CN101967763A - Method for treating wood chips for digestion - Google Patents

Abstract

The invention discloses a method for treating wood chips for digestion. The method is characterized by comprising the following processes of: (1) conveying the wood chips to a wood chip washing machine for washing; (2) dehydrating the washed wood chips, then conveying the dehydrated wood chips to a wood chip thickness screen for screening, and directly conveying the screening qualified wood chips to a digester; and (3) pressing the screened thick chips into qualified wood chips in a thick chip thinning machine, and then conveying the qualified wood chips to the digester. The method thoroughly changes the traditional wood preparation process flow, introduces washing, thickness sorting and thinning treatment mechanisms, radically ensures the quality of the digested wood chips, meanwhile, enables the whole process to be compact and effective, is favorable for conveying materials, greatly reduces the investment cost, saves energy, reduces consumption, and remarkably improves the production efficiency.

Description

A kind of boiling processing method of wood chip

Technical field

The present invention relates to the processing method of boiling usefulness wood chip in a kind of pulping and paper-making production, particularly relate to the processing method of the boiling usefulness wood chip in the sulfate pulping technology.

Background technology

Because the wood raw material source is complicated, boiling is with fibroid in the wood chip and non-fiber impurity content and have the part wood chip to rot also to increase thereupon, only rely on the screening effect of traditional flow process of getting the raw materials ready to be difficult to guarantee the wood chip quality, thereby also be difficult to prepare high-quality slurry.

Summary of the invention

The object of the present invention is to provide a kind of application performance and energy-saving effect fabulous, can significantly improve the quality of sending the boiling wood chip, thereby the quality and the yield of boiling slurry are obviously improved, the wood chip processing method that thick slag rate reduces.

The technical solution used in the present invention is: a kind of boiling processing method of wood chip is characterized in that: comprise following process: Wood chip is sent into the wood chip rinsing maching wash, the discharging mass dryness fraction of wood chip rinsing maching is 3-6%, heavy seeds clearance 〉=98%;

Wood chip after cleaning is sent into the screening of dried thickness sieve after the dehydration of inclined screw Water Extraction Machinery, screen qualified wood chip and directly send digester, the discharging mass dryness fraction 40-45% of inclined screw Water Extraction Machinery, sheet clearance 〉=98% of thickness sorting machine;

The sheet that filters out is sent into and is sent into digester again, the ironed efficient of the sheet of sheet thinning machine 〉=80% after the sheet thinning machine is pressed into accepted chips.

The washings that produce in the described process enter the circulating water pool precipitation after filtering, pump to wood chip rinsing maching circulating and recovering through water circulating pump, washings circulating and recovering rate 〉=70%.

Wood chip rinsing maching of the present invention adopts the cleaning equipment of wood chips of the double-cylinder type frequency control in the patent application 201010232884.5, cooperate the thickness sorting machine of wood chips of the moving plate type that can control rotating speed among the patent application 201010232885.x and the blocked up wood chip crushed machine of the double-roll type in the patent application 201010233151.3, realize not having stopping up and evenly handle wood chip continuously automatically.During work: at first wood chip is sent into the wood chip rinsing maching by belt conveyor, wood chip after cleaning is sent into the dried thickness sieve after entering the spiral dewater dehydration, screen qualified wood chip and directly send digester, the sheet that filters out is sent into and is sent into digester again after the sheet thinning machine is pressed into accepted chips.Wherein the sheet thinning machine with blocked up wood chip pressure break, total wood chip qualification rate is promoted more than 20%, thereby the first mate improves the quality and the yield of boiling slurry, reduces thick slag rate by the mode of powerful extruding.The present invention adopts oblique net filtration machine that the washings that produce in the technology are carried out automatic fitration and handles, and realizes washings 70% above circulating reflux use, and the water-saving rate height is environmentally friendly.

The present invention thoroughly changes traditional woodworking flow process fully, introduce washing, thickness sorting and ironed treatment mechanism, wood chip elder generation washing dehydration is delivered to thickness sorting again to be screened, again underproof sheet is carried out ironed processing, fundamentally guarantee to send the quality of boiling wood chip, made whole flow process compact and effective simultaneously, helped the conveying of material, significantly reduce investment cost, energy-saving and cost-reducing and significantly improve production efficiency.

