Dry vacuum pump tail gas treatment device for laboratory

Abstract

The utility model provides a dry vacuum pump tail gas treatment device for a laboratory, which comprises an adsorption column system, a buffer tank and an alkali washing tank which are sequentially connected through a pipeline, and further comprises a plurality of valves, a gas inlet of the adsorption column system is connected with an exhaust port of the dry vacuum pump through a valve, a gas outlet of the adsorption column system is connected with a gas inlet of the buffer tank through a valve, a gas outlet of the buffer tank is connected with a gas inlet of the alkali washing tank through a valve, and a gas outlet of the alkali washing tank discharges treated tail gas. By collecting and treating the tail gas of the laboratory vacuum pump, environmental pollution and human body injury caused by the tail gas of the laboratory vacuum pump are eliminated.

Description

Technical Field

[0001] The utility model relates to a tail gas treatment device, in particular to a dry vacuum pump tail gas treatment device for laboratories. Background Art

[0002] When the dry vacuum pump used in a chemical laboratory is running, tail gas will be generated. These tail gases may contain toxic and harmful substances. If directly discharged into the air without treatment, it will cause air pollution in the laboratory and harm the health of experimental personnel. Therefore, it is necessary to treat the tail gas discharged by the vacuum pump to eliminate the environmental pollution and human injury caused by the tail gas of the laboratory vacuum pump. Content of the Utility Model

[0003] The purpose of the utility model is to provide a dry vacuum pump tail gas treatment device for laboratories, which can solve the problems of air pollution and human injury caused by the direct discharge of the tail gas of the dry vacuum pump without treatment in the prior art.

[0004] The purpose of the utility model is realized by the following technical solutions:

[0005] The dry vacuum pump tail gas treatment device for laboratories includes an adsorption column system, a buffer tank and an alkali washing tank connected in sequence through pipelines, and also includes several valves; the air inlet of the adsorption column system is connected to the exhaust port of the dry vacuum pump through a valve, the air outlet of the adsorption column system is connected to the air inlet of the buffer tank through a valve, the air outlet of the buffer tank is connected to the air inlet of the alkali washing tank through a valve, and the air outlet of the alkali washing tank discharges the treated tail gas.

[0006] Furthermore, the adsorption column system can be one of a molecular adsorption column, an activated carbon adsorption column and a silica gel adsorption column, or a combination of two or more.

[0007] Furthermore, the adsorption column system includes a molecular sieve adsorption column and an activated carbon adsorption column; a second valve is installed at the air inlet of the molecular sieve adsorption column, and the second valve is connected to the first valve at the exhaust port of the dry vacuum pump through a pipeline; a third valve is installed at the air outlet of the molecular sieve adsorption column, and the third valve is connected to the fourth valve at the air inlet of the activated carbon adsorption column; a fifth valve is installed at the air outlet of the activated carbon adsorption column, and the fifth valve is connected to the sixth valve at the air inlet of the buffer tank.

[0008] Further, a seventh valve is installed at the nitrogen purging port of the buffer tank, and the seventh valve is connected to an external nitrogen output device; an eighth valve is installed at the exhaust port of the buffer tank, and the eighth valve is connected to a twelfth valve installed at the air inlet of the caustic scrubber tank; a drain port is provided at the bottom of the buffer tank, and a ninth valve is installed at the drain port of the buffer tank; an eleventh valve is provided at the exhaust port of the caustic scrubber tank, and a tenth valve is provided at the nitrogen purging port of the caustic scrubber tank; the twelfth valve is connected to a thirteenth valve through a pipeline, serving as the drain port of the caustic scrubber tank.

[0009] Further, the adsorbent in the adsorption column system is one or a combination of two or more of molecular sieve, activated carbon, drying silica gel, zeolite, and kaolin.

[0010] Further, the molecular adsorption column, activated carbon adsorption column or silica gel adsorption column is a single unit, or a series or parallel combination of two or more units.

[0011] Further, the solution in the caustic scrubber tank is one of a dilute caustic solution of sodium hydroxide, a dilute solution of sodium carbonate, or a dilute solution of sodium bicarbonate.

[0012] Further, the caustic scrubber tank can be replaced with an acid scrubber tank, or a combination of an acid and caustic scrubber tank.

[0013] The dry vacuum pump tail gas treatment device for laboratories of the present utility model collects and treats the tail gas of the laboratory vacuum pump, eliminating the environmental pollution and human harm caused by the tail gas of the laboratory vacuum pump. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the dry vacuum pump tail gas treatment device of the present utility model.

[0015] The description of the reference numerals in the drawings is as follows:

[0016] 1. Dry vacuum pump, 2. Molecular sieve adsorption column, 3. Activated carbon adsorption column, 4. Buffer tank, 5. Caustic scrubber tank, 6. Vacuum pump air inlet, 7 - 19. Valves. Detailed Embodiments

[0017] The following describes the embodiments of the present disclosure in detail with reference to the drawings.

