Method for producing clean coke based on aluminum oxide transition state binder

Abstract

The invention discloses a method for producing clean coke based on an aluminum oxide transition state binder. The method includes the steps: selecting and crushing silica, limestone and coal liquefaction residues, adding aluminum oxide, metakaolin and pregelatinized starch, uniformly stirring and mixing the materials and then performing dry grinding to obtain the aluminum oxide transition state binder; selecting blended coal, uniformly mixing the blended coal and the aluminum oxide transition state binder according to the proportion of the blended coal and the aluminum oxide transition state binder, performing cold pressing, performing dry distillation in a vertical dry distillation furnace, discharging red hot furnace charge and then cooling the red hot furnace charge to normal temperature by a coke quenching procedure to obtain the clean coke. Raw material sources are wide and rich, the cost is low, the clean coke has the functions of cold-hot state binders and functions in adhesionbefore the cold state binder loses efficacy and the hot state binder takes effect in the pyrolysis process, and the forming rate and the formed coke strength of the materials in the dry distillation furnace are ensured.

Description

technical field [0001] The present invention relates to a production method of clean coke, and also relates to a binder used in the production of clean coke, in particular to an alumina transition state binder used in the production of clean coke and its preparation method and application. Background technique [0002] The special primary energy endowment of some rich coal, poor oil and little gas determines that coal combustion is the main way to obtain energy at present and for a long time to come. serious hazards, resulting in serious air pollution and frequent occurrence of smog; for example, in 2014, China’s statistics for civilian coal consumption was 160 million tons, accounting for only 3.8% of the country’s coal consumption. Taking sulfur dioxide emissions as an example, power plants The annual emission is 2 million tons, and the civil scattered combustion is as high as 3.2 million tons, which is 1.6 times the total emission of power plants; in addition, a series o...

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Problems solved by technology

[0005] At present, there are few patents on powdered coal forming carbonization method. For example, in the publication number CN106635217A, coal liquefaction residue is directly mixed with pulverized coal for molding as its hot and cold state binder; in publication number CN106701133A, pitch and tar residue are used as Dry distillation after binder mixed with pulverized coal to obtain molded coke; Publication No. CN106753496A uses tar slag as the base binder and then supplements with cornmeal and inorganic magnesium salt and then dry distillation; Publication No. CN106929063A uses waste heavy Coal tar pitch, tar residue, polyaluminum ferric chloride are mixed and heated to soften, then dolomite powder is added to obtain a binder, and after being mixed with pulverized coal, the coal is cold-pressed and then dry-distilled to obtain molded coke. These preparations for molded coke The binder used in the patent formula is mainly used in the cold forming process below 200°C and the hot binder in the dry distillation process above 400°C, but there are 200-400°C in the actual dry distillation process. In the stage where the cold binder fails and the hot binder does not work between ℃, due to the lack of use of transition binders in this temperature range, the coke breakage rate is high during the carbonization process.

[0006] After searching, there is no report on the alumina transition state binder used in the production of clean coke

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