Continuous boiling method and its device for semi chemical mechanical slurry of long bast fiber raw material

A bast fiber and chemical-mechanical technology, which is applied in the field of semi-chemical mechanical pulp continuous cooking of long bast fiber raw materials and its devices, can solve the problems of high price, economic loss, complex structure, etc., and achieves low production cost and easy maintenance. Effect

Inactive Publication Date: 2006-01-04
天津轻工业机械厂设计研究所 +3
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AI-Extracted Technical Summary

Problems solved by technology

Since the grinding discs of the pressure refiner are easy to wear parts, they need to be replaced frequently during the production process. At this time, it is necessary to spray the slurry in the continuous digester to reduce the pressure first, then stop the whole line, and then replace the grinding discs or repair them. This will undoubtedly cause huge economic losses
In addition, since the pressure refiner requires pressure resistance, its structure is relatively complicated and expensive, and many large pressure refiners still need to be imported. Therefore, many domestic paper mills hope to use domestic atmospheric pressure refiners for conti...
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Method used

As shown in Figure 2 and Figure 4, the long bast fiber raw material semi-chemical mechanical pulp continuous cooking method provided by the invention can also directly install semi-slurry on the discharge pipe of the second section cooking pipe 15 in the continuous cooking process Deflatter 20, make the long bast in the semi-slurry and the bigger pulp block pass through the rotary knife 25 and the bottom knife 26 with holes of the semi-slurry deconcentrator 20 to decompose, and pass through the machine installed in the semi-slurry deconcentrator 20 The orifice discharge valve 21 on the shell 27 discharges to the discharge bin 22 to reduce to a normal pressure state, and then is provided to each normal pressure refiner 18 by the distribution screw in the ...
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Abstract

The present invention relates to continuous boiling method and apparatus of semi-chemical mechanical slurry of long bast fiber raw material. During the continuous boiling process, cell bunker rotor valve is used after continuous boiling pipe to exhaust the semi-slurry after being boiled to the distribution bunker in normal pressure, or semi-slurry debonding device is used to debond long bast and large slurry block in the semi-slurry and orifice plate exhaust valve is used to spray the semi-slurry into spraying bunker in normal pressure. Therefore, normal pressure slurry grinding machine may be then used in grinding slurry of the continuously boiled long bast fiber semi-slurry in relatively low cost. In addition, the normal pressure slurry grinding machine may be overhauled easily at normal pressure without need of stopping the whole continuous boiling apparatus.

Application Domain

Cellulosic pulp after-treatmentContinuous pulping process +1

Technology Topic

Orifice plateBoiling process +6

Image

  • Continuous boiling method and its device for semi chemical mechanical slurry of long bast fiber raw material
  • Continuous boiling method and its device for semi chemical mechanical slurry of long bast fiber raw material
  • Continuous boiling method and its device for semi chemical mechanical slurry of long bast fiber raw material

Examples

  • Experimental program(1)

Example Embodiment

[0063] As mentioned above, because the semi-chemical mechanical pulp of long bast fiber raw materials such as cotton stalk and kenaf has the characteristics of high hardness and more long bast, if the atmospheric refiner is used for refining after continuous cooking, continuous cooking is required. The latter slurry is sprayed first to make it drop to normal pressure, but in this case, the half slurry after cooking is very easy to block the pipeline, so as figure 1 As shown, the feature of the semi-chemical mechanical pulp continuous cooking method for long bast fiber raw material provided by the present invention is that the grid rotor valve 16 is directly used after the two-stage cooking tube 15 in the continuous cooking process. Such as image 3 As shown, the grating rotor valve 16 can seal the pressure in the cooking tube, and there are a plurality of gratings 24 integrally formed with the rotor 23 so as to be rotatable, and the semi-slurry after cooking enters the upper grating of the rotor first. When the upper compartment is turned 180 degrees and is in an upside-down state, the half slurry and steam in it will enter the distribution compartment 17 in the normal pressure state by means of gravity and flash evaporation, so the normal pressure refiner 18 can be used for Refining.
[0064] Such as figure 2 , Figure 4 As shown, the semi-chemical mechanical pulp continuous cooking method for long bast fiber raw materials provided by the present invention can also be directly installed on the discharge pipe of the two-stage cooking tube 15 in the continuous cooking process to make the semi-slurry The long bast and larger pieces of slurry are decomposed by the rotary knife 25 of the semi-slurry decomposer 20 and the perforated bottom knife 26, and through the orifice plate discharge valve installed on the casing 27 of the semi-slurry decomposer 20 21 is sprayed to the spraying bin 22 and reduced to a normal pressure state, and then the distribution screw in the spraying bin 22 is provided to each normal pressure refiner 18 for refining. In addition, the rotor shaft of the semi-slurry decomposer 20 is equipped with a scraper, which can continuously clean the valve port of the orifice discharge valve 21 so as not to prevent the semi-slurry from being sprayed to the spraying bin 22. In this way, when a certain atmospheric refiner 18 needs to be repaired or the grinding disc needs to be replaced, it can be operated only by closing the feed valve of the equipment instead of shutting down the entire continuous cooking equipment. The low atmospheric pressure refiner 18 replaces the expensive pressure refiner for refining, and does not affect normal production and is easy to maintain.

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