Plateau natural gas boiler energy efficiency rapid test and diagnosis method

Abstract

The invention discloses a plateau natural gas boiler energy efficiency rapid test and diagnosis method, and relates to the technical field of boiler energy efficiency diagnosis, and the method comprises the steps: obtaining verification data and on-site investigation data; judging whether the boiler has the problem of insufficient output or reduced heat efficiency according to the field operation data of the boiler; when the boiler has the problem of insufficient output, the boiler output heat power is obtained; when the heat efficiency of the boiler is reduced, the boiler heat efficiency is obtained; when the boiler output heat power is smaller than the target heat power, a first fault reason is obtained; when the boiler thermal efficiency is smaller than the target thermal efficiency, obtaining a second fault reason; and determining a processing scheme according to the first fault reason or the second fault reason. According to the invention, the thermal efficiency and the output thermal power of the natural gas fired boiler in the plateau area can be rapidly tested, and a processing scheme is provided for fault reasons of insufficient output or reduced thermal efficiency level of the boiler through testing.

Description

Technical Field

[0001] The invention relates to the technical field of boiler energy efficiency diagnosis, and in particular to a method for rapid energy efficiency testing and diagnosis of a natural gas boiler in a plateau. Background Art

[0002] Compared with plains, plateaus have the characteristics of high altitude, low air pressure, and low oxygen content. When gas boilers are operated in plateaus, the low ambient air pressure often leads to increased flame size, increased smoke and wind resistance, weakened radiation heat transfer, and increased exhaust temperature, which often cause the boilers to have problems such as insufficient output and reduced thermal efficiency. The existing gas boiler energy efficiency testing and diagnosis methods do not take into account the particularity of plateaus, and cannot quickly and effectively evaluate the energy efficiency of plateau natural gas boilers, and thus cannot provide specific treatment plans. Summary of the invention

[0003] The purpose of the present invention is to provide a method for rapid testing and diagnosis of the energy efficiency of natural gas boilers in plateau areas, which can quickly test the thermal efficiency and output thermal power of natural gas boilers in plateau areas, and propose treatment plans for the causes of boiler failures such as insufficient output or reduced thermal efficiency levels through testing.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a method for rapid testing and diagnosis of energy efficiency of a highland natural gas boiler, the method comprising:

[0006] Obtain verification information and on-site investigation data; the verification information includes: boiler design, manufacturing, installation and use management information.

[0007] Based on the data of boiler on-site operation, it is judged whether the boiler’s current status has problems such as insufficient output or reduced thermal efficiency.

[0008] When the boiler has an output problem of insufficient in the current state, the boiler output thermal power is obtained; the boiler output thermal power is the thermal power obtained by performing a maximum thermal power test on the boiler.

[0009] When the current state of the boiler is that the thermal efficiency decreases, the thermal efficiency of the boiler is obtained; the thermal efficiency of the boiler is the thermal efficiency obtained by performing a quick thermal efficiency test on the boiler.

[0010] When the boiler output thermal power is less than the target thermal power, a first fault cause is obtained; the first fault cause includes: the flame scours the inner wall of the combustion chamber and the burner, fan and motor are not corrected according to the altitude of the use site.

[0011] When the boiler thermal efficiency is less than the target thermal efficiency, a second fault cause is obtained; the second fault cause includes: high boiler exhaust temperature, high oxygen content at the exhaust, high carbon monoxide content at the exhaust, and high boiler outer surface temperature.

[0012] A processing plan is determined according to the first fault cause or the second fault cause.

