Fuel system of emergency diesel power generator set for nuclear power station

The integrated design of the nuclear power emergency diesel generator set fuel system solves the problems of scattered equipment and freezing at low temperatures, and realizes modular layout and fuel heating, ensuring rapid start-up and stable operation of the diesel engine.

WO2025218324A1 Publication Date: 2025-10-23WUXI BRACH 703TH RES INST OF CHINA SHIPBUILDING IND CORP
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Patent Information

Application Number
PCT/CN2025/076927
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-04-17
Filing Date
2025-02-12
Publication Date
2025-10-23

AI Technical Summary

Technical Problem

The existing nuclear power emergency diesel generator sets have a scattered fuel system that cannot be modularized, and may freeze in low-temperature environments, making it impossible to guarantee a normal fuel supply.

Method used

An integrated fuel system was designed, including an internal circulation unit, a leaking oil unit, a fuel delivery unit, and a tanker unloading unit. It integrates equipment such as a diesel engine, a fuel booster pump, a fuel filter, and a cooler. Through modular arrangement and a fuel heating device, the stability of fuel supply is ensured.

Benefits of technology

It achieves a compact and reasonable layout of the fuel system, simplifies on-site installation and maintenance, ensures normal fuel supply in low-temperature environments, and ensures rapid start-up and stable operation of the diesel engine.

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Abstract

A fuel system of an emergency diesel power generator set for a nuclear power station, comprising a diesel engine (1), an internal circulation unit (2), a leakage fuel unit (3), a fuel conveying unit (4), a daily fuel tank (46), a fuel tank truck fuel discharging unit (5), and a main fuel storage tank (53), wherein a fuel inlet pipe (14), fuel injection pump fuel discharging pipes (15), and a high-pressure fuel pipe leakage pipe (16) are provided in the diesel engine (1), and a fuel booster pump (11) and a fuel duplex filter (12) are connected in series on the fuel inlet pipe (14); the fuel injection pump fuel discharging pipes (15) are connected to dirty fuel drums (13); the high-pressure fuel pipe leakage pipe (16) conveys return fuel to the leakage fuel unit (3); the internal circulation unit (2) comprises a standby fuel booster pump (23), a first fuel duplex coarse filter (22), and a return fuel cooler (21); the internal circulation unit (2) achieves fuel supply from the daily fuel tank (46) to the diesel engine (1), and when the return fuel of the diesel engine is cooled, conveys said return fuel to the daily fuel tank (46); the fuel conveying unit (4) is connected to the main fuel storage tank (53) and the daily fuel tank (46), and the fuel tank truck fuel discharging unit (5) conveys, to the main fuel storage tank (53) from a fuel tank truck, the fuel that is filtered. By simplifying the system arrangement, the conveying and recycling functions of the fuel are achieved, and the fuel in the main fuel storage tank is heated to ensure safe and stable operation of the diesel engine.
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