Boiler condenser thermal efficiency calculation method and system based on condensation rate calculation

Abstract

The application discloses a boiler condenser thermal efficiency calculation method and system based on condensation rate calculation, and belongs to the field of boiler energy efficiency testing. The method comprises the following steps: obtaining the first flue gas temperature and the first relative humidity at the entrance of the condenser, and the second flue gas temperature and the second relative humidity at the exit of the condenser; determining the water vapor condensation rate when the flue gas passes through the condenser; obtaining fuel characteristic parameters, at least including the low calorific value of fuel and the water vapor amount generated by hydrogen combustion in fuel; and calculating the thermal efficiency of the condenser based on the above water vapor condensation rate, the low calorific value of fuel and the water vapor amount. The application can quickly and accurately calculate the thermal efficiency of the condenser by measuring the temperature and relative humidity of the flue gas before and after the condenser, combining the fuel characteristic parameters, without measuring complex parameters such as flue gas composition, flue gas flow, cooling water flow and cooling water temperature, and has the advantages of less measurement parameters, simple calculation, low equipment cost and real-time online monitoring.

Description

Technical Field

[0001] This invention relates to the field of condensing thermal efficiency calculation technology for fluid fuel boilers, and in particular to a method and system for calculating the thermal efficiency of boiler condensers based on condensation rate calculation. Background Technology

[0002] In industrial production and residential life, boiler thermal efficiency is a key factor affecting energy consumption levels and operational economy. Among them, condensing boilers, by recovering latent heat from flue gas, have significantly higher thermal efficiency than traditional boilers, and are therefore increasingly widely used.

[0003] As the core component for achieving efficient heat recovery in condensing boilers, the accurate calculation of the condenser's thermal efficiency is an indispensable step in evaluating the overall boiler thermal efficiency. Currently, the industry primarily relies on existing standard methods for calculating the thermal efficiency of condensers and boilers, such as: The standard NB / T 47066-2018 "Test Methods for Thermal Performance of Condensing Boilers" uses the heat loss method for determination. The standard GB / T 10180-2017 "Test Procedure for Thermal Performance of Industrial Boilers" uses the input-output heat method for determination.

[0004] However, these traditional standard testing methods have the following significant drawbacks in practical applications: 1. Numerous measurement parameters: Multiple parameters such as flue gas temperature, working fluid flow rate, inlet and outlet water temperature, and flue gas composition need to be collected simultaneously, which places high demands on the complexity of the testing system and the cost of equipment.

[0005] 2. Complex calculation process: It relies on complex heat transfer models and tedious iterative calculations, which not only easily introduces human error, but also requires a high level of professional competence from the testers.

[0006] 3. Poor real-time performance: The complete testing and calculation cycle is long, making it impossible to respond quickly to changes in operating conditions and difficult to achieve real-time monitoring and evaluation of the thermal efficiency of condensers and boilers.

[0007] 4. High equipment and maintenance costs: It relies on high-precision sensors and complex installation and debugging, making on-site implementation difficult and maintenance costs high.

[0008] Therefore, the existing technology lacks a method for calculating condenser thermal efficiency that can simplify measurement, quickly calculate, and provide real-time feedback. This has become a technical bottleneck restricting the refined management and timely optimization of boiler energy efficiency. Summary of the Invention

[0009] Therefore, the purpose of this invention is to provide a method and system for calculating the thermal efficiency of a boiler condenser based on condensation rate. By significantly reducing the number of required measurement parameters and simplifying the calculation process, the thermal efficiency of a condensing boiler can be calculated while ensuring accuracy in engineering applications. Specifically, it aims to achieve the following objectives: 1. Improved calculation efficiency: It can quickly calculate the thermal efficiency of the condenser, significantly shortening the evaluation time.

[0010] 2. Lower the implementation threshold: Reduce reliance on high-precision, multi-type sensors, and reduce the complexity and cost of testing equipment.

