The Differences Between Coal Crushers and Coal Feeder Breakers
In the process of coal mining and processing, the crushing stage is a crucial step to ensure the efficient utilization of coal resources. Coal crushers and coal feeder breakers, as the core equipment in this stage, are often used interchangeably.
This article will provide a detailed analysis of the differences and connections between the two from aspects such as equipment definitions, classifications, comparisons, application scenarios, selection factors, and maintenance, to assist you in making an accurate choice.
Basic Definitions of Crushers and Breakers
Crushers
Crushers are a type of equipment that breaks large solid materials into smaller particles through mechanical actions such as compression, impact, and shearing. Their core function is to reduce the particle size of materials to meet the requirements of subsequent processing, transportation, or use.
In the coal industry, crushers can handle raw coal with high hardness and large block size. The particle size range of the crushed products is wide, which can adapt to different process requirements.
Feeder breakers
Feeder Breakers focus more on the “crushing and separation” of materials, especially suitable for scenarios containing impurities or requiring grading.
Take coal feeder breakers as an example; they can not only crush raw coal but also separate impurities such as gangue from the coal through screening, and preliminarily grade the crushed materials. Their crushing force is relatively mild, emphasizing selective crushing and separation effects of materials.
In-depth Analysis of Coal Crushers
Working Principle
Coal crushers apply mechanical force to the raw coal entering the equipment through high-speed rotating hammer heads, jaw plates, or rollers, etc.
For instance, jaw crushers crush materials by the periodic opening and closing of the movable jaw and the fixed jaw; cone crushers crush materials by the rotation of the crushing cone driven by the eccentric shaft, through squeezing and bending; impact crushers achieve crushing through the collision of materials moving at high speed with the impact plate or the impeller.
Core Features
Strong processing capacity: Can crush raw coal with a block size of over 1 meter, with processing capacity ranging from several tons to several thousand tons per hour.
Adaptability to high-hardness materials: Can handle hard bituminous coal, anthracite, etc.
Adjustable crushing particle size: By adjusting equipment parameters (such as jaw plate spacing, hammer head speed), different particle sizes of products can be obtained.
Types and Characteristics of Crushers
Jaw crushers
The core components are the movable jaw and the fixed jaw, which crush materials through squeezing. They are suitable for hard coal and large raw coal blocks, with product particle sizes ranging from 10 to 300mm. Their features include simple structure, high reliability, and easy maintenance.
Cone crushers
The core components include the crushing cone and the liner, which crush materials through squeezing and bending. They are suitable for medium-hard coal, with product particle sizes ranging from 5 to 50mm. They have high crushing efficiency and uniform product particle size.
Impact crushers
Mainly rely on the impeller and the impact plate to achieve crushing through impact and collision. They are suitable for soft coal and medium-hard coal, with product particle sizes ranging from 0 to 20mm. They have a large crushing ratio and the products are cubic.
Roll crushers
The core components are parallel rolls or toothed rolls, which crush materials through squeezing and shearing. They are suitable for medium-soft coal and easily crushed coal, with product particle sizes ranging from 1 to 50mm. They have low energy consumption and less over-crushing.
Typical Applications
Coarse and medium crushing of raw coal after underground or open-pit mining in coal mines.
Pre-treatment of raw coal in coal washing plants to provide qualified particle size raw materials for subsequent washing processes.
Crushing raw coal to a suitable particle size for boiler combustion in thermal power plants.
Comprehensive Analysis of Coal Breakers
Working Principle
Coal breakers (such as feeder breakers) usually combine crushing and screening functions. After the materials enter the equipment, they are initially crushed by the crushing components (such as chain plates, toothed rolls), and then screened through the bottom screen or grating.
Materials smaller than the screen holes are discharged, while those larger than the screen holes continue to be crushed. At the same time, impurities (such as gangue) are separated due to differences in particle size or density.
Core Features
Combination of crushing and screening functions: Reduces the investment in subsequent equipment and simplifies the process flow.
Selective crushing: The crushing effect on coal is better than that on gangue, reducing the over-crushing of useful materials.
Strong adaptability: Can handle raw coal with a high impurity content or high moisture, and is less prone to clogging.
Types and Characteristics of Breakers
Chain breakers: The core components are chains and screen plates, which have the function of crushing and separating impurities simultaneously. They are suitable for handling wet coal and are mainly used in underground raw coal processing, with processing capacity ranging from 50 to 500t/h.
Toothed roller breakers: The core components include toothed rollers and adjustment devices, which can achieve selective crushing and precise particle size control. They are suitable for pre-treatment in coal preparation plants, with a processing capacity of 100-1000t/h.
Feeder breaker: It is equipped with a feeding mechanism and crushing rollers, capable of integrating continuous feeding, crushing, and screening. It is suitable for continuous mining systems in open-pit or underground mines, with a processing capacity of 200-2000t/h.
