CS205347B1 - Method of controlling heat supply to sinter charge - Google Patents

Description

CZECHOSLOVAK SOCIALIST REPUBLIC ‘(19) DESCRIPTION OF THE INVENTION FOR COPYRIGHT CERTIFICATE 2OI5347 (11) (Bl) (22) Registered 05 01 78 (51) Int. C1.3 F 27 B 21/06 (21) (PV 121—78) / DISCUSSION / DISCOVERY (40) Published 29 08 80 (45) Published 30 03 84 (75)

Author of the invention TŮMA JIŘÍ ing. CSc., Štramberk, 'PROUZA MIROSLAV doc. CSc., Ostrava, (DRABINA- JOSEF ing., Vratimova CHLEBEK LUBOMIR ing., Ostrava * (34) Method of heat supply control of sintered charge 1

BACKGROUND OF THE INVENTION The present invention relates to a method for controlling the temperature of a sintered charge; a mixture of dusty powders, fuel, returning additives, to which an agglomerate is produced by burning the gas streams through a charge layer on the sintering belt.

By burning the gas above the surface, the flue gas is fed through which the sintered layer is supplied with heat to initiate the sintering process by heating the surface layer of the binder of a certain thickness to a certain temperature which will allow the transfer of this high temperature band while sintering the particles into the lower layers of cold air sifting. Upon initiation of the sintering process, heat may be added to the charge in addition to sufficient heating of the sintered layer to replace the solid fuel dispersed in the charge or to favorably influence the thermal conditions of sintering of the individual horizons over the height of the charge layer.

The current method of controlling the supply of heat to the gas-sintered layer and the consumption of heat to initiate the sintering process or to add. heating according to the heating surface temperature of the batch or the flue gas temperature of the burners has a disadvantage. The temperature of the flue gas or the surface of the charge increases with excess heat from the combustion of the gas and decreases as the heat does not. The disadvantage of this method of control is that the temperature changes are caused by 2 imbalances between power and consumption, because the ignition and heat head system has thermal inertia. This causes a delayed adaptation of the sintering to the layer and thus an unevenness of the resulting agglomerate quality? '

These drawbacks are eliminated by the process of supplying heat to a sintered charge according to the invention in the production of an agglomerate on a sintering strip which regulates both the total heat output of the igniter section and the total heat output of the afterburner section burners. proportionate to the speed of movement of the sintering belt, at given proportionality factors, which are corrected according to the calorific value of the gas, wherein the speed of movement of the sintering belt decreases when the flue gas from the burners is sucked in more than the charge layer.

The proposed method of control has the following advantages: The advantage of the proposed method of controlling the stabilization of the heat supply of the layer surface of the charge. Stable heat delivery has the effect of smoothing out the quality of the surface layer and a more uniform sintering process. in the lower layers. This method of supplying heat to the sintered layer is substantially more resistant to the effects of objectively existing fault effects. 205347

Claims (1)

For the sintering of a given amount of charge, it is necessary to sieve a constant volume of flue gas through the layer. so that the high-temperature band arrives at the strip grating at the desired end of the strip. When the amount of flue gas produced is smaller than can be sifted at a given underpressure below the sintering belt grate, the heat input of the burners is adjusted in proportion to the speed of movement of the sintering belt. Due to the defect in the permeability of the charge layer in the region of the ignition and firing burners, there may be a situation where the fumes produced by the burners cannot be sucked into the sintered layer and leak out of the useless layer. This condition can be an indication of the measurement of the flue gas overpressure in the burner compartment or the flue gas temperature measured at the point where the flue gas from the burner compartment can escape. In this case, the heat output of the burners is reduced to the limit of the equilibrium of the amounts produced and aspirated by the above methods. The equilibrium heat output is adapted to the belt speed so as to maintain the ratio between the reduced heat output of the burners and the burners. If the flue gas from the ignition head ceases to leak, as can be determined by measuring the temperature or pressure at said locations, the heat output of the burners is increased to a value corresponding to the speed of movement of the sintering belts as determined by the belt motion synchronization regulator. high temperature in the charge layer. If the failure of the charge permeability lasts longer than the sintering time, the sintering belt speed regulator reduces the required amount of this rate of undervalue corresponding to the equilibrium between the produced and exhausted flue gases from the burner and the repaired speed is adapted to the heat output of the burners. This is due to the fact that a given amount of charge is passed through a certain volume of flue gas from the underlay of the sintering belt. The thermal output of the burners dependent directly on the product of the combustion gas quantity and the calorific value of the gas to control the appropriate ratio between the articles in the method of controlling the heat supply of the sintered binder in the production of the sintering sinter agglomerate, which controls both the total heat output of the combustion section, thus, the burner burner additionally heats the rate of movement of the sintering belt in the gas and air to the burners, ensuring complete combustion of the gas. The calorific value of the gas can be determined by a continuous calorimeter or by analysis of periodically collected gas samples. It is preferred to regulate the calorific value of the gas by a constant additional system. initiation of the firing process is ensured by a heat of 65 to 75 MJm-2 ignited by the charge, obtained from a gas with a calorific value of 12 to 16 MJm-3. The length of the sintering process burners section is selected so that the flue gas exposure time is about 1 minute. The heat supplied to the batch by gas firing above the above limits, the one-time heating and its size is determined by the quality control system produced by the agglomerate. The following is one of the possible specific examples according to the method of controlling the heat supply of the sintered charge according to the invention. The sintering process is provided with heat of 65 to 75 Mj / m 2 of the fired charge. Heat is obtained by combustion of a gas having a heat value of 12 to 16 MJ / m 3. The length of the burner section to initiate the sintering process is selected so that the flue gas exposure time is about 1 minute. The air excess coefficient for gas combustion is 1.1. For example, for an average heat of 70 IU / m 2 to initiate a sintering process, the heat output of the igniters in MJ / s is determined by multiplying the speed squirting band in m / s by the coefficient of the product of a constant of 70 IU / m 2 and the sintering band width. The required gas flow rate in m3 / s is determined by the ratio of the required thermal output in MJ / s and the calorific value of the gas in MJ / m3. Heat in excess of 75 IU / m2 is needed for additional heating. The size is variable according to the required surface quality of the charge, but the upper limit is 200 MJ / m2. The thermal performance of the respective burners is determined by the same procedure as for initiating the sintering process. The excess coefficient of air is in the range of 1.3 to 1.7. The control method described can be realized by conventional analogue or digital control means. The coefficients of proportionality between the sintering belt speed and the heat output of the burners for initiating the sintering process for post-heating are based on the aforementioned numerical data and the size of the sintering band, the appropriate proportionality coefficient, with the flue gas escaping from the burner compartment in the vicinity of the sintering belt, the velocity of movement is reduced to a value at which the amount of fumes produced by the burners corresponds to the amount of flue gas sucked by the charge layer. jCT, n. p., operation 6, J. Hradec Price: 2,40 Kčs ·