The problem of intermittent reaction feeding
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In a batch reaction feeding process, high precision is required for the feed accuracy, around 0.1%. Although mass flow meters can be used to achieve this precision, when the total feed volume is small, how can the residual material in the pipeline be controlled once the valve is closed? It won’t affect the accuracy of the overall amount, right?
The feed valve should be placed as close as possible to the base of the equipment; the feed pipe can be connected to the equipment at a 45-degree angle downward, so that no residue remains in the pipe after the valve is closed.
No matter how it’s installed, the material cannot flow down the distance from the flow meter to the control valve, right? The flow meter measures the flow rate, but some of the flow remains between the control valve and the flow meter; once the control valve is closed, nothing can flow down either
This post was last edited by QQ3503226090 on 2016-8-25 at 11:34. 1. The two storage tanks should be as close to each other as possible； 2. The pipeline must never be empty or contain air; if this requirement is not met, devices such as float valves should be used to ensure that the pipeline remains full at all times ； 3. The flow meter is installed in a flag style, with the material flowing from bottom to top ； 4. Pay attention to the backpressure issue. In short, the two key aspects of this issue are: first, gas-free ； II. There is backpressure.
If it cannot be lowered each time, except that it is not allowed on the first attempt, the measurements will be accurate for all subsequent attempts. The points from this session will be carried over to the next one, and those from the next session will be carried over to the one after that.
I’d like to ask, what is the relationship between this and being under pressure? Here, the feed is at atmospheric pressure