A kind of white mud lime kiln feeding method and its feeding device

Abstract

The invention provides a feeding method for lime mud of a lime kiln and feeding equipment, namely a triple feeding process for lime mud of a lime kiln. The method includes conveying wet lime mud from a causticization workshop section into a first feeding pushing device; allowing the wet lime mud to enter a riser tube of a flash dryer and to enter into a cyclone separator through a regulation baffle plate along with a rising flue gas stream; discharging the dried lime mud from the bottom of the cyclone separator; allowing the dried lime mud to drop to a lime mud sliding pipe; and conveying the dried lime mud to the bottom of a feeding end of the lime kiln by a second feeding pushing device, wherein when the wet lime mud which does not rise along with the flue gas stream in the riser tube of the flash dryer falls to the bottom of the flash dryer, the wet lime mud can be pushed to the feeding end of the kiln by a third pushing device. The method and the equipment can ensure drying effects of the lime mud, are well-adapted to changes of load and the dryness degree of the lime mud, and can effectively overcome the problem that ineffective circulation occurs due to material accumulation at the bottom of the flash dryer and due to that lime mud is taken away along with flue gas.

Description

Technical field [0001] The invention belongs to the field of pulping and papermaking, and relates to a feeding method of a lime kiln, in particular to a feeding method of a white mud lime kiln and a feeding device thereof. Background technique [0002] White mud, as the secondary pollution solid waste produced by the alkali recovery workshop of pulp and paper enterprises, for every ton of paper or 1 ton of pulp produced, 0.8-1 ton of papermaking white mud will be produced on average. The main component is green liquor (sulfate method). The precipitated calcium carbonate produced by the causticizing reaction (reaction of lime and carbonate ions) between the chemical liquid used in pulping and lime is highly alkaline and corrosive. [0003] At present, the most effective and commonly used method in the pulp and paper industry to treat alkali recovery white mud is to use the white mud rotary lime kiln to calcinate the white mud. The CaCO 3 It is converted into CaO and reused in the ca...

AI Technical Summary

Problems solved by technology

[0012] The second object of the present invention is to provide a triple propulsion feeding device that realizes the above method, solves the problem of ineffective circulation caused by the accumulation of materials and lime mud at the bottom of the flash dryer with the flue gas, and maximizes the use of new Adaptability, flexibility and convenience of feeding devices to production changes

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