KR20200101790A - Gas processing apparatus and method - Google Patents

Abstract

Disclosed is a gas treatment apparatus including: a compression unit for increasing the pressure of introduced gas; a cooling unit including a main cooling unit for lowering the temperature of the gas through heat exchange with the introduced gas whose pressure is increased by the compression unit and a precooling unit for cooling a refrigerant and providing the refrigerant to the main cooling unit; and a fluid circulation unit that mixes at least a part of one of extracted extracts formed by cooling the introduced gas by the main cooling unit with the introduced gas and cools the heated compression unit by re-introducing a mixture into the compression unit.

Description

Gas processing device and gas processing method {GAS PROCESSING APPARATUS AND METHOD}

The present invention relates to a gas treatment apparatus and a gas treatment method.

As the bio-industry is increasing, the development of technology for recycling methods such as organic waste is being emphasized. In organic waste generated from livestock sites, gases may be generated during the oxidation process of the waste. Methane occupies a significant portion of the gas generated, and methane can be liquefied and reused as fuel such as LNG. In the process of exposing methane to a high-pressure and low-temperature environment for reuse as fuel, the temperature of the compressor may increase gradually.

In such a system, the cooling of the compressor allows it to function stably even when the facility is operated for a longer period of time. Therefore, a cooling device or a refrigerant required for cooling must be provided for the cooling, and in order to continuously supply the refrigerant, the nitrogen refrigerant is required to be replaced every predetermined period, and for this purpose, the operation of the facility may be stopped and cost may occur. Accordingly, there is a need for a gas treatment apparatus with improved cooling efficiency and convenience of supplying to the inside.

Republic of Korea Patent Publication No. 1995-0031938 (1995. 12. 20)

An object of the present invention is to provide a gas treatment apparatus that extracts by satisfying different liquefaction points of components contained in an inlet gas and uses one of the extracted components as a cooling material.

An object of the present invention is to provide a gas treatment apparatus capable of forming respective liquefaction points by connecting a plurality of refrigeration cycles to satisfy different liquefaction points of components contained in an inlet gas.

An object of the present invention is to provide a gas treatment apparatus in which a component for extraction and a refrigerant used for extraction are the same component among specific components contained in a gas.

A compression unit that increases the pressure of the inlet gas; A cooling unit including a main cooling unit for lowering a temperature of the gas through heat exchange with the inlet gas whose pressure is increased by the compression unit, and a precooling unit for cooling the refrigerant and providing the main cooling unit; And a fluid circulation unit for cooling the compressed unit heated by mixing at least a part of one of the extracts extracted by cooling the inlet gas by the main cooling unit with the inlet gas and then re-introducing it to the compression unit. .

In addition, the extract mixed with the incoming gas may be the same material as the refrigerant.

In addition, the main cooling unit may include a first cooling unit, a second cooling unit, and a third cooling unit for cooling to a temperature at which a plurality of extracts can be extracted.

In addition, the extract may contain sulfur, carbon dioxide and methane.

In addition, it may further include a cooling unit for cooling the compression unit.

In addition, the fluid circulation unit may cool the compression unit by repeatedly providing and recovering oil to the compression unit.

In addition, the refrigerant whose temperature has increased due to heat exchange with the inlet gas may be transferred to the precooling unit to be delivered after recooling.

The inlet gas is introduced into the compression unit, the pressure of the inlet gas is increased by compression by the compression unit, and the inlet gas in an increased pressure state is transferred to the cooling unit to extract the first extract at a first temperature, and is higher than the first temperature. The second extract is extracted at a lower second temperature, and a third extract is extracted at a third temperature lower than the second temperature, and a part of the third extract is mixed with the inlet gas by the fluid circulation unit and re-introduced into the compression unit. There is provided a method of driving a gas processing apparatus in which the temperature is lowered.

An embodiment of the present invention can provide a gas treatment apparatus that extracts by satisfying different liquefaction points of components contained in an inlet gas, and uses one of the extracted components as a cooling material.

An embodiment of the present invention may provide a gas processing apparatus capable of forming respective liquefaction points by connecting a plurality of refrigeration cycles in order to satisfy different liquefaction points of components contained in an inlet gas.

