Installation method of power station peak regulation boiler water-cooled wall expansion measuring point

Abstract

The invention discloses an installation method of a power station peak regulation boiler water-cooled wall expansion measuring point, and relates to the technical field of boiler water-cooled wall engineering, in particular to the technical field of arrangement and installation of boiler water-cooled wall header expansion measuring points. The mounting method comprises the following steps of: leading an expansion test position of the water-cooled wall out of a furnace wall by using rigid leading-out channel steel, fixing a test point at the tail end of the rigid leading-out channel steel, and fixing the head end of the rigid leading-out channel steel and the expansion test position of the water-cooled wall. According to the installation method, the uncertainty in the installation process is remarkably reduced by designing a standardized installation support, clear operation steps and detection specifications, the installation method is more suitable for forming standard operation specifications, a unified standard can be provided for follow-up engineering, and the technical level and safety management of the whole industry are improved. The time cost and the labor cost are reduced, and the sustainable development of the boiler water cooling wall industry is promoted. The method is suitable for the deep peak regulation coal-fired thermal power generating unit with the capacity of 300 MW or above.

Description

Technical Field

[0001] The invention relates to the technical field of boiler water-cooled wall engineering, and in particular to the technical field of arrangement and installation of expansion measuring points of boiler water-cooled wall headers. Background Art

[0002] In the boiler system, the expansion characteristics of the water wall directly affect the safety and efficiency of the equipment. Correct installation of the boiler water wall header expansion measuring points is essential for real-time monitoring of the thermal expansion of the water wall, which can ensure the stable operation of the boiler under high temperature and high pressure environment. The accuracy of the installation not only affects the validity of the data, but also the reliability of the entire monitoring system. The boiler water wall header expansion measuring points can capture the expansion changes of the water wall during operation in real time and provide timely feedback on the equipment status. This enables operation and maintenance personnel to quickly identify potential problems and take necessary maintenance measures to avoid equipment failures and downtime, thereby improving the safety of the overall system.

[0003] At present, the expansion measurement points of water-cooled wall headers usually use traditional mechanical expansion indicators. However, the traditional mechanical expansion indicators have problems such as the dial is easily damaged and the expansion pointer is often stuck, which cannot reflect the actual expansion status of the boiler body and pipelines. In addition, there are a large number of traditional mechanical expansion indicators distributed on each floor of the unit, which requires a lot of work for inspection personnel to record. The inspection personnel visually read the dial data with large errors. In order to solve this problem, the existing technology has begun to use electronic sensors to replace mechanical expansion indicators.

[0004] There is no unified technical standard and technical requirement for the installation of existing expansion measuring points, nor is there an effective quality inspection method. The installation method of measuring points in the existing technology usually adopts first welding the installation bracket on the water-cooled wall header, then fixing the mechanical expansion indicator on the bracket, and finally installing a simple protective cover. Due to the lack of unified technical standards, the quality of the construction process cannot be controlled and is not easy to manage. Due to the low efficiency and high error of the installation method, the time cost and labor cost of the project are increased. Furthermore, the maintenance work of the existing installation method cannot be standardized, which will lead to increased maintenance work costs and even maintenance difficulties, often resulting in extended downtime of equipment during maintenance, further affecting the overall operating efficiency and economic benefits.

[0005] The current measurement point installation method does not have unified installation requirements, and the commonly used installation methods are not suitable for unified standardization regulations, resulting in uneven results in different engineering projects, affecting the reliability and performance of the monitoring system. Summary of the invention

[0006] In order to form a standard operating procedure for the installation and construction of water-cooled wall header expansion measuring points and reduce time and labor costs, the present invention proposes the following solutions:

[0007] A method for installing a water-cooled wall expansion measuring point of a peak-shaving boiler in a power station, the method comprising: using a rigid lead-out channel steel to lead the expansion test position of the water-cooled wall to the outside of the furnace wall, and fixing the measuring point at the end of the rigid lead-out channel steel, wherein the head end of the rigid lead-out channel steel is fixed to the water-cooled wall expansion test position.

[0008] Furthermore, a through hole is provided on the furnace wall, and the rigid lead-out channel steel passes through the through hole to lead the measuring point position out of the furnace wall, and the rigid lead-out channel steel cooperates with the through hole gap, and the gap is filled and sealed with a heat-insulating material.

[0009] Furthermore, the ratio of the length of the rigid lead-out channel steel extending outside the furnace wall to its length inside the furnace wall is between 1:5 and 1:4.

[0010] Furthermore, the water-cooled wall header is in a vertical relationship with the furnace wall of the boiler, and the installation method further comprises: fixing one end of the supporting reinforcement structure on the water-cooled wall header, and fixing the other end to the rigid lead-out channel steel.

[0011] Furthermore, the water-cooled wall header is parallel to the furnace wall of the boiler, and the installation method also includes: fixing the reinforcing plate on the header suspension ear plate, one end of two supporting reinforcing structures are respectively fixed on both sides of the rigid lead-out channel steel, and the other ends are respectively fixed on the reinforcing plate, one end of one supporting reinforcing structure is fixed on the lower side of the rigid lead-out channel steel, and the other end is fixed on the water-cooled wall header.

[0012] Furthermore, the two supporting reinforcement structures are arranged in a mirror image with the rigid lead-out channel steel as a reference, and the two supporting reinforcement structures and the reinforcement plate form an isosceles triangle, with the reinforcement plate being the base.

[0013] Furthermore, the supporting reinforcement structure is a channel steel with the same material and shape as the rigid lead-out channel steel.

[0014] Furthermore, the length of the rigid lead-out channel steel is 4-5 meters.

[0015] Furthermore, the measuring point is fixed to the end of the rigid lead-out channel steel by screw connection, and the head end of the rigid lead-out channel steel is fixed to the water-cooled wall by rigid connection.

[0016] Furthermore, the support reinforcement structure and the water-cooled wall header, and the support reinforcement structure and the rigid lead-out channel steel are fixed in the same manner, which are all welded or riveted.

[0017] Beneficial effects:

[0018] (1) The installation method of the present invention significantly reduces the uncertainty in the installation process by designing a standardized installation bracket, clear operating steps and testing specifications, is more suitable for forming a standard operating procedure, can provide a unified standard for subsequent projects, and improve the technical level and safety management of the entire industry.

[0019] (2) The installation method of the present invention can detect key parameters such as the position, angle, and strength of the rigid lead-out channel steel through conventional quality inspection means: for example, a laser locator can be used to ensure that the position and angle of the rigid lead-out channel steel meet the design requirements; a mechanical vibration tester can be used to verify the firmness of the connection between the supporting structure and the water-cooled wall header or the rigid lead-out channel steel to avoid loosening or displacement due to vibration.

[0020] (3) The installation method described in the present invention not only effectively overcomes the defects of the prior art, but also provides a reliable guarantee for the safe and efficient operation of the water-cooled wall, reduces time and labor costs, and promotes the sustainable development of the boiler water-cooled wall industry.

[0021] (4) The installation method described in the present invention is designed to adapt to the two structures of the water-cooled wall header and the boiler furnace wall, respectively, and fully considers the different characteristics of the specific structures of the water-cooled wall header and the boiler furnace wall, so that the installation method is more suitable for the actual situation and is more helpful to achieve the best installation effect under different engineering conditions, thereby improving the construction quality.

[0022] (5) The installation method described in the present invention adopts a support reinforcement structure, which can effectively disperse and resist external loads, enhance the stability of the support structure, and thus ensure the accuracy of measurement point detection. Furthermore, this support structure has strong seismic resistance and can ensure that the potential failures caused by fatigue or deformation of the measurement point are minimized during long-term use.

[0023] (6) The installation method described in the present invention uses a rigid lead-out channel steel as the main support component of the measuring point, and limits its length to 4-5 meters, that is, limiting the standard length of the support structure, which helps to standardize the design and simplify the production and construction process. This specific requirement can ensure the consistency of the supporting structure of the measuring point, thereby ensuring the consistency of the detection performance of all measuring points.

[0024] (7) The installation method described in the present invention connects the reinforcing structure of the support to form an isosceles triangle, which significantly enhances the force-bearing performance and bending resistance of the support structure, can reduce the influence of deformation or vibration of the water-cooled wall header during the measurement process, ensure the stability of the support structure, and then ensure the stability of the measuring point, effectively avoid the risk of measuring point failure due to the support structure, and ensure the safety of long-term operation.

