SU1351900A1 - Method of processing slag melt and device for effecting same - Google Patents

Abstract

The invention relates to building materials, mainly cement production, and can be used to produce cement in the metallurgical industry. The invention allows to increase productivity, quality of cement and to intensify heat and mass exchange. Mixing additives (clay, limestone) are fed to a cyclone kiln.2 6-6 (L with sl with fie.Z Pacfr / foff

Description

through the inputs. Air fuel station st-iecb is fed tangentially through the nozzles 3 into the furnace. In the working chamber, charge additives are melted. At the same time, a slag melt is sprayed into the working chamber through the slag nozzles 4, also installed tangentially and associated with the prechambers 5. Slag melt droplets are mixed with melt droplets of scrap materials. Thermochemical reactions occur. Then the mixture of pshak melts and materials gets through the pinch 6 into the mixer-mixer 7. Thanks to a special form of co1,

The invention relates to the production of building materials, mainly cement production, and can be used to produce cement in the metallurgical industry using secondary (material and energy t. Resources, for example, blast-furnace production.

The purpose of the invention is to ensure the production of high quality cement with an increase in productivity and intensification of heat and mass transfer.

Fig. I depicts a cyclone furnace, a plan; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

The device contains inputs 1 for feeding solid additives installed on the lid of the cyclone furnace 2, Fuel-air nozzles 3 are installed tangentially in the upper part of the working chamber, and slag nozzles 4 - tangentially working chamber of the furnace 2 at the height of the working chamber equal to h from the flatness output inputs 1, equal to 0.4-0.6 height H of the working chamber. Pre-chambers 5 are installed in front of the slag nozzles 4 to ensure overheating of the slag melt and its spraying, B. The lower part of the working chamber is clamped 6, which connects the working chamber to the mixer 7. The mixer is laid out in the form of an open ellipse in longitudinal section and two

51900

The saw blade and the bifurcation at the end of the pinch 6 into two parts immersed in the melt, additional mixing of the slag melts and materials BbDC materials occurs. Slag melt is blown into the cyclone furnace by the products of combustion of fuel with a speed that is 1.5-2.0 times higher than the feed rate of the energy carrier; an 11-fold nozzle is installed at a height of the working chamber from the exit plane of the inputs equal to 0.4-0.6 cameras. Mixer

. made in the form of an open ellipse in the longitudinal section and two adjoining circles in the transverse. 3 sludge.

circles in cross section. Pinch 6 is bifurcated in length, forming in the lower part of it two points with the cross-sectional area of the output of the hole, each 2 times smaller than that of the entrance cross-section. bench press A diffuser 8 and a cooling chamber 9 are successively connected to the mixer 7, in the bottom wall of which a tap-hole 10 is installed. The mixer and the deposition chamber have a brick lining 11 (cooling and crushing units are not shown).

The device works as follows.

Fine feedstock solid additives are fed into the cyclone chamber through inlets 1. During the combustion of the fuel entering the working chamber together with air through the nozzles 3, a high-temperature swirling turbulent gas vortex is formed. The flow rate of the energy carrier is 100-120 m / s. The charge particles are instantly heated, melt, and due to the centrifugal forces created by the gas vortex, are thrown onto the walls of the working chamber. The height of the separation zone (sedimentation) of the slag melt drops h depends on the speed of the energy carrier and, with an optimum speed of 100-120 m / s, is 0.5-0.7 of the height of the cyclone chamber N.

With the flow of slag melt along the vertical walls of the working chamber

Thermochemical reactions take place between the individual components of the mixture, which are completed at 60-70% at a height h, where slag nozzles 4 are installed. The installation height of the slag nozzles is 0.4–0.6 of the height H from the exit plane of the inputs. The slag is overheated due to the heat of the fuel being burned in the prechambers 5. When the slag nozzles are located higher than the furnace height than by a distance of 0.4 N, the quality of the slag melt mixing with the charge material deteriorates, since there will be no complete connection of the drops of the melted slag with the melt of the charge materials. When the slag nozzles are located lower in furnace height than at a distance of 0.6 N, thermochemical reactions do not fully occur, which degrades the quality of the cement.

Slag melt is supplied in the form of a jet and, due to the high velocity of the gases (combustion products of fuel), coming out of the pre-chamber 5, it is disintegrated into tiny particles (droplets). This allows them to almost instantly overheat in the working chamber in a suspended state by 150-300 C.

The velocity of the gases emerging from the nozzles 4 is 1.5-2 of the velocity of the energy carrier (the air-fuel mixture supplied to the upper part of the working chamber for heating the charge materials).

Since the nozzles 4 are installed tangentially, the particles (droplets) of the slag melt at the entrance to the working chamber of the cyclone furnace fall on its wall, where there is an intensive mixing of the slag with the melt of the charge (chemicals) and thermochemical reactions.

