nitrogen flow meter NM3

『nitrogen flow meter NM3|flow meter distributor』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)

1. The conversion pathway of nitrogen oxides: Nitrogen oxides mainly come from nature and human activities. The natural sources mainly come from the oxidation of ammonia in the biosphere, the combustion of biomass, soil emissions, the formation of lightning, and the inflow into the stratosphere. Anthropogenic sources mainly refer to NOx emissions from processes such as fuel combustion, industrial production, and transportation. According to statistics, the amount of NOx generated by natural bacteria worldwide is about 50 × 107 tons per year. The amount of NOx produced by human activities is about 5 × 107 tons per year. From the numbers, it can be seen that the nitrogen oxides produced by human activities are only one tenth of those in nature. Chemical conversion and fate of nitrogen oxides.

1. The main conversion pathway of NO. The main reactions of NO in the atmosphere are as follows: 2NO+O2 → 2NO2 NO+O3 → NO2+O2 NO+HO2 → NO2+OH NO+NO2 → RO+NO2 NO+NO2+H2O → 2HNO2 HNO2+HV → NO+OH

2. The main conversion pathways of NO2. NO2 mainly undergoes the following reactions in the atmosphere: NO2+HV → NO+O NO2+OH+M → HNO3+M NO2+RO2+M → RO2NO2 (PAN) NO2+RO+M → RONO2 NO2 NO2+O3 → NO3+O2 NO2+NO3+M → N2O5+M N2O5+H2O → 2HNO3 NH3+HNO3 → NH4NO3 2NO2+NaCl → NaNO3+NOCl. From the above reactions, it can be seen that the ultimate destination of NOx is the formation of nitric acid and nitrate salts. Large particles of nitrate can directly settle into the surface and ocean, while small particles of nitrate can also settle into the surface and ocean when washed away by rainwater. The methods for treating nitrogen oxide waste gas at home and abroad can generally be divided into two categories: dry method and wet method. The forme

r includes solid adsorption method and catalytic reduction method, while the latter includes liquid absorption method and complex salt generation absorption method. （1） Solid adsorption method. The solid adsorption method for treating NOx exhaust gas can not only completely eliminate pollution, but also recycle NOx. Solid adsorbents include activated carbon, silica gel, and various types of molecular sieves. Its main disadvantages are: cumbersome operation, large amount of molecular sieve used, and high energy consumption. （2） Catalytic reduction method. The principle of catalytic reduction method for treating NO is in the presence of a catalyst Using reducing substances to reduce NO into harmless gases.

1、 Non selective catalytic reduction method. The non selective catalytic reduction method was originally a carrier catalyst using platinum group metals as the main component Remove NOx through heating reaction. This method was used as early as 1956 for decolorizing the exhaust gas of nitric acid factories, which involves using a small amount of reducing agent to reduce the reddish brown NOx in the exhaust gas to colorless NO and release it. It doesnt really remove NOx, its just that you cant see the yellow color.

2、 Ammonia selective catalytic reduction method. This method has more practical advantages, mature technology, and more industrial applications. The catalyst used in this method can be a platinum group or a non platinum group supported catalyst. The reaction temperature is lower than that of non selective catalytic reduction, and the reducing agent nitrogen only reacts with NOx and not with oxygen in the exhaust gas, which can save a large amount of ammonia.

3、 Catalytic reduction method usi

『SILVER Official Website SERVICE』