Automatic condensate collecting device in triethylene glycol reboiler pipeline

Abstract

The utility model discloses a kind of triethylene glycol reboiler pipeline condensate automatic collection devices, including triethylene glycol intake pipeline, vent pipeline, drainage pipeline and condensate drainage pipeline, wherein triethylene glycol intake pipeline includes triethylene glycol reboiler, frequency conversion fan, heat exchanger and gas-liquid separator;Above-mentioned vent pipeline and drainage pipeline are respectively connected to above-mentioned gas-liquid separator, wherein drainage pipeline includes filter, sewage pump and sewage tank;The condensate drainage pipeline is connected between triethylene glycol reboiler export end and sewage pump, including water collection section and automatic drainage device, automatic drainage device includes pipeline intercommunication ball valve, stop valve, automatic drain valve and check valve.The utility model structure is simple, realize the automatic collection of condensate in triethylene glycol system reboiler to Roots blower pipeline, avoid liquid water to flow into Roots blower, reduce Roots blower failure rate, and then improve tail gas recovery device operating efficiency and reliability.

Description

Technical Field

[0001] This utility model relates to the field of gas storage gas extraction technology engineering technology, specifically to an automatic condensate collection device in a triethylene glycol reboiler pipeline. Background Technology

[0002] During the gas extraction process at gas storage facilities, a certain amount of gaseous and liquid water is typically carried along with the gas. This not only causes serious problems such as corrosion of gathering and transportation pipelines, but also results in the extracted natural gas having an excessively high content of gaseous and liquid water, failing to meet the standards for finished natural gas pipeline transportation. Therefore, natural gas dehydration is necessary. Triethylene glycol dehydration units are one of the commonly used and relatively mature natural gas dehydration devices. This type of device utilizes the hydrophilicity and high boiling point of triethylene glycol to extract water vapor from natural gas, thereby reducing the content of gaseous and liquid water in the gas production. After the triethylene glycol extracts the gaseous and liquid water from the natural gas, a triethylene glycol regeneration device (i.e., a triethylene glycol reboiler) is used to heat the triethylene glycol-rich liquid, which is rich in gaseous and liquid water, to separate the water from the triethylene glycol. The separated water vapor is the tail gas produced by the triethylene glycol regeneration device, which then provides kinetic energy for the tail gas transmission through a Roots blower. However, due to the structural characteristics of the Roots blower, it has high requirements for the gaseous uniformity of the working medium. Only gaseous media are allowed in the inflowing fluid. If liquid media are present, it can easily cause damage to the Roots blower. However, water molecules in the natural gas in the pipeline connecting the triethylene glycol reboiler to the tail gas skid are easily affected by low ambient temperature. This causes condensation to form around the pipe wall due to radiative heat transfer. When this condensation enters the downstream Roots blower, it can easily cause the Roots blower to malfunction or be damaged. Utility Model Content

[0003] The purpose of this invention is to solve the problem of condensate in the reboiler to tail gas skid pipeline in the prior art, and to provide an automatic condensate collection device in the triethylene glycol reboiler pipeline.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an automatic condensate collection device in a triethylene glycol reboiler pipeline, comprising a triethylene glycol inlet pipeline, a vent pipeline, a drain pipeline, and a condensate drain pipeline, wherein the triethylene glycol inlet pipeline includes a triethylene glycol reboiler, a variable frequency fan, a heat exchanger, and a gas-liquid separator connected in sequence; the vent pipeline and the drain pipeline are respectively connected to the gas-liquid separator in the triethylene glycol inlet pipeline, wherein the drain pipeline includes a filter, a sewage pump, and a sewage tank connected in sequence; the condensate drain pipeline is connected between the outlet end of the triethylene glycol reboiler and the sewage pump, and includes a water collection section and an automatic drainage device, wherein the automatic drainage device includes a ball valve, a stop valve, an automatic drain valve, and a check valve connected in sequence.

[0005] Furthermore, the automatic drainage device in the condensate drain pipeline also includes a manual drain pipeline, which is connected to the outlet of the above-mentioned water collection section through a three-way valve to achieve parallel connection with the above-mentioned ball valve connecting pipeline. A manual drain valve is connected and installed on the manual drain pipeline.

