Multi-point stove slot is one of Changsha Metallurgy Design and Research Institute introduced by Sumitomo Corporation of Japan and digested transplantation and the introduction of energy-saving stove points. The multi-slot burner is a diffusion type two-stage combustion type, which is composed of a plurality of small burners arranged in a dense arrangement, and the discharge ports of the burners are mutually penetrated to form a narrow trapezoidal common combustion passage, which is sprayed from each small nozzle. The strong swirling primary mixed gas, through the extrusion of the narrow channel, and the enveloping effect of the curtain-like secondary air ejected at high speed on both sides of the channel, after leaving the combustion channel, a homogeneous continuous jet is formed. After burning, it becomes a trapezoidal flame wall. The width of the flame wall is 200-300mm. The schematic diagram of the multi-slot burner is shown in Figure 2. (two) performance characteristics A ball bearing is a type of Rolling-Element Bearing that uses balls to maintain the separation between the bearing races. Ball Bearings Ball Bearings,Precision Ball Bearings,Stainless Steel Ball Bearing,Non-Standard Ball Bearing Ningbo Ritbearing Imp & Exp Co.,Ltd. , http://www.ritbearingchina.com
(I) Structure Introduction The multi-slot ignition furnace consists of an ignition section and a heat preservation section. In the ignition section, a multi-slot burner is mounted on the top of the furnace in a line-like manner, and the trapezoidal flame wall fuel produced by the combustion of the multi-slot burner is used. surface. The heat preservation section can not only slowly cool the surface of the sinter layer, but also supply the air required for the combustion of the coke powder in the layer. The middle partition wall separates the two sections of the temperature and pressure regime. Sometimes, in order to prevent the low temperature zone on both sides of the trolley, the ignition is not uniform. On the top of the furnace on both sides of the multi-slot burner, the side burner is arranged to strengthen the ignition on both sides, as shown in Figure 1. 
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The performance characteristics are as follows:
(1) The advanced technology of forming the direct flame of the strip flame by using the multi-slot burner, the flame zone in the width direction of the trolley is high in combustion temperature, the temperature field is very uniform, and the ignition mixture can be ignited in the case of avoiding waste of heat. The coke powder is evenly burned, so the ignition heat efficiency is high, the ignition quality is good, and the energy saving effect is remarkable.
(2) Multi-slot burners have good combustion characteristics.
1) The formed strip flame is uniform and stable, and the temperature difference along the width of the trolley is less than 50 °C.
2) Adjustment ratio up to 1:3
3) The flame length is short, and the flame length can be adjusted by changing the ratio of primary and secondary air in the range of 250 to 750 mm.
4) air-fuel ratio can vary widely, the excess air ratio may be greater than 2.5, the content of NO x in the exhaust gas is less than 5 × 10 - 6%.
5) It is not easy to get rid of fire and temper.
6) The burner nozzle is made of heat-resistant steel, and the secondary air sprayed at high speed can protect the burner and have a long service life.
(3) Since the multi-slot burner flame is very short, the height of the furnace can be greatly reduced, the improvement of the heat transfer effect in the furnace shortens the ignition time of the coke powder, and the effective length of the furnace can also be reduced, so that the furnace volume of the ignition furnace is small and the weight is small. Light, easy to construct and easy to replace.
(4) Long service life, safe and reliable operation, convenient operation and maintenance, and good working conditions.
(III) Use effect Since the first use of multi-slot ignition furnace for WISCO No.3 No.3 machine in December 1989, it has been widely promoted in various large-scale sintering machines in China, with remarkable energy-saving effect and long life of burner. Good economic benefits. Let's take the No. 3 machine as an example to introduce its energy saving effect.
3 the effective area of the machine 2, the carriage width 82.5m 2.5m, thickness of material 400 ~ 500mm, vehicle speed 1.9 ~ 2.1m / min, a mixed gas of coal calorific 8.4 ~ 10.5MJ / m 3, the yield sintering machine 124 ~130t/(h•å°), the volume of the ignition furnace before the transformation is 18.83m 3 , the quality is about 52t/set; the volume after transformation is 2.43m 3 , and the quality is about 12t. After the transformation, the ignition temperature is 1050～1100°C, the ignition time is 45s, and the moisture content of the mixture is about 6%. The test results show that the temperature difference of the flame zone is t m ax=51°C, the temperature difference of the material surface is t m ax=79°C, and the ignition gas consumption is Before the transformation, the 0.139GJ/t was reduced to 0.063GJ/t, the ignition energy consumption was reduced by 54.7%, and the annual output of the sintering machine was about 895.35 million t/a. According to the 1990 WISCO gas unit price of 3.8 yuan/GJ, only one gas band was saved. The economic benefits come up to 258,600 yuan / a.
The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. It achieves this by using at least three races to contain the balls and transmit the loads through the balls. In most applications, one race is stationary and the other is attached to the rotating assembly (e.g., a hub or shaft). As one of the bearing races rotates it causes the balls to rotate as well. Because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other.
Ball Bearings tend to have lower load capacity for their size than other kinds of rolling-element bearings due to the smaller contact area between the balls and races. However, they can tolerate some misalignment of the inner and outer races.