CN102705809A - Thermal power unit with smoke feed water heater - Google Patents
Thermal power unit with smoke feed water heater Download PDFInfo
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- CN102705809A CN102705809A CN2012102027298A CN201210202729A CN102705809A CN 102705809 A CN102705809 A CN 102705809A CN 2012102027298 A CN2012102027298 A CN 2012102027298A CN 201210202729 A CN201210202729 A CN 201210202729A CN 102705809 A CN102705809 A CN 102705809A
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Abstract
The invention discloses a thermal power unit which comprises a boiler, a turbine reheating system and a smoke feed water heater, wherein the smoke feed water heater is arranged between the tail part of the boiler and the turbine reheating system, so as to conveniently heat the feed water in the turbine reheating system. Compared with the prior art, the thermal power unit provided by the invention has the advantages that the smoke feed water heater is additionally arranged between the tail part of the boiler and the turbine reheating system, the waste heat of the discharged smoke can be utilized to heat partial low-temperature feed water or high-pressure feed water, the steam extraction volume from a turbine of the turbine reheating system is reduced and the acting volume of the turbine is increased, so that the generated energy of the thermal power unit is increased, the efficiency of the thermal power unit is increased, the coal consumption of the thermal power unit for generating electricity is reduced and the carbon dioxide emission is reduced.
Description
Technical field
The present invention relates to the fired power generating unit field, particularly relate to a kind of fired power generating unit with flue gas feed-water heater.
Background technology
Thermal power generation is the heat energy that utilizes fossil fuel in boiler, to burn to produce, and adds hot water through heat energy, make water become high temperature and produce high-pressure steam, and then a kind of generation mode that generates electricity then by the steam pushing generator, its generating efficiency can reach 40%.Under the severe situation that consume day by day at the energy, environmental pressure increases day by day, strengthen researching and solving that the thermal power generation unit is energy-conservation, the reduction of discharging problem has become one of key issue that ensures China's sustainable economic development.
When boiler smoke leaves the afterbody heat-transfer area and is air preheater in the thermal power plant; Temperature is about 120 ~ 160 ° of C; Contain great amount of heat, this part heat is not utilized and discharges from chimney, and the percentage that the thermal loss that causes accounts for the input heat is called heat loss due to exhaust gas.Exhaust gas temperature is high more, and the excess air coefficient behind the air preheater is big more, and heat loss due to exhaust gas is also big more.At present, all there is the too high problem of exhaust gas temperature in a lot of thermal power plants, but the effective measures that also do not address this problem because heat loss due to exhaust gas accounts for boiler heat loss proportion maximum, can obviously improve boiler efficiency so reduce exhaust gas temperature.
Therefore, how reducing the heat loss due to exhaust gas in the fired power generating unit effectively, is the present technical issues that need to address of those skilled in the art.
Summary of the invention
The purpose of this invention is to provide a kind of fired power generating unit, this fired power generating unit can effectively utilize smoke exhaust heat, reduces exhaust gas temperature, thereby reduces heat loss due to exhaust gas, improves boiler efficiency.
For solving the problems of the technologies described above; The present invention provides a kind of fired power generating unit; Comprise boiler and Steam Turbine Regenerative System; Also comprise the flue gas feed-water heater, said flue gas feed-water heater is arranged between said boiler tail and the said Steam Turbine Regenerative System, so that heat the feedwater in the said Steam Turbine Regenerative System.
Preferably, said flue gas feed-water heater comprises the feed-water inlet header, the outlet header that feeds water, has the cavity of heating chamber and be arranged on the heat exchanger tube tube bank in the said heating chamber; Said feed-water inlet header and said feedwater outlet header respectively with the two ends UNICOM of said heat exchanger tube tube bank.
Preferably, said feed-water inlet header is positioned at the smoke outlet of said cavity, and said feedwater outlet header is positioned at the gas approach end of said cavity.
