CN201521962U

CN201521962U - Heat storage high-velocity burner

Info

Publication number: CN201521962U
Application number: CN2009201287037U
Authority: CN
Inventors: 顾向涛
Original assignee: 顾向涛
Current assignee: Chongqing Aokeqi Technology Co., Ltd.
Priority date: 2009-09-01
Filing date: 2009-09-01
Publication date: 2010-07-07
Anticipated expiration: 2019-09-01

Abstract

The utility model discloses a heat storage high-velocity burner. The heat storage high-velocity burner comprises a burner body, in which an air or smoke passage, a porous heat storage body, a burning cavity, a fuel gas pipeline and an ignition device are arranged, and is characterized in that the cross-section area of the inner cavity for the fuel gas to pass through in the fuel gas pipeline is variable, and the flow velocity of the fuel gas in the inner cavity can be controlled by changing the cross-section area of the inner cavity; a necking-shape fuel gas nozzle is arranged at the tail end of the fuel gas pipeline, and the cross-section area of the fuel gas nozzle is smaller than that of the inner cavity. The heat storage high velocity burner provided by the utility model is high in resource utilization rate, can ensure the uniformity of furnace temperature, can prevent various pipelines at the periphery of the cavity from being burned, and effectively prolongs the service life thereof; moreover, the fuel gas is sprayed through the necking-shape nozzle according to the furnace temperature to be burned at a higher velocity, thereby effectively controlling the flame temperature, which is favorable for the sufficient burning of the fuel gas and greatly reduces the discharge amount of NOX.

Description

The heat accumulating type high combustion rate burner

Technical field

The utility model relates to a kind of high, medium and low temperature industrial fuel-fired furnace burner, the heat accumulating type high combustion rate burner of especially high, medium and low temperature industrial fuel-fired furnace.

Background technology

Regenerative combustion technology is the present best energy-saving combustion technology of energy-saving effect in the world, its principle is to adopt the paired burner that has heat storage to carry out the burning of control formula, when a burner combustion, another burner carries out air-breathing smoke evacuation, high-temperature flue gas during by heat storage and heat storage carry out thermal energy exchange, heat storage heat absorption, high-temperature flue-gas reduce; Through certain hour, after the heat storage accumulation of heat is saturated, commutate, during another burner combustion, cold air or fuel enter burner from the higher heat storage of endothermic temperature, heated by this heat storage; Simultaneously, the burner of former burning carries out air-breathing smoke evacuation, and high-temperature flue gas with the heating of its heat storage, carries out heat exchange again, by the continuous alternate combustion repeatedly of two burners, reaches energy-conservation effect.The name that applicant was applied on March 8th, 2006 is called " heat accumulating type impulse burner ", the patent No. is the disclosed technology contents of utility model patent of ZL200620110073.7, is exactly a kind of heat storage type combustion burner.Burner of the prior art, structure respectively have difference, and its common ground is that combustion air air inlet pipe and fuel air pipe mix the disposable burning in back in burner, cause the flame combustion temperature higher, for high heating value gas, flame temperature can reach more than 2000 ℃, because flame temperature and NO _XThe growing amount exponent function relation, conventional heat storage type combustion is facilitated NO greatly _XGeneration.NO _XAs burnt gas, can damage the ozone layer, cause acid rain and human body is produced strong impulse, facilitate PUD D etc., bigger environmental pollution is arranged, be to need strict control.

At present, the dispersed combustion mode that metallurgy industry is commonly used is though can reduce NO _XDischarge capacity still, is not suitable for cycle stove, particularly low temperature and moderate oven.Dispersed combustion causes low-temperature burning efficient low, and flame momentum and underspeed can't satisfy the high temperature-controlled precision of cycle stove, the inhomogeneity requirement of high furnace temperature.

In addition, in aforesaid heat-accumulating burner,, burn out naked light parts such as pipeline on every side easily, cause shorten its service life because flame temperature can reach more than 2000 ℃; Especially metallic conduit can not use with regard to burning out in use for some time.And if adopt resistant to elevated temperatures earthenware duct, though improved resistance to elevated temperatures, embrittlement under repeatedly the effect of colding and heat succeed each other, takes place and damages in the heat storage type combustion process in earthenware duct easily, its service life is still not long.

