A steam autoclave exhaust recovery system for autoclaved aerated concrete panel production

Abstract

The utility model belongs to the autoclave steam recovery field of autoclaved aerated concrete board production, concretely, relate to a kind of autoclave steam recovery system of autoclaved aerated concrete board production using autoclave. By first half tank module and second half tank module linear arrangement filter cover, filter cover can filter mixed high pressure steam in autoclave body, reduce the content of small particle in mixed high pressure steam, to avoid water vapor and small particle mixing in heat exchange component as far as possible, cause the situation of heat exchange component blockage to occur. In this way, it solves the problem that the existing aerated concrete autoclave waste heat utilization device may cause the working efficiency of the aerated concrete autoclave waste heat utilization device to be reduced due to the presence of small particles in the steam.

Description

Technical Field

[0001] This utility model belongs to the field of exhaust steam recovery in autoclaves used in the production of autoclaved aerated concrete panels. Specifically, it relates to an exhaust steam recovery system for autoclaves used in the production of autoclaved aerated concrete panels. Background Technology

[0002] Autoclaved aerated concrete (AAC) is a revolutionary building material, unlike traditional concrete. Its core characteristics lie in "aeration" and "autoclaving": Aeration: During the manufacturing process, countless tiny, independent, and closed air bubbles are generated within the slurry through a chemical reaction, giving it an internal structure similar to a "bread" or "sponge." Autoclaving: The formed blocks are placed in an autoclave and cured for an extended period under high temperature (typically around 180-200°C) and high-pressure saturated steam. This process endows AAC with high strength, excellent stability, and durability. The main components commonly used in autoclaved aerated concrete (AAC) include siliceous materials (such as fly ash, sand, and tailings), calcareous materials (such as cement and lime), foaming agents, and water. The production process generally involves grinding the siliceous and calcareous raw materials separately, then mixing them with water in a precise ratio to form a slurry. The slurry is then poured and aerated: aluminum powder is added to the mold, and hydrogen gas is generated by the reaction of the aluminum powder with the alkaline slurry, causing the slurry to expand rapidly and form a porous structure. The porous concrete is then autoclaved.

[0003] Chinese utility model patent CN202420959603.3 discloses a waste heat recovery device for autoclaved aerated concrete (AAC) reactors, including a water storage tank. Water exchange valves are fixedly connected to the top and bottom of the water storage tank. A high-efficiency heat exchange mechanism is installed on the inner wall and top of the water storage tank. A moving mechanism is installed on the outer wall of the water storage tank. The high-efficiency heat exchange mechanism includes a drive motor and a heat exchange tube. The drive motor is fixedly installed at the center of the top of the water storage tank, and its output shaft extends into the inner cavity of the water storage tank and is fixedly connected to a rotating square shaft. This utility model, through the design of the drive motor, can drive the rotating square shaft to rotate within the inner cavity of the water storage tank, simultaneously driving the stirring blades to rotate and agitate the water in the inner cavity. This increases the contact rate between the water and the outer surface of the heat exchange tube, improving the heating effect of steam on the water and thus increasing the heat recovery effect. However, autoclaved concrete is typically composed of fine particles. During the autoclaving process, the gas inside the autoclaved concrete expands, which may cause some of these fine particles to detach from the surface. When the pressure inside the autoclave suddenly decreases, these smaller particles may flow into the heat exchange tubes along with the high-pressure steam. As the high-pressure steam releases heat and cools down in the heat exchange tubes, it is easy for water droplets to form and mix with the fine particles. Over time, this can cause blockage of the heat exchange tubes, leading to a decrease in the efficiency of the autoclave waste heat recovery device. Utility Model Content

[0004] To address the problem that existing autoclave waste heat recovery devices for aerated concrete (AAC) may suffer reduced efficiency due to fine particulate matter in the steam, this invention provides a waste steam recovery system for autoclaves used in the production of autoclaved aerated concrete (AAC) panels, comprising: Autoclave body; An impurity separation assembly includes a first half-tank module, a second half-tank module, a filter cover, a mixed gas input pipe, a steam output pipe, and a first valve body. The first half-tank module and the second half-tank module are detachably and fixedly connected. The first half-tank module and the second half-tank module together form a tank with an internal cavity. The first half-tank module and the second half-tank module respectively abut against the filter cover. The filter cover is located between the first half-tank module and the second half-tank module. The filter cover divides the cavity between the first half-tank module and the second half-tank module into two connected regions. One end of the mixed gas input pipe is connected to the autoclave body, and the other end is connected to the second half-tank module. The first valve body is connected to the mixed gas input pipe. One end of the steam output pipe is connected to the first half-tank module. A heat exchange component; the heat exchange component is connected to the end of the steam output pipe furthest from the first half-tank module.

