GRVNES Environmental Protection

VOC governance

With the continuous advancement of VOCs pollution prevention, online monitoring of atmospheric VOCs has become an important means of pollution source management, and cities such as Shanghai, Tianjin, and Shenzhen have explicitly requested online monitoring. However, the monitoring and management of VOCs is extremely challenging and even a problem internationally. At present, the monitoring products and monitoring methods on the market are varied and mixed.

Selective Catalytic Reduction (SCR) controls the NOx in diesel exhaust, using NH3 or urea (usually using a 32.5% urea aqueous solution) as a reducing substance, and the O2 concentration is higher than the NOx concentration by more than two orders of magnitude. Under certain temperature and catalyst, NOx is reduced to N2 and H2O by NH3. Since NH3 selectively reduces NOx preferentially without first reacting with O2, it is called "selective catalytic reduction".
For the excess NH3, a certain proportion of ammonia slip catalyst (ASC) is coated on the end of the SCR carrier to ensure that NH3 reacts with O2 to form N2 and H2O, so as to avoid secondary pollution caused by NH3 leakage.
The exhaust temperature of the diesel engine or the gas engine is generally in the range of 300 ° C to 500 ° C, which satisfies the temperature conditions required for the medium temperature catalytic reaction. If the exhaust temperature after the vortex is higher than 500 ° C, the high temperature catalyst should be considered, and the system cost will have a certain proportion. Rise.

The flue gas denitration technology mainly includes dry method (selective catalytic reduction flue gas denitration, selective non-catalytic reduction denitration) and wet method. Compared with wet flue gas denitration technology, the main advantages of dry flue gas denitration technology are: low basic investment, simple equipment and process, high efficiency in removing NOX, no waste water and waste treatment, not easy to cause two Secondary pollution.

Selective Catalytic Reduction (SCR) controls the NOx in diesel exhaust, using NH3 or urea (usually using a 32.5% urea aqueous solution) as a reducing substance, and the O2 concentration is higher than the NOx concentration by more than two orders of magnitude. Under certain temperature and catalyst, NOx is reduced to N2 and H2O by NH3. Since NH3 selectively reduces NOx preferentially without first reacting with O2, it is called "selective catalytic reduction".
For the excess NH3, a certain proportion of ammonia slip catalyst (ASC) is coated on the end of the SCR carrier to ensure that NH3 reacts with O2 to form N2 and H2O, so as to avoid secondary pollution caused by NH3 leakage.
The exhaust temperature of the diesel engine or the gas engine is generally in the range of 300 ° C to 500 ° C, which satisfies the temperature conditions required for the medium temperature catalytic reaction. If the exhaust temperature after the vortex is higher than 500 ° C, the high temperature catalyst should be considered, and the system cost will have a certain proportion. Rise.

Selective Catalytic Reduction (SCR) controls the NOx in diesel exhaust, using NH3 or urea (usually using a 32.5% urea aqueous solution) as a reducing substance, and the O2 concentration is higher than the NOx concentration by more than two orders of magnitude. Under certain temperature and catalyst, NOx is reduced to N2 and H2O by NH3. Since NH3 selectively reduces NOx preferentially without first reacting with O2, it is called "selective catalytic reduction".
       For the excess NH3, a certain proportion of ammonia slip catalyst (ASC) is coated on the end of the SCR carrier to ensure that NH3 reacts with O2 to form N2 and H2O, so as to avoid secondary pollution caused by NH3 leakage.
       The exhaust temperature of the diesel engine or the gas engine is generally in the range of 300 ° C to 500 ° C, which satisfies the temperature conditions required for the medium temperature catalytic reaction. If the exhaust temperature after the vortex is higher than 500 ° C, the high temperature catalyst should be considered, and the system cost will have a certain proportion. Rise.