DE1526045A1 - Method for operating a steam generator and steam generator for utilizing waste heat from converters - Google Patents

Description

Procedure for operating a steam generator and Steam generator to utilize the waste heat from converters.

CD O <O OO K)

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The invention relates to a method for operating a steam generator and a steam generator! which allows the waste heat from steel converters to be used to a large extent.

Cooled chimneys for converter systems are known, which have a double wall, between which the coolant flows, or which consist of cooling tubes, which are suspended from a shoring.

The disadvantage of the known types of chimney is the attachment of coverings to the walls, which from the Bubble chimney ejection and often become heavy and difficult to remove.

It has already been proposed to widen the lower part of the converter chimney and in it several, across the. Flow direction of the converter exhaust gases running Arrange rows of pipes that cover the entire chimney cross-section at least in the radiation area capture the projection.

WALTHIR »CW. SHARESELLSCHAPT · COLOGNE-DELLBRÜCK

Sheet ^ for writing on the date:

i-

These rows of pipes are used to intercept the coarser parts of the chimney ejection and into one below Divert collecting floor. They were not used as generators of useful steam at higher pressure Such an arrangement prevents the annoying chimney bears from settling.

The converter chimneys known up to now show no doubt there are still certain inadequacies in the company that resolve the task of the following. wrote Invention is ο

In the case of the known waste heat converter steam generators, not enough attention has been paid to converting the considerable amount of carbon monoxide that is formed during blowing and at the maximum burning rate of the carbon up to $ 90 of the amount of gas emitted into CO in the lower part of the converter chimney " to burn. According to the invention, the lower part of the converter chimney is therefore designed as a combustion chamber, to which the necessary combustion air is directly supplied in a controllable amount and is intimately mixed with the converter exhaust gases. For this purpose, the oxygen lance is surrounded with a large amount of play by a cooled pipe socket, to which the required combustion air is provided under the corresponding °. Pressure is applied. Swirl learn nte ensure a strong turbulence in the air supplied, the

ro. ■

ro essentially opposes the converter exhaust gases

Q "is directed and is thereby intimately mixed with them. According to a further feature of the invention m , the combustion chamber is dimensioned in its volume, in particular in its height, so that the time required for the combustion of the CO gases is available, before the exhaust gases enter the actual chimney, where they give off their heat first through radiation and then through contact

Due to the extensive combustion of GO to CO ^ the steam yield is compared to the known Orders considerably increased and deflagrations are avoided.

By installing the cross pipes that have already been suggested by other parties, the attachment of bears in the chimney can largely be prevented. Bin further feature of the invention consists in the arrangement of cooling pipes of an existing pool hopper as a conclusion of the combustion chamber below the transverse tubes, which also from the _chimney: receiving by falling down slag particles. In addition, there are bulkheads in the collector, which divide up larger ejecta and carry a cooled tubular grate in the form of a grid above or below, on which larger pieces remain, so that the heat of the ejected hot IPest particles is also absorbed. Upper hall) of the collecting funnel, a wide, cooled opening is provided in the rear wall of the cooling pipe of the combustion chamber, into which a work platform or the carrier for a work vehicle can be inserted. The work trolley is used to transport material for the lining of the converter or to monitor the combustion chamber during downtimes. Further individual hei _o te η of the invention will be apparent from an embodiment shown in the drawing ^ embodiment.

J ^ Herein show:

^^ Figo 1 a vertical longitudinal section through the O ₀ ^N combustion chamber with attached chimney.

- * Fig «» 2 a vertical longitudinal section after the

· "... ■ Line ΊΙ-ΙΙ of Fig. 1»

The inlet connection is located above the converter 4 5 »which introduces the expelled gases into the combustion chamber 6. Next to the inlet connection 5 is the slag collecting funnel 7,

the upper part of which has chilled hands. Some bulkheads 8 made of Klüilrohreη traverse the Lriehterraum in the transverse direction "below or above • the shadow lies a grating 8a consisting of cooling pipes, which catches larger lumps of cinder". In the combustion chamber 6 there are numerous transverse tubes 9 for the coarse separation of the slag parts carried along. The tubes 9 at the same time favor the distribution of the η combustion air blown in and the gases emitted from the converter, which predominantly consist of CO and a small part of CO _? exist, so that before the entry of the gases into the actual chimney 1o the combustion of the CO to CO ₂

α can be carried out. In the chimney 1 ο are the Be

Agitation she1zrohrregister 11 housed in the usual way.

The .Zufungslanze 12 for the oxygen in known orphan by means of a slide 13 on a A chilled one penetrates through the grain 14 Tube 15 "the ζ" Boaus individual close together close-lying vertical individual pipes that open into collectors at the top and bottom and preferably a water cooling system that is independent of the boiler circuit obtain. The tube 15 can therefore be easily removed for itself * The tube 15 has a we sent-

Ä ο borrowed, greater clear width than the lance

<° knife, so that around the lance the

k> Combustion required additional air under swirl

> ^ Effect can be injected. The air is

for example from a Greblase 16 via a line

- »17 ^^ introduced tangentially into the tube 15. Further

Twist bodies can be inside the tube 15 or be arranged on the outside of the Sauer st off lajize 12, . so that the swirl body is in the working position

der'lance in the interior η of the tube 15 are «The Tube 15 is obei ^ & iroh a loose Deokel 18 removed, the one i'angtrienter / $ for the introduction

the oxygen lance 12 receives

A two-jaw clamp 1 is located above the cover 18 those in the retracted state when Bubble vibrations of the lance 12 slows down.

