Apparatus for adding a first fluid into a second fluid with means to prevent clogging

An apparatus for adding a first fluid to a second fluid, comprising:

• a first conduit carrying a flow of the second fluid;
• a tube-shaped element in fluid communication with the first conduit, the tube-shaped element having a flow-through channel defined therein for carrying the flow of the second fluid, the flow-through channel having a substantially constant first cross-sectional area, the tube-shaped element having a circumference and a length, the flow-through channel maintaining a first pressure;
• the apparatus having a chamber defined therein, the chamber extending about a substantial portion of the circumference of the tube-shaped element and along a portion of the length of the tube-shaped element, the chamber maintaining a second pressure, the second pressure being greater than the first pressure;
• a connection in fluid communication with the first fluid for supplying the first fluid to the chamber;
• the tube-shaped element having a plurality of openings defined therein, the openings extending through a wall of the tube-shaped element, the openings being disposed adjacent to the chamber so that the first fluid having the second pressure in the chamber flows through the openings into the second fluid at the first pressure flowing inside the tube-shaped element, the openings having an open back edge;
• a second conduit attached to the tube-shaped element and directly downstream thereof, the second conduit having a second cross-sectional area being greater than the first cross-sectional area;
• and
• a movable shield arranged on an outside of the tube shaped element, the shield being movable to control a flow volume of the first fluid into the second fluid.