CN110711395B

CN110711395B - Central circulation tubular evaporator

Info

Publication number: CN110711395B
Application number: CN201910891616.5A
Authority: CN
Inventors: 莫丽婵; 陈哲
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2021-06-22
Anticipated expiration: 2039-09-20
Also published as: CN110711395A

Abstract

The invention relates to the technical field of evaporators and discloses a central circulating tube type evaporator which comprises a tube wall, wherein a traditional circular heating tube bundle of the central circulating tube type evaporator is changed into a hexagonal heat exchange wall, the heat exchange wall is gradually reduced from the tube wall to the direction of a central circulating tube, a hexagonal solution heating bin a changes a traditional cylindrical heating tube and increases the volume of the solution heating bin a, the shape of the bin is regular, the later-period cleaning of the solution heating bin a is greatly facilitated, the solution heating bin a consisting of adjacent heat exchange walls greatly increases the solution bearing capacity compared with the existing circular heating tube, a heating steam bin b surrounding the outer side of the solution heating bin a is utilized for heating the solution heating bin, and the solution can absorb more heat and the heat in the solution is not saturated through the rapid heat exchange between large-capacity solutions, the heat exchange efficiency of the single-cycle heating steam bin b is increased, and the efficiency of the evaporator is increased.

Description

Central circulation tubular evaporator

Technical Field

The invention relates to the technical field of evaporators, in particular to a central circulating tube type evaporator.

Background

The central circulating tube type evaporator generally comprises an evaporation chamber and a heating chamber, wherein the heating chamber is a shell-and-tube heat exchanger generally and comprises an upper tube plate, a lower tube plate and a vertical heating tube bundle, a thicker central circulating tube is arranged in the center of the tube bundle, and the working principle of the central circulating tube type evaporator is as follows: the heated area of unit volume solution is greater than the heated area in the circulating pipe in the heating tube bank, and the solution in the heating tube bank is heated effectually like this, and solution vaporization is many, and consequently the solution in the heating tube bank contains the gas quantity height for its density is less than the solution density in the central circulating pipe, and this kind of density difference makes and makes the solution downstream in the central circulating pipe, and the solution rebound in the heating tube bank, thereby has realized the self-loopa of inside solution, but current central circulating tubular evaporator has following problem all the time:

1. the heating tube bank of current central circulation tubular evaporator comprises numerous cylinder heating pipe, and because the restriction of its heating tube shape, there is certain distance between the adjacent heating pipe in addition, lead to the heat of the central part heating steam in space between the adjacent heating pipe can not abundant utilization, in addition because the solution volume undersize that single heating tube bank held, heat exchange rate reduces by a wide margin after having absorbed the peripheral steam heat of heating pipe, make the heat at center need the recirculation just can utilize, in addition, the speed of transmitting heat through the heating pipe in to solution is less than the direct heat transfer speed between solution, too much circular heating pipe can make the heat exchange efficiency of evaporimeter reduce, the time of evaporation has been prolonged.

2. The heating tube bundle of the existing central circulating tube evaporator is composed of a plurality of round heating tubes with smaller diameters, but due to the fact that the diameters of the heating tube bundles are too small, dirt generated after solution is heated and flows for a long time in the heating tube bundle can be adhered to the inside of the heating tube bundle, and the cleaning is particularly inconvenient, so that the difficulty of a cleaning procedure in the later period is increased.

3. The heating steam import of current central authorities' circulation tubular evaporator is located the upper portion of heating chamber, but because hot steam has climbing effect, set up the import in the upper portion and make the most upper portions of gathering at the heating chamber of hot steam, and the bottom all is the steam that the sunken temperature is low after the cooling, it heats solution to have led to whole heating chamber majority condition all to lean on a short distance at top like this, the effect of preheating of bottom is poor in the heating pipe, cause the solution temperature after rising at the back to hang down, can not produce a large amount of steam through very fast short distance heating, the cycle number of times of solution heating has been increased, the efficiency of evaporation has been reduced.

Disclosure of Invention

The invention provides a central circulating tube type evaporator which has the advantages of high evaporation efficiency and easiness in cleaning and solves the problems in the background technology.

The invention provides the following technical scheme: the utility model provides a central circulation tubular evaporator, includes the section of thick bamboo wall, one side fixed mounting of section of thick bamboo wall has the feed inlet, the bottom fixed mounting of section of thick bamboo wall has the completion liquid export, the opposite side fixed mounting of section of thick bamboo wall has steam inlet, the inner wall of section of thick bamboo wall has the heat exchange wall through connecting rod fixed mounting, the top fixed mounting of heat exchange wall has the top cap, the bottom fixed mounting of heat exchange wall has the bottom, the inside fixed mounting of heat exchange wall has central circulation pipe, the center fixed mounting of central circulation pipe has the shunt, the bottom fixed mounting of heat exchange wall has the steam transmission pipe.

