A method for natural gas and hydrogen fuel control valve safety design and monitoring

Abstract

The application provides a method for safety design and monitoring of a natural gas and hydrogen fuel control valve, which realizes safety design monitoring and structure optimization improvement of the fuel control valve in the design stage through sequentially performing steps of modeling, data collection, analysis calculation, safety monitoring and structure optimization improvement, and guarantees safe service of the natural gas and hydrogen fuel control valve of a gas turbine.

Description

Technical Field

[0001] This invention relates to the field of gas turbine power generation technology, and in particular to a method for safety design and monitoring of natural gas and hydrogen fuel control valves. Background Technology

[0002] As a core component of the fuel system for heavy-duty gas turbines and hydrogen fuel cell gas turbines, the fuel control valve has become a key technology for the localization of these technologies. Due to frequent start-ups and shutdowns of gas turbines and drastic changes in natural gas or hydrogen parameters, the fuel control valve experiences complex stress conditions. Under transient operating conditions of the gas turbine, thermal stress can easily cause structural deformation, leading to failure in the fit between important components of the fuel control valve. This affects the safe operation of the fuel control valve and can also easily increase the stress on important components, resulting in damage to the fuel control valve.

[0003] In the field of engineering design, since the valve body of the natural gas and hydrogen fuel control valve of the gas turbine is a durable part, its shape is usually irregular during the design, and as an important pressure-bearing component, there are many weak points in structural strength and safety.

[0004] However, at present, there are no suitable safety design and monitoring methods available in China for the design and production of fuel control valves in the fields of heavy-duty gas turbines and hydrogen fuel cell gas turbines.

[0005] Therefore, it is of great significance to develop a method for the safety design and monitoring of control valves for natural gas and hydrogen fuels. Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention provides a method for safety design and monitoring of natural gas and hydrogen fuel control valves, which realizes safety design monitoring and structural optimization and improvement of fuel control valves during the design stage, so as to ensure the safe service of natural gas and hydrogen fuel control valves in gas turbines.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a method for safety design and monitoring of natural gas and hydrogen fuel control valves, the method comprising the following steps:

[0009] Step 1: Construct safety analysis models for natural gas and hydrogen fuel control valves;

[0010] The second step is to determine the material names, properties, and component clearance values ​​of each component in the natural gas and hydrogen fuel control valves.

[0011] The third step is to determine the boundary conditions and initial conditions for the safety analysis of the natural gas and hydrogen fuel control valves.

[0012] Step 4: Determine the contact configuration between the components of the natural gas and hydrogen fuel control valves;

[0013] Step 5: Calculate the temperature field, displacement field, and stress field of the natural gas and hydrogen fuel control valves;

[0014] Step 6: Monitor and optimize the deformation safety of natural gas and hydrogen fuel control valves;

[0015] Step 7: Monitor and optimize the structural strength and safety of natural gas and hydrogen fuel control valves under steady-state operating conditions;

[0016] Step 8: Monitor and optimize the structural strength and safety of natural gas and hydrogen fuel control valves under transient operating conditions.

[0017] The method for safety design and monitoring of natural gas and hydrogen fuel control valves described in this invention achieves safety design and monitoring of natural gas and hydrogen fuel control valves by sequentially performing modeling, data collection, analysis and calculation of safety monitoring, and structural optimization and improvement steps. When the structural strength and safety monitoring of the natural gas and hydrogen fuel control valve fails to meet the requirements under steady-state and transient variable operating conditions, the structural strength and safety of the natural gas and hydrogen fuel control valve can be ensured by replacing the relevant components with materials with better mechanical properties, increasing the cross-sectional area of ​​the relevant components, or increasing the radius of the structural fillet at stress concentration points. The method for safety design and monitoring of natural gas and hydrogen fuel control valves described in this invention can also be used for the safety design and monitoring of fuel control valve components.

[0018] The method for safety design and monitoring of natural gas and hydrogen fuel control valves described in this invention employs a system comprising independent modeling and data collection modules, which are sequentially connected to an analysis and calculation module, a safety monitoring module, and a structural optimization and improvement module.

[0019] When the data output by the safety monitoring module is qualified, the safety design and monitoring of the natural gas and hydrogen fuel control valves ends. When the data output by the safety monitoring module is unqualified, the data is input to the structural optimization and improvement module for optimization processing, and then continues to be input to the modeling module and data collection module to start a new round of safety design and monitoring until the data output by the safety monitoring module is qualified.

