A heat exchange, white elimination and odor removal system for steam exhaust of aerated concrete autoclaving

Abstract

The application is a heat exchange white elimination and odor removal system for steam raising of aerated concrete, which comprises autoclave group, spray tower, transfer water tank, heat exchange condensation working group, high temperature water tank and domestic water storage tank. The working process of the application is heat exchange-condensation-spray cooling-reheating, in which the heat exchange step can reduce the temperature of the steam from 160 degrees to 80 degrees, so as to convert the heat energy to the heating of soft water, and the soft water supplied to the pot is heated from 30 degrees to 95-100 degrees, and the subsequent steam is sprayed to 40 degrees and then reheated and dried to 80 degrees before being discharged. This design can not only convert the heat energy to the heating of soft water, but also eliminate the white smoke phenomenon of the subsequent discharged steam, because the white smoke phenomenon is caused by too much water content. The heat exchange method of the application can save more than one million boiler fuel costs for enterprises every year, and achieves the research and development purposes of energy saving and recycling, heat energy utilization and environmental protection, and effectively reduces the cost of enterprises.

Description

Technical Field

[0001] This invention belongs to the field of exhaust steam treatment technology, and in particular relates to a heat exchange, whitening, and odor removal system for exhaust steam from aerated concrete curing. Background Technology

[0002] An autoclave, also known as a steam curing autoclave or pressure autoclave, is a large, heavy pressure vessel that completes the hydrothermal reaction of CaO-SiO2-H2O inside the vessel. It has a wide range of applications and is widely used for the autoclaving of building materials such as aerated concrete blocks, concrete pipe piles, sand-lime bricks, fly ash bricks, microporous calcium silicate boards, new lightweight wall materials, thermal insulation asbestos boards, and high-strength gypsum.

[0003] To achieve higher strength, autoclaving is an essential step in aerated concrete production line. Typically, an aerated concrete production line requires 8 to 12 autoclaves, each 2.5 meters in diameter and 32 meters in length, for autoclaving concrete blocks or slabs.

[0004] The steam produced by an autoclave is called exhaust steam, which can be further divided into two types:

[0005] 1. The condensate vapor generated by the steam trap, and the large amount of condensate vapor produced by the hydration reaction during the steam curing process in the autoclave, will be accompanied by a large amount of white gas being discharged. This discharged exhaust gas has a strong odor and must be treated by spray washing before it can be discharged.

[0006] 2. The exhaust steam discharged after the autoclave curing is completed. After the autoclave has cured the products for a certain period of time, the steam is poured into the next empty autoclave. When the pressure of the two autoclaves is equal, the excess steam can only be discharged into the atmosphere, which will cause some pollution. Because of its high moisture content, it not only carries out a large amount of water but also impurities, such as various particulate matter, aerosols and various crystalline salt particles.

[0007] If exhaust steam is directly released into the air, it will form white plumes, which not only affect the visual effect but also cause pollution. However, the exhaust steam white smoke is produced at high temperature and pressure and has abundant waste heat. When there are many autoclaves, direct emission not only causes pollution but also causes enterprises to waste a lot of energy. Therefore, it is necessary to design a system that can eliminate white smoke, protect the environment, save water and energy, and enable enterprises to achieve resource utilization, waste heat recovery, and wastewater treatment. Summary of the Invention

[0008] In view of the problems existing in the prior art, the purpose of this invention is to provide a heat exchange system for deodorizing and eliminating whitening of exhaust steam from aerated concrete curing.

[0009] To solve the above problems, the present invention adopts the following technical solution:

