JPS60183003A - Condensate recovery tank - Google Patents

Abstract

PURPOSE:To simplify the structure of the titled tank by omitting a pump, by providing a liquid extruding air bag inflating through the supply of air in the tank. CONSTITUTION:Drains in a non-combustible gas supply pipe 20 and a crude oil gas exhaust pipe 21 are introduced into traps 24, 25 through drain pipes 22, 23 to separate the gaseous components therein and introduced into a tank main body 1. The gas in the tank 1 is guided to an activated carbon sealed vessel 53 from gas passing orifices 19 provided to the spacer 18 of an air bag 2 and exhausted from an exhaust pipe 29. When the liquid level of the drain reaches a max. one, the high alarm provided to the liquid level meter 51 of a liquid level detection pipe 31 is operated and the inflow of the drain to the tank is stopped while plant air is supplied into the air bag 2 from an air pipe 32 through an air access pipe 30 to pressurize the drain which is, in turn, returned to an oil-containing water pipe 34 through a drain access pipe 26 and a drain return pipe to be sent to a recovered oil tank 56.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to condensate recovery tanks, and more particularly:
At offshore oil storage bases where large amounts of crude oil are stored on offshore storage vessels, this drain collects gas condensate collected inside nonflammable gas supply pipes and crude oil gas discharge pipes and sends it to wastewater treatment equipment. Regarding recovery tanks. The present invention also relates to a condensate recovery tank which can also be used for recovering steam condensate.

Conventional technology At offshore oil storage bases, nonflammable gas is supplied and crude oil gas is discharged for the purpose of explosion-proofing the storage ships, but the gas condenses inside these conduits due to rapid cooling of the climate. Since a large amount of condensate is generated and this poses a serious obstacle to gas transfer, there is a need for a rational means for recovering this condensate.

When designing a drain recovery device, one thing to consider is that the condensed condensate of crude oil gas has a somewhat foul odor and contains flammable components, so the drain recovery device should be sealed in a sealed manner from the perspective of pollution prevention J3 and explosion prevention. It is necessary to overturn the method.

Conventionally, sealed 11-type drain recovery equipment has generally consisted of a combination of a recovery tank and a centrifugal pump.
Drainage is extracted from the pipe/inside using a small cuff III-" and collected in a tank, and a centrifugal pump that is linked to the liquid level adjustment in the tank is used to send the collected drainage in the tank to the wastewater treatment equipment. In this case, the following items must be taken into account: is necessarily required.

(1) Tanks, pumps, piping equipment connected to them, and the space they occupy, as well as semi-underground priming equipment for the initial operation of the pumps.

(2) Laying the electric cable for the pump drive device.

(3) If in an explosion-proof area, use more sophisticated pumps, etc.

However, the above-mentioned matters become a major factor in increasing costs in cases where the distance for transporting gas or condensate in pipes is long and there are many locations for recovering condensate, such as in offshore oil storage bases.

Purpose of the Invention This invention was made in view of the above-mentioned circumstances, and it is possible to reduce the cost by omitting incidental equipment such as pumps, and to collect drain and use it in a rational manner. The purpose is to provide a drain recovery tank that can be sent to wastewater treatment equipment.

Structure of the Invention The condensate recovery tank according to the present invention is provided with an air bag for extruding liquid, which expands and contracts when air is taken in and out, inside a tank body for storing condensate.

The beautiful fruit of this invention! ! In embodiments, the bladder is bellows-shaped and has a buoyancy chamber at its lower end and one or more perforated bases at its sides.

The condensate recovery tank according to the present invention is generally used in offshore oil storage bases to prevent the supply of non-flammable gas and to reduce the amount of crude oil gas.
Each of the 11 exit pipes is staged within the trend or above the dolphin of the lowermost pipe of L and the land road crossing section.

Embodiments and Effects Hereinafter, embodiment J and effects of the present invention will be explained in detail with reference to the drawings.

