CN107952296B - Sintered pellet flue gas multi-pollutant collaborative purification system based on bag type dust removal - Google Patents

Sintered pellet flue gas multi-pollutant collaborative purification system based on bag type dust removal Download PDF

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CN107952296B
CN107952296B CN201711006741.0A CN201711006741A CN107952296B CN 107952296 B CN107952296 B CN 107952296B CN 201711006741 A CN201711006741 A CN 201711006741A CN 107952296 B CN107952296 B CN 107952296B
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flue gas
type dust
bag type
acid mist
ash
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CN107952296A (en
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余建华
姚群
陈志炜
刘立
赵霞
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Tiancheng Environment Protection Technology Co Ltd Zhonggang Group
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Tiancheng Environment Protection Technology Co Ltd Zhonggang Group
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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
    • B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
    • 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
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/003—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid
    • 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
    • B01D46/42—Auxiliary equipment or operation thereof
    • 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
    • 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
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • 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
    • B01D53/75—Multi-step processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/104—Ozone
    • 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
    • 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
    • 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
    • B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/602—Oxides
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/608—Sulfates
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a sintered pellet flue gas multi-pollutant collaborative purification system based on bag type dust removal. The device comprises a sintering machine or pelletizing device (1), an acid mist eliminator (2), a bag type dust collector (3), a denitration reactor (4), an induced draft fan (5), a wet desulphurization device (6), a chimney (7) and an ash circulation system; the acid mist eliminator (2) is arranged at the inlet of the bag type dust collector (3); the acid mist eliminator (2) comprises an impact disperser (201), a shell (202) and a partition plate (203); the ash circulation system adopts dust-free hot flue gas circulation behind the induced draft fan (5), and powder in the ash hopper of the bag type dust collector (3) is conveyed to the inlet of the acid mist eliminator (2), and then is dispersed by the impact disperser (201) and is uniformly mixed with inlet flue gas, and the acid mist in the flue gas is eliminated by the adsorption effect of the powder. This system replaces electrostatic precipitator with bag collector to improve dust entrapment efficiency in the flue gas, satisfy discharge to reach standard, avoid subsequent SOx/NOx control equipment to block up, scale deposit scheduling problem simultaneously, the corruption and the bag of sticking with paste of bag collector can be avoided to acid mist annihilator and ash circulation system that provide.

