RU1815491C - Cyclone furnace - Google Patents

Abstract

Usage: in the metallurgical and other industries when preparing a coolant for drying units and other consumers. SUMMARY OF THE INVENTION: A cyclone furnace contains a cylindrical body forming an end chamber with an outlet pipe with end walls and an air supply pipe mounted in the combustion chamber along the axis of the outlet tube and connected to an overpressure device. Burners are tangentially mounted in the lower part of the cylindrical body. A section of the outlet of the air supply pipe is located from a section of the inlet of the outlet pipe at a distance determined from a mathematical expression. A stream of air in the area between the air outlet. the cooling pipe and the inlet of the outlet pipe injects combustion products from the working space of the furnace and enters the outlet pipe. 2 ill. sf yo

Description

: The invention relates to a device for burning fuel and can be used in the metallurgical and other industries in the preparation of coolants for chamber dryers, drying drums, thermal furnaces, heating chambers and other consumers using lower temperatures of the heating medium for carrying out the process (below 1100 ° C for high calorific gases, e.g. natural or below 800 ° C for low calorific gases).

An object of the invention is to provide autonomous smoke removal from a furnace by utilizing the energy of dilution air.

In FIG. 1 shows the proposed firebox, a longitudinal section; figure 2 is a section A-Ana figure 1.

The cyclone tozhia contains a lined cylindrical body 1, forming a combustion chamber 4 with end walls 2 and 3. A pipe 5 is installed on the end wall 2 at the outlet of the combustion chamber 4. An air supply pipe 6 is inserted through the end wall 3 into the combustion chamber 4 and is installed coaxially with the outlet pipe 5 and Connected to a device for generating excessive air pressure (not shown), for example, by a fan. Burners 7 are installed tangentially to the plane of the inner surface of the lining in the lower part of the cylindrical body 1 connected by tunnels 8 to combustion chamber 4.

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The outlet of the air supply pipe 6 is located from the inlet of the outlet pipe 5 at a distance I, determined from the ratio

. 0.5 (Pn - dT)

tgf

where Dn is the diameter of the outlet pipe 5;

dr - diameter of the air supply pipe b;

a - opening angle of the air stream exiting the air supply pipe 6.

The diameter of the outlet pipe 5 is determined by the volume of the mixture of combustion products and dilution air leaving the furnace. The diameter of the air supply pipe 6 is determined by the amount of air or other gas supplied to the dilution. The opening angle a of the air stream leaving the air supply pipe 6, proceeding from the laws of opening the flooded free stream, is taken in the range of 26-30 °, which determines the dr communication. Dn and I.

The length of the outlet pipe is determined by the technology requirement for the quality of preparation of the mixture of products of combustion with air and is (2-4) Dn, where Dn is the diameter of the outlet pipe.

The furnace works as follows.

Fuel (gas) is burned in burners 7 installed tangentially in the side wall of the cylindrical furnace body, which provides a vortex (cyclone) combustion method and high quality combustion with a minimum coefficient of excess air. This ensures minimal formation of nitrogen oxides in the combustion products. The products of combustion from the burners 7 through the tunnels 8 enter the combustion chamber 4, about which they move circularly along the wall of the lining around the air supply pipe 6 and the air stream exiting from it. A stream of air in the area between the outlet of the air supply pipe 6 and the inlet of the outlet pipe 5 injects combustion products from the furnace chamber and enters the outlet pipe 5. Under the conditions of stable combustion of gases to prevent burner flame attenuation, the temperature in the furnace should not be lower than 800 ° WITH. According to the technology, the temperature of the gases supplied to the drying unit should be lower, sometimes 2-4 times, than the temperature in the furnace. The gas temperature is reduced

outside the furnace in the outlet pipe 5, which simultaneously performs the function of a mixer,

The proposed cyclone furnace has

The following advantages over the well-known firebox. The energy of the air stream leaving the air supply pipe is used to suck the combustion products in the furnace and to evacuate them from the combustion chamber to

outlet pipe, as well as to overcome the resistance of the outlet pipe. In this case, no additional energy is required for the discharge behind the furnace, which leads to an increase in the efficiency of the drying unit by reducing unorganized air leaks into the drying unit, since the latter will operate under conditions of a lower level of vacuum in the elements of the drying unit. The use of an open jet as an element of the airway will make it possible to proportionally shorten the air supply pipe. This greatly improves the service conditions of the pipe in the working space of the furnace by reducing the cantilever of the pipe, the weight of the insulation on it, and the weight of the pipe itself made of high alloy steel. The design of the assembly for introducing dilution air into the outlet pipe is simplified.

since the air supply pipe does not have a plug and a system of radial openings for air at its end.

Claims (1)

SUMMARY OF THE INVENTION Cyclone furnace containing a chamber combustion with an exhaust pipe installed in the combustion chamber along the axis of the exhaust pipe an air supply pipe and a burner, characterized in that, in order to ensure the possibility of autonomous smoke removal from the furnace by using dilution air energy, a cut of the outlet of the air supply pipe is located from the cut of the inlet of the outlet pipe at a distance of I, determined from the relation ie 0.5 (Dn-dr) "§ where Do is the diameter of the outlet pipe, mm; dT is the diameter of the air supply pipe, mm; “- the angle to open the jet emerging from the air supply pipe.