CN101865609A - New technique for recovering heat energy of cooling waste gas - Google Patents
New technique for recovering heat energy of cooling waste gas Download PDFInfo
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- CN101865609A CN101865609A CN201010202844A CN201010202844A CN101865609A CN 101865609 A CN101865609 A CN 101865609A CN 201010202844 A CN201010202844 A CN 201010202844A CN 201010202844 A CN201010202844 A CN 201010202844A CN 101865609 A CN101865609 A CN 101865609A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000002912 waste gas Substances 0.000 title claims abstract description 24
- 238000001816 cooling Methods 0.000 title claims abstract description 20
- 238000005245 sintering Methods 0.000 claims abstract description 36
- 239000002918 waste heat Substances 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- MSSNHSVIGIHOJA-UHFFFAOYSA-N pentafluoropropane Chemical compound FC(F)CC(F)(F)F MSSNHSVIGIHOJA-UHFFFAOYSA-N 0.000 claims description 4
- 238000010248 power generation Methods 0.000 claims description 2
- 238000004134 energy conservation Methods 0.000 abstract 1
- 239000003344 environmental pollutant Substances 0.000 abstract 1
- 238000009766 low-temperature sintering Methods 0.000 abstract 1
- 231100000719 pollutant Toxicity 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- 239000002826 coolant Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 230000008676 import Effects 0.000 description 4
- 208000011580 syndromic disease Diseases 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000008234 soft water Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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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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- Manufacture And Refinement Of Metals (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a new technique for recovering the heat energy of cooling waste gas, which comprises the following technological processes: the sintering ore in a circular cooler is divided into a low-temperature section, an intermediate-temperate section and a high-temperature section; in the low-temperature section, a heat exchange is carried out between the air at ambient temperature with the sintering ore in the circular cooler, as shown in (6) of figure 1, the temperature of the air is raised to 120-250 DEG C, then the air is mixed with the waste gas discharged from a boiler and an evaporator to be served as a circulating hot air; a heat exchange is carried out in the intermediate-temperate section, as shown in (11) of figure 1, an organic Rankine cycle is applied in the intermediate-temperate section to recover waste heat; and a heat exchange is carried out in the high-temperate section, as shown in (4) of figure 1, a waste heat boiler is used in the high-temperature boiler to recover the heat of hot air. The invention makes full use of heated air circulation and Rankine cycle to recover waste low-temperature sintering heat, reduces the discharge of pollutants, increases heat recovery rate and the yield of the sintered product, and meets the requirements on energy conservation and emission reduction.
Description
Technical field
The present invention relates to a kind of new technology that reclaims heat energy of cooling waste gas, belong to metallurgical energy-conserving and emission-cutting technology field.
Background technology
Have the as follows substantially of sintering process now with the energy situation:
Existing sintering deposit waste heat recovery situation is as follows: cooling exhaust heat and sinter fume physics heat account for 39.9% of heat expenditure, present utilization hot gas sintering, hot wind ignition and the hot blast directly way of recycling such as mixed material of thawing, and build up waste heat boiler or afterheat boiler electricity-generating system, produce the indirect way of recycling of the steam-electric power of steam or utilization generation, sinter fume physics heat, cooling exhaust heat are utilized.But have such problem: organic efficiency is low, can support and utilize residual heat resources very big, too late 10% of recycling.In view of the characteristics of sintering circuit, be necessary to improve from technology, improve the first resource utilization rate to greatest extent, reduce solid consumption, gas consumption etc.; Make full use of secondary heat source, according to the characteristics comprehensive utilization of different working medium, the comprehensive utilization of low temperature waste gas heat in the improvement.
Summary of the invention
Technical problem to be solved by this invention is to improve organic efficiency, low temperature heat energy comprehensive utilization ratio in the raising.
The present invention reclaims the method and technology scheme of heat energy of cooling waste gas: reclaim heat energy of cooling waste gas in the central cooler and just be divided into three sections by temperature: low temperature, middle gentle high temperature are installed three fan housings respectively, and three fan housings are by hot air circulation pipe 11 and first blower fan 2 and second blower fan 3; In low-temperature zone, with the air under the environment temperature,, mix with boiler and evaporimeter discharging waste gas, as circulating air with sintering deposit heat exchange in the central cooler by the 3rd fan housing 6; In the middle-temperature section heat exchange: use the organic Rankine circulation to reclaim residual heat resources at middle-temperature section by second fan housing 5; In the high temperature section heat exchange:, utilize waste heat boiler to reclaim hot blast heat energy in high temperature section by first fan housing 4.
The hot blast temperature of being collected by first fan housing 4 is 350 ℃--450 ℃, produce 375 ℃, the overheated steam of 2.06Mpa through waste heat boiler and working-medium water heat exchange, and pushing turbine generates electricity.
