Circulating fluidized bed boiler, method for variable load regulation, solid material treatment device

Abstract

The application provides a circulating fluidized bed boiler, a method for regulating load variation of the circulating fluidized bed boiler and a solid material processing device, and belongs to the technical field of combustion. The circulating fluidized bed boiler comprises a hearth, a primary air distribution plate, an adjusting bunker air distribution plate, an adjusting bunker partition door and a driving device. The lower part of the hearth comprises a material main circulation zone and a material adjusting bunker zone which are arranged adjacently. The adjusting bunker air distribution plate is arranged at the bottom of the material adjusting bunker zone and is used for introducing fluidizing air into the material adjusting bunker zone. The adjusting bunker partition door separates the lower part of the hearth into the material main circulation zone and the material adjusting bunker zone. The driving device is used for driving the adjusting bunker partition door to open or close upwards or downwards along the horizontal plane where the adjusting bunker partition door is located, so that the communication area between the material main circulation zone and the material adjusting bunker zone is enlarged or reduced. The load of the hearth is increased or decreased along with the increase or decrease of the amount of heat storage material stored in the material adjusting bunker zone and released into the material main circulation zone.

Description

Technical Field

[0001] This invention belongs to the field of combustion technology, and particularly relates to a circulating fluidized bed boiler, a method for variable load regulation, and a solid material handling device. Background Technology

[0002] Circulating fluidized bed (CFB) reactors are highly efficient and clean reactors used in combustion and gasification. The extensive material exchange within a CFB reduces the impact of fuel fluctuations on the reaction. With the further implementation of the "dual carbon" target and the gradual promotion and development of new energy sources, existing thermal power units will transition from full-load combustion power generation to units with deep and flexible peak-shaving operation to improve their capacity to absorb new energy. However, due to the high thermal inertia and strong lag in the combustion process of CFB boilers, they suffer from slow load response rates and poor load adjustment flexibility during peak-shaving. For example, the large amount of bed material in the CFB boiler furnace results in relatively slow changes in furnace temperature and heat transfer coefficient during load adjustment, leading to a slow response to load increases and decreases. As the boiler load decreases, the reduced primary air volume leads to decreased fluidity of particles participating in the overall circulation within the furnace. Most material accumulates at the bottom of the furnace, increasing the material in the dense phase zone and affecting the fluidization uniformity of the bottom material. This, in turn, causes significant fluctuations in bed pressure, ultimately reducing combustion efficiency and hindering low-NOx combustion control. In addition, during the load increase phase, the low bed temperature in the furnace results in a low temperature of the circulating material, making it difficult to quickly increase the overall load of the boiler through material circulation.

[0003] In the process of developing this invention, it was discovered that existing circulating fluidized bed (CFB) boilers typically require structural modifications to achieve rapid load adjustment, particularly by adding an external circulating ash regulating silo in the return feeder area. However, this often increases the complexity of the original CFB boiler structure, especially given the limited space near the separator and return feeder. Furthermore, the structural changes increase boiler maintenance and repair costs. The invention also fails to substantially address the need for higher primary air levels during low-load periods to ensure uniform fluidization of materials across multiple beds within the furnace, and the question of whether materials within the boiler can be effectively circulated and utilized remains.

[0004] Therefore, existing structural improvement technologies still face challenges such as insufficient space for furnace improvement, ineffective material circulation, and potential safety hazards. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] In view of this, the present invention provides a circulating fluidized bed boiler, a method for variable load regulation, and a solid material handling device to at least partially solve the above-mentioned problems.

[0007] (II) Technical Solution

[0008] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0009] As a first aspect of the present invention, a circulating fluidized bed boiler is provided, comprising:

[0010] The furnace chamber includes an adjacent main material circulation zone and a material regulating and storage zone at its lower part.

[0011] The primary air distribution plate is located at the bottom of the main material circulation area and is used to introduce primary air into the main material circulation area.

[0012] The regulating air distribution plate is located at the bottom of the material regulating storage area and is used to introduce fluidizing air into the material regulating storage area.

[0013] Adjust the storage bin partition door to divide the lower part of the furnace into a main material circulation area and a material regulating storage area;

[0014] A drive device is used to drive the regulating storage bin partition door to open and close along the horizontal plane where the regulating storage bin partition door is located, such that when the regulating storage bin partition door is opened along the horizontal plane where the regulating storage bin partition door is located, the connection area between the main material circulation area and the material regulating storage bin area expands, and when the regulating storage bin partition door is closed along the horizontal plane where the regulating storage bin partition door is located, the connection area between the main material circulation area and the material regulating storage bin area shrinks.

[0015] In one embodiment, wherein:

[0016] The regulating storage compartment partition door is connected to the side wall of the furnace, wherein at least one end of the regulating storage compartment partition door is a free-moving end;

[0017] The drive device is used to drive at least one end of the regulating storage bin partition door to open and close along the horizontal plane where the regulating storage bin partition door is located, either upward or downward, to facilitate the transfer of heat-storing materials between the main material circulation area and the material regulating storage bin area.

[0018] In one embodiment, wherein:

[0019] The storage compartment partition door has a bend at its center. The upper end of the storage compartment partition door is hinged to the inner wall of the furnace, while the lower end of the storage compartment partition door is a free-moving end.

[0020] At least one of the lower left and right ends of the adjustable storage compartment partition door is connected to a drive device, so that the drive device can drive the lower end of the adjustable storage compartment partition door to open and close along the horizontal plane where the upper end of the adjustable storage compartment partition door is located, with the inflection point of the adjustable storage compartment partition door as the axis.

[0021] In one embodiment, wherein:

[0022] The furnace is used to fluidize and burn fuel particles and oxidant to obtain regenerated heat material. A gas-solid product outlet is located at the top of the furnace. Part of the regenerated heat material is discharged through this outlet, while the remaining material circulates within the furnace. The regenerated heat material includes fuel particles and unburned fuel particles within the furnace.

[0023] Circulating fluidized bed boilers also include:

[0024] A separator is used to separate gaseous and solid products to obtain heat storage materials. The separator is connected to the outlet of the gaseous and solid products, and the waste gas in the separated gaseous and solid products is discharged through the tail flue.

[0025] The return feeder is used to return the heat storage material to the furnace. The return feeder is connected to the outlet of the separator and to the furnace through the return feed leg. The lower part of the furnace is used to receive and store the heat storage material.

[0026] In one embodiment, wherein:

[0027] The material conditioning storage area does not include a heated surface, and the inner wall of the material conditioning storage area is lined with heat-insulating, wear-resistant and fire-resistant material;

[0028] The adjustable storage compartment partition doors are made of fire-resistant and wear-resistant materials.

[0029] As a second aspect of the present invention, a method for variable load regulation using a circulating fluidized bed boiler is provided, comprising:

[0030] During the load reduction adjustment stage of the circulating fluidized bed boiler, the adjustment storage diaphragm door is driven to open upward along the horizontal plane where the adjustment storage diaphragm door is located by the drive device. After the connection area between the main material circulation area and the material adjustment storage area is expanded, some of the heat storage material in the lower part of the furnace is transported to the material adjustment storage area for storage, so as to reduce the load of the circulating fluidized bed boiler.

[0031] When the load of the circulating fluidized bed boiler is reduced to the predetermined load condition, the drive device is used to drive the regulating storage silo door to close downward along the horizontal plane where the regulating storage silo door is located, so that the connection area between the main material circulation area and the material regulating storage area is reduced to the closed state.

