To assess the burn resistance air tuyere in blast furnace using the finite element method (axisymmetric problem), DEFORM-2D software was used. Ceramics with a slurry coating applied to it was used as thermal insulation for protection against air tuyere burnout. The resistance to air tuyere burnout with the selected thermal insulation on its outer surface is estimated by calculating the stress intensity.

A proposed method to increase the service life of the heat-insulating insert in the air passage of the blast furnace tuyere suggested gluing heat-resistant siliceous fabric onto its outer surface, and to reduce heat loss and increase the tuyere resistance to burnout, fixing a ceramic disk to the end of the tuyere’s nose. The necessity of measures to increase the service life of a heat-insulating insert in the tuyere was justified by simulating its stress state in Ansys. The use of heat-resistant siliceous fabric on the entire outer surface of the insert allowed a more than twofold increase in the insert’s service life compared to the option when the fabric was glued to the insert part from the flange to the gas pipe. Using simulation of the tuyere’s thermal state in a DEFORM–2D environment and industrial experiments, the possibility of reducing heat loss and protecting the tuyere from burnout by thermal insulation of the end of its nose using a ceramic disk is shown.

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The article discusses the technology of processing scraps and fibrous waste of light, knitted and textile industries, as well as the principles of machine tools. Recommendations for improving the technology of processing fibrous waste are given.

The paper demonstrates the effect of the step in the blow channel and the insulating lining on the intensity of mixing natural gas with the air blast and its combustion in the blow channel, as well as on the increase in the air blast temperature at the tuyere outlet. This allows to increase natural gas consumption and reduce coke consumption.