Fluidization heat exchange material returning device

Abstract

The fluidized heat exchange material returning device comprises a direct material returning area and a heat exchange material returning area, the direct material returning area comprises a first descending section, an ascending section and a first material returning section which are communicated in sequence, and the heat exchange material returning area comprises a second descending section, a heat exchange ash amount regulation and control section, an external bed heat exchange section and a second material returning section which are communicated in sequence. The first descending section and the second descending section are of a shared structure, and the first material returning section and the second material returning section are of a shared structure or an independent structure. The system has the beneficial effects that the system structure design is simple, the adjusting characteristic is good, the heat exchange bin layout is reasonable, the arrangement requirement of a high-temperature-level heating surface can be met, the problem of high-temperature corrosion of a CFB boiler combusting high-chlorine fuel can be effectively solved, high-parameter and large-scale boiler can be easily achieved, and the implementation is achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of circulating fluidized beds in combustion equipment, and specifically relates to a fluidized heat exchange recycler. Background Art

[0002] Circulating fluidized bed boilers (CFBs), with their wide fuel adaptability, high combustion efficiency, and low pollutant emissions, have been widely used in various sectors, including coal-fired power generation, biomass power generation, and power generation from the incineration of domestic and industrial waste. CFB boilers burning high-chloride fuels, such as high-chloride coal, biomass, and solid waste, generate highly corrosive acidic gases in their flue gas at high temperatures, as these fuels contain more chlorine than conventional coal. This high-temperature flue gas is prone to high-temperature corrosion of metals, and the corrosion becomes more severe as the wall temperature rises.

[0003] CFB boilers, which burn fuels such as high-chlorine coal, biomass, and solid waste, are subject to high-temperature corrosion. High-temperature heating surfaces are not suitable for placement in the high flue gas temperature areas of the furnace and tail shaft. This limits the space available for heating surface placement and hinders the development of high-performance, large-scale boilers. The circulating material in the main circulation loop of a CFB boiler is separated from the flue gas in a cyclone separator and returned to the furnace through a return feeder. At high temperatures, corrosive substances primarily exist in the flue gas in a gaseous state. The circulating material, which is a solid particle, contains relatively low levels of corrosive substances and exhibits low corrosive properties. Therefore, exchanging heat between the circulating material separated by the cyclone separator and the heating surface can reduce the risk of corrosion. This heat exchange method is suitable for high-temperature heating surfaces; this type of heat exchange equipment is commonly referred to as an external bed. Placing heating surfaces with a medium temperature exceeding 400°C in an external bed, where the high-temperature circulating ash heats the heating surface, is the best solution to this corrosion problem.

[0004] In response to the above problems, different units have proposed different patents and solutions for external beds. For example, the external heat exchanger developed by Lurgi and Alstom is arranged at the bottom of the returner, and the amount of heat exchange ash is adjusted by the cone valve installed on the returner. The technology is mature, but the cone valve has high reliability requirements and is prone to wear. At the same time, it mainly relies on imports, is expensive, and has high maintenance costs. For example, the external bed structure of a circulating fluidized bed boiler that burns solid waste proposed in publication number CN115574314A, an external bed is arranged at the bottom of the returner, the returner outlet is connected to the external bed inlet, and the returner ash discharge pipe is connected to the external bed return port. The amount of heat exchange ash in the external bed is indirectly controlled by the ash discharge pipe regulating valve. The control difficulty of this technology is higher than that of the cone valve solution, and the high-temperature ash discharge pipe regulating valve has less selectivity. It also has high reliability requirements, easy wear, and high maintenance costs. For example, the publication number CN112377895B proposes an adjustable dual-bed anti-corrosion external high-temperature superheater ash return device and method, which directly enlarges the volume of the return device, arranges the heating surface in the rear half of the return device, and adjusts the resistance of the ash return through a liftable partition. This solution cannot achieve control of the ash volume of the external bed heat exchange and is not feasible.

[0005] The above solutions and patents have some problems such as high price, high maintenance cost, and easy wear. Some of the solutions are too idealistic and not feasible. Utility Model Content

[0006] The purpose of this application is to provide a fluidized heat exchange recycler, which adopts an integrated design of a recycler and an external bed, utilizes the U-valve recycler principle, and forms a direct recycler area and a heat exchange recycler area by setting relevant partition walls. The circulating material has two routes in the recycler, and the material quantity of the two routes is adjusted by separately controlling the fluidized air volume in the direct recycler area and the heat exchange recycler area, thereby adjusting the heat exchange rate of the heating surface. The system structure is simple in design and has good adjustment characteristics. At the same time, the external bed is reasonably arranged, which can meet the layout requirements of the high-temperature heating surface, can effectively solve the high-temperature corrosion problem of CFB boilers burning high-chlorine fuel, is conducive to achieving high parameters and large-scale boilers, and is feasible.

