CN101995166A - Metallurgical furnace dedusting waste heat recovery machine and method - Google Patents
Metallurgical furnace dedusting waste heat recovery machine and method Download PDFInfo
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- CN101995166A CN101995166A CN2009101844942A CN200910184494A CN101995166A CN 101995166 A CN101995166 A CN 101995166A CN 2009101844942 A CN2009101844942 A CN 2009101844942A CN 200910184494 A CN200910184494 A CN 200910184494A CN 101995166 A CN101995166 A CN 101995166A
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- waste heat
- heat
- metallurgical furnace
- dust
- furnace dedusting
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Abstract
The invention relates to a metallurgical furnace dedusting waste heat recovery machine and a metallurgical furnace dedusting waste heat recovery method. A technical scheme is that: the metallurgical furnace dedusting waste heat recovery machine comprises high-temperature smoke generating equipment, a draught fan and an exhaust cylinder which are connected with one another sequentially through pipelines. A waste heat utilization facility is placed behind a dust catcher, and the dust content of heat source smoke is low and is not taken into consideration when the equipment is designed and manufactured, so the space between heat exchange core unit fins can be designed to be small and dust-unloading, dust-cleaning and dust-conveying facilities are unnecessary; and the volume of the waste heat utilization facility is reduced, so the maintenance quantity of the waste heat utilization facility is reduced and the service life of the waste heat utilization facility is prolonged.
Description
Affiliated technical field
The invention belongs to metallurgical furnace dedusting waste heat recovery field, relate to the dedusting and the waste heat recovery of metallurgical furnace flue gas.
Background technology
Metallurgical furnace (electric furnace, converter, rotary hearth furnace) steel-making flue-gas temperature is very high, and generally about 1500 ℃, dust concentration reaches 25g/Nm to the temperature that enters pipeline after capturing
3, accounting for more than 70% of dust total amount less than the ash of 10um, Dust Capacity is big, and sticking and thin.Usually adopt the method for first heat exchange cooling (the heat exchange cooling method has: mechanical cooler heat exchange, spraying cooling heat transferring, residual heat boiler for exchanging heat etc.) back dedusting at present.There are many shortcomings in the method for elder generation's heat exchange cooling back dedusting:
1, dedusting after the mechanical cooler heat exchange: cooling-down effect is poor, and input gas temperature should not be greater than 500 ℃, and cooling is limited in scope, and the stifled easily ash of machine cooler tube wall causes the burning cloth bag, and system can't normally move.
2, dedusting behind the spraying cooling heat transferring: increase the content of water in the flue gas, cloth bag is hardened, also cause water and dust bonding easily, cause system equipment to stop up.
3, dedusting after the residual heat boiler for exchanging heat: owing to contain a large amount of dust in the flue gas, even sticking and thin dust also dust stratification, clogging can occur on the heat-pipe elements of light pipe, heat-pipe elements dust stratification, obstruction for the hoop finned tube are more serious, simultaneously in order to prevent the knot ash, heat exchange core parts spacing of fin is big in the UTILIZATION OF VESIDUAL HEAT IN facility, not only influence heat exchange efficiency, cause waste heat boiler steam production deficiency, even more serious is because the stifled ash of waste heat boiler, system's fluctuation of service, cause to smelt to produce and normally to carry out the maintenance of being forced to stop production.
Because above shortcoming, adopt many ash-blowing methods in the engineering: as shock-wave ash blowing, steam soot blowing, ball deashing etc. falls, but owing to dust carefully glues, and Dust Capacity is big, 1 ton of steel of every production will produce the 30kg dust, these purge modes produce little effect, and can't fundamentally solve dust stratification, blockage problem.
Summary of the invention
The purpose of this invention is to provide a kind of metallurgical furnace flue gas dedusting waste heat recovery new method.This method can not only reclaim the heat energy in the flue gas to greatest extent, and does not influence the stable and continuous of metallurgical furnace STEELMAKING PRODUCTION, can also obtain good dust removing effects, the little 10mg/Nm of dust concentration
3
The technical solution adopted in the present invention is as follows: metallurgical furnace waste heat recovery machinery and recovery method, comprise the high-temperature flue gas generation equipment, air-introduced machine, the aiutage that connect successively by pipeline, it is characterized in that: also be connected with hot precipitator, UTILIZATION OF VESIDUAL HEAT IN facility in turn between described high-temperature flue gas generation equipment and the air-introduced machine by pipeline, described UTILIZATION OF VESIDUAL HEAT IN facility is the fin tube heat heat exchange of heat pipe, described fin tube heat heat exchange of heat pipe does not have soot blower system, 1～4 millimeter of described finned tube heat pipe spacing of fin is provided with by the high temperature filter core in the described hot precipitator.
