Compact gas-gas heat exchange tube and manufacturing and use methods therefor

Abstract

A compact gas-gas heat exchange tube. The heat exchange tube includes a heat transfer tube which is configured to separate an in-tube fluid from an out-tube fluid, and achieve, through convection and heat conduction manners, heat transfer between the in-tube fluid and the out-tube fluid; an inner fin set which is configured to expand a heat exchange surface on an inner side of the heat transfer tube, form a micro-channel to separate the in-tube fluid to make the same to axially flow along the heat transfer tube, and produce a turbulence effect and enhance heat convection as well; an outer fin set which is configured to expand a heat exchange surface on an outer side of the heat transfer tube, form a micro-channel to restrict the out-tube fluid from axially and reversely flowing along the heat transfer tube, and produce a turbulence effect and enhance heat convection as well, wherein a hole is provided on each fin of the inner fin set or/and the outer fin set. The present invention further provides methods for manufacturing and using the compact gas-gas heat exchange tube. The present invention realizes complete reverse flow and efficient heat transfer in a limited space and under a heat exchange working condition of a small logarithmich mean temperature difference, saves a spatial dimension of the apparatus, and reduces a weight of each area as well so as to reduce a total weight and a manufacturing cost.

What is claimed is: 
     
         1 - 19 . (canceled) 
     
     
         20 . A compact gas-gas heat exchange tube, wherein it comprises: a heat transfer tube which is configured to separate an in-tube fluid from an out-tube fluid, and achieve, through convection and heat conduction manners, heat transfer between the in-tube fluid and the out-tube fluid; an inner fin set which is configured to expand a heat exchange surface on an inner side of the heat transfer tube, form a micro-channel with an equivalent diameter of 0.5 mm-5 mm, separate the in-tube fluid to make the same to axially flow along the heat transfer tube, and produce a turbulence effect and enhance heat convection as well; an outer fin set which is configured to expand a heat exchange surface on an outer side of the heat transfer tube, form a micro-channel, restrict the out-tube fluid from axially and reversely flowing along the heat transfer tube, and produce a turbulence effect and enhance heat convection as well, wherein a hole is provided on each fin of the inner fin set or/and the outer fin set. 
     
     
         21 . The compact gas-gas heat exchange tube according to  claim 20 , wherein a positioning tube configured to fix the inner fin set is arranged inside the heat transfer tube, the positioning tube being coaxially arranged inside the heat transfer tube, and one end of each fin in the inner fin set being connected to the positioning tube. 
     
     
         22 . The compact gas-gas heat exchange tube according to  claim 20 , wherein a fin structure of the inner fin set is in a structure radically extending from a tube center to a tube wall. 
     
     
         23 . The compact gas-gas heat exchange tube according to  claim 20 , wherein a fin of the inner fin set is in a Y-shaped structure. 
     
     
         24 . The compact gas-gas heat exchange tube according to  claim 20 , wherein the inner fin set are metal sheets or metal strips radially parallel to the heat transfer tube, and the inner fin set is connected to an inner wall of the heat transfer tube. 
     
     
         25 . The compact gas-gas heat exchange tube according to  claim 21 , wherein the inner fin set is arranged, around the positioning tube, to be metal sheets or metal strips in a circumferential structure, and a surface of the metal sheets or the metal strips is axially parallel to the heat transfer tube. 
     
     
         26 . The compact gas-gas heat exchange tube according to  claim 24 , wherein a width of the metal sheets or the metal strips accounts for ¼-1 of an inner diameter of the heat transfer tube, and a thickness of the metal sheets or the metal strips is 0.2 mm-1.5 mm. 
     
     
         27 . The compact gas-gas heat exchange tube according to  claim 20 , wherein the outer fin set is arranged, around the heat transfer tube, to be metal sheets or metal strips in a circumferential symmetric structure, and a surface of the metal sheets or the metal strip is axially parallel to the heat transfer tube. 
     
     
         28 . The compact gas-gas heat exchange tube according to  claim 20 , wherein the outer fin set are metal sheets or metal strips radially parallel to the heat transfer tube, and the outer fin set is connected to an outer wall of the heat transfer tube. 
     
     
         29 . The compact gas-gas heat exchange tube according to  claim 27 , wherein a width of the metal sheets or the metal strips accounts for ¼-1 of an inner diameter of the heat transfer tube, and a thickness of the metal sheets or the metal strips is 0.2 mm-3 mm. 
     
     
         30 . The compact gas-gas heat exchange tube according to  claim 21 , wherein the positioning tube is a hollowed tube. 
     
     
         31 . The compact gas-gas heat exchange tube according to  claim 20 , wherein the heat transfer tube is a metal tube. 
     
     
         32 . The compact gas-gas heat exchange tube according to  claim 20 , wherein both the inner fin set and the outer fin set are fixedly connected to the heat transfer tube. 
     
     
         33 . A method for manufacturing the compact gas-gas heat exchange tube as defined in  claim 20 , wherein it comprises steps: step 1: forming a heat transfer tube, wherein the heat transfer tube is configured to separate an in-tube fluid from an out-tube fluid, and achieve, through convection and heat conduction manners, heat transfer between the in-tube fluid and the out-tube fluid; step 2: arranging an inner fin set on a heat exchange surface on an inner side of the heat transfer tube, and providing a hole on each fin of the inner fin set; wherein the inner fin set is configured to expand the heat exchange surface on the inner side of the heat transfer tube to form a micro-channel with an equivalent diameter of 0.5 mm-5 mm, separate the in-tube fluid to make the same to axially flow along the heat transfer tube, and produce a turbulence effect and enhance heat convection as well; and step 3: arranging an outer fin set on a heat exchange surface on an outer side of the heat transfer tube, and providing a hole on each fin of the outer fin set; wherein the outer fin set is configured to expand the heat exchange surface on the outer side of the heat transfer tube to form a micro-channel, restrict the out-tube fluid from axially and reversely flowing along the heat transfer tube, and produce a turbulence effect and enhance heat convection as well. 
     