Two adjacent heat exchange walls form a solution heating bin a, and two adjacent heat exchange walls combine a top cover at the top and a bottom cover and a steam transmission pipe at the bottom to form a heating steam bin b.

Preferably, the heat exchange wall is in the shape of a regular hexagon and gradually decreases from the cylinder wall to the direction of the central circulation pipe.

Preferably, the steam inlet is arranged on the outer side of the bottom cylinder wall of the heating chamber and is communicated with the heating steam bin b through a steam transmission pipe.

Preferably, the diverter is in the shape of a herringbone and has the same length of the upper portion as the inner diameter of the central circulation tube.

The invention has the following beneficial effects:

1. this central circulation tubular evaporator, be hexagonal heat exchange wall through changing traditional circular heating tube bank, and dwindle gradually to the direction heat exchange wall of central circulation pipe by the section of thick bamboo wall, combine top cap and bottom formation heating steam storehouse b and constitute solution heating storehouse an between the adjacent heat exchange wall, this hexagonal solution heating storehouse a has changed traditional cylindrical heating pipe, greatly increased solution heating storehouse a's volume, and the shape in this storehouse is regular, very big make things convenient for the washing of later stage to solution heating storehouse a, and solution heating storehouse a that adjacent heat exchange wall is constituteed compares current circular heating pipe greatly increased the bearing capacity of solution, utilize to encircle heating steam storehouse b in solution heating storehouse an outside and heat it, through the quick heat exchange between the solution of inside large capacity, thereby guarantee that solution can be quick absorption heating steam storehouse b is passed through the heat that the heat exchange wall transmission comes and the inside hot heat of solution The amount does not reach saturation, can continue to absorb the heat that heating steam storehouse b transmitted, has increased the heat exchange efficiency of single circulation heating steam storehouse b, has improved thermal single utilization ratio, has also reduced the number of times of circulation simultaneously, has increased the efficiency of evaporimeter.

2. The central circulating tube type evaporator is characterized in that a steam inlet is arranged at the bottom of a heating chamber, heating steam entering from the steam inlet is fully diffused to the bottom of each layer of heating steam bin b by a steam transmission tube in the heating steam bin b, the steam automatically climbs upwards by utilizing the climbing effect of the steam, a part of the hot steam can climb to the top of the heating steam bin b, superheated steam starts to heat solution from the bottom of a solution heating bin a, the cooled steam is rapidly supplemented by the heating steam in the steam transmission tube after sinking, redundant hot steam continues to climb upwards, the solution at the top can further increase the temperature of the solution going out of a solution heating bin a, the rate of forming bubbles in the solution at the position is increased, and the water outlet position of a central circulating tube is divided into two halves by combining a flow divider to increase the rate of single-side water outlet, the self-circulation speed of the solution in the whole evaporator is greatly improved, and the heat distribution of the whole heating steam bin b is from the high heat all the time up to down, so that the solution can be heated in a whole course in the process of the solution heating bin a in a high efficiency manner, and the working efficiency of the evaporator is improved.

Drawings

FIG. 1 is a schematic cross-sectional front view of the present invention;

FIG. 2 is a schematic view of A-A in FIG. 1 according to the present invention.

In the figure: 1. a cylinder wall; 2. a feed inlet; 3. a steam inlet; 4. a finishing liquid outlet; 5. a central circulation tube; 6. a heat exchange wall; 7. a top cover; 8. a bottom cover; 9. a flow divider; 10. a steam transmission pipe.

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. 1-2, a central circulation tube evaporator includes a tube wall 1, a feed inlet 2 is fixedly installed at one side of the tube wall 1, a finishing liquid outlet 4 is fixedly installed at the bottom of the tube wall 1, a steam inlet 3 is fixedly installed at the other side of the tube wall 1, a heat exchange wall 6 is fixedly installed at the inner wall of the tube wall 1 through a connecting rod, a top cover 7 is fixedly installed at the top of the heat exchange wall 6, a bottom cover 8 is fixedly installed at the bottom of the heat exchange wall 6, a central circulation tube 5 is fixedly installed inside the heat exchange wall 6, a flow divider 9 is fixedly installed at the center of the central circulation tube 5, and a steam transmission tube 10 is fixedly installed.

Two adjacent heat exchange walls 6 form a solution heating chamber a, and two adjacent heat exchange walls 6 combine with a top cover 7 at the top and a bottom cover 8 and a steam transmission pipe 10 at the bottom to form a heating steam chamber b.