An embodiment of the present invention may provide a gas processing apparatus in which a component for extraction and a refrigerant used for extraction are the same component among specific components contained in a gas.

1 is a view of a gas treatment apparatus according to an embodiment of the present invention,
2 is a view showing a fluid flow connected to a compression unit according to an embodiment of the present invention;
3 is a view showing a connection relationship between a pre-cooling unit and a main cooling unit according to an embodiment of the present invention;
4 is a view showing a sequence in which the gas treatment apparatus according to an embodiment of the present invention processes an incoming gas.

Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings. However, this is only an example and the present invention is not limited thereto.

In describing the present invention, when it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention and may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification.

The technical idea of the present invention is determined by the claims, and the following embodiments are only one means for efficiently describing the technical idea of the present invention to those of ordinary skill in the art.

Hereinafter, a gas processing device and a process of processing gas through the gas processing device will be described. The processing includes separately extracting the gas to be treated for each component, and as an embodiment of the present invention, extraction of high purity methane from the inlet gas will be described later. In addition, the inlet gas may be caused by anaerobic digestion of organic matter such as food waste, livestock manure, and biomass, and may be for extracting methane, which is a biogas obtained from the inlet gas.

1 is a view of a gas treatment apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the gas treatment apparatus may include a compression unit 300, a cooling unit and a fluid circulation unit 10. In order to liquefy the incoming gas for each component and extract it separately, it is advantageous to expose it to a low temperature state corresponding to the component to be extracted step by step. In addition, since gas is easily liquefied in a high-pressure and low-temperature state, it is advantageous to form a high-pressure and low-temperature state, and thus, a high-pressure environment is created for the compression unit 300, and a low-temperature environment is created for the cooling unit to expose the inlet gas. The extract can be extracted. In addition, the fluid circulation unit 10 may supply at least a part of the extracted extract through a path through which the inlet gas is introduced to be mixed. The mixing reduces the temperature of the gas flowing into the compression unit 300, thereby mitigating the increase in the internal temperature of the compression unit 300 according to the temperature generated in the process of compressing the incoming gas by the compression unit 300 (cooling). To be able to.

Specifically, the gas treatment apparatus according to an embodiment of the present invention extracts the extract by cooling the inlet gas in a high-pressure state by the compression unit 300, which compresses the inflow gas at least once to form a high-pressure state. A fluid circulation unit 10 for providing at least a portion of one of the cooling unit and the extracted extract to be mixed with the inlet gas flowing into the compression unit 300 may be included.

On the other hand, when the inlet gas is due to the anaerobic digestion described above, and the gas at room temperature in the atmosphere, the path provided to the compression unit 300 is referred to as a first gas path F1. After the first gas path (F1), the path compressed by the compression unit 300 and transferred to the main cooling unit 200 as gas (inflow gas) in a high pressure state is referred to as the second gas path (F2), and the main cooling unit The path cooled by 200 and transferred to the fluid circulation unit 10 is referred to as a third gas path F3. In addition, a path through which the inlet gas newly introduced on the first gas path F1 by the fluid circulation unit 10 and the gas delivered from the fluid circulation unit 10 are mixed is referred to as a fourth gas path F4. It is called. That is, by transferring the gas through the fourth gas path F4, at least part of the extract, which is part of the incoming gas, is re-introduced into the first gas path F1.

Therefore, in the case of the first gas path (F1), only inflow gas (as described above, due to anaerobic digestion, gas at room temperature in the atmosphere) may exist initially, but the extract is extracted after a certain process proceeds. In other words, the gas (at least a portion of the extract) that has passed through the main cooling unit 200 may be mixed with the inlet gas via the fluid circulation unit 10 and provided to the compression unit 300.

As described above, the re-inflowed gas may promote cooling of the compression unit 300. In addition, cooling of the compression unit 300 may be performed by providing a separate cooling device. For example, it may be a gas processing apparatus further including a cooling unit 20. For example, when a cooling unit 20 using water as a refrigerant is further included, a first coolant path W1 and a compression unit 300 for cooling water as a refrigerant in a closed loop and delivering it to the compression unit 300 ) May be cooled and a second coolant path W2 transmitted to the cooling unit 20 for cooling the water of the elevated temperature may be formed.

