Vertical evaporation system and vertical heat pump vacuum evaporator

Abstract

The utility model discloses a vertical evaporation system and a vertical heat pump vacuum evaporator. The system comprises a stock solution evaporator, an evaporation heat exchanger and a condensation heat exchanger, wherein the evaporation heat exchanger is arranged on the outer side of the lower part of the stock solution evaporator; a discharge port is formed in the bottom of the stock solution evaporator, and the rotating shaft is driven by the driving motor to rotate and drive the spiral blade at the discharge port to rotate; a flat heat exchange surface is arranged at the lower part of the stock solution evaporator and is used for exchanging heat with the evaporation heat exchanger; a scraping plate capable of scraping the heat exchange surface is tightly attached to the heat exchange surface; the condensation heat exchanger is arranged in the stock solution evaporator and located on the upper portion of the stock solution evaporator. By adopting the scheme, not only can the heat exchange surface of the stock solution evaporator be scraped and cleaned through the scraping plate, but also the problems of accumulation and discharge of concentrates are synchronously solved through the spiral blade at the discharge outlet at the bottom, and dirt deposition or salt hardening caused by accumulation of the concentrates at the bottom of the stock solution evaporator is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of evaporation equipment, and in particular to a vertical evaporation system and a vertical heat pump vacuum evaporator. Background Art

[0002] Evaporator is a common chemical equipment, which is widely used in chemical industry, environmental protection, pharmaceutical, food, textile and energy. Evaporator usually utilizes the different boiling points of water and other solutes in the solution to be treated, and boils and vaporizes water by heating, so that water escapes from the solution, thereby achieving the purpose of separating water from other solutes and concentrating the solution. In recent years, evaporator has also been used to treat wastewater, especially highly polluted and high-concentration industrial wastewater, such as electroplating wastewater, cleaning wastewater, emulsified wastewater, etc. It has the advantages of wide adaptability, short process chain and high degree of automation.

[0003] However, some disadvantages of existing evaporators limit their wastewater treatment effect and wider use. For example, for vertical evaporators, as evaporation and concentration proceed, the concentrate easily accumulates at the bottom of the evaporator, causing dirt accumulation or salt caking. This is a problem that those skilled in the art need to solve urgently. Utility Model Content

[0004] The present application aims to provide a vertical evaporation system, which can not only scrape and clean the heat exchange surface of the raw liquid evaporator, but also simultaneously solve the problem of concentrate accumulation and discharge through the spiral blades at the bottom discharge port, thereby avoiding dirt accumulation or salt hardening caused by the accumulation of concentrate at the bottom.

[0005] In the first aspect, the present application provides a vertical evaporation system, including a raw liquid evaporator, an evaporation heat exchanger and a condensation heat exchanger, wherein the evaporation heat exchanger is arranged on the outer side of the lower part of the raw liquid evaporator; a discharge port is opened at the bottom of the raw liquid evaporator, and a spiral blade is arranged at the discharge port, and the spiral blade is connected to a rotating shaft, and the rotating shaft is connected to a driving motor, and rotates under the drive of the driving motor, and drives the spiral blade to rotate; the lower part of the raw liquid evaporator has a flat heat exchange surface for heat exchange with the evaporation heat exchanger; a scraper capable of scraping the heat exchange surface is closely arranged on the heat exchange surface; the condensation heat exchanger is arranged in the raw liquid evaporator and is located on the upper part of the raw liquid evaporator.

[0006] In a possible implementation manner of the first aspect, the scraper is connected to the rotating shaft, and the rotating shaft rotates to drive the scraper to rotate and scrape the heat exchange surface.

[0007] In a possible implementation manner of the first aspect, a rotatable fan blade is further provided on an upper portion of the raw liquid evaporator.

[0008] In a possible implementation manner of the first aspect, the fan blades are connected to the rotating shaft, and the rotating shaft rotates to drive the fan blades to rotate.

[0009] In a possible implementation manner of the first aspect, a speed reducer is further provided between the fan blade and the spiral blade, so that a rotation speed of the spiral blade is lower than a rotation speed of the fan blade.

[0010] In a possible implementation manner of the first aspect, the evaporative heat exchanger is disposed on the outer side of the bottom of the raw liquid evaporator and / or the outer side of the lower tank wall.

[0011] In a possible implementation manner of the first aspect, a condensate tank body is provided along the tank wall at the upper portion of the raw liquid evaporator, and the condensation heat exchanger is a coil heat exchanger distributed in a circular manner in the condensate tank body.

[0012] In a second aspect, the present application provides a vertical heat pump vacuum evaporator, comprising any vertical evaporation system of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] Figure 1 This is a structural schematic diagram of an implementation method of the vertical evaporation system of the present application;

[0015] Figure 2 This is a schematic structural diagram of another implementation of the vertical evaporation system of the present application.

