Solid Fuel Gasifier Tar Self-Removal Mechanism
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Solution Overview
Problem
Existing solid fuel gasification processes face challenges with tar accumulation, leading to pipeline blockages and environmental pollution, as well as inefficient energy use and high operating costs due to the need for extensive washing and cooling processes.
Innovation Solution
A solid fuel gasification apparatus and method that incorporates a feeder, gasifier, cyclone separator, condenser, condensate evaporator, preheating device, and slag extractor to self-remove tar within the gasifier, utilizing a series of screw dropping devices and porous baffles to repeatedly convert tar into solid coke, eliminating the need for wastewater discharge and optimizing gas quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If extensive washing and cooling processes are used to remove tar, then gas quality is improved, but water consumption increases and wastewater is generated
Solution Approach 1:
The patent extracts and removes tar from the gasification gas through a dedicated tar removal device, separating the tar removal function from the main gasification process. This allows tar to be removed without requiring extensive washing with water, thus improving gas quality while minimizing water consumption and wastewater generation.
Solution Approach 2:
The patent introduces a tar removal device as an intermediary component between the gasifier and the gas cleaning system. This intermediary device specifically targets tar removal through thermal cracking and condensation, avoiding the need for water-based washing processes while maintaining effective gas purification.
2Reliability
If tar is removed through washing and cooling, then pipeline blockages are prevented, but operating cost increases
Solution Approach 1:
The patent converts the harmful tar substance into a beneficial byproduct. The tar removal device not only prevents pipeline blockages but also produces condensed tar that can be collected and utilized as fuel or chemical feedstock, transforming a problematic waste stream into a potential revenue source and reducing operating costs.
Solution Approach 2:
The system achieves self-service by using the heat from the gasification process itself to drive the tar removal mechanism. The hot gas from the gasifier provides the thermal energy needed for tar cracking and condensation, eliminating the need for external energy input and reducing operating costs while maintaining reliable pipeline operation.
3Use of energy by moving object
If tar is combusted to provide heat, then energy efficiency is improved, but tar accumulation in pipelines occurs
Solution Approach 1:
The patent applies preliminary action by removing tar from the gas stream before it can accumulate in pipelines. The tar removal device is positioned upstream to prevent tar deposition, and the system operates continuously to ensure tar is removed proactively rather than reactively after accumulation occurs.
Solution Approach 2:
The patent segments the gasification process into distinct functional zones: gasification, tar removal, and gas cleaning. By separating the tar removal function into a dedicated device with specific temperature and pressure conditions, the system prevents tar accumulation while maintaining energy efficiency through controlled thermal processing.
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 solution effectively prevents pipeline blockages, achieves zero wastewater discharge, improves energy efficiency, and reduces operating costs by continuously converting tar into solid coke, enhancing the quality and calorific value of the gasification gas.
Implementation Method 1
Pyrolysis refers to a series of physical changes and chemical reactions that occur in coal when it is continuously heated to a higher temperature in the absence of air or in inert gases
Implementation Method 2
a condenser 5
Implementation Method 3
a condensate evaporator 8
Implementation Method 4
a preheating device for gasification medium 7
Data Source
AI summary
The present invention relates to an apparatus and a method for solid fuel gasification with tar self-removed within the gasifier, and the apparatus consists essentially of a feeder, a gasifier, a slag extractor, a cyclone separator for gasification gas fly ash or fly ash filter separator, a condenser, a condensate evaporator, a preheating device for gasification medium and a gas holder. Feed the solid fuel into the gasifier through the double sealed feeding valves from the feeding inlet, the solid fuel within the gasifier generates gasification gas, ash and slag after reaction of drying, pyrolysis, gasification and combustion. The present invention provides an apparatus and a method for solid fuel gasification with tar self-removed within the gasifier, which can not only accomplish effective removal of tar and zero discharge of coking wastewater, but also optimize gas quality during the process, improve energy efficiency and reduce operating cost.