62 results about "Negative carbon dioxide emission" patented technology

The invention discloses a solar aided carbon dioxide trapping integrated system, which mainly comprises three parts, i.e. a power generation subsystem, a carbon dioxide trapping subsystem and a solar heat collection subsystem, wherein the subsystems are connected mainly through a boiler feed water heater, a reboiler and a flue gas pretreatment device to form the whole integrated system. According to the system, the high and low energy requirements of related parts among the solar heat collection subsystem, the power generation subsystem and the carbon dioxide trapping subsystem are reasonably allocated and integrated in different connecting ways at the heat output end of the solar heat collection subsystem to realize the gradient utilization of energy, so that the energy consumption of extraction of vapor from a steam turbine of a power plant can be greatly reduced, the stability of the power plant can be maintained, the dual effects of utilizing renewable energy resources and reducing the carbon dioxide emission of the power plant are achieved, and the large-scale application of solar energy and an integrated flue gas trapping technology in China are forcefully promoted.

A reformation power plant generates clean electricity from carbonaceous material and high pressure CO₂ which can be easily sequestered or utilized for a beneficial purpose, such as fuel production. The reformation power plant design utilizes a reformation process that reforms carbonaceous fuel with super-heated steam into a high-pressure gaseous mixture that is rich in carbon dioxide and hydrogen gas. This high-pressure gas exchanges excess heat with the incoming steam from a boiler and continues onward to a condenser. Once cooled, the high-pressure gas goes through a methanol separator, after which the CO₂-rich gas is sequestered underground or beneficially re-used. The remaining hydrogen-rich gas is combusted through a gas turbine. The gas turbine provides power to a generator and also regenerative heat for the boiler. Finally, the generator converts mechanical energy into electricity, which is transferred to the electric grid. Therefore, carbon-free electricity is generated from coal, biomass, or other carbon-based feedstock.

Carbon dioxide emissions within a refinery are reduced by reforming a hydrocarbon containing feed at low pressure to enhance the conversion of methane to hydrogen and carbon monoxide and thereby reduce methane slip. The hydrocarbon containing feed is composed entirely or at least in part of a refinery off gas. The resulting reformed stream is then subjected to water-gas shift conversion to form a shifted stream from which carbon dioxide is separated. As a result of the separation and the low pressure reforming, hydrogen containing fuel gas streams, that are thereby necessary lean in carbon dioxide and methane, are used in firing the steam methane reformer and other fuel uses within the refinery to reduce carbon dioxide emissions. The carbon dioxide that is separated can be sequestered or used in other processes such as enhanced oil recovery.

An integrated coal-to-liquids process is provided to minimize carbon dioxide emissions and efficiently make use of carbon resources, by recovering carbon dioxide emissions from Coal-to-Liquids (CTL) facilities, using the recovered carbon dioxide in at least one carbonylation reaction step for converting ammonia to urea and then converting urea into dimethyl carbonate.

The present invention discloses a process method for preparing synthesis gas by using a zero carbon or negative carbon emission system. The process method comprises that: 1) first raw material gas is subjected to desulfurization, steam is matched, pressurization and heating are performed, a reaction is performed to obtain first conversion gas, the first conversion gas is output, the output first conversion gas and pure oxygen are mixed and then enter a two-stage furnace to react so as to obtain second conversion gas, and the second conversion gas is output from the two-stage furnace; 2) second raw material gas is subjected to desulfurization, pressurization and heating and then is mixed with pure oxygen and carbon dioxide, then a reforming reaction is performed to obtain third conversion gas, and the third conversion gas is output from the reforming reactor; and 3) the second conversion gas is subjected to heat recovery and then is mixed with the third conversion gas to form crude synthesis gas, wherein the crude synthesis gas is adopted as the subsequent synthesis gas with or without a decarbonization device. According to the present invention, the greenhouse gas emission is reduced, the carbon efficiency is improved, the recycling of the carbon resources of the energy source chemicals is achieved, the hydrogen-carbon ratio of the synthesis gas achieves the ideal ratio of the downstream process requirement, and the zero carbon or negative carbon emission of the whole system is achieved.

