High pressure compressor and steam explosion pulping method

a high-pressure compressor and steam explosion technology, which is applied in the field of cellulosic biomass feed material pretreatment, can solve the problems of large amount of steam, large pressure, and expansion of steam in the cells of feed materials, and achieve the effect of reducing the pressure of the pressurized feed material and rapid pressure reduction

Inactive Publication Date: 2008-11-13
ANDRITZ INC
View PDF23 Cites 57 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]A steam explosion pulping method has been developed comprising: impregnating a cellulosic biomass feed material in a pressurized reactor vessel; discharging the impregnated feed material from the vessel to a high pressure compressor; elevating a pressure of the feed material in the compressor; discharging...

Problems solved by technology

The rapid pressure reduction causes steam in the cells of the feed material to expand and thereby burst the cells.
A difficulty with this approach is that it requires a large amount of steam, e.g., 500-800 lbs of steam per ton of solid feed material, to heat...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High pressure compressor and steam explosion pulping method
  • High pressure compressor and steam explosion pulping method
  • High pressure compressor and steam explosion pulping method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013]A high pressure discharge compressor has been developed to pressurize a cooked cellulosic biomass feed material stream so that the stream may be subjected to steam explosion pulping. The high pressure discharge compressor applies centrifugal force to increase the pressure of a feed material stream from a pressurized reactor vessel. The centrifugal force applied to the stream increases the pressure to, for example, at least 0.5-1 bar above the pressure inside the cooking reactor. The pressurized stream is discharged from the compressor to a conduit that leads to a blow valve, where the steam explosion converts the feed material to pulp.

[0014]The high pressure discharge compressor may have a casing, rotating disc(s), drive motor, transmission and bearing, and maybe a front end screw that are similar to a conventional mechanical refiner, e.g., MDF refiner. The digester may have a scraper or a discharge conveyor (typically a screw) to feed the material to the compressor via a feed...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Pressureaaaaaaaaaa
Pressureaaaaaaaaaa
Pressureaaaaaaaaaa
Login to view more

Abstract

A steam explosion pulping method including: impregnating a cellulosic biomass feed material in a pressurized reactor vessel; discharging the impregnated feed material from the vessel to a high pressure compressor; elevating a pressure of the feed material in the compressor; discharging the pressurized feed material from the compressor to a conduit coupled to a blow valve; rapidly reducing pressure of the pressurized feed material as the feed material passes through the blow valve, and pulping the feed material by expansion of fluid in the feed material during the rapid pressure reduction.

Description

RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60 / 916,446 filed May 7, 2007, the entirety of which is incorporated by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to pre-treatment of cellulosic biomass feed materials, e.g., wood chips, for a steam explosion pulping. The invention relates particularly to discharging material from a digester and pressurizing a flow of steam and cellulosic material prior to steam explosion.[0003]Steam explosion pulping typically involves steam used to break apart the cellulosic fibers (explosion pulping) and has been used, for example, for enzyme hydrolysis. Pulp is produced from cellulosic biomass feed material by pressurizing feed material with steam and subsequently rapidly reducing the pressure of the feed material impregnated with the steam. The rapid pressure reduction causes steam in the cells of the feed material to expand and thereby burst the cells. Pulp...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): D21B1/12
CPCD21B1/12D21C1/02D21C5/00
Inventor PSCHORN, THOMASSABOURIN, MARCMRAZ, PETER
Owner ANDRITZ INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap