CN113181758A - Gypsum wet flue gas desulfurization method and system - Google Patents
Gypsum wet flue gas desulfurization method and system Download PDFInfo
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- CN113181758A CN113181758A CN202110547464.4A CN202110547464A CN113181758A CN 113181758 A CN113181758 A CN 113181758A CN 202110547464 A CN202110547464 A CN 202110547464A CN 113181758 A CN113181758 A CN 113181758A
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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
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
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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
Abstract
The invention provides a gypsum wet flue gas desulfurization method and a system, comprising the following steps: preparing limestone into fine powder, and injecting water and stirring into a slurry; preparing lime slurry into an absorbent and sending the absorbent into a spraying layer of an absorption tower; adjusting the pH value of the lime slurry, and sending the lime slurry into a slurry pool of an absorption tower; the flue gas to be desulfurized enters an absorption tower, and an absorbent is sprayed on the flue gas to be desulfurized through a slurry distribution pipeline; detecting the content of calcium sulfate in the slurry tank; adjusting the air input of an oxidation fan and the opening of a lime milk pump according to the content of calcium sulfate; detecting the concentration of lime slurry entering the absorption tower, comparing the concentration with a standard value, and adjusting; and detecting the liquid level height of the slurry pool and adjusting. By adjusting the operation of the system, the desulfurization process can be stably operated, the quality of the gypsum can be effectively improved, and the purity of the gypsum is improved; through thick liquid concentration adjustment, can avoid the wearing and tearing and the jam of pipeline and pump, avoid the rotating equipment overload operation.
Description
Technical Field
The invention belongs to the technical field of desulfurization, and relates to a gypsum wet flue gas desulfurization method and a system.
Background
The flue gas after coal combustion is desulfurized, SO that SO can be effectively reduced2The discharge of the air purifier reduces the formation of acid rain, ensures the air quality, and creates a good environment for the work and the life of people, which is an engineering with important social significance. The efficiency of flue gas desulfurization is affected by many factors, including flue gas flow rate, SO2 concentration, liquid-to-gas ratio, slurry PH, flue gas temperature, and by the stability of the desulfurization systemInfluence.
The wet flue gas desulfurization technology is commonly used for boiler flue gas desulfurization of large-scale coal-fired thermal power plants, the wet flue gas desulfurization technology is positioned behind a dust removal system of a combustion boiler, the whole desulfurization process is carried out in solution, the used desulfurizing agent and desulfurization products are in a wet state, the temperature in desulfurization is low, and the flue gas can be discharged from a chimney after being heated. The existing wet flue gas desulfurization system has the disadvantages of low desulfurization efficiency, single desulfurization process flow and poor stability and adjustment effect.
Therefore, the invention provides a gypsum wet flue gas desulfurization method and a gypsum wet flue gas desulfurization system.
Disclosure of Invention
In order to solve the problems, the invention provides a gypsum wet flue gas desulfurization method and a gypsum wet flue gas desulfurization system.
In order to achieve the above purpose, the present invention provides the following technical solutions.
A gypsum wet flue gas desulfurization method comprises the following steps:
preparing limestone into a slurry; preparing lime slurry into an absorbent and feeding the absorbent into an absorption tower;
the flue gas to be desulfurized enters an absorption tower, and the absorbent is sprayed and desulfurized through a slurry distribution pipeline and discharged from the top of the absorption tower;
adjusting the Ph value of a slurry pool at the bottom of the absorption tower, wherein the Ph range is from.
Detecting the content of calcium sulfate in the slurry tank; and adjusting the air inflow of the oxidation fan and the opening of the lime milk pump according to the content of the calcium sulfate.
Preferably, the concentration of the lime slurry entering the absorption tower is detected and compared with a standard value, and when the concentration of the lime slurry is lower than the standard value, the flushing water quantity of the demister and the water inlet quantity of the absorption tower are reduced, the gypsum slurry pump is closed, and the vacuum belt dehydrator is suspended; when the concentration of the lime slurry is higher than the standard, the opening of the gypsum slurry pump is increased.
