Evaluation method for green low-carbon compressed air station

Abstract

The invention provides a method for evaluating a green low-carbon compressed air station. The method comprises the following steps of: evaluating unit consumption carbon emission, comprehensive transmission efficiency, an automatic control system, operation and maintenance management and technical application of compressed air station gas; the compressed air station electricity consumption carbon emission and comprehensive power transmission efficiency evaluation specifically comprises the following steps: step 1) calculating the electricity consumption of the compressed air station; 2) judging whether the compressed air station outputs compressed air with the same pressure, pressure dew point and oil content or not; 3) calculating the comprehensive transmission efficiency of the compressed air station when compressed air with the same pressure, pressure dew point and oil content is calculated; the method comprises the following steps of (1) calculating the comprehensive transmission efficiency of the compressed air station when compressed air with different pressures, pressure dew points and oil contents is used, (2) calculating the unit consumption carbon emission of the compressed air station, and (6) evaluating the unit consumption carbon emission of the compressed air station.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air stations, and particularly relates to an evaluation method for a green and low-carbon compressed air station. Background Art

[0002] The air compressed by an air compressor is called compressed air. Compressed air is the second largest power energy source after electricity and is also a process gas source with various uses. Compared with other energy sources, due to its many advantages such as wide source, convenient transportation, non-toxic and harmless, green and environmental protection, and low use cost, it is currently widely used in industries and departments such as petroleum, chemical industry, metallurgy, electric power, machinery and light industry, textile, automobile manufacturing, electronics, food, medicine, biochemistry, national defense, scientific research, etc.

[0003] A green and low-carbon compressed air station is a compressed air station that uses energy reasonably, has sufficient energy-saving and carbon-reduction measures, a complete energy management system, an advanced automatic control system, and a sound management system to achieve the green operation of the system. With the enhancement of environmental protection and energy-saving awareness, many enterprises have built their own green and low-carbon compressed air stations. The existing technology lacks evaluation means for green and low-carbon compressed air stations and cannot accurately evaluate the carbon emissions per unit consumption of compressed air stations and the green and low-carbon operation level. Summary of the Invention

[0004] The purpose of the present invention is to provide an evaluation method for a green and low-carbon compressed air station.

[0005] To achieve the above purpose, the technical solution of the present invention is:

[0006] An evaluation method for a green and low-carbon compressed air station, characterized in that the carbon emissions per unit consumption of compressed air stations, the comprehensive power transmission efficiency, the automatic control system, the operation and maintenance management, and the technology application are respectively evaluated;

[0007] Among them, the evaluation of the carbon emissions per unit consumption of electricity and the comprehensive power transmission efficiency of the compressed air station specifically includes the following steps:

[0008] Step 1) Calculate the electricity consumption per unit of the compressed air station The unit is kilowatt-hours per cubic meter (kW·h / m 3 ),

[0009] In the formula, E Z —The total electricity consumption of the compressed air station during the measurement period, the unit is kilowatt-hours (kW·h),

[0010] G z —The total gas supply of the compressed air station during the measurement period, in the suction state of the air compressor, the unit is cubic meters (m 3 );

[0011] Step 2) Determine whether the compressed air station outputs compressed air with the same pressure, pressure dew point, and oil content.

[0012] If so, jump to Step 3.

[0013] If not, jump to Step 4.

[0014] Step 3) Calculate the comprehensive power transmission efficiency η of the compressed air station: η = δ × η w ,

[0015] δ = 1 + 0.2 × η R ,

[0016]

[0017] where η is the comprehensive power transmission efficiency of the compressed air station,

[0018] δ is the correction coefficient for compressed heat recovery and utilization,

[0019] η w is the power transmission efficiency of the compressed air station,

[0020] η R is the utilization rate of compressed heat energy recovery,

[0021] E R is the recovered heat of the compressed air station, in kilowatt-hours (kW·h),

[0022] E j is the electricity consumption of the jth air compressor unit, in kilowatt-hours (kW·h),

[0023] P X is the suction pressure of the air compressor, in megapascals (MPa),

[0024] Q Z is the average supply flow rate of the compressed air station during the measurement period, in cubic meters per minute (m 3 / min),

[0025] t is the measurement cycle time, in hours (h),

[0026] P Z is the supply pressure of the compressed air station, in megapascals (MPa);

[0027] E Z is the total electricity consumption of the compressed air station during the measurement period, in kilowatt-hours (kW·h);

[0028] Jump to Step 5.

