CN203404769U - Improved water supply backheating and drain system with medium pressure heater - Google Patents
Improved water supply backheating and drain system with medium pressure heater Download PDFInfo
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- CN203404769U CN203404769U CN201320377870.1U CN201320377870U CN203404769U CN 203404769 U CN203404769 U CN 203404769U CN 201320377870 U CN201320377870 U CN 201320377870U CN 203404769 U CN203404769 U CN 203404769U
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- pressure heater
- heater
- feedwater
- hydrophobic
- oxygen
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Abstract
The utility model discloses an improved water supply backheating and drain system with a medium pressure heater. The system comprises a water supply pipe, a pre-pump, the medium pressure heater, a water supply pump and high pressure heaters, wherein the pre-pump, the medium pressure heater, the water supply pump and the high pressure heaters are successively arranged on the water supply pipe along the water supply direction. A drain pipe is arranged between the high pressure heaters and the outlet of the medium pressure heater. The drain water of the high pressure heaters is drained to the outlet of the medium pressure heater through the drain pipe. At least two high pressure heaters are arranged, wherein the first high pressure heater and the second high pressure heater are respectively arranged along the water supply direction. A drain pipe is arranged between the second high pressure heater and the first high pressure heater. By changing the arrangement manner of the heaters, water supply backheating and drain manners are changed. The thermal economy of a unit is improved, and the investment cost of the heaters is reduced.
Description
Technical field
The present invention relates to field, power plant, relate to particularly a kind of feedwater backheat and draining system of power plant.
Background technology
The Steam Turbine in modern power plant all adopts the heating of feedwater backheat unlimitedly, and it plays an important role to the heat-economy of unit and power plant.
The arranging of conventional power generation usage factory heat regenerative system generally adopts non-adjusting to draw gas to feed-water heater to carry out heated feed water, according to feedwater flow to, heated feed water in low-pressure heater, oxygen-eliminating device, high-pressure heater successively.Wherein after oxygen-eliminating device, arranging fore pump, feed pump, is low-pressure heater before oxygen-eliminating device, after feed pump, is high-pressure heater, and hydrophobic after high-pressure heater heat exchange of drawing gas, tradition is generally according to the mode of flowing automatically step by step; And for low-pressure heater draining system, drainage pump mode is set individually, by hydrophobic, squeeze in these heater outlet current.A kind of so conventional arrangement of low-pressure heater, oxygen-eliminating device, fore pump, feed pump, high-pressure heater is passed through in feedwater successively, the problem of bringing is that feedwater is after oxygen-eliminating device backheat, follow-up feedwater backheat just all completes in the high-pressure heater of feed pump outlet, be placed in the high-pressure heater of feed pump outlet, because the pressure rating feeding water is far away higher than low-pressure heater, thereby its cost is also far above low-pressure heater.In addition, the draining system of high-pressure heater often adopts the mode of gravity flow step by step, this corresponding part of heater of not only squeezing its hydrophobic inflow is drawn gas, thereby reduced heat-economy, and due to hydrophobic, in gravity flow process step by step, hydrophobic pressure constantly reduces, and energy constantly devalues, finally, the hydrophobic oxygen-eliminating device that all comes together in of high-pressure heater.Then, come together in the hydrophobic of oxygen-eliminating device and by fore pump and feed pump, boost again, then send into boiler, this can increase the wasted work of pump.
Summary of the invention
Because the above-mentioned defect of prior art, the present invention aims to provide modified feedwater backheat and the draining system of pressing heater in a kind of band, by changing the original arrangement of heater, change feedwater heat recovery process, reduce heater cost, and adopt new hydrophobic mode on new heater arrangement basis, to solve hydrophobic subordinate is drawn gas squeeze impact, reduce the hydrophobic technical problems such as the pressure loss of high-pressure heater of high-pressure heater.
For solving above technical problem, the present invention is achieved by the following technical solutions:
In press modified feedwater backheat and the draining system of heater, comprise feedwater piping, along feedwater direction, be successively set on the fore pump on described feedwater piping, middle pressure heater, feed pump, high-pressure heater; Wherein, between described high-pressure heater and described middle pressure heater outlet, drain water piping is set, the hydrophobic of described high-pressure heater dredged to described middle pressure heater outlet by drain water piping, at least two of the numbers of described high-pressure heater, along feedwater direction, be respectively the first high-pressure heater and the second high-pressure heater, between wherein said the second high-pressure heater and the first high-pressure heater, drain water piping be set.
