JPH0123996Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sludge treatment device that efficiently treats sludge that has settled and accumulated at the inner bottom of a floating roof type tank.

In floating roof tanks for storing crude oil, etc., when crude oil, etc. is stored for a long period of time, it is inevitable that sludge, which is mainly composed of impurities in the oil, will settle and accumulate.

Such sludge accumulation at the bottom of the tank is a major cause of corrosion inside the tank, and the cleaning work performed during periodic tank opening inspections, which is now mandatory, is a complicated and troublesome process with many steps, making the work difficult. There are drawbacks such as increased cost.

Furthermore, since sludge accumulation also causes a decrease in the effective storage capacity in the tank, a method for efficiently disposing of sludge has long been desired.

For this reason, conventionally tanks are equipped with a stirrer, and crude oil, etc. is stirred by stirring blades that rotate inside the tank to prevent the sludge in the oil from settling. Since these are large, with a diameter of, for example, 80 m, it has not been possible to sufficiently prevent sludge sedimentation by simply stirring the crude oil or the like.

A conventional method for solving these problems is disclosed in Japanese Patent Publication No. 14557/1983.

This device is constructed by installing multiple distribution pipes with ejection holes at the bottom of the storage tank, and connecting each distribution pipe to the discharge pipe of the circulation pump via a switching mechanism that intermittently supplies circulating fluid. It is something.

However, with such conventional systems, it is necessary to separately prepare circulating fluid injection means, that is, install multiple distribution pipes dedicated to sludge treatment in the storage tank, and especially in large tanks, it is necessary to adjust the circulating fluid injection pressure to the tank. In order to act over almost the entire area, it is necessary to prepare a considerable number of the above-mentioned distribution pipes, which requires complicated equipment and is disadvantageous in terms of cost.

Furthermore, a conventional technique disclosed in Japanese Patent Application Laid-open No. 54-3913 is known.

This is a floating roof type tank in which a hollow part is formed in the floating roof support and a spout is provided through which liquid can be spouted into the tank chamber.

However, as stated in the official gazette, this conventional example is basically configured to squirt a liquid different from the liquid stored in the tank into the tank when the tank is not in use. If a so-called permanent treatment of precipitates is attempted, in which the same liquid as the stored material is jetted into the tank while using the tank, the following problems arise.

That is, for example, if the tank is 20,000 to 30,000 tons, the floating roof will be moved up and down once a month.
Since the floating roof is near the bottom of the tank, it is possible to dispose of the sediment by ejecting a jet at that time, but if piping is to be installed each time to guide the fluid into the hollow part of the floating roof support, it is necessary to prepare This requires a huge amount of effort, complicated and troublesome work. In addition, if the piping that leads the fluid to the hollow part of the floating roof support is fixed to the tank side in advance, a through hole for the fixed piping is provided in the floating roof so as not to impede the vertical movement of the floating roof. It is necessary to consider the sealing mechanism between the through hole and the fixed pipe, and in this case,
The structure becomes complicated, resulting in problems that are disadvantageous in terms of cost.

Therefore, in view of the above-mentioned conventional circumstances, the present invention was developed to provide a floating roof type tank equipped with a plurality of floating roof supports each having a spout that can spout liquid from a hollow part toward the inner bottom surface of the tank. In the sludge treatment equipment, the liquid for treating the settled sludge at the bottom of the tank is pumped into the hollow part through a drain discharge pipe that follows the vertical movement of the floating roof and discharges rainwater etc. accumulated on the floating roof to the outside. The object of the present invention is to provide a sludge treatment device in a floating roof type tank, which promptly solves various problems of the conventional method by providing a liquid inlet for pumping liquid to the floating roof support.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 6.

In FIGS. 1A and 1B, 1 is a floating roof type tank body for storing crude oil, heavy oil, gasoline, and other volatile liquids. For example, a floating roof 3 that operates by following the liquid level of crude oil 2 is installed.

In this floating roof 3, floating roof support holes 4 having a diameter of, for example, about 100 mm are formed at many locations, for example, 150 to 180, substantially uniformly as shown in FIG. 1A.

As shown in FIG. 2, the structure of the floating roof support hole 4 is as shown in FIG.
are fitted and fixed by welding means, etc., and a floating roof support 7 is inserted into each cylinder frame member 6, and the length of the floating roof support 7 is set to the inward protrusion length h of the floating roof 3. 7 is attached to the cylinder frame member 6 by a pin 8 that passes through this and the cylinder frame member 6 from the side.

9 is a support gasket press-fitted into the gap between the outer peripheral surface of the floating roof support 7 and the inner peripheral surface of the upper end of the cylinder frame member 6, and 10 is a rolling ladder that spans from the upper end of the tank body 1 to the upper end surface of the floating roof 3. It is.

In such a floating roof type tank, in the present invention, a hollow part is formed in the floating roof support, and a liquid inlet for transporting the settled sludge at the bottom of the tank is pumped into the hollow part, and a liquid inlet for transporting the settled sludge at the bottom of the tank is provided. A spout for spouting liquid toward the inner bottom surface of the tank is provided on each floating roof support, and a sludge discharge port is provided on the tank.

That is, in the embodiment shown in FIG. 2, the floating roof support 7 itself is formed of a hollow body, and a liquid inlet 7A communicating with the inner space of the support 7 is provided on the outer periphery of the upper end of the support 7 made of the hollow body. At the same time, a liquid spout 7B is provided on the outer periphery of the lower end of the floating roof support 7 to communicate with the internal space of the support 7. A pipe 7C having a diameter that allows the pin 8 to be inserted and removed is fitted and fixed between the inner walls of the floating roof support 7 through which the pin 8 penetrates, and a lid plate 7D and a bottom plate 7E are provided at the upper and lower ends of the support 7, respectively. The arrangement is fixed and the support 7
The hollow portion inside is prevented from communicating with the outside except through the liquid inlet 7A and the liquid spout 7B.

The liquid spout 7B is composed of a nozzle 11 that projects downwardly from the outer circumferential wall of the floating roof support 7, as shown in FIG. A sludge discharge port 12 is provided on the outer periphery of the lower end of the tank body 1 as shown in FIG.
is directed in the direction of

The tip opening 11A of the nozzle 11 is, for example, the fourth
As shown in Figures A and B, it is formed in the shape of a long hole that expands laterally. In addition, a valve is provided at the outer opening of the liquid inlet 7A, and a coupling ring (not shown) for freely connecting a high-pressure rubber hose 14, which will be described later, is provided at the tip of the valve. , the valve is closed.

In addition, 7F is a handle.

When the liquid to be pumped into the floating roof support 7 is stored in the tank body 1, crude oil is used, and a drain discharge piping 22 shown in FIG. Crude oil is supplied to the floating roof support 7 via a high pressure rubber hose 14 that can be connected to the floating roof support 7 and is connected to the liquid inlet 7A.
to be pumped inside. This drain discharge pipe 22 has a drain intake port 23 that opens at one end on the upper surface of the floating roof 3.
A coupling ring is provided which is opened inside and detachably connects to the high-pressure rubber hose 14, and the other end is opened to the outside of the tank body 1 below as a drain outlet 24. And this drain discharge pipe 22
As is well known, the floating roof 3 has a function of following the vertical movement of the floating roof 3 using a swivel joint or the like to discharge rainwater etc. accumulated on the floating roof 3 to the outside. The drain intake port 23 of the drain discharge pipe 22 and the liquid inlet 7A of the floating roof support 7 are connected via a high pressure rubber hose 14.

Next, the operation of this configuration will be explained.

Most of the crude oil in the tank body 1 is consumed, and as a result, the floating roof 3 descends, and the lower end of the floating roof support 7 comes into contact with the inner bottom surface of the tank body 1.

Therefore, it is necessary to discharge the sludge that has settled and accumulated on the inner bottom surface of the tank body 1, but when sweeping the sludge by the liquid jet pressure from the liquid jet port 7B of the floating roof support 7, it is contrary to the sludge discharge port 12. The crude oil is sequentially pumped from a floating roof support 7 located at an appropriate location on the side where the sludge is discharged to a floating roof support 7 located at an appropriate location on the side of the sludge discharge port 12.

That is, first, crude oil is pumped from the liquid inlet 7A via the drain discharge pipe 22 and the high pressure rubber hose 14 to the plurality of floating roof supports 7 around the inside of the tank body 1 located on the side opposite to the sludge discharge port 12. .

The crude oil pumped into each floating roof support 7 is injected from each liquid spout 7B toward the inner bottom surface of the tank body 1, and the injection pressure of this crude oil causes the sludge deposited on the inner bottom surface of the tank body 1 to become sludge. Move closer to the discharge port 12.

If the crude oil is pumped from the plurality of floating roof supports 7 around the inside of the tank body 1 to the floating roof support 7 on the sludge discharge port 12 side while changing the number of supports 7 sequentially, the sludge on the inside bottom of the tank body 1 is The sludge is swept in one direction toward the sludge discharge port 12.