[0029] Step 4) Calculate the comprehensive power transmission efficiency η of the compressed air station: η = δ × ∑η i × θi × m i × n i ,

[0030]

[0031] Q Z = ∑Q i ,

[0032]

[0033] where η i — the power transmission efficiency of the i-th compressed air path, θ i — the proportion of the gas volume of the i-th compressed air path,

[0034] m i — the oil mixing correction factor of the i-th compressed air path,

[0035] When all the configured air compressor units are oil-free machines, m i = 1.05, otherwise m i = 1,

[0036] n i — the dry dew point correction factor of the i-th compressed air path, selected according to Table a,

[0037] Table a Compressed air dry pressure dew point (PDP) correction factor (%) value table

[0038]

[0039] P X — the suction pressure of the air compressor, in megapascals (MPa),

[0040] Q i — the average supply flow rate of the i-th air supply path during the measurement period, in cubic meters per minute (m 3 / min),

[0041] P Zi — the supply pressure of the i-th compressed air station, in megapascals (MPa),

[0042] E i — the total comprehensive power consumption of the i-th path during the measurement period, in kilowatt-hours (kW·h),

[0043] Q Z — the average supply flow rate of the compressed air station during the measurement period, in cubic meters per minute (m 3 / min), E Z — the total power consumption of the compressed air station during the measurement period, in kilowatt-hours (kW·h);

[0044] Jump to step 5;

[0045] Step 5) Calculate the carbon emission per unit consumption of compressed air station

[0046] In the formula, CECA—the carbon emission per unit consumption of compressed air station, unit: kilograms of carbon dioxide equivalent per cubic meter (kgCO 2e / m 3 ),

[0047] D—the electricity consumption per unit of compressed air station, unit: kilowatt-hours per cubic meter (kW·h / m 3 ),

[0048] E g —During the measurement period, the green electricity consumption of the compressed air station, unit: kilowatt-hours (kW·h),

[0049] G Z —The total gas supply of the compressed air station during the measurement period, in the suction state of the air compressor, unit: cubic meters (m 3 ),

[0050] EF—the carbon emission factor of the regional power grid, unit: kilograms of carbon dioxide equivalent per kilowatt-hour [kgCO 2 / (kW·h)], for example, the carbon emission factor of the Shanghai regional power grid in 2023 is 0.42 kgCO 2 / (kW·h),

[0051] —The global warming potential of carbon dioxide, with a value of 1;

[0052] Step 6) Evaluate the carbon emission per unit consumption of compressed air station CECA, and the evaluation criteria are as follows:

[0053] When the evaluation score is 15 points, where E g = 0, and the value of D is substituted according to the comprehensive power transmission efficiency corresponding to the 3rd level of energy efficiency in Tables b to f, and the electricity consumption per unit corresponding to the corresponding pressure in Table g;

[0054] When the evaluation score is 25 points, where E g = 0, and the value of D is substituted according to the comprehensive power transmission efficiency corresponding to the 2nd level of energy efficiency in Tables b to f, and the electricity consumption per unit corresponding to the corresponding pressure in Table g;

[0055] When the evaluation score is 35 points, where E g = 0, and the value of D is substituted according to the comprehensive power transmission efficiency corresponding to the 1st level of energy efficiency in Tables b to f, and the electricity consumption per unit corresponding to the corresponding pressure in Table g.