[0032] In one embodiment, driving the adjustable storage compartment partition door to open and close along the horizontal plane where the adjustable storage compartment partition door is located, either upwards or downwards, using a driving device includes:

[0033] The single-sided adjustable storage compartment partition door is opened or closed by using a drive device to move it upwards or downwards along the horizontal plane where the adjustable storage compartment partition door is located; or

[0034] The double-sided adjustable storage compartment partition doors are opened or closed by using a drive device to move the horizontal plane of the adjustable storage compartment partition doors upward or downward.

[0035] In one embodiment, wherein:

[0036] The primary air distribution panel and the regulating storage air distribution panel can operate simultaneously or independently;

[0037] The air distribution velocity of the primary air distribution plate and the fluidizing air distribution plate of the regulating storage silo is determined by the air distribution area ratio of the primary air distribution plate and the regulating storage silo air distribution plate.

[0038] In one embodiment, wherein:

[0039] Control the primary air distribution of the primary air distribution plate and / or adjust the fluidizing air speed of the storage air distribution plate so that some of the heat storage material in the lower part of the furnace can circulate in the circulating fluidized bed boiler.

[0040] In one embodiment, the method for adjusting the load of a circulating fluidized bed boiler further includes:

[0041] During the load increase adjustment stage of the circulating fluidized bed boiler, the baffle door of the regulating storage silo is driven to open upward along the horizontal plane where the baffle door is located by the drive device, so as to expand the connection area between the main material circulation area and the material regulating storage silo area. This allows the heat storage material stored in the material regulating storage silo during the load reduction stage to be returned to the main material circulation area through the fluidizing air of the regulating storage silo air distribution plate, forming a combustion area that combines the main material circulation area and the material regulating storage silo area, thereby increasing the load in the furnace.

[0042] By adjusting the speed of the fluidizing air from the air distribution plate in the material conditioning storage area, the heat storage material in the material conditioning storage area can participate in the material circulation in the main material circulation area, thereby improving the response rate of the heat load in the circulating fluidized bed boiler.

[0043] As a third aspect of the present invention, a solid material handling apparatus is provided, comprising a circulating fluidized bed boiler as described in the above embodiments.

[0044] (III) Beneficial Effects

[0045] The circulating fluidized bed boiler, variable load regulation method, and solid material handling device provided by this invention have at least one of the following beneficial effects:

[0046] (1) According to an embodiment of the present invention, an adjustable storage compartment partition door is provided on the inner wall of the furnace of a circulating fluidized bed boiler. The lower part of the furnace is divided into a main material circulation zone and a material adjusting storage compartment zone by the adjustable storage compartment partition door. The adjustable storage compartment partition door is driven to open and close along the horizontal plane where the adjustable storage compartment partition door is located, either upward or downward. When the adjustable storage compartment partition door is opened along the horizontal plane where the adjustable storage compartment partition door is located, the communication area between the main material circulation zone and the material adjusting storage compartment zone expands or shrinks. This allows the heat storage material in the main material circulation zone of the furnace to circulate between the material adjusting storage compartment zones, thereby achieving load regulation in the boiler. The circulating fluidized bed boiler provided by this invention can divide the furnace into a main material circulation zone and a material regulating storage zone by adjusting the storage silo partition door without affecting the normal operation of the original circulating fluidized bed boiler. The movement of the regulating storage silo partition door is controlled by the drive device to realize the circulation of heat storage materials. This simplifies the complexity of improving the existing boiler structure design and solves the problems of insufficient space for improvement and high maintenance costs of existing boilers.

[0047] (2) According to an embodiment of the present invention, by adjusting the size of the connecting area between the material regulating storage area and the main material circulation area by adjusting the storage partition door, the load regulation of the boiler can be achieved by controlling the amount of material in the furnace, and the load response speed is relatively fast.

[0048] (3) According to an embodiment of the present invention, the material is circulated between the furnace and the material regulating storage area by driving the opening and closing of the storage compartment partition door, thus ensuring stable and smooth material circulation. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the structure of a circulating fluidized bed boiler in one embodiment of the present invention with the regulating storage compartment partition door completely closed;

[0050] Figure 2 This is a schematic diagram of the structure of a circulating fluidized bed boiler in one embodiment of the present invention with the regulating storage compartment partition door fully open;

[0051] Figure 3 A schematic diagram of the structure of the circulating fluidized bed boiler with the regulating storage compartment partition door completely closed in another embodiment of the present invention;

[0052] Figure 4 A schematic diagram of the structure of a circulating fluidized bed boiler with the regulating storage compartment partition door fully open, according to another embodiment of the present invention.

[0053] [Explanation of Labels in the Attached Image]

[0054] 1-Furnace chamber, 2-Separator, 3-Return feeder, 4-Fluid duct, 5-Primary air distribution plate, 6-First regulating storage air distribution plate, 7-Second regulating storage air distribution plate, 8-First drive device, 9-Second drive device, 10-First regulating storage partition door, 11-Second regulating storage partition door, 12-First material regulating storage area, 13-Second material regulating storage area. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0056] To address the issues of insufficient room for improvement, increased boiler complexity, ineffective material circulation and utilization, selection of boiler insulation materials, and potential safety hazards associated with modifications to existing circulating fluidized bed (CFB) boilers during load regulation, this invention provides a CFB boiler, a variable load regulation method, and a solid material handling device. Through a simple structural design, it achieves rapid response in boiler load regulation, reduces the complexity of boiler modifications, preserves room for improvement, and simultaneously enables effective material circulation and utilization within the furnace.

[0057] In view of this, the present invention provides a circulating fluidized bed boiler, comprising: a furnace, a primary air distribution plate, an adjusting storage air distribution plate, an adjusting storage partition door, and a drive device.

[0058] The lower part of the furnace includes a main material circulation zone and a material regulating and storage zone arranged adjacent to each other.

[0059] The primary air distribution plate is located at the bottom of the main material circulation zone and is used to introduce primary air into the main material circulation zone.

[0060] The regulating air distribution plate is located at the bottom of the material regulating storage area and is used to introduce fluidizing air into the material regulating storage area.

[0061] Adjusting the storage bin partition door divides the lower part of the furnace into a main material circulation zone and a material adjustment storage zone.

[0062] A drive device is used to drive the regulating storage bin partition door to open and close along the horizontal plane where the regulating storage bin partition door is located, such that when the regulating storage bin partition door is opened along the horizontal plane where the regulating storage bin partition door is located, the connection area between the main material circulation area and the material regulating storage bin area expands, and when the regulating storage bin partition door is closed along the horizontal plane where the regulating storage bin partition door is located, the connection area between the main material circulation area and the material regulating storage bin area shrinks.

[0063] Figure 1 This is a schematic diagram of the structure of a circulating fluidized bed boiler in one embodiment of the present invention with the regulating storage compartment partition door completely closed; Figure 2 This is a schematic diagram of the structure of a circulating fluidized bed boiler in one embodiment of the present invention, with the regulating storage compartment partition door fully open.

[0064] The following combination Figure 1 and Figure 2 The structure of the circulating fluidized bed boiler in the embodiments of the present invention will be described in detail.

