Heating pipe of steam calcining furnace

Abstract

The utility model relates to the technical field of steam calcining, in particular to a heating pipe of a steam calcining furnace. The pipe cap is arranged at the tail end of the pipe body; the pipe body comprises a straight pipe and a pipe body; one end of the straight pipe is connected with the calcining furnace gas tank; the end, with the smaller outer diameter, of the taper pipe is connected with the other end of the straight pipe, and the end, with the larger outer diameter, of the taper pipe is connected with the pipe cap; the pipe cap comprises a connecting part and a cap body, the connecting part is a cylinder, the cap body is connected to one end of the connecting part, and the other end of the connecting part is connected with the taper pipe. The tail end of the heating pipe is supported without leakage, flowing of materials is guaranteed, scabbing of leaked steam and the materials is prevented, and the operation stability of a furnace body is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam calcination, in particular to a heating pipe of a steam calcination furnace. Background Art

[0002] The steam calcination furnace mainly consists of an alkali inlet part, a furnace body part, an alkali outlet part, a steam inlet and outlet part, and a transmission part. The furnace body is inclined at an angle of 1.7% towards the tail end to ensure the smooth outflow of condensed water in the heating pipe. Four rows of heating pipes arranged in concentric circles are installed in the furnace. Steam passes through the pipes and indirectly heats the heavy alkali in the furnace to produce light ash.

[0003] At present, under the influence of non-condensable gas, the steam calcination furnace needs to be frequently shut down to discharge non-condensable gas. The non-condensable gas accumulates at the end of the heating pipe to generate a heat-affected zone. Since the wall thickness of the end of the heating pipe is the same as that of the pipe cap, leakage will occur at the support weld of the heating pipe, resulting in poor material flow. The leaked steam will form scale with the material, seriously affecting the operation of the furnace body and the stability of the equipment, and the amount of steam damage is large.

[0004] Therefore, the utility model provides a heating pipe of a steam calcination furnace. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a heating pipe of a steam calcination furnace, which solves the problem that a heat-affected zone is accumulated at the end of the existing heating pipe, and leakage occurs at the support weld of the original heating pipe. It realizes that there is no leakage at the end support of the heating pipe, ensures the flow of materials, prevents the leaked steam from forming scale with the materials, and greatly improves the stability of the furnace body operation.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: A heating pipe of a steam calcination furnace, comprising;

[0007] A pipe body for heating condensate gas;

[0008] A pipe cap provided at the end of the pipe body;

[0009] The pipe body includes:

[0010] A straight pipe, one end of which is connected to the gas box of the calcination furnace;

[0011] A tapered pipe, the end with a smaller outer diameter is connected to the other end of the straight pipe, and the end with a larger outer diameter is connected to the pipe cap;

[0012] The pipe cap includes a connecting part and a cap body. The connecting part is in a cylindrical shape. The cap body is connected to one end of the connecting part, and the other end of the connecting part is connected to the tapered pipe;

[0013] The outer diameter of the straight pipe is equal to the minimum outer diameter of the tapered pipe, the outer diameter of the connecting part is equal to the maximum outer diameter of the tapered pipe, and the inner diameters of the straight pipe, the tapered pipe and the connecting part are equal.

[0014] Preferably, a plurality of support plates are annularly arranged around the outer periphery of the pipe cap with the axis as the center, and the support plates are used for buffering and protecting the periphery of the pipe cap.

[0015] Preferably, the support plates are rectangular plates, and the plurality of support plates are perpendicular to the outer side of the pipe cap.

[0016] Preferably, the inner wall of the cap body is an arc surface and the outer wall is a tapered structure.

[0017] The beneficial effects of the present utility model:

[0018] By providing a pipe cap and support plates on the pipe body of the present utility model, and ensuring that its inner diameter remains unchanged while increasing the outer diameter at the connection between the support plates and the pipeline, leakage at the end support of the heating pipe is prevented, the flow of materials is ensured, and the formation of scale caused by the leaked steam and materials is prevented, greatly improving the stability of the furnace body operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the whole of the present utility model.

[0020] In the figure: 1, pipe body; 11, straight pipe; 12, tapered pipe; 2, pipe cap; 21, connecting part; 22, cap body; 3, support plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following further describes the usage method of the present utility model in conjunction with the drawings and specific embodiments.

[0022] As Figure 1 shown, a heating pipe for a steam calcination furnace includes;

[0023] A pipe body 1 for heating the condensate gas;

[0024] A pipe cap 2 provided at the end of the pipe body 1;

[0025] The pipe body 1 includes:

[0026] A straight pipe 11, one end of which is connected to the gas box of the calcination furnace; the wall thickness of the straight pipe 11 is 4 mm.

