CN102401369B - Method for improving quality of recyclable exhaust waste heat in power plant boiler and progressively utilizing exhaust waste heat - Google Patents
Method for improving quality of recyclable exhaust waste heat in power plant boiler and progressively utilizing exhaust waste heat Download PDFInfo
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- CN102401369B CN102401369B CN201010274101XA CN201010274101A CN102401369B CN 102401369 B CN102401369 B CN 102401369B CN 201010274101X A CN201010274101X A CN 201010274101XA CN 201010274101 A CN201010274101 A CN 201010274101A CN 102401369 B CN102401369 B CN 102401369B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a method for improving the quality of recyclable exhaust waste heat in a power plant boiler and progressively utilizing the exhaust waste heat. A heat source for heating air entering an air pre-heater is connected in series to the front end of the air pre-heater of a boiler air input cold air duct, a first heat exchanger is connected in series to a boiler exhaust flue, and the first heat exchanger is arranged in back of the air pre-heater of the boiler exhaust flue and in front of a desulfurizing tower and used for heating boiler water of a boiler heat recovery system. By using the method, the quality of the recyclable exhaust waste heat can be effectively improved, so that the recycling efficiency of the boiler exhaust waste heat is higher, the efficiency of the boiler and a steam turbine is improved, and the energy consumption for power generation is reduced.
Description
Technical field
The present invention relates to a kind of method that improves the recyclable smoke discharging residual heat quality of power plant boiler and utilize step by step.
Background technology
Thermal power plant's coal-burning boiler provides the generated energy of generating set, and simultaneously a large amount of heat energy are discharged at chimney with boiler smoke; Advocating energetically under the background of energy-saving and emission-reduction now, for this coal-burning boiler of thermal power plant, how to reduce the smoke evacuation heat-energy losses, thereby energy savings, the protection environment very important meaning is arranged.
The operating flue gas loss of power plant boiler is a most important heat loss, if can the smoke exhaust heat of boiler maximized reclaim and the generating set that is used in, then can improve boiler efficiency, economic benefit and social benefit.The method of recycling for the power plant boiler smoke discharging residual heat had in the past:
One, as shown in Figure 1, heat exchanger 2 is arranged in the exit flue 3 of boiler 1, the smoke discharging residual heat of the boiler 1 that reclaims is used for the boiler feedwater of heating boiler heat regenerative system 4 separately, thereby the steam that reduces steam turbine 5 draws gas, to improve the generating efficiency of steam turbine 5; In the method, the temperature at general heat exchanger 2 two ends is respectively 115 ℃ and 90 ℃, and the temperature difference is 25 ℃, the quality of fume afterheat is not high, therefore heat exchanger 2 can only be used for also lower low-pressure heater 41 of heating boiler heat regenerative system 4 temperature, and the heat of recovery is few, DeGrain.Lower thus exhaust gas temperature makes heat exchanger efficiency reduce, and does not have the effect of heating boiler feedwater.
They are two years old, as shown in Figure 2, heat exchanger 2 is arranged in the exit flue 3 of boiler 1, flue gas heater 8 is located between the desulfurizing tower 6 and chimney 7 of boiler exhaust gas flue 3, the smoke discharging residual heat of the boiler 1 that reclaims is used for flue gas heater 8 behind exit flue 3 desulfurizing towers 6 of boiler 1 separately, to improve the flue-gas temperature after desulfurization, and improved exhaust gas temperature through chimney 7, so reduce flue gas to chimney 7 corrosion in, the smoke evacuation height of the chimney 7 that raise has reduced environmental pollution.In the method, the temperature at general heat exchanger 2 two ends is respectively 115 ℃ and 90 ℃, and the temperature difference is 25 ℃, and the quality of same fume afterheat is not high, and heat exchanger 2 also can only be used for adding the lower flue gas of temperature behind the thermally desulfurizing, the raising boiler efficiency is not exerted an influence.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method that improves the recyclable smoke discharging residual heat quality of power plant boiler and utilize step by step, utilize this method can effectively improve the recyclable smoke discharging residual heat quality of boiler, make that the recycling efficient of boiler exhaust gas waste heat is higher, improve boiler and Efficiency of Steam Turbine, reduced the generating energy consumption.
