JPS58117992A - Device for recovering heat from hot temperature gas containing dust - Google Patents

Abstract

PURPOSE:To enable dust load on the downstream side to be reduced in the heat recovery of a converter by an arrangement wherein an inclined blade layer with variable blade angle is installed in a high temperature gas passage and particulate heating medium is supplied onto an inclined surface whose angle is an angle of repose or smaller than it. CONSTITUTION:A heat recovery device 1 comprises variable angle blades 5 located in a converter gas passage 3 and which are supported by a blade shaft 6 and which from a chamber through which water passes. An inclined surface 7 is formed on the inlet side, whilst gas passages 8 are formed between the variable angle blades 5. The blade angle 11 can be varied by means of a driving means 10. In operation, particulate heating medium accommodated in a hopper 12 is supplied to the variable angle blades 5 with a sufficient angle 11 which does not allow the medium to clog the clearances between the blades 5 whereby forming a continuous particulate heating medium layer extending to a feed hopper 17. Control of movement of the continuous layer is made by means of a feed valve 18, and control of unloading speed and the thickness of the layer is made by a group of drive shafts 9. Thus, the inclined surface 7 for the particulate heating medium corresponding to the angle of repose most of the dust is removed to reduce the dust load on the donwstream side, for example, in boiler water tubes 20. Further, a stable heat-resisting surface can be obtained due to a temperature drop obtained thereby.

Description

[Detailed Description of the Invention] This invention efficiently recovers the sensible heat of high-temperature, high-dust-containing byproduct gas (hereinafter explained using converter gas as an example) generated by blowing in an oxygen converter. The present invention relates to a device for recovering heat from dust-containing high-temperature gas. As is well known, in a converter, high-temperature converter gas of around 1600° C. is generated due to the heat of decarburization reaction during oxygen blowing, so the heat is usually recovered using an exhaust gas boiler. However, with this method, the arrangement of boiler tubes and heat transfer area are not sufficient, and heat recovery is limited to up to 1000°C. In addition, packed bed, moving bed, and fluidized bed methods that use solid particles or powder have been devised as methods for recovering and utilizing a large amount of waste heat, but the former two have high temperatures and high dust content. It has been pointed out that long-term stable operation is not possible in a gas atmosphere, and the latter is difficult to achieve due to fluctuations in gas during converter operation.

In view of the above-mentioned circumstances, the present invention recovers heat from converter gas without having a structure on the inlet side of the recovery equipment, thereby achieving stable performance in terms of equipment and operation against converter gas with high temperature and high dust content. This is a continuous inclined moving bed type heat recovery device using a granular heat medium that makes use of the angle of repose that makes it possible to obtain
The granular heating medium is tilted I! This is an apparatus for recovering heat from dust-containing high-temperature gas, which has a granular heat medium supply means for supplying to an inclined surface having an angle of repose equal to or smaller than that formed by the +X layer.

With this type of recovery, the dust-containing gas tart on the upstream side of the recovery device is captured by the granular heat medium, reducing the dust load on the downstream side, and the boiler tube for steam recovery at the rear of the recovery device is Installation is now possible. Furthermore, since the temperature of the converter gas that has passed through the granular heating medium and exchanged heat is lowered, the thermal influence on the inclined heterogeneous layer that supports the granular heating medium is alleviated, and its service life can be extended.

In this way, in this invention, the granular heat exchange medium that first comes into contact with dust-containing high-temperature gas such as converter exhaust gas is
A major feature is that it is not supported or guided by support and guide means such as inclined different layers.

With this configuration, the support and guide structures are not directly exposed to dust-containing high-temperature gas, so they can be lowered without being supported and guided by the zero structure, which is extremely advantageous in terms of equipment maintenance. In order for the granular heat exchange medium to receive heat from the dust-containing high-temperature gas and to trap and remove dust, in order to function smoothly in the system, the granular heat exchange medium must be supported and guided by the gas flow. Must descend in a vertical direction.

To do this, the granular heat exchange medium must descend in a cascade manner at an angle below the angle of repose on the hot side of the gas stream.

The present invention will be explained in detail below with reference to the illustrated embodiments.

