CN103836608B - Low pressure drain cooler heat regenerative system - Google Patents
Low pressure drain cooler heat regenerative system Download PDFInfo
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- CN103836608B CN103836608B CN201410085792.7A CN201410085792A CN103836608B CN 103836608 B CN103836608 B CN 103836608B CN 201410085792 A CN201410085792 A CN 201410085792A CN 103836608 B CN103836608 B CN 103836608B
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Abstract
The invention provides a kind of low pressure drain cooler heat regenerative system and generating set.This heat regenerative system make use of the hydrophobic heat of low-pressure heater, and by low pressure drain cooler system, the low-pressure heater that heated pressure is lower hydrophobic, hydrophobic by after heat vaporized, the steam of generation leads back to low-pressure heater.The present invention can solution lower than the problem of blocked drain between heater, reach indirect condensate water, reduce the amount of drawing gas, improve unit economy object.
Description
Technical field
The present invention relates to thermal power generation, be specifically related to the heat regenerative system in steam power plant.
Background technology
Now use in the heat regenerative system of steam turbine power generation factory, between adjacent two-stage low-pressure heater, especially last two-stage low-pressure heater 3-1 and 3-2 adopts hydrophobic mode of flowing automatically step by step, hydrophobic heating main condensate is utilized in the hydrophobic cooling section of secondary final stage low-pressure heater 3-2, as shown in Figure 1, thus recovery heat, reach the object improving unit heat economy.
But, the much subcritical and supercritical unit of domestic current operation, there is the problem of blocked drain (mainly because the pressure reduction between this two-stage low-pressure heater is too small more in end two-stage low-pressure heater, this pressure reduction is caused to be not enough to overcome the resistance of drain water piping and respective valves), many units run or the underrun stage normal, all need to open emergency drain valve for a long time, cause thermal loss, reduce unit economy.
Summary of the invention
The object of the invention is by adopting the low pressure drain cooler heat regenerative system that pressure is relatively low, while raising thermodynamic system efficiency, reduce the cost of equipment and piping, and do not increase the operate power of condensate pump, increase return on investment, expand the range of application of energy conservation.
For achieving the above object, the invention provides a kind of low pressure drain cooler heat regenerative system, described heat regenerative system comprises condenser, oxygen-eliminating device and multistage low-pressure heater, it is characterized in that, described heat regenerative system also comprises low pressure drain cooler, wherein
The hydrophobic entrance of high temperature of described low pressure drain cooler is connected with hydrophobic outlet of certain one-level low-pressure heater via pipeline, the hydrophobic low-pressure heater entering described condenser or another stage pressure Temperature Matching after described low pressure drain cooler cooling of certain one-level low-pressure heater described;
A hydrophobic part for the next stage low-pressure heater of certain one-level low-pressure heater described is communicated with the hydrophobic inlet fluid of low temperature of described low pressure drain cooler, after heat vaporized via described low pressure drain cooler, enter this next stage low-pressure heater, for heat-setting water, hydrophobic another part of the next stage low-pressure heater of certain one-level low-pressure heater described is from flowing to next stage low-pressure heater or condenser again.
Preferably, the pipeline between the hydrophobic entrance of high temperature of described low pressure drain cooler and the hydrophobic outlet of certain one-level low-pressure heater described does not arrange valve.
Preferably, certain one-level low-pressure heater described is the secondary final stage low-pressure heater of described heat regenerative system, and the next stage low-pressure heater of certain one-level low-pressure heater described is the final stage low-pressure heater of described heat regenerative system.
Preferably, a hydrophobic part for described final stage low-pressure heater is communicated to described condenser via pipeline and drain valve, and hydrophobic another part of described final stage low-pressure heater is communicated to the hydrophobic entrance of low temperature of described low pressure drain cooler via another pipeline and another drain valve.
Preferably, described drain cooler be arranged on there is blocked drain two-stage low-pressure heater between.
Preferably, the operating pressure of described low-pressure heater is lower than 0.2MPa (a).
Preferably, the operating pressure of described low pressure drain cooler is lower than 0.2MPa (a).
Preferably, the position of described low pressure drain cooler is lower than the position of described low-pressure heater.
Present invention also offers a kind of generating set, this generating set comprises above-mentioned low pressure drain cooler heat regenerative system.
