SU1578613A1 - Method of determining the heat of combustion of heavy liquid fuels - Google Patents

Abstract

The invention relates to thermophysical measurements, in particular to methods for determining the heat of combustion, and can be used in heat power engineering and in scientific research. The purpose of the invention is to increase the express measurement. The measuring cell is placed in an isothermal shell. In the combustion chamber, the process of complete combustion of the fuel is carried out, and additional thermal power is introduced into the cell, heating the inner surface of the chamber to 600-900 ° C. After 10-15 minutes, the fuel supply to the cell is stopped, which is resumed after the solid coke residue has been completely burned. Combustion products are continuously diverted to the environment. Inside the isothermal shell, thermal power is continuously released, compensating for heat removal from the measuring cell to the shell. The heat generated during the measurement process is removed to the isothermal shell through heat sinks with known thermal resistances. The additional and compensating powers, as well as the mass of supplied fuel, which are used to calculate the heat of combustion, are measured. 1 il.

Description

heater 6, continuously compensate for heat flux through heat meters 7, registering a signal with heat meters with the device 8. Heat removal from the outer surface of cell 2 and heater 4 is carried out through heat sinks 9, 10 with known thermal resistances. Periodically, after 10-15 minutes, the fuel supply to cell 2 is stopped. After the combustion of the coke residue formed in chamber 1 (after 1-2 minutes), the fuel supply to the combustion chamber is resumed. The oxidizing agent is continuously fed at a constant rate throughout the entire measurement cycle. The values of the compensating power Qo from the heater 6 and the power from the heater 4 (Q to) are measured.

as well as the mass of fuel (t) supplied to the cell per cycle, 20 and b determine the heat of combustion of the fuel under investigation by the formula

U

J (K Q0-qK) d

m

de D

- time of one measurement cycle, s;

K R / I „(where R0 is the thermal resistance of the heat sink

power Q0 to the isothermal shell; R is the thermal resistance of the heat sink of the power released in the measuring cell to the isothermal shell).

thirty

35

Q 5

0

five

;

thirty

35

Claims (1)

Invention Formula The method of determining the heat of combustion of heavy liquid fuels, which means that the measuring cell is placed in an isothermal casing and the process of complete combustion of a known amount of fuel is carried out in the combustion chamber, characterized in that t additional heat flow, heating the internal surface of the combustion chamber to a temperature of from 600 to 900 ° C, the fuel and oxidizer are continuously fed into the combustion chamber, after a time interval from 10 to 15 minutes prek crushing the fuel supply and reopening after complete combustion of the solid coke residue, the combustion products are discharged into the environment, while the amount of heat continuously compensating for heat loss from the outer surface of the measuring cell inside the isothermal shell is released through heat sinks with known thermal resistances to the isothermal shell, the values of the compensating power, additional power and the fuel mass fed into the cell are measured, which calculate the heat of combustion of the fuel. Fuel Oxide / ty / ne / y