[0010] A heat exchange system for eliminating whitening and odor from exhaust steam during the steam curing of aerated concrete is characterized by comprising an autoclave assembly, a spray tower, a transfer water storage tank, a heat exchange and condensation assembly, a high-temperature water tank, and a domestic water storage tank. The autoclave assembly is equipped with two pipelines with regulating valves: an upper exhaust steam output pipeline and a lower exhaust steam output pipeline. The lower exhaust steam output pipeline is connected to the input end of the finned heating heat exchange pipeline of the spray tower, while the upper exhaust steam output pipeline is connected to the exhaust steam input end of the heat exchanger of the heat exchange and condensation assembly. The spray tower is connected via pipelines to a cooling tower, a spray pump assembly, a heat exchange pipeline module, and the heat exchange and condensation assembly. The input and output ends of the cooling tower are connected to the output end of the isolation layer functional layer of the spray tower and the input end of the transfer water storage tank, respectively. The output and input ends of the spray pump assembly are connected to the input ends of the nozzles inside the spray tower and the output end of the transfer water storage tank, respectively. The output ends of the heat exchange pipeline module are distributed and connected to... The heat exchange pipeline module is connected to the input ends of the ball mill pulping water pipeline, the aluminum powder mixing water pipeline, and the industrial water storage tank. The input end of the heat exchange pipeline module is connected to the output end of the exhaust steam layer functional layer of the spray tower. The heat exchange and condensation working group includes one heat exchanger and two condensers. The exhaust steam output end of the heat exchanger is connected to the exhaust steam input end of the first condenser. The first condenser and the second condenser are connected end-to-end by pipelines. The exhaust steam output end of the second condenser is connected in parallel to the output end of the spray tower finned heating heat exchange pipeline and connected to the input end of the exhaust steam layer functional layer. The cold water input end of the heat exchanger is connected to the cold water output end of the high-temperature water tank through a pipeline with a circulating pump and a valve. Its soft water output end is connected to the hot water input end of the high-temperature water tank through a pipeline with a safety valve. The high-temperature water tank is connected to the boiler through a pipeline. The heat exchange tubes in the heat exchanger are H-shaped finned tubes formed by extrusion. The spray tower adopts a layered design.

[0011] Preferably, the spray tower, cooling tower, intermediate water storage tank and spray pump set are interconnected by pipelines to form a loop, wherein valves and filters are also provided between the spray pump set and the intermediate water storage tank.

[0012] Preferably, the first condenser has two soft water output terminals, both of which are connected to the soft water tank through pipelines, but one of the pipelines is equipped with a water supply pump.

[0013] Preferably, the second condenser has two water storage outlets, both of which are connected to the domestic water storage tank through pipelines, but one of the pipelines is equipped with a circulation pump.

[0014] Preferably, the high-temperature water tank is equipped with a breather valve, a water level gauge, a temperature gauge base, a pressure gauge base, an ultra-low water level sensor, a gate valve, an inlet valve, a drain valve, and an inspection door.

[0015] Preferably, the high-temperature water tank has two valves: one is located on the pipeline connected to the cold water inlet of the heat exchanger, and the other is located on the pipeline connected to the boiler. The pipeline is also equipped with a filter valve and a dual-path water pump for diverting water flow.

[0016] Preferably, the inlet valve is connected to the soft water tank via a pipeline that supplies water to the water pump.

[0017] Preferably, the output end of the cooling tower is equipped with a circulating pump.

[0018] Preferably, the inner cavity of the spray tower is provided with four functional layers: a demister functional layer, a nozzle and ceramic corrugated packing layer functional layer, an isolation layer functional layer, and a waste steam layer functional layer. Each nozzle and ceramic corrugated packing layer functional layer is equipped with a spray pump from the spray pump group to work together.

[0019] Preferably, the inner cavity of the high-temperature water tank is provided with a heat insulation plate to separate the upper hot water layer and the lower cold water layer, and the heat insulation plate is designed with a one-way partition.

[0020] Beneficial effects of the present invention

[0021] Compared with the prior art, the advantages of this invention are:

[0022] 1. The present invention operates through a process of heat exchange, condensation, spray cooling, and reheating. The heat exchange reduces the exhaust steam from a high temperature of 160 degrees Celsius to 80 degrees Celsius, converting the heat energy into heating of soft water. This heats the soft water to be supplied to the boiler from 30 degrees Celsius to 95-100 degrees Celsius. The exhaust steam is then sprayed down to 40 degrees Celsius and finally dried to 80 degrees Celsius before being discharged. This design not only converts heat energy into heating of soft water but also eliminates white smoke from the discharged exhaust steam. White smoke is caused by excessive moisture content, which can be resolved by drying. This heat exchange method can also save companies over one million yuan in boiler fuel costs annually.

[0023] 2. Compared with existing similar systems or devices, this invention adds an intermediate stage of exhaust steam cooling and condensation equipment, namely a heat exchange and condensation working group. By cooling the exhaust steam temperature, it recovers supersaturated water vapor to precipitate condensate, thereby reducing the amount of water emitted into the environment by the exhaust steam. The precipitated condensate can be recycled and transported to industrial water storage tanks and domestic water storage tanks in two ways to achieve the research and development goals of recycling, saving and protecting the environment.

