CN103836610B - A kind of hydrophobic heating system of heat supply network improving thermal power plant unit economy - Google Patents

A kind of hydrophobic heating system of heat supply network improving thermal power plant unit economy Download PDF

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Publication number
CN103836610B
CN103836610B CN201410078218.9A CN201410078218A CN103836610B CN 103836610 B CN103836610 B CN 103836610B CN 201410078218 A CN201410078218 A CN 201410078218A CN 103836610 B CN103836610 B CN 103836610B
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hydrophobic
pipe
heater
supply network
heat supply
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CN103836610A (en
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孙士恩
俞聪
郑立军
陈志刚
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Huadian Electric Power Research Institute Co Ltd
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Huadian Electric Power Research Institute Co Ltd
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Abstract

The present invention relates to a kind of hydrophobic heating system of heat supply network improving thermal power plant unit economy.Also there is no the obvious hydrophobic heating system of a kind of effects of energy saving and emission reduction at present.The present invention includes heat exchangers for district heating, drainage pump, low-pressure heater at the corresponding levels, even lower level low-pressure heater, extracted steam from turbine pipe at the corresponding levels and condensate water inlet pipe at the corresponding levels, be characterized in: also comprise hydrophobic heater, heat supply network return branch, heat supply network water supply arm, hydrophobic inlet pipe, hydrophobic go out pipe, hydrophobic heater by-pass, drain pipe, hydrophobic pipe valve and bypass valve, the two ends of hydrophobic inlet pipe are connected on heat exchangers for district heating and hydrophobic heater, hydrophobic go out the two ends of pipe be connected on hydrophobic heater and condensate water inlet pipe at the corresponding levels, bypass valve is arranged on hydrophobic heater by-pass, the two ends of heat supply network return branch are connected on hydrophobic heater and heat supply network return main, the two ends of heat supply network water supply arm are connected on hydrophobic heater and heat supply network water main.Reasonable in design of the present invention, effects of energy saving and emission reduction is obvious.

