A filtering device for a circulating water system and a circulating water system

Abstract

The present invention provides a filtering device for a circulating water system and a circulating water system, specifically relating to the technical field of power plant supporting equipment. The filtering device includes a frame, an operation platform, a first filtering structure and a second filtering structure. The operation platform is installed on the filtering frame. The first filtering structure is fixedly installed on the lower layer of the frame. The second filtering structure includes a first layer of filter mesh and a second layer of filter mesh. The first layer of filter mesh and the second layer of filter mesh are detachably installed on the upper layer of the frame. The filtering device of the present invention can not only enhance the reliability of use, but also be disassembled and cleaned without shutting down the machine, enhancing the cooling effect of the heat exchange equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary equipment for power plants, and particularly relates to a filtering device for a circulating water system and a circulating water system. Background Art

[0002] At present, a filter screen needs to be installed in front of the inlet of the circulating water pump in the circulating water system of a power plant to prevent foreign objects from entering and damaging the pump body and affecting the heat exchange effect of the heat exchange equipment of the steam turbine generator set. However, for most of the existing filter screens installed in the circulating water systems of small power plants, they are directly fixedly installed at the suction port of the circulating water pump. Although their structures are simple, due to long-term underwater corrosion and the strong impact on the filter screen caused by the backflow of cooling water in the circulating water pipeline after the pump stops, the filter screen is very likely to be deformed and fall off, directly resulting in a low service life of the filter screen, and even being sucked into the pump and damaging the circulating water pump after falling off.

[0003] At present, the materials of the filter screen and the support used on the circulating water pump are mostly ordinary stainless steel or carbon steel, and their wear resistance and corrosion resistance are poor when facing the mixing of pickling solution into the backflow circulating water, resulting in a low service life of the filtering device. And for the current production mode of power plants, there are no conditions to completely shut down and replace the filter screen. In the long run, the blockage of the filter screen will seriously affect the heat exchange effects of condensers, air coolers and oil coolers, thereby reducing the power generation efficiency.

[0004] Based on this, it is urgent to develop a filtering device for a circulating water system and a circulating water system to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, the present invention provides a filtering device for a circulating water system and a circulating water system. The filtering device can not only enhance the use reliability, but also be disassembled and cleaned without shutting down the machine, enhancing the cooling effect of the heat exchange equipment.

[0006] To achieve the above object and other related objects, the present invention provides a filtering device for a circulating water system. The filtering device includes a frame, an operation platform, a first filtering structure and a second filtering structure. The operation platform is installed on the filtering frame. The first filtering structure is fixedly installed on the lower layer of the frame. The second filtering structure includes a first layer of filter screen and a second layer of filter screen, and the first layer of filter screen and the second layer of filter screen are detachably installed on the upper layer of the frame.

[0007] In an example of the present invention, the frame includes a plurality of columns. The plurality of columns are arranged in a staggered manner to form a square frame. The square frame is provided with a fixing surface and an installation surface. The fixing surface faces the circulating water pool wall and is closely attached thereto. The first filtering structure and the second filtering structure are installed on the installation surface.

[0008] In an example of the present invention, the first - layer filter screen includes a filter - screen frame, a filter net, and a pressing frame. The filter - screen frame is provided with a net pocket for supporting the filter net. The filter net is installed on the filter - screen frame and is fixedly pressed by the pressing frame. The structure of the second - layer filter screen is the same as that of the first - layer filter screen.

[0009] In an example of the present invention, the filtering device further includes a lifting device. The lifting device includes a hoisting mechanism and a first guide rail. The first guide rail is installed on the pillar of the frame. The first - layer filter screen and the second - layer filter screen are slidably installed on the first guide rail. The hoisting mechanism is installed on the top of the frame and drives the first - layer filter screen and the second - layer filter screen to slide along the first guide rail.

[0010] In an example of the present invention, several supports are provided between adjacent first guide rails. The several supports include transverse supports and / or longitudinal supports.

[0011] In an example of the present invention, the hoisting mechanism includes an electric hoist and a second guide rail. The second guide rail is installed on the top of the frame. The electric hoist is installed on the second guide rail and slides along the second guide rail.

[0012] In an example of the present invention, suspension parts that cooperate with the hooks of the electric hoist are provided at the tops of the first - layer filter screen and the second - layer filter screen.

