DELAYED COKING PROCESS AND APPARATUS
First Claim
1. A process for producing a petroleum coke product in a delayed coking system, said delayed coking system including a plurality of coking drums with said process comprising each said coking drum operating in alternating cycles including a fill cycle followed by a second cycle, wherein during said fill cycle a drum feed material is delivered into said coking drum to form said coke product therein and produce a vapor product which is delivered to a product fractionator, and wherein said drum feed material is not delivered into said coking drum when said coking drum is operating in said second cycle, said process further comprising the step in said second cycle of removing from said coking drum said coke product which has been formed in said coking drum without quenching said coke product with water or other quenching liquid in said coking drum and without cutting said coke product in said coking drum such that, when removed from said coking drum in said step of removing said coke product is a flowable material which flows out of said coking drum in solid form.
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Abstract
A delayed coking process and apparatus which greatly shorten the required duration of the alternating drum fill and decoking cycles and eliminate the need to perform drum quenching, draining, unheading, hydraulic decoking, reheading, pressure testing, and warming procedures in the decoking cycle. In the inventive system, the decoking cycle preferably comprises simply a steamout stage and a coke product draining procedure. The coke product produced in the coking drums is a hot, solid, flowable material from which heat can be recovered for preheating the coker feed and/or producing steam.
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Citations
25 Claims
- 1. A process for producing a petroleum coke product in a delayed coking system, said delayed coking system including a plurality of coking drums with said process comprising each said coking drum operating in alternating cycles including a fill cycle followed by a second cycle, wherein during said fill cycle a drum feed material is delivered into said coking drum to form said coke product therein and produce a vapor product which is delivered to a product fractionator, and wherein said drum feed material is not delivered into said coking drum when said coking drum is operating in said second cycle, said process further comprising the step in said second cycle of removing from said coking drum said coke product which has been formed in said coking drum without quenching said coke product with water or other quenching liquid in said coking drum and without cutting said coke product in said coking drum such that, when removed from said coking drum in said step of removing said coke product is a flowable material which flows out of said coking drum in solid form.
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19. An apparatus for delayed coking comprising:
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a flash vessel wherein a petroleum feed stream will separate into a flash vapor product stream and a flash liquid product stream; a fired heater through which said flash liquid product stream will be delivered and heated to a coking temperature; a plurality of delayed coking drums which will receive said flash liquid product stream at said coking temperature in alternating cycles to produce a coke product and a cracked vapor product; and a heat exchanger through which said coke product from said delayed coking drums will flow in solid form for recovering heat from said coke product. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification