Coal feeding expansion joint and coal feeding transmission structure

Abstract

According to the coal feeding expansion joint and the coal feeding conveying structure, one end of an upper flow guide pipe is fixedly arranged in one end of a connecting pipe, the other end of the connecting pipe is fixedly arranged in a lower mounting pipe, a lower flow guide pipe is connected to an end opening of the lower mounting pipe, and the lower flow guide pipe and the upper flow guide pipe are the same in inner diameter and coaxial; one end of the buffer pipe is arranged on the upper mounting pipe, and the other end of the buffer pipe is arranged on the lower mounting pipe. According to the coal feeding conveying structure, the other end of an upper flow guide pipe of a coal feeding expansion joint is connected with a coal falling pipe, the other end of a lower flow guide pipe is connected with an inclined tee joint, and the inner diameter of the upper flow guide pipe is the same as that of the coal falling pipe. According to the expansion joint, local scouring caused by sudden reduction of the diameter of the pipeline in the coal flow transmission process is avoided, so that the defects of the existing expansion joint are overcome, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to coal chemical industry technical field, more particularly to a kind of coal expansion joint and coal transmission structure. BACKGROUND

[0002] Boiler coal feeder is sent into furnace by coal transmission pipeline, when the pipeline close to furnace is influenced by thermal expansion and contraction, the pipeline is easy to be deformed and damaged due to thermal stress, which affects the continuity and safety of coal transmission, and the expansion joint can absorb the length change to prevent excessive stress caused by thermal expansion and contraction, thereby protecting the safe operation of pipeline system.

[0003] However, the existing expansion joint structure has some shortcomings. The structure is that one end of the inner flow guide pipe is welded in the upper outer pipe, the upper outer pipe is connected with the lower outer pipe through the buffer pipe, the other end of the inner flow guide pipe extends into the lower outer pipe, and the like Figure 1 The coal falls vertically from the coal feeder, so the expansion joint is installed vertically. Since the diameter of the upper outer pipe of the expansion joint is larger than the diameter of the inner flow guide pipe, a step is formed at the connection between the two, which is washed by coal flow, causing the connection to be easily disconnected due to wear, and further causing the flow guide cylinder to fall off, resulting in boiler coal emergency shutdown, which seriously affects the safe and stable operation of the system.

[0004] Therefore, there is an urgent need to improve the expansion joint to improve its service life and reliability, and meet the demand for safe and stable operation of the boiler coal system. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem of overcoming the shortcomings of the prior art, and provides a coal expansion joint and coal transmission structure with reasonable design, simple structure, long service life and safety and reliability.

[0006] The technical scheme adopted to solve the above technical problems is as follows: a coal expansion joint, one end of the upper flow guide pipe is fixedly arranged in one end of the connecting pipe, the other end of the connecting pipe is fixedly arranged in the lower mounting pipe, the lower mounting pipe is connected with the lower flow guide pipe at its port, the lower flow guide pipe has the same inner diameter as the upper flow guide pipe and is coaxial with the upper flow guide pipe, the upper flow guide pipe is provided with the upper mounting pipe outside, one end of the buffer pipe is arranged on the upper mounting pipe, and the other end of the buffer pipe is arranged on the lower mounting pipe.

[0007] Preferably, the other end of the upper flow guide pipe is provided with a flange.

[0008] Preferably, the other end of the lower flow guide pipe is provided with a flange.

[0009] Preferably, the buffer pipe is a corrugated pipe.

[0010] Preferably, the upper mounting pipe is provided with at least two groups of uniformly distributed upper ears, the lower mounting pipe is provided with corresponding lower ears, and the opposite upper and lower ears are provided with pull rods.

[0011] A coal conveying structure comprises a coal falling pipe and an inclined tee, wherein the upper flow guide pipe of the coal expansion joint is connected with the coal falling pipe, and the lower flow guide pipe is connected with the inclined tee, and the inner diameter of the upper flow guide pipe is the same as that of the coal falling pipe.

[0012] The utility model discloses the beneficial effects are as follows:

[0013] The lower flow guide pipe and the upper flow guide pipe of the coal expansion joint of the utility model are coaxial and have the same inner diameter, which ensures that the coal flow will not be locally scoured due to sudden reduction of the pipe diameter during the conveying process, thereby overcoming the shortcomings of the existing expansion joint, improving the service life, and further, the utility model has a more stable structure, can better withstand the impact force of the coal flow and the thermal expansion and cold contraction stress of the pipe, reduces the risk of failure caused by structural looseness or damage, and thereby improves the operation efficiency of the system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the existing expansion joint.

[0015] Figure 2 It is a structural schematic view of the coal expansion joint of the utility model. DETAILED DESCRIPTION

[0016] The utility model will be further described in detail in combination with the drawings and examples, but the utility model is not limited to the following implementation manners.