[0013] In an example of the present invention, the filtering device further includes a ceiling, and the ceiling is fixedly installed on the top of the frame.

[0014] In an example of the present invention, a safety guardrail is provided around the operation platform.

[0015] In an example of the present invention, an anti - corrosion layer is provided on the upper - layer structure of the filtering device.

[0016] On the other hand, the present invention provides a circulating water system. The circulating water system includes the above - mentioned filtering device, and the filtering device is fixedly installed in a circulating water tank.

[0017] The filtering device of the present invention is provided with a fixed - type filtering structure at the lower layer and a movable - type filtering structure at the upper layer. When the sundries in the circulating water increase, the movable - type filtering structure can be disassembled and cleaned. Moreover, the movable - type filtering structure is set as a double - layer filter - screen structure and can be disassembled and cleaned layer by layer without affecting the normal use of the equipment, effectively solving the problems of poor wear resistance, poor corrosion resistance, low service life, and difficulty in replacement in the prior art, making the filtering device more reliable in use and longer in service life, ensuring the heat - exchange effect of the power - generating equipment, and generating electricity efficiently. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 Structural schematic diagram of the filtering device of the present invention in an embodiment;

[0020] Figure 2 Structural schematic diagram of the first filter screen / second filter screen of the filtering device of the present invention in an embodiment;

[0021] Figure 3 Structural schematic diagram of the lifting mechanism of the filtering device of the present invention in an embodiment.

[0022] Element number description

[0023] 100, frame; 101, pillar; 102, operation platform; 103, safety guardrail; 110, first filtering structure; 120, second filtering structure; 121, first filter screen; 122, second filter screen; 1211, filter screen frame; 1212, filter screen; 1213, pressing frame; 1214, mesh bag; 1215, suspension part; 130, lifting device; 131, lifting mechanism; 1311, second guide rail; 1312, traveling trolley; 1313, drum; 1314, driving motor; 1315, movable pulley; 1316, hook; 1317, cable; 1318, cable head fixing part; 1319, fixed pulley assembly; 132, first guide rail; 140, ceiling. Specific embodiments

[0024] The following uses specific examples to illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. It should also be understood that the terms used in the embodiments of the present invention are for the purpose of describing specific implementation schemes, rather than limiting the protection scope of the present invention. The test methods without specific conditions noted in the following embodiments are usually carried out under conventional conditions or according to the conditions recommended by each manufacturer.

[0025] It should be noted that terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships, without substantial changes in the technical content, should also be regarded as the scope of implementation of the present invention.

[0026] Please refer to Figures 1 to 3 , the present invention provides a filtering device and a circulating water system for a circulating water system. By setting a movable filtering structure, when the debris in the circulating water increases, the movable filtering structure can be disassembled and cleaned, which not only does not affect the normal use of the equipment, but also solves the problems of poor wear resistance, corrosion resistance, low service life and difficulty in replacement in the prior art.

[0027] Please refer to Figure 1 , the present invention provides a filtering device for a circulating water system. The filtering device includes a frame 100, an operation platform 102, a first filtering structure 110 and a second filtering structure 120. The frame 100 is used to support each structure of the filtering device. The operation platform 102 is arranged on the frame 100 and is used for overhauling or cleaning the filtering structure. The first filtering structure 110 is a fixed filtering structure and is fixedly installed on the lower layer of the frame 100. The second filtering structure 120 includes a first-layer filter screen 121 and a second-layer filter screen 122. The first-layer filter screen 121 and the second-layer filter screen 122 are detachably installed on the upper layer of the frame 100. The second filtering structure 120 adopts a double-layer movable filter screen structure. When overhauling or cleaning, it can be disassembled from the frame 100. Since it is a double-layer structure, it can be disassembled layer by layer. After the first-layer filter screen is overhauled and put into use again, the second-layer filter screen is disassembled. In this way, the purpose of overhauling and cleaning can be achieved, and the normal use of the equipment is not affected, ensuring the heat exchange effect of the power generation equipment and efficient power generation.

