Novel wear-resistant and anti-blocking slag conveying pipeline

Abstract

The invention provides a novel wear-resistant and anti-blocking slag conveying pipeline. The novel slag conveying pipeline comprises an outer sleeve, a lining pipe and an inner sleeve, wherein the lining pipe is arranged in the outer sleeve in a penetrating manner, and the lining pipe and the outer sleeve are in close contact; the inner sleeve is arranged on the upper portion of an inner cavity of the lining pipe in a penetrating mode. A plurality of connecting pipes are arranged at the top of the inner sleeve at intervals along the axis, and the top ends of the connecting pipes are fixed to the outer sleeve and the lining pipe. A plurality of fan-shaped notches are formed in the bottom of the inner sleeve at intervals, and gas shunting pore plates are mounted at the fan-shaped notches. The slag conveying pipeline is not easy to block, and can be quickly dredged when being restarted after being stopped for a short time during operation, so that the safety and the reliability of the dry type slag removal system are ensured. Abrasion forms of materials in the novel casing pipe to a pipeline during conveying can be roughly divided into three types of scratching, impacting and flushing, and due to the fact that the abrasion-resistant ceramic pipe serves as a lining pipe and the abrasion resistance of corundum, the abrasion loss of the three casing pipes is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic conveying systems for fly ash, and particularly to a new type of wear-resistant and anti-blocking slag conveying pipeline. Background Art

[0002] The slag removal system of Yimin Power Plant has been transformed into a dry slag removal system with a steel belt machine for slag reception and double-tube conveying. In the actual operation of the existing slag conveying pipeline technology, the pipeline layout distance from the boiler house (dry slag machine outlet) to the slag bunker (original dehydration bunker) is about 560 meters, and the climbing height of the slag bunker is about 30 meters. Due to the long conveying distance, the original mechanical slag conveying system or negative pressure pneumatic conveying system equipped with dry slag machines in China cannot meet the requirements. Therefore, a double-tube positive pressure pneumatic conveying system is selected to achieve long-distance slag conveying. Since the dry slag has strong abrasion and relatively coarse particle size and is difficult to convey, each furnace is equipped with 2 sets of independent double-tube slag conveying systems, and when one system fails, the other system can be immediately put into operation. In the nearly one-year operation of the double-tube slag conveying pipeline after the transformation in 2006, many problems have successively occurred, such as: the small tubes inside the double tubes are worn and dropped, causing pipeline blockage; the outer tube wall of the double tubes is not wear-resistant and cannot withstand the erosion of the slag-gas mixture, the groove marks at the bottom of the pipeline are aggravated, and multiple leaks occur. In short, after the system is put into operation, problems such as continuous pipeline blockage, serious pipeline wear and leakage have occurred, and the operating conditions are not satisfactory, making the maintenance personnel busy with repair welding and defect elimination frequently, and at the same time bringing great pollution to the factory environment.

[0003] After multi-party demonstration of the prominent problems in the operation of the double-tube slag conveying pipeline, making full use of the unused old wear-resistant ceramic ash pipes (the old wear-resistant ceramic ash pipes have excellent abrasion resistance due to the inner lining of ceramics, but are easy to block, cannot be knocked hard, and are quite troublesome to remove blockages, so they have been eliminated), combined with the structure and working principle of the double tubes, a new type of wear-resistant and anti-blocking slag conveying pipeline has been designed. Summary of the Invention

[0004] The purpose of the present invention is to provide a wear-resistant and anti-blocking slag conveying pipeline with a simple and reasonable structure. This wear-resistant and anti-blocking slag conveying pipeline is not easy to block, and can be quickly unclogged when restarted after a short shutdown during operation, thus ensuring the safety and reliability of the dry slag removal system. Moreover, the flow rate of the conveyed material is low, the wear rate is low, and the energy consumption is low.

[0005] The present invention provides a new type of wear-resistant and anti-blocking slag conveying pipeline, including an outer sleeve pipe, an inner lining pipe and an inner sleeve pipe. The inner lining pipe is arranged inside the outer sleeve pipe and the two are in close contact; the inner sleeve pipe is arranged in the upper part of the inner cavity of the inner lining pipe; a plurality of connecting pipes are arranged at intervals along the axis at the top of the inner sleeve pipe, and the top ends of the connecting pipes are fixed on the outer sleeve pipe and the inner lining pipe; a plurality of fan-shaped gaps are arranged at intervals at the bottom of the inner sleeve pipe, and a gas distribution hole plate is installed at the fan-shaped gaps.

[0006] Furthermore, the outer sleeve is made of steel, and a plurality of first connection holes are spaced apart along the axis at the top of the outer sleeve.

[0007] Furthermore, the first connecting hole is formed by welding.

[0008] Furthermore, the inner liner is made of ceramic, and the top of the inner liner is provided with a plurality of second connecting holes that correspond to the first connecting holes of the outer sleeve.

[0009] Furthermore, the second connecting hole is cut using a plasma cutting machine.

