Still kettle waste heat recovery system

Abstract

The utility model discloses a waste heat recovery system of a still kettle, and belongs to the technical field of heat energy recycling. According to the system, high-pressure steam is stored in a high-pressure steam storage tank, low-pressure steam is stored in a low-pressure steam storage tank, high-temperature condensed water is stored in a high-temperature water storage tank, and low-temperature condensed water and normal-pressure condensed water are stored in a low-temperature water storage tank through a residual steam recycling, grading and storing steam-distributing cylinder and a condensed water discharging cylinder; meanwhile, steam with lower pressure is used for heating condensed water in the high-temperature water storage tank and the low-temperature water storage tank, so that residual steam with different qualities is stored according to different storage functions in the whole steam exhaust and residual steam recycling and grading storage process of the still kettle, high-energy high storage and low-energy low storage of the residual steam are fully embodied, high energy and high use are further realized, and energy conservation and environmental protection are realized. And the low-energy and low-consumption energy gradient utilization effect is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat energy recovery and utilization, and particularly relates to a system for recovering and reusing the waste heat of an autoclave in the production process of aerated concrete. Background Art

[0002] Aerated concrete (such as aerated bricks, plates, etc.) is a lightweight porous silicate product made from siliceous materials and calcareous materials as the main raw materials, adding a foaming agent, and passing through processes such as batching, mixing, casting, pre-curing, cutting, autoclaving, and curing. It has the advantages of light bulk density, high heat insulation performance, good sound absorption effect, etc.

[0003] Figure 1 As a typical process flow of aerated concrete, among them, the autoclave curing process is a key part in the production and processing of aerated concrete. The pressurized steam after autoclave curing contains a lot of heat. If directly discharged, it will cause great waste of energy. Therefore, many waste heat recovery and reuse technologies for autoclaves have emerged. For example, in the energy-saving and consumption-reducing method disclosed in Chinese patent document CN116551824A, a number of autoclaves are arranged in sequence. The pressure relief port of the previous autoclave is connected to the inner cavity of the adjacent subsequent autoclave through a pressure relief pipeline. After the previous autoclave finishes steam curing, 0.3 Mpa of steam is released into the adjacent subsequent autoclave to preheat the plate blank in the adjacent subsequent autoclave. At the same time, the waste heat of the wastewater and waste steam discharged after each autoclave finishes steam curing is used to provide heat exchange heat energy for boilers, heating devices in the workshop curing room, and domestic hot water devices, realizing the recovery and reuse of energy, and further achieving the effect of energy conservation and consumption reduction. In addition, in the steam curing waste gas recovery device disclosed in Chinese patent document CN214925552U, the steam used in the autoclave is recovered into an energy storage tank for subsequent secondary utilization of the steam. Through the inlet pipe, the steam in the energy storage tank can be introduced into the autoclave that needs low-pressure steam curing to make full use of the remaining energy of the steam, and the steam can also be introduced into other working environments that only need low-pressure steam (pre-curing room, static stop room, mesh drying room, and casting building) to make full use of the energy of the steam.

[0004] However, the existing solutions do not consider the hierarchical and cascaded reuse of different grades of energy when recovering and reusing waste heat, which belongs to a rough waste heat recovery technology. For example, in the steam curing waste gas recovery device disclosed in CN214925552U, when recovering steam, the high-pressure and low-pressure steam discharged from the autoclave successively is not distinguished, but is mixed and filled in the same energy storage tank and then discharged and utilized outward. There is a large heat energy loss in this process, and the waste heat recovery utilization rate is low. At the same time, the steam that cannot be utilized is finally discharged into the hot water pool, resulting in some steam energy not being utilized. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a heat recovery system for autoclaves, which realizes the cascade utilization of energy by making high-energy use of high-energy and low-energy use of low-energy, thereby improving the heat recovery efficiency of autoclaves.

[0006] To achieve the above purpose, the technical solution of the present utility model is as follows:

[0007] In the first aspect of the present utility model, a heat recovery system for autoclaves is disclosed. The system includes:

[0008] A high-pressure steam storage tank for waste steam recovery, whose input interface is connected to the outlet of the fourth waste steam inlet pipe, and is used to introduce high-pressure waste steam into the high-pressure steam storage tank for waste steam recovery through the fourth waste steam inlet pipe during the initial steam discharge stage of the autoclave. The output interface is connected to the inlet of the first waste steam outlet pipe;

