In order to study the distribution of hazardous elements in combustion residues of fuel coal and in other solid by-products in thermal power plants

and their influence upon the surrounding environment

some fuel coal and their solid by-products

i.e.fly ash

slag

gypsum in wet FGD

and sludge in wastewater of FGD etc.

in a few coal-fired power plants have been sychronously sampled

and a set of test methods more appropriate to application being formulated according to relevant testingstandards

the hazardous elements in said samples

i.e.chronium

cadmum

lead

arsenic

and mercury

being tested

and the test results being analysed by using statistical examination method

so as demonstrate whether the non-solid substances exist in each hazardous element after combustion

and to examine the enrichment behavior of each hazardous element after combustion.Thereby

the migration rules of hazardous elements in fuel coal during combustion process in thermal power plants have been demonstrated.Results of study show that the content of heavy metal elements in fly ash and sludge is relatively higher

and having large tendency to environment pollution

it is recommended to adopt measures for preventing said elements from entering into the surface water to pollute the environment.Moreover

the problems related to environment protection regulations currently in effect for hazardous elements emission from thermal power plants have been discussed

and it is suggested to strengthen the detection of hazardous elements in solid by-products resulting from operation process of power plants and the post-evaluation work.