Anti-bonding ash discharging device

Abstract

The invention discloses an anti-bonding ash discharging device which can be arranged at the lower part of an ash hopper, and the ash hopper comprises a conical hopper and an ash falling pipe which are connected up and down. The ash discharging device comprises a spiral inner cylinder which is arranged in a gradually expanding manner from bottom to top, the spiral inner cylinder can be arranged close to the inner wall of the ash hopper, and the spiral inner cylinder is of a spiral blade structure or a spiral structure; the magnetic bearing system is arranged at the middle lower part of the ash falling pipe; and the spiral inner cylinder can rotate under the driving of the magnetic bearing system. The sealing device has the advantages of being simple in structure, not prone to deformation, capable of guaranteeing sealing performance when applied to the ash bucket, smooth in ash falling and the like.

Description

Technical Field

[0001] The invention relates to an anti-adhesion ash removal device, and relates to the technical fields of biomass and solid waste gasification and combustion. Background Art

[0002] When biomass or domestic waste is burned or gasified as fuel, it often has the characteristics of complex composition, low calorific value, high moisture content, low bulk density, high volatile components and high alkali metal content. Correspondingly, the ash produced by domestic waste, industrial combustible waste, hazardous waste and biomass during combustion or gasification usually has a porous and fluffy state with low true density and strong adhesion, which can easily cause blockage in various ash hoppers, including the ash hopper under the separator of the fluidized bed, the ash hopper connecting the second and third channels of the grate furnace, and the ash hopper under the shaft at the tail of various furnace types. Summary of the invention

[0003] The invention aims to provide an anti-adhesion ash removal device, which achieves the purpose of scraping ash and preventing adhesion by installing a spiral inner cylinder in an ash hopper to form relative movement.

[0004] The present invention is achieved through the following technical solutions.

[0005] According to one embodiment, the present invention provides an anti-sticking ash discharge device, which can be arranged at the lower part of the ash hopper, the ash hopper is funnel-shaped, including a cone hopper arranged at the upper part and a cylindrical ash drop pipe connected to the bottom of the cone hopper, including: The spiral inner cylinder can be arranged close to the inner wall of the ash hopper, and its shape corresponds to the shape of the ash hopper, and is arranged in a gradually expanding shape from bottom to top; the spiral inner cylinder adopts a spiral blade structure or a spiral structure; A magnetic bearing system is arranged in the lower middle part of the ash falling pipe, and the spiral inner cylinder can rotate under the drive of the magnetic bearing system.

[0006] In the above technical solution, an ash spraying ring pipe is arranged on the top of the ash falling pipe, and 2-4 nozzles are arranged on the ash spraying ring pipe. The nozzles are evenly arranged around the ash falling pipe and can spray loose air into the ash hopper.

[0007] In the above technical solution, the nozzle is connected to the ash falling pipe through a loose air duct, and the loose air duct is arranged horizontally or upwardly, and the upward inclination angle β≤30°.

[0008] In the above technical solution, when the spiral inner cylinder adopts a spiral blade structure, the spiral inner cylinder is mainly composed of a plurality of spiral shaftless blades.

[0009] In the above technical solution, the magnetic bearing system includes a rotor arranged in the ash hopper and a drive motor and a controller arranged outside the ash hopper.

[0010] Compared with the prior art, the present invention has the following advantages and beneficial effects: The structure is simple and easy to implement; it is not easy to deform when used in medium and high temperature ash hoppers; the use of magnetic bearings ensures good airtightness in the ash drop pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the ash discharge device involved in the present invention.

[0012] Figure 2 It is a schematic diagram of the setting of the loose air duct involved in the present invention.

[0013] Among them, 1-cone bucket, 2-ash dropping pipe, 3-spiral inner cylinder, 4-magnetic bearing system, 5-ash spraying ring pipe. DETAILED DESCRIPTION

[0014] The specific implementation and working process of the present invention are further described below in conjunction with the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0015] The terms such as top, bottom, left, right, front and back in this application document are based on the positional relationships shown in the accompanying drawings. If the accompanying drawings are different, the corresponding positional relationships may also change accordingly, so this cannot be understood as a limitation on the scope of protection. In the description of the following embodiments, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0016] During the combustion of biomass and combustible solid waste, high-temperature fine ash will be produced at the bottom of the separator (including inertial separator, cyclone separator, and even economizer, etc.). Due to the high alkali metal content in the ash, alkali metal oxides or sulfides tend to make the fine ash structure dense and highly adhesive.

