Coke quenching apparatus

Details Coke quenching apparatus Coke quenching apparatus

1986-12-17

1988-05-10

Richman, Barry S.

Distillation: apparatus

Apparatus

Types

202230, C10B 3914

Patent

active

047433426

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS

This application is a national phase application corresponding to PCT/EP86/00147 filed 15 Mar. 1986 and based, in turn, on a German national application No. P35 10 678.6 filed 23 Mar. 1985 under the International Convention


FIELD OF THE INVENTION

The present invention relates to a method of quenching coke and to an apparatus needed to carry out this method.


BACKGROUND OF THE INVENTION

Up to now two basically different methods of quenching incandescent coke have been used, i.e. the so-called wet quenching and the so-called dry quenching methods.
In the dry quenching method, of which several different alternatives were disclosed in Gluckauf 114 (1978), on pages 611/619, the sensible heat of the coke is abstracted either by direct or indirect heat exchange and mostly recovered. The coke is discharged from the plant at temperatures comprised between 150.degree. C. and 250.degree. C.
The direct heat exchange is provided by circulated gas whose heat energy is recovered by the heat exchange cycle.
An exclusively indirect cooling requires long residence times so that to ensure sufficient cooling capacity large heat exchange volumes are necessary.
Capital and operational costs of coke dry quenching plants are comparatively high.
While sizeable gaseous emissions do not develop with these systems, they involve serious practical drawbacks which require solution and relate to the development of large dust volumes during handling of the dry-quenched coke.
With wet quenching of coke according to the present state of the art the coke is cooled by evaporation of the sprayed water. Caused by thermal buoyancy, particulate emissions are produced during this treatment which may with modern quenching towers attain an order of magnitude of 50 g/t of coke. Besides there are gaseous emissions, e.g. in the form of hydrogen sulphide and carbon monoxide, as products of chemical reactions between the hot coke and water. Such reactions, if they occur at temperatures above 800.degree. C., lead to conspicuous pollutant emissions.


OBJECT OF THE INVENTION

The object of the present invention is to provide an apparatus which will avoid these drawbacks of the known coke quenching methods.


SUMMARY OF THE INVENTION

These drawbacks are effectively avoided, indeed, by coke quenching.
In a first step, cooling the coke to below approx. 900.degree. C., possibly to between 700 and 900.degree. C., by means of an indirect heat exchanger, and then quenching the coke to ambient temperature in a second step involving the spraying of water. During the first step steam or hot water is produced. The apparatus used can comprise a mobile coke receptacle equipped with cooling faces for indirect heat exchange as well as with closing separate discharge openings for water and coke. The cooling surfaces are formed to function as indirect water coolers or as steam-generate units. The coke receptacle can be equipped with a lid.
The dust evaluation typical for a conventional dry quenching installation is not encountered with the method as per the invention as the coke which had been pre-cooled during the first process step, is wetted uniformly during the second step so that any dust development during coke handling is subdued. At the same time the coke temperature is brought down, prior to wet quenching, far enough as to essentially subdue any reactions taking place at an accelerated pace if higher temperatures prevailed. Thermal buoyancy of the wet quenching phase is mitigated as well so that there is also a noticeable reduction of particulate emission.
Cost expenditure is lower as compared to coke dry quenching. As with the latter, part of the sensible coke heat may be recovered though so that its reuse will likewise contribute to the economics of the method.


BRIEF DESCRIPTION OF THE DRAWING

A more detailed illustration of the procedure is given by way of the following examples. In the drawing:
FIG. 1 is a process flowsheet.
FIG. 2 is a plan view of an embodiment of the coke receptacle, seen from above;
FIG. 3

REFERENCES:
patent: 4010695 (1977-03-01), Mantione
patent: 4213489 (1980-07-01), Cain
patent: 4285772 (1981-08-01), Kress
patent: 4312711 (1982-01-01), Brown et al.
patent: 4396461 (1983-08-01), Neubaum et al.

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