Beneficial effect of the present invention is: because after UTILIZATION OF VESIDUAL HEAT IN facility of the present invention was placed on deduster, the thermal source dust content was low, when manufacturing and designing, equipment can not consider, and therefore can the design of heat exchange core cell spacing of fin is very little; And need not unload ash, deashing, defeated grey facility; UTILIZATION OF VESIDUAL HEAT IN facility volume reduces, and maintenance reduces simultaneously, has also prolonged the service life of UTILIZATION OF VESIDUAL HEAT IN facility, and dust emission concentration is lower.Compared with prior art, the present invention has following advantage, economic effect:
1. reclaim fume afterheat to greatest extent, produce steam and be used for productive life.
2. satisfy the requirement of recycling economy, meet the national policy of energy-saving and emission-reduction.
3. fin tube heat heat exchange of heat pipe dust stratification does not stop up, and heat exchange efficiency improves 8～9 times.
4. save the soot blower system of finned tube exchanger, thereby reduced cost and operating cost.
5. finned tube exchanger is reliable, stable, satisfies the requirement of ordinary production.
6. adopt refractory ceramics filter-element dust collector, concentration of emission≤10mg/Nm
3
7. applied range, metallurgical furnace dedusting waste heat recovery all can be adopted.
In sum, this method adopts the dust collecting process of waste heat recovery after the first dedusting, and smoke dust discharge concentration is low, the steam production height, and it is low to install stable energy consumption.
Description of drawings
Fig. 1 is an apparatus structure schematic diagram of the present invention.
1. electric furnaces among the figure, 2. four hole water-cooled sliding sleeves, 3. combustion settling chamber, 4. deduster, 5. finned tube exchanger, 6. steam collector, 7. steam accumulator, 8. blower fan, 9. aiutage.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
This method is adopted in certain 90t/h steel-smelting electric furnace waste heat recovery, and as shown in Figure 1, the interior smoke discharging of electric furnace (1) is discharged by the 4th hole, sneaks into cold wind through four hole water-cooled sliding sleeves (2), enters combustion settling chamber (3) behind the burning CO gas; The effect of combustion settling chamber (3) is: reduce flue gas flow rate, make the big dust particle sedimentation of carrying in the flue gas, and suitably sneak into cold wind, finally burn CO gas, regulate exit gas temperature and be not more than 1500 ℃; The flue gas that is come out by combustion settling chamber (3) enters ceramic filter-element dust collector (4), and dust concentration is less than 10mg/Nm after dedusting
3Enter fin tube heat heat exchange of heat pipe (5) then and finish heat exchange with feedwater, temperature is reduced to about 150 ℃; Be pressed into aiutage (9) by main air blower (8) and enter atmosphere.Simultaneously, main feedwater produces steam after fin tube heat heat exchange of heat pipe (5) absorbs fume afterheat, enter steam collector (6), enter steam accumulator (7) by main steam line, be used for producing, live or generating for steam stable, continuous, that parameter meets customer requirements outside after regulating, finish waste heat recovery.The performance parameter of fin tube heat heat exchange of heat pipe: (pressure 1.25～1.7MPa, 189～204 ℃ of temperature, output 20t/h).
Also be connected with hot precipitator, UTILIZATION OF VESIDUAL HEAT IN facility in turn between described high-temperature flue gas generation equipment and the air-introduced machine by pipeline, described UTILIZATION OF VESIDUAL HEAT IN facility is the fin tube heat heat exchange of heat pipe, described fin tube heat heat exchange of heat pipe does not have soot blower system, 1～4 millimeter of described finned tube heat pipe spacing of fin is provided with by the high temperature filter core in the described hot precipitator.
Waste heat recovery after elder generation's dedusting, promptly earlier the high temperature dust flue gas being entered ceramic filter-element dust collector purifies, ceramic element in the deduster, generally can bear the long-term work temperature about 1000 ℃, high energy bears 1650 ℃ high temperature, and can bear that high temperature is oarse-grained to be washed away, therefore can the direct purification high-temperature flue gas, and do not need to do any preliminary treatment.Dust concentration after the purification is reduced to less than 10mg/Nm
3Become clean flue gas, do not need to handle the problem such as obstruction, deashing of dust.
The heat exchanger heat exchange element all adopts 1～4 millimeter heat pipe of spacing of fin, 8～9 times of heat exchange efficiencies have not only been improved, fecund steam, and the finned tube heat exchange element does not produce dust stratification, obstruction, corrosion phenomenon in heat transfer process, prolong 8 years service life of heat exchanger, and can guarantee stable and continuous normally the carrying out of metallurgical furnace STEELMAKING PRODUCTION.
Workflow of the present invention is: smoke discharging flow 25 * 10 in the electric furnace
4Nm
3/ h, 1500 ℃ of temperature, dust content 25g/Nm
3High-temperature flue gas behind refractory material peak load shifting in the insulation flue, is transported to hot precipitator, purifies back dust content 10mg/Nm
3, send into the UTILIZATION OF VESIDUAL HEAT IN facility, 1400～1510 ℃ of inlet temperatures, 130～150 ℃ of outlet temperatures by the guiding of power 800KW air-introduced machine, enter aiutage and enter atmosphere.Simultaneously, the UTILIZATION OF VESIDUAL HEAT IN facility produces steam (pressure 1.25～1.7MPa, 189～204 ℃ of temperature, output 20t/h) with the heat absorption in the high-temperature flue gas.
With 90t/h electric stove dust technology is example, and the device of apparatus of the present invention and first heat exchange cooling back dedusting relatively is described as follows:
Claims (5)
1. metallurgical furnace dedusting waste heat recovery machinery and recovery method, comprise the high-temperature flue gas generation equipment, air-introduced machine, the aiutage that are connected successively by pipeline, it is characterized in that: the method that connects waste heat recovery apparatus between described flue gas generation equipment and the air-introduced machine behind the employing elder generation connection deduster is implemented.
2. metallurgical furnace dedusting waste heat recovery machinery according to claim 1 and recovery method is characterized in that: described UTILIZATION OF VESIDUAL HEAT IN facility is the fin tube heat heat exchange of heat pipe.
3. metallurgical furnace dedusting waste heat recovery machinery according to claim 1 and recovery method is characterized in that: described fin tube heat heat exchange of heat pipe does not have soot blower system.
4. metallurgical furnace dedusting waste heat recovery machinery according to claim 1 and recovery method is characterized in that: 1～4 millimeter of described finned tube heat pipe spacing of fin.
5. metallurgical furnace dedusting waste heat recovery machinery according to claim 1 and recovery method is characterized in that: be provided with by the high temperature filter core in the described hot precipitator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101844942A CN101995166A (en) | 2009-08-17 | 2009-08-17 | Metallurgical furnace dedusting waste heat recovery machine and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101844942A CN101995166A (en) | 2009-08-17 | 2009-08-17 | Metallurgical furnace dedusting waste heat recovery machine and method |
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| CN101995166A true CN101995166A (en) | 2011-03-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101219A (en) * | 2013-04-12 | 2014-10-15 | 无锡市西漳环保设备有限公司 | Micro-filtration method for treating PM2.5 (Particulate Matter 2.5) micro-dust of electric furnace |
| CN110327706A (en) * | 2019-08-15 | 2019-10-15 | 戴涛 | A kind of industrial waste gas purifying processing unit utilized with Waste Heat Recovery |
| CN112066762A (en) * | 2020-08-21 | 2020-12-11 | 中国矿业大学 | Heat exchange device suitable for crude gas and use method thereof |
-
2009
- 2009-08-17 CN CN2009101844942A patent/CN101995166A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101219A (en) * | 2013-04-12 | 2014-10-15 | 无锡市西漳环保设备有限公司 | Micro-filtration method for treating PM2.5 (Particulate Matter 2.5) micro-dust of electric furnace |
| CN110327706A (en) * | 2019-08-15 | 2019-10-15 | 戴涛 | A kind of industrial waste gas purifying processing unit utilized with Waste Heat Recovery |
| CN112066762A (en) * | 2020-08-21 | 2020-12-11 | 中国矿业大学 | Heat exchange device suitable for crude gas and use method thereof |
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Application publication date: 20110330 |