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Languages : en
Pages : 12
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This current project is pilot-scale testing of NO(subscript x) recycle. The objective is to provide further fundamental understanding and useful information for its implementation at the Niles station. A Babcock & Wilcox's 6 million Btu/hr Small Boiler Simulator (SBS) has been chosen to perform the tests. The SBS is the same type of cyclone furnace as that at Niles and simulates a large cyclone unit very well. The project involves conducting a series of tests which include injecting NO, NO2, N2O, and simulated NO(subscript x) recycle stream respectively. The work performed during this reporting period focused on the site preparation, shakedown tests, and baseline tests. The shakedown testing of NO injection into the primary air stream alone and the secondary air stream alone showed promising results. A large amount of NO injected into furnace was destroyed, especially when the NO was injected into the primary air duct. However, the measuring instrumentation needs to be improved to give accurate data.
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Languages : en
Pages : 14
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NO{sup x} recycle represents one part of the NOXSO process. This process can remove 90% of NO(subscript x) and SO2 simultaneously from flue gas by using a fluidized bed of sorbent. Spent sorbent is regenerated by treatment at high temperatures with a reducing gas. Adsorbed NO{sub X} is evolved on heating the sorbent to a regeneration temperature. The concentrated stream of NO(subscript x) produced is returned to the boiler with the combustion air and reduced in the flame, which is called NO(subscript x) recycle. In the previous reporting period (from April to June), NO injection series of tests have been completed. Part of NO simultaneous injection and NO2 injection tests were conducted. All the test results showed consistent trends. About 70% average NO(subscript x) reduction efficiency has been achieved when NO is injected into the primary air duct, which was not affected by the NO injection flow rate, the furnace load and exit O2 concentration. When NO is injected into the secondary air duct, the NO(subscript x) reduction efficiency ranges from 46% to 60 % with dependence on the exit O2 concentration. The NO simultaneous injection tests showed that the NO(subscript x) reduction efficiency increases with the percentage of total NO injected into the primary air duct. About 67% average NO(subscript x) reduction efficiency was demonstrated with injection of NO2 into the secondary air duct, which is higher than that with injection of NO at the same test conditions.
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Languages : en
Pages : 8
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All the tests planed were completed. NO2 injection tests showed higher NO(subscript x) reduction than that of NO injection at similar testing conditions. The NO(subscript x) reduction efficiency for the NO/NO2 mixture injection is higher than that for NO injection and lower than that for NO2 injection separately. The NO(subscript x) reduction efficiency is independent on the amount of injected gas (NO, NO2, or NO/NO2), but affected by the exit O2. The optimum injection location which gives higher NO(subscript x) reduction efficiency is the primary air duct. The NO(subscript x) reduction efficiency increases with the percentage of total NO injected into the primary air duct when injecting NO into both primary air duct and secondary air duct simultaneous.
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Languages : en
Pages : 20
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NO(subscript x) recycle is one part of the NOXSO process. In this process, 90% of the acid pollutants (NO(subscript x) and SO2) can be removed simultaneously by adsorption on the surface of a PO sorbent material. The sorbent is subsequently regenerated by heating and contacting the hot sorbent with a reducing gas followed by steam. The NO(subscript x) is removed in the heating process, and the SO2 is removed by the chemical reaction of the reducing gas and steam. The NO (subscript x) stream produced is returned to the combustion process with combustion air, which is called the NO(subscript x) recycle. The NO(subscript x) is reduced in the flame to N2, H20, and CO2. NO(subscript x) recycle will be implemented at the full-scale commercial demonstration plant at Niles. The concept of NO(subscript x) recycle has been tested previously at DOE-Pittsburgh Energy Technology Center (PETC) using a 500 lb/hr coal combustor used for the 3/4 MW tests and also using a tunnel furnace capable of being fired with a variety of fuels including gas, fuel oil, coal, and coal-water mixtures. The results were very promising and demonstrated the destruction of NO(subscript x) compounds when fed to the combustion system. The data also indicate that the extent of NO(subscript x) reduction is determined by the location of the NO(subscript x) injection and the combustor design. This current project is pilot-scale testing of NO(subscript x) destruction mechanisms and to help with the implementation at the Niles station.
