CN110319605B - Method for installing molten salt pipeline in light tower of 150MW tower type photo-thermal power station - Google Patents

Method for installing molten salt pipeline in light tower of 150MW tower type photo-thermal power station Download PDF

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CN110319605B
CN110319605B CN201910433342.5A CN201910433342A CN110319605B CN 110319605 B CN110319605 B CN 110319605B CN 201910433342 A CN201910433342 A CN 201910433342A CN 110319605 B CN110319605 B CN 110319605B
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pipeline
meters
molten salt
installation
installing
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CN110319605A (en
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代增丽
王文刚
王洪栋
周和军
张国立
郑志磊
王斌
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SEPCO3 Electric Power Construction Co Ltd
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SEPCO3 Electric Power Construction Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S60/00—Arrangements for storing heat collected by solar heat collectors
    • F24S60/30—Arrangements for storing heat collected by solar heat collectors storing heat in liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F24S80/30—Arrangements for connecting the fluid circuits of solar collectors with each other or with other components, e.g. pipe connections; Fluid distributing means, e.g. headers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers

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  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)

Abstract

The invention discloses a method for installing a molten salt pipeline in a light tower of a 150MW tower type photo-thermal power station, which comprises the following steps: the method comprises the following steps of preparing pipeline hoisting construction, performing molten salt pipeline pre-combination through software assistance, prefabricating a pipeline and a support hanger, installing the pipeline with the length of 150-190 meters, installing the pipeline below 150 meters and installing the pipeline with the length of 190-243 meters, solving the problem that the high altitude and narrow space in the optical tower are difficult to position, and efficiently completing the installation of the molten salt pipeline in the optical tower; the labor intensity of overhead operation and the investment of comprehensive cost are reduced, the working efficiency is improved, and the construction period is shortened.

Description

Method for installing molten salt pipeline in light tower of 150MW tower type photo-thermal power station
Technical Field
The invention belongs to the technical field of tower type photo-thermal power stations, relates to a pipeline installation method in a tower type photo-thermal power station light tower, and particularly relates to a fused salt pipeline installation method in a 150MW tower type photo-thermal power station light tower.
Background
The light tower is a core area of a heat collection system of the tower type photo-thermal power station, the fused salt pipeline in the light tower is used as a key channel for energy transmission, the installation of the fused salt pipeline in the light tower is finished with high quality and high efficiency, and the light tower plays a vital role in the whole power station. Because the internal construction of the light tower has the characteristics of narrow space, high-altitude operation, multiple cross construction and the like, and the pipeline installation in the light tower of the tower type photo-thermal power station is a relatively new subject at present in China and even in the world, and no mature installation experience is used for reference, the technical problem which needs to be solved urgently is how to realize the maximization of pipeline distribution, reduce the field high-altitude labor intensity and the safety risk, and safely and efficiently complete the installation of the fused salt pipeline in the light tower.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the method for installing the fused salt pipeline in the light tower of the 150MW tower type photo-thermal power station, and the pipeline is maximally combined under the condition of the three-dimensional simulated transportation and hoisting processes; the problem that the three-dimensional pipeline in the optical tower is difficult to install and position is solved by adopting the coordinate positioning of the total station; the invention has high efficiency and accuracy, solves the problem of difficult positioning at high altitude and in narrow space in the light tower, reduces the labor intensity of high altitude operation and the investment of comprehensive cost, improves the working efficiency and shortens the construction period.
