JP4512473B2 - Merger and branching device for extracted gas from cement manufacturing process - Google Patents

Description

  The present invention relates to a merging device and branching device for extracted gas from a cement manufacturing process, and in particular, to a chlorine bypass facility that extracts chlorine while extracting a part of a combustion gas while cooling a part of a combustion gas from an exhaust gas passage of a cement kiln. The present invention relates to a merging device and a branching device for extracted gas.

  Focusing on chlorine, sulfur, alkali, etc. that cause problems such as blockage of preheaters in cement production facilities, focusing on the problem of chlorine, from the kiln bottom of the cement kiln to the bottom cyclone From the kiln exhaust gas flow path, a chlorine bypass facility for extracting chlorine by extracting a portion of the combustion gas while cooling is used.

  For example, as shown in FIG. 9, the conventional chlorine bypass facility is roughly divided into a gas extraction unit 103 and a gas processing unit 104. The gas bleeder 103 is provided with a probe 106 that bleeds while cooling a part of the combustion gas from a kiln exhaust gas passage from the kiln bottom of the cement kiln 102 to a bottom cyclone (not shown), and cooling for supplying cold air to the probe 106 A fan 107 and a cyclone 108 as a classifier that separates dust dust contained in the combustion gas extracted by the probe 106 are configured. The gas processing unit 104 collects the extractor gas cooled by the cooler 111, a cooler 111 that cools the extracted gas containing fine powder discharged from the cyclone 108, a cooling fan 112 that supplies cool air to the cooler 111, and collects the extracted gas cooled by the cooler 111. Bag filter 113, a cooler 111 and a dust tank 114 for storing dust discharged from the bag filter 113, and an exhaust fan 115 for discharging exhaust from the bag filter 113 to the atmosphere.

  With the above configuration, when a part of the combustion gas is extracted from the kiln exhaust gas flow path of the cement kiln 102 while being cooled by the probe 106, fine crystals of the chlorine compound are generated, and chlorine is added to the fine powder side of the dust contained in the extracted exhaust gas. Since it is unevenly distributed, the coarse powder classified by the cyclone 108 is returned to the cement kiln system, and the fine powder (chlorine bypass dust) containing potassium chloride (KCl) and the like separated is collected by the bag filter 113 and the like, and the dust tank 114 And added to the cement grinding mill system (for example, see Patent Document 1).

  Further, in Patent Document 2, in the chlorine bypass, even when the amount of exhaust gas extracted from the kiln is increased in order to increase the removal amount of volatile components, that is, even when the bypass rate is increased, the temperature is easily increased to a predetermined temperature. A chlorine bypass facility that can cool and treat exhaust gas is disclosed. This chlorine bypass facility is equipped with a secondary cooling system that follows the primary cooling at the probe between the double-pipe structure probe that can extract the kiln exhaust gas at high speed and the cyclone that classifies the kiln exhaust gas dust. A secondary cooler is provided.

  Further, in Patent Document 3, in order to suppress the occurrence of coaching in the chlorine bypass facility, the cement kiln exhaust gas extracted by the extraction pipe is guided to the cooling chamber, and the cooling air along the inner surface of the extraction pipe and the cooling chamber. So that the exhaust gas temperature at the chamber outlet is cooled to 350 ° C. or lower and sufficient cooling air is blown into the cooling chamber outlet duct connected to the cooling chamber to maintain the swirling flow. Chlorine bypass facility that mixes cooling air, then guides it to the chamber, disturbs the swirling flow and mixes exhaust gas and cooling air well, removes the lump, and then leads to the dust collector to remove the powder Has been.

  As described in Patent Documents 1 to 3, the conventional chlorine bypass facility is configured with one gas extraction unit and one gas extraction unit for one kiln. Such a system consisting of one extraction unit / one processing unit can be applied to all kilns, but when a plurality of small kilns are installed adjacent to each other, each kiln has a low throughput of 1 Rather than installing an extraction unit / 1 processing unit system, it is more efficient to employ a multiple extraction unit / 1 processing unit system that combines multiple kiln exhaust gases and processes them collectively. In addition, in a kiln where a chlorine bypass facility has already been installed, in order to increase the throughput, the existing low-throughput processing section is removed and a high-throughput processing section is installed instead of the existing one. It is more efficient to adopt a single extraction unit / multi-processing unit system utilizing the processing unit.

