CN109162784B - System for performing combined cooling and heating supply by using waste heat of marine diesel engine and using method thereof - Google Patents

System for performing combined cooling and heating supply by using waste heat of marine diesel engine and using method thereof Download PDF

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Publication number
CN109162784B
CN109162784B CN201811012595.7A CN201811012595A CN109162784B CN 109162784 B CN109162784 B CN 109162784B CN 201811012595 A CN201811012595 A CN 201811012595A CN 109162784 B CN109162784 B CN 109162784B
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water
heat exchanger
pipe
temperature
hot water
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CN109162784A (en
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高豪杰
常家起
张淼
熊新
郑竹安
金丽珠
樊永胜
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Yancheng Institute of Technology
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Yancheng Institute of Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/006—Auxiliaries or details not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

The invention discloses a system for carrying out combined cooling and heating supply by utilizing waste heat of a marine diesel engine, which comprises a heating radiator, a heat exchanger I, a heat exchanger II, a lithium bromide refrigerating unit and a condenser which are sequentially connected by a preset pipeline, and further comprises a first hot water storage tank and a second hot water storage tank; the heat exchanger I is used for heat exchange between tap water and cylinder sleeve water and is connected with the second hot water storage tank; the heat exchanger II is used for heat exchange between tap water and high-temperature flue gas; the lithium bromide refrigerating unit is used for refrigerating by taking high-temperature water vapor as a heat source; the condenser is respectively connected with the heat exchanger II and the first hot water storage tank; the hot water of the first hot water storage tank and the hot water of the second hot water storage tank are firstly converged in the pipeline and then are respectively connected with the heating radiators or are directly used for domestic hot water. The invention provides the use method of the system through opening and closing the pipeline throttle valve, enhances the refrigeration or heating function according to the environment of the ship, also provides domestic hot water for crews, has no pollution discharge, has high utilization rate of waste heat and afterheat and saves the cost.

Description

System for performing combined cooling and heating supply by using waste heat of marine diesel engine and using method thereof
Technical Field
The invention belongs to the field of waste heat recovery and utilization of waste heat of internal combustion engines, and particularly relates to a system for carrying out combined cooling and heating supply by utilizing waste heat of a marine diesel engine and a using method thereof.
Background
At present, over 80% of the global trade is completed by ship transportation, and most ships are driven by diesel engines. According to statistics, large civil ships carrying more than 100 tons of global loads consume 5-10 hundred million tons of petroleum fuel every year. However, the thermal efficiency of marine diesel engines is only 40-50%, and a large proportion of the energy is lost in the form of cooling water and flue gas. At present, the waste heat utilization technology of large diesel engines is still in an exploration stage, and if an efficient waste heat recovery process and an efficient waste heat recovery system can be developed, the heat in tail gas and cooling liquid is fully utilized, the overall heat efficiency of the marine diesel engine can be greatly improved, and fuel is saved. Therefore, the key path for improving the overall thermal efficiency of the diesel engine is to develop the waste heat recovery of the diesel engine and to develop efficient waste heat recovery and utilization technologies, equipment and systems. Rankine organic cycle waste heat recovery research is carried out on a large two-stroke marine diesel engine by a beam friend for taking power generation as a main purpose, thermodynamic performance analysis is carried out, and although the overall thermal efficiency of the diesel engine is improved (beam friend, theoretical optimization and experimental research [ D ], Tianjin university, 2014) of the waste heat recovery thermodynamic cycle of the marine engine, the efficiency of a waste heat recovery system is not high, and the operation of a power generation system is complex and the cost is high.
