KR100400613B1 - Burning up treatment method of sludge from waste water which making fuel - Google Patents

Abstract

The present invention relates to a fuel incineration treatment method of wastewater sludge, and in particular, after passing various kinds of sewage sludge discharged from sewage treatment plants and waterworks through a mixing dryer equipped with a screw to be mixed with a heating plate oil, the sludge and the sludge again through a centrifuge. The purpose is to separate the oil and transfer it to the primary combustion chamber and the secondary combustion device to completely incinerate. To achieve the above purpose, the screw-formed mixing dryer and the waste heat boiler are connected in a line to heat the fruit of the mixing dryer. Waste oil or bunker filled inside and circulated by circulating the oil is maintained at a high temperature, and the sludge and oil mixed in the screw are mixed, and the oil and sludge are separated again by a centrifuge and the combustion device Time and fuel cost of incineration completely by incineration It is capable of increasing savings.

Description

Burning up treatment method of sludge from waste water which making fuel}

The present invention relates to a wastewater sludge incineration method, and in particular, the various kinds of sewage sludge discharged from the sewage treatment plant and the water supply plant are introduced into the mixing dryer with a screw, and the oil and sludge heated inside the mixing dryer are integrally mixed. The present invention relates to a wastewater sludge incineration treatment method configured to safely remove moisture contained in sludge and to separate oil-containing sludge and oil through a centrifugal separator, and to inject it into an incineration combustion chamber for complete incineration.

Generally, wastewater sludge contains about 85% of water, and to remove it, it is physically dehydrated and landfilled or incinerated.

And most of the wastes generated from sewage treatment plants and waterworks are dumped in the ocean, causing marine pollution.

There is a large amount of waste as described above, but there is a structural problem that the incineration method is not appropriate.

Therefore, in order to solve the problem of such organic waste, it is necessary to consider a way to make it resource or recycle.

At this time, the organic wastes available for circulation include manure, livestock manure, septic tank sludge and sewage sludge.

The sludge has a very high moisture content and is physically dehydrated with landfill to remove it, which is landfilled or incinerated. This is due to the high water content (85%) of the dehydrator. There was a problem of excessive cost.

In the conventional sludge incineration system, the sludge dried through the mixing dryer is incinerated in the incinerator, and the high temperature of about 900 ° C. generated in the incineration in the incinerator is introduced into the waste heat boiler to generate steam, and then around 300 ° C. In addition to the gas entering the air preheater, the inlet is incinerated efficiently by preheating the air introduced from the outside by the blower to the incinerator, and the steam generated from the waste heat recovery boiler is sent to the mixing dryer. This allows steam to be recycled to save on fuel.

In addition, the harmful gas from the waste heat recovery boiler is absorbed and discharged through the reactor by the neutralizing material, this time is treated with SO _X , HCL, HF, dioxin and the like.

However, the conventional sludge incineration method as described above is difficult to dry the sludge due to the difficulty of heating more than 170 ℃ at 7kg / cm ² due to the nature of the steam (typically 40 to 60% water content), and also prevents the back end due to excessive adhesion of moisture It has the disadvantage of preventing condensation of facilities and low temperature corrosion due to SO _X and it is a main cause of white smoke of stacks.

Prior art related to this is Patent Registration Application No. 1998-24529, "Sewage Sludge Incineration Method," which not only maximizes the energy efficiency of various sewage sludges but also minimizes the generation of waste water to solve the causes of pollution. It is intended to be used as a part of the integrated waste management system. Sewage sludge and primary dry sludge are introduced into the mixer, mixed with each other at a predetermined rate, dried by high temperature heat, and dried by spraying through the cyclone and the transfer means. By the feeder and the crusher to be below a certain value, a part of the amount of the crushed mixture to be stored in the bin, the sludge stored through the fuel injector to be used as a heat source of the incinerator, and also to lower the temperature of the incinerator Supplying the discharge steam of the mixer dryer to the discharge duct of the incinerator, After the ash is collected in the ash cyclone, the superheated steam is put into the mixing dryer, and the collected ash is stored in the ash bin, and the air discharged from the cyclone is filtered through a bag filter, and the internal pressure of each blower and the incinerator is Used for balance, and part of the vapor evaporated in the mixer is for controlling the incinerator exhaust temperature, the remainder is condensed in the vapor condenser through a duct scrubber, the non-condensable gas is fed to the incinerator through a condenser exhaust fan The waste heat from the incinerator was mixed with air at room temperature supplied from the air filter, and after filtration in the bag filter, the ash was stored in the ash bin and the filtered air was discharged from the stack. The above method requires complicated equipments, which leads to complicated equipments and increases the investment cost of the equipments. Has a problem.

