CN1281747A - Flue gas desulfurization technology and equipment by using lime/gypsum method - Google Patents
Flue gas desulfurization technology and equipment by using lime/gypsum method Download PDFInfo
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- CN1281747A CN1281747A CN 99113914 CN99113914A CN1281747A CN 1281747 A CN1281747 A CN 1281747A CN 99113914 CN99113914 CN 99113914 CN 99113914 A CN99113914 A CN 99113914A CN 1281747 A CN1281747 A CN 1281747A
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Abstract
The flue gas desulfurization technology by using lime/gypsum method includes the follwing steps: (1) removing dust; (2) desulfurizing; (3) making liquid mixture containing gypsum crystal body and (4) dehydrating to produce by-product gypsum. It is characterized by that the dust-removed flue gas is passed through booster fan and humidification cooling device and fed into desulfurization tower, then the flue gas is passed through perforated-plate bubbling device in the tower and desulfurized, and then passed through spraying liquor to implement secondary desulfurization, then the purified flue gas is passed through the gas-liquid separator positioned on the top of tower and flue gas heater, then discharged into chimney. Said invented equipment includes dust-remover, booster fan, air fan, desulfurization tower, circulating pump, solid-liquid separator and lime slurry preparing system.
Description
The invention relates to a flue gas desulfurization technology and a device, in particular to a technology and a device capable of converting flue gas desulfurized into gypsum byproducts.
Currently, the SO removal of flue gas is carried out in foreign countries2The process mainly adopts a lime/gypsum method, and a small amount of dry desulphurization is adopted. The former has high desulfurization efficiency which reaches 90-95 percent and the lowest 80 percent, and the latter has efficiency which is generally 60-70 percent. The domestic desulfurization technology is only simple desulfurization by a lime water method. Compared with the domestic and overseas desulfurization technologies, the method has obvious gap. The foreign complete technology is mature and reliable, has no secondary pollution and produces gypsum, but the complete technology equipment has extremely high selling price and is difficult to bear by general enterprises (taking 2 sets of 360 MW/h units of Sichuan Luohang power plants as an example, the total price of 2 sets of desulfurizing devices is 3.6 billion yuan; 2 sets of 125 MW/h units of Zhejiang half-mountain power plants are 3.8 billion yuan). Therefore, it is not possible to introduce a large amount of substances in the future, and it is necessary to establish a technology and a complete equipment for localization on the basis of a digestion and absorption foreign technology. The applicant's patent application No. 97108252.9The disclosed technology and apparatus for flue gas desulfurization affect the durability and smoke evacuation of the equipment due to lack of control and regulation of flue gas temperature
The invention aims to solve the problems and provide a lime/gypsum method flue gas desulfurization technology and a device which have the advantages of simple process, reliable equipment operation, low investment, good implementation effect and no secondary pollution.
The purpose of the invention is realized by the following technical scheme:
the lime/gypsum method flue gas desulfurization technology of the invention comprises the following steps: (1) dust removal, (2) desulfurization, (3) mixed liquid containing gypsum crystal is prepared, (4) gypsum is a byproduct of dehydration, and the method is characterized in that:
and (2) the desulfurization is that the dedusted flue gas is conveyed by a booster fan to pass through a humidifying cooler, so that the temperature of the flue gas is reduced to be less than or equal to 100 ℃ from 140-150 ℃, then the flue gas enters a desulfurization tower, the flue gas is firstly desulfurized by bubbling through a perforated plate in the tower, the flue gas which is lifted from a bubble layer is secondarily desulfurized through a spray liquid, the purified flue gas is baffled by a gas-liquid separator at the top of the tower to remove entrained liquid drops by utilizing inertia, and the flue gas is discharged out of the tower and immediately passes through a flue gas heater so that the temperature of the flue gas is increased to be more than or equal.
And (4) discharging the mixed liquid prepared in the step (3) from the lower part of the tower, returning the majority of the mixed liquid to the desulfurizing tower through a circulating pump to be used as spray liquid, conveying the minor part of the spray liquid to a vacuum belt filter for solid-liquid separation, and obtaining solid which is the byproduct gypsum.
