Mixed dimethyl ether fuel
A technology of mixing fuel and dimethyl ether, which is applied in the direction of fuel, gas fuel, petroleum industry, etc., can solve the problems of easy knocking, unsatisfactory practical application, low calorific value of dimethyl ether, etc., and achieve the goal of improving anti-knock performance Effect
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Embodiment 1
[0018] No. 2 mixed fuel in the present embodiment and the following examples is a kind of dimethyl ether mixed fuel of the present invention, wherein said dimethyl ether accounts for 25% by weight of the mixed fuel, and trimethphene phosphate accounts for 25% of the mixed fuel. The weight percent is 5%, the bis-enylbutadiimine accounts for 3% by weight of the mixed fuel, and the liquefied petroleum gas accounts for 67% by weight of the mixed fuel.
[0019] Adopt routine method to detect as shown in table 2 (1 is No. 90 gasoline, 2 is mixed fuel);
[0020] Fuel type
1
2
Octane number RON
90
95
Theoretical air volume / kg kg -1
14.80
13.69
Theoretical lower calorific value / kJ kg -1
44500
40830
Theoretical calorific value of the mixture
/ KJ.kmol -1
84006
82612
[0021] It can be seen from Table 2 that the octane number of dimethyl ether, trimethylphene phosphate, bis-enylbutanediimin...
Embodiment 2
[0024] model
[0025] Converting the engine to a dual-fuel engine such as figure 1 As shown, it is only necessary to add a set of mixed fuel supply system under the condition that the basic structure of the original machine remains unchanged. The dimethyl ether-liquefied petroleum gas mixed fuel supply system is adjusted by the mixed fuel gas storage tank 1, pressure regulator 2, and Valve, solenoid valve, throat mixer and other components. After the mixed fuel is pressurized, it is stored in the gas storage tank in liquid form. When it is used, the heat of the cooling water in the liquid form of the mixed fuel is forcibly heated and turned into gas. The throat mixer is installed on the upper end of the carburetor, and the dimethyl ether-liquefied petroleum gas mixed fuel is sucked out from the pressure regulator by the vacuum of the throat, mixed with air evenly, and then enters the cylinder.
Embodiment 3
[0027] Analysis of the combustion process in the cylinder:
[0028] 3.1 Comparison of mixed fuel and gasoline dynamometer diagram
[0029] Because the gas intake process, mixture formation process, ignition process and combustion process of the gasoline engine are quite complicated, the change of the in-cylinder pressure reflected by these processes is also very complicated. Even if the engine works stably, the measured cycle The pressure data and dynamometer diagram of the engine are also not representative, so it is difficult to make an objective evaluation and diagnosis of the working process of the engine and the performance of the whole machine. In this paper, 150 cycles are taken when measuring and recording the dynamometer diagram, and then these 150 cycles are averaged after removing abnormal points, and finally one is averaged, and finally an average dynamometer diagram is obtained, so The dynamometer diagram of is more representative.
[0030] figure 2 and imag...
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Abstract
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