Acetone tail gas recovery device

Abstract

The utility model provides an acetone tail gas recovery device which comprises a tail gas conveying system, an adsorption system, a steam conveying system, a condensation system and a cooling liquid receiving tank, and the tail gas conveying system is connected with the adsorption system used for adsorbing and desorbing acetone tail gas through a valve and a pipeline. Compared with the prior art, the device has the following beneficial effects that the whole equipment system can perform adsorption and desorption in turn by arranging the adsorption system, the recovery rate of the acetone tail gas is also improved while the adsorption effect is ensured, a novel HEA adsorption material is adopted, solid waste and acidic substances are prevented from being generated when the acetone tail gas is adsorbed, and the environmental pollution is avoided. Therefore, the first adsorber and the second adsorber are prevented from being damaged by byproducts, the service life of the first adsorber and the service life of the second adsorber are greatly prolonged, meanwhile, on the basis of the characteristics of the HEA adsorption material, replacement is not needed, and the later maintenance difficulty and the operation cost of the first adsorber and the second adsorber are greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of tail gas recovery equipment, in particular to an acetone tail gas recovery device. Background Art

[0002] Acetone is an organic compound with the chemical formula C3H6O, also known as dimethyl ketone. At room temperature and pressure, acetone is a colorless, transparent liquid with a certain special smell, often described as spicy or slightly fragrant. Acetone has high volatility and flammability, and its chemical properties are relatively active. Acetone is widely used as a solvent due to its good solubility. It can dissolve a variety of oils, resins, rubbers, cellulose derivatives, dyes, oils, waxes, and many other organic and certain inorganic compounds.

[0003] Acetone tail gas recovery equipment refers to environmental protection equipment specially designed for capturing, purifying and recovering waste gas containing acetone components generated in industrial production processes. Such equipment is usually used in pharmaceutical, chemical, electronic, coating, printing, surface treatment and other industries. Acetone is a commonly used solvent or intermediate product. If its exhaust gas is not treated, it will not only cause environmental pollution, but also waste resources. In the actual production process, the composition of acetone tail gas may change due to process fluctuations, raw material changes and other factors, affecting the processing efficiency of the equipment. Therefore, we hope to design an acetone tail gas recovery device with a new structure to solve this problem. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide an acetone tail gas recovery device to solve the problems raised in the above background technology.

[0005] The utility model is realized by the following technical scheme: an acetone tail gas recovery device, comprising: a tail gas delivery system, an adsorption system, a steam delivery system, a condensation system and a coolant receiving tank, wherein the tail gas delivery system is connected to an adsorption system for adsorbing and desorbing acetone tail gas through a valve and a pipeline, and the adsorption system is connected to the condensation system through a pipeline and a valve;

[0006] The adsorption system is connected to a steam delivery system for delivering saturated steam through pipelines and valves, and the condensation system is connected to a coolant receiving tank through pipelines, and the condensation system includes a primary condenser and a secondary condenser;

[0007] The adsorption system includes adsorber 1 and adsorber 2, wherein adsorber 1 and adsorber 2 are arranged side by side, and water washing spray modules are arranged on the upper sides of the inner parts of adsorber 1 and adsorber 2, and the water washing spray modules are connected to the external tap water supply pipe through a valve.

[0008] As a preferred embodiment, the exhaust gas delivery system includes a flame arrester, a fan 1 and a surface cooler, the acetone exhaust gas delivery pipe is provided with a flame arrester before the fan 1, and the acetone exhaust gas delivery pipe is connected to the inlet of the surface cooler 1 through the fan 1.

[0009] As a preferred embodiment, the surface cooler is connected to the inlet and outlet pipes at the lower ends of adsorber 1 and adsorber 2 through an acetone delivery pipe and a baffle butterfly valve, the inlet and outlet pipes at the lower ends of adsorber 1 and adsorber 2 are connected to the inlet end of the primary condenser through a pipeline and a baffle butterfly valve, and the discharge end of the primary condenser is connected to the inlet end of the secondary condenser through a pipeline;

[0010] The discharge end of the secondary condenser is connected to the inlet of the coolant receiving tank through a pipeline. A liquid level meter is installed on the surface of the coolant receiving tank. The arrangement of adsorber 1 and adsorber 2 enables the entire equipment system to adsorb and desorb in turn, thereby ensuring the adsorption effect and also improving the recovery rate of acetone tail gas.

[0011] As a preferred embodiment, a vent sampling valve is provided on the pipeline between the discharge end of the first-stage condenser and the inlet end of the second-stage condenser, and the pipeline between the discharge end of the first-stage condenser and the inlet end of the second-stage condenser is connected through a loop pipe, a baffle-type butterfly valve and a flame arrester, and an acetone delivery pipe between the fan 1.

[0012] As a preferred embodiment, the specifications of the adsorber 1 are the same as those of the adsorber 2, HEA adsorbent material is installed inside the adsorber 1 and the adsorber 2, a breathing valve is provided on the upper side of the adsorber 1 and the adsorber 2, and an inlet pipe is provided on the upper end of the adsorber 1 and the adsorber 2. Compared with activated carbon, activated carbon fiber, etc., HEA adsorbent material has the following advantages:

[0013] (1) Regular spherical appearance, high specific surface area (generally up to 1100㎡ / g or more), and high mechanical strength.

[0014] (2) Humidity has little effect on the adsorption of VOCs, but the water absorption of the surface of activated carbon and activated carbon fiber and humidity will significantly affect their adsorption capacity for VOCs.

[0015] (3) It has no catalytic effect and can adsorb a wide range of objects. It can be used to adsorb and recover chemically active VOCs such as ketones, as well as chlorinated hydrocarbons such as dichloromethane, dichloroethane, trichloroethane, and trichloroethylene.

[0016] (4) It has good physical and chemical stability, is resistant to acids, alkalis and organic solvents, has high thermal stability, high mechanical strength and will not fail as a whole.

[0017] (5) The modified adsorbent is specially synthesized according to the different adsorption targets, and its opening is uniform, which makes it easier to intercept the target to achieve better separation efficiency. At the same time, its adsorption heat is less than 20% of that of activated carbon and carbon fiber.

[0018] As a preferred embodiment, the upper ends of adsorber 1 and adsorber 2 are connected to the saturated steam delivery pipeline through an inlet pipe and a baffle-type butterfly valve, the upper ends of adsorber 1 and adsorber 2 are connected to the output end of surface cooler 2 through an inlet pipe, a baffle-type butterfly valve and a cold air delivery pipe, and the input end of surface cooler 2 is connected to fan 2 through a pipeline.

[0019] After adopting the above technical solution, the beneficial effect of the utility model is: by setting up the adsorption system, the entire equipment system can be adsorbed and desorbed in turn, while ensuring the adsorption effect, the recovery rate of acetone tail gas is also improved;

[0020] The new HEA adsorption material is used to avoid the generation of solid waste and acidic substances when adsorbing acetone tail gas, thereby avoiding the damage of adsorber 1 and adsorber 2 by by-products, greatly improving the service life of adsorber 1 and adsorber 2. At the same time, based on the characteristics of the HEA adsorption material itself, it does not need to be replaced, greatly reducing the difficulty of later maintenance and operating costs of adsorber 1 and adsorber 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 The utility model is a schematic diagram of the overall structure of an acetone tail gas recovery device.

[0023] In the figure, 100-exhaust gas delivery system, 110-flame arrester, 120-blower 1, 130-surface cooler 1;

[0024] 200-adsorption system, 210-adsorber 1, 220-adsorber 2;

[0025] 300-Steam delivery system;

[0026] 400-condensation system, 410-primary condenser, 420-secondary condenser;

[0027] 500 - Coolant receiving tank. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1 The utility model provides a technical solution: an acetone tail gas recovery device, comprising: a tail gas delivery system 100, an adsorption system 200, a steam delivery system 300, a condensation system 400 and a coolant receiving tank, the tail gas delivery system 100 is connected to the adsorption system 200 for adsorbing and desorbing acetone tail gas through valves and pipelines, and the adsorption system 200 is connected to the condensation system 400 through pipelines and valves;

[0030] The adsorption system 200 is connected to a steam delivery system 300 for delivering saturated steam through pipelines and valves, and the condensation system 400 is connected to a coolant receiving tank 500 through pipelines. The condensation system 400 includes a primary condenser 410 and a secondary condenser 420;

[0031] The adsorption system 200 includes adsorber 1 210 and adsorber 2 220. Adsorbers 1 210 and 220 are arranged side by side. Water washing spray modules are arranged on the upper sides of the inner parts of adsorber 1 210 and adsorber 2 220. The water washing spray modules are connected to the external tap water supply pipe through a valve.

[0032] See also Figure 1 The tail gas delivery system 100 includes a flame arrester 110, a fan 120 and a surface cooler. The flame arrester 110 is arranged in front of the acetone tail gas delivery pipe near the fan 120, and the acetone tail gas delivery pipe is connected to the inlet of the surface cooler 130 through the fan 120.

[0033] The surface cooler is connected to the inlet and outlet pipes at the lower ends of adsorber 1 210 and adsorber 2 220 through an acetone delivery pipe and a baffle butterfly valve. The inlet and outlet pipes at the lower ends of adsorber 1 210 and adsorber 2 220 are connected to the inlet end of the primary condenser 410 through a pipeline and a baffle butterfly valve. The discharge end of the primary condenser 410 is connected to the inlet end of the secondary condenser 420 through a pipeline.

