CN215003106U

CN215003106U - Phase change heat exchanger

Info

Publication number: CN215003106U
Application number: CN202120796416.4U
Authority: CN
Inventors: 金延超; 张龙龙; 刘汝刚; 崔建波
Original assignee: Doright Co ltd
Current assignee: Doright Co ltd
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2021-12-03
Anticipated expiration: 2031-04-19

Abstract

The utility model discloses a phase change heat exchanger, in particular to a heat exchanger containing liquid to gas phase change process, which comprises a boiling section and a superheating section. The phase-change heat exchanger is vertically arranged, the boiling section is positioned at the bottom of the superheating section, cold fluid flows into the shell of the boiling section from a cold fluid inlet, the boiling section is provided with a gas phase space, the fluid is changed into gas in the boiling section after absorbing heat and flows through the heat exchange tube of the hot section and then is discharged from a cold fluid outlet, hot fluid flows in from the hot fluid inlet, flows out from the outlet of the boiling section after flowing through the heat exchange tube of the boiling section, then flows in from the inlet of the hot section after flowing through the inlet of the hot section, and is discharged from the hot fluid outlet after flowing through the shell of the superheating section. The equipment can solve the problem of short service life caused by cavitation generated by violent boiling when phase change occurs in the heat exchange process, particularly the heat exchange process of phase change from liquid to gas, and can obtain overheated gas.

Description

Phase change heat exchanger

Technical Field

The utility model relates to a phase change heat exchanger especially relates to and contains liquid to gas phase transition process's heat exchanger.

Background

When the phase change occurs in the heat exchange process, particularly in the heat exchange process of the phase change from liquid to gas, the density of the fluid is sharply reduced to become gas, the gas is accompanied with violent boiling in the process, and the phase change can be generated only by absorbing a certain amount of heat when the fluid reaches the saturation temperature due to the influence of latent heat of vaporization. The phase change heat exchangers known at present are divided into two types, one is that fluid with phase change is in a heat exchange tube, the heat exchange tube is easy to lose effectiveness due to cavitation erosion because of violent boiling in the phase change process, the service life of equipment is short, and the other is that the fluid with phase change is outside the heat exchange tube and has a single gas phase space, and the heat exchanger can only obtain gas at saturation temperature and can not obtain overheated gas.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a phase change heat exchanger, solve the problem that violent boiling produces cavitation erosion and leads to the equipment life to be short to can obtain overheated gas.

For solving the problem, the utility model discloses a phase change heat exchanger includes boiling section and two parts of hot section, the boiling section includes the boiling section head, the boiling section casing, boiling section casing flange, the boiling section heat exchange tube, the cold flow import, the hot flow import, the export of hot flow boiling section, the level gauge gas phase mouth, the level gauge liquid phase mouth, the hot section includes the hot section casing, under the hot section tube sheet, the hot section heat exchange tube, the baffling board, the tube sheet on the hot section, overflow the hot section import, the hot flow export, the pipe case casing, the pipe case flange, the pipe case head, the cold flow export, hot flow boiling section export is communicate by the connecting tube with the import of hot flow hot section.

And the cold fluid in a liquid state enters the boiling section, absorbs the heat of the hot fluid, boils at the interface to become saturated gas, and the saturated gas enters the heat exchange tube of the heat exchange section to further exchange heat with the hot fluid to obtain superheated gas. Because the fluid boiling phase change process is carried out on a larger interface, the boiling intensity is reduced, the contact area between a boiling area and equipment is small, and the problem of short service life of the equipment caused by boiling cavitation is solved.

Drawings

The following detailed description of embodiments of the invention is provided with reference to the accompanying drawings, in which:

fig. 1 is a schematic view of the present invention.

Detailed Description

Fig. 1 shows a schematic diagram of the present invention. The utility model discloses phase change heat exchanger, including boiling section and superheated section, equipment is vertical arrangement, the boiling section is located superheated section bottom, cold fluid flows into in the boiling section casing from the cold flow inflow entrance, the boiling section has the gas phase space, become gaseous cocurrent flow behind the fluid heat absorption in the boiling section and discharge from the cold flow exit behind the hot section heat transfer pipe, hot-fluid flows into from the hot flow entrance, flow through in the boiling section heat transfer pipe back from the hot flow boiling section export outflow, again flow through the hot section import inflow of flowing through, flow through in the superheated section casing back from the hot flow exit discharge, concrete implementation is as follows:

the boiling section shell 2 is a cylindrical shell with the axis vertically arranged, the lower end of the boiling section shell is connected with the boiling section end enclosure 1, the upper end of the boiling section shell is connected with a boiling section shell flange 3, the liquid level of cold fluid is arranged at a certain position of the boiling section shell, a part below the liquid level of the boiling section shell 2 is provided with a hot fluid inlet, a hot fluid boiling section outlet and a liquid level meter liquid phase port, a part above the liquid level is provided with a liquid level meter gas phase port, the boiling section end enclosure 1 is provided with a cold fluid inlet, one or more groups of boiling section heat exchange tubes 4 are arranged inside the boiling section shell 2, the boiling section heat exchange tubes 4 are immersed in the liquid, one end of each boiling section heat exchange tube is connected and communicated with the hot fluid inlet, and the other end of each boiling section heat exchange tube is connected and communicated with the hot fluid boiling section outlet.

