Double n-type compact heating furnace

Abstract

This utility model discloses a double-n-type compact heating furnace, belonging to the field of heating furnace technology. It includes a vertically arranged radiant section and a convection section, as well as a horizontally arranged transition section. The radiant section houses a radiant furnace tube assembly. A burner for heating the radiant furnace tube assembly is located at the bottom of the radiant section. The radiant section and the convection section are connected through the transition section to form an n-type heating furnace. The double-n-type compact heating furnace provided by this utility model, with its radiant and convection sections forming an n-type structure, not only makes the overall structure compact and eliminates the need for a complex flue at the bottom of the radiant section, but also overcomes the drawbacks of traditional top-mounted convection section furnaces being too tall and requiring extensive steel structure support, and traditional bottom-mounted convection section furnaces occupying too much space, through mutual support between the two. Simultaneously, the n-type radiant furnace tubes in the radiant section allow the process medium to flow in several n-shaped patterns within the furnace, ensuring residence time while fully utilizing the tube space and significantly improving heating efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heating furnace technology, specifically to a double n-type compact heating furnace. Background Technology

[0002] In petroleum and chemical production plants, heating furnaces are the core equipment for raising the temperature of process media, and their performance directly affects production efficiency and cost control. Currently, traditional heating furnaces have evolved into various types to adapt to different process requirements; however, each type has certain limitations.

[0003] Taking traditional cylindrical heaters as an example, their cylindrical structure design offers an inherent advantage in terms of space utilization, requiring a small footprint and making them suitable for installations in environments with limited space. However, due to limitations in furnace space and burner layout, traditional cylindrical heaters have significant shortcomings in their heat load supply capacity. When processing high-energy-consuming processes such as heavy oil cracking and aromatics reforming, traditional cylindrical heaters often struggle to provide a stable, continuous, and sufficient heat output, resulting in low efficiency in heating the process medium. This often necessitates the parallel operation of multiple units, increasing both investment costs and operational maintenance complexity.

[0004] While top-fired square box furnaces, with their burners arranged at the top, can provide a large heat load output and meet the needs of some high-heat processing processes, this type of furnace has a serious flaw in its flue gas emission design. The flue gas can only exit from the bottom side. To achieve effective flue gas collection and emission, the bottom flue must be designed with complex flue wall and top structures, and the convection section length must also be increased. This not only significantly increases the footprint of the top-fired square box furnace, placing higher demands on the installation site and severely limiting its application scenarios, but also increases the difficulty of equipment manufacturing and construction, significantly increasing investment costs.

[0005] In summary, existing traditional heating furnace designs struggle to achieve a good balance in terms of heat load supply, equipment structural complexity, floor space, and investment costs, failing to fully meet the demands of efficient and economical operation in petroleum and chemical plants. Therefore, a new type of heating furnace structure is urgently needed, combining high heat load, compact layout, low investment cost, and high operational flexibility. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a double-n-type compact heating furnace, aiming to solve the problem that existing heating furnaces cannot simultaneously achieve high heat load and compact layout. To achieve the above objective, this utility model provides the following technical solution:

[0007] A double n-type compact heating furnace includes a vertically arranged radiant section and a convection section, and a horizontally arranged transition section; the radiant section is provided with a radiant furnace tube assembly for supplying heat to the process medium to be heated; the bottom of the radiant section is provided with a burner for supplying heat to the radiant furnace tube assembly; the radiant section and the convection section are connected through the transition section to form an n-type heating furnace.

[0008] Furthermore, the radiant furnace tube assembly has an input connector and an output connector; a radiant furnace tube group is connected between the input connector and the output connector; the radiant furnace tube group includes several parallel radiant furnace tubes; the several radiant furnace tubes are connected in series; adjacent radiant furnace tubes are connected by a first elbow.

[0009] Furthermore, the radiant furnace tube includes two vertically arranged furnace tubes, which are connected by a second elbow to form an n-shaped radiant furnace tube.

