【2026 Temperature Control】Temperature control of the gasification furnace
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Temperature control of the gasifier is a key factor in ensuring the efficient and safe operation of the gasification process. Temperature not only directly determines the gas generation efficiency, gas composition, and reaction rate, but it also affects the equipment’s lifespan and operational safety.
The last edit to this post was made by The one on 2026-6-12 at 13:49. Temperature control in a gasification furnace involves several key aspects: First, the adjustment of core process parameters – by changing the ratio and flow rate of the materials fed into the gasification furnace, a dynamic balance of heat is achieved; this is the most fundamental and commonly used method for temperature control. 1. Oxygen-coal ratio/air flow adjustment: Oxygen or air serves as the oxidant in the gasification reaction; increasing the oxygen supply raises the combustion rate and the furnace temperature ； Conversely, it lowers the furnace temperature. In intelligent control systems, multi-variable comprehensive optimization control can be implemented by establishing a correlation model between the oxygen-coal ratio and gasification efficiency.
2. Fuel feed rate adjustment: Changing the rate at which fuel (such as coal powder, biomass, etc.) enters the gasifier allows for direct control of the heat input. It is necessary to ensure that the feed rate matches the air/oxygen flow rate in order to maintain an appropriate air-fuel ratio.
3. Steam flow regulation: Injecting water vapor or atomized water into the furnace allows the latent heat of vaporization of water to be used to absorb heat, thereby effectively reducing the temperature of the gasification layer. At the same time, steam is also an important participant in the vaporization reaction.
4. Fly ash recirculation for temperature control: In a fluidized bed gasifier, when the furnace temperature becomes too high, some of the unreacted fly ash can be sent back into the gasifier through control valves. The heat absorbed by the cold fly ash is used to maintain a stable furnace temperature (for example, within the range of 950°C to 1050°C), thereby preventing the formation of slag at high temperatures.
II. Intelligent Sensing and Advanced Control Systems: With the advancement of automation technology, modern gasification furnaces have evolved from traditional single PID control to intelligent closed-loop control with global coordination. 1. Precise temperature measurement and soft sensing: Due to the extremely harsh conditions inside the furnace (temperatures over 1200°C, high pressure, and corrosive gases), specially designed thermocouples that can withstand high temperatures and corrosion are used and installed at multiple points. At the same time, the AI industrial intelligence suite can establish temporal models through sensor networks to predict temperature trends and perform soft sensing.
2. Advanced Process Control (APC) utilizes real-time data and process models to perform multivariable decoupling and predictive control of the gasifier. The system is capable of automatically handling disruptions caused by external factors such as sudden changes in coal quality or fluctuations in load, significantly reducing the range of fluctuations in key parameters and enabling the device to operate in \"auto-pilot\" mode.
3. Optimization using AI large models and knowledge graphs: To address the issue of complex and variable characteristics of raw materials such as biomass, artificial intelligence (such as the DeepSeek model) is employed. By constructing a knowledge graph in the field of gasification and combining it with reinforcement learning, AI models can predict and generate optimal control strategies based on real-time operating conditions, dynamically adjusting the heating power, cooling system, and feed rate to overcome the problem of poor adaptability associated with traditional algorithms.
III. Temperature characteristics and control boundaries of different furnace types: Different types of gasification furnaces have specific temperature characteristics, and control strategies must be adapted to the specific conditions. 1. Fixed-bed: The peak temperature is usually between 900–1000°C. The key to control lies in maintaining a high temperature without exceeding the ash melting point of the coal, in order to prevent slag formation and reduce residual carbon in the slag.
2. Fluidized bed: The typical temperature range is 700–900°C, and the uniformity and stability of the bed temperature are often maintained through methods such as fly ash recirculation.
3. Fluidized bed: A high temperature of 1400–1700°C is required to melt the ash. However, the operating temperature is generally recommended to be strictly kept below 1350°C, as above 1400°C, the penetration and corrosive effects of cinder on the refractory brick lining increase exponentially.