Preferably; Economizer and the said flue gas feed-water heater of said steam turbine backheat that said flue gas feed-water heater is arranged at said fired power generating unit are arranged between the economizer and said Steam Turbine Regenerative System of said boiler tail, and the gas approach end of said flue gas feed-water heater and smoke outlet are connected the smoke outlet of air preheater of smoke outlet and the said boiler tail of said economizer respectively.
Preferably, said flue gas feed-water heater comprises the flue gas high-pressure feed-water heater between the high-pressure heater that is arranged at said economizer and said Steam Turbine Regenerative System and is arranged at the flue gas low-pressure feed heater between the low-pressure heater of said economizer and said Steam Turbine Regenerative System; The gas approach end of said flue gas high-pressure feed-water heater is connected the smoke outlet of said economizer and the gas approach end of said flue gas low-pressure feed heater respectively with smoke outlet, and the smoke outlet of said flue gas low-pressure feed heater connects the smoke outlet of said air preheater.
Preferably; Said fired power generating unit further comprises air heat exchanger and the flue gas heat exchange device that is connected with said air heat exchanger; The air outlet slit end of said air heat exchanger is connected with the air intlet end of said air preheater, and the gas approach end of said flue gas heat exchange device is connected with the exhanst gas outlet pipeline of said air preheater; Be provided with circulation line between said air heat exchanger and the said flue gas heat exchange device.
Preferably; Said flue gas feed-water heater is the flue gas low-pressure feed heater that is arranged between the low-pressure heater of air preheater and said Steam Turbine Regenerative System of said boiler tail, said flue gas low-pressure feed heater the gas approach end be connected with the smoke outlet of said air preheater.
Preferably, said heat exchanger tube tube bank is the heat exchanger tube tube bank that carbon steel or fiberglass are processed.
Preferably, said heat exchanger tube tube bank is the heat exchanger tube tube bank of serpentine configuration layout.
Above-mentioned background is technological relatively; Fired power generating unit provided by the present invention comprises boiler and Steam Turbine Regenerative System; Also comprise the flue gas feed-water heater; Said flue gas feed-water heater is arranged between said boiler tail and the said Steam Turbine Regenerative System, so that heat the part feedwater in the said Steam Turbine Regenerative System.Between the boiler tail of fired power generating unit and Steam Turbine Regenerative System, be provided with the flue gas feed-water heater; Can the flue gas feed-water heater be arranged between the economizer and Steam Turbine Regenerative System of boiler tail; Also can the flue gas feed-water heater be arranged between the air preheater and Steam Turbine Regenerative System of boiler tail, two kinds of set-up modes all can effectively utilize the part feedwater in the heat Steam Turbine Regenerative System of boiler tail flue gas, thereby reduce the draw gas demand of Steam Turbine Regenerative System from steam turbine; Increase the unit generation amount; Improve the operational efficiency of unit, reduce the unit generation coal consumption, reduce CO2 emission.
Description of drawings
Fig. 1 is the front view of a kind of specific embodiment of flue gas feed-water heater of fired power generating unit provided by the present invention;
Fig. 2 is the left view of flue gas feed-water heater shown in Figure 1;
Work sketch map when Fig. 3 is a flue gas feed-water heater described in first kind of specific embodiment between the economizer of said fired power generating unit and Steam Turbine Regenerative System;
Work sketch map when Fig. 4 is a flue gas feed-water heater described in second kind of specific embodiment between the air preheater of said fired power generating unit and Steam Turbine Regenerative System.
Among Fig. 1-Fig. 4:
The specific embodiment
Core of the present invention provides a kind of fired power generating unit, and this fired power generating unit can effectively utilize smoke exhaust heat, reduces exhaust gas temperature, thereby reduces heat loss due to exhaust gas, improves boiler efficiency.
In order to make those skilled in the art person understand the present invention program better, the present invention is done further detailed description below in conjunction with the accompanying drawing and the specific embodiment.
