A slagging pipe expansion compensation device and a boiler slagging system

Abstract

The utility model discloses a kind of slag pipe expansion compensation device and boiler deslagging system, comprising: compensation mechanism, its inlet is connected with the outlet of slag pipe;Material guide pipe, it is connected with the outlet of compensation mechanism, slag pipe is inserted into material guide pipe;Compensation mechanism includes movablely winding the sealing plate one on the outside of slag pipe, the upper portion of sealing plate one is equipped with movablely sleeved the expansion chamber on the outside of slag pipe, the lower portion of sealing plate one is equipped with the back material chamber that is sleeved on the outside of material guide pipe.The application sets expansion compensation device at the outlet of slag pipe, expansion compensation device includes back material chamber and expansion chamber, and slag ash discharged from slag pipe can enter into expansion chamber from back material chamber, to avoid high-temperature slag ash directly discharged into air, produce spark and other dangerous situations, reduce environmental pollution and occupational hazards;While the setting of expansion chamber, the expansion compensation of axial direction, radial direction and perpendicular direction can be carried out to slag pipe.

Description

Technical Field

[0001] This utility model relates to the field of boiler ash removal technology, specifically to an expansion compensation device for an ash removal pipe and a boiler ash removal system. Background Technology

[0002] The boiler ash discharge system of Pansan Power Plant has repeatedly encountered problems such as insufficient expansion, obstructed expansion, poor sealing, and poor ash discharge during operation. The main reason is that the system is located at the maximum expansion point between the moving end of the boiler body (i.e., the ash discharge pipe) and the fixed end of the ash cooler, which leads to obstructed expansion. In addition, the system is located at the junction of the hot end inside the boiler furnace and the cold end outside, which is the most severe working environment. The traditional connection between the moving end of the boiler body (i.e., the ash discharge pipe) and the ash cooler does not have a compensation mechanism between the ash discharge pipe and the ash cooler. As a result, ash containing high-temperature gas can escape from between the two, and the high-temperature ash usually contains sparks.

[0003] At the same time, reliable operation of the slag discharge equipment is required to control the bottom material level of the boiler and adjust the pressure of the air chamber. If there are defects in the slag discharge, it will seriously affect the safe and reliable operation of the boiler and pose great safety hazards to maintenance and operation personnel. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to solve the problem of expansion obstruction and high-temperature ash runoff caused by temperature difference between the boiler body ash discharge pipe and the ash cooler.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] An expansion compensation device for a slag discharge pipe, comprising:

[0007] The compensation mechanism has its inlet connected to the outlet of the slag discharge pipe;

[0008] The feed pipe is connected to the outlet of the compensation mechanism, and the slag discharge pipe extends into the feed pipe;

[0009] The compensation mechanism includes a sealing plate that is movably wrapped around the outside of the slag discharge pipe. The upper part of the sealing plate is provided with an expansion chamber that is movably sleeved on the outside of the slag discharge pipe, and the lower part of the sealing plate is provided with a return chamber that is sleeved on the outside of the guide pipe. A return gap is left between the sealing plate and the guide pipe, so that the slag and ash falling from the slag discharge pipe can enter the expansion chamber from the return chamber.

[0010] This application introduces an expansion compensation device at the outlet of the slag discharge pipe. The expansion compensation device includes a return chamber and an expansion chamber. The slag discharged from the slag discharge pipe can enter the expansion chamber from the return chamber, thereby avoiding the direct discharge of high-temperature slag into the air and the occurrence of dangerous situations such as sparks, reducing environmental pollution and occupational hazards. At the same time, the expansion chamber can provide axial, radial and vertical expansion compensation for the slag discharge pipe, avoiding the risk of maintenance work required after expansion and tearing. It meets the high temperature resistance and tight sealing requirements of boilers under harsh operating conditions. The design is reasonable, the structure is simple, and it is economical and practical.

[0011] As a further embodiment of this utility model: the expansion chamber includes an externally disposed expansion skin, the expansion skin is wrapped around the outside of the slag discharge pipe, and a negative pressure air duct is connected to the expansion skin, the negative pressure air duct being in communication with the internal expansion chamber.

[0012] As a further embodiment of this utility model: the return chamber includes a sealed cylinder, the bottom of which is connected to the guide pipe, and a second sealing plate is provided at the top, wherein the second sealing plate is located above the first sealing plate and there is a gap between them, and the return chamber communicates with the expansion chamber through the gap.