[0020] Furthermore, the step of constructing the safety analysis model for the natural gas and hydrogen fuel control valves in the first step specifically includes:

[0021] Using existing modeling techniques, three-dimensional models of natural gas and hydrogen fuel control valves were constructed based on the design drawings.

[0022] Furthermore, in the first step of constructing the safety analysis model for the natural gas and hydrogen fuel control valves, the effects of threads, grooves, and holes are ignored to avoid unnecessary stress concentration.

[0023] Furthermore, the second step of determining the material names, properties, and component clearance values ​​of each component of the natural gas and hydrogen fuel control valves specifically includes:

[0024] Based on the design drawings, identify the material names and clearance values ​​of each component of the natural gas and hydrogen fuel control valve, and collect the corresponding physical and mechanical properties of each material.

[0025] Preferably, the physical properties include density ρ, elastic modulus E, Poisson's ratio υ, coefficient of linear expansion α, specific heat capacity Cp, and thermal conductivity λ.

[0026] Preferably, the mechanical properties include allowable stress [s] and the yield strength of the material at the operating temperature.

[0027] Preferably, the component clearance value includes the minimum clearance δ between the fuel control valve stem and the guide sleeve. min and maximum value δ max This is because, under high-temperature conditions, the different materials of the valve stem and the guide sleeve result in different thermal expansion, which in turn affects the gap between the valve stem and the guide sleeve, causing the valve stem to jam or vibrate.

[0028] In this invention, if the gap between the valve stem and the guide sleeve of the natural gas and hydrogen fuel control valve is too large or too small under various operating conditions, the components involving the important gaps of the natural gas and hydrogen fuel control valve can be replaced with materials with similar mechanical properties, or the structure of the gap area can be improved, so that the deformation safety of the natural gas and hydrogen fuel control valve meets the requirements.

[0029] Furthermore, the steps in the third step of determining the boundary conditions and initial conditions for the safety analysis of the natural gas and hydrogen fuel control valves specifically include:

[0030] Based on the natural gas parameters under various operating conditions of the gas turbine, the force boundary conditions and thermal boundary conditions for the safety analysis of the natural gas and hydrogen fuel control valves are determined.

[0031] Based on the initial temperature distribution of the natural gas and hydrogen fuel control valves under various operating conditions of the gas turbine, the initial conditions for the safety analysis of the natural gas and hydrogen fuel control valves are determined.

[0032] Furthermore, the step of determining the contact configuration between the components of the natural gas and hydrogen fuel control valves in the fourth step specifically includes:

[0033] Based on the design drawings of the natural gas and hydrogen fuel control valves, the contact forms between each component are clearly defined to distinguish whether the contact interfaces can be separated, whether they can slide freely, and whether there is friction.

[0034] The contact method described applies only to the interaction between two components and is not considered when designing the safety of a single component; this step can be ignored.

[0035] Furthermore, the fifth step, which involves calculating the temperature field, displacement field, and stress field of the natural gas and hydrogen fuel control valves, specifically includes:

[0036] (1) Import the model, material mechanical properties, material physical properties, boundary conditions, and initial conditions into the finite element analysis tool;

[0037] (2) Calculate the temperature field, displacement field, and stress field distribution of the natural gas and hydrogen fuel control valves under steady-state conditions. The steady-state conditions include the gas turbine steady-state rated load condition, the fuel valve design condition, and the fuel valve hydrostatic test condition. Obtain the relative distance δ of the important gaps of the natural gas and hydrogen fuel control valves, as well as the equivalent stress s on the surface of the natural gas and hydrogen fuel control valves. eq2 The distribution and location of maximum stress;

[0038] (3) Calculate the temperature field, displacement field, and stress field distribution of the natural gas and hydrogen fuel control valves under transient variable operating conditions. The transient variable operating conditions include hot start-up condition, warm start-up condition, cold start-up condition, variable load condition, and gas turbine shutdown condition. Obtain the relative distance δ of the important gaps of the natural gas and hydrogen fuel control valves, and the maximum equivalent surface stress s of the stress concentration parts of the natural gas and hydrogen fuel control valves. eq3 The distribution of stress and the location where the maximum stress occurs.