[0013] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0014] The present invention provides a method for rapid testing and diagnosis of energy efficiency of natural gas boilers in plateaus. By obtaining verification information and on-site investigation data, it is possible to determine whether the thermal calculation of the boiler and the calculation of smoke and wind resistance have been corrected according to the altitude, whether the matching burners, fans, etc. have been selected according to the altitude, and understand the basic conditions of boiler use and the faults and problems existing in operation; based on the data of the on-site operation of the boiler, it is determined whether the current state of the boiler has the problem of insufficient output or reduced thermal efficiency; when the current state of the boiler has the problem of insufficient output, the boiler output thermal power is obtained; the boiler output thermal power is the thermal power obtained by performing a maximum thermal power test on the boiler; when the boiler When the current state is that the thermal efficiency decreases, the thermal efficiency of the boiler is obtained; the thermal efficiency of the boiler is the thermal efficiency obtained by quickly testing the thermal efficiency of the boiler; when the thermal power output of the boiler is less than the target thermal power, the first fault cause is obtained; the first fault cause includes: the flame scours the inner wall of the combustion chamber and the burner, fan and motor are not corrected according to the altitude of the use site; when the thermal efficiency of the boiler is less than the target thermal efficiency, the second fault cause is obtained; the second fault cause includes: the boiler exhaust temperature is high, the oxygen content at the exhaust is high, the carbon monoxide content at the exhaust is high, and the temperature of the outer surface of the boiler is high; according to the first fault cause or the second fault cause, a treatment plan is determined. The present invention can quickly test the thermal efficiency and thermal power output of natural gas-fired boilers in plateau areas, and propose a treatment plan for the fault causes of insufficient output or reduced thermal efficiency levels of the boiler through testing. On the basis of technical and economic evaluation, measures such as repair, transformation, combustion adjustment, and operation optimization can be taken to improve boiler performance and achieve energy efficiency goals. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1This is an application environment diagram of a method for rapid energy efficiency testing and diagnosis of high-altitude natural gas boilers in one embodiment of the present invention.

[0017] Figure 2 A flowchart of a method for rapid testing and diagnosing energy efficiency of a high-altitude natural gas boiler provided in accordance with an embodiment of the present invention.

[0018] Figure 3 A technical roadmap for rapid testing and diagnosis of energy efficiency of high-altitude natural gas boilers provided in accordance with an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The highland natural gas boiler energy efficiency rapid testing and diagnosis method provided by the embodiment of the present invention can be applied to Figure 1In the application environment shown. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store the data that the server 104 needs to process. The data storage system can be set up separately, integrated on the server 104, or placed on the cloud or other servers. The terminal 102 can send verification information and field investigation data to the server 104, and the verification information includes: design, manufacturing, installation and use management information of the boiler; after the server 104 receives the verification information and field investigation data, for the verification information and field investigation data, the server 104 is based on the verification information and field investigation data; according to the data of the on-site operation of the boiler, it is judged whether the current state of the boiler has the problem of insufficient output or reduced thermal efficiency; when the current state of the boiler has the problem of insufficient output, the boiler output thermal power is obtained; the boiler output thermal power is the thermal power obtained by testing the boiler with the maximum thermal power; when the current state of the boiler When the thermal efficiency decreases, the thermal efficiency of the boiler is obtained; the thermal efficiency of the boiler is the thermal efficiency obtained by performing a rapid test on the thermal efficiency of the boiler; when the thermal power output of the boiler is less than the target thermal power, the first fault cause is obtained; the first fault cause includes: the flame scours the inner wall of the combustion chamber and the burner, fan and motor are not corrected according to the altitude of the use site; when the thermal efficiency of the boiler is less than the target thermal efficiency, the second fault cause is obtained; the second fault cause includes: the boiler exhaust temperature is high, the oxygen content at the exhaust is high, the carbon monoxide content at the exhaust is high, and the temperature of the outer surface of the boiler is high; according to the first fault cause or the second fault cause, a treatment plan is determined. The server 104 can feedback the obtained treatment plan to the terminal 102. In addition, in some embodiments, the plateau natural gas boiler energy efficiency rapid test and diagnosis method can also be implemented by the server 104 or the terminal 102 alone, such as the terminal 102 can directly perform rapid test and diagnosis on the verification data and field investigation data, or the server 104 can obtain the verification data and field investigation data from the data storage system, and perform rapid test and diagnosis on the verification data and field investigation data.

[0022] The terminal 102 may be, but is not limited to, various desktop computers, laptop computers, smart phones, and tablet computers. The server 104 may be implemented as an independent server or a server cluster consisting of multiple servers, or may be a cloud server.

[0023] In an exemplary embodiment, Figure 2 As shown, a method for rapid testing and diagnosis of energy efficiency of highland natural gas boilers is provided. The method is executed by a computer device, and can be executed by a computer device such as a terminal or a server alone, or by a terminal and a server together. In an embodiment of the present invention, the method is applied to Figure 1 The server 104 in the example is used for explanation, and the steps include the following steps S1 to S7.

