CN104976608A - Exhaust smoke waste heat recycling system for drain water heating thermal power plant boiler - Google Patents
Exhaust smoke waste heat recycling system for drain water heating thermal power plant boiler Download PDFInfo
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- CN104976608A CN104976608A CN201510344982.0A CN201510344982A CN104976608A CN 104976608 A CN104976608 A CN 104976608A CN 201510344982 A CN201510344982 A CN 201510344982A CN 104976608 A CN104976608 A CN 104976608A
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Abstract
An exhaust smoke waste heat recycling system for a thermal power plant boiler is composed of a backheating heater, a first pipeline, a second pipeline, a water supply pipe, a low-temperature coal economizer and a water returning pipe. The first pipeline is connected to a condensate water pipe in front of an inlet of the backheating heater; a drain water outlet of the backheating heater is connected with the second pipeline; the first pipeline and the second pipeline are combined into the water supply pipe, and the water supply pipe is connected with an inlet of the low-temperature coal economizer; an outlet of the low-temperature coal economizer is connected with the condensate water pipe through the water returning pipe; the low-temperature coal economizer and a drain water system are ingeniously combined together, heat economy of the system is improved, and the manufacturing cost of the backheating heater is reduced.
Description
Technical field
The present invention relates to a kind of boiler exhaust gas residual neat recovering system, particularly a kind of boiler exhaust gas residual neat recovering system heating the hydrophobic and condensate water of fired power generating unit low pressure heat regenerative system.
Background technology
Heat loss due to exhaust gas is the main heat loss of power plant boiler.Modern Large-scale fire-electricity unit boiler design smoke evacuation temperature is about about 120 DEG C, and corresponding heat loss due to exhaust gas accounts for about 5% of boiler oil thermal discharge.Exhaust gas temperature raises, and its heat loss due to exhaust gas also increases, and not only wastes energy, and desulphurization system water consumption also can be made to increase.For improving the performance driving economy of power plant, the low-level (stack-gas) economizer technology of boiler exhaust gas waste-heat condensate water is utilized to be widely used at China's Thermal Power Enterprises in recent years.
The hydrophobic connected mode of existing fired power generating unit has hydrophobicly flows automatically step by step and adopts drainage pump two kinds of modes, respectively as shown in Figures 1 and 2.At low pressure bleeder heater, access extracted steam from turbine 9, condensate water 10 and hydrophobic 11 respectively.Although adopt in Fig. 1 hydrophobic flow automatically step by step mode system and equipment simple, because hydrophobic temperature is higher, hydrophobicly inevitably make system heat-economy decline after gravity flow enters subordinate step by step; And adopt in Fig. 2 and utilize drainage pump hydrophobic access condensate water can be made full use of the heat drawn gas, its heat-economy is better, but adopts drainage pump to add system investments, and is not utilizing low-level (stack-gas) economizer to add the relevant enforcement technology of thermal drain at present.
Summary of the invention
In order to improve the heat-economy of power plant boiler smoke waste heat recovery system better, the present invention proposes to adopt the scheme of the hydrophobic and condensate water of low-level (stack-gas) economizer heating fired power generating unit low pressure heat regenerative system.
For achieving the above object, the present invention takes following design:
A kind of power plant boiler smoke waste heat recovery system, is made up of bleeder heater, the first pipeline, the second pipeline, feed pipe, low-level (stack-gas) economizer and return pipe, it is characterized in that: the condensate pipe before bleeder heater entrance connects the first pipeline; Hydrophobic outlet connection second pipeline of bleeder heater, the first pipeline and the second pipeline merge into feed pipe, and feed pipe connects the entrance of low-level (stack-gas) economizer, and the outlet of low-level (stack-gas) economizer connects condensate pipe by return pipe, and low-level (stack-gas) economizer is arranged in flue.
Further, the first pipeline is provided with condensate water control valve, the second pipeline is provided with hydrophobic transfer valve.
Further, condensate water control valve adopts manually or electric control valve, and hydrophobic transfer valve adopts manual or electronic two-bit triplet transfer valve.
Further, the second pipeline is provided with drainage pump.
Further, utilize condensate water governor valve control low-level (stack-gas) economizer output, utilize hydrophobic transfer valve to switch hydrophobic access low-level (stack-gas) economizer or hydrophobic gravity flow.
