Online waste gas biodegradation device and degradation method

Abstract

The invention discloses an online waste gas biodegradation device and an online waste gas biodegradation method. The degradation device comprises a biodegradation pretreatment reactor, a biodegradation system reactor, a gas-water separator and an induced draft fan which are connected in sequence, a protruding beak baffle and two spray headers are arranged at the upper part in the biodegradation pretreatment reactor; a plurality of baffles are arranged in the biodegradation system reactor at intervals, and channels are formed in the baffles in an up-down staggered manner; filler is arranged between every two adjacent baffles, and a spraying head is arranged above the filler. The degradation method comprises the following steps: waste gas firstly enters the biodegradation pretreatment reactor for gas-liquid mixing, then enters the biodegradation system reactor for biodegradation, then is separated by the gas-water separator to obtain water vapor, and finally is discharged by the induced draft fan. The on-line waste gas biodegradation device and the degradation method solve the problem of on-line degradation of VOCs, and have the characteristics of high degradation efficiency, low operation cost, high safety, normal-temperature treatment, simplicity in operation and maintenance, low maintenance cost and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of waste gas treatment, and relates to a waste gas biodegradation device and a degradation method, and in particular to an online waste gas biodegradation device and a degradation method. Background Art

[0002] Painting is a high-energy consumption and high-pollution link in the automotive manufacturing industry. During the spraying process, the waste gas generated by oil-based paints is mainly volatile organic compounds (VOCs), including benzene, toluene and xylene, which are harmful to the human body; while the VOCs contained in water-based paints are mainly hydrocarbons, halogenated hydrocarbons, oxygen hydrocarbons and nitrogen hydrocarbons. With the increasing improvement and strengthening of national environmental protection laws and regulations and energy-saving and emission reduction measures, choosing the appropriate waste gas treatment method to reduce VOC emissions is what every spraying company and environmental protection equipment company should do.

[0003] In the prior art, the main treatment methods for treating organic waste gas from painting include RCO catalytic combustion and RTO regenerative combustion.

[0004] The working principle of the RCO catalytic combustion method is: first, some dust particles in the organic waste gas are removed by a dry filter, and then the organic waste gas that meets the adsorption conditions is sent to the activated carbon adsorption box for adsorption purification, and the purified clean gas is discharged into the atmosphere through the main exhaust fan. Usually, the adsorption device is equipped with a set of spare adsorption boxes. When the activated carbon is saturated with adsorption, it is switched to the catalytic combustion desorption state through the control valve. The desorption regeneration system adopts online desorption regeneration or offline desorption regeneration, that is, the adsorption process is a continuous treatment process. When the spare adsorption device is put into use, the saturated adsorption box performs desorption work. After desorption, the activated carbon box is ready for the next cycle. The concentration of the desorbed organic matter is increased by dozens of times compared with the original one and sent to the catalytic combustion chamber for catalytic combustion reaction. Usually, the reaction is carried out under the condition of catalyst surface temperature of 200-350℃, so that high-concentration pollutants are converted into harmless water and carbon dioxide. Its disadvantages are limited waste gas treatment capacity; when the waste gas contains sticky substances, the activated carbon is not easy to desorb, shortening the service life; the core unit catalyst (precious metal) is easy to poison and fail. The replaced activated carbon is hazardous waste, causing secondary pollution.

[0005] The working principle of the RTO regenerative combustion method: First, after being heated by the regenerative ceramic, the temperature of the organic waste gas discharged from the production rises rapidly, and then enters the furnace and is heated by the combustion of gas, the temperature reaches 680-1050°C, so that the VOCs in the organic waste gas are directly decomposed into carbon dioxide and water vapor at this high temperature, forming odorless high-temperature flue gas, and then flows through the low-temperature regenerative ceramic. A large amount of heat energy is transferred from the flue gas to the regenerative body to heat the organic waste gas to be decomposed in the next cycle. The temperature of the high-temperature flue gas itself drops significantly, and then heat is exchanged with other media through the heat recovery system. The flue gas temperature is further reduced and finally discharged to the outdoor atmosphere. The one-time investment cost of RTO technology is high, the equipment maintenance cost is high, the operating temperature is high, the requirements for insulation and other hardware are high, a large amount of gas is consumed, and carbon emissions are increased.

[0006] The biological degradation methods of Vocs provided by the prior art cannot meet the needs of painting waste gas treatment. Basically, they all use organisms as auxiliary, or need to collect waste gas before processing, which cannot meet the needs of enterprises for continuous production and online degradation of Vocs. For example, the device in Chinese invention patent 202320759284.7 can only handle very small air volumes. The technology of combining low-temperature plasma with biology to treat difficult-to-degrade organic waste gas first requires collecting the gas and then degrading it, and the plasma equipment requires a high-voltage power supply, which is dangerous. In addition, the main function of the biodegradation devices (such as trickling towers, filter towers or washing towers) used in the prior art is to remove dust and deodorize, and cannot degrade Voc. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an online waste gas biodegradation device and degradation method for online adsorption and degradation of organic waste gas with high degradation efficiency, low operating cost, high safety, room temperature treatment, simple operation and maintenance, and low maintenance cost.

