阅读说明：本技术 回热式交替储能发电系统 (Back-heating type replaces energy-storing and power-generating system ) 是由 卢恒 邹杨 戴叶 贾国斌 陈兴伟 袁晓凤 于 2019-08-23 设计创作，主要内容包括：本发明提供一种回热式交替储能发电系统,其包括第一蓄热系统、第二蓄热系统、中间换热器、压缩机、透平和散热器,并形成两种可切换的排布方式：压缩机、中间换热器、第一蓄热系统、透平、中间换热器、第二蓄热系统和散热器沿工作介质的走向依次串联；第二蓄热系统、中间换热器、压缩机、第一蓄热系统、中间换热器、透平和散热器沿工作介质的走向依次串联；第一蓄热系统、第二蓄热系统、中间换热器为共用的。本发明的回热储能发电系统由中间换热器带来了回热功能,提高了高温工作点的使用温度,改善了压缩机的工作条件。减少热损失,提高转换效率。为解决光伏发电以及风能发电中的弃光、风问题以及峰谷电的削峰填谷问题提供了思路。(The present invention provides a kind of back-heating type alternating energy-storing and power-generating system, it includes the first hold over system, the second hold over system, Intermediate Heat Exchanger, compressor, turbine and radiator, and forms two kinds of changeable arrangement modes: compressor, Intermediate Heat Exchanger, the first hold over system, turbine, Intermediate Heat Exchanger, the second hold over system and radiator are sequentially connected in series along the trend of working media；Second hold over system, Intermediate Heat Exchanger, compressor, the first hold over system, Intermediate Heat Exchanger, turbine and radiator are sequentially connected in series along the trend of working media；First hold over system, the second hold over system, Intermediate Heat Exchanger are to share.Backheat energy-storing and power-generating system of the invention brings backheating function by Intermediate Heat Exchanger, improves the use temperature of hot operation point, improves the operating condition of compressor.Heat loss is reduced, transfer efficiency is improved.To solve the problems, such as that the peak load shifting problem of abandoning light, wind and peak-trough electricity in photovoltaic power generation and wind power generation provides thinking.)

1. a kind of back-heating type replaces energy-storing and power-generating system, it is characterised in that: it include the first hold over system, the second hold over system, Intermediate Heat Exchanger, compressor, turbine and radiator, and form two kinds of changeable arrangement modes:

(1) correspond to power generation mode, the compressor, the Intermediate Heat Exchanger, first hold over system, the turbine, institute Intermediate Heat Exchanger, second hold over system and the radiator is stated to be sequentially connected in series along the trend of working media；

(2) correspond to energy storage mode, second hold over system, the Intermediate Heat Exchanger, the compressor, first accumulation of heat System, the Intermediate Heat Exchanger, the turbine and the radiator are sequentially connected in series along the trend of working media；

In both changeable arrangement modes, first hold over system, second hold over system, the intermediate heat exchange Device is to share.

2. back-heating type according to claim 1 replaces energy-storing and power-generating system, which is characterized in that the compressor includes that can cut The energy storage compressor and power generation compressor changed, the turbine includes changeable energy storage turbine and power turbine.

3. back-heating type according to claim 1 replaces energy-storing and power-generating system, which is characterized in that the first hold over system packet The first phase transformation heat-storage module and the second phase transformation heat-storage module being one another in series are included, second hold over system includes being one another in series First liquid heat storage module and second liquid accumulation of heat module.

4. back-heating type according to claim 3 replaces energy-storing and power-generating system, which is characterized in that the first liquid heat storage mould Block includes at least two interconnected and internal different heat storage medium cool-bags of heat storage medium temperature and is connected to the storage The first fluid-gas heat exchanger or at least one interconnected and internal heat storage medium tool between thermal medium cool-bag Have between the heat storage medium cool-bag of temperature gradient and the different temperature difference regions for being connected to the heat storage medium cool-bag First fluid-gas heat exchanger；

And the second liquid accumulation of heat module includes that the different accumulation of heat of at least two interconnected and internal heat storage medium temperatures is situated between Vacuum container and the second liquid-gas heat exchanger being connected between the heat storage medium cool-bag or at least one It is interconnected and internal heat storage medium has the heat storage medium cool-bag of temperature gradient and is connected to the heat storage medium heat preservation Second liquid-gas heat exchanger between the different temperature difference regions of container.

5. back-heating type according to claim 3 replaces energy-storing and power-generating system, which is characterized in that the first liquid heat storage mould Block and the heat storage medium of the second liquid accumulation of heat module are by water, aqueous solution, organic solution, conduction oil, fused salt and metal At least one composition.

