JP2006264964A - Discharge device of high temperature powder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge device of high temperature powder, capable of continuous operation, by discharging a sediment including a mass material having the size of the major axis length of about 250 mm and composed of a powder and grain-like dust put in a high temperature state of the temperature of about 900 °C at a maximum and 300 °C or more at a minimum, so as not to have adverse influence on operation. <P>SOLUTION: A piping structure is formed in a crank shape in a side surface shape composed of a vertically formed inlet pipe, a horizontal pipe extended in the horizontal direction and a vertically formed outlet pipe; and is constituted in the dimensional relationship (LV>LH) of reducing the length LH up to the center of the outlet pipe from the tip of a pulse air jetting port to the length LV up to the center of the horizontal pipe from the upper end of the inlet pipe, by arranging the tip of the pulse air jetting port projected to an inlet pipe connecting side end part of the horizontal pipe in a position near a peripheral edge part on the outlet pipe side more than the center of the inlet pipe. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a high-temperature powder discharging apparatus for discharging dust including a lump that accumulates in a duct provided under a preheater of a cement clinker firing facility.

Conventionally, in the SP-type and NSP-type preheaters that are part of cement clinker firing equipment, the calcining furnace lower bleed inlet, the calcining furnace, and each cyclone are connected by ducts.
In these ducts, the accumulation of raw materials is partly caused by the flow of the extraction gas or the combustion gas sent from the kiln, but the raw materials and fuel combustion residue are attached to the wall surface before and after the calcining furnace and in the lower cyclone. And coated on the surface, after which they fall and fall into the duct and become deposited.
If the accumulation of these raw materials, fallen fallen objects, etc. from the wall surface becomes significant, it will cause a hindrance to ventilation and adversely affect the operation.

The raw material accumulated in the duct of the preheater system is in a very high temperature state of about 300 to 900 ° C., and is generally not discharged by a mechanical method during operation, and is not blown into a bin blow (trade name). As represented, it is often processed by an air blasting apparatus in which compressed air is instantaneously ejected from a nozzle to blow off deposits.
For this reason, for example, in the case where the major axis length is about 100 mm, and a large one having a large lump of about 250 mm is mixed, there is no force to blow off the large lump and is not subject to processing.

As a means for mechanically conveying such a high temperature raw material, it is conceivable to use a device such as a “water-cooled screw conveyor” (Patent Document 1) that has a proven record as a device for discharging falling dust from a boiler. However, there is no application example in a cement clinker firing facility for a mechanical discharge device such as this water-cooled screw conveyor.
In addition, even if considered as a general screw conveyor, it is expected that a trouble of biting will occur when targeting a granular material with clumps, which is optimal when considering trouble handling at high temperatures. It is hard to say that it is a simple discharge device.

If a trough-type chain conveyor is used as the same mechanical conveying means, it is expected that the chain will be stretched and worn out at high temperatures, and even if the shafts of the drive wheels etc. are all water-cooled, it is realistic. It is difficult to maintain and manage as much as a screw conveyor.
When an apparatus for handling such high-temperature dust was investigated from existing equipment, a “circulating fluidized bed boiler” (Patent Documents 2 and 3) that constitutes a combustion furnace provided with an L-type valve was found. This device is attached to the bottom of a boiler or fluidized bed, and has the capability of discharging even small small lumps. This L-type valve has been used for a long time as a device for discharging the falling dust of boilers. As a recent example of use, “Cement Clinker Firing Method and Firing Device” (Patent Document 4) includes a fluidized bed structure. There is a description as a discharge device for grains and firing furnace.
However, any of them is used as an apparatus for handling granular materials having a size of several to several millimeters, and has not been considered as an apparatus for a large lump.

JP 09-250730 A JP 03-282104 A JP 04-158101 Patent No. 2618836

[Problems of the prior art]
Some of the fallen fallen objects are very large, but most of them have a major axis length of 100 mm or less. If these accumulations become significant inside the duct, the conventional anti-deposition measures such as bin blow do not provide a sufficient discharge function, and eventually the effective cross-sectional area of the duct becomes narrow, causing ventilation inhibition and adversely affecting operations. It will be affected.
Considering that these deposits are discharged by a mechanical device that combines a rotary feeder (hereinafter abbreviated as RF) with a trough type chain conveyor (hereinafter referred to as TCC) or a screw conveyor (hereinafter abbreviated as SC). The temperature of the dust in the preheater duct varies depending on the location, but the maximum temperature is about 900 ° C, and the minimum temperature is over 300 ° C. Considering continuous operation at a certain level, it is very difficult in practice.
Furthermore, if processing of granular dust, which has a long axis length of about 100 mm, and a large one with a long axis length of about 250 mm, it is usually mixed with RF, TCC and SC Therefore, it is difficult to adopt it as a high-temperature material processing facility.

