JP7471126B2 - Chamber, chlorine bypass equipment, cement clinker production equipment, and method for producing cement clinker - Google Patents

Description

The present disclosure relates to a chamber, a chlorine bypass system, a cement clinker production system, and a method for producing cement clinker.

A wide variety of waste materials are treated in cement clinker manufacturing facilities. In recent years, as the amount of waste treated has increased, the amount of volatile components such as chlorine and sulfur input into cement kilns has also increased. These volatile components adhere to the inside of the manufacturing equipment, causing coating, which affects the operation of the cement clinker manufacturing equipment. For this reason, many cement clinker manufacturing facilities are equipped with chlorine bypass equipment to reduce volatile components.

Patent Document 1 discloses a gas branching device that is applied to a chlorine bypass facility having a probe, a cyclone, a chamber, a cooler, a bag filter, etc. This gas branching device is equipped with a gas inlet duct that introduces bleed gas from the cement manufacturing process, a chamber, and a gas outlet duct. In such a gas branching device, it is proposed to connect the gas inlet duct and the gas outlet duct at a distance from each other in order to prevent short-circuiting of gas in the chamber and ensure the gas mixing effect.

JP 2006-137644 A

In a chamber such as that of Patent Document 1, gas is discharged in the same direction from multiple gas outlet ducts formed on the same surface, so there is concern that bias in the dust concentration of the discharged gas may occur depending on the gas introduction direction. If such a phenomenon occurs, there is concern that the dust recovery rate will also decrease if the chamber is designed to recover dust. In addition, even if the chamber is not designed to recover dust, there is concern that the properties of the gas discharged from the outlet duct may fluctuate, causing the operation of the chlorine bypass equipment to become unstable.

In this disclosure, therefore, a chamber capable of stabilizing the operation of a chlorine bypass facility is provided. In addition, by providing such a chamber, a chlorine bypass facility and a cement clinker production facility capable of stable operation are provided. In addition, a cement clinker production method capable of stably producing cement clinker is provided.

A chamber according to one aspect of the present disclosure is provided in a chlorine bypass in a cement clinker manufacturing facility, and has a main body that branches off multiple gases. The main body has at least one inlet for introducing gas and multiple outlets for discharging gas, and the gas is discharged in different directions from the multiple outlets, and the direction of gas introduction from the inlet is different from any of the directions of gas discharged from the multiple outlets.

When multiple outlets are provided in the chamber, if the gas discharged from the multiple outlets has the same discharge direction, the gas is likely to flow unevenly in the main body, and the flow time is likely to vary. As a result, gas cooling and dust separation cannot be performed sufficiently. In contrast, in the above chamber, the gas discharge directions at the multiple outlets are different from each other, and the gas introduction direction from the inlet is different from any of the gas discharge directions from the multiple outlets. Therefore, the gas introduced from the inlet flows sufficiently in the main body, and the internal space in the main body can be effectively used to efficiently cool the gas and separate the dust. Therefore, the operation of the chlorine bypass equipment can be stabilized. However, the above-mentioned chamber is not limited to one that separates dust, and dust may be entrained in the gas discharged from the outlet.

In the above-mentioned chamber, it is preferable that the virtual flow path extending along the introduction direction of the gas introduced from the inlet is offset from any of the multiple outlets. This makes it possible to suppress the occurrence of so-called short-circuit flow, in which the gas introduced from the inlet does not flow freely in the main body and is directly discharged from the outlet. This makes it easier for the gas introduced from the inlet to collide with the inner wall of the main body, allowing for efficient cooling of the gas and separation of dust. This makes it possible to further stabilize the operation of the chlorine bypass equipment.

It is preferable that gas containing bleed gas bled from the cement clinker manufacturing equipment is introduced from the inlet, and gas containing bleed gas is discharged from the multiple outlets. The amount and dust concentration of such bleed gas is likely to vary depending on the operating conditions of the cement kiln. Even if the flow rate or dust concentration varies with the variation in the amount of gas generated, the chamber can suppress differences in the properties, temperature, dust concentration, etc. between the branched gases.

The main body of the chamber preferably has multiple inlets, through which the bleed gas and cooling gas bled in the cement clinker manufacturing facility are respectively introduced. This allows the bleed gas to be cooled in the chamber. Furthermore, although the bleed gas and cooling gas usually differ greatly in temperature and properties, even if these gases are introduced, they are sufficiently mixed in the main body, making it possible to suppress differences in the properties, temperature, dust concentration, etc., between the branched gases.

