Circulating system based on metal fuel magnesium energy storage

Abstract

The utility model discloses a circulating system based on metal fuel magnesium energy storage. An energy storage subsystem comprises a heliostat, a high-temperature reduction reactor and a magnesium fuel conveying device. The heliostat is used for focusing projected sunlight radiation and projecting the focused sunlight radiation to the high-temperature reduction reactor, two material inlets of the high-temperature reduction reactor are connected with a carbon and magnesium oxide material supply respectively, and a material outlet of the high-temperature reduction reactor is connected with the magnesium fuel conveying device; the energy release subsystem comprises a magnesium powder cyclone burner, a main hearth, a dust remover, an induced draft fan, a steam turbine high-pressure cylinder, a steam turbine low-pressure cylinder, a generator, a condenser, a water feeding pump, an air feeder and a heat regeneration system heater. The device effectively couples metal magnesium fuel energy storage, magnesium air combustion power generation, light condensation and heat collection, metal magnesium carbon thermal reduction and the like, and has the advantages of being high in energy storage density, long in energy storage period, capable of achieving permanent storage and fuel cyclic regeneration, convenient to develop global energy trade and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of green power generation and advanced energy storage, and in particular relates to a circulation system based on metal fuel magnesium energy storage. Background Art

[0002] As global air pollution and climate warming become increasingly severe, traditional power generation systems based on fossil energy will face unprecedented pressure and challenges. From a global perspective, countries are working hard to increase the proportion of renewable energy generation in their power structure. In the future, the development trend of the world's energy sector will inevitably be the gradual replacement of fossil energy by renewable energy. However, due to its own intermittent, unstable and uncertain characteristics, renewable energy has seriously hindered the development of renewable energy power generation. In the future, to achieve the replacement of fossil energy by renewable energy, it is necessary to rely on the development and support of large-scale and long-cycle energy storage technology.

[0003] At present, research in the field of energy storage technology is very active, and various energy storage technologies are developing rapidly, such as pumped storage, compressed air storage, lithium battery storage, supercapacitor storage, flywheel storage, hydrogen storage, etc. However, existing energy storage technologies are difficult to simultaneously meet the requirements of high energy storage density, mobility, low self-consumption loss and global energy trade. Therefore, it is necessary to develop a new energy storage technology to enable renewable energy generation to develop in a deeper and wider direction worldwide. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a circulation system based on metal fuel magnesium energy storage, which effectively couples metal magnesium fuel energy storage, magnesium air combustion power generation, concentrated solar heat collection, metal magnesium carbon thermal reduction, etc., and has the advantages of high energy storage density, long energy storage cycle, permanent storage, fuel cycle regeneration and facilitation of global energy trade.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A circulation system based on metal fuel magnesium energy storage, comprising an energy storage subsystem and an energy release subsystem;

[0007] The energy storage subsystem includes a heliostat, a high-temperature reduction reactor and a magnesium fuel transportation device; the heliostat is used to focus the projected solar radiation and then project it onto the high-temperature reduction reactor, the two material inlets of the high-temperature reduction reactor are respectively connected to the carbon and magnesium oxide material supplies, and the material outlet of the high-temperature reduction reactor is connected to the magnesium fuel transportation device;

[0008] The energy release subsystem includes a magnesium powder cyclone burner, a main furnace, a dust collector, an induced draft fan, a turbine high-pressure cylinder, a turbine low-pressure cylinder, a generator, a condenser, a feedwater pump, a blower and a heat recovery system heater; the inner wall of the magnesium powder cyclone burner is paved with a burner refractory lining, and a burner cooling heating surface is arranged at the bottom of the burner refractory lining; the main furnace includes a main steam heating surface, a reheat steam heating surface, an economizer and an air preheater arranged in sequence from the inside to the outside;

