Methanol and sealing oil separation system
By designing a separation system between methanol and sealing oil, using density difference for natural separation, and equipped with a nitrogen purge system, the problem of impure methanol fuel is solved, effective separation between methanol and sealing oil and pure fuel supply is achieved, and the main machine's Lifetime and saves additional separation devices in limited space.
Patent Information
- Application Number
- CN202421046947.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-14
AI Technical Summary
The lack of a special separation system between methanol and sealing oil in the prior art leads to impurity of methanol fuel, affecting the operating life of the main engine, and the ship structure is fixed and the volume is limited, making it difficult to achieve rapid and effective separation of methanol and sealing oil.
A methanol and sealing oil separation system was designed, including a methanol separation daily cabinet, a methanol mixed liquid reflux input pipeline and a methanol outflow pipeline, which was separated naturally by density difference, and was equipped with a nitrogen purge system to prevent methanol residue from corroding the equipment and Volatilization.
The effective separation of methanol and sealing oil is achieved, ensuring the pure methanol fuel, extending the service life of the host, and saving additional separation devices in a limited space to prevent the corrosion and volatility of methanol residues on the equipment.
Smart Images
Figure CN222238904U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of marine gas supply, in particular to a methanol and sealing oil separation system. Background Art
[0002] In the methanol fuel filling skid, part of the methanol supplied to the main engine will flow back into the daily cabinet. The methanol passing through the main engine will bring out part of the sealing oil leaked from the main engine. The content of sealing oil in this part of the methanol that flows back is relatively low, less than 10%. In the prior art, there is no corresponding special separation system for this part of the mixture of methanol and sealing oil, so this part of methanol containing trace amounts of sealing oil goes directly to the methanol supply system and is heated and pressurized before being supplied to the ship's main engine for use. The impurity of methanol fuel will cause malfunctions in the main engine operation under long-term use, affecting the service life of the main engine.
[0003] Since the ship structure is fixed and the volume is limited, it is necessary to improve the existing daily cabinets within the limited space so that methanol and sealing oil can be separated quickly, efficiently and stably to obtain pure methanol fuel. Summary of the invention
[0004] In view of the deficiencies of the prior art, the utility model provides a methanol and sealing oil separation system to solve the problem that methanol is not easy to add, store and supply to a host in the traditional method.
[0005] The technical scheme of the utility model is: a methanol and sealing oil separation system, comprising a methanol separation daily cabinet, a methanol mixed liquid reflux input pipeline, and a methanol outflow pipeline, the methanol separation daily cabinet comprises a reflux bin and a supply bin, the methanol and sealing oil mixed liquid flowing back from the main engine enters the reflux bin from the methanol mixed liquid reflux input pipeline, the methanol outflow pipeline is arranged at the bottom of the supply bin, and the separated pure methanol enters the methanol supply system from the methanol outflow pipeline; the reflux bin and the supply bin are two storage bins separated in the methanol separation daily cabinet.
[0006] Preferably, a first partition and a second partition are provided in the middle of the methanol separation daily cabinet, the bottom of the second partition is connected to the bottom of the methanol separation daily cabinet and divides the methanol separation daily cabinet into a reflux bin and a supply bin, and the upper end of the second partition is provided with an opening for liquid to overflow from the reflux bin to the supply bin; the top of the first partition is fixedly connected to the top of the methanol separation daily cabinet, the lower end of the first partition extends downward to the middle of the methanol separation daily cabinet, and the lower end of the first partition is lower than the upper end of the second partition, and a channel for methanol liquid to overflow is formed between the first partition and the second partition.
[0007] As a further preference, the height of the second partition is not less than 85% of the height of the entire methanol separation daily cabinet.
[0008] Preferably, a sealing oil discharge channel and a methanol discharge channel are respectively provided at the bottom of the reflux bin and the supply bin; an interface liquid level gauge is provided at the middle and lower part of the reflux bin; a temperature sensor is provided at the middle and lower part of the supply bin and a liquid level switch is provided at the top; and a differential pressure liquid level measuring device is provided on the side of the supply bin.
