CN102589305A - Sintering waste heat generating system - Google Patents
Sintering waste heat generating system Download PDFInfo
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- CN102589305A CN102589305A CN2012100442046A CN201210044204A CN102589305A CN 102589305 A CN102589305 A CN 102589305A CN 2012100442046 A CN2012100442046 A CN 2012100442046A CN 201210044204 A CN201210044204 A CN 201210044204A CN 102589305 A CN102589305 A CN 102589305A
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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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 discloses a sintering waste heat generating system. The sintering waste heat generating system comprises a waste heat recovery device, a steam turbine and a generator, wherein the waste heat recovery device comprises a circular cooling machine, a waste heat boiler and a hot blast furnace; the circular cooling machine is provided with a main inlet and an auxiliary air inlet; the main air inlet is used for transferring extracted first smoke to the waste heat boiler so that the first smoke is taken as a main heat source of the waste heat boiler; the auxiliary air inlet is used for transferring extracted second smoke to the hot blast furnace; the hot blast furnace is used for heating the second smoke; the heated second smoke is used for superheating main steam generated by the waste heat boiler in a superheater; the air intake quantity of the main air inlet is greater than that of the auxiliary air inlet; the steam turbine is connected to the waste heat boiler; and the generator is connected to the steam turbine, and is driven by the steam turbine to output electric energy. According to the invention, a downstream generator can provide stable electric energy output, so that the continuity and the stability of the sintering waste heat generating system are guaranteed.
Description
Technical field
The present invention relates to thermal source and utilize the field, relate in particular to a kind of sintering waste heat generating system.
Background technology
Sintering process belongs to technology before the iron in the Iron and Steel Production, sends into the iron-bearing material before the blast furnace in order to processing, and product is a sintering deposit.Sintering waste heat generating present in the industry is technological, and the high-temperature flue gas of mainly discharging with central cooler in the sintering process serves as to recycle object, utilizes the waste heat of flue gas to generate electricity.
Existing sintering waste heat utilizes engineering, and technological kind is more, and the overwhelming majority is pure afterheat generating system, and system is unique thermal source with the high-temperature flue gas of central cooler all.Fig. 1 is the sketch map of existing sintering waste heat generating system; As shown in Figure 1, sintering waste heat generating system 100 comprises central cooler 101, waste heat boiler 102, circulating fan 110, steam turbine 103, generator 104, condenser 105, condensate pump 106, gland heater 107, oxygen-eliminating device 109 and feed pump 108 etc.Central cooler 101 is provided with a plurality of air ports of getting, and flue gas is drawn via the air port of getting on the central cooler 101, and sends into waste heat boiler 102.Flue gas heated feed water in waste heat boiler 102 produces steam, after circulating fan 110 foldbacks return the bottom bellows of central cooler 101, circulation is used for the sintering deposit cooling.Waste heat boiler is produced the two-stage steam of different parameters, respectively as the main steam of steam turbine 103 with mend steam.Two-stage steam is sent in the steam turbine 103 through main steam ports and filling mouth respectively, so that steam turbine 103 drives generator 104 output electric energy.Exhaust steam becomes condensate after the acting of steam turbine 103 output after condenser 105 coolings, sends into oxygen-eliminating device 109 via behind condensate pump 106 and the gland heater 107, and sends into waste heat boiler 102 by feed pump 108, begins next circulation.
For existing various sintering waste heat generating systems, its main steam condition depends on the parameter of the high-temperature flue gas of central cooler discharge, and system's operation receives the restriction of flue gas fluctuation.In addition, from the reason of sintering process and installation feature, the fume afterheat of central cooler has certain fluctuation.Sintering machine plan and non-programmed halt number of times are more on the one hand, and temporary stoppage is more frequent; On the other hand cloth, sintering, unload links such as ore deposit, cloth wind and all have certain randomness, flue-gas temperature is difficult to stablize, within the specific limits fluctuation continuously.For pure afterheat generating system, be in the SINTERING PRODUCTION downstream on the operation, can only passive adaptation to the fluctuation of Gas Parameters, regulation measure is very limited.Because the boiler export steam parameter receives the direct influence of Gas Parameters, the running time and the stability of generating set all are restricted.Above-mentioned reason all causes the continuity of sintering waste heat generating system poor with stability, and then causes waste heat power station running rate low, and UTILIZATION OF VESIDUAL HEAT IN efficient is low.
