JPH0116484Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for separating drain water generated in a crude oil tank, a crude oil refined product tank, etc. from stored liquid and discharging it.

It is not desirable for product management to have impurities mixed into tanks that store storage liquids such as crude oil or crude oil refined products, but rainwater may enter the tank and accumulate at the bottom due to the difference in specific gravity with the stored liquid. However, the formation of drain water is often observed. This drain water causes various problems in tank operation, so it is desirable to completely remove it.

Previously, the water intake pipe and the drain pipe were connected inside and outside the storage tank, and only the drain water was discharged to the outside due to the difference in tank water head, but the water intake port of the water intake pipe was located above the bottom plate of the tank. Because of this, it was impossible to drain the drain water near the bottom plate.

Furthermore, the sludge deposited on the bottom plate cannot be removed, and within a long period of time, the sludge becomes stuck to the lower part of the bottom plate and side plates, making it even more difficult to remove.

Furthermore, there is no prior art that can solve both the problems caused by drain water and sludge.

Furthermore, Japanese Utility Model Publication No. 15270/1973 was devised as a technology for separating and discharging impurities in heavy oil.

This is a tank body 1 which is partitioned into an upper heavy oil chamber 4 and a lower settling chamber 5 by a leak-shaped partition wall 2, and a flow outlet 3 is provided at the lower end of the partition wall 2. When heavy oil is put into the tank body 1, impurities contained in the heavy oil settle and are accommodated in the settling chamber 5 through the outlet 3 of the partition wall 2. The cleaned heavy oil in the heavy oil chamber 4 is then sent out from the outflow pipe 11.

However, with this technique, it is not possible to confirm the amount of impurities contained in the precipitation chamber 5. Therefore, if the amount is continuously discharged at a stage where the amount is small, heavy oil will also be discharged together with impurities.
Furthermore, if the amount of impurities overflows in the settling chamber 5, even if there is a guide plate 6 and a flow blocking plate 9, the impurities may flow back into the heavy oil chamber 4, and the impurities are sent out from the outflow pipe 11 along with the purified heavy oil. It may happen.

In view of the conventional drain water and sludge discharge techniques described above, the applicant of the present application has proposed an effective drain water separation and discharge device as U.S. Pat.

That is, the gist is as shown in FIG. 1, a water suction nozzle 2 having a unidirectional water suction port installed on the bottom plate of a known storage tank 1, and a water suction nozzle 2 that is curved along the side plate of the tank 1 and sealed at the tip. An injection pipe 3 having a plurality of injection ports inclined in the opposite direction to the absorption port is connected to a separation tank 6 installed outside the tank 1 through pipes 4 and 5, respectively, and drain water is separated in the tank 6. The stored liquid can be supplied to the injection pipe 3, and the water absorption nozzle 2 absorbs the mixed liquid of the stored liquid and drain water and sends it to the separation tank 6, where the stored liquid, drain water, and sludge are separated. The drain water and sludge are discharged separately from the lower part of the tank 6, and the stored liquid is supplied to the injection pipe 3 through the pipe 5,
The stored liquid is injected from each injection port of the injection pipe 3 to stir the stored liquid, drain water, sludge, etc., and the mixed liquid is sent to the separation tank 6, where it is separated and discharged in the same manner as described above.

The object of the present invention is to provide a drain water separation and discharge device that is an improved separation tank in the above-mentioned separation and discharge device, and one embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 2, reference numeral 10 indicates a separation tank used in the separation and discharge apparatus of the present invention.

This separation tank 10 may be either cylindrical or rectangular, and inside it is a silo-type separation member 11.
It is divided into an upper chamber 12 and a lower chamber 13. The opening 11 is located around the upper end of the separation member 11 and at the center of the bottom.
a, 11b, and upper and lower chambers 12, 13 are able to circulate.

The lower chamber 13 has a structure in which the sludge can be collected at the center, and a sludge discharge port 14 is provided in the center thereof, and a drain water discharge pipe 15 is connected to the lower chamber 13.

The inclination angle of the separation member 11 may be designed in accordance with the stored liquid to be handled, and the opening area of the bottom may be determined in the same manner.

Piping 16 connected to upper chamber 12 of separation tank 10
is connected to an absorption nozzle disposed in the conventional storage tank (not shown) and is directly connected to a pipe 18 connected to the lower chamber 13, and furthermore, this pipe 16 is connected to a pipe 19 independently connected to the storage tank. There is.

