CN101445852A - Converter gas wet cooling and dedusting method - Google Patents
Converter gas wet cooling and dedusting method Download PDFInfo
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- CN101445852A CN101445852A CNA2007101681819A CN200710168181A CN101445852A CN 101445852 A CN101445852 A CN 101445852A CN A2007101681819 A CNA2007101681819 A CN A2007101681819A CN 200710168181 A CN200710168181 A CN 200710168181A CN 101445852 A CN101445852 A CN 101445852A
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- flue gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a converter gas wet cooling and dedusting method which is characterized in that the method comprises the following steps: 1) evaporative cooling: flue gas at the temperature of about 900 DEG C is cooled by evaporation; the water droplets of the flue gas are cooled by spraying and then mixed with hot flue gas, so that the temperature of the flue gas is further reduced to 70-80 DEG C after the evaporative cooling; 2) spray dedusting: the sprayed water droplets of the cooled flue gas are used for capturing dust particles, and the captured dust particles are discharged from a pollutant discharge outlet; the gas after the treatment of spray dedusting enters an annular scrubber; 3) dedusting by the annular scrubber: the water droplets are sprayed, so as to lead the water droplets to pass through an annular throat together with the dust-containing flue gas, then, the dust particles in the flue gas are captured when the flow rate of the flue gas is in the range of 80-120m/s. The method has the advantages that 1) the temperature and dust can be rapidly and greatly reduced; 2) power and water can be saved obviously; 3) the dedusting efficiency can be improved, so that the emission concentration of the flue gas can keep below 50mg/Nm<3>.
Description
Technical field
The present invention relates to the cooling dust removal process method of metallurgical furnace flue gas, particularly a kind of converter gas wet cooling and dedusting method.
Background technology
The flue gas that steel-making converter produces in smelting process, the concentration of dust concentration and carbon monoxide are all very high, but through recycling after the cooling dust removal process, have both protected environment, have also avoided energy dissipation simultaneously.At present, domestic purifying smoke of steel converter system adopts the two-stage venturi scrubber that flue gas is lowered the temperature and dust removal process more.
Wherein, the cooling dust-cleaning principle of first step Venturi meter is: when flue gas passed through the aditus laryngis part of Venturi meter, speed reached about 60 meter per seconds, formed bigger speed of relative movement with the water coolant that sprays at the aditus laryngis position, made water coolant atomized; Water coolant after the atomizing and high-temperature flue gas carry out heat and mass, and flue-gas temperature is reduced, the grit bump cohesion in water droplet and the air-flow simultaneously than volume particle size, thus reach thick dust separating purpose.The Venturi meter dust separating advantage of lowering the temperature is that temperature reduction performance is better, but that shortcoming is an equipment resistance is big, is about 3000～4000 handkerchiefs, and watt consumption is big, the water loss height.
The dust-cleaning principle of second stage Venturi meter is: when converter gas passes through Venturi meter aditus laryngis part, produce bigger and metastable gas-flow resistance loss, be compressed when making ash-laden gas flow through aditus laryngis and the flow velocity rising, flue gas and water carry out gas-vapor mix under the effect of water spray, grit is separated from air-flow, reached the purpose of flue gas ash removal.The fine or not key of Venturi meter dust removing effects is the separating power of Venturi meter aditus laryngis part to grit in the flue gas.Its sepn process be when ash-laden gas when the trunnion, air-flow is retracted the speed 80～120m/s that uprushes, and is provided with around the trunnion perpendicular to air-flow and the water jet that possesses certain hydraulic pressure to spray water in trunnion, makes gas and liquid produce the high speed relative movement.The liquid of ejection forms liquid film and tiny drop, and the liquid film drop breaks through the air film around the grit in the flue gas, by inertial impaction and delay, grit and drop liquid film is come in contact.Small grit passes through diffusion and contacts with drop, and the grit of humidification is cohesion increase mutually in collision, and the moisture grit after the increase (weightening finish) is separated dust by different dewatering types from flue gas, play smart dust separating purpose.Improve air-flow and drop liquid film and possess higher speed of relative movement V, reduce droplet dia d, could guarantee dust removing effects.The major equipment of secondary Venturi meter aditus laryngis is the RD valve, when operating mode is moved, because product performance and overall craft do not match, causes the V value little at present, and d is bigger, and dust removing effects is not very high.The unit of RD valve is many in addition, and the RD aditus laryngis easily stops up, aditus laryngis circulation area regulation range is little, and water consumption is bigger.