The present invention has been made in order to solve the above problems, by mixing various sewage sludge discharged from the sewage terminal treatment plant and waterworks with the oil heated to about 200 ° to evaporate the water in the difference between the boiling point of the oil and water, the oil It is an object of the present invention to provide a wastewater sludge incineration method configured to discharge the sludge contained in the screw by separating the oil and sludge through a centrifugal separator, and to incinerate the sludge into a combustion chamber.

In order to achieve the above object, the screw-formed mixing dryer and waste heat boiler are connected in a line to transfer and circulate high-temperature fruit to the outer jacket of the mixing dryer to maintain waste oil or various oils filled therein at a high temperature (200 ° C). And means for mixing the sludge introduced into the screw with oil, and the sludge mixed with the oil by the screw is introduced into the combustion chamber of the incinerator while being separated into oil and sludge again by a centrifugal separator, and the mixed dryer. It is to provide a means for removing the moisture and odor generated from the sludge by connecting a vacuum pump and a condenser.

1 is an overall configuration diagram showing a fuel incineration treatment method of wastewater sludge of the present invention Figure 2 is a partial cross-sectional view schematically showing the gist of the present invention

Explanation of symbols on the main parts of the drawings

10. Incinerator primary combustion chamber 11. Incinerator secondary combustion chamber

12. Waste heat boiler 13. Mixing dryer

14. Screw 15. Cooling tower

16. Centrifuge 17. Air preheater

18. Primary dust collector 19. Chemical tank

20. Rotary valve 21. Manned blower

22. Semi-dry scrubbing tower 23. Bag filter

24. Condensate oil and water separation tank 25. Vacuum pump

26.Condenser 27.Outer Jacket 28. Oil 29.Fruit oil 30. Fruit oil outlet 31.Fruit oil outlet 32. Conveyor 33. Drive Motor 34. Sludge Inlet 35. Sludge Outlet

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration made by the embodiment of the present invention.

1 is an overall configuration diagram showing a wastewater sludge incineration apparatus of the present invention, wherein the mixing dryer 13, the sludge supply means 20, the blower 21, the primary and secondary combustion chambers 10, 11 and a vacuum are shown. The pump 25, the dust collector 22, and the centrifuge 16 are shown.

The fruit oil 29 contained in the outer jacket 27 formed on the outer side of the mixing dryer 13 is continuously heated by the high temperature heat recovered from the waste heat boiler 12 and stored inside the mixing dryer 13. In this case, the screw 14 formed in the mixing dryer 13 rotates by the rotation of the driving motor 33 to sufficiently mix the introduced sludge and the heated oil. In addition, it is configured to be separated back into oil-containing sludge and pure oil by moving it to the centrifuge 16. At this time, the initial heat source uses heat by burning an auxiliary burner (not shown) or general waste. In normal operation, the dried sludge discharged from the process is combusted to maintain the fruit oil (29) at about 200 ° C. through the waste heat boiler (12) and to dry with a forced circulation pump. Circulating into the outer jacket 27 of the 27 is configured to maintain the temperature continuously.

Meanwhile, the vacuum pump 25 extracts water vapor of the sludge generated by the high temperature inside the mixing dryer 13, recovers water vapor through the condenser 26, and the non-condensed rare organic compounds are sent to the incinerator to be completely incinerated. will be.

Since the centrifugal separator 16 can separate liquids having different specific gravity by the action of centrifugal force, 90% or more of oil contained in the surface of the sludge supplied from the screw 14 is removed, and the oil collected therein is stored and Into the mixing dryer 13 to be recycled. At this time, the oil pressure inside the dryer 13 is not generated separately and the temperature is maintained at 200 ° C. It is preferable to use the vacuum pump 25 to maintain the internal pressure of the dryer 13 at about -50 to -100 ^mm Aq.

The surface of the sludge generated in the process is introduced into the combustion chamber 10 with a small amount of oil. In such a situation, the ratio of oil and sludge is reasonable to mix in the ratio of oil (5) to sludge (1). The oil has a boiling point of 258 ° C. and water has a boiling point of 100 ° C. so that the oil temperature is higher than the boiling point of the water and lower than the boiling point of the oil so that only water evaporates.

In this case, the initial operation of the combustion chamber is operated by using a diesel burner connected to a diesel storage tank (not shown), and a diesel burner (not shown) is also used as an energy balance for maintaining the temperature of the incinerator 10.

Therefore, the oil-containing sludge may be used as a sludge fueled by being injected into the combustion chamber 10 by a screw conveyor or a general conveyor.

In addition, the harmful gas generated in the combustion chamber 10 is introduced into the secondary combustion chamber 11 again, and the gas is reburned by the operation of the diesel oil burner.

