CN116124330A - Energy efficiency monitoring method of high-temperature fresh water cooling system of ship main engine - Google Patents
Energy efficiency monitoring method of high-temperature fresh water cooling system of ship main engine Download PDFInfo
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- CN116124330A CN116124330A CN202310020529.9A CN202310020529A CN116124330A CN 116124330 A CN116124330 A CN 116124330A CN 202310020529 A CN202310020529 A CN 202310020529A CN 116124330 A CN116124330 A CN 116124330A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
- G01K17/06—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device
- G01K17/08—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device based upon measurement of temperature difference or of a temperature
- G01K17/10—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device based upon measurement of temperature difference or of a temperature between an inlet and an outlet point, combined with measurement of rate of flow of the medium if such, by integration during a certain time-interval
- G01K17/12—Indicating product of flow and temperature difference directly or temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B79/00—Monitoring properties or operating parameters of vessels in operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
- B63H21/383—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like for handling cooling-water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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Abstract
The energy efficiency monitoring method for the high-temperature fresh water cooling system of the ship host comprises an energy efficiency assessment process, a fault monitoring process and a heat exchanger judging process, wherein each process is based on collected data of the host, the heat exchanger and the water pump, energy efficiency is calculated firstly, then the energy efficiency and corresponding working conditions are used as basic units of a historical database, when the energy efficiency and the corresponding working conditions are used, data in the historical database are screened according to the working condition data firstly, data required by the energy efficiency assessment process, the fault monitoring process and the heat exchanger judging process are selected, and then corresponding threshold judgment is carried out, so that energy efficiency assessment, fault existence, fault type, heat exchanger fault judgment and the like are realized. The design not only can monitor the energy efficiency of the high-temperature fresh water cooling system of the ship host, but also can reduce the energy consumption loss, and is convenient for daily maintenance.
Description
Technical Field
The invention relates to a monitoring technology of a ship system, belongs to the field of energy efficiency monitoring and evaluation, and particularly relates to an energy efficiency monitoring method of a high-temperature fresh water cooling system of a ship host.
Background
At present, a large amount of electric energy is consumed by the high-temperature fresh water cooling system of the ship main machine in the operation process, the energy efficiency of the high-temperature fresh water cooling system of the ship main machine directly influences the energy efficiency level of the ship, and in the operation process of the ship, the energy efficiency of the high-temperature fresh water cooling system of the ship main machine is possibly reduced due to factors such as the scaling of a cooling cavity of the ship main machine and a cooling channel of a heat exchanger, and therefore, the corresponding energy efficiency monitoring is required.
However, due to the lack of a monitoring method for the energy efficiency of the high-temperature fresh water cooling system of the ship host, effective energy efficiency data cannot be obtained, so that the change of the energy efficiency level of the high-temperature fresh water cooling system of the ship host after a period of operation cannot be judged, and therefore, a turbine operator cannot be guided to scientifically maintain the high-temperature fresh water cooling system of the ship host, so that the energy loss of the high-temperature fresh water cooling system of the ship host is reduced.
Therefore, an effective monitoring system and method for the high-temperature fresh water cooling system of the ship host computer are required to be designed to obtain effective monitoring data, and subsequent treatment processes such as energy efficiency assessment, host fault judgment, heat exchanger judgment and the like are carried out to monitor the energy efficiency level of the high-temperature fresh water cooling system of the ship host computer, quickly identify faults occurring in the system and scientifically design the cooling system according to the monitoring data.
The disclosure of this background section is only intended to increase the understanding of the general background of the present patent application and should not be taken as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to overcome the defect and the problem that the energy efficiency of a high-temperature fresh water cooling system of a ship host cannot be monitored in the prior art, and provides an energy efficiency monitoring method of the high-temperature fresh water cooling system of the ship host, which can monitor the energy efficiency of the high-temperature fresh water cooling system of the ship host.
