Online evaluation method for health degree of fuel oil atomization heater of steam type marine main engine

Abstract

The invention provides an online evaluation method for the health degree of a fuel oil atomization heater of a steam type marine main engine, and a matched monitoring platform is built. According to the method, through various sensors arranged on a monitoring platform, the flow Fo, the temperature Toi and the pressure Poi in a pipeline before fuel oil enters an atomization heater, the temperature Too and the pressure Poo in a fuel oil pipeline behind the heater, and the flow Fs, the temperature Tsi and the pressure Psi in a pipeline before steam enters the atomization heater are monitored online in real time; parameters such as temperature Tso and pressure Pso in a steam pipeline behind the heater are sent to an upper computer, an overheating characteristic parameter lambdao, a heat absorption characteristic parameter lambdaa and a heat release characteristic parameter lambdar are calculated respectively, then a health degree factor xi of the main engine fuel oil atomization heater is calculated, and according to the value range of the health degree factor, the health degree factor xi of the main engine fuel oil atomization heater is calculated. And segmented display and early warning of the health degree of the main engine fuel oil atomization heater are carried out on the upper computer, so that clear equipment operation state reference is provided for ship equipment management personnel.

Description

Technical Field

[0001] The invention belongs to the technical field of ship equipment evaluation and management, and in particular relates to an online health evaluation method for a steam-type ship main engine fuel atomizing heater. Background Art

[0002] In order to improve the reliability of the main power unit and reduce operating costs, modern civilian merchant ships mostly use low-speed two-stroke diesel engines as the main engine and burn heavy oil. Heavy oil is also called residual fuel oil (referred to as fuel oil). It has a very high viscosity at room temperature. At 15°C, its kinematic viscosity can reach hundreds of cSt. It is difficult to flow in the pipeline, and it cannot directly enter the main engine for spray atomization and combustion (the optimal viscosity of ship main engine fuel injection is generally 12-15cSt). Therefore, before entering the main engine high-pressure oil pump and injector, heavy oil must first pass through the main engine fuel atomization heater. By heating, its viscosity is reduced, fluidity is increased, and the atomization effect is ensured to be optimal. Therefore, the atomization heater is one of the core equipment to ensure the efficient, environmentally friendly and stable operation of the ship power system. It solves the problems of heavy oil viscosity and difficulty in atomization, and is an indispensable and important equipment for modern ship power systems.

[0003] Considering the heating efficiency, economy, safety and explosion prevention, the heat source of the main engine fuel atomizing heater is mostly steam. Long-term continuous operation and lack of maintenance will cause dirt to form in the steam heating tube, affecting the heat exchange effect, resulting in reduced heating efficiency and energy waste; the oil cavity on the other side of the steam heating tube wall will also form scaling and carbon deposition on the heating surface due to high temperature or overheating, resulting in the obstruction of heavy oil heating or carbon deposition, scaling and other peeling and clogging filters, causing fuel flow interruption. The performance degradation of the main engine fuel atomizing heater is gradual and not easy to attract the attention of ship equipment management personnel. In addition, the currently commonly used ship engine room monitoring and alarm systems do not have a separate alarm channel for the atomizing heater. Once the atomizing heater has a heat exchange failure or pipeline blockage, it will cause the main engine to shut down and the ship to lose control ability. Serious consequences, therefore, it is urgent to develop an online health evaluation method for steam-type ship main engine fuel atomizing heater.

[0004] Traditional performance monitoring of atomizing heaters mainly relies on regular inspections and manual disassembly, which is not only labor-intensive but also limited by personnel experience and subjective judgment, making it difficult to meet the needs of modern ships for efficient and intelligent equipment management. In addition, existing evaluation methods lack the ability to quantitatively analyze the thermal efficiency and operating stability of heaters, and the correlation between key parameters and heater health is insufficient, resulting in inefficient equipment management and maintenance.

