Method and device for medium-consistency refining and pumping

Abstract

The invention provides a method and a device for medium-consistency refining and pumping. The method comprises the following steps of: after low-consistency slurry is concentrated by concentration equipment, feeding the slurry into a medium-consistency vertical pipe to regulate the consistency; and after the consistency reaches a set value, pumping the slurry into a subsequent medium-consistency disk mill. The device comprises the concentration equipment, the medium-consistency vertical pipe, a medium-consistency pump, a slurry pipe and the medium-consistency disk mill which are connected in turn, wherein two white water pipelines on the medium-consistency vertical pipe are provided with a white water coarse adjustment valve and a white water fine adjustment valve respectively; a concentration meter connected with the white water fine adjustment valve is arranged on the slurry pipe; the concentration meter controls the opening of the white water fine adjustment valve in a PID adjustment mode; and a buffer segment is formed on the slurry pipe, wherein the pipeline length of the buffer segment is at least 2 meters; and the pipe diameter of the buffer segment is 2 to 3 times larger than that of the pipeline of a non-buffer segment. Compared with the conventional method for controlling and adjusting the pump output of the medium-consistency pump by using a liquid level, the device can stabilize the pump output flow better; simultaneously, the pumping potential of the medium-consistency pump is developed better, and the pumping consistency can be improved by 2 to 4 percent.

Description

Technical field [0001] The invention relates to the field of pulping and papermaking industry, in particular to a medium-consistency beating pumping method and device. Background technique [0002] The application of medium and high consistency pulping and papermaking technology is an important development direction of the pulping and papermaking industry. Its advantages in energy-saving, water-saving and consumption of chemical products have brought huge economic and social benefits to pulp and paper enterprises. Medium-consistency pumping is an indispensable key technology in these medium and high-concentration pulping production processes. In actual use, as the pulp concentration exceeds 6%, the fluidity of the pulp becomes more and more as the concentration increases. The worse, the slightly improper control and operation in production will often cause the pulp to fail to pump or block the pipeline during pumping, and the production system is very unstable. The current pumpin...

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