CN112023681A - Method and system for performing circulating fluidized bed desulfurization by adopting rotary spray desulfurization ash - Google Patents

Method and system for performing circulating fluidized bed desulfurization by adopting rotary spray desulfurization ash Download PDF

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Publication number
CN112023681A
CN112023681A CN202010866814.9A CN202010866814A CN112023681A CN 112023681 A CN112023681 A CN 112023681A CN 202010866814 A CN202010866814 A CN 202010866814A CN 112023681 A CN112023681 A CN 112023681A
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China
Prior art keywords
desulfurization
flue gas
ash
fluidized bed
circulating fluidized
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CN202010866814.9A
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Chinese (zh)
Inventor
李金明
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Nanjing Jinjiang Metallurgical Burden Co ltd
Nanjing Iron and Steel Co Ltd
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Nanjing Jinjiang Metallurgical Burden Co ltd
Nanjing Iron and Steel Co Ltd
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Priority to CN202010866814.9A priority Critical patent/CN112023681A/en
Publication of CN112023681A publication Critical patent/CN112023681A/en
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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
    • B01D53/80—Semi-solid phase processes, i.e. by using slurries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • 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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/604—Hydroxides
    • 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 discloses a method and a system for desulfurizing a circulating fluidized bed by adopting rotary spray desulfurization ash. On one hand, the requirement of the circulating fluidized bed flue gas desulfurization system on the desulfurizer is met, and the use cost of the desulfurizer is greatly reduced; on the other hand, the recycling is cancelled, so that the inevitable efficiency loss when a complex circulating system is used for manufacturing circulating slurry is reduced, the waste of the rotary spray flue gas desulfurization system caused by the recycling of the desulfurization ash is reduced, the desulfurization efficiency of the rotary spray flue gas desulfurization system is further improved, and the complete recycling of the desulfurization ash is realized.

