Tail gas recovery processing skid for triethylene glycol dehydration device

Abstract

The utility model discloses a triethylene glycol dehydration device tail gas recovery processing sledge, which relates to the technical field of natural gas processing, and comprises a pretreatment part and a main processing part, the pretreatment part comprises a cooler, a refrigerating unit and a gas-liquid separation tank, the refrigerating unit is used for providing a refrigerant for the cooler, and the cooler is used for reducing the temperature of tail gas; the gas-liquid separation tank is used for separating liquid in the tail gas; the main treatment part comprises a gas-liquid mixed transportation pump and an analysis tank, the gas-liquid mixed transportation pump and the analysis tank are in closed circulation, the gas-liquid mixed transportation pump is used for pressurizing tail gas, and the analysis tank is used for analyzing dissolved-state light hydrocarbon into fuel gas. Through the synergistic effect of the refrigerating unit and the cooler, the tail gas is cooled to be below the dew point of a high-dew-point gaseous substance, and liquid components in light hydrocarbon can be separated and liquid triethylene glycol can be recycled by combining the gas-liquid separation tank; a closed flash evaporation cycle is constructed by adopting an analysis tank and a gas-liquid multiphase pump, and dissolved-state light hydrocarbon is analyzed into fuel gas, so that the loss rate of triethylene glycol can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas processing technical field especially relates to a triethylene glycol dehydration device tail gas recovery processing sled. BACKGROUND

[0002] In the natural gas dehydration treatment process, triethylene glycol (TEG) dehydration device is widely used in the removal of water in natural gas. The regeneration system of the device will produce tail gas containing trace light hydrocarbon, water vapor and residual triethylene glycol (especially not containing sulfur tail gas) during operation. At present, the conventional treatment method for such tail gas in the industry is to directly introduce into the burning furnace for combustion, and the specific work flow is as follows:

[0003] 1. The tail gas discharged from the top of the triethylene glycol regeneration tower is transported to the burning furnace through the pipeline;

[0004] 2. The tail gas is completely combusted at 800-1200 DEG C by external fuel gas (such as natural gas) combustion;

[0005] 3. The combustion products (mainly CO2, water vapor and a small amount of NO X ) are discharged into the atmosphere through the chimney.

[0006] However, although this technology can timely treat the tail gas, its core depends on external fuel gas combustion, and essentially converts the recyclable resources (light hydrocarbon, triethylene glycol) into heat energy loss, which belongs to the typical "energy consumption" mode, and has the following disadvantages: first, the high-temperature cracking of triethylene glycol residues will occur in the process of tail gas combustion, resulting in increased triethylene glycol loss rate; second, high-temperature combustion will generate acid gases (such as CO2, NO X , SO2, SO3) and water vapor, and the acid gases are easily dissolved in water, which will accelerate the corrosion of the inner wall of the burning furnace and the flue, and thus the high-temperature alloy lining needs to be frequently replaced, resulting in increased maintenance cost. INVENTION CONTENTS

[0007] The utility model aims at providing a triethylene glycol dehydration device tail gas recovery processing sled, which can improve the resource utilization level of tail gas, reduce energy consumption and combustion product emission.

[0008] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a triethylene glycol dehydration device tail gas recovery processing sled, comprising:

[0009] A pretreatment part comprising a cooler, a refrigeration unit and a gas-liquid separation tank, the refrigeration unit is used to provide refrigerant for the cooler, the cooler is used to reduce the temperature of the tail gas, and the gas-liquid separation tank is used to separate the liquid in the tail gas;

[0010] The main processing unit comprises a gas-liquid mixed delivery pump and a resolving tank, and the gas-liquid mixed delivery pump and the resolving tank are closed circulation, the gas-liquid mixed delivery pump is used for pressurizing the tail gas, and the resolving tank is used for resolving the dissolved light hydrocarbon into fuel gas.

[0011] The technical principle of the utility model is as follows:

[0012] Under the joint action of the refrigerating unit and the cooler, the tail gas can be cooled to below the dew point of the high dew point gaseous substance, and then the liquid component in the light hydrocarbon and the liquid triethylene glycol can be separated by the gas-liquid separation tank; the dissolved light hydrocarbon can be resolved into fuel gas by the closed flash evaporation circulation formed by the resolving tank and the gas-liquid mixed delivery pump, so that the loss rate of the triethylene glycol can be reduced.

