CN203114364U - Waste-heat utilization device in electric power plant - Google Patents
Waste-heat utilization device in electric power plant Download PDFInfo
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- CN203114364U CN203114364U CN 201320108480 CN201320108480U CN203114364U CN 203114364 U CN203114364 U CN 203114364U CN 201320108480 CN201320108480 CN 201320108480 CN 201320108480 U CN201320108480 U CN 201320108480U CN 203114364 U CN203114364 U CN 203114364U
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Abstract
The utility model discloses a waste-heat utilization device in an electric power plant. The waste-heat utilization device in the electric power plant comprises a steam turbine, a generator which is connected with the steam turbine, a condenser which receives steam from the steam turbine and a cooling tower which is connected with the condenser. Exhaust branch pipes are arranged on a steam discharging pipe, connected with the condenser, of the steam turbine, and the exhaust branch pipes are connected with a waste-heat circulating device. An absorption type heat pump is adopted in the waste-heat utilization device in the electric power plant as a waste-heat heater so that a large amount of low-temperature waste heat contained in flue gas which is emitted by the steam turbine can be effectively recycled. According to the technical scheme, the amount of steam which is needed by a low-pressure heater and abstracted from the steam turbine can be obviously reduced, more steam is saved, the saved steam can be used for working or generating electricity or providing heat outward all year round, therefore heat efficiency of the electric power plant is effectively improved, and economical efficiency is good.
Description
Technical field
The utility model relates to power field, is specifically related to the residual heat using device that the heat in a kind of general vapour that utilizes steam turbine in the power plant carries out heat exchange again.
Background technique
In the prior art, have only about 35% to change electric energy in the fuel combustion gross calorific power of thermal power plant, heat energy more than 60% mainly is lost in the environment by the recirculated cooling water of boiler chimney and steam turbine, vapour condenser, and the waste heat that recirculated cooling water carries away accounts for the wherein overwhelming majority.Condensed steam type generator set with a 300MW is example, and its recirculated cooling water thermal discharge is about 454MW, and list says that in quantity this heat can supply 6,000,000 m approximately
2The usefulness of fabrication heating.But because the energy of this part heat is sampled very low (generally below 50 ℃) and never is utilized, most power plant still are discharged in the physical environment by cooling equipment or natural rivers, slattern a large amount of low-temperature receiver heats.For direct air cooling power plant, the full carbuncle on the back of the steam turbine of its design is pressed and is generally about 30kPa, and when summer owing to be subjected to the influence of ambient temperature, turbine back pressure is often up to about 50kPa.Back pressure is too high, not only causes the steam turbine decline of exerting oneself, and its safe operation is constituted a threat to.Cooling tower when cooling off steam turbine in addition and arranging exhaust steam needs a large amount of moving airs as cooling medium, and its large-scale axial-flow blower unit expends a large amount of high-grade electric energy; On the other hand, these air are taken away a large amount of low-grade low temperature exhaust heat heat energy, have also caused the cold source energy of power plant, and this part loss accounts for power generation process and always imports the over half of heat.
Therefore the waste heat heating that utilizes power plant is a kind of important measures that improve the thermal efficiency, reduce boiler load, fuel saving.Comprising of adopting utilizes the extracted steam from turbine heat supply, can effectively reduce the cold junction loss of Steam Power Circulation like this, but thermoelectricity plant still has a large amount of waste heats to be discharged into environment by recirculated cooling water in the actual motion, particularly the thermoelectricity plant of unit is with fixed attention taken out in employing, even under the maximum heat supply operating mode, also must be discharged into environment by circulating water (generally passing through cooling tower) by some heat in the winter time.
