CN202195715U - Power plant steam-water system with an exhaust steam heat exchange system - Google Patents

Power plant steam-water system with an exhaust steam heat exchange system Download PDF

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Publication number
CN202195715U
CN202195715U CN2011202677329U CN201120267732U CN202195715U CN 202195715 U CN202195715 U CN 202195715U CN 2011202677329 U CN2011202677329 U CN 2011202677329U CN 201120267732 U CN201120267732 U CN 201120267732U CN 202195715 U CN202195715 U CN 202195715U
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China
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condenser
pressure heater
pipeline
low
pump
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Expired - Lifetime
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CN2011202677329U
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Chinese (zh)
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闫平
王昕�
翁燕珠
邢苍
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Huadian Heavy Industries Co Ltd
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Huadian Heavy Industries Co Ltd
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Abstract

The utility model discloses a power plant steam-water system with an exhaust steam heat exchange system, comprising a boiler, a superheater, a steam turbine, an indirect air cooling system, a condensed water pump, a condensed water refined processing device, an axle seal condenser, a low pressure heater, a deoxygenator, a water feed pump and a high pressure heater, which are connected in turn by pipelines, wherein the indirect air cooling system comprises a steam condenser, a cooling tower, a cycle water pump and a heat radiator, an exhaust steam extraction pipeline is arranged on the connection pipeline of the steam turbine and the indirect air cooling system, the exhaust steam extraction pipeline is connected with a heat pump system, a heat pump evaporator side is connected with an outlet end of the steam condenser by the pipeline; a heat pump condenser side is connected with the low pressure heater or the axle seal condenser by a condensed water input pipeline and a condensed water output pipeline. The waste in the heat energy of the power plant and the building size of the cooling tower in the indirect air cooling system are effectively reduced and the number of heat exchange pipe beams in the cooling tower and the loss in heat energy are also reduced.

Description

A kind of power plant's boiler circuit with the exhaust steam heat-exchange system
Technical field
The utility model relates to a kind of power plant boiler circuit, particularly a kind of power plant's boiler circuit with the exhaust steam heat-exchange system.
Background technology
Human daily life be unable to do without electricity, and along with the progress of society, people are increasing to the demand of electric power.The consciousness of protecting along with current environment deepens continuously, and the day by day exhausted present situation of non-renewable resources is paid attention to day by day the energy-saving and cost-reducing corporation responsibility that becomes the whole society gradually.
Circulating cooling system is an important step in the power production process; Use in the power plant of indirect cooling system at some; Exhaust steam in steam turbine gets into surface-type or direct-contact type condenser; Through a large amount of recirculated waters it is cooled off, recirculated water gets into the radiator tube bank that is arranged in the cooling tower again, is cooled off by air.Adopt the power plant of this indirect cooling system need build large cooling column, and the floor space of cooling tower is very big, and a large amount of heat exchanger tubes need be set in the tower, the equipment initial investment is very high.Simultaneously, enter atmosphere through the heat energy that is discharged after the heat-exchanging tube bundle heat exchange and caused the waste of heat energy and the thermal pollution around the cooling tower.
The utility model content
The purpose of the utility model is; A kind of power plant's boiler circuit with the exhaust steam heat-exchange system is provided, can effectively reduces the waste of exhaust steam of electric power plant heat energy, and can effectively reduce the building size of cooling tower in the indirect air cooling system; Reduce the consumption of cooling tower inner radiator, and reduce the loss of heat energy.
