阅读说明：本技术 一种内缸独立支撑双弹性基础型汽轮机安装方法 (Installation method of double-elastic-base steam turbine with independently supported inner cylinder ) 是由 别国泰 余浩 薛彦春 陈亮 曹亮亮 赵勇 许准 柴广 王仁昌 于 2020-03-31 设计创作，主要内容包括：本发明属于汽轮机技术领域,具体涉及一种内缸独立支撑双弹性基础型汽轮机安装方法。本发明包括如下步骤：步骤一、先决条件检查；步骤二、低压缸正式扣盖；步骤三、第一次轴系中心和扬度测量；步骤四、基础弹簧释放和调整；步骤五、第二次轴系中心和扬度测量；步骤六、凝汽器注水至运行重量的70％；步骤七、凝汽器弹簧释放和调整；步骤八、低压缸与凝汽器焊接；步骤九、第三次轴系中心和扬度测量；步骤十、凝汽器弹簧测量和调整；步骤十一；凝汽器注水至100％运行重量；步骤十二、基础与凝汽器弹簧测量和调整；步骤十三、第四次轴系中心和扬度测量。本发明提高工作效率,消除施工过程中不稳定因素,降低一次重复揭扣缸工作涉及大件吊装的施工安全风险。(The invention belongs to the technical field of steam turbines, and particularly relates to an installation method of an inner cylinder independent support double-elastic foundation type steam turbine. The invention comprises the following steps: step one, checking prerequisites; secondly, formally buckling a cover of the low-pressure cylinder; step three, measuring the center and the raise degree of a shafting for the first time; step four, releasing and adjusting the basic spring; fifthly, measuring the center and the raise degree of a shafting for the second time; step six, injecting water into the condenser to 70% of the operation weight; step seven, releasing and adjusting a condenser spring; step eight, welding the low-pressure cylinder and a condenser; ninth, measuring the center and the raise degree of a third time shafting; step ten, measuring and adjusting a condenser spring; step eleven; injecting water into the condenser to 100 percent of the operation weight; step twelve, measuring and adjusting a foundation and a condenser spring; and thirteen, fourth time of shafting center and raise measurement. The invention improves the working efficiency, eliminates the unstable factors in the construction process, and reduces the construction safety risk related to the large part hoisting in one-time repeated uncovering and buckling cylinder work.)

1. An installation method of an inner cylinder independent support double-elastic foundation type steam turbine is characterized by comprising the following steps: the method comprises the following steps: step one, checking prerequisites; secondly, formally buckling a cover of the low-pressure cylinder; step three, measuring the center and the raise degree of a shafting for the first time; step four, releasing and adjusting the basic spring; fifthly, measuring the center and the raise degree of a shafting for the second time; step six, injecting water into the condenser to 70% of the operation weight; step seven, releasing and adjusting a condenser spring; step eight, welding the low-pressure cylinder and a condenser; ninth, measuring the center and the raise degree of a third time shafting; step ten, measuring and adjusting a condenser spring; step eleven; injecting water into the condenser to 100 percent of the operation weight; step twelve, measuring and adjusting a foundation and a condenser spring; and thirteen, fourth time of shafting center and raise measurement.

2. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 1, wherein: the first step comprises the following steps:

checking and installing records, checking and confirming that the shaft system center data, the shaft system raise degree data, the through-flow clearance data, the load distribution data and the like of the full-real cylinder of the steam turbine meet design specifications and standards, checking and confirming that a condenser is installed completely (the condenser is not welded with a low-pressure cylinder), a pipeline connected with a cylinder body is positioned and thrown and hung (not welded with the cylinder body), a high-pressure cylinder has formal cover buckling conditions after being installed, the lower half of the low-pressure inner cylinder and the lower half of the low-pressure outer cylinder are in place, and a base spring and a condenser spring are installed and are in a locking state.

3. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 2, wherein: the second step comprises the following steps:

installing a low-pressure inner and outer cylinder centering device; installing the exhaust steam guide ring on the low-pressure inner cylinder; cleaning a low-pressure inner lower cylinder, and positioning the lower half of a low-pressure stationary blade retaining ring, the lower half of a low-pressure steam chamber, the lower half of a low-pressure steam inlet guide ring and the lower half of a last three-stage stationary blade ring in sequence; positioning the lower half of the bearing bush, and mounting a measuring point and a wiring; hanging the steam seal corrugated joint at the end part of the low-pressure cylinder on the low-pressure rotor, and hoisting the low-pressure rotor to be in place; cleaning the lower half horizontal split surface of a low-pressure cylinder part sleeve, coating linseed oil, sequentially positioning the upper half of a steam inlet guide ring, the upper half of a low-pressure steam chamber, the upper half of a low-pressure stationary blade holding ring and the upper half of a last three-stage stationary blade ring, coating a high-temperature anti-seizure agent at the upper half thread of a split surface bolt, and fastening the split surface bolt of the low-pressure part sleeve by using a hydraulic wrench; cleaning the lower half middle split surface of the low-pressure inner cylinder, coating linseed oil, closing the upper half of the low-pressure inner cylinder, coating a high-temperature anti-biting agent on the upper half thread of the middle split surface bolt, and fastening the middle split surface bolt of the low-pressure inner cylinder by using a hydraulic wrench; dismantling the inner and outer cylinder centering devices; installing a guide rod, coating linseed oil on the horizontal flange surface of the low-pressure outer cylinder, combining the low-pressure outer upper cylinder, fastening a middle split bolt, fastening sequentially from the centers of two sides of the horizontal middle split surface of the outer cylinder body to corners, and fastening the front end and the rear end to the corners correspondingly from the shaft seal to the left and the right; and (5) fixing the disc moving rotor, and checking and confirming that no abnormal sound exists in the disc moving rotor.

4. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 3, wherein: the third step comprises the following steps:

and (3) driving the rotor, measuring the central data and the shafting raise data of the full-real cylinder shafting, and checking and confirming that the central data and the shafting raise data of the full-real cylinder shafting meet the design specifications and standards.

5. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 4, wherein: the fourth step comprises the following steps:

checking and confirming that the foundation load is balanced to the running load, releasing a base spring of the turbine, and adjusting the elevation of the foundation top plate to a designed value through the adjusting backing plate.

6. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 5, wherein: the fifth step comprises the following steps: and (3) driving the rotor, measuring the central data and the shafting raise data of the full-real cylinder shafting, and checking and confirming that the central data and the shafting raise data of the full-real cylinder shafting meet the design specifications and standards.

7. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 6, wherein: the sixth step comprises the following steps:

and connecting the external desalted water to a condenser interface by using a temporary pipeline, irrigating the condenser, and stopping irrigating when the total weight of the condenser reaches 70% of the operation weight.

8. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 7, wherein: the seventh step comprises the following steps:

and releasing the spring of the condenser, adjusting the throat elevation of the condenser to a design value by adjusting the base plate, and measuring and recording the height of the spring of the condenser.

9. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 8, wherein: the eighth step comprises the following steps:

erecting a plurality of dial indicators at the bottom of the low-pressure outer cylinder for monitoring the deformation of the low-pressure cylinder, stopping welding when the deformation at the monitoring point reaches the deformation limit value, and welding again after the deformation is recovered; four welders weld simultaneously, the range is bounded by horizontal and vertical median lines, the four welders weld clockwise in a segmented sequence, welding parameters are as small as possible, corners are in smooth transition, joints are staggered, and if a butt gap between a low-pressure cylinder and a condenser is too large, a welding lining plate is required to be used until welding deformation meets design specifications and standards.

10. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 9, wherein: the ninth step comprises the following steps:

re-centering the shaft system after welding: and (3) the rotor is driven to be coiled, the central data and the shafting raise degree data of the full-solid cylinder shafting are measured, the checking and the confirmation that the central data and the shafting raise degree data of the full-solid cylinder shafting meet the design specification and standard are carried out, the circumference is adjusted through a bearing gasket, and the opening is adjusted through a basic spring.

11. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 10, wherein: the step ten comprises the following steps:

and measuring the height of the spring of the condenser, and adjusting the height of the spring to the height before welding through an adjusting base plate.

12. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 11, wherein: the eleventh step comprises the following steps:

and (5) continuing to irrigate the condenser, and stopping irrigation when the total weight of the condenser reaches 100% of the operation weight.

13. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 12, wherein: the twelfth step includes the steps of:

and measuring the heights of the foundation spring and the condenser spring, and adjusting the elevation of the foundation top plate to a design value through an adjusting base plate.

14. The method of installing a double elastic base type steam turbine with independent inner casing support according to claim 13, wherein: the thirteen steps comprise the following steps:

step thirteen: and (3) driving the rotor, measuring the central data and the shafting raise data of the full-real cylinder shafting, and checking and confirming that the central data and the shafting raise data of the full-real cylinder shafting meet the design specifications and standards.