In the prior art, in the invention patent 'an engine waste heat comprehensive recovery system' with the application number of 2016108807268, the heat of automobile exhaust and cooling liquid is utilized for refrigeration, heating and power generation, so that the heat efficiency of the system is improved; however, due to the limitation of the space of the automobile body and the weight of the system, the system cannot adopt a high-efficiency heat exchanger and a pipeline control system, and cannot generate domestic hot water which can be directly used by people, so that the recovery rate of the waste heat of the tail gas and the cooling liquid is not high, and the application range of the system is greatly limited. The patent application number is 2015210910959 "a thermoelectric integrated energy supply system", this system adopts equipment such as two sets of parallelly connected flue gas waste heat lithium bromide machines, air source heat pump unit, high temperature cylinder liner inter-water plate heat exchanger, utilize the high-temperature water that cold warm water and gas generating set produced, part high temperature flue gas carries out the heat transfer, cold warm water after the heat exchange uses as life hot water, however this kind of system fails the waste heat of utilizing high temperature flue gas and high-temperature water completely, only can produce life hot water and use, fail the waste heat utilization mode that realizes cold and hot confession, waste heat return water utilization's mode is single.
The large ship has sufficient space and a large number of crews, has large requirements on heat and cold, can realize the functions of supplying hot water, heating, refrigerating (air conditioning, refrigeration) and the like to the cabin by utilizing the waste heat of the marine diesel engine, has wide application prospect, and improves the heat efficiency of the marine diesel engine.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a system for performing combined cooling and heating by using waste heat of a marine diesel engine, and the specific technical scheme is as follows.
A system for carrying out combined cooling and heating supply by utilizing waste heat of a marine diesel engine comprises a heating radiator, a heat exchanger I, a heat exchanger II, a lithium bromide refrigerating unit and a condenser which are sequentially connected by a preset pipeline, and further comprises a first hot water storage tank and a second hot water storage tank;
the heat exchanger I is additionally provided with water pipes I, II and III which are respectively used for tap water b1Inflow of cylinder liner water a1Inflow and liner water a2Flowing out; the heat exchanger I is connected with the second hot water storage tank through a water pipe IV;
the heat exchanger II is provided with air pipes I and II which are respectively used for flue gas c1Inflow and flue gas c2Flowing out;
air pipes III and IV are additionally arranged on the lithium bromide refrigerating unit and are respectively used for air d1Inflow and air d2Flowing out;
a water pipe V is additionally arranged on the condenser, a water pump is arranged on the water pipe V, the water pipe V is branched into a branch pipe I and a branch pipe II, the branch pipe I is connected with the heat exchanger II, and the branch pipe II is connected with the first hot water storage tank;
a branch pipe IV and a branch pipe III are respectively arranged on the first hot water storage tank and the second hot water storage tank, and a water pump is respectively arranged on the branch pipe III and the branch pipe IV; the branch pipes III and IV are merged and then branched to form a water pipe VI and a water pipe VII, the water pipe VI is connected with the heating radiator, and the water pipe VII is used for domestic hot water;
on the pipeline of predetermineeing between heat exchanger I and the heat exchanger II, and all be equipped with the choke valve on the pipeline of predetermineeing between heat exchanger II and the lithium bromide refrigerating unit, establish the choke valve on water pipe I, IV, VI, the VII branch, establish the choke valve on branch pipe I, II, III, IV branch.
In the system, the temperature of the cylinder sleeve water entering the heat exchanger I is 70-90 ℃, and tap water b can be used1Heating to 50-70 ℃, cooling and then cooling to obtain low-temperature cylinder liner water a2The temperature of the cylinder sleeve is 30-50 ℃, and the heat is directly returned to the cylinder sleeve of the diesel engine, so that the traditional cooler is omitted, the equipment cost is saved, the heat contained in the cylinder sleeve water is recovered, and the overall heat efficiency is improved.
And the heat exchanger II is used for recovering the waste heat of the tail gas of the diesel engine. Flue gas c entering heat exchanger II1The temperature is 400-700 ℃, and the outflowing flue gas c2The temperature is 300-500 ℃, and tap water b from the heat exchanger I is used2Further heating to 0.8-2.0MPa of water vapor e1。
The condenser cools the water-vapor mixture e2Condensing the mixture into tap water b at the temperature of 80-95 DEG C3Tap water b3One part of the heat enters the heat exchanger II again, so that the heat efficiency of the circulation is greatly improved, and most of heat is effectively utilized; the other part enters the first hot water storage tank.
Hot water in the first hot water storage tank and the second hot water storage tank is converged through a pipeline, one part of the hot water is conveyed to a radiator through a water pump to heat a cabin, and the other part of the hot water is conveyed to living facilities such as a water heater to provide daily life water for crews.
