JPS62213686A - Raw-material powder preheater with calciner - 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 Field of Industrial Application This invention relates to a raw material powder child heating device with a calcining furnace, particularly for calcining used for firing powdery raw materials such as cement raw materials, alumina raw materials, or limestone powder. This invention relates to a raw material powder child heating device with a furnace.

Prior Art Conventionally, this type of raw powder child heating device with a calcination furnace (hereinafter referred to as
The preheating device) is equipped with, for example, a calcining furnace in which a mixing chamber and a combustion chamber are formed above and below with the intermediate drawing part as a boundary, and the preheated raw material powder is supplied from the lower powder mixer of the preheating device to the calcining furnace. In this case, a method is known in which preheated raw material powder is distributed and supplied to a combustion chamber and a mixing chamber of a calciner. Such a preheating device is typically disclosed in Japanese Unexamined Patent Application Publication No. 140345/1983, which was filed by the applicant of the present invention.

First, the outline of the raw material powder child heating device with calcining furnace provided in this application will be explained using FIGS. 4 and 5.

Figure 4 shows, for example, cement raw material powder being preheated, calcined,
This is a diagrammatic system diagram showing the firing and cooling process, in which the solid arrows indicate the flow of hot air, and the dashed arrows indicate the flow of raw material powder.

This device mainly consists of a preheating device 1. Inlet end cover 1 of firing furnace 3 whose raw material powder outlet will be described later
A calcining furnace with a separation cyclone C connected to 2.
Kiln such as rotary kiln for burning clinker3. and a clinker cooling device 4.

In such a cement raw material firing device, the input chute 5
The raw material powder inputted from above descends sequentially through powder separators 01 to C3. On the other hand, high-temperature exhaust gas discharged from the firing furnace 3 and the calcining furnace 2 provided in communication with the inlet end rJ, 12 of the firing furnace 3 is transferred to the induced draft fan 8.
is sucked by the material and rises inside the material preheating device 1. Therefore, the inside of duct 7 and the powder! Within Bc+-ci,
Mixing, heat exchange, and separation of raw material powder and hot gas are repeated.

The preheated raw material powder is introduced into the calcining furnace 2 from the raw material preheating device 1 through the preheated raw material shoe 14. A bleed air duct 13 communicating with the clinker cooling device 4 is connected to the calcining furnace 2 , and high-temperature air generated in the clinker cooling device 4 is introduced into the calcining furnace 2 .

In the calcining furnace 2, combustion occurs with this high-temperature air and fuel supplied together with secondary combustion air from a unique burner 61, and the combustion heat and the heat of the exhaust gas introduced from the calcining furnace 3 are combined. By receiving the powder, the raw material powder is calcined.

In this way, the calcined raw material powder enters the separation cyclone C4 connected to the combustion gas outlet 2I side of the calciner 2 together with the combustion gas and is separated.
The raw material powder is sent to the inlet fmii 12 via After the necessary heat treatment is applied and the clinker is turned into a cooling device? ! It is cooled at 4.

Note that air for cooling the clinker is supplied by the forced air blower 10, and a part of the air that has been heated by exchanging heat with the clinker is distributed and introduced into the calcining furnace 2 and the calcining furnace 3 as described above. The air is exhausted by the induced draft fan 9.

Then, the clinker discharged from the clinker cooling device 4 is transported to the next process by a conveyor 11.

FIG. 5 is a conceptual diagram showing the structure near the calciner in FIG. 4 in more detail, and directly shows the background of the present invention. The explanation is as follows.

That is, the calcining furnace 2 has a substantially cylindrical vertical shape, and has lower combustion chambers 2. and upper mixing chamber 2
It consists of The lower end of the combustion chamber 2° is an inverted conical part whose cross section gradually decreases downward.
The opening 2a is connected to the firing furnace 3 via the inlet end cover 12.

Further, a bleed air duct 13 that guides high temperature secondary combustion air from the clinker cooling device 4 is connected to the lower side wall of the combustion chamber 21 in the radial or tangential direction through an opening 2e. The ceiling wall of the duct 13 is the combustion chamber 26
The combustion chamber 2. A burner 6□ is installed that blows fuel together with secondary air toward the high-temperature air flowing into the tank.

