Self-heat-storage circulating fluidized bed boiler and operation method thereof

Abstract

The invention relates to a self-heat-storage circulating fluidized bed boiler and an operation method thereof.The self-heat-storage circulating fluidized bed boiler comprises a hearth, a separator, a circulating material returning device and a convection vertical shaft, a material storage bed is arranged between the hearth and the separator, and a smoke inlet of the material storage bed is connected with a hearth outlet through a hearth rear flue; a flue gas outlet of the material storage bed is connected with an inlet of the separator through a flue behind the bed; the lower part of the storage bed is connected with a storage material returning device; the storage material returning device is connected with the dense-phase area through a storage material returning pipe; and the stored material returning device is connected with the stored material circulating loosening fan through the stored material loosening valve. When the boiler needs to rapidly reduce the load, high-temperature materials can be temporarily stored to reduce heat release, the boiler is reasonable in structural layout, can be seamlessly combined with an existing circulating fluidized bed boiler, directly stores the high-temperature materials of a system, and is convenient to operate and run and high in efficiency; in addition, the high-temperature materials can be dynamically updated, and the continuous adjustable load capacity can be kept.

Description

Technical Field

[0001] The present invention belongs to the technical field of circulating fluidized bed boilers, and particularly relates to a self-thermal storage circulating fluidized bed boiler. The present invention also relates to an operation method of the self-thermal storage circulating fluidized bed boiler. Background Art

[0002] Circulating fluidized bed is a clean combustion technology, which has the advantages of high combustion efficiency, low pollutant emissions, strong load change ability, wide fuel adaptability, etc.

[0003] With the large-scale operation of intermittent renewable energy power such as solar energy and wind energy, the power grid has to adjust the load regulation range of thermal power generation to cut peaks and fill valleys in order to create conditions for the grid connection of renewable energy. Circulating fluidized bed is the main unit of thermal power generation and has the advantage of a wide load regulation range, so it naturally becomes the preferred unit for flexible peak regulation. This requires that the circulating fluidized bed boiler must have higher rapid load increase and rapid load decrease capabilities.

[0004] Energy storage in circulating fluidized bed boilers is an effective measure to improve the rapid load increase and decrease capabilities. For example, a circulating fluidized bed unit that can rapidly increase and decrease the load stores high-temperature materials in the furnace by setting up a temporary storage component. When rapid load increase is required, the high-temperature materials are conveyed to the furnace. However, since the temporary storage component is arranged in the dense phase zone of the boiler, the stored material particles become larger. When fed into the furnace, the effective bed material is less and the heat transfer performance is poor. Another circulating fluidized bed fire suppression and peak regulation transformation system introduces the excess hot materials into the gasifier to gasify biomass after fire suppression, so as to realize the conversion of sensible heat energy into chemical energy for energy storage, generate synthesis gas during load reduction, and burn the synthesis gas during load increase to rapidly increase the furnace temperature. However, this method has a complex system and involves combustible gases, and has high explosion-proof grade requirements. There is also an energy storage device based on fluidized bed particles that heats solid particles to a high temperature by electric heating in the fluidized bed, conveys them to the storage system, and then controllably inputs them into the heat exchange system to release the heat carried by the high-temperature particles for power generation. Although this method can store the electric energy of renewable energy in the form of heat and then convert it into electric energy in the form of heat energy, the efficiency of this conversion method is actually not economical.

[0005] Therefore, for the energy storage and peak regulation of circulating fluidized bed boilers, there is an urgent need for a heat storage system that has good integration with the original system, high-temperature energy storage, and heat-based energy storage. Summary of the Invention

[0006] The purpose of the present invention is to provide a self-thermal storage circulating fluidized bed boiler to solve at least some of the above technical problems.

[0007] Another purpose of the present invention is to provide an operation method of the self-thermal storage circulating fluidized bed boiler.

