CN110613989A - Coal slurry boiler flue gas desulfurization and denitrification system - Google Patents
Coal slurry boiler flue gas desulfurization and denitrification system Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D2251/60—Inorganic bases or salts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention relates to a flue gas desulfurization and denitrification system of a water-coal-slurry boiler, which comprises the water-coal-slurry boiler, a denitrification reactor, a waste heat boiler, an air preheater, a dust remover and a desulfurization system; the flue gas outlet of the water-coal-slurry boiler is connected to the denitration reactor, and the denitration reactor, the waste heat boiler, the air preheater, the dust remover and the desulfurization system are sequentially connected. According to the method, the desulfurization efficiency is effectively improved, the number of carbon dioxide flowers is 150/Nm from the original flue gas data, the number of carbon dioxide flowers is reduced to 5/Nm, the number of the carbon dioxide flowers is reduced to 5/Nm or left and right from the original number of carbon dioxide flowers 25/Nm, the content of nitrogen oxides in the flue gas is effectively reduced through a denitration reactor, the number of carbon dioxide flowers is reduced to 10/Nm or left and right from the original number of carbon dioxide flowers 200/Nm, and the method is more environment-friendly.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a coal water slurry boiler flue gas desulfurization and denitrification system.
Background
With the increasing environmental and energy problems, the national requirements for environmental protection are increasing, and the coal water slurry is a novel oil-coal-based fluid fuel, and is obtained by physically processing about 65% of coal, 34% of water and 1% of additives, and is used as a boiler fuel because of low pollution, high efficiency, energy conservation and pipeline transportation. By adopting the new clean coal technology, the heat efficiency of the boiler is improved, the environmental pollution is reduced, and the economic benefit and the environmental benefit are obvious.
The ammonia water that current water coal slurry boiler SCR deNOx systems adopted is the ammonia water that concentration is greater than 10%, and the ammonia water flow is on the small side, but the ammonia water is because the concentration is high easily causes ammonia to escape and influences the surrounding environment, and the ammonia water flow is little simultaneously can lead to ammonia water and flue gas contact insufficient, leads to the reaction of taking off the round pin incomplete, influences the efficiency of taking off the round pin. The flue gas of the existing water-coal slurry boiler passes through a bag-type dust remover and then enters a dust removal desulfurization tower for desulfurization treatment, and after the desulfurization liquid in the desulfurization tower and high-temperature flue gas carry out convective reaction, more moisture is carried in the flue gas, so that the water supplement amount of the desulfurization liquid is larger, and the desulfurization liquid is saturated due to long-time operation, so that the conditions of blockage of a desulfurization pipeline and a pump body by crystallization are often caused, and negative effects are caused on production and environmental protection. Chinese patent CN2065566684U discloses a coal water slurry boiler flue gas desulfurization device, including clean room, waste material room, draught fan and desulfurization room, this desulfurization liquid adopts industry waste lye, has certain economic nature, but can directly discharge after carrying out single desulfurization, can not recycle, unable used repeatedly.
Disclosure of Invention
The invention aims to provide a system for desulfurizing and denitrating flue gas of a water-coal-slurry boiler, which solves the problems that the flue gas of the existing water-coal-slurry boiler has high pollution components and the desulfurization solution can not be recycled.
The invention adopts the following technical scheme:
a coal water slurry boiler flue gas desulfurization and denitrification system comprises a coal water slurry boiler, a denitrification reactor, a waste heat boiler, an air preheater, a bag-type dust remover, a desulfurization system, a dehydration barrel and a chimney which are sequentially connected, wherein the waste heat boiler is connected with a soft water tank, and the desulfurization system comprises a dust removal desulfurization tower, a desulfurizer regeneration system and a desulfurization slag discharging system which are sequentially connected; the desulfurizer regeneration system comprises a lime powder bin and a first sedimentation tank, a second sedimentation tank, a third sedimentation tank and a circulation tank which are sequentially connected, and the desulfurization slag discharge system comprises a filter press.
