JP4512849B2 - Waste fuel conversion system in cement manufacturing facility and cement manufacturing method using waste fuel conversion system - Google Patents

Description

  The present invention relates to a halogen-containing fuel conversion system in a cement manufacturing facility that uses a halogen-containing material containing halogen such as chlorine as a fuel and uses the fuel as a part of fuel in the cement manufacturing facility, and a method of manufacturing cement using the system. Is.

  As is well known, various plastics are used as various beverage containers, recording tapes, automobile tires, and the like. These plastics are disposed of as a large amount of industrial waste after use, but in recent years, a method of incinerating the waste has been adopted due to the limit of landfill treatment.

  By the way, combustible wastes such as the plastics generate a predetermined amount of heat by incineration. In view of this, there has been implemented a treatment method in which the combustible waste is put into a rotary kiln in a cement production facility and fired, and at the same time, the heat generated at that time is used as part of the fuel for cement production.

  At this time, if the above flammable waste is directly put into the kiln bottom part of the rotary kiln or the rising duct provided in the preceding stage, the amount of heat at the time of incineration can be used for preheating the cement raw material, This does not contribute to the firing of the cement raw material. Further, when the combustible waste contains a lot of moisture, the heat of vaporization lowers the exhaust gas temperature at the input location, which may hinder stable operation.

As a prior art for solving such problems, for example, a waste treatment apparatus for cement firing described in Patent Document 1 below has been proposed.
This waste treatment apparatus includes an externally heated kiln that generates dry distillation gas by dry distillation with a high-temperature gas before putting combustible waste such as plastic into the rotary kiln, and a high-temperature chlorine bypass gas generated in the rotary kiln. A high-temperature gas supply device that supplies high-temperature gas mixed with low-temperature cooler exhaust gas to the external heating kiln, and a dry distillation gas supply line that supplies dry distillation gas generated in the external heating kiln to the burner of the rotary kiln. Is.

According to the waste treatment apparatus having the above-described configuration, since the dry distillation gas generated in the external heating kiln is supplied to the burner of the rotary kiln, the main fuel of the kiln corresponding to the calorific value can be reduced. The dry-distilled ash treated with the external heat kiln has an advantage that adverse effects due to chlorine and moisture can be avoided because it is not supplied to cement burning equipment.
JP 2002-195524 A

  However, in the conventional waste treatment apparatus, when the combustible waste is a plastic having a high chlorine content such as polyvinyl chloride (PVC), the chlorine content is reduced by dry distillation in an external heating kiln. Since most of it moves to dry distillation gas, if it is used as a fuel for a rotary kiln, chlorine is concentrated in the cement firing equipment including the rotary kiln and clogged with a preheater, which adversely affects operations. is there.

  In general, cement production facilities are provided with a chlorine bypass system that extracts a part of the exhaust gas and removes chlorine content in order to avoid the concentration of chlorine by circulating in the facility. In addition, there is no ability to remove chlorine separately introduced from the dry distillation gas, which causes a problem that the amount of waste treated or the chlorine content in the waste is significantly limited.

  In addition, plastic wastes with low chlorine content such as polyethylene (PE) and polypropylene (PP) have a high calorific value per se. However, in the above waste treatment equipment, dry-distilled ash is put into cement burning equipment. Since it is not introduced, sufficient energy cannot be reused from the waste, and secondary waste called dry distillation ash that still needs to be processed is generated.

  The present invention has been made in view of the above circumstances, and halogen-containing materials such as flammable waste containing chlorine can be obtained without causing any harmful effects caused by halogens such as chlorine and bromine contained in the halogen-containing materials. It is an object of the present invention to provide a halogen-containing fuel conversion system in a cement manufacturing facility that can effectively use the calorific value as a part of cement manufacturing fuel, and a cement manufacturing method using the system.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a halogen-containing material fuel in a cement manufacturing facility having a preheater for preheating a cement raw material and a cement kiln for firing the cement raw material introduced from the preheater. A heating medium supply line for extracting a high temperature cement raw material heated to 250 ° C. or higher from the upstream side of the cement kiln, and a halogen containing halogen in the high temperature cement raw material supplied from the heating medium supply line A halogen separation means for generating a flammable gas containing halogen and a residue by directly contacting the product, and a halogen recovery means for recovering the halogen from the flammable gas containing the halogen discharged from the halogen separation means; After the halogen is recovered by the halogen recovery means, Gas supply means for supplying a property gas as fuel for the cement production facility, and a return line for returning the high-temperature cement raw material and residues discharged from the halogen separation means to the upstream side of the cement kiln. It is a feature.

