CN102818252B - Regenerative system of power station single reheating set and power station - Google Patents
Regenerative system of power station single reheating set and power station Download PDFInfo
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- CN102818252B CN102818252B CN201210331097.5A CN201210331097A CN102818252B CN 102818252 B CN102818252 B CN 102818252B CN 201210331097 A CN201210331097 A CN 201210331097A CN 102818252 B CN102818252 B CN 102818252B
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Abstract
The invention provides a regenerative system of a power station single reheating set and a power station. The regenerative system comprises a condenser, a condensate pump, a low pressure heater, a medium pressure feed pump, a medium pressure heater, a high pressure feed pump, a high pressure heater, as well as mixing heaters, wherein the low pressure heater, the medium pressure feed pump and the high pressure heater are surface heaters; the regenerative system is provided with two mixing heater with different pressures, and one of the two mixing heaters has a deoxygenation function; and the medium pressure heater is arranged between the two mixing heaters, the medium pressure feed pump is arranged between the mixing heater with lower pressure and the medium pressure heater, and the high pressure feed pump is arranged between the mixing heater with higher pressure and the high pressure heater. The regenerative system provided by the invention can reduce the equipment manufacturing cost and simultaneously can improve the efficiency of a thermodynamic system.
Description
Technical field
The present invention relates to power station, be specifically related to the heat regenerative system of single reheat unit in power station.
Background technique
In prior art, steam turbine generally has 7 ~ 9 grades to draw gas, and is supplied to 7 ~ 9 heaters respectively, wherein only has a contact(-type) heater, this contact(-type) heater has deoxygenation function simultaneously, and therefore this heater is commonly referred to oxygen-eliminating device, and remaining heater is surface heater usually.Usually, the surface heater after condensate pump is called as low-pressure heater, and the surface heater after feed water pump is called as high-pressure heater.The hydrophobic of surface-type high-pressure heater is dredged usually step by step to the lower next stage of pressure.And the hydrophobic of surface-type low-pressure heater has following two profiles formula usually: (I) flows automatically pattern step by step, similar with the draining system of high-pressure heater, the hydrophobic of low-pressure heater at different levels is flow automatically to lower pressure step by step by elevated pressures, and hydrophobic final access vapour condenser, see Fig. 1; (II) drainage pump pattern is set, because the water side pressure of low-pressure heater is lower, arrange heater-drip pump so have ready conditions, i.e. the water side system of the hydrophobic access of the boosting by the low-pressure heater drainage pump low-pressure heater of low-pressure heater, typical low-pressure heater drainage pump system is shown in Fig. 2.
Along with the development of technology, the parameter of single reheat unit raises gradually, some shortcomings of above-mentioned heat regenerative system of the prior art appear gradually, be mainly reflected in these points: (one), raise gradually along with the main steam pressure of unit, the lift of pump that feeds water in system also raises gradually, thus the design pressure of high-pressure heater after making feed water pump also increases gradually.For extra-supercritical unit, the design pressure of high-pressure heater reaches 37 ~ 39MPa, considerably increases the initial outlay of heater device; (2) feed pressure, due to prior art mesohigh heater water side is higher, make high-pressure heater inconvenience configuration by hydrophobic for the vapour side drainage pump system be transported in feedwater, but flow automatically hydrophobic for the vapour side of high-pressure heater step by step, be finally discharged into oxygen-eliminating device, relative thermodynamic system efficiency is lower.
Summary of the invention
The object of this invention is to provide one and can reduce equipment manufacturing cost, improve the heat regenerative system of thermodynamic system efficiency simultaneously.
For achieving the above object, the invention provides the heat regenerative system of power station single reheat unit, described heat regenerative system comprises vapour condenser, condensate pump, low-pressure heater, middle pressure feed water pump, middle pressure heater, high pressure water pump, high-pressure heater and contact(-type) heater, described low-pressure heater, middle pressure heater and described high-pressure heater are surface heaters, it is characterized in that:
Described heat regenerative system is provided with the different contact(-type) heater of two pressure, and one in described two contact(-type) heaters has deoxygenation function;
Described middle pressure heater is arranged between described two contact(-type) heaters; And
Described middle pressure feed water pump is arranged between the lower contact(-type) heater of pressure and described middle pressure heater, and described high pressure water pump is arranged between the higher contact(-type) heater of pressure and described high-pressure heater.
