CN219024231U

CN219024231U - Disproportionation device reactor feeding system

Info

Publication number: CN219024231U
Application number: CN202320006444.0U
Authority: CN
Inventors: 张伟华; 宋克俊; 张东石; 季士良; 陈能坚; 姚健; 李庆
Original assignee: Hengli Petrochemical Dalian Refining Co Ltd
Current assignee: Hengli Petrochemical Dalian Refining Co Ltd
Priority date: 2023-01-03
Filing date: 2023-01-03
Publication date: 2023-05-16
Anticipated expiration: 2033-01-03

Abstract

The utility model belongs to the technical field of benzene production from aromatic hydrocarbon, and particularly relates to a disproportionation device reactor feeding system. The device further comprises a heat exchanger, a feed inlet I of the heat exchanger is connected with a discharge port of the filter, the discharge port I of the heat exchanger is connected in two paths, a first path is connected with the feed inlet of the reactor through a heating furnace, a second path is connected with the feed inlet of the reactor, a feed inlet II of the heat exchanger is connected with the discharge port of the reactor, a feed inlet II of the heat exchanger is connected with a hydrogen pipeline, and a discharge port II of the heat exchanger is connected with the feed inlet of the high-pressure tank. The reaction raw materials fully utilize the heat release of the reaction and the heat exchange of the reaction products, and then enter the reactor in two paths, so that the vibration influence of the reaction heating furnace tube is effectively solved, and the feeding load is improved.

Description

Disproportionation device reactor feeding system

Technical Field

The utility model belongs to the technical field of benzene production from aromatic hydrocarbon, and particularly relates to a disproportionation device reactor feeding system.

Background

The disproportionation reaction feed takes toluene, carbon nona-arene (C9A) and carbon deca-arene (C10A) as raw materials, and is mixed under the hydrogen condition and enters a reactor, and benzene and carbon octa-arene (C8A) are mainly generated under the action of a catalyst. The disproportionation device vibrates the reaction heating furnace tube along with the increase of the feeding amount of the reaction raw materials, and the bypass overline of the reaction heating furnace is increased, so that the vibration problem of the heating furnace tube can be effectively relieved. The hydrogenation side reaction of the aromatic hydrocarbon with carbon nine and above in the raw material of the disproportionation device releases a great amount of reaction heat, and after the heat exchange of the reaction raw material and the reaction product, the reaction temperature can reach the reaction required temperature, thereby meeting the reaction condition.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a feeding system of a disproportionation device reactor, which is provided with a bypass overline of a heating furnace.

In order to achieve the above object, the technical scheme of the present utility model is as follows:

the utility model provides a disproportionation device reactor feed system, disproportionation device includes filter, heating furnace, reactor, hot high score tank, air cooler, cold high score tank, compressor and stripper, the device still includes the heat exchanger, the feed inlet I of heat exchanger links to each other with the discharge gate of filter, the discharge gate I of heat exchanger divides two ways to be connected, and first way links to each other with the feed inlet of reactor through the heating furnace, and the second way links to each other with the feed inlet of reactor, the feed inlet II of heat exchanger links to each other with the discharge gate of reactor, the feed inlet II of heat exchanger links to each other with the hydrogen pipeline, the discharge gate II of heat exchanger links to each other with the feed inlet of hot high score tank.

In the above technical scheme, further, the second pipeline is provided with an isolation valve I, a regulating valve and an isolation valve II along the flow direction of the raw materials.

In the above technical scheme, further, a shower guide valve is arranged between the isolation valve I and the regulating valve on the second pipeline.

In the above technical scheme, further, a vent valve is arranged between the isolation valve II and the regulating valve on the second pipeline.

In the above technical scheme, further, the bottom discharge port of the hot high-pressure tank is connected with the feed inlet of the stripping tower, and the top discharge port is connected with the air cooler and the cold high-pressure tank in sequence.

In the above technical scheme, further, the bottom discharge port of the cold high-pressure separator tank is connected with the feed port of the stripping tower, and the top discharge port is connected with the hydrogen pipeline through the compressor.

