Treatment device for interstage condensate of primary normal top and vacuum top non-condensable gas compressor system

Abstract

The utility model discloses a device for treating interstage condensate of primary and normal top and vacuum top non-condensable gas compressor systems, which belongs to the technical field of treatment of interstage condensate of compressors and comprises the vacuum top non-condensable gas compressor system, the primary and normal top non-condensable gas compressor system, a primary top oil-water separator and a normal top oil-water separator. According to the utility model, two pipelines are added instead of directly discharging to the underground slop oil tank, condensate is conveyed to the primary top oil-water separator and the normal top oil-water separator for gas-liquid separation, and separated gas is conveyed to the fuel gas liquid separation tank through a pipe network, so that after the transformation is completed, the potential safety hazard of the underground slop oil tank is solved, and the safety of the underground slop oil tank is improved. Fuel is saved by recovering the gas, after two months of tracking monitoring, the alarm near the exhaust hole on the dirty oil tank ground does not give an alarm any more, no obvious gas peculiar smell exists, and the transformation effect is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of the treatment of inter-stage condensate in a compressor system, and more specifically relates to a treatment device for inter-stage condensate in an initial normal top and vacuum top non-condensable gas compressor system. Background Technique

[0002] The non-condensable gas produced by a heavy traffic asphalt unit mainly comes from the non-condensable gas in the reflux drums at the tops of the atmospheric distillation tower, the vacuum distillation tower, and the vacuum tower, and has a relatively high sulfur content. At present, it is mainly used as the combustion gas for the heating furnace, which poses a safety hazard of corrosion and leakage in the furnace inlet pipeline. At the same time, the pollutants generated by the combustion of the fuel furnace mainly include nitrogen oxides, sulfur dioxide, and dust, which are all directly discharged into the atmosphere, causing environmental pollution. To address this situation, at present, the non-condensable gas produced by the heavy traffic asphalt unit is recovered, pressurized, sent to the low-pressure gas desulfurization system for treatment, and then incorporated into the plant fuel gas pipeline network. The pressure of the non-condensable gas at the initial normal top of the heavy traffic asphalt unit is 0.03 MPa(g), and the pressure of the non-condensable gas at the vacuum top is 0.0133 MPa(g). The non-condensable gas at the initial normal top and the vacuum top is respectively pressurized to 0.9 MPa(g) by the non-condensable gas compressor at the initial normal top and the non-condensable gas compressor at the vacuum top through two stages of pressurization. After separation, a part of the gas is directly piped through the system pipe belt to the oil and gas pipeline at the top of the fractionation tower for subsequent desulfurization treatment, and a part is recycled to balance the overall pressure of the compressor system. After the non-condensable gas is compressed, the initial normal top and vacuum top non-condensable gas compressor systems will generate some condensate, and the condensate also needs to be regularly discharged to the nearby closed floor drain and transported to the underground dirty oil tank through the underground pipeline. At present, the inter-stage condensate in the initial normal top and vacuum top non-condensable gas compressor systems of domestic existing distillation units is directly discharged to the closed floor drain, discharged to the underground dirty oil tank through the buried pipeline, and pumped out of the unit by the submersible pump in the dirty oil tank to the unqualified oil pipeline.

[0003] The direct discharge of the inter-stage condensate in the initial normal top and vacuum top non-condensable gas compressor systems of the distillation unit to the underground dirty oil tank causes the accumulation and increase in the concentration of gas in the underground dirty oil tank. The alarm near the exhaust hole on the ground of the dirty oil tank will alarm at intervals, posing a safety risk; at the same time, the underground dirty oil tank transports dirty oil frequently, and there is gas and light oil in the tank, which also increases the safety risk when using the submersible pump to transport dirty oil.

[0004] Therefore, how to develop a treatment device for the inter-stage condensate in the initial normal top and vacuum top non-condensable gas compressor systems is a technical problem that those skilled in the art need to solve urgently. Content of the Utility Model

[0005] In view of this, the utility model provides a treatment device for the inter-stage condensate in the initial normal top and vacuum top non-condensable gas compressor systems.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme:

[0007] A treatment device for condensate between stages of an initial normal top and reduced top non-condensable gas compressor system, comprising a reduced top non-condensable gas compressor system, an initial normal top non-condensable gas compressor system, an initial top oil-water separator, and a normal top oil-water separator. The condensate outlets of the above-mentioned reduced top non-condensable gas compressor system and the initial normal top non-condensable gas compressor system are respectively connected to the liquid inlet of the initial top oil-water separator and the liquid inlet of the normal top oil-water separator through pipelines.