[0007] The purpose of this application is achieved through the following technical solutions:

[0008] A fluidized heat exchange recycler includes a direct recycler area and a heat exchange recycler area. The direct recycler area includes a first descending section, an ascending section and a first recycler area that are connected in sequence. The heat exchange recycler area includes a second descending section, a heat exchange ash quantity control section, an external bed heat exchange section and a second recycler area that are connected in sequence. The first descending section and the second descending section are a common structure, and the first recycler area and the second recycler area are a common structure or an independent structure.

[0009] Furthermore, one fluidized heat exchange recirculator corresponds to one separator, or one fluidized heat exchange recirculator corresponds to two separators.

[0010] Furthermore, the common structure of the first descending section and the second descending section includes a vertical pipe, a descending section valve body, a descending section air chamber and a descending section wind hood. The vertical pipe is connected to the upper part of the descending section valve body, the descending section air chamber is located at the lower part of the descending section valve body, and a descending section wind hood is provided on the distribution bin air distribution plate in the descending section air chamber. The lower part of the descending section valve body is respectively connected to the lower part of the ascending section and the lower part of the heat exchange ash quantity control section.

[0011] Furthermore, the rising section includes a rising section valve body, a rising section air chamber and a rising section air hood. The lower part of the rising section valve body is connected to the lower part of the first descending section. The rising section air chamber is located at the lower part of the rising section valve body. The distribution bin air distribution plate in the rising section air chamber is provided with a rising section air hood. The upper part of the rising section valve body is connected to the upper part of the first return section.

[0012] Furthermore, the first return section includes a return section valve body and a return pipe, the upper part of the return section valve body is connected to the upper part of the rising section, and the lower part of the return section valve body is connected to the return pipe.

[0013] Furthermore, the first descending section and the ascending section are separated by a first upper partition wall, and the ascending section and the first return section are separated by a first lower partition wall. There is a height difference H1 between the lower edge of the first upper wall of the first upper partition wall and the upper edge of the first lower wall of the first lower partition wall, and H1 is 100 to 500 mm.

[0014] Furthermore, the heat exchange ash quantity control section includes a heat exchange ash quantity control section valve body, a heat exchange ash quantity control section air chamber and a heat exchange ash quantity control section air hood. The lower part of the heat exchange ash quantity control section valve body is connected with the lower part of the second descending section. The heat exchange ash quantity control section air chamber is located at the lower part of the heat exchange ash quantity control section valve body. A heat exchange ash quantity control section air hood is provided on the distribution bin air distribution plate in the heat exchange ash quantity control section air chamber. The upper part of the heat exchange ash quantity control section valve body is connected with the upper part of the external bed heat exchange section.

[0015] Furthermore, the external bed heat exchange section includes a heat exchange bin, a heat exchange tube bundle, a heat exchange bin air chamber, a heat exchange bin hood and a heat exchange bin air distribution plate. The upper part of the heat exchange bin is connected to the upper part of the heat exchange ash quantity control section. The heat exchange bin is provided with a heat exchange tube bundle located at the upper part, the heat exchange bin air chamber is located at the lower part of the heat exchange bin, and a heat exchange bin hood is provided on the heat exchange bin air distribution plate in the heat exchange bin air chamber.

[0016] Furthermore, the heat exchange tube bundle is arranged in the heat exchange chamber in a buried tube structure, and the heat exchange tube bundle serves as a high-temperature heating surface.

[0017] Furthermore, the first return section and the second return section are independent structures, and the second return section includes a low-temperature ash return pipe, which is connected to the upper part of the external bed heat exchange section.

[0018] Furthermore, the second descending section and the heat exchange ash quantity control section are separated by a second upper partition wall, the heat exchange ash quantity control section and the external bed heat exchange section are separated by a second lower partition wall, and the external bed heat exchange section and the second return material section are separated by a third lower partition wall. There is a step height H2 between the lower edge of the second upper wall of the second upper partition wall and the upper edge of the second lower wall of the second lower partition wall, and H2 is 100 to 500 mm. The height of the second lower partition wall is consistent with that of the third lower partition wall.

