CN110496530A - A method and equipment for treating waste gas from low-temperature oil extraction - Google Patents

Abstract

The present invention relates to the technical field of oil extraction waste gas treatment, in particular to a method and equipment for treating low-temperature oil extraction waste gas. The equipment includes a high-voltage electrostatic degreaser, a catalytic absorption system and a biodegradation system connected in sequence; the catalytic absorption system includes A catalytic packed tower and a catalytic packed bed accommodated in the middle of the catalytic packed tower; the biodegradation system includes a biological filter tower, a biological packed bed accommodated in the middle of the biological filtered tower, and a biological packed bed arranged above the biological packed bed The spray device, the gas outlet of the high-voltage electrostatic degreaser is connected with the gas inlet of the catalytic packed tower, the gas outlet of the catalytic packed tower is connected with the gas inlet of the biological filter tower, and the device It also includes a first circulation pump communicated with the spraying device, and the liquid outlet of the biological filter tower is communicated with the liquid inlet of the first circulation pump. The equipment adopts the scheme of "electrostatic degreasing-catalytic absorption-biodegradation", which ensures the adaptability and reliability of the treatment system.

Description

A method and equipment for treating waste gas from low-temperature oil extraction

technical field

The invention relates to the technical field of waste gas from oil pressing, in particular to a method and equipment for treating waste gas from low-temperature oil pressing.

Background technique

Edible oil needs to go through a low-temperature pressing process during the production process. During the low-temperature pressing process of oil, a large amount of waste gas will be generated, that is, oil-pressing waste gas. The main pollutants of oil-pressing waste gas are particulate matter (oil droplets) and VOCs with complex components. These oil-pressing waste gases Exhaust gas is a malodorous gas, and the concentration of the odor can reach several thousand or even tens of thousands, which is very harmful to the human body. The characteristics of high concentration, strong odor and complex components of oil extraction waste gas have always been difficult to treat.

Common waste gas treatment methods include adsorption, absorption, condensation, low-temperature plasma, UV photolysis, combustion, photocatalysis, and biological methods. Among them, the adsorbent of the adsorption method is easy to be saturated, the regeneration is difficult, the requirements for pretreatment are high, and the operating cost is high; low-temperature plasma and UV photolysis are mainly aimed at low-concentration odor occasions, and the removal efficiency of high-concentration exhaust gas is low; the combustion method is for high-concentration waste gas. Concentration and combustible exhaust gas purification effect is better, but there are disadvantages of high investment costs and high operating costs; photocatalysis and absorption methods have low purification efficiency and are prone to secondary pollution; while biological methods have low operating costs and no secondary pollution With the advantages of easy management and other advantages, it has become a hot spot in the frontier research and application of industrial waste gas purification in the world. It has been more and more widely researched and applied at home and abroad. It has deodorization and organic waste gas purification engineering practice in Germany, the Netherlands, the United States and Japan. , but the biological method is not ideal for the purification effect of exhaust gas with too high concentration.

In view of the complexity and difficulty of treatment of oil extraction waste gas, there is still no effective treatment technology to meet its purification needs.

Contents of the invention

In order to overcome the shortcomings and deficiencies in the prior art, the object of the present invention is to provide a device for treating low-temperature oil-pressing waste gas, which adopts the method of "electrostatic oil removal-catalytic absorption-biodegradation" in the treatment of low-temperature oil-pressing waste gas The plan uses a combination of physical, chemical and biological means to reduce the particulate matter and VOCs in the exhaust gas of oil extraction layer by layer, and finally get purified emissions, which ensures the adaptability and reliability of the treatment system.

Another object of the present invention is to provide a method for treating waste gas from low-temperature oil extraction. The method is simple to operate, easy to control, easy to maintain, and high in purification efficiency, and solves the problems of high operating costs, incomplete treatment of traditional absorption methods, and high-efficiency biological methods. The disadvantage of low removal efficiency of concentrated waste gas can maximize the treatment efficiency of waste gas, and is suitable for the treatment of low-temperature oil extraction waste gas in food factories.

The purpose of the present invention is achieved through the following technical solutions: a device for treating low-temperature oil extraction waste gas, including a high-voltage electrostatic degreaser, a catalytic absorption system and a biodegradation system connected in sequence; the catalytic absorption system includes a catalytic packed tower and a container The catalytic packing bed in the middle of the catalytic packing tower; the biodegradation system includes a biological filter tower, a biological packing bed in the middle of the biological filtering tower and a spray device arranged on the top of the biological packing bed, The gas outlet of the high-voltage electrostatic degreaser communicates with the gas inlet of the catalytic packed tower, the gas outlet of the catalytic packed tower communicates with the gas inlet of the biological filter tower, and the device also includes a The spraying device is connected with the first circulation pump, and the liquid outlet of the biological filter tower is connected with the liquid inlet of the first circulation pump.

