SU977902A1 - Method of heat neutralizing of waste waters - Google Patents

Description

one

The invention relates to methods for treating wastewater from volatile organic substances, such as methanol, and can be used in the chemical and petrochemical industries.

The known method of thermal treatment of wastewater containing volatile organic substances, including evaporation of wastewater and burning Q vapor-air mixture f O.

The disadvantage of the method is that it does not allow intensive combustion of the vapor-air mixture, since the waste water vapor serves ts to the incandescent combustion products without first mixing it with air necessary for oxidation.

Closest to the proposed technical essence and reach-. 20 my effect is a way; layered burning of liquid waste by bar-: storing a part of the oxidant through a layer of combustible waste, partial hedgehog.

Gania of evaporated waste and the supply of secondary oxidant to the incineration zone. In this way, with the 14th assurance of the sustainable co-incineration of combustible and low-reactive waste, the bubbling through the bed of the latter. an oxidizing agent is supplied, and combustion products of combustible waste are fed into the superlayer space. A mixture of air with recirculated combustion products t is used as an oxidizer. The disadvantage of the known method is that the process of mixing the secondary oxidizer and combustible evaporated waste occurs simultaneously with the combustion process. To achieve complete intensive combustion with this method, it is necessary to develop the space in which combustible waste burns, to create conditions for intensive mixing with the help of various devices, which complicates the design of the furnace installation. The purpose of the invention is to increase the efficiency of the process by simplifying and fully burning the evolving volatile organic substances during the disposal of wastewater containing volatile organic substances. This goal is achieved by the fact that in the method of thermal disposal of sewage, which includes bubbling sewage with air, evaporating them with heat from the exhaust gases and burning the vapor-air mixture, bubbling is carried out with an excess air ratio of 1 to T2-11.2 ° T. . During heat treatment of wastewater with a content of volatile organic substances less than 10%, full intensive combustion according to the results of experimental data obtained in the laboratory, is achieved with an ardoux excess coefficient, 2. If waste water with a content of volatile organic substances of 15-25% is neutralized, then the coefficient of excess air is at least 1.12 (according to experimental data). This difference in excess air ratios is due to the fact that air-vapor mixtures of wastewater with less than 10 volatile organic matter content contain more water vapor than in vapor-air, wastewater mixtures with a high content of volatile organic matter (15-20 vapor degrades the quality of the mixing of organic volatile substances with air. Example: Thermal disposal of wastewater from the Schelkovsky UGS (underground gas storage) is carried out in laboratory conditions. The main volatile substance in waste water The wastewater of this storage facility is methanol. In the wastewater of underground gas storage facilities, the content of volatile organic substances fluctuates in wide Redelahs from 5 to 25. The experiments are carried out as follows. air is mixed with evaporating water vapor and volatile organic substances. Then the vapor-air mixture is fed into the hot products of the combustion of gas fuel. The fuel used is propane-butane th mixture. An injection burner with an active air jet is used to burn the fuel. The quality of the burnout of organic substances is checked by chemical analysis of waste combustion products using a chromatograph. The steam-air mixture is supplied to the furnace at the place where the propane-butane mixture is completely burned out. The experimental data are tabulated.

As can be seen from the table, the excess air ratio must be at least

Claims (2)

1.12 when the content of volatile organic substances in the wastewater is 25, and when the content of volatile organic substances is less than 10, the coefficient of air loss should be 1.2. Under these conditions, complete combustion is ensured. The use of the proposed method of thermal disposal of wastewater containing volatile organic matter. compared to existing ones, it allows to simplify the process and reduce capital and operating costs, as well as reduce the overall dimensions of the installation. The invention of the method of thermal disposal of wastewater, including the bubbling of wastewater with air, evaporating them with heat from waste gases and: burning the vapor-air mixture, characterized in that, in order to improve the efficiency of the process during the disposal of wastewater containing volatile organic substances | with an excess air ratio of 1.12-1, 20 k theoretically necessary for the complete combustion of organic substances. Sources of information taken into account during the examination 1. Authors USSR Childhood No., cl. F 23 G 7/00, 197. 2. USSR author's certificate №, cl. F 23 G 7/0, 197 (prototype).