6. back-heating type according to claim 5 replaces energy-storing and power-generating system, which is characterized in that the first liquid heat storage mould The heat storage medium of block is conduction oil, the conduction oil be include that alkyl benzene-type conduction oil, alkylnaphthalene type conduction oil, alkyl biphenyl type are led The heat carrier of at least one of hot oil, biphenyl and eutectic biphenyl-ether mixture type conduction oil and alkyl biphenyl-ether conduction oil Oil；The heat storage medium of the second liquid accumulation of heat module includes fused salt, which includes nitrate, sulfate, villaumite and villiaumite At least one of.

7. back-heating type according to claim 3 replaces energy-storing and power-generating system, which is characterized in that the first liquid heat storage mould The regenerator temperature range of block is 20 to 275 DEG C, and the regenerator temperature range of the second liquid accumulation of heat module is 275 to 494 DEG C.

8. back-heating type according to claim 3 replaces energy-storing and power-generating system, which is characterized in that the first phase-transition heat-storage mould Block and the second phase transformation heat-storage module include multiple trends along working media successively arrangement and heat preservation with working media heat exchange Cavity, each heat-insulated cavity are interior comprising there are many heat-storing sphere or many kinds of solids sensible heat heat-storing materials.

9. back-heating type according to claim 8 replaces energy-storing and power-generating system, which is characterized in that the heat-storing sphere includes involucrum With the phase-change heat accumulation medium for the inside for being filled in the involucrum, the phase-change heat accumulation medium is fused salt simple substance, molten salt mixture or conjunction Gold.

10. back-heating type according to claim 3 replaces energy-storing and power-generating system, which is characterized in that first phase-transition heat-storage The regenerator temperature range of module is 650 DEG C to 1000 DEG C, the regenerator temperature range of second phase transformation heat-storage module be 250 DEG C extremely 650℃。

11. a kind of back-heating type replaces energy storing and electricity generating method, which is characterized in that this method utilizes one of -10 institute according to claim 1 The back-heating type alternating energy-storing and power-generating system stated comprising following mode:

(1) power generation mode: working media passes through compressor compresses, by Intermediate Heat Exchanger heat release, is inhaled by the first hold over system Heat enters turbine expansion later, absorbs heat by Intermediate Heat Exchanger, then by the second hold over system heat release, finally by radiator Heat dissipation, subsequently back into compressor and repeats the above process；The function exported only in the process is for generating electricity；

(2) energy storage mode: working media first passes through the heat absorption of the second hold over system, by Intermediate Heat Exchanger heat release, by compressor Compression, using the first hold over system heat release, absorbs heat by Intermediate Heat Exchanger, enters turbine expansion later, subsequently back into second Hold over system simultaneously repeats the above process.

12. back-heating type according to claim 11 replaces energy storing and electricity generating method, which is characterized in that working media includes sky Gas, argon gas, nitrogen, helium, vapor or carbon dioxide.

Technical field

The present invention relates to a kind of back-heating types to replace energy-storing and power-generating system.

Background technique

Sustainable development Calling for Green, low-carbon, the sustainable energy of human society.Instantly, the renewable energy such as sun Can, the Main way that wind energy has become industry focal point and the mode of production and life is changed.Since solar energy, wind power generation have Intermittent and fluctuation, in addition current energy storage material and technology do not catch up with the fast development of renewable energy.Abandonment, optical phenomenon are Through becoming renewable energy power stumbling-block preventing the development.Develop that heat to power output is more efficient, the better energy storing and electricity generating of operating condition Technology is imperative.

Energy storage can be divided into physics energy storage and chemical energy storage.The usual capacity of chemical energy storage is smaller, complete period low efficiency, it is difficult to Meets the needs of large capacity, high efficiency energy storage.In physics energy storage, the energy storage efficiency that draws water is higher, is current relatively inexpensive and mature Energy storage method, but limited by geographic factor.In contrast, hot energy storage has the characteristics that large capacity, low cost, can be for a long time Ground carries out energy storage, solves the problems, such as that power grid matches.However the energy conversion efficiency of hot energy storage is lower, it is therefore desirable to consider to improve storage The means of energy generating efficiency play its cheap and large capacity advantage.

When energy storage and power generation, need to carry out electric-thermal conversion and thermo-electrically conversion, thermal storage and energy accumulation is easy to bring lower conversion Efficiency.In order to improve transfer efficiency, the endless form using heat pump heat engine is a kind of effective means.Typically, Heat Pump In machine circulation, the temperature of circulation high temperature operating point and the temperature difference of high temperature and low-temperature working point are improved, circulation effect can be improved Rate.Therefore, seek the method for raising hot operation point just at one of the emphasis of research.