[0011] 3. Enhanced real-time performance: Enables near real-time assessment and monitoring of the thermal efficiency of condensers and boilers, facilitating timely understanding of energy efficiency levels by operators.

[0012] 4. Enhance practicality: Provide a simple and reliable testing solution that can be easily promoted and applied in on-site inspection, daily monitoring and other scenarios.

[0013] To achieve the above objectives, the present invention provides a method for calculating the thermal efficiency of a boiler condenser based on condensation rate, comprising the following steps: S1. Obtain the first flue gas temperature and the first relative humidity at the condenser inlet, and the second flue gas temperature and the second relative humidity at the condenser outlet; S2. Based on the first flue gas temperature and the first relative humidity, determine the first flue gas moisture content at the condenser inlet; based on the second flue gas temperature and the second relative humidity, determine the second flue gas moisture content at the condenser outlet; based on the first flue gas moisture content and the second flue gas moisture content, determine the water vapor condensation rate of the flue gas as it passes through the condenser. S3. Obtain fuel characteristic parameters; the fuel characteristic parameters include at least the lower heating value of the fuel and the amount of water vapor produced by hydrogen combustion per cubic meter of fuel; S4. The thermal efficiency of the condenser is calculated based solely on the water vapor condensation rate, the lower heating value of the fuel, and the amount of water vapor generated by the combustion of hydrogen.

[0014] More preferably, in S2, the water vapor condensation rate is calculated based on the moisture content of the first flue gas and the moisture content of the second flue gas according to the following formula: in, For water vapor condensation rate, The first moisture content of the flue gas. This refers to the moisture content of the second flue gas.

[0015] More preferably, the moisture content of the first flue gas and the moisture content of the second flue gas are both calculated using the following formula: in, Indicates the moisture content of flue gas. P represents the mass of water vapor contained in one kilogram of dry flue gas. st.Sat.ti This represents the water vapor saturation pressure corresponding to the flue gas temperature, in kPa. Atmospheric pressure, unit: kPa.

[0016] More preferably, the water vapor saturation pressure P corresponding to the flue gas temperature st.Sat.ti The following fitting formula was used to calculate: P st.Sat.ti = 0.000789T i 3 - 0.1971T i 2 + 17.9687T i - 485.673 In the formula, P st.Sat.ti The unit is kPa, T i The value is the flue gas temperature, expressed in °C.

[0017] More preferably, the water vapor saturation pressure P corresponding to the flue gas temperature st.Sat.ti The results were obtained using the Antoine equation: P st.Sat.ti = 10^(A-B / (T) i + C)); Among them, T i Let A be the flue gas temperature, and A, B, and C be the preset Antoine constants; A = 7.2326, B = 1795.9922, C = 244.3368.

[0018] Based on any of the above embodiments, the thermal efficiency of the condenser is calculated using the following formula: in, The amount of water vapor produced by the combustion of hydrogen in one cubic meter of fuel gas, m 3 / m 3 ; From the formula calculate; The latent heat of vaporization of water vapor in the flue gas is expressed in kJ / kg; this value is obtained from a table. The lower heating value of the gaseous fuel is expressed in kJ / m³. 3 .

[0019] Furthermore, the amount of water vapor produced by hydrogen combustion per cubic meter of fuel is calculated using the following formula: in, This represents the volume fraction of hydrogen in the fuel. denoted as , where is the volume fraction of hydrocarbons in the fuel, and n is the number of hydrogen atoms in the hydrocarbons.

[0020] Further preferred embodiments include: obtaining a simple test thermal efficiency of the boiler body. Calculate the overall thermal efficiency of the boiler including the condenser according to the following formula. : in, , The condenser's condensing heat efficiency; The flue gas heat loss rate; the gas fuel is calculated using the formula... calculate: The heat loss rate due to incomplete combustion of gas. This refers to the heat loss rate; Excess air coefficient at the smoke exhaust point; obtained from testing; The exhaust gas temperature of the condenser is given in °C; this temperature was obtained through testing. The temperature of the cold air entering the furnace is ℃; obtained from testing.

