Automation equipment for treating waste alkali liquor activated by nickel screen of electrolytic cell

Abstract

The invention belongs to the technical field of green hydrogen production, and particularly relates to waste liquid treatment equipment. The invention relates to automatic equipment for treating waste alkali liquor activated by a nickel screen of an electrolytic bath. The automatic equipment comprises a waste acid liquor impurity filtering tank; a waste alkali liquid impurity filtering tank; the acid-base neutralization reaction tank is respectively communicated with output pipelines of the waste acid liquid impurity filtering tank and the waste alkali liquid impurity filtering tank; a stirrer is arranged in the acid-base neutralization reaction tank; the first-stage coarse filtering tank I and the first-stage coarse filtering tank II are respectively communicated with an output pipeline of the acid-base neutralization reaction tank; the second-stage fine filtering tank is respectively communicated with output pipelines of the first-stage coarse filtering tank I and the first-stage coarse filtering tank II; the filtrate storage tank is communicated with an output pipeline of the secondary fine filtering tank; and the control panel is used for conveying the output pipelines and controlling the stirrer. Automatic treatment of the activated waste alkali liquor can be achieved, batch treatment of the activated waste alkali liquor of the electrolytic cell is facilitated, the treatment cost of the activated waste alkali liquor is reduced, and therefore the economical efficiency and practicability of hydrogen are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of green hydrogen production, and specifically relates to a waste liquid treatment device. Background Art

[0002] In the process of achieving the dual carbon goals of "carbon peak" and "carbon neutrality" in my country, moving towards low-carbon and clean energy is an inevitable trend in promoting energy transformation. Hydrogen energy has abundant sources and wide applications. It has the characteristics of green, clean and low-carbon. It is recognized by the industry as one of the important carriers of energy transformation and development, and plays a positive supporting role in the realization of the goals of "carbon peak" and "carbon neutrality". Among them, "green hydrogen" is the key to achieving the net zero emission path, and therefore has become an important way to reduce carbon and decarbonize. Alkaline water electrolysis hydrogen production equipment plays a vital role in the green hydrogen production process due to its mature technology and low cost.

[0003] The alkaline water electrolysis hydrogen production device consists of an electrolytic cell and an auxiliary system. The core components of the alkaline electrolytic cell mainly include plates, sprayed nickel mesh, diaphragm cloth, gaskets and fasteners, among which the sprayed nickel mesh is one of the most critical core components of the alkaline electrolytic cell, which directly affects the electrolysis efficiency of the electrolytic cell and plays a decisive role in the performance, life and cost of the electrolytic cell. The sprayed nickel mesh is a mixture of nickel powder and aluminum powder in a certain proportion and then thermally sprayed on the nickel mesh. It needs to be activated before use. The activation liquid cannot be reused after a period of use, resulting in activation waste alkali liquid, which increases the cost of hydrogen production and operation to a certain extent.

[0004] With the rapid development of hydrogen energy, the gas output and volume of single electrolyzers are getting bigger and bigger, which leads to an increase in the number of chambers, an increase in the diameter of the nickel mesh, and an increase in the amount of activated waste liquid. The traditional form of entrusting professional treatment units to treat the nickel mesh activation waste liquid is no longer applicable due to the high price. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of the amount of waste alkali solution generated in batches of existing activated alkali solution and to provide an automated device for treating waste alkali solution from nickel mesh activation in electrolytic cells.

[0006] The technical solution of the present invention is: an automated device for treating waste alkali solution from nickel mesh activation in electrolytic cells, comprising:

[0007] A waste acid liquid impurity filter tank is used to filter out impurities in the waste acid liquid.

[0008] A waste alkali liquid impurity filter tank is used to filter out impurities in the waste alkali liquid.

[0009] An acid-base neutralization reaction tank is respectively connected with the output pipelines of the waste acid liquid impurity filter tank and the waste alkali liquid impurity filter tank; and a stirrer is arranged in the acid-base neutralization reaction tank.

