Gas Recirculation Device with Bypass Venturi Mixing
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Solution Overview
Problem
Current gas recirculation systems in combustion and gasification processes face limitations in adjusting flow rates and pressures dynamically, particularly when dealing with high temperatures, which can lead to equipment overheating, fouling, and inefficiencies in energy recovery, as traditional draft fans and heat exchangers are not adaptable to complex circulation patterns and are prone to clogging or damage.
Innovation Solution
A gas recirculation device with a main pipe and a bypass circuit incorporating heat exchange and pressurization means, utilizing a Venturi mixing system to control flow rates and pressures independently, allowing for partial gas recirculation and purification, thereby protecting equipment from excessive temperatures and minimizing installation size by pressurizing a smaller flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a draft fan is placed downstream of filtration or chemical treatment equipment to compensate for pressure loss, then the flow of flue gases can be ensured from boiler to chimney, but the pressure and flow rate evolution in the flue gas circuit cannot be adjusted punctually during use
Solution Approach 1:
The invention divides the flue gas circuit into multiple independent zones by inserting a bypass circuit with its own pressurization device. This segmentation allows each zone (main circuit and bypass circuit) to have independent pressure and flow rate control, enabling punctual adjustment during operation while maintaining overall productivity.
Solution Approach 2:
The invention introduces dynamic control capabilities by equipping the bypass circuit with a pressurization device that can independently adjust pressure and flow rate. This transforms the static pressure compensation system into a dynamic system where parameters can be modified punctually during operation to adapt to varying operational requirements.
2Adaptability or versatility
If a pressurization device is placed in line to raise the pressure of the gas flow, then the flow rate and pressure can be controlled, but the whole flow of gas must be treated which imposes expensive dimensioning and risks fouling or overheating
Solution Approach 1:
The invention applies partial action by directing the pressurization device to treat only a portion of the gas flow through the bypass circuit, rather than the entire main flow. This partial treatment reduces the sizing requirements and cost of the pressurization device while still achieving the desired flow rate and pressure control through the combination of main and bypass circuits.
Solution Approach 2:
The bypass circuit acts as an intermediary pathway that allows localized pressure and flow rate control without requiring the main circuit to be redesigned. The pressurization device in the bypass circuit serves as a mediator that achieves control objectives without exposing the entire gas flow to potentially harmful conditions.
3Temperature
If heat exchange means are used to cool high temperature gases, then the temperature can be reduced to protect equipment, but the equipment must be made of expensive refractory material
Solution Approach 1:
The invention changes the temperature parameter gradually by using the bypass circuit with heat exchange means to cool a portion of the gas flow. This partial cooling approach allows the use of less expensive materials compared to cooling the entire high-temperature flow, as the heat exchanger only needs to handle a fraction of the total thermal load.
4Adaptability or versatility
If the entire gas flow is treated by a pressurization device, then pressure and flow rate control is achieved, but the installation becomes expensive and complex
Solution Approach 1:
The invention treats only a partial volume of gas through the bypass circuit with the pressurization device, rather than the entire main flow. This partial treatment significantly reduces the quantity of gas that needs to be handled by the pressurization device, leading to smaller, less expensive installation dimensions while maintaining effective control capability.
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
Enables localized control of gas flow rates and pressures, reduces equipment stress, minimizes installation costs, and allows for efficient cooling and treatment of gases without exposing critical components to extreme temperatures, enhancing operational safety and efficiency.
Implementation Method 1
said mixing means comprising a Venturi
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a gas recirculation device (1) comprising a main pipe (21, 23, 24, 25), known as the main gas flow pipe, including a mixing means (3) defining the downstream portion (24, 25) and the upstream portion (21) of the main gas flow pipe (21, 23, 24, 25), and a bypass circuit (3, 5), known as the diverted flow circuit, comprising a heat exchange means (11), said mixing means (6, 23) comprising a first inlet connected to the upstream portion (21) of the main gas flow pipe (21, 23, 24, 25), a second inlet connected to one end of the bypass circuit (3, 5), and an outlet connected to the downstream portion (24, 25) of the main gas flow pipe (21, 23, 24, 25), and the other end of the bypass circuit (3, 5) being connected to the downstream portion (24, 25) of the main gas flow pipe (21, 23, 24, 25) at a point known as the first bypass point (25).