It mainly is that a low-pressure heater is installed between vapour condenser and oxygen-eliminating device that another kind utilizes power plant's backheat mode of heating, comes the equipment of heat-setting water with the low-pressure pumping steam of steam turbine.But this mode is primarily aimed at the application direction of central heating in the prior art, and central heating is subjected to the restriction of latitude, heating cycle length, leads that the most of the time heat-pump apparatus all is in idle state in 1 year, causes waste.Oxygen-eliminating device pressure in this external system can change along with the variation of blower fan load, and pressure surge is bigger, and the operation control method of power plant is comparatively complicated.
The model utility content
For solving the lower problem of residual heat of electric power plant utilization ratio in the prior art, the utility model provides a kind of residual heat of electric power plant utilized device that adopts multiple mode to utilize waste heat, concrete scheme is as follows: a kind of residual heat of electric power plant utilized device, comprise steam turbine, the generator that is connected with steam turbine receives the vapour condenser of steam turbine steam and the cooling tower that is connected with vapour condenser, it is characterized in that, the exhaust steam pipe that steam turbine connects vapour condenser is provided with blow-off branch, and described blow-off branch is connected with the waste heat circulation means.
For putting forward the utilization ratio of steam waste heat: described waste heat circulation means comprises a waste heat heater, be provided with the pipeline that spirals in waste heat heater inside, the end of pipeline of spiraling is connected with the heat pump that transforms heat energy by heating tube, the cold water pipe that the other end and the equipment of pipeline of spiraling refluxes is connected, the condensate pipe connection that the other end of cold water pipe and vapour condenser are connected with cooling tower.
Be convenient different user: the heating equipment that described heat pump is connected with.
For taking full advantage of waste heat: described waste heat circulation means comprises the steam heater that is connected with blow-off branch, heat exchanger and waste heat circulator, wherein waste heat heater inside is provided with endothermic solution and reaches the steam pipe coil that is connected with blow-off branch, the other end of steam pipe coil is connected with the condenser that reclaims condensed water, heat exchanger enters by endothermic solution and manages the endothermic solution that receives in the waste heat heater, enter pipe by endothermic solution again endothermic solution is transported to the waste heat circulator, waste heat circulator inside is provided with an end and is connected the pipeline that spirals that the other end is connected with condenser with the cooling tower condensate pipe, and the waste heat circulator is connected with the waste heat heater after passing heat exchanger inside by the endothermic solution discharge tube.
For improving utilization rate of waste heat: be provided with vaporizer between the exhaust steam pipe of described cooling tower and the condensate pipe, steam inlet pipe is connected with the condensate pipe of cooling tower after pipeline is spiraled in the inner formation of vaporizer, and vaporizer one end is connected the other end and is connected with the waste heat circulator with condenser.
It is the waste heat heater that the utility model adopts absorption heat pump, make the contained a large amount of low temperature exhaust heats of exhaust steam that steam turbine is arranged effectively to reclaim, this programme can significantly reduce because the required amount from steam turbine extraction steam of low-pressure heater, save more steam can do work generating or externally heat supply and can throughout the year moving, the thermal efficiency of power plant is effectively improved and good economy performance.Source heat pump heat commonly used is relatively at present compared, and has that stock number is big, temperature is moderate and stable, be conducive to environmental protection raises advantage.This programme is equivalent to enlarge the heat capacity of power plant not increasing power plant's capacity, not increasing under the situation of local discharging.What carry in the pipe network is low-temperature circulating water, and low to the pipe insulation requirement, radiation loss is little, therefore carries cost lower; The efficient characteristics of heat pump also make the comprehensive energy utilization ratio of this heat-supplying mode be higher than conventional boiler room heat-supplying mode in addition.And enforcement of the present utility model can not have a negative impact to the former thermodynamic system of power plant.Effectively reclaim a large amount of low temperature exhaust heats that exhaust steam in steam turbine contains, effectively reduced from the consumption of the steam that is used for the backheat heating of steam turbine extraction than existing low pressure heating heat regenerative system, improved the overall thermal efficient of power plant; Reduce the heat radiation load of cooling tower, not only reduced the cold source energy of exhaust steam at cooling tower, also reduced the power consumption of the axial-flow blower unit of cooling tower simultaneously.When particularly under the summer high temperature condition, moving, can effectively reduce turbine back pressure, guarantee the steam turbine safe operation.The utility model also has and is not subjected to heating cycle limit, throughout the year operation, the better advantage of Economy in addition.
Description of drawings
Fig. 1 residual heat heating structural representation of the present utility model;
The structural representation that Fig. 2 heating of the present utility model and heating are installed simultaneously;
Label declaration in the accompanying drawing: 1-steam turbine, 101-steamer, 102-exhaust steam pipe, 103-blow-off branch, 2-generator, 3-cooling tower, 301-condensate pipe, 4-waste heat heater, 401-recycle pump, 402-heating tube, 403-cold water pipe, 404-steam heater, 405-heat exchanger, 406-waste heat circulator, 407-endothermic solution enter pipe, 408-endothermic solution discharge tube, 409-condenser, 410-vaporizer, 411-5-heat pump, 6-heating equipment.
Embodiment
As shown in Figure 1, residual heat of electric power plant utilized device of the present utility model, comprise steam turbine 1, the generator 2 that is connected with steam turbine 1, receive the vapour condenser 101 of steam turbine 1 steam and the cooling tower 3 that is connected with vapour condenser 101, the exhaust steam pipe 102 that steam turbine 1 connects vapour condenser 101 is provided with blow-off branch 103, and blow-off branch 103 is connected with the waste heat circulation means.
The working method of conventional power plant is: the steam from boiler enters steam turbine 1 acting, drive generator 2 generatings, exhaust steam enters vapour condenser 101 through the exhaust steam pipe 102 of steam turbine 1, be recycled water quench after condensation heat become water of condensation, return boiler by condensate pipe 301, finish a circulation.And recirculated cooling water absorbs in the vapour condenser 101 steam and condenses and heat up behind the liberated heat, under the driving of circulating water pump, enter cooling tower 3 heat releases cooling, cooling tower 3 is discharged into heat in the environment, circulating water after the cooling enters vapour condenser 101 heat absorptions again by the wet pit of cooling tower 3, finishes a circulation.In said process, the utility model is exactly to utilize the general vapour of steam turbine 1 to be transported to by special exhaust steam pipe 102 in the waste heat circulation means that utilizes general vapour waste heat to heat or heat, to improve or to strengthen the utilization ratio of residual heat of electric power plant.Heated water can be water of condensation, also can be that hot net water, domestic water and other need the water source of heat exchange.
Concrete waste heat circulation means comprises a waste heat heater 4, be provided with the pipeline that spirals in waste heat heater 4 inside, spiral pipeline an end by heating tube 402 with the conversion heat energy heat pump 5 be connected, the cold water pipe 403 that the other end and the equipment of pipeline of spiraling refluxes is connected, condensate pipe 301 connections that the other end of cold water pipe and vapour condenser 101 are connected with cooling tower 3.Waste heat heater 4 can be the shell heater of surface-type, also can be hybrid-type deaerating heater.To hybrid-type oxygen-eliminating device, the corresponding configuration condensate booster pump.
With the vapour condenser 101 in parallel waste heat heater 4 of the utility model by increasing, by pipeline with power plant steam turbine 1 steam discharge all or part of the branch to waste heat heater 4, heating tube is heated in heat release when utilizing general vapour to condense, for providing thermal source with hot equipment, and the water of condensation that condenses into after the cooling of general vapour in the waste heat heater, the water of condensation of condensation is delivered to boiler again and is carried out recycling in vapour condenser.After water in the heating tube absorbs heat in the waste heat heater and heats up, carry out temperature increase by heating tube again by heat pump, be transported to equipment or the user place that uses heat energy after reaching requirement, use the water of back cooling to turn back to the waste heat heater by cold water pipe through equipment or user, heat absorption is transported to the user after heating up again in the waste heat heater, reaches the purpose that residual heat of electric power plant is used for heat supply through constantly circulating.The former cooling system in power station this moment plays a part to stablize the turbine discharge back pressure, if namely when the thermal discharge of waste heat heater during greater than user's total load, the temperature of water raises in the hot-water line, cause steam turbine exhaust pressure to raise, this moment is by adjusting the thermal discharge that increases cooling tower, with the condensation number that strengthens vapour condenser and the condensation heat amount that reduces the waste heat heater, heat load and user's calorific requirement of waste heat heater are complementary, thereby turbine back pressure is stabilized within the scope of requirement, and vice versa.Heat pump absorbs heat from circulating water and supplies with the user, and under the situation of carrying same heat, the temperature difference between hot water and the backwater is more big, and the flow of circulating water is just more little, and pipe network initial cost and conveying energy consumption are also just more little.
Heat pump of the present utility model adopts absorption heat pump, mainly nonelectrical energy or mechanical energy drive by heat energy for it, low grade residual heat can be promoted to more high-grade and be recycled, a large amount of low grade residual heats that therefore exhaust steam is contained to power plant steam turbine can adopt absorption heat pump to be reclaimed.Be example to adopt lithium-bromide solution as the right single-effective absorption heat pump of working medium, it enters heat pump by the high temperature driven thermal source as 0.1～1.0MPa, 20～60 ℃ low temperature exhaust heat, after transforming absorption, make higher temperature as 60～100 ℃ hot water, its coefficient of performance about 1.8, namely the low pressure steam of 1 part of heat is the low temperature exhaust heat of recyclable 0.8 part of heat, finally makes the hot water of the higher temperature of 1.8 parts of heats.For accelerating the flow velocity of water in the pipe, heating tube or cold water pipe are provided with the recycle pump of accelerating water circulation in the pipe.
As shown in Figure 2, for taking full advantage of the heat in the general vapour, waste heat circulation means of the present utility model comprises the steam heater 404 that is connected with blow-off branch 103, heat exchanger 405 and waste heat circulator 406, wherein steam heater 404 inside are provided with endothermic solution and reach the steam pipe coil that is connected with blow-off branch 103, the other end of steam pipe coil is connected with the condenser 409 that reclaims condensed water, heat exchanger 405 enters the endothermic solution that pipe 407 receives in the steam heater 404 by endothermic solution, enter pipe 407 by endothermic solution again endothermic solution is transported to waste heat circulator 406, waste heat circulator 406 inside are provided with an end and are connected the pipeline that spirals that the other end is connected with condenser 409 with cooling tower 3 condensate pipes 301, and waste heat circulator 406 passes heat exchanger 405 inner backs by endothermic solution discharge tube 408 and is connected with steam heater 404.
The equipment of this programme is installed on the pipeline between steam turbine 1 and the cooling tower 3, the endothermic solution of steam heater 404 inside in the waste heat circulation means adopts lithium-bromide solution, the blow-off branch 103 of being drawn by steam turbine 1 forms steam pipe coils in steam heater 404 inside, the higher general vapour of temperature passes through the lithium-bromide solution in the steam pipe coil heating steam heater 404, emit working-medium water steam after lithium-bromide solution is heated and improve the concentration of self, the working-medium water steam is delivered in the condenser 409 by the pipeline at steam heater 404 tops, heated lithium-bromide solution enters pipe 407 by the bottom of steam heater 404 by endothermic solution and is discharged in the heat exchanger 405, again by delivering in the heat exchanger 405 in the waste heat circulator 406, condensed water after being condensed by cooling tower 3 steam passes waste heat circulator 406 by condensate pipe 301, get back in the boiler circulatory system behind the condenser 409, wherein condensate pipe 301 all is that the spiral form of pipeline exists in waste heat circulator 406 and condenser 409, can fully absorb the heat of lithium-bromide solution like this, lithium-bromide solution in the waste heat circulator 406 is after discharging heat, thereby can absorb the working-medium water steam and reduce the concentration of self, lithium-bromide solution after the dilution passes by endothermic solution discharge tube 408 and gets back in the steam heater 404 after heat exchanger 405 is tentatively heated, and this moment, lithium-bromide solution formed a heat absorption-heat release circulation.For taking full advantage of the water of internal system, the utility model is provided with vaporizer 410 between the exhaust steam pipe 102 of cooling tower 3 and condensate pipe 301, exhaust steam pipe 102 is connected with the condensate pipe 301 of cooling tower 3 after pipeline is spiraled in vaporizer 410 inner formation, and vaporizer 410 1 ends are connected the other end and are connected with waste heat circulator 406 with condenser 409.Vaporizer 410 just can provide the working-medium water steam for waste heat circulator 406 like this.Each pipeline at equipment is installed break-make and the flow adjustment of modulating valve to control each pipeline.
