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Drain tank typeSecondary filter screen生产厂家型号规格
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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.
  • Content details

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:


铂莱娱乐场1. Fixed secondary filter -:


铂莱娱乐场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.


铂莱娱乐场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.


铂莱娱乐场(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:



型号进出水口公称直径(mm)净水能力(t/h)通流倍率滤网-大直径Φ(mm)长度±10%(mm)排污管数量规格(mm)过滤--(mm)
DE-45045011403.282020002-DN2004-8根据用户要求进行调整
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型切换式反冲洗二次滤网技术参数:

型号进出水口公称直径(mm)净水能力(t/h)通流倍率滤网-大直径Φ(mm)高度±10%(mm)排污管数量规格(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系列外旋式二次滤网技术参数:

型号/尺寸ABCEFGHLJKLMPQT排污a人孔a放水a总-kg-机型号备注
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


二次滤网法兰技术参数:

型号/尺寸-法兰出口法兰排污口法兰放水口法兰备注人孔门
两个人孔门
两个人孔门
三个
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:以上二次滤网技术规格参数仅供参考以实际设计为主。


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