Therefore, need a kind of sintering waste heat generating system to address the above problem.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art; The invention provides a kind of sintering waste heat generating system, said sintering waste heat generating system comprises: waste-heat recovery device, and said waste-heat recovery device comprises central cooler, waste heat boiler and hot-blast stove; Said central cooler is provided with main air port and the auxiliary air port of getting of getting; Said master gets the air port and is used for first flue gas that is extracted is delivered to said waste heat boiler, with the main thermal source as said waste heat boiler, saidly auxiliary get the air port and is used for second flue gas that is extracted is delivered to said hot-blast stove; Said hot-blast stove is used for said second flue gas is heated; It is overheated that the main steam that said second flue gas after the heating is used in superheater, said waste heat boiler being produced is carried out, and wherein, said master gets the air quantity in air port and gets the air quantity in air port greater than said assisting; Steam turbine, said steam turbine is connected to said waste heat boiler; And generator, said generator is connected to said steam turbine, with by said Steam Turbine Driven and export electric energy.
Preferably, said hot-blast stove heats said second flue gas through consuming coal gas.
Preferably, said superheater is a sectionalized superheater, and it is overheated that said second flue gas after the heating carries out said main steam in the finishing superheater of said sectionalized superheater at least.
Preferably, said finishing superheater be arranged in the said waste heat boiler, between said hot-blast stove to the said waste heat boiler or in the said hot-blast stove.
Preferably, said master gets the air port and is arranged on and can takes out the position of mean temperature more than or equal to 250 ℃ flue gas on the said central cooler.
Preferably, the said auxiliary air port of getting is arranged on and can takes out the position of mean temperature more than or equal to 150 ℃ flue gas on the said central cooler.
Preferably, said central cooler is provided with a plurality of said masters and gets the said auxiliary air port of getting of air port and, and the said auxiliary air port of getting is arranged on that a plurality of said masters get before the air port, a plurality of said master gets after the air port or a plurality of said master gets between the air port.
Preferably, said auxiliary get air port and said master get tuyere structure be said auxiliary get the air port get that air quantity is less than or equal to that said master gets the air port get 35% of air quantity.
Preferably, said waste heat boiler is two pressure waste heat boilers.
Preferably, the main-steam outlet of said pair of pressure waste heat boiler is connected with the main steam ports of said steam turbine, and the low-pressure steam outlet of said pair of pressure waste heat boiler is connected with the filling mouth of said steam turbine.
Preferably, said waste heat boiler is three pressure waste heat boilers.
Preferably; Said three press the main-steam outlet of waste heat boiler to be connected with the main steam ports of said steam turbine; Said three press the first order low-pressure steam outlet of waste heat boiler to be connected with the filling mouth of said steam turbine, and said three press the steam of the second level low-pressure steam outlet output of waste heat boiler to be used to send outside.
Preferably, the pressure of said main steam is lower than 4.0MPa, and the temperature of said main steam is lower than 500 ℃.
Preferably, said waste-heat recovery device also comprises circulating fan, and said circulating fan is connected between the exhanst gas outlet and said central cooler of said waste heat boiler, carries back said central cooler with the flue gas that said waste heat boiler is discharged.
Preferably, said sintering waste heat generating system comprises a plurality of waste-heat recovery devices.