In order to solve the technical problems, the invention adopts the technical scheme that:
the method for installing the molten salt pipeline in the light tower of the 150MW tower type photo-thermal power station comprises the following steps:
step one, preparation for pipeline hoisting construction
Formulating a field hoisting scheme: the number of layers and areas of a platform in the concrete cylinder body of the light tower are set to be 0-150 m area, 150-190 m area and 190-243 m area, and lifting equipment is arranged and installed on the platform of each area;
step two, pre-combining the molten salt pipelines by software assistance
The pipeline is maximally combined under the condition of having the condition through three-dimensional simulation of the processes of transportation, hoisting and inserting structures;
step three, prefabricating the pipeline and the supporting and hanging bracket
When the pipe sections are prefabricated and combined, lofting is firstly carried out, and the size error of the pipe fittings is corrected by prolonging or shortening the straight pipe sections; a fused salt pipeline gallows divide into root, tub of two kinds of forms according to a gallows structural style in the light tower, and a gallows root is divided into according to the effect when the combination: the pipeline support positioning device comprises a ground combined part, a pipeline support positioning part and a clearance adjusting part, wherein the ground combined part is subjected to blanking, combination and welding on the ground; the positioning part of the pipeline bracket is blanked on the ground, and the clearance adjusting part is blanked on the ground and is installed and welded on site;
step four, pipeline installation of 150-190 meters
After the construction of each layer of platform between 150 meters and 190 meters is finished, the pipeline installation is started, the installation and alignment of the inlet molten salt tank are finished according to the requirements of a drawing, and then the pipeline installation is carried out simultaneously in two steps by taking the inlet and the outlet of the inlet molten salt tank as starting points;
step five, pipeline installation below 150 meters
The pipeline construction scheme below 150 meters is installed from bottom to top, and the position of an upper platform installation support and hanger corresponding to the pipeline installation position is used as a hanging point to conduct pipeline installation from bottom to top;
and step six, mounting the pipeline between 190 meters and 243 meters.
Further, the step six is performed in a subsection mode:
and (3) installing pipelines from 190 meters to 207 meters: after the 207-meter platform is installed, firstly hanging a pipeline between 190 meters and 207 meters, and before a 190-meter platform scaffold is erected, completing installation of a pipeline support hanger on the 190-meter platform; the lower pipeline of the absorber is hung up and connected after the absorber is installed; after the construction of the pipeline at the upper part of the 190-meter platform and the support and hanger frame is finished, hanging the pipe sections around the area, and then hanging the hot molten salt main pipe;
and (3) installing a pipeline between 207 and 229 meters: the pipeline is constructed from bottom to top, and the installation principle is as follows: after the connecting pipeline at the upper part of the platform and the supporting and hanging frame are installed, hanging the pipeline at the upper part to set up a scaffold, and then installing the pipeline at the upper part; connecting a hot molten salt main pipe at the outlet of the molten salt tank after water pressure;
and (3) mounting a pipeline from 229 meters to 243 meters: a 229m outlet molten salt tank, a damper, an absorber and a protective cover are sequentially arranged; pouring a 243m concrete platform; installing an exhaust pipeline connected around the molten salt tank; after the heat absorber equipment is installed, installing a connecting pipe section of the heat absorber; and after the heat absorber connecting pipe is installed and welded, installing the heat absorber connecting pipe for exhausting.
Further, 6 layers of platforms are arranged in the concrete barrel body of the light tower, wherein the number of the platforms is 190m, 180m, 168m, 164m, 157m and 150 m; the steel structure with the height of more than 200m is 43m, the outer diameter is 15.5m, the inner diameter is 13.2m, and 5 layers of platforms are arranged, wherein the number of the layers is 243m, 229m, 221m, 207m and 200 m.
Furthermore, 2 hoisters with 10 tons arranged outside the 0m light tower are used for installing pipelines with the length of less than 150m, hoisting points are arranged on a truss on a 150m platform, and 2 hoisters with 3 tons are used for assisting in hoisting a pipeline supporting and hanging frame; hoisting the pipeline and the support and hanger material between 150 meters and 190 meters by using 1 10-ton winch arranged on a platform of 180 meters, wherein a hoisting point is arranged at the upper part of a main truss of the platform of 190 meters; and the pipeline in the area of 190-243 m is matched with a support and hanger material by using a 40-ton tower crane.
Furthermore, when the pipeline and the support and hanger are prefabricated, the gradient of each pipe section cannot be lower than 5.7 degrees.
Furthermore, when pipelines with the length of less than 150 meters are installed in the fifth step, the pipelines with the length of less than 150 meters are combined in a mode of integrally combining a support frame, positioning installation of the support is carried out through a coordinate point of the root of a support hanger of the pipeline, a design center line of the embedded part is marked when the position of the embedded part is rechecked, and the error of the coordinate of the embedded part is corrected by adjusting the root of the support hanger; when the pipeline is installed, the pipeline is positioned by measuring the corresponding size of the bracket and the pipeline.
