Biological fermentation waste gas treatment system

Abstract

The utility model relates to the field of waste gas treatment, in particular to a biological fermentation waste gas treatment system which comprises a water-sealed tank, a photocatalytic oxidation device, an oxidation absorption tower, an alkali absorption tower, an induced draft fan and an exhaust funnel which are sequentially connected. The waste gas is subjected to oxidation reaction through the arrangement of an ultraviolet lamp and a catalyst, and an oxidation step is added on the basis of an oxidation absorption tower, so that the biological waste gas is more comprehensively and efficiently treated, and the components which are not suitable for being discharged in the biological fermentation waste gas can be better removed; the treatment effect of the device on the biological fermentation waste gas is improved, so that the waste gas treated by the device is more environment-friendly, and the discharged waste gas can stably reach the emission standard for a long time.

Description

Technical Field

[0001] The utility model relates to the field of waste gas treatment, in particular to a biological fermentation waste gas treatment system. Background Art

[0002] At present, biological fermentation has good applications and great contributions in many fields, including food industry, medicine, agriculture, environmental protection, etc., and a large amount of waste gas will be generated during biological fermentation, and the waste gas components mainly include carbon dioxide, organic volatile compounds (VOCs), dust, water vapor, etc.

[0003] The waste gas produced during the bio-fermentation process has complex components, mainly coming from the tail gas emissions from the fermentation tanks and the organic solvent waste gas generated during the separation, extraction, and refining production processes. These waste gases contain a variety of components, such as carbon dioxide, water vapor, and organic volatile compounds (VOCs). Specifically, the components that may be contained in bio-fermentation waste gas include:

[0004] VOCs: including acetone, butyl ester, butanol, ethyl acetate, benzene, toluene, xylene, methanol, n-propanol, dichloromethane, tetrahydrofuran, ether, etc.

[0005] Dust and water vapor: The exhaust gas after spray drying contains dust and water vapor.

[0006] Other ingredients: There may be a sweet fermentation smell around fermentation factories, which is mainly because the exhaust gas contains H2S, organic waste gas, etc.

[0007] Furthermore, bio-fermentation waste gas may contain harmful components such as ammonia, hydrogen sulfide, and methane. Directly releasing these components into the atmosphere can severely impact the surrounding environment and even threaten the health of residents. To effectively treat these waste gases, existing technologies often rely on a single acid-base spray process before discharge. However, this single process is incapable of effectively removing these gases, necessitating the development of a bio-fermentation waste gas treatment system. Utility Model Content

[0008] The purpose of this utility model is to provide a biological fermentation waste gas treatment system, so that the treatment of biological fermentation waste gas is not limited to the acid and alkali spraying method, and can more comprehensively and effectively treat biological fermentation waste gas to solve existing technical defects and unmet technical requirements.

[0009] To achieve the above objectives, the present invention provides the following technical solutions: a biological fermentation waste gas treatment system, comprising:

[0010] A water seal tank, wherein multiple layers of stainless steel wire mesh are provided in the water seal tank;

[0011] A photocatalytic oxidation device, wherein the air inlet of the photocatalytic oxidation device is connected to the air outlet of the water seal tank;

[0012] an oxidation absorption tower, wherein the air inlet of the oxidation absorption tower is connected to the air outlet of the photocatalytic oxidation device;

[0013] an alkali absorption tower, wherein the air inlet of the alkali absorption tower is connected to the air outlet of the oxidation absorption tower;

[0014] An induced draft fan, one end of which is connected to the alkaline absorption tower, and the other end of which is connected to an exhaust pipe.

[0015] In this application, the operating steps adapted to this application are:

[0016] Preferably, the water seal tank comprises: step 1: the collected waste gas enters the water seal tank, the waste gas is passed into water, the waste gas is fully contacted with the water and absorbed, and the unabsorbed waste gas is discharged from the top;

[0017] Step 2: The exhaust gas discharged from the water seal tank enters the photocatalytic oxidation device, where an oxidation reaction occurs under the action of the ultraviolet lamp layer and the catalyst;

[0018] Step 3: The waste gas treated in step 2 is then passed into an oxidation absorption tower, where the strong oxidant in the oxidation absorption tower further oxidizes the waste gas into acidic small molecules;

[0019] Step 4: The waste gas treated in step 3 is then passed into an alkali absorption tower, where the acid-soluble substances in the waste gas and the small molecular organic acids generated after oxidation are absorbed by the alkali;

[0020] Step 5: The waste gas after the above treatment is sent to the exhaust pipe at least 15m away through the induced draft fan and discharged in compliance with the standards;

[0021] Step 6: The absorption liquid in the oxidation absorption tower and the alkali absorption tower can be circulated through the circulation pumps respectively provided therein, and finally discharged into the sewage pool regulating tank for treatment.

