CN213375919U

CN213375919U - Complete device for waste gas treatment

Info

Publication number: CN213375919U
Application number: CN202021992130.5U
Authority: CN
Inventors: 郭利荣; 李伟; 张政强; 陈波; 倪麟杰; 郭怀清
Original assignee: Zhejiang Wantai Environmental Engineering Co ltd
Current assignee: Zhejiang Wantai Environmental Engineering Co ltd
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2021-06-08
Anticipated expiration: 2030-09-11

Abstract

The application relates to a complete device for waste gas treatment, and relates to the technical field of environmental pollution treatment. At present, the mature methods for purifying and deodorizing waste gas comprise a chemical washing method, an adsorption method, a biodegradation method and the like, but the types of malodorous components contained in the waste gas are more, each waste gas treatment method has limitations, and the purification and deodorization effects on the waste gas are not ideal. This application includes the washing spray column, the oxidation spray column, wash with alkaline spray column and bio-trickling filter, the washing spray column, the oxidation spray column, wash with alkaline spray column and bio-trickling filter and connect according to order in proper order, the washing spray column is equipped with inlet channel, bio-trickling filter is equipped with exhaust passage, still be equipped with reserve deodorization purge tower between bio-trickling filter and the exhaust passage, the last exhaust fan that is equipped with of exhaust passage, through uniting chemical washing method and bio-trickling filter method, improve the purifying effect to malodorous substance in the waste gas, in order to satisfy higher exhaust emission requirement.

Description

Complete device for waste gas treatment

Technical Field

The application relates to the technical field of environmental pollution treatment, in particular to a complete waste gas treatment device.

Background

The household garbage can generate and emit waste gas in the garbage transportation and disposal process, and the main components of the waste gas are volatile substances such as hydrogen sulfide, ammonia, methyl mercaptan, methyl sulfide and the like. The waste gas has strong volatility, which not only pollutes the living environment, but also seriously threatens the human health. According to the relevant requirements, the generated waste gas must be deodorized and the treated gas is ensured to reach the emission standard.

The currently common waste gas treatment methods comprise a chemical scrubbing method, an adsorption method, a catalytic combustion method, a biodegradation method and the like, wherein the chemical scrubbing method is used for directly removing certain components in the waste gas by utilizing the characteristic that the waste gas can chemically react with an absorption liquid, is suitable for treating the waste gas with large gas volume and high concentration, and has strong pertinence. The biological degradation method mainly comprises a biological filter method and a biological trickling filter method, wherein in the biological filter method, malodorous gas passes through a filler layer attached with microorganisms from bottom to top after being subjected to pretreatment processes such as dust removal, humidification, temperature reduction and the like, the malodorous gas is transferred into a water-microorganism mixed phase from a gas phase, and malodorous substances are decomposed by the metabolism of the microorganisms; the biological trickling filter method has the same deodorization mechanism as the biological filter method, but the biological trickling filter method adopts inert filler materials such as charcoal, plastic and the like which can not provide nutrient substances, so that the quantity of microorganisms in the filter is large, the pollution load which can be borne is larger, and the operation condition is easy to control.

Because the types of malodorous components in the waste gas are more, various waste gas treatment methods have limitations, the purification effect on the malodorous substances in the waste gas is not ideal, and further deodorization treatment is still needed to meet higher emission requirements.

SUMMERY OF THE UTILITY MODEL

In order to improve the deodorization purifying effect to waste gas, satisfy higher exhaust emission index, this application provides a waste gas treatment integrated equipment.

The application provides a waste gas treatment integrated equipment adopts following technological means:

the utility model provides a waste gas treatment integrated equipment, includes washing spray column, oxidation spray column, alkali wash spray column and bio-trickling filter, and washing spray column, oxidation spray column, alkali wash spray column and bio-trickling filter are connected according to order in proper order, and washing spray column is equipped with inlet channel, and bio-trickling filter is equipped with exhaust passage.