Description

A kind of hydrophobic heating system of heat supply network improving thermal power plant unit economy
Technical field
The present invention relates to the hydrophobic heating system of a kind of heat supply network, especially a kind of hydrophobic heating system of heat supply network improving thermal power plant unit economy is related to, belong to steam power plant's extraction for heat supply system regions, can be widely used in steam power plant's heat supply network heating system, be particularly useful for the steam power plant of lower, the larger central heating system of heat supply network return water temperature.
Background technology
In the last few years, along with national energy-saving reduces discharging the continuous increase of enforcement dynamics, the pressure suffered by power system was also increasing; In addition, along with the development of concentrated supply of heating in the city, the area of heat-supply service that steam power plant receives is increasing, how to improve the output value of specific energy consumption, becomes the problem that steam power plant is in the urgent need to address.The heat exchangers for district heating of steam power plant's heat supply initial station does not generally all arrange hydrophobic cooling section, design drain temperature is the saturation temperature that extraction pressure is corresponding, and because heat supply network return water temperature is very low in actual motion, general between 30 DEG C-60 DEG C, make hydrophobic existence necessarily excessively cold, and degree of supercooling fluctuate along with return water temperature, drain temperature is generally at about 90 DEG C, drain approach is between 30 DEG C-60 DEG C, and the heat exchange of the so large temperature difference causes huge irreversible loss, and hydrophobic sensible heat is inabundant for external heat supply.
If publication date is on 07 24th, 2013, publication number is in the Chinese patent of CN203082865U, disclose a kind of overcritical heating unit heat exchangers for district heating drainage recovering device, it comprises at least one heat exchangers for district heating, the hydrophobic outlet conduit of each heat exchangers for district heating is established conductivity apparatus and heat exchangers for district heating drainage pump, the boosting of heat exchangers for district heating drainage pump is delivered to condensing water conduit through tramp iron separator and enters oxygen-eliminating device, although it can solve overcritical heating unit heat exchangers for district heating drain recovery and heat recovery, improve the performance driving economy of unit, but its complex structure, the required cost dropped into of equipment is high.And for example publication date is on 01 02nd, 2013, publication number is in the Chinese patent of CN202647719U, disclose a kind of subcritical clammy thermal power plant unit heat supply network hydrophobic treatment system, it comprises condenser, low-pressure heater, heat exchangers for district heating and oxygen-eliminating device, hydrophobic cooling section is provided with in heat exchangers for district heating, the condensate water that condenser exports enters oxygen-eliminating device by condensing water conduit through some groups of low-pressure heaters, from steam turbine export steam generate after heat exchangers for district heating heat exchange hydrophobic through the condensing water conduit that drain water piping is delivered to before final stage low-pressure heater, economy is remarkable not.
In sum, also do not have one can reclaim the hydrophobic sensible heat of heat exchangers for district heating at present, reduce the irreversible loss in heat transfer process, high-grade heating is replaced to draw gas with relatively low-grade drawing gas, reduce high-grade to draw gas consumption, increase steam turbine acting ability, improve the thermal efficiency of unit, the obvious hydrophobic heating system of effects of energy saving and emission reduction.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, and a kind of reasonable in design is provided, the hydrophobic sensible heat of heat exchangers for district heating can be reclaimed, reduce the irreversible loss in heat transfer process, replace high-grade heating to draw gas with relatively low-grade drawing gas, reduce high-grade and to draw gas consumption, increase steam turbine acting ability, improve the thermal efficiency of unit, effects of energy saving and emission reduction significantly improves the hydrophobic heating system of heat supply network of thermal power plant unit economy.