The device for the flue gas desulfurization technology comprises a dust remover, a booster fan, an air fan, a desulfurizing tower, a circulating pump, a solid-liquid separator and a lime pulping system, wherein the dust remover is connected with the desulfurizing tower through a pipeline, the booster fan is arranged on the pipeline, an outlet at the lower part of the desulfurizing tower is connected with the circulating pump through a pipeline, an outlet of the circulating pump is respectively connected with the desulfurizing tower and the solid-liquid separator through pipelines, the air fan and the lime pulping system are respectively connected with the lower part of the desulfurizing tower through pipelines, and the device is characterized in that a humidifying cooler is connected between the dust remover and the desulfurizing tower, and a flue gas heater is arranged between a smoke outlet.
The solid-liquid separator is a vacuum belt filter, and a thickener is arranged on an input pipeline connected with the vacuum belt filter.
The invention absorbs SO in the flue gas by lime water2And then gypsum is generated through oxidation, calcium hydroxide neutralization and crystallization, the arrangement of the complete equipment is compact, and the desulfurization efficiency can reach 85-90%; the invention adopts cheap Ca (OH)2As a desulfurization reactant, waste carbide slag can be used for replacing lime for reaction, and the absorption liquid adopts a circulation mode, so that the cost is low. The desulfurization tower adopted by the invention integrates absorption, oxidation, neutralization and crystallization, can thoroughly eliminate secondary pollution, has simple and reliable whole set of devices, small investment which is equal to 1/5-1/10 of the investment amount of devices introduced abroad, occupies less land, has low operation cost and is suitable for domestic popularization and application. Book (I)The sulfur-containing flue gas is cooled by a humidifying cooler before entering the desulfurizing tower, so that the protective lining of the desulfurizing tower can be protected; the purified flue gas is heated by the heater before being discharged into the chimney from the tower, so that the flue and the chimney can be prevented from being corroded by condensation, and the rising speed and the rising height of the flue gas emission can be increased. The invention can be widely used for the smoke discharge treatment of industrial boilers in thermal power plants, sintering plants, sulfuric acid plants, chemical plants, nonferrous smelting plants, paper mills and the like, and has wide application markets.
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram of the process of the present invention;
FIG. 2 is a schematic diagram of an apparatus for use in the process of the present invention.
The labels in the figures indicate: the system comprises a dust remover 1, a booster fan 2, an air fan 3, a desulfurizing tower 4, a circulating pump 5, a wastewater pool 6, a wastewater pump 7, a thickener 8, a vacuum belt filter 9, a chimney 10, a belt conveyor 11, a pulping tank 12, a filter 13, a pulp pool 14, a pulp pump 15, a flue gas heater 16 and a humidifying cooler 17.
The lime/gypsum method flue gas desulfurization technology comprises the following steps:
(1) the dust removal is to feed the sulfur-containing and dust-containing flue gas into a dust remover 1 to separate dust particles from the flue gas. The dust removal can adopt the modes of electric dust removal, cyclone dust removal, cloth bag dust removal or water film dust removal and the like;
(2) the flue gas after desulfurization and dust removal is pressurized by a booster fan 2, is cooled (from 140-150 ℃ to less than or equal to 100 ℃) by a humidifying cooler 17 and then enters a desulfurization tower 4, the flue gas is firstly subjected to multi-plate bubbling desulfurization in an absorption liquid spraying state in the tower, and the flue gas which leaves a bubble layer and rises along the tower is absorbed by the absorption liquid sprayed in the middle of the tower to perform secondary desulfurization. The purified flue gas rises and is separated by a gas-liquid separator at the top of the tower, and then is heated by a flue gas heater 16 (the temperature of the flue gas rises to be more than or equal to 70 ℃) and then is discharged from a chimney 10.
(3) The mixed liquid containing gypsum crystal absorbs SO in the flue gas2The desulfurization solution is oxidized with air blown in by an air fan 3 at the lower part of the desulfurization tower, and then reacts with slaked lime input by a pulping system to generate gypsum crystal, and the whole reaction process is as follows:
the overall reaction formula is: the mixed liquid of gypsum and desulfurizing liquid is in suspension state, wherein the content of gypsum is 25-30 wt%. Since the main absorption reaction is completed in the bubbling layer, the absorption liquid does not need a large circulation amount, and thus the power consumption is low.
(4) And (3) discharging the mixed liquid prepared in the step (3) of dehydrating the byproduct gypsum from the lower part of the tower, returning the majority of the mixed liquid to the desulfurizing tower through a circulating pump 5 to be used as spraying liquid, and conveying the minor part of the spraying liquid to a vacuum belt filter 9 for solid-liquid separation, wherein the obtained solid is the byproduct gypsum. Wherein the mixed solution is pre-separated by sedimentation in a thickener 8 before filtration.