Alternatively, between described middle pressure heater and described oxygen-eliminating device import, drain water piping is set, the hydrophobic of described middle pressure heater dredged to described oxygen-eliminating device by drain water piping.
Alternatively, described feedwater piping is also provided with the low-pressure heater that is positioned at described oxygen-eliminating device front end.
Alternatively, described middle pressure heater can be presses heater in parallel or be to press heater in one in two, or the connected mode of a plurality of middle pressure heaters can be serial or parallel connection, can be also the mode that series connection combines with parallel connection.
Beneficial effect of the present invention is:
1. the present invention arranges middle pressure heater between the fore pump of feedwater piping and feed pump, and pressure rating relatively (high-pressure heater) is not high, thereby can reduce heater cost.
2. the present invention has changed the hydrophobic mode of original traditional high-pressure heater, because high-pressure heater hydrophobic do not enter middle pressure heater, but enter on the feedwater piping of middle pressure heater outlet, thereby avoided the hydrophobic centering of high-pressure heater to press the impact of squeezing that heater draws gas.
3. the present invention, because high-pressure heater hydrophobic directly dredged by a drain water piping on the outlet feedwater piping of middle pressure heater, has reduced the hydrophobic pressure loss of high-pressure heater, has reduced the wasted work of fore pump.
4. the present invention enters the thin discharge reduction of oxygen-eliminating device, even realizes without any hydrophobic oxygen-eliminating device that enters, thereby the amount of drawing gas of oxygen-eliminating device can increase, the deep deoxygenization ability that this can strengthen oxygen-eliminating device, is conducive to prevent the spontaneous boiling of oxygen-eliminating device, has improved the margin of safety of oxygen-eliminating device.
Accompanying drawing explanation
In order to be illustrated more clearly in the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, to those skilled in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the theory structure schematic diagram of a kind of traditional feedwater backheat and draining system.
Fig. 2 is another kind of traditional feedwater backheat and the theory structure schematic diagram of draining system.
Fig. 3 is the theory structure schematic diagram of a specific embodiment of the present invention.
The specific embodiment
In order to understand better technique scheme of the present invention, below in conjunction with drawings and Examples, describe in detail further.
Fig. 1 has provided a kind of principle schematic of traditional feedwater backheat and draining system, comprise feedwater piping 10, low-pressure heater 1, oxygen-eliminating device 2, fore pump 3, middle pressure heater 4, feed pump 5, high-pressure heater 6, high-pressure heater 33 are flow through in feedwater successively, and feedwater is process backheat Steam Heating in low-pressure heater, oxygen-eliminating device, high-pressure heater respectively; Between described high-pressure heater 33 and described high-pressure heater 6, drain water piping 34 is set, described high-pressure heater 33 is dredged to described high-pressure heater 6 by drain water piping 34; Between described high-pressure heater 6 and described middle pressure heater 4, drain water piping 8 is set, the hydrophobic of described high-pressure heater 6 dredged to described middle pressure heater 4 by drain water piping 8; Between described middle pressure heater 4 and 2 imports of described oxygen-eliminating device, drain water piping 9 is set, the hydrophobic of described middle pressure heater 4 dredged to described oxygen-eliminating device 2 by drain water piping 9.
Fig. 2 has provided the another kind of principle schematic of traditional feedwater backheat and draining system, comprise feedwater piping 10, low-pressure heater 1, oxygen-eliminating device 2, fore pump 3, middle pressure heater 4, feed pump 5, high-pressure heater 6, high-pressure heater 33 are flow through in feedwater successively, and feedwater is process backheat Steam Heating in low-pressure heater, oxygen-eliminating device, high-pressure heater respectively; Between described high-pressure heater 33 and described high-pressure heater 6, drain water piping 34 is set, described high-pressure heater 33 is dredged to described high-pressure heater 6 by drain water piping 34; Between described high-pressure heater 6 and described middle pressure heater 4, drain water piping 8 is set, the hydrophobic of described high-pressure heater 6 dredged to described middle pressure heater 4 by drain water piping 8; Between described middle pressure heater 4 and 4 outlets of described middle pressure heater, drain water piping 11 is set, described drain water piping 11 arranges middle pressure drainage pump 31, described middle pressure heater 4 hydrophobic by drainage pump 31, by drain water piping 11 dredge to pressure heater 4 in described to water out.
