The flat flame burner of automatic igniting of band and flame detecting device
The utility model relates to metallurgical technology field, relates in particular to a kind of novel burner on heating furnace and the heat-treatment furnace that is applied to automatic igniting and flame detecting device.
The flat flame combustion technology is on strong rotating jet combustion technology basis, grow up a kind of novel, efficient, clean combustion is technological.Since coming out the sixties in last century, especially in metallurgical industry, be widely used at industrial department.The flame of flat flame burner ejection be pasting the furnace wall to around the disc thin layer that stretches, promptly form subtended angle and be 180 ° open and flat flame.Flat flame burner has compared with general updraft burner that flame holding is good, Flame Temperature Distribution evenly, NO
2Generate series of advantages such as discharge capacity is few, the workpiece heating is fast, anti-oxidation, be mainly used in heated parts can not with industrial furnace that naked light contacts on.
In the iron and steel metallurgical industry, flat flame burner is mainly used in two aspects at home: the one, and adopt the heater for rolling steel furnace roof of conventional combustion system all to be furnished with flat flame burner, this type burner power is bigger, generally in 150 ~ 300kw scope, adopts manual ignition.The 2nd, on heat-treatment furnace, adopt low power flat flame burner to carry out low-temperature heat or drying, burner power generally is not more than 100kw, also adopts manual ignition.The flat flame burner of manual ignition can not be realized pulse control under the situation that needs furnace temperature accurately to control, can only be with constant power to the burner hearth heat supply.
The utility model content
To the problems referred to above, a kind of burner of the utility model design with automatic igniting and flame detection, one of its utility model purpose is to form stable, uniform open and flat flame; Another purpose is to realize the accuracy of switch control to guarantee that furnace temperature is regulated.
For reaching above-mentioned purpose; The technical scheme that the utility model adopts is: a kind of flat flame burner with automatic igniting and flame detecting device, and it mainly includes burner block, air duct housing, gas piping housing, coal gas core pipe, air-distributing disc, gas-jet flame holder; Burner block is provided with the spout that is bell mouth shape; The end face that connects the air duct housing on the sidewall of burner block spout path one side; Air duct housing other end connects the gas piping housing; Coal gas core pipe end passes from air duct housing center, stretch in the spout in the burner block fix with the welding of gas-jet flame holder, head end is fixed on the gas piping housing and be communicated with gas inlet on the gas piping housing; Suit air-distributing disc on the gas-jet flame holder, air-distributing disc sidewall are provided with a circle inclined hole, and inclined hole is assembled towards side coal gas core pipe end direction, and the air-distributing disc circumferential edge is along being provided with a circle tilted slotted hole that makes gas form adherent eddy flow; Gas-jet flame holder sidewall has a ring through hole; The air duct housing is provided with the air inlet and the first pressure valve, and air inlet links to each other with air pipe line, and the first pressure valve is connected with air gauge; The gas piping housing is provided with gas inlet, two electrode holes, peep-hole and the second pressure valves; Gas inlet is connected with gas piping; Electrode penetrates the spout of burner block through electrode hole, and end is positioned air air-distributing disc end, and the second pressure valve is connected with air gauge; Electrode is electrically connected with high voltage package, and high voltage package is electrically connected with controller; Electrode is electrically connected with controller, and gas piping is provided with electromagnetic valve, and the control end of electromagnetic valve is electrically connected with controller.
Said gas-jet flame holder is the cap-like structure of an end opening one end sealing, and openend is communicated with said coal gas core pipe, and blind end is provided with the matrix shade, is provided with opening through hole perpendicular to axial direction between shade and the said air-distributing disc.
Be provided with fixed head between said burner block and air duct housing, weld anchor studs on fixed head and the burner block.
Be provided with the burner conduit between the spout of said burner block and the air-distributing disc, the burner conduit embeds in the spout of burner block path side.
Be equipped with the hand valve on said gaspipe line and the air pipe line.
