Photocatalytic inactivation biological aerosol device

Abstract

The invention discloses a photocatalytic inactivation biological aerosol device which comprises a closed reaction cylinder, a temperature adjusting device, a biological aerosol generating device, a biological aerosol collecting device, a gas circulating device and a xenon lamp, and the closed reaction cylinder is provided with an aerosol reaction cabin and a constant-temperature water bath cabin which are distributed inside and outside; the temperature adjusting device is communicated with the constant-temperature water bath cabin through a water conveying pipe; the biological aerosol generating device and the biological aerosol collecting device are respectively connected and communicated with the aerosol reaction cabin through gas conveying pipes; the gas circulating device is connected and communicated with the aerosol reaction cabin through a gas conveying pipe; and the xenon lamp is positioned above the closed reaction cylinder. According to the invention, the conditions of indoor natural light irradiation, basically constant temperature and continuous flow of gas can be simulated, so that the real environment in which aerosol exists indoors can be simulated, and data support is provided for the practical application of the photocatalysis technology in solving the problem of indoor aerosol.

Description

Technical Field

[0001] The invention relates to the technical field of photocatalytic simulation devices, and more particularly to a photocatalytic bioaerosol inactivation device. Background Art

[0002] Air pollution is a global issue concerning human health, and bioaerosols are one of the main pollutants causing air pollution. Many infectious diseases are transmitted between people through bioaerosols, which makes it important to study and develop disinfection and prevention measures for bioaerosols. At present, people spend more and more time indoors, such as in homes, schools, studios, public places, etc. The health risks brought by pathogenic microorganisms in indoor places are increasing, which has a significant impact on people's lives. The level of indoor air quality directly affects people's daily work and life, and also increases people's risk of respiratory diseases. Therefore, the bioaerosol inactivation mechanism for closed environments has attracted widespread attention.

[0003] Photocatalytic technology has the advantages of low energy consumption, simple reaction conditions, and easy operation. It has become one of the important technologies for killing bioaerosols and has been widely used in recent years to improve indoor air quality. However, it is currently impossible to simulate the aerosols in the daily indoor environment, especially the indoor air flow, the basically constant indoor temperature, the indoor visible light irradiation, and the use of simple methods to carry photocatalysts, so it is impossible to conduct research on the related fields of bioaerosol inactivation.

[0004] Therefore, providing a photocatalytic inactivation bioaerosol device that truly simulates an indoor enclosed space is an issue that needs to be urgently addressed by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a photocatalytic inactivation of biological aerosols device, which can effectively simulate the aerosol conditions in a confined indoor space and provide data support for the practical application of photocatalytic technology in solving indoor aerosol problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A photocatalytic bioaerosol inactivation device, comprising:

[0008] A closed reaction cylinder, wherein the closed reaction cylinder has an aerosol reaction chamber and a constant temperature water bath chamber distributed inside and outside;

[0009] A temperature regulating device, the temperature regulating device is connected to the constant temperature water bath cabin through a water pipe;

[0010] A bioaerosol generating device and a bioaerosol collecting device, wherein the bioaerosol generating device and the bioaerosol collecting device are respectively connected to the aerosol reaction cabin through air pipes;

[0011] A gas circulation device, the gas circulation device is connected to the aerosol reaction chamber through a gas pipe;

[0012] A xenon lamp is located above the sealed reaction cylinder.

[0013] By adopting the above scheme, the beneficial effects of the present invention are:

[0014] The present invention can simulate the conditions of indoor natural light irradiation, basically constant temperature and continuous gas flow, so as to simulate the real environment of indoor aerosols, and provide data support for the practical application of photocatalytic technology in solving indoor aerosol problems.

[0015] Furthermore, the closed reaction cylinder includes an outer shell, an inner shell, a sealing gasket and a cover body, the inner shell is embedded and installed inside the outer shell to form the constant temperature water bath chamber between the outer shell and the inner shell, and the aerosol reaction chamber is formed inside the inner shell; the flange side of the outer shell and the inner shell that fit together or the flange side of the inner shell and the outer shell that fit together have an annular groove; the sealing gasket is installed in the annular groove; the cover body is pressed against the top of the inner shell and is clamped and fixed to the outer shell by a plurality of sealing clips.

[0016] Furthermore, an annular step for placing the catalyst carrier is provided in the middle of the inner wall of the inner shell.

[0017] Furthermore, the outer shell has a water outlet and a water inlet distributed on the upper and lower sides of the annular step, and the temperature regulating device is connected to the water inlet and the water outlet through a water pipe respectively; the inner shell has a sample inlet and a sample outlet distributed on the upper and lower sides of the annular step; the bioaerosol generating device is connected to the sample inlet through an air pipe, and the bioaerosol collecting device is connected to the sample outlet through an air pipe; the inner shell has an air outlet and an air inlet distributed on the upper and lower sides of the annular step; the gas circulation device is connected to the air outlet and the air inlet through an air pipe respectively.

