Electrochemical ammonia synthesis system based on laser absorption spectrum and control method

Abstract

The embodiment of the invention provides an electrochemical ammonia synthesis system based on a laser absorption spectrum and a control method. The system comprises a nitrogen-oxygen mixer, a plasma device, an absorption tower, an alkaline solution tank, a first detection device, a second detection device, a liquid adjusting valve and a gas adjusting valve. According to the detection result of the first detection device and the detection result of the second detection device, the opening degree of the gas adjusting valve is adjusted, so that the proportion of nitrogen to oxygen in the plasma device is achieved, the proportion of the content of NO2 and the content of NO conveyed into the absorption tower is increased, enough NO2 and NO are provided for the absorption tower, and the conversion rate of NOx-ions of the absorption tower is guaranteed. The opening degree of the liquid adjusting valve is adjusted to adjust the amount of the alkaline solution in the absorption tower, so that the conversion rate of NOx-ions of the absorption tower is improved, and the ammonia synthesis efficiency of the electrochemical ammonia synthesis system based on the laser absorption spectrum is further improved.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the field of chemical synthesis technology, and specifically relate to an electrochemical ammonia synthesis system and a control method based on laser absorption spectroscopy. Background Art

[0002] The electrochemical ammonia synthesis system is a system for synthesizing ammonia by electrochemical means, which includes two parts, one part is to convert nitrogen gas into nitrogen-containing anions, and the other part is to convert nitrogen-containing anions into ammonia.

[0003] In the related art, the process of converting nitrogen into nitrogen-containing anions in the electrochemical ammonia synthesis system is difficult to detect, making it difficult to ensure the conversion rate of nitrogen into nitrogen-containing anions in the electrochemical ammonia synthesis system, thereby affecting the overall conversion efficiency of the electrochemical ammonia synthesis system. Summary of the invention

[0004] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide an electrochemical ammonia synthesis system and a control method based on laser absorption spectroscopy.

[0005] The embodiment of the first aspect of the present disclosure provides an electrochemical ammonia synthesis system based on laser absorption spectroscopy, comprising:

[0006] A nitrogen-oxygen mixer, wherein the air-nitrogen mixer is used to mix oxygen and nitrogen;

[0007] A plasma device, wherein the gas outlet of the nitrogen-oxygen mixer is connected to the gas inlet of the plasma device, and the plasma device is used to synthesize NO and NO2;

[0008] An absorption tower, wherein the gas outlet of the plasma device is connected to the absorption tower, the absorption tower contains alkaline absorption liquid, and the exhaust port of the absorption tower is connected to the gas inlet of the plasma device;

[0009] An alkaline solution tank, wherein the liquid inlet of the absorption tower is connected to the liquid discharge port of the alkaline solution tank;

[0010] A first detection device, the first detection device is arranged at the gas outlet end of the plasma device, and the first detection device is used to detect the NO content and NO2 content output by the plasma device;

[0011] A second detection device, the second detection device is arranged at the exhaust port end of the absorption tower, and the second detection device is used to detect the NO content and NO2 content discharged from the absorption tower;

[0012] a liquid regulating valve, the liquid regulating valve being used to regulate the amount of the alkaline solution entering the absorption tower from the alkaline solution tank according to the detection result of the first detection device and the detection result of the second detection device;

[0013] A gas regulating valve, wherein the gas regulating valve is used to regulate the amount of gas from the nitrogen-oxygen mixer entering the plasma device according to the detection result of the first detection device, and / or to regulate the amount of gas from the nitrogen-oxygen mixer entering the plasma device according to the detection result of the second detection device.

[0014] In some embodiments of the present disclosure, the drain port of the absorption tower is connected to the alkaline solution tank.

[0015] In some embodiments of the present disclosure, the first detection device is a tunable semiconductor laser.

[0016] In some embodiments of the present disclosure, the first detection device selects 1599.9 cm -1 The wave number of NO2 spectral line and 1909.13cm -1 Wavenumber of NO line.

