Auxiliary boiler for vertical enhanced heat transfer ship

Abstract

The utility model discloses a vertical enhanced heat transfer marine auxiliary boiler, and relates to the field of marine auxiliary boilers. The marine auxiliary boiler solves the problems that an existing marine auxiliary boiler is large in occupied area, high in height and large in weight. An upper boiler barrel and a lower boiler barrel are installed at the upper end and the lower end of a boiler supporting structure respectively, the upper boiler barrel is communicated with the lower boiler barrel through a downcomer vertically arranged on the side portion, a water supply pipe communicated with an inner cavity of the upper boiler barrel is installed on the upper boiler barrel, and a membrane type wall tube bundle is vertically arranged between the upper boiler barrel and the lower boiler barrel to form a boiler hearth. The tube plate is horizontally arranged in the middle inside the membrane wall tube bundle, the enhanced heat transfer evaporator tube bundle is vertically installed on the tube plate, and the upper ends and the lower ends of the enhanced heat transfer evaporator tube bundle and the membrane wall tube bundle are communicated with the upper boiler barrel and the lower boiler barrel respectively. According to the utility model, the height, the occupied area and the weight of the boiler are greatly reduced, the energy consumption and the CO2 emission are reduced, and meanwhile, cabin equipment arrangement is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of marine auxiliary boiler, concretely relates to a vertical type heat transfer reinforced marine auxiliary boiler. BACKGROUND

[0002] Marine auxiliary boiler is a kind of heat energy equipment on ship, mainly used to provide auxiliary power and heat energy for ship. In recent years, with the rapid development of high value-added ship industry, ship cabin equipment tends to be modular, system integration is high, and is arranged compactly, under the condition that the boiler evaporation capacity is same, higher requirement is put forward to the size of boiler.

[0003] Since pipe is the basic element of boiler, improving the heat transfer efficiency of boiler is attributed to the heat transfer enhancement research of fluid with or without phase change inside and outside pipe. The structure shape and surface property of pipe directly affect heat transfer efficiency: finned tube heat transfer efficiency is greater than that of dimple tube, and dimple tube heat transfer efficiency is greater than that of light pipe.

[0004] If all the evaporator tube bundles of traditional marine boiler adopt light pipe, then the land area and weight of boiler will be larger, which does not meet the requirement of ship navigation economy. If all the evaporator tube bundles adopt finned tube, then the fin of finned tube in high-temperature flue gas region exists the risk of deformation, and fin deformation will cause finned tube ash deposition and fouling, increase flue gas resistance and reduce heat transfer efficiency, and the cost of boiler later maintenance is higher.

[0005] At the same time, the burner of traditional vertical marine boiler is usually arranged at the bottom of boiler, and fuel is injected from bottom to top, due to the influence of gravity, the flue gas flow rate is reduced, and heat transfer efficiency is affected. The arrangement of burner bottom will increase the height of boiler, which is limited by cabin deck height, is not conducive to the arrangement of boiler, and is not convenient for daily maintenance and maintenance.

[0006] In summary, the existing marine auxiliary boiler has the problems of large land area, high height and large weight. UTILITY MODEL CONTENT

[0007] The utility model aims at solving the problems of large land area, high height and large weight of the existing marine auxiliary boiler, and further provides a vertical type heat transfer reinforced marine auxiliary boiler.

[0008] The technical scheme of the utility model is:

[0009] The application relates to a vertical reinforced heat transfer auxiliary boiler for ships, which comprises an upper drum (1), a lower drum (2), a membrane wall tube bundle (3), a reinforced heat transfer evaporator tube bundle, a tube plate (6), a downcomer (7), a feedwater pipe (8) and a boiler support structure (11), the upper drum (1) and the lower drum (2) are respectively arranged at the upper and lower ends of the boiler support structure (11), the upper drum (1) is communicated with the lower drum (2) through the vertically arranged downcomer (7) on the side of the upper drum (1), the feedwater pipe (8) penetrating the inner cavity of the upper drum (1) is arranged on the upper drum (1), the membrane wall tube bundle (3) is vertically arranged between the upper drum (1) and the lower drum (2) to form a boiler furnace, the tube plate (6) is horizontally arranged at the middle position of the membrane wall tube bundle (3), the reinforced heat transfer evaporator tube bundle is vertically arranged on the tube plate (6), and the upper and lower ends of the reinforced heat transfer evaporator tube bundle and the membrane wall tube bundle (3) are respectively communicated with the upper drum (1) and the lower drum (2).