[0010] A primary coarse filter tank I and a primary coarse filter tank II are respectively connected to the output pipeline of the acid-base neutralization reaction tank.

[0011] A secondary fine filter tank is connected to the output pipelines of the primary coarse filter tank I and the primary coarse filter tank II respectively.

[0012] A filtrate storage tank connected to the output pipeline of the secondary fine filter tank.

[0013] Control panel for conveying to each output pipeline and controlling the agitator.

[0014] In the above scheme, specifically:

[0015] A filter element I is provided in the waste acid liquid impurity filter tank to divide it into a waste acid liquid filtering chamber and a storage chamber; under the action of the filter element I, the waste acid liquid filters out impurities in the waste acid liquid, and the activated waste acid liquid with impurities removed enters the storage chamber of the waste acid liquid impurity filter tank. A delivery pump I is provided on the output pipeline of the waste acid liquid impurity filter tank.

[0016] A filter element II is provided in the waste alkali liquid impurity filter tank to divide it into a waste alkali liquid filtering chamber and a storage chamber; the activated waste alkali liquid is filtered out of impurities in the activated waste alkali liquid under the action of the filter element II, and the activated waste alkali liquid with impurities removed enters the storage chamber of the waste alkali liquid impurity filter tank. A delivery pump II is provided on the output pipeline of the waste alkali liquid impurity filter tank.

[0017] The agitator is located in the middle of the acid-base neutralization reaction tank, and has three blades distributed in the horizontal direction; the agitator is driven by a stirring motor; the activated waste alkali liquid and waste acid liquid with impurities removed enter the acid-base neutralization reaction tank under the action of delivery pumps I and II, and the waste acid-base liquids are fully mixed and reacted under the action of the agitator; a delivery pump III is provided in the output pipeline of the acid-base neutralization reaction tank.

[0018] In order to increase the filtering capacity of the coarse filter tank, two coarse filter tanks are provided, namely, the first coarse filter tank I and the first coarse filter tank II; the first coarse filter tank I is provided with a filter element III which divides it into a filter chamber and a storage chamber. The first coarse filter tank II is provided with a filter element V which divides it into a filter chamber and a storage chamber. The vacuum pumping equipment is connected to the storage chambers of the first coarse filter tank I and the first coarse filter tank II through a vacuum pumping pipeline. The acid-base neutralization liquid is transported to the filter chambers of the first coarse filter tank I and the first coarse filter tank II through a connecting pipeline and a delivery pump III. The vacuum pumping equipment sets the upper part of the filter element III and the filter element V to normal pressure and the lower part to vacuum through a vacuum pumping pipeline. The neutralization liquid forms a driving force due to the pressure difference between the upstream and downstream sides to achieve solid-liquid separation. Under the pressure difference between the upstream and downstream, the neutralization liquid passes through the filter element III and the filter element V and enters the storage chambers of the first coarse filter tank I and the first coarse filter tank II. A delivery pump IV is provided on the output pipeline of the first coarse filter tank I and the first coarse filter tank II.

[0019] A filter element IV is provided in the secondary fine filter tank; the coarse filtrate is filtered again through the filter element IV and enters the storage chamber of the secondary fine filter tank, so that the aluminum hydroxide precipitate in the acid-base neutralization waste alkali liquid is completely filtered out; a delivery pump V is provided on the output pipeline of the secondary fine filter tank.

[0020] In order to increase the storage capacity of fine filtrate, the filtrate storage tank is connected to the storage chamber of the secondary fine filtration tank through a connecting pipe and a delivery pump V, and a filtrate discharge port is provided at the bottom of the filtrate storage tank. The fine filtrate enters the filtrate storage tank through the connecting pipe and the delivery pump V, and is subsequently evaporated to obtain industrial salt.

[0021] The control panel controls the acid-base neutralization treatment equipment through control signals, completes the filtration of impurities in waste acid and waste alkali, the transportation and filtration of acid-base neutralization liquid, the control of agitator rotation, etc., to realize the automated treatment of waste alkali. An emergency stop button is provided on the control panel. In case of an emergency, the button can be quickly pressed to achieve the purpose of protection and avoid acid-base corrosion and mechanical accidents.

