The coal quality of Juye coalfield is analyzed in detail from the aspects of industry, elements and technological properties, and according to its coal quality characteristics, Juye coalfield is obtained through scientific demonstration.
It is the conclusion of high-quality power coal and coking coal, and can be used to prepare coal water slurry, coal gasification and synthetic ammonia, methanol synthesis and subsequent products and coking raw materials.
[Keywords:] coal quality analysis; Coal quality characteristics; Scientific utilization; evaluate
1 coal quality analysis of Juye coalfield
1. 1 industrial analysis of coal
Industrial analysis is the most basic method to determine the composition of coal. Within the index
Ash can approximately represent minerals, volatiles and fixed carbon in coal.
It can approximately represent the organic matter in coal.
The performance indexes of coal ash mainly include ash and ash grouping.
Coal ash fusibility (DT, ST, HT and FT). Wherein that fusibility of the coal ash is
Important performance indexes of thermal coal and gasified coal. Generally speaking, coal ash is soft.
Melting temperature (namely ash melting point ST) is used as an index to measure the fusibility of coal ash.
1. 1. 1 The industrial analysis results of the drilled coal samples in Gulong Mine (table 1) show that the deformation temperature (DT) is that the tip of the coal ash cone begins to bend or become round.
When the temperature; Softening temperature (ST) is the temperature at which the coal ash cone bends towards the cone tip.
The temperature at which it contacts the bottom plate and becomes spherical; Hemispheric temperature (HT) is a gray cone.
The temperature when it becomes approximately hemispherical, that is, the height is about half of the bottom length;
The flow temperature (FT) is that the coal ash cone completely melts and expands to a height of < <1.5 mm.
Thin layer temperature.
Industrial analysis results of Pengzhuang Coal Mine 1. 1.2 borehole coal sample (Table 2)
2 coal characteristics and scientific utilization evaluation
2. 1 Juye coalfield coal quality characteristics
Characteristics of Coal Quality and Vegetable Processing in Juye Mining Area of China Coal Research Institute
Evaluation of industrial utilization mode "In May 2003, we can see that the coal quality of Juye coalfield is
The following characteristics: ① Low ash content, belonging to middle and low ash coal seam. ② Volatilization
High content, the volatile content of raw coal in each coal seam is above 33%, and
There is little difference, and they all belong to high volatile coal. ③ The phosphorus content is extremely low; sulfur content
The content is low and high. ④ Low calorific value of dry basis is high. Each layer of coal exceeds
It increases with the decrease of ash content of raw coal. ⑤ Adhesion index and colloid
The layer thickness and tar yield are high. ⑥ High carbon and hydrogen content. carbon content
Between 86.02% and 86.5 1%, the hydrogen content is between 5.4 1% and 5.44%.
, C/H ratio < 16. ⑦ The melting point of ash is high or low.
2.2 Experimental evaluation of slurryability
In June, 2008, 5438+ 10, East China University of Science and Technology investigated the Gulong mine in Juye coalfield.
The slurryability of raw coal from (1#), Zhaolou Mine (2#) and Pengzhuang Mine (3#) was tested.
And evaluation.
2.2. 1 slurry concentration experiment
The slurry concentration means that the shear rate is 100 s- 1 and the viscosity is
1000 MPa s, the concentration that coal water slurry can reach. A bimodal preparation is adopted.
The mas ratio of coarse particles to fine particle is 3: 7; Humic acid salt is selected as
As an additive, the dosage is 65438 0% of the mass of pulverized coal. Made into a series of concentrations
The fluidity of coal water slurry was measured and the apparent viscosity of coal water slurry was observed.
See table 10 for the change law of pulp concentration rise. It can be seen from table 10 that the apparent viscosity of coal slurry increases with the increase of coal slurry concentration.
It has also increased significantly. In this experiment, the slurry concentrations of three coal samples are all Gulong mine.
66%(wt)； Zhaolou Mine 67% (wt); Pengzhuang Mine 68%(wt).
Rheological experiment
The rheological characteristics of coal water slurry refer to the flow and change under the action of external force.
Characteristics of form. Good rheology and fluidity are very important for coal water slurry gasification.
One of the main indicators.
The experimental coal is made into coal water slurry with appropriate concentration and then used.
The viscosity was determined by NXS-4 C coal water slurry viscometer. Table for putting coal water slurry
According to the law of apparent viscosity changing with shear, the curve is drawn to observe the viscosity of coal water slurry.
See table 1 1 for rheological properties.
From the table 1 1, it can be seen that in the coal water slurry made of three kinds of coal, it is used
With the increase of shear rate, the apparent viscosity decreases to some extent.
The yield pseudoplasticity of. Yield pseudoplasticity is beneficial to the storage of gasified coal water slurry
Storage, pumping and atomization.
