CN112810751A - Cargo hold inerting gas purging pipeline and cargo hold inerting gas purging method - Google Patents
Cargo hold inerting gas purging pipeline and cargo hold inerting gas purging method Download PDFInfo
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- CN112810751A CN112810751A CN202110075997.7A CN202110075997A CN112810751A CN 112810751 A CN112810751 A CN 112810751A CN 202110075997 A CN202110075997 A CN 202110075997A CN 112810751 A CN112810751 A CN 112810751A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
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Abstract
The invention belongs to the technical field of inerting and purging of cargo holds. The cargo hold inerting gas-purging pipeline comprises a cargo hold, wherein a cargo hold pipeline is arranged in the cargo hold, and an inert gas inlet pipeline is arranged at the top of the cargo hold. The invention also discloses a method for inerting and purging the cargo hold by using the inerting and purging pipeline for the cargo hold. The inerting gas-purging pipeline is used for solving the technical problems that an existing inerting gas-purging pipeline for the liquid cargo tank is long in operation duration and large in energy consumption.
Description
Technical Field
The invention belongs to the technical field of inerting gas purging of a liquid cargo tank, and particularly relates to an inerting gas purging pipeline for the cargo tank and an inerting gas purging method for the cargo tank.
Background
The cargo hold inerting operation is needed before the cargo ship of the oil tanker chemical ship loads flammable and explosive goods or goods which are easy to react with oxygen, and the cargo hold inerting gas purging operation is needed after the cargo ship unloads the cargo. The inerting of the cargo hold refers to injecting inert gas into the hold, diluting and replacing the gas in the hold, and finally reducing the oxygen concentration content of the gas in the cargo hold to 8 percent (volume percent) or below, wherein the original gas in the cargo hold is mainly air generally. The cargo hold purging is to inject inert gas into the cargo hold, dilute and replace the gas in the cargo hold, further reduce the oxygen concentration and reduce the combustible gas content to a state that the combustible gas cannot be combusted even if air is introduced later (generally, the volume percentage is required to be less than 2%), and the cargo hold raw gas generally mainly comprises combustible cargo steam (hydrocarbon gas). The hold inerting purging has long operation duration and needs to consume a large amount of energy due to the problems of low pressure of the inert gas entering the hold, small flow, limitation of arrangement of pipelines connected with the hold and the like.
As shown in fig. 1 and 2, the current conventional design is that after the inert gas is injected from the top of the cargo compartment, the gas in the cargo compartment is disturbed and gradually mixed and diluted with the gas in the cargo compartment, and meanwhile, the gas in the cargo compartment enters a top vent pipe and is discharged from a degassing cover arranged on a high-speed vent valve. The continuously injected inert gas is gradually mixed with the gas in the cabin, flows, is diluted and is discharged, and the oxygen content of the gas in the cabin and the steam content of the cargo are gradually reduced.
In the conventional design, an inert gas inlet and a cargo compartment exhaust inlet are both arranged above, and because the inert gas is low in flow speed and pressure and low in density relative to the gas in the compartment, the disturbance generated in the compartment after the inert gas enters the compartment is small, the gas dilution speed to the periphery is low, and particularly the gas dilution efficiency of the far-end compartment bottom is low. And the discharge port of the vent pipe of the cargo hold generally extends to a special vent tower area, the pipeline is long and the drift diameter is small, the back pressure is increased for the disturbance of the inert gas inlet cabin, and the efficiency is reduced. Gas dilution plays a major role in conventional inerting purge line design and overall operation. In daily operation, in order to improve dilution efficiency and increase disturbance, a crew generally only performs inerting purging on one cargo hold at a time, but all cargo holds are operated one by one, and the efficiency of the overall time of simultaneous operation of multiple cargo holds is not improved.
Disclosure of Invention
The invention aims to provide a cargo hold inerting purging pipeline to solve the technical problems of low operation efficiency and energy waste of the existing cargo hold inerting purging pipeline.
In order to solve the technical problem, the invention adopts the following technical scheme that the cargo hold inerting gas purging pipeline comprises a liquid cargo hold, wherein a cargo hold pipeline is arranged in the liquid cargo hold, and an inert gas inlet pipeline is arranged at the top of the liquid cargo hold.
By adopting the technical scheme, the method has the following beneficial effects: the air exhaust inlet of the cargo hold is improved from the top to the bottom with a far position by the inerting and purging pipeline of the cargo hold, and the air exhaust pipeline is changed from the original use of a ventilating pipe of the cargo hold to the use of a hold filling pipe and an additional degassing branch pipe.
