Alkali liquor treatment device

Abstract

The utility model discloses an alkali liquor treatment device, and relates to the technical field of hydrogen production, the alkali liquor treatment device comprises a hydrogen production device and a steam stripping device, the hydrogen production device comprises a gas-liquid separator and a scrubber, the scrubber is connected with the gas-liquid separator and is used for dealkalizing alkali-containing gas conveyed by the gas-liquid separator, and the steam stripping device is used for stripping the alkali-containing gas conveyed by the gas-liquid separator. An alkali-containing liquid is output; the steam stripping device is connected with the scrubber, and the steam stripping device is used for inputting to-be-treated acid gas and the alkali-containing liquid and is used for neutralizing the input to-be-treated acid gas through the alkali-containing liquid to obtain recycled demineralized water. Therefore, the alkali-containing liquid can be effectively treated, cyclic utilization of the alkali-containing liquid is realized, and the treatment cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen production, in particular to a caustic solution treatment device. BACKGROUND

[0002] In the related art, the caustic solution treatment device needs to separate hydrogen and caustic solution. Generally, the hydrogen and caustic solution are separated by a gas-liquid separator. However, the caustic solution containing liquid treated by the caustic solution treatment device cannot be effectively utilized, and the treatment cost of the discharged caustic solution containing liquid is high. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a caustic solution treatment device, which aims to effectively treat and utilize the caustic solution containing liquid.

[0004] To achieve the above-mentioned purpose, the present application provides a caustic solution treatment device, which comprises:

[0005] A hydrogen production device comprising a gas-liquid separator and a scrubber, the scrubber being connected with the gas-liquid separator, used for carrying out caustic removal treatment on the caustic gas containing liquid transmitted by the gas-liquid separator, and outputting caustic solution containing liquid;

[0006] A stripping device connected with the scrubber, the stripping device being used for inputting the caustic solution containing liquid and the acid gas to be treated, and carrying out neutralization treatment on the input acid gas to be treated by the caustic solution containing liquid, and obtaining recovered desalted water.

[0007] In an embodiment, the scrubber comprises a tank body and a filler, the filler being arranged in the tank body, used for dividing an upper space and a lower space in the tank body;

[0008] The scrubber is provided with a first gas inlet and a first liquid outlet, wherein the first gas inlet is arranged in the lower space and used for inputting the caustic gas containing liquid transmitted by the gas-liquid separator; and the first liquid outlet is arranged in the lower space and used for outputting the caustic solution containing liquid.

[0009] In an embodiment, the scrubber is further provided with a first liquid inlet, and the scrubber further comprises a sprayer, the sprayer being arranged in the scrubber corresponding to the position of the upper space, and being connected with the first liquid inlet of the scrubber, used for inputting desalted water into the tank body.

[0010] In an embodiment, the sprayer comprises a plurality of filler layers, and a plurality of sprayers are arranged one by one on the plurality of filler layers.

[0011] In an embodiment, the hydrogen production device further comprises a pressure detection assembly, a first detection end of the pressure detection assembly being connected to the upper space, and a second detection end of the pressure detection assembly being connected to the lower space, for detecting the pressure difference between the upper space and the lower space of the scrubber.

[0012] In an embodiment, the hydrogen production device further comprises a first liquid level detection assembly, the first liquid level detection assembly being connected to the scrubber at a position corresponding to the lower space, for detecting the liquid level in the tank of the scrubber.

[0013] In an embodiment, the scrubber is provided with a first liquid outlet for outputting the alkali-containing liquid, the gas-liquid separator is provided with a second liquid inlet, the first liquid outlet of the scrubber is connected to the second liquid inlet of the gas-liquid separator, for outputting the alkali-containing liquid to the gas-liquid separator.

[0014] In an embodiment, the hydrogen production device further comprises a second liquid level detection assembly, the second liquid level detection assembly being connected to the gas-liquid separator, for detecting the liquid level inside the gas-liquid separator.

[0015] A flow meter is arranged on the connecting pipeline between the first liquid outlet of the scrubber and the second liquid inlet of the gas-liquid separator.

[0016] In an embodiment, the scrubber is provided with a first liquid inlet, the stripping device comprises a stripping tower, the stripping tower is provided with a third liquid outlet, the first liquid inlet of the scrubber is connected to the third liquid outlet of the stripping tower, for inputting the recovered desalted water into the scrubber.