Japanese Patent No. 3318714 International Publication No. WO00 / 1244 Pamphlet Japanese Patent No. 3438489

  In order to realize the above-described system, a kiln exhaust gas merging device (multi-extraction unit / 1 processing unit system) and a branching unit (single extraction unit / multi-processing unit system) are required. In such a gas merging device and a gas branching device, in order to ensure stable operation of the entire system, the gas amount distribution ratio can be easily set, and the gas temperature in each of the gas processing units can be adjusted. Performance such as no balance is required.

  Therefore, the present invention provides a merging device and a branch for extracted gas from a cement manufacturing process having the above-mentioned performance in order to realize a chlorine bypass facility and the like composed of a multiple extraction unit / 1 processing unit system and a single extraction unit / multiprocessing unit system. An object is to provide an apparatus.

In order to achieve the above object, the present invention is a gas merging apparatus comprising a plurality of gas inlet ducts for guiding extracted gas from a cement manufacturing process, a chamber, and a gas outlet duct having a smaller number than the gas inlet ducts. The distance between the gas inlet duct and the gas outlet duct is greater than 2.5 times the inner diameter of the gas inlet duct .

According to the gas merging device according to the present invention, it is possible to prevent a short-circuit flow of gas in the chamber, to ensure a sufficient gas mixing effect, and to realize a chlorine bypass facility or the like composed of a multiple extraction unit / 1 processing unit system. can do. In particular, since the distance between the plurality of gas inlet ducts and the gas outlet duct is made larger than 2.5 times the inner diameter of the gas inlet duct, the short-circuit flow of the gas in the chamber is prevented and the gas mixing effect is further improved. be able to. In this specification, the distance between the ducts means the distance between the centers of the duct openings, and when there are a plurality of inlet ducts or outlet ducts, the distance between the inlet duct and the outlet duct is the shortest. The distance.

  In the gas merging device, at least one of the plurality of gas inlet ducts may be provided with a flow rate adjusting damper. Thereby, the distribution ratio of the gas amount can be easily set, and stable operation of the entire system can be ensured.

  The gas junction device may further be provided with a dust recovery duct for discharging dust accumulated in the chamber. As a result, the short-circuit flow of the gas in the chamber can be more reliably prevented, and the gas mixing effect can be enhanced.

  The gas junction device may further include a cooling air duct for introducing cooling air into the chamber. As a result, secondary cooling can be performed following primary cooling by the probe, and a device that serves as a secondary cooling device and a gas merging device can be configured.

Further, the present invention is a gas branching device comprising a gas inlet duct for guiding extracted gas from a cement manufacturing process, a chamber, and a plurality of gas outlet ducts, wherein the number of the gas inlet ducts is the number of the gas outlet ducts. The distance between the gas inlet duct and the gas outlet duct is less than the number, and is greater than 1.5 times the inner diameter of the gas inlet duct .

According to the present invention, a short-circuit flow of gas in the chamber can be prevented, a sufficient gas mixing effect can be secured, and a chlorine bypass facility composed of a single extraction unit / multi-processing unit system can be realized. In particular, since the distance between the gas inlet duct and the plurality of gas outlet ducts is made larger than 1.5 times the inner diameter of the gas inlet duct, it is possible to further prevent the gas short-circuit flow in the chamber and further improve the gas mixing effect. it can.

  The gas branching device may further include a dust collection duct for discharging dust accumulated in the chamber. As a result, a short-circuit flow of gas in the chamber can be prevented more reliably, and the gas mixing effect can be enhanced.

  The gas branching device may further include a cooling air duct for introducing cooling air into the chamber. As a result, secondary cooling can be performed following primary cooling by the probe, and a device that serves as a secondary cooling device and a gas merging device can be configured.

  Furthermore, this invention is chlorine bypass equipment, Comprising: One of the said extraction gas confluence | merging apparatuses, or one of the said extraction gas branching apparatuses is provided, It is characterized by the above-mentioned. Thus, a chlorine bypass facility capable of stable operation can be realized, which is composed of a multiple extraction unit / 1 processing unit system or a single extraction unit / multiprocessing unit system, and a plurality of small kilns are installed adjacent to each other. In this case, it is possible to cope with a case where the processing amount is increased in a kiln in which a chlorine bypass facility is already installed.

  As described above, according to the present invention, an apparatus for merging extracted gas from a cement manufacturing process that can easily set the distribution ratio of the gas amount and does not cause an imbalance in gas temperature in each of the gas processing units. And a branching device can be provided, thereby realizing a chlorine bypass facility comprising a multiple extraction unit / 1 processing unit system or a single extraction unit / multiprocessing unit system.