[0021] This invention also provides a boiler condenser thermal efficiency calculation system based on condensation rate calculation, comprising: a first temperature and humidity sensor, disposed at the condenser inlet, for collecting a first flue gas temperature and a first relative humidity; a second temperature and humidity sensor, disposed at the condenser outlet, for collecting a second flue gas temperature and a second relative humidity; a storage module for storing fuel characteristic parameters, the fuel characteristic parameters including at least the lower heating value of the fuel and the amount of water vapor produced by hydrogen combustion per cubic meter of fuel; and a processing module, connected to the first temperature and humidity sensor, the second temperature and humidity sensor, and the storage module, the processing module being used to execute the above-described boiler condenser thermal efficiency calculation method.

[0022] This application discloses a method and system for calculating the thermal efficiency of boiler condensers based on condensation rate. This method eliminates the need to test complex parameters; it calculates the condensation rate simply by measuring the relative humidity before and after the condenser, thus obtaining the condenser's thermal efficiency. This method enables rapid, convenient, and real-time testing of boiler condenser thermal efficiency and quick calculation of the boiler's thermal efficiency, solving the problems of existing testing methods involving numerous measurement parameters, complex calculation processes, and high equipment requirements.

[0023] This invention eliminates the need to test condenser inlet and outlet water parameters, calculate or test air and flue gas volumes, or test flue gas composition, among other redundant parameters. The condensation rate can be calculated simply by testing the relative humidity before and after the condenser, and the condenser thermal efficiency can be obtained by combining this with the gas composition. This method avoids the problems of numerous measurement parameters, complex calculation processes, and high equipment requirements.

[0024] This method can quickly, conveniently, and in real time test the thermal efficiency of boiler condensers, making it easy to understand the equipment's operating status in a timely manner.

[0025] With the increasing importance of condenser thermal efficiency and the growing number of condensing boilers, this invention can be widely promoted in the field of online testing of condensing boiler and condenser thermal efficiency, providing reliable technical support for the efficient operation of boilers. Attached Figure Description

[0026] Figure 1 This is a simplified flowchart of the boiler condenser thermal efficiency calculation method based on condensation rate according to the present invention.

[0027] Figure 2 This is a detailed flowchart illustrating the method for calculating the thermal efficiency of a boiler condenser based on condensation rate in an embodiment of the present invention. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 As shown, one embodiment of the present invention provides a method for calculating the thermal efficiency of a boiler condenser based on condensation rate, comprising the following steps: S1. Obtain the first flue gas temperature and first relative humidity at the condenser inlet, and the second flue gas temperature and second relative humidity at the condenser outlet; install a humidity-sensitive resistor and a platinum resistance thermometer before the boiler condenser to measure the flue gas temperature (T1) and the relative humidity of the steam in the flue gas before the condenser (h). RH.fg.1 Measurements were taken of the flue gas temperature (T2) and the relative humidity of the steam in the flue gas after the boiler condenser. Another set of humidity-sensitive resistors and platinum resistance thermometers were installed after the boiler condenser to measure the flue gas temperature (T2) and the relative humidity of the steam in the flue gas (h). RH.fg.2 ) measurement.

[0030] S2. Based on the first flue gas temperature and the first relative humidity, determine the first flue gas moisture content at the condenser inlet; based on the second flue gas temperature and the second relative humidity, determine the second flue gas moisture content at the condenser outlet; based on the first flue gas moisture content and the second flue gas moisture content, determine the water vapor condensation rate of the flue gas as it passes through the condenser. In S2, based on the moisture content of the first flue gas and the moisture content of the second flue gas, the water vapor condensation rate is calculated according to the following formula: Formula (1) in, For water vapor condensation rate, The first moisture content of the flue gas. This refers to the moisture content of the second flue gas.