Further, when the pipeline bracket is installed, firstly, a total station is used for rechecking the error of the embedded part on each layer of platform, a correct coordinate position is marked, and the error of the coordinates of the embedded part measured and the designed coordinates is analyzed through CAD software; and correcting the actual coordinate error of the embedded part through the root of the cutting support before installation.
Compared with the prior art, the invention has the advantages that:
1. molten salt pipelines in the light tower are pre-combined under the assistance of Navisvarks and AutoCAD software, and the pipelines are combined to the maximum extent under the condition of the conditions through three-dimensional simulation transportation and hoisting processes, so that the number of field mounting welded junctions is reduced, the labor intensity of high-altitude operation and the investment of comprehensive cost are reduced, the working efficiency is improved, and the construction period is shortened.
2. When the pipeline in the light tower is hoisted, hoisting machinery is reasonably arranged in three areas, so that the integral construction progress is effectively accelerated, the field work is rapidly unfolded without mutual influence after the field work has installation conditions, the construction efficiency is effectively improved, and the positive effect on the promotion of engineering is achieved.
3. Aiming at the problem of difficult installation and positioning of the three-dimensional pipeline in the light tower, the invention adopts the total station coordinate positioning, effectively solves the problems that the pipeline installation space in the light tower is limited and the conventional measurement cannot be implemented in the high-altitude and cross operation states, and improves the accuracy of pipeline positioning and the overall construction efficiency. Wherein, the pipeline installation of 150 meters below can not refer to the light tower wall and the maintenance platform to carry out the installation and the positioning of the pipeline at high altitude. Therefore, when the pipeline bracket is installed, the root of the bracket is installed by using a total station coordinate positioning method for supporting and hanging, and when the pipeline is installed, the root of the bracket is positioned by using the size corresponding to the bracket.
The method solves the problem that the high-altitude and narrow-space positioning in the light tower is difficult, and efficiently completes the installation of the fused salt pipeline in the light tower.
Detailed Description
The present invention will be further described with reference to the following examples.
The construction equipment (windlasses, total stations and the like) and materials adopted by the invention are all the prior art, the specific structural design is not repeated, and the structure and the installation and use method are well known to those skilled in the art.
The technological process of the method for installing the molten salt pipeline in the light tower of the 150MW tower type photo-thermal power station mainly comprises the following steps:
pipeline hoisting construction preparation → prefabrication of pipelines and supporting and hanging frames → installation of pipelines with the length of 150 meters to 190 meters → installation of pipelines below 150 meters → installation of pipelines with the length of 190 meters to 243 meters.
The specific operation steps are as follows:
firstly, preparation for pipeline hoisting construction
1. Formulating a field hoisting scheme: the number of layers and areas of the platform in the concrete barrel body of the light tower are set, and hoisting equipment is arranged and installed on the platform in each area.
6 layers of platforms are arranged in the concrete cylinder body of the light tower, wherein the number of the platforms is 190m, 180m, 168m, 164m, 157m and 150 m; the steel structure with the height of more than 200m is 43m, the outer diameter is 15.5m, the inner diameter is 13.2m, and 5 layers of platforms are arranged, wherein the number of the layers is 243m, 229m, 221m, 207m and 200 m. According to the above regional arrangement, in order to meet the hoisting requirement, the use of the pipeline installation hoisting equipment in the optical tower for improving the working efficiency is divided into three regions:
1) area 0 meters to 150 meters: two 10-ton winches are arranged outside the 0m light tower and used for hoisting pipelines below 150m, and hoisting points are arranged on a truss on a 150m platform; 2 supplementary hoist and mount pipeline gallows of 3 tons hoists.
2) Area 150 to 190 meters: the platform with 180 meters is provided with 1 winch with 10 tons, and the hoisting point is arranged at the upper part of the main truss of the platform with 190 meters and is used for hoisting pipeline materials in the area of 150 meters to 190 meters.
3) 190m to 243m area: and (3) installing pipelines at the upper parts of the platforms of the 190-243 m layers, and matching the pipelines and the supporting and hanging bracket materials with a 40-ton tower crane outside the light tower.
2. Piping diagram generation: the pipeline installation space is known by using the Navisvarks 3D graph, and the pipeline is assisted by the AutoCAD software, so that the condition that the size of the assembly exceeds the space range and the reworking is caused during field installation is avoided. Simultaneously, with pipeline combination size maximize, reduced the installation work load in the light tower.