[0009] Preferably, a switch valve and a filter are provided on the methanol mixed liquid reflux input pipeline, and differential pressure transmitters are provided at both ends of the filter.
[0010] Preferably, the methanol and sealing oil separation system also includes a methanol storage tank input pipeline, which includes a methanol storage tank input end and a methanol daily cabinet input end, the methanol daily cabinet input end is arranged at the end of the methanol storage tank input pipeline, and the methanol daily cabinet input end extends to the bottom of the supply bin of the methanol separation daily cabinet, a double delivery pump is provided in the methanol storage tank input pipeline, a filter is provided upstream of the delivery pump, pressure differential transmitters are provided at both ends of the filter, and a pressure transmitter is provided downstream of the delivery pump.
[0011] As a further preferred embodiment, the methanol storage tank input pipeline is connected to a delivery pump return pipeline, and the connection point between the delivery pump return pipeline and the methanol storage tank input pipeline is located downstream of the pressure transmitter; a liquid collecting pan is provided below the delivery pump, and a liquid collecting pan discharge port is provided.
[0012] As further preferred, the methanol and sealing oil separation system also includes a nitrogen purge system, which includes a nitrogen purge inlet, a No. 1 purge pipeline, a No. 2 purge pipeline and a No. 3 purge pipeline. The input end of the No. 1 purge pipeline is the nitrogen purge inlet. The No. 1 purge pipeline is connected to the methanol storage tank input pipeline, and the connection point is located upstream of the differential pressure transmitter in the methanol storage tank input pipeline. The filter is provided with a No. 1 purge outlet. When purging, nitrogen enters from the nitrogen purge inlet, passes through the No. 1 purge pipeline, It is discharged from the No. 1 purge outlet; the input end of the No. 2 purge pipeline is the nitrogen purge inlet, and the No. 2 purge pipeline is connected to the input end of the methanol daily cabinet; when purging, nitrogen enters from the nitrogen purge inlet, passes through the No. 2 purge pipeline, and is discharged from the input end of the methanol daily cabinet; the input end of the No. 3 purge pipeline is the nitrogen purge inlet, and the No. 3 purge pipeline is connected to the methanol outflow pipeline, and the end of the methanol outflow pipeline is provided with a No. 3 purge outlet; when purging, nitrogen enters from the nitrogen purge inlet, passes through the No. 3 purge pipeline, and is discharged from the No. 3 purge outlet.
[0013] Preferably, the reflux bin of the methanol separation daily cabinet is also provided with a reflux input end of a methanol supply system.
[0014] Preferably, the methanol and sealing oil separation system is also provided with an ESD valve.
[0015] The beneficial effects of the utility model are as follows: the utility model accurately utilizes the different densities of the sealing oil and methanol to form natural separation, and the structure is simple and reliable.
[0016] The utility model rationally utilizes the limited space in the ship, improves on the basis of the original daily cabinet, does not introduce other additional separation devices, saves ship space and effectively separates the sealing oil from methanol.
[0017] The utility model is also equipped with a nitrogen purge system, which is perfectly combined with the methanol and sealing oil separation system. The nitrogen purge system is configured for purge to prevent methanol residue from corroding the equipment and volatilizing to cause poisoning. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the pipeline connection relationship structure of the utility model.
[0019] Figure 2 It is a schematic diagram of the structure of the nitrogen purge system of the utility model.
