CN104110676A - Feed water backheating and draining system - Google Patents
Feed water backheating and draining system Download PDFInfo
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- CN104110676A CN104110676A CN201310264512.4A CN201310264512A CN104110676A CN 104110676 A CN104110676 A CN 104110676A CN 201310264512 A CN201310264512 A CN 201310264512A CN 104110676 A CN104110676 A CN 104110676A
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Abstract
The invention discloses a feed water backheating and draining system. The feed water backheating and draining system comprises a water feeding pipeline, wherein a front pump, a medium-pressure heater, a water feeding pump and a high-pressure heater are sequentially arranged on the water feeding pipe along the water feeding direction; a water draining pipe is arranged between an outlet of the high-pressure heater and an outlet of the medium-pressure heater; and water drained from the high-pressure heater is drained to the outlet of the medium-pressure heater through the water draining pipe. By the feed water backheating and draining system, the problems that water drained from the traditional feed water backheating and draining system squeezes lower-stage extracted steam and loss on water drainage pressure is high are solved. The heat economy of a unit is improved by changing an arrangement mode of the heater and changing a feed water backheating and draining mode; and the cost of the heater 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 a kind of feedwater backheat and draining system, 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:
Feedwater backheat and a draining system, 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; Wherein, between described high-pressure heater and the outlet of described middle pressure heater, drain water piping is set, the hydrophobic of described high-pressure heater dredged to the outlet of described middle pressure heater by drain water piping.
Alternatively, when the hydrophobic pressure of high-pressure heater is greater than fore pump outlet feed pressure, on drain water piping, can install a pressure regulator valve additional, to control the hydrophobic pressure of high-pressure heater, prevent that HP heater drainage pressure and fore pump outlet feed pressure from differing the pipe vibration and the high-pressure heater that cause too greatly hydrophobic emptying.
Alternatively, the hydrophobic pressure of high-pressure heater is less than fore pump outlet feed pressure, can on drain water piping, install drainage pump additional and promote the hydrophobic pressure of high-pressure heater, thereby dredge into middle pressure heater outlet feedwater piping, also can be by adjusting fore pump outlet pressure, make fore pump 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.
In technique scheme, described water supply system is also provided with along feedwater direction the oxygen-eliminating device that is positioned at described fore pump front end, with the low-pressure heater that is positioned at described oxygen-eliminating device front end.
As preferably, in technique scheme, 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.
As preferably, in technique scheme, giving between water out of described middle pressure heater and described middle pressure heater arranges drain water piping, described drain water piping arranges drainage pump, described middle pressure heater hydrophobic by drainage pump, by drain water piping dredge to pressure heater in described to water out.
In technique scheme, the number of described high-pressure heater is at least one.
In technique scheme, described high-pressure heater can be biserial (two high-pressure heater parallel connections) and also can be single-row (high-pressure heater), between a plurality of high-pressure heaters, connected mode can be serial or parallel connection, can be also series connection and connected mode of mixing in parallel.
In technique scheme, no matter described high-pressure heater adopts single-row or biserial, according to feedwater flow to, the high-pressure heater that feedwater is flowed through is at first called first order high-pressure heater.
In technique scheme, the number of described middle pressure heater is at least one.
In technique scheme, described middle pressure heater can be biserial (pressing heater parallel connection in two) and also can be single-row (in one, pressing heater), the connected mode of a plurality of middle pressure heaters can be series connection, also can be parallel connection, can be also series connection and the connected mode combining in parallel.
In technique scheme, no matter described middle pressure heater adopts single-row or biserial, according to feedwater flow, to, the middle pressure heater that feedwater is flowed through at first, is called and in the first order, presses heater.
In technique scheme, the hydrophobic of described high-pressure heater dredged to the feedwater piping between described middle pressure heater outlet and described feed pump import by drain water piping, the present invention is arranged in one or more heaters in the middle of fore pump and feed pump, because fore pump outlet pressure grade is far below feed pressure, but higher than low-pressure heater operating pressure, thereby the heater of arranging after fore pump, before feed pump is called middle pressure heater.
Further, hydrophobic the hydrophobic of high-pressure heater of dredging described in also can be understood as to the outlet of middle pressure heater by drain water piping of described high-pressure heater dredged in described two and pressed the feedwater piping between heater by drain water piping, also can be understood as described the hydrophobic of high-pressure heater and dredge to the feedwater piping between described middle pressure heater and feed pump by drain water piping, also can be understood as described the hydrophobic of high-pressure heater and dredge the import to described feed pump by drain water piping.
