Heat preservation jacket structure and preparation method thereof

Abstract

The invention provides a heat preservation jacket structure and a preparation method thereof, and belongs to the field of pipeline engineering design. The heat preservation jacket structure comprises a first jacket body and a second jacket body, and the first jacket body and the second jacket body are detachably connected to form a barrel structure with the two ends open. The interior of the first jacket body and the interior of the second jacket body are each of a cavity structure, namely, a heat conduction chamber. During assembly, the first jacket body and the second jacket body are respectively arranged at the flange-containing joint of a valve needing heat preservation, and are connected through bolts, so that the jacket structure can be repeatedly used, the purpose of reducing the purchase cost is achieved, meanwhile, the machining and welding process during existing jacket assembly is avoided, and the production efficiency is improved. The valve or the flange is prevented from being perforated and looped in the machining and welding process, and the heat transfer effect is improved.

Description

Technical Field

[0001] The invention belongs to the field of pipeline engineering design, and particularly relates to a thermal insulation jacket structure and a preparation method thereof. Background Art

[0002] In chemical plants, valves and flange connections are widely used on pipelines. In the chemical production process, in order to prevent the easily solidified medium transported in the pipeline from condensing at the valve or flange connection and blocking the pipeline, a jacket structure is required to insulate the valve and flange connection.

[0003] In the prior art, the jacket structure is mostly an integral jacket. The installation position of the jacket layer is limited by the space position such as the valve body or the flange of the cross-connection point. The jacket layer space of the final product is limited and leaks are prone to occur. In addition, the existing jacket structure is directly welded to the valve body, and the steam is in direct contact with the valve body, which will cause erosion and scouring to the valve. At the same time, the jacket and the valve body cannot be disassembled, which is not convenient for the later maintenance and repair of the valve. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, to provide a thermal insulation jacket structure and a preparation method thereof, to improve the heat transfer effect, and the jacket structure can be detachably connected and can be repeatedly used.

[0005] One of the purposes of the present invention is to provide a thermal insulation jacket structure.

[0006] A second object of the present invention is to provide a method for preparing a thermal insulation jacket structure.

[0007] The present invention is achieved through the following technical solutions:

[0008] In a first aspect, the present invention provides a heat-insulating jacket structure, comprising a first jacket body and a second jacket body, wherein the first jacket body and the second jacket body are detachably connected to form a cylindrical structure with openings at both ends;

[0009] The first jacket body and the second jacket body both have a hollow structure inside, namely, a heat transfer chamber.

[0010] A further improvement of the present invention is:

[0011] The first jacket body and the second jacket body are integral castings made of high temperature resistant heat conductive material, wherein the heat conductive material is selected according to the insulation temperature requirement of the pipeline and the corresponding total heat loss is calculated in combination with heat conduction;

[0012] Usually, a layer of insulation material is wrapped on the outer wall of the pipe that needs insulation, and the thermal conductivity and thickness of the insulation material are both known values;

[0013] The thermal conductivity difference K between the insulation material and the jacket material is calculated by formula (1):

[0014]

[0015] Among them, B1 is the jacket wall thickness, which is an estimated value based on the actual normal insulation thickness requirements of the pipeline, in mm; B2 is the thickness of the insulation material, in mm; λ1 is the thermal conductivity of the jacket material, in W / m 2 K; λ2 is the thermal conductivity of the insulation material, unit W / m 2 K; b is the thermal conductivity of outdoor air, which is 50W / m 2 K;

[0016] When calculating the thermal conductivity difference K, the jacket material is one or more thermally conductive materials given in advance, and the thermal conductivity λ1 of the thermally conductive material is a known value. The thermal conductivity difference K is calculated using formula (1), and then the total heat loss Q1 is calculated. If the calculated total heat loss Q1 is within the effective range, the estimated jacket thickness and thermally conductive material are selected as the wall thickness and thermally conductive material of the first jacket body and the second jacket body.

[0017] A further improvement of the present invention is:

[0018] The total heat loss Q1 is calculated by formula (2):

[0019]

[0020] Among them, T1 is the temperature of the heating medium, T2 is the ambient temperature (extreme conditions), and A1 is the actual heated area.

[0021] A further improvement of the present invention is:

[0022] At least one first bolt connection part is provided at the outer wall edges of both sides of the first jacket body along the axial direction, and a first bolt through hole is provided on the first bolt connection part;

[0023] At least one second bolt connection part is provided at the outer wall edges of both sides of the second jacket body along the axial direction, and a second bolt through hole is provided on the second bolt connection part;

[0024] The number and positions of the second bolt connection parts are adapted to the number and positions of the first bolt connection parts.