[0039] Furthermore, the sixth step of monitoring and optimizing the deformation safety of the natural gas and hydrogen fuel control valves specifically includes:

[0040] (1) If δ max ≥δ≥δ min The structural deformation caused by thermal stress will not affect the normal operation of the natural gas and hydrogen fuel control valves, indicating that the relative distance δ of the important gaps of the natural gas and hydrogen fuel control valves under various operating conditions is under control. The safety monitoring of the deformation of the natural gas and hydrogen fuel control valves is completed, and we will proceed to step seven.

[0041] (2) If δ < δ minStructural deformation caused by thermal expansion can affect the normal operation of natural gas and hydrogen fuel control valves, indicating that components involving critical clearances in natural gas and hydrogen fuel control valves need to be optimized and improved during the design phase. This could involve using materials with similar mechanical properties, improving the structure of the clearance areas, and repeating steps one through six until δ ≥ δ. min until;

[0042] (3) If δ>δ max Structural deformation caused by thermal expansion can affect the normal operation of natural gas and hydrogen fuel control valves, indicating that components involving critical clearances in natural gas and hydrogen fuel control valves need to be optimized and improved during the design phase. This could involve using materials with similar mechanical properties, or improving the structure of the clearance areas, and repeating steps one through six until δ ≤ δ max until.

[0043] Furthermore, the seventh step, which involves monitoring and optimizing the structural safety of the natural gas and hydrogen fuel control valves under steady-state operating conditions, specifically includes:

[0044] (1) If s eq2 ≤[s], the surface equivalent stress s of natural gas and hydrogen fuel control valves under steady-state conditions. eq2 The structural safety design is qualified, indicating that the surface equivalent stress s of the natural gas and hydrogen fuel control valves is within acceptable limits under steady-state operating conditions. eq2 Under controlled conditions, the surface equivalent stress s of the natural gas and hydrogen fuel control valves eq2 The structural safety monitoring has ended; proceed to step eight.

[0045] (2) If s eq2 >[s], the surface equivalent stress s of the natural gas and hydrogen fuel control valves under steady-state conditions. eq2 The structural safety design is substandard, indicating that the materials or structure of the natural gas and hydrogen fuel control valves need to be optimized and improved during the design phase. This could involve using materials with better mechanical properties, or increasing the cross-sectional area of ​​the relevant components of the natural gas and hydrogen fuel control valves. Steps one through seven should be repeated until steps s are completed. eq2 Until ≤[s].

[0046] Furthermore, the eighth step, which involves monitoring and optimizing the structural safety of the natural gas and hydrogen fuel control valves under transient operating conditions, specifically includes:

[0047] (1) If The maximum equivalent surface stress s at the stress concentration point of the natural gas and hydrogen fuel control valve under transient operating conditions eq3 The structural safety design is qualified, indicating that the maximum equivalent surface stress s at the stress concentration points of the natural gas and hydrogen fuel control valves under transient operating conditions is within acceptable limits. eq3Under controlled conditions, the maximum equivalent surface stress s at the stress concentration point of the natural gas and hydrogen fuel control valve. eq3 Structural safety monitoring has ended;

[0048] (2) If The maximum equivalent surface stress s at the stress concentration point of the natural gas and hydrogen fuel control valve under transient operating conditions eq3 The structural safety design is inadequate, indicating that the structure of the stress concentration areas on the surface of the natural gas and hydrogen fuel control valves needs to be optimized and improved during the design phase. This includes increasing the fillet radius of the stress concentration areas and repeating steps one through eight until... until.

[0049] Preferably, for casting materials, C = 1.5, and for forging materials, C = 2.

[0050] In this invention, if the structural strength and safety monitoring of the natural gas and hydrogen fuel control valve fails to meet the requirements under steady-state and transient variable conditions, the relevant components of the gas fuel control are replaced with materials with better mechanical properties, or the cross-sectional area of ​​the relevant components is increased, or the radius of the structural fillet at the stress concentration point is increased, so that the structural strength and safety of the natural gas and hydrogen fuel control valve meets the requirements.

