JP7498011B2 - 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.

When small kilns are installed adjacent to each other, it is more efficient to merge the exhaust gases from the multiple kilns and treat them together, rather than providing a chlorine bypass for each kiln. For example, Patent Document 1 proposes a gas merging device equipped with a chamber that merges the bleed gases introduced by multiple gas inlet ducts. Patent Document 1 proposes that the ratio of the distance between the gas inlet duct and the gas outlet duct to the inner diameter of the duct be within a specified range.

JP 2006-137644 A

In a chamber such as that described in Patent Document 1, there is a concern that the introduced gases may not be mixed sufficiently and that a short circuit may occur from the inlet duct to the outlet duct. If such a phenomenon occurs, there is a concern that the properties of the gas discharged from the outlet duct, such as the temperature and dust concentration, 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 facility and is a chamber for merging a plurality of bleed gases in a main body, and includes a first inlet pipe and a second inlet pipe, each of which introduces the bleed gas from an inlet of the main body and has a bent portion upstream of the inlet, and an outlet pipe for outletting a mixed gas including the bleed gas from an outlet of the main body. This chamber is configured such that, downstream of the bend, when a virtual flow path extending in the introduction direction of the bleed gas introduced into the inside of the main body from the inlets of the first inlet pipe and the second inlet pipe is equally divided into an outer flow area and an inner flow area of the bend, at least a part of the outer flow area in the virtual flow path of the first inlet pipe and at least a part of the inner flow area in the virtual flow path of the second inlet pipe collide with each other.

The bleed gas treated in the chlorine bypass facility usually contains dust. The first and second inlet pipes that introduce the bleed gas from the inlet of the main body of the chamber have a bent portion upstream of the inlet. In this bent portion, a distribution of dust concentration is generated in the bleed gas due to centrifugal force generated by the flow of the bleed gas. That is, when the dust flows through the bent portion, the dust concentration is higher in the portion flowing outside the bent portion than in the portion flowing inside. Here, in the above chamber, at least a part of the outer flow area in the virtual flow path of the first inlet pipe and at least a part of the inner flow area in the virtual flow path of the second inlet pipe are configured to collide with each other. Therefore, the outer flow area with a high dust concentration and the inner flow area with a low dust concentration collide within the main body of the chamber. Therefore, the uniformity of the dust concentration in the mixed gas generated in the main body can be improved, and the variation in the dust concentration of the mixed gas drawn out from the lead-out pipe can be suppressed. In addition, since the gases collide with each other within the main body of the chamber, the temperature of the mixed gas is also uniformized. This suppresses fluctuations in the properties of the mixed gas caused by poor mixing, and stabilizes the operation of the chlorine bypass equipment.

In the above chamber, the bleed gas may be introduced from the first and second inlet pipes in opposing directions into the main body, and the bleed gas may be introduced from the first and second inlet pipes so that the equalizing lines that equally divide the outer flow area and the inner flow area intersect at the collision surface where the virtual flow paths in the main body collide. This sufficiently increases the mixing efficiency due to the collision of the bleed gases introduced from the first and second inlet pipes, and further improves the uniformity of the dust concentration in the mixed gas. Therefore, the variation in dust concentration of the mixed gas discharged from the discharge pipe can be further suppressed, and the operation of the chlorine bypass equipment can be sufficiently stabilized.

In this disclosure, a "virtual flow path" is a three-dimensional virtual flow path that occupies a part of the internal space of the main body and extends from the bleed gas inlet in the direction of introduction into the main body. If the opening edge of the inlet is circular, the virtual flow path is cylindrical. If the opening edge of the inlet is rectangular, the virtual flow path is square prism-shaped. In this disclosure, a "collision surface" is a surface where virtual flow paths collide with each other, and is therefore virtual. The collision surface where the bleed gases actually collide with each other may be shifted from the virtual collision surface, and the bleed gases do not actually have to collide with each other in a planar manner.

In this disclosure, "equal division" means dividing the virtual flow path in two along the flow direction so that the cross-sectional area of the virtual flow path (a cut surface perpendicular to the flow direction) is equal. When the virtual flow path is a straight pipe, if this virtual flow path is equally divided into an outer flow area and an inner flow area, the outer flow area and the inner flow area each have a semi-cylindrical shape. However, the opening edge of the inlet is not limited to a circular shape, and the virtual flow path is not limited to a cylindrical shape.

In the above-mentioned chamber, the virtual flow paths from the first and second inlet pipes, which are respectively connected to the opposing surfaces of the main body, may be configured to be offset from each other along the in-plane direction of the opposing surfaces, and at least a portion of the outer flow area of one virtual flow path may collide with at least a portion of the inner flow area of the other virtual flow path. Even with such a configuration, the uniformity of the dust concentration in the mixed gas in the main body is improved, and the variation in the dust concentration of the mixed gas discharged from the discharge pipe can be suppressed. In addition, since the gases collide with each other within the main body of the chamber, the temperature of the mixed gas is also uniformized. Note that in this disclosure, the in-plane direction means any direction included in that surface.

In the above chamber, at the collision section where the virtual flow paths from the first and second inlet pipes collide to cross each other, the outer flow area of one virtual flow path and the inner flow area of the other virtual flow path may collide to merge. This improves the uniformity of the dust concentration in the mixed gas generated in the main body, and suppresses the variation in the dust concentration of the mixed gas discharged from the discharge pipe.