[0008] The technical solution adopted by the present invention to solve the technical problem is:

[0009] The invention discloses an online waste gas biodegradation device, comprising a biodegradation pretreatment reactor, a biodegradation system reactor, a gas-water separator and an induced draft fan which are connected in sequence; a certain amount of liquid biological bacteria solution is contained in the biodegradation pretreatment reactor and the biodegradation system reactor; waste gas inlet and waste gas outlet are arranged on both sides of the biodegradation pretreatment reactor and the biodegradation system reactor; a protruding bird-mouth baffle and two spray heads are arranged on the upper part of the biodegradation pretreatment reactor; a plurality of baffles are arranged in intervals in the biodegradation system reactor, and channels on the baffles are arranged in an upper and lower staggered manner; fillers are arranged between adjacent baffles, and spray heads are arranged above the fillers.

[0010] Furthermore, the first baffle, the second baffle, the third baffle, the fourth baffle, the fifth baffle, the sixth baffle and the seventh baffle are arranged in intervals in the biodegradation system reactor, the first baffle has a channel at the lower end of the upper sealed end, the second baffle has a channel at the upper sealed end, the third baffle has a channel at the lower end of the upper sealed end, the fourth baffle has a channel at the upper sealed end, the fifth baffle has a channel at the lower end of the upper sealed end, the sixth baffle has a channel at the upper sealed end, and the seventh baffle has a channel at the lower sealed end; a first filler and a spray head above it are provided between the first baffle and the second baffle, and a first filler and a spray head above it are provided between the second baffle and the third baffle. The space between the first baffle plate and the inner wall of the biodegradation system reactor is empty, the second row of fillers and the spray head above it are arranged between the third baffle plate and the fourth baffle plate, the space between the fourth baffle plate and the fifth baffle plate is empty, the third row of fillers and the spray head above it are arranged between the fifth baffle plate and the sixth baffle plate, and the space between the sixth baffle plate and the seventh baffle plate is empty; an air inlet channel is between the first baffle plate and the inner wall of the biodegradation system reactor, and the top side of the air inlet channel is connected to the waste gas inlet of the biodegradation system reactor; an air outlet channel is between the seventh baffle plate and the inner wall of the biodegradation system reactor, and the top of the air outlet channel is connected to the waste gas outlet of the biodegradation system reactor.

[0011] Furthermore, the biodegradation pretreatment reactor includes a bacterial liquid chamber, and an air inlet pipe is provided at the lower front end of the bacterial liquid chamber; the air inlet pipe includes a connected front vertical section and a rear horizontal section, and an air inlet is provided at the top of the vertical section; a first spray head is provided at the middle of the horizontal section on the air inlet pipe near the air inlet, and a protruding bird's beak baffle is provided at the rear end of the horizontal section on the air inlet pipe near the entrance of the bacterial liquid chamber; a second spray head is provided at the top of the bacterial liquid chamber; and an air outlet is provided at the upper rear end of the bacterial liquid chamber.

[0012] Furthermore, in the biodegradation system reactor, an aeration plate is provided below the filler between adjacent baffles, which is connected to the aeration pipe and the blower in sequence to provide oxygen to the biological bacteria.

[0013] Furthermore, in the biodegradation system reactor, a spray water pump (bacterial liquid circulation pump) is provided below the filler between adjacent baffles and is connected to a spray head above the filler through a spray water pipeline.

[0014] Furthermore, in the biodegradation system reactor, transparent visual windows are provided at the upper and lower parts between adjacent baffles.

[0015] Furthermore, a transparent visual window is provided in the upper part of the bacterial liquid chamber of the biodegradation pretreatment reactor.

[0016] Furthermore, a mesh plate is provided in the gas outlet channel of the biodegradation system reactor.

[0017] Furthermore, the online waste gas biodegradation device also includes a VOC pollution source connected to the waste gas inlet of the biodegradation pretreatment reactor; the VOC pollution source is provided with an air inlet.

[0018] Furthermore, the filler in the biodegradation system reactor is ceramic corrugated structured filler.

[0019] The present invention discloses an online waste gas biodegradation method using the online waste gas biodegradation device as follows: the waste gas, driven by the induced draft fan, first enters the biodegradation pretreatment reactor to mix with the biological bacteria liquid, then enters the biodegradation system reactor to be biodegraded by spraying the biological bacteria liquid, then separates the water vapor through the gas-water separator, and finally is discharged through the induced draft fan; specifically, the following steps are included:

[0020] Step 1: The waste gas first enters the biodegradation pretreatment reactor and mixes with the biological bacteria liquid for gas-liquid mixing. In the air inlet pipe of the biodegradation pretreatment reactor, the gas and liquid are initially contacted and mixed through the first spraying. After the initial contact and mixing of the gas and liquid, they encounter the protruding bird's beak baffle, which produces an explosion mode to fully mix the gas and liquid. After the gas and liquid are mixed, they enter the bacterial liquid chamber and undergo the second spraying to increase the gas-liquid mixing effect.

