CN203429493U - Extraction device for pre-hydrolysate of steam pre-hydrolysed dissolving pulp - Google Patents

Extraction device for pre-hydrolysate of steam pre-hydrolysed dissolving pulp Download PDF

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Publication number
CN203429493U
CN203429493U CN201320516735.0U CN201320516735U CN203429493U CN 203429493 U CN203429493 U CN 203429493U CN 201320516735 U CN201320516735 U CN 201320516735U CN 203429493 U CN203429493 U CN 203429493U
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China
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pipeline
gas
prehydrolysis
condenser
liquid
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CN201320516735.0U
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Chinese (zh)
Inventor
周万勇
徐应盛
周嘉玮
樊春华
李正国
周鲲鹏
赵禾
余琳
吴健
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Hu'nan Juntai Pulp Paper Co Ltd
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Hu'nan Juntai Pulp Paper Co Ltd
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Abstract

The utility model discloses an extraction device for pre-hydrolysate of steam pre-hydrolysed dissolving pulp. The device is at least provided with a vertical steam cooker (1), a circulating system (2) of the vertical steam cooker (1), a fluid inlet pipe connected with the bottom of the vertical steam cooker, at least one first condenser (7) connected with the top of the vertical steam cooker (1) through a pipeline, at least one pre-hydrolysate tank (5) connected with a condensate outlet of the first condenser (7) through a pipeline, at least one gas-fluid separator (3) connected with the bottom of the vertical steam cooker (1) through a pipeline and at least one pre-hydrolysate tank (5) connected with a fluid outlet of the first gas-fluid separator (3) through a pipeline, wherein a gas outlet of the first gas-fluid separator (3) is connected with at least one of the condensers (4 and 7) through a pipeline; control valves are at least arranged on the pipeline for connecting the top of the vertical steam cooker with the condenser and the pipeline for connecting the bottom of the vertical steam cooker with the gas-fluid separator.