Here, as a cement manufacturing facility for supplying the combustible gas, a generator, a boiler, or the like provided in the cement manufacturing facility can be applied in addition to a cement kiln, a calcining furnace, or the like.
Also, the upstream side of the cement kiln connecting the return line is applicable to a kiln bottom of the cement kiln, the calcining furnace, the cyclone, a dry mill for mixing cement raw materials, or a cement raw material storage facility. .

  In general, the pre-heater has a plurality of cyclones that sequentially heat and lower the cement raw material, and the cement raw material that passes through the cyclone is usually specified in claim 1 even in the uppermost cyclone. It has a temperature of 250 ° C. or higher. In the lowermost cyclone, the temperature is raised to about 870 ° C.

  Therefore, as the connection point of the heat medium supply line for extracting the high-temperature cement raw material, any of the cyclones of the preheater or, when the preheater is provided with the bypass device, can be the bypass device.

The invention according to claim 2 is the invention according to claim 1, in which the heat medium supply line is connected to the discharge side of the raw material of the cyclone at the lowest stage to which the cement raw material is supplied. At the same time, the return line is provided with dust cleaning means for cleaning the high-temperature cement raw material and residues discharged from the halogen separation means to remove salts.

  The bypass means refers to the entirety of various bypass facilities branched from a preheater such as a chlorine bypass or an alkali bypass.

  Next, the invention described in claim 3 is a method for producing cement using the halogen-containing fuel conversion system according to claim 1 or 2, wherein the burner provided before the kiln of the cement kiln is used to manufacture the cement. When the cement raw material supplied from the preheater is fired to produce a clinker, the combustible gas after the halogen is recovered by the halogen recovery means is supplied as fuel to the cement manufacturing facility. Is.

  The invention according to claim 4 is the adhesion preventing material according to claim 3, which prevents the halogen-containing material and the high-temperature cement raw material from adhering to the halogen separating means. It is characterized by supplying.

  The halogen-containing material fueling system in the cement manufacturing facility according to claim 1 or 2, and the cement manufacturing method according to claim 3 or 4 using the same, the halogen-containing material containing halogen such as chlorine and bromine. However, in direct contact with the high temperature cement raw material of 250 ° C. or higher supplied from the heat medium supply line in the halogen separation means, a flammable gas containing halogen and a residue from which most of the halogen has been removed are generated. .

  For example, when the halogen-containing material is combustible waste such as plastic, the combustible waste is thermally decomposed in the halogen separation means, and is composed of hydrogen chloride and a combustible gas mainly containing hydrocarbons. A cracked gas and a residue containing an oil component corresponding to the pyrolysis temperature are generated, with the main component being a carbide from which most of the halogen has been removed.

  And about the said combustible gas, after halogens, such as the said chlorine content and a bromine content, are removed in a halogen recovery means, it is returned to the said cement manufacturing equipment from a return line, The baking of the cement raw material in a cement manufacturing equipment, etc. As part of the fuel needed for

  On the other hand, the high temperature cement raw material containing the residue discharged from the halogen separation means is returned to the upstream side of the cement kiln from a return line. Thereby, the high-temperature cement raw material and the residue are finally supplied to the cement kiln at the subsequent stage together with other cement raw materials and fired. At this time, if the residue contains a combustible component such as carbon, it can be used as part of the fuel in the calcining furnace provided in the cement kiln or in the preceding stage of the cement kiln. it can.

Incidentally, when a large amount of halogen salts are contained, the high temperature cement raw material and the residue discharged from the halogen separation means are once disposed in the return line as in the invention described in claim 2. After the salt is washed away by means, it is returned from the return line to the upstream side of the cement kiln.
At this time, the cement raw material and the residue containing moisture can be dried after passing through the dust cleaning means, and returned to the upper cyclone or the dry mill.

  Further, if the return line is connected to the calciner or the kiln bottom of a cement kiln, the cement raw material containing moisture by passing through the dust cleaning means is dried directly without drying the high temperature calciner or It is possible to put in the kiln bottom.

  In this way, halogen-containing materials containing halogens such as chlorine and bromine can be processed smoothly in cement production facilities, and the calorific value thereof does not cause harmful effects due to the halogen contained in the halogen-containing materials. Can be effectively used as a part of fuel for cement production.

