Modular circulating fluidized bed boiler gas-solids separation device and multi-pass circulating bed boiler

Abstract

The application discloses a modular circulating fluidized bed boiler gas-solid separation device and a multi-flow circulating bed boiler, wherein the gas-solid separation device comprises a gas-solid separator module, an air inlet is arranged on the side wall of the upper portion of the gas-solid separator module, the gas-solid separator module comprises two gas-solid separators which are connected with the air inlet and are in parallel and communicated, a flow guide triangle is arranged on the side of the gas-solid separator module which is far away from the air inlet, the flow guide triangle comprises a first inclined surface and a second inclined surface, a center cylinder module comprises two center cylinders, one center cylinder is arranged on the top of each gas-solid separator, and the center cylinder is detachably and sealingly connected with the top of the gas-solid separator. According to the application, two parallel and communicated gas-solid separators are arranged at one air inlet, the solid-gas separation efficiency of the gas-solid separation device is improved, and the high-temperature gas entering the tail flue is more pure. In addition, the on-site installation, disassembly and replacement are facilitated.

Description

Technical Field

[0001] This invention relates to the field of multi-process circulating bed boilers, and more specifically, to a modular circulating fluidized bed boiler gas-solid separation device and a multi-process circulating bed boiler. Background Technology

[0002] Multi-process circulating fluidized bed (CFB) technology is a highly efficient and clean combustion technology with wide fuel adaptability, capable of burning high-quality coal, low-quality coal, solid waste, biomass, and other fuels. Existing CFB boilers are generally small to medium-sized boilers, mainly used in industrial and civil applications, typically with a capacity of 10-75 t / h. However, the separation efficiency of existing CFB boiler separators is relatively low, resulting in the high-temperature gas after separation still containing a large amount of ash and some unburned fuel. This lighter unburned fuel and ash enter the tail flue with the high-temperature gas, not only wasting fuel but also causing wear and tear on the equipment in the tail flue, shortening its service life, and causing ash accumulation on the heating surfaces of the tail shaft. Furthermore, the central cylinder on the existing separator is fixed to the separator, and its depth within the separator is not adjustable. Therefore, when changing to different types of fuel, the original central cylinder must be removed from the separator to adjust its depth, requiring significant manpower and resources.

[0003] In addition, existing multi-process circulating bed boilers are shipped in bulk, meaning that each part of the boiler is shipped separately as individual components and then installed on-site. However, assembling these components on-site is a huge undertaking, extremely time-consuming (at least two months to assemble a medium-sized boiler), and requires highly skilled installers, necessitating a large number of experienced workers, resulting in high labor and time costs.

[0004] Therefore, further improvements to the existing separator are needed. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the purpose of this invention is to propose a modular circulating fluidized bed boiler gas-solid separation device and a multi-process circulating bed boiler. This invention improves the solid-gas separation efficiency of the gas-solid separation device by correspondingly setting two parallel and interconnected gas-solid separators at one air inlet, resulting in purer high-temperature gas entering the tail flue. This not only avoids fuel waste but also prevents the light fuel in the high-temperature flue gas from wearing down the equipment in the tail flue, thereby extending the service life of the equipment in the tail flue. It also prevents ash accumulation on the heating surfaces of the tail shaft. Furthermore, it facilitates on-site installation, disassembly, and replacement.

[0006] In one aspect of the invention, a modular circulating fluidized bed boiler gas-solid separation device is provided. According to an embodiment of the invention, the gas-solid separation device includes:

[0007] A gas-solid separator module is provided with an air inlet on the upper side wall. The gas-solid separator module includes two gas-solid separators. The air inlet is connected to the two gas-solid separators, and the two gas-solid separators are connected in parallel and communicate with each other. The two gas-solid separators are arranged symmetrically about the center line of the air inlet. A flow guide triangle is provided on the side of the gas-solid separator module away from the air inlet. The flow guide triangle includes a first inclined surface and a second inclined surface. The first inclined surface and the second inclined surface are arranged symmetrically about the center line of the air inlet, and the first inclined surface and the second inclined surface are respectively inclined towards the center line of the air inlet and intersect.

