High-temperature heat storage method and system for coupling peak regulation boiler

Abstract

The invention provides a high-temperature heat storage method and system of a coupling peak regulation boiler. The method comprises the steps that hot flue gas of the peak shaving boiler and a low-temperature solid particle heat storage material are mixed and subjected to heat exchange, and a high-temperature solid particle heat storage material is obtained; the high-temperature solid particle heat storage material is stored in a heat preservation mode; the high-temperature solid particle heat storage material exchanges heat with water or water vapor to generate high-temperature steam, and at least part of the high-temperature steam is used for power generation; carrying out mixed heat exchange on the high-temperature solid particle heat storage material and gas to obtain high-temperature flue gas; and at least part of the high-temperature flue gas is sent back into the peak regulation boiler. The technical scheme can be widely applied to the technical field of boiler peak regulation.

Description

Technical Field

[0001] The present invention belongs to the technical field of boiler peak regulation, and in particular relates to a technology of a high-temperature heat storage coupled boiler for peak regulation. Background Art

[0002] With the dual carbon goals, new energy generation technologies, represented by wind and photovoltaic power generation, have flourished. However, wind and photovoltaic power generation are subject to significant volatility and intermittency, which, when integrated into the power grid, has adversely affected the safe and stable operation of the grid.

[0003] To address the aforementioned adverse effects of renewable energy generation, grid-connected thermal power units are being introduced to complement renewable energy generation. This means that during periods of low renewable energy generation, thermal power units are operated at high load to offset electricity demand; during peak renewable energy generation periods, thermal power units are operated at low load to reduce the impact on grid capacity.

[0004] However, on the one hand, the boilers of thermal power units have strong thermal inertia, which leads to slow load adjustment and reduction, making it difficult to respond to electricity demand in a timely manner, and a large amount of heat energy is wasted during the frequent load adjustment and reduction process; on the other hand, the boilers of thermal power units are prone to unstable combustion during deep peak regulation (that is, the thermal power units are in a low-load power generation state), further worsening the response speed of the thermal power units to electricity demand. Summary of the Invention

[0005] In order to solve the problem of the aforementioned thermal power units not being able to meet electricity demand and energy waste, the present invention provides a high-temperature heat storage method and system coupled with a peak-shaving boiler. The technical solution of the present invention is as follows:

[0006] A high-temperature heat storage method for a coupled peak-shaving boiler comprises the following steps:

[0007] S1. Mixing the hot flue gas of the peak-shaving boiler with a low-temperature solid particle heat storage material for heat exchange to obtain a high-temperature solid particle heat storage material;

[0008] S2, storing the high-temperature solid particle heat storage material in a heat-insulating manner;

[0009] S3, exchanging heat between the high-temperature solid particle heat storage material and water or steam to generate high-temperature steam, and using at least part of the high-temperature steam for power generation;

[0010] S4. Mix the high-temperature solid particle heat storage material with gas for heat exchange to obtain high-temperature flue gas; at least part of the high-temperature flue gas is returned to the peak-shaving boiler.

[0011] Optionally, step S1 is performed during the load reduction stage of the peak-shaving boiler; step S3 is performed during the load increase stage of the peak-shaving boiler; and step S4 is performed during the load increase stage of the peak-shaving boiler.

[0012] Optionally, step S4 is performed during the deep peak-shaving stage of the peak-shaving boiler.

[0013] Optionally, the low-temperature solid particle heat storage material and the high-temperature solid particle heat storage material are made of Al2O3 and / or SiO2.