[0018] The following describes the embodiments of the present disclosure through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present disclosure from the content disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of them. The present disclosure can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0019] The tail gas treatment device for a laboratory of the present utility model, as Figure 1 shown, includes an adsorption column system, a buffer tank 4, and an alkali washing tank 5 that are sequentially connected by pipelines, and also includes a plurality of valves. The air inlet of the adsorption column system is connected to the exhaust port of a dry vacuum pump 1 through a valve, the air outlet of the adsorption column system is connected to the air inlet of the buffer tank 4 through a valve, the air outlet of the buffer tank 4 is connected to the air inlet of the alkali washing tank 5 through a valve, and the air outlet of the alkali washing tank 5 discharges the treated tail gas.

[0020] Furthermore, the adsorption column system can be one of a molecular adsorption column, an activated carbon adsorption column, and a silica gel adsorption column, or a combination of two or more of them.

[0021] Furthermore, the adsorption column system includes a molecular sieve adsorption column 2 and an activated carbon adsorption column 3. A second valve 8 is installed at the air inlet of the molecular sieve adsorption column 2, and the second valve 8 is connected to a first valve 7 at the exhaust port of the dry vacuum pump 1 through a pipeline. A third valve 9 is installed at the air outlet of the molecular sieve adsorption column 2, and the third valve 9 is connected to a fourth valve 10 at the air inlet of the activated carbon adsorption column 3. A fifth valve 11 is installed at the air outlet of the activated carbon adsorption column 3, and the fifth valve 11 is connected to a sixth valve 12 at the air inlet of the buffer tank 4. A seventh valve 13 is installed at the nitrogen purging port of the buffer tank 4, and the seventh valve 13 is connected to an external nitrogen output device. An eighth valve 14 is installed at the exhaust port of the buffer tank 4, and the eighth valve 14 is connected to a twelfth valve 18 installed at the air inlet of the alkali washing tank 5. A drain port is provided at the bottom of the buffer tank 4, and a ninth valve 15 is installed at the drain port of the buffer tank 4. An eleventh valve 17 is provided at the exhaust port of the alkali washing tank 5, and a tenth valve 16 is provided at the nitrogen purging port of the alkali washing tank 5. The twelfth valve 18 is connected to a thirteenth valve 19 through a pipeline, serving as the drain port of the alkali washing tank 5.

[0022] Further, for the molecular sieve adsorption column 2 and the activated carbon adsorption column 3, the adsorbents inside them can be molecular sieves, activated carbon, or other adsorbents such as drying silica gel, zeolites, kaolin, etc. They can be freely selected and combined according to the different components in the tail gas discharged from the dry vacuum pump 1.

[0023] Further, the molecular adsorption column, activated carbon adsorption column or silica gel adsorption column can be a single adsorption column, or a combination of two or more. The combination of two or more can be in series or in parallel, and can be combined and connected according to actual needs.

[0024] Further, the solution in the alkali washing tank 5 can be a dilute alkali solution of sodium hydroxide, or a dilute solution of sodium carbonate or sodium bicarbonate, which varies according to the different components of acidic gases in the tail gas.

[0025] Further, the alkali washing tank 5 can be an alkali washing tank, or an acid washing tank; it can also be a combination of an acid washing tank and an alkali washing tank, which varies according to the acidity and alkalinity of the gas components in the discharged tail gas.

[0026] The working principle of the vacuum pump tail gas treatment device of the present utility model is as follows:

[0027] The laboratory tail gas containing organic substances, HCl and other waste gases enters the vacuum pump through the air inlet 6 of the dry vacuum pump 1 and is discharged from the exhaust port 7 of the dry vacuum pump 1. The tail gas enters the molecular sieve adsorption column 2 through a pipeline. After being adsorbed by the molecular sieve, part of the polar organic molecule is removed and discharged from the exhaust port of the molecular sieve adsorption column 2. Then it enters the activated carbon adsorption column 3 through a pipeline, and part of the non-polar organic molecules are adsorbed and discharged from the exhaust port of the activated carbon adsorption column 3, and then enters the buffer tank 4 through a pipeline. The buffer tank 4 is used to prevent the liquid in the alkali washing tank 5 from flowing back into the molecular sieve adsorption column 2 and the activated carbon adsorption column 3. The tail gas enters through the air inlet of the buffer tank 4, and after passing through the buffer tank 4, it is discharged from the exhaust port of the buffer tank 4 and enters the alkali washing tank 5 through a pipeline. The tail gas bubbles into the alkali washing tank through the air inlet of the alkali washing tank 5. In the alkali washing tank, acidic gases such as HCl, H2S, HI, SO2 in the tail gas are absorbed by the alkali solution and discharged into the air at a high altitude through the exhaust port of the alkali washing tank 5.

