JP2013160132A - Exhaust-heat recovery and utilization system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust-heat recovery and utilization system for further effectively utilizing exhaust heat of a diesel engine.SOLUTION: An exhaust-heat recovery and utilization system includes: a jacket cooling water circulation system 20 which circulates jacket cooling water 9 for cooling a jacket of a diesel engine 1; a power generation means 2 which recovers heat from the jacket cooling water 9, in which the temperature is elevated by cooling the jacket, and utilizes the heat to generate power; and a water production means 3 which recovers the heat of the jacket cooling water 9, in which the temperature is elevated by cooling the jacket, and utilizes the heat to produce purified water.

Description

  The present invention relates to, for example, an exhaust heat recovery and utilization system that recovers exhaust heat of a diesel engine of a main engine of a ship and generates electric power using the exhaust heat.

  Conventionally, about 50% of thermal energy generated in a diesel engine (internal combustion engine) as a main engine for propulsion in a ship is effectively consumed as net horsepower such as thrust, propeller loss, and bearing loss, and the remaining 50%. However, it is lost and not used as exhaust, piston cooling oil loss, jacket cooling water loss, air cooler cooling loss, etc.

  On the other hand, the applicant of the present application has already filed an application relating to an exhaust heat recovery power generation system that recovers exhaust heat of a diesel engine of a ship and generates electric power (Japanese Patent Application No. 2011-081094). This exhaust heat recovery power generation system recovers heat from air cooling water (heat medium) of an air cooler that cools compressed air discharged from a turbocharger of a diesel engine or exhaust gas sent from a turbocharger to a chimney. A recovery unit (evaporator), a power turbine that converts the energy of the working medium evaporated by the heat recovered by the exhaust heat recovery unit into rotational power, and a generator that generates electric power by the rotational power of the power turbine (For example, refer to Patent Document 1).

  By providing this exhaust heat recovery power generation system, heat can be recovered from the heat medium of the high-temperature air cooler and the exhaust gas sent to the chimney, and the working medium evaporated by this heat can drive the power turbine to generate power. It is possible to effectively use the exhaust heat of the diesel engine to cover the power in the ship.

  In a ship, jacket cooling water is circulated in a jacket cooling water circulation system, and the jacket of the diesel engine is cooled by heat exchange between the jacket cooling water and the jacket of the diesel engine. Conventionally, the jacket cooling water heated to a high temperature by cooling the jacket is recovered and used by the fresh water generation means (fresh water generator) to produce fresh water from the sea water, etc. (For example, refer to Patent Document 1).

Japanese Patent No. 3923820

  However, even if the exhaust heat of the diesel engine is recovered and used by fresh water generation means as described above, there is much heat energy that is lost without being effectively used, and it is strongly recommended to further utilize the exhaust heat of the diesel engine. It was desired.

  In view of the above circumstances, an object of the present invention is to provide an exhaust heat recovery and utilization system for enabling further effective utilization of exhaust heat of a diesel engine.

  In order to achieve the above object, the present invention provides the following means.

  The exhaust heat recovery utilization system of the present invention recovers heat from a jacket cooling water circulation system that circulates jacket cooling water for cooling a jacket of a diesel engine, and jacket cooling water that has been heated to a high temperature by cooling the jacket. It comprises a power generation means for generating electricity using heat, and a fresh water generation means for recovering heat of the jacket cooling water that has been heated to a high temperature by cooling the jacket, and for producing purified water using the heat. And

  In the present invention, heat is recovered from jacket cooling water (jacket cooling water after cooling the jacket) that is heated by cooling the jacket, and this heat can be used to generate power by means of power generation. Using the heat of the jacket cooling water, it becomes possible to produce purified water by fresh water generation means. As a result, the heat of jacket cooling water that has not been effectively used can be recovered to generate power and produce fresh water, and the exhaust heat of the diesel engine can be used more effectively.

  Further, in the exhaust heat recovery and utilization system of the present invention, the fresh water generating means evaporates the water to be treated using the energy of heat recovered from the jacket cooling water that has been cooled and heated to increase the purified water It is desirable to produce fresh water.

  In the present invention, the heat of the jacket cooling water that has been heated to a high temperature by cooling the jacket is recovered by the fresh water generating means, and the water to be treated such as seawater is evaporated by effectively using the recovered heat to obtain drinking water or the like. It becomes possible to produce purified water that can be used.

