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Method for efficient resource utilization of lignite

A technology of recycling lignite, which is applied in the preparation of liquid hydrocarbon mixtures, dry distillation in special forms, and the petroleum industry, can solve the problems that lignite cannot meet the calorific value requirements of power plants, increase the yield of coal tar, improve the utilization value, and can The effect of increasing the modulation range and modulation rate

Active Publication Date: 2018-07-17
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When lignite is used as fuel, due to its high water content, a large amount of CO is released during its combustion process. 2 , and the evaporation of water takes away a large amount of heat, so that burning lignite alone often cannot meet the calorific value requirements of the power plant

Method used

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  • Method for efficient resource utilization of lignite
  • Method for efficient resource utilization of lignite
  • Method for efficient resource utilization of lignite

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This embodiment adopts Yunnan lignite as raw material, according to figure 1 The process flow shown is for efficient resource utilization of lignite. The industrial analysis and element analysis of Yunnan lignite are shown in Table 1.

[0035]

[0036] The Yunnan lignite is crushed and screened to obtain lignite pulverized coal with a particle size below 0.3 mm. Take 50Kg of crushed lignite and add it into 200Kg of acidic mine wastewater rich in calcium ions at room temperature, and perform ion exchange for 24 hours. The composition of mine wastewater is shown in Table 2.

[0037]

[0038] After the ion-exchanged lignite is filtered by a suction filter, it is dried under hot pressure at 200° C. and 10 MPa, and the holding time is 20 minutes. After drying, the lignite is pyrolyzed at a medium temperature in a fixed-bed reactor with a pyrolysis temperature of 700°C and a pyrolysis time of 60 minutes. Pyrolysis produces pyrolysis gas, tar and semi-coke, of which ...

Embodiment 2

[0043] This embodiment adopts Inner Mongolia lignite as raw material, according to figure 1 The process flow shown is for efficient resource utilization of lignite. The industrial analysis and elemental analysis of Inner Mongolia lignite are shown in Table 3.

[0044]

[0045]The Inner Mongolia lignite is crushed and screened to obtain lignite pulverized coal with a particle size below 0.3mm. Take 50Kg of crushed Inner Mongolian lignite and add it to 300Kg of calcium ion-rich acid mine wastewater in Example 1 at room temperature, and perform ion exchange for 30 hours.

[0046] Filter the ion-exchanged lignite, and dry it under hot pressure at 220°C and 8Mpa for 15 minutes under pressure. After drying, the lignite is pyrolyzed at a medium temperature in a fixed-bed reactor with a pyrolysis temperature of 650°C and a pyrolysis time of 30 minutes. Pyrolysis produces pyrolysis gas, tar and semi-coke, of which the yield of semi-coke is 29.7Kg, with a yield of 59.3wt%, and the...

Embodiment 3

[0051] This embodiment adopts Indonesian lignite as raw material, according to figure 1 The process flow shown is for efficient resource utilization of lignite. The industrial analysis and elemental analysis of Indonesian lignite are shown in Table 4.

[0052]

[0053] The Indonesian lignite is crushed and screened to obtain lignite pulverized coal with a particle size below 0.3mm. Take 50Kg of crushed lignite and add it into 150Kg of acidic mine wastewater rich in calcium ions at room temperature, and perform ion exchange for 36 hours. The composition of mine wastewater is shown in Table 2.

[0054] Filter the ion-exchanged lignite and dry it under hot pressure at 180°C and 12Mpa for a holding time of 20 minutes. After drying, the lignite is pyrolyzed at a medium temperature in a fixed-bed reactor with a pyrolysis temperature of 800°C and a pyrolysis time of 30 minutes. Pyrolysis produces pyrolysis gas, tar and semi-coke, of which the yield of semi-coke is 30.7Kg, with...

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Abstract

The invention relates to a method for efficient resource utilization of lignite. The method includes the steps that ion exchange of lignite with mine wastewater containing calcium ions is performed, medium-temperature pyrolysis is performed on the lignite loaded with the calcium ions to obtain pyrolysis semi-coke, water vapor and CO2 are used for co-gasification activation of the pyrolysis semi-coke, the semi-coke loaded with calcium after gasification is obtained and used for flue gas desulfurization, the vulcanized semi-coke is obtained for chemical chain combustion to obtain heat in the semi-coke, and generated CO2 is partially returned to the co-gasification activation step for recycling. According to the method, various coal chemical technologies such as pyrolysis, gasification, fluegas desulfurization and chemical chain combustion are integrated, secondary energy and various chemical products are obtained, efficient grading and resource utilization of the lignite are achieved, the carbon discharge amount in the utilization process of the lignite are decreased, and effective utilization of the calcium ions in the mine wastewater is achieved.

Description

technical field [0001] The invention belongs to the technical field of energy industry optimization and energy saving and emission reduction, and relates to a lignite utilization method, in particular to a comprehensive utilization method of efficient graded resource utilization of lignite. Background technique [0002] my country is rich in lignite resources, which are mainly concentrated in North China, mostly in Inner Mongolia. The proven resources are 190.3 billion tons, accounting for 41.18% of the country's predicted coal resources, and occupy an important position in my country's coal resources. With the increasing depletion of high-rank coal, the status of lignite in the field of energy utilization has been significantly improved. Lignite has high volatile content, good gasification reactivity, and low mining cost. However, its high water content and low calorific value make its utilization rate as an energy source low. Therefore, finding a method for efficient res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/04C10G1/00C10J3/60
CPCC10B53/04C10G1/00C10J3/60
Inventor 廖俊杰韩艳娜冯国瑞常丽萍鲍卫仁
Owner TAIYUAN UNIV OF TECH
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