The present invention's adopted technical scheme that solves the problem is: the hydrophobic heating system of heat supply network of this raising thermal power plant unit economy comprises heat exchangers for district heating, drainage pump, low-pressure heater at the corresponding levels, even lower level low-pressure heater, extracted steam from turbine pipe at the corresponding levels, heat supply network return main, heat supply network water main, even lower level extracted steam from turbine pipe, even lower level condensate water inlet pipe and condensate water inlet pipe at the corresponding levels, described heat supply network return main and heat supply network water main are all connected on heat exchangers for district heating, described extracted steam from turbine pipe at the corresponding levels is connected on heat exchangers for district heating and low-pressure heater at the corresponding levels, described even lower level extracted steam from turbine pipe and even lower level condensate water inlet pipe are all connected on even lower level low-pressure heater, the two ends of described condensate water inlet pipe at the corresponding levels are connected on low-pressure heater at the corresponding levels and even lower level low-pressure heater, its design feature is: also comprise hydrophobic heater, heat supply network return branch, heat supply network water supply arm, hydrophobic inlet pipe, hydrophobic go out pipe, hydrophobic heater by-pass, drain pipe, hydrophobic pipe valve and bypass valve, the two ends of described hydrophobic inlet pipe are connected on heat exchangers for district heating and hydrophobic heater, described hydrophobic go out the two ends of pipe be connected on hydrophobic heater and condensate water inlet pipe at the corresponding levels, one end of described hydrophobic heater by-pass be connected to hydrophobic go out on pipe, the other end of this hydrophobic heater by-pass is connected on hydrophobic inlet pipe, described bypass valve is arranged on hydrophobic heater by-pass, the two ends of described heat supply network return branch are connected on hydrophobic heater and heat supply network return main, the two ends of described heat supply network water supply arm are connected on hydrophobic heater and heat supply network water main, one end of described drain pipe be connected to hydrophobic go out on pipe, the other end of this drain pipe is connected on even lower level condensate water inlet pipe, described drainage pump and hydrophobic pipe valve be installed in hydrophobic go out on pipe, one end of described hydrophobic heater by-pass, drainage pump, one end of drain pipe and hydrophobic pipe valve along hydrophobic go out pipe be arranged in order.Make structure of the present invention simple, reasonable in design thus, according to cascaded utilization of energy principle, the hydrophobic sensible heat of heat exchangers for district heating can be reclaimed, reduce the irreversible loss in heat transfer process, effectively can improve the thermal efficiency of unit.
As preferably, the relative altitude position of heat exchangers for district heating of the present invention, hydrophobic heater and drainage pump reduces successively.The hydrophobic discrepancy in elevation that can utilize is made to flow automatically in drainage pump thus.
As preferably, hydrophobic heater of the present invention is plate type heat exchanger or shell-and-tube heat exchanger.
As preferably, the present invention also comprises drain valve, and described drain valve is arranged on drain pipe.
The present invention compared with prior art, have the following advantages and effect: hydrophobic heater reclaims the hydrophobic sensible heat of heat exchangers for district heating to heat low temperature heat supply network backwater, recycle more low-grade extracted steam from turbine and add thermal drain, thus reduce high-grade extracted steam from turbine consumption, improve the thermal efficiency of unit.Calculating shows, the present invention is to reception 5,000,000 m 2the 300MW grade steam extraction heat supply unit of heating area, Heating Season gross coal consumption rate declines about 1g/kWh, and effects of energy saving and emission reduction is obvious.
Accompanying drawing explanation
Fig. 1 is the structural representation of the hydrophobic heating system of heat supply network improving thermal power plant unit economy in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment.
See Fig. 1, the hydrophobic heating system of heat supply network improving thermal power plant unit economy in the present embodiment comprises heat exchangers for district heating 1, drainage pump 2, low-pressure heater 3 at the corresponding levels, even lower level low-pressure heater 4, hydrophobic heater 5, extracted steam from turbine pipe 6 at the corresponding levels, heat supply network return main 7, heat supply network water main 8, heat supply network return branch 9, heat supply network water supply arm 10, hydrophobic inlet pipe 11, hydrophobic go out pipe 12, hydrophobic heater by-pass 13, drain pipe 14, even lower level extracted steam from turbine pipe 15, even lower level condensate water inlet pipe 16, condensate water inlet pipe 17 at the corresponding levels, hydrophobic pipe valve 18, bypass valve 19 and drain valve 20, wherein, the pattern of hydrophobic heater 5 is not limit, heater 5 as hydrophobic in this can be the pattern such as plate type heat exchanger or shell-and-tube heat exchanger.
