Method for inhibiting hydrocracking temperature runaway by using reaction pressure
A technology of reaction pressure and hydrocracking, which is applied in the fields of hydrocarbon oil cracking and petroleum industry, can solve the problem of reaction pressure drop and achieve the effect of suppressing and avoiding overheating
Inactive Publication Date: 2014-01-01
PETROCHINA CO LTD
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Embodiment 1
[0026] In a CNPC hydrocracking unit referred to in this example, the cracking catalyst is mainly an amorphous type that is not easy to overheat, mixed with a small amount of molecular sieve, and the critical point of reaction pressure is 80.16% of the total reaction pressure, that is, the normal reaction pressure is 14.5Mpa. The reaction pressure critical point is 11.623Mpa.
Embodiment 2
[0028] The reaction pressure of a hydrocracking unit is 15.7Mpa, and the critical point of the reaction pressure is 80.16% of the total reaction pressure, so the critical point should be 12.585Mpa.
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The invention relates to a method for inhibiting hydrocracking temperature runaway by using reaction pressure. According to the present invention, before temperature runaway of a reactor bed layer is generated, reduction of the key parameter reaction pressure is utilized to timely interlock stopping of reaction material feeding and main gas of a heating furnace so as to reduce the temperature of reactor materials from the source, and achieve in advance braking of reactor temperature control, such that the heavy temperature runaway and pressure relief interlock caused by the reaction bed layer is avoided, wherein the reaction pressure is set at 80-88% of the normal reaction pressure; and the reaction furnace is directly stopped in the interlock manner when the reaction pressure is close to the critical point, such that temperature reduction on the feeding material of the reactor is achieved so as to inhibit temperature runaway possibly generated by the reactor bed layer.
Description
technical field [0001] The invention relates to a method for suppressing hydrocracking temperature runaway by using reaction pressure. By optimizing the interlocking logic of the hydrocracking reactor temperature, it is ensured that the reactor can be timely and automatically suppressed in an unstable state of operation. In order to realize the safety, stability and control of the device. Background technique [0002] The general process of the oil hydrocracking unit is that the high-pressure feed pump 1 boosts the pressure of the oil from the low-pressure system, and then mixes it with circulating hydrogen, and passes through the reaction effluent / reaction feed heat exchanger 6 (usually called high-pressure heat exchange After the temperature is raised by the reaction heating furnace 4, it is heated to the temperature required by the reaction and then enters the hydrofining and cracking reactor 5. The reaction effluent is preheated by the high-pressure heat exchanger 6 and ...
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IPC IPC(8): C10G47/36
Inventor 任斌
Owner PETROCHINA CO LTD
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