JP4084184B2 - Cascade tank unit and boiler water supply system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a cascade tank unit that is installed in a ship, for example, condenses steam after heating fuel for a main engine and a diesel generator, and supplies water to a boiler, and a boiler water supply system including the cascade tank unit About.
[0002]
[Prior art]
In a ship, a fuel tank in a main engine and a diesel generator, and fuel before being injected into the main engine and the diesel generator are heated by steam generated by a boiler using exhaust gas as a heat source. On the other hand, as shown in FIG. 7, the steam and drain after use are led to a condenser 1 in a ship to which cooling water, which is seawater, is supplied, and cooled and condensed. The obtained condensed water is collected into the cascade tank 3 through the condensed water piping 2 in the ship together with the drain. The cascade tank is also called an atmospheric pressure drain tank or an atmospheric pressure tank.
[0003]
In the cascade tank 3, a sponge 4 for removing oil contained in the condensed water is provided and a weir is provided. The condensed water injected into the cascade tank 3 passes over the sponge 4 and the weir. The oil component is removed and only condensed water is discharged from the cascade tank 3. An outlet pipe 5 is connected to the outlet of the cascade tank 3, and the outlet pipe 5 is connected to the suction ports of the first water supply pump 6 and the second water supply pump 7 via valves 5a and 5b after branching. Yes. Here, the first feed water pump 6 and the second feed water pump 7 are the same pump, and normally only one pump is operated, and when the pump in operation fails, the other pump is operated. ing. The discharge side pipes 8a and 8b connected to the discharge ports of the first water supply pump 6 and the second water supply pump 7 are each connected to an auxiliary boiler. Therefore, the condensed water discharged from the cascade tank 3 is supplied to the auxiliary boiler by the first feed water pump 6 or the second feed water pump 7. 7 illustrates a state in which the valve 5a is opened and condensed water is supplied from the cascade tank 3 to the auxiliary boiler by the first water supply pump 6 (see, for example, Non-Patent Document 1).
[0004]
[Non-Patent Document 1]
"Marine Engine Planning Handbook" Corona, September 15, 1969, first edition, P818-819, Figures 1.5-1.8
[0005]
[Problems to be solved by the invention]
In recent years, the engine room has been reduced for the purpose of securing as much loading space as possible on ships, and in order to rationalize the outfitting at shipyards, the space saving of various devices has been screamed. As described above, with regard to the devices included in the fuel heating system, conventionally, the above-described condenser 1, cascade tank 3, and feed water pumps 6 and 7 are separately installed in the engine room. Therefore, conventionally, it is necessary to secure the respective installation spaces for installing the condenser 1, the cascade tank 3, and the feed water pumps 6 and 7, and the devices are arranged separately in this way. The space for the condensed water pipe 2 and the outlet pipe 5 is also required.
Therefore, in the fuel heating system in the ship, the current situation is that space saving is not progressing, and each device has to be installed separately, and the condensate water pipe 2 and the outlet pipe 5 are connected to each other. Since it has to be constructed, it is very time-consuming for the outfitting work at the shipyard.
The present invention has been made in order to solve such problems, and provides a cascade tank unit and a boiler water supply system including the cascade tank unit, which achieve space saving in the ship and rationalization of outfitting. The purpose is to do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows.
That is, the cascade tank unit of the first aspect of the present invention includes a condenser for condensing steam used in a ship,
A cascade tank that attaches the condenser and removes impurities from the condensed water supplied from the condenser;
Attached to pump mounting surface along the vertical direction definitive in the cascade tank, a water supply pump for supplying water to the condensed water from the cascade tank to the boiler for generating the steam, and the driving source and the pump impeller of the pump An impeller drive shaft for connecting the pump is disposed along the vertical direction, and the drive source is disposed above the impeller in the pump in the vertical direction, and the drive source is not supported by the pump mounting surface. A pump,
With
The condenser is attached to a condenser attachment position located diagonally across the cascade tank with respect to the feed pump attached to the pump attachment surface, which is located at the upper part of the cascade tank.
It is characterized by that.
[0007]
The two water supply pumps may be mounted on the pump mounting surface so that the discharge ports of the respective pumps face each other and the side surfaces of the cascade tank are adjacent to the pump mounting surface.
