There are many different ways to get rid of waste without leaking harmful products into the environment. Among today’s most popular methods is pneumatic conveying, a process which was first introduced in Stockholm, Sweden on a large scale as a public waste service. This type of solid waste movement has long been popular within the chemical industry, and we will take a look at the process a little bit closer in this article.
Pneumatic conveying
Pneumatic conveying specifically refers to a process by which solids are moved by a gas stream through pipes, which can either be horizontal or vertical. The solids themselves may be suspended in the gas, if they are small particles, or the pressure of the gas stream may just force them along, if they are present in larger molecules. In fact, part of the reason why pneumatic conveying is popular is that it works for a large range of sizes of solids, from fine powder and pellets to much larger particles.
There are four different types of pneumatic conveying systems, defined by the number of inlets as by diverter valves. Vacuum operation pneumatic conveying means that here are multiple valves present. This system has the advantage of being able to move many particles from different areas all at once, but the systems tend to lose pressure the farther down the tubes the waste travels. In addition, vacuum operations require filters in order to facilitate the movement of waste, and that means additional costs accrued in the disposal process.
The other main type of pneumatic conveyance system is pressure operations. Instead of sucking the particles along, these operations blow it instead, and are able to generate quite a lot more distance in the process, sometimes doubling the pounds per square inch achievable by the vacuum system. Ideally, many waste disposal companies choose a combination of vacuum and pressure operation.
The final distinction lies within the properties of the solids themselves. In reference to this, there are two types of pneumatic operations, the dilute phase and the dense phase Dilute refers to solids that can be conveyed in suspension, while dense refers to those which are bigger. Because of the large size, dense phase operations are only available with the pressure option, due to its ability to generate a greater psi, thus moving the large particles along.
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Suitable for use on an airlock, pneumatic feeder on conveying systems or as a product-metering device, Flex-Tip (FT) rotary valves have been used in a wide range of industries: chemical, metallurgical, food, wood products, and grain/feed. This special design with flex-tip rotors creates the best air seal possible.
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