In addition, cooling of the compression unit 300 may be performed through oil. For example, a path for cooling oil, which is a refrigerant in a closed loop, and delivering it to the compression unit 300, to the fluid circulation unit 10 to cool the compression unit 300 and cool the oil at an elevated temperature again. There may be a path of delivery. Here, the refrigerant provided for cooling the oil in the fluid circulation unit 10 may be a part of the extract delivered through the third gas path F3. The extract may be transferred at, for example, a sub-zero temperature, and may reduce the temperature of the oil by indirectly exchanging heat with the oil heated through the compression unit 300.

The means for cooling the compression unit 300 described above includes gas, water, and oil. Here, since the gas is a material to be compressed, the inside of the compression unit 300 can be cooled, and water and oil can be heated by driving the compression unit 300 and cool the outside of the compression unit 300. have.

On the other hand, the main cooling unit 200 performing heat exchange to lower the temperature of the incoming gas can cool the incoming gas step by step by performing additional cooling through the refrigerant that has been primarily cooled by the precooling unit 100. have. That is, the cooling unit performs primary cooling in the precooling unit 100 and performs heat exchange with the gas in the first refrigerant path G1 and the main cooling unit 200 to deliver the refrigerant to the main cooling unit 200. A second refrigerant path G2 through which the refrigerant is transferred back to the precooling unit 100 may be formed in order to recool the refrigerant heated through the refrigerant.

Here, the first refrigerant path G1 through which the refrigerant is delivered to the main cooling unit 200 encompasses the transmission to the components within the plurality of main cooling units 200 for stepwise cooling. Specifically, the first refrigerant path G1 will be described in detail with reference to FIG. 3 below.

2 is a view showing the flow of fluids (water, oil, and gas) connected to the compression unit 300 according to an embodiment of the present invention.

Referring to FIG. 2, a cooling mechanism of the compression unit 300 may be described in detail. Here, the compression unit 300 may increase the pressure to a required level to perform liquefaction of the inlet gas. In order to increase the pressure, the incoming gas passes through the compressor 101 in stages, and the pressure may be gradually increased. As shown in FIG. 2, the compression unit 300 may include four compressors 101 and three low temperature units positioned between each compressor 101. And, as described above, the refrigerant cooling the compression unit 300 may be gas, water, and oil. The gas, water, and oil may be provided to the compressor 101 or a low-temperature unit to mitigate an increase in temperature due to an increase in pressure of the incoming gas.

First, when the gas in the refrigerant is described, gas (some of the extracts) as a refrigerant may be introduced along the first gas path F1 when the inlet gas is introduced into the first compressor 301. At this time, the gas as the refrigerant introduced into the first compressor 301 may be liquefied and extracted, and may be in a low temperature state up to minus 100 degrees Celsius. Accordingly, since the gas extracted as the refrigerant in the cryogenic state (less than -100 degrees Celsius) is mixed with the inflow gas through the fluid circulation unit 10, a low initial compression temperature may be formed. Thus, overheating due to compression can be prevented.

Subsequently, the inlet gas may be repeatedly compressed in order to pass through the four compressors 101, but since the temperature of the gas flowing into the first compressor 301 is lowered to the cryogenic level, the pressure is compared after 4 times of compression. It can exist in the form of a low-temperature gas.

The low-temperature gas, which is a refrigerant, exists in the form of a gas having a low temperature compared to the pressure (atmospheric pressure and room temperature), and also prevents overheating of the compressor 101, and then in the main cooling part 200 to be transmitted through the second gas path F2. It can also help to increase the cooling efficiency of The cooling of the compressor 101 can directly reduce the temperature of the inside of the compressor 101, that is, the inner surface space forming the compression space.

In the case of water among the refrigerants, the compressor 101 or the low temperature unit may be cooled by the cooling unit 20. As described above, four compressors 101 and three low-temperature units positioned between each compressor 101 are located. The cooling unit 20 may supply cooled water to the compressor 101 or the low temperature unit to cool the compressor 101 or the low temperature unit. In this example, the cooling unit 20 as a means for cooling the low temperature unit will be described.