[0016] Description of reference numerals:

[0017] 100-raw liquid evaporator; 1001-discharge port; 1002-heat exchange surface; 1003-tank wall; 101-evaporation heat exchanger; 102-condensation heat exchanger; 103-condensate tank body; 1031-tank body folding plate; 110-drive motor; 111-scraper; 112-bracket; 113-rotating shaft; 120-liquid level sensor; 131-fan blades; 132-spiral blades; 133-reducer. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present application, the present application is described below in conjunction with the accompanying drawings and specific implementation methods.

[0019] See also Figure 1 to Figure 2An embodiment of the present application provides a vertical evaporation system, including a raw liquid evaporator 100 , an evaporation heat exchanger 101 and a condensation heat exchanger 102 .

[0020] The stock liquid evaporator 100 is the main body for boiling and evaporating the wastewater stock liquid. The stock liquid evaporator can be a cylinder, a combination of a cylinder and a cone, etc. The present application does not limit the specific shape of the stock liquid evaporator.

[0021] The evaporative heat exchanger 101 is arranged on the outer side of the lower part of the raw liquid evaporator 100, which can be the outer side of the side wall (i.e., the lower tank wall) of the lower half of the raw liquid evaporator 100, or the outer side of the bottom, or the outer side of the side wall and the bottom. The side wall or the bottom of the raw liquid evaporator 100 is at least partially a flat area, which can form a heat exchange surface 1002 for heat exchange with the evaporative heat exchanger 101.

[0022] In some implementations, the heat exchange surface 1002 may be designed to be a flat disc-shaped or conical surface, for example Figure 1 In other implementations, the heat exchange surface 1002 may be designed as a flat curved surface or an annular surface, for example Figure 2 Optionally, the heat exchange surface is a smooth and flat surface, which is relatively easier to clean and less prone to scaling.

[0023] In some implementations, the evaporative heat exchanger can adopt a jacket structure, in which a high-temperature refrigerant can be input into the jacket, and the outside of the jacket, that is, the heat exchange surface facing the inside of the raw liquid evaporator, is wastewater. During the operation of the vertical evaporation system, the high-temperature refrigerant transfers heat to the wastewater through the heat exchange surface, causing it to be heated, evaporated, and concentrated.

[0024] The bottom of the stock liquid evaporator 100 may be provided with a discharge port 1001, and after the evaporation and concentration are completed, the concentrate can be discharged from the discharge port 1001. The discharge port 1001 is provided with a spiral blade 132, and the spiral blade 132 is connected to the rotating shaft 113, and the rotating shaft 113 is connected to the driving motor 110, and rotates under the drive of the driving motor 110, and drives the spiral blade 132 to rotate.

[0025] During the evaporation process, the rotating shaft rotates in one direction (for example, forward), and the spiral blades transport the liquid or solids they come into contact with upward, which can prevent the concentrate from accumulating at the bottom of the stock liquid evaporator and causing dirt accumulation or salt hardening. After the concentration is completed, the concentrate needs to be discharged. If the concentrate has a high concentration and a high solid content, it often has a high viscosity or contains a large number of crystals with poor fluidity and is difficult to discharge. When discharging, the rotating shaft rotates in another direction (for example, reverse), and the spiral blades push the liquid or solids they come into contact with downward, which can better discharge the concentrate or crystals, solving the problem of high-concentration concentrates being difficult to discharge.

[0026] A scraper 111 capable of scraping the heat exchange surface 1002 is closely disposed on the heat exchange surface 1002. The scraper is closely attached to the heat exchange surface and can scrape the heat exchange surface by relative displacement with the heat exchange surface, thereby achieving a cleaning effect. It is understandable that one or more scrapers can be disposed on the heat exchange surface, and this application does not limit this.

[0027] In some implementations, the scraper 111 is connected to the rotating shaft 113. Driven by the rotating shaft, the scraper rotates on the heat exchange surface to scrape the heat exchange surface. Optionally, the scraper 111 can be connected to the rotating shaft 113 through a bracket 112. Of course, the scraper can also be connected to the rotating shaft in other possible ways, which is not limited in this application.

[0028] The condensing heat exchanger 102 is disposed in the raw liquid evaporator 100 and is located at the upper part of the raw liquid evaporator 100. A cooling medium circulates in the condensing heat exchanger 102. The steam generated by the evaporation of the wastewater rises to the upper part of the raw liquid evaporator, meets the condensing heat exchanger for heat exchange, and transfers the heat to the cooling medium therein, thereby condensing into condensed water, which is collected and output to the outside of the raw liquid evaporator.

