CN110694399A - Method and system for treating steel slag flue gas - Google Patents
Method and system for treating steel slag flue gas Download PDFInfo
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- CN110694399A CN110694399A CN201911129802.1A CN201911129802A CN110694399A CN 110694399 A CN110694399 A CN 110694399A CN 201911129802 A CN201911129802 A CN 201911129802A CN 110694399 A CN110694399 A CN 110694399A
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- flue gas
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 239000003546 flue gas Substances 0.000 title claims abstract description 69
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 49
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 239000002893 slag Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000428 dust Substances 0.000 claims abstract description 74
- 239000007921 spray Substances 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000010521 absorption reaction Methods 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000005507 spraying Methods 0.000 claims abstract description 15
- 238000009628 steelmaking Methods 0.000 claims abstract description 5
- 238000000502 dialysis Methods 0.000 claims description 9
- 230000008030 elimination Effects 0.000 claims description 3
- 238000003379 elimination reaction Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000000746 purification Methods 0.000 abstract description 4
- 239000002912 waste gas Substances 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 230000002087 whitening effect Effects 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 description 11
- 238000001816 cooling Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 241001274961 Rubus repens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003897 fog Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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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
-
- 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
- B01D53/26—Drying gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a method and a system for treating steel slag flue gas, which comprises the following steps: conveying high-temperature liquid steel slag generated in steel making into a hot stewing pool, spraying water into the hot stewing pool to cool and pulverize the high-temperature liquid steel slag to obtain dust-containing steam, conveying the dust-containing steam to a spray tower through a pipe network, spraying the dust-containing steam in the spray tower to obtain dust-containing flue gas, dehydrating the dust-containing flue gas through a dehydrator to obtain dry flue gas, conveying the dry flue gas to a wet absorption tower through an induced draft fan, and discharging the dry flue gas into the atmosphere after dedusting and whitening of the dry flue gas by using the wet absorption tower; the invention achieves the ultralow standard of national requirement, namely the dust concentration is less than 10mg/m3Meets the requirement of deep purification of the waste gas of the steel slag, has good dust removal effect, low cost, safety, environmental protection and no pollution。
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the field of steel slag dust removal, and particularly relates to a method and a system for treating steel slag flue gas.
[ background of the invention ]
The purpose of the steel slag treatment is to finish the cooling, pulverization and magnetic separation of high-temperature liquid steel slag generated by a converter or an electric furnace in the steel-making process. The cooling process of steel slag treatment is accompanied with the generation of a large amount of smoke and dust, and how to treat the smoke and the dust is an important subject facing domestic iron and steel enterprises. At present, the mainstream process for treating the steel slag of domestic iron and steel enterprises comprises the following steps: the cooling modes of the hot splashing method, the hot stewing pool method, the rolling hot stewing method, the roller method and the air quenching method all have a water cooling link, and a large amount of smoke, namely a large amount of water vapor and other gases, is generated in the process and accompanied by dust impurities.
The dust content of the flue gas is more than 200 mg/cubic meter, the emission standard of the environmental protection department for the steel slag treatment process is less than 100 mg/cubic meter, and the ultralow emission standard released in 2018 is less than 10 mg/cubic meter. For the treatment of smoke dust, the current treatment mode of steel enterprises is as follows: the hot splashing method is not treated and directly discharged; the smoke dust generated by the hot stewing pool method is discharged after being sprayed, and can reach less than 100 mg/cubic meter; the rolling hot stewing method is sprayed and then discharged, and can reach below 50 mg/cubic meter; the emission of the drum method after spraying can reach below 50 mg/cubic meter; the air quenching method is not used for direct discharge. The method treats the smoke dust in the steel slag treatment process, reaches the ultralow emission standard issued by the national ministry of environmental protection, and has important significance for steel enterprises.
[ summary of the invention ]
The invention aims to provide a method and a system for treating steel slag flue gas, which aim to solve the problem that steel slag dust exceeds standard and cannot reach national ultra-low emission standard.
The invention adopts the following technical scheme: a method for treating steel slag flue gas comprises the following steps:
conveying the high-temperature liquid steel slag generated in steel making into a hot stewing pool,
spraying water into the hot stewing pool to cool and pulverize the high-temperature liquid steel slag to obtain dust-containing steam,
conveying the dust-containing steam to a spray tower through a pipe network,
spraying the dust-containing steam in a spray tower to obtain dust-containing flue gas,
dehydrating the dust-containing flue gas by a dehydrator to obtain dry flue gas,
conveying the dry flue gas to a wet absorption tower through a draught fan,
and (4) discharging the dry flue gas into the atmosphere after dedusting and white elimination by using a wet absorption tower.
Furthermore, a plurality of water spray guns are arranged around the inner wall of the spray tower in a circle, and the water spray cones of the water spray guns are intersected.
Furthermore, muddy water generated after the spray tower sprays the dust-containing steam is discharged to an external water treatment system through a pipeline.
A system for treating steel slag flue gas comprises:
a spray tower communicated with the corresponding thermal stewing pool through the corresponding pipeline,
a dehydrator which is communicated with the spray tower through a pipeline,
a wet absorption tower communicated with the dehydrator through a pipeline,
the spray tower is used for spraying dust-containing steam to obtain dust-containing flue gas, the dehydrator is used for dehydrating the dust-containing flue gas to obtain dry flue gas, and the wet absorption tower is used for filtering dust and water vapor in the dry flue gas through the dialysis device.
Furthermore, a plurality of water spray guns are arranged in the spray tower and are vertically arranged.
Furthermore, muddy water generated after the spray tower sprays the dust-containing steam is discharged to an external water treatment system through a pipeline.
Furthermore, a plurality of hot stewing ponds are arranged in a straight line.
Furthermore, each thermal stewing pond is communicated with the spray tower through a corresponding branch pipe and then through a main pipe.
Furthermore, the dehydrator discharges muddy water generated after the dehydration of the dust-containing flue gas to an external water treatment system through a pipeline.
Furthermore, two parallel rails are arranged on two sides of the hot stewing pond, at least one movable cover vehicle is arranged above the hot stewing pond, the movable cover vehicle is positioned on the rails, the movable cover vehicle is in a hammer shape with a small upper part and a large lower part, the left side and the right side of the movable cover vehicle are respectively in sliding connection with the two rails, the bottom of the movable cover vehicle is not sealed and is butted with an upper opening of the hot stewing pond, so that a cavity is formed between the hot stewing pond and the movable cover vehicle, and the movable cover vehicle is communicated with the spray tower through a pipeline.
The invention has the beneficial effects that: the high-temperature liquid steel slag is sequentially treated, then is subjected to dust-containing steam, dust-containing flue gas and dry flue gas, and finally is filtered by a wet absorption tower and then is discharged into the atmosphere, so that the ultra-low standard required by the state is achieved, namely the dust concentration is less than 10mg/m3The method meets the requirement of deep purification of the steel slag waste gas, and has the advantages of good dust removal effect, low cost, safety, environmental protection and no pollution.
[ description of the drawings ]
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: 1. a spray tower; 2. a dehydrator; 3. a wet absorption tower; 4. a thermal stewing pool; 5. the cover vehicle is moved.
[ detailed description ] embodiments
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a method for treating steel slag flue gas, which comprises the following steps:
step 1: and conveying the high-temperature liquid steel slag generated in the steel making process into a hot stewing pool 4.
Step 2: spraying water into the hot stewing pool 4 to cool and pulverize the high-temperature liquid steel slag to obtain dust-containing steam. The high-temperature liquid steel slag generated by the converter or the electric furnace reaches about 1200 ℃, the temperature of the high-temperature liquid steel slag needs to be reduced to about room temperature, and after a certain amount of water is sprayed, a large amount of dust-containing steam is generated when the water meets the high-temperature liquid steel slag.