For solving the problems of the technologies described above, the method that the present invention improves the recyclable smoke discharging residual heat quality of power plant boiler and utilization step by step is used for the air that heating enters air preheater at the air preheater front end serial connection thermal source of boiler air input cold air duct, serial connection first heat exchanger in the boiler exhaust gas flue, first heat exchanger be located at after the air preheater of boiler exhaust gas flue, before the desulfurizing tower and be used for the boiler feedwater of heating boiler heat regenerative system.
Above-mentioned thermal source can be air heater, second heat exchanger is located at before the desulfurizing tower of boiler exhaust gas flue, after first heat exchanger, the second heat exchanger heat offers air heater by fluid media (medium), be used for improving the air themperature that enters described air preheater, transmit heat by fluid media (medium) between air heater and second heat exchanger, fluid media (medium) is water, or anti-icing fluid.
The heat of above-mentioned thermal source also can be used for improving the air themperature that enters described air preheater from extracted steam from turbine.
For taking full advantage of fume afterheat, be connected in series flue gas heater between the desulfurizing tower of this method in the boiler exhaust gas flue and the chimney, the heat of flue gas heater is provided by first heat exchanger, perhaps the heat of flue gas heater is provided by second heat exchanger, transmit heat by fluid media (medium) between flue gas heater and first heat exchanger or second heat exchanger, fluid media (medium) is water, or anti-icing fluid.
For further utilizing fume afterheat, this method also is connected in series the 3rd heat exchanger in the boiler exhaust gas flue, the 3rd heat exchanger is located at before the desulfurizing tower of boiler exhaust gas flue, after first heat exchanger, the 3rd heat exchanger heat provides flue gas heater to be used to improve flue-gas temperature behind desulfurizing tower, transmit heat by fluid media (medium) between flue gas heater and the 3rd heat exchanger, fluid media (medium) is water, or anti-icing fluid.
Arrange and be connected for convenient, first heat exchanger can be located at after the air preheater of boiler exhaust gas flue, before the deduster, perhaps first heat exchanger be located at after the deduster of boiler exhaust gas flue, before the air-introduced machine.
The second above-mentioned heat exchanger is located at before the desulfurizing tower in the boiler exhaust gas flue, after the booster fan.
Be the heat exchange effect that improves boiler feedwater and the heat exchange area that reduces by first heat exchanger, the heat transferring medium pipeline of the first above-mentioned heat exchanger is serially connected with in the boiler heat regenerative system by flow control valve, is used for the whole boiler feedwaters of heating.When first heat exchanger was all flowed through in boiler feedwater, the corresponding increase of flow made the first less heat exchanger of heat exchange area have same heat exchange effect.
For making things convenient for the utilization of fume afterheat, the heat between above-mentioned air heater and second heat exchanger transmits medium can carry out the adjusting of flow size by variable frequency pump or flow control valve.
For making things convenient for the utilization of fume afterheat, the heat between above-mentioned flue gas heater and first heat exchanger, between flue gas heater and second heat exchanger transmits medium and can carry out the adjusting of flow size by variable frequency pump or flow control valve.
For making things convenient for the utilization of fume afterheat, the heat between above-mentioned flue gas heater and the 3rd heat exchanger transmits medium can carry out the adjusting of flow size by variable frequency pump or flow control valve.
Because improving the method for the recyclable smoke discharging residual heat quality of power plant boiler and utilization step by step, the present invention adopted technique scheme, namely the air preheater front end serial connection thermal source at boiler air input cold air duct is used for the air that heating enters air preheater, serial connection first heat exchanger in the boiler exhaust gas flue, first heat exchanger be located at after the air preheater of boiler exhaust gas flue, before the desulfurizing tower and be used for the boiler feedwater of heating boiler heat regenerative system.Utilize this method can effectively improve the recyclable smoke discharging residual heat quality of boiler, make that the recycling efficient of boiler exhaust gas waste heat is higher, improved boiler and Efficiency of Steam Turbine, reduced the generating energy consumption.
