DE1071093B - Waste heat boiler with additional ceiling burner - Google Patents

Description

INTERNAT. KL. F 22 b

PATENT OFFICE

W23113Ia / 13a

REGISTRATION DAY: lO.'AP R IL 195 8 ''

NOTICE
THE REGISTRATION
AND ISSUE OF THE
EDITORIAL: DECEMBER 17, 1959

The invention relates to a waste heat boiler with additional top burner firing and introduction of the Exhaust gases in the fire gas flow of the additional firing, which heats a water pipe radiation chamber, for Utilization of the heat of hot exhaust gases with preferably a high content of fly ash, their separation. should take place in the radiation chamber of the boiler. In addition, a product should be used as an additional fuel .be exploited, that from poorly igniting and viscous waste materials from the chemical industry consists.

Since it is also required that the steam output of the waste heat boiler within wide limits and independently can be regulated by the amount of exhaust gas produced, even in the event that waste materials are only in are available to a limited extent is, according to the invention, a further additional burner for a liquid fuel, e.g. B. Bunker-C-Oil, or provided for fuel dust, its performance sufficient to ensure normal steam generation on its own if necessary;

Waste heat steam boilers have become known, the special ones located inside the boiler Firebox included, which with liquid or gaseous ..- migem Additional fuel is applied and the is surrounded by a second furnace, which is fed by the exhaust gases. At the top of the Combustion chambers combine the exhaust gases with the combustion gases and flow through the downstream ■ Heating surfaces together. But it is also known to discharge the exhaust gases and fire gases separately.

Furthermore, a steep tube boiler is known, in which of the flame of an additional burner is directed downwards from the ceiling of the combustion chamber and at their Reversal point above the ash funnel the exhaust gases be introduced into the flue gas flow of the additional combustion.

Finally, in the case of a boiler with a grate fire chamber, the combustion chamber located above the grate became relatively high and in this space the exhaust gas flow is introduced obliquely downwards to a to achieve complete turbulence and burnout of both gas streams.

If exhaust gases with a high content of fly ash, e.g. the exhaust gases from waste incineration plants, are in If radiant boilers are to be recycled, it must be ensured that the downstream heating surfaces are contaminated as little as possible by fly ash.

According to the invention, this is done in such a way that the exhaust gases through the periphery of the radiation chamber arranged, in the direction of the flue gas flow of the auxiliary firing openings are supplied will.

A waste heat boiler, known per se, with an additional ceiling burner is preferably used for this purpose

Applicant:

Walter & Cie. Aktiengesellschaft, Cologne-Dellbrück, Waltherstr. 51

Louis Mrklas, Cologne-Dellbrück, has been named as the inventor

Constriction in the radiation chamber located in the flame path of the additional firing, on its underside corresponding openings for the entry of the Exhaust gases are provided. ■. · ._. ■ .......

The constriction can also have a lining made of refractory material, which is preferably extends under the inlet openings of the exhaust gases. . ·. ■ · ■■

Around the ash particles carried along by the exhaust gases as much as possible already in the radiation room to separate, can advantageously at the lower end of the latter a protruding nose into the furnace be provided that a compaction of the common gas streams on the ash funnel front wall and then causes the diversion of the gas streams.

According to the invention, the disadvantages previously encountered in such boilers are avoided by a common large radiation chamber for the exhaust gases and fire gases is used in which the Exhaust gases burned out in an even distribution, primarily on the outer circumference of the flow of fire gas especially when the exhaust gases are sucked in by the overpressure of the fire gases and by deflection the common, z. T. mixed gas flow at the end of the radiation chamber, whereby the ash parts are mainly ejected into an ash funnel, which is in a known manner located at the bottom of the radiation chamber.

Further features of the subject matter of the invention result from one described below Embodiment.

The basic structure of the waste heat boiler according to the invention is similar to the known radiant boiler with a ceiling burner, straight flame path with flame reversal at the lower end, downstream

909 689/109

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overheating drafts and, subsequently,. ^: "

In the drawing, a boiler according to the invention is shown in vertical longitudinal section.

In the radiation chamber 3 open the ceiling burners 4, which are used for the combustion of gaseous or "liquid fuels in connection with other combustible waste from the chemical industry are set up or being fejnrien.

Approximately at the level of the middle of the radiation space 3 there is a constriction 5 in the boiler lining 6, which forms a ^{channel 7 lying between the outer walls of the fire chamber and 1 of} the boiler lining, to which the connection line 8 for the exhaust gases, which is indicated by a thick arrow are marked, · is brought up. The lower boundary of the channel 7 is formed by loosened boiler tubes 9, between which the exhaust gases pass and are sucked in like an injector by the flame of the burner 4, which flows downwards in the direction of the arrow, ao To increase the injector effect, it is advisable to ν the refractory lining 10 to extend the constriction 5 downwards in the manner of a shaft to approximately below the inlet openings of the exhaust gases, as a result of which any additional fuels that have not yet been burned can drip off.

As a result of the swirling flow of the flame, both types of gas are swirled with one another in the lower part of the radiation space 3. _: and. the ash parts have already largely been brought up to the boiler walls. Since the exhaust gases usually contain a considerable excess of air: 'They serve to a certain extent as a substitute for secondary air for the burner flame; however, secondary air can also be supplied separately if necessary. Through the protruding nose 11 on the rear wall of the radiation chamber 3, the gases are pushed off to the side and then deflected in the ash funnel, with further ash components being thrown out. Behind the slag trap pipes, the returning gas flue 16 containing the superheater registers 12 to 15 follows, from which the gases each flow through a descending or ascending flue 17, 18 lined with wall and contact pipes / in which further dust separation takes place. '- ■■' ^:

"'Finally" follows the last, further touch heating surface 'Containing train 19, from which the exhaust gases pass into the discharge duct 20.

V In the exemplary embodiment, the boiler is equipped with a lower or upper drum, but it can In connection with the radiation chamber 3, another type of boiler can also be used.

Due to the injector-like sucking in of the exhaust gases, pressure fluctuations of the same are largely reduced balanced, and the exhaust gases can be fed to the connection piece 8 without pressure.

Claims (4)

PATENT CLAIMS: 1. Waste heat boiler with additional ceiling burner and introduction of the exhaust gases into the flue gas flow the additional firing that heats a water tube radiation chamber by arranged on the circumference of the radiation chamber (3), in the direction of the flow of fire gas '' Additional firing (4) pointing openings for feeding of the exhaust gases. 2. Waste heat boiler according to claim 1, characterized in that the radiation chamber (3) with lying in the flame path of the additional fuels ' Constriction (5) is provided, the underside of which has the openings for the entry of the exhaust gases. 3. Waste heat boiler according to claim 1 or 2, characterized in that by one made of refractory material,. shaft-like extension (10) of the Constriction (5) in the radiation chamber (3), which preferably extends below the inflow openings for the exhaust gases is enough. 4. Waste heat boiler according to one of claims 1 to 3, characterized in that the lower End of the radiation chamber (3), but above the passage opening for the combined exhaust gas flows a protruding nose (11) is provided in the furnace, which constricts it the exhaust fumes in the direction of the ash hopper "front wall with subsequent deflection of the gas flow · causes. '' Considered publications: German Patent No. 554,989; "Swiss Patent No. 170 559; Magazine "Fuel, Heat, Power", October 10, 1957, p. 475, illus. 1 sheet of drawings © 909 689/109 12:59