CN218339421U - SDA recycling treatment system for hazardous waste incineration flue gas wet deacidification wastewater - Google Patents
SDA recycling treatment system for hazardous waste incineration flue gas wet deacidification wastewater Download PDFInfo
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- CN218339421U CN218339421U CN202222148037.1U CN202222148037U CN218339421U CN 218339421 U CN218339421 U CN 218339421U CN 202222148037 U CN202222148037 U CN 202222148037U CN 218339421 U CN218339421 U CN 218339421U
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Abstract
The utility model discloses a danger is useless to burn flue gas wet process deacidification waste water SDA retrieval and utilization processing system, include: quench tower, the SDA tower, the active carbon injection pipe, the sack cleaner, the wet process scrubbing tower, chimney and alkali lye feed system, the wet process scrubbing tower exhanst gas outlet passes through the draught fan and is connected with the chimney, alkali lye feed system passes through the lye pump and is connected with wet process scrubbing tower upper end, the wet process scrubbing tower liquid outlet passes through the waste water pump and is connected with SDA tower upper end, the active carbon injection pipe is connected with SDA tower and sack cleaner through the pipeline respectively, the sack cleaner passes through the pipeline and is connected with the wet process scrubbing tower, quench tower, SDA tower and sack cleaner lower extreme are the ash and slag outlet, quench tower has flue gas entry and exhanst gas outlet, quench tower exhanst gas outlet passes through pipeline and SDA tower flue gas entry linkage. The utility model discloses can eliminate the hardened and hardened condition of quench tower inner wall salt deposition, save desalination cost and water cost, reduce sewage treatment cost, ensure the continuous steady operation of system of burning.
Description
Technical Field
The utility model relates to an environmental protection equipment technical field, concretely relates to danger is useless burns flue gas wet process deacidification waste water SDA retrieval and utilization processing system.
Background
In the treatment process of solid waste incineration (such as hazardous waste incineration, medical waste incineration and the like), acidic components (HCl, HF, SO) in smoke generated in the incineration process 2 、SO 3 Etc.) the alkali liquor is generally used for wet washing and removal, the alkali liquor is continuously circulated in a wet washing tower and a circulating alkali liquor pool, and the salt concentration causes the generation of a large amount of high-salt wastewater (the salt concentration can be as high as 18 percent or even higher). For the treatment of high-salinity wastewater, common desalination methods generally include physical methods, chemical methods and biological methods. Physical methods also include thermal separation and membrane separation. The chemical method includes an ion exchange method, an electrodialysis method, an electrodeionization method, an electro-adsorption method, and the like. The processes need to add corresponding treatment systems, are high in cost, and some processes can also generate salt-containing organic matters or inorganic matters again, and the waste salt is used as secondary dangerous waste and needs to be separately disposed of, so that the disposal cost is increased. Raw materialInorganic salts in the method play important roles in promoting enzyme reaction, maintaining membrane balance and regulating osmotic pressure in the microbial growth process. However, the salt concentration is too high, which may inhibit the growth of microorganisms. The microorganism is enabled to operate under low salt concentration (the salt concentration is less than 1%) by a dilution method, so that the waste of water resources is caused, the treatment facility is huge, the investment is increased, and the operation cost is increased.
The prior art provides a quench tower device in the flue gas treatment process of high salt wet deacidification waste water back spraying. When the high-temperature flue gas at the temperature of 550 ℃ below zero at the outlet of the waste heat boiler enters the quench tower and is contacted and collided with the atomized high-salt wastewater, fog drops of the high-salt wastewater can be contacted with the high-temperature flue gas within 1 second and evaporated and vaporized, the temperature of the high-temperature flue gas is rapidly reduced from 550 ℃ to 195 ℃ through heat exchange, and the dioxin is effectively prevented from being synthesized again at the temperature of 200-500 ℃. After the moisture in the high-salt wastewater is atomized, evaporated and vaporized, part of the waste salt is deposited at the bottom of the quenching tower in a dry state, the other part of the waste salt enters a bag-type dust collector along with the flue gas, and the purified flue gas is finally discharged from a chimney.
