Tar Gas Washing Liquid Extraction Before Cooling to Prevent Clogging

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Solution Overview

Problem

Existing gasification systems face issues with tar clogging in cooling equipment due to the high solubility of tar in cooling liquids, leading to operational reliability and efficiency problems, despite the use of extraction agents, which are inefficient and require large amounts to compensate for incomplete separation.

Innovation Solution

A method and system where an extractant is added to the tar-containing washing liquid before cooling, providing high residence time and contact area, followed by cooling and separation, reducing the solubility of tar and minimizing clogging risk through continuous cleaning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the cooling liquid is cooled down to improve gas cooling efficiency, then the gas production efficiency is improved, but the tar solubility increases causing tar to harden and clog the cooling equipment

Engineering Contradiction:

Improvegas production efficiencyVSAvoidcooling equipment reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

An extractant is added to the cooling liquid before it enters the cooling equipment, in advance preventing tar from hardening and clogging the equipment. This preliminary protective action ensures the cooling liquid can be cooled effectively without causing reliability issues.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

An extractant substance is introduced as an intermediary between the tar-containing cooling liquid and the cooling equipment. This extractant binds to tar compounds, preventing them from depositing on equipment surfaces while allowing the cooling process to proceed efficiently.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If an extractant is added to the cooling liquid to prevent tar clogging, then the reliability is improved, but the extractant consumption increases due to incomplete separation

Engineering Contradiction:

Improvecooling system reliabilityVSAvoidextractant consumption

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The extractant is continuously added to the cooling liquid in a continuous flow system, ensuring constant protection against tar clogging. This continuous action maintains reliable operation while optimizing extractant utilization through steady-state conditions.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The system is designed so that the extractant automatically performs its function of preventing tar deposition without requiring additional intervention. The cooling liquid itself carries the extractant to where it is needed, and the system maintains extractant concentration through continuous addition and circulation.

Inventive Principle:

Principle #25Self-service

3Quantity of substance

If the extractant is added after the cooling liquid contacts the gas, then the extraction efficiency is reduced due to high temperature, but adding it before cooling increases extractant consumption

Engineering Contradiction:

Improveextractant efficiencyVSAvoidextractant quantity required

Core Design Contradiction:

Quantity of substanceVSLoss of substance

Solution Approach 1:

The extractant is added to the cooling liquid before the cooling process begins, when the liquid is still at higher temperature. This preliminary addition ensures the extractant is present and active during the entire cooling process, maximizing tar extraction efficiency while using optimized quantities.

Inventive Principle:

Principle #10Preliminary action

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 approach enhances tar extraction efficiency, reduces extractant consumption, and prevents clogging, ensuring reliable and cost-effective operation of gasification systems by maintaining a high energy content in the synthesis gas.

Implementation Method 1

adding an extractant to the tar containing washing liquid to obtain an extraction liquid comprising a tar containing extractant and a regenerated washing liquid

Methodology Applied

Scientific EffectExtraction: Liquid-Liquid Extraction

Implementation Method 2

cooling the extraction liquid; reducing the solubility of tar and minimizing clogging risk

Methodology Applied

Scientific EffectCooling: Cooling

Implementation Method 3

separating the tar containing extractant from the regenerated washing liquid

Methodology Applied

Scientific EffectDensity gradient separation: Density Gradient

Data Source

PatentUS12552993B2Purification of tar containing gas streams

Publication Date: 2026.02.17 MEVA ENERGY

AI summary

The present invention relates to a method for purifying a tar containing gas stream. The method comprises the steps of:a) contacting a tar containing gas stream with a washing liquid in a washing unit to obtain a tar containing washing liquid and a purified gas stream;b) adding an extractant to the tar containing washing liquid to obtain an extraction liquid comprising a tar containing extractant and a regenerated washing liquid;c) cooling the extraction liquid;d) after cooling, separating the tar containing extractant from the regenerated washing liquid, ande) recirculating the regenerated washing liquid to the washing unit.