Advantage of the present invention is: low-level (stack-gas) economizer and draining system are combined dexterously in the prerequisite not increasing investment and equipment, improve the heat-economy of system, reduces the manufacturing cost of bleeder heater.
Accompanying drawing explanation
Fig. 1 is the existing hydrophobic mode system diagram that flows automatically step by step.
Fig. 2 is existing drainage pump mode system diagram.
Fig. 3 is system architecture schematic diagram.
In figure: hydrophobic transfer valve 1, drainage pump 2, condensate water control valve 3, feed pipe 4, low-level (stack-gas) economizer 5, return pipe 6, bleeder heater 7, flue 8, extracted steam from turbine 9, condensate water 10, hydrophobic 11
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail, should be appreciated that content described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
As shown in Figure 3, boiler exhaust gas residual neat recovering system is made up of drainage pump 2, hydrophobic transfer valve 1, condensate water control valve 3, feed pipe 4, low-level (stack-gas) economizer 5 and return pipe 6; Condensate pipe before bleeder heater 7 entrance is connected with condensate water control valve 3, the drain pipe of bleeder heater 7 connects hydrophobic transfer valve 1 and drainage pump 2; The downstream pipe of condensate water control valve 3 and the downstream pipe of drainage pump 2 merge into feed pipe 4, and feed pipe 4 connects the entrance of low-level (stack-gas) economizer 5, and the outlet of low-level (stack-gas) economizer 5 connects condensate pipe by return pipe 6.Low-level (stack-gas) economizer is arranged in flue 8.In this boiler exhaust gas residual neat recovering system, the hydrophobic of bleeder heater mixes with the condensate water through condensate water control valve 3 through hydrophobic transfer valve 1 and drainage pump 2, feeds low-level (stack-gas) economizer, returns condensate system after heating.
Because the best output of low-level (stack-gas) economizer is about 40% of unit condensing water flow, be greater than the hydrophobic flow of bleeder heater; For meeting the water supply requirement of low-level (stack-gas) economizer, partial coagulation water being sent into water supply line by condensate water control valve 3 and mixes with hydrophobic; Because the hydrophobic pressure of low pressure bleeder heater 7 is lower, needing, drainage pump 2 is set supercharging is carried out to it.Hydrophobic transfer valve 1 adopts two-bit triplet transfer valve, can switch between hydrophobic access low-level (stack-gas) economizer system or hydrophobic gravity flow two kinds of modes, can be manual or automatically controlled.Condensate water control valve 3 adopts manually or electric controlled regulating valve, can regulate the condensing water flow flowed through, and when hydrophobic access low-level (stack-gas) economizer system or hydrophobic gravity flow two kinds of modes, by regulating condensate water control valve, controls the output flowing into low-level (stack-gas) economizer.
As stated in the Background Art, the hydrophobic connected mode of fired power generating unit has hydrophobic gravity flow and drainage pump two kinds of modes step by step, and adopts the heat-economy of drainage pump mode better.By low-level (stack-gas) economizer system being combined with draining system optimization, both utilizing fume afterheat by low-level (stack-gas) economizer system recoveries, the efficiency utilization of hydrophobic heat can be realized again, thus improve the heat-economy of system.
In addition by the hydrophobic scheme by being pumped into low-level (stack-gas) economizer, by redesigning water route under the prerequisite not increasing equipment investment and more exchange device, low-level (stack-gas) economizer and draining system are combined, wherein partial coagulation water enters low-level (stack-gas) economizer by condensate water control valve 3, also reduce the condensing water flow of bleeder heater at the corresponding levels, the thermic load of bleeder heater at the corresponding levels is reduced, thus reduces the draw gas amount of bleeder heater at the corresponding levels from steam turbine, make use of the waste heat of flue gas to a greater extent.
Further, after adopting the present invention, the bleeder heater 7 be connected with hydrophobic transfer valve 1 can no longer need to arrange hydrophobic cooling section, both can reduce the manufacturing cost of bleeder heater, can further improve again the heat-economy of system.
Research shows, adopts the hydrophobic connected mode of bleeder heater of drainage pump can reduce unit coa consumption rate about 0.2g/kWh than hydrophobic mode of flowing automatically step by step, for 600MW unit, more piece can be about standard coal about 500 tons every year.Therefore the system heat-economy shown in Fig. 2 is higher than existing low-level (stack-gas) economizer heat-setting water system.