[0017] In some embodiments of the present disclosure, the second detection device is a tunable semiconductor laser.

[0018] In some embodiments of the present disclosure, the second detection device selects 1599.9 cm -1 The wave number of NO2 spectral line and 1909.13cm -1 Wavenumber of NO line.

[0019] The second aspect of the present disclosure provides a control method for an electrochemical ammonia synthesis system based on laser absorption spectroscopy, which is used in the control method for an electrochemical ammonia synthesis system based on laser absorption spectroscopy according to any of the above embodiments, and is characterized by comprising the following steps:

[0020] According to the NO / NO2 concentration ratio in the gas output by the plasma device, the gas delivery volume of the nitrogen and oxygen mixer is controlled;

[0021] According to the NO / NO2 concentration ratio in the exhaust gas from the absorption tower, the gas supply volume of the nitrogen and oxygen mixer is controlled;

[0022] The flow rate of the alkaline absorption liquid in the absorption tower is controlled according to the difference between the nitrogen content in the gas output by the plasma device and the nitrogen content in the gas discharged from the absorption tower.

[0023] In some embodiments of the present disclosure, controlling the gas delivery amount of the nitrogen-oxygen mixer according to the NO / NO2 concentration ratio in the gas output by the plasma device specifically includes:

[0024] According to the NO / NO2 concentration ratio in the gas output by the plasma device being greater than the first concentration threshold, the oxygen ratio of the nitrogen and oxygen mixer is controlled to increase.

[0025] In some embodiments of the present disclosure, the gas delivery rate of the nitrogen and oxygen mixer is controlled according to the NO / NO2 concentration ratio in the gas discharged from the absorption tower, specifically including:

[0026] According to the NO / NO2 concentration ratio in the gas discharged from the absorption tower being greater than the second concentration threshold, the oxygen ratio of the nitrogen and oxygen mixer is controlled to increase.

[0027] In some embodiments of the present disclosure, the flow rate of the alkaline absorption liquid of the absorption tower is controlled according to the difference between the nitrogen content in the gas output by the plasma device and the nitrogen content in the gas discharged by the absorption tower, specifically including:

[0028] According to the difference between the nitrogen content in the gas output by the plasma device and the nitrogen content in the gas discharged from the absorption tower being less than the difference threshold, the flow rate of the alkaline absorption liquid in the absorption tower is controlled to increase.

[0029] The electrochemical ammonia synthesis system and control method based on laser absorption spectroscopy of the embodiments of the present disclosure adjust the opening size of the gas regulating valve according to the detection results of the first detection device and the detection results of the second detection device to achieve the ratio of nitrogen to oxygen in the plasma device, thereby increasing the ratio of NO2 content and NO content delivered to the absorption tower, thereby providing sufficient NO2 and NO for the absorption tower and ensuring the conversion rate of NOx- ions in the absorption tower; adjust the opening size of the liquid regulating valve to achieve the adjustment of the amount of alkaline solution in the absorption tower, thereby increasing the conversion rate of NOx- ions in the absorption tower, and further improving the efficiency of synthesizing ammonia in the electrochemical ammonia synthesis system based on laser absorption spectroscopy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of a system for electrochemical ammonia synthesis based on laser absorption spectroscopy according to an embodiment of the present disclosure.

[0031] The reference numerals in the accompanying drawings represent the following:

[0032] 1. Nitrogen-oxygen mixer; 2. Plasma device; 3. Absorption tower; 4. Alkaline solution tank; 5. Second detection device; 6. First detection device. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0034] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of the stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The control method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0035] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0036] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0037] like Figure 1As shown, an embodiment of the first aspect of the present disclosure provides an electrochemical ammonia synthesis system based on laser absorption spectroscopy, comprising: a nitrogen-oxygen mixer 1, a plasma device 2, an absorption tower 3, an alkaline solution tank 4, a first detection device 6, a second detection device 5, a liquid regulating valve and a gas regulating valve, the air-nitrogen mixer is used to mix oxygen and nitrogen, the gas outlet of the nitrogen-oxygen mixer 1 is connected to the gas inlet of the plasma device 2, the plasma device 2 is used to synthesize NO and NO2, the gas outlet of the plasma device 2 is connected to the absorption tower 3, the absorption tower 3 contains alkaline absorption liquid, the exhaust port of the absorption tower 3 is connected to the gas inlet of the plasma device 2, the liquid inlet of the absorption tower 3 is connected to the discharge port of the alkaline solution tank 4, the first detection device 6 is arranged at the gas outlet end of the plasma device 2, the first detection device 6 is used to detect the NO content and NO2 content output by the plasma device 2, the second detection device 5 is arranged at the exhaust port end of the absorption tower 3, the second detection device 5 is used to detect the NO content and NO2 content discharged by the absorption tower 3, the liquid regulating valve is used to adjust the amount of alkaline solution entering the absorption tower 3 from the alkaline solution tank 4 according to the detection results of the first detection device 6 and the detection results of the second detection device 5, the gas regulating valve is used to adjust the amount of gas entering the plasma device 2 from the nitrogen-oxygen mixer 1 according to the detection results of the first detection device 6, and / or to adjust the amount of gas entering the plasma device 2 from the nitrogen-oxygen mixer 1 according to the detection results of the second detection device 5.

[0038] According to the electrochemical ammonia synthesis system based on laser absorption spectroscopy of the embodiment of the present disclosure, the system comprises a nitrogen-oxygen mixer 1, a plasma device 2, an absorption tower 3, an alkaline solution tank 4, a first detection device 6, a second detection device 5, a liquid regulating valve and a gas regulating valve, wherein the nitrogen-oxygen mixer 1 delivers a mixed gas of nitrogen and oxygen to the plasma device 2, the plasma device 2 activates the mixed gas to produce NO and NO2, the NO and NO2 produced by the plasma device 2 are delivered to the absorption tower 3, the alkaline liquid in the absorption tower 3 absorbs NO and NO2 to convert NO and NO2 into NO - and NO2 - , to provide NO for the subsequent ammonia synthesis device - and NO2 - The alkaline solution tank 4 continuously transports the alkaline solution to the absorption tower 3 to provide sufficient alkaline solution for the absorption tower 3 to ensure that the absorption tower 3 converts NO - and NO2 -The first detection device 6 detects the NO content and NO2 content output by the plasma device 2 at the output end of the plasma device 2. The gas regulating valve adjusts the ratio of nitrogen and oxygen delivered by the nitrogen-oxygen mixer 1 to the mixer of the plasma device 2, or the amount of nitrogen and oxygen, according to the NO content and NO2 content detected by the first detection device 6, so that the NO2 content is greater than the NO content, so that the alkaline solution in the absorption tower 3 can convert more nitrogen-containing gas into NOx- ions, improve the conversion rate of the absorption tower 3, provide more NOx- ions for synthetic ammonia, and thus improve the efficiency of synthetic ammonia in the electrochemical synthetic ammonia system based on laser absorption spectroscopy. The second detection device 5 detects the NO content and NO2 content in the gas discharged from the absorption tower 3 at the output end of the absorption tower 3. The gas regulating valve adjusts the ratio of nitrogen and oxygen, or the amount of nitrogen and oxygen in the mixer delivered to the plasma device 2 by the nitrogen-oxygen mixer 1 according to the NO content and NO2 content detected by the second detection device 5, and adjusts the ratio of nitrogen and oxygen and the amount of nitrogen and oxygen delivered to the plasma device 2 by the nitrogen-oxygen mixer 1 to provide sufficient mixed gas for the absorption tower 3 to convert NOx- ions; the liquid regulating valve adjusts the amount of alkaline solution delivered to the absorption tower 3 by the alkaline solution tank 4 according to the NO content and NO2 content in the gas discharged from the absorption tower 3 detected by the second detection device 5, so as to ensure that the amount of alkaline solution in the absorption tower 3 is sufficient, thereby ensuring the conversion rate of the absorption tower 3, providing more NOx- ions for synthetic ammonia, and thereby improving the efficiency of synthetic ammonia in the electrochemical synthetic ammonia system based on laser absorption spectroscopy.

