Natural gas heavy hydrocarbon removal device

Abstract

The natural gas heavy hydrocarbon removal device comprises a heat exchanger, a heavy hydrocarbon separator and a heavy hydrocarbon adsorption system, the heat exchanger, the heavy hydrocarbon separator and the heavy hydrocarbon adsorption system are connected through a pipeline; the heavy hydrocarbon adsorption system comprises a first heavy hydrocarbon adsorber, a second heavy hydrocarbon adsorber and a third heavy hydrocarbon adsorber which are connected in parallel. The heavy hydrocarbon removal device for the natural gas has the advantages that the natural gas can be cooled through the heat exchanger, so that heavy hydrocarbon substances in the gas are separated, a product with corresponding purity is obtained, the economic value of the product is improved, and the requirement of subsequent production is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas's purification and separation, in particular to a natural gas heavy hydrocarbon removal device. BACKGROUND

[0002] In the natural gas liquefaction process, because the heavy hydrocarbon melting point is lower, will liquefy before the methane liquefaction, if not remove it completely, will lead to equipment, pipeline and valve freeze block, cause economic loss, heavy even safety accident. Aiming at the heavy hydrocarbon component in natural gas, need a natural gas heavy hydrocarbon removal device, remove the heavy hydrocarbon in natural gas, obtain corresponding purity natural gas product, satisfy market or production needs. SUMMARY

[0003] The utility model discloses a natural gas heavy hydrocarbon removal device.

[0004] The natural gas heavy hydrocarbon removal device of the utility model, including the heat exchanger for cooling raw material gas, the heavy hydrocarbon separator for separating raw material gas into liquid phase and gas phase, the heavy hydrocarbon adsorption system for further processing the gas phase, and the heat exchanger, the heavy hydrocarbon separator, the heavy hydrocarbon adsorption system are connected through the pipeline.

[0005] The heavy hydrocarbon adsorption system comprises:

[0006] The first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber are connected in parallel.

[0007] The adsorption circuit is connected to the gas phase outlet of the heavy hydrocarbon separator at one end, and is connected to the bottom air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the first branch, the second branch and the third branch respectively.

[0008] The adsorption exhaust circuit is connected to the top air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the fourth branch, the fifth branch and the sixth branch respectively.

[0009] The adsorption regeneration circuit is connected to the regeneration gas source at one end, and is connected to the top air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the seventh branch, the eighth branch and the ninth branch respectively.

[0010] The regenerative heating circuit comprises a regenerative heater, the inlets of the regenerative heater are connected with the bottom air holes of the first, second and third heavy hydrocarbon adsorbers through the tenth, eleventh and twelfth branches respectively, and the outlets of the regenerative heater are connected with the top air holes of the first, second and third heavy hydrocarbon adsorbers through the thirteenth, fourteenth and fifteenth branches respectively.

[0011] The regenerative cooling circuit comprises a regenerative cooler, one end of the regenerative cooling circuit is connected with the bottom air holes of the first, second and third heavy hydrocarbon adsorbers through the sixteenth, seventeenth and eighteenth branches respectively, and the other end of the regenerative cooling circuit is connected with the regenerative cooler, and the outlet of the regenerative cooler is connected with the regenerative gas discharge pipe.

[0012] The natural gas heavy hydrocarbon removal device of the utility model, wherein, one end of the adsorption circuit is connected with the gas phase outlet of the heavy hydrocarbon separator through a gas phase conveying pipe, the gas phase conveying pipe passes through a heat exchanger, so that the gas phase in the gas phase conveying pipe is rewarmed and then enters the adsorption circuit.

[0013] The natural gas heavy hydrocarbon removal device of the utility model, wherein, further comprising a refrigeration system, the refrigeration system comprises a refrigerant compressor and a throttle valve, the refrigerant compressor conveys refrigerant to the throttle valve through a refrigeration pipeline, the refrigerant is throttled and cooled by the throttle valve and then conveyed to a refrigerant separator through a pipeline, the gas phase outlet of the refrigerant separator is connected with the gas phase inlet of the refrigerant compressor through a reflux pipeline, the refrigerant circulates between the refrigerant compressor and the throttle valve through the refrigeration pipeline and the reflux pipeline, the refrigeration pipeline passes through a heat exchanger, the reflux pipeline passes through a heat exchanger, the refrigerant in the refrigeration pipeline is cooled in the heat exchanger, and the refrigerant in the reflux pipeline provides cold energy in the heat exchanger.

[0014] The natural gas heavy hydrocarbon removal device of the utility model has the advantages that the natural gas can be cooled by the heat exchanger, the heavy hydrocarbon substances in the gas are separated, the product with the corresponding purity is obtained, the economic value of the product is improved, and the demand of subsequent production is met. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the natural gas heavy hydrocarbon removal device of the utility model.

