Nanometer molecular sieve synthesis system for aromatic hydrocarbon production

Abstract

The utility model discloses a nano molecular sieve synthesis system for aromatic hydrocarbon production, which comprises a reaction kettle, a stirring mechanism and a motor coaxially connected with the stirring mechanism, the control system comprises a control panel which is in communication connection with the motor; a first control branch is arranged between the output end of the control panel and the input end of the motor and used for adjusting the rotating speed of the motor. A second control branch is arranged between the input end of the control panel and the output end of the motor and used for feeding back the rotating speed of the motor to the control panel. According to the technical scheme, when the stirring rotating speed of the reaction kettle is abnormal, the abnormal current condition of the motor can be fed back to the control panel in time, and the control panel adjusts the rotating speed in real time, so that the phenomenon that the stirring speed is abnormal after the viscosity of materials in the reaction kettle is greatly changed is fundamentally avoided. And an equipment stirring system is easy to overload, so that a stirring circuit system crashes, and stirring stops.

Description

TECHNICAL FIELD

[0001] The utility model relates to nanometer molecular sieve technical field, concretely relates to a nanometer molecular sieve synthesis system for aromatic production. BACKGROUND

[0002] Molecular sieve nanocrystallization is an important direction in the field of molecular sieve synthesis and application, and has higher catalytic activity, is favorable to the diffusion of reactant and product molecules, and delays coking deactivation.

[0003] Industrial production of nanometer molecular sieve has the following technical problems: the viscosity of raw materials in the reaction kettle changes greatly during the synthesis process, and in some cases, viscosity surge occurs, resulting in large stirring torque of the reaction kettle, system collapse and stirring stop. Because the crystallization synthesis reaction of nanometer molecular sieve is violent, a large amount of reaction heat is generated, which directly leads to synthesis failure.

[0004] In addition, in order to closely monitor the morphology, crystal type and other indicators during the synthesis of molecular sieve, the following method is generally adopted: a sampling pipeline is inserted into the inside of the top of the reaction kettle, a valve on the pipeline is manually opened, the molecular sieve slurry in the reaction kettle is pressed out by using the pressure difference between the inside and outside of the reaction kettle, the valve is closed after sampling, and the pipeline is flushed with pure water. This method mainly has the following problems: 1) the sampling personnel contact chemicals with a high probability, which is not conducive to the health of personnel; 2) the analysis result feedback is lagged, which is not conducive to quality control. UTILITY MODEL CONTENT

[0005] One of the technical problems solved by the utility model is how to accurately control the rotating speed of the stirring system of the reaction kettle to avoid system overload and stop running.

[0006] In order to achieve the above purpose, the utility model provides a nanometer molecular sieve synthesis system for aromatic production, which comprises:

[0007] The reaction kettle comprises a stirring mechanism and a motor coaxially connected with the stirring mechanism; and

[0008] The control system comprises a control panel in communication connection with the motor;

[0009] The output end of the control panel and the input end of the motor are provided with a first control branch for adjusting the rotating speed of the motor; the input end of the control panel and the output end of the motor are provided with a second control branch for feeding back the rotating speed of the motor to the control panel.

[0010] In some embodiments, a frequency converter is arranged on the first control branch to output frequency-adjustable alternating current to the motor.

[0011] In some embodiments, a current meter is arranged on the second control branch to monitor the current signal generated by the motor in real time and deliver the current signal to the control panel.

[0012] In some embodiments, a signal converter is arranged between the current meter and the control panel to convert the current signal generated by the motor into a digital signal.

[0013] In some embodiments, a sampling system arranged on the outer wall of the reaction kettle is further included.

[0014] In some embodiments, the sampling system comprises a sampling tube, a connecting tube connected between the reaction kettle and the sampling tube, and an exhaust tube arranged on the outer wall of the sampling tube.

[0015] In some embodiments, a movable piston assembly is arranged in the sampling tube, and the piston assembly comprises a piston and a push rod extending in an axial direction.

[0016] In some embodiments, a sampling port is arranged on the outer wall of one end of the sampling tube close to the connecting tube.

[0017] In some embodiments, control valves 16 are arranged on the connecting tube and the exhaust tube.

[0018] In some embodiments, in the height direction of the reaction kettle, the sampling system is arranged in the middle part of the reaction kettle.