The technical scheme of the utility model: a kind of power plant's boiler circuit with the exhaust steam heat-exchange system; Comprise boiler, superheater, steam turbine, indirect air cooling system, condensate pump, the polishing unit that condenses, axle envelope condenser, low-pressure heater, oxygen-eliminating device, feed pump and high-pressure heater; Boiler, superheater, steam turbine, indirect air cooling system, condensate pump, the polishing unit that condenses, low-pressure heater, oxygen-eliminating device, feed pump, high-pressure heater connect through pipeline successively; Said indirect air cooling system comprises condenser, cooling tower, water circulating pump and radiator; The connecting line of steam turbine and indirect air cooling system is provided with exhaust steam and draws pipeline; Exhaust steam is drawn pipeline and is connected with heat pump, and heat pump is connected with the port of export of condenser through pipeline; Heat pump also is connected with low-pressure heater or axle envelope condenser with the condensate output pipe through the condensate intake line.The purpose that increases heat pump is; On the one hand since part turbine low pressure cylinder outlet exhaust steam taken away for heat pump used; Reduced the exhaust steam amount that indirect air cooling system carries out condensation that gets into; Thereby can dwindle the size of cooling tower and reduce the use amount of replace tubes bundle in the tower, reach the purpose of dwindling cooling tower floor space and less thermal waste; Be thermal source with this part exhaust steam in steam turbine that extracts on the other hand; Utilize heat pump that condensate is heated; Improve the condensing water temperature of low-pressure heater inlet, reduce the required extracted steam from turbine consumption of low-pressure heater, and this part amount of drawing gas can be participated in the steam acting link of steam turbine; Improve Efficiency of Steam Turbine, further practiced thrift the energy.
In power plant's boiler circuit of aforesaid band exhaust steam heat-exchange system; Said heat pump comprises evaporimeter, compressor and condenser; Evaporimeter, compressor and condenser are connected through pipeline successively; The admission end of evaporimeter is drawn pipeline with exhaust steam and is connected, and the port of export of evaporimeter is connected with the port of export of condenser through pipeline; The inlet of condenser is connected with the arrival end of low-pressure heater through the condensate intake line, and the liquid outlet of condenser connects through the port of export of condensate output pipe low-pressure heater.The inlet of condenser is passed through the port of export connection that the condensate intake line is connected with the arrival end of low-pressure heater, the liquid outlet of condenser passes through condensate output pipe low-pressure heater; Absorb heat through send into the heat pump condenser from main condensate pipeline extension condensate; And improve the temperature of condensate, its objective is in order to reduce this grade low-pressure heater condensing capacity, and then reduce the required extracted steam from turbine amount of low-pressure heater; Extracted steam from turbine amount after the minimizing can be used for increasing steam turbine acting steam share and compensate pairing merit value; Under the condition that merit is equal to, the senior more saving of drawing gas, the steam turbine throttle flow of saving is many more; It is also many more to practice thrift coal consumption, thereby reaches the effect of utilizing exhaust steam in steam turbine energy-conservation.
In power plant's boiler circuit of aforesaid band exhaust steam heat-exchange system; Low-pressure heater comprises one-level low-pressure heater, secondary low-pressure heater, three grades of low-pressure heaters; The inlet of condenser is connected through the arrival end of any one-level heater in condensate intake line and one-level low-pressure heater, secondary low-pressure heater or the three grades of low-pressure heaters, and the liquid outlet of condenser passes through the condensate output pipe and is connected with the port of export of this grade heater.Different according to unit capacity with configuration, the low-pressure heater of varying number can be set.
In power plant's boiler circuit of aforesaid band exhaust steam heat-exchange system; Said heat pump comprises evaporimeter, compressor and condenser; Evaporimeter, compressor and condenser are connected through pipeline successively; The admission end of evaporimeter is drawn pipeline with exhaust steam and is connected, and the port of export of evaporimeter is connected with the port of export of condenser through pipeline; The inlet of condenser is connected through the arrival end of condensate intake line with axle envelope condenser, and the liquid outlet of condenser is connected through the port of export of condensate output pipe with axle envelope condenser.The inlet of condenser is connected through the arrival end of condensate intake line with axle envelope condenser; The liquid outlet of condenser is connected through the port of export of condensate output pipe with axle envelope condenser; Absorb heat through send into the heat pump condenser from main condensate pipeline extension condensate; Its objective is in order to improve low-pressure heater inlet condensing water temperature behind the condenser that draws gas under the low back pressure condition, thereby reduce the required extracted steam from turbine amount of low-pressure heater.