[0028] Please refer to Figure 1, the frame 100 is installed at the inlet of the water inlet pipe and completely covers the water inlet pipe at the inlet. The structure of the frame 100 can be any structure that can meet the filtration requirements of the circulating water system. In one embodiment, the frame 100 is a cuboid structure, and the square structure has better stability. Specifically, the frame 100 includes a number of struts 101, and the number of struts 101 are staggered along the length, width, and height directions of the cuboid to form a cuboid frame. The cuboid frame is based on the bottom of the circulating water tank, and one of its sides is close to the pool wall of the circulating water tank. For example, expansion bolts are drilled and installed on the bottom and side walls of the circulating water tank, and the bottom of the cuboid frame and the struts 101 on the side close to the pool wall of the circulating water tank are fixed in the circulating water tank through the expansion bolts. The first filtration structure 110 and the second filtration structure 120 are installed on the other three sides of the cuboid frame. With this installation method, the frame can not only play a filtering role, but also be supported to a certain extent by the circulating water tank, making the structure more stable. The specific dimensions of the frame 100 are not limited here and can be customized according to the dimensions of the circulating water tank and the inlet size of the water inlet pipe. For example, the length of the frame 100 is 2.5 m, the width is 2 m, and the height is 4 m. The material of the frame 100 needs to meet the support strength of the overall structure and have good impact resistance, wear resistance, and corrosion resistance, such as stainless steel, etc.

[0029] Please refer to Figure 1 , the operation platform 102 is mainly used for overhauling or cleaning the second filtration structure 120. The operation platform 102 is fixed on the frame 100 along the direction parallel to the bottom surface of the frame 100, and its specific installation position is determined according to the water level in the circulating water tank. The operation platform 102 needs to be installed above the water surface. When the second filtration structure 120 needs to be repaired or cleaned, the second filtration structure 120 can be disassembled from the frame 100 and repaired or cleaned on the operation platform 102. Preferably, a safety guardrail 103 is provided around the operation platform 102 to prevent operators, maintenance tools, etc. from falling from the platform during the overhaul or cleaning process. Further, the operation platform 102 is welded by stainless steel angle steel. On the one hand, the stainless steel material has excellent anti-corrosion and wear resistance, and on the other hand, the angle steel is convenient for welding.

[0030] Please refer to Figure 1 , the first filtration structure 110 is a fixed filter screen structure, which is installed on the lower layer of the frame 100. The first filtration structure 110 can adopt a conventional filter screen structure, for example, a filter screen frame and a filter screen, and the filter screen is fixedly installed on the filter screen frame. The second filtration structure 120 is a movable double-layer filter screen structure, which includes a first layer of filter screen 121 and a second layer of filter screen 122 arranged in a stacked manner. The double-layer filter screen structure not only has a more excellent filtration effect, but also can be disassembled layer by layer during maintenance without affecting the normal use of the equipment.

[0031] Please refer to Figure 1 andFigure 2 In one embodiment, the first layer of filter screen 121 includes a filter screen frame 1211, a filter screen 1212, and a pressing frame 1213. The filter screen frame 1211 is a square structure, and its length and width are determined according to its specific installation position on the frame 100. Preferably, the inside of the filter screen frame 1211 is provided with crisscross frame supports, which divide the square frame into several small squares to enhance the support strength of the filter screen frame. The filter screen 1212 is installed on the filter screen frame 1211 to block the small squares inside the filter screen frame 1211, and the pressing frame 1213 presses the filter screen 1212 onto the filter frame 1211. Further, a net pocket 1214 for supporting the filter screen 1212 is provided at the bottom of the filter screen frame 1211. The filter screen 1212 is pre-installed on the filter screen frame 1211 through the net pocket 1214, pressed by the pressing frame 1213, and then fixed by bolts. The size of the filter screen frame 1211 is determined according to its specific installation position on the frame 100. Preferably, the filter screen frame 1211 is welded by stainless steel angle steel, the filter screen 1212 is made of stainless steel wire mesh, and the pressing frame 1213 is made of stainless steel flat steel. Of course, other corrosion-resistant and wear-resistant materials can also be used. The second layer of filter screen 122 has the same structure as the first layer of filter screen 121.

[0032] Please refer to Figure 1 In one embodiment, the filtering device further includes a lifting device 130. The lifting device 130 is installed above the frame 100 and is used for disassembling and installing the second filtering structure 120. The lifting device 130 includes a hoisting mechanism 131 and a first guide rail 132. Among them, the first guide rail 132 is installed on the pillar 101 in the height direction of the frame 100. The first layer of filter screen 121 and the second layer of filter screen 122 are slidably installed on the first guide rail 132. The hoisting mechanism 131 is installed on the top of the frame 100 and can be connected to the first layer of filter screen 121 and the second layer of filter screen 122. When the second filtering structure 120 needs to be disassembled, the hoisting mechanism 131 is connected to the first layer of filter screen 121 or the second layer of filter screen 122, and the hoisting mechanism 131 is used to drive the first layer of filter screen 121 or the second layer of filter screen 122 to slide along the first guide rail 132 towards the top to adjust it to the operation platform 102, and perform daily maintenance or cleaning on it on the operation platform 102. After the maintenance or cleaning is completed, the hoisting mechanism 131 is used to reset and put into use the first layer of filter screen 121 or the second layer of filter screen 122. Preferably, a lateral support and / or a longitudinal support are also provided between two adjacent first guide rails 132 to enhance the strength of the frame. The first guide rail 132 can be made by welding stainless steel channel steel, and the groove inside the stainless steel channel steel can be used as the sliding track for the first layer of filter screen 121 or the second layer of filter screen 122.

[0033] Please refer to Figure 1 and Figure 3, the hoisting mechanism 131 includes an electric hoist and the running guide rail of the electric hoist. Here, the running guide rail of the electric hoist is denoted as the second guide rail 1311. The second guide rail 1311 is arranged at the top of the frame 100. The electric hoist is installed on the second guide rail 1311 and can slide along the second guide rail 1311. The electric hoist can adopt a conventional hoisting mechanism. For example, the electric hoist includes a traveling trolley 1312, a drum 1313, a driving motor 1314, a movable pulley 1315, a hook 1316, and a cable 1317. Among them, the traveling trolley 1312 is installed on the second guide rail 1311 and travels on the second guide rail 1311; the drum 1313 is installed in the traveling trolley 1312, and the driving motor 1314 is installed in the traveling trolley 1312 and drives the drum 1313 to rotate so that the cable 1317 is wound around the drum 1313 or let down from the drum 1313; the movable pulley 1315 is arranged below the traveling trolley 1312 and a hook 1316 is fixedly connected to its bottom. There are also a rope head fixing part 1318 and a stationary pulley assembly 1319 at the position of the traveling trolley 1312 corresponding to the drum 1313. One end of the cable 1317 is fixed to the rope head fixing part 1318, and the other end is wound around the drum 1313 and passes through the movable pulley 1315 and the stationary pulley assembly 1319. By using the movable pulley 1315 to connect the cable 1317 to the rope head fixing part 1318 and the drum 1313, the weight borne by the drum 1313 is reduced by half, which can effectively reduce the output power of the driving motor 1314 or double the maximum lifting weight of the electric hoist.

[0034] Further, the second guide rail 1311 is, for example, made by welding I-beams. The troughs on both sides of the I-beam can be used as the running tracks for the rollers of the traveling trolley 1312.

[0035] Further, suspension parts 1215 are provided at the tops of the first filter screen 121 and the second filter screen 122, which are convenient for the hook 1316 of the hoisting mechanism 131 to hook the first filter screen 121 and the second filter screen 122.

[0036] Please refer to Figure 1 , a ceiling 140 is also provided at the top of the frame 100, which is used to block rainwater or other physical damages to increase the service life of the filtering device.

[0037] When the filtering device of the present invention is installed, first fix the frame 100 in the circulating water tank. For example, install expansion bolts at the bottom of the circulating water tank and on a pool wall in close contact with the frame, and use the expansion bolts to fix the frame in the circulating water tank; then fix the first filtering structure 110, for example, by welding, to the lower layer of the frame 100; weld the first guide rail 132 of the lifting device 130 to the support column 101 of the frame 100, and sequentially place the first layer of filter screen 121 and the second layer of filter screen 122 of the second filtering structure 120 into the first guide rail 132, weld the operation platform 102 and the safety guardrail 103, apply a paint anti-corrosion layer to the part above the circulating water surface, and then install an electric hoist and a ceiling 140 on the top of the frame 100. After the installation is completed, it can be used. Further, the materials of the underwater part of the filtering device are all selected as stainless steel materials that are impact-resistant, wear-resistant, and corrosion-resistant, such as 316 stainless steel, to enhance the service life of the filtering device. During the daily operation process, when the filter screen needs to be cleaned, first use the lifting device 130 to lift the first layer of filter screen 121 out to the operation platform 102 and wash it with a high-pressure water gun. After the cleaning is completed, then use the lifting device 130 to reset the first layer of filter screen 121 and put it into use; then lift the second layer of filter screen 122 out to the operation platform 102 for cleaning, and after the cleaning is completed, also reset it and put it into use. This design will not affect the normal use of the filtering device.

