Steam exhaust waste heat recovery device for still kettle

Abstract

The utility model provides a steam exhaust waste heat recovery device of a still kettle. The steam exhaust waste heat recovery device comprises a heat exchanger, a hot well, a spraying system, a main pipeline, a first steam inlet pipeline, a second steam inlet pipeline and a heat exchange circulation pipeline. The bottom of the heat exchanger communicates with the hot well; one end of the main pipeline is connected with a steam exhaust pipeline of the still kettle, the other end of the main pipeline is connected with the first steam inlet pipeline and the second steam inlet pipeline, the first steam inlet pipeline is connected with a top steam inlet of the heat exchanger, and the second steam inlet pipeline is connected with a hot well; one end of the spraying system is connected with a bottom connector of the hot well, and a spraying device of the spraying system is arranged in the heat exchanger. According to the steam exhaust waste heat recovery device for the still kettle, the problem that a large amount of waste heat is wasted due to the fact that a waste heat recovery device in the related technology cannot rapidly and effectively absorb and transfer heat is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat recovery, and particularly relates to a waste steam heat recovery device for an autoclave. Background Art

[0002] Autoclaves are widely used and are commonly used for autoclave curing of building materials such as aerated concrete blocks, concrete pipe piles, grey sand bricks, coal ash bricks, micro-porous calcium silicate boards, new lightweight wall materials, heat-insulating asbestos boards, high-strength gypsum, and calcium silicate boards. The conventional heat source is saturated steam at 1.0 - 1.5 MPa. After autoclave curing, the saturated steam is discharged naturally. Currently, most enterprises directly discharge the waste steam into the atmosphere without recovery, and a small number of enterprises use ordinary heat exchangers for recovery but cannot completely recover the waste steam heat, resulting in relatively serious direct waste of this part of thermal energy. At the same time, during the autoclave curing process, the waste steam of some enterprises contains alkalis and organic particles, resulting in a relatively large odor of the discharged waste steam, which has a great negative impact on the environment of the enterprise.

[0003] Therefore, the technology of waste steam heat recovery and reuse for autoclaves can not only utilize the wasted waste steam heat, but also condense the waste steam into water and then discharge it, which can further eliminate the environmental impact of the waste steam odor and obtain economic and environmental benefits at the same time. The waste steam pressure of the autoclave is unstable, the initial exhaust pressure is large and the rate is high, and the exhaust flow rate is low and the exhaust is difficult at the end. Due to the inability of the waste heat recovery device in the related technology to quickly and effectively absorb and transfer heat, a large amount of waste heat is wasted. Summary of the Invention

[0004] In view of this, the utility model aims to solve at least one of the related technical problems to a certain extent.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A waste steam heat recovery device for an autoclave, comprising a heat exchanger, a hot well, a spray system, a main pipeline, a first steam inlet pipeline, a second steam inlet pipeline, and a heat exchange circulation pipeline;

[0007] The bottom of the heat exchanger is communicated with the hot well;

[0008] One end of the main pipeline is connected to the exhaust pipeline of the autoclave, the other end of the main pipeline is connected to the first steam inlet pipeline and the second steam inlet pipeline. The first steam inlet pipeline is used for connecting the top steam inlet of the heat exchanger, and the second steam inlet pipeline is used for connecting the hot well;

[0009] One end of the spray system is connected to the bottom interface of the hot well, and the spray device of the spray system is arranged inside the heat exchanger;

[0010] The heated end of the heat exchange circulation pipeline is arranged inside the heat exchanger. One end of the heat exchange circulation pipeline is connected to the water supply end, and the other end of the heat exchange circulation pipeline is connected to the heat storage tank.

[0011] Furthermore, it also includes an extraction steam system. The extraction steam system includes a first extraction steam port, a second extraction steam port, a first control valve, and an induced draft fan. The first extraction steam port and the second extraction steam port are symmetrically arranged on the abdomen of the heat exchanger. Both the first extraction steam port and the second extraction steam port are connected to the first control valve through pipelines, and the first control valve is connected to the induced draft fan.

