Water-cooled ash bucket device with built-in slag solidification pipe

Abstract

The water-cooled ash bucket device with the built-in slag solidification pipe comprises a water-cooled ash bucket front wall, a water-cooled ash bucket rear wall, a water-cooled ash bucket left side wall, a water-cooled ash bucket right side wall and a bottom slag discharging opening, and the bottom slag discharging opening is connected with a spiral ash conveying machine through a flange. The water-cooled ash bucket front wall, the water-cooled ash bucket rear wall, the water-cooled ash bucket left side wall and the water-cooled ash bucket right side wall are all composed of a plurality of water-cooled pipes and flat steel; at least one layer of slag solidifying pipe is arranged on the bottom slag discharging opening, and the slag solidifying pipe is communicated with a water-cooled pipe on the front wall of the water-cooled ash bucket or is communicated with a water-cooled pipe on the rear wall of the water-cooled ash bucket and a rear wall lower collecting box. The water-cooled ash bucket is internally provided with a slag solidification pipe structure, so that the temperature of ash in a high-temperature area is reduced, fly ash and a flue gas flow field in the ash bucket are optimized, smoke dust in high-temperature flue gas is further settled and separated, and the ash deposition risk of the ash bucket and a convection heating surface on the rear side of a flue gas flow is reduced; meanwhile, the slag solidification pipe is arranged, ash is further cooled, the waste heat of ash slag is fully utilized, the slag discharging heat loss is reduced, and then the heat energy recycling efficiency of the boiler is improved.

Description

Technical Field

[0001] The utility model relates to the field of organic solid waste incineration boilers, in particular to a water-cooled ash hopper device with a built-in slag condensing pipe. Background Art

[0002] In recent years, the use of high-temperature incineration to treat organic solid waste such as urban domestic garbage, agricultural and forestry waste, and energy recovery at the same time can achieve the resource utilization, reduction, and harmlessness of organic solid waste. Generally, organic solid waste treated by high-temperature incineration can reduce weight by 80% and volume by more than 90%. The heat energy generated by the combustion of organic solid waste can be converted into steam for heating or power generation. This is the biggest source of the resource utilization benefits of incineration treatment. As a device for such heat recovery and conversion, the organic solid waste incineration boiler plays a key role in this waste heat recovery process. How to make the organic solid waste incineration boiler operate stably, safely, and economically for a long time is particularly important.

[0003] The high-temperature flue gas generated by the incineration of organic solid waste in the incinerator contains a lot of corrosive substances. These substances adhere to the fly ash particles in the flue gas under high temperature, which causes the fly ash characteristics to change and the melting point to decrease, resulting in serious ash accumulation and coking and agglomeration in the stagnant area of ​​the boiler flue gas. For boilers with a three-flue structure of the water-cooled wall, the ash hoppers at the bottom of the second and third flues are prone to uneven flue gas turning flow fields and poor heat exchange effects. Large coke blocks fall vertically and damage the ash hopper and the ash conveyor below it, often causing ash conveying to stagnate, which seriously threatens the safe operation of the boiler.

[0004] Therefore, the organic solid waste incineration boiler in the prior art urgently needs a device that can reduce the flue gas fly ash temperature as much as possible, optimize the flue gas flow field, and at the same time protect the ash hopper and slag discharge device of the ash conveyor. Utility Model Content

[0005] The utility model discloses a water-cooled ash hopper device with a built-in slag condensing pipe, which is used to solve relevant technical problems in the background technology.

[0006] The technical solution provided by the utility model is as follows: a water-cooled ash hopper device with a built-in slag condensing pipe, comprising: a water-cooled ash hopper front wall, a water-cooled ash hopper rear wall, a water-cooled ash hopper left wall, a water-cooled ash hopper right wall and a bottom slag discharge port, wherein the bottom slag discharge port is connected to a spiral ash conveyor through a flange;

[0007] The front wall, rear wall, left wall and right wall of the water-cooled ash hopper are all composed of a plurality of water-cooled pipes and flat steels, and adjacent water-cooled pipes are connected by flat steels.

[0008] The front wall of the water-cooled ash hopper is connected to the header under the front wall, the rear wall of the water-cooled ash hopper is connected to the header under the rear wall, the left wall of the water-cooled ash hopper is connected to the header under the left wall, and the right wall of the water-cooled ash hopper is connected to the header under the right wall;

[0009] At least one layer of slag condensation pipes is arranged on the bottom slag discharge port, and the slag condensation pipes are connected to the water cooling pipes on the front wall of the water cooling ash hopper or to the water cooling pipes on the rear wall of the water cooling ash hopper and the lower header of the rear wall.