Wherein, the shape of the heat exchange wall 6 is regular hexagon and gradually reduces from the cylinder wall 1 to the direction of the central circulation pipe 5, which changes the traditional cylindrical heating pipe to be the regular hexagon heat exchange wall 6, so that the solution bearing capacity of the solution heating bin a is increased, on one hand, the space of the solution heating bin a is hexagonal ring, which changes the traditional tiny cylindrical heating pipe, so that the ring heating bin is more convenient to clean, on the other hand, when the solution absorbs the heat transferred from the heating steam bin b from the heat exchange wall 6, enough solution can exchange heat between solutions in the solution heating bin a, so that the solution absorbing heat can transfer a part of heat to the solution which does not absorb heat in the middle, so as to promote the solution to absorb heat from the heat exchange wall 6 again, thereby increasing the transfer efficiency of single circulation heat, and making the solution evaporate bubbles faster, thereby improving the working efficiency of the evaporator.

Wherein, the steam inlet 3 is arranged at the outer side of the bottom cylinder wall 1 of the heating chamber and is communicated with the heating steam bin b through a steam transmission pipe 10, after the heating steam enters the heating steam bin b from the steam inlet 3 and is diffused, the steam can climb to the top of the heating steam bin b due to the climbing action of the steam, so that the temperature at the top is higher, the bottom of the heating steam bin b is supplemented with the steam through the steam inlet 3 all the time, so the heat at the bottom is also very high, when the solution rises from the bottom of the solution heating bin a, the solution can be rapidly heated by the high-temperature steam supplemented at the bottom, the heat from the bottom to the top of the heating steam bin b gradually rises, the solution can be gradually heated in the rising process, and the solution can be finally raised to the vaporization temperature by the steam with the highest temperature at the top when the solution reaches the top, the solution vaporization rate of the cover evaporator is increased, the cycle number required by unit solution vaporization is reduced, and the working efficiency of the evaporator is further improved.

Wherein, the shape of shunt 9 is the herringbone and its upper portion's length is the same with the internal diameter of central circulation pipe 5, when circulating solution from the top down moves to the lower part of central circulation pipe 5 in central circulation pipe 5, divide into two the same parts about with solution wherein through the reposition of redundant personnel effect of shunt 9, make the aperture that passes through of solution reduce, because the same circulation power, the reduction of aperture can make the solution velocity of flow through this aperture increase, and combine chevron shape's design, make the solution of central circulation pipe 5 exit buffer to the inner wall of section of thick bamboo wall 1 along smooth flow distribution plate, reduce the circulation power that the straight face strikes the loss, increase the velocity of flow of solution, improve the work efficiency of evaporimeter once more.

The working principle is that the solution to be evaporated is introduced from the feed inlet 2, after the heating chamber is filled with the solution, the heating steam is introduced from the steam inlet 3, the steam is diffused into each layer of heating steam bin b through the steam transmission pipe 10, the steam is in heat transfer with the solution in the solution heating chamber a through the heat exchange wall 6, when the temperature of the solution reaches a certain value, bubbles are generated in the solution heating chamber a, so that the density of the solution in the solution heating chamber a is reduced, the solution density in the central circulation pipe 5 will be higher than that in the solution heating chamber a, so that the solution is heated in the heating chamber by self-circulation, and when the solution reaches the bottom of the central circulation pipe 5, the solution is accelerated and changed in direction when passing through the path formed by the inner wall of the central circulation pipe 5 and the flow divider 9, and the gas generated in the solution heating chamber a is discharged from the top of the evaporator.

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 central authorities' circulation tubular evaporator, includes section of thick bamboo wall (1), one side fixed mounting of section of thick bamboo wall (1) has feed inlet (2), the bottom fixed mounting of section of thick bamboo wall (1) has completion liquid export (4), its characterized in that: the steam inlet (3) is fixedly installed on the other side of the cylinder wall (1), a heat exchange wall (6) is fixedly installed on the inner wall of the cylinder wall (1) through a connecting rod, a top cover (7) is fixedly installed on the top of the heat exchange wall (6), a bottom cover (8) is fixedly installed at the bottom of the heat exchange wall (6), a central circulating pipe (5) is fixedly installed inside the heat exchange wall (6), the heat exchange wall (6) is in a regular hexagon shape and gradually reduces from the cylinder wall (1) to the central circulating pipe (5), a flow divider (9) is fixedly installed at the center of the central circulating pipe (5), the flow divider (9) is in a herringbone shape, the length of the upper portion of the flow divider is the same as the inner diameter of the central circulating pipe (5), and a steam conveying pipe (10) is fixedly installed at the bottom;

two adjacent heat exchange walls (6) form a solution heating bin a, and two adjacent heat exchange walls (6) combine a top cover (7) at the top and a bottom cover (8) at the bottom and a steam transmission pipe (10) to form a heating steam bin b.

2. A central circulating tube evaporator as set forth in claim 1 wherein: the steam inlet (3) is arranged on the outer side of the bottom barrel wall (1) of the heating chamber and is communicated with the heating steam bin b through a steam transmission pipe (10).