CN210905610U - Coal slurry boiler flue gas desulfurization system - Google Patents
Coal slurry boiler flue gas desulfurization system Download PDFInfo
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- CN210905610U CN210905610U CN201921630452.2U CN201921630452U CN210905610U CN 210905610 U CN210905610 U CN 210905610U CN 201921630452 U CN201921630452 U CN 201921630452U CN 210905610 U CN210905610 U CN 210905610U
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Abstract
The utility model relates to a coal water slurry boiler flue gas desulfurization system, which comprises a bag-type dust remover, a dust removal desulfurization tower, a desulfurizer regeneration system and a desulfurization slag discharging system, wherein the top of the dust removal desulfurization tower is provided with a demister, so that the problem of larger water supplement amount of desulfurization liquid caused by entrainment of a large amount of water in flue gas is avoided; the desulfurizing agent regeneration system and the desulfurizing slag discharging system treat desulfurizing liquid after desulfurization and dust removal, and regenerated alkali liquor is recycled, so that the problem that the desulfurizing liquid is saturated in salt such as sulfate in water due to long-time operation, and a desulfurizing pipeline and a pump body are frequently crystallized and blocked is solved.
Description
Technical Field
The utility model relates to a chemical industry technical field, concretely relates to coal slurry boiler flue gas desulfurization 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 flue gas of the existing water-coal slurry boiler passes through a bag-type dust remover and then enters a reverse spraying dust removal desulfurization tower for desulfurization treatment, and after the desulfurization liquid in the dust removal 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 desulfurization pipelines, pump body crystallization blockage are often caused, and negative effects are caused on production and environmental protection.
Disclosure of Invention
An object of the utility model is to provide a coal slurry boiler flue gas desulfurization system solves the problem that current doctor solution salinity saturation easily crystallizes, the flue gas water content is big.
The utility model adopts the following technical scheme:
a coal water slurry boiler flue gas desulfurization system comprises a bag-type dust remover, a dust removal desulfurization tower, a desulfurizer regeneration system and a desulfurization slag discharging system;
the inlet of the bag-type dust remover is connected to the flue gas outlet of the coal water slurry boiler, the outlet of the bag-type dust remover is connected to the flue gas inlet of the dedusting and desulfurizing tower, the dedusting and desulfurizing tower is provided with a flue gas outlet, a desulfurizing liquid inlet and a desulfurizing liquid outlet, and the top of the dedusting and desulfurizing tower is provided with a demister;
the desulfurizing agent 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, wherein a desulfurizing liquid outlet is connected to the first sedimentation tank, and the circulation tank is connected to a desulfurizing liquid inlet; a discharge hole of the lime powder bin is connected to an oxidation regeneration tank;
the desulfurization slag discharging system comprises a filter press, the oxidation regeneration tank is connected to the filter press, and a filtrate outlet of the filter press is connected to the circulating tank.
Furthermore, the dedusting and desulfurizing tower comprises three spraying layers, a standby spraying layer and a desulfurizing liquid main pipe, wherein each spraying layer comprises a spraying pipe and a nozzle, the nozzles are connected with the spraying pipe in a threaded manner, and the spraying pipes are connected with the desulfurizing liquid main pipe through sleeve flanges.
Further, the nozzle is made of 316L stainless steel.
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.
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.
Further, the height of the dedusting and desulfurizing tower is at least 16 meters.
Compared with the prior art, the invention has the following technical effects:
the utility model provides a coal water slurry boiler flue gas desulfurization system, the top of a dust removal desulfurization tower is provided with a demister, which recovers the moisture carried away by the flue gas, lightens the water replenishing pressure of the circulating desulfurization liquid and reduces the water consumption; the utility model discloses increased desulfurizer regeneration system and desulfurization sediment discharge system, handled the desulfurization liquid after the desulfurization is removed dust, can carry out recycle to the salinity in the desulfurization liquid, avoid the saturated problem that causes desulfurization pipeline, pump body crystallization to block up of salinity such as aquatic sulphate, and regenerated out alkali lye circulation and use, reduced liquid alkali and put into dosage, reduced manufacturing cost.