[0019] Furthermore, the descending section valve body of the first descending section, the ascending section valve body of the ascending section and the heat exchange ash quantity control section valve body of the heat exchange ash quantity control section together constitute a material distribution bin, the heat exchange ash quantity control section air chamber of the heat exchange ash quantity control section, the descending section air chamber of the first descending section, the ascending section air chamber and the heat exchange bin air chamber 22 of the external bed heat exchange section are all independent air chambers, the heat exchange ash quantity control section air hood, the descending section air hood and the ascending section air hood are partitioned and arranged on the distribution bin air distribution plate, and the arrangement height of the heat exchange bin air distribution plate is lower than the arrangement height of the distribution bin air distribution plate.

[0020] The beneficial effects of this application are as follows: the system structure is simple in design, has good adjustment characteristics, and the layout of the heat exchange chamber is reasonable, which can meet the layout requirements of the high-temperature heating surface, can effectively solve the high-temperature corrosion problem of CFB boilers burning high-chlorine fuel, is conducive to achieving high parameters and large-scale boilers, and has feasibility.

[0021] The aforementioned main solution of this application and its further options can be freely combined to form multiple solutions, all of which are solutions that can be adopted and protected by this application; and in this application, (non-conflicting options) can also be freely combined with each other and with other options. After understanding this solution, those skilled in the art will understand that there are many combinations based on existing technology and common knowledge, all of which are technical solutions to be protected by this application, and they are not exhaustive here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of Example 1 of the present application.

[0023] Figure 2 yes Figure 1 A1-A1 cross-sectional view.

[0024] Figure 3 yes Figure 1 C1-C1 cross-sectional view.

[0025] Figure 4 yes Figure 1 B1-B1 cross-sectional view.

[0026] Figure 5 It is a structural diagram of Example 2 of the present application.

[0027] Figure 6 yes Figure 5 D2-D2 cross-sectional view.

[0028] Figure 7 yes Figure 5 A2-A2 sectional view.

[0029] Figure 8 yes Figure 5 C2-C2 cross-sectional view.

[0030] Figure 9 yes Figure 5 B2-B2 cross-sectional view.

[0031] Figure 10 It is a structural diagram of Example 3 of the present application.

[0032] Figure 11 yes Figure 10 D3-D3 cross-sectional view.

[0033] Figure 12 yes Figure 10 A3-A3 sectional view.

[0034] Figure 13 yes Figure 10 C3-C3 cross-sectional view.

[0035] Figure 14 yes Figure 10 B3-B3 cross-sectional view.

[0036] Figure 15 It is a structural diagram of Example 4 of the present application.

[0037] Figure 16 yes Figure 15 B4-B4 cross-sectional view.

[0038] Figure 17 yes Figure 15 D4-D4 cross-sectional view.

[0039] Figure 18 yes Figure 15 A4-A4 cross-sectional view.

[0040] In the figure: 1- riser, 2- descending section valve body, 3- ascending section valve body, 4- return section valve body, 5- return pipe, 6- heat exchange ash quantity control section valve body, 7- first upper partition wall, 7-1- lower edge of first upper wall, 8- second upper partition wall, 8-1- lower edge of second upper wall, 9- first lower partition wall, 9-1- upper edge of first lower wall, 10- second lower partition wall, 10-1- upper edge of second lower wall, 11- heat exchange bin, 12- heat exchange tube bundle, 13- Three lower partition walls, 13-1-upper edge of the third lower partition wall, 14-low-temperature ash return pipe, 15-heat exchange ash quantity control section air chamber, 16-descending section air chamber, 17-ascending section air chamber, 18-heat exchange ash quantity control section air hood, 19-descending section air hood, 20-ascending section air hood, 21-distribution bin air distribution plate, 22-heat exchange bin air chamber, 23-heat exchange bin air hood, 24-heat exchange bin air distribution plate; (L) after the above figure number represents the left side, and (R) represents the right side. DETAILED DESCRIPTION

[0041] The present application will be further described below with reference to specific embodiments and accompanying drawings.

[0042] refer to Figures 1 to 18 A fluidized heat exchange recirculator is shown, comprising a direct recirculation section and a heat exchange recirculation section. The direct recirculation section comprises a first descending section, an ascending section, and a first recirculation section, all connected in sequence along the flow direction. The heat exchange recirculation section comprises a second descending section, a heat exchange ash quantity control section, an external bed heat exchange section, and a second recirculation section, all connected in sequence along the flow direction. The first descending section and the second descending section are a shared structure, while the first recirculation section and the second recirculation section may be shared or independent structures.

