Diesel choice

In the case of a backup pump that does not have enough power or that the pump is used as a contingency, a diesel engine can be used as the drive for the pump. Diesel engine from the diesel engine, suction system, exhaust system, fuel injection system, cooling system, water pump system, lubrication system, control system. The basic principle of diesel engine is to use compression ignition to make the fuel burn in the cylinder. Use high-temperature and high-pressure gas to make working substance, expand and promote the reciprocating motion of the piston in the cylinder, and convert the reciprocating motion to the crankshaft through the piston-connecting rod and crank mechanism Rotating movement. Through the intake, compression, combustion, expansion and exhaust process, the fuel in the cylinder to do work, four-stroke diesel engine crankshaft to complete a cycle of two revolutions, two-stroke diesel engine crankshaft per revolution to complete a cycle, by controlling the fuel injection The amount of output torque can be controlled. Diesel thermal efficiency is higher, generally 35% to 40%. First, the operational data and features 1. Speed ​​Diesel engine speed can be divided into high-speed, medium speed and low speed; and pump speed is almost the same. Medium speed: 750 ~ 1500r / min; Low speed: When driving the centrifugal pump, select the medium speed diesel engine, for the continuous operation of the pump, you can choose a lower speed; for question or short-term operation of the pump , You can choose a higher speed. Diesel-driven reciprocating pump, the choice of low-speed diesel engine. 2. Output Power Diesel output power and atmospheric conditions related to the same diesel engine in different environmental conditions, the output power is different, several commonly used terms of power are: (1) Rated Power (Manufacturer) specified, the diesel engine Output power under certain environmental conditions. (2) The ISO power is the output power of a diesel engine under the standard reference conditions given in IS0 15550, Internal combustion engines-Determina- tion and method for the measurement of engine power-General requirements. Standard reference conditions are: Atmospheric pressure Pr 100kPa; atmospheric temperature Tr 298K (25 ° C); relative humidity фr 30%; coolant (inlet cooling) temperature: Tcr, 298K (25 ° C). (3) Service Power The output power of a diesel engine under the most demanding environmental conditions at the place of use. The service power of a diesel engine generally requires 10% more power than the pump needs. (4) Continuous Power (Continuous Power) Diesel engine in the specified speed and environmental conditions, the power can be continuously issued. (5) Overload Power Diesel engine in the specified environmental conditions and conditions of use, the maximum allowable output power, the time allowed for each l2h 1h. Figure 1-36 is a typical diesel engine speed - power operating area diagram, a zone for the continuous operation zone, Zone 2 for the intermittent operation zone, Zone 3 for short-time overload operation zone. Figure 1-37 is a typical diesel engine power - speed, torque - speed characteristics. Curve A is the curve of maximum power torque (overload curve), curve B is the curve of diesel engine intermittent operation, curve C is the curve of continuous operation of diesel engine. Figure 1-37 Typical power-speed, torque-speed characteristic The output power and fuel consumption of the diesel engine under different ambient conditions can be converted according to ISO 3046/1. As a general estimate, the following principles can be used: The altitude of the installation site of the diesel engine is> 500m, the power is reduced by 1% for every 100m increase; for the environment where the diesel engine is installed is ≥25 ℃, ℃, power reduction of 1%.

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