CN105570861A - Energy cascade utilization device and method for extraction steam heating system - Google Patents
Energy cascade utilization device and method for extraction steam heating system Download PDFInfo
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- CN105570861A CN105570861A CN201610100676.7A CN201610100676A CN105570861A CN 105570861 A CN105570861 A CN 105570861A CN 201610100676 A CN201610100676 A CN 201610100676A CN 105570861 A CN105570861 A CN 105570861A
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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 invention relates to an energy cascade utilization device and method for an extraction steam heating system. The device and method which are capable of increasing the comprehensive energy utilization efficiency of a heat power plant are not provided at present. The device provided by the invention comprises a regenerative heater, a steam-water heat exchanger, a regenerative extraction steam pipe, a boiler feed water return pipe, a boiler feed water supply pipe, a heat supply extraction steam pipe and a temperature reduction extraction steam pipe, wherein the boiler feed water return pipe is divided into two branches, wherein one branch enters the steam-water heat exchanger and carries out heat exchange with the steam from heat supply extraction steam; the heat supply extraction steam can be industrial extraction steam or domestic heating extraction steam; and the regenerative heater can be one stage of heater in a heat regenerative system of the power plant. According to the principle of matching between the temperature of return water of the boiler feed water and the temperature of the heat supply extraction steam, the progression of the regenerative heater is determined, the superheating degree of the heat supply extraction steam is fully recycled, and the cascade utilization of the energy is really realized, thereby further reducing the energy consumption of the heat power plant and increasing the comprehensive energy utilization efficiency of the heat 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, be mainly applicable to heat supply extraction steam pipe and exist in the steam power plant of the degree of superheat, belong to cogeneration of heat and power field.
Background technology
In recent years, country " 12 " planning clearly proposes nationwide units GDP energy consumption in 2015 than reduction by 16%, unit GDP CO in 2010
2index such as energy-saving and emission-reduction such as discharge reduction by 17% grade.Thermal power plant is main use energy rich and influential family, and this just requires that each electricity power enterprise takes advanced technical measures, to improve the efficiency of energy utilization of power plant.
At present, China's central heating from the nineties in 20th century, and obtains and develops fast.For the industrial heating power plant or the resident's heating power plant that have realized central heating in early days, because heat supply process is extensive, simple, cause energy loss serious, the comprehensive energy utilization ratio of steam power plant cannot be improved further, the main cause of this phenomenon is caused to be that the heat supply extraction steam pipe of many steam power plants all exists certain degree of superheat, when being directly used in external heat supply when drawing gas, very large energy conversion loss will be there is.As industrial heating extraction steam pipe, for reducing the temperature of steam, directly carrying out spray desuperheating to steam, wherein there is very large entropy loss in this; And resident's heating is drawn gas, directly overheated steam is sent into heat exchangers for district heating heating heat supply network backwater, because two kinds can be flowed excessive temperature differentials, cause the energy conversion efficiency of heat exchangers for district heating too low.Therefore, how fully to reclaim the degree of superheat of this part further, improve energy conversion rate, thus improve the comprehensive energy utilization ratio of steam power plant, will become most important.
Also there are some can improve the device of power plant's comprehensive energy utilization ratio now, if publication date is on November 24th, 2010, publication number is in the Chinese patent of CN201652566U, disclose a kind of asymmetric series connection heating plant, in this asymmetric series connection heating plant, the heat supply extraction steam pipe control valve of two thermal power plant unit respectively connects a heat exchangers for district heating, two heat exchangers for district heatings are asymmetric series connection, asymmetric series connection heating plant is adopted to reduce the heat supply extraction steam pipe pressure of thermal power plant unit, realize the stepped heating to recirculated water, the cascade utilization of energy, compared with the mode that is arranged in parallel of routine, when heating load is identical, circulating water outlet temperature can be improved, increase the economic benefit of steam power plant, but this asymmetric series connection heating plant is owing to being subject to the restriction of structure, use underaction.
In sum, also there is no a kind of reasonable in design at present, dependable performance, be conducive to the cascaded utilization of energy apparatus and method for extraction for heat supply system improving steam power plant's comprehensive energy utilization ratio.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, according to the use energy principle of " temperature counterpart; cascade utilization ", and a kind of reasonable in design is provided, dependable performance, is conducive to the cascaded utilization of energy apparatus and method for extraction for heat supply system improving steam power plant's comprehensive energy utilization ratio.
