WO2008056664A1

WO2008056664A1 - Method of disposing of organic waste of high water content and disposal apparatus therefor

Info

Publication number: WO2008056664A1
Application number: PCT/JP2007/071554
Authority: WO
Inventors: Kanehiro Saitou; Yukio Oka; Yutaka Okada; Kenji Kuninishi; Tomoyuki Kataoka; Mikio Nomura
Original assignee: Sumitomo Osaka Cement Co., Ltd.
Priority date: 2006-11-06
Filing date: 2007-11-06
Publication date: 2008-05-15
Also published as: KR20090091289A; US20100058963A1; TWI419847B; JP4987428B2; CN101528614A; CN101528614B; KR101287262B1; JP2008114173A; TW200838812A

Abstract

A method of disposing of an organic waste of high water content, and disposal apparatus therefor, with which effective utilization of the organic waste of high water content as fuel can be attained by drying the same with the use of cement calcination equipment, and with which the operation efficiency of cement calcination equipment can be enhanced without the danger of influences on the operation of the cement calcination equipment. The method of disposing of an organic waste of high water content comprises the steps of carrying out by means of heat exchanger (22) a heat exchange between superheated steam and exhaust gas separated by cyclone (2b) of suspension preheater (2) and not only introducing the superheated steam of high temperature after the heat exchange in dryer (23) to thereby dry any organic sludge into a dried organic waste but also carrying out once more by means of the heat exchanger (22) a heat exchange of the superheated steam after the drying to thereby attain circulatory use thereof in the drying of organic sludge; and feeding the resultant dried organic sludge to calciner (3) as fuel and combusting the same.

Description

Specification

High moisture content organic waste treatment method and treatment equipment

Technical field

TECHNICAL FIELD [0001] The present invention relates to a processing method and a processing apparatus for high water content organic waste, and more specifically, by drying the high water content organic waste using a cement firing facility. Waste can be effectively used as a fuel for cement firing facilities, but despite the use of gas extracted from the cement firing facility, there is no risk of adverse effects on the operation of the cement firing facility. The present invention relates to a processing method and a processing apparatus for high water content organic waste capable of improving the operation efficiency of a firing facility.

Yes

This application (May 2006, November 2006, No. 2006-300605, Japanese Patent Application No. 2006-300605, filed priority, and the contents of which are incorporated herein by reference.

Background art

Conventionally, in rotary kilns for cement firing facilities, combustible wastes such as waste tires and waste plastics are used among organic wastes as an alternative to fuel.

In addition, recently, high moisture content organic waste that can be finally burned but is incinerated by directly putting it into a rotary kiln is also used. As an example, organic hydrated (dehydrated) sludge such as sewage sludge can be cited as an example. This hydrated sludge is not subjected to pretreatment such as drying or additive addition. A sludge treatment method that is introduced into a furnace and incinerated has been proposed! (Patent Document 1).

In general, most of the organic water-containing sludge is occupied by moisture and organic matter, so the ash produced as a residue by incineration is very small. Therefore, even when organic water-containing sludge is directly fed into the rotary kiln, it can be incinerated in the rotary kiln without affecting the components of the cement cleansing power. [0003] By the way, in the method in which the organic water-containing sludge described above is directly introduced into the rotary kiln and incinerated, the raw material temperature in the kiln bottom of the rotary kiln decreases as the moisture in the water-containing sludge evaporates. Due to a decrease in the sensible heat of the raw material heated and decarboxylated in the preheater or calcining furnace, or a decrease in the temperature of the zone (kiln firing zone) where the cement raw material is sintered in the form of a crimp, There was a problem in that the ability to burn cement cleansing was extremely reduced. Furthermore, since the amount of heat and electric power used per unit of clinker at the time of cement-clinic power firing is high, there is a risk that economical operation becomes difficult.

Therefore, in order to reduce the impact of such high water content organic wastes on the operation of cement firing equipment, using the extraction gas from the clean power cooler of the cement firing equipment directly, In addition to processing to dry waste, effective use of dried organic waste as fuel is also being promoted! (Patent Document 2).

[0004] Fig. 3 is a schematic diagram showing a cement production facility equipped with a conventional high moisture content organic waste drying treatment equipment, which uses exhaust gas from a cement firing facility. It is an example of the apparatus which dries.

In the figure, 1 is a rotary kiln, 2 is a suspension preheater, 2a to 2d are suspension preheaters, 2 cyclones in each stage, 3 is a calcining furnace, 4 is a clean power cooler, 5 is an electric dust collector, and 6 is a suction fan. , 7 is an exhaust chimney, 8a to 8c are cooling air fans for the clean power cooler 4, 9 is a suction fan (IDF) for sucking exhaust gas from the suspension preheater 2, 10 is a secondary air duct for the calciner 3, and 11 is a clean air An exhaust duct of the force cooler 4, 12 is an exhaust duct of the suspension preheater 2, and 13 is a raw material supply line to the suspension preheater 2.

[0005] Further, 14 is a drying treatment apparatus, and an extraction duct 15 for extracting a part of the exhaust gas discharged from the clean power cooler 4 and a high water content organic waste are dried using the extracted exhaust gas. , A dust collector 17 that collects dust from the exhaust gas containing the dried organic waste, and an exhaust duct for reusing the exhaust gas after the dust collection as cooling air for the clean power cooler 4 18 and an exhaust introduction fan 19.