In the present invention, water of condensation in described vapour condenser is boosted by described condensate pump, through described low-pressure heater, enter the contact(-type) heater that described pressure is lower, the water outlet of the contact(-type) heater that described pressure is lower is boosted, through described middle pressure heater by described middle pressure feed water pump, enter the contact(-type) heater that described pressure is higher, the water outlet of the contact(-type) heater that described pressure is higher is boosted by high pressure water pump, through described high-pressure heater, finally sends into boiler.
In a preferred embodiment of the present invention, described heat regenerative system comprises 3 described low-pressure heaters, 1 described middle pressure heater and 2 described high-pressure heaters.
In a preferred embodiment of the present invention, described heat regenerative system comprises 2 described low-pressure heaters, 2 described middle pressure heaters and 2 described high-pressure heaters.
In a preferred embodiment of the present invention, described heat regenerative system comprises 3 described low-pressure heaters, 2 described middle pressure heaters and 1 described high-pressure heater.
In a preferred embodiment of the present invention, described heat regenerative system comprises 3 described low-pressure heaters, 1 described middle pressure heater and 2 described high-pressure heaters.
In a preferred embodiment of the present invention, described heat regenerative system comprises 3 described low-pressure heaters, 2 described middle pressure heaters and 2 described high-pressure heaters.
In a preferred embodiment of the present invention, described heat regenerative system comprises 2 described low-pressure heaters, 3 described middle pressure heaters and 2 described high-pressure heaters.
In a preferred embodiment of the present invention, described heat regenerative system comprises 3 described low-pressure heaters, 1 described middle pressure heater and 3 described high-pressure heaters.
In a preferred embodiment of the present invention, described heat regenerative system comprises 2 described low-pressure heaters, 2 described middle pressure heaters and 3 described high-pressure heaters.
In the present invention, described middle pressure heater and the hydrophobic of described low-pressure heater adopt gravity flow pattern or employing step by step to arrange drainage pump pattern.
The present invention also provides a kind of power station, and described power station comprises single reheat unit, and wherein, the heat regenerative system of described single reheat unit is above-mentioned heat regenerative system.
The present invention, owing to being provided with two-stage contact(-type) heater, compared with prior art, has following three advantages:
(1) the present invention is owing to being provided with two-stage contact(-type) heater, and high-pressure heater of the prior art is divided into high-pressure heater and middle pressure heater, significantly reduces the design pressure of partial high pressure heater, thus can reduce engineering cost.
(2) the present invention compared with prior art, and the quantity of high-pressure heater is less, therefore has more heater to have ready conditions and arranges drainage pump system, can improve the cycle efficiency of system.
(3) contact(-type) heater number ratio prior art of the present invention is many, and the efficiency specific surface formula heater of contact(-type) heater is high, and therefore system effectiveness also will be higher.
Accompanying drawing explanation
Fig. 1 illustrates the typical heat regenerative system of single reheat unit in prior art;
Fig. 2 illustrates the another kind of typical heat regenerative system of single reheat unit in prior art;
Fig. 3 is the flow chart of the first embodiment of single reheat unit heat regenerative system of the present invention;
Fig. 4 is the flow chart of the second embodiment of single reheat unit heat regenerative system of the present invention;
Fig. 5 is the flow chart of the 3rd embodiment of single reheat unit heat regenerative system of the present invention; And
Fig. 6-10 is flow charts of multiple variant embodiment of single reheat unit heat regenerative system of the present invention.
Embodiment
Below with reference to accompanying drawing, preferred embodiment of the present invention is described in detail, so that clearer understanding objects, features and advantages of the present invention.It should be understood that embodiment shown in the drawings is not limitation of the scope of the invention, and the connotation just in order to technical solution of the present invention is described.
Below, major technique term of the present invention is described.
Single reheat unit: from boiler superheater main steam out after steam turbine high-pressure cylinder work done, send back in the reheater of boiler and heat to improve temperature, then sends into steam turbine mesolow cylinder and continues expansion working.