[0065] like Figure 1 and Figure 2 As shown, the circulating fluidized bed boiler includes: a furnace 1, a separator 2, a return feeder 3, a flue 4, a primary air distribution plate 5, an regulating storage air distribution plate including a first regulating storage air distribution plate 6 and a second regulating storage air distribution plate 7, a drive device including a first drive device 8 and a second drive device 9, and a regulating storage partition door including a first regulating storage partition door 10 and a second regulating storage partition door 11.

[0066] According to an embodiment of the present invention, the lower part of the furnace 1 includes a main material circulation zone and a material regulating storage zone arranged adjacent to each other. The material regulating storage zone includes a first material regulating storage zone 12 and a second material regulating storage zone 13. The first material regulating storage zone 12 and the second material regulating storage zone 13 are closely connected to the bottom of the furnace, and the main material circulation zone is located between the first material regulating storage zone 12 and the second material regulating storage zone 13.

[0067] The primary air distribution plate 5 is set at the bottom of the main material circulation area and is used to introduce primary air into the main material circulation area. The primary air distribution plate 5 is equipped with multiple air caps, which are evenly distributed for the outflow of primary air. The distribution speed of primary air is controlled by controlling the air flow rate through the air caps on the primary air distribution plate 5. The air flow rate of primary air is determined by the working area of ​​the air caps on the primary air distribution plate 5.

[0068] The first regulating storage silo air distribution plate 6 is located at the bottom of the first material regulating storage silo area 12, and is used to introduce fluidizing air into the first material regulating storage silo area 12; the second regulating storage silo air distribution plate 7 is located at the bottom of the second material regulating storage silo area 13, and is used to introduce fluidizing air into the second material regulating storage silo area 13. Multiple air caps are evenly distributed on both the first regulating storage silo air distribution plate 6 and the second regulating storage silo air distribution plate 7 for the outflow of fluidizing air. By controlling the airflow rate through the air caps on the first regulating storage silo air distribution plate 6 and the second regulating storage silo air distribution plate 7, the airflow velocity within the first regulating storage silo area 12 and the second regulating storage silo area 13 is controlled.

[0069] The driving device includes a first driving device 8 and a second driving device 9. The first driving device 8 drives the first regulating storage compartment partition door 10 to open and close along the horizontal plane of the first regulating storage compartment partition door 10, either upwards or downwards. This causes the connection area between the main material circulation area and the first material regulating storage compartment area 12 to expand (gradually expand) when the first regulating storage compartment partition door 10 is open (upwards), and to shrink (gradually shrink) the connection area between the main material circulation area and the first material regulating storage compartment area 12 when the first regulating storage compartment partition door 10 is closed (downwards).

[0070] The second drive device 9 drives the second regulating storage compartment partition door 11 to open and close along the horizontal plane of the second regulating storage compartment partition door 11, either upwards or downwards. This causes the connection area between the main material circulation area and the second material regulating storage compartment area 13 to expand (gradually expand) when the second regulating storage compartment partition door 11 is open along the horizontal plane of the second regulating storage compartment partition door 11, and to shrink (gradually shrink) the connection area between the main material circulation area and the second material regulating storage compartment area 13 when the second regulating storage compartment partition door 11 is closed along the horizontal plane of the second regulating storage compartment partition door 11. It should be noted that the first drive device 8 and the second drive device 9 can employ hinge devices to realize the opening and closing of the first regulating storage compartment partition door 10 and the second regulating storage compartment partition door 11.

[0071] In an embodiment of the present invention, by controlling the first regulating storage partition door 10 to open or close along the horizontal plane where the first regulating storage partition door 10 is located, and controlling the second regulating storage partition door 11 to open or close along the horizontal plane where the second regulating storage partition door 11 is located, the storage and release circulation of the heat storage material in the main material circulation area within the first material regulating storage area 12 or the second material regulating storage area 13 is realized.

[0072] To address the issue of high thermal inertia in boilers, existing technologies involve structural modifications to circulating fluidized bed boilers. However, these modifications suffer from limitations such as limited space for improvement, ineffective material circulation, and the inability to quickly adjust loads. In this invention, an adjustable storage compartment partition door is installed on the inner wall of the circulating fluidized bed boiler furnace. This partition door divides the lower part of the furnace into a main material circulation zone and a material adjusting storage zone. A drive device opens and closes the partition door along its horizontal plane, either upwards or downwards. When the partition door is open, the connecting area between the main material circulation zone and the material adjusting storage zone expands or shrinks. This allows the stored heat material in the main material circulation zone to circulate between the material adjusting storage zones, thereby achieving load adjustment within the boiler.

[0073] Furthermore, without affecting the operation of the original circulating fluidized bed boiler, this invention divides the furnace into a main material circulation zone and a material regulating storage zone by adjusting the storage bin partition door. This simplifies the complexity of the existing boiler structure design and solves the problem of insufficient space for improvement in existing boilers. It also enables the circulation of heat storage materials between the furnace and the material regulating storage zone. By controlling the amount of heat storage materials in the furnace, the boiler load can be adjusted, which speeds up the load adjustment response and effectively ensures the circulation of materials.

[0074] According to an embodiment of the present invention, the regulating storage partition door is connected to the side wall of the furnace, wherein at least one end of the regulating storage partition door is a freely movable end; a driving device drives at least one end of the regulating storage partition door to open and close along the horizontal plane where the regulating storage partition door is located, either upwards or downwards, facilitating the transfer of heat-storing materials between the main material circulation area and the material regulating storage area. It can be understood that the upper ends of the first regulating storage partition door 10 and the second regulating storage partition door 11 are connected to the side wall of the furnace, wherein the connection can be a hinge connection, allowing the first regulating storage partition door 10 and the second regulating storage partition door 11 to be inserted into or pulled out of the furnace. Other movable connection methods are also possible and are not specifically limited here. Both ends of the first regulating storage partition door 10 and the second regulating storage partition door 11 are freely movable ends.

[0075] In this embodiment of the invention, the specific process of using a driving device to drive the regulating storage bin partition door to open and close along the horizontal plane where the regulating storage bin partition door is located, either upwards or downwards, to control the size of the connected area between the main material circulation area and the material regulating storage bin area is as follows:

[0076] like Figure 1As shown, the first driving device 8 drives the first regulating storage compartment partition door 10 downwards along its horizontal plane (i.e., into the furnace), reducing the connection area between the first material regulating storage compartment 12 and the main material circulation compartment, thereby reducing the transfer of heat-storing material in the first material regulating storage compartment 12, until the first regulating storage compartment partition door 10 contacts the primary air distribution plate 5 at the bottom of the furnace. At this point, the first material regulating storage compartment 12 is completely closed. Similarly, the second driving device 9 drives the second regulating storage compartment partition door 11 downwards along its horizontal plane (i.e., into the furnace), thereby reducing the connection area between the second material regulating storage compartment 13 and the main material circulation compartment, reducing the transfer of heat-storing material in the second material regulating storage compartment 13, until the second regulating storage compartment partition door 11 contacts the primary air distribution plate 5 at the bottom of the furnace. At this point, the second material regulating storage compartment 13 is completely closed.

[0077] Figure 2 With Figure 1 The only difference between the two structures is that when the drive unit opens the regulating storage bin partition door upwards along the horizontal plane where the regulating storage bin partition door is located, the connecting area between the main material circulation area and the material regulating storage bin area is expanded.

