JP7420627B2 - Cooling air introduction device, chlorine bypass equipment, cement clinker manufacturing equipment, and cement clinker manufacturing method - Google Patents

Description

The present disclosure relates to a cooling air introduction device, a chlorine bypass facility, a cement clinker production facility, and a method for producing cement clinker.

A wide variety of wastes are processed in cement clinker production facilities. In recent years, as the amount of waste processed has increased, the amount of volatile components such as chlorine and sulfur input into cement kilns has increased. These volatile components become a factor that adheres to the production equipment and forms a coating, which affects the operation of the cement clinker production equipment. For this reason, many cement clinker production facilities are equipped with chlorine bypass equipment to reduce volatile components.

Various techniques have been studied to suppress dust accumulation and coating in the bleed pipes of chlorine bypass equipment. For example, Patent Document 1 proposes protecting the inner wall of an air bleed pipe with an air curtain created by a reverse flow of a swirling flow of cooling air, and suppressing the occurrence of coating. In order to adjust the backflow, it has been proposed to provide a mechanism for varying the inlet cross-sectional area of the inlet, such as a slide gate type. Patent Document 2 discloses a dust removal method in which dust accumulated in the bleed duct is removed by ejecting a swirling flow of gas along the inner wall of the bleed duct from the downstream side of the bleed gas toward the exhaust duct side. It has been proposed to provide a nozzle.

Japanese Patent Application Publication No. 9-175847 Japanese Patent Application Publication No. 2010-126410

As in Patent Document 1, changing the blowing position by changing the flow rate of the cooling air that protects the inner wall of the bleed pipe depending on the insertion amount of the slide gate suppresses dust accumulation and coating in the bleed pipe of the chlorine bypass. It is considered to be effective for However, if a slide gate type mechanism is provided as in Patent Document 1, there is a concern that the device will become larger. There is also a concern that the movable parts and sliding parts will become larger, making it difficult to maintain airtightness. Further, in the technique of inserting and arranging the dust removal nozzle into the air bleed pipe as in Patent Document 2, there is a concern that dust is likely to accumulate near the dust removal nozzle.

Therefore, the present disclosure provides a cooling air introduction device that can reduce the accumulation and adhesion of dust in an air bleed pipe and stabilize the operation of a chlorine bypass facility. Furthermore, by including such a cooling air introduction device, a chlorine bypass facility and a cement clinker manufacturing facility that can be stably operated are provided. The present invention also provides a method for producing cement clinker that can stably produce cement clinker.

A cooling air introduction device according to one aspect of the present disclosure is a cooling air introduction device that introduces cooling gas along the circumferential direction of the side surface of an air bleed pipe of a chlorine bypass facility, and the cooling air introduction device It is equipped with a wind direction adjustment section that adjusts the direction of the cooling air by changing the direction of introduction. Since this cooling air introduction device includes a wind direction adjustment section, it is possible to adjust the wind direction of the cooling gas to the bleed pipe according to the dust accumulation state in the bleed pipe and the operating state of the cement kiln. Therefore, it is possible to reduce the accumulation and adhesion of dust in the bleed pipe and to suppress heat loss due to cooling air flowing into the kiln. Further, the amount of suction of raw material dust can be reduced, and kiln exhaust gas containing volatile components can be efficiently extracted. Therefore, the operation of the chlorine bypass equipment and the cement clinker manufacturing equipment can be stabilized.

It is preferable that the wind direction adjustment section has a shaft body and a member rotatably or swingably attached to the shaft body. Thereby, the direction in which cooling air is introduced into the bleed pipe can be adjusted with a high degree of freedom. Therefore, the operation of the chlorine bypass equipment can be further stabilized.

Preferably, the wind direction adjustment section includes at least one of a plate-like member and a deformable channel wall. This makes it possible to adjust the direction of cooling air introduced into the bleed pipe with a simple device configuration.

The above-mentioned cooling air introduction device includes a measurement unit that measures operating information of at least one selected from an air extraction pipe, a rising duct with which the air extraction pipe communicates, a cement kiln, and a kiln bottom, and It is preferable to have a control section that outputs a control signal for adjusting the direction of the cooling air to the wind direction adjustment section. Thereby, the direction in which the cooling air is introduced into the bleed pipe can be adjusted depending on the operating conditions of the chlorine bypass equipment and the cement kiln. Therefore, the operation of the chlorine bypass equipment can be further stabilized.