[0008]
Furthermore, the condensed water outlet of the upper Symbol condenser is oriented in a vertical direction may be the condensed water is injected into the cascade tank at gravity.
[0010]
Furthermore, the condensed water is attached to the discharge side of the feed water pump, and the condensed water is supplied between the feed water pump and the cascade tank to prevent overheating of the feed water pump when the feed water of the condensed water to the boiler is shut off. You may make it further provide bypass piping which is the piping to circulate and returns the said condensed water discharged from the said water supply pump in the said cascade tank.
[0011]
The boiler water supply system according to the second aspect of the present invention includes the cascade tank unit according to the first aspect,
A steam pipe for guiding the steam generated in the boiler after use to the condenser provided in the cascade tank unit;
A condensed water supply pipe connected to a discharge side of a water supply pump provided in the cascade tank unit, and leading condensed water from the cascade tank provided in the cascade tank unit to the boiler;
It is provided with.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A cascade tank unit and a boiler water supply system including the cascade tank unit according to an embodiment of the present invention will be described below with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected about the same component.
As shown in FIGS. 1 to 3, the cascade tank unit 100 of the present embodiment includes a condenser 110, a cascade tank 120, and a feed water pump 140, and these components 110, 120, and 140 are integrated with each other. It is in a configured form and is installed, for example, in an engine room on the ship.
[0013]
As described above, the fuel tank in the main engine and the diesel generator in the ship and the fuel before being injected into the main engine and the diesel generator are heated by the steam generated by the boiler 240 using the exhaust gas as a heat source. The The condenser 110 is an atmospheric pressure condenser for condensing the steam after use, and a steam pipe 210 is installed in the ship at the steam inlet 111, the drain inlet 112, and the cooling water inlet / outlet 113 in the condenser 110. The drain pipe 220 and the cooling water pipe 250 are connected to each other. Therefore, the condenser 110 cools the used steam supplied through the steam pipe 210 and the steam supplied through the drain pipe 220 with seawater as cooling water supplied through the cooling water pipe 250. Condensate. The condensed water outlet 114 for discharging the obtained condensed water is provided in the condenser 110 so as to be oriented downward along the vertical direction.
[0014]
The condenser 110 configured in this way is located on the upper surface 121 of the cascade tank 120 having a box shape as shown in FIGS. 2 and 3 and on the side of the facing surface 123 facing the pump mounting surface 122 described later. Is attached to the cascade tank 120 at the condenser attachment position 116.
By installing the condenser 110 in the upper part 121 of the cascade tank 120 in this way, the condensed water is injected into the cascade tank 120 by free fall through the condensed water injection pipe 115 connected to the condensed water outlet 114. . With this configuration, the length of the condensed water injection pipe 115 can be reduced, and a pump or the like for supplying condensed water from the condenser 110 to the cascade tank 110 can be eliminated.
A drain branch pipe 118 that branches from the drain inlet 112 and is connected to the condensed water injection pipe 115 is connected to the drain inlet 112. Therefore, the condensed water discharged from the condenser 110 and the drain supplied through the drain pipe 220 and the drain branch pipe 118 are injected into the cascade tank 120 from the condensed water injection pipe 115. Here, not only the drain but also the condensed water discharged from the condenser 110 contains oil as impurities. In the following description, the condensed water discharged from the condenser 110 and the drain are combined into simply condensed water, and a reference numeral 117 is given.
[0015]
The cascade tank 120 has a box shape as described above, and impurities, such as oil, contained in the condensed water 117 injected from the condensed water injection pipe 115 as shown in FIG. A plurality of steel containers 124 with sponges to be removed and a weir are provided. The cascade tank 120 removes the impurities by passing the condensed water 117 injected into the inside from the upper part of the facing surface 123 through the plurality of containers 124 and the weir provided with the sponge, thereby removing the condensed water. Only 117 is discharged.
One side surface of the cascade tank 120 is the pump mounting surface 122, and the water supply pump 140 is mounted below the pump mounting surface 122. In addition, an outlet 125 for condensed water 117 is provided at a position near the mounting portion of the feed water pump 140 below the pump mounting surface 122. In order to secure the strength of the pump mounting surface 122 when the feed water pump 140 is mounted, reinforcing ribs are provided inside the tank on the pump mounting surface 122.