[0056] Table b Energy efficiency grade of compressed air station (supply air pressure dew point ≥ 3℃)

[0057]

[0058] Table c Energy efficiency grade of compressed air station (-20℃ ≤ supply air pressure dew point < 3℃)

[0059]

[0060] Table d Energy efficiency grade of compressed air station (-40℃ ≤ supply air pressure dew point < -20℃)

[0061]

[0062] Table e Energy efficiency grade of compressed air station (-70℃ ≤ supply air pressure dew point < -40℃)

[0063]

[0064] Table f Energy efficiency grade of compressed air station (supply air pressure dew point < -70℃)

[0065]

[0066] Table g Comparison table of work transmission efficiency and unit power consumption for common pressures

[0067]

[0068]

[0069]

[0070]

[0071]

[0072] Furthermore, the evaluation of the automatic control system of the compressed air station includes evaluating whether variable frequency and optimized control of the air compressor unit or the cooling system, automatic loading operation / number of units automatic adjustment of the air compressor unit, constant pressure control of the compressed air system, automatic fault diagnosis and early warning of the station building, automatic optimization control of the system, and intelligent automatic operation of the station building are realized respectively.

[0073] Furthermore, the evaluation of the operation and maintenance management of the compressed air station includes evaluating whether the rules and regulations for the operation management of the station building are sound, the station building is clean / various signs are clear, regular inspections and regular maintenance are carried out / inspection and maintenance records are kept, independent metering meters for power consumption and gas consumption equipment are complete, energy efficiency assessment or carbon management work is carried out, a digital management system is established, and encouragement policies related to energy conservation and carbon reduction for employees are formulated respectively.

[0074] Furthermore, the evaluation of the technical application of the compressed air station includes evaluating whether to adopt an automatic air flow monitoring system, energy-saving drying and purification technology, energy-saving pipeline valve technology, Internet of Things remote monitoring technology, waste heat recovery measures / energy-saving cooling technology or other energy-saving utilization measures, intelligent green power supply system, automatic gas quality monitoring system, and prefabricated high-efficiency station building, and evaluating the system adjustment of the station building and the compressed air system.

[0075] Based on the complete operation records of the compressed air station, the present invention can comprehensively evaluate five types of indicators, namely, the comprehensive operation carbon emissions, comprehensive operation energy consumption, automatic control system, operation and maintenance management, and technical application of the compressed air station, accurately reflect the comprehensive performance of the compressed air station, issue an evaluation report, and determine the star rating of the green and low-carbon compressed air station. Detailed implementation mode

[0076] The technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0077] This embodiment discloses a method for evaluating a green and low-carbon compressed air station, which is applicable to a three-phase AC power supply with a voltage not exceeding 10 kV, an air compressor unit driven by a motor, with a single-machine rated power greater than or equal to 18.5 kW and an exhaust pressure in the range of 0.3 MPa to 1.6 MPa, a compressed air station with a gas supply capacity greater than or equal to 4 m 3 / min and the total operating power of the air compressor unit greater than or equal to 37 kW, and is also applicable to a compressed air station with an air compressor unit having an exhaust pressure lower than 0.3 MPa.

[0078] The evaluation grades of the green and low-carbon compressed air station are divided into three grades: three-star, four-star, and five-star, among which the five-star is the highest grade. The star rating evaluation standard of the compressed air station is shown in Table 1.

[0079] Table 1 Star rating evaluation standard of green and low-carbon compressed air station

[0080] Star level Control item Scoring item Three-star level Meet ≥60 points Four-star level Meet ≥70 points Five-star level Meet ≥85 points

[0081] The evaluation index system of the compressed air station consists of control items and scoring items. The green and low-carbon compressed air station should meet all the indicators of the control items. The indicators of the scoring items are scored, with a full score of 100 points, including five types of indicators such as carbon emissions per unit gas consumption, comprehensive power transmission efficiency, automatic control system, operation and maintenance management, and technical application, as shown in Table 2.

[0082] Table 2 Rating indicators of green and low-carbon compressed air station

[0083]

[0084] The carbon emission score per unit consumption of compressed air station is shown in Table 3.

[0085] Table 3 Carbon Emission per Unit Consumption of Compressed Air Station

[0086]

[0087] The comprehensive power transmission efficiency score of the compressed air station is shown in Table 4.

[0088] Table 4 Comprehensive Power Transmission Efficiency of Compressed Air Station

[0089]

[0090] The automatic control system score of the compressed air station is shown in Table 5.