The invention also provides a using method of the system, which comprises the following steps of carrying out a conventional mode:
s1 high-temperature cylinder liner water a in diesel engine1Normal temperature tap water b1Respectively enters the heat exchanger I through the water pipes I and II, and then the low-temperature cylinder liner water a is obtained after heat exchange2Flows back to the diesel engine through a water pipe III to form circulation; high-temperature tap water b2One part of the water flows into a heat exchanger II from a preset pipeline, and the other part of the water flows into a second hot water storage tank through a water pipe IV;
s2 high-temperature flue gas c generated by diesel engine1Flowing into heat exchanger II through air pipe I, exchanging heat, and flowing into high-temperature tap water b2Is heated to become highGrade of steam e1Low temperature flue gas c2High grade steam e discharged through the air pipe II1Entering a lithium bromide refrigerating unit through a preset pipeline;
s3, normal temperature air d1Flows into the lithium bromide refrigerating unit through an air pipe III and then is converted into low-temperature air d2High grade steam e flowing out through the air pipe IV1Water-vapor mixture e converted to low grade2And flows into a condenser through a preset pipeline;
s4 Low-grade water-vapor mixture e2Tap water b converted to high temperature in condenser3(ii) a High-temperature tap water b3One part of the water flows back into the heat exchanger II through the branch pipe I under the action of a water pump, and the other part flows into the first hot water storage tank through the branch pipe II;
s5 tap water b of second hot water storage tank with part of high temperature2And tap water b of the first hot water storage tank with a part of high temperature3Respectively mixed by branch pipes III and IV to form high-temperature tap water b4Then respectively flows into the radiator through water pipes VI and VII to be used as domestic hot water for heating.
As another using method, the invention also provides a using method of the refrigerating mode of the system, which comprises the following steps:
p1 high-temperature cylinder liner water a in diesel engine1Normal temperature tap water b1Respectively enters the heat exchanger I through the water pipes I and II, and then the low-temperature cylinder liner water a is obtained after heat exchange2Flows back to the diesel engine through a water pipe III to form circulation; closing the throttle valve on the water pipe IV and the high-temperature tap water b2All the water flows into a heat exchanger II from a preset pipeline;
p2 high-temperature flue gas c generated by diesel engine1Flows into a heat exchanger II through an air pipe I, and then high-temperature tap water b is obtained after heat exchange2Heated to high grade steam e1Low temperature flue gas c2High grade steam e discharged through the air pipe II1Entering a lithium bromide refrigerating unit through a preset pipeline;
p3, Normal temperature air d1Flows into a lithium bromide refrigerating unit through an air pipe III and then is convertedAir at low temperature d2High grade steam e flowing out through the air pipe IV1Water-vapor mixture e converted to low grade2And flows into a condenser through a preset pipeline;
p4, low-grade water-steam mixture e2Tap water b converted to high temperature in condenser3(ii) a High-temperature tap water b3Most of the water flows back into the heat exchanger II through the branch pipe I under the action of a water pump, and the least of the water flows into the first hot water storage tank through the branch pipe II;
p5, closing throttle valve on branch pipe III and water pipe VI, and storing a small part of high-temperature tap water b in first hot water storage tank3Flows out as domestic hot water through a branch pipe IV and a water pipe VII.
Preferably, a water pipe VIII is further arranged on the heat exchanger II in the system, a water pipe IX is connected between the heat exchanger II and the first hot water storage tank, and throttle valves are respectively arranged on the water pipes VIII and IX.
