Powder high-temperature gas-solid suspension reaction system

Abstract

The application provides a powder high-temperature gas-solid suspension reaction system, and belongs to the technical field of powder gas-solid reaction. The system comprises a powder gas-solid reaction tower, a gas-solid separation tower, a powder cooling tower and a heat exchanger. The powder gas-solid reaction tower is connected with the gas-solid separation tower through a connecting pipe. The hot powder material in the gas-solid separation tower is discharged to the powder cooling tower. The reaction gas in the gas-solid separation tower is discharged to the heat exchanger. After heat exchange, the reaction gas is discharged through a chimney or is recycled to the lower air chamber of the powder gas-solid reaction tower after reheating. The cooling gas in the powder cooling tower is discharged through the chimney. The system can realize the preparation of powder suspension state gas-solid reaction materials, effectively avoid the agglomeration and adhesion of powder, improve the reaction rate, realize high-temperature gas-solid separation and the recycling of reaction gas and waste heat.

Description

Technical Field

[0001] This invention relates to the field of powder gas-solid reaction technology, and in particular to a high-temperature powder gas-solid suspension reaction system. Background Technology

[0002] In modern industrial production, especially in chemical production, numerous gas-solid reaction processes exist. To improve product quality and production efficiency, ultrafine powder solid particles are often used to react with gases to prepare materials. However, due to the poor flowability of ultrafine powders, they are extremely prone to agglomeration, which can easily lead to melting and agglomeration during high-temperature gas-solid reactions, causing production slowdowns or even process disruption.

[0003] In response to this situation, the present invention designs a process and apparatus for heat treatment of ultrafine powders, which can effectively solve the problems that occur in the gas-solid reaction of powders. Summary of the Invention

[0004] This invention provides a high-temperature gas-solid suspension reaction system for powders.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] A high-temperature gas-solid suspension reaction system for powder includes a powder gas-solid reaction tower, a gas-solid separation tower, a powder cooling tower, and a heat exchanger.

[0007] The top of the powder gas-solid reaction tower is connected to a gas-solid separation tower via a connecting pipe.

[0008] The lower part of the gas-solid separation tower is connected to a powder cooling tower via a powder hot material pipeline, and the top of the gas-solid separation tower is connected to a heat exchanger via a gas pipeline. The heat exchanger includes heat exchanger one and heat exchanger two. The gas pipeline connected to the top of the gas-solid separation tower is divided into two branches: one branch connects to the upper air inlet of heat exchanger one, and the other branch connects to heat exchanger two.

[0009] The heat exchanger is connected to a fan at the bottom. The fan outlet pipe is connected to the heat exchanger and the chimney respectively. A valve five is installed on the fan outlet pipe connecting to the chimney. The fan inlet pipe is connected to the reaction gas source, and a valve four is installed on the reaction gas source and the fan inlet pipe.

[0010] The upper outlet of the heat exchanger is connected to the lower air chamber of the powder gas-solid reaction tower via a pipeline.

[0011] The gas outlet of the second heat exchanger is connected to the chimney, and valve six is ​​installed on the connecting pipe from the gas outlet of the second heat exchanger to the chimney.

[0012] The lower part of the powder gas-solid reaction tower is equipped with a sintered porous air distribution plate. The lower part of the sintered porous air distribution plate is the lower air chamber of the powder gas-solid reaction tower. An electric heating device is installed in the lower air chamber. The powder gas-solid two-phase flow feed pipe enters from the bottom of the powder gas-solid reaction tower and passes through the sintered porous air distribution plate. A valve is installed on the powder gas-solid two-phase flow feed pipe.

[0013] The upper part of the gas-solid separation tower is provided with a sintered porous filter plate, and the lower part of the gas-solid separation tower is provided with a sintered porous air distribution plate. The connecting pipe extends out of the sintered porous air distribution plate.

[0014] The top of the gas-solid separation tower is connected to a backflush gas pipeline, and a backflush valve is installed on the backflush gas pipeline.

[0015] The bottom of the gas-solid separation tower is connected to a reaction gas pipeline, and valve two is installed on the reaction gas pipeline;

[0016] Two discharge pipes extend from the upper part of the sintering porous air distribution plate of the gas-solid separation tower on the side wall of the gas-solid separation tower. Powder hot material discharge valve one and powder hot material discharge valve two are respectively installed on the two discharge pipes. The pipe where powder hot material discharge valve two is located is connected to the powder cooling tower.

