Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1990-07-13
1992-12-15
Langel, Wayne
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
110345, 423235, 4232405, 42324407, C01B 1748, C01B 2120
Patent
active
051715520
ABSTRACT:
The invention provides a furnace desulfurization process which includes supplying a desulfurizing agent into a furnace or flue to cause the agent to absorb SO.sub.2 from the exhaust gas, the desulfurizing agent being a salt obtained by at least partly neutralizing a Ca desulfurizing agent with an acid; a furnace desulfurization process which includes supplying a Ca desulfurizing agent into a furnace or flue to effect a first-stage desulfurization reaction, collecting ash containing a waste of the agent having an unreacted substance enclosed therein from the exhaust gas, adding an acid to the collected ash to at least partly neutralize the unreacted portion of the agent, and recycling the ash containing the resulting salt into the furnace or flue to effect a second-stage desulfurization reaction; a dry simultaneous desulfurization-denitration process which includes supplying a Ca desulfurizing agent into a furnace or flue to effect a desulfurization reaction, collecting ash containing a waste of the agent having an unreacted substance enclosed therein from the exhaust gas, adding a denitrating reducing agent to the collected ash, and recycling the ash containing the waste desulfurizing agent and the reducing agent into the furnace or flue to effect desulfurization and denitration reactions; and a dry simultaneous desulfurization-denitration process which includes supplying a Ca desulfurizing agent into a furnace or flue to effect a desulfurization reaction, collecting ash containing a waste of the agent having an unreacted substance enclosed therein from the exhaust gas, adding an acid to the collected ash to at least partly neutralize the unreacted substance, adding a denitrating reducing agent to the ash containing the resulting salt, and recycling the ash containing the salt and the reducing agent into the furnace or flue to effect desulfurization and denitration reactions.
REFERENCES:
patent: 4533532 (1985-08-01), Gebhard et al.
patent: 4731233 (1988-03-01), Thompson et al.
patent: 4980138 (1990-12-01), Samish
Doi Teruyuki
Hama Toshio
Ishida Michio
Ito Michio
Kawanabe Teruhiko
Hitachi Zosen Corporation
Langel Wayne
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