[0008] The central cylinder module includes two central cylinders. Each gas-solid separator has one central cylinder at its top, and the central cylinder is detachably and sealed to the top of the gas-solid separator. The two central cylinders are arranged symmetrically about the center line of the air inlet.

[0009] According to the above embodiments of the modular circulating fluidized bed boiler gas-solid separation device of the present invention, compared with the prior art scheme of setting a total gas-solid separation device at one air inlet, the present invention sets two parallel and interconnected gas-solid separators at one air inlet. Under the premise of the same overall size of the gas-solid separator module and the processing capacity of ash-containing gas, the diameter of its gas-solid separator is relatively small, thereby improving the solid-gas separation effect and separation efficiency of the gas-solid separation device. At the same time, a guide triangle is set on the side of the gas-solid separator module away from the air inlet to ensure that the ash-containing gas entering the two gas-solid separators rotates and separates according to their respective rotation paths, further ensuring the solid-gas separation effect and separation efficiency of the gas-solid separation device. Thus, the solid-gas separation efficiency of the gas-solid separation device is improved, making the high-temperature gas entering the tail flue more pure. This not only avoids fuel waste, but also avoids the wear of light fuel in the high-temperature flue gas on the equipment in the tail flue, thereby extending the service life of the equipment in the tail flue, and also avoids ash accumulation on the heating surface of the tail shaft. In addition, by designing the gas-solid separation device into multiple relatively large modules, each of which is self-contained, on-site installation only requires assembling the modules, avoiding the need to assemble from small parts as in existing technologies. This makes on-site installation, disassembly, and replacement easier and effectively overcomes the problems of large on-site installation workload, long time consumption, and high requirements for the installation skills of the staff.

[0010] In addition, the modular circulating fluidized bed boiler gas-solid separation device according to the above embodiments of the present invention may also have the following additional technical features:

[0011] In some embodiments of the present invention, the distance a between the centerline of the gas-solid separator and the first straight line is (1.5-2)d, the first straight line passes through the vertex of the guide triangle near the air inlet and is parallel to the centerline of the gas-solid separator, d is the diameter of the central cylinder, and the centerline of the gas-solid separator is perpendicular to the centerline of the air inlet.

[0012] In some embodiments of the present invention, the distance b between the first straight line and the first side surface is (1-1.5)d, the first side surface is the side surface of the gas-solid separation device away from the air inlet, and the first side surface is parallel to the center line of the gas-solid separator.

[0013] In some embodiments of the present invention, the distance c of the orthographic projection of the guide triangle onto the first side is (2-3)d.

[0014] In some embodiments of the present invention, a first mating part is provided on the side wall of the central cylinder, and a second mating part is provided on the top of the gas-solid separator. The first mating part and the second mating part cooperate to make the distance by which the central cylinder penetrates into the gas-solid separator module adjustable.

[0015] In some embodiments of the present invention, the first mating part is a nut, the second mating part is a bolt, and the nut and the bolt are mated to make the distance by which the central cylinder penetrates into the gas-solid separator module adjustable.

[0016] In some embodiments of the present invention, the distance by which the central cylinder extends into the gas-solid separator module is adjustable within the range of (0.1-0.2)H, where H is the diameter of the air inlet.

[0017] In some embodiments of the present invention, the distance d from the central cylinder into the gas-solid separator module is (0.5-1.2)H.

[0018] In some embodiments of the present invention, a refractory material layer is provided on the wall surface of the gas-solid separator module.

[0019] In a second aspect, this invention proposes a multi-process circulating fluidized bed boiler, which includes the aforementioned modular circulating fluidized bed boiler gas-solid separation device. Compared with the prior art, this improves the solid-gas separation efficiency of the multi-process circulating fluidized bed boiler, making the high-temperature gas entering the tail flue of the boiler purer. This not only avoids fuel waste but also prevents the light fuel in the high-temperature flue gas from wearing down the equipment in the tail flue, thereby extending the service life of the equipment in the tail flue. It also prevents ash accumulation on the heating surfaces of the tail shaft. Furthermore, it facilitates the on-site installation, disassembly, and replacement of the multi-process circulating fluidized bed boiler.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a side view of a modular circulating fluidized bed boiler gas-solid separation device according to an embodiment of the present invention;

[0023] Figure 2 This is a top view of a modular circulating fluidized bed boiler gas-solid separation device according to an embodiment of the present invention.

[0024] Attached image captions:

[0025] 100-Gas-solid separation device, 110-Gas-solid separator module, 111-Air inlet, 112-First gas-solid separator, 113-Second gas-solid separator, 114-Guide triangle, 114-1-First inclined plane, 114-2-Second inclined plane, 120-Central cylinder module, 121-First central cylinder, 122-Second central cylinder, 123-First mating part, 124-Second mating part. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the gas-solid separation device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] In one aspect of the invention, a modular circulating fluidized bed boiler gas-solid separation device is provided, as shown in the attached diagram. Figure 1 and 2The gas-solid separation device 100 includes: a gas-solid separator module 110, an air inlet 111 is provided on the upper side wall of the gas-solid separator module 110, the gas-solid separator module 110 includes two gas-solid separators, the air inlet 111 is connected to the two gas-solid separators, and the two gas-solid separators are connected in parallel and communicate with each other. The two gas-solid separators are arranged symmetrically about the center line AA of the air inlet 111; a flow guide triangle 114 is provided on the side of the gas-solid separator module 110 away from the air inlet 111, the flow guide triangle 114 includes a first inclined surface 114. -1 and the second inclined surface 114-2, the first inclined surface 114-1 and the second inclined surface 114-2 are symmetrically arranged about the center line of the air inlet 111, and the first inclined surface 114-1 and the second inclined surface 114-2 are respectively inclined towards the center line of the air inlet 111 and intersect; the center cylinder module 120 includes two center cylinders, one of which is provided on the top of each gas-solid separator, and the center cylinder is detachably and sealed to the top of the gas-solid separator. The two center cylinders are symmetrically arranged about the center line AA of the air inlet 111. Therefore, compared with the prior art of setting a total gas-solid separation device at one air inlet, the present invention, by setting two parallel and interconnected gas-solid separators at one air inlet, under the premise of the same overall size of the gas-solid separator module and the amount of ash-containing gas to be processed, has a relatively smaller diameter of its gas-solid separator, thereby improving the solid-gas separation effect and separation efficiency of the gas-solid separation device. Meanwhile, a guide triangle is set on the side of the gas-solid separator module away from the air inlet to ensure that the ash-containing gases entering the two gas-solid separators rotate and separate according to their respective rotation paths, further ensuring the solid-gas separation effect and efficiency of the gas-solid separation device. This improves the solid-gas separation efficiency of the gas-solid separation device, making the high-temperature gas entering the tail flue purer. This not only avoids fuel waste but also prevents the light fuels in the high-temperature flue gas from wearing down the equipment in the tail flue, thus extending the service life of the equipment in the tail flue. It also prevents ash accumulation on the heating surface of the tail shaft. Furthermore, by designing the gas-solid separation device as multiple relatively large modules, each self-contained, on-site installation only requires assembling the modules, avoiding the need to assemble from small parts as in existing technologies. This facilitates on-site installation, disassembly, and replacement, effectively overcoming the problems of large on-site installation workload, long installation time, and high requirements for operator skill.

[0032] The following is in conjunction with the appendix Figure 1 and 2 The gas-solid separation apparatus according to embodiments of the present invention will be described in further detail.