Sintering waste heat generating system provided by the invention avoids this system's operation to receive the influence of flue gas fluctuation through auxiliary thermal source; And reduce the influence of frequent temporary stoppage; And then guarantee that the downstream generator provides stable electric energy output, guarantees the continuity and the stability of sintering waste heat generating system.Simultaneously, through main steam being carried out the overheated thermodynamic parameter that main steam can also be provided, so that the UTILIZATION OF VESIDUAL HEAT IN efficient of sintering waste heat generating system to be provided.In addition, because hot-blast stove only heats a spot of flue gas, therefore can reduce the energy resource consumption of auxiliary thermal source.
In the summary of the invention part, introduced the notion of a series of reduced forms, this will further explain in specific embodiment part.Content part of the present invention does not also mean that key feature and the essential features that will attempt to limit technical scheme required for protection, does not more mean that the protection domain of attempting to confirm technical scheme required for protection.
Below in conjunction with accompanying drawing, specify advantage of the present invention and characteristic.
Description of drawings
Attached drawings of the present invention is used to understand the present invention at this as a part of the present invention.Embodiments of the invention and description thereof have been shown in the accompanying drawing, have been used for explaining principle of the present invention.In the accompanying drawings,
Fig. 1 is the sketch map of existing sintering waste heat generating system;
Fig. 2 is the sketch map according to the sintering waste heat generating system of one embodiment of the present invention; And
Fig. 3 is the sketch map that uses the sintering waste heat generating system of three pressure waste heat boilers according to one embodiment of the present invention.
The specific embodiment
In the description hereinafter, a large amount of concrete details have been provided so that more thorough understanding of the invention is provided.Yet, it will be apparent to one skilled in the art that the present invention can need not one or more these details and be able to enforcement.In other example,, describe for technical characterictics more well known in the art for fear of obscuring with the present invention.
In order thoroughly to understand the present invention, detailed structure will be proposed in following description.Obviously, execution of the present invention is not limited to the specific details that those skilled in the art has the knack of.Preferred embodiment of the present invention is described in detail as follows, yet except these were described in detail, the present invention can also have other embodiments.
The invention provides a kind of sintering waste heat generating system, this system stablizes the inlet flue gas parameter of waste heat boiler through afterburning coal gas.Fig. 2 is the sketch map according to the sintering waste heat generating system 200 of one embodiment of the present invention.To combine Fig. 2 that sintering waste heat generating system 200 according to the present invention is described in detail below.Need to prove that when mentioning " in order connect " perhaps during " connections " multiple arrangement, this " connection in order " perhaps " connection " can be directly adjacent device to be linked together, and can also be between adjacent device, to be connected with middle device; When mentioning " directly connecting " multiple arrangement, be to be understood that to multiple arrangement directly connects, promptly between multiple arrangement, be not connected with middle device.
Sintering waste heat generating system 200 comprises waste-heat recovery device 220, steam turbine 203 and generator 204.
Waste-heat recovery device 220 comprises central cooler 201, waste heat boiler 202 and hot-blast stove 212.
The master gets air port a, b is used for first flue gas that is extracted is delivered to waste heat boiler 202.First flue gas will be as the main thermal source of waste heat boiler 202, and it is interior via heating surface and working medium generation heat exchange that it gets into waste heat boiler 202, supplies the steam turbine 203 expansion actings in downstream to use so that working medium changes water saturation steam into.Since waste heat boiler 202 from main get first flue gas that air port a, b obtain will be as the main thermal source of heat exchange; Therefore; Preferably; The master gets air port a, b is arranged on the position that can take out the higher flue gas of mean temperature on the central cooler 201, for example is arranged on to take out the position of mean temperature more than or equal to 250 ℃ flue gas.