The cooling unit 20 may cool water (cooling water) through the heat exchange unit 21 and provide water to the low temperature unit by power of the pump 22. Here, a first low temperature part 310, a second low temperature part 320, and a third low temperature part 330 are provided in the low temperature part, and cooling water may be provided to each low temperature part. In the case of each low-temperature section, it is a section that is located between the compressors 101 and is provided to reduce the increased temperature as the pressure increases in the compressor 101, and is a section that can be formed for cooling purposes.

Therefore, the low temperature part is located between the compressor 101 in which the pressure is increased step by step, the first low temperature part 310 is located in the section in which the gas is moved from the first compressor 301 to the second compressor 302, and the second The second low temperature unit 320 is located in the section where the gas is moved from the compressor 302 to the third compressor 303, and the third is in the section where the gas is moved from the third compressor 303 to the fourth compressor 304. The low temperature part 330 is located. Since the moving direction of the inflow gas is moved to the second gas path F2 after the first gas path F1, the first low temperature part 310 may have the lowest temperature and the third low temperature part 330 may be the highest.

Therefore, the cooling unit 20 is at least one of the first low temperature unit 310, the second low temperature unit 320, and the third low temperature unit 330 according to the cooling capacity of the heat exchange unit 21. It is provided to be connected, but the temperature difference with water (cooling water) is large, and the cooling efficiency may be provided from the side. That is, the third low-temperature unit 330, the second low-temperature unit 320, and the first low-temperature unit 310 may be connected in this order. However, it is not limited thereto, and may be arranged differently according to the intention of a person skilled in the art.

In addition, in the case of oil among the refrigerants, as in the case of water (cooling water), it is repeatedly circulated on a peruffe, thereby cooling the compressor 101. The oil may be circulated between the compressor 101 and the fluid circulation unit 10 by the fluid circulation unit 10. The oil is cooled in the fluid circulation unit 10, and the cooled oil may be delivered to the first compressor 301, the second compressor 302, the third compressor 303, and the fourth compressor 304. Heat generated by the compressor 101 during the compression process may be generated inside and outside the compressor 101, and may cool both the superheated parts inside and outside the compression space. The overheating part may be overheating due to the operation of the machine (compressor 101). The first compressor 301, the second compressor 302, the third compressor 303, and the fourth compressor 304 are cooled, and the oil recovered to the fluid circulation unit 10 may be cooled.

In the cooling, a part of the extract extracted by cooling in the main cooling unit 200 is provided to the fluid circulation unit 10 through the third gas path F3, so that the oil may be cooled through heat exchange with each other. The heat exchange is indirect heat exchange and does not mean that they are directly mixed. The extract, which has undergone heat exchange with oil, is transferred to the first gas path F1 through the fourth gas path F4, and may be mixed directly with the incoming gas.

Meanwhile, the material passing through the third gas path F3 and the fourth gas path F4 described above is the same material, and may be, for example, methane. The extract may be liquefied and extracted in stages through the main cooling unit 200, and may be, for example, sulfur, carbon dioxide, methane, or the like. This example will be described in detail with reference to FIG. 3.

Hereinafter, it will be described that the extract is extracted during the stepwise cooling of the incoming gas in the main cooling unit 200. Steps are divided into three steps, cooling is performed, and extracts are generated for each step. The extract extracted in each step may be a first extract (1), a second extract (2), and a third extract (3). Hereinafter, the first extract (1) is used as sulfur, and the second extract (2) is used. Carbon dioxide and the third extract (3) will be described by exemplifying methane.

3 is a diagram showing a connection relationship between the precooling unit 100 and the main cooling unit 200 according to an embodiment of the present invention.

Referring to FIG. 3, the cooling unit includes a precooling unit 100 and a main cooling unit 200. The precooling unit 100 performs a function of primarily cooling the refrigerant to be transferred to the main cooling unit 200, and the main cooling unit 200 receiving the cooled refrigerant through the first refrigerant path G1 is compressed. The inlet gas introduced into the main cooling unit 200 may be cooled through the second gas path F2 via the unit 300. The main cooling unit 200 may liquefy and extract the extract liquefied at a specific cooling temperature by cooling the incoming gas.

