Method for performing multi-level quality-lifting on mixed organic solid waste based on molten salt

A solid waste and organic solid technology, applied in the fields of solid waste removal, chemical instruments and methods, furniture waste recycling, etc., can solve the problems of graded utilization of unfavorable products and high processing costs, and achieve high-value utilization and multi-level Effect of low upgrading temperature, degree of homogenization and improved fuel properties

Active Publication Date: 2019-03-29
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, too high a temperature has higher requirements on equipment and materials, which makes t...

Method used

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  • Method for performing multi-level quality-lifting on mixed organic solid waste based on molten salt
  • Method for performing multi-level quality-lifting on mixed organic solid waste based on molten salt
  • Method for performing multi-level quality-lifting on mixed organic solid waste based on molten salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Drying of solid waste: The mixture of sycamore bark and polypropylene (PP) was placed in an oven at 110° C. until the moisture content decreased to 20%.

[0026] (2) Introduction and penetration of hot molten salt: molten salt is made of NaNO 3 -KNO 3 -NaNO 2 Mix according to the mass fraction of 7%-53%-40% (melting point is 142°C), and obtain after heating and melting. The solid waste obtained in step (1) is sent into molten salt, and the liquid molten salt is ensured to penetrate into the mixed solid waste.

[0027] (3) Heating, aeration and acid-base modulation: heating the molten salt through an external heat source, and maintaining the internal reaction temperature of the molten salt at 350°C through program control; adding an acid-base regulator 15% NaOH to the molten salt while feeding it into the reaction chamber. The atmosphere required is air + 5% water vapor.

[0028] (4) Classification of mixture: after PP is melted, the sycamore bark is pressed to t...

Embodiment 2

[0035] (1) Drying of solid waste: The mixture of disposable wooden chopsticks, A4 paper, and polyvinyl chloride (PVC) was placed in an oven at 100°C until the moisture content was reduced to 25%.

[0036] (2) Introduction and penetration of hot molten salt: molten salt is made of KNO 3 -LiNO 3 -Ca(NO 3 ) 2 According to the mass fraction of 50%-80%-0%-25%-10%-45%, mix (melting point below 80°C), and obtain after heating and melting. The solid waste obtained in step (1) is fed into molten salt, and the liquid molten salt is ensured to penetrate into the mixed solid waste.

[0037] (3) Heating, aeration and acid-base modulation: heating the molten salt through an external heat source, and maintaining the internal reaction temperature of the molten salt at 250°C through program control; adding an acid-base regulator 10% NaOH+5% CaOH to the molten salt, At the same time, the atmosphere required for the reaction, ie, air, was introduced.

[0038] (4) Classification of mixture: ...

Embodiment 3

[0045] (1) Drying of solid waste: The mixture of express carton, old clothes, polyethylene (PE) was placed in an oven at 105°C until the moisture content was reduced to 22%.

[0046] (2) Introduction and permeation of hot molten salt: The molten salt is mixed with Na-NO3-KNO3-LiNO3-Na NO2 in a mass fraction of 14.2%-50.5%-17.5%-17.8% (melting point is 99°C). The solid waste obtained in step (1) is sent into molten salt, and the liquid molten salt is ensured to penetrate into the mixed solid waste.

[0047] (3) Heating, aeration and acid-base modulation: heating the molten salt through an external heat source, and maintaining the internal reaction temperature of the molten salt at 150°C through program control; adding an acid-base regulator 5% CaOH to the molten salt, and feeding the reaction The required atmosphere is air + 20% water vapor.

[0048] (4) Classification of the mixture: After the PE is melted, the sycamore bark is pressed to the bottom of the reactor by using a ...

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Abstract

The invention relates to a method for performing multi-level quality-lifting on mixed organic solid waste based on molten salt. According to the method for performing multi-level quality-lifting on the mixed organic solid waste based on the molten salt, good heat storing and heat transferring properties, lower viscosity, stable chemical properties and a certain catalytic property of the molten salt are used, and the problems that the separation difficulty of the mixed organic solid waste is high, the use value is low and the pollutant concentration is high are solved. The method comprises thesteps of introduction and thorough pouring of the hot molten salt, heating, aeration, modulation of acid and alkali, cooling level by level, precipitation of thermoplastic samples, discharging of themolten salt and elution of residues by the molten salt to remove impurities. The quality-lifting solid product separating effect is good, the recovery rate is high, and the degree of homogenization and the fuel characteristics are improved; and meanwhile, certain effects of removal of N, Cl and S pollutants and de-ashing in the molten salt are realized. The working procedures are relatively simple, the reaction conditions are easy to control, the time is short, the efficiency is high, and effective separation, quality-lifting and pollutant removal of the mixed organic solid waste can be realized.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of organic solid wastes, and more particularly, relates to a method for mixing organic solid wastes based on molten salt multi-stage upgrading. Background technique [0002] Human daily life and agricultural production process will generate a large amount of solid waste, among which the organic solid waste contains a large amount of hydrocarbon organic substances and has great potential utilization value. However, organic solid wastes are various and often mixed together, such as biomass and plastic components in municipal solid waste, plant waste in agricultural solid waste and plastic films used in production. Solid wastes with complex components are difficult to treat, and the mixed components often contain certain high S, high Cl or high N components, which is not conducive to the high-quality utilization of organic solid wastes. The invention patent with publication number CN104...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B5/00B09B3/40Y02W30/78
Inventor 胡红云杨宇涵姚洪唐华刘欢杨福
Owner HUAZHONG UNIV OF SCI & TECH
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