A steam autoclave waste heat recovery system

Abstract

The utility model discloses a kind of steam autoclave waste heat recovery systems, including main steam admission cylinder, vacuum cylinder, exhaust cylinder and the first, second, third waste heat recovery tank in series. First waste heat recovery tank connects vacuum cylinder, recovers low-pressure tail gas;Second waste heat recovery tank connects exhaust cylinder, recovers high-pressure tail gas, its uncondensed steam can be introduced into first tank secondary use. Heat exchange coil is equipped in third waste heat recovery tank, access steam autoclave high-temperature condensate, its tank body and static chamber constitute circulation loop, utilize condensing heat to heat static chamber. Hot water generated by first, second tank can be used for boiler makeup water. The utility model realizes to steam autoclave whole-process tail gas and condensate water grading, echelon recovery, energy utilization rate is high, system structure is compact, and energy-saving benefit is remarkable.

Description

Technical Field

[0001] This utility model relates to the field of industrial waste heat recovery technology, and in particular to a waste heat recovery system for autoclaves. Background Technology

[0002] Autoclaves are core curing equipment in the production of building materials such as aerated concrete blocks, sand-lime bricks, and pipe piles, and their steam energy consumption accounts for a large proportion of the total production energy consumption. The autoclaving cycle includes multiple stages such as vacuuming, pressurization, constant pressure curing, and depressurization and steam exhaust, each of which generates a large amount of heat-rich exhaust steam and high-temperature condensate. Traditional methods often directly discharge this waste heat, resulting in significant energy waste and thermal pollution.

[0003] Existing waste heat recovery devices typically only recover waste heat from a single stage, such as recovering only the sensible heat from the high-pressure exhaust stage, while failing to adequately recover the latent heat from the low-pressure tail steam and the high-temperature condensate at the bottom of the vessel during the vacuuming stage, resulting in low overall energy utilization efficiency. Furthermore, the recovered heat has a single application and fails to achieve cascaded utilization, thus limiting economic benefits. Utility Model Content

[0004] The purpose of this invention is to provide a waste heat recovery system for autoclaves to solve the problems existing in the prior art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] An autoclave waste heat recovery system includes a main steam inlet cylinder, a vacuum steam inlet cylinder, an exhaust steam inlet cylinder, at least one autoclave, and a first waste heat recovery tank, a second waste heat recovery tank, and a third waste heat recovery tank connected in sequence.

[0007] The main steam inlet distributor cylinder is connected to the steam inlet of the autoclave via a pipe to supply fresh steam. The vacuum steam distributor cylinder is connected to the vacuum port of the autoclave via a pipe. The exhaust steam distributor cylinder is connected to the exhaust port of the autoclave via a pipe.

[0008] The inlet of the first waste heat recovery tank is connected to the vacuum steam distribution cylinder via a pipe, and is used to recover the low-pressure tail steam discharged during the vacuuming stage of the autoclave. The inlet of the second waste heat recovery tank is connected to the exhaust steam distribution cylinder via a pipe, and is used to recover the high-pressure tail steam discharged after the autoclave curing is completed.

[0009] The third waste heat recovery tank is equipped with a heat exchange coil. The inlet of the heat exchange coil is connected to the high-temperature condensate drain outlet at the bottom of the autoclave, and the outlet is connected to an external drainage system. The tank body of the third waste heat recovery tank is also connected to the inlet and outlet of a static chamber via pipes, forming a circulation loop. A high-temperature circulation pump is installed, allowing the water in the third waste heat recovery tank to exchange heat with the high-temperature condensate in the heat exchange coil and be pumped to the static chamber for heating.

[0010] Preferably, the exhaust outlet of the second waste heat recovery tank is connected to the air inlet of the first waste heat recovery tank through a pipeline, so that the exhaust gas that is not completely condensed in the second waste heat recovery tank can enter the first waste heat recovery tank for reuse, thereby realizing the cascade utilization of energy.

[0011] Preferably, the outlets of the first and / or second waste heat recovery tanks are connected to the boiler soft water tank via pipes and a water supply pump to provide preheated water to the boiler and reduce boiler fuel consumption.

[0012] Preferably, the system also includes a small steam separator, whose steam inlet is connected to the exhaust port of the first or second waste heat recovery tank, and whose steam outlet is connected to production heat-using equipment such as casting or oiling machines, so that the recovered steam can be directly used in the production process.