[0010] Further, the reinforced heat transfer evaporator tube bundle comprises an evaporator tube bundle I (4), the evaporator tube bundle I (4) is vertically inserted into the tube bundle mounting hole on the tube plate (6), the part above the tube plate (6) of the evaporator tube bundle I (4) adopts a membrane wall structure, and the part below the tube plate (6) of the evaporator tube bundle I (4) adopts a dimple tube form.

[0011] Further, the reinforced heat transfer evaporator tube bundle further comprises an evaporator tube bundle II (5), the evaporator tube bundle II (5) is vertically inserted into the tube bundle mounting hole on the tube plate (6), the part above the tube plate (6) of the evaporator tube bundle II (5) adopts a finned tube structure, and the part below the tube plate (6) of the evaporator tube bundle II (5) adopts a dimple tube form.

[0012] Further, the application further comprises a burner (9), the burner (9) is arranged at the top end of the boiler support structure (11), a fuel inlet and an air inlet are arranged above the burner (9), and an inlet flue is arranged below the burner (9), the lower end of the inlet flue penetrates the upper part of the membrane wall tube bundle (3) and extends into the flue gas inner cavity formed by the membrane wall tube bundle.

[0013] Further, the upper part of the membrane wall tube bundle (3) is provided with an inlet flue mounting through hole, the inlet flue is a straight pipe structure, and the inlet flue is vertically inserted into the inlet flue mounting through hole.

[0014] Further, the application further comprises an outlet flue (10), the lower end of the outlet flue (10) penetrates the upper part of the membrane wall tube bundle (3) and the evaporator tube bundle I (4) in sequence and extends into the flue gas inner cavity formed by the evaporator tube bundle I (4).

[0015] Further, the outlet flue (10) is a straight pipe structure, the upper part of the membrane wall tube bundle (3) and the evaporator tube bundle I (4) are respectively provided with a first outlet flue mounting through hole and a second outlet flue mounting through hole, and the lower end of the outlet flue (10) is vertically inserted into the first outlet flue mounting through hole and the second outlet flue mounting through hole.

[0016] Further, the application further comprises an insulation structure, the insulation structure is wrapped outside the membrane wall tube bundle (3), and the insulation structure is connected to the boiler support structure (11) through a connecting element.

[0017] Compared with the prior art, the present invention has the following effects:

[0018] 1. This vertical, heat-transfer enhanced marine auxiliary boiler divides flue gas into two streams, and the evaporator tube bundle is divided into two heat exchange tubes with different heat transfer enhancement types. The cellular tube evaporator bundle is arranged in the first, high-temperature flue gas stream below the tube sheet, while the finned tube evaporator bundle is located in the second, low-temperature flue gas stream above the tube sheet. This improves overall boiler heat transfer while ensuring safety and stability. Compared with similar boilers, while maintaining the same evaporation capacity and boiler efficiency, the boiler can significantly reduce height, floor space, and weight, making it more adaptable to the requirements of modern ships.

[0019] 2. Compared with similar marine auxiliary boilers, the vertical enhanced heat transfer marine auxiliary boiler described in the utility model can significantly reduce boiler height, floor space and weight, reduce energy consumption and CO2 emissions, and is more conducive to the layout of cabin equipment while maintaining the same evaporation capacity and boiler efficiency.

