Liquid-Vapor Separating Method and a Liquid-Vapor Separating Type Evaporator

Abstract

A liquid-vapor separating method and a liquid-vapor separating type evaporator, the method includes the following steps: (i) provide a partition device ( 3 ) in the upper portion of the evaporated liquid pipe, the partition device ( 3 ) divides the evaporated liquid pipe into a superheating section ( 12 ) and an evaporating section ( 13 ); (ii) a liquid-vapor separating pipe ( 4 ) is connected to the superheating section ( 12 ) near the partition device ( 3 ), an evaporated liquid feeding pipe ( 6 ) is connected to the evaporating section ( 13 ) near the partition device ( 3 ), several vapor guiding pipes ( 5 ) are respectively provided in the pipe of the evaporating section ( 13 ), the vapor guiding pipes ( 5 ) are respectively connected with the liquid-vapor separating pipe ( 4 ); vapor inside the pipe can flow out, and is separated into vapor and liquid in the liquid-vapor separating pipe ( 4 ), then the vapor enters the superheating section ( 12 ) and is superheated; the superheated vapor is discharged from a vapor outlet ( 11 ); (iii) the residual liquid separated from the liquid-vapor separating pipe ( 4 ) and the residual liquid in evaporating section ( 13 ) are together sent to the evaporated liquid feeding pipe ( 6 ) through a return pipe ( 14 ), and back to the evaporating and heat-exchanging process of evaporated liquid.

1 . A liquid-vapor separation method for a liquid-vapor separation evaporator, comprising:
 in a tube through which an evaporated liquid flows, setting a separation device for partitioning the tube into a superheat segment and an evaporation segment;   connecting a liquid-vapor-separation tube to the superheat segment adjacent to the separation device, and connecting an incoming tube for circulating evaporated liquid to the evaporation segment nearby the separation device, setting a plurality of spaced steam drainage tubes at the tube of the evaporation segment, and each of the steam drainage tubes is connected to the liquid-vapor-separation tube respectively, thus an evaporated vapor can be vented at each segment and enter into the superheat segment for superheating after separating vapor and liquid, and then a superheated steam can be vented via a steam outlet; and   conveying a residual liquid from the liquid-vapor-separation tube and an incompletely evaporated residual liquid from the evaporation segment to the incoming tube for the evaporated liquid and returning to an evaporation process for heat exchange.   
     
     
         2 . The liquid-vapor separation method for the liquid-vapor separation evaporator of  claim 1  wherein,
 an evaporated liquid flows through a tube between an outer tube and an inner tube, and the separation device is an annular separation plate arranged between the said outer tube and the inner tube, and a heating fluid flows through the inner tube.   
     
     
         3 . The liquid-vapor separation method for the liquid-vapor separation evaporator of  claim 1  wherein,
 an evaporated liquid flows through a tube composed by a single layer inner tube arranged with a plurality of fins outside the tube and a heating fluid flows outside the inner tube.   
     
     
         4 . The liquid-vapor separation method for the liquid-vapor separation evaporator of  claim 1  wherein,
 the evaporated liquid flows through an inner tube, outside of which an outer tube is arranged, and a heating fluid flows through between the outer and the inner tube.   
     
     
         5 . A liquid-vapor separation evaporator, comprising:
 a tube, through which an evaporated liquid flows;   a tube, through which a heating gas flows, or a space through which the heating fluid flows, characterized in that a separation device is arranged at an upper of the tube through which the evaporated liquid flows, and the tube through which the evaporated liquid flows is partitioned into a superheat segment and an evaporation segment; a liquid-vapor separation tube is connected to the separation device near the superheat segment, and an incoming tube for circulating evaporated liquid is connected to the separation device near the evaporation segment, a plurality of steam drainage tubes are set to the tube of separate portions of the evaporation segment, each of the steam drainage tubes is connected to the liquid-vapor separation tube respectively; a bottom of the liquid-vapor separation tube is connected to an inlet of the incoming tube of evaporated liquid.   
     
     
         6 . The liquid-vapor separation evaporator of  claim 5 , wherein the tube for the evaporated liquid is a tube between an outer tube and an inner tube, and the separation device is an annular separation plate set between the said outer tube and the inner tube, a bottom port of the inner tube is an inlet of the heating fluid and a top port of the inner tube is an outlet of the heating fluid. 
     
     
         7 . The liquid-vapor separation evaporator of  claim 6 , wherein a shape of the outer tube and a shape of the inner tube are spiral or vertical serpentine. 
     
     
         8 . The liquid-vapor separation evaporator of  claim 5 , wherein the tube for the evaporated liquid is a single layer inner tube, and the fins are set outside the inner tube. 
     
     
         9 . The liquid-vapor separation evaporator of  claim 5 , wherein the tube through which the evaporated liquid flows is an inner tube, outside of which is arranged an outer tube, and the separation device is a circular plate set inside the inner tube, a bottom port of the outer tube is an inlet of the heating fluid, and a top port of the outer tube is an outlet of the heating fluid. 
     
     
         10 . The liquid-vapor separation evaporator of  claim 9 , wherein a shape of the outer tube and a shape of the corresponding inner tube are spiral or vertical serpentine. 
     
     
         11 . The liquid-vapor separation device of  claim 6 , wherein the said inner tube is a tube bundle composed of a plurality of spiral inner tubes. 
     
     
         12 . The liquid-vapor separation device of  claim 6 , wherein the inner tube is a single tube. 
     
     
         13 . The liquid-vapor separation device of  claim 8 , wherein an inner wall of the said inner tube has inner threads or micro-grooves, a surface of the said inner threads or micro-grooves is covered with a porous layer formed by sintering a plurality of layers of screens and metal or non-metal particles. 
     
     
         14 . The liquid-vapor separation device as set forth in  claim 6 , wherein an inner wall of said outer tube has a porous layer formed by sintering a plurality of layers of screens and metal or non-metal particles.