CN105570861B - A kind of cascaded utilization of energy apparatus and method for extraction for heat supply system - Google Patents
A kind of cascaded utilization of energy apparatus and method for extraction for heat supply system Download PDFInfo
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- CN105570861B CN105570861B CN201610100676.7A CN201610100676A CN105570861B CN 105570861 B CN105570861 B CN 105570861B CN 201610100676 A CN201610100676 A CN 201610100676A CN 105570861 B CN105570861 B CN 105570861B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The present invention relates to a kind of cascaded utilization of energy apparatus and method for extraction for heat supply system.There is presently no such apparatus and method that can improve steam power plant's comprehensive energy utilization ratio.The present invention includes bleeder heater, vapor-water heat exchanger, regenerative steam pipe, boiler feedwater return pipe, boiler feedwater feed pipe, heat supply extraction steam pipe and desuperheat extraction steam pipe, boiler feedwater return pipe bifurcates, a wherein branch road enters vapor-water heat exchanger, steam with being drawn gas from heat supply is exchanged heat, it can be that extraction steam for factories or resident's heating are drawn gas that heat supply, which is drawn gas, and bleeder heater can be certain primary heater in power plant's heat regenerative system；The temperature drawn gas according to boiler feedwater backwater and heat supply matches principle, the series of bleeder heater is determined, fully recycles the degree of superheat that heat supply is drawn gas, really uses the cascade utilization of energy, the energy consumption of steam power plant is further reduced, improves the comprehensive energy utilization ratio of steam power plant.
Description
Technical field
The present invention relates to a kind of cascaded utilization of energy apparatus and method for extraction for heat supply system, heat supply is primarily adapted for use in
Extraction steam pipe is present in the steam power plant of the degree of superheat, belongs to cogeneration of heat and power field.
Background technology
In recent years, national " 12 " planning clearly propose nationwide units GDP energy consumption in 2015 than
Reduce by 16% within 2010, unit GDP CO2Discharge reduces by 17% grade energy-saving and emission-reduction index.Thermal power plant is main
With energy rich and influential family, this requires each electricity power enterprise to take advanced technical measures, to improve the efficiency of energy utilization of power plant.
At present, China's central heating is since the 1990s, and has obtained quick development.For real in early days
The industrial heating power plant or resident's heating power plant of existing central heating, because heat supply process is extensive, simple, cause energy loss
Seriously so that the main reason for comprehensive energy utilization ratio of steam power plant can not further improve, cause this phenomenon is many
Certain degree of superheat all be present in the heat supply extraction steam pipe of steam power plant, when draw gas be directly used in external heat supply when, there will be very big energy
Measure conversion loss.Such as industrial heating extraction steam pipe, to reduce the temperature of steam, spray desuperheating directly is carried out to steam, deposited among these
In very big entropy loss；And resident's heating is drawn gas, the steam of overheat is directly sent into heat exchangers for district heating heating heat supply network backwater, due to
Two kinds can flow excessive temperature differentials, cause the energy conversion efficiency of heat exchangers for district heating too low.Therefore, how the portion is further fully reclaimed
The degree of superheat divided, energy conversion rate is improved, so as to improve the comprehensive energy utilization ratio of steam power plant, will be become most important.
Also there is the device that some can improve power plant's comprehensive energy utilization ratio now, if publication date is November 24 in 2010
Day, in Publication No. CN201652566U Chinese patent, disclose a kind of asymmetric series connection heating plant, the asymmetric
Connect in heating plant, respectively one heat exchangers for district heating of connection, two heat supply networks add the heat supply extraction steam pipe control valve of two thermal power plant units
Hot device is asymmetric series connection, and the heat supply that thermal power plant unit is reduced using asymmetric series connection heating plant is drawn gas pipe pressure, is realized
To the stepped heating of recirculated water, the cascade utilization of energy, with routine be arranged in parallel mode compared with, in heating load identical situation
Under, it is possible to increase circulating water outlet temperature, increase the economic benefit of steam power plant, but asymmetric series connection heating plant due to
Limited by structure, use underaction.
In summary, there is presently no a kind of reasonable in design, dependable performance, be advantageous to improve steam power plant's comprehensive energy
The cascaded utilization of energy apparatus and method for extraction for heat supply system of utilization ratio.