At the same time, the price of accumulation of heat module is reduced, the capacity for improving accumulation of heat module is also one of the emphasis of research.It uses Liquid heat storage, solid heat storage or phase-transition heat-storage, these heat storage types have the characteristics of cheap and large capacity, but concrete application has It is distinguished.Liquid heat storage is limited to the fusing point of liquid, boiling point, and high boiling liquid, such as fused salt or liquid metal, corrosion Property it is stronger, used temperature limiting by container and pipeline material again using temperature.Solid heat storage can have higher accumulation of heat temperature Degree, but when its accumulation of heat and heat release, it may occur that temperature change needs longer runner, at this time to guarantee the stabilization of outlet temperature Effective accumulation of heat factor is also adversely affected.The advantages of phase transformation heat-storage module both combines, transformation temperature be provided about compared with Big amount of stored heat, and lesser temperature change is kept, after passing through working media, temperature is relatively stable.Therefore, this patent attempts In conjunction with kind of heat pump back-heating type alternating energy-storing and power-generating system and a phase transformation heat-storage module, energy storing and electricity generating efficiency with higher, simultaneously Structure is simple, and the operation is stable has economy.

Summary of the invention

The efficient alternative expression energy storage for power supply method and device with backheating function that the purpose of the present invention is to provide a kind of, with The disadvantage for overcoming traditional electric heating heat storage medium energy storage mode transfer efficiency low, while solving photovoltaic power generation and wind power generation In abandonment, optical issue.

The present invention is to solve above-mentioned technical problem by following technical proposals:

The present invention provides a kind of back-heating type alternating energy-storing and power-generating system comprising the first hold over system, the second hold over system, Intermediate Heat Exchanger, compressor, turbine and radiator, and form two kinds of changeable arrangement modes:

(1) correspond to power generation mode, it is the compressor, the Intermediate Heat Exchanger, first hold over system, described Flat, described Intermediate Heat Exchanger, second hold over system and the radiator are sequentially connected in series along the trend of working media；

(2) correspond to energy storage mode, second hold over system, the Intermediate Heat Exchanger, the compressor, described first Hold over system, the Intermediate Heat Exchanger, the turbine and the radiator are sequentially connected in series along the trend of working media；

In both changeable arrangement modes, first hold over system, second hold over system, the centre Heat exchanger is to share.

The compressor includes changeable energy storage compressor and power generation compressor, and the turbine includes changeable energy storage Turbine and power turbine.

First hold over system includes the first phase transformation heat-storage module and the second phase transformation heat-storage module being one another in series, described Second hold over system includes the first liquid heat storage module and second liquid accumulation of heat module being one another in series.

The first liquid heat storage module includes the different accumulation of heat of at least two interconnected and internal heat storage medium temperatures Medium heat-preserving container and the first fluid-gas heat exchanger being connected between the heat storage medium cool-bag, or at least one A interconnected and internal heat storage medium, which has the heat storage medium cool-bag of temperature gradient and is connected to the heat storage medium, to be protected The first fluid-gas heat exchanger between the different temperature difference regions of warm container；And the second liquid accumulation of heat module includes at least The different heat storage medium cool-bag of two interconnected and internal heat storage medium temperatures is kept the temperature with the heat storage medium is connected to Second liquid-gas heat exchanger or at least one interconnected and internal heat storage medium between container have temperature gradient Heat storage medium cool-bag and be connected to the heat storage medium cool-bag different temperature difference regions between second liquid-gas Body heat exchanger.

The heat storage medium of the first liquid heat storage module and the second liquid accumulation of heat module is by water, aqueous solution, organic At least one of solution, conduction oil, fused salt and metal composition.

The heat storage medium of the first liquid heat storage module be conduction oil, the conduction oil be include alkyl benzene-type conduction oil, Alkylnaphthalene type conduction oil, alkyl biphenyl type conduction oil, biphenyl and eutectic biphenyl-ether mixture type conduction oil and alkyl biphenyl- The heat medium oil of at least one of ether conduction oil；The heat storage medium of the second liquid accumulation of heat module includes fused salt, the fused salt Including at least one of nitrate, sulfate, villaumite and villiaumite.

The regenerator temperature range of the first liquid heat storage module is 20 to 275 DEG C, the second liquid accumulation of heat module Regenerator temperature range is 275 to 494 DEG C.

First phase transformation heat-storage module and the second phase transformation heat-storage module include that multiple trends along working media are successively arranged Cloth and heat-insulated cavity with working media heat exchange, comprising there are many heat-storing spheres or many kinds of solids sensible heat to store in each heat-insulated cavity Hot material.