Here, the sludge is discharged to the outside of the tank body 1 by opening the sludge discharge port 12 and suctioning it with a suction means such as a pump (not shown).

According to this configuration, the sludge that has settled and accumulated on the inner bottom surface of the tank body 1 is efficiently swept toward the sludge discharge port 12 and discharged to the outside by the liquid jet pressure. It is possible to eliminate all the disadvantages caused by the precipitation of sludge. That is, tank body 1
A major cause of corrosion can be removed, and cleaning work during an open inspection inside the tank body 1 can be carried out extremely easily since there is no sludge, thereby reducing the number of work steps and work costs. Furthermore, the effective storage capacity within the tank body 1 is not reduced.

Furthermore, according to the above configuration, the floating roof supports 7 provided in large number at close intervals over substantially the entire area of the floating roof 3 are used, that is, the liquid inlet 7A and the spout 7B are provided in the floating roof support 7. Since it is set in advance, the liquid jet pressure can be applied to almost the entire area of the inner bottom surface of the tank body 1, and even in a large tank, the sludge can be reliably delivered to the sludge discharge port 1.
You can sweep it up to 2.

Also, if you go to the trouble of preparing a liquid/spraying means separately,
There is no need to attach this to the floating roof 3 separately from the floating roof support 7, or to replace it with the support 7 in the support hole 4 etc. each time to apply liquid injection pressure, eliminating the need for troublesome and time-consuming work. This has the advantage of

Incidentally, in the case where the liquid injection means is used by replacing the floating roof support 7, the replacement work becomes extremely time-consuming and troublesome in a vast tank.

Furthermore, according to this configuration, the liquid for treating settled sludge is pumped into the hollow part of the floating roof support 7 by using the drain discharge pipe 22 that follows the vertical movement of the floating roof 3 by means of a swivel joint or the like. Because of this, there is no need to prepare piping for supplying liquid for treating settled sludge every time settled sludge is processed, and there is no need for complicated and troublesome work.
It is possible to permanently treat the precipitate by jetting the same liquid as the stored material into the tank while using the tank. In addition, a through hole for the fixed piping is provided in the floating roof so as not to impede the vertical movement of the floating roof, such as when the piping that leads the liquid to the hollow part of the floating roof support 7 is fixed to the tank side in advance. There is no need to consider the sealing mechanism between the hole and the fixed pipe, and the structure can be simplified and cost-effective.

In addition, according to the above configuration, since the drain discharge pipe 22, which is an essential structure in a floating roof tank, is used, there is no need to provide any new pipe for pumping liquid apart from the floating roof 3, and the equipment This is extremely advantageous.

Furthermore, since the drain discharge pipe 22 passes through a room surrounded by the tank body 1 and the floating roof 3, if the liquid for sludge treatment is heated and sent to the floating roof support 7. In this case, the heat radiated from the drain discharge pipe 22 is directly collected into the chamber and heats the sludge treatment liquid and sludge, so there is an advantage that there is little heat loss and effective sludge treatment can be performed.

It should be noted that the floating roof support does not need to be constructed entirely of a hollow body; instead, a cylindrical floating roof support 17 is adopted as shown in FIG. 19 may be formed, and this hollow portion 19 may be provided in communication with the liquid inlet and the ejection port. In this case, the spout is installed inside the support 17 by being attached to the lower surface of the partition wall 18 on the lower side of the support 17, and the tip opening faces into the tank body 1 from the opening 17A of the lower end wall of the support 17. It may also be configured with a nozzle 20.

This nozzle 20 is also formed in the shape of a long hole that widens laterally, as shown in FIG.

In such embodiments, the floating roof support 17
Since the nozzle 20 does not protrude from the outer circumferential surface, it is convenient to remove the floating roof support 17 from the cylindrical member 6 of the floating roof 3 for maintenance, and a powerful jet of fluid to move the sludge is provided. Nozzle 2 capable of generating pressure
0, it has the advantage that sludge treatment can be performed more thoroughly.

Furthermore, if a baffle box 21 for guiding sludge is connected to the sludge discharge port 12, as shown in FIG. good.

This buffful box 21 has a sludge discharge port 1.
2, and has an opening 21A on the widening end face, and also has a plurality of buttful plates 21B inside thereof so as to expand from a position facing the sludge discharge port 12 toward the opening 21A surface. The sludge swept up by the liquid injection pressure is transferred between the buffle plate 21B and the buffle box 21.
The sludge can be smoothly guided to the sludge discharge port 12 by passing between the sludge and the inner surface.