Preferably, the catalytic absorption system also includes a sprayer arranged above the bed of catalytic packing and a second circulation pump communicated with the sprayer, the liquid outlet of the catalytic packing tower is connected to the inlet of the second circulation pump. The liquid port is connected; the equipment also includes an oxidant solution storage tank and a metering pump connected with the oxidant solution storage tank, and the metering pump is used to transport the oxidant solution into the catalytic packed tower.

Preferably, the bio-filler bed includes a bio-trickling filter bed and a bio-filtration bed arranged above the bio-trickling filter bed, the bio-trickling filter bed and the bio-filter bed are arranged at intervals, and the spraying The device includes a control valve, a first spray head arranged above the biological filter bed, and a second spray head arranged between the biological trickling filter bed and the biological filter bed, the first spray head and the second spray head Both communicate with the first circulating pump, and the control valve is used to control the opening and closing of the first spray head.

Preferably, the biodegradation system further includes a replenishment tank communicated with the biofilter tower; an exhaust port is provided at the top of the biofilter tower.

Preferably, the high-voltage electrostatic degreaser includes a degreaser box, a high-voltage static electricity generating device accommodated in the degreaser box, and a conductive collecting plate electrically connected to the high-voltage static electricity generating device, and the degreaser box The body is provided with an exhaust gas inlet and an exhaust gas outlet, and the conductive collecting plate is arranged between the exhaust gas inlet and the exhaust gas outlet.

Preferably, the high-voltage electrostatic degreaser also includes a centrifugal driver accommodated in the degreaser box, and the centrifugal driver is used to drive the conductive collecting plate to rotate in the degreaser box; the degreaser box The body is provided with an oil discharge through hole, and the bottom of the degreaser box is provided with an oil collection tank, and the degreaser box communicates with the oil collection tank through the oil discharge through hole.

Preferably, the inner wall of the exhaust gas inlet and the inner wall of the exhaust gas outlet are both clamped with grilles.

Preferably, the device further includes a mechanical centrifugal oil removal device, the gas outlet of the mechanical centrifugal oil removal device communicates with the waste gas inlet.

Another object of the present invention is achieved by the following technical solution: a method for treating low-temperature oil-pressing waste gas, which uses the above-mentioned equipment to treat low-temperature oil-pressing waste gas.

The processing method includes the following steps:

(S1), activating the biodegradation system: add microorganisms, nutrient solution and water to the biofiltration tower to form a microbial absorption liquid, then start the first circulation pump to make the microbial absorption liquid in the first circulation pump, spray device and biofiltration tower Internal circulation until the microorganisms complete film formation in the biological filler bed;

(S2) The exhaust gas from oil extraction is degreased sequentially by the high-voltage electrostatic degreaser, the catalytic oxidation by the catalytic absorption system, and the microbial degradation by the biodegradation system, that is, the treatment of the exhaust gas from oil extraction at low temperature is completed.

Further, in step (S1), the microorganisms complete film formation on the biological filler bed, that is, the microorganisms complete film formation on both the biotrickling filter bed and the biofiltration bed. In step (S2), the treatment method of electrostatic degreasing includes the following steps: passing oil extraction exhaust gas into a high-voltage electrostatic degreaser, and generating a high-voltage electrostatic field inside the degreaser box under the action of a high-voltage static electricity generating device , after the exhaust gas from oil extraction enters the degreaser box, under the action of electrostatic force, oil droplets and other particles are adsorbed to the surrounding collecting plate, and ozone is generated at the same time and mixed into the exhaust gas from oil extraction; the treatment method of catalytic oxidation includes the following steps: high voltage electrostatic The oil extraction exhaust gas discharged from the deoiler enters the catalytic packing tower. During the process of the oil extraction exhaust gas passing through the catalytic packing bed, the catalytic packing bed intercepts the particulate matter in the oil extraction exhaust gas, and at the same time uses ozone to catalyze and oxidize the VOCs in the oil extraction exhaust gas The treatment method of microbial degradation includes the following steps: the oil extraction exhaust gas discharged from the catalytic packing tower enters the biological filter tower, and the oil extraction exhaust gas is degraded by microorganisms in the process of passing through the biological packing bed, that is, the treatment of low temperature oil extraction exhaust gas is completed.

