COMPLEX DEVELOPMENT METHOD OF COAL FIELD Russian patent published in 2010 - IPC E21C41/18 

FIELD: mining.

SUBSTANCE: invention refers to mining, namely to complex development of coal field during underground coal gasification, and can be used for obtaining underground coal gasification products, heat carrier with specified parametres and for preproduction mining of mercury. At the well output generator gas is first chilled to a temperature no lower than gaseous mercury condensation temperature which produces thermal energy for heat supply systems. Then the gas is chilled to a temperature considerably lower than the mercury vapours condensation temperature and one regulates liquid mercury yield at its condensation which produces a partly refined gas and a warming heat medium. From the warming heat medium liquid mercury is extracted; after that the heat medium is chilled to produce thermal energy for a hot water supply system and a partly chilled heat medium. To the partly chilled heat medium a special reagent (sodium hypochlorite) is added for production of a solution wherewith the partly refined gas is treated to produce a mercury-free gas and solid products of mercury interaction with sodium hypochlorite which are delivered for recycling.

EFFECT: increased efficiency of development due to associated extraction of mercury, and reduced adverse effect to environment.

1 dwg