The working-medium water steam that discharges that is heated in the steam heater 404 is sent into condenser 409 through connecting pipe, and is subjected to the cooling of hot water backwater in the heat exchanger pipe bundle and release heat condenses into working-medium water; Working-medium water is sent into vaporizer after throttle valve reduces pressure, and is subjected to the heating of waste heat in the vaporizer heat exchanger pipe bundle and absorbs the latent heat of vaporization and become the working-medium water steam, and the working-medium water steam enters the waste heat circulator by connecting pipeline, the above-mentioned circulation that constitutes working-medium water.
Scheme of the present utility model can independently be implemented also can merge enforcement, to utilize local resources to greatest extent, cuts the waste.The low pressure steam of being extracted out by steam turbine (being generally the saturated vapour of 0.1～lMPa) drives generator as high temperature heat source, hydrophobic oxygen-eliminating device or the condensing water tank of delivering to steam generator system that condenses after the low pressure steam heat release and produce; (general pressure is 10～50kPa) to drive vaporizer as low-temperature heat source in the exhaust steam of being discharged by steam turbine, because evaporator pressure is very low, working-medium water is vaporized at a lower temperature, absorbs the contained condensation latent heat of exhaust steam simultaneously, becomes the hydrophobic condensate water tank of sending back to after the exhaust steam condensation; Lithium-bromide solution in the waste heat circulator working-medium water steam that parses that is heated is sent in the condenser, back condensation and discharge the latent heat of condensation is cooled, water is heated and is vaporizated into the working-medium water steam and sends into the waste heat circulator again in the vaporizer, and it is hot to be absorbed and discharge absorption by lithium-bromide solution, owing to be provided with modulating valve on the extracted steam from turbine pipeline, heat exchanger pipe bundle also is provided with modulating valve in the vaporizer on two pipelines of condensate water tank and turbine discharge pipeline, like this, can suitably adjust the ratio that enters the exhaust steam of air cooling condenser and enter the exhaust steam of vaporizer according to different temperature conditions and the steam turbine situation of exerting oneself.For example, during summer, raising as much as possible enters the ratio of the exhaust steam of vaporizer, to reduce the heat radiation load of air cooling condenser, guarantees its safe production in summer; During winter, then suitably reduce the ratio of the exhaust steam that enters vaporizer, to guarantee the antifreeze required minimum thermal flow of air cooling condenser; And under severe winter extreme cold condition, the exhaust steam of leading to air cooling condenser can be cut off, and make exhaust steam in steam turbine all enter vaporizer, thus air cooling condenser is not worked and it is antifreeze to keep inner vacuum also can accomplish.
The above only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model, anyly be familiar with the technician of this patent in not breaking away from the technical solutions of the utility model scope, when the technology contents that can utilize above-mentioned prompting is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solutions of the utility model, any simple modification that foundation technical spirit of the present utility model is done above embodiment, equivalent variations and modification all still belong in the scope of the utility model scheme.
