SU1065659A1 - Method of fire neutralization of sewage containing volatile organic matters - Google Patents

Description

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The invention relates to the disposal of industrial wastewater from volatile organic substances, for example, methanol, benzene in the chemical, oil and gas industry, and can be used for the disposal of wastewater from underground gas storage facilities.

There is a method of fire disposal of wastewater containing volatile organic substances, including evaporation of wastewater (and afterburning) of the vapor-gas mixture in the products; combustion of fuel flj.

However, the method does not provide for operations aimed at reducing the yield of nitrogen oxides during neutralization of waste: sewage.

The closest to the technical essence and the achieved effect to the invention is a method of fire disposal of wastewater / water, including preliminary fire treatment of moans and afterburning, the resulting vapor-gas mixture in the flow of products of combustion of organic fuel 23 .. ,,:.: ,,,,::. //; -. ,;

According to a well-known method, with the purpose of reducing the yield of nitrogen oxides, pretreatment of effluent and afterburning of pb; Douche of a steam-gas mixture is implemented in: spun product streams; combustion of organic fuel, with ni eABapTeline treatment of the effluent is carried out in a reducing atmosphere at tL 0.85-0, -9 and the temperature of the combustion products BOO-8OO C, afterburning is carried out in an oxidizing atmosphere at a conductivity, the excess air, 05- : l.: ..;. ;;:; ; ..,;.: Fire disposal of sewage. Is carried out in separate streams of combustion products of organic TomiHBa.v,.: /...-. ; - - -. ..

The disadvantage of this method is the combustibility of the process, since it occurs in two zones: reducing and then oxidizing. It requires increasing the combustion zone and complicates the design of the furnace, since each zone must be equipped with an individual supply of fuel and oxidant. -. .:. ;. . ,:.: The aim of the invention is to simplify the combustion process and reduce the yield of nitrogen oxides by lowering the combustion temperature of the fuel.

The goal is achieved by agreeing with the wastewater decontamination, howling volatile organisms including the supply of gaseous fuel, oxidizer and the vapor-gas mixture of waste water and burning it in a swirling flow of the combustion products of the gas.

with steam-gas mixture, the amount of which exceeds the amount of gaseous fuel by 3.3-3.96 times.

The gas-vapor mixture, added to the gaseous fuel, contains a significant amount of water vapor and beyond. by their presence in the fuel, the combustion temperature is reduced and the content of nitrogen oxides in the decontamination products decreases.

Significant reduction of nitrogen oxides in the products of combustion and disposal of wastewater occurs in cases where the amount formed during the evaporation of wastewater vapor gas mixture mixed with gaseous fuel exceeds the fuel consumption by more than 3.3 times the addition of the vapor gas mixture to gaseous fuel in the amount of less than 3.3 times.

When adding the gas-vapor mixture to the gaseous fuel in an amount less than 3.3 times its consumption, there is a slight decrease in nitrogen oxides.

If the amount of the gas-vapor mixture added to the gaseous fuel exceeds its consumption by 3.96 times, the burning process of the 1H deteriorates significantly, and the content of carbon monoxide in the combustion products exceeds the maximum permissible norms.

 PRI me R. Under laboratory conditions, firing disposal of wastewater from the Shelkovsky UGS (underground gas storage) was performed. The filtered wastewater was fed to a heat exchanger, in; which carried out the distillation of methanol to its concentrations in the solution of 5-7%. After the distillation of methanol, wastewater containing benzene, methanol, and others. The volatile organic substances evaporated into the heat exchanger with the heat of the waste products of the combustion of gaseous fuels. As the gaseous fuel used prbpan-butane mixture. When burning fuel, an injection burner with an active air jet was used. Part of the vapor-gas mixture formed during the evaporation of wastewater was directed to the pipeline through which gaseous fuel was fed to the burner.

In the pipeline, the vapor-gas mixture was mixed with the fuel, in the burner - with air, then through the burner the resulting mixture was fed to the furnace, where it was burned in a swirling flow of combustion products.

The remainder of the evaporated wastewater was fed to the incandescent pro- cesses, the combustion products, in which the combustion of harmful organic substances occurred.

The quality of combustion was checked by the chemical analysis method of the combustion products using a chromatograph (for CO content) and the content.

nitrogen oxides were determined by colorimetric method.

The experimental data are tabulated.

Consumption of gaseous fuel, 9.81 7.36 7.36 9, l / min. Consumption of a vapor-gas mixture added to gaseous fuel, l / min 15.1 24.4 27/5 36 I Ratio of consumption of a vapor-gas mixture to gaseous fuel, 1.98 3; 72 3, l / min. Maintenance of nitrogen oxides, mg / M 0.819 0.23 avi2 a, COMPOUND carbon oxides, 15.5 g / m As can be seen from the table, when mixing gas-vapor mixture with, fieidoobramen fuel before burning it significantly reduces ooder-; 1cation of nitrogen oxides in the productsX-.,. :; .....-..- Vv -,.;,; /. In the proposed method, it is highly neutralized. There is only O / S combustion zone - oxidative, whereas in the known, there are two effects 9.81 7.36 7.36 9.1 6 0.936 0.468 0.234 0.18 8 8 8 9 9 burning: oxidative and restore telna ...: ,,. . Using the proposed method of firing, disposal of wastewater containing volatile organic substances, compared with the known, allows to simplify the process and reduce capital and operating costs, as well as reduce the overall dimensions of the installation.

Claims (1)

The method of fire disposal of wastewater containing summer OTHER ORGANIC SUBSTANCES, including the supply of gaseous fuel, an oxidizing agent and a gas-vapor mixture of wastewater, water and its afterburning in a swirling flow of combustion products, gaseous fuel, characterized in that, in order to simplify the combustion process and reduce the yield of nitrogen oxides by lowering the combustion temperature of the fuel, before supplying gaseous fuel to the furnace, it is mixed with a gas-vapor mixture, the amount of which exceeds the amount of gaseous fuel by 3.3-3.96 times.