[0009] The outlet steam of the high-pressure cylinder of the steam turbine is divided into two paths, one of which is connected to the extraction circuit, and the other is connected to the inlet of the reheat steam heating surface. The outlet of the reheat steam heating surface is connected to the inlet of the low-pressure cylinder of the steam turbine. The steam outlet of the low-pressure cylinder of the steam turbine is connected to the inlet of the condenser. The condensate outlet of the condenser is mixed with the make-up water outlet from the make-up water circuit and then connected to the inlet of the feed water pump. The outlet of the feed water pump is connected to the cold side inlet of the regenerative system heater. The cold side outlet of the regenerative system heater is connected to the inlet of the economizer. The outlet of the economizer is connected to the working medium inlet of the burner cooling heating surface. The working medium outlet of the burner cooling heating surface is connected to the inlet of the main steam heating surface. The steam outlet of the main steam heating surface is connected to the inlet of the high-pressure cylinder of the steam turbine. The high-temperature and high-pressure steam expands in the high-pressure cylinder of the steam turbine to do work. The high-pressure cylinder of the steam turbine, the low-pressure cylinder of the steam turbine and the generator are coaxially arranged.

[0010] The inlet of the blower is connected to the ambient air, the outlet of the blower is connected to the inlet of the air preheater, the outlet of the air preheater is connected to the inlet of the fuel delivery pipeline of the magnesium powder cyclone burner; the outlet of the main furnace is connected to the flue gas inlet of the dust collector, and the flue gas outlet of the dust collector is connected to the inlet of the induced draft fan.

[0011] A further improvement of the utility model is that in the high-temperature reduction reactor, magnesium oxide and carbon can undergo a reduction reaction under high-temperature conditions to generate magnesium powder fuel.

[0012] A further improvement of the utility model is that the magnesium powder fuel produced by the energy storage subsystem is transported by a magnesium fuel transportation device to an energy release subsystem located at a location where renewable energy generation is insufficient or the electricity load is large, and external power generation is achieved by the energy release subsystem.

[0013] A further improvement of the utility model is that the energy release subsystem further comprises a magnesium powder fuel storage tank for storing the magnesium powder fuel from the energy storage subsystem.

[0014] A further improvement of the utility model is that the energy release subsystem also includes a combustion product collecting device. In the magnesium powder cyclone burner, most of the solid product magnesium oxide produced by the combustion of magnesium powder is discharged into the combustion product collecting device through the solid material outlet at the bottom of the magnesium powder cyclone burner for collection, and the remaining small amount of a mixture of fine solid combustion products and high-temperature flue gas is connected to the flue gas inlet of the main furnace through the gas outlet at the top of the magnesium powder cyclone burner.

[0015] A further improvement of the utility model is that the energy release subsystem also includes a solid fine particle collection device, and the fine solid particles in the flue gas in the dust collector are separated and then enter the solid fine particle collection device for collection.

[0016] A further improvement of the utility model is that the energy release subsystem also includes a chimney, and the outlet of the induced draft fan is connected to the inlet of the chimney.

[0017] A further improvement of the utility model is that the reheat steam heating surface is used to absorb the heat of the high-temperature flue gas and then enters the low-pressure cylinder of the steam turbine to perform work.

[0018] A further improvement of the utility model is that the water working medium is used to absorb the heat of the high-temperature flue gas in the main steam heating surface to become high-temperature and high-pressure steam.

[0019] A further improvement of the utility model is that in the main furnace, the high-temperature flue gas flows through the main steam heating surface, the reheat steam heating surface, the economizer and the air preheater in sequence, and is connected to the flue gas inlet of the dust collector.

[0020] The utility model has at least the following beneficial technical effects:

[0021] The utility model discloses a circulation system based on metal fuel magnesium energy storage, which has the following advantages:

[0022] (1) Metal fuel magnesium has a high energy density; (2) Magnesium fuel does not contain carbon and does not produce carbon dioxide during combustion, making it a green and low-carbon power generation technology; (3) Renewable energy is converted into chemical energy of metal fuel magnesium for storage, which has the advantages of a long energy storage period and can achieve permanent storage; (4) After the magnesium-air combustion reaction, the solid combustion products are collected and reduced to obtain metal fuel magnesium. The fuel magnesium is recycled and regenerated without consumption during the entire process; (5) Energy storage through metal fuel magnesium facilitates global energy trade. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the energy storage subsystem of the utility model.