[0009] A low-pressure steam storage tank for waste steam recovery, whose input interface is connected to the outlet of the third waste steam inlet pipe, and is used to introduce waste steam into the low-pressure steam storage tank for waste steam recovery through the third waste steam inlet pipe when the steam discharge pressure of the autoclave is lower than the first pressure value or the waste steam pressure is not enough to continue to be pressed into the high-pressure steam storage tank for waste steam recovery. The output interface is connected to the inlet of the second waste steam outlet pipe;

[0010] A high-temperature water storage tank for condensate recovery, whose first input interface is connected to the outlet of the first waste steam inlet pipe, and is used to introduce waste steam into the high-temperature water storage tank for condensate recovery through the first waste steam inlet pipe when the steam discharge pressure of the autoclave is lower than the second pressure value or the waste steam pressure is not enough to continue to be pressed into the high-pressure steam storage tank for waste steam recovery and the low-pressure steam storage tank for waste steam recovery. The second input interface is connected to the high-pressure condensate main pipe of the autoclave. The first output interface is connected to the inlet of the third waste steam outlet pipe, and the second output interface is connected to the high-temperature hot water outlet pipe;

[0011] A low-temperature water storage tank for condensate recovery, whose first input interface is connected to the outlet of the second waste steam inlet pipe, and is used to introduce waste steam into the low-temperature water storage tank for condensate recovery through the second waste steam inlet pipe when the steam discharge pressure of the autoclave is lower than the third pressure value or the waste steam pressure is not enough to continue to be pressed into the high-pressure steam storage tank for waste steam recovery, the low-pressure steam storage tank for waste steam recovery and the high-temperature water storage tank for condensate recovery. The second input interface is connected to the low-pressure condensate main pipe of the autoclave, the third input interface is connected to the atmospheric pressure condensate main pipe of the autoclave, and the output interface is connected to the low-temperature hot water outlet pipe.

[0012] In other embodiments, the system further includes:

[0013] A stepped storage steam separator for waste steam recovery, including a waste steam inlet and four waste steam outlets. The waste steam inlet is connected to the waste steam recovery main pipe of the autoclave. The first waste steam outlet is connected to the inlet of the first waste steam inlet pipe, the second waste steam outlet is connected to the inlet of the second waste steam inlet pipe, the third waste steam outlet is connected to the inlet of the third waste steam inlet pipe, and the fourth waste steam outlet is connected to the inlet of the fourth waste steam inlet pipe.

[0014] In other embodiments, the system further includes:

[0015] A condensate drain cylinder, including a condensate inlet and three condensate outlets. The condensate inlet is connected to the condensate discharge outlet of the autoclave, and the three condensate outlets are respectively connected to a high-pressure condensate main pipe, a low-pressure condensate main pipe, and an atmospheric-pressure condensate main pipe.

[0016] In other embodiments, the system further includes:

[0017] An autoclave residual steam recovery collecting cylinder, whose inlet is respectively connected to the exhaust pipes of each autoclave through an autoclave residual steam exhaust pipe, and the outlet is connected to an autoclave residual steam recovery main pipe.

[0018] In other embodiments, the system further includes:

[0019] A residual steam recovery and reuse manifold, including three residual steam recovery inlets and one residual steam reuse outlet. The three residual steam recovery inlets are respectively connected to a first residual steam outlet pipe, a second residual steam outlet pipe, and a third residual steam outlet pipe, and the residual steam reuse outlet is connected to a residual steam reuse main pipe.

[0020] In other embodiments, the high-temperature hot water output pipe provides heat energy to a first heat-using system through a first heat exchanger, and the low-temperature hot water output pipe provides heat energy to a second heat-using system through a second heat exchanger.

[0021] In other embodiments, the first heat-using system includes a drying system in a rest area and a marshalling area.

[0022] In other embodiments, the residual steam recovery low-pressure steam storage tank and / or the residual steam recovery high-pressure steam storage tank further include a condensate output interface, which is connected to the high-temperature hot water output pipe through a high-temperature hot water pipe, and a switch control valve is provided on the condensate output interface or the high-temperature hot water pipe. In other embodiments, each autoclave is correspondingly provided with a condensate drain cylinder, the condensate inlet of the condensate drain cylinder is connected to the condensate discharge outlet arranged at the bottom of the corresponding autoclave, and the three condensate outlets of each condensate drain cylinder are respectively converged to the high-pressure condensate main pipe, the low-pressure condensate main pipe, and the atmospheric-pressure condensate main pipe through a high-pressure condensate pipe, a low-pressure condensate pipe, and an atmospheric-pressure condensate pipe.

