Laboratory research focusing method

The experimental devices mainly used in laboratory research laboratories are microtube reactors and thermogravimetric balances. The coke measurement methods mainly include chemical focus measurement and weight measurement.

Direct-weighing method for measuring coke weights Coking is the placing of coked specimens (hanging pieces) in a mini-tubular cracking reactor, and then weighing the quality of the coking specimens (hanging pieces) before and after the reaction, from which unit coking can be calculated. The coking rate of the test piece area per unit time, and the form of the formed coke can be observed. It is the Petroleum Institute that mainly uses this technology in China. They use light diesel oil as the cracking raw material and water as the diluent. It is believed that after the cracking reaction is carried out to a certain depth, the resulting unsaturated gaseous hydrocarbons will undergo polycondensation reaction and generate relatively low molecular weight hydrogen-depleted substances. The composition and structure are very high. Uncertain, bitumen-like hydrogen-poor matter is the coking precursor to coke. In the cracking process, coke is not generated directly in the gas phase, and the coking precursor generated mainly in the gas phase diffuses into the vicinity of the reaction tube wall surface, and then is adsorbed on the surface to react. Not only is it unevenly distributed in quantity, but its structure also varies with depth of cracking and running time. Coke can be divided into two forms: the first is silver-gray flake coke, the surface of coke is relatively flat, and it is easy to fall off. It is mainly produced under the conditions of shallow cracking and short running time; the second is dark black. The surface shows the aggregation state of many small spherical particles, and the surface roughness is large, and it is generated under conditions of large cracking depth and long running time.