And step 3: and conveying the dust-containing steam to the spray tower 1 through a pipe network.
And 4, step 4: and spraying the dust-containing steam in the spray tower 1 to obtain dust-containing flue gas, cooling the dust-containing steam in the spray tower 1 again, and further achieving the effect of dust reduction through spraying. Be provided with a plurality of water spray guns around 1 inner wall a week of spray column, the water smoke awl of a plurality of water spray guns is crossing, spouts quantitative cooling water, reaches the purpose of cooling, and great granule dust subsides through the action of gravity behind meetting water simultaneously, plays the effect of coarse dust removal, can produce muddy water behind the dust meets water after spray column 1 sprays, and the muddy water that spray column 1 produced after spraying dusty steam passes through the pipeline and arranges to outside water treatment system.
And 5: and dehydrating the dust-containing flue gas by a dehydrator 2 to obtain dry flue gas, and dehydrating the dust-containing flue gas subjected to coarse dust removal and temperature reduction by a spray tower 1 in the dehydrator 2 to obtain the dry flue gas.
Step 6: and conveying the dry flue gas to a wet absorption tower 3 through a draught fan.
And 7: the wet absorption tower 3 removes dust and eliminates white dry flue gas and then discharges the dry flue gas into the atmosphere, the dry flue gas in the wet absorption tower 3 horizontally flows in, the flow rate of the dust is close to zero, the particle size of the dust is increased under the working condition of 66.5% humidity, the dust is rapidly settled, the flow rate and the pressure of the dry flue gas are rapidly reduced, the dry flue gas forms dew drops to be cooperated with the dust settlement, the dry flue gas is discharged through an overflow port of the wet absorption tower 3, the dust concentration is less than 10mg/m3。
The invention also discloses a steel slag flue gas treatment system, which comprises a spray tower 1, a dehydrator 2 and a wet absorption tower 3, wherein the spray tower 1 is communicated to a corresponding hot stewing pool 4 through a corresponding pipeline, high-temperature liquid steel slag is contained in the hot stewing pool 4, and a plurality of hot stewing pools 4 are arranged in a straight line, as shown in figure 1. Each thermal stewing pond 4 is communicated with the spray tower 1 through a corresponding branch pipe and then through a main pipe. Spray column 1 is used for spraying the dusty steam and obtains dusty flue gas, be provided with a plurality of water spray guns around 1 inner wall a week of spray column, the water smoke awl of a plurality of water spray guns is crossing, spray column 1 passes through the pipeline to the outside water treatment system of muddy water row that dusty steam sprayed back production, dehydrator 2 is linked together through pipeline and spray column 1, dehydrator 2 is used for dehydrating the dusty flue gas and obtains dry flue gas, dehydrator 2 passes through the pipeline to the outside water treatment system of muddy water row that produces after the dehydration of dusty flue gas. The wet absorption tower 3 is communicated with the dehydrator 2 through a pipeline, and the wet absorption tower 3 is used for dedusting and whitening the dry flue gas.
Two parallel tracks are arranged on two sides of the thermal stewing pool 4, at least one movable cover vehicle 5 is further arranged above the thermal stewing pool 4, the movable cover vehicle 5 is located on the tracks, the movable cover vehicle 5 is in a hammer shape with a small upper part and a large lower part, the left side and the right side of the movable cover vehicle are respectively in sliding connection with the two tracks, the bottom of the movable cover vehicle 5 is not sealed, and is in butt joint with an upper opening of the thermal stewing pool 4, so that a cavity is formed between the thermal stewing pool 4 and the movable cover vehicle 5, and the movable cover vehicle 5 is communicated with the spray tower 1 through a pipeline. The track 1 is used for moving the covered vehicle 2 to move back and forth, and the movable covered vehicle 2 is used for enabling dust generated in the heat soaking pool 5 to rise along the cavity and to be collected in the inner cavity of the movable covered vehicle 2.