[0025] (8) The installation method of the present invention can be connected by welding or riveting between the support reinforcement structure and the water wall header, and between the support reinforcement structure and the rigid lead-out channel steel, which provides greater flexibility and adapts to different construction conditions and material selection. This flexibility can not only improve installation efficiency, but also enhance the durability and reliability of the overall structure.

[0026] This method is applicable to deep peak-shaving coal-fired power units with a capacity of 300MW and above. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the installation state of a measuring point when the water-cooled wall header is perpendicular to the furnace wall of the boiler in the first embodiment. Figure numerals: furnace wall 1, water-cooled wall header 2, header hanging lug plate 3, support reinforcement structure 4, rigid lead-out channel steel 5, measuring point 7.

[0028] Figure 2 It is described in the first embodiment Figure 1 Top view of the .

[0029] Figure 3 It is a schematic diagram of the installation state of a measuring point when the water-cooled wall header is parallel to the furnace wall of the boiler in the first embodiment.

[0030] Figure 4 It is described in the first embodiment Figure 3 Top view of the . DETAILED DESCRIPTION

[0031] Implementation Method 1

[0032] Combined with Figure 1-4 The present embodiment is described as a method for installing expansion measuring points of a water-cooled wall of a peak-shaving boiler in a power station. The installation method is as follows: a rigid lead-out channel steel 5 is used to lead the expansion test position of the water-cooled wall to the outside of the furnace wall 1, and a measuring point 7 is fixed at the end of the rigid lead-out channel steel 5, and the head end of the rigid lead-out channel steel 5 is fixed to the water-cooled wall expansion test position.

[0033] By using rigid lead-out channel steel to lead the measuring point outside the furnace wall, it can be ensured that the measuring point will not be affected by factors such as temperature changes and boiler expansion during installation, thereby improving measurement accuracy and stability.

[0034] The measuring point is fixed at the end of the rigid lead-out channel steel, which can avoid interference from the high temperature and vibration of the internal environment of the boiler on the measuring point and ensure the accuracy of the data.

[0035] Implementation Method 2

[0036] The present embodiment is a further limitation of the method for installing expansion measuring points of a water-cooled wall of a peak-shaving boiler in a power station described in the first embodiment. Furthermore, a through hole is provided on the furnace wall 1, and the rigid lead-out channel steel 5 passes through the through hole to lead the measuring point position out of the furnace wall 1, and the rigid lead-out channel steel 5 cooperates with the gap of the through hole, and the gap is filled and sealed with a thermal insulation material.

[0037] The insulation material filling and sealing effectively prevents the high-temperature gas or particles in the furnace from leaking out of the furnace, reduces the interference of temperature fluctuations on the measuring point signal, ensures the stability of the data, and reduces the material aging problem caused by long-term high-temperature environment.

[0038] Implementation Method 3

[0039] This embodiment further limits the installation method of the water-cooled wall expansion measuring point of the peak-shaving boiler in a power station described in Embodiment 1. Furthermore, the ratio of the length of the rigid lead-out channel steel 5 extending outside the furnace wall 1 to its length inside the furnace wall 1 is between 1:5 and 1:4.

[0040] The longer rigid lead-out channel steel inside the furnace wall can effectively share the thermal expansion caused by temperature changes, and the shorter rigid lead-out channel steel outside the furnace wall can reduce the displacement or deformation of the external channel steel caused by expansion. This design is conducive to controlling the stress concentration caused by temperature difference and avoiding excessive external force concentration.

[0041] Since the rigid lead-out channel steel outside the furnace wall is shorter, it is less affected by external environmental factors such as wind and vibration, which helps to maintain the stability of the measuring point and avoid external factors affecting the measurement accuracy.

[0042] Implementation Method 4

[0043] This embodiment further limits the installation method of the water-cooled wall expansion measuring point of the peak-shaving boiler in a power station described in Embodiment 1. Furthermore, the water-cooled wall header is vertically related to the furnace wall of the boiler. The installation method also includes: fixing one end of the supporting reinforcement structure 4 on the water-cooled wall header 2, and fixing the other end to the rigid lead-out channel steel 5.

[0044] By fixing one end of the support reinforcement structure 4 to the water-cooled wall header 2 and connecting the other end to the rigid lead-out channel steel 5, the stability and durability of the structure are effectively enhanced. The support structure provides additional support force, which can share external stress, avoid the impact of thermal expansion and vibration on the structure, and ensure a firm connection between the water-cooled wall header and the channel steel, thereby improving the seismic resistance and long-term stability of the equipment. In addition, the design ensures the precise fixation of the measuring point position, avoiding data errors caused by unstable brackets or installation deviations. The support reinforcement structure also simplifies the installation process, improves maintenance convenience, and reduces the need for frequent maintenance.

[0045] Implementation Method 5

[0046] The present embodiment is a further limitation of the installation method of the water-cooled wall expansion measuring point of the peak-shaving boiler in a power station described in the first embodiment. Furthermore, the water-cooled wall header is parallel to the furnace wall of the boiler. The installation method also includes: fixing the reinforcing plate 6 on the header suspension ear plate 3, one end of the two supporting reinforcing structures 4 are respectively fixed on both sides of the rigid lead-out channel steel 5, and the other ends are respectively fixed on the reinforcing plate 6, one end of one supporting reinforcing structure 4 is fixed on the lower side of the rigid lead-out channel steel 5, and the other end is fixed on the water-cooled wall header 2.

[0047] The reinforcement plate 6 is fixed on the header suspension ear plate 3, providing additional support and ensuring the stability of the header. The support reinforcement structure is fixed on both sides and the bottom of the rigid lead-out channel steel, effectively sharing the stress from external factors such as high temperature and vibration, and preventing the structure from deformation or loosening. By connecting the support structure to the water-cooled wall header, the seismic resistance and durability of the structure are further enhanced. This structure optimizes the installation process, reduces human deviation, and improves the overall installation efficiency.

[0048] Furthermore, the two supporting reinforcement structures 4 are arranged with the rigid lead-out channel steel 5 as a reference mirror image, and the two supporting reinforcement structures 4 and the reinforcement plate 6 form an isosceles triangle, with the reinforcement plate 6 being the base.

[0049] By arranging the two supporting reinforcement structures with the rigid lead-out channel steel as a reference mirror image and forming an isosceles triangle structure with the reinforcement plate, the stability and compressive resistance of the overall structure are significantly improved. The isosceles triangle layout makes the force more uniform, reduces deformation or loosening caused by unbalanced stress, and enhances the seismic resistance and durability of the structure. The reinforcement plate, as the bottom edge, provides strong support, shares the pressure of the upper structure, and effectively prevents the equipment from shifting under high temperature and high pressure conditions.

[0050] Furthermore, the supporting reinforcement structure 4 is a channel steel with the same material and shape as the rigid lead-out channel steel 5 .

[0051] By using the same material and specification of the support reinforcement structure as the rigid lead-out channel steel, the stability and reliability of the overall structure can be further improved. The use of the same material channel steel ensures that the support reinforcement structure and the rigid lead-out channel steel have similar thermal expansion characteristics, avoiding stress concentration and deformation caused by different materials, and ensuring the long-term stability of the structure under high temperature and high pressure environments. The same specification of channel steel ensures uniform force, further enhancing the compressive strength and durability of the support structure. This design reduces the interface problems between different materials, making installation and maintenance easier, while improving the integration of the bracket. In addition, the use of the same material and specification of channel steel also simplifies the material selection and construction process, reducing costs.

[0052] Implementation Method 6

[0053] This embodiment further limits the installation method of the water-cooled wall expansion measuring point of the peak-shaving boiler in a power station described in the first embodiment. Furthermore, the length of the rigid lead-out channel steel 5 is 4-5 meters.

[0054] The uniform length of the channel steel facilitates mass production, reduces the need for cutting and processing of different specifications during the manufacturing process, and reduces production costs. The standardized length of the channel steel ensures that the materials used in various engineering projects are consistent, avoids installation deviations or quality problems caused by different lengths, and improves the efficiency of material management. Secondly, the use of uniform length channel steel helps to standardize the construction process and ensure the consistency of installation methods and construction processes in various projects. Construction personnel can quickly assemble according to the standardized length, shorten the construction period, and reduce the possibility of adjustments and re-construction required due to length discrepancies, reducing labor costs during construction. Unified standards can improve the effect of construction quality control, reduce quality problems caused by inconsistent materials and sizes, ensure the stability and safety of the entire structure, and help improve the overall benefits and controllability of the project.

