SO.sub.x, NO.sub.x and particulate removal system
First Claim
1. A method of controlling emissions of a fossil fuel fired boiler which produces flue gases containing SOX, NOX and particulate, the flue gases being supplied along a flue gas stream to a stack for discharge, comprising the steps of:
- providing a high-temperature pulse jet fabric filter house and heat recovering means between the boiler and the stack in series along the flue gas scream with the fabric filter house being upstream of the heat recovering means and having a plurality of fabric filter bags contained therein with each of the fabric filter bags having a bag retainer situated therein;
positioning a selective catalytic reduction catalyst inside each bag retainer of each of the fabric filter bags in the filter house;
injecting sorbent and an ammoniacal compound into the flue gas stream upstream of the fabric filter house for reacting with SOX and NOx, the NOX being further reduced inside the fabric filter house in the presence of the catalyst to clean the hot flue gas; and
supplying the clean hot flue gas to the heat recovering means for recovery of the heat therefrom.
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Accused Products
Abstract
A method for controlling emissions of a fossil fuel fired boiler including a high temperature fabric filter house with an SCR catalyst situated therein for receiving flue gases along with an injected ammoniacal compound and sorbent. The sorbent reacts with the SOx while the ammoniacal compound reduces the NOx in the presence of the SCR catalyst inside the high temperature fabric filter house. Both the SOx and the particulates are removed upstream of the SCR catalyst to diminish the problems of SO2 or SO3 poisoning of the catalyst and erosion and fouling of the catalyst with the fly ash. Since the sulfur oxides and particulates are removed prior to the heat recovery system, the fouling and corrosion potential are substantially decreased thus allowing the heat recovery system to be operated at a lower outlet flue gas temperature which yields an incremental improvement in energy recovery.
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Citations
10 Claims
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1. A method of controlling emissions of a fossil fuel fired boiler which produces flue gases containing SOX, NOX and particulate, the flue gases being supplied along a flue gas stream to a stack for discharge, comprising the steps of:
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providing a high-temperature pulse jet fabric filter house and heat recovering means between the boiler and the stack in series along the flue gas scream with the fabric filter house being upstream of the heat recovering means and having a plurality of fabric filter bags contained therein with each of the fabric filter bags having a bag retainer situated therein; positioning a selective catalytic reduction catalyst inside each bag retainer of each of the fabric filter bags in the filter house; injecting sorbent and an ammoniacal compound into the flue gas stream upstream of the fabric filter house for reacting with SOX and NOx, the NOX being further reduced inside the fabric filter house in the presence of the catalyst to clean the hot flue gas; and supplying the clean hot flue gas to the heat recovering means for recovery of the heat therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification