Radiation calandria of heating furnace

Abstract

The utility model discloses a heating furnace radiation calandria which comprises horizontal furnace tubes and large elbows connected with the horizontal furnace tubes, the horizontal furnace tubes are arranged in two rows in a staggered mode, the middles of the horizontal furnace tubes are supported by tube frames, the two sides of the horizontal furnace tubes are connected through the large elbows, straight tube sections are arranged on the two sides of the large elbows respectively, the straight tube sections and the large elbows are integrally bent, and no welding seam exists between the straight tube sections and the large elbows. The horizontal furnace tubes and the large elbows are communicated end to end to form a spiral ascending tube system similar to an ellipse, and the bending radius of the large elbows is equal to 0.5 time of the distance between the two horizontal furnace tubes which are arranged in a staggered mode. Pressure drop of a radiant tube system of the heating furnace can be effectively reduced, scouring of medium fixed particles in the tube to the elbow is reduced, and the service life of the furnace tube is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating furnaces for oil refining and chemical industry, and in particular relates to a radiation row pipe for a heating furnace. Background Art

[0002] Conventional refinery heating furnace radiation pipes all adopt a structure of horizontal or vertical furnace tubes plus small elbows. However, due to the small turning radius of the small elbow, it is not suitable for some situations where the pressure drop requirement in the tube is relatively low, or the medium in the tube contains solid particles. In this case, some heating furnace radiation pipes adopt a spring-like spiral pipe structure, but the pipe support structure of this structure is relatively complex and can only be made into a cylindrical furnace. The load of a single furnace cannot be too large, and it is not convenient for a cylindrical furnace to adopt a double-sided radiation structure, which increases the amount of furnace tubes and increases the cost of the heating furnace.

[0003] Chinese patent CN 210014654U discloses a disc spiral tube heating furnace tube, which adopts a spiral winding structure, the projection of a single-layer spiral surface on the horizontal plane is a rectangle, the top corner of the rectangle adopts a smooth transition, the long side and the short side of the rectangle correspond to the long straight tube and the short straight tube respectively, the long straight tube and the short straight tube are transitioned by a 90° elbow, the upper inlet of the furnace tube is the medium inlet, and the lower outlet is the medium outlet. This patent can solve the scouring problem of the furnace tube to a certain extent, and can also reduce the pressure drop of the furnace tube system to a certain extent, but because the transition section of the straight tube still adopts the form of elbow plus straight tube, the degree of scouring resistance is limited, and the number of furnace tube welds is increased. Utility Model Content

[0004] In order to solve the problems of complex structure, poor erosion resistance and large pressure drop of the pipe system in the prior art, the utility model provides a heating furnace radiation pipe.

[0005] The utility model provides a heating furnace radiation row pipe, comprising a horizontal furnace pipe and a large elbow connecting the horizontal furnace pipe, the horizontal furnace pipe is arranged in two rows in a staggered manner, the middle of the horizontal furnace pipe is supported by a pipe rack, and the two sides of the horizontal furnace pipe are connected by a large elbow, wherein the two sides of the large elbow are respectively provided with a straight pipe section, the straight pipe section and the large elbow are integrally bent, and there is no weld in the middle, the horizontal furnace pipe and the large elbow are connected to each other end to end to form a spiral ascending pipe system similar to an ellipse, and the bending radius of the large elbow is equal to 0.5 times the spacing between the two staggered horizontal furnace pipes.

[0006] The straight pipe sections on both sides of the large elbow can be selected in different lengths as needed, generally 100 to 500 mm, preferably 200 to 300 mm.

[0007] The inlet of the medium of the heating furnace radiation row pipe can be located at the upper part or the lower part of the radiation section as required.

[0008] The heating furnace radiation row pipe can be made into a single pass or a multi-pass.

[0009] The utility model has the following beneficial effects:

[0010] 1) The spiral structure is formed by enlarging the elbow of the horizontal furnace tube, which can effectively reduce the pressure drop of the heating furnace radiation pipe system.