[0005] By introducing online data collection and real-time health evaluation algorithms, the present invention can more comprehensively monitor the operating status of the steam fuel atomizing heater, effectively identify potential faults of the equipment and give prompt information in a timely manner. It can not only significantly improve the operating reliability of the atomizing heater and reduce the incidence of sudden failures, but also optimize the repair and maintenance cycle of the equipment and reduce operating costs. In addition, this method is of great significance for promoting the intelligent management of ship equipment. Through scientific evaluation of the health status of the equipment, the efficient operation of the ship's power system can be better guaranteed, thereby further improving the economy and reliability of the ship. Summary of the invention

[0006] The purpose of the present invention is to provide an online health evaluation method for a fuel atomizing heater of a steam-type ship main engine.

[0007] The technical solution adopted by the present invention is:

[0008] An online monitoring platform for the health of a steam-type ship main engine fuel atomizing heater is constructed, and the monitoring platform includes: a host computer 1, a fuel side multi-channel data collector 2, a steam side multi-channel data collector 3, a fuel inlet flow meter 4, a fuel inlet temperature sensor 5, a fuel inlet pressure sensor 6, a manual stop valve 7, a manual stop valve 8, a manual stop valve 9, a fuel outlet temperature sensor 10, a fuel outlet pressure sensor 11, a steam inlet pressure sensor 12, a steam inlet temperature sensor 13, a steam inlet flow meter 14, a steam outlet temperature sensor 15, and a steam outlet pressure sensor 16;

[0009] The manual stop valve 8 controls the bypass of the fuel pipeline and remains closed when the fuel atomizing heater is working normally. The manual stop valve 7 and the manual stop valve 9 respectively control the fuel inlet and outlet and remain open when the atomizing heater is working normally.

[0010] The fuel inlet flow meter 4 detects the fuel flow rate F flowing through the atomizing heater. o The fuel inlet temperature sensor 5 detects the fuel temperature T flowing into the atomizing heater. oi The fuel inlet pressure sensor 6 detects the fuel pressure P flowing into the atomizing heater. oi The fuel outlet temperature sensor 10 detects the fuel temperature T flowing out of the atomizing heater. oo The fuel outlet pressure sensor 11 detects the fuel pressure P flowing out of the atomizing heater. oo The fuel side multi-channel data collector 2 converts the fuel flow F o , fuel inlet temperature T oi , fuel inlet pressure P oi , fuel outlet temperature T oo , fuel outlet pressure P ooAfter being converted into digital signals, they are sent to the host computer 1;

[0011] The steam inlet flow meter 14 detects the steam flow rate F flowing through the atomizing heater. s The steam inlet temperature sensor 13 detects the steam temperature T flowing into the atomizing heater. si The steam inlet pressure sensor 12 detects the steam pressure P flowing into the atomizing heater. si The steam outlet temperature sensor 15 detects the steam temperature T flowing out of the atomizing heater. so The steam outlet pressure sensor 16 detects the steam pressure P flowing out of the atomizing heater. so The steam side multi-channel data collector 3 collects the steam flow F s , Steam inlet temperature T si , Steam inlet pressure P si , Steam outlet temperature T so , Steam outlet pressure P so After being converted into digital signals, they are sent to the host computer 1;

[0012] In the host computer 1, according to T si and P si Calculate the steam inlet enthalpy H by looking up the table i , according to T so and P so Calculate the steam outlet enthalpy H by looking up the table o ;

[0013] The health assessment of the fuel atomizing heater of the ship main engine using the above-mentioned online monitoring platform includes the following steps:

[0014] Step 1: Calculate the superheat characteristic parameter λ o

[0015] Overheat characteristic parameter λ that characterizes the degree of fuel overheating o It can be calculated by the following formula (1):

[0016]

[0017] The variable t is the cumulative working time of the fuel atomizing heater;

[0018] Step 2: Calculate the endothermic characteristic parameter λ a

[0019] Heat absorption characteristic parameter λ that characterizes the fuel heat absorption condition a It can be calculated by the following formula (2):