The present invention's adopted technical scheme that solves the problem is: this design feature being used for the cascaded utilization of energy device of extraction for heat supply system is: comprise bleeder heater, regenerative 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 arm one, bypass, boiler feedwater return branch, boiler feedwater water supply arm two and confession heat structure, described regenerative steam pipe is connected with bleeder heater, described boiler feedwater return pipe is all connected with bleeder heater with boiler feedwater feed pipe, one end of described boiler feedwater return branch is connected on boiler feedwater return pipe, the other end of this boiler feedwater return branch is connected on vapor-water heat exchanger, one end of described boiler feedwater water supply arm two is connected on vapor-water heat exchanger, the other end of this boiler feedwater water supply arm two is connected on boiler feedwater feed pipe, one end of described boiler feedwater water supply arm one is connected on boiler feedwater return pipe, the other end of this boiler feedwater water supply arm one is connected on boiler feedwater water supply arm two, described valve B is arranged on boiler feedwater return pipe, one end of described boiler feedwater return branch, valve B, one end and the bleeder heater of boiler feedwater water supply arm one are arranged in order along boiler feedwater return pipe, described valve A is arranged on boiler feedwater feed pipe, this valve A is between the other end and bleeder heater of boiler feedwater water supply arm two, described valve D is arranged in boiler feedwater return branch, described valve C is arranged on boiler feedwater water supply arm two, this valve C is between the other end and the other end of boiler feedwater water supply arm two of boiler feedwater water supply arm one, described valve E is arranged on boiler feedwater water supply arm one, described heat supply extraction steam pipe is all connected with vapor-water heat exchanger with desuperheat extraction steam pipe, one end of described bypass is connected on heat supply extraction steam pipe, the other end of this bypass is connected on desuperheat extraction steam pipe, described valve H is arranged in bypass, described valve F is arranged on heat supply extraction steam pipe, this valve F is between one end and vapor-water heat exchanger of bypass, described valve G is arranged on desuperheat extraction steam pipe, this valve G is between the other end and vapor-water heat exchanger of bypass, the described heat structure that supplies comprises steam drainage pipe, heat exchangers for district heating, heat supply network return pipe and heat supply network feed pipe, and described desuperheat extraction steam pipe, steam drainage pipe, heat supply network return pipe are all connected with heat exchangers for district heating with heat supply network feed pipe, or the described heat structure that supplies comprises reducing-and-cooling plant and industrial steam supply pipe, and described desuperheat extraction steam pipe is all connected with reducing-and-cooling plant with industrial steam supply pipe.
As preferably, bleeder heater of the present invention is one or more in 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, No. 5 high-pressure heaters, No. 6 high-pressure heaters, No. 7 high-pressure heaters and No. 8 high-pressure heaters.
As preferably, reducing-and-cooling plant of the present invention also can replace to waste heat overbottom pressure and utilize device.