  Further, in the exhaust heat recovery and utilization system of the present invention, a temperature measuring means for measuring the temperature of the jacket cooling water, and the power generating means and the structure based on the temperature of the jacket cooling water measured by the temperature measuring means. It is more preferable to include control means for adjusting the amount of heat of the jacket cooling water collected by the water means.

  Here, if too much heat is recovered from the jacket cooling water after cooling the diesel engine jacket, the temperature difference between the jacket cooling water supplied to the diesel engine jacket and the temperature after cooling the jacket becomes too large. There is a risk of damaging the diesel engine.

  In contrast, in the present invention, the amount of heat of the jacket cooling water recovered by the power generation means and the fresh water generation means can be adjusted by the control means, so that the jacket cooling water can be prevented while preventing damage to the diesel engine. Heat can be recovered and used effectively.

  In the exhaust heat recovery and utilization system of the present invention, the fresh water generating means may make purified water using the electric power generated by the power generating means.

  In this invention, by using the electric power generated by the power generation means and covering all or part of the power consumption of the fresh water generation means, the exhaust heat of the diesel engine is used to efficiently produce fresh water. Is possible. In addition, it is possible to eliminate or reduce the electric power energy that has been separately supplied to drive the fresh water generation means, and it is possible to realize further energy saving.

  In the exhaust heat recovery and utilization system of the present invention, heat can be recovered and utilized from the jacket cooling water that has been heated by cooling the jacket, and can be generated by the power generation means, and purified water can be generated by the fresh water generation means. Is possible. As a result, the heat of jacket cooling water that has not been effectively used can be recovered to generate power and produce fresh water, and the exhaust heat of the diesel engine can be used more effectively.

It is a figure which shows the exhaust-heat recovery utilization system which concerns on one Embodiment of this invention. It is a figure which shows the waste heat recovery utilization system which concerns on one Embodiment of this invention, and is a figure which shows the part which collect | recovers heat from jacket cooling water. It is a figure which shows the example of a change of the waste heat recovery utilization system which concerns on one Embodiment of this invention. It is a figure which shows the example of a change of the waste heat recovery utilization system which concerns on one Embodiment of this invention.

  Hereinafter, with reference to FIG.1 and FIG.2, the exhaust-heat-recovery utilization system which concerns on one Embodiment of this invention is demonstrated.

  As shown in FIGS. 1 and 2, the exhaust heat recovery and utilization system A of the present embodiment recovers exhaust heat of a diesel engine (internal combustion engine) 1 as a main propulsion unit for a ship, and uses this heat to generate power. Power generation means 2 for generating water, and fresh water generation means 3 for producing purified water using heat.

  First, the power generation means 2 of the present embodiment is a power generation system configured with an organic Rankin Cycle (ORC). The power generation system 2 includes an air cooling water (heat medium) 6 of the air cooler 5 that cools the compressed air discharged from the supercharger 4 of the diesel engine 1, and an exhaust gas 7 that is sent from the supercharger 4 to the chimney 17. A first exhaust heat recovery device (evaporator) 8 that recovers heat from the exhaust gas, and a second exhaust heat recovery device (evaporator) that recovers heat from the jacket cooling water 9 that flows in the jacket that cools the cylinder block and the like of the diesel engine 1. ) 10, a power turbine (radial turbine) 12 that converts the energy of the organic medium (working medium) 11 evaporated by exchanging heat in the first exhaust heat recovery device 8 and the second exhaust heat recovery device 10 into rotational power, And a generator 13 that generates electric power by the rotational power of the power turbine 12.

  Further, in the exhaust heat recovery utilization system A (power generation means 2) of the present embodiment, an organic medium in which the organic medium 11 is circulated among the first exhaust heat recovery device 8, the second exhaust heat recovery device 10, and the power turbine 12. A circulation path (organic medium circulation system) 14 is provided. The organic medium circulation path 14 includes a circulation pump 15 for circulating the organic medium 11 and a condenser 16 for condensing the organic medium 11 sent from the power turbine 12. And is configured. Further, the organic medium circulation path 14 is configured to recover the heat from the jacket cooling water 9 by sending the organic medium 11 evaporated by the first exhaust heat recovery unit 8 to the high pressure side (high pressure side turbine wheel) of the power turbine 12. 2 The organic medium 11 evaporated by the exhaust heat recovery device 10 is sent to the low pressure side (low pressure side turbine wheel), and the energy is converted into the rotational power of the power turbine 12.

