CN111120026A - Mechanical furnace deep coupling thermodynamic system of thermal power generating unit - Google Patents
Mechanical furnace deep coupling thermodynamic system of thermal power generating unit Download PDFInfo
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- CN111120026A CN111120026A CN201911335234.0A CN201911335234A CN111120026A CN 111120026 A CN111120026 A CN 111120026A CN 201911335234 A CN201911335234 A CN 201911335234A CN 111120026 A CN111120026 A CN 111120026A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K21/00—Steam engine plants not otherwise provided for
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Abstract
The invention discloses a mechanical furnace deep coupling thermodynamic system of a thermal power generating unit, which comprises a boiler, a main flue, a dust remover, an induced draft fan, a desulfurization device and a chimney which are sequentially communicated according to the gas circulation direction, wherein the main flue is connected with a bypass flue in parallel, the main flue is provided with an air preheater, the boiler is communicated with a primary air pipeline capable of exchanging heat with the air preheater, and the bypass flue is provided with a waste heat recovery system. The invention has the beneficial effects that: according to the scheme, cold air in the primary air pipeline is heated to a certain degree and then sent into the air preheater, the replaced high-grade high-temperature flue gas enters the bypass flue, the high-temperature flue gas which enters the bypass flue is shunted to heat water supply and condensed water, higher-grade regenerative steam extraction is extruded out and enters the steam turbine to do work, the cross and cascade utilization of energy is realized, and the power generation efficiency of the coal-fired power plant can be better improved compared with the prior art.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a mechanical furnace deep coupling thermodynamic system of a thermal power generating unit.
Background
The electric power is the most basic, cleanest and most convenient energy form in modern society, is important production data and living data of human beings, and plays an important supporting role in economic and social development. The Chinese energy resources are endowed with the characteristics of rich coal, lack of oil and little gas, and the Chinese power industry structure is mainly based on coal-fired power generation. Although the installed capacity of domestic non-fossil energy is rapidly increased in recent years under the influence of factors such as environmental protection, power supply structure reformation and the like, the proportion of the installed capacity of thermal power to the installed capacity of electric power is in a situation of slightly decreasing year by year, but the characteristic of the structure of the Chinese electric power industry mainly based on coal-fired power generation does not change fundamentally in a long period of time in the future. Therefore, the research on the high-efficiency clean power generation technology of coal is still an important scientific research direction at present.
For coal-fired power generating units, boiler flue gas loss is an important heat loss, and accounts for about 60% -70% of boiler heat loss. In recent years, with the improvement of main steam parameters and the wide application of an external steam cooler, the final feed water temperature of a thermal power generating unit is continuously improved, so that the exhaust smoke temperature of a boiler is increased, and the exhaust smoke loss is increased; meanwhile, in actual operation, the boiler exhaust gas temperature of the thermal power generating unit in China is higher than a design value, and the factors further increase the boiler exhaust gas loss. The direct abandonment of boiler exhaust heat brings very big energy waste and environmental pollution. The conventional method is that a flue gas waste heat exchanger is arranged in a flue at the tail part of a boiler, so that part of the waste heat of the discharged smoke of the boiler can be absorbed and used for heating condensed water and expelling low-pressure regenerative steam extraction, thereby reducing the smoke discharge loss of the boiler and improving the economy of a unit. At present, the flue gas waste heat utilization technology is gradually developed and matured in China and is widely applied.
However, because the exhaust gas temperature of the boiler is about 180 ℃, the energy-saving effect of the flue gas waste heat utilization technology is limited, and the energy-saving potential of the coal-fired power plant is yet to be further exploited. For a coal-fired power plant, high-temperature flue gas in an air preheater at the side of a boiler directly heats low-temperature air, and the heat exchange temperature difference at an air inlet end reaches about 160 ℃; on the steam turbine side, the high-temperature backheating steam extraction directly heats the low-temperature water supply, and the heat exchange temperature difference reaches about 250 ℃; according to the thermodynamic principle, the irreversible loss of heat exchange of a boiler flue gas air system and a turbine regenerative system is large, and if the conventional limit of a boiler and a turbine in a coal-fired power plant can be broken, the cascade utilization of energy is realized, and the power generation efficiency of the coal-fired power plant is further improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a mechanical furnace deep coupling thermodynamic system of a thermal power generating unit.