Heat regenerative system: utilize and did drawing gas of merit in steam turbine, come heat-setting water and feedwater by heater heat release of drawing gas, to improve the heating system entering boiler feed temperature.Single reheat unit heat regenerative system is a part for power station Turbo-generator Set circulation system.
Surface heater: heating steam with separated by metal wall by the water two media heated, in heat transfer process, two media is not in contact with each other, and heat passes to cold medium by thermal medium by metal wall.Unless otherwise indicated, all low-pressure heaters as herein described, middle pressure heater and high-pressure heater are surface heater.
Contact(-type) heater: heating steam with by the exchange heat of water two media heated be rely on both directly contact and mutually mix to realize, hot and cold two media while heat transmission, along with the mixing of quality.
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.
Fig. 1 illustrates the typical heat regenerative system of single reheat unit in prior art.As shown in Figure 1, in this system, steam turbine has 8 grades and draws gas, being supplied to 8 heaters, is high-pressure heater 11, high-pressure heater 10, high-pressure heater 9, oxygen-eliminating device 7, low-pressure heater 6, low-pressure heater 5, low-pressure heater 4 and low-pressure heater 3 respectively.Wherein, oxygen-eliminating device 7 is contact(-type) heaters, and all the other are surface heater.Water of condensation in vapour condenser 1 is boosted by condensate pump 2, after 4 grades of surface-type low-pressure heaters (3,4,5,6), enter oxygen-eliminating device 7, the feedwater after deoxygenation is boosted through feed water pump 8, through 3 grades of surface-type high-pressure heaters (9,10,11), final feeding boiler (not shown).
As shown in Figure 1, in existing heat regenerative system, the hydrophobic of high-pressure heater 11 accesses high-pressure heater 10 by gravity flow, the hydrophobic of high-pressure heater 10 accesses high-pressure heater 9 by gravity flow, the hydrophobic of high-pressure heater 9 accesses contact(-type) heater 7(and oxygen-eliminating device 7 by gravity flow is final) in, as shown in the dotted line below each high-pressure heater.In like manner, hydrophobic another grade of low-pressure heater that also cut-in pressure is lower by flowing automatically step by step of each low-pressure heater.
Because in low-pressure heater, feed pressure is lower, therefore in existing heat regenerative system, drainage pump system is set between low-pressure heater usually, to improve the cycle efficiency of system.Fig. 2 illustrates the one typical case drainage pump system be arranged between low-pressure heater.As shown in Figure 2, in this drainage pump system, low-pressure heater 6 is hydrophobic step by step from flowing to low-pressure heater 5, low-pressure heater 5 hydrophobic for arranging drainage pump pattern, namely low-pressure heater 5 is hydrophobic by booster pump 12(drainage pump 12) boosting be discharged into condensing water conduit between low-pressure heater 6 and low-pressure heater 5.Low-pressure heater 4 hydrophobic, flow to low-pressure heater 3 by gravity flow, low-pressure heater 3 hydrophobic, flow to vapour condenser 1 by gravity flow.
In above-mentioned existing heat regenerative system, the design pressure of the high-pressure heater after feed water pump is higher, and therefore corresponding cost is higher.And, because the feed pressure of high-pressure heater water side is higher, make high-pressure heater inconvenience configuration by hydrophobic for the vapour side drainage pump system be transported in feedwater, be unfavorable for the cycle efficiency of raising system.
For the problem of heat regenerative system in above-mentioned prior art, the present invention is based on thermodynamic cycle basic principle, the different contact(-type) heater of two pressure is set in single reheat unit heat regenerative system, arrange middle pressure feed water pump corresponding to the contact(-type) heater that pressure is lower, the contact(-type) heater higher corresponding to pressure arranges high pressure water pump.Thus, the pressure of partial high pressure heater can be reduced on the one hand, significantly reduce the cost of the feed piping (comprising pipeline, valve, pipe fitting etc.) before and after heater and heater.On the other hand for heater configuration drainage pump creates conditions.Further, by adopting contact(-type) heater, cold and hot fluid directly contacts conducts heat, and this heat transfer type avoids between heat transfer wall and the dirtiness resistance of both sides, and heat transfer efficiency is high, and simple structure little investment.