Typical Applications
In underground coal mining faces, it is used for the initial crushing and separation of raw coal to facilitate transportation.
In the pre-treatment stage of coal preparation plants, it is used to separate large pieces of gangue from raw coal to improve the efficiency of subsequent sorting.
In small and medium-sized coal mines, it serves as a primary breaker to meet simple crushing and grading requirements.
Comparative Analysis of Crushers and Breakers
Functional Differences
Crushers: Focusing on reducing particle size, they do not have built-in screening or separation functions (some models require separate screening equipment).
Feeder Breakers: Combining crushing with separation or grading, they perform material screening during the crushing process to reduce impurities.
Material Characteristics
Crushers: More suitable for processing single and pure raw coal. They are prone to blockage when dealing with materials with high impurity content or high moisture.
Feeder Breakers: Better at handling raw coal with high impurity content and high moisture, reducing the impact of impurities through screening functions.
Energy Consumption and Efficiency
Crushers: Higher energy consumption when crushing hard materials, but more efficient in processing large pieces of materials.
Feeder Breakers: Slightly higher unit energy consumption due to the added screening process, but they can reduce energy consumption in subsequent processes, making the overall process more efficient.
Cost and Maintenance
Crushers: Initial purchase costs vary by type (jaw crushers are lower, while cone crushers are higher). Wear parts (such as jaw plates and hammer heads) need to be replaced frequently.
Feeder Breakers: Higher initial costs due to integrated design, but lower long-term comprehensive costs due to reduced subsequent equipment investment. Regular maintenance is required for components such as screens and tooth plates.
Application Scenarios of Crushers and Breakers
Main Application Scenarios of Crushers
Coarse crushing in large coal mines: Processing large pieces of raw coal after blasting to lay the foundation for subsequent transportation and processing.
High-hardness coal processing: For example, the crushing of anthracite, which requires a combination of jaw and cone crushers for multi-stage crushing.
Large-scale production needs: In scenarios where there is a high demand for coal, such as thermal power plants and coal chemical enterprises, efficient crushers are needed to ensure continuous production.
Main Application Scenarios of Breakers
Underground mining sites: Feeder breakers can be directly installed at the working face to crush raw coal and transport it out through conveyor belts, reducing underground transportation pressure.
Pre-treatment in coal preparation plants: Separating gangue and impurities from raw coal to improve the purity of selected coal and reduce washing costs.
Small and medium-sized coal mines: Without complex processes, the integrated functions of breakers can meet the simple requirements of “crushing + preliminary grading”.
Key Factors for Selection
When choosing coal crushers or feeder breakers, the following factors should be comprehensively considered:
Material Characteristics
Raw coal size: For large pieces of raw coal (>1 meter), jaw crushers are preferred; for medium-sized pieces (300-1000mm), feeder breakers or roller crushers can be considered.
Hardness and impurity content: For high-hardness and low-impurity materials, crushers are selected; for medium-low hardness and high-impurity materials, feeder breakers are preferred. 1. Humidity: When the moisture content is high (>15%), the anti-clogging design of breakers has more advantages.
Process Requirements
Product particle size: If fine particle size (<10mm) is required, impact crushers or toothed roll breakers can be chosen; if only coarse crushing (>50mm) is needed, jaw crushers are more suitable.
Subsequent processes: When washing or grading is required, feeder breakers are preferred; when direct combustion or transportation is needed, crushers can be selected.
Production Scale
Small-scale production: Toothed roll breakers or small jaw crushers can meet the demand.
Large-scale production: Large crushers (such as jaw + cone combinations) or feeder breakers and other high-efficiency equipment need to be configured.
Cost Budget
Limited initial budget: Simple-structured jaw crushers can be chosen, and screening equipment can be added later as needed.
Long-term comprehensive cost priority: The integrated functions of feeder breakers can reduce equipment investment and energy consumption, making them more suitable for long-term operation.
Equipment Maintenance and Troubleshooting
Key Points of Daily Maintenance
Regular inspection of wear parts: The hammer heads and jaw plates of crushers, and the screens and toothed rolls of breakers need to be inspected regularly for wear and replaced in time.
Lubrication system: Add lubricating oil as per the manual to ensure smooth operation of bearings, gears, etc.
Cleaning and dust removal: Keep the interior of the equipment clean to avoid material residue causing blockages or increased wear, especially in the screen area of feeder breakers.
Common Faults and Solutions
Blockage: Feeding too fast or high moisture content of materials can cause blockage. Reduce the feeding rate, clear the blockage, and replace the anti-clogging screen of feeder breakers if necessary.
Unqualified particle size: If the product particle size is too large, it may be due to wear of the crushing parts or improper adjustment of the gap. Replace the parts or readjust the parameters.
Abnormal noise or vibration: Mostly due to loose parts or imbalance. Stop the machine for inspection, tighten the screws, and calibrate the rotor or roller shaft.
