SU781503A1 - Method and apparatus for fire neutralizing of liquid wastes - Google Patents

Description

one

The invention relates to methods and devices for the fire disposal of industrial waste and can be used in the elimination of various wastes of chemical, petrochemical and other pro-soils.

Methods of fire disposal of liquid wastes in cyclone furnaces are known with the introduction of liquid wastes in an air stream directed along the gases tangentially or along the chord to a smaller circumference of 1 g, 3 and 4.

A disadvantage of the known technical solutions is the impossibility of reliably protecting the enclosing surfaces from liquid separation due to the concentration of the liquid plume in the near-wall area.

The closest in technical essence and the achieved effect is the method of fire disposal of liquid waste, including tangential supply of fuel together with primary air, inputting a mixture of sprayed liquid waste and secondary waste into the swirling flow of high-temperature combustion products.

air and exhaust products 5.

A device for carrying out a known method comprises a vertical

5 cylindrical chamber with a lid, burners for supplying fuels. A and primary air, installed tangentially j of secondary air nozzles with nozzles located in them

10 spraying liquid waste, placed behind the burners in the direction of gas movement, and clamped to remove the obtained products.

A disadvantage of the known device is the tangential entry of a stream of secondary air in which the sprayed liquid waste is distributed. Such a distribution of liquids and in the near-wall flow, which is in contact with the fencing surface, leads to the intensive destruction of the fencing surface due to continuous local heat changes during the separation of drops on the wall and corrosion

2f5 activity of wastewater components.

The purpose of the invention is to increase the efficiency and reliability of the process.

This goal is achieved by the fact that according to the method of firing liquid-waste discharging, which includes supplying fuel together with primary air, introducing into the swirling flow of high-temperature combustion products a mixture of sprayed liquid waste and secondary air and withdrawing the resulting products, a mixture of sprayed liquid waste and secondary air they are delivered to the colliding jets, and an axial stream of tertiary air is introduced into the zone of contact of the jets in the direction of the city.

In order to improve the economics and reliability of operation, a device for carrying out the method, comprising a vertical cylindrical chamber with a lid, burners for supplying fuel and primary air, installed tangentially, nozzles of secondary air with nozzles for spraying liquid waste located in them, placed behind the burners as the gases move , and the clamp for removal of the products obtained, is equipped with a tertiary air nozzle installed in the chamber lid along its axis, and secondary air nozzles with disposed in Injectors for spraying liquid waste are placed across the chamber diameter opposite to each other. With this method of introducing liquid waste, the axial area (with low pressure) fills the area of the furnace volume, which contributes to an increase in the specific load of wastewater by increasing the utilization rate of the working volume. The pulsing vortex torch of the sprayed liquid suspension is concentrated in the central zone of the furnace volume and is separated from the enclosing surface by a gas wall layer (high pressure zone). The central tertiary air flow fills the near-axial region of negative pressures in the fuel combustion zone and thereby prevents suction of liquid droplets to the root of the fuel plume, which could lead to a phlegmatization of the combustion process.

Radial counter-jets squeeze out wastewater droplets from the firebox walls, which, after repeated penetration and partial evaporation, acquire a tangential velocity, forming a movable pulsating gas suspension, in the central zone of the furnace, moving to the outlet from the furnace volume. Due to this organization of the input of wastewater into the furnace volume, the residence time of the sprayed liquid in the furnace increases and heat-mass transfer processes are intensified, which improves the conditions for waste disposal. The formation of a liquid cloud in the central region protects the fencing surfaces from erosion.

The design of a cyclone furnace with upward flue gases and a smooth transition of the combustion chamber into the flue duct filled with heat-using elements (air heat exchanger, waste heat boiler, water-heating boiler, etc.) and ending with a chimney providing suction of exhaust gases through the device and. air leakage for cooling external walls of gases discharged into the atmosphere, has the least resistance of the system for exhaust gases and allows them to be used, requires minimal energy consumption for own needs , economical, convenient and 5 easy to install and operate.