Description

Sintered pellet flue gas multi-pollutant collaborative purification system based on bag type dust removal
Technical Field
The invention relates to a synergic purification process for pollutants such as flue gas dust, sulfur dioxide, nitrogen oxides and the like of a sintering machine or a pelletizing device, belonging to the field of environmental protection atmospheric pollution control; in particular to a sintered pellet smoke multi-pollutant collaborative purification system based on bag type dust removal.
Background
The flue gas of the sintering machine or the pelletizing device is the flue gas generated in the process of sintering and forming the sinter at high temperature. Besides a large amount of dust, the flue gas also contains sulfur dioxide, nitrogen oxide and the like, and the flue gas is characterized in that: the temperature is suddenly high and low, the fluctuation is large, the flue gas humidity is large, acid condensation is easy to generate, and the corrosivity is strong. Therefore, electrostatic dust collection is adopted for flue gas dust collection at home and abroad, and bag type dust collection is not adopted, because the bag type dust collection is easy to stick a bag and the filter material is corroded when the flue gas is condensed.
At present, the flue gas of a sintering machine head is mostly provided with an electrostatic dust collector, and the main reason is that the electrostatic dust collector has the characteristic of being better suitable for the flue gas of a sintering machine or a pelletizing device. However, with the stricter environmental emission standards, the inherent efficiency of the electrostatic dust collector is difficult to meet the emission requirements, and even if the electrostatic dust collector is subjected to efficiency improvement and transformation, an ideal effect is difficult to achieve. Under the background, the bag-type dust removal is used for replacing electrostatic dust removal, and is innovative, and the bag-type dust removal has a remarkable advantage in removing fine particles, particularly in dust removal efficiency far higher than that of electrostatic dust removal.
Although the bag-type dust removal is easy to stick the bag and corrode the filter material when the flue gas is condensed, with the progress of the bag-type dust removal technology and the filter material and the prevention technical measure for the acid condensation of the flue gas, the applicant thinks that the bag-type dust removal and corrosion problems can be solved, and the bag-type dust removal of the flue gas of the sintering machine or the pelletizing device is possible.
The key of the multi-pollutant collaborative purification of the flue gas of the sintering machine or the pelletizing device is flue gas dust removal, so that the dust removal problem is solved, and the subsequent desulfurization and denitrification equipment can normally operate.
Disclosure of Invention
The invention provides a bag-type dust removal-based sintering machine (pellet) flue gas multi-pollutant collaborative purification system, aiming at the problems that the flue gas electrostatic dust removal efficiency of the existing sintering machine or pellet device is low, the emission is not up to standard, and the subsequent desulfurization and denitration equipment is blocked and scaled.
The technical solution of the invention is as follows: a sintered pellet flue gas multi-pollutant collaborative purification system based on bag type dust removal comprises a sintering machine or a pellet device, an acid mist eliminator, a bag type dust remover, a denitration reactor, an induced draft fan, a wet desulphurization device and a chimney, which are sequentially connected through a steel flue, and further comprises an ash circulation system;
the acid mist eliminator and the bag type dust collector are integrated devices, and the acid mist eliminator is arranged at an inlet of the bag type dust collector;
the acid mist eliminator comprises an impact disperser, a shell and a partition plate;
the ash circulation system adopts dustless hot flue gas circulation behind the draught fan, carries the powder in the bag collector ash bucket to the acid mist annihilator entry, and rethread striking formula deconcentrator disperses the powder, with entry flue gas homogeneous mixing, leans on the adsorption of powder to eliminate the acid mist in the flue gas.
According to the embodiment of the invention, the ash circulating system comprises a servo device, an ash conveying fan and a pipeline valve which are sequentially connected through an ash conveying pipeline. When the temperature of the flue gas is lower than the acid dew point, the ash circulating system is started, and the dust-free hot flue gas is used for conveying powder in the ash hopper to adsorb acid mist.
According to the embodiment of the invention, the impact disperser comprises a powder nozzle and an impact plate; the powder is dispersed by the impact plate after being sprayed out at high speed.
According to an embodiment of the invention, the denitration reactor is an ozone oxidation denitration device or other denitration device.
According to the embodiment of the invention, the wet desulphurization device is a spray absorption desulphurization device, and comprises a limestone/gypsum method, a lime method, a magnesium oxide method, a sodium-alkali method, an ammonia method wet desulphurization device and the like.
According to the embodiment of the invention, the bag type dust collector is a pulse dust cleaning type bag type dust collector and comprises a pre-charging bag type dust collector and an electric-bag composite dust collector; or a conventional bag type dust collector, and the filter material of the bag type dust collector is a filter bag which is high temperature resistant, acid and alkali resistant, corrosion resistant and dewing resistant.
The working principle of the system is as follows: the flue gas of the sintering machine or the pelletizing device is firstly dedusted by a bag type deduster, and then denitration and desulfurization are sequentially carried out, so that the purpose of the synergistic treatment of multiple pollutants in the flue gas is achieved; when the flue gas temperature of the sintering machine (pellet) is too low and condensation is generated, starting an ash circulating system, opening a pipeline valve of the ash circulating system, circulating the dust-free hot flue gas behind an induced draft fan by using an ash conveying fan, conveying powder in an ash hopper of a bag type dust collector to an inlet of an acid mist eliminator, dispersing the powder by using an impact disperser, uniformly mixing the powder with the inlet flue gas, and eliminating acid mist in the flue gas by virtue of the adsorption effect of the powder; and when the flue gas temperature of the sintering machine or the pelletizing device is higher than the acid dew point temperature, the ash circulating system is stopped.