[0025] A further improvement of the present invention is:

[0026] The first jacket body and the second jacket body are fastened and connected via at least one buckle.

[0027] A further improvement of the present invention is:

[0028] The first jacket body is provided with a first medium inlet and a first medium outlet respectively, and the first medium inlet and the first medium outlet are both communicated with the heat conduction chamber on the first jacket body.

[0029] A further improvement of the present invention is:

[0030] The second jacket body is provided with a second medium inlet and a second medium outlet, respectively. The second medium inlet and the second medium outlet are both communicated with the heat conduction chamber on the second jacket body.

[0031] A further improvement of the present invention is:

[0032] The first jacket body and the second jacket body wrap the heat-insulating part of the pipeline as a whole, and the space between the first jacket body and the second jacket body and the heat-insulating part of the pipeline is filled with heat-conducting heat medium;

[0033] The heat-conducting medium is heat-conducting paste, heat-conducting silica gel or other materials with good heat-conducting properties.

[0034] A second aspect of the present invention provides a method for preparing a thermal insulation jacket structure, which specifically comprises the following steps:

[0035] Step 1, first determine the thermal conductive material and wall thickness of the first jacket body and the second jacket body;

[0036] Step 2, making a mold according to the thickness determined in step 1;

[0037] Step 3, melting the heat-conducting material determined in step 1 into liquid, and then casting it into the mold made in step 2 to shape it, thereby obtaining the first jacket body and the second jacket body.

[0038] A further improvement of the present invention is:

[0039] In step 1, the heat conductive material and wall thickness of the first jacket body and the second jacket body are first determined, and the specific operations include:

[0040] According to the actual normal insulation thickness requirements of the pipeline, the jacket thickness B1 is estimated, and the thermal conductive material is selected. The thermal conductivity of the thermal conductive material is λ1.

[0041] Usually, a layer of insulation material is wrapped on the outer wall of the transmission pipeline, and the thermal conductivity λ2 and thickness B2 of the insulation material are both known values;

[0042] The thermal conductivity difference K between the insulation material and the jacket material is calculated according to formula (1):

[0043]

[0044] Where b is the thermal conductivity of outdoor air, which is 50W / m2 K;

[0045] Then calculate the total heat loss Q1 according to formula (2):

[0046]

[0047] Among them, T1 is the temperature of the heating medium, T2 is the ambient temperature (extreme conditions), and A1 is the actual heated area.

[0048] If the calculated total heat loss Q1 is within the effective range, the estimated jacket thickness and thermal conductive material are selected as the thickness and thermal conductive material of the first jacket body and the second jacket body.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] During assembly, the first jacket body and the second jacket body are respectively placed at the flange connection of the valve that needs to be insulated, and the first jacket body and the second jacket body are connected by bolts, so that the jacket structure can be repeatedly used for many times, thereby achieving the purpose of reducing procurement costs, and at the same time avoiding the processing and welding process during the existing assembly of the jacket, and preventing the valve or flange from being perforated and leaking during the processing and welding process; the gap between the first jacket body, the second jacket body and the valve flange is filled with a heat medium (for example, heat-conducting cement) to prevent heat loss, transfer effective heat to the inner cavity surface of the valve, completely isolate the hot oil flow channel from the medium flow channel, and eliminate the possibility of the heat-conducting medium and the medium in the flange connection of the valve, thereby eliminating the influence of hot oil leakage on the polymer medium due to welding quality.

[0051] Compared with the traditional jacket, the present invention improves the heat transfer effect, ensures that the temperature transferred to the inner cavity of the valve is more evenly distributed and the temperature control is more stable; the operating temperature of the present invention can reach above 400°C, and the pressure resistance is significantly improved, which can meet the needs of most devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural schematic diagram of a thermal insulation jacket structure of the present invention;

[0053] Figure 2 It is a structural schematic diagram of another thermal insulation jacket structure of the present invention.

[0054] In the figure,

[0055] 1. first jacket body, 101. first bolt connection part, 102. first medium inlet, 103. first medium outlet;

[0056] 2. Second jacket body, 201. Second bolt connection part, 202. Second medium inlet, 203. Second medium outlet. DETAILED DESCRIPTION

[0057] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0058] [Example 1]

[0059] The embodiment of the present invention provides a heat preservation jacket structure, such as Figure 1 and Figure 2 As shown, it comprises a first jacket body 1 and a second jacket body 2, wherein the first jacket body 1 and the second jacket body 2 are detachably connected to form a cylindrical structure with openings at both ends;

[0060] The first jacket body 1 and the second jacket body 2 both have a hollow structure inside, namely, a heat transfer chamber.