When gas in the cabin is mixed and diluted, the gas pushing and replacing effect is strengthened and utilized at the initial stage, so that gas which is difficult to be diluted at the bottom of the far end is discharged out of the cabin, the average oxygen or cargo steam content in the cabin is reduced quickly at the initial stage, and the total amount of gas which needs to be diluted in the cabin is effectively reduced. And the degassing pipe which is designed independently is used for replacing the original ventilation pipeline during the exhaust, the exhaust length is shortened and thickened, the exhaust airflow backpressure is reduced, and the energy loss in the diluting flow and displacement pushing process in the cabin is reduced, so that the inerting and purging efficiency is improved.
In order to solve the technical problem that the hold pipeline realizes a one-pipe dual-purpose, namely liquid inlet and exhaust, the invention adopts the following technical scheme that a butterfly valve, a blind flange and a degassing cover are arranged on a degassing pipeline branch along the gas flowing direction.
By adopting the scheme, the method has the following beneficial effects: the degassing branch pipe and the cargo pipe belong to different systems, and the damage caused by leakage and valve misoperation between the systems can be avoided through the double partition of the butterfly valve and the blind flange.
The degassing cover meets the requirements of the specification and USCG and is provided with a flame-resistant and fireproof net, the fireproof net needs to meet the requirement of the maximum test safety clearance (MESG), the requirements of the fireproof net MESG are respectively 0.9mm, 0.65mm and 0.28mm according to the classification IIA, IIB and IIC of the electrical equipment corresponding to the type of goods. The design of the degassing branch pipe and the degassing cover drift diameter should meet the following requirements: when the inert gas device simultaneously drives the gas of the three largest cargo holds, the gas exhaust speed is more than 20 m/s. The degassing branch pipe and the degassing cover are vertically arranged upwards, the height requirement of the degassing cover is more than two meters of the deck surface, and the discharged cargo steam can be effectively prevented from accumulating on the deck surface through the flow speed of the exhaust gas and the arrangement design.
In order to solve the technical problem that the interior of an additionally-added pipeline in the cabin cannot be cleaned, the invention adopts the following technical scheme that a newly-added degassing pipe is connected to a cargo oil loading pipeline, a connecting point is designed at the top of the cabin or outside the cabin, and the outlet of the loading pipe can be conventionally arranged at the bottom (for preventing the static electricity of the cargo) so as to avoid the problem that the interior of the additionally-added pipeline in the cabin cannot be cleaned to affect the next loading of incompatible cargos, and a large number of pipes can be saved.
In order to solve the technical problem of how to improve the gas replacement effect, the invention adopts the following technical scheme that the inert gas inlet pipeline is arranged at the top in the liquid cargo tank and is positioned far away from the lower end opening of the hold tube as far as possible. The design of increasing the drift diameter before the inert gas pipeline enters the cabin is adopted, so that the flow speed of the inert gas entering the cabin is 4-7 m/s when multiple cabins (4-6 cabins) are operated simultaneously. The multi-cabin operation can improve the efficiency of the operation of the cargo cabin of the whole ship, and can reduce the flow speed and pressure of the inert gas entering the cabin to reduce disturbance and enhance the early-stage replacement effect.
The invention simultaneously reserves the original conventional function design of exhausting inert purging gas through the vent pipe, the two inert purging operation methods can be switched and used at any time in the actual operation, and the effect of the actual operation of the two pipeline designs can be easily compared.
The invention aims to provide a cargo hold inerting gas purging method to solve the technical problems of long operation duration and high energy consumption of the existing cargo hold inerting gas purging pipeline.
In order to solve the technical problems, the invention adopts the following technical scheme that the inerting gas purging method for the cargo hold is characterized in that the inerting gas purging method is realized by using the inerting gas purging pipeline for the cargo hold; closing a liquid inlet valve on a cargo oil loading pipeline, closing a degassing cover on a gas permeable pipe of a cargo tank, keeping a vent pipeline consisting of the loading pipeline and a degassing pipe branch smooth, opening an inert gas inlet pipeline at the top of the cargo tank, continuously introducing inert gas into 4-6 cargo tanks, disturbing, mixing and pushing original gas in the tanks after the inert gas enters the tanks, generating dilution and replacement effects, and discharging the gas in the cargo tanks out of the cargo tanks through the loading pipeline and the degassing pipe branch.