The invention provides a method for using a heating mode of the preferable system, which comprises the following steps:
q1 high-temperature cylinder liner water a in diesel engine1Normal temperature tap water b1Respectively enters the heat exchanger I through the water pipes I and II, and then the low-temperature cylinder liner water a is obtained after heat exchange2Flows back to the diesel engine through a water pipe III to form circulation; closing a throttle valve on a preset pipeline between the heat exchanger I and the heat exchanger II and high-temperature tap water b2All the water flows into a second hot water storage tank through a water pipe IV;
q2, and normal temperature tap water b4Flows into a heat exchanger II through a water pipe VIII, and high-temperature flue gas c generated by the diesel engine1Flowing into heat exchanger II through air pipe I, exchanging heat, and collecting tap water b at normal temperature4Tap water b heated to high temperature5(ii) a Closing throttle valve between heat exchanger II and lithium bromide refrigerating unit, and high-temperature tap water b5All flows into the first hot water storage tank;
q3, high-temperature tap water b in second hot water tank2And high-temperature tap water b in the first hot water storage tank5Respectively mixed by branch pipes III and IV to form high-temperature tap water b6Is divided intoFlows into the radiator through water pipes VI and VII to be used as domestic hot water for heating.
Preferably, in the system, the heat exchanger I is a plate heat exchanger, and the heat exchanger II is a heat pipe type waste heat recovery heat exchanger.
Compared with the prior art, the invention has the beneficial effects that:
1. the system can effectively recover the low-grade waste heat of the cylinder liner water of the diesel engine by a graded utilization mode, the heat exchanger I becomes a cooler of the cylinder liner water of the diesel engine, the traditional cooler is omitted, meanwhile, the heat contained in the cylinder liner water is effectively utilized, the cost is reduced, and the heat efficiency is improved;
2. the system can flexibly adjust the use of the system according to the environment of the ship, can refrigerate the cabin, heat the cabin, and provide domestic hot water for crews, has multiple uses, and saves the cost of the device;
3. in the whole operation process of the system, tap water is used as a heat absorption medium and a heat release medium, no pollutant is discharged, and meanwhile, most of tap water is repeatedly recycled in the system, so that the water consumption of ships is saved.
Drawings
Fig. 1 is a schematic structural diagram of a system for combined cooling and heating by using waste heat of a marine diesel engine according to embodiment 1;
fig. 2 is a schematic structural diagram of a system for combined cooling and heating by using waste heat of a marine diesel engine according to embodiment 2;
in the figure: 1. heating radiators; 2. a plate heat exchanger; 3. a heat pipe type waste heat recovery heat exchanger; 4. a lithium bromide refrigeration unit; 5. a condenser; 6. a first hot water storage tank; 7. a second hot water storage tank; 801. a water pipe I; 802. a water pipe II; 803. a water pipe III; 804. a water pipe IV; 805. a water pipe V; 806. a water pipe VI; 807. a water pipe VII; 808. a water pipe VIII; 809. a water pipe IX; 901. a trachea I; 902. a trachea II; 903. a trachea III; 904. a trachea IV; 1001. a branch pipe I; 1002. a branch pipe II; 1003. a branch pipe III; 1004. and a branch pipe IV.
Detailed Description
The technical solutions of the embodiments in this patent will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments, not all embodiments, of this patent. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the patent without making creative efforts, shall fall within the protection scope of the patent.
In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the patent and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the patent. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of this patent, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. It is to be noted that all the figures are exemplary representations. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.
The patent is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Example 1
As shown in fig. 1, the system for combined cooling and heating by using waste heat of a marine diesel engine provided in this embodiment includes a radiator (1), a plate heat exchanger (2), a heat pipe type waste heat recovery heat exchanger (3), a lithium bromide refrigerating unit (4), a condenser (5), a first hot water storage tank (6), and a second hot water storage tank (7) which are connected in sequence by a preset pipeline;
the plate heat exchanger (2) is additionally provided with a water pipe I (801), a water pipe II (802) and a water pipe III (803) which are respectively used for tap water b1Inflow of cylinder liner water a1Inflow cylinder liner water a2Flowing out; the plate heat exchanger (2) is connected with the second hot water storage tank (7) through a water pipe IV (804);
the heat pipe type waste heat recovery heat exchanger (3) is provided with an air pipe I (901) and an air pipe II (902) which are respectively used for flue gas c1Inflow and flue gas c2Flowing out;
an air pipe III (903) and an air pipe IV (904) are additionally arranged on the lithium bromide refrigerating unit (4) and are respectively used for air d1Inflow and air d2Flowing out;
a water pipe V (805) is additionally arranged on the condenser (5), a water pump is arranged on the water pipe V (805), the water pipe V is branched into a branch pipe I (1001) and a branch pipe II (1002), the branch pipe I (1001) is connected with the heat pipe type waste heat recovery heat exchanger (3), and the branch pipe II (1002) is connected with the first hot water storage tank (6);
a branch pipe IV (1004) and a branch pipe III (1003) are additionally arranged on the first hot water storage tank (6) and the second hot water storage tank (7) respectively, and water pumps are arranged on the branch pipe III (1003) and the branch pipe IV (1004) respectively; the branch pipe III (1003) and the branch pipe IV (1004) are merged and then branched to form a water pipe VI (806) and a water pipe VII (807), the water pipe VI (806) is connected with the heating radiator (1), and the water pipe VII (807) is used for domestic hot water;
the plate heat exchanger (2) and the heat pipe type waste heat recovery heat exchanger (3) are arranged on a preset pipeline respectively, the throttle valves are arranged on the water pipe I (801), the water pipe IV (804), the water pipe VI (806) and the water pipe VII (807) respectively, and the throttle valves are arranged on the branch pipe I (1001), the branch pipe II (1002), the branch pipe III (1003) and the branch pipe IV (1004) respectively.
When the system is used, the following use modes are adopted:
s1, 90 ℃ high-temperature cylinder liner water a in diesel engine1Normal temperature tap water b1Respectively enters the plate heat exchanger through water pipes I and II and is subjected to heat exchangeThen, the liner water a was cooled to a low temperature of 40 ℃2Flows back to the diesel engine through a water pipe III to form circulation; tap water b heated to a high temperature of 65 ℃2One part of the waste heat flows into the heat pipe type waste heat recovery heat exchanger from the preset pipeline, and the other part of the waste heat flows into the second hot water storage tank through the water pipe IV;
s2 high-temperature flue gas c with the temperature of 600 ℃ generated by diesel engine1The high-temperature tap water b flows into the heat pipe type waste heat recovery heat exchanger through the air pipe I and flows into the heat pipe type waste heat recovery heat exchanger after heat exchange2Heated to become high-grade water vapor e of 0.8-2.0MPa1Low temperature flue gas c2High grade steam e discharged through the air pipe II1Entering a lithium bromide refrigerating unit through a preset pipeline;
s3, normal temperature air d1Flows into the lithium bromide refrigerating unit through an air pipe III and then is converted into low-temperature air d2High grade steam e flowing out through the air pipe IV1Water-vapor mixture e converted to low grade2And flows into a condenser through a preset pipeline;
s4 Low-grade water-vapor mixture e2Converted in a condenser to tap water b at a high temperature of 90 ℃3(ii) a High-temperature tap water b3One part of the waste heat recovery device reflows into the heat pipe type waste heat recovery heat exchanger through the branch pipe I under the action of the water pump, and the other part of the waste heat recovery device reflows into the first hot water storage tank through the branch pipe II;
s5 tap water b of second hot water storage tank with part of high temperature2And tap water b of the first hot water storage tank with a part of high temperature3Respectively mixed by branch pipes III and IV to form high-temperature tap water b4Then respectively flows into the radiator through water pipes VI and VII to be used as domestic hot water for heating.
The system for supplying cold and heat by using the waste heat of the marine diesel engine provided by the embodiment utilizes the waste heat of cylinder liner water and the waste heat of flue gas of the diesel engine to the maximum extent, reduces the cost and has very high waste heat utilization rate; the water tank can not only refrigerate, but also heat, provide warm and comfortable cabin environment for crews, and simultaneously provide domestic hot water; the method has no waste pollution, is low-carbon and environment-friendly, and saves the fresh water consumption of the ship.
Example 2
As shown in fig. 2, in order to provide better cooling and heating effects, the system for combined cooling and heating by using the waste heat of the marine diesel engine provided in this embodiment is improved based on embodiment 1 as follows: a water pipe VIII (808) is further arranged on the heat pipe type waste heat recovery heat exchanger (3) in the system, a water pipe IX (809) is connected between the heat pipe type waste heat recovery heat exchanger (3) and the first hot water storage tank (6), and throttle valves are respectively arranged on the water pipe VIII (808) and the water pipe IX (809).
