SU1599622A1 - Installation for utilizing heat in thermal neutralizing of waste water - Google Patents

Abstract

The invention relates to heat engineering and can be used in installations for the thermal disposal of wastewater containing volatile impurities and mineral salts. The aim of the invention is to improve the economy by reducing the fuel consumption per kiln. The waste gas path between the furnace 2 and the contact preheater 7 is divided into two parallel branches, one of which parallel to the preheater 3 of the steam-air mixture is connected along the heating side to the surface gaseous heat exchanger 6, and the contact preheater 7 is divided into two successive stages, the second of them is input along the gas path, it is connected to the outlet on the gas side of the gas-water heat exchanger 6. 1 sludge.

Description

The invention relates to a heat exchanger and can be used in installations for the thermal decontamination of wastewater containing volatile organic matter and mineral salts.

The purpose of the invention is to increase efficiency by reducing fuel consumption per kiln.

The drawing shows a diagram of the installation for heat recovery during thermal neutralization of waste: water.

The installation contains a pre-evaporation unit 1, the output of which is gas-assisted is connected to the furnace 2 and the output to the heated medium of the preheater 3 vapor-air mixture. The flue gas path of the furnace 2 is divided into two branches 4 and 5, one of which includes the heater 3 of the steam-air mixture and the other surface gaseous heat exchanger 6. The heating medium of the heater 3 is connected to the entrance of the first stage of the gas heater 7 along the gas path, and the output is on the heating €; th / environment of the heat exchanger 6 syudenen. with the passage of the second in the course of the gas stage contact heater 7.

Tract 8 of waste water is connected to the inlet for the heated medium of the pre-evaporation apparatus 1, and the outlet is connected to the inlet for the heated medium for the contact preheater 9. The outlet for the heated medium for the contact preheater 7 is connected to the inlet for the water of the furnace 2 by tract 10, Air path 11 is connected trkktu 12 vapor-air mixture to preheater 3,

The installation works as follows ..

Sewage water through line 8 enters the pre-evaporation unit 1.

Due to the heat of the steam-air mixture, heated by the exhaust gases of the furnace 2 in the heater 3 of the steam-air mixture, in apparatus 1 of the preliminary evaporation, partial evaporation of waste water takes place. At the same time, volatile organic components pass into the vapor state. Before heating, air is introduced into the vapor-air mixture through the path 11.

After the pre-evaporation unit, part of the vapor-air mixture

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It is fed to the evaporation furnace, and partly for heating in the preheater 3 and further to the pre-evaporation apparatus 1.

The waste water left after pre-evaporation, containing high-boiling organic components and mineral salts, is sent to a contact preheater, where the waste water is additionally heated, and then to the surface gas heat exchanger 6, where the water is heated to the saturation temperature or slightly higher, and then fed to the kiln for incineration. The waste products of combustion from the furnace 2 through two parallel paths 4. and 5, respectively, are fed to the heater 3 of the steam-air mixture and the surface gas outlet and heat exchanger 6, and then to the nepByjo and the second stage of the contact heater. Such an installation scheme allows, due to the heat of the exhaust gases, to heat water up to the saturation temperature or slightly to overheat it before being fed into the furnace. At the same time, the temperature of the exhaust gases, after the surface gas-water heat exchanger, will be slightly lower than after the preheater of the vapor-air mixture, since the temperature of the waste water at the inlet to the heat exchanger will be obviously lower than the temperature of the vapor-air mixture at the inlet to the vapor-air heater. The displacement of two streams of waste gases 1 in a contact preheater is carried out after the first step along the gas flow, to the input of which the waste gases arrive after the steam-air mixture preheater. Moreover, the size of the heating surface of the first stage of the contact preheater is chosen so that the temperatures of the exhaust gases after the first stage — the contact preheater and the gas-water heater are the same. Mixing gases with different temperatures would lead to energy losses in the contact preheater and a decrease in its thermal power.

The implementation of the invention makes it possible to reduce fuel consumption during the decontamination process by increasing the degree of heat utilization of the decontamination products.

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Claims (1)

Claims Installation for heat recovery. in the thermal treatment of wastewater, containing a pre-evaporation apparatus, a thermal treatment furnace, a steam-air mixture preheater and a contact preheater, which, in order to increase efficiency by reducing the fuel consumption per kiln, the exhaust gas path 159 1599622 between the furnace and the contact heater, it is divided into two parallel branches, one of which is parallel to the steam-air heater and a gaseous heat exchanger is connected along the heating side, and the contact heater is divided into two successive stages, the second of them is connected to the gas-side outlet gas heat exchanger.