The invention is realized by the following technical scheme: the utility model provides a machine stove degree of depth coupling thermodynamic system of thermal power generating unit, includes boiler, flue, dust remover, draught fan, desulphurization unit and the chimney that communicates in proper order according to the gas flow direction, flue parallelly connected have the bypass flue, be provided with air heater on the flue, boiler intercommunication have the primary air pipeline that can carry out the heat exchange with air heater, the bypass flue on be provided with waste heat recovery system.
Furthermore, in order to better realize the invention, a hot water air heater capable of exchanging heat with a primary air pipeline is arranged between the air feeder and the steam fan heater, a flue gas waste heat recoverer is arranged between the main flue and the dust remover, the flue gas waste heat recoverer is circularly communicated with the hot water air heater through a pipeline, and a circulating pump and a regulating valve are arranged on the pipeline for communicating the flue gas waste heat recoverer with the hot water air heater.
Furthermore, in order to better realize the invention, a water supplementing tank is communicated with a pipeline communicated with the flue gas waste heat recoverer and the hot medium water air heater.
Furthermore, in order to better realize the invention, the primary air pipeline is communicated with a blower, and a steam fan heater capable of exchanging heat with the primary air pipeline is arranged between the blower and the air preheater.
Furthermore, in order to better realize the invention, the waste heat recovery system comprises a high-pressure smoke-water heat exchanger capable of exchanging heat with the bypass flue, the inlet of the high-pressure smoke-water heat exchanger is communicated with a feed water pump, and the outlet of the high-pressure smoke-water heat exchanger is communicated with the boiler.
Further, in order to better realize the invention, the high-pressure flue gas-water heat exchanger is connected with a steam turbine water supply system in parallel.
Furthermore, in order to better realize the invention, the waste heat recovery system comprises a low-pressure smoke and water heat exchanger capable of exchanging heat with the bypass flue, the low-pressure smoke and water heat exchanger is positioned on one side of the high-pressure smoke and water heat exchanger, which is far away from the boiler, the inlet of the low-pressure smoke and water heat exchanger is communicated with a steam turbine condensate system, and the outlet of the low-pressure smoke and water heat exchanger is communicated with a water feeding pump.
Further, in order to better realize the invention, the low-pressure smoke and water heat exchanger is connected with a No. six low-pressure heater in parallel.
Furthermore, in order to better realize the invention, a deaerator is arranged between the low-pressure smoke water heat exchanger and the water feeding pump.
Furthermore, in order to better realize the invention, a flue adjusting baffle plate positioned between the boiler and the waste heat recovery system is arranged on the bypass flue.
The beneficial effect that this scheme obtained is:
according to the scheme, cold air in the primary air pipeline is heated to a certain degree and then sent into the air preheater, the replaced high-grade high-temperature flue gas enters the bypass flue, the high-temperature flue gas which enters the bypass flue in a shunting manner can heat water supply and condensate water, higher-grade regenerative steam extraction is extruded out and enters the steam turbine to do work, cross and cascade utilization of energy is achieved, and the power generation efficiency of the coal-fired power plant can be better than that of the prior art.
Drawings
FIG. 1 is a schematic structural diagram of the present embodiment;
the system comprises an air preheater 1, a flue adjusting baffle 2, a high-pressure flue gas-water heat exchanger 3, a low-pressure flue gas-water heat exchanger 4, a steam fan heater 5, a hot medium water fan heater 6, a flue gas waste heat recoverer 7, a water supplementing tank 8, a circulating pump 9, a regulating valve 10, a main flue 11, a bypass flue 12, a steam turbine water supply system 13, a steam turbine condensate system 14, a water supply pump 15 and a low-pressure heater No. 16-VI.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1:
as shown in fig. 1, in this embodiment, a machine stove degree of depth coupling thermodynamic system of thermal power generating unit, include boiler, flue 11, dust remover, draught fan, desulphurization unit and the chimney that communicates in proper order according to the gas flow direction, flue 11 parallelly connected have bypass flue 12, be provided with air heater 1 on the flue 11, the boiler intercommunication have the primary air pipeline that can carry out the heat exchange with air heater 1, bypass flue 12 on be provided with waste heat recovery system.
