Thermal high-pressure separator and direct coal liquefaction system

Abstract

The utility model discloses a thermal high-pressure separator and coal direct liquefaction system, the thermal high-pressure separator comprises a separator body and a controller connected with a liquid level control valve, the separator body comprises an upper sealing head, an upper transition section, a cylinder body, a lower transition section, a conical section and a lower connecting flange which are connected in sequence, a nuclear densimeter is arranged in the middle of the barrel, the controller is connected with the nuclear densimeter, and the controller controls the liquid level control valve according to the real-time density of the nuclear densimeter and a preset density threshold value. According to the thermal high-pressure separator, the nuclear density meter is arranged in the middle of the barrel of the separator body, the real-time density in the thermal high-pressure separator is detected in real time through the nuclear density meter, the real-time density is transmitted to the controller, and the controller controls the liquid level control valve according to the real-time density and the preset density threshold value, so that the liquid level is prevented from being too high or too low; and the liquid level of the thermal high-pressure separator is automatically controlled.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal liquefaction, especially relates to a hot high-pressure separator and coal direct liquefaction system. BACKGROUND

[0002] The hot high-pressure separator is a gas-liquid separation device operated under high-temperature high-pressure hydrogen-containing conditions. Its main function is to separate gas and liquid under high-temperature high-pressure environment, and the separated gas enters the cold high-pressure separator after heat exchange, realizing three-phase separation of oil, gas and water.

[0003] In the coal direct liquefaction process, the product after coal direct liquefaction reaction enters the hot high-pressure separator, and the gas phase enters the warm high-pressure separator and the cold high-pressure separator after step-by-step cooling. Therefore, the hot high-pressure separator plays a very important role in the coal direct liquefaction process. The detection and control of the liquid level of the hot high-pressure separator are extremely critical for coal direct liquefaction. If the liquid level is too high, it will increase the risk of coking of the hot high-pressure separator, and if the liquid level is too low, it will cause high-pressure gas to enter the low-pressure system, posing a great threat to the device.

[0004] The existing liquid level detection of the hot high-pressure separator applied to the direct liquefaction device mainly uses the "blowback hydrogen" blow-type level gauge. The blow-type level gauge is mostly used for liquid level measurement of solid-containing, dirty and corrosive media. The purpose of blowback hydrogen is essentially to prevent material backflow, blockage of pressure lead pipe or corrosion of transmitter diaphragm. The measurement principle of the blow-type level gauge is based on differential pressure measurement of liquid level, but the pressure taking method is different from that of the conventional differential pressure level gauge. Generally, two pressure lead pipes are inserted from the top of the container, the pressure lead pipe connected to the positive pressure of the instrument is inserted deeper, and the pressure lead pipe connected to the negative pressure of the instrument is inserted shallower. The key to accurate measurement of the blowback hydrogen level gauge is to adjust the flow of hydrogen on the positive and negative pressure sides. However, the blowback hydrogen pipeline is equipped with multiple valves, hydrogen flow meters, check valves and other accessories. If these accessories fail, it will affect the stability of the hydrogen flow, thereby affecting the accuracy of the measurement. Even when the blowback hydrogen supply is interrupted for a long time or the flow fluctuates greatly for a long time, it will cause material backflow to block the pressure lead pipe, resulting in failure of liquid level measurement, and ultimately leading to failure of the liquid level automatic control system. Therefore, the existing liquid level detection of the hot high-pressure separator uses the blow-type level gauge, which is prone to failure during the running period and cannot be repaired automatically, causing the single-loop closed control system to fail, and resulting in operation with disease or forced shutdown for maintenance due to failure of the liquid level control system. SUMMARY

[0005] The utility model aims at overcoming the deficiency that the liquid level gauge of the existing hot high-pressure separator is prone to failure and cannot be repaired automatically, resulting in operation with disease or forced shutdown for maintenance due to failure of the liquid level control system, and provides a hot high-pressure separator and coal direct liquefaction system.

