阅读说明：本技术 一种半循环式fcc催化剂喷雾干燥系统 (Semi-circulating FCC catalyst spray drying system ) 是由 赵旭 杨柳 谭永鹏 王慧 张旭 王晓伟 沈延顺 董清生 李珺涛 谢晓玲 符荣华 于 2020-05-28 设计创作，主要内容包括：本发明公开了一种半循环式FCC催化剂喷雾干燥系统,包括热风炉、喷雾干燥塔、料仓、自分离器、循环风机和引风机,热风炉上设置有天然气入口、空气入口、尾气入口一和通入回流干燥尾气的尾气入口二,其中尾气入口二通过回流管路连接自分离器,热风炉上的混合载气出口通过管路连接喷雾干燥塔,喷雾干燥塔内通入有雾化形成的FCC催化剂雾滴小球,喷雾干燥塔连接自分离器,喷雾干燥塔底部连接料仓；自分离器上连接有尾气排放管路,尾气排放管路上设置有引风机；本发明能够回收利用尾气的热量并降低尾气排放量,降低了后续尾气处理设备规格,减少了投资；同时,可以灵活调整循环尾气的量,控制产品出口温度,具有操作方便、换热效率高、操作弹性大等优点。(The invention discloses a semi-circulating FCC catalyst spray drying system, which comprises a hot blast stove, a spray drying tower, a storage bin, a self-separator, a circulating fan and a draught fan, wherein a natural gas inlet, an air inlet, a tail gas inlet I and a tail gas inlet II for introducing reflux drying tail gas are arranged on the hot blast stove; a tail gas discharge pipeline is connected to the self-separator, and an induced draft fan is arranged on the tail gas discharge pipeline; the invention can recycle the heat of the tail gas and reduce the tail gas emission, thereby reducing the specification of subsequent tail gas treatment equipment and reducing the investment; meanwhile, the amount of the circulating tail gas can be flexibly adjusted, the outlet temperature of the product is controlled, and the device has the advantages of convenience in operation, high heat exchange efficiency, large operation elasticity and the like.)

1. A semi-cycle FCC catalyst spray-drying system, characterized by: the self-separation device comprises a hot blast stove, a spray drying tower, a storage bin, a self-separation device, a circulating fan and an induced draft fan, wherein a natural gas inlet for introducing natural gas, an air inlet for introducing combustion air, a first tail gas inlet for introducing roasting tail gas and a second tail gas inlet for introducing backflow drying tail gas are arranged on the hot blast stove, the second tail gas inlet is connected with the self-separation device through a backflow pipeline, a mixed carrier gas outlet is also arranged on the hot blast stove and is connected with the spray drying tower through a pipeline, FCC catalyst droplet beads formed by atomizing FCC catalyst slurry are introduced into the spray drying tower, the spray drying tower is connected with the self-separation device through a pipeline, and the bottom of the spray drying tower is connected with the storage bin; the automatic separator is connected with a tail gas discharge pipeline, a draught fan is arranged on the tail gas discharge pipeline, and a material outlet is further formed in the bottom of the automatic separator.

2. The semi-circulating FCC catalyst spray-drying system of claim 1, wherein: the mixed carrier gas outlet is arranged at the top of the hot blast stove.

3. The semi-circulating FCC catalyst spray-drying system of claim 1, wherein: the mixed carrier gas is introduced from the top of the spray drying tower.

4. The semi-circulating FCC catalyst spray-drying system of claim 1, wherein: the top of the spray drying tower is provided with a spray head, and FCC catalyst slurry from the previous process is atomized by the spray head under 2-20 MPa to form FCC catalyst droplet pellets which are sprayed into the cylinder of the spray drying tower.

5. The semi-circulating FCC catalyst spray-drying system of claim 1, wherein: the top of the spray drying tower is provided with a spray head, FCC catalyst slurry from the previous process is centrifugally atomized to form FCC catalyst droplet pellets, and the FCC catalyst droplet pellets are sprayed into the cylinder of the spray drying tower.

Technical Field

The invention relates to the technical field of industrial catalytic cracking catalyst preparation process flow and energy conservation, in particular to a semi-circulating FCC catalyst spray drying system.

Background

In the FCC catalyst device, a drying unit adopts a spray drying tower to pre-dry FCC catalyst slurry, the drying mode belongs to hot air type drying, the temperature of tail gas can reach 180 ℃ at most, the heat quantity taken away by the direct emission of the tail gas is higher, and the heat loss is more. The single production line of the traditional FCC catalyst device in China has small capacity, and the drying unit still adopts a spray drying tower to pre-dry FCC catalyst slurry along with the large-scale development of the FCC catalyst device at present, and because the capacity is enlarged, if an open process technology with single tail gas emission is adopted, the waste heat taken away by the tail gas is more, and the heat loss is more serious. In order to meet the technical requirements of the existing energy-saving and environment-friendly process, an energy-saving process scheme is required.

Therefore, the design of a reasonable, simple and efficient drying process is required, and the urgent need in the field is provided.

Disclosure of Invention

The invention aims to provide a semi-circulating FCC catalyst spray drying system, which is used for solving the problems in the prior art, recycling the heat of tail gas, reducing the tail gas emission, reducing the specification of subsequent tail gas treatment equipment and reducing the investment; meanwhile, the amount of the circulating tail gas can be flexibly adjusted, the outlet temperature of the product is controlled, and the device has the advantages of convenience in operation, high heat exchange efficiency, large operation elasticity and the like.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides a semi-circulating FCC catalyst spray drying system, which comprises a hot blast stove, a spray drying tower, a storage bin, a self-separator, a circulating fan and a draught fan, wherein a natural gas inlet for introducing natural gas, an air inlet for introducing combustion air, a tail gas inlet I for introducing roasting tail gas and a tail gas inlet II for introducing reflux drying tail gas are arranged on the hot blast stove, the tail gas inlet II is connected with the self-separator through a reflux pipeline, a mixed carrier gas outlet is also arranged on the hot blast stove, the mixed carrier gas outlet is connected with the spray drying tower through a pipeline, FCC catalyst droplet pellets formed by atomizing FCC catalyst slurry are introduced into the spray drying tower, the spray drying tower is connected with the self-separator through a pipeline, and the bottom of the spray drying tower is connected with the storage bin; the automatic separator is connected with a tail gas discharge pipeline, a draught fan is arranged on the tail gas discharge pipeline, and a material outlet is further formed in the bottom of the automatic separator.

Preferably, the mixed carrier gas outlet is arranged at the top of the hot blast stove.

Preferably, the mixed carrier gas is introduced from the top of the spray drying tower.

Preferably, a spray nozzle is arranged at the top of the spray drying tower, and the FCC catalyst slurry from the previous process is atomized by the spray nozzle under 2-20 MPa to form FCC catalyst droplet pellets which are sprayed into the cylinder of the spray drying tower.

Preferably, the top of the spray drying tower is provided with a spray nozzle, and FCC catalyst slurry from the previous process is centrifugally atomized to form FCC catalyst droplet pellets which are sprayed into the cylinder of the spray drying tower.

Compared with the prior art, the invention has the following beneficial technical effects:

according to the semi-circulating FCC catalyst spray drying system provided by the invention, high-temperature flue gas is used as a drying heat source, and the dried tail gas is recycled, so that the emission of the tail gas is reduced while the heat of the part of the discharged flue gas is recovered, the specification of subsequent tail gas treatment equipment is reduced, and the investment is reduced; meanwhile, the amount of the circulating tail gas can be flexibly adjusted, the outlet temperature of the product is controlled, and the device has the advantages of convenience in operation, high heat exchange efficiency, large operation elasticity and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of a semi-cycle FCC catalyst spray-drying system according to the present invention;

