CN86200767U - Sleeve type condensing evaporator - Google Patents

Abstract

The utility model belongs to low-temperature technology and chemical technology, and is an improvement of the existing tubular condensation evaporator. Changing from a single-layer smooth tube to an enhanced double-layer casing greatly improves the heat transfer efficiency, thereby reducing the size of the entire condensing evaporator; when used in an air separation device, the temperature difference can be reduced to below 1.8K. The cost of the sleeve-type condensing evaporator is significantly lower than that of the existing sheet-type condensing evaporator, and it is applicable to various large, medium and small mixed gas separation devices, and can be produced by various large, medium and small manufacturers. Due to the reduction of the temperature difference, the power consumption of the whole device is significantly lower than that of the existing tube-type and sheet-type condensing evaporators.

Description

The utility model belongs to low-temperature technology and chemical technology, and can be used for air separation devices and other mixed gas separation devices.

There are condensing evaporators in general air separation devices and other mixed gas separation devices. At present, there are two types of condensing evaporators actually used: tube type and plate type. The efficiency of the tube type is very low, and the plate type is expensive and difficult to apply to small equipment. The utility model is an improvement of the existing tubular condensation evaporator. Some single-layer smooth tubes are used in existing tube-type condensing evaporators, and the efficiency is relatively low. Please refer to the middle volume of "Refrigeration and Low-Temperature Technology", pages 117-118, published by Mechanical Industry Press in 1981.

The purpose of the utility model is to improve the efficiency of the condensing evaporator, reduce its cost, and be applicable to various large, medium and small equipments.

The shell of the utility model is generally cylindrical, but the upper part is relatively thick, and the two ends are convex (Fig. 1). Four flower plates 7, 6, 5, 8 perpendicular to the center line are fixed in the shell, and the space in the shell is divided into five parts in turn: top cavity 17, upper cavity 16, middle cavity 20, lower cavity 18 and Bottom chamber 19. There is a circular hole in the center of the upper flower plate 6, and a central tube 11 is arranged in the center of the middle cavity, and its upper end is welded on the edge of the central circular hole of the upper flower plate 6, so that the space in the central tube communicates with the upper cavity, and the center The lower end of the tube is fixed on the lower flower plate 5, but the space in the center tube is not communicated with the lower cavity, but leads to the outside of the shell by a thin tube 23. There are many casing pipes 25 parallel to the center pipe in the cavity, and the casing pipes are composed of two inner and outer pipes that are sheathed together (Fig. 2). There are many small round holes on the corresponding positions of the flower board 6 and the flower board 5, and the upper and lower ends of each outer tube just pass through a small round hole on the flower board 6 and a small round hole on the flower board 5 respectively. (Fig. 2), and welded together with the flower boards 6 and 5 respectively, so that the space between the outer tube 21 and the inner tube 22 communicates with the upper chamber and the lower chamber, and there are some on the top flower board 7 and the bottom flower board 8 Smaller round holes, the upper and lower ends of each inner tube just pass through a small round hole on the flower plate 7 and a small round hole on the flower plate 8 (Figure 2), and connect with the flower plates 7 and 8 welded together so that the space in the inner tube communicates with the top cavity and the bottom cavity. Some stuffing is placed in the upper cavity. On the shell of the present utility model, some pipeline openings also lead to the inside. Six of them are drawn in Fig. Lower chamber and bottom chamber.

When used in an air separation device, the working conditions of the utility model are as follows: the nitrogen in the lower tower enters the middle cavity and the top cavity through the pipelines 9 and 10 respectively, and the part that enters the top cavity enters the inner tube again, and the two parts of nitrogen enter the outer tube respectively. Condensate on the outer surface 3 of the inner tube and the inner surface 4 of the inner tube, and the condensed liquid nitrogen is sent to the upper tower and the lower tower through pipelines 12 and 13 respectively. Liquid oxygen flows out of the upper tower, enters the lower chamber through the pipeline 14, and then enters the space between the outer tube and the inner tube and boils. The oxygen produced enters the upper chamber together with some liquid droplets. 15 flows out, and the liquid drops fall into the bottom of the central tube, and part of the liquid oxygen is extracted through the thin tube 23 by a liquid pump and then sent to the liquid oxygen circulation system.