The temperature of being collected hot blasts by second fan housing 5 is 250--350 ℃, produces 140 ℃, the superheated vapor of the R245fa of 1.93Mpa through evaporimeter and organic working medium R245fa heat exchange, drives organic turbine acting and generates electricity.
By the 3rd fan housing 6 with the air under the environment temperature, after sintering deposit heat exchange in the central cooler, temperature is increased to 120--250 ℃, mixes with boiler and evaporimeter discharging waste gas, and is required in order to the low-temperature receiver in pushing turbine generating and the organic turbine acting power generation process as circulating air.
Utilize the circulating generation of water and organic working medium.
Described circulating air surplus heat air quantity is big, and about 150 ℃ of temperature can directly be utilized the mixed material that thaws.
The method that the present invention reclaims heat energy of cooling waste gas is divided into high temperature section, middle-temperature section and low-temperature zone with sintering deposit in the central cooler as shown in Figure 1, and main waste heat recovery flow process is divided three processes, and is as follows:
Process 1: the heat of mixing air with process three is a cooling medium, as shown in Figure 1, at first section and sintering deposit forced heat-exchanging, collects hot blast by first fan housing, as the driving heat source of waste heat boiler.Because the heat of mixing air themperature that process three produces is more than 100 ℃, heat exchange air quantity one timing in process one can produce 350--450 ℃ hot blast.This part hot blast makes it absorb heat in boiler through waste heat boiler and soft water heat exchange, produces superheated vapor under certain pressure intensity, drives the steam turbine acting, the pushing generator generating.Specific embodiment such as Fig. 2.
Process 2: the heat of mixing air of process three can mix with the component environment air, through the automatic valve adjustment, make this part mixing air temperature suitable, pass through air channel, Forced Mixing absorption of air sintering deposit heat as cooling medium, collect by fan housing two again, as driving heat source, in evaporimeter,, produce superheated vapor with the organic working medium heat exchange, the acting of drive turbine, the pushing generator generating.Specific embodiment such as Fig. 3.
Process 3: surrounding air and sintering deposit as shown in Figure 1, are collected hot blast by the 3rd fan housing at the 3rd section forced heat-exchanging of central cooler, and temperature is controlled at 120--250 ℃.This part hot blast is as circulating air, for process one, process two provide cooling medium.In addition, superfluous low temperature waste gas causes compound ore deposit groove before second drum mixer and the head cloth, and the compound before the sintering is carried out preheating, and this part exhausted air quantity is big, about 150 ℃, mixture warm is reached more than 65 ℃ the dew point; Improve mixture temperature, can significantly reduce the bed of material and cross wet phenomenon, improve gas permeability, help sintering process, accelerate vertical sintering speed, improve productivity of sintering machine, thereby improve sintering deposit output.
The beneficial effect of the inventive method is: introduce new process, make full use of the circulation of hot air circulation and organic Rankine, reach the effect that reclaims low temperature heat energy to greatest extent, improves sintering efficient.
Description of drawings
Fig. 1 is a waste heat recovery new technological flow schematic diagram of the present invention.
1. central cooler, 2. first blower fan, 3. second blower fan, 4. first fan housing, 5. second fan housing, 6. the 3rd fan housing, 7. Electric air valve 8. through residual heat boiler for exchanging heat, 9. through the evaporimeter heat exchange, 10. directly utilizes (11) circulating air.
Fig. 2 is a waste heat boiler generating schematic diagram.
21, hot blast; 22, waste heat boiler; 23, steam turbine; 24, water pump; 25, flash vessel; 26, condenser; 27, cooling tower; 28, water charging system; 29 generators.
Fig. 3 is an organic Rankine circulating generation schematic diagram.
31, hot blast; 32, evaporimeter; 33, working medium pump; 34, butterfly valve; 35, mend working substance system; 36, condenser; 37, organic turbine; 38, generator; 39, cooling tower; 30, flash vessel.
The specific embodiment
Further specify flesh and blood of the present invention with example below, but content of the present invention is not limited to this.
Reclaim heat energy of cooling waste gas in the central cooler and just be divided into three sections by temperature: low temperature, middle gentle high temperature are installed three fan housings respectively, and three fan housings are by hot air circulation pipe 11 and first blower fan 2 and second blower fan 3; In low-temperature zone, with the air under the environment temperature, with sintering deposit heat exchange in the central cooler, temperature is increased to 120-250 ℃, mixes with boiler and evaporimeter discharging waste gas, as circulating air by the 3rd fan housing 6; In the middle-temperature section heat exchange: use the organic Rankine circulation to reclaim residual heat resources at middle-temperature section by second fan housing 5; In the high temperature section heat exchange: by first fan housing 4, utilize waste heat boiler to reclaim hot blast heat energy in high temperature section, and by following three processes realization:
Process one: the heat of mixing air (as Fig. 1 (11)) with process three is depicted as cooling medium, among Fig. 1, at sintering deposit high temperature section forced heat-exchanging, as among Fig. 1 4. shown in, collect hot blast by first fan housing, as the driving heat source of waste heat boiler, 8. as Fig. 1.Because the heat of mixing air themperature that process three produces more than 100 ℃, in heat exchange air quantity one timing of process one, 4. will be collected 350--450 ℃ hot blast among Fig. 1.This part hot blast through waste heat boiler Fig. 1 8. with boiler in the soft water heat exchange, make it absorb the hot blast heat, under certain pressure intensity, produce superheated vapor, drive the steam turbine acting, the pushing generator generating.Specific embodiment such as Fig. 2.