  The present invention has been made in view of the above-mentioned problems in the prior art, and the problem specifically set in order to solve this problem is that the raw material and the combustion residue adhere to the wall surface of the duct and are peeled off. Including a lump with a major axis length of about 250 mm and a deposit made of granular dust in a high temperature state at a maximum temperature of about 900 ° C. and at least over 300 ° C. Disclosed is a high-temperature powder discharge device that enables continuous operation for at least about half a year by discharging so that the effective cross-sectional area becomes narrow and does not adversely affect the operation due to the inhibition of ventilation.

For this reason, the present inventors pay attention to the L-type valve device which is attached to the bottom of a boiler or a fluidized bed and has the ability to discharge even a small amount of a lump. It was determined whether or not a lump having a length of about 250 mm could be discharged and could be used as a device capable of delivering a desired distance, and modification was made if necessary to solve this problem. In addition, powdered dust containing discharged mass is not simply discharged to the outside, but if possible, it should be re-introduced into a suitable place in the system and used effectively. Secondary masses such as preheater and cyclone clogging are prevented from occurring due to the contained mass.
That is, the problem solving means is configured as follows.

  As a specifically configured means that can effectively solve the above-mentioned problem, the first problem-solving means according to the high-temperature powder discharging apparatus of the present invention is extended in the horizontal direction with the vertically formed inlet pipe. In the piping structure in which the side surface shape formed of the horizontal pipe and the outlet pipe formed vertically is formed in a crank shape, the tip of the pulse air jet protruding from the end of the horizontal pipe on the inlet pipe connection side is It is arranged at a position closer to the peripheral edge on the outlet pipe side than the center of the inlet pipe, and the outlet pipe from the tip of the pulsed air outlet to the length LV from the upper end of the inlet pipe to the center of the horizontal pipe It is characterized by having a dimensional relationship (LV> LH) in which the length LH to the center of the wire becomes small.

The second problem solving means is characterized in that, in the first problem solving means, the relationship of the length LH to the length LV is such that LV> (1.5 × LH). To do.
Further, the third problem-solving means is any one of the first problem-solving means and the second problem-solving means, wherein an air pulse ejection time length is an air pressure of 0.4 MPa or more and a time length of 0. 0. It ejects at 8 seconds / pulse or more.
According to a fourth problem solving means, in any one of the first problem solving means to the third problem solving means, in addition to the pulse air ejection port, additional pulsed air is added to the intermediate position of the body portion of the horizontal pipe. A jet port is provided.
The fifth problem-solving means is the horizontal pipe in the case where a plurality of the additional pulsed air outlets are arranged at the same row position in any one of the first to fourth problem-solving means. It arrange | positions in the circumference equal position with respect to the cross section of this.
The sixth problem solving means is an apparatus for discharging high-temperature powder deposited in the duct of the cement baking apparatus according to any one of the first problem solving means to the fifth problem solving means. Out of the accumulated dust discharged from the outlet pipe of the furnace, the dust accumulated in the duct between the calcining furnace and the lowermost cyclone and the extraction duct to the calcining furnace is thrown into the kiln bottom sink and / or the lowermost stage The dust accumulated in each duct of the uppermost cyclone from the cyclone is put into a cyclone or a calcining furnace located in the lower part.

