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Use of a mixture of carbon dioxide and nitrogen as an inerting and flow medium in powder injection systems for pulverized coal gasification under pressure

Inactive Publication Date: 2010-05-27
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0007]In a particular embodiment of the invention the nitrogen N2/carbon dioxide CO2 mixture ratio is dimensioned according to the highest allowable proportion of nitrogen at the flow control unit to the reactor as a measure of the highest allowable injection of nitro

Problems solved by technology

The problem underlying the subject matter of the application is that of developing a method or an arrangement of a powder injection system for pulverized coal gasification under pressure such that the nitrogen injection into the subsequent gasification system and the disadvantages associated therewith will be restricted.

Method used

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  • Use of a mixture of carbon dioxide and nitrogen as an inerting and flow medium in powder injection systems for pulverized coal gasification under pressure
  • Use of a mixture of carbon dioxide and nitrogen as an inerting and flow medium in powder injection systems for pulverized coal gasification under pressure

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Embodiment Construction

[0011]A reservoir BK under ambient pressure and able to be heated up for supply of solid material FS, such as pulverized coal for example, is able to be supplied with heated nitrogen N2 as an inerting and dispersal medium. The solid material is able to be fed via a flow device to one or more powder injection transfer tubes SES which are at a high operating pressure of for example 40 bar. The powder injection transfer tube is able to be fed a nitrogen N2 / carbon dioxide CO2 mixture as an inerting and flow medium with a temperature above the boundary to the two-phase region at high operating pressure. In the upper area of the powder injection transfer tube the expansion gas is drained away, expanded via a multi-stage pressure relief facility mEV to ambient pressure and dedusted in a following filter F at ambient pressure. The solid material is transferred from the powder injection transfer tubes into the metering vessel DG by gravity flow via a suitably dimensioned downpipe. Between tw...

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Abstract

A powder injection system for use in pulverized coal gasification under pressure is provided. The powder injection system includes a reservoir for stocking the pulverized coal, a plurality of power injection tubes and a metering unit. A mixture of nitrogen and carbon dioxide is fed to the components that are at operating pressure, namely the powder injection tube and the metering unit, as the inerting and flow medium or fluidizing medium. The nitrogen and carbon dioxide mixture-carrying components are heated in such a manner that the temperature is above the threshold of the diphase range. A method is also provided. The method allows reduction of the nitrogen content in the product gas, which nitrogen is caused by the powder injection system, especially when used in pulverized coal gasification under pressure to produce a synthesis gas for the production of different hydrocarbons.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2008 / 054713, filed Apr. 18, 2008 and claims the benefit thereof. The International Application claims the benefits of German application No. 10 2007 020 332.4 DE filed Apr. 30, 2007, both of the applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The subject matter of the application relates to a method for operating a powder injection system for pulverized coal gasification under pressure and to an arrangement for powder injection for pulverized coal gasification under pressure with the features of the claims.BACKGROUND OF INVENTION[0003]Nitrogen from the air separation unit is usually used as an inerting and flow medium in pneumatically-operated powder injection systems of installations for pulverized coal gasification under pressure. This method variant has proven itself both in injection systems for powder injection...

Claims

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Application Information

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IPC IPC(8): C10J3/00
CPCC10J3/00C10J3/50C10J3/78C10J2300/0969C10J2200/156C10J2300/093C10J2200/15Y02P20/141
Inventor SCHINGNITZ, MANFREDTIETZE, GUNTER
Owner SIEMENS AG
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