Preferably, the liquid level height of the slurry pool is detected; when the height of the slurry pool is higher than a preset value, the opening degree of a gypsum slurry pump is increased, and a flushing water door of a demister is closed; when the liquid level is lower than the standard, the buffer pump is opened to feed the gypsum slurry from the buffer tank to the slurry tank.
A gypsum wet flue gas desulfurization system comprising:
the absorption tower is internally provided with a demister, a spraying layer and a slurry tank from top to bottom in sequence; the spraying layer comprises a slurry distribution pipeline and a plurality of nozzles arranged on the slurry distribution pipeline;
the lime milk pool is communicated with the inlet of the slurry distribution pipeline through a pipeline and a lime milk pump;
the discharge flue is communicated with the top of the absorption tower;
the smoke inlet pipeline is communicated with the absorption tower and is arranged below the spraying layer; a heater is arranged between the absorption tower and the smoke discharge flue;
the oxidation fan is communicated with the slurry tank; and a second stirrer is erected above the inlet of the oxidation fan of the absorption tower.
Preferably, the device also comprises a powder making device; the powder preparation device comprises a crusher, a screening machine, a dryer, a pulverizer and a lime powder tank; the outlet of the crusher is communicated with the inlet of the screening machine through a pipeline, and the outlet of the screening machine is communicated with the dryer; the screening machine is communicated with a process water system; the dryer is communicated with the pulverizer, and the pulverizer is communicated with the lime powder tank through a pipeline; the lime powder tank is communicated with the lime milk pool through a screw feeder; a first stirrer is erected above the lime milk pool, the bottom of the lime milk pool is communicated with a slag discharge pump through a pipeline, and the top of the lime milk pool is communicated with the process water system.
Preferably, the device also comprises a recovery device; the recovery device comprises a hydrocyclone; the bottom of the absorption tower is communicated with the inlet of the hydrocyclone through a pipeline and a gypsum slurry pump, and the outlet of the hydrocyclone is communicated with a vacuum belt dehydrator through a pipeline; and the water discharge pipes of the hydraulic cyclone and the vacuum belt dehydrator are communicated with the bottom of the absorption tower through a pipeline and a water return pump.
Preferably, a slurry supplement pump is also included; and the inlet and the outlet of the slurry supplementing pump are respectively communicated with the slurry pool and the slurry distribution pipeline through pipelines.
Preferably, a vulcanizing fan and a fluidization plate are erected at the bottom of the lime powder tank.
Preferably, also include the chimney; the discharge flue is communicated with the chimney through a pipeline and a draught fan.
Preferably, a buffer pool is further included; the inlet of the buffer tank is communicated with the bottom of the absorption tower through a pipeline, and the outlet of the buffer tank is communicated with the bottom of the absorption tower through a pipeline and a buffer pump.
The invention has the beneficial effects that: the invention provides a gypsum wet flue gas desulfurization method and a system, wherein the method can ensure that the desulfurization process stably operates by adjusting the operation of the system, effectively improve the quality of gypsum and improve the purity of gypsum; through slurry concentration adjustment, abrasion and blockage of a pipeline and a pump can be avoided, and overload operation of rotating equipment is avoided; the system adjusts the solid content and the Ph value of limestone slurry by combining the lime milk pool with the stirrer, thereby adjusting the mass of the absorbent and increasing the desulfurization effect and efficiency; the device concentrates and recovers the gypsum through the recovery device, thereby increasing the utilization rate of resources; the device has formed circulation system through the benefit thick liquid pump, can make full use of lime stone thick liquid, increases its utilization ratio, improves whole desulfurization efficiency.
The invention is further described with reference to the following figures and examples.
Drawings
FIG. 1 is a flow chart of a gypsum wet flue gas desulfurization method in an embodiment of the present invention;
FIG. 2 is a control system diagram of a gypsum wet flue gas desulfurization system in an embodiment of the invention.
Reference numerals: 1. a buffer pool; 2. a buffer pump; 3. a second mixer; 4. an oxidation fan; 5. an absorption tower; 6. a slurry supplement pump; 7. a gypsum slurry pump; 8. a water return pump; 9. a vacuum belt dehydrator; 10. a hydrocyclone; 11. a slag discharge pump; 12. a screw feeder; 13. a lime powder tank; 14. a chimney; 15. an induced draft fan; 16. a first mixer; 17. a lime milk tank; 18. a heater; 19. a lime milk pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A gypsum wet flue gas desulfurization method, the flow chart is shown in figure 1, limestone is prepared into a slurry; preparing lime slurry into an absorbent and sending the absorbent into an absorption tower 5;
the flue gas to be desulfurized enters an absorption tower 5, and the absorbent is sprayed and desulfurized through a slurry distribution pipeline and is discharged from the top of the absorption tower 5;
adjusting the Ph value of the slurry pool, wherein the Ph range is 5.5-6.0;
detecting the content of calcium sulfate in the slurry tank; and adjusting the air inlet quantity of the oxidation fan 4 and the opening degree of the lime milk pump 19 according to the content of the calcium sulfate.
Detecting the concentration of lime slurry entering the absorption tower 5 and comparing the concentration with a standard value; when the concentration of the lime slurry is lower than the standard value, the water flushing amount of the demister and the water inlet amount of the absorption tower 5 are reduced, the gypsum slurry pump 7 is closed, and the vacuum belt dehydrator 9 is suspended; the opening of the gypsum slurry pump 7 is increased when the concentration of the lime slurry is higher than the standard.
Detecting the liquid level height of the slurry pool; when the liquid level is higher, the opening degree of the gypsum slurry pump 7 is increased, the flushing water door of the demister is closed, and the gypsum slurry enters the buffer tank 1 through a pipeline; when the liquid level is lower, the buffer pump 2 is opened to feed the gypsum slurry into the slurry tank from the buffer tank 1.
A gypsum wet flue gas desulfurization system is shown in figure 1-2 and comprises a process water system, a powder preparation device, a pulping device and an absorption tower 5;
the powder preparation device comprises a crusher, a screening machine, a dryer and a lime powder tank 13; the outlet of the crusher is communicated with the inlet of the screening machine through a pipeline, and the outlet of the screening machine is communicated with the dryer; the screening machine is communicated with the process water system; the dryer is communicated with the lime powder tank 13 through a gas tank pulse bag type dust collector; crushing limestone into limestone particles with the diameter less than 50mm by a crusher and a screening machine; then grinding the lime powder by a grinding mill, and sending the lime powder into a lime powder tank 13 through a pipeline and a vulcanizing fan;
the pulping device comprises a lime milk tank 17; the lime powder tank 13 is communicated with a lime milk pool 17 through a screw feeder 12; a first stirrer 16 is erected above the lime milk pool 17, and the bottom of the lime milk pool is communicated with a slag discharge pump 11 through a pipeline; the lime milk tank 17 is communicated with a process water system through a pipeline;
the top of the absorption tower 5 is communicated with a discharge flue, the upper part is communicated with a lime milk pool 17 through a pipeline and a lime milk pump 19, and the middle part is communicated with a smoke inlet pipeline; specifically, the inside of the absorption tower 5 is provided with a demister, a spraying layer and a slurry tank from top to bottom in sequence; the spraying layer comprises a slurry distribution pipeline and a plurality of nozzles arranged on the slurry distribution pipeline; the slurry tank is communicated with an oxidation fan 4; the absorption tower 5 is provided with a second stirrer 3 above the inlet of the oxidation fan 4; the lime milk pump 19 is communicated with the inlet of the slurry distribution pipeline through an absorbent preparation system and is communicated with the slurry tank through a pipeline; a heater 18 is arranged between the absorption tower 5 and the discharge flue.
