Marine medium-pressure air compressor energy efficiency grade grading method and application

Abstract

The invention discloses an energy efficiency grade grading method for a marine medium-pressure air compressor. The method comprises the following steps: S1, establishing a standard medium-pressure air compressor energy efficiency calculation model to calculate specific power; s2, the power and the volume flow average value of the typical medium-pressure air compressor under the rated working condition are measured firstly, and then the rated specific power is calculated; s3, the maximum value of the power and the volume flow of the typical medium-pressure air compressor under the rated working condition is measured firstly, and then the minimum specific power, namely the specific power limit value, is calculated; s4, the grading standard of the energy efficiency grade of the medium-pressure air compressor is formulated on the basis of the specific power limit value of the typical medium-pressure air compressor; and S5, calculating the rated specific power of the target medium-pressure air compressor, substituting the rated specific power into the energy efficiency grade grading standard, and comparing the rated specific power with the specific power limit value of the typical medium-pressure air compressor to obtain the energy efficiency grade of the target medium-pressure air compressor. According to the energy efficiency grade grading method, energy efficiency grade grading is conducted on the medium-pressure air compressor through the energy efficiency grade grading standard, and the vacancy of the medium-pressure air compressor in the field of energy efficiency grade grading is filled up.

Description

Technical Field

[0001] The invention relates to marine mechanical equipment and belongs to the field of air compressors, and in particular to an energy efficiency grading method and application of marine medium-pressure air compressors. Background Art

[0002] Marine air compressors are air compression equipment specially designed for ships and offshore platforms. They have high reliability, durability and corrosion resistance, and can operate stably for a long time in marine environments. Marine air compressors can be divided into low-pressure, medium-pressure, high-pressure air compressors and ultra-high-pressure air compressors according to exhaust pressure. These levels of division help ships choose suitable air compressors in different systems and applications to ensure efficient and reliable operation of the equipment.

[0003] The Chinese patent application with application number CN202110639650.0 and application date June 8, 2021 discloses a real-time measurement and real-calibration system and method for air compressors, including: an acquisition unit for real-time detection of various data of the air compressor; an operation control unit for comparing the rated pressure value of the air compressor with the actual detection value of the acquisition unit, forming a control quantity and outputting an analog signal of the control quantity, and automatically adjusting the air outlet volume of the electric proportional valve on the outlet pipeline of the air compressor through the analog signal, so that the air compressor can continue to be stable at the rated pressure load operating condition. Under the rated pressure load operating condition, the real-time flow rate and unit power of the air compressor are detected in real time, so as to calculate the unit specific power of the air compressor for energy efficiency grade calibration; an output unit is used to generate a QR code of the measured data according to the energy efficiency result calculated by the operation control unit, and display and label it. The invention enables each air compressor to perform real and effective energy efficiency detection before leaving the factory, real-time detection, easy implementation, and time-saving and labor-saving, but the technology has the following defects:

[0004] In the above-mentioned comparative documents, the energy efficiency grade classification table in the national standard positive displacement air compressor energy efficiency limit value and energy efficiency grade can be used to classify the air compressor's energy efficiency, which can be used to select air compressors with appropriate energy efficiency grades. However, the energy efficiency grade classification table can only classify the energy efficiency of low-pressure air compressors and cannot be applied to medium-pressure air compressors. Therefore, there is no energy efficiency grade classification table for reference for medium-pressure air compressors, and energy efficiency grade classification cannot be performed on medium-pressure air compressors.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0006] The purpose of the present invention is to overcome the problem in the prior art that there is no energy efficiency rating for medium-pressure air compressors, and to provide a method for grading the energy efficiency of marine medium-pressure air compressors for grading the energy efficiency of medium-pressure air compressors.

[0007] To achieve the above objectives, the technical solution of the present invention is: a method for grading the energy efficiency of marine medium-pressure air compressors, the method comprising the following steps:

[0008] S1. Establish a standard medium-pressure air compressor energy efficiency calculation model to calculate the specific power of the medium-pressure air compressor. The energy efficiency calculation model inputs power and volume flow and outputs specific power;

[0009] S2. First, measure the power and volume flow average of a typical medium-pressure air compressor under rated conditions using a measuring tool, and then calculate the rated specific power using an energy efficiency calculation model;

[0010] S3. First, measure the maximum power and volume flow of a typical medium-pressure air compressor under rated conditions through a measuring tool, then calculate the minimum specific power through an energy efficiency calculation model, and use it as the specific power limit.

[0011] S4. The obtained specific power limit value of a typical medium-pressure air compressor is used as a basis to formulate a grading standard for the energy efficiency grade of a medium-pressure air compressor;

[0012] S5. First calculate the rated specific power of the target medium-pressure air compressor according to the steps of S2, then substitute it into the medium-pressure air compressor energy efficiency grade classification standard, and then compare it with the specific power limit value of the typical medium-pressure air compressor to obtain the energy efficiency grade of the target medium-pressure air compressor.

[0013] In step 1, the energy efficiency calculation model is:

[0014] e=P / Q;

[0015] P=1.732×U×I×cos∮×η;

[0016]

[0017] In the formula: e is specific power; P is power; Q is volume flow; U is voltage; I is current; cos∮ is motor power factor; η is motor efficiency; V is the sum of the volume of the air bottle and the volume of the pipeline; t is the inflation time; Px1 is the first-stage suction pressure; Tx1 is the first-stage suction temperature; Pk1 is the gas pressure of the gas tank at the beginning of inflation; Tk1 is the gas temperature of the gas tank at the beginning of inflation; Pk2 is the gas pressure of the gas tank at the end of inflation; Tk2 is the gas temperature of the gas tank at the end of inflation.