A chlorine bypass facility according to one aspect of the present disclosure includes any of the cooling air introduction devices described above. Since the cooling air introduction device includes a wind direction adjustment section, it is possible to adjust the direction in which the cooling air is introduced into the air bleed pipe depending on the dust accumulation state in the air bleed pipe and the operating state of the cement kiln. Therefore, it is possible to reduce the accumulation and adhesion of dust in the bleed pipe and to suppress heat loss due to cooling air flowing into the kiln. Further, the amount of suction of raw material dust can be reduced, and kiln exhaust gas containing volatile components can be efficiently extracted. Therefore, the chlorine bypass equipment and the cement clinker production equipment can be stably operated.

Cement clinker production equipment according to one aspect of the present disclosure includes a preheating calcining section, a cement kiln, a rising duct, and a chlorine bypass facility connected to the rising duct and/or the kiln bottom of the cement kiln. The equipment is equipped with any of the cooling air introduction devices described above. Since this cement clinker manufacturing equipment is equipped with one of the above-mentioned cooling air introduction devices, the direction in which the cooling air is introduced into the air bleed pipe is determined depending on the state of dust accumulation in the air bleed pipe and the operating status of the cement kiln. Can be adjusted. Therefore, it is possible to reduce the accumulation and adhesion of dust in the bleed pipe, and to suppress heat loss due to cooling air flowing into the kiln. Further, the amount of suction of raw material dust can be reduced, and kiln exhaust gas containing volatile components can be efficiently extracted. Therefore, the cement clinker manufacturing equipment can be stably operated.

A method for producing cement clinker according to one aspect of the present disclosure includes a preheating and calcination step of preheating and calcining a cement raw material, and a firing step of producing cement clinker by firing the preheated and calcined cement raw material. A cooling process in which cooling air is introduced along the circumferential direction of the side surface of the bleed pipe of the chlorine bypass equipment to cool the bleed gas extracted by the bleed pipe. The direction of the cooling air is adjusted by changing the direction of the cooling air to cool the bleed gas.

In this manufacturing method, in the cooling process in which the direction of the cooling air that cools the bleed gas is adjusted, the direction of the cooling air is adjusted according to the accumulation and adhesion of dust in the bleed pipe and the operating status of the cement kiln. I can do it. Therefore, the accumulation and adhesion of dust in the bleed pipe can be efficiently reduced, and the cooling process and firing process can be stabilized. Further, the amount of suction of raw material dust can be reduced, and kiln exhaust gas containing volatile components can be efficiently extracted. Therefore, cement clinker can be stably produced.

According to the present disclosure, it is possible to reduce the accumulation and adhesion of dust in the bleed pipe and to suppress heat loss due to the inflow of cooling air into the kiln, and it is possible to control the operation of chlorine bypass equipment and cement clinker production equipment. A cooling air introduction device capable of stabilizing operation can be provided. Moreover, by providing such a cooling air introduction device, it is possible to provide a chlorine bypass facility and a cement clinker manufacturing facility that can be stably operated. Further, it is possible to provide a method for producing cement clinker that can stably produce cement clinker.

It is a figure showing an outline of chlorine bypass equipment concerning one embodiment. FIG. 3 is an enlarged view showing the vicinity of the connection between the air bleed pipe and the cooling air introduction device. (A) and (B) are diagrams showing an example of a wind direction adjustment section having a shaft body and a member rotatably or swingably attached to the shaft body. It is a figure which shows another example of the wind direction adjustment part which has a shaft body and a member rotatably or swingably attached to the shaft body. (A) and (B) are diagrams showing still another example of the wind direction adjustment section. It is a figure which shows the modification of chlorine bypass equipment. It is a figure showing another modification of chlorine bypass equipment. 8 is a sectional view taken along line VIII-VIII in FIG. 7. FIG. (A) and (B) are diagrams showing examples of chambers provided in chlorine bypass equipment. (A) and (B) are diagrams showing another example of a chamber provided in a chlorine bypass facility. It is a diagram showing cement clinker production equipment according to one embodiment.

Hereinafter, one embodiment of the present disclosure will be described with reference to the drawings as the case may be. However, the following embodiments are examples for explaining the present disclosure, and are not intended to limit the present disclosure to the following contents. In the description, the same reference numerals will be used for the same elements or elements having the same function, and redundant description will be omitted in some cases. In addition, the positional relationships such as top, bottom, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Furthermore, the dimensional ratio of each element is not limited to the ratio shown in the drawings.

FIG. 1 is a diagram schematically showing a chlorine bypass facility 100 according to an embodiment. The chlorine bypass equipment 100 is installed in a cement clinker manufacturing equipment 200 that includes a cement kiln 50, a kiln bottom 52, and a rising duct 51, and extracts the kiln exhaust gas containing volatile components such as chlorine generated during the manufacturing of cement clinker to extract cement clinker. Volatile components such as chlorine in the manufacturing equipment 200 are reduced.