[0020] Description of labels:
[0021] 1: Delivery pump return line; 2: Pressure differential transmitter; 3: Methanol tank input; 4: Filter; 5: Delivery pump; 6: Pressure transmitter; 7: Interface level gauge; 8: Reflux bin; 9: Sealing oil discharge channel; 10: Methanol daily cabinet input; 11: Supply bin; 12: Methanol discharge channel; 13: Temperature sensor; 14: Methanol outflow pipeline; 15: Pressure differential level measuring device; 16: Methanol supply system reflux input ; 17: Methanol mixed liquid reflux input pipeline; 18: Liquid level switch; 19: Second partition; 20: First partition; 21: Switch valve; 22: ESD valve; 23: Nitrogen purge inlet; 24: No. 1 purge pipeline; 25: No. 1 purge outlet; 26: Liquid collecting tray; 27: Liquid collecting tray discharge port; 28: No. 3 purge outlet; 29: No. 3 purge pipeline; 30: No. 2 purge pipeline; 31: Methanol separation daily cabinet. DETAILED DESCRIPTION
[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0023] like Figure 1As shown, this embodiment includes a methanol separation daily cabinet 31, a methanol mixture reflux input pipe 17, and a methanol outflow pipe 14. The methanol separation daily cabinet 31 includes a reflux bin 8 and a supply bin 11. The methanol and sealing oil mixture flowing back from the main engine enters the reflux bin 8 from the methanol mixture reflux input pipe 17. The methanol outflow pipe 14 is arranged at the bottom of the supply bin 11. The separated pure methanol enters the methanol supply system from the methanol outflow pipe 14. The reflux bin 8 and the supply bin 11 are two storage bins separated in the methanol separation daily cabinet 31.
[0024] In this embodiment, a first partition 20 and a second partition 19 are provided in the middle of the methanol separation daily cabinet 31, the bottom of the second partition 19 is connected to the bottom of the methanol separation daily cabinet 31 and divides the methanol separation daily cabinet into a reflux bin 8 and a supply bin 11, and an opening is provided at the upper end of the second partition 19 for liquid to overflow from the reflux bin 8 to the supply bin 11; the top of the first partition 20 is fixedly connected to the top of the methanol separation daily cabinet 31, the lower end of the first partition 20 extends downward to the middle of the methanol separation daily cabinet 31, and the lower end of the first partition 20 is lower than the upper end of the second partition 19, and a channel for methanol liquid to overflow is formed between the first partition 20 and the second partition 19.
[0025] In the methanol fuel filling skid, part of the methanol supplied to the main engine will flow back into the methanol separation daily cabinet 31 through the methanol mixture reflux input pipe 17. The methanol passing through the main engine will bring out part of the sealing oil leaked from the main engine. This part of the methanol & sealing oil mixed solution flows back into the methanol separation daily cabinet 31 and first enters the reflux bin 8 in the daily cabinet. Due to the different densities of different media, the sealing oil sinks below and the clean methanol solution floats above, so a separation can be performed. Moreover, the proportion of sealing oil in the mixed liquid is less than 10%. The clean methanol solution overflows from the top of the second partition 19 into the supply bin 11 and is transported to the methanol supply system through the methanol outflow pipe 14.
[0026] In this embodiment, the reflux bin 8 of the methanol separation daily cabinet 31 is also provided with a methanol supply system reflux input terminal 16. The pure methanol refluxed from the methanol supply system is transported in this pipeline and can be directly returned to the reflux bin 8 for recycling.
[0027] The lower end of the first partition 20 extends downwardly below the upper end of the second partition 19 because this structure can prevent the liquid discharged from the methanol mixture reflux input pipe 17 and the methanol supply system reflux input end 16 into the reflux bin 8 from churning, so that impure methanol can directly enter the supply bin 11 from the upper end opening of the second partition 19. The structure of the first partition 20 acts as a side barrier, ensuring that the pure methanol after separation overflows from the channel between the first partition 20 and the second partition 19 into the supply bin 11.
[0028] In this embodiment, the height of the second partition plate 19 is not less than 85% of the height of the entire methanol separation daily cabinet 31 .
[0029] In this embodiment, the bottom of the reflux bin 8 and the supply bin 11 are respectively provided with a sealing oil discharge channel 9 and a methanol discharge channel 12; as the reflux filling process continues, the sealing oil in the reflux part becomes more and more, so it is necessary to discharge the excess sealing oil from the daily cabinet. We use the interface level meter 7 to detect the interface where methanol and sealing oil intersect, and use this as a basis to judge the amount of sealing oil in the supply part, and when the sealing oil level reaches a certain value, discharge part of the sealing oil.
