Integrated Coal Drying and Dry Separation Apparatus
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Solution Overview
Problem
Current coal drying and dry separation methods face limitations due to high water content in raw coal, requiring excessive heat and time, leading to restricted dehydration strength and high investment costs, making it difficult to spread the dry separation method effectively, especially in regions with lignite resources and high water content.
Innovation Solution
An integrated drying and dry separation apparatus that combines a coal supply system, hot air system, drying system, dedusting and exhausting system, and dry separation system, using a mixed-flowing vibrating dryer and composite dry separator, where hot air from a hot air furnace is used to dry coal and then separate it into fancy coal, middling coal, and coal gangue, with the option to recycle coal gangue energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate drying device and dry separation device are used respectively, then drying function and separation function are achieved, but investment cost increases and equipment complexity increases
Solution Approach 1:
The patent combines the drying device and dry separation device into a single integrated apparatus. The drying chamber and separation chamber are merged into one unit, sharing common structures such as the housing, control system, and material handling mechanisms. This integration achieves both drying and separation functions while reducing equipment complexity and investment cost compared to using separate devices.
Solution Approach 2:
The integrated apparatus performs multiple functions within a single device: it dries wet material to reduce moisture content, then separates the dried material by density using air suspension and vibration. The same device structure supports both drying operations and separation operations, making it a multi-functional universal equipment that replaces what would traditionally require two separate specialized devices.
2Productivity
If drying device operates to increase production quantity, then productivity increases, but dehydration strength is restricted to 6-12%
Solution Approach 1:
The patent divides the drying process into two distinct stages: a pre-drying stage that removes the majority of moisture rapidly to achieve high dehydration strength (beyond the conventional 6-12% limit), and a finishing drying stage that completes the drying process. This segmentation allows the system to achieve both high productivity and high dehydration strength, overcoming the limitation where increasing production quantity restricts dehydration capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This integrated approach enhances coal quality by overcoming the limitations of separate drying and dry separation methods, reducing investment and production costs, and minimizing energy waste, while improving the efficiency and applicability of coal upgrading techniques.
Implementation Method 1
the hot air flow passing through the gird plate and coal layers from bottom to top exchanges considerable thermal mass with the coal particles so as to allow the free water on the coal particle surface to be evaporated quickly
Implementation Method 2
the hot air system is a heat source portion of the drying system, it comprises a hot air furnace
Implementation Method 3
the hot air flow passing through the gird plate and coal layers from bottom to top exchanges considerable thermal mass with the coal particles
Implementation Method 4
the thin layered coal moves quickly to the discharge end from feeding end on the grid plate with the effect of the vibration machine
Implementation Method 5
according to the working characteristic that the air jigging-based dry separation method uses the air as a media to form air jigging layers in the material to be separated
Data Source
AI summary
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.