Process two: the heat of mixing air of process three can mix with the component environment air, through 7. Electric air valve adjustment of Fig. 1, makes this part mixing air temperature suitable, pass through the air channel as cooling medium, at the sintering deposit middle-temperature section, Forced Mixing absorption of air sintering deposit heat, as among Fig. 1 5. shown in, collect by fan housing two, as driving heat source, in evaporimeter with the organic working medium heat exchange, as Fig. 1 9. shown in, produce superheated vapor, drive the turbine acting, the pushing generator generating.Specific embodiment such as Fig. 3.
Process three: sintering deposit low-temperature zone forced heat-exchanging in surrounding air and the central cooler, as Fig. 1 6. shown in, collect hot blasts by fan housing three, temperature is controlled at 120--250 ℃.This part hot blast is as circulating air, as Fig. 1 (11), for process one, process two provide cooling medium.In addition, to Fig. 1 10., can directly be used for the material that thaws: superfluous low temperature waste gas causes compound ore deposit groove before second drum mixer and the head cloth, compound before the sintering is carried out preheating, this part exhausted air quantity is big, about 150 ℃, mixture warm is reached more than 65 ℃ the dew point; Improve mixture temperature, can significantly reduce the bed of material and cross wet phenomenon, improve gas permeability, help sintering process, accelerate vertical sintering speed, improve productivity of sintering machine, thereby improve sintering deposit output.
Embodiment 1 certain steel mill utilizes 600m
2Central cooler, installed one the cover technological process afterheat generating system shown in Figure 3 (ORCS).。2. import wind-warm syndrome of Fig. 3 process reaches 370 ℃, and this system adopts F-85 low boiling organic media circulating generation, installed capacity 14.8MW, and generated energy 12.5MW, operation ratio reaches about 85%.After the improvement, Fig. 2 is in parallel with Fig. 3 technology, makes full use of Fig. 1 (11) circulating air, power plant project installed capacity 20MW, and in-service factor is more than 90%. and improve resource and can support utilization ratio.
Two 130m of embodiment 2 certain steel mill
2Sintering machine, produce sintering deposit 2,490,000 t per year, 1 145m is respectively joined in the sintering deposit cooling
2Rotary forced-air cooler.Before the improvement, Fig. 1 process 1., 2. in the running, the low temperature hot blast of discharging is by 4. collecting, 8. produce steam through process, enter technological process acting generating shown in Figure 2 then, 2. import wind-warm syndrome of process is between 260-320 ℃ among Fig. 2, engineering installed capacity 5000KW, in-service factor less than 80% adopts Fig. 1 technology, add 5., 6., make full use of (11), and introduce Fig. 3 technological process, 2. import wind-warm syndrome of Fig. 2 process reaches about 400 ℃, about 300 ℃ of 2. import wind-warm syndrome of Fig. 3 process, except that providing technology needed 300,000 Nm for sintering machine
3Outside/h the hot blast, also produce 280,000 Nm
3The hot blast of/h is for directly utilizing.After the improvement, power plant project installed capacity 8000KW, in-service factor is more than 90%; Realize hot gas sintering, the hot blast mixed material that thaws, sintered ore rotary drum strength improves 2.24%, and the sintering deposit yield rate improves 0.67%; Save 4.80 ten thousand tons in mark coal year.
Claims (6)
1. method that reclaims heat energy of cooling waste gas, it is characterized in that: reclaim heat energy of cooling waste gas in the central cooler and just be divided into three sections by temperature: low temperature, middle gentle high temperature are installed three fan housings respectively, and three fan housings are by hot air circulation pipe 11 and first blower fan 2 and second blower fan 3; In low-temperature zone, with the air under the environment temperature,, mix with boiler and evaporimeter discharging waste gas, as circulating air with sintering deposit heat exchange in the central cooler by the 3rd fan housing 6; In the middle-temperature section heat exchange: use the organic Rankine circulation to reclaim residual heat resources at middle-temperature section by second fan housing 5; In the high temperature section heat exchange:, utilize waste heat boiler to reclaim hot blast heat energy in high temperature section by first fan housing 4.
