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Mixed biomass treatment with reheat cycle

A reheating and recycling technology, applied in biofuels, co-combustion mitigation, sustainable manufacturing/processing, etc., can solve problems such as low-efficiency steam cycle, reduced boiler combustion efficiency, and low efficiency

Inactive Publication Date: 2017-04-12
EIF NTE HYBRID INTPROP HLDG CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This low level of efficiency in power generation using biomass fuel sources is due to two major disadvantages
First, the moisture content of biomass fuel is usually higher than 40%, which reduces the combustion efficiency of the boiler
Second, the size of biomass fuel fired power plants is typically less than 50MW, which results in a less efficient steam cycle than larger natural gas or fossil fuel fired power plants

Method used

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  • Mixed biomass treatment with reheat cycle
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Embodiment Construction

[0012] The systems and methods of the present invention allow for more efficient energy production from biomass fuels. The improved efficiency of the method is achieved by combining a typical biomass fuel cycle with a natural gas or fossil fuel cycle in a hybrid process. Steam generated from a biomass fuel cycle is combined with steam generated from a natural gas or other fossil fuel cycle, and the combined steam flow is then passed through a steam turbine generator. The proposed process burns biomass fuel separately from natural gas. The combusted gases are kept separate for post-combustion treatment before being released to the atmosphere.

[0013] in e.g. figure 1 and figure 2 In the preferred embodiment shown, the biomass fired boiler operates in parallel with a combined cycle heat recovery boiler (HRSG). This has several effects. First, the working steam pressure of the biomass boiler is no longer limited by the size of the steam turbine generator. Second, the stea...

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Abstract

A method and system for generating electrical power by combining steam streams generated from different fuel sources. Steam generated from processing biomass fuel sources is combined with steam generated from processing natural gas or fossil fuels and sent through a steam turbine generator to generate electrical energy. Preferably the steam is reheated after partial processing in the steam turbine generator and then recycled for further processing in the steam turbine generator. After all available energy has been extracted from the steam, the steam is condensed into water, and the feedwater is then reheated and pumped to a two-energy boiler for conversion to steam.

Description

technical field [0001] The present invention generally relates to methods and systems for generating electricity by combining a biomass combustion system with a conventional energy system, such as a natural gas or other fossil fuel combustion system. More specifically, the present invention is directed to methods and systems for generating electricity by combining the steam output from a biomass fuel cycle with the steam output of a natural gas combined cycle or other fossil fuel fired power plant. Background technique [0002] The use of biomass as a means of generating electricity is well established in the pulp and paper industry. Biomass is also used in stand-alone power generation facilities. One of the drawbacks of steam-based power generation technologies using biomass as fuel is the inherent inefficiency of the power generation cycle relative to the efficiency of natural gas or other fossil fuel fired power plants. This low level of efficiency in power generation u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K7/18
CPCF01D15/10F02C6/18F01K7/22F01K7/40F01K23/10Y02E20/12Y02E20/14Y02E20/16Y02E50/10Y02P80/20H02K7/18F03G7/00
Inventor S.肖尔特利奇G.J.卡希尔
Owner EIF NTE HYBRID INTPROP HLDG CO LLC