[0013] As a further embodiment of this utility model: a vertical stop bar is fixed in the return material chamber and at the bottom of the sealing plate, wherein the bottom of the vertical stop bar and the inner bottom wall of the sealing cylinder are left with a material guiding gap.

[0014] As a further embodiment of this utility model, the second sealing plate and the sealing cylinder are detachably connected by bolts or pins.

[0015] As a further embodiment of this utility model: a sealing cavity is provided at the upper part of the sealing plate and at the position in contact with the slag discharge pipe, and the sealing cavity is movably connected to the slag discharge pipe.

[0016] As a further embodiment of this utility model: the sealing cavity includes a sealing horizontal plate two that is movably sleeved on the outside of the slag discharge pipe, and a sealing horizontal plate one is connected to the bottom of the sealing horizontal plate two. The bottom of the sealing horizontal plate one is connected to the sealing plate one through a sealing vertical cylinder one. A sealing vertical cylinder two is provided between the sealing horizontal plate two and the sealing horizontal plate one.

[0017] As a further embodiment of this utility model: the side of the sealing vertical cylinder two near the slag discharge pipe is connected to the sealing horizontal plate two via an inclined cylinder.

[0018] As a further embodiment of this utility model: the return chamber and the guide pipe are connected by a support plate.

[0019] This utility model also discloses a boiler ash removal system, including an ash discharge pipe connected to the boiler furnace, and an expansion compensation device for the ash discharge pipe, wherein the outlet of the guide pipe is connected to a ash cooler.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This application installs an expansion compensation device at the outlet of the slag discharge pipe. The expansion compensation device includes a return chamber and an expansion chamber. The slag discharged from the slag discharge pipe can enter the expansion chamber from the return chamber, thereby avoiding the direct discharge of high-temperature slag into the air and the occurrence of dangerous situations such as sparks, thus reducing environmental pollution and occupational hazards.

[0022] The expansion chamber in this application can compensate for the expansion of the slag discharge pipe in the axial, radial and vertical directions, achieve pressure differential balance without power, avoid the risk of maintenance work required after expansion tearing, meet the high temperature resistance and tight sealing requirements of boiler under harsh operating conditions, and is reasonably designed, simple in structure and economical and practical. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a boiler ash removal system according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the compensation mechanism and the guide tube in an embodiment of this utility model;

[0025] Figure 3 This is a partial structural diagram of the compensation mechanism and the guide tube in an embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the sealed cavity in an embodiment of the present invention;

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Furnace chamber;

[0029] 2. Slag discharge pipe;

[0030] 3. Compensation mechanism; 31. Expansion skin; 32. Negative pressure duct; 33. Sealing cavity; 331. Sealing vertical cylinder one; 332. Sealing horizontal plate one; 333. Connecting rod; 334. Sealing vertical cylinder two; 335. Sealing horizontal plate two; 336. Inclined cylinder; 34. Sealing cylinder body; 35. Vertical stop bar; 36. Sealing plate one; 37. Support plate; 38. Sealing plate two;

[0031] 4. Feed pipe;

[0032] 5. Slag cooler. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] Example 1

[0035] Reference Figure 2 and Figure 3 An expansion compensation device for a slag discharge pipe includes a compensation mechanism 3, which includes an expansion skin 31, a negative pressure air duct 32, a sealing cavity 33, a sealing cylinder 34, a vertical stop bar 35, a first sealing plate 36, a support plate 37, and a second sealing plate 38.

[0036] Among them, the sealing plate 36 is an annular plate, and the slag pipe 2 can pass through the sealing plate 36. There is a gap between the two. The slag pipe 2 can move vertically, radially, or along the axial direction of the slag pipe 2 in the middle through hole of the sealing plate 36.

[0037] It should be noted that the top of the sealing plate 36, the sealing cylinder 34, the sealing plate 38, and the guide pipe 4 form a return material chamber; the expansion skin 31, the sealing plate 38, and the sealing plate 36 form an expansion chamber, and the expansion chamber is connected to the return material chamber.