[0010] Furthermore, the connecting pipe is made of steel.

[0011] Furthermore, the diameter of the outer tube is 194 mm.

[0012] Furthermore, the diameter of the inner liner tube is 180 mm.

[0013] Furthermore, the diameter of the inner sleeve is 60mm.

[0014] Furthermore, the diameter of the connecting pipe is 30mm.

[0015] Compared with existing technologies, the present invention has the following advantages: the wear-resistant and clog-resistant slag conveying pipeline is not easily blocked, and can be quickly cleared after a short-term shutdown and restart, thus ensuring the safety and reliability of the dry slag removal system. Furthermore, it conveys materials at low flow rates, with low wear rates and low energy consumption. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a novel wear-resistant and anti-clogging slag conveying pipeline according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1: Outer tube; 2: Inner liner tube; 3: Inner sleeve tube; 4: Gas distribution orifice plate; 5: Connecting tube. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] like Figure 1 As shown, the specific structure of the wear-resistant and anti-clogging slag conveying pipeline according to a specific embodiment of the present invention includes: an outer sleeve 1, an inner liner 2, and an inner sleeve 3, wherein the inner liner 2 is inserted inside the outer sleeve 1 to form a double-sleeve structure. The outer sleeve 1 is made of steel, and a plurality of first connecting holes are spaced apart along the axis at the top of the outer sleeve 1. The first connecting holes are formed by welding. The inner liner 2 is made of ceramic, and a plurality of second connecting holes corresponding to the first connecting holes of the outer sleeve 1 are spaced apart along the axis at the top of the inner liner 2. The second connecting holes are formed by plasma cutting.