The content of the invention
It is an object of the invention to overcome above shortcomings in the prior art, according to " temperature counterpart, cascade utilization "
With can principle, and provide a kind of reasonable in design, dependable performance, be advantageous to improve steam power plant's comprehensive energy utilization ratio
Cascaded utilization of energy apparatus and method for extraction for heat supply system.
Technical scheme is used by the present invention solves the above problems：This is used for the cascaded utilization of energy of extraction for heat supply system
The design feature of device is：Including bleeder heater, regenerative steam pipe, valve A, valve B, boiler feedwater return pipe, boiler
Feed water feed pipe, valve C, valve D, valve E, heat supply extraction steam pipe, desuperheat extraction steam pipe, vapor-water heat exchanger, valve F, valve G, valve
Door H, boiler feedwater water supply branch pipe one, bypass, boiler feedwater return branch, boiler feedwater water supply branch pipe two and heat supply structure, institute
State regenerative steam pipe to connect with bleeder heater, the boiler feedwater return pipe and boiler feedwater feed pipe are and bleeder heater
Connection, one end of the boiler feedwater return branch is connected on boiler feedwater return pipe, the boiler feedwater return branch it is another
One end is connected on vapor-water heat exchanger, and one end of the boiler feedwater water supply branch pipe two is connected on vapor-water heat exchanger, the boiler
The other end of feedwater water supply branch pipe two is connected on boiler feedwater feed pipe, one end connection of the boiler feedwater water supply branch pipe one
On boiler feedwater return pipe, the other end of the boiler feedwater water supply branch pipe one is connected on boiler feedwater water supply branch pipe two, institute
Valve B is stated on boiler feedwater return pipe, one end of the boiler feedwater return branch, valve B, boiler feedwater water supply branch
One end of pipe one and bleeder heater are arranged in order along boiler feedwater return pipe, and the valve A is arranged on boiler feedwater feed pipe
On, valve A is located between the other end and bleeder heater of boiler feedwater water supply branch pipe two, and the valve D is arranged on boiler
In the return branch that feeds water, the valve C is arranged on boiler feedwater water supply branch pipe two, and valve C is located at boiler feedwater water supply branch
Between the other end of pipe one and the other end of boiler feedwater water supply branch pipe two, the valve E is arranged on boiler feedwater water supply branch pipe
On one, the heat supply extraction steam pipe and desuperheat extraction steam pipe are connected with vapor-water heat exchanger, and one end of the bypass is connected to heat supply and taken out
On steam pipe, the other end of the bypass is connected on desuperheat extraction steam pipe, and the valve H is arranged in bypass, and the valve F is arranged on
On heat supply extraction steam pipe, for valve F between one end of bypass and vapor-water heat exchanger, the valve G is arranged on desuperheat extraction steam pipe
On, valve G is between the other end and vapor-water heat exchanger of bypass；The heat supply structure includes steam drainage pipe, heat supply network adds
Hot device, heat supply network return pipe and heat supply network feed pipe, the desuperheat extraction steam pipe, steam drainage pipe, heat supply network return pipe and heat supply network feed pipe
It is connected with heat exchangers for district heating；Or the heat supply structure includes reducing-and-cooling plant and industrial steam supply pipe, the desuperheat draws gas
Pipe and industrial steam supply pipe are connected with reducing-and-cooling plant.
Preferably, bleeder heater of the present invention is No. 1 high-pressure heater in power plant's heat regenerative system, No. 2 high pressures
Heater, No. 3 high-pressure heaters, oxygen-eliminating device, No. 5 high-pressure heaters, No. 6 high-pressure heaters, No. 7 high-pressure heaters and No. 8 height
Press one or more in heater.
Preferably, reducing-and-cooling plant of the present invention, which can also be substituted for waste heat overbottom pressure, utilizes device.
