Annular header of low-resistance pipe joint

Abstract

The annular header of the low-resistance pipe joint comprises an annular header body, a plurality of first connecting pipes are distributed on the circumference of the lower side of the outer wall of the annular header body, and a plurality of second connecting pipes are distributed on the circumference of the inner side of the outer wall of the annular header body. Forked connecting pipes are arranged on the annular collecting box, and the forked connecting pipes are distributed on the lower side of the outer wall of the annular collecting box in a triangular mode; the forked connecting pipe comprises a first branch pipe and a second branch pipe, and the included angle between the first branch pipe and the second branch pipe is 50-70 degrees.

Description

Technical Field

[0001] The utility model belongs to the technical field of boiler water-cooled separators, and relates to an annular header with low-resistance pipe joints. Background Technique

[0002] In recent years, circulating fluidized bed boilers have been widely used due to their wide fuel adaptability, high combustion efficiency, high combustion intensity, and easy realization of comprehensive utilization of slag. The cyclone separator is an important part of it. It is precisely because the material passes through the cyclone separator for separation and the large particles return to the furnace that circulating combustion is formed. In the development process of circulating fluidized bed boilers, the water-cooled separator, due to its membrane wall structure, can absorb the heat of the flue gas while separating the material, effectively avoiding the situation of afterburning at the separator tail.

[0003] The annular header of the water-cooled separator generally adopts a three-section bending process and then is spliced together. There will be three splicing welds on the header. Holes are evenly opened along the circumferential direction on the inner side and below of the header to install pipe joints and connect them to the separator. To avoid opening holes on the header seams, holes are generally opened on the outer side of the annular header and connected to S-shaped pipe joints. This pipe joint has 4 bending angles, while other pipe joints only have 1 or 2 bending angles. According to the standard formula 2-47 of "Calculation Method for Water Dynamics of Power Station Boilers", the resistance coefficient of a single elbow of a bent pipe is 0.195, and the total of 4 S-shaped bent pipes is 0.78, which is much larger than the resistance coefficients of other pipe joints. The heat transfer will deteriorate due to the large local resistance in the pipe, and there may be a tube explosion accident. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies existing in the prior art, solve the problem that the heat transfer will deteriorate due to the large local resistance in the connecting pipe and there may be a tube explosion accident, and provide an annular header with low-resistance pipe joints.

[0005] To achieve the above purpose, the following technical solutions are adopted:

[0006] The annular header with low-resistance pipe joints includes an annular header. A number of first connecting pipes are circumferentially distributed on the lower side of the outer wall of the annular header, and a number of second connecting pipes are circumferentially distributed on the inner side of the outer wall of the annular header. A bifurcated connecting pipe is arranged on the annular header, and the bifurcated connecting pipe is triangularly distributed on the lower side of the outer wall of the annular header. The bifurcated connecting pipe includes a first branch pipe and a second branch pipe, and the included angle between the first branch pipe and the second branch pipe is 50-70°.

[0007] Preferably, the first connecting pipe, the second connecting pipe and the bifurcated connecting pipe are connected to the annular header by welding.

[0008] Preferably, an external connecting pipe is arranged on the outer side of the outer wall of the annular header, and the external connecting pipe is triangularly distributed on the outer wall of the annular header.

[0009] Preferably, an air vent pipe is provided on the upper side of the outer wall of the annular header.

[0010] Preferably, downward and outward connecting water pipes are respectively provided at the lower ends of the first branch pipe and the second branch pipe.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] The utility model has a simple and reasonable structure. By adopting a bifurcated pipe structure, the water resistance is small, which can effectively solve the problem of many pipe elbows in the connecting pipe structure of the annular header in the conventional water-cooled separator, and the large water flow resistance in the pipe. It can avoid the deterioration of heat transfer caused by the large local resistance in the pipe, prevent pipe burst accidents, and extend the service life and continuous operation time of the circulating fluidized bed boiler. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure 2 It is a schematic diagram of the bifurcated connecting pipe structure of the utility model.

[0015] Figure 3 It is a partial schematic diagram of the annular header of the utility model.