The gas flow entering the cyclone chamber through the nozzles 4 mixes with the gas vortex and increases its rotational speed and temperature, which leads to a decrease in the turbulence of the latter and the intensification of heat and mass transfer between the high-temperature gases and the melt. Next, the melt and gases pass together through the pinch 6 and get into the mixer 7, having in the cross section

0

five

0

Q 5

five

0

five

0

five

SRI form two adjoining circles. Pinch in the upper section (figure 2) has the shape of a circle. In height, the pinch is divided into two independent parts, each of which goes into its mixer circumference and has an ellipse shape (Fig. 3), the length of which is equal to the pinch diameter. The pinch outlet orifices are immersed in the melt in the mixer 7 and thus the gases exiting from the pinch are bubbled through the melt, which leads to intensive mixing and homogenization of the melt. From the mixer 7, the melt flows through the protrusion into the diffuser, the deposition chamber 9 and through the tap hole 10 enters the cooling.

The exhaust gases from the mixer 7 enter the diffuser 8, where the velocity of the gases gradually decreases, resulting in the smallest melt droplets from the gas flow, the final separation of which from the gases occurs in the settling chamber 9.

Example. Raw materials additives (CaO, AijOj), heated to 600 ° C, are fed through inlets into the upper part of the cyclone chamber.

The amount of these additives is 20–30% with respect to the slag melt coming in dispersed form.

The fuel-air mixture enters the cyclone chamber with a temperature of 550 - 600 ° C at a speed of PO m / s. As a result of fuel combustion, the temperature of the gases in the upper part of the cyclone chamber is maintained at 2000 to 2.100 ° C.

Slag solution in dispersed form with a temperature of 1500 C (ty, "200 C) is fed into the cyclone chamber using fuel combustion products having a temperature of 2100 ° C at a speed of 180 m / s (W 1.63), which allows to maintain the temperature in this part of the cyclone chamber at the level of 2000 - 2100 ° C.

In the interaction of the melt of raw materials with dispersed slag melt on the vertical walls of the cyclone chamber, a split forms. melt mixture, in which intensive thermochemical reactions occur between the individual components. From the chamber, the melt together with the gases through the ashes.

The press enters the mixer, where the gases are bubbled through the melt, which leads to intensive mixing and good melt homogenization. Here the thermochemical reactions are completed. Then the melt through the threshold flows into the diffuser, where there is a complete separation of gases from the melt.

Next, the melt is molten cement, Q stuffy nozzles for supplying energy carrier, installed in its upper part tangentially, inlets for supplying solid additives and slag nozzles installed tangentially with energy supply supply nozzles, characterized in that in order to ensure high quality cement with increase in productivity and intensification of heat and mass transfer, it is equipped with a mixer and pre-chambers, each of which is located in front of the slag nozzle installed at the height of the working chamber from the plane and inputs equal

flows through the entrance to the granulation.

The use of the proposed method makes it possible to increase the productivity and quality of cement by in-. Tension heat and mass transfer.

Claims (3)

Invention Formula 1. A method of processing slag jo melt, including its feed into. cyclone furnace, top loading of solid additives and tangential supply of energy in the feed direction l, installed in its upper tangentially, inlets for solid additives and slag coated ones - tangentially from the supply of energy carrier, which is different from the fact that, with an increase in the strength and intensification of heat exchange, it is equipped with chambers, each of which is placed in front of the slag nozzle, which is installed at the height of the working surface from the exit plane of the inlets, equal to, 25 0.4-0.6 the height of the working chamber. slag, that, in order to ensure the production of high-quality cement with an increase in productivity and intensification of heat and mass transfer, the molten slag is blown into a cyclone furnace by pro-A thirty 3. The device according to claim 2, in that the mixture is made in the form of an unclosed e in the longitudinal section and two circumferential circles in the transverse 1900 . the combustion of fuel at a rate 155-2.0 times the feed rate of the energy carrier, followed by additional mixing of the melt additives and slag. 2. A device for processing slag melt, including a cyclone furnace with a slave chamber, fuel-air nozzles for supplying energy l, installed in its upper part tangentially, inputs for supplying solid additives and slag nozzles installed tangentially with energy supply nozzles, characterized in that it is equipped with a mixer and chambers to ensure high quality cement with increased productivity and heat and mass transfer intensification , each of which is located in front of the slag nozzle installed at the height of the working chamber from the plane of the inlet thirty 3. The device according to claim 2, characterized in that the mixer is made in the form of an open ellipse in a longitudinal section and two adjoining circles in the transverse one. ten t (iue.2 Editor M. Nedoluzhenko Compiled by V. Yudin Tehred A. Kravchuk Order 5533/19 Circulation 588Subscription VNIIPI USSR State Committee for inventions and discoveries P3035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proof-reader I.Erdeyi