CN209441598U - Air displacer for FPSO - Google Patents

Abstract

The utility model discloses a kind of air displacers for FPSO, including the anti-air-return baffle for being arranged in FPSO cabin and being correspondingly arranged with diffuser towards aperture on the venturi type air duct and cabin of cabin bottom；The anti-air-return baffle is set in the undergauge section periphery of the venturi type air duct and for being fixed on cabin aperture；The entrance side of the venturi type air duct is equipped with air intlet, drives air to be open from the entrance of the venturi type air duct with siphon mode and enters, entered in cabin by the undergauge section and diffuser of the venturi type air duct.The air displacer of the utility model, it is useful in the air mode that inertia generator is substituted in FPSO maintenance activity, revolutionize the process of washing of tanks replacement aeration, compared with the operation of traditional inert gas generator air mode, the isolation of more cabins is directly changed into single cabin isolation for Working cabin, saves a large amount of activity durations.

Description

Air displacer for FPSO

Technical field

The utility model relates to gas displacement technical fields in FPSO maintenance activity more particularly to a kind of for FPSO's Air displacer.

Background technique

Marine FPSO (floating storage offloading unit) is widely used in marine petroleum exploitation processing operation field, is typically provided with Several oil cargo tanks, the interim storage for operation on the sea processing crude oil.By taking a specific FPSO as an example, the FPSO volume of compartment amount 170,000 Side, is the double hull structure of single deck, Double bottom, double topsides.Main hull include fore body (including inner cupola), cargo area (including Process tank and dirty oil tank), cabin and tail portion.Oil cargo tank area is by 10 oil cargo tanks, 2 slop tanks, 2 production water tanks, 1 original Oil sedimentation cabin, 6 pairs of dedicated side ballast tank compositions.

It is faced largely due to being related to regularly circular test in 5 years and irregular below deck equipment maintenance activity, FPSO Into cabin operation, in the confined space rich in combustible gas poisonous gas such as FPSO oil cargo tank, before personnel enter cargo tank operation, one As need thoroughly to clean cargo tank, complete to be isolated, ventilation, it is ensured that personnel enter before safe washing of tanks, inerting purging (driving away the combustible gas in cabin using inert gas), inert gas generator air mode air displacement are (using the logical of inert gas generator Inert gas of the wind mode in fresh air displacement cabin), blower air ventilation and etc., thoroughly safely replace cabin in Interior toxic gas, gas safety requirement when entering to personnel, specific job step are described below:

The first step, tank cleaning operation.It first has to reject the residual crude oil in the cabin to other cabins, then according to live oil Cabin actual conditions select two kinds of alternate ways of crude oil washing or sea water washing, and the general job time was at 6-8 hours or so；

Second step, inerting purging operation.It is generally between 5% to 15% in view of combustible gas explosive range, in air displacement Before oil cargo tank, usually need to drive away the combustible gas of oil cargo tank to concentration below 2% using inert gas.FPSO is provided with Special inert gas generator and noble gas inject pipeline to each oil cargo tank, and are equipped with dedicated ventilative pipeline and are used for oil cargo tank Ventilative outlet, the purging operation general job time is between 24-48 hours；

Third step, inert gas generator air mode replace operation.After second step, inertia is substantially filled in oil cargo tank Gas, to avoid inert gas from leaking to deck out of my cabin, the general air mode for using inert gas generator is new to oil cargo tank injection Fresh air, the inert gas in cabin are discharged into atmosphere by ventilative pipeline and ventilative mast.Firstly, before carrying out air displacement, by In all cargo tanks share noble gas inject pipeline, for avoid air enter other oil cargo tanks, it is necessary to by other oil cargo tanks carry out every From, wash a cabin just need to be isolated other 9 compartments noble gas injection pipeline, each cabin at least needs 5 isolating points and blind plate Operation, the operation of 45 isolating points need to be carried out by washing a cabin at least, and a large amount of isolating points cause the isolation activity duration to need 6-8 small When or so；Secondly as the inlet and vent outlet point of noble gas injection pipeline are respectively in the top of each oil cargo tank, convection current effect Fruit is poor, and displaced gas is caused to be difficult for the inert gas of bottom to be sufficiently displaced from, to need to extend the time to be sufficiently displaced from, directly It is greater than 18% to the oxygen content in detection oil cargo tank, flammable Gas content is less than 10%LEL, can just carry out opening the cabin for next step Lid access air blower is aerated operation, and inert gas generator air mode replaces the activity duration generally at 48 hours or more；

