JP2008018372A - Water generator using scavenging air cooler in diesel engine, and clear water spray injection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a water generator for obtaining a large amount of clear water by effectively using waste heat of a diesel engine; to obtain a clear water spray injection device used in a diesel engine for reducing the amount of NOx contained in an exhaust gas. <P>SOLUTION: The water generator uses waste heat of a scavenging air cooler in a diesel engine. The scavenging air cooler is installed so as to connect with a scavenging air chamber, and the water generator which receives seawater, and evaporates and distills the seawater under a reduced pressure is installed. A heat exchanger pipe is installed between the scavenging air cooler and the water generator to generate water by using the waste heat of the scavenging air cooler. In the device for spray injection of clear water to a diesel engine, clear water generated by the above means using the waste heat of the scavenging air is sprayed from the water generator into the scavenging air chamber through a discharge pipe, or directly injected into a cylinder from the water generator through the discharge pipe. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fresh water generator and a fresh water spray / injection device using waste heat of a main engine in a diesel ship, and in particular, uses waste heat of an air cooler of scavenging air supplied to the main engine. The present invention relates to a fresh water generator and a spray and spray device for fresh water obtained by the fresh water generator.

In general, in a diesel ship, wastewater is generated using the waste heat of a diesel engine, and the waste heat is effectively recovered.
For example, in a cooling water system of a diesel engine cylinder having a cooler, a fresh water generator that obtains distilled water by heat exchange with seawater is directly connected to a circulating fresh water pump for cooling a diesel engine to perform fresh water generation ( For example, see Patent Document 1).

However, with the recent increase in efficiency of diesel engines, the amount of fresh water produced (fresh water) tends to decrease due to a reduction in the amount of waste heat of diesel engines.
On the other hand, NOx contained in exhaust gas from diesel engines has recently been regulated in ships in each sea area, and various measures are being studied. Measures to reduce the occurrence of water are being studied, and a large amount of fresh water is required for that purpose.

JP-A-60-51589 (first page, second page, FIG. 1)

  The present invention provides a fresh water generator that effectively uses waste heat from a diesel engine to obtain a large amount of fresh water, and a fresh water spray and injection device that is used in a diesel engine to reduce the amount of NOx contained in exhaust gas. For the purpose.

  A desalination apparatus that uses waste heat of a scavenging air cooler in a diesel engine, and is provided with a scavenging air cooler connected to the scavenging air chamber, and also introduces seawater to evaporate and distill under reduced pressure. A heat exchange pipe is provided between the scavenging air cooler and the fresh water generator, and water is made using the waste heat of the scavenging air cooler.

  The heat exchange pipe is configured as a closed pipe line provided with a pump in the middle, the heat exchange medium is sealed and circulated, and the heat exchange pipe is provided with a pump at one end for directly sucking seawater, A nozzle is provided at the front end of the multi-end side and disposed in the fresh water generator, and the seawater is flushed into the evaporation chamber of the fresh water generator, and the heat exchange pipe is disposed in a stage before being disposed in the scavenging air cooler. Also, it is characterized by being passed through the evaporation chamber of the fresh water generator.

  Also, it is a fresh water spraying and injection device for diesel engines, provided with a scavenging air cooler connected to the scavenging air chamber, and provided with a fresh water generator that introduces seawater and evaporates and distills under reduced pressure. A fresh water produced using the waste heat of the scavenging air cooler is sprayed into the scavenging air chamber through the discharge pipe from the fresh water generator, Or it was made to inject in a cylinder through a discharge pipe from a fresh water generator.

The diesel engine is supplied with high-temperature scavenging air that is adiabatically compressed by a supercharger. The scavenging air waste heat from the air cooler is taken into a fresh water generator to produce fresh water. In addition, the fresh water produced is sprayed and injected into the diesel engine to reduce the combustion temperature of the diesel engine and reduce NOx contained in the exhaust gas from the diesel engine. Fresh water can be produced stably by the amount of heat obtained in proportion to the output, and fresh water is obtained.
Further, the clean water obtained stably is sprayed on scavenging air supplied to the diesel engine or injected into the cylinder of the diesel engine to suppress the combustion temperature of the diesel engine, so that NOx contained in the exhaust gas is reduced. Can be reduced.