[0029] Optionally, a rotatable fan blade 131 is further provided on the upper part of the stock liquid evaporator 100. Wastewater, especially industrial wastewater with complex components, usually contains oils, solvents or other volatile residues. During the evaporation process in the stock liquid evaporator, volatile solvents and pollutants will also be vaporized. Due to the intense boiling, foam and small droplets containing oils and pollutants will be mixed in the water vapor. The rotation of the fan blades can shear and block the foam during the evaporation process, which has a good defoaming effect and prevents it from affecting the quality of the condensed water.

[0030] Optionally, the fan blade 131 is installed above the rotating shaft 113 , and the fan blade 131 is connected to the rotating shaft 113 , and is driven to rotate by the driving motor 110 and the rotating shaft 113 .

[0031] Optionally, a reducer 133 is further provided between the fan blade 131 and the spiral blade 132 so that the rotation speed of the spiral blade 132 is lower than the rotation speed of the fan blade 131. The fan blade has a higher rotation speed and can have a better defoaming effect, while the spiral blade has a lower rotation speed. When the two are driven by the same drive motor and rotating shaft, a reducer can be provided between the two to meet the difference in speed. In this way, without affecting the normal operation of the fan blade and the spiral blade, since the fan blade, the spiral blade, and even the scraper share the drive motor and the rotating shaft, the structure of the entire vertical evaporation system can be made simpler.

[0032] In some implementations, a condensate tank 103 is provided on the tank wall 1003 at the upper portion of the raw liquid evaporator 100, and the condensation heat exchanger 102 can be provided in the condensate tank 103. The condensed water condensed from the steam can be collected by the condensate tank and output to the outside of the raw liquid evaporator. Figure 2 , the condensate tank body 103 can be arranged around the tank wall 1003, and the condensation heat exchanger 102 can adopt a coil heat exchanger, and its coils are distributed in the condensate tank body 103 in a circular manner. The condensation heat exchanger is arranged close to the tank wall, rather than in the middle of the upper part of the raw liquid heat exchanger. On the one hand, it can provide space for the boiling of wastewater. The wastewater boiling space is large, which can reduce the generation of foam. On the other hand, the steam rising flow channel is wide, which slows down the steam flow rate and reduces the amount of debris and droplets mixed in the steam. Both aspects can effectively reduce the impurities in the condensed water and improve the quality of the condensed water. In addition, when the temperature of the cooling medium in the condensation heat exchanger is too low, it is easy for some organic matter or volatile substances mixed in the steam to condense and mix with the condensed water, thereby affecting the quality of the condensed water. When the above method is adopted, when the temperature of the cooling medium is too low, it can absorb heat from the environment outside the raw liquid evaporator relatively quickly, reducing the influence of the low temperature of the cooling medium on the quality of the condensed water. From another perspective, it is also helpful to improve the quality of the condensed water. Of course, this also provides space for setting the rotation axis.

[0033] In some implementations, a tank body folded plate 1031 may be provided on the tank wall 1003, and the tank body folded plate 1031 and the tank wall 1003 together form the condensate tank body 103. The tank body folded plate 1031 may be as close to the tank wall 1003 as possible to form a relatively narrow tank body, thereby occupying as little space as possible on the upper part of the raw liquid evaporator 100. This design of narrow tank body and wide flow channel can provide a relatively larger boiling space and gas flow channel, and when the temperature of the cooling medium is too low, the cooling medium can absorb heat from the external environment more directly through the tank wall, which helps to further improve the quality of condensed water.

[0034] The cooling medium of the condensing heat exchanger can be refrigerant or cold water. Compared with the use of common refrigerants, the use of cold water, on the one hand, has a milder condensation temperature and a more even distribution, which helps to improve the quality of condensed water. On the other hand, it can at least make the cooling system more compact, more reliable, and lower the manufacturing cost, providing a basis for the miniaturization of vertical heat pump vacuum evaporators. In addition, since no special pipeline is required, it provides a basis for the joint of the inlet and outlet of the condensing heat exchanger, which enables the condensing heat exchanger to be directly disassembled and cleaned when it is dirty, which is also convenient for maintenance.

[0035] See also Figure 1 and Figure 2, the evaporation heat exchanger 101 can be arranged on the outside of the side wall or bottom surface of the raw liquid evaporator 100. In contrast, if it is arranged on the side wall, or on the side wall and the bottom surface, as the evaporation proceeds, the wastewater level may drop, which may cause the effective heat exchange area to decrease, thereby causing uneven heating, causing dry burning scaling, evaporator deformation and damage, reduced heat exchange efficiency, unstable evaporation process affecting the quality of condensed water outlet, and other problems. The heat exchange surface is at the bottom of the raw liquid evaporator. During the evaporation and concentration process, even if the amount of waste liquid decreases, the heat exchange surface can always be completely covered by the waste liquid. The heat exchange surface is flat, open and cleaned with a scraper, which can effectively solve these problems.