[0038] The feed pipe 4 is located at the bottom of the sealing plate 36 and is a fixed pipe that cannot be moved. A gap is opened between the top of the feed pipe 4 and the sealing plate 36 for the passage of slag and ash, and this gap is connected to the return chamber. The bottom of the slag discharge pipe 2 can enter the feed pipe 4, and the outer diameter of the slag discharge pipe 2 is smaller than the inner diameter of the feed pipe 4. Therefore, the slag enters the feed pipe 4 from the slag discharge pipe 2, and the generated slag and ash can enter the return chamber through the gap between the feed pipe 4 and the sealing plate 36. Then, it can enter the expansion chamber through the return chamber, thereby preventing high-temperature slag and ash from escaping into the air from the connection gap and causing problems such as sparks.

[0039] Reference Figure 2 and Figure 3The sealing cylinder 34 has a central opening that fits perfectly onto the outside of the guide pipe 4. The bottom of the sealing cylinder 34 is fixed to the guide pipe 4 using a support plate 37. The two can be detachably connected by welding or by bolts and pins. There is also a gap between the outermost ring of the sealing plate 36 and the vertical surface of the sealing cylinder 34 for the passage of slag and ash. A vertical stop bar 35 is fixed at the bottom of the sealing plate 36 and inside the sealing cylinder 34, with a gap between the bottom of the vertical stop bar 35 and the bottom surface of the sealing cylinder 34. The sealing plate 38 is installed on the top of the sealing cylinder 34. The two can be detachably connected by bolts or pins. There is a gap between the bottom of the sealing plate 38 and the sealing plate 36 for the passage of slag and ash. There is a gap between the end of the sealing plate 38 facing the slag discharge pipe 2 and the slag discharge pipe 2.

[0040] The process of slag and ash entering the return material chamber is as follows: First, it enters the return material chamber through the gap between the guide pipe 4 and the sealing plate 36. Then, it exits through the gap between the baffle 35 and the bottom surface of the sealing cylinder 34. Next, it enters the expansion chamber through the gap between the sealing plate 38 and the sealing plate 36. Finally, it is extracted from the negative pressure duct 32 in the expansion chamber. (Refer to...) Figure 1 The arrow in the image points to the ash; ash can be collected during this process. This prevents high-temperature ash from being released into the air and generating high-temperature sparks.

[0041] Reference Figure 3 The expansion skin 31 is fitted onto the outside of the slag discharge pipe 2. Its bottom is connected to the sealing plate 38. A hole is reserved in the middle of the expansion skin 31. The slag discharge pipe 2 can be movably connected to the hole and can move vertically, radially, or along the axial direction of the slag discharge pipe 2.

[0042] Reference Figure 3 A sealing cavity 33 is provided inside the expansion chamber and outside the slag discharge pipe 2. The sealing cavity 33 can prevent slag and ash from flowing out again from the gap between the slag discharge pipe 2 and the sealing plate 36 or flowing into the feed pipe 4 or the expansion chamber.

[0043] Reference Figure 4 The sealing cavity 33 includes a second sealing horizontal plate 335 movably sleeved outside the slag discharge pipe 2. The bottom of the second sealing horizontal plate 335 is connected to a first sealing horizontal plate 332. The bottom of the first sealing horizontal plate 332 is connected to the first sealing plate 36 via a first sealing vertical cylinder 331. A second sealing vertical cylinder 334 is provided between the second sealing horizontal plate 335 and the first sealing horizontal plate 332. The side of the second sealing vertical cylinder 334 closest to the slag discharge pipe is connected to the second sealing horizontal plate 335 via an inclined cylinder 336. The height of the second sealing vertical cylinder 334 is greater than the height between the second sealing horizontal plate 335 and the first sealing horizontal plate 332.

[0044] Example 2

[0045] Reference Figure 1 A boiler ash removal system includes a furnace 1, an ash discharge pipe 2, a compensation mechanism 3, a feed pipe 4, and a ash cooler 5. The compensation mechanism 3 is located outside the outlet of the ash discharge pipe 2, and the bottom of the ash discharge pipe 2 can enter the feed pipe 4. The outlet of the feed pipe 4 is connected to the ash cooler 5. The furnace 1 has a very low initial temperature and a very high operating temperature. The sudden high temperature will cause the furnace 1 to move, which will in turn drive the ash discharge pipe 2 to move vertically and radially in three dimensions. However, the traditional device does not have a compensation mechanism 3 between the ash discharge pipe 2 and the feed pipe 4. Therefore, ash containing high-temperature gas will escape from between the two. The escaped ash usually contains sparks. This application can not only prevent ash from escaping but also play a compensation role.