In the first problem-solving means according to the high-temperature powder discharging apparatus of the present invention, if the accumulated dust is filled in the inlet pipe and the horizontal pipe of the piping structure, the dust is discharged about a fixed amount. The ejected pulsed air does not empty the horizontal pipe, but the accumulated dust forms a layer in the axial direction in the horizontal pipe and is sequentially pushed out and discharged from the horizontal pipe to the outlet pipe.
Since the relationship between the length LV of the inlet pipe of the piping structure and the length LH of the horizontal pipe is set to LH <LV, when pulsed air is ejected, air is discharged from the upper part of the inlet pipe due to the weight of accumulated dust in the inlet pipe. It does not blow through and acts exclusively to push out the accumulated dust in the horizontal pipe, and discharges the accumulated dust to the outlet pipe. When a space corresponding to the amount discharged to the outlet pipe is created in the horizontal pipe, the air is released through the gap between the accumulated dust over time, and the pressure in the space decreases, supporting the weight of the accumulated dust in the inlet pipe. It becomes impossible to fill the space where the dust accumulated in the inlet pipe falls into the horizontal pipe.
If the pulsed air is jetted out when the space is filled, the accumulated dust is discharged to the outlet pipe as described above.

The amount of accumulated dust discharged is determined by the pulse air pressure and the pulse time (pulse air amount), so if the pressure of the pulse air is constant, there will be a gap between the dust dust discharge amount and the pulse time. A roughly proportional relationship can be seen.
Even if bricks that are mixed with accumulated dust and bricks as a substitute for lump can be discharged in the same way as with accumulated dust, the amount of discharge is greatly reduced because bricks become resistance. Ultimately, this can be dealt with by increasing the pulse air pressure and extending the pulse length.
As described above, a piping structure is manufactured at an appropriate ratio of LV and LH, or a structure in which an additional pulse air outlet is provided at the center of a horizontal pipe is used as a discharge device for deposits in a preheater duct. By using, the granular material dust containing a lump can be discharged | emitted stably. At this time, it is possible to prevent spilling on the inlet pipe side.

In the second problem-solving means, since the piping structure is configured to satisfy LV> (1.5 × LH), there is no spillage from the inlet pipe, and the accumulated dust is sequentially pushed out from the horizontal pipe. Drain to outlet pipe.
In the third problem solving means, it is possible to reliably deliver the accumulated dust in the discharge direction at 49 to 50 kg / pulse by ejecting at an air pressure of 0.4 MPa or more and a time length of 0.8 seconds / pulse or more. , Transport efficiency can be improved.

In the fourth problem solving means, it is necessary to configure the piping structure so as to satisfy LV> LH as a measure against the spilling of the basic inlet pipe, but the transport distance cannot be shortened due to the arrangement of the equipment. In order to maintain an appropriate ratio between the apparent LV and the LH by providing an additional air jet at the center of the horizontal pipe, preferably LV> (1.5 × LH) It is possible to surely take measures against blowing.
In the fifth problem-solving means, when a plurality of the additional pulsed air outlets are arranged at the same row position, the plurality of additional pulsed air outlets are arranged at equal circumferential positions with respect to the horizontal section of the horizontal pipe, so Without being biased, the accumulated dust can be discharged from the horizontal pipe to the outlet pipe in such a manner as to be sequentially pushed out so as to be uniform in the circumferential direction.

In the sixth problem solving means, the discharged accumulated dust is difficult to process because of the high temperature, but since the loss is large when discharged outside the system of the firing facility, it is processed by the method of returning it to the system. In this case, the dust accumulated in the duct between the calcining furnace and the lowermost cyclone and the bleed duct often includes a lump, and is therefore thrown into the kiln bottom sink for avoiding clogging problems after being thrown in. In consideration of the fact that the dust accumulated in the ducts of the lowermost cyclone to the uppermost cyclone has a relatively small amount of agglomerates, and the energy loss is smaller than that in the kiln bottom sink, the calcining furnace or appropriately To the correct cyclone.
Since the transport of the discharged dust is about 300 to 900 ° C., it is difficult to select an appropriate transport device, but it is not a transport device such as a general TCC or SC, but a bread or bucket. A structure such as a bread type conveyor using the above is desirably used.

Hereinafter, embodiments of the present invention will be specifically described.
This embodiment is specifically described for better understanding of the gist of the invention, and does not limit the description of the claims unless otherwise specified.

