Rotary Distributor Segmentation for RTO Reliability

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Solution Overview

Problem

Regenerative thermal oxidizers (RTOs) face issues with durability and maintenance due to the rotary distributor being prone to shutdowns from pollutants and thermal expansion, leading to inadequate gas purification and potential fires or explosions, with difficult repair or maintenance of the rotary member.

Innovation Solution

A regenerative thermal oxidizer design featuring a compact and robust structure with a rotating middle plate and rail sets to seal gaps and facilitate easy rotation, along with a lubrication system to maintain smooth operation, ensuring effective separation and distribution of gas flows and reducing the risk of breakdowns.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a rotary member with drum shape is used in the distributor, then the gas flow can be separated and distributed, but the rotary member is frequently stopped by pollutants such as dust or due to thermal expansion caused by high temperature

Engineering Contradiction:

Improvedistributor operation continuityVSAvoidpollutant accumulation and thermal expansion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The distributor is divided into multiple independent segments (first distributor, second distributor, third distributor, fourth distributor) arranged around the combustion chamber. Each segment can independently rotate and distribute gas flow, so if one segment is stopped by pollutants or thermal expansion, the other segments continue to operate, maintaining overall system reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs multiple rotary distributors that can rotate independently rather than a single rotary member. This dynamic configuration allows the system to adapt when one distributor is blocked or expanded by heat, as other distributors can compensate by adjusting their rotation or increasing their gas flow capacity.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If a rotary member is used in the distributor, then gas flow separation is achieved, but repair or maintenance of the rotary member is impossible or very difficult when it breaks down

Engineering Contradiction:

Improvegas flow distributionVSAvoidrotary member maintenance

Core Design Contradiction:

Ease of operationVSEase of repair

Solution Approach 1:

The distributor system is segmented into multiple independent rotary distributors, each capable of performing the gas flow separation function. If one distributor breaks down, the other segments remain operational and can be maintained or repaired independently without shutting down the entire system, significantly improving ease of repair.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each rotary distributor is designed as an independent unit with localized functionality. This allows maintenance personnel to access and repair individual distributors without affecting the entire distribution system, making local repairs feasible and efficient while maintaining overall gas flow distribution capability.

Inventive Principle:

Principle #3Local quality

3Reliability

If the polluted gas is burned at high temperature in the combustion chamber, then the VOC is oxidized effectively, but the distributor is damaged or a fire breaks out or an explosion occurs due to thermal expansion

Engineering Contradiction:

ImproveVOC oxidation efficiencyVSAvoidthermal expansion damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The combustion chamber is surrounded by multiple distributors spaced apart, creating separate thermal zones. This segmentation prevents uniform thermal expansion that could damage a single distributor, as each distributor experiences localized thermal conditions and has independent structural support.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The distributors are positioned at specific distances from the combustion chamber and from each other, creating buffer zones that cushion against thermal expansion effects. This beforehand spatial arrangement prevents direct thermal contact damage and reduces the risk of fire or explosion by maintaining safe distances between hot zones and distribution components.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 design enhances durability and maintainability, stabilizes gas distribution, reduces the risk of fires and explosions, and allows for efficient purification of polluted gases while maintaining performance over a long period.

Implementation Method 1

by burning the polluted gas having a relatively high temperature, in a combustion chamber at a high temperature, the VOC is oxidized to carbon dioxide and water

Methodology Applied

Scientific EffectCombustion: Combustion

Implementation Method 2

the VOC is oxidized to carbon dioxide and water

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 3

By allowing the polluted gas to pass through a regenerative material which is ceramic material, the quantity of heat of the polluted gas may be sufficiently utilized

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Data Source

PatentUS9958155B1Regenerative thermal oxidizer

Publication Date: 2018.05.01 EMSOLUTION CO LTD

AI summary

A regenerative thermal oxidizer purifies a polluted gas by oxidizing a volatile organic compound (VOC) contained in the polluted gas at a high temperature by using an amount of heat of the polluted gas.