Calculation method for the effect of ambient temperature on turbine differential expansion

Abstract

A method for calculating the effect of ambient temperature on turbine expansion difference includes setting an ambient temperature and a reference temperature; calculating the total expansion amount affected by ambient temperature; verifying the expansion changes caused by the temperature difference between the turbine body and the foundation; obtaining the total expansion amount at the corresponding dead point position; the expansion changes include installation in a high-temperature environment and operation in a low-temperature environment and operation in a low-temperature environment, thereby obtaining the actual expansion difference value during operation. This method provides a theoretical basis for the axial clearance arrangement of the unit, ensuring that the axial clearance of the unit does not cause rubbing, thereby ensuring the safe and stable operation of the unit.

Description

Technical Field

[0001] This invention relates to a method for calculating turbine expansion difference, and more particularly to a method for calculating the influence of ambient temperature on turbine expansion difference. Background Technology

[0002] During the start-up and shutdown of a steam turbine, the heat exchange conditions between the rotor and the cylinder differ. This results in inconsistent axial expansion, known as relative expansion. The magnitude of this relative expansion is called differential expansion. The size of the differential expansion indicates the change in the axial dynamic-static clearance of the steam turbine. The axial clearance needs to be properly arranged to prevent friction between the dynamic and static parts. The differential expansion calculation uses an ambient temperature of 20℃ as a reference. A positive value is defined as the rotor expansion exceeding the static expansion. The differential expansion is calculated during steady-state, start-up, and shutdown processes, with the values ​​for start-up and shutdown serving as the basis for setting the dynamic-static clearance. With the development of steam turbine technology, high-power, long-span, cylinder- and dead-point steam turbine units are becoming increasingly widespread. The original differential expansion calculation did not consider the influence of ambient temperature during installation and operation. For some units, such as those with two or more low-pressure cylinders, long low-pressure cylinder spans, and low-pressure cylinders and their bearing housings being dead points, the steam turbine foundation experiences significant expansion or contraction under large ambient temperature changes, leading to discrepancies between the original calculated differential expansion and actual operation. Summary of the Invention

[0003] This invention overcomes the limitations of existing technologies by providing a method for calculating the influence of ambient temperature on turbine differential expansion. This method provides a theoretical basis for the axial clearance arrangement of the unit, ensuring that the axial clearance of the unit does not cause rubbing, thereby guaranteeing the safe and stable operation of the unit.

[0004] The calculation methods for the effect of ambient temperature on turbine differential expansion include:

[0005] S1. Set the ambient temperature and reference temperature. The minimum ambient temperature is 0℃ and the maximum temperature is 39℃. The reference temperature for the turbine body is 20℃.

[0006] S2. Calculation of total expansion due to ambient temperature: This involves calculating the expansion changes of the turbine body and foundation caused by the temperature difference from 0℃ to 39℃, and obtaining the total expansion L at the corresponding dead point location. i =l i -l ri +l Zi ;

[0007] Where i = 1, 2, 3…n represents the position of the expansion dead point.

[0008] l i The table corresponds to the base expansion amount obtained at the dead point.

[0009] l ri This indicates the rotor expansion amount obtained at the corresponding dead point.

[0010] l Zi This indicates the amount of expansion of the stationary component obtained at the corresponding dead point.

[0011] Furthermore, the calculation of the expansion change caused by the turbine temperature difference in step S2 includes the installation from a high-temperature environment to a low-temperature environment and the installation from a low-temperature environment to a high-temperature environment, thereby obtaining the actual expansion difference value during operation.

[0012] Furthermore, the sliding pin system in step S2, which combines the calculation of expansion changes caused by the turbine temperature difference, includes bearing housing #2, low-pressure cylinder #1, bearing housing #3, low-pressure cylinder #2, and bearing housing #4 connected in sequence. The dead point position of bearing housing #2 is defined as point 0, the dead point position of low-pressure cylinder #1 is point 1, the dead point position of bearing housing #3 is point 2, the dead point position of low-pressure cylinder #2 is point 3, and the dead point position of bearing housing #4 is point 4.

[0013] The advantages of this invention compared to the prior art are:

[0014] This invention proposes a specific algorithm for the expansion difference changes caused by turbine installation in high-temperature and low-temperature environments, improves the expansion difference calculation theory, provides a more accurate theoretical basis for setting axial dynamic and static clearances, better matches the actual expansion difference of turbine operation, better assists in turbine monitoring and operation, and ensures smooth unit startup and operation.