[0039] In this embodiment, according to the detection results of the first detection device 6 and the detection results of the second detection device 5, the opening size of the gas regulating valve is adjusted to achieve the ratio of nitrogen to oxygen in the plasma device 2, thereby increasing the ratio of NO2 content and NO content transported to the absorption tower 3, thereby providing sufficient NO2 and NO for the absorption tower 3 and ensuring the conversion rate of NOx- ions in the absorption tower 3; the opening size of the liquid regulating valve is adjusted to achieve the adjustment of the amount of alkaline solution in the absorption tower 3, thereby increasing the conversion rate of NOx- ions in the absorption tower 3, and further improving the efficiency of synthesizing ammonia in the electrochemical ammonia synthesis system based on laser absorption spectroscopy.

[0040] In some embodiments of the present disclosure, the drain port of the absorption tower 3 is connected to the alkaline solution tank 4, and the drain port of the absorption tower 3 is connected to the alkaline solution tank 4 to transfer the NOx- ions converted in the absorption tower 3 to the alkaline solution tank 4. The alkaline solution tank 4 can be connected to other devices for synthesizing ammonia to transport the NOx- ions in the alkaline solution tank 4 to other devices for synthesizing ammonia, thereby providing NOx- ions for synthesizing ammonia. The alkaline solution tank 4 can also be connected to other alkaline solution supply devices to ensure that there is enough alkaline solution in the alkaline solution tank 4 to supply the absorption tower 3. Specifically, the alkaline solution tank 4 can be divided into two isolated areas, one of which connects the liquid inlet of the absorption tower 3 with the alkaline liquid supply device, and the other connects the liquid outlet of the absorption tower 3 with other devices for synthesizing ammonia.

[0041] In some embodiments of the present disclosure, the first detection device 6 is a tunable semiconductor laser. The second detection device 5 is a tunable semiconductor laser. The tunable semiconductor laser adopts TDLAS technology. The tunable semiconductor lasers commonly used in TDLAS technology include: Fabry-Perot laser, distributed feedback semiconductor laser, distributed Bragg reflector laser, vertical cavity surface-emitting laser and external cavity tuned semiconductor laser.

[0042] In some embodiments of the present disclosure, the first detection device 6 selects 1599.9 cm -1 The wave number of NO2 spectral line and 1909.13cm -1 The second detection device 5 selects 1599.9cm -1 The wave number of NO2 spectral line and 1909.13cm -1 Specifically, the gas discharged from the absorption tower 3 contains water vapor, which has a very wide coverage in the near-infrared to mid-infrared band and is very likely to interfere with the measurement of other components. In order to reduce the influence of water on NO and NO2, the 1599.9 cm -1 The nearby NO2 spectral line and 1909.13cm -1The NO spectrum line nearby is measured. This spectrum line takes into account the extreme water vapor concentration of 15%, and it still has high sensitivity and selectivity for measuring NO2 and NO concentrations as low as 100ppm. The specific measurement technology adopts direct absorption (DA / TD-LAS). The equipment required for direct absorption is simple, the data post-processing is simple, and the cost is low. In view of the extreme situations existing in the actual layout, the wavelength modulation spectroscopy technology (Wavelength Modulation Spectroscopy, WMS / TD-LAS) can be used for measurement. The wavelength modulation spectroscopy technology is not sensitive to low-frequency signal noise. The measurement accuracy is higher in the actual layout due to the size limitation resulting in a shorter laser absorption path and in the industrial environment with large vibration and noise. Its cost and operability are slightly higher than the direct absorption technology.