In the actual process of inerting and purging the cargo hold, the gases in the hold inevitably carry out dilution and replacement at the same time.
First, ideal inert gas dilution: the incoming gas is turbulently mixed with the primary gas to form a homogeneous mixture throughout the chamber. The result is an exponential decrease in the concentration of the original gas.
Second, ideal inert gas displacement: the entering gas has low speed, less disturbance to the original gas in the cabin, and the entering gas has lower density than the original gas, and the entering gas and the original gas are easy to form an interface layer, so that the new gas pushes the original gas to enter a bottom exhaust pipeline to complete replacement.
In newly designed pipelines and operation, the gas pushing and replacing functions are utilized in an initial stage, so that gas which is difficult to dilute at the bottom of the far end is exhausted out of the cabin, the average oxygen or cargo steam content in the cabin is reduced quickly in the initial stage, and the total amount of gas which needs to be diluted in the cabin is effectively reduced. The efficiency of whole inerting purging is improved. The method specifically comprises the following steps:
in the initial stage of inerting and purging the cargo hold, due to the factors that the inert gas enters the cargo hold at low flow velocity and low pressure, the density of the inert gas is smaller than that of the original gas in the hold, the position of the inert gas inlet pipeline is far away from the exhaust inlet of the hold pipeline, and the like, the inert gas only locally generates disturbance after entering the hold and slowly mixes and flows with the gas in the hold, and the diluting effect of the far-end gas at the bottom in the hold is relatively unobvious. However, in the process of dilution, the inert gas continuously enters the space which can push peripheral gas to replace the gas in the cabin, and at the moment, the gas with the far end close to the exhaust inlet is pushed to be exhausted out of the cabin through the cabin loading pipeline and the degassing pipe branch, so that the gas with relatively high oxygen concentration or liquid cargo steam concentration which is difficult to dilute is exhausted out of the cabin, the total amount of the gas which needs to be diluted in the cabin is reduced, and the gas replacement effect is obvious.
In the middle and later stages of gas is driven in the cargo hold inertization, along with the discharge of cabin interior gas to and the mixed dilution effect that lasts going on, make the gas of keeping in the cabin and advance the density difference between the cabin inert gas and diminish more and less, it is easy relatively to mix the flow each other, and gas disturbance scope increases, and the displacement effect is pushed to the cabin gas has not been obvious, and the under-deck mainly is mixed dilution effect at this moment: the inert gas above the liquid cargo tank continuously enters the tank to disturb, the gas in the tank flows and is mixed to be diluted, and the gas at the far end below the liquid cargo tank continuously enters the tank loading pipe and is discharged out of the tank through the branch of the gas pipe. The gas in the cabin gradually meets the requirements: the oxygen concentration volume percentage is less than 8 percent or the combustible gas concentration volume percentage is less than 2 percent.
In order to solve the technical problem of increasing the replacement effect in the prior period, the invention adopts the following technical scheme that 1, an inert gas inlet is arranged above, an exhaust gas inlet is arranged below, and the positions of the inert gas inlet and the exhaust gas inlet are far away as possible. 2. Meanwhile, inerting and purging operations are carried out on a plurality of cargo holds (4-6), so that the flow speed and pressure of inert gas entering the cargo holds are reduced, but the requirement that the flow speed of exhaust gas passing through a degassing cover is not less than 20m/s needs to be considered. Meanwhile, inerting purging is carried out on 4-6 cargo holds, the inerting purging efficiency of the whole ship can be improved, and in addition, the flow speed and pressure of the inerting gas entering the cargo holds can be reduced, so that disturbance is reduced, and the early-stage replacement effect is enhanced. 3. The drift diameter of the inert gas inlet cabin pipeline is designed, so that when multiple cabins are operated (4-6 cabins) at the same time, the flow velocity of the inert gas entering the cabins is 4-7 m/s. 4. Most cargo has a much higher vapor density than air, inerting the cargo compartment in this environment tends to form and keep the gas pushing against the boundary layer, thereby increasing displacement.
By adopting the scheme, the method has the following beneficial effects: the inert gas inlet is arranged above the cabin, the exhaust inlet is arranged below the cabin, the two are as far as possible, the multiple cabins are operated simultaneously to reduce the pressure and the speed of the inert gas entering the cabin, so that the inert gas with lighter density only forms local disturbance in the cabin after entering the cabin, and the inert gas and the gas in the lower area of the far end are difficult to flow, mix and dilute, and the gas in the cabin with the far end difficult to dilute is pushed, replaced and enters the cabin loading pipe and the degassing branch pipe to be discharged out of the cabin.