[0017] The top of the powder cooling tower is connected to the chimney via a pipe, and the top of the powder cooling tower is connected to a backflush air pipe, on which a backflush valve 2 is installed.

[0018] The upper part of the powder cooling tower is provided with a sintered porous filter plate, and the lower part of the powder cooling tower is provided with a sintered porous air distribution plate.

[0019] The lower part of the sintered porous filter plate of the powder cooling tower is inserted into the powder hot material pipe.

[0020] A powder cold material discharge pipe is installed on the upper part of the sintering porous air distribution plate of the powder cooling tower, and a powder cold material discharge valve is installed on the powder cold material discharge pipe.

[0021] The bottom of the powder cooling tower is connected to a cooling gas pipe, and valve three is installed on the cooling gas pipe.

[0022] The powder gas-solid reaction tower is a closed container, and the outer wall of the container, from the inside to the outside, consists of refractory material, thermal insulation material and metal shell.

[0023] The gas-solid separation tower is a closed container, and the outer wall of the container, from the inside out, consists of refractory material, thermal insulation material, and a metal shell.

[0024] The powder cooling tower is a closed container, and the outer wall of the container consists of refractory material, thermal insulation material and metal shell from the inside out.

[0025] The heat exchanger 1 and heat exchanger 2 are indirect wall heat exchangers. The outer wall of the heat exchanger consists of refractory material, insulation material and metal shell from the inside to the outside. Heat exchanger 1 realizes gas-to-gas heat exchange and heat exchanger 2 realizes gas-to-water heat exchange.

[0026] The system reaction process includes the following steps:

[0027] S1. The raw material powder reaction gas enters the powder gas-solid reaction tower through the powder gas-solid two-phase flow feed pipe by pneumatic conveying.

[0028] S2. The powder entering the powder gas-solid reaction tower is heated by an electric heating device from the lower air chamber of the powder gas-solid reaction tower and enters through the sintered porous air distribution plate of the powder gas-solid reaction tower. The high-temperature reaction gas forms a suspended conveying state in the powder gas-solid reaction tower and completes the gas-solid reaction in the suspended conveying state.

[0029] S3. The gas-solid two-phase flow that has completed the reaction in the powder gas-solid reaction tower enters the gas-solid separation tower through the connecting pipe, and the powder is separated from the reaction gas through the sintered porous filter plate of the gas-solid separation tower.

[0030] The separated powder is discharged from the hot powder discharge valve and enters the next process.

[0031] Alternatively, the separated powder may be discharged from the hot powder discharge valve and enter the powder cooling tower;

[0032] S4. The powder entering the powder cooling tower is cooled by the ambient temperature cooling gas entering the powder cooling tower through valve three in a fluidized manner. The cooled powder is discharged through the powder cold material discharge valve. The heated cooling gas is filtered through the sintered porous filter plate of the powder cooling tower and discharged from the top of the powder cooling tower and discharged through the chimney.

[0033] S5. The reaction gas purified by the sintered porous filter plate of the gas-solid separation tower is discharged from the top of the tower. Part of it is returned to the first heat exchanger for heat recovery and cooling, and then reheated by the fan before entering the lower air chamber of the powder gas-solid reaction tower for recycling. The other part is discharged through the chimney after heat recovery by the second heat exchanger.

[0034] The backflush valves 1 and 2 at the top of the gas-solid separation tower and the powder cooling tower are opened periodically to perform periodic backflush cleaning of the sintered porous filter plates of the gas-solid separation tower and the powder cooling tower.

[0035] The valve six remains open and keeps the system at a positive pressure level.

[0036] The above technical solution has at least the following advantages compared with the existing technology:

[0037] In the above scheme, the powder is first transported to a powder gas-solid reaction tower via a high solid-to-gas ratio gas-solid two-phase flow. There, it mixes with high-temperature reaction gas that has been heated and enters the reaction zone from a sintered porous air distribution plate at the bottom of the tower. This mixture causes the gas velocity within the reaction tower to exceed the suspension velocity of the powder particles or their agglomerates, forming a suspended gas-solid reaction. The reacted powder particles, carried by the remaining reaction gas, enter a gas-solid separation tower, where high-temperature gas-solid separation is achieved through a sintered porous filter plate. The separated high-temperature powder then enters a powder cooling tower, where it is cooled in a fluidized state using ambient-temperature cooling gas. The reaction gas discharged from the system for its transport function is recycled and reused through reflux in a heat exchanger and its own heat exchange.