[0012] Furthermore, the spray system includes a circulating water pump and a spray device. One end of the circulating water pump is connected to the hot well through the bottom interface of the hot well, the other end of the circulating water pump is connected to the spray inlet of the spray device, and the spray device is arranged inside the heat exchanger.

[0013] Furthermore, the second steam inlet pipeline is connected to the top inlet of the hot well through a mixed heating valve group.

[0014] Furthermore, it also includes a heat exchange tube bundle. The heat exchange tube bundle is arranged inside the hot well. The heat exchange tube bundle is connected to the heat exchange circulation pipeline. The internal tube bundle of the heat exchange circulation pipeline and the arrangement of the heat exchange tube bundle are both in a strip layout.

[0015] Furthermore, the bottom of the hot well is connected to a drainage pool through a second control valve.

[0016] Furthermore, the water supply end is self-softened water supply.

[0017] Compared with the prior art, the autoclave waste steam waste heat recovery device of the present utility model has the following advantages:

[0018] 1. Aiming at the exhaust characteristics of the autoclave, in order to enable the steam to better contact and exchange heat with the heat exchange tube bundle, the steam is divided into two inlet paths. The first steam inlet pipeline directly enters the top of the heat exchanger and then exchanges heat from top to bottom. The second steam inlet pipeline is sent to the top inlet of the hot well through a mixed heating valve group and exchanges heat from bottom to top, so as to achieve the effect of uniformly exchanging heat and condensing the steam with a lower flow rate, ensuring the stable exhaust of the autoclave and not affecting the exhaust curve of the autoclave.

[0019] 2. According to the characteristics of the large exhaust pressure and high rate at the initial stage of the autoclave, a spray system is installed. The system consists of a circulating water pump and a spray device. The spray system is turned on when the exhaust condensation rate is relatively low, so that the waste steam waste heat recovery device can quickly condense the steam in the initial exhaust stage. The opening and closing of the spray system are automatically controlled. The water source for spraying is taken from the condensed water of the exhaust, which belongs to the recirculation of internal water and does not increase the water consumption additionally.

[0020] 3. According to the characteristics of low exhaust steam flow rate and difficult exhaust at the end stage of the autoclave, an extraction steam system is installed. The system consists of a control valve and an induced draft fan. Two extraction steam ports are arranged on both sides of the abdomen of the waste heat recovery device, providing external power for the exhaust steam at the end stage of the autoclave and eliminating the phenomenon of manual exhaust in the workshop at the end stage of the autoclave. The operation of the extraction steam system is automatically controlled by the exhaust rate feedback signal, and the autoclave can be opened without manual exhaust after the exhaust is completed.

[0021] 4. The exhausted steam contains some oil vapor, and the condensed water contains some oil contaminants. The design of the exhausted steam waste heat recovery device comprehensively considers the influence of oil contaminants. The internal tube bundle of the heat exchange circulation pipeline and the arrangement of the heat exchange tube bundles are both in a strip layout to reduce the adhesion of oil contaminants. Description of the Drawings

[0022] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0023] Figure 1 It is a schematic structural diagram of an exhausted steam waste heat recovery device for an autoclave according to an embodiment of the present utility model.

[0024] Description of the reference numerals in the drawings:

[0025] 1. Heat exchanger; 2. Top steam inlet; 3. Mixing and heating valve group; 4. Top inlet of the hot well; 5. Circulating water pump; 6. Spraying device; 7. Bottom interface of the hot well; 8. Spraying inlet; 9. First control valve; 10. Induced draft fan; 11. First extraction steam port; 12. Second extraction steam port; 13. Hot well. Detailed Embodiment

