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KR-20260063858-A - Engine system and Control method thereof

KR20260063858AKR 20260063858 AKR20260063858 AKR 20260063858AKR-20260063858-A

Abstract

An engine system according to the present invention comprises: a supercharger that compresses air supplied to an engine; an air chamber that receives compressed air from the supercharger and supplies the compressed air to the engine; an oxygen generating unit that generates oxygen to supply oxygen to the air chamber; a buffer tank that temporarily stores the oxygen generated by the oxygen generating unit; a compressor that receives oxygen from the buffer tank, compresses it, and supplies the compressed oxygen to the air chamber; and a control unit that controls the amount of oxygen supplied to the air chamber. The control unit can control the amount of oxygen supplied according to at least one of the type of fuel supplied to the engine, the output of the engine, the engine operating conditions of the engine, the concentration of nitrous oxide contained in the exhaust gas of the engine, and the concentration of unburned fuel contained in the exhaust gas.

Inventors

  • 김희경
  • 서재엽

Assignees

  • 에이치디한국조선해양 주식회사

Dates

Publication Date
20260507
Application Date
20241031

Claims (7)

  1. A supercharger that compresses air supplied to the engine; An air chamber that receives compressed air from the supercharger and supplies the compressed air to the engine; An oxygen generating unit that generates oxygen to supply oxygen to the above air chamber; A buffer tank for temporarily storing oxygen generated in the above oxygen generation unit; A compressor that receives oxygen from the buffer tank, compresses it, and supplies the compressed oxygen to the air chamber; and It includes a control unit that regulates the amount of oxygen supplied to the air chamber, and The above control unit is an engine system that adjusts the oxygen supply amount according to at least one of the type of fuel supplied to the engine, the output of the engine, the engine operating conditions of the engine, the concentration of nitrous oxide contained in the exhaust gas of the engine, and the concentration of unburned fuel contained in the exhaust gas.
  2. In claim 1, The above engine is provided as a dual-fuel engine that selectively receives a main fuel which is one or more of LNG, ammonia, LPG, methanol, ethanol, and hydrogen, and a sub fuel which is either marine fuel or biofuel. The above control unit is an engine system that increases the oxygen supply amount when the fuel supplied to the engine is either LNG or ammonia, or is an LNG-ammonia mixed fuel in which LNG and ammonia are mixed.
  3. In claim 1, The above control unit is an engine system that increases the oxygen supply amount in a low-output state where the output of the engine is 50% or less.
  4. In claim 1, The above control unit is an engine system that increases the oxygen supply amount when the concentration of nitrous oxide contained in the exhaust gas is greater than or equal to the nitrous oxide reference concentration value or when the concentration of unburned fuel contained in the exhaust gas is greater than or equal to the unburned fuel reference concentration value.
  5. In claim 1, The above engine operating conditions are any one of the cylinder pressure deviation of the engine, the temperature of the air, the humidity of the air, the density of the air, the amount of air, the temperature of the fuel, and the rotational speed of the supercharger, in an engine system.
  6. A method for controlling an engine system according to any one of claims 1 to 5, A step for determining the type of fuel supplied to the engine; If the fuel is any one of LPG, methanol, ethanol, hydrogen, or a mixture of two or more of these, or is marine fuel or biofuel, the step of measuring the output of the engine; and When the output of the above engine exceeds a reference output value, the method includes a step of determining whether a decrease in output occurs due to the engine operating conditions of the above engine. A control method for increasing the amount of oxygen supplied to the engine when the output of the engine is below a reference output value or when it is determined that a decrease in output has occurred due to the engine operating conditions of the engine.
  7. In claim 6, If the fuel is either LNG or ammonia, or is an LNG-ammonia mixed fuel in which LNG and ammonia are mixed, the method further includes a step of determining at least one of the concentration of nitrous oxide contained in the exhaust gas of the engine, the concentration of unburned fuel contained in the exhaust gas, and whether a decrease in output occurs due to the engine operating conditions of the engine. A control method for increasing the oxygen supply amount when the concentration of nitrous oxide contained in the exhaust gas is greater than or equal to the nitrous oxide standard concentration value, or when the concentration of unburned fuel contained in the exhaust gas is greater than or equal to the unburned fuel standard concentration value, or when it is determined that a decrease in output has occurred due to the engine operating conditions of the engine.

Description

Engine system and control method thereof The present invention relates to an engine system and a method for controlling the same. Generally, various engines installed on ships generate power by burning fossil fuels such as diesel fuel, and the exhaust gases produced during this combustion process contain nitrogen oxides, sulfur oxides, carbon dioxide, and other pollutants. Recently, in accordance with the strengthening of IMO environmental regulations, emission limits are being regulated to reduce the release of these environmental pollutants. Therefore, in the case of engines, environmental regulations are being met by installing Selective Catalytic Reduction (SCR) systems, scrubbers, or Diesel Particulate Filters (DPF) to remove nitrogen oxides and other pollutants. However, conventional engine systems as described above can only subsequently remove environmental pollutants from exhaust gases generated after combustion, and cannot fundamentally reduce the generation of environmental pollutants themselves by improving engine combustion efficiency. Furthermore, these conventional engine systems not only struggle to take proactive measures to reduce the generation of environmental pollutants in response to sudden engine load fluctuations or operating conditions, but also suffer from the problem of incurring high maintenance costs for equipment required to remove pollutants contained in exhaust gases. Accordingly, there is a demand for an engine system capable of actively responding to sudden engine load fluctuations or engine operating conditions to reduce the emission of environmental pollutants. FIG. 1 is a drawing of an engine system according to the present invention. FIG. 2 is a diagram illustrating an example of a control method for an engine system according to the present invention. Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by these terms. Where it is stated that a component is "connected," "combined," or "joined" to another component, it should be understood that the component may be directly connected or joined to the other component, but that another component may also be "connected," "combined," or "joined" between each component. In this specification, the front-back, left-right, and up-down directions are referred to for convenience of explanation and may be directions orthogonal to one another. However, these directions are determined relatively, and the term "up-down direction" does not necessarily mean a vertical direction. The engine system (1) according to the present invention aims to provide a system that can improve the efficiency of the engine (100) and reduce environmental pollutants such as nitrous oxide and unburned fuel emitted from the exhaust gas of the engine (100) by additionally supplying oxygen to the air supplied to the engine (100) and supplying air with a relatively high oxygen concentration to the engine (100). Hereinafter, an engine system (1) according to the present invention will be described with reference to FIG. 1. FIG. 1 is a drawing of an engine system (1) according to the present invention. Referring to FIG. 1, the engine system (1) according to the present invention comprises a supercharger (210) that compresses air supplied to an engine (100), an air chamber (220) that receives compressed air from the supercharger (210) and supplies the compressed air to the engine (100), an oxygen generating unit (310) that generates oxygen to supply oxygen to the air chamber (220), a buffer tank (320) that temporarily stores the oxygen generated from the oxygen generating unit (310), a compressor (330) that receives oxygen from the buffer tank (320), compresses it, and supplies the compressed oxygen to the air chamber (220), and a control unit (not shown) that controls the amount of oxygen supplied to the air chamber (220). At this time, the control unit can adjust the amount of oxygen supplied according to at least one of the type of fuel supplied to the engine (100), the output of the engine (100), the engine operating conditions of the engine (100), the concentration of nitrous oxide contained in the exhaust gas of the eng