[0022] Water seal tank body;

[0023] A water seal tank air inlet, the water seal tank air inlet is arranged on one side of the water seal tank body, and a water seal tank air inlet pipe is provided at the water seal tank air inlet, one end of the water seal tank air inlet pipe is connected to the water seal tank air inlet, and the other end extends toward the bottom of the water seal tank body to below the stainless steel wire mesh;

[0024] A first overflow port is provided on one side of the water seal tank body and below the air inlet of the water seal tank;

[0025] The water seal tank air outlet is arranged at the top of the water seal tank body.

[0026] Preferably, the photocatalytic oxidation device comprises:

[0027] A photocatalytic oxidation body, wherein the photocatalytic oxidation body is arranged in a horizontal form and is provided with a photocatalytic oxidation air inlet and a photocatalytic oxidation air outlet, wherein the photocatalytic oxidation air inlet and the photocatalytic oxidation air outlet are arranged at two ends of the photocatalytic oxidation body;

[0028] At least one set of filter screen, ultraviolet lamp layer, catalyst layer and ultraviolet lamp layer are sequentially arranged between the photocatalytic oxidation air inlet and the photocatalytic oxidation air outlet.

[0029] Preferably, the oxidation absorption tower and the alkali absorption tower both include an absorption tower body, the top of the absorption tower is provided with an absorption tower air outlet, and the side of the absorption tower near the bottom is provided with an absorption tower air inlet;

[0030] At least one group of packing layers, a spray layer, a first demisting layer and a second demisting layer are sequentially arranged in the absorption tower body from bottom to top.

[0031] It should be emphasized that the structures of the oxidation absorption tower and the alkaline absorption tower in this application are the same, but the absorption liquids between the two are different. The oxidant in the oxidation absorption tower is sodium hypochlorite solution, while the alkaline solution in the alkaline absorption tower is sodium hydroxide solution.

[0032] Preferably, the packing layer comprises:

[0033] A packing support plate, the packing support plate being arranged above the air inlet of the absorption tower;

[0034] The filler is placed on the filler support plate in a random pile or in a whole stack, and the filler is a Φ50 polyhedral hollow ball.

[0035] Preferably, the spray layer includes:

[0036] The spray pipe is connected to the circulating water tank arranged on one side of the absorption tower body, and the circulating water tank is connected to the absorption tower body; it should be noted that the flow of the liquid in this application is driven by a driving device, that is, a water pump, and the driving device includes an automatic water replenishment device, an automatic water inlet device and an automatic medicine inlet device in the circulating water tank, and the exhaust gas is driven by a fan, but both water pumps and fans are commonly used technical means in this field, so they are not specifically limited, but it is explained here that the fluid flow is driven.

[0037] Nozzles are evenly distributed on the spray pipe, and the nozzles are spiral nozzles.

[0038] Preferably, the first demisting layer comprises:

[0039] A demisting filler support plate, the demisting filler support plate being arranged above the spray pipe;

[0040] Demisting filler, the demisting filler is placed on the demisting filler support plate in a random pile or a whole pile manner, and the demisting filler is a polyhedral hollow ball of Φ38;

[0041] The second demisting layer is configured as a wire mesh demisting device, and the wire mesh demisting device is disposed below the air outlet of the absorption tower.

[0042] In the present application, when the waste gas passes through the oxidation absorption tower and the alkaline absorption tower, the absorption liquid is sprinkled onto the packing from the nozzle and flows down along the surface of the packing. The gas enters from the air inlet of the absorption tower, is in a countercurrent state relative to the liquid, and continuously passes through the gaps of the packing. On the surface of the packing, the gas and liquid phases are in close contact for mass transfer, and then further pass through the first and second demisting layers for demisting, and finally discharged from the air outlet of the absorption tower.

