Welded plate shell type condenser

Abstract

A welded plate shell type condenser comprises a heat exchange plate bundle formed by stacking corrugated plates, process medium pipe boxes are installed at inlets and outlets of upper and lower runners of the welded plate shell type condenser, cooling medium pipe boxes are installed at inlets and outlets of side runners of the welded plate shell type condenser, a pressing plate is arranged on the outer side of the heat exchange plate bundle, and the pressing plate clamps and fixes the heat exchange plate bundle through clamping studs. A convex edge is arranged on one side of each corrugated plate, every two corrugated plates are stacked to form a heat exchange unit, the convex edges of every two adjacent heat exchange units make contact with each other to form a process medium flow channel and a non-condensable flow channel, the multiple heat exchange units are stacked to form heat exchange plate bundles, and the heat exchange plate bundles are arranged up and down. The process medium sides of the heat exchange plate bundles which are arranged up and down are communicated through a middle tube box; a partition plate is arranged in the middle tube box; and a non-condensable gas outlet is formed in the non-condensable gas side of the middle tube box. The utility model overcomes the defects of difficulty in balancing pressure drop and flow velocity on two sides, incomplete separation of non-condensable gas, incapability of cleaning and maintaining a cooling medium side and the like in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger design and manufacturing, in particular to a welded plate-shell condenser. Background Art

[0002] The condenser is an important equipment in the chemical production process. Its function is usually to condense the gas phase process materials into the liquid phase through cooling media such as circulating water, so as to achieve the separation and purification of the materials. The most common equipment form is the shell and tube condenser, but due to its disadvantages such as low heat transfer efficiency, large space occupation, and high metal consumption, it has been gradually replaced by welded plate condensers in some workstations. The patent "A welded plate condenser that can eliminate non-condensable gas (ZL202123094864.9)" solves the problems of low heat transfer efficiency and large space occupation of shell and tube condensers to a certain extent. However, since the flow length of the media on both sides is the same, it is difficult to simultaneously meet the requirements of small pressure drop on the process medium side and high flow rate on the cooling medium side. In addition, in one embodiment, since the non-condensable gas pipe is connected to the condensate outlet pipe box and there is no separation device, there may be a situation where liquid droplets are entrained in the non-condensable gas; in another embodiment, although the non-condensable gas is further separated by the plate, the non-condensable gas needs to pass through the entire plate bundle that is equal to the condensation path. The separation path is long, which is not conducive to controlling the pressure drop. In addition, since the cooling medium side is a fully welded structure, the heat exchange plate bundle cannot be mechanically cleaned or repaired when the flow channel is blocked or leaking. These shortcomings have imposed certain restrictions on its application scenarios. Utility Model Content

[0003] The utility model provides a welded plate and shell condenser to solve the problems of the existing plate condenser that it is difficult to balance the pressure drop of the process medium and the flow rate of the cooling medium, the droplet separation in the non-condensable gas is not complete, the non-condensable gas flow distance is too long, and the plate bundle cannot be cleaned and maintained.

[0004] The technical solution adopted by the utility model is:

[0005] A welded plate and shell condenser comprises a heat exchange plate bundle formed by stacking corrugated plates, the heat exchange plate bundle having flow channels for mutual heat exchange, process medium pipe boxes are installed at the inlet and outlet of the upper and lower flow channels, and cooling medium pipe boxes are installed at the inlet and outlet of the side flow channels, a pressure plate is provided on the outside of the heat exchange plate bundle, the pressure plate clamps and fixes the heat exchange plate bundle by clamping studs, a convex edge is provided on one side of the corrugated plate, two corrugated plates are stacked on each other to form a heat exchange unit, the convex edges of adjacent heat exchange units contact each other to form a process medium flow channel and a non-condensable gas flow channel, a plurality of heat exchange units are stacked on each other to form a heat exchange plate bundle, the heat exchange plate bundle is arranged up and down, and the number of heat exchange plate bundles is not less than 2 groups, the process medium sides of the upper and lower heat exchange plate bundles are connected through an intermediate pipe box; a partition is provided in the intermediate pipe box; and a non-condensable gas outlet is opened on the non-condensable gas side of the intermediate pipe box.

[0006] The cooling medium pipe boxes on one side of the upper and lower heat exchange plate bundles are connected through an intermediate pipe.

[0007] The cooling medium flows in from the lowermost heat exchange plate bundle and flows out from the uppermost heat exchange plate bundle.

[0008] The cooling medium pipe boxes on one side of the upper and lower heat exchange plate bundles are independent of each other.