[0051] Compared with the prior art, the present invention has at least the following beneficial effects:

[0052] The present invention provides a method for safety design and monitoring of natural gas and hydrogen fuel control valves, enabling safety design monitoring and structural optimization improvements. When the structural strength and safety monitoring of the natural gas and hydrogen fuel control valve fails to meet the requirements, the relevant components can be replaced with materials with better mechanical properties, the cross-sectional area of ​​the relevant components can be increased, or the radius of the structural fillet at stress concentration points can be increased, thus ensuring that the structural strength and safety of the natural gas and hydrogen fuel control valve meet the requirements. Attached Figure Description

[0053] Figure 1 This is a flowchart of the method for safety design and monitoring of natural gas and hydrogen fuel control valves provided by the present invention;

[0054] Figure 2 A block diagram of a system used for safety design and monitoring methods of control valves for natural gas and hydrogen fuels;

[0055] Figure 3 This is a schematic diagram of the structure of the natural gas and hydrogen fuel control valve for a certain type of heavy-duty gas turbine. Detailed Implementation

[0056] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0057] The present invention will now be described in further detail. However, the examples described below are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

[0058] Example 1

[0059] This embodiment provides a method for the safety design and monitoring of natural gas and hydrogen fuel control valves, the flowchart of which is shown below. Figure 1 As shown; the block diagram of the system used in this method is as follows. Figure 2 As shown.

[0060] This embodiment uses a natural gas and hydrogen fuel control valve for a certain type of heavy-duty gas turbine, with a nominal diameter of DN80, a design temperature of 220℃, and a design pressure of 4MPa, as an example to carry out safety design and monitoring. A schematic diagram of the structure of this heavy-duty gas turbine natural gas and hydrogen fuel control valve is shown below. Figure 3 As shown.

[0061] The method includes the following steps:

[0062] Step 1: Construct a safety analysis model for natural gas and hydrogen fuel control valves. Use modeling software to create a 3D model of the fuel control valve according to the design drawings, and perform some simple processing. Use solid parts to replace the threads, grooves, holes and monitoring methods on the fuel control valve to avoid unnecessary stress concentration.

[0063] The second step is to determine the material names, properties, and component clearance values ​​of each component in the natural gas and hydrogen fuel control valves. Consult relevant specifications to clarify the corresponding material's density ρ, elastic modulus E, Poisson's ratio υ, coefficient of linear expansion α, specific heat capacity Cp, thermal conductivity λ, allowable stress [s], and yield strength at the operating temperature. The monitoring method uses data and, through the design drawings of natural gas and hydrogen fuel control valves, determines the minimum clearance δ between the valve stem and guide sleeve of the fuel control valve. min and maximum value δ max ;

[0064] The third step is to determine the boundary conditions and initial conditions for the safety analysis of natural gas and hydrogen fuel control valves. By using natural gas data under various operating conditions of a certain type of heavy-duty gas turbine, as well as the operating environment of natural gas and hydrogen fuel control valves, the thermal boundary conditions and force boundary conditions of the fuel control valves are clarified.

[0065] Based on the initial temperature distribution of the natural gas and hydrogen fuel control valves under various operating conditions of the heavy-duty gas turbine, the initial conditions for the safety analysis of the natural gas and hydrogen fuel control valves are determined.

[0066] Step 4: Determine the contact form between the components of the natural gas and hydrogen fuel control valves. Based on the design drawings of the natural gas and hydrogen fuel control valves, clarify the contact form between the components.

[0067] Step 5: Calculate the temperature field, displacement field, and stress field of the natural gas and hydrogen fuel control valves, and import the three-dimensional models of the natural gas and hydrogen fuel control valves, material mechanical properties, material physical properties, boundary conditions, and initial conditions into the finite element analysis tool.

[0068] Using existing technology, the temperature, displacement, and stress field distributions of the fuel control valve were calculated under the steady-state rated load condition of the gas turbine, the design condition of the fuel valve, and the hydraulic pressure test condition of the fuel valve. This yielded the relative distance δ between the valve stem and the guide sleeve of the fuel control valve, as well as the equivalent surface stress s of the fuel control valve. eq2 The distribution and location of maximum stress;

[0069] Using existing technology, the temperature, displacement, and stress field distributions of the fuel control valve under gas turbine shutdown and hot start-up conditions are calculated. This yields the relative distance δ between the valve stem and guide sleeve, and the maximum equivalent surface stress s at stress concentration points on the fuel control valve. eq3 The distribution and location of maximum stress;