Auxiliary get air port c and be used for second flue gas that is extracted is delivered to hot-blast stove 212.212 pairs of these second flue gases of hot-blast stove heat, with the temperature of second flue gas that raises.It is overheated that the main steam that second flue gas after the heating is used in superheater 211, waste heat boiler 202 being produced is carried out.As an example, hot-blast stove 212 can be through consuming coal gas to heating from auxiliary second flue gas of getting air port c.In addition, hot-blast stove 212 can also heat second flue gas through burn other fuel or energising.Hot-blast stove 212 can be the integrated equipment of one with waste heat boiler 202, can also be independent split type equipment.For main steam is heated to target temperature; Superheater 211 can be sectionalized superheater; Be that superheater 211 is formed by the sectionalized superheater arranged in series, and it is overheated that second flue gas after the heating carries out main steam in the finishing superheater of sectionalized superheater at least.Finishing superheater is appreciated that the primary superheater into the last process of main steam in the sectionalized superheater.Further; Finishing superheater can be arranged in the waste heat boiler 202, between hot-blast stove 212 to the waste heat boiler 202 or in the hot-blast stove 212; The arrangement of finishing superheater is comparatively flexible, and it can be arranged on any position in above-mentioned a plurality of position, as long as can realize its function.
Because it is overheated after second flue gas is mainly used in and in hot-blast stove 212, heats up the main steam of waste heat boiler 202 to be carried out; Therefore; Can with main get air port a, b and auxiliary get air port c be configured to main get air port a, b get air quantity greater than the auxiliary air quantity of getting of getting air port c, only satisfy that promptly the overheated employed exhaust gas volumn of main steam is got final product.As an example, the main air port a, b and auxiliary of getting gets getting air quantity and can constructing through main air port a, b and the auxiliary aperture area of getting air port c got is set of air port c.Through hot-blast stove 212 is heated a spot of second flue gas that from central cooler 201, extracts as auxiliary thermal source; And second flue gas after will heating main steam is carried out overheated; Can remedy the parameter fluctuation of sintering waste heat (promptly from the first heat-obtaining mouth a of central cooler 201, first flue gas that b obtains); And then guarantee that downstream generator 204 provides stable electric energy output, guarantees the continuity and the stability of sintering waste heat generating system 200.Simultaneously, through main steam being carried out the overheated thermodynamic parameter that main steam can also be provided, so that the UTILIZATION OF VESIDUAL HEAT IN efficient of sintering waste heat generating system 200 to be provided.In addition, because hot-blast stove 212 only heats a spot of flue gas, therefore can reduce the energy resource consumption of auxiliary thermal source.
Preferably; Main get air port a, b and auxiliary get air port c be configured to auxiliary get air port c get air quantity be less than or equal to main get air port a, b get 35% of air quantity; Under the prerequisite that can satisfy the overheated employed exhaust gas volumn of main steam, reducing the consumption of auxiliary thermal source as far as possible, and then efficiency of energy utilization is provided.
Owing to will in hot-blast stove 212, heat from auxiliary second flue gas of getting air port c taking-up; Therefore; Can be higher from auxiliary temperature of getting second flue gas of air port c taking-up, also can be more lower slightly, but the temperature of considering second flue gas is crossed the low consumption that may increase hot-blast stove 212 place's auxiliary thermal sources; Therefore; Preferably, the auxiliary air port c that gets is arranged on and can takes out the position of mean temperature more than or equal to 150 ℃ flue gas on the central cooler 201, so that the mean temperature of second flue gas is more than or equal to 150 ℃.According to one embodiment of the present invention, central cooler 201 is provided with a plurality of masters and gets air port a, b and the auxiliary air port c that gets.A plurality of masters are set get the organic efficiency that residual heat resources can be improved in the air port.As an example, the auxiliary air port c that gets can be arranged on a plurality of masters and gets before air port a, the b, so that hot-blast stove 212 obtains the second higher relatively flue gas of temperature, and then reduces the consumption of auxiliary thermal source.As an example, the auxiliary air port c that gets also can be arranged on a plurality of masters and gets after air port a, the b, to increase the yield of high-temperature flue gas, improves the organic efficiency of residual heat resources.As an example, the auxiliary air port c that gets can also be arranged on a plurality of masters and gets between air port a, the b.Owing to main get air port a, b and auxiliaryly get air port c self and all can be set to adjustable air port of getting; For example; Its temperature etc. of the flue gas of getting air quantity and/or obtaining of scalable; And a certainly can exert an influence to all the other flue gases that get the place, air port when getting the air port regulating, therefore, the auxiliary air port c that gets is arranged on a plurality of masters and get and can strengthen the auxiliary regulating power of getting air port c between air port a, the b.In a word, auxiliary position of getting air port c can be selected as required flexibly.
