Block injection burner

 

(57) Abstract:

The invention relates to the design block injection burners for equipment of gas-fired furnaces hot water and steam boilers, which are used primarily in heating systems of residential, public and industrial buildings. The objective of the invention is to reduce the concentration of nitrogen oxides in the combustion of gaseous fuel. The burner is the case, the air-distributing chamber in the lower part of the body, the pressure of the gas collector, laid over the air-distributing chamber, refractory masonry separating the housing into the mixing zone and a combustion zone and having in the upper part of the slit extending the length of the gas manifold and the tubular injector mixers, rigidly fixed to the walls of the gas manifold and the refractory lining, open each with the bottom side in the air-distributing chamber, with the high slit in the refractory lining and through the holes in the pipe walls in the cavity gas reservoir. In the refractory lining parallel to the injector mixers provided with channels connecting the combustion zone from the air-distributing chamber, and the sum of the flow areas of these facilities is gaining refers to the construction of block injection burners (BIH) for equipment of gas-fired furnaces hot water and steam boilers, which is used mainly in heating systems of residential, public and industrial buildings.

Known burner having a mixer-injector with a Central nozzle connected to a source of natural gas and freely communicated with the opposite nozzle side with the atmosphere, nose and lined with refractories tunnel [1].

Outdoor suction air in a burner creates intense (above the level allowed by the rules of sanitation) aerodynamic noise, and because of the single mixing occurs, the possibility of incomplete combustion of gas in a powerful torch. Therefore, for heating hot water boilers more acceptable block injection burners.

Known burner, comprising a housing, an air chamber in the lower part of the body, the pressure of the gas collector, laid over the air-distributing chamber, refractory masonry separating the housing into the mixing zone and a combustion zone and having in the upper part of the slit extending the length of the gas manifold, tubular injector mixers, rigidly fixed to the bottom and top parts of the gas reservoir and the refractory lining, communicating through the open ends of bottom - air-ora [2].

Distributed on many points of the leak in the injector mixers through the buffer air chamber and the mixing gaseous fuel with air inside with not only heat, but also sound-insulating properties of the refractory masonry in combination with a predominantly bottom placement of BIH significantly reduce wind noise.

However, the amount of nitrogen oxides (NOx) generated in the flame of such burners, up to 500 mg/m3and more combustion products.

The objective of the invention is to reduce the concentration of nitrogen oxides in the combustion products through the redistribution of air supplied for combustion of the fuel gas.

This object is achieved in that block injection burner body, the air-distributing chamber in the lower part of the body, the pressure of the gas collector, laid over the air-distributing chamber, refractory masonry separating the housing into the mixing zone and a combustion zone and having in the upper part of the slit extending the length of the gas manifold and the tubular injector mixers, rigidly fixed to the walls of the gas manifold and the refractory lining, open each with a bottom that is UB - in the cavity gas manifold according to the invention, has in the refractory lining parallel to the injector-mixer channels connecting the combustion zone from the air-distributing chamber, and the sum of the flow areas of these additional channels is 20...60% of the total area of all vozduhonosnykh channels.

In Fig.1 shows the proposed BIG cross section of Fig.2 is a longitudinal section; Fig.3 - the same, top view.

The proposed BIH has a housing 1 with the air-distributing chamber 2 in its lower part; a pressurized gas reservoir 3 in the form of a box with an inlet pipe 4, is laid over the air distribution chamber 2; the refractory brickwork 5, which divide the housing 1 at a mixing zone and a combustion zone and has a slit 6, the length of which corresponds to the length of the discharge gas manifold 3; tubular injector mixers 7, which is rigidly fixed in the upper (ceiling) and lower (bottom) the walls of the subsurface pressure gas reservoir 3 and using gaskets 8 of the refractory mass in the refractory lining 5 and which are communicated with the cavity of the air distribution chamber 2 through the open bottom ends, with the cavity pressure gas reservoir 3 through tilted on the additional channels 9 in the refractory lining 5, parallel to the injector mixers 7 and connecting the cavity of the air-distributing chamber 2 with the combustion zone. These channels have a cross-section equal to 20...60% of the total area of all air-conducting channels. They can be made in the form of rows of parallel among themselves holes, and (mostly) in the form of cracks. In the lower input of the additional air-conducting channels 9 can be installed dampers 10 for the current regulation of the air flow in the bypass injector-mixer 7. At the entrance to the air distribution chamber 2 may also be set by the gate 11.