[0020]

[0021] Step 3: Calculate the heat release characteristic parameter λr

[0022] Heat release characteristic parameter λ that characterizes steam heat release conditions r It can be calculated by the following formula (3):

[0023] λ r =∫0 t F s (H i -H o )dt (3)

[0024] Step 4: Calculate the mist heater health factor ξ

[0025] The health factor ξ that characterizes the working performance of the atomizing heater can be calculated by the following formula (4):

[0026]

[0027] Step 5: Evaluate the health of the main engine fuel atomization heater according to the value range of ξ

[0028] When ξ∈(0.7,1], it indicates that the main engine fuel atomizing heater is working normally and no manual intervention is required. The health background in the upper computer monitoring software interface is displayed as green; when ξ∈(0.4,0.7], it indicates that the working state of the main engine fuel atomizing heater begins to deteriorate, and the heat exchange efficiency and flow performance are reduced. The health background in the upper computer monitoring software interface is displayed as yellow for early warning, and maintenance should be arranged in time; when ξ∈(0,0.4], it indicates that the working state of the main engine fuel atomizing heater is seriously deteriorated, and the heat exchange efficiency and flow performance are significantly reduced. The health background in the upper computer monitoring software interface is displayed as red and a general cabin alarm is issued. The standby or emergency heater should be switched immediately and maintenance should be arranged; it should be noted that after the maintenance is completed, the accumulated working time variable t of the atomizing heater should be reset (restored to 0);

[0029] The beneficial effects of the present invention are:

[0030] (1) By introducing the health factor, the heat transfer performance, flow characteristics and thermal efficiency of the atomizing heater can be comprehensively evaluated, the operating status of the equipment can be accurately identified, and a scientific basis can be provided for equipment maintenance and management;

[0031] (2) The present invention uses a real-time monitoring platform and a multi-parameter sensing system to build a dynamic online evaluation system, realize the segmented display and early warning function of the health status of the atomizing heater, improve the transparency of the equipment operation status, help to timely discover potential problems and optimize maintenance strategies, thereby reducing the risk of equipment failure and extending the service life;

[0032] (3) The health assessment method of the present invention is applicable to different operating conditions of steam fuel atomizing heaters, has good applicability and expansibility, and provides effective support for the intelligent monitoring of modern ship equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention relates to a schematic diagram of an online health evaluation system for a steam-type ship main engine fuel atomizing heater; DETAILED DESCRIPTION

[0034] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0035] First, if Figure 1 As shown, an online monitoring platform for the health of a steam-type ship main engine fuel atomizing heater is constructed, and the monitoring platform includes: a host computer 1, a fuel side multi-channel data collector 2, a steam side multi-channel data collector 3, a fuel inlet flow meter 4, a fuel inlet temperature sensor 5, a fuel inlet pressure sensor 6, a manual stop valve 7, a manual stop valve 8, a manual stop valve 9, a fuel outlet temperature sensor 10, a fuel outlet pressure sensor 11, a steam inlet pressure sensor 12, a steam inlet temperature sensor 13, a steam inlet flow meter 14, a steam outlet temperature sensor 15, and a steam outlet pressure sensor 16;

[0036] The manual stop valve 8 controls the bypass of the fuel pipeline and remains closed when the fuel atomizing heater works normally. The manual stop valve 7 and the manual stop valve 9 respectively control the fuel inlet and outlet and remain open when the atomizing heater works normally.