[0017] In an embodiment, a filtering device is arranged on the connecting pipeline between the third liquid outlet of the stripping tower and the first liquid inlet of the scrubber.

[0018] In an embodiment, the stripping tower is provided with a third liquid inlet, the stripping device comprises an alkali washing tower, the alkali washing tower is provided with a liquid inlet end, a gas inlet end and a liquid outlet end, the liquid inlet end of the alkali washing tower is used for inputting the alkali-containing liquid, the gas inlet end of the alkali washing tower is used for inputting the to-be-treated acidic gas, the liquid outlet end of the alkali washing tower is connected to the third liquid inlet of the stripping tower, for outputting the treated alkali-containing liquid to the stripping tower, and obtaining the recovered desalted water through the stripping tower.

[0019] The coupling of the hydrogen production device and the stripping device can expand the application scenarios of the hydrogen production device and the stripping device, so that the alkali-containing liquid discharged in the hydrogen production process can be continuously self-flowing to the gas-liquid separator and effectively utilized.

[0020] By introducing the stripping device, the alkali-containing liquid can efficiently complete the neutralization treatment of the to-be-treated acidic gas of the stripping device and recover the desalted water, thereby realizing the recycling of the alkali-containing liquid.

[0021] The stripping device can realize the neutralization treatment of the acid gas to be treated without adding an alkali injection device, thereby reducing the treatment cost of the alkali-containing liquid, improving the resource utilization capacity through the combined treatment of the hydrogen production device and the stripping device, and providing a new idea for the combined application of new energy devices and traditional chemical devices. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor based on the structures shown in the drawings.

[0023] Figure 1 A schematic diagram of an embodiment of the alkali liquid treatment device of the related art;

[0024] Figure 2 A schematic diagram of an embodiment of the alkali liquid treatment device provided by the present application;

[0025] Figure 3 A schematic diagram of another embodiment of the alkali liquid treatment device provided by the present application;

[0026] Figure 4 A schematic diagram of an embodiment of the hydrogen production device provided by the present application.

[0027] EXPLANATION OF DRAWINGS:

[0028] 11, separator; 12, hydrogen gas scrubber; 13, desalted water input end;

[0029] 100, hydrogen production device; 110, gas-liquid separator; 120, scrubber; 121, tank body; 1211, upper space; 1212, lower space; 122, filler; 1221, filler layer; 123, sprayer;

[0030] 200, stripping device; 210, stripping tower; 220, alkali washing tower; 230, bottom pump; 240, raw material storage device;

[0031] 310, pressure detection assembly; 320, first liquid level detection assembly; 330, flow meter;

[0032] 400, filtering device.

[0033] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0035] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0036] In addition, if the embodiments of the present application involve descriptions such as “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, “and / or” or “and / or” appearing throughout the text means that the three parallel solutions include A solution, or B solution, or A and B solutions are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.

[0037] Under the background of global carbon emission reduction, water electrolysis hydrogen production system as a new energy device is gradually widely used. The water electrolysis hydrogen production system includes an electrolytic tank, a gas-liquid separation system and a purification system, wherein the hydrogen side separation function of the gas-liquid separation system separates hydrogen and alkaline solution from the electrolytic tank to obtain 99.8% (V / V) of crude hydrogen. The hydrogen gas and a small amount of alkaline solution mixed gas-liquid are immersed in water in the hydrogen gas scrubber, and theoretically, a small amount of alkaline solution contained in the hydrogen gas can be removed.

[0038] In addition, in the gas-liquid separation system, a small amount of desalted water is supplemented in the hydrogen gas scrubber as a raw material consumed in the water electrolysis hydrogen production system and also as a scrubber, and the inlet nozzle of the hydrogen gas and a small amount of alkaline solution mixed gas is extended into a certain liquid level, so as to remove the alkaline solution in the hydrogen gas. KOH remains in the scrubbing liquid, and after reaching a certain liquid level, it flows back to the hydrogen gas separator of the gas-liquid separation system through the overflow port.

[0039] Reference Figure 1In the related art, the alkali treatment device needs to separate hydrogen and alkali liquor. Generally, such alkali treatment device includes a separator 11 and a hydrogen scrubber 12, desalted water is input to the bottom of the hydrogen scrubber 12 through a desalted water input end 13, and the alkali-containing gas transmitted by the separator 11 is subjected to alkali removal treatment by the hydrogen scrubber 12. However, the alkali-containing liquid treated by such alkali treatment device cannot be effectively utilized, and the treatment cost of the discharged alkali-containing liquid is high.