Claims (5)
1. residual heat of electric power plant utilized device, comprise steam turbine (1), the generator that is connected with steam turbine (2), receive the vapour condenser (101) of steam turbine steam and the cooling tower (3) that is connected with vapour condenser, it is characterized in that, the exhaust steam pipe (102) that steam turbine connects vapour condenser is provided with blow-off branch (103), and described blow-off branch (103) is connected with the waste heat circulation means.
2. a kind of residual heat of electric power plant utilized device as claimed in claim 1, it is characterized in that, described waste heat circulation means comprises a waste heat heater (4), be provided with the pipeline that spirals in waste heat heater (4) inside, spiral pipeline an end by heating tube (402) with the conversion heat energy heat pump (5) be connected, the cold water pipe (403) that the other end and the equipment of pipeline of spiraling refluxes is connected, condensate pipe (301) connection that the other end of cold water pipe (403) and vapour condenser (101) are connected with cooling tower (3).
3. a kind of residual heat of electric power plant utilized device as claimed in claim 2 is characterized in that, the heating equipment (6) that described heat pump (5) is connected with.
4. a kind of residual heat of electric power plant utilized device as claimed in claim 3, it is characterized in that, described waste heat circulation means comprises the steam heater (404) that is connected with blow-off branch (102), heat exchanger (405) and waste heat circulator (406), wherein steam heater (404) inside is provided with endothermic solution and reaches the steam pipe coil that is connected with blow-off branch (102), the other end of steam pipe coil is connected with the condenser (409) that reclaims condensed water, heat exchanger (405) enters pipe (407) by endothermic solution and receives the interior endothermic solution of steam heater (404), enter pipe (407) by endothermic solution again endothermic solution is transported to waste heat circulator (406), waste heat circulator (406) inside is provided with an end and is connected the pipeline that spirals that the other end is connected with condenser (409) with cooling tower (3) condensate pipe (301), and waste heat circulator (406) passes the inner back of heat exchanger (405) by endothermic solution discharge tube (408) and is connected with steam heater (404).
5. a kind of residual heat of electric power plant utilized device as claimed in claim 4, it is characterized in that, be provided with vaporizer (410) between the exhaust steam pipe (102) of described cooling tower (3) and the condensate pipe (301), exhaust steam pipe (102) is connected with the condensate pipe (301) of cooling tower (3) after pipeline is spiraled in the inner formation of vaporizer (410), and vaporizer (410) one ends are connected the other end and are connected with waste heat circulator (406) with condenser (409).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320108480 CN203114364U (en) | 2013-03-11 | 2013-03-11 | Waste-heat utilization device in electric power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320108480 CN203114364U (en) | 2013-03-11 | 2013-03-11 | Waste-heat utilization device in electric power plant |
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| CN203114364U true CN203114364U (en) | 2013-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320108480 Expired - Lifetime CN203114364U (en) | 2013-03-11 | 2013-03-11 | Waste-heat utilization device in electric power plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840256A (en) * | 2016-05-18 | 2016-08-10 | 中国大唐集团科学技术研究院有限公司 | Utilization system of dead steam heat of power plant |
| CN109028649A (en) * | 2017-06-09 | 2018-12-18 | 西安巨杉能源技术有限公司 | City summer central cooling is given by power of steam power plant's steam exhaust |
-
2013
- 2013-03-11 CN CN 201320108480 patent/CN203114364U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840256A (en) * | 2016-05-18 | 2016-08-10 | 中国大唐集团科学技术研究院有限公司 | Utilization system of dead steam heat of power plant |
| CN109028649A (en) * | 2017-06-09 | 2018-12-18 | 西安巨杉能源技术有限公司 | City summer central cooling is given by power of steam power plant's steam exhaust |
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Address after: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee after: DATANG ENVIRONMENT INDUSTRY GROUP Co.,Ltd. Address before: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee before: CHINA DATANG GROUP ENVIRONMENT TECHNOLOGY CO.,LTD. |
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Granted publication date: 20130807 |