Description of drawings
The present invention is described in further detail below in conjunction with drawings and embodiments:
Fig. 1 is the connection diagram of employing heat exchanger heating boiler heat regenerative system low-pressure heater,
Fig. 2 discharges fume through the connection diagram of flue gas after desulfurization temperature for adopting the heat exchanger heating boiler,
Fig. 3 is principle schematic of the present invention,
Fig. 4 has increased the principle schematic of other heat exchangers for the present invention.
The specific embodiment
As shown in Figure 3, the method that the present invention improves the recyclable smoke discharging residual heat quality of power plant boiler and utilization step by step is used for the air that heating enters air preheater 10 at the air preheater 10 front ends serial connection thermal source 9 of boiler 1 air input cold air duct, in boiler 1 exit flue 3 serial connection first heat exchanger 21, the first heat exchangers 21 be located at after the air preheater 10 of boiler exhaust gas flue 3, before the desulfurizing tower 6 and be used for the boiler feedwater of heating boiler heat regenerative system 4.
Above-mentioned thermal source 9 can be air heater, second heat exchanger 23 is located at before the desulfurizing tower 6 of boiler exhaust gas flue 3, after first heat exchanger 21, second heat exchanger, 23 heats offer air heater by fluid media (medium), be used for improving the air themperature that enters described air preheater 10, transmit heat by fluid media (medium) between air heater and second heat exchanger 23, fluid media (medium) is water, or anti-icing fluid.
The heat of above-mentioned thermal source 9 also can draw gas from steam turbine 5, is used for improving the air themperature that enters described air preheater 10.
As shown in Figure 4, for taking full advantage of fume afterheat, be connected in series flue gas heater 8 between the desulfurizing tower 6 of this method in boiler exhaust gas flue 3 and the chimney 7, the heat of flue gas heater 8 is provided by first heat exchanger 21, perhaps the heat of flue gas heater 8 is provided by second heat exchanger 23, transmit heat by fluid media (medium) between flue gas heater 8 and first heat exchanger 21 or second heat exchanger 23, fluid media (medium) is water, or anti-icing fluid.
As shown in Figure 4, for further utilizing fume afterheat, this method also is connected in series the 3rd heat exchanger 22 in boiler exhaust gas flue 3, the 3rd heat exchanger 22 is located at before the desulfurizing tower 6 of boiler exhaust gas flue 3, after first heat exchanger 21, the 3rd heat exchanger 22 heats provide flue gas heater 8 to be used for the flue-gas temperature of raising behind desulfurizing tower 6, transmit heat by fluid media (medium) between flue gas heater 8 and the 3rd heat exchanger 22, fluid media (medium) is water, or anti-icing fluid.
Arrange and be connected for convenient, first heat exchanger 21 can be located at after the air preheater 10 of boiler exhaust gas flue 3, before the deduster 11, perhaps first heat exchanger 21 be located at after the deduster 11 of boiler exhaust gas flue 3, before the air-introduced machine 12.
The second above-mentioned heat exchanger 23 is located at before the desulfurizing tower 6 in the boiler exhaust gas flue 3, after the booster fan 13.
As shown in Figure 3, be the heat exchange effect that improves boiler feedwater and the heat exchange area that reduces by first heat exchanger 21, the heat transferring medium pipeline of the first above-mentioned heat exchanger 21 is serially connected with in the boiler heat regenerative system 4 by flow control valve 43, is used for the whole boiler feedwaters of heating.When first heat exchanger 21 was all flowed through in boiler feedwater, the corresponding increase of flow made the first less heat exchanger of heat exchange area have same heat exchange effect.
For making things convenient for the utilization of fume afterheat, the heat between above-mentioned air heater and second heat exchanger 23 transmits medium is regulated flow by variable frequency pump 24 or flow control valve size.
For making things convenient for the utilization of fume afterheat, the heat between above-mentioned flue gas heater and first heat exchanger 21, between flue gas heater and second heat exchanger 23 transmits medium is regulated flow by variable frequency pump or flow control valve size.