[0008] Furthermore, the above-mentioned reduced top non-condensable gas compressor system includes a first-stage intake buffer 1, a first-stage compressor 1, a first-stage exhaust buffer 1, a first-stage water cooler 1, a first-stage separator 1, a second-stage intake buffer 1, a second-stage compressor 1, a second-stage exhaust buffer tank 1, a second-stage water cooler 1, and a second-stage separator 1. The above-mentioned first-stage intake buffer 1, first-stage compressor 1, first-stage exhaust buffer 1, first-stage water cooler 1, first-stage separator 1, second-stage intake buffer 1, second-stage compressor 1, second-stage exhaust buffer tank 1, second-stage water cooler 1, and second-stage separator 1 are connected in sequence through pipelines. The liquid discharge ports at the bottom of the first-stage exhaust buffer 1, the bottom of the first-stage separator 1, the bottom of the second-stage exhaust buffer 1, and the bottom of the second-stage separator 1 are connected through pipelines and converge to the condensate outlet of the reduced top non-condensable gas compressor system. Partial non-condensable gas return pipelines are respectively provided at the non-condensable gas outlets of the first-stage separator 1 and the second-stage separator 1 and connected to the non-condensable gas inlets of the first-stage intake buffer 1;

[0009] The above-mentioned initial normal top non-condensable gas compressor system includes a first-stage intake buffer 2, a first-stage compressor 2, a first-stage exhaust buffer 2, a first-stage water cooler 2, a first-stage separator 2, a second-stage intake buffer 2, a second-stage compressor 2, a second-stage exhaust buffer tank 2, a second-stage water cooler 2, and a second-stage separator 2. The above-mentioned first-stage intake buffer 2, first-stage compressor 2, first-stage exhaust buffer 2, first-stage water cooler 2, first-stage separator 2, second-stage intake buffer 2, second-stage compressor 2, second-stage exhaust buffer tank 2, second-stage water cooler 2, and second-stage separator 2 are connected in sequence through pipelines. The liquid discharge ports at the bottom of the first-stage exhaust buffer 2, the bottom of the first-stage separator 2, the bottom of the second-stage exhaust buffer 2, and the bottom of the second-stage separator 2 are connected through pipelines and converge to the condensate outlet of the initial normal top non-condensable gas compressor system. Partial non-condensable gas return pipelines are respectively provided at the non-condensable gas outlets of the first-stage separator 2 and the second-stage separator 2 and connected to the non-condensable gas inlets of the first-stage intake buffer 2.

[0010] Furthermore, a valve 1 is provided at the pipeline near the condensate outlet of the above-mentioned reduced top non-condensable gas compressor system, a valve 2 is provided at the pipeline near the condensate outlet of the above-mentioned initial normal top non-condensable gas compressor system, a valve 3 is provided at the pipeline near the liquid inlet of the above-mentioned initial top oil-water separator, and a valve 4 is provided at the pipeline near the liquid inlet of the above-mentioned normal top oil-water separator.

[0011] Further, it also includes a first fuel gas liquid separation tank and a second fuel gas liquid separation tank. The gas outlet of the above-mentioned primary overhead oil-water separator is connected to the first fuel gas liquid separation tank through a pipeline, and the gas outlet of the above-mentioned normal overhead oil-water separator is connected to the second fuel gas liquid separation tank through a pipeline.

[0012] Advantages of the present utility model: The technical problem to be solved by the present utility model is to change the transportation process of the inter-stage condensate of the primary and normal overhead, and reduced-top non-condensable gas compressor systems. The direct discharge to the underground waste oil tank is changed to add two new pipelines, and the condensate is sent to the primary overhead oil-water separator and the normal overhead oil-water separator for gas-liquid separation. The separated gas is sent to the fuel gas liquid separation tank through the pipeline network, and after further purification, it enters the combustion furnace as fuel gas. After the transformation, not only the safety hazards of the underground waste oil tank are solved, but also fuel is saved by recycling the gas. After two months of tracking and monitoring, the alarm near the exhaust hole on the ground of the waste oil tank no longer alarms, and there is no obvious odor of gas, and the transformation effect is good. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the device for treating the inter-stage condensate of the primary and normal overhead, and reduced-top non-condensable gas compressor systems of the present utility model;

[0014] Figure 2 It is a schematic structural diagram of the specific structure of the system for treating the inter-stage condensate of the primary and normal overhead, and reduced-top non-condensable gas compressor of the present utility model;

