Biomass combustion
a biomass fuel and combustion technology, applied in the combustion process, solid fuels, fuel additives, etc., can solve the problems of reducing heat transfer and efficiency of the boiler, slag and fouling deposits are difficult to remove, and the build-up of slag and fouling deposits is controlled. , to achieve the effect of reducing the corroding effect of the surface deposits, regulating the build-up of deposits, and reducing the problem of slagging and fouling
Inactive Publication Date: 2016-02-11
DRAX POWER
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Benefits of technology
The present invention aims to solve problems caused by biomass ash such as slagging, fouling, and corrosion. The invention captures biomass ash by adhering it to the surface of mitigant particles. This is done by injecting mitigant particles into the combustion region of the furnace. The captured biomass ash can then be used to form less corrosive sulphur salts with alkali metal chlorides in the ash, reducing the risk of slag and fouling deposits. The technical effect of the invention is improved handling of biomass ash to minimize corrosion and other negative impacts on combustion systems.
Problems solved by technology
The slag and fouling deposits act as a refractory on the heat exchange surfaces and so the heat transfer and efficiency of the boiler is diminished.
The slag and fouling deposits are very difficult to remove using conventional removal methods.
Hence, the slag and fouling deposits may only be removed during a forced outage period; which is undesirable.
Also, metal chlorides within the slag and fouling deposits are highly reactive and they rapidly corrode the surfaces in the furnace and particularly in the gas pass.
Method used
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[0131]The mitigant may comprise pulverised fuel ash (PFA). Pulverised fuel ash is a by-product, formed during the combustion of pulverised coal, that is carried through the coal fired boiler by flue gasses and collected by electrostatic precipitators or other filtration apparatus. For this reason, PFA is otherwise referred to as “fly ash” or “flue ash”. To control pollution, pulverised fuel ash is typically captured and then stored, sold or disposed in landfills. Due to the substantial number of coal-fired boilers, PFA is available in large quantities. Recycling PFA to mitigate the undesirable slagging, fouling and corrosion effects of biomass ash advantageously reduces the storage / landfill cost and space.
[0132]Pulverised fuel ash is an amorphous, glassy material.
[0133]As shown in the scanning electron microscope image and corresponding schematic drawing of FIGS. 3a and 3b, pulverised fuel ash (PFA) comprises discrete, substantially spherical particles, which minimises the erosion o...
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Abstract
The present invention relates to a means and method for at least injecting mitigant particles into the combustion region (fireball) of a biomass boiler. The mitigant particles mitigate the slagging, fouling and corrosion problems caused by biomass ash by at least capturing the biomass ash. The mitigant particles capture the biomass ash by forming a physical bond with the biomass ash such that it adheres to the surface of mitigant particles. By injecting the mitigant particles into the combustion region, the opportunity to capture biomass ash is optimised.
Description
FIELD OF INVENTION[0001]The present invention relates to the combustion of biomass fuel.BACKGROUND TO THE INVENTION[0002]In an attempt to reduce greenhouse gas emissions, biomass has become an increasingly important fuel source.[0003]Biomass may be combusted in small or large scale-combustion systems. For example, biomass may be combusted in a pulverised fuel boiler (1) as depicted in FIG. 1. Biomass fuel is injected into the combustion region of a furnace (F) via burners (2). The heat generated by the combustion of biomass is used to produce superheated steam in superheaters and reheaters (3). The superheated steam is directed to rotate a turbine (not shown) and this, in turn, drives a generator (not shown) to produce electricity. In pulverised fuel boilers, combustion typically takes place at temperatures in the range of approximately 1200° C. to 1700° C.[0004]During combustion, the biomass (B) releases solid residues of biomass ash (A) as shown in the scanning electron microscope...
Claims
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IPC IPC(8): F23J7/00C10L10/04C10L10/06
CPCF23J7/00F23G2200/00C10L10/06C10L10/04F23J9/00F23G7/10F23G2201/701F23G2207/60F23K2201/501C10L2200/0484C10L2200/0469C10L9/10C10L2200/0254C10L2200/0204C10L2200/0263F23J2700/001
Inventor STRAKER, PAULSHIPSTONE, JASONNICHOLSON, ADAM
Owner DRAX POWER