CN102997240A - Gas burner capable of stabilizing flame propagation - Google Patents

Abstract

The invention discloses a gas burner for stabilizing flame propagation, wherein a burner body comprises a gas input port, a gas spray pipe, a primary damping diffusion cavity and a combustion chamber which are sequentially connected from bottom to top, and the diameter of the gas spray pipe is d₁The diameter of the primary damping diffusion cavity is d₂Combustion chamber diameter d₃The diameter of the flame nozzle is d₄Satisfy d₁＜d₂＜d₃，d₄＜d₃. The vortex baffle plate on the inner side of the flame nozzle at the upper end of the combustion chamber enables an annular cavity body to be formed in the combustion chamber, flame burns in the cavity, the cross section of the combustion chamber is increased relative to the primary damping diffusion cavity, the secondary speed reduction effect is achieved on the gas speed, the high ignition success rate is ensured, the combustion is stable, the gas pressure application range is wide, and the method comprises ultra-low speed atmospheric combustion,The combustion chamber can stably burn in the working modes of low-speed spontaneous combustion, secondary mixed combustion, turbulent flow combustion, high-speed full premixed combustion, oxygen supply type ultrahigh-speed combustion and the like, and has the characteristics of small volume, combustion stability, high ignition success rate, large heat-weight ratio of a combustor and simple structure.

Description

The gas burner that a kind of retention flame is propagated

[technical field]

The present invention relates to burner, the gas burner that especially a kind of retention flame is propagated.

[background technology]

The tradition gas burner generally adopts " flame face " to carry out flame propagation, and usage is described " flame face " spread speed in the combustion gas body to flame propagation velocity U1 usually, also claims burning velocity.Make burning mixture on the engineering, i.e. the mixture of the combustion gas of excess air coefficient α≤1 and air, hereinafter to be referred as: combustion gas.Flow out from the cold conditions pipe, and gas flow rate is U2, when U2≤U1, combustion gas is met with " flame face " and is lighted the formation continuous burning.The shortcoming of this biography fire mode is: it is larger that the speed of burning velocity U1 is affected by environmental factor and excess air coefficient α, when " from flame " fault appears during greater than burning velocity U1 in gas flow rate U2; When " tempering " fault appears during less than burning velocity U1 in gas flow rate U2, the fuel gas buring state is affected than the large-scale combustion poor stability by fire transmission rate.Although secondary burning technology makes α ≈ 5 effectively prevent " tempering " problem by reduction primary air coefficient of excess but burning velocity is low, the burner volume is larger under identical thermic load requires, and namely fires anharmonic ratio; And the burning velocity adjustable range is narrow, and the effective operation interval of burner is little.The present invention namely proposes the gas burner that a kind of retention flame is propagated for this Study on Problems.

[summary of the invention]

The technical problem to be solved in the present invention provides the gas burner that a kind of retention flame is propagated, be characterized in passing the lighter reason by improving, dissolve fire transmission rate and affect the burning velocity problem, realize the self adaptation adjusting of fire transmission rate and burning velocity, guarantee the stability of burning, and have that ignition success rate is high, the combustion gas air pressure scope of application is wide, the burner thermogravimetric is than characteristics large, simple in structure.

For solving the problems of the technologies described above, the gas burner that a kind of retention flame of the present invention is propagated, adopt following technical scheme:

The gas burner that a kind of retention flame of the present invention is propagated, comprise burner body, described burner body comprises from bottom to top the combustion gas input port that connects successively, exhaust gas nozzle, damping diffusion chamber and combustion chamber, described combustion gas input port connects gas supply system, upper end, described combustion chamber is provided with flame jet, and described flame jet inboard is provided with the eddy current catch.

Described burner body is rotary structure.

Described eddy current catch is to be located at the ring belt that flame jet shrinks to the inside.

Described exhaust gas nozzle diameter is d ₁, a described damping diffusion chamber diameter is d ₂, the combustion chamber diameter is d ₃, described flame jet diameter is d ₄, and, satisfy d ₁＜d ₂＜d ₃And d ₄＜d ₃

Described exhaust gas nozzle is used for making the combustion gas body produce higher gas flow rate, exhaust gas nozzle diameter d under the supply pressure effect ₁Size requirements is set, and with when the minimum combustion gas rate of flow of fluid that may occur occurs, tempering phenomenon can not occur in system, and will with exhaust gas nozzle height h ₁Cooperate assurance system tempering-free phenomenon.