The invention collects the smoke dust generated in the process of treating the high-temperature liquid steel slag by adopting a pipe network and then intensively sprays and dehydrates the smoke dust, the dehydrated dry smoke gas enters the wet absorption tower 3, namely the spray tower 1, the dehydrator 2 and the wet absorption tower 3, and dust removal and white elimination are carried out in the wet absorption tower 3, so that the requirement of deep purification of the steel slag waste gas can be met, and the national ultra-low emission environmental protection requirement is met.
The wet absorption tower 3 adopted in the invention is produced by environment-friendly engineering Limited company of Scott of Snoo of Zhejiang, a dialysis device is arranged in the wet absorption tower 3 and is used for removing dust and water vapor in dry flue gas, most of dust and water vapor are liquefied or solidified and fall into a slurry pool after the dry flue gas is filtered by a plurality of layers of water layers in the dialysis device, and the wet absorption tower 3 can intelligently adjust the flow of a water pump according to the concentration, temperature and pressure in the absorption tower so as to control the dialysis capability of the dialysis device. The dialysis device mainly depends on the characteristic that low-temperature saturated flue gas or gas in a fully-sealed large-space gas-mode bin contains a large number of fine fog drops, the probability of collision between the dust particles and the fog drops is increased under the condition that the large number of fine fog drops follow the motion characteristic of the air flow, and the fog drops and the dust particles collide with a plurality of dialysis modules with the same damping under the action of the principle of linear motion of the air flow after being condensed; the liquid is converged into liquid under the action of redirection centrifugation of the dialysis module and flows back to the bottom of the fully-sealed large-space gas mould cabin under the action of self gravity; the method realizes the catching and removing of the tiny dust or dust and fog drops in the flue gas or gas by the principle, thereby achieving the separation and purification of the flue gas or gas and the fog drops and the dust.
Example 1
1 spray tower 11 seats
The diameter of the cylinder body is as follows: d5000
Water supply amount: 1240t/h
2 dehydrator 21
Height of the cylinder body: 15m
3 induced draft fan
Form (a): centrifugal fan
Rotating speed: 960r/min
4 wet absorption tower 3
TABLE 1 parameters of outlet flue gas after treatment in spray column and dehydrator
TABLE 2 flue gas parameters after treatment in spray column, dehydrator, wet absorption column
After the test, as shown in Table 2, the content of the flue gas dust treated by the system is less than 10mg/Nm3The content of the flue gas dust which reaches the national ultra-low emission standard and is only treated by the spray tower and the dehydrator is 25-30mg/Nm3Therefore, the system has remarkable effect.
Claims (10)
1. The method for treating the steel slag flue gas is characterized by comprising the following steps of:
conveying the high-temperature liquid steel slag generated by steel making into a hot stewing pool (4),
spraying water into the hot stewing pool (4) to cool and pulverize the high-temperature liquid steel slag to obtain dust-containing steam,
conveying the dust-containing steam to a spray tower (1) through a pipe network,
spraying the dust-containing steam in the spray tower (1) to obtain dust-containing flue gas,
dehydrating the dust-containing flue gas by a dehydrator (2) to obtain dry flue gas,
conveying the dry flue gas to a wet absorption tower (3) through a draught fan,
the dry flue gas is discharged into the atmosphere after dust removal and white elimination by utilizing a wet absorption tower (3).
2. The method for treating the steel slag flue gas as claimed in claim 1, wherein a plurality of water spray guns are arranged around the inner wall of the spray tower (1), and the water spray cones of the water spray guns intersect.
3. The method for treating the steel slag flue gas as claimed in claim 1 or 2, wherein the muddy water generated by spraying the dust-containing steam by the spray tower (1) is discharged to an external water treatment system through a pipeline.
4. A processing system of slag flue gas, characterized by, includes:
a spray tower (1) communicated to the corresponding heat stewing pool (4) through the corresponding pipeline,
a dehydrator (2) communicated with the spray tower (1) through a pipeline,
a wet absorption tower (3) communicated with the dehydrator (2) through a pipeline,
the wet absorption tower (3) is used for filtering dust and water vapor in the dry flue gas through a dialysis device.