[0013] Further, the first inlet pipe is provided with a first switch valve, a first check valve, a first pressure gauge, a first flowmeter and a first temperature sensor, and the first inlet pipe is communicated with the low-pressure vent system, and a second switch valve is arranged between the first inlet pipe and the low-pressure vent system.

[0014] Further, the inlet pipe and the outlet pipe are arranged between the cooling unit and the cooler, the inlet pipe is provided with a first stop valve, a second pressure gauge and a second temperature sensor, and the outlet pipe is provided with a second stop valve, a third pressure gauge and a third temperature sensor.

[0015] Further, the gas-liquid separation tank is provided with a fourth pressure gauge, a fourth temperature sensor, a liquid level meter for monitoring the gas-liquid separation tank and a third switch valve for controlling the discharge of sewage.

[0016] Further, the second inlet pipe is arranged between the gas-liquid separation tank and the gas-liquid mixed delivery pump, and the second inlet pipe is provided with a fourth switch valve, a first regulating valve, a fifth switch valve, a second flowmeter, a second check valve and a fifth pressure gauge.

[0017] Further, the second inlet pipe is communicated with the low-pressure vent system, and a sixth switch valve, a second regulating valve, a vent valve and a seventh switch valve are arranged between the second inlet pipe and the low-pressure vent system.

[0018] Further, the third inlet pipe and the gas return pipe are arranged between the gas-liquid mixed delivery pump and the resolving tank, the third inlet pipe is provided with a third check valve and an eighth switch valve, and the gas return pipe is provided with a ninth switch valve and a third regulating valve.

[0019] Further, a balance tank in communication with the resolving tank is further included, the tenth switch valve, the fourth adjusting valve and the eleventh switch valve are arranged between the balance tank and the resolving tank, the fuel gas inlet pipe and the fuel gas outlet pipe in communication with the reboiler are arranged on the balance tank, the twelfth switch valve, the fifth adjusting valve, the third flow meter and the thirteenth switch valve are arranged on the fuel gas inlet pipe, and the fourteenth switch valve, the fourth flow meter, the sixth adjusting valve and the fifteenth switch valve are arranged on the fuel gas outlet pipe.

[0020] Further, the sixth pressure gauge is arranged on the balance tank, and the sixteenth switch valve is arranged between the sixth pressure gauge and the balance tank.

[0021] Further, the refrigerating unit, the cooler, the gas-liquid separation tank, the gas-liquid mixed conveying pump, the resolving tank and the balance tank are integrated on the same skid.

[0022] The utility model discloses the beneficial effects are:

[0023] 1, through the refrigerating unit and the cooler synergistic effect, the tail gas is cooled to the dew point below the high dew point gaseous material, and the liquid component in the light hydrocarbon can be separated in combination with the gas-liquid separation tank and the liquid triethylene glycol is recovered;

[0024] 2, adopting the resolving tank + gas-liquid mixed conveying pump constructs closed type flash evaporation cycle, and the dissolved light hydrocarbon is resolved as fuel gas, thereby the loss rate of triethylene glycol can be reduced;

[0025] 3, cancel the burning furnace and adopt low temperature treatment process, thereby the high temperature sour corrosion source can be eliminated thoroughly, and then the corrosion to equipment can be reduced;

[0026] 4, through the integration of cooling, separation, pressurization, resolving module in single skid, the floor area of the device can be reduced, and installation is facilitated simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the connection schematic drawing of the utility model.

