Small-pipe-diameter waste heat boiler with inner heat preservation layer

Abstract

The utility model relates to the technical field of boiler waste heat recovery, in particular to a small-pipe-diameter waste heat boiler with an inner heat preservation layer. Comprising a boiler body, a plurality of small-pipe-diameter heat exchange elements are arranged in the boiler body, an inner heat preservation layer is arranged on the inner side of the boiler body, and the boiler body comprises an outer panel, heat preservation filler and a lining plate; a mounting hole is formed in the inner lining plate, a supporting stand column penetrates through the mounting hole, one end of the supporting stand column is connected to the outer panel, and the other end of the supporting stand column is mounted on the inner lining plate through a supporting gasket; a thermal insulation filler is filled between the outer panel and the inner lining panel; the small-pipe-diameter heat exchange elements are vertically arranged in the cavity of the boiler body and comprise tubular bodies and spiral fins, and the spiral fins are wound around the peripheries of the tubular bodies; the pipe diameter of the tubular body is 1 / 2 of the diameter of the spiral fins. The heat preservation and heat exchange efficiency of the boiler is improved through the boiler body, the heat preservation layer in the boiler body and the small-pipe-diameter heat exchange element.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler waste heat recovery, in particular to a small-diameter waste heat boiler with an inner insulation layer. Background Art

[0002] Conventional waste heat boilers often use large-diameter spiral finned tubes. However, the high fin height renders part of the heat exchange surface ineffective, thereby reducing heat exchange efficiency. Furthermore, large-diameter heat exchange elements increase the weight and floor space of the boiler. To address these technical challenges, technicians have made numerous attempts. For example, Chinese patent CN218821002U discloses a heat recovery device for a thermal oil waste heat boiler. This device has an insulating layer outside the boiler body and an internal heat exchange structure composed of several heat exchange tubes. Despite this, the solution still has several problems: first, the pipe diameter of the heat exchange element is too large or the layout is not reasonable, resulting in a limited number of heat exchange elements within the limited boiler volume and insufficient heat exchange area, which in turn affects the heat exchange efficiency and heat recovery; second, the material or number of layers of the insulation filler is insufficient, resulting in poor insulation effect, serious heat loss, and reduced thermal efficiency of the boiler; third, the thermal expansion and contraction problems of the steel structure and the airtight casing are not handled properly, affecting the stability and durability of the insulation layer; finally, the connection method between the boiler body and the bottom steel frame lacks flexibility, making it difficult to adapt to the rapid start-up of the unit and the high flow rate and turbulence of the flue gas emitted by the gas turbine, causing vibration, noise and other problems, and even posing a threat to the safety and stability of the boiler. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a small-diameter waste heat boiler with an inner insulation layer.

[0004] The technical solutions adopted in this utility model are as follows:

[0005] A small-diameter waste heat boiler with an inner insulation layer includes a boiler body, wherein the boiler body has a plurality of small-diameter heat exchange elements built therein, wherein:

[0006] The boiler body is provided with an inner insulation layer on its inner side, including an outer panel, insulation filler and inner lining plate; the inner lining plate is provided with a mounting hole, through which a support column is passed, one end of the support column is connected to the outer panel, and the other end of the support column is installed on the inner lining plate through a support gasket; insulation filler is filled between the outer panel and the inner lining plate;

[0007] The small-diameter heat exchange element is arranged vertically in the cavity of the boiler body and includes a tubular body and spiral fins. The spiral fins are coiled around the periphery of the tubular body. The diameter of the tubular body is 1 / 2 of the diameter of the spiral fins.