The virtual flow paths from the first inlet pipe and the second inlet pipe may both be offset from the outlet. This prevents the bleed gas from being discharged from the outlet without being sufficiently mixed, which is known as a short-circuit flow. This prevents the dust concentration in the mixed gas from varying over time.

The main body may have an inlet for introducing a cooling gas. This allows the bleed gas to be not only mixed but also cooled in the chamber. In addition, the main body can sufficiently mix the introduced gases, so that the properties and temperature of the mixed gas can be prevented from fluctuating even when a cooling gas is introduced.

A dust outlet for discharging dust contained in the bleed gas may be connected to the main body. This reduces the load on the dust collection equipment provided downstream of the chamber.

The chlorine bypass equipment according to one aspect of the present disclosure includes any one of the chambers described above. This allows the chlorine bypass to be operated stably. In addition, since multiple bleed gases can be introduced from the inlet, the bleed gas can be efficiently treated.

The cement clinker production equipment 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 equipment having an extraction pipe connected to the rising duct and/or the bottom of the cement kiln. This cement clinker production equipment can be operated stably because it includes a chlorine bypass equipment having any of the above-mentioned chambers. In addition, the above-mentioned chlorine bypass equipment can introduce multiple extraction gases from the inlets of the chambers, so the extraction gases can be treated stably and efficiently. Therefore, the cement clinker production equipment can be operated stably, and the production efficiency of cement clinker can be improved.

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 the dust to be processed stably and efficiently, stabilizing each process and enabling cement clinker to be produced stably and efficiently.

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. 3 is a front view of the chamber of FIG. 2 . FIG. 3 is a right side view of the chamber of FIG. 2 . FIG. 13 is a diagram showing another example of a chamber provided in the chlorine bypass facility. FIG. 6 is a front view of the chamber of FIG. FIG. 6 is a right side view of the chamber of FIG. FIG. 2 is a diagram showing a collision surface CR. FIG. 13 is a diagram showing yet another example of a chamber provided in the chlorine bypass facility. FIG. 10 is a front view of the chamber of FIG. FIG. 10 is a right side view of the chamber of FIG. 10 is a diagram showing the relationship between the virtual flow path and the collision surface when the main body of the chamber in FIG. 9 is viewed from above. FIG. FIG. 13 is a diagram showing yet another example of a chamber provided in the chlorine bypass facility. FIG. 14 is a front view of the chamber of FIG. 13. FIG. 13 is a diagram showing yet another example of a chamber provided in the chlorine bypass facility. FIG. 16 is a front view of the chamber of FIG. 16 is a diagram showing the relationship between the virtual flow path and the collision portion when the main body of the chamber in FIG. 15 is viewed from above. FIG. FIG. 1 is a diagram showing a cement clinker production facility according to an embodiment.

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 and 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 multiple extraction pipes 12, a heat exchanger 25 that cools the mixed gas to below the melting point of the volatile alkali salt, a dust collector 27 that separates dust (chlorine bypass dust) contained in the extraction gas that precipitates as it cools from the extraction gas, and a suction fan 29 that extracts the extraction gas through the chamber 20, the heat exchanger 25, and the dust collector 27. The extraction pipe 12 may be what is called an extraction probe. Examples of the suction fan 29 include ordinary suction fans such as a sirocco fan and a turbo fan.

The cement clinker manufacturing equipment 200 is equipped with two cement kilns 50 and a kiln butt 52 and a rising duct 51 connected thereto. For this reason, the chlorine bypass equipment 100 is configured so that the extraction gas is introduced from the two extraction pipes 12 into the chamber 20. The two extraction pipes 12 are each provided with a cooling gas inlet 10. The cooling gas inlet 10 is supplied with cooling gas from an introduction fan 14. The cooling gas inlet 10 introduces the cooling gas into the extraction pipe 12. The cooling gas may be air at room temperature, or may include exhaust gas generated in a factory or the like. Examples of the exhaust gas include odorous gas generated during the reception, storage and fermentation of water-containing sludge such as sewage sludge brought into the cement manufacturing factory, exhaust gas discharged from the suction fan 29 and the suction fan of other processes, etc.

In the chamber 20, the two bleed gases are mixed. The mixed gas (bleed gas) obtained in the chamber 20 flows sequentially through the heat exchanger 25 and the dust collector 27. Dust may be discharged from a dust outlet of the chamber 20. The remaining dust contained in the bleed gas is collected by the dust collector 27. The dust collector 27 may be a bag filter or a wet dust collector such as a wet scrubber. Dust does not have to be discharged in the chamber 20. Also, a classifier may be provided upstream or downstream of the dust collector 27 in addition to the dust collector 27.

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 for joining and mixing a plurality of bleed gases 61, 62, two inlet pipes 31, 32 (first inlet pipe 31, second inlet pipe 32) connected to the faces 40a, 40b of the main body 40 and for introducing the bleed gases 61, 62 into the main body 40, and an outlet pipe 45 connected to the face 40c of the main body 40 and for discharging the gas mixed in the main body 40 from the main body 40. In addition to the above-mentioned inlet pipes and outlet pipes, an inlet pipe for introducing a cooling gas for cooling the bleed gas, and/or a dust discharge pipe for discharging dust separated from the bleed gas may be connected to the main body.

