Energy control method of exhaust gas boiler based on exhaust gas bypass device of diesel engine

Abstract

Disclosed is an exhaust gas boiler energy control method based on an exhaust gas bypass device of a diesel engine. The exhaust gas bypass device is additionally arranged between an exhaust header of the diesel engine and an exhaust gas boiler, and comprises an exhaust gas bypass valve, a flow closure pore plate, a PID control unit and an exhaust gas bypass control unit. The exhaust header passes through the exhaust gas bypass valve and the flow closure pore plate in sequence and is connected with the exhaust gas boiler, the PID control unit is connected with a steam pressure sensor and the exhaust gas bypass control unit, and the exhaust gas bypass control unit is connected with the exhaust gas bypass valve. The PID control unit and the exhaust gas bypass control unit automatically controlthe exhaust gas bypass valve to adjust and compensate for the quantity of exhaust gas obtained by the exhaust gas boiler within a certain diesel engine load range in the mode of using the steam pressure outputted by the exhaust gas boiler as a control parameter, and opening of a steam discharge valve of the diesel engine or an oil burning boiler is avoided, or the opening time of the steam discharge valve of the diesel engine or the oil burning boiler is shortened. The exhaust gas boiler energy control method based on the exhaust gas bypass device of the diesel engine achieves the effects ofreducing the oil consumption of ships and improving the running efficiency, and has the advantages of being high in degree of automation, easy and convenient to operate and high in economy.

Description

technical field [0001] The invention relates to a marine diesel engine system, in particular to an energy control method for an exhaust gas boiler based on an exhaust gas bypass device of a diesel engine, and belongs to the technical field of diesel engines. Background technique [0002] During the daily operation of the ship, a large amount of steam is needed for fuel heating, tank heating and cleaning, and fire extinguishing. Generally, ships use the exhaust gas discharged from the supercharger of a diesel engine as a heat source, and obtain steam by heating fresh water through an exhaust gas boiler. When the amount of exhaust gas provided by the diesel engine is insufficient, it is necessary to start an additional oil-fired boiler to heat fresh water by burning fuel oil to supplement the amount of steam. However, the fuel consumption of the oil-fired boiler is very high and the economy is very poor. When the amount of exhaust gas provided by the diesel engine is too much...

AI Technical Summary

Problems solved by technology

However, long-term operation of the diesel engine under low-load and partial-load conditions will reduce the exhaust gas energy generated by the diesel engine. In order to ensure the supply of steam, the opening time of the oil-fired boiler will be longer, resulting in an increase in the operating cost of the ship.

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