[0021] Step 2: After the waste gas is pretreated in the biodegradation pretreatment reactor, it enters the biodegradation system reactor and is biodegraded by spraying the biological bacteria liquid; after the waste gas enters the biodegradation system reactor from the waste gas inlet, it encounters the first baffle. Since the upper end of the first baffle is sealed and there is a channel at the lower end, the gas passes from the lower end of the first baffle and is sprayed to the upper end through the filler; then it encounters the second baffle. Since the lower end of the second baffle is sealed and there is a channel at the upper end, the gas runs upward, passes through the first filler and the spray of the first spray head to the upper end, and passes from the upper end of the second baffle; then it encounters the third baffle. Since the upper end of the third baffle is sealed and there is a channel at the lower end, the gas runs downward and passes from the lower end of the third baffle; then it encounters the fourth baffle. Since the lower end of the fourth baffle is sealed and there is a channel at the upper end, the gas goes upward. It runs, passes through the second filler and the second spray head to the upper end, and passes from the upper end of the fourth baffle; then it encounters the fifth baffle, because the upper end of the fifth baffle is sealed and there is a channel at the lower end, the gas runs downward and passes from the lower end of the fifth baffle; then it encounters the sixth baffle, because the lower end of the sixth baffle is sealed and there is a channel at the upper end, the gas runs upward, passes through the third filler and the third spray head to the upper end, and passes from the upper end of the sixth baffle; then it encounters the seventh baffle, because the upper end of the seventh baffle is sealed and there is a channel at the lower end, the gas runs downward and passes from the lower end of the seventh baffle, then enters the gas outlet channel and runs upward, and finally comes out from the exhaust gas outlet; it repeats up and down, passes through three fillers and spray degradation, and finally the exhaust gas coming out of the exhaust gas outlet has been basically fully degraded.

[0022] Step 3: After the waste gas comes out of the biodegradation system reactor, it is separated from the water vapor by the gas-water separator and finally discharged through the induced draft fan.

[0023] Furthermore, VOC waste gas is generated from the VOC pollution source and enters the biodegradation pretreatment reactor and the biodegradation system reactor in sequence for biodegradation (spraying degradation).

[0024] Furthermore, the filler in the biodegradation system reactor is ceramic structured filler; the ceramic structured filler is ceramic corrugated structured filler.

[0025] Furthermore, the biological bacteria liquid used is LW biological bacteria and / or LR biological bacteria.

[0026] Furthermore, the biological bacteria liquid used is LW biological bacteria and LR biological bacteria, and the ratio range of the two bacterial species is set according to the number of bacterial colonies at 1:0.2-5, and the total bacterial colony contains more than 50 million bacteria per milliliter.

[0027] Furthermore, the liquid level of the biological bacteria liquid in the bacterial liquid chamber of the biodegradation pretreatment reactor is not less than 70% of the maximum liquid level preset value; the liquid level of the biological bacteria liquid at the bottom of the biodegradation system reactor is not less than 80% of the maximum liquid level preset value.

[0028] Beneficial effects of the present invention:

[0029] The online waste gas biodegradation device and degradation method of the present invention solves the problem of online degradation of VOCs and has the characteristics of high degradation efficiency, low operating cost, high safety, normal temperature treatment, simple operation and maintenance, and low maintenance cost. After data detection, the VOC concentration at the rear end of the VOC pollution source is 300mg / m 3 The VOC concentration at the outlet of the biodegradation system reactor is basically 12-20 mg / m 3 The degradation efficiency can reach about 93%.

[0030] The online waste gas biodegradation device of the present invention, in a biodegradation pretreatment reactor, makes the cross-sectional area of ​​the air flow passage entering the biodegradation pretreatment reactor smaller than the cross-sectional area of ​​the air inlet pipe by setting the angle, length and number of the bird's beak baffle, resulting in an accelerated flow rate of the gas-liquid mixture passing through the bird's beak baffle; after the gas-liquid mixture enters the bacterial liquid chamber of the biodegradation pretreatment reactor, the flow rate is instantly reduced and the volume is instantly expanded, producing an explosion effect, breaking up bacterial liquid water droplets into smaller pieces, so that the bacterial liquid water droplets are more fully mixed with the gas.

[0031] The online waste gas biodegradation device of the present invention has a plurality of baffles arranged at intervals in the biodegradation system reactor, channels on the baffles are arranged in an up-and-down staggered manner, and multiple fillers and multiple sprays are arranged, so that the waste gas can be more fully degraded.