The precooling unit 100 includes a compressor 101, a condenser 102, a receiver 103 and an evaporator 104, and when the refrigerant passing through the evaporator 104 is cooled, the main cooling unit 200 It is transmitted through the first refrigerant path (G1). The refrigerant whose temperature has risen in the main cooling unit 200 is recovered by the compressor 101 of the precooling unit 100, cooled while passing through the evaporator 104, and supplied to the main cooling unit 200 again.

On the other hand, when the inlet gas contains sulfur (about 5%), carbon dioxide (35%), methane (about 60%), etc. as described above, only methane that has been liquefied and liquefied to extract only high purity methane is extracted. I can. However, during cooling, the liquefaction points of sulfur and carbon dioxide (sulfur: about-85 degrees, carbon dioxide, about-130 degrees, methane: about-172 degrees) are reached more quickly, so sulfur and carbon dioxide are liquefied and extracted, and methane is liquefied. The process can be carried out.

Therefore, stepwise cooling requires the step of exposing the incoming gas to each liquefaction point. In order to satisfy the above requirements, the main cooling unit 200 according to an embodiment of the present invention may include a first cooling unit 210, a second cooling unit 220, and a third cooling unit 230. The first cooling unit 210 creates an environment of -85 degrees to liquefy sulfur after heat exchange with the inlet gas and extracts it from the inlet gas, and the second cooling unit 220 creates an environment of -130 degrees to extract sulfur. Liquefied carbon dioxide can be extracted from the incoming gas. In addition, the third cooling unit 230 may create an environment of -172 degrees and extract methane by liquefying methane from the inlet gas from which sulfur and carbon dioxide are extracted.

In order to create a staged cooling environment, the main cooling unit 200 may recool the refrigerant delivered from the precooling unit 100. Since the recooling is repeated as the steps are repeated, the temperature of the refrigerant may be further lowered. When described based on the movement path of the refrigerant, the refrigerant cooled by the precooling unit 100 and transferred through the first refrigerant path G1 may be transferred to the main cooling unit 200. Here, the first refrigerant path G1 is a comprehensive definition of the path of the refrigerant transferred from the precooling unit 100 to the main cooling unit 200, and specifically, it is removed from the evaporator 104 of the precooling unit 100. 1 The path through which the refrigerant is transferred to the first receiver 214 of the cooling unit 210 is referred to as the 1-1 refrigerant path (G1-1), and from the first unit 211 of the first cooling unit 210 A path through which the refrigerant is transferred to the second receiver 224 of the second cooling unit 220 is referred to as a 1-2 refrigerant path G1-2. In addition, the refrigerant is transferred from the second unit 221 of the second cooling unit 220 to the third receiver 234 of the third cooling unit 230 as a third refrigerant path (G1-3). It is called.

Here, the first unit 211, the second unit 221, and the third unit 231 receive the refrigerant from the first receiver 214, the second receiver 224, and the third receiver 234, respectively. It is a unit that receives and transfers at least a part of the refrigerant delivered to the heat exchange unit 21 (the first heat exchange unit 212, the second heat exchange unit 222, and the third heat exchange unit 232) for heat exchange.

Specifically, the refrigerant circulation path is cooled in the precooling unit 100 and transferred to the first receiver 214 of the first cooling unit 210, and the refrigerant accommodated in the first receiver 214 is an evaporator ( 104) It may be transferred to the first unit 211 by opening and closing the valve. Part of the refrigerant delivered to the first unit 211 is supplied to the first heat exchange unit 212 by the first pump 213, and the other part is the second receiver 224 of the second cooling unit 220 Is delivered to. Some of the refrigerants supplied to the first heat exchange unit 212 perform primary heat exchange with the inlet gas delivered to the main cooling unit 200 through the second gas path F2. Primary heat exchange here means that the incoming gas reaches -85 degrees.

The refrigerant whose temperature is increased through heat exchange in the first heat exchange unit 212 may be recovered to the first unit 211 and moved to the precooling unit 100 along the second refrigerant path G2. Here, the second refrigerant path G2 is a 2-1 refrigerant path G2-1 through which the refrigerant moves from the first unit 211 to the compressor 101 of the precooling unit 100, and the refrigerant is the second unit ( The 2-2 refrigerant path G2-2 and the refrigerant moved from 221 to the compressor 101 of the precooling unit 100 from the third unit 231 to the compressor 101 of the precooling unit 100 It includes a moving 2-3 refrigerant path (G2-3).

In addition, the second gas path (F2) is specifically the second gas path (F2-1) connected to the first heat exchange unit 212 from the fourth compressor (304), the first heat exchange unit (212). 2 The 2-2 gas path (F2-2) connected to the heat exchange part 222 and the 2-3 gas path (F2-3) connected to the third heat exchange part 232 from the second heat exchange part 222 It can be classified as

The refrigerant transferred from the first unit 211 as the remaining refrigerant to the second receiver 224 may be transferred to the second unit 221 by opening and closing a valve of the evaporator 104. The refrigerant delivered to the second unit 221 is partially supplied to the second heat exchange unit 222 by the second pump 223, and the remaining portion is the third receiver 234 of the third cooling unit 230 ). The refrigerant supplied to the second heat exchange unit 222 undergoes secondary heat exchange in the second heat exchange unit 222 from the inlet gas extracted from sulfur in the first heat exchange unit 212. Here, secondary heat exchange means that the incoming gas reaches -130 degrees. The refrigerant whose temperature is increased through heat exchange in the second heat exchange unit 222 is recovered to the second unit 221 and may be moved to the precooling unit 100 along the 2-2 refrigerant path G2-2. have.

In addition, the refrigerant transferred from the second unit 221 to the third receiver 234 may be transferred to the third unit 231 by opening and closing a valve of the evaporator 104. The refrigerant delivered to the third unit 231 may be supplied to the third heat exchange unit 232 by the third pump 233. The refrigerant supplied to the third heat exchange unit 232 undergoes final heat exchange in the third heat exchange unit 232 from the inlet gas from which sulfur and carbon dioxide are extracted from the second heat exchange unit 222. Here, the final heat exchange means that the incoming gas reaches -172 degrees. The refrigerant whose temperature is increased through heat exchange in the third heat exchange unit 232 is recovered to the third unit 231 and can be moved to the precooling unit 100 along the 2-3 refrigerant path (G2-3). have.

4 is a diagram showing a sequence in which the gas treatment apparatus according to an embodiment of the present invention processes an incoming gas.

Referring to FIG. 4, a method of treating a gas through a gas processing device includes: an inlet gas inlet step (S1), an inlet gas pressure increase step (S2), an inlet gas temperature decrease step (S3), and an extract separation step. (S4) and extract re-introduction step (S5).

In the inflow step (S1) of the inlet gas, it may be a gas containing an extraction target, and when the extraction target is methane, it may be a gas by anaerobic digestion of organic matter. Inflow gas flowing into the compression unit 300 in an atmosphere of atmospheric pressure and room temperature may have a high pressure in the compression unit 300. Since the object to be extracted can be separated in the process of liquefying the gas and separating each component, an environment in which the gas is liquefied is advantageous, and the environment may be an environment of high pressure and low temperature.

When the pressure condition is satisfied in a pressure environment in which the pressure of the inlet gas is increased by a predetermined pressure from atmospheric pressure in the step S2 of increasing the pressure of the inlet gas, the step of reducing the temperature of the inlet gas may be performed. In the step of reducing the temperature of the inlet gas (S3), the high-pressure gas may be liquefied by satisfying the temperature condition at a low temperature. If the low-temperature conditions are satisfied, a liquefied extract may be generated in each low-temperature step divided into several steps.

In the extract separation step (S4) to be performed subsequently, the first extract (1), the second extract (2), and the third extract (3) may be formulated and extracted to reach respective corresponding liquefaction points. Examples of the extract may be sulfur, carbon dioxide, and methane as described above, and may be a device capable of separating methane with the lowest liquefaction point.

In the case of methane having the lowest liquefaction point, the incoming gas may be initially mixed in a path introduced into the compression unit 300. This step is called the extract re-introduction step (S5). Here, the re-introduced extract is an extract having the lowest liquefaction point, and according to the above example, it may be methane. The extract for re-inflow may be the same material as the refrigerant used to maintain a low-temperature environment in the step of reducing the temperature of the inlet gas.