[0005] In some embodiments, the first half-tank module includes a first half-tank body, a miscellaneous gas discharge pipe, and a second valve body; the open end of the first half-tank body is detachably and fixedly connected to the second half-tank module; the open end of the first half-tank body abuts against the filter cover; the miscellaneous gas discharge pipe is connected to the end of the first half-tank body away from the second half-tank module; the second valve body is connected to the miscellaneous gas discharge pipe; the end of the steam output pipe away from the heat exchange component is connected to the peripheral wall of the first half-tank body; the connection point between the steam output pipe and the first half-tank body is located between the miscellaneous gas discharge pipe and the open end of the first half-tank body.

[0006] In some embodiments, the second half-tank unit includes a second half-tank body, an impurity discharge pipe, and a third valve body; the open end of the second half-tank body is detachably and fixedly connected to the open end of the first half-tank body; the end of the filter cover away from the first half-tank body abuts against the second half-tank body; the impurity discharge pipe communicates with the end of the second half-tank body away from the filter cover; the third valve body is connected to the impurity discharge pipe; the end of the mixed gas input pipe away from the autoclave body communicates with the peripheral wall of the second half-tank body; and multiple support rods are connected to the end of the second half-tank body away from the filter cover.

[0007] In some embodiments, the heat exchange assembly includes a heat exchange tank, a steam inlet pipe, multiple heat exchange tubes, a baffle unit, a cooling gas outlet pipe, a water inlet pipe, a water outlet pipe, and a fourth valve body; one end of the steam inlet pipe is connected to the heat exchange tubes, and the other end is connected to the steam inlet pipe; the cooling gas outlet pipe is connected to the end of the heat exchange tank away from the steam inlet pipe; the fourth valve body is connected to the cooling gas outlet pipe; the baffle unit includes a first baffle, a second baffle, and a third baffle; the outer peripheral surfaces of the first baffle and the third baffle are respectively fixedly connected to the inner peripheral surface of the heat exchange tank; a portion of the outer peripheral surface of the second baffle is fixedly connected to the inner peripheral surface of the heat exchange tank; the first baffle, the second baffle, and the third baffle are sequentially arranged in a straight line from one end near the steam inlet pipe. The heat exchange tubes are spaced apart and extend towards one end of the cooling gas output pipe; the outer circumferential surfaces of the heat exchange tubes are respectively sealed and connected to the first partition, the second partition, and the third partition; the axial direction of the heat exchange tubes is the same as the direction in which the first partition, the second partition, and the third partition are spaced apart; adjacent heat exchange tubes are spaced apart; one end of the heat exchange tube along its axial direction is connected to the steam input pipe, and the other end is connected to the cooling gas output pipe; adjacent heat exchange tubes are spaced apart; the water outlet pipe is connected to the peripheral wall of the heat exchange tank; the water inlet pipe is located between the first partition and the second partition; the water outlet pipe is connected to the outer wall of the heat exchange tank; the water outlet pipe is located between the second partition and the third partition; the water inlet pipe is vertically located above the water outlet pipe.

[0008] In some embodiments, there are multiple second partitions, and adjacent second partitions are spaced apart in a straight line from near the first partition to away from the first partition; the second partitions are offset from the inner wall of the heat exchange tank in a vertical direction from near the first partition to away from the first partition; the channels of the second partitions communicating with the inner wall of the heat exchange tank from one end near the first partition to one end away from the second partition are wavy in a vertical direction.

[0009] In some embodiments, the heat exchange tube includes a tube body, a plurality of grooves, and a plurality of protrusions; the grooves are recessed inward from the outer surface of the tube body along the radial direction of the tube body; the protrusions are protruding inward from the inner surface of the tube body along the radial direction of the tube body; the grooves are spaced apart along the axial direction of the tube body; the protrusions are spaced apart along the axial direction of the tube body.

[0010] In some embodiments, the grooves are spaced apart circumferentially along the tube body; the protrusions are spaced apart circumferentially along the tube body.