A kind of cascaded utilization of energy method using cascaded utilization of energy device, its feature is: the step of described cascaded utilization of energy method is as follows: when comprising steam drainage pipe for heat structure, heat exchangers for district heating, when heat supply network return pipe and heat supply network feed pipe, first according to the principle that the temperature of boiler feedwater return pipe and heat supply extraction steam pipe matches, determine the progression of bleeder heater, then boiler feedwater enters bleeder heater and vapor-water heat exchanger respectively by boiler feedwater return pipe and boiler feedwater return branch, a road is accumulated after heat exchange, control valve C and valve E, for selecting the mode that is connected in series between vapor-water heat exchanger and bleeder heater or parallel, the aperture of control valve B and valve D, for the boiler feedwater flow regulating boiler feedwater return pipe and boiler feedwater return branch to enter bleeder heater and vapor-water heat exchanger respectively, after heat supply is drawn gas and is entered vapor-water heat exchanger by heat supply extraction steam pipe, heat exchange is carried out with the boiler feedwater in vapor-water heat exchanger, and enter heat exchangers for district heating by desuperheat extraction steam pipe, heat exchange is carried out with the heat supply network backwater in heat exchangers for district heating, the steam drainage formed returns the draining system of steam power plant by steam drainage pipe, heat supply network backwater is heated rear formation heat supply network and is supplied water, and be supplied to resident's heating by heat supply network feed pipe, the aperture of control valve F and valve H, for the heat supply extraction flow regulating heat supply extraction steam pipe to enter vapor-water heat exchanger, unnecessary heat supply is drawn gas and is collected to desuperheat extraction steam pipe by bypass,
Or, when comprising reducing-and-cooling plant and industrial steam supply pipe for heat structure, first according to the principle that the temperature of boiler feedwater return pipe and heat supply extraction steam pipe matches, determine the progression of bleeder heater, then boiler feedwater enters bleeder heater and vapor-water heat exchanger respectively by boiler feedwater return pipe and boiler feedwater return branch, after heat exchange, boiler feedwater accumulates a road by boiler feedwater feed pipe and boiler feedwater water supply arm two, control valve C and valve E, for selecting the mode that is connected in series between vapor-water heat exchanger and bleeder heater or parallel, the aperture of control valve B and valve D, for the boiler feedwater flow regulating boiler feedwater return pipe and boiler feedwater return branch to enter bleeder heater and vapor-water heat exchanger respectively, after heat supply is drawn gas and is entered vapor-water heat exchanger by heat supply extraction steam pipe, heat exchange is carried out with the boiler feedwater in vapor-water heat exchanger, and enter reducing-and-cooling plant by desuperheat extraction steam pipe and carry out further decrease temperature and pressure, then industrial steam supply is formed and by the directly externally heat supply of industrial steam supply pipe, the aperture of control valve F and valve H, for the heat supply extraction flow regulating heat supply extraction steam pipe to enter vapor-water heat exchanger, unnecessary heat supply is drawn gas and is collected to desuperheat extraction steam pipe by bypass.
As preferably, the present invention to reclaim being used for drawing gas of external heat supply higher than the partial heat of saturation temperature or net quantity of heat, for heating boiler feed water, substitutes completely or Some substitute level or what bleeder heater.
As preferably, the present invention is when matching principle according to the temperature of boiler feedwater return pipe and heat supply extraction steam pipe, according to temperature cascade utilization principle, heat supply extraction temperature will match with boiler feed temperature, determine the progression of bleeder heater, regenerative steam is corresponding steam turbine regenerative steam.
As preferably, the present invention when heat supply draw gas draw gas for resident's heating time, need a little more than this vapo(u)rous temperature from vapor-water heat exchanger desuperheat extraction temperature out; When heat supply is drawn gas as extraction steam for factories, need match with vapor (steam) temperature needed for industrial user from vapor-water heat exchanger desuperheat extraction temperature out, now supply stripping temperature temperature required a little more than industrial user.
The present invention compared with prior art, has the following advantages and effect: (1) is reasonable in design, and structure is simple, dependable performance, based on the cascade utilization principle of energy, and the degree of superheat recovery method that appropriate design heat supply is drawn gas; (2) heat supply extraction temperature is reduced to a little more than saturated-steam temperature or temperature required a little more than industrial user, thus avoids the energy loss that heat supply is drawn gas in next stage equipment; (3) degree of superheat that heat supply is drawn gas is used to heating boiler feed water, substitutes or Some substitute bleeder heater, decreases 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 reduce energy conversion loss greatly, increases unit generation ability, improves the comprehensive energy utilization rate of steam power plant.
Boiler feedwater backwater of the present invention enters bleeder heater and vapor-water heat exchanger respectively, after heat exchange, two branch road boiler feedwaters accumulate again a road, before bleeder heater, rear pipeline is equipped with valve respectively, before the boiler feedwater side of vapor-water heat exchanger, rear pipeline is equipped with valve respectively, heat supply is drawn gas and is entered vapor-water heat exchanger, external steam supply after carrying out heat exchange with boiler feedwater, and before entering vapor-water heat exchanger, rear pipeline is equipped with valve, the heat supply of vapor-water heat exchanger side of drawing gas is provided with bypass, it can be that extraction steam for factories or resident's heating are drawn gas that heat supply is drawn gas, bleeder heater can be certain one-level in power plant's heat regenerative system or what heater, regenerative steam is the corresponding steam turbine regenerative steam of heater.