[0017] like Figure 1 As shown, the present invention provides an anti-adhesion ash discharge device, which can be arranged at the lower part of the ash hopper. The ash hopper is funnel-shaped, including a cone hopper and an ash drop pipe connected to the upper and lower parts, that is, a cone hopper arranged at the upper part and a cylindrical ash drop pipe connected to the bottom of the cone hopper.

[0018] The ash discharge device comprises a spiral inner cylinder 3. Corresponding to the shape of the ash hopper, the spiral inner cylinder 3 is arranged in the ash hopper in a gradually expanding shape from bottom to top and is arranged close to the inner wall of the ash hopper.

[0019] The spiral inner cylinder 3 is selected to have a spiral blade structure or a spiral structure, and is arranged as a shaftless spiral structure. When the spiral inner cylinder is selected to have a spiral blade structure, the spiral inner cylinder is mainly composed of a plurality of spiral shaftless blades. Preferably, the spiral blade structure is drawn from a heat-resistant steel sheet. Similarly, the spiral material is also selected from heat-resistant steel.

[0020] It also includes a magnetic bearing system 4 arranged in the middle and lower part of the ash falling pipe, and the magnetic bearing system 4 mainly includes a controller, a rotor, an electromagnet, a sensor, a power amplifier, a drive motor, etc. The spiral inner cylinder is fixedly arranged on the rotor and can rotate under the drive of the magnetic bearing system 4. As a preferred technical solution, the spiral inner cylinder rotates 60°~90° clockwise and / or counterclockwise under the drive of the rotor, rather than rotating a full circle, which not only saves energy consumption but also reduces wear. The spiral inner cylinder 3 rotates in the ash hopper in one direction or left and right (clockwise or counterclockwise), forming a relative motion with the ash hopper, thereby achieving the purpose of disturbing and scraping off the bonded ash layer in the ash hopper, so that the medium and high temperature ash flows smoothly, and avoids the formation of bonded ash accumulation in the ash hopper.

[0021] As a further optimized technical solution, the wall surface of the ash falling pipe in contact with the magnetic bearing system 4 adopts a heat-resistant ceramic structure.

[0022] The use of a magnetic bearing system 4 instead of gears can maintain the sealing of the ash hopper and avoid secondary pollution that may be caused by fly ash leakage.

[0023] The spiral blade or helical structure has less wear. The application of magnetic bearing system solves the sealing problem of the ash falling pipe, and at the same time ensures that the inside of the ash falling pipe is smooth and the ash falls smoothly.

[0024] In order to better disturb the ash in the ash hopper, further, such as Figure 2 As shown, an ash spraying ring pipe 5 is arranged on the top of the ash falling pipe 2, and 2-4 nozzles are arranged on the ash spraying ring pipe 5. The nozzles are evenly arranged around the ash falling pipe 2 and are connected to the ash falling pipe 2 through a loose air duct, which can spray loose air into the ash hopper. The loose air duct is horizontal or arranged at an elevation angle β toward the ash hopper, so that the loose air is sprayed in at a horizontal angle or upward, and the upward elevation angle β is ≤30°. Air is usually used as the loose air.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-adhesion ash discharge device, which can be arranged at the bottom of an ash hopper, wherein the ash hopper is funnel-shaped and comprises a cone hopper (1) arranged at the top and a cylindrical ash discharge pipe (2) connected to the bottom of the cone hopper (1), characterized in that: include: The spiral inner cylinder (3) can be arranged close to the inner wall of the ash hopper, and its shape corresponds to the shape of the ash hopper: the spiral inner cylinder adopts a spiral blade structure or a spiral structure; A magnetic bearing system (4) is arranged on the ash falling pipe, and the spiral inner cylinder can rotate under the drive of the magnetic bearing system (4).

2. The ash discharging device according to claim 1, characterized in that: When the spiral inner cylinder adopts a spiral blade structure, the spiral inner cylinder is mainly composed of a plurality of spiral shaftless blades.

3. The ash discharging device according to claim 2, characterized in that: An ash spraying ring pipe (5) is arranged at the top of the ash dropping pipe (2), and 2-4 nozzles are arranged on the ash spraying ring pipe (5). The nozzles are evenly arranged around the ash dropping pipe (2) and can spray loose air into the ash hopper.

4. The ash discharging device according to claim 3, characterized in that: The nozzle is connected to the ash falling pipe (2) via a loose air duct, and the loose air duct is arranged horizontally or upwardly, and the upward elevation angle β is ≤30°.

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