[0008] To achieve the above object, the self-storing heat circulating fluidized bed boiler provided by the present invention includes a furnace, a separator, a circulating returner, and a convection shaft. The lower part of the furnace is a dense phase zone, and the upper part of the furnace is a dilute phase zone. A screen heating surface is provided in the dilute phase zone, and a temperature measuring device for the dilute phase zone is arranged in the dilute phase zone. The flue gas outlet of the separator is connected to the convection shaft through a flue after the separator. An overheater, a reheater, an economizer, and an air preheater are arranged in the convection shaft. The convection shaft is connected to a tail flue. The lower part of the separator is connected to the circulating returner, the circulating returner is connected to the dense phase zone through a circulating return pipe, and the circulating returner is connected to a material circulating loosening fan through a circulating loosening valve. A storage bed is arranged between the furnace and the separator. The flue gas inlet of the storage bed is connected to the furnace outlet through a flue after the furnace, and the flue gas outlet of the storage bed is connected to the inlet of the separator through a flue after the bed. The lower part of the storage bed is connected to a storage returner, the storage returner is connected to the dense phase zone through a storage return pipe, and the storage returner is connected to a storage circulating loosening fan through a storage loosening valve.

[0009] Optionally, a porous flap is arranged in the storage bed. A transmission shaft is arranged in the middle of the porous flap. The transmission shaft is connected to a motor. The center of the transmission shaft is lower than the lower edge of the inner wall of the flue after the furnace. The porous flap is provided with a plurality of balance air holes.

[0010] Optionally, the balance air holes are distributed in the rear part of the porous flap facing the oncoming flue gas flow.

[0011] Optionally, with the transmission shaft as the boundary, the porous flap is divided into a front side area and a rear side area. The balance air holes are distributed in the rear part of the front side area and the rear side area of the porous flap.

[0012] Optionally, the cross section of the porous flap is a streamline cross section formed by an arc.

[0013] Optionally, the porosity of the porous flap is 10% - 30%, and the diameter of the balance air holes is 2 mm - 5 mm.

[0014] Optionally, the transmission shaft is a hollow shaft, and its interior is used for ventilation and cooling.

[0015] Optionally, multiple groups of the porous flaps are provided, and the multiple groups of the porous flaps form a shutter structure that can be opened and closed.

[0016] Optionally, the cross section of the storage bed is rectangular, and the surrounding wall surfaces enclosing the storage bed are of an adiabatic structure.

[0017] Optionally, a temperature measuring device for the storage bed is provided above the bottom of the storage bed, and a high-temperature radar level gauge is provided below the lower edge of the flue gas outlet of the storage bed.

[0018] To achieve the above-mentioned another object, the operation method of the self-thermal storage circulating fluidized bed boiler provided by the present invention uses the self-thermal storage circulating fluidized bed boiler as described in any one of the above, and includes:

[0019] Start the self-thermal storage circulating fluidized bed boiler: supply primary air through the primary air supply device, supply secondary air through the secondary air supply device, and supply solid fuel through the fuel supply device;

[0020] Constant load operation: the amount of primary air supplied by the primary air supply device, the amount of secondary air supplied by the secondary air supply device, and the amount of solid fuel supplied by the fuel supply device remain unchanged, and the included angle α between the porous flap and the horizontal direction is maintained at about 0 degrees;

[0021] First energy storage: close the storage material loosening valve, turn on the motor, drive the porous flap to rotate clockwise through the transmission shaft, the included angle α between the porous flap and the horizontal direction increases, and the high-temperature particles carried in the flue gas flow are blocked by the porous flap and fall to the bottom of the storage bed until the level height h monitored by the high-temperature radar level gauge is greater than the set height h1;

[0022] Energy storage update: when the level height h monitored by the high-temperature radar level gauge is greater than the set height h2, h1>h2, and the temperature monitored by the temperature measuring device of the storage bed is lower than the temperature monitored by the temperature measuring device of the dilute phase zone by ΔT1, turn on the motor, drive the porous flap to rotate clockwise through the transmission shaft, the included angle α between the porous flap and the horizontal direction increases, and the high-temperature particles carried in the flue gas flow are blocked by the porous flap and fall to the bottom of the storage bed. At the same time, open the storage material loosening valve and gradually increase the opening degree, and send the high-temperature material in the storage bed into the dense phase zone to realize the replacement of the high-temperature material until the temperature monitored by the temperature measuring device of the storage bed is lower than the temperature monitored by the temperature measuring device of the dilute phase zone by ΔT2.