[0023] By adopting the present utility model, in the whole process of autoclave exhaust and residual steam recovery and hierarchical storage, the residual steam of different qualities is stored according to different storage functions, fully reflecting the high-energy high-storage and low-energy low-storage of the residual steam, and thus realizing the energy cascade utilization effect of high-energy high-usage and low-energy low-usage. Description of the Drawings

[0024] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, purposes, and advantages of the present utility model will become more obvious:

[0025] Figure 1 It is a schematic diagram of the typical technological process of aerated concrete;

[0026] Figure 2 It is a schematic diagram of the pipeline on the autoclave side of the waste heat recovery system according to an embodiment of the present invention. In the figure, 100 - autoclave; 1 - autoclave steam distribution cylinder; 2 - autoclave steam inlet pipe; 3 - autoclave residual steam exhaust pipe; 4 - autoclave residual steam recovery collecting cylinder; 5 - autoclave residual steam recovery main pipe; 16 - condensate drainage cylinder; 17 - high-pressure condensate main pipe; 18 - low-pressure condensate main pipe; 19 - atmospheric (open-type) condensate main pipe;

[0027] Figure 3 It is a schematic diagram of the pipeline on the storage tank system side of the waste heat recovery system according to an embodiment of the present invention. In the figure, 200 - condensate recovery high-temperature water storage tank; 300 - condensate recovery low-temperature water storage tank; 400 - residual steam recovery low-pressure steam storage tank; 500 - residual steam recovery high-pressure steam storage tank; 6 - residual steam recovery grading storage steam distribution cylinder; 7 - first residual steam introduction pipe; 8 - second residual steam introduction pipe; 9 - third residual steam introduction pipe; 10 - fourth residual steam introduction pipe; 11 - first residual steam export pipe; 12 - second residual steam export pipe; 13 - third residual steam export pipe; 14 - residual steam recovery and reuse steam distribution cylinder; 15 - residual steam reuse main pipe; 20 - high-temperature hot water output pipe; 21 - low-temperature hot water output pipe;

[0028] Figure 4 It is a schematic diagram of the heat exchange and heat supply system pipeline according to an embodiment of the present invention. In the figure, 22 - workshop drainage collection pool; 23 - heat exchanger; 24, 25 - heat-using systems; Detailed implementation manners

[0029] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than limiting the invention. In addition, it should be noted that for the convenience of description, only the parts related to the relevant invention are shown in the drawings.

[0030] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and embodiments.

[0031] Figure 2 It is a schematic diagram of the pipeline on the autoclave side of the waste heat recovery system according to an embodiment of the present invention. As Figure 2As shown in the figure, the steam inlet of the autoclave manifold 1 is connected to the boiler supply pipe, and the steam outlet is connected to the steam inlet pipes of each autoclave 100 through the autoclave steam inlet pipe 2, which is used to supply steam to the autoclave during the autoclaving stage. The inlets of the autoclave waste steam exhaust pipes 3 are respectively connected to the exhaust pipes of each autoclave 100, and the outlets are connected to the inlet of an autoclave waste steam recovery manifold 4. The outlet of the autoclave waste steam recovery manifold 4 is connected to the autoclave waste steam recovery main pipe 5.

[0032] Each autoclave 100 is correspondingly provided with a condensate drainage cylinder 16. The condensate inlet of the condensate drainage cylinder 16 is connected to the condensate discharge outlet arranged at the bottom of the corresponding autoclave 100. The condensate drainage cylinder 16 includes three condensate outlets, which are respectively connected to a high-pressure condensate pipe, a low-pressure condensate pipe, and an atmospheric (open-type) condensate pipe. The high-pressure condensate pipes of each autoclave 100 converge to the high-pressure condensate main pipe 17, the low-pressure condensate pipes converge to the low-pressure condensate main pipe 18, and the atmospheric (open-type) condensate pipes converge to the atmospheric condensate main pipe 19.

[0033] Figure 3 It is a schematic diagram of the pipeline on the storage tank system side of the waste heat recovery system according to an embodiment of the present invention. As Figure 3 shown, the storage tank system includes a waste steam recovery graded storage manifold 6, a condensate recovery high-temperature water storage tank 200, a condensate recovery low-temperature water storage tank 300, a waste steam recovery low-pressure steam storage tank 400, a waste steam recovery high-pressure steam storage tank 500, and a waste steam recovery and reuse manifold 14.