[0013] In summary, this utility model has the following beneficial effects:

[0014] 1. Full-process recovery: The system covers the entire autoclave cycle from vacuuming, pressurization, constant pressure to exhaust and condensation, comprehensively recovering the sensible and latent heat from high, medium, and low-pressure tail steam and high-temperature condensate, eliminating heat waste. 2. Cascaded energy utilization: Through the series connection design of multiple waste heat recovery tanks, cascaded utilization of heat from high to low grade is achieved, resulting in high system energy efficiency. For example, high-pressure tail steam first enters the second waste heat recovery tank, and its uncondensed tail steam then enters the first waste heat recovery tank. 3. Multi-purpose output: The recovered energy is used in various forms, including high-temperature hot water for boiler feedwater, process heating, and low-pressure steam for static shutdown chamber maintenance, as well as steam for other processes, perfectly matching the energy needs of different workstations on the production line. 4. Compact structure and strong practicality: The system is easy to retrofit based on existing autoclave production lines. Through the rational layout of steam distribution cylinders, pumps, valves, and pipelines, it achieves automated operation, stability, reliability, and a short investment payback period. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the principle structure of the system of this utility model;

[0016] Figure 2 This is a schematic diagram illustrating the principle structure of the first and second waste heat recovery tanks of this utility model;

[0017] Figure 3 This is a schematic diagram illustrating the connection structure between the pipeline and the autoclave in this utility model.

[0018] In the diagram, 1. Main steam inlet cylinder; 2. Vacuum steam inlet cylinder; 3. Exhaust steam inlet cylinder; 4. First waste heat recovery tank; 5. Second waste heat recovery tank; 6. Third waste heat recovery tank; 7. Static chamber; 8. Make-up water pump; 9. Small steam inlet cylinder; 10. High-temperature circulating pump; 11. Multistage pump. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0021] Example 1:

[0022] like Figures 1-3 As shown, a waste heat recovery system for an autoclave includes a main steam inlet cylinder 1, a vacuum steam inlet cylinder 2, a steam exhaust cylinder 3, at least one autoclave, and a first waste heat recovery tank 4, a second waste heat recovery tank 5, and a third waste heat recovery tank 6 connected in sequence.

[0023] The main steam inlet separator 1 is connected to the steam inlet of the autoclave via a pipe to supply fresh steam; the vacuum separator 2 is connected to the vacuum port of the autoclave via a pipe; and the exhaust separator 3 is connected to the exhaust port of the autoclave via a pipe.

[0024] The inlet of the first waste heat recovery tank 4 is connected to the vacuum steam distribution cylinder 2 through a pipe, and is used to recover the low-pressure tail steam discharged during the vacuuming stage of the autoclave; the inlet of the second waste heat recovery tank 5 is connected to the exhaust steam distribution cylinder 3 through a pipe, and is used to recover the high-pressure tail steam discharged after the autoclave curing is completed.

[0025] The third waste heat recovery tank 6 is equipped with a heat exchange coil. The inlet of the heat exchange coil is connected to the high-temperature condensate drain outlet at the bottom of the autoclave, and the outlet is connected to the external drainage system. The tank body of the third waste heat recovery tank 6 is also connected to the inlet and outlet of a static chamber 7 through pipes, forming a circulation loop. This allows the water in the third waste heat recovery tank 6 to exchange heat with the high-temperature condensate in the heat exchange coil and be pumped to the static chamber 7 for heating. The exhaust steam outlet of the second waste heat recovery tank 5 is connected to the inlet of the first waste heat recovery tank 4 through a pipe, allowing the incompletely condensed exhaust steam in the second waste heat recovery tank 5 to enter the inlet of the first waste heat recovery tank 4. The system allows for reuse of hot water. The outlets of the first waste heat recovery tank 4 and / or the second waste heat recovery tank 5 are connected to the boiler's soft water tank via pipes and a makeup water pump 8 to provide preheating makeup water for the boiler. The system also includes a small steam distribution cylinder 9, whose inlet is connected to the outlet of the first waste heat recovery tank 4 or the second waste heat recovery tank 5, and whose outlet is connected to production heat-generating equipment such as casting or oiling machines. A high-temperature circulating pump 10 is installed in the circulation loop between the third waste heat recovery tank 6 and the static chamber 7. Multi-stage pumps 11 are connected to the outlets of both the first and second waste heat recovery tanks 4 and 5 to pressurize and transport the hot water to designated water points. Check valves, manual valves, and pressure gauges are installed on the pipes connecting each steam distribution cylinder, waste heat recovery tank, and pump.

[0026] Specific implementation process: Low-pressure tail steam recovery: The low-pressure, low-temperature tail steam discharged from the autoclave during the vacuuming stage is introduced into the first waste heat recovery tank 4 through the vacuum steam separator 2. The tail steam directly contacts and exchanges heat with cold water in the tank, heating the water. The heated water can be sent to the boiler soft water tank as preheating makeup water through the multi-stage pump 11.