1 and 2, the condensate recovery tank according to the present invention consists of a tank body (1) for storing drain, and an air bag (2) provided inside the tank body for extruding liquid. The tank body (1) is made of steel and consists of a right bottom cylindrical body (4) having legs (3), and an inverted bowl-shaped lid body (5) placed on top of the body (4). The body (4) has a connection part (6) for a drain inlet/output pipe at the bottom, a pair of upper and lower connection parts (7) and (8) for a liquid level detection pipe at the - side, and an exhaust pipe at the other side. The lid body (5) has a connection part (9) on the right side and a flange (11) on the end thereof, and the lid body (5) has a connection part (12) for the air inlet and outlet pipe on the top.
and has a flange (13) at the lower end. and -F
The lower pair of flanges (13) and (12) are tightened with bolts and nuts (14) through the flange (15) of the air bag (described later) between them, thereby forming the body (4) and the lid body (5). are integrated to form the tank body (1). On the other hand, the air bag (2) is made of rubber, has a bellows shape that opens upward, and has a flange (15) at the upper end.
It has a buoyancy chamber (11) filled with a buoyancy material (16) such as foamed steel at the lower end, and each valley of the bellows and the buoyancy chamber (17) has an outwardly projecting shape. spacer (
18), and each spacer (18) is provided with a number of ventilation holes (19). Since the air bag (2) has a bellows shape, air pressure is evenly applied to the entire liquid surface when draining drain.

Furthermore, by re-installing the buoyancy chamber (17), the air bag (2) receives a large buoyancy force and is easily deflated. Furthermore, the spacer
The tank body (
Drainage etc. that have entered the gap between 1) and the air bag (2) can easily flow out. The air bag (2) is arranged inside the body (4) such that the outer peripheral edge of the spacer (18) is in contact with the inner peripheral surface of the body (4) of the tank body (1), and the flange (15)
is a pair of upper and lower flanges (13) of the tank body (1) (
Tank body (1) by being held between
It is fixed in a suspended manner to the lid body (5) and communicates with the air inlet/outlet pipe through the inside of the lid body (5).

Thus, a condensate recovery tank (10) according to the invention is constructed.

Next, the operation of the condensate recovery tank according to the present invention will be explained.

In Figure 3 a3 and Figure 4, the nonflammable gas supply pipe (
20) and the drain generated inside the crude oil gas discharge pipe (21) is taken out by the drain pipes (22) and (23), and after the gas is removed by Rough Flap 4) (25), ), the drain inlet/outlet pipe (26) is introduced into the tank body (1) with a sieve. Trap (24) <
25)''C The separated gases are sent to the gas return pipes (2
7) Returned to the original tube (20) (, 21) by (28). A small amount of gas generated during the recovery of the air drain in the tank body (1) passes through the vent hole (19) of the spacer (18) of the air bag (2) and enters the activated carbon enclosure ( 53) and is discharged from the exhaust pipe (29).The rice whistle (29) is located at a high exhaust point so that the gas can be effectively diffused into the exhaust pipe (29).

The drain that has flowed into the tank body (1) is shown in Figure 4 (0).
As shown in , the buoyancy chamber (17) of the air bag (2) is gradually pushed up, and the air inside the air bag (2) flows through the air inlet/output pipe (3).
0).

When the liquid level in the drain reaches the highest liquid level (corresponding to when the air bag (2) is most contracted), the liquid level detection tube (3
The high alarm of one liquid level 1t (51) provided in 1) is activated.

When the high alarm of the liquid level gauge (51) is activated, the flow of condensate into the tank body (1), the discharge of air from the tank body (1) (13) and the discharge of air from the air bag (2) are stopped. The plant air in the air pipe (32) is
As shown in Figure (C), air is injected into the air bag (2) through the air inlet/output pipe (30), and the air bag (2) gradually expands in the f direction, thereby causing the tank body (1) to Drain retained within is pressurized and returned to the oil-containing water pipe (34) through the drain in/out pipe (26) and the drain return pipe (33),
The oil is sent to the recovery oil tank (56).

