Numerical calculations of the WR-40 boiler with a furnace jet boiler system

Hernik, Bartłomiej

doi:10.1016/j.energy.2015.05.137

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…At the same time, the injection of 40% urea water solution is realized to meet the objectives of selective non-catalytic reduction. The combustion chamber is equipped with jet blowers (Figure 1) whose location was determined based on temperature measurements, numerical calculations [50] and previous experience [51]. The number of jet blowers and their arrangement on the boiler walls can vary depending on the boiler specification.…”

Section: Methodsmentioning

confidence: 99%

Combined NOx and NH3 Slip Reduction in a Stoker Boiler Equipped with the Hybrid SNCR + SCR System FJBS+

et al. 2021

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The application of secondary NOx control methods in medium to low-capacity furnaces is a relatively new topic on the energy market and thus requires further research. In this paper, the results of full-scale research of SNCR and hybrid SNCR + SCR methods applied into a 29 MWth solid fuel fired stoker boiler is presented. The tests were performed for a full range of boiler loads, from 33% (12 MWth) to 103% (30 MWth) of nominal load. A novel SNCR + SCR hybrid process was demonstrated based on an enhanced in-furnace SNCR installation coupled with TiO2-WO3-V2O5 catalyst, which provides extra NOx reduction and works as an excess NH3 “catcher” as well. The performance of a brand-new catalyst was evaluated in comparison to a recovered one. The emission of NOx was reduced below 180 mg NOx/Nm3 at 6% O2, with ammonia slip in flue gas below 10 mg/Nm3. Special attention was paid to the analysis of ammonia slip in combustion products: flue gas and fly ash. An innovative and cost-effective method of ammonia removal from fly ash was presented and tested. The main idea of this method is fly ash recirculation onto the grate. As a result, ammonia content in fly ash was reduced to a level below 6.1 mg/kg.

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Section: Methodsmentioning

confidence: 99%

Combined NOx and NH3 Slip Reduction in a Stoker Boiler Equipped with the Hybrid SNCR + SCR System FJBS+

et al. 2021

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“…Studies have been carried out on the formation mechanism of high-temperature corrosion and corrosive gas distribution in furnaces. − Through numerical simulation calculations of a 550 MW e tangentially fired furnace, Al-Abbas et al , analyzed the relationship between the CO distributions obtained from simulation and the actual operation condition. Hernik − found that decreasing the angle for secondary air in the burner increases the O 2 flow rate and reduces the CO at the outlet of a wall-arranged fired furnace. Most of the studies on boiler combustion focused not on CO but H 2 S, because CO is indicative of the reducing environment, which is normally referred to the atmosphere where CO concentration is high (>3%) and O 2 is low (<0.5%) accompanied by some H 2 S. Costa and Azevedo measured the CO concentration in an actual industrial pulverized-coal-fired furnace to assess the combustion condition after installing new overfire-air (OFA) ports.…”

Section: Introductionmentioning

confidence: 99%

Effects of Near-Wall Air Application in a Pulverized-Coal 300 MW_e Utility Boiler on Combustion and Corrosive Gases

et al. 2017

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The near-wall air (NWA) technology is effective for resolving the high-temperature corrosion on water tube walls in large-scale utility boilers. A numerical investigation was performed to study the effect of NWA on combustion and hightemperature corrosion in an opposed firing pulverized-coal 300 MW e utility boiler. The consistency between the in situ measured and simulated CO distribution tendencies proved that the current simulation methods were reliable and appropriate. NWA not only reduced the peaks of the CO and H 2 S concentrations but also significantly decreased the zone with high CO and H 2 S near the side walls. The NWA injection weakened the reducing atmosphere on the side wall by 40%. NWA presented a slight impact on the gas temperature and the nitrogen oxide (NO x ) concentration at the furnace outlet and led to an obvious increase in unburned carbon. The flow ratio of the NWA was analyzed from 3% to 12%. Considering the unburned carbon, CO, and H 2 S distribution, the appropriate NWA ratio was approximately 6%. High NWA ratio was beneficial to the reduction of the corrosive gases near the side walls. However, this reduction resulted in an increase in unburned carbon. A serious increase in CO and H 2 S concentration was observed in the ash hopper zone near the side wall when the NWA ratio exceeded 9%. This increase was caused by the growth of the recirculation zone in the ash hopper near the side walls, which resulted in high temperature and low O 2 concentration.

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Reduction of nitrogen oxide emissions

Pronobis¹

2020

Environmentally Oriented Modernization of Power Boilers

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Numerical calculations of the WR-40 boiler with a furnace jet boiler system

Cited by 7 publications

References 10 publications

Combined NOx and NH3 Slip Reduction in a Stoker Boiler Equipped with the Hybrid SNCR + SCR System FJBS+

Combined NOx and NH3 Slip Reduction in a Stoker Boiler Equipped with the Hybrid SNCR + SCR System FJBS+

Effects of Near-Wall Air Application in a Pulverized-Coal 300 MW_e Utility Boiler on Combustion and Corrosive Gases

Reduction of nitrogen oxide emissions

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Numerical calculations of the WR-40 boiler with a furnace jet boiler system

Cited by 7 publications

References 10 publications

Combined NOx and NH3 Slip Reduction in a Stoker Boiler Equipped with the Hybrid SNCR + SCR System FJBS+

Combined NOx and NH3 Slip Reduction in a Stoker Boiler Equipped with the Hybrid SNCR + SCR System FJBS+

Effects of Near-Wall Air Application in a Pulverized-Coal 300 MWe Utility Boiler on Combustion and Corrosive Gases

Reduction of nitrogen oxide emissions

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Product

Resources

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Effects of Near-Wall Air Application in a Pulverized-Coal 300 MW_e Utility Boiler on Combustion and Corrosive Gases