[0061] The shapes of the first jacket body 1 and the second jacket body 2 can be adjusted according to the shapes of the valve or pipe that needs to be insulated, for example, they can be spherical, cubic or other shapes. Preferably, the first jacket body 1 and the second jacket body 2 are adapted to the size of the valve or pipe that needs to be insulated.

[0062] The first jacket body 1 and the second jacket body 2 are connected by bolts, so that the jacket structure can be reused multiple times, reducing costs, while avoiding the processing and welding process when assembling the existing jacket, preventing perforations and holes in the valve or pipeline flange during the processing and welding process, and preventing some high-temperature heat transfer oil media from penetrating into the valve or pipeline medium through the welding leak point to pollute the medium.

[0063] In the present invention, the first jacket body 1 and the second jacket body 2 are both integrally cast and molded structures, and the heat transfer chamber is a cavity structure. There is no need to set internal parts such as baffles and diverter plates inside. There is no dead zone in the flow channel, ensuring that the flow field in the flow channel is evenly distributed, thereby achieving stable and uniform heat exchange.

[0064] [Example 2]

[0065] The first jacket body 1 and the second jacket body 2 are integral castings made of high temperature resistant heat conductive material, wherein the heat conductive material is selected according to the insulation temperature requirement of the pipeline and the corresponding heat conversion efficiency is calculated in combination with heat conduction.

[0066] Usually, a layer of insulation material may be wrapped on the outer wall of the transmission pipeline, and the thermal conductivity and thickness of the insulation material are known.

[0067] The thermal conductivity difference K between the insulation material and the jacket material is calculated by formula (1):

[0068]

[0069] Wherein, B1 is the jacket wall thickness, in mm; B2 is the thickness of the insulation material, in mm; λ1 is the thermal conductivity of the jacket material, in W / m2 K; λ2 is the thermal conductivity of the insulation material, unit W / m 2 K; b is the thermal conductivity of outdoor air, which is 50W / m 2 K;

[0070] Among them, the jacket wall thickness B1 is an estimated value based on the normal insulation thickness requirements of the actual pipeline. The jacket wall thickness is different for different jacket cavity positions.

[0071] When calculating the thermal conductivity difference K, the jacket material is one or more thermally conductive materials given in advance, and the thermal conductivity λ1 of the thermally conductive material is a known value. The thermal conductivity difference K is calculated using formula (1), and then the total heat loss Q1 is calculated. If the calculated total heat loss Q1 is within the effective range, the estimated jacket thickness and thermally conductive material are selected as the wall thickness and thermally conductive material of the first jacket body and the second jacket body.

[0072] The total heat loss Q1 is calculated by formula (2):

[0073]

[0074] Among them, T1 is the temperature of the heating medium, T2 is the ambient temperature (extreme conditions), and A1 is the actual heated area of ​​the pipeline.

[0075] [Example 3]

[0076] At least one first bolt connection part 101 is provided at the outer wall edges of both sides of the first jacket body 1 along the axial direction, and a first bolt through hole is provided on the first bolt connection part 101;

[0077] At least one second bolt connection part 201 is provided at the outer wall edges on both sides of the second jacket body 2 along the axial direction, and a second bolt through hole is provided on the second bolt connection part 201. The number and position of the second bolt connection parts 201 are adapted to the number and position of the first bolt connection parts 101.

[0078] During assembly, the bolts are passed through the first bolt through hole and the second bolt through hole in sequence and fastened with nuts, so that the jacket structure can be reused many times, reducing costs and avoiding the processing and welding process during the existing assembly of the jacket, preventing perforations and holes in the valve or pipeline flange during the processing and welding process, and preventing some high-temperature heat transfer oil media from penetrating into the valve or pipeline media through the welding leaks and contaminating the media.

[0079] Furthermore, if Figure 2 As shown, the first jacket body 1 and the second jacket body 2 are fastened together by at least one buckle, so as to further fasten the first jacket body 1 and the second jacket body 2.

[0080] [Example 4]

[0081] The first jacket body 1 is provided with a first medium inlet 102 and a first medium outlet 103, both of which are connected to the heat transfer chamber on the first jacket body 1. The heating medium (hot oil) enters the heat transfer chamber through the first medium inlet 102 to achieve heat preservation of the heat preservation pipe, and finally flows out from the first medium outlet 103.