5. The system for treating the steel slag flue gas as claimed in claim 4, wherein a plurality of water spray guns are arranged in the spray tower (1) and are vertically arranged.
6. The system for treating the steel slag flue gas as claimed in claim 5, wherein the muddy water generated by spraying the dust-containing steam by the spray tower (1) is discharged to an external water treatment system through a pipeline.
7. The system for treating the steel slag flue gas as claimed in claim 6, wherein the thermal stewing pond (4) is provided in plurality and arranged in a straight line.
8. The system for treating steel slag flue gas as claimed in claim 7, wherein each thermal stewing pond (4) is communicated with the spray tower (1) through a corresponding branch pipe and then through a main pipe.
9. The system for treating the steel slag flue gas as claimed in claim 8, wherein the dehydrator (2) discharges muddy water generated by dehydrating the dust-containing flue gas to an external water treatment system through a pipeline.
10. The system for treating the steel slag flue gas as claimed in any one of claims 4 to 9, wherein two parallel rails are arranged on two sides of the hot stewing pool (4), at least one movable cover vehicle (5) is arranged above the hot stewing pool (4), the movable cover vehicle (5) is positioned on the rails, the movable cover vehicle (5) is a hammer body with a small upper part and a large lower part, the left side and the right side of the movable cover vehicle are respectively connected with the two rails in a sliding manner, the bottom of the movable cover vehicle (5) is not closed, and is in butt joint with an upper opening of the hot stewing pool (4) so as to form a cavity between the hot stewing pool (4) and the movable cover vehicle (5), and the movable cover vehicle (5) is communicated with the spray tower (1) through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911129802.1A CN110694399A (en) | 2019-11-18 | 2019-11-18 | Method and system for treating steel slag flue gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911129802.1A CN110694399A (en) | 2019-11-18 | 2019-11-18 | Method and system for treating steel slag flue gas |
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| CN110694399A true CN110694399A (en) | 2020-01-17 |
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| CN201911129802.1A Pending CN110694399A (en) | 2019-11-18 | 2019-11-18 | Method and system for treating steel slag flue gas |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111773860A (en) * | 2020-06-05 | 2020-10-16 | 新兴河北工程技术有限公司 | Steel slag hot-braising and dedusting process and device |
| CN112915688A (en) * | 2021-02-07 | 2021-06-08 | 中建七局(上海)有限公司 | Automatic dust treatment system for construction engineering construction site |
| CN112933832A (en) * | 2021-02-01 | 2021-06-11 | 于萍 | Waste gas purification device and process in stainless steel slag treatment |
| CN113502360A (en) * | 2021-07-20 | 2021-10-15 | 北京中航天业科技有限公司 | Treatment system and treatment method of high-temperature steel slag |
| CN114669571A (en) * | 2022-03-16 | 2022-06-28 | 新兴铸管股份有限公司 | Steam collecting device and method for removing dust from steel slag hot-braising steam |
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| CN111773860A (en) * | 2020-06-05 | 2020-10-16 | 新兴河北工程技术有限公司 | Steel slag hot-braising and dedusting process and device |
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| CN112933832A (en) * | 2021-02-01 | 2021-06-11 | 于萍 | Waste gas purification device and process in stainless steel slag treatment |
| CN112915688A (en) * | 2021-02-07 | 2021-06-08 | 中建七局(上海)有限公司 | Automatic dust treatment system for construction engineering construction site |
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| CN114669571A (en) * | 2022-03-16 | 2022-06-28 | 新兴铸管股份有限公司 | Steam collecting device and method for removing dust from steel slag hot-braising steam |
| CN114669571B (en) * | 2022-03-16 | 2023-10-27 | 新兴铸管股份有限公司 | Vapor collecting device and method for steel slag heat braising vapor dust removal |
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Application publication date: 20200117 |