The dried organic waste obtained by the drying treatment apparatus 14 is effectively used as a fuel for cement burning equipment. [0006] By the way, the exhaust gas after drying contains a large amount of odor components, etc. The odor components, etc. are introduced into the clean power cooler of the cement firing equipment as high temperature clean power cooling air, By using the exhaust gas after cooling as secondary air for fuel combustion in a rotary kiln or calciner, it is completely burned and decomposed.

Therefore, even if the exhaust gas contains a large amount of odor components, a special deodorizing device that removes the odor components in the exhaust gas is not necessary.

[0007] In addition, as a drying device for high water content organic waste that does not depend on the direct drying method using the high-temperature gas, a high water content organic waste drying device using the superheated steam circulation method is cemented. A thing attached to the firing equipment has been proposed! (Patent Document 3).

This high water content organic waste drying device adjusts the water content by mixing and stirring the sludge cake made of high water content organic waste and mixing and stirring the circulating dry powder of sludge dried by airflow. After crushing with a crusher in the dryer, the product is dried in a drying duct and then collected with a cyclone to obtain a dry powder. A certain amount of the obtained dry powder is rotary on the cement firing equipment. It is blown into the kiln and used as part of the fuel for cement clean power firing.

In this apparatus, the heat medium for drying is exhaust gas (water vapor) generated by drying the sludge cake, and the high-temperature part of the cement baking equipment is the exhaust gas heating part for indirectly heating the exhaust gas. Introducing the above exhaust gas to heat 'deodorize, circulate a part of this heated' deodorized exhaust gas to the above crusher, bleed the increased exhaust gas out of the system, and heat and deodorize exhaust gas A heat exchanger is used for heat exchange between the remaining portion of the gas and the exhaust gas from the cyclone of the dryer, and the exhaust gas from the cyclone is preheated.

[0008] Further, as a method of treating waste different from organic waste with high water content, a waste fuel conversion system that treats halogen-containing waste using high-temperature gas in a cement firing facility is used. A method for producing cement has been proposed (Patent Document 4).

In this treatment method, the halogen-containing waste is thermally decomposed by indirect heating using high-temperature gas extracted from the suspension pre-heater of the cement firing equipment, and the generated halogen compounds are removed, while the combustible materials from which the halogen compounds have been removed are removed. Gas and residue are effectively used as fuel for cement burning equipment. In this waste fueling system, a high-temperature gas extracted from a suspension preheater is used as a heat source.

Usually, high-temperature gas in cement firing equipment includes high-temperature air extracted from the clean power cooler and high-temperature gas extracted from the bottom of the kiln of the rotary kiln. When the high-temperature gas extracted from the suspension preheater is used, it is possible to effectively use the heat source of the cement firing facility, which has a relatively small effect on the operation of the cement firing facility.

Patent Document 1: Japanese Patent Laid-Open No. 8-276199

Patent Document 2: Japanese Patent Laid-Open No. 63-151650

Patent Document 3: Japanese Patent Laid-Open No. 2002-273492

Patent Document 4: Japanese Unexamined Patent Publication No. 2006-206386

Disclosure of the invention

Problems to be solved by the invention

[0010] By the way, in the method of directly drying high water content organic waste using the extraction gas from the above-described cleansing power cooler of Patent Document 2, a large amount of water vapor is contained in the exhaust gas after drying. Therefore, when treated with a clean power cooler, the water vapor contained in the exhaust gas is introduced into the rotary kiln and calciner, and as a result, the amount of high-temperature gas (gas) required to burn the unit cement clean power There was a problem that the basic unit) increased.

This increase in gas unit consumption may adversely affect the operation of cement burning equipment, such as a decrease in the amount of cement cleansing fire and an increase in the calorific value for calcining (heat intensity unit).

This reduction in the amount of calcined cement fired and the increase in calorific value has an impact on the operation of 20-40% compared to the case of direct injection into the kiln bottom of a conventional rotary kiln. However, the adverse effects on operations are still significant, and there is a risk that the required amount of cement production cannot be obtained with the increase in the treatment of high water content organic waste.

[0011] Further, in the drying method of Patent Document 3, since the high-temperature part of the cement baking equipment body is used as a heating part (heat exchange part) for heating a heat medium used for drying, it can be used as a heating part. The high temperature portion is limited to the lower region of the suspension preheater and the high temperature region of the upstream portion of the cleansing cooler. If selected, the heat medium will take away a large amount of sensible heat from the gas inside the cement firing equipment and the heating raw material. Therefore, there has been a problem that the unit of calorific power of the clinching power firing of the cement firing equipment may be deteriorated and the strength and the clinching power firing ability may be lowered.

[0012] Similarly, the decrease in the amount of cement cleansing power and the increase in the calorific value of the cement firing facility are the reduction in the amount of cleansing of the clean power compared to the case where it is directly input to the kiln bottom of the rotary kiln. Although the rate is limited to ~ 50%, the increase in the calorific value becomes 80%. In other words, in this method, most of the drying heat source is obtained by depriving the cement calcining facility of useful heat, so that compared to the method using exhaust gas etc. of other cement calcining facilities, The problem is that if the heat consumption in the facility is greatly deteriorated, the required cement production cannot be obtained! There was a point.

