CN201281548Y - Low-temperature flue gas waste heat utilization system for sintered cooling machine of steel works - Google Patents
Low-temperature flue gas waste heat utilization system for sintered cooling machine of steel works Download PDFInfo
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- CN201281548Y CN201281548Y CNU2008201322360U CN200820132236U CN201281548Y CN 201281548 Y CN201281548 Y CN 201281548Y CN U2008201322360 U CNU2008201322360 U CN U2008201322360U CN 200820132236 U CN200820132236 U CN 200820132236U CN 201281548 Y CN201281548 Y CN 201281548Y
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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
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Abstract
The utility model discloses a low-temperature fume surplus heat utilization system for a sinter cooler of an iron and steel plant, comprising a sinter forced-draft cooler, a surplus heat boiler and a blower; wherein, the sinter forced-draft cooler is communicated with the surplus heat boiler by a fume channel, and the fume is drawn to the surplus heat boiler by the blower; the surplus heat boiler comprises a medium-temperature surplus heat boiler and a low-temperature surplus heat boiler; the inlet end of the medium-temperature surplus heat boiler is communicated with the high-temperature section of the sinter forced-draft cooler by the fume channel; the inlet end of the low-temperature surplus heat boiler is communicated with the medium-temperature section of the sinter forced-draft cooler by the fume channel; the outlet end of the low-temperature surplus heat boiler is communicated with a draft fan, and the fume is emitted to the atmosphere by the draft fan. As an independent fume full-cycle medium-temperature surplus heat boiler system is arranged in the utility model, the operational parameter of the surplus heat boiler can be improved; the steam generating quantity, the pressure and the temperature of the surplus heat boiler are stablized; the heat caused by the low-temperature fume in the medium-temperature section of the sinter forced-draft cooler can be effectively recycled.
Description
Technical field
The utility model relates to a kind of flue gas waste heat recovery system, relates more specifically to steel works sintering blowing-type cooling machine low-temperature flue gas bootstrap system.
Background technology
In the sintering deposit production process of steel plant, particularly sintering deposit is 150～400 ℃ a low-temperature flue gas by discharging big amount temperature in the sintering blowing-type cooler cooling procedure, thereby wastes the energy of a large amount of recyclable utilizations.The tradition bootstrap system is in sintering blowing-type cooler high temperature section simple and easy waste heat boiler to be installed to produce low-pressure steam, uses for SINTERING PRODUCTION technology and heating, life.This bootstrap system inefficiency causes residual heat resources effectively stably not recycle.Although bootstrap system had had remarkable improvement in recent years, also there are problems, as waste heat boiler steam production, pressure, temperature instability, often produce the situation that does not reach design load.And the main cause that causes this situation is to be subjected to due to the SINTERING PRODUCTION technology instability and the distinctive regularity of distribution of sintering blowing-type cooler flue-gas temperature.
Existing various sintering blowing-type cooling machine low-temperature flue gas bootstrap systems can obtain by following brief introduction understanding.Sintering blowing-type cooling machine low-temperature flue gas bootstrap system except boiler circuit configuration on have the certain difference, the main difference of these systems is in the configuration of flue gas system and waste heat boiler.
The open type flue gas system
The open type flue gas system is the most traditional a kind of bootstrap system, sees Fig. 1.This system also is the residual neat recovering system that present sintering blowing-type cooler generally adopts.Waste heat boiler 3 is directly installed by this system above sintering blowing-type cooler 1 high temperature section.Flue gas passes through waste heat boiler 3 by air blast 2 pressure of sintering blowing-type cooler, enters atmosphere after the heat exchange.This system is simple, but its steam production, temperature and pressure are low, and also unstable, the thermal efficiency is low.The open type flue gas system also can be provided with air-introduced machine at the heat boiler outlet place, and the flue gas that is cooled directly enters atmosphere.
