CN222173125U - Vertical evaporation system and vertical heat pump vacuum evaporator - Google Patents

Abstract

The application 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 portion of the stock solution evaporator, a discharge port is formed in the bottom of the stock solution evaporator, a rotating shaft is driven by a driving motor to rotate and drive a spiral blade at the discharge port to rotate, the lower portion of the stock solution evaporator is provided with a flat heat exchange surface for heat exchange with the evaporation heat exchanger, a scraping plate capable of scraping the heat exchange surface is arranged on the heat exchange surface in a clinging mode, and the condensation heat exchanger is arranged in the stock solution evaporator and is located on the upper portion of the stock solution evaporator. By adopting the scheme, the heat exchange surface of the stock solution evaporator can be scraped and cleaned by the scraping plate, and the problems of concentrate accumulation and discharge are synchronously solved by the spiral blade of the bottom discharge port, so that the pollution accumulation or salt hardening caused by the accumulation of the concentrate at the bottom of the stock solution evaporator is avoided.

Description

Vertical evaporating system and vertical heat pump vacuum evaporator

Technical Field

The application relates to the technical field of evaporation equipment, in particular to a vertical evaporation system and a vertical heat pump vacuum evaporator.

Background

The evaporator is a common chemical equipment and is widely used in the fields of chemical industry, environmental protection, pharmacy, food, textile, energy and the like. The evaporator generally utilizes the difference of boiling points of water and other solutes in a solution to be treated, and the water is boiled and gasified by heating and escapes from the solution, so that the purposes of separating the water from the other solutes, concentrating the solution and the like are realized. In recent years, evaporators have also been used for treating wastewater, particularly high-pollution, high-concentration industrial wastewater such as electroplating wastewater, cleaning wastewater, emulsified wastewater, and the like. It has the advantages of wide adaptability, short process chain, high automation degree, etc.

However, some of the disadvantages of the existing evaporators limit their effectiveness in treating wastewater and their wider use. For example, in the case of a vertical evaporator, as evaporative concentration proceeds, the concentrate tends to accumulate at the bottom of the evaporator, causing fouling or salt hardening. This is a problem to be solved by the person skilled in the art.

Disclosure of utility model

The application aims to provide a vertical evaporation system which not only can scrape and clean the heat exchange surface of a stock solution evaporator, but also solves the problem of concentrate accumulation and discharge synchronously through the spiral blade of a bottom discharge port, and avoids dirt accumulation or salt hardening caused by the accumulation of the concentrate at the bottom.

The application provides a vertical evaporation system, which 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 portion of the stock solution evaporator, a discharge port is formed in the bottom of the stock solution evaporator, a spiral blade is arranged at the discharge port and connected with a rotating shaft, the rotating shaft is connected with a driving motor and is driven to rotate by the driving motor and drives the spiral blade to rotate, the lower portion of the stock solution evaporator is provided with a flat heat exchange surface for heat exchange with the evaporation heat exchanger, a scraping plate capable of scraping the heat exchange surface is tightly arranged on the heat exchange surface, and the condensation heat exchanger is arranged in the stock solution evaporator and is positioned on the upper portion of the stock solution evaporator.

In a possible implementation manner of the first aspect, the scraping plate is connected with the rotating shaft, and the rotating shaft rotates to drive the scraping plate to scrape the heat exchange surface in a rotating manner.

In a possible implementation manner of the first aspect, the upper part of the stock solution evaporator is further provided with rotatable fan blades.

In a possible implementation manner of the first aspect, the fan blade is connected to the rotation shaft, and the rotation shaft rotates to drive the fan blade to rotate.

In a possible implementation manner of the first aspect, a speed reducer is further disposed between the fan blade and the spiral blade, so that a rotation speed of the spiral blade is smaller than a rotation speed of the fan blade.

In a possible implementation manner of the first aspect, the evaporation heat exchanger is arranged outside the bottom of the raw liquid evaporator and/or outside the lower tank wall.

In a possible implementation manner of the first aspect, a condensate tank body is arranged along a tank wall at an upper part of the stock solution evaporator, and the condensate heat exchanger is a coil heat exchanger and is circumferentially distributed in the condensate tank body.

