Efficient steam boiler for gasification and combined combustion of pulverized coal

Abstract

The invention discloses an efficient steam boiler for gasification and combined combustion of pulverized coal, comprising a blast blower, a pulverized coal bunker, a pulverized coal transmission pipe, a combustion chamber, a gasification chamber, a hearth, a horizontal flue, a steam superheater, a tail shaft and a boiler support, wherein the blast blower is connected with the pulverized coal bunker, and connected with the gasification chamber through the pulverized coal transmission pipe; a combustor is connected with the gasification chamber; the gasification chamber, the hearth, the horizontal flue and the tail shaft are connected in order, and arranged on the boiler support to form an inversed U shape; a non-combustion zone is arranged above the joint of the hearth and the gasification chamber; the hearth is provided with a jet flow air inlet and a secondary air inlet at the bottom; the outlet of the non-combustion zone is provided with a tertiary air inlet; the steam superheater is arranged in the horizontal flue; and the tail shaft is internally provided with a coal economizer and an air preheater. The efficient steam boiler for gasification and combined combustion of pulverized coal disclosed by the invention saves space, reduces dust emission, realizes gasified transmission, and stabilizes combustion; and the burn-off rate of the pulverized coal is above 99%, and the heat efficiency is above 93%.

Description

technical field [0001] The invention relates to the technical field of boiler manufacturing, in particular to a high-efficiency pulverized coal gasification and pulverized coal composite combustion steam boiler. Background technique [0002] Small and medium-sized coal-fired industrial boilers are the main coal-consuming equipment in my country. There are more than 500,000 units in the country, with a total capacity of 2 million tons and an annual coal consumption of about 400 million tons. Most of them are chain grate boilers. The average thermal efficiency of these boilers mostly does not exceed 70%. At the same time, these boilers generally have simple environmental protection measures, powder (smoke) dust, SO2, and NOx emissions cannot meet the standards, and regional coal pollution is very serious. With the rapid development of our country's economy, the pace of building a thrifty well-off society has been significantly accelerated, and to meet the strong desire of the ...

AI Technical Summary

Problems solved by technology

There are the following problems: coal gasification equipment needs to be equipped, which increases equipment investment, and the workload of operation and management is heavy; because the furnace is low, it affects the burnout rate of high-temperature flue gas that has not been burned out of pulverized coal

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