[0024] in:

[0025] S1: Obtain verification information and on-site investigation data; the verification information includes: boiler design, manufacturing, installation and use management information.

[0026] S2: Determine whether the boiler is under-powered or has reduced thermal efficiency based on the on-site operation data of the boiler.

[0027] S3: When the boiler has an output problem of insufficient in the current state, the boiler output thermal power is obtained; the boiler output thermal power is the thermal power obtained by performing a maximum thermal power test on the boiler.

[0028] S4: when the current state of the boiler is that the thermal efficiency decreases, the thermal efficiency of the boiler is obtained; the thermal efficiency of the boiler is the thermal efficiency obtained by performing a quick thermal efficiency test on the boiler.

[0029] S5: When the thermal power output of the boiler is less than the target thermal power, a first fault cause is obtained; the first fault cause includes: the flame scours the inner wall of the combustion chamber and the burner, fan and motor are not corrected according to the altitude of the use site.

[0030] S6: When the boiler thermal efficiency is less than the target thermal efficiency, a second fault cause is obtained; the second fault cause includes: high boiler exhaust temperature, high oxygen content at the exhaust, high carbon monoxide content at the exhaust, and high boiler outer surface temperature.

[0031] S7: Determine a processing solution according to the first fault cause or the second fault cause.

[0032] By implementing the above-mentioned steps S1 to S7, the present invention can quickly test the thermal efficiency and output thermal power of natural gas-fired boilers in plateau areas, and propose treatment plans for the causes of boiler failures such as insufficient output or reduced thermal efficiency levels through testing. On the basis of technical and economic evaluations, measures such as repairs, modifications, combustion adjustments, and operation optimization can be taken to improve boiler performance and achieve energy efficiency goals.

[0033] In an exemplary embodiment, in step S3, it specifically includes:

[0034] S31: Determine boiler operating parameters and inlet cold air temperature; the boiler operating parameters include: working fluid outlet pressure, working fluid outlet temperature, drum water level, and heating surface wall temperature of medium-pressure and above steam boilers.

[0035] S32: Record the boiler combustion status and combustion results according to the boiler operating parameters and the cold air temperature entering the furnace; the combustion results include: fuel consumption, boiler exhaust temperature, oxygen content and carbon monoxide content at the exhaust.

[0036] The boiler output thermal power is calculated based on the combustion result.

[0037] The calculation formula of the boiler output thermal power is:

[0038]

[0039] η=100-q2-q3-q5 (2);

[0040]

[0041] Among them, Q out is the boiler output thermal power, in MW; Q net.ar The received low calorific value of the gas, in kJ / m 3 ; B is fuel consumption, unit is m 3 / h; η is the thermal efficiency of the boiler, in %; q2 is the heat loss of flue gas, in %; q3 is the heat loss of incomplete combustion of gas, in %; q5 is the heat loss, in %; t ds is the exhaust gas temperature, in °C; t ca is the cold air temperature, in °C; α is the excess air coefficient; O2' is the volume content of oxygen in the dry flue gas, in %; CO' is the volume content of carbon monoxide in the dry flue gas, in %; F is the outer surface area of ​​the boiler, in m 2 ;P a It is the atmospheric pressure used by the boiler, in Pa.

[0042] In an exemplary embodiment, in step S4, it specifically includes:

[0043] S41: When the boiler is in a stable operating state, the temperature of cold air entering the boiler and the combustion result are obtained; the combustion result includes: fuel consumption, boiler exhaust temperature, oxygen content and carbon monoxide content at the exhaust;

[0044] S42: Calculate the boiler thermal efficiency according to the inlet cold air temperature and the boiler outer surface temperature.

[0045] The calculation formula for boiler thermal efficiency is shown in formula (2) to formula (6).

[0046] In an exemplary embodiment, in step S7, it specifically includes:

[0047] S71: When the first fault cause is the flame scouring the inner wall of the combustion chamber, a solution is generated to correct the boiler body design according to the altitude of the use site.

[0048] S72: When the first fault cause is that the burner, fan and motor are not corrected according to the altitude of the use site, a solution is generated to correct the boiler smoke wind resistance, air volume, burner rated output power and motor power according to the altitude conditions of the use site.