Description

Method and system for performing circulating fluidized bed desulfurization by adopting rotary spray desulfurization ash
Technical Field
The invention belongs to the technical field of flue gas desulfurization, and particularly relates to a method and a system for performing circulating fluidized bed desulfurization by adopting rotary spray desulfurization ash.
Background
In the semi-dry process of sintering flue gas desulfurization, two mainstream processes of a rotary spray flue gas desulfurization method and a circulating fluidized bed flue gas desulfurization method are mostly applied at present. Most steel enterprises have a plurality of sintering machines, wherein a plurality of enterprises adopt different semi-dry desulfurization processes for different sintering machines, namely the enterprises have the two processes simultaneously.
The rotary spray flue gas desulfurization technology adopts a rotary sprayer, untreated hot flue gas is introduced into a desulfurization tower and then is contacted with atomized calcium hydroxide slurry, and acidic components in the flue gas are absorbed by alkaline fog drops while water is evaporated to become alkaline particles. By accurately controlling the flue gas distribution, the flow rate of the desulfurization slurry and the size of the fog drops, the fog drops can be ensured to be converted into fine powder. The treated flue gas continuously enters a dust remover to remove residual suspended particles, the purified flue gas is discharged through a chimney, some fly ash and desulfurization slag are discharged from the bottom of an absorption tower, and are sent into a recirculation system together with dry powder particles discharged from the bottom of the dust remover to prepare recirculation slurry, and the recirculation slurry is sent into a rotary sprayer to improve the absorption and drying performances.
The circulating fluidized bed flue gas desulfurization technique is characterized by that the untreated flue gas is fed into the bottom of desulfurization absorption tower, and accelerated and swirled in the fluidized bed, and mixed with powdered desulfurizing agent and fluidized, and under the condition of spraying uniform water mist to reduce flue gas temperature the desulfurizing agent can be reacted with sulfur dioxide in the flue gas. And (3) discharging flue gas carrying a large amount of solid particles after desulfurization from the top of the absorption tower, allowing the flue gas to enter a bag-type dust collector, returning the separated particles to the desulfurization absorption tower, and repeatedly circulating the solid particles so as to complete desulfurization.
From the operation cost analysis, the two processes have equivalent cost, and the circulating fluidized bed flue gas desulfurization technology has more obvious advantages in the aspect of desulfurizer consumption and higher desulfurization efficiency. The rotary spray flue gas desulfurization technology has obvious advantages in power consumption, but more desulfurizing agents are needed to improve the desulfurization efficiency. There is currently no relevant art to maximize the advantages of both processes.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides the method for performing the desulfurization of the circulating fluidized bed by adopting the rotary spray desulfurization ash, and the method can utilize the desulfurization ash of the rotary spray desulfurization resource into the desulfurization of the circulating fluidized bed, thereby reducing the comprehensive cost of two desulfurization processes.
It is another object of the present invention to provide a system for carrying out the above method.
The technical scheme is as follows: the method for performing the circulating fluidized bed desulfurization by adopting the rotary spray desulfurization ash, which is disclosed by the invention, is characterized in that the desulfurization ash formed after the primary desulfurization of a desulfurizer of a rotary spray flue gas desulfurization system is conveyed into the circulating fluidized bed flue gas desulfurization system to be used as the desulfurizer for the circulating fluidized bed flue gas desulfurization.
Corresponding to the method for performing the circulating fluidized bed desulfurization by adopting the rotary spray desulfurization ash, the system for implementing the method comprises a rotary spray flue gas desulfurization system, a circulating fluidized bed flue gas desulfurization system, an intermediate buffering ash bin and a pneumatic conveying device, wherein the intermediate buffering ash bin is connected with a desulfurizer bin of the circulating fluidized bed flue gas desulfurization system; the desulfurization ash of the primary desulfurization of the rotary spray flue gas desulfurization system is conveyed to the middle buffering ash bin through the pneumatic conveying device for storage, and the middle buffering ash bin provides a desulfurizing agent for the desulfurizing agent bin.
The rotary spray flue gas desulfurization system comprises a lime slaking device, a rotary sprayer, a desulfurization tower and a dust remover; the desulfurization slurry produced by the lime slaking device is sprayed into the desulfurization tower through the rotary sprayer to perform primary desulfurization on the flue gas, and the desulfurized flue gas is discharged after being separated from desulfurized ash through a dust remover; and the desulfurization ash collected by the desulfurization tower and the dust remover is conveyed to the middle buffering ash bin through the pneumatic conveying device.
