US1027875A

US1027875A - Economizer, regenerator, and the like.

Info

Publication number: US1027875A
Application number: US65500311A
Authority: US
Inventors: Walther Mathesius
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-10-16
Filing date: 1911-10-16
Publication date: 1912-05-28
Anticipated expiration: 1929-05-28

Description

W. MATHESIUS. EGONOMIZBR, REGENERATOR, AND THE LIKE.

APPLICATION FILED 0 01. 16, 1911.

" Patented May 28, 1912.

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APPLICATION FILED OCT. 16 1911.

Patented My 28, 1912.

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' w. MATHESIUS.

EGONOMIZER, REGENERATOR, AND THE LIKE. APPLICATION FILED 00T- 1 6, 1911.

1,027,875, Patented May 28, 1912.

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W. MATHESIUS.

ECONOMIZER, REGENERATOR, AND THE LIKE. APPLICATION IILED 0OT.16, 1911.

1,027,875; Patented May 28, 1912.

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TlNTTET) STATES PATENT CFFTQE.

WALTI-IER MATHESIUS, OF GHARLOTTENBURG, GERMANY.

EGONOMIZER, REGENERATOB, AND THE LIKE.

Application filed October 16, 1911.

To all whom it may concern:

Be it known that I, TVALTHER MATHESIUS, a subject of the King of Prussia, and resident of 10 Carmerstrasse, Charlottenburg, near Berlin, Germany, professor, have invented certain new and useful Improvements in Economizers, Regenerators, and the Like, of which the following is a specification.

This invention relates to improvements'in economizers, regenerators and the like, for utilizing the heat of waste gases and the like, and has for its object to provide an improved construction thereof which will enable the utilization of the heat from large quantities of such gases.

The apparatus is especially applicable for metallurgical works and particularly in combination with Cowper stoves where extraordinarily large quantities of waste gases often escape into the chimney at a temperature of about 500 C. Heretofore it has frequently been proposed to utilize this heat by means of economizers located between the Cowper stove and the chimney and to utilize this economizer for preheating the blast for the blast furnace before supplying it to the Cowper stove for further heating. Such economizers necessitate as large a heating surface as possible, for example 1200 to 1800 square meters for a blast furnace 'of average size. For this purpose it has been usual to employ groups of iron tubes as the heating surface but in order to obtain an efficient working it is necessary that the tubes offer as little resistance as possible to the flow of the gases and that thetubes be continually freed from flue dust. If, however,the tubes are arranged in straightrows one behind another, the heating surface is not fully utilized inasmuch as the tubes are deprived of the heating effect of the gases by the tubes immediately in front thereof. It has therefore been proposed to arrange the tubes in staggered relation whereby twice the number of tubes are exposed to the direct contact of the hot gases. The gases are however deflected about 90 from their course betweeneach row of tubes and consequently the resistance to the flow of the gases is so great that the flow must be augmented by means of fans or like draft creating means. Moreover, while the straight rows of tubes permit the insertion of a scraping device be tween the tubes, the staggered arrangement renders this impossible.

Specification of Letters Patent.

Patented May 28,1912.

Serial No. 655,003.

According to the present invention, the foregoing deficiencies are obviated by alternating the tubes relatively to one another in such a manner as to form rows of tubes inclined at an acute angle to the direction of the flow of the gases. This arrangement enables proper utilization of the heat of the waste gases without occasioning any appreciable resistance to the flow, and further on ables the insertion of a scraper for continually removing the flue dust.

In order that the invention may be clearly understood, reference is made to the accompanying drawings, which show, by way of example, my invention as applied to an economizer for use in conjunction with Cowper stoves, part of the tubes being o1nitted for the sake of simplicity.

Figure 1 is a vertical section through the economizer on the line G-H of Fig. 3. Fig. 2 is a vertical section on the line A, B, C, D, E of Fig. 1. Fig. 3 is a cross section on the line J K of Fig. 1. Fig. 4 is a cross section on the line L M of Fig. 1. Fig. 5 is a detail plan view showing one group of tubes, a scraper for the tubes and chain scrapers between the tubes. Fig. 6 is a detail sideview of one tube and the scraper therefor. Fig. 7 is a detail plan view of two tubes with scrapers, the J.-iro11 z on the lefthand side being removed, and the upper tube be ing shown with its scraper in cross-section.