Another detail of the invention consists in the arrangement of a retractable into the combustion chamber 6 Working device. For this purpose, a larger opening is provided in the rear wall 2o normally closed by a cooled door 21 ' is. When the system is shut down, telescopic supports 23 can be passed through the door from a work platform 22 be retracted, which rest on the funnel edge at 24 and further on supports 25 on the opposite wall.

This gives the possibility of a working platform in the combustion chamber 6 for inspection and repair purposes build, or to drive a reel trolley 26 over the converter 7 to the required Carry out repair work on the converter lining.

Below the funnel 7 a subdivided pallet shaft 27 is arranged, from which the slag is transferred to a cooled conveyor belt 28 or the like. is abandoned, <° from which it is transferred to a common for several converters

co sames transversely guided conveyor belt 3o arrives.

As a result of the downward air currents of the in

^. the center of the ascending gas flow is whirled in

α, takes place in the combustion chamber 6 a spontaneous

JjJ tane combustion of the CO to GO ₂ instead, with the

Heat passes at source on the wall cooling pipes and the transverse rows of tubes 9, and virtually ignore any unburned CO Eeste in the actual converter fireplace 1o that could trigger ^{0 he} Verpuff Ungen there or in the naohgeschalteten dust separators afterburning.

Therefore, a descending (3-point phrase is not required, but it can be the downstream loading. Stirring heating surfaces can only be accommodated in the ascending chimney 1o, especially since there is a risk of varnishing by the upstream cross tubes 9 substantially is degraded. In addition, fall all of the cross tubes 9 impacting slag te high and the deposits in the chimney 1o in the Schlaok collecting funnel 7, and not in or on the converter mouth, as the Pail has hitherto been.

The main difference compared to the previous ones known types of converter chimney & is located however, according to the invention in the knowledge that the The system is to be designed according to the principles of a gas-fired steam generator, and not just as a Cooling chimney. In order to achieve »perfect water circulation, we recommend the forced flow for the Steam generator, taking for the required steam storage several / working in batches ^ Converter drums or a special accumulator are to be provided. The steam generator is in the usual way on the, ceiling of the support structure by means of Tie rods are suspended, and the eccentric load support of the combustion chamber takes place via slide bearings on the supporting structure, the vertical movement * £ de »the entire steam generator for temperature equalization

<d, but the tilting moments that occur

to take. The entire pipe box is preferred

^ J made of fins welded together gas-tight

° pipes manufactured.

öJ The invention can also be structurally different

Realize way as shown, provided they works according to combustion principles.

Claims (1)

Pate nt demanding 1) Procedure for operating a steam generator to utilize waste heat from converters, characterized in that following the Converter connection a combustion space (6) of corresponding volume is arranged in which all or major incidental CO grass amount during blower operation through admixture of fresh air is burned to COp before the Exhaust gases pass into the actual chimney part (io) * 2) Steam generator for carrying out the process according to claim 1, characterized in that in addition to the inlet pipe consisting of cooling tubes η (5) for the Converter exhaust gases a slag collecting triohter (7) is arranged, the upper part of which is lined with wall cooling pipes, and in this part Partition walls (8) are arranged from cooling tubes, above or below the same a cooled Grating (8a) lies » 3) steam generator according to claim 1 or 2, ^ characterized in that transverse to the direction ° the converter exhausts several rows of kettle tubes (9) oo pull through the combustion chamber (6) in the κ, projection of the entrance to the chimney (io) min- ^ at least just cover it. _ »4 / steam generator according to claims 1 to 5, characterized in that the oxygen lance (12) with wide play in a coupled ear (15> is introduced to which the additional combustion air is supplied in a controllable amount. I JiUUtvJ . * ■ '■■■ 5) steam generator "according to claim 4» characterized in that the wall of the Tube (.1.5) consists of closely spaced vertical individual tubes, the top and bottom flow into a collector and to a special water • cooling are connected with the pipe (15) can be easily removed. 6) Steam generator according to claim 4 and 5 » characterized »by swirl blades or the like. in the Eohr (15) or on the oxygen lance (12). 7) Steam generator according to claim 4 » characterized in that fresh air is fed vertically or tangentially to the pipe (15), and the upper opening through a loosely lying lid with a funnel opening for the introduction the lance (12) is closed η i st « 8) Steam generator according to claim 1 and the following, characterized by a larger opening in the rear wall (2o) of the combustion chamber (6), which can be closed by a cooled door (21) is, and the retraction of telescopic beams (22) and a reel trolley (26) to carry out repairs to be able to perform in the combustion chamber (6) or in the converter (4). 9) steam generator according to claim T to 8, characterized in that the pipe system is operated in forced operation 10) steam generator according to claim 1 to 8, characterized in that it is made gas-tight to one another welded fin tubes. 11) Steam generator according to claims 1 to io, characterized by a "special cooling system for the cross pipes (9) in the "combustion chamber (6), , preferably from ; gerijigeni print Blank page