Fig. 3 is the flow chart of the first embodiment of single reheat unit heat regenerative system of the present invention.As shown in Figure 3, the water of condensation in vapour condenser 1 is boosted by condensate pump 2, after 3 grades of surface-type low-pressure heaters (3,4,5), enters first contact(-type) heater 15.Press feed water pump 13 to boost in feedwater warp after first contact(-type) heater 15 heats, after middle pressure heater 14, enter second contact(-type) heater 7(and can be used as oxygen-eliminating device 7).Feedwater after deoxygenation is boosted through high pressure water pump 8, through 2 grades of surface-type high-pressure heaters (10,11), and final feeding boiler (not shown).
Can find out by figure, prior art difference shown in the present embodiment and Fig. 1 is, prior art low-pressure heater (i.e. low-pressure heater 6) and a high-pressure heater (i.e. high-pressure heater 9) are replaced in one and has pressed heater (namely pressure heater 14) and a contact(-type) heater (i.e. first contact(-type) heater 15), and pressed feed water pump 13 in correspondingly increasing by one.Therefore, compare the prior art shown in Fig. 1, high-pressure heater quantity reduces, therefore more heater is had to have ready conditions to arrange drainage pump system (such as can middle pressure heater 14 place in figure 3 drainage pump system is set) to improve the cycle efficiency of heat regenerative system, and the required corresponding minimizing of high pressure pipe line system, significantly can reduce equipment investment thus.Such as, for the single reheat unit of a 1000MW, equipment investment about 5,000,000 yuan can be reduced.In addition, because the efficiency of heating surface of contact(-type) heater is high compared to heat exchange efficiency surface heater, be conducive to the whole efficiency of raising system, for 1000MW extra-supercritical unit, the heat consumption rate of steam turbine can be made to decline about 10 ~ 15kJ/kWh.
Fig. 4 illustrates the flow chart of the second embodiment according to single reheat unit heat regenerative system of the present invention.In the present embodiment, two of prior art low-pressure heaters (i.e. low-pressure heater 5,6) and a high-pressure heater (i.e. high-pressure heater 9) are replaced in two and has pressed heater (namely pressure heater 14,16) and a contact(-type) heater (i.e. first contact(-type) heater 15), and pressed feed water pump 13 in correspondingly increasing by one.
Water of condensation in vapour condenser 1 is boosted by condensate pump 2, after 2 grades of surface-type low-pressure heaters (3,4), enters first contact(-type) heater 15.Press feed water pump 13 to boost in feedwater warp after first contact(-type) heater 15 heats, after pressing heater (16,14) in two-stage, enter second contact(-type) heater 7(and can be used as oxygen-eliminating device 7).Feedwater after deoxygenation is boosted through high pressure water pump 8, through 2 grades of surface-type high-pressure heaters (10,11), and final feeding boiler (not shown).
Fig. 5 illustrates the flow chart of the 3rd embodiment according to single reheat unit heat regenerative system of the present invention.In the present embodiment, prior art low-pressure heater (i.e. low-pressure heater 6) and two high-pressure heaters (i.e. high-pressure heater 9,10) are replaced in two and has pressed heater (namely pressure heater 14,17) and a contact(-type) heater (i.e. first contact(-type) heater 15), and pressed feed water pump 13 in correspondingly increasing by one.
Water of condensation in vapour condenser 1 is boosted by condensate pump 2, after 3 grades of surface-type low-pressure heaters (3,4,5), enters first contact(-type) heater 15.Press feed water pump 13 to boost in feedwater warp after first contact(-type) heater 15 heats, after pressing heater (14,17) in two-stage, enter second contact(-type) heater 7(and can be used as oxygen-eliminating device 7).Feedwater after deoxygenation is boosted through high pressure water pump 8, through 1 grade of surface-type high-pressure heater 11, and final feeding boiler (not shown).