[0011] 2) The use of horizontal furnace tubes with enlarged elbows to form a spiral structure can reduce the erosion of the elbows by fixed particles in the medium in the tube and increase the service life of the furnace tube.

[0012] 3) The spiral structure is formed by enlarging the elbow of the horizontal furnace tube, which solves the problem that the conventional circular spiral coil can only be used for single-sided radiation and complex support.

[0013] 4) The horizontal furnace tube is enlarged with an elbow to form a spiral structure, so that the radiation tube burner can be arranged in the center of two rows of tubes (single-sided radiation) or at the outside of two rows of tubes (double-sided radiation).

[0014] 5) The weld is a part that is prone to wear. Having a straight pipe section at both ends of the large elbow can keep the weld away from the wear-prone area of ​​the medium at the bend of the elbow, effectively protecting the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a front view of a heating furnace radiation pipe of the utility model;

[0016] Figure 2 It is a structural schematic diagram of a top view of a heating furnace radiation row pipe of the utility model.

[0017] In the figure: 1-horizontal furnace tube, 2-large elbow, 3-pipe rack, 4-burner, 5-medium inlet, 6-medium outlet, 7-straight pipe section. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described here. On the contrary, the following preferred embodiments are provided to describe the present invention in more detail and specificity, and to fully convey the scope of the present invention to those skilled in the art.

[0019] Use Figure 1 and Figure 2 The schematic diagram shown is used to realize a heating furnace radiation row pipe of the utility model.

[0020] As attached Figure 1 and Figure 2As shown, the utility model provides a heating furnace radiation pipe arrangement, which adopts a structure of a combination of horizontal furnace pipes 1 and large elbows 2. The horizontal furnace pipes 1 are arranged in two rows in a staggered manner, supported by a pipe rack 3, and connected on both sides of the horizontal furnace pipes 1 by large elbows 2, with 200-300 mm straight pipe sections 7 on both sides of the large elbows, and the burners 4 are located in the middle and on both sides of the two rows of horizontal furnace pipes 1, forming a double-sided radiation pipe arrangement structure.

[0021] As attached Figure 1 and Figure 2 As shown, the heating furnace radiation pipe provided by the utility model, the medium of the heating furnace radiation section enters from the medium inlet and outlet 5, and exits from the medium outlet 6. Of course, the medium inlet can be located at the lower part of the radiation section, and the medium outlet can be located at the upper part of the radiation section. The medium can be single-pass or multi-pass.

[0022] The parts of the utility model that are not described in detail are prior art. Although the utility model is demonstrated and introduced in conjunction with specific implementation methods, there are still many ways to implement the technical solution. Technical personnel in the relevant field should understand that various adjustments can be made to the form and details of the utility model without departing from the spirit and scope of the utility model defined by the attached claims, all of which are within the scope of protection of the utility model.

Claims

1. A heating furnace radiation pipe, characterized in that: The invention comprises horizontal furnace tubes and large elbows connecting the horizontal furnace tubes. The horizontal furnace tubes are arranged in two rows in a staggered manner. The middle of the horizontal furnace tubes is supported by a pipe rack. Both sides of the horizontal furnace tubes are connected by large elbows. Both sides of the large elbows are provided with a straight pipe section. The straight pipe section and the large elbows are bent as a whole without a weld in the middle. The horizontal furnace tubes and the large elbows are connected end to end to form a spiral ascending pipe system similar to an ellipse. The bending radius of the large elbows is equal to 0.5 times the spacing between the two staggered horizontal furnace tubes.

2. The heating furnace radiation pipe according to claim 1, characterized in that: The length of the straight pipe section is 100 to 500 mm.

3. The heating furnace radiation pipe according to claim 2, characterized in that: The length of the straight pipe section is 200-300 mm.

4. The heating furnace radiation pipe according to claim 1, characterized in that: The inlet of the medium of the heating furnace radiation row pipe is located at the upper part or the lower part of the radiation section.

5. The heating furnace radiation pipe according to claim 1, characterized in that: The heating furnace radiation pipe arrangement is single-pass or multi-pass.

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