A Perfect Match of Diesel Generator and Water Pump
I. Core Composition of the System
Component |
Functional Description |
Typical Selection Reference |
Diesel Engine |
Supplies energy by converting chemical energy from diesel combustion into mechanical energy and then into electrical energy. |
20-500kW single/three-phase diesel engine generators (e.g., Cummins, Weichai, Yuchai) |
Water Pump |
Driven by electrical energy, the impeller rotates to pump and convey water. |
Centrifugal pump (Q=20-1000m³/h, H=10-50m) |
Electrical Control System |
Controls power on/off, protects circuit safety, and adjusts water pump operation parameters. |
Distribution box (including circuit breakers, contactors, monitors) |
Water Transmission Pipes and Fittings |
Transports irrigation water to farmland, including main pipes, branch pipes, sprinklers/drip irrigation tapes, etc. |
PE pipes (DN50-DN300), flange joints |
Fuel Supply System |
Provides fuel for the diesel engine generator, including fuel tanks, fuel pipes, filters, etc. |
20-1000L fuel tanks according to the consumption, with fuel filtration |
II. Selection Calculation and Equipment Matching Key Points
1. Water Pump Power Calculation
- Parameter Description:
- Q: Flow rate (m³/h), determined by irrigation area and water application rate (e.g., 10m³/h per mu of land).
- H: Head (m), needing to overcome terrain height + pipeline resistance (empirical formula: actual head = terrain height + 10% pipeline loss).
- ρ: Water density (1000kg/m³), g: Gravitational acceleration (9.8m/s²).
- η: Water pump efficiency (approximately 70%-85% for centrifugal pumps).
2. Generator Power Matching
- The rated power of the generator
, as the starting current of the water pump is 3-5 times the rated current, requiring a margin.
- Example:
- A farmland requires a flow rate of 50m³/h and a head of 30m, selecting a centrifugal pump (η=75%):
3. Pipe and Fitting Selection
- Pipe diameter calculation: Select the pipe diameter D based on the flow rate Q, with the flow velocity controlled at 1.5-2.5m/s, formula:
- Case: When Q=50m³/h and v=2m/s, \( D \approx 0.094m \), select DN100 (4-inch) PE pipe.
III. Typical Application Scenarios and System Configurations
1. Scenario Classification and Solutions
Application Scenario |
Requirement Characteristics |
Recommended Configuration |
Advantages |
Remote Mountainous Farmland |
No power grid, undulating terrain |
50-300kW diesel generator + high-head centrifugal pump (H=40-60m) + drip irrigation tape |
Adapts to mountain climbing with high water-saving efficiency (30%-50% more water-saving than flood irrigation) |
Large-Area Plain Irrigation |
Requires large flow rate, flat terrain |
50-500kW diesel generator + large-diameter centrifugal pump (Q=80-100m³/h) + sprinkler nozzles |
Wide coverage, single equipment can irrigate 200-500 mu |
Emergency Drought Relief |
Temporary water pumping, high mobility requirement |
30-200kW mobile generator + mobile water pump truck (with wheels) + hoses |
Rapid deployment, suitable for sudden drought or flood drainage |
2. Practical Case: 15-hectare Farmland Irrigation System
- Configuration:
- Diesel generator: 15kW (rated voltage 380V, frequency 50Hz).
- Water pump: 5.5kW three-phase centrifugal pump (Q=60m³/h, H=25m).
- Pipeline: DN90 PE pipe, main pipeline length 800m, branch pipes controlled in 4 zones.
- Irrigation method: Sprinkler irrigation, single nozzle coverage radius 15m.
- Operation Data:
- Irrigation per mu of land takes 2 hours, fuel consumption is approximately 1.2L/kW·h.
IV. System Advantages
- Strong independence: Not limited by power grid coverage, suitable for "plug and play" in remote areas.
- High mobility: Can be combined with a trailer to form a mobile irrigation unit, flexibly switching between plots. For special terrains, Allian power has newly developed a crawler-type self-propelled water pump unit, enabling more convenient mobile irrigation.
- Wide compatibility: Can adapt to various irrigation methods such as sprinkler irrigation, drip irrigation, and flood irrigation.
V. Efficient Operation and Maintenance Strategies
1. Energy Saving Optimization Measures
- Variable frequency speed regulation: Install a frequency converter to adjust the water pump speed according to soil moisture, saving 15%-30% energy.
- Parallel operation of multiple pumps: In large flow scenarios, use 2 small-power pumps in parallel to avoid single-unit full-load operation.
- Pipeline optimization: Reduce the number of bends, use pipes with smooth inner walls to reduce along-the-way resistance (every 100m of pipeline causes about 1-2m head loss).
2. Daily Maintenance List
Component |
Maintenance Cycle |
Operation Content |
Fault Warning Signals |
Diesel Engine Generator |
Every 50 hours |
Check oil level (needs to be ≥ lower limit of oil dipstick), replace diesel filter, clean air filter. |
Black smoke, unstable speed, abnormal noise. |
Electric Water Pump |
Every 100 hours |
Detect bearing temperature rise (≤70℃), clean impeller debris, replace mechanical seals. |
Abnormal vibration, reduced flow, water leakage. |
Electrical Control System |
Monthly |
Tighten wiring terminals, test leakage protectors, clean distribution box dust. |
Tripping, large voltage fluctuations, abnormal indicator lights. |
Fuel System |
Every 200 hours |
Clean fuel tank, replace three-stage filters (coarse filter + fine filter + oil-water separator). |
Difficult starting, reduced power. |
3. Safety Operation Key Points
- The generator needs to be grounded (ground resistance ≤4Ω) to prevent electric leakage and shock.
- Check the tightness of the fuel pipeline before starting to avoid fire caused by diesel leakage.
- Install a filter screen (aperture ≤2mm) at the water pump inlet to prevent debris from damaging the impeller.
- Operators must receive training and be familiar with the basic procedure of "power off before maintenance".
VI. Technical Advantages of Our Company