It is overheated that the main steam that second flue gas after the heating produces waste heat boiler 202 in superheater 211 is carried out.Main steam is being carried out in the overheated process, and the temperature of second flue gas descends gradually, but it still has higher temperature, therefore in order to improve the rate of recovery of heat, can with this part second flue gas with mixes confession heating surface heat exchange use from first flue gas.
In waste heat boiler 202, high-temperature flue gas (can comprise first flue gas and through second flue gas behind the superheater 211) and working medium generation heat exchange can be discharged via the steam (vapor) outlet of waste heat boiler 202 after making working medium change steam into.High-temperature flue gas in waste heat boiler 202 after the heat exchange cooling, the bottom that can carry back central cooler 201, circulation offers central cooler 201 uses, can also discharge outside the system.
Further; Sintering waste heat retracting device 220 also comprises circulating fan 210; Circulating fan 210 is connected between the exhanst gas outlet of central cooler 201 and waste heat boiler 202, so that the flue gas after the heat exchange is carried back central cooler 201 from waste heat boiler 202, to improve energy utilization rate.In addition; Upstream and downstream at circulating fan 210 can also be provided with air compensation device and air exhausting device respectively, to satisfy the adjusting control under normal operation of system and the special operation condition, wherein; Not shown air compensation device and air exhausting device in Fig. 2, and only represent to mend wind and air draft with arrow M and N.Certainly, the low-temperature flue gas that the exhanst gas outlet of waste heat boiler 202 is discharged can also enter in the atmosphere, can also handle these low-temperature flue gas before in entering atmosphere, environment is exerted an influence avoiding.
According to one embodiment of the present invention, waste heat boiler 202 is two pressure waste heat boilers.Two pressure waste heat boilers 202 have two kinds of steam (vapor) outlets, are used for exporting respectively the steam of two kinds of different pressures, i.e. main steam and low-pressure steam.As an example, the main-steam outlet e of two pressure waste heat boilers 202 is connected with the main steam ports of steam turbine 203, and the low-pressure steam of two pressure waste heat boilers 202 outlet f is connected with the filling mouth of steam turbine 203.Certainly, the low-pressure steam of two pressure waste heat boilers 202 outlet f can also be connected with other external equipment, and sending outside altogether with the steam that low-pressure steam is exported f output, other external equipment uses.
Another embodiment according to the present invention, waste heat boiler are three pressure waste heat boilers.Fig. 3 is for using the sintering waste heat generating system 300 of three pressure waste heat boilers 302.Because the miscellaneous equipment in this system is identical with sintering waste heat generating system 200, therefore no longer detail.Three press waste heat boiler 302 to have three kinds of steam (vapor) outlets, are used for exporting respectively the steam of three kinds of different pressures, i.e. main steam, first order low-pressure steam and second level low-pressure steam.As an example; Three press the main-steam outlet e of waste heat boiler 302 to be connected with the main steam ports of steam turbine 303; Three press the first order low-pressure steam outlet f of waste heat boiler 302 to be connected with the filling mouth of steam turbine 303, and three press the steam of the second level low-pressure steam outlet g output of waste heat boiler 302 to be used to send outside.For first order low-pressure steam and second level low-pressure steam; The present invention not desire limits its relative pressure, that is, the pressure of first order low-pressure steam can be greater than the pressure of second level low-pressure steam; Also can be less than the pressure of second level low-pressure steam, but both should be all less than the pressure of main steam.
Continuation is with reference to Fig. 2, and sintering waste heat generating system 200 can also comprise water recovery apparatus, is condensed into water and offers waste heat boiler 202 with the steam with steam turbine 203 outputs.As an example; Water recovery apparatus can comprise condenser, condensate pump, gland heater, oxygen-eliminating device and the feed pump that connects in order; Wherein, The inlet of condenser is connected with steam turbine, and the feedwater delivery side of pump is connected with the water inlet of waste heat boiler 202, and the steam (vapor) outlet of gland heater returns and is connected to condenser.Exhaust steam in steam turbine 203 after the acting gets into condenser, and in condenser, condenses into water, and these condensate are delivered to gland heater through condensate pump.Gas leakage and conveying that gland heater can reclaim in the gland heater are back to condenser; With heat-setting water; So not only can reclaim working medium, but also can reclaim heat; And then the heat of recycling the leakage vapour of gland heater improves the temperature of condensate, thereby improves the heat-economy of sintering waste heat generating system 200.Condensate offers waste heat boiler 202 from gland heater via feed pump and recycles; And these condensate also need be passed through oxygen-eliminating device before being admitted to waste heat boiler 202; To remove oxygen and other gas that is dissolved in the condensate, prevent and reduce the corrosion of feed pipe, economizer and other auxiliary device of waste heat boiler 202.Condensate through behind the oxygen-eliminating device is pumped to waste heat boiler 202 by feed pump, and these condensate offer waste heat boiler 202 as boiler feedwater, with high-temperature flue gas generation heat exchange and change Boiler Steam into, begins next circulation.
In addition; Sintering waste heat generating system 200 can comprise a plurality of waste-heat recovery devices 220; Reclaim the many places sintering waste heat to overlap electricity generation system (comprising steam turbine 203 and generator 204), and then avoid overlapping construction, and can more effectively improve the stability of electricity generation system through one.What it will be appreciated by those skilled in the art that is, when comprising a plurality of waste-heat recovery device 220, the steam of the close pressure of a plurality of waste-heat recovery devices 220 outputs can be delivered to steam turbine 203 after mixing arrangement mixes.For instance; When the waste heat boiler that comprises when a plurality of waste-heat recovery devices 220 is two pressure waste heat boiler; Be delivered to the main steam ports of steam turbine 203 after the main steam that transfers out from the main-steam outlet of each two pressure waste heat boiler can be mixed via first mixing arrangement, be delivered to the filling mouth of steam turbine 203 after the low-pressure steam that transfers out from the low-pressure steam outlet of each two pressure waste heat boiler can mix via second mixing arrangement.
Sintering waste heat generating system provided by the invention avoids this system's operation to receive the influence of flue gas fluctuation through auxiliary thermal source; And reduce the influence of frequent temporary stoppage; And then guarantee that the downstream generator provides stable electric energy output, guarantees the continuity and the stability of sintering waste heat generating system.Simultaneously, through main steam being carried out the overheated thermodynamic parameter that main steam can also be provided, so that the UTILIZATION OF VESIDUAL HEAT IN efficient of sintering waste heat generating system to be provided.In addition, because hot-blast stove only heats a spot of flue gas, therefore can reduce the energy resource consumption of auxiliary thermal source.
The present invention is illustrated through the foregoing description, but should be understood that, the foregoing description just is used for for example and illustrative purposes, but not is intended to the present invention is limited in the described scope of embodiments.It will be appreciated by persons skilled in the art that in addition the present invention is not limited to the foregoing description, can also make more kinds of variants and modifications according to instruction of the present invention, these variants and modifications all drop in the present invention's scope required for protection.Protection scope of the present invention is defined by appended claims book and equivalent scope thereof.