[0070] The deformation and stress results calculated for the temperature field, displacement field, and stress field of the control valves for natural gas and hydrogen fuels are listed in Tables 1 and 2, respectively:

[0071] Table 1

[0072] Serial Number Operating conditions gap gap value Gap position 1 Rated load steady-state condition δ(mm) 0.24 Between valve stem and guide sleeve 2 Fuel valve design conditions δ(mm) 0.23 Between valve stem and guide sleeve 3 Fuel valve water pressure test conditions δ(mm) 0.27 Between valve stem and guide sleeve 4 Gas turbine shutdown conditions δ(mm) 0.22 Between valve stem and guide sleeve 5 Gas turbine hot start-up conditions δ(mm) 0.22 Between valve stem and guide sleeve

[0073] Table 2

[0074] Serial Number Operating conditions stress Maximum value Location of occurrence 1 Rated load steady-state condition <![CDATA[s eq2 (MPa)]]> 27.75 The lower side of the flow channel inflection point on the inner surface of the valve housing 2 Fuel valve design conditions <![CDATA[s eq2 (MPa)]]> 35.72 The lower side of the flow channel inflection point on the inner surface of the valve housing 3 Fuel valve water pressure test conditions <![CDATA[s eq2 (MPa)]]> 74.83 The lower side of the flow channel inflection point on the inner surface of the valve housing 4 Gas turbine shutdown conditions <![CDATA[s eq3 (MPa)]]> 52.94 Upper side of the flow channel inflection point on the inner surface of the valve housing 5 Gas turbine hot start-up conditions <![CDATA[s eq3 (MPa)]]> 302.79 Lower fillet of valve body outlet boss

[0075] Step 6: Monitor and optimize the safety of natural gas and hydrogen fuel control valve deformation.

[0076] According to the design drawings of the natural gas and hydrogen fuel control valves, the clearance range between the valve stem and the guide sleeve of the fuel control valve is 0.2mm≤δ0≤0.3mm, and the minimum clearance value is δ min The maximum gap is δ, which is 0.2 mm. max It is 0.3mm;

[0077] (1) If δ min ≤δ≤δ max The structural deformation caused by thermal stress does not affect the normal operation of the fuel control valve, indicating that the gap δ between the fuel control valve stem and the guide sleeve is under control under various operating conditions. The safety monitoring of the deformation of the natural gas and hydrogen fuel control valves is completed, and we proceed to step seven.

[0078] (2) If δ < δ min Structural deformation caused by thermal expansion can affect the normal operation of the fuel control valve, indicating that the components involving the gap between the valve stem and the guide sleeve need to be optimized and improved during the design phase. This could involve using materials with similar mechanical properties, or improving the structure of the gap area, and repeating steps one through six until δ ≥ δ min until;

[0079] (3) If δ>δ max Structural deformation caused by thermal expansion can affect the normal operation of the fuel control valve, indicating that the components involving the gap between the valve stem and the guide sleeve need to be optimized and improved during the design phase. This could involve using materials with similar mechanical properties, improving the structure of the gap area, and repeating steps one through six until δ ≤ δ max until.

[0080] The deformation results of the natural gas and hydrogen fuel control valves in step 5 were compared with the clearance design values ​​mentioned in this step. The clearance values ​​between the valve stem and the guide sleeve of the natural gas and hydrogen fuel control valves were qualified under all operating conditions and no optimization was required. The safety monitoring results of the fuel control valve deformation are listed in Table 3.

[0081] Table 3

[0082]

[0083]

[0084] Step 7: Monitor and optimize the structural strength and safety of natural gas and hydrogen fuel control valves under steady-state operating conditions.

[0085] (1) If s eq2 ≤[s], the surface equivalent stress s of natural gas and hydrogen fuel control valves under steady-state conditions. eq2 The structural strength and safety design is qualified, indicating that the surface equivalent stress s of the fuel control valve is within acceptable limits under steady-state conditions. eq2 Under controlled conditions, the surface equivalent stress s of the fuel control valve eq2 Monitoring has ended; proceed to step eight.

