Equipment for treatment of oily sewage in engine room bilge
This device can be used to treat the oily sewage in the bilge of the engine room of the ship to meet the requirements of IMO MEPC.107 (49) resolution.Including type approved15ppm bilge water separatorAnd 15ppm bilge water alarm device and automatic shutdown device.
Maximum treatment capacity (without emulsified oil)
0.31 m/h
0.625 m/h
Oil content of drainage fluid
≯15ppm
Electric heater power
3kw
3kw
Electric system
380V,50Hz、3Φ
Plunger pump
Motor power
0.37kw
0.75kw
Suction height
≯5 m-H2O
Discharge pressure of discharge liquid
5～10 m-H2O
Overall dimension (length × width × height)
1000×600×1320mm
1100×690×1460mm
weight
dry weight
～300kg
～500kg
wet weight
～450kg
～700kg
For oil concentration meter, please refer to the Operation Manual of Oil Concentration Meter (attached separately).
working principle
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The unit adopts the principle of primary inclined plate gravity and coalescence separation - secondary fiber filter - tertiary ultrafiltration membrane infiltration separation, so that the oily bilge water can meet the discharge standard of IMO MEPC.107 (49) resolution.
As shown in Fig. 1 (322DF-3-00XT), the bilge water of the ship enters the primary separator due to the suction of the plunger pump, and the internal part is in vacuum negative pressure state, which avoids the problem of difficult separation of oily bilge water caused by agitation and emulsification of oily bilge water in the past pressure state.The discharged liquid from the plunger pump is absorbed and filtered by the secondary fiber filter, and then enters the tertiary ultrafiltration, which can ensure that the oil content in the discharged liquid will not exceed the standard.
The oil concentration meter (i.e. 15ppm bilge water alarm device) is used to measure the oil concentration of the discharged liquid. If the oil concentration of the measured discharged liquid exceeds the standard, it will automatically turn to tertiary processing.
If the oil concentration of the discharged liquid exceeds the standard and the oil concentration meter gives an alarm, the pneumatic valve for discharging unqualified water will be opened, so that unqualified water will be discharged to the bilge instead of being discharged overboard.
Installation requirements
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Device base
All parts of the device are installed on a "device base" welded by channel steel.A "ship base" matching the size of the base of the device shall be designed in the onboard engine room.The "ship base" is welded to the hull structure."Ship base" and "device base" are connected by bolts, and it is recommended to useChannelSquare slantWasherGB/T853。
See Fig. 2 for the size of device base and the arrangement of connecting bolts.
Piping connection
The diameter of bilge oil sewage suction inlet, discharge liquid outlet, clean water inlet (not more than 0.3MPa), and the return of tertiary ultrafiltration concentrate to bilge water are DN20, and the oil outlet is DN20.The oil drain valve and seawater filter are separately packaged and connected by the shipyard.Refer to Figure 3 Outline Drawing and External Interface Drawing.
4.3 Electrical connection
The power supply AC380V, 3 Φ, 50Hz enters the electrical control box;The bilge water level probe is led to the bilge water collecting well of the engine room.Refer to 322DF-3-00YL. When leaving the factory, the external contact points # 5, # 6 or # 7 of the liquid level relay JYB3 for detecting the bilge water level are shorted in advance. If it is necessary to connect JYB3, remove the short copper wire.
Note: The operator must have certain technical knowledge, read this operation manual, master the operation essentials, and understand the maintenance instructions.
System flow
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See Figure 1 of the system diagram
The bilge oily sewage enters the primary separator through the suction bottom valve, the seawater coarse filter (specially provided, 24 mesh filter screen), and the float check valve V1. The top of the separator is equipped with an oil collecting chamber. Most of the oil in the bilge oily sewage floats up to the top of the oil collecting chamber of the separator by means of the specific gravity difference, and the fine oil drops coalesce in the inclined plate of the hydrophilic and oil draining material, and float up in a "reverse same direction" classification;The water flows from the bottom drainage port to the suction port of the plunger pump, where there is a pneumatic valve Vs3. When the plunger pump runs, Vs3 automatically opens, while the flushing water valve Vs2 closes.
When the oil accumulates to a certain amount at the top of the primary separator, the oil level rises, the oil-water interface meter sends a signal, the pneumatic valves VS2 and VS3 close and open automatically, the clean water enters the primary separator from the bottom, and the jacked floating oil is discharged to the sump tank through the pneumatic oil drain valve VS1 (VS1 is a normally closed valve).At this time, the plunger pump does not work.Automatically reset after oil drainage, and continue to treat oily sewage in the bilge.