[0024] 3. In this invention, the heat exchanger tubes are H-shaped finned tubes formed by extrusion. This design offers advantages such as high efficiency, compactness, and a smaller hydraulic diameter than a circular tube for the same cross-sectional area. Besides increasing the effective heat transfer area for heat exchange between the exhaust steam inside the tube and the soft water outside, it also significantly influences the spatiotemporal distribution of the flow field and temperature field on the exhaust steam side. Specifically, when the exhaust steam flows inside the heat exchanger tube, the heat in the exhaust steam is first transferred to the tube wall before reaching the fins, and finally to the soft water. Therefore, using H-shaped finned tubes increases the heat exchange area, thereby raising the temperature of the soft water and creating conditions for boiler energy conservation.

[0025] 4. The high-temperature water tank in this invention is a self-designed system. The internal cavity is divided into two layers by a heat insulation plate: an upper hot water layer and a lower cold water layer. The hot water layer is equipped with a safety valve, a breather valve, a water level gauge, an ultra-low water level sensor, a pressure gauge base, and a temperature gauge base, while the cold water layer is equipped with a temperature gauge base and a gate valve. The hot water layer ensures pressure balance and autonomous pressure relief while also monitoring water level and temperature. If the temperature is lower than the set threshold, the stainless steel one-way partition on the heat insulation plate is opened, allowing water from the hot water layer to flow into the cold water layer. After being reheated by the heat exchanger, the water flows back into the hot water layer, ensuring that the hot water layer supplied to the boiler has a sufficient temperature. This achieves the technology and effect of autonomous circulation heating, improving work efficiency.

[0026] 5. The spray tower in this invention is also independently designed. It improves the cooling effect of zero-distance spray exhaust steam through a layered design. The layered design can divide the precipitated water into two parts, which flow into a transfer storage tank and an industrial water storage tank, respectively. The condensate flowing into the transfer storage tank is cooled by the cooling tower and then stored, while the other precipitated water, which is not cooled, still has a certain temperature and may provide the remaining heat to the curing room of the workshop, thus achieving the final exchange. This reduces costs and also provides insulation for the aerated concrete. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the flow direction of the present invention;

[0029] Figure 3 This is a partial structural diagram of the present invention. Detailed Implementation

[0030] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0031] During the autoclave curing of concrete blocks or slabs, the steam condenses upon cooling, forming a large amount of condensate. This condensate must be promptly removed from the autoclave to maintain its high temperature. Furthermore, after autoclave curing is complete, to ensure safety, the steam inside the autoclave must be vented to another empty autoclave awaiting curing before opening the autoclave door. When the pressures of the two autoclaves are similar, the output of residual steam stops, leaving approximately 0.4-0.6 MPa of exhaust steam that is directly released into the atmosphere through pipes. This easily generates large amounts of white smoke, noise, and odors, polluting the environment and affecting nearby residents. The white exhaust plume forms when the exhaust steam is in a semi-saturated state and is rapidly cooled by the cooler atmosphere, causing water vapor to condense into liquid. This reduces the light transmittance of the steam exhaust, resulting in a white mist phenomenon. With the implementation of my country's ultra-clean emission policy, the formation of "white plumes" from misty water vapor can be attributed to the presence of unremoved pollutants in the exhaust steam. These pollutants mainly include: ① silicates – solid insoluble substances, such as lime, cement, and gypsum; ② soluble salts – directly emitted exhaust steam forms colored plumes, which not only affect visual appearance but also cause pollution.

