US1661211A - Method for the dry cooling of coke - Google Patents

Description

March 6, 1928.

R. WUSSOW METHOD FOR THE DRY COOLING 0F COKE Filed 001',- 19. 1926 jnuenfljr I R Wussow Patented Mar. 6, 1928,

UNITED ,STATES, OFFICE;

REINBABD 'WUSSOW, 0,1 CHABLOTTENBURG,;NEARTBERLIN, GERMANY.

METHOD FOR THE DRY COOLING OF COKE.

I Application filed October 19, 1926, Serial 120. 142,693, andin .Qermany January 17, 1933,

The present invention relates to a method of dry cooling of coke and its application to a continuously operating: gas producer. The method consists in passlng a neutral 6 gas or steam or a mixture of both in continuous circulation through a bed of coketo be cooled and through a saturator devlce with a finely divided spray of water, the gas or steam or gas and steam mixture heated to in the layer of coke to be cooled vaporizing a part of the water and carrying? this freshly formed steam with it through the layer of.

coke, such excess steam with suitably high temperatures of the coke column forming water gas in known manner. As a result, not only the heat content of the glowing coke is re-extracted, but the high temperature ofthe coke is utilized to produce a valuable product, vizwater gas,

In order to obtain themaximum economy, the steam is circulated only in the alread preliminarily cooled part of ,thecoke co umn, the excess steam produced by the hotter layers of coke being passed therethrough on the contra-flow principle and thus a high grade water gas is produced in a, continuous stream. This method .of dry cooling of coke is preferably used in conjunction with a retort for obtaining gas from fresh coal. The hot water-gas produced is led wholly or partly through the coal in contrafiow and the heat required for gas makmg is pro-' duced by the addition of-ox ygenor air.

Processes according to which a cool ng 5 medium circulates between a column of coke to be cooled and a heat exchange apparatus.

are known per se. In such processes, however, the cooling medium does not chan e in the course of the process and serves 0 y' 40 as a heat carrier which transfers theheat given up by the coke to a steam boiler. Under the present process the cool ng medium comes into direct contactwith the water to be evaporated and according] itself takes up the steam produced, the coo ing medium therefore is always newly supplementedja'nd in dependence on the repeated production of fresh steam, the excess of steam forced into the. hotter layer of coke where in known manner water-gas is formed.

It has alread been proposaed gzioemploy y ra mg cemen process of coo ing and I clinker in a cooler. For this purpose' am1xture of air and steam is led throu h a cooler 66 which contains the. cement clin or to be cooled andthence through an evaporator. In this cooler the cooling and hydrating of the clinker is effected by the mixture which, n turn, slheated. In the evaporator steam is againlproduccd .b the heated air and steaml'ml' xture by in irect transfer of heat tothe water, whichlsteam, together with the mixture, returnsvto. the cooler. In this circulat on any excess steam produced escapes. into the atmosphere. g

The present process,however, deals with the vcool ng- 0f coke by means of a gas and steamgmixtuie with the simultaneous productioniof water.gas.- The mixture of gas and steam .circulating in the cooling zone of the coke c olumn cools the coke here and, at the same time, the excess steam carried with it is forced into the hotter part of the coke column located above the cooling zone, and water gas produced in the coke column by means of suchsteam y I 7 One form of apparatus for dry cooling of coke and, fortheproduction of water-v according to the resent process is illustrated in Flg. 1; of t e accompanying drawin F1g.; 2 shows a retort for the continuous coolng of-cokeand the production of illuminatmg gas, 1n accordance with the invention.

Fig. 2 shows anotherform of a continuous vforces iti into the u per part where in known manner it trickles t rough the chamber after the manner'of a gas washer. f is a fanor blower gwhich draws -j the steam (or, inhthe first stage, the air) from the lower part of the, saturator in acontinuous stream and forces it upwards into the already preliminarily cooled coke column. In consequence of the suction action. reduced in the saturator by the blower"- the steam is drawn from the lower coke cooling chamber through the pipe into the saturator and thus, ,a continuously, circulating current of steam isfproduced between the lower art of the coke chargeand the saturator. his steam serves as a heat conductor since it is heated in the coke column to the desired temto the water circulatin in the saturator d and evaporates this water to an extent dependent on the transfer of heat.. The water va our'thus continuously freshly produced is orced through the hot coke column above the branch 9 in contra-flow to the passage of the coke'or to the temperature drop in the coke column and is here in known manner converted into water-gas. The heat of the coke in the lower preliminarily cooled part of the coke column (extending to the pipe g) serves thus only for the generation of steamwhile the heat of the upper hot column'of coke is utilized to the fullest extent in the formation of water-gas by virtue of the adoption of the contra-flow princi le.