[0018] In step S2, the rated specific power of the typical medium-pressure air compressor is obtained according to the following steps:

[0019] Step 1: Debug the typical medium-pressure air compressor to the rated working condition through valve adjustment and make it run;

[0020] Step 2: First, use a voltmeter and an ammeter to measure the corresponding voltage U and current I at the motor of a typical medium-pressure air compressor, and then calculate the corresponding power P based on the measured voltage U and current I;

[0021] Step 3: First, use the pressure sensor and the temperature sensor to measure the corresponding gas temperature Tk1 and gas pressure Pk1 on the gas cylinder at the beginning of inflation, and the corresponding gas temperature Tk2 and gas pressure Pk2 on the gas cylinder at the end of inflation, and then calculate the corresponding volume flow average value during the inflation process based on the measured gas temperature and gas pressure;

[0022] Step 4: Calculate the rated specific power e of a typical medium-pressure air compressor based on the power P and volume flow Q obtained in steps 2 and 3.

[0023] The volume flow of the typical medium-pressure air compressor is measured by a flow meter arranged on an exhaust pipe of the typical medium-pressure air compressor;

[0024] In step S3, the specific power limit value of the typical medium-pressure air compressor is obtained according to the following steps:

[0025] Step 1: Debug the typical medium-pressure air compressor to the rated working condition through valve adjustment and make it run;

[0026] Step 2: First, use a voltmeter and an ammeter to measure the corresponding voltage U and current I at the motor of a typical medium-pressure air compressor, and then calculate the corresponding power P based on the measured voltage U and current I;

[0027] Step 3: When a typical medium-pressure air compressor is inflating the corresponding gas cylinder, the volume flow Q at each moment of the inflation process is continuously measured by a flow meter installed on the exhaust pipe, and the volume flow Q at each moment is recorded. Then, the volume flow Q at all moments is compared, and the maximum value is selected as the maximum volume flow Q.

[0028] Step 4: Calculate the minimum specific power based on the power p measured in the second and third steps and the maximum volume flow rate Q as the specific power limit value e1 of the typical medium-pressure air compressor.

[0029] In step S4, the grading standard of the energy efficiency grade of the medium pressure air compressor is:

[0030] Three energy efficiency grading standards are formulated based on the calculated specific power limit values ​​of typical medium-pressure air compressors, which are used to grade the energy efficiency of medium-pressure air compressors. The three energy efficiency grading standards are:

[0031] First-level energy efficiency: e≤e1;

[0032] Secondary energy efficiency: e1<e≤1.1e1;

[0033] Level 3 energy efficiency: 1.1e1≤e;

[0034] Where: e1 is the specific power limit value.

[0035] In step S5, the energy efficiency level of the target medium-pressure air compressor is obtained according to the following steps:

[0036] First, the obtained target medium-compressor air compressor rated power ratio is substituted into three different energy efficiency grade classification standards, and then the energy efficiency grade to which the target medium-compressor air compressor rated power ratio belongs is determined according to the relationship between the typical medium-compressor air compressor rated power ratio limit value and the target medium-compressor air compressor rated power ratio, and finally the energy efficiency grade is used as the energy efficiency grade of the target medium-compressor air compressor.

[0037] After the target medium-pressure air compressor has completed the energy efficiency grade classification, the target medium-pressure air compressor is operated under the on-site conditions of the ship, and its real-time specific power during operation is calculated, and then the obtained real-time specific power of the target medium-pressure air compressor is compared with the rated specific power;

[0038] According to different comparison results, the operating status of the target medium-pressure air compressor can be divided into operating under rated conditions and operating under conditions deviating from rated conditions;

[0039] The target medium-pressure air compressor operates under rated conditions, and the comparison result between the real-time specific power and the rated specific power of the target medium-pressure air compressor is: the real-time specific power is equal to the rated specific power;

[0040] The target medium-pressure air compressor is operated under conditions that deviate from the rated operating conditions. There are three comparison results between the real-time specific power of the target medium-pressure air compressor and the rated specific power. The three comparison results are:

[0041] The first type: the real-time specific power is less than the rated specific power, and the real-time volume flow and power are within the tolerance range required by the standard;

[0042] The second type: the real-time specific power is greater than the rated specific power, and the real-time volume flow and power are within the tolerance range required by the standard;

[0043] The third type: the real-time specific power is greater than the rated specific power, and the real-time volume flow and power are both beyond the tolerance range required by the standard.

[0044] The target medium-pressure air compressor real-time specific power is obtained according to the following steps:

[0045] Step 1: First, use a voltmeter and an ammeter to measure the corresponding voltage U and current I at the motor of the target medium-pressure air compressor under the on-site conditions of the ship, and then calculate the corresponding real-time power P based on the measured voltage U and current I;

[0046] Step 2: First, use the pressure sensor and the temperature sensor to measure the corresponding gas temperature Tk1 and gas pressure Pk1 on the gas cylinder at the beginning of inflation, and the corresponding gas temperature Tk2 and gas pressure Pk2 on the gas cylinder at the end of inflation, and then calculate the corresponding volume flow average value Q during the inflation process based on the measured gas temperature and gas pressure;

[0047] Step 3: Calculate the real-time specific power e of the target medium-pressure air compressor based on the power P and the average volume flow rate Q obtained in the first and second steps.