Further, the processing method of electrostatic degreasing also includes the following steps: the centrifugal driver drives the conductive collecting plate to rotate in the degreaser box, so that the particles on the conductive collecting plate are separated from the conductive collecting plate under the action of centrifugal force. The collecting plate achieves the effect of automatically cleaning the conductive collecting plate and maintains the role of the conductive collecting plate in absorbing particulate matter in the exhaust gas of oil extraction. The catalytic oxidation treatment method also includes the following steps: the metering pump quantitatively transports the oxidant solution in the oxidant solution storage tank to the catalytic packed tower, sprays the oxidant solution to the catalytic packed bed by means of the second circulating pump and a sprayer, The oxidant solution and the ozone produced by the high-voltage electrostatic degreaser act synergistically and catalyze and oxidize the exhaust gas from oil extraction under the action of the catalyst, thereby improving the efficiency of removing the exhaust gas from oil extraction. The treatment method of microbial degradation also includes the following steps: adding the microbial absorption liquid composed of microorganisms, nutrient solution and water into the replenishment tank and then entering the biological filter tower, and feeding the biological trickling filter bed with the help of the first circulation pump and the second nozzle. Continuous spraying of microorganisms, nutrient solution and water, using the control valve to control the opening and closing of the first nozzle, the first nozzle sprays the biological filter bed intermittently or without spraying microorganisms, nutrient solution and water, biological dripping The bed first treats and dilutes the gas with a higher concentration, and then treats the oil extraction waste gas through the biological filter bed to improve the purification efficiency of the oil extraction waste gas.

Preferably, the superficial gas velocity of the high-voltage electrostatic degreaser is 2-5m/s; the superficial velocity of the catalytic packed tower is 0.5-2m/s, and the residence time in contact with the catalytic packed bed is 1-4s , the spraying total liquid-gas ratio of the sprayer is 2-4:1; the superficial flow velocity of the biological filter tower is 0.1-1m/s, and the residence time in contact with the biological trickling filter bed is 6-60s; the second nozzle The spray liquid-gas ratio of the spray is 0.2-1.5:1, the residence time in contact with the biological filter bed is 3-30s, and the spray liquid-gas ratio of the first nozzle is 0.1-0.5:1; when the first nozzle performs intermittent spraying , the intermittent spraying time is 10-15min/h.

The method for treating low-temperature oil extraction waste gas of the present invention can remove more than 90% of particulate matter such as oil droplets, and remove 80%-90% of VOCs.

The beneficial effect of the present invention lies in: the equipment for treating low-temperature oil-pressing waste gas of the present invention adopts the scheme of "electrostatic oil removal-catalytic absorption-biological degradation" in the treatment of low-temperature oil-pressing waste gas, through the combination of physics, chemistry and biology The means to reduce the particulate matter and VOCs in the exhaust gas of oil extraction layer by layer, and finally get the purified emission, which ensures the adaptability and reliability of the treatment system.

The equipment uses the high-voltage static electricity of the high-voltage electrostatic degreaser to capture the particles such as oil droplets, so that the particles can be separated from the exhaust gas of oil extraction, reduce the concentration of particles in the exhaust gas of oil extraction, and reduce the load of the catalytic absorption system, thus It is conducive to the catalytic absorption system to more efficiently remove VOCs in the exhaust gas of oil extraction. At the same time, the high-voltage electrostatic degreaser generates ozone under the action of high-voltage static electricity, which is mixed into the exhaust gas of oil extraction and enters the catalytic packing tower; it is used as particulate matter in the catalytic packing bed Under the condition of further intercepting particulate matter and catalyzing ozonation to oxidize the VOCs in the exhaust gas of oil extraction, the concentration of particulate matter in the exhaust gas of oil extraction is further reduced, the concentration of VOCs in the exhaust gas of oil extraction is lower, and the load of the biodegradation system is reduced; through the catalytic absorption system The treated oil extraction exhaust gas enters the biological filter tower, and under the action of the biological filler bed, the VOCs in the oil extraction exhaust gas are degraded. Under the action of the first circulation pump and the spray device, microorganisms, The nutrient solution and water make the bio-filler bed continue to function and improve the efficiency of degrading VOCs.

This equipment solves the shortcomings of traditional absorption method, such as high operating cost, incomplete treatment and low efficiency of biological method for removing high-concentration waste gas. It has higher stability and is more resistant to impact load, ensuring the treatment of oil-pressing waste gas. efficiency.

The method for treating waste gas from low-temperature oil extraction of the present invention is simple to operate, easy to control, easy to maintain, and high in purification efficiency, and solves the problems of high operating costs, incomplete treatment and low removal efficiency of high-concentration waste gas in the traditional absorption method. The disadvantage is that it can maximize the treatment efficiency of waste gas, and is suitable for the treatment of low-temperature oil extraction waste gas in food factories.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is an exploded schematic view of the high-voltage electrostatic degreaser of the present invention.

Reference signs are: 01, high-voltage electrostatic degreaser; 011, degreaser box; 012, high-voltage electrostatic generating device; 013, conductive collecting plate; 014, centrifugal drive; 02, catalytic packed tower; 03, catalytic packed bed layer; 04, biological filter tower; 05, biological packing bed; 051, biological trickling filter bed; 052, biological filter bed; 06, spraying device; 061, control valve; 062, the first nozzle; 063, the first 2 nozzles; 07, the first circulation pump; 08, sprayer; 09, the second circulation pump; 10, oxidant solution storage tank; 11, metering pump; 12, replenishment tank; 13, exhaust port; ; 15. Exhaust gas outlet; 16. Oil collecting tank; 17. Grille; 18. Mechanical centrifugal degreasing device.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the implementation modes are not intended to limit the present invention.

