CN110812867B

CN110812867B - Climbing film evaporator

Info

Publication number: CN110812867B
Application number: CN201911055929.3A
Authority: CN
Inventors: 贾磊; 马晓静; 魏双清
Original assignee: Shandong Ward Water Purification Technology Co ltd
Current assignee: Shandong ward water purification technology Co.,Ltd.
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2022-01-07
Anticipated expiration: 2039-10-31
Also published as: CN110812867A

Abstract

The invention relates to the technical field of evaporators, and discloses a climbing film evaporator, which comprises a cylinder wall, wherein the climbing film evaporator is characterized in that the top of a traditional heating pipe is arranged into a heating pipe with a smaller diameter, so that a film-shaped fluid brought by a steam column is more gathered in a section of the heating pipe with a smaller diameter, the thickness of the film-shaped fluid formed by a raw material liquid after evaporation at the lower part is gradually reduced due to higher steam temperature at the top, when the film-shaped fluid enters the heating pipe with a smaller diameter at the upper part, the thinned or broken edge of the film-shaped fluid can be reunited by the diameter reduction of the raw material liquid to form a complete film-shaped fluid, so that the phenomenon of 'dry wall' is automatically solved, and even if the steam quantity is too much controlled or the supply quantity of the raw material liquid is too little by misoperation, the phenomenon of 'dry wall' can be automatically avoided to the greatest extent by the reduction of the diameter of the heating pipe, the manpower requirement of this evaporimeter during operation has been reduced, the reliability of device has also been improved.

Description

Climbing film evaporator

Technical Field

The invention relates to the technical field of evaporators, in particular to a climbing film evaporator.

Background

The climbing-film evaporator feeds in raw material liquid preheated to be close to a boiling point from a feed inlet at the bottom of the evaporator, heating steam introduced from the outside heats a heating pipe in the heating chamber, so that the raw material liquid reaches the boiling point, steam generated by boiling forms a steam column at the center of the heating pipe, the steam column enables the boiling raw material liquid to form a film-shaped fluid on one side along the inner wall of the heating pipe to ascend, and when the boiling raw material liquid reaches the top, the steam takes the raw material liquid to enter a separator for gas-liquid separation after passing through a demister to complete concentration of the raw material liquid, but the existing climbing-film evaporator always has some problems:

1. the steam column of present climbing film evaporator is continuously heating through steam in the in-process that drives raw material liquid and rises, because the draw ratio of heating pipe is between one hundred to one hundred fifty, but present heating pipe is the straight tube that the diameter is the same from last down, and if the volume control to the temperature of steam and feeding is not good, will produce the damage to the evaporimeter, especially raw material liquid supply volume is too little or steam temperature is too high, the steam volume that can make heating pipe inner wall produce is greater than the volume that steam left heating pipe inner wall, steam will form the big bubble at heating pipe inner wall gathering, the inner wall has been covered even, make liquid can not wet the inner wall, produce the phenomenon of "dry wall" at the heating pipe top simultaneously, and the control of this kind of volume needs the artificial real-time observation again, it is comparatively inconvenient.

2. The heating steam inlet of current climbing film evaporator sets up the middle part at the heating chamber, but because the rising effect of hot steam, set up the entry in the middle part, the temperature of upper portion is too high in the messenger heating pipe, and the temperature of bottom is crossed lowly, but the principle of this evaporimeter is exactly to the raw materials liquid heating to the boiling of the heating pipe of near boiling point through the bottom, make the gas that its produced slowly form the steam column and drive raw materials liquid and rise, and the time that the raw materials liquid reachs the boiling just influences very much if the bottom temperature is too low, thereby influence the work efficiency of evaporimeter greatly, heating steam directly strikes the outer wall of heating pipe simultaneously, will make the outer wall attenuation of heating pipe after using for a long time, accelerate its ageing speed, reduce the life of evaporimeter.

