Purification process and purification device for reducing TOC in ammonia

Abstract

The present application relates to the field of ammonia purification process, and specifically discloses a purification process and a purification device for reducing TOC in ammonia. The purification process for reducing TOC in ammonia includes the following steps: purifying ammonia by adsorption microspheres to obtain pre-purified ammonia; decomposing and purifying the pre-purified ammonia by ultraviolet light to obtain high-purity ammonia; the adsorption microspheres are selected from one or a combination of graphitized activated carbon and acid-base modified activated carbon. The purification device of the present application can be used for the purification process of reducing TOC in ammonia. The purification process of the present application has the advantages of efficiently and effectively reducing TOC in ammonia and improving the quality effect of ammonia.

Description

Technical Field

[0001] The present application relates to the field of ammonia purification technology, and more specifically, it relates to a purification technology and a purification device for reducing TOC in ammonia. Background Art

[0002] Total organic carbon (TOC) refers to the total amount of carbon contained in organic matter. It is a comprehensive indicator that characterizes the total amount of organic matter in liquid / gas, and represents the sum of organic matter contained in the liquid. In the production and preparation of high-purity ammonia, TOC content is increasingly valued as an important indicator, which is crucial to the stability and reliability of high-purity ammonia.

[0003] At present, in the purification process of ammonia, activated carbon adsorption is widely used due to its low raw material cost and high TOC adsorption efficiency. However, the adsorption rate of conventional activated carbon materials is limited. It is difficult to meet the quality requirements of high-purity ammonia (TOC less than 1ppb) by using only conventional activated carbon to purify ammonia, so it needs to be improved. Summary of the invention

[0004] In order to reduce the TOC in ammonia, the present application provides a purification process and a purification device for reducing the TOC in ammonia.

[0005] In a first aspect, the present application provides a purification process for reducing TOC in ammonia gas, using the following technical solution: A purification process for reducing TOC in ammonia gas, comprising the following steps:

[0006] Purifying ammonia by adsorption through adsorption microspheres to obtain pre-purified ammonia;

[0007] The pre-purified ammonia is decomposed and purified by ultraviolet light to obtain high-purity ammonia;

[0008] The adsorption microspheres are selected from one or a combination of graphitized activated carbon and acid-base modified activated carbon.

[0009] By adopting the above technical scheme, graphitized activated carbon and / or acid-base modified activated carbon have better adsorption efficiency and effect, and can efficiently and effectively reduce TOC in ammonia; and then catalyze the oxidation and decomposition of residual TOC in ammonia by ultraviolet light, thereby further reducing the TOC content in ammonia, and obtaining high-alcohol ammonia with excellent purity.

[0010] Preferably, the particle size of the adsorption microspheres is 20-80 meshes.

[0011] Preferably, the graphitized activated carbon is nanoporous graphitized hard spherical activated carbon microbeads Linglong; specifically, LINGLONG-GCB1300 or LINGLONG-GCB9807 purchased from Senhua Company.

[0012] By adopting the above technical solution, the nanoporous graphitized hard spherical activated carbon microbeads Linglong have a hexagonal structure on the surface of graphitized carbon black, and have a strong specific selective adsorption function for planar molecules, molecules containing planar aromatic rings, small molecules with low boiling point organic carbon, etc., and it has a layered microporous structure, presents a single molecule gradient adsorption mode, has rich active adsorption sites and a large specific surface area, and can efficiently and effectively reduce TOC in ammonia.

[0013] Preferably, the acid-base modified activated carbon is obtained by sequentially modifying coconut shell activated carbon with an oxygen-containing acid solution and an organic base solution.

[0014] By adopting the above technical scheme, the activated carbon is preliminarily treated with oxygen-containing acid to remove impurities in the activated carbon, which greatly increases the specific surface area of ​​the activated carbon and improves the adsorption performance of the activated carbon. The activated carbon is then surface treated with an organic base to make the surface of the activated carbon alkaline, which is beneficial to promote the adsorption of small molecular organic carbon by the activated carbon, and is beneficial to promote the adsorption of carbon dioxide by the activated carbon, thereby further purifying ammonia.

[0015] Preferably, the oxygen-containing acid is selected from one or a combination of boric acid, acetic acid, hypochlorous acid, peracetic acid, phosphoric acid, monochloroacetic acid, glycolic acid, and propanoic acid; and the mass fraction of the oxygen-containing acid solution is 4-8%.

