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Abstract. Mathematical modeling of primary fuel change into power gas in power generating boiler with productivity of steam 160 t\h was done. Research of aggregate work on some power modes was completed. Characteristic curves of efficiency coefficient at different loads and ratio on power and natural gases burning were made. Practicability of power gas use as fuel was proved. Statement of problem and its solutionIn the last few years employees of VTI together with TPU have been developing the first domestic steam and gas installation with intracycle gasification of solid fuel. One peculiarity of steam and gas installation with intracycle gasification of solid fuel simultaneous working is that feeding of gasifier with air is done from gas turbine compressor. The biggest part of blasting air energy turns into power gas compression energy and then into revolution work by means of its combustion products expansion in steam path of gas generator turbine. It should be noted that researches in this sphere have been included into Program of electric power development in Russia till 2020.Design results of Russian power boiler used at Tomsk thermal power plat-3 with steam productivity 160 t/h at power gas burning are presented in the work.Mathematical model of boiler was developed with the help of software package Boiler Designer (a product of OPTSIM-K and KED) and its verification on plant design data and process flow test were completed. The main condition of the mathematical model was full equality of heating surface parameters, input into the model, to real construction and geometrical heating surfaces. Correlations were made on all points of boiler where heat carrier flow parameters measurements on gas, air and steam water paths were made. Variable parameters able to change the character of heat exchange in design model and make its adjustment are:-burning parameter; -screen heat efficiency coefficient; -coefficients of use and pollution of separate heating surfaces. Use of the parameters allows changing surface heat absorption and gas and environment temperatures on entering the following heating surface. Values burning parameter, screen heat a Corresponding author : matveev@tpu.ru Article available at

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