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    Secondary filter screen
    Secondary filter screen
    Secondary filter screen
    Secondary filter screen

    Secondary filter screen

    The secondary filter system is used to purify water pollutants and keep the water chamber of the condenser in a clean state. The fixed secondary filter and the rotating negative pressure backwash secondary filter, which are commonly used in the open circulation system for cooling water, have shown their shortcomings.
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    The secondary filter system is a device designed and developed to purify water and dirt, maintain the cleanliness of the condenser water chamber, ensure the normal operation of the rubber ball, and improve the rubber ball recovery rate. But I, the environment is relatively strict, especially the water pollution of rivers and lakes. Therefore, the open-loop cooling water system, which commonly uses fixed secondary filters and rotating negative pressure backwash secondary filters, has shown its shortcomings. Through continuous solicitation of opinions from users and repeated trial production and improvement of secondary filters in recent years, some structures have been retained, electric devices have been added, and strong sewage discharge devices have been added to improve the structure and usage of secondary filters. They have been applied to the cooling water open cycle system of 6MW to 300MW thermal power generator sets.


    Secondary filter - outlet potential:


    The circulating water system of condensers in various power plants (stations) - two commonly used secondary filters, fixed secondary filter and rotary secondary filter, have been proven to have the following main problems:


    1. Fixed secondary filter -:


    The fixed core of the secondary filter screen cannot rotate, and the cleaning effect is poor. The mesh holes are prone to blockage, and the cleaning needs to wait for the machine to stop.


    2. Rotating secondary filter -:


    During the rotation and cleaning of the secondary filter core, it relies on negative pressure backwashing. This filter has a stronger cleaning ability than the fixed type. However, during the peak flood season, when the cargo water pollution is severe, and the water contains plastic film. When weeds and other highly adhesive pollutants are cleaned, the cleaning results are still not taken care of. If the scraper in the sewage chamber is severely worn, the cleaning results are poor


    There are also significant deficiencies in the secondary filter structure:


    (1) The secondary filter screen drives the mesh core, and the gears are prone to wear and corrosion during operation in water containing impurities such as sediment, which seriously affects the safety and economic operation of the unit.


    (2) The secondary filter transmission control system is relatively complex, usually composed of control solenoid valves, oil pumps, oil tanks, oil cylinders, oil motors, oil circuit control boxes, etc., which are prone to oil and control failures during operation.


    (3) The maintenance and repair workload of the secondary filter is large. In response to the shortcomings of the secondary filter mentioned above, our factory has conducted investigation and research on the secondary filter and repeatedly developed an electric rotary recoil secondary filter, which is a purposeful and efficient secondary filter


    The secondary filter has the following features:


    1. Eliminated the complex and prone to faults in the transmission system of the secondary filter, ensuring safe and reliable operation, and convenient maintenance and repair.


    2. Under the strict pollution of plastic film, a strong sewage discharge device has been added to overcome the situation of other secondary filter devices for plastic film cleaning.


    Secondary filter structure -:


    The electric rotary recoil type secondary filter structure is mainly composed of: ⑴ shell ⑵ stainless steel mesh core ⑶ transmission machine - ⑵ reducer ⑤ strong drainage device and other components.


    Working principle of secondary filter screen:


    The circulating water filtered through the trash rack and secondary filter still contains a lot of suspended solids, sediment and other impurities. After passing through the circulating water pump and entering the secondary filter, it is filtered again. When impurities such as water suspended solids and plastic films attach to a certain amount on the surface of the filter, the water pressure difference between the inside and outside of the secondary filter increases to the specified value in the control system (usually 500mmH2O column). The control system is activated and the sewage discharge machine is put into operation, Discharge the attached material from the secondary filter screen and wait for the pressure difference inside to return to normal (generally ≤ 400mmH2O column) to control the machine to shut down and cycle back and forth, thus completing the filtration and sewage discharge process. You can also choose to discharge pollutants on a scheduled basis according to the user's situation.


    The secondary filter can be installed vertically or horizontally in the condenser, or at the outlet of the circulating pump, with the same effect. The length of the filter - straight pipe - should be greater than the diameter of the circulating water pipeline. During installation, it should not be tilted and the connection should be firm. Maintain a distance of at least 1000mm between the filter screen and the secondary filter pipe of the circulating water in the condenser, and install a compensation joint between the filter screen and the condenser for easy repair, disassembly, and compensation purposes. After installation, it is necessary to remove any debris from the filter - circulating water pipe -, put it into operation, and conduct a running test. Backwashing water volume: not more than 5% to 10% of the total circulating water volume. Backwashing interval (set): 1-24 hours. Adjustable backwashing time (set): 0-10 minutes.


    Technical parameters of DE type fully enclosed electric pressure backwash secondary filter:



    型號進出水口公稱直徑(mm)凈水能力(t/h)通流倍率濾網(wǎng)-大直徑Φ(mm)長度±10%(mm)排污管數(shù)量規(guī)格(mm)過濾--(mm)
    DE-45045011403.282020002-DN2004-8根據(jù)用戶要求進行調(diào)整
    DE-50050014803.210202480
    DE-60060020353.611202580
    DE-70070027703.212202780
    DE-80080036203.113203030
    DE-90090045803.214203230
    DE-1000100056553.115203680
    DE-1200120081403.117204080
    DE-14001400110803.2197045302-DN250
    DE-16001600140803.222244880
    DE-18001800183203.024745300
    DE-20002000226203.127246000
    DE-22002200273703.13024


    FE型切換式反沖洗二次濾網(wǎng)技術(shù)參數(shù):

    型號進出水口公稱直徑(mm)凈水能力(t/h)通流倍率濾網(wǎng)-大直徑Φ(mm)高度±10%(mm)排污管數(shù)量規(guī)格(mm)
    FE-50050014802.87201200DN150
    FE-60060020352.88201500DN150
    FE-70070027702.89201600DN200
    FE-80080036203.210201700DN200
    FE-90090045803.211201800DN250
    FE-1000100056553.212202000DN250
    FE-1200120081403.214242276DN300
    FE-14001400110803.516242650DN300
    FE-16001600140803.518242650DN450
    FE-18001800183203.520242885DN450
    FE-20002000226203.522282895DN550


    WE系列外旋式二次濾網(wǎng)技術(shù)參數(shù):

    型號/尺寸ABCEFGHLJKLMPQT排污a人孔a放水a(chǎn)總-kg-機型號備注
    WE-500-l1124380
    85655022012246740550822804200824820180120300700DKJ-410
    WE-600-‖11244307519406242401224784066072411662009249202701203001000DQ120-A
    WE-700-‖1641483770110075024017418660780124112441714831080270603001200DQ120-A
    WE-800-‖1683588116313208203001765105308801205175530058813001802851801500Q120
    WE-900-‖16585881001142092031517701118092511981663
    588140028790287
    1800Q120
    WE-1600-‖32241010
    2550161840034001412014502224259118050024301802702904700SMC-00/H3BC


    二次濾網(wǎng)法蘭技術(shù)參數(shù):

    型號/尺寸-法蘭出口法蘭排污口法蘭放水口法蘭備注人孔門
    兩個人孔門
    兩個人孔門
    三個
    DD1D0n-dDD1D0n-dDD1D0n-dDD1D0n-d
    WE-500-l63559553316-Φ2263559553316-Φ2224021016112-Φ15.5240
    WE-600-‖73569563320-Φ2273569563320-Φ2224021016112-Φ15.5
    WE-700-‖86081072420-Φ2286081072420-Φ2224021016112-Φ15.52151851348-Φ15.5
    WE-800-‖96091082424-Φ2696091082424-Φ2636533033012-Φ1836533027512-Φ18
    WE-900-‖1060101092424-Φ261060101092424-Φ2636533033012-Φ181901601098-Φ15.5
    WE-1600-‖18001724162440-Φ3318001724162440-Φ3343039032812-Φ221901601098-Φ15.5


    注意:以上二次濾網(wǎng)技術(shù)規(guī)格參數(shù)僅供參考以實際設(shè)計為主。


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    Secondary filter screen生產(chǎn)廠家Copyright ? 2012-2023 Lianyungang Lingdong Electromechanical Equipment Co., Ltd all rights reserved

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    0518-85370171

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