[0038] The present invention also provides a circulating water system, which includes a condenser, a cooling tower, a circulating water tank, and a circulating water pump. Among them, the cooling tower cools the circulating water entering it to a certain temperature and flows it into the circulating water tank. The water in the circulating water tank is sent to the condenser by the circulating water pump. After exchanging heat with the steam in the condenser, it is sent to the cooling tower through the circulating water pipeline to form a cycle of cooling water. The circulating water system also includes the filtering device of the present invention, and this filtering device is installed in the circulating water tank and covers the inlet of the water inlet pipe.

[0039] It should be noted that the parts not detailed in the above water circulation system can be obtained by conventional technical means.

[0040] The filtering device of the present invention is provided with a fixed filtering structure filter screen in the lower layer and a movable filtering structure in the upper layer. When the debris in the circulating water increases, the movable filtering structure can be disassembled and cleaned. Moreover, the movable filtering structure is set as a double-layer filter screen structure and can be disassembled and cleaned layer by layer without affecting the normal use of the equipment, effectively solving the problems of poor wear resistance, poor corrosion resistance, low service life, and difficulty in replacement in the prior art, making the filtering device more reliable in use and longer in service life, ensuring the heat exchange effect of the power generation equipment and efficient power generation. Therefore, the present invention effectively overcomes some practical problems in the prior art and thus has high utilization value and practical significance.

[0041] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A filtering device for a circulating water system, characterized in that, Comprising: A framework; An operating platform, installed on the framework, A first filtering structure, fixedly installed on the lower layer of the framework; And A second filtering structure, which includes a first-layer filter screen and a second-layer filter screen, and the first-layer filter screen and the second-layer filter screen are detachably installed on the upper layer of the framework; Wherein, the framework includes a plurality of struts, and the plurality of struts are arranged alternately to form a cuboid framework; The filtering device further includes a lifting device, and the lifting device includes a hoisting mechanism and a first guide rail. The first guide rail is installed on the struts of the framework, and the first-layer filter screen and the second-layer filter screen are slidably installed on the first guide rail. The hoisting mechanism is installed on the top of the framework and drives the first-layer filter screen and the second-layer filter screen to slide along the first guide rail.

2. The filtering device according to claim 1, wherein The framework is provided with a fixing surface and a mounting surface. The fixing surface faces the wall of the circulating water tank and fits tightly, and the first filtering structure and the second filtering structure are installed on the mounting surface.

3. The filtering device according to claim 1, characterized in that, The first-layer filter screen includes a filter screen framework, a filter screen and a pressing frame. The filter screen framework is provided with a mesh pocket for supporting the filter screen. The filter screen is installed on the filter screen framework and is fixedly pressed by the pressing frame. The structure of the second-layer filter screen is the same as that of the first-layer filter screen.

4. The filtering device according to claim 1, characterized in that, A plurality of supports are provided between adjacent first guide rails, and the plurality of supports include transverse supports and / or longitudinal supports.

5. The filtering device according to claim 1, characterized in that The hoisting mechanism includes an electric hoist and a second guide rail. The second guide rail is installed on the top of the framework, and the electric hoist is installed on the second guide rail and slides along the second guide rail.

6. The filtering device according to claim 5, characterized in that, Both the top of the first-layer filter screen and the top of the second-layer filter screen are provided with hanging parts that cooperate with the hooks of the electric hoist.

7. The filtering device according to claim 1, characterized in that, The filtering device further includes a ceiling, and the ceiling is fixedly installed on the top of the framework.

8. The filtering device according to claim 1, characterized in that, A safety guardrail is provided around the operating platform.

9. A circulating water system, characterized in that, Including the filtering device according to any one of claims 1 to 8, and the filtering device is fixedly installed in a circulating water tank.

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