Summary of the invention
The purpose of this invention is to provide a kind of converter gas wet cooling and dedusting method, big with the watt consumption that solves existing method, the water loss height, unit is many, the shortcoming that the RD aditus laryngis easily stops up, aditus laryngis circulation area regulation range is little; The inventive method can be lowered the temperature fast significantly, saves power and water consumption significantly, can also improve efficiency of dust collection, guarantees that smoke emissioning concentration is at 50mg/Nm
3Below, reach advanced world standards.
The objective of the invention is to realize by following technical scheme.The present invention is a kind of converter gas wet cooling and dedusting method, it is characterized in that may further comprise the steps:
1) transpiration cooling and spraying and dedusting,
1-1) transpiration cooling, the flue gas that temperature is about 900 ℃ carries out transpiration cooling, by the shower cooling water droplet, described cooling water droplet is mixed with hot flue gas, carries out evaporative cooling, and described flue-gas temperature is reduced to 70-80 ℃;
1-2) spraying and dedusting captures grit with the transpiration-cooled flue gas of described process with the injection water droplet, and the water droplet that contains grit falls, and discharges from sewage draining exit; Gas behind spraying and dedusting enters Annular Space Scrubber;
2) water droplet is sprayed in Annular Space Scrubber dedusting, makes water droplet and the ash-laden gas aditus laryngis by Annular Space Scrubber,, in 80～120 meter per second scopes the grit in the flue gas is captured at flue gas flow rate.
At described step 1-1) in, the particle diameter of described cooling water droplet is in 100 microns.
At described step 1-2) in, the particle diameter of described injection water droplet is the 100-250 micron.
In described step 2) in, the particle diameter of described injection water droplet is the 100-250 micron.
In described step 2) in, the flue gas flow in the flue is controlled with the aperture of annular space aditus laryngis.
The aperture of described annular space aditus laryngis is self-regulating, and method is: control the aperture of annular space aditus laryngis according to the force value and the difference DV of the atmospheric value at scene of converter mouth, thereby control the flue gas flow in the flue; Feedback control DV all-the-time stable again.
The annular space aditus laryngis pressure-losses (the forward and backward pressure difference of finger ring crack aditus laryngis) is controlled at 100～150mbar.
In described step 2) in, the aperture of annular space aditus laryngis is to regulate by the vertical motion up and down of inner cone.
The present invention adopts transpiration cooling, spraying and dedusting, three steps of Annular Space Scrubber dedusting to the converter gas dust removal process of lowering the temperature continuously.
The transpiration cooling process is:
With water droplet and flue gas thorough mixing that lance ejection goes out, water droplet is subjected to thermal evaporation, takes away about heat more than 90% in the flue gas, and flue-gas temperature is reduced to about 70-80 ℃ rapidly, carries out spraying and dedusting then.In the transpiration cooling process, water droplet is controlled in 100 microns, makes water droplet and the flue gas can thorough mixing, and the water droplet overwhelming majority of ejection is heated and flashes to water vapour.In order to guarantee that water droplet and flue gas have sufficient mixing time, required flue gas flow rate is lower, is 4～5 meter per seconds, is about 1/12 of flow velocity in the Venturi meter.Because flow velocity significantly reduces, only need pressure 300～500 handkerchiefs to get final product, reduced watt consumption widely.And the Venturi meter cool-down method, the flue gas of sentencing high flow rate because of need at Venturi meter is with the water droplet atomization and vaporization, and the pressure that needs is 3000～4000 handkerchiefs, is much higher than 300～500 handkerchiefs of the present invention, and the water yield of its consumption, power are also much bigger.
The spraying and dedusting process is:
Continue to flow through transpiration-cooled flue gas, again through spraying and dedusting; Go out water droplet with nozzle ejection the grit than volume particle size in the flue gas is captured, form the dust-laden drop.Under gravity or centrifugal action, dust-laden droplets fall or stick on the equipment inwall is swept away by water, falls into device bottom, discharges through sewage draining exit; Flue gas after the cooling dedusting enters Annular Space Scrubber.The drop particle diameter that the spray process is sprayed is controlled at the 100-250 micron, and it is effective that it catches dirt, saved water.
The Annular Space Scrubber dust removal process is:
Nozzle ejection goes out water droplet, passes through the Annular Space Scrubber aditus laryngis with ash-laden gas, and flue gas flow rate is controlled in 80～120 meter per second scopes, fully the grit in the flue gas is captured, and makes the smoke emissioning concentration that purifies back gas be lower than 50mg/Nm
3
The vertical direction of aditus laryngis aperture by the inner cone of Annular Space Scrubber moves and regulates.Can utilize the pressure difference value method to regulate the aperture of control annular space aditus laryngis automatically.Evidence, the aperture of annular space aditus laryngis becomes the linear function relation basically with the air-flow that passes through.For example: in the process of bessemerizing, compare with the normal atmosphere of on-the-spot (the on-the-spot atmospheric value in the factory building) with the pressure that the sensor determination converter mouth is got, with the positive difference after the comparison as the DV raw data, control the aperture of annular space aditus laryngis with computer, thereby control flue gas flow in the flue; Feedback control DV all-the-time stable again, remain on little on the occasion of scope in.The annular space aditus laryngis pressure-losses (referring to that flue gas passes through the forward and backward pressure difference of annular space aditus laryngis) is controlled at 100～150mbar, to keep best flue gas flow.
In sum, the inventive method can be lowered the temperature and dedusting fast significantly, saves power consumption and water consumption again significantly, can improve efficiency of dust collection, quality, makes smoke emissioning concentration at 50mg/Nm
3Below.
Description of drawings
Fig. 1 is a workflow diagram of the present invention.
Fig. 2 is a work synoptic diagram of the present invention.
Code name among the figure:
1 first step dust removal installation, 2 interchanger, 3 nozzles, 4 nozzles
5 sewage draining exits, 6 smoke outlets, 7 overflow water seals, 8 nozzles
9 Annular Space Scrubbers (second stage dust removal installation), 10 annular space Venturi meters, 11 inner cones
Embodiment
As Fig. 1,2, the inventive method may further comprise the steps:
1) transpiration cooling and spraying and dedusting,
1-1) transpiration cooling is about 900 ℃ flue gas with temperature and sends into dust removal installation 1 (dust removal installation 1 is cylindrical member), carries out cooling and dedusting, with nozzle 3 shower cooling water droplets, described cooling water droplet is mixed with hot flue gas, carry out evaporative cooling, make flue-gas temperature be reduced to 70-80 ℃ rapidly; The particle diameter of the cooling water droplet of described ejection is in 100 microns;
1-2) spraying and dedusting will spray water droplet with nozzle 4 again through transpiration-cooled flue gas and capture grit, and the particle diameter that sprays water droplet is at the 100-250 micron; After capturing grit, the dust-containing water drippage is discharged from the sewage draining exit 5 of dust removal installation 1 bottom down; Between the inlet of interchanger 2 and equipment 1, overflow water seal 7 also is set, overflow water flows down along equipment 1 inwall, and the dust that invests the equipment inwall is swept away, and discharges through the sewage draining exit 5 of dust removal installation 1 bottom; Gas behind spraying and dedusting is discharged from the smoke outlet 6 of dust removal installation 1.Flue gas after the cooling dedusting is from entering Annular Space Scrubber 9.
2) Annular Space Scrubber dedusting, nozzle 8 ejects water droplet, and ash-laden gas is aditus laryngis by the taper annular space between annular space Venturi meter 10 and the inner cone 11, fully the grit in the flue gas is captured.
In Annular Space Scrubber 9, the aperture of aditus laryngis is adjustable by the vertical direction motion of inner cone 11, and flue gas flow rate is controlled to be in 80～120 meter per second scopes, fully the grit in the flue gas is captured, and makes the smoke emissioning concentration that purifies back gas be lower than 50mg/Nm
3
In the present embodiment, adopt the best aperture of control annular space aditus laryngis automatically, to satisfy job requirement.In the process of bessemerizing, difference DV after relatively controls the aperture that moving up and down of Annular Space Scrubber inner cone 11 finished best aditus laryngis according to force value that converter mouth is got and on-the-spot normal atmosphere, thereby control flue gas flow in the flue automatically, feedback control DV all-the-time stable again, it is little in scope that DV is remained on.The vertical direction of aditus laryngis aperture by the inner cone of Annular Space Scrubber moves and regulates.Utilize the pressure difference value method to regulate the aperture of control annular space aditus laryngis automatically, evidence, the aperture of annular space aditus laryngis becomes the linear function relation basically with the air-flow that passes through.
For example: in the process of bessemerizing, the force value of being got with the sensor determination converter mouth is 101000Pa, the normal atmosphere at on-the-spot (scene of measuring in the factory building) is 101300Pa, the two relatively, as the DV raw data, control the aperture of annular space aditus laryngis with the difference-300Pa after the comparison, thereby control flue gas flow in the flue with computer, with feedback control DV all-the-time stable, remain on little on the occasion of be 0～+ scope of 20Pa in.The annular space aditus laryngis pressure-losses is controlled at 100～150mbar, to keep best flue gas flow.Present embodiment is moving up and down with hydro-cylinder control inner cone 11.
Adopt the inventive method to carry out the flue gas cool-down dedusting at the converter scene, effect is as follows:
Smoke treatment amount: 75000Nm
3/ h
First step dust removal installation entrance flue gas temperature: 900 ℃
First step dust removal installation exit gas temperature: 72 ℃
First step dust removal installation water consumption: 100t/h
First step dust removal installation resistance: about 400Pa
Smoke emissioning concentration by the Purge gas behind the Annular Space Scrubber:＜50mg/Nm
3
And adopt the prior art venturi scrubber, and handle the flue gas of same flow, water consumption is about 200t/h; Equipment resistance is about 3000～4000 handkerchiefs, and the smoke emissioning concentration guarantee value of the Purge gas by the RD valve is lower than 100mg/Nm
3
Can find out that the advantage of the inventive method is: 1) fast significantly cooling, 2) save significantly power and usefulness The water yield, 3) the efficiency of dust collection height, 4) the simplified apparatus unit, 5) avoid aditus laryngis to stop up.
Claims (8)
1, a kind of converter gas wet cooling and dedusting method is characterized in that may further comprise the steps:
1) transpiration cooling and spraying and dedusting,
1-1) transpiration cooling, the flue gas that temperature is about 900 ℃ carries out transpiration cooling, by the shower cooling water droplet, described cooling water droplet is mixed with hot flue gas, carries out evaporative cooling, and described flue-gas temperature is reduced to 70-80 ℃;
1-2) spraying and dedusting captures grit with the transpiration-cooled flue gas of described process with the injection water droplet, and the water droplet that contains grit falls, and discharges from sewage draining exit; Gas behind spraying and dedusting enters Annular Space Scrubber;
2) water droplet is sprayed in Annular Space Scrubber dedusting, makes water droplet and ash-laden gas by the annular space aditus laryngis, in flue gas flow rate is 80 ~ 120 meter per second scopes, the grit in the flue gas is captured.
2, converter gas wet cooling and dedusting method according to claim 1 is characterized in that:
At described step 1-1) in, the particle diameter of described cooling water droplet is in 100 microns.
3, converter gas wet cooling and dedusting method according to claim 1 is characterized in that:
At described step 1-2) in, the particle diameter of described injection water droplet is the 100-250 micron.
4, converter gas wet cooling and dedusting method according to claim 1 is characterized in that: in described step 2) in, the particle diameter of described injection water droplet is the 100-250 micron.
5, converter gas wet cooling and dedusting method according to claim 1 is characterized in that: in described step 2) in, the flue gas flow in the flue is controlled with the aperture of annular space aditus laryngis.
6, converter gas wet cooling and dedusting method according to claim 1, it is characterized in that: the aperture of described annular space aditus laryngis is self-regulating, method is: control the aperture of annular space aditus laryngis according to the force value and the difference DV of the atmospheric value at scene of converter mouth, thereby control the flue gas flow in the flue; Feedback control DV all-the-time stable again.
7, converter gas wet cooling and dedusting method according to claim 6 is characterized in that:
The annular space aditus laryngis pressure-losses is controlled to be 100～150mbar.
8, converter gas wet cooling and dedusting method according to claim 5 is characterized in that: in described step 2) in, the aperture of annular space aditus laryngis is to regulate by the vertical motion up and down of inner cone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101681819A CN101445852A (en) | 2007-11-28 | 2007-11-28 | Converter gas wet cooling and dedusting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101681819A CN101445852A (en) | 2007-11-28 | 2007-11-28 | Converter gas wet cooling and dedusting method |
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| CN101445852A true CN101445852A (en) | 2009-06-03 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102059033A (en) * | 2010-12-21 | 2011-05-18 | 哈尔滨工程大学 | Condensation agglomeration trapping method and device of ultrafine particulate matter in combustion gas |
| CN102786952A (en) * | 2012-08-06 | 2012-11-21 | 山西鑫立能源科技有限公司 | Crude gas condensing device for coal pyrolyzing furnace |
| CN102851084A (en) * | 2011-06-30 | 2013-01-02 | 斯普瑞喷雾系统(上海)有限公司 | Coal gas semi-dry type cooling dust-removal system for primary flue gas of converter |
| CN105543441A (en) * | 2015-12-14 | 2016-05-04 | 苏州韵蓝环保科技有限公司 | Multi-grade annular gap washer system |
| WO2017089869A1 (en) | 2015-11-25 | 2017-06-01 | Briant Michel | Washing tower as heat exchanger for single energy recovery equipment from exhaust fumes |
| CN111889257A (en) * | 2020-06-29 | 2020-11-06 | 武汉钢铁有限公司 | Nozzle droplet particle size control method and device |
| CN114345049A (en) * | 2022-01-11 | 2022-04-15 | 南京钢铁股份有限公司 | Converter flue spraying control method for dynamically monitoring flue gas speed and temperature |
| CN118497447A (en) * | 2024-07-19 | 2024-08-16 | 山西新泰钢铁有限公司 | High-efficiency dust removing method for converter of steel mill |
-
2007
- 2007-11-28 CN CNA2007101681819A patent/CN101445852A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102059033A (en) * | 2010-12-21 | 2011-05-18 | 哈尔滨工程大学 | Condensation agglomeration trapping method and device of ultrafine particulate matter in combustion gas |
| CN102851084A (en) * | 2011-06-30 | 2013-01-02 | 斯普瑞喷雾系统(上海)有限公司 | Coal gas semi-dry type cooling dust-removal system for primary flue gas of converter |
| CN102851084B (en) * | 2011-06-30 | 2015-11-04 | 斯普瑞喷雾系统(上海)有限公司 | Converter flue gas coal gas semi-dry cooling and dedusting system |
| CN102786952A (en) * | 2012-08-06 | 2012-11-21 | 山西鑫立能源科技有限公司 | Crude gas condensing device for coal pyrolyzing furnace |
| CN102786952B (en) * | 2012-08-06 | 2014-06-11 | 山西鑫立能源科技有限公司 | Crude gas condensing device for coal pyrolyzing furnace |
| WO2017089869A1 (en) | 2015-11-25 | 2017-06-01 | Briant Michel | Washing tower as heat exchanger for single energy recovery equipment from exhaust fumes |
| CN105543441A (en) * | 2015-12-14 | 2016-05-04 | 苏州韵蓝环保科技有限公司 | Multi-grade annular gap washer system |
| CN111889257A (en) * | 2020-06-29 | 2020-11-06 | 武汉钢铁有限公司 | Nozzle droplet particle size control method and device |
| CN111889257B (en) * | 2020-06-29 | 2021-09-14 | 武汉钢铁有限公司 | Nozzle droplet particle size control method and device |
| CN114345049A (en) * | 2022-01-11 | 2022-04-15 | 南京钢铁股份有限公司 | Converter flue spraying control method for dynamically monitoring flue gas speed and temperature |
| CN118497447A (en) * | 2024-07-19 | 2024-08-16 | 山西新泰钢铁有限公司 | High-efficiency dust removing method for converter of steel mill |
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Open date: 20090603 |