In order to achieve the above object, the technical solution of the present invention is: the utility model provides an energy efficiency monitoring method of a ship host high-temperature fresh water cooling system, which comprises a ship host and a heat exchanger, wherein the ship host comprises a cylinder block hole and a cylinder sleeve arranged in the cylinder block hole;
the cooling water outlet of the ship main engine is communicated with the high-temperature water inlet of the heat exchanger through a high-temperature pipeline, the high-temperature water outlet of the heat exchanger is communicated with the cooling water inlet of the ship main engine through a low-temperature pipeline, and a first water pump is arranged on the low-temperature pipeline; the high-temperature water inlet on the heat exchanger is communicated with the high-temperature water outlet of the heat exchanger through a water return pipeline, and the low-temperature water outlet on the heat exchanger is communicated with the low-temperature water inlet on the heat exchanger after passing through a first heat exchange pipeline, an external cold source and a second heat exchange pipeline in sequence;
the energy efficiency monitoring method comprises an energy efficiency evaluation process, wherein the energy efficiency evaluation process comprises the following steps of:
101: collecting real-time operation data of a ship host and a heat exchanger, wherein the real-time operation data comprises the following steps: host rotation speed n, torque Me, power Ne, host smoke exhaust temperature T, real-time flow G of cylinder jacket cooling water, host inlet temperature T1 and host outlet temperature T2 corresponding to a cooling water inlet and a cooling water outlet on a ship host; a high-temperature water inlet, a high-temperature water outlet, a low-temperature water outlet and a high-temperature water outlet temperature T3, a high-temperature water outlet temperature T4, a low-temperature water outlet temperature T5 and a low-temperature water inlet temperature T6 of the heat exchanger corresponding to the low-temperature water inlet on the heat exchanger, and collecting the water return flow q of the heat exchanger on a water return pipeline; the input electric energy P1 of the first water pump;
102: calculating heat exchange quantity Q=c×G (T1-T2) of a ship main engine, wherein c is a known specific heat capacity value of cooling water in the cylinder sleeve; meanwhile, the input electric energy P1 is used as the input electric energy P of the whole cooling system; then, calculating the energy efficiency index eta of the high-temperature fresh water cooling system of the ship host, wherein the formula is as follows: η=q/P;
103: the energy efficiency index and the corresponding host working conditions are used as a set of historical data to be stored in a historical database, and the host working conditions comprise host rotating speed n, torque Me and power Ne; the historical data is continuously collected and continuously stored in a historical database;
104: when the energy efficiency condition is required to be evaluated subsequently, the energy efficiency index of the moment or stage to be evaluated and the corresponding host working condition are obtained according to the method, then the historical energy efficiency index corresponding to the working condition data interpolation with the same or similar working condition is searched in the historical database, if the historical energy efficiency index is more than or equal to two, an average value is taken, then the energy efficiency index of the moment or stage to be evaluated is compared with the historical energy efficiency index or the average value thereof, and when the absolute value of the difference exceeds an evaluation threshold, the energy efficiency of the cooling system is judged to be changed.
The low-temperature pipeline beside the cooling water inlet is provided with a host inlet temperature sensor, the high-temperature pipeline beside the cooling water outlet is provided with a host outlet temperature sensor and a host flowmeter, the high-temperature pipeline beside the high-temperature water inlet is provided with a high-temperature inlet temperature sensor, the low-temperature pipeline beside the high-temperature water outlet is provided with a high-temperature outlet temperature sensor, the water return pipeline is provided with a water return flowmeter, the second heat exchange pipeline beside the low-temperature water inlet is provided with a low-temperature inlet temperature sensor, and the first heat exchange pipeline beside the low-temperature water outlet is provided with a low-temperature outlet temperature sensor.
The energy efficiency index of the stage to be evaluated and the corresponding host working condition thereof refer to:
selecting the working condition data with the largest occurrence among the working condition data corresponding to the stage to be evaluated as the working condition of the host computer of the stage to be evaluated, screening out a plurality of corresponding energy efficiency indexes from the working condition data, and then obtaining an average value to be used as the energy efficiency index of the stage to be evaluated.
The energy efficiency monitoring method also comprises a fault monitoring process, wherein the fault monitoring process comprises the following steps of:
201: collecting the inlet temperature T1 of a host, the exhaust temperature T of the host and the corresponding working conditions of the host at the moment or stage to be monitored;
202: searching host inlet temperature and exhaust gas temperature corresponding to interpolation of working condition data with consistent or similar working conditions in a historical database, calculating an average value Taverage of the host inlet temperature and an average value Taverage of the host exhaust gas temperature, comparing the host inlet temperature T1 to be monitored with the Taverage value Taverage, judging that a ship host has no fault if the absolute value of the difference value is smaller than or equal to an inlet temperature threshold value, and ending monitoring; if the temperature is greater than the inlet temperature threshold, judging that the ship main engine fails, and carrying out the next step;
203: comparing the smoke discharging temperature t of the main engine to be monitored with the average t, and judging that the failure type is that the heat transfer performance of the ship main engine is problematic, such as scale, if the absolute value of the difference value is smaller than or equal to the smoke discharging temperature threshold value; if the temperature of the exhaust gas is greater than the threshold value of the exhaust gas temperature, judging that the fault type is that the combustion working condition of the ship host is problematic.
The host inlet temperature T1, the host exhaust temperature T and the corresponding host working conditions of the stage to be monitored are as follows: firstly, selecting the most working condition data from the working condition data corresponding to the stage to be monitored as the working condition of the host computer of the stage to be monitored, screening out a plurality of corresponding host computer inlet temperatures T1 and host computer exhaust temperatures T from the working condition data, and then respectively obtaining average values to be used as the host computer inlet temperatures T1 and the host computer exhaust temperatures T of the stage to be monitored.
The energy efficiency monitoring method also comprises a heat exchanger judging process, and the heat exchanger judging process comprises the following steps of:
301: collecting high-temperature inlet temperature T3, high-temperature outlet temperature T4, low-temperature inlet temperature T5, low-temperature outlet temperature T6, backwater flow q and corresponding host working conditions of the heat exchanger at the moment or stage to be judged;
302: firstly, calculating a temperature difference Thigh temperature difference= (T3-T4) of a high-temperature inlet and a high-temperature outlet of a heat exchanger, screening primary data which are the same as the Thigh temperature difference in historical data, screening secondary data which are the same as a temperature difference Tlow temperature difference= (T5-T6) of a low-temperature inlet and a low-temperature outlet of the heat exchanger from the screened primary data, screening corresponding backwater flow q from the secondary data, and then averaging to obtain backwater flow average qaverage;
303: firstly, comparing the average q and q of the backwater flow of the heat exchanger in the stage to be judged, if the absolute value of the difference value is smaller than or equal to the judging threshold value, judging that the heat exchanger has no fault, and if the absolute value of the difference value is larger than the judging threshold value, judging that the heat exchanger has fault.