The invention provides a carbon dioxide adsorbent and a preparation method thereof. The carbon dioxide adsorbent is a metal organic skeleton containing two mixed ions, and the ions comprise iron ions and cobalt ions. The adsorbent prepared by the preparation method provided by the invention has the advantages of high adsorption capacity and high carbon dioxide selectivity, so that low-concentration carbon dioxide in flue gas can be enriched to a higher concentration so as to meet the treatment requirements of carbon dioxide waste gas in flue gas in industry, the carbon dioxide emission is reduced and the resource utilization of the carbon dioxide is realized at the same time.

A reduced carbon dioxide emission system and method for providing power for refrigerant compression and shared electrical power for a light hydrocarbon gas liquefaction process.

A six stroke high thermal efficiency engine and a method for operating such an engine are disclosed. Oxygen or oxygen-enriched air is used as the oxidizer, heat is recovered from the two exhaust strokes, superheated steam is used in the second power stroke, and high levels of exhaust gas from stroke four are recirculated. Lean burn combustion is utilized to produce an oxygen rich exhaust which results in very low levels of particulates, unburned hydrocarbons, and carbon monoxide. Due to high thermal efficiency, carbon dioxide emissions are reduced per unit of power output. Use of oxygen or oxygen-enriched air as the oxidizer produces an exhaust containing very low levels of nitrogen oxides. The engine is insulated to conserve heat, resulting in reduced engine noise. An engine with high thermal efficiency, quiet operation, and low emissions is the result.

A process for reducing CO2 emission in a power plant, wherein the power plant comprises at least one gas turbine coupled to a heat recovery steam generator unit and the CO2 capture unit comprises an absorber and a regenerator, the process comprising the steps of: (a) introducing hot exhaust gas exiting a gas turbine having a certain elevated pressure into a heat recovery steam generator unit to produce steam and a flue gas stream comprising carbon dioxide; (b) removing carbon dioxide from the flue gas stream comprising carbon dioxide by contacting the flue gas stream with absorbing liquid in an absorber having an elevated operating pressure to obtain absorbing liquid enriched in carbon dioxide and a purified flue gas stream, wherein the settings and/or construction of the gas turbine are adjusted such that the hot exhaust gas exiting the gas turbine has a pressure of at least 40% of the elevated operating pressure of the absorber.

A method for neutralizing or reducing the carbon footprint from carbon dioxide emissions due to human activities related to the combustion or use of carbon containing fuels. This method includes an initial step of capturing carbon dioxide and then chemically recycling it to form and provide a permanent inexhaustible supply of carbon containing fuels or products, which subsequently can be combusted or used without increasing the carbon dioxide content of the atmosphere. Thus, the current lifestyles that rely extensively on conventional carbon containing fuels and products can continue indefinitely without harming the environment to preserve and even improve the earth's atmosphere for the benefit of future generations.

The invention relates to a carbon reduction method for tail gas emission reduction of a coal-fired power plant, which mainly includes the steps of gas heating, carbon reduction reaction, gas cooling and gas separation. The method of converting CO2 into CO to reduce carbon dioxide emissions not only avoids the huge cost of carbon dioxide capture, transportation and landfill, but also produces CO as an important raw material for one-carbon chemical industry, which has good economic benefits and can Save a lot of gas. During the carbon reduction process, the sulfur and nitrogen oxides in the flue gas are reduced to elemental sulfur and nitrogen, and the decarbonization, desulfurization and denitrification of the flue gas are realized simultaneously, which greatly reduces the environmental protection cost of the power plant. The invention can meet the needs of carbon emission reduction in industries such as power generation, cement, steel and oil refining, especially the control and utilization of carbon dioxide emission from tail gas of coal-fired power plants.

Systems and methods of reducing carbon dioxide emissions in a fluid catalytic cracking unit having a reactor and a regenerator at gasification conditions are disclosed. In one example, a method comprises compressing a first gas at an inlet pressure to a predetermined high pressure to define a compressed gas and combusting a second gas with the compressed gas to a predetermined temperature to define a heated gas. The method further comprises expanding the heated gas to a predetermined low pressure to define a feed gas. The method further comprises introducing the feed gas to the regenerator. The feed gas, now at an elevated temperature, provides heat to the regenerator to burn coke off spent catalyst from the reactor, achieving a proportion of carbon monoxide in a flue gas. In turn, this reduces the concentration of carbon dioxide in the flue gas.