[0023] During normal transport, the inner liner 2 primarily carries ash. Due to the high wear resistance of the wear-resistant ceramic tube, the wear of the wear-resistant and anti-clogging slag transport pipeline is effectively reduced. The inner sleeve 3 has a much smaller inner diameter than the inner liner 2 and is installed in the upper part of the inner cavity of the inner liner 2. The inner sleeve 3 primarily carries air, and its lower part has fan-shaped notches at regular intervals, with gas diversion orifice plates 4 installed at the notches. When material deposits or becomes blocked at a certain point in the pipeline during transport, this accumulation will cause a decrease in pressure at the corresponding pipeline section, thus forcing air to be discharged through the inner sleeve 3. The orifice plate of the next opening in the inner sleeve allows the "bypass air" to return to the original transport pipeline. At this time, the enhanced airflow will blow away the accumulated material, continuously agitate the material, and move it forward. The disturbance generates turbulence, loosening the solid material, preventing pipeline blockage, and ensuring trouble-free material transport. Specifically, the outer sleeve 1, as the outer sleeve of this wear-resistant and anti-clogging slag transport pipeline, has multiple first connection holes spaced along the axis at its top for fixing the inner sleeve 3. Preferably, the first connecting hole is cut by flame welding. The inner liner 2 is inserted inside the outer sleeve 1 to form a double-sleeve structure. During normal transportation, the inner liner 2 mainly carries ash. Due to the high wear resistance of the wear-resistant ceramic tube, the wear of the wear-resistant and anti-clogging slag conveying pipeline is effectively reduced. The top of the inner liner 2 has multiple second connecting holes at intervals along the axis, corresponding to the first connecting holes of the outer sleeve 1, for fixing the inner sleeve 3. Preferably, since the wear-resistant ceramic tube 2 cannot be cut by flame welding or electric welding (which would not meet the process requirements), the second connecting holes can only be cut by a plasma cutting machine. Preferably, since the gap between the inner diameter of the outer sleeve 1 and the outer diameter of the inner liner 2 is extremely small, a 5T winch or two 5T hand-operated hoists are used to thread the pipe. The inner diameter of the inner sleeve 3 is much smaller than that of the wear-resistant ceramic tube 2. Multiple connecting round steel bars 5 are welded at intervals along the axis at the top of the inner sleeve 3. The upper ends of these connecting round steel bars 5 are fixed inside the first connecting hole of the outer sleeve 1 and the second connecting hole of the wear-resistant ceramic tube 2, thus allowing the inner sleeve 3 to pass through the upper part of the inner cavity of the wear-resistant ceramic tube 2. The inner sleeve 3 mainly carries air, and its lower part has multiple fan-shaped notches spaced apart, with gas diversion orifice plates 4 installed at the notches. The process flow and equipment composition of this wear-resistant and anti-clogging slag conveying pipeline are basically the same as those of a conventional positive pressure pneumatic slag removal system: that is, using compressed air via a slag pump to overcome various resistances along the path, the conveyed material is delivered to the storage silo. During normal transport, the wear-resistant ceramic tube 2 mainly carries ash, while the inner sleeve 3 mainly carries air. Compressed air creates a turbulent flow effect as it continuously enters and exits the specially designed gaps and perforated plates on the inner sleeve. However, the gas flow velocity in the wear-resistant ceramic tube 2 is much greater than that in the inner sleeve 3. That is, the flow velocity in the inner sleeve 3 is very small, and the opening has little impact on the main airflow of the wear-resistant ceramic tube 2.When material deposits or becomes blocked at a point in the pipeline during transport, this accumulation causes a decrease in pressure at the corresponding pipeline cross-section. This forces air to escape through the inner sleeve 3, while the orifice plate of the next opening in the inner sleeve redirects the "bypass air" back into the original transport pipe. The increased airflow then disperses the accumulated material, continuously agitating it and moving it forward. This disturbance generates turbulence, loosening the solid material, preventing pipeline blockage, and ensuring trouble-free material transport. Preferably, the outer sleeve 1 has a diameter of 194mm, the wear-resistant ceramic tube 2 has a diameter of 180mm, and the inner sleeve 3 has a diameter of 60mm. The wear on this wear-resistant and anti-clogging slag transport pipeline during transport can be broadly categorized into three types: scratching, impact, and scouring. Because the wear-resistant ceramic tube serves as the inner lining, the wear resistance of corundum effectively reduces the amount of wear on this wear-resistant and anti-clogging slag transport pipeline. Since its renovation and commissioning in August 2007, this wear-resistant and clog-resistant slag conveying pipeline has undergone more than eight years of operation and testing. The number of defects has been minimal, and it has withstood the test of a long winter, demonstrating excellent results. During operation, this wear-resistant and clog-resistant slag conveying pipeline fully utilizes the advantages of wear-resistant ceramic pipes (wear resistance and leak-proofness) and double-pipe design (resistance to clogging). It features high wear resistance, long service life, non-clogging, convenient installation, and significant economic benefits, truly freeing maintenance personnel from heavy pipeline welding work. It effectively ensures the stable operation of the dry slag removal system and achieves its intended purpose. Analysis of actual operating conditions reveals its advantages: 1. Strong system adaptability, high reliability, and non-clogging. Its unique working principle ensures that the system is not prone to clogging. Even after a short-term shutdown and restart, it can be quickly cleared, thus ensuring the safety and reliability of the dry slag removal system. 2. Low flow rate, low wear rate, and low energy consumption. The obsolescence of wear-resistant ceramic pipes was due to frequent and difficult-to-resolve blockages during material transport. However, their excellent wear resistance meant that, over eight years, the area of ​​greatest wear was less than one-tenth of the pipe wall. In summary, this wear-resistant and blockage-resistant slag conveying pipeline is less prone to clogging, and can be quickly cleared after a short-term shutdown and restart, thus ensuring the safety and reliability of the dry slag removal system. Furthermore, it features low material flow rate, low wear rate, and low energy consumption.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A novel wear-resistant and anti-clogging slag conveying pipeline, characterized in that, It includes an outer tube (1), an inner liner tube (2) and an inner sleeve (3). The inner liner tube (2) is inserted inside the outer tube (1) and the two are in close contact. The inner sleeve (3) is inserted into the upper part of the inner cavity of the inner liner tube (2). Multiple connecting tubes (5) are arranged at intervals along the axis at the top of the inner sleeve (3). The top end of the connecting tube (5) is fixed on the outer tube (1) and the inner liner tube (2). Multiple fan-shaped notches are opened at intervals at the bottom of the inner sleeve (3). Gas diversion orifice plates (4) are installed at the fan-shaped notches.

2. The wear-resistant and anti-clogging novel slag conveying pipeline according to claim 1, characterized in that, The outer sleeve (1) is made of steel, and a plurality of first connection holes are provided at intervals along the axis at the top of the outer sleeve (1).

3. The wear-resistant and anti-clogging novel slag conveying pipeline according to claim 2, characterized in that, The first connecting hole was cut by welding.

4. The wear-resistant and anti-clogging novel slag conveying pipeline according to claim 3, characterized in that, The inner liner tube (2) is made of ceramic, and the top of the inner liner tube (2) is provided with a plurality of second connecting holes that correspond to the first connecting holes of the outer sleeve tube (1) at intervals along the axis.

5. The wear-resistant and anti-clogging novel slag conveying pipeline according to claim 4, characterized in that, The second connecting hole is cut by a plasma cutting machine.

6. The wear-resistant and anti-clogging novel slag conveying pipeline according to claim 1, characterized in that, The connecting pipe (5) is made of steel.

7. The wear-resistant and anti-clogging novel slag conveying pipeline according to claim 1, characterized in that, The diameter of the outer tube (1) is 194 mm.

8. The wear-resistant and anti-clogging novel slag conveying pipeline according to claim 1, characterized in that, The diameter of the inner liner tube (2) is 180 mm.

9. The wear-resistant and anti-clogging novel slag conveying pipeline according to claim 1, characterized in that, The inner sleeve (3) has a diameter of 60 mm.

10. The wear-resistant and anti-clogging novel slag conveying pipeline according to claim 1, characterized in that, The diameter of the connecting pipe (5) is 30 mm.

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