The high temperature inlet temperature T3, the high temperature outlet temperature T4, the low temperature inlet temperature T5, the low temperature outlet temperature T6 and the backwater flow q of the heat exchanger in the stage to be judged, and the corresponding host working conditions are as follows: selecting the working condition data with the largest occurrence among working condition data corresponding to the stage to be judged as the working condition of a host computer of the stage to be judged, screening high-temperature inlet temperature, high-temperature outlet temperature, low-temperature inlet temperature, low-temperature outlet temperature and backwater flow of a plurality of corresponding heat exchangers from the working condition data, and respectively obtaining average values to be used as the high-temperature inlet temperature T3, the high-temperature outlet temperature T4, the low-temperature inlet temperature T5, the low-temperature outlet temperature T6 and the backwater flow q of the heat exchangers of the stage to be judged.
The temperature of the outlet temperature T2 of the host is 70-85 ℃.
The continuous collection time of the historical data and the continuous collection stored in the historical database is as follows: the ship sails within one month after leaving the factory.
The low-temperature pipeline is also provided with a second water pump connected with the first water pump in parallel, the input electric energy of the second water pump is P2, and at the moment, the sum of the input electric energy of the first water pump and the second water pump is used as the input electric energy P of the whole cooling system, wherein P=P1+P2.
Compared with the prior art, the invention has the beneficial effects that:
1. in the energy efficiency monitoring method of the high-temperature fresh water cooling system of the ship host, the heat exchange quantity Q of the ship host and the ratio of the input electric energy P of the whole cooling system are used as the energy efficiency index eta of the high-temperature fresh water cooling system of the ship host, so that the energy efficiency of the high-temperature fresh water cooling system of the ship host can be monitored, meanwhile, the energy efficiency value (comprising the operation data of the ship host, a heat exchanger, a water pump and the like which are collected simultaneously) and the corresponding host working condition are used as a set of historical data to be stored in a historical database, and the historical data are continuously collected and continuously input, so that the historical database is used as the basis for development of a subsequent process, including but not being limited by energy efficiency evaluation, host fault judgment, heat exchanger fault judgment and the like, and the running condition of the whole cooling system is monitored timely and comprehensively, so that the maintenance is facilitated, and the energy consumption loss is reduced. Therefore, the invention not only can monitor the energy efficiency of the high-temperature fresh water cooling system of the ship host, but also can reduce the energy consumption loss and is convenient for daily maintenance.
2. In the energy efficiency monitoring method of the high-temperature fresh water cooling system of the ship host, when the fault monitoring process of the ship host is carried out, not only can the fault be judged, but also the type of the fault can be judged, wherein when the fault is judged, the inlet temperature of the host is compared, and then the exhaust temperature of the host is compared, and the limiting reason is that: if the temperature of the host outlet is unchanged, the temperature of the host inlet is changed under the condition that the working condition is unchanged, the failure of the ship host can be directly judged, and then the combustion working condition in the host cylinder sleeve is further specifically judged to be changed through the exhaust gas temperature, and the heat transfer performance of the host is also changed. Therefore, the invention not only can judge the failure of the host, but also has higher accuracy and easy operation.
3. In the energy efficiency monitoring method of the high-temperature fresh water cooling system of the ship host, when judging the running condition of the heat exchanger, the invention not only can judge whether the heat exchanger fails, but also limits the judging sequence, namely, firstly compares the temperature difference between the high-temperature inlet and the high-temperature outlet of the heat exchanger, then compares the temperature difference between the low-temperature inlet and the low-temperature outlet of the heat exchanger, and then compares the backwater flow of the heat exchanger, and the limiting method has the advantages that: misleading caused by the low-temperature fresh water circulation of the heat exchanger or the failure of the seawater cooling side (an external cold source and a pipeline where the external cold source is positioned) can be avoided, otherwise, if the temperature difference between the low-temperature inlet and the low-temperature outlet of the heat exchanger is screened, the data screened for the first time are likely to be wrong, so that the final judging effect is reduced. Therefore, the invention has more accurate judging effect on the operation faults of the heat exchanger.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a flow chart of the energy efficiency evaluation process of the present invention.
Fig. 3 is a flow chart of the fault monitoring process of the present invention.
FIG. 4 is a flow chart of a heat exchanger judgment process in the present invention.
In the figure: the ship comprises a ship main engine 1, a cooling water outlet 11, a cooling water inlet 12, a high-temperature pipeline 13, a low-temperature pipeline 14, a main engine inlet temperature sensor 2, a main engine outlet temperature sensor 3, a main engine flowmeter 4, a heat exchanger 5, a high-temperature water inlet 51, a high-temperature water outlet 52, a low-temperature water outlet 53, a low-temperature water inlet 54, a water return pipeline 55, a first heat exchange pipeline 56, an external cold source 57, a second heat exchange pipeline 58, a high-temperature inlet temperature sensor 6, a high-temperature outlet temperature sensor 7, a low-temperature outlet temperature sensor 8, a low-temperature inlet temperature sensor 9, a water return flowmeter 10, a first water pump A and a second water pump B.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and detailed description.
