Anti-slag-blocking structure and method for semi-waste boiler gasification furnace

Abstract

The invention belongs to the technical field of gasification furnaces, and relates to an anti-slag-blocking structure and method for a semi-waste boiler gasification furnace, the anti-slag-blocking structure for the semi-waste boiler gasification furnace comprises a gasification furnace body, and a waste boiler section slag discharging pipe, a connecting pipe and a chilling section cooling pipe which are respectively arranged in the gasification furnace body and are sequentially communicated from top to bottom; the vertical section of the waste boiler section slag discharging pipe is of a big-end-up conical structure, the length of the conical wall of the waste boiler section slag discharging opening is adjusted according to the inclination angle of the waste boiler section slag discharging opening, the inner diameter of the water cooler in the waste boiler section is maintained to be 0.4074-0.4088 times of the inner diameter of the semi-waste boiler gasification furnace body, and the slag blocking phenomenon of the waste boiler section slag discharging opening and the water cooler in the waste boiler section is reduced. According to the structure provided by the invention, the slag discharging channel is not easy to block slag, and stable operation of equipment and production is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of gasifiers, and relates to a slag blocking prevention structure and method for a semi-waste boiler gasifier. Background Art

[0002] Gasifier is one of the commonly used equipment in coal chemical industry, especially the multi-nozzle opposed waste boiler-quenching process gasifier, referred to as semi-waste boiler gasifier. The semi-waste boiler gasifier body includes a combustion chamber section, a waste boiler section and a quenching chamber section from top to bottom. The semi-waste boiler gasifier can generally produce 9.0MPa high-pressure steam as a by-product and recover the sensible heat of high-temperature water gas; however, the following problems often occur during the operation of the gasifier:

[0003] When the ash falling from the lower slag outlet of the waste boiler section enters the quenching chamber section, it needs to pass through the lower water cooler. However, because the high-temperature ash has great adhesion, it will adhere to the surface of the lower water cooler. As the ash continues to accumulate, the ash on the inner wall of the lower water cooler becomes thicker and thicker, making the slag channel between the ash and the quenching chamber section narrower, resulting in frequent slag blockage at the lower slag outlet of the waste boiler section, which in turn makes it impossible for water gas and ash to pass through the lower water cooler. All the ash is accumulated in the waste boiler section, affecting the stable operation of the equipment.

[0004] When the slag outlet of the waste boiler section is blocked, the semi-waste boiler gasifier is forced to stop. The slag digging personnel enter the furnace of the waste boiler section through the uppermost manhole on the semi-waste boiler gasifier body to clean the ash accumulated in the waste boiler section, which not only increases the maintenance cost and the safety maintenance risk of personnel, but also is not conducive to the stable operation of production. Summary of the invention

[0005] Aiming at the technical problem that slag blockage frequently occurs at the lower slag outlet of the waste boiler section of the existing gasifier, affecting the stable operation of the equipment and production, the present invention provides a slag blockage prevention structure and method for a semi-waste boiler gasifier.

[0006] The present invention designs the waste boiler section slag pipe to have a conical structure and limits the ratio of the side wall length of the waste boiler section slag pipe to the quenching section cooling pipe, so that the inner diameter of the slag outlet of the waste boiler section slag pipe is maintained within a relatively large range, the slag channel is not prone to slag blockage, and stable operation of equipment and production is ensured.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A slag blocking prevention structure for a semi-waste boiler gasifier comprises a waste boiler section slag opening, a waste boiler section lower water cooler and a quenching section cooling pipe which are sequentially connected from top to bottom; the waste boiler section slag opening is a tubular structure with an inverted cone in longitudinal section; the length of the cone wall of the waste boiler section slag opening is adjusted according to the inclination angle of the waste boiler section slag opening, the inner diameter of the waste boiler section lower water cooler is maintained at 0.4074 to 0.4088 times the inner diameter of the semi-waste boiler gasifier body, and the slag blocking phenomenon of the waste boiler section slag opening and the waste boiler section lower water cooler is reduced.

