CN105157011A - Device and method for reducing backpressure of steam turbine by using waste heat of exhaust smoke of boiler - Google Patents
Device and method for reducing backpressure of steam turbine by using waste heat of exhaust smoke of boiler Download PDFInfo
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- CN105157011A CN105157011A CN201510609807.XA CN201510609807A CN105157011A CN 105157011 A CN105157011 A CN 105157011A CN 201510609807 A CN201510609807 A CN 201510609807A CN 105157011 A CN105157011 A CN 105157011A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
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Abstract
The invention discloses a device and a method for reducing backpressure of a steam turbine by using waste heat of exhaust smoke of a boiler. According to the device and the method, fuel coal is combusted in a hearth of the boiler; hot smoke flows along a horizontal smoke channel and a tail smoke channel of the boiler; the hot smoke passing through the tail smoke channel is introduced into an air pre-heater and is heated by the hot smoke; then the hot smoke is introduced into a dust remover after being introduced into an absorption-type refrigerating machine for cooling; the combusted coal ash is separated; the smoke is introduced into a desulfuration tower for desulfurizing and is subsequently discharged into the atmosphere through the chimney; the boiler water supply from a condenser is heated by the regenerative extraction steam of the steam turbine in a water supply heater, is introduced into the boiler, absorbs the heat in the boiler and becomes overheated steam; the overheated steam is introduced into the steam turbine through the horizontal smoke channel and is used for pushing a rotor of the steam turbine to rotate and apply work; the steam after applying work is discharged through a steam outlet in the lower part of the steam turbine, is cooled by the cooled water which is cooled by the absorption-type refrigerating machine and is re-condensed into water; and one cycle is completed. Through the device and the method, the backpressure of the steam turbine is reduced, and the power generation efficiency of power plants is improved.
Description
Technical field
The invention belongs to coal fired power plant energy conservation field, particularly relate to a kind of device and method utilizing boiler exhaust gas waste heat to reduce turbine back pressure.
Background technology
In the primary energy that China has been verified, coal occupies the ratio of nearly 90%, and according to recent statistics, coal electricity total installation of generating capacity has reached about 900,000,000 kilowatts.The electric national economic development for China of coal and people's lives provide important electric power safeguard, but, the flue dust, the SO that are produced by coal electricity
2, NO
x, heavy metal contaminants and a large amount of carbon dioxide greenhouse gas such as mercury, bring serious environmental problem.For coordinating the contradiction of environment and electric power development, promote the high efficiency of coal electrical travelling industry, development energy-conserving and emission-cutting technology, has become the development strategy that China is long-term.
Station boiler is as the first energy consumption equipment of China, and annual consumption about 1,500,000,000 tons mark coals, account for nearly 50% of national coal consumption total amount.At present, the thermal efficiency of large-sized station boiler is generally at about 90-94%, and wherein heat loss due to exhaust gas accounts for the over half of whole heat loss, contains huge residual heat resources.If carry out deep exploitation to residual heat from boiler fume, fired power generating unit will save a large amount of coal consumption, thus the discharge of decreasing pollution thing, China's energy-saving and emission-reduction strategy is significant.
In addition, turbine back pressure is the important factor in order of coal unit generating efficiency and coa consumption rate, and research shows, turbine back pressure often reduces 0.1kPa, and coal consumption will reduce 0.09g/kWh.If reduction turbine back pressure, also material impact will be produced to coal fired power plant generating efficiency and coal consumption.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of device and method utilizing boiler exhaust gas waste heat to reduce turbine back pressure, reducing turbine back pressure, improving power plants generating electricity efficiency.
In order to achieve the above object, the technical scheme that the present invention takes is:
A kind of device utilizing boiler exhaust gas waste heat to reduce turbine back pressure, comprise boiler 1, the back-end ductwork of boiler 1 is connected with air preheater 5, the exhanst gas outlet of air preheater 5 is connected with the smoke inlet of Absorption Refrigerator 6, the exhanst gas outlet of Absorption Refrigerator 6 is connected with the entrance of deduster 7, the outlet of deduster 7 is connected by the entrance of air-introduced machine 8 with desulfurizing tower 9, and the outlet of desulfurizing tower 9 is communicated by chimney 10 and air, the delivery port of the steam turbine 2 that the feed-water intake of boiler 1 is connected with two or more by the feed-water heater 4 that two or more is connected is connected, the steam (vapor) outlet of the horizontal flue of boiler 1 is connected with the air inlet of steam turbine 2, afterbody steam turbine 2 is connected with generator G, the exhaust steam outlet of afterbody steam turbine 2 is connected with feed-water heater 4 water inlet of afterbody by condenser 3, the cooling water inlet of condenser 3 is connected with the cold water product exit of Absorption Refrigerator 6, the hydrophobic outlet of upper level and the hydrophobic entrance of next stage of feed-water heater 4 are interconnected, the regenerative steam entrance of feed-water heater 4 is connected with the regenerative steam outlet of steam turbine 2.