The heat-storing sphere includes the phase-change heat accumulation medium of involucrum with the inside for being filled in the involucrum, the phase-change heat accumulation medium For fused salt simple substance, molten salt mixture or alloy.

The regenerator temperature range of first phase transformation heat-storage module is 650 DEG C to 1000 DEG C, the second phase-transition heat-storage mould The regenerator temperature range of block is 250 DEG C to 650 DEG C.

On the other hand, the present invention provides a kind of back-heating type alternating energy storing and electricity generating method, which is characterized in that this method utilizes root Replace energy-storing and power-generating system according to back-heating type described above comprising following mode:

(1) power generation mode: working media passes through the first accumulation of heat system by Intermediate Heat Exchanger heat release by compressor compresses System heat absorption, enters turbine expansion later, absorbs heat by Intermediate Heat Exchanger, then by the second hold over system heat release, finally by scattered Hot device heat dissipation, subsequently back into compressor and repeats the above process；The function exported only in the process is for generating electricity；

(2) energy storage mode: working media first passes through the heat absorption of the second hold over system, by Intermediate Heat Exchanger heat release, through over-voltage The compression of contracting machine, using the first hold over system heat release, absorbs heat by Intermediate Heat Exchanger, enters turbine expansion later, subsequently back into Second hold over system simultaneously repeats the above process.

Working media includes air, argon gas, nitrogen, helium, vapor or carbon dioxide.

The positive effect of the present invention is that:

Backheat energy-storing and power-generating system of the invention brings backheating function by Intermediate Heat Exchanger, improves hot operation point Using temperature, the operating condition of compressor is improved.Heat loss is reduced, transfer efficiency is improved.To solve photovoltaic power generation and wind The peak load shifting problem of abandoning light, wind problem and peak-trough electricity in capable of generating electricity provides thinking.In addition, backheat energy storage of the invention Electricity generation system is by setting each heat-insulated cavity in phase transformation heat-storage module to comprising there are many heat-storing spheres or many kinds of solids to show Thermal regenerator material to match different temperatures of first hold over system from import to outlet, while stablizing entrance temperature, while Regenerative capacity can be improved.

Detailed description of the invention

Figure 1A-Figure 1B is that the structure for replacing thermal storage and energy accumulation electricity generation system according to the back-heating type of one embodiment of the present of invention is shown It is intended to, wherein Figure 1A shows the alternating thermal storage and energy accumulation electricity generation system of the back-heating type under power generation mode, and Figure 1B shows energy storage mode Under back-heating type replace thermal storage and energy accumulation electricity generation system.

Fig. 2 is the structural schematic diagram according to first hold over system of one embodiment of the present of invention.

Fig. 3 is the structural schematic diagram according to second hold over system of one embodiment of the present of invention.

Fig. 4 is the structural schematic diagram according to first and second phase transformation heat-storage modules of one embodiment of the present of invention.

Fig. 5 is the structural representation according to the heat-storing sphere of first and second phase transformation heat-storage modules of one embodiment of the present of invention Figure.

Specific embodiment

With reference to the accompanying drawing, presently preferred embodiments of the present invention is provided, and is described in detail, makes to be better understood when this hair Bright function, feature.

The present embodiment describes a kind of back-heating type alternating thermal storage and energy accumulation electricity generation system, as seen in figs. 1 a-1b, thermal storage and energy accumulation power generation System includes compressor 1, turbine 2, the first hold over system 3, the second hold over system 4, radiator 5 and Intermediate Heat Exchanger 6.Wherein, Compressor 1 includes changeable energy storage compressor 11 and power generation compressor 12, and turbine 2 includes changeable energy storage turbine 21 and hair Electric turbine 22, for the switch operating under power generation mode and energy storage mode.First hold over system 3 includes the first phase being one another in series Become accumulation of heat module 31 and the second phase transformation heat-storage module 32, the second hold over system 4 includes the first liquid heat storage module being one another in series 41 and second liquid accumulation of heat module 42, the temperature in each hold over system is obtained by the heat storage medium in two module as a result, To widen, and avoid heat loss excessive caused by excessive module；The first phase transformation heat-storage module in first hold over system 3 31 and second phase transformation heat-storage module 32 sequence, the first liquid heat storage module 41 of the second hold over system 4 and second liquid accumulation of heat The sequence of module 42 can be interchangeable, therefore sequence is not fixed.First hold over system 3, the second hold over system 4, heat dissipation Device 5 and Intermediate Heat Exchanger 6 share under power generation mode and energy storage mode, and energy storage compressor 11 and power generation compressor 12, energy storage Turbine 21 and power turbine 22 share not under power generation mode and energy storage mode.