  FIG. 1 shows a chlorine bypass facility to which a merging gas merging device (hereinafter referred to as “gas merging device”) from a cement manufacturing process according to the present invention is applied. The chlorine bypass facility 1 includes two kilns 2A, The gas extraction units 3 </ b> A and 3 </ b> B installed in 2 </ b> B and one gas processing unit 4 are connected by a gas merging device 5.

  The gas extraction unit 3A on the kiln 2A side includes a probe 6A for extracting air while cooling a part of the combustion gas from the kiln exhaust gas passage from the bottom of the kiln 2A to the bottom cyclone (not shown), and cool air to the probe 6A. And a cyclone 8A for separating coarse dust particles contained in the combustion gas extracted by the probe 6A. Similarly, the gas bleeder 3B on the kiln 2B side includes a probe 6B, a cooling fan 7B, and a cyclone 8B.

  On the other hand, the gas processing unit 4 includes a cooler 10 that cools the extracted gas containing fine powder discharged from the gas merging device 5, a cooling fan 11 that supplies cool air to the cooler 10, and the extracted air cooled by the cooler 10 A bag filter 12 that collects gas, a dust tank 13 that stores dust discharged from the cooler 10 and the bag filter 12, and an exhaust fan 14 that discharges exhaust from the bag filter 12 to the atmosphere.

  In addition, although the said chlorine bypass equipment 1 is a type with which the cyclone 8 was attached as a classifier of coarse powder dust, the gas junction apparatus concerning this invention is applied also to the type of chlorine bypass equipment without the cyclone 8 attached. be able to.

  Next, the structure of the gas merging device 5 that connects the gas extraction units 3A and 3B and the gas processing unit 4 will be described with reference to FIGS.

  The gas junction device 15 shown in FIG. 2 includes a plurality of gas inlet ducts 16 </ b> A and 16 </ b> B that guide the extracted gas from the cement manufacturing process, a chamber 17, and a gas outlet duct 18. Each of the gas inlet ducts 16A and 16B is provided with flow rate adjusting dampers 19A and 19B so that the flow rate of the extraction gas supplied from the gas inlet ducts 16A and 16B to the chamber 17 can be easily adjusted. The

  The gas inlet ducts 16 </ b> A and 16 </ b> B and the gas outlet duct 18 are connected to each other at a distance in order to prevent a short-circuit flow of gas in the chamber 17 and to ensure a gas mixing effect. That is, in the illustrated example, the gas inlet ducts 16 </ b> A and 16 </ b> B are disposed on the upper surface side of the chamber 17, and the gas outlet duct 18 is disposed on the lower surface side of the chamber 17. The distance between the gas inlet ducts 16A, 16B and the gas outlet duct 18 is 2.5 times the inner diameter of the gas inlet ducts 16A, 16B (which is larger when the inner diameters of the gas inlet ducts 16A, 16B are different). It is preferable to make it larger. There is no particular upper limit to the distance between the gas inlet duct and the gas outlet duct, but it is realistic that the distance between the gas inlet duct and the inner diameter of the gas inlet duct is within 5 times in terms of installation space.

  The gas junction device 25 shown in FIG. 3 is further provided with a dust collection duct 30 for discharging dust accumulated in the chamber 27 below the chamber 27 in the configuration shown in FIG. The gas outlet duct 28 is arranged in the above. The other gas inlet ducts 26A and 26B, the chamber 27, and the flow rate adjusting dampers 29A and 29B are the same as those shown in FIG. Since the gas merging device 25 includes the dust collection duct 30, dust accumulated in the chamber 27 can be discharged, and a short-circuit flow of the gas in the chamber 27 can be more reliably prevented, and the gas mixing effect can be enhanced. it can. Moreover, since the dust collection duct 30 is provided in the lower part of the chamber 27, the dust accumulated in the chamber 27 can be easily discharged out of the system.

  The gas junction device 35 shown in FIG. 4 further includes a cooling air duct 40 in the upper part of the chamber 37 in the configuration shown in FIG. The other gas inlet ducts 36A and 36B, the chamber 37, the flow rate adjusting dampers 39A and 39B, and the gas outlet duct 38 are the same as those shown in FIG. Since the gas merging device 35 includes the cooling air duct 40, the secondary cooling can be performed subsequent to the primary cooling by the probes 6A and 6B shown in FIG. 1, and the secondary cooling described in Patent Document 2 is performed. A device serving both as a device and a gas merging device can be configured.