[0010] Furthermore, the burner has a vertical burner nozzle, and the flue gas from the burner sweeps across the radiant furnace tube assembly from bottom to top.

[0011] Furthermore, a superheated combustion chamber is provided within the transition section; a horizontal supplementary heating burner is provided on the superheated combustion chamber.

[0012] Furthermore, an induced draft fan is provided at the bottom of the convection section.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model provides a double n-type compact heating furnace, in which the radiant section and the convection section form an n-type structure. The structure is very compact, and the bottom of the radiant section does not need to be equipped with a complex flue. Moreover, the radiant section and the convection section form an n-type structure and support each other, which avoids the disadvantages of traditional top-mounted convection section furnaces that are too tall and require a lot of steel structure support, and also avoids the problem of traditional bottom-mounted convection section furnaces that occupy too much area. It achieves both economy and convenience.

[0015] 2. The present invention provides a double n-type compact heating furnace, which, by setting n-type radiant furnace tubes in the radiant section, allows the process medium to enter from one side of the furnace tube and exit from the other side. Through the ingenious combination of the first bend and the second bend, the process medium undergoes several n-type flows in the furnace, ensuring the residence time in the furnace, making full use of the tube layout space in the furnace, and improving the heating efficiency.

[0016] 3. The present invention provides a double n-type compact heating furnace, which greatly improves the operational flexibility and adaptability of heating by setting a horizontal supplementary heating burner in the horizontal transition section. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of a double n-type compact heating furnace provided by this utility model;

[0018] Figure 2 This is a first-view schematic diagram of the radiant furnace tube assembly provided by this utility model;

[0019] Figure 3 This is a second-view schematic diagram of the radiant furnace tube assembly provided by this utility model;

[0020] Figure 4 This is a schematic diagram of the overall structure of the radiant furnace tube assembly provided by this utility model;

[0021] The attached diagram is labeled as follows: 1. Radiant section; 2. Convection section; 3. Transition section; 4. Radiant furnace tube assembly; 5. Burner; 6. First bend; 7. Vertical furnace tube; 8. Second bend; 9. Horizontal supplementary heat burner. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0025] In the description of this utility model, "multiple" means two or more.

[0026] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0027] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] Example 1

[0030] See attached Figures 1-4 This embodiment provides a dual-n type compact heating furnace, such as... Figure 1 As shown, the furnace includes a vertically arranged radiant section 1 and a convection section 2, and a horizontally arranged transition section 3. The tops of the radiant section 1 and the tops of the convection section 2 are connected by the transition section 3 to form an n-shaped structure. The radiant section 1 houses a radiant furnace tube assembly 4, which has an inlet pipe and an outlet pipe. The radiant furnace tube assembly 4 also has channels for the flow of process media, which can flow in through the inlet pipe, through the channels in the radiant furnace tube assembly 4, and out through the outlet pipe. A burner 5 is located at the bottom of the radiant section 1, which can be used to heat the radiant furnace tube assembly 4. When the furnace is operating, the flue gas from the burner 5 sweeps across the radiant furnace tube assembly 4 and undergoes sufficient heat exchange before flowing out of the radiant section 1, passing through the transition section 3, and then exiting the furnace from the outlet of the convection section 2. The burner 5 can be implemented using existing technology.

[0031] The n-shaped structure formed by the radiation section 1 and the convection section 2 supports each other and is compact. It avoids the disadvantages of the traditional top-mounted convection section 2 furnace type being too tall and requiring a large amount of steel structure support, as well as the problem of the traditional bottom-mounted convection section 2 furnace type having too large a footprint.

[0032] Example 2

[0033] See attached Figures 1-4 In one specific embodiment of this application, the specific structure of the radiant furnace tube assembly is as follows:

[0034] The radiant furnace tube assembly comprises several parallel radiant furnace tubes connected in series, with adjacent tubes connected by a first elbow 6. For example... Figure 2 , Figure 3 and Figure 4As shown, the radiant furnace tube includes two vertically arranged furnace tubes 7, which are connected by a second elbow 8 to form an n-shaped radiant furnace tube. The flow path of the process medium is as follows: after flowing in from the input pipe, it first undergoes a large n-shaped flow, that is, it passes through one vertical furnace tube 7 in sequence, and then flows through the second elbow 8 to the other vertical furnace tube 7 arranged opposite to it; then it undergoes a small n-shaped flow, that is, it flows through the first elbow 6 into the next radiant furnace tube; the above path is repeated continuously to form a continuous serpentine flow path until the process medium flows out from the output pipe.

[0035] This utility model provides a double n-type compact heating furnace. By setting n-type radiant furnace tubes in the radiant section 1, the process medium enters from one side of the radiant furnace tube and exits from the other side. Through the ingenious combination of the first bend 6 and the second bend 8, the process medium undergoes several n-type flows in the furnace, ensuring the residence time in the furnace, making full use of the tube layout space in the furnace, and improving the heating efficiency.

[0036] In one specific embodiment of this application, the burner 5 has a vertical burner. The flue gas from the burner 5 sweeps over the radiant furnace tube assembly 4 from bottom to top, passes through the transition section 3 at the top of the radiant section 1, then turns around and flows from top to bottom through the convection section 2 to recover heat, and is discharged from the bottom of the convection section 2. The flue gas completes an n-shaped flow.

[0037] In one specific embodiment of this application, a superheated combustion chamber is provided in the transition section 3, and a horizontal supplementary heating burner 9 is provided on the superheated combustion chamber. An induced draft fan is provided at the bottom of the convection section 2. The high-temperature flue gas generated by the combustion of the burner 5 flows from bottom to top in the radiant section 1 of the self-heating furnace, heats the n-shaped radiant furnace tubes in the radiant section 1, and then passes through the transition section 3 at the top of the radiant section 1. The horizontal supplementary heating burner 9 provided in the combustion chamber of the top transition section 3 of the heating furnace reheats the flue gas, and then turns around and flows from top to bottom through the convection section 2 to recover heat. The flue gas is discharged into the induced draft fan from the bottom of the convection section 2, and the flue gas completes an n-shaped flow.

[0038] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.

Claims

1. A double-n type compact heating furnace, characterized in that: It includes a vertically arranged radiant section (1) and a convection section (2), and a horizontally arranged transition section (3); the radiant section (1) is provided with a radiant furnace tube assembly (4) for the process medium to be heated to pass through; the bottom of the radiant section (1) is provided with a burner (5) for heating the radiant furnace tube assembly (4); the radiant section (1) and the convection section (2) are connected through the transition section (3) to form an n-type heating furnace.

2. The double n-type compact heating furnace according to claim 1, characterized in that: The radiant furnace tube assembly (4) has an input connector and an output connector; a radiant furnace tube group is connected between the input connector and the output connector; the radiant furnace tube group includes several parallel radiant furnace tubes; the several radiant furnace tubes are connected in series; two adjacent radiant furnace tubes are connected by a first elbow (6).

3. A double-n-type compact heating furnace according to claim 2, characterized in that: The radiant furnace tube includes two vertically arranged furnace tubes (7) that are opposite each other. The two vertical furnace tubes (7) are connected by a second elbow (8) to form an n-shaped radiant furnace tube.

4. A double-n-type compact heating furnace according to claim 1, characterized in that: The burner (5) has a vertical burner, and the flue gas from the burner (5) sweeps over the radiant furnace tube assembly (4) from bottom to top.

5. A double-n-type compact heating furnace according to claim 1, characterized in that: The transition section (3) is provided with a superheated combustion chamber; the superheated combustion chamber is provided with a horizontal supplementary heat burner (9).

6. A double-n-type compact heating furnace according to claim 1, characterized in that: The bottom of the convection section (2) is equipped with an induced draft fan.

Images