A wedge-shaped grid type marine fouling intercepting screen for a water inlet of a thermal power plant

Abstract

The present application belongs to the technical field of heat plant seawater intake mouth pollution interception, and particularly relates to a heat plant intake mouth wedge-shaped grid type marine pollution interception fence. The present application comprises a rectangular frame, a wedge-shaped grid array and a fixed connecting piece. The frame is welded by a cross beam and a vertical beam, and is provided with a reinforcing beam, and is installed in the intake mouth at an inclination angle of 80-90 degrees. The grid array is composed of a plurality of parallel and equidistant wedge-shaped grids, and the adjacent spacing is 50-70 mm. Each grid section is symmetrically wedge-shaped, with a length of 80-120 mm, a thickness of 10 mm and a half taper angle of 15 degrees. The flow-approaching end is a sharp corner guide, and the backflow end is a flat section. The fixed connecting piece detachably fixes the grid on the frame through a clamping groove and a bolt. The surface of the grid is coated with an antifouling and anticorrosion coating. The present application reduces the water head loss through the sharp corner guide, and the flat end is convenient for fixing, dismounting and replacing. The reasonable grid spacing effectively intercepts marine pollution, prevents blockage, is corrosion-resistant as a whole, is convenient to maintain, the number of grids is adjustable, and is suitable for different scale heat plants.

Description

Technical Field

[0001] This invention belongs to the field of marine fouling interception technology for water flow at the inlet of thermal power plants, specifically relating to a wedge-shaped grid-type marine fouling interception barrier at the inlet of a thermal power plant. Background Technology

[0002] Cogeneration power plant circulating water systems often use seawater as a cooling water source. Trash screens must be installed at the water intake to intercept pollutants in the water, ensuring the stable operation of core equipment such as circulating water pumps, heat exchange tubes, and condensers. Seawater is rich in large marine fouling organisms such as barnacles, mussels, and algae, as well as microbial contaminants such as planktonic microorganisms and bacteria. These contaminants have strong adhesion and rapid reproduction rates, posing a major hazard to the water intake systems of cogeneration power plants.

[0003] Currently, conventional wastewater intake screens in thermal power plants generally use rectangular cross-section bars with equal-thickness straight-edge structures. The overall design is a sloping frame, which has the following serious technical defects: 1. Severe marine fouling and frequent blockage: The rectangular grid bars have right angles on their flow-facing surfaces, causing violent flow separation when water flows through them. This creates a large area of ​​low-velocity stagnant water at the tail of the bars, providing a stable environment for barnacles and mussels to attach. Planktonic microorganisms easily proliferate on the surface of the bars, forming biofilms that further exacerbate fouling. Long-term accumulation leads to grid blockage and reduction of flow area. In severe cases, it can cause overload of circulating water pumps and blockage of condenser heat exchange tubes, forcing power plants to shut down for maintenance and affecting the continuity of power generation. 2. Weak antifouling ability and aggravated equipment corrosion: Barnacles and mussels secrete acidic substances after attaching, which corrode the rectangular bars and frame; microbial biofilms accelerate the electrochemical corrosion of metals. Conventional trash racks used in seawater environments for a long time are prone to rust and deformation, which greatly shortens their service life and increases maintenance costs. 3. High water flow resistance and reduced heat exchange efficiency: The sharp corners of the rectangular grid cause severe water flow disturbance, resulting in high local resistance coefficient, large head loss, and increased energy consumption for circulating water transport. At the same time, fouling and biological adhesion further increase water flow resistance and reduce circulating water flow, leading to a decrease in condenser heat exchange efficiency and an increase in power generation energy consumption of the thermal power plant. 4. Difficult to clean and high maintenance costs: Barnacles and mussels have extremely strong adhesion, and conventional mechanical cleaning is difficult to completely remove them, leaving residues on the roots; microbial biofilms require frequent chemical cleaning, which not only increases maintenance costs but also causes secondary pollution of seawater, failing to meet environmental protection requirements.

