Laboratory animal facility exhaust ventilation treatment device and method

Abstract

The present invention discloses an exhaust treatment device and method for an experimental animal room, wherein the device includes an ultraviolet disinfection chamber, a spray chamber, a first reaction chamber, and a second reaction chamber; the ultraviolet disinfection chamber is connected to the exhaust of the experimental animal room, and enters the spray chamber after disinfection, and the outlet of the spray chamber is connected to the first reaction chamber; the outlet water of the spray chamber flows into the second reaction chamber, the outlet pipe of the first reaction chamber is connected to the aeration pipe at the bottom of the second reaction chamber, and an exhaust port is also provided above the second reaction chamber. The method includes: ultraviolet disinfection of the exhaust air, the exhaust air after disinfection is sprayed to remove animal hair, and ammonia is dissolved in water to form ammonia water; the exhaust air after spraying enters the first reaction chamber and is mixed with oxygen and then burned to generate sulfur dioxide; the outlet air containing sulfur dioxide is introduced into the liquid containing ammonia water in the second reaction chamber; sulfur dioxide reacts with ammonia water to generate ammonium sulfite; the aerated gas is discharged through the exhaust port. The exhaust air meets the direct discharge requirements, reduces pollution to the environment, and can be recycled.

Description

Technical Field

[0001] The invention relates to the field of exhaust treatment of experimental animal facilities, and in particular to an exhaust treatment device and method for an experimental animal room. Background Art

[0002] Laboratory animals are widely used in research fields such as pharmaceuticals, medicine, and bioengineering. In order to ensure the quality of laboratory animals, various indicators of laboratory animal facilities must be strictly controlled. Laboratory animals produce harmful gases such as ammonia and hydrogen sulfide, as well as germs and hair during their daily metabolism. At present, air conditioning is used to discharge all of them into the atmosphere, causing environmental pollution.

[0003] The exhaust systems of traditional experimental animal facilities can no longer meet emission requirements. For this reason, the industry has plans to filter and remove odors from the exhaust air before discharging it. However, due to the limitations of exhaust technology, the odor removal effect is often uneven, making it difficult to achieve stable and reliable exhaust gas emission requirements, and there are still risks of pollution.

[0004] Therefore, how to solve the above-mentioned deficiencies in the prior art has become a subject to be studied and solved by the present invention. Summary of the invention

[0005] The purpose of the present invention is to provide an exhaust treatment device and method for an experimental animal room.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] An exhaust treatment device for an experimental animal room comprises an ultraviolet disinfection chamber, a spray chamber, a first reaction chamber and a second reaction chamber which are sequentially arranged along the exhaust flow direction;

[0008] The ultraviolet disinfection chamber has an air inlet connected to the exhaust duct of the experimental animal room, and at least one group of ultraviolet lamps for disinfection are arranged in the ultraviolet disinfection chamber;

[0009] The air outlet of the ultraviolet disinfection chamber is connected to the gas inlet of the spray chamber, and a plurality of spray heads are evenly arranged in the spray chamber, which are used to remove animal hair and dust in the exhaust air by spraying water and dissolve ammonia in the exhaust air in water;

[0010] The gas outlet of the spray chamber is connected to the air inlet of the first reaction chamber, and at least one group of electronic igniters is arranged in the first reaction chamber; it also includes an oxygen supply device, the oxygen supply pipe of the oxygen supply device is connected to the first reaction chamber, and is used to inject pure oxygen into the first reaction chamber;

[0011] The lower part of the spray chamber is connected with the upper part of the second reaction chamber, and the water sprayed in the spray chamber flows downward into the second reaction chamber and accumulates, forming a liquid level in the second reaction chamber; the air outlet pipe of the first reaction chamber is connected with a group of aeration pipes at the bottom of the second reaction chamber, and the aeration pipes are located below the liquid level;

[0012] An exhaust port is also provided above the second reaction chamber.

[0013] According to a further technical solution, the gas outlet of the spray chamber is connected to the air inlet of the first reaction chamber through a first pipeline, a first axial flow fan is connected in series in the first pipeline, and the air outlet side of the first axial flow fan is arranged corresponding to the first reaction chamber, so as to send the exhaust air into the first reaction chamber;

[0014] The oxygen supply pipe of the oxygen supply device is connected to the first pipeline, and the connection point is located at the air outlet side of the first axial flow fan.

[0015] According to a further technical solution, the exhaust port above the second reaction chamber is connected to a second pipeline, a second axial flow fan is connected in series in the second pipeline, and the air inlet side of the second axial flow fan is arranged corresponding to the second reaction chamber for extracting the gas in the second reaction chamber.

