CN102705810B - Device for boiler flue gas waste heat utilization in thermal power unit - Google Patents

Device for boiler flue gas waste heat utilization in thermal power unit Download PDF

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CN102705810B
CN102705810B CN201210203999.0A CN201210203999A CN102705810B CN 102705810 B CN102705810 B CN 102705810B CN 201210203999 A CN201210203999 A CN 201210203999A CN 102705810 B CN102705810 B CN 102705810B
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flue gas
air
heat
heat exchanger
boiler
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CN102705810A (en
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向文国
黄进
黄绍新
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黄绍新
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The invention discloses a device for boiler flue gas waste heat utilization in a thermal power unit, which can improve the utilization rate of flue gas waste heat. The device comprises a coal economizer, an air preheater, a flue gas water heater, a flue gas heat exchanger and an air heat exchanger, wherein the coal economizer is installed at an outlet of a boiler; flue gas exhausted from the coal economizer is divided into a first part of flue gas and a second part of flue gas; the first part of flue gas and the second part of flue gas enter the flue gas heat exchanger after flowing through the air preheater and the flue gas water heater; the flue gas heat exchanger adsorbs heat through heat conduction oil and transmits the heat to the air heat exchanger; and the air outlet end of the air heat exchanger is connected with the air inlet end of the air preheater. The device has the beneficial effects that the flue gas exhausted from the coal economizer is divided into the two parts, the two parts of flue gas respectively heat air and water, and then the surplus heat of the two parts of flue gas is adsorbed through the heat conduction oil and is transferred to air so as to improve the utilization rate of the flue gas.

Description

The device that thermal power unit boiler fume afterheat utilizes
Technical field
The present invention relates to thermal cycle machinery technical field, particularly relate to the device that a kind of thermal power unit boiler fume afterheat utilizes.
Background technology
Along with the development of energy saving environmental protection product, the thermal efficiency of the maximum discharge industries such as boiler improves also intensification gradually.In boiler heat loss, the proportion that power plant's heat loss due to exhaust gas accounts for is very large.Research shows, the every reduction by 10 of exhaust gas temperature is spent to 15 degree, and the thermal efficiency of boiler just can improve 1%.
At present, although existing fume afterheat has obtained some utilizations, but still there is the very large space that utilizes: along with the continuous progress of flue gas desulfurization and denitrification technology, flue gas acid dew point has dropped to 90 DEG C of left and right, and the exhaust gas temperature operated by rotary motion of large-scale unit is at 120 ~ 140 DEG C, that is to say, also there is very large decline space in exhaust gas temperature.Simultaneously, the exhaust gas temperature of overcritical and Boiler of Ultra-supercritical Unit is generally higher than its design temperature, and like this, the flue-gas temperature that enters air preheater from economizer exit is far away higher than the acid dew point of flue gas, this part heat having more is not fully utilized, and has increased the heat loss of smoke evacuation.
Cause the higher reason of exhaust gas temperature a lot, may be to have deviation due to Actual combustion ature of coal and predetermined burning coal, add the pickup capabilities deficiency to tube wall, the soot blower of back-end surfaces is arranged unreasonable or is acted on not obvious, cause the heating surface of economizer and/or air preheater less than normal, also just can not well bring into play the effect that fume afterheat utilizes.
According to current Main Viewpoints, can solve the problems referred to above by following two approach:
The first, the heat transfer area of increase air preheater.The flow area of flue gas in air preheater increases, and flue gas and air reverse flow just can be carried out fully heat exchange in the time of air preheater, effectively improve the problem of fume afterheat heat release deficiency.But, the heat transfer area of air preheater be not to be the bigger the better: along with the reduction of exhaust gas temperature, the temperature difference of air and flue gas constantly reduces, air preheater utilizes effect more and more not obvious to fume afterheat, a lot of even if the heat transfer area of air preheater increases, flue-gas temperature reduces amplitude can great changes have taken place yet; When exhaust gas temperature is lower, the economizer bank wall temperature of air preheater is during lower than flue gas acid dew point, can produce cold end corrosion, reduce the service life of air preheater, will change every one or two years or even half a year; Before this thinking of heat transfer area of continuation optimization air preheater obviously will cause fume afterheat utilization ratio secular stagnation not.