in the figure: 1-hot blast stove, 2-spray drying tower, 3-bunker, 4-self-separator, 5-circulating fan, 6-induced draft fan and 7-spray head.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a semi-circulating FCC catalyst spray drying system to solve the problems in the prior art.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The semi-circulating FCC catalyst spray drying system in this embodiment, as shown in fig. 1, comprises a hot-blast stove 1, a spray drying tower 2, a storage bin 3, a self-separator 4, a circulating fan 5 and a draught fan 6, wherein the hot-blast stove 1 is provided with a natural gas inlet for introducing natural gas, an air inlet for introducing combustion air, a first tail gas inlet for introducing roasting tail gas and a second tail gas inlet for introducing reflux drying tail gas, the tail gas inlet II is connected with the self-separator 4 through a return pipeline, the top of the hot blast stove 1 is also provided with a mixed carrier gas outlet, the mixed carrier gas outlet is connected with the spray drying tower 2 through a pipeline, the mixed carrier gas is introduced from the top of the spray drying tower 2, FCC catalyst droplet balls formed by the atomization of FCC catalyst slurry are introduced into the spray drying tower 2, the spray drying tower 2 is connected with the self-separator 4 through a pipeline, and the bottom of the spray drying tower 2 is connected with the stock bin 3; be connected with the exhaust emission pipeline on the self-separation ware 4, be provided with draught fan 6 on the exhaust emission pipeline, still be provided with the material export from the bottom of separator 4.

In the embodiment, the top of the spray drying tower 2 is provided with a spray nozzle 7, and the FCC catalyst slurry from the previous process is atomized by the spray nozzle 7 under 2-20 MPa to form FCC catalyst droplet pellets which are sprayed into the cylinder of the spray drying tower 2; or, the FCC catalyst slurry forms FCC catalyst fog drop pellets after centrifugal atomization, and the FCC catalyst fog drop pellets are sprayed into the cylinder of the spray drying tower 2.

The specific implementation method of the semi-circulating FCC catalyst spray-drying system provided in this embodiment is as follows:

combustion-supporting air and natural gas enter the hot blast stove 1 to be combusted to generate high-temperature flue gas; the tail gas from the roasting system is about 600 ℃, and the dried tail gas which is about 100 percent of the emission is recycled by the circulating fan 5 after being dried is about 180 ℃, and the dried tail gas enters the furnace body from the front end and the rear end of the hot blast furnace 1 respectively, is mixed with the high-temperature flue gas generated in the hot blast furnace 1 at the tail part of the hot blast furnace 1 to be used as the mixed carrier gas of the drying system, and enters the spray drying tower 2.

FCC catalyst slurry 19m from upstream process³Uniformly atomizing to form FCC catalyst droplet pellets by a spray head 7 under the pressure of 2-20 MPa (G), and spraying the FCC catalyst droplet pellets into a cylinder body of a spray drying tower 2; meanwhile, mixed carrier gas generated by the hot air furnace 1 also enters the spray drying tower 2 and is fully contacted with the atomized FCC catalyst droplet pellets, and moisture in the FCC catalyst droplet pellets is vaporized to form FCC catalyst pellets so as to achieve the aim of drying materials.

Large particles in the dried FCC catalyst pellets fall into the bottom of the spray drying tower 2 by means of self weight and are collected into a large particle bin 3; the other small particles in the FCC catalyst pellets enter a separator along with hot air, and the collected FCC catalyst pellets are sent to a subsequent system as a product; the dry tail gas with the temperature of about 180 ℃ coming out of the separator 4 is divided into 2 paths, and one path of the dry tail gas enters the circulating fan 5 for pressurization and then enters the hot blast stove 1 to be recycled as secondary mixed temperature air; the other path enters a draught fan 6 for pressurization and then is discharged.

The principle and the implementation mode of the invention are explained by applying specific examples, and the description of the above examples is only used for helping understanding the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.