[0004] Existing trash rack technologies mostly focus on optimizing mechanical cleaning structures or modifying surface antifouling coatings. Mechanical cleaning equipment is complex and easily trapped by fouling organisms, while antifouling coatings have poor durability and are prone to peeling off. Neither of these approaches can fundamentally solve the problem of marine fouling organism attachment at the structural level. For the seawater intake scenario of thermal power plants, there is an urgent need for a trash rack that is adapted to the marine environment, can efficiently intercept barnacles, mussels, and microorganisms, and has strong self-cleaning capabilities. Summary of the Invention

[0005] To address the problems of severe marine fouling biofouling, frequent clogging, weak corrosion resistance, and high operation and maintenance costs of conventional rectangular bar trash racks in thermal power plants, this invention proposes a wedge-shaped bar trash rack for marine fouling interception at the inlet of a thermal power plant, comprising a trash rack frame, a wedge-shaped bar array, and fixing connectors. The trash rack frame is a rectangular frame structure, which is welded together by top crossbeams, bottom crossbeams and side vertical beams. The whole structure is installed at an angle of 80°-90° in the channel or forebay of the seawater circulating water intake of the thermal power plant. The wedge-shaped grid array is composed of several wedge-shaped grids of the same specification that are parallel to each other and arranged at equal intervals, with the spacing between adjacent wedge-shaped grids being 50mm-70mm. The wedge-shaped grid bar is long and narrow with a symmetrical wedge-shaped cross-section. Its length L is 80mm-120mm and its maximum thickness t=10mm. The wedge-shaped grid bar has a pointed flow guiding structure at the flow-facing end and a flat cross-section at the flow-reverse end. Both of these are arranged along the inclined direction of the trash rack frame. The fixing connector is used to detachably fix the wedge-shaped grid array to the trash rack frame.

[0006] According to the above-described wedge-shaped marine fouling interception barrier at the inlet of a thermal power plant, the wedge-shaped bars are made of 316L stainless steel and the surface is mirror-polished and then coated with a marine-specific non-toxic antifouling and anti-corrosion coating.

[0007] According to the above-described wedge-shaped marine fouling barrier for a thermal power plant inlet, the outer wall of the barrier frame is surrounded by annular reinforcing ribs; and several transverse reinforcing beams are arranged at equal intervals parallel to the top beam and bottom beam on the barrier frame.

[0008] According to the above-described wedge-shaped marine fouling barrier at the inlet of a thermal power plant, the fixing connector includes a positioning slot and a fastening bolt. The positioning slot is respectively opened on the inner side wall of the top beam, bottom beam and transverse reinforcing beam of the barrier frame, and is adapted to engage with the straight end of the wedge-shaped barrier bar against the current. The fastening bolt passes through the positioning slot and the threaded hole at the end of the straight end against the current to lock and fix it.

[0009] According to the above-described wedge-shaped marine fouling barrier at the inlet of a thermal power plant, the barrier frame is made of carbon steel and welded together. After welding, it undergoes hot-dip galvanizing for corrosion protection, resulting in a uniform and dense galvanized layer.

[0010] According to the above-described wedge-shaped grid marine fouling interceptor grid for the inlet of a thermal power plant, the direction of the wedge-shaped grid bar facing the flow is consistent with the direction of the incoming seawater flow, and the sharp-angled flow guiding structure at the facing end can smoothly divert the incoming flow.

[0011] According to the above-described wedge-shaped grid marine fouling interception barrier for a thermal power plant inlet, the number of wedge-shaped grid bars can be adjusted according to the actual width of the thermal power plant intake, and after adjustment, a uniform spacing of 60mm is maintained to adapt to the seawater intake needs of thermal power plants of different sizes.

[0012] According to the above-described wedge-shaped marine fouling barrier at the inlet of a thermal power plant, there are 2-3 annular reinforcing ribs, which are fixedly installed at equal intervals on the outer wall of the barrier frame.