Heat supply network return main 7 in the present embodiment and heat supply network water main 8 are all connected on heat exchangers for district heating 1, extracted steam from turbine pipe 6 at the corresponding levels is connected on heat exchangers for district heating 1 and low-pressure heater at the corresponding levels 3, even lower level extracted steam from turbine pipe 15 and even lower level condensate water inlet pipe 16 are all connected on even lower level low-pressure heater 4, and the two ends of condensate water inlet pipe 17 at the corresponding levels are connected on low-pressure heater 3 at the corresponding levels and even lower level low-pressure heater 4.
In the present embodiment, the two ends of hydrophobic inlet pipe 11 are connected on heat exchangers for district heating 1 and hydrophobic heater 5, hydrophobic go out the two ends of pipe 12 be connected on hydrophobic heater 5 and condensate water inlet pipe 17 at the corresponding levels, one end of hydrophobic heater by-pass 13 be connected to hydrophobic go out on pipe 12, the other end of this hydrophobic heater by-pass 13 is connected on hydrophobic inlet pipe 11, and bypass valve 19 is arranged on hydrophobic heater by-pass 13.
The two ends of the heat supply network return branch 9 in the present embodiment are connected on hydrophobic heater 5 and heat supply network return main 7, the two ends of heat supply network water supply arm 10 are connected on hydrophobic heater 5 and heat supply network water main 8, one end of drain pipe 14 be connected to hydrophobic go out on pipe 12, the other end of this drain pipe 14 is connected on even lower level condensate water inlet pipe 16, and drain valve 20 is arranged on drain pipe 14.
Drainage pump 2 in the present embodiment and hydrophobic pipe valve 18 be installed in hydrophobic go out on pipe 12, one end of one end of hydrophobic heater by-pass 13, drainage pump 2, drain pipe 14 and hydrophobic pipe valve 18 along hydrophobic go out pipe 12 be arranged in order, the relative altitude position of heat exchangers for district heating 1, hydrophobic heater 5 and drainage pump 2 reduces successively, and the hydrophobic discrepancy in elevation that can utilize is flowed automatically in drainage pump 2.
The hydrophobic heating system of heat supply network of thermal power plant unit economy is improved according to cascaded utilization of energy principle in the present embodiment, the hydrophobic sensible heat of heat exchangers for district heating 1 can be reclaimed, reduce the irreversible loss of heat transfer process, high-grade heating is replaced to draw gas with relatively low-grade drawing gas, reduce high-grade to draw gas consumption, increase steam turbine acting ability, improve the thermal efficiency of unit, effects of energy saving and emission reduction is obvious.A set of hydrophobic heater 5 is set between the hydrophobic outlet and hydrophobic 2 pumps of heat exchangers for district heating 1, the hydrophobic heating part heat supply network backwater that is used for.The entrance pipe of hydrophobic time low-pressure heater 3 at the corresponding levels arranges drain pipe 14 to even lower level low-pressure heater 4 entrance, and the pipeline of hydrophobic time low-pressure heater 3 at the corresponding levels is as subsequent use.
The hydrophobic of heat exchangers for district heating 1 is introduced into hydrophobic heater 5, heats a part of heat supply network backwater, under the prerequisite that the external heating load of steam power plant is constant, obviously can reduce heating and to draw gas consumption; Hydrophobic after heat exchange cooling sends steam turbine even lower level low-pressure heater 4 back to after drainage pump 2 boosts, and utilizes even lower level to draw gas first heat temperature raising, then enters low-pressure heater 3 at the corresponding levels and carry out heat temperature raising.By the way, achieve cascaded utilization of energy, namely the steam of high-quality draws gas multiple electricity less, and inferior steam draws gas the object of heating more, improves generatine set heat efficiency.
Hydrophobic for the heat supply network improving thermal power plant unit economy in the present embodiment heating system is applied in certain 300MW grade steam extraction heat supply unit heat supply network draining system, heat supply network return water temperature 50 DEG C, supply water temperature 86 DEG C, hot net water flow 6500t/h, five sections of (heating) pressure 0.155MPa.a that draw gas, heat exchangers for district heating drain temperature 95 DEG C, during six sections of extraction pressure 0.061MPa.a, following data are obtained: drain temperature can drop to 55 DEG C after calculating, six sections of consumption increase about 16t/h that draw gas, five sections of consumptions of drawing gas reduce about 15t/h, the water pump wasted work that deduction increases, Heating Season gross coal consumption rate decline 1g/kWh, Heating Season can save standard coal 900 tons, there is significant energy-saving and emission-reduction benefit.
In addition, it should be noted that, the specific embodiment described in this description, the shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this description is only to structure example of the present invention explanation.The equivalence change that structure, feature and the principle of all foundations described in inventional idea of the present invention are done or simple change, be included in the protection domain of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.

