CN116062839A - Membrane distillation system and control method thereof - Google Patents
Membrane distillation system and control method thereof Download PDFInfo
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- CN116062839A CN116062839A CN202310162217.1A CN202310162217A CN116062839A CN 116062839 A CN116062839 A CN 116062839A CN 202310162217 A CN202310162217 A CN 202310162217A CN 116062839 A CN116062839 A CN 116062839A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
Abstract
The invention discloses a membrane distillation system and a control method thereof, wherein the control method of the membrane distillation system comprises the following steps: the hot side fan is arranged on a pipeline communicated between the distillation tower and the membrane component, and the hot side fan is started so that air circulates between the distillation tower and the membrane component; a second heating element in the distillation column is activated, the second heating element being used to heat the wastewater introduced into the distillation column to form water vapor. Therefore, when the hot side fan is started, air can be circulated between the distillation tower and the membrane component to increase the temperature in the distillation tower, and therefore, before the second heating element is started to heat the wastewater to form water vapor, the second heating element can quickly and stably reach the preset temperature, and the membrane distillation system can quickly generate continuous and stable water vapor.
Description
Technical Field
The invention relates to the technical field of membrane distillation, in particular to a membrane distillation system and a control method thereof.
Background
Membrane distillation is a membrane separation process using hydrophobic microporous membranes and using the pressure difference between the two sides of the membrane as the driving force for mass transfer. The membrane distillation operation condition is mild, low-grade heat source can be utilized, and the purification efficiency is high, so that the membrane distillation method is widely applied to the fields of urban sewage treatment, chemical waste liquid treatment and the like.
At present, when a membrane distillation system is used for treating wastewater, high-temperature wastewater introduced into a membrane module is generally changed into hot and humid water vapor, and then the hot and humid water vapor is introduced into the membrane module, so that the membrane flux of a hydrophobic microporous membrane in the membrane module is improved. However, the conventional membrane distillation system control method cannot provide continuous and stable hot and humid water vapor for the membrane module, so that the stability of the membrane distillation system is poor.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a membrane distillation system and a method for treating wastewater that can effectively increase membrane flux and thus increase wastewater treatment efficiency.
A method of controlling a membrane distillation system comprising the steps of:
a hot side fan is arranged on a pipeline communicated between the distillation tower and the membrane component, and the hot side fan is started so that air circulates between the distillation tower and the membrane component;
and starting a second heating element in the distillation tower, wherein the second heating element is used for heating the wastewater introduced into the distillation tower to form water vapor.
In the control method of the membrane distillation system, since the hot side fan is arranged on the pipeline communicated between the distillation tower and the membrane component, when the hot side fan is started, air can be circulated between the distillation tower and the membrane component to increase the temperature in the distillation tower, and therefore, before the second heating element is started to heat the wastewater to form water vapor, the second heating element can quickly and stably reach the preset temperature, and the membrane distillation system can quickly generate continuous and stable water vapor.
The technical scheme is further described as follows:
in one embodiment, the method further comprises the steps of:
and the water tank and the distillation tower are communicated, and the first heating piece is used for heating the wastewater in the water tank.
In one embodiment, before the first heating element is used for heating the wastewater in the water tank, the method further comprises the following steps:
judging the temperature T in the distillation tower 1 Whether or not it is greater than or equal to a first preset temperature T s1 ；
If T 1 Less than T s1 Continuously starting the hot side fan;
if T 1 Greater than or equal to T s1 And heating the wastewater in the water tank by adopting the first heating piece.
In one embodiment, the first preset temperature T s1 45 ℃.
In one embodiment, after the first heating element is used to heat the wastewater in the water tank, the method further comprises the following steps:
judging the temperature T of the wastewater in the water tank 2 Whether or not it is greater than or equal to a second preset temperature T s2 ；
If T 2 Less than T s2 Continuously heating the wastewater in the water tank by adopting the first heating element;
if T 2 Greater than or equal to T s2 And stopping heating the wastewater in the water tank by adopting the first heating element.
In one embodiment, the second preset temperature T s2 The temperature is 70-80 ℃.