[0016] According to a further technical solution, the second pipeline is connected to the air inlet pipe of the experimental animal room.

[0017] According to a further technical solution, in the ultraviolet disinfection chamber, the wavelength of light emitted by the ultraviolet lamp is 250-260 nm.

[0018] A further technical solution also includes an exhaust heat exchanger having two pairs of inlets and outlets, wherein the first pair of inlets and outlets are respectively connected to the exhaust of the experimental animal room and the air inlet of the ultraviolet disinfection room, and the second pair of inlets and outlets are respectively connected to the exhaust of the second reaction chamber and the air inlet of the experimental animal room.

[0019] According to a further technical solution, a sedimentation tank is provided at the bottom of the second reaction chamber, and the sedimentation tank is located below the aeration pipe.

[0020] A further technical solution is to provide a discharge pipeline, which is arranged at the bottom of the second reaction chamber and has a valve for opening and closing the pipeline.

[0021] The present invention also includes a method for exhaust treatment of an experimental animal room, comprising:

[0022] Step 1: Disinfect the exhaust air of the experimental animal room with ultraviolet light. The wavelength of ultraviolet light is 250-260nm and the illumination time is greater than or equal to 10s.

[0023] Step 2: The exhaust air after UV disinfection enters the spray room, and animal hair and dust in the exhaust air are removed by spraying, and the ammonia in the exhaust air is dissolved in water to form ammonia water by spraying;

[0024] Step 3: the exhaust air after spraying enters the first reaction chamber, the first reaction chamber is filled with pure oxygen, and the hydrogen sulfide in the exhaust air and the pure oxygen are burned in the first reaction chamber to generate sulfur dioxide;

[0025] Step 4: directing the outlet air containing sulfur dioxide from the first reaction chamber into the liquid in the second reaction chamber, the liquid coming from the outlet water of the spray chamber, which contains ammonia water;

[0026] The sulfur dioxide reacts with the ammonia water to generate ammonium sulfite after aeration;

[0027] Step 5: The aerated gas leaves the liquid in the second reaction chamber and is discharged through the exhaust port.

[0028] According to a further technical solution, in step five, the gas exhausted from the second reaction chamber is reintroduced into the experimental animal room via a pipeline to achieve air recycling.

[0029] A further technical solution is to regularly discharge the liquid in the second reaction chamber after step 5 to remove the animal hair accumulated at the bottom of the second reaction chamber and to recover the ammonium sulfite solution.

[0030] The terms “first”, “second”, etc. used in this document do not specifically refer to an order or sequence, nor are they used to limit the present case. They are only used to distinguish components or operations described with the same technical terms.

[0031] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0032] The terms “include,” “including,” “have,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0033] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0034] The terms "front", "back", "up", "down", "left", "right", etc. used in this article are all directional terms. In this case, they are only used to illustrate the positional relationship between the various structures, and are not used to limit the protection plan of this case and the specific direction during actual implementation.

[0035] The working principle and advantages of the present invention are as follows:

[0036] Compared with the prior art, the present invention removes animal hair from the exhaust air of the experimental animal room by subjecting the exhaust air of the experimental animal room to ultraviolet disinfection, spraying treatment and a series of chemical reactions in sequence, and performs targeted treatment on ammonia and hydrogen sulfide through chemical reactions, so that the treated exhaust air can not only meet the direct emission requirements and reduce pollution to the environment, but can also be directly sent back to the experimental animal room for recycling, thereby controlling pollution through a closed loop.

[0037] Furthermore, the present invention can also realize the recovery of cold and hot energy in the exhaust air by setting an exhaust heat exchanger (total heat exchanger), and the recovered cold and hot energy can be used for temperature regulation of the experimental animal room, thereby achieving a green energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Attached Figure 1 It is a structural schematic diagram of an exhaust treatment device according to an embodiment of the present invention;

[0039] Attached Figure 2 The figure is a flow chart of an exhaust treatment method according to an embodiment of the present invention.

