Oxyfuel processes

Oxyfuel processes Combustion is carried out using pure oxygen, resulting in a flue gas that mainly contains water (H2O) and CO2. 

Ceramic or cermet thermal spray materials deposited by plasma spraying, detonation gun (D-gun), or high-velocity oxyfuel processes... 

A number of promising new materials exist for CO2 capture from precombustion, post-combustion, and oxyfuel processes [17]. Examples of new materials include ionic liquids (ILs), metal-organic frameworks (MOFs), membranes, and fibrous and nanofibrous sorbents (Fig. 10.1). 

In the field of electricity generation, in particular, intensive research is carried out on capture processes, as this industrial sector contributes heavily to worldwide greenhouse-gas emissions. Basically, three concepts for C02 capture in electricity generation can be distinguished post-combustion capture, pre-combustion capture and oxyfuel (see Fig. 6.1 for a detailed description of the various capture processes, see, for example, BMW A (2003) IPCC (2005)). 

Advanced Oxyfuel Boilers and Process Heaters for Cost Effective COj Capture and Sequestration. This project is to develop a novel oxy-fuel boiler to reduce the complexity of CO2 capture. 

Oxyfuel-combustion. The fuel is converted to heat in a combustion process. This is achieved with pure oxygen as an oxidiser. Mostly C02 and water vapour are produced in the flue gases, and thus C02 can be easily separated by condensing the water vapour. 

There are three main ways to capture C02 in the NGCC process post-combustion C02 capture, oxyfuel combustion, and precombustion C02 capture. 

In oxyfuel combustion, the natural gas is combusted with a concentrated oxygen stream (-95% 02). The flue gas from the combustion process is not diluted with N2 but consists of mainly C02 and steam. The steam in the flue gas can be condensed, and C02 can be sent direcly to the sequestration plant without further separation. 

OXYACETYLENE WELDING - An oxyfuel gas welding process in which the fuel gas is acetylene. 

While carbon dioxide capture technologies are new to the power industry, they have been deployed for the past 60 years by the oil, gas, and chemical industries. They are an integral component of natural gas processing and of many coal gasification processes used for the production of syngas, chemicals, and liquid fuels. There are three main carbon dioxide capture processes for power generation (1) postcombustion, (2) precombustion, and (3) oxyfuel. 

For the pre-combustion and oxyfuel capture processes, membranes based on alumina, zeolites, silica and carbon that show stability up to 300°C are generally proposed [27]. 

Commonly accepted safe practice for use of MAPP Gas is available in ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes, and AWS C4.2, Operator s Manual for Oxyfuel Gas Cutting [6, 7]. 

For gas combustion processes, the lower-energy flame spray process uses oxyfuel combustible gas as a heat source to melt the coating material, which may be in the form of rod, wire, or powder. In the higher-energy, high-velocity oxyfuel combustion spray (HVOF) technique, internal combustion of oxygen and fuel gas occurs to produce a high-velocity plume... 

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