As shown in FIG. 1, L-shaped valves 12 are attached to the bleed duct 11 at the lower part of the furnace one by one in the axial direction of the duct for discharging accumulated dust, and the discharge-side end of the L-shaped valve 12 is pan-shaped. It is connected to the conveyor 13 so that the dust discharged to the furnace or cyclone can be returned.
As shown in FIGS. 2 and 3, the L-shaped valve 12 has the same pipe diameter (outer diameter) D of the inlet (vertical) pipe 12a, the horizontal pipe 12b, and the outlet pipe 12c, and 304.7 mm (SGP− 300A), the length (height) L1 of the inlet pipe 12a is 2000 mm, and the distance in the horizontal pipe 12b from the length L1 of the inlet pipe 12a to the tip of the pulsed air outlet 12d provided at the center of the horizontal pipe 12b Since the distance LV = L1 + LD2 obtained by adding LD2 = D / 2 is the distance LV from the upper end of the inlet pipe 12a to the center of the horizontal pipe 12b, the distance LV is 2153 mm.
Generally, the relationship is LV> L1.

Further, the length of the horizontal pipe 12b from the center of the inlet pipe to the center of the outlet pipe is L2 = 1333 mm (the length of the complete horizontal pipe portion is 1028.3 mm), and the pulsed air jet outlet 12d is a protruding length from the mounting portion 12e. The length is set to L3 = 250 mm, and the tip is disposed at a position closer to the outlet pipe by a distance L4 = 100 mm from the center of the inlet pipe.
The distance LH from the tip of the pulse air outlet 12d as the effective horizontal distance to the center of the outlet pipe is LH = L2−L4 = 1233 mm.
In general, in order to prevent blow-off from the upper end of the inlet pipe, the ratio of the length of the inlet (vertical) pipe 12a and the horizontal pipe 12b is such that 1.5 × LH <LV. Preferably formed.
The tube diameter of the L-shaped bulb 12 is set to about 300 mm, which is set as a size that can be discharged on the basis of a long axis length of about 250 mm (a long axis length of 230 mm when brick is used as an alternative to a lump). It is a thing.

The tip of the pulse air outlet 12d is used as an outlet having a pipe diameter of 16.1 mm (SGP-15A) set at the center of the inlet pipe, and the pulsed air is jetted with an appropriate pressure and time.
By ejecting pulsed air at the set pressure and time, the accumulated dust in the horizontal pipe 12b of the L-shaped valve 12 is pushed out toward the outlet pipe 12c.
The pipe diameter of each pipe is set to about 300 mm because the pipe diameter is set to a size that can be discharged on the basis of the long axis length of the lump of about 250 mm (in the case of brick, the long axis length is 230 mm). is there.
As the set pressure of the pulsed air, two levels of 0.58 MPa and 0.40 MPa were set.
The pulse length (time per pulse) was set at four levels of 0.2 seconds / pulse, 0.4 seconds / pulse, 0.8 seconds / pulse, and 1.2 seconds / pulse.

The discharged particulate dust is difficult to process because of the high temperature. However, since the loss is large when discharging the firing equipment out of the system, it is processed by returning it to the system.
The dust accumulated in the duct (not shown) between the calciner and the lowermost cyclone and the bleed duct 11 often includes agglomerates, so it is thrown into the kiln bottom sink in order to avoid clogging problems after being thrown in. To do. In addition, considering that the accumulated dust in the ducts (not shown) of the lowermost cyclone to the uppermost cyclone is relatively less agglomerated, the calcining is smaller in energy loss than that in the kiln bottom sink. Place in furnace or appropriate cyclone.
Since the transport of the discharged dust is about 300 to 900 ° C., it is difficult to select an appropriate transport device, but it is not a transport device such as a general TCC or SC, but a bread or bucket. The thing of the structure like the bread type | mold conveyor 13 using such things is desirable.

[Emission test]
In the test to confirm the discharge performance, the target was (1) sandy cement clinker currently deposited in the bleed duct and coating material (most of the lump is one whose maximum long axis length is 100mm or less). Two types were used: a mixture, and (2) current sediment (the above (1)) + schmod-type parallel brick.
A mixture of sandy cement clinker (maximum diameter of several mm) and coating material having a maximum major axis length of about 100 mm (currently deposited in the bleed duct) was prepared as the particulate dust to be deposited.
In addition, a chamotte-type parallel brick 16 (dimensions 230 mm × 114 mm × 65 mm, weight 3.4 kg) was prepared as an alternative to a block having a maximum long axis length of about 250 mm (see FIGS. 4 and 6).
Since the tip of the pulse air jet outlet is disposed at a position closer to the outlet pipe by a distance L4 = 100 mm from the central part of the inlet pipe, the pulsed air is ejected from the upper end of the inlet pipe 12a when ejected with an appropriate pressure and time. The accumulated dust is carried out to the outlet pipe 12c side without blowing down.

