Thermal pretreatment method and equipment for organic solid waste based on forced hot air convection

Patent metadata

Field	Value
Publication number	US-12044475-B2
Application number	US-202318449645-A
Country	US
Kind code	B2
Filing date	Aug 14, 2023
Priority date	Aug 18, 2022
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

A thermal pretreatment method for organic solid waste based on forced hot air convection is performed as follows. Experimental materials are grouped into an experimental group and a control group. The experimental group is subjected to thermal pretreatment in a thermal pretreatment device, and then removed. The experimental group and the control group are subjected to enzymatic hydrolysis and physicochemical characterization, and the analysis results are compared. A thermal pretreatment device for organic solid waste based on forced hot air convection is also provided.

First claim

What is claimed is:

1. A thermal pretreatment method for organic solid waste (OSW) based on forced hot air convection, comprising:
(a) grouping experimental materials into an experimental group and a control group;
(b) placing the experimental group into an OSW thermal pretreatment device based on forced hot air convection for thermal pretreatment;
(c) removing the experimental group from the OSW thermal pretreatment device; and
(d) subjecting the experimental group and the control group to enzymatic hydrolysis and physicochemical analysis in sequence to obtain analysis results of the experimental group and analysis results of the control group; and comparing the analysis results of the experimental group with the analysis results of the control group;
wherein the OSW thermal pretreatment device comprises a box; a top surface of the box is rotatably connected with a top cover; the box is hollow, and a reaction chamber is fixedly provided in the box; the reaction chamber is configured to accommodate the experimental group; a bottom surface of the reaction chamber is communicated with an inside of the box; a top of the reaction chamber is detachably connected with a moveable cover; a heat dissipating mechanism is provided on the top cover; the heat dissipating mechanism comprises an electric heating wire fixedly provided in the top cover; a top of the electric heating wire is provided with a heat dissipating portion; and a plurality of locking mechanisms are provided evenly spaced apart between the top cover and an inner wall of the box;
a side wall of the box is hollow; each of the plurality of locking mechanisms comprises a first connecting plate fixedly connected to the inner wall of the box; the first connecting plate is hollow, and is connected to the side wall of the box; a second connecting plate is fixedly connected to a top surface of the first connecting plate; a first cavity is provided in the second connecting plate; a sliding groove is provided on a top surface of the second connecting plate, and is communicated with the first cavity; a slider is slidably connected with the sliding groove; an inner wall of the top cover is provided with a groove; the slider is configured to fit the groove; a transmission part is provided in the side wall of the box, and is in transmission connection with the slider;
the transmission part comprises a first motor fixedly connected to the inner wall of the box; an output shaft of the first motor is fixedly connected to a connecting roller; the connecting roller is fixedly connected to a first end of a connecting rope; a second other end of the connecting rope passes through the first connecting plate, the first cavity and the sliding groove in turn, and is fixedly connected to the slider; a spring is fixedly connected between the slider and a side wall of the sliding groove; and the connecting rope is arranged at a bottom of the spring;
the heat dissipating portion comprises a second motor fixedly connected to the inner wall of the top cover; an output shaft of the second motor is fixedly connected to a fan; and the fan is provided on the top of the electric heating wire; and
a second cavity is provided in the top cover; a controller is provided in the second cavity; a side of the top cover is provided with a temperature adjustment knob; the inner wall of the box is fixedly connected with a temperature sensor; the controller is electrically connected to the first motor, the second motor, the temperature adjustment knob, the temperature sensor and the electric heating wire.

2. The thermal pretreatment method of claim 1 , wherein in the step (a), a particle size of the experimental materials is less than 1 mm.

3. The thermal pretreatment method of claim 1 , wherein the step (c) further comprises:
after removing the experimental group from the OSW thermal pretreatment device, cooling the experimental group to room temperature, and storing the experimental group in a dry environment.

4. The thermal pretreatment method of claim 1 , wherein in the step (d), the physicochemical analysis comprises functional group identification based on Fourier Transform Infrared (FTIR) spectroscopy, surface chemical composition determination based on X-ray photoelectron spectroscopy, surface roughness characterization based on atomic force microscopy, crystallinity determination based on X-ray diffraction, BET adsorption properties, vacuum density and contact angle analysis.

5. The thermal pretreatment method of claim 1 , wherein a portion of a bottom of the sliding groove near the first cavity is provided with a first fixed pulley; a second fixed pulley is fixedly provided in the first connecting plate; and the connecting rope is arranged on a surface of the first fixed pulley and a surface of the second fixed pulley.

Assignees

• Univ Tongji

Inventors

• Hua Yu
• Dai Xiaohu

Classifications

• F27D11/02

  Ohmic resistance heating · CPC title

• C12Y302/01008

  Endo-1,4-beta-xylanase (3.2.1.8) · CPC title

• C12Y302/01004

  Cellulase (3.2.1.4), i.e. endo-1,4-beta-glucanase · CPC title

• C12M45/20

  Heating; Cooling (heating or cooling apparatus for laboratory uses B01L7/00) · CPC title

• C12M45/09

  by enzymatic treatment · CPC title