[0078] Specifically, it manifests as follows: Figure 2 As shown, the first driving device 8 drives the first regulating storage compartment partition door 10 upwards (towards the outside of the furnace) along the horizontal surface of the first regulating storage compartment partition door 10, thereby expanding the communication area between the main material circulation area and the first material regulating storage compartment 12, increasing the transfer of heat-storing material in the first material regulating storage compartment 12, until the lower end of the first regulating storage compartment partition door 10 completely leaves the furnace interior, at which point the first material regulating storage compartment 12 is in a fully open state. Similarly, the second driving device 9 can also drive the second regulating storage compartment partition door 11 upwards (towards the outside of the furnace) along the horizontal surface of the second regulating storage compartment partition door 11, thereby expanding the communication area between the main material circulation area and the second material regulating storage compartment 13, thereby increasing the transfer of heat-storing material in the second material regulating storage compartment 13, until the lower end of the second regulating storage compartment partition door 11 completely leaves the furnace interior, at which point the second material regulating storage compartment 13 is in a fully open state. Wherein, as... Figure 2 As shown, the direction of upward movement along the horizontal plane where the regulating storage compartment partition door is located is the direction in which the regulating partition door moves towards the outside of the furnace.

[0079] Figure 3 A schematic diagram of the structure of a circulating fluidized bed boiler with the regulating storage compartment partition door completely closed, according to another embodiment of the present invention.

[0080] According to an embodiment of the present invention, Figure 3 With Figure 1The structural units are identical, with the only difference being that the center of the regulating storage partition door has at least one bend, the upper end of the regulating storage partition door is hinged to the inner wall of the furnace, and the lower end of the regulating storage partition door is a free-moving end; at least one of the lower left and right ends of the regulating storage partition door is connected to a drive device, so that the drive device can drive the lower end of the regulating storage partition door to close downward along the horizontal plane where the upper end of the regulating storage partition door is located, with the bend point of the regulating storage partition door as the axis.

[0081] Specifically, it manifests as follows: Figure 3 As shown, the upper ends of the first regulating storage compartment partition door 10 and the second regulating storage compartment partition door 11 are respectively hinged to the inner wall of the furnace. The center of the first regulating storage compartment partition door 10 and the second regulating storage compartment partition door 11 has a turning point. The lower ends of the first regulating storage compartment partition door 10 and the second regulating storage compartment partition door 11 are free movable ends. At least one of the lower ends of the first regulating storage compartment partition door 10 is connected to the first driving device 8. The first driving device 8 drives the lower end of the first regulating storage compartment partition door 10 to close (extend) downward along the horizontal plane where the upper end of the first regulating storage compartment partition door 10 is located, with the inflection point of the first regulating storage compartment partition door 10 as the axis. This controls the connection area between the first material regulating storage compartment area 12 and the main material circulation area to gradually decrease, reducing the transfer of heat storage material in the first material regulating storage compartment area 12, until the included angle between the upper end and the lower end of the first regulating storage compartment partition door 10 is 180°, and the lower end of the first regulating storage compartment partition door 10 contacts the primary air distribution plate 5. Similarly, at least one of the lower ends of the second regulating storage partition door 11 is connected to the second driving device 9. The second driving device 9 drives the lower end of the second regulating storage partition door 11 to close (extend) downwards along the horizontal plane where the upper end of the second regulating storage partition door 11 is located, with the inflection point of the second regulating storage partition door 11 as the axis. This controls the gradual reduction of the connecting area between the second material regulating storage area 13 and the main material circulation area, reducing the transfer of materials in the second material regulating storage area 13, until the angle between the upper end and the lower end of the second regulating storage partition door 11 is 180°, and the lower end of the second regulating storage partition door 11 contacts the primary air distribution plate 5. The downward movement along the horizontal plane where the upper end of the regulating storage partition door is located refers to the movement of the free movable end of the lower end of the regulating storage partition door towards the bottom of the furnace, with the inflection point on the regulating storage partition door as the axis. Figure 3The adjustable storage compartment partition door with folding function shown can be housed on one side of the furnace wall through a two-section design. It should be noted that the adjustable storage compartment partition door is not limited to a two-section fold; it can also be a three-section, four-section, etc. The specific number of folding sections of the adjustable storage compartment partition door can be determined according to the boiler furnace diameter and the internal layout space, but the distance between each folding section is equal. Correspondingly, the adjustable storage compartment partition door is not limited to one folding point; it can have two, three, etc. The upper end of the adjustable storage compartment partition door is movably connected to the inner wall of the furnace, and the movable connection method includes hinges. The folding sections at both ends of the folding point of the adjustable storage compartment partition door can be connected by a movable connection, which can also be a hinge. The connection method between at least one of the lower left and right ends of the adjustable storage compartment partition door and the drive device is not limited to a hinged connection.

[0082] According to embodiments of the present invention, the upper end of the regulating storage partition door can be hinged to the inner wall of the furnace, and the lower end of the regulating storage partition door can be a freely movable end. A driving device can be used to drive the regulating storage partition door to swing within a range of 0-45° around its upper end. Furthermore, a driving device can also be used to drive the regulating storage partition door to swing within a range of 0-30° around its upper end. For example, the upper end of the first regulating storage partition door 10 can be hinged to the inner wall of the furnace, and the lower end of the first regulating storage partition door 10 can be a freely movable end. A first driving device 8 can be used to drive the first regulating storage partition door 10 to swing within a range of 0-45° around its upper end. Here, 0-45° refers to the angle between the upper end of the first regulating storage partition door 10 and the inner wall of the furnace. Similarly, the second regulating storage partition door 11 can also perform the same movement, which will not be described further here.

[0083] Figure 4 A schematic diagram of the structure of a circulating fluidized bed boiler with the regulating storage compartment partition door fully open, according to another embodiment of the present invention.

[0084] Figure 4 With Figure 3 The same structural unit, the only difference is that the lower end of the adjustable storage compartment partition door is driven by a drive device to open upward along the horizontal plane where the upper end of the adjustable storage compartment partition door is located, with the inflection point of the adjustable storage compartment partition door as the axis.

[0085] Specifically, it manifests as follows: Figure 4As shown, the upper ends of the first regulating storage partition door 10 and the second regulating storage partition door 11 are respectively hinged to the inner wall of the furnace. The center of the first regulating storage partition door 10 and the second regulating storage partition door 11 each has a turning point. The lower ends of the first regulating storage partition door 10 and the second regulating storage partition door 11 are free movable ends. At least one of the lower ends of the left and right sides of the first regulating storage partition door 10 is connected to the first driving device 8, so that the first driving device 8 can drive the lower end of the first regulating storage partition door 10 to open (contract) upward along the horizontal plane where the upper end of the first regulating storage partition door 10 is located, with the turning point of the first regulating storage partition door 10 as the axis. This controls the increase of the communication area between the first material regulating storage area 12 and the main material circulation area, increasing the transfer of heat storage material in the first material regulating storage area 12, until the upper end and the lower end of the first regulating storage partition door 10 are nearly overlapped. Similarly, at least one of the lower ends of the left and right sides of the second regulating storage partition door 11 is connected to the second driving device 9. The second driving device 9 drives the lower end of the second regulating storage partition door 11 to open (close) upwards along the horizontal plane where the upper end of the second regulating storage partition door 11 is located, with the inflection point of the second regulating storage partition door 11 as the axis. This controls the gradual increase of the connecting area between the second material regulating storage area 13 and the main material circulation area, increasing the transfer of material in the second material regulating storage area 13 until the upper end and the lower end of the second regulating storage partition door 11 are nearly aligned. For example, Figure 4 As shown, the movement upward along the horizontal plane where the upper end of the regulating storage compartment partition door is located is the movement of the free movable end of the lower end of the regulating storage compartment partition door with the inflection point on the regulating storage compartment partition door as the axis, and the movement in the direction of contraction of the upper end of the regulating storage compartment partition door.