[0014] The system for performing the high-temperature heat storage method coupled to the peak-shaving boiler as described above comprises a cyclone separator group, a high-temperature silo, a first heat exchange bed, and a low-temperature silo; the high-temperature silo is used to store the high-temperature solid particle heat storage material; the low-temperature silo is used to store the low-temperature solid particle heat storage material;

[0015] The cyclone separator group is provided with a separator group feed port, a separator group air inlet and a separator group discharge port; the separator group air inlet is connected to the smoke exhaust port of the peak-shaving boiler; the separator group feed port is connected to the low-temperature silo; the separator group discharge port is connected to the high-temperature silo;

[0016] The first heat exchange bed is provided with a hot material inlet, a cold material outlet, a low-temperature gas inlet, a high-temperature gas outlet, a low-temperature steam inlet and a high-temperature steam outlet; the hot material inlet is connected to the high-temperature material bin; the cold material outlet is connected to the low-temperature material bin; the high-temperature gas outlet is connected to the peak-shaving boiler.

[0017] Optionally, the high-temperature gas outlet is connected to the primary air inlet of the peak-shaving boiler.

[0018] Optionally, the first heat exchange bed includes a bubbling heat exchange bed; a steam heat exchanger is provided in the bubbling heat exchange bed; the low-temperature steam inlet and the high-temperature steam outlet are connected to the steam heat exchanger.

[0019] Optionally, a plurality of heat exchange zones are arranged in the bubbling heat exchange bed according to the temperature.

[0020] Optionally, the system also includes a second heat exchange bed; the second heat exchange bed includes a flue gas heat exchange bed and a gas-solid separator; the inlet of the flue gas heat exchange bed is connected to the high-temperature silo, and the exhaust port of the flue gas heat exchange bed is connected to the air inlet of the gas-solid separator; the outlet of the gas-solid separator is connected to the hot material inlet of the first heat exchange bed.

[0021] Optionally, a spiral baffle is provided on the inner wall of the final cyclone separator of the cyclone separator group; the spiral baffle is a spiral formed by a strip plate; the axis of the spiral coincides with the axis of the final cyclone separator.

[0022] The technical effects of the present invention are as follows:

[0023] The technical solution of this invention directly mixes and exchanges heat with the hot flue gas from the peak-shaving boiler with low-temperature solid granular thermal storage material, minimizing heat loss and achieving efficient energy storage. During the deep peak-shaving and load-increasing phases of the peak-shaving boiler, the energy stored in the solid granular thermal storage material is released through heat exchange with gas and steam. Energy is stored and reused during the peak-shaving boiler's load-increasing and load-increasing processes, improving energy efficiency.

[0024] The energy-absorbing gas is heated (high-temperature flue gas) and then transported to the peak-shaving boiler. During the deep peak-shaving phase of the peak-shaving boiler, the high-temperature flue gas enables the boiler to maintain stable combustion even at very low loads, eliminating the need for additional auxiliary fuel. During the peak-shaving boiler's load-raising phase, the high-temperature flue gas improves the boiler's response speed.

[0025] During the load increase stage of the peak-shaving boiler, the steam that absorbs energy can directly enter the turbine to drive the turbine to generate electricity. Therefore, there is no need to wait until the peak-shaving boiler reaches a high load state, thereby increasing the load increase rate of the thermal power unit and meeting the power grid's demand for rapid load changes.

[0026] In summary, the technical solution of the present invention achieves the purpose of the present invention.

[0027] Further effects of the above optional manner will be described below in conjunction with specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a flow chart of the high-temperature heat storage method for coupled peak-shaving boilers of the present invention.

[0029] Figure 2 This is a schematic diagram of an embodiment of a high-temperature heat storage system coupled to a peak-shaving boiler according to the present invention.

[0030] Figure 3 for Figure 2 The structural principle diagram of the final separator in the cyclone separator group in the embodiment shown is shown.