Has the advantages that: compared with the prior art, the method cancels the recycling of the desulfurization ash in the rotary spray flue gas desulfurization system, and directly uses the desulfurization ash subjected to primary desulfurization as the desulfurizer of the circulating fluidized bed flue gas desulfurization system. On one hand, the requirement of the circulating fluidized bed flue gas desulfurization system on the desulfurizer is met, and the use cost of the desulfurizer is greatly reduced; on the other hand, the recycling is eliminated, so that the complicated circulating system is reducedThe efficiency loss inevitable when making circulation thick liquid to reduce the waste of piling up of each equipment tower bottom ash among the rotatory spraying flue gas desulfurization system that causes because of the recirculation of desulfurization ash, and then also improved the desulfurization efficiency of rotatory spraying flue gas desulfurization system, realized the complete resourceization of desulfurization ash. Through comprehensive measurement and calculation, the method can reduce the consumption of about 1.2 tons of desulfurizer by removing tons of sulfur dioxide. The desulfurization efficiency of the rotary spray flue gas desulfurization system is improved by about 15 percent, and the hourly mean value of the concentration of the inlet sulfur dioxide is 1800mg/Nm3Can achieve less than 35mg/Nm3And stabilizing the ultralow emission standard. Therefore, the method breaks through the limitations of two semi-dry desulfurization processes, fully exerts the advantages of the two processes, realizes the resource utilization of the desulfurization ash, improves the desulfurization capability of the whole system, and realizes the comprehensive cost reduction of a plurality of sets of facilities.
Drawings
FIG. 1 is a process flow diagram of a system in an embodiment of the invention.
Detailed Description
The invention is further explained in detail by combining with the embodiment of a certain steel enterprise in China. Specifically, the two steel rabbet are 180m2The sintering machine originally adopts a rotary spray flue gas desulfurization technology to carry out flue gas desulfurization, and one 360m rotary spray flue gas desulfurization device2Sintering machine and 220m2The sintering machine adopts the circulating fluidized bed flue gas desulfurization technology to carry out flue gas desulfurization. In order to implement the method, two sets of desulfurization systems of the steel enterprise are modified, a recirculation system of the original rotary spray flue gas desulfurization system is omitted, and finally a system capable of implementing the method for performing the desulfurization of the circulating fluidized bed by adopting the rotary spray desulfurization ash is formed.
As shown in FIG. 1, the system comprises a rotary spray flue gas desulfurization system and a circulating fluidized bed flue gas desulfurization system. The rotary spray flue gas desulfurization system comprises a dust pre-collecting dust remover, a lime slaking device, a rotary sprayer, a desulfurization tower, a dust remover and a chimney. The flue gas enters a desulfurizing tower after being subjected to preliminary dust removal through a dust pre-collecting dust remover, and a lime slaking device prepares hydrated lime slurry through sintering lime and water, and the hydrated lime slurry is used as the desulfurization slurry of a rotary spray flue gas desulfurization system and is conveyed to a top tank for standby. And spraying the desulfurization slurry into the desulfurization tower through a rotary sprayer, and carrying out primary desulfurization on the flue gas in the rotary sprayer. And the desulfurized flue gas enters a dust remover, and the desulfurized ash is separated by the dust remover and then discharged from a chimney. The desulfurized ash collected by the desulfurizing tower and the dust remover is conveyed to the middle buffering ash bin through the pneumatic conveying device to be stored for standby.
The desulfurized fly ash still contains considerable desulfurization effective components because the desulfurized fly ash is subjected to desulfurization once. Specifically, the effective desulfurization component is mainly calcium hydroxide and also contains part of calcium carbonate. Through analysis, the content of the effective desulfurization components in the desulfurization ash can be controlled to be 30-52% by mass, wherein the content of the calcium hydroxide in the desulfurization ash accounts for 30-40% by mass of the total amount of the desulfurization ash.
Compared with the prior art, the desulfurized ash is repeatedly recycled in the desulfurization process before being reformed, the content of calcium hydroxide in the actual final product is generally about 10 percent and is not more than 16.5 percent at most, and other calcium sulfite and calcium sulfate exist in the forms of calcium sulfite and calcium sulfate, so that the desulfurized ash cannot be directly used in the flue gas desulfurization system of the circulating fluidized bed.
In addition, this embodiment also reforms the recirculation system who cancels into lime slaking device, and as reserve supplementary original lime slaking device, the condition of avoiding the digestion ability not enough influences the desulfurization and goes on.
In the practical application of this embodiment, it is further found that, since the recycling system is eliminated, the efficiency loss caused by the addition of the fresh slurry into the desulfurized fly ash and water in the recycling system is effectively avoided, and the waste of the accumulated fly ash at the bottom of the tower is reduced to a certain extent. The use of desulfurization slurry (desulfurizer) in the rotary spray flue gas desulfurization system is not increased. The hourly mean value of the concentration of the inlet sulfur dioxide is 1800mg/Nm3Can achieve less than 35mg/Nm3The ultra-low emission standard is stabilized, the target emission effect can be achieved by one-time desulfurization, and the desulfurization efficiency is improved by about 15%.
On the other hand, an ash conveying pipeline is laid in a desulfurizer bin (lime slaking bin) of the original circulating fluidized bed flue gas desulfurization system, and the desulfurization ash in the middle buffer ash bin is conveyed into the desulfurizer bin to be used as the desulfurizer of the circulating fluidized bed flue gas desulfurization system. The flue gas of the sintering machine is initially dedusted by the head electric precipitator, and then is pumped into the desulfurization absorption tower by the main exhaust fan to be mixed with the desulfurizer. Because the circulating fluidized bed flue gas desulfurization system has small consumption of the desulfurizer and high utilization rate of the desulfurizer, the desulfurized fly ash subjected to primary desulfurization can reach the target emission standard through reciprocating circulating absorption, and thus the preparation and use costs of the original slaked lime desulfurizer are greatly reduced. The whole desulfurizer consumption is greatly reduced, virtuous cyclic utilization of a plurality of sintering desulfurization systems is realized, comprehensive measurement and calculation are carried out, and about 1.2 tons of desulfurizer consumption can be reduced by removing tons of sulfur dioxide.

