FI62185B - VAERMEVAEXLARE I ROERFORM - Google Patents

Description

I- - Γβ1 ANNOUNCEMENT _ ..

JttA ™ * 11 * UTLÄGGNINGSSKRIFT 62185 fgft c (4S) rat-Rttl ry: Jnrr: · .1y 10 11 1932 ^ ^ (S1) Kr.lk.3 / lnt.CI.3 F 28 D 3/02, 7 / 10 ENGLISH —EN N LAN D (21) P * wnttlh »k * mu · - PMMttaraeknlnc 801722 (22) H» k «ml * p * lvt - AiMBknlngadag 28.05.80 ^^ (23) AtkupUvi — Glltl |> i« tad «f 28.05.80 (41) Tulhit JtilklMkal— fellvlt offentllj 29] _] _

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'(44) NlhtavUuIpwion fa kuLfulkaltun pvm.— nitait- OCh registerstyrelsm AnaBfcU) utlagd od> utl.lkriftvn public Arad 30.07.82 (32) (33) (31) Pyydetty atuolkeut — Begird prlorltat (71) Oy W. Rosenlew Ab, FI 51 »28101 Pori 10, Finland-Finland (FI) (72) Arvi Rönnholm, Pori, Finland-Finland (FI) (7 ^) Oy Kolster Ab (5M Tubular heat exchanger - Värmeväxlare i rörform This invention relates to a tubular double heat exchanger with two The dual heat exchanger is biphasic with respect to the gaseous heat transfer medium and first conducts the gaseous heat transfer medium to the lower end of the tubular heat exchanger. located in the middle of the heat exchanger, from the outer heat exchanger both heat transfer and heat transfer a tubular heat exchanger separated with respect to the liquid to be heated, in which the liquid is heated by a residual part of a heat transfer medium led from the opposite end of the heat transfer medium inlet to lids, through the space of which the liquid to be heated flows through the pipes, while the jacket surrounding the two heat exchangers forms a whole connecting the heat exchanger.

2 62185

Various tube heat exchangers are known for heating liquids and have been described in the literature: 1. VDI-Wärmeatlas 1953 Cb4, Cb5, Cb6 2. R.C. Lord, P.E. Milton and R.P. Slusser,

Design of heat Exchangers.

Chemical Engineering (1970): 26 pp. 96-117 3. John H. Perry Heat-transfer Equipment

Chemical Engineering Handbook Section 11

Fourt Edition 1963 Mc Craw-Hill / Book Company, New York 4. John P. Fanaritis and James W. Bevevino Designing Shell - and-tube heat exchangers Chemical Engineering (1976): 5 pp. 62-71 In these tubular, heat-donating gaseous however, heat exchangers using a medium have disadvantages in connecting them to the gaseous medium in series when it is desired to heat even a different liquid in the sauna. Said series connections occur in practice in connection with various condensations and / or evaporations, in which case several completely separate heat exchangers have had to be used.

The invention relates to the development result of a known device, the purpose of which is to eliminate the above-mentioned drawback. The characteristic features of the device according to the invention appear from the characterizing part of claim 1. The device according to the invention has two centrally arranged tubular heat exchangers separated from each other both in terms of the heating medium and the liquid to be heated. It is also an object of the invention to provide a better distribution of the gaseous medium and a centralized removal of non-condensable gases so that the maximum possible heat transfer efficiency can be achieved while the space requirement is significantly reduced. It is essential in the invention that the connection of the heat transfer medium, which is preferably steam, is connected to a junction box at the lower end of the heat exchanger, which is connected to the space surrounding the outer tube heat exchanger to conduct heat 3 62185 from the opposite end of the heat transfer medium inlet to a space within which the parallel tubes of the outer tube heat exchanger tubes of the inner tube heat exchanger are connected to tube plates, the spaces after which are separated from the liquid tube of the outer tube heat exchanger.

The double heat exchanger according to the invention thus has only two tube plates, whereby the tube plates of the central heat exchanger can be separate, one outer jacket, one substantially pressure-free central tube inside the liquid side of the inner heat exchanger, an assembly connecting the entire heat exchanger unit.

The heat exchanger according to the invention further has the following advantages: a) Placing two heat exchangers with the same heat surface in one housing increases the diameter of the heat exchanger by only 35%.

b) Compared to the two separate surface condensers of the multi-stage evaporator (pre- and post-condenser), the diameter of the combined heat exchanger condenser increases by only 13%.

c) Due to the placement of the external post-heater of the multi-stage evaporator in the middle of the heater of the evaporator unit, the diameter of the combined post-heater increases by only 4%.

Although the diameters increase, the cross-sectional space requirement decreases by 9%, 2% and 5.5% in the above-mentioned cases, as well as the length in the transverse plane (devices in succession), i.e. 41%, 35% and 30%, respectively.

- There is only one pressurized jacket structure on the heating medium side, resulting in significant material savings.

- Different liquids can be heated separately in the same device.

- When the heating medium is steam, the two condensate fractions formed from it have been separated for later use.

- When the heating medium is steam, the condensate formed by the external heat exchanger 62185 4 is obtained in the form of heat, because the subcooling effect caused by the low concentration of non-condensable gases is small.