[0034] The discharge end of the secondary condenser 420 is connected to the inlet of the coolant receiving tank 500 through a pipeline. A liquid level meter is installed on the surface of the coolant receiving tank 500. The arrangement of adsorber 1 210 and adsorber 2 220 enables the entire equipment system to adsorb and desorb in turn, thereby ensuring the adsorption effect while also improving the recovery rate of acetone tail gas.

[0035] A vent sampling valve is provided on the pipeline between the discharge end of the primary condenser 410 and the inlet end of the secondary condenser 420. The pipeline between the discharge end of the primary condenser 410 and the inlet end of the secondary condenser 420 is connected to the acetone delivery pipe between the flame arrester 110 and the fan 120 through a loop pipe, a baffle butterfly valve and the flame arrester 110.

[0036] The specifications of adsorber 1 210 are the same as those of adsorber 2 220. HEA adsorbent material is installed inside adsorber 1 210 and adsorber 2 220. Breathing valves are provided on the upper sides of adsorber 1 210 and adsorber 2 220. Inlet pipes are provided on the upper ends of adsorber 1 210 and adsorber 2 220. HEA adsorbent material has the following advantages over activated carbon, activated carbon fiber, etc.:

[0037] (1) Regular spherical appearance, high specific surface area (generally up to 1100㎡ / g or more), and high mechanical strength.

[0038] (2) Humidity has little effect on the adsorption of VOCs, but the water absorption of the surface of activated carbon and activated carbon fiber and humidity will significantly affect their adsorption capacity for VOCs.

[0039] (3) It has no catalytic effect and can adsorb a wide range of objects. It can be used to adsorb and recover chemically active VOCs such as ketones, as well as chlorinated hydrocarbons such as dichloromethane, dichloroethane, trichloroethane, and trichloroethylene.

[0040] (4) It has good physical and chemical stability, is resistant to acids, alkalis and organic solvents, has high thermal stability, high mechanical strength and will not fail as a whole.

[0041] (5) The modified adsorbent is specially synthesized according to the different adsorption targets, and its opening is uniform, which makes it easier to intercept the target to achieve better separation efficiency. At the same time, its adsorption heat is less than 20% of that of activated carbon and carbon fiber.

[0042] As the first embodiment of the utility model, a new type of HEA adsorption material is used to avoid the generation of solid waste and acidic substances when adsorbing acetone tail gas, thereby avoiding the damage of adsorber 1 210 and adsorber 2 220 by by-products, greatly improving the service life of adsorber 1 210 and adsorber 2 220. At the same time, based on the characteristics of the HEA adsorption material itself, it does not need to be replaced, which greatly reduces the difficulty of later maintenance and operating costs of adsorber 1 210 and adsorber 2 220.

[0043] See also Figure 1 The upper ends of adsorber 1 210 and adsorber 2 220 are connected to the saturated steam delivery pipeline through an inlet pipe and a baffle butterfly valve. The upper ends of adsorber 1 210 and adsorber 2 220 are connected to the output end of surface cooler 2 through an inlet pipe, a baffle butterfly valve and a cold air delivery pipe. The input end of surface cooler 2 is connected to fan 2 through a pipeline.

[0044] As a second embodiment of the present utility model, based on the above-mentioned first embodiment, in actual use, if the adsorber 1 210 is performing adsorption work, the adsorber 2 220 is in a state of preparing for adsorption, and the tail gas delivery system 100 delivers the dehumidified pre-treated acetone tail gas to the inside of the adsorber 1 210 through the acetone tail gas delivery pipeline through the fan 120 and the surface cooler 130. At the same time, the water washing spray module located inside the upper end of the adsorber 1 210 is turned on (the water washing spray module is a prior art, and its structure is not repeated here). The acetone tail gas entering the adsorber 1 210 is washed with spray water continuously. After the concentration of the acetone tail gas reaches a certain value through detection by an online detector at the exhaust port, the delivery of the acetone tail gas is stopped, and the steam delivery system 300 is opened at the same time, saturated steam is introduced into the adsorber 1 210 for desorption. When the adsorber 1 210 is desorbing, the adsorber 2 220 can be switched to perform adsorption (the switching between the adsorber 1 210 and the adsorber 2 220 is mainly based on the online monitoring data and has nothing to do with the actual production time);