[0016]
In this way, the water supply pump 140 is attached to the lower part of the pump attachment surface 122, and the condenser 110 is attached to the condenser attachment position 116 on the facing surface 123 side in the upper part 121 of the cascade tank 120, thereby The condenser 110 is disposed diagonally across the cascade tank 120. With this arrangement, the cascade tank unit 100 can be balanced and stability can be increased. This is important in the cascade tank unit 100 installed on a swinging ship.
[0017]
In the present embodiment, the water supply pump 140 includes two units, a first water supply pump 140-1 and a second water supply pump 140-2. Both pumps 140-1 and 140-2 have the same capacity, and usually one of them operates, and when one becomes inoperable due to a failure or the like, the other operates. In addition, in FIG. 1, the case where the 1st feed water pump 140-1 is operated is shown in figure. Further, as shown in FIG. 3, the water supply pump 140 is a vertical type in which an impeller drive shaft 142 that connects a motor 141 that is a pump drive source and an impeller in the pump is arranged along the vertical direction. By adopting the vertical type, it is possible to install the pump on the pump mounting surface 122, and the installation space of the two pumps 140-1 and 140-2 can be reduced. The number of pumps is not limited to two.
[0018]
Suction side pipes 143-1 and 143-2 are connected to the suction ports of the first water supply pump 140-1 and the second water supply pump 140-2 from the respective condensed water discharge ports 125 in the cascade tank 120 through valves, respectively. Is done. Furthermore, in order to arrange the pump discharge side pipe 145 more compactly, as shown in FIG. 2, the first feed water pump 140-1 and the second feed water pump 140-2 have both pumps 140-1, 140-2. The discharge ports 144-1 and 144-2 are opposed to each other, and the two pumps 140-1 and 140-2 are horizontally adjacent to each other, and are attached to the pump mounting surface 122 of the cascade tank 120. In addition, due to such pump shape and arrangement, the rotation directions of the impellers of the first feed water pump 140-1 and the second feed water pump 140-2 are opposite to each other.
The discharge ports 144-1 and 144-2 are connected to pump discharge side pipes 145-1 and 145-2 (sometimes collectively referred to as "pump discharge side pipes 145") each having a valve. . The pump discharge side pipes 145-1 and 145-2 are connected to a condensed water supply pipe 230 that is piped in the ship and connected to the boiler 240.
[0019]
FIG. 1 is a piping diagram. In the cascade tank 120, the arrangement position of the first water supply pump 140-1 and the second water supply pump 140-2, the position of the outlet 125 for the condensed water 117, and the like are as follows. The arrangement and the arrangement shown in FIGS. 2 and 3 are different.
Further, in the present embodiment, as described above, the first water supply pump 140-1 and the second water supply pump 140- are used from the viewpoint of making the pump discharge side pipes 145-1 and 145-2 compact and facilitating the construction. The two discharge ports 144-1 and 144-2 are opposed to each other. However, the present invention is not limited to this configuration, and two water supply pumps of the same shape are attached to the pump attachment surface 122. Also good.
[0020]
Further, in the present embodiment, the first operation that occurs when the first water supply pump 140-1 or the second water supply pump 140-2 is operated even though the water supply inlet of the boiler 240 is closed. In order to prevent overheating of the first feed water pump 140-1 or the second feed water pump 140-2, bypass pipes 150, 150 are respectively provided between the pump discharge side pipes 145-1, 145-2 and the cascade tank 120. Provided. The bypass pipe 150 includes a check valve for preventing the backflow by flowing the condensed water 117 from the pump discharge side pipe 145 to the cascade tank 120, and an orifice for causing an appropriate pressure loss.
[0021]
By providing such a bypass pipe 150, even when the feed water pump of the boiler 240 is closed and the water supply pump is operated, the condensed water 117 having a flow rate sufficient to prevent the overheating is cascaded through the bypass pipe 150. It can be returned to the tank 120. Therefore, it can prevent that the 1st water supply pump 140-1 or the 2nd water supply pump 140-2 in operation is overheating.