[0010] In some embodiments, the left wall and the right wall of the water-cooled ash hopper are arranged vertically, and the front wall and the rear wall of the water-cooled ash hopper are inclined inward; the bottom end of the front wall of the water-cooled ash hopper is lower than the bottom end of the rear wall of the water-cooled ash hopper, and the slag condensation pipe is an inclined side-outlet structure.

[0011] In some implementations, the angle between the front wall of the water-cooled ash hopper and the horizontal line is θ1, 55°≤θ1≤60°.

[0012] In some implementations, the angle between the rear wall of the water-cooled ash hopper and the horizontal line is θ2, 50°≤θ2≤55°.

[0013] In some embodiments, the angle between the center line of the bottom slag discharge port and the vertical line is θ3, 55°≤θ3≤60°.

[0014] In some implementations, the spiral ash conveyor is offset, and the extension line of θ1 is tangent to the outer diameter of the blades of the spiral ash conveyor.

[0015] In some embodiments, the front wall of the water-cooled ash hopper is connected to the front wall lower header, the rear wall of the water-cooled ash hopper is connected to the rear wall lower header, the left wall of the water-cooled ash hopper is connected to the left wall lower header, and the right wall of the water-cooled ash hopper is connected to the right wall lower header.

[0016] In some implementations, the elevation of the header under the front wall is lower than the elevation of the header under the rear wall.

[0017] In some embodiments, the slag condensation pipe is a U-shaped structure; when the slag condensation pipe is connected to the water-cooling pipe of the front wall of the water-cooled ash hopper or to the water-cooling pipe of the rear wall of the water-cooled ash hopper and the lower collecting box of the rear wall, the U-shaped elbow of the slag condensation pipe is connected to the sealing filling block on the front wall of the water-cooled ash hopper or the rear wall of the water-cooled ash hopper on the other side through a connecting plate.

[0018] In some embodiments, the slag condensation pipe is double-layered, one layer is the front wall slag condensation pipe, which is connected to the water-cooling pipe on the front wall of the water-cooled ash hopper, and the other layer is the rear wall slag condensation pipe, which is connected to the water-cooling pipe on the rear wall of the water-cooled ash hopper and the rear wall lower header.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] (1) The utility model has a slag coagulating pipe structure in the water-cooled ash hopper, which reduces the temperature of the ash in the high-temperature zone, optimizes the flow field of fly ash and flue gas in the ash hopper, further settles and separates the smoke in the high-temperature flue gas, and reduces the risk of ash accumulation in the ash hopper and the convection heating surface at the rear side of the flue gas flow. At the same time, a slag coagulating pipe is arranged at the outlet of the water-cooled ash hopper to further cool the ash, make full use of the waste heat of the ash, reduce the heat loss of slag discharge, and thus improve the efficiency of boiler heat recovery.

[0021] (2) The water-cooled ash hopper of the utility model utilizes the structural layout feature that the bottom of the front wall of the water-cooled ash hopper is lower than the bottom of the rear wall of the water-cooled ash hopper, and designs the bottom slag discharge port as an inclined side-out structure, thereby avoiding the impact of larger coke blocks falling vertically due to gravity on the ash conveying device at the bottom of the ash hopper, effectively protecting the safe operation of the spiral ash conveyor and extending its service life.

[0022] (3) The water-cooled ash hopper of the utility model avoids direct radiation of the high-temperature flue gas in the furnace to the ash conveying device through the offset setting of the spiral ash conveyor, which significantly improves the mechanical performance of the ash conveying device; the extension line of the inclination angle θ1 of the front wall of the water-cooled ash hopper is set tangent to the outer diameter of the spiral blade, which can maximize the design of the inlet and outlet channels of the adiabatic inclined slag discharge port to ensure smooth ash discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the installation structure of the water-cooled ash hopper and boiler of the utility model;

[0024] Figure 2 This utility model Figure 1 A partial enlarged view of point Ⅰ in the middle;

[0025] Figure 3 This utility model Figure 1 Middle AA section view;

[0026] Figure 4 This is a schematic diagram of the connection structure of the slag-condensing pipe in the utility model;

[0027] Figure 5 This utility model Figure 4 Middle BB section view;

[0028] Figure 6 It is a schematic diagram of the specific structure of the front wall of the water-cooled ash hopper, the rear wall of the water-cooled ash hopper, the left wall of the water-cooled ash hopper and the right wall of the water-cooled ash hopper in the embodiment of the utility model.

