DD291828A5 - TUBE BELT WASHER WITH CROSS BZW. SPIRAL TOP REPLACEMENT TUBES - Google Patents

Abstract

The invention relates to a Rohrbuendelwaermeuebertrager with transverse or spiral-ribbed exchange tubes for heat exchange processes gas-liquid, in which the shell space divided by transverse or spiral flow and thereby radial gas inlet and / or outlet gas outlet are provided in Gehaeusemantel for the inlet and outlet chamber. According to the invention, one or more of the finned replacement tubes in the region of the gas inlet and / or gas outlet nozzle, approximately corresponding to the width of the inlet or outlet chamber only as a core tube without ribbing of this or these replacement tubes, preferably also pass through the adjacent transverse - Or spiral wall of the inlet and outlet chamber erfaszt. Fig. 1 {Rohrbuendelwaermeuebertrager; Ringstromwaermeuebertrager; Stroemungsgaenge; Waermeaustauschprozesse; Exchange tubes; Inlet chamber; Exit chamber; ribbing; Core tube; Ring current lanes; Spiral power alleys}

Description

Field of application of the invention

The invention relates to a shell and tube heat exchanger with transverse or spiral-ribbed exchange tubes for heat exchange processes gas-liquid, in which the shell space is divided by means of transverse or Spiraiwänden in-bore flow passages, such as Ringirom- or Spiralstromgassen and thereby radial Gasein- and / or Gas outlet are provided in the housing shell for the inlet and outlet chamber.

These tube bundle heat exchangers are used for a variety of waste heat processes in chemical plant engineering and energy technology applications, but in particular for gas compressor plants for recovering the heat of compression or for large-scale absorption refrigeration plants for cooling recovery.

Characteristic of the known state of the art

According to DD-PS 239853 a heat exchanger with a central tube is known, the ring-shaped annular track stages formed by annular disc-shaped partitions are formed in the annular space, wherein the shell-side medium inlet and outlet takes place via disposed in the housing shell radial inlet and outlet nozzle. The transition of the jacket space medium from annular disc to annular disc is carried out by Schrägströmkammern which are limited by arranged in the central tube parallel inclined plates.

These heat exchangers have the disadvantage that in the inlet and outlet chamber no optimal uniform flow over the chamber width for the nuer- or spiral-ribbed exchange tubes is given because the transverse rib prevents the axial expansion of the gas flow to the entire chamber width and even with narrow chambers due to the circular cross-section necessarily in the middle of the largest flow flow is present, the edge regions are neglected in terms of flow. This reduces the heat exchange effect infoi.ie formation of not effectively flowed areas, which can be up to 10% in orders of magnitude. In addition, both the inlet and the outlet due to the adjustment due to Querberippung it comes to unwanted backwater effects that increase the pressure drop of the apparatus and thus adversely affect the energy balance of the apparatus.

Furthermore, according to DD-PS 207757 a device for generating a helical flow in heat exchangers is known in which a created by special guide helical lane is flowed through by means of radial nozzle in the housing shell.

In this embodiment, the o.g. Disadvantages also fully effective.

In addition, it is known, especially in finned tube bundles with alternating transverse baffle arrangement, z. B. DD-PS 248418, the tube bundle strip-shaped center in the housing shell with upper and lower virgin areas.

Although this solution avoids backflow effects in the inlet and outlet areas and also ensures full media loading of the replacement pipes in the axial chamber width, however, only a small exchange surface is necessarily to be arranged in these apparatuses, which considerably reduces the degree of cohesion.

Object of the invention

The object of the invention is to provide a shell and tube heat exchanger with transversely or spirally ribbed Austruschrohren for heat exchange processes gas-liquid mti Ringstrom- or spiral flow alleys and radial supply or discharge pipe to housing shell, the high heat exchange effects, low energy consumption of the apparatus and a large Compactness and thus low space requirement in the system guaranteed.

Explanation of the essence of the invention

The invention is based on the technical problem of a tube bundle heat exchanger with transverse or spiral-ribbed exchange tubes for heat exchange processes gas-liquid, in which the jacket space is divided by means of Quor- or spiral walls in bored flow passages such as Ringstrom- or spiral flow alleys and radial gas inlet and / or gas outlet nozzle in the housing casing are provided for the inlet and outlet chambers, and thereby ensure optimum flow of the exchange tubes in the inlet and outlet chamber, and low pressure losses achieved by avoiding backflow effects in the inlet and outlet chamber and thereby a large exchange area d. H. accommodates many replacement tubes in the apparatus housing, so that the apparatuses are compact. According to the invention the technical object is achieved in that in the region of the gas inlet and / or the gas outlet nozzle, approximately the width of the inlet and outlet chamber according to one or more of the ribbed exchange tubes is designed only as a core tube without ribbing or, wherein the fended ibende Berippung this or this exchange tubes preferably still the passage through the adjacent transverse or spiral wall of the inlet and outlet chamber detected. The advantages of the invention are due to the following main effects:

- Higher heat exchange effects through optimal flow of the inlet and outlet chamber in orders of magnitude up to 10% increase.

