CN107163992B - Auxiliary agent for improving viscosity-temperature characteristics of coal ash slag and application thereof - Google Patents

Auxiliary agent for improving viscosity-temperature characteristics of coal ash slag and application thereof Download PDF

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Publication number
CN107163992B
CN107163992B CN201710388890.1A CN201710388890A CN107163992B CN 107163992 B CN107163992 B CN 107163992B CN 201710388890 A CN201710388890 A CN 201710388890A CN 107163992 B CN107163992 B CN 107163992B
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coal
viscosity
ash
auxiliary agent
slag
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CN107163992A (en
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白进
李怀柱
孔令学
郭振兴
尉迟唯
白宗庆
李文
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Shanxi Institute of Coal Chemistry of CAS
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Shanxi Institute of Coal Chemistry of CAS
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/48—Apparatus; Plants
    • C10J3/52—Ash-removing devices
    • C10J3/526—Ash-removing devices for entrained flow gasifiers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0903—Feed preparation
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/093—Coal
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0983—Additives

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

An assistant for improving the viscosity-temperature characteristics of coal ash slag is coal gangue, and the composition and content of the coal gangue are SiO in percentage by mass266.91～74.35%，Al2O318.09～21.53%,Fe2O3≤1.50%,CaO≤0.50%,MgO≤1.20%,SO3≤0.5%,K2O is less than or equal to 3 percent. The auxiliary agent is crushed and ground to be less than 0.18mm, and is added into coal of Yibei coal field of Xinjiang according to the proportion of 3.09-5.26 wt% based on coal, and the mixture is uniformly mixed to be used as raw material coal of a pulverized coal gasification furnace. The invention can effectively improve the viscosity-temperature characteristic of coal ash in Yibei coal field of Xinjiang, so that the coal ash can meet the requirement of dry pulverized coal gasification liquid-state slag discharge, not only widens the application range of coal in the area, but also takes the coal gangue as the raw material, has low price and realizes reasonable utilization of resources.