Referring to fig. 1-4, an energy efficiency monitoring method of a high-temperature fresh water cooling system of a ship main engine, wherein the high-temperature fresh water cooling system of the ship main engine comprises a ship main engine 1 and a heat exchanger 5, and the ship main engine 1 comprises a cylinder block hole and a cylinder sleeve arranged in the cylinder block hole;
the cooling water outlet 11 on the ship main machine 1 is communicated with the high-temperature water inlet 51 of the heat exchanger 5 through a high-temperature pipeline 13, the high-temperature water outlet 52 of the heat exchanger 5 is communicated with the cooling water inlet 12 on the ship main machine 1 through a low-temperature pipeline 14, and a first water pump A is arranged on the low-temperature pipeline 14; the high-temperature water inlet 51 on the heat exchanger 5 is communicated with the high-temperature water outlet 52 of the heat exchanger 5 through a water return pipeline 55, and the low-temperature water outlet 53 on the heat exchanger 5 is communicated with the low-temperature water inlet 54 on the heat exchanger 5 after passing through a first heat exchange pipeline 56, an external cold source 57 and a second heat exchange pipeline 58 in sequence;
the energy efficiency monitoring method comprises an energy efficiency evaluation process, wherein the energy efficiency evaluation process comprises the following steps of:
101: collecting real-time operation data of the ship main engine 1 and the heat exchanger 5, wherein the real-time operation data comprises: host rotation speed n, torque Me, power Ne, host smoke exhaust temperature T, real-time flow G of cylinder jacket cooling water, host inlet temperature T1 and host outlet temperature T2 corresponding to a cooling water inlet 12 and a cooling water outlet 11 on a ship host 1; the high-temperature inlet temperature T3, the high-temperature outlet temperature T4, the low-temperature outlet temperature T5 and the low-temperature inlet temperature T6 of the heat exchanger 5 corresponding to the high-temperature water inlet 51, the high-temperature water outlet 52, the low-temperature water outlet 53 and the low-temperature water inlet 54 on the heat exchanger 5 are used for collecting the backwater flow q of the heat exchanger 5 on the backwater pipeline 55; the input electric energy P1 of the first water pump A;
102: calculating heat exchange quantity Q=c×G (T1-T2) of the marine main engine 1, wherein c is a known specific heat capacity value of cooling water in the cylinder liner; meanwhile, the input electric energy P1 is used as the input electric energy P of the whole cooling system; then, calculating the energy efficiency index eta of the high-temperature fresh water cooling system of the ship host, wherein the formula is as follows: η=q/P;
103: the energy efficiency index and the corresponding host working conditions are used as a set of historical data to be stored in a historical database, and the host working conditions comprise host rotating speed n, torque Me and power Ne; the historical data is continuously collected and continuously stored in a historical database;
104: when the energy efficiency condition is required to be evaluated subsequently, the energy efficiency index of the moment or stage to be evaluated and the corresponding host working condition are obtained according to the method, then the historical energy efficiency index corresponding to the working condition data interpolation with the same or similar working condition is searched in the historical database, if the historical energy efficiency index is more than or equal to two, an average value is taken, then the energy efficiency index of the moment or stage to be evaluated is compared with the historical energy efficiency index or the average value thereof, and when the absolute value of the difference exceeds an evaluation threshold, the energy efficiency of the cooling system is judged to be changed.
The low-temperature pipeline 14 beside the cooling water inlet 12 is provided with a host inlet temperature sensor 2, the high-temperature pipeline 13 beside the cooling water outlet 11 is provided with a host outlet temperature sensor 3 and a host flowmeter 4, the high-temperature pipeline 13 beside the high-temperature water inlet 51 is provided with a high-temperature inlet temperature sensor 6, the low-temperature pipeline 14 beside the high-temperature water outlet 52 is provided with a high-temperature outlet temperature sensor 7, the water return pipeline 55 is provided with a water return flowmeter 10, the second heat exchange pipeline 58 beside the low-temperature water inlet 54 is provided with a low-temperature inlet temperature sensor 9, and the first heat exchange pipeline 56 beside the low-temperature water outlet 53 is provided with a low-temperature outlet temperature sensor 8.
The energy efficiency index of the stage to be evaluated and the corresponding host working condition thereof refer to:
selecting the working condition data with the largest occurrence among the working condition data corresponding to the stage to be evaluated as the working condition of the host computer of the stage to be evaluated, screening out a plurality of corresponding energy efficiency indexes from the working condition data, and then obtaining an average value to be used as the energy efficiency index of the stage to be evaluated.