Preferably, described generating set is subcritical generating set, supercritical generating sets or ultra supercritical unit.
Draining system of the present invention make use of the hydrophobic heat of low-pressure heater, by low pressure drain cooler system, the low-pressure heater that heated pressure is lower hydrophobic, hydrophobic by after heat vaporized, the steam produced leads back to low-pressure heater, reaches indirect condensate water, reduces the amount of drawing gas, improves unit economy object.
Accompanying drawing explanation
Fig. 1 is the system diagram of existing hydrophobic heat regenerative system of flowing automatically step by step;
Fig. 2 is the system flow chart of the low pressure drain cooler heat regenerative system according to the first embodiment of the present invention; And
Fig. 3 is the system flow chart of low pressure drain cooler heat regenerative system according to a second embodiment of the present invention.
Detailed description of the invention
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.
Herein, " upper level low-pressure heater ", " next stage low-pressure heater " refer in heat regenerative system, along the flow direction of condensate water, compared to certain one-level low-pressure heater, be called " next stage low-pressure heater " at the one-level low-pressure heater closer to condenser position, be called " upper level low-pressure heater " at the one-level low-pressure heater further from condenser position.
Terminological interpretation
Drain cooler: before hydrophobic inflow next stage low-pressure heater or condenser, first through surface-type heat exchanger, enter next stage low-pressure heater or condenser with main condensate again by after hydrophobic suitable cooling, this surface-type heat exchanger is referred to as drain cooler.Herein, the operating pressure of drain cooler between 0.02MPa (a) to 0.2MPa (a), therefore also known as low pressure drain cooler.
Low-pressure heater: low-pressure heater herein refers to the surface heater of rated pressure between 0.015MPa (a) to 0.2MPa (a).Herein, low-pressure heater can be single-row, also can be biserial.In extra-supercritical unit, refer generally to the surface heater of rated pressure between 0.015MPa (a) to 0.2MPa (a).In supercritical unit, refer generally to the surface heater of rated pressure between 0.015MPa (a) to 0.15MPa (a).In other units, refer generally to the surface heater of rated pressure between 0.015MPa (a) to 0.1MPa (a).
Fig. 2 illustrates the system flow chart of the low pressure drain cooler heat regenerative system 101 according to the first embodiment of the present invention.Low pressure drain cooler heat regenerative system 101 of the present invention is parts of turbine generator circulation system.As shown in Figure 2, low pressure drain cooler heat regenerative system 101 comprises drain cooler 6, multiple low-pressure heater 3-1,3-2 and 3-3, steam piping, hydrophobic piping, hydrophobic valve 5, oxygen-eliminating device 4 and condenser 1 and condensate pump 2.For the sake of clarity, 3 low-pressure heaters are only shown in figure, but those of ordinary skill in the art will understand, the quantity of low-pressure heater is not limited to 3, but can arrange the low-pressure heater of specific quantity as required.
With in prior art by secondary final stage low-pressure heater 3-2 hydrophobic from flow to final stage low-pressure heater 3-1 unlike, in the present embodiment, high temperature hydrophobic entrance 61 fluid of the hydrophobic and drain cooler 6 of secondary final stage low-pressure heater 3-2 is communicated with, and after drain cooler 6, enters condenser 1.The hydrophobic outlet of final stage low-pressure heater 3-1 is divided into two-way, and a road is communicated to condenser 1 via pipeline and drain valve 5.Another road is communicated with the low temperature of drain cooler 6 hydrophobic entrance 62 fluid with another drain valve 5 via another pipeline, after heat vaporized via drain cooler 6, gets back to final stage low-pressure heater 3-1, for heat-setting water via steam (vapor) outlet 63 and corresponding pipeline.The ratio of the flow between the two-way of final stage low-pressure heater is hydrophobic can be arranged according to the thermal balance of system.
That is, secondary final stage low-pressure heater 3-2 hydrophobic can enter drain cooler 6 and to heat a part of final stage low-pressure heater 3-1 hydrophobic.The part hydrophobic of final stage low-pressure heater 3-1 enters drain cooler 6, and after heat vaporized, the steam of generation leads back top heater 3-1, heat-setting water.
