Method of Increasing the Performance of a Carbonaceous Fuel Combusting Boiler System

a carbonaceous fuel and boiler system technology, applied in the direction of steam engine plants, machines/engines, steam regeneration, etc., can solve the problems of significant increase of lpeco, reduced efficiency, low heat transfer coefficient, etc., and achieve the effect of increasing the power of a carbonaceous fuel combusting boiler, without substantially decreasing the thermal efficiency
US20110094228A1Inactive Publication Date: 2011-04-28FOSTER WHEELER ENERGY CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
FOSTER WHEELER ENERGY CORP
Publication Date
2011-04-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method of increasing the power of a carbonaceous fuel combusting boiler system includes the steps of (a) feeding carbonaceous fuel into a furnace of the boiler system, (b) feeding oxidant gas into the furnace for combusting fuel to produce exhaust gas, (c) discharging the exhaust gas from the furnace via an exhaust gas channel, (d) conveying a stream of feedwater from a boiler economizer arranged in the exhaust gas channel to evaporating and superheating heat exchange surfaces arranged in the furnace and in the exhaust gas channel for converting the feedwater to superheated steam, (e) expanding the superheated steam in a high-pressure steam turbine for generating power, (f) extracting steam from the high-pressure steam turbine at a decreased rate for preheating the feedwater, (g) conveying steam from the high-pressure steam turbine at an increased rate to a reheater arranged in the exhaust gas channel for generating reheated steam, (h) expanding the reheated steam in an intermediate pressure steam turbine for generating power, and (i) conveying the exhaust gas in the exhaust gas channel from the reheater through a boiler economizer to a gas heater. The heat exchange surface area of at least one of the reheater and the boiler economizer is increased and / or a high pressure economizer is added downstream of the boiler economizer and upstream of the gas heater.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a method of increasing the performance, i.e., the thermal efficiency and / or power of a carbonaceous fuel combusting boiler system.

[0003] 2. Description of the Related Art

[0004] In a carbonaceous fuel combusting boiler system, the flue gas discharged from a furnace along a flue gas channel is cooled down in a heat recovery area (HRA), including superheater (SH) and reheater (RH) sections, downstream of which the heat is recovered by a boiler economizer (ECO) to heat up feedwater, followed by a gas heater (GH), such as an air heater, to heat up oxidant gas for the combustion. The superheated steam is expanded in a high-pressure steam turbine (HPST). At least a portion of the expanded steam is reheated in the RH section and conducted to an intermediate-pressure steam turbine (IPST), and further, to a low-pressure steam turbine (LPST). The expanded steam is cycled back to the boiler via a cond...

Claims

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