It is preferable that a dust outlet for discharging dust contained in the bleed gas is connected to the main body of the above-mentioned chamber. In this chamber, the gas introduced from the inlet is likely to collide with the inner wall of the main body, so that dust can be efficiently separated from the gas and the separated dust can be discharged and collected from the dust outlet.

At least one of the inlet and outlet may be provided at the tip of a cylinder inserted inside the main body. This allows the position and introduction direction of the gas inlet, or the position and outlet direction of the gas outlet, to be set with a high degree of freedom. This further suppresses fluctuations in the properties of the branched gas, and further stabilizes the operation of the chlorine bypass equipment.

The chlorine bypass equipment according to one aspect of the present disclosure includes any one of the chambers described above. This suppresses fluctuations in the properties of the gas branched off in the chamber, such as temperature and dust concentration, allowing the chlorine bypass equipment to be operated stably.

The cement clinker production facility according to one aspect of the present disclosure includes a preheating and calcining section, a cement kiln, a rising duct, and the above-mentioned chlorine bypass facility having an air extraction pipe connected to the rising duct and/or the bottom of the cement kiln. Since the cement clinker production facility includes a chlorine bypass facility having any of the above-mentioned chambers, fluctuations in the properties of the gas branched off in the chamber, such as the temperature and dust concentration, are suppressed. Therefore, the cement clinker production facility can be operated stably.

The method for producing cement clinker according to one aspect of the present disclosure includes a preheating and calcining process for preheating and calcining the cement raw materials, a calcination process for calcining the preheated and calcined cement raw materials to produce cement clinker, and a recovery process for recovering at least a portion of the volatile components contained in the kiln exhaust gas generated in the calcination process as dust using the above-mentioned chlorine bypass equipment.

This manufacturing method includes a recovery process in which dust is recovered using the chlorine bypass equipment described above. This allows for stable processing of dust, stabilizing each process and enabling stable production of cement clinker.

According to the present disclosure, it is possible to provide a chamber capable of stabilizing the operation of a chlorine bypass facility. Furthermore, by providing such a chamber, it is possible to provide a chlorine bypass facility and a cement clinker production facility capable of stable operation. It is also possible to provide a cement clinker production method capable of stably producing cement clinker.

FIG. 1 is a diagram showing an overview of a chlorine bypass facility according to one embodiment. FIG. 2 is a diagram showing an example of a chamber provided in the chlorine bypass facility. FIG. 2 is a diagram showing an example of a chamber provided in the chlorine bypass facility. FIG. 2 is a diagram showing an example of a chamber provided in the chlorine bypass facility. FIG. 2 is a diagram showing the lead-out directions of two lead-out pipes connected to one side of an example of a chamber provided in a chlorine bypass facility when viewed from the front. 13 is a front view showing an example of an obstacle provided inside the main body. FIG. FIG. 1 is a diagram showing a cement clinker production facility according to an embodiment. FIG. 13 is a diagram showing a chamber of a comparative example.

An embodiment of the present disclosure will be described below, with reference to the drawings where appropriate. However, the following embodiment is an example for explaining the present disclosure, and is not intended to limit the present disclosure to the following content. In the description, the same reference numerals will be used for the same elements or elements having the same functions, and duplicated descriptions will be omitted where appropriate. Furthermore, unless otherwise specified, positional relationships such as up, down, left, and right will be based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of each element are not limited to those shown in the drawings.

Figure 1 is a diagram showing an overview of a chlorine bypass facility according to one embodiment. The chlorine bypass facility 100 is installed in a cement clinker production facility 200 that includes a cement kiln 50, a kiln butt 52, and a rising duct 51, and extracts kiln exhaust gas that contains volatile components such as chlorine generated during the production of cement clinker, recovers the volatile components such as chlorine contained in the extracted gas as dust, and reduces the volatile components in the cement clinker production facility.

The chlorine bypass equipment 100 includes an extraction pipe 12 that extracts kiln exhaust gas from the rising duct 51 and/or the kiln end 52 of the cement kiln 50, mixes the extracted kiln exhaust gas with a cooling gas to obtain an extraction gas containing the kiln exhaust gas and the cooling gas, an introduction fan 14 for supplying the cooling gas to the extraction pipe 12, a chamber 20 that mixes the extraction gas from the extraction pipe 12 with the cooling gas, separates the lumpy dust, and branches the mixed gas containing the extraction gas, an introduction fan 15 for introducing the cooling gas into the chamber 20, a heat exchanger 25 that cools the branched extraction gas to below the melting point of the volatile alkali salt, a dust collector 26 that separates dust (chlorine bypass dust) contained in the extraction gas that precipitates as it cools from the extraction gas, and a suction fan 28 that extracts the extraction gas through the chamber 20, the heat exchanger 25, and the dust collector 26. The extraction pipe 12 may be called an extraction probe. Examples of the suction fan 28 include conventional suction fans such as a sirocco fan and a turbo fan.

The introduction fan 14 supplies the cooling gas to the cooling gas introduction section 10, which introduces the cooling gas into the extraction pipe 12. The introduction fan 15 introduces the cooling gas into the chamber 20. The cooling gas may be air at room temperature, or may include exhaust gas generated in a factory or the like. Examples of exhaust gas include odorous gases generated during the reception, storage, and fermentation of water-containing sludge such as sewage sludge brought into a cement manufacturing plant, and exhaust gases discharged from the suction fan 28 and suction fans of other processes.

In the chamber 20, the bleed gas and the cooling gas are mixed, and the mixed gas is branched into two. The mixed gas (bleed gas) branched in the chamber 20 flows sequentially through the heat exchanger 25 and the dust collector 26. The raw material dust bled together with the bleed gas is collected in the chamber 20 and discharged from the dust outlet. The remaining dust contained in the bleed gas is collected in the dust collector 26. If a large amount of raw material dust can be collected in the chamber 20, chlorine bypass dust with a high chlorine concentration can be collected in the dust collector 26. The dust collector 26 may be a bag filter or a wet dust collector such as a wet scrubber. In addition, a classifier may be provided upstream or downstream of the dust collector 26 in addition to the dust collector 26.

The chlorine bypass equipment 100 is branched into two systems downstream of the chamber 20. For example, if the concentration of volatile components in the kiln exhaust gas increases and the amount of dust recovered by the chlorine bypass equipment 100 increases, or if an additional cement kiln 50 is installed, the chlorine bypass equipment 100 and the cement clinker production equipment 200 can be operated stably by branching the downstream side of the chamber 20 into two systems.

Figure 2 is a diagram showing an example of a chamber provided in a chlorine bypass facility. The chamber 20 has a main body 40 having an internal space through which gas can flow, two inlet pipes 30, 32 connected to the main body 40 for introducing gas into the main body 40, two outlet pipes 34, 38 connected to the main body 40 for discharging the gas mixed in the main body 40 from the main body 40, and a dust discharge pipe 36 connected to the main body 40 for discharging dust separated from the bleed gas.

Inlet ports 30A and 32A are formed at the connection between the main body 40 and the two inlet pipes 30 and 32, respectively, and outlet ports 34B and 38B are formed at the connection between the main body 40 and the two outlet pipes 34 and 38, respectively. A dust outlet port 36B is formed at the connection between the main body 40 and the dust outlet pipe 36. That is, the chamber 20 has the inlet port 30A, inlet port 32A, outlet port 34B, outlet port 38B, and dust outlet 36B in the main body 40.

The bleed gas 60 and the cooling gas 61 that cools the bleed gas that have flowed through the inlet pipes 30 and 32 are introduced into the main body 40 from the inlet 30A and the inlet 32A formed on the surface 40a of the main body 40, respectively. The bleed gas 60 and the cooling gas 61 introduced into the main body 40 join and mix in the main body 40. The mixed gas 62 that flows and mixes in the main body 40 is discharged from the outlet 34B and the outlet 38B to the outlet pipe 34 and the outlet pipe 38, respectively. In this way, the mixed gas 62 containing the bleed gas and the cooling gas is branched in the chamber 20. The dust 65 contained in the bleed gas 60 is discharged from the dust outlet 36B by the dust discharge pipe 36.

The discharge directions _d2 and _d3 of the mixed gas 62 at the outlet 34B and the outlet 38B are both different from the introduction directions _d0 and _d1 of the bleed gas 60 and the cooling gas 61 at the inlets 30A and 32A. Therefore, the introduced bleed gas 60 and the cooling gas 61 need to change direction in the main body 40. The change in direction disturbs the flow of these gases, promoting the mixing of the gases. In addition, the discharge directions _d2 and _d3 of the mixed gas 62 at the outlet 34B and the outlet 38B are also different from each other. Since the discharge directions of the mixed gases 62 are different from each other in this way, it is difficult for a short circuit flow of the gas to occur, and the gas flow in the main body 40 becomes complicated. Therefore, the dust stalls due to a localized decrease in flow velocity caused by the change in direction of the gas, making it easier for the dust to separate, and the amount of dust 65 collected from the dust discharge pipe 36 can be increased. In addition, the mixing of the gases can be promoted by making the gas flow more complicated. In addition, the variation in the flow time of the mixed gas within the main body 40 is reduced, and the cooling and separation of the dust 65 in the main body 40 can be promoted.

In the present disclosure, the gas introduction direction at the inlet depends on the connection angle at the connection part between the inlet pipe and the main body. Also, the gas discharge direction at the outlet depends on the connection angle at the connection part between the outlet pipe and the main body. For example, in two outlets provided on the same surface, if the angle between the imaginary plane covering the outlet and the center line of the outlet pipe is the same, the two discharge directions are the same, and if the angle is different, the two discharge directions are different from each other. Similarly, for example, in two inlets provided on the same surface (e.g., inlets 30A and 32A in FIG. 2), if the angle between the imaginary plane covering the inlet and the center line of the inlet pipe 30 and 32 is the same, the two introduction directions are the same, and if the angle is different, the two introduction directions are different from each other. Note that the dust outlet is different from the gas outlet, so the discharge direction at the dust outlet can be set without any particular restrictions.

In the chamber 20, the multiple virtual flow paths VL ₀ , VL ₁ extending along the introduction directions d ₀ , d 1 of the bleed gas 60 and the cooling gas ₆₁ introduced from the multiple inlets 30A, 32A are offset from each of the multiple outlets 34B, 38B. This suppresses the occurrence of a short-circuit flow, and the bleed gas 60, the cooling gas 61, or a mixed gas 62 thereof introduced from the inlets 30A, 32A easily collide with the inner wall of the main body 40, so that the mixed gas 62 can be cooled and the dust 65 can be separated efficiently. Here, when gas is introduced in the chamber 20 so that the virtual flow path VL ₀ of the bleed gas and the virtual flow path VL ₁ of the cooling gas intersect, the bleed gas 60 and the cooling gas 61 collide with each other, and the gases can be mixed and the dust can be separated more efficiently.

In this disclosure, a virtual flow path is a three-dimensional region that occupies a part of the internal space of the main body, extending from the opening edge of the gas inlet along the gas introduction direction. If the inlet is circular, the virtual flow path will be cylindrical. If the inlet is rectangular, the virtual flow path will be rectangular prism-shaped. An obstacle may be provided inside the main body to block this virtual flow path. This makes the gas flow path more complex, further reducing the variation in gas flow time in the main body.

In the chamber 20, the multiple outlets 34B, 38B are formed on the surfaces 40b, 40c of the main body 40. In this way, by providing the multiple outlets 34B, 38B on different surfaces, it is possible to further suppress the uneven flow of gas in the internal space of the main body 40. This makes it possible to more effectively utilize the internal space of the main body 40, and to further promote the cooling of the mixed gas 62 and the separation of the dust 65.

Figure 3 is a diagram showing another example of a chamber provided in a chlorine bypass facility. Chamber 20A has a main body 40 having an internal space through which gas can flow, two inlet pipes 31 and 33 connected to the main body 40 for introducing gas into the main body 40, two outlet pipes 35 and 37 connected to the main body 40 for discharging the mixed gas mixed in the main body 40 from the main body 40, and a dust discharge pipe 36 connected to the main body 40 for discharging dust separated from the bleed gas.

The inlet pipes 31, 33 have cylindrical bodies 31G, 33G inserted inside the main body 40. The tips of the cylindrical bodies 31G, 33G are provided with inlet ports 31A, 33A. Outlet ports 35B, 37B are formed at the connection between the main body 40 and the two outlet pipes 35, 37, respectively. A dust outlet port 36B is formed at the connection between the main body 40 and the dust outlet pipe 36. That is, the chamber 20A has inlet port 31A, inlet port 33A, outlet port 35B, outlet port 37B, and dust outlet 36B in the main body 40.

The bleed gas 60 and the cooling gas 61 that cools the bleed gas 60 that have flowed through the inlet pipes 31 and 33 are introduced into the main body 40 from the inlet 31A and the inlet 33A formed at the tip of the cylinders 31G and 33G, respectively. The bleed gas 60 and the cooling gas 61 introduced into the main body 40 join together in the main body 40, flow and mix. The mixed gas 62 is discharged from the outlet 35B and the outlet 37B to the outlet pipe 35 and the outlet pipe 37, respectively. In this way, the mixed gas 62 containing the bleed gas and the cooling gas is branched in the chamber 20A. The dust 65 contained in the bleed gas 60 is discharged by the dust discharge pipe 36 from the dust discharge port 36B.

