CN101650022A - Steam turbine interstage back-heating heater cross-class connecting system - Google Patents
Steam turbine interstage back-heating heater cross-class connecting system Download PDFInfo
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- CN101650022A CN101650022A CN200910194414A CN200910194414A CN101650022A CN 101650022 A CN101650022 A CN 101650022A CN 200910194414 A CN200910194414 A CN 200910194414A CN 200910194414 A CN200910194414 A CN 200910194414A CN 101650022 A CN101650022 A CN 101650022A
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Abstract
The invention relates to a steam turbine interstage back-heating heater cross-class connecting system. The back-heating system adopting steam extraction heating water supply is provided with a steam turbine interstage heater for fully exerting back-heating effect, reducing cold source loss and improving the thermal economy of a unit, and tasks of utilizing steam turbine low voltage back-heating extraction in a cross class and heating boiler supply water and main condensed water are finished by a steam ejector. The thermodynamic perfection of the back-heating circulation of a main machine is further improved due to the change of a connecting way of the interstage heater, thereby directly improving the thermal economy of the back-heating system of the main machine.
Description
Technical field
The present invention relates to thermal power plant Steam Turbine Regenerative System in a kind of Thermal Power Engineering, particularly a kind of steam turbine interstage back-heating heater cross-class connecting system.
Background technology
The technical measures of exploring and develop the energy-saving and emission-reduction of thermal power generation unit are significant.With a 1200MW power plant (2 * 600MW unit) is example, need consume nearly ten thousand tons of coals every day, if this factory's supply standard coa consumption rate reduces 1g/kWh, by 5000 hours average annual running times of unit, can save 6000 tons of standard coals the whole year, if by marking 500 yuan of calculating of coal price lattice on year-on-year basis, only fuel cost is one, can save every year more than 3,000,000 yuan, also can reduce a large amount of greenhouse gases (CO simultaneously
2) and pollutant (SO
x, NO
x, Hg, dust etc.) discharging.
Generation current enterprise more needs to improve the operation heat-economy in the face of financial crisis, coal price go up and hour following degradation problem of utilization, improves therrmodynamic system, and development of latent energy-saving potential reduces cost of electricity-generating.
Summary of the invention
The present invention be directed to the thermal power generation unit and need the problem of energy-saving and emission-reduction, a kind of steam turbine interstage back-heating heater cross-class connecting system has been proposed, by heater between stage is set, and finish by steam jet ejector and to stride level and utilize the steam turbine low-pressure regenerative steam, the task of heating boiler feedwater and main condensate.
The draw gas heat regenerative system of heated feed water of employing can reduce cold source energy, improve the heat-economy of unit, its principle is to utilize the part steam of making merit in the steam turbine, from some intergrades importing bleeder heater of releasing, heating boiler feedwater and main condensate no longer enter condenser.The heat content that draws gas of this part just has been fully utilized, and does not take away and be not cooled, and adopts back heating system in addition, owing to improved feed temperature, can reduce the thermal stress that boiler heating surface produces because of heat transfer temperature difference is excessive, thereby improve the reliability of equipment.