[0015] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments: Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a turbine sliding pin system that combines the calculation method of the influence of ambient temperature on turbine differential expansion of the present invention;

[0017] Figure 2 This is a diagram of a turbine sliding pin system according to an embodiment;

[0018] Figure 3 This is a comparison diagram of the expansion difference based on the ambient temperature and the reference temperature of the turbine body in the embodiment; where a represents the actual expansion difference of the turbine body when it is installed in a high-temperature environment and operated in a low-temperature environment; b represents the actual expansion difference of the turbine body when it is installed in a low-temperature environment and operated in a high-temperature environment. Detailed Implementation

[0019] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. Unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art.

[0020] Combination Figures 1-3 The calculation method for the effect of ambient temperature on turbine differential expansion includes:

[0021] S1. Set the ambient temperature and reference temperature. The minimum temperature is 0℃, the maximum temperature is 39℃, and the turbine body reference temperature is 20℃.

[0022] S2. Calculation of total expansion due to ambient temperature: This involves calculating the expansion changes of the turbine body (rotor and stationary components) and foundation caused by the temperature difference from 0℃ to 39℃, and obtaining the total expansion L at the corresponding dead point location. i =l i -l ri +l Zi This provides a basis for calculating the expansion difference of each flow stage.

[0023] Where i = 1, 2, 3…n represents the position of the expansion dead point.

[0024] l i The table corresponds to the base expansion amount obtained at the dead point.

[0025] l ri This indicates the rotor expansion amount obtained at the corresponding dead point.

[0026] l Zi This indicates the amount of expansion of the stationary component obtained at the corresponding dead point.

[0027] In this embodiment, the expansion calculation uses 20°C as the reference temperature. Therefore, the expansion of the turbine body will vary with the ambient temperature during installation. The calculation needs to consider both the foundation expansion and the expansion differences of the turbine body due to seasonal temperature changes during installation.

[0028] The ambient temperature range considered during installation is 0℃ to 39℃. The expansion difference calculation uses a turbine body reference temperature of 20℃. It calculates the expansion changes caused by the temperature difference between 0℃ and 20℃ and between 39℃ and 20℃ in the turbine body, and also calculates the expansion changes caused by the temperature difference of the foundation from 0℃ to 39℃ as a correction to the expansion difference results.

[0029] Specifically, step S2, the calculation of the expansion change caused by the turbine temperature difference, includes both installation in a high-temperature environment and operation in a low-temperature environment, and installation in a low-temperature environment and operation in a high-temperature environment, thereby obtaining the actual expansion difference value during operation.

[0030] Specifically, the sliding pin system in step S2, which combines the calculation of expansion changes caused by the turbine temperature difference, includes bearing housing #2, low-pressure cylinder #1, bearing housing #3, low-pressure cylinder #2, and bearing housing #4 connected in sequence. The dead point position of bearing housing #2 is defined as point 0, the dead point position of low-pressure cylinder #1 is point 1, the dead point position of bearing housing #3 is point 2, the dead point position of low-pressure cylinder #2 is point 3, and the dead point position of bearing housing #4 is point 4.

[0031] Furthermore, the calculation process for the expansion difference of a steam turbine installed in a high-temperature environment and then operating in a low-temperature environment is as follows:

[0032] 1) Installed in a high-temperature environment and operated in a low-temperature environment, with a maximum temperature of 39℃ and a minimum temperature of 0℃. The foundation is affected by the turbine body. When the ambient temperature is 0℃, the foundation temperature is increased by 9℃ as the calculation temperature.

[0033] The expansion of the high-temperature mounting foundation from the dead point of bearing housing #2 to the dead point of low-pressure cylinder #1 is denoted as l1.

[0034] l1 = p1 × k1 × (39 - (0 + 9));

[0035] Similarly, the amount of high-temperature foundation expansion from the dead point of bearing housing #2 to the dead point of bearing housing #3 is denoted as l2.

[0036] l2=(p1+p2)×k1×(39-(0+9));

[0037] The expansion of the high-temperature installation foundation from the dead point of bearing housing #2 to the dead point of low-pressure cylinder #2 is recorded as l3;

[0038] l3=(p1+p2+p3)×k1×(39-(0+9));

[0039] The amount of high-temperature installation foundation expansion from the dead point of bearing housing #2 to the dead point of bearing housing #4 is recorded as l4;

[0040] l4=(p1+p2+p3+p4)×k1×(39-(0+9)); where k1 is the basic expansion coefficient, and p1, p2, p3, p4 are the distances between point 0 and point 1, point 1 and point 2, point 2 and point 3, and point 3 and point 4, respectively.

[0041] 2) When the turbine is installed in a high-temperature environment and then moved to a low-temperature environment, with a maximum temperature of 39℃ and a reference temperature of 20℃, the expansion of the turbine rotor from the thrust bearing is recorded as l according to points 1 to 4. r1 ,l r2 ,l r3 ,l r4 ;

[0042] l r1 = (p1+Q)×k2×(39-20);

[0043] l r2 = (p1+p2+Q)×k2×(39-20);

[0044] l r2 =(p1+p2+p3+Q)×k2×(39-20);

[0045] lr2 = (p1+p2+p3+p4+Q)×k2×(39-20); where k2 is the rotor expansion coefficient;

[0046] 3) From high-temperature environment installation to low-temperature environment operation, from a maximum temperature of 39℃ to a rotor reference temperature of 20℃, the expansion of the stationary components of the turbine is as follows (points 1 to 4): l Z1 ,l Z2 ,l Z3 ,l Z4 The thrust bearing is located in bearing housing #2, and bearing housing #2 is a dead point. The distance between the thrust bearing and the dead point of bearing housing #2 is Q. k3 is the linear expansion coefficient of the stationary component.

[0047] l Z1 =l Z2 =l Z3 =l Z4 =Q×k3×(39-20);

[0048] The total expansion L when installed in a high-temperature environment and operating in a low-temperature environment i =l i -l ri +l Zi .

[0049] Furthermore, the calculation process for the expansion difference of a steam turbine installed in a low-temperature environment and then operating in a high-temperature environment is as follows:

[0050] 1) The installation environment is changed from low temperature environment to high temperature environment. The minimum temperature is 0℃ and the maximum temperature is 39℃. The foundation is affected by the steam turbine. When the ambient temperature is 39℃, the foundation temperature is increased by 4℃ as the calculation temperature.

[0051] The expansion of the turbine cryogenic installation foundation from the dead point of bearing housing #2 to the dead point of low-pressure cylinder #1 is denoted as l1.

[0052] l1 = p1 × k1 × ((39+4)-0);

[0053] Similarly, the expansion of the low-temperature installation foundation from the dead point of bearing housing #2 to the dead point of bearing housing #3 is denoted as l2.

[0054] l2=(p1+p2)×k1×((39+4)-0)

[0055] The expansion of the low-temperature installation foundation from the dead point of bearing housing #2 to the dead point of low-pressure cylinder #2 is recorded as l3;

[0056] l3=(p1+p2+p3)×k1×((39+4)-0);

[0057] The expansion of the low-temperature installation foundation from the dead point of bearing housing #2 to the dead point of bearing housing #4 is recorded as l4;

[0058] l4=(p1+p2+p3+p4)×k1×((39+4)-0); where k1 is the basic linear expansion coefficient, and p1, p2, p3, p4 are the distances between point 0 and point 1, point 1 and point 2, point 2 and point 3, and point 3 and point 4, respectively.

[0059] 2) From installation in a low-temperature environment to operation in a high-temperature environment, the minimum temperature is 0℃ to the rotor steady-state temperature of 20℃. The expansion of the turbine rotor from the thrust bearing is divided into points 1 to 4. r1 ,l r2 ,l r3 ,l r4 ;

[0060] l r1 = (p1+Q)×k2×(20-0);

[0061] l r2 = (p1+p2+Q)×k2×(20-0);

[0062] l r3 =(p1+p2+p3+Q)×k2×(20-0);

[0063] l r4 = (p1+p2+p3+p4+Q)×k2×(20-0); where k2 is the linear expansion coefficient of the rotor;

[0064] 3) From low-temperature installation to high-temperature operation, from a minimum temperature of 0℃ to a rotor steady-state temperature of 20℃, the expansion of the stationary components of the turbine is as follows (see points 1 to 4): l Z1 ,l Z2 ,l Z3 ,l Z4 The thrust bearing is located in bearing housing #2, and bearing housing #2 is a dead point. The distance between the thrust bearing and the dead point of bearing housing #2 is Q. k3 is the coefficient of linear expansion of the stationary component. At this time,

[0065] l Z1 =l Z2 =l Z3 =l Z4 =Q×k3×(20-0);

[0066] The total expansion L when installed in a low-temperature environment and operating in a high-temperature environment i =l i -l ri +l Zi .

[0067] Of the two implementation schemes described above, one is a feasible example.

[0068] Where k2 = 8.32 × 10 -6 ℃ -1 k1 = 10 × 10 -6 ℃ -1 , p1=6672mm, p2=6750mm, p3=6750mm, p4=6121mm.

[0069] The following examples further illustrate this point:

[0070] Taking the low-pressure section of a steam turbine as an example, the steam turbine in this embodiment is a 1000MW unit steam turbine, and the change in expansion difference from point 0 to point 4 under the influence of ambient temperature was calculated.

[0071] The basic coefficient of linear expansion is 10 × 10. -6 ℃ -1 The coefficient of linear expansion of the rotor is 8.32 × 10⁻⁶. -6 ℃ -1 The coefficient of linear expansion for stationary components is 11.71 × 10⁻⁶. -6 ℃ -1 .

[0072] 1. Calculations for steam turbine installation in high-temperature environments:

[0073] A certain steam turbine sliding pin system, such as Figure 2 As shown, since the dead point of the stationary part is located in bearing housing #2 and is roughly the same as the position of the thrust bearing, the foundation expansion of the turbine is calculated from the dead point position of bearing housing #2.

[0074] 1) When installing in a high-temperature environment, the maximum temperature is 39℃ and the minimum temperature is 0℃. The foundation is affected by the steam turbine. When the ambient temperature is 0℃, the foundation temperature is increased by 9℃ as the calculation temperature.

[0075] Expansion amount l1 of the turbine high-temperature installation foundation from the dead point of bearing housing #2 to the dead point of low-pressure cylinder #1 (point 0 to point 1).

[0076] l1 = 6672mm × 10 × 10 -6 ℃ -1 ×(39-(0+9))℃=2.0mm;

[0077] Similarly, the basic expansion amount l2 from the dead point of bearing housing #2 to the dead point of bearing housing #3 (point 0 to point 2).

[0078] l2 = (6672 + 6750) mm × 10 × 10 -6 ℃ -1 ×(39-(0+9))℃=4.03mm

[0079] Expansion of the turbine high-temperature installation foundation l3 from the dead point of bearing housing #2 to the dead point of low-pressure cylinder #2 (point 0 to point 3).

[0080] l3=(6672+6750+6750)mm×10×10 -6 ℃ -1 ×(39-(0+9))℃=6.05mm

[0081] Expansion of the turbine high-temperature installation foundation l4 from the dead point of bearing housing #2 to the dead point of bearing housing #4 (point 0 to point 4).

[0082] l4=(6672+6750+6750+6121)mm×10×10 -6 ℃ -1 ×(39-(0+9))℃=7.89mm

[0083] 2) During installation in a high-temperature environment, with a maximum temperature of 39℃, the turbine rotor will move from the thrust bearing to a steady-state temperature of 20℃. Figure 2 The expansion (starting from the left side) is divided into sections from point 1 to point 4. r1 -l r4 The Q value is small and will be ignored in this example.

[0084] l r1 = 6672mm × 8.32 × 10 -6 ℃ -1 ×(39-20)℃=1.09mm

[0085] Similarly, l r2 =2.12mm, l r3 =3.22mm, l r4 =4.24mm;

[0086] Among them, when the turbine rotor expands Figure 2 The No. 1 bearing housing on the right side is slidable, non-dead, and unaffected by the expansion of the foundation.

[0087] 3) When installing in a high-temperature environment, with a maximum temperature of 39℃ and a reference temperature of 20℃, the expansion of the stationary components of the turbine, such as the cylinder and bearing housing, should be divided into sections according to points 1 to 4. Z1 -l Z4 The thrust bearing is located in bearing housing #2, and bearing housing #2 is a dead point with a small Q value, which is ignored in this example. Therefore, the expansion of the stationary part at the dead point position is 0mm.

[0088] l Z1 =l Z2 =l Z3 =l Z4 =0

[0089] When installed in a high-temperature environment and then operated in a low-temperature environment, the foundation will shrink, increasing the positive expansion differential. Conversely, the turbine rotor will shrink under these conditions, decreasing the positive expansion differential; the cylinder's retraction will increase the positive expansion differential. Therefore, the total expansion L at each location from high-temperature installation to low-temperature operation... i =l i -l ri +l Zi

[0090] 2. Calculations for installing steam turbines in low-temperature environments

[0091] 1) When installing in a low-temperature environment, the minimum temperature is 0℃ and the maximum temperature is 39℃. The foundation is affected by the steam turbine. When the ambient temperature is 39℃, the foundation temperature is increased by 4℃ as the calculation temperature.