[0018] Furthermore, the water outlet, the water inlet, the sample inlet, the sample outlet, the air outlet and the air inlet are staggered in distribution.

[0019] Furthermore, the air pipe and the water pipe are both sterile silicone hoses.

[0020] It can be seen that the present invention provides a device for photocatalytically inactivating bioaerosols. Compared with the prior art, the present invention:

[0021] 1) An annular step is provided in the middle of the inner wall of the inner shell, on which the catalyst carrier is placed, thereby dividing the aerosol reaction chamber into two upper and lower spaces, which can limit the position of the catalyst carrier and facilitate loading without affecting the reaction.

[0022] 2) The inner shell and the outer shell are distributed inside and outside to separate the constant temperature water bath chamber and the aerosol reaction chamber, which not only ensures that the internal photocatalytic reaction is not affected, but also allows flowing water to be introduced into the constant temperature water bath chamber to ensure constant temperature, simulating the situation where the indoor temperature is basically constant.

[0023] 3) Through the gas circulation device, it is ensured that even if the aerosol reaction chamber is divided into two spaces, the aerosol concentration in the upper and lower spaces can be kept the same, thereby improving the inactivation efficiency and simulating the indoor air flow.

[0024] 4) Use a xenon lamp to simulate indoor visible light exposure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention 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 embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 The accompanying drawing is a schematic structural diagram of a photocatalytic bioaerosol inactivation device provided by the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1As shown, the embodiment of the present invention discloses a photocatalytic bioaerosol inactivation device, comprising a closed reaction tube 1, a temperature regulating device 2, a bioaerosol generating device 3, a bioaerosol collecting device 4, a gas circulation device 5 and a xenon lamp 6. The closed reaction tube 1 has an aerosol reaction chamber and a constant temperature water bath chamber distributed inside and outside; the temperature regulating device 2 is connected to the constant temperature water bath chamber through a water pipe to keep the internal temperature of the aerosol reaction chamber constant. In this embodiment, the temperature regulating device 2 adopts a constant temperature water bath pot; the bioaerosol generating device 3 is provided with a temperature regulating device 2, a bioaerosol collecting device 4, a gas circulation device 5 and a xenon lamp 6. The device 3 and the bioaerosol collection device 4 are connected to the aerosol reaction chamber through gas pipes, respectively, wherein the bioaerosol generating device 3 is used to input bioaerosol into the aerosol reaction chamber at a constant flow rate, and the bioaerosol collection device 4 is used to collect bioaerosol inside the aerosol reaction chamber at a constant flow rate; the gas circulation device 5 is connected to the aerosol reaction chamber through a gas pipe, and in this embodiment, the gas circulation device 5 adopts a gas circulation pump; the xenon lamp 6 is located above the closed reaction cylinder 1, and is used to simulate the irradiation of natural light. The present invention can simulate the situation of indoor natural light irradiation, basically constant temperature and continuous flow of gas, so as to simulate the real environment of indoor aerosol, and provide data support for the practical application of photocatalytic technology in solving indoor aerosol problems.

[0029] Specifically, the closed reaction cylinder 1 includes an outer shell 11, an inner shell 12, a sealing gasket and a cover 13. The inner shell 12 is embedded and installed inside the outer shell 11 to form a constant temperature water bath cabin between the outer shell 11 and the inner shell 12, and an aerosol reaction cabin is formed inside the inner shell 12. The distance between the inner wall of the outer shell 11 and the outer wall of the inner shell 12 is 10-15mm; the flange side of the outer shell 11 and the inner shell 12 or the flange side of the inner shell 12 and the outer shell 11 has an annular groove; the sealing gasket is installed in the annular groove; the cover 13 covers and presses against the top of the inner shell 12 and is clamped and fixed to the outer shell 11 by multiple sealing clips. In this embodiment, the shell 11 and the inner shell 12 are both cylindrical; the outer shell 11, the inner shell 12 and the cover 13 are all made of quartz glass, and the volume of the aerosol reaction cabin is 0.8-1L, preferably 1L; the number of sealing clips is 4.

[0030] In order to further optimize the technical solution of the present invention, an annular step 14 for placing the catalyst carrier is provided in the middle of the inner wall of the inner shell 12. In this embodiment, the width of the step 14 is 20 mm.

[0031] Specifically, the outer shell 11 has a water outlet 111 and a water inlet 112 distributed on the upper and lower sides of the annular step 14, and the temperature regulating device 2 is connected to the water inlet 112 and the water outlet 111 through a water pipe respectively; the inner shell 12 has a sample inlet 121 and a sample outlet 122 distributed on the upper and lower sides of the annular step 14; the bioaerosol generating device 3 is connected to the sample inlet 121 through an air pipe, and the bioaerosol collecting device 4 is connected to the sample outlet 122 through an air pipe; the inner shell 12 has an air outlet and an air inlet 123 distributed on the upper and lower sides of the annular step 14; the gas circulation device 5 is connected to the air outlet and the air inlet 123 through an air pipe respectively, to ensure that the bioaerosol concentrations in the upper and lower spaces of the aerosol reaction chamber are the same.