The semi-open type flue gas system
The semi-open type flue gas system, i.e. partial fume circulation and partial fume enter the flue gas system of atmosphere, are a kind of bootstrap systems that development in recent years is got up, and see Fig. 2.This system is after to be exactly sintering blowing-type cooler 1 high temperature section flue gas by sintering blowing-type cooler air blast 2 entered waste heat boiler 3 and carried out heat exchange by flue, extract out by air-introduced machine 4, divide two-way afterwards, one the tunnel is that the flue gas that is cooled enters atmosphere, and another road is that the flue gas that is cooled is sent sintering blowing-type cooler 1 back to by circulating fan 5.
As can be seen, this system is better than simple open system from the configuration of flue gas system.It is the flue gas foldback that is cooled of the part knot blowing-type cooler that flashes back, and can improve and the flue-gas temperature of stable high temperature section, has improved the heat transfer boundary condition of waste heat boiler, has improved steam parameter, and producing steam can generate electricity.Its shortcoming is because after entering waste heat boiler after the flue gas mixing of high temperature section, and have only partial fume to be sent back to sintering blowing-type cooler, make the flue-gas temperature that enters waste heat boiler reduce, often cause waste heat boiler actual operation parameters off-design value, can not produce a desired effect.The influence of sintering blowing-type cooler load fluctuation in addition, this depart from particularly serious.
The complete alternation system
The complete alternation system also is a kind of bootstrap system that adopts in recent years, sees Fig. 3.This system is exactly that the flue gas that is cooled was all sent sintering blowing-type cooler 1 back to by circulating fan 4 after sintering blowing-type cooler 1 high temperature section flue gas entered waste heat boiler 3 heat exchange by sintering blowing-type cooler air blast 2 by flue.
This system has improved flue gas to a certain extent, has improved heat transfer boundary condition, and the steam parameter height of generation can be used for generating electricity.But also there are some defectives in it.Because this system all returns the flue gas that is cooled to sintering blowing-type cooler, though can improve and the flue-gas temperature of stable high temperature section, but the temperature of middle-temperature section flue gas is also improved thereupon, make the cooling effect of sintering blowing-type cooler be affected, promptly sintering blowing-type cooler has certain influence to the effect of cooling material.Same complete alternation system also exists part circulation and the similar problem of part open type flue gas system.
Also has a kind of flue gas waste heat recovery system, see Fig. 4 for details, this system is the high temperature section of sintering blowing-type cooler 1, the middle-temperature section flue gas is entered a waste heat boiler 3 respectively by different flues by sintering blowing-type cooler air blast 2 high temperature heat transfer zone and low-temperature heat exchange district.High-temperature flue gas is through heat exchange, when high-temperature flue-gas be reduced to the low-temperature flue gas temperature near the time mix, enter the low-temperature heat exchange district then jointly, the flue gas that is cooled is sent into atmosphere through air-introduced machine 4.This system has improved high, two sections surplus heat outputs of flue gas of middle-temperature section because waste heat boiler has adopted high temperature heat transfer zone and low-temperature heat exchange district.But the high temperature section flue gas is not sent back to sintering blowing-type cooler, thus high temperature section flue-gas temperature instability, and do not have raising, when sintering blowing-type cooler operation fluctuation, the operational factor of waste heat boiler is difficult to keep stabilizes and increases, and can cause the not good of heat exchange effect, is difficult to reach design load.
In sum, present existing various sintering blowing-type cooling machine low-temperature flue gas bootstrap system ubiquity fluctuations of service, the actual motion value does not reach design load, sintering blowing-type cooler splash material, and being difficult to assurance does not influence shortcomings such as original production technology.
According to sintering blowing-type cooler flue-gas temperature distribution situation, be divided into high temperature section, middle-temperature section and low-temperature zone usually, every section temperature range generally is respectively 250～350 ℃, 150～250 ℃ and 100～150 ℃.If adopt the mode of flue gas recirculation, the said temperature regularity of distribution will change, and make the temperature of high temperature section, middle-temperature section and low-temperature zone increase, and particularly the temperature of middle-temperature section will have raising significantly.