[0017] In Figure 2 the embodiment, the coal expansion joint comprises a flange 1, an upper flow guide pipe 2, an upper mounting pipe 3, an upper ear 4, a buffer pipe 5, a pull rod 6, a connecting pipe 7, a lower ear 8, a lower mounting pipe 9, and a lower flow guide pipe 10.

[0018] The upper end of the upper flow guide pipe 2 is welded with a flange plate 1, and the lower end is welded in the upper end of a connecting pipe 7, the lower end of the connecting pipe 7 is welded in a lower mounting pipe 9, the lower end of the lower mounting pipe 9 is connected with a lower flow guide pipe 10, the lower mounting pipe 9 and the lower flow guide pipe 10 are integrated, the lower end of the lower flow guide pipe 10 is welded with a flange plate 1, the pipe diameter of the lower mounting pipe 9 is greater than that of the connecting pipe 7, and the pipe diameter of the connecting pipe 7 is greater than that of the lower flow guide pipe 10, the lower flow guide pipe 10 has the same diameter as the upper flow guide pipe 2 and is coaxial, so that the coal flow is not locally scoured due to sudden change of the pipe diameter during transmission, the upper flow guide pipe 2 is externally welded with an upper mounting pipe 3, one end of a buffer pipe 5 is fixedly installed on the upper mounting pipe 3, the other end of the buffer pipe 5 is fixedly installed on the lower mounting pipe 9, the buffer pipe 5 is a corrugated pipe, the corrugated pipe has good flexibility and elasticity, can adapt to the change of the pipe length, thereby absorbing the stress generated by thermal expansion and cold contraction, and preventing the pipeline system from being damaged due to stress concentration.

[0019] The upper mounting pipe 3 is welded with at least two groups of uniformly distributed upper ear plates 4, the lower mounting pipe 9 is provided with lower ear plates 8 corresponding to the upper ear plates 4, and a pair of opposite upper ear plates 4 and lower ear plates 8 are fixedly installed with a pull rod 6, so as to form a stable support structure. The structure not only enhances the overall stability of the utility model, but also can buffer the impact of coal flow and pipe vibration to a certain extent, thereby prolonging the service life.

[0020] The coal conveying structure of the embodiment comprises a coal falling pipe, an inclined tee joint and a coal feeding expansion joint, the upper flow guide pipe 2 of the coal feeding expansion joint is connected with the coal falling pipe through the flange plate 1, and the lower flow guide pipe 10 is connected with the inclined tee joint through the flange plate 1, the inner diameter of the upper flow guide pipe 2 is the same as that of the coal falling pipe, so as to ensure smooth entry of the coal flow and avoid vortex or uneven distribution of the coal flow due to sudden change of the pipe cross-sectional area. After the coal is discharged from the coal feeder, the coal falls vertically through the coal falling pipe and enters the upper flow guide pipe 2 and the lower flow guide pipe 10 of the coal feeding expansion joint, the inner diameters of the upper flow guide pipe 2 and the lower flow guide pipe 10 are the same, so as to form a continuous flow guide channel, and finally the coal enters the inclined tee joint connected with the lower flow guide pipe 10 and is continuously conveyed to the furnace.

Claims

1. A coal feeding expansion joint, characterized in that: One end of the upper guide pipe is fixed inside one end of the connecting pipe, and the other end of the connecting pipe is fixed inside the lower installation pipe. The lower guide pipe is connected to the port of the lower installation pipe. The lower guide pipe and the upper guide pipe have the same inner diameter and are coaxial. The upper installation pipe is set outside the upper guide pipe. One end of the upper installation pipe is set on the upper installation pipe, and the other end of the buffer pipe is set on the lower installation pipe.

2. The coal feeding expansion joint according to claim 1, characterized in that: A flange is provided at the other end of the upper guide pipe.

3. The coal feeding expansion joint according to claim 1, characterized in that: A flange is provided at the other end of the lower guide pipe.

4. The coal feeding expansion joint according to claim 1, characterized in that: The buffer tube is a corrugated pipe.

5. The coal feeding expansion joint according to claim 1, characterized in that: The upper mounting tube is provided with at least two sets of evenly distributed upper ear plates, and the lower mounting tube is provided with a lower ear plate corresponding to the upper ear plate. A pull rod is provided on the upper ear plate and the lower ear plate respectively.

6. A coal feeding and conveying structure, comprising a coal chute and an inclined tee, characterized in that: The upper guide pipe of the coal feeding expansion joint as described in any one of claims 1-5 is connected to the coal drop pipe at one end, and the lower guide pipe is connected to the oblique tee at the other end, wherein the inner diameter of the upper guide pipe is the same as the inner diameter of the coal drop pipe.

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