[0034] The waste steam inlet of the waste steam recovery graded storage manifold 6 is connected to the autoclave waste steam recovery main pipe 5. The waste steam recovery graded storage manifold 6 includes four waste steam outlets. The first waste steam outlet is connected to the inlet of the first waste steam introduction pipe 7, the second waste steam outlet is connected to the inlet of the second waste steam introduction pipe 8, the third waste steam outlet is connected to the inlet of the third waste steam introduction pipe 9, and the fourth waste steam outlet is connected to the inlet of the fourth waste steam introduction pipe 10.

[0035] The condensate recovery high-temperature water storage tank 200 includes two input interfaces and two output interfaces. The first input interface is connected to the outlet of the first waste steam introduction pipe 7, the second input interface is connected to the high-pressure condensate main pipe 17, the first output interface is connected to the inlet of the third waste steam export pipe 13, and the second output interface is connected to the high-temperature hot water output pipe 20.

[0036] The condensate recovery low-temperature water storage tank 300 includes three input interfaces and one output interface. The first input interface is connected to the outlet of the second waste steam introduction pipe 8, the second input interface is connected to the low-pressure condensate main pipe 18, the third input interface is connected to the atmospheric (open-type) condensate main pipe 19, and the output interface is connected to the low-temperature hot water output pipe 21.

[0037] The low-pressure steam storage tank 400 for surplus steam recovery includes an input interface and an output interface. The input interface is connected to the outlet of the third surplus steam inlet pipe 9, and the output interface is connected to the inlet of the second surplus steam outlet pipe 12.

[0038] The high-pressure steam storage tank 500 for surplus steam recovery includes an input interface and an output interface. The input interface is connected to the outlet of the fourth surplus steam inlet pipe 10, and the output interface is connected to the inlet of the first surplus steam outlet pipe 11.

[0039] The steam distribution cylinder 14 for surplus steam recovery and reuse includes three surplus steam recovery inlets and one surplus steam reuse outlet. The three surplus steam recovery inlets are respectively connected to the first surplus steam outlet pipe 11, the second surplus steam outlet pipe 12, and the third surplus steam outlet pipe 13. The surplus steam reuse outlet is connected to the main surplus steam reuse pipe 15.

[0040] It should be noted that in the present utility model, control valves, such as manual control valves or automatic control valves, are provided at the steam inlets and outlets or condensate inlets and outlets of the autoclave steam distribution cylinder 1, each autoclave 100, the autoclave surplus steam collection cylinder 4, the condensate drainage cylinder 16, the high-temperature water storage tank 200 for condensate recovery, the low-temperature water storage tank 300 for condensate recovery, the low-pressure steam storage tank 400 for surplus steam recovery, the high-pressure steam storage tank 500 for surplus steam recovery, the stepped storage steam distribution cylinder 6 for surplus steam recovery, and the steam distribution cylinder 14 for surplus steam recovery and reuse, for realizing pipeline switch control and / or flow regulation.

[0041] Figure 4 It is a schematic diagram of the pipeline of the heat exchange and heat supply system according to an embodiment of the present utility model. As Figure 4 shown, the high-temperature hot water output pipe 20 provides heat energy to the first heat-using system 24 through the heat exchanger 23. The first heat-using system 24 includes, for example, the drying systems in the rest area and the marshalling area. The low-temperature hot water output pipe 21 provides heat energy to the second heat-using system 25 through the heat exchanger 23. The second heat-using system 25 includes, for example, the indoor heating systems of factory buildings (such as office buildings, apartments, canteens, etc.), as well as the boiler feed water preheating system and the domestic hot water system, etc.

[0042] The low-pressure steam storage tank 400 for surplus steam recovery and / or the high-pressure steam storage tank 500 for surplus steam recovery further includes a condensate output interface, which is connected to the high-temperature hot water output pipe 20 through a high-temperature hot water pipe. A switch control valve is provided at the condensate output interface or the high-temperature hot water pipe. By controlling the switch control valve, the high-temperature hot water generated in the low-pressure steam storage tank 400 for surplus steam recovery and / or the high-pressure steam storage tank 500 for surplus steam recovery is output through the high-temperature hot water output pipe 20 as standby hot water to assist the high-temperature water storage tank 200 for condensate recovery in providing heat energy to the first heat-using system 24.

[0043] The working process of the autoclave waste heat recovery and utilization system is described below.

[0044] In the autoclaving stage, the aerated bricks or plates are put into the autoclave for autoclaving. After high-pressure steam is sent in, the pressure in the autoclave rises slowly, and this process lasts for about 3 hours. When the pressure rises to 1.25 MPa, it enters the pressure stabilization process, which lasts for about 8 hours and then the autoclaving stage is completed. After that, it enters the pressure reduction stage, that is, the steam exhaust stage, which lasts for about 3 hours.

