Pulverized coal preparation production line

Capacity: 50,000-300,000 t/a
Main equipment: air swept mill, dynamic powder separator, explosion-proof dust collector
Raw Material:Lumpy Coal＜ 25mm

From raw material storage and transportation, pre-drying, grinding, powder selection, cooling to finished product storage and transportation system, environmental dust collection system, process design of electrical automation control system, plant planning, equipment supply, equipment installation and commissioning, after-sales training and a series of technical services

Introduction

Our Pulverized Coal Preparation Production Line is composed of Raw Coal Storage & Transportation System, Grinding System, Dust Collecting System, Electrical & Instrument Automation System. By the consideration of safety protection for equipment and system, explosion venting valve and nitrogen protection port are adopted at hot air inlet pipeline of Air Swept Coal Mill and coal air output pipeline. Speed of Powder Separator is regulated by VVF, the output fineness could be controlled by adjustment of frequency converter by remote control.

Process:

 Raw coal storage and transportation system

1. The raw coal with size under 35mm and moisture under 15% is conveyed to raw coal shed by auto dumper. The raw coal storaged in coal shed is loaded to coal receiving hopper by loader. The raw coal in coal receiving hopper is feed to bucket elevator evenly by speed adjustable feeding belt conveyor. The raw coal is discharged when it is lifted to required height and then come to powder making system by double layer air lock valve.

2. The rod valve is set between coal receiving hopper and vibrating feeder. It would be closed for maintenance operation of speed adjustable feeding belt conveyor. The feeding belt conveyor is speed adjustable which facilitate for generating operation and management. The iron separator is set on the top of speed adjustable belt conveyor which could get rid of scrap iron mixed in the raw coal. This maximally reduce the threat of scrap iron to the system.

 Pulverized Coal Preparation System

1. The raw coal from storage and conveying system come into air swept coal mill for grinding. The coal powder mass and heat transfer with 200℃~350℃ hot air. The moisture enter into flue gas from coal. Coal powder is dried by hot air. Then coal powder come to powder separator with airflow for classification. The separated coarse powder come to mill for regrinding. The fine powder comes to powder collecting system with airflow through coal wind pipe.

2. To protect the equipment and system safety, the explosion venting valve and nitrogen protection connector are set on hot wind inlet pipe of air swept coal mill and outlet pipe of coal wind. Powder separator uses frequency conversion motor to adjust speed. It realizes remote control of the discharging fineness of powder separator by adjusting frequency converter.

 Pulverized Coal Collecting System

Under the negative pressure of induced draught fan set after explosion proof bag filter, the qualified coal powder discharged from powder separator, and come to explosion proof bag filter by coal wind pipe. After it goes to filter bags of dust collector for filtration, the coal powder is collected and drop to coal powder hopper underneath the dust collector. The filtered and purified flue gas is discharged to air by funnel through induced fan. The pulverized coal storage in coal powder hopper is discharged to bucket elevator by revolving discharger and screw conveyor and then lift to the top of coal powder hopper by bucket elevator. After that it goes to coal powder hopper by screw conveyor on the top of hopper.

Advantages

1. Saving Energy

Air swept coal mill is an ideal coal processing equipment that can both grind and dry, with characteristics of high efficiency, energy saving, environmental protection, 8% and above of its grinding coal can pass through the 200 mesh screen, and the water content can be under 2%, it is an ideal grinding equipment for coal powders that are used in industrial furnaces and rotary kilns and other equipment.

2. Uniform Particle Size

The improved O-Sepa classifier is a kind of high-efficiency classifier developed on basis of the technology of common O-Sepa classifier and using the most advanced technology in the world. The distribution of finished particles is more uniform, while the particle size ratio is more reasonable.

3. Environmental Protection

Effective measures have been taken to guarantee strict environment protection standards. Different efficient dust collectors are set at all dust producing points according to different characteristics of waste gas.

4. High Degree of Automation   

There is no manual operation in the process of mill running, which realizes the automatic control with long-term, stable, effective, makes milling process more stable, realizes fine work of production.