The beneficial effects of the utility model are as follows:

1. the reaction raw materials fully utilize the heat release of the reaction and the heat exchange of the reaction products, and then enter the reactor in two paths, so that the vibration influence of the reaction heating furnace tube is effectively solved, and the feeding load is improved.

2. The utility model can improve the yield of target products and greatly reduce the comprehensive energy consumption.

Drawings

FIG. 1 is a schematic diagram of a feed system for a disproportionation unit reactor in accordance with the present utility model;

in the figure: 1. the device comprises a filter, 2, a heat exchanger, 3, a heating furnace, 4, a reactor, 5, a hot high-pressure tank, 6, an air cooler, 7, a cold high-pressure tank, 8, a stripping tower, 9, a compressor, 10, an isolation valve I, 11, an isolation valve II, 12, a regulating valve, 13, a shower guiding valve, 14 and an emptying valve.

Detailed Description

The following examples will enable those of ordinary skill in the art to more fully understand the utility model and are not intended to limit the utility model in any way.

A disproportionation device reactor feeding system is shown in figure 1, and the disproportionation device comprises a filter 1, a heating furnace 3, a reactor 4, a heat high-pressure tank 5, an air cooler 6, a cold high-pressure tank 7, a compressor 9, a stripping tower 8 and a heat exchanger 2, wherein a feeding port I of the heat exchanger 2 is connected with a discharging port of the filter 1, a discharging port I of the heat exchanger 2 is connected in two ways, a first way is connected with the feeding port of the reactor through the heating furnace 3, a second way is connected with the feeding port of the reactor 4, a feeding port II of the heat exchanger 2 is connected with the discharging port of the reactor 4, a feeding port II of the heat exchanger 2 is connected with a hydrogen pipeline, and a discharging port II of the heat exchanger 2 is connected with the feeding port of the heat high-pressure tank 5. The second pipeline is provided with an isolation valve I10, a regulating valve 12 and an isolation valve II 11 along the flow direction of raw materials in sequence, a shower guide valve 13 is arranged between the isolation valve I10 and the regulating valve 12, and an emptying valve 14 is arranged between the isolation valve II 11 and the regulating valve 12. The bottom discharge port of the hot high-pressure separator tank 5 is connected with the feed port of the stripping tower 8, and the top discharge port is connected with the air cooler 6 and the cold high-pressure separator tank 7 in sequence. The bottom discharge port of the cold high-pressure separator 7 is connected with the feed port of the stripping tower 8, and the top discharge port is connected with a hydrogen pipeline through a compressor 9.

Example 1

The petrochemical arene united device is equipped with a 3.3Mt/a disproportionation device, and adopts HLD-001 catalyst developed by Shanghai petrochemical institute of China petrochemical industry, inc., and complete set of hydrogenation/fixed bed toluene disproportionation and alkyl transfer process technology. The disproportionation reaction feed takes toluene, carbon nona-arene (C9A) and carbon deca-arene (C10A) as raw materials, and is mixed under the hydrogen condition and enters a reactor, and benzene and carbon octa-arene (C8A) are mainly generated under the action of a catalyst. The reaction product and the reaction raw material enter a stripping tower after heat exchange through a winding pipe heat exchanger.

The leading-out position of the second pipeline should be as close to the outlet of the feeding and discharging heat exchanger as possible (far away from the pipeline access point after the liquid phase raw material bypasses the feeding and discharging heat exchanger), and meanwhile, the pipeline confluence point should be as close to the outlet of the heating furnace as possible, far away from the reactor, and a sufficient mixing distance is provided.

Changing an inlet pipeline of the heating furnace, changing a raw material feeding pipeline distributor from DN450 pipe diameter to DN600 pipe diameter, and changing a heating furnace pipeline from DN200 to DN250 pipe diameter; the pipeline distribution condition is divided into 2 strands by DN800 main pipes, and the two-in-one and the four-in-two of the heating furnace are introduced into the heating furnace, and the two sides of the heating furnace are introduced into the heating furnace from the two-in-one and the four-in-one of the heating furnace.