[0048] If the real-time volumetric flow rate of the target medium-pressure air compressor is inconsistent with the rated volumetric flow rate, and the real-time power is inconsistent with the rated power, it can be determined that the target medium-pressure air compressor is operating under deviated from the rated operating conditions. However, if the real-time volumetric flow rate and power are within the tolerance range required by the standard, it is determined that the working state of the target medium-pressure air compressor is normal and within a reasonable tolerance range.

[0049] If the real-time volumetric flow rate of the target medium-pressure air compressor is inconsistent with the rated volumetric flow rate, and the real-time power is inconsistent with the rated power, it can be determined that the target medium-pressure air compressor is operating under deviated from the rated operating conditions. However, if the real-time volumetric flow rate and power both exceed the tolerance range required by the standard, it is determined that the energy efficiency of the target medium-pressure air compressor has decreased.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] 1. The present invention provides a marine medium-pressure air compressor energy efficiency grading method, which mainly includes: S1, establishing a standard medium-pressure air compressor energy efficiency calculation model for calculating the specific power of the medium-pressure air compressor; S2, first measuring the average value of the power and volume flow of a typical medium-pressure air compressor under rated conditions, and then using the energy efficiency calculation model to calculate the rated specific power; S3, first measuring the maximum value of the power and volume flow of a typical medium-pressure air compressor under rated conditions, and then calculating the minimum specific power through the energy efficiency calculation model, and using it as the specific power limit value; S4, using the obtained typical medium-pressure air compressor specific power limit value as a basis to formulate the energy efficiency grade of the medium-pressure air compressor Classification standard; S5. First calculate the rated specific power of the target medium-compressor air compressor according to the steps of S2, and then substitute it into the medium-compressor air compressor energy efficiency grade classification standard, and then compare it with the typical medium-compressor air compressor specific power limit value to obtain the energy efficiency grade of the target medium-compressor air compressor. When applied, formulate the energy efficiency grade classification standard according to the typical medium-compressor air compressor specific power limit value, and then compare the rated specific power of the target medium-compressor air compressor with the energy efficiency grade classification standard to obtain the energy efficiency grade of the target medium-compressor air compressor. Therefore, this design can perform energy efficiency grade classification for medium-compressor air compressors, filling the gap in the field of energy efficiency grade classification for medium-compressor air compressors.

[0052] 2. The present invention provides a method for grading the energy efficiency level of a marine medium-pressure air compressor. First, a voltmeter and an ammeter are used to measure the corresponding voltage and current on the motor and calculate the corresponding power. Then, in the process of a typical medium-pressure air compressor inflating a corresponding gas storage cylinder, a flow meter is used to measure the maximum volume flow rate during the inflation process. Then, based on the measured power and the maximum volume flow rate, a minimum specific power is calculated as a specific power limit value of the typical medium-pressure air compressor. When applied, after the minimum specific power of the typical medium-pressure air compressor is calculated, it is used as the specific power limit value of the typical medium-pressure air compressor. The minimum specific power has the best power consumption and the minimum specific power. As a grading standard, it is more reasonable when grading energy efficiency levels. Therefore, the present design is reasonable and effective when grading energy efficiency levels.

[0053] 3. The present invention provides a method for grading the energy efficiency of a marine medium-pressure air compressor. According to a typical medium-pressure air compressor power ratio limit value, three energy efficiency grading standards are formulated for grading the energy efficiency of the medium-pressure air compressor. The three energy efficiency grading standards are: first-level energy efficiency: e≤e1; second-level energy efficiency: e1<e≤1.1e1; third-level energy efficiency: 1.1e1≤e; when applied, the typical medium-pressure air compressor power ratio limit value is used as a reference standard to formulate grading standards for three energy efficiency grades of the medium-pressure air compressor, which are used to grade the energy efficiency of the target medium-pressure air compressor. Therefore, the design can determine the energy efficiency grade of the target medium-pressure air compressor through the energy efficiency grade grading standards.

[0054] 4. The present invention provides an application of a method for grading the energy efficiency level of a marine medium-compressor air compressor. After the target medium-compressor air compressor has completed the energy efficiency level grading, the target medium-compressor air compressor is operated under the on-site conditions of the ship, and its real-time specific power during operation is calculated. Subsequently, the obtained real-time specific power of the target medium-compressor air compressor is compared with the rated specific power. According to different comparison results, the operating state of the target medium-compressor air compressor can be divided into operation under rated conditions and operation deviating from rated conditions. When applied, the state of the target medium-compressor air compressor when operating under ship conditions can be obtained according to the comparison result of the real-time specific power of the target medium-compressor air compressor and the rated specific power. Then, according to the comparison result of the real-time volumetric flow rate, power and tolerance range, the working state and energy efficiency state of the target medium-compressor air compressor can be determined. Therefore, the present design can determine the operating state, working state and energy efficiency state of the target medium-compressor air compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 The present invention is a flow chart of a method for grading energy efficiency levels of a marine medium-pressure air compressor.

[0056] Figure 2 The present invention is a schematic diagram of the composition of an air compressor system in a method for grading energy efficiency levels of a marine medium-pressure air compressor.

