There can be many reasons for uneven temperature distribution in the gas generator, which will affect the thermal efficiency and production quality in the furnace. Here are some of the main causes of uneven temperature distribution:

1. Uneven fuel supply: If the fuel (usually coal) is supplied unevenly, it will lead to the formation of uneven combustion areas in the furnace. This may be caused by uneven distribution of pulverized coal, problems with the conveying system, or inconsistent particle sizes of pulverized coal.

2. Insufficient or excessive combustion air: The incorrect ratio of combustion air supply to fuel may lead to uneven temperature distribution. Not enough combustion air can result in incomplete combustion, while too much combustion air can cool the furnace.

3. Furnace structural design issues: The design and shape of the furnace may cause uneven temperature distribution. An unreasonable furnace structure may create combustion dead corners or areas with poor airflow, resulting in uneven temperature distribution.

4. Burner issues: The design and performance of the burner will directly affect the uniformity of combustion. If the burner is improperly arranged or the spout is damaged, uneven temperature distribution may result.

5. Fuel characteristics: Different types of coal have different combustion characteristics. Properties of coal such as ash, sulfur, humidity, and volatile components may cause uneven temperature distribution in the gasifier.

6. Control system problems: Failure or poor performance of the control system may cause the temperature to be unable to be accurately controlled. This includes aspects such as combustion control, fuel supply control, and air supply control.

7. Ash and scale accumulation: After long-term operation, ash and scale may accumulate in the furnace. These substances will affect the conduction of heat and lead to uneven temperature distribution.

In order to solve the problem of uneven temperature distribution, the above factors need to be comprehensively considered and corresponding measures taken. This may include optimizing the fuel supply system, improving the furnace design, maintaining the burner, ensuring the proper operation of the control system, regularly cleaning the dust and scale, etc. Fluid dynamics simulations and thermodynamic analyzes can also be used to optimize the temperature distribution of the gasifier.
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