[0028] The nitrogen (N2) purging port of the buffer tank 4 is connected to an external nitrogen output device. Before starting the tail gas treatment or after completing the tail gas treatment, valves 12 and 14 are closed, valves 13 and 15 are opened, and the buffer tank 4 is purged with nitrogen, and the waste gas in the buffer tank 4 is discharged through the drain port. When the tail gas treatment is carried out in the buffer tank 4, valves 13 and 15 are closed, and valves 12 and 14 are opened. When there is excess liquid in the buffer tank 4 that needs to be discharged, valve 15 is opened, and the liquid is discharged from the drain port at the bottom of the buffer tank 4.

[0029] The nitrogen purge port of the caustic scrubber 5 is connected to an external nitrogen output device. Before starting the tail gas treatment or after completing the tail gas treatment, close valve 14, open valve 16 to introduce nitrogen, open valves 17, 18, and 19, and use nitrogen to purge the air or waste gas in the caustic scrubber 5 for safe operation. The inlet of the caustic scrubber 5 is provided at the bottom and can also be used as a drain port. When tail gas treatment is carried out in the caustic scrubber, close valves 19 and 16, and open valves 14, 18, and 17. When the caustic liquid in the caustic scrubber has completely reacted and the caustic liquid needs to be replaced, close valve 14 at the exhaust port of the buffer tank 4, open valves 18 and 19, and drain the liquid in the caustic scrubber completely.

[0030] The vacuum pump tail gas treatment device of the present utility model is a closed and environmentally friendly system, which can prevent tail gas from being directly discharged into the air, polluting the air and harming the health of R & D personnel.

[0031] The tail gas treatment system is composed of a molecular sieve adsorption column, an activated carbon adsorption column, or a silica gel adsorption column, etc. According to the different compositions of the tail gas, it can be a combination of them, or a repeated combination after optional mutual matching, to achieve the purpose of adsorption and purification.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "middle", "length", "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0033] In the present utility model, unless otherwise clearly specified and limited, the first feature being "on" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. The meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly specifically limited.

[0034] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] The above is only to illustrate the implementation manners of the present utility model and is not intended to limit the present utility model. For those skilled in the art, any modifications, equivalent replacements, improvements, etc. made without creative efforts within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Dry vacuum pump tail gas treatment device for laboratory, characterized in that It includes an adsorption column system, a buffer tank, and an alkali washing tank connected in sequence through pipelines, and also includes several valves; the air inlet of the adsorption column system is connected to the exhaust port of a dry vacuum pump through a valve, the air outlet of the adsorption column system is connected to the air inlet of the buffer tank through a valve, the air outlet of the buffer tank is connected to the air inlet of the alkali washing tank through a valve, and the treated tail gas is discharged from the air outlet of the alkali washing tank.

2. The dry vacuum pump tail gas treatment device for a laboratory according to claim 1, characterized in that, The adsorption column system can be one of a molecular adsorption column, an activated carbon adsorption column, and a silica gel adsorption column, or a combination of two or more of them.

3. The dry vacuum pump tail gas treatment device for a laboratory according to claim 2, characterized in that, The adsorption column system includes a molecular sieve adsorption column and an activated carbon adsorption column; a second valve is installed at the air inlet of the molecular sieve adsorption column, and the second valve is connected to the first valve at the exhaust port of the dry vacuum pump through a pipeline; a third valve is installed at the exhaust port of the molecular sieve adsorption column, and the third valve is connected to the fourth valve at the air inlet of the activated carbon adsorption column; a fifth valve is installed at the air outlet of the activated carbon adsorption column, and the fifth valve is connected to the sixth valve at the air inlet of the buffer tank.

4. The dry vacuum pump tail gas treatment device for a laboratory according to claim 1, wherein, A seventh valve is installed at the nitrogen purge port of the buffer tank, and the seventh valve is connected to an external nitrogen output device; an eighth valve is installed at the exhaust port of the buffer tank, and the eighth valve is connected to the twelfth valve installed at the air inlet of the alkali washing tank; a drain port is provided at the bottom of the buffer tank, and a ninth valve is installed at the drain port of the buffer tank; an eleventh valve is provided at the exhaust port of the alkali washing tank, and a tenth valve is provided at the nitrogen purge port of the alkali washing tank; the twelfth valve is connected to a thirteenth valve through a pipeline to serve as the drain port of the alkali washing tank.

5. The dry vacuum pump tail gas treatment device for a laboratory according to claim 2, characterized in that, The adsorbent in the adsorption column system is one or a combination of two or more of molecular sieve, activated carbon, drying silica gel, zeolite, and kaolin.

6. The dry vacuum pump tail gas treatment device for a laboratory according to claim 2, characterized in that, The molecular adsorption column, activated carbon adsorption column, or silica gel adsorption column is a single unit, or a series or parallel combination of two or more units.

7. The dry vacuum pump tail gas treatment device for a laboratory according to claim 1, wherein The solution in the alkali washing tank is one of a dilute alkali solution of sodium hydroxide, a dilute solution of sodium carbonate, or a dilute solution of sodium bicarbonate.

8. The dry vacuum pump tail gas treatment device for a laboratory according to claim 1, characterized in that, The alkali washing tank can be replaced with an acid washing tank, or a combination of an acid and alkali washing tank.

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