CN-121972280-A - Dry separation system with middlings recleaning function

CN121972280ACN 121972280 ACN121972280 ACN 121972280ACN-121972280-A

Abstract

The invention provides a dry separation system with a middling recleaning function, which comprises a first-stage separation unit, a second-stage separation unit and a middling product chute, wherein the first-stage separation unit comprises a first-stage separation bed, a first-stage air inlet device and a first-stage vibration motor for driving the first-stage separation bed to vibrate, the first-stage air inlet device is positioned below the first-stage separation bed, the second-stage separation unit comprises a second-stage separation bed, the second-stage air inlet device and a second-stage vibration motor for driving the second-stage separation bed to vibrate, the second-stage air inlet device is positioned below the second-stage separation bed, the inlet end of the middling product chute is connected with a middling outlet at the discharge end of the first-stage separation bed, and the outlet end of the middling product chute is communicated with the second-stage separation bed. According to the invention, the high-efficiency reselection of middlings is realized through the structural integration innovation of the two sections of separation beds, the equipment arrangement is simplified, and the production efficiency and the separation precision are improved.

Inventors

WEI ZHONGKUAN
WANG YANG
GAO HANG
LIAN CUNCAI
GUO DALIN

Assignees

中煤(天津)地下工程智能研究院有限公司
中煤天津设计工程有限责任公司

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (10)

1. A dry separation system with middlings recleaning function, comprising: The first section separation unit comprises a first section separation bed, a first section air inlet device and a first section vibration motor for driving the first section separation bed to vibrate, wherein the first section air inlet device is positioned below the first section separation bed and is used for supplying air to the first section separation bed, a clean coal outlet, a middling outlet and a gangue outlet are sequentially arranged at the discharge end of the first section separation bed, and the first section separation bed is provided with a first backboard opposite to the discharge end of the first section separation bed; The secondary separation unit comprises a secondary separation bed, a secondary air inlet device and a secondary vibration motor for driving the secondary separation bed to vibrate, wherein the secondary air inlet device is positioned below the secondary separation bed and is used for supplying air to the secondary separation bed, and a clean coal outlet and a gangue outlet are arranged at the discharge end of the secondary separation bed; The inlet end of the medium coal product chute is used for being connected with a medium coal outlet of the discharging end of the first section of separation bed, and the outlet end of the medium coal product chute is communicated with the feeding end of the second section of separation bed.
2. The dry separation system with the middling recleaning function according to claim 1, wherein the primary separation unit comprises a primary discharge plate, the primary discharge plate is arranged at a discharge end of the primary separation bed, a clean coal section, a middling section and a gangue section are sequentially arranged on the primary discharge plate and are in one-to-one correspondence with a clean coal outlet, a middling outlet and a gangue outlet of the primary separation bed, the middling section of the primary discharge plate is connected with an inlet end of a middling product chute, the secondary separation unit comprises a secondary discharge plate, the secondary discharge plate is arranged at the discharge end of the secondary separation bed, and the secondary discharge plate is provided with the clean coal section and the gangue section and is in one-to-one correspondence with the clean coal outlet and the gangue outlet of the secondary separation bed.
3. The dry separation system with middling reselection function of claim 2, wherein the dry separation system comprises a section of product chute below the section of discharge plate, the section of product chute comprising a first clean coal chute and a first gangue chute, the inlet position of the first clean coal chute corresponding to the clean coal section of the section of discharge plate, the inlet position of the first gangue chute corresponding to the gangue section of the section of discharge plate.
4. The dry separation system with middling reselection function of claim 2, wherein the dry separation system comprises a two-stage product chute positioned below the two-stage discharge plate, the two-stage product chute comprising a second clean coal chute and a second gangue chute, the inlet position of the second clean coal chute corresponding to the clean coal stage of the two-stage discharge plate, the inlet position of the second gangue chute corresponding to the gangue stage of the two-stage discharge plate.
5. The dry separation system with middling reselection function of claim 2, wherein the upper surface of the first section of the discharge plate is higher than the bed surface of the first section of the separation bed at the joint of the first section of the discharge plate and the bed surface of the first section of the separation bed, the upper surface of the second section of the discharge plate is higher than the bed surface of the second section of the separation bed at the joint of the second section of the discharge plate and the bed surface of the second section of the separation bed, and the dry separation system comprises a first servo motor and a second servo motor, wherein the first servo motor is used for adjusting the height of the first section of the discharge plate, and the second servo motor is used for adjusting the height of the second section of the discharge plate.
6. The dry separation system with middling reselection function of claim 1, wherein the outlet end of the middling product chute is connected with the feeding end of the two-stage separation bed through a connecting piece, and the connecting piece is used for allowing coal particles to pass through and preventing the coal particles from falling out of the two-stage separation bed.
7. The dry separation system with middling reselection function of claim 1, wherein the primary air inlet device comprises a plurality of primary air inlet pipes which are distributed at intervals, the wind power of each primary air inlet pipe is adjustable, and the secondary air inlet device comprises a plurality of secondary air inlet pipes which are distributed at intervals, and the wind power of each secondary air inlet pipe is adjustable.
8. The dry separation system with middling reselection function of claim 7, wherein the wind power of the plurality of the first-stage wind pipes is configured to be weakened from a feeding end of the first-stage separation bed to a gangue outlet wind power of the first-stage separation bed, the wind power of the plurality of the second-stage wind pipes is configured to be weakened from the first back plate to a discharging end of the first-stage separation bed, and the wind power of the plurality of the second-stage wind pipes is configured to be weakened from the feeding end of the second-stage separation bed to the gangue outlet wind power of the second-stage separation bed, and the wind power of the second back plate to the discharging end of the second-stage separation bed.
9. The dry separation system with middling reselection function of claim 1, wherein a space is left between the primary separation bed and the secondary separation bed to ensure that the primary separation bed and the secondary separation bed are not in contact during vibration.
10. The dry separation system with middling recleaning function according to claim 1, wherein the dry separation system comprises a dust removing device disposed above the primary separation bed and the secondary separation bed, and sucking dust by negative pressure.