[0013] Further, in the waste fuel conversion system of Patent Document 4, in order to thermally decompose and separate halogen-containing waste, it is necessary to heat the halogen-containing waste to a maximum temperature of 650 ° C. In addition, the temperature of the high-temperature gas introduced into the indirect heater that thermally decomposes the halogen-containing waste must be further increased.

In addition, because of the indirect heating, the temperature of the exhaust gas after heat exchange, which is not sufficient for heat transfer, is returned to the suspension preheater while maintaining a high temperature. In particular, the exhaust gas in the high temperature state is joined to the exhaust duct of the suspension preheater. In such a case, the temperature of the exhaust gas from the suspension preheater may increase, leading to a reduction in the gas processing capacity of the suction fan (IDF) and, in turn, a reduction in the production capacity of the cement firing equipment.

In addition, since the extracted hot gas is discharged from the suspension preheater without reusing its sensible heat, the calorific intensity of cement firing also deteriorates.

[0014] Thus, in the treatment methods and systems of Patent Documents 2 to 4, when high moisture content organic waste is combusted using a cement firing facility, it may adversely affect the operation of the cement firing facility. There is. Therefore, the dry organic waste obtained by drying organic waste with high water content can be effectively used as fuel for cement firing equipment, and the heat source extracted from the cement firing equipment can also be used. Even if it is dried, it has no influence on the operation of the cement firing equipment. The treatment method of high water content organic waste is desired! /.

[0015] The present invention has been made in order to solve the above-described problems, and the high water content organic waste such as sewage sludge is dried by using a cement firing facility. High water content that can effectively use organic waste as a fuel for cement firing equipment, and there is no risk of affecting the operation of cement firing equipment. To provide organic waste treatment methods and treatment equipment.

Means for solving the problem

[0016] As a result of intensive studies to solve the above-mentioned problems, the present inventors have dried a high water content organic waste using a heat medium exchanging heat with a high-temperature gas collected from a cement firing facility. This dry organic waste is then recycled, and the dried heating medium is heat-exchanged with high-temperature gas again and recycled for drying high-water content organic waste. Or, if it is supplied to the combustion device and burned, this dry organic waste can be used effectively as a fuel for cement burning equipment, and the residue after combustion can be used as a raw material for cement clinker. As a result, the present inventors have found that there is no risk of adversely affecting the operation of cement firing equipment and cement quality.

[0017] That is, the high water content organic waste treatment method of the present invention is a treatment method for fueling and burning high water content organic waste using a cement firing facility, The high water content organic waste is dried to a dry organic waste by using a heat medium exchanging heat with the high temperature gas collected from the firing facility, and the dried heat medium is again used as the high temperature gas. A drying process that heat-exchanges and circulates to dry the high water content organic waste, and a combustion process that supplies the dried organic waste to the cement burning facility or combustion device and burns it. It is characterized by that.

[0018] In this high water content organic waste processing method, the high water content organic waste is dried using a heat medium exchanging heat with a high temperature gas collected from a cement firing facility, and dried organic waste. Therefore, the exhaust gas generated by this drying is only water vapor. Therefore, even when this exhaust gas is processed by the cement firing equipment, there is no risk of affecting the operation of the cement firing equipment. Organic waste is a fuel for cement burning equipment. It is used effectively.

Further, since the dried heat medium is again heat-exchanged with a high-temperature gas and recycled for drying high-water-content organic waste, the heat medium is reused efficiently and effectively, and there is no waste.

[0019] In the method for treating high water content organic waste according to the present invention, in the combustion step, the dry organic waste is disposed at one or more of a rotary kiln, a calciner, and a suspension preheater of the cement firing facility. It is a process of supplying and burning. In this high moisture content organic waste vehicle treatment method, dry organic waste is supplied to one or more of the rotary kiln, calciner and suspension preheater of the cement firing facility and burned. Waste can be effectively used as a fuel for cement clean power firing, and since it is dry, there will be no impact on the operation of cement firing facilities.

[0020] In the method for treating high water content organic waste according to the present invention, the high temperature gas is obtained by extracting from one or more of the cyclone gas outlets of each stage of the suspension preheater of the cement burning equipment. The heating medium after drying is superheated steam generated by drying the high water content organic waste.

[0021] In this high moisture content organic waste treatment method, the high temperature gas collected from the cement firing facility is extracted from one or more of the cyclone gas outlets of the suspension preheater of the cement firing facility. By using the obtained high-temperature gas, the amount of gas passing through the cement firing device is increased, and the cement crimping power firing ability of the cement firing device can be improved.

In addition, the heating medium after drying is superheated steam generated by drying organic waste with a high water content, so that the heating medium used directly in the drying process can be minimized and the cement firing equipment No impact on operations.

[0022] In the method for treating high water content organic waste according to the present invention, the high-temperature gas is exhaust gas discharged from a suspension preheater of the cement burning equipment, or extracted gas extracted from a clinker cooler of the cement firing equipment. Any one of the above, 1 type or 2 types, and the heating medium after drying is superheated steam generated by drying the high water content organic waste. [0023] In this high water content organic waste treatment method, the high-temperature gas collected from the cement firing facility is extracted from the exhaust gas that also discharges the suspension preheater force of the cement firing facility, and the cleansing cooler of the cement firing facility. By using either one or two of the bleed gas, there is no possibility of adversely affecting the operation of the cement firing equipment by using high-temperature gas.