[0049] S73: When the second fault cause is high boiler exhaust temperature, a solution is generated to correct the furnace radiation heat exchange calculation according to the altitude of the use site, and to clean the scaling and ash accumulation on the boiler heating surface.

[0050] S74: When the second fault cause is high oxygen content at the exhaust, a plan is generated to check whether the gas supply system, the supplier adjustment system, and the oxygen content monitoring instrument are abnormal and to adjust the air-fuel ratio of the burner.

[0051] S75: When the second fault cause is high carbon monoxide content at the exhaust, a plan is generated to check whether the burner combustion head, air filter, gas supply system, air supply adjustment system and oxygen content monitoring instrument are abnormal and to adjust the burner air-fuel ratio.

[0052] S76: When the second fault cause is high temperature of the outer surface of the boiler, a plan for repairing the insulation structure of the overheated part of the boiler is generated.

[0053] In another exemplary embodiment of the present invention, the technical roadmap of the plateau gas boiler energy efficiency diagnosis method is as follows: Figure 3 As shown, the specific steps include:

[0054] A1. Data verification.

[0055] A11: Check the boiler factory information, including the boiler general drawing, boiler manual, thermal calculation sheet or thermal calculation result summary sheet, smoke and wind resistance calculation sheet or calculation result summary sheet, boiler product energy efficiency test report, etc.

[0056] A12: Check the completion data of boiler installation (including commissioning) and repair and modification data.

[0057] A13: Check the boiler usage management information, including boiler regular energy efficiency test reports, water (medium) quality inspection reports or records, daily energy-saving inspection records, accident and failure records, etc.

[0058] A14: Check the boiler supervisory inspection and periodic inspection reports.

[0059] By consulting materials and collecting basic information and relevant data on boilers and auxiliary equipment, we can determine whether the boiler thermal calculations and smoke and wind resistance calculations have been corrected according to the altitude, whether the matching burners, fans, etc. have been selected according to the altitude, and understand the basic conditions of boiler use and any faults and problems that exist during operation.

[0060] A2. On-site investigation.

[0061] A21: Confirm whether the main structure of the boiler and the layout of the main heating surfaces are consistent with the design or modification data.

[0062] A22: Confirm whether the models and parameters of the burner, fan and corresponding motor equipped with the boiler are consistent with the design or modification data.

[0063] A23: Check whether the main and auxiliary equipment of the boiler are running normally, and whether there are any leakages. Observe whether the combustion is normal through the fire viewing hole, and whether there are any flames scouring the inner wall of the combustion chamber.

[0064] A24: Find out whether the boiler has insufficient output or reduced thermal efficiency.

[0065] A3. Determine energy efficiency targets.

[0066] A31: Target thermal power. Usually the rated thermal power of the boiler is used, and it can also be determined by the boiler user based on the maximum heat load demand. The rated thermal power of a steam boiler refers to the heat output per unit time of the boiler when the rated evaporation capacity, rated steam parameters, rated feed water temperature, and the design fuel are used. It can be calculated through the design parameters.

[0067] A32: Target thermal efficiency. Usually the most recent thermal efficiency test result is used (the exhaust temperature, oxygen content and carbon monoxide content at the exhaust in the test result are used as the target values ​​of the corresponding parameters). It can also be determined by the boiler user based on the design thermal efficiency or the thermal efficiency test results of the boiler product (the exhaust temperature, oxygen content and carbon monoxide content at the exhaust in the design documents or test results are used as the target values ​​of the corresponding parameters).

[0068] A4. Field test.

[0069] A41: Maximum thermal power test.

[0070] After reviewing the data and conducting on-site investigation, if it is determined that the boiler may have insufficient output, a maximum thermal power test should be conducted. The main test steps are as follows:

[0071] A4101: Under normal operating conditions of the boiler's main and auxiliary equipment, gradually increase the burner output so that the boiler's thermal load continues to increase until the boiler's rated evaporation capacity or rated thermal power is reached.

[0072] A4102: During the test, monitor the main operating parameters of the boiler (working fluid outlet pressure, working fluid outlet temperature, drum water level, heating surface wall temperature of medium-pressure and above steam boilers, etc.) to ensure that they do not exceed the allowable range; for hot water boilers, the test process should ensure that the outlet water temperature is at least 20°C lower than the saturation temperature at that pressure;

[0073] A4103: Monitor the boiler exhaust temperature, oxygen content and carbon monoxide content at the exhaust, and observe the boiler combustion status through the fire viewing hole at any time.