[0040] In order to effectively treat and utilize the alkali-containing liquid, with reference to Figures 2 to 4 The alkali treatment device provided by the present application includes a hydrogen production device 100 and a stripping device 200.

[0041] The hydrogen production device 100 includes a gas-liquid separator 110 and a scrubber 120, the scrubber 120 is connected with the gas-liquid separator 110, and is used for subjecting the alkali-containing gas transmitted by the gas-liquid separator 110 to alkali removal treatment and outputting alkali-containing liquid; the stripping device 200 is connected with the scrubber 120, and is used for inputting the to-be-treated acid gas and the alkali-containing liquid, subjecting the input to-be-treated acid gas to neutralization treatment by the alkali-containing liquid, and obtaining recovered desalted water.

[0042] The gas-liquid separator 110 is a device specially used for separating gas and liquid mixture. In the alkali treatment device, it is mainly used for separating hydrogen and alkali-containing liquid (such as KOH solution) generated in the process of producing hydrogen by electrolyzing water. When the gas-liquid mixture enters the separator, due to the action of gravity, the heavier liquid will deposit at the bottom of the separator, and the lighter hydrogen will rise to the top of the separator in the form of bubbles. The gas-liquid separator 110 can utilize the differences in physical properties (such as density, viscosity, and temperature, pressure, and other influencing factors) of gas and liquid, and realize effective separation of the two by specific separation technology (such as gravity separation, centrifugal separation, etc.).

[0043] The scrubber 120 is a device used for purifying or treating gas, which is mainly used for subjecting the alkali-containing gas from the gas-liquid separator 110 to alkali removal treatment. The scrubber 120 is connected with the gas-liquid separator 110, receives the alkali-containing gas transmitted thereby, and subjects the alkali-containing gas to alkali removal treatment by injecting an appropriate amount of scrubbing liquid (such as desalted water). When the alkali-containing gas enters the scrubber 120, it will be in full contact with the scrubbing liquid (such as desalted water), and the alkali-containing gas will be dissolved and transferred to the liquid phase of the desalted water by physical means, so that the alkali-containing gas is subjected to alkali removal treatment by the scrubber 120, and the alkali liquid component and other impurities are removed, thereby improving the purity of the gas.

[0044] The stripping device 200 is used as a system (or device) for processing liquid and gas mixture, which is mainly used to realize the recycling of alkaline-containing liquid and the treatment of acid gas. The stripping device 200 includes, but is not limited to, a stripping tower 210, an alkali washing tower 220, and a raw material storage device 240, which can be a raw material water tank in particular. The raw material storage device 240 is used to receive acid water containing acid gas (containing H2S) to be treated from an upstream device. The raw material storage device 240 is a normal pressure tank. After the H2S-containing acid water enters the raw material storage device 240, the light components (part of the H2S-containing) are generally easy to volatilize to the top of the tank. The alkali washing tower 220 performs acid-base neutralization reaction on H2S through the alkaline-containing liquid from the scrubber 120. The obtained alkaline-containing liquid is pressurized into the stripping tower 210. Because the stripping tower 210 has sufficient external heat and is maintained at a relatively low pressure level, the incoming treatment liquid undergoes chemical reaction and decompression to evaporate H2S, which is discharged through the gas outlet N33 to a sulfur recovery device for treatment. The desalted water at the bottom of the stripping tower 210 is filtered by a filtering device to obtain qualified desalted water (purified water), and the obtained qualified desalted water (purified water) is connected to the first liquid inlet N13 of the scrubber 120, so as to realize the recycling of desalted water. Through appropriate operating conditions (such as temperature, pressure, etc.), the effective recycling and reuse of the alkaline components in the alkaline-containing liquid can be realized, thereby improving the recycling efficiency and reducing the generation of other by-products.

[0045] The hydrogen production device 100 of the new energy device water electrolysis hydrogen production system is coupled with the stripping device 200 of the acid water stripping system of the supporting device of the oil refinery and other application fields, which can significantly expand the application scenarios of the hydrogen production device and the stripping device. At the same time, by introducing the stripping device 200, the alkaline-containing liquid can efficiently complete the neutralization treatment of the acid gas to be treated of the stripping device, and recover desalted water in the process. This improvement not only realizes the recycling of the alkaline-containing liquid. The stripping device 200 does not need to add an alkali injection device to realize the neutralization treatment of the acid gas to be treated, which not only reduces the treatment cost of the alkaline-containing liquid, but also improves the resource utilization ability through the joint treatment of the hydrogen production device and the stripping device, thereby providing a new idea for the joint application of new energy devices and traditional chemical devices.