  In other words, the organic medium circulation path 14 is arranged so that the path passing through the first exhaust heat recovery unit 8 and the path passing through the second exhaust heat recovery unit 10 are in parallel between the circulation pump 15 and the power turbine 12. The path passing through the first exhaust heat recovery unit 8 is branched from the path passing through the second exhaust heat recovery unit 10, and is formed so as to merge at the power turbine 12.

  Further, as the organic medium 11 flowing through the organic medium circulation path 14, low molecular hydrocarbons such as isopentane, butane, and propane, R134a, R245fa, and the like can be used. The organic medium 11 is selected in accordance with the temperature distribution of a plurality of heat media to be recovered.

  Further, the exhaust heat recovery and utilization system A (power generation means 2, fresh water generation means 3) of the present embodiment has a jacket cooling water circulation path (jacket cooling water circulation system) 20 for circulating the jacket cooling water 9 to the jacket of the diesel engine 1. Is provided. The jacket cooling water circulation path 20 includes a circulation pump 21 for circulating the jacket cooling water 9 and a jacket cooler 22 for cooling the jacket cooling water 9 to about 36 ° C., for example.

  Further, the jacket cooling water circulation path 20 recovers heat from the jacket cooling water 9 and uses the heat to evaporate the organic medium 11. Are connected.

  Further, the jacket cooling water circulation path 20 of the present embodiment is provided with a first three-way valve 23 upstream of the jacket cooler 22 in the flow direction T of the jacket cooling water 9. A path for circulating the jacket cooling water 9 through the cooler 22 and a branch connection from the first three-way valve 23 to the downstream side in the flow direction T of the jacket cooler 22 to allow the jacket cooling water 9 to flow to the jacket cooler 22. And a bypass path 24 that is circulated without being circulated. Further, a first temperature measuring means 25 for measuring the temperature of the jacket cooling water 9 in the vicinity of the inlet of the jacket is provided on the upstream side in the flow direction T with respect to the diesel engine 1, and a control means 26 is provided with the first temperature measuring means. The opening / closing drive of the first three-way valve 23 is controlled based on the measurement result by 25.

  Further, between the diesel engine 1 and the first three-way valve 23, the power generation that supplies the jacket cooling water 9 that has been heated to, for example, 80 to 90 ° C. after cooling the jacket to the second exhaust heat recovery unit 10 of the power generation means 2. The supply flow path 27 and a power generation return flow path 28 for returning the jacket cooling water 9 recovered by the second exhaust heat recovery device 10 to the jacket cooling water circulation path 20 are branched and connected. At this time, the power generation / feed passage 27 is connected to the diesel engine 1 side (the upstream in the flow direction T) with respect to the power return passage 28. Further, the power generation / feed passage 27 is provided with an opening / closing valve 29, and the power generation return passage 28 is provided with a first flow meter 30 and the temperature of the jacket cooling water 9 flowing through the power generation return passage 28. 2 temperature measuring means 31 is provided, and the control means 26 is configured to control the opening / closing drive of the opening / closing valve 29 based on the measurement result by the second temperature measuring means 31.

  In addition, the fresh water generating means 3 of the present embodiment recovers the heat of the jacket cooling water 9 that has been heated after cooling the jacket, evaporates the water to be treated such as seawater using the energy of the recovered heat, It is for producing purified water used as drinking water. In this embodiment, the jacket cooling water supply passage 32 that supplies the jacket cooling water 9 from the jacket cooling water circulation path 20 to the fresh water generating means 3 and the jacket cooling water 9 that has been heat-recovered by the fresh water generating means 3 are jacket cooled. A fresh water return flow path 33 for returning to the water circulation path 20 is disposed between the power generation supply flow path 27 and the power generation return flow path 28 connected to the second exhaust heat recovery device 10. At this time, the fresh water supply flow path 32 of the fresh water generating means 3 is provided on the diesel engine 1 side (upstream side in the flow direction T) with respect to the fresh water return flow path 33. Furthermore, the fresh water return flow path 33 is connected to the jacket cooling water circulation path 20 via the second three-way valve 34. Further, a second flow meter 35 for measuring the flow rate of purified water generated by the fresh water generating means 3 is provided, and the control means 26 controls the opening / closing drive of the second three-way valve 34 based on the measurement result of the flow meter 35. Is configured to do.

