CN202675252U - Thermal power generating unit with smoke and feedwater heater - Google Patents
Thermal power generating unit with smoke and feedwater heater Download PDFInfo
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- CN202675252U CN202675252U CN 201220288587 CN201220288587U CN202675252U CN 202675252 U CN202675252 U CN 202675252U CN 201220288587 CN201220288587 CN 201220288587 CN 201220288587 U CN201220288587 U CN 201220288587U CN 202675252 U CN202675252 U CN 202675252U
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- flue gas
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- water heater
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Abstract
The utility model discloses a thermal power generating unit with a smoke and feedwater heater. The thermal power generating unit comprises a boiler, a turbine backheating system and the smoke and feedwater heater, wherein the smoke and feedwater heater is arranged between the tail part of the boiler and the turbine backheating system so as to heat feedwater in the turbine backheating system. Compared with the prior art, the thermal power generating unit has the advantages that the smoke and feedwater heater is additionally arranged between the tail part of the boiler and the turbine backheating system, so that part of low-pressure feedwater or high-pressure feedwater can be heated by waste heat of discharged smoke, the amount of steam pumped from a turbine by the turbine backheating system is reduced, and the amount of work is increased; and therefore, the power generating amount of the thermal power generating unit is increased, the efficiency of the thermal power generating unit is improved, the coal consumption of the thermal power generating unit is reduced during power generating, and the carbon dioxide emission amount is reduced.
Description
Technical field
The utility model relates to the fired power generating unit field, particularly relates 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 to burn in boiler to produce, by the heat energy heating water, makes water become high temperature and produces high-pressure steam, and then a kind of generation mode that is then generated electricity by the steam pushing generator, its generating efficiency can reach 40%.Under the severe situation that day by day consume at the energy, environmental pressure increases day by day, strengthening research solution 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 a large amount of heats, 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 higher, and the excess air coefficient behind the air preheater is larger, and heat loss due to exhaust gas is also larger.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 effectively reducing the heat loss due to exhaust gas in the fired power generating unit, is the present technical issues that need to address of those skilled in the art.
The utility model content
The purpose of this utility model provides a kind of fired power generating unit with flue gas feed-water heater, 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.
For solving the problems of the technologies described above, the utility model provides a kind of fired power generating unit with flue gas feed-water heater, comprise boiler and Steam Turbine Regenerative System, also comprise the flue gas feed-water heater, described flue gas feed-water heater is arranged between described boiler tail and the described Steam Turbine Regenerative System, in order to heat the feedwater in the described Steam Turbine Regenerative System.
Preferably, described 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 heat exchanger tube tube bank in the described heating chamber; Described feed-water inlet header and described feedwater outlet header respectively with the two ends UNICOM of described heat exchanger tube tube bank.
Preferably, described feed-water inlet header is positioned at the smoke outlet of described cavity, and described feedwater outlet header is positioned at the gas approach end of described cavity.
Preferably, economizer and the described flue gas feed-water heater of described steam turbine backheat that described flue gas feed-water heater is arranged at described fired power generating unit are arranged between the economizer and described Steam Turbine Regenerative System of described boiler tail, and the gas approach end of described flue gas feed-water heater and smoke outlet connect respectively the smoke outlet of the air preheater of the smoke outlet of described economizer and described boiler tail.
Preferably, described flue gas feed-water heater comprises the flue gas high-pressure feed-water heater between the high-pressure heater that is arranged at described economizer and described Steam Turbine Regenerative System and is arranged at flue gas low-pressure feed heater between the low-pressure heater of described economizer and described Steam Turbine Regenerative System; The gas approach end of described flue gas high-pressure feed-water heater and smoke outlet respectively connect the smoke outlet of described economizer and the gas approach end of described flue gas low-pressure feed heater, and the smoke outlet of described flue gas low-pressure feed heater connects the smoke outlet of described air preheater.
