SU1315739A1 - Device for thermal decontamination of waste gas - Google Patents

Abstract

The invention relates to environmental protection and can be used in the chemical, petrochemical, oil refining, engineering and other industries. The purpose of the invention is to increase the efficiency of gas cleaning by reducing the flow of contaminated gas between the cavities of the switching device. A thermal device for decontamination of waste gas includes a switching device for changing the direction of movement of waste gas, made in the form of a four-way valve, the casing of which on the hollow shaft has a floor with slits 10, which are located along the perimeter of the valve end, for supplying compressed air to the places of fixed valve position. The shaft cavities and the dampers are interconnected by interconnecting windows. Compressed air is fed into the cavity of the valve through the hollow shaft I1 and the window 12, which through the slots 10 in the valve enters the fixed position of the switching device. The compressed air creates an air curtain that prevents the waste gas from flowing into the cavity of the switching device with the purified gas, while ensuring that the flap and sealing points are cooled. 1 hp f-ly, 2 ill. (L Od SL 00; with a

Description

one

The invention relates to environmental protection and can be used for the thermal disposal of waste gases in the chemical, petrochemical, petroleum, engineering and other industries.

The purpose of the invention is to increase the efficiency of gas purification by interfering the flows of contaminated gas between the cavities of the switching device.

Figure 1 shows a device for the thermal deactivation of waste gas, a general view; figure 2 - switching device, a general view.

The device for thermal disposal of waste gas consists of a heat-insulated body I with dividing partitions 2, forming chambers 3 with gas-permeable nozzles 4 placed in them and burners 5, inlet and outlet nozzles 6 and switching device 7.

The switching device 7 is made in the form of a four-way valve and consists of a housing 8, a hollow valve 9 with slots 10, a hollow shaft 11, the cavity of which communicates with the valve cavity through the windows 12, the retainers 13, the inlet and outlet nozzles 6.

The device for thermal waste gas disposal works as follows.

The cold waste gas through the switching device 7 and the inlet 6 is supplied to the gas-permeable nozzle 4. In the latter, the waste gas is heated by the heat accumulated in the nozzle in the preceding period, after which the waste gas enters the chamber 3, where the burners 5 are located. Heated waste gas the gas is mixed with the hot combustion products of the fuel, heated to a predetermined temperature of neutralization and after a certain period of time necessary for the oxidation of toxic impurities, enters the second gas-permeable the nozzle 4 heats it, then through the outlet 6 and the switching device 7 is directed to the atmosphere.

Four-way valve works as follows.

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By changing the direction of movement of the waste gas, the valve 9 is turned with the help of an actuator 90 ° until it stops in the latches

13. Cold waste gas is fed to the four-way valve and through the inlet pipes 6 enters the device for thermal neutralization. After thermal neutralization, hot

the gas enters the blackhouse valve and is emitted into the atmosphere. Compressed air is supplied to the cavity of the valve 9 through the hollow shaft 11 and the communicating windows 12, which through the slots 10 in

the end face of the valve 9 enters at the fixed position of the valve. The compressed air, entering the fixed position of the valve, creates an air curtain that does not

allows the waste gas to flow into the chamber with the latches 13 and the flap 9 into the valve cavity with the purified gas.

Cold compressed air supply

along with the elimination of overflows arising due to the pressure difference between the valve cavities, increases the reliability of the valve when hot gases pass through it,

providing cooling of the hollow valve and sealing point.

The use of a four-way valve with an air seal in the device for the thermal disposal of waste gas reduces the emissions of harmful substances polluting the environment by eliminating the flow of hazardous gas into the purified,

Increases the degree of gas purification in the device.

The use of a four-way valve greatly simplifies the operation of the device, since instead of eight valves and actuators, as in the known scheme, only one valve and an actuator are used.

Claims (2)

1. A device for thermal disposal of waste gas containing a heat-insulated body with partition walls forming chambers with gas-permeable nozzles placed in them, nozzles for inlet and outlet of gases, a burner and a switching device, so as to increase the efficiency of gas cleaning by reducing the flow of contaminated gas between the cavities of the switching device, the latter is made in the form of a four-way valve, in the case of which the floor is installed on the hollow shaft baby elephant with races 157394 slits placed around the perimeter of its end for supplying compressed air to the fixed valve positions. g 2. A device according to claim I, characterized in that the shaft cavities and the shutters are interconnected by interconnecting windows. Editor M.Blanar FIG. I Compiled by T. Lepahina Tehred i.Popovich Proofreader M.Sharoshi Order 2338/39 Circulation 494Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4