The air bladder (2) is filled with air and inflated to its maximum capacity, and the fourth
As shown in Figure (d), once most of the drain in the tank body (1) has been pushed out, the supply of air to the air bag (2) and the discharge of drain from the tank body (1) must be stopped. As shown in Fig. 4 (e), the air inside the tank body (1) is exhausted through the exhaust pipe (29), and the air inside the air bag (2) is exhausted through the exhaust pipe (35). be given As a result, the air bag (2) is deflated and the air bag (2)
Drain, etc. that has entered the gap between the tank body (1) and the tank body (1) flows down to the bottom of the tank body (1) through the vent hole (19) of the spacer (18).

In this way, one cycle of drain recovery is completed, and the same cycle is repeated thereafter.

In addition, in Figures 3 and 4 - C1 manual valve (3G)
(37) (38) (39) (40) (41)
(42), (43), (44), and (45) are all used at all times, and all valves other than solenoid valves (4G>
47) (48), (49), and (50) are all air-driven, and are opened and closed by the liquid level gauge (51) in the drain recovery tank and the on-site control panel (52). There is. The supply of air to the air bag (2) is controlled by calculating the capacity of the tank body (1) and using a time switch. (54)
(55) and (56) are check valves.

Effects of the Invention The condensate recovery tank according to the present invention is equipped with an air bag for extruding liquid that expands and contracts when air is taken in and out, inside the tank body for storing condensate. The structure can be simplified by omitting equipment. In addition, the tank is easy to handle and there is no risk of failure, and not only the space for pumps and other installations can be omitted, resulting in cost savings. Furthermore, since this tank has almost no electrical monitoring equipment, it can be used extremely safely even in explosion-proof areas. Moreover, by installing an air bag, it is possible to prevent direct contact with the air for pushing out the condensed liquid.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view of the condensate recovery tank, Figure 2 is a sectional view taken along line ll-Tl in Figure 1, and Figure 3 is a diagram of the condensate recovery system using the condensate recovery tank. System diagram, Figures 4 (A), (B), (C), (D), and (E) are schematic diagrams showing the operating status of the condensate recovery tank. (1) Tank body, (2)... air bladder, (4)
...Body, (5)...Embody, (10)...Condensate recovery tank, (17)...Buoyancy chamber, (18)...Spacer, (19)...Vent hole . 4 people other than the above procedure amendment band 1. Indication of the case
429 No. 2, Title of the invention Condensate recovery tank 3, Relationship to the person making the amendment Nj' + Applicant's address 1-6-14, Edobori, Nishi-ku, Osaka Name/Name (511) Hitachi Zosen Corporation 4, Agent Address: 57-6, Mataya Nishinocho, Minami-ku, Osaka, 6th floor, 5th floor, Inaba Building, weight of amendment order: Showa 41' Month 116
, Number of inventions increased by amendment 7, Target of amendment Detailed explanation of the invention in the specification and content of amendment to the drawings (1) ``Use'' in line 3 on page 4 of the specification is corrected to ``specification''. (2) 3 lines from the bottom of page 6 r (r 13J Qll
Correct to J. (3) Change the two lines from the bottom of page 9 “Air inlet/output pipe ■” to “Exhaust pipe ω
” is corrected. (4) Figures 3 and 4 are corrected as shown in the attached sheet. that's all

Claims (4)

[Claims] (1) A condensate recovery tank in which an air bag for extruding liquid that contracts when air is taken in and out is installed inside the tank body that collects condensate. (2) The tank according to claim 1, wherein the air bag has a bellows shape. (3) The tank according to claim 1 or 2, wherein the air bladder has a buoyancy chamber at the lower end. (4) The tank according to any one of claims 1 to 3, wherein the air bladder has one or more perforated spacers on its side.