[0043] Preferably, the water seal tank body is further provided with:

[0044] An observation port is provided on the side wall of the water seal tank body for observing the internal operating environment of the water seal tank body;

[0045] Liquid level gauge ports, the liquid level gauge ports are respectively arranged on the side wall close to the top of the water seal tank body and on the side wall close to the bottom of the water seal tank body;

[0046] The drain outlet is arranged on the side wall of the water seal tank body, and the height of the drain outlet is lower than the height of the liquid level gauge port.

[0047] Preferably, the circulating water tank is provided with:

[0048] A water supply port, wherein the water supply port is provided with an automatic water supply device, and at least one drug adding port is provided on one side of the water supply port, wherein the drug adding port is provided with an automatic drug adding device;

[0049] The water outlet is arranged on one side of the circulating water tank close to the bottom, and an automatic drainage device is provided at the water outlet.

[0050] Preferably, the oxidation absorption tower and the alkali absorption tower are further provided with:

[0051] Manhole sight glasses, which are evenly distributed on the side walls of the absorption tower body and are used to observe the operating environment inside the absorption tower body;

[0052] A feed inlet is provided at the top of the absorption tower body and is used to replenish fillers and demisting fillers;

[0053] A discharge port is provided on the side wall of the absorption tower body on one side of the packing layer and the first demisting layer, and is used for removing the packing and the demisting packing;

[0054] A pH detection port is provided at the pH detection port, and the pH meter is connected to the automatic dosing device to promptly feed back the pH value of the absorption liquid in the absorption tower body to the automatic dosing device;

[0055] Liquid level ports, at least two of which are provided, and are respectively provided on the absorption tower body near the top of the water tank and the absorption tower body near the bottom of the water tank. The liquid level ports are both lower than the air inlet of the absorption tower, and a liquid level gauge is provided at the liquid level port, which is respectively connected to the automatic water replenishment device and the automatic drainage device, and is used to feedback the liquid level height of the absorption liquid in the absorption tower. It should be emphasized that the bottom of the circulating water tank in this application is located in the same plane as the bottom of the absorption tower body. Therefore, in the above content, although the liquid level port is provided on the absorption tower body, the circulating water tank can be used as the position definition standard.

[0056] It should be noted that the application itself involves a variety of automatic devices, measuring devices and driving devices. The above-mentioned types of devices are all controlled by control systems commonly used in the prior art, including automatic dosing devices, automatic water replenishing devices and automatic drug application devices, etc. Since they are all commonly used technical means in their respective fields, they will not be further elaborated here.

[0057] Compared with the prior art, the beneficial effects of the present invention are:

[0058] 1. This application further effectively treats the components in the exhaust gas by adding a water seal tank and a photocatalytic oxidation device on the basis of the acid-base spray tower, and causes the exhaust gas to undergo an oxidation reaction through the setting of ultraviolet lamps and catalysts. An oxidation step is added on the basis of the oxidation absorption tower, and the biological exhaust gas is more comprehensively and efficiently treated. It can better remove components in the biological fermentation exhaust gas that are not suitable for direct discharge, thereby improving the treatment effect of this application on the biological fermentation exhaust gas, making the exhaust gas treated by this application more environmentally friendly and able to remain stable at the emission standard for a long time after discharge.

[0059] 2. This application further sets up a first demisting layer and a second demisting layer to reduce the impact of tiny particles brought up during the work process on the normal work, improve the exhaust gas treatment effect, further ensure the emission standards, and use multi-faceted hollow balls as fillers for the packing layer and the demisting packing layer to increase the gas-liquid contact area and improve the mass transfer efficiency.

[0060] 3. This application makes the equipment simple and easy to operate by setting up a circulating water tank, an automatic dosing device, an automatic water replenishing device and an automatic drainage device, so that the absorption liquid can be fully utilized, which is environmentally friendly, reduces operating costs, and has a high fault tolerance rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0062] Figure 2 This is a schematic diagram of the overall structure of the water sealing tank in the utility model;

[0063] Figure 3 This is a schematic diagram of the internal structure of the photocatalytic oxidation device in the present utility model;

[0064] Figure 4 This is a schematic diagram of the overall structure of the photocatalytic oxidation device in the present utility model;

[0065] Figure 5 This is a schematic diagram of the overall structure of the oxidation absorption tower and the alkali absorption tower in the present invention;