And combustion chamber 2. and a preheating device i in the mixing chamber 2i.
! A preheated raw material chute 14 that communicates with the lowermost powder separator C1 is connected. Particularly here, the preheated raw material chute 14 is connected to the first fal feed'/s-t 14 by a branching member 14- equipped with a distribution valve 14e whose mounting angle is adjustable.
．． and second layer feed shoe) 14i.

It was branched into the 1111th! The feed chute 141 is connected to the combustion chamber 2 of the calcining furnace 2. Also, the 2119th transmission shot 14I.

is connected to the mixing chamber 2 of the calcining furnace 2.

In the calcining furnace configured in this way, for example,
Compared to the case of a normal calcining furnace in which the entire amount of preheated raw material is supplied to the combustion chamber 28, the following functional features can be provided.

■ Combustion chamber 2. Since only a portion of the preheating raw material is supplied to the combustion chamber 21, the inside of the combustion chamber 21 can be maintained at a high temperature, and the combustibility of the fuel is improved.

Therefore, it is possible to use solid fuel or low-grade fuel, and since there is less excess air, fuel consumption is reduced.

■ Combustion chamber 2. As the temperature inside increases, this combustion chamber 2. Heat transfer from the combustion gas to the raw material powder is promoted based on the large temperature difference between the two,
Effective and rapid calcination is achieved including the raw material powder supplied to the mixing chamber 2b.

Problems with the Prior Art On the other hand, in the preheating device t as described above, for example, (1) the raw material powder directly supplied from the powder separator C3 to the mixing chamber 2I does not pass through the combustion chamber 2° along with the rising gas; Since it is discharged to the separation cyclone C4 at the same time, the residence time in the calciner 2 is shortened. As a result, among the raw material powders supplied to the mixing chamber 2, fine powder raw materials with relatively small particle sizes can be calcined to a fairly high degree, but coarse powder raw materials with relatively large particle sizes can be calcined to a high degree. It will be discharged to the separation cyclone C1 without being sufficiently calcined.

■ In addition, in order to prevent a part of the hot air (high temperature gas) from rising from the calciner 2 via the preheating raw material chute 14 to the powder separator C3 in a short circuit, the preheating raw material chute 14 is provided with appropriate A gate valve 16 is equipped. Also, gate valve 16
The upper part of the chute requires a length to allow the preheated raw material powder to accumulate at an appropriate height in this chute and enhance the partitioning effect. In addition to requiring a joint (not shown) for absorbing thermal expansion, it is also necessary to provide the preheating raw material chute 14 with a branching member 14a. Accordingly, based on the functions and configurations that should be provided by the preheating material sheath 14 and the 21112th feed chute 14I that connect the powder separator C3 and the mixing chamber 2b, the preheating device fi! The relative height iV of the powder separator C, which is the lowest stage of the powder separator C, from the calciner 2 is determined by each of these chutes 14, 141. Moreover, the position (2) in the height direction must be located at a considerably high position as described above, resulting in the problem that the entire preheating device becomes tall.

In particular, in the case of an existing preheating device in which the relative height of the powder separator C3 from the calciner 2 has already been determined, it is not possible to additionally connect the m-th feed chute 141 due to these constraints. The problem was that it became difficult.

Furthermore, the temperature inside the combustion chamber 21 varies between the combustion chamber 28 and the mixing chamber 21. It is adjusted by the ratio of distribution of preheated raw materials to
The temperature is assumed to be 050°C. This requires that 90-50% of the preheated raw material from the powder separator C3 be distributed and supplied to the combustion chamber 211, and the remaining 10-50% to the mixing chamber 2+.

By the way, in the calcination furnace 2, the temperature inside the combustion chamber 2 varies considerably due to fluctuations in the operating state of the calcination equipment, and if the temperature within the combustion chamber rises too much, the coating of the raw material on the furnace wall of the combustion chamber may occur. However, if the temperature is too low, the combustion performance of the fuel and the calcining performance of the raw materials deteriorate.

OBJECTS OF THE INVENTION Therefore, the main object of the present invention is to use a relatively fine powder raw material as the preheated raw material that is directly supplied to the mixing chamber from the upper part of the calciner along with the rising gas, and to It is an object of the present invention to provide a raw material powder child heating device with a calcination furnace that can sufficiently calcinate the preheated raw material by using a relatively coarse raw material as the preheated raw material that is dropped and supplied into the combustion chamber from the combustion chamber.

Another object of the present invention is to lower the height of the powder separator located at the lowest stage of the preheating device, thereby reducing the height of the entire device. An object of the present invention is to provide a child heating device.

Still another object of the present invention is to provide a raw material powder child heating device with a calcination furnace that can be easily used in existing preheating devices.

A further object of the present invention is to, in addition to at least one of the above objects, even if there are fluctuations in the operating state of the calcining apparatus, such as fluctuations in the amount of high-temperature gas passing through the calcining furnace, for example, Immediately adjust the distribution ratio of the preheated raw material to the combustion chamber and the mixing chamber, or adjust the amount of preheated raw material supplied to the upper part of the combustion chamber dispersed into the rising gas toward the mixing chamber to perform calcination. It is an object of the present invention to provide a raw material powder child heating device with a calcining furnace that can appropriately maintain the temperature of a combustion chamber in a furnace.

Structure of the Invention In order to achieve the above object, the main means adopted by the present invention are: a preheating device equipped with at least one powder bone M'15; a calciner disposed between the calciner and the calciner, the calciner having a mixing chamber and a combustion chamber above and below, with a constriction section provided in the middle thereof as a boundary; The apparatus includes a preheating raw material chute extending from a powder separator disposed at the lowest stage of the preheating device and connected to an upper part of the combustion chamber including the throttle part and a lower part of the combustion chamber, A raw material distribution means for adjusting the ratio of the supply amount of the preheated raw material supplied to the upper part of the combustion chamber and the lower part of the combustion chamber is provided, and the means for distributing the preheated raw material is provided in the upper part of the combustion chamber near the connection part of the preheated raw material chute to the upper part of the combustion chamber. The point is that a raw material dispersion means is provided for dispersing at least a part of the supplied preheated raw material into the rising gas heading from the combustion chamber to the mixing chamber, and in order to more effectively achieve this purpose, the above-mentioned A preheating device equipped with at least one powder separator as a device including a control means for controlling the raw material distributing means or the raw material dispersion means, and a preheating device and a kiln between the preheating device and the firing furnace when viewed in the flow direction of the raw material powder. In a raw material powder child heating device with a calcination furnace, the calcination furnace has a mixing chamber and a combustion chamber above and below, with a constriction part provided in the middle part of the calcination furnace as a boundary,
A preheating raw material chute is provided that extends from a powder separator disposed at the lowest stage of the preheating device and is connected to an upper part of the combustion chamber including the throttle part and a lower part of the combustion chamber, and the lower part of the combustion chamber, a raw material distributing means is provided for adjusting the proportion of the supply amount of the preheated raw material supplied to the upper part of the combustion chamber, and the preheated raw material chute is arranged near the connection part of the preheated raw material chute to the upper part of the combustion chamber. A material dispersion means is provided for dispersing at least a portion of the preheated material into the rising gas heading from the combustion chamber to the mixing chamber, and a temperature detection device is provided on the side wall of the combustion chamber to adjust the temperature of the combustion chamber to a desired temperature. In order to achieve this, the method further comprises a control means for controlling the raw material distributing means or the raw material dispersion means in accordance with a detection signal from the temperature detector.

First, as a function according to the above-mentioned main means, the preheating device includes a preheating raw material chute extending from the powder separator arranged at the lowest stage to the calciner, and the preheating device distributes a predetermined distribution ratio by the raw material distribution means provided in the preheating device. When distributing and supplying the preheated raw material from the lowest powder separator of the preheating device to the upper and lower parts of the combustion chamber according to the By this means, a part of the preheated raw material distributed and supplied to the upper part of the combustion chamber is directly introduced into the mixing chamber from the above-mentioned supply section along with the rising gas. Further, the remaining part of the preheated raw material falls downward due to inertia without riding on the rising gas, and is introduced into the combustion chamber maintained at a high temperature.