An L-type valve 22 shown in FIGS. 5 and 6 was tested as an example of an apparatus for comparing the discharge performance with the example.
As the L-type valve 22 of this comparative example, LV (1144 mm) <LH (2002 mm) and the horizontal pipe 22b is longer than the inlet pipe 22a. The pulse air jet port 22d is provided so that its tip is positioned below the outer surface of the inlet tube 22a and the surface opposite to the outlet tube 22c.
For this reason, the ratio of the lengths of the inlet pipe 22a and the horizontal pipe 22b is (LV × 2) ≈LH, which is greatly different from the L-type valve 12 of the first embodiment.
From this, when the pulsed air was ejected, a part of the ejected pulsed air was blown out from the upper part of the inlet pipe 22a and was blown down together with the accumulated dust in the inlet pipe 22a. When the pressure of the pulsed air was increased, the amount of blown out increased.

The results of the discharge test on the L-type valve 12 of Example 1 are shown in FIG.
As a result, the amount of accumulated dust discharged is determined by the pulsed air pressure and the pulse time (pulsed air amount). If the pulsed air pressure is constant, the amount of accumulated dust discharged is roughly between the pulsed time. A proportional relationship is seen.
Further, when the pressure of the pulsed air rises or falls, the relationship between the amount of accumulated dust discharged and the pulse time can be grasped in such a way that the proportional relationship moves in parallel.
The capacity of discharging the accumulated dust in the L-shaped valve 12 is about 2.4 t / hour when the pulse air pressure is 0.4 MPa, the pulse length is 0.4 seconds / pulse, and 1 pulse / minute.

Next, the same test was performed on the mixed dust mixed with brick 16.
In the case of the L-type valve 22 in which the brick 16 is mixed with the accumulated dust, the brick 16 may become a resistance, or may be present in the vicinity of 1.5 m from the inlet side in the horizontal pipe 22b, and the pulsed air pressure may be 0.58 MPa. Even if the pulse length was increased to 1.2 seconds, it could not be discharged. At the same time, when the pulsed air pressure is increased, the spilling from the upper end of the inlet pipe 22a greatly increases.
Compared to this, in the case of the L-shaped valve 12, there is no blown-off from the upper end of the inlet pipe 12a, and the transport of the accumulated dust continues. Never became.

[Effects of Example 1]
In the L-shaped valve 12, if the inlet pipe 12 a and the horizontal pipe 12 b are filled with granular dust, the dust is discharged about a certain amount by the jetted pulse air. The discharge of the pulsed air does not empty the horizontal pipe 12b, but the dust particles form a layer in the axial direction in the horizontal pipe 12b and are sequentially pushed out and discharged from the horizontal pipe 12b to the outlet pipe 12c. Is done.
Since the relationship between LV and LH of the L-type valve 12 is set to 1.5 × LH <LV, when the pulsed air is ejected, the air ejected from the upper part of the inlet pipe is blown out by the weight of the particulate dust in the inlet pipe In such a case, the dust particles act exclusively to extrude the dust particles in the horizontal tube, and the dust particles are discharged to the outlet tube 12c. When a space corresponding to the amount discharged to the outlet pipe 12c is generated in the horizontal pipe, the air blows out through the gap between the granular dusts over time, and the pressure in the space portion decreases, and the powder in the inlet pipe 12a decreases. It becomes impossible to support the weight of the granular dust, and fills the space formed by the granular granular dust in the inlet pipe 12a falling into the horizontal pipe 12b. When the pulsed air is ejected at the time when the space is filled, the particulate dust is discharged to the outlet pipe as described above.