By adopting the technical scheme, the chemical washing method and the biological trickling filter method are combined, so that the purification effect of malodorous substances in the waste gas is improved, and the higher waste gas emission requirement is met; the water-washing spray tower can remove dust particles, ammonia gas and other water-soluble components in the waste gas, and the organic matters in the waste gas are decomposed more easily by microorganisms through metabolism after the waste gas is subjected to pretreatment such as dust removal, humidification and cooling of the water-washing spray tower; the oxidation spray tower is used for oxidizing organic sulfur, organic amines and other substances in the waste gas into compounds with lighter odor or higher solubility, and is favorable for improving the purification effect of the subsequent alkali washing spray tower on the waste gas.

Preferably, a standby deodorization purification tower is arranged between the biological trickling filter and the exhaust channel.

Through adopting above-mentioned technical scheme, can carry out purification treatment to the waste gas after biological trickling filter handles, further get rid of the foul smell material in the waste gas.

Preferably, the water washing spray tower, the oxidation spray tower and the alkali washing spray tower respectively comprise a tower body, an air inlet is formed in the outer peripheral surface of the tower body close to the bottom of the tower body, an air outlet is formed in the upper end of the tower body, a spraying cavity is formed in the tower body, the spraying cavity comprises an air inlet layer, a first packing layer, a first spraying layer and a defogging layer from bottom to top, a plurality of packing elements are filled in the first packing layer, a plurality of first nozzles are arranged in the first spraying layer, and a defogger is arranged in the defogging layer; a liquid storage tank is arranged outside the tower body, a first liquid conveying pipeline is arranged between the liquid storage tank and the first nozzle, and a first spray pump is arranged on the first liquid conveying pipeline.

Through adopting above-mentioned technical scheme, first spray pump carries the absorption liquid in with the receiver to spray the cavity in, then sprays to the filler piece under the effect of first nozzle on, the in-process of the upward motion of layer of admitting air of waste gas, waste gas and the absorption liquid on filler piece surface fully contact to absorb dust or organic pollutant in the waste gas.

Preferably, the spraying cavity further comprises a second packing layer and a second spraying layer which are arranged between the first spraying layer and the demisting layer, the second spraying layer is arranged at the upper end of the second packing layer, the packing piece is filled in the second packing layer, a plurality of second nozzles are arranged in the second spraying layer, and the number of the second nozzles is greater than that of the first nozzles; a second liquid conveying pipeline is arranged between the liquid storage tank and the second nozzle, and a second spray pump is arranged on the second liquid conveying pipeline.

Through adopting above-mentioned technical scheme, the hydrojet pressure that first sprayed the layer and spray the layer with the second is different, and the concentration range that absorbs acid gas in the waste gas is also different, can also play the effect of multiple purification.

Preferably, the lower ends of the first packing layer and the second packing layer are both provided with packing support plates, and the upper ends of the first packing layer and the second packing layer are both provided with packing press plates.

Through adopting above-mentioned technical scheme, the backup pad that packs plays supporting role to the packing, and the clamp plate that packs presses and locates the upper end of packing, is favorable to avoiding the packing to take place the condition not hard up and jump under the effect of air current, is favorable to waste gas and the absorption liquid on the packing to fully contact.

Preferably, the liquid storage tank is communicated with the air inlet layer of the spraying cavity.

Through adopting above-mentioned technical scheme, the absorption liquid downwards flows into the bottom on air inlet layer after absorbing the foul substance in the waste gas, then gets into the liquid storage tank to cyclic utilization once more can save resources, cut down the cost.

Preferably, the first packing layer and the second packing layer are both provided with liquid distributors.

By adopting the technical scheme, the absorption liquid can be re-accumulated by the liquid distributor in the process of flowing downwards in the first packing layer and the second packing layer, and then is uniformly distributed and sprayed onto the lower packing element, so that the probability of wall flow in the flowing process of the absorption liquid is reduced.

Preferably, the tower body comprises a glass fiber reinforced plastic inner plate, a steel framework and a stainless steel outer shell from inside to outside.

