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Hazardous waste vitrification regulation and control system and method

A technology of hazardous waste and control system, applied in chemical instruments and methods, waste treatment, combustion methods, etc., can solve the problems of high energy consumption of the system, unstable glass body content, etc., and achieve the effect of improving the yield rate

Active Publication Date: 2021-08-24
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, there is a deficiency in the control of the quality of the vitreous body in the vitrified product after the melting of hazardous waste. It is urgent to design a vitrification control system for hazardous waste to solve the problem of unstable vitreous content in the molten vitrified product of hazardous waste. At the same time, it solves the problems of tail gas treatment after melting and high energy consumption of the system, which can provide technical support for the development of low-consumption, clean and stable hazardous waste vitrification technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the temperature of the molten material is 1500°C, the pore size of the ceramic filter membrane is 1um, and the pressure value of the air pump is 50MPa; according to the above-mentioned vitrification control method for hazardous waste, the amount of liquid nitrogen used is 1 / 2 of the volume of the molten material. 20 times, first rapidly cool the molten material, reduce the temperature of the molten material to 500°C within 2 minutes, and the cooling rate is 500°C / min to ensure the formation of the glass body; then stop the supply of liquid nitrogen, keep it warm for 10 minutes, and again Liquid nitrogen is introduced for cooling, the temperature of the molten material is reduced to 100°C within 5 minutes, and the cooling rate is controlled at 100°C / min-150°C / min to ensure the yield of glassy products; The vitreous body content of the glassy product is more than 99%, and the yield rate of the prepared glassy product is 100%.

Embodiment 2

[0036] The difference between this embodiment and Example 1 is that the amount of liquid nitrogen used is 5 times the volume of the molten material. First, the molten material is rapidly cooled, and the temperature of the molten material is reduced to 700 ° C within 2 minutes. The speed is 400°C / min, then stop the supply of liquid nitrogen, keep the temperature for 10 minutes, and then pass through liquid nitrogen for cooling again, reduce the temperature of the molten material to 100°C within 5 minutes, and control the cooling rate at 100°C / min-150 °C / min; the glass body content of the glassy product after cooling the molten material is measured to be more than 93%, and the yield of the glassy product is 100%.

Embodiment 3

[0038] The difference between this embodiment and Example 1 is that the amount of liquid nitrogen used is 30 times the volume of the molten material. First, the molten material is rapidly cooled, and the temperature of the molten material is reduced to 400 ° C within 2 minutes. The speed is 550°C / min, then stop the supply of liquid nitrogen, keep the temperature for 10 minutes, and then pass through liquid nitrogen for cooling again, reduce the temperature of the molten material to 100°C within 5 minutes, and control the cooling rate at 100°C / min-150 °C / min; the measured vitreous content of the glassy product after the molten material is cooled is more than 92%, and the good product rate of the prepared glassy product is 100%.

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Abstract

The invention provides a hazardous waste vitrification regulation and control system. The system comprises a liquid nitrogen cooling subsystem, a flue gas dust removal subsystem and an energy recovery subsystem, wherein the liquid nitrogen cooling subsystem is used for cooling hazardous waste molten materials; the flue gas dust removal subsystem is used for performing innocent treatment on tail gas generated in the liquid nitrogen cooling subsystem; and the energy recovery subsystem is used for recovering and reusing heat in a ceramic membrane filtration subsystem. The invention further provides a regulation and control method based on the hazardous waste vitrification regulation and control system. By means of the method and the system, directional regulation and control over a hazardous waste molten glass body are achieved, and the yield of the hazardous waste molten glass body is increased and can reach 100%; tail gas generated after the hazardous waste is molten is filtered, and harmless treatment of the tail gas is achieved; and energy recycling is achieved, and energy consumption of the system is reduced.

Description

technical field [0001] The invention relates to the technical field of hazardous waste melting vitrification, in particular to a hazardous waste vitrification control system and method. Background technique [0002] At present, household garbage and some hazardous waste have become hazardous wastes strictly controlled by the state. In 2019, the national urban household garbage removal volume reached 242.062 million tons. The issue of household garbage treatment and disposal has attracted much attention. Garbage incineration has gradually become one of the mainstream methods for disposing of hazardous waste such as household garbage in my country due to its advantages of significant reduction, less land occupation and energy conversion. In 2019, about 3.65 million fly ash was generated due to household garbage incineration. Ton. Domestic waste incineration fly ash contains organic pollutants such as benzopyrene, benzanthracene, and dioxin, and heavy metals such as Cr, Cd, Hg,...

Claims

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Application Information

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IPC IPC(8): F23G5/44F23G5/46F25D3/10F28D21/00B09B3/00
CPCF23G5/44F23G5/46F25D3/10F28D21/001B09B3/40Y02W30/20
Inventor 冯华军曹锴徐颖峰厉炯慧
Owner ZHEJIANG GONGSHANG UNIVERSITY
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