CN205135735U - Thermal power system with heat supply of fused salt energy storage power - Google Patents
Thermal power system with heat supply of fused salt energy storage power Download PDFInfo
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- CN205135735U CN205135735U CN201520970016.5U CN201520970016U CN205135735U CN 205135735 U CN205135735 U CN 205135735U CN 201520970016 U CN201520970016 U CN 201520970016U CN 205135735 U CN205135735 U CN 205135735U
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The utility model discloses a thermal power system with heat supply of fused salt energy storage power, through setting up the bypass steam pipework, high pressure condenser and molten salt heater, load of power grid can save through the fused salt because of changing the steam heat that of having a favourable balance, pass through fused salt energy storage power generation subsystem at electric wire netting peak hours and participate in the peak regulation for mains supply, the low scheduling problem of electric wire netting peak regulation and power equipment utilization ratio has not only been solved from this, and guaranteed that power generation system has and has the generating efficiency that coal -fired power unit is suitable now, have and not only realize the power supply of energy storage varying duty but also guarantee high -efficient outstanding advantage of generating electricity.
Description
Technical field
The utility model belongs to thermal power generating technology, is specifically related to a kind of thermal power generation system of heat supply of powering with molten salt energy-storage.
Background technique
Along with living standards of the people raising and electric load increase fast, network load peak-valley difference expanding day.In electric power system, power supply and equipment for power transmission and distribution are all according to peak load of grid planning construction, but the peak load of grid endurance is shorter, cause the power equipment asset utilization ratio for meeting peak load demand and planning construction low.In addition; China's power supply architecture is based on thermoelectricity, and coal fired power generation accounts for 75% of gross generation, and a large amount of fired power generating unit is in shutdown or underrun state when non-electrical peak; not only make power equipment utilization ratio low, also make generator set operational reliability variation, decrease of power generation.Therefore solving peak load regulation network problem, raising power equipment asset utilization ratio and thermal power unit operation reliability, efficiency are the major issues that current power industry faces.Utilize energy storage technology significantly can improve total load coefficient and the actual operating efficiency of fired power generating unit generating, strengthen the ability to transmit electricity of electrical network.Thus, the thermal power generating technology researched and developed with energy-storage system be improve conventional energy resource generating and power transmission efficiency, improve power supply Security and Economy in the urgent need to.
In existing various energy storage technology, fused salt sensible heat heat storage technology possesses skills maturation, accumulation of heat advantage with low cost, has possessed the ability of large-scale commercial applications application, has been widely used at present in solar heat power generation system.
There is a kind of independent fused salt accumulation of heat power station at present: it is using fused salt mixt as accumulation of heat working medium, adopt the heating fused salt such as wind-powered electricity generation, photovoltaic electric thus heat accumulation, recycling fused salt heat accumulation when needed heating water produces water vapour, water vapour and then drive steam turbine and generator to realize fused salt accumulation of heat generating.Store surplus electric energy although this technical thought reaches thus electrical network is play a part to a certain extent " peak load shifting ", but because the heat → electric energy conversion efficiency at present based on steam Rankine cycle is 33 ~ 43%, there is certain shortcoming in the energy storing and electricity generating technology path of its " electricity → heat → electricity ", namely a large amount of high-quality electric energy is wasted in the transfer process by heat → electricity.When this system is coupled with fired power generating unit and applies, because system experienced by secondary by heat → electric process (fuel heat release → electricity → fused salt accumulation of heat → electricity), by the supercritical parameter steam Rankine cycle thermal efficiency 40%, the total generating efficiency of this system is only 16%, and now the inefficient shortcoming of this systems generate electricity is more outstanding.Consider the reality of China's power supply architecture based on thermoelectricity, the problems such as effective solution electrical network peak-valley difference need more efficient and rational energy storage thermal power generation system badly.
Model utility content
Technical problem to be solved in the utility model is to provide a kind of thermal power generation system of heat supply of powering with molten salt energy-storage, can solve peak load regulation network problem and the low problem of power equipment asset utilization ratio, can realize again reliably, efficiently generating electricity.