[0024] Figure 2 It is a structural schematic diagram of the energy release subsystem of the utility model.

[0025] Description of reference numerals:

[0026] 1 is solar radiation, 2 is heliostat, 3 is high-temperature reduction reactor, 4 is magnesium fuel transportation device, 5 is magnesium powder fuel storage tank, 6 is magnesium powder cyclone burner, 7 is burner refractory lining, 8 is burner cooling heating surface, 9 is main furnace, 10 is combustion product collection device, 11 is dust collector, 12 is solid fine particle collection device, 13 is induced draft fan, 14 is chimney, 15 is turbine high-pressure cylinder, 16 is turbine low-pressure cylinder, 17 is generator, 18 is condenser, 19 is feed water pump, 20 is blower, 21 is heat recovery system heater; 91 is main steam heating surface, 92 is reheat steam heating surface, 93 is economizer, 94 is air preheater. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below with reference to the accompanying drawings:

[0028] The utility model provides a circulation system based on metal fuel magnesium energy storage, which comprises an energy storage subsystem and an energy release subsystem.

[0029] refer to Figure 1 The energy storage subsystem includes a heliostat 2, a high-temperature reduction reactor 3 and a magnesium fuel transportation device 4; the heliostat 2 focuses the projected solar radiation 1 and projects it onto the high-temperature reduction reactor 3 to provide the high-temperature reduction reactor 3 with the heat required for heating. The two material inlets of the high-temperature reduction reactor 3 are respectively connected to the carbon and magnesium oxide material supplies. In the high-temperature reduction reactor 3, magnesium oxide and carbon undergo a reduction reaction under high temperature conditions, and the reaction equations are MgO+C=Mg+CO and Mg+CO=Mg+CO2. The metal fuel magnesium produced by the reaction is connected to the magnesium fuel transportation device 4 through the material outlet of the high-temperature reduction reactor 3. The magnesium powder fuel produced by the energy storage subsystem is transported to the energy release subsystem located at a location where renewable energy generation is insufficient or the electricity load is large through the magnesium fuel transportation device 4, and external power generation is achieved through the energy release subsystem.

[0030] refer to Figure 2 The energy release subsystem includes a magnesium powder fuel storage tank 5, a magnesium powder cyclone burner 6, a combustion product collection device 10, a main furnace 9, a dust collector 11, a solid fine particle collection device 12, an induced draft fan 13, a chimney 14, a turbine high-pressure cylinder 15, a turbine low-pressure cylinder 16, a generator 17, a condenser 18, a feed water pump 19, a blower 20 and a heat recovery system heater 21; the inner wall of the magnesium powder cyclone burner 6 is paved with a burner refractory lining 7, and a burner cooling heating surface 8 is arranged at the bottom of the burner refractory lining 7; the main furnace 9 includes a main steam heating surface 91, a reheat steam heating surface 92, an economizer 93 and an air preheater 94 arranged in sequence from the inside to the outside.