[0013] According to the above-described wedge-shaped marine fouling interceptor grid for a thermal power plant inlet, the wedge-shaped grid bar has a symmetrical wedge-shaped cross-section with a length L=100mm along the water flow direction, a maximum thickness t=10mm, and a half-cone angle of 15°, where the half-cone angle is half of the apex angle.

[0014] According to the above-described wedge-shaped marine fouling barrier at the inlet of a thermal power plant, the barrier frame is installed at an 85° angle in the channel or forebay of the seawater circulating water intake of the thermal power plant.

[0015] The beneficial effects of this invention are as follows: 1. Highly efficient interception of marine fouling and prevention of equipment blockage. The wedge-shaped grid of this invention has a spacing of 60mm, which can accurately intercept large marine fouling organisms such as barnacles and mussels; the wedge-shaped cross-section structure reduces low-velocity dead water zones, inhibits the attachment and growth of planktonic microorganisms, avoids biofilm formation, reduces the probability of grid blockage from the source, ensures the normal operation of equipment such as circulating water pumps and condensers, and reduces the number of power plant shutdowns for maintenance; 2. Strong self-cleaning ability, reducing operation and maintenance costs. The wedge-shaped grid bar of this invention smoothly diverts seawater, with a small tail recirculation zone and weak eddy intensity. The average shear stress on the wall reaches 2.12 Pa, which is higher than the critical peeling stress for barnacles and mussels. It can automatically peel off the attached fouling organisms through the seawater flow, eliminating the need for frequent mechanical or chemical cleaning, reducing operation and maintenance costs, and avoiding secondary pollution of seawater; the self-cleaning efficiency reaches 78.6%. 3. Corrosion and adhesion resistant, extending service life. The wedge-shaped bars of this invention are made of 316L stainless steel with a marine antifouling coating and polished surface. They are resistant to seawater acid and alkali corrosion and inhibit the adhesion of microorganisms, barnacles and mussels. The service life is increased by more than 40% compared with conventional rectangular bar trash racks, reducing the frequency of equipment replacement. 4. Low water flow resistance and improved heat exchange efficiency. The wedge-shaped grid bars of this invention reduce water flow resistance by 24.1% compared with conventional rectangular grid bars, significantly reducing head loss and reducing energy consumption for circulating water transportation. At the same time, the absence of increased resistance due to fouling and biological adhesion ensures stable circulating water flow, improves condenser heat exchange efficiency, and reduces power generation energy consumption in thermal power plants. 5. Simple structure and strong adaptability. The modular and detachable design of this invention allows for individual disassembly and replacement of the wedge-shaped grid bars, making maintenance convenient. The number of grid bars and the frame inclination angle can be adjusted according to the specifications of the thermal power plant's water intake and the seawater flow velocity, adapting to seawater intake scenarios of thermal power plants of different sizes, and can operate stably within a flow velocity range of 0.3~1.5m / s. Attached Figure Description

[0016] Figure 1 This is a perspective view of a wedge-shaped grid-type marine fouling interceptor grid for a thermal power plant inlet, according to the present invention. Figure 2 This is a perspective view of a conventional rectangular bar trash rack in the prior art. Figure 3 This is a perspective view of the structure of the wedge-shaped grid bar of a wedge-shaped grid type marine fouling interception barrier for a thermal power plant inlet according to the present invention; Figure 4 This is a velocity field cloud map of the wedge-shaped grid bars of a marine fouling interception grid for a thermal power plant inlet, according to the present invention. Figure 5 This is a pressure cloud diagram of the wedge-shaped grid bars of a marine fouling interception grid for a thermal power plant inlet, according to the present invention. Figure 6 This is a diagram showing the streamline distribution of the wedge-shaped grid bars in a wedge-shaped grid type marine fouling interception grid for a thermal power plant inlet according to the present invention. Figure 7 This is a diagram showing the shear stress distribution of the wedge-shaped grid bars in a marine fouling interception grid for a thermal power plant inlet, according to the present invention. Figure 8 The velocity field contour map of the rectangular bars of a conventional rectangular bar trash rack in the prior art; Figure 9 Pressure contour map of the rectangular bars of a conventional rectangular bar trash rack in the prior art; Figure 10 This is a flow line distribution diagram of the rectangular bars in a conventional rectangular bar trash rack of existing technology. Figure 11 This is a diagram showing the shear stress distribution of the rectangular bars in a conventional rectangular bar trash rack of the prior art.