What need arouse attention is, basis of the present invention is that one or more heaters are arranged in the middle of fore pump and feed pump, under this basis, by the change heat recovery process that feeds water, the hydrophobic of high-pressure heater dredged to the feedwater piping between middle pressure heater outlet and feed pump import by drain water piping; And the hydrophobic of middle pressure heater both can be according to the mode of flowing automatically step by step; also can return to the feedwater piping of middle pressure heater outlet by a drainage pump; thereby; in basis, press like this number of heater; can there be multiple feedwater backheat and hydrophobic combination, but all should be in scope of patent protection of the present invention.
Further, the present invention is in having studied the loss of the hydrophobic mode of flowing automatically step by step, except squeezing loss, existence also there is the pressure loss, made up the deficiency to the hydrophobic mode theoretical research of flowing automatically step by step in existing Thermal Power Station theoretical system, a kind of arrangement of feed-water heater is proposed, the backheat that feeds water and hydrophobic mode.Be intended to protect a kind of hydrophobic method that subordinate is drawn gas and squeezes impact and reduce hydrophobic pressure energy loss of avoiding, therefore, any research based on this theory and the hydrophobic pressure loss measure of reduction that proposes all should be in by the determined protection domain of invention.
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.
Fig. 4 is the theory structure schematic diagram of another specific embodiment of the present invention.
Fig. 5 is the theory structure schematic diagram of another specific embodiment of the present invention
Fig. 6 is the theory structure schematic diagram of another specific embodiment of the present invention
Fig. 7 is the theory structure schematic diagram of another specific embodiment of the present invention
Fig. 8 is the theory structure schematic diagram of another specific embodiment of the present invention
In figure: the 1st, low-pressure heater; The 2nd, oxygen-eliminating device; The 3rd, fore pump; The 4th, middle pressure heater; The 5th, feed pump; The 6th, high-pressure heater; The 7th, middle pressure heater; 8-9 is drain water piping; The 10th, feedwater piping; 11-20 is drain water piping; The 21st, drainage pump; 22-24 is drain water piping; 25, the 27, the 31st, drainage pump; 26,28-30 is drain water piping; The 33rd, high-pressure heater; The 34th, drain water piping.
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.
The invention provides a kind of feedwater backheat and draining system, key point is the feature of utilizing water supply preposition pump discharge pressure not high, change original feed-water heater arrangement, change original feedwater backheat mode, middle pressure heater is arranged between fore pump and feed pump; Thereby change the hydrophobic mode of flowing automatically step by step of original high-pressure heater, the heater of the corresponding hydrophobic no longer Shi Shuru of high-pressure heater subordinate, but dredge the outlet into middle pressure heater, thereby avoid this grade of high-pressure heater hydrophobic subordinate is drawn gas squeeze impact, reduced the power consumption of fore pump simultaneously.Wherein, press heater to be at least one, the connected mode between a plurality of middle pressure heaters can be serial or parallel connection, also can be series connection and connected mode of mixing in parallel.In addition, according to pressing the number of heater in series connection, also can there is multiple combination mode.
In addition, described high-pressure heater can be for one or more, the mode of flowing automatically step by step of the hydrophobic employing between a plurality of high-pressure heaters.High-pressure heater can be biserial (two high-pressure heater parallel connections) and also can be single-row (high-pressure heater), and between a plurality of high-pressure heaters, connected mode can be serial or parallel connection, can be also series connection and connected mode of mixing in parallel.
Further, no matter described high-pressure heater adopts single-row or biserial, according to feedwater flow to, the high-pressure heater that feedwater is flowed through is at first called first order high-pressure heater, the like.
Further, described middle pressure heater can be for one or more.Middle pressure heater can be biserial (pressing heater parallel connection in two) and also can be single-row (in one, pressing heater), and the connected mode of a plurality of middle pressure heaters can be series connection, also can be parallel connection, can be also series connection and the connected mode combining in parallel.
Further, no matter described middle pressure heater adopts single-row or biserial, and according to feedwater flow, to, the middle pressure heater that feedwater is flowed through at first, be called and in the first order, press heater, the like.
Further, hydrophobic the hydrophobic of high-pressure heater of dredging described in also can be understood as to the outlet of middle pressure heater by drain water piping of described high-pressure heater dredged in described two and pressed the feedwater piping between heater by drain water piping, also can be understood as described the hydrophobic of high-pressure heater and dredge to the feedwater piping between described middle pressure heater and feed pump by drain water piping, also can be understood as described the hydrophobic of high-pressure heater and dredge the import to described feed pump by drain water piping.