The chlorine bypass equipment 100 extracts kiln exhaust gas from the rising duct 51 and/or the kiln tail 52 of the cement kiln 50, and mixes cooling gas with the extracted kiln exhaust gas to obtain extracted gas containing the kiln exhaust gas and cooling gas. A trachea 12, a chamber 20 that separates lumpy dust contained in the bleed gas from the bleed pipe 12, and a heat exchanger 25 that cools the bleed gas from which the lumpy dust has been separated to below the melting point of the volatile alkali salt. The extracted gas is passed through a dust collector 26 that separates dust (chlorine bypass dust) contained in the extracted gas that is precipitated during cooling from the extracted gas, a chamber 20, a heat exchanger 25, and a dust collector 26. It also includes a suction fan 28 that extracts air. The bleed pipe 12 may be referred to as a bleed probe. Examples of the suction fan 28 include ordinary suction fans such as a sirocco fan and a turbo fan.

The chlorine bypass facility 100 includes a cooling air introduction device 10 that introduces cooling gas into the extraction pipe 12, and an introduction fan 14 that supplies cooling gas to the cooling air introduction device 10. The cooling gas constituting the cooling air may be air at room temperature, or may include exhaust gas generated in a factory or the like. Exhaust gases include, for example, odor gases generated during the reception, storage, and fermentation of water-containing sludge such as sewage sludge brought into a cement manufacturing factory, and exhaust gases emitted from the suction fan 28 and suction fans of other processes. It will be done.

The bleed pipe 12 may be inclined with respect to the horizontal direction, as shown in FIG. 1, or may be horizontal. From the viewpoint of suppressing the accumulation of dust in the air bleed pipe 12, when the rising duct 51 side (the kiln bottom 52 side) of the air bleed pipe 12 is defined as the upstream side, and the chamber 20 side is defined as the downstream side, It is preferable that the slope is higher than the other side. Thereby, dust including raw material dust can be returned to the rising duct 51 or the kiln bottom 52 by the swirling flow and gravity. The angle of inclination may be, for example, 20 to 70° with respect to the horizontal plane.

FIG. 2 is an enlarged view showing the vicinity of the connection between the air bleed pipe 12 and the cooling air introduction device 10. The kiln exhaust gas 60 contains dust as a solid content along with gaseous volatile components at the bleed port 12a, which is the inlet of the bleed pipe 12. This dust may also include raw material dust that becomes cement clinker. The cooling air introduction device 10 is connected to the air bleed pipe 12 so as to extend in the tangential direction of the side surface 13 of the circular air bleed pipe 12 . The cooling gas 62 introduced from the cooling air introduction device 10 is introduced along the circumferential direction of the side surface 13 of the bleed pipe 12 . As a result, an air curtain is formed on the inner wall surface of the bleed pipe 12 by the swirling flow of the cooling gas 62, and the inner wall surface of the bleed pipe 12 is protected from the high temperature kiln exhaust gas 60.

The cooling gas 62 introduced from the cooling air introduction device 10 along the circumferential direction of the side surface 13 of the bleed pipe 12 and the kiln exhaust gas 60 that has flowed into the bleed pipe 12 from the bleed port 12a become a mixed gas and pass through the bleed pipe. 12 to form swirling flows SF1 and SF2. The rotational axes of the swirling flows SF1 and SF2 and the central axis of the bleed pipe 12 having a circular tube shape substantially coincide with each other. The mixed gas moves along the longitudinal direction of the bleed pipe 12 while swirling inside the bleed pipe 12 .

The cooling air introduction device 10 has a wind direction adjusting section 11 at its tip portion that adjusts the wind direction by changing the direction in which the cooling gas 62 is introduced. For example, if the introduction of the cooling gas 62 is continued so that the swirling flow SF1 is formed, dust may accumulate on the upstream side of the bleed pipe 12 (on the rising duct 51 side). In this case, if the wind direction adjustment unit 11 changes the introduction direction of the cooling gas 62 to the upstream side of the bleed pipe 12 and adjusts the direction of the cooling air, a swirling flow SF2 is formed. Thereby, dust deposited on the upstream side of the bleed pipe 12 can be removed by the swirling flow SF2. The dust deposited on the upstream side of the bleed pipe 12 may be returned to the rising duct 51 (kiln bottom 52) by the swirling flow SF2, or may be guided to the downstream side of the bleed pipe 12.

