WO2008038992A1

WO2008038992A1 - A deposited industrial waste thermodecomposition apparatus and decomposition method using thereof

Info

Publication number: WO2008038992A1
Application number: PCT/KR2007/004694
Authority: WO
Inventors: Gil Hyun Ahn
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-09-26
Filing date: 2007-09-21
Publication date: 2008-04-03
Anticipated expiration: 2009-03-26
Also published as: KR100684585B1; CN101516536A; CN101516536B

Abstract

The present invention relates to a stackable type integral pyrolysis incineration apparatus: comprising an incineration furnace for incinerating waste; a combustion furnace for heating the incineration furnace; and a residual sludge tank disposed above the incineration furnace for producing water vapor with waste heat of the lower incineration furnace to collect gas produced from the incineration furnace to thereby form residual sludge. In addition, according to the present invention, there is also provided a method of treating waste comprising the steps of: heating the waste indirectly in an incineration furnace thereby pyrolyzing the waste; producing water vapor in a residual sludge tank by using heat produced from the incineration furnace; and collecting waste gas produced during the pyrolysis by using the water vapor.

Description

A DEPOSITED INDUSTRIAL WASTE THERMO-DE-

COMPOSITION APPARATUS AND DECOMPOSITION

METHOD USING THEREOF

Technical Field

[1] The present invention relates to a waste incineration apparatus, and more particularly, to a waste incineration apparatus, which is constructed by integrating a waste incineration furnace for pyrolyzing organic waste and a dust collector. Background Art

[2] As well known in the field of the relevant art, studies about a method for treating waste, which can reduce environmental contamination, and a method for recycling waste actively by using diverse methods, have been progressed, since concerns about environments has increased as lives have become well-off according to the rapid development of the world. Among them, the methods of treating the organic waste can be classified into a method of incinerating the waste at high temperature heat, and a method of making compost by using the earthworm or an aerobe, an anaerobe, and the like.

[3] However, while the incineration method has an advantage that abundant waste could be treated within a short time, there were disadvantages that cost for treating the waste was high and it was not possible to recycle resources. Also, with regard to the method of recycling waste as compost, while there were advantages that organic waste could be treated at low cost and the organic waste could be recycled, there were also disadvantages that the waste could not be treated quickly, a wide space was required for making the compost, and bad smell was produced during the making of the compost from the waste.

[4] In addition, conventional organic waste incineration apparatus was classified into a method of direct combusting type incineration, in which organic waste was incinerated by direct combustion with flames from the combustion device, and a method of indirect combustion type incineration, in which a heating chamber or a heating drum was heated to high temperature with combustion heat from a combustion device so that organic waste charged into the heating chamber or the heating drum could be indirectly heated thereby being incinerated.

[5] However, use of such apparatus was drastically reduced in the direct combustion type incineration apparatus, because environmental contaminant material contained in the discharge gas was abundantly produced from the incomplete combustion, and it was substantially difficult to remove the environmental contaminant material, while there was an advantage that the structure of the device became substantially simple because the combustion method was simple.

[6] Whereas, the use of the indirect combustion type incineration apparatus (pyrolysis apparatus) has been gradually increased due to advantages that it is easy to remove the environmental contaminant material, and the pyrolysis gas produced from the incineration of the waste could be diversely recycled, since the discharge gas from the combustor, produced from the combustion of the waste, and the pyrolysis gas from the organic waste have been separately treated.

[7] However, there is a basic problem that the incineration apparatus for treating waste, such as a pyrolysis treatment apparatus has discharged harmful gas to the outside thereby contaminating human bodies and the circumferential environment. It becomes a big issue to incinerate waste in addition to post-treat harmful gas produced from the incineration because the discharge gas contains materials such as dioxin or PFC (a total term of perfluoro compound such as CF4, C2F6, SF6, NF3, C3F8, and the like), which effects to the warming of the earth.

