Gasification Reactor Oil Lance Co-Feeding
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Solution Overview
Problem
Existing gasification processes face inefficiencies when using a mixture of carbonaceous feeds, particularly when coal is replaced by biomass, leading to decreased thermal efficiency and challenges in co-processing different types of feeds without reducing production efficiency.
Innovation Solution
The process involves co-feeding oil through separate oil lances into the combustion chamber of a gasification reactor, using a coaxial atomizing nozzle arrangement for oil and steam, which improves reactor productivity by enhancing combustion efficiency, even when up to 30% of the coal is replaced by biomass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If biomass is used to replace part of the coal in the gasification process, then environmental sustainability and feedstock versatility are improved, but thermal efficiency and reactor productivity deteriorate due to the lower heating value of biomass
Solution Approach 1:
The patent combines multiple carbonaceous feeds (biomass and coal) and adds oil as a supplementary fuel source through separate oil lances. This merging of different feedstocks with complementary properties allows the system to maintain high productivity while using renewable biomass, as the oil and coal compensate for the lower heating value of biomass.
Solution Approach 2:
The patent changes the fuel composition parameters by introducing oil through separate oil lances with specific oil-to-steam ratios. This parameter adjustment allows optimization of the overall heating value and combustion characteristics, compensating for the lower energy density of biomass while maintaining reactor productivity.
2Productivity
If oil is introduced through separate oil lances to improve reactor productivity, then thermal efficiency and production rate are improved, but device complexity and risk of thermal damage to oil lances increase
Solution Approach 1:
The patent segments the fuel introduction system by using separate oil lances distinct from the coal burners. This segmentation allows independent control and optimization of oil feeding, enabling improved productivity through additional fuel input while maintaining separate control systems that manage the increased device complexity.
Solution Approach 2:
The patent introduces steam as an intermediary substance that serves multiple functions: it atomizes the oil for better combustion efficiency, provides cooling to protect the oil lances from thermal damage, and facilitates the introduction of oil into the high-temperature combustion zone without directly exposing the lance structure to extreme temperatures.
3Use of energy by moving object
If oil is atomized using steam in a coaxial arrangement, then combustion efficiency is improved, but the system requires additional cooling mechanisms to protect the oil lances from thermal damage
Solution Approach 1:
The patent makes the steam serving the oil atomization function also serve as a cooling medium for the oil lances. The steam injected coaxially with the oil performs dual functions: atomizing the oil droplets for improved combustion efficiency and providing thermal protection to the lance structure, thereby eliminating the need for separate cooling mechanisms.
Solution Approach 2:
The system uses the steam already required for oil atomization to simultaneously provide cooling protection to the oil lances. The steam flow that is necessary for breaking up the oil into fine droplets also serves to cool the lance structure, making the system self-sufficient and eliminating additional cooling infrastructure.
Data Source
Figure 1~2
Figure 3
AI summary
Gasification reactor (1) and process for the production of synthesis gas by partial combustion of a carbonaceous feed. The reactor comprises a reactor chamber (2) with one or more burners (4) and at least one oil lance(8) extending into the reactor chamber. The oil lances (8) can for instance be located at a level 1,5 meters or less below or above the burners(4).