The dust that accumulates on the upstream side of the air bleed pipe 12, that is, near the air bleed port 12a, may have a higher content of raw material dust that becomes cement clinker than volatile components. By returning dust including such raw material dust into the rising duct 51 (kiln tail 52), the amount of chlorine bypass dust can be reduced and the yield of cement clinker can be increased.

It is preferable that the amount of cooling gas (or mixed gas of cooling gas and kiln exhaust gas) introduced into the bleed pipe 12 flowing into the rising duct 51 (kiln tail 52) is small. Thereby, heat loss can be suppressed. Therefore, for example, when the amount of kiln exhaust gas generated decreases due to factors such as changes in cement raw materials, and the amount of cooling gas or mixed gas flowing from the bleed pipe 12 to the rising duct 51 (kiln bottom 52) increases. The direction of introduction of the cooling gas 62 may be adjusted to the downstream side of the bleed pipe 12 by the wind direction adjustment unit 11. Thereby, heat loss in the preheater, calciner, etc. can be reduced.

The wind direction adjustment unit 11 provided in the cooling air introduction device 10 may include a shaft body and a member rotatably or swingably attached to the shaft body. Such a wind direction adjustment section 11 can greatly change the direction in which the cooling gas is introduced. Therefore, the direction of the cooling air to the bleed pipe can be adjusted with a high degree of freedom. Therefore, the operation of the chlorine bypass facility 100 can be further stabilized.

FIGS. 3 and 4 show an example of a wind direction adjusting section having a shaft body and a member rotatably or swingably attached to the shaft body. 11 A of wind direction adjustment parts of FIG. 3(A) have the shaft body 30 and the plate-shaped member 32 rotatably or rockably attached to this. Since such a wind direction adjustment section 11A can reduce pressure loss, the degree of freedom in adjusting the air volume of the cooling gas 62 can be increased. The plate member 32 may be, for example, a fin.

The wind direction adjustment section 11B in FIG. 3(B) includes a shaft body 30 and a cylindrical member 33 rotatably or swingably attached to the shaft body 30. Such a wind direction adjustment section 11B can adjust the direction of the cooling air with high precision. Therefore, it becomes possible to precisely control the operating state of the air bleed pipe 12, and the chlorine bypass equipment 100 and the cement clinker production equipment 200 can be operated even more stably. The cylindrical member 33 may have one or more cylindrical wind direction adjusting bodies concentrically provided in the central portion 33a.

The wind direction adjustment section 11C in FIG. 4 includes a shaft body 30 and a gate member 35 rotatably or swingably attached to the shaft body 30. The gate member 35 has a function of narrowing the flow path of the cooling gas 62 and changing the introduction direction of the cooling gas 62 to adjust the direction of the cooling air. Therefore, not only the direction of the cooling air but also the speed of the cooling air can be controlled. The shape of the gate member 35 is not particularly limited, and any shape that can restrict the flow path of the cooling gas 62 and adjust the direction of the cooling air can be used as appropriate. For example, it may be a ball-shaped member used in the valve body of a normal ball valve.

The wind direction adjustment section 11 is not limited to the above-mentioned example. For example, the wind direction adjustment section 11D may have a deformable channel wall as shown in FIG. 5(A), or the wind direction adjustment section may have a removable plate member as shown in FIG. 5(B). 11E may be used. The flow path wall of the wind direction adjustment section 11D may be formed of a bellows-like member, or may be formed of a hose-like member, for example. The wind direction adjustment part 11E can direct the cooling air to the upstream side of the air bleed pipe 12 if the pair of plate-like members 11a are inserted therein. On the other hand, by removing the pair of plate members 11a and inserting the pair of plate members 11b instead, the direction of the cooling air can be changed to the downstream side of the bleed pipe 12. The wind direction adjustment section 11 may be, for example, of a punker louver type or a wave louver type.

In addition to the wind direction adjustment section 11, the cooling air introduction device 10 may include a flow speed adjustment section such as a damper that controls the flow speed of the cooling gas. Thereby, the amount of cooling gas introduced can be appropriately adjusted in accordance with not only the wind direction but also the operating condition of the cement kiln 50, the concentration of dust in the kiln exhaust gas, the amount of extracted air from the kiln exhaust gas, and the like.

The wind direction of the cooling air is adjusted by the wind direction adjustment unit 11 (11A to 11E), for example, by a measurement unit that measures operating information of the air bleed pipe 12, or the rising duct 51, cement kiln 50, or kiln bottom 52 that the air bleed pipe 12 communicates with. You may do so based on For example, based on the operation information of the air bleed pipe, an operator may manually adjust the wind direction using the wind direction adjustment section 11 (11A to 11E), or it may be performed automatically using the control section. In this case, it is preferable that the chlorine bypass equipment 100 includes a measurement unit that measures operation information of at least one of the air bleed pipe 12, the rising duct 51, the cement kiln 50, and the kiln bottom 52.