According to the requirements of site progress and construction period, advanced planning is conducted, the appearance design of civil engineering and steel structure drawings is familiar to master, the hoisting scheme of each layer of platform and steel structure in the optical tower is known, the three-dimensional model diagram of the optical tower drawn by a design institute is utilized, and related information such as space between pipelines and structures in the optical tower is known through Navisvarks software. And the special parts use Navisthrocks and AutoCAD software to assist and simulate the transportation, hoisting and penetrating structural processes of the combined pipeline. The maximum combination of pipelines is guaranteed, the number of welding openings for overhead operation and installation at the upper part is reduced, and a welding piping diagram is compiled according to an ISO diagram.
During the piping diagram compilation, the complex three-dimensional marking dimension is simplified by using Navisvarks and AutoCAD software for assistance. And verifying through AutoCAD to simplify the two figures, verifying the dimension of the ISO icon, and verifying whether the coordinates of the lofting combined pipe section are consistent with the design coordinates, so as to avoid reworking caused by prefabrication errors. The combined pipeline is simulated and hoisted by Navisvarks software, so that reworking caused by improper combination during field installation of the pipeline is avoided.
According to the simulated hoisting result, the decomposition of the piping diagram and the fused salt pipeline system in the light tower is further optimized, and meanwhile, the transportation, hanging machinery, tools and installation resources are combed and integrated one by one.
Prefabrication of second, pipeline and a gallows
1. Pre-combining pipelines: before blanking, whether the required pipe elbow meets the design angle or not and whether the tee joint and the reducer meet the design requirements or not are rechecked according to the design size of a drawing. The 150mm excess material is additionally added to the pipeline connected with the equipment, so that the problem of mismatching in butt joint caused by the fact that the angle of the equipment connector is not consistent with the angle of the pipeline design is solved.
In order to ensure good fluidity of the molten salt pipeline, the gradient of each pipe section cannot be lower than 5.7 degrees. Therefore, when the pipe sections are prefabricated and combined, the pipe section should be firstly lofted, and the size error of the pipe fitting is corrected by lengthening or shortening the straight pipe section. The pipeline is checked and accepted after the butt joint combination, the relevant geometric dimension is measured, and meanwhile, the deformation prevention measure is adopted to control the occurrence of angle errors in the welding process.
2. Prefabricating a pipeline bracket: the support and hanger can be divided into two forms of a special support and hanger and a common support and hanger according to drawings and technical data. The special support and hanger is used for cold and hot molten salt pipelines and is provided with a support and hanger installation detailed diagram. The common pipeline bracket is suitable for small pipelines such as compressed air for instruments, emergency compressed air and the like.
A fused salt pipeline hanger in the light tower is divided into a root part form and a pipe part form according to a hanger structure form. The root part is composed of profile steel and a steel plate, and the pipe part is composed of a constant force spring hanger and a heat preservation pipe bracket. The root of the support hanger is classified and placed according to the material and the bracket number after cutting and blanking in the pre-combination process.
The root of the support hanger is divided into the following parts according to the action: ground combination part, pipeline support location part, clearance adjustment part. The ground combined part is subjected to blanking, combination and welding on the ground; blanking the positioning part of the pipeline bracket on the ground, and determining the requirements of combined welding and manufacturing according to the actual situation on site; the gap adjusting part is blanked on the ground and is installed and welded on site.
Pipeline installation of three, 150 to 190 meters
The hoisting scheme of the equipment and the pipeline in the area is determined by Navisthrocks software: and (3) starting to install pipelines after the construction of each layer of platform between 150 meters and 190 meters, and laying each layer of platform by using steel plates for protection to prevent high-altitude falling objects. The method comprises the steps of firstly completing installation and alignment of an inlet molten salt tank according to the requirements of a drawing, and then simultaneously performing pipeline installation in two grades by taking an inlet and an outlet of the inlet molten salt tank as starting points.
1. Selecting a pipeline hanging point: through simulation in the 3D picture, confirmed suitable pipeline and hung the point, guaranteed that the pipeline is once hung and is in place, avoided the secondary to transport.
