Fixed fluidized bed reactor for test

Abstract

A fixed fluidized bed reactor for tests comprises a cylindrical settling section [I] and an inverted conical reaction section [II]; the cylindrical settling section [I] and the inverted conical reaction section [II] are of a same diameter and are fixedly connected; an upper end of the cylindrical settling section [I] is sealed by a top cover flange [1]; the fixed fluidized bed reactor for tests also comprises a cooling medium inlet tube [8] and a cooling medium distributor [12] used for cooling materials in the reactor, a concentric combined casing pipe composed of a raw material oil inlet pipe [6], an atomized steam inlet pipe [14], and a heat insulation pipe [15], a grid plate [16] with a conical projection, and a conical plug valve [19] for discharging catalysts from the bottom. The reaction is applicable to both catalytic cracking and catalytic pyrolysis reactions, has the characteristics of a constant charging temperature and state, good raw material oil atomization, full agent-oil contact, complete agent discharging, a stable reaction pressure, and wide raw material application scope, can increase the security of the test process, and the accuracy and repeatability of test results.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and mainly relates to a fixed fluidized bed reactor used for experimental research. Background technique [0002] The catalytic cracking process is a heavy oil lightening process that converts heavy oil into light products such as gasoline, diesel and liquefied gas. It has the characteristics of strong raw material adaptability, high yield of target products, and good economic benefits. One of the core secondary processing techniques. The catalytic cracking process is a new technology for the production of olefins developed on the basis of the catalytic cracking process. It follows the mature process of catalytic cracking and uses high temperature, large ratio of fuel to oil, short residence time and special catalysts to produce gas products mainly including ethylene and propylene. , has become an important means to realize the integration of refining and chemical industry and imp...

AI Technical Summary

Problems solved by technology

However, there are two common technical defects in these two patents: one is that the grid plate in the reactor is a flat plate structure with holes, and it is easy to accumulate on the upper surface of the unopened part of the grid plate during the fluidization process of the catalyst, causing some The catalyst cannot react with the raw material, which affects the accuracy of the test data and the cleanliness of the unloading agent; second, the outlet temperature of the reaction oil and gas is high, and the unsaturated components in it are easy to polymerize and coke on the outer surface of the filter, blocking the micropores of the filter Road, causing the reactor pressure to rise, directly affecting the accuracy and safety of the test

The fixed fluidized bed reactor described in CN201064712Y is an improved type of CN 2512495Y, and the difference is that the upper part of the latter's settling section is changed from a cylindrical shape to a circular truncated shape, so as to improve the linear velocity of the reaction oil and gas at the upper high-temperature part and shorten the middle of the reaction. The coexistence time of the product in the dilute phase section of the catalyst can effectively inhibit the polycondensation reaction between small molecular olefins, but the reactor has unclean unloading, the accumulation of catalyst on the surface of the grid plate, and the coking of reaction oil and gas on the outer surface of the filter The problem

However, the common disadvantages of these two patents are: the catalyst inlet and the agent unloading port are the same port on the top of the reactor, and the reacted catalyst is not easy to unload; the feed inlet is located below the distribution plate and close to the distribution plate, and the When the oil is sprayed onto the lower surface of the high-temperature distribution plate, it is easy to cause adhesion and cause coking, which affects the full contact between the raw material oil and the catalyst

In addition, CN201143427Y sprays 0.1mol / L aluminum chloride solution into the reactor through the regeneration solution spray head located on the top of the reactor, which may easily cause the high-temperature catalyst particles to collapse and have a great impact on the performance of the catalyst

[0004] In summary, the existing several typical fixed fluidized bed reactors, in the position of the feed port and the unloading port, the form of the grid plate, the feed temperature and state maintenance, and the suppression of coking of the reaction oil and gas filter There are more or less certain limitations in terms of

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