[0032] The ceramic corrugated structured packing selected in the biodegradation system reactor of the present invention has good hydrophilic properties, and a very thin liquid film turbulence can be formed on the surface of the packing. An inclined tortuous channel for airflow is preset inside the packing, which can promote the airflow but does not block the airflow. By setting the spraying speed and the airflow velocity, the airflow flows through the inclined tortuous channel preset in the packing; the surface structure of the packing has good wetting properties, and by selecting packings with different specific surface areas, it is not only beneficial to the survival of microorganisms, but also can accelerate the flow of liquid and minimize the amount of liquid stagnation in the packing, thereby reducing the chances of overheating, polymerization and coking.

[0033] The online biodegradation spraying hazardous waste gas VOCs technology of the present invention adopts a new online biodegradation technology and a new structural design, and has the following characteristics: high performance, extremely high degradation efficiency, easy operation, low risk, carbon emission reduction, controllable at normal temperature, cost reduction and efficiency improvement, and green environmental protection. Online continuous capture and degradation of painting waste gas can meet the requirements of continuous production of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the online waste gas biodegradation device of the present invention;

[0035] Figure 2 It is a schematic diagram of the internal structure and airflow direction of the biodegradation system reactor of the present invention;

[0036] Figure 3 It is a structural schematic diagram of the online waste gas biodegradation device (with a visualization window) of the present invention.

[0037] In the figure: 1, VOC pollution source 2, biodegradation pretreatment reactor 3, biodegradation system reactor 4, gas-water separator 5, induced draft fan 6, bird's mouth baffle 7, first spray head 8, second spray head 10, air inlet 11, waste gas inlet 12, waste gas outlet 13, air outlet channel 14, grid plate 15, spray water pump 16, air inlet channel 20, bacterial liquid chamber 21, air inlet 22, air outlet 23, air inlet pipe 25, transparent visual window 30, transparent visual window 31, first baffle 32, second baffle 33, third baffle 34, fourth baffle 35, fifth baffle 36, sixth baffle 37, seventh baffle 41, first filler 42, first spray head 43, second filler 44, second spray head 45, third filler 46, third spray head DETAILED DESCRIPTION

[0038] Now in conjunction with the accompanying drawings and specific embodiments, the present invention will be further described in detail. These accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the formation related to the present invention. These embodiments should be understood to be only used to illustrate the present invention without limiting the scope of protection of the present invention. After reading the content of the present invention, those skilled in the art can make various modifications to the present invention, and these equivalent changes and modifications also fall into the scope of protection limited by the present invention.

[0039] Example 1

[0040] like Figure 1-Figure 3 As shown, an online waste gas biodegradation device of the present invention comprises a VOC pollution source 1, a biodegradation pretreatment reactor 2, a biodegradation system reactor 3, a gas-water separator 4 and an induced draft fan 5 connected in sequence; the VOC pollution source 1 (such as a paint shop) is provided with an air inlet 10; the biodegradation pretreatment reactor 2 comprises a bacterial liquid chamber 20, and an air intake pipe 23 is provided at the lower front end of the bacterial liquid chamber 20; the air intake pipe 23 comprises a connected front vertical section and a rear horizontal section, and an air intake 21 is provided at the top of the vertical section; a first spray head 7 is provided at the middle of the horizontal section on the air intake pipe 23 near the air intake 21, and a protruding bird's mouth baffle 6 is provided at the rear end of the horizontal section on the air intake pipe 23 near the entrance of the bacterial liquid chamber 20; a second spray head 8 is provided at the middle top of the bacterial liquid chamber 20. The first spray head 7 and the second spray head 8 are connected to the bacterial liquid in the bacterial liquid chamber 20 through pipelines, respectively, and can spray the bacterial liquid (in another embodiment of the present application, the first spray head 7 and the second spray head 8 are equipped with a spray water pump to provide power for extracting and spraying the bacterial liquid). A transparent visual window 25 is provided at the upper part of the bacterial liquid chamber 20 to facilitate observation of the operation of the equipment (such as Figure 3 As shown), it is also possible to set a sensor to monitor the operating status of the device without setting the visualization window (as shown Figure 1 As shown). An air outlet 22 is provided at the upper rear end of the bacterial liquid chamber 20; a protruding bird's mouth baffle 6 and two spray heads (a first spray head 7 and a second spray head 8) are provided at the upper inner part of the biodegradation pretreatment reactor 2, which can make the gas-liquid mixing more complete and enhance the gas-liquid mixing effect. A certain amount (a certain liquid level height or volume) of liquid biological bacteria liquid is contained in the bacterial liquid chamber 20 of the biodegradation pretreatment reactor 2.