  Moreover, since the halogen recovery means removes halogen such as chlorine from the flammable gas and then returns to the cement manufacturing facility, this halogen-containing fuel conversion system also functions as the chlorine bypass in the cement manufacturing facility. Can be made.

  At this time, even when the halogen separation means is, for example, a rotary kiln-type pyrolysis furnace, the high-temperature cement raw material functions as an adhesion preventing material, so that the halogen-containing material is prevented from adhering to the halogen separation means. However, as in the invention described in claim 4, by introducing an adhesion preventing material, the halogen-containing material is reliably prevented from adhering to the inner wall of a pyrolysis furnace, etc. The separation process can be performed.

  As such an adhesion preventing material, a soil material such as clay, paper material, wood, plastic film and the like are applicable. At this time, if waste such as sewage sludge, construction waste wood or waste plastic film is used instead, it is possible to simultaneously treat these wastes.

  In particular, if sewage sludge is used as the anti-adhesion material and a supply pipe for introducing an ammonia-containing material such as sewage sludge is provided inside the halogen separation means, the ammonia contained in the ammonia-containing material is thermally decomposed. Since it sometimes reacts with chlorine contained in the halogen-containing material to produce ammonium chloride, it is preferable that the residue of chlorine in the residue can be minimized.

  FIG. 1 shows an embodiment of a waste fueling system in a cement manufacturing facility in which the halogen-containing fueling system in a cement manufacturing facility according to the present invention is applied when the halogen-containing material is flammable waste containing chlorine. In the figure, reference numeral 1 denotes a cement kiln for firing cement raw materials.

  The cement kiln 1 is a rotary kiln provided so as to be rotatable about an axis, and a preheater 2 for preheating cement raw material is provided on the left side of the kiln bottom 1a in the figure, and the right side in the figure. 1b is provided with a main burner (not shown) for heating the inside. Further, a clinker cooler 3 for cooling the clinker obtained by the cement kiln 1 is provided in the front of the kiln 1b.

    Here, the preheater 2 is composed of a plurality of (four in the figure) cyclones 2a to 2d arranged in series in the vertical direction, and the cement raw material is supplied to the first cyclone 2a. . Further, between the third-stage cyclone 2c and the fourth-stage cyclone 2d, combustion exhaust gas is introduced from the kiln bottom 1a of the cement kiln 1 to the lower end and supplied from a fuel supply line (not shown) to the inside. There is provided a calcining furnace 4 provided with a combustion apparatus for fuel such as coal.

  The cement production facility having the cement kiln 1, the preheater 2, the calciner 4, and the like has a waste fueling system for pretreating combustible plastic waste containing chlorine and introducing it into the cement kiln 1. Is provided.

  Reference numeral 5 in the figure is a sorting device (sorting means) provided on the most upstream side of this waste fueling system. The sorting device 5 is a waste containing a large amount of chlorine such as polyvinyl chloride or polyvinylidene chloride (hereinafter abbreviated as a chlorine-containing plastic) by combustible plastic waste to be treated by specific gravity sorting or infrared sorting. And wastes with low chlorine content such as polyethylene and polypropylene (hereinafter abbreviated as low chlorine concentration plastics).

  Then, the low chlorine concentration plastic separated by the sorting device 5 is introduced into the cement kiln 1 from the front kiln 1b as a part of the fuel through the waste fuel supply line 6. . The waste fuel supply line 6 may be charged with the low chlorine concentration plastic as part of its fuel in the calcining furnace 4 instead of the cement kiln 1. On the other hand, the chlorine-containing plastic separated by the sorting device 5 is introduced from the thermal decomposition line 7 into a subsequent thermal decomposition furnace (halogen separation means) 8.

  The pyrolysis furnace 8 is a cylindrical pyrolysis furnace provided rotatably around an axis and supplied with chlorine-containing plastic. The pyrolysis line 7 is connected to one end of the pyrolysis furnace 8. Further, a supply pipe 9 for introducing sewage sludge is connected to the one end side.

  Here, the sewage sludge is supplied mainly as an adhesion preventing material, and instead of this, a soil material such as clay, a paper material, wood, a plastic film, or the like is applicable. At this time, if waste such as sewage sludge, construction waste wood or waste plastic film is used instead, it is possible to simultaneously treat these wastes.

