CN218393055U

CN218393055U - Sludge pyrohydrolysis waste gas deodorization device

Info

Publication number: CN218393055U
Application number: CN202122482741.6U
Authority: CN
Inventors: 曹飞飞; 邹淑英; 王书红; 金顺利; 陈步东
Original assignee: Hangzhou Chuhuan Science And Technology Co ltd
Current assignee: Hangzhou Chuhuan Science And Technology Co ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2023-01-31
Anticipated expiration: 2031-10-14

Abstract

The utility model discloses a mud pyrohydrolysis waste gas deodorizing device, include the heat exchanger, the alkali wash that link together in proper order through the pipeline and spray equipment, oxidation spray equipment, photodissociation adsorption reactor, fan and aiutage, be equipped with the waste gas import on the heat exchanger, be equipped with exhaust outlet on the aiutage. To the technical problem that the odor concentration control that adopts conventional, single waste gas deodorization technology hardly with mud pyrohydrolysis waste gas is within the national standard limit value, the utility model provides a mud pyrohydrolysis waste gas deodorizing device, it can the efficient handle the foul smell pollutant of high concentration for waste gas odor concentration can stable control within the national standard limit value.

Description

Sludge pyrohydrolysis waste gas deodorization device

Technical Field

The utility model relates to a waste gas deodorization technical field, concretely relates to mud pyrohydrolysis waste gas deodorizing device.

Background

Along with the development of the national urbanization process in recent years, the construction scale of urban sewage plants is larger and larger, and the amount of generated sludge is increased dramatically. How to treat the sludge is a great problem related to the livelihood. Wherein, because the sludge treatment and disposal process can produce a large amount of malodorous substances, such as ammonia gas, hydrogen sulfide, methyl mercaptan, dimethyl disulfide and the like, the treatment and disposal process brings great troubles to enterprise staff and surrounding residents.

At present, various processes and devices for sludge treatment and disposal are available, wherein the foul substances generated in the thermal hydrolysis process are far greater than those generated in other processes due to the direct hydrolysis of sludge by high-temperature steam. The odor concentration is difficult to control within the national standard limit by adopting the conventional and single exhaust gas deodorization process, so that a more efficient and stable exhaust gas deodorization device needs to be developed aiming at the thermal hydrolysis process.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

To the technical problem that the odor concentration control that adopts conventional, single waste gas deodorization technology hardly with mud pyrohydrolysis waste gas is within the national standard limit value, the utility model provides a mud pyrohydrolysis waste gas deodorizing device, it can the efficient handle the foul smell pollutant of high concentration for waste gas odor concentration can stable control within the national standard limit value.

2. Technical scheme

In order to solve the above problem, the utility model provides a technical scheme does:

the utility model provides a mud pyrohydrolysis waste gas deodorizing device, includes the heat exchanger, alkali wash spray equipment, oxidation spray equipment, photodissociation adsorption reactor, fan and the aiutage that link together in proper order through the pipeline, be equipped with the waste gas import on the heat exchanger, be equipped with the exhaust outlet on the aiutage.

Optionally, the waste gas flows from bottom to top in the alkaline washing spraying device, and an alkaline washing tower packing layer, an alkaline liquor spraying layer and a defogging layer are sequentially arranged from bottom to top in the alkaline washing spraying device.

Optionally, a plurality of alkali liquor spray nozzles arranged towards the packing layer of the alkaline washing tower are arranged in the alkali liquor spray layer, and the alkali liquor spray nozzles are communicated with an alkaline washing tower water tank arranged outside the alkaline washing spray device through an alkali liquor pipeline.

Optionally, the waste gas flows from bottom to top in the oxidation spraying equipment, and an oxidation tower packing layer, an oxidation liquid spraying layer and a demisting layer are sequentially arranged from bottom to top in the oxidation spraying equipment.

Optionally, a plurality of oxidizing liquid nozzles arranged towards the packing layer of the oxidation tower are arranged in the oxidizing liquid spraying layer, and the oxidizing liquid nozzles are communicated with an oxidizing tower water tank arranged outside the oxidizing spraying equipment through oxidizing liquid pipelines.

Optionally, a photolysis section and an adsorption section are sequentially arranged in the photolysis reactor along the flowing direction of the waste gas.

Optionally, an ultraviolet lamp tube is arranged in the photolysis section.

Optionally, a dry adsorbent for adsorbing or degrading ozone is arranged in the adsorption section.

Optionally, the exhaust gas monitoring device is arranged between the fan and the exhaust funnel.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:

(1) This mud pyrohydrolysis waste gas deodorizing device can the efficient handle the foul smell pollutant of high concentration for waste gas foul smell concentration can stable control within the national standard limit value, through alkaline cleaning, oxidation, the synergism of light desorption device, guaranteed odor concentration's discharge to reach standard on the one hand, on the other hand has also eliminated because chlorine residue and the ozone pollution that oxidizing equipment brought, has wholly reduced the destructiveness to atmospheric environment.

