Arrangement for recovering the waste heat produced by a ship engine

Abstract

 Arrangement for recovering the waste heat produced by a ship (1) engine in which arrangement the waste heat of the engine (2) is directed to a container located on the ship and including liquid when the ship is sailing and at a harbour the liquid is pumped from the mentioned container to a container or a pipework located on shore. The waste heat is directed to crude oil being the cargo of the ship and at the harbour the crude oil which is pre-heated for a refining process is pumped to the storage of an oil refinery or directly to the process pipework of the refinery.

Description

[0001] The invention relates to an arrangement for recovering the waste heat produced by a ship engine when the ship is at sea. Especially the invention relates to a large-scale utilization of the waste heat occurring later outside the ship and relates to the storage of the waste heat on the ship when the ship is moving.

[0002] The heating of a ballast tank with the cooling water of an engine is previously known from the publication JP 8091288 for that reason that the harmful plankton in the tank will die. Further the heating of the water of the ballast tank with the waste heat of the engine is known from the publication JP 55025608 for that reason that its freezing is prevented.

[0003] The known utilizations of the waste heat do not however utilize the waste heat of the engine in the large scale and no utilization occurs outside the ship. With the arrangement according to the invention a large-scale utilization of the waste heat can be achieved and the utilization can be done outside the ship. It is characteristic of the invention that the waste heat is directed to crude oil being the cargo of the ship and at the harbour the crude oil which is pre-heated for the refining process is pumped to the storage of the oil refinery or directly to the process pipework of the refinery.

[0004] The advantage of the recovery of the waste heat according to the invention is that bulk boats have already large liquid quantities ready in the tanks which can be heated, such as the crude oil can be heated in the appropriate tanks. The crude oil can form the whole cargo of the bulk boat which crude oil can be heated during the journey in such a way that it is pre-heated by several dozens of degrees when it is pumped to the refinery. As pre-heated it eases the oil refining process. The waste heat can be gained from the cooling water of the engine and from exhaust gases. A number of heat exchangers, pumps and of course pipework arrangements are needed on the ship. A receiving tank or a pipework of the warm crude oil is needed at the harbour in order to lead the crude oil directly to the process.

[0005] In the following the invention is described more detailed by referring to the accompanying drawing in which

Figure 1 shows a motor ship and the recovery of the waste heat of the engine adjusted to it.

[0006] A ship 1 sailing on the sea is shown in the figure 1 which ship comprises an engine 2 and cargo tanks 8 which include crude oil. When the engine 2 is running, its cooling water is circulated with the help of a pump 4 through the heat exchanger 6 of the cargo tank 8 in which case the temperature of the crude oil of the cargo tank can be made to rise close to 40°C or slightly above it. Further the heat of the exhaust gases is recovered and with the help of the pump 5 for example the cooling liquid of the engine 2 is circulated between the exhaust gas heat exchanger 3 and the heat exchanger 7 of the cargo tank. When the cooling water of the engine 2 is being circulated, the heat exchanger 7 can be left out if the circulation of the pump 5 is directed also to the heat exchanger 6.

[0007] The crude oil can be heated by several dozens of degrees, but not however much above 40°C because the developing of burning gases to the cargo room must be avoided. The preheating of the crude oil cargo improves considerably the starting of the refining process of this crude oil quantity during the oil refining.

[0008] The receiving of the stored heat energy, such as the pre-heated crude oil being on the ship occurs at the harbour which can have various arrangements, such as a receiving tank 9 to which the pre-heated crude oil is moved by pumping. Further one alternative can be that the pre-heated crude oil cargo of the bulk boat is unloaded at the harbour of the oil refinery in a normal way by pumping it to the process pipework in which case there is a connection unit 11 at the harbour for connecting it to a pipeline.

Claims

1. Arrangement for recovering the waste heat produced by a ship (1) engine in which arrangement the waste heat of the engine (2) is directed to a container located on the ship and including liquid when the ship is sailing and at a harbour the liquid is pumped from the mentioned container to a container or a pipework located on shore, characterized in that the waste heat is directed to crude oil being the cargo of the ship and at the harbour the crude oil which is pre-heated for a refining process is pumped to the storage of an oil refinery or directly to the process pipework of the refinery.

2. Arrangement according to the claim 1, characterized in that the waste heat is recovered from the cooling system of the engine with the help of a circulation pump (4) and a heat exchanger (6) and from exhaust gases with the help of heat exchangers (3), (7) and the circulation pump (5).

Drawing