CN210718772U - Double flow double shell side full countercurrent heat exchanger - Google Patents

Abstract

The utility model discloses a double strand flow double shell side full countercurrent flow heat exchanger mainly includes casing, heat exchange tube, half bow-shaped baffling board, tube sheet, pipe case, tube side branch journey baffle, shell side fluid import and export takeover, first strand tube side fluid import and export takeover and second strand tube side fluid import and export takeover, its characterized in that: a shell pass partition plate is arranged in the shell and is vertically welded with the tube plate at one end, keeps a certain distance with the tube plate at the other end and keeps sealing with the shell; tube pass partition plates are arranged in the tube boxes at two ends to divide the tube boxes and the heat exchange tube bundles into a first tube pass and a second tube pass, and each tube box is provided with a tube pass fluid inlet-outlet connecting tube; the shell pass partition plate and the tube pass partition plate are in the same plane. The utility model discloses a two shell sides of shell side fluid flow, realize complete countercurrent flow heat with two strands of tube side fluids to the whole heat exchange efficiency of heat exchanger has been improved.

Description

Double flow double shell side full countercurrent heat exchanger

technical field

The utility model relates to the technical field of heat exchangers, in particular to a double-flow double-shell-pass full countercurrent heat exchanger.

Background technique

Heat exchanger is an important industrial equipment that realizes heat transfer of cold and hot fluids, and is used in various process industries. Common heat exchangers generally only have two kinds of fluids for heat exchange. If there are three or more fluids for heat exchange at the same time, multiple heat exchangers need to be connected in series or in parallel, which greatly increases equipment investment and increases power consumption and heat loss accordingly. It also increases the footprint of the equipment.

Patent CN206724759U discloses a multi-stream heat exchanger, which includes a cylindrical body, a plurality of heat exchange tubes arranged in the cylindrical body, an inflow pipe, an outflow pipe, a liquid inlet chamber, a liquid outlet chamber and a partition plate. This patent divides the liquid inlet chamber and the liquid outlet chamber into multiple independent chambers by arranging partitions in the liquid inlet chamber and the liquid outlet chamber, and the multiple chambers correspond to the same number of heat exchange tubes, which are connected to different media. , to achieve the effect of heat exchange with the fluid in the inner cavity of the cylinder at the same time. In the above technical solution, the heat exchanger is a single shell side, and two pipe side fluids exchange heat with one shell side fluid at the same time, resulting in an increase in the total heat transfer temperature difference, and the two pipe side fluids cannot fully exchange heat with the shell side fluid.

Utility model content

In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a double-flow double-shell-pass full countercurrent heat exchanger.

The technical scheme adopted by the utility model is: a double-flow double-shell-pass full countercurrent heat exchanger, which mainly includes a shell, a heat exchange tube, a semi-arctic baffle, a tube sheet, a tube box, and a tube-pass splitter. The plate, the shell-side split-pass baffle, the shell-side fluid inlet and outlet connections, the first tube-side fluid inlet and outlet connections, and the second tube-side fluid inlet and outlet connections, are characterized in that: the shell is provided with a shell-side splitter The shell-side split-pass separator is vertically welded with one end of the tube sheet, and maintains a certain distance with the other end of the tube sheet, and at the same time is sealed with the shell, so that the shell side is divided into two shell paths; the tube boxes at both ends are provided with The tube side is divided into a partition, and each tube box is provided with a tube side fluid inlet and outlet connection, so that the tube box and the heat exchange tube bundle are divided into the first tube side and the second tube side. The first tube side fluid The inlet pipe is arranged on the pipe box close to the shell side fluid outlet, and is located on the same side of the heat exchanger as the shell side fluid outlet pipe, and the fluid outlet pipe of the tube side is arranged at the corresponding position of the other end of the pipe box; the second pipe The position of the inlet and outlet pipes of the process fluid on the pipe boxes at both ends is just opposite to the left and right of the inlet and outlet pipes of the first pipe side.

In the first tube side and the second tube side, the flow direction of each tube side fluid and the corresponding shell side fluid is countercurrent, and the fluid with a large temperature difference with the shell side fluid goes to the first tube side, and the shell side fluid flows in the opposite direction. The fluid with small temperature difference of fluid goes to the second pipe pass.

The number of heat exchange tubes of the first tube side and the second tube side is determined according to the flow rate and heat exchange of the two tube side fluids, and then the shell side separation distance is determined according to the number of tubes in each tube side. The corresponding positions of the plate and the tube-side split-pass separator, the shell-side split-pass separator and the tube-side split-pass separator are all in the same plane.

The shell-side split-pass baffles and the tube-side split-pass baffles are both arranged horizontally or vertically.