A kind of cascaded utilization of energy method using cascaded utilization of energy device, its feature are：The energy cascade profit
The step of with method, is as follows：When heat supply structure includes steam drainage pipe, heat exchangers for district heating, heat supply network return pipe and heat supply network feed pipe
When, the first principle that matches according to the temperature of boiler feedwater return pipe and heat supply extraction steam pipe, the series of bleeder heater is determined, so
Boiler feedwater respectively enters bleeder heater and vapor-water heat exchanger by boiler feedwater return pipe and boiler feedwater return branch afterwards,
Accumulated after heat exchange all the way, control valve C and valve E, for selecting the string between vapor-water heat exchanger and bleeder heater
Join the aperture of connected mode or parallel, control valve B and valve D, for adjusting boiler feedwater return pipe and boiler
Feedwater return branch respectively enters the boiler feedwater flow of bleeder heater and vapor-water heat exchanger；Heat supply is drawn gas is drawn gas by heat supply
After pipe enters vapor-water heat exchanger, exchanged heat with the boiler feedwater in vapor-water heat exchanger, and heat supply network is entered by desuperheat extraction steam pipe
Heat supply network backwater in heater, with heat exchangers for district heating is exchanged heat, and the steam drainage of formation returns to thermoelectricity by steam drainage pipe
The draining system of factory, heat supply network backwater forms heat supply network after being heated and supplied water, and is supplied to resident's heating by heat supply network feed pipe, adjusts
Valve F and valve H aperture, the heat supply extraction flow of vapor-water heat exchanger, unnecessary heat supply are entered for adjusting heat supply extraction steam pipe
Draw gas and desuperheat extraction steam pipe is collected to by bypass；
Or when heat supply structure includes reducing-and-cooling plant and industrial steam supply pipe, first according to boiler feedwater return pipe and
The principle that the temperature of heat supply extraction steam pipe matches, the series of bleeder heater is determined, then boiler feedwater is returned by boiler feedwater
Water pipe and boiler feedwater return branch respectively enter bleeder heater and vapor-water heat exchanger, and after heat exchange, boiler feedwater passes through
Boiler feedwater feed pipe and boiler feedwater water supply branch pipe two accumulate all the way, control valve C and valve E, for selecting carbonated drink to change
The aperture for being connected in series mode or parallel, control valve B and valve D between hot device and bleeder heater, is used for
Regulation boiler feedwater return pipe and boiler feedwater return branch respectively enter the boiler feedwater of bleeder heater and vapor-water heat exchanger
Flow；Heat supply draw gas by heat supply extraction steam pipe enter vapor-water heat exchanger after, exchanged heat with the boiler feedwater in vapor-water heat exchanger,
And reducing-and-cooling plant is entered by desuperheat extraction steam pipe and carries out further decrease temperature and pressure, then form industrial steam supply and pass through industry
The directly external heat supply of steam supply pipe, control valve F and valve H aperture, for adjusting heat supply extraction steam pipe into vapor-water heat exchanger
Heat supply extraction flow, unnecessary heat supply is drawn gas is collected to desuperheat extraction steam pipe by bypass.
Preferably, the present invention enters the partial heat or net quantity of heat that draw gas higher than saturation temperature for external heat supply
Row recovery, for heating boiler feed water, substitute completely or part substitutes certain level or what bleeder heater.
Preferably, the present invention according to the temperature of boiler feedwater return pipe and heat supply extraction steam pipe match principle when, root
According to temperature cascade utilization principle, heat supply extraction temperature will match with boiler feed temperature, determine the series of bleeder heater, return
Heat is drawn gas as corresponding steam turbine regenerative steam.
Preferably, the desuperheat that the present invention when heat supply is drawn gas and drawn gas for resident's heating, comes out from vapor-water heat exchanger draws gas
Temperature need to be slightly above the vapo(u)rous temperature；When heat supply draw gas for extraction steam for factories when, from vapor-water heat exchanger come out desuperheat draw gas
Temperature need to match with vapor (steam) temperature needed for industrial user, and now steam supply temperature is slightly above temperature needed for industrial user.
The present invention compared with prior art, has advantages below and effect：（1）Reasonable in design, simple in construction, performance can
Lean on, the cascade utilization principle based on energy, rationally design the degree of superheat recovery method that heat supply is drawn gas；（2）Heat supply extraction temperature quilt
Slightly above saturated-steam temperature or slightly above temperature needed for industrial user are down to, so as to avoid heat supply from drawing gas in next stage equipment
Energy loss；（3）The degree of superheat that heat supply is drawn gas is used for heating boiler feed water, substitutes or part substitutes bleeder heater, subtract
Lack the regenerative steam of unit, add unit generation ability.The present invention is used for the extraction for heat supply system of steam power plant, can be very big
Reduction energy conversion loss, increase unit generation ability, improve the comprehensive energy utilization rate of steam power plant.