[0031] The symbols in the figure are explained as follows:

[0032] 1. Air preheater; 2. Economizer; 3. Furnace; 4. Platen superheater; 5. Separator No. 4; 6. Separator No. 2; 7. Separator No. 1; 8. Separator No. 3; 9. Separator No. 5; 10. Bucket elevator No. 2; 11. Low-temperature silo; 12. Bucket elevator No. 1; 13. Wind chamber; 14. Low-temperature bubbling zone; 15. Medium-temperature bubbling zone; 16. High-temperature bubbling zone; 17. Steam; 18. Bubbling heat exchanger bed; 19. High-temperature silo; 20. Flue gas heat exchanger bed; 21. Gas-solid separator; 22. Secondary air inlet; 23. High-temperature flue gas; 24. Separator exhaust port; 25. Separator inlet. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0034] like Figure 2 As shown, the system for implementing the high-temperature heat storage method of the coupled peak-shaving boiler of the present invention includes a cyclone separator group, a high-temperature silo 19, a bubbling heat exchange bed 18, a flue gas heat exchange bed 20, and a low-temperature silo 11. The cyclone separator group is a separator group composed of five cyclone separators (separator No. 1 7, separator No. 2 6, separator No. 3 8, separator No. 4 5, and separator No. 5 9) connected in series. The specific series connection of the five cyclone separators is as follows: the exhaust port of separator No. 5 9 and the discharge port of separator No. 3 8 are both connected to the inlet of separator No. 4 5; the discharge port of separator No. 4 5 is connected to the inlet of separator No. 5 9; the exhaust port of separator No. 4 5 and the discharge port of separator No. 2 6 are both connected to the inlet of separator No. 3 8; the exhaust port of separator No. 3 8 and the discharge port of separator No. 1 7 are connected to the inlet of separator No. 2 6; and the exhaust port of separator No. 2 6 is connected to the inlet of separator No. 1 7. Figure 2 The peak-shaving boiler is a 660MW ultra-supercritical pulverized coal furnace, and a screen superheater 4 is provided in the furnace 3 of the pulverized coal furnace. An economizer 2 and an air preheater 1 are provided in the tail flue of the pulverized coal furnace. The high-temperature flue gas 23 from the furnace 3 is introduced into the inlet of the No. 5 separator 9. The discharge port of the No. 5 separator 9 is connected to the high-temperature silo 19. The exhaust port of the No. 1 separator 7 is connected to the tail flue of the pulverized coal furnace, specifically the part between the economizer 2 and the air preheater 1 in the tail flue.

[0035] The two outlets of the high-temperature silo 19 are connected to the inlet of the flue gas heat exchange bed 20 and the hot material inlet of the bubbling heat exchange bed 18, respectively. The cold material outlet of the bubbling heat exchange bed 18 is connected to the inlet of the No. 1 bucket elevator 12. The outlet of the No. 1 bucket elevator 12 is connected to the inlet of the low-temperature silo 11. The outlet of the low-temperature silo 11 is connected to the inlet of the No. 2 bucket elevator 10. The outlet of the No. 2 bucket elevator 10 is connected to the inlet of the No. 1 separator 7.

[0036] like Figure 2 As shown, the bubbling heat exchange area within the bubbling heat exchange bed 18 is divided into a low-temperature bubbling zone 14, a medium-temperature bubbling zone 15, and a high-temperature bubbling zone 16 according to the temperature gradient. The low-temperature gas inlet of the bubbling heat exchange bed 18 is located in the wind chamber 13. The high-temperature gas outlet of the bubbling heat exchange bed 18 is connected to the primary air inlet of the furnace 3. A steam heat exchanger is also provided in the bubbling heat exchange area within the bubbling heat exchange bed 18 for heat exchange between steam 17 and the high-temperature solid particulate heat storage material. The steam heat exchanger is provided with a low-temperature steam inlet and a high-temperature steam outlet.

[0037] like Figure 2The flue gas heat exchange bed 20 is shown with a gas inlet. The exhaust port of the flue gas heat exchange bed 20 is connected to the air inlet of the gas-solid separator 21. The discharge port of the gas-solid separator 21 is connected to the bubbling heat exchange bed 18. The exhaust port of the gas-solid separator 21 is connected to the secondary air inlet 22 of the furnace 3.