The utility model content
The utility model is based on and proposes on the basis that the sintering blowing-type cooler flue-gas temperature regularity of distribution is understood in depth, and purpose is a kind of sintering cooling machine low-temperature flue gas bootstrap system that proposes in order to solve the problems of the technologies described above conscientiously.During this system directly introduces the flue gas of sintering blowing-type cooler high temperature section by flue after the warm residual heat boiler for exchanging heat, after the circulating fan suction, the bellows of sending sintering blowing-type cooler bottom back to; After the low-temperature flue gas of middle-temperature section is introduced the heat exchange of low temperature exhaust heat boiler,, enter the mode of atmosphere through after the induced draft blower withdraws.
The feature of native system is middle temperature flue gas and low-temperature flue gas to be introduced the middle temperature waste heat boiler and the low temperature exhaust heat boiler of separate setting respectively, also is the modification of semi-open type flue gas recirculation system.
According to a specific embodiment of steel works sintering cooling machine low-temperature flue gas bootstrap system of the present utility model, this system comprises the sintering blowing-type cooler with air blast, waste heat boiler and air blast; Sintering blowing-type cooler is communicated with waste heat boiler by flue, by air blast flue gas is sent into waste heat boiler; Warm waste heat boiler and low temperature exhaust heat boiler during described waste heat boiler comprises, the arrival end of warm waste heat boiler is communicated with by the high temperature section of flue with described sintering blowing-type cooler in described, and its port of export is communicated with the cold motivation of described sintering by the flue that is provided with circulating fan; The arrival end of described low temperature exhaust heat boiler is communicated with by the middle-temperature section of flue with described sintering blowing-type cooler, and its port of export is communicated with atmosphere.Owing to be provided with warm afterheat boiler system in the fully independently flue gas complete alternation, promptly can improve the operational factor of waste heat boiler, also can stablize the steam production of waste heat boiler; And the independent flue gas open circulation low temperature exhaust heat steam generator system that is provided with, the heat of the low-temperature flue gas of sintering blowing-type cooler middle-temperature section is reclaimed effectively, heat energy recovery rate can improve 20% at least, make residual heat resources utilization maximization, simultaneously can guarantee not influence sintering process production again, temperature of charge is raise.
More specifically, described sintering blowing-type cooler is divided into smoke-box and following smoke-box, is respectively arranged with pressure automatic adjusting device in smoke-box and the following smoke-box on described, can effectively avoid the phenomenon of sintering blowing-type cooler splash material to take place.
More specifically, be communicated with described in the flue of warm heat boiler outlet end and described sintering blowing-type cooler be one or more pipeline.
The bootstrap system that the utility model proposes is based on a kind of completely new concept, avoided the influence of above-mentioned unfavorable factor effectively, production steam that can be efficient, stable, thereby realize making full use of sintering blowing-type cooler fume afterheat resource, and improve sintering blowing-type cooler fume afterheat resource utilization.
Waste heat boiler device described in the utility model adopts modularized design, has guaranteed workmanship and installation rate.Device described in the utility model can be adjusted device shaped and size flexibly according to field condition, makes design, installation and maintenance bring great convenience.
In warm waste heat boiler can economizer, evaporimeter and superheater be set according to the needs of system design; The low temperature exhaust heat boiler is provided with economizer and evaporimeter.Waste heat boiler also can be according to field condition, and the combination of warm waste heat boiler and low temperature exhaust heat boiler is arranged in making, also can dispersed placement.
Middle temperature waste heat boiler and low temperature exhaust heat boiler in the utility model, can adjust device shaped and size flexibly according to field condition, make design, installation and maintenance bring great convenience, and owing to can adopt modularized design, guarantee workmanship and installation rate, can be applied to the sintering blowing-type cooler of all size.
