NOx-separation
back
to index to
range of washers |
| Products-
Washer programme |
|
NOx
separation from waste air
Method of recovery of raw materials from waste gas without any
origin of waste |
|
| 4. Example
of the use : 4.2.3 DGE
– instrumentation |
| For controlling
and checking purified gas values and for the system control it is used
a measuring system which has been developed specially for this process.
In the purified gas it is measured at the same time NO-, NO2-
ucontent and as a supplement also oxygen content. On the basis of experience
it is possible to start from the fact that in the purified gas mostly
NO is contained taking into consideration the fact that time of pause
for a complete NO oxidation is a phase all the time which is determined
by velocity. As measuring instruments they are used sensors with the following
measuring ranges: : |
| NO |
0 to 1000 |
ppm |
| NO2 |
0 to 100 |
ppm |
|
|
| Additionally, it
is possible to dilute the taken off measured gas with the use of false
air in a ratio of 1:10. In this way it is possible to attain a higher
service life of the sensors. In addition to it, it is possible in this
way to include also other points with higher concentrations i.e. by switching
a measuring point. One example of ratio NO2/NO– in the
purified gas on the outlet of the purification equipment found in that
way is presented in Figure 3. In this way, measured values of the purified
gas are transferred into the control of the equipment and serve as a control
variable for proportioning hydrogen peroxide or for switching over the
adsorber. |
|
| Measured
values of NO2/NO-ratio in the purified gas on the outlet from
the purification unit to remove NOx- ( Figure 3) |
|
|
|
NOx-separation
back
to index to
range of washers |