[0022] Beneficial effects:

[0023] (1) The present invention is highly integrated and automated, and can realize the automated treatment of activated waste alkali solution, which is convenient for batch treatment of activated waste alkali solution in electrolytic cells, reduces the treatment cost of activated waste alkali solution, and thus improves the economy and practicality of hydrogen.

[0024] (2) The control panel provided in the present invention realizes the automated processing operation of the activated waste alkali solution, and an emergency stop button can be provided on the control panel. In the event of an emergency, the button can be quickly pressed to achieve the purpose of protection and avoid acid and alkali solution corrosion and mechanical accidents.

[0025] (3) The present invention is provided with a primary coarse filtration tank and a secondary fine filtration tank; the coarse filtrate is filtered again through the filter element IV and enters the storage chamber of the secondary fine filtration tank, so that the aluminum hydroxide precipitate in the acid-base neutralization waste alkali liquid is completely filtered out. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] In the figure: 1-waste acid impurity filter tank, 2-filter element I, 3-connecting pipeline and delivery pump I, 4-waste alkali impurity filter tank, 5-filter element II, 6-connecting pipeline and delivery pump II, 7-acid-base neutralization reaction tank, 8-agitator, 9-control panel, 10-connecting pipeline and delivery pump III, 11-first-level coarse filter tank I, 12-filter element III, 13-connecting pipeline and delivery pump IV, 14-second-level fine filter tank, 15-filter element IV, 16-connecting pipeline and delivery pump V, 17-filtrate storage tank, 18-fine filtrate discharge port, 19-first-level coarse filter tank II, 20-filter element V, 21-vacuum pipeline, 22-vacuum equipment, 23-stirring motor. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] Embodiment 1:

[0030] See attached Figure 1 , an automated device for treating waste alkali solution from nickel mesh activation in electrolytic cells, comprising:

[0031] A waste acid liquid impurity filter tank 1 is provided for filtering impurities in waste acid liquid; a filter element Ⅰ2 is provided in the waste acid liquid impurity filter tank 1 for dividing it into a waste acid liquid filtering chamber and a storage chamber; a delivery pump Ⅰ3 is provided on the output pipeline of the waste acid liquid impurity filter tank 1.

[0032] A waste alkali liquid impurity filter tank 4 is provided for filtering impurities in the waste alkali liquid; a filter element II5 is provided in the waste alkali liquid impurity filter tank 4 for dividing it into a waste alkali liquid filtering chamber and a storage chamber; a delivery pump II6 is provided on the output pipeline of the waste alkali liquid impurity filter tank 4.

[0033] An acid-base neutralization reaction tank 7 is connected to the output pipelines of the waste acid impurity filter tank 1 and the waste alkali impurity filter tank 4 respectively; a stirrer 8 is arranged in the acid-base neutralization reaction tank 7; the stirrer 8 is located in the middle of the acid-base neutralization reaction tank 7, and three blades are distributed in the horizontal direction; the stirrer 8 is driven by a stirring motor 23; a delivery pump III 10 is arranged in the output pipeline of the acid-base neutralization reaction tank 7.

[0034] The primary coarse filter tank I11 and the primary coarse filter tank II19 are connected to the output pipeline of the acid-base neutralization reaction tank 7 respectively; the primary coarse filter tank I11 is provided with a filter element III12 which divides it into a filter chamber and a storage chamber. The primary coarse filter tank II19 is provided with a filter element V20 which divides it into a filter chamber and a storage chamber. The vacuum device 22 is connected to the storage chambers of the primary coarse filter tank I11 and the primary coarse filter tank II19 through the vacuum pipeline 21. The output pipelines of the primary coarse filter tank I11 and the primary coarse filter tank II19 are provided with a delivery pump IV13.

[0035] A secondary fine filter tank 14 is connected to the output pipelines of the primary coarse filter tank Ⅰ11 and the primary coarse filter tank Ⅱ19 respectively; a filter element Ⅳ15 is arranged in the secondary fine filter tank 14; and a delivery pump Ⅴ16 is arranged on the output pipeline of the secondary fine filter tank 14.