In addition, by using superheated steam generated by drying high water content organic waste as the heat medium after drying, the amount of gas used in the drying process can be minimized, and the strength and strength can be reduced. There is no impact on the operation of the firing equipment.

[0024] The high water content organic waste processing method of the present invention is characterized in that a part of the superheated steam is extracted and deodorized, and then introduced into the cement firing facility.

In this high water content organic waste treatment method, a part of superheated steam is extracted and deodorized, and then introduced into a cement firing facility. The impact on the operation of the cement firing equipment by the ash can be eliminated at all, and the operation of the cement firing equipment results in the remarkable improvement in the cement cleansing power firing capability due to the extraction of the cyclone gas outlets mentioned above. .

[0025] The high water content organic waste treatment method of the present invention is characterized in that a part of the superheated steam is directly introduced into a portion of the cement firing facility at 800 ° C or higher.

In this high water content organic waste treatment method, a part of superheated steam is directly introduced into the cement firing facility at a temperature of 800 ° C or higher, so that the amount of superheated steam introduced is only the amount generated by drying. The impact on the operation of the cement firing facility is extremely small. By improving the cement-criminal power firing capability by extracting air from the cyclone gas outlet at each stage described above, it is possible to sufficiently counteract the impact.

[0026] The high water content organic waste processing apparatus of the present invention is a processing apparatus for fuelizing and burning high water content organic waste using a cement firing facility, wherein the cement Heat exchange means for exchanging heat between the high-temperature gas collected from the firing facility and the heat medium, and drying the high water content organic waste using the heat exchanged heat medium and the dried organic waste Drying treatment means, a circulation line for circulating the dried heat medium between the heat exchanging means and the drying treatment means, and the dried organic waste as the cement baking equipment. And a supply line for supplying to the combustion device.

[0027] In this high water content organic waste treatment apparatus, heat exchange is performed between the high-temperature gas separated from the cement firing facility and the heat medium by the heat exchange means, and this heat treatment is performed by the drying treatment means. The high-moisture content organic waste is dried to dry organic waste using the exchanged heat medium, and this dry organic waste is supplied to a cement firing facility or a combustion device through a supply line to perform combustion treatment. .

This improves the sintering capacity of the cement cleansing power that does not affect the operation of the cement burning equipment.

In addition, the dry organic waste obtained by effectively using the sensible heat of the exhaust gas that is also discharged by the cement baking equipment is effectively used as a fuel for cement burning equipment. The heat medium can be reused efficiently and effectively by exchanging heat with the high-temperature gas again and recycling it to dry organic waste with a high water content.

[0028] The high moisture content organic waste processing apparatus of the present invention comprises a deodorizing means for extracting a part of the superheated steam generated by the drying means and subjecting the extracted superheated steam to a deodorizing process. It is characterized by becoming.

In this high moisture content organic waste processing apparatus, a part of the superheated steam generated by the drying means is extracted by the deodorizing means, and the extracted superheated steam is subjected to a deodorizing process. As a result, only high-temperature water vapor from which odorous components have been removed can be supplied to the suspension preheater exhaust gas system of the cement firing equipment, and there is no impact on the operation of the cement firing equipment.

[0029] The high moisture content organic waste processing apparatus of the present invention extracts a part of the superheated steam generated by the drying means, and the extracted superheated steam is heated to 800 ° C or more of the cement firing facility. It is characterized by having a deodorization treatment line that is directly introduced into the place and performs deodorization treatment. In this high water content organic waste treatment device, a part of the superheated steam generated by the drying means is extracted by the deodorization treatment line, and then directly introduced into the cement firing facility at a temperature of 800 ° C or higher. By performing deodorizing treatment of steam, it can also be used for simple deodorizing treatment of superheated steam. Regardless, it is possible to efficiently treat high water content organic waste.

[0030] The high moisture content organic waste processing apparatus of the present invention is the above-described one of the power of the cyclone gas outlet of each suspension preheater of the cement baking equipment, and the extraction gas separated from one or more locations as a high temperature gas. This high water content organic waste treatment device is characterized by comprising a line to be introduced into the heat exchange means, and the suspension preheater in each stage of the suspension preheater of the cement firing equipment is provided by a line to be introduced into the heat exchange means for the high temperature gas. The ability to ventilate cement firing equipment can be improved by separating hot gas from one or more locations at the gas outlet, and this is due to the operation of this high moisture content organic waste treatment system. There is no risk of deterioration of the cement cleansing ability, and organic waste with high water content can be treated efficiently.

[0031] The high water content organic waste treatment apparatus of the present invention includes a line for introducing the exhaust gas from the suspension preheater of the cement firing equipment into the heat exchange means as a high-temperature gas, and a crimping power cooler of the cement firing equipment. One or both of the lines for introducing the extracted gas extracted into the heat exchanging means as a high-temperature gas are provided.

[0032] In this high moisture content organic waste treatment device, the exhaust gas collected from the suspension preheater is introduced into the heat exchange means as a high-temperature gas, and the extraction gas extracted from the clean power cooler is used as the high-temperature gas for heat exchange. By providing either one or both of the lines to be introduced to the means, it is possible to use the exhaust gas separated from the suspension preheater or the extraction gas extracted from the clinker cooler as a high-temperature gas, and also to exchange heat. By using the high-temperature gas after replacement again for drying the cement raw material, it can be used efficiently and effectively, and the influence on the operation of the cement firing equipment can be eliminated.