The operational information measured by the measurement unit includes temperature, pressure, gas components, gas flow rate, dust concentration, images, and the like. Specifically, the temperature inside or on the surface of the bleed pipe 12, the temperature of the kiln exhaust gas in the rising duct 51 or the kiln butt 52, the temperature of the kiln exhaust gas flowing into the bleed pipe 12, the pressure of the kiln exhaust gas or the bleed gas, and the temperature of the kiln exhaust gas in the rising duct 51 or the kiln bottom 52. Examples include gas components of the exhaust gas or bleed gas, dust concentration contained in the kiln exhaust gas or bleed gas, and images of the inside of the bleed pipe 12. Examples of the measurement unit include a temperature sensor, a pressure sensor, a gas component sensor, a flow rate sensor, and a camera.

The chlorine bypass equipment 100 may include a control unit that outputs a control signal for adjusting the direction of the cooling air to the wind direction adjustment unit 11 based on the operation information measured by the measurement unit. The control unit may be a normal computer system, and may include, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input/output interface, and the like.

By providing the control section, the wind direction adjustment section 11 can automatically control the direction of the cooling air. For example, when the temperature T1 near the air bleed port 12a of the air bleed pipe 12 is measured by the measurement unit, and the temperature T1 is below the lower limit, the air direction adjustment unit 11 changes the direction of the cooling air toward the downstream side of the air bleed pipe 12. change. Thereby, it is possible to suppress the cooling air from flowing into the rising duct 51 (kiln bottom 52). On the other hand, when the temperature T1 exceeds the upper limit, the wind direction adjustment section 11 changes the direction of the cooling air to the upstream side of the bleed pipe 12. Thereby, the amount of dust carried into the bleed pipe 12 along with the kiln exhaust gas can be reduced.

FIG. 6 is a diagram showing a modification of the chlorine bypass equipment. This modification promotes the formation of a swirling flow inside the bleed pipe 12 from the end 12b of the bleed pipe 12 opposite to the bleed port 12a, and also promotes the progression of the swirl flow along the longitudinal direction of the bleed pipe 12. This embodiment differs from the above embodiment in that an inner cylinder body 40 that guides the direction is inserted. When viewed along the longitudinal direction of the bleed pipe 12, the tip 40a of the inner cylindrical body 40 is connected to the bleed port 12a, which is the inlet of the kiln exhaust gas into the bleed pipe 12, and the connection between the bleed pipe 12 and the cooling air introduction device 10. located between the sections. As a result, the swirling flow generated by the cooling air introduced from the cooling air introduction device 10 once heads toward the bleed port 12a, and then flows into the inner cylinder 40 from the tip 40a of the inner cylinder 40, and flows into the inner cylinder 40. It flows downstream of the body 40. Thereby, accumulation of dust on the inner wall of the bleed pipe 12 and the inner wall of the inner cylinder body 40 can be sufficiently suppressed.

If the inner cylindrical body 40 is simply provided, the cooling air may not reach the bleed port 12a sufficiently, and dust may accumulate or adhere thereto. However, since the cooling air introduction device 10 includes the wind direction adjustment section 11, by changing the direction of the cooling air with the wind direction adjustment section 11 from the direction of the broken line arrow to the direction of the solid line arrow in FIG. Dust attached to the can be removed. Furthermore, when the amount of kiln exhaust gas generated decreases, the direction of the cooling air can be changed from the direction of the solid arrow to the direction of the dashed arrow in FIG. ) can be suppressed from flowing into the interior. The bleed gas 63 introduced into the inner cylinder 40 flows downstream of the inner cylinder 40 . On the downstream side of the inner cylinder 40, as shown in FIG. 1, a chamber 20, a heat exchanger 25, a dust collector 26, and a suction fan 28 may be provided.

FIGS. 7 and 8 are diagrams showing another modification of the chlorine bypass equipment. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. In this modification, similarly to the modification shown in FIG. 6, a double pipe 41 is inserted from the end 12b side of the bleed pipe 12 to promote the formation of a swirling flow inside the bleed pipe 12 and to guide the direction of movement of the swirling flow. is inserted. The double pipe 41 includes a first pipe 41A and a second pipe 41B inserted into the first pipe 41A. The first tubular body 41A is provided so as to be slidable along the longitudinal direction of the second tubular body 41B. As shown in FIG. 8, the first pipe body 41A and the second pipe body 41B are provided concentrically with the air bleed pipe 12 (center C). Similar to the inner cylinder body 40 in FIG. 6, the double pipe 41 has the function of promoting the formation of the swirling flow SF inside the bleed pipe 12 and guiding the swirling flow SF in the longitudinal direction of the bleed pipe 12. has.

