A heavy naphthalene anti-coking tubular heating device

Abstract

This invention discloses a tubular heating device for preventing coking of phenylene naphthalene, relating to the field of tubular furnace technology. It includes a furnace body, a waste heat recovery device, an air supply system, and a flue gas exhaust system. The furnace body comprises a radiant chamber and a convection chamber. Radiant furnace tubes are arranged vertically in a circumferential pattern within the radiant chamber, and convection furnace tubes are arranged in the convection chamber. A central burner is vertically mounted at the center of the bottom of the radiant chamber via a bracket. Several side burners are arranged circumferentially around the central burner on the upper surface of the bottom of the radiant chamber. A flame distribution sleeve is fitted over the central burner, with the upper end of the sleeve being an upward-opening trumpet shape and densely covered with distribution holes. This invention uses the central burner to compensate for insufficient heating of the upper radiant furnace tubes by the lower side burners. This results in a more uniform heat distribution within the radiant chamber, thereby avoiding localized overheating and reducing coking problems caused by localized heating of the radiant furnace tubes.

Description

Technical Field

[0001] This invention belongs to the technical field of tubular heating furnaces, and in particular relates to a tubular heating device for preventing coking of heavy phenyl naphthalene. Background Technology

[0002] Coal tar processing separates components such as light oil, phenolic oil, naphthalene oil, wash oil, anthracene oil, and pitch through distillation. In the production and processing of phenylene naphthalene, tubular heating furnaces, as industrial heating furnaces, are widely used in petroleum refining, petrochemicals, coal chemicals, tar processing, and crude oil transportation. These furnaces mainly consist of a radiant chamber using burner radiation heating and a convection chamber using high-temperature flue gas from the burner for convection heating. However, a common problem with current tubular heating furnaces is coking in the furnace tubes, which significantly impacts the overall lifespan of the equipment and the quality of the product. The reasons for coking in the furnace tubes include: unstable raw material tar properties, making it prone to coking at high temperatures; high water content in the tar, resulting in poor dehydration; and uneven heat distribution within the furnace, causing localized overheating of the furnace tubes and leading to coking. Therefore, to solve this problem, a heating device is urgently needed to address the coking issue that occurs during the production and processing of phenylene naphthalene. Summary of the Invention

[0003] The purpose of this invention is to provide a tubular heating device for preventing coking of phenyl naphthalene. By setting a central burner in the radiation chamber and a flame distribution sleeve for distributing heat, the problem of coking easily caused by uneven heating during the production and processing of phenyl naphthalene in the prior art is solved.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0005] This invention relates to a cyclohexane-naphthalene anti-coking tube heating device, comprising a heating furnace body, a waste heat recovery device, an air supply system, and a flue gas exhaust system. The heating furnace body includes a radiant chamber and a convection chamber. Radiant furnace tubes are arranged vertically along the circumference of the radiant chamber, and convection furnace tubes are arranged in the convection chamber. A central burner is vertically mounted on a support at the bottom center of the radiant chamber. Several side burners are arranged circumferentially around the central burner on the upper surface of the bottom of the radiant chamber. A flame diversion sleeve is fitted over the central burner. The upper end of the flame diversion sleeve is an upward-opening trumpet shape, and the flame diversion sleeve is densely covered with diversion holes.

[0006] As a preferred embodiment of the present invention, the bottom side of the heating furnace body is provided with an inspection port, and the bottom of the heating furnace body is welded with support legs.

[0007] As a preferred embodiment of the present invention, the radiation chamber comprises, from the outside to the inside, a shell and a furnace, wherein the central burner and the side burners are both located inside the furnace, and the inner walls of the radiation chamber and the convection chamber are lined with high-temperature resistant linings.

[0008] As a preferred embodiment of the present invention, both the central burner and the side burners are circular flame burners.

[0009] As a preferred embodiment of the present invention, the top of the convection chamber is connected to a convection chimney, and a flue gas emission pipe communicating with the interior of the convection chimney is provided on one side of the convection chimney.

[0010] As a preferred embodiment of the present invention, the convection furnace tube outlet and the radiant furnace tube inlet are connected in series via a turnaround bend.

[0011] As a preferred embodiment of the present invention, the radiant furnace tube is provided with a heat insulation sleeve for blocking flame radiation at the end of the radiant furnace tube at the outlet position in the radiant chamber.

[0012] As a preferred embodiment of the present invention, the central burner is installed in the radiant chamber at a height not less than half the height of the radiant chamber.

[0013] As a preferred embodiment of the present invention, the inlet of the convection furnace tube is connected to a coking tee for air-steam coking.

[0014] As a preferred embodiment of the present invention, there are four side burners, and the included angle between the side burners is 90 degrees.

