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CN-224222008-U - Continuous automatic separating device for large-particle-size gangue sundries of coal-fired conveying system

CN224222008UCN 224222008 UCN224222008 UCN 224222008UCN-224222008-U

Abstract

The application discloses a continuous and automatic separating device for large-particle-size gangue sundries of a coal-fired conveying system, wherein a box body is arranged at the tail end of a coal-fired conveying belt of the coal-fired conveying system, a rotating shaft is arranged in the box body perpendicular to the running direction of the coal-fired conveying belt and is positioned obliquely below the tail end of the coal-fired conveying belt, a plurality of separating cutter groups are arranged on the rotating shaft at intervals along the circumferential direction, each separating cutter group is composed of a plurality of separating teeth which are axially and equidistantly arranged on the rotating shaft, the interval between every two adjacent separating teeth is smaller than the particle size of the large-particle-size gangue sundries, and the bottom of the box body is divided into a qualified coal-fired discharging cylinder and a large-particle-size gangue sundries discharging cylinder. The separating device mainly separates and removes impurities such as large-particle-size gangue and saw dust which are mixed in the coal from the fuel system, ensures that the quality of the coal entering the next stage is qualified to meet the combustion requirement of the boiler, greatly improves the safe and stable operation of a coal dropping pipe, screening and crushing equipment and the boiler of the coal conveying system, can ensure the long-period safe operation of a unit, and reduces the maintenance cost of the equipment, the output of the unit and the unplanned shutdown.

Inventors

  • YANG JIANHUI
  • HU GANG
  • WANG RUIPING

Assignees

  • 陕西能源麟北发电有限公司

Dates

Publication Date
20260512
Application Date
20250606

Claims (5)

  1. 1. A continuous and automatic separating device for large-grain-size coal gangue sundries of a coal-fired conveying system is characterized in that a box body is arranged at the tail end of a coal-fired conveying belt of the coal-fired conveying system, the tail end of the coal-fired conveying belt stretches into the box body, a rotating shaft is arranged in the box body perpendicular to the running direction of the coal-fired conveying belt and is positioned obliquely below the tail end of the coal-fired conveying belt, a plurality of separating knife sets are arranged on the rotating shaft at intervals along the circumferential direction, each separating knife set is composed of a plurality of separating teeth which are axially and equidistantly arranged on the rotating shaft, the distance between every two adjacent separating teeth is smaller than the grain size of the large-grain-size coal gangue sundries, the bottom of the box body is divided into a qualified discharging cylinder and a large-grain-size coal gangue sundries discharging cylinder, when the tail end of the coal-fired conveying belt falls down, the qualified coal gangue sundries smaller than the separating tooth spacing directly fall into the qualified discharging cylinder, and the large-grain gangue sundries larger than the separating tooth spacing are driven by the adjacent separating teeth to rotate and fall into the large-grain gangue discharging cylinder.
  2. 2. The separating apparatus of claim 1, wherein each of the separating teeth has a sickle-shaped structure curved toward a rotation direction thereof, and side edges of the separating teeth in the rotation direction are provided in a zigzag-shaped structure.
  3. 3. The separating apparatus of claim 2, wherein a mounting plate is provided on an inner wall of the case opposite to the end of the coal conveyor belt, a plurality of removing teeth are fixed on the mounting plate at equal intervals, and each removing tooth extends between adjacent separating teeth when the separating knife set rotates.
  4. 4. The separating device of claim 3, wherein the rejecting teeth are arranged in an inclined posture with high upper ends and low lower ends, so that the separating teeth are gradually overlapped along the outer ends of the rejecting teeth towards the inner ends.
  5. 5. The separating apparatus of claim 4, wherein the reject teeth are in a sickle-shaped configuration that curves downward.

Description

Continuous automatic separating device for large-particle-size gangue sundries of coal-fired conveying system Technical Field The application relates to the technical field of coal-fired power generation, in particular to a continuous and automatic separating device for large-particle-size gangue sundries of a coal-fired conveying system. Background At present, raw coal and low-calorific-value coal are mainly used for producing coal types in factories, the content of gangue in the raw coal is more than 10 percent on average, the particle size of the large-particle gangue is generally more than 120mm, other sundries such as sawdust are mixed, and the mixture of the coal and the sundries is transported to a combustion system for combustion, so that the problems of aggravation of equipment abrasion of the fuel system, damage of a transportation belt, difficulty in controlling the particle size of the coal in the furnace are caused, and meanwhile, the unqualified particle size in the coal in the furnace is all the gangue, so that the safe and stable operation of the boiler is influenced. The fuel system of the thermal pithead power plant is provided with coarse crushing or fine crushing and screening facilities (comprising a coarse roller screen, a ring hammer crusher, a fine roller screen, a reversible hammering crusher and an inspection screen), and can be replaced and upgraded on crushing and screening equipment, so that the output capacity of the equipment is increased, the crushing capacity of gangue sundries is improved, the problems that the equipment abrasion of the fuel system is aggravated and the like are solved, but the equipment operation safety cannot be met, the energy consumption is high, and the maintenance workload cost is high. Disclosure of Invention Aiming at the problems, the application aims to provide a continuous and automatic separating device for large-particle-size gangue sundries of a coal-fired conveying system, which can separate the sundries from a coal flow, ensure that the quality of the coal entering the next stage is qualified to meet the combustion requirement of a boiler, greatly improve the safe and stable operation of a coal-falling pipe, screening and crushing equipment and the boiler of the coal-fired conveying system, ensure the long-period safe operation of a unit, reduce the maintenance cost of the equipment, the descending output of the unit and the unplanned shutdown. The technical scheme includes that the continuous and automatic separation device for the large-grain-size coal gangue sundries of the coal-fired conveying system comprises a box body arranged at the tail end of a coal conveying belt of the coal-fired conveying system, the tail end of the coal conveying belt stretches into the box body, a rotating shaft is arranged in the box body and perpendicular to the running direction of the coal conveying belt and is positioned obliquely below the tail end of the coal conveying belt, a plurality of separation cutter groups are arranged on the rotating shaft at intervals along the circumferential direction, each separation cutter group is composed of a plurality of separation teeth which are axially and equidistantly arranged on the rotating shaft, the interval between every two adjacent separation teeth is smaller than the grain size of the large-grain-size coal gangue sundries, the bottom of the box body is divided into a qualified discharging cylinder and a large-grain-size coal gangue sundries discharging cylinder, when the tail end of the coal conveying belt falls down, qualified coal gangue sundries smaller than the separation teeth interval fall into the qualified discharging cylinder directly, and large-grain gangue sundries larger than the separation teeth are driven by the adjacent separation teeth to rotate and fall into the large-grain discharging cylinder. Preferably, each of the separating teeth has a sickle-shaped structure curved toward the rotation direction thereof, and the side edges of the separating teeth in the rotation direction are provided in a zigzag structure. Preferably, the inner wall of the box body opposite to the tail end of the coal conveying belt is provided with an assembly plate, a plurality of removing teeth are fixed on the assembly plate at equal intervals, and each removing tooth stretches into between every two adjacent separating teeth when the separating knife set rotates. Preferably, the removing teeth are arranged according to inclined postures with high upper ends and low lower ends, so that the separating teeth are gradually overlapped along the direction from the outer ends to the inner ends of the removing teeth. Preferably, the removing teeth are in a sickle-shaped structure which is bent downwards. The beneficial effects of the application are as follows: 1. The separating device mainly separates and removes sundries such as large-particle-size gangue and wood dust which are mixed in the coal from the fuel system