System advantage described in the utility model is as follows:
(1) heat recovery rate height.
The heat recovery rate of system described in the utility model can improve at least 20% than other system.
(2) waste heat boiler steam production, pressure, temperature stabilization.
System described in the utility model is owing to adopted middle temperature flue gas and low-temperature flue gas to introduce the middle temperature waste heat boiler and the low temperature exhaust heat boiler of separate setting respectively, it also is the separate arranged side by side comprehensive flue gas recirculation of the circulatory system and open system system, make steam production, pressure, the temperature stabilization of waste heat boiler, and parameter is improved.
(3) regulate flexibly.
System described in the utility model carries out flue gas pressures respectively at the upper and lower smoke chamber of sintering blowing-type cooler and regulates automatically, can effectively prevent to return the hypertonia of flue gas and the situation of the splash material that produces.
(4) can adapt to various field conditions.
Separate middle temperature waste heat boiler and low temperature exhaust heat boiler described in the utility model, can arrange according to the field condition combination, also can dispersed placement, can adjust device shaped and size flexibly according to field condition, make design, installation and maintenance bring great convenience.
(5) modularized design.
Device described in the utility model can adopt modularized design, has guaranteed workmanship and installation rate.
Description of drawings
Fig. 1 is the structural representation of an example of steel works sintering cooling machine low-temperature flue gas bootstrap system in the prior art, immediate boiling flue gas recirculation system;
Fig. 2 is the structural representation of another example of steel works sintering cooling machine low-temperature flue gas bootstrap system in the prior art, i.e. semi-open type flue gas recirculation system;
Fig. 3 is the structural representation of another example of steel works sintering cooling machine low-temperature flue gas bootstrap system in the prior art, i.e. enclosed flue gas recirculation system;
Fig. 4 is the structural representation of another example of steel works sintering cooling machine low-temperature flue gas bootstrap system in the prior art, immediate boiling flue gas recirculation system (waste heat boiler is set);
Fig. 5 is the structural representation of an embodiment of steel works sintering cooling machine low-temperature flue gas bootstrap system of the present utility model, i.e. semi-open type flue gas recirculation system (warm waste heat boiler and low temperature exhaust heat boiler in being provided with respectively).
The specific embodiment
Below in conjunction with the drawings and specific embodiments the technical solution of the utility model is further described.
According to the utility model and sintering blowing-type cooler temperature distributing rule, the high temperature section flue-gas temperature is in 300～450 ℃ of scopes, and the middle-temperature section flue-gas temperature is in 150～300 ℃ of scopes.The middle-temperature section flue-gas temperature increases than the open type flue gas system.For this reason, the utility model is considered to some extent to the setting of flue gas system.
A specific embodiment according to steel works sintering cooling machine low-temperature flue gas bootstrap system of the present utility model, this system comprises the sintering blowing-type cooler with air blast, this sintering blowing-type cooler is communicated with waste heat boiler by the pipeline that is arranged on its enclosed hood, by air blast flue gas is sent into waste heat boiler.Waste heat boiler in the utility model comprises separate middle temperature waste heat boiler and low temperature exhaust heat boiler.The arrival end of warm waste heat boiler is communicated with by the high temperature section of flue with described sintering blowing-type cooler in described, and its port of export is communicated with the cold motivation of described sintering by the flue that is provided with circulating fan; By the air blast in the sintering blowing-type cooler with high-temperature flue gas warm waste heat boiler in flue is sent into, through in after the warm residual heat boiler for exchanging heat, extract the bellows of sending sintering blowing-type cooler bottom back to out through flue by circulating fan.The arrival end of described low temperature exhaust heat boiler is communicated with by the middle-temperature section of flue with described sintering blowing-type cooler, and its port of export is communicated with atmosphere;
As shown in Figure 5, this system comprises sintering blowing-type cooler 1, and it has air blast 2; Warm waste heat boiler 3 and low temperature exhaust heat boiler 5 during the waste heat boiler of this system comprises, in the arrival end of warm waste heat boiler 3 be communicated with by the port of export of flue with the high temperature section of sintering blowing-type cooler 1, the port of export of middle temperature waste heat boiler 3 is communicated with the following smoke-box of the cold motivation 1 of described sintering by the flue that is provided with circulating fan 4; The arrival end of low temperature exhaust heat boiler 5 is communicated with by the port of export of flue with the middle-temperature section of described sintering blowing-type cooler 1, and the port of export of low temperature exhaust heat boiler 5 is communicated with atmosphere.Concrete, the flue gas of sintering blowing-type cooler high temperature section can be blown by several pipelines of drawing on sintering blowing-type cooler 1 enclosed hood by air blast 2, imports a female pipe again, the arrival end of warm waste heat boiler 3 in the introducing.Introduction pipe quantity can be determined according to on-the-spot physical condition on the sintering blowing-type cooler enclosed hood.Through in warm waste heat boiler 3 draw after the flue gas of supercooling is by circulating fan 4 suctions, can be by the flash back bellows of knot blowing-type cooler 1 bottom of one or more pipeline foldback.Sending the number of tubes of the bellows of sintering blowing-type cooler bottom back to can determine according to on-the-spot physical condition.Take such system that the taking-up of flue gas and return air are evenly distributed.The low-temperature flue gas of sintering blowing-type cooler 1 middle-temperature section is sent into low temperature exhaust heat boiler 5 arrival ends by the pipeline of drawing on the sintering blowing-type cooler enclosed hood, and flue gas after air-introduced machine 6 suctions, enters atmosphere through chimney after 5 coolings of low temperature exhaust heat boiler.
In order effectively to avoid the phenomenon of sintering blowing-type cooler chassis generation splash material, in another embodiment of the utility model, structure same as the previously described embodiments is no longer repeated at this.The characteristics of present embodiment are to be divided into smoke-box and following smoke-box at described sintering blowing-type cooler, on described, be respectively arranged with pressure automatic adjusting device in smoke-box and the following smoke-box, can be according to the pressure of last smoke-box and following smoke-box, automatically regulate its pressure and be in the reasonable range, to prevent the material splash.
In another embodiment of the utility model, be that upper and lower smoke chamber at sintering blowing-type cooler 1 is provided with pressure measurement point P, on the inlet duct of circulating fan 4 and enter on the pipeline of bellows of sintering blowing-type cooler bottom and all be provided with control valve and pressure automatic adjusting device, carry out pressure in response to the described pressure test device of going up in smoke-box and the following smoke-box respectively and regulate, thereby prevent the material splash.
According to field condition, the utility model can disperse to be provided with separate in warm waste heat boiler and low temperature exhaust heat boiler, as shown in Figure 5, certainly, in other embodiments, also separate middle temperature waste heat boiler and the combination of low temperature exhaust heat boiler can be provided with, so that the compact conformation of system.It is very flexible to make boiler arrange like this, is not subjected to the restriction of field condition.
And the middle temperature waste heat boiler in the utility model can be provided with economizer, evaporimeter and superheater (not shown) according to the needs of system's design; The low temperature exhaust heat boiler can be provided with economizer, heater and/or evaporimeter (not shown).
Claims (8)
1. a steel works sintering cooling machine low-temperature flue gas bootstrap system comprises sintering blowing-type cooler, waste heat boiler and air blast; Sintering blowing-type cooler is communicated with waste heat boiler by flue, by air blast flue gas is sent into waste heat boiler; It is characterized in that:
Warm waste heat boiler and low temperature exhaust heat boiler during described waste heat boiler comprises, the arrival end of warm waste heat boiler is communicated with by the high temperature section of flue with described sintering blowing-type cooler in described, and its port of export is communicated with the cold motivation of described sintering by the flue that is provided with circulating fan; The arrival end of described low temperature exhaust heat boiler is communicated with by the middle-temperature section of flue with described sintering blowing-type cooler, and its port of export is communicated with atmosphere.