The economizer comprises essentially groups of tubes at which are arranged in the manner illustrated'in Figs. 3, 4: and 5, that is to say, in rows at an acute angle to the flow of the gases. The groups of tubes a which form the heating surface, are arranged between head'chambers b and b having flat sides 6 and a respectively, in which the wrought iron tubes are expanded in the usual manner. The waste gases are admit ted at (Z, traverse the two compartments formed by the central wall a and pass away at e. The cold air is supplied to the head chambers 12 at f and after traversing the tubes a and being heated therein passes out at g, the air moving in the opposite direction to the flow of the hot gases. The flue dust suspended in the hot gases settles on the tubes a and on the bottom 0 and is removed therefrom by scrapers, as hereinafter described. The flue dust on the bottom 0 is removed by means of scraperchains h, as shown in Figs. t and 5 which are arranged between each row of tubes and extend across the whole width of the apparatus. The chains h are continuously drivenv from an electro-motor 2' and gear driven shaft is. The chains 72, are endless and receive their movement from chain-wheels n on the shaft 70, the chains passing over guide-pulleys n at both sides of the apparatus and also over chain wheels 0 and o. The chains pass through wrought-iron tubes 79 in the outer walls 2 and central partition a, said tubes 20 closely surrounding the chains and being preferably fiared at their ends. The fine dust is conveyed to the intermediate spaces Z by the chains h and falls into dust chambers m.

The whole tube system of the apparatus is inclosed by the outer masonry z and is suspended therein by means of wrought iron hangers 1 supported from the roof 2. This suspended arrangement prevents the tubes from being submitted to bending stresses and at the same time permits them to expand and contract.

The space above the tubes at is divided 011 by means of plates 9 which preferably rest on the flanges of the plates 0 and in this space is arranged. the driving gear for the tube scrapers which comprises chain wheels 3 which are driven from an external chain wheel 5, chain 6 and electromotor 1' and over which passes an endless chain 4. The motor may be of such type that it automatically stops and reverses in rotation as soon as the scrapers have reached one or other point in their movement.

The scrapers for the tubes comprise ironframes which are supported by chains 8 from the chain wheels 3 and are moved vertically to and fro, the frames balancing one another so as to economize power. As shown in Fig. 5, the scraper frames comprise two strong U-iron girders t ridigdly connected together by a pair of I-iron beams u and angle-irons '0. Similar I-iron beams 24 are loosely supported by the girders t and intermediate each row of tubes (6, these beams a carrying the scrapers w surrounding the tubes at, as shown in detail in Figs. 6 and 7. Screwed or otherwise secured to the beams u and u are notched blocks :0 which position the upper split collar w by engaging lugs 1.0 thereon. The split collars to carry vertical rods w which support the actual two-part scraper 'w and are maintained in position by means of clamps, screws or the like, or as shown, by .L-iron beams y. The scrapers w press tightly on the tubes 0; and if desired, their contact may be insured by forming the lugs 10 of wedgeshape with or without a rounded lower edge, so that the pressure of the beams y thereon tends to press the scrapers w tightly against the tubes a. For this purpose it is also preferable to make the up er rings 10 of oval shape, as seen in Fig. so that they more nearly approach the tubes at in proximity to the lugs 10 than at right angles thereto.

The hereinbefore described construction of scrapers enables them to be fitted in economizers already built and enables any of the parts to be readily renewed.

I claim 1. In an economizer, regenerator or the like, a plurality of tubes arranged in rows inclined at an acute angle to the flow of the hot gases, said tubes forming the heating surface and offering little resistance to the flow of the hot gases while enabling the application of horizontally moving scraping devices.

2. In an economizer, regenerator or the like, a plurality of tubes arranged in rows inclined at an acute angle to the flow of the hot gases, said tubes forming the heating surface and offering little resistance to the flow of the hot gases, and a plurality of scraping devices intermediate the rows of tubes.

3. An economizer, regenerator or the like, comprising a chamber, inlet and'outlet hot gas connections to said chamber, head boxes spaced apart in said chamber andhaving oppositely facing fiat sides, a plurality of tubes between said head boxes and arranged in rows inclined at an acute angle to the flow of the hot gases, a plurality of scraping devices movable over the flat side of the lower head boxes and intermediate the rows of tubes, a dust chamber below said lower head boxes and air inlet and outlet connections to said head boxes.

4- An economizer, regenerator or the like, comprising a chamber, inlet and outlet hot gas connections to said chamber, head boxes spaced apart in said chamber and having oppositely facing flat sides, a plurality of tubes between said head boxes and arranged in rows parallel to one another in a direction at right angles to the flow of the hot gases and parallel to one another in a direction inclined at an acute angle to the flow of the hot gases, a plurality of scraping devices movable over the flat side of the lower head boxes and intermediate the rows of tubes at right angles to the flow of the hot gases, a dust chamber below said lower head boxes, air inlet and outlet connect-ions to said head boxes and scrapers movable vertically over said tubes.

5. In tubular economizers, regenerators or the like, scraping devices comprising a frame surrounding each. group of tubes, cross-supports in said frame .and intermediate the rows of tubes, and scrapers supported from said cross-supports and surrounding said tubes.

6. In tubular economizers, regenerators or the like, scraping devices comprising a frame surrounding each group of tubes, cross-supports in said frame and intermediate the tubes chain Wheels, chains passing around said Wheels and supporting said frames and so arranged that the frames balance one an-' 15 other, and means for driving said chain Wheels.

In Witness whereof I have hereunto set my hand in the presence of two Witnesses.-

\VALTHER MATHESIUS.

Witnesses VVOLDEMAR HAUr'r, HENRY I-IAsrER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C.