[0066] In the figure: water seal tank 1, photocatalytic oxidation device 2, oxidation absorption tower 3, alkali absorption tower 4, induced draft fan 5, wire mesh 6, water seal tank body 7, water seal tank air inlet 8, water seal tank air inlet pipe 9, first overflow port 10, water seal tank air outlet 11, photocatalytic oxidation body 12, photocatalytic oxidation air inlet 13, photocatalytic oxidation air outlet 14, filter 15, ultraviolet lamp layer 16, catalyst layer 17, absorption tower body 18, absorption tower air outlet 19, absorption tower air inlet 20 , packing layer 21, spray layer 22, first demisting layer 23, second demisting layer 24, packing support plate 25, packing 26, spray pipe 27, circulating water tank 28, nozzle 29, demisting packing support plate 30, demisting packing 31, observation port 32, liquid level gauge port 33, drain port 34, water supply port 35, dosing port 36, water outlet 37, manhole sight glass 38, lamp tube rectifier 39, unloading port 40, pH detection port 41, liquid level port 42, second overflow port. DETAILED DESCRIPTION

[0067] The following is a combination of the appended examples of the present invention Figure 1-5 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0068] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features.

[0069] See also Figure 1-5 , embodiments of the present utility model:

[0070] Example:

[0071] like Figure 1 Shown: A biological fermentation waste gas treatment system, comprising:

[0072] A water seal tank 1, wherein multiple layers of stainless steel wire mesh 6 are provided in the water seal tank 1;

[0073] A photocatalytic oxidation device 2, wherein the air inlet of the photocatalytic oxidation device 2 is connected to the air outlet of the water seal tank 1;

[0074] an oxidation absorption tower 3, wherein the air inlet of the oxidation absorption tower 3 is connected to the air outlet of the photocatalytic oxidation device 2;

[0075] an alkali absorption tower 4, wherein the air inlet of the alkali absorption tower 4 is connected to the air outlet of the oxidation absorption tower 3;

[0076] The induced draft fan 5 has one end connected to the alkaline absorption tower and the other end connected to the exhaust pipe.

[0077] In this application, the operating steps adapted to this application are:

[0078] like Figure 2 As shown, the water seal tank 1 comprises: step 1: the collected waste gas enters the water seal tank 1, and the waste gas is passed into water, so that the waste gas is fully contacted with the water and absorbed, and the unabsorbed waste gas is discharged from the top;

[0079] Step 2: The exhaust gas discharged from the water seal tank 1 enters the photocatalytic oxidation device 2, and an oxidation reaction occurs under the action of the ultraviolet lamp layer 16 and the catalyst;

[0080] Step 3: The waste gas treated in step 2 is then passed into the oxidation absorption tower 3, where the strong oxidant in the oxidation absorption tower 3 further oxidizes the waste gas into acidic small molecular substances;

[0081] Step 4: The waste gas treated in step 3 is passed into the alkali absorption tower 4, where the acid-soluble substances in the waste gas and the small molecular organic acids generated after oxidation are absorbed by the alkali;

[0082] Step 5: The waste gas after the above treatment is sent to the exhaust pipe 15m away through the induced draft fan 5 and discharged in compliance with the standards;

[0083] Step 6: The absorption liquid in the oxidation absorption tower 3 and the alkali absorption tower 4 can be circulated through the circulation pumps respectively provided therein, and finally discharged into the sewage pool regulating tank for treatment.

[0084] The water seal tank body 7 is made of 304 stainless steel.

[0085] A water seal tank air inlet 8 is provided on one side of the water seal tank body 7, and a water seal tank air inlet pipe 9 is provided at the water seal tank air inlet 8. One end of the water seal tank air inlet pipe 9 is connected to the water seal tank air inlet 8, and the other end extends toward the bottom of the water seal tank body 7 to below the stainless steel wire mesh 6;

[0086] A first overflow port 10 is provided on one side of the water seal tank body 7 and below the air inlet 8 of the water seal tank;

[0087] The water seal tank air outlet 11 is provided at the top of the water seal tank body 7 .

[0088] like Figure 3 and 4 As shown, the photocatalytic oxidation device 2 includes:

[0089] The photocatalytic oxidation body 12 is arranged in a horizontal form, and a photocatalytic oxidation air inlet 13 and a photocatalytic oxidation air outlet 14 are provided on the photocatalytic oxidation body 12. The photocatalytic oxidation air inlet 13 and the photocatalytic oxidation air outlet 14 are relatively arranged at the two ends of the photocatalytic oxidation body 12; the photocatalytic oxidation body 12 is made of stainless steel 304.

[0090] At least one set of filter screen 15 , ultraviolet lamp layer 16 , catalyst layer 17 and ultraviolet lamp layer 16 are sequentially arranged between the photocatalytic oxidation air inlet 13 and the photocatalytic oxidation air outlet 14 .

[0091] Specifically, in this embodiment, the filter 15 is made of stainless steel and is arranged in sequence from the catalytic oxidation air inlet to the photocatalytic oxidation air outlet 14, including a filter 15, a UV lamp layer 16, a catalyst layer 17, a UV lamp layer 16, a UV lamp layer 16, a catalyst layer 17 and a UV lamp layer 16.

[0092] The ultraviolet lamp layer 16 is composed of at least an ultraviolet lamp tube, a lamp rectifier 39 and a control circuit. Specifically, the lamp tube is arranged on the inner wall of the photocatalytic oxidizing body 12, and the lamp rectifier 39 is arranged on one side of the photocatalytic oxidizing body 12, and the two are connected by a control circuit.

[0093] The catalyst in the catalyst layer 17 is a titanium dioxide photocatalyst.

[0094] like Figure 1 and 5 As shown, the oxidation absorption tower 3 and the alkali absorption tower 4 both include an absorption tower body 18, an absorption tower gas outlet 19 is provided on the top of the absorption tower, and an absorption tower gas inlet 20 is provided on one side of the absorption tower near the bottom;

[0095] The absorption tower body 18 is provided with at least one group of a packing layer 21, a spray layer 22, a first demisting layer 23 and a second demisting layer 24 in sequence from bottom to top.

[0096] Specifically, in this embodiment, the absorption tower body 18 is provided with a packing layer 21, a spray layer 22, a packing layer 21, a spray layer 22, a first demisting layer 23, and a second demisting layer 24 from bottom to top. This allows for more efficient use of the absorption liquid and sufficient absorption of the exhaust gas, thereby achieving more effective exhaust gas treatment.

[0097] It should be emphasized that the structures of the oxidation absorption tower 3 and the alkali absorption tower 4 in the present application are the same, but the absorption liquids therein are different. The oxidant in the oxidation absorption tower 3 is a sodium hypochlorite solution with a concentration of 10%, while the alkali solution in the alkali absorption tower 4 is a sodium hydroxide solution with a concentration of 30%.

[0098] In this embodiment, the first demisting layer 23 and the second demisting layer 24 can reduce the influence of tiny particles brought up during the waste gas treatment process on the waste gas purification.

[0099] When the absorption liquid in the spray layer 22 flows downward, it tends to gradually concentrate toward the inner wall of the absorption tower body 18, so that the liquid flow near the inner wall of the absorption tower body 18 gradually increases. The liquid flowing down from the packing layer 21 is collected in the circulating water tank 28 and then sent to the spray layer 22 through the spray pipe 27 for recycling, so that the absorption liquid is fully utilized and the operating cost is saved.

[0100] like Figure 5 As shown, the packing layer 21 includes:

[0101] A packing support plate 25, the packing support plate 25 being arranged above the air inlet 20 of the absorption tower;

[0102] The fillers 26 are placed on the filler support plate 25 in a random or stacked manner, and are Φ50 polyhedral hollow balls.

[0103] like Figure 5 As shown, the spray layer 22 includes:

[0104] The spray pipe 27 is connected to the circulating water tank 28 arranged on one side of the absorption tower body 18, and the circulating water tank 28 is connected to the absorption tower body 18; it should be noted that the flow of the liquid in this application is driven by a driving device, that is, a water pump, and the driving device includes an automatic water replenishment device, an automatic water inlet device and an automatic medicine inlet device in the circulating water tank 28, and the exhaust gas is driven by a fan, but both water pumps and fans are commonly used technical means in this field, so they are not specifically limited, but it is explained here that the fluid flow is driven.

[0105] The nozzles 29 are evenly distributed on the spray pipe 27 and are spiral nozzles 29 .

[0106] like Figure 5 As shown, the first demisting layer 23 includes:

[0107] A demisting filler support plate 30, wherein the demisting filler support plate 30 is arranged above the spray pipe 27;

[0108] Demisting fillers 31, which are placed on the demisting filler support plate 30 in a random or stacked manner, and are polyhedral hollow balls with a diameter of 38;

[0109] The second demisting layer 24 is configured as a wire mesh 6 demisting device, and the wire mesh 6 demisting device is arranged below the air outlet 19 of the absorption tower.