Compared with existing right boiler exhaust gas residual neat recovering system, advantage of the present invention is:
(1) heat-economy of system is significantly improved;
(2) manufacturing cost of bleeder heater can be reduced.
Last it is noted that the foregoing is only explanation of the present invention, be not limited to the present invention, although to invention has been detailed description, for a person skilled in the art, it still can be modified to aforementioned described technical scheme, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a power plant boiler smoke waste heat recovery system, is made up of bleeder heater, the first pipeline, the second pipeline, feed pipe, low-level (stack-gas) economizer and return pipe, it is characterized in that: the condensate pipe before bleeder heater entrance connects the first pipeline; Hydrophobic outlet connection second pipeline of bleeder heater, the first pipeline and the second pipeline merge into feed pipe, and feed pipe connects the entrance of low-level (stack-gas) economizer, and the outlet of low-level (stack-gas) economizer connects condensate pipe by return pipe, and low-level (stack-gas) economizer is arranged in flue.
2. power plant boiler smoke waste heat recovery system according to claim 1, is characterized in that: the first pipeline is provided with condensate water control valve, the second pipeline is provided with hydrophobic transfer valve.
3. power plant boiler smoke waste heat recovery system according to claim 2, is characterized in that: condensate water control valve adopts manually or electric control valve, and hydrophobic transfer valve adopts manual or electronic two-bit triplet transfer valve.
4. power plant boiler smoke waste heat recovery system according to claim 1, is characterized in that: the second pipeline is provided with drainage pump.
5. power plant boiler smoke waste heat recovery system according to claim 3, is characterized in that: utilize condensate water governor valve control low-level (stack-gas) economizer output, utilizes hydrophobic transfer valve to switch hydrophobic access low-level (stack-gas) economizer or hydrophobic gravity flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510344982.0A CN104976608B (en) | 2015-06-17 | 2015-06-17 | It is a kind of to heat hydrophobic power plant boiler smoke waste heat recovery system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510344982.0A CN104976608B (en) | 2015-06-17 | 2015-06-17 | It is a kind of to heat hydrophobic power plant boiler smoke waste heat recovery system |
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| CN104976608A true CN104976608A (en) | 2015-10-14 |
| CN104976608B CN104976608B (en) | 2018-02-16 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090360A (en) * | 2011-11-02 | 2013-05-08 | 李建锋 | Energy recovery method of thermal power plant heat regenerative system |
| CN103256644A (en) * | 2013-04-11 | 2013-08-21 | 杭州锅炉集团股份有限公司 | Low-pressure expanded economizer system |
| CN203605209U (en) * | 2013-10-16 | 2014-05-21 | 济南达能动力技术有限责任公司 | Pump-less self-circulating-type low-pressure economizer system |
| CN204201868U (en) * | 2014-10-02 | 2015-03-11 | 大唐(北京)能源管理有限公司 | A kind of boiler exhaust gas residual neat recovering system |
| CN204901728U (en) * | 2015-06-17 | 2015-12-23 | 大唐(北京)能源管理有限公司 | Heat hydrophobous fiery power boiler waste heat recovery system of discharging fume |
-
2015
- 2015-06-17 CN CN201510344982.0A patent/CN104976608B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090360A (en) * | 2011-11-02 | 2013-05-08 | 李建锋 | Energy recovery method of thermal power plant heat regenerative system |
| CN103256644A (en) * | 2013-04-11 | 2013-08-21 | 杭州锅炉集团股份有限公司 | Low-pressure expanded economizer system |
| CN203605209U (en) * | 2013-10-16 | 2014-05-21 | 济南达能动力技术有限责任公司 | Pump-less self-circulating-type low-pressure economizer system |
| CN204201868U (en) * | 2014-10-02 | 2015-03-11 | 大唐(北京)能源管理有限公司 | A kind of boiler exhaust gas residual neat recovering system |
| CN204901728U (en) * | 2015-06-17 | 2015-12-23 | 大唐(北京)能源管理有限公司 | Heat hydrophobous fiery power boiler waste heat recovery system of discharging fume |
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| CN104976608B (en) | 2018-02-16 |
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