[0086] According to an embodiment of the present invention, the first regulating storage compartment partition door 10 and the second regulating storage compartment partition door 11 are independently controlled and operated within the furnace and are symmetrically arranged on both sides of the furnace.

[0087] According to an embodiment of the present invention, the furnace 1 is used for fuel and oxidant to fluidize and burn within the furnace to obtain a heat storage material, wherein the heat storage includes fuel particles and unburned fuel particles within the furnace. Figures 1-4 As shown, the top of the furnace 1 is provided with a gas-solid product outlet. Some of the heat storage materials inside the furnace 1 are discharged through the gas-solid product outlet, and some of the heat storage materials are circulated in the lower part of the furnace, such as the heat storage materials being transferred between the main material circulation area and the material conditioning storage area.

[0088] According to embodiments of the present invention, such as Figures 1-4As shown, separator 2 is used to separate gas-solid products to obtain heat storage material. Separator 2 is connected to the gas-solid product outlet. After separation, the waste gas in the gas-solid products, such as carbon dioxide or nitrogen oxides in the gas-solid products, is discharged through the tail flue 4. Separator 2 can be a cyclone separator.

[0089] The return feeder 3 is used to return the heat storage material to the furnace 1. Specifically, the outlet of the separator 2 is connected to the inlet of the return feeder 3. The heat storage material separated by the separator 2 is discharged through the outlet of the separator 2 and flows into the return feeder 3. The return feeder 3 is connected to the furnace 1 through the return leg to return the heat storage material to the furnace 1. The lower part of the furnace is used to receive and store the heat storage material returned by the return feeder 2.

[0090] According to an embodiment of the present invention, the material conditioning storage area does not include a heated surface, and the inner wall of the material conditioning storage area is lined with a heat-insulating, wear-resistant, and fire-resistant material; the partition door of the conditioning storage area is made of fire-resistant and wear-resistant material.

[0091] In embodiments of the present invention, no heating surface is provided in the material conditioning and storage area, meaning there is no heat exchange between the material conditioning and storage area and the furnace, resulting in minimal heat loss. Simultaneously, the inner wall of the material conditioning and storage area is insulated to prevent the high-temperature stored material from cooling down upon entering the material conditioning and storage area, which would affect the subsequent return of stored material to the furnace, thus lowering the furnace temperature and consequently impacting the efficiency of the combustion reaction and reducing the furnace's heat load. Both the material conditioning and storage area and its partition doors are made of wear-resistant and refractory materials, reducing wear from the stored material and protecting them from the effects of high furnace temperatures, thereby extending their service life.

[0092] Based on the above-described circulating fluidized bed boiler, another aspect of the present invention provides a method for variable load regulation using a circulating fluidized bed boiler, the method comprising:

[0093] During the load reduction adjustment stage of the circulating fluidized bed boiler, the drive device drives the regulating storage silo door to move upward along the horizontal plane where the regulating storage silo door is located, so that the connection area between the main material circulation area and the material regulating storage area is expanded, and some of the heat storage material in the lower part of the furnace is transported to the material regulating storage area for storage, so as to reduce the load of the circulating fluidized bed boiler.

[0094] When the load of the circulating fluidized bed boiler is reduced to the predetermined load condition, the drive device is used to drive the regulating storage silo door to close downward along the horizontal plane where the regulating storage silo door is located, so that the connection area between the main material circulation area and the material regulating storage area is gradually reduced to the closed state.

[0095] In an embodiment of the present invention, the storage compartment partition door is controlled by a drive device to open and close along the horizontal plane where the storage compartment partition door is located, either upward or downward, thereby realizing the circulation of heat storage material between the furnace and the material regulating storage compartment area, and controlling the size of the connecting area between the material regulating storage compartment area and the main material circulation area, thereby realizing the load regulation of the boiler, and the load regulation response speed is relatively fast.

[0096] According to an embodiment of the present invention, driving the adjustable storage compartment partition door to open and close along the horizontal plane where the adjustable storage compartment partition door is located (either upwards or downwards) using a driving device includes:

[0097] The single-sided adjustable storage compartment partition door is opened or closed by using a drive device to move it upwards or downwards along the horizontal plane where the adjustable storage compartment partition door is located; or

[0098] The double-sided adjustable storage compartment partition doors are opened or closed by using a drive device to move the horizontal plane of the adjustable storage compartment partition doors upward or downward.

[0099] Specifically, refer to Figure 1 The driving device includes a first driving device 8 and a second driving device 9. The first driving device 8 and the second driving device 9 are used to drive the first adjusting storage compartment partition door 10 and the second adjusting storage compartment partition door 11 to open or close along the horizontal plane where the first adjusting storage compartment partition door 10 and the second adjusting storage compartment partition door 11 are located, or to open or close along the horizontal plane where the first adjusting storage compartment partition door 10 and the second adjusting storage compartment partition door 11 are located, thereby controlling the size of the connection area between the first material adjusting storage compartment area 12 and the second material adjusting storage compartment area 13 corresponding to the first adjusting storage compartment partition door 10 and the second adjusting storage compartment partition door 11 and the main material circulation. For example, the first driving device 8 drives the first regulating storage compartment partition door 10 to open or close along the horizontal plane of the first regulating storage compartment partition door 10, either upwards or downwards, thereby controlling the decrease or increase of the heat load in the furnace. Based on this, the second driving device 9 drives the second regulating storage compartment partition door 11 to open or close along the horizontal plane of the second regulating storage compartment partition door 11, either upwards or downwards, thereby further controlling the decrease or increase of the heat load in the furnace. Alternatively, the first driving device 8 can drive the first regulating storage compartment partition door 10 to open or close along the horizontal plane of the first regulating storage compartment partition door 10; simultaneously, the second driving device 9 can also drive the second regulating storage compartment partition door 11 to open or close along the horizontal plane of the second regulating storage compartment partition door 11, thereby achieving load regulation within the furnace.

[0100] It should be noted that the order in which the first driving device and the second driving device operate in the embodiments of the present invention does not constitute a limitation on the scope of protection sought by the present invention. The existing order listed in the present invention is only for illustrative purposes.

[0101] According to an embodiment of the present invention, the primary air distribution plate 5 and the regulating storage air distribution plate can operate simultaneously or independently, wherein the regulating storage air distribution plate includes a first storage air distribution plate 6 and a second storage air distribution plate 7. The first storage air distribution plate 6 and the second storage air distribution plate 7 can operate independently or simultaneously, and can be flexibly adjusted according to the needs of the circulating fluidized bed boiler operating conditions.

[0102] According to an embodiment of the present invention, the velocities of the primary air from the primary air distribution plate 5 and the fluidizing air from the regulating storage air distribution plate are determined by the ratio of their distribution areas. Since both the primary air distribution plate 5 and the regulating storage air distribution plate have multiple air caps evenly distributed on them, the velocities of the primary air from the primary air distribution plate 5 and the fluidizing air from the regulating storage air distribution plate can be controlled by adjusting the working area of ​​the air caps. The regulating storage air distribution plate includes a first regulating storage air distribution plate 6 and a second regulating storage air distribution plate 7.