[0038] Figure 3 Shows Figure 2 The structural principle of the final separator (i.e., the No. 1 separator 7) in the cyclone separator group in the embodiment shown. Figure 3 As shown, a spiral baffle is provided on the inner wall of the No. 1 separator 7. The No. 1 separator 7 comprises two parts, a straight section and a conical section, and the spiral baffle is provided on both the straight section and the conical section. The spiral baffle is a spiral formed by a strip plate, and the axis of the spiral coincides with the axis of the No. 1 separator 7. The specific setting parameters of the spiral are as follows: Figure 3 As shown: s is the spiral pitch, d is the width of the strip plate, h is the thickness of the strip plate, and D is the inner diameter of the straight section of the No. 1 separator 7. The parameter selection range of the spiral body is: s = 0.31D ~ 0.36D, d = 0.1D ~ 0.12D, h = 0.05D ~ 0.07D.

[0039] Figure 1 The main process of the method of the present invention is shown. Figure 2 Shown is a system for implementing the method of the present invention. Figure 2 The dashed lines with arrows in the figure represent the gas flow path and direction. Figure 1 right Figure 2 、 Figure 3 The working process of the illustrated embodiment is described to further illustrate the technical solution of the present invention.

[0040] The solid particle heat storage material used in the present invention is a high melting point material that does not change state during system operation. Examples of the material of the solid particle heat storage material include Al2O3 and / or SiO2, and the particle size of the solid particle heat storage material is 50 to 400 μm.

[0041] right Figure 2 、 Figure 3 The operating process of the illustrated embodiment is described according to the load reduction phase, deep peak shaving phase, and load increase phase of the pulverized coal boiler. The load reduction phase refers to the process of reducing the pulverized coal boiler's own power generation capacity; the deep peak shaving phase refers to the process of maintaining low power generation capacity; and the load increase phase refers to the process of increasing the pulverized coal boiler's own power generation capacity.

[0042] Load reduction phase

[0043] In the pulverized coal boiler load reduction stage, 350000Nm 3 / h, 1100 ℃ high temperature flue gas 23 is extracted from the furnace 3 at the bottom of the screen superheater 4 and introduced into the inlet of the No. 5 separator 9 to mix with the solid particle heat storage material from the discharge port of the No. 4 separator 5. The mixed flue gas-particle mixture is separated into gas and solid in the No. 5 separator 9. At the same time, the high temperature flue gas and the solid particle heat storage material exchange heat during the separation process. The high temperature solid particle heat storage material (about 800 ℃ -900 ℃) separated by the No. 5 separator 9 enters the high temperature silo 19 through the discharge port of the No. 5 separator 9. The high temperature silo 19 takes insulation measures to store the high temperature solid particle heat storage material. This process corresponds to the execution Figure 1 Step S2 (heat storage material storage): In step S2, the high-temperature solid particle heat storage material is stored in a heat-insulating manner.

[0044] After the flue gas-particle mixture undergoes gas-solid separation in the No. 5 separator 9, the separated flue gas is discharged through the exhaust port of the No. 5 separator 9, mixed with the solid particle heat storage material from the No. 3 separator 8 before the inlet of the No. 4 separator 5, and then enters the No. 4 separator 5 for separation. The solid particle heat storage material separated by the No. 4 separator 5 enters the No. 5 separator, and the gas separated by the No. 4 separator 5 enters the No. 3 separator 8. Similarly, the gases separated by the separators in the cyclone separator group (except the No. 1 separator 7 and the No. 5 separator 9) all enter the upper-stage separator, and the separated solid particle heat storage materials all enter the lower-stage separator. The flue gas temperature discharged from the No. 1 separator 7 is reduced to about 380°C and then returns to between the economizer 2 and the air preheater 1, which can increase the flue gas temperature at the low-load SCR inlet and improve the denitrification efficiency.