In above-mentioned low pressure drain cooler heat regenerative system, in drain cooler 6, heated medium is the hydrophobic of low-pressure heater 3-1, pressure is lower, and such as, to extra-supercritical unit common at present, the hydrophobic rated operating pressures of final stage low-pressure heater is about 0.02MPa(a).Lower pressure greatly reduces the cost of drain cooler 6 equipment and piping (comprising pipeline, pipe fitting, valve etc.), increases return on investment.
In addition, because low pressure drain cooler 6 adopts low position, differential static pressure between itself and secondary final stage low-pressure heater 3-2 is about 0.1MPa, pressure reduction is larger, and secondary final stage low-pressure heater 3-2 to the pipeline of low pressure drain cooler 6 does not exist the corresponding flow resistance of such as drain valve, drain cooler 6 can be flow to swimmingly because of this final stage low-pressure heater 3-2 hydrophobic and the problem of blocked drain can not be there is.
Fig. 3 illustrates the system flow chart of low pressure drain cooler heat regenerative system 102 according to a second embodiment of the present invention.System 102 shown in Fig. 3 is similar to the system 101 shown in Fig. 2, difference is in Fig. 3, the low-pressure heater of certain one-level intergrade is hydrophobic passes through drain cooler, heat the hydrophobic of the low-pressure heater of this intergrade next stage, for solving the blocked drain problem between certain two-stage intergrade low-pressure heater.
In the present embodiment, the hydrophobic outlet of certain one-level intergrade low-pressure heater 3n is communicated with the hydrophobic inlet fluid of drain cooler 6, after drain cooler 6, enters the low-pressure heater of condenser 1 or certain first class pressure Temperature Matching.The hydrophobic of this intergrade next stage low-pressure heater 3n-1 is divided into two-way, and a road is communicated to next stage low-pressure heater 3n-2 again via pipeline and drain valve 5.Another road is communicated with drain cooler 6 fluid with another drain valve 5 via another pipeline, after heat vaporized via drain cooler 6, gets back to this intergrade next stage low-pressure heater 3n-1, for heat-setting water.
This embodiment is especially favourable for the Transformation of Unit of blocked drain between certain two-stage low-pressure heater, according to extraction pressure, can set up drain cooler after the low-pressure heater of blocked drain, thus solves blocked drain.
It is pointed out that for the sake of clarity, 4 low-pressure heaters are only shown in figure, but those of ordinary skill in the art will understand, the quantity of low-pressure heater is not limited to 4, but can arrange the low-pressure heater of specific quantity as required.In addition, although only illustrate a drain cooler system in figure, as required, also multiple drain cooler system can be set, for solving the blocked drain problem between multiple low-pressure heater.
Low pressure drain cooler heat regenerative system tool of the present invention has the following advantages:
1., in system configuration of the present invention, in drain cooler, heated medium is the hydrophobic of low-pressure heater, and pressure is lower.Such as to ultra supercritical unit common at present, the hydrophobic rated operating pressures of final stage low-pressure heater is about 0.02MPa (a), lower pressure greatly reduces the cost of drain cooler equipment and piping (comprising pipeline, pipe fitting, valve etc.), increases return on investment.
2. equipment investment is little, and earning rate is high, and such as, to 1 1000MW ultra supercritical thermal power generation unit, the equipment of low pressure drain cooler system and piping investment can drop to about 1,000,000 yuan.
3. low pressure drain cooler system does not have corresponding flow resistance, flow smooth and easy, efficiency is high, does not increase the operate power of condensate pump.
4. drain cooler adopts the hydrophobic as cooling medium of low discharge, and contour size of the unit(s) is little, piping is less, and floor space is little, for the technological transformation project that place is limited creates strong condition.
5. applicability is good, is not only applicable to newly-built Fossil Fueled Power Plant Project, especially has better applicability to the energy-conservation technological transformation of the unit that puts into operation, is also particularly useful for high parameter Fossil Fueled Power Plant Project.
6. can by a hydrophobic part for its next stage low-pressure heater of hydrophobic heating of certain grade of low-pressure heater, this next stage low-pressure heater hydrophobic by after heat vaporized, can heat-setting water, improves heat regenerative system efficiency thus.