[0031] The outlet steam of the steam turbine high pressure cylinder 15 is divided into two paths, one of which is connected to the extraction circuit and is used for heating feed water in the heat recovery system or for other purposes, and the other is connected to the inlet of the reheat steam heating surface 92. After absorbing the heat of the high-temperature flue gas in the reheat steam heating surface 92, the steam enters the low pressure cylinder 16 of the steam turbine to perform work. The steam outlet of the low pressure cylinder 16 of the steam turbine is connected to the inlet of the condenser 18. In the condenser 18, the steam is condensed into liquid water and mixed with the make-up water from the make-up water circuit and connected to the inlet of the feed water pump 19. After being pressurized by the feed water pump 19, it is connected to the cold side inlet of the heat recovery system heater 21. The heat recovery system heater 2 The cold side outlet of 1 is connected with the inlet of economizer 93, the outlet of economizer 93 is connected with the working medium inlet of burner cooling heating surface 8, the working medium outlet of burner cooling heating surface 8 is connected with the inlet of main steam heating surface 91, the water working medium absorbs the heat of high-temperature flue gas in the main steam heating surface 91 to become high-temperature and high-pressure steam, the steam outlet of main steam heating surface 91 is connected with the inlet of steam turbine high-pressure cylinder 15, the high-temperature and high-pressure steam expands in the steam turbine high-pressure cylinder 15 to do work, the steam turbine high-pressure cylinder 15, the steam turbine low-pressure cylinder 16 and the generator 17 are coaxially arranged, and the rotation of the steam turbine drives the generator 17 to rotate to transmit electricity outward.

[0032] The inlet of the blower 20 is connected to the ambient air, the outlet of the blower 20 is connected to the inlet of the air preheater 94, the outlet of the air preheater 94 is connected to the inlet of the fuel delivery pipeline of the magnesium powder cyclone burner 6, and the fuel delivery pipeline is connected to a magnesium fuel storage tank 5. The magnesium powder-air mixture transported by high-temperature air enters the magnesium powder cyclone burner 6 to undergo a combustion reaction, and the reaction equation is 2Mg+O2=2MgO. In the magnesium powder cyclone burner 6, most of the solid product magnesium oxide produced by the combustion of magnesium powder is discharged into the combustion product collecting device 10 through the solid material outlet at the bottom of the magnesium powder cyclone burner 6 for collection, and the remaining small amount of fine solid combustion product and high-temperature flue gas mixture is connected to the flue gas inlet of the main furnace 9 through the gas outlet at the top of the magnesium powder cyclone burner 6. The high-temperature flue gas flows through the main steam heating surface 91, the reheated steam heating surface 92, the economizer 93 and the air preheater 94 in the main furnace 9 in sequence and is connected to the flue gas inlet of the dust collector 11. The fine solid particles in the flue gas in the dust collector 11 are separated and then enter the solid fine particle collecting device 12 for collection. The flue gas outlet of the dust collector 11 is connected to the inlet of the induced draft fan 13, and the outlet of the induced draft fan 13 is connected to the inlet of the chimney 14.

[0033] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A circulation system based on metal fuel magnesium energy storage, characterized in that: It includes energy storage subsystem and energy release subsystem; The energy storage subsystem comprises a heliostat (2), a high-temperature reduction reactor (3) and a magnesium fuel transportation device (4); the heliostat (2) is used to focus the projected solar radiation (1) and then project it onto the high-temperature reduction reactor (3); two material inlets of the high-temperature reduction reactor (3) are respectively connected to carbon and magnesium oxide material supplies; and the material outlet of the high-temperature reduction reactor (3) is connected to the magnesium fuel transportation device (4); The energy release subsystem comprises a magnesium powder cyclone burner (6), a main furnace (9), a dust collector (11), an induced draft fan (13), a turbine high-pressure cylinder (15), a turbine low-pressure cylinder (16), a generator (17), a condenser (18), a feed water pump (19), a blower (20) and a heat recovery system heater (21); the inner wall of the magnesium powder cyclone burner (6) is paved with a burner refractory lining (7), and a burner cooling heating surface (8) is arranged at the bottom of the burner refractory lining (7); the main furnace (9) comprises a main steam heating surface (91), a reheat steam heating surface (92), an economizer (93) and an air preheater (94) which are arranged in sequence from the inside to the outside; The outlet steam of the high-pressure cylinder (15) of the steam turbine is divided into two paths, one of which is connected to the extraction circuit, and the other is connected to the inlet of the reheat steam heating surface (92). The outlet of the reheat steam heating surface (92) is connected to the inlet of the low-pressure cylinder (16) of the steam turbine. The steam outlet of the low-pressure cylinder (16) of the steam turbine is connected to the inlet of the condenser (18). The condensate outlet of the condenser (18) is mixed with the make-up water outlet from the make-up water circuit and then connected to the inlet of the feed water pump (19). The outlet of the feed water pump (19) is connected to the cold side inlet of the regenerative system heater (21). The cold side outlet of the heat recovery system heater (21) is connected to the inlet of the economizer (93), the outlet of the economizer (93) is connected to the working medium inlet of the burner cooling heating surface (8), the working medium outlet of the burner cooling heating surface (8) is connected to the inlet of the main steam heating surface (91), the steam outlet of the main steam heating surface (91) is connected to the inlet of the turbine high-pressure cylinder (15), the high-temperature and high-pressure steam expands in the turbine high-pressure cylinder (15) to do work, and the turbine high-pressure cylinder (15), the turbine low-pressure cylinder (16) and the generator (17) are coaxially arranged; The inlet of the blower (20) is connected to the ambient air, the outlet of the blower (20) is connected to the inlet of the air preheater (94), and the outlet of the air preheater (94) is connected to the inlet of the fuel delivery pipeline of the magnesium powder cyclone burner (6); the outlet of the main furnace (9) is connected to the smoke inlet of the dust collector (11), and the smoke outlet of the dust collector (11) is connected to the inlet of the induced draft fan (13).