[0009] It is further defined that the inclination angle of the lower slag opening of the waste boiler section is 30°. At this time, the length of the cone wall of the lower slag opening of the waste boiler section is shortened so that the ratio of the cone wall length of the lower slag opening of the waste boiler section to the inner diameter of the semi-waste boiler gasifier body is 0.345:1.

[0010] It is further defined that the anti-slag blocking structure of the semi-waste boiler gasification furnace also includes a flange connector, and the lower water cooler of the waste boiler section is connected to the cooling pipe of the quenching section through the flange connector.

[0011] It is further defined that the semi-waste boiler gasifier anti-slag blocking structure also includes a support plate arranged between the flange connector and the inner wall of the gasifier body; one end of the support plate is connected to the flange connector, and the other end of the support plate is inclined from bottom to top and connected to the inner wall of the gasifier body; the inclination angle of the support plate is 10° to 20°.

[0012] It is further defined that the flange connection member includes an inner ring member and a tray flange which are sequentially sleeved from the inside to the outside, and the support plate is connected to the tray flange.

[0013] It is further defined that the flange connector also includes an upper connecting ring plate, a quenching ring and a fastener; the upper connecting ring plate is located at the upper part of the tray flange and is sleeved on the outer wall of the lower water cooler of the waste boiler section; the quenching ring is located at the lower part of the tray flange and is connected to the outer wall of the cooling pipe of the quenching section, and the fastener passes through the quenching ring, the tray flange and the upper connecting ring plate in sequence and is fastened.

[0014] It is further defined that there are a plurality of fasteners, and the plurality of fasteners are evenly distributed in the radial direction of the tray flange.

[0015] A method for preventing slag blocking in a gasifier based on the semi-waste boiler gasifier slag blocking prevention structure comprises the following steps:

[0016] S1. According to the anti-blocking slag structure of the semi-waste boiler gasifier, the length of the cone wall of the waste boiler section slag opening in the semi-waste boiler gasifier body is adjusted according to the inclination angle of the waste boiler section slag opening, so that the ratio of the cone wall length of the waste boiler section slag opening to the inner diameter of the semi-waste boiler gasifier body is 0.345:1, and the inner diameter of the waste boiler section lower water cooler is maintained at 0.4074 to 0.4088 times the inner diameter of the semi-waste boiler gasifier body;

[0017] S2. The ash from the waste boiler section in the semi-waste boiler gasifier body flows downward continuously along the conical wall of the lower slag outlet of the waste boiler section, and enters the cooling pipe of the quenching section through the waste boiler section lower water cooler with a larger inner diameter, which can reduce slag blockage; at the same time, cooling water is introduced into the cooling pipe of the quenching section to wash the ash, ensuring that the ash is discharged from the bottom of the semi-waste boiler gasifier body.

[0018] It is further defined that cooling water is introduced into the quenching section cooling pipe through a water inlet pipe connected to the quenching section cooling pipe.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention transforms the lower slag opening of the waste boiler section and the lower water cooler of the waste boiler section. The length of the cone wall of the lower slag opening of the waste boiler section, the inner diameter of the lower water cooler of the waste boiler section and the inner diameter of the semi-waste boiler gasifier body is 0.345:

[0021] (0.4074~0.4088): 1. The structure formed in this way keeps the inner diameter of the lower water cooler of the waste boiler section within a larger range relative to the inner diameter of the semi-waste boiler gasifier body and the inner diameter of the waste boiler section water-cooled wall, and the slag lowering channel is not prone to slag blockage, thereby effectively reducing the risk of slag blockage and ensuring stable operation of equipment and production.

[0022] 2. In the present invention, a support plate is arranged between the flange connector and the inner wall of the semi-waste boiler gasifier body, and the connection between the waste boiler section slag pipe and the quenching section cooling pipe is supported by the support plate and the flange connector to ensure the stability of the connection. Preferably, the inclination angle of the support plate is 10° to 20°, at which time the support plate can provide the maximum support effect.

