Pyrolysis Gas Line Oxygen Injection for Deposit Prevention

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Solution Overview

Problem

Conventional pyrolysis gasification systems require periodic shutdowns for cleaning due to pyrolysis deposit accumulation, leading to maintenance challenges and inefficiencies, as existing methods for deposit removal are not capable of continuous operation.

Innovation Solution

Incorporating an oxygen-containing gas with a high concentration into the pyrolysis gas stream within the pyrolysis gasification system to form a high-temperature flame that pyrolyzes and decomposes pyrolysis components, thereby inhibiting deposit formation and allowing continuous operation without shutdowns.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the pyrolysis gasification system operates continuously without cleaning, then productivity is maintained, but pyrolysis deposit accumulates causing pipe blockage and system failure

Engineering Contradiction:

Improvecontinuous operation timeVSAvoidpipe blockage risk

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by injecting oxygen-containing gas into the pyrolysis gas line before deposit accumulation reaches critical levels. This preventive measure continuously burns off tar and pyrolysis components, preventing deposit formation that would otherwise lead to pipe blockage and system shutdown

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements continuity of useful action by maintaining continuous operation of the pyrolysis gasification system through ongoing injection of oxygen-containing gas. This continuous preventive treatment eliminates the need for periodic shutdowns for cleaning, keeping the system in constant productive operation

Inventive Principle:

Principle #20Continuity of useful action

2Reliability

If the system is shut down for cleaning, then pyrolysis deposit is removed, but productivity is reduced due to maintenance downtime

Engineering Contradiction:

Improvedeposit removal effectivenessVSAvoidmaintenance downtime

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies self-service by enabling the pyrolysis gasification system to clean itself through in-situ burning of deposits. The oxygen-containing gas injection creates a self-cleaning mechanism where tar and pyrolysis components are continuously combusted within the system, eliminating the need for external manual cleaning operations and associated shutdowns

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent maintains continuous productive operation by replacing periodic cleaning shutdowns with continuous in-situ burning. The useful action of deposit removal occurs concurrently with system operation, eliminating downtime while maintaining reliability through ongoing deposit management

Inventive Principle:

Principle #20Continuity of useful action

3Reliability

If oxygen-containing gas is injected into the pyrolysis gas line, then pyrolysis deposit is decomposed, but additional energy consumption occurs

Engineering Contradiction:

Improvedeposit decomposition effectivenessVSAvoidoxygen-containing gas injection energy

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent converts the harmful pyrolysis deposit into a beneficial heat source through controlled combustion. By injecting oxygen-containing gas, the accumulated tar and pyrolysis components burn exothermically, generating heat that maintains system temperature and potentially reduces external energy requirements for pyrolysis

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent uses oxygen-containing gas as a strong oxidant to accelerate the decomposition of pyrolysis deposits. The injected oxygen promotes rapid combustion of tar and organic components, efficiently converting them to gaseous products and preventing deposit accumulation with minimal energy input

Inventive Principle:

Principle #38Strong oxidants (Accelerated oxidation)

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 effectively prevents pyrolysis deposit accumulation, reducing maintenance frequency and ensuring efficient operation by continuously burning and decomposing tar and other components, thus preventing pipe blockages and maintaining system balance.

Implementation Method 1

gas having a high temperature formed by mixing the oxygen-containing gas with the pyrolysis gas pyrolyzes and decomposes pyrolysis components

Methodology Applied

Scientific EffectPyrolysis: Pyrolysis

Implementation Method 2

pyrolyzes and decomposes pyrolysis components

Methodology Applied

Scientific EffectDecomposition: Decomposition (biological)

Implementation Method 3

burning and decomposing tar and other components

Methodology Applied

Scientific EffectCombustion: Combustion

Data Source

PatentUS10377952B2Method for inhibiting occurrence of pyrolysis deposit in pyrolysis gasification system, and pyrolysis gasification system

Publication Date: 2019.08.13 MITSUBISHI HEAVY IND ENVIRONMENTAL & CHEM ENG CO LTD

AI summary

This method for inhibiting the occurrence of a pyrolysis deposit in a pyrolysis gasification system includes: gasifying biomass (S2) through pyrolysis in a pyrolysis gasification furnace (5); separating, in a solid-gas separation unit (7), a pyrolysis gas (G1) and a carbide (C) continuously formed through pyrolysis of the biomass (S2); feeding an oxygen-containing gas (G3) to the separated pyrolysis gas (G1); and introducing the pyrolysis gas (G1) together with the oxygen-containing gas (G3) to a combustion furnace (6) through a pipe (9) which constitutes a pyrolysis gas line (8).