CN111632462A - Treatment method of water-containing flue gas of steel slag - Google Patents
Treatment method of water-containing flue gas of steel slag Download PDFInfo
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- CN111632462A CN111632462A CN202010523071.5A CN202010523071A CN111632462A CN 111632462 A CN111632462 A CN 111632462A CN 202010523071 A CN202010523071 A CN 202010523071A CN 111632462 A CN111632462 A CN 111632462A
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- flue gas
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- 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
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
- B01D51/02—Amassing the particles, e.g. by flocculation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
- B01D51/02—Amassing the particles, e.g. by flocculation
- B01D51/06—Amassing the particles, e.g. by flocculation by varying the pressure of the gas or vapour
- B01D51/08—Amassing the particles, e.g. by flocculation by varying the pressure of the gas or vapour by sound or ultrasonics
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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
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Abstract
The invention discloses a method for treating water-containing flue gas of steel slag, which comprises the following steps: the collected flue gas is subjected to wet dust removal and cooling, and then secondary fine dust removal is performed under the combined action of sound wave treatment, spray treatment and dehydration treatment. According to the invention, coarse particles in the flue gas are contacted with atomized water through the coarse washing and dust removal treatment, and larger dust-containing water drops are formed and discharged under the action of gravity. The flue gas after coarse dust removal utilizes the sound wave agglomeration principle to enable fine particles in the flue gas to collide and agglomerate for pretreatment under the action of sound waves. Spraying atomized water drops as seeds to become agglomerated and coagulated graduallyThe agglomerated fine dust is changed into dust-containing water drops, the dust-containing water drops continue to agglomerate and collide with each other, the dust-containing water drops agglomerated into larger dust-containing water drops are removed through dehydration treatment, and the dust removal efficiency can reach about 99.9%. After treatment, the concentration of the discharged flue gas can reach less than or equal to 10mg/Nm3。
Description
Technical Field
The invention relates to the field of emission treatment of water-containing flue gas generated in a steel slag treatment process. In particular to a method for treating water-containing flue gas generated in steel slag treatment.
Background
The steel slag is a subsidiary product of converter steelmaking, and the slag discharge amount of the converter steel is about 100-130Kg/t steel. The common techniques for treating the converter steel slag include a hot splashing method, a roller method, a pool closing method and a tank closing method. No matter which process treatment method is adopted, the smoke generated in the treatment process causes great harm to workshops and surrounding environment, damages the vegetation structure of the land and pollutes air and water sources. The latest environmental protection regulations require that the part of the smoke emission is organized to reach the standard from the unorganized emission, so the smoke emission must be collected, purified and discharged to reach the standard.
In the past, two modes of direct high-altitude discharge or discharge after dust in flue gas is treated by a spray washing mode are adopted, and the new discharge standard cannot be met. Then, a discharge mode of washing and dry dedusting is researched, specifically, the discharge mode comprises the steps of firstly carrying out wet pre-dedusting through water spraying, then carrying out dehydration on the water-containing flue gas through a solution dehydrator, and finally carrying out dry dedusting in a dry deduster (a bag deduster or a plastic sintered plate deduster), wherein the discharge mode can reach not more than 20mg/Nm3The requirements of (1).
Disclosure of Invention
The invention aims to solve the problems that flue gas generated in converter steel slag treatment processes such as a hot splashing method, a roller method, a tank stuffiness method and the like contains calcium and magnesium compounds and a large amount of water vapor, and the modes such as electric dust removal, cloth bag dust removal, plastic burning plate dust removal and the like are not suitable for direct application, and the invention is based on the establishment of the processes, abundant operation management practical experience and professional knowledge for many years, and is matched with the application of fluid simulation to actively research and innovate. Through continuous research and discussion and repeated demonstration, the method for ultralow emission of flue gas with practical value is finally created.
The invention provides a method for treating water-containing flue gas of steel slag, which comprises the following steps: the collected flue gas is subjected to wet dust removal and cooling, and then secondary fine dust removal is performed under the combined action of sound wave treatment, spray treatment and dehydration treatment.
According to the technical scheme, the flue gas is subjected to coarse dust removal and cooling through a wet method, part of water vapor and large-particle smoke dust in the flue gas is removed, and then fine particles in the flue gas are subjected to collision and condensation for pretreatment under the action of sound waves by utilizing the sound wave agglomeration principle; meanwhile, atomized water drops formed by spraying are used as seeds, so that agglomeration can be changed into condensation, agglomerated fine dust is changed into dust-containing water drops, the dust-containing water drops continue to agglomerate and collide with each other to be condensed into larger dust-containing water drops, the dust-containing water drops are removed immediately after dehydration treatment, and the dust removal efficiency can reach about 99.9%.
Optionally or preferably, in the method for treating the water-containing flue gas from steel slag, the fundamental frequency of sound wave of the sound wave treatment is 460-480 Hz. The sound wave generating device converts compressed gas energy into medium vibration and then converts the medium vibration into sound energy, and simultaneously drives fine particles in surrounding smoke to collide and agglomerate, the fundamental frequency of the sound wave has influence on the dust removal effect, namely the fundamental frequency of the sound wave can influence the agglomeration effect of the particles, and in practice, the fundamental frequency is 460-480Hz, so that the effect is better.
Optionally or preferably, in the treatment method of the water-containing flue gas from steel slag, the fundamental frequency of sound wave of the sound wave treatment is 470Hz, and the dust removal effect is optimal.
Optionally or preferably, in the method for treating the water-containing flue gas of steel slag, the sound wave treatment, the spray treatment and the dehydration treatment are completed in the same dust removing tower, and the spray treatment device is positioned above the sound wave treatment device.
Optionally or preferably, the method for treating the water-containing flue gas of steel slag further comprises a dewatering step after wet dust removal, and then the dewatering step is carried out with sound wave treatment and spraying treatment. The dehydration step can reduce the water content of the flue gas entering the subsequent sound wave treatment process, remove a part of dust-containing liquid drops, reduce the subsequent dust removal burden and improve the subsequent dust removal efficiency.
Optionally or preferably, in the method for treating the water-containing flue gas of steel slag, the dehydration is performed by using a multi-stage dehydration device. The double-baffle dehydration device is a double-baffle dehydrator, belongs to one type of straight-flow cyclone, and is internally provided with a plurality of concentric baffles, wherein the plurality of baffles equivalently increase the wall area of the device, reduce the thickness of a water film formed by water drops falling on the baffles, and further reduce entrainment in smoke entering the subsequent dust removal step.
Optionally or preferably, in the method for treating the water-containing flue gas of steel slag, the wet dust removal is performed by spray washing.
Optionally or preferably, in the method for treating the water-containing flue gas containing steel slag, the flue gas after the sound wave treatment and the spraying treatment is further subjected to dehydration treatment.
Optionally or preferably, in the method for treating the water-containing flue gas containing steel slag, the dehydration treatment is performed by using a cyclone dehydration device. The cyclone dehydration device is also called a centrifugal gas-liquid separator, and the flue gas can move downwards in an inclined manner in a centrifugal mode after entering the cyclone dehydration device; entrained dust-laden water droplets are separated out as a result of the reduced velocity; the separated liquid is discharged independently, and the dried and cleaned treated flue gas is discharged to a pipeline leading to a chimney from an outlet of the rotational flow dehydration device.
Compared with the prior art, the invention has the following beneficial effects:
the method of the invention firstly washes coarse dust removal treatment to make coarse particles in the flue gas contact with atomized water to form larger dust-containing water drops which are discharged through the action of gravity. The flue gas after coarse dust removal utilizes the sound wave agglomeration principle to enable fine particles in the flue gas to collide and agglomerate for pretreatment under the action of sound waves. And simultaneously, atomized water drops are sprayed to be used as seeds to gradually become agglomerated into condensed, so that the agglomerated fine dust is changed into dust-containing water drops, the dust-containing water drops continue to agglomerate and collide with each other, the dust-containing water drops agglomerated into larger dust-containing water drops are removed through dehydration treatment, and the dust removal efficiency can reach about 99.9%. After treatment, the concentration of the discharged flue gas can reach less than or equal to 10mg/Nm3。
Detailed Description
The technical solutions of the present invention are explained and illustrated in detail below with reference to specific embodiments so that those skilled in the art can better understand the present invention and implement the present invention.
The treatment method of the water-containing flue gas of the steel slag comprises the following steps:
(1) collecting the water-containing flue gas generated in the steel slag treatment by using a dust collecting hood, and sending the water-containing flue gas into a washing tower through a pipeline for coarse dust removal treatment. The inner wall of the washing tower is provided with a plurality of nozzles which spray atomized water, coarse particles in the flue gas contact the atomized water to form larger dust-containing water drops, and the dust-containing water drops are discharged through a lower drain pipe under the action of self gravity.