[0023] 3. The present invention connects the water cooler under the waste boiler section with the cooling pipe of the quenching section through a flange connector to ensure the tightness of the connection and facilitate maintenance, disassembly and replacement; it is further fixed by fasteners to ensure the stability of the structural connection.

[0024] 4. The flange connector of the present invention includes an inner ring member and a tray flange which are sequentially sleeved from the inside to the outside; the flange connector also includes an upper connecting ring plate which is placed on the upper part of the tray flange and sleeved on the outer wall of the water cooler under the waste boiler section, and a quenching ring which is placed on the lower part of the tray flange and connected to the outer wall of the cooling pipe of the quenching section. It is not only simple in structure and easy to install, but also has strong connection stability and tightness, so that the gasifier can operate safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the connection between the waste boiler section and the quenching section of the semi-waste boiler gasifier of the present invention;

[0026] Figure 2 This is the structural diagram of the quenching section;

[0027] Figure 3for Figure 2 Enlarged view of point A in the middle;

[0028] in:

[0029] 1-semi-waste boiler gasification furnace body; 100-waste boiler section water-cooled wall; 101-waste boiler section lower slag outlet; 2-waste boiler section lower water cooler; 3-quenching section cooling pipe; 4-support plate; 5-water inlet pipe; 6-inner ring; 7-fastener; 8-upper connecting ring plate; 9-tray flange; 10-toothed combination pad; 11-ceramic fiber layer; 12-quenching ring. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figure 1 and Figure 2 The slag blocking prevention structure of the semi-waste boiler and semi-waste boiler gasifier provided in this embodiment comprises a waste boiler section slag opening 101, a waste boiler section lower water cooler 2 and a quenching section cooling pipe 3 which are sequentially connected from top to bottom; the waste boiler section slag opening 101 is a tubular structure with an inverted cone in longitudinal section, and the length of the cone wall of the waste boiler section slag opening 101 is adjusted according to the inclination angle of the waste boiler section slag opening 101, and the inner diameter of the waste boiler section lower water cooler 2 is maintained at 0.4074 to 0.4088 times the inner diameter of the semi-waste boiler gasifier body 1, thereby reducing the slag blocking phenomenon of the waste boiler section slag opening 101 and the waste boiler section lower water cooler 2.

[0033] In this embodiment, since the waste boiler section lower slag opening 101 is used to discharge the ash generated by the waste boiler section, in order to ensure smooth discharge of the ash, the inclination angle of the waste boiler section lower slag opening 101 is 30°, and the length of the cone wall of the waste boiler section lower slag opening 101 is shortened, so that the ratio of the cone wall length of the waste boiler section lower slag opening 101 to the inner diameter of the semi-waste boiler gasification furnace body 1 is 0.345:1. Through the above arrangement, the ratio of the cone wall length of the waste boiler section lower slag opening 101, the inner diameter of the waste boiler section lower water cooler 2, and the inner diameter of the semi-waste boiler gasification furnace body 1 is 0.345:(0.4074-0.4088):1, and the inner diameter of the waste boiler section lower water cooler 2 can be maintained in a larger range than the inner diameter of the semi-waste boiler gasification furnace body 1, thereby reducing the slag blocking phenomenon of the waste boiler section lower slag opening 101 and the waste boiler section lower water cooler 2.

[0034] In this embodiment, the inner diameter of the semi-waste boiler gasification furnace body 1 is 4200 mm, the cone wall length of the waste boiler section lower slag outlet 101 is 1449 mm, and the inner diameter of the waste boiler section lower water cooler 2 is between 1711 mm and 1717 mm.

[0035] During implementation, the inner diameter of the water cooler 2 under the waste boiler section is 1711mm, 1713mm, 1715mm or 1717mm.

[0036] In this embodiment, the semi-waste boiler gasifier body 1 is a cylindrical structure, and its interior is divided into a combustion section, a waste boiler section and a quenching section from top to bottom, wherein the waste boiler section includes a waste boiler section water-cooled wall 100 and a waste boiler section lower slag opening 101, and the waste boiler section lower slag opening 101 is located below the waste boiler section water-cooled wall 100 and is connected to the waste boiler section water-cooled wall 100 to form an upper column and lower cone structure. The semi-waste boiler gasifier body 1, the waste boiler section lower water cooler 2 and the quenching section cooling pipe 3 are coaxially arranged.