Below in conjunction with the specific embodiment of certain 1000MW of power plant unit, further set forth the present invention.Should be understood that these embodiment are only for aid illustration but not limit the scope of the invention.
Embodiment mono-
As shown in Figure 3, be a specific embodiment of the present invention, comprise the low-pressure heater 1, oxygen-eliminating device 2, fore pump 3, middle pressure heater 4, feed pump 5, high-pressure heater 6, the high-pressure heater 33 that by feedwater piping 10, are connected successively; The number of described middle pressure heater is one; Between described high-pressure heater 33 and described high-pressure heater 6, drain water piping 34 is set, described high-pressure heater 33 is dredged to described high-pressure heater 6 by drain water piping 34; Between described high-pressure heater 6 and the outlet of described middle pressure heater 4, drain water piping 12 is set, the hydrophobic of described high-pressure heater 6 dredged to the outlet of described middle pressure heater 4 by drain water piping 12; Between described middle pressure heater 4 and 2 imports of described oxygen-eliminating device, drain water piping 9 is set, the hydrophobic of described middle pressure heater 4 dredged to described oxygen-eliminating device 2 by drain water piping 9.
Compare with tradition feedwater backheat and draining system as shown in Figure 1, be in feedwater different from conventional art of the present invention flow through low-pressure heater 1 successively, oxygen-eliminating device 2, fore pump 3, middle pressure heater 4, feed pump 5, high-pressure heater 6, high-pressure heater 33, feedwater is respectively at low-pressure heater, oxygen-eliminating device, middle pressure heater, process backheat Steam Heating in high-pressure heater, between described high-pressure heater 6 and the outlet of described middle pressure heater 4, drain water piping 12 is set, the hydrophobic of described high-pressure heater 6 dredged to the outlet of described middle pressure heater 4 by drain water piping 12.
Alternatively, when the hydrophobic pressure of high-pressure heater is greater than middle pressure heater outlet feed pressure, on drain water piping, can install a pressure regulator valve additional, to control the hydrophobic pressure of high-pressure heater, prevent the hydrophobic emptying and pipe vibration of high-pressure heater.
Alternatively, the hydrophobic pressure of high-pressure heater is less than middle pressure heater outlet feed pressure, can on drain water piping, install drainage pump additional dredges the hydrophobic of high-pressure heater into middle pressure heater outlet supply line, also can be by adjusting fore pump outlet pressure, make middle pressure heater outlet feed pressure be slightly less than the hydrophobic pressure of high-pressure heater, thereby realize the hydrophobic of high-pressure heater, dredge to middle pressure heater outlet feedwater piping.
Due to the hydrophobic outlet that directly enters middle pressure heater 4 of high-pressure heater 6, the feedwater flow that enters fore pump 3 is reduced, thereby reduce the wasted work of fore pump 3; But also can avoid high-pressure heater 6 hydrophobic subordinate's heater is drawn gas squeeze impact, improve heat-economy.In addition, in adopting, press heater 4 between fore pump 3 and feed pump 5, pressure rating is lower, and because high-pressure heater 6 hydrophobic directly entered feed pump 5 imports, in, press heater 4 to water out, thereby the feedwater flow of the middle pressure heater 4 of flowing through will reduce, thereby the cost of middle pressure heater also can reduce.
The 1000MW unit of take carries out analytical calculation to its economy as example.
Relevant parameter (THA operating mode) under table 1 tradition feedwater backheat and hydrophobic mode
| Fore pump outlet pressure (MPa) | 3.25 |
| Fore pump inlet flow rate (kg/s) | 758.967 |
| Fore pump shaft power (KW) | 2262 |
| Main steam enthalpy (kJ/kg) | 3486.2 |
| Heat content increment (kJ/kg) again | 576.7 |
| High 6 amounts of drawing gas (kg/s) that add of the first order | 86.108 |
| The first order is high adds 6 enthalpies (kJ/kg) that draw gas | 3087.2 |
| The high 6 hydrophobic amounts (kg/s) that add of the first order | 123.974 |
| The high 6 hydrophobic enthalpies (kJ/kg) that add of the first order | 958.2 |
| Middle pressure heater 4 amounts of drawing gas (kg/s) | 30.784 |
| Middle pressure heater 4 enthalpy (kJ/kg) that draws gas | 3388.4 |
| The hydrophobic amount of middle pressure heater 4 (kg/s) | 154.758 |
| The hydrophobic enthalpy of middle pressure heater 4 (kJ/kg) | 826.6 |
?