[0033] According to the method for treating high water content organic waste of the present invention, the high water content organic waste is dried and dried using a heat medium exchanging heat with a high-temperature gas collected from a cement firing facility. Because it is a mechanical waste, it is possible to effectively use the dry organic waste obtained without fear of affecting the operation of the cement firing equipment as the fuel for the cement firing equipment. In addition, since the dried heat medium is again heat-exchanged with a high-temperature gas and recycled for drying high water content organic waste, the heat medium can be reused efficiently and effectively.

[0034] According to the high water content organic waste treatment apparatus of the present invention, heat exchange means for exchanging heat between the high-temperature gas collected from the cement firing facility and the heat medium, and the heat-exchanged heat A drying process means that dries the high water content organic waste using a medium to form a dry organic waste, and the dried heat medium is circulated between the heat exchange means and the drying treatment means. A circulation line and a supply line for supplying the dried organic waste to the cement firing facility or combustion apparatus, so that the sensible heat of the exhaust gas discharged from the cement firing facility can be used effectively. In addition, there is no risk of affecting the operation of the cement firing equipment, and the cement clinching power firing ability of the cement firing equipment can be improved.

In addition, since the dried heat medium is again heat-exchanged with a high-temperature gas and recycled for drying high water content organic waste, the heat medium can be reused efficiently and effectively.

Brief Description of Drawings

FIG. 1 is a schematic diagram showing a cement burning facility provided with an organic sludge treatment apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic view showing a cement burning facility provided with an organic sludge treatment apparatus according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram showing a cement production facility equipped with a conventional high water content organic waste drying treatment apparatus.

Explanation of symbols

[0036] 1 Rotary quinolene

2a ~ 2d cyclone

3 Calciner

4 Clin power cooler

5 Electric dust collector

6 Suction fan

7 Exhaust chimney 8a ~ 8c cooling air fan

9 Suction fan (IDF)

10 Secondary air duct

11 Exhaust duct

12 Exhaust duct

13 Raw material supply line

21 Organic sludge treatment equipment

22 Heat exchanger

23 Dryer

24 Deodorizer

25 Hopper

26 Hot gas bleed duct

27 Exhaust duct

28 Superheated steam line

29 Superheated steam line

30 Organic sludge supply line

31 Supply line

41 Organic sludge treatment equipment

42 Hot gas extraction line

43 Hot gas exhaust line

BEST MODE FOR CARRYING OUT THE INVENTION

[0037] The best mode of the high moisture content organic waste processing method and processing apparatus of the present invention will be described with reference to the drawings.

This embodiment is specifically described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified.

[0038] "First Embodiment"

FIG. 1 is a schematic diagram showing a cement firing facility equipped with a high water content organic waste treatment apparatus according to the first embodiment of the present invention, in which organic sludge is used as a high water content organic waste. This is an example of a treatment apparatus that dries this organic sludge using exhaust gas from a cement firing facility or extracted high temperature gas into fuel, and burns the resulting dried organic sludge using a cement firing facility.

[0039] In the figure, 21 is an organic sludge treatment device, which is a heat exchanger that exchanges heat between exhaust gas (high-temperature gas) and steam (heat medium) collected from the suspension preheater 2 of the cement firing equipment ( (Heat exchange means) 22, a dryer (drying means) 23 that dries organic sludge using this heat-exchanged superheated steam (heat medium) to dry organic sludge, and a deodorizer that deodorizes the superheated steam (Deodorizing means) 24, hopper 25 for storing dried organic sludge, hot gas extraction duct (line) 26, exhaust duct (line) 27, superheated steam line (circulation line) 28, superheated steam Line (bleeding line) 29, organic sludge supply line 30 for supplying organic sludge to dryer 23, and supply line 31 for supplying dry organic sludge to calciner 3.

[0040] In order to dry and burn the organic sludge using this organic sludge treatment device 21, the high-temperature gas and superheated steam line 28 separated from the gas outlet of the second-stage cyclone 2b of the suspension preheater 2 are circulated. Steam (heat medium) is introduced into the heat exchanger 22, and the steam is heated by this high-temperature gas to form superheated steam (heat medium).

The superheated steam is introduced into the dryer 23 via the superheated steam line 28, and the organic sludge introduced by the organic sludge supply line 30 is dried in the dryer 23 to obtain dried organic sludge. The dried organic sludge is temporarily stored in the hopper 25, and then supplied as fuel to the calciner 3 through the supply line 31, and is combusted.

[0041] This organic sludge treatment apparatus 21 uses a high-temperature gas extracted from the outlet gas of the second-stage cyclone 2b from the uppermost-stage cyclone 2a of the suspension preheater 2 to dry the steam by heat exchange. In other words, by adopting a drying method based on the superheated steam circulation method, effective utilization of the high-temperature gas in the cement firing facility and efficiency improvement of the cement firing facility are being attempted.

[0042] Here, selection of extraction positions in the cyclones 2a to 2d will be described.

For example, when the exhaust gas from the second-stage cyclone 2b is also extracted, the exhaust gas temperature of the suspension preheater 2 is decreased by extracting rather than the effective utilization of the exhaust gas at the outlet of the cyclone 2b is low. Compensates for heat loss due to exhaust gas, There is no increase in the basic unit.