[0016] In the figure, 1 is raw material gas, 2 is heavy hydrocarbon, 3 is purified natural gas, 4 and 5 are regenerative gas, E1 is a heat exchanger, E2 is a regenerative heater, E3 is a regenerative cooler, V1 is a heavy hydrocarbon separator, and V2 is a refrigerant separator. DETAILED DESCRIPTION

[0017] As Figure 1As shown, the natural gas heavy hydrocarbon removal device comprises a heat exchanger E1 for cooling raw material gas 1, a heavy hydrocarbon separator V1 for separating the raw material gas into liquid phase and gas phase, and a heavy hydrocarbon adsorption system for further processing the gas phase, wherein the heat exchanger, the heavy hydrocarbon separator and the heavy hydrocarbon adsorption system are connected through pipelines.

[0018] The heavy hydrocarbon adsorption system comprises:

[0019] The first heavy hydrocarbon adsorber T1, the second heavy hydrocarbon adsorber T2 and the third heavy hydrocarbon adsorber T3 are connected in parallel.

[0020] An adsorption line is connected at one end to the gas phase outlet of the heavy hydrocarbon separator V1, and is connected at the other end to the bottom air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the first branch 11, the second branch 12 and the third branch 13 respectively.

[0021] An adsorption exhaust line is connected at one end to the top air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the fourth branch 14, the fifth branch 15 and the sixth branch 16 respectively.

[0022] An adsorption regeneration line is connected at one end to a regenerated gas source, and is connected at the other end to the top air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the seventh branch 17, the eighth branch 18 and the ninth branch 19 respectively.

[0023] A regeneration heating line comprises a regeneration heater E2, and the inlet of the regeneration heater is connected to the bottom air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the tenth branch 20, the eleventh branch 21 and the twelfth branch 22 respectively, and the outlet of the regeneration heater is connected to the top air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the thirteenth branch 23, the fourteenth branch 24 and the fifteenth branch 25 respectively.

[0024] A regeneration cooling line is connected at one end to the bottom air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the sixteenth branch 26, the seventeenth branch 27 and the eighteenth branch 28 respectively, and is connected at the other end to a regeneration cooler E3, and the outlet of the regeneration cooler is connected to a regenerated gas discharge pipe 100.

[0025] The natural gas heavy hydrocarbon removal device, wherein, one end of the adsorption line is connected with the gas phase outlet of the heavy hydrocarbon separator through a gas phase conveying pipe 101, the gas phase conveying pipe 101 passes through a heat exchanger E1, so that the gas phase in the gas phase conveying pipe is reheated and then enters the adsorption line.

[0026] The liquid phase outlet at the bottom of the heavy hydrocarbon separator is connected with a heavy hydrocarbon discharge pipe, and the heavy hydrocarbon discharge pipe passes through the heat exchanger E1, so that the heavy hydrocarbon in the heavy hydrocarbon discharge pipe provides cold energy in the heat exchanger E1.

[0027] The natural gas heavy hydrocarbon removal device, wherein, further comprises a refrigeration system, the refrigeration system comprises a refrigerant compressor C and a throttling valve 200, the refrigerant compressor delivers refrigerant to the throttling valve through a refrigeration pipe 201, the refrigerant is throttled and cooled by the throttling valve and then delivered to a refrigerant separator V2 through a pipe, the gas phase outlet of the refrigerant separator V2 is connected with the gas phase inlet of the refrigerant compressor C through a reflux pipe 202, the refrigerant circulates between the refrigerant compressor and the throttling valve through the refrigeration pipe and the reflux pipe, the refrigeration pipe passes through a heat exchanger, the reflux pipe passes through a heat exchanger, the refrigerant in the refrigeration pipe is cooled in the heat exchanger, and the refrigerant in the reflux pipe provides cold energy in the heat exchanger.

[0028] The natural gas heavy hydrocarbon removal device mainly comprises a heat exchanger, a heavy hydrocarbon separator, a refrigerant separator, a heavy hydrocarbon adsorber, valves and related pipes.

[0029] The raw material gas is natural gas or certain process gas.

[0030] The heat exchanger can be a plate-fin heat exchanger or a coil heat exchanger.

[0031] The raw material gas can be a mixture of methane, ethylene and ethane.

[0032] The refrigerant compressor C can be a reciprocating compressor, a centrifugal compressor or a screw compressor.

[0033] The raw material gas can also be a mixture of hydrogen, nitrogen and methane.