The boiler feedwater backwater of the present invention respectively enters bleeder heater and vapor-water heat exchanger, after heat exchange, two branch roads
Boiler feedwater is accumulated all the way again, and valve, the boiler feedwater of vapor-water heat exchanger are respectively provided with the forward and backward pipeline of bleeder heater
Valve is respectively provided with the forward and backward pipeline of side, heat supply is drawn gas into vapor-water heat exchanger, after being exchanged heat with boiler feedwater externally
Steam supply, and valve is housed on the forward and backward pipeline for entering vapor-water heat exchanger, the heat supply of vapor-water heat exchanger draws gas side provided with side
Road, it can be that extraction steam for factories or resident's heating are drawn gas that heat supply, which is drawn gas, and bleeder heater can be a certain in power plant's heat regenerative system
Level or what heater, regenerative steam are the corresponding steam turbine regenerative steam of heater.
It can be that extraction steam for factories or resident's heating are drawn gas that the heat supply of the present invention, which is drawn gas, draw gas when heat supply and drawn gas for resident's heating
When, desuperheat draws gas to be connected with heat exchangers for district heating, and steam enters heat exchangers for district heating, by heating the external heat supply of heat supply network backwater；Work as confession
Heat draw gas for industrial steam supply when, desuperheat, which is drawn gas, to be connected with reducing-and-cooling plant or small turbine, and steam is further cooled
After decompression, external direct steam supply.Serial or parallel connection mode can be used between vapor-water heat exchanger and bleeder heater.Backheat heats
Be respectively provided with valve on the forward and backward pipeline of device, the bleed steam pipework that is connected with vapor-water heat exchanger and boiler feedwater pipeline it is forward and backward
Also valve is all respectively provided with, for adjustment control or isolation.The draw gas pipeline that is connected with vapor-water heat exchanger of heat supply is provided with bypass,
Valve is housed in bypass, the heat supply amount of drawing gas of vapor-water heat exchanger is entered for adjustment control.
Brief description of the drawings
Fig. 1 is the structural representation for the cascaded utilization of energy device for being used for extraction for heat supply system in the embodiment of the present invention.
Fig. 2 is that the cascaded utilization of energy device in the embodiment of the present invention for extraction for heat supply system is carrying out energy cascade profit
The structural representation of used time.
Fig. 3 is that the cascaded utilization of energy device in the embodiment of the present invention for extraction for heat supply system is carrying out energy cascade profit
Another structural representation of used time.
In figure：1-bleeder heater, 2-regenerative steam pipe, 3-valve A, 4-valve B, 5-boiler feedwater return pipe,
6-boiler feedwater feed pipe, 7-valve C, 8-valve D, 9-valve E, 10-heat supply extraction steam pipe, 11-desuperheat extraction steam pipe,
12-vapor-water heat exchanger, 13-valve F, 14-valve G, 15-valve H, 16-steam drainage pipe, 17-heat exchangers for district heating,
18-heat supply network return pipe, 19-heat supply network feed pipe, 20-reducing-and-cooling plant, 21-industrial steam supply pipe, 22-boiler feedwater supply
Water branch pipe one, 23-bypass, 24-boiler feedwater return branch, 25-boiler feedwater water supply branch pipe two.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described in further detail by embodiment, and following examples are to this hair
Bright explanation and the invention is not limited in following examples.
Embodiment.
Referring to Fig. 1 to Fig. 3, the cascaded utilization of energy device that extraction for heat supply system is used in the present embodiment heats including backheat
Device 1, regenerative steam pipe 2, valve A3, valve B4, boiler feedwater return pipe 5, boiler feedwater feed pipe 6, valve C7, valve D8,
Valve E9, heat supply extraction steam pipe 10, desuperheat extraction steam pipe 11, vapor-water heat exchanger 12, valve F13, valve G14, valve H15, boiler are given
Water water supply branch pipe 1, bypass 23, boiler feedwater return branch 24, boiler feedwater water supply branch pipe 2 25 and heat supply structure.
