6results about How to "Improve carbon conversion" patented technology

This invention discloses a method for preparing and applying algal hydrothermal char material. Algae are mixed with a reaction medium at a solid-liquid ratio of 50-100 g / L. After thorough stirring, the mixture is reacted under autogenous pressure and at a temperature of 130-150°C for 3-5 hours. After the reaction, the mixture is filtered, washed, dried, and ground to obtain the algal hydrothermal char material. The reaction medium is a mixed solution of ammonium phosphate and ammonia. The prepared algal hydrothermal char material can be used to improve the saline-alkali geochemical properties, reduce pH and salinity, and ultimately increase crop yield.

A coal chemical gasification process for reducing the residual carbon content of fine slag includes: a gasifier vertically designed from top to bottom as a combustion chamber, a Boudouar reaction chamber, a downcomer, and a quench chamber; molten slag drips directly from the combustion chamber into the quench chamber via the downcomer, without passing through the Boudouar reaction chamber; high-temperature syngas from the combustion chamber directly enters the Boudouar reaction chamber from its lower side wall outlet; a portion of the CO2 removed by the purification unit is preheated and pressurized before being injected into the Boudouar reaction chamber; during the process of the high-temperature syngas entering the Boudouar reaction chamber, the residual carbon in the high-temperature syngas is fully stirred and comes into full contact with CO2, resulting in a Boudouar reaction; after entering the Boudouar reaction chamber, it undergoes another Boudouar reaction with the injected CO2; the high-temperature syngas after the reaction in the Boudouar reaction chamber enters the downcomer from the bottom outlet, and then enters the quench chamber for rapid cooling and dust removal. This process significantly improves carbon conversion rate and effective gas production rate without affecting the stability of liquid slag discharge from the gasifier, and reduces CO2 emissions. It has the advantages of low energy consumption, high gasification efficiency, good system stability, significant environmental benefits, and minimal investment increase.

This invention belongs to the field of materials science, specifically disclosing an electrocatalyst, its preparation method, and its application. The electrocatalyst of this invention comprises a copper layer, a copper nanosheet array, and a quaternary ammonium salt polymer; the copper nanosheet array is disposed on the surface of the copper layer; the copper nanosheet array is composed of arranged copper nanosheets; the quaternary ammonium salt polymer is distributed on the surface of the copper nanosheets and between adjacent copper nanosheets. The electrocatalyst of this invention uses a quaternary ammonium salt polymer supported on the surface of and between the copper nanosheets, enabling the electrocatalyst to possess a robust and efficient gas-liquid-solid three-phase interface in a strongly acidic medium, effectively improving the selectivity, carbon conversion rate, and operational lifespan of the electrocatalyst for CO2 reduction.

This invention discloses an operation control method for a CO₂ circulating catalytic biomass gasification polygeneration unit, relating to the field of distributed biomass energy utilization and process control technology. The method includes the following steps: inerting and purging are performed based on the gas supply and atmosphere control unit to determine the unit's operating boundaries; during the pyrolysis stage, active sites are constructed in situ on the carbon through alkali metal Na / K dosage control; during the gasification stage, recycled CO₂ and / or purified flue gas are introduced and the CO₂ / steam ratio is controlled to drive the reaction unit to stably produce gas and generate biochar as a byproduct; tar and dust are controlled through staged condensation-filtration-switchable catalytic cracking; a micro gas chromatography calibration dataset is established and sensor array data is fused; soft measurement and closed-loop control are used to adjust the feed rate, bed temperature, and recycled CO₂ ratio; and emergency shutdown is executed when safety interlock conditions such as backfire, CO leakage, and pressure difference abnormalities are triggered. This method solves the problems of large calorific value fluctuations, easy tar blockage, and high monitoring and control costs in distributed biomass gasification, achieving improved efficiency and safe and stable operation.

The application provides a high-pressure jet granulation device for slag of a slag gasifier, and belongs to the field of slag granulation.The device comprises a gasifier, a granulation chamber and a jet assembly.The metallurgical slag is input into the gasifier from a feeding port, the gasifier converts the metallurgical slag into coal gas and slag, and the gasifier is provided with a jet pipe which is inserted into the metallurgical slag.The top of the granulation chamber is connected with a slag discharge port, the molten slag falls into the granulation chamber, the bottom of the granulation chamber is provided with a slag discharge port, and the side of the granulation chamber is connected with a gas discharge pipe.The jet assembly sprays high-pressure jets to the molten slag flow, so that the molten slag is converted into granulated slag and high-temperature gas, the granulated slag is discharged from the slag discharge port, and the high-temperature gas is discharged from the gas discharge pipe.The jet assembly sprays high-pressure jets to the molten slag flow, so that the molten slag flow is fully granulated under the impact of the high-pressure jets, the granulated slag is small and uniform in size, the high-pressure jets are rapidly converted into high-temperature gas after being contacted with the high-temperature molten slag flow, and the high-temperature gas is discharged from the gas discharge pipe and can be used through backflow.

The invention belongs to the technical field of catalysts and application thereof, and particularly relates to a superlattice catalyst for electrocatalytic reduction of carbon dioxide as well as a preparation method and application of the superlattice catalyst. The superlattice catalyst is of a multi-layer film structure formed by alternately overlapping a metal A nano film and a metal B nano film, and the superlattice catalyst forms a potential gradient and a directional potential well at an interface; the metal A is copper; and the metal B is silver. On a three-dimensional conductive substrate, two kinds of metal are alternately deposited and prepared through the physical vapor deposition technology. The superlattice catalyst can be used for electrocatalytic reduction of carbon dioxide, the faraday efficiency of a C2 product exceeds 70%, and the faraday efficiency of ethanol is up to 61%. The preparation method of the superlattice catalyst is simple, the catalytic reduction efficiency of carbon dioxide is high, and the selectivity of a target product is high.