[0016] In the figure: 1, annular header; 2, first connecting pipe; 3, second connecting pipe; 4, bifurcated connecting pipe; 5, first branch pipe; 6, second branch pipe; 7, external connecting pipe; 8, air vent pipe; 9, connecting water pipe. Detailed Embodiments

[0017] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.

[0018] As Figures 1 - 3 shown, an annular header of a low-resistance pipe joint includes an annular header 1. A plurality of first connecting pipes 2 are circumferentially distributed on the lower side of the outer wall of the annular header 1, and a plurality of second connecting pipes 3 are circumferentially distributed on the inner side of the outer wall of the annular header 1. The first connecting pipes 2 and the second connecting pipes 3 are used to connect the annular header 1 with the water-cooled separator;

[0019] A bifurcated connecting pipe 4 is provided on the upper part of the annular header 1. The bifurcated connecting pipe 4 is distributed in a triangular shape on the lower side of the outer wall of the annular header 1, and the lower end of the bifurcated connecting pipe 4 is connected to the water-cooled separator;

[0020] The bifurcated connecting pipe 4 includes a first branch pipe 5 and a second branch pipe 6. The included angle between the first branch pipe 5 and the second branch pipe 6 is 50 - 70°. The smaller included angle results in a smaller water flow resistance inside the bifurcated connecting pipe 4.

[0021] Furthermore, the first connecting pipe 2, the second connecting pipe 3 and the bifurcated connecting pipe 4 are connected to the annular header 1 by welding.

[0022] Furthermore, an external connecting pipe 7 is provided on the outer side of the outer wall of the annular header 1. The external connecting pipe 7 is distributed in a triangular shape on the outer wall of the annular header 1, and hot steam can enter and exit the annular header 1 through the external connecting pipe 7.

[0023] Furthermore, a vent pipe 8 is provided on the upper side of the outer wall of the annular header 1. When a sealing test is performed on the annular header 1, clear water is injected into the annular header 1, and the air inside the annular header 1 can be discharged through the vent pipe 8.

[0024] Furthermore, downward and outward connecting water pipes 9 are respectively provided at the lower ends of the first branch pipe 5 and the second branch pipe 6.

[0025] Working principle: The bifurcated connecting pipe 4 is distributed in a triangular shape on the lower side of the outer wall of the annular header 1. The included angle between the first branch pipe 5 and the second branch pipe 6 of the bifurcated connecting pipe is 50 - 70°. The smaller included angle results in a smaller water flow resistance inside the bifurcated connecting pipe 4, which can effectively solve the problem of many pipe elbows in the connecting pipe structure of the annular header on the conventional water-cooled separator and the large water flow resistance in the pipe, and can avoid the deterioration of heat transfer caused by the large local resistance in the pipe.

[0026] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. An annular header of a low-resistance pipe joint, characterized in that: It includes an annular header (1). A number of first connecting pipes (2) are circumferentially distributed on the lower side of the outer wall of the annular header (1), and a number of second connecting pipes (3) are circumferentially distributed on the inner side of the outer wall of the annular header (1); A bifurcated connecting pipe (4) is arranged on the annular header (1), and the bifurcated connecting pipe (4) is triangularly distributed on the lower side of the outer wall of the annular header (1); The bifurcated connecting pipe (4) includes a first branch pipe (5) and a second branch pipe (6), and the included angle between the first branch pipe (5) and the second branch pipe (6) is 50-70°.

2. The annular header of a low-resistance pipe joint according to claim 1, characterized in that: The first connecting pipe (2), the second connecting pipe (3) and the bifurcated connecting pipe (4) are connected to the annular header (1) by welding.

3. The annular header of a low-resistance pipe joint according to claim 1, characterized in that: An external connecting pipe (7) is arranged on the outer side of the outer wall of the annular header (1), and the external connecting pipe (7) is triangularly distributed on the outer wall of the annular header (1).

4. The annular header of a low-resistance pipe joint according to claim 1, characterized in that: An air vent pipe (8) is arranged on the upper side of the outer wall of the annular header (1).

5. The annular header of a low-resistance pipe joint according to claim 1, characterized in that: Downward and outward connecting water pipes (9) are respectively arranged at the lower ends of the first branch pipe (5) and the second branch pipe (6).

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