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Low activity dust coal catalytic gasifying method

A technology for pulverized coal and inorganic minerals is applied in the field of harmless calcination of alkaline ash and slag, which can solve the problems of unapplied value, uneven distribution of coal mines, and restrict the sustainable development of lump coal mining, so as to increase the gasification reaction. rate and gas yield, ensuring continuous circulation and stable operation, high-efficiency gasification and the effect of residue conversion

Inactive Publication Date: 2006-12-06
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

3 / 4 of my country's energy comes from coal, which is rich in coal reserves and ranks third in the world. Due to factors such as uneven distribution of coal mines, large price differences between regions, varying quality of coal, and limited mining of lump coal, it is seriously restricted to use coal as the source The sustainable development of various industries such as steel, fertilizer, cement, ceramics, glass, and building materials; taking the coal reserves of Fujian Province as an example, more than 98% of them are low volatile (V ad 950°C), poor combustibility, strong pulverization and low activity anthracite, adopts conventional high temperature (>1000°C) fluidized bed pulverized coal gasification technology, low gas yield (3 / kg·coal), the cost of gas is high, and it has no industrial application value

Method used

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  • Low activity dust coal catalytic gasifying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Spray the industrial waste lye at normal temperature into a fujian Shangjing anthracite pulverized coal (volatile matter V ad %=2.69%, Ash A ad %=18.37%) stirred bed, in which the total volume of waste caustic soda is based on the filling amount of submerged pulverized coal, and the Na content is converted into NaOH amount accounting for 3.8% of the weight of pulverized coal, mixed and dried at 110°C for 8 hour, the mixed coal sample was obtained;

[0028] (2) The mixed coal sample enters the fluidized bed gasifier, and under the conditions of gasification temperature of 850 ° C and gasification time of 50 min, it is mixed with water vapor from the fluidized bed calciner and preheated air, and then the water vapor / air =1.4kg / m 3 And water / coal=2kg / kg for catalytic gasification, the gas yield can be obtained 3.18Nm after testing 3 / kg Coal and gas calorific value 7.07MJ / m 3 As a result, alkaline ash can be automatically discharged from the bottom or side of the g...

Embodiment 2

[0032] (1) 2% pulp black liquor at normal temperature (converted into NaOH amount to account for coal weight) and Fujian Yongding anthracite pulverized coal with a particle size of 1.0-4.0 mm (volatile content V ad %=3.56%, Ash A ad %=19.94%) for impregnation, and then dried for 4 hours in a tumble dryer at 120°C to obtain a mixed coal sample;

[0033] (2) The mixed coal sample enters the fluidized bed gasifier, and under the conditions of gasification temperature of 880 °C and gasification time of 40 min, it is mixed with water vapor from the fluidized bed calciner and preheated air, and then the water vapor / air =1.1kg / m 3 And water / coal=1.6kg / kg for catalytic gasification, the gas yield can be obtained 4.33Nm after testing 3 / kg Coal and gas calorific value 7.01MJ / m 3 As a result, alkaline ash can be automatically discharged from the bottom or side of the gasifier;

[0034] (3) The bauxite, which accounts for 2% of the alkaline ash weight, is mixed with the alkaline ash ...

Embodiment 3

[0037] (1) Spray the waste lye of viscose at normal temperature into an anthracite pulverized coal in Shangjing, Fujian with a particle size of 3.0-5.0 mm ad %=2.69%, Ash A ad %=18.37%) stirred bed, wherein the total volume of spent caustic soda is based on the submerged pulverized coal loading, and the Na content is converted to NaOH amount accounting for 5.0% of the pulverized coal weight, mixed and dried at 120 ° C for 6 hours , to prepare a mixed coal sample;

[0038] (2) The mixed coal sample enters the fluidized bed gasification furnace, and under the conditions of gasification temperature of 900 ° C and gasification time of 60 minutes, it is mixed with water vapor (water / coal = 4.5kg / kg) from the fluidized bed calciner. Catalytic gasification, after testing, the gas yield can be 3.4Nm 3 / kg Coal and gas calorific value 9.3MJ / m 3 As a result, alkaline ash can be automatically discharged from the bottom or side of the gasifier;

[0039] (3) Dolomite, which accounts fo...

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Abstract

The invention discloses a low activity dust coal catalytic gasifying method which consists of, spraying industrial alkali waste liquid to low active powered coal or coal carbonization coal coke, mixing and drying, then entering fluid bed gasification stove for catalyzed gasification with air / aqueous vapor or aqueous vapor, basic ash and slag can be automatically discharged from the bottom or lateral surface or the gasification furnace.

Description

Technical field: [0001] The invention belongs to a method for efficient catalytic gasification of anthracite pulverized coal with a volatile content of less than 7% by using an industrial waste alkali catalyst to increase the gas yield, improve the calorific value of the gas and make the alkaline ash calcined harmless. Background technique: [0002] Coal catalytic gasification is an advanced gasification method that reduces the reaction temperature, increases the reaction rate, and controls the gas composition. Since the British patent was first proposed in 1869, many scholars at home and abroad have studied the mechanism of catalytic gasification of coal, the selection of various catalysts, the optimization of catalytic gasification process conditions, and the intermediate test of catalytic gasification process (ECCG) for the production of substitute natural gas. etc. have carried out extensive research, but there are no reports on the transformation of low-activity and inf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/54C10B53/04
Inventor 张济宇林驹林诚旷戈林荣英
Owner FUZHOU UNIV
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