The flue gas from the boiler is divided into two paths, one path is carried out in the main flue 11, and the other path enters the bypass flue 12. The primary air pipeline conveys air into the boiler, and the air preheater 1 is used for preheating the air in the primary air pipeline, so that the waste heat in the flue gas in the main flue 11 is utilized. The flue gas that gets into bypass flue 12 can be used for other heat exchanges, through the flow of flue gas in rational distribution flue 11 and bypass flue 12, can improve flue gas waste heat recovery and utilization ratio, reduces the waste of heat energy.
Example 2:
on the basis of the above embodiment, in this embodiment, a hot water air heater 6 capable of exchanging heat with a primary air pipeline is arranged between the blower and the steam air heater 5, a flue gas waste heat recoverer 7 is arranged between the main flue 11 and the dust remover, the flue gas waste heat recoverer 7 is circularly communicated with the hot water air heater 6 through a pipeline, and a circulating pump 9 and an adjusting valve 10 are arranged on the pipeline through which the flue gas waste heat recoverer 7 is communicated with the hot water air heater 6.
The hot medium water air heater 6 and the flue gas waste heat recoverer 7, the water supplementing tank 8, the circulating pump 9 and the regulating valve 10 jointly form flue gas waste heat recovery closed circulation, flue gas in the air preheater 1 enters the flue gas waste heat recoverer 7 after heat exchange is completed, hot medium water in the circulation absorbs flue gas waste heat entering the flue gas waste heat recoverer 7, all heat is used for heating primary air pressurized by the air feeder, the effect of flue gas waste heat recovery utilization is achieved, the flue gas waste heat recovery utilization rate is improved, and heat energy waste is reduced.
And a water supplementing tank 8 is communicated with a pipeline communicated with the heat medium water air heater 6 by the flue gas waste heat recoverer 7. The water replenishing tank is convenient for replenishing leaked and evaporated water.
In this embodiment, the primary air duct is communicated with a blower, and a steam fan heater 5 capable of exchanging heat with the primary air duct is arranged between the blower and the air preheater 1.
The air feeder is used for conveying air into the boiler through the primary air pipeline, and the steam fan heater 5 can further heat the air, so that the air in the primary air pipeline is heated in a gradient manner, and the heating efficiency is improved.
Example 3:
on the basis of the above embodiment, in this embodiment, the waste heat recovery system includes the high-pressure flue gas-water heat exchanger 3 capable of exchanging heat with the bypass flue 12, an inlet of the high-pressure flue gas-water heat exchanger 3 is communicated with the feed water pump 15, and an outlet of the high-pressure flue gas-water heat exchanger 3 is communicated with the boiler.
The water supply pump 15 supplies water to the high-pressure flue gas-water heat exchanger 3, the water exchanges heat with the flue gas in the high-pressure flue gas-water heat exchanger 3, and the water after heat exchange enters an economizer of the boiler, so that the heat of the flue gas in the bypass flue 12 is recycled.
In this embodiment, the high-pressure flue gas-water heat exchanger 3 is connected in parallel with a turbine water supply system 13.
The water outlet of the water supply pump 15 is divided into two paths, one path enters the high-pressure smoke-water heat exchanger 3 to exchange heat with smoke, the other path enters the steam turbine water supply system 13 to be heated by the steam turbine water supply system 13, and the two paths of heated water converge and enter the economizer of the boiler. Two paths of water supply are distributed through the water supply pump 15 according to actual conditions, the flue gas and the water can perform sufficient heat exchange by controlling the flow of the water, the utilization rate of the flue gas is improved, and the pressure of the steam turbine water supply system 13 is reduced.
In this embodiment, the waste heat recovery system include the low pressure cigarette water heat exchanger 4 that can carry out the heat exchange with bypass flue 12, low pressure cigarette water heat exchanger 4 is located the one side that boiler was kept away from to high pressure cigarette water heat exchanger 3, the entry intercommunication of low pressure cigarette water heat exchanger 4 has steam turbine condensate system 14, the export and the feed pump 15 intercommunication of low pressure cigarette water heat exchanger 4. The turbine condensed water system 14 is communicated with a condenser.
The residual heat of the flue gas subjected to heat exchange by the low-pressure flue gas-water heat exchanger 4 through the high-pressure flue gas-water heat exchanger 3 is subjected to heat exchange with the condensed water output by the steam turbine condensed water system 14, and the condensed water after heat exchange enters the water feeding pump 15.
In this embodiment, the low-pressure flue gas-water heat exchanger 4 is connected in parallel with a number six low-pressure heater 16.
The condensed water condensed by the turbine condensed water system 14 is mainly input to the number six low pressure heater 16. In the low-pressure smoke and water heat exchanger 4, the condensed water subjected to heat exchange is converged with the condensed water output by the No. six low-pressure heater 1 and then enters the water feeding pump 15. The low-pressure smoke-water heat exchanger 4 and the condensate water are utilized to exchange heat, and the waste heat of the smoke can be recycled in a gradient manner, so that the waste heat recycling rate of the smoke is improved.
In this embodiment, a deaerator is arranged between the low-pressure smoke-water heat exchanger 4 and the water feed pump 15. And removing oxygen in the condensed water by using a deaerator.
In this embodiment, the bypass flue 12 is provided with a flue adjusting baffle 2 located between the boiler and the waste heat recovery system. The flue adjusting baffle 2 is mainly used for adjusting the opening degree of the bypass flue 12, thereby adjusting the flue gas flow entering the bypass flue 12.
A bypass flue 12 is arranged on the side of a boiler of the boiler coupling thermodynamic system, cold air is heated to a certain degree by adopting low-grade steam turbine extraction and boiler flue gas waste heat and then is sent into an air preheater 1, high-grade high-temperature flue gas is replaced after entering the boiler, and the high-temperature flue gas enters the bypass flue 12.
The high-temperature flue gas which is shunted and enters the bypass flue 12 heats the feed water and the condensed water, and the higher grade backheating steam is extruded and enters the steam turbine to do work. The boiler-coupled thermodynamic system breaks through the traditional limit of a boiler island smoke-air system and a steam-water system of a steam turbine island, high-grade energy is replaced by low-grade energy, so that boiler-side energy and steam turbine-side energy are utilized in a cross mode according to energy levels, deep coupling of the boiler and the steam turbine is achieved, the power generation efficiency of a coal-fired power plant can be remarkably improved, and the system is simple and convenient to implement and apply.
In this embodiment, other undescribed contents are the same as those in the above embodiment, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The utility model provides a mechanical stove degree of depth coupling thermodynamic system of thermal power generating unit, includes boiler, flue (11), dust remover, draught fan, desulphurization unit and the chimney that communicates in proper order according to the gas flow direction, its characterized in that: the main flue (11) are connected in parallel with a bypass flue (12), the main flue (11) is provided with an air preheater (1), the boiler is communicated with a primary air pipeline capable of exchanging heat with the air preheater (1), and the bypass flue (12) is provided with a waste heat recovery system.
2. The mechanical furnace deep coupling thermodynamic system of a thermal power generating unit as claimed in claim 1, wherein: the hot air heating device is characterized in that a hot water air heater (6) capable of exchanging heat with a primary air pipeline is arranged between the air feeder and the steam air heater (5), a flue gas waste heat recoverer (7) is arranged between the main flue (11) and the dust remover, the flue gas waste heat recoverer (7) is communicated with the hot water air heater (6) in a circulating mode through a pipeline, and a circulating pump (9) and an adjusting valve (10) are arranged on the pipeline through which the flue gas waste heat recoverer (7) is communicated with the hot water air heater (6).
3. The mechanical furnace deep coupling thermodynamic system of a thermal power generating unit as claimed in claim 2, wherein: and a water supplementing tank (8) is communicated with a pipeline communicated with the flue gas waste heat recoverer (7) and the heat medium water air heater (6).
4. The mechanical furnace deep coupling thermodynamic system of a thermal power generating unit as claimed in claim 3, wherein: the primary air pipeline is communicated with an air feeder, and a steam fan heater (5) capable of exchanging heat with the primary air pipeline is arranged between the air feeder and the air preheater (1).
