JP7609677B2 - Dust treatment device, cement clinker manufacturing device, and cement clinker manufacturing method - Google Patents

Description

The present disclosure relates to a dust treatment device, a cement clinker manufacturing device, and a cement clinker manufacturing method.

Cement manufacturing facilities handle various types of dust. For example, Patent Document 1 describes a technique for removing dust that adheres to the heat transfer tubes of a waste heat boiler using a dust removal device. Patent Document 2 proposes a treatment device for mercury-containing materials that removes mercury by heat-treating mercury-containing dust. The treatment device in Patent Document 2 includes a screw conveyor that transports kiln dust and the like supplied from a hopper, an externally heated kiln that indirectly heats the mercury-containing dust supplied from the screw conveyor, and a sieving device that sieves the mercury-removed dust and grinding media discharged from the externally heated kiln. It is proposed that the mercury-removed dust obtained by the sieving device be used as a cement raw material, and that the remaining grinding media be returned to the hopper by a conveying device.

JP 2014-126329 A JP 2019-51494 A

In cement manufacturing facilities, due to factors such as equipment costs and layout, it is sometimes necessary to transport solids within the facility. One example of a means of transporting solids that requires low equipment costs is a belt conveyor. However, the dust that has adhered from the heat transfer tube as in Patent Document 1 and the dust that has been heat-treated as in Patent Document 2 are very hot and dry, so if they are transported as is by a belt conveyor, the heat resistance of the belt conveyor and dust generation can become an issue. On the other hand, if hot dust is mixed with water to cool it, water vapor will be generated by the heat, and there is a concern that a large amount of dust will be ejected and scattered together with the water vapor.

In this disclosure, therefore, a dust treatment device capable of smoothly cooling dust so that it can be transported stably is provided. In addition, a cement clinker manufacturing device capable of stably manufacturing cement clinker by including such a dust treatment device is provided. In addition, a cement clinker manufacturing method capable of stably manufacturing cement clinker is provided.

The present disclosure provides a dust treatment device that includes a mixing section that mixes dust and a water-containing fluid used in a cement manufacturing facility to generate water vapor, a flow path into which the fluid containing dust and water vapor from the mixing section flows, a water spraying section that sprays water into the flow path, and a recovery section that recovers a slurry that is generated in the flow path and contains dust and water from the water spraying section.

The above dust treatment device is equipped with a mixing section that mixes dust with a water-containing fluid, so that high-temperature dust can be smoothly cooled and transported with reduced dust generation. In addition, the water spray section sprays water into the flow path into which the water vapor generated in the mixing section and the dust-containing fluid flow, so that the flow path can be prevented from being blocked and the mixing section can be operated stably. In the flow path, the dust entrained by the water vapor smoothly becomes a slurry, which can be collected as a slurry in the collection section. In this way, even if the dust is at a high temperature, the above dust treatment device can smoothly cool the dust and transport it stably as dust or as a slurry.

It is preferable that the water spraying section has a plurality of outlets for discharging water into the flow path. This allows the dust entrained in the water vapor to be sufficiently slurried and collected.

The water spraying section is preferably configured to spray water into the flow path in the form of a spray. This allows water to be sprayed over a wide area within the flow path, so that dust entrained in the water vapor can be sufficiently slurried and collected.

It is preferable that the flow path has a sloped portion that is inclined with respect to the horizontal plane. This prevents the slurry generated in the flow path from stagnating, and allows the slurry to be smoothly discharged from the flow path.

The dust introduced into the mixing section may have a temperature of 150°C or higher. The dust treatment device preferably includes a supply section that sprays a water-containing fluid inside the mixing section. By including such a supply section, the dust can be smoothly cooled even in the mixing section.

The dust introduced into the mixing section preferably includes dust recovered by an exhaust heat power generation device that generates electricity using dust-containing exhaust gas as a heat source. High-temperature dust is recovered in the exhaust heat power generation device, but even this high-temperature dust can be cooled sufficiently smoothly. Therefore, the dust recovered from the exhaust heat power generation device can be cooled and transported stably.

The dust introduced into the mixing section preferably contains dust with reduced volatile components obtained by heating dust containing volatile components to reduce the volatile components. Even if the dust with reduced volatile components is at a high temperature after heating, the dust processing device can cool such dust sufficiently smoothly. Therefore, the dust with reduced volatile components can be transported stably.

