Segmented Solids Discharge System for Thermochemical Reactors
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Solution Overview
Problem
The existing technologies for thermochemical conversion of carbonaceous materials face challenges in minimizing pressure drop during solids collection, leading to equipment wear and potential safety hazards due to high-velocity solid particles in reactor systems.
Innovation Solution
A solids discharge system is designed with a partitioned conduit system, isolation valves, and a filter to control gas flow and pressure, reducing the momentum of solid particles and incorporating a computer-controlled operation to manage the discharge process, thereby minimizing equipment wear and ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solids are discharged directly from reactor pressure to atmospheric pressure, then discharge efficiency is improved, but solid particles gain high momentum and cause equipment wear
Solution Approach 1:
The discharge conduit is divided into multiple sections (first section at reactor pressure, second section at intermediate pressure, third section at atmospheric pressure) using isolation valves. This segmentation allows solids to transition through pressure zones gradually, reducing particle velocity and momentum at each stage, thereby minimizing equipment wear while maintaining discharge efficiency
Solution Approach 2:
An intermediate pressure zone is introduced as a mediator between the high-pressure reactor and atmospheric pressure. Solids pass through this intermediate zone where pressure is partially reduced, which diminishes particle momentum before final discharge, thus protecting downstream equipment from abrasive wear
2Reliability
If pressure drop during solids collection is increased, then solids separation is improved, but solid particles accelerate and cause safety hazards
Solution Approach 1:
The pressure drop is segmented into multiple stages across different conduit sections. The first isolation valve separates the high-pressure separation zone from the intermediate-pressure transport zone, allowing effective solids separation to occur at high pressure while subsequent pressure reduction occurs in controlled stages, preventing particle acceleration and safety hazards
Solution Approach 2:
Solids separation is performed preliminarily at high pressure in the first conduit section before pressure reduction occurs in subsequent sections. This preliminary separation ensures effective solids removal while the pressure is still high, and then pressure is gradually reduced in later sections, preventing particles from gaining dangerous velocity
3Productivity
If lock hopper valve arrangements are used for solids removal, then solids discharge capability is improved, but valve seats degrade from solid particle scouring
Solution Approach 1:
The valve system is segmented into multiple isolation valves positioned at different pressure zones along the conduit. This segmentation allows each valve to operate at reduced pressure differentials compared to a single lock hopper valve, significantly reducing the scouring force on valve seats and extending their service life while maintaining overall solids discharge capability
Solution Approach 2:
Intermediate pressure zones act as mediators that reduce the pressure differential across each valve. By introducing intermediate pressure chambers between the reactor and atmospheric discharge, the pressure drop is distributed across multiple valves rather than concentrated at one location, reducing wear on each valve seat
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 system effectively reduces equipment wear and enhances operational safety by slowing down solid particles during discharge, prolonging equipment life and maintaining safe operating conditions.
Implementation Method 1
A filter is in fluid communication with the lower-middle section and configured to prevent solids from leaving the lower-middle section through the gas discharge conduit
Implementation Method 2
A gas supply conduit is in fluid communication with said lower-middle section for introducing a gas into the lower-middle section
Implementation Method 3
A gas discharge conduit is in fluid communication with said lower-middle section for removing a gas from the lower-middle section
Implementation Method 4
The solids transfer conduit is equipped with a first isolation valve, a second isolation valve, and a third isolation valve spaced apart from one another
Data Source
AI summary
A solids discharge system (SDS) is configured to separate solids from product gas. The system includes a solids separation device and at least one solids transfer conduit configured to receive solids from the solids separation device. The solids transfer conduit is selectively partitioned into a plurality of compartments (or “sections”) along its length by isolation valves. A gas supply conduit and a gas discharge conduits are connected to one of the sections to facilitate removal of solids. A filter in fluid communication with that section is configured to prevent solids from passing through the gas discharge conduit so that the solids can be removed from one of the sections of the solids transfer conduit. A product gas generation system incorporates first and second reactors, the latter of which receives products created by the second reactor.