Disposal system and process for melting hazardous waste by plasma gasification

Abstract

The invention provides a disposal system and process for melting hazardous waste by plasma gasification. The system includes a plasma gasification melting furnace, an exhaust heat boiler, a washing tower, a dedusting device and an exhaust device. The plasma gasification melting furnace melts the crushed hazardous waste. The exhaust heat boiler recovers sensible heat of synthetic gas discharged from the plasma gasification melting furnace. The washing tower cools, deacidifies and dedusts the synthetic gas passing through the exhaust heat boiler. The dedusting device further dedusts the synthetic gas discharged from the washing tower. The exhaust device includes a torch or a fuel gas boiler. The torch burns the synthetic gas passing through the dedusting device. The fuel gas boiler recoverschemical energy of the gas passing through the dedusting device.

Description

technical field [0001] The invention relates to a plasma gasification and melting hazardous waste disposal system and process. Background technique [0002] A plasma gasification and melting system for centralized treatment of solid waste, including a plasma gasification and melting furnace, the synthesis gas outlet of the plasma gasification and melting furnace is connected to a second combustion chamber, and the high-temperature flue gas outlet of the second combustion chamber is connected to waste heat in turn recovery system and flue gas purification system. [0003] In this type of system, after the hazardous waste is melted by plasma gasification, the syngas exiting the plasma gasification furnace is directly burned in the secondary combustion chamber. After the flue gas is heat-exchanged by the waste heat boiler, the flue gas temperature drops to about 500°C and then enters the quenching semi-dry deacidification tower. During this process, the flue gas completes quen...

AI Technical Summary

Problems solved by technology

First, due to the use of air in the process of burning, thermodynamic NOx will inevitably be generated in this process, which will increase the burden of subsequent denitrification

Second, the incineration scheme only collects the sensible heat of the flue gas in the range of 1100-500 °C by the waste heat boiler, and the energy recovery rate for the flue gas is low

Moreover, since most of the cloth bags at this stage contain PTFE materials, these cloth bags also need to be incinerated for disposal after 2-3 years of use, and F (fluorine) elements will be released during the disposal process, thus increasing the difficulty of flue gas purification and System Anticorrosion Requirements

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