[0036] In some implementations, a liquid level sensor may also be provided in the raw liquid evaporator 100 to control the height of the liquid in the raw liquid evaporator 100 so that it does not exceed the position of the liquid level sensor. For example, the height of the liquid level sensor may be flush with the highest point of the heat exchange surface or slightly higher than the highest point of the heat exchange surface, so that the effective heat exchange area can remain substantially unchanged.

[0037] The embodiment of the present application also provides a vertical heat pump vacuum evaporator, which may include any possible vertical evaporation system described above.

[0038] In some implementations, the vertical heat pump vacuum evaporator may further include a heat pump loop for providing heat to the evaporation heat exchanger and recycling the heat.

[0039] In some implementations, the vertical heat pump vacuum evaporator may further include a vacuum system for providing a vacuum environment for the raw liquid evaporator.

[0040] In some implementations, the vertical heat pump vacuum evaporator may further include a cooling system for providing cooling medium for the condensing heat exchanger, the first heat exchanger, and other possible equipment that needs cooling (eg, some equipment in the vacuum system).

[0041] In some implementations, the cooling medium of the cooling system can be cold water. The vertical heat pump vacuum evaporator includes a cold water heat exchanger, an ejector, and a circulating pump. The first cold water outlet of the cold water heat exchanger is connected to the liquid inlet of the ejector, the liquid outlet of the ejector is connected to the inlet of the condensing heat exchanger 102, and the air intake of the ejector is connected to the raw liquid evaporator 100; the outlet of the condensing heat exchanger 102 is connected to the inlet of the circulating pump, and the outlet of the circulating pump is connected to the first cold water inlet of the cold water heat exchanger. In this way, a cooling and vacuum loop is formed, so that the cooling system and the vacuum system can be combined and simplified, and further streamlined. This makes the vertical heat pump vacuum evaporator more compact and compact as a whole, with lower space requirements, and can be arranged near the waste production point to treat wastewater nearby.

[0042] It should be understood that in the description of the present application, the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are generally based on the directions or positional relationships shown in the drawings. These directions and positional relationships are for the convenience of description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present application.

[0043] It should also be understood that in the description of this application, unless otherwise specifically defined, the terms "install", "connect", "assemble", "fix" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected or integrally connected; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, they can understand the specific meanings of the above terms in this application according to specific circumstances.

[0044] It should also be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. Unless otherwise clearly and specifically defined, "plurality" means two or more.

[0045] The same and similar parts between the various embodiments in this specification can be referred to each other. Different implementation methods in the above embodiments can be combined with each other as long as they are not contradictory. The above implementation methods do not constitute a limitation on the protection scope of this application.

Claims

1. A vertical evaporation system, comprising a raw liquid evaporator, an evaporation heat exchanger and a condensation heat exchanger, characterized in that: The evaporative heat exchanger is arranged on the outer side of the lower part of the raw liquid evaporator; The bottom of the stock liquid evaporator is provided with a discharge port, the discharge port is provided with a spiral blade, the spiral blade is connected to a rotating shaft, the rotating shaft is connected to a driving motor, and rotates under the drive of the driving motor, and drives the spiral blade to rotate; the lower part of the stock liquid evaporator has a flat heat exchange surface for heat exchange with the evaporation heat exchanger; a scraper capable of scraping the heat exchange surface is closely arranged on the heat exchange surface; The condensing heat exchanger is arranged in the raw liquid evaporator and is located at the upper part of the raw liquid evaporator.

2. The vertical evaporation system according to claim 1, characterized in that: The scraper is connected to the rotating shaft, and the rotating shaft rotates to drive the scraper to rotate and scrape the heat exchange surface.

3. The vertical evaporation system according to any one of claims 1 to 2, characterized in that: The upper part of the raw liquid evaporator is also provided with rotatable fan blades.

4. The vertical evaporation system according to claim 3, characterized in that: The fan blades are connected to the rotating shaft, and the rotating shaft rotates to drive the fan blades to rotate.

5. The vertical evaporation system according to claim 4, characterized in that: A speed reducer is also provided between the fan blade and the spiral blade so that the rotation speed of the spiral blade is lower than the rotation speed of the fan blade.

6. The vertical evaporation system according to claim 3, characterized in that: The evaporation heat exchanger is arranged on the outer side of the bottom of the raw liquid evaporator and / or the outer side of the lower tank wall.

7. The vertical evaporation system according to claim 3, characterized in that: A condensate tank body is arranged along the tank wall at the upper part of the raw liquid evaporator, and the condensation heat exchanger is a coil heat exchanger, which is circumferentially distributed in the condensate tank body.

8. A vertical heat pump vacuum evaporator, characterized in that: A vertical evaporation system comprising any one of claims 1 to 7.

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