Technology for catalysis and quality improvement by using waste gasified gases

Abstract

The invention discloses a technology for catalysis and quality improvement by using waste gasified gases. A catalyst used for catalytic cracking of tar in gasified gases is selected from bottom slag in a domestic waste fluidized bed incinerator, crushed and activated bottom slag has a certain aperture structure, and calcium oxide and waste iron in the bottom slag have a catalytic cracking effect on the tar. The waste gasified gases are in full contact with the bottom slag catalyst in a multi-hearth furnace, the tar undergoes thermal cracking and catalytic cracking on the surface of the catalyst, and solid particles delay in the multi-hearth furnace. H2 generated after cracking of the tar reduces iron oxides in the catalyst into elemental iron, and CO2 and water vapor in the gasified gases react with carbon deposited on the surface of the catalyst to maintain the activity of the catalyst. The technology fully utilizes the bottom slag of the domestic waste fluidized bed incinerator, realizes waste recycling, realizes decomposition of dioxins in the bottom slag, also realizes recycling of the catalyst, purifies the waste gasified gases, and converts the tar into inflammable gases.

Description

technical field [0001] The invention relates to waste gasification technology, in particular to a process for catalytic upgrading of waste gasification gas. Background technique [0002] With the rapid development of my country's economy, the output of municipal solid waste has increased rapidly. In 2012, the output of municipal solid waste in my country has reached 170 million tons. The long-term random stacking of domestic waste not only occupies a large amount of land, but also causes air, soil and water pollution. At present, the disposal technologies of domestic waste mainly include landfill, fermentation, composting and incineration. It has outstanding advantages and has become the main technical way of urban domestic waste disposal, and the use of fluidized bed to incinerate domestic waste has a wide range of applications in our country. Due to the imperfect classification and sorting mechanism of domestic waste in my country, domestic waste contains a large amount o...

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Problems solved by technology

[0004] At present, the tar removal methods mainly include physical decoking method and thermochemical decoking method. The physical decoking method only transfers the tar from the gas phase to the condensed phase, and cannot make full use of the energy in the tar.

Thermochemical decoking methods include thermal cracking and catalytic cracking. Among them, thermal cracking requires a relatively high temperature. Generally, a good tar cracking rate can only be achieved when the temperature is greater than 1100 ° C. Such a high temperature not only requires the material of the equipment itself It is very high, and requires good insulation equipment, which will inevitably generate a lot of energy consumption, which is unreasonable economically.

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