  The best mode of the present invention shown in the drawings will be described below. FIG. 1 is a schematic view showing an example of a fresh water generator according to the present invention, and FIG. 2 is a schematic view showing another example of the fresh water generator. FIG. 3 is a modification of the fresh water generator shown in FIG. FIG. 4 is a schematic view showing an example in which fresh water obtained by the fresh water generator is sprayed into the scavenging air chamber, and FIG. 5 is a schematic view showing an example in which fresh water is directly injected into the cylinder.

  In the figure, 1 is a diesel engine. 2 is a cylinder of the diesel engine 1, 3 is a crank connected to the cylinder 2, and 4 is an output shaft rotated by the crank 3. Reference numeral 5 denotes an exhaust pool connected to the exhaust port of the cylinder 2, and 6 denotes a supercharger. Using the energy of the exhaust gas from the exhaust pool 5, air is adiabatically compressed by the supercharger 6 and sent to the scavenging air chamber 7 as scavenging air. A scavenging air cooler 8 is connected to the scavenging air chamber 7.

  The scavenging air is adiabatically compressed and has a high temperature, and is supplied to the diesel engine 1 after being cooled by the scavenging air cooler 8 in order to increase the air density. Normally, although not shown in the scavenging air cooler 8, the scavenging air is heat-exchanged with seawater or fresh water to lower the temperature, but heretofore a large amount of waste heat has been discarded.

In FIG. 1, the scavenging air cooler 8 is provided with a heat exchange pipe 9 between a decompression pot type fresh water generator 11. The heat exchange pipe 9 has a closed line configuration in which a pump 10 is provided in the middle, and the heat exchange medium is sealed and circulated.
In the fresh water generator 11, a heating pipe 9 'of a heat exchange pipe 9 is disposed in a water tank chamber 11', and a heat exchange medium of about 80 ° C or higher is circulated and supplied on the inlet side of the water tank chamber 11 '. ing. Seawater is introduced into the aquarium chamber 11 ', but since the fresh water generator 11 is under reduced pressure, the introduced seawater is suddenly decompressed and evaporated into the evaporation chamber 11 ", cooled in the evaporation chamber 11" and distilled. Water is obtained. In addition, the obtained distilled water is sent for the intended purpose through the discharge pipe 12. Reference numeral 13 denotes a seawater supply pipe for the water tank chamber 11 '.

In the example shown in FIG. 2, the heat exchange pipe 14 provided in the scavenging air cooler 8 is provided with a pump 15 so that seawater is directly sucked at one end, and the multi-end side is arranged in the fresh water generator 16. A nozzle is provided at the tip thereof, and the seawater is flushed into the evaporation chamber 16 ″ of the fresh water generator 16.
Therefore, the seawater sucked by the pump 15 is heated in the heat exchange pipe 14, reaches about 80 ° C. or more on the outlet side, is flushed into the evaporation chamber 16 ″ under reduced pressure, is rapidly decompressed, and is vaporized in the steam chamber 16 ″. It evaporates inside and is cooled in the steam chamber 16 ″ to obtain distilled water.

The example shown in FIG. 3 is a modification of the configuration of FIG. 2, and the heat exchange pipe 14 ′ provided in the scavenging air cooler 8 sucks seawater directly at one end as in the configuration of FIG. 2. The pump 15 is provided at the multi-end side, and the multi-end side is provided in the fresh water generator 16, but is passed through the evaporation chamber 16 ″ of the fresh water generator 16 in the previous stage provided in the scavenging air cooler 8. ing.
According to this configuration, the seawater sucked by the pump 15 is preheated in the evaporation chamber 16 ″ and then sent to the scavenging air cooler 8, so that it is heated efficiently. Further, the steam cooling in the evaporation chamber 16 ″ is performed. Since it is used also as water, it becomes an effective structure as an apparatus.