The utility model controls the height of the desulfurizing tower, ensures the reaction time of the desulfurizing liquid and the flue gas, and leads the flue gas to be 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 view of a flue gas desulfurization system of a water-coal-slurry boiler of the present invention;
FIG. 2 is an internal structure view of the dust-removing desulfurization tower.
The reference numbers in the drawings are as follows: 1 is lime powder feed bin, 2 is the sack cleaner, 3 is the dust removal desulfurizing tower, 4 is first sedimentation tank, 5 is the oxidation regeneration pond, 6 is the second sedimentation tank, 7 is the third sedimentation tank, 8 is the circulation pond, 9 is the pressure filter, 31 is the shower, 32 is the defroster, 33 is the nozzle.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
As shown in fig. 1-2, a flue gas desulfurization system of a water-coal-slurry boiler comprises a bag-type dust remover 2, a dust removal desulfurization tower 3, a desulfurizer regeneration system and a desulfurization slag discharge system;
the inlet of the bag-type dust collector 2 is connected to the flue gas outlet of the water-coal-slurry boiler, the outlet of the bag-type dust collector is connected to the flue gas inlet of the dedusting and desulfurizing tower 3, the dedusting and desulfurizing tower 3 is also provided with a flue gas outlet, a desulfurizing liquid inlet and a desulfurizing liquid outlet, and the top of the dedusting and desulfurizing tower 3 is provided with a demister 32;
the desulfurizer regeneration system comprises a lime powder bin 1, and a first sedimentation tank 4, an oxidation regeneration tank 5, a second sedimentation tank 6, a third sedimentation tank 7 and a circulation tank 8 which are connected in sequence, wherein a desulfurization liquid outlet is connected to the first sedimentation tank 4, and the circulation tank 8 is connected to a desulfurization liquid inlet; a discharge hole of the lime powder bin 1 is connected to an oxidation regeneration tank 5; liquid caustic soda is introduced into the first sedimentation tank 4 and used for adjusting the pH value of the desulfurization solution, the oxidation regeneration tank 5 is a reaction place of lime and sulfate, the second sedimentation tank 6 and the third sedimentation tank 7 are used for fully precipitating precipitates generated by reaction, the circulating tank 8 is used for storing precipitated clear liquid for desulfurization recycling, and a stirrer is arranged in each tank.
The desulfurization slag discharging system comprises a filter press 9, the oxidation regeneration tank 5 is connected to the filter press 9, and a filtrate outlet of the filter press 9 is connected to the circulating tank 8. The filtrate outlet of the filter press 9 is connected to the circulating tank 8, and the desulfurized slag is sent out of the system.
As an implementation mode, the dedusting and desulfurizing tower 3 comprises three spraying layers, a standby spraying layer and a desulfurizing liquid main pipe, wherein each spraying layer comprises a spraying pipe 31 and a nozzle 33, the nozzle 33 is in threaded connection with the spraying pipe 31, the spraying pipe 31 and the desulfurizing liquid main pipe are connected through a sleeve flange, the sleeve flange is connected through a flange, only the spraying pipe 31 penetrates through the caliber of the flange, and the design is convenient for maintenance, disassembly, cleaning, dredging and replacement. 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 31 is parallel with lower floor's shower 31, 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
In one embodiment, the nozzle 33 is made of 316L stainless steel, which avoids rapid wear, fouling and clogging.
As an embodiment, the dedusting and desulfurizing tower 3 is provided with at least two circulating pumps, the circulating pumps are arranged on a connecting line of the circulating pool 8 and a desulfurizing liquid inlet, one circulating pump is arranged on one tower, the other circulating pump is arranged on one tower, the desulfurizing liquid is repeatedly circulated by the circulating pumps to contact with flue gas during operation, and the utilization rate of the desulfurizing agent is high.
As an embodiment, the demister 32 is a two-stage: the upper part and the lower part of the lower demister are respectively provided with a spraying layer, the lower part of the upper demister is provided with a spraying layer, and the washing water of the demister 32 and the water in the captured flue gas enter the oxidation regeneration tank 5 through self-flowing for recycling. The hot flue gas enters the dedusting and desulfurizing tower 3, is cooled after reacting with the desulfurizing liquid, and then continuously flows through the two-stage demister 32 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 lower part of higher level's defroster arranges one deck and sprays the layer, passes higher level's defroster after, through the gas outlet of dust removal desulfurizing tower flue gas through washing and purification to the dehydration bucket after the evacuation of chimney.
