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Low activity dust coal catalytic gasifying method

A low-activity, pulverized coal technology, used in special forms of dry distillation, petroleum industry, coke ovens, etc., can solve problems such as unapplied value, uneven distribution of coal mines, and block coal mining at different prices, restricting sustainable development, etc. The effect of gasification reaction rate and gas yield, ensuring continuous circulation and stable operation, efficient gasification and residue conversion

Inactive Publication Date: 2005-01-26
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Spray the industrial waste lye under normal temperature into a packing particle size of 0.8-2.0 mm and Fujian Shangjing anthracite pulverized coal (volatile matter V ad %=2.69%, Ash A ad %=18.37%) stirred bed, wherein the total volume of spent caustic soda is based on the filling amount of submerged pulverized coal or carbonized coal char, and the Na content is converted into NaOH, which accounts for 3.8% of the weight of pulverized coal or carbonized coal char, at 110 Mix and dry at ℃ for 8 hours to obtain a mixed coal sample;

[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 res...

Embodiment 2

[0032] (1) 2% pulp black liquor at room temperature (converted into the amount of NaOH to account for coal weight) and Fujian Yongding anthracite powdered 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 a...

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 filling amount of submerged pulverized coal or carbonized coal char, and the Na content is converted into NaOH, which accounts for 5.0% of the weight of pulverized coal or carbonized coal char, at 120 Mix and dry at ℃ for 6 hours to obtain 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 ...

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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 kind of high-efficiency catalytic gasification of low-activity anthracite pulverized coal or dry distillation coal char 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 Methods. 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 n...

Claims

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Application Information

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IPC IPC(8): C10B53/04
Inventor 张济宇林驹林诚旷戈林荣英
Owner FUZHOU UNIV
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