[0074] A4104: When the burner output reaches the maximum, maintain the maximum output state and run stably for 1 hour, record the fuel consumption, boiler exhaust temperature, oxygen content and carbon monoxide content at the exhaust, and measure the temperature of the cold air entering the furnace.

[0075] A4105: If the flame scours the inner wall of the combustion chamber during the test, the burner output should be reduced until the flame has no contact with the inner wall of the combustion chamber. After maintaining this operating state for 1 hour, record the fuel consumption, boiler exhaust temperature, oxygen content and carbon monoxide content at the exhaust, and measure the temperature of the cold air entering the furnace.

[0076] A4106: Use formula (1) to quickly calculate the boiler output thermal power. When the boiler output thermal power is less than the boiler target thermal power, it is determined that the boiler output is insufficient.

[0077] A42: Thermal efficiency quick test.

[0078] When the boiler is in stable operation, the boiler thermal efficiency can be quickly calculated by measuring the cold air temperature entering the boiler, the exhaust gas temperature, the oxygen content and carbon monoxide content at the exhaust gas, and the boiler outer surface temperature. The main test steps are as follows:

[0079] A4201: Check that there is no obvious leakage in the boiler and that the main and auxiliary machines are operating normally.

[0080] A4202: The test load is generally selected from the boiler load of the last thermal efficiency test, and can also be carried out under the boiler's normal load.

[0081] A4203: The test should be carried out after stable operation under the test load conditions for at least 1 hour, and the test duration should be at least 0.5 hours.

[0082] A4204: During the test, the fluctuation range of the main parameters of the boiler should comply with the requirements of Table 1; for hot water boilers, the pressure should ensure that the outlet water temperature is at least 20°C lower than the saturation temperature at that pressure.

[0083] A4205: The safety valve should not trip during the test, and any operations that interfere with the test conditions, such as regular and continuous blowdown, are not allowed.

[0084] A4206: According to the structural characteristics of the boiler, the outer surface of the boiler body and components is divided into several sections, and the outer surface temperature of each section of the boiler is measured by an infrared thermometer, with no less than 2 measuring points in each section. If the difference between the outer surface temperature of the boiler body 300mm away from the door hole and the ambient temperature does not exceed 25°C, and the difference between the outer surface temperature of the furnace top and the ambient temperature does not exceed 50°C, then the boiler insulation performance is judged to meet the requirements. On the contrary, when the measured outer surface temperature does not meet the above requirements, the insulation structure of the overheated part of the boiler should be repaired, and the re-measurement after repair should meet the requirements. At this time, the outer surface temperature of the boiler does not affect the subsequent calculation of the thermal efficiency of the boiler.

[0085] A4207: Measure the cold air temperature entering the boiler, the exhaust gas temperature, the oxygen content and the carbon monoxide content at the exhaust gas. The measurement time interval of each parameter shall not exceed 10 minutes, and the number of measurements shall not be less than 3 times. The arithmetic mean value of each parameter is used to quickly calculate the boiler thermal efficiency through formula (2)-formula (6).

[0086] Table 1 Permissible deviation range of main parameters of boiler

[0087]

[0088] A5. Energy efficiency analysis and diagnosis.

[0089] Through data verification, on-site investigation and on-site testing, the test results are compared with the target thermal power and target thermal efficiency of the boiler. When the boiler has insufficient output and reduced thermal efficiency, the cause of the failure should be analyzed and a treatment plan should be proposed. On the basis of technical and economic evaluation, measures such as repair, transformation, combustion adjustment, and operation optimization should be taken to improve boiler performance and achieve energy efficiency goals. The main causes and treatment measures for insufficient boiler output and reduced thermal efficiency are as follows.

[0090] A51: The boiler thermal power does not reach the target thermal power.

[0091] A5101: The flame scours the inner wall of the combustion chamber.

[0092] The boiler body design was not corrected according to the altitude of the place of use, and did not take into account the elongation of the burner flame caused by the decrease in air pressure due to the increase in altitude. The burner should be adjusted to shorten the flame length; the burner should be re-selected, and the burner with a flame size that is suitable for the combustion chamber should be selected; the boiler output should be reduced according to the measured maximum thermal power as the upper limit to ensure that the flame does not scour the inner wall of the combustion chamber.