[0008] This technical solution achieves improved insulation and heat exchange efficiency of the boiler through the boiler body, its inner insulation layer, and small-diameter heat exchange elements. Specifically, the main purpose of the inner insulation layer is to reduce heat loss inside the boiler body and improve thermal efficiency; by filling the insulation filler between the outer panel and the inner lining plate, a continuous insulation barrier is formed; the insulation filler has a low thermal conductivity coefficient and can effectively block the transfer of heat through the boiler wall to the outside; at the same time, the setting of the support columns and support gaskets not only ensures the stability of the boiler structure, but also avoids direct compression of the insulation filler, thereby ensuring the insulation effect. The main purpose of the small-diameter heat exchange element is to increase the heat exchange area and improve the heat exchange efficiency within the limited boiler space; the small diameter allows more heat exchange elements to be arranged within the same boiler volume, thereby increasing the heat exchange area; at the same time, the coiled setting of the spiral fins increases the surface area of ​​the heat exchange element and improves the heat exchange efficiency with the flue gas or medium; because the diameter of the tubular body is 1 / 2 of the diameter of the spiral fin, while maintaining a small diameter, it also ensures that the spiral fins have enough space for heat exchange, thereby achieving efficient heat recovery.

[0009] In addition, the small-diameter waste heat boiler with an inner insulation layer proposed in the present invention also has the following additional technical features:

[0010] According to an embodiment of the present invention, reinforcing ribs are further provided between the outer panel and the inner lining panel, and the reinforcing ribs are located between adjacent supporting columns.

[0011] This technical solution is used to enhance the structural strength of the boiler by adding reinforcing ribs between the outer panel and the inner lining plate of the boiler body.

[0012] According to one embodiment of the present invention, the inner lining plate is a high temperature resistant steel plate.

[0013] This technical solution utilizes high-temperature-resistant steel for the inner lining, allowing for free thermal expansion and protecting the insulation layer. The internal pressure of the outer panels is 1.5 times the maximum back pressure of the turbine, or 508 mm of water column. Vertical thermal expansion of the outer panels and steel frame is unimpeded, while horizontal expansion is mitigated by expansion joints at the turbine outlet and chimney inlet.

[0014] According to one embodiment of the present invention, the thermal insulation filler is composed of at least two layers of ceramic wool covered in an alternating manner.

[0015] This technical solution reduces the thermal expansion of the steel structure and the airtight shell to a minimum by using at least two layers of ceramic wool as a thermal insulation filler.

[0016] According to an embodiment of the present invention, the boiler body is connected to the bottom steel frame through a bellows.

[0017] This technical solution uses a bellows in the connection between the boiler body and the bottom steel frame to adapt to the rapid start-up of the unit and the high flow rate and turbulence of the flue gas discharged by the combustion engine.

[0018] According to an embodiment of the present invention, the diameter of the small-diameter heat exchange element determines the footprint of the boiler body.

[0019] This technical solution uses small-diameter heat exchange elements to reduce the weight of the boiler and reduce the boiler's footprint. Taking into account the deflection problem of small-diameter heat exchange tubes, the small-diameter heat exchange elements are arranged vertically in the flue.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] By using small-diameter heat exchange elements, more heat exchange elements can be arranged within the same boiler volume, thereby increasing the heat exchange area; by using at least two layers of ceramic wool as a staggered insulation filler, the thermal expansion of the steel structure and the airtight casing is reduced to a minimum; the use of bellows as a connection between the boiler body and the bottom steel frame is used to adapt to the rapid start-up of the unit and the high flow rate and turbulence of the flue gas emitted by the gas turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the entire utility model.

[0023] Figure 2 This is the assembly drawing of the inner insulation layer.

[0024] Figure 3 It is a cross-sectional view of the inner insulation layer.

[0025] Figure 4 This is the main view of the heat exchange element.

[0026] Figure 5 It is a three-dimensional diagram of the heat exchange element.

