Process for generating power by coupling intermediate storage type pulverizing system with sludge drying incineration

Abstract

The invention discloses a process for generating power by coupling an intermediate storage type coal pulverizing system with sludge drying incineration. The process utilizes the intermediate storage type coal pulverizing system, the intermediate storage type coal pulverizing system comprises a furnace smoke suction pipe and a steel ball coal mill, the steel ball coal mill uses sludge conveyed by apumping system, the furnace smoke suction pipe is used for sucking hot smoke at the bottom of a boiler hearth and sending the hot smoke into the steel ball coal mill for pre-drying of the sludge. According to the process, with addition of the furnace smoke suction pipe, the hot smoke at the bottom of the hearth is sucked to enter the steel ball coal mill, so that the drying capacity of the coal pulverizing system is improved, sludge can be fully dried by the hot smoke, moisture-carrying exhaust gas finally enters the hearth through a tertiary air nozzle, staged combustion is achieved, and NOxemission is reduced; and the hot smoke sucked by the furnace smoke suction pipe can form inert atmosphere in the coal pulverizing system, therefore, the adaptability of the coal pulverizing system tovolatile components mixed with the sludge is improved, and the explosion-proof risk is reduced.

Description

technical field [0001] The invention belongs to the technical field of coal-fired coupled sludge power generation, and in particular relates to a process for coupling sludge drying and incineration to generate power by using a mid-storage pulverizing system. Background technique [0002] With the rapid increase of my country's urbanization rate and urbanization level, my country's urban sewage treatment capacity has been continuously improved. As of the end of 2016, the total discharge of wastewater in the country was 71.110 billion tons, and the discharge of domestic sewage accounted for 71.4%. The discharge of domestic sewage in only 31 major cities and towns has reached 17.681 billion tons. The urban domestic sewage treatment rate is 93.44%, and the sludge output in major cities across the country is about 40 million tons based on 80% moisture. Although municipal sludge is rich in organic matter and various nutrients, it also contains a large number of toxic and harmful ...

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to overcome the shortcomings of the existing sludge co-firing technology, which cannot realize a large proportion of sludge co-firing in the mid-storage pulverization system of the steel ball coal mill, and provide a method of using mid-storage pulverization The system is coupled with the process of sludge drying and incineration for power generation. Through partial optimization and transformation of the pulverizing system, the drying capacity of the steel ball coal mill is greatly improved under the premise of taking into account explosion protection, and a large proportion of sludge is blended.

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