Fly ash melting system based on pure oxygen combustion and used for waste incineration plant

Abstract

The invention discloses a fly ash melting system based on pure oxygen combustion and used for a waste incineration plant, and belongs to the technical field of fly ash melting systems. The fly ash melting system based on pure oxygen combustion and used for the waste incineration plant comprises a biogas pool, a liquid oxygen tank, a fly ash melting furnace, a heat exchanger, an alkali liquid spraytower, a dust remover, an adsorption tower, a fan and a chimney, wherein a feeding port is connected to the biogas pool; a gas storage tank is connected to the upper end of the biogas pool, and the biogas pool communicates with the gas storage tank; a gas transmission pipe I is connected between the liquid oxygen tank and the fly ash melting furnace; a gas transmission pipe B is connected betweenthe gas storage tank and the fly ash melting furnace; and a charging port is formed in one side of the fly ash melting furnace. The biogas generated by a leachate in the waste incineration plant canbe taken as a fuel; pure oxygen is used for combustion supporting for the fly ash melting furnace, so that the biogas generated by the leachate in the waste incineration plant is consumed, synchronousresourceful disposal is realized, and the treatment cost is greatly reduced; and moreover, adequate treatment for waste gas is achieved, and the secondary pollution of waste gas is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of fly ash melting systems, more specifically, to a fly ash melting system for waste incineration plants based on pure oxygen combustion. Background technique [0002] At present, there are more than 300 municipal solid waste incineration plants in my country, with an annual incineration capacity of 70 million tons. Calculated at an average ratio of 5-8%, the incineration fly ash is 3.5-5.6 million tons per year. Fly ash contains a large amount of heavy metals and dioxins, and is internationally classified as hazardous waste. There are three relatively safe disposal methods for waste fly ash in the world: melting treatment for recycling, chelation treatment for landfill, and solidification treatment for landfill. Some developed countries promote recycling of fly ash after melting treatment. [0003] The Chinese invention patent with the notification number CN105983567B discloses a recycling process for dome...

AI Technical Summary

Problems solved by technology

[0003] The Chinese invention patent with the notification number CN105983567B discloses a recycling process for domestic and construction waste resources, which mentions "biogas combustion", "eradicates secondary pollution, and recycles domestic waste and construction waste". The process is very good for green treatment of domestic and construction waste, but the scope of application is very limited, and many pollutants cannot be eliminated

[0004] Existing waste incineration plants generally have a large amount of leachate, which is very easy to cause secondary pollution, but these leachate can be used to generate biogas, which is not used reasonably in the prior art, and In the prior art, fly ash melting treatment usually adopts coal powder, coke or electrothermal melting method to melt and process fly ash. The processing cost is very high, and the processing cost per ton of fly ash is not less than 1,000 yuan, so it is difficult to promote in many domestic enterprises.

Images