  Furthermore, a heat medium supply line 10 is connected to one end side of the pyrolysis furnace 8 for extracting a high-temperature cement raw material from the discharge side of the lowermost cyclone 2d as a heat medium and supplying it to the pyrolysis furnace 8.

On the other hand, the other end of the pyrolysis furnace 8 is connected to a return line 11 for returning the high-temperature cement raw material containing the pyrolysis residue generated in the pyrolysis furnace 8 to the calcining furnace 4. Is provided with a dust cleaning device (dust cleaning means) 12 for removing the salts by washing the high-temperature cement raw material discharged from the pyrolysis furnace 8 with water.
In addition, a cracked gas extraction line 13 is connected to the upper portion of the pyrolysis furnace 8 to send the pyrolysis gas generated in the pyrolysis furnace 8 to a subsequent gas cleaning device (halogen recovery means) 14.

  This gas scrubber 14 brings the pyrolysis gas (combustible gas) discharged from the pyrolysis furnace 8 into contact with an alkali component such as calcium hydroxide added from the supply pipe 14a, and in the pyrolysis gas. In order to remove the chlorine content contained in the salt as a salt such as calcium chloride from the pyrolysis gas, various wet or dry gas cleaning apparatuses can be applied. Here, reference numeral 14 b in the figure is a discharge pipe for the calcium chloride aqueous solution and the like, and reference numeral 14 c is a return pipe for returning the pyrolysis gas containing unreacted alkali components to the inlet of the gas cleaning device 14.

  A gas supply line (gas) for supplying the combustible pyrolysis gas cleaned by the gas cleaning device 14 as a part of the fuel into the calcining furnace 4 is provided on the discharge side of the gas cleaning device 14. Supply means) 15 is connected.

  In the preheater 2, the combustion exhaust gas introduced from the kiln bottom 1a of the cement kiln 1 is gradually cooled by preheating the cement raw material in the course of being sequentially sent to the upper cyclones 2d to 2a. For this reason, since the high temperature cement raw material which was about 270 ° C. in the uppermost cyclone 2a becomes about 879 ° C. in the lowermost cyclone 2d, even if the high temperature cement raw material is extracted from any of the cyclones 2a to 2d, The high-temperature cement raw material in the range of about 250 ° C. to 900 ° C. necessary for the thermal decomposition can be supplied to the thermal decomposition furnace 8.

  On the other hand, the thermal decomposition is desirably performed at a maximum temperature in the range of 250 ° C to 650 ° C. At this time, if the pyrolysis is performed at a relatively low temperature within the above range, the pyrolysis gas has a relatively small calorific value, but a large amount of carbon remains in the pyrolysis residue, and the calorific value increases. . On the other hand, if it is carried out at a relatively high temperature, the calorific value of the pyrolysis gas increases, but conversely, the combustible content in the pyrolysis residue decreases and the amount of oil generated increases.

  Therefore, in the present embodiment, the case where the high-temperature cement raw material is extracted from the lowermost cyclone 2d is shown as an example, but the cyclone 2a is extracted in consideration of the properties of the waste and the specification use of the combustible gas. It is possible to select the heating temperature by appropriately selecting ~ 2d.

  In addition, as shown in FIG. 2, a chlorine bypass pipe 20 is connected to a duct that sends exhaust gas from the kiln bottom 1a of the cement kiln 1 to the fourth-stage cyclone 2d, and one of the exhaust gases extracted by the chlorine bypass pipe 20 When a chlorine bypass (bypass means) for removing the chlorine content by sending the part to the subsequent bag filter 21 is provided, chlorine is removed by connecting the heat medium supply line 10 to the chlorine bypass pipe 20. A large amount of dusty high temperature cement raw material may be extracted and supplied to the pyrolysis furnace 8.

  In this case, a cleaning device is required after the pyrolysis furnace. Alternatively, since the high-temperature cement raw material is contained in dust in the exhaust gas, the collected coarse-grained high-temperature cement is additionally provided in the middle of the heat medium supply line 10 with a dust collecting means such as a cyclone. It is preferable to supply only the raw material to the pyrolysis furnace 8.

Next, an embodiment of a cement manufacturing method according to the present invention using the waste fuel conversion system configured as described above will be described.
First, the cement raw material charged into the first-stage cyclone 2a of the preheater 2 starts from the cement kiln 1 that rises from below as it sequentially falls to the lower cyclones 2b to 2d, as indicated by solid arrows in the figure. Is preheated by the high-temperature exhaust gas and finally introduced into the kiln bottom 1a of the cement kiln 1 from the lowermost cyclone 2d.