[0086] (2) If s eq2 >[s], the surface equivalent stress s of the natural gas and hydrogen fuel control valves under steady-state conditions. eq2 The structural strength and safety design is substandard, indicating that the materials or structure of the fuel control valve need to be optimized and improved during the design phase. This could involve using materials with better mechanical properties or increasing the cross-sectional area of ​​the fuel control valve. Steps one through seven should then be repeated until steps s are completed. eq2 Until ≤[s].

[0087] The equivalent stress s on the surface of the natural gas and hydrogen fuel control valves in step five. eq2 The calculation results were compared with the allowable stress [s] of the material to which the occurrence occurred. Under steady-state conditions, the structural strength and safety monitoring of the fuel control valve were all qualified and no optimization was required. The structural strength and safety monitoring results of the fuel control valve are listed in Table 4.

[0088] Table 4

[0089] Serial Number Operating conditions <![CDATA[s eq2 ]]> [s] Monitoring results 1 Rated load steady-state condition 27.75MPa 133MPa <![CDATA[s eq2 ≤[s], qualified 2 Fuel valve design conditions 35.72MPa 129.8MPa <![CDATA[s eq2 ≤[s], qualified 3 Fuel valve water pressure test conditions 74.83MPa 138MPa <![CDATA[s eq2 ≤[s], qualified

[0090] Step 8: Monitor and optimize the structural strength and safety of natural gas and hydrogen fuel control valves under transient operating conditions.

[0091] (1) If The maximum equivalent surface stress s at the stress concentration point of the natural gas and hydrogen fuel control valve under transient operating conditions eq3 The structural strength and safety design is qualified, indicating that the maximum equivalent surface stress s at the stress concentration point of the fuel control valve under transient variable operating conditions is within acceptable limits. eq3 Under controlled conditions, the maximum equivalent surface stress s at the stress concentration point of the fuel control valve eq3 The monitoring has ended;

[0092] (2) If The maximum equivalent surface stress s at the stress concentration point of the natural gas and hydrogen fuel control valve under transient operating conditions eq3 The structural strength and safety design is substandard, indicating that the structure of the stress concentration areas on the surface of the fuel control valve needs to be optimized and improved during the design phase. This includes increasing the fillet radius of the stress concentration areas and repeating steps one through eight until... until.

[0093] The C mentioned is an empirical constant. Based on the calculation results in step five, the maximum equivalent surface stress s at the stress concentration point of the fuel control valve is... eq3 The maximum value occurs on the valve body, which is a CF8M casting with C=1.5.

[0094] The maximum equivalent surface stress s at the stress concentration points of the natural gas and hydrogen fuel control valves in step five. eq3 The calculation results are related to the yield strength of the material at the working temperature of the affected area. In comparison, the structural strength and safety monitoring of the fuel control valve under the hot start-up condition of the gas turbine was unqualified, and the results of the structural strength and safety monitoring of the fuel control valve under the transient variable condition are listed in Table 5.

[0095] Table 5

[0096]

[0097] Following the steps, the structure of the stress concentration area on the surface of the fuel control valve is optimized. In the hot start-up condition of the gas turbine, the stress concentration area of ​​the fuel control valve is located at the lower fillet of the valve housing outlet boss. Therefore, the fillet radius of the lower fillet of the valve housing outlet boss needs to be increased. Steps one through eight are then repeated until… until.

[0098] The structure of the natural gas and hydrogen fuel control valve in this embodiment was optimized. The radius of the fillet at the lower corner of the valve body outlet boss was increased from 0.5mm to 2mm. The results of steps six to eight after optimization are shown in the table below:

[0099] Table 6

[0100] Serial Number Operating conditions δ(mm) <![CDATA[δ0(mm)]]> Monitoring results 1 Rated load steady-state condition 0.24 [0.2，0.3] <![CDATA[δ min ≤δ≤δ max , Passed]]> 2 Fuel valve design conditions 0.23 [0.2，0.3] <![CDATA[δ min ≤δ≤δ max , Passed]]> 3 Fuel valve water pressure test conditions 0.27 [0.2，0.3] <![CDATA[δ min ≤δ≤δ max Passed<!-- 7 --> ]]> 4 Gas turbine shutdown conditions 0.22 [0.2，0.3] <![CDATA[δ min ≤δ≤δ max , Passed]]> 5 Gas turbine hot start-up conditions 0.22 [0.2，0.3] <![CDATA[δ min ≤δ≤δ max , Passed]]>

