Title:
Under-fired coke oven
United States Patent 2159359


Abstract:
The present invention relates to underfired regenerative coke oven batteries and the general object of the present invention is to provide such a coke oven battery with improved means for supplying a combustible agent, lean. fuel gas or air, to the regenerator in which it is to be preheated....



Inventors:
Philipsen, Nikolaus M.
Application Number:
US21223138A
Publication Date:
05/23/1939
Filing Date:
06/07/1938
Assignee:
Otto, Wilputte Ovenbouw Mij Ott
Primary Class:
Other Classes:
202/143
International Classes:
C10B5/10
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Description:

The present invention relates to underfired regenerative coke oven batteries and the general object of the present invention is to provide such a coke oven battery with improved means for supplying a combustible agent, lean. fuel gas or air, to the regenerator in which it is to be preheated.

More specifically, the object of the invention is to provide means for supplying the combustible agent to be preheated in a regenerator, to the latter through a horizontal channel formed in the lower portion of the coke oven battery masonry and extending from one side of the battery to the other, and separate from, and at a lower level than the sole channel of the re.generator, and having outlets to the regenerator, distributed along its length, and to provide simple and effective means, associated with each outlet and accessible for adjustment by an attendant in the basement space beneath the coke oven masonry mass, for regulating the flow through said outlet.

In a hairpin flue oven battery, the outlets from each such channel are advantageously arranged to correspond in number, and in location relative to the sides of the battery, to the twin flues receiving the combustible agent from the regenerator, and in such case, the regenerators may each be divided into a series of vertical compartments, each connected at its upper end to a corresponding twin flue and receiving combustible agent at its lower end through a corresponding outlet'from the corresponding masonry supply channel.

Of the drawing: Fig. 1 is a partial transverse section of a coke oven battery; Fig. 2 is a partial section on the line 2-2 of Fig. 1; and Fig. 3 is an enlarged section through a flow regulating device, the section being taken on the line 3-3 of Fig. 1.

The coke oven battery structure shown in the drawing comprises a foundation A and pillars or columns B extending upward from the foundation, and supporting the masonry mass C,. in which the coking chambers and associated heating flues, regenerators and flow passages or ducts are formed, the masonry mass being spaced by the pillars B away from the foundation A to provide 80 the'characteristic basement space a of an underfired coke oven battery.

The.horizontally.elongated coking chambers D are arranged side by side, extending transversely to the length of the battery, and alternating with U heating walls E. The latter is formed with vertical heating flues, which, as shown, are of the hairpin type, each comprising two side by side branches e and e' connected at their upper ends, and separately connected at their lower ends to regenerators as hereinafter described. 'Beneath each heating chamber, and extending longitudinally of the latter, is a supporting or pillar wall F, and between each two adjacent supporting walls F, are two parallel intermediate walls f.

Between each two adjacent walls / is a regenerator G, and between each wall / and the adjacent wall F is a regenerator H. In the arrangement shown, each regenerator H is connected by ducts h to one set of heating flue branches e or e' in the one immediately adjacent heating wall E, and each regenerator G is connected by ducts g to one set of flue branches e or e' in the adjacent heating wall at one side, and is connected by ducts g' to the other set of branches e' or e, in the adjacent heating wall, at the other side of the last mentioned regenerator.

Rich fuel gas may be supplied to the lower ends of the flue branches e in each heating wall by a corresponding set of vertical channels I formed in the subjacent wall F, and may be supplied to the flue branches e' in the same heating wall, by vertical channels i arranged in the wall F and alternating along the length of the latter with the channel I. As shown, a pair of rich fuel supply pipes J and j are located in the basement space adjacent and parallel to the lower edge of each wall F, and are connected to the channels I and i, respectively, in said wall, by individual branch pipes J' and j'. The flow through each of the different branch pipes J' and j' may be 35. regulated by adjustment of a corresponding regulating device J2 or j2, associated with said branch pipe, and accessible for adjustment by an attendant working the basement space a.

Beneath each of the regenerators G and H, is a corresponding sole channel G' and H', respectively, and each connected at one side of the battery to a waste heat tunnel L, through a corresponding reversing valve M. Each sole channel may also be connected at the opposite side of the 45. battery to a second waste heat tunnel L (not shown) through a corresponding reversing valve M.

In so far as above, described, the coke oven battery construction shown in the drawing, involves no feature of the present invention, but is a typical, well known, and conventionally illustrated, form of an underfired regenerative coke oven battery, with which the present invention may advantageously be used. In the normal and 6 contemplated operation of such a known battery, when the coking chambers are heated by the combustion of rich fuel gas, supplied alternately to the flue branches e and e' through the channels I and i, respectively, the regenerators G are used in preheating air for combustion, and when the coking chambers are heated by the combustion of lean gas, the regenerators G are used in preheating that gas. With either mode of operation, the regenerators H are used in preheating combustion air. Customarily in such a battery, the combustible agent to be preheated in each regenerator G or H, is supplied through a reversing valve at one or each end of the corresponding sole channels G' or H', respectively.

In accordance with the present invention, the combustible agent, air or lean fuel gas, to be preheated in each of the regenerators G, is supplied to the latter through a corresponding supply channel N in the lower portion of the masonry mass C, and extending horizontally from one side the battery to the other, and air to be preheated in each regenerator H is supplied to the latter through a corresponding horizontal channel O in the lower portion of the masonry mass C and extending from one side of the battery to the other.

As shown, each regenerator G may receive either air or lean fuel gas to be preheated at a suitable pressure, which ordinarily may 'well be somewhat 80 above atmospheric pressures, through a corresponding branch P' from a main P. extending longitudinally of the battery at one side of the latter. As shown, each pipe branch P' includes a reversing valve P2. As shown, each dhannel O 85 may receive air at suitable atmospheric pressure, or preferably in most cases, at a pressure somewhat above atmospheric pressure, through an individual branch Q' from an air supply main Q extending longitudinally of the battery adjacent one side of the latter. Each branch Q' is shown as including a reversing valve Q2.

The combustible agent to be preheated in each regenerator G or H is supplied to the latter, through a multiplicity of branch supply connections R distributed along the length of the corresponding supply channel N or 0, respectively.

As shown, there are as many branch connections R from each supply channel N and 0, as there are twin heating flues in each associated heating wall, and the discharge ends of the connections R are so arranged that the most direct path of flow from the outlet end of each branch R to an adjacent heating wall, is to the portion thereof including the twin flue at the same relative distance as said branch from either side of the battery.

With the above described arrangement, an adjustment in the relative amounts of combustible agent discharged through the different branches R from a conduit N or O tends to a corresponding relative adjustment in the amounts of the cor-. responding combustible agent received by the correspondingly located twin flues in each adjacent heating wall. This control of the supply of the combustible agent to the twin heating flues connected to the upper end of a regenerator G, by regulation of the amounts of combustible agent supplied to the lower portion of the regenerator through the branches R, may be made more positive by providing transverse partition walls G2 in each regenerator G, to divide the latter into a longitudinal series of vertical regenerator compartments, respectively connected at their upper ends to the correspondingly located twin flues In each adjacent heating wall. Similarly, each regenerator H may be divided into a plurality of compartments, respectively supplying preheated air to the correspondingly located twin flues of the adjacent heating wall, and receiving air through corresponding branch connections R from the corresponding channel 0.

In accordance with the present invention, the discharge of air or gas through each branch connection R may be regulated from the basement space a. To this end, in the construction shown, each branch connection R is formed by a vertical pipe extending through the corresponding channel N or 0, and communicating with the channel through a vertically elongated lateral port R', and opening at its upper end into the correspending regenerator sole channel G' or H', and having its lower end below the underside of the masonry mass C.

As shown, the pipe R is externally threaded at its lower end, and is normally closed by an internally threaded cap member R2, which supports an obturator R3 throttling the port R'. As shown, the obturator R3 is in the form of a cylinder or sleeve valve loosely received in the pipe R, and having its upper end at a level somewhat below the level of the top of the port R'. By a vertical adjustment of the obturator R3, or by the replacement of an obturator R3 of one length by an obturator of suitably different length, the flow capacity of the corresponding port R' may be varied as conditions make desirable.

In the particular arrangement shown, the threaded portions of each pipe R and its closure member R2 are elongated to permit a suitable variation in the throttling action of the correspending obturator to be effected by rotation and resultant change in level of the closure member R2. As will be understood, however, the flow through the different outlets from each regenerator supply channel may be regulated from the basement space through regulating devices very different from those shown.

