What is the performance of the level gauge in the liquid level tank of the low-pressure ammonium methoxide condenser for (CO2-stripped urea)?
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The liquid level tank of the low-pressure ammonium methoxide condenser in our CO2 stripping urea plant is equipped with a double-flange level gauge, which often provides inaccurate readings, causing many difficulties in operation. May I ask: How is this level gauge being used by all of you in the marine industry? What type of level gauge is it? Please discuss this.
Apply purge steam or flushing fluid at the root
We use medium-pressure steam, 0.8 MPa
Add a small jacket for insulation to the short neck at the top and bottom.
The level gauges for the low-pressure methamine condenser in the carbon dioxide stripping process are generally designed as double-flange level gauges. Inaccurate readings are often caused by crystallization; the solution, as mentioned above, is to maintain an appropriate temperature for the level gauge in order to prevent crystallization. A radiation source level gauge can also be used; it provides accurate readings, but is expensive.
Our unit’s new system features sight glasses installed through openings in the equipment itself! It works well! The old system was designed with a double-flange level gauge, whose readings were not very accurate. Currently, a radiation-based level gauge is being used; it provides accurate readings, but it is costly and poses certain safety risks. :handshake
A sight glass should be installed on the equipment; it’s best to use a probe so that the liquid level in the low-temperature cooler can be viewed from the control room. The double-flange level gauge can be insulated with steam tracing, with steam being used for local heating as well – this dual approach should ensure no problems.
If a viewfinder is added and a probe is used, this method still works indeed. But the problem that arises is: it’s troublesome if the view mirror breaks! With increasingly strict safety and environmental regulations, this is the most troublesome issue! It is understood that in many original aqueous urea plants, the sight glasses in the first and second division towers were damaged; nowadays, they are basically all blocked with stainless steel blind plates.
Steam or electric heating can be used for the level gauge to prevent crystallization.
The last edit to this post was made by sxlhz on 2009-7-27 00:07. The main reason for inaccurate readings under normal conditions (without considering equipment selection) is \"blockage\" and inadequate insulation； It’s best to implement various measures simultaneously, using multiple approaches!
11# lxq700918 1. Connect a short pipe with a jacket for steam insulation. 2. Add another tube to rinse it when the water crystallizes. 3. Once both of these are done, the problem will be solved. Hehe
It’s better not to install on-site glass mirrors; it’s too dangerous. The liquid level tank of the low-pressure ammonium methoxide condenser, when using a dual-method approach (with proper insulation and heating), should be able to meet the production requirements; it is better not to use radiation-based level gauges in this area.
Why isn’t anyone continuing the discussion? Is it easy to crystallize when using an insert type as well?
Our design doesn’t have any flushing water or flushing rings – so what should we do? .
A double flange will do; consider the insertion depth, and ensure proper insulation is in place. There usually won’t be any problems.
For a complete solution, we use a high-pressure metering pump to deliver a very low flow rate of the appropriate fluid at the base of the level gauge, thereby allowing external liquid to enter the interior and maintaining circulation there; as a result, the level gauge never stops working properly. You can give it a try
This type of level gauge generally uses a double-flange differential pressure level gauge, with a 316L diaphragm and silicone oil for pressure transmission. Additionally, flanged connections are used at the liquid level gauge ports of the equipment to prevent clogging due to crystallization.
Double-flange level gauges are quite useful; it’s important to check and clean them whenever there’s a chance to do so. Additionally, the material grade must be high, as the diaphragms in double-flange gauges tend to corrode and get damaged quite often.