[0031] Furthermore, the moisture content of both the first and second flue gas is calculated using the following formula: Formula (2) in, Indicates the moisture content of flue gas. P represents the mass of water vapor contained in one kilogram of dry flue gas. st.Sat.ti This represents the water vapor saturation pressure corresponding to the flue gas temperature, in kPa. Atmospheric pressure, unit: kPa.

[0032] Furthermore, the method for selecting flue gas pressure: The flue gas in a gas-fired boiler is under a slightly positive pressure. Therefore, to simplify the calculation method, the flue gas pressures P before and after the condenser are set. fg.1 and P fg.2 All are local atmospheric pressures P at , such as 101.3 kPa.

[0033] More preferably, the water vapor saturation pressure P corresponding to the flue gas temperature st.Sat.ti The following fitting formula was used to calculate: P st.Sat.ti = 0.000789T i 3 - 0.1971T i 2 + 17.9687T i - 485.673 Formula (3) In the formula, P st.Sat.ti The unit is kPa, T i The temperature of the flue gas is expressed in °C. More preferably, the water vapor saturation pressure P corresponding to the flue gas temperature st.Sat.ti The results were obtained using the Antoine equation: P st.Sat.ti = 10^(A-B / (T) i + C)) Formula (4) Among them, T iLet A be the flue gas temperature, and A, B, and C be the preset Antoine constants; A = 7.2326, B = 1795.9922, C = 244.3368.

[0034] S3. Obtain fuel characteristic parameters; the fuel characteristic parameters include at least the lower heating value of the fuel and the amount of water vapor produced by hydrogen combustion per cubic meter of fuel; wherein, the lower heating value of the fuel can be obtained by calculation or analysis data of fuel composition, or calculated by the following formula: Formula (5) in, This represents the volume fraction of each combustible gas in the gas mixture. The ideal gas volume lower heat of component i, in kJ / m³ 3 .

[0035] Furthermore, the amount of water vapor produced by hydrogen combustion per cubic meter of fuel is calculated using the following formula. Formula (6) in, This represents the volume fraction of hydrogen in the fuel. denoted as , where is the volume fraction of hydrocarbons in the fuel, and n is the number of hydrogen atoms in the hydrocarbons.

[0036] S4. The thermal efficiency of the condenser is calculated based solely on the water vapor condensation rate, the lower heating value of the fuel, and the amount of water vapor generated by the combustion of hydrogen.

[0037] The thermal efficiency of the condenser is calculated using the following formula: Formula (7) in, The amount of water vapor produced by the combustion of hydrogen in one cubic meter of fuel gas, m 3 / m 3 ; From the formula calculate; The latent heat of vaporization of water vapor in the flue gas is expressed in kJ / kg; this value is obtained from a table. The lower heating value of the gaseous fuel is expressed in kJ / m³. 3 The boiler testing method proposed in this invention is based on Appendix B of GB / T 10180-2017 "Test Procedure for Thermal Performance of Industrial Boilers"—a simple test of boiler operating thermal efficiency. Utilizing the reverse balance test method, the boiler's simple thermal efficiency is tested... ) and condenser condensing thermal efficiency ( The following formula is derived from the combination of these factors. Since the ash content of the fuel gas is extremely low, or even nonexistent, the heat loss from incomplete combustion of solids q4 and the physical heat loss from ash q6 can be neglected. Where the thermal efficiency is... It is the numerical value of the boiler's thermal efficiency after the condenser's condensation effect.

[0038] The process includes the following: A simple test to obtain the thermal efficiency of the boiler body. Calculate the overall thermal efficiency of the boiler including the condenser according to the following formula. : Formula (8) in, , The condenser's condensing heat efficiency; The flue gas heat loss rate; the gas fuel is calculated using the formula... calculate: The heat loss rate due to incomplete combustion of gas. This refers to the heat loss rate; Excess air coefficient at the smoke exhaust point; obtained from testing; The exhaust gas temperature of the condenser is given in °C; this temperature was obtained through testing. The temperature of the cold air entering the furnace is ℃; obtained from testing. , The selection is based on the CO test results as shown in the table below: Table 1 Heat loss due to incomplete combustion of gases For heat dissipation loss, %.

