CN102828790A - Low-pressure heating system for power plant - Google Patents
Low-pressure heating system for power plant Download PDFInfo
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- CN102828790A CN102828790A CN201110159422XA CN201110159422A CN102828790A CN 102828790 A CN102828790 A CN 102828790A CN 201110159422X A CN201110159422X A CN 201110159422XA CN 201110159422 A CN201110159422 A CN 201110159422A CN 102828790 A CN102828790 A CN 102828790A
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Abstract
The invention discloses a low-pressure heating system for the power plants, and relates to a low-pressure heating system used for recovering heat and heating in power plants. The system comprises a waste-heat recovering type low-pressure heater, a turbine, steam condenser, a cooling tower connected with the steam condenser, a primary condensed water pump, a de-aerator connected with the turbine, and a steam condenser cooling circulating water pump. The waste-heat recovering type low-pressure heater comprises a generator, a condenser, an evaporator, an absorber, a solution heat exchanger, a shielding pump and a throttle valve. The primary condensed water pump is connected with the heat-exchanging pipe bundle in the absorber and the heat-exchanging pipe bundle in the condenser by the low-pressure heater condensed-water intake pipeline; the heat-exchanging pipe bundle in the condenser is connected with the de-aerator by the de-aerator condensed-water intake pipeline; the heat-exchanging pipe bundle in the generator is connected with the turbine by the turbine steam pumping pipeline; the heat-exchanging pipe bundle in the evaporator is connected with the condenser cooling circulating water outlet pipeline and the condenser cooling circulating water inlet pipeline. The low-pressure heating system provided by the invention can effectively recover a large amount of low-temperature waste heat contained in the waste steam exhausted by the turbine, thereby significantly enhancing the heat efficiency of the power plants.
Description
Technical field
The present invention relates to be used for a kind of low pressure heating system of power plant's backheat heating.
Background technique
The backheat heating of power plant is the important measures that improve the thermal efficiency, reduce boiler load, fuel saving.
In the existing technology, in the back heating system of power plant, low-pressure heater is the equipment that comes heat-setting water with the low-pressure pumping steam of steam turbine between vapour condenser and oxygen-eliminating device.Low-pressure heater is a surface heater; Connect before and after being generally 2 to 5 grades of low-pressure heaters; The extracted steam from turbine that utilizes different pressures is heat-setting water step by step; To near the saturation water temperature under this vapor pressure, then water of condensation is sent into oxygen-eliminating device, also is that contact(-type) heater carries out deoxygenation, as shown in Figure 1.The vapour condenser role comprises: 1) set up and keep high vacuum state at the turbine discharge mouth, so that steam expand into minimum pressure in steam turbine, increase the steam usable enthalpy drop, improve thermal efficiency of cycle; 2) exhaust steam that steam turbine is arranged is condensed into water, circulate to send boiler again back to; 3) compile all kinds of hydrophobicly, reduce loss of steam and water.But simultaneously, the circulating water of cooling vapour condenser is taken away great amount of heat energy, always imports the over half of heat thereby cause the heat of condensation loss perhaps to make cold source energy, this part loss account for power generation process.
Nonelectrical energy or mechanical energy drive absorption heat pump by heat energy, can low grade residual heat be promoted to more HQ high grade and recycle.Is example to adopt lithium-bromide solution as the right single-action first kind absorption heat pump of working medium; It is by the low-pressure saturated steam driving generator of high temperature driven thermal source like 0.1～1MPa; By the low temperature exhaust heat water-driven vaporizer of low temperature exhaust heat thermal source as 20～60 ℃, hot water backwater's adsorber, condenser intensification of successively absorbing heat of flowing through, make higher temperature as 60～100 ℃ hot water; Its coefficient of performance about 1.8; That is to say that the low pressure steam of 1 part of heat is the low temperature exhaust heat of recyclable 0.8 part of heat, finally make the hot water of the higher temperature of 1.8 parts of heats.When the quality of driving heat source higher; Such as the pressure and temperature of saturated vapour when higher; High pressure, low pressure two speciogenesis devices can also be set simultaneously, and the steam that produces in the high-pressure generator can further be used for improving the concentration of solution in the low pressure generator, i.e. economic benefits and social benefits first kind absorption heat pump.The coefficient of performance of the first kind absorption heat pump of economic benefits and social benefits or multiple-effect type is higher, can reclaim than the more low temperature exhaust heat of single-action first kind absorption heat pump during also promptly with the steam driven of same heat.
