How to prevent blockage of the negative pressure pipe in the niacin pump tank
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Hello everyone: How can we prevent the negative-pressure pipes in the nicotinic acid pump tank from getting clogged? During production, acid sludge (formed by the condensation of SO3) often accumulates inside these negative-pressure pipes, causing blockages and resulting in heavy smoke emanating from the pump tank
Regular cleaning and maintenance can be carried out to keep the inside of the pipes clean； Use a filtering device to prevent solid particles from entering the pipes ； Optimize pipeline design to reduce dead zones and fast-flow areas within the pipes ； Use appropriate pipe materials to reduce the adhesion of acid sludge ； Use a heating device to maintain the pipe temperature and prevent SO3 from condensing. At the same time, inspect and improve the ventilation system to reduce smoke generation. .
Metal materials are not recommended for the vapor line in pump chambers, as they are prone to corrosion by condensed acids and the formation of sulfates.
The negative pressure pipeline is made of fluorinated-lined pipes; this is especially true at the connection points with the tank, where metal pipes are prone to corrosion and the resulting acid sludge can cause blockages – this is a common problem. When using insulated negative-pressure pipelines, attention should be paid to the steam temperature.
Solution: 1. Design a negative-pressure pipeline and maximize its inclination angle to facilitate the return of the condensed liquid to the circulation tank； 2. The pipe lining is F4; the elbows are set at 45°, and as many elbows as possible should be avoided during installation on site. The inside of the molded elbow must be smooth ； 3. Maximize the pipe diameter as much as possible ； 4. Develop an automatic temperature-controlled electric heating control system ；
Solution: 1. Design a negative-pressure pipeline, maximize the inclination angle of this pipeline, increase the number of support points along the pipeline to prevent bending, and facilitate the return of the condensed liquid to the circulation tank or vessel； 2. The pipe lining is F4; the elbows are set at 45°, and as many elbows as possible should be avoided during installation on site. The inside of the molded elbow must be smooth ； 3. Maximize the pipe diameter as much as possible ； 4. Develop an automatic temperature-controlled electric heating control system ； Maintain a temperature above 35°C
It is mainly necessary to isolate humid air!
1. Add heat tracing to maintain a temperature of around 60°C. 2. Blockages in the negative-pressure pipes can be detected; these can be cleaned with water, but it is necessary to blow out any remaining water after cleaning. 3. When installing the pipes, use ones with a larger diameter to reduce the number of bends; try to use bends at 45° angles, as this helps prevent condensation from flowing back. 4. The overflow pipes between the tanks can be connected to each other, which prevents one tank from getting clogged; it is possible to connect to another tank in a timely manner, thus delaying the detection of problems. 5. The higher the concentration of nicotinic acid, the more likely it is that blockages will occur
For this type of acid-side scaling, whether it is sulfate or silicate, our company’s microwave scaling prevention and removal equipment can effectively prevent scaling. It has been successfully applied in sulfuric acid plant installations, and it should be able to solve your problem. Interested in adding on WeChat: TigerPeng2014.