In the present embodiment, the bypass pipe 150 is connected to the pump discharge side pipe 145 as described above for the purpose of being included in the cascade tank unit 100 to achieve compactness. However, the present invention is not limited to this configuration, and the condensate supply pipe 230 may be connected. 2 and 3 do not show the bypass pipe 150, and FIGS. 2 and 3 correspond to the form shown in FIG. 5 described later.
[0022]
According to the cascade tank unit 100 configured as described above, the condenser 110, the feed water pump 140, the piping between the condenser 110 and the cascade tank 120, and the cascade tank 120 and the feed water pump 140 are connected. Since the pipes are attached to the cascade tank 120, the installation space can be greatly reduced as compared to the conventional case where each device is installed separately. That is, since the installation location of each of the above devices is a limited space in the ship and further in the engine room, the space saving rate by the cascade tank unit 100 is very large, and the effect such as expansion of the loading space is great. There is something. Furthermore, the space required for the piping between the condenser 110 and the cascade tank 120 and the space required for the piping between the cascade tank 120 and the feed water pump 140 can be reduced, further reducing the space in the engine room. Can contribute. Further, according to the cascade tank unit 100, it is possible to rationalize the outfitting as compared to the conventional case in which each device is installed and piping work is required. Therefore, on the shipyard side, the manufacturing cost can be reduced, the delivery time can be shortened, and the effect is enormous.
[0023]
In the above-described embodiment, the pump discharge side pipes 145-1 and 145-2 are provided on the discharge sides of the first water supply pump 140-1 and the second water supply pump 140-2. Thus, the pump discharge side pipe 146 in which the pump discharge side pipes 145-1 and 145-2 are combined into one can be provided, and the pump discharge side pipe 146 and the condensed water supply pipe connected to the boiler 240 are provided. 230 may be connected. The bypass pipe 150 is connected to the pump discharge side pipe 146.
[0024]
Further, as shown in FIGS. 5 and 6, the bypass pipe 150 may be omitted from the pump discharge side pipes 145-1 and 145-2 and the pump discharge side pipe 146. In this case, in order to prevent the overheating described above, when the closed state of the feed water inlet of the boiler 240 is detected, control for automatically stopping the motors 141 and 141 of the first feed water pump 140-1 and the second feed water pump 140-2 is performed. A circuit is provided.
[0025]
In addition, although the cascade tank unit 100 of the present embodiment has a configuration including the pump discharge side pipes 145-1 and 145-2, the pump discharge side pipes 145-1 and 145-2 may not be included. That is, each discharge port 144-1 and 144-2 of the 1st feed water pump 140-1 and the 2nd feed water pump 140-2 is good also as a joint point with the condensed water supply piping 230. FIG.
[0026]
Next, a boiler water supply system including the cascade tank unit 100 having the above-described configuration will be described.
As shown in FIG. 1, the boiler water supply system 200 includes the cascade tank unit 100, a steam pipe 210, and a condensed water supply pipe 230. The steam pipe 210 is a pipe that is generated in the boiler 240 and guides the used steam to the steam inlet 111 of the condenser 110 provided in the cascade tank unit 100. The steam pipe 210 is installed in the ship and connected to the steam inlet 111. The The condensed water supply pipe 230 is a pipe connected to the pump discharge side pipe 145 on the discharge side of the feed water pump 140 provided in the cascade tank unit 100. From the cascade tank 120 to the boiler 240, the pump discharge side pipe 145 is connected. The discharged condensed water 117 is guided.
[0027]
In the boiler water supply system 200 configured as described above, the steam generated in the boiler 240, for example, after heating the fuel before being injected into the fuel tank and the main engine and the diesel generator is shown in FIG. As shown by “I” in FIG. 5, the steam is supplied to the condenser 110 of the cascade tank unit 100 through the steam pipe 210. Further, the drain generated in the ship can also be supplied to the condenser 110 through the drain pipe 220. The steam supplied to the condenser 110 through the steam pipe 210 and the drain pipe 220 is condensed by the condenser 110. The obtained condensed water is poured into the cascade tank unit 100 together with the drain as shown by “II” in FIG. In the cascade tank unit 100, the condensed water 117 is removed from the impurities as indicated by “III” and “IV” in FIG. As shown, the water is again supplied to the boiler 240 through the pump discharge side pipe 145 and the condensed water supply pipe 230.