[0091] Table 5 Automatic Control System of Compressed Air Station

[0092]

[0093] The operation and maintenance management score of the compressed air station is shown in Table 6.

[0094] Table 6 Operation and Maintenance Management of Compressed Air Station

[0095]

[0096] The technology application score of the compressed air station is shown in Table 7.

[0097] Table 7 Technology Application of Compressed Air Station

[0098]

[0099] The electricity consumption per unit of the compressed air station in this embodiment is calculated according to Equation (A.1):

[0100]

[0101] Where:

[0102] D—the electricity consumption per unit of the compressed air station, unit: kilowatt-hour per cubic meter (kW·h / m 3 )

[0103] E Z —the total electricity consumption of the compressed air station during the measurement period, unit: kilowatt-hour (kW·h);

[0104] Gz—the total gas supply of the compressed air station during the measurement period, in the suction state of the air compressor, unit: cubic meter (m 3 )

[0105] Conversion between electricity consumption per unit and power transmission efficiency:

[0106] The conversion of specific power consumption for electricity and power transmission efficiency is calculated according to Equation (A.2):

[0107]

[0108] Wherein:

[0109] η w — Power transmission efficiency of the compressed air station, %;

[0110] P X — Suction pressure of the air compressor (absolute pressure), unit: megapascal (MPa);

[0111] P Z — Supply pressure of the compressed air station (gauge pressure), unit: megapascal (MPa).

[0112] The compressed air station shall meet the requirements of users for the pressure, flow rate, and quality (pressure dew point, oil content, dust content) of compressed air, and then conduct energy efficiency grading. The comprehensive power transmission efficiency index of the compressed air station is used for the energy efficiency grade evaluation of the compressed air station. The energy efficiency is divided into 3 levels, among which the 1st-level energy efficiency is the best, and the 3rd-level energy efficiency is the energy conservation evaluation value.

[0113] The comprehensive power transmission efficiency of the compressed air station refers to the percentage of the available energy in the compressed air output by the compressed air station to the electric energy consumed in producing the compressed air, and comprehensively corrects the power transmission efficiency of the compressed air station considering factors such as the recovered heat energy, oil content, and humidity (dryness) of the compressed air. Its value is expressed in %.

[0114] When all the air compressors configured in the compressed air station are oil-free machines, the energy efficiency grading is evaluated according to the oil-free level; otherwise, it is evaluated according to the oiled level.

[0115] When the compressed air station has 2 or more independent compressed air production systems, the independent system parameters shall be used for assessment respectively. For the energy efficiency grades, see Tables B.1.1 to B.1.5.

[0116] Table B.1.1 Energy Efficiency Grade of Compressed Air Station (Supply Air Pressure Dew Point ≥ 3℃)

[0117]

[0118] Table B.1.2 Energy Efficiency Grade of Compressed Air Station (-20℃ ≤ Supply Air Pressure Dew Point < 3℃)

[0119]

[0120] Table B.1.3 Energy Efficiency Grade of Compressed Air Station (-40℃ ≤ Supply Air Pressure Dew Point < -20℃)

[0121]

[0122] Table B.1.4 Energy Efficiency Grade of Compressed Air Station (-70°C ≤ Dew Point of Supplied Air Pressure < -40°C)

[0123]

[0124] Table B.1.5 Energy Efficiency Grade of Compressed Air Station (Dew Point of Supplied Air Pressure < -70°C)

[0125]

[0126] Table B.1.6 Correction Coefficient (%) Value Table of Compressed Air Drying Pressure Dew Point (PDP)

[0127]

[0128] B.2.1 When the compressed air station outputs compressed air with the same parameters (pressure, pressure dew point, oil content), the energy efficiency of the compressed air station is classified according to the regulations.