[0046] Reference Figure 1The related art discloses a caustic solution treatment device. In the related art, hydrogen and caustic solution are separated by a separator 11. However, according to the existing process, on the one hand, the caustic solution cannot be completely washed away in a small amount of desalted water, which may cause the catalyst in the downstream purification system to be "poisoned", and on the other hand, it is found that there is always some KOH remaining below the overflow position of the hydrogen scrubber 12, which cannot be normally circulated back to the hydrogen separator under continuous production conditions, causing a flow "dead zone" of KOH at the bottom of the hydrogen scrubber. This situation may cause KOH to accumulate continuously. Since KOH has strong corrosive properties, the flow "dead zone" is prone to damage the equipment, causing corrosion perforation, increasing the frequency and cost of equipment maintenance, and possibly causing safety problems.

[0047] The flow "dead zone" refers to a phenomenon that, in the scrubber, due to poor fluid flow or design defects, fluid hardly flows or flows very slowly in some areas; the enrichment phenomenon refers to a phenomenon that, in the scrubber, due to some factors (such as flow rate, temperature, pressure, etc.), some components in the KOH solution are enriched in some areas.

[0048] In order to solve the accumulation and corrosion of KOH at the bottom of the hydrogen scrubber, the structure of the scrubber 120 is optimized and designed: referring to Figures 2 to 4 In an embodiment, the scrubber 120 includes a tank body 121 and a filler 122, the filler 122 is arranged in the tank body 121 and is used to divide the tank body 121 into an upper space 1211 and a lower space 1212. The scrubber 120 is provided with a first gas inlet N11 and a first liquid outlet N12.

[0049] The first gas inlet N11 is arranged in the lower space 1212 and is used to input the caustic gas conveyed by the gas-liquid separator 110, specifically, the caustic gas conveyed from the gas outlet N22 of the gas-liquid separator 110; the first liquid outlet N12 is arranged in the lower space 1212 and is used to output the caustic liquid.

[0050] The coupling of the hydrogen production device 100 and the stripping device 200 enables the caustic liquid discharged in the hydrogen production process to flow continuously to the gas-liquid separator 110 and be effectively utilized, thereby eliminating the flow "dead zone" and enrichment phenomenon of KOH that may exist in the scrubber 120. The scrubber 120 is mainly used to further separate the liquid components in the caustic gas conveyed from the gas-liquid separator 110.

[0051] The structure of the scrubber 120 is optimized to achieve complete removal of KOH in the alkali-containing gas. The filler 122 is arranged in the tank body 121 and divides the tank body 121 into an upper space 1211 and a lower space 1212. The first gas inlet N11 and the first liquid outlet N12 are both arranged in the lower space 1212. This countercurrent operation mode allows the alkali-containing gas and the desalted water to flow in opposite directions in the scrubber 120. This structural design significantly increases the contact area of the alkali-containing gas and the desalted water, thereby improving the scrubbing efficiency. In addition, this design also allows the gas and liquid in the tank body 121 to flow and react more orderly, optimizes the liquid flow efficiency, and enhances the stability and safety of the equipment, effectively avoiding equipment failure or performance degradation caused by poor liquid flow or uneven gas distribution. By flexibly adjusting the position and size of the first liquid outlet N12, the output of the alkali-containing liquid can also be accurately controlled. In this way, the overall performance of the scrubber 120 can be effectively optimized, and the purity and quality of the gas can be improved.

[0052] Referring to Figures 2 to 4 In an embodiment, the scrubber 120 is also provided with a first liquid inlet N13. The scrubber 120 further includes a sprayer 123 arranged in the scrubber 120 corresponding to the position of the upper space 1211 and connected to the first liquid inlet N13 of the scrubber 120 for inputting desalted water into the tank body 121.

[0053] The sprayer 123, as a liquid dispersion device, can uniformly spray the input liquid (such as desalted water) in the form of mist or small droplets into the tank body 121 through the nozzles, for increasing the contact area of the liquid and the gas, improving the mixing efficiency of the scrubbing liquid and the alkali-containing gas, and further enhancing the scrubbing effect. Optionally, by improving the design of the sprayer 123, including the size, shape, and distribution position of the nozzles of the sprayer 123, the size of the droplets, the spraying range, and the efficiency of gas-liquid contact can be further controlled to meet the needs of different operating conditions and gas compositions.