In one embodiment, the method further comprises the steps of:
introducing water vapor generated in the distillation column to one side of a hydrophobic microporous membrane in the membrane module;
the cold side fan is arranged on a pipeline which is communicated between the evaporator and the membrane component, the cold side fan and the evaporator are started, and the evaporator is used for providing cold and wet air for the other side of the hydrophobic microporous membrane in the membrane component.
The present application also provides a membrane distillation system comprising: the water tank is used for storing wastewater, the water tank is communicated with the distillation tower, the membrane assembly comprises a hydrophobic microporous membrane, the membrane assembly is provided with a hot side inlet and a hot side outlet, the hot side inlet and the hot side outlet are respectively communicated with the distillation tower through pipelines, the hot side fan is arranged on the pipeline which is communicated with the distillation tower and the membrane assembly, and the distillation tower is used for providing water vapor to one side of the hydrophobic microporous membrane.
In one embodiment, the membrane distillation system further comprises an evaporator and a cold side fan, the membrane module is provided with a cold side inlet and a cold side outlet, the cold side inlet and the cold side outlet are respectively communicated with the evaporator through pipelines, the cold side fan is arranged on the pipeline communicated between the evaporator and the membrane module, and the condenser is used for providing cold and wet air to the other side of the hydrophobic microporous membrane.
In one embodiment, the membrane distillation system further comprises a compressor, the second heating element comprises a condenser, the condenser is arranged in a distillation tower, and the condenser is used for changing wastewater introduced into the distillation tower into water vapor; the refrigerant outlet of the condenser is communicated with the refrigerant inlet of the evaporator, the refrigerant outlet of the evaporator is communicated with the inlet of the compressor, and the outlet of the compressor is communicated with the refrigerant inlet of the condenser.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Moreover, the figures are not drawn to a 1:1 scale, and the relative sizes of various elements are merely exemplary in the figures, and are not necessarily drawn to true scale. In the drawings:
FIG. 1 is a schematic diagram of a membrane distillation system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the construction of a membrane distillation system according to an embodiment of the present invention.
The elements in the figures are labeled as follows:
10. a membrane distillation system; 110. a water tank; 111. a first heating member; 120. a distillation column; 121. a first steam outlet; 122. a first steam inlet; 123. a water outlet; 130. a membrane module; 131. a hot side inlet; 132. a hot side outlet; 133. a cold side inlet; 134. a cold side outlet; 140. a hot side fan; 150. an evaporator; 151. a second steam outlet; 152. a second steam inlet; 160. an air cooler; 170. a second heating member; 171. a condenser; 172. a second electric heating tube; 180. a compressor; 190. and a spraying mechanism.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
Referring to fig. 1 and 2, one embodiment of the present application provides a membrane distillation system 10 comprising: water tank 110, distillation column 120, membrane module 130, and hot side blower 140. The water tank 110 is used for storing wastewater and the water tank 110 is in communication with the distillation column 120. The membrane module 130 comprises a hydrophobic microporous membrane, and the membrane module 130 is provided with a hot side inlet 131 and a hot side outlet 132. The hot side inlet 131 and the hot side outlet 132 are respectively communicated with the distillation column 120 through pipes. A hot side blower 140 is provided on a line communicating between the distillation column 120 and the membrane module 130. The distillation column 120 is used to provide water vapor to one side of the hydrophobic microporous membrane.
Specifically, the distillation column 120 is provided with a first vapor outlet 121 and a first vapor inlet 122, wherein the first vapor outlet 121 communicates with the hot side inlet 131 through a pipe, and the first vapor inlet 122 communicates with the hot side outlet 132 through a pipe. Specifically, the pipe that communicates the first steam outlet 121 with the hot side inlet 131 is referred to as a first hot side pipe, and the pipe that communicates the first steam inlet 122 with the hot side outlet 132 is referred to as a second hot side pipe.
In this embodiment, the "the hot side blower 140 is disposed on the pipeline that communicates between the distillation column 120 and the membrane module 130" may be understood as that the hot side blower 140 is disposed on the first hot side pipe or the second hot side pipe. In this manner, when only hot side blower 140 is activated, air may be circulated through first hot side duct and second hot side duct within distillation column 120 and membrane module 130. During the cycle, the air temperature gradually increases, thereby increasing the temperature within the distillation column 120.