[0028]
Thus, according to the boiler water supply system of this embodiment, since the cascade tank unit 100 described above is provided, the above-described space saving and rationalization of the outfitting can be achieved.
[0029]
【The invention's effect】
As described in detail above, according to the cascade tank unit of the first aspect of the present invention and the boiler water supply system of the second aspect, the cascade tank, the condenser, And the installation space of an apparatus can be reduced significantly compared with the past which installed the water pump separately. Further, along with the downsizing, the piping between the condenser and the cascade tank and the piping between the cascade tank and the water supply pump can be reduced, and further, the installation space can be reduced. In addition, with these downsizing, the equipment can be rationalized.
[Brief description of the drawings]
FIG. 1 is a piping diagram showing a cascade tank unit and a boiler water supply system according to an embodiment of the present invention.
FIG. 2 is a front view of the cascade tank unit shown in FIG.
FIG. 3 is a right side view of the cascade tank unit shown in FIG.
FIG. 4 is a piping diagram showing a modification of the pump discharge side piping provided in the cascade tank unit shown in FIG. 1;
FIG. 5 is a piping diagram showing a modification of pump discharge side piping provided in the cascade tank unit shown in FIG. 1;
6 is a piping diagram showing a modification of the pump discharge side piping provided in the cascade tank unit shown in FIG. 1; FIG.
FIG. 7 is a piping diagram showing a conventional boiler water supply system.
[Explanation of symbols]
100 ... Cascade tank unit, 110 ... Condenser,
114 ... Condensate outlet, 116 ... Condensate mounting position,
120 ... Cascade tank, 121 ... Cascade tank upper part,
122 ... Pump mounting surface, 140 ... Water supply pump,
140-1 ... 1st water supply pump, 140-2 ... 2nd water supply pump,
142 ... impeller drive shaft, 144-1, 144-2 ... discharge port,
150 ... Bypass piping,
200 ... Boiler water supply system, 210 ... Steam piping,
230: Condensate supply pipe.

Claims (5)

A condenser (110) for condensing steam used in the ship;
A cascade tank (120) for attaching the condenser and removing impurities from the condensed water supplied from the condenser;
Attached to pump mounting surface along the vertical direction definitive in the cascade tank (122), a water supply pump for supplying water to the condensed water from the cascade tank to the boiler for generating the steam (140), the driving of the pump An impeller drive shaft (142) connecting the source (141) and the impeller in the pump is disposed along the vertical direction, and the drive source is disposed above the impeller in the pump in the vertical direction, and The drive source is a feed water pump not supported by the pump mounting surface ,
With
The condenser is located at a condenser attachment position (116) located diagonally across the cascade tank with respect to the water supply pump attached to the pump attachment surface located at the upper part (121) of the cascade tank. It is attached,
Cascade tank unit characterized by that. There are two water supply pumps on the pump mounting surface, the discharge ports (144-1, 144-2) of the pumps (140-1, 140-2) are opposed to each other, and the side surface of the cascade tank. The cascade tank unit according to claim 1, wherein the cascade tank unit is mounted adjacent to each other on the pump mounting surface.   The cascade tank unit according to claim 2, wherein the condensate outlet (114) of the condenser is oriented vertically and the condensed water is injected into the cascade tank by gravity. The condensate is circulated between the feedwater pump and the cascade tank to prevent overheating of the feedwater pump when attached to the discharge side of the feedwater pump and when the feedwater of the condensed water to the boiler is shut off The cascade tank unit according to any one of claims 1 to 3, further comprising a bypass pipe (150) for returning the condensed water discharged from the feed water pump to the cascade tank. Cascade tank unit (100) according to any of claims 1 to 4,
  A steam pipe (210) that guides steam generated in the boiler and used to the condenser (110) provided in the cascade tank unit;
  A condensed water supply pipe (230) connected to the discharge side of the feed water pump (140) provided in the cascade tank unit, and leading condensed water from the cascade tank (120) provided in the cascade tank unit to the boiler;
A boiler water supply system characterized by comprising:

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