The discharge directions _d4 and _d5 of the mixed gas at the outlets 35B and 37B are different from each other. In addition, both of the discharge directions _d4 and _d5 are also different from the introduction directions _d0 and _d1 of the bleed gas 60 and the cooling gas 61 at the inlets 31A and 33A. In addition, the multiple virtual flow paths _VL1 and VL3 extending along the introduction directions _d0 and _d1 of the bleed gas 60 and the cooling gas 61 introduced from the inlets 31A and _33A are shifted from both of the multiple outlets 35B and 37B.

In the chamber 20A, the inlets 31A and 33A are provided at the tips of the cylinders 31G and 33G inserted inside the main body 40. By providing the cylinders 31G and 33G inside the main body 40, the gas flow state inside the main body 40 can be adjusted with a high degree of freedom. For example, if the dust concentration or flow rate in the extracted gas 60 has changed significantly compared to when the chlorine bypass equipment 100 was initially designed, the gas flow state inside the main body 40 can be adjusted with a high degree of freedom by changing the length and shape of the cylinder inserted inside the main body 40 without replacing the chamber 20A itself.

The shape of the cylinder inserted into the main body 40 is not limited to a straight pipe, and may be bent or have a narrowed portion. In the chamber 20A, both the inlets 31A and 33A are provided at the tip of the cylinder 31G and 33G inserted into the main body 40, but only one of them may be provided at the tip of the cylinder inserted into the main body 40. At least one of the outlets 35B and 37B may be provided at the tip of the cylinder inserted into the main body 40. In this case, the outlet directions d ₄ and d 5 of the mixed gas 62 at the outlets 35B and 37B at the tip of the cylinder are different from each other. The outlet directions d ₄ and d ₅ of the mixed gas 62 are also different from the introduction directions d ₀ and d ₁ of the bleed gas 60 and the cooling gas ₆₁ .

Figure 4 is a diagram showing yet another example of a chamber provided in a chlorine bypass facility. Chamber 20B has a main body 40 having an internal space through which gas can flow, two inlet pipes 41 and 42 connected to the main body 40 for introducing gas into the main body 40, and two outlet pipes 44 and 46 connected to the main body 40 for discharging the mixed gas mixed in the main body 40 from the main body 40. Chamber 20B in this example does not have a dust discharge pipe 36 for discharging dust. In this case, dust may be discharged, for example, from the outlet pipes 44 and 46 together with the mixed gas and collected by a dust collector 26 downstream of chamber 20B.

FIG. 4 does not show imaginary flow paths extending along the introduction directions _d0 , d6 of the bleed gas 60 and the cooling gas ₆₁ introduced from the inlets 41A, 42A, but these imaginary flow paths are offset from both of the outlets 44B, 46B.

The discharge directions _d2 and _d7 of the mixed gas at the outlets 44B and 46B are different from each other. In addition, both of the discharge directions _d2 and _d7 are also different from the introduction directions _d0 and _d6 of the bleed gas 60 and the cooling gas 61 at the inlets 41A and 42A. In addition, the introduction directions _d0 and _d6 of the bleed gas 60 and the cooling gas 61 are also different from each other. In this way, the introduction directions of the bleed gas 60 and the cooling gas 61 are different from each other, so that the bleed gas 60 and the cooling gas 61 are mixed more uniformly. This makes it possible to further reduce the variations in the properties and temperature of the mixed gas discharged from the outlets 44B and 46B.

In chamber 20B, inlet 41A for introducing bleed gas 60 is provided on surface 40a of main body 40, and inlet 42A for introducing cooling gas 61 is provided on surface 40d of main body 40. When gases having different properties or temperatures are introduced from multiple inlets, it is preferable that at least two of the multiple inlets are provided on opposing surfaces of the main body, such as surface 40a and surface 40d. This makes it easier for the introduced gases to collide with each other, allowing for more uniform mixing. In addition, at least two virtual flow paths of the multiple inlets may overlap each other. This makes it even easier for the introduced gases to collide with each other.

In chamber 20B, outlets 44B, 46B are provided on surfaces 40b, 40c, which are different from surfaces 40a, 40d, on which inlets 41A, 42A are provided. In this way, by providing multiple outlets on surfaces different from the surfaces on which the inlets are provided, it is possible to further suppress uneven flow of gas inside main body 40. In addition, by providing multiple outlets on different surfaces of the main body and/or providing multiple inlets on different surfaces of the main body, it is possible to further suppress uneven flow of gas inside main body 40.

