catalogue
Brief introduction of coking coal
Coking coal resources
Distribution of coking coal?
Types of cola
Basic knowledge of calcium carbide coke
Basic knowledge of ferroalloy coke
Requirements for coke in ferrosilicon alloy production
Coke quality index
Experimental method of coke tower Brief introduction of coking coal
Coking coal resources
Distribution of coking coal?
Types of cola
Basic knowledge of calcium carbide coke
Basic knowledge of ferroalloy coke
Requirements for coke in ferrosilicon alloy production
Coke quality index
This section introduces coking coal by expanding and editing the experimental method of coke drum.
Coking coal: according to the use of coal, it is used as raw material for producing coke and then used in iron and steel industry. In addition to coking coal, it is also divided into power coal for power fuel, anthracite for chemical raw materials and injection coal for blast furnace injection in iron and steel industry. Coking coal mainly includes: lean coal, lean coal, coking coal, 1/3 coking coal, fat coal, gas coal and gas fat coal.
Edit coking coal resources in this section.
According to the data of BP's World Energy Statistics 2007, the proven recoverable reserves of coal in the world at the end of 2006 totaled 909.064 billion tons, with a recoverable life of 147 years. According to the degree of coal metamorphism, the coking coal in the proven coal reserves is less than110 of the resources. Among the coking coal resources in the world, fat coal, main coking coal and lean coal account for about 1/2, and their economically recoverable reserves are about 500 billion tons, of which the high-quality coking coal resources with low ash and low sulfur are only about 60 billion tons. About12 of the world's coking coal resources are distributed in Asia,14 in North America and the rest14 in other parts of the world. From the perspective of coking coal reserves, China's coking coal resources account for about 25% of the world, which has comparative advantages. China has low coking coal reserves and is short of high-quality resources. China's coking coal reserves are only 275.8 billion tons, accounting for 27% of the country's proven coal resources. Among them, gas coal accounts for 13.75%, fat coal accounts for 3.53%, main coking coal accounts for 5.8 1% and lean coal accounts for 4.0 1%. Remove the parts with high ash and sulfur content, which are difficult to wash and cannot be used for coking. High-quality coking coal and fat coal resources are scarce, accounting for less than 6% and 3% of the proven coal resources reserves respectively. Compared with China's abundant coal resources, China's coking coal resources are relatively scarce, accounting for only 26.3% of China's total coal reserves, and almost no new discoveries have been made in prospecting in recent years. Among them, the gas coal reserves with poor cohesiveness and suitable for coal blending account for nearly half, while the main coking coal and fat coal with strong cohesiveness only account for 3.53% and 5.8 1% of the total coal reserves, that is to say, the main coal blending varieties of main coking coal and fat coal only account for about 36% of the total coal reserves.
Edit coking coal distribution in this section?
80% of coking coal resources within 1000 meters in China are distributed in Shanxi and Guizhou. Shanxi's proven coking coal reserves are 65.438+06.946 billion tons, accounting for 665.438+0.4% of the national proven coking coal reserves; The recoverable reserves of coking coal in Shanxi Province are 3.31.60 billion tons, accounting for 5 1.3% of the national recoverable reserves. The recoverable reserves and proven resource reserves of coking coal in Shanxi Province rank first in China. The second, third, fourth and fifth places in China are 23.62 billion tons in Anhui Province, 65.438+0.727 billion tons in Shandong Province, 9.86 billion tons in Guizhou Province and 9.82 billion tons in Heilongjiang Province.
Edit this paragraph? Types of cola
Metallurgical coke is the general name of blast furnace coke, casting coke, ferroalloy coke and coke for smelting non-ferrous metals. Because more than 90% metallurgical coke is used in blast furnace ironmaking, blast furnace coke is often called metallurgical coke. China metallurgical coke quality standard (GB/T 1996-94) is the quality standard of blast furnace. Gasification coke is a kind of coke specially used for producing gas. It is mainly used in fixed bed gas producer with solid slag discharge, as gasification raw material, to produce gas with carbon monoxide and H2 as combustible components. The main reactions in the gasification process are: c+O2 → CO2+408177kj CO2+c → 2co-162142kj c+H2O → co+H2-1kloc-0/8628kj c. Gasified coke requires low ash content, high ash melting point, suitable and uniform molding. Its general requirements are as follows: fixed carbon >; 80%; Ash1250℃; unstable
Edit the basic knowledge of this section of calcium carbide coke.