[0030] An interface level meter 7 is provided in the middle and lower part of the reflux bin 8; the interface level meter 7 can be a DOWESTON model LBSF-506 microwave level switch. Simply put, its principle is that when microwaves are emitted and encounter different media, there will be different oscillation feedbacks; we know that the liquid level has reached our set point based on different oscillation feedbacks, and transmit this signal to our system, which will open the sealing oil discharge channel 9, discharge part of the sealing oil, and reduce the liquid level of the reflux bin 8. A temperature sensor 13 is provided in the middle and lower part of the supply bin 11, and a liquid level switch 18 is provided on the top; the temperature sensor 13 monitors the temperature in the supply bin 11 in real time, and the liquid level switch 18 on the top outputs a signal to the safety control system when the liquid level reaches a high state, controls several ESD valves 22 to close, stops filling, and can open the methanol discharge channel 12 to discharge part of the methanol and reduce the liquid level of the supply bin 11; and a pressure difference liquid level measuring device 15 is provided on the side of the supply bin 11.
[0031] A set of differential pressure level measuring device 15 and temperature sensor 13 can calculate the liquid level. From the pressure difference between the top and bottom of the supply bin 11, the liquid level height difference can be measured according to the formula P=ρgh, thereby knowing the liquid level height of the supply bin 11.
[0032] In this embodiment, the methanol mixed liquid reflux input pipeline 17 is provided with a switch valve 21 and a filter 4, and the two ends of the filter 4 are provided with a differential pressure transmitter 2. The filter 4 is used to filter the solid impurities in the methanol liquid. After the filter 4 is used for a long time, the differential pressure at both ends of the filter 4 will be particularly high, requiring manual maintenance, so the differential pressure transmitter 2 is provided to observe the differential pressure at both ends of the filter 4 in real time.
[0033] In this embodiment, the methanol and sealing oil separation system also includes a methanol storage tank input pipeline, which includes a methanol storage tank input end 3 and a methanol daily cabinet input end 10. The methanol daily cabinet input end 10 is arranged at the end of the methanol storage tank input pipeline, and the methanol daily cabinet input end 10 extends to the bottom of the supply bin 11 of the methanol separation daily cabinet 31. A double delivery pump 5 is provided in the methanol storage tank input pipeline, and a filter 4 is provided upstream of the delivery pump 5. A pressure differential transmitter 2 is provided at both ends of the filter 4. The filter 4 is used to filter the liquid. After the filter 4 has been used for a long time, the pressure difference at both ends of the filter 4 will be particularly high, requiring manual maintenance, so a pressure differential transmitter 2 is provided to observe the pressure difference at both ends of the filter 4 in real time. A pressure transmitter 6 is provided downstream of the delivery pump 5 to observe the pressure flowing out of the delivery pump 5. The methanol in the methanol storage tank cannot be directly used in the methanol supply system. It needs to pass through the daily cabinet and be heated and pressurized to meet the requirements before it can be used. The heating and pressurizing device is not the content protected by the utility model, and will not be repeated here. Since the methanol in the methanol storage tank is pure, it can be directly input into the supply bin 11 of the methanol separation daily cabinet 31 .
[0034] In this embodiment, the methanol storage tank input pipeline is connected to the delivery pump return pipeline 1, and the connection point between the delivery pump return pipeline 1 and the methanol storage tank input pipeline is located downstream of the pressure transmitter 6; when the pressure at the outlet of the delivery pump 5 is too high, the delivery pump return pipeline 1 is opened to reflux part of the methanol to reduce the pressure. A liquid collecting pan 26 is provided below the delivery pump 5 to catch the leaked methanol, and a liquid collecting pan discharge port 27 is provided. When the liquid collecting pan 26 is full, the methanol is caught through the liquid collecting pan discharge port 27.