[0020] 3. The vertical enhanced heat transfer marine auxiliary boiler described in the present invention is usually used in ships with narrow cabin space, compact equipment layout and high boiler evaporation capacity requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Fig. 1 This is a structural diagram of a vertical enhanced heat transfer marine auxiliary boiler described in the utility model;

[0022] Fig. 2 This is a partial enlarged view of the assembly of the evaporator tube bundle I and the tube sheet in a vertical enhanced heat transfer marine auxiliary boiler described in the utility model;

[0023] Fig. 3 This is a partial enlarged view of the assembly of the evaporator tube bundle II and the tube sheet in a vertical enhanced heat transfer marine auxiliary boiler described in the utility model;

[0024] In the figure: 1. Upper boiler drum; 2. Lower boiler drum; 3. Membrane wall tube bundle; 4. Evaporator tube bundle I; 5. Evaporator tube bundle II; 6. Tube sheet; 7. Downcomer; 8. Water feed pipe; 9. Burner; 10. Outlet flue; 11. Boiler support structure. DETAILED DESCRIPTION

[0025] Specific implementation method 1: Combination Figs. 1-3The present embodiment is described. This embodiment is a vertical heat transfer enhanced marine auxiliary boiler, which includes an upper boiler drum 1, a lower boiler drum 2, a membrane wall tube bundle 3, an enhanced heat transfer evaporator tube bundle, a tube sheet 6, a downcomer 7, a water supply pipe 8 and a boiler support structure 11. The upper boiler drum 1 and the lower boiler drum 2 are respectively mounted at the upper and lower ends of the boiler support structure 11. The upper boiler drum 1 is connected to the lower boiler drum 2 through the downcomer 7 arranged vertically on the side. The upper boiler drum 1 is installed with a water supply pipe 8 that passes through the inner cavity of the upper boiler drum. The membrane wall tube bundle 3 is vertically arranged between the upper boiler drum 1 and the lower boiler drum 2 to form a boiler furnace. The tube sheet 6 is horizontally arranged in the middle position inside the membrane wall tube bundle 3. The enhanced heat transfer evaporator tube bundle is vertically mounted on the tube sheet 6. The enhanced heat transfer evaporator tube bundle and the upper and lower ends of the membrane wall tube bundle 3 are respectively connected to the upper boiler drum 1 and the lower boiler drum 2.

[0026] In this embodiment, a tube sheet 6 is provided in the boiler furnace to divide the high-temperature flue gas into two flows: in the first flow, the high-temperature flue gas flushes the evaporator tube bundle I4 and the lower half of the evaporator tube bundle II5; in the second flow, the low-temperature flue gas flushes the evaporator tube bundle I4 and the upper half of the evaporator tube bundle II.

[0027] Specific implementation method 2: Combination Figs. 1-3 This embodiment describes the enhanced heat transfer evaporator tube bundle. It includes evaporator tube bundle I4, which is vertically inserted into the tube bundle mounting holes on tube sheet 6. The portion of evaporator tube bundle I4 above tube sheet 6 utilizes a membrane wall structure, while the portion below tube sheet 6 utilizes t-cell tubes. This arrangement creates a flue gas barrier in the portion above tube sheet 6, while the portion below tube sheet 6 utilizes t-cell tubes. This utilizes wall vortex flow theory to enhance heat exchange capacity. Other components and connections are identical to those in the first embodiment.

[0028] Specific implementation method three: Combination Figs. 1-3 To explain this embodiment, the enhanced heat transfer evaporator tube bundle of this embodiment also includes an evaporator tube bundle II 5, which is vertically inserted into the tube bundle mounting holes on the tube sheet 6. The portion of the evaporator tube bundle II 5 above the tube sheet 6 utilizes a finned tube structure, while the portion below the tube sheet 6 utilizes a t-cell tube structure. This arrangement enhances heat transfer capacity by expanding the heat exchange area of ​​the evaporator tube bundle II 5 above the tube sheet 6. The portion below the tube sheet 6 utilizes a t-cell tube structure, utilizing wall vortex flow theory to enhance heat transfer capacity. Other components and connections are the same as those in Specific Embodiments 1 or 2.