(2) The residual flue gas continuously enters the fine dust removal system through a pipeline: the device comprises a high-efficiency dust remover (namely a dust removal tower), wherein a multi-gear dehydration device is arranged at a flue gas inlet of the high-efficiency dust remover, a sound wave agglomeration mist catching device for generating sound waves is arranged at a position about 1-2 m above the flue gas inlet, and the fundamental frequency of the sound waves is set at 470 Hz. A fine spraying device (a plurality of nozzles can spray atomized water) is arranged 2-3.5m above the acoustic agglomeration mist catching device, and a dehydration treatment device is arranged at a proper distance above the fine spraying device.
In the high-efficiency dust remover, the flue gas after coarse dust removal is firstly subjected to a round of dehydration treatment by a multi-gear dehydration device to remove dust-containing liquid drops carried in a washing tower, and fine particles in the flue gas are collided and condensed to carry out pretreatment under the action of sound wave agglomeration of a sound wave agglomeration mist capturing device; meanwhile, atomized water drops are sprayed into the fine spraying device to serve as seeds, so that agglomeration can be changed into condensation, agglomerated fine dust is changed into dust-containing water drops, the dust-containing water drops continue to agglomerate and collide with each other to be condensed into larger dust-containing water drops, and the dust-containing water drops are removed through the uppermost dewatering device, so that the dust removal efficiency can reach about 99.9%. The treated qualified flue gas can be discharged through a diffusing chimney by a fan.
Example 1
The system is successfully applied to a flue gas purification system project of a 90-kiloton steel slag treatment line of a certain steel company Limited in a certain city. The steel company Limited builds two steel slag rolling crushing-waste heat pressing and hot disintegrating treatment systems of a steel plant, and the system mainly comprises two stages of steel slag rolling crushing and steel slag waste heat pressing and hot disintegrating. The rolling and crushing stage is mainly used for rapidly cooling and crushing the molten steel slag.
In the rolling and crushing stage, a large amount of flue gas is generated, the main components of the flue gas are air and water vapor, and the dust is mainly tiny dust particles generated in the rolling and crushing process of the steel slag. Pollutants generated by the hot slag treatment process are vapor mixed with dust, so that collected flue gas is subjected to wet dust removal and cooling, and then secondary fine dust removal is performed under the combined action of sound wave treatment, spray treatment and dehydration treatment. Ensuring the purifying effect and no mechanical water in the discharged flue gas.
The specific dust removal process is as follows: and (3) collecting the moisture-containing flue gas generated by the hot stewing slag through a dust hood, and sending the moisture-containing flue gas into a washing tower through a pipeline under the action of a draught fan to perform coarse dust removal treatment of wet dust removal and temperature reduction. The inner wall of the washing tower is provided with a plurality of nozzles which spray atomized water, coarse particles in the flue gas contact the atomized water to form larger dust-containing water drops, and the dust-containing water drops are discharged through a lower drain pipe under the action of self gravity. The surplus flue gas continues to get into high-efficient dust remover (being the gas wash tower) through the pipeline, and in high-efficient dust remover, flue gas after the coarse dust removal carries out a round of dehydration by the dewatering device that shelves again earlier, and the desorption is smugglied secretly the dusty liquid drop that comes in by the scrubbing tower in, and all the other flue gases are at sound wave processing apparatus: under the action of sound wave agglomeration of the sound wave agglomeration mist catching device (sound wave fundamental frequency is 470Hz), fine particles in the smoke collide with each other and are agglomerated for pretreatment; and meanwhile, spraying treatment is carried out, specifically, atomized water drops are sprayed by a fine spraying device to serve as seeds, so that agglomeration can be changed into condensation, the agglomerated fine dust is changed into dust-containing water drops, the dust-containing water drops continue to agglomerate and collide with each other, the dust-containing water drops are condensed into larger dust-containing water drops, the larger dust-containing water drops are removed by the uppermost dehydration treatment device, and the dust removal efficiency can reach about 99.9%. The treated qualified flue gas can be discharged through a diffusing chimney by a fan.
Two sets of steel slag rolling crushing-waste heat pressure hot stuffy treatment systems are respectively provided with one dust removal system, and the air volume of each system is 280000m3/h。
After the hot-test of the hot-stewed slag flue gas purification system of the steel company Limited, the debugging is advanced, the particulate matter emission concentration is detected on the premise of ensuring the dust collection effect, and the technological parameters are adjusted during production for 9 times in total.
The detection result can show that the final emission concentration of the flue gas is far less than 10mg/m3And the expected effect is achieved.
The inventive concept is explained in detail herein using specific examples, which are given only to aid in understanding the core concepts of the invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are included in the scope of the present invention.