Through the improvement, the system of the embodiment can realize the targeted adjustment of hot or cold environments by closing certain throttle valves, and can provide a correspondingly more comfortable cabin living environment.
When the ambient climate is hot, the following mode is adopted, the refrigerating effect of the cabin is further improved, and meanwhile, enough domestic hot water can be provided.
P1 cylinder liner water a with high temperature of 90 ℃ in diesel engine1Normal temperature tap water b1Respectively enters the plate heat exchanger through the water pipes I and II, is cooled to 40 ℃ low temperature cylinder liner water a after heat exchange2Flows back to the diesel engine through a water pipe III to form circulation; closing throttle valves on the water pipes IV and VIII, and heating the tap water b to the high temperature of 65 DEG C2All the waste heat flows into the heat pipe type waste heat recovery heat exchanger from a preset pipeline;
p2 high-temperature flue gas c with 600 ℃ generated by diesel engine1Flows into the heat pipe type waste heat recovery heat exchanger through the air pipe I, and then high-temperature tap water b is obtained after heat exchange2Heated to high grade steam e1Low temperature flue gas c2Discharging through air pipe II, closing throttle valve on water pipe IX, and high-grade steam e1Entering a lithium bromide refrigerating unit through a preset pipeline;
p3, Normal temperature air d1Flows into the lithium bromide refrigerating unit through an air pipe III and then is converted into low-temperature air d2High grade steam e flowing out through the air pipe IV1Water-vapor mixture e converted to low grade2And flows into a condenser through a preset pipeline;
P4、low-grade water-vapour mixture e2Converted in a condenser to tap water b at a high temperature of 90 ℃3(ii) a High-temperature tap water b3Most of the waste heat is refluxed into the heat pipe type waste heat recovery heat exchanger through the branch pipe I under the action of the water pump, and the least of the waste heat flows into the first hot water storage tank through the branch pipe II;
p5, closing throttle valve on branch pipe III and water pipe VI, and storing a small part of high-temperature tap water b in first hot water storage tank3Flows out as domestic hot water through a branch pipe IV and a water pipe VII.
When the surrounding climate is cold, the operation is carried out in the following way, and sufficient domestic hot water can be provided while the heating effect of the cabin is further improved.
Q1 cylinder liner water a with high temperature of 90 ℃ in diesel engine1Normal temperature tap water b1Respectively enters the plate heat exchanger through the water pipes I and II, is cooled to 40 ℃ low temperature cylinder liner water a after heat exchange2Flows back to the diesel engine through a water pipe III to form circulation; the throttle valve on the preset pipeline between the plate type heat exchanger and the heat pipe type waste heat recovery heat exchanger is closed, and the tap water b heated to the high temperature of 65℃ is heated2All the water flows into a second hot water storage tank through a water pipe IV;
q2, and normal temperature tap water b4Flows into a heat pipe type waste heat recovery heat exchanger through a water pipe VIII, and generates flue gas c with high temperature of 650 ℃ by a diesel engine1Flows into the heat pipe type waste heat recovery heat exchanger through the air pipe I, and then low-temperature flue gas c is generated after heat exchange2Discharging via air pipe II, closing throttle valve between heat pipe type waste heat recovery heat exchanger and lithium bromide refrigerating unit, and heating to 90 deg.C tap water b5All the water flows into a first hot water storage tank through a water pipe IX;
q3, high-temperature tap water b in second hot water tank2And high-temperature tap water b in the first hot water storage tank5Respectively mixed by branch pipes III and IV to form high-temperature tap water b6Then respectively flows into the radiator through water pipes VI and VII to be used as domestic hot water for heating.
Through the improvement of the system composition structure and the corresponding use mode, the refrigeration and heating functions of the system are more independent, multiple purposes are provided, the waste heat of cylinder sleeve water and smoke can be utilized to the maximum extent according to the actual environment, the utilization rate of the waste heat is indirectly improved, and the cost is saved.