[0041] The biodegradation pretreatment reactor 2 of the present invention sets the angle, length and number of the bird's beak baffle 6 so that the cross-sectional area of ​​the air flow path entering the biodegradation pretreatment reactor 2 is smaller than the cross-sectional area of ​​the air inlet pipe 23, resulting in an accelerated flow rate of the gas-liquid mixture flowing through the bird's beak baffle 6; after the gas-liquid mixture enters the bacteria liquid chamber 20 of the biodegradation pretreatment reactor 2, the flow rate is instantly reduced and the volume is instantly expanded, producing an explosion effect, breaking up the bacteria liquid droplets into smaller pieces, so that the bacteria liquid droplets are more fully mixed with the gas.

[0042] The waste gas inlet 11 and the waste gas outlet 12 are arranged on both sides of the top of the biodegradation system reactor 3; a certain amount (certain liquid level height or volume) of liquid biological bacteria is installed at the bottom of the biodegradation system reactor 3. The first baffle 31, the second baffle 32, the third baffle 33, the fourth baffle 34, the fifth baffle 35, the sixth baffle 36 and the seventh baffle 37 are arranged in intervals in the biodegradation system reactor 3. The first baffle 31 has a sealed upper end and a channel at the lower end, the second baffle has a sealed upper end and a channel, the third baffle has a sealed upper end and a channel at the lower end, the fourth baffle has a sealed upper end and a channel, the fifth baffle has a sealed lower end and a channel, the sixth baffle has a sealed upper end and a channel, and the seventh baffle has a sealed lower end and a channel; between the first baffle 31 and the inner wall of the biodegradation system reactor 3 is an air inlet channel 16, and the top side of the air inlet channel 16 is connected to the waste gas inlet of the biodegradation system reactor 3. 11 connection; a first filler 41 and a first spray head 42 above the first baffle 31 and a second baffle 32 are provided between the first baffle 31 and the second baffle 32, a space is provided between the second baffle 32 and the third baffle 33, a second filler 43 and a second spray head 44 above the third baffle 33 and a fourth baffle 34, a space is provided between the fourth baffle 34 and the fifth baffle 35, a third filler 45 and a spray head 46 above the fifth baffle 35 and a space is provided between the fifth baffle 35 and the sixth baffle 36, a space is provided between the sixth baffle 36 and the seventh baffle 37, and an outlet channel 13 is provided between the seventh baffle 37 and the inner wall of the biodegradation system reactor 3, wherein a mesh plate 14 is provided, and the mesh plate 14 plays a filtering and blocking role. The top of the outlet channel 13 is connected to the waste gas outlet 12 of the biodegradation system reactor 3. The biodegradation system reactor 3 of the present invention is provided with a plurality of baffles arranged at intervals, the channels on the baffles are arranged in an upper and lower staggered manner, and multiple fillers and multiple sprays are provided, so that the waste gas is more fully degraded.

[0043] The biological bacteria liquid in the bacterial liquid chamber 20 of the biodegradation pretreatment reactor 2 is sprayed through the first spray head 7 and the second spray head 8, and mixed with the gas input from the air inlet pipe 23. The liquid level height of the biological bacteria liquid in the bacterial liquid chamber 20 is limited to the need to ensure continuous spraying, and the liquid level height range is usually set to not less than 70% of the maximum liquid level preset value. The liquid level height of the biological bacteria liquid at the bottom of the biodegradation system reactor 3 is limited to the need to ensure continuous spraying, and the liquid level height range is usually set to not less than 80% of the maximum liquid level preset value. If the liquid level is too low, the bacterial liquid needs to be supplemented. The bacterial liquid chamber 20 of the biodegradation pretreatment reactor 2 is connected to the bottom of the biodegradation system reactor 3 through a liquid level regulating device, and the liquid level regulating device can automatically adjust the liquid level height of the biological bacteria liquid in the bacterial liquid chamber 20 and the biodegradation system reactor 3 to meet the requirement that the liquid levels of the biodegradation pretreatment reactor 2 and the biodegradation system reactor 3 are not lower than the set range. The total amount of bacterial liquid required for different embodiments is calculated according to the type of waste gas to be treated, air volume, concentration, and operation time. The liquid level can be calculated by the spraying rate. This embodiment treats aqueous solvent waste gas, and the waste gas intake volume is 5000m 3 / H, VOC concentration is 300mg / m 3 About, opening time 20 hours, a total of 10m 3 About 100 ml of bacterial liquid.

[0044] In the biodegradation system reactor 3, transparent visualization windows 30 are provided at the upper and lower parts between adjacent baffles to facilitate observation of the equipment operation status (such as Figure 3 As shown), it is also possible to set a sensor to monitor the operating status of the device without setting the visualization window (as shown Figure 1 In the biodegradation system reactor 3, an aeration plate is provided below the filler between adjacent baffles, which is connected to the aeration pipe and the blower in turn to provide oxygen to the biological bacteria (the aeration plate, the aeration pipe and the blower are not shown in the figure); a spray water pump 15 (bacterial liquid circulation pump) is also provided below the filler between adjacent baffles, which is connected to the spray head above the filler through a spray water pipeline.