[0054] The setting of the first liquid inlet N13 can accurately control the start of input, input amount, input time, and stop of input of the scrubbing liquid such as desalted water. The sprayer 123 connected to the first liquid inlet N13 of the scrubber 120 corresponding to the position of the upper space 1211 can uniformly spray the input desalted water and other scrubbing liquids into the tank body 121, ensuring that the scrubbing liquid can fully cover and contact and react with the alkali-containing gas, improving the scrubbing efficiency, and further optimizing the gas purity and quality. The setting of the sprayer 123 can also help maintain the pressure balance inside the scrubber 120, reduce local pressure differences, thereby optimizing the stability and safety of the equipment operation, reducing equipment wear and corrosion caused by uneven pressure, and prolonging the service life of the equipment.

[0055] Referring toFigure 3 , Figure 4 In one embodiment, the sprayer 123 includes one or more layers of packing material 1221, and the position and number of sprayers 123 correspond to the packing material layers 1221. When the sprayer 123 includes multiple layers of packing material 1221, there are multiple sprayers 123, and multiple sprayers 123 are arranged one-to-one on the multiple layers of packing material 1221. The arrangement of multiple layers of packing material 1221 and corresponding sprayers 123 can increase the gas-liquid contact time and contact area. The one-to-one arrangement of multiple sprayers 123 on the multiple layers of packing material 1221 ensures that the demineralized water is evenly covered on each layer of packing material 1221, avoiding local dryness or over-wetting. In this way, the treatment efficiency of alkaline gases and the uniformity of washing can be effectively improved, and the purification effect can be optimized.

[0056] Reference Figure 3 , Figure 4 In one embodiment, the hydrogen production device 100 further includes a pressure detection component 310. The first detection end L1 of the pressure detection component 310 is connected to the upper space 1211, and the second detection end L2 is connected to the lower space 1212, used to detect the pressure difference between the upper space 1211 and the lower space 1212 of the scrubber 120. Based on the pressure difference between the upper space 1211 and the lower space 1212 of the scrubber 120, the fluid flow capacity and resistance of the packing gland 122 can be determined, indirectly indicating the usage and performance status of the packing gland 122. Specifically, when the packing gland 122 is working normally, the pressure inside the scrubber 120 should remain within a relatively stable range; when the packing gland 122 becomes clogged or worn, the resistance of fluid passing through the packing layer 1221 increases, leading to an increase or fluctuation in the internal pressure of the scrubber 120.

[0057] Reference Figures 2 to 4 In one embodiment, the hydrogen production device 100 further includes a first liquid level detection component 320. The first liquid level detection component 320 is connected to the scrubber 120 at a position corresponding to the lower space 1212, and is used to detect the liquid level inside the scrubber 120. The first liquid level detection component 320 can be a liquid level transmitter or other liquid level detection device, specifically including but not limited to ultrasonic level gauges, radar level gauges, capacitive level sensors, piezoresistive level sensors, and float-type level sensors. The connection of the first liquid level detection component 320 to the scrubber 120 at a position corresponding to the lower space 1212 ensures the accuracy and reliability of liquid level detection, provides direct feedback on the liquid level inside the tank and its changes, and further optimizes operational efficiency and safety.

[0058] The cooperation of the first liquid level detection assembly 320 and the pressure detection assembly 310 can timely find the changes of the pressure and the liquid level, and further realize fault early warning, and eliminate the flow "dead zone" and enrichment phenomenon of KOH in the scrubber 120. The early warning system can be combined with an automatic control system to realize automatic diagnosis and fault elimination, thereby reducing downtime and improving production efficiency.

[0059] With reference to Figures 2 to 4 In an embodiment, the scrubber 120 is provided with a first liquid outlet N12 for outputting the alkali-containing liquid, the gas-liquid separator 110 is provided with a second liquid inlet N21, the first liquid outlet N12 of the scrubber 120 is connected with the second liquid inlet N21 of the gas-liquid separator 110, and the alkali-containing liquid is outputted to the gas-liquid separator 110. The scrubbed alkali-containing liquid outputted by the scrubber 120 enters the stripping device 200 in one way; and enters the gas-liquid separator 110 for liquid supplementing in one way, so as to supplement the consumption of raw water of the water electrolysis hydrogen production system. In this way, the pipeline can be reduced, the utilization of the alkali-containing liquid can be improved, and the repeated treatment or invalid flow of the liquid can be avoided, thereby improving the system operation efficiency.