In power plant's boiler circuit of aforesaid band exhaust steam heat-exchange system, the condensate output pipe that is connected with the liquid outlet of condenser is provided with force (forcing) pump.The effect of force (forcing) pump is: after condensate is absorbed heat through condenser, overcome as being sent back to low-pressure heater behind the exhaust steam heat-exchanger rig resistance of bypath system through the force (forcing) pump pressurization.
Compared with prior art; The utility model is owing to increased heat pump; The part exhaust steam in steam turbine carries out heat exchange through the evaporimeter in the heat pump, and heat discharges to condensate through condenser then, thereby has improved low-pressure heater inlet condensing water temperature; Reduce the amount of drawing gas of low-pressure heater consumption steam turbine, reduced the consumption of energy.Extracted steam from turbine amount after the minimizing can be used for increasing steam turbine acting steam share and compensate pairing merit value, and the steam turbine throttle flow of saving is many more, and the saving coal consumption is also many more, thereby reaches the energy-conservation effect of exhaust steam in steam turbine.In addition, because the part exhaust steam is utilized by heat pump, so the exhaust steam heat of indirect air cooling system has reduced, the size that can reduce the consumption of cooling tower inner radiator and dwindle cooling tower realizes dwindling floor space, reduces the purpose of investment of equipment.The type selecting parameter of each equipment in the indirect air cooling system all can correspondingly reduce simultaneously, has reached the energy conservation object of indirect air cooling system.
Description of drawings
Fig. 1 is that the indirect air cooling system that is provided with heat pump is simplified boiler circuit figure;
Fig. 2 is the partial structurtes sketch map that condenser is connected with the secondary low-pressure heater;
Fig. 3 is the partial structurtes sketch map that condenser is connected with three grades of low-pressure heaters;
Fig. 4 is the partial structurtes sketch map that condenser is connected with axle envelope condenser.
Being labeled as in the accompanying drawing: 1-boiler, 2-superheater, 3-steam turbine, 4-indirect air cooling system, 5-condensate pump, the 6-polishing unit that condenses; The 7-low-pressure heater, 8-oxygen-eliminating device, 9-feed pump, 10-high-pressure heater, 11-condenser; The 12-cooling tower, the 13-water circulating pump, the 14-radiator, 15-axle envelope condenser, pipeline is drawn in the 16-exhaust steam; The 17-heat pump, 18-evaporimeter, 19-compressor, 20-condenser, 21-condensate intake line; 22-condensate output pipe, 23-force (forcing) pump, 71-one-level low-pressure heater, 72-secondary low-pressure heater, three grades of low-pressure heaters of 73-.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further described, but not as the foundation to the utility model restriction.
The embodiment 1 of the utility model: as shown in Figure 1; Power plant's boiler circuit of band exhaust steam heat-exchange system; Comprise boiler 1, superheater 2, steam turbine 3, indirect air cooling system 4, condensate pump 5, the polishing unit 6 that condenses, axle envelope condenser 15, low-pressure heater 7, oxygen-eliminating device 8, feed pump 9 and high-pressure heater 10; Boiler 1, superheater 2, steam turbine 3, indirect air cooling system 4, condensate pump 5, the polishing unit 6 that condenses, low-pressure heater 7, oxygen-eliminating device 8, feed pump 9, high-pressure heater 10 connect through pipeline successively; Said indirect air cooling system 4 comprises condenser 11, cooling tower 12, water circulating pump 13 and radiator 14; The connecting line of steam turbine 3 and indirect air cooling system 4 is provided with exhaust steam and draws pipeline 16; Exhaust steam is drawn pipeline 16 and is connected with heat pump 17, and heat pump 17 is connected with the port of export of condenser 11 through pipeline.
Said heat pump 17 comprises evaporimeter 18, compressor 19 and condenser 20; Evaporimeter 18, compressor 19 and condenser 20 are connected through pipeline successively; The admission end of evaporimeter 18 is drawn pipeline 16 with the exhaust steam on the turbine low pressure cylinder outlet gland steam exhauster and is connected, and the port of export of evaporimeter 18 is connected with the port of export of condenser 11 through pipeline; The inlet of condenser 20 is connected with the arrival end of one-level low-pressure heater 71 through condensate intake line 21, and the liquid outlet of condenser 20 is connected with the port of export of one-level low-pressure heater 71 through condensate output pipe 22.Condensate output pipe 22 is provided with force (forcing) pump 23.