Claims (6)

1. A system for carrying out combined cooling and heating supply by utilizing waste heat of a marine diesel engine is characterized by comprising a heating radiator, a heat exchanger I, a heat exchanger II, a lithium bromide refrigerating unit and a condenser which are sequentially connected by a preset pipeline, and further comprising a first hot water storage tank and a second hot water storage tank;
the heat exchanger I is additionally provided with water pipes I, II and III which are respectively used for tap water b1Inflow of cylinder liner water a1Inflow and liner water a2Flowing out; the heat exchanger I is connected with the second hot water storage tank through a water pipe IV;
the heat exchanger II is provided with air pipes I and II which are respectively used for flue gas c1Inflow and flue gas c2Flowing out;
air pipes III and IV are additionally arranged on the lithium bromide refrigerating unit and are respectively used for air d1Inflow and air d2Flowing out;
a water pipe V is additionally arranged on the condenser, a water pump is arranged on the water pipe V, the water pipe V is branched into a branch pipe I and a branch pipe II, the branch pipe I is connected with the heat exchanger II, and the branch pipe II is connected with the first hot water storage tank;
a branch pipe IV and a branch pipe III are respectively arranged on the first hot water storage tank and the second hot water storage tank, and a water pump is respectively arranged on the branch pipe III and the branch pipe IV; the branch pipes III and IV are merged and then branched to form a water pipe VI and a water pipe VII, the water pipe VI is connected with the heating radiator, and the water pipe VII is used for domestic hot water;
on the pipeline of predetermineeing between heat exchanger I and the heat exchanger II, and all be equipped with the choke valve on the pipeline of predetermineeing between heat exchanger II and the lithium bromide refrigerating unit, establish the choke valve on water pipe I, IV, VI, the VII branch, establish the choke valve on branch pipe I, II, III, IV branch.
2. The system for combined cooling and heating by using the waste heat of the marine diesel engine as claimed in claim 1, wherein a water pipe VIII is further arranged on the heat exchanger II, a water pipe IX is connected between the heat exchanger II and the first hot water storage tank, and throttle valves are respectively arranged on the water pipes VIII and IX.
3. The system for combined cooling and heating by using the waste heat of the marine diesel engine as claimed in claim 1 or 2, wherein the heat exchanger I is a plate heat exchanger, and the heat exchanger II is a heat pipe type waste heat recovery heat exchanger.
4. The use method of the system for combined cooling and heating by using the waste heat of the marine diesel engine as set forth in claim 1 is characterized by comprising the following steps in a normal mode:
s1 high-temperature cylinder liner water a in diesel engine1Normal temperature tap water b1Respectively enters the heat exchanger I through the water pipes I and II, and then the low-temperature cylinder liner water a is obtained after heat exchange2Flows back to the diesel engine through a water pipe III to form circulation; high-temperature tap water b2One part of the water flows into a heat exchanger II from a preset pipeline, and the other part of the water flows into a second hot water storage tank through a water pipe IV;
s2 high-temperature flue gas c generated by diesel engine1Flowing into heat exchanger II through air pipe I, exchanging heat, and flowing into high-temperature tap water b2Heated to high grade steam e1Low temperature flue gas c2High grade steam e discharged through the air pipe II1Entering a lithium bromide refrigerating unit through a preset pipeline;
s3, normal temperature air d1Flows into the lithium bromide refrigerating unit through an air pipe III and then is converted into low-temperature air d2High grade steam e flowing out through the air pipe IV1Water-vapor mixture e converted to low grade2And flows into a condenser through a preset pipeline;
s4 Low-grade water-vapor mixture e2Tap water b converted to high temperature in condenser3(ii) a High-temperature tap water b3Part of the water flows back into the heat exchanger II through the branch pipe I under the action of a water pump, and the rest flows into the first hot water storage tank through the branch pipe IIPerforming the following steps;
s5 tap water b of second hot water storage tank with part of high temperature2And tap water b of the first hot water storage tank with a part of high temperature3Respectively mixed by branch pipes III and IV to form high-temperature tap water b4Then respectively flows into the radiator through water pipes VI and VII to be used as domestic hot water for heating.
