A detection system and method for nitrogen-containing gas in a fermentation environment

Abstract

The application relates to the technical field of gas detection, in particular to a nitrogen-containing gas detection system and method under a fermentation environment. The system can extract nitrogen-containing gas under the fermentation environment through the setting of a gas sampling device; the content of hydrogen cyanide and nitric oxide in the nitrogen-containing gas can be detected through the setting of a first gas detection device; ammonia in the nitrogen-containing gas is catalytically oxidized into nitrogen dioxide through the setting of a catalytic oxidation device, so that the content of ammonia in the nitrogen-containing gas is determined based on the detection values of a first oxygen sensor and a second oxygen sensor and the oxygen concentration of an oxygen source; water in the exhaust gas of the catalytic oxidation device can be removed through the setting of a water removal device; the content of nitrogen dioxide in the exhaust gas of the catalytic oxidation device can be detected through the setting of a second gas detection device, so that the content of nitrogen dioxide in the nitrogen-containing gas is determined based on the content and the content of ammonia in the nitrogen-containing gas. Therefore, the technical scheme can realize the detection of nitrogen-containing gas under the fermentation environment.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, and in particular to a detection system and method for nitrogen-containing gases in a fermentation environment. Background Technology

[0002] Fermentation, one of the earliest biochemical reactions humans encountered, is now widely used in the food, biological, and chemical industries. However, fermentation is a complex process, often accompanied by changes in microorganisms, temperature, humidity, and gases. Most fermentation processes involve the production of gases, with nitrogen-containing gases making up a significant portion.

[0003] Due to the specific nature of fermentation processes, most fermentations require maintaining high humidity and suitable temperatures. However, some nitrogen-containing gases (such as ammonia and nitrogen dioxide) are readily soluble in water, making their measurement difficult.

[0004] Therefore, there is an urgent need for a detection system and method for nitrogen-containing gases in a fermentation environment to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides a detection system and method for nitrogen-containing gases in a fermentation environment, which can realize the detection of nitrogen-containing gases in a fermentation environment.

[0006] In a first aspect, embodiments of the present invention provide a detection system for nitrogen-containing gases in a fermentation environment, comprising:

[0007] A gas sampling device is used to extract nitrogen-containing gases in a fermentation environment, the nitrogen-containing gases including hydrogen cyanide, nitric oxide, nitrogen dioxide and ammonia, and the gas sampling device is equipped with a first oxygen sensor;

[0008] A first gas detection device is connected to the gas sampling device and is used to detect the content of hydrogen cyanide and nitric oxide in the nitrogen-containing gas.

[0009] A catalytic oxidation device is connected to the gas sampling device. The inlet of the catalytic oxidation device is also connected to an oxygen source. The catalytic oxidation device is used to catalytically oxidize ammonia in the nitrogen-containing gas into nitrogen dioxide. The outlet of the catalytic oxidation device is equipped with a second oxygen sensor. The content of ammonia in the nitrogen-containing gas is determined based on the detection readings of the first oxygen sensor, the second oxygen sensor, and the oxygen concentration of the oxygen source.

[0010] A water removal device, connected to the catalytic oxidation device, is used to remove water from the gas discharged from the catalytic oxidation device;

[0011] A second gas detection device, connected to the water removal device, is used to detect the nitrogen dioxide content in the gas discharged from the catalytic oxidation device, so as to determine the nitrogen dioxide content in the nitrogen-containing gas based on the nitrogen dioxide content and the ammonia content in the nitrogen-containing gas.

[0012] Secondly, embodiments of the present invention provide a method for detecting nitrogen-containing gases in a fermentation environment. Based on the system described in the above embodiments, the method includes:

[0013] The gas sampling device is used to extract nitrogen-containing gases under fermentation conditions;

[0014] The content of hydrogen cyanide and nitric oxide in the nitrogen-containing gas is detected using the first gas detection device;

[0015] The ammonia in the nitrogen-containing gas is catalytically oxidized to nitrogen dioxide using the catalytic oxidation device, and the ammonia content in the nitrogen-containing gas is determined based on the detection readings of the first oxygen sensor and the second oxygen sensor and the oxygen concentration of the oxygen source.