Claims (8)
1. The method for treating the water-containing flue gas of the steel slag is characterized by comprising the following steps of: the collected flue gas is subjected to wet dust removal and cooling, and then secondary fine dust removal is performed under the combined action of sound wave treatment, spray treatment and dehydration treatment.
2. The method for treating the water-containing flue gas of steel slag as claimed in claim 1, wherein the fundamental frequency of the sound wave treatment is 460-480 Hz.
3. The method for treating the water-containing flue gas of steel slag according to claim 1, wherein the fundamental frequency of sound waves of the sound wave treatment is 470 Hz.
4. The method according to claim 1, wherein the sonication, the spraying and the dehydration are performed in the same dedusting tower, the spraying is performed above the sonication, and the dehydration is performed above the spraying.
5. The method for treating the water-containing flue gas of steel slag as claimed in claim 1, wherein the method further comprises a dewatering step after the wet dust removal, and the dewatering step is followed by the sound wave treatment and the spray treatment.
6. The method for treating the water-containing flue gas of steel slag as claimed in claim 5, wherein the dehydration is carried out by using a multi-stage dehydration device.
7. The method for treating the water-containing flue gas of steel slag as claimed in claim 1, wherein the wet dedusting is carried out by spray washing.
8. The method for treating the water-containing flue gas of steel slag as claimed in claim 1, wherein the dehydration treatment is carried out by using a cyclone dehydration device.
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| CN202010523071.5A CN111632462A (en) | 2020-06-10 | 2020-06-10 | Treatment method of water-containing flue gas of steel slag |
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| CN202010523071.5A CN111632462A (en) | 2020-06-10 | 2020-06-10 | Treatment method of water-containing flue gas of steel slag |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150109188A (en) * | 2014-03-19 | 2015-10-01 | 주식회사 대유위니아 | A Control Method of cleaning in use with air-washer |
| CN106215679A (en) * | 2016-09-23 | 2016-12-14 | 北京国电龙源环保工程有限公司 | A kind of multistage washing wet flue gas pollutant efficient removal integrated apparatus and method |
| CN207137534U (en) * | 2017-01-11 | 2018-03-27 | 南京宇行环保科技有限公司 | A kind of enhanced rotational flow dust-removing demister of coalescence |
| CN109536667A (en) * | 2017-09-22 | 2019-03-29 | 辽宁基伊能源科技有限公司 | A kind of Wetting once dust collection of converter gas cleaning integrated system |
| CN208786086U (en) * | 2019-01-15 | 2019-04-26 | 北京博鹏中科环保科技有限公司 | A kind of flue gas high-efficiency dust remover |
| CN109692541A (en) * | 2019-01-15 | 2019-04-30 | 北京博鹏中科环保科技有限公司 | A kind of flue gas high-efficiency dust remover |
| CN212383424U (en) * | 2020-06-03 | 2021-01-22 | 北京博鹏中科环保科技有限公司 | Flue gas ultralow emission system in slag treatment |
-
2020
- 2020-06-10 CN CN202010523071.5A patent/CN111632462A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150109188A (en) * | 2014-03-19 | 2015-10-01 | 주식회사 대유위니아 | A Control Method of cleaning in use with air-washer |
| CN106215679A (en) * | 2016-09-23 | 2016-12-14 | 北京国电龙源环保工程有限公司 | A kind of multistage washing wet flue gas pollutant efficient removal integrated apparatus and method |
| CN207137534U (en) * | 2017-01-11 | 2018-03-27 | 南京宇行环保科技有限公司 | A kind of enhanced rotational flow dust-removing demister of coalescence |
| CN109536667A (en) * | 2017-09-22 | 2019-03-29 | 辽宁基伊能源科技有限公司 | A kind of Wetting once dust collection of converter gas cleaning integrated system |
| CN208786086U (en) * | 2019-01-15 | 2019-04-26 | 北京博鹏中科环保科技有限公司 | A kind of flue gas high-efficiency dust remover |
| CN109692541A (en) * | 2019-01-15 | 2019-04-30 | 北京博鹏中科环保科技有限公司 | A kind of flue gas high-efficiency dust remover |
| CN212383424U (en) * | 2020-06-03 | 2021-01-22 | 北京博鹏中科环保科技有限公司 | Flue gas ultralow emission system in slag treatment |
Non-Patent Citations (1)
| Title |
|---|
| 陶天全主编: "《水泥工业粉磨工艺及设备》", 31 July 1992, 武汉工业大学出版社 * |
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