The second, suitably increase the heating surface of economizer.Adopt the low-pressure coal saver of larger heating surface can improve to a certain extent feed temperature, strengthen fume afterheat utilization; But because the flue gas quality that participates in conducting heat is not high, the heat-transfer effect of the method is limited.
Therefore,, according to existing main flow thinking, the efficiency of fume afterheat utilization has been difficult to compared with quantum jump; Wanting to improve fume afterheat utilization ratio must look for another way.How effectively to improve fume afterheat utilization ratio, be the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide the device that a kind of thermal power unit boiler fume afterheat utilizes, this device can significantly improve the efficiency that fume afterheat utilizes.
For solving the problems of the technologies described above, the invention provides the device that a kind of thermal power unit boiler fume afterheat utilizes, comprise economizer, air preheater, flue gas feed-water heater, flue gas heat-exchange unit and air heat exchanger, described economizer is arranged on the exit of boiler, the flue gas of discharging from described economizer is divided into Part I flue gas and Part II flue gas, described Part I flue gas and Part II flue gas are flowed through respectively after described air preheater and flue gas feed-water heater and are entered described flue gas heat-exchange unit, described flue gas heat-exchange unit is absorbed heat and is passed to described air heat exchanger by conduction oil, the air outlet slit end of described air heat exchanger is connected with the air intlet end of described air preheater.
Preferably, described flue gas feed-water heater comprises interconnective flue gas high-pressure feed-water heater and flue gas low-pressure feed heater, the gas approach end of described flue gas high-pressure feed-water heater is connected with described economizer, and the smoke outlet of described flue gas low-pressure feed heater is connected with the gas approach end of described flue gas heat-exchange unit.
Preferably, between described flue gas heat-exchange unit and air heat exchanger, be also provided with the circulating pump that circulation power is provided for described conduction oil.
Preferably, described economizer is further connected with for controlling described Part I flue gas and the how many controller of Part II flue gas.
Preferably, described controller has comparator, described comparator is for relatively sending into actual temperature and the predetermined temperature of the air of boiler, if higher than predetermined temperature, described controller control reduces the amount of described Part I flue gas, if lower than predetermined temperature, described controller control increases the amount of described Part I flue gas.
Preferably, described Part II flue gas accounts for 5% ~ 20% of whole flue gases.
The flue gas producing in boiler is discharged by economizer, then be divided into Part I flue gas and Part II flue gas, Part I flue gas carries out last preheating by air preheater to the air of sending into boiler, and Part II flue gas heats the feedwater of steam turbine through flue gas feed-water heater.Through above-mentioned processing, most of heat that Part I flue gas and Part II flue gas include is all recovered and has utilized, remaining small part heat is absorbed by conduction oil mobile in flue gas heat-exchange unit, then conduction oil flow to air heat exchanger and by absorb thermal release, air heat exchanger utilizes this part heat to carry out preliminary preheating to the air of sending into boiler, the air of preliminary preheating carries out last preheating by air preheater, then enters burning in boiler.After above multi task process, the heat of flue gas has obtained sufficient recovery, and flue gas waste heat recovery efficiency significantly improves, the problem of the flue gas thermal discharge deficiency that while also having solved simple employing air preheater, the flue gas shunting of its entrance point causes simultaneously; Secondly, Part II flue gas heats fully to feedwater, feedwater after heating is returned to steam turbine again and is carried out follow-up processing, thereby share the burden that adopts bleeder steam heated feed water, meet the principle that energy ladder utilizes, also required the bleeding of steam turbine, energy-conserving and environment-protective have more just been saved to a great extent; In addition, flue gas heat-exchange unit and air heat exchanger relatively simple for structure, both heating surfaces are all adjusted than being easier to, and can adjust as required, and then avoid the etching problem of heat exchanger.