| The oxygen-eliminating device amount of drawing gas (kg/s) | 25.612 |
| The oxygen-eliminating device enthalpy (kJ/kg) that draws gas | 3194.3 |
| Deaerator feedwater import enthalpy (kJ/kg) | 656.4 |
| Deaerator feedwater outlet enthalpy (kJ/kg) | 776.7 |
| Feedwater flow (kg/s) | 758.967 |
Adopt after the feedwater backheat and hydrophobic mode of the present embodiment, high-pressure heater 6 is dredged to the outlet of middle pressure heater 4 and the feedwater piping between feed pump import by drain water piping 12, and the hydrophobic of middle pressure heater 4 dredged to described oxygen-eliminating device 2 by drain water piping 9, this reduces the total hydrophobic amount that enters oxygen-eliminating device 2, therefore the amount of drawing gas of oxygen-eliminating device 2 correspondences can increase, meanwhile, the amount of drawing gas of middle pressure heater 4 correspondences also can increase.
According to above-mentioned data, substantially constant by oxygen-eliminating device outlet enthalpy, suppose that the amount of drawing gas that enters oxygen-eliminating device after transformation is X, by heat conservation: X * 3194.3+578.597 * 656.4+30.784 * 826.6=(X+578.597+30.784) * 776.7.Can calculate after transformation, the oxygen-eliminating device amount of drawing gas X=28.2kg/s, increases 2.6kg/s relatively.After transformation, entering fore pump flow is (28.2+578.597+30.784)=637.6kg/s; Pump lift is substantially constant, therefore improved fore pump shaft power is 2262 * (637.6/758.967)=1900kW, fore pump shaft power reduces 362kW, is converted to rate of standard coal consumption, can be therefore and the about 0.11g/kWh that declines.
In like manner, high-pressure heater 6 hydrophobic no longer enters middle pressure heater 4, avoided centering to press squeezing that heater 4 draws gas, can make middle pressure heater 4 amounts of drawing gas increase, meanwhile, the feedwater flow that enters middle pressure heater 4 reduces, and is 637.6Kg/s, its amount of drawing gas also can correspondingly reduce, therefore the amount of drawing gas of middle pressure heater 4 increases relatively:
(637.6/758.967)×123.974×(958.2-931.4)/3388.4=0.82kg/s。
Owing to having avoided the hydrophobic centering of high-pressure heater 6 to press the impact of squeezing of heater 4 and oxygen-eliminating device 2, thus heat-economy raising, doing work:
2.6×（3388.4－3194.3）＋0.82×（3663.9－3388.4）＝730kW
Be converted to rate of standard coal consumption, therefore can be and the about 0.22g/kWh that declines.
To sum up, adopt this draining system technology to compare traditional hydrophobic mode and can reduce the about 0.33g/kWh of coal consumption; In addition, also can make the cost of middle pressure heater greatly reduce, but no longer this be done economic computational analysis at this place.
Claims (5)
1. modified feedwater backheat and a draining system of in band, pressing heater, comprise feedwater piping, along feedwater direction, is successively set on the fore pump on described feedwater piping, middle pressure heater, feed pump, high-pressure heater; It is characterized in that, between described high-pressure heater and described middle pressure heater outlet, drain water piping is set, the hydrophobic of described high-pressure heater dredged to described middle pressure heater outlet by drain water piping, at least two of the numbers of described high-pressure heater, along feedwater direction, be respectively the first high-pressure heater and the second high-pressure heater, between described the second high-pressure heater and the first high-pressure heater, drain water piping be set.
2. modified feedwater backheat and the draining system of in band as claimed in claim 1, pressing heater, is characterized in that, described feedwater piping is also provided with the oxygen-eliminating device that is positioned at described fore pump front end.
3. in band as claimed in claim 2, press modified feedwater backheat and the draining system of heater, it is characterized in that, between described middle pressure heater and described oxygen-eliminating device import, drain water piping is set, the hydrophobic of described middle pressure heater dredged to described oxygen-eliminating device by being arranged on described middle pressure heater and the drain water piping between described oxygen-eliminating device import.
4. modified feedwater backheat and the draining system of in band as claimed in claim 3, pressing heater, is characterized in that, described feedwater piping is also provided with the low-pressure heater that is positioned at described oxygen-eliminating device front end.