[0027] In the figure: 1. Boiler body; 11. Outer panel; 12. Insulation filler; 13. Inner lining; 14. Support column; 15. Support pad; 2. Small-diameter heat exchange element; 3. Spiral fin. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1

[0030] like Figures 1 to 5 As shown, this embodiment provides a small-diameter waste heat boiler with an inner insulation layer, including a boiler body 1, and the boiler body 1 has a plurality of small-diameter heat exchange elements 2 built therein, wherein:

[0031] The boiler body 1 has an inner insulation layer provided on its inner side, including an outer panel 11, an insulation filler 12, and an inner lining plate 13. The inner lining plate 13 has a mounting hole, through which a support column 14 passes. One end of the support column 14 is connected to the outer panel 11, and the other end of the support column 14 is mounted on the inner lining plate 13 via a support gasket. The insulation filler 12 is filled between the outer panel 11 and the inner lining plate 13.

[0032] The small-diameter heat exchange element 2 is vertically arranged in the cavity of the boiler body 1 and includes a tubular body and spiral fins 3. The spiral fins 3 are coiled around the periphery of the tubular body. The diameter of the tubular body is 1 / 2 of the diameter of the spiral fins 3.

[0033] like Figures 1 to 5 As shown, this technical solution achieves improved insulation and heat exchange efficiency of the boiler through the boiler body 1 and its inner insulation layer and small-diameter heat exchange elements 2. Specifically, the main purpose of the inner insulation layer is to reduce heat loss inside the boiler body 1 and improve thermal efficiency; by filling the insulation filler 12 between the outer panel 11 and the inner lining plate 13, a continuous insulation barrier is formed; the insulation filler 12 has a low thermal conductivity coefficient and can effectively block the transfer of heat through the boiler wall to the outside world; at the same time, the provision of support columns 14 and support gaskets not only ensures the stability of the boiler structure, but also avoids direct compression of the insulation filler 12, thereby ensuring the insulation effect. The main purpose of the small-diameter heat exchange element 2 is to increase the heat exchange area and improve the heat exchange efficiency within the limited boiler space; the small diameter allows more heat exchange elements to be arranged within the same boiler volume, thereby increasing the heat exchange area; at the same time, the coiled arrangement of the spiral fins 3 increases the surface area of ​​the heat exchange element and improves the heat exchange efficiency with the flue gas or medium; because the diameter of the tubular body is 1 / 2 of the diameter of the spiral fins 3, while maintaining a small diameter, it also ensures that the spiral fins 3 have sufficient space for heat exchange, thereby achieving efficient heat recovery.

[0034] In addition, the small-diameter waste heat boiler with an inner insulation layer proposed in the present invention also has the following additional technical features:

[0035] According to an embodiment of the present invention, reinforcing ribs are further provided between the outer panel 11 and the inner lining panel 13 , and the reinforcing ribs are located between adjacent supporting columns 14 .

[0036] This technical solution is used to enhance the structural strength of the boiler by adding reinforcing ribs between the outer panel 11 and the inner lining plate 13 of the boiler body 1.

[0037] According to an embodiment of the present invention, the inner lining plate 13 is a high temperature resistant steel plate.

[0038] This technical solution utilizes high-temperature-resistant steel for the inner lining 13, allowing for free thermal expansion and protecting the insulation layer. The internal pressure of the outer panel 11 is 1.5 times the maximum back pressure of the turbine, or 508 mm of water column. Thermal expansion of the outer panel 11 and the steel frame is unimpeded vertically, while horizontal expansion is mitigated by expansion joints at the turbine outlet and chimney inlet.

[0039] According to an embodiment of the present invention, the thermal insulation filler 12 is composed of at least two layers of ceramic wool covered in an alternating manner.

[0040] This technical solution reduces the thermal expansion of the steel structure and the airtight shell to a minimum by using at least two layers of ceramic wool as the thermal insulation filler 12 in an alternating manner.

[0041] According to an embodiment of the present invention, the boiler body 1 is connected to the bottom steel frame via a bellows.

[0042] This technical solution uses a bellows in the connection between the boiler body 1 and the bottom steel frame to adapt to the rapid start-up of the unit and the high flow rate and turbulence of the flue gas discharged by the combustion engine.