The invention has the beneficial effects that: aiming at the flue gas dust removal of a sintering machine or a pelletizing device, a bag type dust collector is provided to replace an electrostatic dust collector, so that the dust collection efficiency in the flue gas is improved, the standard emission is met, the problems of blockage, scaling and the like of subsequent desulfurization and denitration equipment are avoided, and the stable and reliable operation of the desulfurization and denitration equipment is ensured. The proposed acid mist eliminator and ash circulation system can avoid corrosion and bag-sticking of the bag type dust collector. The bag type dust collector is used for replacing an electrostatic dust collector, and the engineering investment and the operating cost can be reduced. The system can be used for both new projects and reconstruction projects.
Drawings
FIG. 1 is a system diagram of the present invention.
FIG. 2 is a flow diagram of an ash circulation system.
Fig. 3 is a structural view of an acid mist eliminator.
In the figure: 1. sintering or pelletizing plants; 2. an acid mist eliminator; 3. a bag type dust collector; 4. a denitration device; 5. an induced draft fan; 6. a wet desulfurization unit; 7. a chimney; 8. a material servo; 9. an ash conveying fan; 10. a pipeline valve; 201. an impact disperser; 202. a housing; 203. a partition plate; 204. a powder nozzle; 205. and a strike plate.
Detailed Description
The invention is further described below with reference to the figures.
The bag-type dust removal-based collaborative purification system for multiple pollutants in the flue gas of the sintering machine or the pelletizing device can be used for a new project and a reconstruction project.
A bag-type dust removal-based collaborative purification system for multiple pollutants in flue gas of a sintering machine or a pelletizing device comprises a sintering machine or a pelletizing device 1, an acid mist eliminator 2, a bag-type dust remover 3, a denitration reactor 4, an induced draft fan 5, a wet desulphurization device 6 and a chimney 7 which are sequentially connected through a steel flue; the system also comprises an ash circulating system which comprises a servo device 8, an ash conveying fan 9 and a pipeline valve 10.
Flue gas of a sintering machine or a pelletizing device 1 is firstly dedusted by a bag type deduster 3, and then denitration by a denitration reactor 4 and desulfurization by a wet desulphurization device 6 are sequentially carried out; in order to eliminate acid condensation of the flue gas, an acid mist eliminator 2 is arranged at an inlet of a bag type dust collector 3, the bag type dust collector and the acid mist eliminator form an integrated device, dust-free hot flue gas circulation is carried out after an induced draft fan 5 is adopted, powder in an ash hopper of the bag type dust collector 3 is conveyed to the inlet of the acid mist eliminator 2, the powder is dispersed through an impact disperser 201 and is uniformly mixed with the inlet flue gas, and the acid mist in the flue gas is eliminated by means of the adsorption effect of the powder.
The acid mist eliminator 2 is composed of an impact disperser 201, a shell 202 and a partition plate 203, the impact disperser 201 is composed of a powder nozzle 204 and an impact plate 205, and the powder is dispersed by the impact plate 204 after being sprayed at high speed.
The ash circulating system comprises a servo device 8, an ash conveying fan 9 and a pipeline valve 10 which are sequentially connected through an ash conveying pipeline. When the temperature of the flue gas is lower than the acid dew point, the ash circulating system is started, and the dust-free hot flue gas is used for conveying powder in the ash hopper to adsorb acid mist.
The bag type dust collector 3 is a pulse dust cleaning type bag type dust collector, the bag type dust collector 3 can be a conventional bag type dust collector, a pre-charged bag type dust collector, an electric bag composite dust collector and the like, and a filter material of the bag type dust collector is a filter bag which is high temperature resistant, acid and alkali resistant and corrosion resistant.
The denitration reactor 4 is an ozone oxidation denitration device and the like; the ozone oxidation denitration device comprises a distributor, a mixer and an ozone generator.
The wet desulfurization device 6 is a spray absorption desulfurization device, and includes wet desulfurization methods such as a limestone/gypsum method, a lime method, a magnesium oxide method, a soda method, and an ammonia method.
A bag type dust removal-based collaborative purification system for multiple pollutants in flue gas of a sintering machine or a pelletizing device 1 firstly adopts a bag type dust remover 3 to remove dust, and then sequentially carries out denitration and desulfurization so as to achieve the purpose of collaborative treatment of multiple pollutants in flue gas; when the flue gas temperature of the sintering machine or the pelletizing device 1 is too low to generate condensation, an ash circulating system is started, a pipeline valve 10 of the ash circulating system is opened, dust-free hot flue gas after an induced draft fan 5 is circulated by an ash conveying fan 9, powder in an ash hopper of a bag type dust collector 3 is conveyed to an inlet of an acid mist eliminator 2, the powder is dispersed by an impact disperser 201 and is uniformly mixed with the inlet flue gas, and acid mist in the flue gas is eliminated by virtue of the adsorption effect of the powder; when the flue gas temperature of the sintering machine or the pelletizing device 1 is higher than the acid dew point temperature, the ash circulating system is stopped.
The above detailed description of the embodiments with reference to the drawings is only a preferred embodiment of the present invention, however, the present invention is not limited to the details of the above embodiments, and any modification and replacement (such as wet desulfurization using limestone/gypsum method, lime method, magnesium oxide method, soda process, ammonia method, etc.) within the spirit and principle of the present invention are within the protection scope of the present invention.

