CN106517449B - Solution regeneration device capable of improving current efficiency - Google Patents

Abstract

The invention discloses a solution regeneration device capable of improving current efficiency, which comprises a solution consumption loop, a regeneration solution loop and a power supply, wherein the regeneration solution loop comprises a regeneration solution tank and a regeneration chamber of a solution regenerator, an outlet of the regeneration solution tank is connected with an inlet of the regeneration chamber, and an outlet of the regeneration chamber is connected with an inlet of the regeneration solution tank; the consumption solution loop comprises an anode chamber, a cathode chamber and a desalting chamber of the solution regenerator, and a consumption solution tank, a first production tank and a second production tank; an outlet of the consumption solution tank is connected with an inlet of the desalting chamber, an outlet of the desalting chamber is respectively connected with an inlet of the anode chamber and an inlet of the cathode chamber, an outlet of the anode chamber is connected with an inlet of the first production tank, and an outlet of the cathode chamber is connected with an inlet of the second production tank; the anode of the power supply is connected with the anode of the solution regenerator, and the cathode of the power supply is connected with the cathode of the solution regenerator. The regeneration device can realize regeneration of the regeneration solution in the solution dehumidification air-conditioning system, and improve the current efficiency in the regeneration process.

Description

A solution regeneration device that can improve current efficiency

technical field

The invention belongs to the technical fields of energy storage air conditioners and chemical production, and in particular relates to a solution regeneration device capable of improving current efficiency.

Background technique

In recent years, the energy shortage problem caused by traditional refrigeration and air-conditioning equipment in buildings has become increasingly serious, and the use of heat and humidity independent treatment methods can significantly reduce the energy consumption of heat and humidity environment control systems. Therefore, the adjustment methods of heat and humidity independent treatment have received extensive attention. Among many air conditioning systems with independent heat and humidity treatment, solution dehumidification air conditioning system is a new type of air conditioning method with great potential based on liquid hygroscopic agent dehumidification technology. Electrodialysis is one of the membrane separation technologies. It is an electrochemical separation process in which the electrolyte is separated from the solution under the action of a DC electric field, using the potential difference as the driving force and using the selective permeability of the ion exchange membrane. During the operation of the electrodialyser, the concentration of the solution in some compartments (concentration chambers) increases and in other compartments (desalination chambers) the concentration of solution decreases. Most of the dehumidifiers (lithium chloride solution, calcium chloride solution, lithium bromide solution) used in the solution dehumidification air conditioning system are electrolyte solutions, and the regeneration process of the dehumidifier is essentially the process of solution concentration. Therefore, a new method of regeneration of electrodialysis solution can be obtained by using the electrodialysis method.

However, the electrode chamber of the electrodialysis regenerator will continuously undergo polarization reaction and consume the extremely aqueous solution during the operation process, so the extremely aqueous solution needs to be replenished in time during the operation of the electrodialysis regenerator. The electrodialysis regenerator realizes the regeneration of the dehumidifying solution by migrating the solute ions in the desalination chamber to the regeneration chamber. Therefore, the polarization reaction in the electrode chamber does not help the solution regeneration and also causes the waste of the extremely aqueous solution, and further Increased material costs for electrodialysis regenerator operation. On the other hand, the polarization reaction of the electrode chamber of the electrodialysis regenerator will generate halogen gas. The halogen gas is highly irritating and toxic, and the direct discharge will cause certain harm to the environment, and the treatment of the halogen gas will increase the electrodialysis The operating cost of the regenerator. In addition, in the solution dehumidification air conditioning system, the dehumidification solution usually has a relatively high concentration. For example, when a lithium chloride solution is used as the dehumidifying solution, its mass concentration range is usually about 35%. When the traditional electrodialysis regenerator is used to regenerate the dehumidifying solution, the concentration of the desalination chamber solution and the extremely aqueous solution should be similar to that of the regeneration chamber solution, otherwise a large concentration difference will cause the solute in the regeneration chamber solution to move to the adjacent compartment. A large amount of migration in the solution of the electrodialysis regenerator weakens the actual regeneration effect of the electrodialysis regenerator, resulting in a lower current efficiency of the electrodialysis regenerator. For example, when lithium chloride solution is used as the dehumidifying solution, the mass concentration range of the solution in the regeneration chamber of the electrodialysis regenerator and the solution in the desalination chamber is about 35%, and the mass concentration range of the extremely aqueous solution is 15-20%. The concentration difference between the electrode chamber solutions is about 20%, and the experimental results show that the current efficiency of the electrodialysis regenerator is only about 50%. This increases the power consumption of the electrodialysis regenerator, but the higher concentration of the desalination chamber solution and the electrode chamber solution will lead to higher material costs during the operation of the electrodialysis regenerator, so the actual electrodialysis regenerator will use a lower concentration electrode. aqueous solution. For example, when a lithium chloride solution is used as the dehumidifying solution, the mass concentration range of the extremely aqueous solution is 15-20%. That is, at the expense of sacrificing current efficiency, the material cost in the operation of the electrodialysis regenerator is reduced.

SUMMARY OF THE INVENTION

Technical problem: The purpose of the present invention is to provide a solution regeneration device that can improve the current efficiency, realize the regeneration of the regeneration solution in the solution dehumidification air conditioning system, and improve the current efficiency in the regeneration process.

Technical solution: In order to solve the above technical problems, the embodiment of the present invention provides a solution regeneration device that can improve the current efficiency. The regeneration device includes a consumption solution circuit, a regeneration solution circuit and a power supply, wherein,

The regeneration solution circuit includes a regeneration solution tank and a regeneration chamber of a solution regenerator, the outlet of the regeneration solution tank is connected to the inlet of the regeneration chamber through a first solution pump, and the outlet of the regeneration chamber is connected to the inlet of the regeneration solution tank; the consumption solution loop includes The anode chamber, cathode chamber and desalination chamber of the solution regenerator, as well as the consumption solution tank, the first production tank and the second production tank; the outlet of the consumption solution tank is connected with the inlet of the desalination chamber through the second solution pump, and the outlet of the desalination chamber is respectively connected with the anode chamber The inlet is connected to the inlet of the cathode chamber, the outlet of the anode chamber is connected to the inlet of the first production tank, and the outlet of the cathode chamber is connected to the inlet of the second production tank; the positive electrode of the power supply is connected to the anode of the solution regenerator, and the negative electrode of the power supply is connected to the Cathode connection.

As a preferred example, the solution regenerator is provided with an anode, an anode chamber, a desalination chamber, a regeneration chamber, a cathode chamber and a cathode in sequence, an anion exchange membrane is arranged between the anode chamber and the desalination chamber, and an anion exchange membrane is arranged between the desalination chamber and the regeneration chamber. There is a cation exchange membrane, and an anion exchange membrane is arranged between the regeneration chamber and the cathode chamber.

As a preferred example, the power source is a DC power source.

As a preferred example, the mass concentration of the depleted solution flowing out of the desalination chamber is 2-5% smaller than that of the regeneration solution flowing into the regeneration chamber; the mass concentration of the depleted solution flowing into the desalination chamber is less than or equal to the regeneration solution flowing into the regeneration chamber mass concentration.

As a preferred example, the solution in the consumption solution tank is a consumption solution with a mass concentration of 35%; the solution in the regeneration solution tank is a regeneration solution with a mass concentration of 35%; the mass concentration of the regeneration solution flowing into the regeneration chamber is 35% , the mass concentration of the regeneration solution flowing out of the regeneration chamber is 37~40%; the mass concentration of the consumption solution flowing into the desalination chamber is 35%, and the mass concentration of the consumption solution flowing out of the desalination chamber is 30~33%.

As a preferred example, the consumption solution is lithium chloride or lithium bromide solution, and the regeneration solution is lithium chloride or lithium bromide solution.