[0033] In embodiments of the present invention, the number of air inlets 111 provided on the side of the gas-solid separator module 110 is not particularly limited. Those skilled in the art can design the gas-solid separator 100 according to the amount of ash-containing gas that needs to be processed (i.e., the amount of ash-containing gas coming out of the combustion chamber). Specifically, if the amount of ash-containing gas that needs to be processed by the gas-solid separator 100 is small, one air inlet 111 is sufficient. When the amount of ash-containing gas that needs to be processed is large, multiple air inlets 111 can be considered. Each air inlet 111 corresponds to two parallel and interconnected gas-solid separators, which are symmetrically arranged about the center line AA of the air inlet (i.e., back-to-back).

[0034] The following example, using a gas-solid separator module 110 with an air inlet 111 on its side, illustrates the process of ash-containing gas from the combustion chamber entering the gas-solid separator 100 for cyclone inertial separation:

[0035] Reference Appendix Figure 2 The ash-containing gas exiting the combustion chamber enters the gas-solid separation device 100 through inlet 111. A portion of the gas enters the first gas-solid separator 112, and the remainder enters the second gas-solid separator 113. Since the two gas-solid separators are symmetrical, the amount of gas entering each separator is approximately equal, achieving self-balance. (See attached diagram) Figure 2 The first gas-solid separator 112 has a first central cylinder 121 at its top, and the second gas-solid separator 113 has a second central cylinder 122 at its top. The ash-laden gas entering the first gas-solid separator 112 rotates within the first central cylinder 121. After rotation, the gas flows out of the central cylinder and into the tail flue, while the ash falls to the bottom of the first gas-solid separator 112 due to inertia, thus achieving cyclone inertial separation. The process of cyclone inertial separation of the ash-laden gas entering the second gas-solid separator 113 is the same as that of the first gas-solid separator 112, and will not be described further here.

[0036] Under the premise that the overall size of the gas-solid separator module and the amount of ash-containing gas to be processed are the same, the reason why improving the original large gas-solid separator module into two relatively small parallel and interconnected gas-solid separators can improve the solid-gas separation efficiency of the gas-solid separation device is that the smaller the diameter of the gas-solid separator, the better its separation effect and the higher the separation efficiency.

[0037] The flow-guiding triangles serve to guide the flow, ensuring that the gases entering the two gas-solid separators rotate and separate along their respective paths. Without these triangles, turbulence may occur, preventing the gases from achieving self-equilibrium. Specifically, the first inclined surface forms the wall of the first gas-solid separator, guiding the flow of the gas entering it; similarly, the second inclined surface forms the wall of the second gas-solid separator, guiding the flow of the gas entering it as well.

[0038] According to some specific embodiments of the present invention, refer to the appendix Figure 2 The distance a between the centerline BB of the gas-solid separator module and the first straight line CC is (1.5-2)d. The first straight line CC passes through the vertex of the guide triangle 114 near the inlet 111 and is parallel to the centerline BB of the gas-solid separator module. d is the diameter of a single central cylinder (it should be noted that the diameters of the two central cylinders are equal). The centerline BB of the gas-solid separator module is perpendicular to the centerline AA of the inlet. Determining the vertex of the guide triangle 114 near the inlet 111 (i.e., the starting bend of the gas-solid two-phase flow entering the separator) requires comprehensive consideration of wear, flow resistance, solid particle separation trajectory, and separation efficiency. By limiting the distance a between the centerline BB of the gas-solid separator module and the first straight line CC within a certain range, the optimal overall efficiency is obtained.

[0039] According to further specific embodiments of the present invention, see attached drawing. Figure 2 The distance b between the first straight line CC and the first side surface is (1-1.5)d. The first side surface is the side of the gas-solid separator module 110 furthest from the air inlet 111, and it is parallel to the center line BB of the gas-solid separator module. Therefore, by limiting the distance b between the first straight line CC and the first side surface within a certain range, the shape of the guide triangle sidewall and the aspect ratio of the entire interface are determined. Optimized dimensions minimize wear while ensuring maximum separation efficiency.