What need arouse attention is, basis of the present invention is that one or more heaters are arranged in the middle of fore pump and feed pump, under this basis, by the change heat recovery process that feeds water, the hydrophobic of high-pressure heater dredged to the feedwater piping between middle pressure heater outlet and feed pump import by drain water piping; And the hydrophobic of middle pressure heater both can be according to the mode of flowing automatically step by step; also can return to the feedwater piping of middle pressure heater outlet by a drainage pump; thereby; in basis, press like this number of heater; can there be multiple feedwater backheat and hydrophobic combination, but all should be in scope of patent protection of the present invention.
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.
Embodiment bis-
Further, as shown in Figure 4, be another 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 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 middle pressure drainage pump 31, by drain water piping 11 dredge to pressure heater 4 in described to water out.
Compare with tradition feedwater backheat and draining system as shown in Figure 2, be in feedwater different from conventional art of the present invention flow through low-pressure heater 1, oxygen-eliminating device 2, fore pump 3, middle pressure heater 4, feed pump 5, high-pressure heater 6 successively, feedwater is process backheat Steam Heating in low-pressure heater, oxygen-eliminating device, middle pressure heater, high-pressure heater respectively, 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 the water out of giving to 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 to the supply line between middle pressure heater outlet and feed pump import, also can in adjusting, press heater 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 the feedwater piping between middle pressure heater outlet and feed pump import.
Because high-pressure heater hydrophobic 6 directly enters the feedwater piping between middle pressure heater outlet and feed pump import, and no longer import oxygen-eliminating device, 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, due in adopting, press heater 4 between fore pump 3 and feed pump 5, pressure rating is lower, and due to the hydrophobic oxygen-eliminating device that no longer imports of high-pressure heater 6, thereby the feedwater flow of the middle pressure heater 4 of flowing through can reduce, thereby the cost of middle pressure heater 4 reduces greatly.
The hydrophobic hydrophobic drainage pump 31 that passes through of dredging to the feedwater piping between middle pressure heater 4 and feed pump 5 imports, middle pressure heater 4 when feed pump outlet high-pressure heater 6, by drain water piping 11 dredge in during the outlet of pressure heater 4, the amount of drawing gas of oxygen-eliminating device 2 correspondences can further increase, simultaneously, the amount of drawing gas of middle pressure heater 4 correspondences also can increase, but the increment that draws gas than example one is smaller, the minimizing that is equivalent to this part increment that draws gas has partly been admitted to oxygen-eliminating device, has increased steam turbine acting.
According to the data of table 1, 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=(X+578.597) * 776.7.Can calculate after transformation, the oxygen-eliminating device amount of drawing gas X=28.8Kg/s, increases 3.2Kg/s relatively.After transformation, entering fore pump flow is (28.8+578.597)=607.4Kg/s; Pump lift is substantially constant, therefore improved fore pump shaft power is 2262 * (607.4/758.967)=1810.3KW, fore pump shaft power reduces 451.7KW, is converted to rate of standard coal consumption, can be therefore and the about 0.125g/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 hydrophobic of middle pressure heater 4 returned on its outlet feedwater piping by drainage pump again, thereby the feedwater flow that enters middle pressure heater 4 is compared example still less for a moment, for 607.4Kg/s, its amount of drawing gas also can correspondingly reduce, therefore the amount of drawing gas of middle pressure heater 4 increases relatively:
(607.4/758.967)×123.974×(958.2-931.4)/3388.4=0.785Kg/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:
3.2×（3388.4－3194.3）＋0.785×（3663.9－3388.4）＝837KW
Be converted to rate of standard coal consumption, therefore can be and the about 0.235g/KWh that declines.
To sum up, adopt this draining system technology to compare traditional hydrophobic mode and can reduce the about 0.36g/KWh of coal consumption;
In addition, the analysis of similar embodiment one, the present embodiment can make the cost of middle pressure heater, and middle pressure heater 4 is without hydrophobic section is set again, therefore the cost of middle pressure heater further reduces, but no longer this is done economic computational analysis at this place.
What need arouse attention is; heater is owing to can be one or more; and the connected mode of a plurality of heaters can be serial or parallel connection; also can be the connected mode of mixing of connecting with in parallel; therefore the mode that the hydrophobic mode between heater can have cascaded drain and drainage pump mode to combine; according to the number of heater, can there is multiple combination mode like this, but all should be in scope of patent protection of the present invention.When the number that provides middle pressure heater is below two, the embodiment of several feedwater backheats and draining system, but be not limited to this.
