CN-117186938-B - Catalytic cracking coke generator, regeneration system and regeneration method

Abstract

The application relates to a catalytic cracking coke generator, a regeneration system and a regeneration method, wherein the coke generator sequentially comprises a pre-lifting area and a reaction area from bottom to top, the reaction area is a bubbling fluidized bed or a turbulent fluidized bed, and an outlet area, the pre-lifting area is communicated with the bottom end of the reaction area and the regenerator, the top end of the reaction area is communicated with the outlet area, and at least one fuel oil feed inlet is arranged at the outlet of the pre-lifting area or at the lower part of the reaction area. When the coke generator and the system are used for the fluid catalytic cracking reaction with larger heat of reaction, a coke source can be provided for the regenerator from the reaction system, so that the problem of heat balance of reaction is solved, the regeneration process is not influenced, and the physical and chemical properties of the catalyst are not damaged.

Inventors

• ZHANG ZHIGANG
• WEI XIAOLI
• CUI YAN
• Qiao Ruiqi

Assignees

• 中国石油化工股份有限公司
• 中国石油化工股份有限公司石油化工科学研究院

Dates

Publication Date

20260505

Application Date

20220531

Claims (16)

1. 1. The utility model provides a catalytic cracking coke generator which characterized in that, the coke generator includes from the bottom up in proper order: A pre-lifting area is provided for the pre-lifting area, A coking reaction zone which is a bubbling fluidized bed or a turbulent fluidized bed, and An outlet region for the fluid to flow from the fluid outlet, The top end of the pre-lifting area is communicated with the coking reaction area, and the top end of the coking reaction area is communicated with the outlet area; the bottom end of the pre-lift zone and/or the bottom end of the coke-producing reaction zone is configured to communicate with a regenerator for delivering the catalyst of the regenerator to the coke-producing reactor; at least one fuel oil feed inlet is arranged at the upstream of the coking reaction zone; The coke generator is sequentially provided with a pre-lifting gas inlet, a catalyst inlet and one or more fuel oil inlets from bottom to top, pre-lifting gas is injected into the pre-lifting zone through the pre-lifting gas inlet, and The one or more fuel oil inlets are each independently disposed at the outlet end of the pre-lift zone or at the bottom or side wall of the raw coke reaction zone; The pre-lift gas is selected from steam, nitrogen, dry gas, rich gas, carbon four fraction or combination thereof, and the mass ratio of the pre-lift gas to the fuel oil is 0.01:1 to 0.05:1; the linear speed of a coking reaction zone of the coking device is 0.3 m/s-1.2 m/s, and the density of catalyst particles is 300 kg/cubic meter-700 kg/cubic meter.
2. 2. The catalytic cracker of claim 1, wherein the one or more fuel oil inlets are each independently 5% to 15% of the distance of Jiao Qigao degrees from the bottom of the cracker.
3. 3. The catalytic cracker of claim 1, wherein one or more of the coking reaction zones is hollow cylindrical with an aspect ratio of from 20:1 to 2:1.
4. 4. The catalytic cracking coke generator of claim 3, wherein, The pre-lifting area is hollow cylindrical, and the length-diameter ratio of the pre-lifting area is 10:1-2:1; the outlet zone is hollow cylindrical and has an aspect ratio of 30:1 to 5:1.
5. 5. The catalytic cracker of claim 4, wherein the ratio of the inner diameters of the pre-lift zone, the raw coke reaction zone, and the outlet zone is from 1:2:1 to 1:10:2.
6. 6. The catalytic cracker of claim 1, wherein the outlet zone of the cracker is configured to be in fluid communication with a gas-solid separation and collection device, wherein the gas-solid separation and collection device is in communication with a product separation system and the regenerator, respectively, such that reaction oil gas and coke-bearing catalyst produced by the cracker are introduced into the product separation system and the regenerator, respectively, after separation by the gas-solid separation and collection device.
7. 7. A catalytic cracking regeneration system comprising: The catalytic cracking coke breeder of any one of claims 1-6; gas-solid separation and collection device, and The regeneration device comprises a regenerator, a first heat exchanger, a second heat exchanger, a third heat exchanger and a, Wherein the bottom end of the pre-lift zone and/or the bottom end of the coke making reaction zone is configured to communicate with a regenerator for delivering the regenerator catalyst to the coke making reactor; The outlet area of the catalytic cracking coke generator is in fluid communication with the gas-solid separation and collection device, so that the materials from the coke generator are separated into oil gas and a catalyst with coke through the gas-solid separation and collection device; The gas-solid separation and collection device is in communication with the regenerator such that the coked catalyst is delivered to the regenerator.
8. 8. The catalytic cracking regeneration system of claim 7, wherein the gas-solid separation and collection device comprises: the gas-solid separation device is communicated with the outlet area of the catalytic cracking coke generator, so that materials from the coke generator are separated into oil gas and a catalyst with coke through the gas-solid separation device; A settler configured to collect the coked catalyst, the settler in communication with the regenerator such that the coked catalyst is delivered to the regenerator.
9. 9. The catalytic cracking regeneration system according to claim 8, wherein the gas-solid separation device is housed inside the settler, The settler includes a stripping section at a lower portion of the settler, the stripping section configured to strip collected coked catalyst, and the regenerator is in communication with the stripping section such that stripped coked catalyst is transferred to the regenerator.
10. 10. A method of regenerating a catalytic cracking catalyst, carried out in the catalytic cracking regeneration system according to any one of claims 7 to 9, comprising the steps of: Injecting a pre-lift gas into a pre-lift zone of the coke making machine via a pre-lift gas inlet, in contact with regenerated catalyst from the regenerator; Injecting a mixture of an atomization medium and fuel oil into the coke generator through a fuel oil inlet, enabling the mixture of the atomization medium and the fuel oil to contact with a catalyst in the coke generator, and carrying out a coke generation reaction to obtain a catalyst with coke and reaction oil gas; The catalyst with coke and the reaction oil gas are separated by a gas-solid separation collecting device, the separated catalyst with coke is introduced into a regenerator, and the regenerated catalyst is regenerated for recycling.
11. 11. The regeneration process of claim 10, further comprising subjecting the coked catalyst to a stripping treatment, the stripped catalyst being introduced into the regenerator.
12. 12. The regeneration method according to claim 10, wherein the atomizing medium is nitrogen gas and the mass ratio of the atomizing medium to the fuel oil is 0.01:1 to 0.5:1.
13. 13. The regeneration method according to claim 10, wherein the fuel oil is selected from a straight distillate oil or a secondary processing distillate oil.
14. 14. The regeneration process of claim 13, wherein the secondary processing distillate is selected from one or more of catalytic pyrolysis diesel, catalytic pyrolysis slurry, coker gasoline, coker diesel, and coker wax oil.
15. 15. The regeneration process of claim 10, wherein the outlet temperature of the coke generator is 460-560 ℃.
16. 16. A catalytic cracking coke making system comprising the coke making apparatus of any one of claims 1-6.