In order to solve the problems of the technologies described above, the utility model adopts following technological scheme:
On the one hand, a kind of thermal power generation system of heat supply of powering with molten salt energy-storage, comprising:
Thermal power generation subtense angle, comprise thermal power generation unit and high pressure condenser, thermal power generation unit comprises boiler, the first generator and the first steam turbine set, boiler is connected with the first steam turbine set by major steam line, steam is exported to the first steam turbine set, first steam turbine set is connected with high pressure condenser by reject steam pipeline, some vapor is transported to high pressure condenser, heat exchange through high pressure condenser condenses into water, high pressure condenser is connected with boiler by bypass delivery (pipe) line, and water of condensation is inputted boiler;
Molten salt energy-storage power generation sub-system, comprise the second generator, second steam turbine set, steam generator, molten salt heater and cold, hot melt salt cellar, molten salt heater one end is connected with high pressure condenser by circulation loop, and carry out heat exchange by intercycle working medium, the molten salt heater the other end by with hot melt salt cellar, steam generator, sloppy heat salt cellar is connected to form fused salt circulation loop, by molten salt heater the fused salt be stored in sloppy heat salt cellar added thermosetting hot melt salt and be stored in hot melt salt cellar, hot melt salt forms sloppy heat salt and is back to sloppy heat salt cellar again in steam generator after heat release, steam generator is connected with the second steam turbine set, steam Transportation to the second steam turbine set produced by steam generator generates electricity for it.
Described molten salt energy-storage power generation sub-system also comprises heat exchangers for district heating, and steam generator is connected with heat exchangers for district heating, by the condensation heat of steam in heat exchangers for district heating, to municipal heating systems direct heating.
Described intercycle working medium is water or conduction oil.
Described thermal power generation unit is Thermal generation unit or the thermal power generation unit using liquid or gaseous fuel.
The main feed line phase of described bypass delivery (pipe) line and the first steam turbine set is also connected to boiler after connecing again.
Adopt the thermal power generation system of heat supply of powering with molten salt energy-storage of the present utility model, tool has the following advantages:
1, boiler heat release can be stored in fused salt tank when electrical network low ebb load, therefore boiler can long-time running under the higher load condition that unit power supply efficiency is higher, because network load change, steam thermal energy that surplus goes out can be stored, and is that mains supply participates in peak regulation when peak load of grid by molten salt energy-storage power generation sub-system.
2, the heat energy be stored in fused salt tank both can form high temperature and high pressure steam by heating water and then drive molten salt energy-storage power generation sub-system to generate electricity, and also directly in order to heat municipal heating systems circulating water thus to carry out heat supply, or can generate electricity and heat supply cooperation.
3, use high pressure vapour condenser (its pressure is not less than 2.5MPa), both can simplify system flow and reduce manufacturing equipment, and also meet the requirement of the safe and reliable operating temperature range of fused salt simultaneously.
4, avoid " heat → electricity → heat " in energy-storage system in the past and change the huge energy loss brought, not only solve peak load regulation network thus and the problem such as power equipment utilization ratio is low, and ensure that power generation system has the generating efficiency suitable with existing fired power generating unit, there is the outstanding advantage not only realizing energy storage varying duty and power but also ensure efficiency power generation.
5, technological process is easy, and engineering feasibility is fine, without the need to researching and developing new Prime Parts of Power Plant Equipment boiler and steam turbine just can realize maximization engineer applied.
6, because boiler controller system can run for a long time under the higher load condition of thermal performance the best, both improve fired power generating unit generating efficiency thus obtained economic benefits of power generating and reduce discharging environmental benefit, also achieve the object improving power equipment asset utilization ratio, also there is the effect reducing boiler controller system failure risk and maintenance cost.
Accompanying drawing explanation
Fig. 1 is the schematic diagram (coal-fired embodiment) of thermal power generation system of heat supply of powering with molten salt energy-storage of the present utility model.
