CN107744670A - A kind of evaporator - Google Patents

Abstract

The invention relates to an evaporator in the field of chemical industry, which comprises a vertical conical casing with a downward cone angle, the large port of the vertical conical casing is connected with an equal-diameter cylinder, and the upper end of the equal-diameter cylinder is There is a steam outlet, and the small port of the vertical conical shell is connected with a conical bottom with a cone angle larger than that of the vertical conical shell. The bottom of the conical bottom has a concentrated liquid outlet, and there are raw materials on the side The liquid inlet pipe, the vertical conical shell is equipped with a conical coil with a downward cone angle, and the upper end of the conical coil is connected to the heat carrier inlet pipe on the upper outside of the vertical conical shell , the lower end interface of the conical coil is connected to the heat carrier outlet pipe at the lower outside of the vertical conical casing. In the present invention, through the cooperation between the conical coil and the vertical conical shell and the relative relationship between them, the raw material liquid can be formed around the conical coil of the heat carrier from the central heating area to continuously rise, and the peripheral heating area is continuously downward and downward. The relatively strong natural convection state flowing to the central area can promote the full natural circulation of the raw material liquid, which can greatly improve the evaporation efficiency.

Description

an evaporator

technical field

The invention relates to the field of chemical industry, in particular to an evaporator.

Background technique

At present, the evaporators used in the chemical industry are mostly circulation evaporators and film evaporators. There are two types of circulating evaporators: natural circulation and forced circulation. The natural circulation is mostly vertical natural circulation. At this time, if the heat transfer tubes are arranged vertically, the laminar layer on the heat transfer surface will not be damaged much, thus affecting the heat transfer. Thermal efficiency. In view of this deficiency, the present invention proposes to promote the natural circulation of the raw material liquid in multiple directions such as vertical and horizontal along the wall surface of the heat transfer tube through the structural design of the inner and outer vertical conical shells and the coil tube, which can greatly Improve evaporation efficiency.

Contents of the invention

The object of the present invention is to solve the problem of natural convection intensity in the circulating evaporator, and provide a new type of evaporator with high concentration efficiency, good effect, detachable and convenient maintenance.

In order to achieve the above object, the present invention can take the following technical solutions:

An evaporator, comprising a vertical conical casing with a downward cone angle, the large port of the vertical conical casing is connected with an equal-diameter cylinder, the upper end of the equal-diameter cylinder has a steam outlet, the The small port of the vertical conical shell is connected with a conical bottom with a larger cone angle than that of the vertical conical shell. The bottom of the conical bottom has a concentrated liquid outlet and a raw material liquid inlet pipe on the side. A conical coil with a downward cone angle is installed inside the vertical conical shell, the upper end of the conical coil is connected to the heat carrier inlet pipe on the upper outside of the vertical conical shell, and the conical coil The lower end interface of the tube is connected with the heat carrier outlet tube at the lower outside of the vertical conical shell.

Preferably, a foam barrier is installed in the equal diameter cylinder, and the foam barrier is separated from an air outlet, and the foam barrier is placed obliquely, and the angle formed with the horizontal plane is 15-45 degrees.

Preferably, the cone angle of the vertical cone shell is 15-30% larger than the cone angle of the coiled pipe.

Preferably, at the height of the conical coil, within 40% or 70% of the top of the conical coil, the distance between the conical surface of the conical coil and the inner side of the conical surface of the vertical conical shell is conical disk 3 to 5 times the diameter of the tube; within 50% to 100% of the top of the conical coil, the distance between the conical surface of the conical coil and the inside of the conical surface of the vertical conical shell is 0.5 times the diameter of the conical coil ~2 times.

Preferably, the tube distance of the conical coil is within 60% or 80% of the top of the entire height of the conical coil, and the tube distance of the conical coil is 0.5 to 2 times its tube diameter; In the range of 50% to 100%, the pipe distance of the conical coil is 1 to 2 times the pipe diameter.

Preferably, at the largest conical coil diameter, the conical coil horizontal plane circle area accounts for 60% to 95% of the shell inner circle area at the same horizontal position; at the smallest conical coil diameter, the conical coil horizontal plane circle The area accounts for 65% to 90% of the inner area of the shell at the same horizontal position.

Preferably, the raw material liquid inlet pipe is composed of a vertical section and a horizontal section, and the outlet end of the vertical section rises vertically to the bottom of the coil tube, and the rising distance is 0.5 to 1.5 times the diameter of the bottom of the coil tube.

After the above measures are taken, the middle part of the evaporator of the present invention constitutes the heating area, the bottom constitutes the concentrated liquid collection area and the upper part constitutes the gas collection area. The vertical conical shell and the conical coil form the conical coil. The central heating zone and the peripheral heating zone between the outside of the conical coil and the vertical conical shell. By arranging the cooperation between the conical coil and the vertical conical shell and the relative relationship between them, the raw material liquid can surround the heat carrier conical coil and rise continuously from the central heating area, while the surrounding heating area continues downward and upward. The relatively strong natural convection state flowing in the central area can promote the full natural circulation of the raw material liquid, which can greatly improve the evaporation efficiency. The conical coil is detachable for easy maintenance.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