Waste heat generated in the secondary combustion chamber 11 is re-introduced into the mixing dryer 13 by the fruit boiler 12 to generate drying heat.

The high temperature generated in the waste heat boiler 12 is maintained at an appropriate temperature (about 200 ° C.) in the mixing dryer 13 to vaporize the water contained in the sludge with a boiling point difference to be introduced into the separator by a vacuum pump. At this time, the specific gravity of the oil is 0.85 to 0.9 and the sludge specific gravity is 1. 02. The sludge passed through the centrifuge 16 is kept at an average of 2 to 5% of water and 5 to 10% of oil. The calorific value is maintained at about 4,000 ~ 5,000kcal / Hr, and complete combustion is performed in the primary and secondary combustion chambers on their own without any heat in the furnace.

Referring to the operation of the present invention as described above in detail.

First, when the sludge containing a large amount of water is introduced into the mixing dryer 13, the sludge is contained in the sludge due to the difference in boiling point (moisture 100 ℃, oil 250 ℃ or more) of the heated oil and water in the mixing dryer. At this time, the water is rapidly evaporated. At this time, the sludge is introduced into the heated oil and the submerged submerged water is transferred to the condenser 26 by the vacuum pump 25 to recover the moisture, and the non-condensed odorous substances are incinerator. It is sent to the primary combustion chamber 10 to remove the odor through a high temperature combustion method.

In the above situation, the vapor evaporated through the mixing dryer 13 passes through the condenser 26 by the vacuum pump 25, and the condensed water is discharged or recovered through the oil / water separation tank 24 and is not condensed. Spontaneous organic compounds can be burned completely through incinerators.

As described above, the evaporation of water in the mixing dryer 13 is completed, and the screw 14 assembled in the mixing dryer 13 is rotated, and oil and sludge already filled in a predetermined amount in the mixing dryer 13 naturally. Are mixed and transferred to the centrifuge (16) by screw (14).

When the oil and sludge are separated from the centrifuge 16 and the sludge is introduced into the inlet of the primary incinerator 10, the oil-containing sludge can be completely combusted at a high temperature and in a dry state in the incinerator 10. Due to the high calorific value, the use of auxiliary fuel is reduced and the incinerator structure is simplified when burning low calorific value household waste.

Of course, the sludge simply serves as fuel.

In addition, most gaseous contaminants generated when treating sewage sludge have an odor or color, mainly due to organic compounds.

Since these organic compounds are mostly flammable, they can be removed or stabilized in the incineration apparatus of the present invention.

Thermochemical conversion of pollutants is achieved by oxidation of organic pollutants in the temperature range of 425 to 650 ° C.

Thermal incinerators can be used for the incineration of almost all gaseous pollutants and can be used relatively simply for the elimination of odor or toxic gases and the complete removal of visible gaseous organic pollutants.

Therefore, in order to minimize the amount of energy used for incineration, oil can be included in the dried sludge to make the incineration rate faster, which can greatly reduce the time required for the operation and the amount of fuel consumed for incineration. There is a big advantage.

And the kind of oil contained in the dried sludge is not limited to waste oil and various oils.

The present invention described above is limited to the above-described embodiment and the accompanying drawings, as a person skilled in the art to which the present invention pertains can be substituted and modified in various forms without departing from the technical spirit of the present invention. It doesn't happen.

As described above, the present invention raises the oil stored in the mixing dryer to a high temperature of 200 ° C., and separates the oil and the sludge in a state where the water of the sludge introduced by the high temperature is removed by boiling point, and then a small amount of oil is contained. Incineration of sludge has the advantage of greatly reducing the time and fuel cost of incineration, and also minimizes the incineration process caused by sludge volume reduction, weight reduction, and heat generation, thereby reducing the size and production cost of the incinerator. It has the effect, and the effect of easy operation and maintenance.

Claims (1)

In the wastewater sludge fuelized incineration treatment method which can move wastewater sludge to an incinerator and burn it by a combustion chamber, A high temperature of the waste heat boiler connected to the combustion chamber is configured to heat the fruit oil supplied to the outer jacket of the mixing dryer in which the screw is formed to heat the oil stored in the mixing dryer to 200 ° C; Means for evaporating water at a boiling point by mixing water-containing sludge and hot oil by the screw while maintaining the oil filled in the mixer at a high temperature of 200 ° C .; The sludge mixed with oil by the screw is separated again through a centrifugal separator, and the condenser recovers the generated water vapor and injects the non-condensed lean organic compound into the combustion chamber for complete combustion; The waste water sludge fueled incineration treatment method, characterized in that configured to remove the moisture and odor generated from the sludge by connecting a vacuum pump to the mixing dryer.