[0082] The second jacket body 2 is respectively provided with a second medium inlet 202 and a second medium outlet 203, which are both connected to the heat transfer chamber on the second jacket body 2. The heating medium (hot oil) enters the heat transfer chamber through the second medium inlet 202 to achieve heat preservation of the insulation pipe, and finally flows out from the second medium outlet 203.

[0083] [Example 5]

[0084] The first jacket body 1 and the second jacket body 2 wrap the entirety of the heat-insulating portion of the pipeline therein, and the first jacket body 1 and the second jacket body 2 are adapted to the structure of the heat-insulating portion of the pipeline.

[0085] The first jacket body 1 and the second jacket body 2 are filled with heat-conducting medium between the pipe insulation part, so that the heat in the heat-conducting chamber can be better and more effectively transferred to the pipe insulation part to prevent heat loss. When the medium in the pipe insulation part leaks or seeps, it will only contact with the heat-conducting medium and will not directly contact with the heat-conducting medium in the heat-conducting chamber, thus avoiding safety hazards.

[0086] The heat-conducting medium can be thermally conductive paste, thermally conductive silica gel or other materials with good thermal conductivity. Due to the good thermal conductivity of thermally conductive paste and the ability to well match the shape of the gap, in the present invention, the heat-conducting medium is preferably thermally conductive paste.

[0087] [Example 6]

[0088] The embodiment of the present invention provides a method for preparing a thermal insulation jacket structure, which specifically comprises the following steps:

[0089] Step 1, first determine the thermal conductive material and wall thickness of the first jacket body 1 and the second jacket body 2, specifically:

[0090] According to the actual normal insulation thickness requirements of the pipeline, the jacket wall thickness B1 is estimated, and the thermal conductive material is selected. The thermal conductivity of the thermal conductive material is λ1.

[0091] Usually, a layer of insulation material may be wrapped on the outer wall of the transmission pipeline, and the thermal conductivity λ2 and thickness B2 of the insulation material are both known values;

[0092] The thermal conductivity difference K between the insulation material and the jacket material is calculated according to formula (1):

[0093]

[0094] Wherein, B1 is the jacket wall thickness, in mm; B2 is the thickness of the insulation material, in mm; λ1 is the thermal conductivity of the jacket material, in W / m 2 K; λ2 is the thermal conductivity of the insulation material, unit W / m 2 K; b is the thermal conductivity of outdoor air, which is 50W / m 2 K;

[0095] Then calculate the total heat loss Q1 according to formula (2):

[0096]

[0097] Among them, T1 is the temperature of the heating medium, T2 is the ambient temperature (extreme conditions), and A1 is the actual heated area of ​​the pipeline.

[0098] If the calculated total heat loss Q1 is within the effective range, the estimated jacket thickness and thermal conductive material are selected as the wall thickness and thermal conductive material of the first jacket body and the second jacket body.

[0099] Step 2, making a mold according to the wall thickness determined in step 1;

[0100] Step 3, melting the heat-conducting material determined in step 1 into liquid, and then casting it into the mold prepared in step 2 to shape it, thereby obtaining the first jacket body and the second jacket body.

[0101] The jacket structure of the present invention can be used repeatedly for many times, so as to achieve the purpose of reducing procurement costs, and at the same time avoid the processing and welding process when assembling the existing jacket, and prevent the valve or flange from being perforated and leaked during the processing and welding process; the gap between the first jacket body, the second jacket body and the valve is filled with a heat medium (for example, heat-conducting cement) to prevent heat loss, transfer effective heat to the inner cavity surface of the valve, completely isolate the hot oil flow channel from the medium flow channel, and eliminate the possibility of the heat-conducting medium and the medium in the valve and flange connection being mixed with each other, thereby eliminating the influence of hot oil leakage on the polymer medium due to welding quality.

[0102] Compared with the traditional jacket, the present invention improves the heat transfer effect, ensures that the temperature transferred to the inner cavity of the valve is more evenly distributed and the temperature control is more stable; the operating temperature of the present invention can reach above 400°C, and the pressure resistance is significantly improved, which can meet the needs of most devices.

[0103] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0104] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0105] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. A thermal insulation jacket structure, characterized in that: It comprises a first jacket body and a second jacket body, wherein the first jacket body and the second jacket body are detachably connected to form a cylindrical structure with openings at both ends; The first jacket body and the second jacket body both have a hollow structure inside, namely, a heat transfer chamber.