Description

A kind of steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element
Technical field
The utility model relates to dissolving pulp production technical field, especially relates to a kind of steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element.
Background technology
Cellulose is in short supply is an international problem, and how developing cellulose new resources has become a very actual and urgent directionality problem.Dissolving pulp, as the important source material of chemical fibre, is widely used in national economy, and social required quantity is large.Produce dissolving pulp and have two kinds of processes: prehydrolytic sulfate process and sulphite process.Prehydrolysis has sour prehydrolysis process, water prehydrolysis process and three kinds of modes of steam prehydrolysis process, is respectively to utilize acid solution, water and steam.Though the operating temperature of acid prehydrolysis process is lower, need to be equipped with acid cycle operative installations, the high and complicated operation of construction cost; Hot-water extraction method, the heating-up time is long, and the steam consumption is high, and time efficiency is low.Steam prehydrolysis process is to using saturated superheated steam as prehydrolysis agent, at high temperature carries out the method for prehydrolysis, and its mechanism of action is identical with water prehydrolysis process, but than water pre-hydrolyzed solution, than little, the H+ concentration in hydrolyzate is large, and hydrolysis is rapid, and the heating-up time is short, the general 10~30min that only needs.Steam prehydrolysis is simple to operate, and steam economy is few, and comparative maturity and economy, therefore mostly adopt vapor pre-hydrolysis technique in newly-built system.The step that steam prehydrolysis sulfate is produced dissolving pulp is summarized as follows:
(1) dress pot: when wood chip packs into, pass into low-pressure steam, can improve on the one hand dress pot density and temperature, can also remove the portion of air in wood chip on the other hand;
(2) heat up: first utilize low-pressure steam to heat, prehydrolysis is different according to assortment, temperature generally will not reach 165~172 ℃ not etc.;
(3) prehydrolysis: heat up and reach after desired prehydrolysis temperature, the P factor that insulation stays for some time and reaches certain;
(4) neutralization: be acid after prehydrolysis completes in pot, pH value about 2~3.In order to neutralize acidity, in the bottom of boiling vessel, be filled with the white liquid that accounts for greatly total alkali charge 30%;
(5) add alkali: add cooking liquor, the white liquid of residue and black liquor are added to the bottom of boiling vessel in proportion equably;
(6) boiling: secondary temperature elevation carries out kraft cooking, when liquid level surpasses middle circulation position in pot, can start the forced circulation that circulating pump carries out cooking liquor, and heat exchanger passes into middle pressure steam and heats up, and starts to carry out conventional kraft cooking operation;
(7) put pot: when the boiling H factor reaches technological standards value, can put pot.
Adopt in alkali and pre-hydrolyzed solution, pre-hydrolyzed solution merges in black liquor system, can be sent to chemical recovery system processes, significantly reduce the outer row's of pre-hydrolyzed solution problem, but pre-hydrolyzed solution can have influence on the quality of sending the rare black liquor of evaporation, cause evaporate station to produce unstable, on the other hand, neutralization stage white liquid used accounts for whole alkali charge 30% left and right, makes white liquid exorbitant expenditure, brings cost to rise.If pre-hydrolyzed solution is discharged in production process, can be used for producing the byproducts such as wood sugar, xylo-oligosaccharide, xylitol, Arabinose, ethanol or acetic acid, economic worth is higher, yet, in steam prehydrolysis process production process, pre-hydrolyzed solution volume after prehydrolysis is relatively less, people not yet consider it to extract, and on the other hand, from steam prehydrolysis process, produce dissolving pulp production process and extract pre-hydrolyzed solution, need special technology and device, in leaching process, be prone to the fault in productions such as obstruction.Current extraction element is generally difficult to pre-hydrolyzed solution effectively to reclaim.
Utility model content
In order to overcome the defect of prior art, technical problem to be solved in the utility model is to provide a kind of steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element.
In order to solve the problems of the technologies described above, the steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element that the utility model provides, at least has vertical digester; The circulatory system of vertical digester; The feed tube being connected with vertical digester bottom; The first condenser that at least one is connected with described vertical digester top by pipeline; The prehydrolysis liquid bath that at least one is connected with described the first condenser condenses liquid outlet by pipeline; The first gas-liquid separator that at least one is connected with described vertical digester bottom by pipeline; The prehydrolysis liquid bath that at least one is connected with described the first gas-liquid separator liquid outlet by pipeline; Described the first gas-liquid separator gas vent is connected with at least one condenser by pipeline; The pipeline that the pipeline that at least vertical digester top is connected with the first condenser, bottom are connected with the first gas-liquid separator, the feed tube being connected with vertical digester bottom are provided with by-pass valve control.
As further improvement technical scheme, the steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element that the utility model provides, between described the first gas-liquid separator liquid outlet and prehydrolysis liquid bath, also there is the heat exchanger that at least one is connected with prehydrolysis liquid bath with described the first gas-liquid separator liquid outlet by pipeline.
As further improvement technical scheme, the steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element that the utility model provides, also have the second condenser being connected by pipeline with described the first gas-liquid separator gas vent, described the first condenser and the second condenser are connected in parallel by pipeline.
As further improvement technical scheme, the steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element that the utility model provides, between described vertical digester top and the first condenser, also there is the second gas-liquid separator being connected with the first condenser with vertical digester top by pipeline, the gas vent of described the second gas-liquid separator is connected with the first condenser by pipeline, and the liquid outlet of the second gas-liquid separator is connected with prehydrolysis liquid bath by pipeline.
The beneficial effect that the utility model brings: the utility model adopts steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element cleverly, in vertical digester, fibrous raw material completes after steam prehydrolysis, by the feed tube from being connected with vertical digester bottom, in the vertical digester pressure release, inject flushing water, fibrous raw material in vertical digester after steam prehydrolysis rinses, from vertical digester bottom, collect pre-hydrolyzed solution, can obtain the pre-hydrolyzed solution that economic worth is higher, the amount that reduces neutralization stage white liquid used, reduces production costs.In leaching process, be not prone to clogging, be easy to realize commercial application.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is embodiment pre-hydrolyzed solution extraction element structural representation.
The specific embodiment
At steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element as shown in Figure 1, comprise vertical digester 1, the circulatory system 2 of vertical digester 1, the feed tube being connected with vertical digester bottom, the second gas-liquid separator 6 is connected by pipeline with the top of vertical digester 1, the gas vent of the second gas-liquid separator 6 is connected with the first condenser 7 by pipeline, the liquid outlet of the second gas-liquid separator 6 is connected with prehydrolysis liquid bath 5 by pipeline, and the condensate outlet of the first condenser 7 is connected with prehydrolysis liquid bath 5, the first gas-liquid separator 3 is connected by pipeline with vertical digester 1 bottom, the first gas-liquid separator 3 gas vents are connected with 7 with condenser 4 by pipeline, described the first gas-liquid separator 3 liquid outlets are connected by pipeline with heat exchanger (attached not shown), described heat exchanger is connected by pipeline with prehydrolysis liquid bath 5, the pre-hydrolyzed solution of gas-liquid separator 3 separation is sent in prehydrolysis liquid bath 5 after lowering the temperature by heat exchanger, described the first gas-liquid separator 3 gas vents are connected by pipeline with the second condenser 4, the condensate outlet of the second condenser 4 is connected by pipeline with prehydrolysis liquid bath 5, the first condenser 7 and the second condenser 4 are connected in parallel by pipeline.The pipeline that the pipeline being connected with the second gas-liquid separator 6 at vertical digester 1 top, vertical digester 1 bottom are connected with the first gas-liquid separator 3, the input duct being connected with vertical digester 1 bottom etc. are located according to technique and are controlled needs, are provided with a plurality of by-pass valve controls.
In steam prehydrolysis process dissolving pulp pre-hydrolyzed solution leaching process, comprise the steps: that the interior fibrous raw material of vertical digester 1 completes steam prehydrolysis, reaches target P factor values; Pressure release: described vertical digester 1 completes after the prehydrolysis of step steam, opens described vertical digester 1 top pressure relief valve, carries out pressure release, until described vertical digester 1 top pressure is no more than 0.4MPa, stops pressure release; Rinse: the interior implantation temperature of vertical digester 1 from the feed tube that is connected with vertical digester 1 bottom toward pressure release is the water of 165~172 ℃, and the interior fibrous raw material after steam prehydrolysis of vertical digester 1 rinses; Circulation flushing: start the circulatory system 2 of described vertical digester 1, from the middle part drawing liquid of described vertical digester 1, circulation fluid is sent into top and the bottom of described vertical digester 1; Pre-hydrolyzed solution is extracted: the circulatory system 2 of stopping vertical digester 1, from the bottom of described vertical digester 1, pre-hydrolyzed solution is sent into the first gas-liquid separator 3, the first gas-liquid separator 3 is separated into gas and liquid by pre-hydrolyzed solution, liquid is sent in prehydrolysis liquid bath 5 after heat exchanger is cooling, gas is sent in prehydrolysis liquid bath 5 after the second condenser 4 condensations, unhydrolysed fibrous raw material is stayed in digester 1, carries out follow-up boiling.In pressure leak process, the air-water mixture in vertical digester 1 enters the second gas-liquid separator 6, through the second gas-liquid separator 6, is separated into gas and liquid, and gas enters pre-hydrolyzed solution groove 5 after the first condenser 7 condensations, and liquid enters in prehydrolysis liquid bath 5; Liquid in prehydrolysis liquid bath 5 can be used for producing the byproducts such as wood sugar, xylo-oligosaccharide, xylitol, Arabinose, ethanol or acetic acid, and economic worth is higher.
Obviously, the utility model is not limited to above preferred embodiment, also can be in the spirit of the utility model claim and description restriction, carry out conversion and the improvement of various ways, can solve same technical problem, and obtain the technique effect of expection, therefore do not repeat.Those of ordinary skill in the art can be from the disclosed content of the utility model directly or all schemes of associating, as long as within the spirit limiting in claim, also belong to protection domain of the present utility model.