The exhaust gas nozzle flow area is long-pending to be S ₁, by formula calculate:

$S=\frac{{\mathrm{\&pi;<figure-callout\; id="2"\; label="d"\; filenames="HDA00002548739300011.png"\; state="\{\{state\}\}">d</figure-callout>}}^2}{4}$

Exhaust gas nozzle height h ₁, purpose is to increase gas channel length, increases area of dissipation, prevents tempering, and isolation combustion chamber and combustion gas input port, prevents that the flame temperature of combustion chamber from exerting an influence h to the combustion gas input port ₁Length is relevant with the minimum jet velocity of air feed, is inversely proportional to jet velocity.

One time the damping diffusion chamber is used for exhaust gas nozzle high velocity air reduction of speed, and its gas total head variation relation meets Bernoulli Jacob's barometric equation:

${\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HDA00002548739300011.png"\; state="\{\{state\}\}">p</figure-callout>}}_1+\frac{p\left({v_1}^2\right)}{2}+{\mathrm{<figure-callout\; id="1"\; label="p\; g\; h"\; filenames="HDA00002548739300011.png"\; state="\{\{state\}\}">p</figure-callout>}}_g{h}_{}{}_1={\mathrm{<figure-callout\; id="2"\; label="p"\; filenames="HDA00002548739300011.png"\; state="\{\{state\}\}">p</figure-callout>}}_2+\frac{p\left({v_2}^2\right)}{2}+{\mathrm{<figure-callout\; id="2"\; label="p\; g\; h"\; filenames="HDA00002548739300011.png"\; state="\{\{state\}\}">p</figure-callout>}}_g{h}_{}{}_2$

Wherein: gas-kinetic pressure is:

Relevant with flow velocity, gas-static is by force p _x, the static pressure that air heat lift forms is p _gH, vertical height is h.

Can be found out by Bernoulli equation, flow velocity eminence pressure is low, and flow velocity lower pressure is high.The combustion chamber does not have in the situation of burning, reduces air velocity and helps igniting; After combustion chamber gas ignited, static pressure P helped to prevent combustion flame pressure backward; Increase combustion gas body preheating time with the continuity of smooth combustion process.

The sectional area of a damping diffusion chamber is S ₂, one time damping diffusion chamber height is h ₂, consider air-flow inertia to the impact of final speed, reduction of speed needs certain distance to be guaranteed, h ₂Proportional with the highest jet velocity of flame.Increase by the gas channel cross section, fuel gas flow speed is once slowed down.

The flame jet of upper end, described combustion chamber, the inboard is provided with the eddy current catch, make the toroidal cavity body that forms in the combustion chamber take smooth combustion as purpose, combustion gas is in the cavity space burning of a suspension, can reduce Inner Wall of Combustion Chamber flame temperature is lost, avoid simultaneously Inner Wall of Combustion Chamber to cross the problem of cause thermal damage.The combustion chamber diameter d ₃With combustion power be proportional relation, and d ₃D ₂, section of combustion chamber is long-pending to be S ₃, the combustion chamber increasing section is long-pending to play the double reduction effect to combustion gas speed, to support ignition success rate.

Before combustion gas was not burnt, gas flow rate was relatively slow in the combustion chamber, and by Bernoulli equation as can be known, externally static pressure rises, and the flame jet diameter that is located at the combustor exit place is d ₄, and d is arranged ₄＜d ₃, this structure makes the combustion chamber form the toroidal cavity body of a semi open model, and the toroidal cavity body thickness is: d ₃-d ₄, toroidal cavity body size during with burning the flame jet velocity relevant, be one with the big or small proportional constant in combustion chamber, the too small meeting of toroidal cavity body thickness makes the fiery eddy current of biography form bad, impact passes fire and causes flame instability, and the toroidal cavity body thickness is excessive, and combustion chamber volume then increases.Needed time of combustion process and pass fiery distance, be subjected to combustion chamber height h ₃Impact.

The combustion chamber does not have in the situation of burning, and relatively low-flow speed helps igniting, and when not burning, airflow volume is determined in each position combustion gas unit interval of burner, has by airflow volume equal principle in the same passage:

v ₁S ₁=v ₂S ₂=v ₃S ₃

Wherein:

v ₁: the gas flow rate of exhaust gas nozzle, (m/s)

v ₂: the gas flow rate of a damping diffusion chamber, (m/s)

v ₃: the gas flow rate of burner, (m/s)

Annotate: above flow velocity gas flow rate in each position when not burning.

