CN207147275U - Multiple flow reduced pipe wound tube heat exchanger - Google Patents

Abstract

The utility model discloses a multi-flow different-diameter tube-wound heat exchanger, which includes a shell, a tube box, a tube plate, a core tube, a coiled tube, a positioning bar, a shell-side inlet and outlet pipe, a tube-side inlet and outlet pipe, The dividing plate and the lug-type support are characterized in that: for each layer of winding pipes outside the core cylinder, they are formed by winding pipes of at least two diameters alternately, and the axial distance between the winding pipes of the same layer is determined by The positioning bar is positioned, the helix angles of the adjacent inner and outer coils are the same and the winding directions are opposite. The two ends of all the coils are divided into two tube bundles according to the diameter of the tubes. and separate the two areas by setting a partition plate on the tube sheet and inside the tube box, and the two tube bundles at each end can also be arranged on two small tube sheets. The utility model realizes simultaneous heat exchange between multiple streams of tube-side fluid and shell-side fluid, and through the alternate arrangement of winding tubes with different diameters, the radial gap between the winding tubes is increased, and the comprehensive heat exchange effect of the shell-side fluid is enhanced.

Description

Multi-stream reducer tube wound heat exchanger

technical field

The utility model relates to the technical field of shell-and-tube heat exchangers, in particular to a coiled-tube heat exchanger with multi-flow different-diameter tubes.

Background technique

Heat exchangers play an important role in energy, power, chemical, petroleum and many other industrial productions. Wound tube heat exchanger is a shell-and-tube heat exchanger with compact structure and high heat exchange efficiency. It mainly includes main parts such as tube box, tube sheet, shell, core tube and coiled tube. The central position of the tube sheets at both ends is used as the support for the winding tube bundle, and the multi-layer winding tubes are wound outside the core tube.

There are two types of existing coiled heat exchangers: single flow and multiple streams, but no matter which type, the heat exchange tubes of the same diameter are used in the coiled heat exchangers, and the coiled tubes are placed in the core tube. The outside is closely wound, and both the axial distance and the transverse distance are very small, resulting in a large flow resistance of the shell-side fluid, and a decrease in the disturbance effect and convective heat transfer effect of the shell-side fluid. Therefore, the structure and arrangement of the coiled tubes in the coiled tube heat exchanger need to be improved.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the utility model provides a multi-flow reducer tube-wound heat exchanger.

The technical solution adopted in the utility model is: the multi-flow different-diameter tube-wound heat exchanger includes a shell, a tube box, a tube plate, a core tube, a coiled tube, a positioning bar, a shell-side inlet and outlet pipe, and a tube-side inlet and outlet The tube, split-pass partition and lug-type support are characterized in that: for each layer of coiled tubes outside the core cylinder, the coiled tubes of two diameters are alternately wound, and the axial distance between the coiled tubes of the same layer Use the positioning bar to locate, the helix angle of the adjacent inner and outer winding pipes is the same and the winding direction is opposite; the two ends of all the winding pipes are divided into two tube bundles according to the diameter of the pipe, and the two tube bundles at each end have two arrangements: one is The two tube bundles of each section are respectively arranged in two areas of the same tube sheet, and a partition plate is set on the tube sheet and inside the tube box to separate the two areas; the second is that the two tube bundles at each end are respectively arranged in Two small tube sheets are provided with tube boxes and inlet and outlet pipes respectively, which pass through the head and are symmetrically fixed at the 45° angle position of the head; both tube bundle arrangements form a tube-side double flow.

The coiled tubes are not limited to two kinds of tube diameters. When coiled tubes with multiple tube diameters are used, each layer of coiled tubes outside the core cylinder is wound by coiled tubes with multiple tube diameters in turn. Each tube diameter The coiled tube bundles are used as a tube pass, and each tube bundle is arranged in multiple areas of the same tube sheet, and separate partitions are set on the tube sheet and in the tube box to separate each area, thus forming a multi-pass tube stream.