[0045] The filler in the biodegradation system reactor 3 adopts ceramic corrugated regular filler, and a very thin liquid film turbulence can be formed on the surface of the filler. An inclined tortuous channel for airflow is preset inside the filler, which can promote the airflow but not block the airflow. By setting the spray speed and the airflow velocity, the airflow flows through the inclined tortuous channel preset in the filler; the filler surface has good wetting properties. By selecting fillers with different specific surface areas, it is beneficial to the survival of microorganisms, and can accelerate the flow of liquid and minimize the amount of liquid stagnation in the filler, thereby reducing the chances of overheating, polymerization and coking.

[0046] Example 2

[0047] like Figure 1-Figure 3As shown, the present invention provides an online waste gas biodegradation method using the online waste gas biodegradation device of Example 1, comprising the following steps:

[0048] Waste gas utilization Figure 1 The power of the induced draft fan 5 on the far left generates VOC from the VOC pollution source 1 on the far right, and then the exhaust gas passes through the biodegradation pretreatment reactor 2 from right to left for gas-liquid mixing, passes through the biodegradation system reactor 3 for spray degradation treatment, and then passes through the gas-water separator 4 for gas-water separation, and is finally discharged from the induced draft fan 5.

[0049] Step 1: VOC pollution source 1

[0050] 1). There is an opening (air inlet 10) with a diameter of 30CM on the VOC pollution source 1, and air is drawn in from the environment by the induced draft fan 5.

[0051] 2). Add solvent to VOC pollution source 1, volatilize naturally, and mix with the air drawn in by induced draft fan 5 to simulate the exhaust gas generation at the spraying site.

[0052] Step 2: Biodegradation pretreatment reactor 2 (containing a certain amount of liquid biological bacteria liquid)

[0053] After the waste gas comes out from the VOC pollution source 1, it enters the biodegradation pretreatment reactor 2 and mixes with the biological bacteria liquid.

[0054] 1). After the waste gas enters the biodegradation pretreatment reactor 2 from the air inlet 21, it passes through the first spray 7 in the air inlet pipe 23 of the biodegradation pretreatment reactor 2 to make the gas and liquid contact and mix initially.

[0055] 2). After the gas and liquid initially contact and mix, they encounter the protruding bird-beak baffle 6, which produces an explosion mode, allowing the gas and liquid to be fully mixed.

[0056] 3). After the gas and liquid are fully mixed, they enter the bacterial liquid chamber 20 and undergo another spraying (the second spraying 8) to increase the gas-liquid mixing effect.

[0057] 4). The waste gas mixed with the bacterial liquid comes out from the gas outlet 22 of the biodegradation pretreatment reactor 2.

[0058] Step 3: Biodegradation system reactor 3 (containing a certain amount of liquid biological bacteria liquid)

[0059] After the waste gas mixed with the bacterial liquid comes out from the biodegradation pretreatment reactor 2, it enters the biodegradation system reactor 3 and is biodegraded (spraying degradation) by spraying the biological bacteria liquid.

[0060] 1). After the waste gas enters the biodegradation system reactor 3 through the waste gas inlet 11 and the air inlet channel 16 in sequence, it encounters the first baffle 31. Since the upper end of the first baffle 31 is sealed and there is a channel at the lower end, the gas passes from the lower end of the first baffle 31; then it encounters the second baffle 32. Since the lower end of the second baffle 32 is sealed and there is a channel at the upper end, the gas runs upward, passes through the first filler 41 and the spray of the first spray head to the upper end, and passes from the upper end of the second baffle 32; then it encounters the third baffle 33. Since the upper end of the third baffle 33 is sealed and there is a channel at the lower end, the gas runs downward and passes from the lower end of the third baffle 33; then it encounters the fourth baffle 34. Since the lower end of the fourth baffle 34 is sealed and there is a channel at the upper end, the gas runs upward, passes through the second filler 43 and the spray of the second spray head 44 to the upper end. , passing through the upper end of the fourth baffle 34; then it encounters the fifth baffle 35, because the upper end of the fifth baffle 35 is sealed and there is a channel at the lower end, the gas runs downward and passes through the lower end of the fifth baffle 35; then it encounters the sixth baffle 36, because the lower end of the sixth baffle 36 is sealed and there is a channel at the upper end, the gas runs upward, passes through the third filler 45 and the third spray head 46 to the upper end, and passes through the upper end of the sixth baffle 36; then it encounters the seventh baffle 37, because the upper end of the seventh baffle 37 is sealed and there is a channel at the lower end, the gas runs downward and passes through the lower end of the seventh baffle 37, then enters the gas outlet channel 13 and runs upward, and finally comes out from the exhaust gas outlet 12; this is repeated up and down, and after three fillers and spray degradation, the exhaust gas coming out of the exhaust gas outlet 12 has been basically fully degraded. (such as Figure 1-Figure 3 (shown)

[0061] 2). Spray water is biological bacteria liquid. A spray water pump (i.e., bacteria liquid circulation pump) and a spray water pipeline are provided in the biodegradation system reactor 3. The spray head is connected to the spray water pump through the spray water pipeline. The biological bacteria liquid used is LW biological bacteria and LR biological bacteria. The ratio of the two strains is set according to the number of bacterial colonies at 1:0.2-5, and the total bacterial colony contains more than 50 million bacteria per milliliter.

