The emission of sulfur dioxide (SO2, also SO3) and nitrogen oxides (NO, NO2, called NOX) from burning fossil fuel, especially coal which is used to produce energy (electricity and heat) is one of the most important sources of environmental and air pollution. These pollutants are known as "acid gases" causing acid rain and also "indirect greenhouse gases" contributing greenhouse effect. Acid rai...

In this paper, an improved system to efficiently utilize the low-temperature waste heat from the flue gas of coal-fired power plants is proposed based on heat cascade theory. The essence of the proposed system is that the waste heat of exhausted flue gas is not only used to preheat air for assisting coal combustion as usual but also to heat up feedwater and for low-pressure steam extraction. Ai...

The simultaneous removal of SO2/NO2 by limestone slurry was studied in a gas-liquid bubbling reactor. Experiments were carried out to find the effect of various operating parameters such as inlet concentration of SO2 and NO2, reaction temperature, O2 content in the flue gas and additive on the SO2 and NO2 removal efficiencies. SO2 removal efficiency decreased with inlet NO2 concentration, react...

Two important factors that affect in-stack opacity--light extinction by emitted particles and that by water moisture after a flue gas desulfurization (FGD) unit--are investigated. The mass light extinction coefficients for particles and water moisture, k(p) and k(w), respectively, were determined using the Lambert-Beer law of opacity with a nonlinear least-squares regression method. The estimat...

The flue gas of oil shale retort is characterized by high humidity, low sulfur content and tar content, which makes it impossible for traditional desulfurization facilities to deal with such normally. By collecting parameters at the inlet outlet original tower dry distillation gas, combining computational fluid dynamics numerical simulation, this paper analyzes fault reasons each step in proces...