Rates of reaction of SO2 with metal oxides
28
Citation
3
Reference
10
Related Paper
Citation Trend
Abstract:
Abstract Rates of sorption of SO 2 from synthetic flue gas by 14 metal oxides were determined. These oxides had been selected for their potential applicability to processes for removing SO 2 from flue gas using thermal regeneration of sorbent. Measurements were performed using thermogravimetric analysis, and rates were fitted to semi‐empirical expressions; CeO 2 , Co 3 O 4 , Cr 2 O 3 , CuO, Fe 2 O 3 , and NiO displayed measurable rates in the range 200° to 500°C, and were converted to sulphates. Rates were immeasurably small at 25° to 800°C for Al 2 O 3 , Sb 2 O 5 , SnO 2 , TiO 2 , V 2 O 5 , WO 3 , ZnO, and ZrO 2 , CuO and CeO 2 showed the highest ratesKeywords:
Non-blocking I/O
Thermogravimetric analysis
Flue
Flue gas treatment technology for NOχ control is required to treat the flue gases from complicated and wide varieties of fuels and combustion systems. The properties of flue gases influence on NOχ control in various ways.In this paper, these influences on NOχ control are classified discussed and several countermeasures against these influences are presented.
Flue
Cite
Citations (1)
Flue
Cite
Citations (1)
Abstract The orthogonal experimental design with CFD simulation was carried out to simulate combustion in the coke oven vertical flue at external flue gas recirculation. The control of nitrogen oxides (NO x ) generation was analysed by different factors such as air excess coefficient, oxidant preheating temperature, flue gas recirculation and oxidizer inlet cross-sectional area ratio. The simulation results showed that the the orthogonal experimental design with CFD had a significant effect on the combustion process. The flue gas recirculation ratio effectively improved the temperature distribution uniformity in the vertical flue, and had a significant effect on NO x production in the vertical flue. Within the parameters of the orthogonal design, when the air excess coefficient was 1.1, the oxidant preheating temperature was 1200 K, the flue gas recirculation ratio was 30%, and the oxidant inlet cross-sectional area ratio was 0.5, the NO x production in the coke oven vertical flue was the smallest, lower than the industry emission standard.
Flue
Coke oven
Air preheater
Cite
Citations (1)
The first Water-cooled grates system, the most important key technology for Next generation stoker incinerator, was applied to an existing commercial waste incineration plant in Japan to demonstrate its operation performance Following results were confirmed for one-year incineration operation. (1)Surface temperature of the gates could be kept less than 70 degree-C and the long term stabilized incineration was confirmed by a sufficient cooling effect. (2)Abrasion loss of the gates was less than 0.5 mm for one-year operation and excellent durability was confirmed. (3)Stable operation with 8% O2 concentration in the flue gas at SCR outlet was confirmed with flue gas recirculation. (4)CO concentration in the flue gas could be kept at a low level sufficiently by mixing effect of flue gas recirculation as a part of secondary combustion air. (5)15% reduction of the flue gas emission was confirmed in case of flue gas recirculation.
Flue
Cite
Citations (0)
Aimed at the problem of flue gas temperature deviation in horizontal flue and taking a 300 MW/1 025 t/h boiler as prototype to perform cold model tests of the whole boiler, the flue gas flow in upper furnace, horizontal flue and reversal chamber are simulated; and then the condition of flue gas speed field resulting in flue gas temperature deviation in horizontal flue and distribution characteristics of backward flue gas flow, are clarified.
Flue
Air preheater
Cite
Citations (2)
The effects of flue gas and outer wall temperature on the ash deposition characteristics of heating surface tubes during the combustion of three different coals were experimentally investigated on a 3 MW pulverized-coal combustion test rig,including two high sodium coals from Xinjiang and one non-high-sodium coal.Results indicate that the flue gas and outer wall temperature can significantly impact the ash deposition characteristics of the test section,which is closely related to the melting point of all kinds of sodium compounds in flue gas.When the flue gas temperature is 520 ℃(lower than the lowest melting point of various sodium compounds in flue gas),the ratio of the heat transfer coefficient Rhalmost does not change with time,which is approximately equal to 1.When the flue gas temperature is higher than 650℃,the Rh of the test section reduces gradually with the extension of time,and the higher the flue gas temperature is,the faster the Rhfalls.
Flue
Deposition
Pulverized coal-fired boiler
Cite
Citations (1)
The paper makes an analysis of the common problems of the flue gas duct arrangement at the ESP inlet and outlet in the 1 000 MW power plant projects.According to computer simulation results,an optimized arrangement scheme is proposed which can not only assure the uniform distribution of flue gas in three chambers of ESP but also can shorten the flue gas duct.
Flue
Power unit
Cite
Citations (0)
To solve the problems of high NOx emissions and regulation of carbon oxides in coke ovens, a MILD combustion mechanism was developed in the vertical flue. By comparing with the mixed gas technology (MGT), the low calorific gas technology (LCGT) and the low oxygen combustion technology (LOCT) were applied to the coke oven flue. By adjusting the ratio of flue gas to fuel gas (β) and the ratio of flue gas to air (γ), the Synergistic Regulation of Carbon and Nitrogen (SRCN) in the MILD-NCOF was realized. With the adjustment of β and γ, the emission of nitrogen oxides and carbon oxides was reduced. When β was 3.2, the NOx concentration at the outlet was reduced to 148.64mg/m3, and the total mole fraction of CO and CO2 at the primary and secondary discrimination interfaces was reduced to 1.252×10-1. When γ was 0.6, the NOx concentration at the outlet was reduced to 142.73 mg/m3, and the total mole fraction of CO and CO2 was reduced to 1.242×10-1. In the above cases, the MILD-NCOF could meet the design criteria for the wall temperature and realize the SRCN.
Flue
Carbon fibers
Fraction (chemistry)
Mole fraction
Air preheater
Cite
Citations (0)
Semicoke-based sorbent for flue gas cleaning was prepared from wasted semicoke material with nitric acid activation and high temperature treatment. The denitration performance of this sorbent was investigated under different simulated flue gases using a tubular reactor. The results showed that the sorbent had a good denitration capacity and efficiency. The surface physicochemical properties of the sorbent were analyzed by BET (Brunauer Emmett and Teller), transmission electron microscope, and Temperature Programmed Desorption. Heat treatment and nitric acid activation could enlarge the surface area and the pore volume obviously. Experiments with different adsorptive concentrations show that oxygen in flue gas played a positive role in nitrogen oxides removing progress, while the existence of water vapor and sulfur dioxide in flue gas had some negative influences. Heat treatment and nitric acid activation could result in great change of the surface physicochemical properties and increase the adsorption performance of the wasted semicoke material. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 394–400, 2015
Nitric acid
Specific surface area
Cite
Citations (3)
A review of the various promoters and sorbents examined for the removal of mercury from flue gas is presented. Commercial sorbent processes are described along with the chemistry of the various sorbent-mercury interactions. Novel sorbents for removing mercury from flue gas are suggested. Since activated carbons are expensive, alternate sorbents and/or improved activated carbons are needed. Because of their lower cost, sorbent development work can focus on base metal oxides and halides. Additionally, the long-term sequestration of the mercury on the sorbent needs to be addressed. Contacting methods between the flue gas and the sorbent also merit investigation.
Mercury
Elemental mercury
Flue
Cite
Citations (48)