Abstract:
Methods involve adding sorbent components, such as calcium oxide, alumina, and silica, as well as optional halogens as part of environmental control. Use of the sorbents leads to significant reductions in sulfur and mercury emissions that otherwise would result from burning coal. Use of the sorbents leads to production of waste coal ash that, while higher in mercury, is nevertheless usable as a commercial product because the mercury in the ash is non-leaching and because the coal ash has a higher cementitious nature by virtue of the increased content of the sorbent components in the ash. Thus, the methods involve adding powders having qualities that lead to the production of a cementitious coal ash while at the same time reducing emissions from a coal burning facility.
Abstract in simplified Chinese:一种减少燃烧源之污染之方法及其系统,用以隔离及/或减少工业废弃流体流中的硫氧化物、氮氧化物、及/或二氧化碳。固态颗粒物质包含熔渣成分、黏结剂成分(不同于熔渣成分)、以及可选择性地加入的水所组成,并且此固态颗粒物质在与流体流接触后,令硫氧化物、氮氧化物、及/或二氧化碳至少其中之一的含量在流体流中减少。固态颗粒物质与流体流之接触系发生于具有固态颗粒物质之填充床反应器内。
Abstract:
A power plant may include a furnace, a coal supply, and a sorbent supply. The furnace may have at least one face with a distribution of a plurality of injectors. The coal supply may be in communication with the furnace. The injectors may be in communication with the source of sorbent and provide injection thereof into the furnace. The sorbent may include an alkaline powder having at least one calcium compound, silica, and alumina.
Abstract:
The use of the cementitious ash in building products as total or partial replacement for Portland cement results in reduced carbon dioxide emissions that would otherwise result form the manufacture of Portland cement. In addition to avoided carbon dioxide emissions from calcining of limestone to make Portland cement and the burning of fossil fuels to provide the energy needed to make Portland cement, use of the sorbent components tends to increase the efficiency of energy production from burning of coal, further reducing greenhouse emissions from the burning of fossil fuel to produce energy.
Abstract:
Sulfur emissions from combustion of coal and other fuels are reduced by using sugar beet lime as a sorbent during the coal burning process. In various embodiments, the sugar beet lime is added onto the coal before combustion, along with the coal into the furnace, is injected directly into the fire coal, or is added into the flue gases downstream of the furnace. The relatively high calcium content of the sugar beet lime leads to efficient sulfur capture at suitably low treat levels. Excess ash is avoided in the process.