Triethylene glycol barren solution circulation control system and triethylene glycol dehydration regeneration device

Abstract

The utility model relates to the technical field of natural gas dehydration, and provides a triethylene glycol barren solution circulation control system and a triethylene glycol dehydration regeneration device. The triethylene glycol barren solution circulation control system comprises a detection module, a processing module and an execution module, the detection module comprises a flow detection module, a pressure detection module and a temperature detection module, and the processing module is in communication connection with the flow detection module, the pressure detection module and the temperature detection module. The processing module is configured to be capable of collecting the flow, the pressure and the temperature obtained by the detection module and analyzing and calculating to obtain a control signal, the execution module is in communication connection with the processing module, and the execution module is configured to be capable of controlling the circulation amount of barren liquor entering the absorption tower according to the control signal. According to the triethylene glycol barren solution circulation control system, the whole device can be operated with minimum consumption, the reaction stability, rapidity and accuracy are improved, stable operation of equipment is guaranteed, the workload of field personnel is reduced, and automatic control is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of natural gas dehydration, and in particular to a triethylene glycol lean liquid circulation control system and a triethylene glycol dehydration regeneration device. Background Art

[0002] The TEG dehydration process is one of the most commonly used dehydration methods in the natural gas industry. Raw natural gas enters the bottom of the absorption tower and countercurrently contacts TEG lean liquid entering from the top. The dehydrated natural gas exits the top of the absorption tower, while the water-absorbed TEG rich liquid flows from the bottom to the regeneration tower. Heating removes water from the TEG rich liquid at low pressure and high temperature, regenerating it into TEG lean liquid for recycling.

[0003] The lean liquid circulation pump is one of the core equipment of the triethylene glycol dehydration and regeneration unit. Currently, the control of the lean liquid circulation pump requires operator intervention, and the circulation frequency is manually adjusted based on empirical values. The control process is relatively simple and extensive, and the stability, speed and accuracy of the triethylene glycol dehydration and regeneration unit are all lacking. In addition, the lean liquid circulation pump, as the main power-consuming equipment, causes energy waste to a certain extent. Utility Model Content

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a triethylene glycol lean liquid circulation control system and a triethylene glycol dehydration regeneration device.

[0005] A first aspect of the present application provides a triethylene glycol lean solution circulation control system, comprising:

[0006] The detection module includes a flow detection module, a pressure detection module, and a temperature detection module. The flow detection module is used to detect the flow rate of natural gas entering the absorption tower, the pressure detection module is used to detect the pressure of natural gas entering the absorption tower, and the temperature detection module is used to detect the temperature of natural gas entering the absorption tower;

[0007] a processing module, the processing module being in communication with the flow detection module, the pressure detection module, and the temperature detection module, respectively, and the processing module being configured to collect the flow, pressure, and temperature obtained by the detection modules, and to analyze and calculate to obtain a control signal;

[0008] An execution module is communicatively connected with the processing module to receive a control signal from the processing module, and the execution module is configured to control the circulation amount of the lean liquid entering the absorption tower according to the control signal.

[0009] Optionally, the flow detection module includes a pressure detection instrument;

[0010] And / or, the pressure detection module includes a temperature detection instrument;

[0011] And / or, the temperature detection module includes a flow detection instrument.

[0012] Optionally, the processing module includes a PLC controller.

[0013] Optionally, the execution module includes a circulation pump, and the circulation pump is configured to adjust the frequency according to the control signal to control the circulation amount of the lean liquid entering the absorption tower.

[0014] Optionally, the detection module further includes a liquid level detection module, which is communicatively connected to the processing module and transmits liquid level height information to the processing module.

[0015] Optionally, the liquid level detection module includes a liquid level detection instrument;

[0016] The liquid level detection instrument is used to be arranged on the absorption tower;

[0017] And / or, the liquid level detection instrument is used to be arranged on the buffer tank.

[0018] A second aspect of the present application provides a triethylene glycol dehydration and regeneration device, comprising an absorption tower, a natural gas inlet pipeline, and a triethylene glycol lean liquid circulation control system as described in any one of the above items, wherein the natural gas inlet pipeline is connected to the absorption tower to transport natural gas to the absorption tower, and the flow detection module, the pressure detection module, and the temperature detection module are arranged in the natural gas inlet pipeline.