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Category :
Languages : en
Pages : 21
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Book Description
NO(subscript x) recycle is one part of the NOXSO process. In this process, 90% of the acid pollutants (NO(subscript x) and SO2) can be removed simultaneously by adsorption on the surface of a sorbent material. The sorbent is subsequently regenerated by heating and contacting the hot sorbent with a reducing gas followed by steam. The NO(subscript x) is removed in the heating process, and the SO2 is removed by the chemical reaction of the reducing gas and steam. The NO(subscript x) stream produced is returned to the combustion process with combustion air, which is called the NO(subscript x) recycle. The NO(subscript x) is reduced in the flame to N2, H2O, and CO2. The tests of NO injection with combustion have demonstrated very promising results. The test data showed quite consistent NO(subscript x) reduction efficiencies, which is similar to the previous test results on the pulverized coal combustor at DOE-PETC. An average of about 70 % NO. destruction efficiency was achieved for the NO injection into the primary air duct independent of injected NO flow rates and exit 02 concentrations. About 58%, 50%, and 46% average destruction efficiencies were obtained for the NO injection into the secondary air duct corresponding to the exit O2concentrations of 2%, 3%, and 4% respectively.
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Category :
Languages : en
Pages :
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Author:
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Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 150
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Book Description
NO(subscript x) recycle represents one part of the NOXSO process. This process can remove 90% of NO(subscript x) and SO2 simultaneously from flue gas by using a fluidized bed of sorbent. Spent sorbent is regenerated by treatment at high temperatures with a reducing gas. Adsorbed NO(subscript x) is evolved on heating the sorbent to a regeneration temperature. The concentrated stream of NO(subscript x) produced is returned to the boiler with the combustion air and reduced in the flame, which is called NO(subscript x) recycle. The concept of NO(subscript x) recycle has been experimentally evaluated at the US Department of Energy's Pittsburgh Energy Technology Center (PETC). NO(subscript x) destruction has been demonstrated on a 500 lb/hr pulverized coal combustor and a 1.7 MMBtu/hr tunnel furnace combustor firing both natural gas and coal-water slurry. The NO(subscript x) recycle experimental study discussed in this report and performed on Babcock & Wilcox (B & W)'s six MMBtu/hr Small Boiler Simulator (SBS) is a pilot-scale test. The objective is to provide further fundamental understanding and necessary information for the NOXSO full-scale demonstration at Ohio Edison's Niles Power Plant which uses the same type of cyclone burners. The experimental testing included injection of NO, NO(subscript x) and different combinations of NO/NO2 with tile primary air (PA) and secondary air (SA) to the combustor. Results are consistent with earlier test data obtained on PETC's facility and will be used for the design of the NOXSO commercial demonstration plant at Niles.
Author:
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Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
This current project is pilot-scale testing of NO(subscript x) recycle. The objective is to provide further fundamental understanding and useful information for its implementation at the Niles station. A Babcock Wilcox's 6 million Btu/hr Small Boiler Simulator (SBS) has been chosen to perform the tests. The SBS is the same type of cyclone furnace as that at Niles and simulates a large cyclone unit very well. The project involves conducting a series of tests which include injecting NO, NO2, N2O, and simulated NO(subscript x) recycle stream respectively. The work performed during this reporting period focused on the site preparation, shakedown tests, and baseline tests. The shakedown testing of NO injection into the primary air stream alone and the secondary air stream alone showed promising results. A large amount of NO injected into furnace was destroyed, especially when the NO was injected into the primary air duct. However, the measuring instrumentation needs to be improved to give accurate data.