[0045] The feed inlet of the cyclone separator group (the inlet of separator No. 1 7) receives low-temperature solid granular heat storage material from the low-temperature silo 11 (the low-temperature solid granular heat storage material in the low-temperature silo 11 is transferred using the No. 2 bucket elevator 10). Under the action of gravity, the low-temperature solid granular heat storage material falls step by step from separator No. 1 7 to separator No. 5 9. The flue gas inlet of the cyclone separator group (the inlet of separator No. 5 9) receives high-temperature flue gas from the furnace 3. Under the direction of gravity, the high-temperature flue gas rises, continuously mixing, exchanging heat, and separating with the solid granular heat storage material in sequence, thereby continuously increasing the temperature of the initial low-temperature solid granular heat storage material, absorbing a large amount of heat energy from the flue gas, and lowering the flue gas temperature. Because the high-temperature flue gas is extracted from the furnace 3, the flue gas returning to the tail flue of the peak-shaving boiler has a lower temperature, which reduces the heat exchange of the peak-shaving boiler's heating surface. At this time, combined with the reduction of the water supply to the heating surface, the steam parameters entering the steam turbine of the peak-shaving boiler are reduced, accelerating the load reduction rate of the unit, thereby meeting the power grid's demand for rapid load changes. The above process of heat exchange between flue gas and solid particle heat storage material in the cyclone separator group corresponds to the execution of Figure 1In step S1 (heat storage material absorbs heat), the hot flue gas of the boiler is mixed with the low-temperature solid particle heat storage material for heat exchange to obtain the high-temperature solid particle heat storage material.

[0046] The flue gas discharged from the No. 1 separator 7 contains solid particles and has a high temperature. Such flue gas causes great loss to the subsequent fans. To solve this problem, this embodiment improves the separation efficiency of the No. 1 separator 7, reduces the solid particle content in the flue gas, and thus reduces the loss to the subsequent fans. The measures to improve the separation efficiency of the No. 1 separator 7 are as follows: Figure 3 The spiral baffle shown. After the low-temperature solid granular heat storage material enters separator No. 1 7, it spirals downward along the inner wall of separator No. 1 7 under the action of airflow. The spiral baffle forms a flow channel on the inner wall, slowing the spiral descent of the low-temperature solid granular heat storage material and increasing its separation time, thereby improving the separation efficiency and heat exchange efficiency of separator No. 1 7.

[0047] Deep peak-shaving stage

[0048] In the deep peak regulation stage, the peak regulation boiler can still perform at 20% load condition. Figure 1 Step S1. That is, high-temperature flue gas (about 1000°C) is extracted from the furnace 3 and enters the cyclone separator group. The flue gas discharged from the cyclone separator group is about 350°C and returns to the economizer 2 and the air preheater 1. The power generation load of the peak-shaving boiler can be further reduced to 15%. Under such low-load operation conditions, it becomes a problem for the peak-shaving boiler to maintain stable combustion. Part of the high-temperature solid particle heat storage material stored in the high-temperature silo 19 enters the flue gas heat exchange bed 20, and undergoes rapid fluidization and mixed heat exchange with the introduced air to produce a heated gas-solid mixture. The heated gas-solid mixture enters the gas-solid separator 21 for gas-solid separation, and the separated solid particle heat storage material enters the bubbling heat exchange bed 18; the separated heated flue gas enters the furnace through the secondary air inlet 22 of the pulverized coal furnace to maintain stable combustion in the furnace 3. The above-mentioned process of heat exchange in the flue gas heat exchange bed 20 and maintaining stable combustion in the furnace 3 corresponds to the execution Figure 1 In step S4 (generating high-temperature flue gas), the high-temperature solid particle heat storage material is mixed with the gas for heat exchange to obtain high-temperature flue gas; at least part of the high-temperature flue gas is returned to the peak-shaving boiler.

[0049] After the secondary air temperature rises: (1) Strengthen the oxygen supply in the late combustion stage: After the secondary air temperature rises, the heat it carries can be quickly supplemented to the late combustion stage (volatile matter burnout and coke combustion stage), accelerate the combustion reaction rate, and prevent combustion interruption due to insufficient temperature; (2) Enhance the uniformity of the furnace temperature field: The high-temperature secondary air is mixed with the flame through swirl or direct flow, which increases the overall temperature level of the furnace, reduces local low-temperature areas, and avoids combustion fluctuations and flame pulsations; (3) Optimize air staged combustion: In the staged combustion design, increasing the secondary air temperature can better coordinate the heat distribution between the main combustion zone and the burnout zone, extend the flame residence time, increase the burnout rate and stabilize the combustion process.