As shown in Figure 1A, in generate mode, compressor 12, Intermediate Heat Exchanger 6, the first hold over system 3, power generation are generated electricity thoroughly Flat 22, the Intermediate Heat Exchanger 6, the second hold over system 4 and radiator 5 are sequentially connected in series along the trend of working media by connecting pipe And it is formed into a loop；As shown in Figure 1B, under energy storage mode, the second hold over system 4, Intermediate Heat Exchanger 6, energy storage compressor 11, One hold over system 3, the Intermediate Heat Exchanger 6, energy storage turbine 21 and radiator 5 along working media trend by connecting pipe successively It connects and is formed into a loop, in work, working media is driven in pipeline and each equipment by energy storage compressor 11 or power generation compressor 12 It is dynamic.First hold over system, 3 heat release as a result, 4 accumulation of heat of the second hold over system；Under energy storage mode, 3 accumulation of heat of the first hold over system, the Two hold over systems, 4 heat release.In this example, working media is air.The specified accumulation of energy power 2MW of thermal storage and energy accumulation electricity generation system, specified hair Electrical power 1MW, total energy storage power generation capacity are 24MWh.

As shown in figure 3, in the present embodiment, the first liquid heat storage module 41 is conduction oil accumulation of heat module comprising high temperature The thermally conductive oil tank 412 of thermally conductive oil tank 411, low temperature and it is connected to the high-temperature heat-conductive oil tank 411 and the thermally conductive oil tank of low temperature The first fluid-gas heat exchanger 413 comprising a heat exchange pipeline between 412 thus forms two interconnected and inside The different heat storage medium cool-bag of heat storage medium temperature, and first by being connected between two heat storage medium cool-bags Fluid-gas heat exchanger 413 exchanges heat with working media.In high-temperature heat-conductive oil tank 411 and the thermally conductive oil tank 412 of low temperature Liquid pump 414 is installed and is connected by the pump for liquid salts 414 with the heat exchange pipeline of the first fluid-gas heat exchanger 413, is mentioned The power transported for conduction oil.When working media absorbs heat, the high-temperature heat-conductive oil tank 411 and low temperature of the first liquid heat storage module 41 Heat storage medium temperature in thermally conductive oil tank 412 is constant, and heat storage medium enters low temperature conduction oil by high-temperature heat-conductive oil tank 411 and stores up Tank 412 is to complete to exchange heat.When working media heat release, the high-temperature heat-conductive oil tank 411 and low temperature of the first liquid heat storage module 41 Heat storage medium temperature in thermally conductive oil tank 412 is constant, and heat storage medium enters high temperature heat conductive oil by the thermally conductive oil tank 412 of low temperature and stores up Tank 411 is to complete to exchange heat.The regenerator temperature range of the first liquid heat storage module 41 is 20 to 275 DEG C, wherein described first The heat storage medium of liquid heat storage module 41 be conduction oil, the conduction oil be include alkyl benzene-type conduction oil, alkylnaphthalene type conduction oil, In alkyl biphenyl type conduction oil, biphenyl and eutectic biphenyl-ether mixture type conduction oil and alkyl biphenyl-ether conduction oil at least A kind of heat medium oil.In other embodiments, the heat storage medium of the first liquid heat storage module 41 can also be by water, water-soluble At least one of liquid, organic solution, conduction oil, fused salt and metal composition.

In addition, the first liquid heat storage module 41 can also include at least two interconnected and internal heat storage medium temperature Spend different heat storage medium cool-bags and the first fluid-gas being connected between heat storage medium cool-bag heat exchange Device, or heat storage medium cool-bag and connection including at least one interconnected and internal heat storage medium with temperature gradient The first fluid-gas heat exchanger between the different temperature difference regions of the heat storage medium cool-bag, with for enter the The working media of two hold over systems 4 exchanges heat.