[0036] A filtrate storage tank 17 is connected to the output pipeline of the secondary fine filtration tank 14; a filtrate discharge port 18 is provided at the bottom of the filtrate storage tank 17.

[0037] A control panel 9 is provided for controlling the delivery of each output pipeline and the stirrer 8.

[0038] Embodiment 2:

[0039] Based on Example 1, the working process of an automated device for treating waste alkali solution from nickel mesh activation in an electrolytic cell is further described:

[0040] In the waste alkali liquid acid-base neutralization treatment equipment, the filter element I2 divides the waste acid liquid impurity filter tank 1 into a waste acid liquid filter chamber and a storage chamber, and the filter element I2 completes the impurity filtration of the waste acid liquid, and the waste acid liquid with impurities removed enters the storage chamber of the waste acid liquid impurity filter tank 1; the filter element II5 divides the waste alkali liquid impurity filter tank 4 into a waste alkali liquid filter chamber and a storage chamber, and the filter element II5 completes the impurity filtration of the waste alkali liquid, and the waste alkali liquid with impurities removed enters the storage chamber of the waste alkali liquid impurity filter tank 4. The connecting pipeline and the delivery pump I3 transport the waste acid liquid with impurities removed in the waste acid liquid impurity filter tank 1 to the acid-base neutralization reaction tank 7, and the connecting pipeline and the delivery pump II6 transport the waste alkali liquid with impurities removed in the waste alkali liquid impurity filter tank 4 to the acid-base neutralization reaction tank 7.

[0041] The reaction tank is the core of the acid-base neutralization treatment equipment and directly affects the acid-base neutralization treatment effect. An agitator 8 is arranged in the acid-base neutralization reaction tank 7 to ensure that the activated waste alkali liquid and the waste acid liquid are fully mixed and fully reacted. The acid-base neutralization reaction tank 7 is connected to the primary coarse filter tank Ⅰ11 and the primary coarse filter tank Ⅱ19 through a connecting pipe and a delivery pump Ⅲ10. The filter element Ⅲ12 and the filter element Ⅴ20 divide the primary coarse filter tank Ⅰ11 and the primary coarse filter tank Ⅱ19 into a filter chamber and a storage chamber (vacuum chamber). The neutralized liquid in the acid-base neutralization reaction tank 7 is transported to the primary coarse filter tank Ⅰ11 and the primary coarse filter tank Ⅱ19 through a connecting pipe and a delivery pump Ⅲ10. The filter chamber of the filter tank Ⅱ19, the vacuum equipment 22 is connected with the storage chamber (vacuum chamber) of the primary coarse filter tank Ⅰ11 and the primary coarse filter tank Ⅱ19 through the vacuum pipe 21, and the storage chamber (vacuum chamber) of the primary coarse filter tank Ⅰ11 and the primary coarse filter tank Ⅱ19 is set to vacuum through the vacuum equipment 22. The neutralized liquid realizes solid-liquid separation under the pressure difference on the upstream and downstream sides of the filter element Ⅲ12 and the filter element Ⅴ20, and the aluminum hydroxide precipitate remains in the filter chamber of the primary coarse filter tank Ⅰ11 and the primary coarse filter tank Ⅱ19, and the coarse filtrate enters the storage chamber (vacuum chamber) of the primary coarse filter tank Ⅰ11 and the primary coarse filter tank Ⅱ19.