At the connection between the main body 40 and the two inlet pipes 31, 32, inlet ports 31A, 32A are formed, respectively, and at the connection between the main body 40 and the outlet pipe 45, an outlet port 45B is formed. That is, the chamber 20 has the inlet port 31A, the inlet port 32A, and the outlet port 45B in the main body 40. The two inlet pipes 31, 32 have bent portions 31C, 32C on the upstream side of the inlet port 31A, the inlet port 32A, respectively. The bent portions 31C, 32C are bent in an elbow shape along the flow direction of the bleed gas 61, 62. The upstream side of the bent portions 31C, 32C of the inlet pipes 31, 32 is connected to, for example, the bleed pipe 12. The bend angle at the bent portions 31C, 32C is 90°. However, this angle is not particularly limited and may be, for example, 30 to 150°, 45 to 135°, or 60 to 120°.

The bleed gases 61, 62 flowing through the inlet pipes 31, 32 pass through the bent portions 31C, 32C, and are then introduced into the main body 40 from the inlets 31A, 32A, respectively. The bleed gases 61, 62 introduced into the main body 40 join and mix in the main body 40. The mixed gas (bleed gas) obtained by mixing is discharged from the outlet 45B to the discharge pipe 45. Dust contained in the bleed gases 61, 62 is entrained in the mixed gas 64 and discharged from the outlet 45B. The mixed gas 64 discharged from the outlet 45B may be introduced, for example, into the heat exchanger 25 in FIG. 1.

The virtual flow path _VL1 extends in the introduction direction of the bleed gas 61 introduced from the inlet 31A into the inside of the main body 40 downstream of the bent portion 31C of the inlet pipe 31. The virtual flow path _VL2 extends in the introduction direction of the bleed gas 62 introduced from the inlet 32A into the inside of the main body 40 downstream of the bent portion 32C of the inlet pipe 32. The inlet 31A provided on the surface 40a and the inlet 32A provided on the surface 40b face each other, and the virtual flow paths _VL1 and _VL2 extend in directions opposite each other. Therefore, the virtual flow paths _VL1 and _VL2 collide head-on within the main body 40.

Figure 3 is a front view of the chamber 20, and Figure 4 is a right side view of the chamber 20. The inlets 31A and 32A are formed in the center of the faces 40a and 40b of the main body 40. Therefore, when the flow rates of the bleed gas 61 introduced from the inlet 31A and the bleed gas 62 introduced from the inlet 32A are the same, the collision surface CR where the two collide occurs in the center of the main body 40.

When the bleed gases 61, 62 flowing through the inlet pipe 31 pass through the bent portion 31C, centrifugal force causes solid dust to move toward the outside of the flow path, and the dust concentration is higher on the outside than on the inside of the flow path. For this reason, if the virtual flow path _VL1 extending from the inlet 31A in the introduction direction of the bleed gas 61 is equally divided into an outer flow area _HF1 and an inner flow area _LF1 , the dust concentration is higher in the outer flow area _HF1 than in the inner flow area _LF1 . On the other hand, if the virtual flow path _VL2 extending from the inlet 32A in the introduction direction of the bleed gas 62 is equally divided into an outer flow area _HF2 and an inner flow area _LF2 , the dust concentration is higher in the outer flow area _HF2 than in the inner flow area _LF2 .

3 and 4, the inlet pipes 31 and 32 are bent in opposite directions with the main body 40 in between. Therefore, as shown in Fig. 3, the positional relationship between the outer flow region _HF1 and the inner flow region _LF1 in the virtual flow path _VL1 is reversed to the positional relationship between the outer flow region _HF2 and the inner flow region _LF2 in the virtual flow path _VL2 . In Fig. 4, the outer flow region _HF1 in the virtual flow path _VL1 is located on the near side, and the inner flow region _{LF2 in the virtual flow path VL2 is} located on the near side.

3, the boundary surface _VD1 between _{the outer flow region HF1 and the inner flow region LF1 in the virtual flow channel VL1 and the boundary surface VD2 between the outer} flow region _HF2 and the inner flow region _LF2 in the virtual flow channel _VL2 are connected to form a single plane. At the collision surface CR, the outer flow region _HF1 in the virtual flow channel _VL1 collides with the inner flow region _LF2 in the virtual flow channel _VL2 , and the inner flow region _LF1 in the virtual flow channel _VL1 collides with the outer flow region _HF2 in the virtual flow channel VL2. At the collision surface CR, _{the equator forming one side of the boundary surface VD1 between} the outer flow region _HF1 and the inner flow region _LF1 in the virtual flow channel VL1 collides with the equator forming one side of _the boundary surface _VD2 between the outer flow region _HF2 and the inner flow region _LF2 in the virtual flow channel _VL2 so as to be aligned with each other.