2. Coordinate point identification of the pipeline: a plurality of coordinate reference points are marked on the wall of the light tower cylinder at about 1.5 meters above each floor platform by using a total station, and E, N, Z axis data is noted. The influence of the isolation steel plates and the scaffold on the positioning of the pipeline is reduced, and the construction efficiency is accelerated.
And 3, the coordinate data of the ISO drawing cannot be accurate to the coordinate data of each pipe section, so that the required coordinate data can be obtained by inquiring the 3D drawing during construction, and the field construction is facilitated.
Pipeline installation below four and 150 meters
The construction of pipelines below 150 meters of the light tower has large free surface and high danger coefficient, and the pipelines between 150 meters and 190 meters are hoisted from the formal passage and crossed, so the hoisting time is coordinated and better during construction. The pipeline construction scheme below 150 meters is installed from the bottom to the top, and the pipeline is installed from the bottom to the top by taking the position of the upper platform installation supporting hanger corresponding to the pipeline installation position as a hanging point.
The pipeline with the length of less than 150 meters is combined in a mode of integrally combining a support frame, the positioning installation of the support is positioned through a coordinate point of the root of a support hanger of the pipeline, the design center line of the embedded part is marked on the position of the embedded part for rechecking, and the error of the coordinate of the embedded part is corrected by adjusting the root of the support hanger; when the pipeline is installed, the pipeline is positioned by measuring the corresponding size of the bracket and the pipeline.
The pipeline at the lower part of the platform of 150 meters is hung in place before the maintenance platform of 1.146.5 meters is installed, so that the problem that the pipeline is difficult to insert due to the special condition of obstacle high altitude of the platform after the platform is installed is avoided.
2. And (5) installing the rest pipelines with the length of less than 150 meters after the maintenance platforms and the service platforms at the lower layers and the pipeline support rooted on the wall of the optical tower barrel are installed. When the pipeline support is installed, firstly, the total station is used for rechecking the error of the embedded part on each layer of platform, the correct coordinate position is marked, and the error of the coordinate of the embedded part measured actually and the designed coordinate is analyzed through CAD software.
The actual coordinate error of the embedded part is corrected by cutting the root of the support before installation, the accuracy of support installation is ensured, and the positioning is carried out according to the corresponding distance between the support and the pipeline during pipeline installation.
The support mounting sequence adopts the top-down construction, the north side and the south side are respectively provided with a winch and a suspension cage, and the suspension point is arranged at the upper part of a truss of a 150-meter platform. In order to reduce the labor intensity of high-altitude operation and facilitate the mounting and positioning of the bracket, the bracket frame structure is lofted and integrally welded during pre-assembly, and the inclined strut of the bracket adopts a pin shaft connection mode. After the support is positioned and adjusted, the upper part is welded, after the welding is finished, the suspension cage is lowered to the lower part of the inclined strut, the inclined strut of the support is lifted by the chain block, and then the inclined strut is welded.
3. Hoisting a pipeline: according to the internal space of the light tower, the pipeline is lifted by two lifting points, and the state of the vertical parallel distance of 8-9 meters is kept after the pipeline is lifted, so that the platform is prevented from being collided in the lifting process.
4. The scaffold required by pipeline installation is built by using a pipeline bracket as a bearing supporting point.
Pipeline installation of five, 190 to 243 meters
When the pipeline construction is carried out for more than 190 meters, a large amount of construction cross exists with a steel structure, a civil engineering sealing layer and an electric heating bridge frame. In order to reduce the influence of cross construction on pipeline installation, Navisvarks and AutoCAD software are used for formulating a molten salt pipeline prefabrication and installation scheme in advance.
1.190 m to 207m pipeline installation
After the 207m platform is installed, firstly hanging pipelines around 190m to 207 m; the pipe section connected with the absorber is firstly stored in a nearby platform, and the main pipeline is hung from the outer ring to the inner ring. Before the 190m platform scaffold is erected, the installation of a pipeline support hanger on the 190m platform is required to be completed firstly, and the influence on the installation of the support hanger on the 190m platform due to the erection of the scaffold is avoided.
The pipelines in the area are various, the pipeline at the lower part of the absorber is hung, and the pipeline is connected after the heat absorber is installed. And after the equipment is installed, the lower pipe section of the heat absorber is installed downwards from the interface of the equipment, and forced alignment is forbidden. The adjustment of the pipeline is carried out at the position of the transverse pipe section.