In the membrane distillation system 10 described above, after the wastewater in the water tank 110 passes through the distillation column 120, the distillation column 120 may convert the wastewater into water vapor and pass through the first hot side pipe to one side of the hydrophobic microporous membrane in the membrane module 130.
Referring to fig. 1 and 2, in one embodiment, the membrane distillation system 10 further includes an evaporator 150 and an air cooler 160. The membrane module 130 is provided with a cold side inlet 133 and a cold side outlet 134. The cold side inlet 133 and the cold side outlet 134 are respectively in communication with the evaporator 150 through pipes. An air cooler 160 is provided on a line communicating between the evaporator 150 and the membrane module 130. The condenser 171 is used to supply cool humid air to the other side of the hydrophobic microporous membrane.
Specifically, the evaporator 150 is provided with a second steam outlet 151 and a second steam inlet 152, wherein the second steam outlet 151 communicates with the cold side inlet 133 through a pipe, and the second steam inlet 152 communicates with the cold side outlet 134 through a pipe. Specifically, the line connecting the second steam outlet 151 and the cold side inlet 133 is referred to as a first cold side pipe, and the line connecting the second steam inlet 152 and the cold side outlet 134 is referred to as a second cold side pipe.
In this embodiment, the "the air cooler 160 is disposed on the pipeline that communicates between the evaporator 150 and the membrane module 130" may be understood as that the air cooler 160 is disposed on the first cold side pipe or the second cold side pipe.
Optionally, in one embodiment, the membrane distillation system 10 includes an evaporator 150. Alternatively, the membrane distillation system 10 includes at least two evaporators 150, and when the membrane distillation system 10 includes two or more evaporators 150, a plurality of evaporators 150 may be disposed in series.
In the membrane distillation system 10 described above, when the evaporator 150 is operated, the evaporator 150 may introduce cool humid air to the other side of the hydrophobic microporous membrane in the membrane module 130 through the first cold side pipe. Because the temperature difference is formed at the two sides of the hydrophobic microporous membrane, water vapor can pass through micropores on the hydrophobic microporous membrane under the action of the pressure difference and can transfer heat and mass with cold and wet air. Since the water vapor passing into the membrane module 130 cannot pass completely through the hydrophobic microporous membrane, the water vapor that does not pass is returned directly from the hot side outlet 132 into the distillation column 120.
In order to fully utilize the heat generated by the membrane distillation system 10, in one embodiment, as shown in fig. 1 and 2, the distillation column 120 is provided with a water outlet 123. The water outlet 123 is communicated with the water tank 110 through a pipeline. Because the wastewater is evaporated in the distillation tower 120 to form the concentrated water with higher temperature, the concentrated water can be introduced into the water tank 110 through the water outlet 123, so that the wastewater to be treated in the water tank 110 can be heated, when the temperature of the wastewater introduced into the distillation tower 120 is higher, the wastewater can be favorable for quickly forming the water vapor in the distillation tower 120, and the continuous stable water vapor is provided for the membrane component 130, so that the stability of the membrane distillation system 10 is higher.
In one embodiment, as shown in fig. 1 and 2, a first heating member 111 is provided in the water tank 110. The first heating member 111 serves to heat the waste water in the water tank 110. In this way, it is ensured that the distillation column 120 can rapidly and stably produce water vapor in the early operation stage.
Specifically, in the present embodiment, the first heating element 111 is a first electric heating tube.
In one embodiment, as shown in FIG. 1, a second heating element 170 is provided within the distillation column 120. The second heating member 170 serves to change the waste water introduced into the distillation column 120 into water vapor.
Referring to fig. 1 and 2, in one embodiment, the membrane distillation system 10 further includes a compressor 180. The second heating member 170 includes a condenser 171. A condenser 171 is provided in the distillation column 120, and the condenser 171 serves to convert wastewater introduced into the distillation column 120 into water vapor. The refrigerant outlet of the condenser 171 communicates with the refrigerant inlet of the evaporator 150, the refrigerant outlet of the evaporator 150 communicates with the inlet of the compressor 180, and the outlet of the compressor 180 communicates with the refrigerant inlet of the condenser 171.