Through adopting above-mentioned technical scheme for tower body itself has better acid and alkali resistance, and intensity is higher, and is reliable and stable.

In summary, the present application includes at least one of the following beneficial technical effects:

1. in the scheme, a chemical washing method and a biological trickling filter method are combined, so that the purification effect on malodorous substances in the waste gas is improved, and the higher waste gas emission requirement is met; the water-washing spray tower can remove dust particles, ammonia gas and other water-soluble components in the waste gas, and the organic matters in the waste gas are decomposed more easily by microorganisms through metabolism after the waste gas is subjected to pretreatment such as dust removal, humidification and cooling of the water-washing spray tower; the oxidation spray tower is used for oxidizing organic sulfur, organic amines and other substances in the waste gas into compounds with lighter odor or higher solubility, and is beneficial to improving the purification effect of the subsequent alkali washing spray tower on the waste gas;

2. in the scheme, the standby purification and deodorization tower is arranged, so that the waste gas treated by the biological trickling filter can be purified, and the malodorous substances in the waste gas can be further removed;

3. in this scheme, the first layer that sprays is different with the hydrojet pressure on second spraying layer, and the concentration range that absorbs acid gas in the waste gas is also different, can also play multiple effect of purifying.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of the present application;

FIG. 2 is a cross-sectional view of the oxidation spray tower of FIG. 1;

FIG. 3 is an enlarged schematic view at A in FIG. 2;

fig. 4 is a cross-sectional view of the bio-trickling filter of fig. 1.

Description of reference numerals: 1. washing the spray tower with water; 11. a tower body; 111. an air inlet; 112. an exhaust port; 113. a glass fiber reinforced plastic inner plate; 114. a steel framework; 115. a stainless steel housing; 116. a perspective window; 12. a spray cavity; 121. an air intake layer; 122. a first filler layer; 1221. a packing member; 1222. a packing support plate; 1223. a packing press plate; 1224. a liquid distributor; 123. a first spray layer; 1231. a first nozzle; 124. a second packing layer; 125. a second spray layer; 1251. a second nozzle; 126. a demisting layer; 1261. a demister; 13. a liquid storage tank; 131. a first infusion line; 132. a first spray pump; 133. a second infusion pipeline; 134. a second spray pump; 14. a liquid adding tank; 2. oxidizing the spray tower; 3. washing a spray tower with alkali; 4. a biological trickling filter; 41. a trickling filtration tower; 411. a third packing layer; 412. an inert filler; 42. a nutrient solution tank; 421. a third infusion pipeline; 422. a third nozzle; 423. a nutrient water pump; 5. an air intake passage; 6. an exhaust passage; 61. an exhaust fan; 7. a spare deodorizing and purifying tower; 8. a gas transmission pipeline.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses exhaust-gas treatment integrated equipment.

Example 1:

referring to fig. 1, a complete equipment for waste gas treatment comprises a water washing spray tower 1, an oxidation spray tower 2, an alkali washing spray tower 3 and a biological trickling filter 4, wherein the water washing spray tower 1, the oxidation spray tower 2, the alkali washing spray tower 3 and the biological trickling filter 4 are sequentially connected, the water washing spray tower 1 is provided with an air inlet channel 5, and the biological trickling filter 4 is provided with an air outlet channel 6. The embodiment aims to combine a chemical washing method and a biological trickling filter method, improve the purification effect on malodorous substances in waste gas and meet the higher requirement on waste gas emission.