Claims (5)

1. A sintered pellet flue gas multi-pollutant collaborative purification system based on bag type dust removal comprises a sintering machine or pellet device (1), an acid mist eliminator (2), a bag type dust remover (3), a denitration reactor (4), an induced draft fan (5), a wet desulphurization device (6), a chimney (7), and an ash circulation system, wherein the sintering machine or pellet device, the acid mist eliminator, the bag type dust remover, the denitration reactor (4), the induced draft fan (5), the wet desulphurization device (6) and the chimney are sequentially connected through a; the system is characterized in that firstly, a bag type dust collector is adopted to remove dust from the sintering pellet flue gas, and then denitration and desulfurization are sequentially carried out; the acid mist eliminator (2) and the bag type dust collector (3) are integrated devices, and the acid mist eliminator (2) is arranged at the inlet of the bag type dust collector (3);
the acid mist eliminator (2) comprises an impact disperser (201), a shell (202) and a partition plate (203);
the ash circulating system comprises a servo device (8), an ash conveying fan (9) and a pipeline valve (10), which are sequentially connected through an ash conveying pipeline;
when the flue gas temperature of a sintering machine or a pelletizing device (1) is too low to generate condensation, an ash circulating system is started, a pipeline valve (10) of the ash circulating system is opened, dust-free hot flue gas behind an induced draft fan (5) is circulated by an ash conveying fan (9), powder in an ash hopper of a bag type dust collector (3) is conveyed to an inlet of an acid mist eliminator (2), the powder is dispersed by an impact disperser (201) and is uniformly mixed with inlet flue gas, and acid mist in the flue gas is eliminated by virtue of the adsorption effect of the powder; when the flue gas temperature of the sintering machine or the pelletizing device (1) is higher than the acid dew point temperature, the ash circulating system is stopped.
2. The system for the synergistic purification of the multiple pollutants in the flue gas of the sintered pellets based on the bag type dust removal as claimed in claim 1, wherein the impact disperser (201) comprises a powder nozzle (204) and an impact plate (205).
3. The system for the synergic purification of the multiple pollutants in the flue gas of sintered pellets based on bag type dust removal as claimed in claim 1, characterized in that the denitration reactor (4) is an ozone oxidation denitration device.
4. The system for the synergistic purification of the multiple pollutants in the flue gas of the sintered pellets based on the bag type dust removal as claimed in claim 1, wherein the wet desulphurization device (6) is a spray absorption desulphurization device, and comprises a limestone/gypsum method, a lime method, a magnesium oxide method, a soda process and an ammonia process wet desulphurization device.
5. The system for the collaborative purification of the sintered pellet flue gas multiple pollutants based on the bag type dust removal as claimed in claim 1, wherein the bag type dust remover (3) is a pulse ash removal bag type dust remover, and comprises a pre-charge bag type dust remover and an electric bag composite dust remover.
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CN202224058U (en) * 2011-07-30 2012-05-23 华电电力科学研究院 Desulfurization and dust removal device for sprayed supersaturation water quicklime powder
CN206444401U (en) * 2017-02-17 2017-08-29 重庆科蓝环保实业有限公司 A kind of flying dust flue gas combination purification system for burning city domestic garbage

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JP2003161428A (en) * 2001-11-22 2003-06-06 Mitsubishi Heavy Ind Ltd Exhaust gas processing unit of ash melting furnace

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Publication number Priority date Publication date Assignee Title
CN202224058U (en) * 2011-07-30 2012-05-23 华电电力科学研究院 Desulfurization and dust removal device for sprayed supersaturation water quicklime powder
CN206444401U (en) * 2017-02-17 2017-08-29 重庆科蓝环保实业有限公司 A kind of flying dust flue gas combination purification system for burning city domestic garbage

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