[0009] The cooling medium pipe box is detachably connected.

[0010] The intermediate pipe box is provided with a manhole.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the flow path of the process medium in the plate bundle is shorter, and the cooling medium flows in series in multiple plate bundles, which can simultaneously meet the requirements of small pressure drop on the process medium side and high flow rate on the cooling medium side; multiple cooling media with different temperatures can be used in different plate bundles, which is beneficial to small temperature difference heat exchange; some plates also serve as separators, which have a secondary separation effect on droplets in non-condensable gas, and the flow path is moderate; the cooling medium pipe box is detachable, and the middle pipe box is provided with a manhole, so that the heat exchange plate bundle can be cleaned and repaired. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is the structural section view and medium flow diagram of the utility model;

[0014] Figure 3 This is a schematic diagram of the stacking of heat exchange plates of the utility model;

[0015] In the figure: 1. process medium upper pipe box; 101. process medium inlet; 2. pressure plate; 3. cooling medium pipe box; 4. intermediate pipe box; 401. non-condensable gas outlet; 402. manhole; 403. partition; 5. process medium lower pipe box; 501. process medium outlet; 6. intermediate connecting pipe; 7. clamping stud; 8a. upper heat exchange plate bundle; 8b. lower heat exchange plate bundle; 9. corrugated plate; 10. convex edge; 11. cooling medium flow channel; 12a. process medium flow channel; 12b. non-condensable gas flow channel; A. process medium; B. non-condensable gas; C. cooling medium. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0017] like Figure 1 , Figure 2 , Figure 3As shown, a welded plate-shell condenser comprises a heat exchange plate bundle formed by stacking corrugated plates, the heat exchange plate bundle has flow channels for mutual heat exchange, process medium pipe boxes are installed at the inlet and outlet of the upper and lower flow channels, and cooling medium pipe boxes are installed at the inlet and outlet of the side flow channels, a pressing plate is provided on the outside of the heat exchange plate bundle, and the pressing plate is clamped and fixed to the heat exchange plate bundle by clamping studs, a convex edge 10 is provided on one side of the corrugated plate sheet 9, and two corrugated plates are stacked on each other to form a heat exchange unit, The convex edges 10 of adjacent heat exchange units contact each other to form a process medium flow channel 12a and a non-condensable gas flow channel 12b. Several heat exchange units are stacked on each other to form a heat exchange plate bundle, which is arranged up and down, and the number of heat exchange plate bundles is not less than 2 groups. The process medium sides of the upper and lower heat exchange plate bundles are connected through an intermediate pipe box 4; a partition 403 for separating the process medium and non-condensable gas is provided in the intermediate pipe box 4; and a non-condensable gas outlet 401 is provided on the non-condensable gas side of the intermediate pipe box 4.

[0018] When there are two heat exchange plate bundles, they mainly include an upper heat exchange plate bundle 8a, a lower heat exchange plate bundle 8b, an upper process medium pipe box 1, a lower process medium pipe box 5, an intermediate pipe box 4 and a cooling medium pipe box 3. A pressing plate 2 is provided on the outside of each heat exchange plate bundle, and the pressing plate is clamped and fixed to the heat exchange plate bundle by clamping studs 7.

[0019] The number of heat exchange plate bundles in series can be increased according to the difficulty of heat exchange. The process medium upper pipe box 1 is installed at the upper end of the uppermost heat exchange plate bundle, and the process medium lower pipe box 5 is installed at the lower end of the lowermost heat exchange plate bundle. The heat exchange plate bundles are connected through the intermediate pipe box 4. The lowest intermediate pipe box is provided with a partition 403 for separating the process medium A and the non-condensable gas B. This partition separates the intermediate pipe box into a mutually independent process medium chamber and a non-condensable gas chamber. A non-condensable gas outlet 401 is provided on one side of the non-condensable gas chamber, and a manhole 402 is provided on one side of the process medium chamber. In this embodiment, the number of heat exchange plate bundles is 2.

[0020] The cooling medium pipe boxes 3 on one side of the upper and lower heat exchange plate bundles are connected through the intermediate pipe 6. Removable cooling medium pipe boxes 3 are installed on the left and right sides of each heat exchange plate bundle, and the cooling medium pipe boxes on different layers are connected through the intermediate pipe so that the cooling medium passes through each heat exchange plate bundle in turn, that is, the cooling medium flows in from the heat exchange plate bundle at the lower end and flows out from the heat exchange plate bundle at the upper end.