Referring to fig. 1 and 2, a spare deodorizing and purifying tower 7 is arranged between the biological trickling filter 4 and the exhaust passage 6, an activated carbon adsorbent or a natural plant liquid deodorant is filled in the spare deodorizing and purifying tower 7, and an exhaust fan 61 is arranged on the exhaust passage 6. If the waste gas still can not reach the waste gas emission standard after passing through the biological trickling filter 4, the standby deodorization purification tower 7 can purify the waste gas and further remove the malodorous substances in the waste gas. The structures of the water washing spray tower 1, the oxidation spray tower 2 and the alkali washing spray tower 3 are basically the same and all comprise a tower body 11, an air inlet 111 is arranged on the outer peripheral surface of the tower body 11 close to the bottom, an air outlet 112 is arranged on the top end of the tower body 11, and a gas transmission pipeline 8 is arranged between the water washing spray tower 1, the oxidation spray tower 2, the alkali washing spray tower 3, the biological trickling filter 4 and the standby deodorization purification tower 7. The waste gas enters the water washing spray tower 1 from the air inlet channel 5, then passes through the oxidation spray tower 2, the alkali washing spray tower 3, the biological trickling filter 4 and the standby deodorization purification tower 7 in sequence under the conveying of the air conveying pipeline 8, and is finally discharged from the exhaust channel 6.

Referring to fig. 2 and 3, the tower body 11 includes, from inside to outside, a glass fiber reinforced plastic inner plate 113, a steel framework 114, and a stainless steel outer shell 115, which have good acid and alkali resistance and high strength, three transparent windows 116 (see fig. 1) are disposed on the outer circumferential surface of the tower body 11, and a manhole (not shown in the figure) for internal maintenance is further disposed on the tower body 11. The tower body 11 is internally provided with a spraying cavity 12, the spraying cavity 12 comprises an air inlet layer 121, a first packing layer 122, a first spraying layer 123, a second packing layer 124, a second spraying layer 125 and a demisting layer 126 from bottom to top, the upper end of the first spraying layer 123 is provided with a plurality of first nozzles 1231, the upper end of the second spraying layer 125 is provided with a plurality of second nozzles 1251, the number of the second nozzles 1251 is larger than that of the first nozzles 1231, and the number of the first nozzles 1231 and the number of the second nozzles 1251 are determined according to the diameter of the tower body 11 and the spraying range of the nozzles. The first packing layer 122 and the second packing layer 124 are filled with a plurality of packing elements 1221, the porosity of the packing elements 1221 is high and is hollow and spherical, and the packing elements 1221 are usually made of polypropylene or ceramic, and need to have good acid and alkali resistance. A liquid storage tank 13 is arranged outside the tower body 11, absorption liquid is stored in the liquid storage tank 13, liquid adding tanks 14 are arranged beside the liquid storage tanks 13 of the oxidation spray tower 2 and the alkali washing spray tower 3, and the liquid storage tanks 13 are connected with the liquid adding tanks 14 through pipelines. A first infusion pipeline 131 is arranged between the liquid storage tank 13 and the first nozzle 1231, and a first spray pump 132 is arranged on the first infusion pipeline 131; a second infusion pipeline 133 is arranged between the liquid storage tank 13 and the second nozzle 1251, and a second spray pump 134 is arranged on the second infusion pipeline 133. The demister 1261 is provided at the upper end of the demisting layer 126, and the air inlet layer 121 is communicated with the liquid storage tank 13.

Under the driving of the first spray pump 132 and the second spray pump 134, the absorption liquid in the liquid storage tank 13 is conveyed into the spray cavity 12 through the first liquid conveying pipeline 131 and the second liquid conveying pipeline 133, and the absorption liquid is attached to the packing 1221 under the spraying action of the first nozzle 1231 and the second nozzle 1251. The exhaust gas enters the air inlet layer 121 from the air inlet 111 of the tower body 11, and during the upward movement of the exhaust gas, the exhaust gas is in full contact with the absorption liquid on the surface of the packing member 1221, so that the dust or organic pollutants in the exhaust gas are absorbed. If the number of the second nozzles 1251 is greater than that of the first nozzles 1231, the first spray layer 123 and the second spray layer 125 have different spray pressures, and the concentration ranges of the acid gases in the absorbed exhaust gas are different, thereby achieving the effect of multiple purification.