Described Absorption Refrigerator 6 comprises generator 6-1, the concentrated solution outlet of generator 6-1 is connected with absorber 6-4 concentrated solution entrance, the weak solution entrance of generator 6-1 is connected with the weak solution outlet of absorber 6-4 by circulating pump 6-6, the refrigerant outlet of generator 6-1 is connected with the refrigerant inlet of condenser 6-2, the refrigerant outlet of condenser 6-2 is connected with the refrigerant inlet of evaporimeter 6-3 by choke valve 6-5, the refrigerant outlet of evaporimeter 6-3 is connected with the refrigerant inlet of absorber 6-4, generator 6-1 is heated by driving heat source, condenser 6-2, absorber 6-4 is respectively by water quench, the cold water product exit of evaporimeter 6-3 is connected with the cooling water inlet of condenser 3.
A kind of described method utilizing boiler exhaust gas waste heat to reduce turbine back pressure, comprises the following steps:
The coal-fired burner hearth combustion at boiler 1, the heat smoke formed after burning is along the horizontal flue of boiler and back-end ductwork flowing, air preheater 5 is entered by the heat smoke of back-end ductwork, combustion-supporting air is sent in air preheater 5 and is heated by heat smoke, Absorption Refrigerator 6 is entered from the heat smoke of air preheater 5, produce cold to entering deduster 7 after cooling water temperature, coal ash after burning is separated, from deduster 7 flue gas out after air-introduced machine 8, enter desulfurizing tower 9 and carry out desulfurization, under the effect of air-introduced machine 8, air is entered by chimney 10 from the flue gas of desulfurizing tower 9 cleaning out,
From the boiler feedwater of condenser 3, by after the heating of the regenerative steam of steam turbine 2 in feed-water heater 4, enter boiler 1, become superheated steam after absorbing heat wherein, introduce after steam turbine 2 through horizontal flue, the rotor turns acting of pushing turbine 2, steam after acting is discharged from the steam drain of steam turbine 2 bottom, in condenser 3 by the water quench after lowering the temperature through Absorption Refrigerator 6, regelation Cheng Shui, completes a circulation.
Beneficial effect of the present invention is:
1, the exhaust gas temperature after air preheater 5 is usually at 120-150 degree, and the entrance optimum temperature of deduster 7 is 90 degree, and condenser 3 of the present invention effectively can reclaim this part fume afterheat, effectively promotes boiler efficiency and dust collector efficiency.
2, reduce turbine back pressure, improve steam turbine and go out merit and unit generation efficiency, thus reduce gross coal consumption rate.
3, be widely used in water chiller and Air-cooled Unit, there are the potentiality reducing air cooler power consumption, replace cooling tower.
4, Absorption Refrigerator is widely used in ammonia absorption type refrigeration popular at present and lithium bromide absorbing type refrigeration mode.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural representation.
Fig. 2 is Absorption Refrigerator schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail.
With reference to Fig. 1, a kind of device utilizing boiler exhaust gas waste heat to reduce turbine back pressure, comprise boiler 1, the back-end ductwork of boiler 1 is connected with air preheater 5, the exhanst gas outlet of air preheater 5 is connected with the smoke inlet of Absorption Refrigerator 6, the exhanst gas outlet of Absorption Refrigerator 6 is connected with the entrance of deduster 7, and the outlet of deduster 7 is connected by the entrance of air-introduced machine 8 with desulfurizing tower 9, and the outlet of desulfurizing tower 9 is communicated by chimney 10 and air, the delivery port of the steam turbine 2 that the feed-water intake of boiler 1 is connected with two or more by the feed-water heater 4 that two or more is connected is connected, the steam (vapor) outlet of the horizontal flue of boiler 1 is connected with the air inlet of steam turbine 2, afterbody steam turbine 2 is connected with generator G, the exhaust steam outlet of afterbody steam turbine 2 is connected with feed-water heater 4 water inlet of afterbody by condenser 3, the cooling water inlet of condenser 3 is connected with the cold water product exit of Absorption Refrigerator 6, the hydrophobic outlet of upper level and the hydrophobic entrance of next stage of feed-water heater 4 are interconnected, the regenerative steam entrance of feed-water heater 4 is connected with the regenerative steam outlet of steam turbine 2.