Please refer to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, Fig. 1 is the front view of a kind of specific embodiment of flue gas feed-water heater of fired power generating unit provided by the present invention; Fig. 2 is the left view of flue gas feed-water heater shown in Figure 1; Work sketch map when Fig. 3 is a flue gas feed-water heater described in first kind of specific embodiment between the economizer of said fired power generating unit and Steam Turbine Regenerative System; Work sketch map when Fig. 4 is a flue gas feed-water heater described in second kind of specific embodiment between the air preheater of said fired power generating unit and Steam Turbine Regenerative System.
Fired power generating unit provided by the present invention comprises the flue gas feed-water heater; Said flue gas feed-water heater comprises cavity 201 with heating chamber, is arranged on the heat exchanger tubes tube bank 204 in the cavity 201, is connected feed-water inlet header 202 and feedwater outlet header 203 that heat exchanger tube is restrained 204 two ends.
Feed-water inlet header 202 is positioned at the same side with smoke outlet B, and feedwater outlet header 203 is positioned at the same side with gas approach end A, makes the flow direction of flue gas and feedwater opposite, can strengthen heat exchange, improves the heating-up temperature of feedwater.
The tube bank that heat exchanger tube tube bank 204 can be processed for carbon steel or glass-reinforced plastic material can be evenly arranged in the cavity 201 (being shown among Fig. 2) with serpentine configuration, can certainly heat exchanger tube be restrained 204 and be set to other version.
When work, the feedwater that attracts from Steam Turbine Regenerative System gets into the feed-water inlet header 202 that is positioned at smoke outlet B, will feed water uniform distribution to heat exchanger tube tube bank 204 through feed-water inlet header 202; High-temperature flue gas gets in the cavity 201 from gas approach end A, and the feedwater in the exchange heat pipe tube bank 204 is heated, and the flue gas of release heat is discharged from smoke outlet B; Feedwater absorbs flue gas heat, and temperature raises, and the feedwater after the heating is pooled in the feedwater outlet header 203 of gas approach end A, is drawn and gets back to Steam Turbine Regenerative System.
Said fired power generating unit also comprises boiler 11, and the afterbody of boiler 11 is provided with economizer 12 and air preheater 13; Economizer 12 is the heating surfaces that in boiler 11 back-end ductworks boiler feedwater are heated into the saturation water under the drum pressure; Air preheater 13 is that the flue gas in boiler 11 back-end ductworks will get into the heating surface that uniform temperature is arrived in boiler 11 preceding air preheats through inner fin.
The Steam Turbine Regenerative System of said fired power generating unit is utilized in the Steam Heating feedwater that steam turbine was made the part merit, improves feed temperature.Steam Turbine Regenerative System mainly comprises low-pressure heater 16 and high-pressure heater 15; The low-temp low-pressure condensate of condenser gets in the low-pressure heater 16; Taken out the Steam Heating of coming from steam turbine; Then get into oxygen-eliminating device 14 and remove in the feedwater dissolved gas and make feedwater be heated to saturation temperature, feedwater gets into high-pressure heater 15 and is continued heating then.
In order to reduce the heat loss due to exhaust gas of fired power generating unit, can the flue gas feed-water heater be arranged on boiler 11 afterbodys, it is used as the heater that feeds water in the Steam Turbine Regenerative System, to strengthen the tail flue gas afterheat utilization.
In first kind of specific embodiment; Said flue gas feed-water heater is arranged between economizer 12 and the Steam Turbine Regenerative System, and the gas approach end of said flue gas feed-water heater is connected with the smoke outlet of economizer 12 and the smoke outlet of air preheater 13 respectively with smoke outlet; The feedwater of Steam Turbine Regenerative System is collected in feedwater outlet header 203 through the feed-water inlet header 202 of water pump 31 introducing flue gas feed-water heaters after the flue gas heating, draw and get back to Steam Turbine Regenerative System, continues by follow-up heater heating.
