Boiler tower crane arrangement structure and method for coal-fired power generating unit in expansion project

Abstract

The application provides a tower crane arrangement structure and method for a boiler of a coal-fired power generating unit at an extension end, and the tower crane arrangement structure comprises: a tower crane located in a steel structure column network of the boiler at the extension end, the tower crane being located at one side of the steel structure column network of the boiler at the extension end close to an air preheater; and the standard section longitudinal and transverse center lines of the tower crane are respectively coincident with the unit frame center lines of the steel structure column network of the boiler at the extension end. The application solves the problem of mutual restriction of the hoisting machinery of the boiler of the coal-fired power generating unit at the extension end and the crossing construction of the coal conveying trestle, ensures that the construction of the coal conveying trestle at the extension end can be smoothly carried out without dismounting the hoisting machinery of the boiler at the extension end, and can more evenly promote the installation of the boiler at the extension end and the construction of the coal conveying trestle.

Description

Technical Field

[0001] This invention relates to the field of coal-fired power generation technology, and in particular to a boiler tower crane arrangement structure and method for an expanded coal-fired power generator unit. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] According to the conventional general layout of thermal power generating units, the main fixed lifting machinery for the boiler at the expansion end is located on the expansion end side. However, due to the close proximity of the coal conveyor trestle to the steel structure, this fixed lifting machinery will occupy the trestle's position, preventing the trestle from being completed before the fixed lifting machinery is removed. This will affect the installation of the belt conveyor and the joint commissioning and testing of the coal conveying system, significantly hindering the completion of the ignition and blowdown of the first unit's boiler. Therefore, the intersection of the fixed lifting machinery layout and trestle construction at the expansion end of the generating unit has always been a significant factor restricting the construction of the boiler at the expansion end of the new generating unit.

[0004] Typically, to meet the needs of commissioning and ignition blowing of the fixed-end unit, the expanded-end boiler needs to complete the hydrostatic test immediately after the fixed-end boiler in order to dismantle the lifting machinery of the expanded-end boiler, or to dismantle the lifting machinery of the expanded-end boiler in advance and bring in large mobile lifting machinery to create conditions for the connection of the trestle bridge, the installation of the belt conveyor, and the commissioning of the coal transportation system. However, the overall construction period is tight, resource input is increased, and the process is closely linked. If any link deviates, it will directly affect the commissioning of the fixed-end boiler, resulting in greater risks to the construction period and safety, and increased construction costs.

[0005] The inventors discovered that in current coal-fired power plant construction projects, when designing the coal loading layout for the expansion end of new units, the arrangement of the fixed lifting machinery for the boiler at the expansion end still adopts a conventional layout method, such as... Figure 1 As shown, the problem of the intersection between the fixed lifting machinery and the trestle construction of the boiler of the expanded end-side unit was not effectively avoided. For units with a double-sided coal bunker design, this problem involves a greater technical bottleneck and no effective solution has yet been formed. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a layout structure and method for a tower crane for a boiler in a coal-fired power generating unit at the expansion end. This solves the problem of mutual constraints between the boiler hoisting machinery and the coal conveying trestle during the overlapping construction of the coal-fired power generating unit at the expansion end. It ensures the smooth progress of the coal conveying trestle construction at the expansion end without dismantling the boiler hoisting machinery, and enables a more balanced and coordinated advancement of the boiler installation and coal conveying trestle construction at the expansion end.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The first aspect of the present invention provides a boiler tower crane layout structure for an expanded coal-fired power generating unit.

[0009] A tower crane arrangement structure for a coal-fired power generating unit boiler at an expansion end includes: a tower crane located within the steel structure column grid of the boiler at the expansion end, with the tower crane positioned on the side of the steel structure column grid of the boiler at the expansion end closer to the air preheater.

[0010] As an optional implementation, the longitudinal and transverse centerlines of the standard section of the tower crane coincide with the centerlines of the unit frames of the boiler steel structure column grid at the expansion end.

[0011] As an optional implementation, the central axis of the expanded end boiler is collinear with the central axis of the fixed end boiler.

[0012] As an optional implementation method, the tower crane's operating range covers the entire steel structure of the boiler at the expansion end.

[0013] As an optional implementation, the base of the tower crane has a cross-shaped structure.

[0014] As an optional implementation, a coal conveyor belt is provided at the front of both the fixed-end boiler and the expansion-end boiler, and the central axis of the coal conveyor belt is parallel to the central axis of the expansion-end boiler and the central axis of the fixed-end boiler, respectively.

[0015] As a further limitation, an expansion-end coal conveying trestle is provided on the side of the expansion-end boiler away from the fixed-end boiler.

[0016] As a further limitation, a coal bunker transfer station is set up at the junction of the coal conveyor trestle and the coal conveyor belt at the expansion end.

[0017] As a further limitation, the operating range of the tower crane covers the air supply room area.

[0018] The second aspect of the present invention provides a method for arranging the tower crane structure of the boiler of an expanded coal-fired power generator unit.

[0019] A method for arranging a boiler tower crane for an expanded coal-fired power generating unit, utilizing the boiler tower crane arrangement structure described in the first aspect of this invention, includes the following steps:

[0020] The crawler crane works in conjunction with the tower crane to lift the boiler's large girder. After the lifting of the boiler's large girder is completed, the crawler crane is moved to other work areas to carry out other operations.

[0021] The boiler steel structure and main and auxiliary equipment are hoisted using a tower crane arranged within the boiler column grid, which fully covers the boiler steel structure and main and auxiliary equipment.

[0022] After the tower crane operation is completed, a crawler crane is used to dismantle the tower crane.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. This invention innovatively proposes a layout structure and method for a tower crane for a coal-fired power generating unit boiler at the expansion end, avoiding the overlap between the boiler crane construction and the coal conveying trestle construction, solving the problem of restricting the overall connection and commissioning of the coal conveying system, effectively alleviating the schedule pressure of boiler construction, coal conveying system installation and commissioning at the expansion end, and promoting the overall progress of the project in a balanced manner. This invention demonstrates the safety, scientificity, rationality, convenience and economy of the invention.

[0025] 2. This invention innovatively proposes a layout structure and method for a tower crane for a coal-fired power generator unit boiler on the expansion end, which optimizes the construction organization to the greatest extent, improves the comprehensive utilization rate of lifting machinery, balances the project progress to the maximum extent, and reduces overlapping constraints.

[0026] 3. This invention innovatively proposes a tower crane layout structure and method for boilers in expanded coal-fired power generating units. The boiler large plate beams are subject to a higher load distribution during hoisting, which facilitates the selection of hoisting machinery and cost control. The tower crane's operating radius covers the area of ​​the blower room, meeting the hoisting requirements of equipment such as the flue gas duct before the dust collector and the low-temperature economizer. Most of the electrostatic precipitator area is within its coverage, which is conducive to the full utilization of the tower crane.

[0027] 4. This invention innovatively proposes a tower crane layout structure and method for boilers in coal-fired power generating units at the expansion end. For boiler hoisting in coal bunkers on both sides of the power generating unit, a targeted large-scale hoisting machinery layout scheme is proposed. The operating radius and area of ​​the tower crane can meet the hoisting needs of various boiler components. Using only one tower crane effectively solves the problem of large-scale machinery layout that restricts the construction of the coal conveying trestle at the expansion end, saving construction time, significant machinery and labor costs, and overall construction costs. Attached Figure Description

[0028] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0029] Figure 1 The location of the boiler tower crane for the coal-fired power generating unit in the conventional manner provided in the background art is shown.

[0030] Figure 2 This is a schematic diagram of the layout structure of the boiler tower crane of the coal-fired power generator unit at the expansion end of the present invention to avoid affecting the installation of the trestle bridge, as provided in Embodiment 1 of the present invention.

[0031] Figure 3 The "cross-shaped" external dimensions of the base structure for the boiler tower crane arrangement of the expanded coal-fired power generating unit provided in Embodiment 1 of the present invention avoid affecting the installation of the trestle bridge;

[0032] Figure 4 The arrangement of the tower crane for the boiler of the coal-fired power generating unit at the expansion end provided in Embodiment 1 of the present invention avoids affecting the installation of the trestle bridge. The tower crane and crawler crane work together to lift the station.

[0033] Figure 5 This is a schematic diagram of the working radius range of the economizer large ash hopper assembly for the boiler tower crane of the expanded coal-fired power generating unit provided in Embodiment 1 of the present invention, which avoids affecting the installation of the trestle.

[0034] Figure 6 This is a schematic diagram of the right wall water-cooled wall positioning operation radius for the boiler tower crane arrangement of the expanded coal-fired power generator unit in Embodiment 1 of the present invention to avoid affecting the installation of the trestle bridge.

[0035] Figure 7 This is a schematic diagram of the tower crane arrangement for the boiler of the coal-fired power generating unit at the expansion end of the present invention, which avoids affecting the installation of the trestle bridge.

[0036] Figure 8 This is a schematic diagram of the hoisting method for arranging the tower crane of the boiler of the coal-fired power generator unit at the expansion end to avoid affecting the installation of the trestle bridge, as provided in Embodiment 2 of the present invention. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0040] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0041] Example 1:

[0042] Embodiment 1 of the present invention provides a boiler tower crane layout structure for a coal-fired power generating unit at the expansion end. Based on the existing layout method of large lifting machinery for boilers at the expansion end of a coal-fired power generating unit, this design addresses the problems of restricting the cross-construction of coal conveying trestle and limiting the overall project progress. It solves the problem of mutual restriction between the boiler hoisting machinery and the coal conveying trestle construction at the expansion end, ensuring that the coal conveying trestle construction at the expansion end can be carried out smoothly without dismantling the boiler hoisting machinery, and promoting the balanced progress of boiler installation and coal conveying trestle construction at the expansion end.

[0043] This invention solves the problem of compressed utilization cycle of boiler machinery at the expansion end due to construction period pressure, saves resource input for boiler construction at the expansion end, rationally and optimally allocates hoisting machinery resources, makes full use of the planned hoisting machinery, and dismantles the boiler hoisting machinery at the expansion end after the coal conveying trestle construction at the expansion end is completed, thus saving the cost of bringing large hoisting machinery in and out of the site.

[0044] More specifically, such as Figure 2 As shown, the tower crane layout includes: a tower crane and a crawler crane responsible for hoisting large components such as boiler steel structure, heating surface, four major pipelines, boiler large plate beam, and economizer large ash hopper;

[0045] Tower cranes and crawler cranes worked together to lift the boiler's large girder. The remaining boiler steel structure and main and auxiliary equipment were all lifted into place by tower cranes. Crawler cranes were another large lifting machine that was organized to enter the site to select the optimal lifting load capacity and parameters for the overall lifting task.

[0046] The tower crane is arranged within the boiler steel structure column grid, located in the direction behind the coal bunker on the side of the boiler. The longitudinal and transverse center lines of the standard section of the tower crane coincide with the center line of the boiler column grid unit frame.

[0047] The tower crane is a detachable tower crane. After the construction of the boiler steel structure, main and auxiliary equipment, and coal conveying trestle is completed, the tower crane can be dismantled using a crawler crane, which facilitates the removal of the tower crane.

[0048] The tower crane frees up the trestle position that would otherwise be occupied by conventional methods, thus no longer restricting the construction of the coal conveying trestle. This alleviates the pressure of the short service life of large lifting machinery for the boiler at the expansion end. It also eliminates the need for slow-loading of belt conveyors, side coal bunkers, steel coal hoppers, and other equipment, which is conducive to the overall installation and commissioning of the coal transportation system and creates favorable conditions for the overall connection and commissioning of the coal transportation system.

[0049] Tower cranes can effectively cover the entire steel structure of the boiler and meet the hoisting requirements of the main plant steel structure and most of the steel structure of the coal bunker within the boiler area. For the small part of the main plant steel structure that cannot be covered, crawler cranes that lift the boiler's large plate beams can be used to complete the hoisting of that part of the steel structure.

[0050] More specifically, the tower crane is located on the side of the steel structure column grid of the expanded boiler that is close to the air preheater. The central axis of the expanded boiler is collinear with the central axis of the fixed boiler. The working range of the tower crane covers the entire steel structure of the expanded boiler and the blower room area.

[0051] The front side of the fixed-end boiler and the expansion-end boiler is equipped with a coal conveyor belt between the coal bunkers, and the central axis of the coal conveyor belt between the coal bunkers is parallel to the central axis of the expansion-end boiler and the central axis of the fixed-end boiler, respectively.

[0052] An expansion end coal conveying trestle is provided on the side of the boiler away from the fixed end boiler, and a coal bunker transfer station is provided at the junction of the expansion end coal conveying trestle and the coal conveying belt between the coal bunkers.

[0053] Compared with conventional layout and hoisting methods, the structure described in this invention can effectively alleviate the construction period pressure of projects such as the expanded end boiler, the expanded end coal conveying trestle, and the belt conveyor by 60 days, and alleviate the commissioning period pressure of the coal conveying system by 15 days after implementation.

[0054] Comparing the human resource deployment plans before and after the implementation of this invention, it can reduce the number of construction workers on site by approximately 382 during peak periods, reduce the man-hours of construction workers by 183,360 man-hours, reduce the man-hours of coal conveying system commissioning personnel by 3,360 man-hours during peak periods, and save 6.66 million yuan in construction and commissioning labor costs.

[0055] Comparing the plans for the entry of large machinery before and after the implementation of this invention, the load capacity and parameters of the crawler crane originally planned to be brought in far exceeded those of the existing crawler cranes after the implementation of the invention. Based on the plan, the service life of the large crawler crane was set at 22 months, which reduced the daily operating cost by RMB 4.158 million.

[0056] Because the boiler unit adopts a double-sided coal bunker layout, compared with the conventional layout, the tower crane attachment settings after the implementation of this invention avoid the need to modify the tower crane's attachment support arm and other components under the conventional layout. The use of standard clamping attachment and reinforcement support arm enhances the stability of the tower crane, and the tower crane no longer experiences a reduction in effective load, saving approximately 200,000 yuan.

[0057] The total savings in machinery operating costs, labor costs, large machinery entry and exit fees, and other construction expenses amounted to approximately 11.018 million yuan.

[0058] like Figure 3 As shown, the layout of the tower crane for the coal-fired power generator unit boiler at the expansion end avoids affecting the installation of the trestle bridge. The "cross" shaped base of the structure is designed to reduce space occupation and improve overall stability.

[0059] Figure 4 To avoid interfering with the installation of the coal conveyor bridge, the tower crane for the coal-fired power generating unit at the expansion end is arranged in a layout that coordinates the tower crane and crawler crane in the hoisting positions. Specifically, when the crawler crane is used in conjunction with the tower crane to hoist the large girder, the crawler crane is located inside the coal conveyor bridge at the expansion end and within the working range of the tower crane. After the large girder hoisting is completed, the crawler crane is located outside the coal conveyor belt between the coal bunkers for other hoisting operations.

[0060] Figure 5 The diagram shows the working radius of the economizer ash hopper assembly in the boiler of the expanded coal-fired power generating unit, designed to avoid affecting the installation of the trestle. The working radius of the tower crane completely covers the working radius of the economizer ash hopper assembly.

[0061] Figure 6 The diagram shows the working radius of the tower crane's arrangement to avoid affecting the installation of the trestle bridge, which is intended for the boiler of the expanded coal-fired power generating unit. The working radius of the tower crane completely covers the working radius of the water-cooled wall on the right side.

[0062] Figure 7 This is a schematic diagram of the tower crane arrangement for the boiler of the coal-fired power generation unit at the expansion end, provided in Embodiment 1 of the present invention, to avoid affecting the installation of the trestle. In this case, the crawler crane is located outside the coal conveying trestle at the expansion end, and the operating radius of the crawler crane covers the tower crane.

[0063] In this embodiment, the expansion end refers to the end that is planned to be expanded and lengthened according to development needs and land availability, where the existing factory building will be connected to the proposed construction section.

[0064] Thermal power generation generally refers to the process of using the heat energy generated by the combustion of combustibles to heat water, turning it into high-temperature, high-pressure steam, which then drives a turbine to power a generator. Generator sets that use combustibles as fuel are collectively referred to as thermal power generator sets.

[0065] Tower cranes, also known as tower hoists, originated in Western Europe. They are rotating cranes with a jib mounted on a tall tower. They offer a large working space and are mainly used for the vertical and horizontal transport of materials and the installation of building components in construction. They consist of three parts: a metal structure, a working mechanism, and an electrical system. The metal structure includes the tower, jib, and base. The main technical parameters of tower cranes include maximum lifting capacity, end load (lifting moment), maximum / minimum radius, maximum lifting height, structural type, luffing method, and tower cross-sectional dimensions. Fixed tower cranes are connected to the building at regular intervals by anchor rods, hence the name attached tower cranes. They use a tower extension device to allow the upper rotating part of the crane to increase in height as the building grows, and are used for high-rise building construction.

[0066] Coal conveyor bridges are generally made of steel structures, are erected in the air, and can be enclosed or open. They are equipped with conveyors for transporting coal and are an important part of coal mine surface buildings and power plant buildings.

[0067] The overall construction site layout refers to minimizing the construction land use and avoiding or minimizing the occupation of farmland while meeting construction needs. The construction site layout should be compact and reasonable; lifting machinery and various construction facilities should be arranged reasonably; construction roads should be scientifically planned to minimize transportation costs; and the construction area and site size should be scientifically determined to minimize cross-operations between professional trades.

[0068] A power plant boiler, also known as a "power plant boiler," refers to a medium-to-large-sized boiler in a power plant that provides a specified quantity and quality of steam to the steam turbine; it is one of the main thermal equipment in a thermal power plant.

[0069] Example 2:

[0070] like Figure 8 As shown, Embodiment 2 of the present invention provides an operation method for arranging the tower crane structure of the boiler of an expanded coal-fired power generating unit, including the following process:

[0071] Within the boiler steel structure column grid, a tower crane is arranged on the side of the expansion end, in the direction of the rear of the side coal bunker.

[0072] The crawler crane works in conjunction with the tower crane to lift the boiler's large girder. After the lifting of the boiler's large girder is completed, the crawler crane is moved to other work areas to carry out other operations.

[0073] Tower cranes, which are arranged within the boiler column grid and fully cover the boiler steel structure and main and auxiliary equipment, are used to complete the hoisting operations of the boiler steel structure, main and auxiliary equipment, and coal conveying trestle at the expansion end.

[0074] After the hoisting operations of the boiler steel structure, main and auxiliary equipment, and coal conveying trestle at the expansion end are completed, and the tower crane operation is completed, the tower crane is dismantled using a crawler crane.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A boiler tower crane arrangement structure for an expanded coal-fired power generating unit, characterized in that, This includes: a tower crane located within the steel structure column grid of the boiler at the expansion end; the tower crane is located on the side of the steel structure column grid of the boiler at the expansion end, closer to the air preheater, and positioned in the direction behind the coal bunker on the boiler side; the tower crane vacates the trestle position that would normally be occupied by the conventional method; The longitudinal and transverse centerlines of the standard section of the tower crane coincide with the centerlines of the unit frames of the boiler steel structure column grid at the expansion end, respectively. The tower crane is a detachable tower crane. After the construction of the boiler steel structure, main and auxiliary equipment, and coal conveying trestle is completed, the tower crane can be dismantled using a crawler crane, which facilitates the removal of the tower crane. The base of the tower crane has a cross-shaped structure.

2. The boiler tower crane layout structure of the expanded coal-fired power generating unit as described in claim 1, characterized in that, The central axis of the boiler at the expansion end is collinear with the central axis of the boiler at the fixed end.

3. The boiler tower crane layout structure of the expanded coal-fired power generating unit as described in claim 1, characterized in that, The tower crane's operating range covers the entire steel structure of the boiler at the expansion end.

4. The boiler tower crane layout structure of the expanded coal-fired power generating unit as described in claim 1, characterized in that, The front side of the fixed-end boiler and the expansion-end boiler is equipped with a coal conveyor belt between the coal bunkers, and the central axis of the coal conveyor belt between the coal bunkers is parallel to the central axis of the expansion-end boiler and the central axis of the fixed-end boiler, respectively.

5. The boiler tower crane layout structure of the expanded coal-fired power generating unit as described in claim 4, characterized in that, The expansion end boiler is equipped with a coal conveying trestle on the side away from the fixed end boiler.

6. The boiler tower crane layout structure of the expanded coal-fired power generating unit as described in claim 5, characterized in that, A coal transfer station is located at the junction of the coal conveyor trestle and the coal conveyor belt between the extended end and the coal bunker.

7. The boiler tower crane layout structure for the expanded coal-fired power generating unit as described in claim 5, characterized in that, The tower crane's operating range covers the area of ​​the air supply room.

8. A method for operating a tower crane arrangement structure for a coal-fired power generator unit boiler as described in any one of claims 1-7, characterized in that, Within the boiler steel structure column grid, a tower crane is arranged on the side of the expansion end, in the direction of the rear of the side coal bunker. The crawler crane works in conjunction with the tower crane to lift the boiler's large girder. After the lifting of the boiler's large girder is completed, the crawler crane is moved to other work areas to carry out other operations. The boiler steel structure and main and auxiliary equipment are hoisted using a tower crane arranged within the boiler column grid, which fully covers the boiler steel structure and main and auxiliary equipment. After the tower crane operation is completed, a crawler crane is used to dismantle the tower crane.

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