Claims (15)
1. a sintering waste heat generating system is characterized in that, said sintering waste heat generating system comprises:
Waste-heat recovery device; Said waste-heat recovery device comprises central cooler, waste heat boiler and hot-blast stove, and said central cooler is provided with the main air port of getting and gets the air port with auxiliary, and said master gets the air port and is used for first flue gas that is extracted is delivered to said waste heat boiler; With main thermal source as said waste heat boiler; Saidly auxiliary get the air port and be used for second flue gas that is extracted is delivered to said hot-blast stove, said hot-blast stove is used for said second flue gas is heated, and it is overheated that the main steam that said second flue gas after the heating is used in superheater, said waste heat boiler being produced is carried out; What wherein, said master got the air port gets air quantity greater than the said auxiliary air quantity in air port of getting;
Steam turbine, said steam turbine is connected to said waste heat boiler; With
Generator, said generator is connected to said steam turbine, with by said Steam Turbine Driven and export electric energy.
2. according to the described sintering waste heat generating system of claim 1, it is characterized in that said hot-blast stove heats said second flue gas through consuming coal gas.
3. according to the described sintering waste heat generating system of claim 1, it is characterized in that said superheater is a sectionalized superheater, it is overheated that said second flue gas after the heating carries out said main steam in the finishing superheater of said sectionalized superheater at least.
4. according to the described sintering waste heat generating system of claim 3, it is characterized in that said finishing superheater is arranged in the said waste heat boiler, between said hot-blast stove to the said waste heat boiler or in the said hot-blast stove.
5. according to the described sintering waste heat generating system of claim 1, it is characterized in that said master gets the air port and is arranged on and can takes out the position of mean temperature more than or equal to 250 ℃ flue gas on the said central cooler.
6. according to the described sintering waste heat generating system of claim 1, it is characterized in that the said auxiliary air port of getting is arranged on and can takes out the position of mean temperature more than or equal to 150 ℃ flue gas on the said central cooler.
7. according to claim 5 or 6 described sintering waste heat generating systems; It is characterized in that; Said central cooler is provided with a plurality of said masters and gets the said auxiliary air port of getting of air port and, and the said auxiliary air port of getting is arranged on that a plurality of said masters get before the air port, a plurality of said master gets after the air port or a plurality of said master gets between the air port.
8. according to the described sintering waste heat generating system of claim 1, it is characterized in that, said auxiliary get air port and said master get tuyere structure be said auxiliary get the air port get that air quantity is less than or equal to that said master gets the air port get 35% of air quantity.
9. according to the described sintering waste heat generating system of claim 1, it is characterized in that said waste heat boiler is two pressure waste heat boilers.
10. according to the described sintering waste heat generating system of claim 9, it is characterized in that the main-steam outlet of said pair of pressure waste heat boiler is connected with the main steam ports of said steam turbine, the low-pressure steam outlet of said pair of pressure waste heat boiler is connected with the filling mouth of said steam turbine.
11., it is characterized in that said waste heat boiler is three pressure waste heat boilers according to the described sintering waste heat generating system of claim 1.
12. according to the described sintering waste heat generating system of claim 11; It is characterized in that; Said three press the main-steam outlet of waste heat boiler to be connected with the main steam ports of said steam turbine; Said three press the first order low-pressure steam outlet of waste heat boiler to be connected with the filling mouth of said steam turbine, and said three press the steam of the second level low-pressure steam outlet output of waste heat boiler to be used to send outside.
13. the waste heat boiler according to the described employing multiple pressure of claim 1 system is characterized in that the pressure of said main steam is lower than 4.0MPa, the temperature of said main steam is lower than 500 ℃.
14. according to the described sintering waste heat generating system of claim 1; It is characterized in that; Said waste-heat recovery device also comprises circulating fan; Said circulating fan is connected between the exhanst gas outlet and said central cooler of said waste heat boiler, carries back said central cooler with the flue gas that said waste heat boiler is discharged.
15., it is characterized in that said sintering waste heat generating system comprises a plurality of waste-heat recovery devices according to the described sintering waste heat generating system of claim 1.
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| CN103615908A (en) * | 2013-12-11 | 2014-03-05 | 北京志能祥赢节能环保科技有限公司 | Combined waste heat recycling system for stepping-type flat-burning sintering machine |
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