With reference to figure 3, C 1 expression feedwater among the figure, C2 representes that steam, C3 represent that flue gas, C4 represent air, arrow has been indicated above-mentioned each medium flow direction in the course of the work.Said flue gas feed-water heater comprises flue gas high-pressure feed-water heater 21 and flue gas low-pressure feed heater 22; Flue gas high-pressure feed-water heater 21 is arranged between the high-pressure heater 15 of economizer 12 and Steam Turbine Regenerative System, is used for heating the high-pressure feed water of Steam Turbine Regenerative System; Flue gas low-pressure feed heater 22 is arranged between the low-pressure heater 16 of economizer 12 and Steam Turbine Regenerative System, is used for heating the low pressure feed water of Steam Turbine Regenerative System.
Particularly; The smoke outlet of economizer 12 connects the gas approach end of flue gas high-pressure feed-water heater 21; The smoke outlet of high-pressure feed-water heater 21 connects the gas approach end of low-pressure feed heater 22; The smoke outlet of low-pressure feed heater 22 connects the port of export of air preheater 13, is about to a part of flue gas feed-water heater of giving of flue gas shunting that economizer 12 is discharged.In flue gas high-pressure feed-water heater 21; Utilize the feed-water inlet header of the water pump 31 of oxygen-eliminating device 14 ports of export with the high-pressure feed water suction flue gas high-pressure feed-water heater 21 in the oxygen-eliminating device 14; Through the feedwater distributed architecture on the feed-water inlet header high-pressure feed water is evenly distributed in the heat exchanger tube tube bank, the flue gas that comes from economizer 12 shuntings heats high-pressure feed water; In flue gas low-pressure feed heater 22; Utilize the feed-water inlet header of the water pump 31 of condenser (not shown) outlet with low pressure feed water suction flue gas low-pressure feed heater 22; Through the feedwater distributed architecture on the feed-water inlet header low pressure feed water is evenly distributed in the heat exchanger tube tube bank; By the flue gas heating that sucks from flue gas high-pressure feed-water heater 21; High-pressure feed water after the heating and low pressure feed water are drawn respectively to be got back in the Steam Turbine Regenerative System in the corresponding subsequent heater, continues by the Steam Heating from steam turbine.
It is pointed out that above-mentioned corresponding subsequent heater is meant that high-pressure feed water and low pressure feed water after the heating in drawing back-steam turbine heat regenerative system, should introduce the feedwater position suitable with its temperature after heating and carry out follow-up heating.
Another part flue gas of discharging in the economizer 12 still gets into air preheater wind of 13 heating and secondary wind, and the flue gas of discharging in the flue gas low-pressure feed heater 22 imports in the exhanst gas outlet pipeline of air preheater 13, and mixed flue gas is discharged from thermal power plant's chimney.
Owing in economizer 12 and Steam Turbine Regenerative System, be provided with flue gas high-pressure feed-water heater 21 and flue gas low-pressure feed heater 22; Make part high-pressure feed water and part low pressure feed water in the steam turbine obtain heating; Thereby make the Steam Turbine Regenerative System mesohigh reduce for the high-pressure heater 15 of water section and the draw gas demand of low pressure feed water low-pressure heater 16 partly from steam turbine; Steam turbine acting amount increases, and can increase the unit generation amount, and unit efficiency is improved; The exhaust gas temperature that makes simultaneously reduces, and heat loss due to exhaust gas reduces.
Here need to prove; In the practical implementation process; According to actual needs; Also the feedwater of flue gas high-pressure feed-water heater heating high-pressure can only be set between the high-pressure section of economizer 12 and Steam Turbine Regenerative System, or flue gas low-pressure feed heater heating low pressure feed water only is set between the low-pressure section of economizer 12 and Steam Turbine Regenerative System.As long as the setting of flue gas feed-water heater can effectively utilize smoke discharging residual heat, reduce exhaust gas temperature, improve boiler efficiency and get final product.
Can also make further improvement to this embodiment.
Further; The wind and the secondary wind entrance point that can be air preheater 13 at the smoke outlet of air preheater 13 are provided with air heat exchanger 41 and flue gas heat exchange device 42; The mixed flue gas of discharging from air preheater 13 and flue gas low-pressure feed heater 22 is heated with secondary wind a wind; Can utilize fume afterheat further, reduce exhaust gas temperature.