[0029] The accompanying drawings are marked as follows: 1. front wall of water-cooled ash hopper; 2. rear wall of water-cooled ash hopper; 3. left wall of water-cooled ash hopper; 4. right wall of water-cooled ash hopper; 5. bottom slag discharge port; 6. spiral ash conveyor; 7. first flue; 8. second flue; 9. third flue; 10. slag condensation pipe on the front wall; 11. header box under the front wall; 12. slag condensation pipe on the rear wall; 13. header box under the rear wall; 14. header box under the left wall; 15. header box under the right wall; 16. outer diameter of spiral ash conveyor blades; 17. extension line of inclination angle θ1 of the front wall of water-cooled ash hopper; 18. connecting plate; 19. sealing filling block; 20. water-cooling pipe; 21. flat steel; 22. flange. DETAILED DESCRIPTION

[0030] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0031] Example 1

[0032] like Figure 1-6 As shown, the utility model is a water-cooled ash hopper device with a built-in slag condensing pipe, comprising: a water-cooled ash hopper front wall 1, a water-cooled ash hopper rear wall 2, a water-cooled ash hopper left wall 3 and a water-cooled ash hopper right wall 4. The water-cooled ash hopper front wall 1, the water-cooled ash hopper rear wall 2, the water-cooled ash hopper left wall 3 and the water-cooled ash hopper right wall 4 are at the bottom of the second and third flues of the boiler, enclosing a water-cooled ash hopper, which is applied to the bottom of the second and third flues of the waste heat boiler for incineration of domestic waste, and can be used as a settling chamber to separate and collect most of the fly ash in the high-temperature flue gas by utilizing the inertia of the flue gas diversion and the lower turning flow rate; Figure 6 As shown, the front wall 1 of the water-cooled ash hopper, the rear wall 2 of the water-cooled ash hopper, the left wall 3 of the water-cooled ash hopper and the right wall 4 of the water-cooled ash hopper are all composed of a plurality of water-cooling pipes 20 and flat steels 21, and the water-cooling pipes 20 and the flat steels 21 are connected at intervals; the bottom of the water-cooled ash hopper is provided with a bottom slag discharge port 5, and the bottom slag discharge port 5 is connected to a spiral ash conveyor 6 through a flange 22; at least one layer of slag condensing pipes is arranged on the bottom slag discharge port 5, and the slag condensing pipes are connected to the water-cooling pipes 20 of the front wall 1 of the water-cooled ash hopper or to the water-cooling pipes 20 of the rear wall 2 of the water-cooled ash hopper; by setting up a slag condensing pipe structure, the temperature of the ash in the high-temperature zone is reduced, the fly ash and flue gas flow field in the ash hopper is optimized, the smoke dust in the high-temperature flue gas is further settled and separated, and the risk of ash accumulation in the ash hopper and the convection heating surface at the rear side of the flue gas process is reduced; at the same time, a slag condensing pipe is arranged at the outlet of the water-cooled ash hopper to further cool the ash, make full use of the waste heat of the ash, reduce the heat loss of slag discharge, and thus improve the efficiency of boiler heat recovery. Specifically:

[0033] In this embodiment, the front wall 1 of the water-cooled ash hopper is connected to the front wall lower header 11, the rear wall 2 of the water-cooled ash hopper is connected to the rear wall lower header 13, the left wall 3 of the water-cooled ash hopper is connected to the left wall lower header 14, and the right wall 4 of the water-cooled ash hopper is connected to the right wall lower header 15. The front wall lower header 11, the rear wall lower header 13, the left wall lower header 14 and the right wall lower header 15 of this embodiment supply liquid to the front wall 1 of the water-cooled ash hopper, the rear wall 2 of the water-cooled ash hopper, the left wall 3 of the water-cooled ash hopper and the right wall 4 of the water-cooled ash hopper respectively.

[0034] In this embodiment, the slag condensation pipe is a U-shaped structure; the slag condensation pipe has a transverse pitch L1 = 400 ~ 800mm and a longitudinal intercept L2 = 200 ~ 500mm, which are evenly distributed at the lower outlet of the water-cooled ash hopper; the appropriate pitch can be selected according to different pipe diameters to ensure smooth discharge of ash; it can also be adjusted to a single-layer or double-layer arrangement structure according to the different ash characteristics generated by changes in the type of organic solid waste fuel.

