Biochar Preparation via Solid Solution Charring with Active Agent
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Solution Overview
Problem
Conventional biomass conversion to biochar via torrefaction has a low conversion rate of 30% to 40%, leading to energy wastage and environmental pollution, due to inefficient charring processes.
Innovation Solution
A method involving the use of an active group-containing active agent and a catalyst in a solid solution charring process, where pre-crushed biomass is heated with a specific mass ratio of catalyst and active agent, and then cooled to produce biochar, optimizing the charring conversion temperature and pressure to enhance biochar production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional torrefaction technique is used for biomass charring, then the process is simple and easy to operate, but the conversion rate of biomass into biochar is only 30% to 40%, causing energy wastage and environmental pollution
Solution Approach 1:
The patent introduces an active agent containing carboxyl groups as an intermediary substance that mediates between the biomass and catalyst. This active agent facilitates the charring process by enhancing the interaction between biomass and catalyst, thereby improving biochar conversion rate from 30-40% to above 50% without significantly complicating the overall process
Solution Approach 2:
The patent optimizes specific parameters including the mass ratio of biomass to catalyst (90:10 to 99:1), the mass percentage of biomass in the active agent (1-5%), temperature range (200-800°C), and pressure conditions (0.01-10.0 MPa). These parameter changes enable high conversion rates while maintaining process feasibility
2Object-affected harmful factors
If conventional torrefaction is used, then the process requires minimal equipment, but it produces tar and combustible gas (CO, CH4) leading to environmental pollution and energy loss
Solution Approach 1:
The patent converts the harmful effect of tar and combustible gas production into a benefit by using the catalyst and active agent to redirect the decomposition pathways. The catalyst promotes selective breakdown of biomass components, converting potential pollutants into useful biochar and controllable gas products, thereby reducing environmental pollution while improving energy efficiency
Solution Approach 2:
By controlling temperature (200-800°C) and pressure (0.01-10.0 MPa) parameters, the patent minimizes the formation of tar and unwanted combustible gases. The optimized conditions ensure that biomass decomposition produces primarily biochar with reduced harmful byproducts, addressing both pollution and energy efficiency concerns
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly improves the biochar conversion rate, reduces side reactions, and makes the process environmentally friendly by effectively inhibiting volatile component precipitation and increasing fixed carbon content in biochar.
Implementation Method 1
putting an active group-containing active agent containing 1% to 5% by mass of biomass and a catalyst containing 1% to 10% by mass of biomass into the reactor to perform solid solution charring on the biomass
Implementation Method 2
heating the reactor to a certain temperature and pressure, and putting an active group-containing active agent containing 1% to 5% by mass of biomass and a catalyst containing 1% to 10% by mass of biomass into the reactor to perform solid solution charring on the biomass
Data Source
AI summary
A method for preparing biochar, including steps as follows: dosing: putting pre-crushed biomass into a reactor; charring conversion: heating the reactor to a certain temperature and pressure, and putting an active group-containing active agent containing 1% to 5% by mass of biomass and a catalyst containing 1% to 10% by mass of biomass (or putting the catalyst first and then putting the active agent) into the reactor to perform solid solution charring on the biomass; and cooling: after the charring conversion is completed, cooling the reactor to 40° C. or lower to obtain the biochar. Feedstocks are abundant and cheap, farmland biomass waste is reused, and the active group-containing active agent is added in biomass charring, which can effectively inhibit side reactions and coordinate with the catalyst to perform solid solution charring on the biomass, thereby improving a biochar conversion rate and making the charring process clean and environmentally friendly.