Embodiment tri-
Further, as shown in Figure 5, be another specific embodiment of the present invention, comprise the low-pressure heater 1, oxygen-eliminating device 2, fore pump 3, middle pressure heater, feed pump 5, the high-pressure heater 6 that by feedwater piping 10, are connected successively; The number of described middle pressure heater is two; Along feedwater direction, be divided into pressing in the first order and in pressurizer 7 and the second level, press heater 4; In described high-pressure heater 6 and the described second level, press between the outlet of heater 4 drain water piping 13 is set, the hydrophobic of described high-pressure heater 6 dredged to the outlet of described middle pressure heater 4 by drain water piping 13; In the described second level, press in heater 4 and the described first order and press between heater 7 drain water piping 14 is set, in the described second level, press the hydrophobic employing of heater 4 mode of flowing automatically step by step, by drain water piping 14, dredge to the described first order and press heater 7; In the described first order, press between heater 7 and 2 imports of described oxygen-eliminating device drain water piping 15 is set, the hydrophobic of described middle pressure heater 7 dredged to described oxygen-eliminating device 2 by drain water piping 15; Realize a kind of feedwater backheat of the present invention and draining system.
Embodiment tetra-
Further, as shown in Figure 6, be another specific embodiment of the present invention, comprise the low-pressure heater 1, oxygen-eliminating device 2, fore pump 3, middle pressure heater, feed pump 5, the high-pressure heater 6 that by feedwater piping 10, are connected successively; The number of described middle pressure heater is two; Along feedwater direction, be divided into pressing in the first order and in pressurizer 7 and the second level, press heater 4; In described high-pressure heater 6 and the described second level, press between the outlet of heater 4 drain water piping 18 is set, the hydrophobic of described high-pressure heater 6 dredged to the outlet of described middle pressure heater 4 by drain water piping 18; In the described second level, press in heater 4 and the described first order and press between heater 7 drain water piping 19 is set, in the described second level, press the hydrophobic employing of heater 4 mode of flowing automatically step by step, by drain water piping 19, dredge to the described first order and press heater 7; In the described first order, press in heater 7 and the described first order and press between heater 7 outlets drain water piping 20 is set; described drain water piping 20 arranges middle pressure drainage pump 21; in the described first order, press the hydrophobic by middle pressure drainage pump 21 of heater 7, by drain water piping 20 dredge to press in the described first order heater 7 to water out; Realize a kind of feedwater backheat of the present invention and draining system.
Embodiment five
Further, as shown in Figure 7, be another specific embodiment of the present invention, comprise the low-pressure heater 1, oxygen-eliminating device 2, fore pump 3, middle pressure heater, feed pump 5, the high-pressure heater 6 that by feedwater piping 10, are connected successively; The number of described middle pressure heater is two; Along feedwater direction, be divided into pressing in the first order and in pressurizer 7 and the second level, press heater 4; In described high-pressure heater 6 and the described second level, press between the outlet of heater 4 drain water piping 28 is set, the hydrophobic of described high-pressure heater 6 dredged to the outlet of pressing heater 4 in the described second level by drain water piping 28; In the described second level, press in heater 4 and the described second level and press between heater 4 outlets drain water piping 24 is set, described drain water piping 24 arranges middle pressure drainage pump 25, in the described second level, press the hydrophobic by middle pressure drainage pump 25 of heater 4, by drain water piping 24 dredge to press in the described second level heater 4 to water out; In the described first order, press in heater 7 and the described first order and press between heater 7 outlets drain water piping 26 is set, described drain water piping 26 arranges middle pressure drainage pump 27, in the described first order, press the hydrophobic by middle pressure drainage pump 27 of heater 7, by drain water piping 26 dredge to press in the described first order heater 7 to water out; Realize a kind of feedwater backheat of the present invention and draining system.