[0038] This system can prepare suspended gas-solid reactive materials of powder, effectively avoid powder agglomeration and adhesion, improve reaction rate, realize high-temperature gas-solid separation, and recycle reaction gas and waste heat. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of a high-temperature gas-solid suspension reaction system for powder according to the present invention.

[0041] The annotations in the attached figures are explained as follows:

[0042] 1-Powder gas-solid reaction tower; 101-Sintered porous air distribution plate for powder gas-solid reaction tower; 102-Electric heating device; 103-Powder gas-solid two-phase flow feed pipe; 104-Lower air chamber of powder gas-solid reaction tower; 105-Valve 1;

[0043] 2-Connecting pipe;

[0044] 3-Gas-solid separation tower; 301-Sintered porous filter plate of gas-solid separation tower; 302-Powder hot material discharge valve one; 303-Powder hot material discharge valve two; 304-Backflush valve one; 305-Sintered porous air distribution plate of gas-solid separation tower; 306-Valve two;

[0045] 4-Powder cooling tower; 401-Sintered porous filter plate for powder cooling tower; 402-Sintered porous air distribution plate for powder cooling tower; 403-Backflush valve II; 404-Powder cold material discharge valve; 405-Valve III;

[0046] 5-Heat exchanger one; 6-Fan; 7-Valve four; 8-Valve five; 9-Chimney; 10-Heat exchanger two; 11-Valve six. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0048] It should be noted that the terms "up", "down", "left", "right", "front", and "back" used in this invention are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0049] This invention provides a high-temperature gas-solid suspension reaction system for powders.

[0050] like Figure 1 As shown, the system includes a powder gas-solid reaction tower 1, a gas-solid separation tower 3, a powder cooling tower 4, and a heat exchanger.

[0051] The top of the powder gas-solid reaction tower 1 is connected to the gas-solid separation tower 3 via a connecting pipe 2;

[0052] The lower part of the gas-solid separation tower 3 is connected to the powder cooling tower 4 via a powder hot material pipeline, and the top of the gas-solid separation tower 3 is connected to a heat exchanger via a gas pipeline. The heat exchanger includes a first heat exchanger 5 and a second heat exchanger 10. The gas pipeline connected to the top of the gas-solid separation tower 3 is divided into two branches: one branch connects to the upper air inlet of the first heat exchanger 5, and the other branch connects to the second heat exchanger 10.

[0053] The lower part of the heat exchanger 5 is connected to the fan 6. The outlet pipe of the fan 6 is connected to the heat exchanger 5 and the chimney 9 respectively. A valve 8 is installed on the pipe connecting the outlet of the fan 6 to the chimney 9. The inlet pipe of the fan 6 is connected to the reaction gas source, and a valve 7 is installed on the pipe connecting the reaction gas source and the inlet of the fan 6.

[0054] The upper outlet of the heat exchanger 5 is connected to the lower air chamber 104 of the powder gas-solid reaction tower 1 via a pipeline.

[0055] The gas outlet of the heat exchanger 210 is connected to the chimney 9, and a valve 611 is installed on the connecting pipe from the gas outlet of the heat exchanger 210 to the chimney 9.

[0056] The lower part of the powder gas-solid reaction tower 1 is provided with a sintering porous air distribution plate 101. The lower part of the sintering porous air distribution plate 101 is the lower air chamber 104 of the powder gas-solid reaction tower. An electric heating device 102 is installed in the lower air chamber 104. The powder gas-solid two-phase flow feed pipe 103 enters from the bottom of the powder gas-solid reaction tower 1 and passes through the sintering porous air distribution plate 101. A valve 105 is installed on the powder gas-solid two-phase flow feed pipe 103.

[0057] The upper part of the gas-solid separation tower 3 is provided with a sintered porous filter plate 301, and the lower part of the gas-solid separation tower 3 is provided with a sintered porous air distribution plate 305. The connecting pipe 2 passes through the sintered porous air distribution plate 305.

