A hot blast stove system and its corresponding combustion control method

Abstract

The invention provides a hot blast stove system. The combustion air is controlled by two valves (a flow-rate adjusting valve and an oxygen volume adjusting valve), the flow-rate adjusting valve can precisely adjust the ratio of the air and the combustion natural gas to be 15:1 so as to guarantee the sufficient combustion of the combustion natural gas; the oxygen volume adjusting valve controls the hot-blast oxygen volume entering the system to be less than 1 percent according to the feedback of an oxygen volume measuring point, so that not only can sufficient oxygen be supplied to the combustion of low-temperature pyrolysis gas, but also the system hot-air inert atmosphere can be maintained, and the spontaneous combustion and explosive risk of the drying and pyrolysis process of the crude coal can be prevented. The weakness of the combustion of the hot blast stove in the prior art can be overcome.

Description

technical field [0001] The invention mainly relates to an improved hot blast stove system and its corresponding combustion control method. Background technique [0002] Lignite is the mineral coal with the lowest degree of coalification, a brown-black, dull low-rank coal between peat and bituminous coal. Rich in volatiles, it burns easily and gives off smoke. Lignite is not suitable for long-term storage and long-distance transportation due to its high moisture content, high volatile content, low calorific value, and high spontaneous combustion characteristics. It has long been regarded as a low-quality coal resource and is currently only used as fuel for pit-mouth power plants and pit-mouth gasification. Raw materials limit the rational development and utilization of lignite resources. How to efficiently transform and utilize low-rank coal such as lignite has become an important issue in coal utilization. One of the most interesting is the conversion of lignite into a re...

AI Technical Summary

Problems solved by technology

[0007] The fresh air available for combustion in the hot blast stove is only the part that flows into the furnace mouth, which is far from meeting the combustion-supporting demand of large-flow gas, causing a large amount of gas to be sucked away by the heat-absorbing fan of the heat transfer system without burning, wasting energy and increasing reduced drying costs;

[0008] The pyrolysis gas produced during the pyrolysis process of coal has a low calorific value, the furnace temperature of the hot blast furnace is low, the combustion of the pyrolysis gas is incomplete, and the emission causes air pollution

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