[0029] Specific implementation method four: Combination Figs. 1-3This embodiment describes a burner 9 mounted on top of a boiler support structure 11. A fuel inlet and an air inlet are located above the burner 9, and an inlet flue is located below the burner 9. The lower end of the inlet flue passes through the upper portion of the membrane-walled tube bundle 3 and extends into the flue gas cavity formed by the membrane-walled tube bundle. This arrangement utilizes the high-temperature air at the top of the furnace body, creating a high airflow velocity that effectively brings fuel into the combustion chamber, creating a better combustion space and improving combustion efficiency. This effectively utilizes the boiler's space and saves on boiler floor space. Other components and connections are the same as those in Specific Embodiments 1, 2, or 3.

[0030] Specific implementation method five: Combination Figs. 1-3 This embodiment describes a membrane wall tube bundle 3 having an inlet flue installation hole above it. The inlet flue is a straight pipe structure and is vertically inserted into the inlet flue installation hole. Other components and connections are the same as those in Specific Embodiments 1, 2, 3, or 4.

[0031] Specific implementation method six: combination Figs. 1-3 This embodiment also includes an outlet flue 10. The lower end of the outlet flue 10 sequentially passes through the membrane wall tube bundle 3 and the upper portion of the evaporator tube bundle I 4, extending into the flue gas cavity formed by the evaporator tube bundle I 4. Other components and connections are the same as those in the first, second, third, fourth, or fifth embodiments.

[0032] Specific implementation method seven: combination Figs. 1-3 This embodiment describes the outlet flue 10 as a straight tube structure. The upper portions of the membrane wall tube bundle 3 and the evaporator tube bundle I 4 are respectively provided with a first outlet flue mounting hole and a second outlet flue mounting hole. The lower end of the outlet flue 10 is vertically inserted into the first and second outlet flue mounting holes. The remaining components and connections are the same as those in Embodiments 1, 2, 3, 4, 5, or 6.

[0033] Specific implementation method eight: combination Figs. 1-3 This embodiment also includes a thermal insulation structure wrapped around the outside of the membrane wall tube bundle 3 and connected to the boiler support structure 11 via a connecting element. Other components and connections are the same as those in Embodiments 1, 2, 3, 4, 5, 6, or 7.

[0034] How it works

[0035] Combine Figs. 1-3 Figs. 1-3The working principle of the vertical reinforced heat transfer auxiliary boiler for ship is as follows: working medium side: after the auxiliary boiler is filled with water through the water feeding pipe 8, the working medium forms natural circulation between the upper drum 1 and the lower drum 2 through the membrane wall pipe bundle 3, the evaporator pipe bundle I 4, the evaporator pipe bundle II 5 and the downcomer 7. The water in the upper drum 1 enters the lower drum 2 through the downcomer 7, and the water in the lower drum 2, part of which enters the upper drum 1 through the membrane wall pipe bundle 3, has not been vaporized. Another part of the water in the lower drum 2 gradually changes into steam-water mixture during the process of rising into the upper drum 1 through the evaporator pipe bundle I 4 and the evaporator pipe bundle II 5, and the steam-water mixture is separated after entering the upper drum 1, and the saturated steam generated is supplied to the heat equipment through the steam outlet pipeline, so that the circulation of the working medium side of the auxiliary boiler is completed, and the water feeding is continuously changed into steam for external supply through the reciprocating operation. The flue gas side: the fuel is mixed with air through the burner 9, and changes into high-temperature flue gas after being burned, and the high-temperature flue gas washes the lower half of the evaporator pipe bundle I 4 and the evaporator pipe bundle II 5 in the first process, then washes the upper half of the evaporator pipe bundle I 4 and the evaporator pipe bundle II 5 in the second process, and finally is discharged through the outlet flue 10.