Furthermore, an ammonia water injection system is arranged at an inlet of the denitration reactor, ammonia water with the concentration of 9% is used as a denitration reactant, a catalyst of the denitration reactor is a honeycomb type 18-hole catalyst, the components of the catalyst are vanadium-tungsten-titanium heavy metals, and an acoustic wave soot blower is arranged on the surface layer of the catalyst.
Further, air heater includes one-level air heater and second grade air heater through the pipe connection, second grade air heater sets up in exhaust-heat boiler's bottom, one-level air heater is connected with the air-blower.
Further, the dedusting and desulfurizing tower is at least 16 meters high, and the top of the dedusting and desulfurizing tower is provided with a demister; still be provided with the three-layer in the dust removal desulfurizing tower and spray the layer, the reserve layer that sprays of one deck and the doctor solution is responsible for, every layer spray the layer and include shower and nozzle, the nozzle is connected with the shower screw thread, and the shower is responsible for through the sleeve pipe flange with the doctor solution and is connected.
Further, the nozzle is made of 316L stainless steel.
Further, the demister is two-stage: the upper portion and the lower portion of the lower-level demister are respectively provided with a spraying layer, and the lower portion of the upper-level demister is provided with a spraying layer.
Furthermore, the first sedimentation tank is connected with a desulfurization solution outlet of the dedusting and desulfurization tower, the circulating tank is connected with a desulfurization solution inlet, and a discharge hole of the lime powder bin is connected to the oxidation regeneration tank.
Further, the oxidation regeneration tank is connected to a filter press, and a filtrate outlet of the filter press is connected to the circulation tank.
Furthermore, the dedusting and desulfurizing tower is provided with at least two circulating pumps, and the circulating pumps are arranged on a connecting pipeline between the circulating pool and the desulfurizing liquid inlet.
Compared with the prior art, the invention has the following technical effects:
1. the invention provides a coal slurry boiler flue gas desulfurization and denitration system, desulfurization efficiency is effectively improved, descend to 5 mg/Nm by original flue gas data sulfur dioxide content 150 Nm, simultaneously particulate matter content also descends to 5 mg/Nm and right and left by 25 Nm/Nm and thin year, effectively reduces flue gas nitrogen oxide content through denitration reactor, descends to 10 mg/Nm and right and left by 200 Nm and thin year, more environmental protection. The SCR denitration reactor selects ammonia water with the concentration of 9 percent, except that the ammonia water with the concentration does not belong to dangerous chemicals, the ammonia escape amount can be reduced, and after the ammonia spraying flow is increased, the ammonia water can be fully contacted with flue gas through atomization to carry out denitration reaction, so that the ammonia water utilization rate is increased, the ammonia escape amount can be reduced, and the environmental problems caused by the odor of the ammonia water of the reactor and the subsequent process are reduced.
2. The top of the dedusting and desulfurizing tower is provided with the demister, so that moisture carried away by flue gas is recovered, the water supplementing pressure of the circulating desulfurizing liquid is reduced, and the water consumption is reduced; according to the invention, a desulfurizer regeneration system and a desulfurization slag discharge system are added, the desulfurization solution after desulfurization and dust removal is treated, the salt in the desulfurization solution can be recycled, the problem of crystallization blockage of desulfurization pipelines and pump bodies caused by saturation of salt such as sulfate in water is avoided, and regenerated alkali liquor is recycled, so that the addition amount of liquid alkali is reduced, and the production cost is reduced.
3. The tower height of the desulfurizing tower is controlled, the reaction time of the desulfurizing liquid and the flue gas is ensured, and the flue gas is more fully contacted with the desulfurizing liquid through the three spraying layers; the reverse spray dedusting and desulfurizing tower is provided with at least two circulating pumps to ensure the circulating amount of the desulfurizing liquid in the desulfurizing tower; meanwhile, the added standby spraying layer can be used under the condition that nozzles of other spraying layers are blocked, and the blocked nozzles are cleaned on line.
