How to adjust the jacket liquid level and the waste boiler liquid level in a Luchey furnace

How are the liquid levels in the Lurgi furnace jacket and in the waste heat boiler adjusted? In fact, there is a separator at the top of the Lurgi furnace jacket, which functions like a drum. The liquid level in this separator is controlled by regulating the flow rate of boiler water entering the jacket. If the liquid level in the separator is too high, steam may contain water; if it is too low, the safety of the jacket cannot be ensured, as the purpose of having a jacket is to maintain its temperature within a certain range. The level control of the waste pot is similar to that of the jacket liquid level.

The last edit to this post was made by Jiang Chengzi on 2010-9-26 at 08:44. The level of the jacket fluid directly affects the temperature of the steam generated by the jacket, as well as the pressure difference between the gasification furnace and the jacket, which can lead to damage to the gasification furnace equipment. Of course, the liquid level in the waste heat boiler is also intended to lower the temperature of the raw coal gas; if the level is too low, the temperature cannot be reduced, resulting in increased load on the subsequent systems. If the temperature is too low, it can cause ammonium carbonate to crystallize

The analysis upstairs is somewhat inadequate and contains errors; the claim that \"a high level of liquid in the boiler will cause the temperature of the raw gas to be too low, thereby leading to ammonium carbonate crystallization\" is incorrect. Since heat exchange between the waste boiler and the gas occurs indirectly, the gas merely passes through the tubes, so its temperature does not change much (this can be seen from the design temperature of 201 degrees to 187 degrees at the outlet of the waste boiler; even when the liquid level in the upper part of the waste boiler is full, the impact on the gas temperature remains limited, and it is not possible for ammonium carbonate to crystallize, as the crystallization temperature of ammonium carbonate is 58 degrees). Regarding the question posed by the original poster, I think it should be explained as follows: 1. An excessively high level of liquid in the jacket of the Luchi furnace can cause the vaporizing agent to contain water, leading to fluctuations in steam flow and affecting operations; in severe cases, this may result in the formation of peroxides. Too low a value can cause the temperature of the inner jacket to become too high, leading to bulging or leakage. 2. An excessively low level of liquid in the waste boiler can affect the heat exchange efficiency of the raw gas, but it has little impact on the equipment, as the gas temperature remains below 200 degrees ； If it is too high, it will cause water to enter the low-pressure steam system; in severe cases, this can lead to water hammer in the low-pressure steam pipelines. 3. How to adjust? Theoretically, it can be increased directly from 40% to 50%. Considering the objectives and risks associated with such operations, it is generally appropriate to maintain the jacket fluid level between 40% and 50% ； The range within which the waste boiler can be controlled is fairly wide; values between 30 and 60 are not a problem. If, due to differences in coal quality, the gas temperature is relatively high and more heat energy needs to be recovered, it is possible to adjust the control settings to a slightly higher level without any issues.

This post was last edited by Yin Tian on 2010-12-23 22:45 as 12323418u40223tng.

Have you ever thought about it, sir! Does the level of the jacket fluid affect the temperature of the vaporizing agent?

Reply to 7# xjghjdr – The answer is clear: it won’t happen

Reply to 7# xjghjdr- The jacket fluid level is generally used to lower the temperature of the furnace; it does not affect the temperature of the gasifying agent.

I fully agree with the view expressed on floor 4: if the steam generated by the jacket contains water, it will have a negative impact on operations. Excessive water content can cause localized extinguishment of the flame in the gasification furnace, leading to an excess of oxygen. Of course, if the liquid level in the gasification furnace is too low, insufficient heat exchange will result in less steam being produced, which in turn increases subsequent processing costs. The height of the jacket’s liquid level should be determined based on the calorific value of the coal used.