Technical Field

The invention belongs to the technical field of steam turbines, and particularly relates to an installation method of an inner cylinder independent support double-elastic foundation type steam turbine.

Background

The traditional steam turbine generally adopts the structural style that the inner cylinder of low pressure supports at the outer cylinder of low pressure, and traditional steam turbine equipment generally adopts rigid foundation structure, and one or two of steam turbine and condenser are installed simultaneously on rigid foundation promptly, and the outer cylinder of low pressure passes through expansion joint interconnect with the condenser, in traditional steam turbine equipment fixing process, all adopts traditional installation technology and method, promptly carries out the welded technology with the low pressure jar again under the condition of the earlier prebuckling jar of steam turbine low pressure jar promptly, carries out the low pressure jar after the welding completion and formally detains the jar again.

The low-pressure inner cylinder of a turbine of a certain nuclear power station unit is independent of the low-pressure outer cylinder and directly hung on the basis, the low-pressure outer cylinder is in rigid connection with a condenser through a transition section, turbine equipment adopts a double-elastic foundation structure, the turbine and the condenser are simultaneously installed on an elastic foundation, if a traditional installation process is adopted, then a foundation spring is released after the low-pressure cylinder is welded with the condenser, so that the total weight (about 800t per unit) of the red condenser in the basic lifting process can be borne by the low-pressure cylinder and the condenser welding seam, therefore, the risk of greatly influencing the quality of the welding seam exists, meanwhile, the welding seam size design of the low-pressure cylinder and the condenser reaches 3 × 2 × 10520 × 8760mm, the problem that the welding deformation amount exceeds the standard in different degrees when the welding construction is carried out on the same type of the turbine equipment is solved, and the problem.

The traditional installation process has the advantages that the number of low-pressure cylinder part sleeves is large, the weight is heavy, the size is large, the uncovering and buckling cylinder work relates to the construction safety risk of large hoisting, and the traditional installation process needs to carry out twice repeated uncovering and buckling cylinder work, so that the traditional installation process is long in construction period, complicated in construction process, multiple in unstable factors and large in construction risk, and more importantly, for double-elasticity basic type steam turbine equipment, the process has great risk of influencing the quality of welding seams.

Disclosure of Invention

The invention aims to provide an installation method of an inner cylinder independent support double-elastic foundation type steam turbine, aiming at the defects, on the premise of ensuring the installation quality of steam turbine equipment and the welding seam quality of a condenser, the construction process is simplified and optimized, the working efficiency is improved, the construction period is shortened, the unstable factors in the construction process are eliminated, and the construction safety risk related to large part hoisting in one-time repeated cylinder uncovering and buckling work is reduced.

The technical scheme adopted by the invention is as follows:

an installation method of an inner cylinder independent support double-elastic foundation type steam turbine comprises the following steps: step one, checking prerequisites; secondly, formally buckling a cover of the low-pressure cylinder; step three, measuring the center and the raise degree of a shafting for the first time; step four, releasing and adjusting the basic spring; fifthly, measuring the center and the raise degree of a shafting for the second time; step six, injecting water into the condenser to 70% of the operation weight; step seven, releasing and adjusting a condenser spring; step eight, welding the low-pressure cylinder and a condenser; ninth, measuring the center and the raise degree of a third time shafting; step ten, measuring and adjusting a condenser spring; step eleven; injecting water into the condenser to 100 percent of the operation weight; step twelve, measuring and adjusting a foundation and a condenser spring; and thirteen, fourth time of shafting center and raise measurement.

The first step comprises the following steps:

checking and installing records, checking and confirming that the shaft system center data, the shaft system raise degree data, the through-flow clearance data, the load distribution data and the like of the full-real cylinder of the steam turbine meet design specifications and standards, checking and confirming that a condenser is installed completely (the condenser is not welded with a low-pressure cylinder), a pipeline connected with a cylinder body is positioned and thrown and hung (not welded with the cylinder body), a high-pressure cylinder has formal cover buckling conditions after being installed, the lower half of the low-pressure inner cylinder and the lower half of the low-pressure outer cylinder are in place, and a base spring and a condenser spring are installed and are in a locking state.