Therefore, a large amount of low grade residual heats that contained in the cooling circulating water to plant condenser can adopt absorption heat pump to reclaim.But; The existing all kinds of technological scheme of utilizing absorption heat pump to reclaim the electric power plant circulating water low temperature exhaust heat is primarily aimed at the application direction of central heating; And central heating receives the restriction of latitude, heating cycle length; The most of the time heat-pump apparatus all is in idle state in 1 year, thereby has caused waste.
Summary of the invention
To the problem that exists in the above-mentioned existing technology, the invention provides a kind of power plant low pressure heating system, it can effectively reclaim the contained a large amount of low temperature exhaust heats of exhaust steam that steam turbine is arranged, thereby the thermal efficiency of power plant is significantly improved.
Realize as follows in order to reach foregoing invention purpose technological scheme of the present invention:
A kind of power plant low pressure heating system, it comprises residual heat recovery type low-pressure heater, steam turbine, vapour condenser, the cooling tower that is connected with vapour condenser, main condensate pump, the oxygen-eliminating device that is connected with steam turbine, vapour condenser cool cycles water pump.Said residual heat recovery type low-pressure heater comprises generator, condenser, vaporizer, adsorber, solution heat exchanger, canned motorpump and throttle valve.Vapour condenser links to each other with the steam-expelling port of steam turbine; The main condensate pump is positioned at the water of condensation of condenser condensed water outlet and advances on the low-pressure heater pipeline, and vapour condenser cool cycles water pump is positioned on vapour condenser cooling circulating water outlet conduit or the vapour condenser cooling circulating water inlet pipeline.Generator links to each other with adsorber through solution heat exchanger, and the connecting tube that comes out from adsorber oppositely passes solution heat exchanger and is connected to generator behind canned motorpump, and vaporizer passes through throttle valve, condenser links to each other with generator.Its structural feature is; Said main condensate pump advances in low-pressure heater pipeline and the adsorber through water of condensation that heat exchanger pipe bundle links to each other in the heat exchanger pipe bundle and condenser; The interior heat exchanger pipe bundle of condenser advances the oxygen-eliminating device pipeline through water of condensation and links to each other with oxygen-eliminating device; Heat exchanger pipe bundle links to each other with steam turbine through the extracted steam from turbine pipeline in the generator, and heat exchanger pipe bundle links to each other with vapour condenser cooling circulating water inlet pipeline with vapour condenser cooling circulating water outlet conduit respectively in the vaporizer.
In above-mentioned low pressure heating system, said extracted steam from turbine pipeline is provided with modulating valve.
In above-mentioned low pressure heating system, the connecting tube of heat exchanger pipe bundle and vapour condenser cooling circulating water outlet conduit is provided with modulating valve in the said vaporizer.
In above-mentioned low pressure heating system, the connecting tube of heat exchanger pipe bundle and vapour condenser cooling circulating water inlet pipeline is provided with modulating valve in the said vaporizer.
In above-mentioned low pressure heating system, said residual heat recovery type low-pressure heater can be single-effect type, dual effect type or multiple-effect type.
The present invention is owing to adopted said structure; Adopting absorption heat pump is the residual heat recovery type low-pressure heater, can know that according to the character of absorption heat pump the contained a large amount of low temperature exhaust heats of the cooling circulating water of vapour condenser can effectively reclaim; Thereby with respect to existing power plant back heating system; The present invention significantly reduced since low-pressure heater required extract the amount of steam from steam turbine, saved more steam can do work generating or externally heat supply, make the thermal efficiency of power plant be able to effective raising.Present device can be moved throughout the year, and Economy is much better than the existing absorption heat pump that utilizes to central heating and reclaims the technological scheme of electric power plant circulating water low temperature exhaust heat.