Beneficial effects: Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

In the regeneration device of the embodiment of the present invention, the outlet of the desalination chamber of the solution regenerator is respectively connected with the inlet of the anode chamber of the solution regenerator and the inlet of the cathode chamber of the solution regenerator, and the consumed solution with reduced mass concentration in the desalination chamber is used to supply the outlet of the solution regenerator. The electrode chamber, and the mass concentration of the consumed solution in the anode chamber and the cathode chamber is 2-5% lower than the mass concentration of the regeneration solution in the regeneration solution tank. This improves the current efficiency of the solution regeneration device and reduces the energy consumption of the solution regeneration device. At the same time, the halogen gas, hydrogen gas and basic salt solution required in the chemical field generated by the polarization reaction in the electrode chamber are collected by the inlets of the first production tank and the second production tank, which avoids the unnecessary waste of the extremely aqueous solution in the electrode chamber, and also reduces the waste of the electrode chamber. Saves running costs when handling halogen gases.

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention.

In the figure: solution regenerator 1, anode chamber 101, anode chamber inlet 1011, anode chamber outlet 1012, cathode chamber 102, cathode chamber inlet 1021, cathode chamber outlet 1022, regeneration chamber 103, regeneration chamber inlet 1031, regeneration chamber outlet 1032 , desalination chamber 104, desalination chamber inlet 1041, desalination chamber outlet 1042, anode 105, cathode 106, regeneration solution tank 2, regeneration solution tank outlet 201, regeneration solution tank inlet 202, consumption solution tank 3, consumption solution tank outlet 301, consumption Solution tank inlet 302 , first production tank 4 , first production tank inlet 401 , second production tank 5 , second production tank inlet 501 , power source 6 , first solution pump 7 , second solution pump 8 .

Detailed ways

The technical solutions of the embodiments of the present invention will be further described below with reference to the accompanying drawings.

As shown in FIG. 1 , a solution regeneration device capable of improving current efficiency according to an embodiment of the present invention includes a consumption solution circuit, a regeneration solution circuit and a power source 6 . The regeneration solution circuit includes the regeneration chamber 103 of the solution regenerator 1 and the regeneration solution tank 2. The regeneration solution tank outlet 201 is connected to the regeneration chamber inlet 1031 through the first solution pump 7, and the regeneration chamber outlet 1032 and the regeneration solution tank inlet 202. connect. The consumption solution circuit includes the anode chamber 101, the cathode chamber 102 and the desalination chamber 104 of the solution regenerator 1, as well as the consumption solution tank 3, the first production tank 4 and the second production tank 5; the outlet 301 of the consumption solution tank passes through the second solution The pump 8 is connected to the inlet 1041 of the desalination chamber, the outlet 1042 of the desalination chamber is connected to the inlet 1011 of the anode chamber and the inlet 1021 of the cathode chamber, the outlet 1012 of the anode chamber is connected to the inlet 401 of the first production tank, the outlet 1022 of the cathode chamber is connected to the inlet 501 of the second production tank connect. The positive electrode of the power source 6 is connected to the anode 105 of the solution regenerator 1 , and the negative electrode of the power source 6 is connected to the cathode 106 of the solution regenerator 1 .

In the device of the above embodiment, the consumption solution circuit and the regeneration solution circuit share the same solution regenerator 1 . The solution regenerator 1 is provided with an anode 105 , an anode chamber 101 , a desalination chamber 104 , a regeneration chamber 103 , a cathode chamber 102 and a cathode 106 in sequence. Preferably, the power source 6 is a DC power source.

When the device of the above embodiment is working, for the regeneration solution circuit, the regeneration solution is pressurized from the regeneration solution tank 2 by the first solution pump 7 into the regeneration chamber 103 of the solution regenerator 1 . After the regeneration solution and the consumed solution in the desalination chamber 104 undergo a mass transfer process, the concentration increases from a dilute solution to a concentrated solution; then the concentrated solution flows back into the regeneration solution tank 2 to complete the closed cycle of the regeneration solution.

