SU1537966A1 - Method of measuring mechanical undercombustion of fuel - Google Patents

Abstract

The invention relates to the control of combustion processes and may find application in heat and power engineering for determining heat losses caused by mechanical underburning of fuel. The purpose of the invention is to increase the speed and accuracy of measurement by eliminating the influence of ash sticking on the walls of the reaction chamber on the measurement result. This is achieved by the fact that, in addition to the gasification process of a sample of fly ash from boiler units, with a reagent that causes carbon to be converted into output gaseous products, whose concentration is measured separately, the ash stuck to the walls of the reaction chamber is gasified and the measurement result is subtracted from the output value obtained from gasification ash samples. 1 il.

Description

FIELD: control. | combustion processes and can be used, as an example, in heat and power engineering for determining heat losses caused by mechanical underburning of solid and liquid fuels.

The aim of the invention is to increase the speed and accuracy by reducing the effect of ash sticking to the walls of the reaction chamber.

The drawing shows a diagram of a system for implementing the method.

The system contains a dispenser 1, a reaction chamber 2, a gas distribution grid 3, a heater 4, a filter 5, a sensor 6, a recorder 7, a flow booster 8, gas valves 9-11.

The method is carried out as follows.

Using the dispenser 1, the fly ash is served in discrete portions of the size

5 g to the reaction chamber 2. Moreover, the process of mixing the ash with an additional reagent (carbon dioxide) and their interaction is carried out in a fluidized bed, which significantly intensifies the process of converting carbon of fly ash to carbon monoxide. To organize a fluidized bed of ash in the reaction chamber, the internal cavity of the latter is tapered and provided with a gas distribution grid 3. The velocity of the additional reagent in the reaction chamber is set lower than the speed of the particles, the ash, which ensures a stable formation. ic boiling layer of ash. The interaction of carbon fly ash with carbon dioxide is carried out at 800 ° C, which is established using an electric heater 4 superimposed on the reaction chamber - RU 2.

The gaseous products formed as a result of the gasification of the ash sample are taken from the reaction chamber with the aid of the flow rate driver 8 to the filter 5, and the excess thereof is discharged. The products that have undergone cleaning are fed to the analysis in sensor 6, where an oxidant is simultaneously introduced.

Sensor 6 measures the thermal effect of oxidation of the gas component, in this case carbon monoxide. The sensor contains measuring and compensation elements made of aluminum oxide, equipped with platinum thermometer-heaters and included in the adjacent arms of the bridge measuring circuit. The carrier of the measuring element is coated with platinum group metals, which provides catalytic oxidation on its surface of chemical underburning products. The carbon monoxide content is recorded using an automatic recorder 7.

After the gasification products of the ash sample have been registered by the instrument 7, the taps 9 and 10 are closed and the reaction chamber is purged with air. However, part of the ash in the form of sticking remains on the station walls of the reaction chamber, which is due to its adhesive properties, which are significantly intensified when heated. The sticking marks are random and significantly affect the accuracy of the measurement of underburning in the ash. In order to eliminate this effect, sticking ash is separately gasified. For this purpose, the taps 9 and 10 are opened and the gasification products are registered by the device 7 according to the described scheme. Moreover, the value of the readings of the recorder during the gasification of ash stuck to the walls can be 20-30% of the total signal during the ash sample gasification. From the difference between the readings of the recorder 7, a value proportional to the mechanical underburning of the fuel is calculated.

Claims (1)

Invention Formula The method of measuring mechanical underburning of fuel by gasifying a sample of volatile ash of a boiler unit by heating it in the reaction chamber in the presence of an additional reagent for measuring concentrations of combustible gases in gaseous gasification products and calculating the amount of mechanical underburning, which in order to increase speed and accuracy by reducing the effect no sticking of ash on the walls of the reaction chamber, gasification of the ash sample is carried out in a fluidized bed formed when the ash sample is blown After addition of the ash gasification, the reaction chamber releases the gasified ash sample, refills the reaction chamber with an additional reagent, gasifies the ash stuck to the walls of the reaction chamber, and measures the concentration of combustible gases in the gaseous gasification products, and calculates the mechanical underburning value. produced by the difference in the concentrations of combustible gases in the gaseous products formed during the gasification of a sample of ash and ash stuck to the walls of the reaction chamber. eight If