[0040] In the above drawings: 1. UV disinfection chamber; 11. Air inlet; 12. UV lamp; 13. Air outlet; 2. Spray chamber; 21. Gas inlet; 22. Spray head; 23. Gas outlet; 3. First reaction chamber; 31. Air inlet; 32. Electronic igniter; 33. Oxygen supply device; 34. Air outlet pipe; 4. Second reaction chamber; 41. Liquid level; 42. Aeration pipe; 43. Air outlet; 44. Sedimentation tank; 45. Discharge pipeline; 46. Valve; 5. First pipeline; 6. First axial flow fan; 7. Second pipeline; 8. Second axial flow fan; 9. Exhaust heat exchanger. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0042] Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0043] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0044] See attached Figure 1As shown, an exhaust treatment device for an experimental animal room includes an ultraviolet disinfection chamber 1, a spray chamber 2, a first reaction chamber 3 and a second reaction chamber 4 which are sequentially arranged along the exhaust flow direction.

[0045] The ultraviolet disinfection chamber 1 has an air inlet 11 , which is connected to the exhaust duct of the experimental animal room. At least one group of ultraviolet lamps 12 for disinfection are arranged in the ultraviolet disinfection chamber 1 .

[0046] The air outlet 13 of the ultraviolet disinfection chamber 1 is connected to the gas inlet 21 of the spray chamber 2. The spray chamber 2 is evenly provided with a plurality of spray heads 22 for removing animal hair and dust in the exhaust air by spraying water (water droplets and / or water mist), and dissolving ammonia in the exhaust air in water to form ammonia water. The reaction formula is: NH3+H2O=NH3·H2O.

[0047] The gas outlet 23 of the spray chamber 2 is connected to the air inlet 31 of the first reaction chamber 3, and the first reaction chamber 3 is provided with at least one set of electronic igniters 32; it also includes an oxygen supply device 33, the oxygen supply pipe of the oxygen supply device 33 is connected to the first reaction chamber 3, and is used to inject pure oxygen into the first reaction chamber 3. The electronic igniter 32 is used to make the hydrogen sulfide in the exhaust air burn with oxygen to produce sulfur dioxide. The reaction formula is: 2H2S+3O2=2H2O+2SO2.

[0048] A discharge port may be provided at the bottom of the first reaction chamber 3 for periodically discharging water generated by the reaction.

[0049] The lower part of the spray chamber 2 is connected to the upper part of the second reaction chamber 4, and the water sprayed in the spray chamber 2 flows downward into the second reaction chamber 4 and accumulates, forming a liquid level 41 in the second reaction chamber 4; the outlet pipe 34 of the first reaction chamber 3 is connected to a group of aeration pipes 42 at the bottom of the second reaction chamber 4, and the aeration pipes 42 are located below the liquid level 41; through the setting of the aeration pipes 42, the sulfur dioxide in the exhaust gas of the first reaction chamber 3 can fully react with the ammonia water in the second reaction chamber 4 to generate ammonium sulfite. The reaction formula is: 2NH3·H2O+SO2= (NH4)2SO3+H2O.

[0050] An air pump (not shown) may be provided on the air outlet pipe 34 as required to increase the pressure of the gas entering the aeration pipe 42 .

[0051] An exhaust port 43 is also provided above the second reaction chamber 4 .

[0052] Preferably, the gas outlet 23 of the spray chamber 2 is connected to the air inlet 31 of the first reaction chamber 3 through a first pipeline 5, a first axial flow fan 6 is connected in series in the first pipeline 5, and the air outlet side of the first axial flow fan 6 is arranged corresponding to the first reaction chamber 3, so as to send the exhaust air into the first reaction chamber 3;

[0053] The oxygen supply pipe of the oxygen supply device 33 is connected to the first pipeline 5 , and the connection point is located at the air outlet side of the first axial flow fan 6 .

[0054] Preferably, the exhaust port 43 above the second reaction chamber 4 is connected to a second pipeline 7, in which a second axial flow fan 8 is connected in series, and the air inlet side of the second axial flow fan 8 is arranged corresponding to the second reaction chamber 4, for extracting the gas in the second reaction chamber 4.

[0055] Preferably, the second pipeline 7 is connected to the air inlet pipe of the experimental animal room. With this design, the closed-loop operation of the air in the experimental animal room can be achieved, thereby ensuring that the pollution to the external environment is reduced.

[0056] Preferably, in the ultraviolet disinfection chamber 1, the wavelength of light emitted by the ultraviolet lamp 12 is 250-260 nm.

[0057] Preferably, it also includes an exhaust heat exchanger 9, which is a full-heat heat exchanger with two pairs of inlets and outlets, wherein the first pair of inlets and outlets are respectively connected to the exhaust of the experimental animal room and the air inlet 11 of the ultraviolet disinfection chamber 1, and the second pair of inlets and outlets are respectively connected to the exhaust port 43 of the second reaction chamber 4 and the air inlet of the experimental animal room.