One preferred embodiment in, described economizer is further connected with for controlling Part I flue gas and the how many controller of Part II flue gas, described controller has comparator, comparator is for relatively sending into actual temperature and the predetermined temperature of the air of boiler, if send into the actual temperature of air of boiler higher than predetermined temperature, controller control reduces the amount of Part I flue gas, otherwise increase the amount of Part I flue gas, according to the number of adjustment two parts flue gas of height real-time of air themperature of sending into boiler, and then the actual temperature that reaches the air of sending into boiler meets combustion requirements (equate with predetermined temperature or remain in the fluctuating range of permission).
Brief description of the drawings
Fig. 1 is the structural representation of the device that utilizes of thermal power unit boiler fume afterheat provided by the present invention in a kind of detailed description of the invention.
Detailed description of the invention
Core of the present invention is to provide the device that a kind of thermal power unit boiler fume afterheat utilizes, and this device is the recovery utilization rate of fume afterheat significantly.
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, Fig. 1 is the structural representation of the device that utilizes of thermal power unit boiler fume afterheat provided by the present invention in a kind of detailed description of the invention.
In Fig. 1, solid line represents water, and dotted line represents steam, and single-point line represents flue gas, and double dot dash line represents air.
The device that the present invention also provides a kind of thermal power unit boiler fume afterheat to utilize, comprise air preheater 2, economizer 1, air heat exchanger 3, flue gas heat-exchange unit 5 and flue gas feed-water heater, economizer 1 connects the exit that is arranged on boiler, the air intlet end of air preheater 2 is connected with economizer 1 with the air outlet slit end of air heat exchanger 3 respectively with air outlet slit end, the gas approach end of air preheater 2 and flue gas feed-water heater is all connected with the smoke outlet of economizer 1, and both smoke outlets are all connected with the gas approach end of flue gas heat-exchange unit 5.Therefore, the flue gas of discharging from the smoke outlet of economizer 1 is split into Part I flue gas and Part II flue gas, Part I flue gas and Part II flue gas flow through respectively air preheater 2 and flue gas feed-water heater, then two parts flue gas enters flue gas heat-exchange unit 5, flue gas heat-exchange unit 5 utilizes conduction oil that the after-heat of two parts flue gas is absorbed and stored, in the time that conduction oil flow to air heat exchanger 3, conduction oil and air carry out exchange heat, air is carried out to preliminary preheating, and the air outlet slit end of air heat exchanger 3 and the air intlet end of air preheater 2 are connected, air after preliminary preheating carries out last preheating by air preheater 2 again, in the time that air meets requiring of boiler, directly entering boiler uses, Part I flue gas after treatment and Part II flue gas are unified discharges to outside by flue gas heat-exchange unit 5.
Above-mentioned flue gas feed-water heater can comprise interconnective flue gas high-pressure feed-water heater 4 and flue gas low-pressure feed heater 8, high-pressure feed water and the low pressure feed water of the heat that flue gas high-pressure feed-water heater 4 and flue gas low-pressure feed heater 8 utilize respectively flue gas to steam turbine heats, the gas approach end of flue gas high-pressure feed-water heater 4 is connected with the smoke outlet of economizer 1, and the smoke outlet of flue gas low-pressure feed heater 8 is connected with the gas approach end of flue gas heat-exchange unit 5.
In the time that the pressure-drop in pipeline between steam turbine and flue gas feed-water heater is higher, for realizing smoothly feedwater circulating between steam turbine and flue gas feed-water heater, can between steam turbine and flue gas feed-water heater, water pump be set.A water pump (being sign in figure) is set on the pipeline between steam turbine and flue gas high-pressure feed-water heater 4, a water pump (not indicating in figure) is set on the pipeline of steam turbine and flue gas low-pressure feed heater 8.Certainly,, if the pressure-drop in pipeline between steam turbine and flue gas feed-water heater is smaller, feedwater can enter flue gas feed-water heater under nature heats, and then flows back to smoothly steam turbine, can omit above-mentioned two water pumps.
Wherein, the Part I flue gas flowing out from air preheater 2 and the flue gas flowing out from flue gas low-pressure feed heater 8 can be thoroughly mixed to form mixed flue gas in pipeline, and then unify to enter flue gas heat-exchange unit 5, contribute to like this to improve the efficiency of heat exchange.Certainly, Part I flue gas after treatment and Part II flue gas also can flow into respectively flue gas heat-exchange unit 5 and carry out heat exchange.