[0026] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0029] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0030] An autoclave waste steam heat recovery device, as Figure 1 shown, includes a heat exchanger 1, a hot well 13, a spray system, a main pipe, a first steam inlet pipe, a second steam inlet pipe, and a heat exchange circulation pipe; the bottom of the heat exchanger 1 is communicated with the hot well 13; one end of the main pipe is connected to the autoclave exhaust pipe, and the other end of the main pipe is connected to the first steam inlet pipe and the second steam inlet pipe. The first steam inlet pipe is used to connect to the top steam inlet 2 of the heat exchanger 1, and the second steam inlet pipe is used to connect to the hot well 13; one end of the spray system is connected to the bottom interface of the hot well 13, and the spray device of the spray system is arranged inside the heat exchanger 1; the heat receiving end of the heat exchange circulation pipe is arranged inside the heat exchanger 1, one end of the heat exchange circulation pipe is connected to the water supply end, and the other end of the heat exchange circulation pipe is connected to the heat storage tank. In view of the exhaust characteristics of the autoclave, in order to enable the steam to better contact and exchange heat with the heat exchange tubes, the steam is divided into two inlet paths. The first steam inlet pipe directly enters the top of the heat exchanger 1 and then exchanges heat from top to bottom. The second steam inlet pipe is sent to the top inlet 4 of the hot well 13 through the mixing and heating valve group 3 and exchanges heat from bottom to top, so as to achieve the effect of uniformly exchanging heat and condensing the steam with a lower flow rate, ensuring the stable exhaust of the autoclave and not affecting the exhaust curve of the autoclave.

[0031] It also includes an extraction steam system, which includes a first extraction steam port 11, a second extraction steam port 12, a first control valve 9 and an induced draft fan 10. The first extraction steam port 11 and the second extraction steam port 12 are symmetrically arranged on the abdomen of the heat exchanger 1. Both the first extraction steam port 11 and the second extraction steam port 12 are connected to the first control valve 9 through pipelines, and the first control valve 9 is connected to the induced draft fan 10. According to the characteristics of low exhaust steam flow rate and difficult exhaust in the late stage of the autoclave, the extraction steam system provides external power for the exhaust in the late stage of the autoclave, eliminating the phenomenon of manual exhaust in the workshop in the late stage of the autoclave. The operation of the extraction steam system is automatically controlled through an exhaust rate feedback signal, and the autoclave can be opened without manual exhaust after the exhaust is completed.

[0032] Working principle of the extraction steam system: During normal operation, the induced draft fan 10 is turned on regularly (30 minutes) for 2 minutes to discharge the non-condensable gas inside the waste heat recovery device; in the late stage of exhaust, when it is difficult to exhaust by natural pressure relief in the autoclave, the induced draft fan 10 is turned on for 10 - 20 minutes.

[0033] The spray system includes a circulating water pump 5 and a spray device 6. One end of the circulating water pump 5 is connected to the hot well 13 through the bottom interface 7 of the hot well 13, and the other end of the circulating water pump 5 is connected to the spray inlet 8 of the spray device 6. The spray device 6 is arranged inside the heat exchanger 1. According to the characteristics of high exhaust steam pressure and high rate in the initial stage of the autoclave, a spray system is installed on the heat exchanger 1. The spray system is turned on when the exhaust condensation rate is relatively low, enabling the waste heat recovery device for exhausted steam to quickly condense the steam in the initial exhaust stage. The opening and closing of the spray system are automatically controlled, and the water source for spraying is taken from the condensed water of the exhaust, belonging to the recirculation of internal water without additional water consumption. Working principle of the spray system: Part of the condensed water is sent from the bottom interface 7 of the hot well 13 to the top spray inlet 8 through the circulating water pump 5 and the supporting valve group, and the hot well 13 condensed water spray recirculation system is turned on when the exhaust condensation rate is relatively low.

[0034] It also includes heat exchange tubes, which are arranged in the hot well 13. The heat exchange tubes are connected to the heat exchange circulation pipeline. The internal tubes of the heat exchange circulation pipeline and the arrangement of the heat exchange tubes are both in a strip layout. The exhausted steam contains some oil vapor, and the condensed water contains some oil stains. The design of the waste heat recovery device for exhausted steam comprehensively considers the influence of oil stains. The internal tubes of the heat exchange circulation pipeline and the arrangement of the heat exchange tubes are both in a strip layout to reduce the adhesion of oil stains. The bottom of the hot well 13 is connected to the drainage tank through a second control valve. The water supply end is softened water supply.

[0035] Working mode of this example

[0036] It is connected to the existing exhaust steam pipeline of the autoclave, introducing the existing directly exhausted steam into the waste heat recovery device for exhausted steam, without the need to modify the existing autoclave and without affecting the exhaust curve of the existing autoclave.

