Calculation of Gas Infrared Burners for Soil and Substrate Disinfection in Protected Ground

Abstract

A gas infrared burner was first developed in 1933 in Germany for the conversion of gas combustion energy into thermal energy of infrared radiation. The design of the gas infrared burner includes a ceramic perforated radiator panel and auxiliary elements (gas valves) that control the process of gas supply to the burner and subsequent combustion of the gas-air mixture. The work efficiency depends on the appropriate selection of the dimensions of its main structural elements. (Research purpose) The research purpose is in calculating gas infrared burners for disinfection of soil and substrate in protected ground. (Materials and methods) The calculation of gas infrared burners is reduced to determining the dimensions of its main structural elements: nozzle, throat, mixer, reducer, diffuser and nozzle. (Results and discussion) The gas flow rate per burner, the cross-sectional area of the nozzle and its diameter, and the gas flow rate from the nozzle, the area of the radiating surface were determined based on the specified thermal load Qo and the specific load qo of the nozzle. The calculations of the velocity of the gas-air mixture in the holes of the tile fit within the limits of permissible speeds. The article presents the calculation scheme of the gas infrared burner. (Conclusions) The gas infrared burners, the main structural elements, gas consumption and the speed of the gas-air mixture were calculated. The calculations of infrared burners showed that the velocity of the gas-air mixture in the holes of the ceramic tile fits within the permissible values, which will positively affect the efficiency of its operation.

The heat conductivity mechanism of the IR heating propagation for surfaces decontamination in protected ground

“…The numerical investigation of (17) with the parameters obtained from experiment gives us the average value F = 0.02 K/c for the inner heat sources distribution density coefficient (it is constant for the temperature depends on time almost linearly, Figure 2) and а2 = 0.9ꞏ10-9m2/cfor the thermal diffusivity coefficient. The result fits with the reference data ( [2]).…”

“…Soilless and substrate growing methods and modern greenhouse facilities require decontamination of surfaces (floor and walls) in order to obtain healthy seedlings and a good harvest. Therefore, it is proposed to disinfect surfaces with infrared (IR) radiation [1][2][3][4][5].…”