[0040] According to some specific embodiments of the present invention, see attached drawing. Figure 2 The distance c of the orthographic projection of the guide triangle 114 on the first side is (2-3)d. Thus, by limiting the distance c of the orthographic projection of the guide triangle 114 on the first side to a certain range, the angle at which the gas-solid two-phase flow makes a tangential turn along the separator inlet is determined. The optimized dimensions can minimize the wear on the windward side, reduce resistance, and avoid the formation of secondary vortices, thereby achieving higher separation efficiency for small particles.

[0041] Besides the diameter of the gas-solid separator, the depth of the central cylinder within the gas-solid separator module also affects the separation effect. Specifically, the greater the depth of the central cylinder within the gas-solid separator module, the better the separation effect, but the separation resistance increases accordingly, leading to higher power consumption. Different types of fuels have different requirements for the separation effect of the gas-solid separation device. To enable the gas-solid separation device of this invention to be applied to different types of fuels, further reference is made to the appendix. Figure 1 The central cylinder has a first mating part 123 on its side wall, and a second mating part 124 on its top. The first mating part 123 and the second mating part 124 engage to make the depth of the central cylinder within the gas-solid separator module adjustable. In existing technology, the central cylinder is fixed to the gas-solid separator, and its depth within the separator is not adjustable. Therefore, when changing to a different type of fuel, the original central cylinder must be removed from the separator to adjust its depth, requiring significant manpower and resources. This invention, by making the depth of the central cylinder within the gas-solid separator module adjustable, allows for easy adjustment of the depth simply by engaging the first and second mating parts when changing to a different type of fuel, saving considerable manpower and resources.

[0042] As a specific example, the first mating part 123 is a nut, and the second mating part 124 is a bolt. The nut and the bolt are mated to make the distance of the central cylinder into the gas-solid separator module adjustable.

[0043] According to some specific embodiments of the present invention, the distance d from which the central cylinder penetrates into the gas-solid separator module is (0.5-1.2)H, where H is the diameter of the air inlet 111. Thus, by limiting the distance of the central cylinder into the gas-solid separator module to a certain range, the required separation efficiency for most types of fuels is satisfied, while avoiding the problems of excessive resistance and high power consumption caused by excessive depth.

[0044] According to some specific embodiments of the present invention, the adjustable range of the distance of the central cylinder into the gas-solid separator module is (0.1-0.2)H, where H is the diameter of the air inlet 111. Thus, the adjustable range of the distance of the central cylinder into the gas-solid separator module is limited to a certain range, further satisfying the different requirements of different types of fuels for the separation effect of the gas-solid separator.

[0045] Furthermore, a refractory material layer (not shown in the figure) is provided on the wall surface of the gas-solid separator module, which improves the fire resistance and wear resistance of the wall surface of the gas-solid separator module.

[0046] In a second aspect, this invention proposes a multi-process circulating fluidized bed boiler, which includes the aforementioned modular circulating fluidized bed boiler gas-solid separation device. Therefore, compared with the prior art, the solid-gas separation efficiency of this multi-process circulating fluidized bed boiler is improved, resulting in purer high-temperature gas entering the tail flue of the boiler. This not only avoids fuel waste but also prevents light fuels in the high-temperature flue gas from wearing down equipment in the tail flue, thereby extending the service life of the equipment in the tail flue. It also prevents ash accumulation on the heating surfaces of the tail shaft. Furthermore, it facilitates the on-site installation, disassembly, and replacement of the multi-process circulating fluidized bed boiler.

[0047] Specifically, the multi-process circulating fluidized bed boiler includes a main combustion chamber, an auxiliary combustion chamber, a burnout chamber, a gas-solid separation device, and a tail flue (with heat exchange components installed in the tail flue) connected in sequence. The bottom of the main combustion chamber is equipped with an air distribution device, and the side of the main combustion chamber is equipped with a feeding device. The upper part of the main combustion chamber is connected to the upper part of the auxiliary combustion chamber. The bottom of the auxiliary combustion chamber is connected to the bottom of the burnout chamber, and the top of the burnout chamber is connected to the air inlet on the side of the gas-solid separation device. The gas-solid separation device 100 has at least one air inlet 111 on its side. Each air inlet 111 corresponds to two parallel and interconnected gas-solid separators. The two gas-solid separators are symmetrically arranged about the center line AA of the air inlet. Each gas-solid separator has a central cylinder at its top, and the two central cylinders are symmetrically arranged about the center line AA of the air inlet. The gas-solid separation device 100 is connected to the top of the tail flue through the central cylinder.

