WO2011026589A2

WO2011026589A2 - Method for producing synthetic gas

Info

Publication number: WO2011026589A2
Application number: PCT/EP2010/005253
Authority: WO
Inventors: Norbert Ullrich
Original assignee: Uhde Gmbh
Priority date: 2009-09-02
Filing date: 2010-08-27
Publication date: 2011-03-10
Also published as: EP2531574A2; WO2011026589A3; DE102009039749A1

Abstract

The invention relates to a method for producing synthetic gas by gasification of an ash-containing fuel with oxygen-containing gas at temperatures above the melting temperature of the ash and with a pressure of 0.3 to 8 MPa, wherein the enthalpy accumulated from producing the synthetic gas is used to produce steam, particularly high-pressure steam. This is achieved in that the medium mixture, which is leaving the gasifier outlet and which is inside the pressure container, flows down in the gravitational direction through a region designed as a heat boiler. The medium mixture downstream of the heat boiler region is supplied with a water quench, and the synthetic gas is cooled to an outlet temperature of 200 °C to 400 °C.

Description

"Process for the production of synthesis gas"

The invention is directed to a process for the production of synthesis gas by gasification of ash-containing fuel with oxygen-containing gas at temperatures above the melting temperature of the ash and a pressure of 0.3 to 8 MPa.

Such gasification processes and corresponding reactors are known in different constructions, for example, reference should be made here to WO 2009/036985 AI of the Applicant as an example. Also in DE 10 2005 048 488 AI a gasification reactor with partial quenching is shown in Fig. 5.

In the gasification of such carbonaceous fuels, for example, coals, coke, petroleum coke, biomass or the like are used, here the entrained flow gasification can be provided with Trockeneinspeisen the carburetor feed for the production of fuels, chemical raw materials, but also for the production of energy.

This is where the invention begins, the object of which is to use the enthalpy produced by the production of the synthesis gas for the production of steam, in particular high-pressure steam.

This object is achieved by a method of the type described above in that the leaving the carburetor leaving the mixture within the pressure vessel designed as a waste heat boiler area flows through in the direction of gravity down, wherein the media mixture is acted upon by the waste heat boiler area of a water quench and the synthesis gas to an outlet temperature is cooled from 200 ° C to 400 ° C.

CONFIRMATION COPY By means of the procedure according to the invention, it is possible to use the heat and enthalpy contained in the media mixture through the waste-heat boiler zone connected downstream of the entrained-flow gasifier in order to generate steam or a steam mixture which can be fed to a further use. By the term "media mixture" is meant in particular the synthesis gas and the other constituents, such as the slag and the like. By the method according to the invention, the hot synthesis gas in the waste heat boiler area of about

1300 ° C to 1600 ° C to 800 ° C to 900 ° C accordingly cooled and then further cooled by a water quench to 200 ° C to 300 ° C.

To solve the problem formulated at the outset, the invention also provides an apparatus for the production of synthesis gas, which is characterized in that behind the carburetor in the pressure vessel in the heat recovery boiler area forming radiation boiler wall from boiler feed water flowed through pipes is provided.

In an embodiment of such a device can also be provided that the boiler radiation wall flowed through boiler feed water, having projecting into the interior of the reactor bulkheads.

By quenching from 1300 ° C to 1600 ° C down to 900 ° C, the molten ash particles are solidified, so that in the downstream heat recovery steam generator without fixed insoluble caking is made possible, since then fixed airborne dust either not at the heat exchanger surfaces adheres or can be easily cleaned by knocker or soot blower.

As stated above, in the waste heat boiler zone, which is formed by a radiation vessel wall and bulkheads projecting into the gas flow (both in pipe-web-pipe design), the bulkheads are only about one-third protrude into the boiler, the synthesis gas cooled after quenching of about 900 ° C to below 400 ° C, with this enthalpy steam, in power plant process preferably high-pressure steam, in a syngas production preferably medium-pressure steam generated. The after-water quenching with the following cooling with steam laden, partially saturated synthesis gas is then supplied from the waste heat boiler further treatment steps.

Alternatively, a device according to the invention is provided, in which a water quench is provided before and / or after the boiler radiation wall in the flow direction of the media, wherein, as stated above, according to the invention, the corresponding wall surfaces and the bulkheads are formed by a pipe-web-pipe construction , In addition, as already stated above, knockers and / or sootblowers can be provided for cleaning off the respective wall surfaces. If the water quench, as the invention also provides, is only positioned behind the waste heat boiler area, the synthesis gas is partially saturated with water vapor, the radiation boiler below the gasifier being dimensioned according to the invention in such a way that the hot synthesis gas is cooled predominantly via radiant heat emission and the radiation boiler also consists of a radiation vessel wall located in the pressure vessel with bulkheads projecting into the gas flow.