[0037] Preferably, when the inner diameter of the semi-waste boiler gasifier body 1 is 4200 mm, the inner diameter of the waste boiler section water-cooled wall 100 is 3163 mm, and the inner diameter of the quenching section cooling pipe 3 is 1800 mm; the cone surface of the waste boiler section lower slag opening 101 is inclined toward the central axis of the semi-waste boiler gasifier body 1; the angle between the cone surface of the waste boiler section lower slag opening 101 and the axial direction of the semi-waste boiler gasifier body 1 is 30°, at this time, the cone wall length of the waste boiler section lower slag opening 101 is adjusted and shortened to 1449 mm, and the inner diameter of the lower end of the waste boiler section lower water cooler 2 is 1717 mm, at this time relative to the semi-waste boiler gasifier As for the inner diameter of the furnace body 1 and the inner diameter of the waste boiler section water-cooled wall 100, the inner diameter of the lower end of the waste boiler section slag opening 101 and the inner diameter of the waste boiler section lower water cooler 2 are the largest. The conical inclined surface of the waste boiler section slag opening 101 is used to facilitate the slag to pass through the waste boiler section lower water cooler 2 and fall into the quenching section cooling pipe 3 of the quenching section. At the same time, due to the short length of the conical wall of the waste boiler section slag opening 101, the diameter of the slag channel between the waste boiler section water-cooled wall 100 and the waste boiler section lower water cooler 2 is larger, and more slag can be accommodated on the same cross section of the slag channel, which effectively reduces the accumulation of slag and effectively prevents slag blockage.

[0038] In this embodiment, the anti-blocking slag structure of the semi-waste boiler gasifier also includes a flange connector, and the waste boiler section lower water cooler 2 is connected to the quenching section cooling pipe 3 through the flange connector to ensure connection stability and sealing. The flange connector is located inside the semi-waste boiler gasifier body 1.

[0039] In this embodiment, the slag blocking prevention structure of the semi-waste boiler gasifier further includes a support plate 4 disposed between the flange connector and the inner wall of the semi-waste boiler gasifier body 1; one end of the support plate 4 is connected to the flange connector, and the other end of the support plate 4 is inclined upward from bottom to top and connected to the inner wall of the semi-waste boiler gasifier body 1. The support plate 4 supports the waste boiler section lower water cooler 2 and the quenching section cooling pipe 3 to ensure the stability of the waste boiler section lower water cooler 2 and the quenching section cooling pipe 3.

[0040] In this embodiment, the inclination angle of the support plate 4 is 10° to 20°, specifically 10°, 12°, 15°, 18° or 20°.

[0041] Preferably, the inclination angle of the support plate 4 is 15°, in which case the support provided is greater and more stable.

[0042] Example 2

[0043] See also Figure 2 and Figure 3 On the basis of Example 1, this embodiment provides a semi-waste boiler and semi-waste boiler gasification furnace anti-slag blocking structure, wherein the flange connecting part includes an inner ring part 6 and a tray flange 9 which are sequentially sleeved from the inside to the outside, and the support plate 4 is connected to the tray flange 9.

[0044] In this embodiment, the flange connector also includes an upper connecting ring plate 8 placed on the upper part of the tray flange 9 and sleeved on the outer wall of the lower water cooler 2 of the waste boiler section, and a quenching ring 12 placed on the lower part of the tray flange 9 and sleeved on the outer wall of the cooling pipe 3 of the quenching section.

[0045] In this embodiment, the outer end of the inner ring member 6 is a first step structure that is larger at the top and smaller at the bottom, and the end of the tray flange 9 connected to the inner ring member 6 is a second step structure that is smaller at the top and larger at the bottom. The first step structure and the second step structure match, and the inner ring member 6 is sleeved on the tray flange 9 to form a whole.