The second step comprises the following steps:

installing a low-pressure inner and outer cylinder centering device; installing the exhaust steam guide ring on the low-pressure inner cylinder; cleaning a low-pressure inner lower cylinder, and positioning the lower half of a low-pressure stationary blade retaining ring, the lower half of a low-pressure steam chamber, the lower half of a low-pressure steam inlet guide ring and the lower half of a last three-stage stationary blade ring in sequence; positioning the lower half of the bearing bush, and mounting a measuring point and a wiring; hanging the steam seal corrugated joint at the end part of the low-pressure cylinder on the low-pressure rotor, and hoisting the low-pressure rotor to be in place; cleaning the lower half horizontal split surface of a low-pressure cylinder part sleeve, coating linseed oil, sequentially positioning the upper half of a steam inlet guide ring, the upper half of a low-pressure steam chamber, the upper half of a low-pressure stationary blade holding ring and the upper half of a last three-stage stationary blade ring, coating a high-temperature anti-seizure agent at the upper half thread of a split surface bolt, and fastening the split surface bolt of the low-pressure part sleeve by using a hydraulic wrench; cleaning the lower half middle split surface of the low-pressure inner cylinder, coating linseed oil, closing the upper half of the low-pressure inner cylinder, coating a high-temperature anti-biting agent on the upper half thread of the middle split surface bolt, and fastening the middle split surface bolt of the low-pressure inner cylinder by using a hydraulic wrench; dismantling the inner and outer cylinder centering devices; installing a guide rod, coating linseed oil on the horizontal flange surface of the low-pressure outer cylinder, combining the low-pressure outer upper cylinder, fastening a middle split bolt, fastening sequentially from the centers of two sides of the horizontal middle split surface of the outer cylinder body to corners, and fastening the front end and the rear end to the corners correspondingly from the shaft seal to the left and the right; and (5) fixing the disc moving rotor, and checking and confirming that no abnormal sound exists in the disc moving rotor.

The third step comprises the following steps:

and (3) driving the rotor, measuring the central data and the shafting raise data of the full-real cylinder shafting, and checking and confirming that the central data and the shafting raise data of the full-real cylinder shafting meet the design specifications and standards.

The fourth step comprises the following steps:

checking and confirming that the foundation load is balanced to the running load, releasing a base spring of the turbine, and adjusting the elevation of the foundation top plate to a designed value through the adjusting backing plate.

The fifth step comprises the following steps: and (3) driving the rotor, measuring the central data and the shafting raise data of the full-real cylinder shafting, and checking and confirming that the central data and the shafting raise data of the full-real cylinder shafting meet the design specifications and standards.

The sixth step comprises the following steps:

and connecting the external desalted water to a condenser interface by using a temporary pipeline, irrigating the condenser, and stopping irrigating when the total weight of the condenser reaches 70% of the operation weight.

The seventh step comprises the following steps:

and releasing the spring of the condenser, adjusting the throat elevation of the condenser to a design value by adjusting the base plate, and measuring and recording the height of the spring of the condenser.

The eighth step comprises the following steps:

erecting a plurality of dial indicators at the bottom of the low-pressure outer cylinder for monitoring the deformation of the low-pressure cylinder, stopping welding when the deformation at the monitoring point reaches the deformation limit value, and welding again after the deformation is recovered; four welders weld simultaneously, the range is bounded by horizontal and vertical median lines, the four welders weld clockwise in a segmented sequence, welding parameters are as small as possible, corners are in smooth transition, joints are staggered, and if a butt gap between a low-pressure cylinder and a condenser is too large, a welding lining plate is required to be used until welding deformation meets design specifications and standards.

The ninth step comprises the following steps:

re-centering the shaft system after welding: and (3) the rotor is driven to be coiled, the central data and the shafting raise degree data of the full-solid cylinder shafting are measured, the checking and the confirmation that the central data and the shafting raise degree data of the full-solid cylinder shafting meet the design specification and standard are carried out, the circumference is adjusted through a bearing gasket, and the opening is adjusted through a basic spring.

The step ten comprises the following steps:

and measuring the height of the spring of the condenser, and adjusting the height of the spring to the height before welding through an adjusting base plate.

The eleventh step comprises the following steps:

and (5) continuing to irrigate the condenser, and stopping irrigation when the total weight of the condenser reaches 100% of the operation weight.

The twelfth step includes the steps of:

and measuring the heights of the foundation spring and the condenser spring, and adjusting the elevation of the foundation top plate to a design value through an adjusting base plate.