Depending on the need for specific heating boilers of thermal power BIG can have multiple rows of the described elements.

BIG works as follows.

Flammable gas under pressure is fed through the pipe 4 into the cavity gas manifold 3. Passing through the holes in the walls of the injector-mixer 7, the gas injects the primary air from the air distribution chamber 2 and is mixed with it. A combustible mixture enters into the slit 6, which is formed long torch.

With both sides to flare mixed with the secondary air entering the combustion zone across the x-sections of the channels 9 does not extend beyond 20...60% of the total area of all air-conducting channels, the concentration of nitrogen oxides in the combustion products does not exceed 170 mg/m3.

This positive effect was established in the experiments with the proposed BIG on hot water boiler model CWS-1.86 G plant Kasenanankana". In the hearth of the furnace of the boiler had been installed two BIG, each of which had 13 of the injector-mixer in the form of segments of pipe length 290 mm with an outer diameter of 49 mm and a wall thickness of 3 mm In the walls of each tube in the zone corresponding to the lumen of the pressurized gas reservoir, at an angle of 25aboutin the upward direction were performed on four asymmetrically (after 90aboutlocated holes with a diameter of 1.5 mm each.

Injectors-mixers were recorded in the upper and lower walls of the subsurface pressure gas manifold by welding, and in refractory brickwork - refractory same mass, containing 45% chromium ore powder and sintered magnesia and 10% refractory clay.

The lower ends of the injector mixers were equipped located in the air distribution chamber dampers to regulate the flow of primary air within 100...65% (and, accordingly, the secondary air is in the range 0...35%) of the total air flow rate on positely were made in the form of a slit width of 10 mm and is equipped with dampers to control the flow of secondary air. When fully open the gates the sum of the flow areas of the slits 66% of the total area of cross sections of all vozduhonosnykh channels.

Natural gas fed into the gas manifold at a pressure of 0.7. . . 0,8 MPa (0,17 0,18...MPa), and the air admitted to the air chamber directly from the atmosphere.

The concentration of nitrogen oxides in the combustion products was determined using the universal gas analyzer model UG-2 by the method of gas Institute of the Academy of Sciences of the USSR (see "Chemical technology", 1975, No. 2, S. 47...50), and in the control samples - photocolorimetric using reagent Grisse-Ilosvay.

The experiments were carried out with step change in the share of area additional channels in the total area of all vozduhonosnykh channels in the interval: 0, 15, 20, 35, 45, 50, 56, 60, 63 and 66%.

The results of the experiments presented in the table.

As can be seen from the table, the proposed BIG in comparison with the prototype has the following advantages:

in technical terms is provided by the formation of a torch with a more uniform temperature field, which complicates the course of chemical reactions thermal oxidation of nitrogen;

ecological respect to the economic the proposed BIH is able to prevent damage to the environment.

BLOCK INJECTION BURNER body, the air-distributing chamber in the lower part of the body, the pressure of the gas collector, laid over the air-distributing chamber, refractory masonry separating the housing into the mixing zone and a combustion zone and having in the upper part of the slit extending the length of the gas manifold and the tubular injector mixers, rigidly fixed to the walls of the gas manifold and the refractory lining, open each with the bottom side in the air-distributing chamber, with the upper end in the slot in the refractory lining and through the holes in the pipe walls in the cavity pressure gas reservoir, characterized in that in the refractory lining parallel to the injector mixers made channels, additional connecting the combustion zone from the air-distributing chamber, the sum of the flow areas of these additional channels is 20 to 60% of the amount of longitudinal cross-sections of all vozduhonosnykh channels.

 

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