Furthermore, the device also comprises a recovery device for the secondary utilization of resources; the recovery unit comprises a hydrocyclone 10; the bottom of the absorption tower 5 is communicated with the inlet of a hydrocyclone 10 through a pipeline and a gypsum slurry pump 7, and the outlet of the hydrocyclone 10 is communicated with a vacuum belt dehydrator 9 through a pipeline; the water discharge pipes of the hydraulic cyclone 10 and the vacuum belt dehydrator 9 are communicated with the bottom of the absorption tower 5 through a pipeline and a water return pump 8.
Preferably, a circulating slurry supplementing system is further arranged, and an inlet and an outlet of the slurry supplementing pump 6 are respectively communicated with the slurry pool and the slurry distribution pipeline through pipelines; the discharge flue is communicated with a chimney 14 through a pipeline and a draught fan 15.
Further, the device also comprises a buffer pool 1; the inlet of the buffer pool 1 is communicated with the bottom of the absorption tower 5 through a pipeline, and the outlet of the buffer pool is communicated with the bottom of the absorption tower 5 through a pipeline and a buffer pump 2 for adjusting the internal reaction.
In the present embodiment, the first and second electrodes are,
firstly, crushing limestone into particles by a crusher, filtering the limestone particles with the diameter larger than 50mm by using a screening machine, introducing process water by using a process water system, washing the screened limestone, removing most of fluoride, soluble chloride and some water-soluble impurities by washing the process water, drying by using a dryer, grinding by using a grinding mill, and sending lime powder into a lime powder tank 13 by using a pipeline and a vulcanizing fan;
feeding lime powder into a lime milk pool 17 through a screw feeder 12, injecting water to adjust the density to reach the standard of 1230 kg per cubic meter, namely the solid content is 30%, then feeding the slurry into a slurry pool of an absorption tower 5, preparing the slurry into an absorbent meeting the standard through an absorbent preparation system, feeding the absorbent into a spraying layer, spraying fog drops through nozzles on a slurry distribution pipeline, and reacting with the flue gas entering a flue gas inlet pipeline;
oxygen required by the reaction is provided by an oxidation fan 4, and the gas is scattered by a second stirrer 3, so that the calcium sulfate oxidation reaction is facilitated; the desulfurized flue gas is passed through a demister to remove residual slurry fog drops, and then is discharged to the atmosphere through a flue, a baffle and a chimney 14 in sequence.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A gypsum wet flue gas desulfurization method is characterized by comprising the following steps:
preparing limestone into a slurry; preparing lime slurry into an absorbent and sending the absorbent into an absorption tower (5);
the flue gas to be desulfurized enters an absorption tower (5), and the absorbent is sprayed and desulfurized through a slurry distribution pipeline and is discharged from the top of the absorption tower (5);
adjusting the Ph value of a slurry pool at the bottom of the absorption tower (5), wherein the Ph range is 5.5-6.0;
detecting the content of calcium sulfate in the slurry tank; and adjusting the air inflow of the oxidation fan (4) and the opening of the lime milk pump (19) according to the content of the calcium sulfate.
2. The gypsum wet flue gas desulfurization method according to claim 1, wherein the concentration of the lime slurry entering the absorption tower (5) is detected and compared with a standard value, and when the concentration of the lime slurry is lower than the standard value, the flushing water amount of the demister and the water inlet amount of the absorption tower (5) are reduced, the gypsum slurry pump (7) is closed, and the vacuum belt dehydrator (9) is suspended; when the concentration of the lime slurry is higher than the standard, the opening degree of the gypsum slurry pump (7) is increased.
3. The gypsum wet flue gas desulfurization method of claim 1, wherein the liquid level height of the slurry tank is detected; when the height of the slurry pool is higher than a preset value, the opening degree of a gypsum slurry pump (7) is increased, and a demister flushing water door is closed; when the liquid level is lower than the standard, the buffer pump (2) is started to feed the gypsum slurry into the slurry tank from the buffer tank (1).