Regenerative steam pipe 2 and bleeder heater 1 in the present embodiment connect, and boiler feedwater return pipe 5 and boiler feedwater supply
Water pipe 6 is connected with bleeder heater 1, and one end of boiler feedwater return branch 24 is connected on boiler feedwater return pipe 5, the pot
The other end of stove feedwater return branch 24 is connected on vapor-water heat exchanger 12, and one end of boiler feedwater water supply branch pipe 2 25 is connected to
On vapor-water heat exchanger 12, the other end of the boiler feedwater water supply branch pipe 2 25 is connected on boiler feedwater feed pipe 6, boiler feedwater
One end of water supply branch pipe 1 is connected on boiler feedwater return pipe 5, the other end connection of the boiler feedwater water supply branch pipe 1
On boiler feedwater water supply branch pipe 2 25.
Valve B4 in the present embodiment is arranged on boiler feedwater return pipe 5, one end of boiler feedwater return branch 24, valve
Door B4, one end of boiler feedwater water supply branch pipe 1 and bleeder heater 1 are arranged in order along boiler feedwater return pipe 5, valve A3
On boiler feedwater feed pipe 6, valve A3 is located at the other end and bleeder heater 1 of boiler feedwater water supply branch pipe 2 25
Between, valve D8 is arranged in boiler feedwater return branch 24, and valve C7 is arranged on boiler feedwater water supply branch pipe 2 25, the valve
Door C7 is located between the other end of boiler feedwater water supply branch pipe 1 and the other end of boiler feedwater water supply branch pipe 2 25, valve E9
On boiler feedwater water supply branch pipe 1.
Heat supply extraction steam pipe 10 and desuperheat extraction steam pipe 11 in the present embodiment are connected with vapor-water heat exchanger 12, bypass 23 one
End is connected on heat supply extraction steam pipe 10, and the other end of the bypass 23 is connected on desuperheat extraction steam pipe 11, and valve H15 is arranged on bypass
On 23, valve F13 is arranged on heat supply extraction steam pipe 10, and valve F13 is located between one end and the vapor-water heat exchanger 12 of bypass 23,
Valve G14 is arranged on desuperheat extraction steam pipe 11, and valve G14 is between the other end and vapor-water heat exchanger 12 of bypass 23.
Heat supply structure in the present embodiment includes steam drainage pipe 16, heat exchangers for district heating 17, heat supply network return pipe 18 and heat supply network
Feed pipe 19, desuperheat extraction steam pipe 11, steam drainage pipe 16, heat supply network return pipe 18 and heat supply network feed pipe 19 with heat exchangers for district heating 17
Connection；Or heat supply structure includes reducing-and-cooling plant 20 and industrial steam supply pipe 21, desuperheat extraction steam pipe 11 and industrial steam supply pipe 21
It is connected with reducing-and-cooling plant 20.
Bleeder heater 1 in the present embodiment can add for No. 1 high-pressure heater in power plant's heat regenerative system, No. 2 high pressures
In hot device, No. 3 high-pressure heaters, No. 5 high-pressure heaters, No. 6 high-pressure heaters, No. 7 high-pressure heaters and No. 8 high-pressure heaters
One or more.Reducing-and-cooling plant 20 can also be substituted for waste heat overbottom pressure and utilize device.
The step of cascaded utilization of energy method of cascaded utilization of energy device is used in the present embodiment is as follows：When heat supply structure
During including steam drainage pipe 16, heat exchangers for district heating 17, heat supply network return pipe 18 and heat supply network feed pipe 19, first according to boiler feedwater backwater
The principle that the temperature of pipe 5 and heat supply extraction steam pipe 10 matches, determines the series of bleeder heater 1, and then boiler feedwater passes through pot
Stove feedwater return pipe 5 and boiler feedwater return branch 24 respectively enter bleeder heater 1 and vapor-water heat exchanger 12, by heat exchange
Afterwards, boiler feedwater is accumulated all the way by boiler feedwater feed pipe 6 and boiler feedwater water supply branch pipe 2 25, the Hes of control valve C 7
Valve E 9, for selecting to be connected in series mode or parallel between vapor-water heat exchanger 12 and bleeder heater 1, adjust
Valve B 4 and valve D 8 aperture are saved, is respectively enterd for adjusting boiler feedwater return pipe 5 and boiler feedwater return branch 24
The boiler feedwater flow of bleeder heater 1 and vapor-water heat exchanger 12；Heat supply is drawn gas enters steam-water heat exchanging by heat supply extraction steam pipe 10
After device 12, exchanged heat with the boiler feedwater in vapor-water heat exchanger 12, and heat exchangers for district heating 17 entered by desuperheat extraction steam pipe 11,
Exchanged heat with the heat supply network backwater in heat exchangers for district heating 17, the steam drainage of formation returns to steam power plant by steam drainage pipe 16
Draining system, heat supply network backwater forms heat supply network after being heated and supplied water, and is supplied to resident's heating, regulating valve by heat supply network feed pipe 19
Door F 13 and valve H 15 aperture, the heat supply extraction flow of vapor-water heat exchanger 12 is entered for adjusting heat supply extraction steam pipe 10, it is more
Remaining heat supply is drawn gas is collected to desuperheat extraction steam pipe 11 by bypass 23.