Fig. 6-10 illustrates other variant embodiment of the heat regenerative system according to single reheat unit of the present invention.As illustrated in figures 6-10, heat regenerative system of the present invention is also embodied as to arrange in suitable quantity between contact(-type) heater 15 and contact(-type) heater 7 presses heater (14,16,17,18,19,20), and correspondingly reduces the quantity of high-pressure heater and/or low-pressure heater.
Water of condensation in vapour condenser is boosted by condensate pump, through surface-type low-pressure heater, enter first contact(-type) heater that pressure is lower, the water outlet of this contact(-type) heater is boosted by middle pressure feed water pump, in surface-type, press heater, enter second contact(-type) heater that pressure ratio first contact(-type) heater is high, the water outlet of this second contact(-type) heater is boosted by high pressure water pump, through surface-type high-pressure heater, finally send into boiler.In two contact(-type) heaters, any one contact(-type) heater can have deoxygenation function as the oxygen-eliminating device in system.
And wherein the hydrophobic of any one surface heater adopts gravity flow pattern or employing step by step to arrange drainage pump pattern.
In addition, any one the had deoxygenation function of two contact(-type) heaters in each embodiment and as the oxygen-eliminating device in system.
Herein, low pressure, middle pressure and high pressure in low-pressure heater, middle pressure heater and high-pressure heater refer to the relative pressure of the relative present position in heat regenerative system, instead of the low pressure in absolute pressure meaning, middle pressure and high pressure.Such as, in the present invention, for 1000MW extra-supercritical unit, low-pressure heater refers to the heater of water side after condensate pump boosting, its water side pressure is generally 1 ~ 4MPa (g), middle pressure heater refer to water side through in press feed water pump boost after heater, its water side pressure is generally 3 ~ 7MPa (g), high-pressure heater refers to the heater of water side after high pressure water pump boosting, and its water side pressure is generally 30 ~ 40MPa (g).
Specifically, in the present invention, corresponding each contact(-type) heater all configures feed water pump, is called " middle pressure feed water pump " and " high pressure water pump " by relative pressure height.Accordingly, the surface heater after condensate pump is called as low-pressure heater; Surface heater after middle pressure feed water pump is called as middle pressure heater; Surface heater after high pressure water pump is called as high-pressure heater.
In addition, one skilled in the art should appreciate that, although not shown or only schematically show, but the constituent element of single reheat heat regenerative system of the present invention is except part described above, also comprise corresponding condensing water conduit system, middle pressure water supply piping system, high-pressure feed water pipe-line system and heater condensate pipe-line system (comprising drainage pump).
The present invention, owing to being provided with two-stage contact(-type) heater, compared with prior art, has following three advantages:
(1) the present invention is owing to being provided with two-stage contact(-type) heater, and high-pressure heater of the prior art is divided into high-pressure heater and middle pressure heater, significantly reduces the design pressure of partial high pressure heater, thus can reduce engineering cost.
(2) the present invention compared with prior art, and the quantity of high-pressure heater is less, therefore has more heater to have ready conditions and arranges drainage pump system, can improve the cycle efficiency of system.
(3) contact(-type) heater number ratio prior art of the present invention is many, and the efficiency specific surface formula heater of contact(-type) heater is high, and therefore system effectiveness also will be higher.
Single reheat heat regenerative system of the present invention can be applicable to high parameter Fossil Fueled Power Plant Project, particularly overcritical and ultra supercritical engineering, compared with existing single reheat heat regenerative system, significantly can reduce engineering cost, improves unit thermodynamic system efficiency.
Below described preferred embodiment of the present invention in detail, but it will be appreciated that, after having read above-mentioned instruction content of the present invention, those skilled in the art can make various changes or modifications the present invention.These equivalent form of values fall within the application's appended claims limited range equally.