- Reduction of the pressure loss by avoiding the backpressure effects in the inlet and outlet chamber.

Achieving high heat exchange performance by ensuring large heat exchange surfaces in compact equipment with a small footprint in the plant.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. Show

Fig. 1: a tube bundle heat exchanger according to the invention in cross section

2 shows section A-A according to FIG. 1

3: Section B-B of FIG. 1

4 shows section C-C of FIG. 1.

The tube bundle heat exchanger according to the invention of FIG. 1 is designed with a floating head 1, fluid side prechamber 2, a tube bundle 3, equipped with axially transversely or spirally ribbed exchange tubes 4 in a fully annulus annulus 5 to a mutually closed central tube 6. In the annular space 5 annular disc-shaped transverse walls 7 are arranged for subdivision into four annular track chambers 8.

In the housing jacket 9, on the one hand, the radial gas supply nozzle 10 is arranged on the inlet chamber 11, and on the other hand, the radial gas discharge nozzle 12 is arranged on the outlet chamber 13. In the area of the gas supply or gas discharge connection 10,12 are approximately the width of the inlet and outlet chamber 11,13 corresponding to a plurality of axially transverse or spiral-ribbed exchange tubes 4 without ribbing 14 formed as a core tube 15. In the inlet chamber 11 of FIG. 2, the six exchange tubes 4, in the outlet chamber 13 of Figure 4 are two exchange tubes 4 without ribbing 14 executed. The remaining ribbing 14 of these replacement tubes 4 penetrates the passage 16 in the transverse wall 7 to the inlet and outlet chamber 11,13.

3 shows a middle ring track chamber 8 in the overcurrent region in operation is over dor. Gas supply pipe 10, the gas stream passed into the inlet chamber 11, where it spreads fully across the chamber width of tube sheet 1 / to the transverse wall 7 axially and the transverse or spiral-ribbed exchange tubes 4 in the parallel annular path passing flows in full.

The gas stream then enters the central tube 6 radially, flows axially to the next annular path chamber 8, leaves the central tube 6 and flows in full the exchange tubes 4 in this annular path chamber 8. After passing the other

Ringbahnkammern 8 and passage into the gas outlet chamber 13, the gas flow passes through this outlet chamber 13 to the end of the ribbed exchange tubes 4 and then flows from the tube plate 17 and the transverse wall 7 in the free passage of the core tubes 15 axially towards each other and leaves the apparatus via the radial gas discharge nozzle 12th ,

For pulsating gas supply z. As in the context of gas coolers in compressor systems, should, as shown in the embodiment, in the inlet chamber 11 for smoothing the gas flow more exchange tubes 4 are performed without ribbing 14 as in the outlet chamber thirteenth

To ensure the replacement of replacement tubes 4, regardless of which side of the tube bundle 3 - to the floating head 1 and the prechamber 2 out-detects the remaining ribbing 14 nor the passage 16 through the transverse wall 7 of the inlet and outlet chamber 11,13. In securing the interchangeability of replacement tubes 4 in the opposite direction of the lack of ribbing 14, it is also possible to restrict the passage 16 in the transverse wall 7 of the inlet and outlet chamber 11,13 to the diameter of the core tube 15.

Claims (2)

Tube bundle heat exchanger with transverse or spiral-ribbed exchange tubes for heat exchange processes gas-liquid, in which the jacket space is divided by means of transverse or spiral walls in flowed flow passages and radial Gasein- and / or gas outlet nozzle are provided in the housing shell, optionally with at least one side closed central tube with therein angeoroneten Gasüberdritten between the flow passages or a central core body is provided and the Strömunysgassen are formed as a ring or spiral flow alleys, characterized in that in the region of the gas inlet and / or the gas outlet nozzle (10,12), approximately the width of the input or Corresponding to outlet chamber (11,13), one or more of the ribbed exchange tubes (4) is designed as a core tube (15) without ribbing (14) or are, the remaining ribbing (14) of this or these replacement tubes (4) preferably still the passage (16) by the adjoin de transverse or spiral wall (7) of the inlet and outlet chamber (11,13) detected. For this 2 pages drawings