[0093] A5102: The burner, fan and motor are not corrected according to the altitude of the place of use.

[0094] Check the boiler smoke and wind resistance calculation book or summary table and the technical data of the burner, fan, and motor, and recalculate the boiler smoke and wind resistance, air volume, and motor power according to the altitude conditions of the place of use. The boiler smoke and wind system resistance can be corrected according to 11.10.2 of DL / T5240, the air volume can be multiplied by for correction, and the burner rated output power can be multiplied by for correction. Check and calculate the motor according to formula (7). When the ambient temperature meets formula (7), the rated output power of the motor does not need to be corrected. When formula (7) is not met, the rated output power of the motor should be reduced, and the rated power reduction value is calculated according to formula (8).

[0095] (h-1000)Δi≤40-t at (7);

[0096]

[0097] Wherein, h is the altitude of the motor in meters; t at is the ambient temperature of the motor use location, in °C; Δi is the maximum ambient temperature compensation value required for each 100m increase in altitude within the range of 1000-5000m, where Δi=0.01×motor winding temperature rise limit / 100, in °C / m; Ne is the motor rated power, in kW; ΔNe is the motor rated power reduction value, in kW.

[0098] A52: The boiler thermal efficiency does not reach the target thermal efficiency.

[0099] A5201: The boiler exhaust temperature is high.

[0100] A52011: The boiler heating surface is not designed properly.

[0101] Check the boiler thermal calculation book or thermal calculation summary table and boiler drawings to confirm whether the furnace radiation heat transfer calculation has been modified according to the altitude of the place of use. If not, the tail heating surface can be increased under the condition of meeting the safe operation of the boiler to reduce the exhaust gas temperature. When designing and calculating the tail heating surface, the flue gas side convection heat transfer coefficient does not need to be corrected for the altitude.

[0102] A52012: Scaling on boiler heating surfaces.

[0103] Check the boiler water quality inspection report or record. If the boiler water quality does not meet the requirements of GB / T 1576 "Industrial Boiler Water Quality" or GB / T 12145, water treatment management should be strengthened to ensure that the water vapor quality meets the standard requirements. At the same time, the scale volume and scale sample analysis report or record should be checked. If necessary, check the scale condition on the medium side and perform chemical cleaning according to the scaling condition to reduce the exhaust gas temperature.

[0104] A52013: Dust on the boiler heating surface.

[0105] When the thermal efficiency rapid test shows that the carbon monoxide emission concentration at the exhaust is higher than 300mg / m 3 (The base oxidation amount is 3.5%), and the boiler heating surface should be checked for obvious ash accumulation in combination with the boiler's historical operation. If the ash accumulation is serious, it should be removed in time to improve the heat exchange capacity of the flue gas side and reduce the flue gas temperature. The measured carbon monoxide emission concentration and volume content at the flue gas exhaust are converted according to formula (9), and then converted to the carbon monoxide emission concentration under the base oxygen content conditions according to formula (10).

[0106] ρ CO =12500×CO' (9);

[0107]

[0108] Among them, ρ CO is the measured emission concentration of carbon monoxide, in mg / m 3 ; ρ' CO is the carbon monoxide baseline oxygen content emission concentration, in mg / m 3 .

[0109] A5202: The oxygen content at the smoke exhaust is high.

[0110] When the oxygen content at the exhaust is higher than the target oxygen content value, check whether there are any abnormalities in the gas supply system and the supplier's regulation system. If there is any problem, repair it; compare the measured oxygen content with the boiler oxygen content monitoring value. If there is an obvious deviation, replace the oxygen content monitoring instrument; adjust the burner air-fuel ratio, and monitor the carbon monoxide emission concentration to ensure that it does not exceed the target carbon monoxide value to minimize exhaust heat loss.

[0111] A5203: The carbon monoxide content at the exhaust is high.

