CN-121993610-A - Double-plate valve device for discharging pipe of preheater and using method of double-plate valve device

CN121993610ACN 121993610 ACN121993610 ACN 121993610ACN-121993610-A

Abstract

The invention belongs to the technical field of engineering elements, and particularly relates to a valve, in particular to a double-plate valve device for a discharging pipe of a preheater and a use method thereof. The double-plate valve device for the discharging pipe of the preheater comprises a valve body, valve plates and a cleaning plate, wherein the valve body is provided with annular side walls, the annular side walls define a material channel, the two valve plates are rotatably arranged in the material channel and used for controlling the on-off and flow of materials, the cleaning plate is slidably arranged on one side of the inner wall of the valve body, which is positioned on the back of the valve plate, and is linked with the valve plates, one end of the guiding hole extends along the axial direction of the valve body, the other end of the guiding hole extends along the radial direction of the valve body, the cleaning plate is pushed to slide downwards when the valve plate is opened so as to clean the crust of the annular side walls, and after the air flow flowing upwards from the bottom of the valve body passes through the guiding hole, the guiding hole changes the air flow direction so that the materials are gathered and fall towards the axis direction of the valve body.

Inventors

MA XIAOZHI
FENG JUNJIE
DING RUI
DOU BOWEN
LI HONGCUI
ZHU GENGWU
SHI HONG

Assignees

中建材(徐州)重型机械有限公司

Dates

Publication Date: 20260508
Application Date: 20260313

Claims (11)

1. A double plate valve device for a discharge pipe of a preheater, comprising: A valve body (1), a valve plate (2) and a cleaning plate (3), wherein the valve body (1) is provided with an annular side wall (10), and the annular side wall (10) defines a material channel; The two valve plates (2) are rotatably arranged in the material channel and are used for controlling the on-off and flow of materials; the cleaning plate (3) is arranged on one side of the inner wall of the valve body (1) positioned at the back of the valve plate (2) in a sliding manner and is linked with the valve plate (2); A diversion hole (30) is formed in the cleaning plate (3), one end of the diversion hole (30) extends along the axial direction of the valve body (1), and the other end extends along the radial direction of the valve body (1); wherein, when the valve plate (2) is opened, the cleaning plate (3) is pushed to slide downwards so as to clean the crust of the annular side wall (10); After the air flow flowing upwards from the bottom of the valve body (1) passes through the diversion holes (30), the diversion holes (30) change the air flow direction so as to enable the materials to gather and fall in the axial direction of the valve body (1).
2. A dual plate valve device for a discharge pipe of a preheater as set forth in claim 1, wherein, The annular side wall (10) is provided with a compression spring (11) near the position of the cleaning plate (3), the upper end of the compression spring (11) is in butt joint with the inner side wall of the cleaning plate (3), and the compression spring (11) is used for pushing the cleaning plate (3) to slide and reset towards the upward inclined direction.
3. A dual plate valve device for a discharge pipe of a preheater as set forth in claim 1, wherein, The upper end edge of the cleaning plate (3) is provided with an arc chamfer (31), the valve plate (2) is abutted against the arc chamfer (31) when turned over in the opening direction, and the cleaning plate (3) is pushed to slide downwards continuously under the guiding action of the arc chamfer (31).
4. A dual plate valve device for a discharge pipe of a preheater as set forth in claim 1, wherein, The surface of the cleaning plate (3) is provided with a wear-resistant and high-temperature-resistant coating, and the material of the coating is selected from tungsten carbide, chromium oxide or silicon nitride ceramics.
5. A dual plate valve device for a discharge pipe of a preheater as set forth in claim 2, wherein, The annular side wall (10) is provided with a spring mounting groove, the lower end of the compression spring (11) is embedded and fixed in the spring mounting groove, and the upper end of the compression spring (11) is elastically abutted to the bottom of the cleaning plate (3).
6. A dual plate valve device for a discharge pipe of a preheater as set forth in claim 1, wherein, The guide holes (30) are arranged on the cleaning plate (3) in an array mode, and the radial sections of the guide holes (30) face the axis direction of the valve body (1).
7. A dual plate valve device for a discharge pipe of a preheater as set forth in claim 1, wherein, The outer side wall of the cleaning plate (3) is attached to the inner side wall of the annular side wall (10), and the sliding stroke of the cleaning plate (3) is matched with the maximum opening and closing angle of the valve plate (2).
8. A dual plate valve device for a discharge pipe of a preheater as set forth in claim 1, wherein, The back of valve plate (2) is equipped with boss (21), boss (21) and clearance board (3) butt, promote clearance board (3) slip through boss (21) when valve plate (2) rotate.
9. A double plate valve device for a discharge pipe of a preheater, comprising: The device comprises a valve body (1), wherein an annular side wall (10) of the valve body (1) is enclosed to form a vertical material channel, and a guiding matching structure for sliding a cleaning plate (3) is arranged on the inner side of the annular side wall (10); The two symmetrically arranged valve plates (2) are rotationally connected with the valve body (1) through pivots, and the rotation opening and closing directions of the two valve plates (2) are adapted to the on-off control requirements of the material channel; The cleaning plate (3) is in sliding fit with the guide fit structure, the cleaning plate (3) is in linkage fit with the back of the valve plate (2) in a propping way, and the valve plate (2) can push the cleaning plate (3) to slide downwards along the annular side wall (10) when rotating in the opening direction; The cleaning plate (3) is provided with a diversion hole (30) in a penetrating mode, an axial section of the diversion hole (30) extends along the vertical axial direction of the valve body (1), a radial section extends along the horizontal radial direction of the valve body (1), the axial section is communicated with the radial section, and ascending air at the bottom of the valve body (1) enters through the axial section and flows out of the radial section and diverges towards the axis direction of the valve body (1) so as to drive materials to aggregate and fall towards the axis.
10. A method of using a double plate valve device for a discharge pipe of a preheater according to any one of claims 1 to 9, said method comprising: S1, debugging a device, namely after the double-plate valve device and a blanking pipe of a preheater are assembled, debugging the rotation flexibility of a valve plate (2) and the sliding fit of a cleaning plate (3) to ensure that a compression spring (11) can push the cleaning plate (3) to reset normally; S2, normally blanking, controlling the opening and closing angle of the valve plate (2) according to the material conveying requirement of the preheater, pushing the cleaning plate (3) to slide downwards in the opening process of the valve plate (2), scraping off the crust of the annular side wall (10) of the valve body (1), and pushing the cleaning plate (3) to slide upwards and reset by the compression spring (11) in the closing process of the valve plate (2), so as to finish primary crust cleaning action; S3, air flow diversion, in the blanking process, the diversion hole (30) is utilized to reverse the ascending air flow at the bottom of the valve body (1), so that the air flow drives the material to gather and fall towards the axis of the valve body (1), the contact area of the material and the annular side wall (10) is reduced, and the adhesion skinning probability of the material on the annular side wall (10) is reduced from the source; S4, periodically maintaining, periodically checking the smoothness of the wear-resistant high-temperature-resistant coating of the cleaning plate (3) and the diversion holes (30), repairing or replacing the damaged cleaning plate (3) of the coating, and dredging the blocked diversion holes (30).
11. The method for using the double plate valve device for the discharge pipe of the preheater according to claim 10, wherein, In the step S2, the opening and closing operation of the valve plate (2) is controlled intermittently, and each time the valve plate (2) rotates from being closed to the maximum opening and closing angle, the cleaning plate (3) is driven to complete one complete downward scraping action.

Description

Double-plate valve device for discharging pipe of preheater and using method of double-plate valve device Technical Field The invention belongs to the technical field of engineering elements, and particularly relates to a valve, in particular to a double-plate valve device for a discharging pipe of a preheater and a use method thereof. Background In the cement production process, a discharging pipe of the preheater is a key channel for connecting all stages of cyclones with a decomposing furnace or a rotary kiln, and the smooth circulation of materials in the preheater directly influences the thermal efficiency and the operation stability of the whole production line. The double plate valve is used as a core control part of the blanking pipe, and the material flow regulation and the system sealing are realized mainly through the opening and closing of the valve plate, so that the negative pressure environment and the heat exchange efficiency of the preheater system are ensured. However, in the actual production process, the problem of skinning is prominent because of the high-temperature working environment of the inner wall of the double plate valve, namely, the internal temperature of the preheater is generally 300-850 ℃, the organic components in the alternative raw materials are decomposed and combusted at high temperature, and the generated molten ash, alkali metal salts and incomplete burnout carbon residues are extremely easy to adhere and deposit in the area of the side wall (the back of the adjacent valve plate) of the double plate valve, so that hard and compact skinning is formed. When the thickness of the crust reaches a critical value, the valve plate can be completely clamped, so that a blanking pipe is blocked, and the production line is forced to stop for maintenance. The traditional double-plate valve structure only focuses on the wear resistance and sealing performance of the valve plate, and is not optimally designed for clearing blockage and preventing after skinning. The conventional blockage clearing mode such as manual knocking and high-pressure air blowing has the defects of high labor intensity, high safety risk and limited blockage clearing effect, and can not fundamentally solve the problem of repeated formation of crusts. The problems cause the increase of unplanned downtime of a preheater system of a cement plant, the significant rise of maintenance cost, and the restriction of large-scale application of alternative raw materials, and become a technical bottleneck in the green low-carbon transformation process of the cement industry. Therefore, there is a need to develop a dual plate valve device for a discharge pipe of a preheater, which can effectively prevent the formation of crust and quickly remove the blockage after the formation of crust, and a use method thereof, which are technical problems in the art. It should be noted that the above information disclosed in this background section is only for understanding the background of the inventive concept and therefore the above description is not to be construed as constituting information of the related art. Disclosure of Invention The embodiment of the disclosure at least provides a double-plate valve device for a feed pipe of a preheater and a use method thereof. In a first aspect, embodiments of the present disclosure provide a dual plate valve apparatus for a discharge tube of a preheater, comprising: the valve comprises a valve body, a valve plate and a cleaning plate, wherein the valve body is provided with an annular side wall which defines a material channel; the two valve plates are rotatably arranged in the material channel and used for controlling the on-off and flow of materials; The cleaning plate is arranged on one side of the inner wall of the valve body, which is positioned at the back of the valve plate, in a sliding way and is linked with the valve plate; The cleaning plate is provided with a diversion hole, one end of the diversion hole extends along the axial direction of the valve body, and the other end extends along the radial direction of the valve body; When the valve plate is opened, the cleaning plate is pushed to slide downwards so as to clean the crust of the annular side wall; After the air flow flowing upwards from the bottom of the valve body passes through the diversion holes, the diversion holes change the air flow direction so as to enable the materials to gather and fall in the axial direction of the valve body. In an alternative embodiment, a compression spring is arranged at the position, close to the cleaning plate, of the annular side wall, the upper end of the compression spring is abutted to the inner side wall of the cleaning plate, and the compression spring is used for pushing the cleaning plate to slide and reset in an inclined upward direction. In an alternative embodiment, the upper edge of the cleaning plate is provided with an arc chamfer, the valve plate is abutted against t