[0019] Through the above technical solution, the first control branch that can adjust the rotating speed of the motor in real time is arranged between the output end of the control panel and the input end of the motor, and the second control branch that feeds back the rotating speed of the motor to the control panel is arranged between the input end of the control panel and the output end of the motor, so that when the rotating speed of the reaction kettle stirring appears abnormal, the current abnormality of the motor can be fed back to the control panel in time, and the control panel can adjust the rotating speed in real time, thereby fundamentally avoiding the problems of the overloading of the stirring system of the equipment, the collapse of the stirring circuit system and the stop of stirring caused by the large change of the viscosity of the material in the reaction kettle. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the overall structure schematic diagram of the nanometer molecular sieve synthesis system for producing aromatic hydrocarbons disclosed by the utility model;

[0021] Figure 2 is the crystallization time-material viscosity diagram of the synthesis process of the nanometer molecular sieve synthesis system for producing aromatic hydrocarbons disclosed by the utility model.

[0022] MARKS

[0023] 1, reaction kettle; 2, stirring mechanism; 3, control system; 4, motor; 5, frequency converter; 6, control panel; 7, ammeter; 8, signal converter; 9, sampling system; 10, exhaust pipe; 11, sampling pipe; 12, sampling port; 13, piston; 14, push rod; 15, connecting pipe; 16, control valve. DETAILED DESCRIPTION

[0024] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0025] To solve the problem that the existing technology cannot accurately control the rotating speed of the stirring system of the reaction kettle, resulting in system overload and stop running, the present application provides a nanometer molecular sieve synthesis system for aromatic production, comprising:

[0026] The reaction kettle 1 comprises a stirring mechanism 2 and a motor 4 coaxially connected with the stirring mechanism 2; and

[0027] The control system 3 comprises a control panel 6 in communication connection with the motor 4;

[0028] The output end of the control panel 6 and the input end of the motor 4 are provided with a first control branch for adjusting the rotating speed of the motor 4; and the input end of the control panel 6 and the output end of the motor 4 are provided with a second control branch for feeding back the rotating speed of the motor 4 to the control panel 6.

[0029] As shown in Figure 1 The control system 3 is in communication connection with the motor 4 of the reaction kettle 1 to control and adjust the rotating speed of the stirring mechanism 2, and the control system 3 is set as a remote control motor 4. Specifically, the first control branch is provided between the output end of the control panel 6 and the input end of the motor 4, and the second control branch is provided between the input end of the control panel 6 and the output end of the motor 4, and the first control branch and the second control branch can jointly constitute a control loop of the control system 3. The control panel 6 can be a central control computer.

[0030] As shown in Figure 2 The crystallization time-material viscosity diagram of the synthesis process of the nanometer molecular sieve synthesis system for aromatic production can be divided into four stages according to the change of the material viscosity: the first stage is 0-2 hours, the rotating speed of the motor 4 is set to 100r / min; the second stage is 2-20 hours, the rotating speed of the motor 4 is set to 80r / min; the third stage is 21-22 hours, the rotating speed of the motor 4 is set to 20r / min; and the fourth stage is 23-40 hours, the rotating speed of the motor 4 is set to 30r / min.

[0031] The working principle of the nanometer molecular sieve synthesis system for aromatic production is that the control system 3 pre-sets the warning value of the circuit current in the motor 4 and the safety value of the rotating speed of the motor 4, then adjusts the rotating speed of the motor 4 to the corresponding rotating speed value of the motor 4 in different stages through the first control branch, after the nanometer molecular sieve synthesis reaction starts, the viscosity of the material will rapidly increase, which causes the torque borne by the stirring mechanism 2 to rapidly increase, and the circuit current in the motor 4 driving the stirring mechanism 2 to rotate rapidly increases, in this process, the control panel 6 will feed back the circuit current value in the motor 4 to the control panel 6 in real time through the second control branch, when the control panel 6 detects that the current value fed back from the second control branch exceeds the warning value pre-set by the control panel 6, immediately adjusts the rotating speed of the motor 4 to the safety value through the first control branch and alarms. In this way, the situation that the circuit of the motor 4 is suddenly overloaded and breaks down, the motor 4 stops rotating, and the nanometer molecular sieve synthesis system for aromatic production collapses is effectively avoided. The pre-set rotating speed safety value of the motor 4 of the control panel 6 is preferably 5 r / min.