[0011] To address the problem that existing waste heat recovery devices for aerated concrete autoclaves may suffer reduced efficiency due to fine particulate matter in the steam, this invention offers the following advantages: By setting a filter cover in a straight line between the first half-tank module and the second half-tank module, the filter cover can filter the mixed high-pressure steam in the autoclave body, reduce the content of fine particles in the mixed high-pressure steam, and thus avoid the occurrence of water vapor and fine particles mixed in the heat exchange components, which could cause blockage of the heat exchange components. Attached Figure Description

[0012] Figure 1 A schematic diagram of the exhaust steam recovery system of an autoclave used in the production of autoclaved aerated concrete panels; Figure 2 A three-dimensional structural diagram of a waste steam recovery system for an autoclave used in the production of autoclaved aerated concrete panels; Figure 3 This is a schematic diagram of the three-dimensional structure of the separated components; Figure 4 for Figure 3 Partial diagram of the explosion; Figure 5 This is a schematic diagram of the planar structure of the heat exchange component; Figure 6 for Figure 5 Cross-sectional view along the AA direction; Figure 7 for Figure 6 A magnified view of a portion of point A in the middle.

[0013] In the diagram: 100 - Impurity separation component; 110 - Impurity separation unit; 111 - First half-tank module; 1111 - First half-tank body; 1112 - Impurity exhaust pipe; 1113 - Second valve body; 112 - Second half-tank module; 1121 - Second half-tank body; 1122 - Impurity discharge pipe; 1123 - Third valve body; 113 - Filter cover; 120 - Mixed gas input pipe; 130 - Steam output pipe; 14 0-First valve body; 200-Heat exchange assembly; 210-Heat exchange tank; 220-Steam input pipe; 230-Heat exchange tube; 231-Pipe body; 232-Groove; 233-Protrusion; 240-Baffle unit; 241-First baffle; 242-Second baffle; 243-Third baffle; 250-Cooling gas output pipe; 260-Water inlet pipe; 270-Water outlet pipe; 280-Fourth valve body; 300-Autoclave body. Detailed Implementation

[0014] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0015] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0016] This embodiment discloses a waste steam recovery system for autoclaves used in the production of autoclaved aerated concrete (AAC) panels, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, it may include: Autoclave body 300; An impurity separation assembly 100 includes a first half-tank module 111, a second half-tank module 112, a filter cover 113, a mixed gas inlet pipe 120, a steam outlet pipe 130, and a first valve body 140. The first half-tank module 111 and the second half-tank module 112 are detachably and fixedly connected. The first half-tank module 111 and the second half-tank module 112 together form a tank with an internal cavity. The first half-tank module 111 and the second half-tank module 112 respectively abut against the filter cover 113. The filter cover 113 is located between the first half-tank module 111 and the second half-tank module 112; the filter cover 113 divides the cavity between the first half-tank module 111 and the second half-tank module 112 into two connected areas; one end of the mixed gas input pipe 120 is connected to the autoclave body 300, and the other end is connected to the second half-tank module 112; the first valve body 140 is connected to the mixed gas input pipe 120; one end of the steam output pipe 130 is connected to the first half-tank module 111; Heat exchange component 200; the heat exchange component 200 is connected to the end of the steam output pipe 130 away from the first half-tank module 111.

[0017] In this embodiment, by linearly arranging the filter cover 113 between the first half-tank module 111 and the second half-tank module 112, the filter cover 113 can filter the mixed high-pressure steam within the autoclave body 300, reducing the content of fine particles in the mixed high-pressure steam, thereby minimizing the possibility of water vapor and fine particles mixing within the heat exchange component 200, which could cause blockage of the heat exchange component 200. In this embodiment, the filter cover 113 can be made of a metal mesh and a canvas with a certain degree of breathability; it can be understood that the canvas is fixed to the metal mesh to form the filter cover 113. In this embodiment, corresponding partitions are provided on the second half-tank module 112, enabling the second half-tank module 112 to restrict the dust cover from falling. The pressure in the first half-tank module 111 is low, and the position of the filter cover 113 can be fixed relative to the first half-tank module 111 and the second half-tank module 112. In this embodiment, the connection between the first half-tank module 111 and the second half-tank module 112 is sealed. In this embodiment, the first valve body 140 can be a gate valve that can be manually opened or closed, or a solenoid valve electrically connected to an external controller (not shown in the figure). The opening and closing of the solenoid valve can be controlled by the external controller. In this embodiment, the controller can be a PLC controller. In this embodiment, the autoclave body 300 is an application of existing conventional technology, so its structure is not specifically described in this embodiment.