[0006] The utility model discloses a technical scheme provides a high pressure separator, including separator body and with liquid level control valve connection's controller, the separator body includes the upper head of connection in proper order, upper transition section, cylinder, lower transition section, cone section and lower connection flange, the middle part of cylinder is equipped with nuclear density meter, the controller is connected with nuclear density meter, the controller according to the real -time density of nuclear density meter and preset density threshold controls liquid level control valve.

[0007] In one of the optional technical solutions, the middle part of the cylinder is provided with a mounting member for mounting the nuclear density meter.

[0008] In one of the optional technical solutions, the nuclear density meter includes a radioactive source and a receiver, the mounting member includes a fixing seat, a hanging rope and a hanging rope clamp, the fixing seat is arranged on the outer sidewall of the cylinder, the receiver is arranged on the fixing seat, the hanging rope clamp is clamped at the opening of the separator body, one end of the hanging rope is connected with the hanging rope clamp, the other end of the hanging rope is connected with the radioactive source, and the radioactive source is fixed inside the cylinder and located on the same horizontal plane as the receiver.

[0009] In one of the optional technical solutions, the cylinder is provided with a blind hole extending away from the receiver at the position of the receiver.

[0010] In one of the optional technical solutions, the fixing seat is fixedly connected with the outer sidewall of the cylinder.

[0011] In one of the optional technical solutions, the fixing seat is surfacing welded with the cylinder.

[0012] In one of the optional technical solutions, the outer sidewall of the cylinder is provided with a surfacing layer, and a transition section with a slope is arranged between the surfacing layer and the cylinder.

[0013] In one of the optional technical solutions, the slope is 1:3.

[0014] In one of the optional technical solutions, the fixing seat is arranged in the middle part of the cylinder.

[0015] The utility model discloses a technical scheme still provides a coal direct liquefaction system, including the high pressure separator as described above.

[0016] By adopting the technical scheme, the following beneficial effects are achieved: the nuclear density meter is arranged at the middle part of the barrel of the separator body, the real-time density in the thermal high-pressure separator is detected in real time through the nuclear density meter, the real-time density is transmitted to the controller, the controller controls the liquid level control valve according to the real-time density and the preset density threshold value, the liquid level is prevented from being too high or too low, and the liquid level of the thermal high-pressure separator is automatically controlled. The nuclear density meter has low failure rate, reduces the failure risk, avoids the thermal high-pressure separator from being operated with a fault or forced to stop for maintenance, and further improves safety. BRIEF DESCRIPTION OF DRAWINGS

[0017] The disclosure of the present application will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are only intended to illustrate the present application and are not intended to limit the scope of protection of the present application. In the drawings:

[0018] Figure 1 A structural schematic view of a thermal high-pressure separator provided by an embodiment of the present application is shown in FIG. 1.

[0019] Figure 2 A structural schematic view of a thermal high-pressure separator provided by an embodiment of the present application is shown in FIG. 1. Figure 1 An enlarged view of part A of FIG. 1. DETAILED DESCRIPTION

[0020] The specific embodiments of the present application will be further described below with reference to the accompanying drawings.

[0021] It is easy to understand that, according to the technical scheme of the present application, a person skilled in the art can replace various structural modes and implementation modes without changing the essential spirit of the present application. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical scheme of the present application, and should not be regarded as the whole or as a limitation or restriction on the technical scheme of the present application.

