Showing papers on "Integrated gasification combined cycle published in 1991"

Integrated air separation plant-integrated gasification combined cycle power generator

Abstract: An integrated cryogenic air separation unit power cycle system is disclosed wherein the air separation unit (ASU) is operated at elevated pressure to produce moderate pressure nitrogen. The integrated cycle combines a gasification section wherein a carbon source, e.g., coal is converted to fuel and combusted in a combustion zone. The combustion gases are supplemental with nitrogen from the air separation unit and expanded in a turbine. Air to the cryogenic air separation unit is supplied via a compressor independent of the compressor used to supply air to the combustion zone used for combusting the fuel gas generated in the gasifier system.

Integrated processes for the production of carbon monoxide

Abstract: The present invention is an integrated process for the adsorptive recovery of a high purity carbon monoxide product from a gas mixture containing hydrogen, carbon monoxide, carbon dioxide, methane, and nitrogen, with the potential additional recovery of a hydrogen-rich stream and the recycle of the resulting gas mixture to a reformation reaction to produce the gas mixture with a more favorable carbon monoxide and hydrogen product slate Separate carbon dioxide recovery can be performed Hydrogen recovery can be either by adsorptive or by membrane technology The process achieves high recoveries at reduced capital cost and at reduced product cost

Analysis of a fixed-bed gasifier IGCC configuration

Abstract: Integrated coal gasification combined cycle (IGCC) systems offer substantial advantages for power generation. This paper analyzes a proposed configuration in which regeneration gases from a zinc ferrite based, fixed-bed, hot-gas desulfurization system are recycled to a fixed-bed gasifier for capture and disposal of the sulfur by a calcium-containing material (e.g., limestone) added to the coal. This study concluded that the proposed system is less attractive than originally thought, primarily due to the low sulfur capture efficiency of a fixed-bed gasifier, the uncertain composition of the bottom ash, and the regeneration characteristics of zinc ferrite in a fixed-bed reactor

Process for purifying high-temperature reducing gases and composite power plant with coal gasification

Abstract: Disclosed is a process for purifying a high temperature reducing gas by removing sulfur compounds contained in the reducing gases by dry adsorption on an adsorbent The process comprises subjecting the high temperature reducing gas to a catalytic CO-shift reaction in a reactor having a catalyst and equipped with a heat recovery means for controlling the reaction gas temperature while injecting steam into the high temperature reducing gas, in order to convert the content of CO in the high temperature reducing gas into CO2, effecting the removal of the sulfur compounds and CO2 by dry adsorption on adsorbent under control of the temperature of the gas by means of the heat recovery means of the reactor and separating the sulfur compounds from CO2 The sulfur compounds separated from CO2 may be supplied to a Claus process sulfur recovery unit to convert H2S in the sulfur compounds into elementary sulfur to recover it Also disclosed is an integrated coal gasification combined cycle (IGCC) power plant, which comprises a CO-shift reactor for converting CO in a purified product gas into CO2 disposed between a gas purifier and a combustor of a gas turbine power generation unit, a means for removing CO2 and sulfur compounds from the coal gas in dry system and a sulfur compound separator for separating sulfur compounds from the gas left after the removal of CO2 and sulfur compounds

Thermoeconomic design optimization of a KRW-based IGCC power plant

Abstract: This report discussed the cost and efficiency optimization of an integrated gasification-combined-cycle (IGCC) power plant design and the effects of important design options and parameters. Advanced thermoeconomic techniques were used to evaluate and optimize a given IGCC concept which uses Illinois No. 6 bituminous coal, air-blown KRW coal gasifiers, a hot gas cleanup system, and GE MS7001F gas turbines. Three optimal design concepts are presented and discussed in the report. Two of the concepts are characterized by minimum cost of electricity at two different values of the steam high pressure. The third concept represents the thermodynamic optimum. This study identified several differences between the original design and the design of the optimized cases. Compared with the original concept, significant annual savings are achieved in the cost optimal cases. Comparisons were made between results obtained using both the old and the new performance data for the MS7001F gas turbine. This report discusses the effects of gasification temperature, steam high pressure, coal moisture, and various design options on the overall plant efficiency and cost of electricity. Cost sensitivity studies were conducted and recommendations for future studies were made.