[0019] Optionally, the triethylene glycol dehydration and regeneration device further includes a lean liquid circulation loop;

[0020] The lean liquid circulation loop includes a lean liquid inlet pipe and a lean liquid outlet pipe, wherein the lean liquid inlet pipe is connected to the top of the absorption tower, and the lean liquid outlet pipe is connected to the bottom of the absorption tower;

[0021] The execution module is disposed between the lean liquid inlet pipe and the lean liquid outlet pipe to control the circulation amount of the lean liquid.

[0022] Optionally, the triethylene glycol dehydration and regeneration device further includes a buffer tank, which is disposed between the execution module and the absorption tower, and the buffer tank and the absorption tower are connected via the lean liquid outlet pipe, and the buffer tank and the execution module are connected via a lean liquid circulation pipe.

[0023] Optionally, the triethylene glycol dehydration and regeneration device further includes a natural gas outlet pipeline, the natural gas inlet pipeline is connected to the bottom of the absorption tower, and the natural gas outlet pipeline is connected to the top of the absorption tower.

[0024] The technical solution provided by the embodiments of the present application has the following advantages compared with the prior art:

[0025] The triethylene glycol lean liquid circulation control system and triethylene glycol dehydration and regeneration device provided by the present application include a detection module, a processing module and an execution module. The detection module includes a flow detection module, a pressure detection module and a temperature detection module. The flow detection module is used to detect the flow of natural gas entering the absorption tower, the pressure detection module is used to detect the pressure of natural gas entering the absorption tower, and the temperature detection module is used to detect the temperature of natural gas entering the absorption tower. The flow, pressure and temperature information of natural gas entering the absorption tower can be obtained simultaneously through the detection module, and the corresponding natural gas saturated water content can be queried accordingly. The processing module is respectively communicated with the flow detection module, the pressure detection module and the temperature detection module. The processing module is configured to collect the flow, pressure and temperature obtained by the detection module, and analyze and calculate the flow, pressure and temperature. to the control signal; the execution module is communicatively connected with the processing module to receive the control signal from the processing module, and the execution module is configured to control the circulation amount of the lean liquid entering the absorption tower according to the control signal. The execution module can control the circulation amount of the lean liquid entering the absorption tower in real time according to the saturated water content of the natural gas entering the absorption tower. Through adaptive adjustment, the lean liquid can be maintained at a minimum circulation under the premise of corresponding to the saturated water content of the natural gas to meet the dehydration effect, which can reduce the kinetic energy required for the lean liquid circulation and achieve energy saving. It can also reduce the heat energy required for the lean liquid heating and regeneration process. The triethylene glycol lean liquid circulation control system can operate the entire device with minimum consumption, improve the reaction stability, speed and accuracy, ensure the smooth operation of the equipment, reduce the workload of on-site personnel, and realize automatic control. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 This is a schematic diagram of a triethylene glycol lean solution circulation control system according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of a triethylene glycol dehydration and regeneration device according to an embodiment of the present invention.

[0030] In the figure: 1. Detection module; 11. Flow detection module; 12. Pressure detection module; 13. Temperature detection module; 14. Liquid level detection module; 2. Processing module; 3. Execution module; 4. Absorption tower; 5. Natural gas inlet pipeline; 6. Lean liquid circulation loop; 61. Lean liquid inlet pipeline; 62. Lean liquid outlet pipeline; 63. Lean liquid circulation pipeline; 7. Buffer tank; 8. Natural gas outlet pipeline. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present application, not all of the embodiments.

[0033] The triethylene glycol lean liquid circulation control system and the triethylene glycol dehydration regeneration device are described in detail below through specific embodiments:

[0034] Reference Figure 1 and Figure 2 As shown, some embodiments of the present invention provide a triethylene glycol lean solution circulation control system, which includes a detection module 1, a processing module 2 and an execution module 3.