At this time, the preheated raw material supplied to the upper part of the combustion chamber is classified by the rising gas, and the preheated raw material directly introduced into the mixing chamber becomes finer than other preheated raw materials that have fallen to the combustion chamber side. . Therefore, among the preheated raw materials supplied to the upper part of the combustion chamber, even if the preheated raw materials that were introduced directly into the mixing chamber along with the rising gas are immediately discharged to the separation cyclone C4 side, Since this preheated raw material is in the form of a relatively fine powder, it can be sufficiently calcined in such a short time. On the other hand, the preheated raw material on the coarse powder side that fell into the combustion chamber from the upper part of the combustion chamber and the preheated raw material supplied to the lower part of the combustion chamber from the preheating device are kept at a high temperature inside the combustion chamber, and are kept at a high temperature in the calciner. Because the residence time is long, sufficient calcination is achieved.

At this time, the connection position of the preheated raw material chute to the calciner when a part of the preheated raw material is directly supplied to the mixing chamber is compared to the connection position of the same chute when the preheated raw material is supplied to the upper part of the combustion chamber including the throttle part. is set lower. Therefore, even if the height of the preheated raw material chute from the lower end of the lowermost powder separator of the preheating device to the branch member provided in the middle of the preheated raw material chute is the same, such a configuration By doing so, the MW of the powder at the lowest stage can be lowered.

Next, the action of the control means that is added to the above means and controls the raw material distribution means or the raw material dispersion means is, for example, based on fluctuations in operating conditions such as the amount of talin force produced in the firing device. Even if the amount of hot gas passing through the combustion chamber changes, and therefore the blowing up speed of hot gas at the preheating material supply section to the upper part of the combustion chamber, the temperature of the combustion chamber changes accordingly, the temperature detector When the temperature within the combustion chamber is detected and this detected signal is sent to the control means, for example, the control means controls the raw material distribution means in accordance with this detected signal. Thereby, the ratio of the preheated raw material supplied to the upper and lower parts of the combustion chamber is adjusted.

Alternatively, when the detected signal is sent to the control means, the control means controls the raw material dispersion means in accordance with this detection signal. Thereby, the amount of dispersion of the preheated raw material supplied to the upper part of the combustion chamber into the rising gas is adjusted.

Effects of the Invention According to the present invention, the preheated raw material that is supplied to the upper part of the combustion chamber and immediately introduced into the mixing chamber along with the rising gas is a relatively fine powdered raw material that can be easily calcined, and the combustion The preheated raw material that falls and is supplied from the upper part of the chamber to the lower part is classified as a relatively coarse powder raw material, and the coarse raw material in particular is held in a high temperature atmosphere in the combustion chamber of the calciner. Since the residence time of the preheated raw material can be increased, the preheated raw material can be sufficiently calcined regardless of whether it is a fine powder or a coarse powder.

Further, according to the present invention, the lowermost powder portion jI of the preheating device
The installation height of the II device can be lowered, and the height of the entire preheating device can be lowered. Therefore, the relative position in the height direction of the lowest powder separator and the calciner can be determined in advance. It can also be used relatively easily with existing preheating devices.

Furthermore, even if the amount or speed of high-temperature gas passing through the calcining furnace fluctuates due to fluctuations in the operating conditions of the calciner, the amount of high-temperature gas introduced into the combustion chamber and the mixing chamber can be adjusted according to this fluctuation. Since the quantity of the raw material on the fine powder side can be easily adjusted, the temperature of the combustion chamber can be maintained appropriately.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

Fig. 1 is a system diagram schematically showing the configuration of the vicinity of the calcination furnace of a raw material powder child heating device with a calcination furnace according to an embodiment of the present invention;
FIG. 3 is a system diagram schematically showing a modification of the embodiment shown in FIG. 1, and FIG. 3 is a system diagram schematically showing another modification of the embodiment shown in FIG.

In addition, the following example is only one specific example of this invention, and the technical scope of this invention is not limited by this example. Further, the same reference numerals will be used to describe elements common to those near the calciner shown in FIG. 5.

In FIG. 1, this preheating device with a calcining furnace is different from the same device shown in FIG. )14. The 21st branched out! ! Feed chute 1
4+,' is this 1111th! Above the feed chute 14□, the throttle part 2c (forms the upper end of the combustion chamber 2.)
A raw material dispersing plate 17, which constitutes a part of the raw material dispersing means, is connected to the constricting part 2c at the bottom of this connecting part 23.
It is attached so that it protrudes almost horizontally towards the inside of the housing.

This raw material distribution plate 17 is inserted into the combustion chamber 28 through the connection part 23.
The preheated raw material introduced into the upper part of the combustion chamber 21 collides with the dispersion plate 17 to diffuse the preheated raw material and effectively perform the desired classification. The mounting angle can be adjusted as appropriate.

Next, the combustion chamber 28 is located below the raw material distribution plate 17.
A temperature sensor 18 is installed in the upper part of the . This temperature detector 18 measures the temperature inside the combustion chamber 21, and detects the opening/closing operation of the distribution valve 14c, that is, the opening and closing operation of the distribution valve 14c, that is, the opening and closing of the distribution valve 14c. A control device equipped with a distribution valve adjustment device 19 that adjusts the opening degree, such as whether the feed chute 14 opens more toward the side! 20.

Therefore, here, a signal of the temperature within the combustion chamber 21 detected by the temperature sensor 18 is sent to the control device 20, and the control device 20 controls the distribution valve adjustment device 19 to control the distribution valve 14 in response to this detection signal. The amount of preheated raw material supplied toward the connection portion 23 is further adjusted by instructing the opening degree adjustment of the connection portion 23 .

Thus, in this raw material powder child heating device with a calcination furnace, the preheated raw material is supplied to the calcination furnace 2' side from the powder separator 03 located at the lowest stage of the preheating bag "iH1" via the preheated raw material shoe) 14. Then, the preheated raw material is distributed at an appropriate ratio to the 11112nd feeding chute 14. side and the second feeding chute 14t,' side by the distribution valve 14c of the intermediate branching member 14a.

The preheated raw material supplied to the second conveyance chute 14t,' side is on the downstream side (upper side) when viewed in the flow direction of the raw material powder.
That is, it is supplied to the upper part of the combustion chamber 21. The preheated raw material supplied through the connection part 23 is dispersed by the raw material distribution plate 17 disposed near the connection part 23, and the relatively fine powder of the dispersed preheated raw material is blown up by the rising gas. The gas is directly introduced from the connecting portion 23 into the mixing chamber 2b along with the rising gas. Further, the relatively coarse powder material, which is the remainder of the preheated material, falls downward due to inertia without riding on the rising gas, and the combustion chamber 2, which is maintained at a high temperature. will be introduced in

At this time, the combustion chamber 2. The preheated raw material supplied to the throttle section 2c constituting the upper end is classified by the rising gas, and the preheated raw material directly introduced into the mixing chamber 2I is transferred to the combustion chamber 2. Compared to the pre-iQ raw material that falls on the side, the raw material is on the fine powder side. Therefore, even if the preheated raw material dispersed in the mixing chamber 2t is in a state where it is immediately discharged to the separation cyclone C4, the preheated raw material is in a relatively fine powder form, so that even within that short time it is sufficient to It can be calcined. On the other hand, the relatively coarse raw material that has fallen downward from the top of the combustion chamber and the preheated raw material that has been supplied to the bottom of the combustion chamber from the preheating device are affected by the high temperature atmosphere inside the combustion chamber and the long residence time in the calciner. Can be sufficiently calcined.

Further, as shown in FIG. 5, the preheated raw material chute 14
and second conveyance chute 141. When a part of the preheated raw material is directly supplied to the mixing chamber 2 through
When a portion of the preheated raw material is supplied to the upper part of the combustion chamber 21, the connection position of the chute 14I,' can be set sufficiently lower. Accordingly, even if the height of the preheating raw material chute 14 from the lower end of the lowermost powder separator C1 of the preheating device 1 to the branching member 14- is the same, the relative height of the lowermost powder separator C3 svl is V, <V (as shown in Figure 5)
The height of the preheating bag W11 can be reduced.

By the way, in order to properly maintain the temperature inside the combustion chamber 21, raw materials are supplied from the upper part of the combustion chamber 21 to the mixing chamber 2t directly along with the rising gas, and raw materials are supplied from the preheating device l to the calciner 2. It is necessary to maintain the quantitative ratio with respect to the total preheated raw material supplied to . Therefore, the preheated raw material discharged from the lowermost powder separator C1 of the preheating device 1 is transferred to the combustion chamber 2 through the branching member 14a. When distributing and supplying at a constant ratio to the upper and lower parts of the combustion chamber 2. The raw material is introduced directly into the mixing chamber 2 along with the rising gas at the upper part of the combustion chamber 2.
．． It is also necessary to maintain the quantitative ratio of the raw materials falling and being supplied into the tank almost constant.