As an embodiment, the height of the dedusting and desulfurizing tower 3 is at least 16 meters, and the reaction time of the flue gas and the desulfurizing liquid is sufficiently ensured.
The operation process of the flue gas desulfurization system of the water-coal-slurry boiler is as follows:
the flue gas of the water-coal-slurry boiler enters a bag-type dust remover 2 and then enters a dust-removing desulfurizing tower 3, and the hot flue gas contacts with desulfurizing liquid (three spraying layers) from top to bottom to generate chemical absorptionReacting, cooling, absorbing and purifying sulfur dioxide and smoke dust in the flue gas by desulfurization solution, spraying the desulfurization solution from multiple spray nozzles 33 on each spray layer, and absorbing Sulfur Oxide (SO) from the flue gasX) And other acidic substances, demisting the desulfurized flue gas by a two-stage demister at the top in the desulfurizing tower, then emptying the flue gas from a flue gas outlet, and allowing the desulfurization liquid reacted with the flue gas to enter a first sedimentation tank 4 of a desulfurizing agent regeneration system. When the flue gas passes through the dust removal and desulfurization tower 3, the water in the dust removal and desulfurization tower 3 and the desulfurization reaction product brought away by the evaporated and taken away water will cause the solid concentration of the desulfurization solution to increase, and the water lost by the desulfurization solution will be supplemented by the washing water of the demister 32.
Enabling the desulfurization solution to enter a desulfurizer regeneration system: the desulfurization solution enters a first sedimentation tank 4 from a dedusting and desulfurizing tower 3, liquid caustic soda is added, the pH value of the desulfurization solution is adjusted to 8-9, then the desulfurization solution flows into an oxidation regeneration tank 5, the lime powder (containing CaO 85%) conveyed from outside is conveyed to a lime powder bin 1 through pneumatic power, a material level meter is arranged in the lime powder bin 1, the lime in the lime powder bin 1 is conveyed to a star-shaped feeder through a blanking machine, and the star-shaped feeder is conveyed to the oxidation regeneration tank 5. Lime powder and the doctor solution entering the oxidation regeneration tank 5 are fully reacted under the stirring of a stirrer to generate NaOH and calcium sulfite, air is introduced into the oxidation regeneration tank 5 by an oxidation fan to oxidize the calcium sulfite of the slurry into calcium sulfate, the regenerated NaOH alkali liquor flows into a second sedimentation tank 6 and a third sedimentation tank 7 by utilizing potential difference, the regenerated NaOH alkali liquor automatically flows into a circulation tank 8 after being precipitated for recycling, the doctor solution in the circulation tank 8 is sent to a dedusting and desulfurizing tower 3 by a circulation pump for recycling, the circulation tank 8 keeps a certain liquid level, and production water is added for supplementing when the liquid level is not enough, as part of the alkali liquor can be taken out when the slag is treated, a certain amount of alkali liquor is added after the slag is treated to stabilize the pH value.
A desulfurized slag discharging system: calcium sulfate generated in the oxidation regeneration tank 5 is pumped into a filter press 9 by a slag pump for filter pressing, the desulfurized slag after filter pressing is transported outside for treatment, and the filtrate flows back to a circulation tank 8 for recycling.
The above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and it is obvious to those skilled in the art that other embodiments can be easily made by replacing or changing the technical content disclosed in the present specification, so that all the changes and modifications made by the principles and process conditions of the present invention should be included in the claims of the present invention.
