SU1393994A1 - Method and apparatus for thermal disposal of production waste water - Google Patents

Description

(21) 4063602 / 29-33

(22) 04/03/86

(46) 05/07/88. Bul tl 17

(71) Design and Research Institute Mosgazniiproekt and Moscow Evening Metallurgical Institute

(72) K.F.Rider, R.L.Relin, E.N.Shurkin, V.A.Davydov and A.G. Zenkovsky

(53) 628.54 (088.8)

(56) German Patent N 2508810, Cl, F 23 G 7/00, 1975.

USSR Author's Certificate No. 1135970, cl. F 23 G 7/06, 1983.

(54) METHOD OF TERTY DECOMPOSITION OF PROMOTIONAL DRAINS AND DEVICE FOR ITS IMPLEMENTATION

(57) The invention relates to the field of metallurgical heat engineering and can be used to purify water polluted by industrial effluents resulting from technological processes. The purpose of the invention is to increase the effectiveness of the disposal process of the drained effluent. Gas and air enter the chambers i 5 filled with a refractory nipple 2 of which form an air-gas mixture, which partially burns. The 06 combusted waste products enter the mixing chamber 12, and the industrial streams dispersed by compressed gas are also supplied to the Topjm. After heat treatment, the formed products enter the afterburning chamber 10 filled with the refractory nozzle 11. As a result of the reduction of the residence time of the combustion products in the high-temperature zones, the formation rate of nitrogen oxides decreases. 2 sec. f-ly, 2 ill.

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The invention relates to metallurgical heat engineering and can be used in metallurgical, energy, and chemical processing plants for purifying water contaminated with industrial effluents, as a result of technological processes.

The aim of the invention is to increase the efficiency of the process.

Figure 1 shows a device that implements a method for thermally neutralizing industrial discharge; figure 2 - section in figure 1.

YcTpoiiCTBo for thermal disposal of industrial effluents contains two chambers 1 filled with a refractory nozzle 2. The gas supply nozzles 4 are tightly installed in the lids of 3 chambers 1. Between chambers 1 an air collector 5 is placed, which communicates with chambers 1 by means of holes 6, made in partitions 7, which are divided into each of

chambers 1 with an air collector 5. Air is supplied to the collector 5 by means of nozzles 8, installed 1X at the upper end 9 of collector 5. In the center of the collector 5 along its axis there is a afterburning chamber 10 filled with a refractory nozzle 11. Under the chambers 1, the collector 5 and the chamber 10 houses a mixing chamber 12, separated from them by a partition 13. The chambers 1 and 10 are connected to the mixing chamber 12 via holes 14 and 15. At the base of the chamber 12, a nozzle GB is installed, which provides for spraying with compressed gas The wastewater supplied through the pipe 17. Compressed gas is supplied through the pipe 18. In the side walls of the chambers 1, the hatches 19 are made necessary for igniting the device.

The device, the recovery method of thermal disposal of industrial effluents, operates as follows. .

After supplying gaseous fuel through nozzles 4 and air through nozzles 8 using ignition devices not shown, installed in hatches 19, ignition is carried out, gas-air mixture in chambers 1. Gas mixture is formed in chambers 1 by mixing in a refractory layer nozzles 2 gaseous top

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The lead entering the campra 1 through the nozzles 4, the C. -flow of air supplied to these chambers from the air manifold 5 through the openings 6. The coefficient of air flow (about) created by the gas-air mixture should be as follows. in order to ensure burnout of gaseous fuel entering through pipes 4 and 18 and burning off harmful impurities of industrial effluent.

Chambers 1 crawl out so that the refractory nozzle has a height of 5-6d, where d is the reduced diameter, the digged diameter of the particle of the crushed refractory material, which allows to ensure that the gas and air flows are smogging, but the complete burnout of the fuel within the refractory nozzle 2 cannot be completed. The fuel-air mixture that is unburnt in the chambers, through holes 14 enters the mixing chamber 12, where it mixes with the drains and burns. Products of complete combustion through (The holes 15 enter the layer 11 of the catalytic material of the chamber 10, from where they are released into the atmosphere. After heating the refractory nozzles 2 and 11, the effluent is fed through the nozzle 17 and compressed gas through the nozzle 18. The congested heated drains are heated, evaporated Partial burnout of toxic impurities contained in these drains occurs.The products of combustion formed in chamber 12 enter holes through chamber 15 into chamber 10, where low-temperature post-combustion of products of incomplete combustion occurs. wounds, the formation of which increases with increasing supply of industrial drains in the refractory nozzle 11.