[0045] A large amount of condensed water is produced during the autoclaving process. For example, in a certain process flow, about 15 tons of condensed water is produced in a complete autoclaving process of the autoclave, and the highest discharge temperature of the condensed water is 190 °C. At present, the condensed water recovery is all an open recovery system, that is, a condensate pool with a small volume is made in front of the autoclave. Discharging so much high-temperature condensed water into the condensate pool with a small volume in front of the autoclave will inevitably cause the water temperature in the condensate pool to rise (greater than 100 °C), forming secondary vaporization, seriously affecting the environment and also causing a large amount of heat loss. At the same time, in order to avoid secondary vaporization in the condensate pool, cold water usually needs to be continuously added, resulting in a low recovery temperature of the condensed water in the open recovery system. Therefore, the methods of using condensed water in the autoclave industry at present are mostly for heating with condensed water in winter and preheating boiler feed water, etc. Generally speaking, the energy utilization rate of the condensed water in the autoclave is relatively low and belongs to the category of low-efficiency utilization.

[0046] In view of the drawbacks of the open condensed water recovery, the present utility model adopts a closed condensed water recovery scheme. Three drainage pipes are arranged on the condensate drain cylinder 16 under the autoclave, one high-pressure condensed water discharge pipe, one low-pressure condensed water discharge pipe, and one open condensed water discharge pipe. The high-pressure condensed water pipes led out from the condensate drain cylinder 16 converge to the high-pressure condensed water main pipe 17, the low-pressure condensed water pipes converge to the low-pressure condensed water main pipe 18, and the normal-pressure (open) condensed water pipes converge to the normal-pressure condensed water main pipe 19. The high-pressure condensed water main pipe 17 sends the high-temperature and high-pressure condensed water under the autoclave into the high-temperature water storage tank 200 for condensed water recovery. The low-pressure condensed water main pipe 18 and the normal-pressure condensed water main pipe 19 send the low-temperature and low-pressure condensed water under the autoclave into the low-temperature water storage tank 300 for condensed water recovery (the low-temperature water storage tank is non-pressurized). In addition to collecting condensed water, the high-temperature water storage tank 200 for condensed water recovery and the low-temperature water storage tank 300 for condensed water recovery also receive low-pressure steam through the first surplus steam introduction pipe 7 and the second surplus steam introduction pipe 8 respectively. That is, when some of the low-pressure surplus steam discharged from the autoclave cannot be discharged into the low-pressure steam storage tank 400 for surplus steam recovery and the high-pressure steam storage tank 500 for surplus steam recovery through the third surplus steam introduction pipe 9 and the fourth surplus steam introduction pipe 10, it can continue to be discharged into the high-temperature water storage tank 200 for condensed water recovery and the low-temperature water storage tank 300 for condensed water recovery to achieve the maximum recovery of surplus steam.

[0047] In the autoclave industry, steam heating mode is generally adopted for heating in the curing area and marshalling area, that is, steam heating is carried out through steam bare tube steel radiators. In the present utility model, the high-temperature condensate stored in the condensate recovery high-temperature water storage tank 200 is sent into the heat exchanger 23 through the high-temperature hot water output pipe 20, which is used to heat the curing area and marshalling area (the environmental temperature requirements of the curing area and marshalling area are 60°C), and closed condensate recovery is adopted, realizing the condensate waste heat heating mode in the curing area and marshalling area, and greatly reducing the energy consumption of the aerated block and board production process. At the same time, according to the characteristics of autoclave condensate discharge, the present utility model sends the condensate stored in the condensate recovery low-temperature water storage tank 300 into another heat exchanger 23 through the low-temperature hot water output pipe 21, which is used to heat other low-temperature heat-using systems, such as office area heating and boiler feed water preheating. Thus, in the process of condensate discharge and condensate storage, the present utility model fully meets the energy cascade utilization effect of high energy for high use and low energy for low use, and greatly improves the thermal energy utilization rate.

[0048] During the autoclaving process, after the boiler steam supply pipeline enters the autoclave steam distribution cylinder 1 in the autoclave production area from the boiler room, N steam supply pipelines (it can be understood that the quantity N here is not limited to the 3 shown in the figure) are respectively led out to supply steam to each autoclave. When an autoclave finishes loading aerated bricks or concrete boards, the electric control valve (or grid gate) of the steam supply pipeline of the autoclave is opened to supply steam to the autoclave.

