An integrally formed coal feed pipe for a circulating fluidized bed boiler

Abstract

The utility model provides a kind of integrally formed coal feeding pipe for circulating fluidized bed boiler, including integrally casted front pipe and rear pipe, the front pipe is equal diameter rectangular tube, the rear pipe is variable diameter rectangular tube and the smaller end is connected with the front pipe.

Description

Technical Field

[0001] This utility model relates to the field of coal feed pipe technology, specifically to an integrally formed coal feed pipe for a circulating fluidized bed boiler. Background Technology

[0002] A coal feed pipe is a pipe used by a coal feeder to transport raw coal to the furnace. Utility model patent CN203068499U discloses a wear-resistant and high-temperature resistant coal feed pipe for a circulating fluidized bed boiler, comprising a pipe divided into a front pipe and a rear pipe. The front pipe has a thickness of not less than 40mm, and the rear pipe has a thickness of not less than 25mm. The front and rear pipes are made of different materials and are connected together by welding, resulting in a weld seam.

[0003] However, during the use of the above-mentioned utility model, due to the high temperature, expansion cracks will occur at the weld, causing the front and rear ends of the coal feed pipe to fall off, causing the water-cooled wall tubes around the coal feed port to wear through and burst (due to coal scouring), the furnace bed material to burn, the water-cooled wall tubes to burn, affecting the safe operation of the boiler and generating high maintenance costs. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides an integrally molded coal feed pipe for circulating fluidized bed boilers, which has good safety and long service life.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An integrally formed coal feed pipe for a circulating fluidized bed boiler includes an integrally cast front pipe and a rear pipe, wherein the front pipe is a rectangular pipe of equal diameter and the rear pipe is a rectangular pipe of varying diameter with the smaller end connected to the front pipe.

[0007] Furthermore, the coal-falling section on the inner wall of the rear pipe is provided with multiple left buffer ridges and multiple right buffer ridges. The left buffer ridges are inclined toward the lower left corner of the front pipe, and the right buffer ridges are inclined toward the lower right corner of the front pipe.

[0008] Furthermore, the left buffer ridge and the right buffer ridge are arranged alternately.

[0009] Furthermore, the outlet of the front tube is a beveled cut.

[0010] Compared with the prior art, the present invention has the following beneficial technical effects:

[0011] This utility model discloses an integrally molded coal feed pipe for circulating fluidized bed boilers. The integral casting process avoids the risk of weld point detachment, ensures production safety, and extends the effective service life of the coal feed pipe. Attached Figure Description

[0012] Figure 1 This is a structural diagram of an integrally molded coal feed pipe for a circulating fluidized bed boiler, according to this utility model.

[0013] Figure 2 yes Figure 1 Sectional view of AA.

[0014] Among them: 1. front tube; 2. rear tube; 21. left buffer ridge; 22. right buffer ridge. Detailed Implementation

[0015] Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0016] Example 1

[0017] like Figure 1 , 2 As shown, an integrally formed coal feed pipe for a circulating fluidized bed boiler includes an integrally cast front pipe 1 and a rear pipe 2. The front pipe 1 is a rectangular tube of equal diameter with a thickness of 40 mm on all four side walls, and its outlet is a beveled cut, which can effectively improve the coal feeding rate and speed. The rear pipe 2 is a rectangular tube of varying diameter, with its smaller end connected to the front pipe 1. The bottom wall of the rear pipe 2 is 40 mm thick, and the thickness of each side wall and top wall is 25 mm.

[0018] The coal-falling section on the inner wall of the rear pipe 2 is equipped with multiple left buffer ridges 21 and multiple right buffer ridges 22. The left buffer ridges 21 are inclined towards the lower left corner of the front pipe 1, and the right buffer ridges 22 are inclined towards the lower right corner of the front pipe 1. The left buffer ridges 21 and right buffer ridges 22 are staggered, which can slow down the falling speed of coal and store a small amount of coal, avoiding direct impact of coal on the inner wall of the rear pipe 2 and thus improving the service life of the rear pipe 2.

[0019] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrally formed coal feed pipe for a circulating fluidized bed boiler, characterized in that: It includes a front tube and a rear tube integrally cast, wherein the front tube is a rectangular tube of equal diameter and the rear tube is a rectangular tube of varying diameter with the smaller end connected to the front tube.

2. The integrally formed coal feed pipe for a circulating fluidized bed boiler according to claim 1, characterized in that: The coal dropping section on the inner wall of the rear pipe is provided with multiple left buffer ridges and multiple right buffer ridges. The left buffer ridges are inclined toward the lower left corner of the front pipe, and the right buffer ridges are inclined toward the lower right corner of the front pipe.

3. The integrally formed coal feed pipe for a circulating fluidized bed boiler according to claim 2, characterized in that: The left and right buffer ridges are arranged alternately.

4. The integrally molded coal feed pipe for a circulating fluidized bed boiler according to claim 3, characterized in that: The outlet of the front tube is a beveled cut.

Images