Drawings
FIG. 1 is a schematic diagram of a flue gas desulfurization and denitrification system of a water-coal-slurry boiler.
FIG. 2 is a schematic diagram of a dedusting and desulfurizing tower of a flue gas desulfurization and denitrification system of a water-coal-slurry boiler.
The reference numbers in the drawings are as follows: 1 is the coal slurry boiler, 2 is the denitration reactor, 3 is exhaust-heat boiler, 4 is second grade air heater, 5 is one-level air heater, 6 is the sack cleaner, 7 is the dust removal desulfurizing tower, 8 is the dehydration bucket, 9 is the chimney, 10 is the lime powder feed bin, 11 is first sedimentation tank, 12 is the oxidation regeneration pond, 13 is the second sedimentation tank, 14 is the third sedimentation tank, 15 is the circulation pond, 16 is the pressure filter, 17 is the soft water tank, 71 is the shower, 72 is the defroster, 73 is the nozzle.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
A coal water slurry boiler flue gas desulfurization and denitrification system is shown in figures 1-2 and comprises a coal water slurry boiler 1, a denitrification reactor 2, an exhaust-heat boiler 3, an air preheater, a bag-type dust remover 6, a desulfurization system, a dehydration barrel 8 and a chimney 9 which are connected in sequence, wherein the exhaust-heat boiler 3 is connected with a soft water tank 17, and the desulfurization system comprises a dedusting and desulfurization tower 7, a desulfurizer regeneration system and a desulfurization slag discharge system which are connected in sequence; the desulfurizer regeneration system comprises a lime powder bin 10 and comprises a lime powder bin 10, a first sedimentation tank 11, an oxidation regeneration tank 12, a second sedimentation tank 13, a third sedimentation tank 14 and a circulation tank 15 which are sequentially connected, and the desulfurization slag discharge system comprises a filter press 16.
In one embodiment, the denitration reactor 2 is vertical, the material is Q345, and an airtight device is installed at the bottom of the denitration reactor 2 to prevent leakage of untreated flue gas. Meanwhile, manholes with enough size and quantity are formed in the denitration reactor 2, and enough space is formed between the surface layer of the catalyst and the upper catalyst supporting steel beam, so that the denitration reactor is convenient to maintain; the entrance of denitration reactor 2 is equipped with aqueous ammonia injection system, adopts concentration to be 9% aqueous ammonia as the denitration reactant, except that this concentration aqueous ammonia does not belong to dangerous chemicals, can reduce ammonia escape volume, spout the ammonia flow simultaneously and improve the back, through atomizing, the aqueous ammonia can fully contact with the flue gas, carries out the denitration reaction, improves the aqueous ammonia utilization ratio, can reduce ammonia escape volume equally, reduces the environmental problem that the aqueous ammonia peculiar smell of reactor and follow-up technology leads to. The catalyst of the denitration reactor 2 is a honeycomb type 18-hole catalyst, the flue gas temperature of the system is low, the catalyst is honeycomb type and can meet the requirement of long-term operation under the condition that the flue gas temperature is 300-389 ℃, and the catalyst adopts a vanadium-tungsten-titanium heavy metal catalyst as a component and has good oxidation-reduction performance and alkali metal poisoning resistance; the surface layer of the catalyst is provided with the acoustic wave soot blower, a matched valve, a pipeline system, a control device and the like, and the soot blower is controlled by a DCS (distributed control system), so that the blockage of the catalyst honeycomb caused by the accumulation of soot amount in flue gas can be prevented, and the unsmooth circulation of the flue gas can be prevented.
As an implementation mode, the air heater includes one-level air heater 5 and second grade air heater 4 through the pipe connection, second grade air heater 4 sets up in exhaust-heat boiler 3's bottom, one-level air heater 5 is connected with the air-blower, and two air heaters improve the air-blower and advance stove combustion air temperature, reduce the energy consumption.