The utility model content

The utility model provides a kind of and reduces NO in the combustion product by nonflame or conflagration mode at the above deficiency of the burner of prior art _XContent, prolong the burner heat accumulating type high combustion rate burner in service life.

The technical solution of the utility model: the heat accumulating type high combustion rate burner, comprise burner body, in burner body, be provided with air or exhaust gases passes, cellular heat storage, combustion cavity, gas pipeline and igniter; It is characterized in that: the cross-sectional area of the inner chamber that passes through for combustion gas in the described gas pipeline changes, by changing the cross-sectional area of inner chamber, with the flowing velocity of control combustion gas in inner chamber.

Further feature is: at the end of gas pipeline the combustion gas spout of reducing shape is set, the cross-sectional area of combustion gas spout is less than the cross-sectional area of inner chamber.

The end of combustion cavity is a flame jet, and the sectional area of flame jet dwindles gradually.

At the end of gas pipeline, the flame protective cover is set, the spout of flame protective cover end is the reducing shape, the cross-sectional area of spout dwindles gradually.

The center line of the center line of combustion gas spout, the center line of spout and flame jet coincides.

A high-speed fuel gas pipeline is set outside combustion cavity, and the high-speed fuel gas pipeline directly feeds burner hearth, and the end of high-speed fuel gas pipeline is provided with the spout of reducing shape.

Flameless combustion is to carry out combustion and segmented, and cycle stove heating process is from low temperature to high temperature.When furnace temperature is not high, air themperature through the heat storage heating is not high, low temperature combustion mode commonly used burns, burning occurs in the low-temperature burning cavity of burner, the outlet of cavity designs for reducing, and burning produces high-temperature gas, is the high velocity jet mode through the combustion cavity shrinkage cavity, high speed and high temperature gas flow strong agitation furnace gas, temperature uniformity is good.Because when furnace temperature was low, air preheating temperature was not high, burning back flame temperature is not high, and low temperature combustion mode commonly used can guarantee efficiency of combustion, can guarantee temperature uniformity again, also guarantees NO simultaneously _XDischarge capacity is lower than national requirements for environmental protection.

When furnace temperature raises, the air preheating temperature height is after uniform temperature, by low-temperature burning control valve and flameless combustion control valve combustion system is switched to the flameless combustion mode from low temperature combustion mode, it is very high that the flameless combustion state is that combustion gas sprays into speed, in the low-temperature burning cavity, fuel also has little time burning, after high-temperature gas through preheating mixes, through the cavity reducing, spray into cavity at a high speed, under the drive of spray speed, mix rapidly with furnace gas, behind the furnace gas and fuel mix that oxygen content is very low, greatly reduce the oxygen content of combustion mixture, cause burning under low-oxygen environment, to carry out, the reduction of oxygen content, reduced flame temperature widely, evidence, under given conditions, burning this moment is flameless combustion, do not observe flame at all, thereby reduced NO _XDischarge capacity.Because the ejection kinetic energy after the injection power of combustion gas and the gas after the air preheat expand is very high, flameless combustion can be satisfied the requirement of temperature uniformity and temperature-controlled precision equally.

From the above, heat accumulating type high combustion rate burner of the present utility model has the advantage of heat accumulating burner capable good energy-conserving effect, the efficiency of energy utilization height; When guaranteeing temperature uniformity, can also reduce NO significantly _XDischarge capacity meets the trend and the requirement of environmental protection; Can protect simultaneously cavity various pipelines on every side not by scaling loss again, effectively prolong its service life; Fuel sprays into by necking spray orifice according to furnace temperature, burns under fair speed, effectively controls flame temperature, helps the abundant burning of fuel.

Description of drawings

Fig. 1 is first kind of example structure schematic diagram of the utility model;

Fig. 2 is second kind of example structure schematic diagram of the utility model;

Fig. 3 is the third example structure schematic diagram of the utility model.