The superheating section shell 7 is a cylindrical shell with the axis arranged vertically, the lower end of the shell is connected with the lower superheating section tube plate 6, the upper end of the shell is connected with the upper superheating section tube plate 10, the lower superheating section tube plate 6 and the upper superheating section tube plate 10 are circular flat plates, a plurality of tube holes are arranged at the same positions, flange bolt holes are circumferentially arranged, the superheating section heat exchange tubes 8 are positioned inside the superheating section shell 7, one ends of the superheating section heat exchange tubes penetrate through the tube holes of the lower superheating section tube plate 6 and are connected, the other ends of the superheating section heat exchange tubes penetrate through the tube holes of the upper superheating section tube plate 10 and are connected, a plurality of baffle plates 9 with arc notches are positioned between the lower superheating section tube plate 6 and the upper superheating section tube plate 10 and are arranged in a staggered mode to form a flow channel with the outer part of the heat exchange tubes turned back, one end of the superheating section shell 7 is provided with a superheating section inlet, the other end is provided with a heat outlet, the tube box shell 12 is a cylindrical shell with the axis arranged vertically, and the lower end of the tube box flange 11, the upper end of the tube box is connected with a tube box end enclosure 13, a cold flow outlet is arranged on the tube box end enclosure 13, and the upper tube plate 10 of the overheating section is connected with the tube box flange 11 through bolts to form static seal.

The boiling section shell flange 3 is connected with the lower tube plate 6 of the superheating section through bolts to form static seal, so that the boiling section is communicated with the cold fluid cavity of the superheating section.

The outlet of the heat flow boiling section is communicated with the inlet of the heat flow overheating section through a connecting pipeline 5, so that the boiling section is communicated with the heat flow cavity of the overheating section.

Claims

1. A phase change heat exchanger comprising a boiling section and a superheating section, characterized in that: the phase-change heat exchanger is vertically arranged, the boiling section is positioned at the bottom of the superheating section, cold fluid flows into the shell of the boiling section from a cold fluid inlet, the boiling section is provided with a gas phase space, the fluid is changed into gas in the boiling section after absorbing heat and flows through the heat exchange tube of the hot section and then is discharged from a cold fluid outlet, hot fluid flows in from the hot fluid inlet, flows out from the outlet of the boiling section after flowing through the heat exchange tube of the boiling section, then flows in from the inlet of the hot section after flowing through the inlet of the hot section, and is discharged from the hot fluid outlet after flowing through the shell of the superheating section.

2. A phase change heat exchanger as claimed in claim 1, wherein: the boiling section comprises a boiling section end socket, a boiling section shell flange, a boiling section heat exchange tube, a cold flow inlet, a heat flow boiling section outlet, a liquid level meter gas phase port and a liquid level meter liquid phase port, wherein one group or multiple groups of boiling section heat exchange tubes are arranged in the boiling section shell, the boiling section heat exchange tubes are immersed in liquid, one end of each boiling section heat exchange tube is connected and communicated with the heat flow inlet, and the other end of each boiling section heat exchange tube is connected and communicated with the heat flow boiling section outlet.

3. A phase change heat exchanger as claimed in claim 1, wherein: the superheating section comprises a superheating section shell, a superheating section lower tube plate, a superheating section heat exchange tube, a baffle plate, a superheating section upper tube plate, a heat flow superheating section inlet, a heat flow outlet, a tube box shell, a tube box flange, a tube box end socket and a cold flow outlet, wherein the plurality of baffle plates with arc-shaped notches are positioned between the superheating section lower tube plate and the superheating section upper tube plate and are penetrated and arranged in a staggered mode by the superheating section heat exchange tube to form a flow channel for the external turning of the heat exchange tube.

4. A phase change heat exchanger as claimed in claim 1, wherein: the boiling section shell flange is connected with the lower tube plate of the superheat section through a bolt to form static seal, so that the boiling section is communicated with the cold fluid cavity of the superheat section.

5. A phase change heat exchanger as claimed in claim 1, wherein: the outlet of the heat flow boiling section is communicated with the inlet of the heat flow superheating section through a connecting pipeline, so that the boiling section is communicated with the heat flow cavity of the superheating section.