Example 1

As shown in Figure 1-2, a device for treating low-temperature oil extraction waste gas includes a high-voltage electrostatic degreaser 01 connected in sequence, a catalytic absorption system and a biodegradation system; the catalytic absorption system includes a catalytic packed tower 02 and a capacity device The catalytic packing bed 03 in the middle part of the catalytic packing tower 02; the biodegradation system includes a biological filter tower 04, a biological packing bed 05 accommodated in the middle part of the biological filtering tower 04 and the top of the biological packing bed 05 The spray device 06, the gas outlet of the high-voltage electrostatic degreaser 01 is communicated with the gas inlet of the catalytic packed tower 02, and the gas outlet of the catalytic packed tower 02 is connected with the gas inlet of the biological filter tower 04 The device also includes a first circulating pump 07 communicating with the spray device 06 , and the liquid outlet of the biological filter tower 04 is in communication with the liquid inlet of the first circulating pump 07 . The bottom of the biological filter tower 04 is provided with a first liquid storage chamber, the liquid inlet of the first circulation pump 07 communicates with the first liquid storage chamber, and the liquid outlet of the first circulation pump 07 communicates with the spray nozzle. The shower device 06 is connected.

The equipment utilizes the high-voltage static electricity of the high-voltage electrostatic degreaser 01 to capture particles such as oil droplets, so that the particles are separated from the exhaust gas of oil extraction, reducing the concentration of particles in the exhaust gas of oil extraction, and reducing the load of the catalytic absorption system. This is beneficial to the catalytic absorption system to more efficiently remove VOCs in the exhaust gas of oil extraction. At the same time, the high-voltage electrostatic deoiler 01 generates ozone under the action of high-voltage static electricity, which is mixed into the exhaust gas of oil extraction and enters the catalytic packing tower 02; in the catalytic packing bed 03 When used as particulate matter, it further intercepts particulate matter and catalyzes ozonation to oxidize VOCs in oil extraction exhaust gas, further reducing the concentration of particulate matter in oil extraction exhaust gas, lowering the concentration of VOCs in oil extraction exhaust gas, and reducing the load on the biodegradation system; The exhaust gas from oil extraction after being treated by the catalytic absorption system enters the biological filter tower 04, and under the action of the biological filler bed 05, the VOCs in the exhaust gas from oil extraction are degraded. Microorganisms, nutrient solution and water are added to the packing bed 05, so that the biological packing bed 05 can continue to function and improve the efficiency of degrading VOCs. Further, the raw material used in the catalytic packing bed 03 is granular inorganic catalytic packing, and the granular inorganic catalytic packing is a carrier loaded with catalyst, and the carrier includes but not limited to at least one of activated carbon, volcanic rock and zeolite One, the catalyst is an active component such as manganese element and cobalt element, preferably, the carrier is activated carbon, and the catalyst is an active component of manganese element; the biological filler bed 05 needs to be supplied to biological Add microorganisms, nutrient solution and water in the filter tower 04 and spray microorganisms, nutrient solution and water to the biological packing bed 05 by means of the first circulation pump 07 and spraying device 06, and wait for the microorganisms to form a film on the biological packing bed 05 After completion, it can be used to degrade waste gas from oil extraction; the microorganisms are commercially available bacilli capable of decomposing VOCs and/or fungi capable of decomposing VOCs. The air inlet of described catalytic packed tower 02 is arranged on the bottom of catalytic packed tower 02, and the gas outlet of described catalytic packed tower 02 is arranged on the top of catalytic packed tower 02, and the air inlet of described biological filter tower 04 is arranged on biological The bottom of the filter tower 04, the gas outlet of the biological filter tower 04 is arranged on the top of the biological filter tower 04.

This equipment solves the shortcomings of traditional absorption method, such as high operating cost, incomplete treatment and low efficiency of biological method for removing high-concentration waste gas. It has higher stability and is more resistant to impact load, ensuring the treatment of oil-pressing waste gas. efficiency.

In this embodiment, the catalytic absorption system also includes a shower 08 arranged above the catalytic packed bed 03 and a second circulation pump 09 communicated with the shower 08, the outlet liquid of the catalytic packed tower 02 The port is communicated with the liquid inlet of the second circulating pump 09; the device also includes an oxidant solution storage tank 10 and a metering pump 11 communicated with the oxidant solution storage tank 10, and the metering pump 11 is used to transport the oxidant solution into the The catalytic packed tower 02. The bottom of the catalytic packed tower 02 is provided with a second liquid storage chamber, the liquid inlet of the second circulation pump 09 communicates with the second liquid storage chamber, and the liquid outlet of the second circulation pump 09 communicates with the spray nozzle. Shower 08 communicates.