[0045] After the adsorber 1 210 completes desorption, it is transported to the primary condenser 410 and the secondary condenser 420 of the condensation system 400 through the discharge pipe for condensation to form liquid, and is introduced into the coolant receiving tank 500, and finally transported to the distillation tower for distillation and recovery of acetone. When the adsorber 1 210 completes desorption, the fan 2 and the surface cooler 2 are started to continuously transport cold air to the inside of the adsorber 1 210 to cool the inside until the specified temperature is reached, and then the cooling is stopped to wait for the next adsorption cycle. The working process and working principle of the adsorber 2 220 are the same as those of the adsorber 1 210, and the two work alternately (in actual use, the main pipelines at the front ends of the adsorbers 1 210 and 220 are provided with mixing valves to keep the intake volume stable and reduce the concentration, thereby effectively improving the adsorption efficiency and preventing the adsorption performance from being affected by excessive concentration), so that the entire equipment system can adsorb and desorb in turn, while ensuring the adsorption effect. The recovery rate of acetone tail gas is also improved (the various pipelines, valves, instruments, fans, surface coolers, condensers and coolant receiving tanks 500 mentioned above can all adopt existing products and can be selected according to actual use requirements. What is changed in adsorber 1 210 and adsorber 2 220 relative to the existing adsorption tower is the adsorption material. The control system adopts PLC control and is provided with a display panel touch adjustment screen to facilitate human-computer dialogue. The operator can adjust the adsorption time, analysis time and intermittent time according to changes in operating conditions, and the pressure, temperature, flow rate and valve position of the process are displayed in real time. The system has a self-checking function, automatic fault alarm and fault display function. In order to ensure safe and reliable operation, the system adds an emergency discharge system. When the system encounters an abnormal situation, the emergency discharge valve can be opened in an emergency. All electrical and control equipment adopts explosion-proof design with explosion-proof grade EXdⅡBT4, and the control cabinet and electrical cabinet can be placed on site).

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An acetone tail gas recovery device, comprising: An exhaust gas delivery system (100), an adsorption system (200), a steam delivery system (300), a condensation system (400), and a coolant receiving tank, wherein the exhaust gas delivery system (100) is connected to an adsorption system (200) for adsorbing and desorbing acetone exhaust gas through a valve and a pipeline, and the adsorption system (200) is connected to the condensation system (400) through a pipeline and a valve; The adsorption system (200) is connected to a steam delivery system (300) for delivering saturated steam through pipelines and valves, and the condensation system (400) is connected to a coolant receiving tank (500) through pipelines, and the condensation system (400) includes a primary condenser (410) and a secondary condenser (420); The adsorption system (200) includes adsorber 1 (210) and adsorber 2 (220), wherein adsorber 1 (210) and adsorber 2 (220) are arranged side by side, and water washing spray modules are arranged on the upper sides of the inner parts of adsorber 1 (210) and adsorber 2 (220), and the water washing spray modules are connected to an external tap water supply pipe through a valve.

2. An acetone tail gas recovery device as claimed in claim 1, characterized in that: The tail gas delivery system (100) comprises a flame arrester (110), a fan (120) and a surface cooler. The acetone tail gas delivery pipe is provided with the flame arrester (110) before being close to the fan (120). The acetone tail gas delivery pipe is connected to an inlet of the surface cooler (130) through the fan (120).

3. An acetone tail gas recovery device as claimed in claim 2, characterized in that: The surface cooler is connected to the inlet and outlet pipes at the lower ends of adsorber 1 (210) and adsorber 2 (220) through an acetone delivery pipe and a baffle-type butterfly valve; the inlet and outlet pipes at the lower ends of adsorber 1 (210) and adsorber 2 (220) are connected to the inlet end of the primary condenser (410) through a pipeline and a baffle-type butterfly valve; the outlet end of the primary condenser (410) is connected to the inlet end of the secondary condenser (420) through a pipeline; The discharge end of the secondary condenser (420) is connected to the inlet of the cooling liquid receiving tank (500) through a pipeline, and a liquid level meter is installed on the surface of the cooling liquid receiving tank (500).

4. An acetone tail gas recovery device as claimed in claim 3, characterized in that: A vent sampling valve is provided on the pipeline between the discharge end of the primary condenser (410) and the inlet end of the secondary condenser (420), and the pipeline between the discharge end of the primary condenser (410) and the inlet end of the secondary condenser (420) is connected through a loop pipe, a baffle-type butterfly valve and an acetone delivery pipe between the flame arrester (110) and the fan 1 (120).

5. An acetone tail gas recovery device as claimed in claim 1, characterized in that: The specifications of adsorber one (210) are the same as those of adsorber two (220). HEA adsorbent material is installed inside adsorber one (210) and adsorber two (220). Breathing valves are arranged on the upper sides of adsorber one (210) and adsorber two (220). Inlet pipes are arranged on the upper ends of adsorber one (210) and adsorber two (220).

6. An acetone tail gas recovery device as claimed in claim 5, characterized in that: The upper ends of adsorber 1 (210) and adsorber 2 (220) are connected to the saturated steam delivery pipeline through an inlet pipe and a baffle-type butterfly valve. The upper ends of adsorber 1 (210) and adsorber 2 (220) are connected to the output end of surface cooler 2 through an inlet pipe, a baffle-type butterfly valve and a cold air delivery pipe. The input end of surface cooler 2 is connected to fan 2 through a pipeline.

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