Filtrate sampling device
A novel filtrate sampling device for collecting a filtrate sample from a pulp solution. The filtrate sampling device includes: a jacket, a piston rod including a first end and second end, the piston rod being arranged inside the said jacket in the longitudinal direction of the jacket, and a hole screen arranged on the piston rod. The hole screen includes a number of holes in the piston rod.
1 . A filtrate sampling device for collecting a filtrate sample from a pulp solution, the filtrate sampling device comprising:
a jacket;
a hollow piston rod (i) comprising a first end, a second end, and an opening, (ii) being arranged inside the jacket in a longitudinal direction of the jacket, and (iii) being arranged to reciprocate inside the jacket in the longitudinal direction of the jacket; and
a hole screen arranged on the hollow piston rod, the hole screen comprising a number of holes, and the hole screen and the jacket having a clearance defined therebetween, wherein
an end edge of the jacket is arranged to contact the hole screen as the hollow piston rod moves into the jacket, and
the filtrate sampling device is equipped with backflush equipment comprising:
an empty space defined between an inner wall of the jacket and the hollow piston rod, the opening of the hollow piston rod providing a path between an interior of the hollow piston rod and the empty space, such that the empty space is in fluid communication with the holes of the hole screen through the interior of the hollow piston rod and the opening, and
a protrusion disposed around the hollow piston rod, the protrusion forming a piston that affects a volume of the empty space.
2 . The filtrate sampling device according to claim 1 , additionally comprising an actuator connected to the second end of the hollow piston rod and arranged to reciprocate the hollow piston rod inside the jacket in the longitudinal direction of the jacket.
3 . The filtrate sampling device according to claim 1 , wherein the hole screen is arranged at the first end of the hollow piston rod.
4 . The filtrate sampling device according to claim 1 , wherein the hollow piston rod extends to the inside of the jacket.
5 . A method for collecting a filtrate sample from a pulp solution, the method comprising:
collecting the filtrate sample from the pulp solution with the filtrate sampling device according to claim 1 , and
determining the chemical properties of the filtrate sample.