Disclosure of Invention

The invention provides a climbing film evaporator which has the advantages of high boiling speed, long service life and good evaporation effect and solves the problems in the background technology.

The invention provides the following technical scheme: the utility model provides a rise membrane evaporator, includes the section of thick bamboo wall, the upper portion fixed mounting of section of thick bamboo wall one side has the gas-liquid discharge gate, the bottom fixed mounting of section of thick bamboo wall one side has raw material liquid feed inlet, the bottom fixed mounting of section of thick bamboo wall has the comdenstion water delivery port, the opposite side fixed mounting of section of thick bamboo wall bottom has the heating steam entry, the inside fixed mounting of section of thick bamboo wall has the heating pipe, the top fixed mounting of heating pipe has the filter, the bottom fixed mounting of heating pipe has the guard plate.

Preferably, the heating steam inlet is installed at the same height as the bottom of the internal heating chamber.

Preferably, the upper part of the heating tube has a smaller diameter than the lower part and a smaller diameter, which is one quarter of the length of the heating tube.

Preferably, the filter includes first filter screen and second filter screen, the filter is formed by first filter screen and the stack of second filter screen in turn, the bottom integration of first filter screen and second filter screen is equipped with the pawl, the shape of pawl is inverted triangle-shaped and wherein a corner is perpendicular downwards, first filter screen and second filter screen are the mesh filter screen that complementary packing has the panel each other on two planes.

Preferably, the shielding plate is formed in a semicircular shape and is installed at a side where the steam enters the heating chamber.

The invention has the following beneficial effects:

1. the climbing-film evaporator is characterized in that the top of a traditional heating pipe is arranged to be the heating pipe with a smaller diameter, so that film-shaped fluid brought by a steam column is gathered in a section of the heating pipe with a smaller diameter, the heating pipe with a larger diameter at the bottom can normally heat and boil raw material liquid, meanwhile, because the steam temperature at the top is higher, the thickness of the film-shaped fluid formed by the raw material liquid after the evaporation at the lower part is gradually thinned, when the film-shaped fluid enters the heating pipe with a smaller diameter at the upper part, the thinned or even broken edge of the film-shaped fluid can be gathered again to form complete film-shaped fluid due to the reduction of the diameter, so that the phenomenon of 'dry wall' can be automatically solved, and even if the steam amount is too much controlled or the supply amount of the raw material liquid is too little due to misoperation, the phenomenon of 'dry wall' can be automatically avoided to the greatest extent by the reduction of the diameter of the heating pipe, the manpower requirement of this evaporimeter during operation has been reduced, the reliability of device has also been improved.

2. This rise membrane evaporator, through setting up the bottom at the heating chamber with the heating steam entry, not only can make the heating pipe of bottom receive high temperature steam, guaranteed to be close the raw materials liquid of boiling can rapid heating to boiling, thereby quick gassing, improve the speed that forms the steam column, thereby improve the work efficiency of evaporimeter, simultaneously again because the steam on upper portion reduces to sink to the bottom carrying out heat exchange back temperature, and the heating steam entry is just in the bottom, can in time supply the heat, guarantee that the temperature of bottom maintains the point that can rapid heating to boiling all the time, combine to set up the guard plate in steam intlet's place simultaneously, can avoid steam directly to strike the heating pipe, reduce the damage of heating pipe, prolong its life, and the use cost is reduced.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic top view of a first screen in accordance with the present invention;

FIG. 3 is a schematic top view of a second screen according to the present invention;

FIG. 4 is a schematic side view of a first screen of the present invention;

FIG. 5 is a schematic top view of the connection between the heating tube and the protection plate according to the present invention.

In the figure: 1. a cylinder wall; 2. a gas-liquid discharge port; 3. a raw material liquid feeding port; 4. a condensed water outlet; 5. A heating steam inlet; 6. heating a tube; 7. a filter; 71. a first filter screen; 72. a second filter screen; 73. Chamfering; 8. and (4) a protective plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, a climbing-film evaporator includes a cylinder wall 1, a gas-liquid discharge port 2 is fixedly installed at the upper portion of one side of the cylinder wall 1, a raw material liquid feed port 3 is fixedly installed at the bottom of one side of the cylinder wall 1, a condensed water outlet 4 is fixedly installed at the bottom of the cylinder wall 1, a heating steam inlet 5 is fixedly installed at the other side of the bottom of the cylinder wall 1, a heating pipe 6 is fixedly installed inside the cylinder wall 1, a filter 7 is fixedly installed at the top of the heating pipe 6, and a protection plate 8 is fixedly installed at the bottom of the heating pipe 6.

Wherein, the installation position of the heating steam inlet 5 is as high as the bottom of the internal heating chamber, and the heating steam is sent by installing the heating steam inlet 5 at the position, so that not only can the raw material liquid entering from the raw material liquid inlet 3 at the bottom and approaching boiling be rapidly heated and boiled, and the steam efficiency generated by the device is improved, meanwhile, due to the rising effect of the steam, the heat in the whole heating chamber is higher and higher from bottom to top by feeding the steam from the bottom, thus being beneficial to carrying out full heat absorption evaporation on the liquid to be evaporated in the raw material liquid, improving the effect of single evaporation, and send into heating steam from the bottom and also can supply the bottom to carry out the steam that the heat reduces after the heat exchange very first time, guarantee that the temperature of bottom maintains throughout can make the point that the rapid heating of feed liquid boils, and the heat distribution in the heating chamber is rationalized more.

Wherein, the diameter of the upper part of the heating pipe 6 is smaller than the diameter of the lower part and the smaller diameter occupies one fourth of the length of the whole heating pipe 6, because the raw material liquid in the heating pipe 6 is heated and boiled and then the ascending steam column drives the film-shaped fluid on the inner wall to ascend, and the heating pipe is continuously heated in the process, the heating pipe 6 with the smaller diameter arranged at the top can lead the film-shaped fluid with the gradually reduced thickness to be gathered in the ascending process, thereby increasing the thickness of the film-shaped fluid, well solving the problem that the film of the film-shaped fluid is broken due to overlong heating time when the raw material liquid ascends to the top close to the heating pipe 6, leading the steam column to cover the inner wall of the heating pipe 6, thereby generating the problem of 'dry wall', and the smaller pipe diameter can increase the flow velocity of the gas-liquid mixture in the inner part, which can be filtered and defoamed by the filter 7 with high efficiency subsequently, and simultaneously setting the length as one fourth of the total length can realize that the raw material liquid can be filtered and evaporated before the raw material liquid is not completely The aggregation of the feed liquid further avoids the occurrence of the phenomena, ensures the normal production operation of the equipment and prolongs the service life of the equipment.

Wherein, the filter 7 comprises a first filter screen 71 and a second filter screen 72, the filter 7 is formed by alternately overlapping the first filter screen 71 and the second filter screen 72, the bottoms of the first filter screen 71 and the second filter screen 72 are integrally provided with inverted teeth 73, the inverted teeth 73 are in the shape of inverted triangle, one corner of the inverted teeth is vertical downward, the first filter screen 71 and the second filter screen 72 are two mesh filter screens which are mutually complemented and filled with panels on two planes, the inverted teeth 73 at the bottom of one filter screen are arranged at the upper part of the lower filter screen by alternately overlapping the first filter screen 71 and the second filter screen 72, the inverted triangle shape of the inverted teeth 73 can ensure that the gas in the enterprise mixture can upwards penetrate along the inclined plane of the inverted teeth 73, and the liquid can change the traveling path route thereof due to the panel which is complementarily filled in the first filter screen 71 and the second filter screen 72, and the liquid is blocked on the inclined plane of the inverted teeth 73, then flows down along the inclined plane, not only the effect of gas-liquid filtration and separation is realized, but also the blocked liquid can be used for supplementing the liquid in the heating pipe 6 with smaller pipe diameter, and the phenomenon of 'dry wall' is further avoided.