The present disclosure provides a cement clinker manufacturing apparatus that includes any one of the dust treatment devices described above. Since such a cement clinker manufacturing apparatus includes any one of the dust treatment devices described above, it can stably produce cement clinker.

The present disclosure provides a method for producing cement clinker using the above-mentioned cement clinker production apparatus. This production method uses the above-mentioned cement clinker production apparatus, and therefore can stably produce cement clinker.

According to the present disclosure, it is possible to provide a dust processing device that can smoothly cool the dust and enable stable transport even when the dust is at a high temperature. In addition, by including such a dust processing device, it is possible to provide a cement clinker manufacturing device that can stably manufacture cement clinker. In addition, by using such a cement clinker manufacturing device, it is possible to provide a cement clinker manufacturing method that can stably manufacture cement clinker.

FIG. 1 is a diagram illustrating an example of a dust treatment device. 4 is an enlarged cross-sectional view showing an example of a connection portion between a water spray portion and a flow path. FIG. FIG. 13 is a diagram showing another example of the dust processing device. FIG. 1 is a diagram illustrating an example of a cement clinker manufacturing apparatus equipped with a dust treatment device.

One embodiment of the present invention will be described below, with reference to the drawings as needed. However, the following embodiment is merely an example for explaining the present invention, and is not intended to limit the present invention to the following content.

The dust treatment device according to one embodiment treats dust used in cement manufacturing facilities. Examples of dust used in cement manufacturing facilities include dust generated by various devices in the cement manufacturing facilities, and dust accepted as powdered raw materials and auxiliary materials in the cement manufacturing facilities. Specifically, examples of dust include dust recovered by an exhaust heat power generation device (exhaust heat boiler) installed in the cement manufacturing facilities, clinker dust generated in cement kilns and the like and collected by a chlorine bypass device, dust obtained as coarse powder by a classifier or the like in the chlorine bypass facility, dust collected by an electric dust collector, dust captured and collected by a bag filter, and coal ash and incineration ash accepted as a type of cement raw material.

In the example shown in FIG. 1, the dust treatment device 100 treats dust recovered by an exhaust heat power generation device 61 that uses exhaust gas generated in a cement manufacturing facility as a heat source. An example of the exhaust gas is exhaust gas discharged from a suspension preheater in a cement clinker manufacturing device.

The dust treatment device 100 includes a mixing section 10 that mixes the dust recovered by the exhaust heat power generation device 61 with a water-containing fluid to generate water vapor, a flow path 20 into which the fluid containing dust and water vapor derived from the mixing section 10 flows, a water sprinkling section 30 that sprinkles water into the flow path 20, and a recovery section 40 that recovers a slurry containing dust and water from the water sprinkling section 30 that is generated in the flow path 20.

Dust is introduced into the mixing section 10 from the inlet 11. The temperature of the dust when introduced into the mixing section 10 may be, for example, 120°C or higher, or 150°C or higher. Such high-temperature dust is usually dry, and therefore generates dust if it is transported directly on a belt conveyor. A supply section 35 is connected to the mixing section 10, and the supply section 35 sprays a water-containing fluid inside the mixing section 10. In the mixing section 10, the water-containing fluid from the supply section 35 is mixed with the dust, and the dust is cooled. By cooling the high-temperature dust in this manner, the dust can be transported with high safety.

The mixing section 10 may be, for example, a kneader equipped with an internal stirring mechanism. In the mixing section 10, the dust is cooled by mixing with a water-containing fluid. In the mixing section 10, the dust cooled to, for example, 100°C or less is discharged from the outlet 13 of the mixing section 10 and transported by the belt conveyor 12. The moisture concentration of the dust discharged from the mixing section 10 may be higher than that before it was introduced into the mixing section 10. This makes it possible to suppress dust generation.

When the dust cooled in the mixing section 10 is used as a cement raw material, the dust may be transported by the belt conveyor 12, for example, to a raw material silo, or to a mixing section where the cement raw material is mixed. The dust transported by the belt conveyor 12 is cooled more sufficiently than when it was collected by the exhaust heat power generation device 61. This allows the dust to be transported with a high degree of safety. Therefore, by using the dust processing device 100, it is possible to transport dust with reduced equipment costs.