[8] As a result, developments for a post- treatment process have been carried out, and finally, there have been developed methods of passing through a residual sludge tank before discharge or secondary combusting the pyrolysis gas before discharge.

[9] In Korean Utility Model Registration No. 0226953, and Korean Utility Model Registration No. 0227664, there were disclosed methods of discharging gas finally through a residual sludge tank to remove environmental contaminant material contained in the discharge gas.

[10] Meanwhile, there was disclosed a waste incineration system constructed of a pyrolysis device and a device for treating harmful gas produced during the pyrolysis in a Korean Patent Laid Open Publication No. 2006-25065 filed by Auto MIT. The system is characterized by exchanging the combustion method into a plasma combustion method, in the conventional waste treating system comprising a pyrolysis furnace for primarily pyrolyzing waste; a mixing furnace for mixing gas produced during the pyrolysis furnace with air; a combustion furnace incinerating the mixed gas secondarily; a dust collection device for collecting dust of the gas and the waste incinerated secondarily in the combustion furnace; a cleaner for cleaning the gas collected in the dust collection device; and a neutralization device for treating harmful gas among the gas passed through the cleaning device, and the like.

[11] However, the above pyrolysis devices have problems that investment of a large scale should be accompanied with regard to a residual sludge tank, a plasma combustion device, a dioxin catalyst combustion device, and the like, together with modern combustion facilities. Accordingly, there has been required an easier and simpler pyrolysis incineration device continuously. Disclosure of Invention

Technical Problem

[12] Accordingly, the present invention has been made to solve such conventional problems, and an object of the present invention is to provide a novel pyrolysis incineration apparatus, which is constructed by integrating a combustion facility and a dust collection facility.

[13] Another object of the present invention is to provide a novel pyrolysis incineration apparatus, which is provided with a dust collection facility capable of collecting dust by using waste heat produced from the combustion of the waste.

[14] Still another object of the present invention is to provide a novel pyrolysis incineration method, in which decomposition gas and waste gas could be collected with water vapor produced by using waste heat, which was produced from the combustion of the waste. Technical Solution

[15] To achieve the above object, the present invention provides a stackable integral type pyrolysis incineration apparatus, which comprises: an incineration furnace for incinerating waste; a combustion furnace disposed under the incineration furnace for heating the incineration furnace; and a residual sludge tank disposed above the incineration furnace for producing water vapor with waste heat of the lower incineration furnace to collect gas produced from the incineration furnace to thereby form residual sludge.

[16] In the present invention, the residual sludge tank further has a condensation assistant agent contained therein.

[17] In the present invention, a well known condensation assistant agent may be used as the condensation assistant agent, and there is no special limitation thereto.

[18] In the present invention, the residual sludge tank is supplied with industrial citric acid soda, rice hulls ash, lees of raw rice wine, saw dust, foods garbage, or a mixture thereof so as to produce activated residual sludge.

[19] In the present invention, the residual sludge tank may be constructed of a multistage structure for collecting the discharged gas more completely.

[20] In the present invention, the incineration furnace is provided with stones or gravels at a bottom surface thereof so that heat can be easily transmitted to the inside of the waste combusted in the incineration furnace.

[21] In the present invention, the combustion furnace may be heated by electricity or flame. In the embodiment of the present invention, the combustion furnace may be a gas combustion device, which heats the bottom of the incineration furnace directly by flame. [22] In the present invention, the bottom surface of the incineration furnace can be made of material having a good thermal conductivity, preferably, iron, so that the heat from the combustion furnace can be easily transmitted to the incineration furnace.

[23] Also, the upper surface of the incineration furnace can be made of material having a good thermal conductivity, preferably, iron, so that the heat from the combustion furnace can be easily transmitted.

[24] Moreover, the bottom surface of the residual sludge tank may be made of material having a good thermal conductivity, preferably, iron, so that the heat from the lower combustion furnace can be easily transmitted to the residual sludge tank.

[25] In the present invention, a connection piping is provided between the incineration furnace and the residual sludge tank so that the gas produced from the incineration furnace can be introduced into the residual sludge tank.

