SU1105735A1 - Method of checking incomplete combustion of fuel in escape gases - Google Patents

Abstract

METHOD. OF THE CONTROL OF INCOMPLETNESS OF COMBUSTION OF FUEL IN THE OUTDOMING, GASES by taking a sample of the products of combustion, after-burning of fuel in it. residues and measurements of the decrease in the concentration of oxygen in a gaseous medium, characterized in that, in order to increase the accuracy of control, a sample of the combustion products is divided into two parts, one of which is free from eolian ash, a separate afterburning and measurement of the decrease in the oxygen concentration of the sample parts and determine the value of chemical underburning by the decrease in oxygen concentration in the part of the sample without eolian carry-off, the total value of chemical and mechanical underburning by the decrease in oxygen concentration in the part of the sample with aeoline osom and magnitude of the mechanical underburning sum of difference (C A value Marne chemical and mechanical unburned carbon and unburnt chemical quantities.

Description

The invention relates to heat and power engineering and can be used in other areas of the national economy using boiler plants, furnaces and solid fuel combustion devices, and is intended to control chemical and mechanical underburning values in flue gases and carried away or ash.

Methods are known for controlling the incompleteness of fuel combustion by the composition of combustion products by measuring the electrical quantities of coal ash, such as dielectric constant, of the content of non-combustible carbon in ash lj.

The disadvantages of these methods are the LOW measurement accuracy (+ 10%), as well as the ability to control only the mechanical underburning of fuel.

Closest to the present invention is a method for controlling incomplete combustion of fuel in exhaust gases by taking a sample of combustion products, afterburning fuel oil in it and measuring the loss of oxygen concentration in a gaseous environment 2.

The disadvantage of this method is low control accuracy due to the fact that when measuring the magnitude of mechanical underburning, the magnitude of chemical underburning is simultaneously measured by the decrease in the oxygen concentration in the gas.

The purpose of the invention is to improve the accuracy of the method for controlling incomplete combustion of fuel in exhaust gases.

This goal is achieved in that according to the method of controlling incomplete combustion of fuel in flue gases, the sample of combustion products is divided into two parts, one of which is free from eolian ash, separate afterburning and measurement will kill the oxygen concentration of the parts of the sample and determine the amount of chemical damage at a decrease in the concentration of oxygen in the part npo% i without ash, the total amount of chemical and mechanical underburning at a decrease in the concentration of oxygen in the part of the sample with GOLD - fly and the value of mechanical underburning according to the difference of the total chemical and mechanical underburning and chemical underburning.

A method for controlling incomplete combustion of fuel in exhaust gases is carried out as follows.

Sampling of combustion products is done discretely-defined. In portions, the volume of which does not change during the afterburning process. A sample of the combustion products is divided into two parts, one of which is freed from ash and the after-burning of both parts is performed.

The magnitude of chemical underburning is determined with the help of an activimat multipoint gas analyzer by the decrease in the oxygen concentration. In a part of the sample without ash ash:

QZ-OZ 3 where Oj is the oxygen concentration to

dozhigani,

02 - oxygen concentration in the part of the sample without ash and ash after afterburning. . The total value of chemical and mechanical underburning is determined by the decrease in oxygen concentration in the part of the sample with ash carried away:

ti

Qg-o;

n21-og

where Od is the concentration of oxygen in

parts of the test with ash ash after the afterburning. The magnitude of the mechanical underburning

determined by difference

2 H - 3

The method of controlling incomplete combustion of fuel in exhaust gases allows simultaneous and separate determination of the chemical and mechanical underburning values, which allows to increase the measurement accuracy and eliminate error 3 of measuring the mechanical underburning rate in the presence of chemical underburning in the exhaust gases.

Claims (1)

METHOD FOR MONITORING THE INCOMPLETE OF FUEL COMBUSTION IN EXHAUST GASES by sampling the products of combustion, afterburning the combustible residue in it, and measuring the decrease in the oxygen concentration in the gaseous medium, characterized in that, in order to increase the accuracy of control, the sample of combustion products is divided into two parts, one of which is exempted from aeolian entrainment, separate afterburning is performed, and the decrease in the oxygen concentration of the sample parts is measured and the chemical underburning is determined from the decrease in the oxygen concentration in the sample part without the aeolian un ca, the total amount of chemical and mechanical unburnt loss of oxygen concentration in a portion of the sample carryover ash and unburned carbon mechanical quantity by difference of the total quantity of chemical and mechanical unburned carbon and unburnt chemical quantities. 1 1105735 2