[0039] Furthermore, based on the actual operating conditions of the boiler, it can also be selected according to the following four categories. and The value of .

[0040] ① When the actual operating output of the boiler is not less than 75% of the rated output, Select data from Table 2; for data not in the table, use interpolation to determine boiler heat loss.

[0041] Table 2 Boiler Heat Loss ② When the actual operating output of the boiler is less than 75% of the rated output, It needs to be corrected.

[0042] or The ratio of the actual operating output to the rated output of the steam boiler; unit: % This is the ratio of the actual operating output of a hot water boiler to its rated output; unit: %.

[0043] ③ If the boiler output cannot be calculated, the actual output shall be calculated as 65% of the rated output.

[0044] ④ When the actual operating output of the boiler is less than 30% of the rated output, it shall be corrected according to the 30% output condition.

[0045] This invention also provides a boiler condenser thermal efficiency calculation system based on condensation rate, comprising: The first temperature and humidity sensor is installed at the condenser inlet to collect the first flue gas temperature and the first relative humidity; The second temperature and humidity sensor is located at the condenser outlet and is used to collect the second flue gas temperature and the second relative humidity. A storage module for storing fuel characteristic parameters, which include at least the lower heating value of the fuel and the amount of water vapor produced by hydrogen combustion per cubic meter of fuel; The processing module is connected to the first temperature and humidity sensor, the second temperature and humidity sensor, and the storage module, respectively. The processing module is used to execute the above-described method for calculating the thermal efficiency of the boiler condenser.

[0046] like Figure 2 This embodiment uses a sample of gas as a representative example to illustrate the rapid testing method of the present invention in detail. The boiler model is WNS1.4-1.0 / 95 / 70-Q boiler, with a designed rated output of 1.4MW and a designed rated pressure of 1.0MPa. The fuel used in the test is gas (96% methane (CH4) + 4% ethane (C2H6)).

[0047] Step 1: Obtain information on the distribution of gas pipelines and gas source. Gas quality analysis is related to the gas source, which in turn is related to the origin and distribution of gas pipelines.

[0048] The acquisition of gas source information is conducted through random sampling. This can involve selecting one date each month, and then randomly selecting 12 gas quality reports from different months but on the same day throughout the year for quality stability analysis. The gas company will provide quality analysis results, including the content of methane, ethane, propane, etc.; and the average lower heating value of the gas will be calculated. A quality report with a value close to the average lower heating value of the gas will be selected as the baseline gas source information.

[0049] Calculate the lower heating value of the fuel gas using 96% methane (CH4) + 4% ethane (C2H6) as an example. : At 0℃ and under standard conditions of 101.325 kPa, the lower heating value of methane is 35883 kJ / m3; the lower heating value of ethane is 64000 kJ / m3.

[0050] =0.96×35883+0.04×64000=37007.68KJ / m 3 Step 2: Determine the amount of water vapor produced by hydrogen combustion in the fuel, including the amount of water vapor produced by hydrogen combustion. The amount of water vapor produced by the combustion of hydrogen fuel gas .

[0051] The amount of water vapor produced by hydrogen combustion per cubic meter of fuel gas : according to , get.

[0052] ≈2.168m 3 / m 3 (Under standard conditions) Step 3: Determine the condensation rate of water vapor in the flue gas. Condensing thermal efficiency of boiler condensers .

[0053] Two sets of humidity-sensitive resistors and platinum resistance thermometers were placed before and after the boiler condenser on-site to measure the flue gas temperature (T1) and the relative humidity of the steam in the flue gas before the boiler condenser (h). RH.fg.1 ) and the flue gas temperature (T2) after the boiler condenser and the relative humidity of the steam in the flue gas (h RH.fg.2） Measurements were taken. Table 3 shows the test data for flue gas temperature and relative humidity before and after the boiler condenser, as well as the calculated data for the condensation rate of water vapor in the flue gas.