[0049] One autoclaving cycle of the autoclave is roughly divided into three stages: (1) Autoclave pressure rising stage: The autoclave starts to rise in pressure. The pressure rising process takes about 2.5 hours. When the autoclave pressure reaches 1.25 MPa, the autoclave pressure rising is completed and enters the pressure stabilizing stage; (2) Pressure stabilizing stage: In the pressure stabilizing stage, the autoclave pressure is maintained at 1.25 MPa, and the pressure stabilizing time is about 8 hours. When the time reaches 8 hours, the pressure stabilizing process ends, and the autoclave operation enters the pressure reducing and steam exhausting stage; (3) Pressure reducing and steam exhausting stage: In the pressure reducing and steam exhausting stage, the autoclave pressure drops from 1.25 MPa to 0 MPa, and the pressure reducing and steam exhausting process takes about 3 hours.

[0050] Taking the autoclave volume of 200 m 3 as an example, about 78 m 3 of aerated blocks or boards are cooked or heated in the autoclave. Cooking or heating one autoclave of aerated bricks or concrete boards requires 10 tons of steam. Except for the heat dissipation of the autoclave body and pipelines (the heat dissipation of the autoclave body and pipelines is very small), most of the steam is stored in the aerated block or board materials in the autoclave. Therefore, a large amount of surplus steam will be released during the pressure reducing and steam exhausting stage of the autoclave. Recycling this part of the surplus steam is an important means to improve the process energy efficiency of the autoclave.

[0051] The traditional practice of reusing surplus steam is to pour steam from one autoclave to another. That is, during the pressure reduction and steam exhaust stage of the autoclave that has completed steaming, steam is poured into another autoclave that is newly filled with aerated blocks or plates. However, even when time and space permit, as the pressure of the steam exhaust autoclave decreases and the pressure of the steam filling autoclave increases, the traditional steam pouring process can no longer pour steam into the steam filling autoclave after the pressure of the steam exhaust autoclave drops from 1.25 MPa to 0.5 MPa. The remaining 0.5 Mpa steam in the steam exhaust autoclave can only be discharged into the air or discharged by spraying water for cooling.

[0052] When entering the pressure reduction and steam exhaust stage after the pressure stabilization ends, the steam discharged from the autoclave enters the autoclave surplus steam recovery collecting cylinder 4 (or exhaust cylinder) through the autoclave surplus steam exhaust pipe 3. In the present invention, the outlet of the autoclave surplus steam recovery collecting cylinder 4 is connected to the autoclave surplus steam recovery main pipe 5, and the autoclave surplus steam is introduced into the surplus steam recovery grading storage distributing cylinder 6. The surplus steam here can be the remaining steam after the steam pouring ends (the steam that cannot be filled into the steam filling autoclave), or the steam in the autoclave during the steam pouring process, or the steam discharged from the autoclave at any time during the pressure reduction and steam exhaust stage. That is, regardless of whether the autoclave pours steam or not, or regardless of the pressure of the surplus steam, as long as the production process does not require the surplus steam, it can be introduced into the surplus steam recovery grading storage distributing cylinder 6 through the autoclave surplus steam recovery main pipe 5.

[0053] The four surplus steam outlets of the surplus steam recovery grading storage distributing cylinder 6 are respectively and correspondingly connected to the inlets of the condensate recovery high-temperature water storage tank 200, the condensate recovery low-temperature water storage tank 300, the surplus steam recovery low-pressure steam storage tank 400, and the surplus steam recovery high-pressure steam storage tank 500 through the first surplus steam inlet pipe 7, the second surplus steam inlet pipe 8, the third surplus steam inlet pipe 9, and the fourth surplus steam inlet pipe 10.

[0054] During the initial steam exhaust stage of the autoclave, the surplus steam pressure is high, and the high-pressure surplus steam is introduced into the surplus steam recovery high-pressure steam storage tank 500 (high-pressure steam tank) through the fourth surplus steam inlet pipe 10. This stage is for high-pressure discharge and high-pressure storage of the surplus steam, creating conditions for the high-energy and high-utilization of the surplus steam in the later stage.

[0055] When the steam exhaust pressure of the autoclave is slightly lower, for example, when the pressure is lower than the first pressure value or the surplus steam pressure is not sufficient to continue to be pressed into the surplus steam recovery high-pressure steam storage tank 500, the surplus steam is introduced into the surplus steam recovery low-pressure steam storage tank 400 (low-pressure steam tank) through the third surplus steam inlet pipe 9. This stage is for low-pressure discharge and low-pressure storage of the surplus steam.