[0058] The top of the gas-solid separation tower 3 is connected to a backflush gas pipeline, and a backflush valve 304 is installed on the backflush gas pipeline.

[0059] The bottom of the gas-solid separation tower 3 is connected to a reaction gas pipeline, and valve 306 is installed on the reaction gas pipeline.

[0060] Two discharge pipes are connected to the upper part of the sintering porous air distribution plate 305 on the side wall of the gas-solid separation tower 3. Powder hot material discharge valve one 302 and powder hot material discharge valve two 303 are respectively installed on the two discharge pipes. The pipe where powder hot material discharge valve two is located is connected to the powder cooling tower 4.

[0061] The top of the powder cooling tower 4 is connected to the chimney via a pipe, and the top of the powder cooling tower 4 is connected to a backflush gas pipe. A backflush valve 403 is installed on the backflush gas pipe.

[0062] The upper part of the powder cooling tower 4 is provided with a sintered porous filter plate 401, and the lower part of the powder cooling tower 4 is provided with a sintered porous air distribution plate 402.

[0063] The lower part of the sintered porous filter plate 401 in the powder cooling tower is inserted into the powder hot material pipe.

[0064] A powder cold material discharge pipe is installed on the upper part of the sintering porous air distribution plate 402 of the powder cooling tower, and a powder cold material discharge valve 404 is installed on the powder cold material discharge pipe.

[0065] The bottom of the powder cooling tower 4 is connected to a cooling gas pipe, and a valve 405 is installed on the cooling gas pipe.

[0066] The powder gas-solid reaction tower 1 is a closed container, and the outer wall of the container is composed of refractory material, heat insulation material and metal shell from the inside to the outside.

[0067] The gas-solid separation tower 3 is a closed container, and the outer wall of the container is composed of refractory material, heat insulation material and metal shell from the inside to the outside.

[0068] The powder cooling tower 4 is a closed container, and the outer wall of the container consists of refractory material, heat insulation material and metal shell from the inside to the outside.

[0069] The heat exchanger 5 and heat exchanger 10 are indirect heat exchangers, and the outer wall of the heat exchanger consists of refractory material, insulation material and metal shell from the inside to the outside.

[0070] The system reaction process includes the following steps:

[0071] S1. The raw material powder reaction gas enters the powder gas-solid reaction tower 1 through the powder gas-solid two-phase flow feed pipe 103 via pneumatic conveying.

[0072] S2. The powder entering the powder gas-solid reaction tower 1 is heated by the electric heating device 102 from the lower air chamber 104 of the powder gas-solid reaction tower and enters through the sintered porous air distribution plate 101 of the powder gas-solid reaction tower. The powder forms a suspended conveying state in the powder gas-solid reaction tower 1 and completes the gas-solid reaction in the suspended conveying state.

[0073] S3. The gas-solid two-phase flow that has completed the reaction in the powder gas-solid reaction tower 1 enters the gas-solid separation tower 3 through the connecting pipe 2, and the powder is separated from the reaction gas through the sintered porous filter plate 301 of the gas-solid separation tower.

[0074] The separated powder is discharged from the hot powder discharge valve 302 and enters the next process.

[0075] Alternatively, the separated powder is discharged from the hot powder discharge valve 303 and enters the powder cooling tower 4;

[0076] S4. The powder entering the powder cooling tower 4 is cooled by the ambient temperature cooling gas entering the powder cooling tower 4 through valve 3 405 in a fluidized manner. The cooled powder is discharged through the powder cold material discharge valve 404. The heated cooling gas is filtered through the sintered porous filter plate 401 of the powder cooling tower and discharged from the top of the powder cooling tower 4, and discharged through the chimney 9.

[0077] S5. The reaction gas purified by the sintered porous filter plate 301 of the gas-solid separation tower is discharged from the top of the tower. Part of it is returned to the heat exchanger 15 for heat recovery and cooling, and then reheated by the fan 6 before entering the lower air chamber 104 of the powder gas-solid reaction tower for recycling. The other part is discharged through the chimney 9 after heat recovery by the heat exchanger 2 10.