[0035] like Figure 2As shown, in this embodiment, the methanol and sealing oil separation system also includes a nitrogen purge system, which includes a nitrogen purge inlet 23, a No. 1 purge pipeline 24, a No. 2 purge pipeline 30 and a No. 3 purge pipeline 29. The input end of the No. 1 purge pipeline 24 is the nitrogen purge inlet 23, and the No. 1 purge pipeline 24 is connected to the methanol storage tank input pipeline. The connection point is located upstream of the differential pressure transmitter 2 in the methanol storage tank input pipeline. A No. 1 purge outlet 25 is provided at the filter 4; during nitrogen purging, nitrogen enters from the nitrogen purge inlet 23, passes through the No. 1 purge pipeline 24, and exits from the No. 1 purge outlet The input end of the No. 2 purge pipeline 30 is the nitrogen purge inlet 23, and the No. 2 purge pipeline 30 is connected to the input end 10 of the methanol daily cabinet; when purging, nitrogen enters from the nitrogen purge inlet 23, passes through the No. 2 purge pipeline 30, and is discharged from the input end 10 of the methanol daily cabinet; the input end of the No. 3 purge pipeline 29 is the nitrogen purge inlet 23, and the No. 3 purge pipeline 29 is connected to the methanol outflow pipeline 14, and the end of the methanol outflow pipeline 14 is provided with a No. 3 purge outlet 28; when purging, nitrogen enters from the nitrogen purge inlet 23, passes through the No. 3 purge pipeline 29, and is discharged from the No. 3 purge outlet 28. A nitrogen purge system is configured for purging to prevent methanol residues from corroding the equipment and volatilizing to poison people.
[0036] In this embodiment, the methanol and sealing oil separation system is further provided with an ESD valve 22. The ESD valve 22 is mainly provided in the delivery pump reflux pipeline 1, the methanol mixture reflux input pipeline 17, the methanol supply system reflux pipeline, the methanol daily cabinet input end 10 and the methanol outflow pipeline 14. In an emergency, upon receiving the output signal of the safety control system, the valves of these routes can be controlled to be cut off through the ESD valve 22.
[0037] In this embodiment, the control system mentioned refers to the control method of each valve pipeline in the prior art, which is the prior art and does not belong to the content protected by the present utility model, and will not be described in detail here.
[0038] In the description of the utility model specification, it is necessary to understand that the orientation or position relationship indicated by the terms "upper end", "lower end", "end", "below" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.
[0039] In the present invention, unless otherwise specified and limited, the term "connection" and other terms should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A methanol and sealing oil separation system, characterized in that The invention comprises a methanol separation daily cabinet (31), a methanol mixed liquid reflux input pipe (17), and a methanol outflow pipe (14). The methanol separation daily cabinet (31) comprises a reflux bin (8) and a supply bin (11). The methanol and sealing oil mixed liquid flowing back from the main engine enters the reflux bin (8) from the methanol mixed liquid reflux input pipe (17). The methanol outflow pipe (14) is arranged at the bottom of the supply bin (11). The separated pure methanol enters the methanol supply system from the methanol outflow pipe. The reflux bin (8) and the supply bin (11) are two storage bins separated from each other in the methanol separation daily cabinet (31).
2. A methanol and sealing oil separation system according to claim 1, characterized in that A first partition (20) and a second partition (19) are provided in the middle of the methanol separation daily cabinet (31); the bottom of the second partition (19) is connected to the bottom of the methanol separation daily cabinet (31) and divides the methanol separation daily cabinet into a reflux bin (8) and a supply bin (11); an opening is provided at the upper end of the second partition (19) for liquid to overflow from the reflux bin (8) to the supply bin (11); the top of the first partition (20) is fixedly connected to the top of the methanol separation daily cabinet (31); the lower end of the first partition (20) extends downward to the middle of the methanol separation daily cabinet (31), and the lower end of the first partition (20) is lower than the upper end of the second partition (19); a channel for methanol liquid to overflow is formed between the first partition (20) and the second partition (19).
