A heat recovery system for cruise ships

Abstract

An embodiment of the present invention provides a heat recovery system for a cruise ship, including a diesel engine, wherein the high-temperature water generated by the diesel engine is circulated through a high-temperature water circuit, and an evaporative fresh water generator or an adsorption refrigeration and air-conditioning unit, a waste heat recovery heat exchanger, and an organic Rankine cycle power generation system are sequentially connected in series on the high-temperature water circuit to recover heat in the high-temperature water; a first temperature sensor is provided at the liquid outlet of the evaporative fresh water generator or the adsorption refrigeration and air-conditioning unit, a second temperature sensor is provided at the liquid outlet of the waste heat recovery heat exchanger, and a third temperature sensor is provided at the liquid outlet of the organic Rankine cycle power generation system, and by adjusting the set values ​​of the first temperature sensor, the second temperature sensor and the third temperature sensor, the load of the evaporative fresh water generator or the adsorption refrigeration and air-conditioning unit, the waste heat recovery heat exchanger and the organic Rankine cycle power generation system are adjusted, and the heat recovery value of the heat recovery system is controlled.

Description

Technical Field

[0001] The invention relates to the technical field of heat recovery, in particular to a heat recovery system for a cruise ship. Background Art

[0002] In the existing technology, heat recovery is either used for evaporation to make water, for user heating, or for waste heat power generation. The heat recovery optimization efficiency is not enough. The main reason is that under certain working conditions, the heat user load is not enough. For example, the heating consumption is very small under tropical conditions. If a single waste heat recovery mode is used, the excess heat will be directly wasted. Summary of the invention

[0003] In view of the above-mentioned problems existing in the prior art, an embodiment of the present invention provides a heat recovery system for a cruise ship, which simultaneously connects multiple users in series, can configure different operations under different working conditions, and then adopt different modes to realize heat recovery and utilization, thereby maximizing the energy efficiency ratio of the system and ensuring that the system parameters operate within a reasonable range.

[0004] An embodiment of the present invention provides a heat recovery system for a cruise ship, comprising:

[0005] A diesel engine, wherein the high-temperature water generated by the diesel engine is circulated through a high-temperature water circuit, wherein the high-temperature water circuit is sequentially connected in series with an evaporative fresh water generator or an adsorption refrigeration and air-conditioning unit, a waste heat recovery heat exchanger, and an organic Rankine cycle power generation system to recover the heat in the high-temperature water;

[0006] A first temperature sensor is provided at the liquid outlet of the evaporative fresh water generator or the adsorption refrigeration and air-conditioning unit, a second temperature sensor is provided at the liquid outlet of the waste heat recovery heat exchanger, and a third temperature sensor is provided at the liquid outlet of the organic Rankine cycle power generation system. By adjusting the set values ​​of the first temperature sensor, the second temperature sensor and the third temperature sensor, the load of the evaporative fresh water generator or the adsorption refrigeration and air-conditioning unit, the waste heat recovery heat exchanger and the organic Rankine cycle power generation system are adjusted, and the heat recovery value of the heat recovery system is controlled.

[0007] In some embodiments of the present invention, the temperature sensors are arranged to adopt hierarchical control to recover the heat of the heat recovery system to the maximum extent.

[0008] In some embodiments of the present invention, a plate cooler and a terminal temperature sensor are provided at the end of the high-temperature water circuit to control the high-temperature water inlet temperature of the diesel engine.

[0009] In some embodiments of the present invention, by increasing the outlet temperature of the plate cooler, the temperature of the high-temperature water outlet of the diesel engine can be increased, thereby increasing the heat exchange efficiency of the evaporative fresh water generator or the adsorption refrigeration and air-conditioning unit, the waste heat recovery heat exchanger, and the organic Rankine cycle power generation system.

[0010] In some embodiments of the present invention, one end of the waste heat recovery heat exchanger is connected to a plurality of heating users arranged in parallel, and the other end is connected to a waste heat recovery hot water pump and a pressure difference sensor arranged in parallel, and the plurality of heating users arranged in parallel are connected in series with the waste heat recovery hot water pump and the pressure difference sensor arranged in parallel, thereby forming a waste heat recovery hot water loop;

[0011] Wherein, the waste heat recovery hot water circuit adopts frequency conversion control.

[0012] In some embodiments of the present invention, the differential pressure sensor is specifically arranged at the inlet and outlet of the waste heat recovery hot water pump to detect the inlet pressure and outlet pressure of the waste heat recovery hot water pump, and then control the speed of the waste heat recovery hot water pump through the detected pressure signal.