The energy efficiency monitoring method also comprises a fault monitoring process, wherein the fault monitoring process comprises the following steps of:
201: collecting the inlet temperature T1 of a host, the exhaust temperature T of the host and the corresponding working conditions of the host at the moment or stage to be monitored;
202: firstly, searching host inlet temperature and exhaust gas temperature corresponding to interpolation of working condition data with consistent or similar working conditions in a historical database, then calculating an average value Taverage of the host inlet temperature and an average value Taverage of the host exhaust gas temperature, then comparing the host inlet temperature T1 to be monitored with the Taverage value Taverage, judging that the ship host 1 has no fault if the absolute value of the difference value is smaller than or equal to an inlet temperature threshold value, and ending monitoring; if the temperature is greater than the inlet temperature threshold, judging that the ship main engine 1 fails, and carrying out the next step;
203: comparing the host smoke discharge temperature t to be monitored with the average t, and judging that the failure type is that the heat transfer performance of the ship host 1 is problematic, such as scale, if the absolute value of the difference is smaller than or equal to the smoke discharge temperature threshold; if the temperature of the exhaust gas is greater than the threshold value of the exhaust gas temperature, judging that the fault type is that the combustion working condition of the ship main engine 1 is problematic.
The host inlet temperature T1, the host exhaust temperature T and the corresponding host working conditions of the stage to be monitored are as follows: firstly, selecting the most working condition data from the working condition data corresponding to the stage to be monitored as the working condition of the host computer of the stage to be monitored, screening out a plurality of corresponding host computer inlet temperatures T1 and host computer exhaust temperatures T from the working condition data, and then respectively obtaining average values to be used as the host computer inlet temperatures T1 and the host computer exhaust temperatures T of the stage to be monitored.
The energy efficiency monitoring method also comprises a heat exchanger judging process, and the heat exchanger judging process comprises the following steps of:
301: collecting the high-temperature inlet temperature T3, the high-temperature outlet temperature T4, the low-temperature inlet temperature T5, the low-temperature outlet temperature T6, the backwater flow q and the corresponding host working conditions of the heat exchanger 5 at the moment or stage to be judged;
302: firstly, calculating a temperature difference Thigh temperature difference= (T3-T4) of a high-temperature inlet and outlet of the heat exchanger 5, screening primary data which are the same as the Thigh temperature difference in historical data, then screening secondary data which are the same as the temperature difference Tlow temperature difference= (T5-T6) of a low-temperature inlet and outlet of the heat exchanger 5 from the screened primary data, screening corresponding backwater flow q from the secondary data, and then averaging to obtain backwater flow average value qaverage;
303: firstly, the water return flow q and q of the heat exchanger 5 in the stage to be judged are compared averagely, if the absolute value of the difference value is smaller than or equal to the judging threshold value, the heat exchanger 5 is judged to be free of faults, and if the absolute value of the difference value is larger than the judging threshold value, the heat exchanger 5 is judged to be faulty.
The high temperature inlet temperature T3, the high temperature outlet temperature T4, the low temperature inlet temperature T5, the low temperature outlet temperature T6, the backwater flow q of the heat exchanger 5 in the stage to be judged, and the corresponding host working conditions are as follows: selecting the working condition data with the largest occurrence among the working condition data corresponding to the stage to be judged as the working condition of the host computer of the stage to be judged, screening the high-temperature inlet temperature, the high-temperature outlet temperature, the low-temperature inlet temperature, the low-temperature outlet temperature and the backwater flow of the corresponding heat exchangers 5, and respectively obtaining average values to be used as the high-temperature inlet temperature T3, the high-temperature outlet temperature T4, the low-temperature inlet temperature T5, the low-temperature outlet temperature T6 and the backwater flow q of the heat exchangers 5 of the stage to be judged.
The temperature of the outlet temperature T2 of the host is 70-85 ℃.
The continuous collection time of the historical data and the continuous collection stored in the historical database is as follows: the ship sails within one month after leaving the factory.
The low-temperature pipeline 14 is further provided with a second water pump B connected with the first water pump A in parallel, the input electric energy of the second water pump B is P2, and at the moment, the sum of the input electric energy of the first water pump A and the input electric energy of the second water pump B is used as the input electric energy P of the whole cooling system, wherein P=P1+P2.
The principle of the invention is explained as follows:
the cylinder sleeve is a part of a ship main engine 1 (mainly a diesel engine), is a cylindrical part, is arranged in a cylinder block hole of the ship main engine 1, is pressed and fixed by a cylinder cover, and is in reciprocating motion in an inner hole of the cylinder cover, and cooling water is arranged outside the cylinder cover for cooling.
The working condition data (including rotation speed, torque and power) of the main engine and the temperature of the exhaust smoke (waste gas) are measured by a measuring instrument arranged on the main engine 1 of the ship, and the measured data are continuously changed.
For the historical database, the default ship provided by the invention has no fault and works normally in the early delivery period (one month).
The working condition data interpolation in the invention refers to: similar data is found first, and then working condition data obtained by an interpolation method is utilized.
