CN212833629U

CN212833629U - Hydrogenation preheating system

Info

Publication number: CN212833629U
Application number: CN202021770550.9U
Authority: CN
Inventors: 刘哲; 邓宏达; 王鑫; 吕云飞; 昝大鑫
Original assignee: Zhangjiagang Free Trade Zone Huixin Chemical Technology Co ltd
Current assignee: Zhangjiagang Free Trade Zone Huixin Chemical Technology Co ltd
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2021-03-30
Anticipated expiration: 2030-08-21

Abstract

The application discloses hydrogenation preheating system relates to suspension bed hydrogenation technical field. The hydrogenation preheating system described herein comprises: a first heat exchanger; a feed pipe; a first hydrogenation pipe; a reaction discharge pipe; a first heating furnace; and the temperature controller receives a temperature signal from the thermometer and controls the opening of the control valve II through the temperature signal. This application is through setting up reasonable heat transfer network and temperature control system, control feeding temperature that can be accurate and increase the operation elasticity, reduces the possibility of coking in pipeline and the boiler tube, makes subsequent hydrocracking reaction more steady smooth-going, has solved the unstable problem of feeding temperature of hydrogenation reaction system among the prior art, provides the assurance for the long period operation of system, more can adapt to the market demand.

Description

Hydrogenation preheating system

Technical Field

The application relates to the technical field of suspension bed hydrogenation, in particular to a hydrogenation preheating system.

Background

The suspension bed hydrocracking technology is a heavy oil hydrocracking process, and can convert petroleum residue and coarse coal into fuel oil which can be sold on the market, such as gasoline, diesel oil and the like. The suspension bed reactor adopts slurry feeding, namely oil-solid mixed feeding. The oil phase is heavy oil to be processed, such as vacuum residuum, coal tar, catalytic slurry oil, asphalt and the like, and the solid phase is added catalyst, additive or coal powder. When the oil-solid mixture is fed, it is preheated to a predetermined reaction temperature together with hydrogen. In the prior art, if the temperature of the feeding material of the hydrogenation reactor and the control scheme thereof are unstable, the hydrocracking reaction in the hydrogenation reactor can not be smoothly carried out, or temperature runaway can occur, or serious coking can occur, which can cause production interruption and even damage to the reactor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a hydrogenation preheating system solves the unstable problem of feed temperature among the prior art among the hydrogenation reaction system, avoids taking place to fly mild coking phenomenon, guarantees that the hydrocracking reaction goes on smoothly.

In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions: a hydropreheating system, comprising: the first heat exchanger is a shell-and-tube heat exchanger, and is provided with a tube side and a shell side; the feed pipe is used for conveying the premixed oil-solid slurry, and the tail end of the feed pipe is connected with a shell side inlet of the first heat exchanger; the first hydrogenation pipe is used for conveying hydrogen from a new hydrogen machine, and is communicated with the feeding pipe, so that the hydrogen and the oil-solid slurry are mixed before entering the first heat exchanger to generate a hydrogenation mixture; the reaction discharging pipe is used for conveying reaction discharging materials from the suspension bed reaction system, and the tail end of the reaction discharging pipe is connected with the shell side inlet of the first heat exchanger; the first heating furnace is connected with a shell pass outlet of the first heat exchanger through a second pipeline, and the first heating furnace comprises: the first gas pipe is arranged at the bottom of the first heating furnace and is provided with a second control valve; the third pipeline is arranged at the lower end of one side of the first heating furnace and communicated with the fourth pipeline, the fourth pipeline is a feeding channel of the suspension bed reaction system, and thermometers are respectively arranged on the third pipeline and the fourth pipeline; and the temperature controller receives a temperature signal from the thermometer and controls the opening of the control valve II through the temperature signal.

In the technical scheme, the reasonable heat exchange network and the temperature control system are arranged, so that the feeding temperature can be accurately controlled, the operation flexibility is increased, the possibility of coking in pipelines and furnace tubes is reduced, the subsequent hydrocracking reaction is more stable and smooth, the problem of unstable feeding temperature of a hydrogenation reaction system in the prior art is solved, the guarantee is provided for the long-period operation of the system, and the market demand can be more met.

Further, according to the embodiment of the application, a spiral baffle is arranged in the first heat exchanger.

Further, according to the embodiment of the application, a first flow meter and a first control valve are arranged on the first hydrogenation pipe, and the first flow meter is communicated with the first control valve.