[0023] Further, the set height h1 is 1 / 2 to 2 / 3 of the height ht from the high-temperature radar level gauge to the bottom of the storage bed, and the set height h2 is 1 / 4 to 1 / 3 of the height ht from the high-temperature radar level gauge to the bottom of the storage bed.

[0024] Further, when ΔT1 is 90°C - 100°C, ΔT2 is 10°C - 20°C.

[0025] Further, it further includes:

[0026] Normal load increase: first increase the primary air through the primary air supply device, increase the secondary air through the secondary air supply device, and then increase the solid fuel through the fuel supply device.

[0027] Further, it also includes:

[0028] Quick load increase: While increasing the load normally, open the storage bin loosening valve and gradually increase the opening degree to send the high-temperature materials in the storage bin into the dense phase zone.

[0029] Further, it also includes:

[0030] Normal load decrease: First, reduce the solid fuel through the fuel supply device, then reduce the primary air through the primary air supply device, and reduce the secondary air through the secondary air supply device.

[0031] Further, it also includes:

[0032] Quick load decrease: While decreasing the load normally, turn on the motor, drive the porous flap to rotate clockwise through the transmission shaft, the included angle α between the porous flap and the horizontal direction increases, and the high-temperature particles carried in the flue gas are blocked by the porous flap and fall to the bottom of the storage bin to be stored as high-temperature materials.

[0033] When the self-thermal storage circulating fluidized bed boiler provided by the present invention is in routine operation, it can continuously store the high-temperature materials of the circulating bed itself. When it is necessary to quickly increase the load, the stored materials are released to release heat; when it is necessary to quickly decrease the load, the high-temperature materials are temporarily stored to reduce heat release. Its structural layout is reasonable, it can be seamlessly combined with the existing circulating fluidized bed boiler, directly store the high-temperature materials of the system itself, is convenient to operate, has high efficiency; moreover, the high-temperature materials can be dynamically updated, and it can maintain continuous adjustable load capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of a self-thermal storage circulating fluidized bed boiler provided by an embodiment of the present invention;

[0035] Figure 2 For Figure 1 The top view of the self-thermal storage circulating fluidized bed boiler shown;

[0036] Figure 3 For Figure 1 The schematic structural diagram of the porous flap of the storage bin shown in ;

[0037] Figure 4 It is the streamline cross-sectional view of the porous flap.

[0038] In the figure:

[0039] 1 - Dense phase zone; 2 - Furnace; 3 - Platen heating surface; 4 - Lean phase zone; 5 - Rear flue of furnace; 6 - Storage bed; 7 - Flue behind bed; 8 - Separator; 9 - Flue behind separator; 10 - Convection shaft; 11 - Superheater; 12 - Reheater; 13 - Economizer; 14 - Air preheater; 15 - Tail flue; 16 - Material circulation loosening fan; 17 - Storage material circulation loosening fan; 18 - Circulating material return device; 19 - Storage material return device; 20 - Temperature measuring device for storage bed; 21 - Temperature measuring device for lean phase zone; 22 - High-temperature radar level gauge; 23 - High-temperature material; 24 - Storage material loosening valve; 25 - Circulation loosening valve; 26 - Porous flap; 27 - Motor; 28 - Balancing air hole; 29 - Transmission shaft; 30 - Rear part of flue gas incoming flow; 31 - Fuel supply device; 32 - Primary air supply device; 33 - Secondary air supply device; 181 - Circulating material return pipe; 191 - Storage material return pipe. Detailed implementation manners

[0040] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0041] In this article, terms such as "upper, lower, inner, outer" are established based on the positional relationship shown in the drawings. Depending on the different drawings, the corresponding positional relationship may also change accordingly. Therefore, it cannot be understood as an absolute limitation of the protection scope; moreover, relational terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0042] Please refer to Figure 1 and Figure 2 which Figure 1 is a schematic structural diagram of a self-storing heat circulating fluidized bed boiler provided by an embodiment of the present invention; Figure 2 and Figure 1 is a top view of the self-storing heat circulating fluidized bed boiler shown in

[0043] As shown in the figure, in a specific embodiment, the self-storing heat circulating fluidized bed boiler provided by the present invention mainly consists of parts such as a furnace 2, a separator 8, a circulating material return device 18, and a convection shaft 10. Among them, the lower part of the furnace 2 is a dense phase zone 1, and the upper part of the furnace 2 is a lean phase zone 4; a platen heating surface 3 is suspended in the lean phase zone 4, and a temperature measuring device 21 for the lean phase zone is arranged in the lean phase zone 4; the flue gas outlet of the separator 8 is connected to the convection shaft 10 through a flue 9 behind the separator.

