Bake for afterburning of flue gases

 

The invention relates to furnaces for afterburning of flue gases and can be used to solve environmental problems incineration of household and industrial waste. Effect: simplified construction and intensification of post-combustion of combustible components in the flue gas. Furnace cyclone-type for post-combustion flue gases comprises a cylindrical housing, a conical bottom with a device for the collection of ashes, cover with a drain to remove products of combustion and installed tangentially to the cylindrical housing of the device for introducing the flue gas into the furnace. Device for introducing the flue gas is made in the form of a mixer ejector type, the axis of which a plasma torch, the entraining gases plasma jet of air as oxidant. 2 Il.

The invention relates to furnaces for afterburning of flue gases and can be used to solve environmental problems incineration of household and industrial waste.

Waste incineration flue gases are formed, which contain products of incomplete combustion and thermal decomposition.

In this regard, of great importance is the organization of the post-combustion of combustible gases contained in the flue gas.

Closest to the present invention by the combination of features is kiln afterburning of flue gases (US 3817712, F 23 G 7/06, 18.06.1971). It consists of a cylindrical afterburners cyclone-type, pipe to enter the flue gas and the burner for supplying combustion products of the fuel, installed tangentially to the body of the furnace, a pipe for exit of products of combustion and nozzle for removal of ash.

The disadvantages of this furnace is the presence of two tangential nozzles - input flue gas (exhaust hole) and products of fuel combustion (from burner), and insufficient efficiency of combustion of combustible components in the flue gas. One of the conditions of intensive combustion of gaseous substances is a good mixing of the combustible components of the oxidant is oxygen. Known furnace design for afterburning of flue gases does not provide high mixing. Flue gases entering cylindrica is carried out in a cylindrical housing also tangentially and in the same direction. These two streams of gases moving in a spiral, twisted in the same direction. As the gases move in the same direction, velocity gases are aligned and thereby deteriorates the mixing. At the same time, the speed of gas flow is not great, therefore, is not large value of the Reynolds number, and therefore mixing of the gases ineffective.

The invention aims to simplify the design, intensification of post-combustion of combustible components in the flue gas.

To solve the formulated problem in cyclone-type furnace for post-combustion flue gases containing cylindrical body, a conical bottom with a device for the collection of ashes, cover with a drain to remove products of combustion and installed tangentially to the cylindrical housing of the device for introducing the flue gas into the furnace, the device for introducing the flue gas is made in the form of a mixer ejector type, the axis of which a plasma torch, the entraining gases plasma jet of air as oxidant.

The tangential location of the device to enter the flue gases to the cylindrical furnace housing need for the separation of solid non-combustible substances from flue gases. The location of the torch axis will sosite the I air-oxidant sucks flue gases, and in the ejector is heat treatment (destruction and oxidation) of the components in the composition of the flue gases. Due to the high speeds of the intense mixing of the gases.

The plasma torch performs the role of the working nozzle of the ejector, which gives work (ejecting) the flow of high temperature (5000-6000(C) plasma jet air oxidant. The torch has two functions: 1 - the source of thermal energy, 2 - operating the nozzle of the ejector.

Bake for afterburning of flue gases is shown in Fig.1 - General view and in Fig.2 is a cross section along a-A. It consists of a cylindrical body 1, the conical bottom 2, cover 3, the pipe for the escape of gases 4, the plasma torch 5, mixer ejector type 6.

The oven works as follows: flue gases pass into a mixer ejector type 6 through the nozzle 7. In the plasma torch 5 through a connection pipe 13 enters the air, where it is heated in the electric arc to the plasma state, and a plasma current of air as oxidant through the nozzle 10 is fed into a mixer ejector type 6. In the confuser 12 mixer 6 flue gases are pre-mixed with the plasma jet of air as oxidant and carried it comes in a cylindrical part 11 of the mixer 6.

The cultivation temperature of the mixture of gases is produced by changing current load of the plasma torch. With certain specified temperature, the mixture of gases is fed into a cylindrical furnace body 1, which is twisted in a spiral flow of gases, separated from non-combustible solid particles which are collected in the nozzle 9, is fed into the pipe 4. The combustion products are removed from the furnace through the nozzle 8. Destruction and afterburning of flue gases begins in the mixer 6, and ends with the ignition in the furnace.

Thus, application of the proposed design of the furnace post-combustion flue gases provides high mixing of the flue gases and plasma jet of air as oxidant, resulting in the intensification of the process of afterburning, and also eliminates the need for supplying additional air to the burner for receiving products of combustion with high temperature, since some air is spent on fuel combustion. The application of this furnace design allows you to use the kinetic energy of the plasma jet of air as oxidant in the mixer ejector-type suction flue gases, as well as the simplified design of the furnace.

Additional positive properties of the proposed design of the furnace afterburning of flue gases include:

1. High temperature (5000-6000(C) plasma jet air-oxide is Dorogi and other (The temperature of the combustion of natural gas with air - 1875With, kerosene - 1930With gasoline - 1970C.) [A. M. Kitaev, J. A. Kitaev. Reference book welder. M.: Mashinostroenie, 1985, page 173].

2. All particles of the flue gases are forced to pass through the high temperature zone of the plasma jet torch air as oxidant, in which the temperature of 5000-6000C.

Claims

Furnace cyclone-type for post-combustion flue gases containing cylindrical body, a conical bottom with a device for the collection of ashes, cover with a drain to remove products of combustion and installed tangentially to the cylindrical housing of the device for introducing the flue gas into the furnace, characterized in that the device for introducing the flue gas is made in the form of a mixer ejector type, the axis of which a plasma torch, the entraining gases plasma jet of air as oxidant.

 

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