[0060] With reference to Figures 2 to 4 In an embodiment, the hydrogen production device 100 further comprises a second liquid level detection assembly (not shown in the figure), which is connected with the gas-liquid separator 110 and used for detecting the internal liquid level of the gas-liquid separator 110; and a flow meter 330 is arranged on the connecting pipeline between the first liquid outlet N12 of the scrubber 120 and the second liquid inlet N21 of the gas-liquid separator 110.

[0061] The second liquid level detection assembly can be a liquid level transmitter or other liquid level detection device, and specifically can include but is not limited to an ultrasonic liquid level meter, a radar liquid level meter, a capacitive liquid level sensor, a piezoresistive liquid level sensor, and a float type liquid level sensor. The second liquid level detection assembly is connected with the gas-liquid separator 110 and used for detecting the internal liquid level of the gas-liquid separator 110, and the flow meter 330 is used for detecting the pipeline flow of the connecting pipeline between the first liquid outlet N12 and the second liquid inlet N21. A control valve or other control switch can also be arranged on the connecting pipeline. The second liquid level detection assembly and the flow meter 330 and other detection devices can be combined with an automatic control device and a control switch, and the control device is electrically connected with the second liquid level detection assembly and the flow meter 330, so as to obtain the internal liquid level of the gas-liquid separator 110 and the pipeline flow, and used for opening the pipeline for water supplementing when the internal liquid level of the gas-liquid separator 110 is low (and / or the pipeline flow is large), and for suspending water supplementing when the internal liquid level of the scrubber 120 is low (and / or the pipeline flow is small). In this way, the electrolysis consumption of water can be supplemented in time, and the scrubber liquid level can be maintained, and the automatic control function (flow cascade control) can be realized, thereby improving the production efficiency and reducing the labor cost.

[0062] In an embodiment, the scrubber 120 is provided with a first liquid inlet N13, the stripping device 200 comprises a stripping tower 210 provided with a third liquid outlet N32, and the first liquid inlet N13 of the scrubber 120 is connected to the third liquid outlet N32 of the stripping tower 210, for inputting the recovered desalted water into the scrubber 120. The recovered desalted water after the stripping treatment is directly or through an added desalted water recovery device delivered to the first liquid inlet N13 of the scrubber 120 through a pipeline. This process not only significantly reduces the water consumption, but also reduces the waste water discharge and treatment cost, thereby effectively reducing the production cost and achieving the goal of environmental protection and energy saving.

[0063] Further, a filter device 400 is arranged on the connecting pipeline between the third liquid outlet N32 of the stripping tower 210 and the first liquid inlet N13 of the scrubber 120. The added filter device 400 can effectively remove impurities and particulate matters in the recovered desalted water, preventing them from entering the interior of the scrubber 120 to wear the inner wall and block the nozzle and other components, thereby reducing the frequency of maintenance and replacement and prolonging the service life of the scrubber 120.

[0064] Reference Figures 2 to 4 In an embodiment, the stripping tower 210 is provided with a third liquid inlet N31, and the stripping device 200 comprises a caustic washing tower 220 provided with a liquid inlet end N41, a gas inlet end N42 and a liquid outlet end N43. The liquid inlet end N41 of the caustic washing tower 220 is used for inputting the liquid containing alkali, the gas inlet end N42 of the caustic washing tower 220 is used for inputting the acidic gas to be treated, and the liquid outlet end N43 of the caustic washing tower 220 is connected to the third liquid inlet N31 of the stripping tower 210, for outputting the treated liquid containing alkali to the stripping tower 210 and obtaining the recovered desalted water through the stripping tower 210. The liquid outlet end N43 of the caustic washing tower 220 is connected to the third liquid inlet N31 of the stripping tower 210, and a bottom pump 230 can be arranged on the connecting pipeline between the two, which not only optimizes the recovery process of the desalted water, but also enables the liquid containing alkali to be efficiently and continuously input into the stripping tower 210 for treatment. The stripping tower 210 recovers the desalted water through stripping operation, and inputs the recovered desalted water into the scrubber 120 through the third liquid outlet N32; at the same time, the acidic gas is effectively treated, and the treated acidic gas is discharged through a gas outlet N33 arranged on the stripping tower 210 and further recovered to a sulfur recovery device. The acid-base neutralization reaction reduces the emission of acidic gas, reduces the impact on the environment, and improves the safety of operation.

