery device, and a sixth switching valve is provided between the brine recovery device and the acid mist absorption tank.

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