[0036] The above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the utility model embodiments.

Claims

1. A vertical heat transfer enhanced marine auxiliary boiler, characterized by: The invention comprises an upper boiler drum (1), a lower boiler drum (2), a membrane wall tube bundle (3), an enhanced heat transfer evaporator tube bundle, a tube sheet (6), a downcomer (7), a water supply pipe (8) and a boiler support structure (11). The upper boiler drum (1) and the lower boiler drum (2) are respectively installed at the upper and lower ends of the boiler support structure (11). The upper boiler drum (1) is connected to the lower boiler drum (2) through a downcomer (7) arranged vertically on the side. The upper boiler drum (1) is provided with a water supply pipe (8) which is connected to the inner cavity of the upper boiler drum. The membrane wall tube bundle (3) is vertically arranged between the upper boiler drum (1) and the lower boiler drum (2) to form a boiler furnace. The tube sheet (6) is horizontally arranged in the middle position inside the membrane wall tube bundle (3). The enhanced heat transfer evaporator tube bundle is vertically installed on the tube sheet (6). The enhanced heat transfer evaporator tube bundle and the upper and lower ends of the membrane wall tube bundle (3) are respectively connected to the upper boiler drum (1) and the lower boiler drum (2).

2. The vertical heat transfer enhanced marine auxiliary boiler according to claim 1, characterized in that: The enhanced heat transfer evaporator tube bundle includes an evaporator tube bundle I (4), which is vertically inserted into the tube bundle installation hole on the tube plate (6). The part of the evaporator tube bundle I (4) located above the tube plate (6) adopts a membrane wall structure, and the part of the evaporator tube bundle I (4) located below the tube plate (6) adopts a cellular tube form.

3. The vertical heat transfer enhanced marine auxiliary boiler according to claim 2, characterized in that: The enhanced heat transfer evaporator tube bundle also includes an evaporator tube bundle II (5). The evaporator tube bundle II (5) is vertically inserted into the tube bundle installation hole on the tube plate (6). The part of the evaporator tube bundle II (5) located above the tube plate (6) adopts a finned tube structure, and the part of the evaporator tube bundle II (5) located below the tube plate (6) adopts a t-cell tube form.

4. The vertical heat transfer enhanced marine auxiliary boiler according to claim 3, characterized in that: It also includes a burner (9), which is installed on the top of the boiler support structure (11). A fuel inlet and an air inlet are provided above the burner (9), and an inlet flue is provided below the burner (9). The lower end of the inlet flue passes through the upper part of the membrane wall tube bundle (3) and extends into the flue gas cavity formed by the membrane wall tube bundle.

5. The vertical heat transfer enhanced marine auxiliary boiler according to claim 4, characterized in that: An inlet flue installation through hole is provided above the membrane wall tube bundle (3). The inlet flue is a straight pipe structure and is vertically inserted into the inlet flue installation through hole.

6. The vertical heat transfer enhanced marine auxiliary boiler according to claim 5, characterized in that: It also includes an outlet flue (10), the lower end of which passes through the membrane wall tube bundle (3) and the upper part of the evaporator tube bundle I (4) in sequence and extends into the flue gas cavity formed by the evaporator tube bundle I (4).

7. The vertical heat transfer enhanced marine auxiliary boiler according to claim 6, characterized in that: The outlet flue (10) is a straight tube structure. The upper parts of the membrane wall tube bundle (3) and the evaporator tube bundle I (4) are respectively provided with a first outlet flue installation through hole and a second outlet flue installation through hole. The lower end of the outlet flue (10) is vertically inserted into the first outlet flue installation through hole and the second outlet flue installation through hole.

8. The vertical heat transfer enhanced marine auxiliary boiler according to claim 7, characterized in that: It also includes a heat-insulating structure, which is wrapped around the outside of the membrane wall tube bundle (3) and connected to the boiler support structure (11) through a connecting element.

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