SU1388685A2 - Method and apparatus for controlling the burning-up of blast-furnace gas - Google Patents

Abstract

The invention relates to a control technique for the combustion of a gaseous fuel with varying heat of combustion, which can be used to control the combustion of top gas (kg) of coke cupola with air or air-oxygen blowing. The goal is to improve the combustion quality of the CG. In determining the CO concentration in the CG, CG losses are taken into account through the leakages of the discharge path and the cupola, which are determined functionally from the pressure in the top chamber of the cupola and the degree of leakage. A device that implements the method is equipped with series-connected pressure sensors in the top chamber of the cupola and a square root extraction unit, the output of which is connected to one of the inputs of the unit for calculating the CO concentration in the CG. 2 sec. f-ly, 1 ill. i (L

Description

05 00 00 05 00

sd

14)

one

The invention relates to a control technique for the combustion of gaseous fuels with varying heat of combustion by proportioning the fuel and air consumption to combustion, which can be used to control the combustion of blast furnace gas from air or air-oxygen blowing and is known to improve the conventional device .sv. No. 1244455.

The aim of the invention is to improve the quality of top gas combustion.

The drawing shows a device that implements a method for controlling blast furnace gas.

The device that implements the control method (Fig. 1) contains the flue gas flow sensor 1, the first calculation unit 2, the gas-air ratio controller 3 connected to the air regulator body 4 for burning the flue gas. The second input of the regulator 3 is connected to the output of the sensor 5 of the air flow going to the top gas combustion. Two inputs of the second calculation unit 6 are connected to the output 7 of the air (air-oxygen) flow blowing, the third input is connected to the output of the oxygen concentration sensor 8, and its output is connected to the second input of the first calculation unit 2. The two outputs of the multiplication unit 9 are connected to the output of the flue gas flow sensor 1 and the output of the oxygen concentration sensor 8, and its output is connected to the third input of the first calculation unit 2. The output t of the square core extraction unit 10 is connected to the fourth scaling input of the second calculating unit 6.

n, the input of which is connected to the output of the pressure sensor 11 in the top chamber.

The device operates as follows.

To the input of the square-root extraction unit 10, an output signal of the unit 11 is received, which is proportional to the current pressure in the top chamber. & The input signal of unit 10 is proportional to the loss of top gas through the leakiness of the top chamber and the discharge path. Using the scale of the fourth input of block 6, the required value of the leakage ratio K is set. an operation is performed to calculate the volume concentration of CO in the flue gas

C0

,, (i-4.76) + K, vj.

V.r

15 I 100%

0

five

0

0

where the volumetric flow rate of top gas,

O is the volumetric concentration of oxygen in the flue gas,%;

the coefficient characterizing the degree of leakiness of the top chamber, m / s-Pa P - excess pressure on the top. Pa;

Vg - volumetric flow rate of air (air-oxygen) blowing, m / s.

The output signal of the calculating unit 6 is fed to the second input of the calculating unit 2, to the first input of this unit a signal proportional to the top gas flow rate, and to the third input - 5 signal from the output of the 9 y block of the unit proportional to the volume flow of oxygen in the top gas. In block 2, the calculation is performed to calculate the necessary flow rate; 0 spirit for burning. The output signal of the calculation unit 2, proportional to the required (specified) air flow, is fed to the first input of the regulator 3 of the ratio,. In the measuring unit of the regulator 3, the operation of comparison of the specified and is carried out. current air consumption for flue gas combustion. In the same block, the required excess air is set.

. In case of a mismatch at the output of the measuring unit, the regulator 3 displaces the regulating body 4 installed in the air duct, and adjusts 5 to the current air flow rate with the required value.

The use of a method and apparatus for controlling blasturizing gas leads to the increase of

Claims (2)

Claim 1. Burning control method. top gas according to ed. St. 20 No. 1244455, characterized in that, in order to improve the quality of burning of the top gas, they additionally control the pressure in the top chamber of the cupola and calculate the concentration of CO in the top gas in accordance with the expression, * 100%, where V _Rr is the volumetric flow rate blast furnace gas, m ⁵ / s; 0 ₂ - volume concentration of oxygen in the top gas,%; K _in - coefficient characterizing the degree of leaks of the top furnace chamber, m '/ s'Pa ^{, / 2} ; P _to - overpressure on the top, Pa; V _BA ~ volumetric flow rate of air (air-oxygen) blast, m - '/ s. 2, Device for controlling flue gas burning according to ed. St. No. 1244455, characterized in that it is equipped with a series-connected pressure sensor in the top chamber of the cupola and the square root extraction unit, the output of which is connected to the fourth input of the second calculation unit. VNIIIPI Order 1569/41 Circulation 560 _________ Subscription Custom polygr. ave, city of Uzhhorod, st. Project, 4