[0054] Table 3. Test data of flue gas temperature and relative humidity of steam before and after the furnace condenser. Substitute the test data from Table 3 above into formulas (1) to (7) to calculate the condensing thermal efficiency of the boiler condenser. That is, 8.9%.

[0055] The next step is to collect and analyze the flue gas data within 1 meter behind the boiler condenser to obtain the thermal efficiency of the condensing boiler.

[0056] Step 4: The boiler parameter acquisition device collects the flue gas after boiler combustion and performs flue gas analysis to obtain the flue gas analysis results and the reverse balance efficiency η2.

[0057] Please use the flue gas data in Table 4 below (such as the excess air coefficient at the exhaust point) O2 content (%) at the smoke exhaust point, CO content (%) at the smoke exhaust point, and smoke exhaust temperature. Temperature of cold air entering the furnace Substitute into the inverse equilibrium The calculation formulas for the test method yielded the anti-balance efficiency η2, which is 93.69%.

[0058] Step 5: According to formula (8), the reverse equilibrium efficiency η2 and the condensation heat efficiency are compared. The thermal efficiency of the condensing boiler is obtained by adding them together. That is, 102.59%.

[0059] Table 4. Flue gas test data for thermal efficiency of condensing boilers Note: Based on the lower heating value of gas, the thermal efficiency of condensing boilers will exceed 100%.

[0060] Based on the above calculations, this application achieves (1) fewer measurement parameters: avoiding the simultaneous measurement of multiple parameters and reducing the complexity of operation.

[0061] (2) The calculation process is simple: it avoids complex data calculation and reduces the requirements for the ability of testers.

[0062] (3) Reduced equipment requirements: The condensation rate can be obtained by testing relative humidity and temperature, and the thermal efficiency can be calculated by combining the gas heating capacity. No high-precision measuring equipment and complex installation and debugging are required, which reduces the difficulty and cost of maintenance.

[0063] (4) Real-time online evaluation: The required equipment is simple and all of them are online, so real-time online evaluation can be achieved, which makes it easy to understand the equipment operation status in a timely manner.

[0064] The scope of protection sought by this invention includes, but is not limited to, the above-described testing methods. Any method that employs similar technical solutions to achieve the same technical effect should fall within the scope of protection of this invention.

[0065] In particular, the innovation of this invention lies in the fact that it does not require testing the inlet and outlet water parameters of the condenser, calculating or testing the air volume and flue gas volume, or testing the flue gas composition. The condensation rate can be calculated simply by testing the relative humidity before and after the condenser, and the thermal efficiency of the condenser can be obtained by combining the gas composition. This core technical solution should be protected by patent law.

[0066] The innovation of this invention lies in the fact that it does not change the traditional simple method of thermal efficiency testing habits, but simply adds the simple method thermal efficiency to the condenser thermal efficiency to calculate the boiler thermal efficiency.

[0067] Furthermore, any improvements and modifications made based on the core technical solution of this invention, such as different fitting formulas or different humidity testing equipment, should fall within the protection scope of this invention, as long as they do not deviate from the core idea of ​​this invention.

[0068] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for calculating the thermal efficiency of a boiler condenser based on condensation rate, characterized in that, Includes the following steps: S1. Obtain the first flue gas temperature and the first relative humidity at the condenser inlet, and the second flue gas temperature and the second relative humidity at the condenser outlet; S2. Based on the first flue gas temperature and the first relative humidity, determine the first flue gas moisture content at the condenser inlet; based on the second flue gas temperature and the second relative humidity, determine the second flue gas moisture content at the condenser outlet; based on the first flue gas moisture content and the second flue gas moisture content, determine the water vapor condensation rate of the flue gas as it passes through the condenser. S3. Obtain fuel characteristic parameters; the fuel characteristic parameters include at least the lower heating value of the fuel and the amount of water vapor produced by hydrogen combustion per cubic meter of fuel; S4. The thermal efficiency of the condenser is calculated based on the water vapor condensation rate, the lower heating value of the fuel, and the amount of water vapor generated by the hydrogen combustion. The thermal efficiency of the condenser is calculated using the following formula: in, The amount of water vapor produced by the combustion of hydrogen in one cubic meter of fuel gas, m 3 / m 3 ; The latent heat of vaporization of water vapor in the flue gas is expressed in kJ / kg; this can be obtained from a table. The lower heating value of the gaseous fuel is expressed in kJ / m³. 3 .