5. The mechanical furnace deep coupling thermodynamic system of a thermal power generating unit according to any one of claims 1, 2, 3 and 4, wherein: the waste heat recovery system comprises a high-pressure smoke-water heat exchanger (3) capable of exchanging heat with the bypass flue (12), the inlet of the high-pressure smoke-water heat exchanger (3) is communicated with a water feeding pump (15), and the outlet of the high-pressure smoke-water heat exchanger (3) is communicated with a boiler.
6. The mechanical furnace deep coupling thermodynamic system of a thermal power generating unit as claimed in claim 5, wherein: the high-pressure smoke-water heat exchanger (3) is connected with a steam turbine water supply system (13) in parallel.
7. The mechanical furnace deep coupling thermodynamic system of a thermal power generating unit as claimed in claim 5, wherein: the waste heat recovery system comprises a low-pressure smoke-water heat exchanger (4) capable of exchanging heat with a bypass flue (12), the low-pressure smoke-water heat exchanger (4) is located on one side, away from a boiler, of a high-pressure smoke-water heat exchanger (3), an inlet of the low-pressure smoke-water heat exchanger (4) is communicated with a steam turbine condensate system (14), and an outlet of the low-pressure smoke-water heat exchanger (4) is communicated with a water feeding pump (15).
8. The mechanical furnace deep coupling thermodynamic system of a thermal power generating unit as claimed in claim 7, wherein: the low-pressure smoke and water heat exchanger (4) is connected with a number six low-pressure heater (16) in parallel.
9. The mechanical furnace deep coupling thermodynamic system of a thermal power generating unit as claimed in claim 7, wherein: and a deaerator is arranged between the low-pressure smoke water heat exchanger (4) and the water feeding pump (15).
10. The mechanical furnace deep coupling thermodynamic system of a thermal power generating unit according to any one of claims 1, 2, 3, 4, 6, 7, 8 and 9, wherein: and a flue adjusting baffle (2) positioned between the boiler and the waste heat recovery system is arranged on the bypass flue (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911335234.0A CN111120026A (en) | 2019-12-23 | 2019-12-23 | Mechanical furnace deep coupling thermodynamic system of thermal power generating unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911335234.0A CN111120026A (en) | 2019-12-23 | 2019-12-23 | Mechanical furnace deep coupling thermodynamic system of thermal power generating unit |
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| CN111120026A true CN111120026A (en) | 2020-05-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879938A (en) * | 2021-01-26 | 2021-06-01 | 东方电气集团东方汽轮机有限公司 | Machine-furnace coupled waste heat deep utilization system of bituminous coal unit |
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| CN206320726U (en) * | 2016-12-16 | 2017-07-11 | 东方电气集团东方锅炉股份有限公司 | A kind of thermal power plant's tail flue gas afterheat utilizing system coupled based on machine stove depth |
| WO2018009247A1 (en) * | 2016-07-08 | 2018-01-11 | Arvos Ljungstrom Llc | Method and system for improving boiler effectiveness |
| CN110553245A (en) * | 2018-06-01 | 2019-12-10 | 中国电力工程顾问集团华北电力设计院有限公司 | System for improving wide-load operation thermal efficiency of coal-fired unit |
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2019
- 2019-12-23 CN CN201911335234.0A patent/CN111120026A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018009247A1 (en) * | 2016-07-08 | 2018-01-11 | Arvos Ljungstrom Llc | Method and system for improving boiler effectiveness |
| CN206320726U (en) * | 2016-12-16 | 2017-07-11 | 东方电气集团东方锅炉股份有限公司 | A kind of thermal power plant's tail flue gas afterheat utilizing system coupled based on machine stove depth |
| CN110553245A (en) * | 2018-06-01 | 2019-12-10 | 中国电力工程顾问集团华北电力设计院有限公司 | System for improving wide-load operation thermal efficiency of coal-fired unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112879938A (en) * | 2021-01-26 | 2021-06-01 | 东方电气集团东方汽轮机有限公司 | Machine-furnace coupled waste heat deep utilization system of bituminous coal unit |
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Application publication date: 20200508 |