[0013] In some embodiments of the present invention, excess steam is added to the organic Rankine cycle corresponding to the organic Rankine cycle power generation system to heat the organic matter.

[0014] In some embodiments of the present invention, in the high-temperature water circuit, after the organic Rankine cycle power generation system, a high-temperature water cooler and a high-temperature cooling water delivery pump are sequentially connected in series, and the high-temperature cooling water delivery pump delivers the cooled high-temperature cooling water back to the high-temperature water inlet of the diesel engine.

[0015] In some embodiments of the present invention, a fourth temperature sensor is further provided at the liquid inlet of the evaporative fresh water generator or the adsorption refrigeration and air-conditioning unit. By setting the set value of the fourth temperature sensor, the load of the evaporative fresh water generator or the adsorption refrigeration and air-conditioning unit, the waste heat recovery heat exchanger and the organic Rankine cycle power generation system are adjusted to further control the heat recovery value of the heat recovery system.

[0016] In some embodiments of the present invention, a fifth temperature sensor is provided at the liquid outlet of the high-temperature water cooler.

[0017] Compared with the prior art, the beneficial effect of the heat recovery system for cruise ships provided by the embodiment of the present invention is that it connects multiple users in series at the same time, can configure different operations under different working conditions, and then adopt different modes to achieve heat recovery and utilization, thereby maximizing the energy efficiency ratio of the system and ensuring that the system parameters operate within a reasonable range.

[0018] Diesel generators are commonly used on luxury cruise ships. The exhaust gas and cooling water they generate contain a lot of heat. In order to improve the heat utilization rate of the entire system and reduce the cost commission brought about by the increase in fuel costs, this system can efficiently recover the heat in the high-temperature cooling water of the diesel engine, maximize the recovery of waste heat in the high-temperature cooling water, and effectively reduce the system energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a heat recovery system for a cruise ship provided by an embodiment of the present invention.

[0020] Reference numerals

[0021] 1. Diesel engine; 2. Evaporative fresh water generator; 3. Waste heat recovery heat exchanger; 4. Organic Rankine cycle power generation system; 5. First temperature sensor; 6. Second temperature sensor; 7. Third temperature sensor; 8. Heating user; 9. Waste heat recovery hot water pump; 10. Pressure difference sensor; 11. High temperature water cooler; 12. High temperature cooling water delivery pump; 13. Fourth temperature sensor; 14. Fifth temperature sensor. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0024] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0025] It should also be understood that, although the present application has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0026] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0027] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to determine the true intent based on the user's historical operations and to avoid unnecessary or redundant details that make the present application unclear. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but are merely used as the basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0028] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0029] The embodiment of the present invention provides a heat recovery system for a cruise ship, such as Figure 1 As shown, it specifically includes a diesel engine 1, and an evaporative fresh water generator 2 (or an adsorption refrigeration and air conditioning unit) arranged in sequence along a high-temperature water circuit through which the high-temperature water generated by the diesel engine 1 circulates, a waste heat recovery heat exchanger 3, an organic Rankine cycle power generation system 4, a high-temperature water cooler 11 and a high-temperature cooling water delivery pump 12;

[0030] Specifically, the high-temperature cooling water from the diesel engine 1 passes through the evaporative fresh water generator 2 (or adsorption refrigeration air conditioning unit), the waste heat recovery heat exchanger 3, the organic Rankine cycle power generation system 4 and the high-temperature water cooler 11 in sequence, and finally reaches the high-temperature cooling water delivery pump 12, and the high-temperature cooling water delivery pump 12 delivers the cooled high-temperature cooling water back to the high-temperature water inlet of the diesel engine 1 to complete the cycle;

[0031] Among them, the evaporative fresh water generator 2 (or adsorption refrigeration air conditioning unit), the waste heat recovery heat exchanger 3 and the organic Rankine cycle power generation system 4 which are arranged in series in the high-temperature water loop are all used to recover the heat in the high-temperature water;

[0032] At the same time, a first temperature sensor 5 is provided at the liquid outlet of the evaporative fresh water generator 2 (or adsorption refrigeration and air conditioning unit), a second temperature sensor 6 is provided at the liquid outlet of the waste heat recovery heat exchanger 3, and a third temperature sensor 7 is provided at the liquid outlet of the organic Rankine cycle power generation system 4. By adjusting the set values ​​of the first temperature sensor 5, the second temperature sensor 6 and the third temperature sensor 7, the load of the evaporative fresh water generator 2 (or adsorption refrigeration and air conditioning unit), the waste heat recovery heat exchanger 3 and the organic Rankine cycle power generation system 4 is adjusted to control the heat recovery value of the heat recovery system;