[0058] Preferably, a sedimentation tank 44 is further provided at the bottom of the second reaction chamber 4, and the sedimentation tank 44 is located below the aeration pipe 42. The water-insoluble solid matter such as animal hair removed by spraying falls into the second reaction chamber 4 and is deposited in the sedimentation tank 44.

[0059] Preferably, a discharge pipeline 45 is further provided, and the discharge pipeline 45 is arranged at the bottom of the sedimentation tank 44 of the second reaction chamber 4, and a valve 46 for opening and closing the pipeline is provided on the pipeline, so that the pipeline can be opened regularly to discharge the sediment in the sedimentation tank 44, and the ammonium sulfite solution can be recovered and reused as a fertilizer raw material.

[0060] like Figure 2 As shown, the exhaust treatment method of this embodiment includes:

[0061] Step 1: Perform ultraviolet disinfection on the exhaust air of the experimental animal room, the wavelength of the ultraviolet lamp 12 is 250-260nm, and the illumination time is greater than or equal to 10s;

[0062] Step 2: The exhaust air after UV disinfection enters the spray chamber 2, and animal hair and dust in the exhaust air are removed by spraying, and the ammonia in the exhaust air is dissolved in water to form ammonia water by spraying;

[0063] Step 3: The exhaust air after spraying enters the first reaction chamber 3, in which pure oxygen is injected. The hydrogen sulfide in the exhaust air and the pure oxygen undergo a strong oxidation (combustion) reaction in the first reaction chamber 3 to generate sulfur dioxide.

[0064] Step 4: directing the outlet air containing sulfur dioxide from the first reaction chamber 3 into the liquid in the second reaction chamber 4, the liquid coming from the outlet water of the spray chamber 2, which contains ammonia water;

[0065] The sulfur dioxide reacts with the ammonia water in the liquid to generate ammonium sulfite through aeration;

[0066] Step 5: The aerated gas leaves the liquid in the second reaction chamber 4 and is discharged through the exhaust port 43 .

[0067] Preferably, in step five, the gas exhausted from the second reaction chamber 4 is reintroduced into the experimental animal room via a pipeline to achieve air recycling.

[0068] Preferably, after step 5, the liquid in the second reaction chamber 4 is discharged regularly to remove the animal hair accumulated at the bottom of the second reaction chamber 4 and to recover the ammonium sulfite liquid.

[0069] The present invention removes animal hair from the exhaust air of the experimental animal room by sequentially subjecting the exhaust air of the experimental animal room to ultraviolet disinfection, spraying treatment and a series of chemical reactions, and performs targeted treatment on ammonia and hydrogen sulfide through chemical reactions, so that the treated exhaust air can not only meet the direct emission requirements and reduce pollution to the environment, but can also be directly sent back to the experimental animal room for recycling, thereby controlling pollution through a closed loop.

[0070] At the same time, the exhaust heat exchanger can be set to recover the cold and hot energy in the exhaust air. The recovered cold and hot energy can be used to adjust the temperature of the experimental animal room, thereby achieving a green energy-saving effect.

[0071] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An exhaust treatment device for an experimental animal room, characterized in that: It comprises an ultraviolet disinfection chamber (1), a spray chamber (2), a first reaction chamber (3) and a second reaction chamber (4) which are arranged in sequence along the exhaust air flow direction; The ultraviolet disinfection chamber (1) has an air inlet (11), the air inlet (11) is connected to the exhaust duct of the experimental animal room, and at least one group of ultraviolet lamps (12) for disinfection are arranged in the ultraviolet disinfection chamber (1); The air outlet (13) of the ultraviolet disinfection chamber (1) is connected to the gas inlet (21) of the spray chamber (2), and a plurality of spray heads (22) are evenly arranged in the spray chamber (2) for removing animal hair and dust in the exhaust air by spraying water, and dissolving ammonia in the exhaust air in water; The gas outlet (23) of the spray chamber (2) is in communication with the gas inlet (31) of the first reaction chamber (3), and at least one set of electronic igniters (32) is arranged in the first reaction chamber (3); the electronic igniter (32) is used to cause hydrogen sulfide and oxygen in the exhaust air to undergo a combustion reaction in the first reaction chamber (3) to produce sulfur dioxide; It also includes an oxygen supply device (33), wherein the oxygen supply pipe of the oxygen supply device (33) is connected to the first reaction chamber (3) and is used to inject pure oxygen into the first reaction chamber (3); The lower part of the spray chamber (2) is connected to the upper part of the second reaction chamber (4), and the water sprayed in the spray chamber (2) flows downward into the second reaction chamber (4) and accumulates, forming a liquid level (41) in the second reaction chamber (4); the air outlet pipe (34) of the first reaction chamber (3) is connected to a group of aeration pipes (42) at the bottom of the second reaction chamber (4), and the aeration pipes (42) are located below the liquid level (41); An air outlet (43) is also provided above the second reaction chamber (4).

