DE2325225C3 - Device for flaring flammable shaft furnace exhaust gases, in particular furnace gas in cupola furnaces - Google Patents

Description

The invention relates to a flaring of combustible shaft furnace exhaust gases, in particular of Furnace gas in cupolas suitable device, which from a flare burner working according to the Venturi principle tin! There is an intake opening for combustion air and Ziindbrenncrn for a fuel gas.

As a measure to prevent environmental pollution, it is known to pack off combustible exhaust gases. The existing devices for flaring are also used for flaring blast furnace gases used in cupola. In the known devices, the combustion air necessary for combustion is sucked in from below through a suction opening. From below there is also one or more Pilot burner initiated a fuel gas to ignite and to support the combustion of the exhaust gases. The pilot burners usually end near the gas outlet.

The above-mentioned difficulties arise mainly because it is in the Schachtofenbzw. Cupola exhaust to extremely inferior

ίο Exhaust gases with a lower calorific value of a few Kcal / Nm ³ and a gas pressure of only a few hundred mm / WS, which are saturated with water vapor and have a high content of toxic carbon monoxide. Both the low calorific value and the high water vapor content and the high carbon monoxide content cause particular difficulties when flaring, since the low calorific value and the high water vapor content do not allow a stable flame without special measures, while the poisonous carbon monoxide must be burned completely for reasons of environmental protection.

From the GDR patent specification 62 026, a high-pressure injector burner intended in particular for accompanying petroleum gases has become known, which consists of a conical torch funnel and to which primary air and gas are supplied from below. However, this known burner is intended for gases with a calorific value of several 1000 Kcal / Nm ³ and burner connection pressures of over 6000 kp / m ² , so for a completely different purpose than the registered burner.

The same applies in principle to one from the magazine "Gaswärme", Vol. 15, No. 10, October 1966, p. 340 to 342, known flare burners, with which gases are to be flared, their lower calorific values and Pressures are a multiple of the values of shaft furnace and cupola exhaust gases. In particular, deals the reference only on the problem of the lifting or detaching of a flame, d. H. with flames in front of the Outlet opening.

The invention is therefore based on the object of avoiding the aforementioned disadvantages when unwinding and in particular to provide a device for flaring combustible exhaust gases from cupola furnaces, which at lowest possible energy supply ensures optimal and stable combustion of the exhaust gases and in the In an emergency, the flame can also be extinguished quickly. The solution to this problem is based on the Realization that between the location of the pilot burner, the dimensions of the torch funnel and the location of the Ignition front a certain connection exists.

In detail, the invention consists in the fact that the torch satisfies the condition d ' : d: D: h:; i = 1: 1, 2 to 3: 2 to 6: 4 to 20: 3 to 15, where J is the diameter of the Inlet opening for the flammable exhaust gas that opens coaxially into the flare burner, d is the smallest diameter, or largest diameter and h is the height between the smallest and largest diameter of the flare burner and Pilot burner in the flare burner is the resulting height.

Ensure the continuation of the device the distance from the smallest diameter of the torch burner to the confluence of the ignition

6s burner on the one hand and the dimensions of the torch itself on the other hand, so that the combustion front is always in the Area of the pilot burner. This is vital because of the face of a burn

extremely low calorific value and the steam generator

• ng of the exhaust gases in question only then

"takes place. if the gas and the combustion air are good

It is mixed and the mixture is warmed up to such an extent that

Its high water content is harmless to combustion

-t and a reaction of coolant monoxide and

'^. material can take place. A sufficient diameter

hen the reaction partner is determined by the

Ratio between the diameter of the outlet opening

and the smallest diameter of the torch h corresponds essentially to the mixture pressure by the distance between the smallest η rhm knife of the torch burner to the confluence link Pilot burner is determined.

I _also ensure that the flame is not blown out by the wind, which the flame * torch burner must i because of Minderwertigklkcies shaft furnace exhaust gas particularly problematic • "always completely from the cone shell Z be enclosed what the pilot burners and the exit *> with the Abstad ash opening the torch burner, ie the difference between the height of the flare burner and the altitude between the see the minor diameter of Fackeibren- "e and the entry point of the pilot burner reaches S Finally, it must still be ensured for complete combustion of a ₅ J Kohlenmonoxyds that the Kegeiquerschnit, in the area of the pilot burner full SSd? is filled in by the ignition front. since in this case a peripheral ring of unburned exhaust gas would form, so that unburned carbon monoxide would escape through the opening of the flare burner. the ignition front completely fills the cross-section of the torch, the ignition cap must dem dorligcii Trichlc.durchmcsscr cm- «as through d» _ss o «ähl, _c Vcrl, äl, n» ™, _s chcn _JS ! “both IMn”. *, FackCbrcnners and

Brenner, egg

FIG. 2 shows a section along the line II-II of FIG. 1.