[0016] Preferably, the organic base is selected from one or a combination of urea, diphenylamine, pyridinediamine, triethylamine, N,N-diisopropylethylamine, triethylenediamine; and the mass fraction of the organic base solution is 5-10%.

[0017] Preferably, the modification method of the acid-base modified activated carbon specifically comprises the following steps:

[0018] The coconut shell activated carbon is washed with acetone and pure water respectively, and dried at 80-100° C. to obtain pretreated activated carbon;

[0019] Soak the cleaned coconut shell activated carbon in an oxygen-containing acid solution, immerse at a constant temperature of 50-70°C for 1-2 hours, and then wash with pure water until neutral;

[0020] The acidified coconut shell activated carbon is immersed in an organic alkali solution, and is immersed at a constant temperature of 60-80° C. for 5-10 hours, and then washed with pure water until neutral, and dried at 80-100° C. to obtain acid-base modified activated carbon.

[0021] Preferably, the wavelength of the ultraviolet light is 180-300 nm.

[0022] By adopting the above technical solution, the ultraviolet light of the above wavelength can effectively decompose the organic matter in the ammonia and play an effective sterilization role.

[0023] In a second aspect, the present application provides a purification device, which adopts the following technical solution:

[0024] A purification device, applied to the above-mentioned purification process for reducing TOC in ammonia;

[0025] The purification device comprises an adsorption mechanism and a decomposition mechanism, wherein the input end of the adsorption mechanism is used to input ammonia to be purified, the output end of the adsorption mechanism is connected to the input end of the decomposition mechanism, and the output end of the decomposition mechanism is used to output purified ammonia; adsorption microspheres are arranged in the adsorption mechanism, and an ultraviolet lamp is arranged in the decomposition mechanism.

[0026] By adopting the above technical scheme, the ammonia to be purified is input into the adsorption mechanism, the adsorption microspheres adsorb and purify the ammonia, the adsorption mechanism inputs the pre-purified ammonia into the decomposition mechanism, the ultraviolet light emitted by the ultraviolet lamp decomposes and purifies the pre-purified ammonia, and the obtained high-purity ammonia is output by the decomposition mechanism.

[0027] Preferably, the adsorption mechanism includes a mounting part and an adsorption part, the mounting part includes an adsorption tank, and a first input pipe and a first output pipe respectively connected to the adsorption tank, the adsorption part is arranged in the side wall of the adsorption tank and located between the first input pipe and the first output pipe, and the adsorption microspheres are arranged in the adsorption part.

[0028] Preferably, the adsorption element includes two filter plates, the outer peripheral wall of each filter plate is connected to the inner wall of the adsorption tank, and an adsorption cavity for accommodating the adsorption microspheres is formed between the two filter plates; a microsphere inlet pipe and a microsphere outlet pipe are connected on the outer wall of the adsorption tank, the microsphere inlet pipe and the microsphere outlet pipe are both connected to the adsorption cavity, and a sealing cover is provided on the end of the microsphere inlet pipe and the microsphere outlet pipe away from the outer wall of the adsorption tank.

[0029] By adopting the above technical scheme, the ammonia to be purified is input into the adsorption tank through the first input pipe, enters the adsorption chamber through the filter partition, and the adsorption microspheres adsorb and purify the ammonia to be purified. Most of the TOC in the ammonia to be purified is adsorbed by the adsorption microspheres to obtain pre-purified ammonia. After the adsorption tank has been working for a long time, the staff can open the sealing cover and replace and update the adsorption microspheres to ensure the purification effect and efficiency of the adsorption microspheres.

[0030] Preferably, the decomposition mechanism includes a decomposition tank, a second input pipe connected to the decomposition tank, a second output pipe connected to the decomposition tank, and a separation sleeve installed in the inner cavity of the decomposition tank; a mounting flange is installed at one end of the decomposition tank, a connecting plug is inserted into the inner thread of the side wall of the mounting flange, one end of the separation sleeve is connected to the connecting plug, and the other end is passed through the inner cavity of the decomposition tank; the separation sleeve is a transparent sleeve; one end of the ultraviolet lamp is installed on the connecting plug, and the other end is passed through the inner cavity of the separation sleeve.