A pipe 17 connected to the upper chamber 12 is connected to an injection pipe in the storage tank, and check valves 20 and 21 are provided on this pipe 17 and the pipe 19, respectively.

The interior of the lower chamber 13 is divided by a plurality of partition plates 22 arranged in the radial direction. This is carried out from the mixed liquid circulating in the upper chamber 12 to the lower chamber 1.
This is to prevent the circulation of drain water flowing into the lower chamber 13 and damage to the water-oil interface level meter 23 installed in the lower chamber 13. It also prevents level changes due to wave generation and enables stable measurement. be.

A space is formed between the lower end of each partition plate 22 and the bottom plate of the separation tank 10, and can be cleaned using, for example, a steam blowing pipe.

In addition, the symbols 24 and 25 indicate the drain water discharge pipe 1.
5 and piping 18, respectively.

The present invention has the above configuration, and when the separation and discharge device is in operation, the piping 17 between the storage tank and the separation tank 10
The mixed liquid of the storage liquid, drain water, and sludge in the storage tank is sucked through the absorption nozzle by a pump (not shown) installed in the separation tank 10.
into the upper chamber 12. In the upper chamber 12, the mixed liquid is separated into the storage liquid, drain water, and sludge due to the rotational flow and the difference in specific gravity, and the storage liquid floating above the upper chamber 12 is sent from the pipe 17 to the injection pipe of the storage tank. Further, the drain water and sludge overflow and/or settle through the outlet from the upper chamber 12 to the lower chamber 13, that is, through the upper annular opening 11a and the bottom opening 11b of the separation member 11, from there to the lower chamber 13 and stored.

The level of drain water accumulated in the lower chamber 13 is sensed by the level meter 23 mentioned above, and when this level reaches a higher level than the upper level meter 23A, a command to open the automatic valve 24 is activated, and the discharge pipe 15 is opened and closed. The drain water is automatically discharged by opening the valve, and the sludge accumulated at the bottom is discharged by visual inspection or other conventional methods, and by opening and closing the discharge port 14 as appropriate.

The check valve 20 prevents liquid from flowing back into the separation tank 10 from the storage tank when the system is not in operation. Also, check valve 21
When the device is not operating, the automatic valve 25 is operated to communicate with the storage tank in the pipe 18, and only the drain water stored at the bottom of the storage tank in a stationary state is absorbed into the lower chamber 13 through the pipe 18. It has a function.

As described above, the inside of the separation tank 10 is divided into upper chambers 12 and 13 by the silo type separation member 11,
The lower chamber 13, which mainly accommodates and manages drain water and sludge, can be adjusted together with the attached piping to adjust the liquid to be collected into the storage tank, so that the drain water and sludge can be stored in the lower chamber 13 and used as storage liquid. separation is well done. Moreover, only the stored liquid can be injected back into the storage tank from the injection pipe through the pipe 17.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a conventional drain water separation and discharge device, and FIG. 2 is a schematic sectional view of a separation tank used in the separation and discharge device of the present invention. 1 is a storage tank, 2 is a water absorption nozzle, 3 is an injection pipe, 10 is a separation tank, 11 is a separation member, 12 is an upper tank, 13 is a lower tank part, 14 is a sludge discharge port, 15 is a discharge pipe, 16, 17 ,18,1
9 is piping, 20 and 21 are check valves, 22 is a plate, and 23 is a water-oil interface level meter.

Claims (1)

[Scope of utility model registration request] The mixed liquid of the stored liquid, drain water, and sludge in the storage tank is separated into the stored liquid, drain water, and sludge in a separation tank, and the drain water and sludge are discharged, and the stored liquid is returned to the storage tank and circulated. In the drain water separation and discharge device, the inside of the separation tank 10 is divided into an upper chamber 12 and a lower chamber 13 by a silo-type separation member 11 so as to be able to flow, and a pipe 16 connected to the upper chamber 12 is connected to the storage tank. connected to the nozzle and also to the upper chamber 12;
The pipes 17 each having a check valve 20 are connected to the injection ports of the storage tank, and the lower chamber 13, which is internally partitioned into a plurality of parts, is provided with a sludge discharge port 14 and is connected to a drain discharge pipe 15 having an automatic valve 24. A drain water separation and discharge device characterized in that it is capable of automatically discharging drain water and sludge by sensing the water level.