[0028] In the above drawing:

[0029] 1, cooler;101, first switch valve;102, first check valve;103, first pressure gauge;104, first flow meter;105, first temperature sensor;106, second switch valve;

[0030] 2, refrigerating unit;201, first stop valve;202, second pressure gauge;203, second temperature sensor;204, second stop valve;205, third pressure gauge;206, third temperature sensor;207, water inlet stop valve;208, water outlet stop valve;209, nineteenth switch valve;210, twentieth switch valve;

[0031] 3, gas-liquid separation tank; 301, fourth pressure gauge; 302, fourth temperature sensor; 303, third switch valve; 304, fifth flow meter; 305, seventh regulating valve; 306, seventeenth switch valve; 307, liquid level meter;

[0032] 4, gas-liquid mixed delivery pump; 401, fourth switch valve; 402, first regulating valve; 403, fifth switch valve; 404, second flow meter; 405, second check valve; 406, fifth pressure gauge; 407, sixth switch valve; 408, second regulating valve; 409, vent valve; 410, seventh switch valve;

[0033] 5, analysis tank; 501, third check valve; 502, eighth switch valve; 503, ninth switch valve; 504, third regulating valve; 505, eighteenth switch valve; 506, seventh pressure gauge; 507, twenty-first switch valve;

[0034] 6, balance tank; 601, tenth switch valve; 602, fourth regulating valve; 603, eleventh switch valve; 604, twelfth switch valve; 605, fifth regulating valve; 606, third flow meter; 607, thirteenth switch valve; 608, fourteenth switch valve; 609, fourth flow meter; 610, sixth regulating valve; 611, fifteenth switch valve; 612, sixth pressure gauge; 613, sixteenth switch valve. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments of the present application; the structures described in various embodiments can be freely combined without structural or principle conflicts.

[0036] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] The following description, in conjunction with the accompanying drawings, describes some embodiments of the present invention:

[0039] like Figure 1 As shown, this utility model proposes a tail gas recovery and treatment skid for a triethylene glycol dehydration device, comprising:

[0040] The pretreatment section includes a cooler 1, a refrigeration unit 2, and a gas-liquid separator 3. The refrigeration unit 2 is used to supply refrigerant to the cooler 1, the cooler 1 is used to reduce the temperature of the exhaust gas, and the gas-liquid separator 3 is used to separate the liquid in the exhaust gas.

[0041] The main processing unit includes a gas-liquid mixing pump 4 and a desorption tank 5, and the gas-liquid mixing pump 4 and the desorption tank 5 are in a closed loop. The gas-liquid mixing pump 4 is used to pressurize the exhaust gas, and the desorption tank 5 is used to desorb dissolved light hydrocarbons into fuel gas.

[0042] With the combined action of the refrigeration unit 2 and the cooler 1, the exhaust gas can be cooled to below the dew point of high dew point gaseous substances. Combined with the gas-liquid separator 3, the liquid components in light hydrocarbons can be separated and liquid triethylene glycol can be recovered. By constructing a closed flash evaporation cycle through the desorption tank 5 and the gas-liquid mixing pump 4, the dissolved light hydrocarbons can be desorbed into fuel gas, thereby reducing the loss rate of triethylene glycol.

[0043] Furthermore, the cooler 1 is provided with a first air intake pipe, which is equipped with a first switch valve 101, a first check valve 102, a first pressure gauge 103, a first flow meter 104 and a first temperature sensor 105. The first air intake pipe is connected to a low-pressure venting system, and a second switch valve 106 is provided between the first air intake pipe and the low-pressure venting system.

[0044] The first switch valve 101, the first check valve 102, the first pressure gauge 103, the first flow meter 104 and the first temperature sensor 105 are sequentially arranged, the first check valve 102 can prevent the backflow of tail gas, the first pressure gauge 103, the first flow meter 104 and the first temperature sensor 105 can monitor the pressure, flow and temperature of the tail gas entering the first inlet pipeline. When the pressure, flow and temperature are normal, the first switch valve 101 is opened, the second switch valve 106 is closed, and the tail gas enters the cooler 1 normally through the first inlet pipeline; when the pressure, flow and temperature are abnormal, the first switch valve 101 is closed, the second switch valve 106 is opened, and the tail gas is discharged into the low-pressure venting system, thereby ensuring the safety of the equipment and facilitating the maintenance of the equipment.

[0045] Further, the water inlet pipeline and the water outlet pipeline are arranged between the cooling unit and the cooler 1, the first stop valve 201, the second pressure gauge 202 and the second temperature sensor 203 are arranged on the water inlet pipeline, and the second stop valve 204, the third pressure gauge 205 and the third temperature sensor 206 are arranged on the water outlet pipeline.

