Integrated method and device for sludge drying incineration and power generation

Abstract

The invention discloses an integrated method and device for sludge drying incineration and power generation. The device of the invention comprises a screw rotary type sludge drier; dried sludge enters a fluidized bed boiler to be performed with incineration; steam generated by incineration is used for carrying out power generation; exhaust steam from a small steam turbine is adopted to dry the sludge, thereby realizing cascade utilization of steam heat energy; the electric energy generated by a small generator set can sufficiently meet power utilization in the operation of equipment, thus reducing the operating cost and fully saving energy; and sludge drying incineration and power generation are integrated into a whole. In the invention, the screw rotary type sludge drier is used for feeding the fluidized bed incineration boiler, the steam generated by incineration is used for carrying out power generation, and the low-grade exhaust steam from the steam turbine is adopted as the heat source of the drier, thereby greatly improving the heat efficiency of a steam power device; meantime, the electric energy generated by the small generator set can sufficiently meet power utilization in the operation of the equipment, thus reducing the operating cost; and with the integration design, the system has reasonable and compact connection of the integrated device, mature equipment structure and better economical efficiency.

Description

technical field [0001] The invention relates to a treatment method for solid waste to be harmless, resource-based and energy-based, and more particularly to an integrated method and device for sludge drying, incineration and power generation. Background technique [0002] All kinds of sediment and floating matter produced in the process of water supply and wastewater treatment are collectively referred to as sludge. Sludge produced by general sewage treatment plants is a solid or fluid substance with a water content ranging from 75% to 99%. Due to its high organic content, perishability, strong odor, and contains parasite eggs, pathogenic microorganisms and heavy metals such as copper, zinc, chromium, mercury, as well as salts, polychlorinated biphenyls, dioxins and other refractory substances Toxic and harmful substances, if not handled properly, will be discharged randomly, which will cause secondary pollution. [0003] With the development of social economy and urbaniza...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an integrated method and device for sludge drying, incineration and power generation, which solves the problem of high power consumption and high operating costs in the drying and incineration process and equipment in the sludge treatment process in the prior art. Thermal energy can not be fully utilized and other technical problems

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