[0043] The second aspect of the present disclosure provides a control method for an electrochemical ammonia synthesis system based on laser absorption spectroscopy, which is used in the control method for an electrochemical ammonia synthesis system based on laser absorption spectroscopy according to any of the above embodiments, and is characterized by comprising the following steps:

[0044] According to the NO / NO2 concentration ratio in the gas output by the plasma device 2, the gas delivery amount of the nitrogen and oxygen mixer 1 is controlled;

[0045] According to the NO / NO2 concentration ratio in the exhaust gas from the absorption tower 3, the gas delivery rate of the nitrogen and oxygen mixer 1 is controlled;

[0046] The flow rate of the alkaline absorption liquid in the absorption tower 3 is controlled according to the difference between the nitrogen content in the gas output by the plasma device 2 and the nitrogen content in the gas discharged from the absorption tower 3 .

[0047] According to the control method of the electrochemical ammonia synthesis system based on laser absorption spectroscopy in the embodiment of the present disclosure, the first detection device 6 detects the NO content and NO2 content output by the plasma device 2 at the output end of the plasma device 2, and the gas regulating valve adjusts the ratio of nitrogen and oxygen in the mixer delivered by the nitrogen-oxygen mixer 1 to the plasma device 2, or the amount of nitrogen and oxygen, according to the NO content and NO2 content detected by the first detection device 6, so that the NO2 content is greater than the NO content, so that the alkaline solution in the absorption tower 3 can convert more nitrogen-containing gas into NOx- ions, thereby improving the conversion rate of the absorption tower 3, providing more NOx- ions for synthesizing ammonia, and thereby improving the efficiency of synthesizing ammonia in the electrochemical ammonia synthesis system based on laser absorption spectroscopy. The second detection device 5 detects the NO content and NO2 content in the gas discharged from the absorption tower 3 at the output end of the absorption tower 3. The gas regulating valve adjusts the ratio of nitrogen and oxygen, or the amount of nitrogen and oxygen in the mixer delivered to the plasma device 2 by the nitrogen-oxygen mixer 1 according to the NO content and NO2 content detected by the second detection device 5, and adjusts the ratio of nitrogen and oxygen and the amount of nitrogen and oxygen delivered to the plasma device 2 by the nitrogen-oxygen mixer 1 to provide sufficient mixed gas for the absorption tower 3 to convert NOx- ions; the liquid regulating valve adjusts the amount of alkaline solution delivered to the absorption tower 3 by the alkaline solution tank 4 according to the NO content and NO2 content in the gas discharged from the absorption tower 3 detected by the second detection device 5, so as to ensure that the amount of alkaline solution in the absorption tower 3 is sufficient, thereby ensuring the conversion rate of the absorption tower 3, providing more NOx- ions for synthetic ammonia, and thereby improving the efficiency of synthetic ammonia in the electrochemical synthetic ammonia system based on laser absorption spectroscopy.

[0048] In some embodiments of the present disclosure, the gas delivery amount of the nitrogen-oxygen mixer 1 is controlled according to the NO / NO2 concentration ratio in the gas output by the plasma device 2, specifically including:

[0049] According to the NO / NO2 concentration ratio in the gas output by the plasma device 2 being greater than the first concentration threshold, the oxygen ratio of the nitrogen-oxygen mixer 1 is controlled to increase.

[0050] Specifically, the NO / NO2 concentration ratio in the gas output by the plasma device is greater than the first concentration threshold, indicating that the content of NO in the mixed gas of NO and NO2 exceeds the expected value, while the content of NO2 in the mixed gas of NO and NO2 is lower than the expected value, that is, the oxygen content delivered to the plasma device by the nitrogen-oxygen mixer 1 is low, thereby affecting the synthesis amount of NO2, and the low content of NO2 will affect the NOx-ion conversion rate of the absorption tower 3. Therefore, when the NO / NO2 concentration ratio in the gas output by the plasma device 2 is greater than the first concentration threshold, the proportion of oxygen in the nitrogen-oxygen mixer 1 is increased, so that the proportion of oxygen delivered to the plasma device 2 by the nitrogen-oxygen mixer 1 is increased, thereby increasing the amount of NO2 converted by the plasma into the mixed gas, so as to provide sufficient NO2 supply for the absorption tower 3.