[0046] The cooling unit is used for providing refrigerant for the cooler 1, wherein the refrigerant is tap water, and the cooler 1 is provided with a refrigerant inlet and a refrigerant outlet, and the refrigerant inlet and the refrigerant outlet are respectively provided with a water inlet stop valve 207 and a water outlet stop valve 208. The working conditions of the refrigerant can be monitored in real time through the second pressure gauge 202, the second temperature sensor 203, the third pressure gauge 205 and the third temperature sensor 206. The nineteenth switch valve 209 and the twentieth switch valve 210 are arranged on the refrigeration unit 2, and are used for controlling the exhaust and sewage of the refrigeration unit.

[0047] Further, the fourth pressure gauge 301, the fourth temperature sensor 302, the liquid level meter 307 for monitoring the gas-liquid separation tank 3 and the third switch valve 303 for controlling the discharge of sewage are arranged on the gas-liquid separation tank 3.

[0048] The tail gas can be cooled to below the dew point of the high-dew-point gaseous substance through the refrigeration unit 2+the cooler 1, and then the liquid components in the light hydrocarbon and the liquid triethylene glycol can be separated and recovered through the gas-liquid separation tank 3, so that the supplement of the triethylene glycol can be reduced. The fourth pressure gauge 301 and the fourth temperature sensor 302 can monitor the conditions in the gas-liquid separation tank 3 in real time, the third switch valve 303 is opened for sewage treatment when the liquid level meter 307 monitors that the liquid level in the gas-liquid separation tank 3 is too high, and the third switch valve 303 is closed when the liquid level meter 307 monitors that the liquid level in the gas-liquid separation tank 3 is too low. The sewage pipeline is arranged between the gas-liquid separation tank 3 and the sewage treatment tank, and the fifth flow meter 304, the seventh adjusting valve 305 and the seventeenth switch valve 306 are sequentially arranged on the sewage pipeline.

[0049] Further, the second gas inlet pipeline is provided between the gas-liquid separation tank 3 and the gas-liquid mixed conveying pump 4, and the fourth switch valve 401, the first regulating valve 402, the fifth switch valve 403, the second flow meter 404, the second check valve 405 and the fifth pressure gauge 406 are arranged on the second gas inlet pipeline.

[0050] The gas separated by the gas-liquid separation tank 3 enters the gas-liquid mixed conveying pump 4, the gas-liquid mixed conveying pump 4 can pressurize the gas, the second flow meter 404 and the fifth pressure gauge 406 can be used to monitor the condition of the gas entering the gas-liquid mixed conveying pump 4 in real time, the first regulating valve 402 can be used to adjust the flow of the gas entering the gas-liquid mixed conveying pump 4, and the second check valve 405 can prevent the gas from backflowing.

[0051] Further, the second gas inlet pipeline is in communication with the low-pressure venting system, and the sixth switch valve 407, the second regulating valve 408, the venting valve 409 and the seventh switch valve 410 are arranged between the second gas inlet pipeline and the low-pressure venting system.

[0052] When the pressure of the gas from the gas-liquid separation tank 3 is abnormal, the fourth switch valve 401 and the fifth switch valve 403 are closed, and the sixth switch valve 407 and the seventh switch valve 410 are opened, so that the gas with abnormal pressure is discharged into the low-pressure venting system, thereby ensuring the safety of the device, and facilitating the maintenance of the device. The venting valve 409 can process the pressure fluctuation of the tail gas of the rectification column.

[0053] Further, the third gas inlet pipeline and the gas return pipeline are arranged between the gas-liquid mixed conveying pump 4 and the resolving tank 5, the third check valve 501 and the eighth switch valve 502 are arranged on the third gas inlet pipeline, and the ninth switch valve 503 and the third regulating valve 504 are arranged on the gas return pipeline.