[0006] Furthermore, an exhaust gas inlet control valve is installed on the connecting pipe between the triethylene glycol reboiler and the variable frequency fan in the triethylene glycol inlet pipeline, an inlet control valve for the heat exchanger is installed on the connecting pipe between the variable frequency fan and the heat exchanger, and an inlet control valve for the gas-liquid separator is installed on the connecting pipe between the heat exchanger and the gas-liquid separator.

[0007] Furthermore, the venting pipeline includes a reboiler venting pipeline and a separator venting pipeline, wherein the reboiler venting pipeline is connected to the connecting pipeline between the above-mentioned tail gas inlet control valve and the variable frequency fan, and a reboiler venting control valve is installed on it; the separator venting pipeline is connected to the gas outlet of the above-mentioned gas-liquid separator, and a separator venting control valve is installed on it; both the reboiler venting pipeline and the separator venting pipeline are connected to the venting and exhaust port.

[0008] Furthermore, a separator drain control valve is installed on the connecting pipe between the filter and the gas-liquid separator in the drain pipeline, an inlet control valve is installed on the connecting pipe between the filter and the sewage pump, and a manual drain valve is installed on the connecting pipe between the sewage pump and the sewage tank.

[0009] Furthermore, the inlet end of the aforementioned water collection section is connected to the connecting pipe at the tail gas outlet end of the triethylene glycol reboiler via a tee, and is located at the lower end of the tail gas connecting pipe. The diameter of the connecting pipe of the water collection section is greater than or equal to the diameter of the tee fitting.

[0010] Furthermore, the aforementioned variable frequency fan uses a Roots blower.

[0011] Furthermore, the gas-liquid separator is also equipped with a gas-liquid separator level transmitter, the signal or line of which is connected to the sewage pump.

[0012] Compared with existing technologies, this invention has the following advantages: The overall structure of this invention is simple, enabling automatic collection of condensate from the reboiler to the Roots blower pipeline in the triethylene glycol system. This avoids the fluid flowing into the Roots blower containing liquid water, reducing the Roots blower failure rate and thus improving the operating efficiency and reliability of the exhaust gas recovery device. Simultaneously, through the collection and treatment of condensate, effective recovery of liquid wastewater is achieved, eliminating the environmental problems caused by the on-site discharge of liquid wastewater (condensate). Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall device flow of this utility model; In the diagram: the arrows indicate the direction of flow; 100. Triethylene glycol inlet line; 200. Vent line; 300. Drain line; 400. Condensate drain line. 1. Triethylene glycol reboiler; 2. Roots blower; 3. Heat exchanger; 4. Gas-liquid separator; 5. Vent and exhaust port; 6. Wastewater tank; 7. Wastewater pump; 8. Filter; 9. Gas-liquid separator level transmitter; 10. Water collection section; 11. Automatic drain valve; 12. Check valve; 101. Tail gas inlet control valve; 102. Heat exchanger inlet control valve; 103. Gas-liquid separator inlet control valve; 104. Reboiler vent control valve; 105. Separator vent control valve; 106. Manual drain valve; 107. Liquid inlet control valve; 108. Separator drain control valve; 109. Ball valve; 110. Shut-off valve; 111. Manual drain valve. Detailed Implementation

[0014] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0015] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings: like Figure 1 As shown, an automatic condensate collection device for a triethylene glycol reboiler pipeline includes a triethylene glycol inlet pipeline 100, a vent pipeline 200, a drain pipeline 300, and a condensate drain pipeline 400. The main pipeline is the triethylene glycol inlet pipeline 100, which includes a triethylene glycol reboiler 1, a variable frequency fan, a heat exchanger 3, and a gas-liquid separator 4 connected in sequence. The variable frequency fan is a Roots blower 2. The triethylene glycol reboiler 1 generates a vapor tail gas by heating and regenerating the triethylene glycol solution. The tail gas generated by the triethylene glycol reboiler 1 is then powered by the Roots blower 2 and transported to the subsequent heat exchanger 3. In the heat exchanger 3, heat exchange occurs, the temperature is reduced, and some moisture and light hydrocarbon components are initially condensed. The gas and liquid phases after cooling by the heat exchanger 3 enter the gas-liquid separator 4, where the gas phase and liquid phase components are further separated and then discharged from the gas outlet and liquid outlet, respectively.

[0016] In the above-mentioned triethylene glycol inlet pipeline 100, a tail gas inlet control valve 101 is installed in series on the connecting pipeline between the exhaust end of the triethylene glycol reboiler 1 and the Roots blower 2; a heat exchanger inlet control valve 102 is installed in series on the connecting pipeline between the Roots blower 2 and the heat exchanger 3; and a gas-liquid separator inlet control valve 103 is installed in series on the connecting pipeline between the heat exchanger 3 and the gas-liquid separator 4.

[0017] The aforementioned venting pipeline 200 includes a reboiler venting pipeline and a separator venting pipeline. The reboiler venting pipeline is connected to the connecting pipeline between the aforementioned tail gas inlet control valve 101 and the Roots blower 2, and a reboiler venting control valve 104 is installed in series on it. The separator venting pipeline is connected to the gas outlet of the aforementioned gas-liquid separator 4, and a separator venting control valve 105 is installed in series on it. Both the reboiler venting pipeline and the separator venting pipeline are connected to the venting and exhaust port 5 for discharge, thereby achieving venting.

[0018] The aforementioned drain pipe 300 is connected to the liquid outlet of the aforementioned gas-liquid separator 4, and includes a separator drain control valve 108, a filter 8, a liquid inlet control valve 107, a sewage pump 7, a drain manual valve 106, and a sewage tank 6 connected in sequence. The filter 8 filters to remove solid impurities, and the sewage tank 6 can be connected to the gas storage tank sewage unified treatment system and transported away by sewage truck for treatment.

[0019] The condensate drain pipe 400 is connected and installed between the tail gas outlet pipe of the triethylene glycol reboiler 1 and the wastewater pump 7, and includes a water collection section 10 and an automatic drainage device. The automatic drainage device includes a ball valve 109, a stop valve 110, an automatic drain valve 11, and a check valve 12, which are connected sequentially by connecting pipes. The automatic drain valve 11 is an automatic float-type drain valve. The water collection section 10 is connected to the lower end of the tail gas outlet pipe via a tee, located between the triethylene glycol reboiler 1 and the tail gas inlet control valve 101, to collect water. The outlet height of section 10 should be lower than the inlet height, following a natural gradient. The diameter of the connecting pipe of the water collection section 10 should be greater than or equal to the diameter of the connector of the aforementioned tee fitting. This ensures the collection of condensate flowing into the outlet pipe of the triethylene glycol reboiler 1, preventing condensate from accumulating and entering the connecting pipe of the subsequent Roots blower 2. The aforementioned shut-off valve 110 regulates the condensate flow rate, the automatic drain valve 11 automatically drains accumulated condensate, and the check valve 12 prevents backflow of condensate and wastewater, ensuring unidirectional flow in the condensate drain pipe 400. The condensate drain pipe 400 also includes a manual drain line, connected to the outlet of the water collection section 10 via a tee valve, forming a parallel connection with the connecting pipe of the automatic drainage device. A manual drain valve 111 is connected in series on the manual drain line. When the automatic drainage device cannot meet the condensate drainage function or malfunctions, the condensate is drained by opening the manual drain valve 111.

[0020] The gas-liquid separator 4 is also equipped with a gas-liquid separator level transmitter 9 for detecting the liquid level in the tank of the gas-liquid separator 4. It is connected to the sewage pump 7 via signal or line. When the liquid level in the tank of the gas-liquid separator 4 exceeds a certain set value, it transmits an electrical signal to the sewage pump 7 to control its automatic start and open the corresponding valves on the connecting pipeline, so as to realize the automatic liquid discharge function and keep the liquid level in the tank of the gas-liquid separator 4 always controlled between 20-80%.

[0021] The specific working principle is as follows: In the aforementioned condensate drain pipe 400, the water collection section 10 is located at the lower position of the tail gas outlet pipe of the triethylene glycol reboiler 1. The condensate formed in the connecting pipe from the triethylene glycol reboiler 1 to the tail gas skid flows into the collection section 10 through the inlet, and then flows to the sewage pump 7 through the ball valve 109, the shut-off valve 110, the automatic drain valve 11, and the check valve 12. The sewage is then discharged into the sewage tank 6 through the operation of the sewage pump 7 to achieve recycling and disposal, thus preventing the condensate from entering the Roots blower 2 and causing it to malfunction.

[0022] The equipment structures involved in the above technical solutions can mostly adopt the corresponding device structures in existing technologies, and will not be described in detail here.

[0023] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. An automatic condensate collection device for a triethylene glycol reboiler pipeline, characterized in that: The system includes a triethylene glycol inlet pipeline, a vent pipeline, a drain pipeline, and a condensate drain pipeline. The triethylene glycol inlet pipeline includes a triethylene glycol reboiler, a variable frequency fan, a heat exchanger, and a gas-liquid separator connected in sequence. The vent pipeline and the drain pipeline are respectively connected to the gas-liquid separator in the triethylene glycol inlet pipeline. The drain pipeline includes a filter, a sewage pump, and a sewage tank connected in sequence. The condensate drain pipeline is connected between the outlet end of the triethylene glycol reboiler and the sewage pump, and includes a water collection section and an automatic drainage device. The automatic drainage device includes a ball valve, a stop valve, an automatic drain valve, and a check valve connected in sequence.

2. The automatic condensate collection device in a triethylene glycol reboiler pipeline according to claim 1, characterized in that: The automatic drainage device in the condensate drain pipeline also includes a manual drain pipeline, which is connected to the outlet of the above-mentioned water collection section through a three-way valve to achieve parallel connection with the above-mentioned ball valve connecting pipeline. A manual drain valve is connected and installed on the manual drain pipeline.

3. The automatic condensate collection device in the triethylene glycol reboiler pipeline according to claim 1, characterized in that: A tail gas inlet control valve is installed on the connecting pipe between the triethylene glycol reboiler and the variable frequency fan in the triethylene glycol inlet pipeline; a heat exchanger inlet control valve is installed on the connecting pipe between the variable frequency fan and the heat exchanger; and a gas-liquid separator inlet control valve is installed on the connecting pipe between the heat exchanger and the gas-liquid separator.

4. The automatic condensate collection device in a triethylene glycol reboiler pipeline according to claim 3, characterized in that: The venting pipeline includes a reboiler venting pipeline and a separator venting pipeline. The reboiler venting pipeline is connected to the connecting pipeline between the exhaust gas inlet control valve and the variable frequency fan, and a reboiler venting control valve is installed on it. The separator venting pipeline is connected to the gas outlet of the gas-liquid separator, and a separator venting control valve is installed on it. Both the reboiler venting pipeline and the separator venting pipeline are connected to the venting and exhaust port.

5. The automatic condensate collection device in a triethylene glycol reboiler pipeline according to claim 1, characterized in that: A separator drain control valve is installed on the connecting pipe between the filter and the gas-liquid separator in the drain pipeline, an inlet control valve is installed on the connecting pipe between the filter and the sewage pump, and a manual drain valve is installed on the connecting pipe between the sewage pump and the sewage tank.

6. The automatic condensate collection device in the triethylene glycol reboiler pipeline according to claim 1, characterized in that: The inlet end of the aforementioned water collection section is connected to the connecting pipe at the tail gas outlet end of the triethylene glycol reboiler via a tee, and is located at the lower end of the tail gas connecting pipe. The diameter of the connecting pipe of the water collection section is greater than or equal to the diameter of the tee fitting.

7. The automatic condensate collection device in a triethylene glycol reboiler pipeline according to claim 1, characterized in that: The aforementioned variable frequency fan uses a Roots blower.

8. The automatic condensate collection device in the triethylene glycol reboiler pipeline according to claim 1, characterized in that: The aforementioned gas-liquid separator is also equipped with a gas-liquid separator level transmitter, the signal or line of which is connected to the sewage pump.

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