However, if the amount of gas passing through the combustion chamber 2□ fluctuates, for example when the talin force production amount in the firing device fluctuates, the rising gas velocity at the throttle part 2c will change, and accordingly, the second Of the preheated raw materials supplied from the hidden feed chute 14' to the throttle section 2c, the raw materials directly introduced into the mixing chamber 2 and the combustion chamber 2. This causes a change in the quantitative ratio of the raw material falling into the combustion chamber 2□, and as a result, the temperature within the combustion chamber 2□ fluctuates.

Therefore, the temperature detector 18 is installed on the side wall of the combustion chamber 21, and the temperature sensor 18 is installed on the side wall of the combustion chamber 21. Detects the internal temperature and sends this detected value to the control device 2.
0, and the control device 20 controls the distribution valve 14e via the distribution valve adjustment device 19 in accordance with this detected temperature value. As a result, the combustion chamber 2 detected by the temperature detector 18. The ratio of preheated raw materials supplied to the upper and lower parts of the combustion chamber 21 is adjusted so that the temperature within the combustion chamber 21 reaches a desired value.

Next, with reference to FIG. 2, a modification of the embodiment shown in FIG. 1 will be described. This modification device includes a bleed air duct 13.combustion air connected to the lower end of the calciner 22. This is a common example where the exhaust gas from the calcination furnace 3 is not introduced into the calcination furnace 22, and compared to the embodiment shown in FIG. 23' opens near the upper end of the straight cylindrical part of the combustion chamber 2□, and the temperature sensor 1 is a dispersion plate adjustment device i! that adjusts the operating state of the raw material dispersion plate 17'. The difference is that it is connected to a control device 20' having a control unit 19'.

That is, according to this, the temperature signal inside the combustion chamber 2□ detected by the temperature detector 18 is sent to the control device 20', and the control device 20' judges this and sends the signal to the distribution plate adjustment device 19'. Indicates the installation and operating state (insertion length and/or installation angle) of the raw material distribution plate 17' in the combustion chamber 2□, and indicates the dispersion status of the preheated raw material supplied through the connection part 23' into the rising gas. By articulating the combustion chamber 2. Adjust the temperature inside to the desired value.

Incidentally, the firing furnace exhaust gas is introduced from the duct 21 into a preheating device of another system (not shown), or is discharged to the outside of the system as it is.

For example, if the height of the preheating raw material shoe (14) from the lower end of the powder separator C3 at the lowest stage of the preheating device 1 to the branching member 144 is the same as that of the conventional device shown in FIG. , ' can be connected to a lower part than in the case of the preheating device 1 shown in the first figure, so the powder separator c3 at the lowest stage can be placed lower (V2 < Vl (shown in the first figure)). )), thereby making it possible to reduce the height of the preheating device 1.

Further, with reference to FIG. 3, another modification of the embodiment shown in the first diagram will be described. In this modified example device, compared to the example device shown in FIG. 1, the preheating device i! Coarse powder separator C1 that separates the coarse powder side raw material of the preheated raw material into the lowermost powder separator C3 of No. 1
A preheated raw material chute 14' is provided, and a preheated raw material chute 14' extends from the lower end of the coarse powder separator C, / toward the combustion chamber 21, and is appropriately connected to the first conveyance chute 14□ of the preheated raw material chute 14. They differ in some respects.

That is, according to this, the preheated raw material can be classified in advance into the coarse powder side raw material and the fine powder side raw material in the powder separator C3 and the coarse powder separator C,/, and at least a part of the fine powder side raw material to the upper part of combustion chamber 2□, and the raw material on the coarse powder side to the upper part of combustion chamber 2
．． can be supplied to the bottom of each. This has the advantage that the fine powder side raw material can be supplied to the mixing chamber 2t more efficiently.

In addition, in the above-mentioned embodiment apparatus, the type of calciner, the type of preheating device (the number of series, one stage, etc.), the configuration of the raw material distribution means and the raw material dispersion means, and the configuration of the calciner for combustion air or firing furnace exhaust gas. There are no restrictions on the form of introduction, etc.