The embodiment 2 of the utility model: as shown in Figure 1; Power plant's boiler circuit of band exhaust steam heat-exchange system; Comprise boiler 1, superheater 2, steam turbine 3, indirect air cooling system 4, condensate pump 5, the polishing unit 6 that condenses, axle envelope condenser 15, low-pressure heater 7, oxygen-eliminating device 8, feed pump 9 and high-pressure heater 10; Boiler 1, superheater 2, steam turbine 3, indirect air cooling system 4, condensate pump 5, the polishing unit 6 that condenses, low-pressure heater 7, oxygen-eliminating device 8, feed pump 9, high-pressure heater 10 connect through pipeline successively; Said indirect air cooling system 4 comprises condenser 11, cooling tower 12, water circulating pump 13 and radiator 14; The connecting line of steam turbine 3 and indirect air cooling system 4 is provided with exhaust steam and draws pipeline 16; Exhaust steam is drawn pipeline 16 and is connected with heat pump 17, and heat pump 17 is connected with the port of export of condenser 11 through pipeline.
Said heat pump 17 comprises evaporimeter 18, compressor 19 and condenser 20; Evaporimeter 18, compressor 19 and condenser 20 are connected through pipeline successively; The admission end of evaporimeter 18 is drawn pipeline 16 with exhaust steam and is connected, and the port of export of evaporimeter 18 is connected with the port of export of condenser 11 through pipeline;
As shown in Figure 2, the inlet of condenser 20 is connected with the arrival end of secondary low-pressure heater 72 through condensate intake line 21, and the liquid outlet of condenser 20 is connected with the port of export of secondary low-pressure heater 72 through condensate output pipe 22.Condensate output pipe 22 is provided with force (forcing) pump 23.
The embodiment 3 of the utility model: as shown in Figure 1; Power plant's boiler circuit of band exhaust steam heat-exchange system; Comprise boiler 1, superheater 2, steam turbine 3, indirect air cooling system 4, condensate pump 5, the polishing unit 6 that condenses, axle envelope condenser 15, low-pressure heater 7, oxygen-eliminating device 8, feed pump 9 and high-pressure heater 10; Boiler 1, superheater 2, steam turbine 3, indirect air cooling system 4, condensate pump 5, the polishing unit 6 that condenses, low-pressure heater 7, oxygen-eliminating device 8, feed pump 9, high-pressure heater 10 connect through pipeline successively; Said indirect air cooling system 4 comprises condenser 11, cooling tower 12, water circulating pump 13 and radiator 14; The connecting line of steam turbine 3 and indirect air cooling system 4 is provided with exhaust steam and draws pipeline 16; Exhaust steam is drawn pipeline 16 and is connected with heat pump 17, and heat pump 17 is connected with the port of export of condenser 11 through pipeline.
Said heat pump 17 comprises evaporimeter 18, compressor 19 and condenser 20; Evaporimeter 18, compressor 19 and condenser 20 are connected through pipeline successively; The admission end of evaporimeter 18 is drawn pipeline 16 with exhaust steam and is connected, and the port of export of evaporimeter 18 is connected with the port of export of condenser 11 through pipeline;
As shown in Figure 3, the inlet of condenser 20 is connected with the arrival end of three grades of low-pressure heaters 73 through condensate intake line 21, and the liquid outlet of condenser 20 is connected with the port of export of three grades of low-pressure heaters 73 through condensate output pipe 22.Condensate output pipe 22 is provided with force (forcing) pump 23.
