Method for continuously cooking grass raw materials and equipment used in same
A technology for cooking equipment and grasses, which is applied in the field of pulp and paper making, can solve the problems of removal, consumption of cooking liquid, and great environmental harm, and achieve the effects of reducing fiber damage, reducing energy consumption, and improving alkali recovery rate.
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[0111] Example 1
[0112] Choose wheat straw as the raw material, prepare the material by dry method, cut it in a hammer mill, squash, knead into flakes, filaments, winnowing, screening, and dust removal. At this time, the length of the wheat straw flakes is about 20mm , The impurity removal rate reaches 30%.
[0113] Then the metered wheat straw is squeezed through a screw feeder to form a plug. When the plug enters the T-shaped tube, the plug of wheat straw expands rapidly and the dipping liquid is quickly sucked in and mixed uniformly. The dipping liquid is composed of black liquor and caustic soda. Composition: Alkali amount for cooking: 18%, anthraquinone: 0.06%, temperature 130°C, liquid ratio controlled at 1:4.5, black liquor solids concentration 13%, and immersion liquid temperature 110°C.
[0114] The wheat straw mixed with the immersion liquid and the hot black liquor enter the immersion area in the vertical continuous cooking pot through the pot loader for immersion treat...
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[0119] Example 2
[0120] The straw raw material is removed from the mildew and rotten part of the forage. The straw raw material with a length of 500-800mm enters from the entrance of the new type of grass preparation machine through a belt conveyor at a feeding speed of 0.6m / s. The rotation speed of the new type of grass preparation machine is At 740 rpm, after the raw material enters the treatment, the straw raw material with a length of 30-50 mm is discharged at the outlet. Enter the cyclone dust collector system for dust removal treatment, and the straw raw materials enter the cylindrical sieve for screening, and the dry preparation and impurity removal rate of the method is 33%.
[0121] The prepared rice straw raw materials enter the T-shaped tube through the extruder, and add the immersion liquid. The immersion liquid is composed of black liquor and caustic soda. The alkali concentration is 28 g / liter, and the concentration of the black liquor at 95°C and 20°C is 11.1°Be' ...
Example Embodiment
[0126] Example 3
[0127] Reed is selected as the raw material, and the material is prepared by dry method. It is cut, squashed, kneaded into flakes or filaments in a hammer mill, after wind selection, screening, and dust removal. The impurity removal rate reaches 28%.
[0128] Then the metered reed is extruded through a screw feeder to form a plug. When the plug enters the T-shaped tube, the plug of the reed expands rapidly and is quickly sucked in by adding the dipping liquid and mixed uniformly. The dipping liquid is composed of black liquor and caustic soda, It is composed of sodium sulfide, the amount of alkali used is 10%, the sulfidity is 8%, the temperature is 120°C, the liquid ratio is controlled at 1:4.5, and the black liquor solid content is 14%.
[0129] The reed mixed with the dipping liquid and the hot black liquid are put into the dipping zone in the vertical continuous cooking pot through the pot loader, and the liquid ratio is controlled. At this time, the liquid rat...
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