[0129] The comprehensive power transmission efficiency is calculated according to Equation (B.2.1):

[0130] η = δ × η w (B.2.1)

[0131] δ = 1 + 0.2 × η R (B.2.2)

[0132]

[0133] In the formula:

[0134] η—the comprehensive power transmission efficiency of the compressed air station;

[0135] δ—the correction coefficient for compressed heat recovery and utilization;

[0136] η w —the power transmission efficiency of the compressed air station;

[0137] η R —the utilization rate of compressed heat energy recovery;

[0138] E R —the heat recovered and utilized by the compressed air station, in kilowatt-hours (kW·h);

[0139] E j —the electricity consumed by the jth air compressor unit, in kilowatt-hours (kW·h);

[0140] P X —the suction pressure (absolute pressure) of the air compressor, in megapascals (MPa);

[0141] QZ — During the measurement period, the average supply flow rate of the compressed air station (suction state of the air compressor), unit: cubic meters per minute (m 3 / min);

[0142] t— The measurement cycle time, unit: hour (h);

[0143] P Z — The supply pressure of the compressed air station (gauge pressure), unit: megapascal (MPa);

[0144] E Z — During the measurement period, the total electricity consumption of the compressed air station, unit: kilowatt-hour (kW·h).

[0145] B.2.2 When the same system of the compressed air station outputs compressed air with different pressure dew points and different oil content qualities, the dew point correction coefficient (see Table B.1.6) and / or the oil content correction coefficient should be used. After correcting to the same dew point and / or oil content compressed air quality, the energy efficiency grading of the compressed air station should be carried out according to the regulations for the oily grade in Table B.1.1.

[0146] The comprehensive power transmission efficiency is calculated according to Equation (B.2.5):

[0147] η = δ × ∑η i × θ i × m i × n i (B.2.5)

[0148]

[0149] Q Z = ∑Q i (B.2.7)

[0150]

[0151] In the formula:

[0152] η i — The power transmission efficiency of the i-th path of compressed air;

[0153] θ i — The gas volume ratio of the i-th path of compressed air;

[0154] m i — The combined oil correction coefficient of the i-th path of compressed air. When all the configured air compressor units are oil-free machines,

[0155] m i = 1.05; otherwise mi = 1;

[0156] n i—Correction coefficient for the dry dew point of the compressed air in the i-th path, the value is selected according to Table B.1.6;

[0157] P X —Suction pressure of the air compressor (absolute pressure), unit is megapascal (MPa);

[0158] Q i —During the measurement period, the average supply flow rate of the i-th path of compressed air (at the suction state of the air compressor), unit is cubic meters per minute (m 3 / min);

[0159] P Zi —Supply pressure of the i-th path of compressed air station (gauge pressure), unit is megapascal (MPa);

[0160] E i —During the measurement period, the total comprehensive power consumption of the i-th path, unit is kilowatt-hour (kW·h);

[0161] Q Z —During the measurement period, the average supply flow rate of the compressed air station (at the suction state of the air compressor), unit is cubic meters per minute (m 3 / min);

[0162] E Z —During the measurement period, the total power consumption of the compressed air station, unit is kilowatt-hour (kW·h).

[0163] The carbon emission per unit consumption of compressed air in the compressed air station refers to the ratio of the carbon emissions generated during the regular operation of the compressed air station to the amount of compressed air in the compressed air station, and its value is expressed in kgCO 2e / m 3 and is abbreviated as CECA.

[0164] The carbon emission per unit consumption of compressed air in the compressed air station is calculated according to Equation (C.1):

[0165]

[0166] In the formula:

[0167] CECA—Carbon emission per unit consumption of compressed air in the compressed air station, unit is kilograms of carbon dioxide equivalent per cubic meter (kgCO 2e / m 3 );

[0168] D—Power consumption per unit of the compressed air station, unit is kilowatt-hour per cubic meter (kW·h / m 3 );

[0169] E g —During the measurement period, the green power consumption of the compressed air station, unit is kilowatt-hour (kW·h);

[0170] GZ — Measure the total supply of compressed air at the compressed air station during the measurement period, which is the suction state of the air compressor, in cubic meters (m 3 )

[0171] EF - Carbon emission factor of the regional power grid, in kilograms of carbon dioxide equivalent per kilowatt-hour [kgCO 2 / (kW·h)]. In the Shanghai area, it is subject to the information released by the Shanghai Municipal Government every year. In 2023, the carbon emission factor of the Shanghai regional power grid is 0.42 kgCO 2 / (kW·h);

[0172] — Global warming potential of carbon dioxide, with a value of 1.