Note that this sludge discharge port 12 may not be newly provided and may also be used as a spout for the stored liquid. In addition, the outer opening of the liquid inlet 7A of the floating roof support is not provided with a valve or a coupling ring, but is simply kept airtightly closed at all times with a stopper such as a plug, cap, or blind flange. To clean the sludge deposited on top, remove the plug and open the liquid inlet 7.
A and the high pressure rubber hose 14 may be connected.

As explained above, in this invention, the liquid inlet and the spout are integrated in advance in the floating roof supports, which are provided in large numbers over almost the entire area of the floating roof, so even if the tank is large, The liquid injection pressure can be applied over almost the entire bottom surface of the tank, and the sludge can be reliably swept to the sludge outlet and discharged, ensuring thorough sludge treatment and preventing corrosion inside the tank due to sludge accumulation. This makes it possible to eliminate the factors, facilitate cleaning work during tank open inspection, and prevent a decrease in the tank's effective storage capacity. In addition, by providing the liquid inlet and spout in advance on the floating roof support, there is no need to attach separately prepared liquid jetting means to the floating roof each time as in the past.
It does not require extremely troublesome and labor-intensive work, and is extremely effective for tanks with a vast inner bottom surface. In particular, according to the present invention, the liquid for treating settled sludge is transferred to the floating roof by using a drain discharge pipe that follows the vertical movement of the floating roof and discharges rainwater etc. accumulated on the floating roof to the outside. Since the liquid is fed under pressure into the hollow part of the support, there is no need to prepare piping for supplying the liquid for processing the settled sludge every time the settled sludge is processed, which eliminates the need for complicated and troublesome work, and makes it easier to remove the tank. The settling sludge can be treated permanently during use. In addition, in cases where the piping that leads the liquid to the hollow part of the floating roof support is fixed in advance to the tank side, a through hole for the fixed piping is provided in the floating roof so as not to impede the vertical movement of the floating roof, and the through hole is connected to the through hole. There is no need to consider a sealing mechanism with fixed piping, the structure can be simplified, and it can be advantageous in terms of cost. In addition, since the drain discharge piping, which is an essential structure in a floating roof tank, is used, there is no need to install any new piping for pumping liquid apart from the floating roof, and the equipment can be simplified. This has great practical effects and is advantageous in terms of cost.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a schematic configuration of a sludge treatment device in a floating roof tank according to the present invention, where A is a plan view of the floating roof tank, B is a front vertical sectional view, and Figure 2 is a diagram of the floating roof support. A front view showing the structure, FIG. 3 is an enlarged longitudinal cross-sectional view of the lower part of the same support, and FIG. 4 is a view showing an embodiment of the liquid spout, A is a plan view, B is a side view, and FIG. 5 is a floating FIG. 6 is a longitudinal cross-sectional view showing another embodiment of the roof support, and FIG. 6 is a diagram showing an embodiment of the sludge discharge port, in which A is a front view and B is a plan view. 1...Tank body, 3...Floating roof, 7...Floating roof support, 7A...Liquid inlet, 7B...Liquid spout, 13...Liquid pressure feeding piping, 14...High pressure rubber hose, 17...Floating Roof support, 22...Drain discharge piping, 23...Drain intake, 24...
...Drain outlet.

Claims (1)

[Claims for Utility Model Registration] (1) A spout that is inserted and supported by the floating roof of a floating roof tank, has a hollow part, and can spout liquid from the hollow part toward the inner bottom of the tank. In a sludge treatment device in a floating roof tank equipped with a plurality of floating roof supports, one end is open to the upper surface of the floating roof, the other end is opened to the outside below the tank body, and the sludge treatment device follows the up and down movement of the floating roof. A liquid inlet is provided on the floating roof support to force the liquid for treating the settled sludge at the bottom of the tank to the hollow part through a drain discharge pipe for discharging rainwater etc. accumulated on the floating roof to the outside. This is a sludge processing equipment inside a floating roof tank. (2) The liquid spout is installed inside the support by being attached to the lower end surface of the partition wall for forming a hollow partition provided at the lower end of the cylindrical floating roof support, and the opening at the tip is located inside the support at the lower end wall of the support. A sludge treatment device in a floating roof tank according to claim 1, which is a nozzle that faces into the tank from an opening. (3) The sludge treatment device in a floating roof tank according to claim 2, wherein the tip opening of the nozzle is formed in the shape of a long hole that widens laterally.