The beneficial effect of the utility model: when keeping the intrinsic advantage of flat flame burner, creationary increase is igniting and functions of flame detection automatically, has realized switch control, for the combustion system of using flat flame burner realizes pulse control basic condition is provided; Unique air-distributing disc and the design of incorporate gas-jet flame holder can form stable open and flat flame, have guaranteed the uniformity of fire box temperature, and structure wants compact than common flat flame burner, are convenient to process and assemble; The whole employing of burner modularized design is used and system maintenance is transformed very easy.The type burner power regulating range is big, and the burner of different size can be realized the heating efficiency that 20～600kw does not wait, can be adaptable across workpiece heating and heat treatment field.
Description of drawings
Fig. 1 is the sketch map of the utility model example structure;
Fig. 2 is the left view of the utility model embodiment;
Fig. 3 is air air-distributing disc and the gas-jet flame holder parts assembling sketch map of the utility model embodiment;
Schematic three dimensional views when Fig. 4 uses for the utility model embodiment;
Fig. 5 is the utility model embodiment control principle sketch map;
Description of symbols among the figure: 1-burner block, 2-burner conduit, 3-gas-jet flame holder, 4-air-distributing disc, 5-coal gas core pipe; 6-air duct housing, the 7-first pressure valve, 8-gas piping housing, 9-peep-hole, 10-electrode; 11-electrode hole plug, 12-earthing screw, 13-air intlet, 14-gas inlet, the 15-second pressure valve; 16-body of heater surface, 17-gaspipe line, 18-electromagnetic valve, 19-hand valve, 20-air pipe line; The flat flame burner that the 21-band is lighted a fire automatically and flame detects, 401-electrode hole, 402-inclined hole, 403-tilted slotted hole.
The specific embodiment
For understanding the utility model better, be described further below in conjunction with embodiment and accompanying drawing technical scheme the utility model, referring to Fig. 1 to Fig. 5:
According to the flat flame burner of automatic igniting of the band of the utility model enforcement and flame detecting device, it mainly comprises burner block 1, air duct housing 6, gas piping housing 8, coal gas core pipe 5, air-distributing disc 4, gas-jet flame holder 3.
1 is for having the cylinder of trumpet type spout, horizontal positioned.Weld anchor studs on its afterbody fixed head, 1 dozen of pours moulding of burner block, 1350 ℃ of long-term serviceability temperatures, high-temperature resistant grade can reach 1600 ℃; Diameter imported and exported by burner block
1 and length is calculated definite according to the necessary condition of burner power and the formation of open and flat flame: at first choose suitable coal gas spray orifice equivalent radius according to burner power and design ejection flow velocity; And then according to swirl strength computing formula
calculating burner block
1 inlet diameter R; Wherein S is a swirl strength; Generally getting S ≧ 0.6 o'clock can form strong eddy flow and then form open and flat air-flow; R is a coal gas spray orifice equivalent radius, and α is an air air-distributing disc eddy flow angle.Calculate burner block
1 bell-mouthed length according to swirl strength and flame spouting velocity afterwards, confirm discharge area and then definite burner block
1 big footpath size according to design power and flame ejection intensity again.Burner block
1 path side is equipped with burner conduit
2, and the end face of homonymy connects the end face of air duct housing
The 6 whole employing carbon steel precision casting moulding of air duct housing; Both ends of the surface are equipped with adpting flange and connect burner block 1 and gas piping housing 8 respectively through adpting flange; Air duct housing vertical direction is provided with air intlet 13, pressure mouth installing hole; Air intlet 13 is communicated with air pipe line 20, and pressure mouth installing hole is installed the first pressure mouth 7.Machine-shaping behind the gas piping housing 8 employing carbon steel precision castings; Vertical direction is provided with gas inlet 14 and is communicated with gaspipe line 17; The inner vertical channel that adopts is communicated with coal gas core pipe installing hole; Be provided with adpting flange with air duct housing 6 links; The other end has electrode mounting hole, peep-hole installing hole, earth stud installing hole and pressure mouth installing hole, the space gas pressure data collection when installing electrodes 10, peep-hole 9, earth stud and the second pressure mouth, 15, the first pressure mouths 7 and the second pressure mouth 15 are used for the burner debugging respectively.