  FIG. 5 shows a chlorine bypass facility to which an extraction gas branching device (hereinafter referred to as “gas branching device”) from the cement manufacturing process according to the present invention is applied. This chlorine bypass facility 51 is a gas installed in the kiln 52. The extraction unit 53 and the two gas processing units 54 </ b> A and 54 </ b> B are connected by a gas branching device 55.

  The gas bleeder 53 includes a probe 56 that bleeds air while cooling a part of the combustion gas from a kiln exhaust gas passage from the kiln bottom of the cement kiln 52 to a bottom cyclone (not shown), and cooling that supplies cold air to the probe 56 A fan 57 and a cyclone 58 that separates coarse dust particles contained in the combustion gas extracted by the probe 56 are configured.

  On the other hand, of the two gas processing units 54A and 54B, the gas processing unit 54A described in the upper part of FIG. 5 includes a cooler 61A that cools the extraction gas containing fine powder discharged from the gas branching device 55, and a cooling unit 61A. A cooling fan 62A for supplying cold air to the cooler 61A, a bag filter 63A for collecting the bleed gas cooled by the cooler 61A, a dust tank 64A for storing dust discharged from the cooler 61A and the bag filter 63A, The exhaust fan 65A is configured to release the exhaust from the bag filter 63A to the atmosphere. Similarly, the gas processing unit 54B described below in FIG. 5 includes a cooler 61B, a cooling fan 62B, a bag filter 63B, a dust tank 64B, and an exhaust fan 65B.

  In the chlorine bypass facility 51, the gas branching device 55 is installed on the downstream side of the cyclone 58 as a coarse dust classifier. However, the gas branching device 55 may be installed on the upstream side of the cyclone 58. Moreover, although the said chlorine bypass equipment 51 is a type with which the cyclone 58 was attached, the gas branching apparatus 55 is applicable also to the type of chlorine bypass equipment without the cyclone 58 attached.

  Next, the structure of the gas branching device 55 that connects the gas extraction unit 53 and the gas processing units 54A and 54B will be described with reference to FIGS.

  The gas branching device 75 shown in FIG. 6 includes a gas inlet duct 76 that guides extracted gas from the cement manufacturing process, a chamber 77, and gas outlet ducts 78A and 78B. The gas inlet duct 76 and the gas outlet ducts 78A and 78B are connected to each other at a distance in order to prevent a short-circuit flow of gas in the chamber 77 and to ensure a gas mixing effect. That is, in the illustrated example, the gas inlet duct 76 is disposed on the lower surface side of the chamber 77, and the gas outlet ducts 78 </ b> A and 78 </ b> B are disposed on the upper surface side of the chamber 77. The distance between the gas inlet duct 76 and the gas outlet ducts 78 </ b> A and 78 </ b> B is preferably greater than 1.5 times the inner diameter of the gas inlet duct 76. There is no particular upper limit to the distance between the gas inlet duct and the gas outlet duct, but it is realistic that the distance between the gas inlet duct and the inner diameter of the gas inlet duct is within 5 times in terms of installation space.

  The gas branching device 85 shown in FIG. 7 is further provided with a dust collection duct 90 for discharging dust accumulated in the chamber 87 at the lower part of the chamber 87 in the configuration shown in FIG. A gas inlet duct 86 is arranged at the bottom. The other gas outlet ducts 88A and 88B and the chamber 87 are the same as those shown in FIG. Since the gas branching device 85 includes the dust collection duct 90, dust accumulated in the chamber 87 can be discharged, and a short-circuit flow of the gas in the chamber 87 can be more reliably prevented, and the gas mixing effect can be enhanced. it can. Moreover, since the dust collection duct 90 is installed in the lower part of the chamber 87, the dust accumulated in the chamber 87 can be easily discharged out of the system.

  The gas branching device 95 shown in FIG. 8 is further provided with a cooling air duct 100 in the lower part of the chamber 97 in the configuration shown in FIG. The other gas inlet duct 96, the chamber 97, and the gas outlet ducts 98A and 98B are the same as those shown in FIG. Since this gas branching device 95 includes the cooling air duct 100, the secondary cooling can be performed following the primary cooling by the probe 56 shown in FIG. An apparatus that also serves as a gas branching apparatus can be configured.

  In the gas branching devices 75, 85, and 95, the amount of gas discharged from the gas outlet ducts 78, 88, and 98 can be adjusted in the gas processing units 54A and 54B shown in FIG. It is not necessary to provide a flow rate adjusting damper in the gas outlet ducts 78, 88, 98.