Embodiment
Of the present utility model with molten salt energy-storage power heat supply thermal power generation system as shown in Figure 1, it mainly comprises thermal power generation subtense angle (see Fig. 1 left side dotted line frame) and molten salt energy-storage power generation sub-system (see dotted line frame on the right of Fig. 1), by intercycle working medium (working medium can be water, also can be heat conduction wet goods fluid) transferring heat between two subtense angles.
Specifically, described thermal power generation subtense angle comprises thermal power generation unit, and the Thermal generation unit that this thermal power generation unit can adopt the China shown in Fig. 1 widely to apply can also adopt other the thermal power generation unit using liquid or gaseous fuel certainly.For Thermal generation unit, it mainly comprises boiler, the first generator 1, first steam turbine set 2 and pulverizing system, burner 7, gas fan, dust pelletizing system, desulphurization system, chimney etc., the working principle of this thermal power generation subtense angle is identical with conventional thermal power generation system, mainly pass through boiler develops steam vapor, be connected with the first steam turbine set 2 by major steam line, steam is exported to the first steam turbine set 2, carry out thermal power generation, again the water formed after steam-condensation is back to boiler, as boiler feed water by main feed line 4 and the first feed water pump 3a.Unlike, this thermal power generation subtense angle also comprises high pressure condenser 5, first steam turbine set 2 is also provided with the reject steam pipeline 6 be connected with high pressure condenser 5, by reject steam pipeline 6, some vapor is transported to high pressure condenser 5, heat exchange through high pressure condenser 5 condenses into water, then is delivered to boiler by high pressure condenser 5 after connecing again is fed water by main feed line 4 phase of bypass delivery (pipe) line and the second feed water pump 3b and the first steam turbine set 2.
The work of described molten salt energy-storage power generation sub-system is similar to the working principle that the fused salt accumulation of heat in existing solar heat power generation system generates electricity, and is distinguished as the steam thermal energy that thermal source of the present utility model comes from boiler output.Specifically, this molten salt energy-storage power generation sub-system comprises the second generator 9, second steam turbine set 10, steam generator 11, molten salt heater 12 and cold, hot melt salt cellar etc., molten salt heater 12 one end is connected with high pressure condenser 5 by circulation loop 13, and carry out heat exchange by recycle pump 8 and intercycle working medium, molten salt heater 12 the other end by with hot melt salt cellar, hot salt pump 14b, steam generator 11, sloppy heat salt cellar, cold salt pump 14a is connected to form fused salt circulation loop, when electrical network low-load, by molten salt heater 12 fused salt be stored in sloppy heat salt cellar added thermosetting hot melt salt and be stored in hot melt salt cellar, when electrical network high load, hot melt salt in hot melt salt cellar is delivered to steam generator 11, heat release in steam generator 11, sloppy heat salt cellar is back to again for forming sloppy heat salt after steam generator heat supply generation steam, steam generator 11 is connected with the second steam turbine set 10, its drive electrical generators of confession of steam Transportation to the second steam turbine set 10 produced by steam generator generates electricity.
As an embodiment, described molten salt energy-storage power generation sub-system also comprises heat exchangers for district heating 15, and steam generator 11 is connected with heat exchangers for district heating 15, by the heat release of steam in heat exchangers for district heating 15, to municipal heating systems direct heating.Certainly, fused salt heat release also can adopt generating and heat supply to carry out simultaneously.
Described intercycle working medium can adopt water or conduction oil.
Should to power with molten salt energy-storage the electricity-generating method of thermal power generation system of heat supply, mainly to comprise the following steps:
A. produce steam by boiler burning, enter the first steam turbine set 2 by major steam line and carry out thermal power generation;
B. by the first steam turbine set 2, some vapor is transported to high pressure condenser 5 by reject steam pipeline 6, steam is condensed into water by the cooling of intercycle working medium in high pressure condenser 5, and after being mixed with the boiler feed water in the main feed line 4 from the first steam turbine set 2 by bypass delivery (pipe) line, jointly for boiler feeds water;
C. by molten salt heater 12 by the thermal energy storage after heat exchange in hot melt salt cellar;
D. the heat energy that hot melt salt cellar stores is used for steam generator 11 and produces steam, generate electricity for the second steam turbine set 10, be that mains supply participates in peak regulation when peak load of grid, also steam generator 11 can be produced steam and directly heat supply be carried out to municipal heating systems by heat exchangers for district heating 15.