With reference to Fig. 2, described Absorption Refrigerator 6 comprises generator 6-1, the concentrated solution outlet of generator 6-1 is connected with absorber 6-4 concentrated solution entrance, the weak solution entrance of generator 6-1 is connected with the weak solution outlet of absorber 6-4 by circulating pump 6-6, the refrigerant outlet of generator 6-1 is connected with the refrigerant inlet of condenser 6-2, the refrigerant outlet of condenser 6-2 is connected with the refrigerant inlet of evaporimeter 6-3 by choke valve 6-5, the refrigerant outlet of evaporimeter 6-3 is connected with the refrigerant inlet of absorber 6-4, generator 6-1 is heated by driving heat source, condenser 6-2, absorber 6-4 is respectively by water quench, the cold water product exit of evaporimeter 6-3 is connected with the cooling water inlet of condenser 3.
The operation principle of Absorption Refrigerator 6 is: the working media of Absorption Refrigerator 6 is ammonia refrigerant and absorbent cooling water, the two composition working medium pair, utilize driving heat source in generator 6-1, heat the ammoniacal liquor weak solution transported from absorber 6-4 by solution pump 6-6, and the most of low boiling point refrigerant ammonia in ammoniacal liquor is evaporated; Cold-producing medium ammonia steam enters in condenser 6-2, and cooled water-cooled is congealed into cold-producing medium ammoniacal liquor again, then is depressured to evaporating pressure through choke valve 6-5; Cold-producing medium ammoniacal liquor enters in evaporimeter 6-3 through throttling, absorbs the heat in cooled system and is excited into the cold-producing medium ammonia steam under evaporating pressure; In generator 6-1, drop to evaporating pressure through the remaining liquor ammoniae fortis of generating process through choke valve 6-5 enters in absorber 6-4, mix with from evaporimeter 6-3 low pressure refrigerant ammonia vapor phase out, and absorb low pressure refrigerant ammonia steam and return to original concentration; Absorption process is an exothermic process, therefore cools ammonia spirit with cooling water in absorber 6-4, and the ammonia solution having recovered concentration in absorber 6-4 sends into continuation circulation in generator 6-1 again after solution pump 6-6 boosting.
A kind of described method utilizing boiler exhaust gas waste heat to reduce turbine back pressure, comprises the following steps:
The coal-fired burner hearth combustion at boiler 1, the heat smoke formed after burning is along the horizontal flue of boiler and back-end ductwork flowing, air preheater 5 is entered by the heat smoke of back-end ductwork, combustion-supporting air is sent in air preheater 5 and is heated by heat smoke, Absorption Refrigerator 6 is entered from the heat smoke of air preheater 5, produce cold to entering deduster 7 after cooling water temperature, coal ash after burning is separated, from deduster 7 flue gas out after air-introduced machine 8, enter desulfurizing tower 9 and carry out desulfurization, under the effect of air-introduced machine 8, air is entered by chimney 10 from the flue gas of desulfurizing tower 9 cleaning out,
From the boiler feedwater of condenser 3, by after the heating of the regenerative steam of steam turbine 2 in feed-water heater 4, enter boiler 1, become superheated steam after absorbing heat wherein, introduce after steam turbine 2 through horizontal flue, the rotor turns acting of pushing turbine 2, steam after acting is discharged from the steam drain of steam turbine 2 bottom, in condenser 3 by the water quench after lowering the temperature through Absorption Refrigerator 6, regelation Cheng Shui, completes a circulation.
Claims (3)
1. the device utilizing boiler exhaust gas waste heat to reduce turbine back pressure, comprise boiler (1), it is characterized in that: the back-end ductwork of boiler (1) is connected with air preheater (5), the exhanst gas outlet of air preheater (5) is connected with the smoke inlet of Absorption Refrigerator (6), the exhanst gas outlet of Absorption Refrigerator (6) is connected with the entrance of deduster (7), the outlet of deduster (7) is connected by the entrance of air-introduced machine (8) with desulfurizing tower (9), the outlet of desulfurizing tower (9) is communicated by chimney (10) and air, the delivery port of the steam turbine (2) that the feed-water heater (4) that the feed-water intake of boiler (1) is connected by two or more is connected with two or more is connected, the steam (vapor) outlet of the horizontal flue of boiler (1) is connected with the air inlet of steam turbine (2), afterbody steam turbine (2) is connected with generator (G), the exhaust steam outlet of afterbody steam turbine (2) is connected with feed-water heater (4) water inlet of afterbody by condenser (3), the cooling water inlet of condenser (3) is connected with the cold water product exit of Absorption Refrigerator (6), the hydrophobic outlet of upper level and the hydrophobic entrance of next stage of feed-water heater (4) are interconnected, the regenerative steam entrance of feed-water heater (4) is connected with the regenerative steam outlet of steam turbine (2).