In the prior art and the device production process, alkali liquor is continuously recycled in a wet washing tower and a circulating alkali liquor pool until salt is saturated to form a high-salt wastewater back-spraying quenching tower, because the high-temperature flue gas temperature from the outlet of a waste heat boiler to 550 ℃ is high, the water in the high-salt wastewater is quickly atomized, evaporated and vaporized, the salt is quickly separated out, waste salt is separated out at the bottom of the quenching tower and is separated out on the inner wall of the quenching tower, a compact salt layer with the thickness of tens of centimeters to several meters is formed in a short time, and the salt hardening causes the rapid deterioration of the operating condition of the quenching tower, thereby causing the parking accident. A salt inhibitor is required to be added at a liquid inlet end in the process of back-spraying the high-salinity wastewater to the quenching tower, the precipitation of crystallized salt is reduced by using the salt inhibitor, and the blockage problem is prevented; meanwhile, a pipeline for introducing clean water is used as dilution water, so that the water cost is increased. Even in the case of some projects, salt deposition and blockage are still caused after the salt inhibitor is used, and the production stability is seriously influenced.
SUMMERY OF THE UTILITY MODEL
Spray drying absorption Process (SDA) Using spray dryingThe principle is that alkaline auxiliary materials (such as lime, caustic soda and the like) are utilized to prepare an alkaline liquid absorbent with a certain concentration, hot flue gas from quenching to 200 ℃ enters an SDA tower and then immediately contacts and collides with atomized alkaline slurry, heat is exchanged, and acid components (HCl, HF, SO) in the flue gas 2 、SO 3 Etc.) is absorbed by alkaline fog drops, and simultaneously the water is evaporated and vaporized, so the method is called semi-dry flue gas deacidification. And a part of waste salt generated after the deacidification reaction is finished is deposited at the bottom of the SDA tower in a dry state, the other part of waste salt enters a bag-type dust collector along with the flue gas, and the purified flue gas is finally discharged from a chimney.
The utility model aims to provide a technical defect that spouts quench tower existence is returned to high salt waste water according to wet process deacidification combines SDA to provide a danger is useless burns flue gas wet process deacidification waste water SDA retrieval and utilization processing system, can eliminate the hardened condition of quench tower inner wall salt that current high salt wet process deacidification waste water spouts quench tower technique and leads to, saves desalination cost and water cost, has reduced the sewage treatment cost, ensures to burn the continuous steady operation of system.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a useless flue gas wet process deacidification waste water SDA retrieval and utilization processing system that burns of danger includes: quench tower, SDA tower, active carbon injection pipe, sack cleaner, wet process scrubbing tower, chimney and alkali lye feed system, the exhanst gas outlet of wet process scrubbing tower pass through the draught fan with the chimney is connected, alkali lye feed system pass through the lye pump with the upper end of wet process scrubbing tower is connected, the liquid outlet of wet process scrubbing tower passes through the waste water pump and is connected with the upper end of SDA tower, the active carbon injection pipe respectively through the pipeline with the exhanst gas outlet of SDA tower with the flue gas entry linkage of sack cleaner, the exhanst gas outlet of sack cleaner pass through the pipeline with the flue gas entry linkage of wet process scrubbing tower, quench tower, SDA tower with the lower extreme of sack cleaner is the ash export, the quench tower has a flue gas entry and a flue gas export, the flue gas outlet of quench tower pass through the pipeline with the flue gas entry linkage of SDA tower.
The utility model discloses in directly reusing the SDA technology with the salt waste water that produces behind the wet process deacidification processing, can rely on the current line of burning to handle, need not increase other equipment, replace fresh alkali lye to contain the wet process deacidification waste water of alkali lye and be used as the SDA semi-dry deacidification, salt and the salt in the wet process deacidification waste water that produces after making the deacidification reaction discharge with likepowder form under the SDA tower, reduce the treatment cost who contains salt waste water, can also reduce the quantity of corresponding SDA alkali lye simultaneously.
The utility model discloses in, the useless flue gas wet process deacidification waste water SDA retrieval and utilization processing system that burns of danger still includes control system and the valve that sets up on each pipeline etc. for the conventional technical means in this field in view of control system and each valve installation, the technical personnel in the field are according to the utility model discloses a description can be according to demand adaptability installation control system and each valve etc. consequently, the utility model discloses no longer describe herein any more.
As an optimal selection scheme of danger is useless burns flue gas wet process deacidification waste water SDA retrieval and utilization processing system, alkali lye supply system is including concentrated alkali jar, agitator tank and the dilute alkali jar that connects gradually, the dilute alkali jar passes through the lye pump with the wet process scrubbing tower is connected, the agitator tank is connected with water supply system. Compared with the prior art, the technical scheme has the advantages that the alkali liquor is directly conveyed to the wet washing tower through the alkali liquor pump, the waste water formed in the wet washing tower is directly conveyed to the SDA tower through the waste water pump, a circulating alkali liquor pool is not needed, and the equipment construction cost is saved.
