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Micro-negative pressure black liquor gasification method and system device

A micro-negative pressure, black liquor technology, applied in chemical instruments and methods, inorganic chemistry, chemical industry, etc., can solve problems such as black liquor pollution, reduce production costs, avoid air leakage, and reduce production costs.

Active Publication Date: 2016-08-17
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a micro-negative pressure black liquor gasification method and system device for the serious pollution of black liquor produced in the papermaking pulping process and the existing problems of conventional black liquor gasification methods. Air leakage phenomenon, when the feed is not smooth during production, it can be handled randomly to avoid overall shutdown and improve production efficiency

Method used

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  • Micro-negative pressure black liquor gasification method and system device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Start the oxygen generating system 12 to continuously produce sufficient oxygen and deliver it to the black liquor gasifier 1. Burn fuel oil to preheat the black liquor gasification furnace 1. When the furnace temperature reaches 500°C, inject black liquor with a weight percentage of 75% to let the fuel oil and black liquor mix and burn, so that the furnace temperature rises to 1000°C. Under the premise that the temperature rises slowly or remains unchanged, the fuel flow is gradually reduced until the fuel supply is stopped, so that the black liquor burns alone. After keeping the black liquor burning alone for 10 minutes, adjust the flow of oxygen and black liquor so that the weight ratio of oxygen to black liquor is 0.4 to reach a normal gasification state.

[0030] The alkali melt discharged from the black liquor gasification furnace 1 is dissolved in the alkali melt dissolution tank 2 to generate green liquor, which is discharged in a liquid state and then transport...

Embodiment 2

[0033] Start the oxygen generating system 12 to continuously produce sufficient oxygen and deliver it to the black liquor gasifier 1. Burn the gas to preheat the black liquor gasification furnace 1. When the furnace temperature reaches 700°C, inject black liquor with a weight percentage of 40% to let the gas and black liquor mix and burn, so that the furnace temperature rises to 1500°C. Under the premise that the temperature rises slowly or remains unchanged, the gas flow rate is gradually reduced until the gas supply is stopped, so that the black liquor can be burned alone. After keeping the black liquor burning alone for 30 minutes, adjust the flow of oxygen and black liquor so that the weight ratio of oxygen to black liquor is 0.48, and the normal gasification state is reached.

[0034] The alkali melt discharged from the black liquor gasification furnace 1 is dissolved in the alkali melt dissolution tank 2 to generate green liquor, which is discharged in a liquid state and...

Embodiment 3

[0037] Start the oxygen generating system 12 to continuously produce sufficient oxygen and deliver it to the black liquor gasifier 1. Burn fuel oil to preheat the black liquor gasification furnace 1. When the furnace temperature reaches 600°C, inject black liquor with a weight percentage of 60% to let the fuel oil and black liquor mix and burn, so that the furnace temperature rises to 1200°C. Under the premise that the temperature rises slowly or remains unchanged, the fuel flow is gradually reduced until the fuel supply is stopped, so that the black liquor burns alone. After keeping the black liquor burning alone for 20 minutes, adjust the flow of oxygen and black liquor so that the weight ratio of oxygen to black liquor is 0.45 to reach a normal gasification state.

[0038] The alkali melt discharged from the black liquor gasification furnace 1 is dissolved in the alkali melt dissolution tank 2 to generate green liquor, which is discharged in a liquid state and then transpor...

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Abstract

The invention discloses a micro-negative pressure black liquid gasification method and a system apparatus thereof. The method comprises the following steps: gasifying a black liquid at a high temperature under a micro-negative pressure with the black liquid as a raw material, oxygen as a combustion improver, water vapor as a gasifying agent and a black liquid gasifying furnace as a reactor to generate a rough gasified gas, allowing the rough gasified gas to go through a waste heat boiler to recover heat, and carrying out spray cooling and spray desulphurization to obtain a purified gasified gas with H2 and CO as main components. The invention also discloses the system apparatus using the method. The system apparatus enables the black liquid gasification method to be carried out under the micro-negative pressure, so a gas leakage phenomenon of the black liquid gasifying furnace and in the gas conveying process can be avoided; and when a spray gun is blocked, the spray gun can be momentarily replaced and processed, so the production efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to pulping and papermaking black liquor treatment, in particular to a micro-negative pressure black liquor gasification method and a system device. Background technique [0002] The black liquor produced in the papermaking pulping process contains a large amount of biomass, and its total calorific value is about 13.4kJ / g-15.6kJ / g, which is an available resource. The traditional treatment method of black liquor is to burn the concentrated black liquor in an alkali recovery furnace, and then use or dispose of various products obtained from the combustion. The pollution of this treatment method is serious, and the recovery rate of heat energy is also low. As a new alternative, the black liquor gasification technology can effectively improve the thermal energy utilization rate of black liquor and reduce the discharge of pollutants. It can not only significantly improve the economic benefits of enterprises, but also make it easier for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/36
CPCY02P20/10Y02P20/129
Inventor 农光再陈溢一邓卓李世强
Owner GUANGXI UNIV