In FIG. 4, there is no dust exhaust pipe for exhausting dust, but in another modified example, a dust exhaust pipe may be connected. In this case, it is preferable to connect the dust exhaust pipe to the surface 40e of the main body 40 and provide a dust exhaust port on the surface 40e. This allows dust that has lost its inertial force due to the collision of the bleed gas 60 and the cooling gas 61 introduced from the opposing inlets 41A and 42A to be smoothly exhausted. From the viewpoint of smoothly exhausting the dust contained in the bleed gas and suppressing the entrainment of dust in the exhausted mixed gas 62, it is preferable to provide the exhaust ports 44B and 46B on a surface (surface 40b and surface 40c as shown in FIG. 4) different from the surface 40e on which the dust exhaust port is provided.

In the above-mentioned example of the chamber, the multiple outlets are all provided on different faces of the main body 40, but this is not limited thereto. For example, at least two of the multiple outlets may be formed on the same face 40f of the main body 40 as shown in FIG. 5. In this case, the angles θ 1 and θ 2 formed by the virtual faces 48a and 49a covering the two outlets 48B and 49B and the center lines of the outlet pipes 48 and 49 connected to the main body 40 and forming the outlets 48B and 49B at the intersections may be different from each other. As a result, the gas outlet directions d ₈ and d ₉ at the outlets 48B and 49B are different from each other. Here, the larger the distance between the outlets _48B and _49B , the more likely the gas flow is to be disturbed in the main body 40. This further promotes the mixing of the gases and the separation of the dust. In addition, from the viewpoint of sufficiently suppressing the short-circuit flow, it is preferable that the face 40f is a face other than the opposing face facing the face on which the inlet is provided.

Figure 6 is a front view showing an example of an obstacle provided inside the main body of the chamber. As shown in (A) and (B) of Figure 6, a baffle plate 70A or 70B may be provided as an obstacle inside the main body 40 of the chamber 20, 20A, 20B. This can promote the mixing of the introduced bleed gas 60 and cooling gas 61, and promote the separation of dust from the bleed gas 60 or mixed gas 62. Each of the baffle plates 70A and 70B has a rectangular outer shape and a plurality of through holes 73. By having such through holes 73, the bleed gas 60 and cooling gas 61 can be repeatedly branched and merged in the main body 40, and the mixing of the two gases can be promoted. It is preferable that the through holes 73 are provided so as not to overlap with the virtual flow path VL of the gas introduced from the inlet. This can sufficiently suppress the short-circuit flow of the introduced gas. The shape of the obstacle is not limited to a plate shape, and may be a columnar member or a rotating member having a rotor.

Figure 8 is a diagram showing a chamber of a comparative example. The chamber 120 has a main body 140 having an internal space through which gas can flow, an inlet pipe 130 connected to the main body 140 for introducing the bleed gas 60 into the main body 140, outlet pipes 132 and 134 connected to the main body 140 for drawing out the bleed gas 63 and 64 from the main body 140, and a dust discharge pipe 136 connected to the main body 140 for discharging dust separated from the bleed gas 60.

An inlet 130A is formed at the connection between the main body 140 and the inlet pipe 130, and outlets 132B and 134B are formed at the connection between the main body 140 and the two outlet pipes 132 and 134, respectively. A dust outlet 136B is formed at the connection between the main body 140 and the dust outlet pipe 136.

The discharge directions _d2 and _d9 of the bleed gases 63, 64 at the outlets 132B and 134B are different from each other. However, the discharge direction _d9 is the same as the introduction direction _d0 of the bleed gas 60 at the inlet 130A (to the right in FIG. 3). In such a chamber 120, it is highly likely that the bleed gas 60 introduced from the inlet 130A will become a short-circuit flow discharged directly from the outlet 132B. Therefore, a drift of the bleed gas 60 occurs in the main body 140, and the amount of dust in the bleed gas 63 discharged from the outlet 132B and the bleed gas 64 discharged from the outlet 134B will be significantly different. In addition, the degree of drift of the bleed gas 60 in the main body 140 is largely dependent on the flow rate of the bleed gas 60 introduced from the inlet 130A. Therefore, the difference in the amount of dust between the extracted gas 63 discharged from the outlet 132B and the extracted gas 64 discharged from the outlet 134B varies depending on the flow rate of the extracted gas 60. This makes it difficult to stably operate the chlorine bypass. In addition, when the cooling gas is introduced, the temperature difference between the extracted gas 63 and the extracted gas 64 varies significantly.