In the figure, 1 vertical conical shell, 2 heat carrier inlet pipe, 3 steam outlet, 4 foam baffle, 5 equal diameter cylinder, 6 gas outlet, 7 conical coil, 8 heat carrier outlet pipe, 9 vertical section, 10 cone bottom, 11 concentrated liquid outlet, 12 horizontal section, 13 raw material liquid inlet pipe.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to Fig. 1, a kind of evaporator provided by the present invention comprises a vertical conical casing 1 with a cone angle downwards, the large port of the vertical conical casing 1 is connected with an isometric cylinder 5, the There is a steam outlet 3 at the upper end of the equal-diameter cylinder 5, and the small port of the vertical conical casing 1 is connected with a conical bottom 10 with a cone angle larger than that of the vertical conical casing, and the conical bottom 10 Concentrated liquid outlet 11 is arranged at the bottom of the bottom, and raw material liquid inlet pipe 13 is arranged on the side, and the conical coil pipe 7 that taper angle is downwards is installed in described vertical conical housing 1, and the upper end interface of described conical coil pipe 7 is connected with all The heat carrier inlet pipe 2 on the outer upper part of the vertical conical shell 1 is connected, and the lower end interface of the conical coil pipe 7 is connected to the heat carrier outlet pipe 8 on the outer lower part of the vertical conical shell 1 .

The isodiametric cylinder 5 is equipped with a foam barrier 4, and the foam barrier 4 is separated from an air outlet 6. The foam barrier 4 is placed obliquely, and the angle formed with the horizontal plane is 20 degrees.

The cone angle of the vertical conical shell is 25% larger than the cone angle of the coil.

At the height of the conical coil, within 40% of the top of the conical coil, the distance between the conical surface of the conical coil and the inside of the conical surface of the vertical conical shell is 4 times the diameter of the conical coil; Within 60% of the top of the conical coil, the distance between the conical surface of the conical coil and the inside of the conical surface of the vertical conical shell is 1 times the diameter of the conical coil.

The pipe distance of the conical coil is within the range of 60% or 80% from the top of the entire height of the conical coil, and the pipe distance of the conical coil is 0.5 to 2 times its pipe diameter; % range, the distance between conical coils is 1 to 2 times its diameter.

At the largest conical coil diameter, the conical coil horizontal plane circle area accounts for 60% to 95% of the shell inner circle area at the same horizontal position; at the minimum conical coil diameter, the conical coil horizontal plane circular area occupies the same level 65% to 90% of the inner area of the housing.

The raw material liquid inlet pipe is composed of a vertical section and a horizontal section. The outlet end of the vertical section rises vertically to the bottom of the coil, and the rising distance is 1 times the diameter of the bottom of the coil.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (7)

1. A kind of evaporator, it is characterized in that, comprise the vertical conical housing of a taper angle downwards, the large port of described vertical conical housing is connected with an equal-diameter cylinder, the upper end of the equal-diameter cylinder There is a steam outlet, and the small port of the vertical conical shell is connected with a conical bottom with a cone angle larger than that of the vertical conical shell. The bottom of the conical bottom has a concentrated liquid outlet, and there are raw materials on the side The liquid inlet pipe, the vertical conical shell is equipped with a conical coil with a downward cone angle, and the upper end of the conical coil is connected to the heat carrier inlet pipe on the upper outside of the vertical conical shell , the lower end interface of the conical coil is connected to the heat carrier outlet pipe at the lower outside of the vertical conical casing. 2. A kind of evaporator according to claim 1, characterized in that, a foam barrier baffle is installed in the isometric cylinder, and the foam barrier is separated from an air outlet, and the foam barrier is Place it obliquely, and the angle formed with the horizontal plane is 15-45 degrees. 3 . The evaporator according to claim 1 , wherein the cone angle of the vertical cone shell is 15-30% larger than the cone angle of the coil. 4 . 4. A kind of evaporator according to claim 1, characterized in that, on the height of the conical coil, within 40% or 70% of the top of the conical coil, the conical surface of the conical coil and the vertical cone The distance between the inside of the conical surface of the conical shell is 3 to 5 times the diameter of the conical coil; within the range of 50% to 100% from the top of the conical coil, the conical surface of the conical coil and the cone of the vertical conical shell The distance between the inner sides of the faces is 0.5 to 2 times the diameter of the conical coil. 5. A kind of evaporator according to claim 1, characterized in that, the distance between the tubes of the conical coil is within the range of 60% or 80% from the top of the entire height of the conical coil, and the distance between the tubes of the conical coil The distance is 0.5 to 2 times the pipe diameter; within the range of 50% to 100% from the top, the pipe distance of the conical coil is 1 to 2 times the pipe diameter. 6. An evaporator according to claim 1, characterized in that, at the maximum diameter of the conical coil, the circular area of the horizontal surface of the conical coil accounts for 60% to 95% of the inner circle area of the shell at the same horizontal position; At the minimum diameter of the conical coil, the horizontal area of the conical coil accounts for 65% to 90% of the inner area of the shell at the same horizontal position. 7. A kind of evaporator according to claim 1, characterized in that, the raw material liquid inlet pipe is composed of a vertical section and a horizontal section, and the outlet end of the vertical section vertically rises into the bottom of the coil tube, and the distance of rising is 100°C at the bottom of the coil tube. 0.5 to 1.5 times the diameter.