[26] In one embodiment of the present invention, the connection piping may be a piping having a pipe shape connecting the side of the incineration furnace to the side of the residual sludge tank.

[27] In the present invention, the incineration furnace may be provided with an air inlet opening for supplying air into the waste heap. The air introduced through the air inlet opening oxidizes the waste and blows off ashes remaining after the decomposition, thereby defining the connection piping to the residual sludge tank.

[28] In another aspect, the present invention also provides a method of treating waste in a pyrolysis incineration manner, which comprises the steps of: heating the waste indirectly in an incineration furnace to thereby pyrolyze the waste; producing water vapor in a residual sludge tank by using heat produced from the incineration furnace; and collecting the waste gas produced from pyrolysis by using the water vapor.

[29] In the present invention, the pyrolysis is carried out by the contact of the waste with the heated incineration furnace. In the embodiment of the present invention, the pyrolysis may be carried out together with the air introduced from the outside, then ashes decomposed by the air and the heat are floated and introduced into the residual sludge tank.

[30] In the present invention, the step of producing the water vapor in the residual sludge tank is accomplished by heating the water by the heat transmitted from the incineration furnace, the heat being transmitted to the residual sludge through the bottom surface thereof, which is stacked on the lower incineration furnace and contacted with the upper portion of the incineration furnace, and heating and boiling the water in the residual sludge tank.

[31] In the present invention, the step of collecting waste gas by using the water vapor is carried out by the entrapment of the waste gas passing through the upper portion of the residual sludge tank with the water vapor, dropped into the water and collected. The water contains condensation assistant agent to produce activated sludge after collecting the waste gas, and the citric acid soda to neutralize the activated sludge.

Advantageous Effects

[32] Therefore, according to the present invention, there is provided a waste pyrolysis incineration apparatus, in which residual sludge can be obtained by effectively collecting the waste gas by using the water vapor, and it is possible to install the apparatus at a narrow place because it is embodied integrally, and the waste heat for use in the combustion can be effectively used thereby being devised to economize the energy.

[33] Also, according to the present invention, there is provided a method for manufacturing an activated residual sludge by mixing residual sludge with various wastes.

Brief Description of the Drawings

[34] Concrete features and advantages of the present invention will be made clearer by the below detailed description of the present invention in connection with the appending drawings, in which:

[35] FIG. 1 is a cross-sectional view of an integral type waste treating apparatus according to the present invention;

[36] FIG. 2 is a side view of the integral type waste treating apparatus according to the present invention;

[37] FIG. 3 is cross-sectional view of the integral type waste treating apparatus according to another embodiment of the present invention. Mode for the Invention

[38] Hereinafter, a stackable integral type pyrolysis apparatus according to one preferred embodiment of the present invention will be described in detail with reference to the appended drawings.

[39] As shown in FIGs. 2 and 3, at first, the stackable integral type pyrolysis incineration apparatus according to one preferred embodiment of the present invention, which can incinerate and collect dust in an integral apparatus, comprises: an incineration furnace 10 for incinerating waste; a combustion furnace 20 disposed under the incineration furnace 10 for heating the incineration furnace 10; and a residual sludge tank 30 disposed above the incineration furnace 10 for producing water vapor with waste heat of the lower incineration furnace 10 to collect gas produced from the incineration furnace 10 to thereby form residual sludge.

[40] In other words, the stackable integral type pyrolysis incineration apparatus is constructed of a combustion furnace 10, an incineration furnace 20, and a residual sludge tank 30 sequentially disposed to a cylindrical body 100, which is divided into three layers by means of partitions, and the apparatus is supported by a supporting member 51, which is movable by installing wheels 52 and can be fixed to the ground by installing a fixation device 53.

