Pulverized Coal Drying System with Temperature Feedback Control
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Solution Overview
Problem
Existing pulverized coal drying systems face challenges in stabilizing the drying process when switching between different types of carbonaceous feedstocks, requiring complex judgments and labor-intensive adjustments of air volume curves, which can lead to errors and inefficiencies.
Innovation Solution
A pulverized coal drying system that controls the flow rate of a drying fluid within set upper and lower limits to maintain a target temperature, eliminating the need for coal-type specific air volume curves and reducing operator error, and includes a temperature setter to adjust the dryness of coal based on moisture content and sulfur conversion ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coal type-specific air volume curves are selected based on operator judgment, then drying performance can be optimized for each coal type, but operator error increases and operation complexity increases when switching between coal types
Solution Approach 1:
The drying system automatically adjusts the air volume flow rate based on real-time temperature feedback from the drying chamber, eliminating the need for manual selection of coal-type-specific curves. The system self-regulates by comparing actual temperature with target temperature and automatically modifying flow rate accordingly
Solution Approach 2:
A temperature sensor continuously monitors the drying chamber temperature and feeds this information back to the flow rate controller, which then adjusts the air volume flow rate to maintain optimal drying conditions regardless of coal type variations
2Manufacturing precision
If multiple coal type-specific air volume curves are maintained, then drying precision for different coal types improves, but device complexity and data management burden increase
Solution Approach 1:
The system employs a universal control algorithm that can handle all coal types through a single unified approach. The flow rate controller uses temperature feedback to adaptively adjust air volume regardless of coal type, making the system multi-functional without requiring separate curves for each coal variety
Solution Approach 2:
The system dynamically changes the air volume flow rate parameter based on real-time temperature conditions rather than relying on static coal-type-specific curves. This allows the system to adapt to different coal characteristics through continuous parameter adjustment rather than pre-programmed data sets
3Manufacturing precision
If manual selection of air volume curves is required during coal type switching, then drying accuracy can be maintained, but time consumption and labor requirements increase
Solution Approach 1:
The temperature feedback control ensures continuous optimal drying performance without interruption during coal type transitions. The system maintains steady drying accuracy by continuously adjusting air volume based on temperature readings, eliminating the downtime associated with manual curve selection
Solution Approach 2:
The manual mechanical process of selecting and switching air volume curves is replaced with an automated electronic feedback control system. The flow rate controller electronically adjusts air volume based on temperature sensor input, eliminating the need for operator intervention during coal type switching
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
The system ensures stable drying of carbonaceous feedstocks regardless of type, reducing labor and error, and optimizing the sulfur recovery process by maintaining consistent dryness and temperature control.
Implementation Method 1
Carbonaceous feedstock (such as coal) is crushed in a crusher and dried at the same time by a fluid (transport gas) supplied to the crusher
Implementation Method 2
dried at the same time by a fluid (transport gas) supplied to the crusher
Data Source
AI summary
An object of the present invention is to provide a pulverized coal drying system for a pulverizer, a pulverized coal drying method therefor, a pulverized coal drying program, a pulverizer, and an integrated gasification combined cycle capable of stably drying a carbonaceous feedstock irrespective of the type of the carbonaceous feedstock to be used. There is provided a controller (50) of a pulverizer (10) that dries a supplied carbonaceous feedstock by using a drying fluid and includes a flow rate controller that controls the flow rate of the drying fluid within upper and lower limits of the flow rate of the drying fluid that are set to dry a plurality of types of the carbonaceous feedstock having different moisture contents in such a way that the temperature of the drying fluid discharged from the pulverizer (10) approaches a target temperature.