In this example, even if the dust concentrations of the bleed gases 61 and 62 are different, the unevenness of the dust in the mixed gas generated by the merging of the bleed gases 61 and 62 in the main body 40 is sufficiently suppressed. Therefore, the uniformity of the dust concentration of the mixed gas is improved, and the variation in the dust concentration of the mixed gas 64 discharged from the discharge pipe 45 can be sufficiently suppressed. In addition, since the bleed gases 61 and 62 collide with each other in the main body 40 of the chamber 20, the uniformity of the temperature of the mixed gas 64 is also promoted. Therefore, the property fluctuation of the mixed gas 64 due to poor mixing can be suppressed, and the operation of the chlorine bypass equipment 100 can be stabilized. Each inlet pipe may have multiple bends. In this case, the boundary surface between the inner flow area and the outer flow area is defined by the bend adjacent to the inlet.

Figure 5 is a diagram showing another example of a chamber provided in a chlorine bypass facility. The chamber 22 has a main body 40 having an internal space where multiple bleed gases 61, 62 are joined and mixed, two inlet pipes 33, 34 (a first inlet pipe 33 and a second inlet pipe 34) connected to the faces 40a, 40b of the main body 40 and introducing the bleed gases 61, 62 into the main body 40, and an outlet pipe 45 connected to the face 40c of the main body 40 and leading the gas mixed in the main body 40 out of the main body 40.

Inlet ports 33A and 34A are formed at the connection between the main body 40 and the two inlet pipes 33 and 34, respectively, and outlet port 45B is formed at the connection between the main body 40 and the outlet pipe 45. That is, the chamber 22 has the inlet port 33A, the inlet port 34A, and the outlet port 45B in the main body 40. The two inlet pipes 33 and 34 have bent portions 33C and 34C on the upstream side of the inlet port 33A and the inlet port 34A, respectively. The bent portions 33C and 34C are bent in an elbow shape along the flow direction of the bleed gases 61 and 62. The upstream side of the bent portions 33C and 34C of the inlet pipes 33 and 34 is connected to, for example, the bleed pipe 12.

The bleed gases 61, 62 flowing through the inlet pipes 33, 34 pass through the bent portions 33C, 34C, and are then introduced into the main body 40 from the inlets 33A, 34A, respectively. The bleed gases 61, 62 introduced into the main body 40 join and mix in the main body 40. The mixed gas (bleed gas) obtained by mixing is discharged from the outlet 45B to the discharge pipe 45. Dust contained in the bleed gases 61, 62 is discharged entrained in the mixed gas from the outlet 45B.

The virtual flow path _VL3 extends downstream of the bent portion 33C of the inlet pipe 33 in the introduction direction of the bleed gas 61 introduced from the inlet 33A into the inside of the main body 40. The virtual flow path _VL4 extends downstream of the bent portion 34C of the inlet pipe 34 in the introduction direction of the bleed gas 62 introduced from the inlet 34A into the inside of the main body 40. The inlet 33A provided on the surface 40a and the inlet 34A provided on the surface 40b face each other, and the virtual flow paths _VL3 and _VL4 extend in directions opposite each other. Therefore, the virtual flow paths _VL3 and _VL4 collide head-on within the main body 40.

6 is a front view of the chamber 22, and FIG. 7 is a right side view of the chamber 22. When the flow velocities of the bleed gas 61 introduced from the inlet 33A and the bleed gas 62 introduced from the inlet 34A are the same, a collision surface CR where the two collide occurs at the center of the main body 40. When the virtual flow path _VL3 extending from the inlet 33A in the introduction direction of the bleed gas 61 is equally divided into an outer flow area _HF3 and an inner flow area _LF3 , the dust concentration in the outer flow area _HF3 is higher than that in the inner flow area _LF3 due to the centrifugal force at the bent portion 33C. On the other hand, when the virtual flow path _VL4 extending from the inlet 34A in the introduction direction of the bleed gas 62 is equally divided into an outer flow area _HF4 and an inner flow area _LF4 , the dust concentration in the outer flow area _HF4 is higher than that in the inner flow area _LF4 .

5, 6 and 7, the pipe portions upstream of the bent portions 33C and 34C of the introduction pipes 33 and 34 are in a so-called twisted relationship. Therefore, as shown in Fig. 6 and 7, the arrangement of the outer flow region _HF3 and the inner flow region _LF3 in the virtual flow path _VL3 and the arrangement of the outer flow region _HF4 and the inner flow region _{LF4 in the virtual flow path VL4 are} shifted by an angle of 90° along the circumferential direction of the virtual flow paths _VL3 and _VL4 . Therefore, the boundary surface _VD3 between the outer flow region _HF3 and the inner flow region _{LF3 and} the boundary surface _VD4 between the outer flow region _HF4 and the inner flow region _LF4 are perpendicular to each other at the collision surface CR.

8 is a diagram showing the collision surface CR. As shown in this figure, in this example, the equator LD ₃ , which is the intersection line between the collision surface CR and the boundary surface VD ₃ , and the equator LD ₄ , which is the intersection line between the collision surface CR and the boundary surface VD 4 _{, are perpendicular to each other. That is, in the collision surface CR, the equator LD 3 that} equates the outer flow area HF ₃ and the inner flow area LF ₃ are perpendicular to the equator LD ₄ that equates the outer flow area HF ₄ and the inner flow area LF _4. Therefore, in 1/4 of the entire area of the collision surface CR, the inner flow areas LF ₃ and LF ₄ collide with each other, and in another 1/4 of the area, the outer flow areas HF ₃ and HF ₄ collide with each other. Then, in the remaining 1/2 of the area, the inner flow area LF ₃ (LF ₄ ) and the outer flow area HF ₄ (HF ₃ ) collide with each other. In this way, even if parts of the inner flow area and the outer flow area collide with each other, the uniformity of the dust concentration in the mixed gas generated within the main body 40 can be improved, and the variation in the dust concentration of the mixed gas 64 discharged from the discharge pipe 45 can be sufficiently suppressed.