[0033] Furthermore, a fourth temperature sensor 13 is provided at the liquid inlet of the evaporative fresh water generator 2 (or the adsorption refrigeration and air-conditioning unit), and a fifth temperature sensor 14 is provided at the liquid outlet of the high-temperature water cooler 11. By setting the set value of the fourth temperature sensor 13, the load of the evaporative fresh water generator 2 (or the adsorption refrigeration and air-conditioning unit), the waste heat recovery heat exchanger 3 and the organic Rankine cycle power generation system 4 can be adjusted to further control the heat recovery value of the heat recovery system. In addition, the cooling control of the high-temperature water is achieved by adjusting the fifth temperature sensor 14.

[0034] In this embodiment, the evaporative fresh water generator 2 (or adsorption refrigeration and air-conditioning unit), the waste heat recovery heat exchanger 3 and the organic Rankine cycle power generation system 4 are also respectively provided with bypass valves to achieve short-circuiting of any of the three parts of the evaporative fresh water generator 2 (or adsorption refrigeration and air-conditioning unit), the waste heat recovery heat exchanger 3 and the organic Rankine cycle power generation system 4, that is, closing is achieved through the corresponding bypass valve, so as to achieve optimal operation under different working conditions and reduce the total fuel consumption.

[0035] In the evaporative fresh water generator 2 in the above embodiment, seawater is heated by waste heat to vaporize and then condense into distilled water, which can be used for technical water and drinking water, thereby realizing the conversion of waste heat into water; in the waste heat recovery heat exchanger 3, the heated hot water is sent to various heating users 8 through the waste heat recovery hot water pump 9, which may include air conditioning water heating, kitchen heating, drinking water heating, technical water heating, etc., and finally returns to the inlet of the waste heat recovery heat exchanger 3 to complete the cycle, thereby realizing the conversion of waste heat into heat (useful thermal energy); similarly, in the organic Rankine cycle power generation system 4, the organic Rankine cycle corresponding to the organic Rankine cycle power generation system 4 is added with excess steam to heat organic matter to improve the system efficiency, and the organic matter is heated by high-temperature water waste heat and excess steam, so that it is vaporized and does work in the expander, and the thermal energy is converted into mechanical energy, and the mechanical energy is converted into electrical energy through the motor, thereby realizing the conversion of waste heat into electricity.

[0036] That is, under different working conditions, high-temperature cooling water waste heat recovery can adjust different loads in the three modes of water / heat / electricity to achieve system optimization.

[0037] In this embodiment, the temperature sensors are arranged to adopt hierarchical control to recover the heat of the heat recovery system to the maximum extent.

[0038] Furthermore, in this embodiment, a plate cooler and a terminal temperature sensor are provided at the end of the high-temperature water circuit to control the high-temperature water inlet temperature of the diesel engine 1 , thereby ensuring a suitable high-temperature water inlet temperature of the diesel engine 1 .

[0039] By reasonably increasing the outlet temperature of the plate cooler, the temperature of the high-temperature water outlet of the diesel engine 1 can be increased, thereby increasing the heat exchange efficiency of the evaporative fresh water generator 2 (or adsorption refrigeration and air-conditioning unit), the waste heat recovery heat exchanger 3, and the organic Rankine cycle power generation system 4.

[0040] In this embodiment, one end of the waste heat recovery heat exchanger 3 is connected to a plurality of heating users 8 arranged in parallel, and the other end is connected to a waste heat recovery hot water pump 9 and a pressure difference sensor 10 arranged in parallel. The plurality of heating users 8 arranged in parallel and the waste heat recovery hot water pump 9 and the pressure difference sensor 10 arranged in parallel are arranged in series to form a waste heat recovery hot water loop; wherein the waste heat recovery hot water loop adopts frequency conversion control to reduce the power of the waste heat recovery hot water pump 9 and improve the energy efficiency ratio of the entire system.

[0041] In some embodiments of the present invention, the differential pressure sensor 10 is specifically arranged at the inlet and outlet of the waste heat recovery hot water pump 9 to detect the inlet pressure and outlet pressure of the waste heat recovery hot water pump 9, and then control the speed of the waste heat recovery hot water pump 9 through the detected pressure signal.