In the mixing section 10, water vapor is generated because dust exceeding 100°C comes into contact with water. By releasing the water vapor through the flow path 20 connected to the mixing section 10, the internal pressure of the mixing section 10 increases, suppressing the blowing out of water vapor and dust from the outlet 13, etc. At this time, the water vapor flows into the flow path 20 connected to the mixing section 10 while carrying dust. The fluid containing water vapor and dust flows through the flow path 20. The flow path 20 has a pipe 21 through which the fluid containing water vapor and dust flows. Since the fluid flowing into the flow path 20 contains water vapor, the dust contains moisture and is likely to adhere to the inner wall of the pipe 21 that constitutes the flow path 20. Once such dust adheres to the inner wall, the dust attached to the inner wall may dry due to the high-temperature fluid that flows in later, forming a strong attachment. Even if the dust does not dry, the dust may continue to adhere and grow, which may cause blockage. If the flow path 20 becomes blocked, the internal pressure of the mixing section 10 rises, causing water vapor and dust to be blown out from the outlet 13, etc. In this case, the operation of the mixing section 10 must be stopped, and the operation of the exhaust heat power generation device 61 must be adjusted accordingly, resulting in a large loss in the amount of power generation.

Therefore, the pipe 21 constituting the flow path 20 in this example is connected to the water sprinkler section 30, which sprinkles water inside the pipe 21 (flow path 20). As a result, the dust that flows into the flow path 20 from the mixing section 10 is captured by the water and becomes a slurry. Therefore, it is possible to suppress the adhesion of dust inside the pipe 21 (flow path 20). The slurry generated in the pipe 21 is collected in the collection section 40 via the slurry discharge flow path 42 connected to the pipe 21 (flow path 20). The collection section 40 may be a container such as a tank. The slurry collected in the collection section 40 may be mixed with the water-containing fluid sprayed from the supply section 35 to the mixing section 10, or may be sprayed into the feed chute of the raw material mill. As a result, the dust contained in the slurry can be made into a cement raw material. In addition, by using the collected slurry in the mixing section 10 or the feed chute of the raw material mill, the industrial water used in those facilities can be reduced.

Figure 2 is an enlarged cross-sectional view showing an example of a connection between the water sprinkler unit 30 and the flow path 20. A fluid 50 containing dust and water vapor flows from left to right through the pipe 21 that constitutes the flow path 20. The water sprinkler unit 30 is equipped with a water sprinkler pipe 32 that spouts water 54. This water sprinkler pipe 32 is inserted into a through hole formed in the upper part of the pipe 21 that constitutes the flow path 20. An outlet 34 is formed at the tip of the water sprinkler pipe 32, and water 54 is spouted from the outlet 34 into the inside of the flow path 20 (pipe 21). Note that industrial water can be used as the water 54. The water 54 may contain a small amount of liquid components other than water.

The water 54 discharged from the outlet 34 collides with the water vapor and dust particles 51 contained in the fluid 50 flowing through the flow path 20. As a result, the water vapor is cooled and condensed, and flows down to the bottom of the pipe 21. The dust particles 51 also fall to the bottom of the pipe 21 due to contact with the discharged water. In this way, a slurry 53 containing dust particles 51 and water is generated at the bottom of the pipe 21. The mechanism of generating the slurry 53 is not particularly limited, and for example, water generated by condensing water vapor may adhere to the dust particles 51 and flow down to become the slurry 53. If the dust particles 51 have a temperature higher than 100°C, the water 54 may also be vaporized once. Thereafter, the temperature decreases as the water flows through the pipe 21, and it may become part of the slurry 53.

The water spraying unit 30 sprays water 54 from the outlet 34 into the pipe 21 that constitutes the flow path 20 in the form of a spray. This allows the water to be sprayed over a wide area in the pipe 21 as fine particles, making it easier to come into contact with the dust. Therefore, the dust entrained in the water vapor can be sufficiently turned into a slurry. A spray nozzle may be used for the outlet 34. The shape of the water 54 sprayed from the outlet 34 may be a cone shape or a fan shape.

2, the spray angle _θ1 of the spray when viewed in a vertical cross section passing through the discharge port 34 and cutting along the longitudinal direction of the pipe 21 may be 30° or more, 40° or more, or 50° or more. This allows the dust particles 51 contained in the fluid 50 to be sufficiently contacted with the water 54. From the viewpoint of promoting the flow of the slurry 53, the spray angle _θ1 of the spray may be less than 90°.

