CN1144897A - Variable section Rieke type acoustic vibration burner - Google Patents

Abstract

A cross section variable sound-oscillating burner comprises top and bottom closing-in segments, burning chamber and combustion bed. Said closing-in segments is made up of one or more straight pipe with diameter not equal to that of burning chamber. Said combustion bed is arranged at air inlet of burner. Its advantages include reasonable structure, low length/diameter ratio, adjustable sound oscillating frequency, high combustion and heat efficiency and less environmental pollution.

Description

Variable section Rieke type acoustic vibration burner

The invention belongs to burner, especially variable section Rieke type acoustic vibration burner is applicable to the occasion that industrial high-efficiency low-pollution sound shakes and burns.

Before the present invention made, the Rieke type burner of prior art was a gram pipe phenomenon in utilizing, lining gram pipe phenomenon be in the physical phenomenon of the heat sound conversion found of gram.Since this century the eighties, people utilize this phenomenon, make fuel when the internal combustion of combustion chamber, are in the sound field of self-oscillatory air stream, and so-called " sound shake burning " promptly takes place.Fact proved that sound shakes to burn and not only can increase substantially the efficiency of combustion of fuel, therefore also can reduce pollution, and can obviously improve heat transfer efficiency, thereby become a kind of quite promising brand-new burner.For being used for various boilers and heater, now invented the Rieke type burner, it mainly is made up of the uiform section combustion chamber and the burning bed of both ends open, the burner lower end

The place is provided with burning bed, and its major defect is: (1) burner draw ratio is generally 10, causes bigger burner, and length is long, and the burning bed position is too high, and this structure is difficult in industrial being applied; (2) the sound vibration frequency depends on burner length basically, therefore for the large scale industry boiler, when its required sound vibration frequency is higher, just can't realize; (3) for different demanded fuel sound vibration frequencies not simultaneously, be difficult to satisfy; (4) for the adjacent member intrinsic frequency with it near the time, very easy generation damages and is difficult to solve.

Task of the present invention is to overcome the deficiencies in the prior art, provide a kind of rational in infrastructure, reduce the burner draw ratio, the sound vibration frequency needs and the adjacent member variable section Rieke type acoustic vibration burner that requirement can be adjusted for antivibration, security is good by different fuel.

Variable section Rieke type acoustic vibration burner, mainly by the section (1) that closes up down, last closing in section (3), and combustion chamber (2) and burning bed (4) composition, outlet side, combustion chamber (2) links to each other with the section (1) that closes up down with last closing in section (3) respectively with inlet end, following closing in section (1) and last closing in section (3) can be made up of the straight tube more than 1 or 1 respectively, the total sectional area of the following section (1) that closes up and the total sectional area of last closing in section (3) are 0.2～0.8 with the ratio of combustion chamber (2) sectional area respectively, the length of the following section (1) that closes up is 0～0.2 with the ratio of burner length overall, the length of the last section (3) that closes up is 0～0.5 with the ratio of burner length overall, the ratio of the equivalent diameter of this burner length overall and combustion chamber (2) is 3.5～6.0, burning bed (4) is arranged on the combustor air inlet end, the burner length overall ～ The place.

Fig. 1 is the variable section Rieke type acoustic vibration burner structural representation.

The section that wherein 1-down closes up, 2-combustion chamber, 3-go up the section that closes up, 4-burning bed.

Fig. 1 is one embodiment of the present of invention.As shown in Figure 1, operation principle of the present invention and embodiment are: variable section Rieke type acoustic vibration burner, mainly by the section (1) that closes up down, last closing in section (3) and combustion chamber (2), burning bed (4) is formed, the outlet side of combustion chamber (2) links to each other with the section (1) that closes up down with last closing in section (3) respectively with inlet end, following closing in section (1) and last closing in section (3) are made up of 1 and 1 above straight tube respectively, the following total sectional area of section (1) and the total sectional area of last closing in section (3) and the ratio of combustion chamber (2) sectional area of closing up is 0.2～0.8, the length of the following section (1) that closes up is 0～0.2 with the ratio of burner length overall, the length of the last section (3) that closes up is 0～0.5 with the ratio of burner length overall, the ratio of the equivalent diameter of this burner length overall and combustion chamber (2) is 3.5～6.0, burning bed (4) is arranged on the combustor air inlet end, the burner length overall