[0032] In order to further optimize the technical solution of the present invention, the water outlet 111 , the water inlet 112 , the sample inlet 121 , the sample outlet 123 , the air outlet and the air inlet 123 are staggered in distribution.

[0033] Specifically, the air pipe and the water pipe are both sterile silicone hoses with an inner diameter of 6-8 mm.

[0034] Working process of the present invention:

[0035] First, assemble the inner shell 12 and the outer shell 11 and place them directly under the xenon lamp 6, which simulates a natural light source; then, place the catalyst carrier loaded with the photocatalyst on the annular step 14 and clamp it; then, connect the water inlet 112 and the water outlet 111 to the constant temperature water bath through water pipes to ensure that the temperature in the cabin is constant during the photocatalytic reaction; then connect the air inlet 123 and the air outlet to the gas circulation pump through air pipes to ensure that the reaction is fully carried out; then connect the sampling port 121 to the bioaerosol generating device 3 through the air pipe, and connect the sampling port 122 to the bioaerosol collecting device 4 through the air pipe; then place a sealing gasket in the annular groove, cover the cover 13, and clamp the cover 13 and the outer shell 11 with a sealing clamp; finally, turn on the xenon lamp 6, turn on the gas circulation pump and the bioaerosol generating device 3, and start the reaction.

[0036] In this embodiment, the bioaerosol generating device 3 uses an ATM-226 aerosol generator, and the bioaerosol is introduced into the aerosol reaction chamber at a stable flow rate of 4L / min. The working time of the aerosol generator is 5min. The bioaerosol freely diffuses in the aerosol reaction chamber for 0 / 2 / 5 / 10 / 18 / 30 / 45 / 60 / 90 / 120 / 150 / 180min and is then completely extracted by the bioaerosol collecting device 4. The working efficiency of the bioaerosol collecting device 4 is 28L / min, and all the biological particles in the aerosol reaction chamber can be removed. During the air extraction process, the biological particles are trapped on the sampling plate of the bioaerosol collecting device 4. In this embodiment, an Anderson six-stage sampler is used, and the sampling plate is a sterile solid culture medium prepared in advance. After the air extraction is completed, the aerosol reaction chamber is cleaned and the bioaerosol reaction is carried out again.

[0037] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0038] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A photocatalytic bioaerosol inactivation device, characterized in that: include: A closed reaction cylinder, wherein the closed reaction cylinder has an aerosol reaction chamber and a constant temperature water bath chamber distributed inside and outside; A temperature regulating device, the temperature regulating device is connected to the constant temperature water bath cabin through a water pipe; A bioaerosol generating device and a bioaerosol collecting device, wherein the bioaerosol generating device and the bioaerosol collecting device are respectively connected to the aerosol reaction cabin through air pipes; A gas circulation device, the gas circulation device is connected to the aerosol reaction chamber through a gas pipe; A xenon lamp is located above the sealed reaction cylinder.

2. A photocatalytic bioaerosol inactivation device according to claim 1, characterized in that: The closed reaction cylinder includes an outer shell, an inner shell, a sealing gasket and a cover body. The inner shell is embedded and installed inside the outer shell to form the constant temperature water bath chamber between the outer shell and the inner shell, and the aerosol reaction chamber is formed inside the inner shell. The flange side of the outer shell and the inner shell that fit together or the flange side of the inner shell and the outer shell that fit together have an annular groove; the sealing gasket is installed in the annular groove; the cover body is pressed against the top of the inner shell and is clamped and fixed to the outer shell by a plurality of sealing clips.

3. A photocatalytic bioaerosol inactivation device according to claim 2, characterized in that: An annular step for placing a catalyst carrier is provided in the middle of the inner wall of the inner shell.

4. The device for photocatalytically inactivating bioaerosol according to claim 3, characterized in that: The outer shell has a water outlet and a water inlet distributed on the upper and lower sides of the annular step, and the temperature regulating device is connected to the water inlet and the water outlet through a water pipe respectively; the inner shell has a sample inlet and a sample outlet distributed on the upper and lower sides of the annular step; the bioaerosol generating device is connected to the sample inlet through an air pipe, and the bioaerosol collecting device is connected to the sample outlet through an air pipe; the inner shell has an air outlet and an air inlet distributed on the upper and lower sides of the annular step; the gas circulation device is connected to the air outlet and the air inlet through an air pipe respectively.

5. The device for photocatalytically inactivating bioaerosol according to claim 4, characterized in that: The water outlet, the water inlet, the sample inlet, the sample outlet, the air outlet and the air inlet are staggered and distributed.

6. The device for photocatalytically inactivating bioaerosol according to claim 4, characterized in that: Both the air and water pipes are sterile silicone hoses.

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