In the present embodiment, the condenser 171, the evaporator 150 and the compressor 180 which are connected by the refrigerant line can be regarded as a common heat pump system, so the working principle among the three is not described here again.
In this embodiment, as shown in fig. 2, the condenser 171 is directly disposed in the distillation tower 120, and the way of heating the wastewater by the condenser 171 to form water vapor is beneficial to the energy generated by the heat pump system, so that the energy utilization rate of the whole membrane distillation system 10 is further improved.
Alternatively, in other embodiments, the waste water tank 110 may be disposed within the distillation column 120, such that heat loss from the waste water during transport may be prevented.
Alternatively, in other embodiments, the membrane module 130 may be disposed within the distillation column 120, thus preventing heat loss from the water vapor during transport.
Alternatively, in other embodiments, as shown in fig. 1 and 2, the second heating member 170 includes a second electric heating tube 172. As such, the wastewater may also be heated by the second electric heating tube 172 to form water vapor.
Alternatively, in other embodiments, the second electric heating pipe 172 and the condenser 171 may be used simultaneously to evaporate the wastewater introduced into the distillation column 120. Alternatively, the condenser 171 may be started first and then the second electric heating pipe 172 may be started to evaporate the wastewater introduced into the distillation column 120. Alternatively, the second electric heating pipe 172 may be started first and then the condenser 171 may be started to evaporate the wastewater introduced into the distillation column 120. Alternatively, only the condenser 171 may be used alone to evaporate the wastewater introduced into the distillation column 120.
Specifically, the selection can be made according to actual requirements. For example: in order to improve the evaporation efficiency of the distillation tower 120 on the wastewater, the second electric heating pipe 172 and the condenser 171 may be used to heat and evaporate the wastewater. When the flow rate of the wastewater is small, the condenser 171 may be independently started to heat and evaporate the wastewater in order to reduce the energy consumption.
Specifically, in the present embodiment, the wastewater is heated by the second electric heating pipe 172 to generate water vapor, and then the condenser 171 is turned on to heat the wastewater. At the same time, the condensing temperature of the condenser 171 is controlled to be about 95 ℃.
In order to control the condensing temperature of the condenser 171 to be about 95 ℃, in one embodiment, the refrigerant used in the heat pump system is a refrigerant of HFO type, for example: r515b, etc. Such refrigerants may enable performance of the heat pump system to be optimized.
Referring to fig. 1 and 2, in one embodiment, a spray mechanism 190 and a sprinkler mechanism (not shown) are provided within the distillation column 120. Wherein, the spraying mechanism 190 and the sprinkling mechanism are connected with the water tank 110 through pipelines. Specifically, the spraying mechanism 190 sprays the waste water to form water droplets, and the water droplets contact and evaporate with the second electric heating pipe 172 and the condenser 171 to form wet and hot waste water vapor. The sprinkling mechanism is arranged above the second electric heating pipe 172 and the condenser 171, and sprinkles water, and water drops contact with the condenser 171 and the second electric heating pipe 172 to evaporate to form water vapor.
An embodiment of the present application further provides a control method of the membrane distillation system 10, including the following steps:
the hot side blower 140 is arranged on a pipeline communicated between the distillation tower 120 and the membrane assembly 130, and the hot side blower 140 is started so as to circulate air between the distillation tower 120 and the membrane assembly 130;
the second heating member 170 in the distillation column 120 is activated, and the second heating member 170 is used to heat the wastewater introduced into the distillation column 120 to form water vapor.
In the control method of the membrane distillation system 10, since the hot side fan 140 is disposed on the pipeline connecting the distillation tower 120 and the membrane module 130, when the hot side fan 140 is started, air can be circulated between the distillation tower 120 and the membrane module 130 to raise the temperature in the distillation tower 120, so that the second heating element 170 can be quickly and stably brought to the preset temperature before the second heating element 170 is started to heat the wastewater to form water vapor, and thus the membrane distillation system 10 can quickly generate continuous and stable water vapor.