[0101] Table 7

[0102] Serial Number Operating conditions <![CDATA[s eq2 ]]> [s] Monitoring results 1 Rated load steady-state condition 28.03MPa 133MPa <![CDATA[s eq2 ≤[s], qualified 2 Fuel valve design conditions 36.04MPa 129.8MPa <![CDATA[s eq2 ≤[s], qualified 3 Fuel valve water pressure test conditions 77.47MPa 138MPa <![CDATA[s eq2 ≤[s], qualified

[0103] Table 8

[0104]

[0105] In summary, the method for safety design and monitoring of natural gas and hydrogen fuel control valves provided by this invention achieves safety design and structural optimization improvement of the fuel control valve for this type of heavy-duty gas turbine. The structural safety design of the fuel control valve for this type of heavy-duty gas turbine is inadequate under the hot start-up conditions of the gas turbine. By increasing the radius of the fillet below the outlet boss of the fuel control valve body at the stress concentration point, the safety of the fuel control valve for this type of heavy-duty gas turbine is brought under control.

[0106] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for safety design and monitoring of natural gas and hydrogen fuel control valves, characterized in that, The method includes the following steps: Step 1: Construct safety analysis models for natural gas and hydrogen fuel control valves; The second step is to determine the material names, properties, and component clearance values ​​of each component in the natural gas and hydrogen fuel control valves. The third step is to determine the boundary conditions and initial conditions for the safety analysis of the natural gas and hydrogen fuel control valves. Step 4: Determine the contact configuration between the components of the natural gas and hydrogen fuel control valves; Step 5: Calculate the temperature field, displacement field, and stress field of the natural gas and hydrogen fuel control valves; Step 6: Monitor and optimize the deformation safety of natural gas and hydrogen fuel control valves; Step 7: Monitor and optimize the structural strength and safety of natural gas and hydrogen fuel control valves under steady-state operating conditions; Step 8: Monitor and optimize the structural strength and safety of natural gas and hydrogen fuel control valves under transient operating conditions; Specifically, the fifth step of calculating the temperature field, displacement field, and stress field of the natural gas and hydrogen fuel control valves includes: (1) Import the model, material mechanical properties, material physical properties, boundary conditions, and initial conditions into the finite element analysis tool; (2) Calculate the temperature field, displacement field, and stress field distribution of the natural gas and hydrogen fuel control valves under steady-state conditions. The steady-state conditions include the gas turbine steady-state rated load condition, the fuel valve design condition, and the fuel valve hydrostatic test condition. Obtain the relative distances of the important clearances of the natural gas and hydrogen fuel control valves. δ As well as the surface equivalent stress of natural gas and hydrogen fuel control valves. s eq2 The distribution and location of maximum stress; (3) Calculate the temperature field, displacement field, and stress field distribution of the natural gas and hydrogen fuel control valves under transient variable operating conditions, including gas turbine hot start-up, warm start-up, cold start-up, variable load, and gas turbine shutdown conditions, and obtain the relative distances of the important clearances of the natural gas and hydrogen fuel control valves. δ And the maximum equivalent surface stress at stress concentration points in natural gas and hydrogen fuel control valves. s eq3 The distribution of stress and the location where the maximum stress occurs.

2. The method according to claim 1, characterized in that, In the first step of constructing the safety analysis model for natural gas and hydrogen fuel control valves, the effects of threads, grooves, and holes are ignored.

3. The method according to claim 1 or 2, characterized in that, The performance in the second step includes physical properties and mechanical properties.

4. The method according to claim 3, characterized in that, The physical properties include density. ρ Elastic modulus E Poisson's ratio υ Coefficient of linear expansion α Specific heat capacity Cp and thermal conductivity λ .

5. The method according to claim 3, characterized in that, The mechanical properties include allowable stress. s [and the yield strength of the material at the operating temperature] .

6. The method according to claim 1, characterized in that, The component clearance values ​​in the second step include the minimum clearance between the fuel control valve stem and the guide sleeve. δ min and maximum value δ max .

7. The method according to claim 1, characterized in that, The boundary conditions in the third step include force boundary conditions and thermal boundary conditions.

