Device for post-combustion of waste gases

 

(57) Abstract:

Usage: in the metallurgical, chemical, electric heating industry for neutralization of waste gases emitted, in particular, when the brick-kiln (lining) and other ceramic products. The inventive device for post-combustion of waste gases includes an injector nozzle for the supply of waste gases, mixer, burner Tonel and the secondary combustion chamber. The injector is provided with an axial cylindrical insert with a nozzle and a gas nozzle located inside the insert. Burner Tonel made in the form of the diffuser adjacent to the injector, having a length of 8 to 20 calibers diameter of the mixer and out of the expanding part in the burning chamber. 1 Il.

The invention relates to the protection of the environment and can be used in metallurgical, chemical, electric heating industry for neutralization of waste gases emitted, in particular, when the brick-kiln (lining) and other ceramic products.

A known method of burning waste gases and a device for its implementation, in which the device for combustion of waste gases contain injector (diffuser) with a pipe for supplying air to the burner tunnel.

The reaction mixture is optimal for the full post-combustion of combustible gases must possess thermal energy, providing the temperature of the flame in the combustion is not below 1000-1300aboutWith the excess oxygen from the stoichiometric ratio not lower than 10-12% in the field of post-combustion nonflammable gases.

To obtain the parameters of the reaction mixture through an air injector is practically impossible, since the creation of the necessary excess of oxygen, the combustion temperature is obtained underestimated, and at a high temperature torch the excess oxygen content is not enough.

The purpose of the invention, the oxidation of combustible gases.

The aim is achieved in that the device containing the injector nozzle for the supply of waste gases, mixer, burner tunnel and the secondary combustion chamber, is further provided with pipe supply of oxygen, and the injector is equipped with axiales cylindrical insert with a nozzle and a gas nozzle located inside the insert. Burner tunnel is made in the form of the diffuser adjacent to the injector, having a length of 8 to 20 calibers diameter of the mixer and out of the expanding part in the burning chamber. Supply device pipe supply color the gases are not balanced with nitrogen of the air, consuming heat for heating). The oxygen flow injected through the nozzle in the injector, is divided by a cylindrical insert the nozzle into two parts, one of which is designed for the combustion of additional fuel in the optimum ratio, and the other on the post-combustion gases.

If, for example, as additional fuel is natural gas, the flow distribution allows you to burn fuel with the formation of high temperature flame with a temperature above 2000aboutWith located on an axis extending burner tunnel, made in the form of diffuser length 8-20 calibers mixer injector. Energy is another part of the oxygen flowing in the circular gap between the burner tube and the insert, is used for injection box waste gases, resulting in a mixture of oxygen and waste gases with the oxygen content of more than 12% When moving along the walls of the burner tunnel mixture perceives radiation high temperature flame, contact with preheated to a temperature of 1000-1300aboutWith the walls of the burner tunnel. As a result, in the beginning of the burner tunnel begins burning of combustible hydrocarbons, including trudnosgoraemyh.

Storeto to a temperature of 1000-1300aboutWith the consumption of additional fuel, and radiation from the axial torch having a temperature above 2000aboutC. On the walls of the burner tunnel is the oxidation of waste gases. The minimum length of the diffuser 8 calibers mixer due to the completion of the process of mixing, known from theory of calculation of the injectors. The maximum length 20 calibers causes the end of the afterburning process, including nonflammable gases, such as benzpyrene, to carbon dioxide and water. To improve post-combustion of the burner wall of the tunnel should consist of materials having catalytic properties, for example of sintered aluminum oxide and chromium.

The drawing shows a device for post-combustion of waste gases.

The device consists of an injector 1 having air inlets 2, oxygen 3, as well as waste gases with 4 valves 5, 6, 7. The injector 1 has a mixer 8 and is provided with a cylindrical insert 9 with the nozzle 10 and the gas nozzle 11. Between the injector and the nozzle is formed an annular gap 12. The injector adjacent the burner tunnel 13, made in the form of the diffuser 14 length 8-20 calibers diameter 15 of the mixer 8, with output expanding part of the cone 14 into the chamber 16 digesta works as follows.

Camera 16 post-combustion pre-heated to a temperature of 1000-1200aboutWith by burning additional fuel in the air (mostly), is supplied through the gas nozzle 11, the insert 9 and the injector 1, respectively. The amount of air set in an optimum ratio to the auxiliary fuel by regulating the flow rate of the valves 5 and 6, if necessary, mixing with air oxygen to reach the desired temperature. Simultaneously with the heating of the afterburner is heated walls 17 of the cone 14 so that the front of the start of combustion is approaching the injector 1 at a distance of 3-5 calibers diameter 15 of the mixer 8 (increasing to zoom torch proportion of oxygen for combustion of fuel through valve 6). Due to radiation from the flame and from the heated chamber 16 of the combustion chamber wall 17 of the cone 14 are heated to a temperature of at least 1000-1300aboutWith, and then through valve 7 open access to the injector 1 of the waste gases through the pipe 4. At the same time interrupt the air supply valve 5, using the oxygen flowing through nozzle 10 for combustion of auxiliary fuel and oxygen flowing through the annular gap 12 for injection and combustion of waste gases. The last Pro is For full averaging mixture of sufficient length, equal to 8 gauge diameter 15 of the mixer 8. Wall 17 of the diffuser 14 is preheated to a temperature of 1000aboutAlready at a distance of 5 calibers diameter 15 of the mixer, and they started to happen oxidation of combustible gases with a large excess of oxygen. Further, the degree of afterburning increases, as of the end of the mix, and increases the temperature of the walls 17 of the diffuser 14 at least up to 1300aboutWith from burning oxygen torch auxiliary fuel burned in the optimal mode by separation of a part of oxygen from the total number of insert 9 with the nozzle 10. Thus, the walls 17 of the diffuser 14 and creates all conditions for post-combustion of combustible gases, namely temperature 1300aboutWith an excess of oxygen over 12% and the material of the walls 17 having catalytic properties. It was established experimentally that the length of the diffuser 14, equal 8-20 calibers diameter 15 of the mixer 8, the combustion of combustible components is fully (including benzpyrene with the degree of 99.98%).

DEVICE FOR post-combustion of WASTE GASES containing the injector nozzle for the supply of waste gases, mixer, burner tunnel and the secondary combustion chamber, characterized in that the device is provided with a nozzle for supplying the oxygen is on the inside of the insert, moreover, the burner tunnel is made in the form of the diffuser adjacent to the injector, having a length of 8 to 20 caliber-the diameter of the mixer and out of the expanding part in the burning chamber.

 

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