[0065] The specific working process of the caustic solution treatment device of the present application is as follows:

[0066] The caustic gas (including hydrogen and alkali mist) from the gas-liquid separator 110 (hydrogen separator) is introduced from the first gas inlet N11 of the lower space 1212 of the scrubber 120 (hydrogen scrubber).

[0067] In the inside of the scrubber 120, a high-efficiency filler 122 (including a filler layer 1221) and a spraying device (including a sprayer 123) are designed. The filler 122 is arranged in the tank body 121 and divides the tank body 121 into an upper space 1211 and a lower space 1212. When the filler layer 1221 is arranged in multiple layers, multiple sprayers 123 are arranged on the multiple filler layers 1221 one by one. Each sprayer 123 is arranged in the scrubber 120 corresponding to the position of the upper space 1211 of the scrubber 120 and is connected with the first liquid inlet N13 of the scrubber 120. A large amount of desalted water for washing enters the inside of the scrubber 120 through the spraying device, so that the countercurrent heat and mass transfer is realized in the scrubber 120 to complete the KOH washing. The hydrogen washing effect is further ensured by setting the filler type, segmented filler, high-efficiency spraying, and the amount of desalted water used.

[0068] The stripping device 200 includes, but is not limited to, a stripping tower 210, an alkali washing tower 220, and a raw material storage device 240. The raw material storage device 240 can be a raw material water tank. The raw material storage device 240 is used to receive the acidic water containing the acidic gas (containing H2S) to be treated transmitted by the upstream device. The raw material storage device 240 is a normal-pressure tank. After the acidic water containing H2S enters the raw material storage device 240, the light components (part of the H2S) are generally easy to volatilize to the top of the tank. The alkali washing tower 220 performs acid-base neutralization reaction on H2S through the alkali-containing liquid from the scrubber 120. The obtained alkali-containing liquid is pressurized and enters the stripping tower 210. Because the stripping tower 210 has sufficient external heat and is maintained at a low pressure level, the processing liquid entering the stripping tower 210 will evaporate H2S through chemical reaction and pressure reduction, and then is discharged through the gas outlet N33 to the sulfur recovery device for treatment. The desalted water (purified water) obtained by filtering the desalted water from the bottom of the stripping tower 210 can be qualified, and the qualified desalted water (purified water) is connected to the first liquid inlet N13 of the scrubber 120, so as to realize the recovery of the desalted water, and make the regenerated purified water completely consumed by other systems.

[0069] The scrubber 120 returns part of the rich alkali liquid (alkali-containing liquid) to the gas-liquid separator 110. Specifically, the first liquid outlet N12 of the scrubber 120 is connected to the second liquid inlet N21 of the gas-liquid separator 110, and the alkali-containing liquid is output to the gas-liquid separator 110 to supplement the consumption of raw water of the water electrolysis hydrogen production system. A flow control system is added to the pipeline connected to the first liquid outlet N12 at the bottom of the scrubber 120. Specifically, a second liquid level detection assembly is arranged to be connected to the gas-liquid separator 110 to detect the liquid level inside the gas-liquid separator 110; a flow meter 330 is arranged on the connecting pipeline between the first liquid outlet N12 of the scrubber 120 and the second liquid inlet N21 of the gas-liquid separator 110, and the flow meter 330 is used to detect the pipeline flow on the connecting pipeline between the first liquid outlet N12 and the second liquid inlet N21. The connecting pipeline can also be provided with a control valve or other control switch. The detection devices such as the second liquid level detection assembly and the flow meter 330 can be combined with automatic control devices and control switches, and the control device is electrically connected to the second liquid level detection assembly and the flow meter 330 to obtain the liquid level inside the gas-liquid separator 110 and the pipeline flow, so as to open the pipeline for water replenishment when the liquid level inside the gas-liquid separator 110 is low (and / or the pipeline flow is large); and to suspend water replenishment when the liquid level inside the scrubber 120 is low (and / or the pipeline flow is small). In this way, the water consumed in electrolysis can be replenished in time, the liquid level of the scrubber can be maintained, and automatic control function (flow cascade control) can be realized, thereby improving production efficiency and reducing labor cost.