2. the method for recovery heat energy of cooling waste gas according to claim 1, it is characterized in that: the hot blast temperature of being collected by first fan housing 4 is 350 ℃-450 ℃, produce 375 ℃, the overheated steam of 2.06Mpa, pushing turbine generating through waste heat boiler and working-medium water heat exchange.
3. the method for recovery heat energy of cooling waste gas according to claim 1, it is characterized in that: the temperature of collecting hot blast by second fan housing 5 is 250--350 ℃, produce 140 ℃, the superheated vapor of the R245fa of 1.93Mpa through evaporimeter and organic working medium R245fa heat exchange, drive organic turbine acting generating.
4. the method for recovery heat energy of cooling waste gas according to claim 1, it is characterized in that: by the 3rd fan housing 6 with the air under the environment temperature, after sintering deposit heat exchange in the central cooler, temperature is increased to 120--250 ℃, mix with boiler and evaporimeter discharging waste gas, required as circulating air in order to the low-temperature receiver in pushing turbine generating and the organic turbine acting power generation process.
5. the method for recovery heat energy of cooling waste gas according to claim 1 is characterized in that: the circulating generation that utilizes water and organic working medium.
6. the method for recovery heat energy of cooling waste gas according to claim 1 is characterized in that: described circulating air surplus heat air quantity is big, and about 150 ℃ of temperature can directly be utilized the mixed material that thaws.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010202844.6A CN101865609B (en) | 2010-06-18 | 2010-06-18 | New technique for recovering heat energy of cooling waste gas |
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| CN201010202844.6A CN101865609B (en) | 2010-06-18 | 2010-06-18 | New technique for recovering heat energy of cooling waste gas |
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| CN101865609A true CN101865609A (en) | 2010-10-20 |
| CN101865609B CN101865609B (en) | 2014-05-07 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101988804A (en) * | 2010-12-09 | 2011-03-23 | 宁波钢铁有限公司 | Device and method for drying blast furnace ores and coke groove by recycling residual heat of circular cooler |
| CN103033063A (en) * | 2012-12-28 | 2013-04-10 | 北京世纪源博科技股份有限公司 | Method for recovering waste heat of sintering flue gas |
| CN104807334A (en) * | 2015-05-13 | 2015-07-29 | 中冶北方（大连）工程技术有限公司 | System and method for utilizing low-temperature hot waste gas of circular cooler |
| CN105021050A (en) * | 2014-04-30 | 2015-11-04 | 宝山钢铁股份有限公司 | Device and method for reducing low-temperature smoke particulate matter emission in cold procedure of sinter ring |
| CN106931792A (en) * | 2015-12-30 | 2017-07-07 | 中冶长天国际工程有限责任公司 | The method and apparatus of central cooler waste gas comprehensive utilization |
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| CN101403571A (en) * | 2008-11-21 | 2009-04-08 | 中冶长天国际工程有限责任公司 | Circular cooler flue gas recycling method and system, and circular cooler |
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2010
- 2010-06-18 CN CN201010202844.6A patent/CN101865609B/en not_active Expired - Fee Related
Patent Citations (4)
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Non-Patent Citations (1)
| Title |
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| 《上海交通大学学报》 20060831 魏东红等 废热源驱动的有机朗肯循环系统变工况性能分析 第40卷, 第8期 2 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101988804A (en) * | 2010-12-09 | 2011-03-23 | 宁波钢铁有限公司 | Device and method for drying blast furnace ores and coke groove by recycling residual heat of circular cooler |
| CN101988804B (en) * | 2010-12-09 | 2012-11-14 | 宁波钢铁有限公司 | Device and method for drying blast furnace ores and coke groove by recycling residual heat of circular cooler |
| CN103033063A (en) * | 2012-12-28 | 2013-04-10 | 北京世纪源博科技股份有限公司 | Method for recovering waste heat of sintering flue gas |
| CN103033063B (en) * | 2012-12-28 | 2016-05-18 | 北京世纪源博科技股份有限公司 | Sinter fume exhaust heat recovering method |
| CN105021050A (en) * | 2014-04-30 | 2015-11-04 | 宝山钢铁股份有限公司 | Device and method for reducing low-temperature smoke particulate matter emission in cold procedure of sinter ring |
| CN104807334A (en) * | 2015-05-13 | 2015-07-29 | 中冶北方（大连）工程技术有限公司 | System and method for utilizing low-temperature hot waste gas of circular cooler |
| CN106931792A (en) * | 2015-12-30 | 2017-07-07 | 中冶长天国际工程有限责任公司 | The method and apparatus of central cooler waste gas comprehensive utilization |
| CN106931792B (en) * | 2015-12-30 | 2019-10-01 | 中冶长天国际工程有限责任公司 | The method and apparatus of ring cold machine exhaust gas comprehensive utilization |
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| CN101865609B (en) | 2014-05-07 |
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