Description of drawings

Fig. 1 is a process chart of the present invention;

Among Fig. 1,1 is the wood chip rinsing maching; 2 is the inclined screw Water Extraction Machinery; 3 is thickness sorting machine of wood chips; 4 is shake formula dewatering screen; 5 is the sheet thinning machine; 6 is water circulating pump; 7 is oblique net filtration machine; 8 is circulating water pool; 9 is belt conveyor.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the present invention is elaborated:

From the technological process of Fig. 1 as can be known: the wood chip of outsourcing or cutting at first enters wood chip rinsing maching 1 and washs, wood chip after cleaning enters inclined screw Water Extraction Machinery 2 and sloughs a large amount of free moisture, directly fall into thickness sorting machine of wood chips 3 and carry out thickness sorting, the accepted chips that sub-elects flows into shake formula dewatering screen 4 and further dewaters, after belt feeder 9 is sent into digester; Blocked up thick excessively wood chip is sorted out by thickness sieve 3, sends into sheet thinning machine 5 and carries out ironed processing, handles and sends into digester again after qualified; The washings of wood chip rinsing maching 1, inclined screw Water Extraction Machinery 2 and 4 discharges of shake formula dewatering screen are concentrated the oblique net filtration machine 7 of sending into simultaneously, enter circulating water pool 8 behind the impurity such as a large amount of silt and wood chip in the elimination washings, pump to wood chip rinsing maching 1 through post precipitation by water circulating pump 6 and carry out circulating and recovering.

In the technology of Fig. 1 of the present invention, the wood chip rinsing maching adopts double-cylinder type wood chip rinsing maching, and removal of impurity such as iron-stone silt particle wood chip are more than 98%; Wood chip carrying out washing treatment ability: 200～1000m ³/ h, sheet thinning machine ability: 50～200 m ³/ h; Thickness sorting machine of wood chips adopts the dish roll-type thickness sorting machine of independent development, effectively removes the blocked up wood chip in qualified, and the sheet clearance is more than 95%; The sheet thinning machine adopts the Hydraulic Double roll-type wood chip thinning machine of independent development design, and sheet is carried out mechanical conquassation, is convenient to the cooking liquor infiltration, makes knaur generate high-quality paper pulp, improves 2 to 3 percentage points of pulping yield.

Facts have proved, the application performance and the energy-saving effect of process of the present invention are fabulous, significantly improve the quality of sending the boiling wood chip, thereby the quality and the yield of boiling slurry are obviously improved, thick slag rate reduces, and simultaneity factor adopts DCS to carry out whole-process automatic control, and it is extremely low that runnability is stablized fault rate, washings circulating and recovering treatment system has solved problem of environmental pollution, and whole flow process has advantages such as apparatus arrangement compactness, investment cost are extremely low, simple and convenient operation and maintenance.

Claims (2)

1. a boiling is characterized in that: comprise following process with the processing method of wood chip:

Wood chip is sent into the wood chip rinsing maching wash, the discharging mass dryness fraction of wood chip rinsing maching is 3-6%, heavy seeds clearance 〉=98%;

Wood chip after cleaning is sent into the screening of dried thickness sieve after the dehydration of inclined screw Water Extraction Machinery, screen qualified wood chip and directly send digester, the discharging mass dryness fraction 40-45% of inclined screw Water Extraction Machinery, sheet clearance 〉=98% of thickness sorting machine;

The sheet that filters out is sent into and is sent into digester again, the ironed efficient of the sheet of sheet thinning machine 〉=80% after the sheet thinning machine is pressed into accepted chips.

2. according to the described wood chip processing method of claim 1, it is characterized in that: the washings that produce in the described process enter the circulating water pool precipitation after filtering, pump to wood chip rinsing maching circulating and recovering through water circulating pump, washings circulating and recovering rate 〉=70%.

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