In flue gas heat-exchange unit 5, flow and have conduction oil, conduction oil absorbs from the waste heat of mixed flue gas and heat is stored, and then conduction oil flow to air heat exchanger 3, by the thermal release storing, thereby air is carried out to preliminary preheating.
For realizing smoothly conduction oil flowing between flue gas heat-exchange unit 5 and air heat exchanger 3, circulating pump 6 can be set.Conduction oil generally can be warmed up to 80-100 DEG C after the interior absorption heat of flue gas heat-exchange unit 5, conduction oil after intensification is boosted and is entered air heat exchanger 3 by circulating pump 6, after conduction oil completes heat conversion, temperature can reduce, conduction oil after cooling again circulates and enters flue gas heat-exchange unit 5 and absorb heat, so repeatedly realizes absorption and the transmission of heat.
The air intlet end of air heat exchanger 3 is connected with pressure fan, pressure fan is sent the air under normal temperature into air heat exchanger 3, air will absorb the heat of conduction oil, generally, air can tentatively be preheating to 40-70 DEG C, and the air that completes preliminary preheating enters air preheater 2 again and carries out last preheating.Because the heat of the conduction oil in air heat exchanger 3 is absorbed, the temperature of conduction oil generally can drop to 60-80 DEG C, and cooled conduction oil turns back in flue gas heat-exchange unit 5 and continues to absorb heat, enters next round thermal cycle.Temperature through flue gas heat-exchange unit 5 mixed flue gas after treatment generally can drop to 90-120 DEG C, and flue gas now can directly enter chimney by flue and discharge.
If the air themperature of the air outlet slit end of air preheater 2 requirement to air themperature lower than boiler (being the predetermined temperature of air), strengthen the fluid flow of circulating pump 6, accelerate the heat transfer rate of conduction oil, allow air continual with conduction oil high temperature carry out heat exchange, thereby improve the temperature after the preliminary preheating of air, then the air of preliminary preheating is sent into air preheater 2 and finally heat, to meet the requirement of boiler to air themperature; Otherwise, reducing the fluid flow of circulating pump 6, the speed of slow down conduction oil and air heat exchange, reduces flow and the flow velocity of conduction oil, reduces the temperature after the preliminary preheating of air.
For realizing smoothly conduction oil flowing between flue gas heat-exchange unit 5 and air heat exchanger 3, circulating pump 6 can be set.Conduction oil generally can be warmed up to 80-100 DEG C after the interior absorption heat of flue gas heat-exchange unit 5, conduction oil after intensification is boosted and is entered air heat exchanger 3 by circulating pump 6, after conduction oil completes heat conversion, temperature can reduce, conduction oil after cooling again circulates and enters flue gas heat-exchange unit 5 and absorb heat, so repeatedly realizes absorption and the transmission of heat.
The air intlet end of air heat exchanger 3 is connected with pressure fan, and pressure fan is sent the air under normal temperature into air heat exchanger 3, and air will absorb the heat of conduction oil.Generally, air can tentatively be preheating to 40-70 DEG C, and the air that completes preliminary preheating enters air preheater 2 again and carries out last preheating.Because the heat of the conduction oil in air heat exchanger 3 is absorbed, the temperature of conduction oil generally can drop to 60-80 DEG C, and cooled conduction oil turns back in flue gas heat-exchange unit 5 and continues to absorb heat, enters next round thermal cycle.Temperature through flue gas heat-exchange unit 5 mixed flue gas after treatment generally can drop to 90-120 DEG C, and flue gas now can directly enter chimney by flue and discharge.
If the air themperature of the air outlet slit end of air preheater 2 requirement to air themperature lower than boiler (being the predetermined temperature of air), strengthen the fluid flow of circulating pump 7, accelerate the heat transfer rate of conduction oil, allow air continual with conduction oil high temperature carry out heat exchange, thereby improve the temperature after the preliminary preheating of air, then the air of preliminary preheating is sent into air preheater 2 and finally heat, to meet the requirement of boiler to air themperature; Otherwise, reducing the fluid flow of circulating pump 7, the speed of slow down conduction oil and air heat exchange, reduces flow and the flow velocity of conduction oil, reduces the temperature after the preliminary preheating of air.
