Low-entropy mixed-fuel engine

Abstract

The invention discloses a low-entropy mixed-fuel engine which comprises an air cylinder, an air cylinder cover, a piston, a working medium storage box, an exhaust passage and a combustion chamber. A high-pressure fluid channel is arranged inside or outside of a side wall of the air cylinder and inside or outside of the air cylinder cover; the bearing capability of the high-pressure fluid channel is more than or equal to 1MPa; the low-entropy mixed-fuel engine also comprises an exhaust heat exchanger, wherein the exhaust passage is communicated with an inlet of a heating fluid of the exhaust heat exchanger; an outlet of the high-pressure fluid channel is communicated with a steam ejector through an ejection control valve; the steam ejector is communicated with the combustion chamber, and the ejection control valve is set to be a correct-time control valve; or an outlet of the high-pressure fluid channel is communicated with an inlet of a working medium of a heat engine, and the working medium of the high-temperature high-pressure fluid generated in the high-pressure fluid channel pushes the heat engine to apply work. Because the low-entropy mixed-fuel engine effectively utilizes the afterheat of the engine, the heat-power conversion efficiency of the engine is improved with energy-saving and environment protection.

Description

technical field [0001] The invention relates to the field of engines, in particular to a low-entropy co-combustion engine. technical background [0002] As we all know, the heat discharged by the traditional engine through the cooling system and the exhaust system accounts for about two-thirds of the fuel energy of the engine, and the engine cooling system and the exhaust system each account for about half, that is to say, the heat emitted by the engine cooling system accounts for about 2 / 3 of the fuel energy. one-third of. The utilization of engine waste heat has long been the focus of improving engine efficiency. However, due to the structural characteristics of traditional engines, the pressure bearing capacity of the cooling medium passages in the cooling system, especially the cylinder liners, cylinder heads and other components, is generally less than 0.3MPa. Under this pressure bearing capacity, the cooling water in the cooling medium passages It is difficult to dir...

AI Technical Summary

Problems solved by technology

Although similar attempts have been made in the past about the so-called mixed-combustion engine, such as the international patent WO99 / 37904, there is no real significance. The reason is that the temperature of the cooling medium on the outer wall of the combustion chamber as mentioned above is low, and the heat grade is too low. In other words, due to the limitation of the structure of the existing internal combustion engine, the outer wall of the combustion chamber requires high cooling intensity, and the temperature of the cooling medium is low, resulting in a low grade of heat.

[0007] Although the invention patent I applied for with the application number 200810135005.X has been improved, but; first, it was limited to the structure of the existing engine at that time, and it was believed that the temperature of the cooling water in the cooling system was much lower than the temperature of the exhaust gas, so the external combustion The working medium of the internal combustion engine (that is, the cooling medium of the internal combustion engine) first passes through the pressure-bearing channel of the cylinder liner and the cylinder head to absorb heat and heat up or even vaporize, and then flows into the exhaust heat exchanger for further heat absorption, but the working medium of the external combustion engine (that is, the cooling medium of the internal combustion engine) this arrangement of flow direction is now considered to be inefficient and unreasonable; due to the improvement of the structure and materials of engine cylinders, pistons and other parts, especially due to the use of suspended pistons, in controlling external combustion On the premise that the flow rate of the working medium of the internal combustion engine (that is, the cooling medium of the internal combustion engine) improves its thermal quality, the temperature of the working medium of the external combustion engine (that is, the cooling medium of the internal combustion engine) can be close to or even exceed the temperature of the exhaust gas of the internal combustion engine before entering the atmosphere. When the temperature of the working fluid of the external combustion engine is already high, it absorbs little or no heat after passing through the exhaust heat exchanger, resulting in a high temperature of the exhaust gas of the internal combustion engine before entering the atmosphere, and the energy utilization rate is low. Low; if the working fluid of the lower temperature external combustion engine (that is, the cooling medium of the internal combustion engine) can first pass through the exhaust heat exchanger to absorb the heat of the exhaust gas, the temperature of the exhaust gas of the internal combustion engine can be greatly reduced before entering the atmosphere , so as to improve the recovery and utilization rate of energy, the working fluid of the external combustion engine after absorbing heat in the exhaust heat exchanger flows into the cylinder liner and the working medium pressure passage on the cylinder head for further heat absorption, thereby avoiding waste heat as much as possible Low quality in the production process, high-efficiency and high-quality recovery of waste heat, and improvement of energy recovery and utilization; second, due to the limitation of the traditional structure of the existing engine (such as the piston between the upper and lower dead centers and the cylinder liner need sliding seal lubrication , so that the temperature of the cylinder liner cannot be too high, it must be cooled with high intensity), in order to meet the cooling requirements of the cylinder liner, the working medium of the external combustion engine (that is, the cooling medium of the internal combustion engine) must have a large flow rate but low quality (low temperature and low pressure), external combustion It is very difficult to convert the thermal energy of the working fluid of the engine into mechanical work, and it is difficult to effectively recycle; third, due to the limitation of the conventional materials and structures in the existing engine manufacturing, although the pressure-bearing channel of the working medium has certain pressure resistance and is not Not high (only about three atmospheres), although the working fluid is allowed to gasify in it, the pressure should not be too high, which also makes the working fluid of the external combustion engine low in thermal quality (low temperature and low pressure), and the heat energy of the working fluid of the external combustion engine It is very difficult to convert into mechanical work, and it is difficult to effectively recycle

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