SU983386A1 - Method of automatic control of mazut heating temperature - Google Patents

Description

(W) METHOD FOR AUTOMATIC REGULATION OF THE HEATING TEMPERATURE OF THE MAZUT HEAT

The invention relates to methods for automatically controlling the heating temperature of fuel oil and is intended advantageously for boilers equipped with high-temperature fuel oil heaters, in the furnaces of which; fuel oils of various grades, toppings and crude oil are burned.

There is a known method of automatically controlling the heating temperature of fuel oil by measuring the temperature of fuel oil, the load of the boiler and the deviation from the set value of the parameter characterizing the spraying of fuel oil in the nozzle, and subsequent reading using measured steam supply signals for heating the fuel oil.

As a parameter characterizing the spraying of fuel oil in the nozzle, according to a known method, its viscosity is Cl.

The disadvantage of this method is that it does not take into account the formation of nitrogen oxides in the process.

incineration that pollute the environment.

The aim of the invention is to reduce environmental pollution by reducing emissions of nitrogen oxides.

The goal is achieved by | According to the method of automatic control of the heating temperature of the fuel oil, by measuring the temperature of the fuel oil, the load of the boiler and the deviation from the set value of the parameter characterizing the spraying of fuel oil in the nozzle, and the subsequent change in the measured signals of steam supply to the heating of fuel oil, the concentration of nitrogen oxides in exhaust gases and use it as a parameter characterizing the spraying of fuel oil in the nozzle.

Claims (1)

FIG. Figure 1 shows the structural system (the automatic system for regulating the heating temperature of fuel oil; Fig. 2 shows the dependence of the relative concentration of nitrogen oxides. The circuit (Fig. 1) contains the heating temperature adjustment controller 1 of the fuel oil connected by the inputs to the temperature sensor 2, unit 3, corrective device k, and output with a valve i 5 supplying steam to a high-temperature fuel oil heater. Correction device C is connected to sensor 6 for the concentration of nitrogen oxides and sensor 7 for load through a nonlinear function Transducer 8. The circuit works as follows: The heating oil heating temperature controller 1 changes the heating steam consumption by means of the valve 5 supplied to the high-temperature fuel oil heater, maintaining the heating oil heating temperature setpoint measured by the sensor 2 in accordance with the reference from the setting device 3 and the correction signal rt devices. When burning fuel oil of various brands or other liquid fuels and with large changes in the boiler load, the correction device maintains the concentration and nitrogen oxides in flue gases in accordance with the actual load of the boiler. Here, the predetermined value of the concentration of nitrogen oxides in flue gases varies depending on the boiler load, set by the converter 8.. . Instead of the signal from the temperature sensor 2, the cHrtfari sensor can be fed to the oil heating regulator 1 in the heating oil temperature controller 1. As a sensor 6 for nitrogen oxides in flue gases, an instrument for continuous monitoring and measurement based on the phenomenon of chemiluminescence, which has good reproducibility and low sensitivity to other gas components, can be used. FIG. Figure 2 shows the dependences of the change in the relative concentrations of nitrogen oxides and the relative temperature Tsch / T of M 10 fuel oil when it is burned in a gas-fired gas boiler TGNP-1 T at a nominal load of 300 MW, where T is the heating temperature of the fuel oil; T “itOO K” is the average operating temperature after heating the fuel oil T (K) T (° C) +273; CNO. CNOX concentrations of nitrogen oxides at 6 heating oil temperature and temperature T respectively (curve I the boiler is equipped with CKTI-TKZ burners; excess ratio in the furnace 2; degree of recirculation of flue gases, curve 11 — also at 2; curve 1И — HFTCKB burners Glavenergo) . It can be seen from the curves that in the range of heating of fuel oil temperatures (0.9-1.1}, 87-1b7s (curve II), (curves I and II |) concentrations of nitrogen oxides increase (increasing portion of the curves), and in the temperature range ( 1.1-1.3), 1b7-247 ° C decreases (the falling part of the curves.) The growing part of the curves corresponds to the range of temperature change of heating oil in conventional fuel oil heaters at heat stations. This indicates that the control of the heating temperature of fuel oil the temperature range of 87-167 ° C with conventional fuel oil heaters is unprofitable from the point of view of Oxygen oxides in the flue gases, although an increase in the heating temperature of the fuel oil simultaneously improves the dispersion characteristics of the fuel oil droplets. The falling portion of the curves corresponds to the range of operation of the high-temperature fuel oil heating heaters, for example, at the heating temperature of the fuel oil K () Depending on the boiler load, the concentration of nitrogen oxides decreases to 2 -2, S times. Along with this, chemical and mechanical underburning of fuel, hydrogen sulfide concentration in the near-wall zone of the NPS decrease practically to zero. no ash drifts heating surfaces. The invention The method of automatically controlling the heating temperature of fuel oil by measuring the temperature of fuel oil, the load of the boiler and deviating from the set value of the parameter characterizing the spraying of fuel oil in the f6 () tank, and the subsequent change from the measured steam supply signals to heating fuel oil, in order reducing environmental pollution by reducing you .5983386. four The sources of information determine the concentration of nitrogen oxides in gases taken into account in the examination and use it as a parameter. 1. USSR author's certificate for the dispersion characterizing the application (Г 3239822/2 On, cl. F 23 M 1/00. Of fuel oil in the nozzle. $ 16.01,81. Fig. /