  In the exhaust heat recovery and utilization system A of the present embodiment, the control unit 26 controls the opening / closing drive of the first three-way valve 23 based on the measurement result by the first temperature measurement unit 25, and the measurement by the second temperature measurement unit 31. By controlling the opening / closing drive of the opening / closing valve 29 based on the result and controlling the opening / closing drive of the second three-way valve 34 based on the measurement result of the flow meter 35, jacket cooling recovered by the power generation means 2 and the fresh water generation means 3 respectively. The amount of heat of the water 9 is adjusted.

  On the other hand, as shown in FIG. 1, the compressed air 40 compressed by the supercharger 4 is, for example, 150 to 160 ° C., supplied to the diesel engine 1 through the air cooler 5, and supplied from a fuel supply system (not shown). It is mixed with fresh fuel and burned. For example, after the exhaust gas 7 at about 220 ° C. is used for the operation of the supercharger 4, the exhaust gas 7 is discharged from the chimney 17 through the exhaust gas path 41.

  At this time, a first exhaust gas economizer 42 and a second exhaust gas economizer 43 are provided in the exhaust gas path 41. The exhaust gas path 41 is configured so that the exhaust gas 7 passes through the first exhaust gas economizer 42 and the second exhaust gas economizer 43, or passes through either one of them, or does not pass through both. It is configured to be selectable.

  A circulation path is formed between the first exhaust gas economizer 42 and the steam drum 47. Water in the steam drum 47 is sent to the first exhaust gas economizer 42 by the boiler drum water circulation pump 44, and steam is generated by heat recovery of the exhaust gas 7. The generated steam is sent to an auxiliary device of the ship, and then returned to the atmospheric pressure drain tank 45 as, for example, about 70 ° C. water. Further, the water in the atmospheric pressure drain tank 45 is sent to the air cooler 5 through the water supply path by the water supply pump 46, further recovered from the exhaust gas 7 by the second exhaust gas economizer 43, and sent to the first exhaust heat recovery unit 8. And is circulated back to the atmospheric pressure drain tank 45.

  In the exhaust heat recovery and utilization system A of the present embodiment configured as described above, first, the compressed air 40 discharged from the supercharger 4 of the diesel engine 1 is cooled, and the air cooling of the air cooler 5 that has been increased in temperature is performed. The water is sent to the second exhaust gas economizer 43 and exchanges heat with the exhaust gas 7 from the diesel engine 1 to evaporate. The vapor of the air cooling water 6 is sent to the first exhaust heat recovery device 8 to evaporate the organic medium 11. The vapor of the organic medium 11 is sent to the high pressure side of the power turbine 12, and the power turbine 12 is rotated by the energy and electric power is generated by the generator 13.

  On the other hand, in the exhaust heat recovery and utilization system A of the present embodiment, as shown in FIG. 2 (and FIG. 1), jacket cooling water 9 that has been lowered in temperature by the jacket cooler 22 is supplied to the jacket of the diesel engine 1. Cool down and heat up. Then, the jacket cooling water 9 having a high temperature after cooling the jacket is sent from the fresh water supply flow path 32 to the fresh water generating means 3, and the water to be treated such as seawater is evaporated by the heat of the jacket cooling water 9. Purified water is produced.

  At this time, the measurement result of the flow rate (generated amount) of purified water is sent from the second flow meter 35 to the control means 26, and the control means 26 opens and closes the second three-way valve 34 based on this measurement result. By controlling, the amount of jacket cooling water 9 taken into the fresh water generating means 3, the amount of purified water generated by the fresh water generating means 3, and the jacket cooling water returned to the jacket cooling water circulation path 20 from the fresh water return flow path 33. The amount of heat 9 and thus the amount of heat recovered from the jacket cooling water 9 is adjusted by the fresh water generating means 3.