[0070] Compared with the existing stripping device 200, an additional alkali injection device such as an alkali injection pry device is needed to add alkali-containing liquid. The hydrogen production device 100 and the stripping device 200 are coupled in the present application, which can effectively reduce the cost of equipment investment and site management. Without increasing the equipment, on the one hand, KOH in the alkali-containing gas (alkali-containing hydrogen) is completely removed, and the "dead zone" of KOH flow in the scrubber 120 is eliminated, thereby reducing the probability of equipment corrosion; on the other hand, the stripping device 200 tail gas (acidic gas to be treated) washing process can be optimized, and the equipment investment of the stripping device 200 can be reduced, thereby not only reducing the treatment cost of the alkali-containing liquid, but also improving the resource utilization capacity through the combined treatment of the hydrogen production device and the stripping device, thereby providing a new idea for the combined application of new energy devices and traditional chemical devices.

[0071] The above description is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. An alkaline solution treatment device characterized by comprising: The application relates to a hydrogen production device. The hydrogen production device comprises a gas-liquid separator and a scrubber connected with the gas-liquid separator, wherein the scrubber is used for carrying out alkali removal treatment on alkali-containing gas delivered by the gas-liquid separator and outputting alkali-containing liquid. The scrubber comprises a tank body and a filler arranged in the tank body, which divides the tank body into an upper space and a lower space.

2. The caustic treatment device of claim 1, wherein, The scrubber is provided with a first gas inlet and a first liquid outlet, wherein the first gas inlet is arranged in the lower space and used for inputting the alkali-containing gas delivered by the gas-liquid separator; and the first liquid outlet is arranged in the lower space and used for outputting the alkali-containing liquid. The scrubber is further provided with a first liquid inlet, and the scrubber further comprises a sprayer arranged in the scrubber and connected with the first liquid inlet of the scrubber, which is used for inputting desalted water into the tank body.

3. The caustic treatment device of claim 2, wherein, The sprayer comprises multiple filler layers, and a plurality of sprayers are arranged on the multiple filler layers one by one.

4. The caustic treatment device of claim 3, wherein, The hydrogen production device further comprises a pressure detection assembly, wherein a first detection end of the pressure detection assembly is connected with the upper space, and a second detection end of the pressure detection assembly is connected with the lower space, which is used for detecting the pressure difference between the upper space and the lower space of the scrubber.

5. The caustic treatment device of claim 2, wherein, The hydrogen production device further comprises a first liquid level detection assembly, wherein the first liquid level detection assembly is connected with the scrubber at a position corresponding to the lower space, which is used for detecting the liquid level in the tank of the scrubber.

6. The caustic treatment device of claim 2, wherein, The scrubber is provided with a first liquid outlet used for outputting alkali-containing liquid, and the gas-liquid separator is provided with a second liquid inlet, wherein the first liquid outlet of the scrubber is connected with the second liquid inlet of the gas-liquid separator, which is used for outputting alkali-containing liquid to the gas-liquid separator.

7. The caustic treatment device of claim 1, wherein, The hydrogen production device further comprises a second liquid level detection assembly, wherein the second liquid level detection assembly is connected with the gas-liquid separator, which is used for detecting the internal liquid level of the gas-liquid separator.

8. The caustic treatment device of claim 7, wherein, A flow meter is arranged on the connecting pipeline between the first liquid outlet of the scrubber and the second liquid inlet of the gas-liquid separator. The scrubber is provided with a first liquid inlet, and the stripping device comprises a stripping tower provided with a third liquid outlet, wherein the first liquid inlet of the scrubber is connected with the third liquid outlet of the stripping tower, which is used for inputting recovered desalted water into the scrubber.

9. The caustic treatment apparatus of any one of claims 1-8, wherein, A filter device is arranged on the connecting pipeline between the third liquid outlet of the stripping tower and the first liquid inlet of the scrubber.

10. The caustic treatment device of claim 9, wherein, The stripping tower is provided with a third liquid inlet, and the stripping device comprises an alkali washing tower provided with a liquid inlet end, a gas inlet end and a liquid outlet end, wherein the liquid inlet end of the alkali washing tower is used for inputting alkali-containing liquid, the gas inlet end of the alkali washing tower is used for inputting acid gas to be treated, and the liquid outlet end of the alkali washing tower is connected with the third liquid inlet of the stripping tower, which is used for outputting treated alkali-containing liquid to the stripping tower and obtaining recovered desalted water through the stripping tower.

11. The caustic treatment device of claim 9, wherein, ​

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