Referring to fig. 1, the absorption liquid used by the water-washing spray tower 1 is tap water, which is used for removing dust particles in the exhaust gas and removing ammonia gas and other water-soluble components in the exhaust gas; the absorption liquid used by the oxidation spray tower 2 is an oxidant solution, usually a sulfuric acid solution, a potassium permanganate solution, a sodium hypochlorite solution and the like are used, and the absorption liquid used by the alkaline washing spray tower 3 is usually a sodium hydroxide solution and is used for carrying out a neutralization reaction with acid components in the waste gas, so that the aim of deodorization is fulfilled. The oxidant solution is used for oxidizing organic sulfur, organic amines and other substances in the waste gas into compounds with lighter odor or higher solubility, and is beneficial to the subsequent purification effect of the sodium hydroxide solution on the waste gas.

Referring to fig. 1 and 2, during the process of upward movement and purification of the exhaust gas in the spray cavity 12, the exhaust gas is likely to generate mist with a particle size of ten to sixty microns, and the mist contains not only the absorption liquid but also possibly dissolved sulfuric acid, sulfate, sulfur dioxide, and the like. The demister 1261 is arranged to separate gas from liquid, and the mist particles are attached to the demister 1261 by using the inertia impact effect of the movement of the waste gas, so that the corrosion of the mist particles on the gas transmission pipeline 8 and subsequent purification equipment is reduced, and the mist particles are accumulated on the demister 1261 more and then form mist drops to flow down. The absorption liquid absorbing the pollutants on the surface of the filler 1221 and the mist accumulated by the demister 1261 both flow downwards to the bottom of the air inlet layer 121, and the absorption liquid can be recycled because the air inlet layer 121 is communicated with the liquid storage tank 13. The liquid storage tank 13 of the water washing spray tower 1 needs to be replaced with tap water regularly, and the tap water and dust adsorbed by the tap water are discharged in time. In the liquid storage tanks 13 of the oxidation spray tower 2 and the alkaline washing spray tower 3, if the concentrations of the oxidant solution and the sodium hydroxide solution are reduced, new solution in the liquid adding tank 14 needs to be introduced into the liquid storage tanks 13 to ensure the purification effect of the absorption liquid on the waste gas.

The lower ends of the first packing layer 122 and the second packing layer 124 are both provided with a packing support plate 1222, the upper ends of the first packing layer 122 and the second packing layer 124 are both provided with a packing pressing plate 1223, the packing support plate 1222 and the packing pressing plate 1223 are both in a grid shape, and a liquid distributor 1224 is arranged in the middle between the packing support plate 1222 and the packing pressing plate 1223. The packing support plate 1222 plays a supporting role in the packing 1221, and the packing pressing plate 1223 is pressed on the upper end of the packing 1221, so that the situation that the packing 1221 loosens and jumps under the action of air flow is avoided. In the process that the absorption liquid flows downwards along the packing layer, the wall flow phenomenon can occur, so that gas-liquid two phases are unevenly distributed in the packing layer, the mass transfer efficiency is reduced, and the purification and deodorization effects on the waste gas are reduced. The liquid distributor 1224 is configured to allow the absorption liquid to flow to an intermediate position, redistribute the absorption liquid uniformly, and spray the absorption liquid onto the lower packing 1221.

Referring to fig. 4, the bio-trickling filter 4 includes a trickling filter 41 and a nutrient solution tank 42 disposed at one side of the trickling filter 41, a third packing layer 411 is disposed inside the trickling filter 41, the third packing layer 411 is filled with a plurality of inert packing materials 412, and microorganisms are attached to the surfaces of the inert packing materials 412 to produce and form a biofilm. Nutrient solution case 42 is equipped with third transfusion pipe 421, and third transfusion pipe 421 extends to the top of inert filler 412 from nutrient solution case 42, and is equipped with a plurality of third nozzle 422 on the third transfusion pipe 421, is equipped with nutritive water pump 423 on the third transfusion pipe 421. The waste gas enters a biological trickling filter 4 after passing through an alkaline washing spray tower 3, part of organic waste gas in the waste gas is converted into harmless water and carbon dioxide through the catabolism of microorganisms, energy is provided for the microorganisms, and part of organic pollutants is converted into life substances of the microorganisms through anabolism. After the waste gas is pretreated by dust removal, humidification, temperature reduction and the like of the water washing spray tower 1 (shown in figure 1), organic matters in the waste gas are decomposed more easily by microorganisms through metabolism. The inert filler 412 only acts as a carrier for the microorganisms, has high porosity and long service life, and does not need to be replaced frequently. The nutrient solution is stored in the nutrient solution tank 42 to facilitate adjustment of the humidity and PH of the nutrient solution for providing nutrients and trace elements to the microorganisms, so that the reaction conditions of the bio-trickling filter 4 are easily controlled.