[0044] In the convection shaft 10, there are arranged a superheater 11, a reheater 12, an economizer 13, and an air preheater 14. The convection shaft 10 is connected to the tail flue 15. The lower part of the separator 8 is connected to the circulating material return device 18. The circulating material return device 18 is connected to the dense phase zone 1 through a circulating material return pipe 181. The circulating material return device 18 is connected to the material circulation loosening fan 16 through a circulating loosening valve 25.

[0045] A storage bed 6 is arranged between the furnace 2 and the separator 8. The cross-section of the storage bed 6 is rectangular, and the surrounding wall surfaces enclosing the storage bed 6 are of heat-insulating structure.

[0046] Above the bottom of the storage bed 6, there is arranged a temperature measuring device 20 for the storage bed. Below the lower edge of the flue gas outlet of the storage bed 6, there is arranged a high-temperature radar level gauge 22.

[0047] The flue gas inlet of the storage bed 6 is connected to the outlet of the furnace 2 through the rear flue 5 of the furnace. The flue gas outlet of the storage bed 6 is connected to the inlet of the separator 8 through the flue 7 behind the bed. The lower part of the storage bed 6 is connected to the storage material return device 19. The storage material return device 19 is connected to the dense phase zone 1 through a storage material return pipe 191. The storage material return device 19 is connected to the storage material circulation loosening fan 17 through a storage material loosening valve 24.

[0048] Please also refer to Figure 3 、 Figure 4 , Figure 3 which is Figure 1 the structural schematic diagram of the porous flap of the storage bed shown in Figure 4 and

[0049] is

[0050] the streamline cross-section schematic diagram of the porous flap. As shown in the figure, in the storage bed 6, there are arranged porous flaps 26. The cross-section of the porous flap 26 is a streamline cross-section formed by an arc. In the middle of the porous flap 26, there is a transmission shaft 29. The transmission shaft 29 is a hollow shaft, and its interior is used for ventilation and cooling. The transmission shaft 29 is connected to the motor 27. The center of the transmission shaft 29 is lower than the lower edge of the inner wall of the rear flue 5 of the furnace. The porous flap 26 is provided with a plurality of balance air holes 28, and the balance air holes 28 are distributed in the rear part 30 of the porous flap 26 facing the oncoming flue gas flow.

[0051] Specifically, if the transmission shaft 29 is taken as the boundary, the porous flap 26 can be divided into a front side area and a rear side area. The balance air holes 28 are distributed in the rear part of the front side area and the entire rear side area of the porous flap 26, that is, the rear part of the front side area and the entire rear side area of the porous flap 26 together form the rear part 30, and its area accounts for about three-quarters of the entire porous flap 26.

[0052] The working principle of this self-thermal storage circulating fluidized bed boiler is as follows:

[0053] By connecting a storage bed 6 in series between the furnace 2 and the separator 8 of a circulating fluidized bed boiler, and arranging a porous flap 26 in the storage bed 6, when it is necessary to intercept materials, the porous flap 26 flips, and the wall surface of the porous flap 26 faces the oncoming direction of the flue gas. The large-scale high-temperature particles carried in the flue gas hit the wall surface of the porous flap 26 and fall to the bottom of the storage bed 6 after inertial separation. The flue gas separated from the high-temperature particles can then flow out through the balance air holes 28 after flipping to further intercept small-scale fine particles and flow to the downstream separator 8. By changing the angle of the porous flap 26, the quantity of intercepted high-temperature particles can be adjusted. A worm and worm gear drive can be used between the porous flap 26 and the motor 27, so that the porous flap 26 has a self-locking function and can resist the impact resistance of the flue gas flow. To reduce the resistance, the cross-section of the porous flap 26 is made streamlined.