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Description of drawings
Fig. 1 is the low pressure heating system schematic representation of existing technology power plant backheat.
Fig. 2 is a power plant of the present invention low pressure heating system schematic representation.
Embodiment
Referring to Fig. 2, the present invention includes the residual heat recovery type low-pressure heater, steam turbine 1, vapour condenser 2, the cooling tower 6 that is connected with vapour condenser 2, main condensate pump 3, the oxygen-eliminating device 5 that is connected with steam turbine 1, the vapour condenser cool cycles water pump 7 that adopt single-effect type, dual effect type or multiple-effect type.The residual heat recovery type low-pressure heater comprises generator 81, condenser 82, vaporizer 83, adsorber 84, solution heat exchanger 85, canned motorpump 86 and throttle valve 87.Vapour condenser 2 links to each other with the steam-expelling port of steam turbine 1; Main condensate pump 3 is positioned at the water of condensation of vapour condenser 2 water of condensation outlet and advances on the low-pressure heater pipeline 11, and vapour condenser cool cycles water pump 7 is positioned on vapour condenser cooling circulating water outlet conduit 9 or the vapour condenser cooling circulating water inlet pipeline 10.Generator 81 links to each other with adsorber 84 through solution heat exchanger 85, and the connecting tube that comes out from adsorber 84 oppositely passes solution heat exchanger 85 and is connected to generator 81 behind canned motorpump 86, and vaporizer 83 passes through throttle valve 87, condenser 82 links to each other with generator 81.Main condensate pump 3 advances low-pressure heater pipeline 11 through water of condensation and links to each other with condenser 82 interior heat exchanger pipe bundles with adsorber 84 interior heat exchanger pipe bundles; Condenser 82 interior heat exchanger pipe bundles advance oxygen-eliminating device pipeline 12 through water of condensation and link to each other with oxygen-eliminating device 5; Heat exchanger pipe bundle links to each other with steam turbine 1 through the extracted steam from turbine pipeline 13 that is provided with modulating valve in the generator 81; Heat exchanger pipe bundles link to each other with vapour condenser cooling circulating water inlet pipeline 10 with vapour condenser cooling circulating water outlet conduit 9 respectively in the vaporizer 83, and heat exchanger pipe bundle is provided with modulating valve respectively with on vapour condenser cooling circulating water outlet conduit 9 and the pipeline that vapour condenser cooling circulating water inlet pipeline 10 is connected.
When the present invention moved, the residual heat recovery type low-pressure heater heated the water of condensation of coming out from vapour condenser 2, and its high temperature driven thermal source is that steam turbine 1 draws gas also is low pressure steam, and its low temperature exhaust heat thermal source is vapour condenser 2 cooling circulating waters.
Absorbent solutions such as lithium-bromide solution are heated and desorb goes out water vapour in the generator 81, and solution concentration increases, and behind solution heat exchanger 85, sends into adsorber 84; Absorbent solution such as lithium-bromide solution concentration are higher in the adsorber 84; Receive hot water backwater's in the heat exchanger pipe bundle cooling to absorb water vapour afterwards; Solution concentration reduces; Through canned motorpump 86 adherence pressures, and after the higher solution heat exchange of the temperature that solution heat exchanger 85 and generator 81 are sent here, promote temperature, send into generator 81 then; More than constituted the circulation of absorbent solution.
Absorbent solutions such as lithium-bromide solution are heated and desorb goes out working medium water vapour in the generator 81, and the working-medium water steam is sent into condenser 82 through connecting pipe, and receive hot water backwater's in the heat exchanger pipe bundle cooling and discharge the latent heat of condensation and condense into working-medium water; Working-medium water is sent into vaporizer 83 after throttle valve 87 reduces pressure, and receives the heating of waste heat in vaporizer 83 heat exchanger pipe bundles and absorb the latent heat of vaporization and become the working-medium water steam, and the working-medium water steam gets into adsorber through connecting pipeline; Adsorber 84 is different with the solution concentration that generator 81 is carried mutually, is equivalent to a part of working-medium water and has got back to generator 81 from adsorber 84; More than constituted the circulation of working-medium water.
