Device for preventing low-pressure evaporator of waste heat boiler from being damaged due to fluid acceleration
By setting up fixed hanging ear plates in the steam and water separation area of the low-pressure evaporator of the waste heat boiler, welded into a container structure and fixedly connected to the furnace wall, the corrosion, damage and leakage problems caused by fluid acceleration are solved, and the anti-vibration, deformation and leakage capabilities are improved.
Patent Information
- Application Number
- CN202421610784.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-09
AI Technical Summary
The low-pressure evaporator of the waste heat boiler equipped with the 9F combined cycle unit is prone to corrosion, damage and leakage due to fluid acceleration, resulting in low damage resistance.
Fixed hanging ear plates are provided in the steam and water separation area of the low-pressure evaporator of the waste heat boiler, and the upper container, fin tube and riser tube are welded into a whole to form a container structure, and are fixedly connected to the furnace wall through the hanging ear plate, forming a double rigid bending, deformation and displacement structure.
By forming a dual rigid structure, the vibration resistance, deformation and leakage resistance of the low-pressure evaporator of the waste heat boiler is improved, and the explosion pipe leakage is prevented due to fluid acceleration.
Smart Images
Figure CN222951009U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a device for preventing a low-pressure evaporator of a waste heat boiler from being damaged due to fluid acceleration, which is suitable for solving the problem of corrosion, damage and explosion of pipes of a low-pressure evaporator of a waste heat boiler of a 9F combined cycle unit, and preventing the low-pressure evaporator of the waste heat boiler from being corroded (FAC), damaged or leaked due to fluid acceleration, and belongs to the technical field of power generation industry and ancillary equipment. Background Art
[0002] At present, most of the waste heat boilers equipped with 9F combined cycle units used in China are produced by domestic manufacturers after introducing foreign technology. According to traditional methods, the heated fin tube module of the waste heat boiler is a disposable structural component and is a maintenance-free structure. However, according to the actual operation of waste heat boilers in China, the heated fin tube connection of the low-pressure evaporator of the heated fin tube module is prone to corrosion, damage, and leakage, especially the heated fin tube connection of the low-pressure evaporator of the #5 heated fin tube module. Corrosion, damage, and leakage are prone to occur. According to the applicant's production practice experience summary, it is mainly caused by the following reasons: the upper header of the low-pressure evaporator and the riser and heated fin tubes next to it are a single independent structure, and no integral connection structure is formed. The relevant components are easily damaged and leaked under the impact of fluid acceleration, which causes the low-pressure evaporator to have low damage resistance.
[0003] After searching the Chinese patent database, no technical solutions related to preventing the low-pressure evaporator of the waste heat boiler from being damaged due to fluid acceleration were found to be disclosed in the Chinese patent announcement. Although there are some technical solutions for waste heat boiler leakage disclosed in the Chinese patent announcement, for example: Comparative document 1 is a utility model with application number 202311318608 4, which is a system and method for regulating the acid dew point of a waste heat boiler of a gas turbine with water recirculation, including a main control unit, the main control unit includes a sampling pipeline, the sampling pipeline is electrically connected to a monitoring unit, and the data receiving module is electrically connected to a calculation module, ... Comparative document 2 is a utility model with application number 201610648667 1, which is a method for judging the water leakage of a built-in waste heat boiler in a sintering machine flue, which mainly collects the temperature value data information of the upper and lower walls of the sintering machine flue after each group of heat exchangers in real time through a collection unit, ... Comparative document 3 is a utility model with application number 202221454134 7, which is a device for monitoring the leakage of an air separation cold box, ... Although these previously disclosed technical solutions provide methods for detecting leakage, they are not technical measures taken to address the corrosion and leakage of the waste heat boiler equipped with the 9F combined cycle unit, and cannot solve the corrosion and leakage problem of the waste heat boiler equipped with the 9F combined cycle unit. Utility Model Content
[0004] The purpose of the utility model is to solve the leakage problem of the waste heat boiler equipped with a 9F combined cycle unit, and to provide a device to prevent the low-pressure evaporator of the waste heat boiler from being damaged due to fluid acceleration. The utility model has outstanding substantial characteristics and significant technical progress, such as improving the vibration resistance, deformation resistance, and leakage resistance of the high and low pressure evaporators of the waste heat boiler equipped with the combined cycle unit, and preventing the low-pressure evaporator of the waste heat boiler from bursting and leaking due to damage caused by fluid acceleration.