Technical scheme of the present invention is: a kind of steam turbine interstage back-heating heater cross-class connecting system, system comprises boiler, steam turbine, generator, condenser, condensate pump, low-pressure heater, oxygen-eliminating device, high-pressure heater, steam jet ejector, hydrophobic isolating valve, boiler produces primary steam and enters the steam turbine first cylinder work done, the indirect steam of the first cylinder steam discharge after boiler is warm again enters the steam turbine second cylinder work done, work done enters condenser later on, finish the conversion of heat energy and mechanical energy, steam turbine and generator carry out the conversion of mechanical energy and electric energy, after the condensate water of described turbine discharge is boosted by condensate pump, enter first low-pressure heater successively, second low-pressure heater, the 3rd low-pressure heater absorbs heat, then enter the oxygen-eliminating device deoxygenation, after boosting, the feedwater of deoxygenation water tank is sent to first high-pressure heater successively, second high-pressure heater and final stage high-pressure heater absorb heat, get back in the boiler at last; Second high-pressure heater and oxygen-eliminating device high-pressure steam source come from steam turbine first cylinder, the hydrophobic oxygen-eliminating device that passes back into of second high-pressure heater, first, second low-pressure heater low pressure vapour source comes from steam turbine second cylinder, hydrophobic first low-pressure heater that passes back into of second low-pressure heater, the hydrophobic condenser that passes back into of first low-pressure heater; The first steam jet ejector high-pressure steam source comes from the boiler initial steam, low pressure vapour source comes from second low-pressure heater and draws gas, after mixed vapour in first steam jet ejector enters the final stage high-pressure heater feedwater is heated, enter the oxygen-eliminating device heated feed water through the first hydrophobic isolating valve; The second steam jet ejector high-pressure steam source comes from second high-pressure heater and draws gas, low pressure vapour source comes from second low-pressure heater and draws gas, after mixed vapour enters first high-pressure heater feedwater is heated in second steam jet ejector, through the second hydrophobic isolating valve step by step from flowing to oxygen-eliminating device; The 3rd steam jet ejector high-pressure steam source comes from oxygen-eliminating device and draws gas, low pressure vapour source comes from first low-pressure heater and draws gas, after mixed vapour enters the 3rd high-low pressure heater feedwater is heated in the 3rd steam jet ejector, through the 3rd hydrophobic isolating valve step by step from flowing to second low-pressure heater.
Described first steam jet ejector high-pressure steam source and low pressure vapour source input are equipped with isolating valve respectively; The second steam jet ejector high-pressure steam source and low pressure vapour source input are equipped with isolating valve respectively; The 3rd steam jet ejector high-pressure steam source and low pressure vapour source input are equipped with isolating valve respectively.
After described final stage high-pressure heater water source input/output port connects the heater isolating valve respectively, and connect two bypass valves; After the described first high-pressure heater water source input/output port connects the heater isolating valve respectively, and connect two bypass valves; After described the 3rd low-pressure heater water source input/output port connects the heater isolating valve respectively, and connect two bypass valves.
The steam outlet of described boiler has non-return valve, and two high steam delivery outlets of steam turbine first cylinder have non-return valve respectively, and two low-pressure steam delivery outlets of steam turbine second cylinder have non-return valve respectively.
Described steam jet ejector is the pattern of one with the bleeder heater of corresponding connection.
Beneficial effect of the present invention is: heater cross level connected system between stage of the present invention, when obtaining to have a net increase of generated output, because the change of connected mode, the thermodynamics integrity of main frame backheat circulation improves, and directly improves main frame heat regenerative system heat-economy.The cycle fluid of this fired power generating unit still imports the backheat circulation, does not increase the task of host computer system amount of makeup water.
Description of drawings
Fig. 1 is heater cross level connected system structural representation between stage of the present invention.
The specific embodiment
Heater cross level connected system structural representation between stage as shown in Figure 1, system comprises boiler 1, steam turbine 2,3, generator 4, condenser 5, condensate pump 6, low- pressure heater 7,8,9, oxygen-eliminating device 10, high- pressure heater 11,12,13, steam jet ejector 14,15,16, isolating valve 17,18,24,25,31,32, hydrophobic isolating valve are 19,26,33, and bypass valve is 20,21,27,28,34,35, heater isolating valve 22,23,29,30,36,37, non-return valve 38,39,40,41,42.
The boiler 1 of a resuperheat of steam of a fired power generating unit, produce primary steam and enter steam turbine 2 works done, the indirect steam of high pressure cylinder steam discharge after boiler is warm again enters steam turbine 3 works done, work done enters condenser 5 later on, finish the conversion of heat energy and mechanical energy, finish the conversion of mechanical energy and electric energy then by generator 4.After the condensate water of turbine discharge is boosted by condensate pump 6, enter low-pressure heater 7, low-pressure heater 8, low-pressure heater 9 absorption heats successively, then enter oxygen-eliminating device 10 deoxygenations, be sent to high-pressure heater 11, high-pressure heater 12 and final stage high-pressure heater 13 after the feedwater of deoxygenation water tank is boosted successively and absorb heat,, finish the working medium circulation after the boiler feedwater operating desk enters boiler 1.
As can be seen from Figure 1, at different levels the drawing gas from steam turbine enters the heat release of corresponding high and low pressure heater at different levels respectively and condenses into hydrophobic.
According to device shown in Figure 1 the isolating valve valve is housed also, with steam jet ejector 14, heater 13 is example, steam jet ejector 14 vapour source ends have isolating valve 17,18, heater 13 hydrophobic isolating valves are 19, the bypass valve of heater 13 is 20,21, heater isolating valve 22,23 is so that operation the time is switched flexibly.High-pressure heater 13 water sides have automatic protection bypath system, utilize the water supply of heater isolating valve 22,23 cutoff high heaters when situation occurring, open the bypass valve bypass simultaneously and realize supplying water incessantly.
When preventing the unexpected removal of load of unit, the steam turbine internal pressure reduces suddenly, and the steam in each heater or the extraction line flows backwards and enters steam turbine and cause hypervelocity; And when preventing that the heater piping from leaking, water enters from extraction line the water slug accident takes place in the steam turbine, on the extracted steam from turbine pipeline, all be equipped with can quick closedown non-return valve, also be the vapour side protection of heater.
System is connected method and system with heater cross level between fired power generating unit backheat circulation and stage and joins together, and forms novel connected mode.Heater is set and heater and corresponding steam jet ejector and annex is set at oxygen-eliminating device to the inter-stage of each high-pressure heater of the water supply system between the boiler economizer and form new thermodynamic system of steam tur at condenser to the inter-stage of each low-pressure heater of the condensate system between the oxygen-eliminating device.
The vapour source of described inter-stage heater is from the mixed vapour of corresponding steam jet ejector outlet, the driving steam source of steam jet ejector comes from the regenerative steam of initial steam or certain inter-stage upstream, by the jetting steam caused steam turbine regenerative steam of the lower one-level of this inter-stage or certain grade of low-pressure pumping steam of appointment of coming from.
The hydrophobic employing of the described inter-stage bleeder heater mode of flowing automatically step by step.Steam discharge (hydrophobic) employing of the inter-stage bleeder heater between boiler economizer and the high-pressure heater is striden level and is connected to downstream bleeder heater (or oxygen-eliminating device).
All inter-stage bleeder heaters adopt changeable mode to insert Steam Turbine Regenerative System, and the vapour side of steam jet ejector is provided with that isolating valve, inter-stage bleeder heater hydrophobic (steam discharge) side are provided with isolating valve, feedwater (condensate water) side is little bypass connected mode.The vapour source of steam jet ejector all connects the downstream from corresponding regenerative steam pipeline non-return valve.Install non-return valve additional on the steam source pipe road of the inter-stage steam jet ejector between economizer and the high-pressure heater.
Described steam jet ejector and inter-stage bleeder heater comprise the pattern that both become one, and the compact Heater group that makes up with former heat regenerative system heater.
The heater cross level connects method and system when obtaining to have a net increase of generated output between described stage, because the change of connected mode, the thermodynamics integrity of main frame backheat circulation improves, and directly improves main frame heat regenerative system heat-economy.The cycle fluid of this fired power generating unit still imports the backheat circulation, does not increase the task of host computer system amount of makeup water.
Claims (5)
1, a kind of steam turbine interstage back-heating heater cross-class connecting system, system comprises boiler (1), steam turbine (2,3), generator (4), condenser (5), condensate pump (6), low-pressure heater (7,8,9), oxygen-eliminating device (10), high-pressure heater (11,12,13), steam jet ejector (14,15,16), hydrophobic isolating valve (19,26,33), boiler (1) produces primary steam and enters steam turbine first cylinder (2) work done, the indirect steam of first cylinder (2) steam discharge after boiler is warm again enters steam turbine second cylinder (3) work done, work done enters condenser (5) later on, finish the conversion of heat energy and mechanical energy, steam turbine and generator (4) carry out the conversion of mechanical energy and electric energy, it is characterized in that, after the condensate water of described turbine discharge is boosted by condensate pump (6), enter first low-pressure heater (7) successively, second low-pressure heater (8), the 3rd low-pressure heater (9) absorbs heat, then enter oxygen-eliminating device (10) deoxygenation, after boosting, the feedwater of deoxygenation water tank is sent to first high-pressure heater (11) successively, second high-pressure heater (12) and final stage high-pressure heater (13) absorb heat, get back at last in the boiler (1); Second high-pressure heater (12) and oxygen-eliminating device (10) high-pressure steam source come from steam turbine first cylinder (2), the hydrophobic oxygen-eliminating device (10) that passes back into of second high-pressure heater (12), first, second low-pressure heater (7,8) low pressure vapour source comes from steam turbine second cylinder (3), hydrophobic first low-pressure heater (7) that passes back into of second low-pressure heater (8), the hydrophobic condenser (5) that passes back into of first low-pressure heater (7); First steam jet ejector (14) high-pressure steam source comes from boiler (1) initial steam, low pressure vapour source comes from second low-pressure heater (8) that the later first order of resuperheat bleeds and draws gas, after mixed vapour in first steam jet ejector (14) enters final stage high-pressure heater (13) feedwater is heated, enter oxygen-eliminating device (10) heated feed water through the first hydrophobic isolating valve (19); Second steam jet ejector (15) high-pressure steam source comes from second high-pressure heater (12) and draws gas, low pressure vapour source comes from second low-pressure heater (8) and draws gas, after mixed vapour enters first high-pressure heater (11) feedwater is heated in second steam jet ejector (15), through the second hydrophobic isolating valve (26) step by step from flowing to oxygen-eliminating device (10); The 3rd steam jet ejector (16) high-pressure steam source comes from oxygen-eliminating device (10) and draws gas, low pressure vapour source comes from first low-pressure heater (7) and draws gas, after mixed vapour enters the 3rd low-pressure heater (9) feedwater is heated in the 3rd steam jet ejector (16), through the 3rd hydrophobic isolating valve (33) step by step from flowing to second low-pressure heater (8).
2, steam turbine interstage back-heating heater cross-class connecting system according to claim 1 is characterized in that, described first steam jet ejector (14) high-pressure steam source and low pressure vapour source input are equipped with isolating valve (17,18) respectively; Second steam jet ejector (15) high-pressure steam source and low pressure vapour source input are equipped with isolating valve (24,25) respectively; The 3rd steam jet ejector (16) high-pressure steam source and low pressure vapour source input are equipped with isolating valve (31,32) respectively.
3, steam turbine interstage back-heating heater cross-class connecting system according to claim 1, it is characterized in that, after described final stage high-pressure heater (13) feedwater input/output port connects heater isolating valve (22,23) respectively, and connect two bypass valves (20,21); After described first high-pressure heater (11) feedwater input/output port connects heater isolating valve (29,30) respectively, and connect two bypass valves (27,28); After described the 3rd low-pressure heater (9) condensate water input/output port connects heater isolating valve (36,37) respectively, and connect two bypass valves (34,35).
4, steam turbine interstage back-heating heater cross-class connecting system according to claim 1, it is characterized in that, the steam outlet of described boiler (1) has non-return valve (38), (2) two high steam delivery outlets of steam turbine first cylinder have non-return valve (39,40) respectively, and (3) two low-pressure steam delivery outlets of steam turbine second cylinder have non-return valve (41,42) respectively.
5, steam turbine interstage back-heating heater cross-class connecting system according to claim 1 is characterized in that, described steam jet ejector is the pattern of one with the bleeder heater of corresponding connection.
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| CN2009101944141A CN101650022B (en) | 2009-08-21 | 2009-08-21 | Steam turbine interstage back-heating heater cross-class connecting system |
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| CN2009101944141A CN101650022B (en) | 2009-08-21 | 2009-08-21 | Steam turbine interstage back-heating heater cross-class connecting system |
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| CN112303604A (en) * | 2020-10-29 | 2021-02-02 | 西安热工研究院有限公司 | Economizer temperature governing system that unit start-up process denitration was put into |
| CN112455642A (en) * | 2020-10-29 | 2021-03-09 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Condensate water supercharging device and condensate water system based on steam injection |
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| CN114718916B (en) * | 2022-04-24 | 2023-08-04 | 郭兴军 | Energy-saving gas heating system for supplying steam by using steam injector |
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