[0112] If the carbon monoxide content at the exhaust is higher than the target value, check whether the burner head is damaged, whether the air filter is blocked, whether the gas supply system and air supply adjustment system are abnormal, and repair them if there are any problems; compare the measured oxygen content with the measured value of the boiler oxygen content monitoring instrument. If there is a significant deviation, replace the oxygen content monitoring instrument; adjust the air-fuel ratio of the burner so that the carbon monoxide content at the exhaust does not exceed the target value. When the target value of carbon monoxide content at the exhaust cannot be obtained through historical data, the target value can be 300mg / m 3 (Baseline oxidation amount is 3.5%).

[0113] A5204: The boiler outer surface temperature is high.

[0114] The difference between the outer surface temperature of the boiler body 300mm away from the door hole and the ambient temperature shall not exceed 25℃, and the difference between the outer surface temperature of the furnace top and the ambient temperature shall not exceed 50℃. When the measured outer surface temperature of the boiler exceeds the above range, the insulation structure of the over-temperature part of the boiler shall be repaired, and the outer surface temperature measured again after repair shall meet the above requirements.

[0115] The present invention can quickly test the thermal efficiency and output power of natural gas-fired boilers in plateau areas, and propose treatment plans for the causes of boiler failures such as insufficient output and reduced thermal efficiency levels through testing. On the basis of technical and economic evaluation, measures such as repair, transformation, combustion adjustment, and operation optimization can be taken to improve boiler performance and achieve energy efficiency goals.

[0116] The present invention also provides an application scenario, which applies the above-mentioned highland natural gas boiler energy efficiency rapid testing and diagnosis method. Specifically: The highland natural gas boiler energy efficiency rapid testing and diagnosis method provided in this embodiment can be applied in the boiler energy efficiency testing and diagnosis scenario. The boiler energy efficiency testing and diagnosis scenario includes: data acquisition link, fault judgment link, fault cause acquisition link and treatment plan determination link; obtaining verification information and on-site investigation data; the verification information includes: boiler design, manufacturing, installation and use management information; judging whether the current state of the boiler has insufficient output or reduced thermal efficiency based on the data of the on-site operation of the boiler; when the current state of the boiler has insufficient output, obtaining the boiler output thermal power; the boiler output thermal power is the thermal power obtained by testing the boiler at the maximum thermal power; when the current state of the boiler is a reduced thermal efficiency, obtaining the boiler thermal power. efficiency; the boiler thermal efficiency is the thermal efficiency obtained by performing a quick test on the thermal efficiency of the boiler; when the thermal power output of the boiler is less than the target thermal power, a first fault cause is obtained; the first fault cause includes: the flame scours the inner wall of the combustion chamber and the burner, fan and motor are not corrected according to the altitude of the place of use; when the boiler thermal efficiency is less than the target thermal efficiency, a second fault cause is obtained; the second fault cause includes: high boiler exhaust temperature, high oxygen content at the exhaust, high carbon monoxide content at the exhaust and high boiler outer surface temperature; according to the first fault cause or the second fault cause, a treatment plan can be determined.

[0117] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0118] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for rapid testing and diagnosis of energy efficiency of natural gas boilers in plateaus, characterized in that: The highland natural gas boiler energy efficiency rapid testing and diagnosis method comprises: Obtain verification information and on-site investigation data; the verification information includes: boiler design, manufacturing, installation and use management information; Based on the on-site operation data of the boiler, determine whether the boiler is currently in a state of insufficient output or reduced thermal efficiency; When the boiler has an output problem of insufficient power in the current state, the boiler output thermal power is obtained; the boiler output thermal power is the thermal power obtained by performing a maximum thermal power test on the boiler; When the current state of the boiler is that the thermal efficiency decreases, the thermal efficiency of the boiler is obtained; the thermal efficiency of the boiler is the thermal efficiency obtained by performing a quick thermal efficiency test on the boiler; When the boiler output thermal power is less than the target thermal power, a first fault cause is obtained; the first fault cause includes: the flame scours the inner wall of the combustion chamber and the burner, fan and motor are not corrected according to the altitude of the use site; When the boiler thermal efficiency is less than the target thermal efficiency, a second fault cause is obtained; the second fault cause includes: high boiler exhaust temperature, high oxygen content at the exhaust, high carbon monoxide content at the exhaust, and high boiler outer surface temperature; A processing plan is determined according to the first fault cause or the second fault cause.