[0056] When the exhaust steam pressure of the autoclave further decreases, for example, when the pressure is lower than the second pressure value or the residual steam pressure is insufficient to continue pressing into the high-pressure steam storage tank 500 for residual steam recovery and the low-pressure steam storage tank 400 for residual steam recovery, the residual steam is introduced into the condensate recovery high-temperature water storage tank 200 (high-temperature water tank) through the first residual steam inlet pipe 7, and the condensate in the tank is heated. This stage is the low-pressure discharge of residual steam, heating the high-temperature hot water storage tank. In the present utility model, the condensate recovery high-temperature water storage tank 200 usually has high-temperature condensate in the lower part in the liquid phase and steam in the upper part. At the same time, when the pressure in the tank decreases, part of the high-temperature condensate will be converted into steam, that is, this energy storage tank is a steam energy storage tank with vapor-liquid phase change.

[0057] When the exhaust steam pressure of the autoclave further decreases, for example, when the pressure is lower than the third pressure value or the residual steam pressure is insufficient to continue pressing into the high-pressure steam storage tank 500 for residual steam recovery, the low-pressure steam storage tank 400 for residual steam recovery and the condensate recovery high-temperature water storage tank 200, the residual steam is introduced into the condensate recovery low-temperature water storage tank 300 (low-temperature hot water tank) through the second residual steam inlet pipe 8, for heating the condensate in the tank. This stage is the low-pressure discharge of residual steam, heating the low-temperature hot water storage tank.

[0058] It can be understood that in the above text, the first pressure value > the second pressure value > the third pressure value.

[0059] It can be understood that in the above process, a pressure sensor and an electric control valve can be used to realize the introduction of residual steam with corresponding pressure values into the corresponding storage tanks through corresponding residual steam inlet pipes at different stages by program control. The specific control process belongs to the conventional technology in this field, and the present utility model will not elaborate here.

[0060] The exhaust process of the autoclave production process is the initial high-pressure residual steam discharge, and finally the pressure of the autoclave drops to the atmospheric pressure due to continuous external steam discharge. In the whole exhaust process of the autoclave and the hierarchical storage process of residual steam recovery, residual steam of different qualities is stored according to different storage functions, fully reflecting the high-energy and high-storage of residual steam and low-energy and low-storage, and thus realizing the energy cascade utilization effect of high-energy and high-utilization and low-energy and low-utilization.

[0061] The high-pressure steam storage tank 500 for residual steam recovery, the low-pressure steam storage tank 400 for residual steam recovery, and the condensate recovery high-temperature water storage tank 200 are respectively connected to three residual steam recovery inlets of the residual steam recovery and reuse manifold 14 through the first residual steam outlet pipe 11, the second residual steam outlet pipe 12, and the third residual steam outlet pipe 13. The residual steam reuse outlet of the residual steam recovery and reuse manifold 14 is connected to the residual steam reuse main pipe 15, so as to supply steam to the outside through program control of different storage tanks 500, 400, and 200 according to external steam demands, such as for steam used in pouring, paint drying, and wax melting.

[0062] Meanwhile, since a large amount of surplus steam is collected, the surplus steam that cannot be fully consumed by the process of the aerated brick or board production line can also be supplied to the concrete heating and steaming process in the PC production workshop.

[0063] Although the present utility model has been described in detail through the above embodiments, the present utility model is not limited to the above embodiments. Without departing from the concept of the present utility model, any modification or equivalent replacement of the technical solutions of the embodiments of the present utility model should not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An autoclave waste heat recovery system, characterized in that: The system includes: A waste steam recovery high-pressure steam storage tank (500) has an input interface connected to the outlet of the fourth waste steam introduction pipe (10) and is used to introduce the high-pressure waste steam into the waste steam recovery high-pressure steam storage tank (500) through the fourth waste steam introduction pipe (10) during the initial steam exhaust stage of the autoclave, and an output interface connected to the inlet of the first waste steam outlet pipe (11); The residual steam recovery low-pressure steam storage tank (400) has an input interface connected to the outlet of the third residual steam introduction pipe (9) and is used to introduce the residual steam into the residual steam recovery low-pressure steam storage tank (400) through the third residual steam introduction pipe (9) when the exhaust steam pressure of the autoclave is lower than the first pressure value or the residual steam pressure is insufficient to continue to be pressed into the residual steam recovery high-pressure steam storage tank (500), and the output interface is connected to the inlet of the second residual steam outlet pipe (12); A condensate recovery high-temperature water storage tank (200) has a first input interface connected to the outlet of a first residual steam introduction pipe (7) and is used to introduce residual steam into the condensate recovery high-temperature water storage tank (200) through the first residual steam introduction pipe (7) when the exhaust steam pressure of the autoclave is lower than a second pressure value or the residual steam pressure is insufficient to continue to be pressed into the residual steam recovery high-pressure steam storage tank (500) and the residual steam recovery low-pressure steam storage tank (400); a second input interface connected to the autoclave high-pressure condensate main pipe (17); a first output interface connected to the inlet of a third residual steam outlet pipe (13); and a second output interface connected to a high-temperature hot water outlet pipe (20); The condensate recovery low-temperature water storage tank (300) has a first input interface connected to the outlet of the second residual steam introduction pipe (8) and is used to introduce the residual steam into the condensate recovery low-temperature water storage tank (300) through the second residual steam introduction pipe (8) when the exhaust steam pressure of the autoclave is lower than the third pressure value or the residual steam pressure is insufficient to continue to be pressed into the residual steam recovery high-pressure steam storage tank (500), the residual steam recovery low-pressure steam storage tank (400) and the condensate recovery high-temperature water storage tank (200). The second input interface is connected to the autoclave low-pressure condensate main pipe (18), the third input interface is connected to the autoclave normal-pressure condensate main pipe (19), and the output interface is connected to the low-temperature hot water output pipe (21).