     
         34 . A method for manufacturing the compact gas-gas heat exchange tube as defined in  claim 21 , wherein it comprises steps: step 1: forming a heat transfer tube, wherein the heat transfer tube is configured to separate an in-tube fluid from an out-tube fluid, and achieve, through convection and heat conduction manners, heat transfer between the in-tube fluid and the out-tube fluid; step 2: arranging a positioning tube configured to fix the inner fin set inside the heat transfer tube, wherein the positioning tube is coaxially arranged inside the heat transfer tube; step 3: arranging the inner fin set on a heat exchange surface on an inner side of the heat transfer tube, wherein one end of each fin in the inner fin set is connected to the positioning tube; providing a hole on each fine of the inner fin set, wherein the inner fin set is configured to expand the heat exchange surface on the inner side of the heat transfer tube to form a micro-channel with an equivalent diameter of 0.5 mm-5 mm, separate the in-tube fluid to make the same to axially flow along the heat transfer tube, and produce a turbulence effect and enhance heat convection as well; and step 4: arranging an outer fin set on a heat exchange surface on an outer side of the heat transfer tube, providing a hole on each fin of the outer fin set, wherein the outer fin set is configured to expand the heat exchange surface on the outer side of the heat transfer tube to form a micro-channel, restrict the out-tube fluid from axially and reversely flowing along the heat transfer tube, and produce a turbulence effect and enhance heat convection as well. 
     
     
         35 . The method for manufacturing the compact gas-gas heat exchange tube according to  claim 33 , wherein in step 2, the inner fin set is connected to an inner wall of the heat transfer tube fixing the outer fin set. 
     
     
         36 . A method for using the compact gas-gas heat exchange tube as defined in  claim 20 , wherein it comprises steps: arranging at least one heat transfer tube in a heat exchanger, wherein an in-tube fluid of the heat transfer tube is input through an in-tube fluid inlet end of the heat exchanger, flows, along an inner side of the heat transfer tube, to an outlet end of the heat transfer tube, and then flows to an in-tube fluid outlet end of the heat exchanger; in a flow process, the in-tube fluid of the heat transfer tube is subjected to a heat convection process with an inner fin set and an inner side surface of the heat transfer tube; an out-tube fluid of the heat transfer tube is input from an out-tube fluid inlet end of the heat exchanger, flows, along an outer side of the heat transfer tube, in a direction opposite that of the in-tube fluid of the heat transfer tube, and flows to an out-tube fluid outlet end of the heat exchanger; and in the flow process, the out-tube fluid of the heat transfer tube is subjected to a heat transfer process with an outer side surface of the heat transfer tube and the outer fin set, and a heat conduction process is generated among the outer fin set, the heat transfer tube and the inner fin set. 
     
     
         37 . The method for using the compact gas-gas heat exchange tube as defined in  claim 21 , wherein it comprises steps: arranging at least one heat transfer tube in a heat exchanger, wherein an in-tube fluid of the heat transfer tube is input through an in-tube fluid inlet end of the heat exchanger, flows, along an inner side of the heat transfer tube, to an outlet end of the heat transfer tube, and then flows to an in-tube fluid outlet end of the heat exchanger; in a flow process, the in-tube fluid of the heat transfer tube is subjected to a heat convection process with an inner fin set, a positioning tube and an inner side surface of the heat transfer tube; an out-tube fluid of the heat transfer tube is input from an out-tube fluid inlet end of the heat exchanger, flows, along an outer side of the heat transfer tube, in a direction opposite that of the in-tube fluid of the heat transfer tube, and flows to an out-tube fluid outlet end of the heat exchanger; and in the flow process, the out-tube fluid of the heat transfer tube is subjected to a heat transfer process with an outer side surface of the heat transfer tube and the outer fin set, and a heat conduction process is generated among the outer fin set, the heat transfer tube, the inner fin set and the positioning tube. 
     
     
         38 . The method for using the compact gas-gas heat exchange tube as defined in  claim 36 , wherein it comprises steps: under the condition that a hole is provided on a fin of the inner fin set, making an in-tube fluid of a heat transfer tube to flow through the hole on the fin of the inner fin set and axially flow along the heat transfer tube; under the condition that a hole is provided on a fin of the outer fin set, making an out-tube fluid of a heat transfer tube to flow through the hole on the fin of the outer fin set and axially flow along the heat transfer tube; performing reverse flow heat exchange between the in-tube fluid and the out-tube fluid of the heat transfer tube; expanding, by the inner fin set, a heat exchange surface on an inner side of the heat transfer tube, forming a micro-channel to restrict the out-tube fluid from axially and reversely flowing along the heat transfer tube, and producing a turbulence effect and enhancing heat convection as well; and expanding, by the outer fin set, a heat exchange surface on an outer side of the heat transfer tube, forming a micro-channel to restrict the out-tube fluid from axially and reversely flowing along the heat transfer tube, and producing a turbulence effect and enhancing heat convection as well.