The Problem of Fuel Recirculation in Diesel Generators Part 1

Most on-site generator installations are based on diesel engines, which operate on diesel fuel. In a typical design, diesel fuel is stored in a large fuel storage tank. This type of main tank is generally installed outdoors (above ground or underground). Due to the limitations of the engine fuel pump, which has limited suction (or lifting) capacity, a daily fuel tank is usually required as a direct fuel source. The daily metering tank is close to the engine, allowing the engine driven fuel pump to reliably extract fuel. The daily measuring box can be designated as an independent (independent) design or a base type design (also known as a base type measuring box). In both cases, the fuel supply line of the engine is connected to the day tank, and the fuel return line of the engine is also the same.

Definition of the problem:

Diesel engines typically draw in more fuel than the combustion process requires (for example, a typical 2-megawatt generator draws in approximately 1135L/hour, but only consumes approximately 454L/hour at full load). The excess fuel extracted is used to cool and lubricate the fuel system of the engine. After cycling in the engine, this excess fuel returns to the fuel storage tank (i.e. the fuel tank). If left untreated, these "reflux" fuels will carry away heat (discharged by the fuel system) and, after prolonged operation, will raise the temperature of the fuel stored in the day tank.

Most engine manufacturers set a maximum inlet fuel temperature to allow the engine to produce its maximum rated output. When the imported fuel temperature exceeds 100 degrees Fahrenheit, the fuel density and lubricity will decrease. For every 10 degrees Fahrenheit increase in fuel temperature, the power of some engines will decrease by 1%. At around 165 degrees Fahrenheit, some engine protection systems will automatically shut off.

The impact of national norms and standards:

Emergency power supply systems (EPSS) are usually regulated and classified according to the standards of emergency and backup power systems, and operate for a certain minimum time after losing normal power supply. As part of the entire EPSS design, a reliable fuel supply system should ensure that the engine can operate within the shortest required time. Note: "Operation" should be understood as the ability of EPSS to withstand design loads, as stated in the Unified Fire Code.

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