Preferably, described fired power generating unit with flue gas feed-water heater further comprises air heat exchanger and the flue gas heat-exchange unit that is connected with described air heat exchanger, the air outlet slit end of described air heat exchanger is connected with the air intlet end of described air preheater, and the gas approach end of described flue gas heat-exchange unit is connected with the exhanst gas outlet pipeline of described air preheater; Be provided with circulation line between described air heat exchanger and the described flue gas heat-exchange unit.
Preferably, described flue gas feed-water heater is the flue gas low-pressure feed heater that is arranged between the low-pressure heater of the air preheater of described boiler tail and described Steam Turbine Regenerative System, described flue gas low-pressure feed heater the gas approach end be connected with the smoke outlet of described air preheater.
Preferably, described heat exchanger tube tube bank is the heat exchanger tube tube bank that carbon steel or fiberglass are made.
Preferably, described heat exchanger tube tube bank is the heat exchanger tube tube bank of serpentine configuration layout.
Relative above-mentioned background technology, fired power generating unit with flue gas feed-water heater provided by the utility model comprises boiler and Steam Turbine Regenerative System, also comprise the flue gas feed-water heater, described flue gas feed-water heater is arranged between described boiler tail and the described Steam Turbine Regenerative System, in order to heat the part feedwater in the described 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, the flue gas feed-water heater can be arranged between the economizer and Steam Turbine Regenerative System of boiler tail, also the flue gas feed-water heater can 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 heating Steam Turbine Regenerative System of boiler tail flue gas, thereby reduce Steam Turbine Regenerative System from the demand of drawing gas of 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 that the utility model provides;
Fig. 2 is the left view of flue gas feed-water heater shown in Figure 1;
Work schematic diagram when Fig. 3 is flue gas feed-water heater described in the first specific embodiment between the economizer of described fired power generating unit and Steam Turbine Regenerative System;
Work schematic diagram when Fig. 4 is flue gas feed-water heater described in the second specific embodiment between the air preheater of described fired power generating unit and Steam Turbine Regenerative System.
Among Fig. 1-Fig. 4:
The specific embodiment
Core of the present utility model 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 better the utility model scheme, the utility model is described in further detail below in conjunction with the drawings and specific embodiments.
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 that the utility model provides; Fig. 2 is the left view of flue gas feed-water heater shown in Figure 1; Work schematic diagram when Fig. 3 is flue gas feed-water heater described in the first specific embodiment between the economizer of described fired power generating unit and Steam Turbine Regenerative System; Work schematic diagram when Fig. 4 is flue gas feed-water heater described in the second specific embodiment between the air preheater of described fired power generating unit and Steam Turbine Regenerative System.
Fired power generating unit provided by the utility model comprises the flue gas feed-water heater, described 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 to 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 made for carbon steel or glass-reinforced plastic material can be evenly arranged in the cavity 201 (being shown among Fig. 2) with serpentine configuration, heat exchanger tube can certainly be restrained 204 and be set to other version.
When work, the feedwater that attracts from Steam Turbine Regenerative System enters 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 by feed-water inlet header 202; High-temperature flue gas enters 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.
Described 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 enter the heating surface that uniform temperature is arrived in boiler 11 front air preheats by inner fin.
The Steam Heating feedwater of part merit was done in the Steam Turbine Regenerative System utilization of described fired power generating unit at steam turbine, improve feed temperature.Steam Turbine Regenerative System mainly comprises low-pressure heater 16 and high-pressure heater 15, the low-temp low-pressure condensate water of condenser enters in the low-pressure heater 16, taken out the Steam Heating of coming from steam turbine, then enter oxygen-eliminating device 14 and remove in the feedwater dissolved gas and make feedwater be heated to saturation temperature, then feedwater enters high-pressure heater 15 and is continued heating.
In order to reduce the heat loss due to exhaust gas of fired power generating unit, the flue gas feed-water heater can be arranged on boiler 11 afterbodys, used as the heater that feeds water in the Steam Turbine Regenerative System, to strengthen the utilization of tail flue gas waste heat.
In the first specific embodiment, described flue gas feed-water heater is arranged between economizer 12 and the Steam Turbine Regenerative System, and the gas approach end of described flue gas feed-water heater is connected the smoke outlet of being connected with air preheater with the smoke outlet of economizer 12 and is connected with smoke outlet; The feed-water inlet header 202 of flue gas feed-water heater is introduced in the feedwater of Steam Turbine Regenerative System by water pump 31, collected in feedwater outlet header 203 behind the flue gas, draws and gets back to Steam Turbine Regenerative System, continues by follow-up heater heating.
With reference to figure 3, C1 represents feedwater among the figure, and C2 represents 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.Described 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 the high-pressure feed water of heating 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 the low pressure feed water of heating 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 the flue gas shunting part of economizer 12 discharges to the flue gas feed-water heater.In flue gas high-pressure feed-water heater 21, utilize the water pump 31 of oxygen-eliminating device 14 ports of export with the feed-water inlet header of the high-pressure feed water suction flue gas high-pressure feed-water heater 21 in the oxygen-eliminating device 14, by 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 water pump 31 of condenser (not shown) outlet with the feed-water inlet header of low pressure feed water suction flue gas low-pressure feed heater 22, by 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 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 follow-up heater, continues by the Steam Heating from steam turbine.
It is pointed out that high-pressure feed water after above-mentioned corresponding follow-up heater refers to heat and low pressure feed water 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 enters air preheater 13 and adds heat primary air and Secondary Air, 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, being provided with flue gas high-pressure feed-water heater 21 and flue gas low-pressure feed heater 22, so that the part high-pressure feed water in the steam turbine and part low pressure feed water have obtained heating, thereby the Steam Turbine Regenerative System mesohigh is reduced to the low-pressure heater 16 of the high-pressure heater 15 of water section and the low pressure feed water part demand of drawing gas from steam turbine, steam turbine acting amount increases, can increase the unit generation amount, 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 specific 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, wind and the secondary air inlet end that can be at the smoke outlet of air preheater 13 air preheater 13 arrange air heat exchanger 41 and flue gas heat-exchange unit 42, make the mixed flue gas of discharging from air preheater 13 and flue gas low-pressure feed heater 22 to wind and Secondary Air heating, can utilize further fume afterheat, reduce exhaust gas temperature.
Particularly, be provided with heat transfer medium in the flue gas heat-exchange unit 42, this heat transfer medium can be conduction oil; Mixed flue gas from air preheater 13 and flue gas low-pressure feed heater 22 enters in the flue gas heat-exchange unit 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 enter air heat exchanger 41, wind and the Secondary Air that at first enters in the air heat exchanger 41 heated, wind and Secondary Air after the heating enter air preheater 13 again, and the heat transfer medium conduction oil cools and returns in the flue gas heat-exchange unit 42 by circulation line; Mixed flue gas in the flue gas heat-exchange unit 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 unit 42, a wind and the Secondary Air heating of the waste heat that can utilize further flue gas to entering air preheater 13, can improve further the heat exchange performance of boiler, reduce energy consumption.
With reference to figure 4, C 1 expression feedwater among the figure, C2 represents 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.In the second specific embodiment, described flue gas feed-water heater is 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 '; Enter the feed-water inlet header of flue gas low-pressure feed heater 22 ' by the low-temp low-pressure feedwater of water pump 31 extraction condenser (not shown) outlets, by 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 enters air preheater 13, wind to sending into from pressure fan 17 and Secondary Air heating, the flue gas of discharging from air preheater 13 enters in the flue gas low-pressure feed heater 22 ', 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, so that 16 pairs of demands minimizings from extracted steam from turbine of the low-pressure heater of Steam Turbine Regenerative System mesolow part, thereby so that the unit generation amount increases, unit efficiency is improved.
Here need to prove, 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 utility model 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 Steam Turbine Regenerative System from the amount of drawing gas of 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.
