DFF air volume measurement device is based on the back-to-back measurement principle: the
measurement device is installed on the pipe, Its probe is inserted
into the tube, When there is an air flow in the tube, Against the
wind side, The kinetic energy of the airflow is converted into
pressure energy, So the pressure in the face tube is higher, Its
pressure is called "full pressure", The leeward side is not subject
to airflow stamping, The pressure in the pipe is the static
pressure in the air duct, Its pressure is called the "static
pressure", The difference between full pressure and static pressure
is called the differential pressure, Its size is related to the
pipe wind speed (quantity), The greater the wind speed (volume),
Greater the differential pressure: less wind speed (quantity), The
differential pressure is also small, therefore, Just measuring the
size of the trip pressure, Then find the corresponding relationship
between travel pressure and wind speed (quantity), You can
correctly measure the air volume in the pipe. Because the primary
and secondary air volume and pulverizing air duct section is
relatively large, for the wind volume measurement, only one
measurement point is not enough, in order to be able to accurately
measure the boiler primary and secondary air volume and pulverizing
ventilation, we use the method is to use the same section on the
section of the gale. According to the above measurement principle,
according to the size of the measuring section size, the length of
the straight section and other factors to determine the measuring
points, many measuring points such as organically assembled
together, positive pressure side and positive pressure side,
negative pressure side and connected with negative pressure side,
positive and negative pressure side each lead a total lead tube,
respectively with the differential pressure transmitter of positive
and negative end, measure the average speed of the section, and
then calculate the air volume. Practice has proved that the device
can be used reliably for a long time and become a maintenance-free
product.