At the same time, the temperature of the extracted exhaust gas is lowered due to heat exchange in the dryer 23, and the ventilation capacity of the suction fan (IDF) 9 that sucks the gas combined with the exhaust gas from the suspension preheater 2 is increased.

As a result, the clinching power firing ability of the cement firing equipment is increased. In some cases, the calorific intensity can be improved by the improvement of the clinching ability.

[0043] The improvement effect of the clean power firing capacity is the force S that increases as the extraction position of the exhaust gas becomes the lower cyclone, and in the lower cyclone, the amount of heat loss due to the extraction gas increases, which has an effect on the heat intensity. However, the rate of increase in the capacity for clinching of cement firing facilities will decrease. Therefore, the cyclone to be extracted is most preferably the second-stage cyclone 2b, and the third-stage cyclone 2c is the second most preferred.

The above effect can be obtained even if exhaust gas from the outlet of the uppermost cyclone 2a is used. In this case, it is necessary that the extraction device for extracting the exhaust gas from the cyclone 2a does not increase the ventilation resistance of the suspension preheater 2 to the exhaust gas. As a countermeasure, a heat exchanger is connected to the exhaust duct 12 of the suspension preheater 2. Is attached.

[0044] The temperature of the hot gas extracted from the gas outlet force of the second-stage cyclone 2b is usually in the range of 550 to 650 ° C. This high-temperature gas is obtained by extracting from a position where the powder raw material input by the raw material supply line 13 for cement powder raw material is not mixed. The amount of high-temperature gas to be extracted is sufficient for the amount of heat required to evaporate the moisture contained in the organic sludge and make it into superheated steam, since the moisture content of the organic sludge to be dried is about 80% by weight. A sufficient amount is needed. In other words, it is necessary to extract a gas amount of usually 4 to 8 Nm ³ per kg of organic sludge.

[0045] Further, when the concentration of dust in the exhaust gas to be extracted is high, or when a large amount of volatile components that cause the subsequent heat exchanger 22 are contained, the hot gas extraction duct 2 6 It is preferable to attach a dust collector such as a cyclone.

In addition, a dust collector such as a cyclone is attached to the outside 27 of the exhaust duct, and the dust in the exhaust gas after being cooled by this heat exchanger 22 is collected by the dust collector, so that it can be collected in the subsequent suction fan (IDF) 9 etc. You may prevent that a volatile component adheres. [0046] The high-temperature gas extracted from the suspension preheater 2 is further heated by the heat exchanger 22 to the superheated steam having a temperature of 130 to 200 ° C discharged from the dryer 23, which is the drying heat medium circulating. 400. Caro heats up to C.

The temperature of the hot gas is lowered to 300 to 350 ° C. by this heat exchange, and merges with the exhaust gas from the suspension preheater 2 through the exhaust duct 12.

In order to increase the amount of heat exchange in the heat exchanger 22, the heat transfer area of the heat exchanger 22 may be increased. However, if the exhaust gas after heat exchange is used for drying cement raw materials, or When using as a heat source for boilers of exhaust heat power generators, it is not always necessary to increase the heat transfer area and greatly reduce the gas temperature after heat exchange. Considering these conditions, the structure of the heat exchanger 22 is preferably a multi-tube heat exchanger, a plate heat exchanger, or the like.

[0047] The high-temperature gas whose temperature has decreased due to heat exchange in the heat exchanger 22 is introduced into the exhaust duct 12 of the suspension preheater 2 and merges with the exhaust gas from the suspension preheater 2.

Here, for example, if the exhaust gas temperature after heat exchange that is sufficient for heat exchange in the heat exchanger 22 is higher by 150 ° C or more than the exhaust gas temperature of the suspension preheater 2, the exhaust gas temperature rises after the merge. As the degree of air flow increases and the air blowing capacity decreases as the suction gas temperature of the suction fan (IDF) 9 increases, there is no room for improvement in the firing capacity of the cement clinker 1 of the cement firing equipment. There is a risk that the sensible heat loss of the extracted hot gas will increase, and the calorific value will deteriorate.

[0048] The upper limit value of the high temperature gas temperature after heat exchange is set to a predetermined area as the heat transfer area of the heat exchanger 22, so that the upper limit value of the high temperature gas temperature after the heat exchange is set to the suspension preheater 2 The temperature is preferably 150 ° C higher than the exhaust gas temperature. More preferably, the upper limit is a temperature 100 ° C higher. If the gas is cooled to a temperature below this upper limit, the gas temperature after merging with the suspension preheater exhaust gas will decrease.

For example, when the exhaust gas from the suspension preheater 2 and the hot gas after heat exchange are merged, the temperature after the heat exchange is merged, the temperature after merging is not extracted. The suction fan (IDF) 9 It is possible to further increase the attractive force.

[0049] This is because the temperature of the high-temperature gas extracted from the gas outlet of the second-stage cyclone 2b (550 to 6500 ° C) force heat exchange is a maximum of 100 from the exhaust gas temperature of the suspension preheater 2 (about 350 ° C). If the temperature drops to below 150 ° C (upper limit 450-500 ° C), the gas temperature after merging will be lower than before extraction. Further, by extracting the high-temperature gas, the pressure loss due to the gas passing through the uppermost cyclone 2a is also reduced. Therefore, the suction force of the suction fan (IDF) 9 is further increased, and the cement cleansing ability is increased. It can be improved.