The oily sewage treated by the primary filter enters the secondary filter for further treatment and then is discharged overboard.If the oil discharge exceeds the standard, it will automatically turn to three-stage treatment. Close Vs4 and open Vs5, so that the excess water will enter three-stage ultrafiltration for further treatment.The three-stage ultrafiltration adopts the permeation principle. The filtrate flows from the outlet check valve V5 to the sea valve.
After the third stage ultrafiltration enters the liquid and permeates the water, it will be concentrated into concentrated liquid, which will be discharged to the bilge through V6.Yield recovery rate of ultrafiltration η=yield/inflow.The recovery rate of the unit is set at η=80%, so at this time, the water yield=0.8 × 0.31m/h=0.25m/h, and the opening of V6 has been set at the factory.If any change is found, you can adjust the flow of concentrated solution by adjusting V6.The recovery rate should not be too high, or the concentration polarization will occur if the concentrated solution is too thick, which will affect the life of the membrane.
The three-stage ultrafiltration membrane needs to be kept in water, which has been filled with maintenance fluid before leaving the factory, and the inlet and outlet valves are closed.Do not open these valves during unpacking installation until water injection operation. Open these valves before starting the device.
This device adoptsElectric heaterTo heat the temperature in the oil collecting chamber to about 40 ° C.The temperature is determined byElectric contact thermometerControl the on-off of the electric heater, which is very important for oil drainage, especially in the case of heavy residual oil, is conducive to the separation efficiency of the separator and reduces the possibility of blockage.
Two pressure gauges measure the inlet and outlet pressure of the secondary filter respectively.On the primary separatorVacuum pressure gaugeIt is used to observe the vacuum pressure in the cylinder and protect the safe operation of the plunger pump.
The oil concentration meter will automatically sample and monitor the oil concentration in the discharged liquid.When the oil content of the discharged liquid exceeds the standard, the oil concentration meter will give an alarm.At this time, the oil concentration meter will automatically close the VnC pneumatic valve and open the VnO pneumatic valve, and the unqualified water will be discharged back to the bilge;And send the alarm signal to the engine room central control room.The device requires that the back pressure of drainage water is 5~10m-H2O. If the back pressure is less than 5m-H2O, anti siphon pipe can be set on the drainage pipeline to prevent water from flowing out of the cabin.
The process piping to be connected on board includes: bilge water suction bottom valve and piping;Pipe system from oil drain to waste oil tank;Clear water access pipe system;Pipe system for sludge discharge to bilge or other spaces;Qualified water discharge overboard pipeline system and concentrated liquid return bilge pipeline system.
Before the initial operation, it is necessary to inject water into all vessels and piping systems. When injecting water, use the "change-over switch" on the electrical control box to make Vs2 open, water enters from the bottom of the primary separator, and then from bottom to top, through the sludge discharge valve V2, water test valve C2, and vent cock C1, you can gradually know which part of the water has been injected. When water flows out, close the valve tightly until the top vent cock,Know whether the water is full.
Oil concentration meter, i.e. 15ppm bilge water alarm device, see the "Operation Manual" for details.
Warning: This device uses 380V power supply, which may cause casualty accidents such as electric shock. The operator must be cautious, and should not open the door of the electrical control box to visit without authorization. During the maintenance of the electrical system, the power supply must be cut off.It must be operated by professionals.
Operation
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6.1 Normal operation
As follows:
(1) Open the door of the electrical control box with the key, close the main power switch QF0, and check whether the power supply is normal.
(2) Close the plunger pump power switch Q4, and the plunger pump should not run at this time.
(3) Close control power 380V switch Q5;Electric heaterPower switch Q8.Close the door of the electrical control box.
(4) Close the switch on the oil concentration meter.
(5) Turn on the "Control Power" 220 V switch Q6 on the door panel, and the control power indicator H0 should be on.
(6) Unscrew the "Oil Concentration Meter Switch" Q7, and the corresponding indicator on the "Oil Concentration Meter" should be on.Adjust according to the operation manual of the oil concentration meter.
(7) Turn the change-over switch Q3 of Manual and Automatic Oil Discharge, Backwash and Water Injection to "Manual". At this time, the indicator light H4 of Valve Vs1 and Vs2 Open should be on, indicating that water injection is in progress.Water can be seen flowing from the test cocks of the primary separator, and gradually close them from bottom to top until they reach the highest point, indicating that they are full of water.
(8) Turn the change-over switch Q3 of Manual and Automatic Oil Discharge, Backwash and Water Injection to "Automatic" and stop water injection.After normal operation, if the oil on the top of the primary separator accumulates to a certain thickness, the control system will automatically drain the oil and return to normal operation automatically after the oil is drained.
(9) Turn the change-over switch Q10 of Level III Processing to "Automatic".