Plants, devices, and methods are presented which economically and effectively reduce carbon dioxide (CO₂) emissions from flue gases by converting heat derived from one or more sources of flue gas to drive a heat engine, which generates power, energy, and/or work that is utilized by a CO₂ capture unit coupled to the stream of flue gas. CO₂ captured from the flue gas stream may be sequestered and/or utilized for commercial purposes.

The invention discloses a negative carbon emission system and a method thereof. Carbon dioxide molecules can be fixed by growing plants through plant photosynthesis. When the wavelength of photons that cause the plant synthesis are properly designed to enhance plant photosynthesis of plants. A LED light source, whose carbon footprint is lower than a threshold value and the conversion efficiency ishigher than a threshold value, is adopted. A low carbon power supply with carbon footprint lower than a threshold value such as a solar panel is used. When the combination is realized, carbon dioxidemolecules absorbed by plants through photosynthesis are more than emitted carbon dioxide molecules, long term negative carbon emission is realized, and the system can be used to capture carbon dioxide.

A method for determining carbon emissions from a steam generation system (100) is disclosed. It includes measuring a first energy of feedwater entering into a steam generation system (100) and measuring a second energy of steam exiting the steam generation system (100). The first energy is subtracted from the second energy to determine a total energy absorbed by the steam generation system (100). The total energy absorbed by the steam generation system (100) is divided by the total energy to determine a heat input to the steam generation system (100). The heat input is used to determine the carbon emissions from the steam generation system (100).

The invention discloses a sludge treatment method based on carbon dioxide emission reduction. The method comprises the following steps: S1, selecting a certain amount of sludge to be treated, and calculating the carbon dioxide generation amount under the sludge sanitary landfill condition by taking sludge sanitary landfill as a comparison reference; step S2, based on different sludge treatment anddisposal processes, on the premise of mass balance conservation, based on each accounting boundary condition under the condition of mass conservation, calculating carbon dioxide emissions generated by all direct emissions and indirect emissions in each sludge treatment and disposal process, and carbon emission reduction caused by carbon sink generated by final energy reuse; S3, according to the carbon dioxide generation amount btained in the step S1 and the carbon dioxide emission amount obtained in the step S2, obtaining carbon dioxide emission reduction amounts of different sludge treatmentand disposal processes with requirements on emission reduction amount calculation; and S4, according to the obtained carbon dioxide emission reduction amount of each process, selecting a corresponding sludge treatment process to carry out sludge treatment.

The invention provides a biomass gasification power generation system. The biomass gasification power generation system comprises a biomass gasification subsystem and a semi-closed supercritical carbon dioxide circulation subsystem, wherein the biomass gasification subsystem comprises a feeding device, a biomass gasifier, a fuel gas purification and cooling device, an oxygen source, a gasifier oxygen feeding compressor, a combustion chamber oxygen feeding compressor, a hydraulic turbine, a fuel gas compressor and the like; and the supercritical carbon dioxide circulation subsystem comprises afirst carbon dioxide pump, a middle cooler, a second carbon dioxide pump, a heat regenerator, a combustion chamber, a turbine, a power generator, a cooler, a water separator, a condenser, a carbon dioxide collection device and the like. The invention further provides a biomass gasification power generation method. The biomass gasification power generation system is high in efficiency, semi-closedsupercritical carbon dioxide is circulated under high-temperature and high-pressure parameters, so that the power generation efficiency is high; negative carbon dioxide emissions are achieved, so thatan additional carbon capturing device is avoided; and the system is simple, compact in structure and flexible to operate, so that a small or large chimney-free biomass gasification power plant can beestablished.

The invention relates to a preparation method of a graphene oxide modified coal pitch binder, The method comprises the following steps: fully mixing coal pitch serving as a basic raw material and graphene oxide serving as an additive (in a mass ratio of 0.2-2.0%) in an inert liquid medium, separating and purifying to prepare a modified coal pitch binder, and mixing the modified coal pitch binder with a solid carbon component by kneading according to the following ratio (15-30):(70-85) and performing high-temperature roasting to obtain the carbon electrode. The method has the advantages that the oxidation resistance of the carbon electrode prepared by the graphene oxide modified coal pitch binder is improved, so that the carbon consumption during the use of the electrode can be reduced, andthe carbon dioxide emission is reduced, which will be beneficial to the protection of the ecological environment.