Low-temperature pre-dechlorination method and device for low-dioxin thermochemical conversion process
A thermochemical conversion and dechlorination technology, applied in chemical instruments and methods, inorganic chemistry, transportation and packaging, etc., can solve the problem of difficult control of dioxin emissions
Active Publication Date: 2021-11-23
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to provide a high-efficiency, low-energy low-temperature pre-dechlorination method and device for the low-dioxin thermochemical conversion process in order to overcome the defects in the above-mentioned prior art, so as to solve the problem of the above-mentioned domestic garbage containing Difficult control of dioxin emissions during thermochemical conversion of chlorine raw materials
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Embodiment 1
[0024] like figure 1 As shown, a low-temperature pre-dechlorination device for low-dioxin thermochemical conversion process, including:
[0025] Heat source 1: through electric heating, gas or liquid fuel combustion, high-temperature flue gas heat exchange, etc., to provide heat for the temperature rise of chlorine-containing raw materials 2 such as domestic garbage. The heat supply should match the raw material delivery rate, and the raw material can be heated to 300 °C, the C-Cl in the raw material molecule is broken and the other chemical bonds contained in it remain stable, ensuring that the chlorine functional group falls off independently during the conversion process. When polyvinyl chloride raw materials are used, this temperature can quickly and fully dechlorinate the raw materials within 15 minutes, and the amount of chlorinated hydrocarbons produced in the subsequent thermal conversion process is greatly reduced, such as figure 2 shown;
[0026] Conveyor 3: House...
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The invention relates to a low-temperature pre-dechlorination method used in a low-dioxin thermochemical conversion process, comprising the following steps: (1): uniformly heating chlorine-containing raw materials to the temperature at which chlorine functional groups fall off independently; (2): making oxygen Full contact with the raw material, with the help of heterogeneous oxidation reaction to release heat in situ, to promote C-Cl bond breaking; (3): make hydrogen fully contact with the raw material, capture chlorine free radicals in the off-site position, and form stable HCl molecules. Compared with the prior art, the present invention can efficiently remove organic chlorine contained in the raw material while retaining the calorific value and reactivity of the raw material, and has the ability to significantly inhibit dioxin pollutants and related chlorination in the subsequent thermochemical conversion process. The role of hydrocarbon precursors.
Description
technical field [0001] The present invention relates to the thermochemical conversion process of domestic garbage and other chlorine-containing raw materials, specifically a low-temperature pre-dechlorination method and device for low-dioxin thermochemical conversion process, so as to suppress the formation of dioxins in the subsequent thermal conversion process the goal of. Background technique [0002] The volume of domestic waste removal and transportation in my country has reached 228.018 million tons by 2018. Limited by precious land resources, the pressure of landfill technology is huge. Thermochemical conversion technology led by incineration has gradually attracted attention due to its small footprint, high degree of reduction, and energy recovery. By 2018, the proportion of waste treatment by incineration technology has reached 44.667%, but its application and promotion are restricted by Emissions of dioxin pollutants. Dioxin pollutants (PCDD / F) are formed in two ...
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IPC IPC(8): B09B3/00C01B7/03
CPCB09B3/00C01B7/035B09B3/40
Inventor 张睿智罗永浩
Owner SHANGHAI JIAOTONG UNIV