[0022] In this specification, the orientation terms such as up, down, left, right, front, back, front surface, back surface, top, bottom, etc. mentioned or possibly mentioned are defined with respect to the structure shown in the drawings, and they are relative concepts, so they can be changed accordingly according to different positions and different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0023] As shown in FIGS. 1 and 2, a thermal high-pressure separator provided by an embodiment of the present application includes a separator body 10 and a controller connected with a liquid level control valve, the separator body 10 includes an upper head 11, an upper transition section 12, a barrel 13, a lower transition section 14, a cone section 15 and a lower connection flange 16 connected in sequence, a nuclear density meter is arranged at the middle part of the barrel 13, the controller is connected with the nuclear density meter, and the controller controls the liquid level control valve according to the real-time density of the nuclear density meter and a preset density threshold value. Figure 1 and Figure 2 As shown in FIGS. 1 and 2, a thermal high-pressure separator provided by an embodiment of the present application includes a separator body 10 and a controller connected with a liquid level control valve, the separator body 10 includes an upper head 11, an upper transition section 12, a barrel 13, a lower transition section 14, a cone section 15 and a lower connection flange 16 connected in sequence, a nuclear density meter is arranged at the middle part of the barrel 13, the controller is connected with the nuclear density meter, and the controller controls the liquid level control valve according to the real-time density of the nuclear density meter and a preset density threshold value.

[0024] The hot high-pressure separator provided by the utility model is mainly applied to a coal direct liquefaction system, and the hot high-pressure separator provided by the utility model in an embodiment mainly comprises a separator body 10 and a controller.

[0025] The separator body 10 comprises an upper head 11, an upper transition section 12, a cylinder body 13, a lower transition section 14, a conical section 15 and a lower connecting flange 16 connected in sequence, and the connecting positions between the upper head 11, the upper transition section 12, the cylinder body 13, the lower transition section 14, the conical section 15 and the lower connecting flange 16 are arc transitioned, so that the structural strength is improved.

[0026] The middle part of the cylinder body 13 is provided with a nuclear density meter, the nuclear density meter is used for detecting the real-time density of the hot high-pressure separator and transmitting the real-time density to the controller, the controller controls the liquid level control valve according to the real-time density and a preset density threshold value, so that the liquid level of the hot high-pressure separator is controlled, for example, when the real-time density meets the preset density threshold value, the liquid level is kept within a certain range, so that the risk of coking of the hot high-pressure separator caused by too high liquid level is avoided, and the high-pressure gas is prevented from entering the low-pressure system, so that the device is threatened, and the liquid level is monitored in real time by detecting the density.

[0027] The liquid level control valve has automatic and manual modes, when the liquid level control valve is in the automatic mode, the controller controls the opening of the liquid level control valve to control the liquid level of the hot high-pressure separator, when the liquid level control valve is in the manual mode, the liquid level of the hot high-pressure separator is manually controlled, so that the liquid level of the hot high-pressure separator is controlled in the automatic mode or in an emergency, and the safety is improved.

[0028] The specific structure and working principle of the nuclear density meter belong to the prior art, and are not described here.

[0029] The preset density threshold value is 200kg / m 3 -650kg / m 3 , in order to improve the accuracy.

[0030] The shape of the upper head 11 is spherical.

[0031] The lower connecting flange 16 is a manhole flange.

[0032] The controller is a proportional-integral-differential (PID) controller.

[0033] The embodiment is characterized in that a nuclear density meter is arranged at the middle part of the barrel of the separator body, the real-time density in the high-temperature high-pressure separator is detected in real time through the nuclear density meter, the real-time density is transmitted to the controller, the controller controls the liquid level control valve according to the real-time density and the preset density threshold value, the liquid level is prevented from being too high or too low, and the liquid level of the high-temperature high-pressure separator is automatically controlled. The nuclear density meter has low failure rate, reduces the failure risk, avoids the high-temperature high-pressure separator from being operated with defects or forced to stop for maintenance, and further improves the safety.

[0034] In one of the embodiments, the middle part of the barrel 13 is provided with a mounting part for mounting the nuclear density meter.

[0035] The mounting part is used for mounting the nuclear density meter, and the connection stability of the nuclear density meter is improved through the mounting part.

[0036] In one of the embodiments, in order to facilitate the installation of the nuclear density meter, the nuclear density meter comprises a radiation source and a receiver, the mounting part comprises a fixing seat, a lifting rope and a lifting rope clamp, the fixing seat is arranged on the outer side wall of the barrel 13, the receiver is arranged on the fixing seat, the lifting rope clamp is clamped at the opening of the separator body 10, one end of the lifting rope is connected with the lifting rope clamp, the other end of the lifting rope is connected with the radiation source, the radiation source is fixed in the interior of the barrel 13, and the nuclear density meter is located on the same horizontal plane with the receiver.