Visible, the two variants of the invention both the corresponding method, such as the corresponding device, are used to optimize the gasification of power plant processes, with the most efficient use of raw materials in the production of synthesis gases, such as CO or H ₂ , for the chemical industry and the production synthetic fuels or synthetic natural gas and for plants for the combined generation of electricity and production of chemicals (polygeneration). Further features, details and advantages of the invention will become apparent from the following description and with reference to the drawing, which shows in

Fig. 1 is a gasification reactor with elements of the prior

Technology as well as in

Fig. 2 shows a device according to the invention.

The device, generally designated 1, has a pressure vessel 2 with which a reaction space 4 is provided at a distance from the pressure vessel 2 through a membrane wall 3. 5, the annular steam collector of the membrane wall 5 is referred to, where it does not come closer here.

The reaction space 4 merges into a cone 6 at the bottom, in the outlet region of which a water quench 7 is provided. Side of Fig. 1, this carburetor area is designated by a double arrow "A". After the quench area marked "B", a waste heat boiler zone "C" follows.

The waste heat boiler area C is designed as a radiation boiler 8, which has inwardly facing bulkheads 9, which, like the wall of the radiation boiler 8, are flowed through by boiler feed water 10. The steam or water vapor outlet is denoted by 11.

At the lower end, a slag collecting container 12 is provided within a water bath 13. The synthesis gas outlet is designated 14.

In addition, temperature ranges are indicated in FIGS. 1 and 2; for the reaction space 4, these are at 1300.degree. C. to 1600.degree. behind the cone outlet 6 and the water quench 7 at about 900 ° C, the temperature in the region of the slag collecting container 12 and the water bath 13 is about 300 ° C to 400 ° C. The synthesis gas outlet thus also has a temperature in this range, ie between 300 ° C and 400 ° C.

2, the functionally identical parts are designated by the same reference numerals, wherein the device is generally designated la in order to make the structural difference to the embodiment of FIG. 1 recognizable.

In contrast to the construction according to FIG. 1, here the water quench 7a is arranged below the waste-heat boiler region C, so that here too the water-quenching region is referred to as B '.

Visible here at higher temperatures, the total enthalpy of the medium flowed through the reactor 2 are largely delivered to the waste heat boiler area C or to the corresponding wall 8 and the bulkheads 9, these areas are designed as a pipe-web pipe construction.

Of course, the described embodiments of the invention are still to be modified in many ways, without departing from the spirit, especially as regards the guidance of the flowing in the direction of gravity from top to bottom media within the reactor 2 and the like.

Claims

Claims:

Process for the production of synthesis gas by gasification of ash-containing fuel with oxygen-containing gas at temperatures above the melting temperature of the ash and a pressure of 0.3 to 8 MPa,

characterized ,

that the media mixture leaving the carburetor outlet flows through a region designed as a waste heat boiler in the direction of gravity downwards within the pressure vessel, the water being subjected to a quench of water behind the waste heat boiler zone and the synthesis gas being applied to one

Outlet temperature of 200 ° C to 400 ° C is cooled.

Apparatus for the production of synthesis gas by gasification of ash-containing fuel with oxygen-containing gas at temperatures above the melting temperature of the ash and a pressure of 0.3 to 8 MPa, in particular for carrying out the method according to one of the preceding claims,

characterized,

that behind the carburetor (4) in the pressure vessel (2) is provided a radiation boiler wall (8) forming a waste-heat boiler area (C) through which boiler feed water flows.

Device according to claim 2,

characterized,

that the boiler radiation wall (8) flowed through boiler feed water, in the interior of the reactor projecting bulkheads (9).

Device according to claim 2 or 3,

characterized,

that before and / or after the boiler radiation wall (8) in

Flow direction of the media a water quench (7,7 ') is provided. Device according to claim 2 or one of the following, characterized

in that the radiation boiler wall (8) and the bulkheads (9) are formed from a pipe-web-pipe construction through which the boiler feed water flows.

Device according to claim 2 or one of the following, characterized

that knockers and / or sootblowers are provided in the waste heat boiler area (C) for cleaning the radiation boiler wall (8).