SU1612199A1 - Heat exchange apparatus - Google Patents

Abstract

The invention serves to cool sterile media and can be used in the microbiological, medical, and other industries. The heat exchanger contains a casing 1 with steam 2 and liquid 3 volumes and horizontal heat exchange pipes 4 and 5. Pipe 5 is enclosed by a screen 6 having an opening 7 and perforations 8. The hot coolant circulating through the pipe 5 heats the intermediate heat carrier. At the same time, the latter boils in the gap between the screen 6 and the pipe 5, leaves the opening 7 into the steam volume 2, where it condenses on the surface of the heat exchange pipe 4. 2 Cp. f-ly, 7 ill.

Description

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The invention relates to heat transfer i-iHiM devices, namely, heat exchangers for cooling sterile media, 4 can be used in microbiology, medical, and industrial sectors.

The purpose of the invention is to increase the heat transfer capacity.

FIG. 1 shows a heat exchange apna-, general view; in fig. 2 and 3 to section A-A of FIG. one; in fig. 4 is a section BB in FIG. one; Fta FIG. 5 shows an embodiment of the apparatus; in fig. 6 and 7 are section BB in FIG. five.

I Tag (a heat exchanger contains koh. -Ku I with a steam 2 m liquid 3 volumes L horizontal heat exchange pipes 4 and 5, Pipe 4 is placed in the steam volume 2, and pipe-5 - S liquid volume 3. Pipe 5 is covered with a gap the screen 6, which had the form of an open shell, between the edges of which there is an opening 7. The shell; 1Chia 6 is located with eccentricity relative to the pipe 5 and facing upward 7. At the bottom of the screen shell 6 there is a perforation 8. The screen shell 6 can be performed from individual parts C decreasing from part to part and diameter- It) OM along the coolant. In another variant, the screen shell b can be installed with a slope upwards along the heat carrier | el.

: The heat exchanger works as follows: 1, in its own way.

The hot coolant circulating yo from the heat exchanger tube 5 transfers heat to the intermediate coolant. The last kiit, o6pa30DaBujKHCH pairs in the form of bubbles DG1Izhets on the gap between the screen b and the lower pipe 5 to the opening 7. As you move, the volume of the pipes increases due to the supply of heat from the pipe 5. As the shield 6 shifts heat exchanger tube 5 increases in the direction of movement of the vapor bubble, eliminates "steaming of the gap;" the upper channel in its upper part and the complete evaporation of the liquid film between the bubble and the heat exchange surface. The intermediate coolant vapors are exhausted from opening 7 into vapor volume 2 and are condensed on the surface of the heat transfer plate 4, along which the heated coolant moves. In this case, the heat of condensation is the last. The intermediate coolant condensate flows into the liquid volume 3 and through the perforation 8 enters the HiHOBb in the gap between the heat exchange pipe 1 and the shell of the screen 6.

In the case when the shell 6 consists of several sections of skkh - parts, is minimal

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; the lyric of the slot channel in its lower part, formed by the first section along the hot coolant, is selected from the condition of the maximum possible heat transfer coefficient near the heat flux value corresponding to the onset of the boiling crisis at a temperature head corresponding to the temperature of the hot coolant at the entrance to the heat exchange pipe 5. With the flow of hot heat / its temperature gradually decreases. At some distance from the entrance there is a gap between the heat sink ennoy tube 5 and the screen shell 6 ceases maximum ssotpetstooiat

5 heat transfer coefficient. Therefore, the diameter of the next section of the shell decreases in accordance with the change in temperature tiano: pa, which provides the most favorable conditions for heat removal along the entire length of the tag | .; exchange pipe 5.

 The execution of a shell with a slope provides a more accurate follow-up of the change in the magnitude of the minimum width of the gap clearance to the change in the temperature head. The offset of the opening 7 relative to the vertical

The g axis of the cross section of the heat exchange tube 7 leads to a violation of symmetry on both sides of the heat transfer surface, which, due to the additional pulsation of the liquid, makes it possible to intensify the heat exchange during boiling in the gap channel. In addition, the offset of the slot provides the supply of a vapor-liquid mixture from the slotted channel not directly to the surface of the heat exchange pipe 4, but away from it. Therefore, the liquid phase is not; hits the condensation surface and not

Fi worsens the heat exchange conditions.

Claims (3)

1. A heat exchanger containing a casing with steam and liquid volumes and horizontal heat exchange tubes, one of which is located in the steam volume and the other in the liquid volume, the latter partially being covered to form. the screen gap in the enclosure of the closed-loop shell, 5 forming between the longitudinal edges of the aperture,, ogl / o yi tem. 2.Afuiapa i according to claim 1, characterized in that the screen shell is made of parts with a diameter decreasing from part to part along the coolant in the pipe. 3. An apparatus according to claim, characterized in that the shield of the screen is installed with a nack. uiol up along the coolant. 9g.1 five Fig.Z 6: J fpcfs  r-- - - v-.cj ..- J 4 |; Ax3bi .-- -. tu- - h. g --- td j .. .,.,; y, ...-.- o -... Zdl „A..l13ch ....: x.:; sjsi: y-.s  ), S i ii-v: -; ; -:; ®eJiir; v: 5; t - Ku .j ::: aui: jsffiii s; : - i -i;: 2.s: S  p or &; - v: i c.sjo m3F: s iissj-uji Si: -v i D W E5 2§ - nd TH5: | fei t: S35i: - -: r -: - l -., g / 1I  -; - ff 7 4 v fareijep-- - - I ..-. uitirvafiSl j i ,, r.-V., i-i, iiv-; five 1 --- - - .. JAx..C.; ..- j, - .. i, 5gi; s -6 - ;, 7; f ;. .V3; v-C.3-Jba “E lrg; t -: Bcr.-: .2ГС: Л1Тг5 & гай5 .Eb .-: -. г-S,.: 34: -j-: .rT7ni rrr te rii Y / y..G at - ,. “F 6 & .f