For ensureing that fused salt does not solidify, the cold junction temperature of intercycle working medium needs the lower bound of a little higher than fused salt serviceability temperature scope.In the present system, optional water temperature of drawing exit of pump is identical or close with the feed temperature of the first steam turbine set 2, thus system flow is greatly simplified, and engineering feasibility is better.Thus, the cold junction temperature of intercycle working medium is boiler feed temperature and high pressure vapour condenser cold junction terminal temperature difference sum.By common Large-scale fire-electricity unit feed temperature and choose rational high pressure vapour condenser cold junction terminal temperature difference, the cold junction temperature of known intercycle working medium is between 280 ~ 350 DEG C of scopes, and this temperature is in the common lower bound temperature range of current fused salt mixt.Thus, use high pressure vapour condenser can simplify whole system flow process, reduce manufacturing equipment, also meet the requirement of the safe and reliable operating temperature range of fused salt, the technological scheme therefore shown in Fig. 1 is feasible in engineer applied simultaneously.
When operation of electric power system described in the utility model, boiler controller system can long-time running under the higher load condition that unit power supply efficiency is higher, because network load change, steam thermal energy that surplus goes out can be stored by molten salt energy-storage power generation sub-system, is that mains supply participates in peak regulation when peak load of grid by molten salt energy-storage power generation sub-system.The heat energy be stored in hot melt salt cellar both can form high temperature and high pressure steam by heating water, and then drive the second steam turbine set 10 and the second generator 9 to generate electricity, also directly in order to heat municipal heating systems circulating water thus to carry out heat supply, or can generate electricity and heat supply cooperation.
Outstanding advantages of the present utility model is: because of the joint work in high pressure vapour condenser, molten salt heater 12 and intercycle working medium, the sensible heat of boiler output steam and latent heat are all recovered and are stored in hot melt salt cellar, and the effective utilization heat being equivalent to original boiler is all stored by fused salt.Thus, power generation system described in the utility model avoids " heat → electricity → heat " in energy-storage system in the past and changes the huge energy loss brought, not only solve peak load regulation network thus and the problem such as power equipment utilization ratio is low, and ensure that power generation system has the generating efficiency suitable with existing fired power generating unit, there is the outstanding advantage not only realizing energy storage varying duty and power but also ensure efficiency power generation.
In addition, adopt high pressure vapour condenser heating intercycle working medium thus carry out accumulation of heat, avoiding and directly heat by boiler smoke boiler heating surface complex system that intercycle working medium brings and boiler operatiopn is difficult to the problems such as regulable control.Therefore the realization of system described in the utility model there is no particular/special requirement to existing boiler and steam-turbine plant, therefore the technological scheme that the utility model proposes to have technological process easy, the good advantage of engineering feasibility, without the need to researching and developing new Prime Parts of Power Plant Equipment boiler and steam turbine just can realize maximization engineer applied.
And, because boiler controller system runs for a long time under the higher load condition of thermal performance the best, both improve fired power generating unit generating efficiency thus obtained energysaving effectiveness and reduce discharging environmental benefit, also achieve the object improving power equipment asset utilization ratio, also there is the effect reducing boiler controller system failure risk and maintenance cost.
Although the utility model has had more a set of molten salt energy-storage power generation sub-system, correspondingly increase the investment of a part of power plant, but achieve under the condition of not newly-increased new-built unit simultaneously, significantly improve power station power supply capacity, both eliminated thus and built and safeguarded the expense of regulating units, and also eliminated from outer net power transmission thus ensure a large sum of power grid construction expense of power grid security.All in all, system described in the utility model still has significant investment economy.
But, those of ordinary skill in the art will be appreciated that, above embodiment is only used to the utility model is described, and be not used as restriction of the present utility model, as long as in spirit of the present utility model, all will drop in Claims scope of the present utility model the change of the above embodiment, modification.