[0050] Load increase stage

[0051] During the load increase phase, high-temperature solid particle heat storage material enters the bubbling heat exchange bed 18 from the high-temperature silo 19. Within the bubbling heat exchange bed 18, the high-temperature solid particle heat storage material and air bubble and fluidize, undergoing mixed heat exchange to produce high-temperature flue gas. Furthermore, the high-temperature solid particle heat storage material exchanges heat with the steam heat exchanger. The temperatures within the high-temperature bubbling zone 14, the medium-temperature bubbling zone 15, and the low-temperature bubbling zone 16 are 500-700°C, 200-500°C, and 100-200°C, respectively. The solid particle heat storage material flows sequentially from the high-temperature to the low-temperature zones to achieve sufficient heat exchange. The working fluid entering the steam heat exchanger through the low-temperature steam inlet can come from boiler feed water or high-pressure cylinder exhaust steam. The water or low-temperature steam within the steam heat exchanger is heated to high-temperature steam. The high-temperature bubbling zone 14 can generate superheated steam at 605°C. This high-temperature steam can be directly fed into the steam turbine, rapidly starting the turbine for power generation and improving the speed of responding to load increases. The above process of heat exchange in the steam heat exchanger and then quickly driving the steam turbine to generate electricity corresponds to the execution of Figure 1 Step S3 (generating high-temperature steam) is to exchange heat between the high-temperature solid particle heat storage material and water or water vapor to generate high-temperature steam, and at least part of the high-temperature steam is used for power generation.

[0052] The high-temperature flue gas generated in the bubbling heat exchange bed 18 enters the furnace 3 through the primary air inlet of the pulverized coal furnace, increasing the temperature rise rate in the furnace 3 and accelerating the load increase process of the pulverized coal furnace. Figure 1 In step S4 (generating high-temperature flue gas), the high-temperature solid particle heat storage material is mixed with the gas for heat exchange to obtain high-temperature flue gas; at least part of the high-temperature flue gas is returned to the peak-shaving boiler.

[0053] The primary air entering the furnace 3 plays the following roles: (1) promoting pulverized coal ignition: increasing the primary air temperature can shorten the preheating time of pulverized coal, quickly reach the ignition temperature, and reduce ignition delay. Especially for high-moisture or low-volatile coal, it can significantly improve the ignition stability and avoid flame flickering or extinction; (2) stabilizing the initial combustion zone: after the high-temperature primary air carries the pulverized coal into the furnace, it can provide more initial heat for the pulverized coal, reduce the temperature fluctuation in the burner outlet area, and form a more stable initial combustion core; (3) improving the uniformity of pulverized coal transportation: appropriate temperature increase can reduce the viscosity of the primary air, enhance the mixing uniformity of pulverized coal and air, reduce the risk of local fuel concentration being too high or too low, and thus stabilize combustion.

[0054] The flue gas heat exchange bed 20 and gas-solid separator 21 simultaneously generate elevated flue gas, which enters the furnace 3 through the secondary air inlet 22, further increasing the load ramp rate. After sufficient heat exchange, the solid particulate heat storage material is transported from the bubbling heat exchange bed 18 to the low-temperature silo 11 via the No. 1 bucket elevator 12. To maximize thermal energy utilization and ensure the heat resistance of the No. 1 bucket elevator 12, water is used as the working fluid in the steam heat exchanger within the low-temperature bubbling zone 16.

[0055] In the bubbling heat exchange bed 18, the flow velocity in the high-temperature bubbling zone 16 is lower than the flow velocity in the low-temperature bubbling zone 14. The flow velocity of the solid granular heat storage material gradually increases as it passes from the high-temperature bubbling zone 16 to the heavy object bubbling zone 15 and then to the low-temperature bubbling zone 14. To form an isotropic air distribution structure, the cross-sectional area of the bubbling zone gradually decreases from the high-temperature bubbling zone 16 to the low-temperature bubbling zone 14.