As shown in Figure 4, for making things convenient for the utilization of fume afterheat, the heat between above-mentioned flue gas heater 8 and the 3rd heat exchanger 22 transmits medium is regulated flow by variable frequency pump 25 or flow control valve size.
This method is through practical application, owing to be connected in series thermal source at the air preheater front end, make the air themperature that enters air preheater be increased to 68 ℃ by room temperature, the air themperature that enters boiler after the air preheater heating is 340 ℃, boiler exhaust gas is after air preheater carries out heat exchange, the flue-gas temperature of discharging air preheater can be risen to 162 ℃ by original 131 ℃, 31 ℃ difference variation is arranged, the quality of residual heat from boiler fume has greatly improved, value also just improves greatly, makes the step by step utilization of boiler smoke in exit flue become possibility; Because flue-gas temperature reduces in exit flue step by step, therefore will be located at prime for first heat exchanger of heating boiler feedwater, and the 3rd heat exchanger that is used for the heating flue gas after desulfurization is located at the back level, the temperature at prime heat exchanger two ends is respectively 155 ℃ and 130 ℃, therefore can be used for the boiler feedwater of heating boiler heat regenerative system, the steam that has further reduced steam turbine draws gas, and effectively improves the generating efficiency of steam turbine; The temperature at level heat exchanger two ends, back is respectively 110 ℃ and 80 ℃, the flue-gas temperature of this moment is lower, but still can be by the flue gas of flue gas heater heating behind desulfurizing tower, make the flue-gas temperature enter chimney be raised to 80 ℃ from original 50 ℃, improve exhaust gas temperature, the raising of exhaust gas temperature has promoted the smoke evacuation of chimney highly, reducing flue gas in the chimney corrosion, reduced the pollution of smoke evacuation to environment.
For more taking full advantage of fume afterheat, thermal source in this method also can obtain from fume afterheat, can be connected in series second heat exchanger again with back level heat exchanger at above-mentioned prime heat exchanger, the temperature at these heat exchanger two ends is respectively 130 ℃ and 110 ℃, air preheater front end serial connection air heater at boiler air input cold air duct, the heat of this second heat exchanger provides air heater to be used to heat the air of room temperature, make the air themperature that enters air preheater reach 68 ℃, to improve air preheater smoke discharging residual heat quality.
According to the heating principle, introduce extracted steam from turbine or be connected in series an electric heater or steam heater etc. at the air preheater front end of boiler air input cold air duct, can play the effect that adds hot-air equally.
This method is by the air of heating boiler air input cold air duct, improved the quality of residual heat from boiler fume, by heat exchanger residual heat from boiler fume is recycled step by step, effectively improved the operational efficiency of boiler and steam turbine, reduce energy consumptions such as fire coal, had good social benefit and economic benefit.
Claims (10)
1. one kind is improved the method that the recyclable smoke discharging residual heat quality of power plant boiler is also utilized step by step, it is characterized in that: this method is used for the air that heating enters air preheater at the air preheater front end serial connection thermal source of boiler air input cold air duct, serial connection first heat exchanger in the boiler exhaust gas flue, first heat exchanger is located at after the air preheater of boiler exhaust gas flue, also be used for the boiler feedwater of heating boiler heat regenerative system before the desulfurizing tower, described thermal source is air heater, second heat exchanger is located at before the desulfurizing tower of boiler exhaust gas flue, after first heat exchanger, the second heat exchanger heat offers air heater by fluid media (medium), be used for improving the air themperature that enters described air preheater, transmit heat by fluid media (medium) between air heater and second heat exchanger, fluid media (medium) is water, or anti-icing fluid.
2. the recyclable smoke discharging residual heat quality of raising power plant boiler according to claim 1 and the method for utilization step by step is characterized in that: the heat of described thermal source is used for improving the air themperature that enters described air preheater from extracted steam from turbine.
3. the recyclable smoke discharging residual heat quality of raising power plant boiler according to claim 1 and the method for utilization step by step, it is characterized in that: be connected in series flue gas heater between the desulfurizing tower of this method in the boiler exhaust gas flue and the chimney, the heat of flue gas heater is provided by first heat exchanger, perhaps the heat of flue gas heater is provided by second heat exchanger, transmit heat by fluid media (medium) between flue gas heater and first heat exchanger or second heat exchanger, fluid media (medium) is water, or anti-icing fluid.