  Next, the heated jacket cooling water 9 after cooling the jacket is also sent to the second exhaust heat recovery unit 10 of the power generation means 2 from the power supply / feed passage 27 to exchange heat with the organic medium 11. To evaporate the organic medium 11. The vapor of the organic medium 11 is sent to the low pressure side of the power turbine 12, and the power turbine 12 is rotated by the energy and electric power is generated by the generator 13.

  Further, the jacket cooling water 9 recovered by the second exhaust heat recovery unit 10 is returned from the power generation return flow path 28 to the jacket cooling water circulation path 20. At this time, the temperature of the jacket cooling water 9 returned from the power generation return flow path 28 to the jacket cooling water circulation path 20 is measured by the second temperature measuring means 31 and the measurement result is sent to the control means 26. Based on the result, the control means 26 controls the opening / closing drive of the opening / closing valve 29. Thereby, the amount of jacket cooling water 9 taken into the power generation means 2, the amount of jacket cooling water 9 returned from the power generation return flow path 28 to the jacket cooling water circulation path 20, and eventually recovered from the jacket cooling water 9 by the power generation means 2. The amount of heat is adjusted.

  Further, in the exhaust heat recovery and utilization system A of the present embodiment, the jacket cooling water 9 recovered by the power generation means 2 and the fresh water generation means 3 is returned to the jacket cooling water circulation path 20 and sent to the jacket cooler 22. Jacket cooling water 9 cooled by the jacket cooler 22 is supplied to the jacket of the diesel engine 1. At this time, when the temperature of the jacket cooling water 9 (jacket inlet temperature) before being supplied to the jacket of the diesel engine 1 is measured by the first temperature measuring means 25 and this temperature is lower than a preset set temperature. The control means 26 controls the opening and closing drive of the first three-way valve 23 so that the jacket cooling water 9 is supplied to the diesel engine 1 through the bypass passage 24 without circulating the jacket cooler 22.

  Thereby, the temperature difference between the temperature of the jacket cooling water 9 supplied to the jacket of the diesel engine 1 and the temperature after the jacket is cooled does not become too large, and the diesel engine 1 is prevented from being damaged.

  Further, in the exhaust heat recovery utilization system A of the present embodiment, the control means 26 controls the opening / closing drive of the second three-way valve 34 based on the measurement result of the second flow meter 35, so The amount of heat recovered from the jacket cooling water 9 is adjusted. Further, the amount of heat recovered from the jacket cooling water 9 by the power generation means 2 is adjusted by the control means 26 controlling the opening / closing drive of the on-off valve 29 based on the measurement result of the second temperature measuring means 31. In the present embodiment, the temperature of the jacket cooling water 9 supplied to the jacket of the diesel engine 1 is adjusted by adjusting the amount of heat of the jacket cooling water 9 recovered by the power generation means 2 and the fresh water generation means 3 by the control means 26 in this way. Then, the temperature difference after cooling the jacket is prevented from becoming too large, and damage to the diesel engine 1 can be prevented more reliably.

  Furthermore, in the exhaust heat recovery utilization system A of the present embodiment, the power generation / feed passage 27 (the fresh water feed passage 32 of the fresh water generation means 3) of the power generation means 2 is replaced with the fresh water return passage 33 (power generation return flow). It is provided so as to be connected to the upstream side in the circulation direction T (diesel engine 1 side) of the jacket cooling water circulation passage 20 rather than the passage 28). For this reason, the return water of the jacket cooling water 9 after heat recovery by the fresh water generation means 3 (power generation means 2) is not taken into the power generation means 2 (fresh water generation means 3). As a result, the jacket cooling water 9 having a high temperature after cooling the jacket of the diesel engine 1 is sent to the power generation means 2 (fresh water generation means 3) as it is, and the heat is efficiently recovered.

  Further, the fresh water supply flow path 32 of the fresh water generation means 3 is provided so as to be connected to the upstream side (the diesel engine 1 side) in the flow direction T of the jacket cooling water circulation flow path 20 relative to the power generation return flow path 28. . For this reason, the return water of the jacket cooling water 9 after heat recovery by the power generation means 2 is not taken into the fresh water generation means 3. As a result, the jacket cooling water 9 having a high temperature after the jacket of the diesel engine 1 is cooled is sent to the fresh water generating means 3 as it is, and the heat is efficiently recovered.