[0037] In the initial stage of the autoclave exhausting steam, the control system turns on the spray system to recover the heat of the remaining steam with high pressure and high flow rate in the initial stage; in the middle stage of the autoclave exhausting steam, the cooling water regulating valve is adjusted according to the feedback of the heat output temperature, and at the same time, the spray system is turned off to recover the heat of the remaining steam in the middle stage; in the final stage of the autoclave exhausting steam, the cooling water regulating valve is adjusted according to the feedback of the heat output temperature, and at the same time, the induced draft fan 10 is turned on to promote the discharge and heat exchange of the remaining steam with low pressure and low flow rate in the final stage, and eliminate the phenomenon of manual steam exhaust in the workshop.

[0038] According to the operating principle, the waste steam waste heat recovery device recovers as much heat as possible from the unstable heat source of the waste steam of the existing autoclave through minimal transformation of the existing autoclave, and at the same time eliminates the phenomena of large white smoke and strong odor in the existing waste steam exhaust. It is a technology for energy conservation, environmental protection, carbon reduction and improvement of the factory environment. This device overcomes the characteristics of unstable waste steam pressure of the autoclave, large initial exhaust pressure and high rate, and difficult exhaust with low exhaust flow rate in the final stage.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An autoclave waste steam waste heat recovery device, characterized in that: It includes a heat exchanger (1), a hot well (13), a spray system, a main pipeline, a first steam inlet pipeline, a second steam inlet pipeline and a heat exchange circulation pipeline; The bottom of the heat exchanger (1) is communicated with the hot well (13); One end of the main pipeline is connected to the steam exhaust pipeline of the autoclave, and the other end of the main pipeline is connected to the first steam inlet pipeline and the second steam inlet pipeline. The first steam inlet pipeline is used to connect the top steam inlet (2) of the heat exchanger (1), and the second steam inlet pipeline is used to connect the hot well (13); One end of the spray system is connected to the bottom interface of the hot well (13), and the spray device of the spray system is arranged inside the heat exchanger (1); The heat receiving end of the heat exchange circulation pipeline is arranged inside the heat exchanger (1). One end of the heat exchange circulation pipeline is connected to the water supply end, and the other end of the heat exchange circulation pipeline is connected to the heat storage tank.

2. The waste steam heat recovery device for an autoclave according to claim 1, wherein: It also includes an extraction system. The extraction system includes a first extraction port (11), a second extraction port (12), a first control valve (9) and an induced draft fan (10). The first extraction port (11) and the second extraction port (12) are symmetrically arranged on the abdomen of the heat exchanger (1). The first extraction port (11) and the second extraction port (12) are both connected to the first control valve (9) through pipelines, and the first control valve (9) is connected to the induced draft fan (10).

3. The waste steam heat recovery device for an autoclave according to claim 1, characterized in that: The spray system includes a circulating water pump (5) and a spray device (6). One end of the circulating water pump (5) is connected to the hot well (13) through the bottom interface (7) of the hot well (13), and the other end of the circulating water pump (5) is connected to the spray inlet (8) of the spray device (6). The spray device (6) is arranged inside the heat exchanger (1).

4. An autoclave waste steam waste heat recovery device according to any one of claims 1-3, characterized in that: The second steam inlet pipeline is connected to the top inlet (4) of the hot well (13) through a mixing and heating valve group (3).

5. The waste steam heat recovery device for an autoclave according to claim 4, characterized in that: It also includes a heat exchange tube bundle. The heat exchange tube bundle is arranged in the hot well (13). The heat exchange tube bundle is connected to the heat exchange circulation pipeline. The internal tube bundle of the heat exchange circulation pipeline and the arrangement of the heat exchange tube bundle are both in a strip layout.

6. The waste steam heat recovery device for an autoclave according to claim 4, characterized in that: The bottom of the hot well (13) is connected to the drainage pool through a second control valve.

7. The autoclave waste steam waste heat recovery device according to claim 4, characterized in that: The water supply end is self-softened water supply.

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