By sliding the first tube 41A relative to the second tube 41B, the position of the tip 41a of the first tube 41A can be changed.

In this manner, in this modification, the position of the tip of the double pipe 41 in the air bleed pipe 12 can be made variable. Since the tip position of the double pipe 41 can be adjusted in conjunction with the adjustment of the introduction direction of the cooling air by the wind direction adjustment section 11, the flow state of the swirling flow can be adjusted with a higher degree of freedom. Therefore, even if there are large changes in the amount of kiln exhaust gas and dust generated, the dust will not accumulate and adhere to the inner wall of the bleed pipe 12, and the cooling air will not flow into the rising duct 51 (kiln bottom 52). can be sufficiently suppressed. The bleed gas 63 flows downstream of the double pipe 41. On the downstream side of the double pipe 41, as shown in FIG. 1, a chamber 20, a heat exchanger 25, a dust collector 26, and a suction fan 28 may be provided.

FIG. 9 shows an example of a chamber 20 provided in a chlorine bypass facility. FIG. 9(A) is a front view of the chamber 20A, and FIG. 9(B) is a top view of the chamber 20A. The chamber 20A includes a main body 21 having an internal space for separating at least part of dust contained in the bleed gas 63 from the bleed pipe 12, an introduction pipe 22 for introducing the bleed gas into the main body 21, and a main body 21. It includes a dust discharge pipe 24 that discharges dust separated from the bleed gas, and a discharge pipe 23 that leads out the bleed gas 64 containing less dust than the bleed gas 63 from the main body 21.

In the chamber 20A, an inlet 22a is formed at the connection between the main body 21 and the introduction tube 22, and an outlet 23a is formed at the connection between the main body 21 and the outlet tube 23. As shown in FIGS. 9(A) and 9(B), the extension line (virtual introduction line VG) of the bleed gas 63 introduced from the inlet 22a in the introduction direction is deviated from the outlet 23a, and the main body It intersects with the inner wall of 21. In the chamber 20A having such a main body portion 21, dust contained in the bleed gas 63 can be efficiently separated, and dust accompanying the bleed gas 64 led out from the outlet 23a can be sufficiently reduced. It is preferable that the virtual introduction line VG also deviates from the dust exhaust port 24a formed at the connection between the main body portion 21 and the dust exhaust pipe 24. Thereby, it is possible to suppress the dust that has been once separated from the bleed gas 63 from being mixed into the bleed gas 63 again.

FIG. 10 shows another example of a chamber provided in a chlorine bypass facility. FIG. 10(A) is a front view of the chamber 20B, and FIG. 10(B) is a top view of the chamber 20B. Like the chamber 20A, the chamber 20B also includes a main body 21, an introduction pipe 22, a dust discharge pipe 24, and a discharge pipe 23. As shown in FIGS. 10(A) and 10(B), the extension line (virtual introduction line VG) of the bleed gas 63 introduced from the inlet 22a in the introduction direction is deviated from the outlet 23a, and It intersects with the inner wall of 21. The virtual introduction line VG is also shifted from the dust outlet 24a. Therefore, the chamber 20B can also efficiently separate the dust contained in the bleed gas 63 and sufficiently reduce the dust accompanying the bleed gas 64 led out from the outlet 23a.

Note that the configuration of the chamber is not limited to that illustrated in FIGS. 9 and 10. For example, the virtual lead-in line VG shown in FIGS. 9 and 10 is shifted from the outlet 23a and the dust outlet 24a in the (A) front view and (B) top view, respectively. In either of the (A) front view and (B) top view, it may be shifted from the outlet 23a and the dust outlet 24a. Even in such an example, it is possible to efficiently separate the dust contained in the bleed gas 63. Further, it is also possible to suppress dust separated from the bleed gas 63 from being mixed into the bleed gas 63 again. Moreover, although the chlorine bypass equipment 100 of this embodiment is equipped with the chamber 20, it may not be equipped with a chamber in another embodiment. Even in this case, the dust contained in the bleed gas can be collected by the dust collector 26, for example.

The dust collector 26 may be a bag filter or a wet dust collector such as a wet scrubber. Further, a classifier may be provided upstream or downstream of the dust collector 26 separately from the dust collector 26.