[0027] High-pressure exhaust steam recovery: During the exhaust phase after the autoclave's curing process, the high-pressure, high-temperature exhaust steam generated enters the second waste heat recovery tank 5 through the exhaust steam distributor 3. The exhaust steam releases a large amount of latent heat of vaporization within the tank, heating the water inside to near-saturation temperature. This hot water can also be used for boiler feedwater or other high-temperature heat applications. Residual exhaust steam that is not completely condensed at the top of the second waste heat recovery tank 5 can be introduced into the first waste heat recovery tank 4 for secondary recovery.

[0028] Condensate Waste Heat Recovery: The continuously generated high-temperature condensate at the bottom of the autoclave is close to the temperature of the steam inside the autoclave and is introduced into the heat exchange coil inside the third waste heat recovery tank 6. The third waste heat recovery tank 6 itself acts as a water storage tank, and the water inside the tank circulates between the static chambers 7 via a high-temperature circulating pump 10. When the circulating water flows through the third waste heat recovery tank 6, it undergoes indirect heat exchange with the high-temperature condensate in the coil. After being heated, it is sent to the static chamber 7 to provide pre-curing heat for the billet, while the condensate is cooled and discharged. This effectively recovers the valuable sensible heat of the high-temperature condensate.

[0029] Direct Steam Utilization: Low-pressure steam drawn from the first or second waste heat recovery tank can be distributed through the small steam distribution cylinder 9 and directly supplied to production equipment that does not require high steam pressure, such as casting processes and oiling machines.

[0030] Through the aforementioned structure, this system effectively utilizes all waste heat generated during the operation of the autoclave, significantly reducing steam consumption and achieving remarkable energy savings.

[0031] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0032] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A waste heat recovery system for an autoclave, characterized in that, include: The main steam inlet cylinder (1), the vacuum steam inlet cylinder (2), the exhaust steam inlet cylinder (3), at least one autoclave, and the first waste heat recovery tank (4), the second waste heat recovery tank (5) and the third waste heat recovery tank (6) connected in sequence. The main steam inlet separator (1) is connected to the steam inlet of the autoclave via a pipe and is used to supply fresh steam; the vacuum separator (2) is connected to the vacuum port of the autoclave via a pipe; the exhaust separator (3) is connected to the exhaust port of the autoclave via a pipe. The inlet of the first waste heat recovery tank (4) is connected to the vacuum steam distribution cylinder (2) through a pipe, and is used to recover the low-pressure tail steam discharged during the vacuuming stage of the autoclave; the inlet of the second waste heat recovery tank (5) is connected to the exhaust steam distribution cylinder (3) through a pipe, and is used to recover the high-pressure tail steam discharged after the autoclave is cured. The third waste heat recovery tank (6) is equipped with a heat exchange coil. The inlet of the heat exchange coil is connected to the high-temperature condensate discharge port at the bottom of the autoclave, and the outlet is connected to the external drainage system. The tank body of the third waste heat recovery tank (6) is also connected to the inlet and outlet of a static chamber (7) through a pipe to form a circulation loop, so that the water in the third waste heat recovery tank (6) can exchange heat with the high-temperature condensate in the heat exchange coil and be pumped to the static chamber (7) for heating.

2. The autoclave waste heat recovery system according to claim 1, characterized in that: The exhaust outlet of the second waste heat recovery tank (5) is connected to the air inlet of the first waste heat recovery tank (4) through a pipeline, so that the exhaust gas that is not completely condensed in the second waste heat recovery tank (5) can enter the first waste heat recovery tank (4) for reuse.

3. The autoclave waste heat recovery system according to claim 1, characterized in that: The outlets of the first waste heat recovery tank (4) and / or the second waste heat recovery tank (5) are connected to the boiler soft water tank via pipes and a water supply pump (8) to provide preheating water for the boiler.

4. The autoclave waste heat recovery system according to claim 1, characterized in that: The system also includes a small steam cylinder (9), the steam inlet of which is connected to the exhaust port of the first waste heat recovery tank (4) or the second waste heat recovery tank (5), and its steam outlet is connected to the casting / oiling machine.

5. The autoclave waste heat recovery system according to claim 1, characterized in that: A high-temperature circulating pump (10) is installed in the circulation loop between the third waste heat recovery tank (6) and the static chamber (7).

6. The autoclave waste heat recovery system according to claim 1, characterized in that: The outlets of the first waste heat recovery tank (4) and the second waste heat recovery tank (5) are both connected to multi-stage pumps (11) for pressurizing and transporting the hot water in the tank to the designated water point.

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