Oxygen mains temperature drops

It depends on whether your oxygen flow regulating valve is in the automatic position. If so, it will have little effect. However, if it is in the manual position, the oxygen flow rate of each burner will be reduced by 200-300Nm3, which will affect the furnace temperature.

It has little impact on gasification, but you need to pay attention to air separation.

The flow rate of oxygen is closely related to its pressure and temperature. Once the oxygen temperature drops, its flow rate will also drop, which will cause the temperature of the gasifier to drop. In severe cases, it will affect gas production and even block the slag port, affecting normal and stable operation.

We have no effect on gasification. You know, your oxygen flow rate does not have pressure and temperature correction. The temperature of the oxygen pipeline should not be lower than -20 degrees. It is just for the safety of the air separation oxygen pipeline. It is usually above 5 degrees.

Temperature and pressure compensation only makes the measurement more accurate rather than making the control more precise. When the opening of the regulating valve is constant, the volume flow rate passing through it remains basically unchanged. As the oxygen temperature decreases, the result of temperature and pressure compensation is that the oxygen flow rate decreases. The consequences have been described by many people before.

You are right, but if the oxygen flow rate is set to automatic, for example, set to 1200Nm3, then if the temperature changes, the valve opening will be automatically adjusted with temperature and pressure compensation.

Temperature and pressure compensation only makes the measurement more accurate rather than making the control more precise. When the opening of the regulating valve is constant, the volume flow rate passing through it remains basically unchanged. This is indeed the case. If the oxygen flow is set to automatic, then if the temperature changes, with temperature and pressure compensation, the valve opening will be automatically adjusted. However, most manufacturers use manual control, so in normal operation, the oxygen temperature should not be too low and should be more stable!

This post was edited by GSP on 2010-9-15 12:46 with some comments for reference only.: 1. In order to ensure the furnace temperature, the amount of oxygen will increase, or the coal-to-coal ratio will increase, which will increase the consumption of unit synthesis gas (it depends on whether the air separation can be guaranteed) ； In addition, the CO2 content in the synthesis gas increases. Gasification efficiency is reduced. 2. If the coal-to-coal ratio is kept unchanged, the furnace temperature will decrease, the carbon content in the slag or ash will increase, the coal conversion rate will decrease, the steam production will decrease, etc. 3. If a mixture of oxygen and steam is used as the oxidant, another problem that needs attention is that the oxygen temperature decreases, which may make the mixing temperature of the oxidant close to the dew point temperature. Attention needs to be paid to the material selection of all pipelines related to the oxidant to prevent Cl stress corrosion (CSCC).

What was said above is correct. Temperature and pressure compensation is indeed not advisable. I thought about it too. The temperature of oxygen still has an impact on the gasifier, but not much. Our operation is to reduce oxygen during the day and add oxygen at night.