The thirteen steps comprise the following steps:

step thirteen: and (3) driving the rotor, measuring the central data and the shafting raise data of the full-real cylinder shafting, and checking and confirming that the central data and the shafting raise data of the full-real cylinder shafting meet the design specifications and standards.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention provides a method for installing a double-elastic basic type steam turbine with an independent inner cylinder support, wherein the change of a steam turbine shafting center is controlled, the change control of the shafting center meets the design specification and standard requirements, and is obviously superior to other nuclear power turbines;

(2) the invention provides a method for mounting a double-elastic basic type steam turbine with an inner cylinder independently supported, wherein various parameters such as the vibration of the steam turbine, the temperature of a bearing and the like are obviously superior to design specifications and standards, and are obviously superior to other nuclear power steam turbines;

(3) the invention provides a method for mounting a double-elastic-base type steam turbine with an independent inner cylinder support.A condenser is controlled in welding deformation, meets the requirements of design specifications and standards, and is obviously superior to other nuclear power condensers;

(4) the invention provides an installation method of an inner cylinder independent support double-elastic foundation type steam turbine, which can effectively eliminate the risk that the quality of a welding seam is influenced because the whole weight of a condenser is born by the welding seam of a low-pressure cylinder and the condenser in the process of lifting a foundation due to the fact that a foundation spring is released after the low-pressure cylinder is welded with the condenser;

(5) compared with the traditional installation process, the installation method of the inner cylinder independent support double-elastic foundation type steam turbine has the advantages that the construction process is simplified and optimized, the repeated cylinder uncovering and buckling work is reduced, the working efficiency is improved, and the construction period is shortened;

(6) the invention provides an inner cylinder independent support double-elastic foundation type steam turbine and an installation method thereof, which can eliminate unstable factors in the construction process, reduce the construction safety risk related to large piece hoisting in one-time repeated cylinder uncovering work, and are more beneficial to the management and control of site safety;

(7) compared with the traditional installation process, the new installation process can save a large amount of manpower, material resources and financial resources for owner units, engineering units and construction units;

(8) the invention provides an installation method of an inner cylinder independent support double-elastic foundation type steam turbine, which has strong universality, can be widely popularized and applied to installation engineering of the same type of steam turbine equipment in the fields of nuclear power and conventional thermal power.

Drawings

FIG. 1 is a schematic structural view of an inner cylinder independent support double-elastic base type steam turbine;

FIG. 2 is a flow chart of an installation process of an inner cylinder independent support double-elastic basic type steam turbine;

wherein: 1-low pressure cylinder; 2-a foundation spring vibration isolator; 3, a condenser; 4-condenser spring vibration isolator.

Detailed Description

The method for installing the double-elastic base type steam turbine with the independent inner cylinder support provided by the invention is further described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, an inner cylinder independent support double-elasticity foundation type steam turbine comprises a low-pressure cylinder 1, a foundation spring vibration isolator 2, a condenser 3 and a condenser spring vibration isolator 4; the low-pressure cylinder 1 and the condenser 3 are rigidly connected together through a throat transition section in a welding mode, the foundation spring vibration isolator 2 is arranged and installed between a turbine foundation top plate and an upright post, and the condenser spring vibration isolator 4 is arranged and installed between the bottom of a condenser shell and a foundation bottom plate;

the low pressure cylinder 1 is one of the main components of the steam turbine, and is composed of a rotor and a stator. Taking a reaction steam turbine as an example, the rotor comprises rotating parts such as a moving blade, a rotating drum, a coupling and the like, and the stator comprises a cylinder, a steam inlet guide ring, a stationary blade holding ring, a steam exhaust guide ring, a steam seal, a bearing seat, a fastener and other fixed parts.

The condenser 3 is one of main auxiliary devices of the steam turbine, taking a water-cooled surface condenser as an example, the condenser mainly comprises a shell, an end cover, a throat part, a tube plate, a cooling water tube, a hot well and other parts.

As shown in fig. 2, the present invention provides a method for installing a double-elastic basic type steam turbine with an independent inner cylinder support, comprising the following steps:

the method comprises the following steps: checking and installing records, checking and confirming that the shaft system center data, the shaft system raise degree data, the through-flow clearance data, the load distribution data and the like of the full-real cylinder of the steam turbine meet design specifications and standards, checking and confirming that a condenser is installed completely (the condenser is not welded with a low-pressure cylinder), a pipeline connected with a cylinder body is positioned and thrown and hung (not welded with the cylinder body), a high-pressure cylinder has formal cover buckling conditions after being installed, the lower half of the low-pressure inner cylinder and the lower half of the low-pressure outer cylinder are in place, and a base spring and a condenser spring are installed and are in a locking state.