2. steel works sintering cooling machine low-temperature flue gas bootstrap system as claimed in claim 1 is characterized in that, described sintering blowing-type cooler is divided into smoke-box and following smoke-box, is respectively arranged with pressure automatic adjusting device in smoke-box and the following smoke-box on described.
3. steel works sintering cooling machine low-temperature flue gas bootstrap system as claimed in claim 1 is characterized in that, be communicated with described in the flue of warm heat boiler outlet end and described sintering blowing-type cooler be one or more pipeline.
4. steel works sintering cooling machine low-temperature flue gas bootstrap system as claimed in claim 3 is characterized in that, be communicated with described in the flue of warm heat boiler outlet end and described sintering blowing-type cooler be provided with control valve and pressure automatic adjusting device.
5. steel works sintering cooling machine low-temperature flue gas bootstrap system as claimed in claim 4, it is characterized in that, described control valve and pressure automatic adjusting device be arranged on described between warm heat boiler outlet end and the described circulating fan and on the flue between described circulating fan and the described sintering blowing-type cooler, carry out pressure in response to the described pressure test device of going up in smoke-box and the following smoke-box respectively and regulate, thereby prevent the material splash.
6. steel works sintering cooling machine low-temperature flue gas bootstrap system as claimed in claim 1 is characterized in that, described in warm waste heat boiler and low temperature exhaust heat boiler branch be arranged or make up setting.
7. steel works sintering cooling machine low-temperature flue gas bootstrap system as claimed in claim 1 is characterized in that, described in warm waste heat boiler comprise economizer, evaporimeter and superheater.
8. steel works sintering cooling machine low-temperature flue gas bootstrap system as claimed in claim 1 is characterized in that, described low temperature exhaust heat boiler comprises economizer, heater and/or evaporimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201322360U CN201281548Y (en) | 2008-08-18 | 2008-08-18 | Low-temperature flue gas waste heat utilization system for sintered cooling machine of steel works |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201322360U CN201281548Y (en) | 2008-08-18 | 2008-08-18 | Low-temperature flue gas waste heat utilization system for sintered cooling machine of steel works |
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| CN201281548Y true CN201281548Y (en) | 2009-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008201322360U Expired - Lifetime CN201281548Y (en) | 2008-08-18 | 2008-08-18 | Low-temperature flue gas waste heat utilization system for sintered cooling machine of steel works |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825399A (en) * | 2010-04-21 | 2010-09-08 | 中冶长天国际工程有限责任公司 | Method and device for utilizing exhaust heat of waste gas in sinter cooler |
| CN108759476A (en) * | 2018-06-15 | 2018-11-06 | 中冶东方工程技术有限公司 | Sinter erects the system that cold drives the direct Driving Fan recovery waste heat of steam turbine |
-
2008
- 2008-08-18 CN CNU2008201322360U patent/CN201281548Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825399A (en) * | 2010-04-21 | 2010-09-08 | 中冶长天国际工程有限责任公司 | Method and device for utilizing exhaust heat of waste gas in sinter cooler |
| CN101825399B (en) * | 2010-04-21 | 2013-10-30 | 中冶长天国际工程有限责任公司 | Method and device for utilizing exhaust heat of waste gas in sinter cooler |
| CN108759476A (en) * | 2018-06-15 | 2018-11-06 | 中冶东方工程技术有限公司 | Sinter erects the system that cold drives the direct Driving Fan recovery waste heat of steam turbine |
| CN108759476B (en) * | 2018-06-15 | 2019-12-06 | 中冶东方工程技术有限公司 | system for vertical cold machine of sintering deposit drives steam turbine and directly drags fan to retrieve waste heat |
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Granted publication date: 20090729 |