[0015] Among them, 1 - reduced-top non-condensable gas compressor system, 2 - primary and normal overhead non-condensable gas compressor system, 3 - primary overhead oil-water separator, 4 - normal overhead oil-water separator, 5 - valve one, 6 - valve two, 7 - valve three, 8 - valve four, 10 - first-stage intake buffer one, 11 - first-stage compressor one, 12 - first-stage exhaust buffer one, 13 - first-stage water cooler one, 14 - first-stage separator one, 15 - second-stage intake buffer one, 16 - second-stage compressor one, 17 - second-stage exhaust buffer tank one, 18 - second-stage water cooler one, 19 - second-stage separator one, 20 - first-stage intake buffer two, 21 - first-stage compressor two, 22 - first-stage exhaust buffer two, 23 - first-stage water cooler two, 24 - first-stage separator two, 25 - second-stage intake buffer two, 26 - second-stage compressor two, 27 - second-stage exhaust buffer tank two, 28 - second-stage water cooler two, 29 - second-stage separator two, 31 - first fuel gas liquid separation tank, 32 - second fuel gas liquid separation tank. Detailed Embodiment

[0016] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0017] As shown Figure 1-2 in the figure, a treatment device for inter-stage condensate of the non-condensable gas compressor system at the primary normal top and reduced pressure top includes a non-condensable gas compressor system 1 at the reduced pressure top, a non-condensable gas compressor system 2 at the primary normal top, a primary top oil-water separator 3, and a normal top oil-water separator 4. The condensate outlets of the non-condensable gas compressor system 1 at the reduced pressure top and the non-condensable gas compressor system 2 at the primary normal top are respectively connected to the liquid inlet of the primary top oil-water separator 3 and the liquid inlet of the normal top oil-water separator 4 through pipelines.

[0018] In one embodiment, the non-condensable gas compressor system 1 at the reduced pressure top includes a first-stage inlet buffer 10, a first-stage compressor 11, a first-stage exhaust buffer 12, a first-stage water cooler 13, a first-stage separator 14, a second-stage inlet buffer 15, a second-stage compressor 16, a second-stage exhaust buffer tank 17, a second-stage water cooler 18, and a second-stage separator 19. The first-stage inlet buffer 10, the first-stage compressor 11, the first-stage exhaust buffer 12, the first-stage water cooler 13, the first-stage separator 14, the second-stage inlet buffer 15, the second-stage compressor 16, the second-stage exhaust buffer tank 17, the second-stage water cooler 18, and the second-stage separator 19 are connected in sequence through pipelines. The drain ports at the bottom of the first-stage exhaust buffer 12, the drain port at the bottom of the first-stage separator 14, the drain port at the bottom of the second-stage exhaust buffer, and the drain port at the bottom of the second-stage separator 19 are connected through pipelines and converge to the condensate outlet of the non-condensable gas compressor system 1 at the reduced pressure top. The non-condensable gas outlets of the first-stage separator 14 and the second-stage separator 19 are respectively provided with partial non-condensable gas return pipelines connected to the non-condensable gas inlet of the first-stage inlet buffer 10;

[0019] The non-condensable gas compressor system 2 at the primary normal top includes a first-stage inlet buffer 20, a first-stage compressor 21, a first-stage exhaust buffer 22, a first-stage water cooler 23, a first-stage separator 24, a second-stage inlet buffer 25, a second-stage compressor 26, a second-stage exhaust buffer tank 27, a second-stage water cooler 28, and a second-stage separator 29. The first-stage inlet buffer 20, the first-stage compressor 21, the first-stage exhaust buffer 22, the first-stage water cooler 23, the first-stage separator 24, the second-stage inlet buffer 25, the second-stage compressor 26, the second-stage exhaust buffer tank 27, the second-stage water cooler 28, and the second-stage separator 29 are connected in sequence through pipelines. The drain ports at the bottom of the first-stage exhaust buffer 22, the drain port at the bottom of the first-stage separator 24, the drain port at the bottom of the second-stage exhaust buffer, and the drain port at the bottom of the second-stage separator 29 are connected through pipelines and converge to the condensate outlet of the non-condensable gas compressor system 2 at the primary normal top. The non-condensable gas outlets of the first-stage separator 24 and the second-stage separator 29 are respectively provided with partial non-condensable gas return pipelines connected to the non-condensable gas inlet of the first-stage inlet buffer 20.