[0057] Figure 3 The present invention is a schematic diagram of air compressor system data measurement in a method for grading energy efficiency levels of a marine medium-pressure air compressor. DETAILED DESCRIPTION

[0058] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0059] A method for grading energy efficiency of a marine medium-pressure air compressor, the method comprising the following steps:

[0060] S1. Establish a standard medium-pressure air compressor energy efficiency calculation model to calculate the specific power of the medium-pressure air compressor. The energy efficiency calculation model inputs power and volume flow and outputs specific power;

[0061] S2. First, measure the power and volume flow average of a typical medium-pressure air compressor under rated conditions using a measuring tool, and then calculate the rated specific power using an energy efficiency calculation model;

[0062] S3. First, measure the maximum power and volume flow rate of a typical medium-pressure air compressor under rated conditions by using a measuring tool, and then calculate the minimum specific power by using an energy efficiency calculation model, and use it as the specific power limit value;

[0063] S4. The obtained specific power limit value of a typical medium-pressure air compressor is used as a basis to formulate a grading standard for the energy efficiency grade of a medium-pressure air compressor;

[0064] S5. First calculate the rated specific power of the target medium-pressure air compressor according to the steps of S2, then substitute it into the medium-pressure air compressor energy efficiency grade classification standard, and then compare it with the specific power limit value of the typical medium-pressure air compressor to obtain the energy efficiency grade of the target medium-pressure air compressor.

[0065] In step 1, the energy efficiency calculation model is:

[0066] e=P / Q;

[0067] P=1.732×U×I×cos∮×η;

[0068]

[0069] In the formula: e is specific power; P is power; Q is volume flow; U is voltage; I is current; cos∮ is motor power factor; η is motor efficiency; V is the sum of the volume of the air bottle and the volume of the pipeline; t is the inflation time; Px1 is the first-stage suction pressure; Tx1 is the first-stage suction temperature; Pk1 is the gas pressure of the gas tank at the beginning of inflation; Tk1 is the gas temperature of the gas tank at the beginning of inflation; Pk2 is the gas pressure of the gas tank at the end of inflation; Tk2 is the gas temperature of the gas tank at the end of inflation.

[0070] In step S2, the rated specific power of the typical medium-pressure air compressor is obtained according to the following steps:

[0071] Step 1: Debug the typical medium-pressure air compressor to the rated working condition through valve adjustment and make it run;

[0072] Step 2: First, use a voltmeter and an ammeter to measure the corresponding voltage U and current I at the motor of a typical medium-pressure air compressor, and then calculate the corresponding power P based on the measured voltage U and current I;

[0073] Step 3: First, use the pressure sensor and the temperature sensor to measure the corresponding gas temperature Tk1 and gas pressure Pk1 on the gas cylinder at the beginning of inflation, and the corresponding gas temperature Tk2 and gas pressure Pk2 on the gas cylinder at the end of inflation, and then calculate the corresponding volume flow average value during the inflation process based on the measured gas temperature and gas pressure;

[0074] Step 4: Calculate the rated specific power e of a typical medium-pressure air compressor based on the power P and volume flow Q obtained in steps 2 and 3.

[0075] The volume flow of the typical medium-pressure air compressor is measured by a flow meter arranged on an exhaust pipe of the typical medium-pressure air compressor;

[0076] In step S3, the specific power limit value of the typical medium-pressure air compressor is obtained according to the following steps:

[0077] Step 1: Debug the typical medium-pressure air compressor to the rated working condition through valve adjustment and make it run;

[0078] Step 2: First, use a voltmeter and an ammeter to measure the corresponding voltage U and current I at the motor of a typical medium-pressure air compressor, and then calculate the corresponding power P based on the measured voltage U and current I;

[0079] Step 3: When a typical medium-pressure air compressor is inflating the corresponding gas cylinder, the volume flow Q at each moment of the inflation process is continuously measured by a flow meter installed on the exhaust pipe, and the volume flow Q at each moment is recorded. Then, the volume flow Q at all moments is compared, and the maximum value is selected as the maximum volume flow Q.

[0080] Step 4: Calculate the minimum specific power based on the power p measured in the second and third steps and the maximum volume flow rate Q as the specific power limit value e1 of the typical medium-pressure air compressor.

[0081] In step S4, the grading standard of the energy efficiency grade of the medium pressure air compressor is:

[0082] Three energy efficiency grading standards are formulated based on the calculated specific power limit values ​​of typical medium-pressure air compressors, which are used to grade the energy efficiency of medium-pressure air compressors. The three energy efficiency grading standards are:

[0083] First-level energy efficiency: e≤e1;

[0084] Secondary energy efficiency: e1<e≤1.1e1;

[0085] Level 3 energy efficiency: 1.1e1≤e;

[0086] Where: e1 is the specific power limit value.

[0087] In step S5, the energy efficiency level of the target medium-pressure air compressor is obtained according to the following steps:

[0088] First, the obtained target medium-compressor air compressor rated power ratio is substituted into three different energy efficiency grade classification standards, and then the energy efficiency grade to which the target medium-compressor air compressor rated power ratio belongs is determined according to the relationship between the typical medium-compressor air compressor rated power ratio limit value and the target medium-compressor air compressor rated power ratio, and finally the energy efficiency grade is used as the energy efficiency grade of the target medium-compressor air compressor.