[0054] The materials stored in the storage bed 6 are about 1 / 2 to 2 / 3 of the total volume of the storage bed. In this way, when it is necessary to quickly increase the load, the materials in the lower part of the storage bed 6 can be released in time; when it is necessary to quickly reduce the load, the materials can be intercepted in the upper space of the storage bed 6 in time.

[0055] The high-temperature materials stored in the storage bed 6 are wide-screened materials, that is, they include medium and large-scale effective bed materials (particle size about 0.1 mm or more) that can be captured by the separator 8, and also include small particle fly ash (particle size about 0.1 mm or less) that cannot be captured by the separator 8. Such high-temperature materials have a stronger load regulation ability.

[0056] The lower part of the storage bed 6 is connected to the storage material return device 19. The storage material return device 19 is a fluidized bed structure. Through aerated fluidization, the high-temperature materials in the storage bed 6 can be returned to the boiler furnace 2, and the aerated fluidization gas can enter the boiler furnace 2 or flow through the high-temperature materials in the storage bed 6 and then flow to the downstream separator 8 through the balance air holes. The diameter of the balance air holes 28 and the opening rate of the porous flap 26 can ensure that when the porous flap 26 is in the horizontal closed position, as few particles as possible leak into the storage bed 6, and at the same time, when the porous flap 26 is opened, the air pocketing is minimized to reduce the flow resistance.

[0057] The above embodiments are only the preferred solutions of the present invention, and the specific ones are not limited thereto. On this basis, targeted adjustments can be made according to actual needs to obtain different implementation manners. For example, multiple groups of porous flaps 26 are provided, and the multiple groups of porous flaps 26 form a shutter structure that can be opened and closed, and so on. Since there are many possible implementation manners, they will not be exemplified one by one here.

[0058] In addition to the above self-storing heat circulating fluidized bed boiler, the present invention also provides a method for operating a self-storing heat circulating fluidized bed boiler, which uses the self-storing heat circulating fluidized bed boiler described above and includes:

[0059] Start-up self-thermal storage circulating fluidized bed boiler: Primary air is supplied through the primary air supply device 32, secondary air is supplied through the secondary air supply device 33, and solid fuel is supplied through the fuel supply device 31.

[0060] Constant load operation: The amount of primary air supplied by the primary air supply device 32, the amount of secondary air supplied by the secondary air supply device 33, and the amount of solid fuel supplied by the fuel supply device 31 remain unchanged, and the angle α between the porous flap 26 and the horizontal direction is maintained at about 0 degrees;

[0061] First energy storage: Close the storage material loosening valve 24, turn on the motor 27, drive the porous flap 26 to rotate clockwise through the transmission shaft 29, the angle α between the porous flap 26 and the horizontal direction increases, and the high-temperature particles carried in the flue gas flow are blocked by the porous flap 26 and fall to the bottom of the storage bed 6 until the measured material level height h monitored by the high-temperature radar level gauge 22 is greater than 1 / 2 of the height ht from the high-temperature radar level gauge 22 to the bottom of the storage bed 6.

[0062] Energy storage update: When the measured material level height h monitored by the high-temperature radar level gauge 22 is greater than 1 / 3 of the height ht from the high-temperature radar level gauge 22 to the bottom of the storage bed 6, and the temperature monitored by the storage bed temperature measuring device 20 is 100°C lower than the temperature monitored by the dilute phase zone temperature measuring device 21, turn on the motor 27, drive the porous flap 26 to rotate clockwise through the transmission shaft 29, the angle α between the porous flap 26 and the horizontal direction increases, and the high-temperature particles carried in the flue gas flow are blocked by the porous flap 26 and fall to the bottom of the storage bed 6. At the same time, open the storage material loosening valve 24 and gradually increase the opening degree, send the high-temperature material 23 in the storage bed 6 into the dense phase zone 1 to realize the replacement of the high-temperature material 23 until the temperature monitored by the storage bed temperature measuring device 20 is 10°C lower than the temperature monitored by the dilute phase zone temperature measuring device 21.

[0063] Normal load increase: First, increase the primary air through the primary air supply device 32, increase the secondary air through the secondary air supply device 33, and then increase the solid fuel through the fuel supply device 31.

