The precipitation rules of components in Shenhua bituminous coal during medium speed pyrolysis was analyzed.On the basis of a tube furnace

the pyrolysis products of Shenhua bituminous coal at different temperatures and pressures were obtained

and the pyrolysis mechanism was investigated.Moreover

the pyrolysis components distribution

yields and weight loss rules during pyrolysis were also researched.The results show that

at high heating rate(up to 100 K/s)

the weight loss rate increased with the pyrolysis temperature

and decreased as the pyrolysis pressure increased.The main components of the pyrolysis gas were H_2 and CO

then were CH_4 and CO_2

and the content of C_3H_8 and O_2 was almost zero

and their order of precipitation was different.The precipitation curves of all light components showed unimodal or bimodal distribution with a certain peak width.The pyrolysis pressure had a relatively great influence on the precipitation peak of the component.The total yield of the pyrolysis gas increased with the pyrolysis temperature

but it had a nonlinear relationship with the pyrolysis pressure..