As the preferred scheme of danger waste incineration flue gas wet deacidification waste water SDA retrieval and utilization processing system, the SDA tower includes the tower body, install in the rotary atomizer of tower body upper end with install in the tower body and neighbouring rotary atomizer's flue gas distributor, the waste water pump pass through the pipeline with rotary atomizer connects, the tower body is equipped with the flue gas entry.
As a preferred scheme of the hazardous waste incineration flue gas wet deacidification wastewater SDA recycling treatment system, a flue gas inlet of the tower body is adjacent to a spray nozzle of the rotary atomizer.
The utility model has the advantages that: the utility model uses the hazardous waste incineration flue gas wet deacidification wastewater as SDA water, salt in the wet deacidification wastewater is combined with hot flue gas through the SDA tower, namely, the wet deacidification wastewater containing alkali liquor reacts with acid gas in the SDA tower to achieve the purpose of deacidification, the use amount of fresh alkali liquor is reduced, and the salt is converted into ash to be removed, so that the desalting cost is saved; compared with the traditional SDA, the method has the advantages that the clear water consumption of the SDA tower is eliminated, the water cost is greatly reduced, the high-load operation of an evaporator and the high-pressure operation of sewage treatment caused by high-salinity wastewater treatment in the traditional technology are reduced, and the sewage treatment cost is reduced; compared with the prior art, alkali liquor does not need to be continuously recycled in a wet washing tower and a circulating alkali liquor pool until salt is saturated to form high-salt wastewater back spray, the circulating alkali liquor pool does not need to be invested and built, the generated unsaturated low-salt deacidification wastewater is directly back sprayed to an SDA tower, an expensive salt inhibitor is not needed to be added, the production cost is reduced, meanwhile, the flue gas with lower temperature is one of the favorable conditions that the salt in the high-salt wastewater forms ash slag at the bottom of the tower, the temperature of the flue gas entering the SDA tower is low, the salt hardening of the inner wall of the SDA tower is not easy to occur, the salt hardening condition of the inner wall of the quenching tower caused by the contact reaction of the existing high-salt wet deacidification wastewater back spray quenching tower and the high-temperature flue gas is eliminated, and the continuous and stable operation of a burning system is ensured. The utility model discloses fine social, environmental benefit and economic benefits have.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is the embodiment of the utility model provides a useless flue gas wet deacidification waste water SDA recycling treatment system that burns of danger schematic diagram.
In the figure:
1. a quench tower; 2. an SDA tower; 21. a tower body; 22. rotating the atomizer; 23. a flue gas distributor; 3. an activated carbon injection tube; 4. a bag-type dust collector; 5. a wet scrubbing tower; 6. a chimney; 7. a lye supply system; 71. a concentrated alkali tank; 72. a stirring tank; 73. a dilute alkali tank; 8. an induced draft fan; 9. an alkaline liquid pump; 10. a waste water pump.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but not for indicating or implying that the device or the element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limitations of the present patent, and specific meanings of the above terms can be understood according to specific situations by those of ordinary skill in the art.
In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between components, is to be understood broadly, for example, as being a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, this embodiment provides a danger is useless to burn flue gas wet process deacidification waste water SDA retrieval and utilization processing system, includes: quench tower 1, SDA tower 2, activated carbon injection pipe 3, the sack cleaner 4, wet process scrubbing tower 5, chimney 6 and alkali lye feed system 7, the exhanst gas outlet of wet process scrubbing tower 5 passes through draught fan 8 and is connected with chimney 6, alkali lye feed system 7 passes through lye pump 9 and is connected with the upper end of wet process scrubbing tower 5, the liquid outlet of wet process scrubbing tower 5 passes through waste water pump 10 and is connected with the upper end of SDA tower 2, activated carbon injection pipe 3 is respectively through the flue gas export of pipeline and SDA tower 2 and the flue gas entry linkage of sack cleaner 4, the exhanst gas outlet of sack cleaner 4 passes through the flue gas entry linkage of pipeline and wet process scrubbing tower 5, quench tower 1, the lower extreme of SDA tower 2 and sack cleaner 4 is the lime-ash export, quench tower 1 has flue gas entry and exhanst gas outlet, the exhanst gas outlet of quench tower 1 passes through the flue gas entry linkage of pipeline and SDA tower 2.