[0016] The water removal device is used to remove water from the gas discharged from the catalytic oxidation device;

[0017] The content of nitrogen dioxide in the gas discharged from the catalytic oxidation device is detected by the second gas detection device, and the content of nitrogen dioxide in the nitrogen-containing gas is determined based on the content of nitrogen dioxide and the content of ammonia in the nitrogen-containing gas.

[0018] As can be seen from the above solutions, the nitrogen-containing gas detection system and method provided by the present invention can extract nitrogen-containing gases in the fermentation environment by setting up a gas sampling device; detect the content of hydrogen cyanide and nitric oxide in the nitrogen-containing gas by setting up a first gas detection device; catalytically oxidize ammonia in the nitrogen-containing gas to nitrogen dioxide by setting up a catalytic oxidation device, and determine the content of ammonia in the nitrogen-containing gas based on the detection readings of the first oxygen sensor and the second oxygen sensor and the oxygen concentration of the oxygen source; remove water from the gas discharged from the catalytic oxidation device by setting up a water removal device; and detect the content of nitrogen dioxide in the gas discharged from the catalytic oxidation device by setting up a second gas detection device, and determine the content of nitrogen dioxide in the nitrogen-containing gas based on this content and the content of ammonia in the nitrogen-containing gas. Therefore, the above technical solution can realize the detection of nitrogen-containing gases in the fermentation environment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a nitrogen-containing gas detection system in a fermentation environment provided in an embodiment of the present invention.

[0021] Figure label:

[0022] 1-Gas sampling device;

[0023] 11-First intake pipe;

[0024] 12 - Air pump;

[0025] 13-Gas flow meter;

[0026] 14 - First oxygen sensor;

[0027] 2-First gas detection device;

[0028] 21-Second intake pipe;

[0029] 22-Hydrogen cyanide sensor;

[0030] 23-Nitric oxide sensor;

[0031] 3-Catalytic oxidation unit;

[0032] 31 - Oxygen source;

[0033] 32-Columnar porous media;

[0034] 33 - Heater;

[0035] 4-Water removal device;

[0036] 41-Color-changing silicone;

[0037] 5-Second gas detection device;

[0038] 51-Diverter flange;

[0039] 52-Nitrogen dioxide sensor;

[0040] 6-Three-way valve;

[0041] 7-Exhaust gas absorption device;

[0042] 8-Cooling device;

[0043] 81 - Second oxygen sensor. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Please see Figure 1 This invention provides a detection system for nitrogen-containing gases in a fermentation environment. The system includes a gas sampling device 1, a first gas detection device 2, a catalytic oxidation device 3, a water removal device 4, and a second gas detection device 5, wherein:

[0046] The gas sampling device 1 is used to extract nitrogen-containing gases in the fermentation environment. The nitrogen-containing gases include hydrogen cyanide, nitric oxide, nitrogen dioxide and ammonia. The gas sampling device 1 is equipped with a first oxygen sensor 14.

[0047] The first gas detection device 2 is connected to the gas sampling device 1 and is used to detect the content of hydrogen cyanide and nitric oxide in nitrogen-containing gas;

[0048] The catalytic oxidation device 3 is connected to the gas sampling device 1. The inlet of the catalytic oxidation device 3 is also connected to an oxygen source 31. The catalytic oxidation device 3 is used to catalytically oxidize ammonia in nitrogen-containing gas into nitrogen dioxide. The outlet of the catalytic oxidation device 3 is equipped with a second oxygen sensor 81. The content of ammonia in nitrogen-containing gas is determined based on the detection readings of the first oxygen sensor 14, the second oxygen sensor 81 and the oxygen concentration of the oxygen source 31.

[0049] The water removal device 4 is connected to the catalytic oxidation device 3 and is used to remove water from the gas discharged from the catalytic oxidation device 3.

[0050] The second gas detection device 5 is connected to the water removal device 4 and is used to detect the nitrogen dioxide content in the gas discharged from the catalytic oxidation device 3, so as to determine the nitrogen dioxide content in the nitrogen-containing gas based on the content and the ammonia content in the nitrogen-containing gas.

[0051] In this embodiment, by setting up a gas sampling device 1, nitrogen-containing gas in the fermentation environment can be extracted; by setting up a first gas detection device 2, the content of hydrogen cyanide and nitric oxide in the nitrogen-containing gas can be detected; by setting up a catalytic oxidation device 3, ammonia in the nitrogen-containing gas is catalytically oxidized to nitrogen dioxide, and the content of ammonia in the nitrogen-containing gas is determined based on the detection readings of the first oxygen sensor 14 and the second oxygen sensor 81 and the oxygen concentration of the oxygen source 31; by setting up a water removal device 4, water in the gas discharged from the catalytic oxidation device 3 can be removed; by setting up a second gas detection device 5, the content of nitrogen dioxide in the gas discharged from the catalytic oxidation device 3 can be detected, and the content of nitrogen dioxide in the nitrogen-containing gas is determined based on this content and the content of ammonia in the nitrogen-containing gas. Therefore, the above technical solution can realize the detection of nitrogen-containing gas in the fermentation environment.

[0052] It should be noted that, based on the law of conservation of elements, the ammonia content in the nitrogen-containing gas can be determined after obtaining the detection readings of the first oxygen sensor 14 and the second oxygen sensor 81, and the oxygen concentration of the oxygen source 31. Since the nitrogen dioxide in the exhaust gas of the catalytic oxidation device 3 includes not only the nitrogen dioxide in the gas to be tested, but also the nitrogen dioxide produced by the reaction of ammonia, the nitrogen dioxide content in the nitrogen-containing gas can also be determined based on the law of conservation of elements, after obtaining the nitrogen dioxide content in the exhaust gas of the catalytic oxidation device 3 and the ammonia content in the nitrogen-containing gas.

[0053] In some embodiments, the catalytic oxidation device 3 may be made of a high-temperature resistant material.

[0054] In one embodiment of the present invention, a three-way valve 6 is provided between the gas sampling device 1, the first gas detection device 2 and the catalytic oxidation device 3;

[0055] When detecting the content of hydrogen cyanide and nitric oxide in nitrogen-containing gas, the valve between gas sampling device 1 and first gas detection device 2 is opened, and the valve between gas sampling device 1 and catalytic oxidation device 3 is closed.

[0056] When detecting the content of nitrogen dioxide and ammonia in nitrogen-containing gas, the valve between gas sampling device 1 and first gas detection device 2 is closed, and the valve between gas sampling device 1 and catalytic oxidation device 3 is opened.

[0057] In this embodiment, a three-way valve 6 is provided between the gas sampling device 1, the first gas detection device 2 and the catalytic oxidation device 3, which facilitates the measurement of each nitrogen-containing gas.

[0058] In one embodiment of the present invention, the system further includes an exhaust gas absorption device 7, which is connected to the first gas detection device 2 and the second gas detection device 5 respectively, and is used to absorb the nitrogen-containing gas discharged by the first gas detection device 2 and the second gas detection device 5.

[0059] In this embodiment, by setting up the exhaust gas absorption device 7, the nitrogen-containing gas discharged by the first gas detection device 2 and the second gas detection device 5 can be absorbed to protect the environment.

[0060] In some embodiments, the exhaust gas absorption device 7 may use a sodium hydroxide solution.

[0061] In one embodiment of the present invention, the gas sampling device 1 includes a first air inlet pipe 11 and a pump 12, a gas flow meter 13 and a first oxygen sensor 14 disposed in the first air inlet pipe 11. The reading of the gas flow meter 13 is equal to the flow rate of the oxygen source 31.

[0062] In this embodiment, the gas to be tested is introduced through the first air inlet pipe 11, so that the gas to be tested enters the device evenly, which can effectively reduce errors and avoid the influence of gas flow on the test results.

[0063] In some embodiments, a dust removal device (not shown in the figure) may be connected to the outside of the first air inlet pipe 11 to ensure that the gas to be tested entering the device is dust-free.

[0064] In some embodiments, the reading of the gas flow meter 13 and the flow rate of the oxygen source 31 can be 1 m³ / s. 3 / min, which ensures that there is an excess of oxygen to react with ammonia.

[0065] In one embodiment of the present invention, the first gas detection device 2 includes a second inlet pipe 21 and a hydrogen cyanide sensor 22 and a nitric oxide sensor 23 disposed in the second inlet pipe 21.