Claims (5)
1. to power with molten salt energy-storage the thermal power generation system of heat supply, it is characterized in that, comprising:
Thermal power generation subtense angle, comprise thermal power generation unit and high pressure condenser, thermal power generation unit comprises boiler, the first generator and the first steam turbine set, boiler is connected with the first steam turbine set by major steam line, steam is exported to the first steam turbine set, first steam turbine set is connected with high pressure condenser by reject steam pipeline, some vapor is transported to high pressure condenser, heat exchange through high pressure condenser condenses into water, high pressure condenser is connected with boiler by bypass delivery (pipe) line, and water of condensation is inputted boiler;
Molten salt energy-storage power generation sub-system, comprise the second generator, second steam turbine set, steam generator, molten salt heater and cold, hot melt salt cellar, molten salt heater one end is connected with high pressure condenser by circulation loop, and carry out heat exchange by intercycle working medium, the molten salt heater the other end by with hot melt salt cellar, steam generator, sloppy heat salt cellar is connected to form fused salt circulation loop, by molten salt heater the fused salt be stored in sloppy heat salt cellar added thermosetting hot melt salt and be stored in hot melt salt cellar, hot melt salt forms sloppy heat salt and is back to sloppy heat salt cellar again in steam generator after heat release, steam generator is connected with the second steam turbine set, steam Transportation to the second steam turbine set produced by steam generator generates electricity for it.
2. the thermal power generation system of heat supply of powering with molten salt energy-storage according to claim 1, it is characterized in that: described molten salt energy-storage power generation sub-system also comprises heat exchangers for district heating, steam generator is connected with heat exchangers for district heating, by the heat release of steam in heat exchangers for district heating to municipal heating systems direct heating.
3. the thermal power generation system of heat supply of powering with molten salt energy-storage according to claim 1, is characterized in that: described intercycle working medium is water or conduction oil.
4. the thermal power generation system of heat supply of powering with molten salt energy-storage according to claim 1, is characterized in that: described thermal power generation unit is Thermal generation unit or the thermal power generation unit using liquid or gaseous fuel.
5. the thermal power generation system of heat supply of powering with molten salt energy-storage according to claim 1, is characterized in that: the main feed line phase of described bypass delivery (pipe) line and the first steam turbine set is also connected to boiler after connecing again.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105351018A (en) * | 2015-11-27 | 2016-02-24 | 上海援梦电力能源科技咨询中心 | Thermal power generation system and method with fused salt energy storage, power supply and heat supply functions |
| CN107091586A (en) * | 2017-03-15 | 2017-08-25 | 浙江大学 | Boiler fired coal electricity generation system with double tank heat storage type generating adjustments |
| CN107246289A (en) * | 2017-06-30 | 2017-10-13 | 华电电力科学研究院 | The device and its method of work of peak-load regulation are realized in a kind of utilization fuse salt accumulation of heat |
| CN114060110A (en) * | 2021-11-16 | 2022-02-18 | 西安热工研究院有限公司 | Bypass heating heat cascade utilization system and method capable of supplying black start power supply |
-
2015
- 2015-11-27 CN CN201520970016.5U patent/CN205135735U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105351018A (en) * | 2015-11-27 | 2016-02-24 | 上海援梦电力能源科技咨询中心 | Thermal power generation system and method with fused salt energy storage, power supply and heat supply functions |
| CN107091586A (en) * | 2017-03-15 | 2017-08-25 | 浙江大学 | Boiler fired coal electricity generation system with double tank heat storage type generating adjustments |
| CN107246289A (en) * | 2017-06-30 | 2017-10-13 | 华电电力科学研究院 | The device and its method of work of peak-load regulation are realized in a kind of utilization fuse salt accumulation of heat |
| CN107246289B (en) * | 2017-06-30 | 2023-04-14 | 华电电力科学研究院有限公司 | Device for realizing peak regulation of power station by utilizing fused salt heat storage and working method thereof |
| CN114060110A (en) * | 2021-11-16 | 2022-02-18 | 西安热工研究院有限公司 | Bypass heating heat cascade utilization system and method capable of supplying black start power supply |
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