In an embodiment, the method further comprises the steps of:
the water tank 110 and the distillation column 120 are connected, and the waste water in the water tank 110 is heated by the first heating member 111. By heating the wastewater in advance, rapid formation of water vapor is facilitated by the wastewater being passed into the distillation column 120.
In one embodiment, before the first heating member 111 is used to heat the wastewater in the water tank 110, the method further comprises the steps of:
determining the temperature T in the distillation column 120 1 Whether or not it is greater than or equal to a first preset temperature T s1 ；
If T 1 Less than T s1 The hot side blower 140 is continuously started;
if T 1 Greater than or equal to T s1 The waste water in the water tank 110 is heated by the first heating member 111.
In this way, the temperature in the distillation column 120 can be increased by the hot side blower 140, so that the second heating member 170 in the distillation column 120 can rapidly and stably increase its temperature to a preset value after being started. Since the temperature of the second heating member 170 can be rapidly and stably increased, the distillation column 120 can continuously and stably output water vapor. By heating the wastewater in the water tank 110 by the first heating member 111, the temperature of the wastewater introduced into the distillation column 120 can be made high, which is advantageous in that the distillation column 120 can generate steam rapidly and stably in the early operation stage.
In one embodiment, the first preset temperature T s1 45 ℃.
Optionally, in other embodiments, the first preset temperature T s1 Can be 40 ℃, 42 ℃, 47 ℃, 50 ℃ or the like. The specific numerical values may be dependent on the actual situation, and are not limited in detail herein.
In one embodiment, after the waste water in the water tank 110 is heated by the first heating member 111, the method also comprises the following steps:
judging the temperature T of the wastewater in the water tank 110 2 Whether or not it is greater than or equal to a second preset temperature T s2 ；
If T 2 Less than T s2 The first heating member 111 is continuously used to heat the wastewater in the water tank 110;
if T 2 Greater than or equal to T s2 The heating of the waste water in the water tank 110 by the first heating member 111 is stopped.
The way of heating the wastewater introduced into the distillation column 120 in advance by the first heating member 111 is advantageous in that the distillation column 120 outputs continuously stable water vapor. Because the temperature of the concentrated water generated by evaporating the wastewater introduced into the distillation tower 120 is high and the concentrated water flows back to the water tank 110 through the water outlet 123, the temperature of the wastewater in the water tank 110 can be increased, and when the wastewater in the water tank 110 is at the temperatureDegree T 2 Reaching a second preset temperature T s2 When the first heating member 111 is turned off, energy saving is facilitated.
In one embodiment, the side wall of the water tank 110 is provided with a water inlet, an operator can supplement the waste water to be treated into the water tank 110 through the water inlet to avoid the drying phenomenon of the water tank 110, and meanwhile, when the temperature of the waste water in the water tank 110 is too high, the waste water can be introduced to control the temperature of the waste water in the water tank 110, so that the temperature of the waste water in the water tank 110 is stabilized at a second preset temperature T s2 About, it is advantageous for the distillation column 120 to stably output water vapor.
In one embodiment, the second preset temperature T s2 The temperature is 70-80 ℃.
Specifically, the second preset temperature T s2 Can be 72 ℃, 75 ℃, 77 ℃ or 79 ℃ and the like.
In an embodiment, the method further comprises the steps of:
introducing water vapor generated in the distillation column 120 to one side of the hydrophobic microporous membrane in the membrane module 130;
the cold side blower 160 is disposed on a pipeline communicating between the evaporator 150 and the membrane module 130, the cold side blower 160 and the evaporator 150 are turned on, and the evaporator 150 is used for supplying cold and humid air to the other side of the hydrophobic microporous membrane in the membrane module 130.
Water vapor is introduced through the distillation column 120 to one side of the hydrophobic microporous membrane and cool humid air is introduced through the evaporator 150 to the other side of the hydrophobic microporous membrane. Because the temperature difference is formed at the two sides of the hydrophobic microporous membrane, water vapor can pass through micropores on the hydrophobic microporous membrane under the action of the pressure difference and can transfer heat and mass with cold and wet air. Because one side of the hydrophobic microporous membrane is water vapor rather than liquid, the phenomenon that other impurities in the wastewater are directly contacted with the hydrophobic microporous membrane to cause microporous blockage can be effectively avoided, so that the continuous passage of the water vapor through the hydrophobic microporous membrane is facilitated, the membrane flux is effectively improved, and the treatment efficiency of the wastewater is improved.