[0018] In some embodiments of this utility model, such as Figure 2 , Figure 3 , Figure 4 As shown, the first half-tank module 111 includes a first half-tank body 1111, a miscellaneous gas discharge pipe, and a second valve body 1113; the open end of the first half-tank body 1111 is detachably and fixedly connected to the second half-tank module 112; the open end of the first half-tank body 1111 abuts against the filter cover 113; the miscellaneous gas discharge pipe is connected to the end of the first half-tank body 1111 away from the second half-tank module 112; the second valve body 1113 is connected to the miscellaneous gas discharge pipe; the end of the steam output pipe 130 away from the heat exchange component 200 is connected to the peripheral wall of the first half-tank body 1111; the connection between the steam output pipe 130 and the first half-tank body 1111 is located between the miscellaneous gas discharge pipe and the open end of the first half-tank body 1111.

[0019] In this embodiment, since the filtered steam may still contain some lighter gases, such as hydrogen, in order to further improve the utilization effect of the steam, the filtered steam can be further purified. For example, a gas discharge pipe can be provided at the upper part of the first half-tank body 1111, and a second valve body 1113 can be provided on the gas discharge pipe. Since hydrogen is lighter, it can gather at the upper part of the first half-tank body 1111. By appropriately opening the second valve body 1113, the mixed steam discharged from the autoclave body 300 can be filtered while hydrogen can be discharged. In this embodiment, the purer steam after filtration can enter the heat exchange component 200 through the steam output pipe 130.

[0020] In some embodiments of this utility model, such as Figure 2 , Figure 3 , Figure 4 As shown, the second half-tank unit includes a second half-tank body 1121, an impurity discharge pipe 1122, and a third valve body 1123; the open end of the second half-tank body 1121 is detachably and fixedly connected to the open end of the first half-tank body 1111; the end of the filter cover 113 away from the first half-tank body 1111 abuts against the second half-tank body 1121; the impurity discharge pipe 1122 communicates with the end of the second half-tank body 1121 away from the filter cover 113; the third valve body 1123 is connected to the impurity discharge pipe 1122; the end of the mixed gas input pipe 120 away from the autoclave body 300 communicates with the peripheral wall of the second half-tank body 1121; multiple support rods are connected to the end of the second half-tank body 1121 away from the filter cover 113.

[0021] In this embodiment, it is conceivable that the filtered fine particles are very likely to fall off under the action of gravity. By setting the impurity discharge pipe 1122 and the third valve body 1123, the third valve body 1123 can be opened within a predetermined time to discharge the fine particles. In this embodiment, the first half tank body 1111, the second half tank body 1121, the mixed gas input pipe 120, the steam output pipe 130, and the heat exchange component 200 are all insulated to minimize the loss of steam heat.

[0022] In some embodiments of this utility model, such as Figure 2 , Figure 5 , Figure 6 As shown, the heat exchange assembly 200 includes a heat exchange tank 210, a steam inlet pipe 220, multiple heat exchange tubes 230, a baffle unit 240, a cooling gas outlet pipe 250, a water inlet pipe 260, a water outlet pipe 270, and a fourth valve body 280. One end of the steam inlet pipe 220 is connected to the heat exchange tubes 230, and the other end is connected to the steam inlet pipe 240. The cooling gas outlet pipe 250 is connected to the end of the heat exchange tank 210 away from the steam inlet pipe 220. The fourth valve body 280 is connected to the cooling gas outlet pipe 250. A warm gas output pipe 250 is connected; the partition unit 240 includes a first partition 241, a second partition 242, and a third partition 243; the outer peripheral surfaces of the first partition 241 and the third partition 243 are respectively fixedly connected to the inner peripheral surface of the heat exchange tank 210; a portion of the outer peripheral surface of the second partition 242 is fixedly connected to the inner peripheral surface of the heat exchange tank 210; the first partition 241, the second partition 242, and the third partition 243 are sequentially connected from one end near the steam input pipe 220 along... The heat exchange tubes 230 are spaced apart in a straight line to one end of the cooling gas output pipe 250; the outer circumferential surfaces of the heat exchange tubes 230 are respectively sealed and connected to the first partition 241, the second partition 242, and the third partition 243; the axial direction of the heat exchange tubes 230 is the same as the direction in which the first partition 241, the second partition 242, and the third partition 243 are spaced apart; adjacent heat exchange tubes 230 are spaced apart; one end of the heat exchange tube 230 along its axial direction is connected to the steam input pipe 220, and the other end... One end is connected to the cooling gas output pipe 250; two adjacent heat exchange pipes 230 are spaced apart; the water outlet pipe 270 is connected to the peripheral wall of the heat exchange tank 210; the water inlet pipe 260 is located between the first partition 241 and the second partition 242; the water outlet pipe 270 is connected to the outer wall of the heat exchange tank 210; the water outlet pipe 270 is located between the second partition 242 and the third partition 243; the water inlet pipe 260 is vertically located above the water outlet pipe 270. There are multiple second partitions 242, and adjacent second partitions 242 are spaced apart in a straight line from near the first partition 241 to away from the first partition 241; the second partitions 242 are staggered and spaced apart from the inner wall of the heat exchange tank 210 in the vertical direction from near the first partition 241 to away from the first partition 241; the channels of the second partitions 242 communicating with the inner wall of the heat exchange tank 210 from one end near the first partition 241 to one end away from the second partition 242 are wavy in the vertical direction; The heat exchange tube 230 includes a tube body 231, a plurality of grooves 232, and a plurality of protrusions 233; the grooves 232 are recessed inward from the outer surface of the tube body 231 along the radial direction; the protrusions 233 protrude inward from the inner surface of the tube body 231 along the radial direction; the grooves 232 are spaced apart along the axial direction of the tube body 231; the protrusions 233 are spaced apart along the axial direction of the tube body 231; the grooves 232 are spaced apart circumferentially along the tube body 231; the protrusions 233 are spaced apart circumferentially along the tube body 231.

[0023] In this embodiment, by setting multiple grooves 232, the contact area between water and the pipe body 231 can be increased, which is conducive to heating the water more quickly. By setting multiple protrusions 233, the high-temperature steam can generate a certain disturbance when flowing in the pipe body 231, thereby achieving faster heating of the pipe body 231 and thus faster heating of the water. In this embodiment, the fourth valve body 280 can make the cooling gas in the cooling gas output pipe 250 discharged from the cooling gas output pipe 250 at a certain speed. The first valve body 140, the second valve body 1113, and the fourth valve body 280 can be adjusted according to the actual situation, so that the cavity between the first half-tank body 1111 and the second half-tank body 1121 forms a relatively stable airflow, and the pipe body 231 forms a relatively stable airflow, ultimately achieving a relatively stable water heating state. In this embodiment, external water enters the heat exchange tank 210 from the inlet pipe 260, and is then discharged from the outlet pipe 270 after being heated by steam.

[0024] The second valve body 1113, the third valve body 1123, and the fourth valve body 280 mentioned above can be gate valves or ball valves that can be opened manually, and the opening degree of each valve body can be set as needed.

[0025] The working principle of this utility model is as follows: By opening the first valve body 140, the second valve body 1113, and the fourth valve body 280, the exhaust steam (mixed high-temperature steam) in the autoclave body 300 enters the second half-tank body 1121 through the mixed gas inlet pipe 120. The mixed high-temperature gas is filtered by the filter cover 113, and the high-temperature steam enters the steam inlet pipe 220 through the steam outlet pipe 130. It is best to enter the heat exchange pipe 230 to heat the water in the heat exchange tank 210. The resulting cooling gas is discharged through the cooling gas outlet pipe 250.

[0026] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of this disclosure.

Claims

1. A system for recovering exhaust steam from an autoclave used in the production of autoclaved aerated concrete (AAC) panels, characterized in that, include: Autoclave body; An impurity separation assembly includes a first half-tank module, a second half-tank module, a filter cover, a mixed gas input pipe, a steam output pipe, and a first valve body. The first half-tank module and the second half-tank module are detachably and fixedly connected. The first half-tank module and the second half-tank module together form a tank with an internal cavity. The first half-tank module and the second half-tank module respectively abut against the filter cover. The filter cover is located between the first half-tank module and the second half-tank module. The filter cover divides the cavity between the first half-tank module and the second half-tank module into two connected regions. One end of the mixed gas input pipe is connected to the autoclave body, and the other end is connected to the second half-tank module. The first valve body is connected to the mixed gas input pipe. One end of the steam output pipe is connected to the first half-tank module. A heat exchange component; the heat exchange component is connected to the end of the steam output pipe furthest from the first half-tank module.

