CN100480605C - Sintering machine cooling circulation exhaust gas residual heat utilization system - Google Patents
Sintering machine cooling circulation exhaust gas residual heat utilization system Download PDFInfo
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- CN100480605C CN100480605C CNB2007100111127A CN200710011112A CN100480605C CN 100480605 C CN100480605 C CN 100480605C CN B2007100111127 A CNB2007100111127 A CN B2007100111127A CN 200710011112 A CN200710011112 A CN 200710011112A CN 100480605 C CN100480605 C CN 100480605C
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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
It relates to a sintering circulation exhaust gas left heat utilization, especially a sintering cooling circulation exhaust gas left utilization system, composed of cooling air blast connected multi tube deduster, left heat boiler, thermal force oxygen remover, smoke electric control system, left heat boiler using high pressure left heat boiler and lower pressure left heat boiler formed high temperature dual pressure left heat boiler recovery system, high pressure left heat boiler connected to the deduster and waste gas output of the wind blast of the sintering machine, thermal deoxygen and low pressure left heat boiler, with it connected with the left heat recovery system, low pressure left heat boiler connected with the lower wind blaster of the sintering machine through draught fan, return wind pipe. It better uses exhaust gas, improves the energy utilization rate.
Description
Technical field
The invention belongs to sintering machine cycle gas UTILIZATION OF VESIDUAL HEAT IN field, relate in particular to a kind of sintering machine cooling circulation exhaust gas bootstrap system.
Background technology
The sintering circuit energy consumption is only second to ironmaking and occupies second in iron and steel enterprise, in the sintering total energy consumption, the sensible heat that cooling machine waste gas is taken away accounts for 20～28% of total energy consumption, and an energy-conservation important step of sintering circuit is recycled the waste heat that cooling machine waste gas is taken away.
But sintering waste heat is reclaimed nothing more than two kinds of methods in the past: 1. a kind of be the sintered discharge gas dedusting after waste heat boiler is reduced to waste gas below 200 ℃, tail gas is discharged in the atmosphere by chimney naturally by air-introduced machine then.2. another kind is that waste-heat recovery device (by boiler design) directly is placed in ring cold smoke cover top, and the waste gas after the recovery also is discharged in the atmosphere naturally by chimney.
The subject matter that exists in above-mentioned heat recovery process is: 1. the sintering dust granules is hard and concentration is big, more than two kinds of waste heat recovery modes all be that tail gas is directly emitted, this does not obviously meet environmental requirement; 2. in addition, sintered discharge gas is directly by waste heat recovery apparatus, and hard dust long term wear tube wall has reduced waste heat recovery apparatus service life.3. the way that in the past generally adopts a heat recovery boiler is only to reclaim sintering high temperature section waste gas residual heat (about 350 ± 50 ℃), and it is lower that low temperature waste gas waste heat recovery below 250 ℃ is used for the producing steam cost performance, therefore, will not reclaim traditionally.
On the other hand, owing to there is not the soft water pre-heating system, the water temperature that enters thermal deaerator is lower, so the steam that thermal deaerator consumed is more, causes energy waste.
Summary of the invention
The purpose of this invention is to provide a kind of sintering machine cooling circulation exhaust gas bootstrap system, the rate of recovery that the waste gas recovery exists in the prior art is low to solve, waste heat recovery apparatus is short service life, directly be discharged into tail gas in the atmosphere, pollute environmental problem, it has is energy-conservation environmental protection again, and the advantage that makes the energy obtain recycling.
The object of the present invention is achieved like this.