Figure 7 is a diagram showing a cement clinker production facility according to one embodiment. The cement clinker production facility 200 includes a preheating and calcining section 70 that preheats and calcines the cement raw materials, a cement kiln 50 that burns the preheated and calcined cement raw materials to obtain cement clinker, a clinker cooler 80 that cools the cement clinker obtained in the cement kiln 50, and a chlorine bypass facility 100. The preheating and calcining section 70 includes four cyclones C1, C2, C3, and C4 (preheaters) and a calciner 72.

The bottom 52 of the cement kiln 50 and the calciner 72 of the preheating calcination section 70 are connected by a rising duct 51. The connection between the rising duct 51 and the bottom 52 is connected to an extraction pipe 12 of a chlorine bypass equipment 100 that extracts the kiln exhaust gas generated in the cement kiln 50 and recovers the dust contained in the kiln exhaust gas. The extraction pipe 12 is connected to a cooling gas introduction section 10 that introduces a cooling gas along the circumferential direction of the circumferential surface. By providing the chlorine bypass equipment 100, the cement clinker production equipment 200 can reduce the volatile components in the cement clinker production equipment 200.

The cement raw materials introduced from the connection between cyclones C1 and C2 flow through cyclones C1, C2, C3, rising duct 51, calciner 72, and cyclone C4, and are introduced into the kiln end 52 of the cement kiln 50. In the cement kiln 50, the preheated and calcined cement raw materials are heated by combustion in burners 54 installed on the opposite side of the kiln end 52, and become cement clinker. The obtained cement clinker is cooled in the clinker cooler 80. After being cooled by the clinker cooler 80, cement clinker is obtained.

The chlorine bypass equipment 100 of the cement clinker production equipment 200 has a chamber 20. The chamber 20 mixes the bleed gas introduced from the bleed pipe 12 with the cooling gas from the introduction fan 15, and branches the mixed gas into two. The mixed gas branched in the chamber 20 flows sequentially through a heat exchanger 25 and a dust collector 26, respectively. In the chamber 20, dust contained in the mixed gas may be separated. The remaining dust contained in the mixed gas is collected by the dust collector 26.

The chlorine bypass equipment 100 can be operated stably because the fluctuations in the properties and temperature of the mixed gas discharged from the chamber 20 are suppressed. The cement clinker production equipment 200 equipped with such a chlorine bypass equipment 100 can also be operated stably. In this embodiment, the chlorine bypass equipment 100 has the chamber 20, but instead of the chamber 20, it may have a chamber 20A (20B) or a modified version thereof. Alternatively, two extraction pipes 12 may be connected to the rising duct 51 or the kiln butt 52, and the two extraction gases and the cooling gas may be mixed in the chamber and the mixed gas may be branched. Alternatively, two or more cement kilns 50 may be provided, and the extraction gas from the extraction pipes 12 that extract the respective kiln exhaust gases may be introduced into one of the chambers, and two or more extraction gases or two or more extraction gases and the cooling gas may be mixed and branched.

The method for producing cement clinker according to one embodiment can be carried out using a cement clinker production facility 200. This production method includes a preheating and calcining process in which the cement raw materials are preheated and calcined in the preheating and calcining section 70, a firing process in which the preheated and calcined cement raw materials are introduced into the cement kiln 50 from the kiln butt 52 to produce cement clinker, and a recovery process in which at least a portion of the volatile components contained in the kiln exhaust gas generated in the firing process are recovered as dust in the chlorine bypass facility 100. The method may also include a clinker cooling process in which the cement clinker obtained in the firing process is cooled in a clinker cooler 80.

In the preheating and calcining process, the cement raw material is introduced from the flow path between cyclones C1 and C2. The cement raw material is preheated as it flows through cyclones C1, C2, and C3. It is then introduced into the calciner 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 calciner 72 is introduced into cyclone C4 and heated.

In the firing process, the calcined raw materials heated in the cyclone C4 are introduced into the kiln butt 52. They are then fired in the cement kiln 50 to become cement clinker. In the recovery process, the kiln exhaust gas and the cooling gas are mixed in the extraction pipe 12 to produce the extraction gas. This extraction gas is introduced into the chamber 20 and mixed with the cooling gas. In addition, in the chamber 20, the dust contained in the extraction gas is recovered. If this dust contains raw material dust, it may be used as a cement raw material.