[0103] According to an embodiment of the present invention, the primary air distribution of the primary air distribution plate 5 and / or the fluidizing air speed of the storage air distribution plate are controlled so that part of the heat storage in the lower part of the furnace can circulate in the circulating fluidized bed boiler.

[0104] Specifically, during the operation of the circulating fluidized bed boiler, the primary air distribution velocity of the primary air distribution plate 5 can control the re-combustion of some of the heat-storage materials in the lower part of the furnace. When the circulating fluidized bed boiler needs to reduce its heat load, the working area of ​​the air caps on the first regulating storage air distribution plate 6 and / or the second regulating storage air distribution plate 7 is reduced, thereby reducing the amount of heat-storage materials in the first material regulating storage area 12 and / or the second material regulating storage area 13 that the fluidizing air returns to the furnace, thus increasing the heat load in the furnace. When the circulating fluidized bed boiler needs to increase its heat load, the working area of ​​the air caps on the first regulating storage air distribution plate 6 and / or the second regulating storage air distribution plate 7 is increased, thereby increasing the amount of heat-storage materials in the first material regulating storage area 12 and / or the second material regulating storage area 13 that the fluidizing air returns to the furnace to participate in the heat load, thus increasing the heat load in the furnace.

[0105] According to an embodiment of the present invention, before the load reduction and adjustment stage of the circulating fluidized bed boiler, the specific process of material circulation within the circulating fluidized bed boiler is as follows:

[0106] Fuel pellets and oxidant are fed into a circulating fluidized bed boiler. After fluidization and combustion, heat storage material is obtained. The heat storage material discharged through the gas-solid product outlet enters the separator 2 for gas-solid separation, resulting in heat storage material and waste gas. The waste gas in the separated gas-solid products is discharged through the flue, and the heat storage material is conveyed to the return feeder 3 through the separator outlet. The heat storage material that arrives at the return feeder 3 is returned to the furnace 1 through the return leg. The furnace 1 is used to receive and store the heat storage material.

[0107] Under actual deep peak-shaving operation conditions, the load reduction adjustment stage of the circulating fluidized bed boiler includes a first load reduction stage and a second load reduction stage. The first load reduction stage is the stage where the boiler reduces its load from the rated load to a predetermined load, and the second load reduction stage is the stage where the boiler reduces its load from the predetermined load to an ultra-low load stage. In this invention, the rated load can be 100% of the rated load or the rated load during boiler operation. The predetermined load is a pre-set load, not limited to 30%, and the ultra-low load is 20% or less.

[0108] In this embodiment of the invention, the specific method for load reduction regulation of a circulating fluidized bed boiler is as follows:

[0109] 1. In the first load reduction adjustment stage of the circulating fluidized bed boiler, where the rated load is reduced from 100% to 30%, in the aforementioned... Figure 1 In the arrangement of a circulating fluidized bed boiler, the first driving device 8 drives the first regulating storage compartment partition door 10 to open upwards along the horizontal plane where the first regulating storage compartment partition door 10 is located. This expands the communication area between the main material circulation zone and the first material regulating storage compartment 12, allowing some of the heat storage material in the lower part of the furnace to be transported to the first material regulating storage compartment 12 for storage, thereby reducing the heat load of the circulating fluidized bed boiler. At this time, the working area of ​​the air cap on the first storage compartment air distribution plate 6 gradually decreases. The heat storage material in the lower part of the furnace includes the heat storage material in the area between the main material circulation zone and the second material regulating storage compartment 13, and the heat storage material includes fuel particles and unburned fuel particles.

[0110] When the heat load of the circulating fluidized bed boiler is reduced to 30% of its operating load, the first drive device 8 drives the first regulating storage compartment partition door 10 to close downwards along the horizontal plane where the first regulating storage compartment partition door 10 is located, so that the connection area between the main material circulation area and the first material regulating storage compartment 12 gradually decreases until it is closed. During this load reduction adjustment process, the area of ​​the air cap on the first storage compartment air distribution plate 6 is gradually reduced. When the connection area between the main material circulation area and the first material regulating storage compartment 12 is closed, the first storage compartment air distribution plate 6 at the bottom of the first material regulating storage compartment 12 is closed. The primary air distribution plate 5 and the second storage compartment air distribution plate 7 in the furnace are retained to maintain the normal operation of the circulating fluidized bed boiler at the predetermined load of 30%.

[0111] 2. In the second load reduction adjustment stage of the circulating fluidized bed boiler, where the predetermined load is reduced from 30% to ultra-low load (20% or below), in the aforementioned... Figure 1 In the arrangement of the circulating fluidized bed boiler, the first regulating storage partition door 10 has been moved downward along the horizontal plane of the first regulating storage partition door 10 to the closed state by the first driving device 8. Then, the second regulating storage partition door 11 is driven upward along the horizontal plane of the second regulating storage partition door 11 by the second driving device 9. This expands the communication area between the main material circulation area and the second material regulating storage area 13, allowing some of the heat storage material in the lower part of the furnace to be transported to the second material regulating storage area 13 for storage, thereby further reducing the heat load of the circulating fluidized bed boiler. At this time, the working area of ​​the air cap on the second storage air distribution plate 7 gradually decreases.

[0112] When the heat load of the circulating fluidized bed boiler decreases from 30% of the predetermined load to 20% or lower, the second drive device 9 drives the second regulating storage compartment partition door 11 to close downwards along the horizontal plane where the second regulating storage compartment partition door 11 is located, so that the communication area between the main material circulation zone and the second material regulating storage compartment 13 gradually decreases until it is closed. At this time, the second storage compartment air distribution plate 7 at the bottom of the second material regulating storage compartment 13 is closed, while the primary air distribution plate 5 in the furnace is retained to maintain the normal operation of the circulating fluidized bed boiler at 20% or lower load.

[0113] In an embodiment of the present invention, a specific method for reducing load regulation using a circulating fluidized bed boiler is also provided:

[0114] 1. In the first load reduction adjustment stage of the circulating fluidized bed boiler, where the rated load is reduced from 100% to 30%, in the aforementioned... Figure 3 In the arrangement of the circulating fluidized bed boiler, at least one of the lower ends of the left and right sides of the first regulating storage partition door 10 is connected to the first driving device 8. The first driving device 8 drives the lower end of the first regulating storage partition door 10 to open (contract) upward along the horizontal plane where the upper end of the first regulating storage partition door 10 is located, with the inflection point of the first regulating storage partition door 10 as the axis. This expands the communication area between the main material circulation area and the first material regulating storage area 12, allowing some of the heat storage material in the lower part of the furnace to be transported to the first material regulating storage area 12 for storage, thereby reducing the heat load of the circulating fluidized bed boiler. During the load reduction process, the air caps on the air distribution plate 6 of the first regulating storage gradually stop working.