2. The exhaust treatment device for an experimental animal room according to claim 1, characterized in that: The gas outlet (23) of the spray chamber (2) is connected to the air inlet (31) of the first reaction chamber (3) via a first pipeline (5); a first axial flow fan (6) is connected in series to the first pipeline (5); and the air outlet side of the first axial flow fan (6) is arranged corresponding to the first reaction chamber (3) for sending exhaust air into the first reaction chamber (3); The oxygen supply pipe of the oxygen supply device (33) is connected to the first pipeline (5), and the connection point is located on the air outlet side of the first axial flow fan (6).

3. The exhaust treatment device for an experimental animal room according to claim 1, characterized in that: The exhaust port (43) above the second reaction chamber (4) is connected to a second pipeline (7), a second axial flow fan (8) is connected in series in the second pipeline (7), and the air inlet side of the second axial flow fan (8) is arranged corresponding to the second reaction chamber (4) for extracting the gas in the second reaction chamber (4).

4. The exhaust treatment device for an experimental animal room according to claim 3, characterized in that: The second pipeline (7) is connected to the air inlet pipe of the experimental animal room.

5. The exhaust treatment device for an experimental animal room according to claim 1, characterized in that: It also includes an exhaust heat exchanger (9) having two pairs of inlets and outlets, wherein the first pair of inlets and outlets are respectively connected to the exhaust of the experimental animal room and the air inlet (11) of the ultraviolet disinfection chamber (1), and the second pair of inlets and outlets are respectively connected to the exhaust (43) of the second reaction chamber (4) and the air inlet of the experimental animal room.

6. The exhaust treatment device for an experimental animal room according to claim 1, characterized in that: A sedimentation tank (44) is also provided at the bottom of the second reaction chamber (4), and the sedimentation tank (44) is located below the aeration pipe (42).

7. The exhaust treatment device for an experimental animal room according to claim 1 or 6, characterized in that: A discharge pipeline (45) is also provided. The discharge pipeline (45) is arranged at the bottom of the sedimentation tank (44) of the second reaction chamber (4), and a valve (46) for opening and closing the pipeline is provided on the pipeline.

8. A method for exhaust treatment of an experimental animal room, characterized in that: The method is achieved by the exhaust air treatment device for an experimental animal room according to any one of claims 1 to 7, wherein the exhaust air includes animal hair and dust, and also includes ammonia and hydrogen sulfide; the method comprises: Step 1: Perform ultraviolet disinfection on the exhaust air of the experimental animal room, the wavelength of the ultraviolet lamp (12) is 250-260nm, and the illumination time is greater than or equal to 10s; Step 2: the exhaust air after UV disinfection enters the spray chamber (2), and animal hair and dust in the exhaust air are removed by spraying, and ammonia in the exhaust air is dissolved in water to form ammonia water by spraying; Step 3: the exhaust air after spraying enters the first reaction chamber (3), wherein pure oxygen is injected into the first reaction chamber (3), and hydrogen sulfide in the exhaust air and the pure oxygen are burned in the first reaction chamber (3) to generate sulfur dioxide; Step 4: introducing the outlet air containing sulfur dioxide from the first reaction chamber (3) into the liquid in the second reaction chamber (4), the liquid being derived from the outlet water of the spray chamber (2) and containing ammonia water; the sulfur dioxide reacts with the ammonia water in the liquid through aeration to generate ammonium sulfite; Step 5: The aerated gas leaves the liquid in the second reaction chamber (4) and is discharged through the exhaust port (43).

9. The method for exhaust treatment of an experimental animal room according to claim 8, characterized in that: In step five, the gas exhausted from the second reaction chamber (4) is reintroduced into the experimental animal room via a pipeline, thereby achieving air recycling.

10. The method for exhaust treatment of an experimental animal room according to claim 8, characterized in that: After step 5, the liquid in the second reaction chamber (4) is discharged regularly to remove the animal hair accumulated at the bottom of the second reaction chamber (4) and to recover the ammonium sulfite solution.

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