Integrated drying and dry separation apparatus for upgrading raw coal and method thereof

• US 8,739,975 B2
• Filed: 11/19/2010
• Issued: 06/03/2014
• Est. Priority Date: 11/19/2009
• Status: Active Grant

• Current Assignee: Gongmin Li
• Original Assignee: Gongmin Li
• Inventors: Li, Gongmin
• Primary Examiner(s): Gonzalez, Luis A
• Application Number:
  US13/510,642
• Publication Number:
  US 20120228197A1
• Time in Patent Office: 1,292 Days
• Field of Search: 209/3, 209/11, 209/8, 209/10, 209/238, 209/241, 446/20, 446/26, 241/24.24
• US Class Current: 209/11
• CPC Class Codes: C10L 9/08 by heat treatments, e.g. calcining
• CPC Class Codes: F26B 17/26 with movement performed by reciprocating or oscillating conveyors propelling materials over stationary surfaces; with movement performed by reciprocating or oscillating shelves, sieves, or trays F26B17/006 takes precedence
• CPC Class Codes: F26B 23/02 using combustion heating F26B3/305, F26B13/186, F26B21/001, F26B23/10 take precedence
• CPC Class Codes: F26B 25/007 Dust filtering; Exhaust dust filters

Abstract

An integrated drying and dry-separating apparatus for upgrading raw coal includes a coal supply system, a hot air system, a drying system, a dedusting and exhausting system, and a dry-separating system. The coal supply system conveys raw coal to the hot air system and the drying system by a raw coal conveyer respectively. The hot air system is a heat source of the drying system. The drying system is used for drying and dewatering the raw coal. The dedusting and exhausting system is consisted of a deduster and an exhaust fan, and establishes a connection between the drying system and the dry-separating system. The dry-separating system includes a dry separator, a circulating fan, and a cyclone deduster, which is used for separating dried raw coal into fancy coal, middling coal and coal gangue. A method for dry-separating and drying raw coal using the apparatus is also provided.

Claims

1. An integrated drying and dry separation apparatus for upgrading raw coal, comprising:

a coal supply system, a hot air system, a drying system, a dedusting and exhausting system, and a drying separation system,

the coal supply system is separable into two portions, a coal supply for dry raw coal and a coal supply for hot air furnace;

the coal supply system supplies raw coal to the hot air system and the drying system respectively by using a raw coal conveyor;

the hot air system is a heat source portion of the drying system comprises a hot air furnace, a settling chamber and a first main fan, the hot air system supplies hot air with certain temperature pressurized by the first main fan to the drying system, wherein the hot air with certain temperature is formed by removing sparks from flue gas produced in the hot air furnace when passing through the settling chamber and then mixing the processed flue gas with cold air, an air outlet of a first main fan is connected to a lower portion of a dryer in the drying system;

the drying system is configured for drying and dehydrating the raw coal, and for reducing the water content of the raw coal, wherein the dried coal products are conveyed to the dry separation system by a dried product conveyor;

the dedusting and exhausting system is configured for recycling fine particles of coal dust, comprising a dust remover and an exhaust blower, connected between the drying system and the dry separation system, the exhaust blower includes a draught fan and an exhaust pipe; and

the dry separation system comprises a dry separator, a circulating fan and a cyclone dust remover, and is configured to separate the dried raw coal into fancy coal, middling coal and coal gangue.

2. The integrated drying and dry separation apparatus for upgrading raw coal according to claim 1, characterized in that, the temperature of said hot air formed by removing sparks from flue gas produced in the hot air furnace when passing through the settling chamber and then mixing the processed flue gas with cold air is about 50°

C.-280°

C.

3. The integrated drying and dry separation apparatus for upgrading raw coal according to claim 1, characterized in that, the temperature of said hot air formed by mixing with the cold air is about 250°

C.