4. A gypsum wet flue gas desulfurization system, comprising:
the absorption tower (5), wherein a demister, a spraying layer and a slurry pool are sequentially erected in the absorption tower (5) from top to bottom; the spraying layer comprises a slurry distribution pipeline and a plurality of nozzles arranged on the slurry distribution pipeline;
a lime milk tank (17) communicated with the inlet of the slurry distribution pipeline through a pipeline and a lime milk pump (19);
the discharge flue is communicated with the top of the absorption tower (5);
the smoke inlet pipeline is communicated with the absorption tower (5) and is arranged below the spraying layer; a heater (18) is arranged between the absorption tower (5) and the discharge flue;
the oxidation fan (4) is communicated with the slurry tank; and a second stirrer (3) is erected above the inlet of the oxidation fan (4) in the absorption tower (5).
5. The gypsum wet flue gas desulfurization system of claim 4, further comprising a pulverizing device; the powder preparation device comprises a crusher, a screening machine, a dryer, a pulverizer and a lime powder tank (13); the outlet of the crusher is communicated with the inlet of the screening machine through a pipeline, and the outlet of the screening machine is communicated with the dryer; the screening machine is communicated with a process water system; the dryer is communicated with the pulverizer, and the pulverizer is communicated with the lime powder tank (13) through a pipeline; the lime powder tank (13) is communicated with the lime milk pool (17) through a screw feeder (12); a first stirrer (16) is erected above the lime milk pool (17), the bottom of the lime milk pool is communicated with a slag discharge pump (11) through a pipeline, and the top of the lime milk pool is communicated with the process water system.
6. The gypsum wet flue gas desulfurization system of claim 4, further comprising a recovery unit; the recovery device comprises a hydrocyclone (10); the bottom of the absorption tower (5) is communicated with the inlet of the hydrocyclone (10) through a pipeline and a gypsum slurry pump (7), and the outlet of the hydrocyclone (10) is communicated with a vacuum belt dehydrator (9) through a pipeline; the water discharge pipes of the hydraulic cyclone (10) and the vacuum belt dehydrator (9) are communicated with the bottom of the absorption tower (5) through a pipeline and a water return pump (8).
7. The gypsum wet flue gas desulfurization system of claim 6, further comprising a slurry makeup pump (6); and the inlet and the outlet of the slurry supplementing pump (6) are respectively communicated with the slurry pool and the slurry distribution pipeline through pipelines.
8. The gypsum wet flue gas desulfurization system of claim 5, wherein the lime powder tank (13) is erected at its bottom with a vulcanizing blower and a fluidization plate.
9. The gypsum wet flue gas desulfurization system of claim 4, further comprising a chimney (14); the discharge flue is communicated with the chimney (14) through a pipeline and a draught fan (15).
10. The gypsum wet flue gas desulfurization system of claim 4, further comprising a buffer tank (1); the inlet of the buffer pool (1) is communicated with the bottom of the absorption tower (5) through a pipeline, and the outlet of the buffer pool is communicated with the bottom of the absorption tower (5) through a pipeline and a buffer pump (2).
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| CN202110547464.4A CN113181758A (en) | 2021-05-19 | 2021-05-19 | Gypsum wet flue gas desulfurization method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114159945A (en) * | 2021-11-29 | 2022-03-11 | 内蒙古黄陶勒盖煤炭有限责任公司 | Wet flue gas desulfurization system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114159945A (en) * | 2021-11-29 | 2022-03-11 | 内蒙古黄陶勒盖煤炭有限责任公司 | Wet flue gas desulfurization system and method |
| CN114159945B (en) * | 2021-11-29 | 2024-03-12 | 内蒙古黄陶勒盖煤炭有限责任公司 | Wet flue gas desulfurization system and method |
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