[0089] After the target medium-pressure air compressor has completed the energy efficiency grade classification, the target medium-pressure air compressor is operated under the on-site conditions of the ship, and its real-time specific power during operation is calculated, and then the obtained real-time specific power of the target medium-pressure air compressor is compared with the rated specific power;

[0090] According to different comparison results, the operating status of the target medium-pressure air compressor can be divided into operating under rated conditions and operating under conditions deviating from rated conditions;

[0091] The target medium-pressure air compressor operates under rated conditions, and the comparison result between the real-time specific power and the rated specific power of the target medium-pressure air compressor is: the real-time specific power is equal to the rated specific power;

[0092] The target medium-pressure air compressor is operated under conditions that deviate from the rated operating conditions. There are three comparison results between the real-time specific power of the target medium-pressure air compressor and the rated specific power. The three comparison results are:

[0093] The first type: the real-time specific power is less than the rated specific power, and the real-time volume flow and power are within the tolerance range required by the standard;

[0094] The second type: the real-time specific power is greater than the rated specific power, and the real-time volume flow and power are within the tolerance range required by the standard;

[0095] The third type: the real-time specific power is greater than the rated specific power, and the real-time volume flow and power are both beyond the tolerance range required by the standard.

[0096] The target medium-pressure air compressor real-time specific power is obtained according to the following steps:

[0097] Step 1: First, use a voltmeter and an ammeter to measure the corresponding voltage U and current I at the motor of the target medium-pressure air compressor under the on-site conditions of the ship, and then calculate the corresponding real-time power P based on the measured voltage U and current I;

[0098] Step 2: First, use the pressure sensor and the temperature sensor to measure the corresponding gas temperature Tk1 and gas pressure Pk1 on the gas cylinder at the beginning of inflation, and the corresponding gas temperature Tk2 and gas pressure Pk2 on the gas cylinder at the end of inflation, and then calculate the corresponding volume flow average value Q during the inflation process based on the measured gas temperature and gas pressure;

[0099] Step 3: Calculate the real-time specific power e of the target medium-pressure air compressor based on the power P and the average volume flow rate Q obtained in the first and second steps.

[0100] If the real-time volumetric flow rate of the target medium-pressure air compressor is inconsistent with the rated volumetric flow rate, and the real-time power is inconsistent with the rated power, it can be determined that the target medium-pressure air compressor is operating under deviated from the rated operating conditions. However, if the real-time volumetric flow rate and power are within the tolerance range required by the standard, it is determined that the working state of the target medium-pressure air compressor is normal and within a reasonable tolerance range.

[0101] If the real-time volumetric flow rate of the target medium-pressure air compressor is inconsistent with the rated volumetric flow rate, and the real-time power is inconsistent with the rated power, it can be determined that the target medium-pressure air compressor is operating under deviated from the rated operating conditions. However, if the real-time volumetric flow rate and power both exceed the tolerance range required by the standard, it is determined that the energy efficiency of the target medium-pressure air compressor has decreased.

[0102] The supplementary technical features of the present invention are as follows:

[0103] The exhaust pressure of the medium-pressure air compressor involved in the present invention is preferably 3.0Mpa; the rated working conditions involved are: ambient temperature 20 degrees, 0.1013MPa standard atmospheric pressure;

[0104] The flowmeter used to measure the volume flow in the present invention is preferably a FLUX210 gas swirl flowmeter;

[0105] The energy efficiency reduction of the target medium-pressure air compressor in the present invention is caused by abnormalities in the medium-pressure air compressor, which include poor piston ring sealing, air valve leakage, blockage of the inlet and outlet ports, or wear of the cylinder.

[0106] Embodiment 1:

[0107] See also Figure 1-Figure 3 , a method for grading energy efficiency of a marine medium-pressure air compressor, the method comprising the following steps:

[0108] S1. Establish a standard medium-pressure air compressor energy efficiency calculation model to calculate the specific power of the medium-pressure air compressor. The energy efficiency calculation model inputs power and volume flow and outputs specific power;

[0109] In step 1, the energy efficiency calculation model is:

[0110] e=P / Q;

[0111] P=1.732×U×I×cos∮×η;

[0112]

[0113] In the formula: e is specific power; P is power; Q is volume flow; U is voltage; I is current; cos∮ is motor power factor; η is motor efficiency; V is the sum of the volume of the air bottle and the volume of the pipeline; t is the inflation time; Px1 is the first-stage suction pressure; Tx1 is the first-stage suction temperature; Pk1 is the gas pressure of the gas tank at the beginning of inflation; Tk1 is the gas temperature of the gas tank at the beginning of inflation; Pk2 is the gas pressure of the gas tank at the end of inflation; Tk2 is the gas temperature of the gas tank at the end of inflation;

[0114] S2. First, measure the power and volume flow average of a typical medium-pressure air compressor under rated conditions using a measuring tool, and then calculate the rated specific power using an energy efficiency calculation model;

[0115] S3. First, measure the maximum power and volume flow rate of a typical medium-pressure air compressor under rated conditions by using a measuring tool, and then calculate the minimum specific power by using an energy efficiency calculation model, and use it as the specific power limit value;

[0116] S4. The obtained specific power limit value of a typical medium-pressure air compressor is used as a basis to formulate a grading standard for the energy efficiency grade of a medium-pressure air compressor;

[0117] S5. First calculate the rated specific power of the target medium-compressor air compressor according to the steps of S2, and then substitute it into the medium-compressor air compressor energy efficiency grade classification standard, and then compare it with the typical medium-compressor air compressor specific power limit value to obtain the energy efficiency grade of the target medium-compressor air compressor; in the step S5, the energy efficiency grade of the target medium-compressor air compressor is obtained according to the following steps: first substitute the obtained target medium-compressor air compressor rated specific power into three different energy efficiency grade classification standards, and then determine the energy efficiency grade to which the target medium-compressor air compressor rated specific power belongs according to the relationship between the typical medium-compressor air compressor specific power limit value and the target medium-compressor air compressor rated specific power, and finally use the energy efficiency grade as the energy efficiency grade of the target medium-compressor air compressor.