Process for fixed bed coal gasification

Abstract: The combustion of gas produced from the combination of coal pyrolysis and gasification involves combining a combustible gas coal and an oxidant in a pyrolysis chamber and heating the components to a temperature of at least 1600° F. The products of coal pyrolysis are dispersed from the pyrolyzer directly into the high temperature gasification region of a pressure vessel. Steam and air needed for gasification are introduced in the pressure vessel and the materials exiting the pyrolyzer flow down through the pressure vessel by gravity with sufficient residence time to allow any carbon to form carbon monoxide. Gas produced from these reactions are then released from the pressure vessel and ash is disposed of.

Device for collecting liquid carbon dioxide

Abstract: PURPOSE: To obtain a low power consumption type device by compressing and cooling a carbon dioxide concentrated gas adsorbed by a PSA carbon dioxide concentrator which concentrates carbon dioxide in dehumidified gas and liquefying roughly the gas by way of a Joule-Thomson valve and then producing a highly concentrated liquid in a refining tower. CONSTITUTION: The combustion gas of an LNG combustion boiler of a power plant is introduced into a PSA dehumidification device 2 filled with a moisture adsorption material. After the moisture is eliminated, the combustion gas is introduced into a PSA carbon dioxide concentrator 3 in which carbon dioxide adsorption material is filled so as to adsorb about 90% of carbon dioxide selectively. The dry gas containing residual carbon dioxide is introduced into a PSA dehumidification device in a reproduction process so as to regenerate the moisture adsorption material. The carbon dioxide adsorbed in the concentrator 3 is pressure-reduced and collected by means of a vacuum pump 5. After it is once stored in a surge tank 6, the carbon dioxide is boosted by a compressor 8 and roughly liquefied by way of a heat exchanger 9, a Joule-Thomson valve 10 and then it is collected as a highly concentrated liquefied carbon dioxide at a refining tower 11 whereas a non-concentrated gas is circulated to the concentrator 3. COPYRIGHT: (C)1992,JPO&Japio

Thermoeconomic design optimization of a KRW-based IGCC power plant. Final report

Abstract: This report discussed the cost and efficiency optimization of an integrated gasification-combined-cycle (IGCC) power plant design and the effects of important design options and parameters. Advanced thermoeconomic techniques were used to evaluate and optimize a given IGCC concept which uses Illinois No. 6 bituminous coal, air-blown KRW coal gasifiers, a hot gas cleanup system, and GE MS7001F gas turbines. Three optimal design concepts are presented and discussed in the report. Two of the concepts are characterized by minimum cost of electricity at two different values of the steam high pressure. The third concept represents the thermodynamic optimum. This study identified several differences between the original design and the design of the optimized cases. Compared with the original concept, significant annual savings are achieved in the cost optimal cases. Comparisons were made between results obtained using both the old and the new performance data for the MS7001F gas turbine. This report discusses the effects of gasification temperature, steam high pressure, coal moisture, and various design options on the overall plant efficiency and cost of electricity. Cost sensitivity studies were conducted and recommendations for future studies were made.

New Ecologically Acceptable Methods for Fuel and Power Production from Biomass and Peat

Abstract: The demand for clean fuels and electrical power is increasing in Finland and is expected to continue to do so in the near future. This calls for new methods for converting presently used fuels to ecologically more beneficial ones, or developing better processes for their utilization. Upgrading the quality of the fuel gas obtained by gasification of solid fuels, thermal treatment of pulp mill black liquor to fuel oil, and integrated gasification combined cycle power production are current research topics at the Technical Research Centre of Finland (VTT). This article describes some results of the work on biomass and peat utilization at VTT. Fuel gas produced from peat and wood chips is used at about 10 district heating boiler plants in Scandinavia. The gas has to be burned close to the gasifier because of its tar content. In order to make pipeline transport, engine use, and some industrial applications possible, further processing of the gas is necessary. Both catalytic and thermal cracking of the...

Process and apparatus for fixed bed coal gasification

Abstract: An apparatus for fixed-bed coal gasification is described in which coal such as caking coal is continuously pyrolyzed in a pyrolyzer (12) with clump formation inhibited, by combining the coal with a combustible gas and an oxidant (16), and then continually feeding the pyrolyzed coal under pressure and elevated temperature into gasification region of a pressure vessel (14). Steam and air (20) needed for gasification are introduced in the pressure vessel and the materials exiting the pyrolyzer (12) flow down through the pressure vessel (14) by gravity with sufficient residence time to allow any carbon to form carbon monoxide. Gas produced from these reactions are then released from the pressure vessel (14) and ash (24) is disposed of.