4. The integrated drying and dry separation apparatus for upgrading raw coal according to claim 1, characterized in that, said raw coal conveyor is a belt conveyor for raw coal, and said dried products conveyor is a belt conveyor for dried products.

5. The integrated drying and dry separation apparatus for upgrading raw coal according to claim 1, characterized in that, the core equipment of the drying system is a mixed-flowing vibrating dryer.

6. The integrated drying and dry separation apparatus for upgrading raw coal according to claim 1, characterized in that, said dry separator in the dry separation system is a composite dry separator.

7. The integrated drying and dry separation apparatus for upgrading raw coal according to claim 1, characterized in that, said hot air furnace is a chain type hot air furnace or a boiling type hot air furnace.

8. An integrated drying and dry separation process for upgrading raw coal by using the integrated drying and dry separation comprising a coal supply system, a hot air system, a drying system, a dedusting and exhausting system, and a drying separation system, wherein,

the coal supply system can be divided into two portions, a coal supply for dry raw coal and a coal supply for a hot air furnace;

the coal supply system supplies raw coal to the hot air system and the drying system respectively by using a raw coal conveyor;

the hot air system is a heat source portion of the drying system, it comprises a hot air furnace, a settling chamber and a first main fan;

the hot air system supplies hot air with certain temperature pressurized by the first main fan to the drying system, wherein the hot air with certain temperature is formed by removing sparks from flue gas produced in the hot air furnace when passing through the settling chamber and then mixing the processed flue gas with cold air;

an air outlet of the first main fan is connected to a lower portion of a dryer in the drying system;

the drying system is configured for drying and rehydrating the raw coal, and for reducing the water content of the raw coal, wherein the dried coal products are conveyed to the dry separation system by a dried product conveyor;

the dedusting and exhausting system is configured for recycling fine particles of coal dust, comprising a dust remover and a exhaust blower, connected between the drying system and the dry separation system;

the exhaust blower consists of a draught fan and an exhaust pipe; and

the dry separation system comprises a dry separator, a circulating fan and a cyclone dust remover, and is configured for separating the dried raw coal into fancy coal, middling coal and coal gangue;

wherein the process comprises the following steps;

1) supplying coal for drying and coal for the hot air furnace by using the coal supply system;

the hot air furnace can be a chain type hot air furnace or a boiling type hot air furnace, the raw coal is directly used as fuel of the chain type hot air furnace when the lower heating value of the raw coal is larger than 16000 J/kg, namely larger than 3840 kilocalorie/kg; and

the boiling type hot air furnace is adopted as the hot air furnace of the coal supply system when the lower heating value of the raw coal is less than 16000 KJ/kg;

2) supplying hot air with a temperature between 150°

C.-280°

C. pressurized by the first main fan to the lower portion of the dryer in the drying system by using the hot air system, wherein the hot air is formed by removing sparks from flue gas produced in the hot air furnace and then mixing the processed flue gas with cold air;

3) using the drying system to dry the raw coal;

the drying system uses a mixed-flowing vibrating dryer, the coal flow passes through a multi-layered vibration bed from top to bottom and flows to a coal outlet, the hot air passes through the multi-layered vibration bed and is discharged via a top exhaust outlet, the macro-flow between the coal flow and the hot air is a counter flow, that is, both a vertical cross flow and a horizontal counter flow between the coal and the hot air are present within the dryer;

4) using the dedusting and exhausting system to remove the dust;

the dedusting and exhausting system is composed of a dust remover and a exhaust blower, the dust remover separates coal powder from exhaust gas, and the separated coal powder is incorporated into coal product, the processed, cleaned exhaust gas is evacuated via the exhaust blower; and

5) using the dry separation system to separate the dried raw coal into fancy coal, middling coal and coal gangue, the fancy coal is sold as coal product, the middling coal may be either incorporated into the fancy coal to be sold as the coal product coal or returned to a coal inlet to be separated again, part of the coal gangue is used as fuel of the boiling type hot air furnace, and the other part is disposed as waste material.