1. HQS-ZN Smart Water Shearing System
The third generation of smart water shearing device developed by our company is supported by density sensor and capacitive sensor, which monitor the two predominant features of oil-water in real-time and is able to determine the oil content of the effluent accurately. At the meantime, the device is equipped with built-in logical relationship which regulate the drainage valves to drain water away from the bottom of oil tanks automatically, stably and continuously. With automatic power resetting, fault resetting, remote monitoring and warning function, the function of the device is reliable.
Ⅱ System Composition
2，Principle of Work
The smart water shearing device is composed of the following components: Siemens PLC, key sensing unit, secondary sensor, pneumatic or electromotor stop valve, communication, computer monitoring, diversion pipe, heating and insulation.
The device can be monitored both on site and by remote control. Parameter of oil density, capacitance, temperature, threshold level, open feedback of control valve, maximum opening setting etc. be able to fareastone through RJ45/Ethernet(optical) or Modbus/RS-485 to DOS system in control room or industrial control computer and be monitored.
There are two oil probes in the pipe of water shearing device. Water settling onto the bottom of oil tank will get into water shearing device. And when the two probes monitored that oleaginousness in the water is lower than certain threshold value, valve will open and dewatering begin. Size of opening will be automatically adjusted in accordance with level of oleaginousness.
Valve will close when anyone of the probes monitors that oleaginousness is higher than given oleaginousness level. Medium in the device will layer by automatic settling, and oil in the upper layer will be replaced by water in oil tank and back into the tank gradually; at the same time, water level in the device rises until both of the two probes monitor that oleaginousness of the water is higher than given value and valve will open and dewatering begin again. The process will circulate until all water in oil tank be dehydrated up.
The device is made of stainless steel and is of streamlined structure, which made it possible that secondary settlement and termly manual cleaning is not needed. Also, there is no dead spots and no impurities accumulation. The device is able to work on line in the open air in all-weather. All works are done in confined space. Anti-freezing measures is applied in the device, which made it possible to work in winter.
Ⅲ Main features of HQS-ZN
1, Density sensor and capacitive sensor, which possess different natures were equipped. Oleaginousness can be monitored accurately. And compound means of detection method makes the system more reliable. In addition, probes applied are of good pollution resistibility.
2, Siemens PLC is taken as main control unit. Its stable performance, powerful instruction set and standard communication protocol enable the device to conduct monitoring both on-site and from distance (DCS or Industrial Personal Computer).
3, Control valve is of international top brand. And size of opening can be adjusted in real-time in accordance with oleaginousness.
4, Sound security assurance: fareastone, warning, power resetting, fault resetting.
5, Concatenation of main control valve and subordinate shutoff valve is applied, which ensures that there will be no leaking.
6, Stainless steel and streamlined structure are applied, and steadiness of flow, speediness od flow and lifetime of system are ensured.
7, Waterproofing grade: over IP65. The device is able to work on line in the open air in all-weather. No maintenance is needed.
8, Anti-hazard classification of components consistent with national standards and accommodates field environment.
1 Power Supply: DC 24V or AC 220V±10% 、50Hz±1%、（ground connection needed);
2, Power: 30W（PLC control and valve actuator);
3, Environment Temperature: -40～60℃;
4, Application: in the open air
5, Pressure of Air supply: 0.4～0.8 Mpa;
6, Steam pressure of heat tracing: 0.1～1.0Mpa.
Ⅴ. Main technical parameters of HQS-ZN
1，Ex mark： ExdⅡBT4, protection class: IP65;
2, Communication: RJ45/Ethernet(optical) or Modbus/RS-485 communication
3, Output: a, RJ45/Ethernet(optical); b, Modbus/RS-485 communication; c, DC 4-20mA；
4, Dewatering Amount: 0～40T (adjustable);
5, Oleaginousness of Dewatering: less than 80ppm (settable)
6, Monitoring: field control, DCS connection, industrial computer connection;
7, Density Probe: measurement accuracy ±1kg/1000kg, repeated accuracy ±0.2kg/1000kg;
8, Density of Capacitance Probe: 0.1P;
9, Operational Mode: Online and all-weather.