Drawings
FIG. 1 is a schematic view of a prior art hold inerting purge line;
FIG. 2 is a schematic view of the flow of dilution-action operating gas to a prior art hold inerting purge line;
FIG. 3 is a schematic view of the structure of the inerting purge line for the cargo hold of the present invention;
FIG. 4 is a schematic view of the gas flow direction for the forepart enhanced displacement operation of the hold inerting purge line of the present invention;
FIG. 5 is a schematic gas flow diagram for a late dilution operation in the hold inerting purge line of the present invention
Figure 6 is a graph comparing experimental performance data of the present invention with that of the prior art.
Detailed Description
As shown in fig. 3, 4 and 5, the inerting cargo tank purging pipeline comprises a cargo tank 1, wherein an inerting gas inlet pipeline 2 and a vent pipe 4 are arranged on the top of the cargo tank 1. An air inlet butterfly valve 21 is arranged on the inert gas inlet pipeline 2. The vent pipe 4 is provided with a vent pipe degassing cover 41. A tank loading pipeline 3 is arranged in the liquid cargo tank 1, and a tank loading butterfly valve 31 is arranged on the tank loading pipeline 3. Except that the air pipe branch 5 is arranged on the loading pipeline 3, the loading pipeline 3 and the degassing pipe branch 1 form a gas exhaust pipeline, and air in the liquid cargo tank is exhausted out of the liquid cargo tank through the loading pipeline and the degassing pipe branch.
The degassing butterfly valve 51, the blind flange 52 and the degassing cover 53 are arranged on the degassing pipeline branch along the gas flow direction.
The degassing cover is provided with a stainless steel flame-resistant fireproof net, the fireproof net needs to meet the requirement of the maximum test safety clearance (MESG), and the requirements of the fireproof net MESG on classification IIA, IIB and IIC of the electrical equipment corresponding to the type of goods are 0.9mm, 0.65mm and 0.28mm correspondingly.
The connecting point of the degassing pipe branch and the loading pipeline is positioned at the top in the liquid cargo tank or outside the liquid cargo tank.
The newly added degassing pipe branch 5 can be connected with a cabin pipe in a cabin or outside the cabin and meets the following conditions:
(1) the exhaust port of the branch of the degassing pipe is vertical to the surface of the deck and is upward and at least two meters higher than the surface of the deck;
(2) the drift diameter design of the degassing pipe branch and the degassing cover of the degassing pipe branch should meet the following requirements: when the inert gas device simultaneously drives the gas of the three largest cargo holds, the gas exhaust speed is not less than 20 m/s.
(3) The degassing butterfly valve 51 and the loading butterfly valve 31 may be designed as remote control valves, equipped with an interlock function, preventing simultaneous opening errors (optional).
The design of increasing the pipeline drift diameter before the inert gas enters the cabin enables the flow velocity of the inert gas entering the cabin to be 4-7 m/s when multiple cabins (4-6 cabins) are operated simultaneously. . The lower end of the loading pipeline 3 extends into the bottom of the liquid cargo tank.
A cargo hold inerting gas purging method is realized by utilizing the cargo hold inerting gas purging pipeline; the inerting gas-expelling method comprises the following specific steps:
closing a cabin butterfly valve 31 on a cabin pipeline 3, closing a ventilating cover 41 of a ventilating pipe 4 of the liquid cargo cabin, keeping a vent pipeline formed by the cabin pipeline and a branch of a degassing pipe smooth, opening an air inlet butterfly valve 21 of an inert gas inlet pipeline at the top of the liquid cargo cabin, continuously and slowly introducing inert gas into the liquid cargo cabins 1, and leading the inert gas into the liquid cargo cabins to generate disturbance and pushing on original gas in the cabins to generate dilution and replacement effects; the gas in the liquid cargo tank is discharged out of the liquid cargo tank through a tank loading pipeline and a degassing pipe branch; the method specifically comprises the following steps:
in the initial stage of inerting and purging the cargo hold, due to the factors that the inert gas enters the cargo hold at low flow velocity and low pressure, the density of the inert gas is smaller than that of the original gas in the hold, the position of the inert gas inlet pipeline is far away from the exhaust inlet of the hold pipeline, and the like, the inert gas only locally generates disturbance after entering the hold and is slowly mixed with the gas in the hold, and the diluting effect of the far-end gas at the bottom in the hold is relatively unobvious. However, in the process of dilution, the inert gas continuously enters the space which can push peripheral gas to replace the gas in the cabin, and at the moment, the gas with the far end close to the exhaust inlet is pushed to be exhausted out of the cabin through the cabin loading pipeline and the degassing pipe branch, so that the gas with relatively high oxygen concentration or liquid cargo steam concentration which is difficult to dilute is exhausted out of the cabin, the total amount of the gas which needs to be diluted in the cabin is reduced, and the gas replacement effect is obvious.