[0031] By adopting the above technical solution, the pre-purified ammonia output by the adsorption mechanism enters the decomposition tank through the second input pipe. Under the action of the ultraviolet light emitted by the ultraviolet lamp, the residual TOC in the pre-purified ammonia is fully oxidized and decomposed to obtain high-purity ammonia. The high-purity ammonia is output from the second output pipe and collected by the staff.

[0032] In summary, this application has the following beneficial effects:

[0033] 1. The graphitized activated carbon and / or acid-base modified activated carbon used in this application has better adsorption efficiency and effect, and can efficiently and effectively reduce the TOC in ammonia; and then catalyze the oxidation and decomposition of residual TOC in ammonia by ultraviolet light, thereby further reducing the TOC content in ammonia, and obtaining high-alcohol ammonia with excellent purity;

[0034] 2. In this application, nanoporous graphitized hard spherical activated carbon microbeads are preferably used as adsorption microspheres. They have a hexagonal structure on the surface of graphitized carbon black, and have a strong specific selective adsorption function for planar molecules, molecules containing planar aromatic rings, small molecules with low boiling point organic carbon, etc., and they have a layered microporous structure, presenting a single molecule gradient adsorption mode, rich active adsorption sites, and large specific surface area, which can efficiently and effectively reduce TOC in ammonia. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of a purification device in Example 9 of the present application;

[0036] Figure 2 is a schematic cross-sectional view in the vertical direction of the adsorption mechanism in Example 9 of the present application;

[0037] Figure 3 It is a schematic cross-sectional view in the vertical direction of the decomposition mechanism in Example 9 of the present application.

[0038] Description of reference numerals:

[0039] 1. Adsorption mechanism; 11. Mounting piece; 111. Adsorption tank; 112. First input pipe; 113. First output pipe; 114. Microsphere inlet pipe; 115. Microsphere outlet pipe; 116. Sealing cover; 12. Adsorption piece; 121. Filter baffle; 122. Adsorption chamber; 2. Decomposition mechanism; 21. Decomposition tank; 211. Mounting flange; 212. Connecting plug; 22. Second input pipe; 23. Second output pipe; 24. Separation sleeve; 27. Ultraviolet lamp. DETAILED DESCRIPTION

[0040] The present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0041] Preparation Example

[0042] Preparation Example 1

[0043] This preparation example provides an acid-base modified activated carbon, and the preparation method is as follows:

[0044] The coconut shell activated carbon was washed three times with acetone, then washed three times with pure water, and dried in an oven at 80°C;

[0045] The washed coconut shell activated carbon was immersed in 8% acetic acid solution at a solid-liquid ratio of 1:8, and was kept in constant temperature and shaken at 65°C for 1 hour. After filtering, it was washed with pure water until the washing liquid was neutral, and dried in an oven at 85°C.

[0046] The acidified coconut shell activated carbon was then immersed in a triethylamine solution with a mass fraction of 8% at a solid-liquid ratio of 1:10, and immersed in a constant temperature shaking solution at 70°C for 8 hours. After filtering, it was washed with pure water until the washing liquid was neutral, and then dried in an oven at 85°C to obtain acid-base modified activated carbon.

[0047] In this preparation example, the coconut shell activated carbon is commercially available 20-40 mesh coconut shell activated carbon.

[0048] Preparation Example 2

[0049] This preparation example provides an acid-base modified activated carbon, and the preparation method is as follows:

[0050] The coconut shell activated carbon was washed three times with acetone, then washed three times with pure water, and dried in an oven at 80°C;

[0051] The washed coconut shell activated carbon was immersed in a 6% phosphoric acid solution at a solid-liquid ratio of 1:8, and was kept at 55°C for 2 hours under constant temperature and shaking. After filtering, it was washed with pure water until the washing liquid was neutral, and then dried in an oven at 85°C.

[0052] The acidified coconut shell activated carbon was then immersed in an 8% urea solution at a solid-liquid ratio of 1:10, and immersed in a constant temperature shaking immersion at 70°C for 8 hours. After filtering, it was washed with pure water until the washing liquid was neutral, and then dried in an oven at 85°C to obtain acid-base modified activated carbon.

[0053] In this preparation example, the coconut shell activated carbon is commercially available 20-40 mesh coconut shell activated carbon.

