DE1496375A1 - Method and device for feeding finely divided solid fuels to a dust gasification device operating under increased pressure - Google Patents

Description

_ .._ "__" ,. U96375

• ..- τ · · ' ■ "■ '*"<?' Essen, December 15, 1964,. ' i. , · -. · Jß 4020 / 8h _s Dr.Ha./K.

Heinrich Koppers limited liability company, Essen, Moltkestrasse 29 - "

Method and device for feeding finely divided, solid fuels to "a dust gasifier working under increased pressure

Addition to the patent.

(Patent application K 53 579 VIb / 24e)

The present invention relates to a method and an apparatus for feeding finely divided, solid fuels to a dust gasification unit working under increased pressure

tion. ■ "

In the main patent (patent application K 53 579 IVb / 24e) are already such a method and apparatus described, wherein the Fuel particles suspended in paraffinic hydrocarbons C. - Cc the resulting suspension to the operating pressure brought to the gasifier, passed through a heating zone and is heated so that the hydrocarbons evaporate and then completely separated from the fuel dust and the vapors are condensed, cooled and made after Relaxation can be returned to the input stage of the process, while the fuel dust is returned to the dust gasification device is directed.

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In the process of the main patent, the liquid hydrocarbons are numb to the fuel in such a large amount ^! mixed so that the resulting suspension has the character of a liquid, which can be brought to any high pressure by means of a pump. The quantities of hydrocarbons required in this procedure are, however, so great that they cannot simply be introduced into the gasifier together with the fuel dust or allowed to escape uncondensed as steam. Therefore, extensive hatreds for the recovery and reintroduction of these hydrocarbons are also envisaged in the main patent.

According to the invention it has now been found that these measures for Recovery and reintroduction of the hydrocarbons either can be dispensed with entirely or if recycling of the hydrocarbon for economic reasons in exceptional cases seems indispensable that very small dimensions of the condensation and cooling devices can be used, if the powdery fuel only comes with such a large amount of liquid is made into a paste that a kneadable pulp is created, which is just still by means of a pump, such as the the peat technology for transporting the tough peat slurry known piston pumps, can be promoted. The necessary Liquid amount is between 5 and 20 # based on that Total weight of the resulting pulp. The resulting

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The molding is first fed into a drying zone in which the hydrocarbons evaporate and the molding is crushed. As a result of the low adhesive forces »that between the powder particles prevail, this crushing is possible without difficulty. The small amounts of hydrocarbons released Vapors are then drained or re-condensed or are introduced into the gasifier together with the fuel dust. .

The method of operation according to the invention is to be compared with that shown in Figure be carried out as a horizontal section device shown schematically. The operation of this device is the following:

The means of a device not shown, * z. B. Continuous casting machine, produced molding 5 from fuel dust and Liquid hydrocarbon is taken from the piston 1 lh horizontally The stored introduction space 2 is pushed up to just before the piston 3. The piston 3 now moves the molding 5 to the side until the end face of the piston 3 encounters the tubing closes tightly and the molding-itself in your cavity of the Pipeline 4 is located close to the piston 6. The automatic the piston 1 and 3 is controlled so that when the piston 3 moves to the side in the direction of the tubing to himself the piston 1 at the same time to demand new goods

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H96375

moved backwards. The piston 6 then pushes the molding 5 forward into the so-called sealing zone, the slide 7 opening at the same time, so that the already formed moldings 8, 9, 10, 11 and 12 are also pushed forward towards the drying zone. The fuel dust strand formed from these 'formations, together with the slide 7, simultaneously seals the drying zone, which is under the operating pressure of the gasification device, from the inlet zone, which is under normal pressure. Here, the molding 13, which has meanwhile dried, is broken by the mandrel of the grinding screw 14 and ground to coal dust as it passes through the latter. At the same time there is an evaporation of the added hydrocarbon, since in this area the pipe strand 4 with a heating jacket 17, the z. B. can be filled with hot water or superheated steam, is provided.

The method of operation according to the invention should finally be carried out by the the following numerical example will be further illustrated.

example

In the case of a synthesis gas plant with a daily output of

100,000 Nm ^{3 of} synthesis gas need 2,270 kg of coal dust per hour

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smuggled into the carburettor working at 14 atmospheric pressure will. Η-Butane should be used as admixture liquid to the coal dust. The coal dust used has a specific weight of 1.3 kg / ltr and that liquid η-butane of 0.5992 kg / ltr. With a tree fulfillment capacity of the coal dust of 80% - £ calculated the liter weight of the pulverized coal-butane pulp becomes 1.16 kg.

To preheat this pulp to the evaporation temperature of the η-butane at 14 atmospheres of approx. 90 ° C, an amount of heat of around 40 kcal must be applied, which is to be transferred from the condensed water vapor to the pulp. The outside diameter of the pipe string 4 is 100 mm and the inside diameter is 80 mm. At ₁ a heat transfer capacity of 667 kcal / m "h and a heated tubing length of 7 m can thus JE pipe string are transmitted 4669 kcal / h. The hourly throughput of the pipe string is therefore:

r ^ 117 ltr coal dust butane pulp

or 121.5 kg of coal dust

The number of pipe strings for the entire system is then calculated as "-

2270 _ "o."

With a gasifier of the order of magnitude given above 19 pipe strings have to be used to feed the coal

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dust can be provided. However, it must be taken into account that this calculation takes into account the most unfavorable Heat transfer performance has been made. If the heat transfer values are more favorable, the number of heat exchangers required is reduced Pipe strings up to 10..

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Claims (2)

Essen, December 15th, 1964 H 4020 / 8h. Claims - / I .J method for feeding fuel dust into a dust gasification unit working under increased pressure according to patent ......... (patent application K 55 579 VIb / 24e), characterized in that the fuel dust with a between 5 and 20 $ , based on the total weight of the resulting pulp, the lying amount of paraffin hydrocarbons C ₁ - Cc is made into a kneadable pulp "and this pulp through suitable conveying media, such as piston pumps, into a heating zone under operating pressure of the dust gasification device and from there after evaporation of the added Hydrocarbon and comminution of the formed bodies, optionally together with the hydrocarbon vapors formed, is conveyed into the dust gasification device. 2. Device for performing the method according to. Claim 1> characterized in that the inlet space (2) opening horizontally into the pipe string (4) with a through the piston (1) actuated feeding device for the already preformed Fuel dust molding as well as the down 909820/0562 ^ 1486375 moving and "with its face opposite the tubular carrier" ag (4) tightly abechlieflenden piston (3) is rereehen and that the Pipe strand (4) at β one end through the oak bar moving piston (6) and at β another end by the Sohneoke (14) conveying into the fuel tank (15) lit and also a slide (7), which can be pushed in lolbene (6) auto “atieoh opens, as well as a heating jacket (17) on one of the volumes (15) lying on a fuel container (15).