Adopt above-mentioned technical scheme, metering pump 11 quantitatively transports the oxidizing agent solution in the oxidizing agent solution storage tank 10 to the second liquid storage room of described catalytic packing tower 02, by means of the second circulation pump 09 and sprayer 08 to catalytic packing bed layer 03 Spray the oxidant solution, the oxidant solution and the ozone generated by the high-voltage electrostatic degreaser 01 act synergistically and catalyze the oxidation of oil extraction exhaust gas under the action of the catalyst, which improves the efficiency of removing oil extraction exhaust gas. Further, the number of the catalytic packed bed 03 is 1-4 layers. When the number of the catalytic packed bed 03 exceeds one layer, two adjacent catalytic packed beds 03 are arranged at intervals, and the sprayer The number of 08 is the same as that of the catalytic packing bed 03, and a shower 08 is arranged above each catalytic packing bed 03 to improve the purification efficiency. Preferably, the number of the catalytic packing bed 03 is 2 layers, and the oxidant solution is hydrogen peroxide; in other embodiments, the oxidant solution is sodium hypophosphite solution or other oxidant solutions. Dissolved catalysts such as iron salts can be added into the catalytic packed tower 02 to improve the catalytic oxidation effect of the catalytic absorption system.

In this embodiment, the biological filler bed 05 includes a biological trickling filter bed 051 and a biological filter bed 052 arranged above the biological trickling filter bed 051, and the biological trickling filter bed 051 and the biological filter bed The layers 052 are arranged at intervals, and the spraying device 06 includes a control valve 061, a first spray head 062 arranged above the biological filter bed 052, and a first spray nozzle 062 arranged between the biological trickling filter bed 051 and the biological filter bed 052. Between the second spray head 063, the first spray head 062 and the second spray head 063 are both in communication with the first circulation pump 07, and the control valve 061 is used to control the opening and closing of the first spray head 062.

Using the above-mentioned technical scheme, with the combination of bio-trickling filter bed 051 and bio-filter bed 052, the bio-trickling filter bed 051 first dilutes the gas with a higher concentration, and then further treats the waste gas from oil extraction through the biological filter bed 052 , Improve the purification efficiency of oil extraction waste gas. After the microorganisms have finished filming on both the bio-trickling filter bed 051 and the bio-filter bed 052, continuously spray microorganisms, nutrient solution and water to the bio-trickling filter bed 051 by means of the first circulation pump 07 and the second spray nozzle 063 In order to form a biological trickling filter unit, it is more conducive to the reproduction of bacilli and improve the removal rate of odor, and the spraying effect can humidify the exhaust gas from oil extraction, which is more conducive to the treatment of exhaust gas from oil extraction by the biological filter bed 052; it is controlled by the control valve 061 The opening and closing of the first nozzle 062, the first nozzle 062 sprays the biological filter bed 052 intermittently or does not need to spray microorganisms, nutrient solution and water to form a biological filter unit, which is more conducive to the propagation of fungi. Further, the raw materials used in the biological trickling filter bed 051 include but not limited to at least one of pumice, volcanic rock balls and ceramics, and the raw materials used in the biological filter bed 052 include but not limited to pumice, ceramsite, tree At least one of bark, wood block and sawdust; preferably, the raw material used in the biological trickling filter bed 051 is pumice, and the raw material used in the biological filter bed 052 is ceramsite.

In this embodiment, the biodegradation system also includes a replenishment tank 12 communicated with the biological filter tower 04; the top of the biological filter tower 04 is provided with an exhaust port 13; the exhaust port 13 is connected to the The gas outlet of the biological filter tower 04 is connected.

Using the above technical scheme, when in use, add microorganisms, nutrient solution and water into the liquid replenishment tank 12, and then enter the biofiltration tower 04, which is convenient for supplementing microorganisms, nutrient solution and water for the biological packing bed 05, ensuring the biodegradation system. Purification efficiency: the oil extraction waste gas purified by the biological filler bed 05 is discharged from the exhaust port 13 to the external environment.

In this embodiment, the high-voltage electrostatic degreaser 01 includes a degreaser box 011, a high-voltage static electricity generating device 012 accommodated in the degreaser box 011, and a conductive A collecting plate 013 , the degreaser box 011 is provided with an exhaust gas inlet 14 and an exhaust gas outlet 15 , and the conductive collecting plate 013 is arranged between the exhaust gas inlet 14 and the exhaust gas outlet 15 .

With the above technical solution, under the action of the high-voltage static electricity generating device 012, a high-voltage electrostatic field is generated inside the degreaser box 011, and the exhaust gas from oil extraction enters the deoiler box 011, and particles such as oil droplets are under the action of electrostatic force Adsorbed to the surrounding collecting plate, so that the oil droplets and other particles are separated from the exhaust gas of the oil press, so as to achieve the effect of oil removal. Further, the high-voltage static electricity generating device 012 is an existing technology, which is only used here as an application.

In this embodiment, the high-voltage electrostatic degreaser 01 further includes a centrifugal driver 014 accommodated in the degreaser box 011, and the centrifugal driver 014 is used to drive the conductive collecting plate 013 in the degreaser box. Rotate inside the body 011; the degreaser case 011 is provided with an oil discharge through hole (not shown in the figure), the bottom of the degreaser case 011 is provided with an oil collection tank 16, and the degreaser case 011 011 communicates with the oil sump 16 through the oil discharge through hole.

Using the above technical solution, the centrifugal driver 014 drives the conductive collecting plate 013 to rotate in the degreaser box 011, so that the particles on the conductive collecting plate 013 are separated from the conductive collecting plate 013 under the action of centrifugal force, The effect of automatically cleaning the conductive collecting plate 013 is achieved, and the function of the conductive collecting plate 013 to absorb particulate matter in the exhaust gas of oil extraction is maintained. Further, the number of high-voltage electrostatic deoilers 01 is 1-5, and multiple high-voltage electrostatic deoilers 01 are combined together to remove oil and generate more ozone to remove VOCs in oil extraction waste gas. In this embodiment, the number of the high-voltage electrostatic degreaser 01 is one.

In this embodiment, the inner wall of the exhaust gas inlet 14 and the inner wall of the exhaust gas outlet 15 are both clamped with a grille 17 .

Adopting the above-mentioned technical scheme, it plays the role of intercepting particulate matter, reduces the concentration of particulate matter in the oil extraction waste gas entering the high-voltage electrostatic degreaser 01, and also prevents the particulate matter from detaching from the conductive collector plate 013 during the rotation process. The collecting plate 013 splashes and is discharged into the catalytic absorption system through the exhaust gas outlet 15, further reducing the processing load of the catalytic absorption system.

In this embodiment, the device further includes a mechanical centrifugal degreasing device 18 , and the gas outlet of the mechanical centrifugal degreasing device 18 communicates with the waste gas inlet 14 .

Using the above technical solution, the mechanical centrifugal oil removal device 18 is used to pretreat the exhaust gas from oil extraction to reduce the concentration of particulate matter in the exhaust gas from oil extraction, thereby reducing the workload of the high-voltage electrostatic oil remover 01 and ensuring the high-voltage electrostatic generator 012. working normally. Further, the mechanical centrifugal degreasing device 18 is a prior art, which is only used here as an application.

The device for treating waste gas from oil pressing of the present invention is suitable for treating waste gas from oil pressing, especially suitable for treating high-concentration waste gas from oil pressing with an odor concentration of 2000-50000.

Example 2

A method for treating low-temperature oil-pressing waste gas, which uses the equipment in Example 1 to treat low-temperature oil-pressing waste gas.

The processing method includes the following steps:

(S1), activating the biodegradation system: add microorganisms, nutrient solution and water to the biofiltration tower to form a microbial absorption liquid, then start the first circulation pump to make the microbial absorption liquid in the first circulation pump, spray device and biofiltration tower Internal circulation until the microorganisms complete film formation in the biological filler bed;

(S2) The exhaust gas from oil extraction is degreased sequentially by the high-voltage electrostatic degreaser, the catalytic oxidation by the catalytic absorption system, and the microbial degradation by the biodegradation system, that is, the treatment of the exhaust gas from oil extraction at low temperature is completed.

Wherein, in the step (S1), the microorganisms complete film formation on the biological filler bed, that is, the microorganisms complete film formation on both the biological trickling filter bed and the biological filter bed. In step (S2), the treatment method of electrostatic degreasing includes the following steps: passing oil extraction exhaust gas into a high-voltage electrostatic degreaser, and generating a high-voltage electrostatic field inside the degreaser box under the action of a high-voltage static electricity generating device , after the exhaust gas from oil extraction enters the degreaser box, under the action of electrostatic force, oil droplets and other particles are adsorbed to the surrounding collecting plate, and ozone is generated at the same time and mixed into the exhaust gas from oil extraction; the treatment method of catalytic oxidation includes the following steps: high voltage electrostatic The oil extraction exhaust gas discharged from the deoiler enters the catalytic packing tower. During the process of the oil extraction exhaust gas passing through the catalytic packing bed, the catalytic packing bed intercepts the particulate matter in the oil extraction exhaust gas, and at the same time uses ozone to catalyze and oxidize the VOCs in the oil extraction exhaust gas The treatment method of microbial degradation includes the following steps: the oil extraction exhaust gas discharged from the catalytic packing tower enters the biological filter tower, and the oil extraction exhaust gas is degraded by microorganisms in the process of passing through the biological packing bed, that is, the treatment of low temperature oil extraction exhaust gas is completed.