[0027] A tapered pipe 12, the end with a smaller outer diameter is connected to the other end of the straight pipe 11, and the end with a larger outer diameter is connected to the pipe cap 2;

[0028] The pipe cap 2 includes a connecting portion 21 and a cap body 22. The connecting portion 21 is in the shape of a cylinder. The cap body 22 is connected to one end of the connecting portion 21, and the other end of the connecting portion 21 is connected to the tapered pipe 12. The wall thickness of the connecting portion 21 is 8 mm.

[0029] It is formed by processing solid round steel, ensuring that the inner diameter of the original pipeline remains unchanged and the wall thickness becomes 8 mm, reducing the weld between the pipe cap 2 and the pipe body 1. At the same time, argon arc welding is used instead of manual welding during on-site construction to ensure the welding quality of the weld between the support plate 3 and the pipe cap 2.

[0030] The outer diameter of the straight pipe 11 is equal to the minimum outer diameter of the tapered pipe 12, the outer diameter of the connecting portion 21 is equal to the maximum outer diameter of the tapered pipe 12, and the inner diameters of the straight pipe 11, the tapered pipe 12, and the connecting portion 21 are equal.

[0031] A plurality of support plates 3 are arranged in a circumferential array around the outer side of the pipe cap 2 with the axis as the center. The support plates 3 are used to buffer and protect the periphery of the pipe cap 2.

[0032] From a design perspective, the original pipeline wall thickness was 4 mm. Affected by non-condensable gas, the heat-affected zone was large, and corrosion was severe, often resulting in rust perforation.

[0033] Now the wall thickness is increased to 8 mm, ensuring that the inner diameter of the pipeline remains unchanged and the heat exchange effect remains unchanged. At the same time, it is integrally formed by processing round steel, reducing the weld between the pipe cap 2 and the pipeline. It can effectively extend the service life of the heating pipe and avoid equipment abnormalities caused by furnace head scarring due to leakage.

[0034] The support plate 3 is a rectangular plate, and a plurality of the support plates 3 are perpendicular to the outer side of the pipe cap 2.

[0035] The inner wall of the cap body 22 is an arc surface, and the outer wall is a tapered structure.

[0036] From a construction perspective, the weld between the original pipeline and the support was welded on-site. Construction in a restricted space resulted in poor weld quality and formation. Now, when replacing the pipeline, the inner support is cut off, the pipeline is lifted using the pipeline deflection to provide sufficient construction space, and argon arc welding is used, which can effectively ensure the welding quality.

[0037] During operation, the condensed gas enters the interior of the pipe body 1 again. The length of the straight pipe 11 is relatively long, generally about 35 m. The condensed gas enters and is heated, and flows from the straight pipe 11 through the tapered pipe 12 into the interior of the pipe cap 2, which will cause the pipe cap 2 at the end of the straight pipe 11 to vibrate and contact the outside through the support plate 3 on the pipe cap 2 for buffering and protection, thereby avoiding direct contact between the pipe cap 2 and the outside. At the same time, there will be no leakage at the support at the end of the pipe body 1, ensuring the flow of the material, preventing the formation of scars between the leaked steam and the material, and greatly improving the stability of the furnace body operation.

[0038] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A steam calciner heating tube, comprising: A tube body (1) for heating condensate gas; A tube cap (2) provided at the end of the tube body (1); It is characterized in that The tube body (1) includes: A straight tube (11) with one end connected to the calciner gas box; A tapered tube (12) with the end having a smaller outer diameter connected to the other end of the straight tube (11), and the end having a larger outer diameter connected to the tube cap (2); The tube cap (2) includes a connecting portion (21) and a cap body (22). The connecting portion (21) is in the shape of a cylinder, and the cap body (22) is connected to one end of the connecting portion (21). The other end of the connecting portion (21) is connected to the tapered tube (12); The outer diameter of the straight tube (11) is equal to the minimum outer diameter of the tapered tube (12), the outer diameter of the connecting portion (21) is equal to the maximum outer diameter of the tapered tube (12), and the inner diameters of the straight tube (11), the tapered tube (12), and the connecting portion (21) are equal.

2. The heating tube of a steam calciner according to claim 1, wherein: A plurality of support plates (3) are annularly arrayed around the outer side of the tube cap (2) with the axis as the center. The support plates (3) are used for buffering and protecting the periphery of the tube cap (2).

3. The heating tube of a steam calciner according to claim 2, characterized in that: The support plates (3) are rectangular plates, and the plurality of support plates (3) are perpendicular to the outer side of the tube cap (2).

4. A heating tube of a steam calcining furnace according to claim 1, characterized in that: The inner wall of the cap body (22) is an arc surface, and the outer wall is a conical structure.

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