[0118] The energy efficiency grade classification method for marine medium-pressure air compressors obtains the rated specific power and specific power limit value of typical medium-pressure air compressors by calculation, and formulates energy efficiency grade classification standards based on the specific power limit value. After the rated specific power of the target medium-pressure air compressor is substituted into the energy efficiency grade classification standard, the energy efficiency grade of the target medium-pressure air compressor can be determined through comparison, filling the gap that there is no energy efficiency grade classification standard for medium-pressure air compressors.

[0119] Embodiment 2:

[0120] The basic content is the same as that of Example 1, except that:

[0121] See also Figure 1-Figure 3 , in step S2, the rated specific power of the typical medium-pressure air compressor is obtained according to the following steps: the first step: adjust the typical medium-pressure air compressor to the rated working condition through valve adjustment and make it run; the second step: first measure the corresponding voltage U and current I at the motor of the typical medium-pressure air compressor through a voltmeter and an ammeter, and then calculate the corresponding power P according to the measured voltage U and current I; the third step: first measure the corresponding gas temperature Tk1 and gas pressure Pk1 on the gas cylinder at the beginning of inflation and the corresponding gas temperature Tk2 and gas pressure Pk2 on the gas cylinder at the end of inflation through a pressure sensor and a temperature sensor, and then calculate the corresponding volume flow rate average value during the inflation process according to the measured gas temperature and gas pressure; the fourth step: calculate the rated specific power e of the typical medium-pressure air compressor according to the power P and volume flow rate Q obtained in the second and third steps.

[0122] Embodiment 3:

[0123] The basic content is the same as that of Example 1, except that:

[0124] See also Figure 1-Figure 3 The volume flow of the typical medium-pressure air compressor is measured according to the flow meter installed on the exhaust pipe of the typical medium-pressure air compressor; in the step S3, the specific power limit value of the typical medium-pressure air compressor is obtained according to the following steps: the first step: the typical medium-pressure air compressor is debugged to the rated working condition by valve adjustment and made to run; the second step: firstly, the corresponding voltage U and current I at the motor of the typical medium-pressure air compressor are measured by the voltmeter and the ammeter, and then the corresponding power P is calculated according to the measured voltage U and current I; the third step: in the process of the typical medium-pressure air compressor filling the corresponding gas storage bottle, the specific power limit value is obtained by the flow meter installed in the exhaust pipe The flow meter on the machine continuously measures the volume flow Q at each moment during the inflation process and records it, then compares the volume flow Q corresponding to all moments, and selects the maximum value as the maximum volume flow Q; Step 4: Calculate the minimum specific power based on the power p and the maximum volume flow Q measured in the second and third steps as the specific power limit value e1 of a typical medium-pressure air compressor; The following table shows the specific power values ​​of each model of air compressor at two speeds of 380V / 50Hz and 440V / 60Hz. From this table, it can be obtained that each model of air compressor uses the level 1 specific power, that is, the minimum specific power, as the specific power limit value.

[0125]

[0126] By selecting the minimum specific power as the specific power limit value of the medium-pressure air compressor, the energy efficiency grade classification standard of the medium-pressure air compressor can be more reasonable when it is formulated. The minimum specific power has the best power consumption and the smallest specific power. Using it as the specific power limit value can also make the energy efficiency grade classification standard of the medium-pressure air compressor more scientific.

[0127] Embodiment 4:

[0128] The basic content is the same as that of Example 1, except that:

[0129] See also Figure 1 In step S4, the grading standard of the energy efficiency grade of the medium-pressure air compressor refers to: formulating three energy efficiency grade grading standards based on the calculated specific power limit value of the typical medium-pressure air compressor, which are used to grade the energy efficiency of the medium-pressure air compressor, and the three energy efficiency grade grading standards are: first-level energy efficiency: e≤e1; second-level energy efficiency: e1<e≤1.1e1; third-level energy efficiency: 1.1e1≤e; where: e1 is the specific power limit value.

[0130] Three energy efficiency grade ranges are formulated based on the specific power limit values ​​of typical medium-pressure air compressors. The energy efficiency grade range division is scientific and reasonable, providing a basis for grading the energy efficiency of target medium-pressure air compressors according to their rated specific power.

[0131] Embodiment 5:

[0132] The basic content is the same as that of Example 1, except that:

[0133] See also Figure 1, an application of a marine medium-compressor air compressor energy efficiency rating method, after the target medium-compressor air compressor has completed energy efficiency rating rating, the target medium-compressor air compressor is operated under on-site conditions of the ship, and its real-time specific power during operation is calculated, and then the obtained real-time specific power of the target medium-compressor air compressor is compared with the rated specific power; according to different comparison results, the operating state of the target medium-compressor air compressor can be divided into operating under rated conditions and operating under deviated rated conditions; when the target medium-compressor air compressor operates under rated conditions, the comparison result between the real-time specific power of the target medium-compressor air compressor and the rated specific power is: the real-time specific power is equal to the rated specific power; the target medium-compressor air compressor deviates from the rated conditions When operating under rated conditions, there are three comparison results between the real-time specific power and the rated specific power of the target medium-compressor air compressor, and the three comparison results are: the first: the real-time specific power is less than the rated specific power, and the real-time volumetric flow and power are within the tolerance range required by the standard; the second: the real-time specific power is greater than the rated specific power, and the real-time volumetric flow and power are within the tolerance range required by the standard; the third: the real-time specific power is greater than the rated specific power, and the real-time volumetric flow and power are both outside the tolerance range required by the standard; the real-time specific power of the target medium-compressor air compressor is obtained according to the following steps: the first step: first measure the ship's on-site power by a voltmeter and an ammeter The corresponding voltage U and current I at the motor of the target medium-pressure air compressor under the conditions, and then calculate the corresponding real-time power P according to the measured voltage U and current I; the second step: first measure the corresponding gas temperature Tk1 and gas pressure Pk1 on the gas cylinder at the beginning of inflation and the corresponding gas temperature Tk2 and gas pressure Pk2 on the gas cylinder at the end of inflation through the pressure sensor and temperature sensor, and then calculate the corresponding volume flow average value Q during the inflation process according to the measured gas temperature and gas pressure; the third step: calculate the real-time power of the target medium-pressure air compressor according to the power P and volume flow average value Q obtained in the first and second steps. Specific power e; if the real-time volumetric flow rate of the target medium-compressor air compressor is inconsistent with the rated volumetric flow rate, and the real-time power is inconsistent with the rated power, it can be determined that the target medium-compressor air compressor is operating under deviated from the rated operating conditions, but if the real-time volumetric flow rate and power are within the tolerance range required by the standard, it is determined that the working state of the target medium-compressor air compressor is normal and within a reasonable tolerance range; if the real-time volumetric flow rate of the target medium-compressor air compressor is inconsistent with the rated volumetric flow rate, and the real-time power is inconsistent with the rated power, it can be determined that the target medium-compressor air compressor is operating under deviated from the rated operating conditions, but if the real-time volumetric flow rate and power are both beyond the tolerance range required by the standard, it is determined that the energy efficiency of the target medium-compressor air compressor is reduced.

[0134] By comparing the real-time specific power of the target medium-pressure air compressor with the rated specific power, the state of the target medium-pressure air compressor when operating under ship conditions can be obtained. At the same time, it can be judged whether the measured real-time volume flow and power exceed the tolerance range, and the working state and energy efficiency state of the target medium-pressure air compressor can be determined.

[0135] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A method for grading the energy efficiency of marine medium-pressure air compressors, characterized in that: The method comprises the following steps: S1. Establish a standard medium-pressure air compressor energy efficiency calculation model to calculate the specific power of the medium-pressure air compressor. The energy efficiency calculation model inputs power and volume flow and outputs specific power; S2. First, measure the power and volume flow average of a typical medium-pressure air compressor under rated conditions using a measuring tool, and then calculate the rated specific power using an energy efficiency calculation model; S3. First, measure the maximum power and volume flow rate of a typical medium-pressure air compressor under rated conditions by using a measuring tool, and then calculate the minimum specific power by using an energy efficiency calculation model, and use it as the specific power limit value; S4. The obtained specific power limit value of a typical medium-pressure air compressor is used as a basis to formulate a grading standard for the energy efficiency grade of a medium-pressure air compressor; S5. First calculate the rated specific power of the target medium-pressure air compressor according to the steps of S2, then substitute it into the medium-pressure air compressor energy efficiency grade classification standard, and then compare it with the specific power limit value of the typical medium-pressure air compressor to obtain the energy efficiency grade of the target medium-pressure air compressor.

2. A method for grading energy efficiency of marine medium-pressure air compressors according to claim 1, characterized in that: In step 1, the energy efficiency calculation model is: e=P / Q; P=1.732×U×I×cos∮×η; In the formula: e is specific power; P is power; Q is volume flow; U is voltage; I is current; cos∮ is motor power factor; η is motor efficiency; V is the sum of the volume of the air bottle and the volume of the pipeline; t is the inflation time; Px1 is the first-stage suction pressure; Tx1 is the first-stage suction temperature; Pk1 is the gas pressure of the gas tank at the beginning of inflation; Tk1 is the gas temperature of the gas tank at the beginning of inflation; Pk2 is the gas pressure of the gas tank at the end of inflation; Tk2 is the gas temperature of the gas tank at the end of inflation.

3. A method for grading energy efficiency of marine medium-pressure air compressors according to claim 2, characterized in that: In step S2, the rated specific power of the typical medium-pressure air compressor is obtained according to the following steps: Step 1: Debug the typical medium-pressure air compressor to the rated working condition through valve adjustment and make it run; Step 2: First, use a voltmeter and an ammeter to measure the corresponding voltage U and current I at the motor of a typical medium-pressure air compressor, and then calculate the corresponding power P based on the measured voltage U and current I; Step 3: First, use the pressure sensor and the temperature sensor to measure the corresponding gas temperature Tk1 and gas pressure Pk1 on the gas cylinder at the beginning of inflation, and the corresponding gas temperature Tk2 and gas pressure Pk2 on the gas cylinder at the end of inflation, and then calculate the corresponding volume flow average value during the inflation process based on the measured gas temperature and gas pressure; Step 4: Calculate the rated specific power e of a typical medium-pressure air compressor based on the power P and volume flow Q obtained in steps 2 and 3.