Embodiment six
Further, as shown in Figure 8, be another specific embodiment of the present invention, comprise the low-pressure heater 1, oxygen-eliminating device 2, fore pump 3, middle pressure heater, feed pump 5, the high-pressure heater 6 that by feedwater piping 10, are connected successively; The number of described middle pressure heater is two; Along feedwater direction, be divided into pressing in the first order and in pressurizer 7 and the second level, press heater 4; In described high-pressure heater 6 and the described second level, press between the outlet of heater 4 drain water piping 29 is set, the hydrophobic of described high-pressure heater 6 dredged to the outlet of pressing heater 4 in the described second level by drain water piping 29; In the described second level, press in heater 4 and the described second level and press between heater 4 outlets drain water piping 24 is set, described drain water piping 24 arranges middle pressure drainage pump 25, in the described second level, press the hydrophobic by middle pressure drainage pump 25 of heater 4, by drain water piping 24 dredge to press in the described second level heater 4 to water out; In the described first order, press between heater 7 and described oxygen-eliminating device 2 drain water piping 30 is set, in the described first order, press the hydrophobic of heater 7 to dredge to described oxygen-eliminating device by drain water piping 30; Realize a kind of feedwater backheat of the present invention and draining system.
Should be noted that, below just enumerated the preferred embodiment while pressing heaters to be two in the middle of several, in conjunction with traditional heater cascaded drain gravity flow mode, and middle pressure heater is dredged to the outlet of corresponding middle pressure heater by drainage pump, the modes such as number of middle pressure heater, can make corresponding changes, similarly embodiment all reduces the pressure energy loss of squeezing and reduce high-pressure heater water that heater draws gas to subordinate in itself, and then the cost of reduction heater, thereby all above-mentioned backheat modes at fore pump and feed pump intermediate arrangement heater all measures of reducing the hydrophobic pressure loss of high-pressure heater are all because of in the present invention protects context.
Claims (7)
1. feedwater backheat and a draining system, 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; 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.
2. feedwater backheat and the draining system as described in right item 1, wherein, described being arranged on the drain water piping between described middle pressure heater and described middle pressure heater outlet feedwater piping arranges middle pressure drainage pump, described middle pressure heater hydrophobic by drainage pump, by be arranged on described in drain water piping between pressure heater and described middle pressure heater outlet feedwater piping dredge to described middle pressure heater to water out.
3. a kind of feedwater backheat as claimed in claim 2 and draining system, is characterized in that, described feedwater piping is also provided with the oxygen-eliminating device that is positioned at described fore pump front end.
4. a kind of feedwater backheat as claimed in claim 3 and draining system, 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 the drain water piping being arranged between middle pressure heater and described oxygen-eliminating device import.
5. a kind of feedwater backheat as claimed in claim 4 and draining system, 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.
6. a kind of feedwater backheat as claimed in claim 5 and draining system, is characterized in that, the number of described middle pressure heater at least one, between described high-pressure heater and adjacent middle pressure heater outlet, drain water piping is set.
7. a kind of feedwater backheat as claimed in claim 6 and draining system, 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 |
|---|---|---|---|
| CN201310264512.4A CN104110676B (en) | 2013-04-19 | 2013-06-27 | A kind of feedwater backheat and draining system |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310139776 | 2013-04-19 | ||
| CN2013101397767 | 2013-04-19 | ||
| CN201310139776.7 | 2013-04-19 | ||
| CN201310264512.4A CN104110676B (en) | 2013-04-19 | 2013-06-27 | A kind of feedwater backheat and draining system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104110676A true CN104110676A (en) | 2014-10-22 |
| CN104110676B CN104110676B (en) | 2017-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 |
| CN201320376138.2U Expired - Lifetime CN203404768U (en) | 2013-04-19 | 2013-06-27 | Feed water heat regenerative and draining system with media-pressure heater |
| CN201310264512.4A Active CN104110676B (en) | 2013-04-19 | 2013-06-27 | A kind of feedwater backheat and draining system |
Family Applications Before (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 |
| CN201320376138.2U Expired - Lifetime CN203404768U (en) | 2013-04-19 | 2013-06-27 | Feed water heat regenerative and draining system with media-pressure heater |
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| CN (5) | CN203404770U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175664A (en) * | 2021-04-19 | 2021-07-27 | 西安交通大学 | Recycling device and method for mixed working medium of feed water heating system |
Families Citing this family (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 |
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- 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
- 2013-06-27 CN CN201320376138.2U patent/CN203404768U/en not_active Expired - Lifetime
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113175664A (en) * | 2021-04-19 | 2021-07-27 | 西安交通大学 | Recycling device and method for mixed working medium of feed water heating system |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN203404770U (en) | 2014-01-22 |
| CN203404768U (en) | 2014-01-22 |
| CN203395908U (en) | 2014-01-15 |
| CN104110676B (en) | 2017-03-08 |
| CN203404769U (en) | 2014-01-22 |
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