CN119733255A - Intelligent liquid distribution device for falling film evaporator and use method thereof - Google Patents
Intelligent liquid distribution device for falling film evaporator and use method thereof Download PDFInfo
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- CN119733255A CN119733255A CN202510027779.4A CN202510027779A CN119733255A CN 119733255 A CN119733255 A CN 119733255A CN 202510027779 A CN202510027779 A CN 202510027779A CN 119733255 A CN119733255 A CN 119733255A
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Abstract
本发明公开了一种用于降膜蒸发器的智能布液设备及其使用方法，包括壳体以及在壳体内从上向下依次布置的进料管、初级布液单元、增压单元、智能布液分配单元、列管和出料管；所述进料管连接初级布液单元，初级布液单元连接增压单元，增压单元连接智能布液分配单元，智能布液分配单元将液体分配到列管，列管连接出料管。利用本发明，使得无论布液器来液是否稳定均可均匀布膜，其次可以智能调节布液流量大小，且能有效利用蒸汽预热同时避免蒸汽影响导致布膜不均匀。
The present invention discloses an intelligent liquid distribution device for a falling film evaporator and a method for using the device, comprising a housing and a feed pipe, a primary liquid distribution unit, a booster unit, an intelligent liquid distribution unit, a tube array and a discharge pipe arranged in sequence from top to bottom in the housing; the feed pipe is connected to the primary liquid distribution unit, the primary liquid distribution unit is connected to the booster unit, the booster unit is connected to the intelligent liquid distribution unit, the intelligent liquid distribution unit distributes liquid to the tube array, and the tube array is connected to the discharge pipe. By using the present invention, the film can be evenly distributed regardless of whether the liquid from the liquid distributor is stable, and the liquid distribution flow rate can be intelligently adjusted, and the steam preheating can be effectively utilized while avoiding the uneven film distribution caused by the influence of steam.
Description
Technical Field
The invention relates to the field of falling film evaporators, in particular to intelligent liquid distribution equipment for a falling film evaporator and a use method thereof.
Background
Among thin film evaporators, falling film evaporators are known for their excellent evaporation efficiency, and they constitute three main categories of thin film evaporators together with two other thin film evaporators (a rising film evaporator and a wiped film evaporator). In particular, a vertical falling film evaporator is one of the falling film evaporators, and is widely used in various industrial fields including chemical industry, light industry, synthetic fiber, food processing, pharmaceutical industry, sea water desalination, wastewater treatment, metal smelting, etc., with its excellent performance characteristics such as high heat transfer efficiency, rapid heating of materials, mild treatment of sensitive materials to prevent decomposition, low pressure loss, heat loss due to small temperature difference, remarkable energy saving effect, strong anti-fouling ability, low internal liquid retention, etc.
The Chinese patent document with the publication number of CN114191830A discloses a vertical tube external falling film evaporator, which comprises an outer shell, wherein a material inlet channel is penetrated through the top of the outer shell, a material outlet channel is arranged at the bottom of the outer shell, a distribution plate and a falling film evaporation unit are sequentially arranged in the outer shell along the downward direction of the material inlet channel, and the falling film evaporation unit comprises a first tube plate, a second tube plate and at least 1 single-head heat exchange tube.
Chinese patent publication No. CN105890238a discloses a vertical falling film evaporator with a novel liquid separating device, which includes an evaporator upper end, an evaporator main body portion and an evaporator lower end. The evaporator comprises an evaporator body, a main body part and a sediment discharging device, wherein the evaporator body part comprises a layered parallel arrangement refrigerant liquid inlet flute pipe, a novel liquid distribution disk and the like, a proper refrigerant distributor is arranged in the main body, the refrigerant can be uniformly distributed on the surface of a tube bundle and fully contacted with the surface of the tube bundle, a refrigerant sediment liquid return device is arranged at the bottom of the main body, and the lower end of the evaporator is used for the water path and sediment discharge.
The main function of the vertical falling film evaporator is to form a thin film on the pipe wall of the liquid and heat and evaporate the liquid, and the working efficiency and the operation characteristics of the vertical falling film evaporator are greatly dependent on the uniform distribution of the liquid. This means that the liquid needs to be uniformly dispersed into each heat exchange tube and a stable and uniform film formed on the tube wall. The rationality of the design of the liquid distribution device is critical to the uniform distribution of the liquid, uneven distribution can lead to drying in certain areas, and certain areas can lead to too thick films and influence the heat exchange efficiency due to too high flow rate, and too low flow rate can lead to drying. Therefore, the design of the distributor has a direct influence on the thermal efficiency and the operation stability of the evaporator, which in turn affects the production efficiency, the product quality and the service life of the equipment.