Further, according to the embodiment of the present application, wherein, the hydrogenation preheating system further includes: the second heat exchanger is connected with a tube pass outlet of the first heat exchanger through a first pipeline; and the second gas adding pipe is used for conveying residual hydrogen generated by the new hydrogen machine, and the tail end of the second gas adding pipe is connected with the second heat exchanger.

Further, according to the embodiment of the application, a second flow meter and a third control valve are arranged on the second hydrogenation pipe, and the second flow meter is communicated with the third control valve.

Further, according to the embodiment of the application, the second heat exchanger is communicated with the second pipeline through a sixth pipeline.

Further, according to the embodiment of the application, a fifth pipeline is arranged on the second hydrogenation pipe, the tail end of the fifth pipeline is connected with a sixth pipeline, a fourth control valve is arranged on the fifth pipeline, and the fourth control valve is communicated with the temperature controller.

Further, according to the embodiment of the application, the hydrogenation preheating system further comprises a second heating furnace, and the second heating furnace is communicated with the second heat exchanger through a sixth pipeline.

Further, according to the embodiment of the present application, the second heating furnace includes: the second gas pipe is arranged at the bottom of the second heating furnace and is provided with a fifth control valve; the seventh pipeline is arranged at the lower end of one side of the second heating furnace, the tail end of the seventh pipeline is connected with the fourth pipeline, a third thermometer is arranged on the seventh pipeline, and the third thermometer is communicated with the fifth control valve.

Compared with the prior art, the method has the following beneficial effects: this application is through setting up reasonable heat transfer network and temperature control system, control feeding temperature that can be accurate and increase the operation elasticity, reduces the possibility of coking in pipeline and the boiler tube, makes subsequent hydrocracking reaction more steady smooth-going, has solved the unstable problem of feeding temperature of hydrogenation reaction system among the prior art, provides the assurance for the long period operation of system, more can adapt to the market demand.

Drawings

The present application is further described below with reference to the drawings and examples.

FIG. 1 is a schematic structural diagram of a preheating system for hydrogenation in the first embodiment of the present application.

FIG. 2 is a schematic diagram of a preheating system for hydrogenation in the second embodiment of the present application.

In the attached drawings

1. Heat exchanger I2, hydrogenation pipe I3, inlet pipe

4. A reaction discharge pipe 5, a first pipeline 6 and a second pipeline

7. Heating furnace I8, gas pipe I9 and pipeline III

10. A fourth pipeline 11, a second heat exchanger 12 and a second hydrogenation pipe

13. Pipeline five 14, pipeline six 15 and heating furnace two

16. Gas pipe two 17, pipeline seven

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the invention and are not limiting of the invention, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.

Example one

Fig. 1 is a schematic structural diagram of a preheating system for hydrogenation in a first embodiment of the present application. As shown in fig. 1, the hydrogenation preheating system according to this embodiment includes a first heat exchanger 1, a first hydrogenation pipe 2, a feeding pipe 3, and a reaction discharging pipe 4. Wherein, the heat exchanger I1 is a vertical shell-and-tube heat exchanger and is provided with a tube side and a shell side. The first hydrogenation pipe 2 is used for conveying hydrogen from a new hydrogen machine, the first feeding pipe 3 is used for conveying pre-mixed oil-solid slurry, and the first hydrogenation pipe 2 is communicated with the middle part of the feeding pipe 3, so that the oil-solid slurry and the hydrogen are pre-mixed before heating. The hydrogen flow in the hydrogenation pipe I2 is matched with the slurry flow in the feeding pipe 3, so that heavy components in slurry feeding at high temperature are prevented from coking. The end of the feeding pipe 3 is connected with the shell side inlet of the heat exchanger I1, so that the hydrogenation mixture flows in the shell side of the heat exchanger I1, and solid particles in the hydrogenation mixture are prevented from depositing in the heat exchanger I1. The reaction discharging pipe 4 is used for conveying reaction discharging materials from the suspension bed reaction system, and the tail end of the reaction discharging pipe 4 is connected with the tube side inlet of the heat exchanger I1. As the hydrogenation reaction in the suspension bed reaction system is an exothermic reaction, the reaction discharge has a large amount of heat energy, and the hydrogenation mixture and the reaction discharge exchange heat in the heat exchanger I1 to recover the reaction heat.

Specifically, a spiral baffle is arranged in the heat exchanger I1, and the hydrogenation mixture flows along the spiral baffle after entering the shell side of the heat exchanger I1, so that the heat exchange efficiency of the hydrogenation mixture and the reaction discharge material is improved.