In the middle and later stages of gas is driven in the cargo hold inertization, along with the discharge of cabin interior gas to and the mixed dilution effect that lasts going on, make the gas of keeping in the cabin and advance the density difference between the cabin inert gas and diminish more and less, it is easy relatively to mix the flow each other, and gas disturbance scope increases, and the displacement effect is pushed to the cabin gas has not been obvious, and the under-deck mainly is mixed dilution effect at this moment: the inert gas above the liquid cargo tank continuously enters the tank to be disturbed, the gas in the tank flows and is mixed to be diluted, and the gas in the far-end tank below the liquid cargo tank continuously enters the tank loading pipe and is discharged out of the tank through the branch of the gas pipe. The gas in the cabin gradually meets the requirements: the oxygen concentration volume percentage is less than 8 percent or the combustible gas concentration volume percentage is less than 2 percent.
The inert gas used by the inert gas inlet cabin pipeline is generated by an inert gas generator, the inert gas comprises oxygen with the volume percentage of less than 5%, carbon dioxide with the volume percentage of 10-14% and the balance of nitrogen, and the pressure is 0.01-0.015 MPa when the inert gas is generated; or the inert gas used by the inert gas inlet cabin pipeline is generated by a nitrogen generator, the purity of the nitrogen is more than 95%, and the pressure is 0.01-0.02 MPa when the nitrogen is generated.
In the practical operation verification, the operation efficiency of the novel cargo hold inerting purging pipeline is compared with the operation efficiency of the inerting purging pipeline which is designed conventionally (see table I). In the test, a nitrogen generator is adopted to simultaneously inert 4 cargo holds at the maximum power of 850kW and 3000m3/h (95% purity), wherein 2P and 4S compartments are operated by using a novel inerting purging pipeline, 2S and 4P compartments are operated by using a conventional pipeline, and the inerting target is the oxygen environment of the cargo hold with the oxygen concentration volume percentage below 8% required by the conventional low-flash-point oil product. The oxygen concentration of the gas is detected at the exhaust port of the degassing cover, and the result is shown in the table I and figure 6.
According to the test result, the oxygen concentration content of the gas measured at the discharge port is higher at the initial stage of the novel pipeline inerting operation, but the gas enters the dilution stage to be obviously reduced, so that the effect of the initial inert gas inlet cabin on gas replacement with higher original oxygen concentration in the cabin is verified to be obvious. About 3 hours are needed to achieve the oxygen concentration of the cargo hold of 8 percent by volume by using the novel pipeline inerting operation, more than 4 hours are needed by using the conventional designed pipeline operation, and the inerting time can be saved by more than 1/4. In the test, the original environment of the cargo hold is air, cargo steam (hydrocarbon gas and the like) can exist in the actual operation, the density difference between the cargo steam and the inert gas is increased, and the efficiency advantage of the novel inerting purging is more obvious. By calculating according to the test result, one 5 ten thousand ton oil tanker/chemical tanker uses the novel cargo hold inerting gas driving pipeline to perform one inerting operation on all cargo holds, so that about 1.2 tons of diesel oil can be saved. The design and operation of the novel inerting gas-driving pipeline have very good energy-saving and emission-reducing effects on the operation of the oil tanker/chemical tanker.
Table one: verification of real ship inerting operation efficiency of two pipeline designs
Claims (9)
1. The cargo hold inerting gas-purging pipeline comprises a cargo hold, wherein a cargo hold pipeline is arranged in the cargo hold, and an inert gas inlet pipeline is arranged at the top of the cargo hold.
2. The hold inerting purging line of claim 1, wherein the degassing line branch is provided with a butterfly valve, a blind flange, and a degassing cover along the gas flow direction.