[0034] The natural gas heavy hydrocarbon removal device has the advantages that the natural gas can be cooled by the heat exchanger, the heavy hydrocarbon substances in the gas are separated, the product with corresponding purity is obtained, the economic value of the product is improved, and the demand of subsequent production is met.

[0035] The working process of the natural gas heavy hydrocarbon removal device is as follows:

[0036] The raw gas 1 enters the heat exchanger E1 to be cooled to-30 DEG C, and then enters the heavy hydrocarbon separator V1, and the gas phase enters the heat exchanger E1 to be warmed up again, and then enters the first heavy hydrocarbon adsorber T1, the second heavy hydrocarbon adsorber T2 and the third heavy hydrocarbon adsorber T3, and the liquid phase is sent to the lower section process for further treatment.

[0037] The heavy hydrocarbon adsorber removes the heavy hydrocarbon components in the natural gas through the open cycle of "adsorption-regeneration".

[0038] The regeneration gas 4 comes from outside or the cold box nitrogen-rich gas, when the first heavy hydrocarbon adsorber T1 completes the adsorption process, the second heavy hydrocarbon adsorber T2 starts to adsorb the raw gas, the regeneration gas enters the third heavy hydrocarbon adsorber T3 in the opposite direction of the raw gas for cold blowing, and then enters the regeneration heater E2 to heat the regeneration gas, and then the heated regeneration gas enters the first heavy hydrocarbon adsorber T1 for hot blowing to regenerate the adsorbent in the first heavy hydrocarbon adsorber T1, and the regeneration gas enters the cooler E3 to be cooled after leaving the zone, and the first heavy hydrocarbon adsorber T1 completes the regeneration process, and the first heavy hydrocarbon adsorber T1, the second heavy hydrocarbon adsorber T2 and the third heavy hydrocarbon adsorber T3 alternately perform the "adsorption-regeneration" process.

[0039] The propane refrigerant is compressed by the refrigerant compressor C, enters the heat exchanger E1, is cooled to-35 DEG C through the throttle valve, and then provides cold energy for the heat exchanger, and then flows back to the refrigerant compressor C to form a refrigeration cycle.

[0040] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A natural gas de-ιιevant unit characterized by, The heat exchanger for cooling raw material gas, the heavy hydrocarbon separator for separating the raw material gas into liquid phase and gas phase, and the heavy hydrocarbon adsorption system for further processing the gas phase are connected by pipelines. The heavy hydrocarbon adsorption system comprises: The first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber are connected in parallel. The adsorption line is connected at one end to the gas phase outlet of the heavy hydrocarbon separator, and is connected at the other end to the bottom air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the first branch, the second branch and the third branch respectively. The adsorption exhaust line is connected at one end to the top air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the fourth branch, the fifth branch and the sixth branch respectively. The adsorption regeneration line is connected at one end to the regenerating gas source, and is connected at the other end to the top air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the seventh branch, the eighth branch and the ninth branch respectively. The regeneration heating line comprises a regeneration heater, and the inlet of the regeneration heater is connected to the bottom air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the tenth branch, the eleventh branch and the twelfth branch respectively, and the outlet of the regeneration heater is connected to the top air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the thirteenth branch, the fourteenth branch and the fifteenth branch respectively. The regeneration cooling line is connected at one end to the bottom air holes of the first heavy hydrocarbon adsorber, the second heavy hydrocarbon adsorber and the third heavy hydrocarbon adsorber through the sixteenth branch, the seventeenth branch and the eighteenth branch respectively, and is connected at the other end to the regenerating cooler, and the outlet of the regenerating cooler is connected to the regenerating gas discharge pipe.

2. The natural gas de-liquid hydrocarbon device of claim 1, wherein, The gas phase conveying pipe is connected to the gas phase outlet of the heavy hydrocarbon separator, and passes through the heat exchanger, so that the gas phase in the gas phase conveying pipe is reheated and then enters the adsorption line.

3. The natural gas de-liquid hydrocarbon device of claim 2, wherein, The refrigeration system comprises a refrigerant compressor and a throttling valve, the refrigerant compressor is connected to the throttling valve through the refrigeration pipeline, the refrigerant is throttled and cooled by the throttling valve, and then is transported to the refrigerant separator through the pipeline, the gas phase outlet of the refrigerant separator is connected to the gas phase inlet of the refrigerant compressor through the reflux pipeline, the refrigerant circulates between the refrigerant compressor and the throttling valve through the refrigeration pipeline and the reflux pipeline, the refrigeration pipeline passes through the heat exchanger, the reflux pipeline passes through the heat exchanger, the refrigerant in the refrigeration pipeline is cooled in the heat exchanger, and the refrigerant in the reflux pipeline provides cold energy in the heat exchanger.

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