[0064] Rapid load increase: While increasing the load normally, open the storage material loosening valve 24 and gradually increase the opening degree, and send the high-temperature material 23 in the storage bed 6 into the dense phase zone 1.

[0065] Normal load decrease: First, reduce the solid fuel through the fuel supply device 31, then reduce the primary air through the primary air supply device 32, and reduce the secondary air through the secondary air supply device 33.

[0066] Quick load reduction: While reducing the load normally, turn on the motor 27, drive the porous flap 26 to rotate clockwise through the transmission shaft 29. The angle α between the porous flap 26 and the horizontal direction increases, and the high-temperature particles carried in the flue gas flow are blocked by the porous flap 26 and fall to the bottom of the storage bed 6 to be stored as the high-temperature material 23.

[0067] The above has introduced in detail the heat storage circulating fluidized bed boiler and its operation method provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. Self-storing heat circulating fluidized bed boiler, characterized in that, It includes a furnace chamber (2), a separator (8), a circulating material returner (18), and a convection shaft (10). The lower part of the furnace chamber (2) is a dense phase zone (1), and the upper part of the furnace chamber (2) is a dilute phase zone (4). A platen heating surface (3) is provided in the dilute phase zone (4), and a dilute phase zone temperature measuring device (21) is arranged in the dilute phase zone (4). The flue gas outlet of the separator (8) is connected to the convection shaft (10) through a flue after the separator (9). An overheater (11), a reheater (12), an economizer (13), and an air preheater (14) are arranged in the convection shaft (10). The convection shaft (10) is connected to the tail flue (15). The lower part of the separator (8) is connected to the circulating material returner (18), the circulating material returner (18) is connected to the dense phase zone (1) through a circulating material return pipe (181), and the circulating material returner (18) is connected to a material circulating loosening fan (16) through a circulating loosening valve (25). It is characterized in that a storage bed (6) is arranged between the furnace chamber (2) and the separator (8). The flue gas inlet of the storage bed (6) is connected to the outlet of the furnace chamber (2) through a flue after the furnace chamber (5), and the flue gas outlet of the storage bed (6) is connected to the inlet of the separator (8) through a flue after the bed (7). The lower part of the storage bed (6) is connected to a storage material returner (19), the storage material returner (19) is connected to the dense phase zone (1) through a storage material return pipe (191), and the storage material returner (19) is connected to a storage material circulating loosening fan (17) through a storage material loosening valve (24).

2. The self-storing heat circulating fluidized bed boiler according to claim 1, characterized in that, A porous flap (26) is arranged in the storage bed (6). A transmission shaft (29) is arranged in the middle of the porous flap (26). The transmission shaft (29) is connected to a motor (27). The center of the transmission shaft (29) is lower than the lower edge of the inner wall of the flue after the furnace chamber (5). A plurality of balance air holes (28) are opened on the porous flap (26).

3. The self-storing heat circulating fluidized bed boiler according to claim 2, wherein The balance air holes (28) are distributed in the rear part (30) of the porous flap (26) facing the flue gas flow direction.

4. The self-storing heat circulating fluidized bed boiler according to claim 3, characterized in that, Taking the transmission shaft (29) as the boundary, the porous flap (26) is divided into a front side area and a rear side area. The balance air holes (28) are distributed in the rear part of the front side area and the rear side area of the porous flap (26).

5. The self-storing heat circulating fluidized bed boiler according to claim 4, characterized in that, The cross section of the porous flap (26) is a streamline cross section formed by an arc.

6. The self-storing heat circulating fluidized bed boiler according to claim 5, characterized in that, The porosity of the porous flap (26) is 10% - 30%, and the diameter of the balance air holes is 2 mm - 5 mm.

7. The self-storing heat circulating fluidized bed boiler according to claim 2, wherein The transmission shaft (29) is a hollow shaft, and its interior is used for ventilation and cooling.

8. The self-storing heat circulating fluidized bed boiler according to claim 2, wherein There are multiple groups of the porous flaps (26), and the multiple groups of the porous flaps (26) form a shutter structure that can open and close.

9. The self-storing heat circulating fluidized bed boiler according to claim 2, characterized in that, The cross section of the storage bed (6) is rectangular, and the surrounding wall surfaces enclosing the storage bed (6) are adiabatic structures.

