Process for extracting papermaking black liquor by steaming
A technology of papermaking black liquor and steam, which is applied in the field of papermaking production, can solve problems such as difficult deep extraction, achieve high economic benefits and environmental protection benefits, large volume, and reduce production costs
Inactive Publication Date: 2012-07-25
SHANGQIU FENGYUAN PAPER TECH
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The purpose of the present invention is to provide a process for extracting papermaking black liquor by steam method, realize the "three high" requirements of high black liquor extraction rate, high black liquor concentration and high black liquor temperature, reduce pulp production cost, and solve the special problem of papermaking black liquor It is the problem that the black liquor of caustic soda method grass pulp is not easy to be extracted deeply
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0019] The process of the present invention will be described in detail below in conjunction with the accompanying drawings. As shown in the accompanying drawings, one group of steam scrubbers of the present invention is made up of three steam scrubbers 3, 5, 7, and the steam scrubbers are cylindrical, and the bottom is provided with filter screens 19 and stirring blades 13, 16, 20. In this process method, two processes of steam washing pulp and feeding and discharging are alternately carried out to realize black liquor extraction. The quality of the steam introduced each time should account for one-third of the mass of the slurry added to the screw extrusion feeder each time, which is equivalent to a mass ratio of steam amount to feed amount of 1:3. At the same time, it is necessary to ensure that the amount of waste steam exiting the steam scrubber I3 is not more than one-fifth of the amount of incoming steam. Otherwise, the amount of fresh steam added should be appropriate...
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
Login to View More Abstract
The invention discloses a process for extracting papermaking black liquor by steaming. The key points of the process include: steam instead of water is used to wash pulp and the black liquor in a cylindrical steam washer; steam is used step by step in a mode of performing steaming pulp washing and charging and discharging two processes alternately; and high black liquor extraction rate, high black liquor concentration and high black liquor temperature are realized. The steam instead of water is used to wash the pulp and extract the black liquor, so the black liquor which is difficult to extract by water is extracted by displacement and a high black liquor extraction rate is realized; the volume of the steam serving as a washing medium is 1,700 times that of hot water, so the water consumption of the steam washing is reduced greatly, and the water carried to the black liquor is reduced; the concentration of the black liquid obtained by steam washing is improved obviously, and the temperature of the black liquor is improved; and the production cost of paper pulp is reduced, intermediate water processing load is relieved, and more economic and environmental-protection benefits are created.
Description
technical field [0001] The invention belongs to the field of papermaking production, and in particular relates to a process method for extracting pulp and papermaking black liquor. Background technique [0002] Pulping and papermaking waste liquor mainly containing inorganic alkali and organic matter and other pollutants will be produced during pulping and cooking production. This waste liquor is also called papermaking black liquor. It separates the waste liquor from the pulp through the pulp washing process, which is convenient for the subsequent treatment of the pulp and the treatment of the black liquor. The slurry washing process has dual functions of cleaning the slurry and extracting black liquor. In production, it is required to clean the slurry as much as possible, and at the same time obtain black liquor with high temperature and high concentration for treatment and utilization, so as to realize the "three highs" requirements of high black liquor extraction rate, ...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/10
Inventor 郭海军王首旗张传勇张孝义丁永恒李巨东
Owner SHANGQIU FENGYUAN PAPER TECH