12results about How to "Improve carbon conversion" patented technology

A device and method for producing hydrogen by biomass gasification, relating to the technical field of producing hydrogen by biomass gasification, comprises a gasifier, a primary cyclone separator, a cracking furnace, a heat recovery device, a secondary cyclone separator, a filter, a water washing unit, a desulfurization unit, a conversion unit, a pressure swing adsorption unit, a return device, a steam drum, an ash hopper I and a fly ash cooler; a distribution plate is arranged in the gasifier, and a biomass feed port is arranged above the distribution plate; a slag discharge ring pipe is connected at the central notch of the cone bottom of the distribution plate of the gasifier, and a gasifying agent nozzle is arranged in the slag discharge ring pipe; a gasifying agent inlet is arranged in the gas chamber area of ​​the gasifier; a dense phase section and a dilute phase section are arranged from bottom to top above the distribution plate of the gasifier; the top outlet of the gasifier is connected with the inlet of the primary cyclone separator, and the scheme greatly increases the primary conversion efficiency of the fly ash, and correspondingly reduces the invalid fly ash circulation amount between the gasifier and the primary cyclone separator.

The invention discloses a spinel oxygen carrier with the capability of deeply releasing lattice oxygen as well as a preparation method and application thereof, and belongs to the related technical field of hydrogen energy preparation. Elements such as Cu, Mn, Ni, Ca, Sr and the like are doped into a metal iron-based oxygen carrier AFe2O4 with a spinel type structure according to an equal molar ratio, a dilution effect is shown on A-site atoms of the spinel type oxygen carrier AFe2O4 by virtue of multiple metal elements, and a multi-metal effect for promoting lattice oxygen release is combined. In addition, the spinel type oxygen carrier (AFe2O4) has excellent adsorption capacity and cycling stability, and the novel oxygen carrier is applied to chemical looping hydrogen production (CLR) to realize recycling of waste plastics and efficient preparation of high-purity hydrogen. Therefore, the problems of insufficient activity, serious surface carbon deposition, poor cycling stability and the like of a pure Fe2O3 oxygen carrier in chemical looping hydrogen production (CLR) are solved.

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.

The present invention discloses a non-metallic phosphorus-doped lanthanum iron-based perovskite oxygen carrier, a preparation method and an application thereof. The general formula of the oxygen carrier is LaFe 1‑x P x O3. In the biomass gasification stage, the non-metallic phosphorus-doped lanthanum iron-based perovskite oxygen carrier exchanges heat and mass with the biomass, and the lattice oxygen in the non-metallic phosphorus-doped lanthanum iron-based perovskite oxygen carrier partially oxidizes the biomass to generate synthesis gas, while the non-metallic phosphorus-doped lanthanum iron-based perovskite oxygen carrier is reduced to generate a reduced oxygen carrier; in the oxidation stage, the reduced oxygen carrier reacts with oxygen in the air to achieve oxygen replenishment and restores to the structure before the reaction with the biomass, thereby achieving the cyclic regeneration of the oxygen carrier. The oxygen carrier can effectively improve the surface acidity of the oxygen carrier, and adjust its surface reactivity and lattice oxygen migration ability.

The present invention discloses a device and method for preparing adjustable synthesis gas by two-stage adsorption enhancement of organic solid waste, the device comprising a catalyst regeneration reactor, a gas supply device, an organic solid waste bin, a pyrolysis / gasification reactor, a water vapor pipeline and an adsorption catalytic reforming reactor. Through the disclosed method for preparing adjustable synthesis gas by two-stage adsorption enhancement of organic solid waste, hydrogen-rich gas and CO-rich gas are obtained in two stages respectively, the regeneration of Ca-based bifunctional catalyst and the on-site utilization of CO2 are synergistically achieved, the carbon conversion rate and synthesis gas yield of the adsorption-enhanced gasification reaction are improved, and the problem that the synthesis gas produced by pyrolysis / gasification cannot be directly used for the synthesis of downstream products is solved. The method can be widely applied to the field of pyrolysis and gasification of organic solid waste, and has a broad application prospect.

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.

The invention belongs to the technical field of metallurgy and coal chemical industry, and particularly relates to a nozzle for coal gasification suspension melting ironmaking, which comprises a gasifying agent pipe, a first cooling water outer pipe, a pulverized coal outer pipe, a mineral powder outer pipe and a second cooling water outer pipe which are sequentially arranged from inside to outside, an inner cavity of the gasifying agent pipe is a gasifying agent channel, a cavity between the gasifying agent pipe and the first cooling water outer pipe is a first cooling water channel, a cavity between the first cooling water outer pipe and the pulverized coal outer pipe is a pulverized coal channel, and a cavity between the pulverized coal outer pipe and the mineral powder outer pipe is a mineral powder channel. And a cavity between the mineral powder outer pipe and the second cooling water outer pipe is a second cooling water channel. The device is provided with the gasifying agent channel, the pulverized coal channel and the mineral powder channel, the atomization effect on a gasifying agent, pulverized coal and mineral powder can be improved, and then the gasification reaction rate of the pulverized coal and the reduction reaction rate of the mineral powder are increased.

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 utility model relates to the field of biomass gasification, in particular to an efficient and clean biomass gasification treatment process system. Comprising a gasification treatment process device, a balance bin, a feeding bin and a gasification furnace are arranged on the gasification treatment process device, an upper slag hopper and a lower slag hopper are arranged at the bottom of the gasification furnace, a high-temperature cyclone separator is arranged on the right side of the gasification furnace, a secondary reactor is arranged on one side of the high-temperature cyclone separator, and the secondary reactor is connected with a waste heat boiler. A steam cooling tank is arranged on the waste heat boiler, the right side of the waste heat boiler is connected with an efficient dust remover, the efficient dust remover is connected with a water washing tower, and crude synthesis gas generated by reaction is discharged from the top of the water washing tower. The energy utilization efficiency of the gasification device is effectively improved, and the operation safety, reliability and economical efficiency of the gasification device are improved.

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.