In this embodiment, by turning on the cold side blower 160, the cold humid air introduced into the membrane assembly 130 is constantly carrying water vapor through the hydrophobic microporous membrane. It can be seen that the capacity for water vapor can be changed by changing the flow rate of the cool humid air by the cool side blower 160, so that the membrane flux can be effectively improved.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a 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 at least one such feature.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A method of controlling a membrane distillation system, comprising the steps of:
a hot side fan is arranged on a pipeline communicated between the distillation tower and the membrane component, and the hot side fan is started so that air circulates between the distillation tower and the membrane component;
and starting a second heating element in the distillation tower, wherein the second heating element is used for heating the wastewater introduced into the distillation tower to form water vapor.
2. The method for controlling a membrane distillation system according to claim 1, further comprising the steps of:
and the water tank and the distillation tower are communicated, and the first heating piece is used for heating the wastewater in the water tank.
3. The method of controlling a membrane distillation system according to claim 2, further comprising the steps of, before said heating the wastewater in the water tank with the first heating member:
judgment stationTemperature T in the distillation column 1 Whether or not it is greater than or equal to a first preset temperature T s1 ；
If T 1 Less than T s1 Continuously starting the hot side fan;
if T 1 Greater than or equal to T s1 And heating the wastewater in the water tank by adopting the first heating piece.
4. A method of controlling a membrane distillation system according to claim 3, wherein said first preset temperature T s1 45 ℃.
5. A control method of a membrane distillation system according to claim 3, further comprising the steps of, after said heating of the wastewater in said water tank with said first heating member:
judging the temperature T of the wastewater in the water tank 2 Whether or not it is greater than or equal to a second preset temperature T s2 ；
If T 2 Less than T s2 Continuously heating the wastewater in the water tank by adopting the first heating element;
if T 2 Greater than or equal to T s2 And stopping heating the wastewater in the water tank by adopting the first heating element.
6. The method for controlling a membrane distillation system according to claim 5, wherein said second preset temperature T s2 The temperature is 70-80 ℃.
7. The method for controlling a membrane distillation system according to any of claims 1 to 6, further comprising the steps of:
introducing water vapor generated in the distillation column to one side of a hydrophobic microporous membrane in the membrane module;
the cold side fan is arranged on a pipeline which is communicated between the evaporator and the membrane component, the cold side fan and the evaporator are started, and the evaporator is used for providing cold and wet air for the other side of the hydrophobic microporous membrane in the membrane component.
8. A membrane distillation system, comprising: the water tank is used for storing wastewater, the water tank is communicated with the distillation tower, the membrane assembly comprises a hydrophobic microporous membrane, the membrane assembly is provided with a hot side inlet and a hot side outlet, the hot side inlet and the hot side outlet are respectively communicated with the distillation tower through pipelines, the hot side fan is arranged on the pipeline which is communicated with the distillation tower and the membrane assembly, and the distillation tower is used for providing water vapor to one side of the hydrophobic microporous membrane.
9. The membrane distillation system as claimed in claim 8, further comprising an evaporator and a cold side blower, wherein the membrane module is provided with a cold side inlet and a cold side outlet, the cold side inlet and the cold side outlet being respectively communicated with the evaporator through a pipe, the cold side blower being provided on a pipe communicating between the evaporator and the membrane module, and the condenser being for supplying cold humid air to the other side of the hydrophobic microporous membrane.
10. The membrane distillation system of claim 9, further comprising a compressor, wherein the second heating element comprises a condenser disposed within a distillation column, and wherein the condenser is configured to change wastewater introduced into the distillation column into water vapor; the refrigerant outlet of the condenser is communicated with the refrigerant inlet of the evaporator, the refrigerant outlet of the evaporator is communicated with the inlet of the compressor, and the outlet of the compressor is communicated with the refrigerant inlet of the condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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