The discharge amount of the particulate dust is determined by the pulse air pressure and the pulse time (pulse air amount). If the pressure of the pulsed air is constant, a roughly proportional relationship is observed between the amount of discharged particulate dust and the pulse time.
Although it is possible to discharge bricks mixed with granular dust as well as granular dust only, the amount of discharge is greatly reduced because bricks become resistance. Eventually, this can be dealt with by increasing the pulse air pressure and extending the pulse length, but the possibility of spilling into the inlet pipe 12a increases.
Although it is necessary to satisfy at least LV> LH as a measure against the basic blow-off to the inlet pipe 12a, it is configured to satisfy LV> (1.5 × LH) in order to eliminate blow-off. It is desirable.
As described above, the L-shaped valve 12 is set with an appropriate ratio of the length of the inlet pipe 12a and the horizontal pipe 12b, so that the particulate dust can be discharged stably.
The accumulated dust discharged by the L-type valve 12 is returned to the baking apparatus from the lower part of the preheater inlet housing portion using the pan-type conveyor 13 to be effectively commercialized.

As described above, it is necessary to make LV> (1.5 × LH) as a countermeasure against spilling to the inlet pipe. However, it is conceivable that the transport distance cannot be shortened from the viewpoint of the arrangement of the equipment. In such a case, the ratio of the apparent LV to LH can be maintained at an appropriate ratio by providing the additional pulsed air jets 32f and 32f at the center of the horizontal pipe 32b of the L-shaped valve 32. Like that.
As shown in FIGS. 8 and 9, the L-type valve 32 is provided with two additional pulsed air jets 32f and 32f at two axially symmetrical positions at the axial center of the horizontal pipe 32b. It is formed similarly.
In this case, if the length of the horizontal pipe 32b before the additional pulse air jets 32f and 32f are provided is L2 = 2000 mm, the distance LH2 from the tip of the pulse air jet 32d to the center of the outlet pipe 32c. Is 1900 mm, but the additional pulsed air outlets 32f and 32f are arranged such that the distance LH from the tip of the pulsed air outlet 32d is 1233 mm and provided with an opening angle of 30 ° with respect to the axial direction. LV> (1.5 × LH).
One L-type valve 32 was attached to the bleed duct at the bottom of the furnace for discharging accumulated dust.

In addition to the normal air outlet provided on the inlet side of the L-shaped valve, in an apparatus having a structure in which an air outlet is provided between the inlet portion and the outlet portion, an additional air outlet is desirably required. Accordingly, about 1 to 4 are provided in the body portion of the L-type valve 32, and preferably, additional air outlets are provided in the body portion of the L-type valve 32 at left and right or up and down positions.
And the lump which is contained in the deposit in a duct is made to process the dust containing a thing with a major axis length of about 10-250 mm.
The normal pulsed air outlet 32d of the L-shaped valve 32 and the additional pulsed air outlets 32f and 32f can be ejected at the same time or by appropriately shifting the time, and a lump contained in the deposit in the duct is formed. , So that dust in a ratio of about 1 to 40% by weight can be treated.
The L-type valve 32 is used to discharge the accumulated dust and the like of the cement firing preheater duct including the extraction duct and send it to the kiln bottom sink, the calciner, and an appropriate cyclone.
When discharging the deposit in the duct, the transport distance from the center of the inlet of the L-shaped valve 32 to the center of the outlet may have a long transport distance exceeding 1 m in the horizontal distance.
When the L-type valve 32 is used to discharge the accumulated dust and the like of the cement firing preheater duct including the extraction duct, and the deposit in the duct is discharged, the conveyance distance from the center of the L-type valve 32 to the center of the outlet Shall be sent over a horizontal distance of more than 1 m to the kiln bottom sink, calciner and appropriate cyclone.

[Effects of Example 2]
With this configuration, the discharge state of accumulated dust was confirmed by simultaneously ejecting pulse air from the pulse air ejection port 32d and the additional pulse air ejection ports 32f and 32f.
By ejecting the jet air at a pressure of 0.04 MPa, a pulse length of 0.4 seconds, and 1 pulse / minute, the accumulated dust can be discharged stably. At this time, no blow-off occurred on the inlet pipe 32a side.
Further, in the L-shaped valve 32, when the state of discharging the accumulated dust mixed with the brick 16 was confirmed, the dust could be discharged smoothly.

Furthermore, the pulsed air may be ejected at an appropriate time difference, even if the existing and the additional are simultaneously ejected.
The L-type valve 32 is used as a discharge device for deposits in the preheater duct.
By providing the additional pulsed air outlets 32f and 32f at the center of the horizontal pipe 32b of the L-shaped valve 32, the amount and pressure of air from the existing pulsed air outlet 32d can be reduced, and the inlet pipe is ejected when the pulsed air is ejected. Blowing from the upper end of 32a no longer occurs.