[0042] The filter element IV15 divides the secondary fine filter tank 14 into a filter chamber and a storage chamber. The primary coarse filter tank I11 and the primary coarse filter tank II19 are connected to the secondary fine filter tank 14 through a connecting pipe and a delivery pump IV13. The coarse filtrate is delivered to the secondary fine filter tank 14 through the connecting pipe and the delivery pump IV13. The coarse filtrate is filtered again by the filter element IV15 to completely filter out the aluminum hydroxide precipitate in the activated waste liquid. The fine filtrate enters the storage chamber of the secondary fine filter tank 14. The secondary fine filter tank 14 is connected to the filtrate storage tank 17 through a connecting pipe and a delivery pump V16. The fine filtrate is delivered to the filtrate storage tank 17 for storage through the connecting pipe and the delivery pump V16. The filtrate discharge port 18 is located at the bottom of the filtrate storage tank 17, and the filtrate storage tank 17 discharges the fine filtrate through the filtrate discharge port 18.

[0043] The control panel 9 completes the conveying of the waste alkali solution and the acid-base neutralization solution and controls the rotation of the agitator 8 through control signals, thereby realizing the automated operation of the waste alkali solution treatment.

[0044] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. An automated device for treating waste alkali solution from nickel mesh activation in electrolytic cells, characterized in that: include: A waste acid liquid impurity filtering tank (1) for filtering impurities in the waste acid liquid; A waste alkali liquid impurity filter tank (4) for filtering impurities in the waste alkali liquid; an acid-base neutralization reaction tank (7) connected to the output pipelines of the waste acid impurity filter tank (1) and the waste alkali impurity filter tank (4), respectively; a stirrer (8) is provided in the acid-base neutralization reaction tank (7); A primary coarse filtration tank I (11) and a primary coarse filtration tank II (19) respectively connected to the output pipeline of the acid-base neutralization reaction tank (7); a secondary fine filter tank (14) connected to the output pipelines of the primary coarse filter tank I (11) and the primary coarse filter tank II (19), respectively; a filtrate storage tank (17) connected to an output pipeline of the secondary fine filtration tank (14); A control panel (9) for controlling the delivery of each output pipeline and the stirrer (8).

2. The automated equipment for treating waste alkali solution from nickel mesh activation in electrolytic cells according to claim 1, characterized in that: The waste acid liquid impurity filter tank (1) is provided with a filter element I (2) which divides the waste acid liquid impurity filter tank (1) into a waste acid liquid filtering chamber and a storage chamber; the output pipeline of the waste acid liquid impurity filter tank (1) is provided with a delivery pump I (3); A filter element II (5) is provided in the waste alkali liquid impurity filter tank (4) for dividing the waste alkali liquid impurity filter tank (4) into a waste alkali liquid filtering chamber and a storage chamber; a delivery pump II (6) is provided on the output pipeline of the waste alkali liquid impurity filter tank (4).

3. The automated equipment for treating waste alkali solution from nickel mesh activation in electrolytic cells according to claim 1 or 2, characterized in that: The stirrer (8) is located in the middle of the acid-base neutralization reaction tank (7) and has three blades distributed in the horizontal direction; the stirrer (8) is driven by a stirring motor (23); and a delivery pump III (10) is provided in the output pipeline of the acid-base neutralization reaction tank (7).

4. The automated equipment for treating waste alkali solution from nickel mesh activation in electrolytic cells according to claim 3, characterized in that: A filter element III (12) is provided in the primary coarse filter tank I (11) to divide the primary coarse filter tank into a filter chamber and a storage chamber; A filter element V (20) is provided in the primary coarse filter tank II (19) to divide the primary coarse filter tank into a filter chamber and a storage chamber; The vacuum device (22) is connected to the storage chambers of the primary coarse filter tank I (11) and the primary coarse filter tank II (19) via a vacuum pipeline (21); A delivery pump IV (13) is provided on the output pipelines of the first-stage coarse filter tank I (11) and the first-stage coarse filter tank II (19).

5. The automated equipment for treating waste alkali solution from nickel mesh activation in electrolytic cells according to claim 4, characterized in that: A filter element IV (15) is provided in the secondary fine filter tank (14); and a delivery pump V (16) is provided on the output pipeline of the secondary fine filter tank (14).

6. The automated equipment for treating waste alkali solution from nickel mesh activation in electrolytic cells according to claim 1 or 2, characterized in that: The bottom of the filtrate storage tank (17) is provided with a filtrate discharge port (18).

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