Example 3

The difference between this embodiment and embodiment 2 is:

The treatment method of electrostatic degreasing also includes the following steps: the centrifugal driver drives the conductive collecting plate to rotate in the degreaser box, so that the particles on the conductive collecting plate are separated from the conductive collecting plate under the action of centrifugal force.

The catalytic oxidation treatment method also includes the following steps: the metering pump quantitatively transports the oxidant solution in the oxidant solution storage tank to the catalytic packed tower, sprays the oxidant solution to the catalytic packed bed by means of the second circulating pump and a sprayer, The oxidant solution and the ozone produced by the high-voltage electrostatic degreaser act synergistically and catalyze the oxidation of the waste gas from oil extraction under the action of the catalyst.

The treatment method of microbial degradation also includes the following steps: adding the microbial absorption liquid composed of microorganisms, nutrient solution and water into the replenishment tank and then entering the biological filter tower, and feeding the biological trickling filter bed with the help of the first circulation pump and the second nozzle. Continuous spraying of microorganisms, nutrient solution and water, using the control valve to control the opening and closing of the first nozzle, the first nozzle sprays the biological filter bed intermittently or without spraying microorganisms, nutrient solution and water, biological dripping The bed layer first processes and dilutes the gas with a higher concentration, and then further treats the waste gas from oil extraction through the biological filter bed layer.

The superficial gas velocity of the high-voltage electrostatic degreaser is 2 to 5m/s; the superficial velocity of the catalytic packed tower is 0.5 to 2m/s, and the residence time in contact with the catalytic packed bed is 1 to 4s. The total liquid-gas ratio of the spraying device is 2-4:1; the superficial flow velocity of the biological filter tower is 0.1-1m/s, the residence time in contact with the biological trickling filter bed is 6-60s, and the spraying of the second nozzle The liquid-gas ratio is 0.2-1.5:1, the residence time in contact with the biological filter bed is 3-30s, the spraying liquid-gas ratio of the first nozzle is 0.1-0.5:1; when the first nozzle sprays intermittently, intermittent The spraying time is 10-15min/h.

Preferably, in this embodiment, the superficial gas velocity of the high-voltage electrostatic degreaser is 4m/s; the superficial velocity of the catalytic packed tower is 1m/s, and the residence time in contact with the catalytic packed bed is 2s , the spraying total liquid-gas ratio of the sprayer is 3:1; the superficial flow velocity of the biological filter tower is 0.5m/s, the residence time in contact with the biological trickling filter bed is 30s, and the spraying liquid gas of the second sprayer The ratio is 1:1, the residence time in contact with the biological filter bed is 15s, and the spray liquid-gas ratio of the first nozzle is 0.3:1; when the first nozzle performs intermittent spraying, the intermittent spraying time is 12min/h .

Example 4

The difference between this embodiment and embodiment 3 is:

In this embodiment, the superficial gas velocity of the high-voltage electrostatic degreaser is 2m/s; the superficial velocity of the catalytic packed tower is 0.5m/s, and the residence time in contact with the catalytic packed bed is 1s. The total spraying liquid-gas ratio of the shower is 2:1; the superficial flow velocity of the biological filter tower is 0.1m/s, the residence time in contact with the biological trickling filter bed is 6s, and the spraying liquid-gas ratio of the second nozzle is 0.2:1, the residence time in contact with the biological filter bed is 3s, the spray liquid-gas ratio of the first nozzle is 0.1:1; when the first nozzle performs intermittent spraying, the intermittent spraying time is 10min/h.

Example 5

In this embodiment, the superficial gas velocity of the high-voltage electrostatic degreaser is 5m/s; the superficial velocity of the catalytic packed tower is 2m/s, and the residence time in contact with the catalytic packed bed is 4s. The total liquid-gas ratio of the spraying device is 4:1; the superficial flow velocity of the biological filter tower is 1m/s, the residence time in contact with the biological trickling filter bed is 60s, and the spraying liquid-gas ratio of the second nozzle is 1.5: 1. The residence time in contact with the biological filter bed is 30s, and the spray liquid-gas ratio of the first nozzle is 0.5:1; when the first nozzle performs intermittent spraying, the intermittent spraying time is 15min/h.

Example 6

A method for processing low-temperature oil-pressing waste gas, the method adopts the equipment of Example 1 to process the low-temperature pressing sesame oil waste gas with an odor concentration of 5000.

Configure 4 high-voltage electrostatic degreasers to be used in parallel, the designed total air volume is 25000m ³ /h, the operating power of the high-voltage electrostatic generating device is 6.4KW, the operating power of the centrifugal drive is 4.4KW, the total empty tower air of the high-voltage electrostatic degreasing The velocity is 4m/s; in the catalytic absorption system, the superficial velocity of the catalytic packed tower is 1.68m/s, the residence time is 2.5s, and the spray liquid-gas ratio is 2.5:1; in the biodegradation system , the superficial velocity of the biological trickling filter bed is 0.2m/s, the residence time is 7.6s, the spray liquid-gas ratio is 1:1, the superficial velocity of the biological filter bed is 0.34m/s, and the residence time is 4.4 s, the spray liquid-gas ratio is 0.3:1, and the intermittent spray time is 12min/h.