FIG. Figure 1 shows a cyclone furnace for fire disposal of wastewater, a longitudinal section; FIG. 2 is a view B-B in FIG. 1 (1 to s);

0 in FIG. 3 is a view B-B in FIG. 1 (2 to s).

A device for the fire disposal of liquid waste contains a cylindrical vertical chamber 1

5 combustion converts to flue 2 filled with heat-using elements 3 heat recovery boilers, air heaters, water boilers, etc. The tangential fuel burner 4 of natural gas, fuel oil, process gas, etc. In the second by se at a distance of not less than 0.5 of the chamber diameter

J there are two pairs of nozzles 5 and b of secondary air, with 7 wastewater nozzles installed in them. The distance between the pvs themselves is determined by the need for complete combustion of the fuel. Each pair of nozzles 5 or b is located on the same axis along the diameter of the cylindrical chamber. At the end of the chamber opposite to the exit of exhaust gases, an air nozzle 8 of tertiary air is installed along the axis of the cylinder.

Installing a chimney above the gas well provides additional traction, helps reduce the cost of fuel-in-place mechanisms and reduces the amount of installation work.

The device works as follows.

Through the premixing burners 4, installed tangentially fixed, the natural gas in the amount of 1100-1500 nm / h is fed together with the primary air into the combustion chamber 1. The air flow rate in the burners is 1.2-1.3.

In the swirling flow of wound products at a temperature of 1500-1 B00 ° C through the opposite nozzles 5 and 6 with 7 wastewater injectors installed in them, gas-liquid suspension of secondary air with wastewater-composition,%, is injected:

Dicarboxylic acids 10-18 Cyclohexanone up to 2 Cyclohexanol up to 1 Water Else

Consumption of secondary air - 710 thousand nm / h. Departure speed - 6070 m / s. Wastewater consumption 7-10 t / h.

Through the air nozzle 8 installed at the end of the furnace, the swirling flow of tertiary air (20% of the secondary air) is supplied - 1.4-2 thousand nm / h.

The specific weight of the working volume of the cyclone furnace is 0.87.

In the process of disposal of this waste water at a temperature of exhaust flue gases of 1000 ° C and an air flow ratio of 1.08-1.1, the organic components are oxidized to stable CO and compounds.

Experimental studies have shown the absence of separation of sewage droplets on the furnace lining.

Reamuction of the invention makes it possible to increase the efficiency and reliability of the process by increasing the furnace load due to improved use of the furnace working volume, filling the axial zone and improving the spraying and crushing of droplets by colliding jets, increasing the overhaul working mileage and increasing complete decontamination due to elimination of the separation of drops by chamber walls.

Claims (5)

1. The method of fire disposal of liquid waste, including tangential supply of fuel together with primary air, entering into the swirling stream of high-temperature combustion products a mixture of sprayed liquid waste and secondary air and withdrawing the resulting products, in order to increase the efficiency and reliability the process, a mixture of sprayed liquid waste and secondary air is supplied by colliding jets, and an axial flow is introduced into the contact zone of the jets along the gases 0 tertiary air flow. 2. An apparatus for carrying out the method, comprising a vertical cylindrical kgiller with a flap, burners for supplying fuel and primary air, installed tangentially, secondary air nozzles with nozzles located therein for spraying liquid waste, placed behind the burners along the gazbv movement, and pinch for disposal products, characterized in that, in order to improve efficiency and reliability of operation, it is equipped with a tertiary air nozzle, 5 installed in the lid of the chamber along its axis, and the secondary air nozzles are located with nozzles for spraying liquid waste located in them along the diameter of the chamber and installed Q towards each other. Sources of information taken into account in the examination 1. USSR author's certificate 545B28, cl. F 23 & 7/04, 1974. 2. For Germany FRI 2359730, 5 cl. 24 d 2, published .. 1975. 3. The patent of Switzerland No. 486667, cl. F 23 C 7/00, published. 1970. 4.Patent UK No. 1438221, cl. F 4 V, pub. 1975. 0 5. UK Patent No. 1353613, cl. F 4 V, pub. 1971 (prototype).