Wherein, the shape of guard plate 8 is semi-circular and installs in the one side that is located steam entering heating chamber, through install guard plate 8 on heating pipe 6, can be guaranteeing that heating pipe 6 can be normal to wherein raw materials liquid heat to the boiling in, prevent that steam from directly assaulting the outer wall of heating pipe 6, because contain moisture in the steam, the direct impact can be under the high temperature condition the corruption of 6 pipe walls of accelerated heating pipe, the life of extension heating pipe 6 that can be fine through guard plate 8, the use cost of reduction equipment.

The theory of operation, let in the raw materials liquid of nearly boiling to the heating chamber bottom through raw materials liquid feed inlet 3, through the inside injection heating steam of heating steam entry 5 to the heating chamber, steam diffuses to the heating chamber through guard plate 8, the raw materials liquid of bottom produces the bubble in heating pipe 6 after the heating boiling, along with rising in heating pipe 6, steam slowly forms the steam column, it forms membranous fluid to drive raw materials liquid, then through the heating pipe 6 that the upper portion pipe diameter diminishes, then pass through filter 7, the gas-liquid mixture body that comes out at last goes out through gas-liquid discharge gate 2, and condensate wherein discharges from the bottom through comdenstion water delivery port 4.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a rise membrane evaporator, includes section of thick bamboo wall (1), the upper portion fixed mounting of section of thick bamboo wall (1) one side has gas-liquid discharge gate (2), the bottom fixed mounting of section of thick bamboo wall (1) one side has raw materials liquid feed inlet (3), the bottom fixed mounting of section of thick bamboo wall (1) has comdenstion water delivery port (4), its characterized in that: the heating device is characterized in that a heating steam inlet (5) is fixedly mounted on the other side of the bottom of the cylinder wall (1), a heating pipe (6) is fixedly mounted inside the cylinder wall (1), a filter (7) is fixedly mounted at the top of the heating pipe (6), a protection plate (8) is fixedly mounted at the bottom of the heating pipe (6), one section of the upper portion of the heating pipe (6) with a smaller diameter than the lower portion occupies one fourth of the length of the whole heating pipe (6), the filter (7) comprises a first filter screen (71) and a second filter screen (72), the filter (7) is formed by alternately overlapping the first filter screen (71) and the second filter screen (72), inverted teeth (73) are integrally arranged at the bottoms of the first filter screen (71) and the second filter screen (72), the inverted teeth (73) are in the shape of an inverted triangle and are vertically downward at one corner, the first filter screen (71) and the second filter screen (72) are grids which are mutually complementary and are filled with panels on two planes Filtering with a screen; through the alternate stack of first filter screen (71) and second filter screen (72), set up pawl (73) of one of them filter screen bottom in the upper portion of filter screen below, utilize the inverted triangle shape of pawl (73), can guarantee that gas in the gas-liquid mixture can upwards wear out along the inclined plane of pawl (73), and liquid can be because the panel of complementary packing in first filter screen (71) and second filter screen (72) changes its path of travel extremely fast, liquid is blockked on the inclined plane of pawl (73), then flows down along its inclined plane, the effect of gas-liquid filtration separation has not only been realized, can also make the liquid that blocks in the less heating pipe of liquid supply pipe diameter (6), further avoid the phenomenon of dry wall.

2. A climbing film evaporator according to claim 1, wherein: the installation position of the heating steam inlet (5) is as high as the bottom of the internal heating chamber; the protection plate (8) is semicircular in shape and is arranged on one side of the steam inlet heating chamber; through installing guard plate (8) on heating pipe (6), guarantee that heating pipe (6) can be normal to wherein raw material liquid heat to the boiling in, prevent that steam from directly impacting the outer wall of heating pipe (6), because contain moisture in the steam, the corruption of direct impact can accelerating heating pipe (6) pipe wall under the condition of high temperature.