8. The method according to claim 7, characterized in that, The force boundary conditions and thermal boundary conditions for the safety analysis of the natural gas and hydrogen fuel control valves are determined based on the natural gas parameters under various operating conditions of the gas turbine.

9. The method according to claim 1, characterized in that, The initial conditions for the safety analysis of the natural gas and hydrogen fuel control valves in the third step are determined based on the initial temperature distribution of the natural gas and hydrogen fuel control valves under various operating conditions of the gas turbine.

10. The method according to claim 1, characterized in that, In the fourth step, the contact form between each component is determined based on the design drawings of the natural gas and hydrogen fuel control valves, so as to distinguish whether the contact interface can be separated, whether it can slide freely, and whether there is friction.

11. The method according to claim 6, characterized in that, The sixth step, which involves monitoring and optimizing the deformation safety of natural gas and hydrogen fuel control valves, specifically includes: (1) If δ max ≥ δ ≥ δ min The structural deformation caused by thermal stress does not affect the normal operation of the natural gas and hydrogen fuel control valves, indicating the relative distance of the critical clearances of the natural gas and hydrogen fuel control valves under various operating conditions. δ The natural gas and hydrogen fuel control valve deformation safety monitoring has ended and the process has entered step seven; (2) If δ < δ min Structural deformation caused by thermal expansion can affect the normal operation of natural gas and hydrogen fuel control valves, indicating that components involving critical clearances in natural gas and hydrogen fuel control valves need to be optimized and improved during the design phase. This could involve using materials with similar mechanical properties, or improving the structure of the clearance areas, and repeating steps one through six until... δ ≥ δ min until; (3) If δ > δ max Structural deformation caused by thermal expansion can affect the normal operation of natural gas and hydrogen fuel control valves, indicating that components involving critical clearances in natural gas and hydrogen fuel control valves need to be optimized and improved during the design phase. This could involve using materials with similar mechanical properties, or improving the structure of the clearance areas, and repeating steps one through six until... δ ≤ δ max until.

12. The method according to claim 5, characterized in that, The seventh step, which involves monitoring and optimizing the structural safety of natural gas and hydrogen fuel control valves under steady-state operating conditions, specifically includes: (1) If s eq2 ≤[ s Surface equivalent stress of natural gas and hydrogen fuel control valves under steady-state conditions s eq2 The structural safety design is qualified, indicating that the surface equivalent stress of the natural gas and hydrogen fuel control valves is within acceptable limits under steady-state operating conditions. s eq2 Under controlled conditions, the surface equivalent stress of the natural gas and hydrogen fuel control valves s eq2 The structural safety monitoring has ended; proceed to step eight. (2) If s eq2 >[ s Surface equivalent stress of natural gas and hydrogen fuel control valves under steady-state conditions s eq2 The structural safety design is substandard, indicating that the materials or structure of the natural gas and hydrogen fuel control valves need to be optimized and improved during the design phase. This could involve using materials with better mechanical properties or increasing the cross-sectional area of ​​the relevant components of the natural gas and hydrogen fuel control valves. Steps one through seven should be repeated until... s eq2 ≤[ s ]until.

13. The method according to claim 5, characterized in that, The steps in the eighth step of monitoring and optimizing the structural safety of natural gas and hydrogen fuel control valves under transient operating conditions specifically include: (1) If s eq3 ≤ Maximum equivalent surface stress at stress concentration points in natural gas and hydrogen fuel control valves under transient operating conditions s eq3 The structural safety design is qualified, indicating that the maximum equivalent surface stress at the stress concentration points of the natural gas and hydrogen fuel control valves under transient operating conditions is satisfactory. s eq3 Under controlled conditions, the maximum equivalent surface stress at the stress concentration points of the natural gas and hydrogen fuel control valves. s eq3 Structural safety monitoring has ended; (2) If s eq3 > Maximum equivalent surface stress at stress concentration points in natural gas and hydrogen fuel control valves under transient operating conditions s eq3 The structural safety design is inadequate, indicating that the structure of the stress concentration areas on the surface of the natural gas and hydrogen fuel control valves needs to be optimized and improved during the design phase. This includes increasing the fillet radius of the stress concentration areas and repeating steps one through eight until... s eq3 ≤ until; in, C This is an empirical constant.

14. The method according to claim 13, characterized in that, For casting materials C =1.5; For forging materials, C =2.

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