Example 1:
referring to fig. 1-2, an energy efficiency monitoring method of a high-temperature fresh water cooling system of a ship main engine, wherein the high-temperature fresh water cooling system of the ship main engine comprises a ship main engine 1 and a heat exchanger 5, and the ship main engine 1 comprises a cylinder block hole and a cylinder sleeve arranged in the cylinder block hole;
the cooling water outlet 11 on the ship main machine 1 is communicated with the high-temperature water inlet 51 of the heat exchanger 5 through a high-temperature pipeline 13, the high-temperature water outlet 52 of the heat exchanger 5 is communicated with the cooling water inlet 12 on the ship main machine 1 through a low-temperature pipeline 14, and a first water pump A is arranged on the low-temperature pipeline 14; the high-temperature water inlet 51 on the heat exchanger 5 is communicated with the high-temperature water outlet 52 of the heat exchanger 5 through a water return pipeline 55, and the low-temperature water outlet 53 on the heat exchanger 5 is communicated with the low-temperature water inlet 54 on the heat exchanger 5 after passing through a first heat exchange pipeline 56, an external cold source 57 and a second heat exchange pipeline 58 in sequence;
the energy efficiency monitoring method comprises an energy efficiency evaluation process, wherein the energy efficiency evaluation process comprises the following steps of:
101: collecting real-time operation data of the ship main engine 1 and the heat exchanger 5, wherein the real-time operation data comprises: host rotation speed n, torque Me, power Ne, host smoke exhaust temperature T, real-time flow G of cylinder jacket cooling water, host inlet temperature T1 and host outlet temperature T2 corresponding to a cooling water inlet 12 and a cooling water outlet 11 on a ship host 1; the high-temperature inlet temperature T3, the high-temperature outlet temperature T4, the low-temperature outlet temperature T5 and the low-temperature inlet temperature T6 of the heat exchanger 5 corresponding to the high-temperature water inlet 51, the high-temperature water outlet 52, the low-temperature water outlet 53 and the low-temperature water inlet 54 on the heat exchanger 5 are used for collecting the backwater flow q of the heat exchanger 5 on the backwater pipeline 55; the input electric energy P1 of the first water pump A;
102: calculating heat exchange quantity Q=c×G (T1-T2) of the marine main engine 1, wherein c is a known specific heat capacity value of cooling water in the cylinder liner; meanwhile, the input electric energy P1 is used as the input electric energy P of the whole cooling system; then, calculating the energy efficiency index eta of the high-temperature fresh water cooling system of the ship host, wherein the formula is as follows: η=q/P;
103: the energy efficiency index and the corresponding host working conditions are used as a set of historical data to be stored in a historical database, and the host working conditions comprise host rotating speed n, torque Me and power Ne; the historical data is continuously collected and continuously stored in a historical database;
104: when the energy efficiency condition is required to be evaluated subsequently, the energy efficiency index of the moment or stage to be evaluated and the corresponding host working condition are obtained according to the method, then the historical energy efficiency index corresponding to the working condition data interpolation with the same or similar working condition is searched in the historical database, if the historical energy efficiency index is more than or equal to two, an average value is taken, then the energy efficiency index of the moment or stage to be evaluated is compared with the historical energy efficiency index or the average value thereof, and when the absolute value of the difference exceeds an evaluation threshold, the energy efficiency of the cooling system is judged to be changed. The evaluation threshold is preferably 1% to 3%, more preferably 2%.
Example 2:
the basic content is the same as in example 1, except that:
referring to fig. 3, the energy efficiency monitoring method further includes a fault monitoring process including the steps of:
201: collecting the inlet temperature T1 of a host, the exhaust temperature T of the host and the corresponding working conditions of the host at the moment or stage to be monitored;
202: firstly, searching host inlet temperature and exhaust gas temperature corresponding to interpolation of working condition data with consistent or similar working conditions in a historical database, then calculating an average value Taverage of the host inlet temperature and an average value Taverage of the host exhaust gas temperature, then comparing the host inlet temperature T1 to be monitored with the Taverage value Taverage, judging that the ship host 1 has no fault if the absolute value of the difference value is smaller than or equal to an inlet temperature threshold value, and ending monitoring; if the temperature is greater than the inlet temperature threshold, judging that the ship main engine 1 fails, and carrying out the next step;
203: comparing the host smoke discharge temperature t to be monitored with the average t, and judging that the failure type is that the heat transfer performance of the ship host 1 is problematic, such as scale, if the absolute value of the difference is smaller than or equal to the smoke discharge temperature threshold; if the temperature of the exhaust gas is greater than the threshold value of the exhaust gas temperature, judging that the fault type is that the combustion working condition of the ship main engine 1 is problematic. The smoke discharging temperature threshold value is 1-3 ℃.
Example 3:
the basic content is the same as in example 1, except that:
referring to fig. 4, the energy efficiency monitoring method further includes a heat exchanger judging process, which includes the following steps:
301: collecting the high-temperature inlet temperature T3, the high-temperature outlet temperature T4, the low-temperature inlet temperature T5, the low-temperature outlet temperature T6, the backwater flow q and the corresponding host working conditions of the heat exchanger 5 at the moment or stage to be judged;
302: firstly, calculating a temperature difference Thigh temperature difference= (T3-T4) of a high-temperature inlet and outlet of the heat exchanger 5, screening primary data which are the same as the Thigh temperature difference in historical data, then screening secondary data which are the same as the temperature difference Tlow temperature difference= (T5-T6) of a low-temperature inlet and outlet of the heat exchanger 5 from the screened primary data, screening corresponding backwater flow q from the secondary data, and then averaging to obtain backwater flow average value qaverage;
303: firstly, the water return flow q and q of the heat exchanger 5 in the stage to be judged are compared averagely, if the absolute value of the difference value is smaller than or equal to the judging threshold value, the heat exchanger 5 is judged to be free of faults, and if the absolute value of the difference value is larger than the judging threshold value, the heat exchanger 5 is judged to be faulty. The judgment threshold value is preferably 8% to 15%, more preferably 10%.
The above description is merely of preferred embodiments of the present invention, and the scope of the present invention is not limited to the above embodiments, but all equivalent modifications or variations according to the present disclosure will be within the scope of the claims.
Claims (10)
1. The utility model provides an energy efficiency monitoring method of boats and ships host computer high temperature fresh water cooling system, boats and ships host computer high temperature fresh water cooling system includes boats and ships host computer (1) and heat exchanger (5), boats and ships host computer (1) include cylinder block hole and the cylinder liner that sets up in it, its characterized in that:
the cooling water outlet (11) on the ship main machine (1) is communicated with the high-temperature water inlet (51) of the heat exchanger (5) through a high-temperature pipeline (13), the high-temperature water outlet (52) of the heat exchanger (5) is communicated with the cooling water inlet (12) on the ship main machine (1) through a low-temperature pipeline (14), and a first water pump (A) is arranged on the low-temperature pipeline (14); the high-temperature water inlet (51) on the heat exchanger (5) is communicated with the high-temperature water outlet (52) of the heat exchanger (5) through a water return pipeline (55), and the low-temperature water outlet (53) on the heat exchanger (5) is communicated with the low-temperature water inlet (54) on the heat exchanger (5) after passing through a first heat exchange pipeline (56), an external cold source (57) and a second heat exchange pipeline (58) in sequence;
the energy efficiency monitoring method comprises an energy efficiency evaluation process, wherein the energy efficiency evaluation process comprises the following steps of:
101: collecting real-time operation data of a ship host (1) and a heat exchanger (5), wherein the real-time operation data comprises: host rotation speed n, torque Me, power Ne, host smoke exhaust temperature T, real-time flow G of cylinder jacket cooling water, host inlet temperature T1 and host outlet temperature T2 corresponding to a cooling water inlet (12) and a cooling water outlet (11) on a ship host (1); the heat exchanger (5) is provided with a high-temperature inlet temperature T3, a high-temperature outlet temperature T4, a low-temperature outlet temperature T5 and a low-temperature inlet temperature T6 which correspond to a high-temperature water inlet (51), a high-temperature water outlet (52), a low-temperature water outlet (53) and a low-temperature water inlet (54) on the heat exchanger (5), and the backwater flow q of the heat exchanger (5) on a backwater pipeline (55) is collected; the input electric energy P1 of the first water pump (A);
102: calculating heat exchange quantity Q=c G (T1-T2) of the marine main engine (1), wherein c is a known specific heat capacity value of cooling water in the cylinder liner; meanwhile, the input electric energy P1 is used as the input electric energy P of the whole cooling system; then, calculating the energy efficiency index eta of the high-temperature fresh water cooling system of the ship host, wherein the formula is as follows: η=q/P;
103: the energy efficiency index and the corresponding host working conditions are used as a set of historical data to be stored in a historical database, and the host working conditions comprise host rotating speed n, torque Me and power Ne; the historical data is continuously collected and continuously stored in a historical database;
104: when the energy efficiency condition is required to be evaluated subsequently, the energy efficiency index of the moment or stage to be evaluated and the corresponding host working condition are obtained according to the method, then the historical energy efficiency index corresponding to the working condition data interpolation with the same or similar working condition is searched in the historical database, if the historical energy efficiency index is more than or equal to two, an average value is taken, then the energy efficiency index of the moment or stage to be evaluated is compared with the historical energy efficiency index or the average value thereof, and when the absolute value of the difference exceeds an evaluation threshold, the energy efficiency of the cooling system is judged to be changed.
2. The energy efficiency monitoring method of the marine main engine high-temperature fresh water cooling system according to claim 1, wherein the energy efficiency monitoring method comprises the following steps of: the low-temperature pipeline (14) beside the cooling water inlet (12) is provided with a host inlet temperature sensor (2), the high-temperature pipeline (13) beside the cooling water outlet (11) is provided with a host outlet temperature sensor (3) and a host flowmeter (4), the high-temperature pipeline (13) beside the high-temperature water inlet (51) is provided with a high-temperature inlet temperature sensor (6), the low-temperature pipeline (14) beside the high-temperature water outlet (52) is provided with a high-temperature outlet temperature sensor (7), the water return pipeline (55) is provided with a water return flowmeter (10), the second heat exchange pipeline (58) beside the low-temperature water inlet (54) is provided with a low-temperature inlet temperature sensor (9), and the first heat exchange pipeline (56) beside the low-temperature water outlet (53) is provided with a low-temperature outlet temperature sensor (8).
3. The energy efficiency monitoring method of the marine main engine high-temperature fresh water cooling system according to claim 1 or 2, wherein the energy efficiency monitoring method comprises the following steps of: the energy efficiency index of the stage to be evaluated and the corresponding host working condition thereof refer to:
selecting the working condition data with the largest occurrence among the working condition data corresponding to the stage to be evaluated as the working condition of the host computer of the stage to be evaluated, screening out a plurality of corresponding energy efficiency indexes from the working condition data, and then obtaining an average value to be used as the energy efficiency index of the stage to be evaluated.