2. a kind of device utilizing boiler exhaust gas waste heat to reduce turbine back pressure according to claim 1, it is characterized in that: described Absorption Refrigerator (6) comprises generator (6-1), the concentrated solution outlet of generator (6-1) is connected with absorber (6-4) concentrated solution entrance, the weak solution entrance of generator (6-1) is connected with the weak solution outlet of absorber (6-4) by circulating pump (6-6), the refrigerant outlet of generator (6-1) is connected with the refrigerant inlet of condenser (6-2), the refrigerant outlet of condenser (6-2) is connected with the refrigerant inlet of evaporimeter (6-3) by choke valve (6-5), the refrigerant outlet of evaporimeter (6-3) is connected with the refrigerant inlet of absorber (6-4), generator (6-1) is heated by driving heat source, condenser (6-2), absorber (6-4) is respectively by water quench, the cold water product exit of evaporimeter (6-3) is connected with the cooling water inlet of condenser (3).
3. utilize boiler exhaust gas waste heat to reduce a method for turbine back pressure, it is characterized in that: comprise the following steps:
The coal-fired burner hearth combustion at boiler (1), the heat smoke formed after burning is along the horizontal flue of boiler and back-end ductwork flowing, air preheater (5) is entered by the heat smoke of back-end ductwork, combustion-supporting air is sent in air preheater (5) and is heated by heat smoke, the heat smoke come from air preheater (5) enters Absorption Refrigerator (6), produce cold to entering deduster (7) after cooling water temperature, coal ash after burning is separated, from deduster (7) flue gas out after air-introduced machine (8), enter desulfurizing tower (9) and carry out desulfurization, under the effect of air-introduced machine (8), air is entered by chimney (10) from the flue gas of desulfurizing tower (9) cleaning out,
From the boiler feedwater that condenser (3) comes, by after the heating of the regenerative steam of steam turbine (2) in feed-water heater (4), enter boiler (1), superheated steam is become after absorbing heat wherein, introduce after steam turbine (2) through horizontal flue, the rotor turns acting of pushing turbine (2), steam after acting is discharged from the steam drain of steam turbine (2) bottom, in condenser (3) by through Absorption Refrigerator (6) cooling after water quench, regelation Cheng Shui, completes a circulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510609807.XA CN105157011A (en) | 2015-09-22 | 2015-09-22 | Device and method for reducing backpressure of steam turbine by using waste heat of exhaust smoke of boiler |
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| CN201510609807.XA CN105157011A (en) | 2015-09-22 | 2015-09-22 | Device and method for reducing backpressure of steam turbine by using waste heat of exhaust smoke of boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322355A (en) * | 2021-10-21 | 2022-04-12 | 西安热工研究院有限公司 | Flue gas water taking system of cooperative absorption type refrigerating device and operation method |
| CN114623460A (en) * | 2022-03-28 | 2022-06-14 | 山东大学 | System for drying biomass by using flue gas waste heat |
| CN114838518A (en) * | 2022-05-31 | 2022-08-02 | 华能营口热电有限责任公司 | Desulfurization slurry flash evaporation refrigeration system and method for reducing backpressure of steam turbine |
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| CN104913295A (en) * | 2015-06-09 | 2015-09-16 | 浙江大学宁波理工学院 | Thermal power plant flue gas purification and surplus-energy utilization device and device utilization method |
| CN205026643U (en) * | 2015-09-22 | 2016-02-10 | 中国华能集团清洁能源技术研究院有限公司 | Utilize boiler to discharge fume waste heat and reduce device of steam turbine backpressure |
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Patent Citations (6)
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| JPH07324725A (en) * | 1994-06-01 | 1995-12-12 | Sumitomo Heavy Ind Ltd | Thermal recoverying device in clinker processing facility |
| CN102828790A (en) * | 2011-06-14 | 2012-12-19 | 同方节能工程技术有限公司 | Low-pressure heating system for power plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322355A (en) * | 2021-10-21 | 2022-04-12 | 西安热工研究院有限公司 | Flue gas water taking system of cooperative absorption type refrigerating device and operation method |
| CN114623460A (en) * | 2022-03-28 | 2022-06-14 | 山东大学 | System for drying biomass by using flue gas waste heat |
| CN114838518A (en) * | 2022-05-31 | 2022-08-02 | 华能营口热电有限责任公司 | Desulfurization slurry flash evaporation refrigeration system and method for reducing backpressure of steam turbine |
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