Considering these points, even if the performance of the heat exchanger is not high, the high-temperature gas extracted to the specified temperature can be easily reduced, so the organic sludge treatment equipment must be downsized and simplified. Can do.

[0050] On the other hand, the high water content organic sludge supplied to the dryer 23 by the organic sludge supply line 30 has a boiling point of water or its boiling point by superheated steam circulating between the dryer 23 and the superheated steam line 28. It becomes a dry organic sludge which is heated to the vicinity and has a reduced moisture content. Here, in order to increase the dryness of the dried organic sludge, it is necessary to increase the temperature until the drying of the organic sludge reaches a dry rate. Normally, the temperature of the organic sludge during heating is 100 ° C. Dried organic sludge with a moisture content of 5 to 10% can be easily obtained in a constant-rate dry state while maintaining a temperature of about C, so that it is excessively high as a heating medium for the drying unit, and superheated steam at a temperature is required Dena,

Moreover, the dry sludge burned in the cement burning equipment can fulfill its performance as a fuel even at a moisture content of 5 to 10%.

[0051] Therefore, the feature of this embodiment is that the temperature of the hot gas after heat exchange in the heat exchanger 22 that does not require the temperature of the heat medium of the drying device to be excessively high can be reduced. It is in the point. In other words, it is easy to lower the temperature of the hot gas below the exhaust gas temperature of the suspension preheater 2, and the temperature after the exhaust gas of the suspension preheater 2 and this gas are combined decreases, and the suction fan (IDF) 9 It is possible to increase the gas flow rate.

[0052] As the dryer 23, an air dryer, a fluidized bed dryer, or the like can be used. It is possible to control the drying degree relatively easily with less dust contained in the exhaust gas after drying. A material transfer type hot air type multi-stage dryer is preferred.

The dried organic sludge obtained in this way is temporarily stored in the hopper 25, then pneumatically transported through the supply line 31, and introduced into the calcining furnace 3 as a fuel for combustion treatment.

[0053] On the other hand, after the superheated steam evaporated from the organic sludge in the dryer 23 is joined to the circulating superheated steam, a part of the superheated steam is sent to the deodorizer 24 via the superheated steam line 29 to be deodorized. After that, it rejoins the exhaust gas line 12 of the suspension preheater 2 and is used for drying the cement raw material.

[0054] As described above, according to the organic sludge treatment method of the present embodiment, the dried organic sludge obtained without fear of affecting the operation of the cement firing facility is used as the calcining furnace of the cement firing facility. It can be used effectively as a third fuel.

Further, since the superheated steam after drying is again heat-exchanged with exhaust gas and recycled for drying organic sludge, the superheated steam can be reused efficiently and effectively.

[0055] According to the organic sludge treatment apparatus of the present embodiment, the sensible heat of the high-temperature gas extracted from the suspension preheater 2 of the cement firing facility can be effectively used for the operation of the cement firing facility. It can improve the burning capacity of cement cleansing power of cement burning equipment that has no risk of influence.

In addition, since the superheated steam after drying is exchanged with high-temperature exhaust gas again and recycled for drying organic sludge, the superheated steam can be reused efficiently and effectively.

[0056] Instead of sending a part of the superheated steam to the deodorizer 24, this superheated steam is passed from the gas outlet of the lowermost cyclone 2d of the suspension preheater 2 to the upper cyclone 2c of the lowermost cyclone 2d, Alternatively, the odor components may be directly decomposed into the cooling air inlet of the clean power cooler 4 and thermally decomposed through a high temperature portion of 800 ° C or higher in the cement baking equipment. It is possible to keep the cement burning equipment in a state that does not adversely affect the operation.

In other words, it is preferable to introduce a part of the superheated steam directly into the cement firing facility at a temperature of 800 ° C or higher. The amount of superheated steam introduced by this is only the amount generated by drying. The impact on the operation is extremely small.By improving the cement-clinic power firing capability by extracting air from the above-mentioned cyclone gas outlets, the impact can be fully counteracted. It becomes possible.

The location where the temperature is 800 ° C or higher in the cement firing equipment differs depending on the form of the cement firing equipment, and the upper limit temperature is not particularly limited, but it is usually 1600 ° C in the hottest part. It has become. Therefore, the superheated steam may be introduced directly into the cement burning facility at a temperature range of 800 to 1600 ° C.

[0057] Instead of sending some of the heated steam to the deodorizer 24, the superheated steam may be recovered as moisture by cooling it with a condenser or the like, and the recovered moisture is included. It can be used as wastewater treatment to decompose odor components, etc., and again to be used in cement production facilities.

[Second Embodiment]

FIG. 2 is a schematic view showing a cement burning facility provided with an organic sludge treatment apparatus according to the second embodiment of the present invention. This organic sludge treatment apparatus 41 is used to treat organic sludge according to the first embodiment. The difference from the device 21 is that the hot gas bleed duct 26 and the exhaust duct 27 are replaced with the hot gas bleed line 42 and the hot gas exhaust line 43, and the hot gas used for drying of the dryer 23 is the suction fan of the suspension preheater 2. (IDF) 9 This is the point where the exhaust duct 12 force downstream of 9 and the hot exhaust gas branched off.