[0042] It can be seen from the above technical solution that the heat recovery system for a cruise ship provided by the above embodiment of the present invention can simultaneously connect multiple users in series, and can configure different operations under different working conditions, and then adopt different modes to achieve heat recovery and utilization, thereby maximizing the energy efficiency ratio of the system and ensuring that the system parameters operate within a reasonable range.

[0043] Diesel generators are commonly used on luxury cruise ships. The exhaust gas and cooling water they generate contain a lot of heat. In order to improve the heat utilization rate of the entire system and reduce the cost commission brought about by the increase in fuel costs, this system can efficiently recover the heat in the high-temperature cooling water of the diesel engine 1, maximize the recovery of waste heat in the high-temperature cooling water, and effectively reduce the system energy efficiency.

[0044] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A heat recovery system for a cruise ship, characterized in that: include: A diesel engine, wherein the high-temperature water generated by the diesel engine is circulated through a high-temperature water circuit, wherein the high-temperature water circuit is sequentially connected in series with an evaporative fresh water generator or an adsorption refrigeration and air-conditioning unit, a waste heat recovery heat exchanger, and an organic Rankine cycle power generation system to recover the heat in the high-temperature water; A first temperature sensor is provided at the liquid outlet of the evaporative fresh water generator or the adsorption refrigeration and air-conditioning unit, a second temperature sensor is provided at the liquid outlet of the waste heat recovery heat exchanger, and a third temperature sensor is provided at the liquid outlet of the organic Rankine cycle power generation system. By adjusting the set values ​​of the first temperature sensor, the second temperature sensor and the third temperature sensor, the load of the evaporative fresh water generator or the adsorption refrigeration and air-conditioning unit, the waste heat recovery heat exchanger and the organic Rankine cycle power generation system are adjusted, and the heat recovery value of the heat recovery system is controlled.

2. The heat recovery system for a cruise ship according to claim 1, characterized in that: The temperature sensors are arranged to adopt hierarchical control to recover the heat of the heat recovery system to the maximum extent.

3. The heat recovery system for a cruise ship according to claim 2, characterized in that: A plate cooler and a terminal temperature sensor are provided at the end of the high-temperature water circuit to control the high-temperature water inlet temperature of the diesel engine.

4. The heat recovery system for a cruise ship according to claim 3, characterized in that: By increasing the outlet temperature of the plate cooler, the temperature of the high-temperature water outlet of the diesel engine can be increased, thereby increasing the heat exchange efficiency of the evaporative fresh water generator or the adsorption refrigeration and air-conditioning unit, the waste heat recovery heat exchanger, and the organic Rankine cycle power generation system.

5. The heat recovery system for a cruise ship according to claim 4, characterized in that: One end of the waste heat recovery heat exchanger is connected to a plurality of heating users arranged in parallel, and the other end is connected to a waste heat recovery hot water pump and a pressure difference sensor arranged in parallel. The plurality of heating users arranged in parallel are connected in series with the waste heat recovery hot water pump and the pressure difference sensor arranged in parallel, thereby forming a waste heat recovery hot water loop; Wherein, the waste heat recovery hot water circuit adopts frequency conversion control.

6. The heat recovery system for a cruise ship according to claim 5, characterized in that: The differential pressure sensor is specifically arranged at the inlet and outlet of the waste heat recovery hot water pump to detect the inlet pressure and outlet pressure of the waste heat recovery hot water pump, and then control the speed of the waste heat recovery hot water pump through the detected pressure signal.

7. The heat recovery system for a cruise ship according to claim 6, characterized in that: In the organic Rankine cycle corresponding to the organic Rankine cycle power generation system, excess steam is added to heat the organic matter.

8. The heat recovery system for a cruise ship according to claim 7, characterized in that: In the high-temperature water circuit, after the organic Rankine cycle power generation system, a high-temperature water cooler and a high-temperature cooling water delivery pump are sequentially connected in series, and the high-temperature cooling water delivery pump delivers the cooled high-temperature cooling water back to the high-temperature water inlet of the diesel engine.

9. The heat recovery system for a cruise ship according to claim 8, characterized in that: A fourth temperature sensor is also provided at the liquid inlet of the evaporative fresh water generator or the adsorption refrigeration and air-conditioning unit. By setting the set value of the fourth temperature sensor, the load of the evaporative fresh water generator or the adsorption refrigeration and air-conditioning unit, the waste heat recovery heat exchanger and the organic Rankine cycle power generation system are adjusted to further control the heat recovery value of the heat recovery system.

10. The heat recovery system for a cruise ship according to claim 9, characterized in that: A fifth temperature sensor is provided at the liquid outlet of the high-temperature water cooler.

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