It is a flowchart which shows an example of the chlorine bypass installation using the gas confluence | merging apparatus concerning this invention. It is the schematic which shows one Embodiment of the gas confluence | merging apparatus concerning this invention. It is the schematic which shows one Embodiment of the gas confluence | merging apparatus concerning this invention. It is the schematic which shows one Embodiment of the gas confluence | merging apparatus concerning this invention. It is a flowchart which shows an example of the chlorine bypass facility using the gas branch apparatus concerning this invention. It is the schematic which shows one Embodiment of the gas branch apparatus concerning this invention. It is the schematic which shows one Embodiment of the gas branch apparatus concerning this invention. It is the schematic which shows one Embodiment of the gas branch apparatus concerning this invention. It is a flowchart which shows an example of the conventional chlorine bypass installation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chlorine bypass equipment 2 (2A, 2B) Kiln 3 (3A, 3B) Gas extraction part 4 Gas processing part 5 Gas confluence apparatus 6 (6A, 6B) Probe 7 (7A, 7B) Cooling fan 8 (8A, 8B) Cyclone DESCRIPTION OF SYMBOLS 10 Cooler 11 Cooling fan 12 Bag filter 13 Dust tank 14 Exhaust fan 15 Gas merging device 16 (16A, 16B) Gas inlet duct 17 Chamber 18 Gas outlet duct 19 (19A, 19B) Flow rate adjusting damper 25 Gas merging device 26 (26A) 26B) Gas inlet duct 27 Chamber 28 Gas outlet duct 29 (29A, 29B) Flow rate adjusting damper 30 Dust recovery duct 35 Gas confluence device 36 (36A, 36B) Gas inlet duct 37 Chamber 38 Gas outlet duct 39 (39A, 39B) Flow control damper 40 Cooling air duct 51 Chlorine Bypass equipment 52 Kiln 53 Gas extraction part 54 (54A, 54B) Gas processing part 55 Gas branching device 56 Probe 57 Cooling fan 58 Cyclone 61 (61A, 61B) Cooler 62 (62A, 62B) Cooling fan 63 (63A, 63B) Bag filter 64 (64A, 64B) Dust tank 65 (65A, 65B) Exhaust fan 75 Gas branch device 76 Gas inlet duct 77 Chamber 78 (78A, 78B) Gas outlet duct 85 Gas branch device 86 Gas inlet duct 87 Chamber 88 (88A) 88B) Gas outlet duct 90 Dust collection duct 95 Gas branching device 96 Gas inlet duct 97 Chamber 98 (98A, 98B) Gas outlet duct 100 Cooling air duct

Claims (8)

A gas merging device comprising a plurality of gas inlet ducts for guiding extracted gas from a cement manufacturing process, a chamber, and a gas outlet duct having a smaller number than the gas inlet ducts,
The apparatus for merging extracted gas from a cement manufacturing process , wherein a distance between the gas inlet duct and the gas outlet duct is larger than 2.5 times an inner diameter of the gas inlet duct . To at least one of said plurality of gas inlet duct, merging apparatus of the extracted gas from the cement manufacturing process according to claim 1, characterized in that it comprises a flow control damper. The apparatus for merging extracted gas from a cement manufacturing process according to claim 1 or 2 , further comprising a dust recovery duct for discharging dust accumulated in the chamber. The apparatus for merging extracted gas from a cement manufacturing process according to claim 1 , further comprising a cooling air duct for introducing cooling air into the chamber. A gas branching device comprising a gas inlet duct for guiding extracted gas from a cement manufacturing process, a chamber, and a plurality of gas outlet ducts,
The number of the gas inlet ducts is less than the number of the gas outlet ducts, and the distance between the gas inlet duct and the gas outlet duct is larger than 1.5 times the inner diameter of the gas inlet duct. Branch device for extracted gas from the process. 6. The branching device for extracted gas from a cement manufacturing process according to claim 5 , further comprising a dust recovery duct for discharging dust accumulated in the chamber. The apparatus for branching extracted gas from a cement manufacturing process according to claim 5 or 6 , further comprising a cooling air duct for introducing cooling air into the chamber. A merging device for the extracted gas from the cement manufacturing process according to any one of claims 1 to 4 , or a branching device for the extracted gas from the cement manufacturing process according to any one of claims 5 to 7. Chlorine bypass equipment.

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