It can be that extraction steam for factories or resident's heating are drawn gas that heat supply of the present invention is drawn gas, when heat supply draw gas draw gas for resident's heating time, desuperheat draws gas and to be connected with heat exchangers for district heating, and steam enters heat exchangers for district heating, by the external heat supply of heating heat supply network backwater; When heat supply is drawn gas as industrial steam supply, desuperheat draws gas and can be connected with reducing-and-cooling plant or small turbine, after further for steam decrease temperature and pressure, and externally direct steam supply.Serial or parallel connection mode can be adopted between vapor-water heat exchanger and bleeder heater.The forward and backward pipeline of bleeder heater is equipped with valve respectively, and the bleed steam pipework be connected with vapor-water heat exchanger and the forward and backward of boiler feedwater pipeline are also equipped with valve all respectively, for regulable control or isolation.The heat supply pipeline be connected with vapor-water heat exchanger that draws gas is provided with bypass, valve is equipped with in bypass, enters the heat supply amount of drawing gas of vapor-water heat exchanger for regulable control.
Accompanying drawing explanation
Fig. 1 is the structural representation for the cascaded utilization of energy device of extraction for heat supply system in the embodiment of the present invention.
Fig. 2 is the structural representation of cascaded utilization of energy device when carrying out cascaded utilization of energy for extraction for heat supply system in the embodiment of the present invention.
Fig. 3 is for the cascaded utilization of energy device of extraction for heat supply system another structural representation when carrying out cascaded utilization of energy in the embodiment of the present invention.
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 water supply arm one, 23-bypass, 24-boiler feedwater return branch, 25-boiler feedwater water supply arm two.
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 to Fig. 3, comprise bleeder heater 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 feedwater water supply arm 1, bypass 23, boiler feedwater return branch 24, boiler feedwater water supply arm 2 25 for the cascaded utilization of energy device of extraction for heat supply system in the present embodiment and supply heat structure.
Regenerative steam pipe 2 in the present embodiment is connected with bleeder heater 1, boiler feedwater return pipe 5 is all connected with bleeder heater 1 with boiler feedwater feed pipe 6, one end of boiler feedwater return branch 24 is connected on boiler feedwater return pipe 5, the other end of this boiler feedwater return branch 24 is connected on vapor-water heat exchanger 12, one end of boiler feedwater water supply arm 2 25 is connected on vapor-water heat exchanger 12, the other end of this boiler feedwater water supply arm 2 25 is connected on boiler feedwater feed pipe 6, one end of boiler feedwater water supply arm 1 is connected on boiler feedwater return pipe 5, the other end of this boiler feedwater water supply arm 1 is connected on boiler feedwater water supply arm 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 B4, one end and the bleeder heater 1 of boiler feedwater water supply arm 1 are arranged in order along boiler feedwater return pipe 5, valve A3 is arranged on boiler feedwater feed pipe 6, this valve A3 is between the other end and bleeder heater 1 of boiler feedwater water supply arm 2 25, valve D8 is arranged in boiler feedwater return branch 24, valve C7 is arranged on boiler feedwater water supply arm 2 25, this valve C7 is between the other end and the other end of boiler feedwater water supply arm 2 25 of boiler feedwater water supply arm 1, valve E9 is arranged on boiler feedwater water supply arm 1.
Heat supply extraction steam pipe 10 in the present embodiment is all connected with vapor-water heat exchanger 12 with desuperheat extraction steam pipe 11, one end of bypass 23 is connected on heat supply extraction steam pipe 10, the other end of this bypass 23 is connected on desuperheat extraction steam pipe 11, valve H15 is arranged in bypass 23, valve F13 is arranged on heat supply extraction steam pipe 10, this valve F13 is between one end of bypass 23 and vapor-water heat exchanger 12, and valve G14 is arranged on desuperheat extraction steam pipe 11, and this valve G14 is between the other end and vapor-water heat exchanger 12 of bypass 23.