According to sintering machine cooling circulation exhaust gas bootstrap system of the present invention, comprise the multi-tube dust cleaner that is connected with cool wind box, waste heat boiler, thermal deaerator, exhaust piping, the flue gas electric-control system, it is characterized in that described waste heat boiler adopts the two pressure waste heat boiler recovery systems of the high temperature section of being made up of high pressure waste heat boiler and low pressure waste heat boiler, the waste gas inlet of its high pressure waste heat boiler links to each other with multi-tube dust cleaner, multi-tube dust cleaner is connected with bellows waste gas outlet on the sintering machine, the waste gas outlet of high pressure waste heat boiler links to each other with the exhaust gas inlet of low pressure waste heat boiler, the steam pipework of thermal deaerator links to each other with the steam pipework of low pressure waste heat boiler, the thermal deaerator feed-water inlet is connected with the waste gas residual heat recovery system of low-temperature zone, the waste gas outlet of low pressure waste heat boiler links to each other with air-introduced machine, this air-introduced machine is connected with bellows under the sintering machine by backwind tube, forms the waste gas circulation recycling system.The waste gas residual heat recovery system of described low-temperature zone is by softening water tank, deaerated feedwater preheater, the softening water pipe of deaerated feedwater preheater, deaerated feedwater preheater, smoke evacuation system are formed, the feed pipe of softening water tank links to each other with the deaerated feedwater preheater, demineralized water after the preheating of deaerated feedwater preheater directly links to each other with the water inlet of the thermal deaerator of high temperature section high pressure waste heat boiler, and the outlet pipe of thermal deaerator links to each other with the water inlet of high pressure boiler water supply end.
Described two residual neat recovering system of pressing is provided with the bypass chimney, at two pressure waste heat boiler recovery system gas approach pipelines two ends electrically operated valve is set.
Described flue gas electric-control system comprises instrument checkout gear and PLC control system: respectively be arranged on the multi-tube dust cleaner gateway, high pressure waste heat boiler gateway, the low pressure heat boiler outlet, the temperature instrument that the fume side Temperature Detector in air-introduced machine exit links to each other and to press, the overtemperature alarm at the low pressure heat boiler outlet place that is connected with the PLC controller respectively and with the chain control device of cold wind inlet valve overtemperature, the overtemperature alarm of multi-tube dust cleaner porch, on the sintering machine high-temp waste gas overtemperature alarm at bellows waste gas outlet place and and by-passing valve, the chain control device of deduster inlet overtemperature.
Adopt sintering machine cooling circulation exhaust gas heat recovery of the present invention system that sintered ring is cold or drawn by bellows on the sintering machine with 400 ± 50 ℃ of high-temp waste gas of cold circulation, through delivering to the high pressure waste heat boiler after the multi-tube dust cleaner dedusting, high-temp waste gas is after the high pressure residual heat boiler for exchanging heat after the dedusting, form high steam, the waste gas of being discharged by the high pressure waste heat boiler enters the low pressure waste heat boiler, through the low pressure waste heat boiler EGT is further lowered the temperature again, by the cold wind inlet valve EGT is reduced to below 150 ℃, and then the cooling air that temperature is lower than 150 ℃ sends back in the following bellows of central cooler with air-introduced machine, the cooling air passes sinter bed cooling sintering deposit, heat the cooling air simultaneously and become high-temp waste gas, this high-temp waste gas is drawn by last bellows, thereby form the waste gas circulation recycling system, rather than discharge the exhaust in the atmosphere, such system had both reclaimed waste heat, had eliminated atmosphere pollution again.The steam of thermal deaerator is supplied with by the steam of low-pressure boiler, the thermal deaerator feedwater is the soft water after being handled by water softening plant, after the deaerated feedwater preheater preheating of low-temperature zone, guide in the thermal deaerator, in thermal deaerator, form 90 ℃～110 ℃ soft water, as the feedwater of high pressure waste heat boiler, improved the thermal efficiency of high pressure waste heat boiler.
Compare with original technology, the present invention has following advantage:
Because the present invention is provided with deduster before waste heat boiler, prolonged the service life of waste heat boiler device systems, not only can high efficiente callback high temperature sintering ring cold or with the heat energy in the cold cycle gas, can make full use of simultaneously low temperature heat energy wherein again, make full use of the waste heat of sinter cooler, in addition the low-temperature zone waste heat is recycled, and deaerated feedwater is carried out preheating, reduce the oxygen-eliminating device steam consumption, thereby saved the energy.And, improved rate of energy greatly with the waste gas circulation utilization, obtained the high economic benefit and the social benefit of environmental protection.Why the present invention is designed to two pressure waste heat boilers with waste heat boiler, is because when manufacturer required steam to be incorporated into the power networks, the high temperature section EGT can not fall very lowly; But EGT can be even lower after adopting two pressure waste heat boilers, and but also heat supply power of the steam oxygen-eliminating device that the low pressure waste heat boiler produces uses, because of the used steam of oxygen-eliminating device is low-pressure steam, adopt the high steam to need through a cover depressurizing system with vapour, solved oxygen-eliminating device needs draw high steam from the high pressure waste heat boiler with vapour problem effectively for oxygen-eliminating device.
Low-temperature zone waste gas heat utilization system is set, in low-temperature zone 20 ℃ soft water after being preheating to about 70 ℃, the deaerated feedwater preheater of low-temperature zone is guided to oxygen-eliminating device, the used low-pressure steam of oxygen-eliminating device is supplied with by the high temperature section low-pressure boiler, soft water about 104 ℃ after the deoxygenation is as the feedwater of high-pressure boiler, after the preheating of high-pressure boiler preheater, deliver in the drum of high-pressure boiler, concentrate and separate the high pressure waste heat boiler is guided in the back by down-comer evaporimeter, the steam water interface that produces arrives drum through tedge, become saturated vapor after the secondary separation, directly deliver to the user by pipeline.
In addition, at boiler maintenance or furnace shutdown period, in order not influence SINTERING PRODUCTION, described two residual neat recovering systems of pressing are provided with the bypass chimney, at two pressure residual neat recovering system gas approach pipelines two ends electrically operated valve are set.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the A portion enlarged side view of Fig. 1.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
Referring to accompanying drawing 1,2, sintering machine cooling circulation exhaust gas heat recovery of the present invention system, comprise be connected with cool wind box 10 by multi-tube dust cleaner 13, waste heat boiler, thermal deaerator 2, exhaust piping 1, the flue gas electric-control system, it is characterized in that described waste heat boiler adopts the two pressure waste heat boiler recovery systems of the high temperature section of being made up of high pressure waste heat boiler 4 and low pressure waste heat boiler 6, the waste gas inlet of its high pressure waste heat boiler 4 links to each other with multi-tube dust cleaner 13, multi-tube dust cleaner 13 is connected with bellows 10 waste gas outlets 9 on the sintering machine 16, the waste gas outlet of high pressure waste heat boiler 4 links to each other with the exhaust gas inlet of low pressure waste heat boiler 6, the steam pipework of thermal deaerator 2 links to each other with the steam pipework 5 of low pressure waste heat boiler 6, thermal deaerator 2 feed-water inlets are connected with the waste gas residual heat recovery system of low-temperature zone, the waste gas outlet of low pressure waste heat boiler 6 links to each other with air-introduced machine 7, this air-introduced machine 7 is connected by 16 times bellows 17 of backwind tube 8 and sintering machine, form the waste gas circulation recycling system, the waste gas residual heat recovery system of described low-temperature zone is by softening water tank 14, water pipe, deaerated feedwater preheater 11, smoke evacuation system is formed, the feed pipe of softening water tank 14 links to each other with deaerated feedwater preheater 11, the outlet pipe 12 of deaerated feedwater preheater 11 directly links to each other with the water inlet of the thermal deaerator 2 of high temperature section high pressure waste heat boiler, and the outlet pipe 3 of thermal deaerator 2 links to each other with the water inlet of high-pressure boiler 4 to water end (W.E.).
Described two residual neat recovering system of pressing is provided with the bypass chimney, at two pressure waste heat boiler recovery system gas approach pipelines two ends electrically operated valve 15 is set.
Described flue gas electric-control system comprises instrument checkout gear and PLC control system: respectively be arranged on multi-tube dust cleaner 13 gateways, high pressure waste heat boiler 4 gateways, 6 outlets of low pressure waste heat boiler, the temperature instrument that the fume side Temperature Detector in air-introduced machine 7 exits links to each other and to press, the overtemperature alarm in low pressure waste heat boiler 6 exits that are connected with the PLC controller respectively and with the chain control device of cold wind inlet valve overtemperature, the overtemperature alarm of multi-tube dust cleaner 13 porch, on the sintering machine 16 the high-temp waste gas overtemperature alarm at bellows 10 waste gas outlet places and with by-passing valve 18, the chain control device of multi-tube dust cleaner inlet overtemperature.