And when the heat absorber heating circulation transition section is installed, the installation coordinate position of each section of pipeline is ensured to be accurate. After the pipeline and the supporting and hanging frame on the upper portion of the 190-meter platform are constructed by the surrounding pipeline and the hot-melt salt mother pipe, the surrounding pipeline sections are hung firstly, then the hot-melt salt mother pipe is hung, and the phenomenon that the hoisting of the surrounding pipeline sections is affected after the hot-melt salt mother pipe is hung is avoided. This kind of mode effectively avoids scaffold frame repeated taking apart work.
Pipeline installation between 2.207 m and 229m
The pipeline installation between 207 meters and 229 meters also involves the cross operation between steel structure installation and pipeline installation, and the prefabricated large pipe section is firstly placed on the upper part of the finished platform before the adjacent upper platform is hoisted. And constructing the pipeline from bottom to top. The installation principle is as follows: after the connecting pipeline on the upper part of the platform and the supporting and hanging frame are installed, hanging the pipeline on the upper part to set up a scaffold, and then installing the pipeline on the upper part. And the outlet hot molten salt main pipe of the outlet molten salt tank is connected after water pressure.
3.229 m to 243m pipeline installation
The pipeline installation in the area is frequently crossed with other professional work, and the installation of a steel structure, a damper, a fused salt pipeline heat tracing cable and a protective cover is involved. Therefore, sufficient preparation work needs to be done to hold each installation node well while making reasonable installation procedures.
1) After the 229m outlet molten salt tank is installed, a main pipe at the inlet of the outlet molten salt tank is hoisted and hung on the upper part of a 229m platform main truss, and the molten salt tank is installed after the 243m platform is hoisted;
2) after the outlet molten salt tank is installed, installing a damper; and (4) arranging absorbers and protective covers in 360-degree division areas by other professional preparations outside the light tower steel structure.
3) Before the protective cover is installed, the absorber connecting pipes are all hung on the upper part of the steel structure, and after the hanging is finished, the protective cover starts to be constructed; at the same time the 243m concrete platform began to pour.
4) And after the 243m concrete is poured, constructing an exhaust pipeline connected around the molten salt tank, and handing over the next procedure to perform heat tracing cable construction after the hydraulic test is completed. The exhaust is divided into molten salt tank interface exhaust and absorber transition section exhaust according to pressure and installation time, and the final process of absorber connection pipe transition exhaust is installed as an adjusting section of an absorber connection pipe section. And exhausting gas from the upper part of the outlet molten salt tank, and installing the outlet molten salt tank after exhausting gas around the outlet molten salt tank.
5) After the heat absorber equipment is installed, the connecting pipe section of the heat absorber is installed, forced opening alignment of the pipe section is forbidden, and protective measures are taken during installation and welding to prevent damage to the heat absorber.
6) And after the installation and welding of the heat absorber connecting pipe are completed, installing the heat absorber connecting pipe for exhausting. (this part is used as an adjustment section, and when the pipe is prefabricated, the pipe section of this part is slightly extended)
7) When a pipeline between 229 meters and 243 meters is installed, because the concrete of the platform between 243 meters is poured, a 40-ton tower crane cannot be hoisted from the top, and materials are completely hoisted to the upper part before the concrete is poured, so that the material placement is disordered, a 3-ton hoist needs to be arranged on the platform between 210 meters, and the hoisting point is arranged at 229 meters, so that the hoisting device is used for hoisting support hanger materials and small-sized materials of scaffolds.
And (3) benefit analysis:
1. according to the invention, the molten salt pipeline in the light tower is subjected to pipe matching pre-combination by using Navisvarks and AutoCAD software, and the pipeline is combined to the maximum extent under the condition by three-dimensional simulation transportation and hoisting processes, so that the number of field installation welded junctions is reduced, and the prefabricated proportion of the main pipeline welded junctions reaches 67%. The labor intensity of high-altitude operation and the comprehensive investment cost are reduced. The prefabrication proportion of the welded junction below 150m is up to 74 percent; meanwhile, the installation position of the on-site welding opening is arranged near the maintenance platform, and a local scaffold erecting mode is adopted, so that the workload of erecting the scaffold is reduced by about 1.3 ten thousand cubic meters and about 285 ten thousand yuan.
