Abstract: A method of determining heat losses due to incomplete fuel combustion consists in that periodic sampling of fuel combustion products is carried out. The sample is separated into two parts, one of which includes a gaseous phase, and the other, solid and gaseous phases. Oxygen concentration in each part is assessed, after which both parts are heated and burnt up to determine oxygen concentration after burning. Oxygen losses in the gaseous phase and in the mixture of the solid and the gaseous phases are determined, and heat losses due to chemical and total underburning of fuel are defined as the ratio between oxygen losses. Then heat losses due to mechanical underburning of fuel are estimated as the difference of heat losses due to total chemical and mechanical underburning, and chemical underburning of fuel.

Abstract: The apparatus materializing the method of determining the content of combustibles in the products of fuel combustion incorporates an oven with an electric heater connected into the load circuit of a controllable voltage source. The oven is provided with a pipe for introducing a sample of the end products of fuel combustion and with pipes for admitting an oxidizing agent and removing the end products of combustion of the combustibles. The sample is heated in the presence of the oxidizing agent to a temperature equal to or higher than the fire point of the combustibles present in the sample which, consequently, burn down. The temperature during the process of combustion is maintained constant with the aid of a temperature controller having its input connected to a temperature transducer located in the oven and its output connected to the output of the controllable voltage source.

Abstract: A method of determining heat losses due to incomplete fuel combustion consists in that periodic sampling of fuel combustion products is carried out. The sample is separated into two parts, one of which includes a gaseous phase, and the other, a solid and a gaseous phases. Oxygen concentration in each part is assessed, after which both parts are heated and burnt up to determine oxygen concentration after burning. Oxygen losses in the gaseous phase and in the mixture of the solid and the gaseous phases are determined, and heat losses due to chemical and total underburning of fuel are defined as the ratio between oxygen losses. Then heat losses due to mechanical underburning of fuel are estimated as the difference of heat losses due to total chemical and mechanical underburning, and chemical underburning of fuel.