Low-temperature condensate treatment process and device for natural gas treatment plant deoiling and dewatering device
A technology of dehydration device and treatment process, which is applied in the direction of petroleum industry, gas fuel, fuel, etc., can solve the problem that the exhausted mixed gas cannot meet the requirements of fuel gas hydrocarbon dew point, etc., achieve remarkable energy saving effect, save external cold source, Improved stability and security effects
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Embodiment 1
[0034] A low-temperature condensate treatment process for a deoiling and dehydrating device in a natural gas treatment plant, comprising the following steps:
[0035] Step ①, the low-temperature condensate 1 is preheated by the non-condensable gas at the top of the condensate oil stabilization tower 7 in the primary gas-liquid heat exchanger 3, the temperature of the low-temperature condensate 1 rises, and at the same time, the non-condensable gas at the top of the tower passes through the low-temperature condensate Liquid 1 cools down and the temperature decreases;
[0036] In step ②, the low-temperature condensate 1 preheated in step ① is preheated for the second time by high-temperature stable condensate oil in the secondary gas-liquid heat exchanger 4, and the temperature rises to 29°C;
[0037] In step ③, the low-temperature condensate 1 after secondary preheating is separated into gas phase gas, alcohol-containing water and unstabilized condensate oil through the three-p...
Embodiment 2
[0052] On the basis of Example 1, the low-temperature condensate has a temperature of -15°C, a pressure of 5.5MPa, and a composition of C 1 ~C 11 + , water and methanol, wherein the water content is 16% (mol), the methanol molar content is 19% (mol), C 6 + The content is 46.44% (mol), C 1 ~C 5 The non-condensable gas content is 18.56% (mol).
[0053] The non-condensable gas at the top of the condensate stabilization tower 7 has a temperature of 45°C and a pressure of 0.4MPa, and is composed of C 1 ~C 11 + and saturated water, wherein the saturated water content is 4.92% (mol), C 1 ~C 5 The content is 93.62% (mol), C 6 + The content is 1.46% (mol).
[0054] The preheating and cooling described in step ① utilize the heat of the non-condensable gas at the top of the tower and the cooling capacity of the low-temperature condensate 1 at the same time, the temperature of the low-temperature condensate 1 rises from -15°C to 2°C, and the temperature of the non-condensable ...
Embodiment 3
[0059] On the basis of Example 1, the non-condensable gas at the top of the tower described in step ⑥ is mixed with the gas-phase gas of the three-phase separator. Since the condensed liquid in the two is re-gas-liquid balanced, part of the condensed liquid evaporates and absorbs heat, forming a temperature drop. , so that the temperature of the mixed gas is lower than the respective temperatures of the non-condensable gas at the top of the tower and the gas phase gas of the three-phase separator before mixing. When the mixed gas enters the low-temperature gas-liquid separator 9 for gas-liquid separation, it needs to be carried out at a low temperature of -10°C to -20°C to ensure that the hydrocarbon dew point of the mixed gas meets the requirements of the fuel gas, and the liquid returns to the top of the tower.
[0060] The stable condensate oil described in step ⑤ is heated by the high-temperature heat transfer oil 24 to form reboiling in the reboiler 8, and after multiple g...
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