The implementation principle of the embodiment is as follows: by arranging the water washing spray tower 1, the oxidation spray tower 2, the alkali washing spray tower 3 and the biological trickling filter 4, a chemical washing method and a biological filter method are combined, so that the purification effect on malodorous substances in waste gas is improved, and the higher waste gas emission requirement is met; the waste gas is purified by the biological trickling filter 4 and then passes through the standby deodorizing and purifying tower 7 to further treat the malodorous substances in the waste gas.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. An exhaust-gas treatment plant, its characterized in that: including washing spray column (1), oxidation spray column (2), alkali wash spray column (3) and bio-trickling filter (4), washing spray column (1) oxidation spray column (2) alkali wash spray column (3) with bio-trickling filter (4) connect gradually in proper order, washing spray column (1) is equipped with inlet channel (5), bio-trickling filter (4) are equipped with exhaust passage (6).

2. An exhaust treatment plant according to claim 1, wherein: a standby deodorization purification tower (7) is arranged between the biological trickling filter (4) and the exhaust channel (6).

3. An exhaust treatment plant according to claim 1, wherein: the water-washing spray tower (1), the oxidation spray tower (2) and the alkali-washing spray tower (3) respectively comprise a tower body (11), an air inlet (111) is formed in the outer peripheral surface of the tower body (11) close to the bottom, an air outlet (112) is formed in the upper end of the tower body (11), a spray cavity (12) is formed in the tower body (11), the spray cavity (12) comprises an air inlet layer (121), a first packing layer (122), a first spray layer (123) and a demisting layer (126) from bottom to top, a plurality of packing pieces (1221) are filled in the first packing layer (122), a plurality of first nozzles (1231) are arranged in the first spray layer (123), and a demister (1261) is arranged in the demisting layer (126); the tower body (11) outside is equipped with liquid reserve tank (13), liquid reserve tank (13) with be equipped with first infusion pipeline (131) between first nozzle (1231), be equipped with first spray pump (132) on first infusion pipeline (131).

4. An exhaust treatment plant according to claim 3, wherein: the spraying cavity (12) further comprises a second packing layer (124) and a second spraying layer (125) which are arranged between the first spraying layer (123) and the defogging layer (126), the second spraying layer (125) is arranged at the upper end of the second packing layer (124), the packing piece (1221) is filled in the second packing layer (124), a plurality of second nozzles (1251) are arranged in the second spraying layer (125), and the number of the second nozzles (1251) is larger than that of the first nozzles (1231); a second infusion pipeline (133) is arranged between the liquid storage tank (13) and the second nozzle (1251), and a second spray pump (134) is arranged on the second infusion pipeline (133).

5. An exhaust treatment plant according to claim 4, wherein: the lower ends of the first packing layer (122) and the second packing layer (124) are respectively provided with a packing support plate (1222), and the upper ends of the first packing layer (122) and the second packing layer (124) are respectively provided with a packing press plate (1223).

6. An exhaust treatment plant according to claim 3, wherein: the liquid storage tank (13) is communicated with the air inlet layer (121) of the spraying cavity (12).

7. An exhaust treatment plant according to claim 4, wherein: a liquid distributor (1224) is disposed in each of the first packing layer (122) and the second packing layer (124).

8. An exhaust treatment plant according to claim 3, wherein: the tower body (11) comprises a glass fiber reinforced plastic inner plate (113), a steel framework (114) and a stainless steel outer shell (115) from inside to outside.