Paper-making black liquor fluidized bed alkali reclaiming device and method

A papermaking black liquor and fluidized bed technology, applied in the direction of concentrating waste liquid, etc., can solve problems such as bed material coking, and achieve the effects of solving agglomeration, reducing operating costs, and solving pollution

Inactive Publication Date: 2008-07-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a fluidized bed alkali recovery device and method for papermaking black liquor in order to solve the problem of bed material coking in the incineration of papermaking black liquor in the existing fluidized bed alkali recovery technology

Method used

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  • Paper-making black liquor fluidized bed alkali reclaiming device and method

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specific Embodiment approach 1

[0008] Specific embodiment one: this embodiment is described in conjunction with Fig. 1, and this embodiment consists of multi-effect evaporator 1, disk evaporator 2, thick black liquor tank 3, black liquor pump 4, cyclone separator 5, material leg 6, flow Chemical bed alkali recovery furnace 7, burner 8, air chamber 9, electrostatic precipitator 10, dissolution tank 11, blower 12, silo 13, twisted cage 14, air preheater 15, air distribution plate 16, dryer 17, Causticizer 18, spray gun 19, induced draft fan 21 and chain plate slag extractor 22, multi-effect evaporator 1 communicates with disc evaporator 2 through pipeline, and disc evaporator 2 communicates with thick black liquor tank 3 through pipeline The thick black liquor tank 3 communicates with the black liquor pump 4 through the pipeline, and the black liquor pump 4 communicates with the spray gun 19 through the pipeline. The spray gun 19 is arranged on the top of the fluidized bed alkali recovery furnace 7, and the bo...

specific Embodiment approach 2

[0009] Specific embodiment two: present embodiment is illustrated in conjunction with Fig. 1, and the method of present embodiment is accomplished like this: the dilute black liquor that contains solid matter 8%-10% is concentrated to 25~30% through multi-effect evaporator 1, then passes through The disk evaporator 2 concentrates the black liquor to 40-45%, and the concentrated black liquor is sent to the spray gun 19 under the action of the black liquor pump 4, and then sent to the fluidized bed alkali recovery furnace 7 for incineration after being atomized. At the same time, using sodium-based zeolite as the bed material, the bed material is put into the silo 13, and the bed material enters the fluidized bed alkali recovery furnace 7 through the twisted cage 14, and the furnace temperature is controlled at 700-900°C. Using sodium-based zeolite as the bed material can ensure that the bed material does not coke, and the inorganic sodium salt and bed material produced by burnin...

specific Embodiment approach 3

[0010] Embodiment 3: The particle size of the sodium-based zeolite in this embodiment is 200-2000 μm. The particle gap in this range is small, and it is easier to form fluidization.

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Abstract

A device and a method for recovering alkali from black liquid of papermaking by using fluidized bed relates to a fluidized bed alkali recovery device and a process thereof. The invention solves the problems of the prior art such as bed material sintering during burning black liquid of papermaking. The device comprises a fluidized bed alkali recovery furnace communicated with a cyclone with a bottom dipleg communicated with the fluidized bed alkali recovery furnace, and an air blower respectively communicated with a burner, the dipleg, a lance and an air preheater through pipes. The method comprises the following step of pumping the black liquid to the fluidized bed alkali recovery furnace through a multi-effect evaporator, a disk evaporator and a concentrated black liquid tank by a black liquid pump, burning the black liquid at a furnace temperature of 700 to 900 DEG C by using sodium-based zeolite as the bed material to produce an inorganic sodium salt, and precipitating and separating the inorganic sodium salt and the bed material in a dissolving tank. The invention solves the problems of pellet coagulation and sintering of bed material of the fluidized bed, and the bed material can be repeatedly used, thus effectively solving pollution of papermaking industry.

Description

technical field [0001] The invention relates to a bed alkali recovery device and process for papermaking black liquor. Background technique [0002] In recent years, the pulp and paper industry is one of the most threatening industries to the water environment, especially the pollution of papermaking black liquor is the most serious. Alkali recovery technology is currently the most effective method for treating papermaking black liquor. Alkali recovery method can greatly reduce the high-load pollution of black liquor. In addition, it can also recover heat energy and chemicals. The traditional alkali recovery technology has a high initial investment, and it is difficult to promote it to the most polluting small and medium-sized paper mills in my country's paper industry, which is not in line with my country's national conditions. In contrast, the fluidized bed alkali recovery technology is simpler, safer, more economically reasonable and more adaptable than the traditional j...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/10
Inventor 别如山赵莹刘欢鹏陈志刚张洋姜雯雯
Owner HARBIN INST OF TECH
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