The heat structure that supplies in the present embodiment comprises steam drainage pipe 16, heat exchangers for district heating 17, heat supply network return pipe 18 and heat supply network feed pipe 19, and desuperheat extraction steam pipe 11, steam drainage pipe 16, heat supply network return pipe 18 are all connected with heat exchangers for district heating 17 with heat supply network feed pipe 19; Or comprise reducing-and-cooling plant 20 and industrial steam supply pipe 21 for heat structure, desuperheat extraction steam pipe 11 is all connected with reducing-and-cooling plant 20 with industrial steam supply pipe 21.
Bleeder heater 1 in the present embodiment can be one or more in No. 1 high-pressure heater in power plant's heat regenerative system, No. 2 high-pressure heaters, 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.Reducing-and-cooling plant 20 also can replace to waste heat overbottom pressure and utilize device.
Use the step of the cascaded utilization of energy method of cascaded utilization of energy device as follows in the present embodiment: when comprising steam drainage pipe 16 for heat structure, heat exchangers for district heating 17, when heat supply network return pipe 18 and heat supply network feed pipe 19, first according to the principle that the temperature of boiler feedwater return pipe 5 and heat supply extraction steam pipe 10 matches, determine the progression of bleeder heater 1, then boiler feedwater enters bleeder heater 1 and vapor-water heat exchanger 12 respectively by boiler feedwater return pipe 5 and boiler feedwater return branch 24, after heat exchange, boiler feedwater accumulates a road by boiler feedwater feed pipe 6 and boiler feedwater water supply arm 2 25, control valve C7 and valve E9, for selecting the mode that is connected in series between vapor-water heat exchanger 12 and bleeder heater 1 or parallel, the aperture of control valve B4 and valve D8, for the boiler feedwater flow regulating boiler feedwater return pipe 5 and boiler feedwater return branch 24 to enter bleeder heater 1 and vapor-water heat exchanger 12 respectively, after heat supply is drawn gas and is entered vapor-water heat exchanger 12 by heat supply extraction steam pipe 10, heat exchange is carried out with the boiler feedwater in vapor-water heat exchanger 12, and enter heat exchangers for district heating 17 by desuperheat extraction steam pipe 11, heat exchange is carried out with the heat supply network backwater in heat exchangers for district heating 17, the steam drainage formed returns the draining system of steam power plant by steam drainage pipe 16, heat supply network backwater is heated rear formation heat supply network and is supplied water, and be supplied to resident's heating by heat supply network feed pipe 19, the aperture of control valve F13 and valve H15, for the heat supply extraction flow regulating heat supply extraction steam pipe 10 to enter vapor-water heat exchanger 12, unnecessary heat supply is drawn gas and is collected to desuperheat extraction steam pipe 11 by bypass 23.
Or, when comprising reducing-and-cooling plant 20 and industrial steam supply pipe 21 for heat structure, first according to the principle that the temperature of boiler feedwater return pipe 5 and heat supply extraction steam pipe 10 matches, determine the progression of bleeder heater 1, then boiler feedwater enters bleeder heater 1 and vapor-water heat exchanger 12 respectively by boiler feedwater return pipe 5 and boiler feedwater return branch 24, after heat exchange, boiler feedwater accumulates a road by boiler feedwater feed pipe 6 and boiler feedwater water supply arm 2 25, control valve C7 and valve E9, for selecting the mode that is connected in series between vapor-water heat exchanger 12 and bleeder heater 1 or parallel, the aperture of control valve B4 and valve D8, for the boiler feedwater flow regulating boiler feedwater return pipe 5 and boiler feedwater return branch 24 to enter bleeder heater 1 and vapor-water heat exchanger 12 respectively, after heat supply is drawn gas and is entered vapor-water heat exchanger 12 by heat supply extraction steam pipe 10, heat exchange is carried out with the boiler feedwater in vapor-water heat exchanger 12, and enter reducing-and-cooling plant 20 by desuperheat extraction steam pipe 11 and carry out further decrease temperature and pressure, then industrial steam supply is formed and by the directly externally heat supply of industrial steam supply pipe 21, the aperture of control valve F13 and valve H15, for the heat supply extraction flow regulating heat supply extraction steam pipe 10 to enter vapor-water heat exchanger 12, unnecessary heat supply is drawn gas and is collected to desuperheat extraction steam pipe 11 by bypass 23.