[0056] It is worth noting that the above description is merely a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. The present invention may also be replaced by equivalent technologies. Therefore, any equivalent changes made by applying the description and illustrations of the present invention, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A high-temperature heat storage method coupled with a peak-shaving boiler, characterized by: The steps include: S1. Mixing the hot flue gas of the peak-shaving boiler with a low-temperature solid particle heat storage material for heat exchange to obtain a high-temperature solid particle heat storage material; S2, storing the high-temperature solid particle heat storage material in a heat-insulating manner; S3, exchanging heat between the high-temperature solid particle heat storage material and water or steam to generate high-temperature steam, and using at least part of the high-temperature steam for power generation; S4. Mix the high-temperature solid particle heat storage material with gas for heat exchange to obtain high-temperature flue gas; at least part of the high-temperature flue gas is returned to the peak-shaving boiler.

2. The high-temperature heat storage method for a coupled peak-shaving boiler according to claim 1, characterized in that: Step S1 is performed during the load reduction phase of the peak-shaving boiler; step S3 is performed during the load increase phase of the peak-shaving boiler; and step S4 is performed during the load increase phase of the peak-shaving boiler.

3. The high-temperature heat storage method for a coupled peak-shaving boiler according to claim 1, characterized in that: Step S4 is performed during the deep peak-shaving stage of the peak-shaving boiler.

4. The high-temperature heat storage method for coupled peak-shaving boilers according to claim 1, characterized in that: The materials of the low-temperature solid particle heat storage material and the high-temperature solid particle heat storage material include Al2O3 and / or SiO2.

5. A system for executing the high-temperature heat storage method for coupled peak-shaving boilers according to claim 1, characterized in that: It includes a cyclone separator group, a high-temperature silo, a first heat exchange bed, and a low-temperature silo; the high-temperature silo is used to store the high-temperature solid particle heat storage material; the low-temperature silo is used to store the low-temperature solid particle heat storage material; The cyclone separator group is provided with a separator group feed port, a separator group air inlet and a separator group discharge port; the separator group air inlet is connected to the smoke exhaust port of the peak-shaving boiler; the separator group feed port is connected to the low-temperature silo; the separator group discharge port is connected to the high-temperature silo; The first heat exchange bed is provided with a hot material inlet, a cold material outlet, a low-temperature gas inlet, a high-temperature gas outlet, a low-temperature steam inlet and a high-temperature steam outlet; the hot material inlet is connected to the high-temperature material bin; the cold material outlet is connected to the low-temperature material bin; the high-temperature gas outlet is connected to the peak-shaving boiler.

6. The system according to claim 5, characterized in that: The high-temperature gas outlet is communicated with the primary air inlet of the peak-shaving boiler.

7. The system according to claim 5, characterized in that: The first heat exchange bed comprises a bubbling heat exchange bed; a steam heat exchanger is provided in the bubbling heat exchange bed; the low-temperature steam inlet and the high-temperature steam outlet are in communication with the steam heat exchanger.

8. The system according to claim 7, characterized in that: The bubbling heat exchange bed is provided with a plurality of heat exchange zones according to the temperature.

9. The system according to claim 7, characterized in that: It also includes a second heat exchange bed; the second heat exchange bed includes a flue gas heat exchange bed and a gas-solid separator; the feed inlet of the flue gas heat exchange bed is connected to the high-temperature silo, and the exhaust port of the flue gas heat exchange bed is connected to the air inlet of the gas-solid separator; the discharge port of the gas-solid separator is connected to the hot material inlet of the first heat exchange bed.

10. The system according to claim 5, characterized in that: A spiral baffle is provided on the inner wall of the final cyclone separator of the cyclone separator group; the spiral baffle is a spiral formed by a strip plate; the axis of the spiral coincides with the axis of the final cyclone separator.

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