[0037] The fuel inlet flow meter 4 detects the fuel flow rate F flowing through the atomizing heater. o The fuel inlet temperature sensor 5 detects the fuel temperature T flowing into the atomizing heater. oi The fuel inlet pressure sensor 6 detects the fuel pressure P flowing into the atomizing heater. oi The fuel outlet temperature sensor 10 detects the fuel temperature T flowing out of the atomizing heater. oo The fuel outlet pressure sensor 11 detects the fuel pressure P flowing out of the atomizing heater. oo The fuel side multi-channel data collector 2 converts the fuel flow F o , fuel inlet temperature T oi , fuel inlet pressure P oi , fuel outlet temperature T oo , fuel outlet pressure P oo After being converted into digital signals, they are sent to the host computer 1;

[0038] The steam inlet flow meter 14 detects the steam flow rate F flowing through the atomizing heater.s The steam inlet temperature sensor 13 detects the steam temperature T flowing into the atomizing heater. si The steam inlet pressure sensor 12 detects the steam pressure P flowing into the atomizing heater. si The steam outlet temperature sensor 15 detects the steam temperature T flowing out of the atomizing heater. so The steam outlet pressure sensor 16 detects the steam pressure P flowing out of the atomizing heater. so The steam side multi-channel data collector 3 collects the steam flow F s , Steam inlet temperature T si , Steam inlet pressure P si , Steam outlet temperature T so , Steam outlet pressure P so After being converted into digital signals, they are sent to the host computer 1;

[0039] In the host computer 1, according to T si and P si Calculate the steam inlet enthalpy H by looking up the table i , according to T so and P so Calculate the steam outlet enthalpy H by looking up the table o ;

[0040] Then, using the above online monitoring platform to evaluate the health of the fuel atomizing heater of the ship main engine includes the following steps:

[0041] Step 1: Calculate the superheat characteristic parameter λ o

[0042] Overheat characteristic parameter λ that characterizes the degree of fuel overheating o It can be calculated by the following formula (1):

[0043]

[0044] The variable t is the cumulative working time of the fuel atomizing heater;

[0045] Step 2: Calculate the endothermic characteristic parameter λ a

[0046] Heat absorption characteristic parameter λ that characterizes the fuel heat absorption condition a It can be calculated by the following formula (2):

[0047]

[0048] Step 3: Calculate the heat release characteristic parameter λ r

[0049] Heat release characteristic parameter λ that characterizes steam heat release conditions rIt can be calculated by the following formula (3):

[0050] λ r =∫0 t F s (H i -H o )dt (3)

[0051] Step 4: Calculate the mist heater health factor ξ

[0052] The health factor ξ that characterizes the working performance of the atomizing heater can be calculated by the following formula (4):

[0053]

[0054] Step 5: Evaluate the health of the main engine fuel atomization heater according to the value range of ξ

[0055] When ξ∈(0.7,1], it indicates that the main engine fuel atomizing heater is working normally and no manual intervention is required. The health background in the upper computer monitoring software interface is displayed as green; when ξ∈(0.4,0.7], it indicates that the working state of the main engine fuel atomizing heater begins to deteriorate, and the heat exchange efficiency and flow performance are reduced. The health background in the upper computer monitoring software interface is displayed as yellow for early warning, and maintenance should be arranged in time; when ξ∈(0,0.4], it indicates that the working state of the main engine fuel atomizing heater is seriously deteriorated, and the heat exchange efficiency and flow performance are significantly reduced. The health background in the upper computer monitoring software interface is displayed as red and a general cabin alarm is issued. The standby or emergency heater should be switched immediately and maintenance should be arranged; it should be noted that after the maintenance is completed, the accumulated working time variable t of the atomizing heater should be reset (restored to 0).