As an embodiment, the height of the dedusting and desulfurizing tower 7 is at least 16 meters, so as to fully ensure the reaction time of the flue gas and the desulfurizing liquid, and the top of the dedusting and desulfurizing tower is provided with a demister 72; still be provided with three-layer in the dust removal desulfurizing tower 7 and spray the layer, the reserve layer of spraying of one deck and the doctor solution is responsible for, every layer spray the layer and include shower 71 and nozzle 73, nozzle 73 is connected with shower 71 screw thread, and shower 71 is responsible for through the sleeve pipe flange with the doctor solution and is connected. The sleeve flange connection is one of flange connection, and only the spray pipe 71 penetrates into the caliber of the flange, so that the design is convenient to overhaul, disassemble, clean, dredge and replace. Reserve spraying layer sets up and is increasing section bottom more than 250mm, plays standby state when dredging, clearing up all the other spray set, reserve spraying layer's shower 71 is parallel with lower floor's shower 71, and reserve spraying layer clockwise rotation 15, makes reserve spraying layer more even with other spraying layer doctor solution spray regime, reaches the effect of full coverage. The nozzle 73 is a nozzle 73 made of 316L stainless steel.
As an embodiment, the demister 72 is a two-stage: the upper side and the lower side of the lower demister are respectively provided with a spraying layer, the lower side of the upper demister is provided with a spraying layer, and washing water of the demister 72 and water in captured flue gas enter a regeneration tank through self-flowing for recycling. The hot flue gas enters the dedusting and desulfurizing tower 7, is cooled after reacting with the desulfurizing liquid, and then continuously flows through the two-stage demister 72 to remove contained fog drops. The upper and lower sides of the lower demister are respectively provided with a layer of spraying layer, spraying of cleaning water takes away solid particles on the downstream surface and the upstream surface of the lower demister, and flue gas enters the upper demister after passing through the lower demister. The one deck layer of spraying is arranged to the below of higher level's defroster, passes higher level's defroster after, and the flue gas through washing and purification is carried out the evacuation through chimney 9 after dehydration again after passing flue gas outlet to dehydration bucket 8 of dust removal desulfurizing tower 7.
As an embodiment, a desulfurization solution outlet of the dust removal desulfurization tower 7 and an outlet of the dehydration barrel 8 are connected to a first sedimentation tank 11, a circulation tank 15 is connected to a desulfurization solution inlet, a discharge port of the lime powder bin 10 is connected to an oxidation regeneration tank 12, caustic soda liquid is introduced into the first sedimentation tank 11 to adjust the pH of the desulfurization solution, the oxidation regeneration tank 12 is a reaction place of lime and sulfate, a second sedimentation tank 13 and a third sedimentation tank 14 are used for fully precipitating precipitates generated by reaction, the circulation tank 15 is used for storing precipitated clear liquid for desulfurization circulation, and a stirrer is arranged in each tank.
In one embodiment, one end of the oxidation regeneration tank 12 is connected to the filter press 16, and the filtrate outlet of the filter press 16 is connected to the circulation tank 15.
In one embodiment, the dust-removing desulfurization tower 7 is equipped with at least two circulating pumps, and the circulating pumps are arranged on a connecting line between the circulating tank 15 and the desulfurization solution inlet.
