US1651900A

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Publication number: US1651900A
Authority: US
Publication date: 1927-12-06
Anticipated expiration: 1944-12-06

Description

' Dec. 6, 1927.

Figl

Inventor: Gustav 9 His Attorney. A

Dec. 6, 1927.

1,651,900 G. PAGEL HEAT EXCHANGE DEVICE Filed Nov. 1926 2 Sheets-Sheet 2 Ihvehtd'": I Gustav PQgeL His Attovneg.

Patented Dec. 6, 1927.

NITED STATES l,fi51,9dh

PATENT OFFICE.

Gl'J'ETAV ."Pi-liG-EL, F GHARLOTTENBURG, GERMANY, ASSIG-NOR TO GENlllBAL ELEG'IRICI COMPANY, A CORPORATION OF NEl/V YORK.

HEA'IP EXGHATNGE DEVICE.

Application filed llcvember 9, 19%, Serial No. 147,314., and in Germany lleceuiber The present invention relates to a heat exchange device of the condenser or feed water heater type and more particularly to a device of this character for heating condensate or feed water by means of the exhaust steam from multistage steam ejector air pumps such asareused tor withdrawing air and "non-condensible gases from large surface condensers.

The object of the present invention is to provide an improved heat exchange device ofthe type and for the purpose above stated which operates to deliver heated feed water at a more uniform outlet temperature than has heretofore been possible with known heat exchange devices in the usual feed water heating arrangcn'ient and in conneetion with multistage steam ejector pumps.

The invention is herein described and illustrated, by way of example, in connection with a twostage steam ejector air pump in the operation of which in connection with a surface condenser, the hot well condensate from the condenser is ordinarily used in an intermediate condenser to condense the working steam from the low pressure or first stage of the pump and other condensible vapors brought over from the surface condenser, and the heated condensate is then used as cooling water in a series connected feed water heater which receives exhaust steam from the high pressure or second stage of the pump. With this arrangement the temperature of the feed water or condensate delivered by the feed water heater is subject to fluctuations in accordance with fluctuations in the quantity of heating fluid supplied by the ejector pump stages, since the intermediate condenser and the feed water heater are connected in series relation on both the cooling or feed water and the steam sides.

In accordance with the, invention, this undesirable fluctuation in feed water de livery temperature is avoided by providing a heat exchange device which in connection with a two-stage ejector pump, for example, serves as a combined intermediate condenser and feed water heater, with said condenser and heater connected in series on the steam side but in parallel on the cooling or feed water side. The distribution of the water or condensate to be heated. which also serves as cooling medium, is variable on the two sections of the heat exchange device. By

or, was.

means of the variable distribution of the cooling medium, a. uniform outlet temperature of the cooling medium from the heat exchange device and a uniform loading of the/cooling tubes therein are assured.

For a consideration oi what is believed to be novel and the invention, attention is new directed to the accompanying drawing, the following description thereof, and the appended claims.

In the drawing, Fig. l is a sectional side view of a heat exchange device embodying the invention and connected with a twostage steam ejector air pump; Fig. 2 is a similar View of a modification of the device shown in lfiig. 1, and F 3 is a detail of Fig. l, partly in section, showing a modification of a control means.

Referring to 1, 5 is the casing of the heat exchange device which comprises two duplicate heat exchange sections 6 and 7 located on opposite sides of a cooling water chamber 8. Each section is provided with a steam inlet 9 and an outlet 10. Drain outlets for the removal oi condensed steam are provided in the bottom of each section, as indicated at 11.

Each heat exchange section is provided with suitable cooling tubes 12 connected at their outer ends by partitioned end heads 13 and openin into the central water chamber 8 at their inner ends. The water chamber is suitably partitioned, as indicated at let, to provide for the parallel flow of cooling water or condensate from a cooling water inlet 15 through the tubes and end heads to a cooling water outlet 16, as indicated by suitably placed arrows. Spaced baflle plates 12 serve to distribute the heating medium about the cooling tubes.

In connection with the cooling water inlet is provided a suitable cooling water distributing or apportioning means which, in the presentexample, is located within the cooling water chamber adjacent the cooling water inlet and is in the form of a valve member 1'? controlled by a lever 18. lhe valve member is moved by the lever to increase or decrease the flow of cooling water through one section and to correspondingly decrease or increase the flow of cooling water through the other section as is obvious from an inspection oi the drawings, whereby the cooling water is distributed or apportioned to the sections oi the heat exchange device as desired.