F i g. 3 a corresponding section, but with one other perforated disc position.

The device according to the invention for flaring flammable exhaust gases consists of a flare burner 1 working according to the Vcnturi principle opening into the pilot burner 2 on the side. A feed pipe 31 for the furnace gas to be burned is arranged at the lower tndc of the flare burner. The inlet pipe i protrudes with its end facing the flare burner 1 into an intake funnel 4 of the flare burner 1. At its inner end, the feed pipe 3 has an inlet opening 5 for the furnace gas. Between the feed pipe 3 and the outer wall of the cone-shaped funnel 4 there is a ring channel b, which can be used to suck in the combustion air necessary for the combustion of the exhaust gases from below. ng 7 which consists of a stationary annular disk 8 and a rotatable perforated disk 9. Both see ben 8 9, as from F. G. 2 and 3 hervorgeh, Dur.hir s ^ U and openings 12 which, being m-Liche, '"P ^ rm. The formed Drehbarke.t de}, by not Pictured he ^To * ^ e.gnet to twisting be.sp.els "use a cylinder. In the illustration nae: hl · g. -" ei the disks 8 and 9 with their passages of 11 and 12 are largely offset to one another, so that only a comparatively smaller one kelfo.m. _c er> urt step gap for the volume to be sucked in t tj Jm

gen 11 and 12 wulgcntna uD

_e , "Bcr Durchrmsqucrschnu Ι, η dc Luf ...

The air intake opening of the torch burner is adjustable. the Combustion with

S.mengc di _e combustion considerably s.örl. M ₁ , H ₁ Ic ^, ^ ₁₅ , _hck,, "" _c hn, e _ss cr

Ucibc »rotatable iv

lall. «* J ™ c sjer ■ M» κ * ,, - χ ^ ^ ^. _gi ,, _{|) c} "

"Fan dos.m n> dir U _t kU f ^ ™ _gc j _ic ,,.,", "", Innorhulh dos 1. "Kelhrenncrs

™ iu! Tv, nvug, e _s Ausrührangsbcispicl der I, ligation ", _e cl" h. ^ - "'i", si.l, erueben. Dal! N " _e elahr

, MindcrZeichnnngdargesielHundWudnnlolgende ,, '^ ™ ^ _{"ir Jic,"} "alnlndunf of

gg ^^ " _{ir Jic} ,", "af

S cSs erndungsge, "» n K.ckC 22 000 N S, Cchrgas n "," e "d, g are. After the,

At the time of the incineration, only 10 to ¹ JmVSt natural gas were required. In the experiments a flare burner 1 is used with four pilot burners with the following dimensions:

d '= 840 mm.
d = 1500 mm,
D = 3000 mm.

h = 8000 mm,
a = 3000 mm.

The measured temperatures on the outer jacket of the flare burner allow the use of normal Steel too. If necessary, a protective coat of high-temperature paint can be applied.

1 sheet of drawings

Claims (8)

Patent claims: 1. Device for flaring off combustible shaft furnace exhaust gases, in particular furnace gas in cupola furnaces, consisting of a flare burner working according to the Venturi principle with an intake opening for combustion air and pilot burners for a fuel gas, characterized in that the flare (1) meets the condition d ' : d: D: h: a = 1: 1.2 to 3: 2 to 6: 4 to 20: 3 to 15 is sufficient, where (d ') is the diameter of the outlet opening (5) which opens coaxially into the flare burner (1) for the combustible exhaust gas, (d) the smallest diameter, (D) the largest diameter and (h) the height between the smallest and largest diameter and (a) the height resulting from the smallest diameter (d) of the flare burner (1 ) up to the point where the pilot burner (2) enters the flare burner (1). 2. Apparatus according to claim 1, characterized in that the diameter (d ') of the exhaust gas outlet opening (5) corresponds to the value 0.2 to 0.4 V , where Vdit: throughput of the exhaust gas to be burned in cbm / sec. 3. Apparatus according to claim 1 or 2, characterized in that the Luitansaugöffung the Torch burner (I) is adjustable. 4. Device according to one or more of claims 1 to 3, characterized in that im Area of a supply line (3) which leads to the outlet opening (5) of the exhaust gas Annular gap (6) is provided with through openings (12) perforated disc (9) which opposite a stationary annular disc (8) also provided with openings (H) is rotatable. 5. Device according to one or more of claims 1 to 4, characterized in that the Disks (8,9) are plate-shaped and that the stationary disk (8) with its inner edge on Gas supply pipe (3) is attached. 6. Device according to one or more of claims 1 to 5, characterized in that the Passage openings (11, 12) in the disks (8, 9) are essentially trapezoidal. 7. The device according to one or more of claims 1 to 6, characterized in that the rotatable disc (9) is limited by stops. 8. The device according to one or more of claims 1 to 7, characterized in that the Pilot burners are adjustable.