And (4) introducing the wastewater separated in the step (4) into a wastewater tank 6, and conveying the wastewater to a slurry (lime slurry) preparation tank 12 through a wastewater pump 7, or conveying the wastewater to a desulfurizing tower 4 as make-up water, or conveying the wastewater to an ash residue tank.
The device used in the flue gas desulfurization technology of the invention is as follows: the dust remover 1, the booster fan 2, the humidifying cooler 17 and the desulfurizing tower 4 are sequentially connected through a pipeline, a porous plate is arranged in the desulfurizing tower 4 and used for bubbling and desulfurizing flue gas, a spray head and a spray pipe are arranged above the porous plate and used for spraying desulfurizing liquid, a gas-liquid separator is arranged at the top of the desulfurizing tower, a liquid pool is arranged at the lower part of the desulfurizing tower, the inlet of the liquid pool is respectively connected to the air fan 3, the slurry pump 15 and a water replenishing pipe, and the outlet of the liquid pool is connected to the circulating pump 5. The outlet of the circulating pump 5 is communicated with a spray pipe in the desulfurizing tower 4 through a pipeline and used for returning most of mixed liquid containing gypsum to the desulfurizing tower for spraying, and the outlet of the circulating pump 5 is communicated with the thickener 8 and the vacuum belt filter 9 through pipelines and used for separating a small part of mixed liquid and taking out the gypsum. The vacuum belt filter outlet leads to a waste reservoir 6 in which a waste pump 7 is arranged. The flue gas outlet of the desulfurizing tower 4 is communicated with a chimney 10 through a flue pipe, and a flue gas heater 16 is arranged on the connected flue pipe. The slurry pump 15 is connected with the slurry pool 14. A pulping tank 12 and a filter 13 are connected to a slurry tank 14 through pipelines. A belt conveyor 11 is provided to be fitted to the slurrying trough 12.
Claims (4)
1. The lime/gypsum method flue gas desulfurization technology comprises the following steps: (1) dust removal, (2) desulfurization, (3) preparation of mixed liquid containing gypsum crystals, and (4) dehydration of by-product gypsum, which is characterized in that:
and (2) the desulfurization is that the dedusted flue gas is conveyed by a booster fan to pass through a humidifying cooler, so that the temperature of the flue gas is reduced to be less than or equal to 100 ℃ from 140-150 ℃, then the flue gas enters a desulfurization tower, the flue gas is firstly desulfurized by bubbling through a perforated plate in the tower, the flue gas which is lifted from a bubble layer is secondarily desulfurized through a spray liquid, the purified flue gas is baffled by a gas-liquid separator at the top of the tower to remove entrained liquid drops by utilizing inertia, and the flue gas is discharged out of the tower and immediately passes through a flue gas heater so that the temperature of the flue gas is increased to be more than or equal.
2. The flue gas desulfurization technique according to claim 1, wherein the gypsum as a byproduct in the dehydration step (4) is obtained by discharging the mixed solution obtained in the step (3) from the lower part of the tower, returning the major part of the mixed solution to the desulfurization tower through a circulating pump, using the minor part of the mixed solution as a spray solution, and passing the minor part of the mixed solution through a vacuum belt filter for solid-liquid separation, wherein the obtained solid is gypsum as a byproduct.
3. The device for the flue gas desulfurization technology of claim 1, comprising a dust remover (1), a booster fan (2), an air fan (3), a desulfurizing tower (4), a circulating pump (5), a solid-liquid separator and a lime slurrying system, wherein the dust remover (1) is connected with the desulfurizing tower (4) through a pipeline, the booster fan (2) is arranged on the pipeline, the outlet at the lower part of the desulfurizing tower (4) is connected with the circulating pump (5) through a pipeline, the outlet of the circulating pump (5) is respectively connected with the desulfurizing tower (4) and the solid-liquid separator through pipelines, the air fan (3) and the lime slurrying system are respectively connected with the lower part of the desulfurizing tower (4) through pipelines, and the device is characterized in that a humidifying cooler (17) is connected between the dust remover (1) and the desulfurizing tower (4), and a flue gas heater (16) is arranged between the.