For example, the refrigerant used in the refrigeration cycle included in the gas treatment apparatus of the present invention may be the same material as the extract having the lowest liquefaction point. For example, the same material may be methane, and the methane may be recovered as a refrigerant used in the refrigeration cycle and reused.

In the extract re-inflow step, the re-inflow of the extract into the compression unit 300 may promote cooling of the compression unit 300. Heat generated in the process of increasing the pressure so as to satisfy the high pressure condition among the liquefaction conditions of the inlet gas may be cooled by re-inflow of the extract. Therefore, overheating of the compression unit 300 can be prevented or prevented.

Although the exemplary embodiments of the present invention have been described in detail above, those of ordinary skill in the art to which the present invention pertains will understand that various modifications may be made to the above-described embodiments without departing from the scope of the present invention. . Therefore, the scope of the present invention is limited to the described embodiments and should not be determined, and should not be determined by the claims to be described later, as well as those equivalent to the claims.

1: first extract
2: second extract
3: third extract
10: fluid circulation part
20: cooling part
21: heat exchange part
22: pump
30: surge tank
100: pre-cooling unit
101: compressor
102: capacitor
103: receiver
104: evaporator
200: main cooling part
210: first cooling unit
211: first unit
212: first heat exchanger
213: first pump
214: first receiver
220: second cooling unit
221: second unit
222: second heat exchange unit
223: second pump
224: second receiver
230: third cooling unit
231: 3rd unit
232: third heat exchanger
233: third pump
234: third receiver
300: compression part
301: first compressor
302: second compressor
303: third compressor
304: fourth compressor
310: first low temperature section
320: second low temperature part
330: third low temperature part
F1: 1st gas path
F2: 2nd gas path
F2-1: 2-1 gas path
F2-2: 2-2 gas path
F2-3: The 2-3rd gas path
F3: 3rd gas path
F4: 4th gas path
G1: 1st refrigerant path
G1-1: 1-1 refrigerant path
G1-2: The 1-2 refrigerant path
G1-3: No. 1-3 refrigerant path
G2: Second refrigerant path
G2-1: 2-1 refrigerant path
G2-2: 2-2 refrigerant path
G2-3: 2-3 refrigerant path
W1: 1st coolant path
W2: 2nd coolant path
S1: Inflow stage of inflow gas
S2: Step of increasing the pressure of the incoming gas
S3: step of lowering the temperature of the incoming gas
S4: extract separation step
S5: Extract re-introduction step

Claims (8)

A compression unit that increases the pressure of the inlet gas;
A cooling unit including a main cooling unit for lowering a temperature of the gas through heat exchange with the inlet gas whose pressure is increased by the compression unit, and a precooling unit for cooling a refrigerant and providing the main cooling unit; And
A fluid circulation unit cooling the compressed unit heated by mixing at least a portion of one of the extracts extracted by cooling the inlet gas by the main cooling unit with the inlet gas and then re-introducing the inlet gas to the compression unit to cool the heated compression unit; Device.
The method according to claim 1,
The extract mixed with the inlet gas is the same material as the refrigerant, gas treatment apparatus.
The method according to claim 1,
The main cooling unit includes a first cooling unit, a second cooling unit, and a third cooling unit for cooling to a temperature at which a plurality of the extracts can be extracted.
The method according to claim 1,
The extract contains sulfur, carbon dioxide and methane, gas treatment apparatus.
The method according to claim 1,
The gas processing apparatus further comprises a cooling part for cooling the compression part.
The method according to claim 1,
The fluid circulation unit cooling the compression unit by repeatedly providing and recovering oil to the compression unit.
The method according to claim 1,
The main cooling unit, wherein the refrigerant whose temperature has increased due to heat exchange with the inlet gas is transferred to the precooling unit to be delivered after recooling.
The inlet gas flows into the compression unit,
The pressure of the inlet gas is increased by compression by the compression unit,
The inlet gas in an increased pressure state is delivered to a cooling unit to extract a first extract at a first temperature, and a second extract is extracted at a second temperature lower than the first temperature, and a third temperature lower than the second temperature The third extract is extracted from,
A portion of the third extract is mixed with the inlet gas by a fluid circulation unit and re-introduced into the compression unit to lower the temperature of the compression unit.

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