The angle θ between the equator _LD3 and the equator _LD4 is not limited to 90°, and may be 150° or less, 135° or less, or 90° or less. The angle θ is the angle of a sector that is a region where the inner flow region _LF3 and the inner flow region _LF4 collide. When the angle θ becomes 0°, the inner flow region and the outer flow region collide over the entire collision surface CR, as in the examples shown in Figures 2 to 4. By bringing the angle θ closer to 0°, the variation in dust concentration of the mixed gas 64 can be further reduced.

Figure 9 is a diagram showing yet another example of a chamber provided in a chlorine bypass facility. The chamber 24 has a main body 40 having an internal space where multiple bleed gases 61, 62 are joined and mixed, two inlet pipes 31, 34 (first inlet pipe 31, second inlet pipe 34) connected to the faces 40a, 40b of the main body 40 and introducing the bleed gases 61, 62 into the main body 40, and an outlet pipe 45 connected to the face 40f of the main body 40 and leading the gas mixed in the main body 40 out of the main body 40.

At the connection between the main body 40 and the two inlet pipes 31, 34, inlet ports 31A, 34A are formed, respectively, and at the connection between the main body 40 and the outlet pipe 45, an outlet port 45B is formed. The inlet pipes 31, 34 are connected to the opposing surfaces 40a, 40b of the main body 40. That is, the chamber 24 has the inlet port 31A, the inlet port 34A, and the outlet port 45B in the main body 40, and the inlet port 31A and the inlet port 34A are formed on the opposing surfaces 40a, 40b. The two inlet pipes 31, 34 have bent portions 31C, 34C on the upstream side of the inlet port 31A and the inlet port 34A, respectively. The bent portions 31C, 34C are bent in an elbow shape along the flow direction of the bleed gas 61, 62. The upstream side of the bent portions 31C, 34C of the inlet pipes 31, 34 is connected to, for example, the bleed pipe 12.

The bleed gases 61, 62 flowing through the inlet pipes 31, 34 pass through the bent portions 31C, 34C, and are then introduced into the main body 40 from the inlets 31A, 34A, respectively. The bleed gases 61, 62 introduced into the main body 40 join and mix in the main body 40. The mixed gas (bleed gas) obtained by mixing is discharged from the outlet 45B to the discharge pipe 45. Dust contained in the bleed gases 61, 62 is entrained in the mixed gas 64 and discharged from the outlet 45B.

The virtual flow path _VL1 extends downstream of the bent portion 31C of the inlet pipe 31 in the introduction direction of the bleed gas 61 introduced from the inlet 31A into the inside of the main body 40. The virtual flow path _VL4 extends downstream of the bent portion 34C of the inlet pipe 34 in the introduction direction of the bleed gas 62 introduced from the inlet 34A into the inside of the main body 40. The inlet 31A provided on the surface 40a and the inlet 34A provided on the surface 40b are shifted along a direction perpendicular to the introduction direction of the bleed gases 61, 62 at the inlets 31A, 34A. As a result, the virtual flow paths _VL1 and _VL4 collide with each other in a shifted state along the in-plane direction of the opposing surfaces 40a, 40b. Therefore, the virtual flow paths _VL1 and _VL4 do not collide head-on, but a part of the tip of the virtual flow path _VL1 and a part of the tip of the virtual flow path _VL4 collide with each other to form a collision surface CR.

10 is a front view of the chamber 24, and FIG. 11 is a right side view of the chamber 24. As shown in FIG. 10 and FIG. 11, the introduction pipe 31 and the introduction pipe 34 are bent in the same direction with the main body 40 in between. Therefore, as shown in FIG. ₁₀ , the positional relationship between the outer flow area HF ₁ and the inner flow area LF ₁ in the virtual flow path VL 1 is the same as the positional relationship between the outer flow area HF ₄ and the inner flow area LF ₄ in the virtual flow path VL _4. That is, the boundary surface VD ₁ between the outer flow area HF ₁ and the inner flow area LF ₁ and the boundary surface VD ₄ between the outer flow area HF ₄ and the inner flow area LF ₄ in the virtual flow path VL ₄ are in a parallel positional relationship. In FIG. 11, in both the virtual flow paths VL _{1 and} VL ₄ , the outer flow areas HF _{1 and} HF ₄ are located on the front side, and the inner flow areas LF _{1 and} LF ₄ are located on the back side of the paper.