So the pass between air velocity and the gas channel sectional area is:

$v_i=v_{i+1}\frac{S_{i+1}}{S_i}$

Wherein: i=1,2 ... n considers d ₁＜d ₂＜d ₃, S is then arranged ₁＜S ₂＜S ₃, v ₁V ₂V ₃

According to Bernoulli equation, ignore difference in height factor h, have with downstream total head formula:

${\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HDA00002548739300011.png"\; state="\{\{state\}\}">p</figure-callout>}}_1+\frac{p\left({v_1}^2\right)}{2}={\mathrm{<figure-callout\; id="2"\; label="p"\; filenames="HDA00002548739300011.png"\; state="\{\{state\}\}">p</figure-callout>}}_2+\frac{p\left({v_2}^2\right)}{2}={\mathrm{<figure-callout\; id="3"\; label="p"\; filenames="HDA00002548739300011.png"\; state="\{\{state\}\}">p</figure-callout>}}_3+\frac{p\left({v_3}^2\right)}{2}$

Consider v ₁V ₂V ₃Have:

$\frac{p\left({v_1}^2\right)}{2}>\frac{p\left({v_2}^2\right)}{2}>\frac{p\left({v_3}^2\right)}{2}$

Dynamic pressure descends along with the increase of gas channel sectional area, and is non-linear relation.

Along with the gas channel sectional area increases the strong variation tendency of its static pressure be:

p ₁<p ₂<p ₃

Wherein:

p ₁: combustion gas static pressure in the exhaust gas nozzle, (Pa)

p ₂: combustion gas static pressure in the damping diffusion chamber, (Pa)

p ₃: combustion gas static pressure in the burner, (Pa)

Annotate: above static pressure combustion gas static pressure in each position when not burning.

When combustion gas was lighted, flame and chamber wall can prevent that by gas barrier flame from directly directly heating sidewall of combustion chamber, reduced flame temperature loss in the combustion chamber, were conducive to the smooth combustion process; Flame is flowed to " flame jet " direction by " One Diffusion Process chamber " during fuel gas buring, form a vortex ring band at the toroidal cavity body, its effect is that the sub-fraction with combustion flame turns back to the flame root, form the flame propagation eddy current and bear the fiery task that passes, pass fiery eddy velocity suitable with the jet flames air velocity, make fire transmission rate carry out adaptive change according to the flame jet velocity, guarantee that burning velocity is carried out fast, and flameholding.

The fuel gas injection pipe produces the high-speed fuel gas body and sprays, provide cooling to prevent the combustion gas tempering, a damping diffusion chamber cuts by gas channel and increases, provide an air velocity to slow down, is provided preheating time for the combustion gas body, guarantee the continuity of smooth combustion process, the combustion gas body enters in the combustion chamber, and burning, by flame jet flame is sprayed, at thickness be: d ₃-d ₄Produce to pass fiery ring of eddy in the toroidal cavity body combustion gas body realized flame propagation, with keep flame continue carry out.The flow velocity that passes fiery eddy current approximates the flame jet velocity, and passing fiery eddy velocity is an automatic control process, and this principle can be guaranteed the continuity of flame.

During air-breathing, the flame temperature rise is the highest can to reach 1700K, presses gaseous state volume equation:

$\frac{V1}{\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="HDA00002548739300011.png"\; state="\{\{state\}\}">T</figure-callout>}1}=\frac{V2}{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="HDA00002548739300011.png"\; state="\{\{state\}\}">T</figure-callout>}2}$

Wherein V is volume, and T is Kelvin, then has:

$V2=\frac{T2}{T1}\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="HDA00002548739300011.png"\; state="\{\{state\}\}">V</figure-callout>}1$

When T1 is normal temperature, during T2=1700K, the volume V1 of the combustion gas body when flue gas volume V2 is than cold conditions during burning is large, approximately 1700 times.Therefore, during fuel gas buring, can produce an extra air pressure p in the combustion chamber ₄, p ₄Be the isotropism relation in the combustion chamber, the total pressure that its pressure size produces during by flame jet for flame, structure have guaranteed maximal rate that flame sprays otherwise combustion process will stop, and this is an automatic control process.

Excess air coefficient α 〉=0.8 in the combustion chamber, flame envelope length reduces along with the increase of excess air coefficient in the combustion process, so has the part turbulent flame in the flame envelope in the normal combustion process.

The gas burner that a kind of retention flame of the present invention is propagated, burner body comprise the combustion gas input port that connects successively, exhaust gas nozzle, damping diffusion chamber and combustion chamber from bottom to top, and described exhaust gas nozzle diameter is d ₁, a described damping diffusion chamber diameter is d ₂, the combustion chamber diameter is d ₃, described flame jet diameter is d ₄, satisfy d ₁＜d ₂＜d ₃, d ₄＜d ₃The eddy current catch of the flame jet inboard of upper end, described combustion chamber, make and form the toroidal cavity body in the combustion chamber, flame is in this chamber internal combustion, the relative damping diffusion chamber increasing section in combustion chamber is long-pending, combustion gas speed is played the double reduction effect, the assurance ignition success rate is high, flameholding, and the combustion gas air pressure scope of application is wide, the atmospheric burning type that comprises Ultra-Low Speed, the Ben Shengshi burning of low speed, secondary mixed combustion, the turbulence type burning, can both smooth combustion under the mode of operations such as full premix combustion at a high speed and the burning of oxygen-supplying type ultrahigh speed, have volume little, the stability of burning, and have ignition success rate high, the burner thermogravimetric is than large, characteristics simple in structure.