[0066] In one embodiment of the present invention, the catalytic oxidation device 3 includes a columnar porous medium 32 loaded with a catalyst and a heater 33 disposed outside the columnar porous medium 32. The catalyst includes at least one of platinum and rhodium, and the heating temperature of the heater 33 is 650-700°C.

[0067] In some embodiments, the columnar porous medium 32 may be made of molecular sieves or activated carbon.

[0068] In some embodiments, heater 33 can be heated by water or by a heating element.

[0069] In one embodiment of the present invention, the system further includes a cooling device 8, which is disposed between the catalytic oxidation device 3 and the dehydration device 4. The cooling device 8 is used to reduce the temperature of the gas discharged from the catalytic oxidation device 3 to a target temperature of 83-100°C. A second oxygen sensor 81 is disposed at the tail end of the cooling device 8.

[0070] In this embodiment, after the temperature of the gas discharged from the catalytic oxidation device 3 is reduced to the target temperature, the original moisture in the gas to be tested and the moisture generated after the reaction of ammonia can be absorbed. At the target temperature, nitrogen dioxide and water are less likely to generate nitric acid, which helps to accurately measure nitrogen dioxide in the future.

[0071] In some embodiments, the cooling device 8 may employ water cooling or air cooling.

[0072] In some embodiments, the cooling device 8 may be made of a high-temperature resistant material.

[0073] In one embodiment of the present invention, the outlet of the cooling device 8 is connected to the bottom of the dewatering device 4, which is filled with color-changing silica gel 41. This arrangement can guide operators on whether the dewatering device 4 needs to be replaced with the color-changing silica gel 41, thereby further ensuring accurate measurement of nitrogen dioxide in the future.

[0074] In one embodiment of the present invention, the second gas detection device 5 is provided with a flow-diverting interface flange 51 and a plurality of nitrogen dioxide sensors 52, each of which is connected to the flow-diverting interface flange 51.

[0075] In this embodiment, by setting the flow-diverting interface flange 51, the gas can be uniformly introduced into each nitrogen dioxide sensor 52; by setting multiple nitrogen dioxide sensors 52, the detection readings of multiple nitrogen dioxide sensors 52 can be averaged, thereby obtaining a more accurate nitrogen dioxide content.

[0076] Furthermore, embodiments of the present invention also provide a method for detecting nitrogen-containing gases in a fermentation environment, based on the system mentioned in any of the above embodiments, the method comprising:

[0077] Nitrogen-containing gases in the fermentation environment are extracted using gas sampling device 1;

[0078] The content of hydrogen cyanide and nitric oxide in nitrogen-containing gas is detected using the first gas detection device 2;

[0079] The ammonia in the nitrogen-containing gas is catalytically oxidized to nitrogen dioxide using the catalytic oxidation device 3, and the ammonia content in the nitrogen-containing gas is determined based on the detection readings of the first oxygen sensor 14 and the second oxygen sensor 81 and the oxygen concentration of the oxygen source 31.

[0080] Water is removed from the gas discharged from the catalytic oxidation unit 3 using a water removal device 4.

[0081] The content of nitrogen dioxide in the gas discharged from the catalytic oxidation device 3 is detected by the second gas detection device 5, and the content of nitrogen dioxide in the nitrogen-containing gas is determined based on this content and the content of ammonia in the nitrogen-containing gas.

[0082] It should be noted that this method and the nitrogen gas detection system in the fermentation environment in the above embodiments are based on the same inventive concept, and therefore have the same beneficial effects. The beneficial effects of the method will not be elaborated here.