Adopt sintered ring of the present invention cold or be with cold cycle gas heat recovery system, sintered ring is cold or drawn by the sintering bellows with 400 ± 50 ℃ of the high-temp waste gas of cold circulation, through delivering to the high pressure waste heat boiler after the deduster dedusting, high-temp waste gas is after the high pressure residual heat boiler for exchanging heat after the dedusting, form high steam, the waste gas of being discharged by the high pressure waste heat boiler enters the low pressure waste heat boiler, through the low pressure waste heat boiler EGT is further lowered the temperature again, by the cold wind inlet valve EGT is reduced to below 150 ℃, and then the waste gas that temperature is lower than 150 ℃ sends back in the central cooler bellows with air-introduced machine, the thermal deaerator feedwater is supplied with by the water outlet of low-temperature zone waste gas residual heat recovery system, in thermal deaerator, form 90 ℃～110 ℃ deoxygenation soft water, feed water as the high pressure waste heat boiler, so move in circles the waste gas circulation utilization, improve rate of energy greatly, obtained the high economic benefit and the social benefit of environmental protection.
Claims (2)
1, a kind of sintering machine cooling circulation exhaust gas bootstrap system, comprise the multi-tube dust cleaner that is connected with cool wind box, waste heat boiler, thermal deaerator, exhaust piping, the flue gas electric-control system, it is characterized in that described waste heat boiler adopts the two pressure waste heat boiler recovery systems of the high temperature section of being made up of high pressure waste heat boiler and low pressure waste heat boiler, the waste gas inlet of its high pressure waste heat boiler links to each other with multi-tube dust cleaner, multi-tube dust cleaner is connected with bellows waste gas outlet on the sintering machine, the waste gas outlet of high pressure waste heat boiler links to each other with the exhaust gas inlet of low pressure waste heat boiler, the steam pipework of thermal deaerator links to each other with the steam pipework of low pressure waste heat boiler, the thermal deaerator water inlet is connected with the waste gas residual heat recovery system of low-temperature zone, the waste gas outlet of low pressure waste heat boiler links to each other with air-introduced machine, this air-introduced machine is connected with bellows under the sintering machine by backwind tube, form the waste gas circulation recycling system, the waste gas residual heat recovery system of described low-temperature zone is by softening water tank, the deaerated feedwater preheater, the softening water pipe of deaerated feedwater preheater, smoke evacuation system is formed, the feed pipe of softening water tank links to each other with the deaerated feedwater preheater, the softening water pipe of deaerated feedwater preheater directly links to each other with the water inlet of thermal deaerator, and the outlet pipe of thermal deaerator links to each other for the water inlet of water end (W.E.) with the high pressure waste heat boiler.
2, sintering machine cooling circulation exhaust gas bootstrap system according to claim 1 is characterized in that described pair of pressure waste heat boiler recovery system is provided with the bypass chimney, at two pressure waste heat boiler recovery system gas approach pipelines two ends electrically operated valve is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100111127A CN100480605C (en) | 2007-04-27 | 2007-04-27 | Sintering machine cooling circulation exhaust gas residual heat utilization system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100111127A CN100480605C (en) | 2007-04-27 | 2007-04-27 | Sintering machine cooling circulation exhaust gas residual heat utilization system |
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| CN101042281A CN101042281A (en) | 2007-09-26 |
| CN100480605C true CN100480605C (en) | 2009-04-22 |
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| CNB2007100111127A Active CN100480605C (en) | 2007-04-27 | 2007-04-27 | Sintering machine cooling circulation exhaust gas residual heat utilization system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101655320B (en) * | 2009-09-15 | 2011-01-05 | 东北大学 | Recycling and utilization method of residual heat resources in sintering process and device thereof |
| CN108655383B (en) * | 2017-03-29 | 2020-02-18 | 鞍钢股份有限公司 | System and method for recovering waste heat of damaged hot metal ladle |
| CN108827009A (en) * | 2018-07-23 | 2018-11-16 | 易平 | Repetitive sequence circulation preheating device |
| CN114887409A (en) * | 2022-04-26 | 2022-08-12 | 成都易态科技有限公司 | Method for efficiently combining waste heat utilization, dust removal and denitration of high-temperature flue gas |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4536211A (en) * | 1982-05-18 | 1985-08-20 | Sumitomo Metal Industries, Ltd. | Waste gas circulation method and system for sintering apparatus |
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- 2007-04-27 CN CNB2007100111127A patent/CN100480605C/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4536211A (en) * | 1982-05-18 | 1985-08-20 | Sumitomo Metal Industries, Ltd. | Waste gas circulation method and system for sintering apparatus |
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