CN103836608A - Regenerative system of low-pressure drain water cooler - Google Patents
Regenerative system of low-pressure drain water cooler Download PDFInfo
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- CN103836608A CN103836608A CN201410085792.7A CN201410085792A CN103836608A CN 103836608 A CN103836608 A CN 103836608A CN 201410085792 A CN201410085792 A CN 201410085792A CN 103836608 A CN103836608 A CN 103836608A
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Abstract
The invention provides a regenerative system of a low-pressure drain water cooler and a generator set. Low-pressure drain water in a low-pressure heater is heated through a low-pressure drain water cooler system by the aid of heat of the drain water in the low-pressure heater, and vapor generated after the drain water is vaporized by heating is guided back to the low-pressure heater. The problem of unsmooth drain water of the low-pressure heater can be solved, and indirect heating of condensation water, reduction of vapor extraction capacity and improvement of unit economy are achieved.
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 adopt the hydrophobic mode of flowing automatically step by step, in the hydrophobic cooling section of inferior final stage low-pressure heater 3-2, utilize hydrophobic heating main condensate, as shown in Figure 1, thereby recovery heat, reaches the object that improves unit heat economy.
But, the a lot of subcritical and supercritical unit of domestic current operation, it (is mainly because the pressure reduction between this two-stage low-pressure heater is too small that end two-stage low-pressure heater exists the problem of blocked drain more, cause this pressure reduction to be not enough to overcome the resistance of drain water piping and respective valves), many units are in normal operation or underrun stage, all need to open for a long time emergency drain valve, caused thermal loss, reduced unit economy.
Summary of the invention
The object of the invention is by adopting the relatively low low pressure drain cooler heat regenerative system of pressure, improving in thermodynamic system efficiency, the cost of reduction 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 the hydrophobic outlet of certain one-level low-pressure heater via pipeline, the hydrophobic low-pressure heater that enters described condenser or another stage pressure Temperature Matching after described low pressure drain cooler is cooling of described certain one-level low-pressure heater;
A hydrophobic part for the next stage low-pressure heater of described certain one-level low-pressure heater is communicated with the hydrophobic inlet fluid of low temperature of described low pressure drain cooler, after described low pressure drain cooler heating vaporization, enter this next stage low-pressure heater, for heat-setting water, hydrophobic another part of the next stage low-pressure heater of described certain one-level low-pressure heater is from flowing to next stage low-pressure heater or condenser again.
Preferably, on the pipeline between the hydrophobic entrance of the high temperature of described low pressure drain cooler and the hydrophobic outlet of described certain one-level low-pressure heater, valve is not set.
Preferably, described certain one-level low-pressure heater is the inferior final stage low-pressure heater of described heat regenerative system, and the next stage low-pressure heater of described certain one-level low-pressure heater 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 is arranged between the two-stage low-pressure heater that exists blocked drain.
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.
The present invention also provides a kind of generating set, and this generating set comprises above-mentioned low pressure drain cooler heat regenerative system.
Preferably, described generating set is subcritical generating set, supercritical generating unit or ultra supercritical power generation unit.
Draining system of the present invention has utilized the hydrophobic heat of low-pressure heater, by low pressure drain cooler system, the low-pressure heater that heated pressure is lower hydrophobic, after hydrophobic heated vaporization, the steam producing draws and is 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 the existing hydrophobic heat regenerative system of flowing automatically step by step;
Fig. 2 is according to the system flow chart of the low pressure drain cooler heat regenerative system of 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.
The specific embodiment
Below with reference to accompanying drawing, preferred embodiment of the present invention is elaborated, 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 just for the connotation of 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, than certain one-level low-pressure heater, one-level low-pressure heater in more close condenser position is called " next stage low-pressure heater ", is 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 pass through surface-type heat exchanger, enter next stage low-pressure heater or condenser after suitably cooling with main condensate by hydrophobic again, this surface-type heat exchanger is referred to as drain cooler.Herein, the operating pressure of drain cooler at 0.02MPa (a) between 0.2MPa (a), therefore claim again low pressure drain cooler.
