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An additive for improving the viscosity-temperature characteristics of coal ash slag and its application

A technology of additives and slag, applied in the direction of manufacturing combustible gas, gasification process, granular/powdered fuel gasification, etc., can solve the problems of low silicon-aluminum content, erosion, low ash viscosity, etc., and broaden the application of coal types performance, realize reasonable utilization, and improve the effect of viscosity-temperature characteristics

Active Publication Date: 2019-12-27
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

Due to the low content of silicon, aluminum and high content of calcium, iron, magnesium and sulfur in the ash chemical composition of Xinjiang Yibei Coalfield, the ash has a low viscosity at high temperature and is sensitive to changes in viscosity with temperature, which is easy to cause slag plugging and serious erosion of refractory materials. Problems Plaguing Coal Application in the Region

Method used

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  • An additive for improving the viscosity-temperature characteristics of coal ash slag and its application
  • An additive for improving the viscosity-temperature characteristics of coal ash slag and its application
  • An additive for improving the viscosity-temperature characteristics of coal ash slag and its application

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Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1: containing SiO by mass percent 2 74.35%, Al 2 o 3 18.09%, Fe 2 o 3 0.84%, CaO0.15%, MgO1.20%, SO 3 0.06%, K 2 O 2.21% coal gangue additive, added in the ratio of 5.26wt% (coal base) to coal A in Yibei Coalfield, Xinjiang, mixed evenly, according to the standard "GB / T 31424-2015 Coal Ash Viscosity Determination Method", respectively measure the raw coal Ash viscosity of coal samples with additives.

[0016] figure 1 From the results shown, it can be seen that the addition of additives to coal A significantly improved the viscosity-temperature characteristics of coal ash at high temperatures. The temperature range is changed from 1330-1412°C to 1310-1526°C, which not only broadens the temperature range of slag discharge, but also solves the problem that the viscosity of ash slag is sensitive to changes with temperature and affects the stable operation of liquid slag discharge.

Embodiment 2

[0017] Embodiment 2: containing SiO by mass percent 2 66.91%, Al 2 o 3 21.53%, Fe 2 o 3 1.50%, CaO0.50%, MgO0.64%, SO 3 0.50%, K 2 O 3.00% coal gangue additive, added in the ratio of 3.09wt% (coal base) to the coal B coal of Yibei coalfield in Xinjiang, mixed evenly, according to the standard "GB / T 31424-2015 Coal Ash Viscosity Determination Method", respectively measure the raw coal Ash viscosity of coal samples with additives. The results show that the addition of 3.09% (coal-based) additives to B coal significantly improves the viscosity-temperature characteristics of coal ash at high temperatures. The temperature is 1244-1445°C.

Embodiment 3

[0018] Embodiment 3: containing SiO by mass percent 2 66.91%, Al 2 o 3 21.53%, Fe 2 o 3 1.50%, CaO0.50%, MgO0.64%, SO 3 0.50%, K 2 O 3.00% coal gangue additive, added in the ratio of 5.26wt% (coal base) in the coal B coal of Yibei coalfield in Xinjiang, mixed evenly, according to the standard "GB / T 31424-2015 Coal Ash Viscosity Determination Method", measure the additive The ash viscosity of the agent coal sample. The results show that when 5.26% (coal-based) additives are added to B coal, the ash type is vitreous slag at high temperature, and the temperature corresponding to the viscosity of 2.5-25Pa·s is 1343->1569°C.

[0019] figure 2 From the results shown, it can be seen that the addition of 3.09% and 5.26% additives to B coal significantly improved the viscosity-temperature characteristics of coal ash at high temperature, and the type of ash at high temperature changed from crystalline slag to vitreous slag. With the increase of the ratio, the viscosity of co...

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Abstract

The invention discloses an assistant capable of improving the viscosity-temperature characteristics of coal ash slag. The assistant is prepared from the following components in percentages by weight: 66.91-74.35% of SiO2, 18.09-21.53% of Al2O3, not more than 1.50% of Fe2O3, not more than 0.50% of CaO, not more than 1.20% of MgO, not more than 0.5% of SO3, not more than 3% of K2O and coal gangue. The assistant is crushed and ground until smaller than 0.18mm; on the basis of coal, the assistant is added to coal of the Xinjiang Yibei coal field at the ratio of 3.09-5.26wt%, and is mixed evenly as feed coal of a powdered coal gasifier. The assistant has the advantages that the viscosity-temperature characteristics of the coal ash slag of the Xinjiang Yibei coal field can be effectively improved to meet the requirements of gasified liquid slagging of dried coal powder; the application range of the coal of the area is expanded; and by adopting the coal gangue as the raw material, the price is low and reasonable utilization of resources is achieved.

Description

technical field [0001] The invention belongs to an additive for improving the viscosity-temperature characteristics of coal ash slag and its application. Background technique [0002] Coal gasification technology is the basis for the development of modern coal chemical industry and a feasible way to realize clean and efficient utilization of coal resources. Among them, entrained bed gasification has become the development trend of gasification technology in recent years because of its wide range of coal types and high carbon conversion rate. Entrained bed gasification has two different types according to the feeding method: coal water slurry gasification and dry pulverized coal gasification. Coal water slurry gasification considers the loss of water vapor at high temperature and the corrosion of refractory bricks, and the operating temperature should not be too high , usually controlled at around 1350°C. In dry pulverized coal gasification, due to the water-cooled wall tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/52C10J3/72
CPCC10J3/526C10J3/72C10J2300/0903C10J2300/093C10J2300/0983
Inventor 白进李怀柱孔令学郭振兴尉迟唯白宗庆李文
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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