Why do cars do tail gas processing? Let's slowly: First, why exhaust gas after treatment? We all know that after diesel combustion, particulates and exhaust gas are emitted. Apart from the water and carbon dioxide produced by diesel combustion, this exhaust gas also contains nitrogen oxides (expressed by Nox). This nitrogen oxide is a harmful gas and must be treated before it can be released to the atmosphere. in. Why is there a lot of nitrogen oxides? Because diesel engines are now engaged in turbocharged diesel engines. To make the diesel completely burn off, there must be enough oxygen to go inside, and the problem arises: too much oxygen will cause too much oxygen to burn and produce rich products. Nitrogen oxides. Second, how to deal with exhaust? Because the exhausted carbon particles (black smoke) will be burned in the catalyst inside the muffler. Nitrogen oxide gas treatment uses urea. This is not the urea of ​​the fertilizer, and the urea with a relatively high purity is prepared at a concentration of 32.5%. The tail gas treatment is very simple: urea is decomposed into ammonia gas by the waste heat of the exhaust pipe, and the ammonia gas reacts with nitrogen oxides to generate nitrogen gas and water. We have studied chemistry in junior high school. Nitrogen and water are harmless. Emissions to the atmosphere are worthy of our own conscience. Third, what conditions can deal with exhaust? 1, temperature: must be enough for a certain temperature, urea can decompose ammonia; also in order to react with nitrogen oxides. 2. Exhaust gas has excess nitrogen oxides. The probe (nitrogen oxide sensor) reports to the computer version. The on-board computer issues an order, and the urea pump only periodically and quantitatively injects urea. Therefore, the exhaust temperature sensor does not detect the urea is not more than 200 ° jet (so some "smart" drivers to remove or remove some of the temperature sensor, so that urea does not spray. Is it right, the following to say) 4. Is urea injection related to engine fuel consumption? In fact, urea is a post-treatment agent, independent of engine fuel consumption. However, why do some drivers run out of urea or deliberately do not use them? V. Drivers' Countermeasures for Urea: 1, brush computer version, will be the national four engine brush into the country three; 2. Remove the temperature sensor - let the computer sense that there is no heat in the exhaust pipe; remove the sensor some distance - so that the temperature can never reach 200 ° above, the computer does not command spray urea. 3. Dilution of urea: Dilute urea with pure water or fresh water to reduce the use of urea. 4, the urea nozzle back to the urea tank to circulate, do not allow urea to spray out. 5, to several sensors to be modified, "blind, deceived" computer version, so that its implementation of error messages, no longer instructed to spray urea. 6, simply remove the urea injection system Sixth, the above explanations 1, brush computer version, which is authorized by the host factory to do, this is achievable (estimated in the supervision department, competitors, under attack, in the future will not do). However, the fuel injection system of Guosi is different from that of Guosan, and the injection pressure is not the same. According to the designing country, the four engines should be lower than the national three engine oil consumption by 1-5%. Therefore, it is necessary to consider before the brush. Of course, those roadside shops that are self-taught are more aware of the issue. 2, the temperature sensor (some have two points before and after the temperature sensor, such as Tianlong, by the dragon, some only one, such as the liberation J6) remove or remove some distance, is that it can not spray urea. However, if the computer detects that the “long-term temperature of the exhaust pipe is lowâ€, it will display an error or fault symbol. After a certain time, the engine of the engine will limit the power (power) output. And how long does this "fault" occur? How long does it take for each engine manufacturer to design differently? A manufacturer is designed after 50 hours. What is the limit power? Also different from the manufacturer, a manufacturer is limited to 75% of the original machine, and even some are 50%. 3, urea dilution. If urea is diluted, the amount of urea it participates in the reaction is small, and the exhaust gas processed by the probe allows the probe to consistently detect excessive emissions. The computer has been instructing the urea pump to continuously increase the amount of injection, and of course it will be used much more. 4. When the urea tube is folded back, the computer can detect it and analyze it. Because the continuous discharge of unqualified computers detects emissions, and there is no change in temperature before and after, it is also considered to be a fault, and then the power is limited. 5. For “deception†computers, this must be achieved without modifying the computer version, reducing power consumption, increasing fuel consumption, and restoring the original status at any time to facilitate detection and annual review. It is necessary for the engine plant technicians to do this, not for ordinary people to achieve. , can achieve is a master. 6. Dismantling the urea system is not enough. After the computer detects the fault, it limits the power. Of course, heavy trucks generally consume about 0.1-0.17 yuan per kilometer of urea. I believe that drivers have this kind of mentality to "do not burn urea," especially thinking that the same roads, goods, and oil prices, the founding of the three cars is lower than the cost of the founding of the four cars, and the psychological balance is unbalanced. It is not necessarily their own to earn more, it is their own to spend. 7. Why did some drivers feel powerless after they had done it? Because the current car power is very large, 420/430 hp, reserve power is enough. If the power is not used on high speeds and plains, the power is limited due to the urea problem. 8. Why does fuel consumption rise after urea is not added? Because, when the engine power is limited, it is necessary to increase the throttle in advance before passing or climbing a hill. For example, if there is a slope in the first 2 km, you can usually go to the slope foot and add fuel to it. If the power is limited, you have to accelerate 2 km ahead of the slope. This 2 km section is an extra fuel consumption for a month. It will be found down without adding urea will increase fuel consumption than adding urea. Organic dyestuffs offers a wide array of colorants that can be utilized
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Vehicle urea you don't know about
What is car urea, you know?
The urea we know best is the fertilizer used in agriculture, but do you know that urea is used in medicine, food, and cosmetics? Urea is now also used in diesel vehicles, but instead of being "burned" inside a cylinder, it is "burned" in the exhaust pipe (muffler), that is, it is used for "after-treatment of automobile exhaust gas."