[0043] The technical solution is described below using Example 1 as an example:

[0044] refer to Figure 1 and Figure 2 As shown, the structure of the direct return zone is consistent with the structure of a conventional U-valve returner, including a first descending section, an ascending section and a first return section that are sequentially connected along the flow direction.

[0045] The common structure of the first descending section and the second descending section includes a vertical pipe 1, a descending section valve body 2, a descending section air chamber 16 and a descending section wind cap 19. The vertical pipe 1 is connected to the upper part of the descending section valve body 2. The descending section air chamber 16 is located at the lower part of the descending section valve body 2. The distribution bin air distribution plate 21 in the descending section air chamber 16 is provided with a descending section wind cap 19. The lower part of the descending section valve body 2 is respectively connected to the lower part of the ascending section and the lower part of the heat exchange ash quantity control section.

[0046] The rising section includes a rising section valve body 3, a rising section air chamber 17 and a rising section air hood 20. The lower part of the rising section valve body 3 is connected to the lower part of the first descending section. The rising section air chamber 17 is located at the lower part of the rising section valve body 3. The distribution bin air distribution plate 21 in the rising section air chamber 17 is provided with a rising section air hood 20. The upper part of the rising section valve body 3 is connected to the upper part of the first return section.

[0047] The first return section includes a return section valve body 4 and a return pipe 5 . The upper portion of the return section valve body 4 is communicated with the upper portion of the ascending section, and the lower portion of the return section valve body 4 is communicated with the return pipe 5 .

[0048] The first descending section and the ascending section are separated by the first upper partition wall 7, and the ascending section and the first return section are separated by the first lower partition wall 9. There is a height difference H1 between the first upper wall lower edge 7-1 of the first upper partition wall 7 and the first lower wall upper edge 9-1 of the first lower partition wall 9. H1 is 100 to 500 mm to ensure that the material separated by the separator can establish a certain material level height in the vertical pipe 1 to ensure the sealing of the direct return loop.

[0049] refer to Figures 1 to 4 As shown, the heat exchange and return section includes the second descending section, the heat exchange ash quantity control section, the external bed heat exchange section and the second return section, which are sequentially connected along the flow direction. The first descending section and the second descending section are a common structure.

[0050] The heat exchange ash quantity control section includes a heat exchange ash quantity control section valve body 6, a heat exchange ash quantity control section air chamber 15 and a heat exchange ash quantity control section wind cap 18. The lower part of the heat exchange ash quantity control section valve body 6 is connected to the lower part of the second descending section. The heat exchange ash quantity control section wind chamber 15 is located at the lower part of the heat exchange ash quantity control section valve body 6. The heat exchange ash quantity control section wind cap 18 is provided on the distribution bin air distribution plate 21 in the heat exchange ash quantity control section wind chamber 15. The upper part of the heat exchange ash quantity control section valve body 6 is connected to the upper part of the external bed heat exchange section.

[0051] The external bed heat exchange section includes a heat exchange chamber 11, a heat exchange tube bundle 12, a heat exchange chamber air chamber 22, a heat exchange chamber hood 23, and a heat exchange chamber air distribution plate 24. The upper portion of the heat exchange chamber 11 is connected to the upper portion of the heat exchange ash control section. The heat exchange chamber 11 houses the heat exchange tube bundle 12 at its upper portion, while the heat exchange chamber air chamber 22 is located at its lower portion. The heat exchange chamber hood 23 is mounted on the heat exchange chamber air distribution plate 24 within the heat exchange chamber 22. The heat exchange tube bundle 12 is arranged within the heat exchange chamber 11 in an embedded tube structure. It serves as a high-temperature heating surface and can be configured as a high-temperature superheater, a high-temperature reheater, or a medium-temperature superheater, depending on the design requirements of the thermal system.

[0052] The second descending section is separated from the heat exchange ash flow control section by a second upper partition wall 8. The heat exchange ash flow control section is separated from the external bed heat exchange section by a second lower partition wall 10. The external bed heat exchange section is separated from the second return section by a third lower partition wall 13. A step height H2 of 100 to 500 mm exists between the second upper wall bottom edge 8-1 of the second upper partition wall 8 and the second lower wall top edge 10-1 of the second lower partition wall 10 to ensure the sealing of the heat exchange circuit. The second lower partition wall 10 and the third lower partition wall 13 are of the same height, ensuring that the high-temperature circulating material in the heat exchange chamber 11 can completely cover the heat exchange tube bundle 12 and meet heat exchange requirements.