Or when heat supply structure includes reducing-and-cooling plant 20 and industrial steam supply pipe 21, first according to boiler feedwater backwater
The principle that the temperature of pipe 5 and heat supply extraction steam pipe 10 matches, determines the series of bleeder heater 1, and then boiler feedwater passes through pot
Stove feedwater return pipe 5 and boiler feedwater return branch 24 respectively enter bleeder heater 1 and vapor-water heat exchanger 12, by heat exchange
Afterwards, boiler feedwater is accumulated all the way by boiler feedwater feed pipe 6 and boiler feedwater water supply branch pipe 2 25, the Hes of control valve C 7
Valve E 9, for selecting to be connected in series mode or parallel between vapor-water heat exchanger 12 and bleeder heater 1, adjust
Valve B 4 and valve D 8 aperture are saved, is respectively enterd for adjusting boiler feedwater return pipe 5 and boiler feedwater return branch 24
The boiler feedwater flow of bleeder heater 1 and vapor-water heat exchanger 12；Heat supply is drawn gas enters steam-water heat exchanging by heat supply extraction steam pipe 10
After device 12, exchanged heat with the boiler feedwater in vapor-water heat exchanger 12, and reducing-and-cooling plant is entered by desuperheat extraction steam pipe 11
20 carry out further decrease temperature and pressure, then form industrial steam supply and by the directly external heat supply of industrial steam supply pipe 21, control valve F
13 and valve H 15 aperture, the heat supply extraction flow of vapor-water heat exchanger 12 is entered for adjusting heat supply extraction steam pipe 10, it is unnecessary
Heat supply is drawn gas is collected to desuperheat extraction steam pipe 11 by bypass 23.
The present embodiment is reclaimed the partial heat or net quantity of heat that draw gas higher than saturation temperature for external heat supply,
For heating boiler feed water, substitute completely or part substitutes certain level or what bleeder heater.According to boiler feedwater return pipe 5
With the temperature of heat supply extraction steam pipe 10 match principle when, according to temperature cascade utilization principle, heat supply extraction temperature will give with boiler
Coolant-temperature gage matches, and determines the series of bleeder heater 1, and regenerative steam is corresponding steam turbine regenerative steam.When heat supply is taken out
When vapour is that resident's heating is drawn gas, the desuperheat extraction temperature come out from vapor-water heat exchanger 12 need to be slightly above the vapo(u)rous temperature；When
Heat supply draw gas for extraction steam for factories when, from vapor-water heat exchanger 12 come out desuperheat extraction temperature need to be with vapor (steam) temperature needed for industrial user
Match, now steam supply temperature is slightly above temperature needed for industrial user.
It can be that extraction steam for factories or resident's heating are drawn gas that heat supply in the present embodiment, which is drawn gas, and bleeder heater 1 can be electricity
Certain primary heater in factory's heat regenerative system；The temperature drawn gas according to boiler feedwater backwater and heat supply matches principle, it is determined that returning
The series of hot heater 1, the degree of superheat that heat supply is drawn gas fully is recycled, really use the cascade utilization of energy, further drop
The energy consumption of low-heat power plant, improve the comprehensive energy utilization ratio of steam power plant.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named
Title etc. can be different, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to
The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair
In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment
The modification of various kinds or supplement are substituted using similar mode, without departing from structure of the invention or surmount present claims
Scope defined in book, protection scope of the present invention all should be belonged to.