4th step, lid connection venturi type pneumatic fan ventilation of opening the cabin.After third step, operating personnel can be first by operation Cabin carries out individually thoroughly blind plate isolation, and the isolation activity duration needs 2 hours or so, then opens hatchcover and connects aerodynamic wind Machine, in the tail end access of pneumatic fan and oil cargo tank with high air duct, it is ensured that fresh air is entered by oil cargo tank bottom, displacement Gas enters ventilative mast by ventilative pipeline, until oxygen content reaches 20.9% in oil cargo tank, other pernicious gas measured values It is 0, this section of activity duration, hereafter under the conditions of continuous ventilating, oil cargo tank can have into cabin probably at 6-12 hours or so Preceding primary condition.

For several job steps before the above-mentioned general operation into cabin, it is primarily present following defect:

Third step is using the inert gas in the air mode displacement oil cargo tank of inert gas generator, due to all oil cargo tanks It shares noble gas and injects pipeline, need to carry out other oil cargo tanks before replacing operation to avoid air from entering other oil cargo tanks 8 word blind plates and intercalary plate carry out comparatively safe isolation, and since pipeline is thick, stock size is made between 14-30 cuns Industry point compares up to nearly 50 or so, and workload is very big, and there are certain risks for field operation, and to prepare enough spare pads Piece.

It the use of the inert gas generator progress air displacement activity duration is being more than 48 hours, the activity duration is longer, due to Cargo Oil Cabin has a large amount of inert gas and fuel gas discharge during air displacement operation, for support personnel's safety and scene Operation safety needs to forbid the hot job industry at scene and limits other field operations, and the ventilating system in life building will also be put into Interior circulation, air displacement operation will seriously affect normal operation order and security.

In air blower ventilating stage, air duct diameter (about 200mm at undergauge) used at present is much smaller than big cabin opening diameter (about 500mm), therefore thus had the disadvantage in that between big cabin aperture and air duct there are biggish gap

1, the air blasted directly returns out from gap, cannot make full use of, and reduces air duct displacement efficiency.It is big with certain facility For the gas displacement of cabin, big cabin as the air inlet of air blower, and is mounted on the wind of aperture there are two the aperture of diameter 500mm Cylinder section diameter is 200mm, then void area accounts for the 84% of entire perforated area, the area that air backflows from gap is accounted for The 42% of entire outlet hole area, the air so as to cause at least air inlet at least 42% directly backflows, and is not participating in big cabin Gas displacement；

2, the toxic and harmful gas being originally present in cabin can be overflowed from gap, make around staff have sucking it is toxic The danger of evil gas, simultaneously because may cause personnel there are larger gap and fall from gap；

3, air duct is fixed inconvenient, may cause the risk that air duct crashes into big cabin；

4, air duct in use due to wind speed quickly, it is easy to produce static electricity, and big cabin aperture is connected without dedicated antistatic Bar tie point is easy to cause antistatic connecting rod to fall off, and generates security risk.

Utility model content

The technical problem to be solved by the present invention is to provide one kind and substitute inertia generator in FPSO maintenance activity Air mode air displacer.

The technical scheme adopted by the utility model to solve the technical problem is as follows: a kind of air displacer is provided, including For be arranged in the cabin of FPSO and with diffuser towards cabin bottom venturi type air duct, corresponding with aperture in cabin set The anti-air-return baffle set；The anti-air-return baffle is set in the undergauge section periphery of the venturi type air duct and for being fixed on cabin In body aperture；

The entrance side of the venturi type air duct is equipped with air intlet, drives air from the literary mound with siphon mode In formula air duct entrance be open enter, entered in cabin by the undergauge section and diffuser of the venturi type air duct.

Preferably, the air displacer further includes connecting for connecting the air displacer with the antistatic of cabin Bar；

The antistatic connecting rod is arranged on the anti-air-return baffle.

Preferably, the anti-air-return baffle is equipped with connecting hole corresponding with the flange upper bolt hole of the aperture periphery.