[0051] In some embodiments of the present disclosure, the gas delivery rate of the nitrogen-oxygen mixer 1 is controlled according to the NO / NO2 concentration ratio in the gas discharged from the absorption tower 3, specifically including:

[0052] According to the NO / NO2 concentration ratio in the gas discharged from the absorption tower 3 being greater than the second concentration threshold, the oxygen ratio of the nitrogen oxygen mixer 1 is controlled to increase.

[0053] Specifically, the NO / NO2 concentration ratio in the gas discharged from the absorption tower 3 is greater than the second concentration threshold, indicating that the NO content in the mixture of NO and NO2 exceeds the expected value, while the NO2 content in the mixture of NO and NO2 is lower than the expected value, that is, the proportion of oxygen in the mixer delivered by the nitrogen oxygen mixer 1 is reduced. At this time, by increasing the proportion of oxygen in the nitrogen oxygen mixer 1 through the gas regulating valve, the amount of NO2 converted by the plasma device 2 can be increased to provide sufficient NO2 supply for the absorption tower 3.

[0054] In some embodiments of the present disclosure, the flow rate of the alkaline absorption liquid in the absorption tower 3 is controlled according to the difference between the nitrogen content in the gas output by the plasma device 2 and the nitrogen content in the gas discharged by the absorption tower 3, specifically including:

[0055] According to the difference between the nitrogen content in the gas output by the plasma device 2 and the nitrogen content in the gas discharged by the absorption tower 3 being less than the difference threshold, the flow rate of the alkaline absorption liquid in the absorption tower 3 is controlled to increase.

[0056] Specifically, the difference between the nitrogen content in the gas output by the plasma device 2 and the nitrogen content in the gas discharged by the absorption tower 3 is less than the difference threshold, indicating that the ability of the absorption tower 3 to convert NOx- ions is weakened. At this time, the liquid regulating valve is adjusted to increase the flow rate of the alkaline absorption liquid supplied to the absorption tower 3, thereby improving the conversion rate of NOx- ions in the absorption tower 3. The difference between the nitrogen content in the gas output by the plasma device 2 and the nitrogen content in the gas discharged by the absorption tower 3 is less than the difference threshold, specifically including: the difference between the content of NO in the gas output by the plasma device 2 and the content of NO in the gas discharged by the absorption tower 3 is less than the NO difference threshold, or the difference between the content of NO2 in the gas output by the plasma device 2 and the content of NO2 in the gas discharged by the absorption tower 3 is less than the NO2 difference threshold.

[0057] According to the fact that the overall concentration of NO and NO2 in the gas discharged from the absorption tower 3 detected by the second detection device 5 is lower than the concentration threshold, the power of the plasma device 2 is controlled to increase.

[0058] Specifically, the overall concentration of NO and NO2 in the gas discharged from the absorption tower 3 is lower than the concentration threshold, indicating that the working efficiency of the plasma device 2 is reduced. At this time, the power of the plasma device 2 is increased or the plasma device 2 is fine-tuned to achieve the maximum effective output under the same power to improve the conversion capacity of the plasma device 2 to provide sufficient NO and NO2 supply for the absorption tower 3.

