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Method for recovering pulping black liquor alkali by virtue of sulfate process

A recovery method and black liquor caustic soda technology, applied in the regeneration of lye, lime production and other directions, can solve problems such as the inability to efficiently absorb H, and achieve the effects of increasing the carbon conversion rate, eliminating the danger of explosion when encountering water, and avoiding corrosion.

Inactive Publication Date: 2011-07-13
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

NaHCO 3 Although no longer absorbing CO 2 , but it also cannot efficiently absorb H 2 S

Method used

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  • Method for recovering pulping black liquor alkali by virtue of sulfate process
  • Method for recovering pulping black liquor alkali by virtue of sulfate process

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Embodiment 1

[0032] Such as figure 1 shown. 1 set of 240tds / d (tons of solids per day) gasification alkali recovery system, the solid content of the black liquor treated is 62%, the total sulfur content is 3.17%, the sodium content is 16.9%, and the high calorific value on a dry basis is 13MJ / kg. The liquid power is equivalent to about 36MW; the thick black liquor from pipeline 5 (with Glauber's salt added according to the prior art) has a temperature of 100°C, a flow rate of 16.14t / h, and Na 2 O 3TiO 2 The mass flow rate is 7.93t / h; the average operating temperature of pyrolysis furnace 1 is 850°C, and the air volume of pyrolysis furnace 1 is 9240m 3 / h (normal state), ignoring the temperature drop of the gas discharged from the pyrolysis furnace 1, the volume flow rate of the gas entering the gasification furnace 2 from the pipeline 8 is 47500m 3 / h, mainly water vapor and carbon dioxide, the materials transported into the gasifier by the conveying equipment 7 are black liquor semi-co...

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Abstract

The invention relates to a process for recovering pulping black liquor alkali by virtue of a sulfate process by taking gasification and direct causticication as a base. The process comprises: the pulping sulfate black liquor is sprayed by atomizing air into a pyrolysis furnace for partial combustion, thus generating semicoke, vapor, tar, sulfurated hydrogen and other sulfur-containing compounds; the semicoke is mixed with a directly causticizing agent; the mixture is fed to a gasification furnace; gaseous products are also sent to the gasification furnace; organic substances in the semicoke are gasified completely at 800-900 DEG C; the sodium sulfide generated by reduction from sodium sulfate is completely transferred as the sulfurated hydrogen to enter into the gas phase; all sodium carbonate is subjected to carbon dioxide removal to form a solid sodium salt; the solid sodium salt is hydrolyzed to generate sodium hydroxide; the part which is not dissolved in the water is recycled as the directly causticizing agent; the sulfurated hydrogen in the generated gas is absorbed by part of the sodium hydroxide generated by the hydrolysis to prepare a sulfur-rich white liquid; and the gas can be taken as a fuel for downstream combustion equipment. By utilizing the method provided by the invention, a lime calcining kiln can be omitted or the load of the lime calcining kiln can be greatly reduced; and the recovered alkaline can be used for improving a sulfate steaming process.

Description

technical field [0001] The invention relates to the technical field of pulping black liquor alkali recovery, in particular to a method for pulping sulfate black liquor alkali recovery with gasification as the core. technical background [0002] During the pulping and cooking process, the substances dissolved from wood or other fiber raw materials mainly include lignin, hexonic acid, low molecular weight organic acids and extractives. These organic matter combine with NaOH to form sodium salt under the action of cooking liquid. [0003] Black liquor (hereinafter referred to as sulfate black liquor) inorganic substances include NaOH, Na 2 CO 3 、Na 2 S, Na 2 SO 4 、Na 2 S 2 o 3 , NaCl, etc. NaCl mainly comes from wood raw materials, and the vast majority of other substances are pulping white liquor residues. [0004] The traditional alkali recovery method is to burn the black liquor to generate CO 2 and H 2 O, thermal energy is used to produce steam; the inorganic mat...

Claims

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Application Information

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IPC IPC(8): D21C11/04
CPCY02P40/40
Inventor 阴秀丽袁洪友吴创之周肇秋王贵金
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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