[0043] According to an embodiment of the present invention, the diameter of the small-diameter heat exchange element 2 determines the floor space occupied by the boiler body 1 .

[0044] This technical solution adopts small-diameter heat exchange elements 2 to reduce the weight of the boiler and reduce the boiler footprint. Considering the deflection problem of small-diameter heat exchange tubes, the small-diameter heat exchange elements 2 are arranged vertically in the flue.

[0045] The usage process of the above embodiment is as follows:

[0046] like Figures 1 to 5 As shown, the boiler body 1 is provided with an inner insulation layer, which is filled with insulation filler 12 to form an insulation barrier, effectively reducing heat loss; the support columns 14 and support gaskets ensure the stability of the boiler structure and prevent the insulation filler 12 from being compressed; the small-diameter heat exchange element 2 is arranged vertically in the boiler cavity, and its tubular body and spiral fin 3 design increase the heat exchange area and improve the heat exchange efficiency;

[0047] During operation, flue gas or medium flows through the small-diameter heat exchange element 2, exchanging heat with the tubular body through the spiral fins 3 to achieve heat recovery. The inner lining plate 13 is made of high-temperature resistant steel plate, which can freely expand due to heat and protect the insulation layer. The setting of reinforcing ribs enhances the structural strength of the boiler. The boiler body 1 is connected to the bottom steel frame through a corrugated tube to accommodate the rapid start-up of the unit and the high flow rate and turbulence of the flue gas. The diameter of the small-diameter heat exchange element 2 determines the boiler's footprint. The small-diameter design can reduce the boiler's weight and reduce the footprint. In summary, the boiler body 1 achieves efficient insulation and heat exchange through the synergistic effect of the inner insulation layer and the small-diameter heat exchange element 2.

[0048] Although the present invention has been described in detail with reference to the accompanying drawings and in conjunction with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall fall within the scope of the present invention. Any changes or substitutions that can be easily conceived by a person of ordinary skill in the art within the technical scope disclosed in the present invention shall fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection of the claims.

Claims

1. A small-diameter waste heat boiler with an inner insulation layer, characterized in that: The boiler body (1) includes a plurality of small-diameter heat exchange elements (2) built into the boiler body (1), wherein: A boiler body (1) is provided with an inner insulation layer on its inner side, comprising an outer panel (11), an insulation filler (12) and an inner lining plate (13); a mounting hole is provided on the inner lining plate (13), a support column (14) passes through the mounting hole, one end of the support column (14) is connected to the outer panel (11), and the other end of the support column (14) is installed on the inner lining plate (13) through a support gasket; insulation filler (12) is filled between the outer panel (11) and the inner lining plate (13); A small-diameter heat exchange element (2) is vertically arranged in the cavity of the boiler body (1), comprising a tubular body and spiral fins (3), wherein the spiral fins (3) are coiled around the periphery of the tubular body; the diameter of the tubular body is 1 / 2 of the diameter of the spiral fins (3).

2. The small-diameter waste heat boiler with an inner insulation layer according to claim 1, characterized in that: Reinforcing ribs are also provided between the outer panel (11) and the inner lining plate (13), and the reinforcing ribs are located between adjacent supporting columns (14).

3. The small-diameter waste heat boiler with an inner insulation layer according to claim 1, characterized in that: The inner lining plate (13) is a high temperature resistant steel plate.

4. The small-diameter waste heat boiler with an inner insulation layer according to claim 1, characterized in that: The thermal insulation filler (12) is composed of at least two layers of ceramic wool covered in an alternating manner.

5. The small-diameter waste heat boiler with an inner insulation layer according to claim 1, characterized in that: The boiler body (1) is connected to the bottom steel frame via a bellows.

6. The small-diameter waste heat boiler with an inner insulation layer according to claim 1, characterized in that: The diameter of the small-diameter heat exchange element (2) determines the floor space occupied by the boiler body (1).

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