SU1004731A1 - Apparatus for cooling loose materials - Google Patents

Description

(5) DEVICE FOR COOLING BULK MATERIAL

The invention relates to the building materials industry, primarily to the field of cooling bulk materials, such as cement clinker in the cement industry. A device for cooling the bulk material after a rotary kiln is known, including a transition shaft divided by a vertical partition into large and small fractions chambers, grates and a hollow partition partitioner with blow nozzles at the eye level in a vertical partition LI 3. A disadvantage of the known device is The complexity of the design, since it essentially includes two separate coolers - the grate cooler for the large fraction and the fluidized bed cooler for the small fractions. The energy consumption for blowing into this device is high due to the need for individual high-pressure blowing for the fluidized bed chamber, additional consumption of energy-intensive compressed air for the classifier. In addition, the cooling of a large fraction of the material in the downstream when it falls from the furnace between the vertical end partition and the classifier is not effective due to the short residence time in this area. Closest to the invention to the technical essence and the achieved effect is a device for cooling hot materials, such as cement clinker, coming out directly from a rotary kiln, including a transition wall - forming a vertical shaft with the release of clinker from it through the gaps between the lower edge of the partition and the grate lattice. To adjust the height of the clinker layer, the partition wall is pivotal around the horizontal and onal axis, and an additional damper mounted on the reusable section of the town can move in the vertical direction 2J. With this design, the transverse size of the shaft and the height of the clinker layer are adjusted by changing the section angle of the shaft. only in the lower part, in the upper part, at the level of the horizontal axis of rotation and above, the section remains constant. This limits the ability to control the cooling mode in the most high-temperature zone and requires the installation of blowing devices with a margin on the pressure characteristics for the case of a material with fine grain size, Ie additional energy consumption. In addition, only air supplied through a layer of material in a vertical shaft can flow into a rotary kiln, and air from other cooling zones is vented outside, as the passage to the transition chamber is blocked by a rotating partition. This significantly reduces the thermal efficiency of the device. From the experience of operating cement kilns with a grate cooler, it is known) This air is discharged from 0.8 to 1.5 mLkg.kl of air with a temperature of up to 200 ° C, the installation of the same general blower blows up to 50 mm in reserve, increases the installed electric motor power from 0.3 to Q, kS kWh / t. The aim of the invention is to reduce energy consumption per blast and reduce fuel consumption. This goal is achieved by the fact that in a device for cooling bulk material, such as cement clinker, including a transitional grate-fridge chamber with a vertical partition forming gaps with a grate, the partition is installed with the possibility of moving in a horizontal direction in the directions mounted on the side walls chambers, with the cross section of the transition chamber cut into two parts with an area ratio p: n 1:10 to 10: 1. In addition, a feeder is installed at the end of the transition chamber at the end wall. The drawing is a schematic diagram of the proposed device. va for cooling bulk material, longitudinal section. Adjacent chamber 2 is connected to rotary kiln 1 with end wall 3, movable vertical partition k separating the chamber into two parts 5 and 6, and moving in guides 7 mounted on the side walls (movement drive U9 is not shown). A feeder 8 is installed at the end wall 3, the gaps 9 are formed by the bottom of the partition and the grate 10. Windows 11 are located under the grate 10 and in the end wall 3. The device works as follows. The material from the rotary kiln 1 enters the transition chamber 2 and further into its part 5 At the end wall .3 forming a shaft with the partition wall, the height of the layer and the residence time in which can be regulated by feeding 8c by unloading through the gaps E to the grate 10 o Cooling air through the windows 11 is supplied both with the vertical shaft of the cooling device and under the grate. The heated air from the shaft enters the furnace directly, and the air from cooling the material on the grate through the part of the transition chamber 6. The position of the movable partition and, accordingly, the dimensions of the parts of chamber 5 and 6 are determined by the grain size distribution of the material. For example, a rotary kiln of a wet cement production method, operating on solid fuels and easily caking raw materials, produces clinker with an equivalent granule diameter of 20 mm. In this case, the partition is placed in position A closer to the end wall of the transition chamber. Due to the mode of operation of the feeder, a layer of material is created to hold it up to the required cooling time of this fraction. The rotary kiln of the dry cement production method produces clinker with an equivalent diameter of 2 mm. Since the clinker layer with such granulometry has an increased resistance, the partition is set to position B to increase the cross section of the mine layer, and the feeder adjusts the height of the material in accordance with the cooling time of this fraction. It is known that the resistance value of the clinker layer can be represented by

,

eq /

where W is the air velocity;

thickness (height) of the layer; h equivalent diameter of granules With the above particle size fluctuations of 20-2 mm, in order to maintain the resistance constant while ensuring the necessary residence time in the cooling zone, it will be necessary to change the cross section of the mine in proportion 1

IlTTj

those. 1:10. Based on this, the limits of variation of the cross-sectional areas of both parts of the chambers are determined from 1:10 to 10: 1.

More intensive cooling of clinker in the transition chamber in its shaft part, the possibility of supplying heated air to the furnace from cooling the clinker on the grate reduces the total cooling air flow by increasing the degree of heating, reducing the emission of excess air beyond the installation limits by 0,. .

For one rotary kiln, the size fQflBS m, the economical consumption of fuel is pf dca. 3 kg / t Cl., Electric power 0.35 kWh / t Cl.

The annual economic effect from the introduction of the invention is 30 thousand rubles.

Claims (2)

1. A device for cooling bulk material, such as cement clinker, comprising a vertical partition wall grate cooler, forming gaps with a grate, characterized in that, in order to reduce energy consumption for blowing and to reduce fuel consumption, the partition is installed with the ability to move horizontal direction in guides mounted on the side walls of the chamber, with the cross section of the transition chamber divided into two parts with an area ratio from 1:10 to 10.:1. 2. The device according to claim 1, of which there is a feeder in the lower part of the transition chamber at the end wall, Sources of information taken into account in the examination 1. Authentic certificate of the USSR N, cl. F 27 B 7/38, 1972, i. Patent; FRG If 1551 17, cl. F 28 C 3/16, 1973 (prototype).