Above fired power generating unit with flue gas feed-water heater provided by the utility model is described in detail.Used specific case herein principle of the present utility model and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof.Should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (9)
1. fired power generating unit with flue gas feed-water heater, comprise boiler and Steam Turbine Regenerative System, it is characterized in that, also comprise the flue gas feed-water heater, described flue gas feed-water heater is arranged between described boiler tail and the described Steam Turbine Regenerative System, in order to heat the feedwater in the described Steam Turbine Regenerative System.
2. the fired power generating unit with flue gas feed-water heater as claimed in claim 1, it is characterized in that, described 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 heat exchanger tube tube bank in the described heating chamber; Described feed-water inlet header and described feedwater outlet header respectively with the two ends UNICOM of described heat exchanger tube tube bank.
3. the fired power generating unit with flue gas feed-water heater as claimed in claim 2 is characterized in that, described feed-water inlet header is positioned at the smoke outlet of described cavity, and described feedwater outlet header is positioned at the gas approach end of described cavity.
4. such as each described fired power generating unit with flue gas feed-water heater of claims 1 to 3, it is characterized in that, described flue gas feed-water heater is arranged between the economizer and described Steam Turbine Regenerative System of described boiler tail, and the gas approach end of described flue gas feed-water heater and smoke outlet connect respectively the smoke outlet of the air preheater of the smoke outlet of described economizer and described boiler tail.
5. the fired power generating unit with flue gas feed-water heater as claimed in claim 4, it is characterized in that, described flue gas feed-water heater comprises the flue gas high-pressure feed-water heater between the high-pressure heater that is arranged at described economizer and described Steam Turbine Regenerative System and is arranged at flue gas low-pressure feed heater between the low-pressure heater of described economizer and described Steam Turbine Regenerative System; The gas approach end of described flue gas high-pressure feed-water heater and smoke outlet respectively connect the smoke outlet of described economizer and the gas approach end of described flue gas low-pressure feed heater, and the smoke outlet of described flue gas low-pressure feed heater connects the smoke outlet of described air preheater.
6. the fired power generating unit with flue gas feed-water heater as claimed in claim 4, it is characterized in that, described fired power generating unit further comprises air heat exchanger and the flue gas heat-exchange unit that is connected with described air heat exchanger, the air outlet slit end of described air heat exchanger is connected with the air intlet end of described air preheater, and the gas approach end of described flue gas heat-exchange unit is connected with the exhanst gas outlet pipeline of described air preheater; Be provided with circulation line between described air heat exchanger and the described flue gas heat-exchange unit.
7. such as each described fired power generating unit with flue gas feed-water heater of claims 1 to 3, it is characterized in that, described flue gas feed-water heater is the flue gas low-pressure feed heater that is arranged between the low-pressure heater of the air preheater of described boiler tail and described Steam Turbine Regenerative System, described flue gas low-pressure feed heater the gas approach end be connected with the smoke outlet of described air preheater.
8. the fired power generating unit with flue gas feed-water heater as claimed in claim 2 is characterized in that, described heat exchanger tube tube bank is the heat exchanger tube tube bank that carbon steel or fiberglass are made.
9. the fired power generating unit with flue gas feed-water heater as claimed in claim 2 is characterized in that, the heat exchanger tube tube bank that described heat exchanger tube tube bank is arranged for serpentine configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220288587 CN202675252U (en) | 2012-06-15 | 2012-06-15 | Thermal power generating unit with smoke and feedwater heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220288587 CN202675252U (en) | 2012-06-15 | 2012-06-15 | Thermal power generating unit with smoke and feedwater heater |
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| CN202675252U true CN202675252U (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220288587 Expired - Lifetime CN202675252U (en) | 2012-06-15 | 2012-06-15 | Thermal power generating unit with smoke and feedwater heater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705809A (en) * | 2012-06-15 | 2012-10-03 | 黄绍新 | Thermal power unit with smoke feed water heater |
-
2012
- 2012-06-15 CN CN 201220288587 patent/CN202675252U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705809A (en) * | 2012-06-15 | 2012-10-03 | 黄绍新 | Thermal power unit with smoke feed water heater |
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