P. Nawara

Sterowanie piecem indukcyjnym do laboratoryjnego spalania biomasy

The paper presents the concept of modernization of the induction furnace designed for laboratory biomass combustion. This entails the use of a programmable logic controller (PLC) to control the combustion temperature of samples of biomass. Developed one of the main control program, consisting of several sub-schemes. Results of laboratory tests have confirmed the effectiveness of w / w induction furnace control system. (The control program for laboratory induction furnace combustion of biomass) Słowa kluczowe: piec indukcyjny, sterownik PLC, algorytm regulacji PID.

Impact of pulsed electric field on the quality of unpasteurized beer

This work presents an attempt at determination of the impact of Pulsed Electric Fields (PEF) on the selected quality characteristics of the Czech unpasteurized beer Muderlant. To make this determination possible, the studied material was subjected to the impact of 200, 300 or 400 PEF pulses using a prototype laboratory high voltage generator. The efficiency of the method in relation to reduction of selected microorganisms and to inhibition of their growth was confirmed under refrigeration storage up to 72 (h). Lower beer bitterness and turbidity were also observed after PEF use, which should be considered a beneficial result. However, a negative impact of PEF was observed in terms of lower anti-radical ABTS activity and polyphenol content in the beer.

High Frequency Induction Tube Furnace for Determination of Ash Melting Temperature

Abstract The article describes the designed and manufactured tube furnace intended for, inter alia, determining the melting temperature of ash conforming to the standard of ISO-540:2001. The possibility of digital sample observation and several programs controlling the obtainable temperature enable to determine the test cycle in any case (convenient for the researcher). Reduction of testing time allows for the analysis of the observed phenomena, as well as more detailed research plan of samples, where substantial changes have been demonstrated.