  And in this cement kiln 1, in the process gradually sent from the kiln bottom 1a side to the kiln front 1b side, it is heated by the combustion exhaust gas from the main burner, baked and becomes a clinker. Next, the clinker that has reached the kiln front 1b falls into the clinker cooler 3 and is sent to the right in the figure, as indicated by an arrow in the figure. At this time, the air is cooled to a predetermined temperature by the air supplied into the clinker cooler 3 and finally taken out from the clinker cooler 3.

  By the way, the chlorine content contained in the cement raw material volatilizes mainly as alkali chlorides such as KCl and NaCl in the high temperature (about 1400 ° C.) atmosphere in the cement kiln 1 and moves into the exhaust gas. And when this exhaust gas is exhausted from the kiln bottom 1a of the cement kiln 1 to the pre-heater 2 side and rises sequentially from the lower part to the upper cyclones 2d-2a, it is cooled by preheating the cement raw material, The chlorine content contained therein will move to the cement raw material side again.

  As a result, the chlorine content circulates in the system composed of the cement kiln 1 and the preheater 2, and the internal chlorine concentration gradually increases due to the chlorine content newly introduced into the system from the combustion exhaust gas or the cement raw material. Eventually, the cyclone of the pre-heater 2 is blocked, which hinders operation.

  Therefore, in the cement manufacturing facility having a chlorine bypass shown in FIG. 2, a part of the exhaust gas is periodically extracted from the chlorine bypass pipe 20 and cooled to recover the chlorine content as alkali chloride in the subsequent bag filter 21. This prevents the chlorine concentration in the system from increasing.

  In parallel with the manufacture of the above cement clinker, the combustible waste to be treated containing chlorine-containing plastic is put into the sorting device 5 and separated into chlorine-containing plastic and other wastes such as low chlorine-concentration plastic. . And about a low chlorine concentration plastic, it is made to burn in the cement kiln 1 by throwing in directly from the front kiln 1b side of the cement kiln 1 via the waste fuel supply line 6, and as a part of the fuel Use.

  On the other hand, the chlorine-containing plastic separated by the sorting device 5 is introduced from the thermal decomposition line 7 into the subsequent thermal decomposition furnace 8. In parallel with this, the high temperature cement raw material is extracted from the lowermost cyclone 2 c or the chlorine bypass pipe 20 (FIG. 2) by the heat medium supply line 10 and supplied to the pyrolysis furnace 8.

  Then, in the pyrolysis furnace 8, the chlorine-containing plastic is pyrolyzed by directly contacting the high temperature cement raw material. As a result, a pyrolysis gas mainly containing hydrogen chloride and a pyrolysis residue mainly composed of carbide from which most of the halogen has been removed are generated in the pyrolysis furnace 8.

  At this time, the sewage sludge supplied from the sewage sludge supply pipe 9 prevents the chlorine-containing plastic and its pyrolysis residue from adhering to the inner wall of the pyrolysis furnace 8. In addition, when a large amount of water contained in the sewage sludge becomes water vapor, volatilization of chlorine from the waste during the thermal decomposition is promoted, and in parallel, the ammonia content contained in the sewage sludge is Reacts with volatilized chlorine to produce ammonium chloride. As a result, the residue of chlorine in the thermal decomposition residue is minimized.

  And the high temperature cement raw material containing the said thermal decomposition residue is first sent to the dust washing apparatus 12 from the return line 11, and the halogen contained in the high temperature cement raw material etc. is wash | cleaned and removed by washing with water in the inside. Is done. Next, the cement raw material and pyrolysis residue that have passed through the dust cleaning device 12 are introduced from the return line 11 into the calcining furnace 4 or the kiln bottom 1a of the cement kiln 1 as shown in FIG. Thereby, a cement raw material and a thermal decomposition residue are finally sent to the cement kiln 1 with other cement raw materials, and are baked. At this time, the combustible component contained in the pyrolysis residue is used as part of the fuel in the calcining furnace 4 or the cement kiln 1.

  On the other hand, the flammable pyrolysis gas is supplied into the calcining furnace 4 by the gas supply line 15 after removing halogen such as chlorine in the gas cleaning device 14 and used as part of the fuel. . Further, since the gas cleaning device 14 removes chlorine and the like contained in the pyrolysis gas and then returns to the calcining furnace 4, it is the same as the chlorine bypass system comprising the chlorine bypass pipe 20 and the bag filter 21. Can be obtained.