[0037] In one of the embodiments, the lifting rope is a steel wire rope, and the lifting rope clamp is a steel wire rope clamp. The lifting rope clamp is clamped at the opening of the top of the separator body 10, and the lifting rope is fixedly connected with the lifting rope clamp.

[0038] In one of the embodiments, the barrel 13 is provided with a blind hole 132 extending away from the receiver at the position of the receiver. The wall thickness of the barrel 13 is thinned through the blind hole 132, so that the receiver can more easily receive the radiation signal of the radiation source, and the accuracy is further improved.

[0039] In one of the embodiments, in order to further improve the connection stability, the fixing seat is fixedly connected with the outer side wall of the barrel 13.

[0040] In one of the embodiments, in order to further improve the connection stability, the fixing seat is overlay-welded with the barrel 13.

[0041] In one of the embodiments, in order to further improve the connection stability, the outer side wall of the barrel 13 is provided with an overlay-welded layer 132, and a transition section 1321 with a slope is arranged between the overlay-welded layer 132 and the barrel 13.

[0042] In one of the embodiments, in order to further improve the connection stability, a stud 133 is arranged on the overlay-welded layer 133, the fixing seat comprises a bottom plate, a through hole corresponding to the stud 133 is arranged on the bottom plate, and the bottom plate is bolted with the barrel 13 through the stud 133 and the through hole.

[0043] In one of the embodiments, in order to further improve the connection stability, the slope is 1:3.

[0044] The technical scheme of the utility model further provides a coal direct liquefaction system, including the hot high pressure separator as described above.

[0045] The above is only the principle and preferred embodiment of the utility model. It should be pointed out that, for ordinary skilled person in the art, on the basis of the principle of the utility model, a number of other variants can also be made, which should also be regarded as the protection scope of the utility model.

Claims

1. A thermal high pressure separator, characterized in that, The separator body comprises an upper head, an upper transition section, a cylinder, a lower transition section, a cone section and a lower flange connected in sequence, a middle part of the cylinder is provided with a nuclear density meter, the controller is connected with the nuclear density meter, and the controller controls the liquid level control valve according to the real-time density of the nuclear density meter and a preset density threshold value.

2. The thermal high pressure separator of claim 1, wherein, The middle part of the cylinder is provided with a mounting piece for mounting the nuclear density meter.

3. The thermal high pressure separator of claim 2, wherein, The nuclear density meter comprises a radioactive source and a receiver, the mounting piece comprises a fixing seat, a hanging rope and a hanging rope clamp, the fixing seat is arranged on the outer sidewall of the cylinder, the receiver is arranged on the fixing seat, the hanging rope clamp is clamped at an opening of the separator body, one end of the hanging rope is connected with the hanging rope clamp, the other end of the hanging rope is connected with the radioactive source, the radioactive source is fixed in the interior of the cylinder and is located on the same horizontal plane as the receiver.

4. The thermal high pressure separator of claim 3, wherein, The cylinder is provided with a blind hole extending away from the receiver at the position of the receiver.

5. The thermal high pressure separator of claim 3, wherein, The fixing seat is fixedly connected with the outer sidewall of the cylinder.

6. The thermal high pressure separator of claim 5, wherein, The fixing seat is surfacing-welded with the cylinder.

7. The thermal high pressure separator of claim 6, wherein, The outer sidewall of the cylinder is provided with a surfacing layer, and a transition section with a slope is arranged between the surfacing layer and the cylinder.

8. The thermal high pressure separator of claim 7, wherein, The slope is 1:

3.

9. A thermal high pressure separator according to any of the claims 3-8, c h a r a c t e r i z e d i n that The fixing seat is arranged at the middle part of the cylinder.

10. A coal direct liquefaction system characterized by comprising: The high-pressure thermal separator comprises the high-pressure thermal separator according to any one of claims 1-9.

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