[0055] Implementation Method 7

[0056] The present embodiment is a further limitation of the installation method of the water-cooled wall expansion measuring point of the peak-shaving boiler in a power station described in the first embodiment. Furthermore, the measuring point 7 is fixed to the end of the rigid lead-out channel steel 5 by screw connection, and the head end of the rigid lead-out channel steel 5 is fixed to the water-cooled wall by rigid connection.

[0057] The screw connection provides flexibility, allowing the measuring point to be accurately adjusted during installation, which is convenient for installation and later adjustment. The screw connection also facilitates the firm fixation between the measuring point and the channel steel, reducing the loosening problem caused by thermal expansion or vibration. Secondly, the rigid connection at the first end ensures the firm connection between the measuring point and the channel steel, enhances the stability and seismic resistance of the structure, avoids loosening or displacement caused by external forces, and improves the compressive resistance of the overall structure. In addition, the combination of screw connection and rigid connection makes maintenance and repair work easier, especially when the measuring point needs to be replaced or adjusted, it can be quickly disassembled and reinstalled.

[0058] Implementation Method 8

[0059] This embodiment is a further limitation of the installation method of the water-cooled wall expansion measuring point of the peak-shaving boiler in a power station described in Embodiment 1. Furthermore, the fixing method of the support reinforcement structure 4 and the water-cooled wall header 2, and the support reinforcement structure 4 and the rigid lead-out channel steel 5 are the same, which are all welding or riveting.

[0060] First of all, welding provides a permanent connection to ensure the stability and safety of the structure, and is particularly suitable for fixing requirements that require high strength and long-term stability. For equipment used in high temperature and high pressure environments, welding can avoid loosening problems caused by vibration or thermal expansion and ensure a firm connection. On the other hand, riveting has better flexibility and can be completed without high temperature operation. For some situations that may require disassembly and reassembly, riveting provides a more convenient processing method, which is convenient for later maintenance and replacement of parts. The combination of the two can be flexibly selected according to actual needs, providing different degrees of structural strength and maintenance convenience. In practical applications, welding can be used for parts that require strong permanent connections, while riveting is suitable for parts that need to be easily disassembled, replaced or adjusted. This combination design effectively improves the flexibility and construction efficiency of installation, and also provides a convenient option for later maintenance and adjustment.

[0061] Implementation Method 9

[0062] This implementation is illustrated by combining specific application scenarios. 2. A method for installing expansion measuring points of a water-cooled wall of a peak-shaving boiler in a power station. The method is as follows:

[0063] A high-temperature steam environment of 500°C circulates inside the water-cooled wall header 2, and a high-temperature environment of 500°C is located outside. At the same time, the header is suspended and supported by a spring hanger 7, and the header body 2 and the connecting suspension ear plate 3 are usually made of alloy steel. At present, expansion monitoring is limited to expansion monitoring of metal parts under normal temperature environments. For the environment in which the water-cooled wall header of a power station is located, expansion monitoring can only be implemented through indirect measurement methods using rigid parts. Therefore, based on the high-temperature environment inside the header and the external connection method, the present invention designs a method for arranging expansion measurement points to monitor the expansion state of the header.

[0064] like Figure 1-2 As shown, when the water-cooled wall header is vertical to the furnace wall of the boiler:

[0065] First, according to the welding regulations, select channel steel or angle steel of the same material as the header and the lug as the rigid lead-out channel steel, weld it to the position of the header hanging lug plate 3, and the other side needs to pass through the furnace wall 1 to lead outside the furnace, while maintaining free expansion, and indirectly reflect the expansion state of the header by monitoring the free expansion side. Usually, the length of the rigid lead-out channel steel 5 is generally 4-5 meters and easy to shake, so an inclined support is welded under the rigid lead-out channel steel, one side is connected to the header body, and the other side is supported on the rigid lead-out channel steel 5. This direction support is mainly used to strengthen the rigidity of the rigid lead-out channel steel in the vertical direction. At the same time, in order to strengthen the horizontal rigidity of the rigid lead-out channel steel, another rigid part is welded in the parallel direction of the rigid lead-out channel steel.

