Combined combustion-supporting air heating system of garbage incinerator

Abstract

The invention discloses a combined combustion-supporting air heating system of a garbage incinerator, and relates to the field of combustion-supporting air heating systems of garbage incinerators. The system comprises a steam / air preheater, the air inlet side of the steam / air preheater communicates with a cold air duct and is used for heating air flowing into the cold air duct, the air outlet side of the steam / air preheater communicates with a first hot air duct, the other end of the first hot air duct communicates with a hot blast stove mixing section and a combustor air supply duct, the other end of the combustor air supply duct communicates with a combustor of a hot blast stove, the air outlet side of the hot-blast stove communicates with an incinerator; the steam / air preheater comprises a plurality of steam heat exchange sections, one ends of the steam heat exchange sections communicate with a steam inlet pipe, the other ends of the steam heat exchange sections communicate with a drain pipe, the outer end of the steam inlet pipe communicates with a steam source, and the other end of the drain pipe communicates with a liquid level tank for steam-water separation. The effects that unsmooth drainage and steam leakage of the steam preheater caused by a drain valve are avoided, and the combined combustion-supporting air heating system is suitable for low-heating-value waste incineration and waste incineration cold-state furnace starting of conventional projects are achieved.

Description

technical field [0001] The invention relates to the field of combustion-supporting air heating systems for garbage incinerators, in particular to a combined combustion-supporting air heating system for garbage incinerators. Background technique [0002] In recent years, my country's domestic waste incineration power generation processing capacity has rapidly increased, and the vast majority of waste incineration uses mechanical grate furnaces. However, the progress of waste sorting in third- and fourth-tier cities and rural areas is slow, and the calorific value of waste will not be fundamental in a short period of time. Especially in the low calorific value waste incineration projects in the cold northern regions, the waste fermentation is not good due to the change of ambient temperature, the waste entering the furnace has high water and ash content and low calorific value, and the incinerator is prone to combustion instability. [0003] On February 22, 2017, the China Inte...

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Problems solved by technology

[0004] However, it has the following defects: 1) The failure rate of the trap is high, which can easily lead to poor drainage and affect the heating effect. In addition, there is a certain steam leakage rate in the trap, which increases the steam consumption; 2) The heating steam source in the high-pressure section is Boiler steam drum extraction, once the boiler is not operating normally, the quality of the heating steam will not reach the design value, and the air temperature will not meet the requirements; 3) Limited by the parameters of the heating steam source, it cannot meet the requirements of low calorific value waste incineration and cold start-up waste Combustion air temperature requirements for incineration (250°C and above)

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