Claims (7)
- A kind of 1. cascaded utilization of energy device for extraction for heat supply system, it is characterised in that：Taken out including bleeder heater, backheat Steam pipe, valve A, valve B, boiler feedwater return pipe, boiler feedwater feed pipe, valve C, valve D, valve E, heat supply extraction steam pipe, Desuperheat extraction steam pipe, vapor-water heat exchanger, valve F, valve G, valve H, boiler feedwater water supply branch pipe one, bypass, boiler feedwater backwater Branch pipe, boiler feedwater water supply branch pipe two and heat supply structure, the regenerative steam pipe connect with bleeder heater, the boiler feedwater Return pipe and boiler feedwater feed pipe are connected with bleeder heater, and one end of the boiler feedwater return branch is connected to boiler Feed water on return pipe, the other end of the boiler feedwater return branch is connected on vapor-water heat exchanger, the boiler feedwater water supply branch One end of pipe two is connected on vapor-water heat exchanger, and the other end of the boiler feedwater water supply branch pipe two is connected to boiler feedwater feed pipe On, one end of the boiler feedwater water supply branch pipe one is connected on boiler feedwater return pipe, the boiler feedwater water supply branch pipe one The other end is connected on boiler feedwater water supply branch pipe two, and the valve B is arranged on boiler feedwater return pipe, the boiler feedwater One end, valve B, one end of boiler feedwater water supply branch pipe one and the bleeder heater of return branch along boiler feedwater return pipe successively Arrangement, the valve A are arranged on boiler feedwater feed pipe, valve A be located at the other end of boiler feedwater water supply branch pipe two with Between bleeder heater, the valve D is arranged in boiler feedwater return branch, and the valve C supplies water installed in boiler feedwater On branch pipe two, valve C be located at boiler feedwater water supply branch pipe one the other end and boiler feedwater water supply branch pipe two the other end it Between, the valve E is arranged on boiler feedwater water supply branch pipe one, and the heat supply extraction steam pipe and desuperheat extraction steam pipe are and steam-water heat exchanging Device is connected, and one end of the bypass is connected on heat supply extraction steam pipe, and the other end of the bypass is connected on desuperheat extraction steam pipe, described Valve H is arranged in bypass, and the valve F is arranged on heat supply extraction steam pipe, and valve F is positioned at one end of bypass and steam-water heat exchanging Between device, the valve G is arranged on desuperheat extraction steam pipe, and valve G is between the other end and vapor-water heat exchanger of bypass；Institute Stating heat supply structure includes steam drainage pipe, heat exchangers for district heating, heat supply network return pipe and heat supply network feed pipe, the desuperheat extraction steam pipe, steams Vapour drain pipe, heat supply network return pipe and heat supply network feed pipe are connected with heat exchangers for district heating；Or the heat supply structure subtracts including desuperheat Pressure device and industrial steam supply pipe, the desuperheat extraction steam pipe and industrial steam supply pipe are connected with reducing-and-cooling plant.
- 2. the cascaded utilization of energy device according to claim 1 for extraction for heat supply system, it is characterised in that：Described time Hot heater is No. 1 high-pressure heater in power plant's heat regenerative system, No. 2 high-pressure heaters, No. 3 high-pressure heaters, oxygen-eliminating device, 5 One or more in number high-pressure heater, No. 6 high-pressure heaters, No. 7 high-pressure heaters and No. 8 high-pressure heaters.
- 3. the cascaded utilization of energy device according to claim 1 for extraction for heat supply system, it is characterised in that：By described in Reducing-and-cooling plant is substituted for waste heat overbottom pressure and utilizes device.