[0059] In the organic sludge treatment apparatus 41, high-temperature exhaust gas serving as a heat source for drying is branched from the exhaust duct 12 of the suspension preheater 2 and sent to the heat exchanger 22 through the high-temperature gas extraction line 42. This exhaust gas contains almost no chlorine gas, SO and other volatile components volatilized in the high-temperature part of the cement firing equipment, and the dust content is relatively low, so it is sent to the heat exchanger 22. It is not necessary to remove these components before they are used.

The exhaust gas from the suspension preheater 2 is introduced into the heat exchanger 22 at a temperature of about 350 to 400 ° C, cooled to about 200 ° C after heat exchange with the superheated steam, and then deodorized by the deodorizer 24. As with some of the superheated steam that has been decomposed and removed, it is recombined with the exhaust gas from the suspension preheater 2 in the exhaust duct 12 of the suspension preheater 2.

Yes

[0060] According to the organic sludge treatment apparatus 41, the high-temperature gas used for drying of the dryer 23 is suspended. Since it is a high-temperature exhaust gas branched from the exhaust duct 12 downstream of the suction fan (IDF) 9 of the pension preheater 2, it can be introduced at the same position after heat exchange and temperature drop. Also, since the superheated steam generated by drying organic sludge is deodorized and then introduced into the exhaust duct 12, the cement firing facility has no effect on gas ventilation in the cement firing facility. The power S can be used to treat organic sludge without affecting operations.

Industrial applicability

The method and apparatus for treating high water content organic waste of the present invention can be used in cement burning facilities, and efficiently treats high water content organic waste such as sewage sludge discharged in various industrial fields. Can be processed automatically. In addition, the resulting dried organic waste can be used effectively as a fuel for cement firing equipment, and the residue after firing is used as a raw material for cement clinker. Since the present invention can be effectively reused, the present invention can also contribute to resource saving, which is a problem in general industrial fields. Therefore, the present invention has extremely high industrial applicability.

Claims

The scope of the claims

[1] A processing method for converting a high water content organic waste into fuel and combustion using a cement firing facility,

The high water content organic waste is dried to a dry organic waste by using a heat medium exchanging heat with the high temperature gas collected from the cement burning facility, and the dried heat medium is again the high temperature. A drying process in which heat is exchanged with gas and recycled to dry the high water content organic waste;

A method for treating high water content organic waste, comprising: a combustion step of supplying the dry organic waste to the cement burning facility or combustion apparatus and burning it.

[2] The combustion step is a step in which the dry organic waste is supplied to one or more of a rotary kiln, a calcining furnace, and a suspension preheater of the cement burning equipment and burned. The method for treating a high water content organic waste according to claim 1.

[3] The high-temperature gas is a high-temperature gas obtained by extracting from any one or more of the cyclone gas outlets of each stage of the suspension preheater of the cement firing facility, and the heat medium after drying is 3. The method for treating a high water content organic waste according to claim 2, which is superheated steam generated by drying the high water content organic waste.

[4] The high-temperature gas is one or two of exhaust gas discharged from a suspension preheater of the cement firing facility, and extracted gas extracted from a cleansing cooler of the cement firing facility.

3. The method for treating high water content organic waste according to claim 2, wherein the heat medium after drying is superheated steam generated by drying the high water content organic waste.

5. The method for treating high water content organic waste according to claim 3 or 4, wherein a part of the superheated steam is extracted and deodorized, and then introduced into the cement firing facility.

6. The method for treating high water content organic waste according to claim 3, wherein a part of the superheated steam is directly introduced into a portion of the cement firing facility at 800 ° C or higher.

[7] For converting high-moisture content organic waste into fuel and burning using cement firing equipment A processing device,

Heat exchange means for exchanging heat between the high-temperature gas collected from the cement firing facility and the heat medium, and drying the high water content organic waste using the heat exchanged heat medium A drying treatment means to be a product, a circulation line for circulating the dried heat medium between the heat exchange means and the drying treatment means, and the dried organic waste to the cement baking equipment or the combustion device. A high water content organic waste treatment apparatus, characterized in that it comprises a supply line for supplying to the waste water.

[8] The high moisture content according to claim 7, further comprising a deodorization treatment means for extracting a part of the superheated steam generated by the drying means and deodorizing the extracted superheated steam. Organic waste treatment equipment.

[9] A deodorizing treatment line for extracting a part of the superheated steam generated by the drying means and introducing the extracted superheated steam directly into the above-mentioned cement firing facility at a temperature of 800 ° C or higher is provided. The apparatus for treating a high water content organic waste product according to claim 7, comprising:

Yes

[10] A suspension pre-heater of the cement firing facility is provided with a line for introducing extracted gas taken from one or more of the cyclone gas outlets as a high-temperature gas into the heat exchanging means. The processing apparatus for organic waste with high water content according to claim 7, 8 or 9.

[11] A line for introducing the exhaust gas from the suspension preheater of the cement firing equipment into the heat exchange means as a high-temperature gas, and a line for introducing the extraction gas extracted from the cleansing cooler of the cement firing equipment into the heat exchange means as a high-temperature gas. 9. The high water content organic waste treatment apparatus according to claim 7 or 8, comprising either or both of the above.