JPS5997557A - Grain and granular body preheating device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder preheating device which is advantageous in terms of device cost.

Cement burner/plant preheaters (suspension breheaters), which have been in practical use for a long time, generally have multiple stages (4 to 5 stages) of cyclones or vortex chambers arranged vertically, and are suspended in hot gas. This is a powder (cement raw material) separation device, and there is a duct that connects these two, and the powder separated by a cyclone etc. is first introduced into the suspension bleeder and the raw material is introduced into the hot gas. In the Schutler combination, the kiln exhaust gas (hot gas) introduced from the bottom of the breheater section and the crushed cement raw material introduced from the top of the suspension breheater flow countercurrently and come into contact with each other to exchange heat and heat the cement raw material. (then sent to rotary kiln).

The weight of each of the above-mentioned devices constituting a conosuspension breaker heater is usually supported by a copper or reinforced concrete frame built from the ground.

In this case, the amount of equipment for the frame occupies a large proportion of the entire suspension brake heater equipment (the frame steel material MU is about 1/2 the weight of the suspension brake heater gold and copper). Therefore, it is necessary to select a frame structure that requires as few steel materials as possible in order to reduce equipment costs.

Furthermore, since the construction of a suspension breaker heater involves stacking heavy objects one by one starting from the bottom, the construction period usually takes 5 to 6 months. Therefore, in order to reduce costs, it is necessary to simplify the structure and the equipment contained within it so that construction can be completed in a short period of time, and to reduce the required man-hours.

In addition, because conventional structures consist of vertical beams, vertical columns, and place materials that strengthen the structure, equipment such as Taijuryu's cyclone must be supported vertically with beams that span the entire length of the structure. , Therefore, the weight of the steel material needs to be increased. ■ Place material is required to support the horizontal earthquake and wind load = '. Both the number of parts and the weight of the steel increase.
Therefore, there were problems such as the number of man-hours required for manufacturing. In order to reduce the cost of a cement firing plant and shorten the period required for plant construction, the present invention combines the bodies of each cyclone with a cylinder, and the cylinder is connected to the cylinder. The purpose of this design was to simplify the structure of the suspension preheater by providing a frame function.

That is, the present invention provides a powder and granular material preheating device in which a plurality of cyclones are stacked vertically, in which the cyclone placed on the upper side of the preheating device is supported inside a hollow cylindrical body, and the cyclone is placed on the lower side. The present invention relates to a preheating device for powder and granular material, characterized in that a cyclone is supported by a frame, and the cylindrical body is placed on the frame.

Hereinafter, the apparatus of the present invention will be described in detail with reference to the first page.

FIG. 1 is a diagram showing one of the suspension preheaters having the IN1/: structure.

Figure 1 shows 1.・Cyclone 4.5 that constitutes the device
．． Equipment such as 6 and the swirl chamber 7 are supported on a frame structure constructed from the ground and consisting of pillars 1 and beams 2 and place materials 15. Each device is connected to raw material chutes 8 to 10 and gas ducts 11 and 12. Cement raw materials are introduced into the kiln through the raw material chute 8, which opens into the gas duct 11a that connects the uppermost cyclone 4 and the intermediate cyclone 5 located below it. 3 discharged from kiln 3 and whirlpool chamber 7
It exchanges countercurrent heat with the high-temperature gas flowing upward through the kiln gas duct 12 connecting the kiln gas ducts 2, is collected by the lowermost cyclone 6, passes through the kiln introduction raw material chute 10, and is transferred to the kiln as preheated raw material. 6.

At this time, the temperature of the cement raw material is generally about 820 to 900 degrees Celsius at the inlet of the kiln, and the cement raw material at that temperature has quite strong stickiness due to the alkali substances involved.
In order to operate the equipment stably over a long period of time, it is necessary to regularly clean the cyclone cone section, the chute section, etc., and a large number of cleaning openings and a large work space are required for operational or safety reasons. . In addition, in the case of cement raw materials, the tackiness decreases rapidly at temperatures below about 850° C., reducing maintenance troubles. This relationship is shown in FIG. 3 using data obtained from the operational results of the actual device. In FIG. 5, a curve 100 is an example of the operating conditions of an actual device, and an area α is an area where the cement raw material is highly adhesive.

The device of the present invention utilizes this characteristic, and FIG. 2 shows an example of an embodiment of the device of the present invention.

In Figure 2, the same symbols as in Figure 1 indicate the same parts as in Figure 1,
1s is a cyclone cylinder part, 14 is a solar eclipse shell, and 16 is an exhaust gas duct.

As shown in FIG. 2, the device of the present invention is capable of handling equipment that requires a large space and exhibits a temperature of 800°C or higher, as described above.
Conventionally, the cyclone 4 is installed in a frame section with 7L of spare space, but the cyclone 4 is installed in the intermediate stage or higher where the temperature is below 800℃.
, 5 connects the cylindrical portions 16 of each cyclone 4, 5 to form one
The cylindrical shell 14 is generally constructed on a frame structure. In general, the lower part of this type of equipment is subject to large layer shear and layer moment due to horizontal earthquakes and wind loads, and as mentioned above, high-temperature materials are handled during the process, so the 14th structural strength is It needs to be bigger. Therefore, in the device of the present invention as well, the lower side has a support structure consisting of pillars, brackets, and press materials similar to those of the conventional device. Since only the lower side has such a structure, the layer shear and layer moment applied to the lower side are smaller than those of the conventional structure shown in FIG.

As described above, in the device of the present invention, by storing Zyclone in the cylindrical structure and omitting the frame, the required tank weight can be reduced by υ, and since the cylindrical body can be stacked as blocks, the necessary construction is possible. Not only does it save material, it also reduces the number of man-hours and construction period. Although not shown, a platform necessary for inspection and other work on the cylindrical body is installed with an overhang of the weight of the small button from the cylindrical body.

The device of the present invention can be applied not only to the above-mentioned cement calcination plant but also to a coal calcination plant and a general heating device for powder and granular materials using hot gas.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a conventional preheating device, Fig. 2 is a diagram showing an example of an embodiment of the device of the present invention, and Fig. 5 is a diagram showing an example of a conventional preheating device.
FIG. 1,111 people from 19 generations 1) Akira - Agent Ryo Hagiwara -

Claims (1)

[Claims] In a powder preheating device made by stacking multiple cyclones vertically, the cyclone placed on the upper side of the preheating device is supported inside a hollow cylindrical body, and the cyclone placed on the bottom side. A preheating device for powder and granular material, characterized in that the cylindrical body is supported by a frame, and the cylindrical body is placed on the frame.