What are the causes of fluctuations in the pressure difference at the slag outlet of the gasifier?

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Firstly, the type of coal is a key factor; if the coal has poor viscosity-temperature properties, high ash content, a high ash fusion point, and poor fluidity, then a low furnace temperature in the gasification furnace or large temperature fluctuations can both lead to variations in the pressure difference at the slag outlet. Furthermore, the level of the liquid in the gasifier and blockages at the syngas outlet also have a certain impact on the pressure difference at the slag outlet. This requires comprehensive judgment; generally, it is possible to determine whether the slag outlet is blocked by comparing the shape of the slag. If the slag outlet pressure difference rises rapidly, increasing the operating temperature, appropriately raising the central oxygen level, reducing the load, or switching to coal with a lower ash melting point can all be effective solutions.

What is the typical level of methane at the outlet of the vaporization furnace in your facility??

Currently below 400PPm

1. What the original poster mentioned is correct: using De’s method increases the oxygen concentration at the center, which lengthens the flame and raises the temperature at the slag outlet, thereby improving the fluidity of the slag. There is no problem with this. But this is valid only if it is confirmed that the low-temperature slag outlet is blocked; if it is the high-temperature slag outlet that is blocked, it will have the opposite effect. The blockage becomes even worse, and at the same time the furnace walls experience severe temperature changes. 2. The synthesis gas pipeline is blocked, definitely due to the presence of water and ash. Increasing the flow rate of the quench water is no problem. When the furnace load, pressure, temperature, oxygen-coal ratio, and central oxygen level cannot be adjusted, it is possible to increase or decrease the liquid level in the quenching chamber: if ash accumulation is severe at a high liquid level, reduce it; if ash accumulation is severe at a low liquid level, increase it. Ensuring the quality of graywater, reducing furnace temperature, decreasing load, increasing central oxygen levels, and maintaining an appropriate slag port pressure difference – all these measures can help reduce the presence of water and ash. 3. Poor slag discharge from the quenching chamber leads to blockages at the inlet of the grouping bins; bridge-like slag accumulation occurs within the quenching chamber ； Poor slag discharge in the lock hopper; malfunction of the programmable valve. Both of these will cause gray streaks. Generally, a group fight cycle lasts 30 minutes, and I don’t think the frequency of waste removal will increase based on this. Increasing the cycle is possible. If slag discharge from the quenching chamber is poor, this issue can be resolved by reversing the rotation of the slag breaker and inducing backflow in the quenching chamber, thereby improving the situation with regard to ash presence ； The programmable valve for locking is broken; stop the group fighting and carry out repairs promptly. At the same time, increase the feed to the vaporization furnace, reduce the load, raise the furnace temperature appropriately, and implement backflushing (to avoid compression at the bottom).