  Here, the control method of the exhaust heat recovery utilization system A of the present embodiment by the control means 26 will be described more specifically. First, when operating only with the jacket cooler 22 (case 1), the first three-way valve 23 is set so that the measurement result of the first temperature measurement means 25 at the inlet of the diesel engine 1 becomes a preset target temperature. Controls opening and closing.

  Next, when heat recovery is not performed by the power generation means 2 and heat recovery is performed only by the fresh water generation means 3 (when power generation is not performed and only fresh water generation is performed (case 2)), the control of the case 1 is performed. In addition, the opening and closing of the second three-way valve 34 is controlled from the measurement result of the second flow meter 35 so that the necessary flow rate of purified water is obtained, and the required flow rate is adjusted.

  Next, when heat recovery is not performed by the fresh water generation means 3 and heat recovery is performed only by the power generation means 2 (when water generation is not performed and only power generation is performed (case 3)), the control of the case 1 is performed. In addition, the on / off valve 29 is controlled so as not to exceed the amount of heat that can be used by the power generation means 2. At this time, the amount of heat is calculated from the temperature of the return water of the jacket cooling water 9 from the power generation return flow path 28 and the supply amount from the power generation supply flow path 27. The amount of heat that can be used in the power generation means 2 is the amount of heat that is used in fresh water generation minus the amount of heat that can be used in the jacket cooling water 9. The available heat quantity of the jacket cooling water 9 is obtained by subtracting the temperature of the jacket inlet from the temperature of the jacket cooling water 9 at the jacket outlet (always constant) and the jacket cooling water flow rate (always constant). Furthermore, the amount of heat used in fresh water can be calculated from the amount of fresh water. That is, since enthalpy (kJ / kg) is known when the temperature is known, the amount of heat can be calculated by multiplying the flow rate (kg / s) and enthalpy (kJ / kg).

  Next, when heat recovery is performed by the fresh water generation means 3 and heat recovery is performed by the power generation means 2, the control of the case 1, case 2, and case 3 described above is combined.

  Therefore, in the exhaust heat recovery and utilization system A of the present embodiment, heat is recovered from the jacket cooling water 9 (the jacket cooling water 9 after cooling the jacket) that has been heated to cool the jacket, and this heat is used. The power generation means 2 can generate electric power, and the purified water can be generated by the fresh water generation means 3 by using the heat of the jacket cooling water 9. As a result, the heat of the jacket cooling water 9 that has not been effectively used can be recovered to generate power and produce fresh water, and the exhaust heat of the diesel engine 1 can be further effectively used.

  Further, the heat of the jacket cooling water 9 that has been heated to a high temperature by cooling the jacket is recovered by the fresh water generating means 3, and the water to be treated such as seawater is evaporated by effectively using the recovered heat to be used as drinking water. It becomes possible to produce purified water.

  Furthermore, based on the temperature measuring means 25 and 31 for measuring the temperature of the jacket cooling water 9 and the temperature of the jacket cooling water 9 measured by the temperature measuring means 25 and 31, the power generating means 2 and the fresh water generating means 3 respectively collect the temperature. By providing the control means 26 for adjusting the amount of heat of the jacket cooling water 9, heat can be recovered from the jacket cooling water 9 and effectively used while preventing the diesel engine 1 from being damaged.

  As mentioned above, although one Embodiment of the exhaust heat recovery utilization system which concerns on this invention was described, this invention is not limited to said one Embodiment, In the range which does not deviate from the meaning, it can change suitably.

  For example, in this embodiment, the fresh water supply flow path 32 and the fresh water return flow path 33 of the fresh water generation means 3 are disposed between the power generation supply flow path 27 and the power generation return flow path 28 of the power generation means 2. The jacket cooling after the water recovery means 3 recovers heat by providing the fresh water supply flow path 32 on the diesel engine 1 side (upstream side in the flow direction T) with respect to the fresh water return flow path 33. The return water of the water 9 is not taken into the power generation means 2, and the jacket cooling water 9 having a high temperature after cooling the jacket of the diesel engine 1 is sent to the power generation means 2 as it is, so that heat can be efficiently recovered. did.