[0078] The following description, in conjunction with specific embodiments, illustrates this point.

[0079] In practical applications, the reaction process is as follows:

[0080] S1: Powder introduction

[0081] S11: The raw material silicon powder and the reaction gas are pneumatically conveyed into the powder gas-solid two-phase flow feed pipe and then into the powder gas-solid reaction tower.

[0082] S12: After the reaction gas is electrically heated to 1500℃, it is mixed with the powder conveying gas-solid two-phase flow through the sintered porous air distribution plate of the powder gas-solid reaction tower. The average flow velocity after mixing is greater than the free settling velocity of the powder.

[0083] S13: The powder completes the gas-solid reaction in the gas-solid reaction tower and enters the gas-solid separation tower through the connecting pipe.

[0084] S2: The powder is separated into gas and solid phases by filtration through a sintered porous filter plate in the gas-solid separation tower. After separation, the powder either passes through a hot powder discharge valve and enters the next process that requires high-temperature powder as raw material, or it enters a powder cooling tower for cooling.

[0085] S3: The powder entering the powder cooling tower is cooled by room temperature cooling gas from the bottom of the tower in a fluidized manner. The cooled powder is discharged as a product through the powder cold material discharge valve. The heated cooling gas is filtered by the sintered porous filter plate of the cooling tower and discharged from the top of the tower through the chimney.

[0086] S4: The reaction gas discharged from the top of the gas-solid separation tower enters the gas heat exchanger, recovers heat and cools down, and then returns to heat exchanger one via a fan for reheating before entering the lower air chamber of the powder gas-solid reaction tower for recycling; the cooling water entering heat exchanger two exchanges heat with the reaction gas and recovers heat in the form of hot water or steam.

[0087] S5: The top of the gas-solid separation tower and the powder cooling tower are respectively equipped with back-blowing valves to regularly back-blow and clean their respective porous filter plates;

[0088] S6: Valve six is ​​kept at a certain opening to keep the system at a positive pressure level.

[0089] The following points need to be explained:

[0090] (1) The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention. Other structures can refer to the general design.

[0091] (2) Where there is no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0092] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-temperature gas-solid suspension reaction system for powders, characterized in that, Includes a powder gas-solid reaction tower, a gas-solid separation tower, a powder cooling tower, and a heat exchanger. The top of the powder gas-solid reaction tower is connected to a gas-solid separation tower via a connecting pipe. The lower part of the gas-solid separation tower is connected to a powder cooling tower via a powder hot material pipeline, and the top of the gas-solid separation tower is connected to a heat exchanger via a gas pipeline. The heat exchanger includes heat exchanger one and heat exchanger two. The gas pipeline connected to the top of the gas-solid separation tower is divided into two branches: one branch connects to the upper air inlet of heat exchanger one, and the other branch connects to heat exchanger two. The heat exchanger is connected to a fan at the bottom. The fan outlet pipe is connected to the heat exchanger and the chimney respectively. A valve five is installed on the fan outlet pipe connecting to the chimney. The fan inlet pipe is connected to the reaction gas source, and a valve four is installed on the reaction gas source and the fan inlet pipe. The upper outlet of the heat exchanger is connected to the lower air chamber of the powder gas-solid reaction tower via a pipeline. The gas outlet of the second heat exchanger is connected to the chimney, and valve six is ​​installed on the connecting pipe from the gas outlet of the second heat exchanger to the chimney; The upper part of the gas-solid separation tower is provided with a sintered porous filter plate, and the lower part of the gas-solid separation tower is provided with a sintered porous air distribution plate. The connecting pipe extends out of the sintered porous air distribution plate. The top of the gas-solid separation tower is connected to a backflush gas pipeline, and a backflush valve is installed on the backflush gas pipeline. The bottom of the gas-solid separation tower is connected to a reaction gas pipeline, and valve two is installed on the reaction gas pipeline; Two discharge pipes extend from the upper part of the sintering porous air distribution plate of the gas-solid separation tower on the side wall of the gas-solid separation tower. Powder hot material discharge valve one and powder hot material discharge valve two are respectively installed on the two discharge pipes. The pipe where powder hot material discharge valve two is located is connected to the powder cooling tower.