[0173] When the evaluation score is 15 points, the CECA evaluation index is calculated according to formula (C.1), where E g = 0, and the value of D is looked up in Table C.2 for the electricity consumption per unit corresponding to the corresponding pressure according to the comprehensive work output efficiency corresponding to level 3 energy efficiency in (The non-standard exhaust pressure is converted by linear interpolation).

[0174] When the evaluation score is 25 points, the CECA evaluation index is calculated according to formula (C.1), where E g = 0, and the value of D is looked up in Table C.2 for the electricity consumption per unit corresponding to the corresponding pressure according to the comprehensive work output efficiency corresponding to level 2 energy efficiency in (The non-standard exhaust pressure is converted by linear interpolation).

[0175] When the evaluation score is 35 points, the CECA evaluation index is calculated according to formula (C.1), where E g = 0, and the value of D is looked up in Table C.2 for the electricity consumption per unit corresponding to the corresponding pressure according to the comprehensive work output efficiency corresponding to level 1 energy efficiency in (The non-standard exhaust pressure is converted by linear interpolation).

[0176] Table C.2 Comparison table of work output efficiency and electricity consumption per unit at common pressures

[0177]

[0178]

[0179]

[0180]

[0181] The scoring table for green and low-carbon compressed air stations is shown in Table D.1.

[0182] Table D.1 Scoring table for green and low-carbon compressed air stations

[0183]