Calcium carbide uses coke as electrical conductor, which is heated in electric arc furnace to produce calcium carbide. Coke for calcium carbide is added into an electric arc furnace, and under the action of high temperature of arc heat and resistance heat (1800-2200℃), it reacts with limestone to produce molten calcium carbide (calcium carbide). The formation process can be expressed by the following reaction formula: CaO+3C→CaC2+CO-46.52KJ coke for calcium carbide should have the characteristics of low ash content, high reactivity, high resistivity and moderate particle size, and powder and moisture should be removed as much as possible. Its chemical composition and particle size should generally meet the following requirements: fixed carbon is more than 84%, ash is less than 65438 04%, volatile matter is less than 2%, sulfur is less than 65438 0.5%, phosphorus is less than 0.04%, and moisture is less than 65438 0.0%. Particle size depends on the capacity of electric arc furnace for producing calcium carbide: electric arc furnace capacity /KV? Particle size/mm
Edit this basic knowledge of ferroalloy coke.
Ferroalloy coke is used for smelting ferroalloy in submerged arc furnace. Ferroalloy coke, as a solid reducing agent, participates in the reduction reaction in submerged arc furnace, and the reaction mainly occurs in the high temperature zone in the middle and lower part of the furnace. Taking ferroalloy smelting as an example, the reaction formula is SiO2 _ 2 (liquid) +2C (solid) =Si (liquid) +2C (gas). With the progress of the reaction, the fixed carbon in coke is continuously consumed, mainly escaping from the top of the furnace in the form of CO. Some or most of the alumina, iron oxide, calcium oxide, magnesium oxide and phosphorus pentoxide in coke ash are reduced into the alloy. The part that did not participate in the reaction entered the slag. Sulfur and silicon in coke generate silicon sulfide and silicon disulfide, and then volatilize. Different kinds of ferroalloy smelting have different requirements for coke quality, and the highest quality is required when producing ferrosilicon alloy, so the ferroalloy coke produced by ferrosilicon alloy can generally meet the requirements of other ferroalloys.
In this section, the requirements for coke in ferrosilicon production are edited.
High fixed carbon content, low ash content, less harmful substances such as alumina and phosphorus pentoxide in ash, good coke reactivity, high coke resistivity, especially high temperature resistivity, low volatile matter, suitable strength and particle size, and small and stable water content. The metallurgical standard of China (YB/T034-92) stipulates the technical requirements of ferroalloy coke, which requires the particle sizes of 2-8mm, 8-20mm and 8-25mm. Other indexes are shown in the table coke, which is a new type of coke made of pulverized coal and other raw materials by pressure forming coal and then carbonization. There are many types of briquette coke, which can be divided into lignite briquette coke and anthracite briquette coke according to the raw materials used. According to the preparation process, it can be divided into cold pressed coke and hot pressed coke. According to the purpose, it can be divided into blast furnace coke and casting coke.
Edit the quality index of coke in this section.
[Coke quality index] Coke is a solid product of high-temperature dry distillation. Its main component is carbon, and it is a porous structure with cracks and irregularities. The number of cracks directly affects the strength and compressive strength of coke, and its index is generally measured by crack degree (referring to the length of cracks in unit volume coke). Porosity is the main indicator to measure the pore structure (only the percentage of coke pore volume to the total volume), which affects the reactivity and strength of coke. Different uses of coke require different porosity indexes, such as metallurgical coke 40-45%, casting coke 35-40% and export coke 30%. The cracking degree and porosity of coke are directly related to coking coal. For example, coke made of gas coal has many cracks, high porosity and low strength. However, coke made from coking coal has less cracks, low porosity and high strength. Coke strength is usually expressed by two indicators: crushing strength and wear resistance. The crushing strength of coke refers to the ability of coke to resist external impact without crushing along cracks or defects in the structure, which is expressed by M40 value; The wear strength of coke refers to the ability of coke to resist external friction without producing surface glass to form chips or powder, which is expressed by the value of M 10. The crack degree of coke affects its crushing strength M40, and the pore structure of coke affects its wear resistance M 10. There are many methods to select M40 and M 10, and the method of German Migon drum test is mostly used in China. As shown in table 3 1- 1. After the conversion test is completed, the sieve with the aperture of 40mm and 10mm is used for screening. The particle size percentage greater than 40mm is M40 value, and the particle size percentage less than 10mm is M 10 value. See table 3 1-2 for strength index of metallurgical coke in China.
Edit the experimental method of coke drum in this paragraph.
Drum characteristics Coke sample screening strength index diameter/length (mm) rotating speed (rpm) rotating speed (rpm) weight (kg) particle size (mm) porous sieve hole (mm) wear resistance (particle pole mm/ index) crushing strength (particle pole mm/ index)1000/1000 25 -2 China metallurgical coke strength index (%) Strength index Grade I metallurgical coke Grade II metallurgical coke Grade III metallurgy 76.0 > 72.0m10 < 8.0 & lt9.0 & lt 10.0 Table 3 1-3 National Standard for Ash (Ad) of Metallurgical Coke and Clean Coal China, the United States, the former Soviet Union, Germany, France, Japan, Grade I, Grade II and Grade III Coke (%) ≤12.0 ≤13.5 ≤/kloc-.