In this embodiment, the hazardous waste includes medical waste, pesticide waste, waste organic solvent and organic solvent-containing waste, distillation residue, waste catalyst, etc., and the flue gas generated after the hazardous waste is incinerated is referred to as hazardous waste incineration flue gas for short.
In this embodiment, the wet deacidification wastewater generated after the alkali liquor enters the wet washing tower 5 for deacidification treatment is the salt-containing alkali liquor.
In the prior art, dilute alkali liquor provided by an alkali liquor supply system 7 respectively enters an SDA tower 2 and a wet washing tower 5, the dilute alkali liquor is continuously recycled in the wet washing tower and a circulating alkali liquor pool under the action of a circulating pump until salt is saturated, and then is sprayed back to a quenching tower 1, so that the use amount of the alkali liquor is greatly increased, and the salt caking and hardening conditions are easily caused on the inner wall of the quenching tower 1. In the embodiment, the prior art is improved, dilute alkali liquor prepared by an alkali liquor supply system 7 is conveyed to a wet washing tower 5 through an alkali liquor pump 9 to remove acid gas in flue gas entering the wet washing tower 5, the reacted unsaturated low-salt deacidification wastewater is directly conveyed to an SDA tower 2 through a wastewater pump 10, and the dilute alkali liquor is not continuously recycled in the wet washing tower 5 and a circulating alkali liquor pool. The alkali liquor conveying speed of the alkali liquor pump 9 and the waste water conveying speed of the waste water pump 10 after wet deacidification depend on the consumption speed of the wet deacidification waste water in the SDA tower 2, and the alkali liquor conveying speed and the waste water conveying speed can be specifically adjusted according to actual conditions by arranging a flow adjusting valve on a corresponding pipeline. The salt generated after the wet deacidification reaction and the salt in the wet deacidification wastewater are combined with hot flue gas entering the SDA tower 2 through a flue gas inlet through the SDA tower 2, water is evaporated, and the salt is collected and treated outside together with ash generated by the quenching tower 1 and the bag-type dust collector 4 in an ash form; the hazardous waste incineration flue gas is subjected to a flue gas purification process of a quench tower 1, a SDA tower 2, an activated carbon injection pipe 3, a bag-type dust remover 4 and a wet washing tower 5, and is discharged up to the standard from a draught fan 8 to a chimney 6.
Among the traditional technical scheme, flue gas after handling through the quench tower gets into the dry process pipeline, carries out lime and active carbon injection processing to the flue gas through the dry process pipeline, and after having adopted SDA tower 2 in this embodiment, through the wet process deacidification waste water (contain salt lye) that gets into SDA tower 2, get rid of the acid gas in the flue gas after, need not adopt traditional dry process pipeline again to spray lime, but the flue gas that SDA tower 2 came out gets into and removes dioxin in the active carbon injection pipe 3 and handles. The activated carbon injection pipe 3 in this embodiment is a dry pipeline without lime injection.
According to the embodiment, the hazardous waste incineration flue gas wet deacidification wastewater is used as SDA water, salt in the wet deacidification wastewater is combined with hot flue gas through the SDA tower 2, namely the wet deacidification wastewater containing alkali liquor reacts with acid gas in the SDA tower to achieve the purpose of deacidification, the using amount of fresh alkali liquor is reduced, the salt is converted into ash to be removed, and the desalting cost is saved; the clear water consumption of the SDA tower 2 is eliminated, the water cost is greatly reduced, the high-load operation of an evaporator and the high-pressure operation of sewage treatment caused by high-salinity wastewater treatment are reduced, and the sewage treatment cost is reduced; the method eliminates the salt hardening condition of the inner wall of the quenching tower 1 caused by the prior high-salt wet deacidification wastewater back-spray quenching tower technology, ensures the continuous and stable operation of an incineration system, and has good social benefit, environmental benefit and economic benefit.
Wherein, alkali lye supply system 7 is including dense alkali jar 71, agitator tank 72 and the dilute alkali jar 73 that connects gradually, and dilute alkali jar 73 is connected with wet scrubbing tower 5 through lye pump 9, and agitator tank 72 is connected with water supply system. Concentration in the concentrated alkali tank 71Conveying the alkali liquor into a stirring tank 72, adding water, mixing and stirring uniformly to form dilute alkali liquor, conveying the dilute alkali liquor into a dilute alkali tank 73, and conveying the dilute alkali liquor into a wet washing tower 5 through an alkali liquor pump 9 to perform deacidification treatment on the flue gas. In practical cases, the acidic components (HCl, HF, SO) in the flue gas can be used 2 、SO 3 Etc.) content of the dilute alkali liquor, and details are not repeated.