Description

Catalytic cracking coke generator, regeneration system and regeneration method Technical Field The application relates to the technical field of fluidized catalytic cracking, in particular to a catalytic cracking coke generator, a regeneration system and a regeneration method which are suitable for maintaining heat balance. Background The fluidized catalytic cracking reaction process is an autothermal equilibrium process, and the catalyst scorching regeneration process releases a large amount of heat energy at high temperature so as to just meet the requirements of the cracking reaction process at lower temperature. The catalyst circulating between the reactor and the regenerator has a sufficient amount and heat capacity so that the catalyst can act as both an active site for the reaction and a heat carrier for transferring heat energy. The catalyst flows between the reactor and the regenerator, constantly taking heat from one end and supplying heat to the other. The establishment of the thermal equilibrium requires certain conditions on the basis of which the cracking and regeneration are maintained up to the prescribed temperature. For a catalytic cracking industry, the thermal balance between the reactor and the regenerator is based on the fact that the reaction produces sufficient coke that burns during regeneration to release heat for the reaction. Along with the development of oil refining technology, particularly the heavy/inferior trend of crude oil is aggravated, and the quality of oil is improved, so that the hydrogenation technology is widely applied. When the raw material subjected to hydrogenation upgrading is used as a catalytic cracking raw material, although the structure and quality of the product are greatly improved, the catalytic cracking device brings the problems of insufficient coking and insufficient heat supply. In addition, in the catalytic cracking technology using low-carbon olefin as a main target product, the cracking reaction conversion rate is high, the reaction temperature is high, the reaction heat is large, more heat is required in the reaction aspect than that of a conventional fluidized catalytic regenerator or other catalytic conversion methods, and the coke generated by self-cracking cannot always meet the self-heat balance requirement of a reaction-regeneration system. When coke formation is insufficient in the reaction process, a mode of supplementing fuel oil to the outside of the regenerator is generally adopted to provide the required heat for the reaction. However, as the catalytic cracking adopts the catalyst with the molecular sieve as an active component, the aluminum of the molecular sieve framework is gradually removed by the local high temperature generated by the combustion of the fuel oil in the regenerator, so that the catalyst is damaged, the damage is irreversible, and the influence of the high-temperature hot spot generated by the local combustion of the external fuel oil on the catalyst framework structure and the reaction performance is not fundamentally solved. To solve this problem, the prior art solutions have all been based on a regenerator system, such as an oxygen-lean zone in the regenerator, introducing fuel oil into the oxygen-lean zone to mix with the catalyst and enter the regenerator for char-burning regeneration, or a heater arranged in the regenerator and employing a fuel nozzle configured to inject a mixture of fuel and oxygen-containing gas for combustion to supplement heat, or methane to supplement heat for the reaction by virtue of the combustion heat release of methane. The heat supplementing mode in the technology can relieve adverse effects on the catalyst, but does not fundamentally solve the influence of high-temperature hot spots generated by local combustion of the external fuel oil on the skeleton structure and the reaction performance of the catalyst. Disclosure of Invention The application aims to provide a catalytic cracking coke generator, a coke generating system and a method, which solve the problem of heat balance in the catalytic cracking reaction process from the aspect of a reaction system and do not influence the physical and chemical properties of a catalyst. In one aspect, the present application provides a catalytic cracking coke generator, comprising, in order from bottom to top: A pre-lifting area is provided for the pre-lifting area, A coking reaction zone which is a bubbling fluidized bed or a turbulent fluidized bed, and An outlet region for the fluid to flow from the fluid outlet, The top end of the pre-lifting area is communicated with the coking reaction area, and the top end of the coking reaction area is communicated with the outlet area; the bottom end of the pre-lift zone and/or the bottom end of the coke-producing reaction zone is configured to communicate with a regenerator for delivering the catalyst of the regenerator to the coke-producing reactor; at least one fuel oil feed inlet is arranged a