The low pressure steam of being extracted out by steam turbine 1 (being generally the saturated vapour of 0.1～1MPa) drives generator 81 as high temperature heat source, hydrophobic oxygen-eliminating device 5 or the vapour condenser 2 delivered to that condenses after the low pressure steam heat release and produce; Circulating water (being generally 15～40 ℃) by cooling vapour condenser 2 drives vaporizer 83 as low-temperature heat source; Because vaporizer 83 internal pressures are very low; Working-medium water has absorbed the contained low temperature exhaust heat of circulating water simultaneously just vaporizing under the low temperature very much, sends vapour condenser 2 back to after the circulating water heat release cooling; The working substance steam that parses in the generator 81 is sent in the condenser 82; Condensation also discharges the latent heat of condensation; Working-medium waters are vaporizated into steam and send into adsorber 84 in the vaporizer 83, and by absorbing agent such as lithium bromide are absorbed, and it is hot to discharge absorption; The water of condensation that main condensate pump 3 is carried is successively connected through heat exchanger pipe bundle and is absorbed heat and be warming up to 60～100 ℃ through adsorber 84 and condenser 82, sends into oxygen-eliminating device 5 at last.
Owing to all be provided with modulating valve on steam turbine 1 extraction line 13, vapour condenser cooling circulating water outlet conduit 9, the vapour condenser cooling circulating water inlet pipeline 10; Like this can be according to turbine back pressure situation and ambient temperature, vapour condenser cooling temperature of circulating water, the amount of suitably regulating vapour condenser cooling circulating water and extracted steam from turbine.For example, under the cold conditions, circulating water temperature itself is just very low in the winter time; Utilizable waste heat amount is fewer; Therefore can suitably reduce the amount of circulating water, the amount of required extracted steam from turbine also reduces thereupon, freezes to prevent cooling tower 6 and pipeline thereof; This moment, the circulating ratio of circulating water descended, and the power consumption of vapour condenser cool cycles water pump also reduces; Under the summer high temperature condition, circulating water temperature is higher, can supply recovery waste heat more, can improve circulating water flow, and the amount of required extracted steam from turbine also increases thereupon, to reclaim more low temperature exhaust heats, improves generating efficiency.
The advantage of present technique scheme is following:
1) effectively reclaimed a large amount of low temperature exhaust heats that cooling circulating water contained of vapour condenser 2, effectively reduced the consumption of the steam of extracting out from steam turbine 1 that is used for the backheat heating, improved the overall thermal efficient of power plant than existing low pressure heating heat regenerative system;
2) effectively reduce the temperature of the cooling circulating water of vapour condenser 2; Therefore reduced the heat load of cooling tower 6; Not only reduced circulating water in low-temperature receiver thermal loss and the evaporation of cooling tower 6, water loss such as dispel; Simultaneously also can select littler cooling water circulating ratio, also promptly reduce the power consumption of vapour condenser cool cycles water pump 7.
The technological scheme of 3) carrying out central heat supply with respect to existing employing absorption heat pump technology for recovery power plant cooling circulating water low temperature exhaust heat, the present invention also has and does not receive heating cycle limit, operation, the better advantage of Economy throughout the year.
Claims (5)
1. power plant's low pressure heating system, it comprises residual heat recovery type low-pressure heater, steam turbine (1), vapour condenser (2), the cooling tower (6) that is connected with vapour condenser (2), main condensate pump (3), the oxygen-eliminating device (5) that is connected with steam turbine (1), vapour condenser cool cycles water pump (7); Said residual heat recovery type low-pressure heater comprises generator (81), condenser (82), vaporizer (83), adsorber (84), solution heat exchanger (85), canned motorpump (86) and throttle valve (87); Vapour condenser (2) links to each other with the steam-expelling port of steam turbine (1); Main condensate pump (3) is positioned at the water of condensation of vapour condenser (2) water of condensation outlet and advances on the low-pressure heater pipeline (11); Vapour condenser cool cycles water pump (7) is positioned on vapour condenser cooling circulating water outlet conduit (9) or the vapour condenser cooling circulating water inlet pipeline (10); Generator (81) links to each other with adsorber (84) through solution heat exchanger (85); The connecting tube that comes out from adsorber (84) oppositely passes solution heat exchanger (85) and is connected to generator (81) behind canned motorpump (86); Vaporizer (83) links to each other with generator (81) through throttle valve (87), condenser (82); It is characterized in that said main condensate pump (3) advances low-pressure heater pipeline (11) through water of condensation and links to each other with the interior heat exchanger pipe bundle of condenser (82) with the interior heat exchanger pipe bundle of adsorber (84), the interior heat exchanger pipe bundle of condenser (82) advances oxygen-eliminating device pipeline (12) through water of condensation and links to each other with oxygen-eliminating device (5); The interior heat exchanger pipe bundle of generator (81) links to each other with steam turbine (1) through extracted steam from turbine pipeline (13), and the interior heat exchanger pipe bundle of vaporizer (83) links to each other with vapour condenser cooling circulating water inlet pipeline (10) with vapour condenser cooling circulating water outlet conduit (9) respectively.
2. according to right 1 described low pressure heating system, it is characterized in that said extracted steam from turbine pipeline (13) is provided with modulating valve.
3. according to right 1 or 2 described low pressure heating systems, it is characterized in that the connecting tube of interior heat exchanger pipe bundle of said vaporizer (83) and vapour condenser cooling circulating water outlet conduit (9) is provided with modulating valve.
4. according to right 3 described low pressure heating systems, it is characterized in that the connecting tube of interior heat exchanger pipe bundle of said vaporizer (83) and vapour condenser cooling circulating water inlet pipeline (10) is provided with modulating valve.
5. according to right 4 described low pressure heating systems, it is characterized in that said residual heat recovery type low-pressure heater can be single-effect type, dual effect type or multiple-effect type.
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| CN201110159422XA CN102828790A (en) | 2011-06-14 | 2011-06-14 | Low-pressure heating system for power plant |
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| CN201110159422XA CN102828790A (en) | 2011-06-14 | 2011-06-14 | Low-pressure heating system for power plant |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104100315A (en) * | 2013-04-12 | 2014-10-15 | 陕西科林能源发展股份有限公司 | Low-temperature heat source power generating system |
| CN105157011A (en) * | 2015-09-22 | 2015-12-16 | 中国华能集团清洁能源技术研究院有限公司 | Device and method for reducing backpressure of steam turbine by using waste heat of exhaust smoke of boiler |
| CN105697076A (en) * | 2016-04-01 | 2016-06-22 | 杭州燃油锅炉有限公司 | Combined heat and power system of large-scale extracting and condensing steam turbine |
| CN106196718A (en) * | 2016-08-16 | 2016-12-07 | 北京联力源科技有限公司 | Absorption type heat pump system and round-robin method thereof |
| CN106196727A (en) * | 2016-08-25 | 2016-12-07 | 北京联力源科技有限公司 | A kind of heat pump and operation method thereof |