[0054] Example

[0055] Example 1

[0056] This embodiment provides a purification process for reducing TOC in ammonia, comprising the following steps:

[0057] The liquid ammonia is injected into the liquid ammonia evaporator for evaporation, and then the gas-liquid separation is performed through the separator to obtain the ammonia gas to be purified;

[0058] The ammonia gas to be purified is injected into an adsorption tower with built-in adsorption microspheres for adsorption purification to obtain pre-purified ammonia gas;

[0059] The pre-purified ammonia gas is injected into a decomposition tower with a built-in ultraviolet lamp for decomposition and purification, and the purified product is collected to obtain high-purity ammonia gas.

[0060] In this embodiment, the adsorption microspheres are graphitized activated carbon, specifically 20-40 mesh LINGLONG-GCB9807 nanoporous graphitized hard spherical activated carbon microspheres purchased from Senhua Company; the ultraviolet light wavelength of the ultraviolet lamp is 185nm.

[0061] Example 2

[0062] The only difference between this embodiment and embodiment 1 is that the graphitized activated carbon is specifically 20-40 mesh LINGLONG-GCB1300 nanoporous graphitized hard spherical activated carbon microbeads purchased from Senhua Company; and the ultraviolet light wavelength of the ultraviolet lamp is 185nm.

[0063] Example 3

[0064] The only difference between this embodiment and embodiment 1 is that the graphitized activated carbon is specifically a 20-40 mesh Carbogrid B graphitized carbon black activated carbon adsorbent purchased from Chaum Analytical Technology Co., Ltd.

[0065] Example 4

[0066] The only difference between this embodiment and embodiment 1 is that the graphitized activated carbon is specifically a 20-40 mesh Carbogrid X graphitized carbon black activated carbon adsorbent purchased from Chaum Analytical Technology Co., Ltd.

[0067] Example 5

[0068] The only difference between this embodiment and embodiment 1 is that the graphitized activated carbon is prepared by the following method:

[0069] Take commercially available coconut shell activated carbon, wash it three times with acetone, then wash it three times with pure water, and dry it in an oven at 80°C;

[0070] The washed coconut shell activated carbon was placed in a high-temperature tube furnace, heated to 900°C in an inert argon atmosphere, kept warm for 1 hour, then cooled to room temperature, and then ground to 20-40 mesh to obtain graphitized activated carbon.

[0071] Example 6

[0072] The only difference between this embodiment and embodiment 1 is that the adsorption microspheres are acid-base modified activated carbon prepared in preparation example 1.

[0073] Example 7

[0074] The only difference between this embodiment and embodiment 1 is that the adsorption microspheres are acid-base modified activated carbon prepared in preparation example 2.

[0075] Example 8

[0076] The only difference between this embodiment and Embodiment 1 is that the wavelength of the ultraviolet light is 254 nm.

[0077] Example 9

[0078] This embodiment discloses a purification device, which can be applied to a purification process for reducing TOC in ammonia.

[0079] The following is combined with Figure 1-3 This application is described in further detail.

[0080] Reference Figure 1 The purification device includes an adsorption mechanism 1 and a decomposition mechanism 2 connected to the adsorption mechanism 1. The adsorption mechanism 1 is provided with adsorption microspheres, and the decomposition mechanism 2 is provided with an ultraviolet lamp. The ammonia to be purified is input from the input end of the adsorption mechanism 1, and is transmitted to the decomposition mechanism 2 after being adsorbed and purified by the adsorption microspheres. After being decomposed and purified by ultraviolet light, the decomposition mechanism 2 outputs high-purity ammonia.

[0081] Reference Figure 2 The adsorption mechanism 1 includes a mounting member 11 and two groups of adsorption members 12 disposed in the mounting member 11. The mounting member 11 includes an adsorption tank 111, a first input pipe 112 and a first output pipe 113. The first input pipe 112 is connected to one end of the adsorption tank 111 in the axial direction, and the first output pipe 113 is connected to the other end of the adsorption tank 111. The two groups of adsorption members 12 are disposed in the side wall of the adsorption tank 111 and are located between the first input pipe 112 and the first output pipe 113.

[0082] Reference Figure 2 Each group of adsorbents 12 includes two filter partitions 121, which are arranged in parallel inside the side wall of the adsorption tank 111. The outer peripheral wall of each filter partition 121 is connected to the inner side wall of the adsorption tank 111, and an adsorption cavity 122 for accommodating adsorption microspheres is formed between the two filter partitions 121. A plurality of filter holes for ammonia gas to pass through are evenly distributed on each filter partition 121, and the inner diameter of the filter hole is smaller than the outer diameter of the adsorption microsphere.