Claims (2)

1. one kind is improved the hydrophobic heating system of heat supply network of thermal power plant unit economy, comprise heat exchangers for district heating, drainage pump, low-pressure heater at the corresponding levels, even lower level low-pressure heater, extracted steam from turbine pipe at the corresponding levels, heat supply network return main, heat supply network water main, even lower level extracted steam from turbine pipe, even lower level condensate water inlet pipe and condensate water inlet pipe at the corresponding levels, described heat supply network return main and heat supply network water main are all connected on heat exchangers for district heating, described extracted steam from turbine pipe at the corresponding levels is connected on heat exchangers for district heating and low-pressure heater at the corresponding levels, described even lower level extracted steam from turbine pipe and even lower level condensate water inlet pipe are all connected on even lower level low-pressure heater, the two ends of described condensate water inlet pipe at the corresponding levels are connected on low-pressure heater at the corresponding levels and even lower level low-pressure heater, it is characterized in that: also comprise hydrophobic heater, heat supply network return branch, heat supply network water supply arm, hydrophobic inlet pipe, hydrophobic go out pipe, hydrophobic heater by-pass, drain pipe, hydrophobic pipe valve and bypass valve, the two ends of described hydrophobic inlet pipe are connected on heat exchangers for district heating and hydrophobic heater, described hydrophobic go out the two ends of pipe be connected on hydrophobic heater and condensate water inlet pipe at the corresponding levels, one end of described hydrophobic heater by-pass be connected to hydrophobic go out on pipe, the other end of this hydrophobic heater by-pass is connected on hydrophobic inlet pipe, described bypass valve is arranged on hydrophobic heater by-pass, the two ends of described heat supply network return branch are connected on hydrophobic heater and heat supply network return main, the two ends of described heat supply network water supply arm are connected on hydrophobic heater and heat supply network water main, one end of described drain pipe be connected to hydrophobic go out on pipe, the other end of this drain pipe is connected on even lower level condensate water inlet pipe, described drainage pump and hydrophobic pipe valve be installed in hydrophobic go out on pipe, one end of described hydrophobic heater by-pass, drainage pump, one end of drain pipe and hydrophobic pipe valve along hydrophobic go out pipe be arranged in order, the relative altitude position of described heat exchangers for district heating, hydrophobic heater and drainage pump reduces successively, reclaim the hydrophobic sensible heat of heat exchangers for district heating according to cascaded utilization of energy principle, reduce the irreversible loss in heat transfer process, effectively improve the thermal efficiency of unit, described hydrophobic heater is plate type heat exchanger or shell-and-tube heat exchanger.
2. the hydrophobic heating system of heat supply network of raising thermal power plant unit economy according to claim 1, it is characterized in that: also comprise drain valve, described drain valve is arranged on drain pipe.
CN201410078218.9A 2014-03-05 2014-03-05 A kind of hydrophobic heating system of heat supply network improving thermal power plant unit economy Active CN103836610B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001208890A (en) * 2000-01-27 2001-08-03 Toshiba Corp Feed water heater piping system for nuclear power plant
CN201748408U (en) * 2010-05-26 2011-02-16 中国电力工程顾问集团华北电力设计院工程有限公司 Supercritical heat supply network heater full-backheating drain water system in concurrent boiler thermal power plant
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CN202182458U (en) * 2011-06-30 2012-04-04 内蒙古电力勘测设计院 Heat-supply-network water drainage system of supercritical direct air-cooling heat supply unit
CN202371699U (en) * 2011-12-15 2012-08-08 中国电力工程顾问集团华北电力设计院工程有限公司 Secondary condensate pump system for supercritical heat supply unit
CN202647719U (en) * 2012-06-04 2013-01-02 河北省电力勘测设计研究院 Heating network drain treatment system for subcritical wet cooling heat supply unit
CN203050815U (en) * 2012-12-19 2013-07-10 杭州华电能源工程有限公司 Electric power plant waste heat recovery device based on absorption heat pump
CN203082865U (en) * 2012-12-21 2013-07-24 河南省电力勘测设计院 Heating network heater drain water recovery device of supercritical heating supply set
CN203249231U (en) * 2013-05-06 2013-10-23 中国电力工程顾问集团华东电力设计院 System using water drainage waste heat of heating network heater to heat raw water
CN203848272U (en) * 2014-03-05 2014-09-24 华电电力科学研究院 Heating-network dewatering and heating system of heat supply unit

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001208890A (en) * 2000-01-27 2001-08-03 Toshiba Corp Feed water heater piping system for nuclear power plant
CN201748408U (en) * 2010-05-26 2011-02-16 中国电力工程顾问集团华北电力设计院工程有限公司 Supercritical heat supply network heater full-backheating drain water system in concurrent boiler thermal power plant
CN202066096U (en) * 2011-05-31 2011-12-07 内蒙古电力勘测设计院 Supercritical direct air-cooling heat-supply network drainage system of heat supply unit
CN202182458U (en) * 2011-06-30 2012-04-04 内蒙古电力勘测设计院 Heat-supply-network water drainage system of supercritical direct air-cooling heat supply unit
CN202371699U (en) * 2011-12-15 2012-08-08 中国电力工程顾问集团华北电力设计院工程有限公司 Secondary condensate pump system for supercritical heat supply unit
CN202647719U (en) * 2012-06-04 2013-01-02 河北省电力勘测设计研究院 Heating network drain treatment system for subcritical wet cooling heat supply unit
CN203050815U (en) * 2012-12-19 2013-07-10 杭州华电能源工程有限公司 Electric power plant waste heat recovery device based on absorption heat pump
CN203082865U (en) * 2012-12-21 2013-07-24 河南省电力勘测设计院 Heating network heater drain water recovery device of supercritical heating supply set
CN203249231U (en) * 2013-05-06 2013-10-23 中国电力工程顾问集团华东电力设计院 System using water drainage waste heat of heating network heater to heat raw water
CN203848272U (en) * 2014-03-05 2014-09-24 华电电力科学研究院 Heating-network dewatering and heating system of heat supply unit

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Address after: Hangzhou City, Zhejiang Province, 310030 Xihu District science and Technology Park of West Lake Park Road, No. 10

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