Supercritical Hydrothermal Combustion Device Ignition Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Supercritical hydrothermal combustion technologies face challenges with stable ignition and heat loss due to salt deposition and corrosion, particularly in traditional steam injection boilers used for heavy oil recovery, which limits their efficiency and applicability.
Innovation Solution
A supercritical hydrothermal combustion device with a partitioned main shell and top cap design, featuring a high-temperature ignition bar, vortex wall cooling, and pressure auto-regulation, allows for stable ignition and heat transfer, reducing salt deposition and corrosion, and optimizing fuel flow rates to maintain a stable hydrothermal flame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If thermal spontaneous ignition is used in existing supercritical hydrothermal reactors, then the reaction can proceed with simple equipment, but fuels and oxidants must be heated to high temperature before entering the reactor, which increases the probability of ignition failure due to blockage from inorganic salt precipitation
Solution Approach 1:
The patent applies preliminary action by pre-heating fuels and oxidants in a pre-heating chamber before they enter the main reaction chamber. This preliminary heating ensures that materials reach the required temperature for spontaneous ignition, preventing ignition failure while avoiding blockage issues by controlling the heating process before reaction occurs.
Solution Approach 2:
The patent introduces an intermediary heating chamber that acts as a mediator between the fuel/oxidant supply and the main reaction chamber. This intermediate space allows controlled pre-heating and mixing, ensuring stable ignition conditions are achieved before materials enter the high-temperature reaction zone, thereby improving ignition reliability without complicating the overall system design.
2Temperature
If steam injection boilers are used for heavy oil thermal recovery, then heavy oil can be heated to reduce viscosity, but severe heat losses occur (total heat loss may reach 50%) and large areas are occupied
Solution Approach 1:
The patent replaces the traditional mechanical steam injection system with a supercritical hydrothermal combustion system. This substitution eliminates the need for external steam generation and injection infrastructure, achieving heavy oil heating directly through controlled combustion reactions, thereby dramatically reducing heat losses from steam generation and pipeline transmission.
Solution Approach 2:
The patent changes the thermal processing parameters by operating in the supercritical state rather than subcritical steam conditions. This parameter change allows for more efficient heat transfer and energy utilization, reducing the 50% heat loss associated with traditional steam injection while achieving the required heavy oil heating temperatures for viscosity reduction.
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 device ensures stable ignition and combustion, reduces heat loss, prevents salt deposition and corrosion, and allows for efficient energy recovery, making it suitable for organic waste treatment and heavy oil thermal recovery with reduced operational costs.
Implementation Method 1
a high-temperature ignition bar is disposed in the high-temperature ignition bar sleeve... a portion, located in the stable combustion space A1, of the high-temperature ignition bar is at high temperature to realize forced ignition
Implementation Method 2
a vortex wall cooling water channel is formed between an outer surface of the vortex wall and an inner wall of the combustion sleeve, a vortex wall cooling water inlet of the vortex wall cooling water channel is located in the top cap
Implementation Method 3
Supercritical hydrothermal combustion is a new combustion technology for generating hydrothermal flames by means of intense oxidization reaction between organic matter with a certain concentration and oxidants in supercritical water
Implementation Method 4
intense oxidization reaction between organic matter with a certain concentration and oxidants in supercritical water
Implementation Method 5
a pressure regulation rod capable of moving in an axial direction is mounted in the pressure regulation device shell through axial pressure regulation springs
Data Source
AI summary
A supercritical hydrothermal combustion device comprises a main enclosure and a top cap. A partition is mounted in the main enclosure and divides the interior of the main enclosure into a main combustion space and a mixing space. The top cap is provided with a primary fuel inlet, an oxidant inlet and a secondary fuel inlet. A high-temperature ignition bar sleeve, having a high-temperature ignition bar arranged therein, is disposed in the top cap. A combustion sleeve, having a stable combustion space formed therein, is mounted at a bottom of the top cap, and has a top communicated with the high-temperature ignition bar sleeve and the oxidant inlet, as well as a bottom communicated with the main combustion space. The secondary fuel inlet and a secondary oxidant inlet are communicated with the main combustion space. Supercritical hydrothermal combustion is realized to generate a hybrid thermal fluid or treat organic wastes.