The specific embodiment

In Fig. 1, heat accumulating type high combustion rate burner of the present utility model, comprise burner body 1, in burner body 1, be provided with air or exhaust gases passes 2, cellular heat storage 3, combustion cavity 4, gas pipeline 5 and igniter 6 etc., the passage that air or exhaust gases passes 2 enter as the combustion air in when burning, or, air is imported in the burner body 1 (in combustion cavity 4 and combustion gas mixing burning) maybe will burn outside the flue gas discharge burner body 1 that produces to the exhaust gases passes of discharged gas fume; By the cellular heat storage 3 that refractory material (as refractory ceramics class material) is made, the said minuscule hole that inside has many supplied gas to pass through when gas passes through, can be carried out exchange heat with gas; As what pass through is high-temperature flue gas, and 3 heats that absorb high-temperature flue gas of cellular heat storage raise himself temperature, and thermal energy storage is got up; When the combustion air of lower temperature by the time, then cellular heat storage 3 heat releases reduce himself temperature again when adding hot-air, with thermal energy transfer to combustion air.Combustion cavity 4 is zones of combustion gas and combustion air mixed combustion, produces thermal-flame; Gas pipeline 5 is input to the combustion gas in the external world in the burner body 1; The combustion gas that igniter 6 can in time will spray in the combustion cavity 4 is as required lighted, and prevents a large amount of gathering of combustion gas and the initiation security incident.Above as prior art, be not further described at this.

Improvement of the present utility model, the cross-sectional area of the inner chamber 51 that passes through for combustion gas in the gas pipeline 5 is transformable, according to the burning needs under the condition of different temperatures, by changing the cross-sectional area of inner chamber 51, with the flowing velocity of control combustion gas in inner chamber 51; A kind of cross-sectional area structure that changes inner chamber 51, it is the combustion gas spout 52 that the reducing shape is set at the end of gas pipeline 5, the cross-sectional area of combustion gas spout 52 is less than the cross-sectional area of inner chamber 51, the combustion gas that have certain flowing velocity, after control valve control, enters gas pipeline 5 from the outside, when passing through the combustion gas spout 52 of gas pipeline 5 ends, because of reducing effect pick up speed, enter fast in the combustion cavity 4, or enter in the burner hearth by combustion cavity 4 fast.Another kind of structure (not illustrating among the figure) is on gas pipeline 5 control valve to be set, and open and close by control valve and the pore size of opening satisfy the burning needs under the condition of different temperatures to change the cross-sectional area of inner chamber 51.Control valve is the valve of existing automatically controlled, pneumatic or hydraulic control, can change the cross-sectional area of the inner chamber 51 of gas pipeline 5.

The end of combustion cavity 4 is flame jets 41, and the sectional area of flame jet 41 dwindles gradually, is the reducing shape, can improve flame or combustion gas are ejected into burner hearth from flame jet 41 speed; Flame jet 41 among the figure is coniform reducings.Under the low-temperature burning state, flame enters burner hearth with higher speed through flame jet 41; Under the flameless combustion state, combustion gas is through the flame jet 41 of reducing shape, spray into burner hearth at a high speed, under the drive of spray speed, mix rapidly with furnace gas, behind the furnace gas and combustion gas mixing that oxygen content is very low, greatly reduce the oxygen content of burning mixture, cause burning under low-oxygen environment, to carry out, the reduction of oxygen content, reduce flame temperature widely, thereby reduced NO _XDischarge capacity.

In order to prevent that flame from being blown out by cold air, at the end of gas pipeline 5, flame protective cover 7 is set, flame protective cover 7 interior, stops combustion air directly to blow to flame the protection of combustion gas spout, with the retention flame, prevent fray-out of flame, avoids security incident.In addition; the spout 71 of flame protective cover 7 ends is reducing shapes, and the cross-sectional area of spout 71 dwindles gradually, helps improving the jet velocity of flame or gas; it is entered in the combustion cavity 4 from the spout 71 of reducing shape at a high speed, help the abundant burning of combustion gas under low temperature or the flameless combustion state.

At the burning initial stage; flame and fire box temperature are all lower; in order to obtain stable flame at the burning initial stage; the utility model is offered conduction hole 72 on flame protective cover 7; the opening of conduction hole 72 is less, will be incorporated in the flame protective cover 7 from a small amount of combustion air that air or exhaust gases passes 2 enter, and can prevent that again combustion air is with flame blow-off simultaneously; make it under burning initial stage low-temperature condition, in flame protective cover 7, have stable flame.