[0032] Therefore, it is necessary to develop this invention to make relevant improvements, such as Figures 1 to 3As shown, the present invention discloses a heat exchange system for removing whitening and odor from exhaust steam during the steam curing of aerated concrete. The system comprises an autoclave assembly (1), a spray tower (2), a transfer water storage tank (4), a heat exchange and condensation work group (5), a high-temperature water tank (6), and a domestic water storage tank (7). The autoclave assembly (1) is equipped with two pipelines with regulating valves (100): an upper exhaust steam output pipeline (101) and a lower exhaust steam output pipeline (102). The lower exhaust steam output pipeline (102) is connected to the input end of the finned heating and heat exchange pipeline (20) of the spray tower (2), while the upper exhaust steam output pipeline (101) is connected to the exhaust steam input end of the heat exchanger (50) of the heat exchange and condensation work group (5). The two exhaust steam output pipelines allow the exhaust steam discharged from the autoclave assembly (1) to be input into the heating and heat exchange pipeline (20) and the heat exchanger (50) respectively, thereby achieving heat exchange. In order to heat the soft water in the soft water tank (11), the heat exchanger (50) in the heat exchange condensation working group (5) is connected to the high temperature water tank (6) connected to the soft water tank (11) through a pipe. The high temperature water tank (6) is equipped with a heat insulation plate (61) to separate the hot water layer and the cold water layer. Therefore, the heat exchanger (50) heats the low temperature water by connecting to the cold water layer of the high temperature water tank (6) to heat the cold water layer or the low temperature soft water input from the soft water tank (11). The cold water layer of the high temperature water tank (6) is equipped with an inlet valve, which is connected to the soft water tank (11) through a pipeline to the water pump. Therefore, the low temperature soft water in the soft water tank (11) can be introduced into the cold water layer for the heat exchanger (50) to exchange heat. In addition, the soft water output end of the heat exchanger (50) is connected to the hot water input end of the high-temperature water tank (6) through a pipeline with a safety valve, so that the heated soft water is input into the hot water layer of the high-temperature water tank (6). There is a pipeline in the hot water layer, which is equipped with a filter valve and a dual-path water pump for diverting water. In this way, the heated and stored hot water can be transported to the boiler (600) for working heating, avoiding or reducing the fuel cost required for heating the boiler (600).

[0033] The exhaust steam output from the heat exchanger (50) is also sequentially transported to the first condenser (51) and the second condenser (52), where the condensate is discharged into the soft water tank (11) and the domestic water storage tank (7) respectively, so as to realize the recycling after recovery.

[0034] In addition to the heating and heat exchange pipes (20) set at the top, the spray tower (2) also has four functional layers in its inner cavity: a demister functional layer (200), a nozzle and ceramic corrugated packing layer functional layer (201), an isolation layer functional layer (202), and a waste steam layer functional layer (203). Each nozzle and ceramic corrugated packing layer functional layer (201) is assigned a spray pump in the spray pump group (8) to work together. The spray pump pumps the cooling water input from the cooling tower (3) to the transfer storage tank (4) to the nozzle, so that the nozzle can spray the high temperature waste steam with low temperature water at zero distance. The condensate from the exhaust steam of the cooling spray is divided into two paths. One path is transported from the central isolation layer functional layer (202) to the cooling tower (3) and then into the transfer storage tank (4) for reuse by the spray pump group (8). The other path is flowed through the exhaust steam layer functional layer (203) into the heat exchange pipeline module (9) to exchange the remaining heat. Then it flows into the industrial water storage tank (10) for use in the ball mill pulping water pipeline (90) and aluminum powder stirring water pipeline (91) during processing. Alternatively, it can be directly diverted to the ball mill pulping water pipeline (90) and aluminum powder stirring water pipeline (91) for use.

[0035] It is worth mentioning that the heat exchange tubes in the heat exchanger (50) are H-shaped finned tubes formed by extrusion process. This design has the advantages of high efficiency, compactness and smaller hydraulic diameter than a circular tube under the same cross-sectional area. In addition to increasing the effective heat transfer area for heat exchange between the exhaust steam inside the heat exchange tube and the soft water outside the tube, it can also have an important impact on the spatiotemporal distribution of the flow field and temperature field on the exhaust steam side. That is, when the exhaust steam flows inside the heat exchange tube, the heat in the exhaust steam is first transferred to the tube wall of the heat exchange tube before reaching the fins, and finally transferred to the soft water. Therefore, the use of H-shaped finned tubes can increase the heat exchange area to increase the temperature of the soft water, creating conditions for boiler energy saving.

[0036] This invention enables the recovery of waste heat and the utilization of water from exhaust steam with abundant waste heat. Not only can the extracted water be used, but it can also be divided into domestic water and industrial water. While saving water and energy, it also helps to treat wastewater, enabling enterprises to achieve resource utilization and cost reduction. More importantly, it eliminates the pollution of white smoke to the environment and the impact on surrounding residents.