As shown in Fig. 2, in the present embodiment, second liquid accumulation of heat module 42 is fused salt accumulation of heat module, including high-temperature molten salt It storage tank 421, low-temperature molten salt storage tank 422 and is connected between the salt storage tank 421 and low-temperature molten salt storage tank 422 and includes Second liquid-gas heat exchanger 423 of one heat exchange pipeline thus forms two interconnected and internal heat storage medium temperatures not Same heat storage medium cool-bag, and second liquid-gas converting heat by being connected between two heat storage medium cool-bags Device 423 exchanges heat with working media.Pump for liquid salts 424 is mounted on simultaneously in salt storage tank 421 and low-temperature molten salt storage tank 422 It is connected by the pump for liquid salts 424 with the heat exchange pipeline of the second liquid-gas heat exchanger 423, is transported for providing fused salt Power.When working media absorbs heat as a result, the salt storage tank 421 and low-temperature molten salt storage tank 422 of second liquid accumulation of heat module 42 In temperature of molten salt it is constant, fused-salt medium by salt storage tank 421 enter low-temperature molten salt storage tank 422 to complete to exchange heat.Work When medium heat release, in the salt storage tank 421 and low-temperature molten salt storage tank 422 of second liquid accumulation of heat module 42 in fused salt Temperature-resistant, fused-salt medium enters salt storage tank 421 by low-temperature molten salt storage tank 422 to complete to exchange heat.In the present embodiment, The regenerator temperature range of the second liquid accumulation of heat module 42 is 275 to 494 DEG C, the accumulation of heat of the second liquid accumulation of heat module 42 Medium includes fused salt, which includes at least one of nitrate, sulfate, villaumite and villiaumite.In other embodiments, institute The heat storage medium for stating second liquid accumulation of heat module 42 can also be by water, aqueous solution, organic solution, conduction oil, fused salt and metal At least one composition.

In addition, the second liquid accumulation of heat module 42 can also include at least two interconnected and internal heat storage medium temperature Second liquid-the gas converting heat spending different heat storage medium cool-bags and being connected between the heat storage medium cool-bag Device, or heat storage medium cool-bag and connection including at least one interconnected and internal heat storage medium with temperature gradient Second liquid-gas heat exchanger between the different temperature difference regions of the heat storage medium cool-bag, with for enter the The working media of two hold over systems 4 exchanges heat.

It is illustrated in figure 4 the first phase transformation heat-storage module 31 of the first hold over system 3 and the knot of the second phase transformation heat-storage module 32 Structure schematic diagram.First phase transformation heat-storage module 31 and the second phase transformation heat-storage module 32 respectively include a lagging casing 321, lagging casing In 321 inner cavity be equipped with it is multiple by the inner cavity be spaced apart fins 322, thus define multiple trends along working media according to Secondary arrangement and with the heat-insulated cavity of working media heat exchange 323, comprising there are many heat-storing spheres or a variety of in each heat-insulated cavity 323 Solid sensible heat heat-storing material to match different temperatures of first hold over system 3 from import to outlet, while stablizing entrance temperature Degree.Multiple heat-insulated cavities 323 make the temperature change of heat storage medium therein be even variation, and fin 322 is used to help conduct heat With heat exchange so that heat exchange is complete.Wherein, solid sensible heat heat-storing material be metal, metal oxide, salt or gitter brick, for example, Aluminium, aluminium oxide, aluminum sulfate, magnesia gitter brick, cast iron, the pig iron, calcium chloride, copper, potassium chloride, potassium sulfate, sodium carbonate, granite, Lime stone, marble, sandstone etc..

As shown in figure 5, heat-storing sphere 324 is ball or near-spherical capsule body comprising involucrum 3241 and be filled in the involucrum The phase-change heat accumulation medium 3242 of 3241 inside.Involucrum 3241 can be alloy, graphite, high molecular material or composite material, example Such as nickel-base alloy, graphite, superhigh temperature resistant carborane radical silicon rubber, extruding vermiculite.Phase-change heat accumulation medium 3242 can be fused salt Simple substance, molten salt mixture (such as sodium chloride-sodium sulphate) or alloy, the phase-change heat accumulation medium that different types of heat-storing sphere inside is filled Phase transition temperature it is different, phase-change heat accumulation medium is liquid when temperature is lower than its phase transition temperature, is higher than its phase transition temperature in temperature When be solid, thus utilize its solid-state and thermal capacitance and latent heat of phase change accumulation of heat under liquid.

In the present embodiment, the regenerator temperature range of the first phase transformation heat-storage module 31 is 650 DEG C to 1000 DEG C, heat-storing sphere Phase-change heat accumulation medium be phase transition temperature in 650 DEG C to 1000 DEG C not equal fused salts, which is mainly various villaumites, fluoride salt (i.e. fused salt simple substance) or their fused salt mixt (i.e. molten salt mixture).The regenerator temperature range of second phase transformation heat-storage module 32 is 250 DEG C to 650 DEG C, the phase-change heat accumulation medium of heat-storing sphere is the fused salt that phase transition temperature is not waited at 250 DEG C to 650 DEG C, the fused salt (i.e. fused salt mixes for predominantly various villaumites, nitrate, nitrite, sulfate (i.e. fused salt simple substance) or their fused salt mixt Object).

Each primary parameters of test apparatus includes: that working media uses helium (adiabatic coefficent 1.66), the insulation of energy storage compressor 11 Efficiency is 0.90, and the adiabatic efficiency of energy storage turbine 21 is 0.95；The adiabatic efficiency of power generation compressor 12 is 0.90, power turbine 22 Adiabatic efficiency be 0.95；In the first liquid heat storage module 41, the thermally conductive oil temperature in high-temperature heat-conductive oil tank 411 is 275 DEG C, the thermally conductive oil temperature in the thermally conductive oil tank 412 of low temperature is 20 DEG C, and the heat transfer temperature difference of the first fluid-gas heat exchanger 413 is 15 DEG C, the working media flow resistance in the first fluid-gas heat exchanger 413 is 5kPa；In second liquid accumulation of heat module 42, high temperature Temperature of molten salt in fused salt storage tank 421 is 494 DEG C, and the temperature of molten salt in low-temperature molten salt storage tank 422 is 275 DEG C, second liquid-gas The heat transfer temperature difference of body heat exchanger 423 is 15 DEG C, and the working media flow resistance in second liquid-gas heat exchanger 423 is 10kPa；In the first phase transformation heat-storage module 31,1000 DEG C of the phase transition temperature of the highest phase-change heat accumulation medium of temperature, temperature is minimum 650 DEG C of phase transition temperature of phase-change heat accumulation medium, the heat transfer temperature difference of phase-change heat accumulation medium and working media is 15 DEG C, working media Flow resistance is 10kPa；In the second phase transformation heat-storage module 32,650 DEG C of the phase transition temperature of the highest phase-change heat accumulation medium of temperature, 252 DEG C of the phase transition temperature of the minimum phase-change heat accumulation medium of temperature, phase-change heat accumulation medium and working media heat transfer temperature difference are 15 DEG C, work Making media flow resistance is 10kPa.

There are two types of the operational modes of back-heating type alternating energy-storing and power-generating system of the invention, respectively power generation mode and energy storage mould Formula.Therefore, replace energy-storing and power-generating system using back-heating type described above, the back-heating type alternating energy storing and electricity generating method packet realized Include power generation mode and energy storage mode.

In generate mode, working media is compressed by power generation compressor 12, by 6 heat release of Intermediate Heat Exchanger, by the The heat absorption of one hold over system 3 (passing sequentially through the second phase transformation heat-storage module 32 and the first phase transformation heat-storage module 31), enters power generation later Turbine 22 expands, and absorbs heat by Intermediate Heat Exchanger 6, then (passes sequentially through second liquid accumulation of heat module 42 by the second hold over system 4 With the first liquid heat storage module 41) heat release, it radiates finally by radiator 5, subsequently back into compressor and repeats the above process.In Under power generation mode, fused salt thermal energy is returned in conduction oil accumulation of heat module by turbine, turbine rotation power generation, remaining energy, herein The function exported only in the process is for generating electricity.

Wherein, gas flow * thermal capacitance are as follows:

P_inFor the input power (unit: kW) of power generation mode, q_inFor gas flow * thermal capacitance (unit: kW/K), T_TRIt is saturating Flat inlet temperature (unit: K), T_TCFor turbine outlet temperature (unit: K), T_YRFor compressor inlet temperature (unit: K), T_YCFor Compressor exit temperature (unit: K).

W_FD=q_ing(T_TR-T_TC)

W_FDFor the generated energy of power generation mode, q_inFor gas flow * thermal capacitance (unit: kW/K), T_TRFor turbine inlet temperature (unit: K), T_TCFor turbine outlet temperature (unit: K).

Under power generation mode, it is 20 DEG C that working media temperature, pressure, which are respectively as follows: the inlet temperature of power generation compressor 12, everywhere, 300kPa；The outlet temperature of power generation compressor 12 is 539 DEG C, 3296kPa；The inlet temperature of second phase transformation heat-storage module 32 is 237 DEG C, inlet pressure 3286kPa；The outlet temperature of second phase transformation heat-storage module 32 is 635 DEG C, and back pressure is 3276kPa；The outlet temperature of first phase transformation heat-storage module 31 is 985, back pressure 3266kPa；The outlet of power turbine 22 Temperature is 267 DEG C, back pressure 325kPa；The inlet temperature of second liquid accumulation of heat module 42 is 509 DEG C, and inlet pressure is 315kPa；The outlet temperature of second liquid accumulation of heat module 42 is 290 DEG C, back pressure 305kPa, through radiator heat-dissipation, heat dissipation Device exports the entrance that P1 is power generation compressor 12.

Under energy storage mode, working media first passes through the second hold over system 4 and (passes sequentially through the first liquid heat storage module 41 and Two liquid heat storage modules 42) heat absorption, by 6 heat release of Intermediate Heat Exchanger, by the compression of energy storage compressor 11, using the first accumulation of heat System 3 (passing sequentially through phase transformation heat-storage module 31 and phase transformation heat-storage module 32) heat release, by Intermediate Heat Exchanger 6 absorb heat, it is laggard Enter the expansion of energy storage turbine 21, subsequently back into the second hold over system and repeats the above process.Under the energy storage mode, compressor 11 is right Working media acting, so that by the thermal energy storage of scene conversion in first liquid heat storage module 41 of the conduction oil as medium, Working media will be stored in the fused salt of conduction oil energy transfer to second liquid accumulation of heat module 41 with fused salt form of thermal energy.

When energy storage, working media temperature, pressure are respectively as follows: the entrance of second liquid accumulation of heat module 42, temperature 260 everywhere DEG C, pressure 320kPa；The outlet of second liquid accumulation of heat module 42,479 DEG C of temperature, pressure 310kPa；Compressor inlet temperature 237 DEG C, 300kPa；1015 DEG C of compressor exit temperature, 2631kPa；Phase transformation heat-storage module 31 exports, and 665 DEG C of temperature, pressure 2621kPa；Phase transformation heat-storage module 32 exports, and 267 DEG C of temperature, pressure 2611kPa；Turbine inlet temperature 509, pressure 2601kPa； Turbine outlet temperature 90, pressure 325kPa.Radiator outlet is 41 entrance of conduction oil module

According to the operating point temperature of thermal storage and energy accumulation electricity generation system, the first hold over system absorbs heat when available energy storage Input power 2MW when 4.1582MW is divided by energy storage is 207.91%, i.e. system stored energy efficiency.Energy storage efficiency is greater than 100%, is Because the first hold over system obtains heat at the second hold over system in energy storage.Output work when available power generation simultaneously Rate 1MW is 26.58%, i.e. system generating efficiency divided by the first hold over system heat release 3.7626MW.Generating efficiency is although lower, but It is most of to be absorbed by the first hold over system in heat extra at this time, the second hold over system will be reached in energy storage.

The generating efficiency 26.58% of backheat energy-storing and power-generating system is 55.26% multiplied by energy storage efficiency 207.91%, is as System gross efficiency.It can be seen that system reduces in two reversible each other process clock heat loss, transfer efficiency is improved.So that power generation effect Rate and energy storage efficiency are all improved, and follow a well mapped-out plan ground, and gross efficiency is also improved.

Since back-heating type alternating energy-storing and power-generating system equal mass-energy under power generation mode and energy storage mode of the invention separates, work Make medium transmitting energy, not sweep along energy to enter system in the external world, therefore does not need to swap with extraneous working media.

In back-heating type alternating energy storing and electricity generating method of the invention, working media includes air, argon gas, nitrogen, helium gas and water Steam or carbon dioxide, the operating pressure of working media are under subcritical, critical or supercriticality, therefore working media Operating pressure is in Near The Critical Point state.

The backheat energy-storing and power-generating system of the present embodiment, is replaced the principle of heat pump with back-heating type using phase-change thermal storage, provided A kind of efficient energy storage for power supply system, the heat loss that two kinds generate during reversible each other is collected into Intermediate Heat Exchanger, Backheating function, the i.e. complementation of heat release loss and heat absorption loss are realized, the use temperature of hot operation point is improved, improves pressure The operating condition of contracting machine, improves transfer efficiency.Backheat energy-storing and power-generating system of the invention is by will be in phase transformation heat-storage module Each heat-insulated cavity is set as comprising there are many heat-storing sphere or many kinds of solids sensible heat heat-storing material, with match the first hold over system from Import stablizes entrance temperature, while can also improve regenerative capacity to the different temperatures exported.The back-heating type replaces energy storage Electricity generation system high-temperature heat accumulation structure is simple, high reliablity, and circulation gross efficiency is high.To solve in photovoltaic power generation and wind power generation The peak load shifting problem for abandoning light, wind problem and peak-trough electricity provides thinking.

Above-described, only presently preferred embodiments of the present invention, the range being not intended to limit the invention, of the invention is upper Stating embodiment can also make a variety of changes.Made by i.e. all claims applied according to the present invention and description Simply, equivalent changes and modifications fall within the claims of the invention patent.The not detailed description of the present invention is Routine techniques content.