[0005] The purpose of the utility model can be achieved by adopting the following technical solutions:
[0006] The device for preventing a low-pressure evaporator of a waste heat boiler from being damaged due to fluid acceleration comprises an upper header, finned tubes and riser tubes arranged in a steam-water separation zone of the low-pressure evaporator of the waste heat boiler, and its structural features are: a fixed lug plate is arranged in the steam-water separation zone of the low-pressure evaporator of the waste heat boiler, and the upper header, finned tubes and riser tubes are welded into a whole through the fixed lug plate to form a header structure to form a first rigid anti-bending, anti-deformation and anti-displacement structure; and the fixed lug plate is fixedly connected to the furnace wall of the waste heat boiler to form a second rigid anti-bending, anti-deformation and anti-displacement structure, that is, it has a double rigid anti-bending, anti-deformation and anti-displacement structure.
[0007] The purpose of the utility model can also be achieved by adopting the following technical solutions:
[0008] Furthermore, the same cross section perpendicular to the flue gas flow direction of several tube panels of the low-pressure evaporator is selected. There are generally three identical tube panels with the same cross section. The shape of each header structure should be similar to that of the original tube panel with the same cross section and have the same size.
[0009] Furthermore, the header structure is made of high-Cr alloy steel, and the corresponding pipe joints of the low-pressure evaporator are welded with dissimilar steels.
[0010] Furthermore, when used for technical transformation, in order to facilitate lifting and matching, the fin tube and the riser are left with an intermediate transition section of 550-650mm in length, which is used to adjust the welds on site before welding.
[0011] The utility model has the following outstanding substantive features and remarkable technical advances:
[0012] 1. The utility model relates to a device for preventing the low-pressure evaporator of a waste heat boiler from being damaged due to fluid acceleration. A fixed lug plate is set in the steam-water separation zone of the low-pressure evaporator of the waste heat boiler, and the upper header, fin tube and riser are welded into a whole through the fixed lug plate to form a header structure, so as to form a first rigid anti-bending, anti-deformation and anti-displacement structure; the fixed lug plate is fixedly connected to the furnace wall of the waste heat boiler to form a second rigid anti-bending, anti-deformation and anti-displacement structure, that is, it has a double rigid anti-bending, anti-deformation and anti-displacement structure. Therefore, it can solve the problem of leakage due to damage of the waste heat boiler equipped with a 9F combined cycle unit, and has outstanding substantial characteristics and significant technical progress such as improving the anti-vibration, anti-deformation and anti-leakage capabilities of the high and low pressure evaporators of the waste heat boiler equipped with the combined cycle unit, and preventing the low-pressure evaporator of the waste heat boiler from bursting and leaking due to damage caused by fluid acceleration.
[0013] 2. The utility model forms a double rigid anti-bending, anti-deformation and anti-displacement structure in the steam-water separation zone of the low-pressure evaporator of the waste heat boiler. On the one hand, the first rigid anti-bending, anti-deformation and anti-displacement structure can be used to increase the rigidity of the upper header, fin tube and riser in the steam-water separation zone of the low-pressure evaporator of the waste heat boiler, and effectively resist the impact of the components in this area due to fluid acceleration. On the other hand, the fixed connection between the header structure and the furnace wall structure can be used to prevent the displacement of the header structure and the resulting pipe burst leakage. Therefore, it can solve the leakage problem of the waste heat boiler equipped with the 9F combined cycle unit due to damage, and has substantial characteristics and technical progress such as improving the vibration resistance, deformation resistance and leakage resistance of the high and low pressure evaporators of the waste heat boiler equipped with the combined cycle unit, and preventing the low-pressure evaporator of the waste heat boiler from bursting and leaking due to damage caused by fluid acceleration. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a partial structural sectional view of a specific embodiment of the utility model.
[0015] Figure 2 It is a side view schematic diagram of a specific embodiment of the utility model in use state.
[0016] Figure 3 It is a partial front view schematic diagram of the use state of a specific embodiment of the utility model. DETAILED DESCRIPTION
[0017] The utility model is described in detail below with reference to the accompanying drawings:
[0018] Reference Figure 1-Figure 3The specific embodiment of the utility model relates to a device for preventing a low-pressure evaporator of a waste heat boiler from being damaged due to fluid acceleration, comprising an upper header 1, a fin tube 2 and a riser 3 arranged in a steam-water separation zone of the low-pressure evaporator of the waste heat boiler, and a fixed lug plate 4 is arranged in the steam-water separation zone of the low-pressure evaporator of the waste heat boiler. The upper header 1, the fin tube 2 and the riser 3 are welded into a whole through the fixed lug plate 4 to form a header structure to form a first rigid anti-bending, anti-deformation and anti-displacement structure; the fixed lug plate 4 is fixedly connected to the furnace wall of the waste heat boiler to form a second rigid anti-bending, anti-deformation and anti-displacement structure, that is, it has a double rigid anti-bending, anti-deformation and anti-displacement structure.
