Nitrogen for batch mixer

24.11.2020 12:06
Avoidance of dust explosions with nitrogen
© iStock.com/Thiago Santos

Herrsching, 24. November 2020


Avoidance of dust explosions with nitrogen

With the help of batch mixers, different substances are mixed together. This often creates dust and gases that can lead to explosions. Applying the inert gas nitrogen (N2) to the mixer efficiently prevents the risk of explosion. A leading international manufacturer of industrial mixers equips various of its products with nitrogen generators from Inmatec. In this way, the company's customers receive a complete solution from a single source. This week a PNC 9200 nitrogen generator was delivered to the company, which will in future be producing nitrogen on site at a customer in Hungary.

 

Batch mixers have several shafts equipped with mixing tools. As they rotate, the substances filled into the mixer from above are mixed with one another. Batch mixers are able to achieve a homogeneous mixture of the ingredients within a few minutes. The mixers are finally emptied downwards through an opening and are ready to receive a new batch. Both solid mixtures (e.g. powder) and solid-liquid mixtures can be processed in the mixers.

An artificial atmosphere is created in the mixers to prevent explosions or fires. By adding nitrogen, the oxygen required for ignition is displaced. Batch mixers are mainly used in the building materials industry and the food industry (e.g. for the production of baking mixes). Due to the short batch times, large amounts of nitrogen are required for this. A cycle (filling, mixing, emptying) takes between 20 seconds and a few minutes and so the mixer must be supplied with N2 with each new batch. Depending on the product filling level and the size of the mixer, up to several hundred cubic meters of nitrogen are required per hour.

Due to the large amounts of nitrogen required for this process, nitrogen generators are the ideal solution for nitrogen supply. The Inmatec IMT PNC 9200 nitrogen generator that has now been delivered generates up to 129 m3 / h of N2 with a purity of 99% directly on site. On the platform there is also an air compressor and several buffer tanks to provide nitrogen for any production peaks. By using this autonomous nitrogen production unit, the required N2 quantities, which can vary widely, do not have to be planned. Any delivery bottlenecks for liquid nitrogen, which is delivered by truck, are eliminated. The IMT PNC produces the required quantity at any time and also saves costs and protects the environment.

 


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