Preparation method of columnar active coke for desulfurization and denitrification

Abstract

The invention discloses a preparation method of columnar active coke for desulfurization and denitrification, which comprises the following steps: S1, pretreatment: crushing raw materials until the particle size D99 of particles is less than or equal to 0.75 mm to prepare raw material powder; the raw materials comprise semi-coke and petroleum coke green coke / coal pitch green coke; s2, kneading and forming: adding a binder and water into the raw material powder for kneading and forming to obtain an active coke precursor; the weight part ratio of the raw material powder to the binder is (70-80): (20-30); s3, carbonization: drying the active coke precursor, and performing carbonization treatment to obtain a carbonized product; and S4, activating, namely activating the carbonized product by adopting a water vapor activation method to prepare the columnar active coke for desulfurization and denitrification. According to the preparation method of the columnar active coke for desulfurization and denitrification, the active coke with good quality and low cost can be prepared, and the physical and chemical properties such as bulk density, abrasive resistance, compression strength and ignition point of the active coke are improved under the condition of ensuring the desulfurization and denitrification performance of the active coke.

Description

technical field [0001] The invention relates to the field of active coke, in particular to a method for preparing columnar active coke for desulfurization and denitrification. Background technique [0002] my country is a country that uses coal as the main energy source in the world. Because coal is usually used in direct combustion, it produces a large amount of pollutants such as sulfur oxides, nitrogen oxides, and soot. These pollutants lead to acid rain, greenhouse effect and Environmental pollution such as the destruction of the ozone layer has seriously affected the living environment of human beings. [0003] Relevant studies have shown that activated coke moving bed desulfurization and denitration technology has the advantages of wide application range, high desulfurization and denitrification efficiency, low operating cost, and good environmental protection benefits. Therefore, at this stage, this technology is mainly used to treat the flue gas generated after coal c...

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Problems solved by technology

For example, application number 200910083047.8 discloses a kind of activated coke and its preparation method and application. With 6-8 parts by mass of lignite and 2-4 parts by mass of anthracite as raw materials, coal tar and catalyst are added for kneading and molding, and then the formed Activated coke is obtained by carbonization and activation treatment of the product. Although the activated coke of this application has a certain desulfurization effect, the wear resistance and ignition point of most of the activated coke prepared in the examples are lower than the national standard.

Another example is that the application number 200910083045.9 discloses a method for preparing desulfurization activated coke, using anthracite as raw material, adding coal tar, catalyst extrusion to form carbon strips, and then aging, carbonization and activation to obtain activated coke, although the activated coke The compressive strength and stack specific gravity indicators of the active coke are excellent, but anthracite is a scarce resource, which is not easy to obtain and is expensive. In addition, the saturated sulfur capacity analysis method adopted by the activated coke has no corresponding relationship with the national standard sulfur capacity measurement method. Therefore, It is impossible to judge whether the product meets the requirements of the national standard; another example is that the application number 201010124815.2 discloses a desulfurization and denitrification active coke and its preparation method, using lignite and coking coal as raw materials, adding pitch, tar, vanadium pentoxide, copper oxide and water for kneading The coal paste is obtained, and then processed by molding, drying, and carbonization activation. Although the active coke in this application has a good desulfurization and denitrification effect, the wear resistance of the active coke in the examples is relatively poor, with a maximum of only 95% , did not meet the national standard

Application number 200910300277.5 discloses a preparation method of columnar active coke. The bulk density and compressive strength of the columnar active coke prepared by this application meet the national standard, but the ignition point of some products (Example 6) is very low and far from the national standard. Far, while the ignition point of some products (embodiment 8) meets the national standard, the bulk density of its product is very low, far away from the requirements of the national standard, and the multiple quality indicators of the products of the remaining embodiments do not reach the requirements of the national standard

Application No. 200910224054.5 relates to a method for preparing activated coke for flue gas desulfurization by using lignite alone. The obvious disadvantages of product quality are low ignition point and low stack specific gravity, which cannot meet the requirements of the national standard

Application No. 201010301075.5 and Application No. 201110034970.X relate to the preparation method of small granular active coke for flue gas desulfurization, denitrification and mercury removal using lignite alone. The test results given in some examples have a large fluctuation range and the lower limit value is completely Can not meet the requirements of the national standard and market demand, important strength indicators are not given, most of the ignition point indicators in some embodiments can not meet the requirements of the national standard

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