FIG. 1 shows a converter gas exhaust heat recovery device showing an embodiment of the present invention. The recovery device 1 is installed in the gas flow path 3 of the converter gas collection duct 2, and is installed coaxially with a variable blade 5 having a water passage chamber 4 inside and supported outside the duct with respect to the variable blade 5. It is composed of a blade shaft 6, and both ends of the blade 6 are connected to each other so that cold water can be supplied or delivered from the outside. The variable blades 5 are arranged to face the gas flow and perpendicular to the descending direction of the granular heat medium.

An inclined surface 7 is formed on the gas inlet side of the recovery device 1 by a variable blade 5.
, and FJK is formed in the gas path 81 between the upper and lower variable X5.5'. The rear extension of the variable blade 5 is connected to a drive shaft 9 provided on the outer surface of the tact in order to drive the variable blade 5 using the blade shaft 6 as a fulcrum.
It is possible to change the By dividing the drive shaft 9, the slope of the #IfM surface 7 is the same, but since the blade angles 11 connected to each drive shaft can be changed, the actual slope can be set to the slope surface 7'. It becomes possible.

A supply port 13 is opened on the upper duct of the recovery device 1 and extends from a hopper 12 that stores and supplies granular heat transfer medium such as iron ore or solid materials. The granular heat medium in the hopper 12 is recovered! A fixed amount is supplied onto the 11 variable blades 5. For example, the opening position can be varied from the feeder 14 to the uppermost stage, taking into account the particle size and shape of the granular heat medium to be supplied. 5 and the thickness of the granular heating medium layer on the inclined surface 7, the entire feeding device is modified by moving the hopper 12 using wheels 15 on the iron track. 25 is a gas seal using a bellows or the like, and 26 is an inert gas introduction pipe for sealing.

A cutting hopper 17 with a stopper 16 installed on the upstream side of the gas is opened at the bottom of the recovery device #, 1, and the high I
jA The granular heat medium is received and discharged by the rotary valve 18.・ A gas flow meter 19 is arranged downstream of the gas iw & 8, and the balance of the gas flow in the gas flow path 8 is detected using the detection value of the gas flow meter 19.
By controlling the opening position of No. 2, uniform heat exchange without gas drift is performed.

A boiler water pipe 20 is composed of, for example, a water supply preheating pipe, an evaporation pipe, etc. The boiler water pipe 20 is located on the gas downstream side of the heat recovery device 1 and is composed of convection heat transfer tubes arranged in the cross section of the tact.

FIG. 2 shows an example of application to a converter gas duct 2 during oxygen blowing steel manufacturing. Converter gas generated from the converter 21 is sucked and collected by the induction fan 22 and stored in the holder 23 . Converter gas sensible heat is recovered in the exhaust gas boiler 24, and further in the exhaust heat recovery device 1, it is collected as a granular heat medium and a convection diler 20.
Although the present invention is configured as described above, during operation, the blade angle 11 is sufficient to prevent the granular heat medium in the hopper 12 from staying in the gap between the variable blades 5. It is supplied to the variable X5 having a
The amount of movement during continuous operation to form a continuous layer of granular heat transfer medium is controlled by the cutting valve 18 of the cutting hopper 17, and the supply valve 14 is opened to control the unloading speed and layer thickness. By changing the drive shaft group 9, it is possible to create a more free gradient of the inclined surface 7.

As described above, since this invention is a converter gas exhaust heat recovery device having an inclined surface 7 corresponding to the angle of repose of the granular heat medium, most of the dust in the gas can be removed by the moving granular heat medium layer. , there is less dust adhesion and clogging of the variable blades, and in the variable x5, the high temperature converter gas exchanges heat with the granular heat medium and comes into contact with the variable blades 5 after the temperature decreases, thereby achieving stability in heat resistance.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is an implementation flow diagram, and FIGS. 83(a) and 83(b) are diagrams showing the principle of variable true operation. 5... Variable x 6... Wing shaft 9... Drive shaft 7... Unloading #jfP+ surface. 0 @ 3 Figure (a) (or)

Claims (1)

[Claims] A granular heating medium supplying means is provided, in which the internal pressure of the high-temperature gum flow path is provided with an inclined different layer whose blade angle is variable, and the granular heating medium is supplied to an inclined surface having an angle of repose formed by the inclined different layer or an angle smaller than that. A device that recovers heat from metal high-temperature gas.