2. The autoclave exhaust steam recovery system for autoclaved aerated concrete (AAC) slab production according to claim 1, characterized in that, The first half-tank module includes a first half-tank body, a miscellaneous gas discharge pipe, and a second valve body; the open end of the first half-tank body is detachably and fixedly connected to the second half-tank module; the open end of the first half-tank body abuts against the filter cover; the miscellaneous gas discharge pipe is connected to the end of the first half-tank body away from the second half-tank module; the second valve body is connected to the miscellaneous gas discharge pipe; the end of the steam output pipe away from the heat exchange component is connected to the peripheral wall of the first half-tank body; the connection point between the steam output pipe and the first half-tank body is located between the miscellaneous gas discharge pipe and the open end of the first half-tank body.

3. The autoclave exhaust steam recovery system for autoclaved aerated concrete (AAC) slab production according to claim 2, characterized in that, The second half-tank module includes a second half-tank body, an impurity discharge pipe, and a third valve body; the open end of the second half-tank body is detachably and fixedly connected to the open end of the first half-tank body; the end of the filter cover away from the first half-tank body abuts against the second half-tank body; the impurity discharge pipe is connected to the end of the second half-tank body away from the filter cover; the third valve body is connected to the impurity discharge pipe; the end of the mixed gas input pipe away from the autoclave body is connected to the peripheral wall of the second half-tank body; multiple support rods are connected to the end of the second half-tank body away from the filter cover.

4. The autoclave exhaust steam recovery system for autoclaved aerated concrete (AAC) slab production according to claim 3, characterized in that, The heat exchange assembly includes a heat exchange tank, a steam input pipe, multiple heat exchange pipes, a baffle unit, a cooling gas output pipe, a water inlet pipe, a water outlet pipe, and a fourth valve body. One end of the steam input pipe is connected to the heat exchange pipes, and the other end is also connected to the steam input pipe. The cooling gas output pipe is connected to the end of the heat exchange tank furthest from the steam input pipe. The fourth valve body is connected to the cooling gas output pipe. The baffle unit includes a first baffle, a second baffle, and a third baffle. The outer circumferential surfaces of the first and third baffles are respectively fixedly connected to the inner circumferential surface of the heat exchange tank. A portion of the outer circumferential surface of the second baffle is fixedly connected to the inner circumferential surface of the heat exchange tank. The first, second, and third baffles sequentially extend from the end closest to the steam input pipe. The heat exchange tubes are spaced apart along a straight line to one end of the cooling gas output pipe; the outer circumferential surface of the heat exchange tubes is sealed and connected to the first partition, the second partition, and the third partition respectively; the axial direction of the heat exchange tubes is the same as the direction in which the first partition, the second partition, and the third partition are spaced apart; one end of the heat exchange tube along its axial direction is connected to the steam input pipe, and the other end is connected to the cooling gas output pipe; adjacent heat exchange tubes are spaced apart; the water outlet pipe is connected to the peripheral wall of the heat exchange tank; the water inlet pipe is located between the first partition and the second partition; the water outlet pipe is connected to the outer wall of the heat exchange tank; the water outlet pipe is located between the second partition and the third partition; the water inlet pipe is vertically located above the water outlet pipe.

5. The autoclave exhaust steam recovery system for autoclaved aerated concrete (AAC) slab production according to claim 4, characterized in that, There are multiple second partitions, and adjacent second partitions are spaced apart in a straight line from near the first partition to away from the first partition; the second partitions are staggered and spaced apart from the inner wall of the heat exchange tank in the vertical direction from near the first partition to away from the first partition; the channels of the second partitions communicating with the inner wall of the heat exchange tank from one end near the first partition to the other end away from the second partition are wavy in the vertical direction.

6. The autoclave exhaust steam recovery system for autoclaved aerated concrete (AAC) slab production according to claim 5, characterized in that, The heat exchange tube includes a tube body, multiple grooves, and multiple protrusions; the grooves are recessed inward from the outer surface of the tube body along the radial direction; the protrusions are protruding inward from the inner surface of the tube body along the radial direction; the grooves are spaced apart along the axial direction of the tube body; the protrusions are spaced apart along the axial direction of the tube body.

7. The autoclave exhaust steam recovery system for autoclaved aerated concrete (AAC) slab production according to claim 6, characterized in that, The grooves are spaced apart circumferentially along the tube body; the protrusions are spaced apart circumferentially along the tube body.

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