JP2002317623A - Black smoke removing system for diesel-powered vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that with a conventional method which purifies an exhaust gas of a diesel vehicle by having it pass through water or an alkaline solution, the liquid should be replenished during use since the water is evaporated by the high temperature exhaust gas, that it is troublesome to replenish the liquid with a truck mixer agitator and that the liquid for replenishment should be ready all the time. SOLUTION: Fig. 1 shows a conventional exhaust emission control device, and an example which the present invention is applied to this will be described. An exhaust gas from a diesel vehicle is guided from an introduction port 5 through a hose 8 to a purifying liquid 9 in a tank 1. As the present invention removes black smoke in the exhaust gas using glycerin, propylene glycol solution or the like with high boiling point as the purifying liquid, the liquid is not exhausted even after having passed the high-temperature exhaust gas, and it is not necessary to replenish the liquid during use. Thus, there is no need to prepare the replenishment liquid all the time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing black smoke in exhaust gas emitted from a diesel vehicle.

[0002]

2. Description of the Related Art FIG. 1 shows an example of a conventional exhaust gas purifying apparatus for a diesel vehicle, and FIG. 2 shows an example in which such an exhaust gas purifying apparatus is mounted on a mixer truck. is there. An exhaust gas inlet 5 provided in the tank 1 of the exhaust gas purification device is connected to a muffler of a car via a hose 8, and an alkaline aqueous solution 9 is injected into the tank 1. When the mixer is activated during operation, exhaust gas is emitted from the engine, and the exhaust gas is exhausted by a muffler,
The gas is injected into the alkaline aqueous solution from the exhaust gas inlet 5 through the hose 8 through a pipe in the tank. The alkaline aqueous solution 9 captures and removes harmful substances such as black smoke contained in the exhaust gas to purify the exhaust gas, and releases the purified gas from the outlet 3 to the atmosphere. Although the movement path of the exhaust gas in the tank 1 is shown only schematically in FIG. 1, the alkaline aqueous solution and the harmful components in the exhaust gas are sufficiently mixed and come into contact with each other over a long section, so that the harmful substances can be efficiently discharged. A partition wall, a guide plate, and the like forming a flow path are provided so as to be captured therein.

[0003]

In a conventional exhaust gas purifying apparatus for a diesel vehicle, water or an alkaline aqueous solution, for example, a 2% aqueous sodium carbonate solution is used to remove harmful substances. In the case of an alkaline aqueous solution, when exhaust gas heated to a temperature of 160 ° C. or higher is injected into the aqueous solution, the aqueous solution takes away the heat and acts to cool the exhaust gas. Evaporates. Even if 100 liters of an alkaline aqueous solution is previously injected into the tank, 10 liters are consumed per hour. For this reason, the water level 10 of the alkaline aqueous solution 9 in the tank 1 is observed through the inspection window 6 as shown in FIG. 1, and when the water level drops to a predetermined position, a new aqueous solution must be replenished from the inlet 2. When the work on site is performed for a long time, replenishment of the alkaline aqueous solution is a complicated operation, and the alkaline aqueous solution for replenishment must always be provided.

[0004]

According to the present invention, a polyhydric alcohol solution such as glycerin is used instead of water or an aqueous alkali solution, so that replenishment of the solution is omitted and a spare solution is always prepared. It is not necessary to keep it.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A case where the method of the present invention using glycerin is applied to the apparatus shown in FIG. 1 will be described. A glycerin solution is injected into the tank 1 instead of the alkaline aqueous solution. When the engine operates, the exhaust gas enters the tank 1 through the hose 8 and is injected into the glycerin liquid. Glycerin is more viscous than water or the like, but does not hinder the passage of high-temperature exhaust gas. The black smoke component in the exhaust gas emitted from the diesel engine is mainly composed of carbon generated by incomplete combustion of the fuel. Removed. The engine displacement is 18,000
cc mixer truck, 6,800cc dump truck, same
A 3,600 cc aerial work vehicle was selected, and the exhaust gas before and after the passage of the glycerin solution was investigated using a filter paper. The results were as follows. In addition, the black smoke density referred to in the following table is a value obtained by measuring the degree of blackening from the reflectance when light is applied to filter paper according to JIS standards, and indicates an average value of the measurement results obtained a plurality of times.

[Table 1] As shown in the above example, after passing through glycerin, the black smoke concentration of all vehicles was 0%, that is, the black smoke removal rate of 100% was able to be achieved. Moreover, since the boiling point of glycerin is as high as 290 ° C., there is no consumption of the liquid, and there is no need to replenish the liquid while performing the operation. Since the liquid is not consumed in this way, it is possible to reduce the size of the apparatus without having to inject an extra liquid in advance in anticipation of evaporation as in the case of using an alkaline aqueous solution. Also, there is no need to always prepare a replenisher. If the liquid is continuously used, the liquid becomes dirty. Therefore, the liquid is replaced approximately once a month as a guide. However, strictly, the liquid is changed depending on the use state. Glycerin is currently
Many of them are made with components extracted from coconut berries, and they are also excellent in using environmentally friendly vegetable oils. Above, the example of using glycerin among the polyhydric alcohols was described in particular. When used, the same effect as glycerin can be achieved. The present invention is characterized in that a polyhydric alcohol such as glycerin is used as a liquid for purifying exhaust gas.
The present invention can be applied not only to the above-described purifying apparatus but also to various apparatuses for purifying exhaust gas of a diesel engine into a tank and passing the purifying liquid through the purifying liquid. In addition, the usage mode, when working by operating the engine with the diesel vehicle stopped,
It can be used not only for the purpose of protecting the health of workers, but also for removing black smoke emitted from a long-running diesel car.

[0006]

According to the present invention, it is possible to efficiently remove black smoke in exhaust gas of a diesel vehicle, to eliminate the need for replenishing the liquid during work, and to always prepare a replenisher during work. Nor. For this reason, it has a remarkable effect that it can be applied not only to the case where the vehicle is stopped and working, but also to the running vehicle and to remove black smoke emitted during traveling, greatly contributing to pollution prevention. can do.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a conventional exhaust gas purifying apparatus for a diesel vehicle.

FIG. 2 is a diagram showing an example in which the purification device of FIG. 1 is mounted on a mixer truck.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 2 Inlet 3 Outlet 4 Handle 5 Exhaust gas inlet 6 Inspection window 7 Drain port 8 Hose 9 Alkaline aqueous solution 10 Level of alkaline aqueous solution

Claims (2)

[Claims] An exhaust gas discharged from a diesel engine is introduced into a polyhydric alcohol liquid in a tank and passes through the liquid to remove black smoke in the exhaust gas. . 2. The method according to claim 1, wherein a glycerin liquid is used as the polyhydric alcohol liquid.