Description

Dry separation system with middlings recleaning function Technical Field The invention relates to the technical field of coal separation, in particular to a dry separation system with a middling coal recleaning function. Background Coal dressing (also called coal washing) is a process ‌ of removing impurities (such as ash, sulfur, gangue and the like) in raw coal by using a physical or chemical method and processing the raw coal into coal products with different qualities according to quality and specification. Clean coal, middling coal and gangue are different products produced in the coal washing and selecting process, and are differentiated according to quality, purposes and components. The clean coal is a ‌ high-quality coal product obtained by washing raw coal to remove impurities such as gangue, and the like, the ash content is low, the heat value is high, the gangue is ‌ solid waste ‌ discharged in the coal exploitation and washing processes, mainly rock clamped in a coal bed, the carbon content is low (about 20% -30%), the clean coal is not easy to burn, the middlings are ‌ intermediate products ‌ generated in the coal separation process, and the density is between the clean coal and the gangue. The coal separation process is mainly divided into two main types, namely wet separation and dry separation. However, the wet separation process needs to consume a large amount of water resources, and a slime water treatment system has to be built in a matched way, so that the problems of high investment cost, long construction period, complex operation and maintenance and the like are solved. The lack of water resources severely restricts the popularization and application of wet coal preparation technology in arid water shortage areas in northwest of China, and simultaneously, the difficulty in treating slime water and the high dehydration cost of clean coal in the wet separation process can directly influence the economic benefit of coal preparation factories for easily-muddy low-rank coal. Dry sorting techniques provide an effective solution to the above-mentioned problems. The dry separation method has the advantages of no water consumption, simple process system, investment saving, short construction period, low running cost and the like, and is particularly suitable for separating low-order easily-slimed raw coal in arid water-deficient areas. However, the dry separator for dry separation still has a plurality of defects in practical application. The existing dry separator has lower separation precision, the separation effect of the middlings generated in the separation process is poor, partial clean coal is mixed in the middlings, if the middlings are directly discharged, the waste of coal resources can be caused, and the clean coal yield and the economic benefit of a coal preparation plant are reduced. In order to solve the problem, in the prior art, transfer equipment such as a belt conveyor is generally adopted, and the separated middlings are collected and then conveyed to a feeding end of a dry separator for re-separation, namely middlings are backwashed. The backwash method has the advantages that although the reselection of the middling is realized to a certain extent, the novel defects are brought, firstly, the backwash method needs to be added with a belt conveyor, a transfer point and a related control system, so that the arrangement of a dry separation system is complex, the occupied area of equipment is increased, secondly, the middling is subjected to transfer backwash through the transfer equipment, the material transportation distance and time are increased, the unit time processing capacity of the dry separation machine is reduced, and in addition, the grain composition and the bed stability of the material are disturbed by repeated transfer and backwash, so that the final separation precision is affected. Disclosure of Invention The invention aims to provide a dry separation system with a middling reselection function, which realizes the efficient middling reselection through the structural integration innovation of two sections of separation beds, simplifies the equipment arrangement and improves the production efficiency and the separation precision. In order to achieve the above object, the present invention provides a dry separation system with a middling recleaning function, comprising: The first section separation unit comprises a first section separation bed, a first section air inlet device and a first section vibration motor for driving the first section separation bed to vibrate, wherein the first section air inlet device is positioned below the first section separation bed and is used for supplying air to the first section separation bed, a clean coal outlet, a middling outlet and a gangue outlet are sequentially arranged at the discharge end of the first section separation bed, and the first section separation bed is provided with a first backboard opposite to the dischar