Specifically, the first hydrogenation pipe 2 is provided with a first flow meter and a first control valve, and the first flow meter and the first control valve are used for controlling the hydrogen flow in the first hydrogenation pipe 2 so as to match the hydrogen flow with the flow of the oil-solid slurry according to a proper proportion.

Secondly, the hydrogenation preheating system also comprises a first heating furnace 7, one side of the first heating furnace 7 is connected with a shell pass outlet of the first heat exchanger 1 through a second pipeline 6, and the hydrogenation mixture subjected to heat exchange is conveyed into the first heating furnace 7 for heating. The bottom of the heating furnace 7 is provided with a first gas pipe 8 used for conveying gas into the heating furnace 7. The lower end of the other side of the first heating furnace 7 is provided with a third pipeline 9, the third pipeline 9 is communicated with a fourth pipeline 10, the fourth pipeline 10 is a feeding channel of the suspension bed reaction system, and the hydrogenation mixture heated by the first heating furnace 7 is conveyed into the suspension bed reaction system through the third pipeline 9 and the fourth pipeline 10 for reaction.

Wherein, the first heating furnace 7 can adopt a design of multiple channels or even multiple heating furnaces connected in parallel according to the actual feeding amount, and in this embodiment, only a single-channel heating furnace is taken as an illustration. However, if a multi-channel heating furnace is adopted, the flow of hydrogen distributed in each channel must be ensured to be equal, otherwise hot spots appear in the furnace tube or coking occurs on the tube wall.

And thermometers are respectively arranged on the third pipeline 9 and the fourth pipeline 10 and are used for detecting the temperatures of the discharge port of the first heating furnace 7 and the feed port of the suspension bed reaction system in real time. The thermometer is communicated with the temperature controller and transmits the temperature signals of the two positions to the temperature controller. And a second control valve is arranged on the first gas pipe 8, and the opening of the second control valve is controlled by the temperature controller through logical operation so as to adjust the feeding temperature of the suspension bed reaction system.

To this, this application is through setting up reasonable heat transfer network and temperature control system, control feeding temperature that can be accurate and increase the operation elasticity, reduces the possibility of coking in pipeline and the boiler tube, makes subsequent hydrocracking reaction more steady smooth-going, has solved the unstable problem of feeding temperature of hydrogenation reaction system among the prior art, provides the assurance for the long period operation of system, more can adapt to the market demand.

Secondly, the hydrogenation preheating system also comprises a second heat exchanger 11, the second heat exchanger 11 is connected with a tube pass outlet of the first heat exchanger 1 through a first pipeline 5, and reaction discharge subjected to primary heat exchange is conveyed to the second heat exchanger 11 for secondary heat exchange. And a second hydrogenation pipe 12 is arranged at the other inlet of the second heat exchanger 11, and the second hydrogenation pipe 12 is used for conveying the residual hydrogen generated by the new hydrogen machine, so that the residual hydrogen and the reaction discharge material exchange heat in the second heat exchanger 11, and further the reaction heat is recovered.

Wherein, the second hydrogenation pipe 12 is provided with a second flow meter and a third control valve for controlling the hydrogen flow in the second hydrogenation pipe 12.

The second heat exchanger 11 is communicated with the second pipeline 6 through a sixth pipeline 14, and the residual hydrogen after heat exchange is conveyed into the second pipeline 6, so that the residual hydrogen and the hydrogenation mixture are mixed before the first heating furnace 7 and then are conveyed into the first heating furnace 7 for heating.

Wherein, the second hydrogenation pipe 12 is provided with a fifth pipeline 13, and the tail end of the fifth pipeline 13 is connected with the middle part of the sixth pipeline 14. And a control valve IV is arranged on the pipeline V13 and is communicated with a temperature controller, and the oil temperature controller controls the opening degree of the control valve IV so as to adjust the temperature of the residual hydrogen in the pipeline VI 14 and further adjust the feeding temperature of the suspension bed reaction system.

Example two.

FIG. 2 shows a preheating system for hydrogenation in the second embodiment of the present application. As shown in fig. 2, the hydrogenation preheating system of the embodiment is different in that the hydrogenation preheating system further includes a second heating furnace 15, the end of the sixth pipeline 14 is connected to one side of the second heating furnace 15, and the residual hydrogen after heat exchange is conveyed into the second heating furnace 15 for final preheating. And a second gas pipe 16 is arranged at the bottom of the second heating furnace 15 and used for conveying gas into the second heating furnace 15. The lower end of the other side of the second heating furnace 15 is provided with a seventh pipeline 17, the tail end of the seventh pipeline 17 is connected with the fourth pipeline 10, and the residual hydrogen heated by the second heating furnace 15 is conveyed into the fourth pipeline 10 to be mixed with the hydrogenation mixture before entering the suspension bed reaction system.

In this regard, the second heating furnace 15 can reduce the heat load and the manufacturing cost of the first heating furnace 7, and can make the outlet temperature of the first heating furnace 7 lower, which not only increases the operation flexibility, but also reduces the possibility of coking in the first heating furnace 7.

The seventh pipeline 17 is provided with a third thermometer, the second gas pipe 16 is provided with a fifth control valve, the third thermometer is communicated with the fifth control valve, and the opening of the fifth control valve is controlled by the temperature at the outlet of the second heating furnace 15, so that the temperature is adjusted.

Other devices and structures in the second embodiment are consistent with the second embodiment and have the same effects, and are not described herein again.

Although the illustrative embodiments of the present application have been described above to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the embodiments, and various modifications within the spirit and scope of the present application defined and determined by the appended claims will be apparent to those skilled in the art from this disclosure.

Claims

1. A hydropreheating system, comprising:

the heat exchanger I is a shell-and-tube heat exchanger, and is provided with a tube side and a shell side;

the feed pipe is used for conveying premixed oil-solid slurry, and the tail end of the feed pipe is connected with a shell side inlet of the first heat exchanger;

the first hydrogenation pipe is used for conveying hydrogen from a fresh hydrogen machine, and is communicated with the feeding pipe, so that the hydrogen and the oil-solid slurry are mixed before entering the first heat exchanger to generate a hydrogenation mixture;

the reaction discharging pipe is used for conveying reaction discharging materials from the suspension bed reaction system, and the tail end of the reaction discharging pipe is connected with the shell side inlet of the first heat exchanger;

the heating furnace I is connected with a shell pass outlet of the heat exchanger I through a pipeline II, and comprises:

the first gas pipe is arranged at the bottom of the first heating furnace and is provided with a second control valve;

the pipeline III is arranged at the lower end of one side of the heating furnace I and is communicated with the pipeline IV, the pipeline IV is a feeding channel of the suspension bed reaction system, and thermometers are respectively arranged on the pipeline III and the pipeline IV;

and the temperature controller is used for receiving a temperature signal from the thermometer and controlling the opening of the second control valve through the temperature signal.

2. The system of claim 1, wherein the first heat exchanger is internally provided with a spiral baffle.

3. The hydrogenation preheating system of claim 1, wherein a first flow meter and a first control valve are arranged on the first hydrogenation pipe, and the first flow meter is communicated with the first control valve.

4. The system of claim 1, further comprising:

the second heat exchanger is connected with a tube pass outlet of the first heat exchanger through a first pipeline;

and the second hydrogenation pipe is used for conveying the residual hydrogen generated by the new hydrogen machine, and the tail end of the second hydrogenation pipe is connected with the second heat exchanger.

5. The hydrogenation preheating system according to claim 4, wherein a second flow meter and a third control valve are arranged on the second hydrogenation pipe, and the second flow meter is communicated with the third control valve.

6. The hydrogenation preheating system of claim 4, wherein the second heat exchanger is in communication with the second pipeline through a sixth pipeline.

7. The hydrogenation preheating system according to claim 6, wherein a fifth pipeline is arranged on the second hydrogenation pipe, the tail end of the fifth pipeline is connected with the sixth pipeline, a fourth control valve is arranged on the fifth pipeline, and the fourth control valve is communicated with the temperature controller.

8. The hydrogenation preheating system of claim 4, further comprising a second heating furnace, wherein the second heating furnace is communicated with the second heat exchanger through a sixth pipeline.

9. The system of claim 8, wherein the second heating furnace comprises:

the second gas pipe is arranged at the bottom of the second heating furnace and is provided with a fifth control valve;

the seventh pipeline is arranged at the lower end of one side of the second heating furnace, the tail end of the seventh pipeline is connected with the fourth pipeline, a third thermometer is arranged on the seventh pipeline, and the third thermometer is communicated with the fifth control valve.

10. The hydrogenation preheating system according to claim 8, wherein a fifth pipeline is arranged on the second hydrogenation pipe, the tail end of the fifth pipeline is connected with the sixth pipeline, a fourth control valve is arranged on the fifth pipeline, and the fourth control valve is communicated with the temperature controller.