CN-122014468-A - Single-stage heavy oil supply system and method for marine diesel engine

CN122014468ACN 122014468 ACN122014468 ACN 122014468ACN-122014468-A

Abstract

The invention discloses a marine diesel engine single-stage heavy oil supply system and a method thereof, belonging to the technical field of ships. The system comprises a heavy oil daily cabinet, a fuel supply pump, an atomization heater, a fuel filter, a diesel engine, a buffer cabinet and a bypass pressure regulating valve, wherein the heavy oil daily cabinet is sequentially connected with the fuel supply pump, the atomization heater and the fuel filter through an oil supply pipeline, the oil supply pipeline is divided into an oil supply branch and a pressure regulating branch after passing through the fuel filter, the oil supply branch is connected to the diesel engine, the bypass pressure regulating valve is arranged on the pressure regulating branch, an outlet of the diesel engine and an outlet of the bypass pressure regulating valve are both connected to the buffer cabinet, the outlet of the buffer cabinet is connected to an inlet of the fuel supply pump through an oil return pipeline, the oil return pipeline is provided with a first back pressure valve, the flow of the fuel supply pump is larger than the fuel consumption of the diesel engine, and the oil pressure of the outlet of the fuel supply pump is higher than the set pressure of the bypass pressure regulating valve. The invention has the advantages of simplifying the power equipment of the system, ensuring the stable oil supply of the diesel engine, reducing the cost and being convenient for maintenance.

Inventors

LI WENFENG
JIANG WEIDONG
ZHU XIAOQIANG

Assignees

扬州中远海运重工有限公司

Dates

Publication Date: 20260512
Application Date: 20260330

Claims (10)

1. The marine diesel engine single-stage heavy oil supply system comprises a heavy oil daily cabinet, a fuel oil supply pump, an atomization heater, a fuel oil filter and a diesel engine, and is characterized by further comprising a buffer cabinet and a bypass pressure regulating valve, wherein the heavy oil daily cabinet is sequentially connected with the fuel oil supply pump, the atomization heater and the fuel oil filter through a fuel oil supply pipeline, the fuel oil supply pipeline is divided into a fuel oil supply branch and a pressure regulating branch after passing through the fuel oil filter, the fuel oil supply branch is connected to the diesel engine, the pressure regulating branch is provided with the bypass pressure regulating valve, an outlet of the diesel engine and an outlet of the bypass pressure regulating valve are both connected to the buffer cabinet, the outlet of the buffer cabinet is connected to an inlet of the fuel oil supply pump through an oil return pipeline, the oil return pipeline is provided with a first back pressure valve, the flow of the fuel oil supply pump is larger than the fuel consumption of the diesel engine, and the outlet oil pressure of the fuel oil supply pump is higher than the set pressure of the bypass pressure regulating valve.
2. The marine diesel single-stage heavy oil supply system according to claim 1, wherein the buffer tank is provided with an exhaust port and a safety pressure relief port, the exhaust port is provided with an exhaust passage, the exhaust passage is provided with an exhaust electromagnetic valve, the safety pressure relief port is provided with a pressure relief passage, the pressure relief passage is provided with a safety valve, the exhaust passage and the pressure relief passage are converged and then connected to the heavy oil daily tank through a main pipeline, and the main pipeline is provided with a second back pressure valve.
3. The marine diesel single-stage heavy oil supply system according to claim 2, wherein the buffer tank is provided with a liquid level switch, and the liquid level switch is in signal connection with the exhaust electromagnetic valve and is used for controlling the opening and closing of the exhaust electromagnetic valve according to the liquid level state in the buffer tank.
4. The marine diesel single-stage heavy oil supply system according to claim 1, wherein an air chamber for pressure buffering is reserved in an upper portion of the buffer tank.
5. The marine diesel single-stage heavy oil supply system according to claim 4, wherein the volume of the air chamber is one fourth of the total volume of the buffer tank.
6. The marine diesel single-stage heavy oil supply system according to claim 1, wherein a viscosity controller is provided in an oil supply line between the atomizing heater and the fuel filter.
7. The marine diesel single-stage heavy oil supply system according to claim 1, wherein the flow rate of the fuel supply pump is 3 to 5 times the fuel consumption of the diesel engine.
8. A marine diesel single-stage heavy oil supply method, characterized by employing a marine diesel single-stage heavy oil supply system according to any one of claims 1 to 7, comprising the steps of: (1) Starting a fuel supply pump to pressurize fuel in the heavy oil daily cabinet, wherein the flow of the fuel supply pump is larger than the fuel consumption of the diesel engine; (2) Fuel oil treatment, namely heating the pressurized heavy oil by an atomization heater and filtering by a fuel oil filter; (3) The fuel oil filtered by the fuel oil filter is divided into two paths, wherein one path is supplied to the diesel engine for combustion consumption through an oil supply branch, and unconsumed fuel oil flows to the buffer cabinet; (4) And buffering and circulating, namely when the pressure in the buffer cabinet is higher than the set pressure of the first back pressure valve, the first back pressure valve is opened, and the fuel in the buffer cabinet returns to the inlet of the fuel supply pump through the oil return channel to form circulation.
9. The method for supplying single-stage heavy oil to a marine diesel engine according to claim 8, further comprising a step of discharging the gas in linkage with the liquid level of the buffer tank by controlling the gas discharge solenoid valve to be opened when the liquid level of the liquid level switch is lower than a preset position so that the gas accumulated in the buffer tank enters the main pipeline, and opening the second back pressure valve to discharge the gas to the heavy oil daily tank when the pressure in the main pipeline is accumulated to reach the set pressure of the second back pressure valve.
10. The method for supplying single-stage heavy oil to a marine diesel engine according to claim 8, further comprising the step of safely releasing the overpressure in the buffer tank by opening the safety valve when the pressure in the buffer tank exceeds the set pressure of the safety valve, and releasing the overpressure oil-gas medium in the buffer tank to the heavy oil daily tank.