Claims

1. An online evaluation method for the health of a steam-type ship main engine fuel atomizing heater, characterized in that: An online monitoring platform for the health of a steam-type ship main engine fuel atomizing heater is constructed, and the monitoring platform includes: a host computer 1, a fuel side multi-channel data collector 2, a steam side multi-channel data collector 3, a fuel inlet flow meter 4, a fuel inlet temperature sensor 5, a fuel inlet pressure sensor 6, a manual stop valve 7, a manual stop valve 8, a manual stop valve 9, a fuel outlet temperature sensor 10, a fuel outlet pressure sensor 11, a steam inlet pressure sensor 12, a steam inlet temperature sensor 13, a steam inlet flow meter 14, a steam outlet temperature sensor 15, and a steam outlet pressure sensor 16; The manual stop valve 8 controls the bypass of the fuel pipeline and remains closed when the fuel atomizing heater is working normally. The manual stop valve 7 and the manual stop valve 9 respectively control the fuel inlet and outlet and remain open when the atomizing heater is working normally. The fuel inlet flow meter 4 detects the fuel flow rate F flowing through the atomizing heater. o The fuel inlet temperature sensor 5 detects the fuel temperature T flowing into the atomizing heater. oi The fuel inlet pressure sensor 6 detects the fuel pressure P flowing into the atomizing heater. oi The fuel outlet temperature sensor 10 detects the fuel temperature T flowing out of the atomizing heater. oo The fuel outlet pressure sensor 11 detects the fuel pressure P flowing out of the atomizing heater. oo The fuel side multi-channel data collector 2 converts the fuel flow F o , fuel inlet temperature T oi , fuel inlet pressure P oi , fuel outlet temperature T oo , fuel outlet pressure P oo After being converted into digital signals, they are sent to the host computer 1; The steam inlet flow meter 14 detects the steam flow rate F flowing through the atomizing heater. s The steam inlet temperature sensor 13 detects the steam temperature T flowing into the atomizing heater. si The steam inlet pressure sensor 12 detects the steam pressure P flowing into the atomizing heater. si The steam outlet temperature sensor 15 detects the steam temperature T flowing out of the atomizing heater. so The steam outlet pressure sensor 16 detects the steam pressure P flowing out of the atomizing heater. so The steam side multi-channel data collector 3 collects the steam flow F s , Steam inlet temperature T si , Steam inlet pressure P si , Steam outlet temperature T so , Steam outlet pressure P so After being converted into digital signals, they are sent to the host computer 1; In the host computer 1, according to T si and P si Calculate the steam inlet enthalpy H by looking up the table i , according to T so and P so Calculate the steam outlet enthalpy H by looking up the table o ; The health assessment of the fuel atomizing heater of the ship main engine using the above-mentioned online monitoring platform includes the following steps: Step 1: Calculate the superheat characteristic parameter λ o Overheat characteristic parameter λ that characterizes the degree of fuel overheating o It can be calculated by the following formula (1): The variable t is the cumulative working time of the fuel atomizing heater; Step 2: Calculate the endothermic characteristic parameter λ a Heat absorption characteristic parameter λ that characterizes the fuel heat absorption condition a It can be calculated by the following formula (2): Step 3: Calculate the heat release characteristic parameter λ r Heat release characteristic parameter λ that characterizes steam heat release conditions r It can be calculated by the following formula (3): λ r =∫0 t F s (H i -H o )dt (3) Step 4: Calculate the mist heater health factor ξ The health factor ξ that characterizes the working performance of the atomizing heater can be calculated by the following formula (4): Step 5: Evaluate the health of the main engine fuel atomization heater according to the value range of ξ When ξ∈(0.7,1], it indicates that the main engine fuel atomizing heater is working normally and no manual intervention is required. The health background in the upper computer monitoring software interface is displayed as green; when ξ∈(0.4,0.7], it indicates that the working state of the main engine fuel atomizing heater begins to deteriorate, and the heat exchange efficiency and flow performance are reduced. The health background in the upper computer monitoring software interface is displayed as yellow for early warning, and maintenance should be arranged in time; when ξ∈(0,0.4], it indicates that the working state of the main engine fuel atomizing heater is seriously deteriorated, and the heat exchange efficiency and flow performance are significantly reduced. The health background in the upper computer monitoring software interface is displayed as red and a general cabin alarm is issued. The standby or emergency heater should be switched immediately and maintenance should be arranged; it should be noted that after the maintenance is completed, the accumulated working time variable t of the atomizing heater should be reset (restored to 0).

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