4. The apparatus as claimed in claim 3, characterized in that the solid-liquid separator is a vacuum belt filter (9) with a thickener (8) arranged in the feed line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991139143A CN1136946C (en) | 1999-07-27 | 1999-07-27 | Flue gas desulfurization technology and equipment by using lime/gypsum method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991139143A CN1136946C (en) | 1999-07-27 | 1999-07-27 | Flue gas desulfurization technology and equipment by using lime/gypsum method |
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| CN1281747A true CN1281747A (en) | 2001-01-31 |
| CN1136946C CN1136946C (en) | 2004-02-04 |
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| CNB991139143A Expired - Fee Related CN1136946C (en) | 1999-07-27 | 1999-07-27 | Flue gas desulfurization technology and equipment by using lime/gypsum method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321720C (en) * | 2005-08-16 | 2007-06-20 | 孙克勤 | Impact and low-consumption smoke gas desulfurizer |
| CN100572920C (en) * | 2006-12-30 | 2009-12-23 | 中国科学院电工研究所 | Flue gas heater by evaporative cooling |
| CN101799245A (en) * | 2010-04-02 | 2010-08-11 | 华电重工装备有限公司 | Method and device for realizing waste-steam cooling, desulphurization and smoke removal of power stations through one tower |
| CN103699146A (en) * | 2013-12-09 | 2014-04-02 | 云南新立有色金属有限公司 | Titanium tetrachloride condensation system and pressure control method thereof |
| CN104197343A (en) * | 2014-08-29 | 2014-12-10 | 华北电力大学 | Oxygen-enriched combustion recycle flue gas catalytic desulfurization system and method |
| CN105582800A (en) * | 2015-10-26 | 2016-05-18 | 福建泉能石粉综合利用有限公司 | Method for carrying out desulphurization based on waste marble powder processing to treat waste with waste |
| CN107899408A (en) * | 2017-11-30 | 2018-04-13 | 南京师范大学 | A kind of wet method combines flue gas desulphurization system and sulfur method with dry method |
| CN108579356A (en) * | 2018-04-02 | 2018-09-28 | 安徽蓝天盈丰环保科技有限公司 | A kind of smoke desulfurizing dust-remover for boiler and method |
| CN115547534A (en) * | 2022-07-20 | 2022-12-30 | 中国核动力研究设计院 | Radioactive waste oil inorganic treatment method and system |
-
1999
- 1999-07-27 CN CNB991139143A patent/CN1136946C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321720C (en) * | 2005-08-16 | 2007-06-20 | 孙克勤 | Impact and low-consumption smoke gas desulfurizer |
| CN100572920C (en) * | 2006-12-30 | 2009-12-23 | 中国科学院电工研究所 | Flue gas heater by evaporative cooling |
| CN101799245A (en) * | 2010-04-02 | 2010-08-11 | 华电重工装备有限公司 | Method and device for realizing waste-steam cooling, desulphurization and smoke removal of power stations through one tower |
| CN103699146A (en) * | 2013-12-09 | 2014-04-02 | 云南新立有色金属有限公司 | Titanium tetrachloride condensation system and pressure control method thereof |
| CN103699146B (en) * | 2013-12-09 | 2016-06-29 | 云南冶金新立钛业有限公司 | The condenser system of titanium tetrachloride gases and compress control method thereof |
| CN104197343A (en) * | 2014-08-29 | 2014-12-10 | 华北电力大学 | Oxygen-enriched combustion recycle flue gas catalytic desulfurization system and method |
| CN105582800A (en) * | 2015-10-26 | 2016-05-18 | 福建泉能石粉综合利用有限公司 | Method for carrying out desulphurization based on waste marble powder processing to treat waste with waste |
| CN107899408A (en) * | 2017-11-30 | 2018-04-13 | 南京师范大学 | A kind of wet method combines flue gas desulphurization system and sulfur method with dry method |
| CN108579356A (en) * | 2018-04-02 | 2018-09-28 | 安徽蓝天盈丰环保科技有限公司 | A kind of smoke desulfurizing dust-remover for boiler and method |
| CN115547534A (en) * | 2022-07-20 | 2022-12-30 | 中国核动力研究设计院 | Radioactive waste oil inorganic treatment method and system |
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| CN1136946C (en) | 2004-02-04 |
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Effective date of registration: 20020125 Applicant after: Chen Ranzhen Co-applicant after: Zhang Yinxiao Address before: 314000 lotus dyke, Jiaxing City, Zhejiang province 1-203 Applicant before: Chen Ranzhen |
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