For the consumption solution loop, the consumption solution is pressurized from the consumption solution tank 3 by the second solution pump 8 into the desalination chamber 104 of the solution regenerator. In the desalination chamber 104, after the consumption solution and the regeneration solution in the regeneration chamber 103 undergo a mass transfer process, the concentration decreases and becomes a dilute solution; then the dilute solution enters the anode chamber 101 and the cathode chamber 102, and through the control power supply 6, in the A polarization reaction occurs between the anode chamber and the cathode chamber, the extremely aqueous solution in the anode chamber 101 reacts to generate halogen gas, and the halogen gas is discharged into the first production tank 4, and the extremely aqueous solution in the cathode chamber 102 reacts to generate hydrogen and basic salt solution, and the hydrogen And the basic salt solution is discharged into the second production tank 5, thereby completing the open circulation of the consumed solution. By setting the first production tank 4 and the second production tank 5, halogen gas, hydrogen gas and basic salt solution are collected, which can be used as materials for corresponding chemical enterprises.

In the device of the above embodiment, preferably, the mass concentration of the depleted solution flowing out of the desalination chamber 104 is 2-5% lower than the mass concentration of the regeneration solution flowing into the regeneration chamber 103; the mass concentration of the depleted solution flowing into the desalination chamber 104 Less than or equal to the mass concentration of the regeneration solution flowing into the regeneration chamber 103 . The mass concentration of the consumed solution flowing out of the desalination chamber 104 is 2-5% lower than the mass concentration of the regeneration solution flowing into the regeneration chamber 103, which can improve the current efficiency and reduce the energy consumption. For example, the solution in the consumption solution tank 3 is a consumption solution with a mass concentration of 35%; the solution in the regeneration solution tank 2 is a regeneration solution with a mass concentration of 35%. The mass concentration of the regeneration solution flowing into the regeneration chamber 103 is 35%, and the mass concentration of the regeneration solution flowing out of the regeneration chamber 103 is 37-40%. The mass concentration of the depleted solution flowing into the desalination chamber 104 is 35%, and the mass concentration of the depleted solution flowing out of the desalination chamber 104 is 30-33%. The consumption solution is lithium chloride or lithium bromide solution, and the regeneration solution is lithium chloride or lithium bromide solution.

In the apparatus of the above-described embodiment, the anode chamber 101 and the cathode chamber 102 are supplied with a depleted solution with a reduced concentration in the desalination chamber 104 . Structurally, the anode chamber 101 and the cathode chamber 102 are supplied with a depleted solution with a reduced concentration in the desalination chamber 104, so that the regeneration device does not need to set up an extremely aqueous solution tank, and no additional extremely aqueous solution circulation is required, which greatly reduces regeneration. The material cost during the operation of the device simplifies the device structure.

Functionally, the mass concentration of the depleted solution entering the desalination chamber is slightly higher than the mass concentration of the depleted solution exiting the desalination chamber. In this way, the mass concentration of the extremely aqueous solution is not much different from the mass concentration of the regeneration solution in the regeneration chamber and the mass concentration of the consumed solution in the desalination chamber, for example, 2-5%. This reduces the detrimental migration of solutes from the regeneration solution in the regeneration chamber to the solution in the adjacent compartment, thereby increasing the current efficiency of the solution regeneration device and reducing the energy consumption of the entire device.

In the solution regeneration device of this embodiment, under the action of the DC electric field, the anions and cations in the solution migrate to the anode and the cathode, and through the action of the cation exchange membrane and the anion exchange membrane, the concentration of the solution in the regeneration chamber 103 increases, and the desalination chamber 104 The reduction of the concentration of the solution in the desalination chamber 104 essentially means that part of the solute in the solution in the desalination chamber 104 is transferred to the solution in the regeneration chamber 103 . Therefore, theoretically speaking, the more solute in the solution in the regeneration chamber 103, the less solute in the solution in the desalination chamber 104, resulting in an increase in the concentration of the solution in the regeneration chamber 103 and a decrease in the concentration of the solution in the desalination chamber 104. The solution dehumidifying air conditioner requires the mass concentration of the dehumidifying solution to be 37-40%, so the mass concentration of the solution in the regeneration chamber 103 is adjusted by adjusting the supply current of the power supply 6 . The larger the current is, the more the concentration of the solution in the regeneration chamber 103 increases. Therefore, the current is adjusted to ensure that the mass concentration of the regeneration solution flowing out of the regeneration chamber 103 is 37-40%. When the mass concentration of the regeneration solution flowing out from the regeneration chamber 103 is 37-40%, the mass concentration of the consumption solution flowing out from the desalination chamber 104 is correspondingly 30-33%.