[0017] In the diagram: 1-Scrap rack frame, 2-Transverse reinforcing rib, 3-Top beam, 4-Wedge-shaped grid bar, 5-Conventional rectangular grid bar, 6-Side vertical beam, 7-Bottom beam, 8-Wedge-shaped grid bar facing the flow, 9-Wedge-shaped grid bar facing the flow, 10-Top corner; 40-Wedge-shaped grid bar array. Detailed Implementation

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the specific parameters, materials, and processes in this embodiment are merely illustrative descriptions to clearly illustrate the core concept of the present invention and do not constitute a limitation on the scope of protection of the present invention. Equivalent substitutions, parameter adjustments, and local structural modifications made by those skilled in the art based on conventional knowledge without departing from the essence of the present invention all fall within the scope of protection of the present invention.

[0019] This embodiment uses the seawater circulation water intake scenario of a thermal power plant as an example to illustrate the structure, installation, and working process of a wedge-shaped marine fouling interceptor grid at the inlet of a thermal power plant.

[0020] Structural composition description This embodiment of a wedge-shaped marine fouling barrier for a thermal power plant inlet includes a barrier frame 1 and a wedge-shaped bar array 40, which can be directly installed in the channel or forebay of the seawater intake of a thermal power plant.

[0021] The trash rack frame 1 is a rectangular frame structure, which is welded together by a top crossbeam 3, a bottom crossbeam 7, and two side vertical beams 6, forming an overall rectangular frame. Multiple transverse reinforcing ribs 2 are set inside the frame, arranged parallel to the top crossbeam 3 and the bottom crossbeam 7, dividing the interior of the trash rack frame 1 into multiple support areas to enhance the overall rigidity of the frame and resist the additional stress caused by the impact of seawater flow and the attachment of fouling organisms.

[0022] In this embodiment, the trash rack frame 1 is made of carbon steel and then hot-dip galvanized. Its size is adapted to the width of the water intake, with a width of 5.0m and a height of 14.0m. The size can be adjusted according to the specifications of the water intake of different thermal power plants.

[0023] The wedge-shaped grid array 40 is composed of multiple wedge-shaped grid bars 4 arranged in parallel and at equal intervals. All the wedge-shaped grid bars 4 are fixed to the top crossbeam 3, the bottom crossbeam 7 and the transverse reinforcing ribs 2 of the trash rack frame 1, forming a stable trash rack structure.

[0024] like Figure 1As shown, each wedge-shaped bar 4 is a long strip structure. The upstream end of the wedge-shaped bar 4 is the upstream pointed end 8, and the downstream end is the downstream straight end 9. The cross-section of the bar is symmetrical wedge-shaped, as shown in the figure. Figure 3 As shown, the length along the water flow direction is L, the maximum thickness is t, and the semi-cone angle is α, which is half of the apex angle. In this embodiment: L=100mm, t=10mm, and the semi-cone angle α=15°; the spacing between the bars is 60mm, which can effectively intercept large marine fouling organisms such as barnacles and mussels, while ensuring the flow capacity of seawater.

[0025] The wedge-shaped grid 4 is made of 316L stainless steel. After being mirror polished, the surface is coated with a marine-specific antifouling and anti-corrosion coating, which can inhibit the adhesion of microorganisms, resist seawater corrosion and the erosion of fouling organism secretions, and extend its service life.

