CN-119983903-B - Steam heat exchange tube and steam-water mixed heat exchanger thereof

Abstract

The invention provides a steam heat exchange tube and a steam-water mixed heat exchanger thereof, wherein the heat exchange tube comprises a tube body and spiral flow passage sheets arranged outside the tube body, one end of the heat exchange tube is opened for steam inflow, the other end of the heat exchange tube is closed, a steam outlet hole is arranged on the tube body between the spiral flow passage sheets, and steam in the heat exchange tube flows out through the steam outlet hole. According to the invention, steam flows along the spiral flow channel, is fully mixed with externally flowing liquid, so that the turbulence effect of the steam-liquid mixing is enhanced, and the steam-liquid heat exchange effect can be improved.

Inventors

• LI JIANGMAN
• XU JUNJIE
• DAI XUEYAN
• ZHAO ZHENYI
• ZHANG XIN
• CHANG JIANLONG
• PENG CHENG
• YANG XINYU
• ZHANG JIANHONG

Assignees

• 中北大学
• 西安交通大学

Dates

Publication Date

20260512

Application Date

20250125

Claims (5)

1. 1. A steam-water mixed heat exchanger comprises a tube shell, heat exchange tubes, liquid inlet connecting tubes, an inlet end socket and an outlet end socket, wherein the liquid inlet connecting tubes are arranged on the tube shell, a steam inlet tube and a fluid outlet tube are respectively arranged on the inlet end socket and the outlet end socket, an inlet tube plate is arranged between the inlet end socket and the tube shell, an outlet tube plate is arranged between the outlet end socket and the tube shell, the heat exchange tubes are arranged in the tube shell, a first end and a second end of each heat exchange tube are fixedly connected with the inlet tube plate and the outlet tube plate respectively, the first end is communicated with the inlet end socket, the second end is not communicated with the outlet end socket, a steam outlet hole for steam outflow is formed in the tube wall of each heat exchange tube, the outlet tube plate is provided with a through hole for communicating the tube shell and the outlet end socket.
2. 2. The heat exchanger of claim 1, wherein the flow area of the steam outlet holes increases progressively more.
3. 3. The heat exchanger of claim 1, wherein the steam enters the heat exchange tube from the steam inlet tube through the end enclosure and then exits through the steam outlet hole of the heat exchange tube to exchange heat with the liquid entering through the liquid inlet connection tube, and the fluid after heat exchange enters the outlet end enclosure through the through hole of the outlet tube plate and then exits from the fluid outlet tube.
4. 4. The heat exchanger of claim 1, wherein the pitch between the spiral flow sheets and the height of the spiral flow sheets are 1 (1.5-2).
5. 5. The heat exchanger of claim 1, wherein the height of the spiral flow fins is 0.3 to 0.4 times the outer diameter of the heat exchange tube.

Description

Steam heat exchange tube and steam-water mixed heat exchanger thereof Technical Field The invention relates to a heat exchange tube and a heat exchanger thereof, in particular to a steam heat exchange tube and a heat exchanger for steam-water mixed heat exchange. Background The shell-and-tube heat exchanger is widely applied to industries such as chemical industry, petroleum, refrigeration, nuclear energy, power and the like, and because of the worldwide energy crisis, in order to reduce energy consumption, the demand for the heat exchanger in industrial production is also increasing, and the quality requirement for the heat exchanger is also increasing. In recent decades, although compact heat exchangers (plate-type, plate-fin-type, pressure-welded plate-type heat exchangers, etc.), heat pipe-type heat exchangers, direct contact heat exchangers, etc. have been rapidly developed, shell-and-tube heat exchangers still occupy the dominant position of yield and usage due to high reliability and wide adaptability, and the usage of the shell-and-tube heat exchangers in the current industrial devices still accounts for about 70% of the usage of all heat exchangers according to relevant statistics. At present, people usually adopt a heat exchanger to heat water, in various shell-and-tube type and plate-type heat exchangers, steam and water respectively walk different channels, heat exchange is realized through good conductors, and water flow channels are generally coiled and zigzag so as to increase the contact area with the steam and enable the water flow channels to be heated fully, so that the defects of complex structure, low heating speed, high vibration noise, low heat efficiency and the like exist, and although the noise can be reduced to a certain extent by installing a silencer, the flow and the flow velocity of the steam must be limited, and the defects of low heating speed and low heat efficiency still exist. The prior art also discloses some utility models related to vapor-liquid direct mixing heat exchange, for example, CN104075590A discloses a mute vapor-water mixing heat exchanger. The mute steam-water mixing heat exchanger comprises a main body, wherein the main body is provided with a water inlet end and a water outlet end along the water flow direction, the side wall of the main body is provided with a steam inlet end, the water inlet end and the water outlet end are both of cone structures, steam spraying spray holes are formed in the pipe wall of the water outlet end, an included angle between the axis of each spray hole and the axis of the pipe wall is 40-65 degrees, a filler layer for muting is filled in the main body, the steam inlet end is provided with a filter screen, and a drain plug is arranged on the side wall of the main body corresponding to the steam inlet end. The utility model has reasonable design, adopts the mute filler layer, is mute, has no vibration, has low cost, is arranged in a pipeline system, has high heating efficiency, is convenient to install and maintain, and improves the working efficiency. CN202709791U discloses a composite steam-water mixing tank, which comprises a tank body, a blow-down valve, a steam inlet, a cold water inlet, a porous partition plate, a temperature controller interface, a water outlet and a blow-down pipe, wherein the blow-down valve is arranged at the bottom of the tank body, the steam inlet is arranged at the side surface of the lower end of the tank body, the porous partition plate is arranged inside the tank body, the cold water inlet is arranged at the side surface of the tank body and is positioned between the steam inlet and the porous partition plate, and the water outlet, the blow-down pipe and the temperature controller interface are arranged at the top end of the tank body. The utility model fully improves the scaling problem on the basis of the traditional mixing tank, is suitable for the environment with high water hardness, not only can realize convenient disassembly and cleaning, but also can solve the difficult problem of waste heat recovery, and radically eliminates scaling and blocking. In the prior art, various problems exist in the mixed heat exchange of steam and liquid, such as single heat exchange tube, small heat exchange area of the mixed heat exchange of steam and liquid, poor mixed effect of steam and liquid and the like. The application improves the heat exchange tube, adopts the heat exchange tube with a new structure and the heat exchanger thereof, enlarges the heat exchange area, increases the mixing area and ensures better vapor-liquid mixing effect. Disclosure of Invention In order to overcome the defects and shortcomings in the prior art, the invention provides the steam heat exchange tube and the steam-liquid heat exchanger thereof, which can enlarge the heat exchange area and increase the mixing area, thereby effectively improving the heat transfer efficiency. In order to achieve the above object, the technica