2. The highland natural gas boiler energy efficiency rapid testing and diagnosis method according to claim 1 is characterized in that: When the boiler has insufficient output in its current state, the output thermal power of the boiler is obtained, specifically including: Determine boiler operating parameters and inlet cold air temperature; the boiler operating parameters include: working fluid outlet pressure, working fluid outlet temperature, drum water level, heating surface wall temperature of medium pressure and above pressure steam boilers; Record the boiler combustion status and combustion results according to the boiler operating parameters and the cold air temperature entering the furnace; the combustion results include: fuel consumption, boiler exhaust temperature, oxygen content and carbon monoxide content at the exhaust; The boiler output thermal power is calculated based on the combustion result.

3. The highland natural gas boiler energy efficiency rapid testing and diagnosis method according to claim 1 is characterized in that: The calculation formula of the boiler output thermal power is: η=100-q2-q3-q5; Among them, Q out is the boiler output thermal power, in MW; Q net.ar The received low calorific value of the gas, in kJ / m 3 ; B is fuel consumption, unit is m 3 / h; η is the boiler thermal efficiency, in %; q2 is the exhaust heat loss, in %; q3 is the incomplete combustion heat loss of gas, in %; q5 is the heat loss, in %; t ds is the exhaust gas temperature, in °C; t ca is the cold air temperature, in °C; α is the excess air coefficient; O2' is the volume content of oxygen in the dry flue gas, in %; CO' is the volume content of carbon monoxide in the dry flue gas, in %; F is the outer surface area of ​​the boiler, in m 2 ;P a It is the atmospheric pressure used by the boiler, in Pa.

4. The highland natural gas boiler energy efficiency rapid testing and diagnosis method according to claim 1 is characterized in that: When the current state of the boiler is that the thermal efficiency decreases, the thermal efficiency of the boiler is obtained, specifically including: When the boiler is in a stable operating state, the temperature of the cold air entering the boiler and the combustion results are obtained; the combustion results include: fuel consumption, boiler exhaust temperature, oxygen content and carbon monoxide content at the exhaust; The boiler thermal efficiency is calculated based on the inlet cold air temperature and the boiler outer surface temperature.

5. The highland natural gas boiler energy efficiency rapid testing and diagnosis method according to claim 1 is characterized in that: The calculation formula of the boiler thermal efficiency is: η=100-q2-q3-q5; Wherein, η is the thermal efficiency of the boiler, in %; q2 is the heat loss of flue gas, in %; q3 is the heat loss of incomplete combustion of gas, in %; q5 is the heat loss, in %; t ds is the exhaust gas temperature, in °C; t ca is the cold air temperature, in °C; α is the excess air coefficient; O2' is the volume content of oxygen in the dry flue gas, in %; CO' is the volume content of carbon monoxide in the dry flue gas, in %; Q net.ar The received low calorific value of the gas, in kJ / m 3 ; B is fuel consumption, unit is m 3 / h; F is the outer surface area of ​​the boiler, in m 2 ;P a It is the atmospheric pressure used by the boiler, in Pa.

6. The highland natural gas boiler energy efficiency rapid testing and diagnosis method according to claim 1 is characterized in that: Determine a solution according to the first fault cause or the second fault cause, specifically including: When the first fault cause is that the flame scours the inner wall of the combustion chamber, a solution is generated to correct the design of the boiler body according to the altitude of the place of use; When the first fault cause is that the burner, fan and motor are not corrected according to the altitude of the place of use, a solution is generated to correct the boiler smoke wind resistance, air volume, burner rated output power and motor power according to the altitude conditions of the place of use; When the second fault cause is high boiler exhaust gas temperature, a solution is generated to correct the furnace radiation heat exchange calculation according to the altitude of the use site, and to clean the scaling and ash accumulation on the boiler heating surface; When the second fault cause is high oxygen content at the smoke exhaust, a plan is generated to check whether the gas supply system, the supplier adjustment system, and the oxygen content monitoring instrument are abnormal and to adjust the air-fuel ratio of the burner; When the second fault cause is high carbon monoxide content at the exhaust, a plan is generated to check whether the burner head, air filter, gas supply system, air supply adjustment system and oxygen content monitoring instrument are abnormal and to adjust the air-fuel ratio of the burner; When the second fault cause is that the temperature of the outer surface of the boiler is high, a plan is generated to repair the insulation structure of the over-temperature part of the boiler.

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