[description of drawings]

Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail, wherein:

Fig. 1 is structural representation of the present invention.

Fig. 2 is size marking schematic diagram of the present invention.

[specific embodiment]

Below in conjunction with accompanying drawing embodiments of the present invention are elaborated.

The gas burner that a kind of retention flame of the present invention is propagated, comprise burner body 1, be that burner body 1 comprises from bottom to top the combustion gas input port 2 that connects successively, exhaust gas nozzle 3, damping diffusion chamber 4 and combustion chamber 5, the lower end of described combustion gas input port 2 connects gas supply system, 5 upper ends, described combustion chamber are provided with flame jet 6, and described flame jet 6 inboards are provided with eddy current catch 7.Described exhaust gas nozzle 3 diameters are d ₁, described damping diffusion chamber 4 diameters are d ₂, combustion chamber 5 diameters are d ₃, described flame jet 6 diameters are d ₄, and satisfy d ₁＜d ₂＜d ₃, d ₄＜d ₃

The flame jet 6 inboard eddy current catch 7 that arrange of 5 upper ends, described combustion chamber, make combustion chamber 5 interior formation toroidal cavity bodies, flame is in this chamber internal combustion, combustion chamber 5 relative damping diffusion chamber 4 increasing sections are long-pending, combustion gas speed is played the double reduction effect, can improve ignition success rate and guarantee combustion stability.

Before the burner ignition, combustion mixture at first enters into combustion gas input port 2, because there is draught head in combustion gas input port 2 with flame jet 6, combustion mixture is toward flame jet 6 direction jet motion, when combustion gas flows into a damping diffusion chamber 4 through exhaust gas nozzle 3, the jet velocity that increases combustion mixture because of aisle spare is once slowed down, combustion mixture enters into combustion chamber 5 thereupon again, because of damping diffusion chamber 4 aisle spares of combustion chamber 5 area ratio of combustion chamber passage large, the jet velocity of combustion mixture is slowed down again, be secondary speed-reducing, low gas flow guarantees the success rate of igniting.

After the burner ignition, combustion mixture in the combustion chamber 5 forms flame by burning, its volume expands rapidly, this process is one of 5 interior formation and former air supply system pressure gas pressure P4 independently mutually in the combustion chamber, the direction of P4 presents the isotropism relation in combustion chamber 5, its size is directly proportional from flame jet 6 jet velocities by flame, combustion mixture pressure P 3 opposite directions in P4 and the damping diffusion chamber 4, this is a self-regulating process but P4≤P3 is always arranged, when if P3≤P4 occurs, namely there is air demand to reduce, combustion intensity descends, and flame jet 6 jet velocities descend, and P4 descends, to guarantee P4≤P3, the automatic adjusting relation of this smooth combustion.

Combustion chamber 5 forms a toroidal cavity body with eddy current catch 7, and combustion chamber 5 internal combustion flames are forming annular high-temperature flue gas vortex strip in the toroidal cavity body under the effect of eddy current catch 7, and the eddy current direction is parallel with flame, and eddy velocity approximates flame speed.Its effect is that the sub-fraction with combustion flame turns back to the flame root, form and pass fiery eddy current, bear the fiery task that passes, structurally guaranteed to pass fiery eddy velocity suitable with the jet flames air velocity, make fire transmission rate carry out adaptive change according to the flame jet velocity, guarantee that burning velocity is carried out fast, and flameholding.

Claims (4)

1. the gas burner propagated of the retention flame, comprise burner body (1), it is characterized in that burner body (1) comprises from bottom to top the combustion gas input port (2) that connects successively, exhaust gas nozzle (3), a damping diffusion chamber (4) and combustion chamber (5), the lower end of described combustion gas input port (2) connects gas supply system, upper end, described combustion chamber (5) is provided with flame jet (6), and described flame jet (6) is provided with eddy current catch (7).

2. the gas burner of propagating by the described a kind of retention flame of claim 1 is characterized in that described burner body (1) is rotary structure.

3. the gas burner of propagating by the described a kind of retention flame of claim 1 is characterized in that described eddy current catch (7) is for being located at the ring belt that flame jet (6) shrinks to the inside.

4. the gas burner of propagating by the described a kind of retention flame of claim 2 is characterized in that described exhaust gas nozzle (3) diameter is d ₁, a described damping diffusion chamber (4) diameter is d ₂, combustion chamber (5) diameter is d ₃, described flame jet (6) diameter is d ₄, satisfy d ₁＜d ₂＜d ₃, d ₄＜d ₃

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