[0046] In this embodiment, the flange connector further includes a fastener 7; the fastener 7 passes through the quench ring 12, the tray flange 9 and the upper connecting ring plate 8 in sequence and is fastened.

[0047] Preferably, the fastener 7 is a bolt connector, and may also be replaced by other fasteners, such as screws.

[0048] In this embodiment, the inner ring member 6 and the tray flange 9 are both annular members, and there are multiple fasteners 7 , which are evenly distributed in the radial direction of the tray flange 9 .

[0049] During implementation, the number of the fasteners 7 is two, three, four or more.

[0050] In this embodiment, sealing members are provided on both the upper surface of the flange connection member and the lower surface of the flange connection member.

[0051] Preferably, the seal includes a toothed combination gasket 10 and a ceramic fiber layer 11; a toothed combination gasket 10 is respectively arranged on the upper surface of the pallet flange 9 and the lower surface of the pallet flange 9, so that the upper connecting ring plate 8, the toothed combination gasket 10, the pallet flange 9, the toothed combination gasket 10 and the quenching ring 12 are stacked in sequence from top to bottom, and then pass through the above components in sequence from bottom to top and fasten them into a whole; by arranging a layer of toothed combination gasket 10 between the upper connecting ring plate 8 and the pallet flange 9 and between the pallet flange 9 and the quenching ring 12, the tightness is improved to prevent steam leakage.

[0052] Preferably, the ceramic fiber layer 11 is arranged on the upper surface and the lower surface of the inner ring 6, that is, one layer is arranged between the upper connecting ring plate 8 and the inner ring 6 and between the inner ring 6 and the quenching ring 12. The ceramic fiber layer 11 has the advantages of high temperature resistance, good thermal stability, low thermal conductivity and mechanical vibration resistance. When the pallet flange 9 and the inner ring 6 are clamped, the toothed composite pad 10 and the ceramic fiber layer 11 are in contact.

[0053] Preferably, the thickness of the toothed composite pad 10 is 6 mm, the thickness of the ceramic fiber layer 11 is 6 mm; the height of the upper connecting ring plate 8 and the height of the quenching ring 12 are both 30 mm.

[0054] See also Figure 2 and Figure 3 In this embodiment, the slag blocking prevention structure of the semi-waste boiler gasifier also includes a water inlet pipe 5 located between the quenching section cooling pipe 3 and the semi-waste boiler gasifier body 1; one end of the water inlet pipe 5 extends to the outside of the semi-waste boiler gasifier body 1, and the other end of the water inlet pipe 5 is connected to the inside of the quenching section cooling pipe 3.

[0055] In this embodiment, there are two water inlet pipes 5 , which are symmetrically distributed about the axial direction of the cooling pipe 3 of the quenching section.

[0056] Preferably, the water inlet pipe 5 is formed by connecting a first water inlet pipe and a second water inlet pipe, the first water inlet pipe is placed in a vertical direction, and the angle between the axial direction of the second water inlet pipe and the axial direction of the first water inlet pipe is 145°. When connected, the first water inlet pipe and the second water inlet pipe are both located between the quenching section cooling pipe 3 and the semi-waste boiler gasifier body 1, and the axial direction of the first water inlet pipe is the same as the axial direction of the quenching section cooling pipe 3, the second water inlet pipe is close to the quenching section cooling pipe 3, the lower end of the first water inlet pipe extends to the outside of the semi-waste boiler gasifier body 1, and is connected with the cooling water, the upper end of the first water inlet pipe is connected with the inside of the quenching section cooling pipe 3 through the second water inlet pipe, and the cooling water is passed into the quenching section cooling pipe 3, and the fallen ash is washed so that it is discharged from the lower end of the quenching section to the semi-waste boiler gasifier body 1.

[0057] Example 3

[0058] The purpose of this embodiment is to utilize the anti-slag blocking structure of the semi-waste boiler gasifier provided in Example 2 to arrange the gasifier body, thereby achieving the purpose of anti-slag blocking.

