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Method and device for oxidative conversion of sodium sulfide in alkali fusant

A conversion device and alkali-melt technology, applied in the field of pulp and paper making, can solve the problems of large evaporation of dilute black liquor and inability to recover lignin, reduce production costs, facilitate flow and discharge of furnace body, and improve oxidation reaction efficiency Effect

Active Publication Date: 2013-01-16
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Black liquor gasification also has the disadvantages of large evaporation of dilute black liquor and inability to recover lignin in black liquor

Method used

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  • Method and device for oxidative conversion of sodium sulfide in alkali fusant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as figure 1 , a method for oxidative conversion of sodium sulfide in an alkali melt, comprising the following steps:

[0041] 1. Furnace body preheating: open the hot gas flow control valve 2, introduce the hot tail gas from the furnace of the alkali recovery furnace, and preheat the furnace cavity 16 through the heat insulating pipe 1, and the preheating temperature is 600°C;

[0042] 2. Importing alkali melt: the alkali melt from the alkali recovery furnace enters the furnace chamber 16 through the alkali melt inlet 6, and the flow rate of the alkali melt is 2000kg / h (the processing capacity of the alkali recovery furnace is 100 tons / day);

[0043] 3. Introduce air: open the air flow control valve 4, the air enters from the air inlet 3, and the air flow is 50000m 3 / h, and mixed with hot gas in the heat-insulating pipe 1 to obtain mixed hot gas at 350-600°C;

[0044] 4. Control of hot gas flow: adjust the hot gas flow control valve 2 to control hot tail gas ent...

Embodiment 2

[0049] Such as figure 1 , a method for oxidative conversion of sodium sulfide in an alkali melt, comprising the following steps:

[0050] 1. Furnace body preheating: open the hot gas flow control valve 2, introduce the hot exhaust gas from the furnace of the alkali recovery furnace, and preheat the furnace cavity 16 through the heat insulating pipe 1, and the preheating temperature is 750°C;

[0051] 2. Importing alkali melt: the alkali melt from the alkali recovery furnace enters the furnace chamber 16 through the alkali melt inlet 6, and the flow rate of the alkali melt is 6000kg / h (the processing capacity of the alkali recovery furnace is 300 tons / day);

[0052] 3. Introduce air: open the air flow control valve 4, the air enters from the air inlet 3, and the air flow is 150000m 3 / h, and mixed with hot gas in the heat-insulating pipe 1 to obtain mixed hot gas at 350-600°C;

[0053] 4. Control of hot gas flow: adjust the hot gas flow control valve 2 to control hot tail gas...

Embodiment 3

[0058] Such as figure 1 , a method for oxidative conversion of sodium sulfide in an alkali melt, comprising the following steps:

[0059] 1. Furnace body preheating: open the hot gas flow control valve 2, introduce the hot tail gas obtained by burning fuel oil or fuel, and preheat the furnace chamber 16 through the heat-insulating pipe 1, and the preheating temperature is 900°C;

[0060] 2. Importing alkali melt: the alkali melt from the alkali recovery furnace enters the furnace chamber 16 through the alkali melt inlet 6, and the flow rate of the alkali melt is 50000kg / h (the processing capacity of the alkali recovery furnace is 2500 tons / day);

[0061] 3. Introduce air: open the air flow control valve 4, the air enters from the air inlet 3, and the air flow is 2500000m 3 / h, and mixed with hot gas in the heat-insulating pipe 1 to obtain mixed hot gas at 350-600°C;

[0062] 4. Control of hot gas flow: adjust the hot gas flow control valve 2 to control hot tail gas entering ...

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Abstract

The invention discloses method and device for oxidative conversion of sodium sulfide in alkali fusant. The method includes the steps of guiding alkali fusant generated in black liquor combustion from the bottom of an alkali recovery furnace into a furnace chamber; guiding out hot exhaust from a hearth of the alkali recovery furnace by an insulating pipe, mixing the hot exhaust with air and sending the mixture into the furnace chamber; allowing the alkali fusant to transverse spread to form a thin fluid layer under the action of a guide plate, allowing sodium sulfide in the thin fluid layer to contact with oxygen in the hot mixed gas to cause oxidation so as to generate sulfur dioxide and sodium carbonate. The sulfur dioxide and sodium carbonate subjected to subsequent treatment are reusable. The invention further discloses the device for oxidative conversion of sodium sulfide in alkali fusant. Automatic spreading of high-temperature fluid is achieved, oxidizing efficiency is improved, and the alkali fusant is guaranteed to exist in fluid form to facilitate flowing and outflowing from a furnace body.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and relates to the treatment of papermaking sewage, in particular to a method and a device for oxidizing and converting sodium sulfide in alkali melt produced by burning pulping black liquor. Background technique [0002] Pulping black liquor is viscous liquor produced by chemical pulping process. Black liquor contains a large amount of organic matter, the organic matter included is mainly alkali lignin, and also includes sodium hexa(or pentanoate), sodium acetate and sodium formate. , corresponding to different concentrations of black liquor, the total amount of COD (chemical oxygen demand, definition: the mass of oxygen element required for the complete oxidation of substances contained in a unit volume of wastewater) reaches 38400-1426000mg -l , is a potential source of water pollution, and any discharge will cause serious pollution. At the same time, the calorific value of bl...

Claims

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Application Information

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IPC IPC(8): C01B17/52C01D7/00
Inventor 农光再鲁炳辰李世强
Owner GUANGXI UNIV
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