[0015] The present invention has the following beneficial effects:

[0016] This invention utilizes a central burner mounted on a bracket in the center of the radiant chamber. The central burner distributes heat through a flame distribution sleeve. The side burners, being closer to the lower end of the radiant furnace tubes within the chamber, receive more heat. Conversely, the upper end of the radiant furnace tubes, being farther from the side burners, receives less heat. The central burner primarily heats the upper end of the radiant furnace tubes. The trumpet-shaped flame distribution sleeve ensures that heat reaches the radiant furnace tubes progressively upwards from the center, resulting in a greater amount of heat received. This compensates for insufficient heat supply to the upper radiant furnace tubes from the lower side burners. This more even heat distribution within the radiant chamber prevents localized overheating and reduces coking problems caused by localized heating of the radiant furnace tubes.

[0017] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a cross-sectional view of the convection chamber in this invention;

[0021] Figure 3 This is a cross-sectional view of the radiation chamber in this invention;

[0022] Figure 4 This is a schematic diagram of the internal structure of the radiation chamber in this invention;

[0023] Figure 5 This is a three-dimensional structural diagram of the central burner in this invention;

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1-Radiation chamber, 2-Liner, 3-Radiation furnace tube, 4-Convection chamber, 5-Convection furnace tube, 6-Convection chimney, 7-Convection tube inlet, 8-Side burner, 9-Central burner, 10-Flame diversion sleeve, 101-Sleeve body, 102-Diversion hole, 103-Fixed flange, 11-Feet, 12-Bracket. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0028] like Figure 1-5As shown: This invention provides a cyclohexane-naphthalene anti-coking tube heating device, including a heating furnace body, a waste heat recovery device, an air supply system, and a flue gas exhaust system. The bottom side of the heating furnace body is provided with an inspection port, and the bottom of the heating furnace body is welded with support legs. The heating furnace body includes a radiation chamber 1 and a convection chamber 4. Radiant furnace tubes 3 are arranged vertically along the circumference in the radiation chamber 1, and convection furnace tubes 5 are provided in the convection chamber 4. The invention is characterized in that: a central burner 9 is vertically installed at the bottom center of the radiation chamber 1 via a bracket 12, and several side burners 8 are arranged around the central burner 9 on the upper surface of the bottom of the radiation chamber 1. A flame diversion sleeve 10 is fitted on the upper part of the central burner 9. The upper end of the flame diversion sleeve 10 is an upward-opening trumpet shape, and the flame diversion sleeve 10 is densely covered with diversion holes 102.

[0029] In this invention, a central burner 9 is installed in the middle of the radiant chamber 1 using a bracket. The central burner 9 distributes heat through a flame distribution sleeve 10. The side burners 8 are closer to the lower end of the radiant furnace tube 3 inside the radiant chamber and receive more heat. Conversely, the upper end of the radiant furnace tube 3 is farther from the side burners and receives less heat. The central burner 9 is mainly used to heat the upper end of the radiant furnace tube 3. The trumpet-shaped flame distribution sleeve 10 allows heat to get closer to the radiant furnace tube from the center upwards, resulting in more heat being received. This compensates for the insufficient heat supply to the upper radiant furnace tube 3 by the lower side burners 8. This makes the heat distribution in the radiant chamber 1 more uniform, thereby avoiding local overheating and reducing the coking problem caused by localized heating of the radiant furnace tube 3.

[0030] like Figure 1-3 As shown: The radiant chamber 1 includes a shell and a furnace chamber. The central burner 9 and side burners 8 are both located inside the furnace chamber. High-temperature resistant linings 2 are laid on the inner walls of both the radiant chamber 1 and the convection chamber 4. Both the central burner 9 and the side burners 8 are circular flame burners. The top of the convection chamber 4 is connected to a convection chimney 6, and a flue gas exhaust pipe communicating with the interior of the convection chimney 6 is installed on one side of the chimney. The outlet of the convection furnace tube 5 is connected in series with the inlet of the radiant furnace tube 3 via a bend.

[0031] In this embodiment, the high-temperature resistant lining 2 serves to protect the inner wall and shell. The specific material of the high-temperature resistant lining 2 can be found in existing technology and will not be described further here. The flue gas generated by the burner combustion passes through the radiant chamber 1 to the convection chamber 4 and is finally discharged via the convection chimney 6 and the flue gas exhaust pipe. The flue gas exhaust pipe can be connected to an external waste heat recovery device and a waste gas treatment device, which helps to save energy, reduce emissions, and protect the environment. The outlet of the convection furnace tube 5 and the inlet of the radiant furnace tube 3 are connected in series via a bend. Bis(phenylene naphthalene) enters the furnace tube from the convection furnace tube inlet 7 and then flows out from the radiant furnace tube 3. This forms a single piping system. Compared to the current practice of multiple parallel pipelines in production, the single piping system makes it easier to control the flow rate and velocity of the medium, which can help reduce coking.