The dust that accumulates at this site is sand-like fine dust from the cement clinker that has been blown up from the cement clinker cooler. I'm still. In the coating lump, a large one of about 250 mm may be mixed.
By providing the additional pulsed air outlets 32f and 32f at the center of the horizontal pipe 32b of the L-shaped valve 32, the accumulated dust in the duct is discharged smoothly. Even if lump is mixed in the accumulated dust, it can be discharged without increasing the pressure of the blown air.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the state which attached the L-shaped valve | bulb of Example 1 in the extraction duct of the calcining furnace lower part in the discharge device of the high temperature powder of this invention, (A) is the extraction duct provided with the discharge device of the high temperature powder. It is a partial cross section side view which shows this, (B) The partial cross section rear view which shows a bleed duct same as the above. It is side surface explanatory drawing which shows the outline | summary of a L-type valve same as the above. It is side surface explanatory drawing which shows the behavior of dust when normal accumulation dust is thrown into the L-type valve | bulb same as the above, and the discharge experiment was conducted. It is side surface explanatory drawing which shows the behavior of dust when throwing a normal accumulation dust and a parallel brick into an L-type valve same as the above, and performing the discharge experiment. It is side surface explanatory drawing which shows the behavior of dust when the normal accumulation dust is thrown in and the discharge experiment is done about the comparative example of the L-shaped valve. It is side surface explanatory drawing which shows the behavior of dust when a normal piled-up dust and a parallel brick are thrown in, and the discharge experiment is done about the comparative example of the same L-type valve | bulb. It is a graph which showed the change of the amount of dust discharge at the time of changing the air pressure to eject and the ejection time per time in the L type valve same as the above. It is side surface explanatory drawing which shows the L-type valve | bulb which has the structure which added the jet nozzle to the horizontal pipe | tube center part of Example 2 in the discharge device of the high temperature powder of this invention. It is a plane explanatory view showing the L type valve of Example 2 same as the above.

Explanation of symbols

11 Extraction ducts 12, 22, 32 L-type valves 12a, 22a, 32a Inlet pipes 12b, 22b, 32b Horizontal pipes 12c, 22c, 32c Outlet pipes 12d, 22d, 32d Pulsed air outlets 12e, 22e, 32e Mounting portion 13 ( Pan type) Conveyor 16 Standard brick 32f Additional pulse air outlet

Claims (6)

In the piping structure in which the side surface shape formed of the vertically formed inlet pipe, the horizontal pipe extending in the horizontal direction, and the vertically formed outlet pipe is formed in a crank shape,
The tip of the pulsed air outlet projecting from the end of the horizontal pipe on the inlet pipe connection side is disposed at a position closer to the peripheral edge on the outlet pipe side than the center of the inlet pipe, and from the upper end of the inlet pipe A high-temperature powder characterized by having a dimensional relationship (LV> LH) in which the length LH from the tip of the pulse air outlet to the center of the outlet tube becomes smaller than the length LV to the center of the horizontal tube. Discharge device.   The high-temperature powder discharging apparatus according to claim 1, wherein a relationship of the length LH with respect to the length LV is such that LV> (1.5 × LH).   The high-temperature powder discharging apparatus according to claim 1 or 2, wherein the air pulse is ejected at an air pressure of 0.4 MPa or more and at a time length of 0.8 seconds / pulse or more.   The high-temperature powder discharging apparatus according to any one of claims 1 to 3, wherein, in addition to the pulse air outlet, an additional pulse air outlet is provided at an intermediate position of the body portion of the horizontal pipe.   5. When the plurality of additional pulsed air outlets are arranged at the same row position, they are arranged at a circumferentially uniform position with respect to a transverse section of the horizontal pipe. 6. High temperature powder discharge device. A device that discharges high-temperature powder deposited in the duct of a cement firing device,
Of the accumulated dust discharged from the outlet pipe of this discharge device, the dust accumulated in the duct between the calcining furnace and the lowermost cyclone and the bleed duct to the calcining furnace is thrown into the kiln bottom sink, and / or Alternatively, the dust accumulated in each duct of the uppermost cyclone from the lowermost cyclone is charged into a cyclone or a calcining furnace located in the lower part, and discharge of the high-temperature powder according to any one of claims 1 to 5 apparatus.

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