Claims (10)

1. A method for desulfurizing by a circulating fluidized bed by adopting rotary spray desulfurization ash is characterized in that desulfurization ash formed after primary desulfurization of a desulfurizing agent of a rotary spray flue gas desulfurization system is conveyed into the circulating fluidized bed flue gas desulfurization system to be used as the desulfurizing agent for flue gas desulfurization of the circulating fluidized bed.
2. The method for performing the circulating fluidized bed desulfurization by using the rotary spray desulfurization ash as claimed in claim 1, wherein the mass percentage of the desulfurization effective components in the desulfurization ash is 30-52%.
3. The method for performing the circulating fluidized bed desulfurization by using the rotary spraying desulfurization ash as claimed in claim 2, wherein the desulfurization effective component in the desulfurization ash comprises calcium hydroxide, and the mass percentage of the calcium hydroxide is 30-40% of the total amount of the desulfurization ash.
4. The method for desulfurization in a circulating fluidized bed using a revolving spray desulfurization ash according to claim 3, wherein the desulfurization effective component of the desulfurization ash further comprises calcium carbonate.
5. A system for implementing the method for performing the circulating fluidized bed desulfurization by using the rotary spray desulfurization ash according to any one of claims 1 to 4, comprising a rotary spray flue gas desulfurization system and a circulating fluidized bed flue gas desulfurization system, and further comprising an intermediate buffering ash bin and a pneumatic conveying device, wherein the intermediate buffering ash bin is connected with a desulfurizing agent bin of the circulating fluidized bed flue gas desulfurization system; the desulfurization ash of the primary desulfurization of the rotary spray flue gas desulfurization system is conveyed to the middle buffering ash bin through the pneumatic conveying device for storage, and the middle buffering ash bin provides a desulfurizing agent for the desulfurizing agent bin.
6. The system of claim 5, wherein the rotary spray flue gas desulfurization system comprises a lime slaking apparatus, a rotary atomizer, a desulfurization tower, a dust separator; the desulfurization slurry produced by the lime slaking device is sprayed into the desulfurization tower through the rotary sprayer to perform primary desulfurization on the flue gas, and the desulfurized flue gas is discharged after being separated from desulfurized ash through a dust remover; and the desulfurization ash collected by the desulfurization tower and the dust remover is conveyed to the middle buffering ash bin through the pneumatic conveying device.
7. The system of claim 5, wherein the rotary spray flue gas desulfurization system comprises two sets of lime slaking units, one of which is a back-up auxiliary lime slaking unit.
8. The system of claim 5, wherein the rotary spray flue gas desulfurization system further comprises a dust pre-collection deduster, and the flue gas enters the desulfurization tower after being subjected to preliminary dedusting by the dust pre-collection deduster.
9. The system of claim 5, wherein the circulating fluidized bed flue gas desulfurization system comprises a desulfurization absorption tower, and the desulfurizing agent of the desulfurizing agent bin enters the desulfurization absorption tower from the bottom of the desulfurization absorption tower.
10. The system of claim 9, wherein the circulating fluidized bed flue gas desulfurization system comprises an electric head dust remover, and flue gas enters a desulfurization absorption tower of the circulating fluidized bed flue gas desulfurization system after being subjected to preliminary dust removal by the electric head dust remover.
CN202010866814.9A 2020-08-25 2020-08-25 Method and system for performing circulating fluidized bed desulfurization by adopting rotary spray desulfurization ash Pending CN112023681A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113332849A (en) * 2021-06-09 2021-09-03 江苏三井环保股份有限公司 Flue gas SDA (serial advanced technology architecture) desulfurization and dust removal method
CN113578005A (en) * 2021-08-17 2021-11-02 承德建龙特殊钢有限公司 Flue gas circulating fluidized bed semidry method desulfurization method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113332849A (en) * 2021-06-09 2021-09-03 江苏三井环保股份有限公司 Flue gas SDA (serial advanced technology architecture) desulfurization and dust removal method
CN113578005A (en) * 2021-08-17 2021-11-02 承德建龙特殊钢有限公司 Flue gas circulating fluidized bed semidry method desulfurization method
CN113578005B (en) * 2021-08-17 2024-03-22 承德建龙特殊钢有限公司 Semi-dry desulfurization method of flue gas circulating fluidized bed

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