2.2.3 Experimental conclusion
Coarse particle size (40 ~ 200 mesh) and fine particle size (< 200 mesh) of pulverized coal.
The ratio is 3∶7, humic acid salt is used as additive, and the addition amount is coal powder.
When the dosage is 1%, the coal slurry concentration of Gulong Mine is 66% (wt), and that of Zhaolou Mine is 66%(wt).
The concentration is 67%(wt), and the concentration of Pengzhuang coal slurry is 68%(wt), which meets the requirements of addition.
Requirements of coal water slurry gasification technology in compressed air bed for coal water slurry concentration.
2.3 Application of raw coal
2.3. 1 Suitable for preparing coal water slurry.
Coal water slurry is not only the first choice for replacing heavy oil with coal, but also an additive.
Coal water slurry gasification in compressed air bed is an important raw material for synthesis gas. At the same time, it
It is also a promising clean industrial fuel. In practice, East China Theory
The experimental evaluation report of raw coal slurryability in Juye coalfield of China University of Technology shows that: Giant
Raw coal from various mines in wild coalfield is suitable for preparing high-concentration stable coal water slurry.
Flesh.
2.3.2 Used for coal gasification and ammonia synthesis, methanol synthesis and subsequent products.
The raw coal in Juye coalfield belongs to high calorific value coal (average tube heat)
The value is between 28 ~ 3 1 mj/kg), which is beneficial to reduce oxygen and energy consumption and improve gasification yield; Because ash has a high melting point
(> 65438 0300℃), which is beneficial to solid slag discharge. According to Angang and WISCO
Don't use Shuangyashan and Heping Xiangshan 1/3 coking coal as the experience of blast furnace injection.
Juye coalfield 1/3 coking coal, Shuangyashan, Pingdingshan 1/3 coking coal.
The sample has good slurryability, and its 1/3 coking coal can be used to prepare coal water slurry.
Used as raw material for blast furnace injection of Texaco coal water slurry gasifier.
The synthesis gas obtained from coal gasification can be used for synthesis through conversion.
Ammonia/urea can also be purified and desulfurized to synthesize methanol or dimethyl ether. the whole family
Based on alcohol, about 120 other chemical products can be further synthesized. in addition
In addition, methanol can also be used to prepare alcohol ether fuel and synthesize liquid hydrocarbon fuel.
Wait a minute.
2.3.3 Used as coking raw material.
Coking is used to produce metallurgical coke and chemical coke, and its by-product is coke oven gas.
It can be used to synthesize methanol or synthetic ammonia, and the by-product coal tar can be separated and deepened.
A series of chemical raw materials and products can be obtained after processing. As can be seen from the table 12, the large trough coal in Juye coalfield can be washed.
Future 4 million t/a coking plant or Shanghai Baosteel and other large-scale enterprises.
Iron and steel enterprises use coal blending for coking when producing grade I coke; ash
Small and medium-sized cokes in East China can also use 8-grade clean coal (2#) ≤9.0%.
Coking with coal blending for producing grade 2 and grade 3 metallurgical coke in chemical enterprises. this
In addition, coal can also be used for coking alone, but the porosity of coke produced is on the side.
High, it is best to blend coal for coking. 2.3.4 Vision-Coal to Oil
Direct liquefaction of coal can produce gasoline, kerosene and other products. Juye
Most coal seams in the coalfield are oil-rich coal, especially the average 15 coal seam.
The tar yield is > 12%, which belongs to high oil coal. Hydrocarbons calculated by elemental analysis
Less than16% of all coal seams; Most of the coal seam volatile > 35% gas coal and
After gas-fertilizer coal preparation, the volatile matter of clean coal is more than 37%, while the ash
< 10%。 Therefore, the coal in Juye coalfield is a good liquefied raw material.
Coal.
Liquid hydrocarbons can be produced by indirect liquefaction of coal. Coal is synthesized after gasification.
Gases can be produced by Fischer-Tropsch synthesis to produce liquid hydrocarbons such as gasoline, diesel oil,
Paraffin wax and other chemical products and chemical raw materials.
3 Conclusion
To sum up, Juye coalfield No.3 coal seam big slot coal belongs to low ash,
Coal with low sulfur and phosphorus, good coking, high volatile matter and high calorific value.
Sources include gas coal, 1/3 coking coal, gas fat coal, fat coal, natural coke, etc.
Domestic coal is in short supply, and their clean coal can be used not only for coking.
Coal, power coal, coal water slurry and blast furnace blowing can also be prepared.
Important raw materials. Therefore, Heze vigorously develops coal gasification to synthesize ammonia and methanol.
It is an inevitable and correct choice to lengthen the industrial chain and engage in deep processing.