3. The hold inerting purge line of claim 1, wherein the connection point of the deaeration line branch to the hold line is located at the top of the tank interior or outside of the tank.
4. The hold inerting purging line of claim 1, wherein the degassing tube leg is oriented vertically upward and the height of the discharge opening at the top of the degassing tube leg is greater than or equal to 2m from the deck surface.
5. The cargo hold inerting purge line of claim 1, wherein the lower end of said hold line extends into the bottom of the cargo hold; the inert gas inlet pipeline is positioned at the top of the cargo compartment and is far away from the lower end opening of the cargo compartment pipeline.
6. Inerting gas-purging method for cargo holds, characterized in that it is carried out using an inerting gas-purging line for cargo holds according to any of claims 1 to 5; the inerting gas-purging method comprises the following steps:
closing a liquid inlet valve on a cargo oil loading pipeline, closing a degassing cover on a gas permeable pipe of a cargo tank, and keeping a vent pipeline consisting of the loading pipeline and a degassing pipe branch smooth;
opening an inert gas inlet pipeline at the top of the liquid cargo tank, and continuously introducing inert gas into 4-6 liquid cargo tanks at the same time, wherein the inert gas inlet tank meets the flow speed of 4-7 m/s; after the inert gas enters, the raw gas in the cabin is disturbed, mixed and pushed;
in the initial stage of inerting and purging of the cargo hold, after the inert gas enters the hold, the inert gas only locally generates disturbance, and can generate a pushing effect on peripheral gas while slowly mixing and flowing with the gas in the hold, and the gas in the hold, which is difficult to dilute at the bottom of the far end, is pushed and is firstly discharged out of the liquid cargo hold through a hold loading pipeline and a degassing pipe branch, so that the replacement of the gas in the hold by the inert gas is realized;
in the middle and later stages of inerting and purging of the cargo hold, along with the discharge of gas in the hold and the continuous mixing and diluting action, the density difference between the gas reserved in the hold and the inert gas entering the hold is reduced, the inert gas is relatively easy to mix and flow with the gas in the hold after entering the hold, the gas disturbance range is enlarged, and the gas in the hold is diluted in the mixing and flowing process and then is discharged out of the liquid cargo hold through a hold loading pipeline and a degassing pipe branch;
until the gas in the cabin gradually meets the requirements: the oxygen concentration volume percentage is less than 8 percent or the combustible gas concentration volume percentage is less than 2 percent.
7. The inerting gas-purging method for the cargo hold according to claim 6, wherein the inert gas used by the inert gas inlet pipeline is generated by an inert gas generator, the inert gas comprises less than 5% by volume of oxygen, 10% -14% by volume of carbon dioxide and the balance of nitrogen, and the pressure of the inert gas generated is 0.01-0.015 MPa;
or the inert gas used by the inert gas inlet cabin pipeline is generated by a nitrogen generator, the purity of the nitrogen is more than 95%, and the pressure is 0.01-0.02 Mpa when the inert gas is generated;
8. the hold inerting gas purging method as claimed in claim 6, wherein the gas atmosphere of the cargo hold is air, cargo vapor, or a mixture of air and cargo vapor.
9. The inerting gas-purging method for the cargo hold according to claim 6, wherein the diameter of the inert gas inlet pipeline is increased before the inert gas inlet pipeline enters the cargo hold, so that when 4-6 cargo holds are simultaneously filled with the inert gas, the flow velocity of the inert gas entering the cargo hold is 4-7 m/s.
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| CN114954799A (en) * | 2022-08-02 | 2022-08-30 | 山东联化新材料有限责任公司 | Oil loading compartment suitable for cargo ship loads |
| CN115370954A (en) * | 2022-07-11 | 2022-11-22 | 沪东中华造船(集团)有限公司 | Method for carrying out single-cabin replacement, cooling and filling in LNG transport ship |
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| CN114852253B (en) * | 2022-06-10 | 2023-09-12 | 招商局重工(深圳)有限公司 | Multipurpose cargo tank pipeline system and control method thereof |
| CN115370954A (en) * | 2022-07-11 | 2022-11-22 | 沪东中华造船(集团)有限公司 | Method for carrying out single-cabin replacement, cooling and filling in LNG transport ship |
| CN115370954B (en) * | 2022-07-11 | 2023-06-30 | 沪东中华造船(集团)有限公司 | Method for single cabin replacement, cooling and filling in LNG transport ship |
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