Abstract
Kemira Ince Limited are saving Pound 260,000/year in energy costs as a result of modifications to the heat recovery train on one of their older, 450 te/day nitric acid plants at their site at Ince near Chester in the U.K. The installed cost of the project was Pound 620,000 giving a simple payback period of 2.6 years after allowing for maintenance costs. The company produces a range of ammonia-based products, including large quantities of nitric acid. Nitric acid production is a highly exothermic process. Heat is recovered by cooling the process gases which leave the ammonia burner, to around 200{sup o}C. This project increased the amount of heat recovered, first at 180{sup o}C, by additional boiler feedwater pre-heating, then at around 140{sup o}C in a novel design of coil heat exchanger. The exchanger operates in an acid condensing regime, which pre-heats the demineralised water make-up to the deaerator. Other heat recovery measures included using an additional heat exchanger to recover heat from contaminated condensate, and reducing the operating pressure of the tail gas boiler. These measures produced an additional 6 te/h of steam, principally at 3.5 bar, resulting in a fuel saving at the central boiler plant of 17 GJ/h.
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Citation Formats
None.
Heat recovery on a nitric acid plant. A demonstration at Kemira Ince Ltd., Ince, Chester (GB).
United Kingdom: N. p.,
1991.
Web.
None.
Heat recovery on a nitric acid plant. A demonstration at Kemira Ince Ltd., Ince, Chester (GB).
United Kingdom.
None.
1991.
"Heat recovery on a nitric acid plant. A demonstration at Kemira Ince Ltd., Ince, Chester (GB)."
United Kingdom.
@misc{etde_10124691,
title = {Heat recovery on a nitric acid plant. A demonstration at Kemira Ince Ltd., Ince, Chester (GB)}
author = {None}
abstractNote = {Kemira Ince Limited are saving Pound 260,000/year in energy costs as a result of modifications to the heat recovery train on one of their older, 450 te/day nitric acid plants at their site at Ince near Chester in the U.K. The installed cost of the project was Pound 620,000 giving a simple payback period of 2.6 years after allowing for maintenance costs. The company produces a range of ammonia-based products, including large quantities of nitric acid. Nitric acid production is a highly exothermic process. Heat is recovered by cooling the process gases which leave the ammonia burner, to around 200{sup o}C. This project increased the amount of heat recovered, first at 180{sup o}C, by additional boiler feedwater pre-heating, then at around 140{sup o}C in a novel design of coil heat exchanger. The exchanger operates in an acid condensing regime, which pre-heats the demineralised water make-up to the deaerator. Other heat recovery measures included using an additional heat exchanger to recover heat from contaminated condensate, and reducing the operating pressure of the tail gas boiler. These measures produced an additional 6 te/h of steam, principally at 3.5 bar, resulting in a fuel saving at the central boiler plant of 17 GJ/h. To avoid a surplus of low pressure steam, the project also included the replacement of a turbine drive, originally exhausting at 3.5 bar, to operate at 13 bar back pressure. Since commissioning in May 1988, the new equipment has all operated satisfactorily and is achieving the anticipated benefit in terms of heat recovery. (author).}
place = {United Kingdom}
year = {1991}
month = {Jan}
}
title = {Heat recovery on a nitric acid plant. A demonstration at Kemira Ince Ltd., Ince, Chester (GB)}
author = {None}
abstractNote = {Kemira Ince Limited are saving Pound 260,000/year in energy costs as a result of modifications to the heat recovery train on one of their older, 450 te/day nitric acid plants at their site at Ince near Chester in the U.K. The installed cost of the project was Pound 620,000 giving a simple payback period of 2.6 years after allowing for maintenance costs. The company produces a range of ammonia-based products, including large quantities of nitric acid. Nitric acid production is a highly exothermic process. Heat is recovered by cooling the process gases which leave the ammonia burner, to around 200{sup o}C. This project increased the amount of heat recovered, first at 180{sup o}C, by additional boiler feedwater pre-heating, then at around 140{sup o}C in a novel design of coil heat exchanger. The exchanger operates in an acid condensing regime, which pre-heats the demineralised water make-up to the deaerator. Other heat recovery measures included using an additional heat exchanger to recover heat from contaminated condensate, and reducing the operating pressure of the tail gas boiler. These measures produced an additional 6 te/h of steam, principally at 3.5 bar, resulting in a fuel saving at the central boiler plant of 17 GJ/h. To avoid a surplus of low pressure steam, the project also included the replacement of a turbine drive, originally exhausting at 3.5 bar, to operate at 13 bar back pressure. Since commissioning in May 1988, the new equipment has all operated satisfactorily and is achieving the anticipated benefit in terms of heat recovery. (author).}
place = {United Kingdom}
year = {1991}
month = {Jan}
}