2. The thermal insulation jacket structure according to claim 1, characterized in that: The first jacket body and the second jacket body are integral castings made of high temperature resistant heat conductive material, wherein the heat conductive material is selected according to the insulation temperature requirement of the pipeline and the corresponding total heat loss is calculated in combination with heat conduction; Usually, a layer of insulation material is wrapped on the outer wall of the pipe that needs insulation, and the thermal conductivity and thickness of the insulation material are both known values; The thermal conductivity difference K between the insulation material and the jacket material is calculated by formula (1): Among them, B1 is the jacket wall thickness, which is an estimated value based on the actual normal insulation thickness requirements of the pipeline, in mm; B2 is the thickness of the insulation material, in mm; λ1 is the thermal conductivity of the jacket material, in W / m 2 K; λ2 is the thermal conductivity of the insulation material, unit W / m 2 K; b is the thermal conductivity of outdoor air, which is 50W / m 2 K; When calculating the thermal conductivity difference K, the jacket material is one or more thermally conductive materials given in advance, and the thermal conductivity λ1 of the thermally conductive material is a known value. The thermal conductivity difference K is calculated using formula (1), and then the total heat loss Q1 is calculated. If the calculated total heat loss Q1 is within the effective range, the estimated jacket wall thickness and thermally conductive material are selected as the wall thickness and thermally conductive material of the first jacket body and the second jacket body.

3. The thermal insulation jacket structure according to claim 2, characterized in that: The total heat loss Q1 is calculated by formula (2): Among them, T1 is the temperature of the heating medium, T2 is the ambient temperature, and A1 is the actual heated area.

4. The thermal insulation jacket structure according to claim 1, characterized in that: At least one first bolt connection part is provided at the outer wall edges of both sides of the first jacket body along the axial direction, and a first bolt through hole is provided on the first bolt connection part; At least one second bolt connection part is provided at the outer wall edges of both sides of the second jacket body along the axial direction, and a second bolt through hole is provided on the second bolt connection part; The number and positions of the second bolt connection parts are adapted to the number and positions of the first bolt connection parts.

5. The thermal insulation jacket structure according to claim 4, characterized in that: The first jacket body and the second jacket body are fastened and connected via at least one buckle.

6. The thermal insulation jacket structure according to claim 1, characterized in that: The first jacket body is provided with a first medium inlet and a first medium outlet respectively, and the first medium inlet and the first medium outlet are both communicated with the heat conduction chamber on the first jacket body.

7. The thermal insulation jacket structure according to claim 1, characterized in that: The second jacket body is provided with a second medium inlet and a second medium outlet, respectively. The second medium inlet and the second medium outlet are both communicated with the heat conduction chamber on the second jacket body.

8. The thermal insulation jacket structure according to claim 1, characterized in that: The first jacket body and the second jacket body wrap the heat-insulating part of the pipeline as a whole, and the space between the first jacket body and the second jacket body and the heat-insulating part of the pipeline is filled with heat-conducting heat medium; The heat-conducting medium is heat-conducting paste, heat-conducting silica gel or other materials with good heat-conducting properties.

9. A method for preparing a thermal insulation jacket structure, characterized in that: The specific steps include: Step 1, first determine the thermal conductive material and wall thickness of the first jacket body and the second jacket body; Step 2, making a mold according to the thickness determined in step 1; Step 3, melting the heat-conducting material determined in step 1 into liquid, and then casting it into the mold made in step 2 to shape it, thereby obtaining the first jacket body and the second jacket body.

10. The method for preparing the thermal insulation jacket structure according to claim 9, characterized in that: In step 1, the heat conductive material and wall thickness of the first jacket body and the second jacket body are first determined, and the specific operations include: According to the actual normal insulation thickness requirements of the pipeline, the jacket wall thickness B1 is estimated, and the thermal conductive material is selected. The thermal conductivity of the thermal conductive material is λ1. Usually, a layer of insulation material is wrapped on the outer wall of the transmission pipeline, and the thermal conductivity λ2 and thickness B2 of the insulation material are both known values; The thermal conductivity difference K between the insulation material and the jacket material is calculated according to formula (1): Where b is the thermal conductivity of outdoor air, which is 50W / m 2 K; Then calculate the total heat loss Q1 according to formula (2): Among them, T1 is the temperature of the heating medium, T2 is the ambient temperature, and A1 is the actual heated area. If the calculated total heat loss Q1 is within the effective range, the estimated jacket wall thickness and thermal conductive material are selected as the wall thickness and thermal conductive material of the first jacket body and the second jacket body.

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