In order to obtain uniform distribution of the steam being circulated over the whole cross section of the coke column the quencher is suitabl at the level of the branch pipe 9 so as to orm an annular channel is through which the steam being circulated is drawn Adjacent the steam generating zone service doors Z and horizontal supportin bars m are provided. On these bars may e ar-' ranged emergency bars 12. to permit of partial discharge. 1

With the discharge valve 0 is connected a grate p which moves with the valve when the latter is opened. .The circulating steam .is introduced between the valve 0 and the grate a steam will enter the coke column uniformly distributed.

A. modification of this method consists in arranging the coke cooling device as a direct continuation of a continuously operated gas retort and passing the hot wateras roduced direct through the column 0 coa to be distilled. There is thus obtained a continuously operating retort for producing as and also for cooling the coke produced, m which retort in a continuous operation the fresh coal is introduced above and the cooled coke withdrawn below. 'The whole of they conversion of heat in the operation of coal distillation and production of water-gas are thus efiected directly in the retortand in a direct manner whereby several advantages result such'as intensive heat exchange and improvement of the distillation roduct and of the coke. In order to sup i} the additional heat necessary for distllling the fresh coal a art of the water-gas is burned in the retort y introducing at convenient points of the retort oxygen or air in such quantity that by the combustion of the part of the water-gas the necessary additional heat requirementa of the retort are met.

diagrammatically a continuously operable distilling retort constructed to carry out this method.v .In this figure the reference characters a, d, e, f, g,

In Fig. 2 is illustrated referably enlarged at its lower end.

the grate serving to ensure that the h, k and 0, indicate the same parts as they do in Fig. 1. The gas makin part of the retort a, in which the distil ation of the coal as well as the production of water-gas is effected, is for that reason made considerably larger than the lower steam generating zone, 9 indicates a bunker built on the retort and made gas tight from which fresh coal passes to the retort as-ythe other material passes through so that the column of coal is always of the same height. At the lower end of the retort is rovided also a gas-tight bunker rin whic the cooled coke is collected and from which it is discharged from time to time. 7

The output is regplated by providing at the lower end a fee 'ng device consistin feed wheels with feeding armsmounte on a shaft .9 carried in external bearings and rotated in direction of the arrow. In order to prevent the arms from moving the coke horizontally, which is dangerous and interferes with the passage of the material,

movement over the edges of the p ate. Feed-- may also I be efiected by providing the I i tii le' with projections ,(lugs etc.) and movmg it to and fro asv a whole. n: denotes a plate or the like arranged in the bunker and which, when the bunker r is full, is moved by the coke passin downwardl the movement'being utilize ina suitab a manner for actuating an alarm device. 1: indicates the'oxygen or air su ply'conduit referred to above, which .is s own as located above the boshes k. The pipe 3 re resents another convenient means where y the oxygen or air may be introduced at a different level. 2 is a regulating device, not show in detail, for the supply of oxygen. ThlS regulator is preferably controlled by the temperature conditions in the retort.

A further method of controlling local tomperature conditions in the retort consists 10 gas to pass throug lower portion of the column to the top therea gaseous carrier medium, chemically inert with respect to the coke, throu h the lower portion only of a vertical co umn of the coke, the upper portion of the column being at a temperature suflicient to carry out the water gas reaction;'injecting into the c1rculating gaseous medium, while out of contact with the coke, a spray of water to 0001 said medium and to reduce steam;'a1lowing the column from the of; and withdrawing at the top of the column the water gas formed by the reaction of the steam with the hot coke.

2. In combination with the method set 16 forth in claim 1, the additional feature of continuously introducin hot coke to the to of the column an discharging cool co e from the bottom of the column.

In testimony whereof I have signed my name to this specification.

REINHARD WUSSOW.

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