  In this way, combustible waste containing chlorine can be processed smoothly in a cement production facility, and its calorific value can be reduced without producing any harmful effects caused by chlorine contained in the waste. It can be used effectively as part of the fuel.

  In the above embodiment, only the case where the waste is separated into the chlorine-containing plastic and the low chlorine concentration plastic by the sorting device 5 has been described. However, the present invention is not limited to this, and the sorting device 5 is not installed. Thus, both the chlorine-containing plastic and the low chlorine concentration plastic may be introduced into the pyrolysis furnace 8 without being selected. In particular, when the waste to be treated contains a large amount of chlorine-containing plastic, adopting this configuration is preferable because the entire system can be simplified.

  Further, after the high temperature cement raw material and the residue discharged from the pyrolysis furnace 8 are once removed by washing the salts with a dust cleaning device 12 interposed in the return line 11, the calcining furnace 4 or cement is returned from the return line 11. Although it returned to the kiln bottom 1a of the kiln 1, it is not restricted to this, The said cement raw material etc. which were discharged | emitted from the dust cleaning apparatus 12 are dried, and the upper stage cyclone 2a or its upstream cement raw material not shown in figure Can be returned to a dry mill or the like for mixing.

  Moreover, also about the position which extracts a high temperature cement raw material, it can also extract from not only the lowermost cyclone 2d and the chlorine bypass pipe 20 mentioned above but cyclone 2a-2c of the upper direction. In particular, when extracted from the upper cyclone 2a and the like, although the temperature is relatively low, since the high temperature cement raw material has a small amount of salt, the pyrolysis furnace 8 can be used without providing the dust cleaning device 12. After being discharged, it can be returned to the cyclone 2a, the dry mill or the cement raw material storage facility as it is.

It is a schematic block diagram which shows 1st Embodiment of the halogen-containing material fuelization system in the cement manufacturing equipment which concerns on this invention. It is a schematic block diagram of the principal part which shows the modification of embodiment of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cement kiln 1a Kiln bottom 1b In front of kiln 2 Preheater 2a, 2b, 2c, 2d Cyclone 4 Calciner 5 Sorting device 6 Waste fuel supply line 7 Pyrolysis line 8 Pyrolysis furnace (halogen separation means)
9 Sewage sludge supply pipe 10 Heat medium supply line 11 Return line 12 Dust cleaning device (dust cleaning means)
14 Gas scrubber (Halogen recovery means)
15 Gas supply line (gas supply means)
20 Chlorine bypass pipe 21 Bag filter

Claims (4)

A halogen-containing material fuelization system in a cement production facility having a preheater for preheating cement raw material and a cement kiln for firing the cement raw material introduced from the preheater,
A heat medium supply line for extracting a high-temperature cement raw material heated to 250 ° C. or higher from the upstream side of the cement kiln;
Halogen separation means for directly contacting a halogen-containing substance containing halogen to the high-temperature cement raw material supplied from the heat medium supply line to generate a combustible gas containing halogen and a residue,
Halogen recovery means for recovering the halogen from the combustible gas containing the halogen discharged from the halogen separation means;
A gas supply means for supplying the combustible gas after the halogen is recovered by the halogen recovery means as a fuel for the cement manufacturing facility;
A return line for returning the high temperature cement raw material and residue discharged from the halogen separation means to the upstream side of the cement kiln;
A halogen-containing material fueling system in a cement manufacturing facility. The preheater comprises a plurality of cyclones,
And the heat medium supply line is connected to the discharge side of the raw material of the cyclone at the lowest stage to which the cement raw material is supplied,
2. The cement production according to claim 1, wherein the return line is provided with dust cleaning means for cleaning the high temperature cement raw material and residues discharged from the halogen separation means to remove salts. Halogen-containing fuel system for equipment. A method for producing cement using the halogen-containing fuel conversion system according to claim 1 or 2,
When the cement raw material supplied from the preheater is fired by a burner provided in front of the kiln of the cement kiln to produce a clinker, the flammable gas after the halogen is recovered by the halogen recovery means, A cement production method using a halogen-containing material fueling system, wherein the cement production facility is supplied as a fuel.   4. The halogen-containing fuel system according to claim 3, wherein an adhesion preventing material for preventing the halogen-containing material and the high-temperature cement raw material from adhering to the halogen separating means is supplied to the halogen separating means. Cement production method using

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