[0083] Reference Figure 2 Two microsphere inlet tubes 114 and two microsphere outlet tubes 115 are provided through the side wall of the adsorption tank 111. Each microsphere inlet tube 114 is provided corresponding to one of the microsphere outlet tubes 115, and is respectively located at the radial ends of the adsorption tank 111 and communicates with one of the adsorption chambers 122. Each microsphere inlet tube 114 and each microsphere outlet tube 115 are provided with a sealing cover 116 at one end away from the adsorption tank 111.

[0084] Reference Figure 3 The decomposition mechanism 2 includes a decomposition tank 21, a second input pipe 22, a second output pipe 23, a separation sleeve 24, a mounting flange 211, a connection plug 212 and an ultraviolet lamp 27. One end of the second output pipe 23 is connected to the first output pipe 113, and the other end is connected to the decomposition tank 21. The second output pipe 23 is connected to the decomposition tank 21, and the second output pipe 23 is located at an end of the decomposition tank 21 away from the second input pipe 22 in the length direction. One end of the decomposition tank 21 in the length direction is installed with a mounting flange 211, and the connection plug 212 is threadedly inserted into the side wall of the mounting flange 211. The separation sleeve 24 is arranged in the inner cavity of the decomposition tank 21, and one end of the separation sleeve 24 in the length direction is connected to the connection plug 212, and the other end is sealed and extends along the length direction of the decomposition tank 21. A decomposition chamber for accommodating ammonia is formed between the outer wall of the separation sleeve 24, the side wall of the connection plug 212 close to the separation sleeve 24, and the inner wall of the decomposition tank 21. One end of the ultraviolet lamp tube 27 is mounted on the connecting plug 212, and the other end is inserted into the inner cavity of the separation sleeve 24 and extends along the length direction of the separation sleeve 24. The separation sleeve 24 is a transparent sleeve.

[0085] The implementation principle of a purification device in an embodiment of the present application is as follows: the ammonia to be purified is input into the adsorption tank 111 through the first input pipe 112, enters the adsorption chamber 122 through the filter partition 121, and the adsorption microspheres adsorb and purify the ammonia to be purified; through the joint action of the two groups of adsorbents 12, most of the TOC in the ammonia to be purified is adsorbed by the adsorption microspheres to obtain pre-purified ammonia; the pre-purified ammonia enters the decomposition chamber of the decomposition tank 21 through the first output pipe 113 and the second input pipe 22, and under the action of the ultraviolet light emitted by the ultraviolet lamp 27, the residual TOC in the pre-purified ammonia is fully oxidized and decomposed to obtain high-purity ammonia, which is output from the second output pipe 23 and collected by the staff; when the adsorption tank 111 has been working for a long time, the staff can open the sealing cover 116 to replace and update the adsorption microspheres.

[0086] Comparative Example

[0087] Comparative Example 1

[0088] The only difference between this comparative example and Example 1 is that the adsorption microspheres are commercially available 20-40 mesh coconut shell activated carbon.

[0089] Comparative Example 2

[0090] The difference between this comparative example and Example 1 is that the purification process for reducing TOC in ammonia includes the following steps:

[0091] The liquid ammonia is injected into the liquid ammonia evaporator for evaporation, and then the gas-liquid separation is performed through the separator to obtain the ammonia gas to be purified;

[0092] The ammonia to be purified is injected into an adsorption tower with built-in graphitized activated carbon for adsorption purification, and the purified product is collected to obtain high-purity ammonia.

[0093] The graphitized activated carbon in this comparative example is 20-40 mesh LINGLONG-GCB9807 nanoporous graphitized hard spherical activated carbon microbeads Linglong purchased from Senhua Company.

[0094] Comparative Example 3

[0095] The difference between this comparative example and Example 1 is that the purification process for reducing TOC in ammonia gas includes the following steps: injecting liquid ammonia into a liquid ammonia evaporator for evaporation treatment, and then performing gas-liquid separation through a separator to obtain ammonia gas to be purified;

[0096] The ammonia to be purified is injected into a decomposition tower with a built-in ultraviolet lamp for decomposition and purification, and the purified product is collected to obtain high-purity ammonia.