The working process of the invention is as follows:
a flue gas outlet of the coal water slurry boiler 1 is connected to the denitration reactor 2, an ammonia water injection system is arranged at a flue gas inlet of the denitration reactor 2, and the ammonia water and the flue gas are uniformly mixed by the injection system in an ammonia injection spray gun mode; the flue gas after the denitration reaction sequentially enters a waste heat boiler 3 and an air preheater to recover heat, part of the recovered heat is sent to a coal water slurry boiler 1 for circulation, part of the recovered heat is used by a stripping tower, and the rest heat is discharged; the cooled hot flue gas enters a bag-type dust collector 6 for dust removal, dry ash is conveyed to the outside of the system, the flue gas enters a dust removal and desulfurization tower 7 of a desulfurization system, the hot flue gas is contacted with desulfurization liquid (three spraying layers) from top to bottom to generate chemical absorption reaction and is cooled, sulfur dioxide and smoke dust in the flue gas are absorbed and purified by the desulfurization liquid, the desulfurization liquid is sprayed out by a plurality of nozzle layers of each spraying layer, and the desulfurization liquid absorbs Sulfur Oxide (SO) from the flue gasX) Andand (3) demisting the desulfurized flue gas by using a two-stage demister 72 at the top in the desulfurizing tower, exhausting the desulfurized flue gas from a flue gas outlet, and allowing the desulfurized liquid reacted with the flue gas to enter a first sedimentation tank 11 of a desulfurizing agent regeneration system. When the flue gas passes through the dust removal and desulfurization tower 7, the moisture in the dust removal and desulfurization tower 7 and the desulfurization reaction products which are evaporated and taken away carry out water, so that the solid concentration of the desulfurization solution is increased, and the water lost by the desulfurization solution is supplemented by flushing water of a demister 72.
Enabling the desulfurization solution to enter a desulfurizer regeneration system: the desulfurization solution enters a first sedimentation tank 11 from a dedusting and desulfurization tower 7, liquid caustic soda is added, the pH of the desulfurization solution is adjusted to 8-9, then the desulfurization solution flows into an oxidation regeneration tank 12, the lime powder (containing CaO 85%) conveyed from outside is conveyed to a lime powder bin 10 through pneumatic power, a material level meter is arranged in the lime powder bin 10, the lime in the lime powder bin 10 is conveyed to a star-shaped feeder through a blanking machine, and the star-shaped feeder is conveyed to the oxidation regeneration tank 12. Lime powder and the doctor solution entering the oxidation regeneration tank 12 are fully reacted under the stirring of a stirrer to generate NaOH and calcium sulfite, air is introduced into the oxidation regeneration tank 12 by an oxidation fan to oxidize the calcium sulfite of the slurry into calcium sulfate, the regenerated NaOH alkali solution flows into a second sedimentation tank 13 and a third sedimentation tank 14 by using potential difference, the regenerated NaOH alkali solution automatically flows into a circulation tank 15 after sedimentation for recycling, the doctor solution in the circulation tank 15 is sent to a dedusting and desulfurizing tower 7 by a circulation pump for recycling, the circulation tank 15 keeps a certain liquid level, and process water is added for supplement when the liquid level is not enough, as part of the alkali solution is taken out when the slag is treated, a certain amount of alkali solution is added after the slag is treated to improve the pH value.
A desulfurized slag discharging system: calcium sulfate generated in the oxidation regeneration tank 12 is pumped into a filter press 16 by a slag pump for filter pressing, the desulfurized slag after filter pressing is transported outside for treatment, and the filtrate flows back to the circulation tank 15 for recycling.
According to the coal water slurry boiler flue gas after desulfurization and denitrification, the sulfur dioxide content in the original flue gas data is 150 mg/Nm and is reduced to 5 mg/Nm, and simultaneously the particulate matter content is also reduced to 5 mg/Nm and about top-year-.
The above-mentioned embodiments are merely preferred embodiments of the present invention, which are merely illustrative and not restrictive, and it should be understood that other embodiments may be easily implemented by those skilled in the art by means of replacement or modification according to the technical contents disclosed in the specification, and therefore, all changes and modifications that come within the spirit and technical conditions of the present invention should be included in the claims of the present invention.