[0020] In one embodiment, a valve one 5 is provided at the pipeline near the condensate outlet of the vacuum overhead non-condensable gas compressor system 1, a valve two 6 is provided at the pipeline near the condensate outlet of the atmospheric and vacuum overhead non-condensable gas compressor system 2, a valve three 7 is provided at the pipeline near the liquid inlet of the atmospheric overhead oil-water separator 3, and a valve four 8 is provided at the pipeline near the liquid inlet of the vacuum overhead oil-water separator 4.

[0021] In one embodiment, it further includes a fuel gas knockout drum one 31 and a fuel gas knockout drum two 32. The gas outlet of the atmospheric overhead oil-water separator 3 is communicated with the fuel gas knockout drum one 31 through a pipeline, and the gas outlet of the vacuum overhead oil-water separator 4 is communicated with the fuel gas knockout drum two 32 through a pipeline.

[0022] In one embodiment, the first-stage compressor one 11, the second-stage compressor one 16, the first-stage compressor two 21, and the second-stage compressor two 26 are reciprocating compressors.

[0023] Working principle: The non-condensable gas entering from the reflux drum at the top of the vacuum tower enters the vacuum overhead non-condensable gas compressor system 1, passes through the first-stage inlet buffer one 10 and enters the first-stage compressor one 11 for pressurization, and then enters the first-stage exhaust buffer one 12. The temperature of the pressurized non-condensable gas rises accordingly. After being cooled by the first-stage water cooler one 13, it enters the first-stage separator one 14 in a gas-liquid mixed form for gas-liquid separation. The separated gas enters the second-stage inlet buffer one 15, is pressurized by the second-stage compressor one 16 and then enters the second-stage exhaust buffer one. A small part flows back to the first-stage inlet buffer one 10 to adjust the pressure of the whole system. The temperature of the pressurized non-condensable gas rises accordingly. After being cooled by the second-stage water cooler one 18, it enters the second-stage separator one 19 in a gas-liquid mixed form for gas-liquid separation. That is, the pressurized non-condensable gas is discharged from the top of the second-stage separator one 19 and sent to the overhead oil and gas pipeline of the subsequent low-pressure gas desulfurization system for subsequent desulfurization treatment. A part flows back to the first-stage inlet buffer one 10 to adjust the pressure of the whole system. There are four places where the vacuum overhead non-condensable gas compressor system 1 generates condensate, namely the drain port at the bottom of the first-stage exhaust buffer one 12, the drain port at the bottom of the first-stage separator one 14, the drain port at the bottom of the second-stage exhaust buffer one, and the drain port at the bottom of the second-stage separator one 19. The condensate from these four parts is collected through pipelines and sent to the atmospheric overhead oil-water separator 3 and the vacuum overhead oil-water separator 4 for gas-liquid separation. The separated gas is sent to the subsequent fuel gas knockout drum one 31 through the pipeline network, and after further purification, it enters the fuel gas pipeline network as fuel gas.

[0024] The non-condensable gas entering from the debutanizer and the overhead reflux drum of the atmospheric column enters the debutanizer and atmospheric column overhead non-condensable gas compressor system 2. It enters the first-stage compressor 21 for pressurization through the first-stage intake buffer 20, and then enters the first-stage discharge buffer 22. The temperature of the pressurized non-condensable gas rises accordingly. After being cooled by the first-stage water cooler 23, it enters the first-stage separator 24 in a gas-liquid mixture form for gas-liquid separation. The separated gas enters the second-stage intake buffer 25, is pressurized by the second-stage compressor 26, and then enters the second-stage discharge buffer. A small part of it is refluxed to the first-stage intake buffer 20 to adjust the pressure of the entire system. The temperature of the pressurized non-condensable gas rises accordingly. After being cooled by the second-stage water cooler 28, it enters the second-stage separator 29 in a gas-liquid mixture form for gas-liquid separation. That is, the pressurized non-condensable gas is discharged from the top of the second-stage separator 29 and sent to the subsequent light ends gas desulfurization system's fractionation tower top oil and gas pipeline for subsequent desulfurization treatment. A part of it is refluxed to the first-stage intake buffer 20 to adjust the pressure of the entire system. There are four places where condensate is generated in the debutanizer and atmospheric column overhead non-condensable gas compressor system 2, namely the drain opening at the bottom of the first-stage discharge buffer 22, the drain opening at the bottom of the first-stage separator 24, the drain opening at the bottom of the second-stage discharge buffer, and the drain opening at the bottom of the second-stage separator 29. The condensate from these four parts is collected through pipelines and sent to the debutanizer top oil-water separator 3 and the atmospheric column top oil-water separator 4 for gas-liquid separation. The separated gas is sent to the subsequent fuel gas knockout drum 32 through the pipeline network, and after further purification, it enters the fuel gas pipeline network as fuel gas.

