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A black liquor heat treatment process in alkali recovery

A technology of heat treatment and black liquor, which is applied in the regeneration of lye, etc., can solve the problems of excessive black liquor foam, lower black liquor solid concentration, and increased black liquor combustion heat loss, so as to save plant space and avoid waste and loss , cost-saving effect

Inactive Publication Date: 2011-12-14
YIBIN GRACE GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention aims to solve the problem that the black liquor is directly heated in the alkali recovery process of the prior art, resulting in too much foam of the black liquor, so that the temperature cannot be raised to the temperature required by the process, and provides a black liquor heating treatment process, so that the black liquor can be quickly Reach the temperature required by the process
[0009] Another object of the present invention is to solve the problem that direct heating causes the concentration of black liquor solids to decrease, increase the heat loss of black liquor combustion, and the combustion of alkali furnace is unstable, keep the solid concentration of black liquor, and reduce the heat loss of black liquor combustion. Make the black liquor burn more stably after entering the alkali furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A. Pump the thick black liquor out of the storage tank;

[0031] B. Send the extracted thick black liquor to the tubular heater through the pipeline, and the steam enters the steam chamber of the heater to heat the pipeline. The black liquor passes through the pipeline and is indirectly heated by the steam; the heating method adopts reverse heating, That is, the steam process is from the high temperature section to the low temperature section, and the black liquor process is reversed from the low temperature section to the high temperature section for heat exchange;

[0032] C. After the black liquor is heated to 105°C, it directly enters the alkali furnace for alkali recovery operation.

Embodiment 2

[0034] A. Pump the thick black liquor out of the storage tank;

[0035] B. Send the extracted thick black liquor to the tubular heater through the pipeline, and the steam enters the steam chamber of the heater to heat the pipeline. The black liquor passes through the pipeline and is indirectly heated by the steam; the heating method adopts reverse heating, That is, the steam process is from the high temperature section to the low temperature section, and the black liquor process is reversed from the low temperature section to the high temperature section for heat exchange;

[0036] C. After the black liquor is heated to 120°C, it directly enters the alkali furnace for alkali recovery operation.

Embodiment 3

[0038] A. Pump the thick black liquor out of the storage tank;

[0039] B. Send the extracted thick black liquor to the tubular heater through the pipeline, and the steam enters the steam chamber of the heater to heat the pipeline. The black liquor passes through the pipeline and is indirectly heated by the steam; the heating method adopts reverse heating, That is, the steam process is from the high temperature section to the low temperature section, and the black liquor process is reversed from the low temperature section to the high temperature section for heat exchange;

[0040] C. After the black liquor is heated to 113°C, it directly enters the alkali furnace for alkali recovery operation.

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Abstract

The invention provides a technology for heating and processing black liquor in alkali recovery, belonging to the field of papermaking and pulping. In the technology, a tubular heater is adopted to indirectly heat the black liquor; and heat exchange is carried out in a reverse heating mode, so that the black liquor can quickly achieve temperature required by the technology, the concentration of the solid matter in the black liquor is kept, the burning heat loss of the black liquor is lowered, and the black liquor can more stably burn after entering an alkali boiler.

Description

technical field [0001] The invention relates to a process for treating waste liquor in a pulping process, more specifically, the invention relates to a process for heating black liquor in an alkali recovery system. Background technique [0002] Black liquor is the washing liquid of pulp after washing and cooking in the pulping process of kraft method or caustic soda method. degradation products and organic acids. Inorganic substances include free sodium hydroxide, sodium sulfate, sodium sulfide, sodium carbonate, sodium and silicon dioxide combined with organic substances. [0003] Discharging black liquor directly into rivers will cause pollution and should be recycled. The treatment method is to first evaporate and concentrate the black liquor, and then burn it in an alkali furnace to recover soda ash. The heat generated by combustion is recovered as steam. Most of the inorganic substances become molten during combustion and become green liquor after dissolution. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/04
CPCY02P70/10
Inventor 何德明
Owner YIBIN GRACE GROUP CO LTD
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