[0062] 3). Ceramic corrugated structured packing is used as the filler: Ceramic corrugated structured packing is a new type of structured packing, which is composed of many packing units with the same geometric shape. Due to the unique structure of ceramics, it has good hydrophilic properties. Its surface can form turbulent very thin liquid films and inclined tortuous channels for airflow, which can promote airflow but not block it, making ceramic fillers comparable to metal fillers, while its corrosion resistance and high temperature resistance are incomparable to metal fillers; its surface structure has good wetting properties, which can accelerate the flow of liquid and minimize the amount of liquid stagnation in the filler, thereby reducing the chances of overheating, polymerization and coking.

[0063] 4). After data detection, the VOC concentration of the exhaust gas inlet at the rear end of VOC pollution source 1 is 300mg / m 3The VOC concentration at the outlet of biodegradation system reactor 3 is basically 12-20 mg / m 3 The VOC degradation efficiency can reach about 93%.

[0064] Step 4: Gas-water separator 4

[0065] The main function of the gas-water separator 4 is to prevent the loss of water vapor and keep the outlet air within a certain humidity range.

[0066] Step 5: induced draft fan 5

[0067] Finally, the treated waste gas is discharged through the induced draft fan 5.

[0068] The operating experimental data of the online waste gas biodegradation device and the degradation method according to the embodiment of the present invention are shown in Table 1 below.

[0069] Table 1: Experimental data

[0070]

[0071]

[0072] The data in the above table show that the online waste gas biodegradation device and degradation method provided by the present invention solve the problem of online degradation of VOCs, and have the characteristics of high degradation efficiency, high safety, easy operation, low risk, carbon emission reduction, controllable at normal temperature, cost reduction and efficiency improvement, green and environmental protection, low operating cost, low maintenance cost, etc. It can continuously capture and degrade painting waste gas online, and can meet the requirements of continuous production of enterprises.

[0073] The above display only describes the main features and inventive points of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above-mentioned embodiments. Without departing from the present invention and the scope of protection, the present invention may have various changes, and these changes and improvements will fall within the scope of protection claimed by the present invention. The scope of protection claimed by the present invention is limited by the attached claims and their equivalents.

Claims

1. An online waste gas biodegradation device, characterized in that: It comprises a biodegradation pretreatment reactor, a biodegradation system reactor, a gas-water separator and an induced draft fan which are connected in sequence; a certain amount of liquid biological bacteria liquid is contained in the biodegradation pretreatment reactor and the biodegradation system reactor; waste gas inlet and waste gas outlet are arranged on both sides of the biodegradation pretreatment reactor and the biodegradation system reactor; a protruding bird-mouth baffle and two spray heads are arranged on the upper part of the biodegradation pretreatment reactor; a plurality of baffles are arranged in intervals in the biodegradation system reactor, and channels on the baffles are arranged in an upper and lower staggered manner; fillers are arranged between adjacent baffles, and spray heads are arranged above the fillers.

2. The on-line waste gas biodegradation device according to claim 1, characterized in that: The first baffle, the second baffle, the third baffle, the fourth baffle, the fifth baffle, the sixth baffle and the seventh baffle are arranged in intervals in the biodegradation system reactor. The first baffle has a sealed lower end with a channel, the second baffle has a sealed upper end with a channel, the third baffle has a sealed lower end with a channel, the fourth baffle has a sealed upper end with a channel, the fifth baffle has a sealed lower end with a channel, the sixth baffle has a sealed upper end with a channel, and the seventh baffle has a sealed lower end with a channel; a first filler and a spray head above the filler are provided between the first baffle and the second baffle, and a first filler and a spray head above the filler are provided between the second baffle and the third baffle. The space between the third baffle plate and the fourth baffle plate is empty, the space between the fourth baffle plate and the fifth baffle plate is empty, the space between the fifth baffle plate and the sixth baffle plate is empty, the space between the sixth baffle plate and the seventh baffle plate is empty; an air inlet channel is between the first baffle plate and the inner wall of the biodegradation system reactor, and the top side of the air inlet channel is connected to the waste gas inlet of the biodegradation system reactor; an air outlet channel is between the seventh baffle plate and the inner wall of the biodegradation system reactor, and the top of the air outlet channel is connected to the waste gas outlet of the biodegradation system reactor.