[0083] It should be noted that, in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0084] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A detection system for nitrogen-containing gases in a fermentation environment, characterized in that, include: A gas sampling device (1) is used to extract nitrogen-containing gases in a fermentation environment. The nitrogen-containing gases include hydrogen cyanide, nitric oxide, nitrogen dioxide and ammonia. The gas sampling device (1) is equipped with a first oxygen sensor (14). The first gas detection device (2) is connected to the gas sampling device (1) and is used to detect the content of hydrogen cyanide and nitric oxide in the nitrogen-containing gas; A catalytic oxidation device (3) is connected to the gas sampling device (1). The inlet of the catalytic oxidation device (3) is also connected to an oxygen source (31) to ensure that there is an excess of oxygen to react with ammonia. The catalytic oxidation device (3) is used to catalytically oxidize ammonia in the nitrogen-containing gas into nitrogen dioxide. A second oxygen sensor (81) is provided at the outlet of the catalytic oxidation device (3). The content of ammonia in the nitrogen-containing gas is determined based on the detection readings of the first oxygen sensor (14), the second oxygen sensor (81) and the oxygen concentration of the oxygen source (31). A water removal device (4) is connected to the catalytic oxidation device (3) and is used to remove water from the gas discharged from the catalytic oxidation device (3); The second gas detection device (5) is connected to the water removal device (4) and is used to detect the content of nitrogen dioxide in the gas discharged from the catalytic oxidation device (3) so as to determine the content of nitrogen dioxide in the nitrogen-containing gas based on the content of nitrogen dioxide and the content of ammonia in the nitrogen-containing gas. A three-way valve (6) is provided between the gas sampling device (1), the first gas detection device (2) and the catalytic oxidation device (3). When detecting the content of hydrogen cyanide and nitric oxide in the nitrogen-containing gas, the valve between the gas sampling device (1) and the first gas detection device (2) is opened, and the valve between the gas sampling device (1) and the catalytic oxidation device (3) is closed; When detecting the content of nitrogen dioxide and ammonia in the nitrogen-containing gas, the valve between the gas sampling device (1) and the first gas detection device (2) is closed, and the valve between the gas sampling device (1) and the catalytic oxidation device (3) is opened; The gas sampling device (1) includes a first air inlet pipe (11), a pump (12), a gas flow meter (13), and a first oxygen sensor (14) disposed in the first air inlet pipe (11). The reading of the gas flow meter (13) is equal to the flow rate of the oxygen source (31). The first gas detection device (2) includes a second inlet pipe (21) and a hydrogen cyanide sensor (22) and a nitric oxide sensor (23) disposed in the second inlet pipe (21). The catalytic oxidation device (3) includes a columnar porous medium (32) loaded with a catalyst and a heater (33) disposed outside the columnar porous medium (32). The catalyst includes at least one of platinum and rhodium, and the heating temperature of the heater (33) is 650~700°C. It also includes a cooling device (8), which is located between the catalytic oxidation device (3) and the dehydration device (4). The cooling device (8) is used to reduce the temperature of the gas discharged from the catalytic oxidation device (3) to a target temperature of 83~100℃, so as to absorb the original moisture in the gas to be tested and the moisture generated after the reaction of ammonia. The second oxygen sensor (81) is located at the tail of the cooling device (8). The outlet of the cooling device (8) is connected to the bottom of the dewatering device (4), which is filled with color-changing silica gel (41).

2. The system according to claim 1, characterized in that, It also includes an exhaust gas absorption device (7), which is connected to the first gas detection device (2) and the second gas detection device (5) respectively, and is used to absorb the nitrogen-containing gas discharged by the first gas detection device (2) and the second gas detection device (5).

3. The system according to claim 1, characterized in that, The second gas detection device (5) is provided with a flow-diverting interface flange (51) and a plurality of nitrogen dioxide sensors (52), each of the nitrogen dioxide sensors (52) being connected to the flow-diverting interface flange (51).

4. A method for detecting nitrogen-containing gas in a fermentation environment, characterized in that, Based on the system according to any one of claims 1-3, the method comprises: The gas sampling device (1) is used to extract nitrogen-containing gas in the fermentation environment; The content of hydrogen cyanide and nitric oxide in the nitrogen-containing gas is detected using the first gas detection device (2); The ammonia in the nitrogen-containing gas is catalytically oxidized to nitrogen dioxide using the catalytic oxidation device (3), and the ammonia content in the nitrogen-containing gas is determined based on the detection readings of the first oxygen sensor (14), the second oxygen sensor (81) and the oxygen concentration of the oxygen source (31). The water removal device (4) is used to remove water from the gas discharged from the catalytic oxidation device (3); The content of nitrogen dioxide in the gas discharged from the catalytic oxidation device (3) is detected by the second gas detection device (5), and the content of nitrogen dioxide in the nitrogen-containing gas is determined based on the content of nitrogen dioxide and the content of ammonia in the nitrogen-containing gas.

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