In a second aspect, the present application provides a vertical heat pump vacuum evaporator comprising any of the vertical evaporation systems of the first aspect.

Drawings

In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic diagram of one implementation of a vertical evaporation system of the present application;

Fig. 2 is a schematic structural view of another implementation of the vertical evaporation system of the present application.

Reference numerals illustrate:

100-stock solution evaporator, 1001-discharge port, 1002-heat exchange surface, 1003-tank wall, 101-evaporation heat exchanger, 102-condensation heat exchanger, 103-condensation liquid tank, 1031-tank folded plate, 110-driving motor, 111-scraper, 112-bracket, 113-rotating shaft, 120-liquid level sensor, 131-fan blade, 132-spiral blade and 133-speed reducer.

Detailed Description

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 with reference to the accompanying drawings and detailed description.

Referring to fig. 1 to 2, an 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.

The stock solution evaporator 100 is a main body for boiling evaporation of a wastewater stock solution. The stock solution evaporator can be in a structure of a cylinder, a combination of the cylinder and a cone, and the like, and the specific shape of the stock solution evaporator is not limited.

The evaporation heat exchanger 101 is provided outside the lower portion of the raw liquid evaporator 100, and may be outside the side wall (i.e., lower tank wall) of the lower half portion of the raw liquid evaporator 100, outside the bottom portion, or outside the side wall and the bottom portion. The side wall or bottom of the stock solution evaporator 100 is at least partially flat, and a heat exchange surface 1002 for exchanging heat with the evaporation heat exchanger 101 can be formed.

In some implementations, the heat exchange surface 1002 may be designed as a flat dish-shaped or cone-shaped surface, such as that shown in fig. 1. In other implementations, the heat exchanging surface 1002 may be designed as a flat curved surface or annulus, such as that shown in FIG. 2. Alternatively, the heat exchange surface is a smooth and flat surface, which is relatively easier to clean and is not easy to scale.

In some implementations, the evaporation heat exchanger may be in a jacket structure, high-temperature refrigerant may be input into the jacket, and the waste water is the heat exchange surface outside the jacket, that is, facing the inside of the stock solution evaporator. In the working process of the vertical evaporation system, the high-temperature refrigerant transfers heat to the wastewater through the heat exchange surface, so that the wastewater is heated, evaporated and concentrated.

A drain 1001 may be provided at the bottom of the stock solution evaporator 100, and concentrate may be drained from the drain 1001 after evaporation and concentration is completed. The discharge port 1001 is provided with a spiral vane 132, the spiral vane 132 is connected with a rotation shaft 113, the rotation shaft 113 is connected with a driving motor 110, and the rotation shaft is driven by the driving motor 110 to rotate and drive the spiral vane 132 to rotate.

During evaporation, the rotating shaft rotates in one direction (e.g. forward rotation), and the spiral blades convey the contacted liquid or solid upwards, so that the concentrate can be prevented from accumulating at the bottom of the stock solution evaporator, and dirt accumulation or salt hardening can be prevented. After the concentration is completed, the concentrate needs to be discharged. If the concentration of the concentrate is large, the solid content is high, the viscosity tends to be large, or a large amount of crystals are contained, the fluidity is poor, and the discharge is difficult. When discharging, the rotation shaft rotates along the other direction (such as reverse rotation), the spiral blade pushes the contacted liquid or solid downwards, so that the concentrate or the crystal can be discharged better, and the problem that the high-concentration concentrate is difficult to discharge is solved.

The scraper 111 capable of scraping the heat exchange surface 1002 is closely attached to the heat exchange surface 1002. The scraping plate is tightly attached to the heat exchange surface, and can scrape the heat exchange surface through relative displacement with the heat exchange surface, so that the cleaning effect is achieved. It will be appreciated that one or more scrapers may be provided on the heat exchanging surface, as the application is not limited in this regard.

In some implementations, the scraping plate 111 is connected with the rotating shaft 113, and is driven by the rotating shaft to rotate on the heat exchange surface to scrape the heat exchange surface. Alternatively, the blade 111 may be connected to the rotation shaft 113 through a bracket 112. Of course, the scraper can also be connected to the rotation shaft in other possible ways, which the application is not limited to.

The condensing heat exchanger 102 is disposed in the raw liquid evaporator 100 and is located at an upper portion 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 stock solution evaporator, meets a condensation heat exchanger for heat exchange, and transfers heat to a cooling medium in the water, so that the water is condensed into condensed water, and the condensed water is collected and output to the outside of the stock solution evaporator.

Optionally, the upper part of the stock solution evaporator 100 is further provided with rotatable fan blades 131. Waste water, especially industrial waste water of complex composition, often contains oils, solvents or other volatile residues. During evaporation in the bulk evaporator, volatile solvents and contaminants are vaporized, and due to the intense boiling, water vapor is entrained with bubbles and droplets containing oils and contaminants. The fan blades rotate, so that foams can be sheared and shielded in the evaporation process, a good defoaming effect is achieved, and the influence on the quality of condensed water is avoided.

Alternatively, the fan blade 131 is mounted above the rotation shaft 113, and the fan blade 131 is connected to the rotation shaft 113, and is rotated by the driving motor 110 and the rotation shaft 113.

Optionally, a speed reducer 133 is further disposed between the fan blade 131 and the spiral blade 132, so that the rotation speed of the spiral blade 132 is smaller than the rotation speed of the fan blade 131. The fan blade rotating speed is higher, the good defoaming effect can be achieved, the rotating speed of the spiral blade is lower, and when the fan blade rotating speed and the spiral blade rotating speed are driven by the same driving motor and the rotating shaft, a speed reducer can be arranged between the fan blade rotating speed and the spiral blade rotating speed, so that the difference of the speeds of the fan blade rotating speed and the spiral blade rotating speed can be met. By adopting the mode, under the condition that the normal work of the fan blades and the spiral blades is not influenced, the fan blades, the spiral blades and even the scraping plates share the driving motor and the rotating shaft, so that the structure in the whole vertical evaporation system is simpler.

In some implementations, a condensate sump 103 is provided along the tank wall 1003 of the upper portion of the bulk liquid evaporator 100, and a condensate heat exchanger 102 may be provided in the condensate sump 103. The condensed water condensed by the steam can be collected by the condensed liquid tank body and output to the outside of the stock solution evaporator. Illustratively, referring to FIG. 2, the condensate tank body 103 may be disposed around the tank wall 1003, and the condensate heat exchanger 102 may be a coil heat exchanger with coils circumferentially distributed in the condensate tank body 103. The condensing heat exchanger is close to the tank wall and arranged in the middle of the upper part of the stock solution heat exchanger, space can be provided for boiling wastewater on one hand, the space for boiling wastewater is larger, foam generation can be reduced, on the other hand, the rising flow channel of steam is wider, the flow rate of steam is slowed down, the amount of mixed broken foam and liquid drops in the steam is reduced, impurities in condensed water can be effectively reduced on both sides, and the quality of the condensed water is improved. In addition, when the temperature of the cooling medium in the condensing heat exchanger is too low, some organic matters or volatile matters mixed in the steam are easily condensed and mixed with the condensed water, so that the quality of the condensed water is affected. By adopting the mode, when the temperature of the cooling medium is too low, the cooling medium can absorb heat from the environment outside the stock solution evaporator relatively quickly, so that the influence of the too low temperature of the cooling medium on the quality of the condensed water is reduced, and the quality of the condensed water is improved in terms of the change. This, of course, also provides a setting space for the rotation shaft.

In some implementations, a tank wall 1003 may be provided with a tank flap 1031, the tank flap 1031 together with the tank wall 1003 forming the condensate tank 103. The channel flap 1031 may be formed as close to the tank wall 1003 as possible to form a relatively narrow, narrow channel, thereby taking up as little space as possible in the upper portion of the stock solution evaporator 100. The design of the narrow groove body and the wide flow passage can provide a relatively larger boiling space and a gas flow passage, 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, thereby being beneficial to further improving the quality of condensed water.

The cooling medium of the condensing heat exchanger can be refrigerant or cold water. Compared with the common refrigerant, the cold water mode is adopted, so that on one hand, the condensing temperature is milder, the distribution is more uniform, the quality of condensed water is improved, on the other hand, at least the cooling system can be enabled to be more compact, the reliability is higher, the manufacturing cost is lower, and a realization foundation is provided for the miniaturization of the vertical heat pump vacuum evaporator. In addition, because special pipelines are not needed, a realization basis is provided for loose joint of an inlet and an outlet of the condensing heat exchanger, and then the condensing heat exchanger can be directly disassembled for cleaning when being polluted, and is also convenient for maintenance.