[0092] The expansion amount l1 of the low-temperature installation foundation from the dead point of bearing housing #2 to the dead point of low-pressure cylinder #1.

[0093] l1 = 6672mm × 10 × 10 -6 ℃ -1 ×((39+4)-0)℃=2.87mm,

[0094] Similarly, l2 = 5.77 mm, l3 = 8.67 mm, and l4 = 11.31 mm;

[0095] 2) When installing in a low-temperature environment, from a minimum temperature of 0℃ to a steady-state temperature of 20℃, the turbine rotor expansion is divided into points 1 to 4. r1 -l r4 The Q value is small and can be ignored in this example;

[0096] l r1 = 6672mm × 8.32 × 10 -6 ℃ -1 ×(20-0)℃=0.79mm;

[0097] l2=1.59mm, l3=2.38mm, l4=3.14mm;

[0098] 3) During low-temperature installation, the minimum temperature is 0℃, and the steady-state temperature is 20℃. The Q value is small and negligible in this example. The expansion at the dead point of the stationary part is 0mm, i.e., l Z1 =l Z2 =l Z3 =l Z4 =0.

[0099] When a turbine is installed in a low-temperature environment and then moved to a high-temperature environment, the foundation will expand. If the differential expansion is defined as the rotor's expansion exceeding its static expansion, then foundation expansion will reduce the positive differential expansion. The turbine rotor expands from a low-temperature to a high-temperature state, increasing the positive differential expansion. Cylinder expansion (if any) will decrease the positive differential expansion. The total expansion L at various points from high-temperature installation to low-temperature operation is... i =l i -l ri +l Zi .

[0100] Figure 3 The diagram shows a comparison of the expansion difference between a high-temperature environment during turbine installation and a low-temperature environment during operation; and between a low-temperature environment during installation and a high-temperature environment during operation. Based on the above implementation scheme, the following conclusions can be drawn:

[0101] 3. Summary of Results

[0102] The total expansion at all points affected by ambient temperature = base expansion - rotor expansion + static expansion, i.e., L i =l i -l ri +l Zi .

[0103]

[0104] As shown in the table above, a certain steam turbine was installed in a high-temperature environment but operated in a low-temperature environment, resulting in a maximum increase of 3.65 mm in positive expansion differential during operation. Conversely, the steam turbine was installed in a low-temperature environment but operated in a high-temperature environment, resulting in an increase of 8.16 mm in negative expansion differential during operation. Ambient temperature has a significant impact on the operating expansion differential of steam turbines with multiple dead points and large spans. Incorporating the influence of ambient temperature into the expansion differential calculation is crucial for the safe and stable operation of steam turbines.

[0105] The present invention has been disclosed above with reference to preferred embodiments, but it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention, and all such modifications or alterations shall still fall within the scope of the present invention.

Claims

1. A method for calculating the effect of ambient temperature on the differential expansion of a steam turbine, characterized in that: The method includes: S1. Set the ambient temperature and reference temperature. The minimum ambient temperature is 0℃ and the maximum temperature is 39℃. The reference temperature for the turbine body is 20℃. S2. Calculation of total expansion due to ambient temperature: This involves calculating the expansion changes of the turbine body and foundation caused by the temperature difference from 0℃ to 39℃, and obtaining the total expansion at the corresponding dead point location. ; in, =1,2,3…n, representing the position of the expansion dead point. This represents the base expansion amount obtained at the corresponding dead point. This indicates the rotor expansion amount obtained at the corresponding dead point. This indicates the amount of expansion of the stationary component obtained at the corresponding dead point; The expansion change caused by the temperature difference of the steam turbine in step S2 includes the operation from high temperature environment to low temperature environment and the operation from low temperature environment to high temperature environment, so as to obtain the actual expansion difference value during operation.

2. The calculation method for the influence of ambient temperature on turbine differential expansion according to claim 1, characterized in that: The sliding pin system in step S2, which combines the calculation of expansion changes caused by the turbine temperature difference, includes bearing housing #2, low-pressure cylinder #1, bearing housing #3, low-pressure cylinder #2, and bearing housing #4 connected in sequence. The dead point position of bearing housing #2 is defined as point 0, the dead point position of low-pressure cylinder #1 is point 1, the dead point position of bearing housing #3 is point 2, the dead point position of low-pressure cylinder #2 is point 3, and the dead point position of bearing housing #4 is point 4.

3. The calculation method for the influence of ambient temperature on turbine differential expansion according to claim 2, characterized in that: The calculation process for the differential expansion of a steam turbine installed in a high-temperature environment is as follows: 1) The high-temperature environment is installed and then operated in a low-temperature environment. The maximum temperature is 39℃ and the minimum temperature is 0℃. The foundation is affected by the steam turbine. When the ambient temperature is 0℃, the foundation temperature is increased by 9℃ as the calculation temperature. The expansion of the high-temperature installation foundation from the dead point of bearing housing #2 to the dead point of low-pressure cylinder #1 is denoted as... ; ； Similarly, the high-temperature foundation expansion from the dead point of bearing housing #2 to the dead point of bearing housing #3 is denoted as... ; ； The expansion of the high-temperature installation foundation from the dead point of bearing housing #2 to the dead point of low-pressure cylinder #2 is denoted as... ; ； The expansion of the installation foundation at high temperature from the dead point of bearing housing #2 to the dead point of bearing housing #4 is denoted as... ; ;in Based on the coefficient of linear expansion, , , , These are the distances between point 0 and point 1, point 1 and point 2, point 2 and point 3, and point 3 and point 4, respectively. 2) When the turbine is installed in a high-temperature environment and then moved to a low-temperature environment, with a maximum temperature of 39℃ and a reference temperature of 20℃, the expansion of the turbine rotor from the thrust bearing is recorded as follows: (Points 1 to 4 are not specified in the original text). ; ； ； ； ;in, is the coefficient of linear expansion of the rotor; 3) From high-temperature environment installation to low-temperature environment operation, from a maximum temperature of 39℃ to a rotor reference temperature of 20℃, the expansion of the stationary components of the turbine is as follows (points 1 to 4). The thrust bearing is located in bearing housing #2, and bearing housing #2 is a dead point. At this time: The dead point distance between the thrust bearing and bearing housing #2 is... , Let be the coefficient of linear expansion of a stationary component; then the total expansion amount when installed in a high-temperature environment and operating in a low-temperature environment. .

4. The calculation method for the influence of ambient temperature on turbine differential expansion according to claim 2, characterized in that: The calculation process for differential expansion of a steam turbine installed in a low-temperature environment is as follows: 1) When the equipment is installed in a low-temperature environment and then put into operation in a high-temperature environment, the minimum temperature is 0℃ and the maximum temperature is 39℃. The foundation is affected by the steam turbine. When the ambient temperature is 39℃, the foundation temperature is increased by 4℃ as the calculation temperature. The expansion of the turbine cryogenic installation foundation from the dead point of bearing housing #2 to the dead point of low-pressure cylinder #1 is denoted as... ; ； Similarly, the expansion of the low-temperature installation foundation from the dead point of bearing housing #2 to the dead point of bearing housing #3 is denoted as... ; The expansion of the cryogenic installation foundation from the dead point of bearing housing #2 to the dead point of low-pressure cylinder #2 is denoted as... ; ； The expansion of the low-temperature installation foundation from the dead point of bearing housing #2 to the dead point of bearing housing #4 is denoted as... ; ;in Based on the coefficient of linear expansion, , , , These are the distances between point 0 and point 1, point 1 and point 2, point 2 and point 3, and point 3 and point 4, respectively. 2) From installation in a low-temperature environment to operation in a high-temperature environment, from a minimum temperature of 0℃ to a rotor steady-state temperature of 20℃, the expansion of the turbine rotor starting from the thrust bearing is divided into points 1 to 4. ; ； ； ； ;in, is the coefficient of linear expansion of the rotor; 3) From installation in a low-temperature environment to operation in a high-temperature environment, from a minimum temperature of 0℃ to a rotor steady-state temperature of 20℃, the expansion of the stationary components of the turbine is as follows, according to points 1 to 4 respectively. The thrust bearing is located in bearing housing #2, and bearing housing #2 is a dead point. At this time: The dead point distance between the thrust bearing and bearing housing #2 is... , Let be the coefficient of linear expansion of a stationary component; then the total expansion amount when installed in a low-temperature environment and operating in a high-temperature environment. .

5. The calculation method for the influence of ambient temperature on turbine differential expansion according to claim 3 or 4, characterized in that: ， ， 。 6. The calculation method for the influence of ambient temperature on turbine differential expansion according to claim 5, characterized in that: =6672mm, =6750mm, =6750mm, =6121mm。

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