2. The autoclave waste heat recovery system according to claim 1, characterized in that: The system also includes: The residual steam recovery and classification storage sub-cylinder (6) comprises a residual steam inlet and four residual steam outlets, wherein the residual steam inlet is connected to the autoclave residual steam recovery main pipe (5), the first residual steam outlet is connected to the inlet of the first residual steam introduction pipe (7), the second residual steam outlet is connected to the inlet of the second residual steam introduction pipe (8), the third residual steam outlet is connected to the inlet of the third residual steam introduction pipe (9), and the fourth residual steam outlet is connected to the inlet of the fourth residual steam introduction pipe (10).

3. The autoclave waste heat recovery system according to claim 1, characterized in that: The system also includes: The condensate drainage cylinder (16) comprises a condensate inlet and three condensate outlets. The condensate inlet is connected to the condensate drainage outlet of the autoclave (100). The three condensate outlets are respectively connected to the high-pressure condensate main pipe (17), the low-pressure condensate main pipe (18) and the normal-pressure condensate main pipe (19).

4. The autoclave waste heat recovery system according to claim 1, characterized in that: The system also includes: The autoclave residual steam recovery collection cylinder (4) has an inlet connected to the exhaust pipes of each autoclave (100) through an autoclave residual steam exhaust pipe, and an outlet connected to an autoclave residual steam recovery main pipe (5).

5. The autoclave waste heat recovery system according to claim 1, characterized in that: The system also includes: The residual steam recovery and recycling sub-cylinder (14) comprises three residual steam recovery inlets and one residual steam recycling outlet. The three residual steam recovery inlets are respectively connected to a first residual steam outlet pipe (11), a second residual steam outlet pipe (12), and a third residual steam outlet pipe (13). The residual steam recycling outlet is connected to a residual steam recycling main pipe (15).

6. The autoclave waste heat recovery system according to claim 1, characterized in that: The high-temperature hot water output pipe (20) provides heat energy to the first heat-using system (24) through the first heat exchanger, and the low-temperature hot water output pipe (21) provides heat energy to the second heat-using system (25) through the second heat exchanger.

7. The autoclave waste heat recovery system according to claim 6, characterized in that: The first heat utilization system (24) includes drying systems in the resting area and the marshaling area.

8. The autoclave waste heat recovery system according to claim 1, characterized in that: The residual steam recovery low-pressure steam storage tank (400) and / or the residual steam recovery high-pressure steam storage tank (500) further include a condensate output interface, which is connected to the high-temperature hot water output pipe (20) via a high-temperature hot water pipe, and the condensate output interface or the high-temperature hot water pipe is provided with a switch control valve.

9. The autoclave waste heat recovery system according to claim 1, characterized in that: Each autoclave (100) is provided with a corresponding condensate drainage cylinder (16), the condensate inlet of the condensate drainage cylinder (16) is connected to the condensate drainage outlet provided at the bottom of the corresponding autoclave (100), and the three condensate outlets of each condensate drainage cylinder (16) are respectively connected to the high-pressure condensate main pipe (17), the low-pressure condensate main pipe (18), and the normal-pressure condensate main pipe (19) through the high-pressure condensate pipe, the low-pressure condensate pipe, and the normal-pressure condensate pipe.

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