The device, which implements the method of thermal disposal of industrial effluents, is stopped by stopping the supply of gaseous fuel through pipes 4 and 18, industrial waste pipes through pipe P and after the refractory nozzles 2 and 11 have cooled down by turning off the air.

Example. Gas at a pressure of 1.3 kPa is supplied to the fuel / air mixture chambers filled with a layer of crushed refractory, the filling height of which is 5-6 d, where d is 20 mm. The temperatures generated in these chambers reach 1300 ° C. Air for combustion is supplied through Pat3

cuttings at a pressure of 0.5 kPa. Industrial streams are sprayed with gas having a pressure of 10.0 kPa. The temperature in the zone of thermal disposal of industrial wastewater is afterburning does not exceed

and in the 900 ° P zone.

The content of nitrogen oxides in the combustion products does not exceed 180 mg / m as measured.

Filling the chambers of the preparation of the fuel-air mixture with a refractory nozzle allows to intensify the mixture formation and combustion. As a result of reducing the residence time of the combustion products in the high temperature zones, the intensity of formation of nitrogen oxides decreases.

The supply to the mixing chamber of the heated air-fuel mixture allows to intensify the process of heating and evaporation of industrial effluents sprayed with compressed gas, thereby providing a deep disposal of waste.

The feed to the chambers filled with a layer of refractory packing of lean fuel in the air mixture reduces the temperature in the combustion zone, which creates conditions for reducing the formation of nitrogen oxides in these chambers.

The afterburning of products of incomplete combustion in the first afterburning chamber filled with a refractory nozzle makes it possible to increase the specific consumption of industrial effluents due to low-temperature combustion in the layer of catalytic material.

Making the air manifold in the form of an annular gap between the chambers of the air-fuel mixture and the afterburning chamber preheats the air in this manifold and simultaneously protects the layer of the refractory nozzle from overheating.

A decrease in the temperature level in the mixing chamber and in the afterburning chamber leads to a significant decrease in the formation of nitrogen oxides, the formation rate of which depends on the temperature in the combustion zone exponentially.

Studies have shown that filling the combustion chambers with a layer of crushed refractories with a height of more than 6d can lead to complete burnout of the fuel in these chambers and, as a consequence, an increase in the yield of nitrogen oxides.

Performing backfill of crushed refractories with a height of less than 5d leads to poor mixing of gas streams and possible. spirit and, consequently, the lack of sustained combustion in chambers 1 and 12.

The use of the invention makes it possible to increase the efficiency of the process by providing neutralization at lower temperatures, as well as to reduce the formation and release of nitrogen oxides formed during combustion.

Claims (2)

1. A method for the thermal disposal of waste streams, including the mixture formation and combustion of the gas mixture in the mixture, the supply of sprayed effluents into the combustion products, followed by evaporation and heat treatment, and after-burning of the mixture, which, in order to increase the efficiency of the process, carry out partial combustion fuels at the refractory nozzle, the resulting products of incomplete combustion are mixed with dispersed drains and the mixture is directed to a low-temperature afterburning. 2. A device for thermally decontaminating industrial effluent, containing the preparation and combustion chambers of the gas-air mixture and the firing chamber filled with a fireproof pad, which is different in that it is equipped with a mixing chamber adjacent to the preparation chambers to make the process more efficient. - the gas-air mixture and the afterburner chamber, and the preparation and combustion chamber of the gas-air mixture and the afterburner chamber are separated by an annular air collector, while the fireproof gas-and-combustion chamber nozzle shnoj mixture made of a refractory material crushed height of 5 ... 6 mentioned average particle diameter of 55 gsypke. 40 45 FSh.2