Analysis of the operation of pumps when used in biogas plants

Purpose. Analyze the operation of pumps when used in biogas plants and the features of their use. Provide guidance on the use of different types of pumps, their advantages and disadvantages, and features of maintenance. Methods. In the analysis of different types of pumps the methods of system and comparative analysis, scientific generalizations and method of argumentation are used. Results. The article analyzes existing pump designs for pumping manure (substrate). The comparative characteristics of the following pumps, which are most commonly used in biogas plants, are given: centrifugal, eccentric auger and rotary piston. As a result of the analysis the characteristics of their application, advantages and disadvantages, variants of structures and features of maintenance were obtained. Conclusions. The choice of suitable pumps according to the capacity and characteristics depends largely on the substrates used, their degree of preparation and/or dry matter content. An analysis of existing designs has shown that the use of plunger pumps (especially rotary ones) has many advantages over centrifugal ones: the ability to work with viscous substrates, self-priming and more pressure stable, suitable for substrate dosing, easy to maintain. Keywords: pump, biogas plant, methane tank, substrate, sludge, dry matter, manure.