The embodiment 4 of the utility model: as shown in Figure 1; Power plant's boiler circuit of band exhaust steam heat-exchange system; Comprise boiler 1, superheater 2, steam turbine 3, indirect air cooling system 4, condensate pump 5, the polishing unit 6 that condenses, axle envelope condenser 15, low-pressure heater 7, oxygen-eliminating device 8, feed pump 9 and high-pressure heater 10; Boiler 1, superheater 2, steam turbine 3, indirect air cooling system 4, condensate pump 5, the polishing unit 6 that condenses, low-pressure heater 7, oxygen-eliminating device 8, feed pump 9, high-pressure heater 10 connect through pipeline successively; Said indirect air cooling system 4 comprises condenser 11, cooling tower 12, water circulating pump 13 and radiator 14; The connecting line of steam turbine 3 and indirect air cooling system 4 is provided with exhaust steam and draws pipeline 16; Exhaust steam is drawn pipeline 16 and is connected with heat pump 17, and heat pump 17 is connected with the port of export of condenser 11 through pipeline.
Said heat pump 17 comprises evaporimeter 18, compressor 19 and condenser 20; Evaporimeter 18, compressor 19 and condenser 20 are connected through pipeline successively; The admission end of evaporimeter 18 is drawn pipeline 16 with exhaust steam and is connected, and the port of export of evaporimeter 18 is connected with the port of export of condenser 11 through pipeline;
As shown in Figure 4, the inlet of condenser 20 is connected through the arrival end of condensate intake line 21 with axle envelope condenser 15, and the liquid outlet of condenser 20 is connected through the port of export of condensate output pipe 22 with axle envelope condenser 15.Condensate output pipe 22 is provided with force (forcing) pump 23.
The operation principle of the utility model: the exhaust steam part that steam turbine 3 is discharged gets into indirect air cooling system 4 through jet chimney, and another part is drawn pipeline 16 through exhaust steam and got into heat pump 17.
The exhaust steam and the evaporimeter 18 that get into heat pump 17 carry out heat exchange; Condensed exhaust steam condensate liquid gets into main condensate water system through the port of export that pipeline is delivered to condenser 11; The condenser 20 of heat pump 17 discharges heat to taking from the preceding ducted condensate of main condensate of shaft sealing cooler 15 inlets; After heat absorption heats up, be transported to a port of export of envelope condenser 15 through force (forcing) pump 23; Perhaps before the low-pressure heater inlet of certain one-level, get condensate, send into heat pump 12, turn back to the exit of this grade heater after the heating.
The exhaust steam that gets into indirect air cooling system 4 enters into surface-type or direct-contact type condenser 11; Through a large amount of recirculated waters it is cooled off; Recirculated water gets into through water circulating pump 13 pressurization backs and is arranged in the radiator 14 of cooling tower 12; Produce heat exchange with air, cooled recirculated water returns condenser and proceeds heat absorption; Exhaust steam forms condensate through condensation after the heat exchange of condenser 11; Deliver to the removal that condensed water precision processing system 6 carries out soluble salts and metal species impurity; Getting into low-pressure heater 7 afterwards heats; Through oxygen-eliminating device 8 deoxygenations, boost after high-pressure heater 10 further is delivered to boiler 1 after the pressurization, as the feedwater of boiler then by feed pump 9.

Claims (5)

1. power plant's boiler circuit with the exhaust steam heat-exchange system; Comprise boiler (1), superheater (2), steam turbine (3), indirect air cooling system (4), condensate pump (5), the polishing unit that condenses (6), axle envelope condenser (15), low-pressure heater (7), oxygen-eliminating device (8), feed pump (9) and high-pressure heater (10); Boiler (1), superheater (2), steam turbine (3), indirect air cooling system (4), condensate pump (5), the polishing unit that condenses (6), low-pressure heater (7), oxygen-eliminating device (8), feed pump (9), high-pressure heater (10) connect through pipeline successively; Said indirect air cooling system (4) comprises condenser (11), cooling tower (12), water circulating pump (13) and radiator (14); It is characterized in that: the connecting line of steam turbine (3) and indirect air cooling system (4) is provided with exhaust steam and draws pipeline (16); Exhaust steam is drawn pipeline (16) and is connected with heat pump (17), and heat pump (17) is connected with the port of export of condenser (11) through pipeline; Heat pump (17) also is connected with low-pressure heater (7) or axle envelope condenser (15) with condensate output pipe (22) through condensate intake line (21).
2. a kind of power plant's boiler circuit according to claim 1 with the exhaust steam heat-exchange system; It is characterized in that: said heat pump (17) comprises evaporimeter (18), compressor (19) and condenser (20); Evaporimeter (18), compressor (19) and condenser (20) are connected through pipeline successively; The admission end of evaporimeter (18) is drawn pipeline (16) with exhaust steam and is connected, and the port of export of evaporimeter (18) is connected with the port of export of condenser (11) through pipeline; The inlet of condenser (20) is connected with the arrival end of low-pressure heater (7) through condensate intake line (21), and the liquid outlet of condenser (20) is connected with the port of export of low-pressure heater (7) through condensate output pipe (22).
3. a kind of power plant's boiler circuit according to claim 2 with the exhaust steam heat-exchange system; It is characterized in that: low-pressure heater (7) comprises one-level low-pressure heater (71), secondary low-pressure heater (72), three grades of low-pressure heaters (73); The inlet of condenser (20) is connected through the arrival end of any one-level heater in condensate intake line (21) and one-level low-pressure heater (71), secondary low-pressure heater (72) or the three grades of low-pressure heaters (73), and the liquid outlet of condenser (20) passes through condensate output pipe (22) and is connected with the port of export of this grade heater.
4. a kind of power plant's boiler circuit according to claim 1 with the exhaust steam heat-exchange system; It is characterized in that: said heat pump (17) comprises evaporimeter (18), compressor (19) and condenser (20); Evaporimeter (18), compressor (19) and condenser (20) are connected through pipeline successively; The admission end of evaporimeter (18) is drawn pipeline (16) with exhaust steam and is connected, and the port of export of evaporimeter (18) is connected with the port of export of condenser (11) through pipeline; The inlet of condenser (20) is connected through the arrival end of condensate intake line (21) with axle envelope condenser (15), and the liquid outlet of condenser (20) is connected through the port of export of condensate output pipe (22) with axle envelope condenser (15).
5. according to claim 2 or 4 described a kind of power plant's boiler circuits with the exhaust steam heat-exchange system, it is characterized in that: the condensate output pipe (22) that is connected with the liquid outlet of condenser (20) is provided with force (forcing) pump (23).
CN2011202677329U 2011-07-27 2011-07-27 Power plant steam-water system with an exhaust steam heat exchange system Expired - Lifetime CN202195715U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103245205A (en) * 2013-05-16 2013-08-14 国家电网公司 Combined condensed steam heat exchange system for direct air cooling steam turbine
CN103334802A (en) * 2013-06-26 2013-10-02 山东电力工程咨询院有限公司 Thermoelectric-coupling type comprehensive energy-utilizing system based on air-cooling device and working method
CN104359223A (en) * 2014-11-28 2015-02-18 中国华能集团公司 System and method for using waste steam of steam turbine as thermal medium of air heater of power plant boiler
CN105417609A (en) * 2015-12-07 2016-03-23 华北电力大学(保定) Method for adjusting dissolved gases in boiler feed water

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103245205A (en) * 2013-05-16 2013-08-14 国家电网公司 Combined condensed steam heat exchange system for direct air cooling steam turbine
CN103245205B (en) * 2013-05-16 2014-12-03 国家电网公司 Combined condensed steam heat exchange system for direct air cooling steam turbine
CN103334802A (en) * 2013-06-26 2013-10-02 山东电力工程咨询院有限公司 Thermoelectric-coupling type comprehensive energy-utilizing system based on air-cooling device and working method
CN103334802B (en) * 2013-06-26 2015-05-27 山东电力工程咨询院有限公司 Thermoelectric-coupling type comprehensive energy-utilizing system based on air-cooling device and working method
CN104359223A (en) * 2014-11-28 2015-02-18 中国华能集团公司 System and method for using waste steam of steam turbine as thermal medium of air heater of power plant boiler
CN104359223B (en) * 2014-11-28 2015-09-09 中国华能集团公司 System and method using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium
CN105417609A (en) * 2015-12-07 2016-03-23 华北电力大学(保定) Method for adjusting dissolved gases in boiler feed water

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