[0110] In the present application, when the exhaust gas passes through the oxidation absorption tower 3 and the alkaline absorption tower 4, the absorption liquid is sprinkled from the nozzle 29 onto the packing 26 and flows down along the surface of the packing 26. The gas enters from the air inlet of the absorption tower and is in a countercurrent state relative to the liquid. It continuously passes through the gaps of the packing 26. On the surface of the packing 26, the gas and liquid phases are in close contact for mass transfer, and then further pass through the first and second demisting layers for demisting, and finally discharged from the air outlet 19 of the absorption tower.

[0111] like Figure 2 As shown, the water seal tank body 7 is also provided with:

[0112] An observation port 32 is provided on the side wall of the water seal tank body 7 and is used to observe the internal operating environment of the water seal tank body 7;

[0113] Liquid level gauge ports 33, which are respectively provided on the side wall near the top of the water seal tank body 7 and on the side wall near the bottom of the water seal tank body 7;

[0114] The drain port 34 is provided on the side wall of the water seal tank body 7 , and the height of the drain port 34 is lower than the height of the liquid level gauge port 33 .

[0115] like Figure 5 As shown, the circulating water tank 28 is provided with:

[0116] A water replenishing port 35 is provided with an automatic water replenishing device, and at least one drug adding port 36 is provided on one side of the water replenishing port 35, and an automatic drug adding device is provided at the drug adding port 36;

[0117] The water outlet 37 is provided on one side of the circulating water tank 28 near the bottom, and an automatic drainage device is provided at the water outlet 37 .

[0118] like Figure 5 As shown, the oxidation absorption tower 3 and the alkali absorption tower 4 are also provided with:

[0119] Manhole sight glasses 38, which are evenly distributed on the side walls of the absorption tower body 18 and are used to observe the operating environment inside the absorption tower body 18;

[0120] A feed inlet is provided at the top of the absorption tower body 18 for replenishing the filler 26 and the demisting filler 31;

[0121] A discharge port 40 is provided on a side wall of the absorption tower body 18 on one side of the packing layer 21 and the first demisting layer 23, and is used for removing the packing 26 and the demisting packing 31;

[0122] PH detection port 41, a PH meter is provided at the PH detection port, and the PH meter is connected to the automatic dosing device for timely feedback of the pH value of the absorption liquid in the absorption tower body 18 to the automatic dosing device; specifically, in this embodiment, the PH detection port 41 is set as a 45° inclined socket, and the PH meter is obliquely inserted into the absorption liquid from the PH detection port 41, and the automatic dosing device includes at least a dosing pipe, a dosing pump, a dosing barrel and a control unit, one end of the dosing pipe is connected to the dosing port 36, and the other end is connected to the dosing pump, and the dosing pump is provided in the dosing barrel, the control unit is electrically connected to the dosing pump and the PH meter, and the pH value fed back to the control unit by the PH meter controls the dosing pump to add medicine. Specifically, the pH is controlled at 9-12, and the dosing pump is started to automatically add medicine when the pH value is lower than 9, and the dosing pump is turned off when the pH value reaches 12.

[0123] There are at least two liquid level ports 42, and the liquid level ports 42 are respectively arranged on the absorption tower body 18 near the top of the water tank and on the absorption tower body 18 near the bottom of the water tank. The liquid level ports 42 are all lower than the absorption tower air inlet 20, and a liquid level gauge is provided at the liquid level port 42. The liquid level gauge is respectively connected to the automatic water replenishment device and the automatic drainage device to feedback the liquid level height of the absorption liquid in the absorption tower. It should be emphasized that in this application, the bottom of the circulating water tank 28 is located in the same plane as the bottom of the absorption tower body 18. Therefore, in the above content, although the liquid level port 42 is provided on the absorption tower body 18, the circulating water tank 28 can be used as the position limit standard.

[0124] The second overflow port 43 is provided on the side wall of the absorption tower body 18. The height of the second overflow port 43 is set according to the highest liquid level of the absorption liquid in the absorption tower, that is, the second overflow port 43 is slightly higher than the highest liquid level of the absorption liquid, which is used to tolerate the fault of the automatic water replenishment device. That is, if the device fails and continues to replenish water, the absorption liquid that exceeds the highest set liquid level of the absorption liquid will leak out from the second overflow port 43, preventing the absorption liquid level in the absorption tower body 18 from continuing to rise and damaging other components.

