Daily Question: [2011.5.17] At the locations where coal slurry samples are taken, does blockage occur frequently?
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At the sampling points for slurry analysis, does blockage occur frequently?
This post was last edited by jensse on 2013-1-5 at 11:35. Yes, the solutions are as follows: 1. The slurry sampling valve should not be installed at the vertically lower part of the pipeline； 2. Installed at the top of the pipeline, with as short a root section as possible ； 3. An L-type ball valve is used, with the outlet angled downward at 30 degrees to the horizontal direction. 4. After 30 degrees, bend downward at 60 degrees. It can resolve sampling blockages and prevent slurry from splashing out
This post was last edited and replied to by jensse on 2013-1-5 at 11:36. Reply 1# wlq1970: Yes, the analysis sampling valve used is a ball valve, and clogging often occurs. However, the problem of blockage in the analysis sampling valve can be resolved through the following measures: 1. The slurry sampling valve should not be installed at the vertically lower part of the pipeline ； 2. Installed at the top of the pipeline, with as short a root section as possible ； 3. Use an L-type ball valve, with the outlet angled downward at 30 degrees to the horizontal direction ； 4. After 30 degrees, bend downward at 60 degrees.
This post was last edited and replied to by jensse on 2013-1-5 at 11:36. Reply 1#: wlq1970 – It is advisable to use ball valves or plug valves for sampling; the specific methods are outlined in GB/T 18856.1-2002, Test Methods for Quality of Water-Coal Slurry
Reply 1# wlq1970: The sampling points for slurry analysis are located at the pre-drain locations of the small slurry pump and the large slurry pump, and blockages occur there frequently~~~~
We arrange it this way: one is placed before the pump and one after it, that is, at the high-pressure and low-pressure areas respectively. The sampling ports are usually located on the side of horizontal pipes; we use upper openings for this purpose, but it’s better to use openings on vertical pipes. The distance between the main pipe and the sampling valve should be as short as possible, and it’s best to use welded valves, which helps to reduce the risk of blockages
Blockages are inevitable; in fact, it is sufficient to ensure the quality of the coal slurry at the outlet of the coal grinder – there is no need to analyze the coal slurry tank.
Reply to 9# qihuajingling: Haha, you’re absolutely right. The best solution is to use a large coal slurry tank, which would allow for reduced or even no need for analysis. But how can this be achieved? People can look into online monitoring of concentration, viscosity, etc.; I believe this can help to avoid blockages as much as possible.
It gets clogged frequently, but a reverse purge device can be installed
Reply to 6# yangzhi5114: Our factory is also in this location; basically, we have to puncture it every time we take samples
Basically, it’s all rinsed before import! Everyone can just take it from the top of the small slot! Be careful!