12 is a diagram showing the relationship between the virtual flow paths VL ₁ and VL ₄ and the collision surface CR when the main body 40 of the chamber 24 is viewed from above. As shown in this figure, in this example, the collision surface CR is sandwiched between the equator LD ₁ constituting the boundary surface VD ₁ and the equator LD ₄ constituting the boundary surface VD _4. That is, in a plane including the collision surface CR, the equator LD ₁ that equates the outer flow region HF ₁ and the inner flow region LF ₁ is parallel to the equator LD ₄ that equates the outer flow region HF ₄ and the inner flow region LF _4. At the collision surface CR in the main body 40, a part of the inner flow region LF ₁ in the virtual flow path VL ₁ collides with a part of the outer flow region HF ₄ in the virtual flow path VL ₄ . This improves the uniformity of the dust concentration in the mixed gas generated when the bleed gases 61, 62 join together in the main body 40, even if the dust concentrations of the bleed gases 61, 62 are different. Therefore, it is possible to suppress the variation in the dust concentration of the mixed gas 64 led out from the lead-out pipe 45.

In this example, the inlet pipes 31 and 34 are bent in the same direction at the bent portions 31C and 34C. Therefore, even if the two inlet pipes cannot be bent in different directions as in the example of Fig. 2 or 5 due to restrictions on the installation location, for example, it is possible to suppress variations in the dust concentration of the mixed gas 64. Furthermore, since there is no outlet pipe 45 on the plane where the virtual flow path _VL1 of the inlet pipe 31 and the virtual flow path _VL4 of the inlet pipe 34 are extended, the mixing of the gases can be further promoted by complicating the gas flow.

Figure 13 is a diagram showing yet another example of a chamber provided in a chlorine bypass facility. The chamber 26 has a main body 40 having an internal space in which multiple bleed gases 61, 62 are joined and mixed, two inlet pipes 31, 36 (a first inlet pipe 31 and a second inlet pipe 36) connected to the faces 40a, 40d of the main body 40 and introducing the bleed gases 61, 62 into the main body 40, and an outlet pipe 45 connected to the face 40e of the main body 40 and leading the gas mixed in the main body 40 out of the main body 40.

Inlet ports 31A and 36A are formed at the connection between the main body 40 and the two inlet pipes 31 and 36, respectively, and outlet port 45B is formed at the connection between the main body 40 and the outlet pipe 45. That is, the chamber 26 has the inlet port 31A, the inlet port 36A, and the outlet port 45B in the main body 40. The two inlet pipes 31 and 36 have bent portions 31C and 36C on the upstream side of the inlet port 31A and the inlet port 36A, respectively. The bent portions 31C and 36C are bent in an elbow shape along the flow direction of the bleed gases 61 and 62. The upstream side of the bent portions 31C and 36C of the inlet pipes 31 and 36 are connected to, for example, the bleed pipe 12.

The bleed gases 61, 62 flowing through the inlet pipes 31, 36 pass through the bent portions 31C, 36C, and are then introduced into the main body 40 from the inlets 31A, 36A, respectively. The bleed gases 61, 62 introduced into the main body 40 join and mix in the main body 40. The mixed gas 64 (bleed gas) obtained by mixing is discharged from the outlet 45B to the discharge pipe 45. Dust contained in the bleed gases 61, 62 is discharged entrained in the mixed gas 64 from the outlet 45B.

The virtual flow path _VL1 extends in the introduction direction of the bleed gas 61 introduced from the introduction port 31A into the inside of the main body 40, downstream of the bent portion 31C of the introduction pipe 31. The virtual flow path _VL6 extends in the introduction direction of the bleed gas 62 introduced from the introduction port 36A into the inside of the main body 40, downstream of the bent portion 36C of the introduction pipe 36. The virtual flow paths _VL1 and _VL6 intersect at right angles within the main body 40.

14 is a front view of the chamber 26. In the virtual flow path VL ₁ extending from the inlet 31A along the introduction direction of the bleed gas 61, the outer flow area HF ₁ is on the surface 40c side (the outlet 45B side), and the inner flow area LF ₁ is on the surface 40d side (the inlet 36A side). Therefore, the virtual flow path VL ₆ extending from the inlet 36A along the introduction direction of the bleed gas 62 collides with the inner flow area LF ₁ so as to merge. Since the outer flow area HF ₆ and the inner flow area LF ₁ collide with each other so as to merge at this collision portion CR ₀ , the uniformity of the dust concentration in the mixed gas generated in the main body 40 can be improved, and the variation in the dust concentration of the mixed gas 64 drawn out from the outlet pipe 45 shown in FIG. 13 can be suppressed. Note that the "collision portion" in the present disclosure is a virtual portion since it is a portion where the virtual flow paths collide with each other. The portion where the bleed gases actually collide with each other may be shifted from the virtual collision portion.

In this example, it is not necessary to connect the inlet pipes 31 and 36 to the opposing surfaces of the main body 40. Therefore, even if it is not possible to connect two inlet pipes to the opposing surfaces of the main body 40 as in the example of FIG. 2 or FIG. 5 due to restrictions on the installation location, for example, the variation in dust concentration of the mixed gas 64 can be suppressed. Furthermore, since there is no outlet pipe 45 on the surface to which the virtual flow path VL ₁ of the inlet pipe 31 and the virtual flow path VL ₆ of the inlet pipe 36 are extended, the mixing of the gases can be further promoted by making the gas flow more complicated. In addition, for example, a dust outlet may be provided on the lower surface 40b of the main body 40 so that dust entrained in the bleed gases 61 and 62 can be discharged. In this example, the virtual flow path VL ₁ and the virtual flow path VL ₆ are perpendicular to each other, but the angle at which the virtual flow paths intersect is not limited to 90°.