The ideal liquid distributor should have the characteristics of insensitivity to liquid layer height variation, uniform distribution of liquid, stable film formation, greater operational flexibility, low pressure loss, and less tendency to clogging. However, once the design and manufacture of the conventional falling film evaporator are completed, the film forming flow rate of the conventional falling film evaporator is usually fixed, and the conventional falling film evaporator needs to be stopped and disassembled to be adjusted, so that the conventional falling film evaporator cannot be adjusted on line, and therefore the ideal characteristics cannot be met.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides intelligent liquid distribution equipment for a falling film evaporator and a use method thereof, so that the film can be uniformly distributed no matter whether liquid is supplied by a liquid distributor or not, the liquid distribution flow can be intelligently regulated, and the vapor preheating can be effectively utilized, and meanwhile, the film distribution non-uniformity caused by the vapor influence is avoided.
The technical scheme of the invention is as follows:
An intelligent liquid distribution device for a falling film evaporator comprises a shell, and a feed pipe, a primary liquid distribution unit, a pressurizing unit, an intelligent liquid distribution unit, a tube array and a discharge pipe which are sequentially arranged in the shell from top to bottom;
the feeding pipe is connected with the primary liquid distribution unit, the primary liquid distribution unit is connected with the pressurizing unit, the pressurizing unit is connected with the intelligent liquid distribution unit, the intelligent liquid distribution unit distributes liquid to the tube array, and the tube array is connected with the discharging pipe.
As a preferable technical scheme of the invention, the primary liquid distribution unit comprises a liquid distribution disc and a plurality of liquid outlets arranged at the bottom of the liquid distribution disc, wherein the liquid distribution disc receives liquid from a feeding pipe, and the liquid flows to the pressurizing unit through the liquid outlets.
As a preferable technical scheme of the invention, the pressurizing unit comprises a reducer pipe and a pressurizing pump, wherein a large opening at the upper part of the reducer pipe is connected with a corresponding liquid outlet on the liquid distribution disc, and a small opening at the lower part of the reducer pipe is connected with the pressurizing pump.
Further, the booster pump adopts a variable frequency pump to realize the function of controlling the revolution to achieve the purpose of adjusting the flow and the pressure.
As a preferable technical scheme of the intelligent liquid distribution unit, the intelligent liquid distribution unit comprises a liquid storage disc and a plurality of liquid distribution pipes connected with the liquid storage disc, and each liquid distribution pipe is sequentially provided with a regulating valve, a flowmeter and a matching port;
the liquid storage disc is used for storing high-pressure flow from the booster pump, and the matching port is connected with the tube array.
According to the optimal technical scheme, the regulating valve adopts pid control, the valve opening of the regulating valve is regulated according to the flow of the flowmeter, when the flow meter indicates that the flow meter is too large, the regulating valve reduces the valve opening, and when the flow meter indicates that the flow meter is too small, the regulating valve increases the valve opening, so that the liquid distribution pipe is ensured to be filled with liquid.
As a preferable technical scheme of the invention, each matching port is connected with a plurality of falling film reboiler pipe orifices in the tube array.
The application method of the intelligent liquid distribution device comprises the following steps:
S1, in a primary liquid distribution unit, a liquid distribution disc receives liquid from a front system through a feed pipe, the liquid distribution disc forms a liquid level with a certain height, and the liquid goes to a corresponding pressurizing unit through a plurality of liquid outlets;
S2, in the pressurizing unit, liquid enters the pressurizing pump through the reducing pipe, is pressurized by the pressurizing pump and is conveyed to the intelligent liquid distribution unit;
S3, in the intelligent liquid distribution unit, high-pressure liquid enters the liquid storage disc, the regulating valve is controlled by pid, the opening of the valve is regulated according to the flow of the flowmeter, the liquid filling in the liquid distribution pipe is ensured, and finally the liquid flows to the tube array through the matching port.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the primary liquid distribution unit and the pressurizing unit are arranged, so that the liquid distribution disc does not need to be ensured to be completely horizontal, and secondly, the pressurizing unit ensures that the liquid is uniformly distributed, so that the liquid flow regulating range is wider.
2. According to the invention, the liquid film flow in the evaporation tube can be adjusted on line through the primary liquid distribution unit, the pressurizing unit and the intelligent liquid distribution unit, so that the device is favorable for adapting to the change of the flow, on one hand, when the film forming flow in the evaporation tube does not meet the requirement, the device can be adjusted on line, the shutdown and the disassembly are not needed, and the operation of the evaporator is continuous.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic diagram of the overall structure of an intelligent liquid distribution device for a falling film evaporator according to an embodiment of the invention.
Fig. 2 is a schematic partial view of a primary liquid distribution unit, a pressurizing unit and an intelligent liquid distribution unit according to an embodiment of the present invention.