2. The method effectively improves the installation accuracy by adopting coordinate positioning, and combines Navisthrocks and AutoCAD software to assist the piping, so that the piping accuracy of the pipeline is improved, and the defect that each field installation welded junction is prolonged by 150mm for field adjustment in order to ensure the gradient of the pipeline according to the technical requirements of drawing design is overcome. The workload of secondary cutting blanking and pipeline groove processing in the high-altitude operation state is reduced.
3. The method is applied to the installation of the pipeline of the light tower below 150 meters, the expected target can be fully completed within 62 days, and the planned construction period is advanced by 118 days compared with 180 days. The working efficiency is high, the installation period is shortened by about 21.5%, the comprehensive cost of installing the fused salt pipeline in the light tower is saved by about 32%, and the installation cost is about 480 ten thousand yuan, so that the method is favorable for popularization and use.
It is understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should understand that they can make various changes, modifications, additions and substitutions within the spirit and scope of the present invention.

Claims (6)

  1. The method for installing the molten salt pipeline in the light tower of the 1.150MW tower type photo-thermal power station is characterized by comprising the following steps of:
    step one, preparation for pipeline hoisting construction
    Formulating a field hoisting scheme: the method comprises the following steps of setting the number of layers of a platform in a concrete cylinder body of the light tower and a light tower area as 0-150 m area, 150-190 m area and 190-243 m area, and arranging and installing hoisting equipment on the platform of each area;
    step two, pre-combining the molten salt pipelines by software assistance
    The pipeline is maximally combined under the condition of having the condition through three-dimensional simulation of the processes of transportation, hoisting and inserting structures;
    step three, prefabricating the pipeline and the supporting and hanging bracket
    When the pipe sections are prefabricated and combined, lofting is firstly carried out, and the size error of the pipe fittings is corrected by prolonging or shortening the straight pipe sections; a fused salt pipeline gallows divide into root, tub of two kinds of forms according to a gallows structural style in the light tower, and a gallows root is divided into according to the effect when the combination: the pipeline support and hanger positioning part comprises a ground combined part, a pipeline support and hanger positioning part and a clearance adjusting part, wherein the ground combined part is blanked, combined and welded on the ground; blanking the positioning part of the pipeline supporting and hanging bracket on the ground, and blanking the clearance adjusting part on the ground and installing and welding the clearance adjusting part on the site;
    step four, pipeline installation of 150-190 meters
    After the construction of each layer of platform between 150 meters and 190 meters is finished, the pipeline installation is started, the installation and alignment of the inlet molten salt tank are finished according to the requirements of a drawing, and then the pipeline installation is carried out simultaneously in two steps by taking the inlet and the outlet of the inlet molten salt tank as starting points;
    step five, pipeline installation below 150 meters
    The pipeline construction scheme below 150 meters is installed from bottom to top, and the position of an upper platform installation support and hanger corresponding to the pipeline installation position is used as a hanging point to conduct pipeline installation from bottom to top;
    step six, mounting the pipeline between 190 meters and 243 meters, and performing the step six in sections:
    and (3) installing pipelines from 190 meters to 207 meters: after the 207-meter platform is installed, firstly hanging a pipeline between 190 meters and 207 meters, and before a 190-meter platform scaffold is erected, completing installation of a pipeline support hanger on the 190-meter platform; after the pipeline at the lower part of the heat absorber is hung, the heat absorber is connected after being installed; after the construction of the pipeline at the upper part of the 190-meter platform and the support and hanger frame is finished, hanging the pipe sections around the area, and then hanging the hot molten salt main pipe;
    and (3) installing a pipeline between 207 and 229 meters: the pipeline is constructed from bottom to top, and the installation principle is as follows: after the connecting pipeline at the upper part of the platform and the supporting and hanging frame are installed, hanging the pipeline at the upper part to set up a scaffold, and then installing the pipeline at the upper part; an outlet molten salt tank outlet hot molten salt main pipe is connected after water pressure;
    and (3) mounting a pipeline from 229 meters to 243 meters: a 229m outlet molten salt tank, a damper, a heat absorber and a protective cover are sequentially arranged; pouring a 243m concrete platform; an exhaust pipeline connected around the outlet molten salt tank is installed; after the heat absorber equipment is installed, installing a connecting pipe section of the heat absorber; and after the heat absorber connecting pipe section is installed and welded, exhausting the air in the heat absorber connecting pipe section.