The above-mentioned embodiments are preferred implementation solutions of the present invention. In addition, the present invention can also be realized in other ways, and any obvious replacements are within the protection scope of the present invention without departing from the concept of the present invention.

Claims (10)

1. A device for processing low-temperature oil extraction waste gas, characterized in that: it includes a high-voltage electrostatic degreaser, a catalytic absorption system and a biodegradation system connected in sequence; the catalytic absorption system includes a catalytic packing tower and a catalytic packing tower The catalytic packing bed in the middle; the biodegradation system includes a biological filter tower, a biological packing bed arranged in the middle of the biological filtering tower, and a spraying device arranged above the biological packing bed, and the high-voltage electrostatic precipitator The gas outlet of the oiler is communicated with the air inlet of the catalytic packed tower, the gas outlet of the catalytic packed tower is communicated with the air inlet of the biological filter tower, and the equipment also includes a The first circulating pump, the liquid outlet of the biological filter tower communicates with the liquid inlet of the first circulating pump. 2. The equipment for treating waste gas from low-temperature oil extraction according to claim 1, characterized in that: the catalytic absorption system further comprises a shower arranged above the bed of catalytic packing and a first shower connected to the shower. Two circulating pumps, the liquid outlet of the catalytic packed tower communicates with the liquid inlet of the second circulating pump; the equipment also includes an oxidant solution storage tank and a metering pump communicated with the oxidant solution storage tank, the metering pump It is used to transport the oxidant solution into the catalytic packed tower. 3. The equipment for treating low-temperature oil extraction waste gas according to claim 1, characterized in that: the biological filler bed comprises a biological trickling filter bed and a biological filter bed arranged above the biological trickling filter bed , the bio-trickling filter bed and the bio-filter bed are arranged at intervals, and the spraying device includes a control valve, a first nozzle arranged above the bio-filter bed and a first spray nozzle arranged between the bio-trickling filter bed and the bio-trickling filter bed. The second nozzle between the biological filter beds, the first nozzle and the second nozzle are both in communication with the first circulation pump, and the control valve is used to control the opening and closing of the first nozzle. 4. A kind of equipment for processing low-temperature oil extraction waste gas according to claim 3, characterized in that: the biodegradation system also includes a replenishment tank communicated with the biological filter tower; the top of the biological filter tower is provided with exhaust vent. 5. The equipment for treating low-temperature oil extraction waste gas according to claim 1, characterized in that: the high-voltage electrostatic degreaser includes a degreaser box, and a high-voltage static electricity generating device accommodated in the degreaser box As well as a conductive collecting plate electrically connected to the high-voltage static electricity generating device, the degreaser box is provided with an exhaust gas inlet and an exhaust gas outlet, and the conductive collecting plate is arranged between the exhaust gas inlet and the exhaust gas outlet. 6. The equipment for treating waste gas from low-temperature oil extraction according to claim 5, characterized in that: the high-voltage electrostatic degreaser also includes a centrifugal drive accommodated in the degreaser box, and the centrifugal drive is used for Drive the conductive collecting plate to rotate in the degreaser box; the degreaser box is provided with an oil discharge through hole, the bottom of the degreaser box is provided with an oil collection tank, and the degreaser box passes through The oil discharge through hole communicates with the oil sump. 7. The equipment for treating waste gas from low-temperature oil extraction according to claim 5, characterized in that: the inner wall of the waste gas inlet and the inner wall of the waste gas outlet are both clamped with grilles. 8. The equipment for treating waste gas from low-temperature oil extraction according to claim 5, characterized in that: the equipment also includes a mechanical centrifugal oil removal device, the air outlet of the mechanical centrifugal oil removal device communicates with the waste gas inlet . 9. A method for treating low-temperature oil-pressing waste gas, characterized in that the method adopts the equipment described in any one of claims 1-8 to treat low-temperature oil-pressing waste gas. 10. The method according to claim 9, characterized in that: comprising the following steps: (S1), activating the biodegradation system: add microorganisms, nutrient solution and water to the biofiltration tower to form a microbial absorption liquid, then start the first circulation pump to make the microbial absorption liquid in the first circulation pump, spray device and biofiltration tower Internal circulation until the microorganisms complete film formation in the biological filler bed; (S2) The exhaust gas from oil extraction is degreased sequentially by the high-voltage electrostatic degreaser, the catalytic oxidation by the catalytic absorption system, and the microbial degradation by the biodegradation system, that is, the treatment of the exhaust gas from oil extraction at low temperature is completed.