When multiple pipe diameters are used for the winding pipe, the winding pipe bundles of each pipe diameter adopt independent small tube plates, and each small tube plate is respectively provided with a pipe box and an inlet and outlet pipe, which pass through the head and are symmetrically fixed on the end of the head. 45° angle position, thus forming multiple streams in the tube side.

The size of the pipe diameter of each kind of winding pipe is determined according to the process conditions of the fluid in each pipe pass under the actual operating conditions.

Compared with the prior art, the utility model has the following beneficial effects: First, winding pipes with various pipe diameters are arranged in partitions on one tube plate or a plurality of small tube plates, thereby forming multiple streams of tube-side fluid and realizing multiple The tube-side fluid in different working conditions can exchange heat with a shell-side fluid at the same time, which can replace multiple ordinary tube heat exchangers and improve the comprehensive heat exchange effect of the shell-side fluid; All adopt the winding method of winding pipes with various pipe diameters sequentially, which increases the radial gap between the inner and outer layers of winding pipes and the axial gap between the same layer of winding pipes, which can significantly reduce the fluid flow resistance of the shell side and strengthen the shell. The turbulence of the process fluid and the convective heat transfer effect; the third is the four-tube-sheet structure. Compared with the double-tube-sheet structure, it can greatly reduce the consumption of tube-sheet materials, reduce the weight of the tube-sheet and the total weight of the heat exchanger, and save manufacturing costs.

Description of drawings

Figure 1 is a multi-flow reducer tube-wound heat exchanger with double tube sheets.

Attachment 1 marks: 1-partition partition; 2-pipe box; 3-small-diameter wound pipe pass outlet pipe; 4-shell pass inlet pipe; 5-shell; 6-tube sheet; 7-small diameter pipe wound pipe 8-inlet pipe of large-diameter winding tube; 9-exit pipe of shell side; 10-small-diameter winding; 11-large-diameter winding; 12-ear support; 13-core tube; 14-large Diameter around the tube side outlet tube.

Figure 2 is a multi-flow reducer tube-wound heat exchanger with four tube sheets.

Attachment 2 marks: 1-shell-side inlet pipe; 2-tube-side outlet box of small-diameter coiled tube; 3-head; 4-tube sheet; 5-shell; 6-small-diameter coiled tube; 7-small-diameter coiled tube 8- shell side outlet pipe; 9- tube side inlet box of large-diameter wound pipe; 10- large-diameter wound pipe; 11- core tube; 12- ear support; 13- large diameter The tube side of the coiled tube exits the tube box.

Detailed ways

The assembly process of the multi-flow reducer tube-wound heat exchanger will be further described below with reference to the accompanying drawings.

Taking the double-tube-sheet double-flow reducer tube-wound heat exchanger as an example, first, the core tube and the tube sheets at both ends are welded and fixed, and then each layer of winding tubes is made of winding tubes of various diameters according to the The designed helix angles are wound outside the core barrel in turn, and then, the two ends of all the wound pipes are divided into two tube bundles according to the diameter of the tubes, and the two tube bundles at one end penetrate into the two areas of the same tube sheet respectively, and the two tube bundles at the other end The two tube bundles respectively penetrate into the two areas corresponding to another tube sheet.

For the four-tube-sheet double-flow reducer tube-wound heat exchanger, firstly, the core tube and the circular frame similar to the tube sheet at both ends are welded and fixed, and then each layer of winding tube is made of various tube diameters. The winding tubes are wound outside the core barrel in turn according to the designed helix angle, and then, the two ends of all the winding tubes are divided into two tube bundles according to the diameter of the tubes, and the two tube bundles at one end pass through the circular frame and penetrate into two tube sheets , and the two tube bundles at the other end respectively penetrate into the corresponding other two tube sheets.

