Arrangement for and a method of operating a steam boiler system
AssigneeSumitomo SHI FW Energia Oy
InventorAntti Rokka
Life of this patent
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Abstract
A method of operating and an arrangement for a steam boiler system including a furnace and along a following flue gas channel a number of superheaters, a number of economizers, and at least one air preheater located in the flue gas channel downstream of the economizers, a fabric filter baghouse located in the flue gas channel downstream of the air preheater, and downstream of the fabric filter baghouse is located a selective catalytic reduction (SCR) system including an SCR reactor, a high pressure steam coil heater upstream of the SCR reactor and a gas-gas heat exchanger connected upstream and downstream of the SCR reactor to transfer heat from flue gas after the SCR reactor to the flue gas upstream of the high pressure steam coil heater.
Claims15
An arrangement for a steam boiler system, the arrangement comprising:
- a furnace;
- a number of superheaters along a flue gas channel that follows the furnace;
- a plurality of economizers;
- at least one air preheater located in the flue gas channel downstream of the economizers;
- a fabric filter baghouse located in the flue gas channel downstream of the at least one air preheater;
- a selective catalytic reduction (SCR) system downstream of the fabric filter baghouse, the SCR system comprising an SCR reactor, a steam coil heater upstream of the SCR reactor and a gas-gas heat exchanger connected upstream and downstream of the SCR reactor to transfer heat from flue gas after the SCR reactor to the flue gas upstream of the steam coil heater;
- and
- at least one heat exchanger located in the flue gas channel after the SCR system, the heat exchanger being configured to transfer heat, when in use, from the flue gas downstream of the SCR system to a fluid medium in a fluid circuit, the fluid circuit comprising at least one pump configured to lead the fluid medium to preliminary air heaters configured to heat inlet air before entering the flue gas air preheater.
A method of operating a steam boiler system, the method comprising:
- providing a furnace;
- providing a plurality of superheaters;
- providing a flue gas channel following the plurality of superheaters;
- providing a plurality of economizers and at least one air preheater located in the flue gas channel downstream of the economizers;
- providing a fabric filter baghouse in the flue gas channel downstream of the air preheater;
- locating a selective catalytic reduction (SCR) system downstream of the filter baghouse, the SCR system comprising an SCR reactor, a steam coil heater upstream of the SCR reactor;
- connecting a gas-gas heat exchanger upstream and downstream of the SCR reactor to transfer heat from flue gas after the SCR reactor to the flue gas upstream of the steam coil heater;
- locating at least one heat exchanger in the flue gas channel after the SCR system, the heat exchanger transferring heat, when in use, from the flue gas downstream of the SCR system to a fluid medium in a fluid circuit;
- leading the fluid medium to preliminary air heaters by the fluid circuit;
- and
- heating inlet air before entering to the flue gas air preheater.
Dependencies are inferred from the claim text.