Step two: installing a low-pressure inner and outer cylinder centering device; installing the exhaust steam guide ring on the low-pressure inner cylinder; cleaning a low-pressure inner lower cylinder, and sequentially positioning a lower half (an electricity adjusting end) of a low-pressure stationary blade retaining ring, a lower half (an electricity adjusting end) of a low-pressure steam chamber, a lower half (an electricity adjusting end) of a low-pressure steam inlet guide ring and a lower half (an electricity adjusting end) of a last three-stage stationary blade ring; positioning the lower half of the bearing bush, and mounting a measuring point and a wiring; hanging the steam seal corrugated joint at the end part of the low-pressure cylinder on the low-pressure rotor, and hoisting the low-pressure rotor to be in place; cleaning the lower half horizontal split surface of a low-pressure cylinder part sleeve, smearing linseed oil, positioning the upper half of a steam inlet guide ring, the upper half (electric and adjusting ends) of a low-pressure steam chamber, the upper half (electric and adjusting ends) of a low-pressure static blade retaining ring and the upper half (electric and adjusting ends) of a last three-stage static blade ring in sequence, smearing a high-temperature anti-seizure agent at the upper half thread of a split surface bolt, and fastening the split surface bolt of the low-pressure part sleeve by using a hydraulic wrench; cleaning the lower half middle split surface of the low-pressure inner cylinder, coating linseed oil, closing the upper half of the low-pressure inner cylinder, coating a high-temperature anti-biting agent on the upper half thread of the middle split surface bolt, and fastening the middle split surface bolt of the low-pressure inner cylinder by using a hydraulic wrench; dismantling the inner and outer cylinder centering devices; installing a guide rod, coating linseed oil on the horizontal flange surface of the low-pressure outer cylinder, combining the low-pressure outer upper cylinder, fastening a middle split bolt, fastening sequentially from the centers of two sides of the horizontal middle split surface of the outer cylinder body to corners, and fastening the front end and the rear end to the corners correspondingly from the shaft seal to the left and the right; and (5) fixing the disc moving rotor, and checking and confirming that no abnormal sound exists in the disc moving rotor.

Step three: and (3) driving the rotor, measuring the central data and the shafting raise data of the full-real cylinder shafting, and checking and confirming that the central data and the shafting raise data of the full-real cylinder shafting meet the design specifications and standards.

Step four: checking and confirming that the foundation load is balanced to the running load, releasing a base spring of the turbine, and adjusting the elevation of the foundation top plate to a designed value through the adjusting backing plate.

Step five: and (3) driving the rotor, measuring the central data and the shafting raise data of the full-real cylinder shafting, and checking and confirming that the central data and the shafting raise data of the full-real cylinder shafting meet the design specifications and standards.

Step six: and connecting the external desalted water to a condenser interface by using a temporary pipeline, irrigating the condenser, and stopping irrigating when the total weight of the condenser reaches 70% of the operation weight.

Step seven: and releasing the spring of the condenser, adjusting the throat elevation of the condenser to a design value by adjusting the base plate, and measuring and recording the height of the spring of the condenser.

Step eight: and (3) welding a low-pressure cylinder with a condenser: erecting a plurality of dial indicators at the bottom of the low-pressure outer cylinder for monitoring the deformation of the low-pressure cylinder, stopping welding when the deformation at the monitoring point reaches the deformation limit value, and welding again after the deformation is recovered; four welders weld simultaneously, the range is bounded by horizontal and vertical median lines, the four welders weld clockwise in a segmented sequence, welding parameters are as small as possible, corners are in smooth transition, joints are staggered, and if a butt gap between a low-pressure cylinder and a condenser is too large, a welding lining plate is required to be used until welding deformation meets design specifications and standards.

Step nine: re-centering the shaft system after welding: and (3) the rotor is coiled, the central data and the shafting raise data of the full-solid cylinder shafting are measured, and the central data (the circumference is adjusted through a bearing gasket, the opening is adjusted through a basic spring) and the shafting raise data of the full-solid cylinder shafting are checked and confirmed to meet the design specifications and standards.

Step ten: and measuring the height of the spring of the condenser, and adjusting the height of the spring to the height before welding through an adjusting base plate.

Step eleven: and (5) continuing to irrigate the condenser, and stopping irrigation when the total weight of the condenser reaches 100% of the operation weight.

Step twelve: and measuring the heights of the foundation spring and the condenser spring, and adjusting the elevation of the foundation top plate to a design value through an adjusting base plate.

Step thirteen: and (3) driving the rotor, measuring the central data and the shafting raise data of the full-real cylinder shafting, and checking and confirming that the central data and the shafting raise data of the full-real cylinder shafting meet the design specifications and standards.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the technical scope of the present invention.