[0026] Compared with the structure of conventional trash racks like Figure 2 As shown, existing conventional trash racks use conventional rectangular bars 5. The cross-section of the conventional rectangular bars 5 is a rectangle of uniform thickness, and both the upstream and downstream ends are right-angled structures, which is significantly different from the wedge-shaped bars 4 of this invention. The right angle of the conventional rectangular grid bar 5 facing the flow will cause the water flow to stagnate violently, forming a large area of ​​low-speed dead water, which provides a stable environment for barnacles and mussels to attach. The wedge-shaped grid bar 4 of the present invention has a sharp angle at the flow-facing end, which can smoothly divert the water flow and avoid flow separation, greatly reducing the formation of low-speed dead water zones and structurally inhibiting the attachment of fouling organisms.

[0027] Installation and Implementation Steps The installation process of the trash rack in this embodiment is as follows: Frame positioning: Hoist the trash rack frame 1 into the channel of the seawater intake of the thermal power plant and adjust the installation angle. In this embodiment, an 85° inclined installation is adopted so that the frontal sharp corner 8 of the rack bar faces the direction of the water flow and forms an 85° angle with the direction of the water flow to reduce the impact of the water flow. Installation of the grid bars: Insert the wedge-shaped grid bars 4 into the reserved slots on the top crossbeam 3, bottom crossbeam 7 and transverse reinforcing rib 2 of the trash rack frame 1 in sequence, adjust the grid bar spacing to 60mm, and fix the wedge-shaped grid bars 4 by bolts or welding to ensure that the wedge-shaped grid bars 4 are parallel to each other and without offset. Corrosion and fouling prevention treatment: Apply anti-corrosion coating to easily corroded areas such as welded parts and slots, and inspect the fouling coating on the surface of wedge-shaped grid 4 to ensure that there is no missed coating or peeling. Overall commissioning: Water flow test to check the stability and flow capacity of the trash rack, confirm that the wedge-shaped bars 4 do not wobble or deform, and the installation is complete.

[0028] III. Work Process and Effect Verification like Figures 4 to 11 As shown, to verify the technical advantages of this invention over conventional rectangular trash racks, flow field simulations were conducted based on a typical seawater intake velocity of 0.8 m / s at a thermal power plant. The velocity contour maps, pressure contour maps, streamline distribution maps, and shear stress distribution maps of the two inventions were compared and analyzed. The results are as follows: Comparison of velocity field contour maps: such as Figure 8 As shown: The flow-facing end of the conventional rectangular screen bar 5 is a right-angled structure. After the water flow impacts it, it becomes severely stagnant, forming a large area of ​​low-velocity dead water at the tail of the screen bar. The stagnant water flow in this area provides a stable attachment and reproduction environment for barnacles, mussels, and planktonic microorganisms, which is the core cause of blockage of the rectangular trash rack. Figure 4 As shown: The wedge-shaped grid bar 4 of the present invention adopts a sharp-angle guiding structure, and seawater can be smoothly diverted along the wedge-shaped inclined surface, resulting in a gentle flow transition. According to simulation measurements, the low-speed backflow zone at the tail of the wedge-shaped grid bar is 80mm, while the low-speed backflow zone at the tail of the conventional rectangular grid bar 5 is 150mm. The low-speed zone is prone to debris retention and attachment. The low-speed backflow zone at the tail of the wedge-shaped grid bar is significantly reduced compared to the conventional rectangular grid bar 5, which greatly reduces the attachment area of ​​fouling organisms and effectively inhibits the occurrence of clogging problems.

[0029] Comparison of pressure cloud maps: such as Figure 9 As shown: A conventional rectangular grid with five right-angled front faces forms a concentrated high-pressure zone, while the back face forms a large low-pressure zone. The large pressure difference across the grid and high local head loss not only increase the energy consumption of circulating water transport, but the pressure difference also further compacts attached debris, exacerbating blockage. For example... Figure 5 As shown: The pressure distribution of the wedge-shaped grid bars 4 in this invention is generally smooth, with no localized areas of high or low pressure concentration; the advantages of the wedge-shaped trash rack can be more intuitively demonstrated through the comparison of the resistance coefficient. The resistance coefficient directly reflects the degree to which the grid obstructs water flow, and is calculated by dividing the pressure difference across the grid by the dynamic pressure.