3. The on-line waste gas biodegradation device according to claim 2, characterized in that: The biodegradation pretreatment reactor comprises a bacterial liquid chamber, and an air inlet pipe is arranged at the lower part of the front end of the bacterial liquid chamber; the air inlet pipe comprises a connected front vertical section and a rear horizontal section, and an air inlet is arranged at the top of the vertical section; a first spray head is arranged at the middle part of the horizontal section on the air inlet pipe near the air inlet, and a protruding bird-beak baffle is arranged at the rear end of the horizontal section on the air inlet pipe near the entrance of the bacterial liquid chamber; a second spray head is arranged at the top of the bacterial liquid chamber; and an air outlet is arranged at the upper part of the rear end of the bacterial liquid chamber.

4. The on-line waste gas biodegradation device according to claim 3, characterized in that: In the biodegradation system reactor, a spray water pump is provided below the filler between adjacent baffles and is connected to a spray head above the filler through a spray water pipeline.

5. The on-line waste gas biodegradation device according to claim 4, characterized in that: In the biodegradation system reactor, an aeration disk is arranged below the filler between adjacent baffles and is connected to an aeration pipe and a blower in sequence.

6. The on-line waste gas biodegradation device according to claim 4, characterized in that: In the biodegradation system reactor, transparent visual windows are provided at the upper and lower parts between adjacent baffles; and a transparent visual window is provided at the upper part of the bacterial liquid chamber of the biodegradation pretreatment reactor.

7. The on-line waste gas biodegradation device according to claim 1, characterized in that: The filler in the biodegradation system reactor is a ceramic corrugated structured filler.

8. An online waste gas biodegradation method using the online waste gas biodegradation device as claimed in claim 4, characterized in that: The waste gas uses the power of the induced draft fan to first enter the biodegradation pretreatment reactor and mix with the biological bacteria liquid for gas-liquid mixing, then enter the biodegradation system reactor for biodegradation through the spraying of the biological bacteria liquid, then separate the water vapor through the gas-water separator, and finally discharge through the induced draft fan; specifically, the following steps are included: Step 1: The waste gas first enters the biodegradation pretreatment reactor and mixes with the biological bacteria liquid for gas-liquid mixing. In the air inlet pipe of the biodegradation pretreatment reactor, the first spray is used to make the gas and liquid contact and mix initially; after the gas and liquid are initially contacted and mixed, they encounter the protruding bird's beak baffle, which produces an explosion mode to make the gas and liquid fully mixed; after the gas and liquid are mixed, they enter the bacterial liquid chamber and pass through the second spray to increase the gas-liquid mixing effect; Step 2: After the waste gas is pretreated in the biodegradation pretreatment reactor, it enters the biodegradation system reactor and is biodegraded by spraying the biological bacteria liquid; after the waste gas enters the biodegradation system reactor from the waste gas inlet, it encounters the first baffle. Since the upper end of the first baffle is sealed and there is a channel at the lower end, the gas passes from the lower end of the first baffle and is sprayed to the upper end through the filler; then it encounters the second baffle. Since the lower end of the second baffle is sealed and there is a channel at the upper end, the gas runs upward, passes through the first filler and the spray of the first spray head to the upper end, and passes from the upper end of the second baffle; then it encounters the third baffle. Since the upper end of the third baffle is sealed and there is a channel at the lower end, the gas runs downward and passes from the lower end of the third baffle; then it encounters the fourth baffle. Since the lower end of the fourth baffle is sealed and there is a channel There is a channel at the upper end of the seal, and the gas runs upward, passes through the second filler and the spray of the second spray head to the upper end, and passes from the upper end of the fourth baffle; then it encounters the fifth baffle, because there is a channel at the lower end of the upper seal of the fifth baffle, the gas runs downward and passes from the lower end of the fifth baffle; then it encounters the sixth baffle, because there is a channel at the upper end of the lower seal of the sixth baffle, the gas runs upward, passes through the third filler and the spray of the third spray head to the upper end, and passes from the upper end of the sixth baffle; then it encounters the seventh baffle, because there is a channel at the lower end of the upper seal of the seventh baffle, the gas runs downward and passes from the lower end of the seventh baffle, then enters the gas outlet channel and runs upward, and finally comes out from the exhaust gas outlet; this is repeated up and down, passing through three fillers and spray degradation; Step 3: After the waste gas comes out of the biodegradation system reactor, it is separated from the water vapor by the gas-water separator and finally discharged through the induced draft fan.

9. The on-line waste gas biodegradation method according to claim 8, characterized in that: The filler in the biodegradation system reactor is a ceramic corrugated structured filler.

10. The on-line waste gas biodegradation method according to claim 9, characterized in that: The biological bacteria liquid used is LW biological bacteria and / or LR biological bacteria.

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