CN104976608B - It is a kind of to heat hydrophobic power plant boiler smoke waste heat recovery system - Google Patents
It is a kind of to heat hydrophobic power plant boiler smoke waste heat recovery system Download PDFInfo
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- CN104976608B CN104976608B CN201510344982.0A CN201510344982A CN104976608B CN 104976608 B CN104976608 B CN 104976608B CN 201510344982 A CN201510344982 A CN 201510344982A CN 104976608 B CN104976608 B CN 104976608B
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Abstract
A kind of power plant boiler smoke waste heat recovery system, it is made up of bleeder heater, the first pipeline, the second pipeline, feed pipe, low-level (stack-gas) economizer and return pipe, the first pipeline is connected on the condensate pipe before bleeder heater entrance；The hydrophobic outlet of bleeder heater connects the second pipeline, first pipeline and the second pipeline merge into feed pipe, feed pipe connects the entrance of low-level (stack-gas) economizer, the outlet of low-level (stack-gas) economizer connects condensate pipe by return pipe, low-level (stack-gas) economizer and draining system are dexterously combined, the heat-economy of system is improved, reduces the manufacturing cost of bleeder heater.
Description
Technical field
The present invention relates to a kind of boiler exhaust gas residual neat recovering system, particularly a kind of heating fired power generating unit low pressure heat regenerative system
Hydrophobic and condensate boiler exhaust gas residual neat recovering 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
120 DEG C or so, corresponding heat loss due to exhaust gas accounts for 5% or so of boiler oil thermal discharge.Exhaust gas temperature raises, its heat of discharging fume
Loss also increases, and not only wastes the energy, can also make the increase of desulphurization system water consumption.To improve the performance driving economy of power plant, in recent years
To utilize the low-level (stack-gas) economizer technology of boiler exhaust gas waste-heat condensate to be widely used in China's Thermal Power Enterprises.
The existing hydrophobic connected mode of fired power generating unit has hydrophobic gravity flow step by step and uses drainage pump two ways, respectively such as Fig. 1
And shown in Fig. 2.In low pressure bleeder heater, extracted steam from turbine 9, condensate 10 and hydrophobic 11 are respectively connected to.Using hydrophobic in Fig. 1
Although mode system of flowing automatically step by step and equipment are simple, because hydrophobic temperature is higher, hydrophobic gravity flow step by step enters after subordinate not
System heat-economy can decline in which can avoid；And using in Fig. 2 can be made full use of hydrophobic access condensate using drainage pump
The heat to draw gas, its heat-economy is preferable, but adds system investments using drainage pump, and is saved currently without using low temperature
Coal device heats hydrophobic related implementation technology.
The content of the invention
In order to preferably improve the heat-economy for improving power plant boiler smoke waste heat recovery system, the present invention proposes to use
Fired power generating unit low pressure heat regenerative system is hydrophobic and the scheme of condensate for low-level (stack-gas) economizer heating.
To achieve the above object, the present invention takes following design：
A kind of power plant boiler smoke waste heat recovery system, by bleeder heater, the first pipeline, the second pipeline, feed pipe,
Low-level (stack-gas) economizer and return pipe composition, it is characterised in that：The first pipeline is connected on condensate pipe before bleeder heater entrance；
The hydrophobic outlet of bleeder heater connects the second pipeline, and the first pipeline and the second pipeline merge into feed pipe, and feed pipe connection is low
The entrance of warm economizer, the outlet of low-level (stack-gas) economizer connect condensate pipe by return pipe, and low-level (stack-gas) economizer is arranged in flue.
Further, condensation water regulating valve is provided with the first pipeline, hydrophobic switching valve is provided with the second pipeline.
Further, water regulating valve is condensed using manually or electrically regulating valve, and hydrophobic switching valve is using manually or electrically two
Position three-way switch valve.
Further, it is provided with drainage pump on the second pipeline.
Further, it is hydrophobic using hydrophobic switching Vavle switching using condensate governor valve control low-level (stack-gas) economizer output
Access low-level (stack-gas) economizer or hydrophobic gravity flow.
It is an advantage of the invention that：Low-level (stack-gas) economizer and draining system are dexterously tied in the premise for not increasing investment and equipment
Altogether, the heat-economy of system is improved, reduces the manufacturing cost of bleeder heater.
Brief description of the drawings
Fig. 1 is the existing hydrophobic mode system diagram that flows automatically step by step.
Fig. 2 is existing hydrophobic pump mode system diagram.
Fig. 3 is system structure diagram.
In figure：Hydrophobic switching valve 1, drainage pump 2, condense water regulating valve 3, feed pipe 4, low-level (stack-gas) economizer 5, return pipe 6, return
Hot heater 7, flue 8, extracted steam from turbine 9, condensate 10, hydrophobic 11
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail, it will be appreciated that content described herein is merely to illustrate
It is of the invention with explaining, it is not intended to limit the present invention.
As shown in figure 3, boiler exhaust gas residual neat recovering system is by drainage pump 2, hydrophobic switching valve 1, condensation water regulating valve 3, confession
Water pipe 4, low-level (stack-gas) economizer 5 and return pipe 6 form；Condensate tune is connected with condensate pipe before the entrance of bleeder heater 7
Valve 3 is saved, hydrophobic switching valve 1 and drainage pump 2 are connected on the drain pipe of bleeder heater 7；Condense the downstream pipe of water regulating valve 3
Feed pipe 4 is merged into the downstream pipe of drainage pump 2, feed pipe 4 connects the entrance of low-level (stack-gas) economizer 5, and low-level (stack-gas) economizer 5 goes out
Mouth passes through return pipe 6 and connects condensate pipe.Low-level (stack-gas) economizer is arranged in flue 8.In this boiler exhaust gas residual neat recovering system,
Bleeder heater it is hydrophobic through hydrophobic switching valve 1 and drainage pump 2, mixed, fed with the condensate through condensing water regulating valve 3
Low-level (stack-gas) economizer, condensate system is returned to after heating.