Description

Auxiliary agent for improving viscosity-temperature characteristics of coal ash slag and application thereof
Technical Field
The invention belongs to an auxiliary agent for improving the viscosity-temperature characteristic of coal ash slag and application thereof.
Background
The coal gasification technology is the basis of the development of the modern coal chemical industry and is a feasible way for realizing the clean and efficient utilization of coal resources. Among them, entrained-flow gasification has become a trend of gasification technology development in recent years due to its characteristics of wide coal type application range, high carbon conversion rate, and the like. Entrained flow gasification has two different types depending on the feed mode: the coal water slurry gasification and the dry powder coal gasification, the coal water slurry gasification considers the loss of water vapor at high temperature and the corrosion to refractory bricks, the operation temperature is not too high, and is generally controlled to be about 1350 ℃. The dry powder coal gasification adopts a 'slag-resistant' water-cooled wall technology, a slag layer with proper thickness is formed on the lining of the furnace wall, the corrosion of molten slag can be resisted, and the operating temperature is usually controlled at 1300-1600 ℃.
Coal ash and slag are discharged from the bottom of the gasification furnace in a liquid state at high temperature of dry pulverized coal gasification, and whether the liquid state slag discharge is smooth or not is a key factor for determining the long-period stable operation of the gasification furnace. The slag is discharged in a liquid state, the problem of slag blockage caused by unsmooth flow of liquid ash slag needs to be prevented in the operation process, the viscosity temperature characteristic of coal ash slag determines the window temperature of the operation of the entrained flow gasifier, the slag hanging thickness suitable for a water cooling wall and the slag discharging performance, and the slag discharging method has very important significance for ensuring the normal and stable operation of the gasifier. Taking a shell gasification furnace as an example, the high-temperature viscosity of the coal ash needs to be controlled to be 2.5-25 Pa.s, the ash slag cannot be smoothly hung due to low viscosity, and the slag is easily blocked due to high viscosity.
Coal reserves in China are abundant, property differences are large, only a few coals are suitable for the slag tapping gasifier, most raw material coals cannot directly meet the requirement of slag tapping, regulation and control are needed through coal blending or addition of an auxiliary agent, and a regulation and control method for mastering the viscosity-temperature characteristic of coal ash is urgent for more reasonably and economically applying the coal resources in China to the slag tapping gasifier. In some areas, due to the fact that the coal ash contains less alkaline components, the coal ash has high ash viscosity and is easy to block slag, and a large number of researches prove that the viscosity-temperature characteristic of the coal ash can be improved by adding single-component fluxing agents such as calcium-based fluxing agents, iron-based fluxing agents, magnesium-based fluxing agents, sodium-based fluxing agents and the like or multi-component composite fluxing agents such as minerals such as limestone, illite and the like or analyzing pure chemical substances. Coal in Yibei coal field of Xinjiang has low silicon-aluminum content, high calcium-iron-magnesium-sulfur content, low ash viscosity at high temperature, and sensitive viscosity change along with temperature change, is easy to cause slag blockage, and has serious erosion to refractory materials, thus becoming a difficult problem which puzzles the application of coal in the area.
Disclosure of Invention
The invention aims to provide an auxiliary agent for improving the viscosity-temperature characteristic of pulverized coal gasification coal ash slag, which can effectively improve the viscosity-temperature characteristic of coal ash slag in Yibei coal field of Xinjiang and enable the coal ash slag to meet the requirement of liquid-state slag discharge.
In order to achieve the purpose, the technical scheme adopted by the scheme is as follows:
an auxiliary agent for improving the viscosity-temperature characteristic of coal ash, which is characterized in that the auxiliary agent is coal gangue, and the composition and the content of the coal gangue are SiO in percentage by mass2 66.91～74.35％，Al2O3 18.09～21.53％,Fe2O3≤1.50％,CaO≤0.50％,MgO≤1.20％,SO3≤0.5％,K2O≤3％。
The application steps are as follows: the auxiliary agent is crushed and ground to be less than 0.18mm, and is added into coal of Yibei coal field of Xinjiang according to the proportion of 3.09-5.26 wt% based on coal, and the mixture is uniformly mixed to be used as raw material coal of a pulverized coal gasification furnace.
The coal ash of Yibei coal field is characterized by low silicon aluminum high calcium iron magnesium composition, single-component and multi-component compound additives such as calcium base, iron base, magnesium base and the like are added, the problem in the slag tapping process is difficult to solve, the coal gangue additives with proper high silicon aluminum and high silicon aluminum ratio are added, the problem that the viscosity of the ash changes sensitively along with the temperature change is solved, meanwhile, the ash type is changed from crystalline slag to vitreous slag, the slag tapping temperature range is widened, and the selectable range of the gasifier operation temperature is enlarged.
When the addition proportion of the auxiliary agent is less than 3.09 wt%, the content of silicon and aluminum in the ash is low, the viscosity of the ash at high temperature is low, and the temperature of liquid-state slag discharge is low, which is not in accordance with the requirement that the temperature of dry powder coal gasification is high and is usually controlled at 1300-1600 ℃. When the addition proportion of the auxiliary agent is more than 5.26wt%, the silicon and aluminum content in the ash is high, the viscosity of the ash is high at high temperature, the ash type is likely to be changed into crystal slag again, and the addition amount is too large, so that resource waste and a large amount of heat loss are easily caused. The adding proportion is controlled to be 3.09-5.26 wt%, the content of silicon and aluminum in ash is proper, the ash is glass slag, the liquid-state slag discharging temperature range is wide, and the requirement of dry pulverized coal gasification operation temperature is met.
The invention has the advantages that: the coal gangue is used as an auxiliary agent, 3.09-5.26 wt% (coal base) of the auxiliary agent is added, so that the viscosity-temperature characteristic of coal ash residue in Yibei Xinjiang can be obviously improved, the coal ash residue is smoothly discharged in a liquid state, reasonable utilization of resources is realized by using the coal gangue as the auxiliary agent, and the coal variety applicability of the liquid-state slagging gasification technology is widened.
Drawings
FIG. 1 is a graph showing the viscosity-temperature characteristics of example 1. The dotted line is the viscosity-temperature characteristic curve of the coal ash without the addition of the additive A, and the solid line is the viscosity-temperature characteristic curve of the coal ash after the addition of the additive A.
FIG. 2 is a graph showing the viscosity-temperature characteristics of fly ash in examples 2 and 3. The dotted line is the viscosity-temperature characteristic curve of the fly ash without the addition of the additive B, the solid line 1 is the viscosity-temperature characteristic curve of the fly ash B after the addition of 3.09% of the additive in example 2, and the solid line 2 is the viscosity-temperature characteristic curve of the fly ash B after the addition of 5.26% of the additive in example 3.
Detailed Description
The invention is further illustrated, but not limited, by the following detailed description.
Example 1: the mass percent of the mixture is SiO2 74.35％，Al2O3 18.09％,Fe2O3 0.84％,CaO 0.15％,MgO 1.20％,SO3 0.06％,K2The coal gangue additive of O2.21 percent is added into coal A of coal field of Yibei coal of Xinjiang according to the proportion of 5.26 percent by weight (coal base), and is uniformly mixed, and the ash viscosity of the raw coal and the coal sample added with the additive is respectively measured according to the standard GB/T31424 and 2015 coal ash viscosity measuring method.
The result shown in fig. 1 shows that the addition of the additive into the coal a obviously improves the viscosity-temperature characteristic of coal ash at high temperature, the type of the ash at high temperature is changed from crystalline slag to vitreous slag, the temperature range corresponding to the ash viscosity of 2.5-25 Pa · s is changed from 1330-1412 ℃ to 1310-1526 ℃, the slag discharging temperature range is widened, and the problem that the stable operation of liquid slag discharging is influenced due to the sensitivity of the change of the ash viscosity along with the change of the temperature is solved.
Example 2: the mass percent of the mixture is SiO2 66.91％，Al2O3 21.53％,Fe2O31.50％,CaO 0.50％,MgO 0.64％,SO3 0.50％,K2Adding 3.00 percent of coal gangue auxiliary agent into coal B of coal field in Yibei Xinjiang according to the proportion of 3.09 percent by weight (coal base), uniformly mixing, and respectively measuring the ash viscosity of the raw coal and the coal sample added with the auxiliary agent according to the GB/T31424-containing 2015 coal ash viscosity measuring method. The result shows that the addition of 3.09% (coal-based) additive into the coal B obviously improves the viscosity-temperature characteristic of coal ash at high temperature, the ash type at high temperature is changed from crystallization slag into vitreous slag, and the temperature corresponding to the viscosity of 2.5-25 Pa.s is 1244-1445 ℃.
Example 3: the mass percent of the mixture is SiO2 66.91％，Al2O3 21.53％,Fe2O31.50％,CaO 0.50％,MgO 0.64％,SO3 0.50％,K2Adding an O3.00% coal gangue auxiliary agent into coal B of coal field in Yibei Xinjiang according to the proportion of 5.26wt% (coal base), uniformly mixing, and measuring the ash viscosity of the coal sample added with the auxiliary agent according to the standard GB/T31424-containing 2015 coal ash viscosity measuring method. The result shows that 5.26 percent (coal-based) additive is added into the coal B, the ash type at high temperature is vitreous slag, the temperature corresponding to the viscosity of 2.5-25 Pa.s is 1343 ℃>1569℃。
As shown in the result of figure 2, the addition of 3.09% and 5.26% of the additive into the coal B obviously improves the viscosity-temperature characteristics of the coal ash at high temperature, the type of the coal ash at high temperature is changed from crystalline slag to vitreous slag, and the viscosity of the coal ash at high temperature is increased along with the increase of the addition proportion. Considering that the operation temperature of the dry pulverized coal entrained flow gasifier is usually controlled within 1300-1600 ℃, the addition ratio of the auxiliary agent is controlled within 3.09-5.26%, and the auxiliary agent is not too high or too low.
The composition (wt%) of the coal ash used in Xinjiang Yibei coal field A, B is shown in Table 1.
TABLE 1 coal ash composition (wt%) of Yibei coal field A, B Xinjiang