[0035] In the present embodiment, the slag condensation pipe has a double-layer structure, one layer is the front wall slag condensation pipe 10, which is connected to the water-cooling pipe 20 of the front wall 1 of the water-cooled ash hopper, and the other layer is the rear wall slag condensation pipe 12, which is connected to the water-cooling pipe 20 of the rear wall 2 of the water-cooled ash hopper; the front wall slag condensation pipe 10 is connected to the water-cooling pipe 20 of the front wall 1 of the water-cooled ash hopper, and is connected to the sealing filling block 19 on the rear wall 2 of the water-cooled ash hopper at the U-shaped elbow; the rear wall slag condensation pipe 12 is connected to the water-cooling pipe 20 of the rear wall 2 of the water-cooled ash hopper and the rear wall lower collecting box 13, and is connected to the sealing filling block 19 on the front wall 1 of the water-cooled ash hopper at the U-shaped elbow; in the present embodiment, the slag condensation pipe is connected to the sealing filling block 19, which can enhance the strength and rigidity of the slag condensation pipe.

[0036] Example 2

[0037] This embodiment 2 is formed on the basis of embodiment 1. By designing the bottom slag discharge port 5 as an inclined side-discharge structure, the impact of larger coke blocks falling vertically due to gravity on the ash conveying device below the ash hopper is avoided, effectively protecting the safe operation of the spiral ash conveyor 6 and extending its service life.

[0038] In this embodiment, Figure 1 As shown in or 2, the left wall 3 and the right wall 4 of the water-cooled ash hopper are arranged vertically, and the front wall 1 and the rear wall 2 of the water-cooled ash hopper are inclined inwards; the bottom of the front wall 1 of the water-cooled ash hopper is designed to be lower than the bottom of the rear wall 2 of the water-cooled ash hopper, and the bottom slag outlet 5 is an angled side-out type; taking advantage of the structural layout characteristics that the bottom of the front wall 1 of the water-cooled ash hopper is lower than the bottom of the rear wall 2 of the water-cooled ash hopper, the bottom slag outlet 5 is designed to be an angled side-out type structure, which avoids the impact of larger coke blocks falling vertically due to gravity on the ash conveying device at the bottom of the ash hopper, effectively protects the safe operation of the spiral ash conveyor 6, and extends its service life. Specifically:

[0039] As shown in the figure, the elevation of the front wall lower header 11 is lower than that of the rear wall lower header 13 by 1000mm≤L3≤1200mm; in this embodiment, L3=1000mm. By utilizing the structural arrangement feature that the elevation of the front wall lower header 11 is lower than that of the rear wall lower header 13, the structural design that the bottom of the water-cooled ash hopper front wall 1 is lower than the bottom of the water-cooled ash hopper rear wall 2 is achieved, thereby achieving the purpose of the bottom slag discharge port 5 being an inclined side-out type, thereby avoiding the impact of large coke blocks falling vertically due to gravity on the ash conveying device at the bottom of the ash hopper, effectively protecting the safe operation of the spiral ash conveyor 6, and extending the service life.

[0040] The angle between the front wall 1 of the water-cooled ash hopper and the horizontal line is θ1, 55°≤θ1≤60°, the angle between the rear wall 2 of the water-cooled ash hopper and the horizontal line is θ2, 50°≤θ2≤55°, and the angle between the center line of the bottom slag discharge port 5 and the vertical line is θ3, 55°≤θ3≤60°; in this embodiment, the angle θ1 between the front wall 1 of the water-cooled ash hopper and the horizontal line is preferably 55°; the angle θ2 between the rear wall 2 of the water-cooled ash hopper and the horizontal line is preferably 50°.

[0041] In this embodiment, the bottom slag discharge port 5 is welded by a 9mm thick steel plate and a folded plate to form a sealed cavity, and the angle θ3 between the center line and the vertical line is 60°, thereby realizing the offset setting of the spiral ash conveyor 6, avoiding the direct radiation of the high-temperature flue gas in the furnace to the spiral ash conveyor 6, and significantly improving the mechanical properties of the spiral ash conveyor 6. At the same time, the extension line of the inclination angle θ1 of the front wall 1 of the water-cooled ash hopper is tangent to the outer diameter of the blade of the spiral ash conveyor 6, which can maximize the design of the adiabatic inclined slag discharge port channel to ensure smooth ash discharge.

[0042] The working principle of the utility model is as follows: after the fly ash is cooled and settled by the front wall 1, the rear wall 2, the left wall 3 and the right wall 4 of the water-cooled ash hopper, it is further cooled by the slag coagulation pipe and enters the inclined side-discharge bottom slag outlet 5 to be output by the spiral ash conveyor 6; the water-cooled ash hopper of the utility model has a slag coagulation pipe structure to reduce the temperature of the ash in the high-temperature zone, optimize the fly ash and flue gas flow field in the ash hopper, further settle and separate the smoke in the high-temperature flue gas, and reduce the risk of ash accumulation in the ash hopper and the convection heating surface at the rear side of the flue gas process; a slag coagulation pipe is arranged at the outlet of the water-cooled ash hopper to further reduce the temperature of the ash in the high-temperature zone, make full use of the waste heat of the ash, reduce the heat loss of slag discharge, and thus improve the efficiency of heat recovery of the boiler, while avoiding the direct fall of larger coke blocks in the second flue 8 to damage the spiral ash conveyor 6 at the bottom of the ash hopper.