[0030] In the formula, The pressure difference (Pa) is the pressure difference across the grid. Let be the density of water (998.2 kg / m³), and v be the incoming flow velocity (m / s). A smaller drag coefficient results in lower head loss, which is more beneficial to the energy efficiency of the water intake project. Based on simulation calculations, the overall drag coefficient of the wedge-shaped grid is... The drag coefficient of a conventional rectangular grid bar 5 is 0.85. The value was 1.091, a decrease of 24.1%, which significantly reduced head loss, reduced the operating load of the circulating water pumps in the thermal power plant, and consequently reduced power generation energy consumption.

[0031] Comparison of streamline distribution diagrams: such as Figure 10As shown: the five-sided corners of a conventional rectangular grid induce strong flow separation, resulting in large-scale turbulent eddies at the tail of the grid. The streamlines are severely distorted, and seaweed and suspended debris in the water are easily entangled and trapped by these eddies, leading to a reduction in the grid's flow area over time. For example... Figure 6 As shown: The streamlines of the wedge-shaped grid bar 4 of the present invention extend smoothly along the grid bar wall, with weak boundary layer separation, small tail vortex size and low intensity; the main water flow has good continuity, and the intercepted small debris can flow downstream quickly with the main flow, avoiding vortex entanglement and accumulation, and further improving the anti-clogging ability.

[0032] Comparison of shear stress distribution diagrams: Wall shear stress is the core driving force for water flow to achieve self-cleaning; critical shear stress... A threshold of 1.5 Pa is taken as the typical stripping threshold for aquatic debris, referring to GB / T 20801-2006. For example... Figure 11 As shown: The shear stress distribution of the conventional rectangular grid bar 5 is extremely uneven: the stress is high only at the right angle facing the flow, and the shear stress in the tail area of ​​the grid bar is less than 0.5 Pa, far from meeting the requirements for removing fouling substances. The tail becomes a permanent fouling area, which must be cleaned manually or mechanically. Figure 7 As shown: The wedge-shaped grid bar 4 of this invention has a uniform wall shear stress distribution, a wide effective range throughout its entire length, and an average wall shear stress of 2.12 Pa, which is higher than the critical peel stress of 1.5 Pa. By assessing the cleaning efficiency, a more suitable cleaning grid can be selected more precisely. The self-cleaning efficiency is defined as the ratio of the grid bar surface area where the wall shear stress is greater than the critical shear stress to the total grid bar surface area.

[0033] In the formula, the critical shear stress A pressure of 1.5 Pa was used. Simulation results showed that the self-cleaning efficiency of the wedge-shaped grid reached 78.6%. The water flow can automatically flush away and peel off attached barnacles, mussels, and microorganisms using its own shear force, achieving self-cleaning.

[0034] Based on the comparison of the flow field cloud maps and quantitative data, it can be seen that this invention, through the cross-sectional structure of the wedge-shaped bars 4, solves the defects of traditional rectangular trash racks, such as large low-speed dead water zones, turbulent eddies, insufficient shear stress, and high water flow resistance. It can efficiently intercept marine fouling such as barnacles, mussels, and planktonic microorganisms, while relying on the self-cleaning ability of the water flow to reduce clogging and cleaning operations. It is suitable for seawater intake scenarios in thermal power plants, ensuring the long-term stable operation of core equipment such as circulating water pumps, condensers, and heat exchange tubes. When seawater carrying barnacles, mussels, planktonic microorganisms, and floating debris passes through the trash rack, large marine fouling is precisely intercepted by the 60mm spacing wedge-shaped bar array; the water flows smoothly along the wedge-shaped bars, relying on uniform wall shear stress to complete self-cleaning. The entire system has a simple structure, is easy to disassemble and maintain, and is suitable for the water intake needs of thermal power plants of different sizes.