[0115] When the heat load of the circulating fluidized bed boiler is reduced to 30% load, the first drive device 8 drives the lower end of the first regulating storage partition door 10 to close (extend) downwards along the horizontal plane where the upper end of the first regulating storage partition door 10 is located, with the inflection point of the first regulating storage partition door 10 as the axis. This gradually reduces the connection area between the main material circulation area and the first material regulating storage area 12 until it is closed. During this load reduction adjustment process, the working area of ​​the air cap on the first storage air distribution plate 6 is gradually reduced. When the connection area between the main material circulation area and the first material regulating storage area 12 is closed, the first storage air distribution plate 6 at the bottom of the first material regulating storage area 12 is closed. The primary air distribution plate 5 and the second storage air distribution plate 7 in the furnace are retained to maintain the normal operation of the circulating fluidized bed boiler at the predetermined load of 30%.

[0116] 2. In the second load reduction adjustment stage of the circulating fluidized bed boiler, which reduces the predetermined load from 30% to ultra-low load (20% or below), that is, based on the closed state of the connection area between the main material circulation area and the first material regulating storage area 12, at least one of the lower ends of the left and right sides of the second regulating storage partition door 11 is connected to the second drive device 9. The second drive device 9 drives the lower end of the second regulating storage partition door 11 to open (contract) upward along the horizontal plane where the upper end of the second regulating storage partition door 11 is located, with the inflection point of the second regulating storage partition door 11 as the axis. After the connection area between the main material circulation area and the second material regulating storage area 13 is expanded, part of the heat storage material in the lower part of the furnace is transported to the second material regulating storage area 13 for storage, so as to further reduce the heat load of the circulating fluidized bed boiler. At this time, the working area of ​​the wind cap on the second storage air distribution plate 7 gradually decreases.

[0117] When the heat load of the circulating fluidized bed boiler decreases from 30% of the predetermined load to 20% or below, the lower end of the second regulating storage partition door 11 is driven by the second drive device 9 to close (extend) downward along the horizontal plane where the upper end of the second regulating storage partition door 11 is located, with the inflection point of the second regulating storage partition door 11 as the axis. This gradually reduces the connecting area between the main material circulation area and the second material regulating storage area 13 until it is closed. Figure 3 (As shown in the diagram). At this time, the second storage air distribution plate 7 at the bottom of the second material regulating storage area 13 is in the closed state, while the primary air distribution plate 5 in the furnace is retained to maintain the normal operation of the circulating fluidized bed boiler at 20% or less of the load.

[0118] In this embodiment of the invention, the specific method for adjusting the load using a circulating fluidized bed boiler is as follows:

[0119] 1. During the first load adjustment phase of a circulating fluidized bed boiler from an ultra-low load of 20% or below to a predetermined load of 30%, if... Figure 2 In the circulating fluidized bed boiler arrangement shown, the first regulating storage compartment partition door 10 is driven upwards along the horizontal plane where the first regulating storage compartment partition door 10 is located by the first driving device 8. This expands the communication area between the main material circulation zone and the first material regulating storage compartment 12, allowing the heat storage material stored in the first material regulating storage compartment 12 during the load reduction phase to return to the main material circulation zone through the fluidizing air of the regulating storage compartment air distribution plate. This forms a combustion zone combining the main material circulation zone and the material regulating storage compartment, thereby increasing the load in the furnace. By adjusting the speed of the fluidizing air of the first regulating storage compartment air distribution plate 6, the heat storage material in the material regulating storage compartment participates in the material circulation of the main material circulation zone, thereby increasing the heat load in the circulating fluidized bed boiler. At the same time, the primary air distribution plate 5 in the furnace operates normally.

[0120] 2. During the second load adjustment stage of the circulating fluidized bed boiler, when the heat load is increased from 30% of the predetermined load to 100% of the rated load, in Figure 2 In the arrangement of the circulating fluidized bed boiler, the second regulating storage compartment partition door 11 is driven upward along the horizontal plane where the second regulating storage compartment partition door 11 is located by the second drive device 9. This expands the communication area between the main material circulation area and the first material regulating storage compartment 13, allowing the heat storage material stored in the second material regulating storage compartment 13 during the load reduction stage to be returned to the main material circulation area through the fluidizing air of the regulating storage compartment air distribution plate 6. This forms a combustion area combining the main material circulation area and the first material regulating storage compartment area, thereby increasing the load in the furnace. The speed of the fluidizing air of the second regulating storage compartment air distribution plate 7 is adjusted to increase the heat load in the circulating fluidized bed boiler. At this time, the primary air distribution plate 5, the first regulating storage compartment air distribution plate 6, and the second regulating storage compartment air distribution plate 7 in the furnace are all operating normally, and both the first regulating storage compartment partition door 10 and the second regulating storage compartment partition door 10 are outside the furnace.

[0121] In this embodiment of the invention, a specific method for adjusting the load using a circulating fluidized bed boiler is also provided:

[0122] 1. During the first load adjustment phase of a circulating fluidized bed boiler from an ultra-low load of 20% or below to a predetermined load of 30%, if... Figure 4In the circulating fluidized bed boiler arrangement shown, at least one of the lower ends of the left and right sides of the first regulating storage partition door 10 is connected to the first driving device 8. The first driving device 8 drives the lower end of the first regulating storage partition door 10 to contract upwards along the horizontal plane where the upper end of the first regulating storage partition door 10 is located, with the inflection point of the first regulating storage partition door 10 as the axis. This expands the connecting area between the main material circulation zone and the first material regulating storage zone 12, allowing the heat-storing material stored in the first material regulating storage zone 12 during the load reduction phase to return to the main material circulation zone via the fluidizing air from the first regulating storage air distribution plate 6. This forms a combustion zone combining the main material circulation zone and the first material regulating storage zone 12, thereby increasing the load within the furnace. By adjusting the speed of the fluidizing air from the first regulating storage air distribution plate 6, the heat-storing material in the first material regulating storage zone 12 participates in the material circulation of the main material circulation zone, further increasing the heat load within the circulating fluidized bed boiler. Simultaneously, the primary air distribution plate 5 within the furnace operates normally.

[0123] 2. In the second load adjustment stage of the circulating fluidized bed boiler, where the heat load is increased from 30% of the predetermined load to 100% of the rated load, based on the complete connection between the first material adjustment storage area 12 and the main material circulation area, at least one of the lower ends of the left and right sides of the second adjustment storage partition door 11 is connected to the second drive device 9. The second drive device 9 drives the lower end of the second adjustment storage partition door 11 to open (contract) upward along the horizontal plane where the upper end of the second adjustment storage partition door 11 is located, with the inflection point of the second adjustment storage partition door 11 as the axis. This expands the communication area between the main material circulation area and the second material adjustment storage area 13, allowing the heat storage material stored in the second material adjustment storage area 13 during the load reduction stage to return to the main material circulation area through the fluidizing air of the second adjustment storage air distribution plate 7. This forms a combustion area combining the main material circulation area and the second material adjustment storage area 13, thereby increasing the load in the furnace. The heat load in the circulating fluidized bed boiler is increased by adjusting the speed of the fluidizing air of the second adjustment storage air distribution plate 7. At this time, the primary air distribution plate 5, the first regulating storage air distribution plate 6, and the second regulating storage air distribution plate 7 in the furnace are all operating normally, and the first regulating storage partition door 10 and the second regulating storage partition door 10 are in a fully retracted state.