Figure 15 is a diagram showing yet another example of a chamber provided in a chlorine bypass facility. The chamber 28 has a main body 40 having an internal space where multiple bleed gases 61, 62 are joined and mixed, two inlet pipes 31, 38 (a first inlet pipe 31 and a second inlet pipe 38) connected to the faces 40a, 40d of the main body 40 and introducing the bleed gases 61, 62 into the main body 40, and an outlet pipe 45 connected to the face 40c of the main body 40 and leading the gas mixed in the main body 40 out of the main body 40.

Inlet ports 31A and 38A are formed at the connection between the main body 40 and the two inlet pipes 31 and 38, respectively, and outlet port 45B is formed at the connection between the main body 40 and the outlet pipe 45. That is, the chamber 28 has the inlet port 31A, the inlet port 38A, and the outlet port 45B in the main body 40. The two inlet pipes 31 and 38 have bent portions 31C and 38C on the upstream side of the inlet port 31A and the inlet port 38A, respectively. The bent portions 31C and 38C are bent in an elbow shape along the flow direction of the bleed gases 61 and 62. The upstream side of the bent portions 31C and 38C of the inlet pipes 31 and 38 is connected to, for example, the bleed pipe 12.

The bleed gases 61, 62 flowing through the inlet pipes 31, 38 pass through the bent portions 31C, 38C, and are then introduced into the main body 40 from the inlets 31A, 38A, respectively. The bleed gases 61, 62 introduced into the main body 40 join and mix in the main body 40. The mixed gas 64 (bleed gas) obtained by mixing is discharged from the outlet 45B to the discharge pipe 45. Dust contained in the bleed gases 61, 62 is discharged entrained in the mixed gas 64 from the outlet 45B.

The virtual flow path _VL1 extends in the introduction direction of the bleed gas 61 introduced from the introduction port 31A into the inside of the main body 40, downstream of the bent portion 31C of the introduction pipe 31. The virtual flow path _VL8 extends in the introduction direction of the bleed gas 62 introduced from the introduction port 38A into the inside of the main body 40, downstream of the bent portion 38C of the introduction pipe 38. The virtual flow paths _VL1 and _VL8 intersect at right angles within the main body 40.

16 is a front view of the chamber 28. In the virtual flow path _VL1 extending from the inlet 31A along the introduction direction of the bleed gas 61, the outer flow area _HF1 is on the surface 40c side (the outlet 45B side), and the inner flow area _LF1 is on the surface 40d side (the inlet 38A side). Therefore, the virtual flow path _VL8 extending from the inlet 38A along the introduction direction of the bleed gas collides with the inner flow area _LF1 so as to merge with it.

17 is a diagram showing the relationship between the virtual flow paths _VL1 , _VL8 and the collision portion _CR0 when the main body 40 of the chamber 28 is viewed from above. In the collision portion _CR0 in the main body 40, a part of the inner flow region _LF1 in the virtual flow path _VL1 and a part of the outer flow region _HF8 in the virtual flow path _VL8 collide so as to join at the collision portion _CR0 (the upper left diagonal portion _of the circular virtual flow path VL1). This can improve the uniformity of the dust concentration in the mixed gas generated by joining the bleed gases 61, 62 in the main body 40 even if the dust concentrations of the bleed gases 61, 62 are different. Therefore, it is possible to suppress the variation in the dust concentration of the mixed gas 64 led out from the lead-out pipe 45.

In this example, the upstream portions of the bent portions 31C, 38C of the inlet pipes 31, 38 are in a so-called twisted relationship. Therefore, even if the two inlet pipes cannot be bent in different directions as in the example of Fig. 13 due to restrictions on the installation location, for example, it is possible to suppress variation in the dust concentration of the mixed gas 64. In addition, for example, a dust outlet may be provided on the lower surface 40b of the main body 40 so that dust entrained in the bleed gases 61, 62 can be discharged. Note that, in this example, the virtual flow paths _VL1 and _VL8 are perpendicular to each other, but the angle at which the virtual flow paths intersect is not limited to 90°.

Although the above-mentioned chambers 20, 22, 24, 26, and 28 each have two gas inlets and one gas outlet, this is not limiting. For example, the chambers may have three or more gas inlets. In this case, by making the outer flow area and the inner flow area collide in at least two of the three or more inlets, the variation in dust concentration of the mixed gas discharged from the discharge pipe can be reduced.

In the above-mentioned chambers 20, 22, 24, 26, and 28, the two inlets have the same shape and size, and the flow rate (flow speed) of the bleed gas introduced from the two inlets is the same, but this is not limited to the above. For example, even if the flow speed of the bleed gas at the two inlets differs from each other and the position of the collision surface (collision portion) changes, the variation in the dust concentration of the mixed gas drawn out from the outlet pipe can be reduced.

Figure 18 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. Near the connection between the rising duct 51 and the bottom 52, an extraction pipe 12 of a chlorine bypass equipment 100 is connected, which extracts the kiln exhaust gas generated in the cement kiln 50 and recovers the dust contained in the kiln exhaust gas. A cooling gas introduction section 10 that introduces a cooling gas along the circumferential direction of the extraction pipe 12 is connected to the extraction pipe 12. 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 bleed gas extracted by the bleed pipe 12 is introduced into the chamber 20. The bleed gas is introduced into the chamber 20 from an bleed pipe connected to the bottom of a cement kiln, a rising duct, or a connection thereto, of a system separate from the cement kiln 50. Even if the temperatures and dust concentrations of the bleed gases introduced from the two bleed pipes 12 are different, a mixed gas with suppressed fluctuations in temperature and dust concentration is discharged from the chamber 20.