～ The place.With the coal-burning boiler burner is example, following closing in section (1) and last closing in section (3) are made of 1 and 9 straight tubes respectively, following closing in section (1) links to each other with last muffler with bottom silencer respectively with last closing in section (3), chimney links to each other with last muffler, combustion chamber (2), the outer water jacket of last closing in section (3) arranged outside, burning bed (4) is made up of fire bars and stainless steel cloth, when combustion chamber (2) diameter to coal-burning boiler is that 1 meter burner is when designing, the ratio of the equivalent diameter of its burner length overall and combustion chamber (2) only is 4.0, when required vibration frequency f=28HZ, the total sectional area of following closing in section (1) and the ratio of combustion chamber (2) sectional area are 0.20, the total sectional area of last closing in section (3) and the ratio of combustion chamber (2) sectional area also are 0.20, the length of the following section (1) that closes up is 0.125 with the ratio of burner length overall, the length of the last section (3) that closes up is 0.35 with the ratio of burner length overall, burning bed (4) is arranged on the combustor air inlet end, the burner length overall

The place, the present invention is reasonable in design, can be in industrial extensive employing.As Rieke type burner design by prior art, be 10 meters not only because of the burner length overall needs the burner length overall with the combustion chamber equivalent diameter than 〉=10, and this moment, the burning bed height is 2.9 meters, such burner is in industrial very difficult employing, or even unpractical.Last closing in section (3) adopts multitube can increase heat exchange area, and following closing in section (1) adopts multitube can promote that air inlet is even.Bottom silencer is made of one with the section that closes up down can be reduced in size.After following closing in section (1) and last closing in section are provided with bottom silencer and last muffler respectively noise is controlled at about 60DB, be significantly less than the requirement of national environmental protection, the present invention can make the burner of industrial pluralities of fuel improve efficiency of combustion, the thermal efficiency also reduces the pollution of smoke evacuation to environment, for example in coal-burning boiler, by vibration air stream and coal-fired relative motion in the burner, coal is fully burnt, and (just make the efficiency of combustion of undressed lump coal under the α=1.05-1.10) up to more than 95% at low air coefficient of excess, sound in the burner shakes and has not only improved the burning of coal environment, heat loss due to unburned gas is reduced to below 1% by the 1-3% of routine, and because the speed coupling effect has been accelerated the combustion speed of coal greatly, the time that the coal grain tail-off time stops in the combustion zone less than it, make heat loss due to combustibles in refuse Q4 have only 0～5%, and the present non-coal-powder boiler of China is about 5～15%.Convection transfer rate can strengthen 100-300% when laminar flow because sound shakes down, when turbulent flow, also can strengthen 20～30%, so just can absorb more heat under identical heating surface area before high-temperature fuel gas is discharged, simultaneously required coefficient of excess air is low, so can further reduce heat loss due to exhaust gas Q ₂, therefore, the thermal efficiency of boiler can improve 5-10%, and owing to burning is complete, oke exhaust blackness can reach below 0.5 grade, does not contain uncombusted coal grain in the smoke evacuation substantially, and flying dust is also few, lacks half, NO when the comparable non-sound of the content of CO shakes burning in the smoke evacuation _xContent also can reduce about half.Adopt when of the present invention, need not F.D, when vertical the placement even can not air blast, thereby have reduced additional source of energy, for energy savings and the environmental pollution that improves China provide a valid approach.

The present invention compared with prior art, and is rational in infrastructure feasible, can reduce the burner major diameter Ratio, the sound vibration frequency can need and adjacent member wanting for the antivibration proposition by different fuel Ask and adjust, efficiency of combustion and thermal efficiency height, environmental pollution is little, and is safe and reliable, tool Bigger implementary value and economic results in society are arranged.

Claims (1)

1, variable section Rieke type acoustic vibration burner, include combustion chamber (2) and burning bed (4), it is held and levies is mainly to be made up of the section (1) that closes up down, upward closing in section (3), the inlet end of combustion chamber (2) links to each other with the section (1) that closes up down with last closing in section (3) respectively with the outlet side, and following closing in section (1) and last closing in section (3) can be made up of the straight tube more than 1 or 1 respectively.The total sectional area of the following section (1) that closes up and the total sectional area of last closing in section (3) are 0.2～0.8 with the ratio of combustion chamber (2) sectional area respectively, the length of the following section (1) that closes up is 0～0.2 with the ratio of burner length overall, the length of the last section (3) that closes up and the ratio of burner length overall are that the ratio of the equivalent diameter of this burner length overall of 0～0.5. and combustion chamber (2) is 3.5～6.0, burning bed (4) is arranged on the combustor air inlet end, the burner length overall

～ The place.

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