[0124] In an embodiment of the present invention, during the load increase stage, the drive device drives the regulating storage bin partition door to retract or extend along the horizontal plane where the regulating storage bin partition door is located, returning the heat storage material stored in the material regulating storage bin area to the furnace for another heat circulation. Since the material regulating storage bin area has a good heat preservation effect, the heat storage material entering the furnace can maintain its original temperature, thereby increasing the temperature inside the furnace and realizing rapid adjustment and response of the load increase in the furnace. This solves the problem that existing furnaces cannot quickly and effectively adjust the load.

[0125] Another aspect of the present invention provides a solid material processing apparatus, including a circulating fluidized bed boiler. The structure of the circulating fluidized bed boiler is as described in the above embodiments and will not be repeated here. The technical solution of the circulating fluidized bed boiler provided by the present invention can also be applied to the low-temperature drying of solid fuels or to the heat treatment of solid materials, wherein the temperature range for low-temperature drying is below 250°C.

[0126] In the embodiments of the present invention, the space occupied by the drive device, the regulating storage compartment partition door, the material regulating storage compartment area, and the regulating storage compartment air distribution plate, etc., is relatively small. Through reasonable arrangement and control of the operation process, the amount of heat storage material inside the furnace can be adjusted, thereby reducing or increasing the load inside the boiler. At the same time, it avoids the need to maintain a high primary air volume to ensure a good fluidization state of the heat storage material under low load (below 30%). It also has the advantages of maintaining good efficiency and low nitrogen emissions of circulating fluidized bed boilers.

[0127] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A circulating fluidized bed boiler, comprising: The furnace chamber, the lower part of which includes an adjacent material main circulation area and a material regulating and storage area; A primary air distribution plate is installed at the bottom of the main material circulation zone to introduce primary air into the main material circulation zone; An adjustable air distribution plate is installed at the bottom of the material regulating storage area to introduce fluidizing air into the material regulating storage area; An adjustable storage compartment partition door is provided, which is connected to the side wall of the furnace. The adjustable storage compartment partition door divides the lower part of the furnace into the main material circulation area and the material adjusting storage compartment area. At least one end of the adjustable storage compartment partition door is a free movable end, and the adjustable storage compartment partition door is connected to the furnace by a hinge. A driving device is used to drive the regulating storage compartment partition door to open and close along the horizontal plane where the regulating storage compartment partition door is located, such that when the regulating storage compartment partition door is opened along the horizontal plane where the regulating storage compartment partition door is located, the communication area between the main material circulation area and the material regulating storage compartment area expands, and when the regulating storage compartment partition door is closed along the horizontal plane where the regulating storage compartment partition door is located, the communication area between the main material circulation area and the material regulating storage compartment area shrinks. The adjustable storage compartment partition door has a bend at its center, the upper end of the adjustable storage compartment partition door is hinged to the inner wall of the furnace, and the lower end of the adjustable storage compartment partition door is a free-moving end. At least one of the lower left and right ends of the adjustable storage compartment partition door is connected to a drive device, so that the lower end of the adjustable storage compartment partition door is driven by the drive device to open and close about the inflection point of the adjustable storage compartment partition door, either upward or downward along the horizontal plane where the upper end of the adjustable storage compartment partition door is located.

2. The circulating fluidized bed boiler according to claim 1, wherein: The driving device is used to drive at least one end of the regulating storage compartment partition door to open and close along the horizontal plane where the regulating storage compartment partition door is located, either upward or downward, to facilitate the transfer of heat-storing materials between the main material circulation area and the material regulating storage compartment area.

3. The circulating fluidized bed boiler according to claim 1, wherein: The furnace is used for the fluidization and combustion of fuel particles and oxidant to obtain heat storage material. A gas-solid product outlet is provided at the top of the furnace. Part of the heat storage material is discharged through the gas-solid product outlet, and part of the heat storage material circulates within the furnace. The heat storage material includes fuel particles and unburned fuel particles within the furnace. The circulating fluidized bed boiler also includes: A separator is used to separate the gas-solid products to obtain heat storage material. The separator is connected to the outlet of the gas-solid products, and the waste gas in the separated gas-solid products is discharged through the tail flue. A return feeder is used to return the heat storage material to the furnace. The return feeder is connected to the outlet of the separator and to the furnace via a return feed leg. The lower part of the furnace is used to receive and store the heat storage material.

4. The circulating fluidized bed boiler according to claim 1, wherein: The material conditioning and storage area does not include a heated surface, and the inner wall of the material conditioning and storage area is lined with heat-insulating, wear-resistant and fire-resistant material. The adjustable storage compartment partition door is made of fire-resistant and wear-resistant material.

5. A method for variable load regulation using a circulating fluidized bed boiler according to any one of claims 1-4, comprising: During the load reduction adjustment stage of the circulating fluidized bed boiler, the adjustment storage silo partition door is driven to open upward along the horizontal plane where the adjustment storage silo partition door is located by the drive device, so that the connection area between the main material circulation area and the material adjustment storage area is expanded, and some of the heat storage material in the lower part of the furnace is transported to the material adjustment storage area for storage, so as to reduce the load of the circulating fluidized bed boiler. When the load of the circulating fluidized bed boiler is reduced to the predetermined load condition, the driving device is used to drive the regulating storage silo partition door to close downward along the horizontal plane where the regulating storage silo partition door is located, so that the connection area between the main material circulation area and the material regulating storage area is gradually reduced to the closed state.

6. The method for variable load regulation of a circulating fluidized bed boiler according to claim 5, wherein, Using a drive device to drive the adjustable storage compartment partition door to open and close along the horizontal plane where the adjustable storage compartment partition door is located, either upwards or downwards, includes: The driving device is used to drive one side of the adjustable storage compartment partition door to open or close along the horizontal plane where the adjustable storage compartment partition door is located, either upwards or downwards; or The adjustable storage compartment partition doors on both sides are opened or closed by using a drive device to move them upward or downward along the horizontal plane where the adjustable storage compartment partition doors are located.

7. The method for variable load regulation of a circulating fluidized bed boiler according to claim 5, wherein: The primary air distribution panel and the regulating storage air distribution panel can operate simultaneously or independently; The velocity of the primary air of the primary air distribution plate and the fluidizing air of the regulating storage air distribution plate are determined by the ratio of the air distribution area of ​​the primary air distribution plate and the regulating storage air distribution plate.

8. The method for variable load regulation of a circulating fluidized bed boiler according to claim 7, wherein: Control the primary air distribution of the primary air distribution plate and / or adjust the fluidizing air speed of the storage air distribution plate so that some of the heat storage material in the lower part of the furnace can circulate in the circulating fluidized bed boiler.

9. The method for variable load regulation of a circulating fluidized bed boiler according to claim 5 further includes: During the load increase adjustment stage of the circulating fluidized bed boiler, the adjustment storage silo partition door is driven to open upward along the horizontal plane where the adjustment storage silo partition door is located by the drive device, so as to expand the communication area between the main material circulation area and the material adjustment storage area, so that the heat storage material stored in the material adjustment storage silo during the load decrease adjustment stage can be returned to the main material circulation area through the fluidizing air of the adjustment storage silo air distribution plate, and a combustion area combining the main material circulation area and the material adjustment storage area can be formed to increase the load in the furnace. By adjusting the speed of the fluidizing air from the air distribution plate in the regulating storage silo, the heat storage material in the regulating storage area can participate in the material circulation in the main material circulation area, thereby improving the response rate of the heat load in the circulating fluidized bed boiler.

10. A solid material handling apparatus comprising a circulating fluidized bed boiler according to any one of claims 1-4.

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