Particularly, be provided with heat transfer medium in the flue gas heat exchange device 42, this heat transfer medium can be conduction oil; Mixed flue gas from air preheater 13 and flue gas low-pressure feed heater 22 gets in the flue gas heat exchange device 42; Its heat transfer medium conduction oil can absorb the waste heat of mixed flue gas and heat up; Through the loss of conduction oil oil pump 32 supplementary pressures; Conduction oil after the heating can get into air heat exchanger 41; Wind and secondary wind at first getting in the air heat exchanger 41 heat, and wind and secondary wind after the heating get into air preheater 13 again, and the heat transfer medium conduction oil cools after circulation line returns in the flue gas heat exchange device 42; Mixed flue gas in the flue gas heat exchange device 42 is discharged from chimney.
Because the smoke outlet at air preheater 13 is provided with air heat exchanger 41 and flue gas heat exchange device 42; The waste heat that can utilize flue gas further heats with secondary wind a wind that gets into air preheater 13; Can improve the heat exchange performance of boiler further, reduce energy consumption.
With reference to figure 4, C1 representes feedwater among the figure, and C2 representes that steam, C3 represent that flue gas, C4 represent air, and arrow has been indicated above-mentioned each medium flow direction in the course of the work.In second kind of specific embodiment, said flue gas feed-water heater is a flue gas low-pressure feed heater 22 ', is arranged between the low-pressure heater 16 of air preheater 13 and Steam Turbine Regenerative System.Particularly, the smoke outlet of air preheater 13 connects the gas approach end of flue gas low-pressure feed heater 22 '; The low-temp low-pressure feedwater of extracting the outlet of condenser (not shown)s through water pump 31 gets into the feed-water inlet header of flue gas low-pressure feed heater 22 ', and through the feedwater distributed architecture of feed-water inlet header, low pressure feed water is evenly distributed in the heat exchanger tube tube bank.
During work; The flue gas that economizer 12 is discharged gets into air preheater 13; Wind to sending into from pressure fan 17 and secondary wind heating, the flue gas of discharging from air preheater 13 gets in the flue gas low-pressure feed heater 22 ', and heating is from the low-temp low-pressure feedwater of Steam Turbine Regenerative System low-pressure section; Can discharge from flue gas low-pressure feed heater 22 ' after the flue gas release heat, the flue-gas temperature of discharge is reduced.Low pressure feed water in the flue gas low-pressure feed heater 22 ' can directly be introduced oxygen-eliminating device 14 after absorbing the flue gas heat intensification, continued heating by follow-up heater.So, make 16 pairs of demands of low-pressure heater of Steam Turbine Regenerative System mesolow part reduce, thereby make the unit generation amount increase that unit efficiency is improved from extracted steam from turbine.
Here need to prove that when heated low pressure feed water was drawn back-steam turbine heat regenerative system, follow-up heating was carried out in the suitable position of low pressure feed water temperature after also can introducing other and heating, and is not limited to oxygen-eliminating device 14.
Compared with prior art, fired power generating unit provided by the present invention has been set up the flue gas feed-water heater between boiler tail and Steam Turbine Regenerative System, can utilize the waste heat of smoke evacuation that part low pressure feed water or high-pressure feed water are heated; Reduce the draw gas amount of Steam Turbine Regenerative System from steam turbine; Increase the acting amount of steam turbine, thereby increase the fired power generating unit generated energy, improve unit efficiency; Reduce the unit generation coal consumption, reduce CO2 emission.
More than the fired power generating unit with flue gas feed-water heater provided by the present invention has been carried out detailed introduction.Used concrete example among this paper principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle 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 claim of the present invention.
Claims (9)
1. fired power generating unit; Comprise boiler and Steam Turbine Regenerative System, it is characterized in that, also comprise the flue gas feed-water heater; Said flue gas feed-water heater is arranged between said boiler tail and the said Steam Turbine Regenerative System, so that heat the feedwater in the said Steam Turbine Regenerative System.