The total length of the heating furnace is 543.12m, the original furnace tube size is phi 193.7 x 8.18 (mm), the changed size is phi 219 x 8.18 (mm), the flow area is increased by 30% after the change through calculation, the flow speed is reduced by 23% under the same load of disproportionation reaction, and the vibration problem of the heating furnace is fundamentally reduced by increasing the flow area and reducing the feeding flow speed.

The vibration conditions of furnace tubes of the heating furnace after the reactor feeding system is used are shown in a table 1, and the productivity conditions are shown in a table 2.

Table 1 comparison of vibration conditions of furnace tubes before and after modification of heating furnace flow

Table 2 comparison of capacity before and after modification of heating furnace flow

After the disproportionation reaction feed load was increased, the catalyst and selectivity were compared as shown in table 3 below. The load increase after transformation has no influence on the conversion rate and the selectivity, the yield of C8A is increased by about 16.5t/h, and the annual yield of C8A is increased by about 14 ten thousand tons.

After the disproportionation reaction feed load was increased, the steam consumption of 3.6Mpa and the fuel gas consumption were compared as shown in table 3 below.

TABLE 3 comparison of throughput conditions before and after modification of heating furnace flows

In the prior art, when 104% is loaded, the hydrogen-hydrocarbon ratio is maintained to be more than 3.0, and after the load is increased, the rotating speed of a compressor is increased by about 180rpm/min, and the consumption of turbine steam is increased by about 1t/h; the heavy aromatic hydrocarbon tower part, the surplus C9A is sent to a finished product wharf, and after the current load is increased, C9A is subjected to disproportionation reaction, so that the fuel gas consumption of a heating furnace of the heavy aromatic hydrocarbon tower is basically unchanged from that of the heavy aromatic hydrocarbon tower after transformation; 3.6Mpa steam is consumed by the disproportionation stripping tower and the toluene tower, the purity of benzene products is not affected after the feeding load of the disproportionation reaction is improved, and reboiling of the solid stripping tower is unchanged; the toluene column steam consumption was suitably increased according to the feed load. As can be seen, the load was increased to 118% and the overall energy consumption of the disproportionation unit was reduced by 2.3kg EO/t using the reactor feed system of the present utility model.

The above examples are only preferred embodiments of the present utility model and are not limiting of the implementation. The protection scope of the present utility model shall be subject to the scope defined by the claims. Other variations or modifications may be made in the various forms based on the above description. Obvious variations or modifications of the embodiments are within the scope of the utility model.

Claims

1. The utility model provides a disproportionation device reactor feed system, disproportionation device includes filter, heating furnace, reactor, hot high-pressure tank, air cooler, cold high-pressure tank, compressor and stripper, its characterized in that, the device still includes the heat exchanger, the feed inlet I of heat exchanger links to each other with the discharge gate of filter, the discharge gate I of heat exchanger divides two ways to be connected, and first way links to each other with the feed inlet of reactor through the heating furnace, and the second way links to each other with the feed inlet of reactor, the feed inlet II of heat exchanger links to each other with the discharge gate of reactor, the feed inlet II of heat exchanger links to each other with the hydrogen pipeline, the discharge gate II of heat exchanger links to each other with the feed inlet of hot high-pressure tank.

2. The disproportionation apparatus reactor feeding system according to claim 1, wherein an isolation valve i, a regulating valve and an isolation valve ii are provided in this order in the direction of flow of the raw material on the second path.

3. The disproportionation apparatus reactor feeding system according to claim 1, wherein a shower guide valve is provided between the isolation valve i and the regulating valve on the second line.

4. The disproportionation apparatus reactor feeding system according to claim 1, wherein a vent valve is provided between the isolation valve ii and the regulating valve on the second line.

5. The disproportionation apparatus reactor feeding system according to claim 1, wherein the bottom discharge port of the hot high-pressure tank is connected to the feed port of the stripping column, and the top discharge port is connected to the air cooler and the cold high-pressure tank in this order.

6. The disproportionation plant reactor feed system according to claim 1, wherein the bottom discharge port of the cold high-pressure separator tank is connected to the feed port of the stripping column and the top discharge port is connected to the hydrogen line via a compressor.