The sprinkler pipe 32 is inclined with respect to the pipe 21. The angle θ 2 between the flow direction (x direction) of the fluid 50 in the pipe 21 and the longitudinal direction (y direction) of the sprinkler pipe 32, measured in a direction rotating vertically downward (clockwise in FIG. 2) with the flow direction (x direction) of the fluid 50 as a reference, may be, for example, 5 to 90°. This angle θ ₂ is preferably 5 to 70°, more preferably ₁₀ to 60°, and even more preferably 15 to 45°. This improves the fluidity of the slurry 53 by the sprinkler pipe 32 from the outlet 34, and the slurry 53 can be sufficiently smoothly discharged from the outlet 24. In addition, the flow of the fluid 50 can be prevented from being obstructed.

The pipe 21 forms a gradient section 22 that is inclined with respect to the horizontal plane. In this way, by having the gradient section 22 in the flow path 20, it is possible to suppress the slurry 53 from stagnating. The gradient section 22 (pipe 21) has an inclination angle θ ₃ with respect to the horizontal plane of preferably 5° or more, more preferably 10° or more, and further preferably 15° or more. This allows the slurry 53 to flow smoothly by the action of gravity and be discharged from the outlet 24. The inclination angle θ ₃ is preferably 45° or less, and more preferably 30° or less. This allows the slurry 53 to flow in a state of being spread over a wide range in the pipe 21, making it easier for the slurry and dust to come into contact with each other. This makes it easier to collect the dust.

From the viewpoint of promoting the flow of the slurry 53, the inclination angle (θ ₂ +θ ₃ ) of the sprinkler pipe 32 with respect to the horizontal plane may be less than 90°, preferably 10 to 80°, or may be 20 to 70°.

At the lower end of the pipe 21, an outlet 24 is formed to discharge the slurry 53 from the pipe 21. The slurry 53 flows from the outlet 24 into the slurry discharge flow path 42 shown in FIG. 1 and is collected in the collection section 40. The flow path 20 in this example has a pipe 21 that is inclined so as to become lower from upstream to downstream with the flow direction of the fluid 50 as the gradient section 22, but is not limited to this. For example, the flow path 20 may have a gradient section that is inclined so as to become higher from upstream to downstream with the flow direction of the fluid 50 as the reference. As a result, the slurry 53 generated in the flow path 20 may be returned to the mixing section 10, or an outlet may be provided in the flow path between the mixing section 10 and the pipe 21 so that the slurry can be collected in the collection section 40.

2, the flow path 20 may have a through hole 26 and a lid 27 that covers the through hole 26. For example, when the amount of slurry 53 discharged from the outlet 24 decreases, the lid 27 can be removed from the pipe 21 to open the through hole 26, and the presence or absence of blockage inside the flow path 20 can be checked. The outlet 24 is preferably formed on the upper side of the pipe 21. This allows the lid 27 to be removed from the through hole 26 and the inside of the flow path 20 to be inspected while the dust processing device 100 is continuing to operate. A nozzle for spraying high-pressure water may be inserted from the through hole 26 to wash away dust particles 51 adhering to the inner wall of the pipe 21 and stagnant slurry 53 with the high-pressure water.

The pipe 21 that constitutes the flow path 20 and to which the water spraying unit 30 is connected is not limited to a straight pipe shape, and may have bent parts such as an L-shape or a U-shape. If the flow path that transports the fluid 50 containing dust particles 51 has a bent part, the dust particles 51 tend to adhere to the bent part, which may cause blockage. However, since the water spraying unit 30 is connected to the pipe 21 in this example, adhesion of the dust particles 51 is suppressed. Even if the dust particles 51 adhere, they can be made to flow by water spraying and discharged from the outlet 24. If a through hole 26 is provided at or near the bent part, even if the dust particles 51 adhere to the bent part or the slurry 53 remains, they can be easily removed.

The flow path 20 has a rising pipe 23 downstream of the pipe 21. Fluid 55 (second fluid) obtained by removing at least a portion of dust particles 51 from fluid 50 (first fluid) flows through pipe 23 downstream of pipe 21 and is introduced into a downstream device (e.g., an electric dust collector, etc.). Fluid 55 has a lower dust concentration and a lower temperature than fluid 50. As shown in FIG. 1, fluid 55 may be merged with exhaust gas from exhaust heat power generation device 61 and introduced into an electric dust collector (EP). In the rising pipe 23, water vapor remaining in fluid 55 may cool and condense by passing through the pipe, and become slurry 53 containing dust particles 51, which may be discharged from outlet 24.

A suction fan may be connected downstream of the rising pipe 23. The flow of the fluid 50 and the fluid 55 in the flow path 20 can be promoted by sucking in the gas with this suction fan. A flow rate measurement unit for the slurry 53 may be provided in the outlet 24 to detect the presence or absence or the degree of adhesion of dust particles 51 in the flow path 20, the presence or absence or the degree of retention of the slurry 53, or the presence or absence or the degree of blockage by the dust particles 51 or the slurry 53, according to the measured flow rate. In addition, a pressure measurement unit may be provided in the mixing unit 10 to detect the degree of adhesion, retention, or blockage of the dust or slurry 53 in the flow path 20 based on the pressure measured in the mixing unit 10.

It is preferable that the tip of the sprinkler pipe 32 does not protrude from the inner wall of the flow path 20 (piping 21) into the inside of the flow path 20. This prevents the sprinkler pipe 32 from interfering with the flow of the fluid 50 in the flow path 20. It also prevents dust particles 51 from adhering to the sprinkler pipe 32. The base end of the sprinkler pipe 32 may be connected to a pump that supplies water, or to a pipe that supplies industrial water. Water may also be supplied from a tank located at an elevated position using head pressure. This allows the sprinkler pipe 32 to continuously sprinkle water inside the flow path 20.

In FIG. 2, only one sprinkler pipe 32 is shown, but as shown in FIG. 1, multiple sprinkler pipes 32 may be provided. This provides multiple water outlets 34 in the pipe 21, and even if the length of the pipe 21 is long, the slurry 53 can be discharged sufficiently smoothly from the outlet 24. Note that the pipe 21 may also be provided with multiple outlets 24. For example, if inclined pipes and rising pipes that are inclined so that the downstream side is lower than the horizontal plane are alternately arranged, and an outlet 24 is provided at the connection between the inclined pipes and the rising pipes, the transport distance of the fluid 50 (fluid 55) can be sufficiently long. In other words, the transport distance of the fluid 50 (fluid 55) through the flow path 20 can be sufficiently long.

When viewed along the flow direction of the fluid 50 (fluid 55), the interval between adjacent sprinkler pipes 32 (outlets 24) along the flow direction may be, for example, 0.5 to 10 m, or 2 to 7 m. When three or more sprinkler pipes 32 (outlets 24) are provided, the interval between adjacent sprinkler pipes 32 (outlets 24) along the flow direction does not have to be uniform. It may be adjusted as appropriate in consideration of the presence or absence of bends, the state of dust adhesion, etc.

In the dust processing device 100, the fluid containing the water vapor generated when the high-temperature dust comes into contact with water in the mixing section 10 and the dust entrained in the water vapor can be sufficiently cooled by spraying water from the water spraying section 30. The dust contained in the fluid is then collected as a slurry. This sufficiently prevents blockage of the flow path due to dust and the slurry containing the dust. Therefore, by providing the dust processing device 100, the high-temperature dust can be smoothly cooled to prevent dust generation, and can be transported stably and safely as dust and slurry 53.

Figure 3 is a diagram showing another example of a dust treatment device. When dust containing volatile components is heated, dust with reduced volatile components is obtained. Here, mercury-containing dust is used as an example of dust containing volatile components. In the dust treatment device 101, dust (reduced mercury dust) obtained by reducing mercury from mercury-containing dust in a heating device 63 that heats the mercury-containing dust is introduced into the mixing section 10. Meanwhile, the gas containing mercury separated from the dust in the heating device 63 flows through a bag filter 82, a cooling tower 84, and an adsorption tower 86 filled with activated carbon. This allows the mercury to be recovered.

In the dust treatment device 101, dust (mercury-reduced dust) having a temperature of, for example, 300°C or higher is introduced into the mixing section 10. Such high-temperature dust is also sufficiently cooled in the mixing section 10. Therefore, by treating high-temperature dust with the dust treatment device 101, it becomes possible to transport the dust with high safety. The device configuration after the mixing section 10 of the dust treatment device 101 may be the same as that of the dust treatment device 100. Since the description of the dust treatment device 100 can be applied here, overlapping descriptions are omitted. In this example, the dust cooled in the mixing section 10 and transported by the belt conveyor 12 may be used as a cement raw material as in the above example, or may be mixed with gypsum in cement clinker to obtain a cement composition. In addition, although mercury-containing dust is given as an example of a volatile component, other volatile components may be used. For example, chlorine-containing dust may be used. When chlorine-containing dust is used, chlorine is separated from the dust by the heating device 63. The chlorine in the separated chlorine-containing gas is cooled and condenses and solidifies into dust. The dust containing concentrated chlorine obtained in this way can be collected using a bag filter.

Figure 4 is a schematic diagram showing an example of a cement clinker manufacturing apparatus equipped with a dust processing device 100. The cement clinker manufacturing apparatus 150 in Figure 4 includes a preheating and calcining section 70 in which cement raw materials are introduced and the cement raw materials are preheated and calcined, a calcining section 90 in which the preheated and calcined cement raw materials are calcined to obtain cement clinker, and a cooling section 91 (clinker cooler) in which the cement clinker obtained in the calcining section 90 is cooled. The preheating and calcining section 70 has four cyclones C1, C2, C3, and C4 (preheaters) and a calciner 72.

The bottom 92 of the cement kiln 96 and the calciner 72 of the preheating calcination section 70 are connected by a rising duct 74. Between the bottom 92 and the rising duct 74 (at the boundary) is provided an extraction port 81 for extracting the kiln exhaust gas flowing through them. A flow path 89 of the chlorine bypass section 80 is connected to the extraction port 81. By providing the chlorine bypass section 80, the cement clinker manufacturing apparatus 150 can reduce the volatile components in the calcination section 90.

In the chlorine bypass section 80, the extracted gas extracted from the extraction port 81 is cooled in the cooling section 83. By cooling, volatilized chlorine such as KCl and NaCl in the cement clinker manufacturing equipment 150 is precipitated. A suction fan 87 is provided downstream of the dust collection section 85, and the chlorine precipitated in the cooling section 83 is collected in the dust collection section 85 as clinker dust. The dust collection section 85 may be, for example, a bag filter. In this way, the chlorine content in the cement clinker manufacturing equipment 150 is reduced. The position of the extraction port 81 is not particularly limited, and may be the rising duct 74 or the kiln butt 92.

The cement raw material introduced from the connection between the cyclone C1 and the cyclone C2 of the preheating calcination section 70 may contain the dust discharged from the mixing section 10 of the dust treatment device 100 and the solids (dust) obtained by drying the slurry 53 recovered in the recovery section 40. Such cement raw material flows through the cyclone C1, the cyclone C2, the cyclone C3, the rising duct 74, the calcination furnace 72, and the cyclone C4 and reaches the kiln end 92 of the cement kiln 96. In the cement kiln 96, the preheated and calcined cement raw material is heated by the combustion of the burner 94 installed on the rear end side of the cement kiln 96 to become cement clinker. The obtained cement clinker is cooled by the cooling gas in the clinker cooler of the cooling section 91. After being cooled in the clinker cooler, the cement clinker is discharged from the cement clinker manufacturing device 150.

On the other hand, exhaust gas is discharged from the preheating calcination section 70. This exhaust gas flows through a flow path 71 and is introduced into the exhaust heat power generation device 61. In the exhaust heat power generation device 61, power is generated using the heat of the exhaust gas. Since the exhaust gas contains dust, the dust adheres to, for example, the heat transfer tube of the exhaust heat power generation device 61. The attached dust is detached from the heat transfer tube by, for example, hammering, and introduced into the dust processing device 100. The dust and slurry discharged from the dust processing device 100 may be mixed with other raw materials in a blending device that blends cement raw materials, and then crushed in a raw material mill, and the crushed cement raw materials may be introduced into the preheating calcination section 70. The exhaust gas from the exhaust heat power generation device 61 is introduced into the electric dust collector 65 together with the exhaust gas (fluid 55) from the dust processing device 100.

Since the cement clinker manufacturing apparatus 150 is equipped with the dust processing device 100, it is possible to prevent blockage of the pipe through which the dust-containing water vapor flows and generation of dust during dust transport. In addition, since the dust can be sufficiently cooled, the dust can be transported with a high degree of safety. This prevents equipment troubles and improves the working environment. Therefore, the cement clinker manufacturing apparatus 150 can continuously and stably manufacture cement clinker.