| CN107939464A (en) * | 2017-12-21 | 2018-04-20 | 西安热工研究院有限公司 | A kind of CHP Heating System and method of work based on absorption heat pump cycle |
| CN108087949A (en) * | 2017-12-22 | 2018-05-29 | 芜湖德司节能科技有限公司 | A kind of high-efficiency steam heat supply and residual neat recovering system |
| CN108981222A (en) * | 2018-05-23 | 2018-12-11 | 西安交通大学 | A kind of the indirect cool tower circulating water waste heat utilization and method of integrated absorption heat pump |
| CN109028641A (en) * | 2018-05-23 | 2018-12-18 | 西安交通大学 | Cool island circulating water waste heat utilization and method between integrated steam air heater and absorption heat pump |
| CN110594721A (en) * | 2019-10-28 | 2019-12-20 | 河南心连心化学工业集团股份有限公司 | Recovery device for high-temperature steam condensate and waste heat |
| CN110849022A (en) * | 2019-12-06 | 2020-02-28 | 华北电力科学研究院有限责任公司 | Heat gradient utilization system for indirect air cooling system |
| CN111075521A (en) * | 2019-12-18 | 2020-04-28 | 北京石油化工学院 | High-low pressure double working medium ORC power generation system with regenerative cycle |
| CN111578258A (en) * | 2020-06-04 | 2020-08-25 | 浙江佑伏能源科技有限公司 | Device capable of improving energy utilization rate of thermal power plant in non-heating period and use method |
| CN114485203A (en) * | 2022-01-28 | 2022-05-13 | 山西启光发电有限公司 | System and method for reducing backpressure of condenser of air cooling unit |
| 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 |
| CN115468333A (en) * | 2022-07-26 | 2022-12-13 | 华能国际电力股份有限公司上海石洞口第二电厂 | Thermal power plant frequency modulation system with steam pressure tank and heat pump |
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| CN104100315A (en) * | 2013-04-12 | 2014-10-15 | 陕西科林能源发展股份有限公司 | Low-temperature heat source power generating system |
| CN105157011A (en) * | 2015-09-22 | 2015-12-16 | 中国华能集团清洁能源技术研究院有限公司 | Device and method for reducing backpressure of steam turbine by using waste heat of exhaust smoke of boiler |
| CN105697076A (en) * | 2016-04-01 | 2016-06-22 | 杭州燃油锅炉有限公司 | Combined heat and power system of large-scale extracting and condensing steam turbine |
| CN106196718B (en) * | 2016-08-16 | 2019-04-19 | 北京联力源科技有限公司 | Absorption type heat pump system and its round-robin method |
| CN106196718A (en) * | 2016-08-16 | 2016-12-07 | 北京联力源科技有限公司 | Absorption type heat pump system and round-robin method thereof |
| CN106196727A (en) * | 2016-08-25 | 2016-12-07 | 北京联力源科技有限公司 | A kind of heat pump and operation method thereof |
| CN106196727B (en) * | 2016-08-25 | 2019-04-19 | 北京联力源科技有限公司 | A kind of heat pump system and its operation method |
| CN107939464A (en) * | 2017-12-21 | 2018-04-20 | 西安热工研究院有限公司 | A kind of CHP Heating System and method of work based on absorption heat pump cycle |
| CN107939464B (en) * | 2017-12-21 | 2024-03-01 | 西安热工研究院有限公司 | Combined heat and power generation heating system based on absorption heat pump cycle and working method |
| CN108087949A (en) * | 2017-12-22 | 2018-05-29 | 芜湖德司节能科技有限公司 | A kind of high-efficiency steam heat supply and residual neat recovering system |
| CN109028641A (en) * | 2018-05-23 | 2018-12-18 | 西安交通大学 | Cool island circulating water waste heat utilization and method between integrated steam air heater and absorption heat pump |
| CN108981222A (en) * | 2018-05-23 | 2018-12-11 | 西安交通大学 | A kind of the indirect cool tower circulating water waste heat utilization and method of integrated absorption heat pump |
| CN110594721A (en) * | 2019-10-28 | 2019-12-20 | 河南心连心化学工业集团股份有限公司 | Recovery device for high-temperature steam condensate and waste heat |
| CN110849022A (en) * | 2019-12-06 | 2020-02-28 | 华北电力科学研究院有限责任公司 | Heat gradient utilization system for indirect air cooling system |
| CN111075521A (en) * | 2019-12-18 | 2020-04-28 | 北京石油化工学院 | High-low pressure double working medium ORC power generation system with regenerative cycle |
| CN111075521B (en) * | 2019-12-18 | 2022-09-20 | 北京石油化工学院 | High-low pressure double working medium ORC power generation system with regenerative cycle |
| CN111578258A (en) * | 2020-06-04 | 2020-08-25 | 浙江佑伏能源科技有限公司 | Device capable of improving energy utilization rate of thermal power plant in non-heating period and use method |
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Application publication date: 20121219 |