[0046] The various structures on compensation mechanism 3 are currently mainly made of 0Cr25Ni20 or S30815 material to improve the wear resistance of the equipment under high-temperature conditions. By selecting metal materials and using thermal expansion and other methods, combined with the mechanical labyrinth sealing principle, expansion chambers and return chambers are set up. Key technologies such as optimized mechanical structure design, non-powered pressure differential balance, scientific material selection, and automated control are used to ensure the stable operation of the boiler ash discharge equipment under extremely harsh conditions.

[0047] Based on the thermal expansion monitored during long-term operation of the boiler, the maximum vertical axial expansion of the boiler in this application is approximately 180 mm, the radial expansion to the left and right is approximately 20 mm, and the front and rear expansion is approximately 50 mm. Based on this operating condition, the expansion compensation device of this application is adopted. This device has a compensation movable chamber set between the slag discharge pipe and the feed pipe. The expansion of the boiler is fully compensated through the movable chamber, which fully meets the expansion requirements in the three dimensions during operation and avoids the situation of expansion obstruction.

[0048] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A slag discharge pipe expansion compensation device, characterized in that, include: The compensation mechanism (3) has its inlet connected to the outlet of the slag discharge pipe; The feed pipe (4) is connected to the outlet of the compensation mechanism (3), and the slag discharge pipe extends into the feed pipe (4); The compensation mechanism (3) includes a sealing plate (36) that is movably wrapped around the outside of the slag discharge pipe. The upper part of the sealing plate (36) is provided with an expansion chamber that is movably sleeved on the outside of the slag discharge pipe. The lower part of the sealing plate (36) is provided with a return chamber that is sleeved on the outside of the guide pipe (4). A return gap is left between the sealing plate (36) and the guide pipe (4), so that the slag and ash falling from the slag discharge pipe can enter the expansion chamber from the return chamber.

2. The expansion compensation device for a slag discharge pipe according to claim 1, characterized in that: The expansion chamber includes an externally installed expansion skin (31), which is wrapped around the outside of the slag discharge pipe, and a negative pressure air duct (32) is connected to the expansion skin (31), which is in communication with the internal expansion chamber.

3. The expansion compensation device for a slag discharge pipe according to claim 1, characterized in that: The return chamber includes a sealing cylinder (34), the bottom of which is connected to the guide pipe (4), and a second sealing plate (38) is provided on the top. The second sealing plate (38) is located above the first sealing plate (36) and there is a gap between them. The return chamber is connected to the expansion chamber through this gap.

4. The expansion compensation device for a slag discharge pipe according to claim 3, characterized in that: A vertical stop bar (35) is fixed in the return chamber and at the bottom of the sealing plate (36), wherein the bottom of the vertical stop bar (35) and the inner bottom wall of the sealing cylinder (34) have a material guiding gap.

5. The expansion compensation device for a slag discharge pipe according to claim 3, characterized in that: The sealing plate 2 (38) and the sealing cylinder (34) are detachably connected by bolts or pins.

6. The expansion compensation device for a slag discharge pipe according to claim 1, characterized in that: A sealing cavity (33) is provided on the upper part of the sealing plate (36) and at the position in contact with the slag pipe, and the sealing cavity (33) is movably connected to the slag pipe.

7. The expansion compensation device for a slag discharge pipe according to claim 6, characterized in that: The sealing cavity (33) includes a sealing horizontal plate two (335) that is movably sleeved outside the slag pipe (2). The bottom of the sealing horizontal plate two (335) is connected to a sealing horizontal plate one (332). The bottom of the sealing horizontal plate one (332) is connected to the sealing plate one (36) through a sealing vertical cylinder one (331). A sealing vertical cylinder two (334) is provided between the sealing horizontal plate two (335) and the sealing horizontal plate one (332).

8. The expansion compensation device for a slag discharge pipe according to claim 7, characterized in that: The sealing vertical cylinder two (334) is connected to the sealing horizontal plate two (335) on the side near the slag discharge pipe via an inclined cylinder (336).

9. The expansion compensation device for a slag discharge pipe according to claim 1, characterized in that: The return chamber and the guide pipe (4) are connected by a support plate (37).

10. A boiler ash removal system, comprising an ash discharge pipe (2) connected to the boiler furnace (1), characterized in that, It also includes the slag pipe expansion compensation device as described in any one of claims 1-9, wherein the outlet of the feed pipe (4) is connected to the slag cooler (5).

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