Efficient, energy-saving and environment-friendly heat energy utilization method with pulverized coal as fuel and system thereof

Abstract

The invention discloses an efficient, energy-saving and environment-friendly heat energy utilization method with pulverized coal as fuel and a system of the method. The method comprises the steps that the pulverized coal is fed into briquette coal processing equipment, briquette coal is converted into two sections of heat raw gas through a two-section type fixed bed gas generating furnace, dry decoking is carried out on the upper section of heat raw gas through dry decoking equipment, dry dust removal is carried out on the lower section of heat raw gas through dry dust removal equipment, then the two sections of heat raw gas respectively enter a heat gas desulfurizer or enter the heat gas desulfurizer after being mixed, and high temperature flue gas exhausted by a boiler passes through a dry heat smoke desulfurizer and a dry heat smoke dust removal device and is exhausted after heat exchange is carried out through final-stage heat exchanger sets. The system comprises the briquette coal processing equipment, the briquette coal processing equipment is connected with the two-section type fixed bed gas generating furnace, the two-section type fixed bed gas generating furnace is connected with the heat gas desulfurizer through the dry decoking equipment and the dry dust removal equipment, the gas desulfurizer is connected with the boiler, and the boiler is connected with the final-stage heat exchanger sets through the dry heat smoke desulfurizer and the dry heat smoke dust removal device. Coal can be saved by about 20 percent compared with a conventional boiler, and cost is saved by about 25 percent compared with a conventional coal-to-gas method and equipment.

Description

technical field [0001] The invention relates to a coal heat utilization method and system, in particular to a highly efficient, energy-saving and environment-friendly heat utilization method and system using pulverized coal as fuel. Background technique [0002] Coal has always been the most important primary energy in our country. Due to the constraints of our country's resources and other conditions, the position of coal in our country's primary energy will be maintained for a long time. Industrial boilers, especially small and medium-sized industrial chain furnaces, are one of the most coal-consuming and widely distributed equipment in China. The existing coal-fired industrial chain furnace generally has the problems of low thermal efficiency and excessive pollutant discharge. Although oil and gas boilers are environmentally friendly and energy-saving, the fuel cost is very high, which is unaffordable for enterprises. In the era of energy saving and emission reduction, ...

AI Technical Summary

Problems solved by technology

The existing fixed-bed gasifiers use lump coal as fuel. Compared with pulverized coal, the price of lump coal is higher. The high price of lump coal limits the application of gasifiers in the boiler industry, and the existing boilers and then coal will Produce a large amount of pollutants such as sulfur dioxide, nitrogen oxides and soot, which has adverse effects on the environment

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