Referring to fig. 1 and 2, the evaporation heat exchanger 101 may be disposed outside a sidewall or a bottom surface of the stock solution evaporator 100. In contrast, the waste water liquid level is reduced along with evaporation, so that the effective heat exchange area is reduced, uneven heating is caused, dry burning scaling, deformation and damage of an evaporator, reduction of heat exchange efficiency, unstable evaporation process, influence on condensate water outlet quality and the like are caused. The heat exchange surface is positioned at the bottom of the stock solution evaporator, even if the waste liquid amount is reduced in the evaporation and concentration process, the heat exchange surface can be completely covered by the waste liquid all the time, and the heat exchange surface is flat and open and matched with scraping plates for cleaning, so that the problems can be effectively solved.

In some implementations, a level sensor may also be provided in the bulk liquid evaporator 100 for controlling the level of liquid in the bulk liquid evaporator 100 so that it does not exceed the location of the level sensor. For example, the level sensor may be positioned at a height level with or slightly above the highest point of the heat exchanging surface, so that the effective heat exchanging area can be kept substantially unchanged.

The embodiment of the application also provides a vertical heat pump vacuum evaporator which can comprise any one of the possible vertical evaporation systems.

In some implementations, a heat pump circuit for providing heat to the evaporative heat exchanger and recycling the heat may also be included in the vertical heat pump vacuum evaporator.

In some implementations, a vacuum system may also be included in the vertical heat pump vacuum evaporator for providing a vacuum environment for the liquid concentrate evaporator.

In some implementations, a cooling system may also be included in the vertical heat pump vacuum evaporator for providing a cooling medium for the condensing heat exchanger, the first heat exchanger, and other devices that may be present that require cooling (e.g., some devices in a vacuum system).

In some implementations, the cooling medium of the cooling system may employ chilled water. The vertical heat pump vacuum evaporator comprises a cold water heat exchanger, an ejector and a circulating pump. The first cold water outlet of the cold water heat exchanger is connected with the liquid inlet of the ejector, the liquid outlet of the ejector is connected with the inlet of the condensation heat exchanger 102, the air suction port of the ejector is connected with the stock solution evaporator 100, the outlet of the condensation heat exchanger 102 is connected with the inlet of the circulating pump, and the outlet of the circulating pump is connected with the first cold water inlet of the cold water heat exchanger. Thus, a cooling and vacuum loop is formed, so that the cooling system and the vacuum system can be combined and simplified, and further simplified. The vertical heat pump vacuum evaporator is compact and small, has lower space requirement, and can be arranged nearby at a waste production point to treat waste water nearby.

It should be understood that in the description of the present application, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientation or positional relationship generally based on that shown in the drawings. These directions and positional relationships are for convenience of description, and are not indicative or implied that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the application.

It should also be understood that in the description of the present application, unless specifically limited otherwise, the terms "mounted," "connected," "assembled," "secured," and the like are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, as they may be mechanically or electrically connected, and as they may be directly or indirectly connected through intermediaries. It will be understood by those of ordinary skill in the art that the specific meaning of the terms described above in this disclosure may be understood as appropriate.

It should also be appreciated that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. Unless specifically limited otherwise, the meaning of "a plurality" is two or more.

The same or similar parts between the various embodiments in this specification are referred to each other. The different implementations of the above embodiments may be combined with each other as long as they are not contradictory. The above embodiments do not limit the scope of the present application.

Claims (8)

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 , wherein 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 a rotatable fan blade is also provided on the upper part of the raw liquid evaporator. 4 . The vertical evaporation system according to claim 3 , wherein 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 further 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 is characterized in that a condensate tank is provided along the tank wall at the upper part of the raw liquid evaporator, and the condensation heat exchanger is a coil heat exchanger distributed in a circular manner in the condensate tank. 8. A vertical heat pump vacuum evaporator, characterized by comprising the vertical evaporation system according to any one of claims 1 to 7.