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

Inactive Publication Date: 2010-06-17
SIEMENS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0004]The object to be achieved by the subject matter of the application is to further develop a method and an arrangement of a particulate feed system for the press

Problems solved by technology

Although the particulate feed systems based on dense-phase pneumatic conveying operate with very high loading ratios, the nitrogen introduced into the

Method used

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

Examples

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Embodiment Construction

[0010]Heated nitrogen N2 can be fed as an inerting and disaggregating medium to a bin BK for storing solid matter FS such as pulverized coal, which bin is at ambient pressure and can be heated. The solid matter can be fed via a conveying device to a feed lock hopper SES which is at a high operating pressure of e.g. 40 bar. Carbon dioxide CO2 can be supplied to the feed lock hopper as an inerting and conveying medium at a temperature above the threshold to the two-phase region at high operating pressure. In the upper region of the feed lock hopper the depressurization gas is drawn off, expanded to ambient pressure via a multi-stage depressurization device mEV and de-dusted in a downstream filter F at ambient pressure. The solid matter is transferred by gravity flow from the feed lock hoppers to the metering vessel DG via an adequately dimensioned downcomer. Two to four lock hoppers are used for each particulate feed system.

[0011]Carbon dioxide is used as a fluidizing gas. A partial f...

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Abstract

A particulate feed arrangement used in pulverized coal gasification under pressure is provided. The arrangement includes a reservoir for stocking the pulverized coal, a plurality of powder injection tubes, and a metering unit. Pure carbon dioxide is fed to the components that are at operating pressure, namely the power injection tube and the metering unit, as the inerting and flow medium or fluidizing medium. The carbon dioxide-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 elimination of any nitrogen 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 / 054706, filed Apr. 18, 2008 and claims the benefit thereof. The International Application claims the benefits of German application No. 10 2007 020 333.2 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 and an arrangement for operating a particulate feed system for the pressurized gasification of pulverized coal, having the features set forth in the claims.BACKGROUND OF INVENTION[0003]Nitrogen from the air separation unit is normally used as the inerting and conveying medium in pneumatically operated particulate feed systems for high-pressure gasification plants using pulverized coal. This process variant has proved its worth both in particulate feed systems for injecting pulverized coal into blast furnaces and also for...

Claims

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Application Information

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IPC IPC(8): B65B31/00
CPCC10J3/00C10J3/50C10J3/78C10J2300/0969C10J2200/156C10J2300/093C10J2200/15Y02P20/141
Inventor SCHINGNITZ, MANFREDTIETZE, GUNTER
Owner SIEMENS AG
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