[0037] The general working principle of this invention is as follows: heat exchange, condensation, spray cooling, and reheating are performed on the exhaust steam. Compared with existing similar devices or systems, this invention adds an intermediate exhaust steam cooling and condensation device. By cooling the exhaust steam temperature, supersaturated water vapor is recovered to condense the condensate, reducing the amount of water emitted into the environment from the exhaust steam. Then, spray purification and deodorization are performed. At the same time, multiple nozzles in the spray tower can come into close contact with the water used in the exhaust steam, allowing the exhaust steam to exchange with low-temperature water to lower the exhaust steam temperature. Then, it is heated to dry the moisture, eliminating humidity in the exhaust steam, thereby reducing fog and eliminating white plumes.

[0038] The following advantages and data have been obtained after using this invention:

[0039] ① Significant energy-saving effect: Through heat exchange technology, the exhaust steam can be directly reduced from 160 degrees to 80 degrees, so as to increase the soft water required by the boiler from 30 degrees to 95-100 degrees. After the exhaust steam is sprayed down to 40 degrees, it will be reheated and dried to 80 degrees, so that there is no white smoke when it is finally discharged.

[0040] ② The heat exchanger has a total heat exchange area of ​​50 square meters, which can heat the 30-degree soft water to be used in the boiler to more than 98 degrees after passing through two-stage heat exchange circulation, and it can be directly used in the boiler. This design can save more than one million yuan of boiler fuel per year. For example, the heat of 15t boiler water increased by 50 degrees is 600,000 kcal, which is about the same as the heat of one ton of steam (1 ton of steam has 600,000 kcal). At 200 yuan per ton, an aerated concrete company with a production line of 300,000 cubic meters can save 1.2 million yuan per year.

[0041] ③ It can save 5-10 t / h of water. Because the present invention is designed with a condenser to recover the moisture in the exhaust steam, the condensation and cooling of the exhaust steam means that supersaturated water vapor can be precipitated into condensate. Therefore, the condensate can be collected and recycled, which can effectively save water resources.

[0042] ④ Heating is achieved using finned tubes for heating and heat exchange pipes, along with the uncooled exhaust gas discharged from the autoclave. The exhaust gas cooled by spraying flows separately from the high-temperature exhaust gas directly discharged from the autoclave. The high-temperature exhaust gas discharged from the autoclave flows through the tube side, while the exhaust gas cooled by spraying flows through the shell side. Since the main component of the white plume is water mist, the heating and whitening mechanism is to eliminate the water mist, that is, to turn the wet saturated exhaust gas into unsaturated exhaust gas, so that the exhaust gas will not form mist droplets after being cooled after being discharged into the atmosphere, thus making the white mist of the discharged exhaust gas disappear.

[0043] Through the above-mentioned design and configuration, this invention can achieve energy-saving recovery, heat energy utilization and environmental protection, and effectively reduce enterprise costs. It provides the market with another practical and efficient heat exchange, whitening and deodorization system for exhaust steam from aerated concrete curing. Of course, it can also be used in conjunction with autoclave systems in other product lines for production.