  On the other hand, as shown in FIG. 3, the power generation / feed passage 27 may be provided on the downstream side in the circulation direction T of the jacket cooling water circulation passage 20 with respect to the fresh water return passage 33. For example, the power generation means 2 that generates power with the exhaust heat of the diesel engine 1 is provided in the existing exhaust heat recovery and utilization system that includes only the fresh water generation means 3 that generates purified water with the exhaust heat of the diesel engine 1. Even when configured in this way, the heat of the jacket cooling water 9 can be effectively used when the connection (installation) position of the power generation means 2 is restricted, such as when the exhaust heat recovery and utilization system A is used. Is possible.

  Further, as shown in FIG. 4, the air cooler 5 is connected to the power generation return flow path 28 of the power generation means 2, and the return water of the jacket cooling water 9 flowing through the power generation return flow path 28 using the excess heat of the air cooler 5 is returned. You may comprise so that it may heat. If comprised in this way, when the temperature of the jet cooling water 9 will fall too much, it will become possible to adjust the temperature of the jacket cooling water 9 easily and suitably using the excess heat of the air cooler 5. FIG.

  Furthermore, in this embodiment, the fresh water generating means 3 recovers the heat of the jacket cooling water 9 that has been heated after cooling the jacket, and evaporates the water to be treated such as seawater using the energy of the recovered heat. The description was made assuming that purified water used as drinking water or the like is produced.

  On the other hand, the fresh water generating means 3 may generate purified water by treating the water to be treated such as seawater with an RO membrane module (reverse osmosis membrane module) by driving a supply pump, for example.

  Further, the power generated by the power generation means 2 may be used as the power of the fresh water generation means 3 to produce purified water. In this case, the power generated by the power generation means 2 is used to cover all or part of the power consumption of the fresh water generation means 3, so that the exhaust heat of the diesel engine 1 is used to efficiently produce the power. It becomes possible to water. Moreover, it becomes possible to eliminate or reduce the electric power energy that has been separately supplied to drive the fresh water generating means 3 in the past, and to realize further energy saving.

DESCRIPTION OF SYMBOLS 1 Diesel engine 2 Electric power generation means 3 Fresh water generation means 4 Supercharger 5 Air cooler 6 Air cooling water 7 Exhaust gas 8 1st waste heat recovery device 9 Jacket cooling water 10 2nd waste heat recovery device 11 Organic medium (working medium)
12 Power Turbine 13 Generator 14 Organic Medium Circulation Route (Organic Medium Circulation System)
15 Circulating pump 16 Condenser 17 Chimney 20 Jacket cooling water circulation path (jacket cooling water circulation system)
21 Circulating pump 22 Jacket cooler 23 First three-way valve 24 Bypass path 25 First temperature measuring means 26 Control means 27 Electric power supply flow path 28 Power generation return flow path 29 On-off valve 30 First flow meter 31 Second temperature measuring means 32 Fresh water supply flow path 33 Fresh water return flow path 34 Second three-way valve 35 Second flow meter 40 Compressed air 41 Exhaust gas path 42 First exhaust gas economizer 43 Second exhaust gas economizer 44 Boiler drum water circulation pump 45 Atmospheric pressure drain tank 46 Water supply Pump 47 Steam drum A Waste heat recovery and utilization system

Claims (4)

A jacket cooling water circulation system for circulating jacket cooling water for cooling the jacket of the diesel engine;
Heat recovery means for recovering heat from the jacket cooling water heated to a high temperature by cooling the jacket;
A waste heat recovery and utilization system, comprising: a jacket for cooling the jacket to recover the heat of the jacket cooling water heated to a high temperature, and generating purified water using the heat. In the exhaust heat recovery utilization system according to claim 1,
The fresh water recovery means uses the heat energy recovered from the jacket cooling water heated to a high temperature by cooling the jacket, evaporates the water to be treated, and forms purified water. system. In the exhaust heat recovery utilization system according to claim 2,
Temperature measuring means for measuring the temperature of the jacket cooling water;
Waste heat characterized by comprising: control means for adjusting the amount of heat of the jacket cooling water recovered by the power generation means and the fresh water generation means based on the temperature of the jacket cooling water measured by the temperature measurement means. Collection and utilization system. In the exhaust heat recovery utilization system according to claim 1,
The waste heat recovery and utilization system, wherein the fresh water generating means generates purified water using the electric power generated by the power generating means.

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