4. The energy efficiency monitoring method of the marine main engine high-temperature fresh water cooling system according to claim 1 or 2, wherein the energy efficiency monitoring method comprises the following steps of: the energy efficiency monitoring method also comprises a fault monitoring process, wherein the fault monitoring process comprises the following steps of:
201: collecting the inlet temperature T1 of a host, the exhaust temperature T of the host and the corresponding working conditions of the host at the moment or stage to be monitored;
202: firstly, searching host inlet temperature and exhaust gas temperature corresponding to interpolation of working condition data with consistent or similar working conditions in a historical database, then calculating an average value Taverage of the host inlet temperature and an average value Taverage of the host exhaust gas temperature, then comparing the host inlet temperature T1 to be monitored with the Taverage value Taverage, and judging that the ship host (1) has no fault if the absolute value of the difference value is smaller than or equal to an inlet temperature threshold value, and ending the monitoring; if the temperature is greater than the inlet temperature threshold, judging that the ship main engine (1) fails, and carrying out the next step;
203: comparing the host smoke discharge temperature t to be monitored with the average t, and judging that the failure type is that the heat transfer performance of the ship host (1) is problematic, such as scale, if the absolute value of the difference value is smaller than or equal to the smoke discharge temperature threshold value; if the temperature of the exhaust gas is larger than the threshold value of the exhaust gas temperature, judging that the fault type is that the combustion working condition of the ship main engine (1) is problematic.
5. The energy efficiency monitoring method of the marine main engine high-temperature fresh water cooling system according to claim 4, wherein the energy efficiency monitoring method comprises the following steps of: the host inlet temperature T1, the host exhaust temperature T and the corresponding host working conditions of the stage to be monitored are as follows: firstly, selecting the most working condition data from the working condition data corresponding to the stage to be monitored as the working condition of the host computer of the stage to be monitored, screening out a plurality of corresponding host computer inlet temperatures T1 and host computer exhaust temperatures T from the working condition data, and then respectively obtaining average values to be used as the host computer inlet temperatures T1 and the host computer exhaust temperatures T of the stage to be monitored.
6. The energy efficiency monitoring method of the marine main engine high-temperature fresh water cooling system according to claim 1 or 2, wherein the energy efficiency monitoring method comprises the following steps of: the energy efficiency monitoring method also comprises a heat exchanger judging process, and the heat exchanger judging process comprises the following steps of:
301: collecting high-temperature inlet temperature T3, high-temperature outlet temperature T4, low-temperature inlet temperature T5, low-temperature outlet temperature T6, backwater flow q and corresponding host working conditions of the heat exchanger (5) at the moment or stage to be judged;
302: firstly, calculating a temperature difference T high temperature difference= (T3-T4) of a high temperature inlet and a temperature difference T high temperature difference of a high temperature outlet of a heat exchanger (5), screening primary data which are the same as the T high temperature difference in historical data, screening secondary data which are the same as the temperature difference T low temperature difference= (T5-T6) of a low temperature inlet and a low temperature outlet of the heat exchanger (5) from the screened primary data, screening corresponding backwater flow q from the secondary data, and then averaging to obtain backwater flow average value qaverage;
303: firstly, comparing the water return flow q and q average of the heat exchanger (5) in the stage to be judged, if the absolute value of the difference value is smaller than or equal to the judging threshold value, judging that the heat exchanger (5) has no fault, and if the absolute value of the difference value is larger than the judging threshold value, judging that the heat exchanger (5) has fault.
7. The energy efficiency monitoring method of the marine main engine high-temperature fresh water cooling system according to claim 6, wherein the energy efficiency monitoring method comprises the following steps of: the high temperature inlet temperature T3, the high temperature outlet temperature T4, the low temperature inlet temperature T5, the low temperature outlet temperature T6 and the backwater flow q of the heat exchanger (5) in the stage to be judged, and the corresponding host working conditions are as follows: selecting the working condition data with the largest occurrence among working condition data corresponding to the stage to be judged as the working condition of a host computer of the stage to be judged, screening high-temperature inlet temperature, high-temperature outlet temperature, low-temperature inlet temperature, low-temperature outlet temperature and backwater flow of a plurality of corresponding heat exchangers (5) from the working condition data, and respectively obtaining average values to be used as the high-temperature inlet temperature T3, the high-temperature outlet temperature T4, the low-temperature inlet temperature T5, the low-temperature outlet temperature T6 and the backwater flow q of the heat exchangers (5) of the stage to be judged.
8. The energy efficiency monitoring method of the marine main engine high-temperature fresh water cooling system according to claim 1 or 2, wherein the energy efficiency monitoring method comprises the following steps of: the temperature of the outlet temperature T2 of the host is 70-85 ℃.
9. The energy efficiency monitoring method of the marine main engine high-temperature fresh water cooling system according to claim 1 or 2, wherein the energy efficiency monitoring method comprises the following steps of: the continuous collection time of the historical data and the continuous collection stored in the historical database is as follows: the ship sails within one month after leaving the factory.
10. The energy efficiency monitoring method of the marine main engine high-temperature fresh water cooling system according to claim 1 or 2, wherein the energy efficiency monitoring method comprises the following steps of: the low-temperature pipeline (14) is also provided with a second water pump (B) connected with the first water pump (A) in parallel, the input electric energy of the second water pump (B) is P2, and at the moment, the sum of the input electric energy of the first water pump (A) and the input electric energy of the second water pump (B) is used as the input electric energy P of the whole cooling system, wherein P=P1+P2.
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