(10) Press the Plunger Pump Start button QA manually, the plunger pump will run, and pay attention to the steering.Observe the "vacuum and pressure gauge" from zero to － 0.01MPa and between － 0.01MPa and － 0.05MPa, which is normal.
(11) If the oil concentration meter fails, you can force the change-over switch Q10 of the "Three stage Treatment" to "Manual On", so that the water can be forced into the third stage through VS5.Check whether VS4 is off;Whether VS5 is on.Check the relative position of the opening pointer on the top of the pneumatic valve.Observe the "pressure gauges" of Level 1 and Level 2. If there is pressure, Level 3 is in operation.V3 is fully open, adjust the opening of V6 to maintain the reading of rated water yield, that is, 0.25m/h.
(12) Adjust the temperature of electric contact between 35 ℃ and 40 ℃, the electric heater will automatically open and close, and adjust the inlet water temperature within the above range.The working temperature of the membrane shall not exceed 50 ℃.So far, the device operates normally.
6.2 Abnormal conditions may include:
(1) When the bilge water suction pipeline or suction filter is blocked, and the vacuum degree in the primary separator may exceed - 0.05MPa, the plunger pump will automatically protect and stop working. The person on duty should check and take measures to eliminate the blocking problem.When the bilge water is sucked up, the air will enter the primary separator, and the vacuum degree in the separator will be damaged. When it is less than -0.01MPa, the plunger pump will automatically protect and stop working. The person on duty should check the bilge water level.If the bilge water probe JYB3 of this device is used on board, the possibility of this problem is relatively small, and the device will automatically start and stop according to the level of bilge water.If the oil concentration meter alarms for a long time, the device needs to be cleaned.First, the first stage separator shall be manually backwashed to see if the separation efficiency of the first stage separator is reduced?Secondly, observe the secondary and tertiary pressure gauges to see if the differential pressure is too large. If so, replace the corresponding filter element.At this time, water must be drained manually, the cover must be opened, a new filter element must be replaced, the cover must be closed, and then water must be added.The secondary filter is most likely to be blocked and should be replaced frequently.For the sludge discharge of the primary separator, the oil at the top of the primary separator will often be discharged automatically, and the sludge at the bottom needs to be discharged manually on a regular basis.Sludge will affect the blocking of subsequent filters.The method of sludge discharge is to turn the change-over switch of Manual and Automatic Oil Discharge, Backflush and Water Injection to "Manual", open the discharge valve V2 at the bottom of the primary separator at the same time, and flush out the sediment through clean water.
6.3 Device shutdown:
Once the device is started up for normal operation, it can automatically pump the bilge water for operation or stop according to the amount of bilge water, without personnel operation.If the ship is stopped for a long time, the engine room attendant can take shutdown measures when confirming that the device does not need to be operated.Press the Stop button of the plunger pump first, the pump stops working, and the plunger pump working indicator H3 is off.Then disconnect the control power supply Q6, K2, K20, K5 and K6, all of which lose power, and the corresponding pneumatic valves Vs1, Vs2, Vs3, Vs4, Vs5, Vs6 and Vs7 automatically reset.
Note: The device is controlled by a pneumatic valve through a pneumatic electric conversion solenoid valve. Compressed air is supplied from the ship, 0.25~0.40MPa. First, it enters the air source filter, which is equipped with an electric contact pressure gauge. If the compressed air loses pressure, in order to protect the plunger pump from dehydration and dry running, Y101 contact of the electric cabinet is disconnected, and the device cannot be started.The compressed air inlet valve can be closed during shutdown.
Warning: The motor of the plunger pump of this device is a rotating part. When approaching the rotating part, the staff must pay attention to safety to prevent clothing, pants and other objects from getting involved, causing injury.
Maintenance
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7.1 When the inclined plate separator in the primary separator needs to be cleaned, use clean water for backwashing. At this time, turn the "change-over switch" Q3 on the electrical control box to "manual" for backwashing, close the oil drain valve on the waste oil tank on board, and open the backwash return valve to allow clean water to enter the bottom from VS2, drain from the top VS1, and allow water to return to the bilge.When the bottom sludge valve is opened at the same time, the garbage at the bottom of the separator can be cleaned.Depending on the pollution, it shall be carried out once every 6 months, with 15 minutes for each backwash.
7.2 Replace the filter element of the secondary filter. As can be seen from the primary and secondary pressure gauges, if the differential pressure between the inlet and outlet of the secondary filter is greater than 10m-H2O (100KPa), it indicates that the secondary filter is seriously blocked, and it should be shut down to drain the liquid in the secondary filter, open the upper cover, take out the blocked filter element, replace it with a new filter element of the same specification, and then cover the top cover. On average, replace it once a year.