Claims (9)
1. The flue gas desulfurization and denitrification system of the water-coal-slurry boiler is characterized by comprising a water-coal-slurry boiler (1), a denitrification reactor (2), an exhaust-heat boiler (3), an air preheater, a bag-type dust remover (6), a desulfurization system, a dehydration barrel (8) and a chimney (9) which are sequentially connected, wherein the exhaust-heat boiler (3) is connected with a soft water tank (17), and the desulfurization system comprises a dedusting and desulfurization tower (7), a desulfurizer regeneration system and a desulfurization slag discharge system which are sequentially connected; the desulfurizer regeneration system comprises a lime powder bin (10), and a first sedimentation tank (11), an oxidation regeneration tank (12), a second sedimentation tank (13), a third sedimentation tank (14) and a circulation tank (15) which are sequentially connected, and the desulfurization slag discharge system comprises a filter press (16).
2. The water-coal-slurry boiler flue gas desulfurization and denitrification system according to claim 1, wherein an ammonia water injection system is arranged at an inlet of the denitrification reactor (2), ammonia water with the concentration of 9% is used as a denitrification reactant, a catalyst of the denitrification reactor (2) is a honeycomb type 18-hole catalyst, the components of the catalyst are vanadium-tungsten-titanium heavy metals, and a sound wave soot blower is arranged on the surface layer of the catalyst.
3. The system for desulfurizing and denitrating the flue gas of the water-coal-slurry boiler according to claim 1, wherein the air preheater comprises a primary air preheater (5) and a secondary air preheater (4) which are connected through a pipeline, the secondary air preheater (4) is arranged at the bottom of the waste heat boiler (3), and the primary air preheater (5) is connected with an air blower.
4. The system for desulfurizing and denitrifying the flue gas of the water-coal-slurry boiler according to the claim 1, characterized in that the dedusting and desulfurizing tower (7) is at least 16 meters high and provided with a demister (72) at the top; still be provided with the three-layer in dust removal desulfurizing tower (7) and spray the layer, the reserve layer of spraying of one deck and the doctor solution is responsible for, every layer spray the layer and include shower (71) and nozzle (73), nozzle (73) are connected with shower (71) screw thread, and shower (71) are responsible for through the sleeve pipe flange with the doctor solution and are connected.
5. The system for desulfurizing and denitrifying the flue gas of a water-coal-slurry boiler according to claim 4, characterized in that the nozzle (73) is made of 316L stainless steel (73).
6. The system for desulfurizing and denitrifying the flue gas of the water-coal-slurry boiler according to claim 4, wherein the demister (72) is two-stage: the upper portion and the lower portion of the lower-level demister are respectively provided with a spraying layer, and the lower portion of the upper-level demister is provided with a spraying layer.
7. The system for desulfurizing and denitrifying the flue gas of the water-coal-slurry boiler according to the claim 1, characterized in that the first sedimentation tank (11) is connected with the outlet of the desulfurization solution of the dedusting and desulfurizing tower (7), the circulation tank (15) is connected with the inlet of the desulfurization solution, and the discharge hole of the lime powder bin (10) is connected to the oxidation regeneration tank (12).
8. The desulfurization and denitrification system for the flue gas of the water-coal-slurry boiler according to claim 1, wherein the oxidation regeneration tank (12) is connected to a filter press (16), and a filtrate outlet of the filter press (16) is connected to the circulation tank (15).
9. The system for desulfurizing and denitrifying the flue gas of a water-coal-slurry boiler according to claim 7, wherein the dedusting and desulfurizing tower (7) is provided with at least two circulating pumps, and the circulating pumps are arranged on a connecting pipeline between the circulating tank (15) and the desulfurizing liquid inlet.
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| CN201910925276.3A CN110613989A (en) | 2019-09-27 | 2019-09-27 | Coal slurry boiler flue gas desulfurization and denitrification system |
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| CN201910925276.3A CN110613989A (en) | 2019-09-27 | 2019-09-27 | Coal slurry boiler flue gas desulfurization and denitrification system |
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