The center line of the center line of the combustion gas spout 52 of gas pipeline 5, the center line of spout 71 and flame jet 41 coincides, can guarantee that combustion gas or flame enter in the burner hearth with the shortest distance, reduce its flow resistance, help the abundant burning of combustion gas under low temperature or the flameless combustion state.

For situation about effectively grasping and control is burnt, flame detector 8 is set, the end of flame detector 8 is arranged on around the combustion gas spout 52 that can detect the flame combustion situation, so that detect and whether in time to be lighted, to burn whether stable etc. from the combustion gas of combustion gas spout 52 ejections, guarantee normal, the safe combustion of burner.

As shown in Figure 2, in second kind of example structure of the utility model, no longer introduce with the structure same section among Fig. 1.The further improvement of second kind of example structure of the utility model is: flame protective cover 7 is arranged on a side (left side among the figure) of air or exhaust gases passes 2 center lines; flame protective cover 7 is arranged on the left side; sizes etc. are dwindled; help increasing the bulk of combustion cavity 4, it is more even to make that combustion gas mixes with air.

As shown in Figure 3, in the third example structure of the utility model, no longer introduce with the structure same section among Fig. 1 or Fig. 2.The further improvement of the third example structure of the utility model is: a high-speed fuel gas pipeline 9 is set outside combustion cavity 4 in addition, the terminal burner hearth (not illustrating among the figure) that directly feeds of the high-speed fuel gas pipeline 9 that is connected with the fuel gas transportation pipeline in the external world, the end of high-speed fuel gas pipeline 9 is provided with the spout 91 of reducing shape; The combustion gas of present embodiment enters pipeline two, and one is the gas pipeline 5 that feeds combustion cavity 4, and another root is the high-speed fuel gas pipeline 9 that feeds burner hearth; In the needs high-velocity combustion stage, under the control device control action, enter the combustion gas of high-speed fuel gas pipeline 9, when passing through the combustion gas spout 91 of high-speed fuel gas pipeline 9 ends, because of reducing effect pick up speed, enter in the burner hearth fast, produce the flameless combustion effect, have from stirring action, mix, improve the burner hearth temperature uniformity with inner of the boiler chamber gas.The high-speed fuel gas pipeline 9 of this kind structure is arranged on around the burner hearth more easily, and combustion gas can be sprayed in the burner hearth with more rational orientation and angle, and combustion gas and furnace gas mix, and more help the burning in flameless combustion stage.

Claims

1. the heat accumulating type high combustion rate burner comprises burner body (1), is provided with air or exhaust gases passes (2), cellular heat storage (3), combustion cavity (4), gas pipeline (5) and igniter (6) in burner body (1); It is characterized in that: the cross-sectional area of the inner chamber (51) that passes through for combustion gas in the described gas pipeline (5) is transformable; At the cross-sectional area of the terminal combustion gas spout (52) that is provided with of gas pipeline (5) cross-sectional area less than inner chamber (51).

2. heat accumulating type high combustion rate burner according to claim 1 is characterized in that: the end of combustion cavity (4) is flame jet (41), and the sectional area of flame jet (41) dwindles gradually.

3. heat accumulating type high combustion rate burner according to claim 2 is characterized in that: the end in gas pipeline (5), flame protective cover (7) is set, and the terminal spout (71) of flame protective cover (7) is the reducing shape, the cross-sectional area of spout (71) dwindles gradually.

4. heat accumulating type high combustion rate burner according to claim 3 is characterized in that: the center line of the center line of combustion gas spout (52), spout (71) and the center line of flame jet (41) coincide.

5. heat accumulating type high combustion rate burner according to claim 3 is characterized in that: offer conduction hole (72) on flame protective cover (7).

6. according to the arbitrary described heat accumulating type high combustion rate burner of claim 1 to 3, it is characterized in that: a high-speed fuel gas pipeline (9) is set outside combustion cavity (4), high-speed fuel gas pipeline (9) directly feeds burner hearth, and the end of high-speed fuel gas pipeline (9) is provided with the spout (91) of reducing shape.