[0021] In another embodiment, the intermediate pipe 6 can be eliminated, so that the cooling medium pipe boxes 3 on one side of the upper and lower heat exchange plate bundles are independent of each other, so that two cooling media with different temperatures are respectively passed through the upper heat exchange plate bundle 8a and the lower heat exchange plate bundle 8b to maintain a suitable logarithmic mean temperature difference, so as to make the equipment cost as economical as possible while achieving a better condensation effect.

[0022] The cooling medium pipe box 3 is a detachable connection. When the flow channel is blocked or leaking, the cooling medium pipe box 3 can be removed to enter the interior of the equipment to clean and repair the heat exchange plate bundle.

[0023] The intermediate pipe box 4 is provided with a manhole 402. When the flow channel is blocked or leaks, the inside of the equipment is entered through the manhole 402 to clean and repair the heat exchange plate bundle.

[0024] In order to make the process medium A and the cooling medium C flow in a countercurrent manner with a better heat exchange effect, the cooling medium flows in from the lowermost heat exchange plate bundle and flows out from the uppermost heat exchange plate bundle. That is, the cooling medium should first enter the lower heat exchange plate bundle 8b, exchange heat with the non-condensable gas and the process medium respectively, and then enter the upper heat exchange plate bundle 8a through the intermediate pipe 6 to exchange heat with the process medium again.

[0025] The process flow of this embodiment is as follows: the process medium A enters the process medium flow channel 12a and the non-condensable flow channel 12b of the upper heat exchange plate bundle 8a from the process medium inlet 101 through the process medium upper tube box 1, and after heat exchange with the cooling medium C, enters the process medium flow channel 12a of the lower heat exchange plate bundle 8b through the process medium cavity of the intermediate tube box 4, and exchanges heat with the cooling medium C here. The condensed condensate is discharged through the condensate outlet 501 below the process medium lower tube box 5. The non-condensable gas B that is not completely condensed enters the non-condensable flow channel 12b of the lower heat exchange plate bundle 8b, and exchanges heat with the cooling medium C again here. On the one hand, the non-condensable gas can be condensed twice, and on the other hand, the droplets entrained in the non-condensable gas can be further separated by the corrugated plate. The separated condensate enters the process medium lower tube box 5 under the action of gravity and is discharged through the condensate outlet 501. The separated non-condensable gas enters the non-condensable gas cavity of the intermediate tube box 4 and is discharged from the non-condensable gas outlet 401.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A welded plate-shell condenser, comprising a heat exchange plate bundle formed by stacking corrugated plates, the heat exchange plate bundle having flow channels for mutual heat exchange, process medium pipe boxes installed at the inlet and outlet of the upper and lower flow channels, cooling medium pipe boxes installed at the inlet and outlet of the side flow channels, a pressing plate is provided on the outside of the heat exchange plate bundle, the pressing plate is clamped and fixed to the heat exchange plate bundle by clamping studs, characterized in that: A convex edge (10) is provided on one side of the corrugated plate (9); two corrugated plate sheets are stacked together to form a heat exchange unit; the convex edges (10) of adjacent heat exchange units contact each other to form a process medium flow channel (12a) and a non-condensable gas flow channel (12b); a plurality of heat exchange units are stacked together to form a heat exchange plate bundle; the heat exchange plate bundle is arranged in an upper and lower manner, and the number of heat exchange plate bundles is not less than 2 groups; the process medium sides of the heat exchange plate bundles arranged in the upper and lower directions are connected through an intermediate pipe box (4); a partition plate (403) is provided in the intermediate pipe box (4); and a non-condensable gas outlet (401) is provided on the non-condensable gas side of the intermediate pipe box (4).

2. A welded plate and shell condenser according to claim 1, characterized in that: The cooling medium pipe boxes (3) on one side of the upper and lower heat exchange plate bundles are connected via an intermediate pipe (6).

3. A welded plate and shell condenser according to claim 2, characterized in that: The cooling medium flows in from the lowermost heat exchange plate bundle and flows out from the uppermost heat exchange plate bundle.

4. A welded plate and shell condenser according to claim 1, characterized in that: The cooling medium pipe boxes (3) on one side of the upper and lower arranged heat exchange plate bundles are independent of each other.

5. A welded plate and shell condenser according to claim 2 or 4, characterized in that: The cooling medium pipe box (3) is detachably connected.

6. A welded plate and shell condenser according to claim 1, characterized in that: The intermediate pipe box (4) is provided with a manhole (402).

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