As shown, the channels N and O are formed in the reinforced concrete deck or slab member C' forming the lower portion of the masonry mass C, and supporting the brickwork constituting the upper and major portion of said mass, the deck member C' being somewhat thicker than has been heretofore customary to permit the incorporation therein of the channels N and 0. While to provide proper space for the channels N and O, it is necessary in general to make the vertical distance between the top of the subway space and the level of the bottoms of the regenerator sole channels G' and H' somewhat greater than has been heretofore customary, the battery structure need not be otherwise modified, or complicated in any way to permit the use of the present invention. The invention permits the amounts of combustible agent to be preheated, which are supplied to different longitudinal portions of each regenerator, to be regulated in the same general manner as the supply of rich fuel gas to the flues in different portions of the length of each oven heating wall has heretofore been regulated in underfired coke ovens. The invention thus permits the full realization of the advantages of the underfiring principle. Furthermore, the fluid flowing through the channels N and 0 has a cooling effect on the lower portion of the deck, and thereby desirably lowers the temperature maintained in the basement space C.

While in some cases, the lean fuel gas and.air may be supplied to the channels N and O vt atmospheric pressure, I contemplate that ordi- 76 narily they will be supplied at pressures slightly above atmospheric pressures, so that the pressure drops in the restricted flow regulating portions of the outlets, formed as shown by the ports R' may be high enough to facilitate regulation, and to insure a flow velocity through said outlet portions high enough to prevent or reduce dust deposits interfering with the desired regulation.

However, by the removal of each closure device R2, the corresponding pipe R, its port R', and the corresponding obturator R3, may be readily cleaned. Cleaning operations may also be effected without removal of the closure part R2, by providing the latter with an axial opening, normally closed by a removable screw plug R4.

While in accordance with the provisions of the statutes, I have Illustrated and described the best form of embodiment of my invention now known to me, it will be apparent to those skilled in the art that changes may be made in the form of the apparatus disclosed without departing from the spirit of my invention as set forth in the appended claims and that in some cases certain features of my invention may be used to advantage without a corresponding use of other features.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is: 1. In an underflred coke oven battery comprising a masonry mass above a basement space, the combination with coking chambers, flued heating walls, regenerators, and regenerator sole channels formed in said mass and all extending transversely of the battery, of a plurality of regenerator supply channels formed in the lower portion of said mass and extending transversely of the battery and respectively adjacent the different regenerators, each supply channel having a plurality of outlets distributed along its length for the outflow to an adjacent regenerator of fluid to be preheated therein, and regulating devices associated with the different outlets and each accessible for adjustment by an attendant in said space.

2. In an underfired coke oven battery comprising a masonry mass above a basement space, the combination with coking chambers, heating walls with vertical flues, lean fuel gas and combustion air preheating regenerators, and regenerator sole channels formed in said mass and all extending transversely of the battery and means accessible for adjustnent by an attendant in said space for regulating the supply of rich fuel gas to the heating wall flues, of a plurality of regenerator supply channels formed in the lower portion of said mass and extending transversely of the battery and respectively adjacent the different regenerators, each supply channel having a plurality of outlets distributed along its length for the outflow to an adjacent regenerator of air or lean fuel gas to be preheated therein, and regulating devices associated with the different outlets and each accessible for adjustment by an attendant in said space. 3. In an underfired coke oven battery comprising a masonry mass above a basement space, the combination with coking chambers, flued heating walls, regenerators, and regenerator sole channels formed in said mass and all extending transversely of said battery, of a plurality of regenerator supply channels formed in the lower portion of said mass and extending transversely of the battery and respectively adjacent the different regenerators, each supply channel having a plurality of outlets distributed along its length for the outflow to an adjacent regenerator of fluid to be preheated therein, each such outlet comprising a vertically disposed pipe- extending through, the corresponding supply channel and formed with a lateral port in the portion of the pipe within said channel and having its lower end normally closed, and a port throttling device within each pipe and adjustable from said space to vary the flow through the corresponding port. 4. In an underfired coke over battery comprising a masonry mass above a basement space, the combination with coking chambers, flued heating walls, regenerators, and regenerator sole channels formed in said mass and all extending 35, transversely of said battery, of a plurality of regenerator supply channels formed in the lower portion of said mass and extending transversely of the battery and respectively adjacent the differenet regenerators, each supply channel having a plurality of outlets distributed along its length for the outflow to an adjacent regenerator of fluid to be preheated therein, each such outlet comprising a vertically disposed.pipe extending through the corresponding supply channel and formed with a lateral port in the portion of the pipe within said channel, a closure for the lower end of each pipe in threaded engagement with the latter, and accessible for rotation by an attendant in said space, and a throttling device supported by said closure and vertically adjusted to vary the flow through the port in the pipe by the rotation of the closure.

NIKOLAUS M. PHILIPSEN. 55