Description

Single-stage heavy oil supply system and method for marine diesel engine Technical Field The invention relates to the technical field of ships, in particular to a marine diesel engine single-stage heavy oil supply system and a marine diesel engine single-stage heavy oil supply method. Background The heavy oil supply system of the marine diesel engine is important for guaranteeing the stable operation of the host. At present, the existing ship heavy oil supply system generally adopts an oil supply mode of a two-stage pump, namely, a fuel oil supply pump firstly absorbs oil from a daily oil tank and initially pressurizes the oil, and then a special fuel oil circulating pump is still needed for repressurization, so that the working pressure required by a diesel engine can be achieved. The traditional mode is required to be provided with two sets of power equipment of a supply pump and a circulating pump, and a corresponding control box, valve members, pipelines and the like, so that the system is relatively complex, high in cost and high in maintenance workload. Disclosure of Invention The invention aims at overcoming the defects of the prior art, and provides a marine diesel engine single-stage heavy oil supply system and a marine diesel engine single-stage heavy oil supply method. In order to achieve the purpose of the invention, the marine diesel engine single-stage heavy oil supply system and the method adopt the following technical scheme: the marine diesel engine single-stage heavy oil supply system comprises a heavy oil daily cabinet, a fuel oil supply pump, an atomization heater, a fuel oil filter, a diesel engine, a buffer cabinet and a bypass pressure regulating valve, wherein the heavy oil daily cabinet is sequentially connected with the fuel oil supply pump, the atomization heater and the fuel oil filter through a fuel oil supply pipeline, the fuel oil supply pipeline is divided into a fuel oil supply branch and a pressure regulating branch after passing through the fuel oil filter, the fuel oil supply branch is connected to the diesel engine, the bypass pressure regulating valve is arranged on the pressure regulating branch, an outlet of the diesel engine and an outlet of the bypass pressure regulating valve are both connected to the buffer cabinet, an outlet of the buffer cabinet is connected to an inlet of the fuel oil supply pump through an oil return pipeline, the oil return pipeline is provided with a first back pressure valve, the flow of the fuel oil supply pump is larger than the fuel consumption of the diesel engine, and the outlet fuel oil pressure of the fuel oil supply pump is higher than the set pressure of the bypass pressure regulating valve. The buffer cabinet is preferably provided with an exhaust port and a safety pressure relief port, the exhaust port is provided with an exhaust path, an exhaust electromagnetic valve is arranged on the exhaust path, the safety pressure relief port is provided with a pressure relief path, the pressure relief path is provided with a safety valve, the exhaust path and the pressure relief path are converged and then connected to the heavy oil daily cabinet through a main pipeline, and the main pipeline is provided with a second back pressure valve. The invention integrates the functions of exhaust and overpressure protection, so that the system can automatically exhaust gas and prevent overpressure, and the safety and stability of the system are improved. Preferably, the buffer cabinet is provided with a liquid level switch, and the liquid level switch is connected with the exhaust electromagnetic valve in a signal manner and is used for controlling the opening and closing of the exhaust electromagnetic valve according to the liquid level state in the buffer cabinet. Preferably, the upper part of the buffer cabinet is reserved with an air cavity for pressure buffer. Preferably, the volume of the air cavity occupies one fourth of the total volume of the buffer cabinet. Preferably, a viscosity controller is provided in the fuel supply line between the atomizing heater and the fuel filter. Preferably, the flow rate of the fuel supply pump is 3-5 times of the fuel consumption of the diesel engine. The flow rate of the fuel supply pump is 3-5 times of the fuel consumption of the diesel engine, so that sufficient fuel is ensured to participate in circulation. A marine diesel single stage heavy oil supply method comprising the steps of: (1) Starting a fuel supply pump to pressurize fuel in the heavy oil daily cabinet, wherein the flow of the fuel supply pump is larger than the fuel consumption of the diesel engine; (2) Fuel oil treatment, namely heating the pressurized heavy oil by an atomization heater and filtering by a fuel oil filter; (3) The fuel oil filtered by the fuel oil filter is divided into two paths, wherein one path is supplied to the diesel engine for combustion consumption through an oil supply branch, and unconsumed fuel oil flows to the b