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 (10)
1. a low pressure drain cooler heat regenerative system, described heat regenerative system comprises condenser, oxygen-eliminating device and multistage low-pressure heater, it is characterized in that, described heat regenerative system also comprises low pressure drain cooler, wherein
The hydrophobic entrance of high temperature of described low pressure drain cooler is connected with hydrophobic outlet of certain one-level low-pressure heater via pipeline, the hydrophobic low-pressure heater entering described condenser or another stage pressure Temperature Matching after described low pressure drain cooler cooling of certain one-level low-pressure heater described;
A hydrophobic part for the next stage low-pressure heater of certain one-level low-pressure heater described is communicated with the hydrophobic inlet fluid of low temperature of described low pressure drain cooler, after heat vaporized via described low pressure drain cooler, enter this next stage low-pressure heater, for heat-setting water, hydrophobic another part of the next stage low-pressure heater of certain one-level low-pressure heater described is from flowing to next stage low-pressure heater or condenser again.
2. low pressure drain cooler heat regenerative system according to claim 1, is characterized in that, the pipeline between the hydrophobic entrance of high temperature of described low pressure drain cooler and the hydrophobic outlet of certain one-level low-pressure heater described does not arrange valve.
3. low pressure drain cooler heat regenerative system according to claim 1, it is characterized in that, certain one-level low-pressure heater described is the secondary final stage low-pressure heater of described heat regenerative system, and the next stage low-pressure heater of certain one-level low-pressure heater described is the final stage low-pressure heater of described heat regenerative system.
4. low pressure drain cooler heat regenerative system according to claim 3, it is characterized in that, a hydrophobic part for described final stage low-pressure heater is communicated to described condenser via pipeline and drain valve, and hydrophobic another part of described final stage low-pressure heater is communicated to the hydrophobic entrance of low temperature of described low pressure drain cooler via another pipeline and another drain valve.
5. low pressure drain cooler heat regenerative system according to claim 1, is characterized in that, described drain cooler be arranged on there is blocked drain two-stage low-pressure heater between.
6. low pressure drain cooler heat regenerative system according to claim 1, it is characterized in that, the operating pressure of described low-pressure heater is lower than 0.2MPa (a).
7. low pressure drain cooler heat regenerative system according to claim 1, is characterized in that, the operating pressure of described low pressure drain cooler is lower than 0.2MPa (a).
8. low pressure drain cooler heat regenerative system according to claim 1, is characterized in that, the position of described low pressure drain cooler is lower than the position of described low-pressure heater.
9. a generating set, is characterized in that, described generating set comprises the low pressure drain cooler heat regenerative system described in any one of claim 1-8.
10. generating set according to claim 9, is characterized in that, described generating set is subcritical generating set, supercritical generating sets or ultra supercritical unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410085792.7A CN103836608B (en) | 2014-03-10 | 2014-03-10 | Low pressure drain cooler heat regenerative system |
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| CN201410085792.7A CN103836608B (en) | 2014-03-10 | 2014-03-10 | Low pressure drain cooler heat regenerative system |
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| CN103836608B true CN103836608B (en) | 2016-03-23 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782946B (en) * | 2016-05-09 | 2018-10-23 | 中国能源建设集团广东省电力设计研究院有限公司 | Vertical HP heater drainage system |
| CN107062351B (en) * | 2017-05-08 | 2022-09-30 | 华电电力科学研究院有限公司 | Heat supply network graded heating system utilizing small steam turbine and adjusting method thereof |
| CN110594722A (en) * | 2018-06-12 | 2019-12-20 | 中国电力工程顾问集团华东电力设计院有限公司 | Drainage control system and method for low-pressure drainage cooler heat regeneration system |
| CN109520001A (en) * | 2018-12-12 | 2019-03-26 | 沧州华润热电有限公司 | A kind of heat supply network draining system |
| CN111023077A (en) * | 2019-12-23 | 2020-04-17 | 东方电气集团东方汽轮机有限公司 | Drainage system with external cooler for low-pressure heater and control method |
| CN114076303A (en) * | 2021-10-20 | 2022-02-22 | 华电电力科学研究院有限公司 | System and method for heating condensed water of main engine by using waste heat of steam condensed water externally supplied by industrial heat supply |
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| JPH06300215A (en) * | 1993-04-09 | 1994-10-28 | Mitsubishi Heavy Ind Ltd | Steam plant |
| JPH11101403A (en) * | 1997-07-30 | 1999-04-13 | Toshiba Corp | Heating system of feed water of power plant |
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