Claims (4)

1. a steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element, at least has vertical digester (1); The circulatory system (2) of vertical digester (1); Feed tube with vertical digester bottom is connected, is characterized in that: also have the first condenser (7) that at least one is connected with described vertical digester (1) top by pipeline; The prehydrolysis liquid bath (5) that at least one is connected with described the first condenser (7) condensate outlet by pipeline; The first gas-liquid separator (3) that at least one is connected with described vertical digester (1) bottom by pipeline; The prehydrolysis liquid bath (5) that at least one is connected with described the first gas-liquid separator (3) liquid outlet by pipeline; Described the first gas-liquid separator (3) gas vent is connected with at least one condenser (4,7) by pipeline; The pipeline that the pipeline that at least vertical digester (1) top is connected with the first condenser (7), bottom are connected with the first gas-liquid separator (3), the feed tube being connected with vertical digester (1) bottom are provided with by-pass valve control.
2. steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element according to claim 1, it is characterized in that: between described the first gas-liquid separator (3) liquid outlet and prehydrolysis liquid bath (5), also there is the heat exchanger that at least one is connected with prehydrolysis liquid bath (5) with described the first gas-liquid separator liquid outlet by pipeline.
3. steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element according to claim 1, it is characterized in that: also have the second condenser (4) being connected by pipeline with described the first gas-liquid separator (3) gas vent, described the first condenser (7) is connected in parallel by pipeline with the second condenser (4).
4. steam prehydrolysis process dissolving pulp pre-hydrolyzed solution extraction element according to claim 1, it is characterized in that: between described vertical digester (1) top and the first condenser (7), also there is the second gas-liquid separator (6) being connected with the first condenser (7) with vertical digester (1) top by pipeline, the gas vent of described the second gas-liquid separator (6) is connected with the first condenser (7) by pipeline, and the liquid outlet of the second gas-liquid separator (6) is connected with prehydrolysis liquid bath (5) by pipeline.
CN201320516735.0U 2013-08-23 2013-08-23 Extraction device for pre-hydrolysate of steam pre-hydrolysed dissolving pulp Expired - Lifetime CN203429493U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103451987A (en) * 2013-08-23 2013-12-18 湖南骏泰浆纸有限责任公司 Method and device for extracting pre-hydrolysis liquid from dissolving pulp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103451987A (en) * 2013-08-23 2013-12-18 湖南骏泰浆纸有限责任公司 Method and device for extracting pre-hydrolysis liquid from dissolving pulp
CN103451987B (en) * 2013-08-23 2015-10-28 湖南骏泰浆纸有限责任公司 A kind of dissolving pulp pre-hydrolyzed solution extracting method and device

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Granted publication date: 20140212

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