[0059] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. An electrochemical ammonia synthesis system based on laser absorption spectroscopy, characterized in that: include: A nitrogen-oxygen mixer, wherein the air-nitrogen mixer is used to mix oxygen and nitrogen; A plasma device, wherein the gas outlet of the nitrogen-oxygen mixer is connected to the gas inlet of the plasma device, and the plasma device is used to synthesize NO and NO2; An absorption tower, wherein the gas outlet of the plasma device is connected to the absorption tower, the absorption tower contains alkaline absorption liquid, and the exhaust port of the absorption tower is connected to the gas inlet of the plasma device; An alkaline solution tank, wherein the liquid inlet of the absorption tower is connected to the liquid discharge port of the alkaline solution tank; A first detection device, the first detection device is arranged at the gas outlet end of the plasma device, and the first detection device is used to detect the NO content and NO2 content output by the plasma device; A second detection device, the second detection device is arranged at the exhaust port end of the absorption tower, and the second detection device is used to detect the NO content and NO2 content discharged from the absorption tower; a liquid regulating valve, the liquid regulating valve being used to regulate the amount of the alkaline solution entering the absorption tower from the alkaline solution tank according to the detection result of the first detection device and the detection result of the second detection device; A gas regulating valve, wherein the gas regulating valve is used to regulate the amount of gas from the nitrogen-oxygen mixer entering the plasma device according to the detection result of the first detection device, and / or to regulate the amount of gas from the nitrogen-oxygen mixer entering the plasma device according to the detection result of the second detection device.

2. The electrochemical ammonia synthesis system based on laser absorption spectroscopy according to claim 1, characterized in that: The liquid discharge port of the absorption tower is communicated with the alkaline solution tank.

3. The electrochemical ammonia synthesis system based on laser absorption spectroscopy according to claim 1, characterized in that: The first detection device is a tunable semiconductor laser.

4. The electrochemical ammonia synthesis system based on laser absorption spectroscopy according to claim 3, characterized in that: The first detection device selects 1599.9cm -1 The wave number of NO2 spectral line and 1909.13cm -1 Wavenumber of NO line.

5. The electrochemical ammonia synthesis system based on laser absorption spectroscopy according to claim 1, characterized in that: The second detection device is a tunable semiconductor laser.

6. The electrochemical ammonia synthesis system based on laser absorption spectroscopy according to claim 5, characterized in that: The second detection device selects 1599.9cm -1 The wave number of NO2 spectral line and 1909.13cm -1 Wavenumber of NO line.

7. A control method for an electrochemical ammonia synthesis system based on laser absorption spectroscopy, used for the control method for an electrochemical ammonia synthesis system based on laser absorption spectroscopy according to any one of claims 1 to 6, characterized in that: The following steps are involved: According to the NO / NO2 concentration ratio in the gas output by the plasma device, the gas supply volume of the nitrogen and oxygen mixer is controlled; According to the NO / NO2 concentration ratio in the exhaust gas from the absorption tower, the gas supply volume of the nitrogen and oxygen mixer is controlled; The flow rate of the alkaline absorption liquid in the absorption tower is controlled according to the difference between the nitrogen content in the gas output by the plasma device and the nitrogen content in the gas discharged from the absorption tower.

8. The control method of the electrochemical ammonia synthesis system based on laser absorption spectroscopy according to claim 7, characterized in that: The method of controlling the gas delivery amount of the nitrogen-oxygen mixer according to the NO / NO2 concentration ratio in the gas output by the plasma device specifically includes: According to the NO / NO2 concentration ratio in the gas output by the plasma device being greater than the first concentration threshold, the oxygen ratio of the nitrogen and oxygen mixer is controlled to increase.

9. The control method of the electrochemical ammonia synthesis system based on laser absorption spectroscopy according to claim 7, characterized in that: According to the NO / NO2 concentration ratio in the gas discharged from the absorption tower, the gas delivery volume of the nitrogen and oxygen mixer is controlled, including: According to the NO / NO2 concentration ratio in the gas discharged from the absorption tower being greater than the second concentration threshold, the oxygen ratio of the nitrogen and oxygen mixer is controlled to increase.

10. The control method of the electrochemical ammonia synthesis system based on laser absorption spectroscopy according to claim 7, characterized in that: The method of controlling the flow rate of the alkaline absorption liquid of the absorption tower according to the difference between the nitrogen content in the gas output by the plasma device and the nitrogen content in the gas discharged by the absorption tower specifically includes: According to the difference between the nitrogen content in the gas output by the plasma device and the nitrogen content in the gas discharged from the absorption tower being less than the difference threshold, the flow rate of the alkaline absorption liquid in the absorption tower is controlled to increase.

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