[41] Also, the combustion furnace 10 is provided with a gas combustion device 11 for heating the incineration furnace 20, and the gas combustion device 11 is constructed by disposing gas pipes 12 by a predetermined interval, which is provided with a plurality of gas ignition nozzles 13. The gas combustion device 11 is connected to an outer gas supply device (not shown) via a gas valve 14 connected to the lower end of the combustion furnace 10.

[42] Herein, an opening hole 15 is formed at a side wall of the combustion furnace 10 for observing the inside and igniting the gas nozzle 13. Especially, a ceiling of the combustion furnace 10, which is a bottom surface 28 of the incineration furnace 20, is constructed of an iron plate so that it can be easily heated by flame.

[43] In addition, the incineration furnace 20 is where the waste is thermal-decomposed and incinerated, in which gravels 21 are disposed at a portion of the bottom for supporting the waste 26, and a plurality of air nozzles 23 is installed at the upper end to inject air to the thermal-decomposed waste 26. Compressed air is supplied to the air nozzle 23 via an air valve 27 disposed at one side wall of the incineration furnace 20 thereby injecting the air to the waste.

[44] Herein, the incineration furnace 20 is provided at the side wall with at least one connection piping 27, for example, two connection pipings at the left and right sides, for connecting to the residual sludge tank 30. Gases produced during the pyrolysis of the waste 26, the compressed air injected from the air nozzle 23, and the waste dusts are discharged from the incineration furnace 20 through the connection piping 24 and entered into the residual sludge tank 30. The connection piping 24 is provided with a piping valve 25 so that it can be closed and opened, if required, and the connection piping 24 is connected to the outside at the side and then to the side wall of the residual sludge tank 30 so that it can be operated conveniently at the outside.

[45] Especially, the connection piping 24 is disposed at the upper end of the sidewall of the incineration furnace 20 so that it can use the ascending air flow formed by heating. Also, the connection piping 24 is connected through the sidewall to the upper end of the residual sludge tank 30 so that the water 36 filled in the residual sludge tank 30 cannot flow into the incineration furnace 20 by way of the connection piping 24.

[46] In addition, the residual sludge tank 30 is filled with water so that residual sludge can be formed by entrapping the combustion gas, air, waste dust, soot, and the like with water vapor, flowed into the residual sludge tank 30 through the connection piping 24. Herein, condensation assistant agent is supplied into the water 36 filled in the residual sludge tank 30 so that residual sludge can be formed by the collected air, the waste dust, the soot, and the combustion gas, and the like. [47] Herein, the condensation assistant agent is chemicals added to increase the condensation effect, and can be selected from a sodium carbonate, a limestone, a quicklime, slaked lime, a sodium hydroxide, an activated silica, an alginic acid soda, a CMC, and the like, which can be commercially used. In addition to the condensation assistant agent, industrial citric acid soda, or soda, and the like can be further added to maintain the neutralized pH.

[48] Especially, various materials such as rice hulls ash, lees of raw rice wine, saw dust, and foods can be added to produce activated residual sludge in addition to the condensation assistant agent, and pH adjustment agent.

[49] Moreover, the water vapor for entrapping the combustion gas, the air, the waste dust, the soot, and the like can be produced by the boiling of the water filled in the residual sludge tank 30. In particular, the water can be boiled by the heat transmitted to the bottom surface 38 of the residual sludge tank 30, which is the ceiling of the incineration furnace 20.

[50] Also, a water gauge 35 is provided at a side of the residual sludge tank 30 for observing the level of water at the inside of the residual sludge tank 30, a discharge opening 36 is provided at the upper surface, and a charging opening 37 is provided at the upper surface to complement water and additives.

[51] Glass holes 17 ' , 21 ', 31 are formed respectively at side walls of the combustion furnace 10, the incineration furnace 20, and the residual sludge tank 30, and temperature gauges have been fixed to monitor the inside temperature.

[52] Also, the stackable integral type pyrolysis incineration apparatus operates as follows.