- 4. a kind of cascaded utilization of energy method of cascaded utilization of energy device using as described in claim 1 or 2 or 3, it is special Sign is：The step of cascaded utilization of energy method, is as follows：When heat supply structure includes steam drainage pipe, heat exchangers for district heating, heat When net return pipe and heat supply network feed pipe, the first principle to be matched according to the temperature of boiler feedwater return pipe and heat supply extraction steam pipe, really Determine the series of bleeder heater, then boiler feedwater is respectively enterd back by boiler feedwater return pipe and boiler feedwater return branch Hot heater and vapor-water heat exchanger, accumulated after heat exchange all the way, control valve C and valve E, for selecting vapor-water heat exchanger The aperture for being connected in series mode or parallel, control valve B and valve D between bleeder heater, for adjusting Boiler feedwater return pipe and boiler feedwater return branch respectively enter the boiler feedwater flow of bleeder heater and vapor-water heat exchanger； Heat supply draw gas by heat supply extraction steam pipe enter vapor-water heat exchanger after, exchanged heat with the boiler feedwater in vapor-water heat exchanger, and lead to Cross desuperheat extraction steam pipe to be exchanged heat into the heat supply network backwater in heat exchangers for district heating, with heat exchangers for district heating, the steam drainage of formation leads to The draining system that steam drainage pipe returns to steam power plant is crossed, heat supply network backwater forms heat supply network after being heated and supplied water, and is supplied water by heat supply network Pipe is supplied to the aperture of resident's heating, control valve F and valve H, and the confession of vapor-water heat exchanger is entered for adjusting heat supply extraction steam pipe Hot extraction flow, unnecessary heat supply is drawn gas is collected to desuperheat extraction steam pipe by bypass；Or when heat supply structure includes reducing-and-cooling plant and industrial steam supply pipe, first according to boiler feedwater return pipe and heat supply The principle that the temperature of extraction steam pipe matches, the series of bleeder heater is determined, then boiler feedwater passes through boiler feedwater return pipe Bleeder heater and vapor-water heat exchanger are respectively enterd with boiler feedwater return branch, is accumulated after heat exchange all the way, regulating valve Door C and valve E, for selecting to be connected in series mode or parallel between vapor-water heat exchanger and bleeder heater, adjust Valve B and valve D aperture is saved, backheat heating is respectively enterd for adjusting boiler feedwater return pipe and boiler feedwater return branch The boiler feedwater flow of device and vapor-water heat exchanger；Heat supply draw gas by heat supply extraction steam pipe enter vapor-water heat exchanger after, changed with carbonated drink Boiler feedwater in hot device is exchanged heat, and is entered reducing-and-cooling plant by desuperheat extraction steam pipe and carried out further decrease temperature and pressure, Then industrial steam supply is formed and by the directly external heat supply of industrial steam supply pipe, control valve F and valve H aperture, for adjusting Heat supply extraction steam pipe enters the heat supply extraction flow of vapor-water heat exchanger, and unnecessary heat supply is drawn gas is collected to desuperheat extraction steam pipe by bypass.
- 5. cascaded utilization of energy method according to claim 4, it is characterised in that：It will be higher than for drawing gas for external heat supply The partial heat or net quantity of heat of saturation temperature are reclaimed, and for heating boiler feed water, substitute completely or part substitutes certain level Or what bleeder heater.
- 6. cascaded utilization of energy method according to claim 4, it is characterised in that：According to boiler feedwater return pipe and confession The temperature of hot extraction steam pipe match principle when, according to temperature cascade utilization principle, heat supply extraction temperature will and boiler feed temperature Match, determine the series of bleeder heater, regenerative steam is corresponding steam turbine regenerative steam.
- 7. cascaded utilization of energy method according to claim 4, it is characterised in that：Draw gas when heat supply and drawn gas for resident's heating When, the desuperheat extraction temperature come out from vapor-water heat exchanger need to be slightly above the vapo(u)rous temperature；When heat supply is drawn gas as extraction steam for factories When, the desuperheat extraction temperature come out from vapor-water heat exchanger need to match with vapor (steam) temperature needed for industrial user, now steam supply temperature Slightly above temperature needed for industrial user.
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| CN106194295A (en) * | 2016-08-31 | 2016-12-07 | 上海量朝能源科技有限公司 | The coalignment of a kind of fired power generating unit heating parameter and method |
| CN109653819B (en) * | 2019-01-24 | 2023-10-24 | 中国电力工程顾问集团东北电力设计院有限公司 | Deep peak-shaving steam turbine system of cogeneration unit and control method |
| CN112554978B (en) * | 2020-11-16 | 2023-01-17 | 中国能源建设集团山西省电力勘测设计院有限公司 | Coupling complementary method for supercritical CO2 power generation and long-distance steam transmission |
| CN113464226B (en) * | 2021-08-10 | 2023-05-26 | 山东英电环保科技有限公司 | System and method for quick response of unit frequency modulation |
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Address after: Hangzhou City, Zhejiang Province, 310030 Xihu District science and Technology Park of West Lake Park Road, No. 10 Patentee after: Huadian Power Science Research Institute Co., Ltd. Address before: Hangzhou City, Zhejiang Province, 310030 Xihu District science and Technology Park of West Lake Park Road, No. 10 Patentee before: China Huadian Electric Research Institute |
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