[0025] The description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A processing device for condensate between stages of an initial normal top and reduced top non-condensable gas compressor system, characterized in that, It includes a vacuum overhead non-condensable gas compressor system, a primary and atmospheric overhead non-condensable gas compressor system, a primary overhead oil-water separator, and an atmospheric overhead oil-water separator. The condensate outlets of the vacuum overhead non-condensable gas compressor system and the primary and atmospheric overhead non-condensable gas compressor system are respectively connected to the liquid inlets of the primary overhead oil-water separator and the atmospheric overhead oil-water separator through pipelines.

2. The treatment device for the inter-stage condensate of the primary and normal top and reduced top non-condensable gas compressor system according to claim 1, characterized in that The vacuum overhead non-condensable gas compressor system includes a first-stage inlet buffer tank 1, a first-stage compressor 1, a first-stage exhaust buffer tank 1, a first-stage water cooler 1, a first-stage separator 1, a second-stage inlet buffer tank 1, a second-stage compressor 1, a second-stage exhaust buffer tank 1, a second-stage water cooler 1, and a second-stage separator 1. The first-stage inlet buffer tank 1, the first-stage compressor 1, the first-stage exhaust buffer tank 1, the first-stage water cooler 1, the first-stage separator 1, the second-stage inlet buffer tank 1, the second-stage compressor 1, the second-stage exhaust buffer tank 1, the second-stage water cooler 1, and the second-stage separator 1 are connected in sequence through pipelines. The liquid discharge ports at the bottoms of the first-stage exhaust buffer tank 1, the first-stage separator 1, the second-stage exhaust buffer tank 1, and the second-stage separator 1 are connected through pipelines and converge to the condensate outlet of the vacuum overhead non-condensable gas compressor system. Partial non-condensable gas return pipelines are respectively provided at the non-condensable gas outlets of the first-stage separator 1 and the second-stage separator 1 and connected to the non-condensable gas inlets of the first-stage inlet buffer tank 1. The primary and atmospheric overhead non-condensable gas compressor system includes a first-stage inlet buffer tank 2, a first-stage compressor 2, a first-stage exhaust buffer tank 2, a first-stage water cooler 2, a first-stage separator 2, a second-stage inlet buffer tank 2, a second-stage compressor 2, a second-stage exhaust buffer tank 2, a second-stage water cooler 2, and a second-stage separator 2. The first-stage inlet buffer tank 2, the first-stage compressor 2, the first-stage exhaust buffer tank 2, the first-stage water cooler 2, the first-stage separator 2, the second-stage inlet buffer tank 2, the second-stage compressor 2, the second-stage exhaust buffer tank 2, the second-stage water cooler 2, and the second-stage separator 2 are connected in sequence through pipelines. The liquid discharge ports at the bottoms of the first-stage exhaust buffer tank 2, the first-stage separator 2, the second-stage exhaust buffer tank 2, and the second-stage separator 2 are connected through pipelines and converge to the condensate outlet of the primary and atmospheric overhead non-condensable gas compressor system. Partial non-condensable gas return pipelines are respectively provided at the non-condensable gas outlets of the first-stage separator 2 and the second-stage separator 2 and connected to the non-condensable gas inlets of the first-stage inlet buffer tank 2.

3. The treatment device for condensate between stages of a primary normal top and reduced top non-condensable gas compressor system according to claim 1, characterized in that, A valve 1 is provided at the pipeline near the condensate outlet of the vacuum overhead non-condensable gas compressor system, a valve 2 is provided at the pipeline near the condensate outlet of the primary and atmospheric overhead non-condensable gas compressor system, a valve 3 is provided at the pipeline near the liquid inlet of the primary overhead oil-water separator, and a valve 4 is provided at the pipeline near the liquid inlet of the atmospheric overhead oil-water separator.

4. The processing device for condensate between stages of the primary and normal top and reduced top non-condensable gas compressor system according to claim 1, characterized in that, It further includes a fuel gas knockout drum 1 and a fuel gas knockout drum 2. The gas outlet of the primary overhead oil-water separator is communicated with the fuel gas knockout drum 1 through a pipeline, and the gas outlet of the atmospheric overhead oil-water separator is communicated with the fuel gas knockout drum 2 through a pipeline.

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