초록 ▼

A modified air heater gas inlet plenum for a tubular air heater which permits retrofit installation of additional flue gas environmental treatment equipment. A divider plate is located within the inlet plenum to subdivide it into first and second flue gas passages. The first flue gas passage created

A modified air heater gas inlet plenum for a tubular air heater which permits retrofit installation of additional flue gas environmental treatment equipment. A divider plate is located within the inlet plenum to subdivide it into first and second flue gas passages. The first flue gas passage created by the divider plate merely conveys the hot flue gas through the inlet plenum and into flues which convey the flue gas to the new equipment. Return flues convey the flue gas back to the second flue gas passage created in the inlet plenum which, in turn, conveys the flue gas into the tubular air heater heat exchanger tubes. By taking advantage of the large size of a conventional air heater gas inlet plenum, the first and second flue gas passages created by the divider plate still have sufficient cross sectional area so that acceptable flue gas velocities are preserved. One particular application of the modified air heater gas inlet plenum is to permit retrofit application of selective catalytic reduction (SCR) systems for treating flue gas to existing steam generators or boilers.

대표청구항 ▼

1. A method of modifying a gas inlet plenum for a tubular air heater to permit retrofit installation of flue gas treatment equipment, the gas inlet plenum being fluidically connected to a plurality of heat exchanger tubes of the tubular air heater for conveying the hot flue gas therethrough and air

1. A method of modifying a gas inlet plenum for a tubular air heater to permit retrofit installation of flue gas treatment equipment, the gas inlet plenum being fluidically connected to a plurality of heat exchanger tubes of the tubular air heater for conveying the hot flue gas therethrough and air there across in heat exchange relationship, and having a first flue gas inlet, a rear wall, and side walls, comprising the steps of:modifying at least one of the rear wall and the side walls of the gas inlet plenum to provide a flue gas outlet and a second flue gas inlet therein; installing divider plate means into the gas inlet plenum for subdividing the gas inlet plenum into a first and a second flue gas passage; the first flue gas passage for conveying hot flue gas from the first flue gas inlet of the gas inlet plenum through the gas inlet plenum to the flue gas outlet and providing hot flue gas to the flue gas treatment equipment while preventing the hot flue gas from entering the plurality of heat exchanger tubes; the second flue gas passage for receiving hot flue gas from the flue gas treatment equipment and conveying the hot flue gas from the second flue gas inlet of the gas inlet plenum into the plurality of heat exchanger tubes; and wherein the first flue gas passage is located next to the second flue gas passage, the divider plate means extending within the inlet plenum means substantially across a width and depth of the tubular air heater between the first and second flue gas passages.