An example is given below.

The regeneration solution is lithium chloride solution. When the regeneration solution flows out from the regeneration solution tank 2, it is a dilute solution with a mass concentration of 35%. The regeneration solution flows from the regeneration solution tank 2 into the regeneration chamber 103 by the first solution pump 7 . After the regeneration solution and the depleted solution in the desalination chamber 104 undergo a mass transfer process, the concentration increases to form a concentrated solution with a mass concentration of 37-40%, which flows out from the regeneration chamber 103 and returns to the regeneration solution tank 2.

The consumed solution is lithium chloride solution. The consumption solution is added to the consumption solution tank 3 through the consumption solution tank inlet 302 . At this time, the consumption solution is a dilute solution with a mass concentration of 35%. The depleted solution flows from the depleted solution tank 3 into the desalination chamber 104 by the second solution pump 8 . After the consumption solution and the regeneration solution in the regeneration chamber 103 undergo a mass transfer process, the concentration decreases and becomes a dilute solution with a mass concentration of 30-33%. That is to say, the mass concentration of the depleted solution flowing into the desalination chamber 104 is greater than the mass concentration of the depleted solution flowing out of the desalination chamber 104, with a difference of 2-5%. The depleted solution flows out of the desalination chamber 104 and enters the anode chamber 101 and the cathode chamber 102 . The mass concentration of the depleted solution in the anode chamber 101 and the cathode chamber 102 is smaller than the mass concentration of the regeneration solution in the regeneration chamber 103 and also smaller than the mass concentration of the depleted solution in the desalination chamber 104 . By controlling the power source 6, polarization reactions take place in the anode compartment and the cathode compartment. During this process, in addition to the two main processes of ion electromigration and electrode reaction, concentration diffusion of electrolyte also occurs. Because the average concentration of the regeneration solution in the regeneration chamber 103 is higher than the mass concentration of the consumed solution in the desalination chamber 104, and the average mass concentration of the consumed solution in the desalination chamber is higher than that in the two electrode chambers. Under the action of the concentration difference, the electrolyte will diffuse from the high-concentration compartment to the low-concentration compartment, and the diffusion rate increases with the increase of the concentration difference. This process will reduce the concentration of the regeneration solution in the regeneration chamber 103, which will have side effects on the regeneration process of the regeneration device, thereby reducing the regeneration effect of the regeneration device under the same current condition, and reducing the current efficiency of the regeneration device, so that the regeneration device can regenerate the same solution. energy consumption increases. Therefore, compared with the concentration difference in the traditional electrodialysis regenerator, which is about 20%, the regeneration device of the embodiment of the present invention reduces the concentration difference between the electrode chamber and the regeneration chamber to only 2~5%, which weakens the concentration difference in the regeneration process. diffusion, thereby increasing the current efficiency of the regeneration device and reducing the energy consumption of the device.

In the device of the above embodiment, the extremely aqueous solution in the anode chamber 101 reacts to generate halogen gas, and the halogen gas is discharged into the first production tank 4, and the extremely aqueous solution in the cathode chamber 102 reacts to generate hydrogen and basic salt solution. The salt solution is discharged into the second production tank 5 . The first production tank 4 and the second production tank 5 are used to collect the reaction product of the extremely aqueous solution, so as to avoid direct elimination and cause environmental pollution. The first production tank 4 and the second production tank 5 collect the reaction product of the extremely aqueous solution, which can be used as a material in the chemical field to realize waste recycling.