[0053] The heat exchange ash flow control section plenum 15, the first descending section valve body 2, the ascending section valve body 3, and the heat exchange bin plenum 22 of the external bed heat exchange section are all independent plenums with separate air distribution. The plenum hoods 18, 19, and 20 can be designed separately and arranged on the distribution bin air distribution plate 21. The heat exchange bin air distribution plate 24 is positioned at a lower height than the distribution bin air distribution plate 21 to increase the heat exchange bin space and meet the requirements of heat exchange tube bundle layout and heat exchange.

[0054] The descending section air chamber 16 of the first descending section, the ascending section air chamber 17 of the ascending section, and the lower portion of the heat exchange ash quantity control section valve body 6 of the heat exchange ash quantity control section arranged on the same side are interconnected, forming a material distribution bin, the upper portion of which is separated by a first upper partition wall 7 and a second upper partition wall 8. The high-temperature circulating material separated by the cyclone separator of the circulating fluidized bed boiler enters the material distribution bin through the riser 1. Based on the heat exchange requirements, the air volume of the ascending section and the heat exchange ash quantity control section is regulated to achieve a proportional distribution of the high-temperature circulating material between direct return and return after heat exchange. The high-temperature circulating material can be selectively returned partially or entirely to the furnace via the direct return section, or partially or entirely to the furnace after heat exchange via the heat exchange return section.

[0055] The valve body and partition wall can be of thermal insulation type with castables laid inside, or of cooling type, consisting of membrane wall tube screens and wear-resistant and refractory materials laid outside the tubes.

[0056] A fluidized heat exchange recycler, such as embodiment 1 and embodiment 3, wherein two separators correspond to one fluidized heat exchange recycler.

[0057] A fluidized heat exchange recirculator, such as embodiment 2 and embodiment 4, wherein a single separator corresponds to a single fluidized heat exchange recirculator.

[0058] A fluidized heat exchange recycler, such as Example 1 and Example 3, wherein the direct recycler zone and the heat exchange recycler zone share a descending section and a return section, that is, the first descending section and the second descending section are a common structure, and the first return section and the second return section are a common structure.

[0059] A fluidized heat exchange recirculator, such as in Examples 2 and 4, has a high-temperature return section and a low-temperature return section arranged independently. That is, the first and second return sections are independent structures, and the second return section includes a low-temperature ash return pipe 14, which is connected to the upper portion of the external bed heat exchange section.

[0060] The fluidized heat exchange recycler of the present application adopts an integrated design of a recycler and an external bed, and utilizes the U-valve recycler principle. By setting relevant partition walls, a direct recycler area and a heat exchange recycler area are formed. The circulating material has two routes in the recycler. The material quantity of the two routes is adjusted by separately controlling the fluidized air volume in the direct recycler area and the heat exchange recycler area, thereby adjusting the heat exchange rate of the heating surface. The system structure is simple in design and has good adjustment characteristics. At the same time, the external bed is reasonably arranged, which can meet the layout requirements of the high-temperature heating surface, can effectively solve the high-temperature corrosion problem of CFB boilers burning high-chlorine fuel, is conducive to achieving high parameters and large-scale boilers, and is feasible.

[0061] The aforementioned basic examples and their further selected examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed for protection in this application. In this application, each selected example can be arbitrarily combined with any other basic examples and selected examples.

[0062] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A fluidized heat exchange recirculator, comprising a direct recirculation zone and a heat exchange recirculation zone, characterized in that: The direct return material area includes a first descending section, an ascending section and a first return material section that are connected in sequence, and the heat exchange return material area includes a second descending section, a heat exchange ash quantity control section, an external bed heat exchange section and a second return material section that are connected in sequence. The first descending section and the second descending section are a common structure, and the first return material section and the second return material section are a common structure or an independent structure.

2. The fluidized heat exchange recirculator according to claim 1, characterized in that: One fluidized heat exchanger recycler corresponds to one separator, or one fluidized heat exchanger recycler corresponds to two separators.

3. The fluidized heat exchange recirculator according to claim 1, characterized in that: The common structure of the first descending section and the second descending section comprises a vertical pipe (1), a descending section valve body (2), a descending section air chamber (16) and a descending section air cap (19); the vertical pipe (1) is communicated with the upper part of the descending section valve body (2); the descending section air chamber (16) is located at the lower part of the descending section valve body (2); a descending section air cap (19) is provided on the distribution bin air distribution plate (21) in the descending section air chamber (16); and the lower part of the descending section valve body (2) is communicated with the lower part of the ascending section and the lower part of the heat exchange ash quantity control section respectively.