10. The self-storing heat circulating fluidized bed boiler according to claim 1, wherein A storage bed temperature measuring device (20) is arranged above the bottom of the storage bed (6), and a high-temperature radar level gauge (22) is arranged below the lower edge of the flue gas outlet of the storage bed (6).

11. Operating method of self-thermal storage circulating fluidized bed boiler, which uses the self-thermal storage circulating fluidized bed boiler described in any one of claims 1 to 10, including: Starting the self-thermal storage circulating fluidized bed boiler: supplying primary air through the primary air supply device (32), supplying secondary air through the secondary air supply device (33), and supplying solid fuel through the fuel supply device (31); Constant load operation: The amount of primary air supplied by the primary air supply device (32), the amount of secondary air supplied by the secondary air supply device (33), and the amount of solid fuel supplied by the fuel supply device (31) remain unchanged, and the angle α between the porous flap (26) and the horizontal direction is maintained at about 0 degrees; First energy storage: Closing the storage material loosening valve (24), turning on the motor (27), driving the porous flap (26) to rotate clockwise through the transmission shaft (29), the angle α between the porous flap (26) and the horizontal direction increases, and the high-temperature particles carried in the flue gas flow are blocked by the porous flap (26) and fall to the bottom of the storage material bed (6) until the material level height h monitored by the high-temperature radar level gauge (22) is greater than the set height h1; Energy storage update: When the material level height h monitored by the high-temperature radar level gauge (22) is greater than the set height h2, h1>h2, and the temperature monitored by the storage material bed temperature measuring device (20) is lower than the temperature monitored by the dilute phase zone temperature measuring device (21) by ΔT1, turn on the motor (27), drive the porous flap (26) to rotate clockwise through the transmission shaft (29), the angle α between the porous flap (26) and the horizontal direction increases, and the high-temperature particles carried in the flue gas flow are blocked by the porous flap (26) and fall to the bottom of the storage material bed (6). At the same time, open the storage material loosening valve (24) and gradually increase the opening degree, and send the high-temperature material (23) in the storage material bed (6) into the dense phase zone (1) to realize the replacement of the high-temperature material (23) until the temperature monitored by the storage material bed temperature measuring device (20) is lower than the temperature monitored by the dilute phase zone temperature measuring device (21) by ΔT2.

12. The operating method of the self-thermal storage circulating fluidized bed boiler according to claim 11, characterized in that, The set height h1 is 1 / 2 to 2 / 3 of the height ht from the high-temperature radar level gauge (22) to the bottom of the storage material bed (6), and the set height h2 is 1 / 4 to 1 / 3 of the height ht from the high-temperature radar level gauge (22) to the bottom of the storage material bed (6).

13. The operating method of the self-thermal storage circulating fluidized bed boiler according to claim 11, wherein When ΔT1 is 90°C - 100°C, ΔT2 is 10°C - 20°C.

14. The operation method of the self-thermal storage circulating fluidized bed boiler according to claim 11, characterized in that, It also includes: Normal load increase: First, increase the primary air through the primary air supply device (32), increase the secondary air through the secondary air supply device (33), and then increase the solid fuel through the fuel supply device (31).

15. The operation method of the self-thermal storage circulating fluidized bed boiler according to claim 11, characterized in that, It also includes: Rapid load increase: While increasing the load normally, open the storage material loosening valve (24) and gradually increase the opening degree, and send the high-temperature material (23) in the storage material bed (6) into the dense phase zone (1).

16. The operation method of the self-thermal storage circulating fluidized bed boiler according to claim 11, characterized in that, It also includes: Normal load decrease: First, reduce the solid fuel through the fuel supply device (31), and then reduce the primary air through the primary air supply device (32) and reduce the secondary air through the secondary air supply device (33).

17. The operation method of the self-thermal storage circulating fluidized bed boiler according to claim 11, characterized in that, It also includes: Rapid load reduction: While reducing the load normally, turn on the motor (27), drive the porous flap (26) to rotate clockwise through the transmission shaft (29), the angle α between the porous flap (26) and the horizontal direction increases, and the high-temperature particles carried in the flue gas flow are blocked by the porous flap (26) and fall to the bottom of the storage bed (6) to be stored as high-temperature materials (23).

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