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.

Since the cement clinker production facility 200 includes the chlorine bypass facility 100 having the chamber 20, the chlorine bypass facility 100 and the cement clinker production facility 200 can be operated stably. In this embodiment, the chlorine bypass facility 100 includes the chamber 20, but instead of the chamber 20, the facility may include the chambers 22, 24, 26, 28 or modified versions thereof. In addition, two extraction pipes 12 may be connected to the rising duct 51 or the kiln butt 52, and the two extraction gases may be mixed by the chamber 20 (22, 24, 26, 28). In addition, the cooling gas may be introduced directly into the chamber 20.

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.

The bleed gas from which dust has been removed in chamber 20 is cooled in heat exchanger 25. The bleed gas containing dust resulting from the cooling is introduced into dust collector 27, and the dust is recovered as chlorine bypass dust. Using chamber 20 in this way in the recovery process makes it possible to suppress fluctuations in the temperature and properties of the bleed gas (mixed gas) flowing out downstream of chamber 20. Therefore, load fluctuations in heat exchanger 25 and dust collector 27 are suppressed, allowing each process to 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 replaced. The shape of the main body of the chamber is not limited to a cube or rectangular parallelepiped shape, and may be, for example, a cylindrical shape, a pentagonal prism shape, or a square pyramid shape. In addition, the dust exhaust port may be provided at the bottom end of a bowl-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 portion, 12...extraction pipe, 14...inlet fan, 20, 22, 24, 26, 28...chamber, 25...heat exchanger, 27...dust collector, 29...suction fan, 31, 32, 33, 34, 36, 38...inlet pipes, 31A, 32A, 33A, 34A, 36A, 38A...inlet port, 31C, 32C, 33C, 34C, 36C, 38C...bent portion, 40...main body portion , 40a, 40b, 40c, 40d, 40e, 40f...surfaces, 45...exhaust pipe, 45B...exhaust port, 50...cement kiln, 51...rising duct, 52...kiln bottom, 54...burner, 61, 62...extracted gas, 64...mixed gas, 70...preheating calcination section, 72...calciner furnace, 80...clinker cooler, 100...chlorine bypass equipment, 200...cement clinker manufacturing equipment, _VD1 , _VD2 , _VD3 , _VD4 ...boundary surfaces, _VL1 , _VL2 , _VL3 , _VL4 , _VL6 , _VL8 ...virtual flow paths, _LD1 , _LD3 , _LD4 ...equalizer lines.

Claims (11)

A chamber provided in a chlorine bypass facility for joining a plurality of bleed gases in a main body,
a first inlet pipe and a second inlet pipe each introducing the bleed gas from an inlet of the main body and each having a bent portion on an upstream side of the inlet;
an outlet pipe that outputs a mixed gas containing the bleed gas from an outlet of the main body,
When a virtual flow path extending in an introduction direction of the bleed gas introduced into the main body from the inlets of the first introduction pipe and the second introduction pipe downstream of the bent portion is equally divided into an outer flow area and an inner flow area of the bent portion,
In each of the inlets of the first inlet pipe and the second inlet pipe, the outer flow area is configured to have a higher dust concentration than the inner flow area,
A chamber configured such that at least a portion of the outer flow area of the virtual flow path of the first inlet pipe and at least a portion of the inner flow area of the virtual flow path of the second inlet pipe collide with each other. In the main body, the bleed gas is introduced from the first introduction pipe and the second introduction pipe in opposing directions,
2. The chamber according to claim 1, wherein the bleed gas is introduced from the first inlet pipe and the second inlet pipe such that equator lines equally dividing the outer flow area and the inner flow area intersect at a collision surface where the virtual flow paths collide within the main body. the virtual flow paths from the first inlet pipe and the second inlet pipe, which are respectively connected to the opposing surfaces of the main body, are offset from each other along an in-plane direction of the opposing surfaces,
3. The chamber of claim 1 or 2, configured such that at least a portion of the outer flow area of one virtual flow path impinges with at least a portion of the inner flow area of the other virtual flow path. The chamber according to claim 1, wherein at a collision section where the virtual flow paths from the first inlet pipe and the second inlet pipe collide to cross each other, the outer flow area of one virtual flow path and the inner flow area of the other virtual flow path collide to join together. The chamber according to any one of claims 1 to 4, wherein the virtual flow paths from the first inlet pipe and the second inlet pipe are both offset from the outlet. The chamber according to any one of claims 1 to 5, wherein the main body has an inlet for introducing a cooling gas. The chamber according to any one of claims 1 to 6, wherein the main body has a dust exhaust port for exhausting dust. The chamber according to any one of claims 1 to 7, wherein the bending angle of the bent portion of the first inlet pipe and the second inlet pipe is 30 to 150°. A chlorine bypass facility comprising a chamber according to any one of claims 1 to 8 . 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 8 . a preheating and calcining step of 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 9 .

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