2. The method for calculating the thermal efficiency of a boiler condenser based on condensation rate according to claim 1, characterized in that, In S2, based on the moisture content of the first flue gas and the moisture content of the second flue gas, the water vapor condensation rate is calculated according to the following formula: in, For water vapor condensation rate, The first moisture content of the flue gas. This refers to the moisture content of the second flue gas.

3. The method for calculating the thermal efficiency of a boiler condenser based on condensation rate according to claim 2, characterized in that, The moisture content of the first and second flue gas are both calculated using the following formula: in, Indicates the moisture content of flue gas. P represents the mass of water vapor contained in one kilogram of dry flue gas. st.Sat.ti This represents the water vapor saturation pressure corresponding to the flue gas temperature, in kPa. Atmospheric pressure, unit: kPa.

4. The method for calculating the thermal efficiency of a boiler condenser based on condensation rate according to claim 3, characterized in that, The water vapor saturation pressure P corresponding to the flue gas temperature st.Sat.ti The following fitting formula was used to calculate: P st.Sat.ti = 0.000789T i ³ - 0.1971T i ² + 17.9687T i - 485.673 In the formula, P st.Sat.ti The unit is kPa, T i The value is the flue gas temperature, expressed in °C.

5. The method for calculating the thermal efficiency of a boiler condenser based on condensation rate according to claim 3, characterized in that, The water vapor saturation pressure P corresponding to the flue gas temperature st.Sat.ti The results were obtained using the Antoine equation: P st.Sat.ti = 10^(A- B / (T i + C)) ; Among them, T i Let A be the flue gas temperature, and A, B, and C be the preset Antoine constants; A = 7.2326, B = 1795.9922, C = 244.3368.

6. The method for calculating the thermal efficiency of a boiler condenser based on condensation rate according to claim 5, characterized in that, The amount of water vapor produced by hydrogen combustion per cubic meter of fuel is calculated using the following formula: in, This represents the volume fraction of hydrogen in the fuel. denoted as , where is the volume fraction of hydrocarbons in the fuel, and n is the number of hydrogen atoms in the hydrocarbons.

7. The method for calculating the thermal efficiency of a boiler condenser based on condensation rate according to claim 6, characterized in that, Also includes: A simple test to obtain the thermal efficiency of the boiler body. ; The overall thermal efficiency of the boiler including the condenser is calculated using the following formula. : ; in, , The condenser's condensing heat efficiency; The flue gas heat loss rate; the gas fuel is calculated using the formula... calculate: The heat loss rate due to incomplete combustion of gas. This refers to the heat loss rate; Excess air coefficient at the smoke exhaust point; obtained from testing; The exhaust gas temperature of the condenser is ℃; Determined by testing; The temperature of the cold air entering the furnace is ℃; obtained from testing.

8. A boiler condenser thermal efficiency calculation system based on condensation rate, characterized in that, include: The first temperature and humidity sensor is installed at the condenser inlet to collect the first flue gas temperature and the first relative humidity; The second temperature and humidity sensor is located at the condenser outlet and is used to collect the second flue gas temperature and the second relative humidity. A storage module for storing fuel characteristic parameters, which include at least the lower heating value of the fuel and the amount of water vapor produced by hydrogen combustion per cubic meter of fuel; The processing module is connected to the first temperature and humidity sensor, the second temperature and humidity sensor, and the storage module, respectively. The processing module is used to execute the boiler condenser thermal efficiency calculation method according to any one of claims 1 to 7.

Images