FIG. 11 is a diagram showing cement clinker manufacturing equipment according to one embodiment. The cement clinker production equipment 200 includes a preheating and calcining section 70 that preheats and calcinates cement raw materials, a cement kiln 50 that obtains cement clinker by firing the preheated and calcined cement raw materials, and a cement clinker produced by the cement kiln 50. A clinker cooler 80 for cooling cement clinker is provided. The preheating and calcining section 70 includes four cyclones C1, C2, C3, and C4 (preheaters) and a calcining furnace 72.

The kiln bottom 52 of the cement kiln 50 and the calcining furnace 72 of the preheating calcining section 70 are connected by a rising duct 51. A bleed pipe 12 of a chlorine bypass facility 100 that bleeds the kiln exhaust gas generated in the cement kiln 50 and recovers dust contained in the kiln exhaust gas is connected to the vicinity of the connection between the rising duct 51 and the kiln bottom 52. The air bleed pipe 12 is provided with a cooling air introduction device 10 that introduces cooling gas along the circumferential direction of the side surface 13 thereof. The cooling air introduction device 10 includes a wind direction adjustment section 11 that adjusts the direction of the cooling air by changing the direction in which cooling gas is introduced into the air bleed pipe 12. By providing the chlorine bypass equipment 100, volatile components within the cement clinker manufacturing equipment 200 can be reduced.

The cement raw material introduced from the connection between the cyclone C1 and the cyclone C2 flows through the cyclone C1, the cyclone C2, the cyclone C3, the rising duct 51, the calcining furnace 72, and the cyclone C4 to the kiln bottom 52 of the cement kiln 50. be introduced. In the cement kiln 50, preheated and calcined cement raw material is heated by combustion in a burner 54 provided on the opposite side of the kiln bottom 52, and becomes cement clinker. The obtained cement clinker is cooled in a clinker cooler 80. After being cooled by clinker cooler 80, cement clinker is obtained.

Since the cement clinker manufacturing equipment 200 includes the cooling air introduction device 10, the direction of the cooling air to the bleed air pipe 12 is adjusted depending on the dust accumulation state in the bleed air pipe 12 and the operating status of the cement kiln 50. be able to. Therefore, it is possible to reduce the accumulation and adhesion of dust in the bleed pipe 12, and to stably operate the cement clinker manufacturing equipment 200.

The cement clinker manufacturing method according to one embodiment can be performed using the cement clinker manufacturing equipment 200. This manufacturing method includes a preheating and calcination step in which cement raw materials are preheated and calcined in a preheating and calcination section 70, and the preheated and calcined cement raw materials are introduced into the cement kiln 50 from a kiln bottom 52 to produce cement clinker. a cooling process in which cooling air is introduced along the circumferential direction of the side surface 13 of the bleed pipe 12 of the chlorine bypass equipment 100 to cool the bleed gas extracted in the bleed pipe 12; and a collection step of collecting the dust. Furthermore, a clinker cooling step may be included in which the cement clinker obtained in the firing step is cooled by a clinker cooler 80.

In the preheating and calcination step, cement raw materials are introduced from the flow path between the cyclones C1 and C2. The cement raw material flows through cyclones C1, cyclones C2, and cyclones C3 to be preheated. Thereafter, it is introduced into the calcining furnace 72 via the rising duct 51 and calcined. The calciner 72 may be provided with a burner that burns fuel such as coal. The cement raw material (calcined raw material) calcined in the calcining furnace 72 is introduced into the cyclone C4 and heated.

In the firing process, the calcined raw material heated by the cyclone C4 is introduced into the kiln bottom 52. Thereafter, it is fired in a cement kiln 50 to become cement clinker. In the cooling process, cooling air is introduced along the circumferential direction of the side surface 13 of the bleed pipe 12 to cool the bleed gas extracted by the bleed pipe 12. At this time, the direction of the cooling air is adjusted by changing the direction in which the cooling gas is introduced. In the cooling process, the direction of the cooling air to the bleed pipe 12 can be adjusted depending on the dust accumulation state in the bleed pipe 12 and the operating state of the cement kiln 50. Therefore, the accumulation and adhesion of dust within the bleed pipe 12 can be reduced, and the cooling process and firing process can be stabilized. Therefore, cement clinker can be stably produced.

In the cooling process, the direction of the cooling air introduced into the bleed pipe 12 from the cooling air introduction device 10 may be adjusted based on the operation information of the bleed pipe 12, the rising duct 51, the cement kiln 50, or the kiln bottom 52. . The direction of the cooling air can be adjusted by changing the direction in which the cooling gas is introduced using the airflow direction adjusting section 11 (11A to 11E).