The present embodiment to reclaim being used for drawing gas of external heat supply higher than the partial heat of saturation temperature or net quantity of heat, for heating boiler feed water, substitutes completely or Some substitute level or what bleeder heater.When matching principle according to the temperature of boiler feedwater return pipe 5 and heat supply extraction steam pipe 10, according to temperature cascade utilization principle, heat supply extraction temperature will match with boiler feed temperature, determines the progression of bleeder heater 1, and regenerative steam is corresponding steam turbine regenerative steam.When heat supply draw gas draw gas for resident's heating time, need a little more than this vapo(u)rous temperature from vapor-water heat exchanger 12 desuperheat extraction temperature out; When heat supply is drawn gas as extraction steam for factories, need match with vapor (steam) temperature needed for industrial user from vapor-water heat exchanger 12 desuperheat extraction temperature out, now supply stripping temperature temperature required a little more than industrial user.
It can be that extraction steam for factories or resident's heating are drawn gas that heat supply in the present embodiment is drawn gas, and bleeder heater 1 can be certain primary heater in power plant's heat regenerative system; The temperature of drawing gas according to boiler feedwater backwater and heat supply matches principle, determine the progression of bleeder heater 1, fully recycle the degree of superheat that heat supply is drawn gas, the real cascade utilization using energy, the energy consumption of further reduction steam power plant, improves the comprehensive energy utilization ratio of steam power plant.
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 (7)
1. the cascaded utilization of energy device for extraction for heat supply system, it is characterized in that: comprise bleeder heater, regenerative 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 arm one, bypass, boiler feedwater return branch, boiler feedwater water supply arm two and confession heat structure, described regenerative steam pipe is connected with bleeder heater, described boiler feedwater return pipe is all connected with bleeder heater with boiler feedwater feed pipe, one end of described boiler feedwater return branch is connected on boiler feedwater return pipe, the other end of this boiler feedwater return branch is connected on vapor-water heat exchanger, one end of described boiler feedwater water supply arm two is connected on vapor-water heat exchanger, the other end of this boiler feedwater water supply arm two is connected on boiler feedwater feed pipe, one end of described boiler feedwater water supply arm one is connected on boiler feedwater return pipe, the other end of this boiler feedwater water supply arm one is connected on boiler feedwater water supply arm two, described valve B is arranged on boiler feedwater return pipe, one end of described boiler feedwater return branch, valve B, one end and the bleeder heater of boiler feedwater water supply arm one are arranged in order along boiler feedwater return pipe, described valve A is arranged on boiler feedwater feed pipe, this valve A is between the other end and bleeder heater of boiler feedwater water supply arm two, described valve D is arranged in boiler feedwater return branch, described valve C is arranged on boiler feedwater water supply arm two, this valve C is between the other end and the other end of boiler feedwater water supply arm two of boiler feedwater water supply arm one, described valve E is arranged on boiler feedwater water supply arm one, described heat supply extraction steam pipe is all connected with vapor-water heat exchanger with desuperheat extraction steam pipe, one end of described bypass is connected on heat supply extraction steam pipe, the other end of this bypass is connected on desuperheat extraction steam pipe, described valve H is arranged in bypass, described valve F is arranged on heat supply extraction steam pipe, this valve F is between one end and vapor-water heat exchanger of bypass, described valve G is arranged on desuperheat extraction steam pipe, this valve G is between the other end and vapor-water heat exchanger of bypass, the described heat structure that supplies comprises steam drainage pipe, heat exchangers for district heating, heat supply network return pipe and heat supply network feed pipe, and described desuperheat extraction steam pipe, steam drainage pipe, heat supply network return pipe are all connected with heat exchangers for district heating with heat supply network feed pipe, or the described heat structure that supplies comprises reducing-and-cooling plant and industrial steam supply pipe, and described desuperheat extraction steam pipe is all connected with reducing-and-cooling plant with industrial steam supply pipe.
2. the cascaded utilization of energy device for extraction for heat supply system according to claim 1, is characterized in that: described bleeder heater is one or more in 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, No. 5 high-pressure heaters, No. 6 high-pressure heaters, No. 7 high-pressure heaters and No. 8 high-pressure heaters.
3. the cascaded utilization of energy device for extraction for heat supply system according to claim 1, is characterized in that: described reducing-and-cooling plant is replaced to waste heat overbottom pressure and utilizes device.
4. one kind uses the cascaded utilization of energy method of the cascaded utilization of energy device as described in claim 1 or 2 or 3, it is characterized in that: the step of described cascaded utilization of energy method is as follows: when comprising steam drainage pipe for heat structure, heat exchangers for district heating, when heat supply network return pipe and heat supply network feed pipe, first according to the principle that the temperature of boiler feedwater return pipe and heat supply extraction steam pipe matches, determine the progression of bleeder heater, then boiler feedwater enters bleeder heater and vapor-water heat exchanger respectively by boiler feedwater return pipe and boiler feedwater return branch, a road is accumulated after heat exchange, control valve C and valve E, for selecting the mode that is connected in series between vapor-water heat exchanger and bleeder heater or parallel, the aperture of control valve B and valve D, for the boiler feedwater flow regulating boiler feedwater return pipe and boiler feedwater return branch to enter bleeder heater and vapor-water heat exchanger respectively, after heat supply is drawn gas and is entered vapor-water heat exchanger by heat supply extraction steam pipe, heat exchange is carried out with the boiler feedwater in vapor-water heat exchanger, and enter heat exchangers for district heating by desuperheat extraction steam pipe, heat exchange is carried out with the heat supply network backwater in heat exchangers for district heating, the steam drainage formed returns the draining system of steam power plant by steam drainage pipe, heat supply network backwater is heated rear formation heat supply network and is supplied water, and be supplied to resident's heating by heat supply network feed pipe, the aperture of control valve F and valve H, for the heat supply extraction flow regulating heat supply extraction steam pipe to enter vapor-water heat exchanger, unnecessary heat supply is drawn gas and is collected to desuperheat extraction steam pipe by bypass,
Or, when comprising reducing-and-cooling plant and industrial steam supply pipe for heat structure, first according to the principle that the temperature of boiler feedwater return pipe and heat supply extraction steam pipe matches, determine the progression of bleeder heater, then boiler feedwater enters bleeder heater and vapor-water heat exchanger respectively by boiler feedwater return pipe and boiler feedwater return branch, a road is accumulated after heat exchange, control valve C and valve E, for selecting the mode that is connected in series between vapor-water heat exchanger and bleeder heater or parallel, the aperture of control valve B and valve D, for the boiler feedwater flow regulating boiler feedwater return pipe and boiler feedwater return branch to enter bleeder heater and vapor-water heat exchanger respectively, after heat supply is drawn gas and is entered vapor-water heat exchanger by heat supply extraction steam pipe, heat exchange is carried out with the boiler feedwater in vapor-water heat exchanger, and enter reducing-and-cooling plant by desuperheat extraction steam pipe and carry out further decrease temperature and pressure, then industrial steam supply is formed and by the directly externally heat supply of industrial steam supply pipe, the aperture of control valve F and valve H, for the heat supply extraction flow regulating heat supply extraction steam pipe to enter vapor-water heat exchanger, unnecessary heat supply is drawn gas and is collected to desuperheat extraction steam pipe by bypass.
5. the cascaded utilization of energy method for extraction for heat supply system according to claim 4, it is characterized in that: to reclaim being used for drawing gas of external heat supply higher than the partial heat of saturation temperature or net quantity of heat, what for heating boiler feed water, substitute completely or Some substitute level or bleeder heater.
6. the cascaded utilization of energy method for extraction for heat supply system according to claim 4, it is characterized in that: when matching principle according to the temperature of boiler feedwater return pipe and heat supply extraction steam pipe, according to temperature cascade utilization principle, heat supply extraction temperature will match with boiler feed temperature, determine the progression of bleeder heater, regenerative steam is corresponding steam turbine regenerative steam.
7. the cascaded utilization of energy method for extraction for heat supply system according to claim 4, is characterized in that: when heat supply draw gas draw gas for resident's heating time, need a little more than this vapo(u)rous temperature from vapor-water heat exchanger desuperheat extraction temperature out; When heat supply is drawn gas as extraction steam for factories, need match with vapor (steam) temperature needed for industrial user from vapor-water heat exchanger desuperheat extraction temperature out, now supply stripping temperature temperature required a little more than industrial user.
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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 |