METHOD AND APPARATUS FOR IMPROVING HYDROGEN UTILIZATION RATE OF HYDROGENATION APPARATUS

摘要

A method and apparatus for improving a hydrogen utilization rate in a hydrogenation hot high-pressure separation process. Hydrogenated distillate oil, a gas product and hydrogen pass through an inertia separation distributor arranged in an inlet of a hot high-pressure separator under high pressure for preliminary gas-liquid separation, and a gas phase goes to a subsequent system; a liquid phase goes into a hot low-pressure separator. Releases a part of low-pressure separated gas (mainly hydrogen) after preliminary separation through an injection flash separator in the hot low-pressure separator, and is divided into a gas phase and a liquid phase based on gravitational settling; hydrogen and some micro bubbles that are still dissolved in hot low-pressure separated oil under the pressure are separated from the oil through a centrifugal degassing device; the gas phase exits from the apparatus after carried liquid droplets are removed completely through hydrocyclone separation or coalescence separation, and distillate oil goes to a subsequent facility.

主权项

1. A method for improving the hydrogen utilization in a hydrogenation high pressure hot separation process, characterized in that, it comprises the following steps:
Step 1: distillate oil and hydrogen mixture undergo high pressure separation, comprising the following steps: Step 1.1: the distill oil and hydrogen mixture undergoes inertial separation of distribution to realize initial gas-liquid separation, and the gas-liquid mixture after separation is radially uniformly distributed in a hot high-pressure separator, wherein the pressure drop of the inertial separation is 0.0001-0.01 MPa; Step 1.2: the gas-liquid mixture after inertia separation undergoes a second gas-liquid separation via gravity settling; Step 2: the liquid phase after high pressure separation undergoes hot low-pressure separation, comprising the following steps: Step 2.1: the gas phase dissolved in the liquid phase is separated via jet flash, wherein the pressure drop is no higher than 0.01 MPa; Step 2.2: the gas-liquid mixture after jet flash further undergoes gravity settling in order to separate the gas and the liquid phase, and the separated liquid phase undergoes second degassing through a centrifugal degassing device, wherein the degassing is carried out via hydrocyclone separation or pressure gradient, wherein the pressure difference within the pressure gradient field is 0.01-10 Mpa.