[0125] Specifically, in the present application, the liquid level gauge in the higher position liquid level port 42 is connected to the automatic drainage device, and the liquid level gauge in the lower position liquid level port 42 is connected to the automatic water replenishment device, but in actual settings, the automatic water replenishment device and the automatic drainage device can be controlled by a control unit, that is, when the water level is high, the control unit controls the drainage, and when the water level is low, the automatic water replenishment device is controlled to replenish water.

[0126] Specifically, the automatic drainage system includes at least a liquid level gauge with a signal output, a water replenishment electric valve, and a control unit. The drain electric valve is located at the absorber water replenishment port 35. The control unit is electrically connected to the liquid level gauge and the water replenishment electric valve. The control unit controls the opening and closing of the drain electric valve based on the signal feedback from the higher-position liquid level gauge. The control unit also includes a set automatic drainage program. Specifically, the automatic drainage time is set to 168 hours. When the time is up, the drain electric valve opens. When the liquid level is low, the drain electric valve closes. Timely replacement of the absorption liquid ensures efficient operation of the treatment system.

[0127] The automatic water replenishment device includes at least a water replenishment pipe, an automatic water replenishment pump, a water tank, and a control unit. One end of the water replenishment pipe is connected to the water replenishment port 35, and the other end is connected to the automatic water replenishment pump. The automatic water replenishment pump is set in the water tank. The control unit is electrically connected to the liquid level meter and the automatic water replenishment pump. The control unit controls the opening and closing of the automatic water replenishment pump based on the signal fed back by the liquid level meter. Specifically, the water replenishment valve is opened when the water level is lower than 200mm, and the water replenishment valve is closed when the water level reaches 600mm. The control unit can be combined with the control unit in the automatic drainage device to form one.

[0128] It should be noted that the embodiments involve a variety of automatic devices, measuring devices and driving devices. The above-mentioned types of devices are all controlled by control systems commonly used in the prior art, including automatic dosing devices, automatic water replenishing devices and automatic drug application devices, etc. Since they are all commonly used technical means in their respective fields, they will not be further described here.

[0129] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0130] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A biological fermentation waste gas treatment system, characterized in that: include: A water seal tank (1), wherein multiple layers of stainless steel wire mesh (6) are provided in the water seal tank (1); A photocatalytic oxidation device (2), wherein the air inlet of the photocatalytic oxidation device (2) is connected to the air outlet of the water seal tank (1); an oxidation absorption tower (3), wherein the air inlet of the oxidation absorption tower (3) is connected to the air outlet of the photocatalytic oxidation device (2); an alkali absorption tower (4), wherein the air inlet of the alkali absorption tower (4) is connected to the air outlet of the oxidation absorption tower (3); An induced draft fan (5) is connected to the alkaline absorption tower at one end and is connected to an exhaust pipe at the other end.

2. A biological fermentation waste gas treatment system according to claim 1, characterized in that: The water seal tank (1) comprises: Water seal tank body (7); A water seal tank air inlet (8), the water seal tank air inlet (8) is arranged on one side of the water seal tank body (7), and a water seal tank air inlet pipe (9) is arranged at the water seal tank air inlet (8), one end of the water seal tank air inlet pipe (9) is connected to the water seal tank air inlet (8), and the other end extends toward the bottom of the water seal tank body (7) to the bottom of the stainless steel wire mesh (6); A first overflow port (10), the first overflow port (10) being arranged on one side of the water seal tank body (7), and the first overflow port (10) being arranged below the air inlet (8) of the water seal tank; A water seal tank air outlet (11), wherein the water seal tank air outlet (11) is arranged at the top of the water seal tank body (7).

3. A biological fermentation waste gas treatment system according to claim 2, characterized in that: The photocatalytic oxidation device (2) comprises: A photocatalytic oxidation body (12), wherein the photocatalytic oxidation body (12) is arranged in a horizontal form, and a photocatalytic oxidation air inlet (13) and a photocatalytic oxidation air outlet (14) are provided on the photocatalytic oxidation body (12), and the photocatalytic oxidation air inlet (13) and the photocatalytic oxidation air outlet (14) are arranged at two ends of the photocatalytic oxidation body (12) relative to each other; At least one set of filter screens (15), ultraviolet lamp layers (16), catalyst layers (17) and ultraviolet lamp layers (16) are sequentially arranged between the photocatalytic oxidation air inlet (13) and the photocatalytic oxidation air outlet (14).