Drawings

FIG. 1 is a schematic structural view of a sludge pyrohydrolysis waste gas deodorization device according to an embodiment of the present invention;

1. a heat exchanger; 2. alkali washing spray equipment; 21. a packing layer of the alkaline washing tower; 22. alkali liquor spraying layer; 23. a defogging layer; 24. an alkali liquor spray head; 25. an alkaline liquor line; 26. a caustic tower water tank; 3. oxidizing spraying equipment; 31. a packing layer of the oxidation tower; 32. an oxidizing liquid spraying layer; 33. a demisting layer; 34. an oxidizing liquid spray head; 35. an oxidizing liquid pipeline; 36. an oxidation tower water tank; 4. a photolytic adsorption reactor; 41. a photolysis section; 42. an adsorption section; 5. a fan; 6. an exhaust funnel; 7. an exhaust gas monitor.

Detailed Description

For further understanding of the present invention, the present invention will be described in detail with reference to the accompanying drawings 1 and the embodiments.

With reference to fig. 1, the sludge pyrohydrolysis waste gas deodorization device of the embodiment includes a heat exchanger 1, an alkaline washing spray device 2, an oxidation spray device 3, a photolysis adsorption reactor 4, a fan 5 and an exhaust funnel 6 which are sequentially connected together through a pipeline, wherein the heat exchanger 1 is provided with a waste gas inlet, the exhaust funnel 6 is provided with a waste gas outlet, and sludge pyrohydrolysis waste gas enters from the heat exchanger 1 and is finally discharged from the exhaust funnel 6; the waste gas is collected and then is cooled through the heat exchanger 1, the temperature is reduced to be below 40 ℃, the moisture in the waste gas can be reduced, and partial particles can be settled; the heat exchanger can be in a plate type heat exchanger, a shell-and-tube type heat exchanger and other forms; the cooled waste gas enters an alkaline washing spraying device 2, most of water-soluble substances and acidic substances in the waste gas are removed by using alkaline liquor, and the waste gas has a primary filtering effect on sludge granules contained in the waste gas; then the waste gas passes through an oxidation spraying device 3, most of malodorous organic substances in the waste gas are removed by utilizing the strong oxidizing property of an oxidizing agent, and NH is treated ₃ 、H ₂ S and the like are deeply removed, and the removal efficiency of almost 100 percent can be achieved; the oxidized waste gas enters a photo-desorption reactor 4, the photo-desorption reactor decomposes the oxidant escaped from the oxidation equipment by using high-energy ultraviolet light, further eliminates toxic substances in the waste gas, and adsorbs ozone generated by the ultraviolet photolysis module and other escaped substances in the frontTo further reduce the emission index of the exhaust gas; fan 5 adopts the rear-mounted design for entire system keeps negative pressure state, prevents that waste gas is excessive in the processing procedure, influences deodorization effect.

This mud pyrohydrolysis waste gas deodorizing device can the high-efficient stench pollutant of handling high concentration for waste gas stench concentration can stable control within the national standard limit, through alkali wash, oxidation, the synergism of light desorption device, guaranteed odor concentration's discharge to reach standard on the one hand, on the other hand has also eliminated because chlorine residue and the ozone pollution that oxidizing equipment brought, has wholly reduced the destructive power to atmospheric environment.

As an alternative of the utility model, the waste gas flows from bottom to top in the alkaline washing spray device 2, the alkaline washing tower inlet is arranged at the middle lower part of the alkaline washing spray device 2, the alkaline washing tower outlet is arranged at the top part of the alkaline washing spray device 2, the alkaline washing tower packing layer 21, the alkaline liquor spray layer 22 and the demisting layer 23 are sequentially arranged from bottom to top in the alkaline washing spray device 2, a plurality of alkaline liquor spray nozzles 24 arranged towards the alkaline washing tower packing layer 21 are arranged in the alkaline liquor spray layer 22, the plurality of alkaline liquor spray nozzles 24 are communicated with the alkaline washing tower water tank 26 arranged outside the alkaline washing spray device 2 through an alkaline liquor pipeline 25, the alkali liquor can be composed of one or a plurality of mixtures of sodium hydroxide, potassium hydroxide, sodium carbonate and sodium bicarbonate, the pH value range of circulating water in a water tank of the alkaline tower is 9-12, the spraying of the alkali liquor can be driven by a biochemical pump, the spraying mode is continuous spraying, the spraying amount is set according to the concentration of pollutants in waste gas and generally adopts 1-5L/m < 3 > of the volume of the waste gas, a high-efficiency demister is arranged in the demisting layer 23, and the high-efficiency demister can be in various forms such as a wire mesh demister, a folded plate demister, a tubular demister and a ridge demister; the alkaline washing tower filling material is mainly inert filling material, and can be one or a combination of more of polypropylene plastic balls, ceramics, polyurethane foam, volcanic rock, ceramsite and the like; in the alkali washing spraying equipment 2, gas is in gas-liquid contact (gas-liquid direction is opposite) with alkali liquor sprayed by an alkali liquor spray head 24 in the process that the gas moves from bottom to top, wherein a packing layer 21 of an alkali washing tower is used for prolonging the retention time of waste gas so that the waste gas is fully contacted with the alkali liquor, and in the contact process, the alkali liquor reacts with acidic substances in the waste gas on one hand to remove most acidic pollutants; on the other hand, the content of the particulate matters in the exhaust gas is further reduced through the spraying effect.

As an alternative of the present invention, the waste gas flows from bottom to top in the oxidation spraying device 3, the oxidation tower packing layer 31, the oxidation liquid spraying layer 32 and the demisting layer 33 are sequentially arranged from bottom to top in the oxidation spraying device 3, the basic structure of the oxidation spraying device 3 is the same as that of the alkali washing spraying device 2, and the oxidation liquid can be composed of one or more mixtures of sodium hypochlorite, sodium chlorite, chlorine dioxide, hydrogen peroxide and the like; a plurality of oxidizing liquid spray nozzles 34 arranged towards the oxidizing tower packing layer 31 are arranged in the oxidizing liquid spraying layer 32, the oxidizing liquid spray nozzles 34 are communicated with an oxidizing tower water tank 36 arranged outside the oxidizing spraying equipment 3 through oxidizing liquid pipelines 35, the OPR in the oxidizing tower water tank 36 is controlled to be more than 600mV, and the oxidizing liquid spray nozzles 34, the oxidizing liquid pipelines 35 and the oxidizing tower water tank 36 all adopt fluoroplastics as raw materials to prevent oxidation by strong oxidizing agents.

As an alternative of the present invention, a photolysis section 41 and an adsorption section 42 are sequentially disposed in the photolysis adsorption reactor 4 along the flow direction of the waste gas, an ultraviolet lamp tube is disposed in the photolysis section 41, the ultraviolet lamp tube is an ultraviolet lamp tube capable of generating 185nm, and the generation form can be high-pressure ultraviolet, microwave ultraviolet, or other multiple forms; the adsorption section 42 is internally provided with a dry adsorbent for adsorbing or degrading substances such as ozone and the like, the dry adsorbent can be made of an activated carbon-based material, a transition metal material (such as a Mn-based adsorbent) and a combination substance of activated carbon and a metal material, and the combination mode of the activated carbon and the metal material can be physical mixing or chemical synthesis; the photolysis section 41 mainly decomposes the oxidant escaping from the oxidation spraying equipment by using high-energy ultraviolet light, and further eliminates toxic substances in the waste gas; the adsorption section 42 is used to adsorb the ozone generated by the uv photolysis module and other substances escaping from the uv photolysis module, so as to further reduce the emission index of the exhaust gas.

As the utility model discloses an alternative, for the convenience of real-time supervision exhaust emission index, still including locating the exhaust gas monitoring appearance 7 between fan 5 and the aiutage 6.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. The utility model provides a mud pyrohydrolysis waste gas deodorizing device which characterized in that: the device comprises a heat exchanger, an alkaline washing spray device, an oxidation spray device, a photolysis adsorption reactor, a fan and an exhaust funnel which are sequentially connected together through pipelines, wherein a waste gas inlet is formed in the heat exchanger, and a waste gas outlet is formed in the exhaust funnel.

2. The sludge pyrohydrolysis exhaust gas deodorization device according to claim 1, characterized in that: and the waste gas flows from bottom to top in the alkali washing spraying equipment, and an alkali washing tower packing layer, an alkali liquor spraying layer and a demisting layer are sequentially arranged from bottom to top in the alkali washing spraying equipment.

3. The sludge pyrohydrolysis exhaust gas deodorization device according to claim 2, characterized in that: and a plurality of alkali liquor spray nozzles arranged towards the packing layer of the alkaline washing tower are arranged in the alkali liquor spray layer, and the alkali liquor spray nozzles are communicated with an alkaline washing tower water tank arranged outside the alkaline washing spray equipment through an alkali liquor pipeline.

4. The sludge pyrohydrolysis exhaust gas deodorization device according to claim 1, characterized in that: and the waste gas flows from bottom to top in the oxidation spraying equipment, and an oxidation tower packing layer, an oxidation liquid spraying layer and a demisting layer are sequentially arranged from bottom to top in the oxidation spraying equipment.

5. The sludge pyrohydrolysis exhaust gas deodorization device according to claim 4, characterized in that: and a plurality of oxidizing liquid spray heads arranged towards the packing layer of the oxidation tower are arranged in the oxidizing liquid spray layer, and are communicated with an oxidation tower water tank arranged outside the oxidation spray equipment through oxidizing liquid pipelines.

6. The sludge pyrohydrolysis exhaust gas deodorization device according to claim 1, characterized in that: and a photolysis section and an adsorption section are sequentially arranged in the photolysis adsorption reactor along the flowing direction of the waste gas.

7. The sludge pyrohydrolysis exhaust gas deodorization device according to claim 6, characterized in that: an ultraviolet lamp tube is arranged in the photolysis section.

8. The sludge pyrohydrolysis exhaust gas deodorization device according to claim 6, characterized in that: and a dry adsorbent for adsorbing or degrading ozone is arranged in the adsorption section.

9. The sludge pyrohydrolysis off-gas deodorization device as set forth in any one of claims 1 to 8, wherein: the exhaust gas monitoring device is arranged between the fan and the exhaust funnel.