  2. 2. The method for installing the molten salt pipeline in the light tower of the 150MW tower type photo-thermal power station as claimed in claim 1, wherein the method comprises the following steps: 6 layers of platforms are arranged in the concrete cylinder body of the light tower, wherein the number of the platforms is 190m, 180m, 168m, 164m, 157m and 150 m; the steel structure with the height of more than 200m is 43m, the outer diameter is 15.5m, the inner diameter is 13.2m, and 5 layers of platforms are arranged, wherein the number of the layers is 243m, 229m, 221m, 207m and 200 m.
  3. 3. The method for installing the molten salt pipeline in the light tower of the 150MW tower type photo-thermal power station as claimed in claim 2, wherein the method comprises the following steps: 2 10-ton winches arranged outside a 0-meter light tower are used for installing pipelines below 150 meters, hoisting points are arranged on a truss on a 150-meter platform, and 2 3-ton winches assist in hoisting pipeline supporting and hanging frames; hoisting the pipeline and the support and hanger material between 150 meters and 190 meters by using 1 10-ton winch arranged on a platform of 180 meters, wherein a hoisting point is arranged at the upper part of a main truss of the platform of 190 meters; and the pipeline in the area of 190-243 m is matched with a support and hanger material by using a 40-ton tower crane.
  4. 4. The method for installing the molten salt pipeline in the light tower of the 150MW tower type photo-thermal power station as claimed in claim 1, wherein the method comprises the following steps: when the pipeline and the support and hanger are prefabricated, the gradient of each pipe section cannot be lower than 5.7 degrees.
  5. 5. The method for installing the molten salt pipeline in the light tower of the 150MW tower type photo-thermal power station as claimed in claim 1, wherein the method comprises the following steps: when pipelines with the length of less than 150 meters are installed in the fifth step, the pipelines with the length of less than 150 meters are combined in a mode of integrally combining support and hanger frames, positioning installation of the support and hanger frames is carried out through coordinate points of the root parts of the support and hanger frames of the pipelines, the design center lines of the embedded parts are marked when the positions of the embedded parts are rechecked, and errors of the coordinates of the embedded parts are corrected through adjusting the root parts of the support and hanger frames; when the pipeline is installed, the pipeline is positioned by measuring the corresponding size of the supporting and hanging bracket and the pipeline.
  6. 6. The method for installing the molten salt pipeline in the light tower of the 150MW tower type photo-thermal power station as claimed in claim 5, wherein the method comprises the following steps: when the pipeline supporting and hanging bracket is installed, firstly, rechecking the error of the embedded part by using a total station on each layer of platform, marking out a correct coordinate position, and analyzing the error of the coordinate of the embedded part measured actually and the designed coordinate through CAD software; and correcting the actual coordinate error of the embedded part by cutting the root of the supporting and hanging bracket before installation.
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JPH0639661A (en) * 1992-07-23 1994-02-15 Komoda Kogyo:Kk Automatic prefabricated piping machining system and its equipment
JPH07244685A (en) * 1994-03-03 1995-09-19 Hitachi Plant Eng & Constr Co Ltd Piping spool designing method
EP2711487B1 (en) * 2012-09-19 2015-09-09 Alstom Technology Ltd Concentrated solar tower assembly and method
CN103218492A (en) * 2013-04-16 2013-07-24 上海上安机电设计事务所有限公司 BIM (Building Information Model)-based pipe prefabrication method
CN205980385U (en) * 2016-08-30 2017-02-22 中国电力工程顾问集团西北电力设计院有限公司 Tower solar energy light and heat power station heat absorption tower mixed structure
CN107256318B (en) * 2017-07-18 2023-04-18 中国电建集团河南工程有限公司 BIM technology-based boiler small pipeline construction method
CN108228967A (en) * 2017-12-06 2018-06-29 海门市设备安装工程有限公司 A kind of production of assembled pipeline based on BIM and mounting process

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