In the chamber 20, the mixed gas from which the dust has been removed is branched into two. The branched mixed gas is cooled in two heat exchangers 25. The bleed gas containing dust generated by the cooling is introduced into the dust collectors 26 connected downstream of each heat exchanger 25, and the dust is recovered as chlorine bypass dust. Since the chamber 20 is used in the recovery process in this way, fluctuations in the temperature and properties of the mixed gas (bleed gas) branched in the chamber 20 can be suppressed. Therefore, load fluctuations in the heat exchangers 25 and dust collectors 26, which are provided in multiple systems, are suppressed, and each process can be operated stably.

The above explanations regarding the chlorine bypass equipment 100 and the cement clinker production equipment 200 also apply to the above production method.

Although several embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments, and the configurations of the embodiments and modified examples may be combined or interchanged. The shape of the main body of the chamber is not limited to a cube or rectangular parallelepiped, and may be, for example, a cylindrical shape, a pentagonal prism shape, a square pyramid shape, or a modified shape of these. In addition, the dust discharge section may be provided at the lower end of a mortar-shaped portion formed at the bottom of the main body and tapering downward.

According to the present disclosure, it is possible to provide a chamber capable of stabilizing the operation of a chlorine bypass facility. Furthermore, by providing such a chamber, it is possible to provide a chlorine bypass facility and a cement clinker production facility capable of stable operation. It is also possible to provide a cement clinker production method capable of stably producing cement clinker.

10...cooling gas inlet, 12...extraction pipe, 14, 15...inlet fan, 20...chamber, 25...heat exchanger, 26...dust collector, 28...suction fan, 30, 31, 32, 33, 41, 42...inlet pipe, 30A, 31A, 32A, 33A, 41A, 42A...inlet, 31G, 33G...cylinder, 34, 35, 37, 38, 44, 46, 48, 49...exhaust pipe, 34B, 35B, 37B, 38B, 44B, 46B, 48B, 49B...exhaust port, 36...dust exhaust pipe, 36B...dust exhaust port, 40...main body, 40a, 40b, 40c, 40d, 40e, 40f...surface, 48a, 49a...virtual surface, 50...cement cylinder Run, 51...rising duct, 52...kiln bottom, 54...burner, 60...extraction gas, 61...cooling gas, 62...mixed gas, 63, 64...extraction gas, 65...dust, 70...preheating calcination section, 70A...baffle plate, 70B...baffle plate, 72...calcination furnace, 73...through hole, 80...clinker cooler, 100...chlorine bypass equipment, 120...chamber, 130...inlet pipe, 130A...inlet port, 132, 134...outlet pipe, 132B, 134B...outlet port, 134B...outlet port, 136...dust exhaust pipe, 136B...dust exhaust port, 140...main body, 200...cement clinker manufacturing equipment, C1, C2, C3, C4...cyclone.

Claims (8)

A chamber provided in a chlorine bypass in a cement clinker manufacturing facility, the chamber having a main body portion for branching a plurality of gases,
The body portion has a plurality of inlets for introducing gas and a plurality of outlets for discharging gas,
The gas is discharged in different directions from each other through the plurality of outlets,
an introduction direction of the gas from the plurality of inlets is different from any of the discharge directions of the gas from the plurality of outlets,
A chamber into which the extracted gas and the cooling gas extracted in the cement clinker production facility are respectively introduced through the multiple inlets . The chamber according to claim 1 , wherein a virtual flow path extending in a direction in which the gas is introduced from the plurality of inlets is offset from any of the plurality of outlets. The chamber according to claim 1 or 2, wherein a dust outlet for discharging dust is connected to the main body. The chamber according to any one of claims 1 to 3 , wherein at least one of the plurality of outlet ports is provided at a tip end of a cylinder inserted inside the main body. 5. The chamber according to claim 1, wherein at least one of the plurality of inlets is provided at a tip end of a cylinder inserted inside the main body. A chlorine bypass system comprising a chamber according to any one of claims 1 to 5. The present invention relates to a method for producing a cement kiln using a chlorine bypass system, the method comprising: a preheating and calcining section; a cement kiln; a rising duct; and a chlorine bypass system having an extraction pipe connected to the rising duct and/or the bottom of the cement kiln.
A cement clinker production facility, wherein the chlorine bypass facility comprises a chamber according to any one of claims 1 to 5. A preheating and calcining process for preheating and calcining the cement raw material;
a calcination step of calcining the preheated and calcined cement raw material to produce cement clinker;
A method for producing cement clinker, comprising: a recovery step of recovering at least a portion of the volatile components contained in the kiln exhaust gas generated in the burning step as dust using the chlorine bypass facility according to claim 7.

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