[0035] Among them, the detection module 1 includes a flow detection module 11, a pressure detection module 12 and a temperature detection module 13. The flow detection module 11 is used to detect the flow rate of natural gas entering the absorption tower 4, the pressure detection module 12 is used to detect the pressure of natural gas entering the absorption tower 4, and the temperature detection module 13 is used to detect the temperature of natural gas entering the absorption tower 4. Through the detection module 1, the flow rate, pressure and temperature information of natural gas entering the absorption tower 4 can be obtained simultaneously, and the corresponding saturated water content of natural gas can be queried accordingly.

[0036] The processing module 2 is communicated with the flow detection module 11, the pressure detection module 12 and the temperature detection module 13 respectively. The processing module 2 is configured to collect the flow, pressure and temperature obtained by the detection module 1, and analyze and calculate to obtain a control signal; the execution module 3 is communicated with the processing module 2 to receive the control signal from the processing module 2. The execution module 3 is configured to control the circulation amount of the lean liquid entering the absorption tower 4 according to the control signal.

[0037] That is, the execution module 3 can control the circulation volume of the lean liquid entering the absorption tower 4 in real time according to the saturated water content of the natural gas entering the absorption tower 4. Through adaptive adjustment, the lean liquid can be maintained at a minimum circulation volume under the premise of meeting the dehydration effect corresponding to the saturated water content of the natural gas. This can reduce the kinetic energy required for the lean liquid circulation, achieve energy-saving effects, and also reduce the heat energy required for the lean liquid heating and regeneration process. The triethylene glycol lean liquid circulation control system can operate the entire device with minimal consumption, improve the reaction stability, speed and accuracy, ensure the smooth operation of the equipment, reduce the workload of on-site personnel, and realize automatic control.

[0038] In some embodiments, the flow detection module 11 includes a pressure detection instrument to obtain the pressure parameters of the natural gas entering the absorption tower 4 through the pressure detection instrument, the pressure detection module 12 includes a temperature detection instrument to obtain the temperature parameters of the natural gas entering the absorption tower 4 through the temperature detection instrument, the temperature detection module 13 includes a flow detection instrument to obtain the flow parameters of the natural gas entering the absorption tower 4 through the flow detection instrument, the processing module 2 includes a PLC controller, and the execution module 3 includes a circulation pump, which is configured to adjust the frequency according to the control signal to control the circulation amount of the lean liquid entering the absorption tower 4.

[0039] In specific implementation, by querying SY / T0076 "Natural Gas Dehydration Design Code", the natural gas saturated water content (mg / m3) corresponding to the current natural gas pressure and temperature can be obtained. 3 ).

[0040] According to the natural gas flow rate (m 3 / h), the theoretical dehydration rate required by the device can be calculated by the following formula: gas saturated water content (mg / m 3 )×flow rate(m 3 / h)÷1000000=theoretical dehydration rate (kg / h).

[0041] Furthermore, by consulting SY / T0076 "Natural Gas Dehydration Design Code", it is found that 30L of triethylene glycol lean liquid can absorb 1kg of water. By further calculation, the theoretical circulation volume of triethylene glycol lean liquid can be obtained: theoretical dehydration rate (kg / h) × lean liquid usage (30L / kg) = theoretical lean liquid circulation volume (L / h).

[0042] During actual commissioning, due to the complexity and uncertainty of actual field conditions in various regions, a margin coefficient can be determined during the commissioning phase to ensure effective natural gas dehydration. Finally, a further calculation is performed to determine the actual TEG lean liquid circulation rate: Theoretical lean liquid circulation rate (L / h) × margin coefficient = Actual lean liquid circulation rate (L / h). It should be understood that the actual TEG lean liquid circulation rate is the minimum circulation rate required to achieve effective dehydration.

[0043] On the premise that the actual circulation volume of the lean liquid is known, the corresponding frequency of the required minimum circulation volume can be obtained according to the flow rate values ​​of each frequency provided by the circulation pump manufacturer, thereby realizing intelligent automatic control of the circulation pump frequency, and then being able to control the circulation volume of the lean liquid entering the absorption tower 4 to reduce the operating consumption of the device.

[0044] Of course, it should be noted that the processing module 2 can also be other types of processors, such as a single-chip microcomputer, etc. This application does not limit this, as long as it can calculate the control signal for controlling the execution module 3 based on the flow, pressure and temperature information when the natural gas enters the absorption tower 4 and transmit it.

[0045] In some embodiments, the detection module 1 further includes a liquid level detection module 14, which is in communication with the processing module 2 and transmits liquid level information to the processing module 2. Specifically, the liquid level detection module 14 includes a liquid level detection instrument, which is configured to be installed on the absorption tower 4; and / or, the liquid level detection instrument is configured to be installed on the buffer tank 7. In other words, by detecting the liquid level in the absorption tower 4 or the buffer tank 7 using the liquid level detection instrument, the control module can transmit a command to increase or decrease the lean liquid circulation volume to the execution module 3 based on the liquid level information in each container. This can prevent the liquid level in each container from being too high or too low, further improving the safety of the device.

[0046] Reference Figure 2 As shown, other embodiments of the present application provide a triethylene glycol dehydration and regeneration device, including an absorption tower 4, a natural gas inlet pipeline 5 and a triethylene glycol lean liquid circulation control system as in any of the above embodiments, the natural gas inlet pipeline 5 is connected to the absorption tower 4 to transport natural gas to the absorption tower 4, and a flow detection module 11, a pressure detection module 12 and a temperature detection module 13 are arranged in the natural gas inlet pipeline 5.

[0047] The triethylene glycol dehydration regeneration device provided in the embodiment of the present application includes the triethylene glycol lean liquid circulation control system of any of the above embodiments, and thus has the beneficial effects of the triethylene glycol lean liquid circulation control system of any of the above embodiments, which will not be repeated here.

[0048] In specific implementation, by simply modifying the original pipeline and adding some detection instruments and PLC controllers, the triethylene glycol dehydration regeneration unit can achieve automatic control of the lean liquid circulation volume, that is, it can realize the intelligent and energy-saving transformation of the triethylene glycol dehydration regeneration unit that has been put into production.

[0049] In some embodiments, the triethylene glycol dehydration and regeneration device further includes a lean liquid circulation loop 6, which includes a lean liquid inlet pipe 61 and a lean liquid outlet pipe 62. The lean liquid inlet pipe 61 is connected to the top of the absorption tower 4, and the lean liquid outlet pipe 62 is connected to the bottom of the absorption tower 4. The execution module 3 is disposed between the lean liquid inlet pipe 61 and the lean liquid outlet pipe 62 to control the amount of lean liquid circulation. Of course, the execution module 3 can provide circulation power to enable the lean liquid to be circulated between the absorption tower 4 and the lean liquid circulation loop 6, thereby achieving dehydration of the natural gas.

[0050] Reference Figure 2 As shown, the triethylene glycol dehydration regeneration device also includes a buffer tank 7, which is arranged between the execution module 3 and the absorption tower 4, and the buffer tank 7 and the absorption tower 4 are connected through a lean liquid outlet pipe 62, and the buffer tank 7 and the execution module 3 are connected through a lean liquid circulation pipe 63. When the execution module 3 adjusts the lean liquid circulation volume in the lean liquid circulation loop 6, the buffer tank 7 can accommodate excess lean liquid and can also provide more lean liquid for circulation.

[0051] Specifically, the lean liquid in the absorption tower 4 can enter the buffer tank 7 through the lean liquid outlet pipe 62. The lean liquid circulation pump as the execution module 3 can provide lean liquid circulation power. The lean liquid in the buffer tank 7 can be sent back into the absorption tower 4 by the lean liquid circulation pump according to actual needs to dehydrate the natural gas in the absorption tower 4.

[0052] In some embodiments, the TEG dehydration and regeneration device further includes a natural gas outlet pipeline 8. The natural gas inlet pipeline 5 is connected to the bottom of the absorption tower 4, and the natural gas outlet pipeline 8 is connected to the top of the absorption tower 4. It is understood that the natural gas enters the bottom of the absorption tower 4 through the natural gas outlet pipeline 8 and can gradually float upward. During the floating process, it can contact the lean liquid in the absorption tower 4 to be dehydrated. The dehydrated natural gas can be discharged through the natural gas outlet pipeline 8 at the top of the absorption tower 4.

[0053] During the lean liquid circulation process, under the action of the execution module 3, the lean liquid in the absorption tower 4 can be recycled. During the lean liquid circulation process, the lean liquid circulation volume can be controlled and adjusted in real time by the processing module 2, thereby maintaining the lean liquid at a minimum circulation volume, thereby improving energy saving effects.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0055] The above are merely specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to these embodiments herein, but is intended to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A triethylene glycol lean solution circulation control system, characterized in that: include: The detection module (1) comprises a flow detection module (11), a pressure detection module (12) and a temperature detection module (13), wherein the flow detection module (11) is used to detect the flow of natural gas entering the absorption tower (4), the pressure detection module (12) is used to detect the pressure of the natural gas entering the absorption tower (4), and the temperature detection module (13) is used to detect the temperature of the natural gas entering the absorption tower (4); a processing module (2), the processing module (2) being in communication with the flow detection module (11), the pressure detection module (12) and the temperature detection module (13), respectively; the processing module (2) being configured to collect the flow, pressure and temperature obtained by the detection module (1), and to analyze and calculate to obtain a control signal; An execution module (3) is communicatively connected to the processing module (2) to receive a control signal from the processing module (2), and the execution module (3) is configured to control the amount of lean liquid circulating into the absorption tower (4) according to the control signal.

2. The triethylene glycol lean solution circulation control system according to claim 1, characterized in that: The flow detection module (11) includes a pressure detection instrument; And / or, the pressure detection module (12) includes a temperature detection instrument; And / or, the temperature detection module (13) includes a flow detection instrument.

3. The triethylene glycol lean solution circulation control system according to claim 1, characterized in that: The processing module (2) includes a PLC controller.

4. The triethylene glycol lean solution circulation control system according to claim 1, characterized in that: The execution module (3) comprises a circulation pump, and the circulation pump is configured to be able to adjust the frequency according to the control signal to control the circulation amount of the lean liquid entering the absorption tower (4).

5. The triethylene glycol lean solution circulation control system according to claim 1, characterized in that: The detection module (1) further comprises a liquid level detection module (14), wherein the liquid level detection module (14) is in communication connection with the processing module (2) and transmits liquid level height information to the processing module (2).

6. The triethylene glycol lean solution circulation control system according to claim 5, characterized in that: The liquid level detection module (14) includes a liquid level detection instrument; The liquid level detection instrument is used to be arranged on the absorption tower (4); And / or, the liquid level detection instrument is used to be arranged on the buffer tank (7).

7. A triethylene glycol dehydration and regeneration device, characterized in that: The invention comprises an absorption tower (4), a natural gas inlet pipeline (5) and a triethylene glycol lean liquid circulation control system according to any one of claims 1 to 6, wherein the natural gas inlet pipeline (5) is connected to the absorption tower (4) to transport natural gas to the absorption tower (4), and the flow detection module (11), the pressure detection module (12) and the temperature detection module (13) are arranged in the natural gas inlet pipeline (5).

8. The triethylene glycol dehydration and regeneration device according to claim 7, characterized in that: The triethylene glycol dehydration and regeneration device further comprises a lean liquid circulation loop (6); The lean liquid circulation loop (6) comprises a lean liquid inlet pipe (61) and a lean liquid outlet pipe (62), wherein the lean liquid inlet pipe (61) is connected to the top of the absorption tower (4), and the lean liquid outlet pipe (62) is connected to the bottom of the absorption tower (4); The execution module (3) is arranged between the lean liquid inlet pipe (61) and the lean liquid outlet pipe (62) to control the lean liquid circulation volume.

9. The triethylene glycol dehydration and regeneration device according to claim 8, characterized in that: The triethylene glycol dehydration and regeneration device further comprises a buffer tank (7), which is arranged between the execution module (3) and the absorption tower (4), and the buffer tank (7) and the absorption tower (4) are communicated through the lean liquid outlet pipe (62), and the buffer tank (7) and the execution module (3) are communicated through the lean liquid circulation pipe (63).

10. The triethylene glycol dehydration and regeneration device according to claim 7, characterized in that: The triethylene glycol dehydration and regeneration device further comprises a natural gas outlet pipeline (8), the natural gas inlet pipeline (5) is connected to the bottom of the absorption tower (4), and the natural gas outlet pipeline (8) is connected to the top of the absorption tower (4).

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