[53] At first, gas is supplied by the opening of the gas valve 14, and the gas nozzle 11 is flamed thereby heating the bottom surface of the incineration furnace 20. When the bottom surface of the incineration furnace 20 is heated and the temperature of the incineration furnace 20 is raised, waste is supplied into the incineration furnace after opening the hole 28 formed at the side-wall thereof. In this instant, the waste is stacked on the gravels 21 arranged on a portion of the bottom of the incineration furnace or on the bottom surface, and then the opening hole 28 is closed and the waste is incinerated.

[54] The decomposition of the waste is almost carried out by the pyrolysis in principal.

Oxygen can be supplied after opening the air valve to increase the speed of the decomposition during the progression of the pyrolysis, and the air is supplied sufficiently so that it can arrive at a space formed between the gravels 21 and the inside of the stacked waste.

[55] During the progression of the incineration, when the water in the residual sludge tank is boiled by the sufficient heating of the ceiling (that is, bottom of the residual sludge tank) of the incineration furnace by means of the heat transmitted from the in- cineration furnace 20, the piping valve 25 disposed at the connection piping 24 is opened so that the decomposition gas can be discharged from the incineration furnace 20.

[56] The combustion gas introduced into the residual sludge tank 30 through the connection piping 24 is entrapped and condensed by the water vapor formed by the boiling of the water, and collected at the residual sludge tank, and the collected combustion gas, and the like is collected by the condensation assistant agent and the like supplied to the water thereby forming the residual sludge.

[57] It is constructed that only the water vapor and the air can be discharged through the discharge opening formed at the upper surface, after the waste combustion gas is entirely entrapped by the water vapor. Additional entrapping device can be provided at the discharge opening, and there is no special restriction.

[58] The present invention is not restricted to the above embodiment, and various modifications can be made by those skilled in the field of art without departing from the scope of the present invention.

[59] As shown in FIG. 5, the residual sludge tank can be constructed in two stages, and an additional connection piping for connecting a side of a lower residual sludge tank 60 and an upper residual sludge tank 70, so that harmful gases produced from the incineration furnace can be entrapped more completely. In addition, when the upper residual sludge tank 70 cannot be heated to the temperature enough to boil the water, additional heat emitting device can be provided to boil the water.

Industrial Applicability

[60] Accordingly, the scope of the invention which is sought to be protected by the present invention will be determined based on the claims described below and the technical idea thereof and not restricted within the scope of the detailed description of the present invention.

Claims

[1] A stackable type integral pyrolysis incineration apparatus comprising: an incineration furnace for incinerating waste; a combustion furnace for heating the incineration furnace; and a residual sludge tank disposed above the incineration furnace for producing water vapor with waste heat of the lower incineration furnace to collect gas produced from the incineration furnace to thereby form residual sludge.

[2] The pyrolysis incineration apparatus according to claim 1, wherein the residual sludge tank further has a condensation assistant agent contained therein.

[3] The pyrolysis incineration apparatus according to claim 1, wherein the residual sludge tank is supplied with industrial citric acid soda, rice hulls ash, lees of raw rice wine, saw dust, foods garbage, or a mixture thereof, to produce activated residual sludge.

[4] The pyrolysis incineration apparatus according to claim 1, wherein the residual sludge tank is constructed of two stages.

[5] The pyrolysis incineration apparatus according to claim 1, wherein the incineration furnace is provided with stones or gravels at a bottom surface thereof.

[6] The pyrolysis incineration apparatus according to claim 1, further comprising a connection piping installed between the upper ends of a side wall of the incineration furnace and a side wall of the residual sludge tank.

[7] The pyrolysis incineration apparatus according to claim 1, further comprising an air injection device installed at the upper end of the incineration furnace.

[8] A method of treating waste comprising the steps of: heating the waste indirectly in an incineration furnace to thereby pyrolyze the waste; producing water vapor in a residual sludge tank by using heat produced from the incineration furnace; and collecting waste gas produced during the pyrolysis by using the water vapor.

[9] The method of treating waste according to claim 8, wherein the residual sludge tank has a condensation assistant agent contained therein.