- The removal of non-condensable gases from the center of the innermost heat exchanger above its condensate surface ensures efficient access of the heating medium to all pipe surfaces. For this reason, the required heating surface in the entire heat exchanger can be reduced.

- Due to the turbulent steam flow at the lower end of the outer heat exchanger, the membrane condensation turns into droplet condensation, whereby heat transfer on this part of the heating surface becomes more efficient and boiling in the naturally circulating evaporator phase earlier.

Thanks to the more efficient heat transfer, the required heating surface can be reduced in this respect.

The invention will be described in more detail below with reference to the embodiment shown in schematic longitudinal section in the accompanying drawing.

In the drawing, reference numeral 1 denotes a cylindrical jacket with ends 2 and 3 with inlet and outlet connections 4 and 5 for the medium to be heated, which flows in the direction indicated by the arrows in the outer part of the heat exchanger. Two pipe plates 6 and 7 are arranged in the jacket 1, to which a number of pipes 8 are attached in any advantageous manner, e.g. by mangling. These tubes form the thermal surface of the outer heat exchanger, through which tubes the heating medium flows in them. In the space delimited by the cylindrical jacket 1 and the tubular plates 6 and 7, a second tubular heat exchanger with cylindrical jacks 9 and 10 with ends 11 and 12 is arranged in the middle thereof. These separate the liquid sides of the heated medium of the inner and outer heat exchangers.

The sheaths 9 and 10 with their ends 11 and 12 are attached to the tube plates 6 and 7. The sheaths 9 and 10 are fitted with tube plates 13 and 14, which are preferably detached from the tube plates 6 and 7, and to which a plurality of tubes 15 are attached in any manner known per se. These tubes form the thermal surface of the inner heat exchanger.

Arranged around the tubes 15 of the inner heat exchanger is a cylindrical tube 16 open at its upper end, coincident with the tube plates 13 and 14, which is attached at its lower end to the jacket 9. The upper end of the tube 16 is connected to the outer heat exchanger tube 8 by an annular gap 17 with the medium flow space, which allows the remainder of the heating medium to be led to the heating medium flow space surrounding the tubes 15 of the central heat exchanger. The tubular jacket 16 otherwise separates the outer and inner heat exchangers with respect to the flow conditions of the heating medium.

The drawing shows a connection 19 of a heating medium, preferably of steam, connected to the junction box 18 in the jacket 1, which is connected to the space surrounding the outer heat exchanger tubes 8 by means of an annular gap 20, the reference numeral 21 denoting the outer heat exchanger tube 6 a condensate discharge line for the heating medium and a condensate discharge line for the remainder of the heating medium from the space between the tube plates 13, 14 and the tubular jacket 16 of the inner heat exchanger.

Reference numeral 23 denotes the inlet line of the heated medium connected to the space delimited by the end 11 of the innermost heat exchanger, through which the medium to be heated flows through the pipes 15 to the space delimited by the end 12 from where it exits via the outlet line 24.

Reference numeral 25 denotes a non-condensable gas outlet line connected through a tubular jacket 16 to the space of the heating medium surrounding the tubes 15 above the condensate surface formed in the heat exchanger above the tube plate 13.

In the heat exchanger according to the invention, each heat exchanger therein can also be divided by partitions into compartments in spaces bounded by ends 2,3 and 11,12 which separate the liquid sides of the inner and outer heat exchanger to be heated so that the desired part of the partitions 8,15 enters the partition area. in them, the medium to be heated can be led as it flows back through one compartment back through the other compartment, whereby the substance to be heated is continuously heated and both the outer and inner heat exchangers on the liquid side become multi-stage. Likewise, the non-condensable gas outlet line 25 can pass

Claims (4)

6 62185 in the middle of the space formed by the pipes 15 through the jacket 10 and the end 3 of the pipe plate 14, the beginning of the outlet line being above the condensate surface formed above the pipe plate 13. A two-stage heat exchanger for a gaseous heat transfer medium, wherein the gaseous heat transfer medium is first passed to the lower end of a tubular heat exchanger forming an outer heat exchanger in which the liquid to be heated flows through tubes arranged in two tube plates (6,7), characterized in that that the second heat exchanger is a tubular heat exchanger arranged in the middle of the outer heat exchanger, separated from the outer heat exchanger with respect to the heat transfer medium and the liquid to be heated, and heating the liquid with a residual portion of from the opposite end, the ends of the tubes of the inner heat exchanger being arranged in two tube plates (13,14), the space after which is limited by the lids (11,12) through which the heated Nest that flows through the pipes while the jacket (1) surrounding both heat exchangers forms a whole connecting the heat exchanger. Heat exchanger according to Claim 1, characterized in that the condensate is removed from the innermost heat exchanger separately while the non-condensable gases are removed above this condensate surface. Heat exchanger according to Claim 1, characterized in that both the outer and inner heat exchangers on the liquid side are single-stage or multi-stage. Heat exchanger according to Claim 1, characterized in that the tube plates of the inner heat exchanger are detached from the tube plates of the outer heat exchanger.