Compared with the prior art, the beneficial effects of the present utility model are as follows: First, the heat exchanger adopts a shell-side split-pass baffle, which can realize double-shell-side flow, increase the fluid velocity on the shell-side, and prolong the flow of the fluid on the shell-side. At the same time, each tube-side fluid and the corresponding shell-side fluid are countercurrent, which improves the overall heat exchange efficiency of the heat exchanger; second, the tube-side fluid with a large temperature difference with the shell-side fluid goes to the first tube-side, and the The tube-side fluid with a smaller temperature difference between the shell-side fluids goes to the second tube-side, which increases the total heat transfer temperature difference of the heat exchanger, and can achieve full heat exchange between the two-tube-side fluid and the shell-side fluid.

Description of drawings

Figure 1 is a schematic structural diagram of a double-flow double-shell-pass full countercurrent heat exchanger.

Reference numerals: 1-tube-side split-pass baffle; 2-first tube-side fluid inlet nozzle; 3-shell fluid outlet nozzle; 4-heat exchange tube; 5-shell-side split-pass baffle; 6-semi-bow Baffle plate; 7-tie rod and spacer pipe; 8-shell; 9-double as flanged tube plate; 10-pipe box flange; 11-first pipe side fluid outlet pipe; 12-pipe box; 13-section The second tube side fluid inlet pipe; 14 - the shell fluid inlet pipe; 15 - the second pipe side fluid outlet pipe.

Detailed ways

The present utility model will be further described below in conjunction with the accompanying drawings.

The double-flow double-shell-pass full counter-flow heat exchanger adopts a fixed tube-sheet heat exchanger. First, the shell-side split-pass separator and one end of the tube sheet are welded and fixed, and then the shell-side split-pass separator is fixed by means of tie rods and spacer tubes. Arrange and fix the half-arc-shaped baffles on both sides, and the gaps of the half-arc-shaped baffles are arranged on the left and right sides, and then pass the heat exchange tubes through the tube sheets and the half-arc-shaped baffles one by one, and then fold the whole tube bundle and the half-arc-shaped baffles one by one. The flow plate is loaded into the shell, and the tube plate is welded to the shell; another tube plate is welded and fixed at the other end of the shell, and the other end of each heat exchange tube is introduced into the tube plate one by one, and then all the heat exchange tubes are welded together. The two ends of the heat pipe are welded and fixed with the corresponding tube sheet; finally, the shell side fluid inlet and outlet pipes and supports are installed to complete the assembly of the entire shell. Next, put the pipe box dividing plate into the pipe box and fix it by welding. Weld the pipe-side fluid inlet and outlet pipes on the pipe boxes at both ends, and then connect the pipe boxes at both ends through the pipe box flange and the shell flange and the shell respectively. The tubes are connected to each other, and the splitter of the tube box is facing the separator groove on the tube plate.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (4)

1. A double-flow double-shell-pass full counter-current heat exchanger, which mainly includes a shell, a heat exchange tube, a semi-arctic baffle, a tube sheet, a tube box, a tube-side split-pass baffle, and a shell-side split-pass baffle , Shell side fluid inlet and outlet pipe, first pipe side fluid inlet and outlet pipe and second pipe side fluid inlet and outlet pipe, it is characterized in that: the shell is provided with a shell side splitter, the shell side split The separator is welded vertically with one end of the tube sheet, keeps a certain distance from the other end of the tube sheet, and is sealed with the shell at the same time, so that the shell side is divided into two shell paths; the tube boxes at both ends are provided with tube side splitting baffles. Each tube box is provided with a tube-side fluid inlet and outlet nozzle, so that the tube box and the heat exchange tube bundle are divided into a first tube side and a second tube side, and the first tube-side fluid inlet nozzle is set close to the shell side fluid. The outlet takes over the tube box and is located on the same side of the heat exchanger as the shell-side fluid outlet, and the fluid outlet of the tube side is set at the corresponding position of the other end of the tube box; the second tube-side fluid inlet and outlet are at both ends The position on the tube box is just opposite to the left and right of the inlet and outlet of the first tube side fluid. 2. The double-flow double-shell-pass full countercurrent heat exchanger according to claim 1, characterized in that: in the first tube-pass and the second tube-pass, the fluid in each tube-pass is associated with the corresponding shell. The flow direction of the fluid in the process is countercurrent, the fluid with a large temperature difference with the shell-side fluid goes to the first tube pass, and the fluid with a small temperature difference from the shell-side fluid goes to the second tube pass. 3. The double-flow double-shell-pass full countercurrent heat exchanger according to claim 1, wherein the number of heat exchange tubes in the first and second tube passes is calculated according to the The flow rate and heat exchange of the fluid are determined, and then the corresponding positions of the shell-side splitter and the tube-side splitter are determined according to the number of tubes in each tube-side. are in the same plane. 4 . The double-flow double-shell-pass full countercurrent heat exchanger according to claim 1 , wherein the shell-side split-pass baffles and the tube-side split-pass baffles are arranged horizontally or vertically. 5 .

Images