In the traditional technical scheme, the alkali liquor supply system 7 further comprises an alkali liquor circulating pool and a circulating pump, dilute alkali liquor is continuously and circularly used in a wet scrubbing tower (also called a wet deacidification tower) and a circulating alkali liquor pool until salt is saturated to form high-salt wastewater back spray, the salt hardening condition of the inner wall of the quenching tower can be caused by the contact of the dilute alkali liquor and high-temperature flue gas entering the quenching tower, and an expensive salt inhibitor is required to be added to prevent the salt hardening condition of the inner wall of the quenching tower.
In this embodiment, the SDA tower 2 includes a tower body 21, a rotary atomizer 22 installed at the upper end of the tower body 21, and a flue gas distributor 23 installed in the tower body 21 and adjacent to the rotary atomizer 22, the wastewater pump 10 is connected to the rotary atomizer 22 through a pipeline, and the tower body 21 is provided with a flue gas inlet.
Wherein the flue gas inlet of the tower body 21 is adjacent to the spray opening of the rotary atomizer 22.
It should be understood that the above-described embodiments are only preferred embodiments of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that various modifications, equivalents, changes, and the like can be made to the present invention. However, these modifications should be within the scope of the present invention as long as they do not depart from the spirit of the present invention. In addition, certain terms used in the specification and claims of the present application are not limiting, but are used merely for convenience of description.
Claims (4)
1. The utility model provides a dangerous useless flue gas wet process deacidification waste water SDA retrieval and utilization processing system that burns which characterized in that includes: quench tower, SDA tower, sack cleaner, wet process scrubbing tower, chimney and alkali lye feed system, the exhanst gas outlet of wet process scrubbing tower pass through the draught fan with the chimney is connected, alkali lye feed system pass through the lye pump with the upper end of wet process scrubbing tower is connected, the liquid outlet of wet process scrubbing tower passes through the waste water pump and is connected with the upper end of SDA tower, the active carbon injection pipe respectively through the pipeline with the exhanst gas outlet of SDA tower with the flue gas entry linkage of sack cleaner, the exhanst gas outlet of sack cleaner pass through the pipeline with the flue gas entry linkage of wet process scrubbing tower, quench tower, SDA tower with the lower extreme of sack cleaner is the lime-ash export, the quench tower has a flue gas entry and exhanst gas outlet, the exhanst gas outlet of quench tower pass through the pipeline with the flue gas entry linkage of SDA tower.
2. The SDA recycling treatment system for hazardous waste incineration flue gas wet deacidification wastewater according to claim 1, wherein the alkali liquor supply system comprises a concentrated alkali tank, an agitator tank and a diluted alkali tank which are sequentially connected, the diluted alkali tank is connected with the wet washing tower through the alkali liquor pump, and the agitator tank is connected with a water supply system.
3. The SDA recycling system for hazardous waste incineration flue gas wet deacidification wastewater as claimed in claim 1, wherein the SDA tower comprises a tower body, a rotary atomizer mounted at the upper end of the tower body and a flue gas distributor mounted in the tower body and adjacent to the rotary atomizer, the wastewater pump is connected with the rotary atomizer through a pipeline, and the tower body is provided with a flue gas inlet.
4. The SDA recycling treatment system for hazardous waste incineration flue gas wet deacidification wastewater as claimed in claim 3, wherein the flue gas inlet of the tower body is adjacent to the spray nozzle of the rotary atomizer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222148037.1U CN218339421U (en) | 2022-08-16 | 2022-08-16 | SDA recycling treatment system for hazardous waste incineration flue gas wet deacidification wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222148037.1U CN218339421U (en) | 2022-08-16 | 2022-08-16 | SDA recycling treatment system for hazardous waste incineration flue gas wet deacidification wastewater |
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| CN218339421U true CN218339421U (en) | 2023-01-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117771924A (en) * | 2024-01-11 | 2024-03-29 | 光大绿色环保固废处置(南通)有限公司 | Deacidification tank and process based on wet deacidification of hazardous waste incineration flue gas |
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2022
- 2022-08-16 CN CN202222148037.1U patent/CN218339421U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117771924A (en) * | 2024-01-11 | 2024-03-29 | 光大绿色环保固废处置(南通)有限公司 | Deacidification tank and process based on wet deacidification of hazardous waste incineration flue gas |
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