5. in band as claimed in claim 4, press modified feedwater backheat and the draining system of heater, it is characterized in that, described middle pressure heater can be presses heater in parallel or be to press heater in one in two, or the connected mode of a plurality of middle pressure heaters can be serial or parallel connection, it can be also the mode that series connection combines with parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320377870.1U CN203404769U (en) | 2013-04-19 | 2013-06-27 | Improved water supply backheating and drain system with medium pressure heater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310139776.7 | 2013-04-19 | ||
| CN201310139776 | 2013-04-19 | ||
| CN201320377870.1U CN203404769U (en) | 2013-04-19 | 2013-06-27 | Improved water supply backheating and drain system with medium pressure heater |
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| CN203404769U true CN203404769U (en) | 2014-01-22 |
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Family Applications (5)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310264512.4A Active CN104110676B (en) | 2013-04-19 | 2013-06-27 | A kind of feedwater backheat and draining system |
| CN201320376138.2U Expired - Lifetime CN203404768U (en) | 2013-04-19 | 2013-06-27 | Feed water heat regenerative and draining system with media-pressure heater |
| CN201320377916.XU Expired - Lifetime CN203404770U (en) | 2013-04-19 | 2013-06-27 | Water supply backheating and drain system with medium pressure heater and drain pump |
| CN201320376186.1U Expired - Lifetime CN203395908U (en) | 2013-04-19 | 2013-06-27 | Improved water supply, heat regeneration and water drainage system with medium-pressure heaters and water drainage pump |
| CN201320377870.1U Expired - Lifetime CN203404769U (en) | 2013-04-19 | 2013-06-27 | Improved water supply backheating and drain system with medium pressure heater |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310264512.4A Active CN104110676B (en) | 2013-04-19 | 2013-06-27 | A kind of feedwater backheat and draining system |
| CN201320376138.2U Expired - Lifetime CN203404768U (en) | 2013-04-19 | 2013-06-27 | Feed water heat regenerative and draining system with media-pressure heater |
| CN201320377916.XU Expired - Lifetime CN203404770U (en) | 2013-04-19 | 2013-06-27 | Water supply backheating and drain system with medium pressure heater and drain pump |
| CN201320376186.1U Expired - Lifetime CN203395908U (en) | 2013-04-19 | 2013-06-27 | Improved water supply, heat regeneration and water drainage system with medium-pressure heaters and water drainage pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402839A (en) * | 2016-08-30 | 2017-02-15 | 山东电力工程咨询院有限公司 | Dual-boosting boiler water feed system for power station units |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175664B (en) * | 2021-04-19 | 2022-08-09 | 西安交通大学 | Recycling device and method for mixed working medium of feed water heating system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08152103A (en) * | 1994-11-29 | 1996-06-11 | Hitachi Ltd | Saturated drain apparatus |
| JPH11325406A (en) * | 1998-05-07 | 1999-11-26 | Ebara Corp | Feed water heating device for thermal power generation facility |
| CN102116469B (en) * | 2009-12-30 | 2013-06-12 | 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 |
| CN102235661B (en) * | 2010-04-27 | 2014-10-15 | 王汝武 | Drainage connecting system and method for steam turbine regeneration system |
| CN202403258U (en) * | 2011-11-22 | 2012-08-29 | 邹治平 | Water-supply steam-extraction regenerative heating system of coal-fired power plant |
| CN102809142B (en) * | 2012-09-07 | 2015-03-11 | 中国电力工程顾问集团华东电力设计院 | Heat recovery system for secondary reheating unit in power plant and power plant |
-
2013
- 2013-06-27 CN CN201310264512.4A patent/CN104110676B/en active Active
- 2013-06-27 CN CN201320376138.2U patent/CN203404768U/en not_active Expired - Lifetime
- 2013-06-27 CN CN201320377916.XU patent/CN203404770U/en not_active Expired - Lifetime
- 2013-06-27 CN CN201320376186.1U patent/CN203395908U/en not_active Expired - Lifetime
- 2013-06-27 CN CN201320377870.1U patent/CN203404769U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402839A (en) * | 2016-08-30 | 2017-02-15 | 山东电力工程咨询院有限公司 | Dual-boosting boiler water feed system for power station units |
Also Published As
| Publication number | Publication date |
|---|---|
| CN203395908U (en) | 2014-01-15 |
| CN104110676A (en) | 2014-10-22 |
| CN104110676B (en) | 2017-03-08 |
| CN203404768U (en) | 2014-01-22 |
| CN203404770U (en) | 2014-01-22 |
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