2. The high-temperature gas-solid suspension reaction system for powder according to claim 1, characterized in that, The lower part of the powder gas-solid reaction tower is equipped with a sintered porous air distribution plate. The lower part of the sintered porous air distribution plate is the lower air chamber of the powder gas-solid reaction tower. An electric heating device is installed in the lower air chamber. The powder gas-solid two-phase flow feed pipe enters from the bottom of the powder gas-solid reaction tower and passes through the sintered porous air distribution plate. A valve is installed on the powder gas-solid two-phase flow feed pipe.

3. The high-temperature gas-solid suspension reaction system for powder according to claim 1, characterized in that, The top of the powder cooling tower is connected to the chimney via a pipe, and the top of the powder cooling tower is connected to a backflush air pipe, on which a backflush valve 2 is installed. The upper part of the powder cooling tower is provided with a sintered porous filter plate, and the lower part of the powder cooling tower is provided with a sintered porous air distribution plate. The lower part of the sintered porous filter plate of the powder cooling tower is inserted into the powder hot material pipe. A powder cold material discharge pipe is installed on the upper part of the sintering porous air distribution plate of the powder cooling tower, and a powder cold material discharge valve is installed on the powder cold material discharge pipe. The bottom of the powder cooling tower is connected to a cooling gas pipe, and valve three is installed on the cooling gas pipe.

4. The high-temperature gas-solid suspension reaction system for powder according to claim 1, characterized in that, The powder gas-solid reaction tower is a closed container, and the outer wall of the container, from the inside to the outside, consists of refractory material, thermal insulation material and metal shell. The gas-solid separation tower is a closed container, and the outer wall of the container, from the inside out, consists of refractory material, thermal insulation material, and a metal shell. The powder cooling tower is a closed container, and the outer wall of the container consists of refractory material, thermal insulation material and metal shell from the inside out.

5. The high-temperature gas-solid suspension reaction system for powder according to claim 1, characterized in that, The heat exchanger 1 and heat exchanger 2 are indirect wall heat exchangers, and the outer wall of the heat exchanger consists of refractory material, insulation material and metal shell from the inside to the outside.

6. The high-temperature gas-solid suspension reaction system for powder according to claim 1, characterized in that, The system reaction process includes the following steps: S1. The raw material powder reaction gas enters the powder gas-solid reaction tower through the powder gas-solid two-phase flow feed pipe by pneumatic conveying. S2. The powder entering the powder gas-solid reaction tower is heated by an electric heating device from the lower air chamber of the powder gas-solid reaction tower and enters through the sintered porous air distribution plate of the powder gas-solid reaction tower. The high-temperature reaction gas forms a suspended conveying state in the powder gas-solid reaction tower and completes the gas-solid reaction in the suspended conveying state. S3. The gas-solid two-phase flow that has completed the reaction in the powder gas-solid reaction tower enters the gas-solid separation tower through the connecting pipe, and the powder is separated from the reaction gas through the sintered porous filter plate of the gas-solid separation tower. The separated powder is discharged from the hot powder discharge valve and enters the next process. Alternatively, the separated powder may be discharged from the hot powder discharge valve and enter the powder cooling tower; S4. The powder entering the powder cooling tower is cooled by the ambient temperature cooling gas entering the powder cooling tower through valve three in a fluidized manner. The cooled powder is discharged through the powder cold material discharge valve. The heated cooling gas is filtered through the sintered porous filter plate of the powder cooling tower and discharged from the top of the powder cooling tower and discharged through the chimney. S5. The reaction gas purified by the sintered porous filter plate of the gas-solid separation tower is discharged from the top of the tower. Part of it is returned to the first heat exchanger for heat recovery and cooling, and then reheated by the fan before entering the lower air chamber of the powder gas-solid reaction tower for recycling. The other part is discharged through the chimney after heat recovery by the second heat exchanger.

7. The high-temperature gas-solid suspension reaction system for powder according to claim 6, characterized in that, The backflush valves 1 and 2 at the top of the gas-solid separation tower and the powder cooling tower are opened periodically to perform periodic backflush cleaning of the sintered porous filter plates of the gas-solid separation tower and the powder cooling tower.

8. The high-temperature gas-solid suspension reaction system for powder according to claim 1, characterized in that, The valve six is ​​kept open to maintain the system at a positive pressure level.

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