[0059] The method for preventing slag blocking in a gasifier provided in this embodiment comprises the following steps:

[0060] S1. According to the slag blocking prevention structure of the semi-waste boiler gasifier in Example 2, the cone wall length of the waste boiler section lower slag opening 101 in the semi-waste boiler gasifier body 1 is adjusted according to the inclination angle of the waste boiler section lower slag opening 101, so that the ratio of the cone wall length of the waste boiler section lower slag opening 101 to the inner diameter of the semi-waste boiler gasifier body 1 is 0.345:1, and the inner diameter of the waste boiler section lower water cooler 2 is maintained at 0.4074 to 0.4088 times the inner diameter of the semi-waste boiler gasifier body 1.

[0061] Preferably, when the inclination angle of the waste boiler section lower slag opening 101 is 30°, the length of the cone wall of the waste boiler section lower slag opening 101 is shortened so that the ratio of the cone wall length of the waste boiler section lower slag opening 101 to the inner diameter of the semi-waste boiler gasifier body 1 is 0.345:1.

[0062] S2. The ash from the waste boiler section in the semi-waste boiler gasifier body 1 flows downward continuously along the conical wall of the waste boiler section lower slag opening 101, and enters the quenching section cooling pipe 3 through the waste boiler section lower water cooler 2 with a larger inner diameter, which can reduce slag blockage; at the same time, cooling water is introduced into the quenching section cooling pipe 3 to wash the ash, ensuring that the ash is discharged from the bottom of the semi-waste boiler gasifier body 1.

[0063] In this embodiment, according to the inclination angle of the waste boiler section slag opening 101, the cone wall length of the waste boiler section slag opening 101 in the semi-waste boiler gasifier body 1 is adjusted, specifically, the length of the cone surface of the waste boiler section slag opening 101 is shortened, so that the inner diameters of the waste boiler section slag opening 101 and the waste boiler section lower water cooler 2 are maintained within a larger size range. At this time, relative to the inner diameter of the semi-waste boiler gasifier body 1, the inner diameter of the slag channel between the waste boiler section slag opening 101 and the waste boiler section lower water cooler 2 is larger, and slag blockage is not easy to occur when the ash flows to the quenching section cooling pipe 3; and the inner diameter of the slag channel is larger, the water gas flow rate is slower, the reaction time of the high-temperature coal gas and water is prolonged, and the carbon-hydrogen ratio can be improved, which is beneficial to the subsequent conversion reaction.

[0064] Preferably, when the inner diameter of the semi-waste boiler gasifier body 1 is 4200mm, the angle between the conical surface of the waste boiler section slag outlet 101 and the axial direction of the semi-waste boiler gasifier body 1 is 30°, the cone wall length of the waste boiler section slag outlet 101 is 1449mm, and the inner diameter of the quenching section cooling tube 3 is 1800mm, the inner diameter of the waste boiler section lower water cooler 2 is 1717mm, and the slag channel is not easily blocked, which reduces the number of shutdowns for maintenance and reduces costs.

[0065] In this embodiment, when the water-gas flow rate is slow, the cooling water will enter the cooling tube 3 of the quenching section, and the gas and water will undergo a shift reaction to produce a large amount of hydrogen, increasing the hydrogen-carbon ratio, which is beneficial to the subsequent shift reaction.

[0066] In this embodiment, cooling water is introduced into the quenching section cooling pipe 3 through the water inlet pipe 5 connected to the quenching section cooling pipe 3. The specific structure and installation layout of the water inlet pipe 5 refer to Example 2.

[0067] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention.

Claims

1. A slag blocking prevention structure for a semi-waste boiler gasifier, characterized in that: The invention comprises a waste boiler section slag opening (101), a waste boiler section lower water cooler (2) and a quenching section cooling pipe (3) which are connected in sequence from top to bottom; the waste boiler section slag opening (101) is a tubular structure with an inverted cone in longitudinal section; the length of the cone wall of the waste boiler section slag opening (101) is adjusted according to the inclination angle of the waste boiler section slag opening (101), and the inner diameter of the waste boiler section lower water cooler (2) is maintained at 0.4074 to 0.4088 times the inner diameter of the semi-waste boiler gasification furnace body (1), thereby reducing the slag blocking phenomenon of the waste boiler section slag opening (101) and the waste boiler section lower water cooler (2).

2. The anti-slag blocking structure of the semi-waste boiler gasification furnace according to claim 1 is characterized in that: The inclination angle of the waste boiler section lower slag opening (101) is 30°. At this time, the length of the cone wall of the waste boiler section lower slag opening (101) is shortened, so that the ratio of the cone wall length of the waste boiler section lower slag opening (101) to the inner diameter of the semi-waste boiler gasification furnace body (1) is 0.345:

1.

3. The anti-slag blocking structure of the semi-waste boiler gasifier according to claim 1 is characterized in that: The semi-waste boiler gasification furnace slag blocking prevention structure also includes a flange connector, and the waste boiler section lower water cooler (2) is connected to the quenching section cooling pipe (3) through the flange connector.

4. The anti-slag blocking structure of the semi-waste boiler gasification furnace according to claim 3 is characterized in that: The semi-waste boiler gasifier anti-slag blocking structure also includes a support plate (4) arranged between the flange connection piece and the inner wall of the semi-waste boiler gasifier body (1); one end of the support plate (4) is connected to the flange connection piece, and the other end of the support plate (4) is inclined from bottom to top and connected to the inner wall of the semi-waste boiler gasifier body (1); the inclination angle of the support plate (4) is 10° to 20°.

5. The anti-slag blocking structure of the semi-waste boiler gasification furnace according to claim 4 is characterized in that: The flange connection part comprises an inner ring part (6) and a tray flange (9) which are sleeved in sequence from the inside to the outside; the support plate (4) is connected to the tray flange (9).

6. The anti-slag blocking structure of the semi-waste boiler gasification furnace according to claim 5 is characterized in that: The flange connection also includes an upper connection ring plate (8), a quenching ring (12) and a fastener (7); the upper connection ring plate (8) is located at the upper part of the tray flange (9) and is sleeved on the outer wall of the lower water cooler (2) of the waste boiler section; the quenching ring (12) is located at the lower part of the tray flange (9) and is sleeved on the outer wall of the cooling pipe (3) of the quenching section, and the fastener (7) passes through the quenching ring (12), the tray flange (9) and the upper connection ring plate (8) in sequence and is fastened.

7. The slag blocking prevention structure of the semi-waste boiler gasification furnace according to claim 6 is characterized in that: There are a plurality of fasteners (7), and the plurality of fasteners (7) are evenly distributed in the radial direction of the tray flange (9).

8. A method for preventing slag blocking in a gasifier based on the anti-slag blocking structure for a semi-waste boiler gasifier according to claim 6, characterized in that: The following steps are involved: S1. According to the anti-blocking slag structure of the semi-waste boiler gasifier, the length of the cone wall of the waste boiler section slag opening (101) in the semi-waste boiler gasifier body (1) is adjusted according to the inclination angle of the waste boiler section slag opening (101), so that the ratio of the cone wall length of the waste boiler section slag opening (101) to the inner diameter of the semi-waste boiler gasifier body (1) is 0.345:1, and the inner diameter of the waste boiler section lower water cooler (2) is maintained at 0.4074 to 0.4088 times the inner diameter of the semi-waste boiler gasifier body (1); S2. The ash from the waste boiler section in the semi-waste boiler gasification furnace body (1) flows downward continuously along the conical wall of the waste boiler section lower slag opening (101), and enters the quenching section cooling pipe (3) through the waste boiler section lower water cooler (2) with a larger inner diameter, thereby reducing slag blockage; at the same time, cooling water is introduced into the quenching section cooling pipe (3) to wash the ash, thereby ensuring that the ash is discharged from the bottom of the semi-waste boiler gasification furnace body (1).

9. The method for preventing slag blocking in a gasifier of the semi-waste boiler gasifier slag blocking prevention structure according to claim 8, characterized in that: Cooling water is introduced into the quenching section cooling pipe (3) through a water inlet pipe (5) connected to the quenching section cooling pipe (3).

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