Integrated production of methanol and electric power

Abstract: A method is disclosed for the production of methanol and fuel gas from CO-rich synthesis gas and water in a liquid phase reactor containing a solid catalyst suspended in a paraffinic liquid. The addition of water in appropriate amounts increases the reactor methanol productivity compared with that obtained without the addition of water. The method can be integrated with an Integrated Gasification Combined Cycle (IGCC) power generation process to coproduce methanol and electric power.

加圧二段噴流床石炭ガス化炉の開発 : 第1報, 基本ガス化特性 ( 新エネルギー技術開発のための研究)

Abstract: Experimental study using a 2T/D air-blown pressurized two-stage entrained flow coal gasifier was initiated in 1983. Various tests and research efforts with the gasifier have been conducted to investigate the characteristics of coal gasification, slag discharge, etc. Sixteen bituminous coals have been tested and the total gasification time (as of August 1989) has reached 1500 hours. This report presents the experimental test results on the coal gasification characteristics for 5 typical coals. As a result of the gasification tests, it should be noted that steady discharge of molten slag was accomplished under air-blown conditions also for high-ash-melting coals. The HHV of the product gas, cold gas efficiency, and carbon conversion efficiency were highly dependent on the air ratio and the carbon recycle rate. The per pass carbon conversion efficiency and the amount of product char were affected by the gasifier air ratio and the coal types.

Development of standardized air-blown coal gasifier/gas turbine concepts for future electric power systems

Abstract: The objective of this study is to develop standardized air blown fixed bed gasification hot gas cleanup integrated gasifier combined cycle (IGCC) systems.

Analysis of Integrated Coal Gasification System/Compressed-Air Energy Storage Power Plant Concepts

Abstract: This paper presents the results of a project targeted at developing cost effective power plant concept with integrated Coal Gasification System (CGS) and with Compressed Air Energy Storage (CAES) plant. The developed concepts, denoted as CGS/CAES, provide for continuous operation of CGS and the reheat turboexpander train which are high temperature components, thus improving their operation and extending life resource. A parametric thermodynamic analysis is performed for several CGS/CAES concepts differentiated by their turbomachinery parameters, CGS arrangements, operating cycles, and hours of daily generation. A qualitative cost estimate is made using a variety of sources including published EPRI reports and extensive in-house cost data. A technical and cost comparison is made to the Integrated Gasification Combined Cycle (IGCC) plant.Copyright © 1991 by ASME

Development of standardized air-blown coal gasifier/gas turbine concepts for future electric power systems. Volume 1, Final report

Abstract: The objective of this study is to develop standardized air blown fixed bed gasification hot gas cleanup integrated gasifier combined cycle (IGCC) systems.

Enhancement of IGCC through clean by-product fuel coproduction

Abstract: The major objective of this paper is to first design a base case IGCC plant that is representative of a base-loaded power plant, and then to identify and to quantify the potential benefits of a spare gasifier and fuel-grade methanol coproduction as additions to the base case plant. This is significantly different than previous methanol coproduction IGCC studies which have assumed cyclic operation with undersized coal gasification capacity. The proposed IGCC plant will be at FPL's Martin Site, located near the eastern shore of Lake Okeechobee, Florida. The major components of the proposed IGCC plant are: dry-feed (Shell) or slurry-feed (Dow) gasifiers, GE advanced gas turbine (Model MS7001F), methanol plant based on liquid Phase Methanol (LPMeOH*) process.

Outline and Current Status of PFBC Combined Cycle Power Generation.

Abstract: The pressurized fluidized bed combustion is designed to burn a mixture of coal and limestone under pressure in a fluidized condition and to perform in-situ desulfurization at the same time the coal is being burned. This coal burning technology features an improvement of the combustion efficiency by pressure and compactness, in addition to the corresponding property for various kinds of coal possessed by the atmospheric fluidzed bed combustion, and environmental acceptance.Since this combustion is carried out under pressure, combustion gas is sent to the gas turbine and electricity is generated by the surplus energy at the same time the pressure of the combustion air is raised by the compressor. Higher thermal efficiency is expected be-cause a combined cycle power generation system can be composed together with the power generation using a steam turbine.Recently, the problem of global warming is being discussed and its countermeasure has become an urgent issue. Effort should be made to put the PFBC combined cycle power gen-eration system into practical use as quickly as possible as an effective means to reduce CO2 emissions.