[0043] In this application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0044] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A water-cooled ash hopper device with a built-in slag condensation pipe, characterized in that: include: A water-cooled ash hopper front wall (1), a water-cooled ash hopper rear wall (2), a water-cooled ash hopper left wall (3), a water-cooled ash hopper right wall (4) and a bottom slag discharge port (5), wherein the bottom slag discharge port (5) is connected to a screw ash conveyor (6) via a flange (22); The water-cooled ash hopper front wall (1), the water-cooled ash hopper rear wall (2), the water-cooled ash hopper left wall (3) and the water-cooled ash hopper right wall (4) are all composed of a plurality of water-cooled pipes (20) and flat steels (21), and adjacent water-cooled pipes (20) are connected via the flat steels (21); The front wall (1) of the water-cooled ash hopper is connected to the front wall lower header (11), the rear wall (2) of the water-cooled ash hopper is connected to the rear wall lower header (13), the left side wall (3) of the water-cooled ash hopper is connected to the left side wall lower header (14), and the right side wall (4) of the water-cooled ash hopper is connected to the right side wall lower header (15); At least one layer of slag condensation pipes is arranged on the bottom slag discharge port (5), and the slag condensation pipes are connected to the water cooling pipes (20) of the front wall (1) of the water-cooled ash hopper or to the water cooling pipes (20) of the rear wall (2) of the water-cooled ash hopper and the rear wall lower header (13).

2. A water-cooled ash hopper device with a built-in slag condensation pipe as claimed in claim 1, characterized in that: The left side wall (3) of the water-cooled ash hopper and the right side wall (4) of the water-cooled ash hopper are both arranged vertically, and the front wall (1) of the water-cooled ash hopper and the rear wall (2) of the water-cooled ash hopper are both inclined inwardly; the bottom end of the front wall (1) of the water-cooled ash hopper is lower than the bottom end of the rear wall (2) of the water-cooled ash hopper, and the bottom slag discharge port (5) is an inclined side-outlet structure.

3. A water-cooled ash hopper device with a built-in slag condensation pipe as claimed in claim 2, characterized in that: The angle between the front wall (1) of the water-cooled ash hopper and the horizontal line is θ1, 55°≤θ1≤60°.

4. A water-cooled ash hopper device with a built-in slag condensation pipe as claimed in claim 2, characterized in that: The angle between the rear wall (2) of the water-cooled ash hopper and the horizontal line is θ2, 50°≤θ2≤55°.

5. The water-cooled ash hopper device with a built-in slag condensation pipe as claimed in claim 3, characterized in that: The angle between the center line of the bottom slag discharge port (5) and the vertical line is θ3, 55°≤θ3≤60°.

6. A water-cooled ash hopper device with a built-in slag condensation pipe as claimed in claim 5, characterized in that: The spiral ash conveyor (6) is offset, and the extension line of θ1 is tangent to the outer diameter of the blades of the spiral ash conveyor (6).

7. The water-cooled ash hopper device with a built-in slag coagulation pipe according to claim 1, characterized in that: The elevation of the front wall lower header (11) is lower than the elevation of the rear wall lower header (13).

8. The water-cooled ash hopper device with a built-in slag coagulation pipe as claimed in claim 1, characterized in that: The slag condensation pipe is a U-shaped structure; when the slag condensation pipe is connected to the water-cooling pipe (20) of the front wall (1) of the water-cooled ash hopper or is connected to the water-cooling pipe (20) of the rear wall (2) of the water-cooled ash hopper and the lower header (13) of the rear wall, the U-shaped elbow of the slag condensation pipe is connected to the sealing filling block (19) on the front wall (1) of the water-cooled ash hopper or the rear wall (2) of the water-cooled ash hopper on the other side through a connecting plate (18).

9. The water-cooled ash hopper device with a built-in slag condensation pipe as claimed in claim 1, characterized in that: The slag condensation pipe is double-layered, one layer is a front wall slag condensation pipe (10), which is connected to the water cooling pipe (20) of the front wall (1) of the water cooling hopper, and the other layer is a rear wall slag condensation pipe (12), which is connected to the water cooling pipe (20) of the rear wall (2) of the water cooling hopper and the rear wall lower header (13).

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