4. The fluidized heat exchange recirculator according to claim 1, characterized in that: The ascending section comprises an ascending section valve body (3), an ascending section air chamber (17) and an ascending section air cap (20); the lower part of the ascending section valve body (3) is communicated with the lower part of the first descending section; the ascending section air chamber (17) is located at the lower part of the ascending section valve body (3); an ascending section air cap (20) is provided on the distribution bin air distribution plate (21) in the ascending section air chamber (17); and the upper part of the ascending section valve body (3) is communicated with the upper part of the first return section.

5. The fluidized heat exchange recirculator according to claim 1, characterized in that: The first return section comprises a return section valve body (4) and a return pipe (5), the upper part of the return section valve body (4) is connected to the upper part of the rising section, and the lower part of the return section valve body (4) is connected to the return pipe (5).

6. The fluidized heat exchange recirculator according to claim 1, characterized in that: The heat exchange ash quantity control section comprises a heat exchange ash quantity control section valve body (6), a heat exchange ash quantity control section air chamber (15) and a heat exchange ash quantity control section air cap (18); the lower part of the heat exchange ash quantity control section valve body (6) is communicated with the lower part of the second descending section; the heat exchange ash quantity control section air chamber (15) is located at the lower part of the heat exchange ash quantity control section valve body (6); a heat exchange ash quantity control section air cap (18) is provided on the distribution bin air distribution plate (21) in the heat exchange ash quantity control section air chamber (15); and the upper part of the heat exchange ash quantity control section valve body (6) is communicated with the upper part of the external bed heat exchange section.

7. The fluidized heat exchange recirculator according to claim 1, characterized in that: The external bed heat exchange section includes a heat exchange bin (11), a heat exchange tube bundle (12), a heat exchange bin air chamber (22), a heat exchange bin hood (23) and a heat exchange bin air distribution plate (24). The upper part of the heat exchange bin (11) is connected to the upper part of the heat exchange ash quantity control section. The heat exchange bin (11) is provided with a heat exchange tube bundle (12) located at the upper part, the heat exchange bin air chamber (22) is located at the lower part of the heat exchange bin (11), and a heat exchange bin hood (23) is provided on the heat exchange bin air distribution plate (24) in the heat exchange bin air chamber (22).

8. The fluidized heat exchange recirculator according to claim 1, characterized in that: The first material return section and the second material return section are independent structures. The second material return section comprises a low-temperature ash return pipe (14), and the low-temperature ash return pipe (14) is connected to the upper part of the external bed heat exchange section.

9. The fluidized heat exchange recirculator according to any one of claims 1 to 8, characterized in that: The first descending section and the ascending section are separated by a first upper partition wall (7), and the ascending section and the first return section are separated by a first lower partition wall (9). There is a height difference H1 between the first upper wall lower edge (7-1) of the first upper partition wall (7) and the first lower wall upper edge (9-1) of the first lower partition wall (9), and H1 is 100 to 500 mm. The second descending section and the heat exchange ash quantity control section are separated by a second upper partition wall (8), the heat exchange ash quantity control section and the external bed heat exchange section are separated by a second lower partition wall (10), and the external bed heat exchange section and the second return material section are separated by a third lower partition wall (13). There is a step height H2 between the second upper wall lower edge (8-1) of the second upper partition wall (8) and the second lower wall upper edge (10-1) of the second lower partition wall (10), and H2 is 100 to 500 mm. The second lower partition wall (10) and the third lower partition wall (13) are of the same height.

10. The fluidized heat exchange recirculator according to claim 1, characterized in that: The descending section valve body (2) of the first descending section, the ascending section valve body (3) of the ascending section and the heat exchange ash quantity control section valve body (6) of the heat exchange ash quantity control section together constitute a material distribution bin, the heat exchange ash quantity control section air chamber (15) of the heat exchange ash quantity control section, the descending section air chamber (16) of the first descending section, the ascending section air chamber (17) of the ascending section and the heat exchange bin air chamber (22) of the external bed heat exchange section are all independent air chambers, the heat exchange ash quantity control section air hood (18), the descending section air hood (19) and the ascending section air hood (20) are arranged in sections on the distribution bin air distribution plate (21), and the heat exchange bin air distribution plate (24) is arranged at a height lower than the distribution bin air distribution plate (21).

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