Flue gas in boiler is discharged through economizer 1, and flue gas is split into Part I flue gas and Part II flue gas:
First Part II flue gas heats the high-pressure feed water in steam turbine through flue gas high-pressure feed-water heater 4, then entering flue gas low-pressure feed heater 8 heats the low pressure feed water of steam turbine, high-pressure feed water after heating and low pressure feed water will enter respectively next stage high-pressure heater 9 and the low-pressure heater 7 of steam turbine and proceed heating, but because having been undertaken one by Part II flue gas, high-pressure feed water and low pressure feed water take turns heating, the burden of high-pressure heater 9 and low-pressure heater 7 has just reduced accordingly, the waste heat of Part II flue gas has also obtained utilization.Because high-pressure heater 9 and low-pressure heater 7 utilize steam, feedwater is heated, reducing of the load of high-pressure heater 9 and low-pressure heater 7, the amount of drawing gas of Steam Turbine Regenerative System is significantly reduced, the part of saving is drawn gas and can in steam turbine, be continued acting, has also played to a certain extent the effect that improves unit efficiency.
Part I flue gas flow direction air preheater 2, air preheater 2 is interior air and the reverse circulation of flue gas simultaneously, according to countercurrent heat-transfer, air preheater 2 utilizes Part I flue gas to carry out last preheating to the air of sending into boiler, generally air preheat is arrived to 250-330 DEG C, make air meet burning needs and then send in boiler 1; Now, the abundant release heat of Part I flue gas in air preheater 2, Part I flue gas generally can drop to 120-140 DEG C after air preheater 2 is processed, the higher and problem that cannot make full use of of the cigarette temperature that solved air preheater 2 gas approach ends.
Part I flue gas mixedly flows into flue gas heat-exchange unit 5 with the Part II flue gas flowing out from flue gas low-pressure feed heater 8 from air preheater 2 flows out, flue gas heat-exchange unit 5 utilizes conduction oil that the after-heat of two parts flue gas is absorbed and stored, then pass to air heat exchanger 3, the air intlet end of air heat exchanger 3 is connected with pressure fan, the air that conduction oil and pressure fan are sent into passes through flue gas heat-exchange unit 5 inversely, according to countercurrent heat-transfer, the air that conduction oil is sent into pressure fan carries out preliminary preheating (air sent into of pressure fan namely will be sent into the air of boiler), generally, through preliminary preheating, air can be preheating to 50-80 DEG C from atmospheric temperature, air after preliminary preheating is sent into air preheater 2, this air namely air preheater 2 utilizes Part I flue gas to carry out the air of last preheating.
Through said process, Part I flue gas has passed through twice recycling, and Part II flue gas is recycled through three times, and the overwhelming majority of flue gas heat is all recovered utilization, and flue gas utilization rate is improved; Secondly, the air that boiler combustion needs has also passed through twice preheating, the air preheater too high problem of loading while having avoided adopting a preheating; Finally, the Part II flue gas distributing has been saved the energy of steam turbine to a great extent, has played good effect.
For further controlling the amount of Part I flue gas and Part II flue gas, the controller being connected with economizer 1 can be set, controller for realize above-mentioned Part I flue gas and Part II flue gas number.
For realizing the control object of controller, controller generally has comparator, this comparator is for relatively sending into actual temperature and the predetermined temperature of the air of boiler, in controller, generally store the predetermined temperature that pre-set air burning need to be satisfied, in the time being free pneumatic transmission to enter boiler, this air has an actual temperature, comparator is by the actual temperature of air and predetermined temperature contrast, if actual temperature is higher than predetermined temperature, controller control reduces the amount of Part I flue gas, if lower than predetermined temperature, controller control increases the amount of Part I flue gas, if just in time equal predetermined temperature or both temperature differences in allowed limits, controller control maintains the amount of Part I flue gas or carries out a small amount of adjustment.