[0032] In another optional embodiment: the radiant furnace tube 3, located at its outlet position within the radiant chamber 1, is fitted with a heat-insulating sleeve to block flame radiation. The outlet position of the radiant furnace tube 3 is typically located at the lower end of the radiant chamber 1, closer to the side combustion chamber. However, studies have shown that the downward furnace tubes located at the radiant section outlet exhibit severe coking. The heat-insulating sleeve can relatively reduce the possibility of localized overheating caused by the burner flame extinguishing the radiant furnace tube 3, thereby reducing the coking rate.

[0033] like Figure 4-5 As shown: The central burner 9 is installed inside the radiation chamber 1 at a height no less than half the height of the radiation chamber 1. A coking tee for air-steam coking is connected to the outside of the convection furnace tube inlet 7. There are four side burners 8 in total, with an included angle of 90 degrees between them.

[0034] In this embodiment, the height of the central burner 9 and the layout of the side burners 8 can be adjusted according to the actual needs of production. In this embodiment, the central burner 9 is located at the upper middle part of the radiant chamber 1 to better compensate for the heat of the upper middle radiant furnace tube 3 and to avoid excessive interference with the lower side burners 8. The side burners are distributed around the central burner 9, which makes the heating more uniform. The principle of the steam-air coking method: By appropriately controlling the furnace temperature of the tubular furnace and the amount of air and steam introduced into the furnace tubes, the coke inside the furnace tubes is slowly burned. The combustion products and unburned coke powder are carried out of the furnace tubes by the airflow and thus removed. After coking, the tar flow rate increases, and the outlet pressure of the second-stage tar pump decreases. Compared with manual mechanical coking methods, not only is the coke thoroughly removed, but time and manpower are also saved.

[0035] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., 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 invention. In this specification, 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.

[0036] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A styrene-naphthalene anti-coking tube heating device, comprising a heating furnace body, a waste heat recovery device, an air supply system, and a flue gas exhaust system, wherein the heating furnace body comprises a radiant chamber (1) and a convection chamber (4), wherein vertically arranged radiant furnace tubes (3) are disposed in the radiant chamber (1) along the circumference, and convection furnace tubes (5) are disposed in the convection chamber (4), characterized in that: A central burner (9) is vertically installed at the bottom center of the radiation chamber (1) via a bracket (12). Several side burners (8) are arranged around the central burner (9) on the upper surface of the bottom of the radiation chamber (1). A flame diversion sleeve (10) is fitted above the central burner (9). The upper end of the flame diversion sleeve (10) is a funnel shape with an upward opening. Diversion holes (102) are densely distributed on the sleeve of the flame diversion sleeve (10). The central burner (9) is installed in the radiation chamber (1) at a height not less than half the height of the radiation chamber (1); the central burner (9) distributes heat through the flame distribution sleeve (10), and the trumpet-shaped flame distribution sleeve (10) makes the heat from the center upwards get closer and closer to the radiation furnace tube.

2. The anti-coking tubular heating device for heavy phenyl naphthalene according to claim 1, characterized in that, The bottom side of the heating furnace body is provided with an inspection port, and the bottom of the heating furnace body is welded with support legs.

3. The anti-coking tubular heating device for phenylene naphthalene according to claim 1, characterized in that, The radiation chamber (1) includes a shell and a furnace. The central burner (9) and the side burners (8) are both located inside the furnace. The inner walls of the radiation chamber (1) and the convection chamber (4) are lined with high-temperature resistant linings (2).

4. The anti-coking tubular heating device for phenylene naphthalene according to claim 1, characterized in that, Both the central burner (9) and the side burners (8) are circular flame burners.

5. The anti-coking tubular heating device for phenylene naphthalene according to claim 1, characterized in that, The top of the convection chamber (4) is connected to the convection chimney (6), and a flue gas emission pipe connected to the interior of the convection chimney (6) is provided on one side of the convection chimney (6).

6. The anti-coking tubular heating device for phenylene naphthalene according to claim 1, characterized in that, The outlet of the convection furnace tube (5) and the inlet of the radiant furnace tube (3) are connected in series via a turnaround bend.

7. The anti-coking tubular heating device for phenylene naphthalene according to claim 1, characterized in that, The radiant furnace tube (3) is located at the outlet position inside the radiant chamber (1) and is fitted with a heat insulation sleeve to block flame radiation.

8. The anti-coking tubular heating device for phenylene naphthalene according to claim 1, characterized in that, The convection furnace tube inlet (7) is connected to a coking tee for air-steam coking.

9. The anti-coking tubular heating device for phenylene naphthalene according to claim 1, characterized in that, There are four side burners (8).

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