4. A method for grading energy efficiency of marine medium-pressure air compressors according to claim 2, characterized in that: The volume flow of the typical medium-pressure air compressor is measured by a flow meter arranged on an exhaust pipe of the typical medium-pressure air compressor; In step S3, the specific power limit value of the typical medium-pressure air compressor is obtained according to the following steps: Step 1: Debug the typical medium-pressure air compressor to the rated working condition through valve adjustment and make it run; Step 2: First, use a voltmeter and an ammeter to measure the corresponding voltage U and current I at the motor of a typical medium-pressure air compressor, and then calculate the corresponding power P based on the measured voltage U and current I; Step 3: When a typical medium-pressure air compressor is inflating the corresponding gas cylinder, the volume flow Q at each moment of the inflation process is continuously measured by a flow meter installed on the exhaust pipe, and the volume flow Q at each moment is recorded. Then, the volume flow Q at all moments is compared, and the maximum value is selected as the maximum volume flow Q. Step 4: Calculate the minimum specific power based on the power p measured in the second and third steps and the maximum volume flow rate Q as the specific power limit value e1 of the typical medium-pressure air compressor.

5. A method for grading energy efficiency of marine medium-pressure air compressors according to claim 1, characterized in that: In step S4, the grading standard of the energy efficiency grade of the medium pressure air compressor is: Three energy efficiency grading standards are formulated based on the calculated specific power limit values ​​of typical medium-pressure air compressors, which are used to grade the energy efficiency of medium-pressure air compressors. The three energy efficiency grading standards are: First-level energy efficiency: e≤e1; Secondary energy efficiency: e1<e≤1.1e1; Level 3 energy efficiency: 1.1e1≤e; Where: e1 is the specific power limit value.

6. A method for grading energy efficiency of marine medium-pressure air compressors according to claim 5, characterized in that: In step S5, the energy efficiency level of the medium pressure air compressor is obtained according to the following steps: First, the obtained target medium-compressor air compressor rated power ratio is substituted into three different energy efficiency grade classification standards, and then the energy efficiency grade to which the target medium-compressor air compressor rated power ratio belongs is determined according to the relationship between the typical medium-compressor air compressor rated power ratio limit value and the target medium-compressor air compressor rated power ratio, and finally the energy efficiency grade is used as the energy efficiency grade of the target medium-compressor air compressor.

7. An application of the method for grading energy efficiency of marine medium-pressure air compressors according to claim 1, characterized in that: After the target medium-pressure air compressor has completed the energy efficiency grade classification, the target medium-pressure air compressor is operated under the on-site conditions of the ship, and its real-time specific power during operation is calculated, and then the obtained real-time specific power of the target medium-pressure air compressor is compared with the rated specific power; According to different comparison results, the operating status of the target medium-pressure air compressor can be divided into operating under rated conditions and operating under conditions deviating from rated conditions; The target medium-pressure air compressor operates under rated conditions, and the comparison result between the real-time specific power and the rated specific power of the target medium-pressure air compressor is: the real-time specific power is equal to the rated specific power; The target medium-pressure air compressor is operated under conditions that deviate from the rated operating conditions. There are three comparison results between the real-time specific power of the target medium-pressure air compressor and the rated specific power. The three comparison results are: The first type: the real-time specific power is less than the rated specific power, and the real-time volume flow and power are within the tolerance range required by the standard; The second type: the real-time specific power is greater than the rated specific power, and the real-time volume flow and power are within the tolerance range required by the standard; The third type: the real-time specific power is greater than the rated specific power, and the real-time volume flow and power are both beyond the tolerance range required by the standard.

8. The application of the method for grading energy efficiency of marine medium-pressure air compressors according to claim 7 is characterized in that: The target medium-pressure air compressor real-time specific power is obtained according to the following steps: Step 1: First, use a voltmeter and an ammeter to measure the corresponding voltage U and current I at the motor of the target medium-pressure air compressor under the on-site conditions of the ship, and then calculate the corresponding real-time power P based on the measured voltage U and current I; Step 2: First, use the pressure sensor and the temperature sensor to measure the corresponding gas temperature Tk1 and gas pressure Pk1 on the gas cylinder at the beginning of inflation, and the corresponding gas temperature Tk2 and gas pressure Pk2 on the gas cylinder at the end of inflation, and then calculate the corresponding volume flow average value Q during the inflation process based on the measured gas temperature and gas pressure; Step 3: Calculate the real-time specific power e of the target medium-pressure air compressor based on the power P and the average volume flow rate Q obtained in the first and second steps.

9. The application of the method for grading energy efficiency of marine medium-pressure air compressors according to claim 7 is characterized in that: If the real-time volumetric flow rate of the target medium-pressure air compressor is inconsistent with the rated volumetric flow rate, and the real-time power is inconsistent with the rated power, it can be determined that the target medium-pressure air compressor is operating under deviated from the rated operating conditions. However, if the real-time volumetric flow rate and power are within the tolerance range required by the standard, it is determined that the working state of the target medium-pressure air compressor is normal and within a reasonable tolerance range.

10. The application of the method for grading energy efficiency of marine medium-pressure air compressors according to claim 7, characterized in that: If the real-time volumetric flow rate of the target medium-pressure air compressor is inconsistent with the rated volumetric flow rate, and the real-time power is inconsistent with the rated power, it can be determined that the target medium-pressure air compressor is operating under deviated from the rated operating conditions. However, if the real-time volumetric flow rate and power both exceed the tolerance range required by the standard, it is determined that the energy efficiency of the target medium-pressure air compressor has decreased.

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