[0097] The performance test used a Kurek gas TOC analyzer to detect the TOC content in the high alcohol ammonia gas obtained in Examples 1-8 and Comparative Example 1. The results are summarized in Table 1.

[0098] Table 1

[0099] TOC content / ppb Example 1 0.1 Example 2 0.1 Example 3 0.9 Example 4 0.7 Example 5 1.0 Example 6 0.8 Example 7 0.6 Example 8 0.1 Comparative Example 1 2.2 Comparative Example 2 4.6 Comparative Example 3 ≥5.0

[0100] It can be seen from Examples 1-8 and Comparative Examples 1-3 and Table 1 that the use of graphitized activated carbon or acid-base modified activated carbon as adsorption particles in combination with ultraviolet light treatment can significantly reduce the TOC content in ammonia and effectively purify ammonia.

[0101] It can be seen from Examples 1-7 and Table 1 that the use of nanoporous graphitized hard spherical activated carbon microbeads as graphitized activated carbon can achieve a more excellent purification effect and significantly reduce the TOC content in ammonia.

[0102] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A purification process for reducing TOC in ammonia, characterized in that: The following steps are involved: Purifying ammonia by adsorption through adsorption microspheres to obtain pre-purified ammonia; The pre-purified ammonia is decomposed and purified by ultraviolet light to obtain high-purity ammonia; the adsorption microspheres are selected from graphitized activated carbon; The graphitized activated carbon is nanoporous graphitized hard spherical activated carbon microbeads Linglong; LINGLONG-GCB1300 or LINGLONG-GCB9807 purchased from Senhua Company; The purification device used in the purification process comprises an adsorption mechanism (1) and a decomposition mechanism (2), wherein the input end of the adsorption mechanism (1) is used to input ammonia to be purified, the output end of the adsorption mechanism (1) is connected to the input end of the decomposition mechanism (2), and the output end of the decomposition mechanism (2) is used to output purified ammonia; the adsorption mechanism (1) is provided with adsorption microspheres, and the decomposition mechanism (2) is provided with an ultraviolet lamp (27).

2. The purification process for reducing TOC in ammonia according to claim 1, characterized in that: The wavelength of the ultraviolet light is 180-300nm.

3. The purification process for reducing TOC in ammonia according to claim 1, characterized in that: The adsorption mechanism (1) comprises a mounting member (11) and an adsorption member (12); the mounting member (11) comprises an adsorption tank (111), and a first input pipe (112) and a first output pipe (113) respectively connected to the adsorption tank (111); the adsorption member (12) is arranged in a side wall of the adsorption tank (111) and is located between the first input pipe (112) and the first output pipe (113); and the adsorption microspheres are arranged in the adsorption member (12).

4. The purification process for reducing TOC in ammonia according to claim 3, characterized in that: The adsorption element (12) comprises two filter baffles (121), the outer peripheral wall of each filter baffle (121) is connected to the inner wall of the adsorption tank (111), and an adsorption chamber (122) for accommodating the adsorption microspheres is formed between the two filter baffles (121); a microsphere inlet pipe (114) and a microsphere outlet pipe (115) are arranged on the outer side wall of the adsorption tank (111), the microsphere inlet pipe (114) and the microsphere outlet pipe (115) are both in communication with the adsorption chamber (122), and a sealing cover (116) is arranged at one end of the microsphere inlet pipe (114) and the microsphere outlet pipe (115) away from the outer side wall of the adsorption tank (111).

5. The purification process for reducing TOC in ammonia according to claim 1, characterized in that: The decomposition mechanism (2) comprises a decomposition tank (21), a second input pipe (22) connected to the decomposition tank (21), a second output pipe (23) connected to the decomposition tank (21), and a separation sleeve (24) installed in the inner cavity of the decomposition tank (21); a mounting flange (211) is installed at one end of the decomposition tank (21); a connecting plug (212) is inserted into the inner thread of the side wall of the mounting flange (211); one end of the separation sleeve (24) is connected to the connecting plug (212), and the other end is passed through the inner cavity of the decomposition tank (21); the separation sleeve (24) is a transparent sleeve; one end of the ultraviolet lamp (27) is installed on the connecting plug (212), and the other end is passed through the inner cavity of the separation sleeve (24).

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