[0054] The eighteenth switch valve 505 is arranged at the bottom of the resolving tank 5, the seventh pressure gauge 506 is arranged on the resolving tank 5, and the twenty-first switch valve 507 is arranged between the seventh pressure gauge 506 and the balance tank 6. The wet gas (containing triethylene glycol droplets and dissolved light hydrocarbon) from the gas-liquid separation tank 3 enters the resolving tank 5 after being pressurized by the gas-liquid mixed conveying pump 4, the pressure in the resolving tank 5 is adjusted by the third regulating valve 504 (lower than the critical pressure of light hydrocarbon dissolution), the light hydrocarbon is rapidly resolved from the triethylene glycol, and the gas-liquid two-phase of the upper gas phase and the lower liquid phase is formed. Part of the top light hydrocarbon gas is output as fuel gas to the subsequent device, and the other part is returned to the inlet of the resolving tank 5 through the gas-liquid mixed conveying pump 4, thereby maintaining the pressure balance of the system. The bottom triethylene glycol-rich liquid returns to the regeneration system rectification column through the eighteenth switch valve 505. Through the low-temperature flash resolution + closed circulation pressurization technology, the light hydrocarbon, triethylene glycol and water in the tail gas are efficiently separated and resourcefully utilized, which fundamentally overturns the traditional incineration treatment mode, and achieves a breakthrough in consumption reduction, emission reduction, corrosion prevention and operation economy.

[0055] Further, a balance tank 6 is further included in communication with the resolving tank 5, the tenth switch valve 601, the fourth regulating valve 602 and the eleventh switch valve 603 are arranged between the balance tank 6 and the resolving tank 5, the fuel gas inlet pipe and the fuel gas outlet pipe in communication with the reboiler are arranged on the balance tank 6, the twelfth switch valve 604, the fifth regulating valve 605, the third flow meter 606 and the thirteenth switch valve 607 are arranged on the fuel gas inlet pipe, and the fourteenth switch valve 608, the fourth flow meter 609, the sixth regulating valve 610 and the fifteenth switch valve 611 are arranged on the fuel gas outlet pipe.

[0056] The balance tank 6 can receive the light hydrocarbon fuel gas output by the resolving tank 5, absorb pressure fluctuation through volume buffering, eliminate the gas pulsation in the flash resolving process, and ensure the stable pressure of the fuel gas pipe network of the downstream reboiler. The external fuel gas (such as supplemental natural gas) is received through the fuel gas inlet pipe, mixed with the recovered light hydrocarbon in proportion, and then output to the reboiler through the fuel gas outlet pipe to dynamically match the heat load demand of the reboiler, thereby reducing the fluctuation of the fuel gas heat value and improving the control accuracy of the reboiler temperature. The device can preferentially use the light hydrocarbon fuel gas recovered by the resolving tank 5, and only supplement the external fuel gas when the amount of the output gas is insufficient, thereby realizing resource recycling and utilization, improving the self-sufficiency rate of the fuel gas, and thereby saving energy and reducing fuel cost.

[0057] Further, the sixth pressure gauge 612 and the sixteenth switch valve 613 arranged between the sixth pressure gauge 612 and the balance tank 6 are arranged on the balance tank 6.

[0058] Through the interlocking arrangement of the sixth pressure gauge 612 and the sixteenth switch valve 613, the fuel gas pipe network pressure can be prevented from exceeding the limit, thereby improving the safety of the system.

[0059] Further, the refrigeration unit 2, the cooler 1, the gas-liquid separation tank 3, the gas-liquid mixed transport pump 4, the resolving tank 5 and the balance tank 6 are integrated on the same skid.

[0060] By integrating the cooling, separation, pressurization and resolving modules into a single skid, the land occupation area of the device can be reduced, the installation is facilitated, and the installation period is reduced.

Claims

1. A triethylene glycol dehydration unit tail gas recovery processing skid, characterized by, The application relates to a tail gas treatment device. The pre-treatment part comprises a cooler (1), a refrigerating unit (2) and a gas-liquid separation tank (3), the refrigerating unit (2) is used for providing refrigerant for the cooler (1), the cooler (1) is used for reducing the temperature of tail gas, and the gas-liquid separation tank (3) is used for separating liquid in the tail gas. The main treatment part comprises a gas-liquid mixed conveying pump (4) and a resolving tank (5), the gas-liquid mixed conveying pump (4) and the resolving tank (5) are closed circulation, the gas-liquid mixed conveying pump (4) is used for pressurizing the tail gas, and the resolving tank (5) is used for resolving light hydrocarbon in a dissolved state into fuel gas.

2. A triethylene glycol dehydration unit tail gas recovery processing skid according to claim 1, characterized in that, A first air inlet pipeline is arranged on the cooler (1), a first switch valve (101), a first check valve (102), a first pressure gauge (103), a first flowmeter (104) and a first temperature sensor (105) are arranged on the first air inlet pipeline, the first air inlet pipeline is communicated with a low-pressure air release system, and a second switch valve (106) is arranged between the first air inlet pipeline and the low-pressure air release system.

3. A triethylene glycol dehydration unit tail gas recovery processing skid according to claim 1 or 2, characterized in that, A water inlet pipeline and a water outlet pipeline are arranged between the refrigerating unit and the cooler (1), a first stop valve (201), a second pressure gauge (202) and a second temperature sensor (203) are arranged on the water inlet pipeline, a second stop valve (204), a third pressure gauge (205) and a third temperature sensor (206) are arranged on the water outlet pipeline.

4. A triethylene glycol dehydration unit tail gas recovery processing skid as claimed in claim 1 or 2, characterized in that, A fourth pressure gauge (301), a fourth temperature sensor (302), a liquid level meter (307) for monitoring the gas-liquid separation tank (3) and a third switch valve (303) for controlling sewage discharge are arranged on the gas-liquid separation tank (3).

5. A triethylene glycol dehydration unit tail gas recovery processing skid as claimed in claim 1 or 2, characterized in that, A second air inlet pipeline is arranged between the gas-liquid separation tank (3) and the gas-liquid mixed conveying pump (4), a fourth switch valve (401), a first regulating valve (402), a fifth switch valve (403), a second flowmeter (404), a second check valve (405) and a fifth pressure gauge (406) are arranged on the second air inlet pipeline.

6. A triethylene glycol dehydration unit tail gas recovery processing skid as claimed in claim 5, wherein, The second air inlet pipeline is communicated with the low-pressure air release system, and a sixth switch valve (407), a second regulating valve (408), an air release valve (409) and a seventh switch valve (410) are arranged between the second air inlet pipeline and the low-pressure air release system.

7. A triethylene glycol dehydration unit tail gas recovery processing skid as claimed in claim 1 or 2, characterized by, A third air inlet pipeline and a gas return pipeline are arranged between the gas-liquid mixed conveying pump (4) and the resolving tank (5), a third check valve (501) and an eighth switch valve (502) are arranged on the third air inlet pipeline, and a ninth switch valve (503) and a third regulating valve (504) are arranged on the gas return pipeline.

8. A triethylene glycol dehydration unit tail gas recovery processing skid according to claim 1 or 2, characterized by, A balance tank (6) communicated with the resolving tank (5) is further arranged, a tenth switch valve (601), a fourth regulating valve (602) and an eleventh switch valve (603) are arranged between the balance tank (6) and the resolving tank (5), a fuel gas inlet pipeline and a fuel gas outlet pipeline communicated with a reboiler are arranged on the balance tank (6), a twelfth switch valve (604), a fifth regulating valve (605), a third flowmeter (606) and a thirteenth switch valve (607) are arranged on the fuel gas inlet pipeline, and a fourteenth switch valve (608), a fourth flowmeter (609), a sixth regulating valve (610) and a fifteenth switch valve (611) are arranged on the fuel gas outlet pipeline.

9. A triethylene glycol dehydration unit tail gas recovery processing skid as claimed in claim 8, wherein, A sixth pressure gauge (612) is arranged on the balance tank (6), and a sixteenth on-off valve (613) is arranged between the sixth pressure gauge (612) and the balance tank (6).

10. A triethylene glycol dehydration unit tail gas recovery processing skid as claimed in claim 9, wherein, The refrigerating unit (2), the cooler (1), the gas-liquid separation tank (3), the gas-liquid mixed conveying pump (4), the resolving tank (5) and the balance tank (6) are integrated on the same skid.

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