Preferably, the connecting hole is equipped with multiple, and the circumferential direction along the anti-air-return baffle is evenly spaced on.

Preferably, the anti-air-return baffle is equipped at least one positioning column；The relatively described anti-air-return gear of the positioning column The axial direction of the vertical and parallel venturi type air duct in the surface of plate, the entrance direction of Xiang Suoshu venturi type air duct extend；

The entrance periphery of the venturi type air duct is equipped with the location hole cooperated with the positioning column.

Preferably, the entrance of the venturi type air duct is equipped with the circular orientation portion projected radially outward, described fixed Position portion is located at the opening periphery of the entrance；The location hole is arranged on the positioning region.

Preferably, the movable undergauge section periphery for being set in the venturi type air duct of the anti-air-return baffle.

Preferably, seal washer is equipped between the anti-air-return baffle and the undergauge section of the venturi type air duct.

Preferably, the air displacer further includes at least one handle；

The anti-air-return baffle is arranged in towards on the surface of the entrance of the venturi type air duct and position in the handle In the periphery of the entrance.

The air displacer of the utility model is useful in the air mode that inertia generator is substituted in FPSO maintenance activity Formula revolutionizes the process of washing of tanks replacement aeration, and compared with the operation of traditional inert gas generator air mode, more cabins are isolated Directly variation is that single cabin of Working cabin is isolated, and saves a large amount of activity durations.

Air displacer is mounted in the aperture of cabin, has blocked venturi type air duct and aperture by anti-air-return baffle Between gap, prevent the air for blasting cabin from backflowing from gap, allow all air blasted to original gas in cabin into Line replacement allows the air 100% blasted to participate in gas displacement, improves efficiency.

Detailed description of the invention

Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing:

Fig. 1 is the structural schematic diagram of the air displacer of an embodiment of the present invention；

Fig. 2 is the structural schematic diagram of anti-air-return baffle in Fig. 1；

Fig. 3 is use state diagram of the air displacer of an embodiment of the present invention in cabin.

Specific embodiment

For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed Illustrate specific embodiment of the present utility model.

As shown in Figure 1, 2, the air displacer of an embodiment of the present invention, including venturi type air duct 10 and anti- Return air baffle 20.

Venturi type air duct 10 is used to be arranged in the cabin (such as oil cargo tank) of FPSO.Venturi type air duct 10 include according to The secondary entrance 11 to connect, undergauge section 12 and diffuser 13.In cabin, venturi type air duct 10 is with diffuser 13 towards cabin The bottom of body, so as to the bottom of cabin, original gas in cabin be driven up to be discharged external air delivery.

11 side of entrance of venturi type air duct 10 is equipped with air intlet 14, air intlet 14 and venturi type air duct 10 In axially extending channel be connected, when a small amount of air enters from air intlet 14, can produce siphonic effect, with siphon side Formula drives large quantity of air to enter from the entrance 11 of venturi type air duct 10 opening, passes through the undergauge section 12 of venturi type air duct 10 Enter in cabin with diffuser 13.

Anti-air-return baffle 20 is set in 12 periphery of undergauge section of venturi type air duct 10, for being fixed on cabin aperture, To which entire air displacer is mounted in cabin.Anti-air-return baffle 20 is correspondingly arranged with aperture in cabin, so as to incite somebody to action Gap between venturi type air duct 10 and aperture blocks, and avoids enter into the intracorporal air in cabin and backflows.In addition, gap is blocked Prevent operating personnel from falling from gap.

Anti-air-return baffle 20 has certain thickness (such as 5mm is thick), to guarantee certain intensity, can carry venturi type The weight of air duct 10 and effect personnel accidentally trample weight.Anti-air-return baffle 20 is made of metal material, and can used Conductor in journey as electrostatic conduction.

Specifically, the outer diameter of anti-air-return baffle 20 can be slightly larger than the internal diameter of cabin aperture, to use the fasteners such as bolt Anti-air-return baffle 20 is locked at tapping.Cabin aperture periphery be equipped with flange, when being not required to air displacement, flange be used for it is blind Plate is connected bored closure.Bolt hole on companion flange, anti-air-return baffle 20 are equipped with connecting hole 21 corresponding with bolt hole, It is threaded through in the bolt hole being connected and connecting hole 21 by fasteners such as bolts, anti-air-return baffle 20 is locked at tapping, To also venturi type air duct 10 is fixed in aperture and vacantly in cabin above.