4. the recyclable smoke discharging residual heat quality of raising power plant boiler according to claim 3 and the method for utilization step by step, it is characterized in that: this method also is connected in series the 3rd heat exchanger in the boiler exhaust gas flue, the 3rd heat exchanger is located at before the desulfurizing tower of boiler exhaust gas flue, after first heat exchanger, the 3rd heat exchanger heat provides flue gas heater to be used to improve flue-gas temperature behind desulfurizing tower, transmit heat by fluid media (medium) between flue gas heater and the 3rd heat exchanger, fluid media (medium) is water, or anti-icing fluid.
5. the recyclable smoke discharging residual heat quality of raising power plant boiler according to claim 1 and the method for utilization step by step, it is characterized in that: first heat exchanger is located at after the air preheater of boiler exhaust gas flue, before the deduster, perhaps first heat exchanger be located at after the deduster of boiler exhaust gas flue, before the air-introduced machine.
6. the recyclable smoke discharging residual heat quality of raising power plant boiler according to claim 1 and the method utilized step by step is characterized in that: described second heat exchanger is located at before the desulfurizing tower in the boiler exhaust gas flue, after the booster fan.
7. the recyclable smoke discharging residual heat quality of raising power plant boiler according to claim 1 and the method for utilization step by step, it is characterized in that: the heat transferring medium pipeline of described first heat exchanger is serially connected with in the boiler heat regenerative system by flow control valve, is used for the whole boiler feedwaters of heating.
8. the recyclable smoke discharging residual heat quality of raising power plant boiler according to claim 1 and the method for utilization step by step is characterized in that: the heat between described air heater and second heat exchanger transmits medium and carries out the adjusting of flow size by variable frequency pump or flow control valve.
9. the recyclable smoke discharging residual heat quality of raising power plant boiler according to claim 3 and the method utilized step by step is characterized in that: the heat transmission medium between described flue gas heater and first heat exchanger, between flue gas heater and second heat exchanger carries out the adjusting of flow size by variable frequency pump or flow control valve.
10. the recyclable smoke discharging residual heat quality of raising power plant boiler according to claim 4 and the method for utilization step by step is characterized in that: the heat between described flue gas heater and the 3rd heat exchanger transmits medium and carries out the adjusting of flow size by variable frequency pump or flow control valve.
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| CN102705810B (en) * | 2012-06-15 | 2014-09-17 | 黄绍新 | Device for boiler flue gas waste heat utilization in thermal power unit |
| CN102721037A (en) * | 2012-07-09 | 2012-10-10 | 福建成信绿集成有限公司 | Boiler flue gas waste heat recovery system and control method thereof |
| CN102767819B (en) * | 2012-07-13 | 2015-03-25 | 浙江工商大学 | Multi-stage biomass boiler flue gas and air heat recovery system and heat recovery method thereof |
| CN102759096B (en) * | 2012-07-24 | 2015-01-07 | 西安交通大学 | Smoke waste heat utilization system |
| CN104235826B (en) * | 2013-06-13 | 2017-02-08 | 烟台龙源电力技术股份有限公司 | Boiler flue gas waste heat recycling system |
| CN104006401B (en) * | 2013-11-04 | 2016-02-10 | 成信绿集成股份有限公司 | The degree of depth of boiler of power plant fume afterheat is recycled and emission-reducing system |
| CN103644564B (en) * | 2013-11-26 | 2016-01-13 | 中国华能集团清洁能源技术研究院有限公司 | A kind of two adjustable fluid flow wind transmission system of temperature resistance of CFBB |
| CN104534496A (en) * | 2014-12-30 | 2015-04-22 | 黑龙江国德节能服务有限公司 | Device for extracting boiler flue gas heat source by using stainless steel S-shaped fin type heat exchangers and heat exchange method |
| CN114278958A (en) * | 2021-12-28 | 2022-04-05 | 天津华赛尔传热设备有限公司 | Waste heat recovery system for steam injection boiler and steam injection boiler |
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