Low-pressure heater: low-pressure heater herein refer to rated pressure at 0.015MPa (a) to the surface heater between 0.2MPa (a).Herein, low-pressure heater can be single-row, can be also biserial.In ultra supercritical unit, refer generally to rated pressure at 0.015MPa (a) to the surface heater between 0.2MPa (a).In supercritical unit, refer generally to rated pressure at 0.015MPa (a) to the surface heater between 0.15MPa (a).In other units, refer generally to rated pressure at 0.015MPa (a) to the surface heater between 0.1MPa (a).
Fig. 2 illustrates according to the system flow chart of the low pressure drain cooler heat regenerative system 101 of the first embodiment of the present invention.Low pressure drain cooler heat regenerative system 101 of the present invention is parts of steamer generating 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 the low-pressure heater of specific quantity can be set as required.
From in prior art by inferior final stage low-pressure heater 3-2 hydrophobic from flow to final stage low-pressure heater 3-1 different be, in the present embodiment, hydrophobic entrance 61 fluids of high temperature of the hydrophobic and drain cooler 6 of inferior final stage low-pressure heater 3-2 are communicated with, and after drain cooler 6, enter 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 hydrophobic entrance 62 fluids of low temperature of drain cooler 6 via another pipeline and another drain valve 5, after drain cooler 6 heating vaporizations, 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 arrange according to the thermal balance of system.
, inferior final stage low-pressure heater 3-2 hydrophobic can enter drain cooler 6 and heat a part of final stage low-pressure heater 3-1 hydrophobic.The hydrophobic drain cooler 6 that enters of part of final stage low-pressure heater 3-1, after heated vaporization, the steam of generation draws 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, for example, to current common ultra supercritical unit, the about 0.02MPa(a of specified operating pressure that final stage low-pressure heater is hydrophobic).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 time final stage low-pressure heater 3-2 is about 0.1MPa, pressure reduction is larger, and there is not the corresponding flow resistance such as drain valve in inferior final stage low-pressure heater 3-2 to the pipeline of low pressure drain cooler 6, because this final stage low-pressure heater 3-2 hydrophobic can flow to drain cooler 6 and can not exist the problem of blocked drain swimmingly.
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 hydrophobic drain cooler that passes through of low-pressure heater of certain one-level intergrade, heat low-pressure heater hydrophobic 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 two-way that is divided into of this intergrade next stage low-pressure heater 3n-1, 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 fluids via another pipeline and another drain valve 5, after drain cooler 6 heating vaporizations, 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, can, according to extraction pressure, after the low-pressure heater of blocked drain, set up drain cooler, thereby 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 the low-pressure heater of specific quantity can be set as required.In addition, although a drain cooler system is only shown in figure, as required, multiple drain cooler systems also can be set, for solving the blocked drain problem between multiple low-pressure heaters.
Low pressure drain cooler heat regenerative system tool of the present invention has the following advantages:
1. in system configuration of the present invention, what in drain cooler, heated medium was low-pressure heater is hydrophobic, and pressure is lower.For example, to current common ultra supercritical power generation unit, the about 0.02MPa of specified operating pressure (a) that final stage low-pressure heater is hydrophobic, 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 for example, to 1 1000MW ultra supercritical thermal power generation unit, the equipment of low pressure drain cooler system and piping investment can drop to approximately 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 limited technological transformation project in place has been created strong condition.
5. applicability is good, is not only applicable to newly-built Fossil Fueled Power Plant Project, especially the energy-conservation technological transformation of the unit that puts into operation is had to better applicability, is also particularly useful for high parameter Fossil Fueled Power Plant Project.
6. can be by a hydrophobic part for its next stage low-pressure heater of hydrophobic heating of certain grade of low-pressure heater, after the hydrophobic heated vaporization of this next stage low-pressure heater, can heat-setting water, improve thus heat regenerative 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 (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 the hydrophobic outlet of certain one-level low-pressure heater via pipeline, the hydrophobic low-pressure heater that enters described condenser or another stage pressure Temperature Matching after described low pressure drain cooler is cooling of described certain one-level low-pressure heater;
A hydrophobic part for the next stage low-pressure heater of described certain one-level low-pressure heater is communicated with the hydrophobic inlet fluid of low temperature of described low pressure drain cooler, after described low pressure drain cooler heating vaporization, enter this next stage low-pressure heater, for heat-setting water, hydrophobic another part of the next stage low-pressure heater of described certain one-level low-pressure heater 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, on the pipeline between the hydrophobic entrance of high temperature and the hydrophobic outlet of described certain one-level low-pressure heater of described low pressure drain cooler, valve is not set.
3. low pressure drain cooler heat regenerative system according to claim 1, it is characterized in that, described certain one-level low-pressure heater is the inferior final stage low-pressure heater of described heat regenerative system, and the next stage low-pressure heater of described certain one-level low-pressure heater 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 is arranged between the two-stage low-pressure heater that exists blocked drain.
6. low pressure drain cooler heat regenerative system according to claim 1, 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 claim 1-8 any one.
10. generating set according to claim 9, is characterized in that, described generating set is subcritical generating set, supercritical generating unit or ultra supercritical power generation unit.
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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 CN103836608B (en) | 2016-03-23 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782946A (en) * | 2016-05-09 | 2016-07-20 | 中国能源建设集团广东省电力设计研究院有限公司 | Vertical high-pressure heater drain system |
| CN107062351A (en) * | 2017-05-08 | 2017-08-18 | 华电电力科学研究院 | A kind of heat supply network progressive solution system and its adjusting method using small steam turbine |
| 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 |
| 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 |
| 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101886804A (en) * | 2010-05-26 | 2010-11-17 | 中国电力工程顾问集团华北电力设计院工程有限公司 | All-backheating drainage system of heat supply network heater for supercritical concurrent boiler thermal power plant |
| CN102519033A (en) * | 2011-12-19 | 2012-06-27 | 中国电力工程顾问集团西北电力设计院 | Supercritical/super-supercritical unit heating drain recovery method |
| CN202647718U (en) * | 2012-06-04 | 2013-01-02 | 河北省电力勘测设计研究院 | Supercritical clamminess heating machine set heat supply net drainage treating system |
| CN203797629U (en) * | 2014-03-10 | 2014-08-27 | 中国电力工程顾问集团华东电力设计院 | Low-pressure drain cooler regenerative system and generator set |
-
2014
- 2014-03-10 CN CN201410085792.7A patent/CN103836608B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101886804A (en) * | 2010-05-26 | 2010-11-17 | 中国电力工程顾问集团华北电力设计院工程有限公司 | All-backheating drainage system of heat supply network heater for supercritical concurrent boiler thermal power plant |
| CN102519033A (en) * | 2011-12-19 | 2012-06-27 | 中国电力工程顾问集团西北电力设计院 | Supercritical/super-supercritical unit heating drain recovery method |
| CN202647718U (en) * | 2012-06-04 | 2013-01-02 | 河北省电力勘测设计研究院 | Supercritical clamminess heating machine set heat supply net drainage treating system |
| CN203797629U (en) * | 2014-03-10 | 2014-08-27 | 中国电力工程顾问集团华东电力设计院 | Low-pressure drain cooler regenerative system and generator set |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105782946A (en) * | 2016-05-09 | 2016-07-20 | 中国能源建设集团广东省电力设计研究院有限公司 | Vertical high-pressure heater drain system |
| CN107062351A (en) * | 2017-05-08 | 2017-08-18 | 华电电力科学研究院 | A kind of heat supply network progressive solution system and its adjusting method using small steam turbine |
| 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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