Bolt hole on companion flange, connecting hole 21 be equipped with it is multiple, the circumferential direction along anti-air-return baffle 20 is evenly spaced on.

Anti-air-return baffle 20 can directly be weldingly fixed on 12 periphery of undergauge section of venturi type air duct 10, can also can live Dynamic 12 periphery of undergauge section for being set in venturi type air duct 10.For movable fixing mode, contracting is penetrated on anti-air-return baffle 20 The through-hole diameter of diameter section 12 can be slightly larger than the outer diameter of undergauge section 12, therefore in order to make the two sealing connect, 20 He of anti-air-return baffle Seal washer 30 is equipped between the undergauge section 12 of venturi type air duct 10.

In addition, the movable fixing mode for anti-air-return baffle 20 on venturi type air duct 10, facilitates anti-air-return to keep off The dismounting of plate 20 also facilitates the replacement of anti-air-return baffle 20, thus air displacer can as needed displaced air cabin The anti-air-return baffle 20 of the size selection correspondingly-sized of aperture.

On venturi type air duct 10, entrance 11 is detachable.When installing anti-air-return baffle 20, first by entrance 11 from undergauge It dismantles in section 12, again loads onto entrance 11 after anti-air-return baffle 20 is set in undergauge section 12.

To position anti-air-return baffle 20, anti-air-return baffle 20 can be equipped at least one positioning column 22.Positioning column The axial direction of 22 vertical with respect to the surface of anti-air-return baffles 20 and parallel venturi type air ducts 10, to the entrance of venturi type air duct 10 11 directions of section extend.

11 periphery of entrance of venturi type air duct 10 is equipped with the location hole (not shown) cooperated with positioning column 22.Anti-air-return After 20 sets of baffle are set to venturi type air duct 10, entrance 11 is matched by location hole thereon with positioning column 22, to preventing back Windshield plate 20 is positioned, and circumferentially rotating for anti-air-return baffle 20 can be limited.

The entrance 11 of venturi type air duct 10 is equipped with radially outward (far from 10 central axes direction of venturi type air duct) The circular orientation portion 15 of protrusion, positioning region 15 are located at the opening periphery of entrance 11.Location hole is arranged on positioning region 15.It is fixed Position hole can be the through-hole that perforation is arranged on positioning region 15, be also possible to that the locating slot of 15 peripheral region of positioning region is arranged in.

Further, the air displacer of the utility model further includes for connecting the air displacer and cabin Antistatic connecting rod 40 bridges line connection point as antistatic, is connected to the antistatic connecting rod 40 and cabin by connecting line Metal sites on, release 10 high wind speed of venturi type air duct generate electrostatic.Antistatic connecting rod 40 can pass through the side such as welding Formula is arranged on anti-air-return baffle 20.

The air displacer of the utility model further includes at least one handle 50.Handle 50 is arranged in anti-air-return baffle 20 Periphery on towards the surface of the entrance 11 of venturi type air duct 10 and positioned at entrance 11 facilitates staff to dismount air Displacement apparatus.

The setting of handle 50 form is unlimited, such as can be arch bridge shape shown in FIG. 1, is also possible to vertically in anti-air-return baffle 20 On column or plate structure etc..

The air displacer of the utility model is useful in the washing of tanks replacement aeration of FPSO maintenance activity, substitution inertia hair The air mode of raw device, cancels the operation of inert gas generator, reduces the energy consumption because of inert gas generator operation.With reference to Fig. 1, 3, the application method of the air displacer of the utility model may include following steps:

S1, air displacer is mounted at the aperture 3 of cabin 2 (such as oil cargo tank) of FPSO.

Aperture is located at the top of cabin 2.When installation, the anti-air-return baffle 20 of air displacer is cooperated in aperture 3 On flange, blending bolt locks together the two.The diffuser 11 of the venturi type air duct 10 of air displacer is towards cabin The bottom of body 2, entrance 11 can be located at aperture 3 and can be used for accessing air.Anti-air-return baffle 20 is by venturi type air duct 10 and opens Gap between hole 3 blocks, it is ensured that the air 100% of inflow enters 2 bottom of cabin.

At the same time, other upper unrelated cabins of FPSO are not required to be isolated, and the isolation that is much less and blind plane operation reduce Labor intensity, while reducing many isolation activity durations and security risk.

S2, it is inputted by the air intlet 14 of 11 side of entrance of venturi type air duct 10 to venturi type air duct 10 (or blasting) air, air enters from air intlet 14 generates siphonic effect, drives air from venturi type wind with siphon mode The entrance 11 of cylinder 10, which is open, to be entered, and is entered in cabin 2 by the undergauge section 12 and diffuser 13 of venturi type air duct 10.

Wherein, the air of air intlet 14 is a small amount of (such as 20%), by siphon drive the air of a large amount of (such as 80%) from The opening of entrance 11 enters.

S3, the outlet 4 that original noble gas passes through 2 top of cabin in cabin 2 is driven to be delivered into the air in cabin 2 Gas mast.

Air displacement is carried out in the big cabin to 17000 cubic metres of volumes using the air displacer of the utility model When, by oxygen content in big cabin from 3% rise to 20.9% qualification when, the time as required for the air mode of original inertia generator About 48h shorten to 12h, saves the plenty of time, and efficiency is significantly promoted.

The air displacer of the utility model is applicable not only to oil cargo tank, it may also be used for other big cabin, ballast tank, pots The places such as furnace, separator.

The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in Other related technical areas are also included in the patent protection scope of the utility model.

Claims (9)

1. a kind of air displacer for FPSO, which is characterized in that including for being arranged in the cabin of FPSO and to expand Dissipate the anti-air-return baffle (20) that section (13) are correspondingly arranged towards aperture on the venturi type air duct (10) and cabin of cabin bottom； The anti-air-return baffle (20) is set in undergauge section (12) periphery of the venturi type air duct (10) and for being fixed on cabin In aperture；

The entrance side of the venturi type air duct (10) is equipped with air intlet (14), drives air from described with siphon mode The entrance (11) of venturi type air duct (10), which is open, to be entered, and the undergauge section (12) and expansion of the venturi type air duct (10) are passed through Section (13) are dissipated to enter in cabin.

2. air displacer according to claim 1, which is characterized in that the air displacer further includes for connecting Connect the antistatic connecting rod (40) of the air displacer and cabin；

The antistatic connecting rod (40) is arranged on the anti-air-return baffle (20).

3. air displacer according to claim 1, which is characterized in that the anti-air-return baffle (20) is equipped with and institute State the corresponding connecting hole of flange upper bolt hole (21) of aperture periphery.

4. air displacer according to claim 3, which is characterized in that the connecting hole (21) be equipped with it is multiple, along institute The circumferential direction for stating anti-air-return baffle (20) is evenly spaced on.

5. air displacer according to claim 1, which is characterized in that the anti-air-return baffle (20) is equipped at least One positioning column (22)；The surface of the relatively described anti-air-return baffle (20) of the positioning column (22) is vertical and the parallel venturi Entrance (11) direction of the axial direction of formula air duct (10), Xiang Suoshu venturi type air duct (10) extends；

Entrance (11) periphery of the venturi type air duct (10) is equipped with the location hole cooperated with the positioning column (22).

6. air displacer according to claim 5, which is characterized in that the entrance of the venturi type air duct (10) (11) it is equipped with the circular orientation portion (15) projected radially outward, the positioning region (15) is located at the opening of the entrance (11) Locate periphery；The location hole is arranged on the positioning region (15).

7. air displacer according to claim 1, which is characterized in that the anti-air-return baffle (20) is movable to be arranged In undergauge section (12) periphery of the venturi type air duct (10).

8. air displacer according to claim 6, which is characterized in that the anti-air-return baffle (20) and the literary mound In formula air duct (10) undergauge section (12) between be equipped with seal washer (30).

9. air displacer according to claim 1-8, which is characterized in that the air displacer also wraps Include at least one handle (50)；

The handle (50) setting is in the anti-air-return baffle (20) towards the entrance (11) of the venturi type air duct (10) Surface on and be located at the entrance (11) periphery.