A method of heat -solving power generation and comprehensive utilization of rice shells

A technology of pyrolysis, rice husk, applied in the direction of nanotechnology, adhesive type, aldehyde/ketone condensation polymer adhesive, etc. for materials and surface science, which can solve the loss of heat, waste of energy, inability to process, etc. problems, to achieve the effect of increasing energy density, avoiding waste water generation, and saving energy consumption

Active Publication Date: 2020-06-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) During the pyrolysis process of rice husk, the cooling area of ​​the pyrolysis tower is immersed in the water pool, the cold water cools down, the temperature of pyrolysis gas and pyrolysis carbon is reduced from 600°C to 700°C to 300°C to 400°C, and most of the heat is lost. wasted energy
[0004] (2) The pyrolysis gas contains tar. After being washed and purified, it is introduced into a generator for combustion and power generation, resulting in a large amount of wastewater containing phenolic tar, which cannot be treated and evaporates continuously in the water storage tank, seriously polluting the environment.
[0005] (3) After washing with water, the pyrolysis gas is cooled from 300°C to 400°C to less than 50°C, and the heat is taken away by the waste water, which wastes part of the energy
[0006] (4) Except for a small part of pyrolytic carbon used in steel mills, it has not become an industrial product that can be used so far, and it has become a solid waste that pollutes the environment
The composition of tar is complex, the molecular weight is different, and the separation is very difficult
[0008] (6) The oxygen content in the pyrolysis gas cannot be controlled, and the electrostatic coke catcher cannot be used, and there is a danger of explosion. Only water washing can be used to purify and decoke, resulting in a large amount of phenol-containing wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The method for power generation and comprehensive utilization of rice husk pyrolysis specifically includes the following steps:

[0053] Step 1. Rice husk pyrolysis

[0054] Select rice husks, screen and purify them and add them to the pyrolysis tower through the bucket elevator, and then enter the drying zone, pyrolysis zone, oxygen removal and decoking zone, and cooling zone in sequence, so that the temperature of the pyrolysis section is kept at 650 ° C, and the pyrolysis is 0.5 hours. Rice husk is decomposed into pyrolysis gas and pyrolysis carbon;

[0055] Step 2. Deoxygenation and coke-rich phenol

[0056] The 650°C pyrolysis gas and pyrolysis charcoal obtained in the step 1 continue to descend along the pyrolysis tower, and maintain a constant temperature to remove oxygen and decoke for 0.5 hours to obtain anaerobic pyrolysis gas and pyrolysis charcoal, and eliminate the Oxygen, so that the pyrolysis gas and pyrolysis carbon are in an oxygen-free state in the f...

Embodiment 2

[0068] 1. Pyrolytic carbon cooling

[0069] The pyrolytic charcoal in Step 2 of Example 1 continues to descend into the indirect water-cooled cooling section of the pyrolysis tower tubes, cools down to 250°C, and falls to the bottom of the pyrolysis tower, and is sent into the sealed storage bin through the screw propeller; water-cooled and cooled to form The high-temperature water vapor is directly introduced into the tar steam reforming furnace;

[0070] 2. Preparation of nano-silica

[0071] Transfer the remaining solid obtained in Step 5 of Example 1 to the reactor, add a hydrochloric acid solution with a concentration of 5wt% according to the solid-to-liquid ratio of 1Kg: 5L, heat up to 120°C, seal the reaction for 30min, cool down, filter, and separate the filtrate and filter cake ; The filter cake was washed to neutral, dried, pulverized and dispersed to prepare silica / carbon powder; and then heat-treated at 600°C to prepare a high-purity nano-silica powder with a puri...

Embodiment 3

[0074] The phenol-rich wastewater in Step 3 and Step 5 in Example 1 was combined, and the total phenol content was calibrated to be 32wt%. According to the weight ratio of formaldehyde to phenol is 1:2, and sodium hydroxide is 6% of the mass of phenol, phenol-rich wastewater and sodium hydroxide are added to the reaction kettle, and when the temperature rises to 50°C, the concentration of the first batch is 37 wt%. formaldehyde solution (accounting for 80% of the total formaldehyde solution), and react at a constant temperature of 60°C for 1h. Raise the temperature to 80°C, add the remaining formaldehyde solution, and react at a constant temperature at 80°C for 2 hours, then cool the system down to 45°C-50°C, stop the reaction, and dehydrate the obtained phenolic resin under reduced pressure at 65°C until the viscosity reaches 600mPa·s , discharging, and preparing a biomass phenol-based adhesive.

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PUM

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Abstract

The invention relates to a rice husk pyrolysis electric power generating and comprehensive utilization method, and belongs to the field of biomass energy chemistry. The method comprises following steps: 1, biomass pyrolysis generation of pyrolysis gas and pyrolytic carbon; 2, synchronous oxygen removing, tar reduction, and phenol enrichment; 3, pyrolysis gas heat exchange cooling heat recycling, and separation of phenol containing waste water; 4, electrostatic tar capturing pyrolysis gas purifying, and tar enrichment; 5, pyrolytic carbon is adopted for dispersion of tar, synchronous water gasreaction, and steam reforming production of hydrogen-enriched gas; 6, reaction waste residue is taken as a biomass nanometer silica preparation raw material; and 7, preparation of phenolic resin adhesive from the phenol containing waste water. According to the method, hydrogen in water is adopted to solving problems of using of biomass as an energy that hydrogen content is low and oxygen content is high; pyrolysis and steam reforming two step method is adopted to prepare hydrogen-enriched high-energy combustion gas, electric power generation and heat supply are realized; at the same time, thephenol containing waste water is enriched to produce biomass phenol base adhesive, so that environment pollution caused by chemical phenol is reduced, cost is reduced, waste is changed into valuables;by-product natural nanometer silica is obtained, and an ultra wear resistance material is provided for green aviation tyres.

Description

technical field [0001] The invention belongs to the field of biomass energy chemical industry, and specifically discloses a method for power generation and comprehensive utilization by pyrolysis of rice husk. Background technique [0002] Rice husk pyrolysis power generation has become a preferred project strongly supported by the national and local governments, and has been promoted and applied at home and abroad. Among the many pyrolysis equipment, the most widely used in the market is the downdraft pyrolysis tower. The rice husk is added from the upper part and goes down through the drying zone, pyrolysis zone, and cooling zone. To generate electricity, the pyrolytic charcoal is discharged from the bottom of the pyrolysis tower after cooling down. But there are still following problems: [0003] (1) During the pyrolysis process of rice husk, the cooling area of ​​the pyrolysis tower is immersed in the water pool, the cold water cools down, the temperature of pyrolysis g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/60C10J3/72C10J3/84C09J161/14C08G8/28C01B33/18B82Y30/00
CPCB82Y30/00C01B33/18C08G8/28C09J161/14C10J3/60C10J3/72C10J3/84C10J2300/092C10J2300/16C10J2300/1671C10J2300/1693C10J2300/1696Y02P20/10
Inventor 王晓峰杨晓敏朱燕超田玉美王子忱
Owner JILIN UNIV
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