Fig. 3 is an overall schematic diagram of the primary liquid distribution unit, the pressurizing unit and the intelligent liquid distribution unit in the embodiment of the invention.
The device comprises a feeding pipe 1, a casing 2, a liquid distribution plate 31, a liquid outlet 32, a reducing pipe 33, a booster pump 34, a liquid storage plate 35, a liquid distribution pipe 36, a regulating valve 37, a 38, a flowmeter 39, a matching port 4, a tube array 5 and a discharging pipe.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The features of the following examples and embodiments may be combined with each other without any conflict.
As shown in figures 1-3, the intelligent liquid distribution device for the falling film evaporator comprises a feed pipe 1, a shell 2, a tube array 4, a discharge pipe 5, a primary liquid distribution unit, a pressurizing unit and an intelligent liquid distribution unit.
The inlet pipe 1 is connected with a primary liquid distribution unit, the primary liquid distribution unit is connected with a pressurizing unit, the pressurizing unit is connected with an intelligent liquid distribution unit, the intelligent liquid distribution unit distributes liquid to the tube array 4, and the tube array 4 is connected with the discharge pipe 5. The feeding pipe 1, the tube array 4, the discharging pipe 5, the primary liquid distribution unit, the pressurizing unit and the intelligent liquid distribution unit are contained in the shell 2.
The primary liquid distribution unit is provided with a liquid distribution disc 31, the bottom of the liquid distribution disc is provided with a plurality of liquid outlet ports 32, the liquid distribution disc 31 can receive liquid from a front system, and the liquid can flow to the liquid outlet ports 32.
The pressurizing unit is provided with a reducing pipe 33 and a pressurizing pump 34, wherein the reducing pipe 33 is connected with the liquid distribution disc 31 at a large opening, the pressurizing pump 34 is connected with a small opening, and the pressurizing pump 34 can convey liquid and pressurize. The booster pump 34 adopts a variable frequency pump, and can realize the function of controlling the revolution to adjust the flow and the pressure.
The intelligent liquid distribution unit is provided with a liquid storage disc 35, the liquid storage disc 35 is provided with a plurality of liquid distribution pipes 36, and the liquid distribution pipes 36 are connected with a regulating valve 37, a flowmeter 38 and a matching port 39.
The reservoir 35 may store high pressure flow from the booster pump 34.
The regulating valve 37 can regulate the valve opening according to the flow of the flowmeter 38, when the flowmeter 38 indicates that the flow is too large, the regulating valve 37 reduces the valve opening, and when the flowmeter 38 indicates that the flow is too small, the regulating valve 37 increases the valve opening, so that the liquid distribution pipe 36 can be ensured to be filled with liquid;
the matching ports 39 are connected to the tubes of the falling film reboiler, and one matching port may be connected to several falling film reboiler tubes.
The application method of the intelligent liquid distribution device comprises the following steps:
S1, in a primary liquid distribution unit, a liquid distribution disc 31 receives liquid from a front system through a feed pipe 1, a liquid level with a certain height is formed on the liquid distribution disc 1, and the liquid is sent to a corresponding pressurizing unit through a plurality of liquid outlet 32;
S2, in the pressurizing unit, liquid enters the booster pump 34 through the reducer pipe 3, and the liquid is pressurized by the booster pump 34 and is conveyed to the intelligent liquid distribution unit;
S3, in the intelligent liquid distribution unit, high-pressure liquid enters the liquid storage disc 35, the regulating valve 37 is controlled by pid, the opening of the valve is regulated according to the flow of the flowmeter 38, the liquid filled in the liquid distribution pipe 36 is ensured, and finally the liquid flows to the tube array 4 through the matching port 36.
According to the invention, the primary liquid distribution unit and the pressurizing unit are arranged, so that the liquid distribution disc does not need to be ensured to be completely horizontal, and secondly, the pressurizing unit ensures that the liquid is uniformly distributed, so that the liquid flow regulating range is wider.
According to the invention, the liquid film flow in the evaporation tube can be adjusted on line through the primary liquid distribution unit, the pressurizing unit and the intelligent liquid distribution unit, so that the device is favorable for adapting to the change of the flow, on one hand, when the film forming flow in the evaporation tube does not meet the requirement, the device can be adjusted on line, the shutdown and the disassembly are not needed, and the operation of the evaporator is continuous.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by persons skilled in the art that the present invention is not limited by the foregoing description of embodiments, which are given by way of example only, and not as a limitation, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202510027779.4A CN119733255A (en) | 2025-01-08 | 2025-01-08 | Intelligent liquid distribution device for falling film evaporator and use method thereof |
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| CN202510027779.4A CN119733255A (en) | 2025-01-08 | 2025-01-08 | Intelligent liquid distribution device for falling film evaporator and use method thereof |
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