The cement clinker manufacturing apparatus 150 may be equipped with a heating device 63 and a dust treatment device 101 as shown in FIG. 3 instead of or in addition to the exhaust heat power generation device 61. This allows the dust obtained by reducing the volatile components of the volatile component-containing dust (volatile component-reduced dust) to be used as a cement raw material.

A method for producing cement clinker according to one embodiment can be performed using a cement clinker production apparatus 150. The method for producing cement clinker includes a step of cooling dust in the mixing section 10 of the dust treatment device 100 (101), a preheating and calcining step of preheating and calcining the cement raw material containing dust in the preheating and calcining section 70, a firing step of firing in the firing section 90, and a cooling step of cooling the fired product in the cooling section 91. The cement raw material used in the method for producing cement clinker may contain dust obtained by drying the slurry 53 obtained in the dust treatment device 100 (101). In this case, the method may include a step of spraying water on a fluid 50 containing dust and water vapor generated in the mixing section 10, a step of recovering a slurry containing dust and water obtained by the spraying step, and a step of recovering dust from the recovered slurry. The process of recovering dust from the slurry may be performed by introducing a cooling fluid containing the slurry from the supply unit 35 into the mixing unit 10, or by spraying the slurry together with water into the input chute of a raw material mill used to grind the cement raw material.

This manufacturing method can be performed using a cement clinker manufacturing apparatus 150 equipped with a dust processing device 100, or a modified version thereof. Therefore, the above description of the cement clinker manufacturing apparatus and dust processing device also applies to the cement clinker manufacturing method of this embodiment.

In the above-mentioned method for producing cement clinker, cement clinker is produced using a cement clinker production apparatus equipped with a dust treatment device 100 (101). Therefore, cement clinker can be produced stably. In addition, since dust can be efficiently converted into a cement raw material, cement clinker can be produced at low cost.

The above describes an embodiment of the present invention, but the present invention is not limited to the above embodiment.

10...mixing section, 11...inlet, 12...belt conveyor, 13...outlet, 20, 71, 89...flow path, 21...piping, 22...gradient section, 23...rising pipe, 24...outlet, 26...through hole, 27...lid, 30...spraying section, 32...spraying pipe, 34...discharge port, 35...supply section, 40...recovery section, 42...slurry outlet flow path, 50, 55...fluid, 51...dust particles, 53...slurry, 54...water, 61...exhaust heat power generation device, 63...heating device 70...preheating calcination section, 72...calcination furnace, 74...rising duct, 80...chlorine bypass section, 81...exhaust port, 82...bag filter, 83, 91...cooling section, 84...cooling tower, 85...dust collection section, 86...adsorption tower, 87...suction fan, 90...calcination section, 92...kiln bottom, 94...burner, 96...cement kiln, 100, 101...dust treatment device, 150...cement clinker manufacturing device, C1, C2, C3, C4...cyclone.

Claims (9)

A mixing section that mixes dust and a water-containing fluid used in the cement manufacturing facility to generate water vapor;
a flow path into which a fluid containing the dust and the water vapor from the mixing section flows;
A water spray unit that sprays water into the flow path;
a recovery section that recovers a slurry generated in the flow path and containing the dust and the water from the water spray section. The dust treatment device according to claim 1, wherein the water spray unit has a plurality of outlets for discharging the water within the flow path. The dust treatment device according to claim 1 or 2, wherein the water spray unit sprays the water into the flow path in the form of a spray. The dust treatment device according to any one of claims 1 to 3, wherein the flow path has a sloped portion that is inclined relative to a horizontal plane. The dust introduced into the mixing section has a temperature of 150° C. or more,
The dust treatment device according to any one of claims 1 to 4, further comprising a supply section that sprays the water-containing fluid inside the mixing section. The dust treatment device according to any one of claims 1 to 5, wherein the dust introduced into the mixing section includes dust recovered by an exhaust heat power generation device that generates electricity using exhaust gas containing the dust as a heat source. The dust treatment device according to any one of claims 1 to 5, wherein the dust introduced into the mixing section includes dust with reduced volatile components obtained by heating dust containing volatile components to reduce the volatile components. A cement clinker manufacturing device equipped with the dust treatment device according to any one of claims 1 to 7. A method for producing cement clinker, comprising the steps of: producing cement clinker using the cement clinker production apparatus described in claim 8;

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