.he cooling Water inlet 15 is connected with a suitable cooling water supply conduit 19 through Which condensate or other cool ing medium is supplied to the heat exchange device and is provided with a delivery conduit 20 in connection with the cooling Water outlet 16 through which conduit the heated cooling Water is discharged for use as feed Water for example.

In the present example, section 6 of the heat exchange device serves as the intermediate condenserand is connected at its inlet .9 with the discharge outlet 21 of the first stage 22 of a steam ejector air pump, which, on its suction end, is connected with a suction conduit '23 leadin from any suitconnected by a conduit 2% with the suction end of the second stage 25 olf the steam ejector air pump. This latter in turn is connected at its discharge end 26 with the inlet 9 of section 7 of the heat exchange device which serves as a feed water heater in the arrangement of the present example. Operating steam is supplied to the first stage of the pump through a pipe 27 and to the sec- 0nd stage through a pipe 28.

[The exhaust steam discharged from the first stage 22 of the pump which is the low pressure stage, condensed in the intern'iediate condenser provided by section 6 and at the same time the air and non-condensi'ble gases taken through conduit 23 are cooled. The resulting condensate is taken from the intermediate condenser through drain outlet 11, While the remaining cooled noncondensed mixture is pumped out through outlet 10 and conduit 24 by the second stage ot the pump which is the-high pressure stage, and delivered to section 7 ol the feed water heater, wherein steam not condensed in the intermediate condenser, together with the exhaust steam of the high pressure or second pump stage, is condensed. Non-condensible vapors and air are finally discharged through the outlet 10 of the feed Water heater and a conduit 29 connected therewith which leads to atmosphere. The resulting condensate is conducted from the teed water heater through the drain outlet 11 and a conduit 30 connected therewith. A similar conduit is .indicatedat 30 in connection with the drain outlet of the intermediate condenser or section 6. 7

By means of the distributing .or apportioning valve member 17, the flow of water through the intermediate condenser and feed water heater may be adjusted or apportioned in accordance with fluctuations in the quan tity of exhaust steam supplied by the ejector pump'stages, so that the cooling water or condensate may leave each of these'heat exchange sections at approximately the same temperature thereby resulting in a greater heat transfer and more uniform ellicicncy in other apparatus supplied thereby. For example, it the low pressure stage supplies an increasing quantity of exhaust steam, member 17 may be turned clockwise to in-- crease the flow of cooling Water through ecctionG and to correspondingly decrease the flow of cooling water through section 7,

thereby compensating for the unbalanced condition of the supply of heating medium to two sections oi the heat excl'iangc device.

This arrangement thus provides for the uniform loading of the cooling tubes and also provides for completely cutting out one of the heat exchange sections tomaintain operation with the other alone. A thormoineter or 0lllQltl1G11Il%1l indicator may be provided in the cooling water outlet 20, as indicated at 31. By means of the thermometer, an operator may observe the temperature of the cooling 'ater as discharged from the heat exchange device and correct any tendency of said temperature to il'luc'tua'te by il'lOVlllg the apportioning mcn'iber 17 by means ot' lever id to meet an increased supplv of heating medium in one section ortlie other with an increased llow of cooling medium.

The .d-istribuling member may be automatically as well as manually controlled i'l desired. For example, member 1'? may lit automatically controlled in .dcpeudcme upon changes in a variable quantity or value, variations in which al'l'ect the outlet temperature ol. the cooling water, such as the pressure or temperature of the operating steam supplied to low pressure stage of the pump. in the present example, an auto matic control means of this character is indicated at and operates as a pressure regulator in connection with supply conduit 28 with which it is connected by a pressure pipe 33. The pressure regulator is opcrutively connected with a lever I'l -lwhich is in turn provided with a lixed i'ulcrum at as. llhe lever is also connected by a link illi with lever 18 of the cooling water distributing or apportioning 'nicn'ibcr 17.

The operation of this arrangement is such that .an increase inthe pressure ol' the steam supply to ejector stage 22 causes the pressure regulator to move member 17 in a direction to cause a corresponding increase in the llow of cooling water through the section ol the heat exchange device supplied by said stage and, similarly, a decrease in the steam pres sure causes a corresponding decrease in the flow of said cooling water through said section of the heat exchange device.

