RU2007141758A - METHOD FOR COMPREHENSIVE USE OF SOLID FUELS IN POWER INSTALLATIONS OF THE COMBINED CYCLE WITH JOINT PRODUCTION OF ENERGY AND FURTHER PRODUCTS AS LIQUID AND SOLID FUEL FUELS - Google Patents

Abstract

1. A method of environmentally friendly integrated use of solid fuels, mainly low-grade high-reaction coals (brown and stone with a high yield of volatile), integrated into the heat cycle of a combined cycle gas turbine plant with the aim of co-production of low-calorie purified gas to generate energy and commercial by-products in the form of refined solid, liquid boiler and high-purity synthetic motor fuels, including a combined cycle power plant (CCGT), coal crushing and drying , oxidizing gasification to produce low-calorie generator gas with heat recovery from exothermic reactions in the cycle of a power plant, purification of gas from solid particles and sulfur compounds and the use of purified gas as fuel for a combined cycle power plant, characterized in that:! part of the air after the CCGT high-pressure compressor is used for a three-stage countercurrent process of thermochemical coal processing, in which, in the first stage, the dried and crushed initial coal is pyrolyzed due to the heat of gasification products coming from the second stage, with the formation of pyrolysis products in the form of coal tar and pyrogas which are removed from the first stage together with gasification products, followed by the release of liquid resins to obtain by-products and purified energy of gas for power generation in PSU, and char, which is sent for processing to the second stage by oxidative gasification of a mixture of air and combustion products coming from the third stage, the resultant gene

Claims (3)

1. A method of environmentally friendly integrated use of solid fuels, mainly low-grade high-reactive coals (brown and stone with a high yield of volatile), integrated into the heat cycle of a combined cycle gas turbine plant with the aim of co-production of low-calorie purified gas to generate energy and commercial by-products in the form of refined solid, liquid boiler and high-purity synthetic motor fuels, including a combined cycle power plant (CCGT), coal crushing and drying oxidizing gasification to produce a low-calorie generator gas with heat recovery from exothermic reactions in the cycle of a power plant, purification of gas from solid particles and sulfur compounds and the use of purified gas as fuel for a combined cycle power plant, characterized in that: part of the air after the CCGT high-pressure compressor is used for a three-stage countercurrent process of thermochemical coal processing, in which, in the first stage, the dried and crushed raw coal is pyrolyzed due to the heat of gasification products coming from the second stage, with the formation of pyrolysis products in the form of coal tar and pyrogas vapor which are removed from the first stage together with gasification products, followed by the release of liquid resins to obtain by-products and purified energy gas for energy production at CCP, and semi-coke, which is sent for processing to the second stage by oxidizing gasification with a mixture of air and combustion products coming from the third stage, the resulting generator gas is sent to the first stage for pyrolysis, coal ash containing metal sulfides with residues carbon is subjected to postburning in the third stage using part of the air from the CCGT high-pressure compressor as an oxidizing agent, as a result of which carbon burns out, while the metal sulfides oxidize t to environmentally friendly sulfates, the ash is cooled and removed from the cycle with the utilization of physical and chemical heat in the process of gasification of the second stage semicoke. 2. The method according to claim 1, characterized in that in order to intensify the processes of gasification and pyrolysis, as well as to increase the yield of liquid fractions in all stages of processing using the technology of fluidized and circulating fluidized bed. 3. The method according to claim 1, characterized in that the cleaning of the vapor-gas mixture obtained after a three-stage processing of coal containing a pair of coal tar, ash particles and semi-coke is carried out with gas cooling and condensation of the coal tar vapor by a two-stage washing with liquid resins circulating after washing through heat exchangers - coolers with various temperature levels during washing, while in the first stage along the gas-vapor mixture at a higher temperature, the heavier resin fractions are condensed and extracted together with the new part of the captured solid particles, which are sent for use as a binder in the production of coal briquettes, and in the second stage, at a lower temperature, lighter and cleaner fractions of coal resins are condensed and recovered, which are used as the basis for the production of liquid boiler fuels, while the heat from condensation of the resins and cooling of the gas-vapor mixture is utilized in the steam turbine cycle of the vocational school.