2. fired power generating unit as claimed in claim 1 is characterized in that, said flue gas feed-water heater comprises the feed-water inlet header, the outlet header that feeds water, have the cavity of heating chamber and be arranged on the heat exchanger tube tube bank in the said heating chamber; Said feed-water inlet header and said feedwater outlet header respectively with the two ends UNICOM of said heat exchanger tube tube bank.
3. fired power generating unit as claimed in claim 2 is characterized in that said feed-water inlet header is positioned at the smoke outlet of said cavity, and said feedwater outlet header is positioned at the gas approach end of said cavity.
4. like each described fired power generating unit of claim 1 to 3; It is characterized in that; Said flue gas feed-water heater is arranged between the economizer and said Steam Turbine Regenerative System of said boiler tail, and the gas approach end of said flue gas feed-water heater and smoke outlet are connected the smoke outlet of air preheater of smoke outlet and the said boiler tail of said economizer respectively.
5. fired power generating unit as claimed in claim 4; It is characterized in that said flue gas feed-water heater comprises the flue gas high-pressure feed-water heater between the high-pressure heater that is arranged at said economizer and said Steam Turbine Regenerative System and is arranged at the flue gas low-pressure feed heater between the low-pressure heater of said economizer and said Steam Turbine Regenerative System; The gas approach end of said flue gas high-pressure feed-water heater is connected the smoke outlet of said economizer and the gas approach end of said flue gas low-pressure feed heater respectively with smoke outlet, and the smoke outlet of said flue gas low-pressure feed heater connects the smoke outlet of said air preheater.
6. fired power generating unit as claimed in claim 4; It is characterized in that; Said fired power generating unit further comprises air heat exchanger and the flue gas heat exchange device that is connected with said air heat exchanger; The air outlet slit end of said air heat exchanger is connected with the air intlet end of said air preheater, and the gas approach end of said flue gas heat exchange device is connected with the exhanst gas outlet pipeline of said air preheater; Be provided with circulation line between said air heat exchanger and the said flue gas heat exchange device.
7. like each described fired power generating unit of claim 1 to 3; It is characterized in that; Said flue gas feed-water heater is the flue gas low-pressure feed heater that is arranged between the low-pressure heater of air preheater and said Steam Turbine Regenerative System of said boiler tail, said flue gas low-pressure feed heater the gas approach end be connected with the smoke outlet of said air preheater.
8. fired power generating unit as claimed in claim 2 is characterized in that, said heat exchanger tube tube bank is the heat exchanger tube tube bank that carbon steel or fiberglass are processed.
9. fired power generating unit as claimed in claim 2 is characterized in that, the heat exchanger tube tube bank that said heat exchanger tube tube bank is arranged for serpentine configuration.
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| CN2012102027298A CN102705809A (en) | 2012-06-15 | 2012-06-15 | Thermal power unit with smoke feed water heater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102027298A CN102705809A (en) | 2012-06-15 | 2012-06-15 | Thermal power unit with smoke feed water heater |
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| CN2012102027298A Pending CN102705809A (en) | 2012-06-15 | 2012-06-15 | Thermal power unit with smoke feed water heater |
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| CN103196136A (en) * | 2013-04-27 | 2013-07-10 | 东南大学 | Method and device for gradient utilization of oxygen-enriched combustion heat |
| CN103453513A (en) * | 2013-09-04 | 2013-12-18 | 济南海普电力节能科技有限公司 | Cascade utilization method and device of waste gas of flue gas of boiler for thermal power unit |
| CN108679638A (en) * | 2018-05-29 | 2018-10-19 | 上海电力学院 | A kind of condensation-reheating integration plume disappears white system |
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| CN108679638A (en) * | 2018-05-29 | 2018-10-19 | 上海电力学院 | A kind of condensation-reheating integration plume disappears white system |
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Application publication date: 20121003 |