[0032] Through the above technical solution, the first control branch that can adjust the rotating speed of the motor 4 in real time is arranged between the output end of the control panel 6 and the input end of the motor 4, and the second control branch that feeds back the rotating speed of the motor 4 to the control panel 6 is arranged between the input end of the control panel 6 and the output end of the motor 4, so that when the stirring rotating speed of the reaction kettle is abnormal, the current abnormality of the motor 4 can be fed back to the control panel 6 in time, and the control panel 6 adjusts the rotating speed in real time, which fundamentally avoids the problem that the stirring mechanism 2 is easy to overload after the viscosity of the material in the reaction kettle 1 changes greatly, and the stirring circuit system collapses and stops stirring.

[0033] In some embodiments, a frequency converter 5 is arranged on the first control branch to output frequency-adjustable alternating current to the motor 4.

[0034] As shown in Figure 1 , the frequency converter 5 is arranged between the control panel 6 and the motor 4, for receiving the digital signal of the control panel 6 and converting it into an electric signal to adjust the rotating speed of the motor 4, and the control panel 6 can directly control the frequency converter 5 according to the pre-set program.

[0035] In some embodiments, an ammeter 7 is arranged on the second control branch to monitor and deliver the current signal generated by the motor 4 to the control panel 6 in real time.

[0036] As shown in Figure 1 , the ammeter 7 can be arranged between the motor 4 and the control panel 6, and the ammeter 7 can be a current monitoring meter for monitoring the circuit current in the motor 4, which specifically refers to the output current of the motor 4.

[0037] In some implementations, a signal converter 8 is provided between the ammeter 7 and the control panel 6 to convert the current signal generated by the motor 4 into a digital signal.

[0038] like Figure 1 As shown, the current output from motor 4 is an electrical signal, which needs to be further converted into a digital signal by signal converter 8 so that it can be received by control panel 6. Signal converter 8 can be set between ammeter 7 and control panel 6.

[0039] In some embodiments, a sampling system 9 is also included, which is disposed on the outer wall of the reactor 1.

[0040] like Figure 1 As shown, the sampling system 9 is used to sample the material in the reactor 1. It can communicate with the control system 3 to solve the problem that online real-time sampling is not possible during the synthesis of nano-molecular sieves, which leads to the inability to monitor the degree of purification of molecular sieves and the high risk of manual sampling.

[0041] In some embodiments, the sampling system 9 includes a sampling tube 11, a connecting pipe 15 connecting the reactor 1 and the sampling tube 11, and an exhaust pipe 10 disposed on the outer wall of the sampling tube 11.

[0042] like Figure 1 As shown, the sampling tube 11 is a horizontally extending long tube connected to the outer wall of the reactor 1 via a connecting pipe 15. The diameter of the connecting pipe 15 is smaller than the diameter of the sampling tube 11, and the length of the connecting pipe 15 is greater than the length of the sampling tube 11. This ensures that the material enters the sampling tube 11 continuously and uniformly, preventing the material from rushing into the sampling tube 11 and damaging it, thus affecting sampling. The exhaust pipe 1 is used to discharge the gas inside the sampling tube 11 before sampling and can be located near the end of the connecting pipe 15.

[0043] In some embodiments, a movable piston assembly is provided inside the sampling tube 11, the piston assembly including a piston 13 and a push rod 14 extending in the axial direction.

[0044] like Figure 1 As shown, push rod 14 is disposed on the side of piston 13 away from connecting rod 15. The movement of piston assembly can be achieved by manually pushing push rod 14, or by controlling push rod 14 to move via control system 3. Push rod 14 can be a hydraulic push rod.

[0045] In some embodiments, a sampling port 12 is provided on the outer wall of the sampling tube 11 near the connecting tube 15.

[0046] like Figure 1As shown, the sampling port 12 can be a visual flange window, with an electron microscope built-in, which starts to take electron microscope photos when the material enters the sampling tube 15, to observe the material state in the reactor 1 and monitor the purification degree of the material in real time.