3. A methanol and sealing oil separation system according to claim 2, characterized in that The height of the second partition plate (19) is not less than 85% of the height of the entire methanol separation daily cabinet (31).
4. A methanol and sealing oil separation system according to claim 1, characterized in that The bottoms of the reflux bin (8) and the supply bin (11) are respectively provided with a sealing oil discharge channel (9) and a methanol discharge channel (12); the middle and lower part of the reflux bin (8) is provided with an interface liquid level gauge (7); the middle and lower part of the supply bin (11) is provided with a temperature sensor (13) and a liquid level switch (18) at the top; and the side of the supply bin (11) is provided with a pressure difference liquid level measuring device (15).
5. A methanol and sealing oil separation system according to claim 1, characterized in that The methanol mixed liquid reflux input pipeline (17) is provided with a switch valve (21) and a filter (4), and pressure differential transmitters (2) are provided at both ends of the filter (4).
6. A methanol and sealing oil separation system according to claim 1, characterized in that The methanol and sealing oil separation system further comprises a methanol storage tank input pipeline, the pipeline comprising a methanol storage tank input end (3) and a methanol daily cabinet input end (10), the methanol daily cabinet input end (10) being arranged at the end of the methanol storage tank input pipeline, and the methanol daily cabinet input end (10) extending to the bottom of a supply bin (11) of a methanol separation daily cabinet (31), a double delivery pump (5) being arranged in the methanol storage tank input pipeline, a filter (4) being arranged upstream of the double delivery pump (5), pressure differential transmitters (2) being arranged at both ends of the filter (4), and a pressure transmitter (6) being arranged downstream of the double delivery pump (5).
7. A methanol and sealing oil separation system according to claim 6, characterized in that The methanol storage tank input pipeline is connected to a delivery pump return pipeline (1), and the connection point between the delivery pump return pipeline (1) and the methanol storage tank input pipeline is located downstream of the pressure transmitter (6); a liquid collecting pan (26) is provided below the double delivery pump (5), and a liquid collecting pan discharge port (27) is provided.
8. A methanol and sealing oil separation system according to claim 6, characterized in that The methanol and sealing oil separation system also includes a nitrogen purge system, which includes a nitrogen purge inlet (23), a No. 1 purge pipeline (24), a No. 2 purge pipeline (30) and a No. 3 purge pipeline (29). The input end of the No. 1 purge pipeline (24) is the nitrogen purge inlet (23). The No. 1 purge pipeline (24) is connected to the methanol storage tank input pipeline, and the connection point is located upstream of the differential pressure transmitter (2) in the methanol storage tank input pipeline. The filter (4) is provided with a No. 1 purge outlet (25). During purging, nitrogen enters from the nitrogen purge inlet (23), passes through the No. 1 purge pipeline (24), and is discharged from the No. 1 purge outlet (25). The input end of the No. 2 purge pipeline (30) is a nitrogen purge inlet (23), and the No. 2 purge pipeline (30) is connected to the input end (10) of the methanol daily cabinet; during purging, nitrogen enters from the nitrogen purge inlet (23), passes through the No. 2 purge pipeline (30), and is discharged from the input end (10) of the methanol daily cabinet; the input end of the No. 3 purge pipeline (29) is a nitrogen purge inlet (23), and the No. 3 purge pipeline (29) is connected to the methanol outflow pipeline (14), and a No. 3 purge outlet (28) is provided at the end of the methanol outflow pipeline (14); during purging, nitrogen enters from the nitrogen purge inlet (23), passes through the No. 3 purge pipeline (29), and is discharged from the No. 3 purge outlet (28).
9. A methanol and sealing oil separation system according to claim 1, characterized in that The reflux bin (8) of the methanol separation daily cabinet (31) is also provided with a methanol supply system reflux input end (16).
10. A methanol and sealing oil separation system according to claim 1, characterized in that The methanol and sealing oil separation system is also provided with an ESD valve (22).