According to the above manufacturing method, the dust in the bleed pipe 12 can be efficiently removed, and the cooling process and firing process can be stabilized. Therefore, cement clinker can be stably produced. The explanations regarding the chlorine bypass equipment 100 and the cement clinker manufacturing equipment 200 described above are also applied to the manufacturing method described above.

Although several embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments. The configurations of each embodiment and each modification may be combined or replaced. Further, the air bleed pipe 12 may be connected only to the kiln bottom 52 or only to the rising duct 51, or two or more air bleed pipes 12 may be connected to each of the rising duct 51 and the kiln bottom 52. . In this case, the dust-containing bleed gas extracted by the plurality of bleed pipes 12 may be mixed in a chamber to collect the dust, and after the dust is reduced in individual chambers, the remaining dust is collected in a dust collector. May be collected. Further, for example, the inner diameter of the bleed pipe 12 may not be constant and may vary along the longitudinal direction. In this case, the air bleed pipe 12 may have a tapered portion whose inner diameter decreases as it approaches the rising duct 51 (kiln bottom 52).

According to the present disclosure, there is provided a cooling air introduction device that can reduce dust accumulation and adhesion and stabilize the operation of a chlorine bypass facility. Moreover, by providing such a cooling air introduction device, a chlorine bypass facility and a cement clinker production facility that can be operated stably are provided. Furthermore, a method for producing cement clinker is provided that allows stable production of cement clinker.

DESCRIPTION OF SYMBOLS 10... Cooling air introduction device, 11, 11A, 11B, 11C, 11D, 11E... Wind direction adjustment part, 11a... Plate member, 11b... Plate member, 12... Air bleed pipe, 12a... Air bleed port, 12b... End part, 13...Side surface, 14...Introduction fan, 20, 20A, 20B...Chamber, 21...Main body, 22...Introduction pipe, 22a...Inlet, 23...Outlet pipe, 23a...Outlet, 24...Dust discharge pipe, 25... Heat exchanger, 24a... Dust outlet, 26... Dust collector, 28... Suction fan, 30... Shaft body, 32... Plate member, 33... Cylindrical member, 35... Gate member, 40... Inner cylindrical body, 40a ...Tip, 41...Double pipe, 41A...First tube, 41B...Second tube, 41a...Tip, 50...Cement kiln, 51...Rising duct, 52...Kiln butt, 54...Burner, 60... Kiln exhaust gas, 62... Cooling gas, 63, 64... Bleeding gas, 70... Preheating calcining section, 72... Calcining furnace, 80... Clinker cooler, 100... Chlorine bypass equipment, 200... Cement clinker production equipment.

Claims (7)

A cooling air introduction device that introduces cooling gas along the circumferential direction of a side surface of an air bleed pipe of a chlorine bypass facility,
A cooling air introduction device including a wind direction adjustment section that adjusts the direction of the cooling air by changing the introduction direction of the cooling gas introduced into the air bleed pipe. 2. The cooling air introduction device according to claim 1, wherein the wind direction adjustment section includes a shaft body and a member rotatably or swingably attached to the shaft body. The cooling air introducing device according to claim 1 or 2, wherein the air direction adjusting section includes at least one of a plate-like member and a deformable channel wall. a measuring unit that measures operating information of at least one selected from the air bleed pipe, or a rising duct, a cement kiln, and a kiln tail with which the air bleed pipe communicates; and a measuring unit that measures the operating information of at least one selected from the air bleed pipe, a rising duct with which the air bleed pipe communicates, and a kiln bottom, and the wind direction adjustment based on the operating information measured by the measurement unit. The cooling air introduction device according to any one of claims 1 to 3, further comprising: a control section that outputs a control signal for adjusting the direction of the cooling air to the section. A chlorine bypass facility comprising the cooling air introduction device according to any one of claims 1 to 4. A preheating calcining section, a cement kiln, a rising duct, and a chlorine bypass facility connected to the rising duct and/or the kiln bottom of the cement kiln,
Cement clinker production equipment, wherein the chlorine bypass equipment is equipped with the cooling air introduction device according to any one of claims 1 to 4. a preheating and calcination step for preheating and calcination of cement raw materials;
a firing step of manufacturing cement clinker by firing the preheated and calcined cement raw material;
A cooling step of introducing cooling gas along the circumferential direction of the side surface of the bleed pipe of the chlorine bypass equipment to cool the bleed gas extracted by the bleed pipe,
The method for producing cement clinker includes, in the cooling step, changing the introduction direction of the cooling gas to adjust the direction of the cooling air to cool the bleed gas.

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