The utility model has the advantages of high heat transfer rate, low cost, compact volume, and reduces power consumption of the entire gas separation device.

Compared with the single tube and plate type, the heat transfer rate of the utility model is higher due to the casing type; if the heat transfer surfaces 3 and 4 are properly strengthened, the heat transfer rate is higher. Due to the improvement of heat transfer rate, the temperature difference can be reduced (less than 1.8K in the air separation device), thereby reducing the pressure of the lower tower and reducing the power consumption of the whole device. Compared with the existing plate-type condensing evaporator, the cost of the utility model is significantly lower, and it can be used in high-pressure devices. In addition to being used for air separation devices, the utility model can also be used for natural gas separation, utilization of synthetic ammonia tail gas, petroleum gas separation and refrigeration devices, etc.

BRIEF DESCRIPTION OF THE DRAWINGS, Fig. 1 is an overall schematic diagram of the utility model, in which the dotted line 25 represents the casing. Figure 2 is a schematic diagram of a single casing. In the accompanying drawings, 1 is the inner surface of the outer tube, 2 is the outer surface of the inner tube, 3 is the outer surface of the outer tube, 4 is the inner surface of the inner tube, 5 is the lower flower plate, 6 is the upper flower plate, 7 is the top flower plate, 8 9 is the entrance of the middle chamber, 10 is the mouth of the top chamber, 11 is the center pipe, 12 is the outlet of the middle chamber, 13 is the mouth of the bottom chamber, 14 is the mouth of the lower chamber, 15 is the mouth of the upper chamber, and 16 is the upper chamber , 17 is the top chamber, 18 is the lower chamber, 19 is the bottom chamber, 20 is the middle chamber, 21 is an outer tube, 22 is an inner tube, 23 is a thin tube, 24 is a filler, and 25 is a casing.

The material of making the utility model can be red copper and brass, or aluminum alloy. The outer surface 3 of the outer tube and the inner surface 4 of the inner tube can be drawn with some grooves or welded with some metal strips (parallel to the center line) to improve the heat transfer rate; the inner surface 1 of the outer tube and the outer surface 2 of the inner tube can be is a porous heat transfer surface. The filler can be copper wire or Raschig ring.

Claims (3)

1, a kind of condenser/evaporator, its shell is roughly cylindrical, top is thicker, the two ends evagination, it is characterized in that having in the shell poppyhead plate (7), upper face plate (6), lower face plate (5) and end card (8) successively the inner space to be separated into top chamber (17), epicoele (16), lumen (20), cavity of resorption (18) and chamber, the end five parts such as (19), a circular hole is arranged in the central authorities of upper face plate (6) perpendicular to center line.There is a central tube (11) in central authorities at lumen (20), the edge joint weld of the central circular hole of the same upper face plate in upper end (6) of central tube (11) is connected together, the same epicoele in inner space (16) of central tube (11) is communicated with, the lower end of central tube (11) is fixed on the lower face plate (5), but does not lead to cavity of resorption (18) inner space of central tube (11), but lead to the outside of shell by a tubule (23), many sleeve pipes (25) that are parallel to central tube (11) are arranged in lumen (20), sleeve pipe (25) is made of outer tube that is nested together (21) and interior pipe (22), on the relevant position of upper face plate (6) and lower face plate (5), many small sircle holes are arranged, on the outer tube (21), following two ends are just passed a small sircle hole on the upper face plate (6) and a small sircle hole on the lower face plate (5) respectively, and same respectively upper face plate (6) and lower face plate (5) weld together, on the relevant position of poppyhead plate (7) and end card (8), some littler circular holes are arranged, on the interior pipe (22), following two ends are just passed a small sircle hole on the poppyhead plate (7) and a small sircle hole on the end card (8) respectively, and weld together with poppyhead plate (7) and end card (8) respectively.

2,, it is characterized in that the bonding jumper (being parallel to center line) that some grooves of pulling out is arranged or burn-on on the inner surface (4) of the outer surface (3) of outer tube and interior pipe according to the described condenser/evaporator of claim 1.

3,, it is characterized in that the inner surface (1) of outer tube and the outer surface (2) of interior pipe are the porous heat-transfer areas according to claim 1 or 2 described condenser/evaporators.

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