[0066] like Figure 3-4 As shown, when the water-cooled wall header is parallel to the furnace wall of the boiler:

[0067] First, according to the welding regulations, select channel steel or angle steel of the same material as the header and the lug as the rigid lead-out channel steel. In order to increase the welding contact area and enhance stability, first weld the reinforcing plate 9 at the position of the header suspension lug plate 3, and then weld the rigid lead-out channel steel 5 to the reinforcing plate 9. The other side needs to pass through the furnace wall 1 to lead outside the furnace, while maintaining free expansion, and indirectly reflect the expansion state of the header by monitoring the free expansion side. Usually, the length of the rigid lead-out channel steel 5 is generally 4-5 meters and easy to shake. The support reinforcement structure 4 is welded on both sides of the rigid lead-out channel steel 5 to form a plane triangle. Then weld the inclined support 4 under the rigid lead-out channel steel, one side is connected to the bottom of the header suspension lug plate 3, and the other side is supported on the rigid lead-out channel steel 5, which is used to strengthen the rigidity of the rigid lead-out channel steel in the vertical direction.

[0068] The technical solution provided by the present invention is further described in detail through the above specific implementation modes in order to highlight the advantages and benefits of the technical solution provided by the present invention. However, the above specific implementation modes are not intended to limit the present invention. Any reasonable modification and improvement of the present invention, combination of implementation modes and equivalent substitution within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for installing expansion measuring points of water-cooled wall of peak load-shaving boiler in power station, characterized in that: The installation method comprises: using a rigid lead-out channel steel (5) to lead the expansion test position of the water-cooled wall to the outside of the furnace wall (1), and fixing the measuring point (7) at the end of the rigid lead-out channel steel (5), wherein the head end of the rigid lead-out channel steel (5) is fixed to the expansion test position of the water-cooled wall.

2. The installation method according to claim 1, characterized in that: The furnace wall (1) is provided with a through hole, and the rigid lead-out channel steel (5) passes through the through hole to lead the measuring point position to the outside of the furnace wall (1), and the rigid lead-out channel steel (5) is matched with the gap of the through hole, and the gap is filled and sealed with a heat-insulating material.

3. The installation method according to claim 1, characterized in that: The ratio of the length of the rigid lead-out channel steel (5) extending outside the furnace wall (1) to its length inside the furnace wall (1) is between 1:5 and 1:

4.

4. The installation method according to claim 1, characterized in that: The water-cooled wall header is in a vertical relationship with the furnace wall of the boiler. The installation method also includes: fixing one end of the supporting reinforcement structure (4) on the water-cooled wall header (2) and fixing the other end to the rigid lead-out channel steel (5).

5. The installation method according to claim 1, characterized in that: The water-cooled wall header is parallel to the furnace wall of the boiler, and the installation method also includes: fixing a reinforcing plate (6) on the header suspension ear plate (3), one end of two supporting reinforcing structures (4) are respectively fixed to the two sides of the rigid lead-out channel steel (5), and the other end is respectively fixed to the reinforcing plate (6), one end of a supporting reinforcing structure (4) is fixed to the lower side of the rigid lead-out channel steel (5), and the other end is fixed to the water-cooled wall header (2).

6. The installation method according to claim 5, characterized in that: The two supporting reinforcement structures (4) are arranged in a mirror image with the rigid lead-out channel steel (5) as a reference, and the two supporting reinforcement structures (4) and the reinforcement plate (6) form an isosceles triangle, with the reinforcement plate (6) being the base.

7. The installation method according to claim 6, characterized in that: The supporting reinforcement structure (4) is a channel steel with the same material and shape as the rigid lead-out channel steel (5).

8. The installation method according to claim 1, characterized in that: The length of the rigid lead-out channel steel (5) is 4-5 meters.

9. The installation method according to claim 1, characterized in that: The measuring point (7) is fixed to the end of the rigid lead-out channel steel (5) by screw connection, and the head end of the rigid lead-out channel steel (5) is fixed to the water-cooled wall by rigid connection.

10. The installation method according to claim 4, characterized in that: The fixing method of the support reinforcement structure (4) and the water-cooled wall header (2), and the support reinforcement structure (4) and the rigid lead-out channel steel (5) is the same, which is welding or riveting.

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