SU1285265A1 - Device for flame degreasing of liquid combustible waste - Google Patents

Abstract

The invention can be used at the enterprises of the chemical industry and other branches of the national economy, where technological and fuel waste with high-boiling components is formed. To eliminate the coking of the pre-flame zone in order to increase the efficiency and reliability of the process, the secondary air is introduced above the disposal zone and is directed towards the waste layer along the entire boundary of the combustion zone. Liquid combustible waste through the pipe 3 enters the bath b, and through the holes 6 of the stabilizing insert 5 gets to the surface of the bubbling grill 2. From the pipe 4, the primary air enters through the holes of the lattice 2 into the insert 5. In the prechamber 7, the waste components are removed as droplets and vapors, where they are burned in a stream of secondary air entering through nozzles 8. Secondary air washes the surface of the prechamber chamber, creating an aerodynamic curtain of walls from the drops, and flows around the lower part of the prechamber walls along an optimal radius. Combustion products are removed through an embrasure 9 located in the center of the rear wall. 1 il. (L

Description

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The invention relates to devices for the fire disposal of liquid coking waste and can be used in chemical, petrochemical and petroleum refining industries, as well as in public households associated with the use of petroleum products, and is intended for the disposal of waste in energy furnaces. boilers and other heat using 1x installations, in which, based on the design features, as well as according to the operating conditions, it is necessary to pre-chamber place neutralizing about the device.

The purpose of the invention is to increase the reliability and continuity of the device when burning combustible waste with high-boiling components by preventing droplets generated by the layer of waste from falling on the surface enclosing the separation zone and the combustion zone due to aerodynamic protection with high-speed downstream secondary air boundary neutralization.

The drawing shows a device for the fire disposal of liquid combustible waste.

The device comprises a bath 1 provided with a bubbling grill 2 and nozzles 3 and 4 for supplying, respectively, liquid waste and primary air (a bubbling agent). In bath 1, a stabilizing overflow insert 5 with holes 6 is installed. Chamber 7 has nozzles 8 of secondary air and an embrasure 9 in the center of the back wall.

The device works as follows.

Liquid combustible waste through the nozzle 3 enters the bath 1 and through the openings 6 of the stabilizing overflow insert 5 enters the surface of the bubbling grid 2. From the nozzle 4, the primary air flows through the openings of the bubbling screen 2 into the stabilizing overflow insert 5, where a dynamic layer is formed. The pre-chamber 7 carries waste components in the form of droplets and vapors, where they are burned in a stream of secondary air entering through nozzles 8 coming out of the nozzles at a speed of 50-60 m / s and washing the surface of the pre-chamber walls, creating an aerodynamic curtain from in a layer of drops.

Reaching the surface of the gas-liquid preparation layer, the secondary air flow partially loses kinetic energy, and its velocity becomes comparable with the velocity of the gas-air primary mixture entering the pre-chamber, while the primary air and secondary air are mixed. The latter wraps around the lower part of the pre-chamber walls at the optimum5

radius of 0.4-0.6 pre-chamber widths.

An increase in the ratio of more than 0.6 creates stagnant zones in the lower part of the pre-chamber, which worsens the blowing of these areas with secondary air and contributes to the formation of coke growths in these areas.

Reducing this ratio below 0.4 impairs the aerodynamics of the secondary air flow. In this case, the secondary air is not injected perpendicularly to the flow of the fuel-air mixture, but closer to the surface of the layer (into the bubbling bath), it disrupts large drops from its surface, which worsens the completeness of firing treatment (the reliability of decontamination decreases).

In addition, large droplets, captured from the surface by layers of secondary air, fall on the walls of the prechamber, which are unnecessarily irrigating them.

Thus, the secondary air from the beginning of the Qa flows around the walls of the pre-chamber from top to bottom, then passes the over-layer zone from the periphery to the center and rises again after mixing in the center.

In the prechamber, the resulting air-fuel mixture is burned, resulting in the formation of harmless substances.

Disposal products are removed from the device through the embrasure 9, located in the center of the rear wall of the pre-chamber 7, and sent to the waste-heat boiler.

When disposing of watered waste with high-boiling components (up to 20-30%), the embrasure displaces below the center causing droplets generated by the foam layer to be carried out through it, which is unacceptable under the conditions of complete disposal.

Offsetting the embrasure above the center leads to excessive overheating of the upper wall of the pre-chamber, which leads to a decrease in the reliability of the device.

The design of the device allows for the safe and continuous disposal of liquid waste.

Claims (1)

Invention Formula A device for the fire disposal of liquid combustible waste containing a bubbling bath with a pre-chamber and a secondary air nozzle, characterized in that, in order to increase its reliability and continuity when burning combustible waste with high-boiling components, the secondary air nozzles are located along the prechamber chamber side walls and are directed towards the base of the pre-chamber, made rounded with the ratio of the rounding radius of the inner walls to the pre-chamber width equal to 0.4-0.6, and exit 5 on the pre-chamber embrasure Nena in the center of the rear wall. 0 five 0