[0035] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A wedge-shaped barrier for intercepting marine fouling at the inlet of a thermal power plant, characterized in that, Includes a trash rack frame (1), a wedge-shaped grid array (40), and fixing connectors; The trash rack frame (1) is a rectangular frame structure, which is welded together by a top crossbeam (3), a bottom crossbeam (7) and a side vertical beam (6). The whole structure is installed at an angle of 80°-90° in the channel or forebay of the seawater circulating water intake of the thermal power plant. The wedge-shaped grid array (40) is composed of several wedge-shaped grids (4) of the same specification and parallel to each other, arranged at equal intervals, with the spacing between adjacent wedge-shaped grids (4) being 50mm-70mm; The wedge-shaped grid bar (4) is long and has a symmetrical wedge-shaped cross section. Its length L is 80mm-120mm, its maximum thickness t=10mm, and its half cone angle is 15°, which is half of the apex angle (10). The wedge-shaped grid bar (4) has a sharp-angled flow guiding structure at the flow-facing end (8) and a straight wedge-shaped grid bar (4) with a flat cross section at the flow-reverse end (9). Both are arranged along the inclined direction of the trash rack frame. The fixing connector is used to detachably fix the wedge-shaped grid array (40) to the trash rack frame (1).

2. The wedge-shaped barrier for marine fouling interception at the inlet of a thermal power plant according to claim 1, characterized in that, The wedge-shaped grid (4) is made of 316L stainless steel and its surface is mirror polished and then coated with a marine-specific non-toxic antifouling and anti-corrosion coating.

3. The wedge-shaped barrier for marine fouling interception at the inlet of a thermal power plant according to claim 1, characterized in that, The outer wall of the trash rack frame (1) is surrounded by annular reinforcing ribs; on the trash rack frame (1), several transverse reinforcing beams (2) are arranged at equal intervals parallel to the top beam (3) and the bottom beam (7).

4. The wedge-shaped barrier for marine fouling interception at the inlet of a thermal power plant according to claim 1, characterized in that, The fixed connector includes a positioning slot and a fastening bolt. The positioning slot is respectively opened on the inner side wall of the top crossbeam (3), bottom crossbeam (7) and transverse reinforcing beam (2) of the trash rack frame, and is adapted to be engaged with the backflow straight end (9) of the wedge-shaped grid bar. The fastening bolt passes through the end threaded hole of the positioning slot and the backflow straight end (9) to lock and fix it.

5. A wedge-shaped barrier for intercepting marine fouling at the inlet of a thermal power plant according to claim 1, characterized in that, The trash rack frame (1) is made of carbon steel and welded together. After welding, it is hot-dip galvanized for corrosion protection, and the galvanized layer is uniform and dense.

6. A wedge-shaped barrier for intercepting marine fouling at the inlet of a thermal power plant according to claim 1, characterized in that, The wedge-shaped grid bar facing end (8) is aligned with the direction of the incoming seawater flow, and the sharp-angled flow guiding structure of the facing end (8) can smoothly divert the incoming flow.

7. A wedge-shaped barrier for intercepting marine fouling at the inlet of a thermal power plant according to claim 1, characterized in that, The number of wedge-shaped grid array (40) can be adjusted according to the actual width of the water intake of the thermal power plant. After adjustment, a uniform spacing of 60mm is maintained to meet the seawater intake needs of thermal power plants of different sizes.

8. A wedge-shaped barrier for intercepting marine fouling at the inlet of a thermal power plant according to claim 1, characterized in that, There are 2-3 annular reinforcing ribs, which are fixedly installed at equal intervals on the outer wall of the trash rack frame (1).

9. A wedge-shaped barrier for intercepting marine fouling at the inlet of a thermal power plant according to claim 1, characterized in that, The wedge-shaped bar (4) has a symmetrical wedge-shaped cross section with a length L=100mm along the water flow direction, a maximum thickness t=10mm, and a semi-cone angle of 15°.

10. A wedge-shaped barrier for intercepting marine fouling at the inlet of a thermal power plant according to claim 1, characterized in that, The trash rack frame (1) is installed at an 85° angle in the channel or forebay of the seawater circulation intake of the thermal power plant.

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