  Next, a fresh water spraying device for the diesel engine 1 will be described. FIG. 4 shows an example in which fresh water obtained by the fresh water generator 16 is sprayed into the scavenging air chamber 7. The fresh water obtained by the fresh water generator 16 is sprayed into the scavenging air chamber 7 through the discharge pipe 12 ′, mixed into the scavenging air, and introduced into the cylinder 2. FIG. 5 shows an example in which fresh water obtained by the fresh water generator 16 is directly injected into the cylinder 2. The fresh water obtained by the fresh water generator 16 is introduced into the cylinder 2 from the fresh water injection valve 17 provided at the top of the cylinder 2 through the discharge pipe 12 ″ and mixed into the fuel injected from the fuel injection valve 18.

  Now, the combustion temperature of this kind of diesel engine 1 reaches 1000 degreeC or more. It is known that NOx is generated when fuel heavy oil is combusted, and this NOx is generated at a high temperature when a larger amount of NOx is generated.

  In the present invention, as described above, fresh water is mixed into the scavenging air or the injected fuel, so that the combustion temperature in the cylinder 2, particularly the peak temperature, can be reduced, and the NOx content in the combustion exhaust gas is correspondingly reduced. Can be lowered. Since it differs from engine to engine, it cannot be generally stated, but in one example, the NOx content in the exhaust gas is halved. Moreover, since it was made to produce using the waste heat of the scavenging air cooler 8 proportional to the output (kw) of the diesel engine 1, approximately 2 liters / kw / day is proportional to the output of the diesel engine 1. The above-mentioned fresh water can be stably obtained, and the amount of fresh water necessary for NOx reduction can be ensured.

Schematic which shows one example of the fresh water generator by this invention. Schematic which similarly shows the other example of a fresh water generator. The modification of the fresh water generator shown in FIG. Schematic which shows the example which sprays the fresh water obtained with the fresh water generator into the scavenging air chamber. Schematic which similarly shows the example which injects fresh water directly into a cylinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Diesel engine 2 Cylinder 3 Crank 4 Output shaft 5 Exhaust pool 6 Supercharger 7 Scavenging air chamber 8 Scavenging air cooler 9 Heat exchange pipe 10 Pump 11 Fresh water generator 12 Discharge pipe 13 Seawater supply pipe 14 Heat exchange pipe 15 Pump 16 Fresh water generator 17 Fresh water spray valve 18 Fuel injection valve

Claims (6)

  A scavenging air cooler connected to the scavenging air chamber, a fresh water generator that evaporates and distills under reduced pressure is introduced, and a heat exchange pipe is provided between the scavenging air cooler and the fresh water generator. A fresh water generator using a scavenging air cooler in a diesel engine, characterized in that fresh water is generated using waste heat of the scavenging air cooler.   2. The heat exchange pipe provided between the scavenging air cooler and the fresh water generator has a closed line configuration in which a pump is provided in the middle, and the heat exchange medium is sealed and circulated. A fresh water generator using a scavenging air cooler in a diesel engine.   The heat exchange pipe provided between the scavenging air cooler and the fresh water generator is provided with a pump so that seawater is directly sucked at one end, and a nozzle is provided at the front end of the multi-end side and disposed in the fresh water generator, 2. The fresh water generator using a scavenging air cooler in a diesel engine according to claim 1, wherein seawater is flushed into an evaporation chamber of the fresh water generator.   4. The diesel engine according to claim 3, wherein the heat exchange pipe provided between the scavenging air cooler and the fresh water generator is passed through the evaporation chamber of the fresh water generator before being disposed in the scavenging air cooler. Fresh water generator using scavenging air cooler.   A scavenging air cooler connected to the scavenging air chamber of the diesel engine and a fresh water generator that evaporates and distills under reduced pressure by introducing seawater, and a heat exchange pipe between the scavenging air cooler and the fresh water generator The spray of fresh water is characterized in that fresh water produced using waste heat of the scavenging air cooler is sprayed into the scavenging air chamber through the discharge pipe from the fresh water generator and mixed into the scavenging air. apparatus.   A scavenging air cooler connected to the scavenging air chamber of the diesel engine and a fresh water generator that evaporates and distills under reduced pressure by introducing seawater, and a heat exchange pipe between the scavenging air cooler and the fresh water generator A fresh water injection device characterized in that fresh water produced using waste heat of the scavenging air cooler is injected into the cylinder through the discharge pipe from the fresh water generation device and mixed into the injected fuel .

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