Coal gas core pipe 5 head ends pass from air duct housing 6 centers; Burner conduit 2 backs of stretching in burner block 1 spout are fixing with 3 welding of gas-jet flame holder; End is fixed in the coal gas core pipe installing hole on the gas piping housing 8, and is communicated with gas inlet 14 on the gas piping housing 8.Suit air-distributing disc 4 on the gas-jet flame holder 3 can be regulated the position of air-distributing disc 4 in burner conduit 2 through installation dimension.Air-distributing disc 4 adopts numerical control machine-shaping; Sidewall is processed with a circle inclined hole 402, and inclined hole 402 is assembled towards side coal gas core pipe end direction, and air-distributing disc 4 circumferential edge are along processing one circle tilted slotted hole 403; Tilted slotted hole 403 oblique identical, thus make the gas that passes through form adherent eddy flow.Air through air-distributing disc 4 divides three grades, and primary air forms high-speed jet through 402 ejections of the inclined hole on the air-distributing disc 4, and the coal gas of gas-jet 3 ejections is broken up, and quickens space gas and mixes; Auxiliary air forms the adherent eddy flow of high speed through 403 ejections of the tilted slotted hole on air-distributing disc 4 circumference, and the condition of necessity is provided for the formation of open and flat flame; A small amount of tertiary air mainly plays cooling duct and repairs flame profile through the gap annular ejection of 2 in air-distributing disc 4 and burner conduit.
Gas-jet flame holder 3 adopts numerical control machine-shaping; Its side has a circle annular distance; The coal gas of ejection is broken up mixing by the high-speed jet of air-distributing disc 4 ejection, under the guide functions of steady flame head matrix shade, forms the gaseous mixture eddy flow, and the loudspeaker spout through burner block 1 forms open and flat flame.
One end of electrode 10 penetrates through the electrode mounting hole on the gas piping housing 8; Successively through being contained on the gas-jet flame holder 3 after gas piping housing 8, air duct housing 6 and the air-distributing disc 4; By the position of strict fitted position control electrode 10 ends, with the sparking effect of assurance with gas-jet flame holder 3.The other end of electrode 10 is electrically connected with high voltage package, and high voltage package is electrically connected with controller, by the discharge of controller control high voltage package.Electrode 10 is the detection port of electric access controller simultaneously, after the smooth combustion, loads 220V voltage on the same electrode 10; Between mode detecting electrode head through ion detection and the gas-jet flame holder 3 whether the retention flame is arranged,, then can form a closed circuit if any the retention flame; Electrode 10 returns a detection current value that about 4 ~ 40 μ A are big or small to controller, signal processing circuit that controller is integrated and A/D change-over circuit, and whether realization forms automatically flame is detected; If find that coal gas charges into, and not success of igniting need be controlled then and cut off coal gas immediately; Avoid taking place dangerous situation; So gas piping 17 is provided with electromagnetic valve 18, the control end of electromagnetic valve 18 is electrically connected with controller, and control electromagnetic valve 18 is closed to cut off the coal gas of gas piping 17.
The implementation process of the utility model is: flat flame burner 21 is built by laying bricks or stones through burner block 1 and furnace wall integral body or is added in addition on the body of heater surface 16 that mounting flange is fixed in firing equipment; Be equipped with hand valve 19 on gaspipe line 17 and the air pipe line 20; Can adjust the space gas flow and the proportioning of single burner through hand valve 19, to reach more satisfactory combustion efficiency.Earlier air hand valve 19 is transferred to correct position before the burner igniting; When controller is received ignition order; The discharge of control high voltage package makes electrode 10 sparkings, and the electromagnetic valve of controlling simultaneously on the gaspipe line 17 18 is opened, and coal gas feeds burner; With the combustion air mixed combustion that feeds burner always, return the detection electric current through electrode 10 behind the flame stabilization.When burner is received flame-out signal, close the electromagnetic valve 18 on the gaspipe line 17, fray-out of flame, combustion air continues to feed the effect of playing the cooling protection burner.Flat flame burner 21 flame holdings of automatic igniting of this band and flame detecting device are good, and Flame Temperature Distribution is even, NO
2The generation discharge capacity is few, and the workpiece heating is fast, can significantly reduce the oxidation that is heated workpiece, and can realize switch control, the heating and the heat treatment field that can be widely used in carrying out pulse-combustion control.
The above disclosed preferred embodiment that is merely the utility model can not limit the interest field of the utility model certainly with this, so according to the equivalence variation that the utility model claim is done, still belong to the protection domain of the utility model.