In a similar manner member 17 may be automatically controlled in accordance with changes in the temperature oil "the cooling water discharged by either of the sections 01 the heat exchange device. Referring to i l g. 3 in which the same reference numerals as used in Fig. 1 are used for the sameparts, an

lllll ill) automatic arrangementof thischaracter is indicated in connection with the intermediate condenser or section 6. This comprises a temperahire-responsive device 37 positioned adjacent the discharge outlet oi the tubes in section (5, and connected by a flexible conduit 38 with a pressure-responsive device 39, which in turn is provided with an operating rod 40 connected with a lever 11 for operat ing member 17. The temperature-responsive device, conduit 3t; and pressure-responsive device 39 are filled with a suitable operating fluid which expands when heated and which moves the rod 4L0 against the action of a spring 42. The latter .is held under compres sion against the pressure-responsive device by fined abutments 13. Any other suitable means may be employed in connection with distributing or apportioning member 17 to provide an even or unitorm cooling water outlet temperature.

Referring now to Fig. 2, in which the relerence numerals are the same as used in Fig. 1 for the same parts, the interior of scc tion 7 is arranged to provide a mixing teed water heater having a spray nozzle as through which the cooling water is delivered into a mixing chamber to surrounding the nozzle adjacent the steam inlet 9. A series of battles 46 are suitably arranged in the easing to provide a storage oi? heated liquid, which is withdrawn as required through conduit 11 and from which vapors and non-condensible gases escape through openings l? in the battle plates and outlet conduit 10. With this arrangement the quantity of cooling water sprayed into section 6 may be varied to provide any desired condition of saturation therein and may be automatcially controlled by any suitable means after the manner of the arrangement shown in Figs. 1 and 3.

While the cooling water for the heat exchange device taken through inlet 15 may be supplied from any suitable source, for purposes ot' understanding the invention more fully, the cooling water supply conduit 19 which is connected with inlet 15 may be considered to be connected with a condenser hot well (not shown). Also outlets 11 oi both sections may be considered to be connected to a common condensate collecting means (not shown).

From the foregoing description, .it will be seen that the device in the present invention provides a heat exchange device which provides in one casing a combined condenser and feed water heater with means tor distributing or apportioning the cooling medium thereto in accordance with the supply oi heating medium, whereby a uniform outlet temperature of the cooling medium and a uniform loading of the cooling tubes in the heat exchange sections may be maintained.

While the invention has been illustrated and described in connection with a two-stage ejector pump, it should be understood that it is not limited thereto, but may be used with steam ejector pumps having more than two stages.

What I claim as new and desire to secure by Letters lli atent oi the United States, is:

l. in a heat exchange device of the condenser type havii'ig a plurality of separate heating sections, the combination oi means for supplying a heating medium to each of said sections separately, means for supplying cooling medium to said sections in parallel, and 2* common means for apportioning the coolii medium to said sections.

2. A. heat exchange device oil the con de ser type having a plurality of heating sections, means for supplying heating medium to said sections, means tor supplying cooling medium to said sections in parallel, said means including a chamber located between a pair of said heating sections, said chamber having a cooling medium inlet and a cooling medium outlet, and means for apportioning the cooling medium to said sections comprising a movable valve member located in said chamber.

A heat exchange device of the condenser type having a plurality of heating sections, means for supplying heating medium to said sections, means for supplying cooling medium to said sections in parallel, said means including a chamber located between apair of said heating sections, said chamber having a cooling medium inlet and a cooling medium outlet, means for appor tioning the cooling medium to said sections comprising a valve member located in said chamber, and means connected with the valve member tor automatically controlling the same in accordance with changes in a variable quantity allecting the outlet temperature of the cooling medium from said heat exchange device.

4-. A heat exchange device of the co11- denser type having a plurality of heating sections, means for supplying heating medium to said sections, means for supplying cooling medium to said sections in parallel, and means for apportioning the cooling medium to said sections in accordance with changes in the temperature of the cooling medium discharged from one oi said heating sections.

5. A heat exchange device comprising a pair of duplicate surface condensers and a cooling water chamber located in a common casing, said cooling water chamber being located between adjacent ends of said surface condensers and having a cooling water inlet and a cooling water outlet, a cooling water distributing member located in the cooling water chamber adjacent the cooling water inlet, said member being movable to vary the distribution of cooling water to said casing, said cooling water chamber bein eorface condensers and means for moving 52nd dlstrlbutlng member. 7

6. A ,heet exchange .devloecomprlsmg a ii of duplicate suriece condensers and a cooling Water chamber located in a common locefced. between adjacent ends of mid sur face condensers and haying a cooling Water inlec end 000 119; water outlet, a cooling r distril g member located in the were cha er adj nt ih cooling Water inlet, said member being moyable to very the distribution of cooling Water to said surface condensers, means for moving said distributing member, and a two-stage steam ejector air pump connected with said surface condenser sections to supply heating medium thereto.

In Witness wlzereof I have hereunto r r 9 r o my hand 1115 22nd day of October, 1926.

GUS AV P EL-