The device of the above embodiment can regenerate the dehumidifying solution stably and efficiently under the climatic conditions of high temperature and high humidity, and can be driven by solar photovoltaic power generation, and is especially suitable for enterprises that produce halogen gas, hydrogen or basic salt solution. architecture. At the same time, the device can also use low-cost electricity at night to store energy, so as to alleviate the peak-to-valley difference in power load and achieve the purpose of improving system economy. In addition, the device can also obtain high-concentration dehumidification solution for use in the field of deep dehumidification.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above-mentioned specific embodiments, and the descriptions in the above-mentioned specific embodiments and the specification are only to further illustrate the principle of the present invention, without departing from the spirit and scope of the present invention, the present invention Various changes and modifications of the invention are also possible, all of which fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the claims and their equivalents.

Claims (6)

1. A solution regeneration device capable of improving current efficiency, characterized in that the regeneration device comprises a consumption solution circuit, a regeneration solution circuit and a power supply (6), wherein, The regeneration solution circuit comprises a regeneration solution tank (2) and a regeneration chamber (103) of the solution regenerator (1), the regeneration solution tank outlet (201) passing through the first solution pump (7) and the regeneration chamber inlet (1031) connection, the regeneration chamber outlet (1032) is connected with the regeneration solution tank inlet (202); The depleted solution circuit comprises an anode chamber (101), a cathode chamber (102) and a desalination chamber (104) of the solution regenerator (1), as well as a depleted solution tank (3), a first production tank (4) and a second production tank The tank (5); the outlet of the consumption solution tank (301) is connected to the inlet of the desalination chamber (1041) through the second solution pump (8), and the outlet of the desalination chamber (1042) is respectively connected with the inlet of the anode chamber (1011) and the inlet of the cathode chamber (1021) connection, the outlet of the anode chamber (1012) is connected to the inlet of the first production tank (401), the outlet of the cathode chamber (1022) is connected to the inlet of the second production tank (501); the mass of the consumed solution flowing out of the desalination chamber (104) The concentration is 2-5% smaller than the mass concentration of the regeneration solution flowing into the regeneration chamber (103); The positive pole of the power supply (6) is connected to the anode (105) of the solution regenerator (1), and the negative pole of the power supply (6) is connected to the cathode (106) of the solution regenerator (1). 2. The solution regeneration device capable of improving current efficiency according to claim 1, wherein an anode (105), an anode chamber (101), and a desalination chamber (104) are arranged in the solution regenerator (1) in sequence. , regeneration chamber (103), cathode chamber (102) and cathode (106), an anion exchange membrane is arranged between anode chamber (101) and desalination chamber (104), and between desalination chamber (104) and regeneration chamber (103) A cation exchange membrane is provided, and an anion exchange membrane is provided between the regeneration chamber (103) and the cathode chamber (102). 3. The solution regeneration device capable of improving current efficiency according to claim 1, wherein the power source (6) is a DC power source. 4. The solution regeneration device capable of improving current efficiency according to claim 1, characterized in that the mass concentration of the consumed solution flowing into the desalination chamber (104) is less than or equal to the mass concentration of the regeneration solution flowing into the regeneration chamber (103) concentration. 5. The solution regeneration device capable of improving current efficiency according to any one of claims 1 to 4, wherein the solution in the consumed solution tank (3) is a consumed solution with a mass concentration of 35%; regeneration The solution in the solution tank (2) is a regeneration solution with a mass concentration of 35%; The mass concentration of the regeneration solution flowing into the regeneration chamber (103) is 35%, and the mass concentration of the regeneration solution flowing out of the regeneration chamber (103) is 37-40%; The mass concentration of the consumed solution flowing into the desalination chamber (104) is 35%, and the mass concentration of the consumed solution flowing out of the desalination chamber (104) is 30-33%. 6 . The solution regeneration device capable of improving current efficiency according to claim 5 , wherein the consumption solution is lithium chloride or lithium bromide solution, and the regeneration solution is lithium chloride or lithium bromide solution. 7 .

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