Furthermore, in each of the embodiments described above, the opening degree control of the distribution valve via the distribution valve adjustment device and the control of the mounting position of the distribution plate via the distribution plate adjustment device are performed individually. However, the two types of control means described above can be used in combination, if necessary.

[Brief explanation of drawings]

FIG. 1 is a system diagram schematically showing the configuration of the vicinity of the calciner of a raw material powder child heating device with a calciner according to an embodiment of the present invention;
FIG. 3 is a system diagram schematically showing a modification of the embodiment device shown in FIG. 1, FIG. 3 is a system diagram schematically showing another modification of the embodiment device shown in FIG. Fig. 5 is a diagrammatic system diagram of a raw material powder unsintering device including a raw powder heating device with a calcination furnace, which is the background of the calcination furnace. It is a main part system diagram. (Explanation of symbols) 01-C3... Powder bone jlt machine C1... Separation cyclone 1.2', 22... Calciner 2a... Combustion chamber 2L... Mixing chamber 2c... Throttle Part 3...
- Firing furnace 6□, 6&, 6c... combustion supply device 14
．． 14'... Preheating raw material chute 141... First conveyance chute 14k, 146'... First conveyance chute 14
□...Distribution valve 14a...Branch member 17.
17'... Raw material distribution plate 18... Temperature detector 19... Distribution valve adjustment device 19'... Distribution plate adjustment device 20. 20'... Control device.

Claims (1)

[Claims] 1. A preheating device equipped with at least one powder separator, and a calcination furnace disposed between the preheating device and a calcination furnace when viewed in the flow direction of the raw powder, In the raw material powder child heating device with a calcination furnace, in which a mixing chamber and a combustion chamber are formed above and below with a constriction section provided in the middle part as a boundary, the powder separation device is arranged at the lowest stage of the preheating device. A preheated raw material chute is provided that extends from the vessel and is connected to an upper part of the combustion chamber including the throttle part and a lower part of the combustion chamber, and is supplied to the upper part of the combustion chamber and the lower part of the combustion chamber to the preheating device. A raw material distributing means for adjusting the ratio of the supply amount of the raw material is provided near a connection portion of the preheated raw material chute to the upper part of the combustion chamber, and at least a part of the preheated raw material supplied to the upper part of the combustion chamber is distributed from the combustion chamber to the upper part of the combustion chamber. A raw material powder child heating device with a calcination furnace, which is provided with a raw material dispersion means for dispersing the raw material into the rising gas heading toward the mixing chamber. 2. A preheating device equipped with at least one powder separator, and a calcination furnace disposed between the preheating device and a calcination furnace when viewed in the flow direction of the raw powder, and the calcination furnace includes: In a raw powder child heating device with a calcination furnace, in which a mixing chamber and a combustion chamber are formed above and below with a constriction section provided in the middle thereof as a boundary, the preheating device is extended from a powder separator disposed at the lowest stage of the preheating device, A preheating material chute is provided that is connected to an upper part of the combustion chamber including the throttle part and a lower part of the combustion chamber, and the preheating device is configured to control the ratio of the amount of preheated material supplied to the upper part of the combustion chamber and the lower part of the combustion chamber. Feedstock distribution means are provided for regulating, near the connection of the preheated feed chute to the upper part of the combustion chamber, at least a portion of the preheated feed supplied to the upper part of the combustion chamber, in the ascending gas direction from the combustion chamber to the mixing chamber. A means for dispersing the raw material to be dispersed into the combustion chamber is provided, and a temperature sensor is provided on a side wall of the combustion chamber, and the raw material is distributed according to a detection signal from the temperature sensor in order to bring the temperature of the combustion chamber to a desired temperature. or a control means for controlling the raw material dispersing means. 3. The preheated raw material chute is branched at an intermediate portion thereof toward an upper side and a lower side of the combustion chamber, and the raw material distribution means is configured to direct the preheated raw material to the combustion chamber at the branched portion. The raw powder child heating device with a calciner according to claim 1 or 2, comprising a distribution valve that distributes the powder at a predetermined ratio toward the upper side and the lower side of the chamber. 4. The raw material dispersing means is constituted by a dispersion plate projected into the combustion chamber, and the insertion length and/or installation angle of the dispersion plate into the combustion chamber can be adjusted. - The raw material powder child heating device with a calcining furnace according to any one of Items 3 to 6.