[0184] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A green and low-carbon compressed air station evaluation method, characterized in that: The carbon emissions per unit of gas consumption, comprehensive power transmission efficiency, automatic control system, operation and maintenance management and technical application of compressed air stations were evaluated respectively; The evaluation of carbon emissions per unit electricity consumption and comprehensive power transmission efficiency of compressed air stations specifically includes the following steps: Step 1) Calculate the carbon emissions per unit electricity consumption of compressed air stations. The unit is kilowatt-hour per cubic meter (kW h / m 3 ), where E Z —Total electricity consumption of the compressed air station during the measurement period, in kilowatt-hours (kW h), G z —The total amount of compressed air supply at the compressed air station during the measurement period is in the state of air compressor suction, in cubic meters (m 3 ); Step 2) Determine whether the compressed air station outputs compressed air with the same pressure, pressure dew point, and oil content. If so, jump to step 3; if not, jump to step 4; Step 3) Calculate the comprehensive power transmission efficiency of the compressed air station η = δ × η w , δ=1+0.2×η R , Where η is the comprehensive power transmission efficiency of the compressed air station, δ is the correction factor for compression heat recovery, η w —Power transmission efficiency of compressed air station, η R —Compression heat recovery rate, E R —The amount of heat recovered by the compressed air station, in kilowatt-hours (kW h), E j —The amount of electricity consumed by the jth air compressor unit, in kilowatt-hours (kW h), P X —Air compressor suction pressure, in megapascals (MPa), Q Z —The average flow rate of compressed air supply at the compressed air station during the measurement period, in cubic meters per minute (m 3 / min), t—measurement cycle time, in hours (h), P Z —Gas supply pressure of compressed air station, in megapascals (MPa); E Z —The total amount of electricity consumed by the compressed air station during the measurement period, in kilowatt-hours (kW h); Jump to step 5; Step 4) Calculate the comprehensive power transmission efficiency of the compressed air station η = δ × ∑η i ×θ i ×m i ×n i , Q Z =ΣQ i , Where η i —The i-th compressed air transmission efficiency, θ i —The proportion of compressed air volume in the i-th circuit, m i —Correction coefficient of oil content of compressed air in the i-th circuit, when all air compressor units are oil-free, m i =1.05, otherwise m i =1, n i —Correction coefficient of the dry dew point of the i-th compressed air, selected according to Table a, Table a Compressed air drying pressure dew point (PDP) correction factor (%) value table P X —Air compressor suction pressure, in megapascals (MPa), Q i —The average gas flow rate of the i-th gas supply during the measurement period, in cubic meters per minute (m 3 / min), P Zi —The air supply pressure of the i-th compressed air station, in megapascals (MPa), E i —The comprehensive power consumption of the i-th road during the measurement period, in kilowatt-hours (kW h), Q Z —The average flow rate of compressed air supply at the compressed air station during the measurement period, in cubic meters per minute (m 3 / min), E Z —The total amount of electricity consumed by the compressed air station during the measurement period, in kilowatt-hours (kW h); Jump to step 5; Step 5) Calculate the carbon emissions per unit of compressed air station gas consumption Where CECA is the carbon emission per unit of compressed air station gas consumption, in kilograms of carbon dioxide equivalent per cubic meter (kgCO 2e / m 3 ), D—Electricity consumption of compressed air station, in kilowatt-hours per cubic meter (kW·h / m 3 ), E g —Green power consumption of compressed air station during the measurement period, in kilowatt-hours (kW h), G Z —The total amount of compressed air supply at the compressed air station during the measurement period is in the state of air compressor suction, in cubic meters (m 3 ), EF—regional power grid carbon emission factor, in kilograms of carbon dioxide equivalent per kilowatt-hour [kgCO2 / (kW·h)], For example, the carbon emission factor of the Shanghai power grid in 2023 is 0.42kgCO2 / (kW·h). GWP co2 —The global warming potential of carbon dioxide is 1; Step 6) Evaluate the carbon emissions per unit of compressed air station gas consumption CECA, the evaluation criteria are as follows: When the evaluation score is 15 points, Where E g =0, the D value is based on the comprehensive power transmission efficiency corresponding to the three levels of energy efficiency in Tables b to f, and the power consumption corresponding to the corresponding pressure in Table g is substituted; When the evaluation score is 25 points, Where E g =0, the D value is based on the comprehensive power transmission efficiency corresponding to the 2nd level energy efficiency in Table b to Table f, and the power consumption corresponding to the corresponding pressure in Table g is substituted; When the evaluation score is 35 points, Where E g =0, the value of D is based on the comprehensive power transmission efficiency corresponding to the level 1 energy efficiency in Table b to Table f, and the power consumption corresponding to the corresponding pressure in Table g is substituted. Table b Compressed air station energy efficiency level (air supply pressure dew point ≥ 3℃) Table c Compressed air station energy efficiency level (-20℃≤air supply pressure dew point<3℃) Table d Compressed air station energy efficiency level (-40℃≤air supply pressure dew point<-20℃) Table e Compressed air station energy efficiency rating (-70℃≤air supply pressure dew point<-40℃) Table f Compressed air station energy efficiency rating (air supply pressure dew point < -70°C) Table g Comparison table of power transmission efficiency and power consumption per unit at common pressures 2. The green and low-carbon compressed air station evaluation method according to claim 1 is characterized in that: The evaluation of the compressed air station automatic control system includes whether the frequency conversion and optimization control of the air compressor unit or cooling system, automatic loading operation / automatic adjustment of the number of air compressor units, constant pressure control of the compressed air system, automatic fault diagnosis and early warning of the station building, automatic optimization control of the system and intelligent automatic operation of the station building are achieved.

3. The green and low-carbon compressed air station evaluation method according to claim 1 is characterized in that: The evaluation of the operation and maintenance management of the compressed air station includes whether the rules and regulations for the operation and management of the station building are sound, the station building is clean / various signs are clear, regular inspections and regular maintenance are carried out / inspection and maintenance records are kept, independent meters for electricity and gas equipment are complete, energy efficiency assessments or carbon management work is carried out, a digital management system is established, and incentive policies related to employee energy conservation and carbon reduction are formulated.

4. The green and low-carbon compressed air station evaluation method according to claim 1 is characterized in that: The evaluation of compressed air station technology application includes whether to use automatic air flow monitoring system, energy-saving drying and purification technology, energy-saving pipeline valve technology, Internet of Things remote monitoring technology, waste heat recovery measures / energy-saving cooling technology or other energy-saving utilization measures, intelligent green power supply system, gas quality automatic monitoring system, and assembled high-efficiency station building, as well as evaluation of system adjustment of station building and compressed air system.

Images