5. The use method of the system for combined cooling and heating by using the waste heat of the marine diesel engine as claimed in claim 1, is characterized in that when the weather is hot, the cooling mode is performed by adopting the following steps:
p1 high-temperature cylinder liner water a in diesel engine1Normal temperature tap water b1Respectively enters the heat exchanger I through the water pipes I and II, and then the low-temperature cylinder liner water a is obtained after heat exchange2Flows back to the diesel engine through a water pipe III to form circulation; closing the throttle valve on the water pipe IV and the high-temperature tap water b2All the water flows into a heat exchanger II from a preset pipeline;
p2 high-temperature flue gas c generated by diesel engine1Flows into a heat exchanger II through an air pipe I, and then high-temperature tap water b is obtained after heat exchange2Heated to high grade steam e1Low temperature flue gas c2High grade steam e discharged through the air pipe II1Entering a lithium bromide refrigerating unit through a preset pipeline;
p3, Normal temperature air d1Flows into the lithium bromide refrigerating unit through an air pipe III and then is converted into low-temperature air d2High grade steam e flowing out through the air pipe IV1Water-vapor mixture e converted to low grade2And flows into a condenser through a preset pipeline;
p4, low-grade water-steam mixture e2Tap water b converted to high temperature in condenser3(ii) a High-temperature tap water b3Most of the water flows back into the heat exchanger II through the branch pipe I under the action of a water pump, and the least of the water flows into the first hot water storage tank through the branch pipe II;
p5, closing throttle valve on branch pipe III and water pipe VI, and storing a small part of high-temperature tap water b in first hot water storage tank3Through branch pipe IV and water pipe VII as life heatAnd (6) water flows out.
6. The use method of the system for combined cooling and heating by using the waste heat of the marine diesel engine as claimed in claim 2, is characterized in that when the weather is cold, the heating mode is performed by adopting the following steps:
q1 high-temperature cylinder liner water a in diesel engine1Normal temperature tap water b1Respectively enters the heat exchanger I through the water pipes I and II, and then the low-temperature cylinder liner water a is obtained after heat exchange2Flows back to the diesel engine through a water pipe III to form circulation; closing a throttle valve on a preset pipeline between the heat exchanger I and the heat exchanger II and high-temperature tap water b2All the water flows into a second hot water storage tank through a water pipe IV;
q2, and normal temperature tap water b4Flows into a heat exchanger II through a water pipe VIII, and high-temperature flue gas c generated by the diesel engine1Flowing into heat exchanger II through air pipe I, exchanging heat, and collecting tap water b at normal temperature4Tap water b heated to high temperature5(ii) a Closing throttle valve between heat exchanger II and lithium bromide refrigerating unit, and high-temperature tap water b5All flows into the first hot water storage tank;
q3, high-temperature tap water b in second hot water tank2And high-temperature tap water b in the first hot water storage tank5Respectively mixed by branch pipes III and IV to form high-temperature tap water b6Then respectively flows into the radiator through water pipes VI and VII to be used as domestic hot water for heating.
CN201811012595.7A 2018-08-31 2018-08-31 System for performing combined cooling and heating supply by using waste heat of marine diesel engine and using method thereof Active CN109162784B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000304375A (en) * 1999-04-19 2000-11-02 Osaka Gas Co Ltd Latent heat recovery type absorption water cooler heater
CN201666196U (en) * 2010-04-22 2010-12-08 泰豪科技股份有限公司 Waste heat recovery device of diesel generator set
CN203584613U (en) * 2013-12-02 2014-05-07 大连普阳发电机组有限公司 Waste heat recovery energy-saving system for diesel generating set
EP2952723A1 (en) * 2014-06-05 2015-12-09 Samsung Heavy Ind. Co., Ltd. Waste heat recovery device for a marine vessel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000304375A (en) * 1999-04-19 2000-11-02 Osaka Gas Co Ltd Latent heat recovery type absorption water cooler heater
CN201666196U (en) * 2010-04-22 2010-12-08 泰豪科技股份有限公司 Waste heat recovery device of diesel generator set
CN203584613U (en) * 2013-12-02 2014-05-07 大连普阳发电机组有限公司 Waste heat recovery energy-saving system for diesel generating set
EP2952723A1 (en) * 2014-06-05 2015-12-09 Samsung Heavy Ind. Co., Ltd. Waste heat recovery device for a marine vessel

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