Claims (6)
1. A coal water slurry boiler flue gas desulfurization system comprises a bag-type dust remover (2) and a dust removal desulfurization tower (3), and is characterized by also comprising a desulfurizer regeneration system and a desulfurization slag discharging system;
the inlet of the bag-type dust collector (2) is connected to the flue gas outlet of the water-coal slurry boiler, the outlet of the bag-type dust collector is connected to the flue gas inlet of the dedusting and desulfurizing tower (3), the dedusting and desulfurizing tower (3) is also provided with a flue gas outlet, a desulfurizing liquid inlet and a desulfurizing liquid outlet, and the top of the dedusting and desulfurizing tower (3) is provided with a demister (32);
the desulfurizer regeneration system comprises a lime powder bin (1), and a first sedimentation tank (4), an oxidation regeneration tank (5), a second sedimentation tank (6), a third sedimentation tank (7) and a circulation tank (8) which are connected in sequence, wherein a desulfurization solution outlet is connected to the first sedimentation tank (4), and the circulation tank (8) is connected to a desulfurization solution inlet; a discharge hole of the lime powder bin (1) is connected to an oxidation regeneration pool (5);
the desulfurization slag discharging system comprises a filter press (9), the oxidation regeneration tank (5) is connected to the filter press (9), and a filtrate outlet of the filter press (9) is connected to the circulating tank (8).
2. The coal-water slurry boiler flue gas desulfurization system according to claim 1, wherein the dedusting and desulfurization tower (3) comprises three spraying layers, a spare spraying layer and a main desulfurization liquid pipe, each spraying layer comprises a spraying pipe (31) and a nozzle (33), the nozzle (33) is in threaded connection with the spraying pipe (31), and the spraying pipe (31) is connected with the main desulfurization liquid pipe through a sleeve flange.
3. The flue gas desulfurization system of the water-coal-slurry boiler according to claim 2, wherein said nozzle (33) is a nozzle (33) made of 316L stainless steel.
4. The desulfurization system for coal-water slurry boiler flue gas according to claim 1, wherein the dedusting and desulfurization tower (3) is equipped with at least two circulating pumps, and the circulating pumps are arranged on a connecting line of the circulating tank (8) and the desulfurization solution inlet.
5. The flue gas desulfurization system of the water-coal-slurry boiler according to claim 1, characterized in that the demister (32) 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.
6. The coal-water slurry boiler flue gas desulfurization system according to claim 1, characterized in that the height of the dedusting and desulfurizing tower (3) is at least 16 meters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921630452.2U CN210905610U (en) | 2019-09-27 | 2019-09-27 | Coal slurry boiler flue gas desulfurization system |
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| CN201921630452.2U CN210905610U (en) | 2019-09-27 | 2019-09-27 | Coal slurry boiler flue gas desulfurization system |
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| CN210905610U true CN210905610U (en) | 2020-07-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112933905A (en) * | 2021-01-29 | 2021-06-11 | 乌海宝杰新能源材料有限公司 | Efficient and energy-saving graphitized tail gas treatment system and treatment process thereof |
| CN114381306A (en) * | 2022-01-19 | 2022-04-22 | 北京北科环境工程有限公司 | High-selectivity blast furnace gas fine desulfurization purification method |
| CN114618287A (en) * | 2022-02-22 | 2022-06-14 | 江苏天楹环保能源成套设备有限公司 | Supplementary deacidification replacement cyclic utilization system of flue gas |
| CN115055049A (en) * | 2022-07-30 | 2022-09-16 | 浙江振鑫新材料科技有限公司 | Flue gas treatment method in lime sintering process |
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2019
- 2019-09-27 CN CN201921630452.2U patent/CN210905610U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112933905A (en) * | 2021-01-29 | 2021-06-11 | 乌海宝杰新能源材料有限公司 | Efficient and energy-saving graphitized tail gas treatment system and treatment process thereof |
| CN114381306A (en) * | 2022-01-19 | 2022-04-22 | 北京北科环境工程有限公司 | High-selectivity blast furnace gas fine desulfurization purification method |
| CN114381306B (en) * | 2022-01-19 | 2022-10-14 | 北京北科环境工程有限公司 | High-selectivity blast furnace gas fine desulfurization purification method |
| CN114618287A (en) * | 2022-02-22 | 2022-06-14 | 江苏天楹环保能源成套设备有限公司 | Supplementary deacidification replacement cyclic utilization system of flue gas |
| CN115055049A (en) * | 2022-07-30 | 2022-09-16 | 浙江振鑫新材料科技有限公司 | Flue gas treatment method in lime sintering process |
| CN115055049B (en) * | 2022-07-30 | 2023-09-15 | 浙江振鑫新材料科技有限公司 | Flue gas treatment method in lime sintering process |
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