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Agricultural nitrogen-containing pollution gas real-time monitoring system and real-time monitoring method

A real-time monitoring system and pollution gas technology, applied in the field of agricultural information, can solve the problems of fast sensitivity decay, high temperature and humidity influence, zero drift, etc., to eliminate the influence of interfering gases, improve sensitivity and accuracy, and prolong service life Effect

Pending Publication Date: 2020-08-14
AGRI INFORMATION INST OF CAS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the agricultural environment is complex, and the high-humidity environment directly affects the accuracy, stability and life of the sensor, which poses a huge challenge to the application of industrial sensors in the agricultural environment.
At present, most of the ammonia sensors are electrochemical sensors. In the agricultural production environment, there are problems such as serious zero drift, great influence of temperature and humidity, too fast sensitivity attenuation, and short service life. It is not suitable for complex agricultural environments.
Semiconductor gas sensors can detect a large concentration of ammonia, but are easily affected by interfering gases and fluctuations in temperature and humidity
Moreover, in the current detection method, the content of a specific gas can only be detected by a specific sensor, and it is impossible to use a sensor to detect the total amount of nitrogen-containing pollutant gas.

Method used

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  • Agricultural nitrogen-containing pollution gas real-time monitoring system and real-time monitoring method

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preparation example Construction

[0059] In the present invention, the obtained second NO 2 The sensor preferably includes a substrate, a heating electrode arranged on the back side of the substrate, a test electrode arranged on the front side of the substrate and a gas-sensitive material layer coated on the front side of the substrate, with a structure such as figure 1 As shown; the substrate is preferably a ceramic substrate; the test electrode is preferably an interdigital electrode; the thickness of the gas-sensitive material layer is preferably 20-40 μm. In the present invention, the second NO 2 The preparation method of the sensor preferably includes the following steps: preparing heating electrodes on the back of the substrate, preparing test electrodes on the front, and then printing the gas-sensitive material on the side of the substrate provided with the interdigitated electrodes by screen printing, and then sintering to obtain Second NO 2 Sensor; the sintering temperature is preferably 500°C, and ...

Embodiment 1

[0078] Using the impregnation method, the HZSM-5 molecular sieve powder is surface-catalyzed with noble metal Pt, thereby preparing the Pt-HZSM5 catalyst. The preparation process is as follows image 3 shown.

[0079] The specific method is:

[0080] (1) Take tetraammine platinum nitrate ([Pt(NH 3 ) 4 ](NO 3 ) 2 , purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.), pour it into 10 mL of deionized water, stir at a constant temperature of 50 ° C for 30 min, and obtain a mother liquor with a concentration of 0.005 mol / L;

[0081] (2) HZSM-5 molecular sieve powder (purchased from Nankai University Catalyst Factory) was dispersed in deionized water to obtain a HZSM-5 molecular sieve solution with a concentration of 0.02g / mL; the prepared mother liquor was dropped into the HZSM-5 molecular sieve solution at a constant speed , controlling the loading of Pt in the final obtained catalyst to be 4wt%, and stirring at room temperature for 4h and then drying at 90°C fo...

Embodiment 2

[0085] Using the mother liquor method, the noble metal Pt is used to modify the surface of the nanostructured alumina powder, thereby preparing Pt-Al 2 o 3 Catalyst, the preparation process such as Image 6 shown.

[0086] Specific steps are as follows:

[0087] (1) Weigh ammonium tetraammine platinum nitrate (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.) according to the required ratio, pour it into a mixed solution of 120 μL water and 100 μL glycerin, and oscillate ultrasonically for 40 minutes until it is completely dissolved. Prepare the mother liquor whose concentration is 0.005mol / L;

[0088] (2) Weigh the required amount of nano-scale Al 2 o 3 (purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.), after fully grinding for ten minutes, it was added to the mother liquor (controlling the loading of Pt in the final obtained catalyst was 4wt%), continued grinding for ten minutes, and placed in the box after taking it out. Sintered at 60...

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Abstract

The invention relates to the technical field of agricultural information, and provides an agricultural nitrogen-containing pollution gas real-time monitoring system and a real-time monitoring method.The system provided by the invention comprises a filter, an enrichment device, a catalytic device, a second test unit, an electromagnetic valve, an air pump, an acquisition card, a relay and a temperature controller, wherein the catalytic device can convert nitrogen-containing pollution gas in the gas into nitrogen dioxide, and the concentration of the nitrogen dioxide is detected through the second test unit, so the concentration of the nitrogen-containing pollution gas generated by agricultural planting activities can be obtained. Furthermore, the system provided by the invention further comprises a first test unit, and the first test unit and the second test unit are combined, so the ammonia gas concentration and the nitrogen dioxide concentration can be obtained as required. When the system provided by the invention is used for monitoring the agricultural nitrogen-containing pollution gas, the total concentration of the nitrogen-containing pollution gas, the ammonia gas concentration and the nitrogen dioxide concentration can be simply, quickly and real-timely monitored without depending on manual operation, and the problems of time and labor consumption and the like of a traditional detection method are solved.

Description

technical field [0001] The invention relates to the field of agricultural information technology, in particular to a real-time monitoring system and real-time monitoring method for agricultural nitrogen-containing pollution gas. Background technique [0002] Human production activities will produce a large amount of nitrogen-containing gas emissions. Inappropriate farming management measures result in about 70% of nitrogen not being fully utilized by crops, but in the form of gaseous nitrogen (nitrogen dioxide, nitrogen monoxide, nitrous oxide, ammonia, etc.) Gas) is released into the environment in the form of nitrous oxide and nitric oxide, and the content is extremely low, so most of the gaseous nitrogen exists in the form of ammonia and nitrogen dioxide. The release of gaseous nitrogen will cause pollution to the ecological environment, which is not conducive to the sustainable development of agriculture. Quantitative detection of gaseous nitrogen emissions in agricultu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/34G01N1/40G01N1/22G01N1/24G01N27/12
CPCG01N1/28G01N1/34G01N1/40G01N1/405G01N1/24G01N1/2294G01N27/127
Inventor 李哲敏李娴花中秋杨博轩吴文斌杨鹏李虎
Owner AGRI INFORMATION INST OF CAS
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