4. A biological fermentation waste gas treatment system according to claim 3, characterized in that: The oxidation absorption tower (3) and the alkali absorption tower (4) both include an absorption tower body (18), an absorption tower air outlet (19) is provided on the top of the absorption tower, and an absorption tower air inlet (20) is provided on one side of the absorption tower near the bottom; The absorption tower body (18) is provided with at least one group of a packing layer (21), a spray layer (22), a first demisting layer (23) and a second demisting layer (24) in sequence from bottom to top.

5. A biological fermentation waste gas treatment system according to claim 4, characterized in that: The packing layer (21) comprises: a filler support plate (25), the filler support plate (25) being arranged above the air inlet (20) of the absorption tower; The filler (26) is placed on the filler support plate (25) in a random pile or a whole pile manner, and the filler (26) is a Φ50 polyhedral hollow ball.

6. A biological fermentation waste gas treatment system according to claim 4 or 5, characterized in that: The spray layer (22) comprises: a spray pipe (27), wherein the spray pipe (27) is in communication with a circulating water tank (28) provided on one side of the absorption tower body (18), and the circulating water tank (28) is in communication with the absorption tower body (18); Nozzles (29), the nozzles (29) are evenly distributed on the spray pipe (27), and the nozzles (29) are spiral nozzles.

7. A biological fermentation waste gas treatment system according to claim 6, characterized in that: The first demisting layer (23) comprises: a demisting filler support plate (30), wherein the demisting filler support plate (30) is arranged above the spray pipe (27); Demisting filler (31), the demisting filler (31) is placed on the demisting filler support plate (30) in a random pile or a whole pile manner, and the demisting filler (31) is a polyhedral hollow sphere with a diameter of Φ38; The second demisting layer (24) is configured as a wire mesh demisting device, and the wire mesh demisting device is disposed below the air outlet (19) of the absorption tower.

8. A biological fermentation waste gas treatment system according to claim 1, 2, 3, 4, 5 or 7, characterized in that: The water seal tank body (7) is also provided with: An observation port (32), the observation port (32) being provided on the side wall of the water seal tank body (7) and being used for observing the internal operating environment of the water seal tank body (7); Liquid level gauge ports (33), the liquid level gauge ports (33) being respectively arranged on the side wall close to the top of the water seal tank body (7) and on the side wall close to the bottom of the water seal tank body (7); A drain port (34) is provided on the side wall of the water seal tank body (7), and the height of the drain port (34) is lower than the height of the liquid level gauge port (33).

9. A biological fermentation waste gas treatment system according to claim 7, characterized in that: The circulating water tank (28) is provided with: A water replenishing port (35), wherein the water replenishing port (35) is provided with an automatic water replenishing device, and at least one drug adding port (36) is provided on one side of the water replenishing port (35), wherein the drug adding port (36) is provided with an automatic drug adding device; A water outlet (37) is provided on one side of the circulating water tank (28) close to the bottom, and an automatic drainage device is provided at the water outlet (37).

10. A biological fermentation waste gas treatment system according to claim 9, characterized in that: The oxidation absorption tower (3) and the alkali absorption tower (4) are further provided with: Manhole sight glasses (38), the manhole sight glasses (38) are evenly distributed on the side wall of the absorption tower body (18) and are used to observe the operating environment inside the absorption tower body (18); A feed inlet is provided at the top of the absorption tower body (18) and is used for replenishing the filler (26) and the demisting filler (31); A discharge port (40) is provided on a side wall of the absorption tower body (18) on one side of the packing layer (21) and the first demisting layer (23), and is used for removing the packing (26) and the demisting packing (31); A pH detection port (41) is provided at the pH detection port, wherein a pH meter is connected to an automatic dosing device and is used to promptly feed back the pH value of the absorption liquid in the absorption tower to the automatic dosing device; At least two liquid level ports (42) are provided, and the liquid level ports (42) are respectively provided on the absorption tower main body (18) near the top of the water tank and on the absorption tower main body (18) near the bottom of the water tank. The liquid level ports (42) are all lower than the absorption tower air inlet (20), and a liquid level gauge is provided at the liquid level port (42). The liquid level gauge is respectively connected to the automatic water replenishment device and the automatic drainage device, and is used to feedback the liquid level height of the absorption liquid in the absorption tower main body (18).

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