The axial distance between the winding tubes of the same layer is positioned by positioning strips, which are welded and fixed on the bottom plate in advance, and the bottom plate is arranged along the axial direction of the core tube, and welded and fixed on the core tube; the winding direction of the adjacent inner and outer layers of the tube On the contrary, the connection between the two ends of the coiled tube and the tube plate is fixed by first expansion and then welding; the tube bundle composed of the core tube and the coiled tubes with different diameters is integrally loaded into the shell.

For the double-flow different-diameter tube-wound heat exchanger with double-tube sheets, the tube sheets at both ends are welded and fixed to the shell, and a split-pass separator is installed in the tube boxes at both ends. The two sides correspond to the inlet and outlet pipes of the welded tube side respectively, and the tube boxes at both ends with the partition plate are connected to the tube plate by welding, and the inlet and outlet tubes of the shell side are set at the top center of the head of the tube box at both ends.

For the four-tube-sheet double-flow reducer tube-wound heat exchanger, the circular frames at both ends of the tube bundle are fixed on the inner wall of the cylinder with 4-6 angle steels, and the two tube sheets at each end of the tube bundle are connected to two small tube boxes. Two small pipe boxes pass through the head and are welded and fixed at the 45° angle of the head, and then the head is connected to the shell by butt welding, and the inlet and outlet pipes of the shell side are set at the top center of the head at both ends.

When the multi-flow different-diameter tube-wound heat exchanger is working, the shell-side heat exchange medium flows in from the shell-side fluid inlet pipe, and axially washes the coiled tubes of different diameters in the shell side, and at the same time conducts convective heat exchange with the coiled tubes , and finally flows out from the shell-side fluid outlet pipe; the two heat exchange media in the tube side respectively flow into the tube-side fluid inlet pipes corresponding to the two diameters of the coiled pipe, and the heat exchange medium passes through the two diameters of the coiled pipe and simultaneously with the shell side The fluid exchanges heat and is finally discharged from the two tube-side outlet pipes respectively.

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

Claims (3)

1. Multi-flow reducer tube-wound heat exchanger, including shell, tube box, tube plate, core tube, coiled tube, positioning strip, shell side inlet and outlet pipes, tube side inlet and outlet pipes, split-pass partitions The ear-type support is characterized in that: for each layer of winding pipes outside the core cylinder, it is formed by winding pipes of two diameters alternately, and the axial distance between the winding pipes of the same layer is positioned with positioning strips. The helix angle of the inner and outer coils is the same and the winding direction is opposite; all ends of the coils are divided into two tube bundles according to the diameter of the tubes, and the two tube bundles at each end have two arrangements: one is two tube bundles at each end They are respectively arranged in two areas of the same tube sheet, and a partition plate is set on the tube sheet and in the tube box to separate the two areas; the second is that the two tube bundles at each end are respectively arranged on two small tube sheets, The two small tube sheets are respectively provided with the pipe box and the inlet and outlet pipes, which pass through the head and are symmetrically fixed at the 45° angle position of the head; both tube bundle arrangements form a tube-side double flow. 2. The coil-wound heat exchanger with multi-flow different-diameter tubes according to claim 1, characterized in that: the coiled tubes are not limited to two kinds of tube diameters, when coiled tubes with various tube diameters are used, the core Each layer of coiled tubes outside the cylinder is wound by coiled tubes of various diameters in sequence. The coiled tube bundles of each diameter are regarded as a tube pass, and each tube bundle is arranged in multiple areas of the same tube sheet. In addition, dividers are arranged on the tube sheet and inside the tube box to separate each area, thereby forming multiple streams in the tube pass. 3. The coil-wound heat exchanger with multi-flow different-diameter tubes according to claim 1, characterized in that: when the coiled tubes adopt multiple pipe diameters, the coiled tube bundles of each pipe diameter adopt independent small tubes Each small tube plate is provided with a tube box and an inlet and outlet pipe, which pass through the head and are symmetrically fixed at the 45° angle of the head, thus forming multiple streams in the tube side.