[0019] In this embodiment:
[0020] The same cross section perpendicular to the flue gas flow direction of several tube panels of the low-pressure evaporator is selected. There are generally three identical tube panels with the same cross section. The shape of each header structure is similar to that of the original tube panel with the same cross section and the size is consistent.
[0021] The header structure is made of high-Cr alloy steel, and the corresponding pipe joints with the low-pressure evaporator are welded with dissimilar steels.
[0022] When used for technical transformation, in order to facilitate lifting and matching, the fin tube 2 and the riser 3 leave an intermediate transition section of 550-650mm long, which is used to adjust the welds on site before welding.
[0023] In practical application, this embodiment:
[0024] First, a header structure is set in the steam-water separation area of the low-pressure evaporator of the heated fin tube module of the waste heat boiler, and the header structure is used to strengthen the overall rigidity of the heated fin tube module in the steam-water separation area to improve the vibration resistance, corrosion resistance and leakage resistance; the header structure is set to have a dual rigid anti-bending, anti-deformation and anti-displacement structure, including an upper header 1, fin tubes 2 and riser 3 set in the steam-water separation area of the low-pressure evaporator of the waste heat boiler, and the upper header 1, fin tubes 2, and riser 3 are welded into an integral structure by setting a fixed lug plate 4. The fixed lug plate 4 is fixedly connected to the furnace wall of the waste heat boiler to form a second rigid anti-bending, anti-deformation and anti-displacement structure, that is, it has a dual rigid anti-bending, anti-deformation and anti-displacement structure.
[0025] The steam-water separation area of the waste heat boiler low-pressure evaporator refers to the area where the riser 3 and the heated finned tube 2 are located near the upper header 1 of the low-pressure evaporator of the finned tube heating module #5 of the 9F combined cycle unit.
[0026] The fixed lug plate 4 has a plurality of bolt holes, and is fixed to the I-beam structure of the furnace wall by bolts when in use, and the fixing bolts are spot welded to form an integral connection structure.
[0027] When manufacturing new low-pressure evaporator products, the header structure is completed first, and then assembled together into an integral module, and the entire module passes water pressure tests and other inspections.
[0028] When used for technical transformation, the header structure pipe fittings should be processed and prefabricated in the factory in advance and then transported to the site. The header structure pipe fittings must meet the national boiler pipe fittings requirements; or before cutting and lifting the old header structure, the module should be reinforced as a whole, and the module offset should be monitored and controlled within a reasonable range.
[0029] After hoisting the header structure pipe fittings into the installation position, adjust and fix them. When installing the middle transition section (about 600 in length), the size needs to be cut according to the on-site installation conditions.
[0030] During on-site construction, care should be taken to prevent foreign matter from falling into the pipeline, and system cleaning and purging work should be strengthened during debugging.
[0031] When new products are installed or used for technical transformation, each on-site weld shall be subject to 100% radiographic inspection and pass a water pressure test of 1.5 times the working pressure; or when new products are installed or used for technical transformation, the construction unit shall have the qualification for boiler transformation, and shall be trained by the design unit or manufacturer and implemented under the on-site guidance of professional technicians.
[0032] Reference Figure 2 and Figure 3 In actual application, the header structure is installed in the upper area of the waste heat boiler low-pressure evaporator, where a low-pressure air bag 7 is easily formed. This area belongs to the steam-water separation area with a higher flow rate and has obvious fluid acceleration. In the lower area of the waste heat boiler low-pressure evaporator, no low-pressure air bag is formed at the connection between the lower header 5 and the furnace wall 6, which does not belong to the high-flow steam-water separation area and has no obvious fluid acceleration.
[0033] The header structure must be made of boiler pipes, which must be welded and heat treated, and pass the water pressure test, and the product must be manufactured and supervised in accordance with national boiler pipe fittings requirements.
[0034] The header structure is suitable for the technical transformation of the existing waste heat boiler low-pressure evaporator. It is designed and manufactured according to the known conditions of the relevant areas of the low-pressure evaporator that has been put into production, and the original area components are replaced.
[0035] The header structure can be directly applied and designed on a new waste heat boiler low-pressure evaporator.
[0036] Select the same cross-section of each tube screen of the low-pressure evaporator (perpendicular to the flue gas flow direction). Generally, there are three identical tube screens with the same cross-section. The shape of each header structure should be similar to that of the original tube screen with the same cross-section and have the same size.
[0037] The header structure is made of high-Cr alloy steel, and the corresponding pipe joints with the low-pressure evaporator are welded with dissimilar steels.
[0038] When used for technical transformation, in order to facilitate lifting and matching, the fin tube 2 and the riser 3 generally need to leave an intermediate transition section (about 600 meters long) to adjust the welds on site before welding.
[0039] 1) When manufacturing new low-pressure evaporator products, different manufacturing processes are designed according to two materials. The header structure is completed first, and then assembled together into an integral module. The entire module must pass water pressure tests and other inspections.
[0040] 2) When used for technical transformation, the header structure pipe fittings need to be processed and prefabricated in the factory in advance and then transported to the site. The header structure pipe fittings must comply with national boiler pipe fittings requirements.
[0041] 3) When used for technical transformation, the module should be reinforced as a whole before cutting and lifting out the old header structure, and the module offset should be monitored and controlled within a reasonable range.
[0042] 4) After hoisting the header structure pipe fittings into the installation position, adjust and fix them. When installing the intermediate transition section (about 600 in length), the size needs to be cut according to the on-site installation conditions.
[0043] 4) During on-site construction, care should be taken to prevent foreign matter from falling into the pipeline, and system cleaning and purging work should be strengthened during debugging.
[0044] 5) When new products are installed or used for technical transformation, each on-site weld shall be subject to 100% radiographic inspection and pass a water pressure test of 1.5 times the working pressure.
[0045] 6) When installing new products or using them for technical transformation, the construction unit must have the boiler transformation qualifications, be trained by the design unit or manufacturer, and implement the project under the on-site guidance of professional technicians.
[0046] 7) The local technical transformation of the header structure can save construction time and ensure quality. The construction period is about 60 days. The cost of the product or transformation is significantly lower than that of the overall design of the alloy steel low-pressure evaporator module.
[0047] Since the utility model forms a double rigid anti-bending, anti-deformation and anti-displacement structure in the steam-water separation zone of the low-pressure evaporator of the waste heat boiler equipped with the 9F combined cycle unit, on the one hand, the first rigid anti-bending, anti-deformation and anti-displacement structure can be used to increase the rigidity of the upper header, fin tube and riser in the steam-water separation zone of the low-pressure evaporator of the waste heat boiler, and effectively resist the impact of the components in this area due to fluid acceleration. On the other hand, the fixed connection between the header structure and the furnace wall structure can be used to prevent the displacement of the header structure and the resulting pipe burst leakage; therefore, the problem of leakage due to damage of the waste heat boiler equipped with the 9F combined cycle unit can be solved, and the utility model has substantial characteristics and technical progress such as improving the vibration resistance, deformation resistance and leakage resistance of the high and low pressure evaporators of the waste heat boiler equipped with the combined cycle unit, and preventing the low-pressure evaporator of the waste heat boiler from bursting and leaking due to damage caused by fluid acceleration.
Claims
1. A device for preventing a low-pressure evaporator of a waste heat boiler from being damaged due to fluid acceleration, comprising an upper header (1), a fin tube (2) and a riser (3) arranged in a steam-water separation zone of the low-pressure evaporator of the waste heat boiler, characterized in that: A fixed lug plate (4) is arranged in the steam-water separation zone of the low-pressure evaporator of the waste heat boiler, and the upper header (1), the finned tube (2) and the riser (3) are welded into a whole through the fixed lug plate (4) to form a header structure, thereby forming a first rigid anti-bending, anti-deformation and anti-displacement structure; and the fixed lug plate (4) is fixedly connected to the furnace wall of the waste heat boiler to form a second rigid anti-bending, anti-deformation and anti-displacement structure, that is, a dual rigid anti-bending, anti-deformation and anti-displacement structure is provided.
2. The device for preventing the low-pressure evaporator of a waste heat boiler from being damaged due to fluid acceleration according to claim 1, characterized in that: Select the same cross-section of several tube panels of the low-pressure evaporator that is perpendicular to the flue gas flow direction. Generally, there are three identical tube panels with the same cross-section. The shape of each header structure should be similar to that of the original tube panel with the same cross-section and have the same size.
3. The device for preventing the low-pressure evaporator of a waste heat boiler from being damaged due to fluid acceleration according to claim 1, characterized in that: The header structure is made of high-Cr alloy steel and is welded with dissimilar steel to the corresponding pipe joints of the low-pressure evaporator.
4. The device for preventing a waste heat boiler low-pressure evaporator from being damaged due to fluid acceleration according to claim 1, characterized in that: A middle transition section is reserved between the fin tube (2) and the riser tube (3) for adjusting each weld joint on site before welding.