Because the optimal output of low-level (stack-gas) economizer is 40% or so of unit condensing water flow, more than bleeder heater
Hydrophobic flow；To meet the water supply requirement of low-level (stack-gas) economizer, partial coagulation water is sent into water supply line by condensing water regulating valve 3
Mixed with hydrophobic；Because the hydrophobic pressure of low pressure bleeder heater 7 is relatively low, it is necessary to set drainage pump 2 to be pressurized it.It is hydrophobic
Switching valve 1 uses two-bit triplet switching valve, can switch between hydrophobic access low-level (stack-gas) economizer system or hydrophobic gravity flow two ways,
Can be manual or automatically controlled.Condense water regulating valve 3 and use manual or electric controlled regulating valve, the condensing water flow flowed through can be adjusted,
In hydrophobic access low-level (stack-gas) economizer system or hydrophobic gravity flow two ways, water regulating valve is condensed by adjusting, control flows into low
The output of warm economizer.
As stated in the Background Art, the hydrophobic connected mode of fired power generating unit has hydrophobic gravity flow and drainage pump two ways step by step, and
Heat-economy using hydrophobic pump mode is preferable.By the way that low-level (stack-gas) economizer system is combined with draining system optimization, can both lead to
Cross low temperature economizer system and recycle fume afterheat, the efficient utilization of hydrophobic heat can be realized again, so as to improve system
Heat-economy.
In addition by the hydrophobic scheme by being pumped into low-level (stack-gas) economizer, do not increasing the premise of equipment investment and more exchange device
Down by redesigning water route, low-level (stack-gas) economizer and draining system are combined, which part condensate is adjusted by condensate
Section valve 3 enters low-level (stack-gas) economizer, also reduces the condensing water flow of this grade of bleeder heater, bears the heat of this grade of bleeder heater
Lotus reduces, and so as to reduce draw gas amount of this grade of bleeder heater from steam turbine, make use of the waste heat of flue gas to a greater extent.
Further, after using the present invention, the bleeder heater 7 being connected with hydrophobic switching valve 1 can no longer need to set
Hydrophobic cooling section is put, can both reduce the manufacturing cost of bleeder heater, can further improve the heat-economy of system again.
Research shows, machine can be reduced than the hydrophobic mode of gravity flow step by step using the hydrophobic connected mode of the bleeder heater of drainage pump
Group coa consumption rate 0.2g/kWh or so, by taking 600MW units as an example, can save about 500 tons of standard coal more every year.Therefore shown in Fig. 2
System heat-economy is higher than existing low-level (stack-gas) economizer heat-setting water system.
Compared with existing pair of boiler exhaust gas residual neat recovering system, advantages of the present invention is：
(1) heat-economy of system is significantly improved；
(2) manufacturing cost of bleeder heater can be reduced.
Finally it should be noted that：The explanation of the present invention is the foregoing is only, is not intended to limit the invention, although to this hair
Bright to be described in detail, for those skilled in the art, it still can be to foregoing described technical scheme
Modify, or equivalent substitution is carried out to which part technical characteristic.Within the spirit and principles of the invention, made
Any modification, equivalent substitution and improvements etc., should be included in the scope of the protection.
Claims (5)
- A kind of 1. power plant boiler smoke waste heat recovery system, by the first bleeder heater, the second bleeder heater, the first pipe Road, the second pipeline, feed pipe, low-level (stack-gas) economizer and return pipe composition, it is characterised in that：First bleeder heater, the second backheat Heater is sequentially connected in series along condensate flow direction on condensate pipe；On condensate pipe before the second bleeder heater entrance Connect the first pipeline；The hydrophobic outlet of second bleeder heater connects the second pipeline, and the first pipeline and the second pipeline merge into confession Water pipe, feed pipe connect the entrance of low-level (stack-gas) economizer, and the outlet of low-level (stack-gas) economizer is connected to the first backheat by return pipe and heated Condensate pipe before device entrance, low-level (stack-gas) economizer are arranged in flue.
- 2. power plant boiler smoke waste heat recovery system according to claim 1, it is characterised in that：It is provided with first pipeline Water regulating valve is condensed, hydrophobic switching valve is provided with the second pipeline.
- 3. power plant boiler smoke waste heat recovery system according to claim 2, it is characterised in that：Water regulating valve is condensed to use Manually or electrically regulating valve, hydrophobic switching valve is using manually or electrically two-bit triplet switching valve.
- 4. power plant boiler smoke waste heat recovery system according to claim 1, it is characterised in that：It is provided with second pipeline Drainage pump.
- 5. power plant boiler smoke waste heat recovery system according to claim 3, it is characterised in that：Using condensing water regulating valve Low-level (stack-gas) economizer output is controlled, utilizes the hydrophobic access low-level (stack-gas) economizer of hydrophobic switching Vavle switching 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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
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| CN104976608A CN104976608A (en) | 2015-10-14 |
| CN104976608B true 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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| CN104976608A (en) | 2015-10-14 |
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