[0047] In some embodiments, control valves 16 are arranged on the connecting tube 15 and the exhaust tube 10. Figure 1 As shown, the control valve 16 on the connecting tube 15 is an inlet valve, which is used to control the opening and closing of the connecting tube 15. The control valve 16 on the exhaust tube 10 is an exhaust valve, which is used to exhaust the gas in the sampling tube 11, to form a negative pressure or vacuum environment.

[0048] In some embodiments, in the height direction of the reactor 1, the sampling system 9 is arranged in the middle part of the reactor 1.

[0049] As shown, since the upper and lower parts of the reactor 1 are mostly unreacted material, the reaction products are mostly concentrated in the middle part, so the sampling system 9 is preferably arranged at the middle position of the material height in the reactor 1, which can make the sampling more representative. Figure 1

[0050] The working principle of the sampling system 9 is as follows: the stirring of the reactor 1 is closed, the control valve 16 of the exhaust tube 10 is opened, and the piston assembly is operated to the side of the sampling tube 11 away from the connecting tube 15, then the control valve 16 of the exhaust tube 10 is closed, the control valve 16 of the connecting tube 15 is opened, the nanometer molecular sieve slurry enters the sampling tube 11, the electron microscope takes electron microscope photos through the visual flange window, after the photos are taken, the piston assembly is pushed to the side of the sampling tube 11 close to the connecting tube 15, the nanometer molecular sieve slurry is pushed back to the reactor 1, and the control valve 16 of the connecting tube 15 is closed. The above process can be remotely controlled by the push rod control system 3.

[0051] The preferred embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited thereto. Within the technical concept of the present application, the technical solution of the present application can be variously modified, including various specific technical features combined in any suitable manner. In order to avoid unnecessary repetition, the present application will not be described again for various possible combination manners. However, these simple modifications and combinations should also be considered as disclosed contents of the present application, and all belong to the protection scope of the present application.​

Claims

1. A nanoscale molecular sieve synthesis system for aromatic hydrocarbon production, characterized by, The utility model relates to a kind of reaction kettle and control system, including: Reaction kettle (1), including stirring mechanism (2) and motor (4) coaxially connected with the stirring mechanism (2); And Control system (3), including control panel (6) being connected with the motor (4) communication; Wherein, the output of the control panel (6) is provided with first control branch between the input of the motor (4), for adjusting the rotating speed of the motor (4);The input of the control panel (6) is provided with second control branch between the output of the motor (4), for the rotating speed of the motor (4) to the control panel (6) feedback.

2. The nanoscale molecular sieve synthesis system for aromatic production of claim 1, wherein, Variable frequency device (5) is arranged on the first control branch to output adjustable frequency AC to the motor (4).

3. The nanoscale molecular sieve synthesis system for aromatic production of claim 1, wherein, Current meter (7) is arranged on the second control branch to monitor and deliver current signal generated by the motor (4) to the control panel (6) in real time.

4. The nanoscale molecular sieve synthesis system for aromatic production of claim 3, wherein, Signal converter (8) is arranged between the current meter (7) and the control panel (6) to convert the current signal generated by the motor (4) into digital signal.

5. The nanoscale molecular sieve synthesis system for aromatic production of claim 1, wherein, It also includes sampling system (9) arranged on the outer wall of the reaction kettle (1).

6. The nanoscale molecular sieve synthesis system for aromatic production of claim 5, wherein, The sampling system (9) includes sampling pipe (11), connecting pipe (15) connected between the reaction kettle (1) and the sampling pipe (11), exhaust pipe (10) arranged on the outer wall of the sampling pipe (11).

7. The nanoscale molecular sieve synthesis system for aromatic production of claim 6, wherein, Movable piston assembly is arranged in the sampling pipe (11), and the piston assembly includes piston (13) and push rod (14) extending in axial direction.

8. The nanoscale molecular sieve synthesis system for aromatic production of claim 6, wherein, Sampling port (12) is arranged on the outer wall of one end of the sampling pipe (11) close to the connecting pipe (15).

9. The nanoscale molecular sieve synthesis system for aromatic production of claim 6, wherein, Control valve (16) is arranged on the connecting pipe (15) and the exhaust pipe (10).

10. The nanoscale molecular sieve synthesis system for aromatic production of claim 5, wherein, In the height direction of the reaction kettle (1), the sampling system (9) is arranged in the middle of the reaction kettle (1).

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