2. A circulation system based on metal fuel magnesium energy storage according to claim 1, characterized in that: In the high-temperature reduction reactor (3), magnesium oxide and carbon can undergo a reduction reaction under high-temperature conditions to generate magnesium powder fuel.

3. A circulation system based on metal fuel magnesium energy storage according to claim 2, characterized in that: The magnesium powder fuel produced by the energy storage subsystem is transported by a magnesium fuel transport device (4) to an energy release subsystem located at a location where renewable energy generation is insufficient or where the electricity load is large, and external power generation is achieved by the energy release subsystem.

4. A circulation system based on metal fuel magnesium energy storage according to claim 2, characterized in that: The energy release subsystem also includes a magnesium powder fuel storage tank (5) for storing the magnesium powder fuel from the energy storage subsystem.

5. A circulation system based on metal fuel magnesium energy storage according to claim 2, characterized in that: The energy release subsystem also includes a combustion product collection device (10). In the magnesium powder cyclone burner (6), most of the solid product magnesium oxide produced by the combustion of magnesium powder is discharged into the combustion product collection device (10) through the solid material outlet at the bottom of the magnesium powder cyclone burner (6) for collection, and the remaining small amount of a mixture of fine solid combustion products and high-temperature flue gas is connected to the flue gas inlet of the main furnace (9) through the gas outlet at the top of the magnesium powder cyclone burner (6).

6. A circulation system based on metal fuel magnesium energy storage according to claim 1, characterized in that: The energy release subsystem also includes a solid fine particle collection device (12). After the fine solid particles in the flue gas in the dust collector (11) are separated, they enter the solid fine particle collection device (12) for collection.

7. A circulation system based on metal fuel magnesium energy storage according to claim 1, characterized in that: The energy release subsystem further comprises a chimney (14), and the outlet of the induced draft fan (13) is connected to the inlet of the chimney (14).

8. A circulation system based on metal fuel magnesium energy storage according to claim 1, characterized in that: The reheat steam heating surface (92) is used to absorb the heat of the high-temperature flue gas and then enter the low-pressure cylinder (16) of the steam turbine to perform work.

9. A circulation system based on metal fuel magnesium energy storage according to claim 1, characterized in that: The water working medium is used to absorb the heat of the high-temperature flue gas in the main steam heating surface (91) and becomes high-temperature and high-pressure steam.

10. A circulation system based on metal fuel magnesium energy storage according to claim 1, characterized in that: In the main furnace (9), the high-temperature flue gas flows through the main steam heating surface (91), the reheat steam heating surface (92), the economizer (93) and the air preheater (94) in sequence, and is then connected to the flue gas inlet of the dust collector (11).

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