Flue gas secondary combustion and high-temperature filtering dust removal integrated device and process

Abstract

The invention discloses a flue gas secondary combustion and high-temperature filtering dust removal integrated device. The device comprises a furnace cavity, a cavity dividing plate is arranged at the bottom of the furnace cavity and divides the furnace cavity into a combustion settling area and a filtering area, the upper portion of the combustion settling area communicates with the upper portion of the filtering area, multiple sets of flow guide plates are arranged on the side wall in the combustion settling area, a filtering assembly is arranged between the side walls in the filtering area, and a flue gas inlet and a flue gas outlet are formed in the sides, close to the combustion settling area and the filtering area, of the lower portion of the furnace cavity correspondingly. The invention further discloses a waste incineration treatment process. Flue gas formed by waste incineration or pyrolysis is subjected to secondary combustion and high-temperature filtering dust removal, and flue gas reaching the standard is obtained and discharged through lime water spraying acid removal and activated carbon adsorption. According to the device, full decomposition of dioxin is promoted through the multiple sets of flow guide plates, and fly ash is removed through the filtering assembly; and by means of the process, fly ash treatment is completed while dioxin is fully decomposed,a large amount of dioxin is prevented from being enriched in fly ash, and effective removal of dioxin is ensured.

Description

technical field [0001] The invention belongs to the technical field of waste incineration treatment, and in particular relates to an integrated device and process of flue gas secondary combustion and high-temperature filtration and dust removal. Background technique [0002] With the development of the economy and the substantial improvement of people's living standards, there are more and more urban solid domestic waste, with an average of 1.5kg of domestic waste per person per day. Taking a city with a population of more than 7 million as an example, the preliminary estimate of the daily waste generated by citizens is 10740 tons. The sharp increase in garbage generation is very harmful, damaging the city's appearance, lowering the quality of life of citizens, and polluting people's living environment. Therefore, the method and process of domestic waste disposal is one of the problems that researchers have been paying attention to. [0003] Due to the improvement of envir...

AI Technical Summary

Problems solved by technology

However, the presence of fly ash in the flue gas complicates the five-step treatment process. On the one hand, the two key steps of spraying lime water to remove acid and activated carbon adsorption will also accumulate a large amount of soot by-products rich in dioxins. It increases the difficulty of subsequent by-product treatment; on the other hand, it is also difficult to deal with terminal soot and fly ash

At present, the filtration of fly ash mainly adopts bag dust removal. The main dust removal equipment of most waste incineration power plants in operation is bag filter. However, the harsh environment formed by the high temperature flue gas generated by incineration has caused some difficulties in bag dust removal.

First, the dust removal technology has a narrow temperature range, and can only achieve a filtration treatment at a maximum of about 280°C; currently, high-temperature materials such as PTEE and aramid fiber on the market can withstand a temperature of about 260°C, and their properties will change greatly with temperature fluctuations

Second, the stability is generally poor. The flue gas treatment process of commercially available small equipment is mostly a simplified version of the standard process. The combustion operation of the system is unstable, and the instantaneous temperature rise is easy to burn through the filter bag; the bag has strong water absorption, and low temperature will cause water vapor. Coagulation, easy to form a muddy mixture with fly ash, resulting in failure of bag "paste"

Third, the economy is poor. Due to the limitation of the life of the bag, it has to be replaced frequently. The technical requirements for equipment shutdown and maintenance are high, the system stability is poor, the pipeline is easy to accumulate dust, and it is easy to cause a series of problems such as damage to the flue gas treatment equipment.

Fourth, the biodegradability of cloth bags is poor. So far, there is no good treatment method for the failed cloth bags. Most of them are disposed of as garbage. No matter they are incinerated or buried, they will cause secondary pollution.

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