[0044] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A heat exchange system for eliminating whitening and odor from exhaust steam during the steam curing of aerated concrete, characterized in that, It includes an autoclave assembly (1), a spray tower (2), a transfer water storage tank (4), a heat exchange and condensation assembly (5), a high-temperature water tank (6), and a domestic water storage tank (7); The autoclave assembly (1) is equipped with two pipelines with regulating valves (100), namely the upper exhaust steam output pipeline (101) and the lower exhaust steam output pipeline (102). The lower exhaust steam output pipeline (102) is connected to the input end of the finned heating heat exchange pipeline (20) of the spray tower (2), while the upper exhaust steam output pipeline (101) is connected to the exhaust steam input end of the heat exchanger (50) of the heat exchange condensation working group (5). The spray tower (2) is connected to the cooling tower (3), the spray pump group (8), the heat exchange pipeline module (9) and the heat exchange condensation group (5) through pipelines respectively; The input and output ends of the cooling tower (3) are respectively connected to the output end (21) of the isolation layer functional layer (202) of the spray tower (2) and the input end of the transfer water storage tank (4); The output and input ends of the spray pump group (8) are respectively connected to the input end of the nozzle (22) inside the spray tower (2) and the output end of the transfer storage tank (4); The output end of the heat exchange pipeline module (9) is respectively branched and connected to the input end of the ball mill pulping water pipeline (90), the aluminum powder stirring water pipeline (91) and the industrial water storage tank (10), while the input end of the heat exchange pipeline module (9) is connected to the output end (23) of the exhaust steam layer functional layer (203) of the spray tower (2); The heat exchange and condensation working group (5) includes a heat exchanger (50) and two condensers. The exhaust steam output end of the heat exchanger (50) is connected to the exhaust steam input end of the first condenser (51), while the first condenser (51) and the second condenser (52) are connected end to end by a pipeline. The exhaust steam output end of the second condenser (52) is connected in parallel to the output end of the finned heating heat exchange pipeline (20) of the spray tower (2) and then connected to the input end (24) of the exhaust steam layer functional layer (203). The cold water input end of the heat exchanger (50) is connected to the cold water output end of the high-temperature water tank (6) through a pipeline with a circulating pump and a valve gate, while its soft water output end is connected to the hot water input end of the high-temperature water tank (6) through a pipeline with a safety valve. The high-temperature water tank (6) is connected to the boiler (600) via a pipeline; The heat exchange tubes in the heat exchanger (50) are H-shaped finned tubes formed by extrusion process; The spray tower (2) adopts a layered design.

2. The heat exchange, whitening, and odor removal system for exhaust steam from aerated concrete curing as described in claim 1, characterized in that, The spray tower (2), cooling tower (3), intermediate water storage tank (4) and spray pump group (8) are interconnected by pipelines to form a loop, wherein a valve (40) and a filter (41) are also provided between the spray pump group (8) and the intermediate water storage tank (4).

3. The heat exchange, whitening, and odor removal system for exhaust steam from aerated concrete curing as described in claim 1, characterized in that, The first condenser (51) has two soft water output terminals, both of which are connected to the soft water tank (11) through pipelines, but one of the pipelines is equipped with a water supply pump.

4. The heat exchange, whitening, and odor removal system for exhaust steam from aerated concrete curing as described in claim 1, characterized in that, The second condenser (52) has two water storage outlets, both of which are connected to the domestic water storage tank (7) through pipelines, but one of the pipelines is equipped with a circulation pump.

5. The heat exchange, whitening, and odor removal system for exhaust steam from aerated concrete curing as described in claim 1, characterized in that, The high-temperature water tank (6) is equipped with a breather valve, a water level gauge, a temperature gauge base, a pressure gauge base, an ultra-low water level sensor, a gate valve, an inlet valve (60), a drain valve, and an inspection door.

6. The heat exchange, whitening, and odor removal system for exhaust steam from aerated concrete curing as described in claim 5, characterized in that, There are two valves on the high-temperature water tank (6). One is located on the pipeline connected to the cold water input end of the heat exchanger (50), and the other is located on the pipeline connected to the boiler (600). The pipeline is also equipped with a filter valve and a dual-path water pump for diverting water.

7. The heat exchange, whitening, and odor removal system for exhaust steam from aerated concrete curing as described in claim 5, characterized in that, The inlet valve (60) is connected to the soft water tank (11) via a pipeline that supplies water to the water pump.

8. The heat exchange, whitening, and odor removal system for exhaust steam from aerated concrete curing as described in claim 1, characterized in that, The output end of the cooling tower (3) is equipped with a circulating pump.

9. The heat exchange, whitening, and odor removal system for exhaust steam from aerated concrete curing as described in claim 1, characterized in that, The inner cavity of the spray tower (2) is provided with four functional layers: demister functional layer (200), nozzle and ceramic corrugated packing layer functional layer (201), isolation layer functional layer (202), and exhaust steam layer functional layer (203). Each nozzle and ceramic corrugated packing layer functional layer (201) is assigned a spray pump in the spray pump group (8) to work together.

10. A heat exchange system for eliminating whitening and odor from exhaust steam during aerated concrete curing, as described in claim 1 or claim 5, characterized in that, The high-temperature water tank (6) is provided with a heat insulation plate (61) to separate the upper hot water layer and the lower cold water layer, and the heat insulation plate (61) is designed with a one-way partition.

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