Under normal circumstances, Part I flue gas accounts for 80%~95% of whole flue gases, and Part II flue gas accounts for 5% ~ 20% of whole flue gases.Adopt aforementioned proportion to shunt and be conducive to two-part flue gas and can both carry out preferably heat exchange flue gas, efficiency of utilization is higher.
Above the device of thermal power unit boiler fume afterheat provided by the present invention utilization is described in detail.Applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand device of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.

Claims (4)

1. the device that thermal power unit boiler fume afterheat utilizes, it is characterized in that, comprise economizer, air preheater, flue gas feed-water heater, flue gas heat-exchange unit and air heat exchanger, described economizer is arranged on the exit of boiler, the flue gas of discharging from described economizer is divided into Part I flue gas and Part II flue gas, described Part I smoke gas flow enters described flue gas heat-exchange unit after described air preheater, described Part II smoke gas flow enters described flue gas heat-exchange unit after described flue gas feed-water heater, described flue gas heat-exchange unit is absorbed heat and is passed to described air heat exchanger by conduction oil, the air outlet slit end of described air heat exchanger is connected with the air intlet end of described air preheater,
Described economizer is further connected with for controlling described Part I flue gas and the how many controller of Part II flue gas;
Described controller has comparator, described comparator is for relatively sending into actual temperature and the predetermined temperature of the air of boiler, if higher than predetermined temperature, described controller control reduces the amount of described Part I flue gas, if lower than predetermined temperature, described controller control increases the amount of described Part I flue gas.
2. device as claimed in claim 1, it is characterized in that, described flue gas feed-water heater comprises interconnective flue gas high-pressure feed-water heater and flue gas low-pressure feed heater, the gas approach end of described flue gas high-pressure feed-water heater is connected with described economizer, and the smoke outlet of described flue gas low-pressure feed heater is connected with the gas approach end of described flue gas heat-exchange unit.
3. device as claimed in claim 1, is characterized in that, is also provided with the circulating pump that circulation power is provided for described conduction oil between described flue gas heat-exchange unit and air heat exchanger.
4. the device as described in claims 1 to 3 any one, is characterized in that, described Part II flue gas accounts for 5%~20% of whole flue gases.
CN201210203999.0A 2012-06-15 2012-06-15 Device for boiler flue gas waste heat utilization in thermal power unit Active CN102705810B (en)

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CN103196130B (en) * 2013-04-27 2015-04-08 东南大学 Method and device for gradient utilization of heat of oxygen-enriched combustion unit
CN103438427B (en) * 2013-08-09 2015-06-24 天津诺能达能源科技有限公司 Gas-fired boiler afterheat recovering system and recovering method
CN103776026B (en) * 2014-01-24 2016-04-13 东南大学 A kind of device and method utilizing fume afterheat to reduce high-temperature corrosion of power station boiler
CN103939932A (en) * 2014-04-28 2014-07-23 中冶华天工程技术有限公司 Blast furnace gas boiler flue gas waste heat deep recycling system

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EP1338848B1 (en) * 2002-02-25 2015-09-02 L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Method and apparatus for integrated air separation and heat recovery in a furnace
ZA200304880B (en) * 2003-02-24 2004-05-04 Air Liquide Integrated heat recovery systems and methods for increasing the efficiency of an oxygen-fired furnace.
CN201297882Y (en) * 2008-11-03 2009-08-26 中国石油化工集团公司 Heat-pipe air preheater
CN102401369B (en) * 2010-09-07 2013-08-14 成信绿集成股份有限公司 Method for improving quality of recyclable exhaust waste heat in power plant boiler and progressively utilizing exhaust waste heat
CN102454980B (en) * 2010-10-19 2014-07-16 上海成信建业节能科技有限公司 Method for recycling flue gas waste heat of thermal power plant boiler
CN202056856U (en) * 2011-03-25 2011-11-30 华北电力大学(保定) System for recycling afterheat of flue gas through high-temperature coal economizer
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CN202630026U (en) * 2012-06-15 2012-12-26 黄绍新 Device recycling flue gas waste-heat of boiler of thermal power generating unit

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