Claims (2)

1. An auxiliary agent for improving the viscosity-temperature characteristic of coal ash slag is characterized in that the auxiliary agent is coal gangue; the auxiliary agent is used in the dry powder entrained flow gasification process; the coal gangue comprises SiO in percentage by mass2 66.91～74.35%，Al2O318.09～21.53%，Fe2O3 ≤1.50%，CaO ≤0.50%，MgO ≤1.20%，SO3 ≤0.5%，K2O is less than or equal to 3 percent; the coal is coal in Yibei coal field of Xinjiang.
2. The use of an additive according to claim 1 for improving the viscosity-temperature characteristics of coal ash slag, comprising the steps of: crushing and grinding the auxiliary agent to be less than 0.18mm, adding the auxiliary agent into coal of Yibei coal field of Xinjiang according to the proportion of 3.09-5.26 wt% based on coal, and uniformly mixing to obtain raw material coal of a dry powder entrained flow coal gasifier.
CN201710388890.1A 2017-05-26 2017-05-26 Auxiliary agent for improving viscosity-temperature characteristics of coal ash slag and application thereof Active CN107163992B (en)

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CN108219893A (en) * 2018-03-14 2018-06-29 彭岩 A kind of auxiliary agent and its application method for improving coal ash melting temperature
CN109576036A (en) * 2018-10-19 2019-04-05 安徽理工大学 A kind of auxiliary agent and preparation method improving gasified pulverized coal slag viscosity-temperature characteristics
CN112094675A (en) * 2020-09-07 2020-12-18 北京京能能源技术研究有限责任公司 Method for adjusting viscosity-temperature characteristics of mixed coal and coal in Taran Gaylor mining area and coal gasification method

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CN101250453A (en) * 2008-04-01 2008-08-27 本溪市鹤腾铁塑制品厂 Composite solid fuel
KR20130022140A (en) * 2011-08-25 2013-03-06 이강선 Approaches to the utilization of gangue and producer with gangue as fuel
CN103992820B (en) * 2014-05-16 2017-01-11 新奥科技发展有限公司 Comprehensive utilization method of coal gangue

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