Claims (9)
1. the heat regenerative system of power station single reheat unit, described heat regenerative system comprises vapour condenser, condensate pump, low-pressure heater, middle pressure feed water pump, middle pressure heater, high pressure water pump, high-pressure heater and contact(-type) heater, described low-pressure heater, middle pressure heater and described high-pressure heater are surface heaters, it is characterized in that:
Described heat regenerative system is provided with the different contact(-type) heater of two pressure, and one in described two contact(-type) heaters has deoxygenation function;
Described middle pressure heater is arranged between described two contact(-type) heaters; And
Described middle pressure feed water pump is arranged between the lower contact(-type) heater of pressure and described middle pressure heater, and described high pressure water pump is arranged between the higher contact(-type) heater of pressure and described high-pressure heater; Wherein
Water of condensation in described vapour condenser is boosted by described condensate pump, through described low-pressure heater, enter the contact(-type) heater that described pressure is lower, the water outlet of the contact(-type) heater that described pressure is lower is by described middle pressure feed water pump boosting, through described middle pressure heater, enter the contact(-type) heater that described pressure is higher, the water outlet of the contact(-type) heater that described pressure is higher is boosted by high pressure water pump, through described high-pressure heater, finally send into boiler.
2. heat regenerative system according to claim 1, is characterized in that: described heat regenerative system comprises 3 described low-pressure heaters, 1 described middle pressure heater and 2 described high-pressure heaters.
3. heat regenerative system according to claim 1, is characterized in that: described heat regenerative system comprises 2 described low-pressure heaters, 2 described middle pressure heaters and 2 described high-pressure heaters.
4. heat regenerative system according to claim 1, is characterized in that: described heat regenerative system comprises 3 described low-pressure heaters, 2 described middle pressure heaters and 1 or 2 described high-pressure heaters.
5. heat regenerative system according to claim 1, is characterized in that: described heat regenerative system comprises 2 described low-pressure heaters, 3 described middle pressure heaters and 2 described high-pressure heaters.
6. heat regenerative system according to claim 1, is characterized in that: described heat regenerative system comprises 3 described low-pressure heaters, 1 described middle pressure heater and 2 or 3 described high-pressure heaters.
7. heat regenerative system according to claim 1, is characterized in that: described heat regenerative system comprises 2 described low-pressure heaters, 2 described middle pressure heaters and 3 described high-pressure heaters.
8. the heat regenerative system according to any one of claim 1-7, is characterized in that: flow automatically step by step pattern or employing of the hydrophobic employing of described middle pressure heater and described low-pressure heater arranges drainage pump pattern.
9. a power station, described power station comprises single reheat unit, it is characterized in that: the heat regenerative system of described single reheat unit is the heat regenerative system according to any one of claim 1-7.
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| CN104537226B (en) * | 2014-12-19 | 2018-03-30 | 东南大学 | Backheat work done ratio and backheat ratio of profit increase assay method when reheating embrittlement has hydrophobic cold source energy |
| CN109404069B (en) * | 2018-12-13 | 2021-07-16 | 广东天安项目管理有限公司 | Steam turbine backheating system |
| CN113294216B (en) * | 2021-06-16 | 2024-03-12 | 东营市港城热力有限公司 | Subcritical once reheating deep back pressure unit process system for cogeneration |
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| CN101270675A (en) * | 2008-04-24 | 2008-09-24 | 华北电力大学 | Solar energy and coal-burning unit combined thermal power generation system |
| CN102116469A (en) * | 2009-12-30 | 2011-07-06 | 中国电力工程顾问集团华东电力设计院 | Water supply and drainage system for medium-pressure heater of power plant |
| CN202915338U (en) * | 2012-09-07 | 2013-05-01 | 中国电力工程顾问集团华东电力设计院 | Regenerative system and generator of power plant primary reheating unit |
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| WO2010086898A1 (en) * | 2009-01-30 | 2010-08-05 | 日立Ｇｅニュークリア・エナジー株式会社 | Electric power plant, and method for running the electric power plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270675A (en) * | 2008-04-24 | 2008-09-24 | 华北电力大学 | Solar energy and coal-burning unit combined thermal power generation system |
| CN102116469A (en) * | 2009-12-30 | 2011-07-06 | 中国电力工程顾问集团华东电力设计院 | Water supply and drainage system for medium-pressure heater of power plant |
| CN202915338U (en) * | 2012-09-07 | 2013-05-01 | 中国电力工程顾问集团华东电力设计院 | Regenerative system and generator of power plant primary reheating unit |
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