[0048] In an embodiment of the invention, fuel first enters the main combustion chamber via a feeding device. The air distribution device provides air distribution for the multi-process circulating bed boiler. Under the influence of the air distribution, the fuel burns in the main combustion chamber, generating flue gas. Lighter, unburned fuel is introduced into the auxiliary combustion chamber along with the flue gas. After further combustion in the auxiliary combustion chamber, even lighter, unburned fuel enters the burnout chamber along with the flue gas to continue burning. The flue gas exiting the burnout chamber contains a large amount of ash and some unburned fuel; therefore, a gas-solid separation device is used for cyclone inertial separation. A primary return device is installed at the bottom of the auxiliary combustion chamber and the burnout chamber, and a secondary return device is installed at the bottom of the separator, respectively returning the unburned fuel remaining in their respective furnaces to the main combustion chamber for further circulating combustion.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A modular circulating fluidized bed boiler gas-solid separation device, characterized in that, include: A gas-solid separator module is provided with an air inlet on the upper side wall. The gas-solid separator module includes two gas-solid separators. The air inlet is connected to the two gas-solid separators, and the two gas-solid separators are connected in parallel and communicate with each other. The two gas-solid separators are arranged symmetrically about the center line of the air inlet. A flow guide triangle is provided on the side of the gas-solid separator module away from the air inlet. The flow guide triangle includes a first inclined surface and a second inclined surface. The first inclined surface and the second inclined surface are arranged symmetrically about the center line of the air inlet, and the first inclined surface and the second inclined surface are respectively inclined towards the center line of the air inlet and intersect. The central cylinder module includes two central cylinders. Each gas-solid separator has one central cylinder at its top, and the central cylinder is detachably and sealed to the top of the gas-solid separator. The two central cylinders are symmetrically arranged about the center line of the air inlet. The distance a between the centerline of the gas-solid separator and the first straight line is (1.5-2)D. The first straight line passes through the vertex of the guide triangle near the air inlet and is parallel to the centerline of the gas-solid separator. D is the diameter of the central cylinder. The centerline of the gas-solid separator is perpendicular to the centerline of the air inlet. The central cylinder has a first mating part on its side wall and the gas-solid separator has a second mating part on its top. The first and second mating parts are mated together so that the distance by which the central cylinder penetrates into the gas-solid separator module is adjustable. The distance by which the central cylinder extends into the gas-solid separator module is adjustable within the range of (0.1-0.2)H, where H is the diameter of the air inlet. The distance d from the central cylinder into the gas-solid separator module is (0.5-1.2)H.

2. The modular circulating fluidized bed boiler gas-solid separation device according to claim 1, characterized in that, The distance b between the first straight line and the first side is (1-1.5)d. The first side is the side of the gas-solid separator module away from the air inlet, and the first side is parallel to the center line of the gas-solid separator.

3. The modular circulating fluidized bed boiler gas-solid separation device according to claim 2, characterized in that, The distance c of the orthographic projection of the guide triangle onto the first side is (2-3)d.

4. The modular circulating fluidized bed boiler gas-solid separation device according to claim 1, characterized in that, The first mating part is a nut, and the second mating part is a bolt. The nut and the bolt are mated to make the distance by which the central cylinder penetrates into the gas-solid separator module adjustable.

5. The modular circulating fluidized bed boiler gas-solid separation device according to any one of claims 1-3, characterized in that, The gas-solid separator module has a refractory material layer on its wall surface.

6. A multi-process circulating fluidized bed boiler, characterized in that, The gas-solid separation device includes any one of claims 1-5.

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