JPS5836700A - Drying, deodorizing and incinerating device for waste such as sludge containing organic material or the like - Google Patents

Abstract

PURPOSE:To incinerate and deodorize waste such as sludge contg. org. material which is dehydrated to <=65% water content by drying said waste by hot wind and incinerating and deodorizing the malodors produced in said process together with the dry sludge. CONSTITUTION:Waste such as sludge contg. org. material which is dehydrated to <=65% water content is introduced into a milling type dryer, and is dried with the hot wind heated to >=400 deg.C by a heat exchanger using the energy of the waste incineration gas generated in the stage of incinerating said waste finally in a fluidized bed type incinerator. The malodorous dry waste gas (about 120 deg.C) produced in said drying stage is heat exchanged with the waste incineration gas of the fluidized bed type incinerator, whereby the gas is heated to >=300 deg.C. Such gas is blown into the fluidized bed type incinerator where the gas is incinerated together with the dry sludge fed into the fluidized bed type incinerator from the milling type dryer, whereby the waste is incinerated and deodorized simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a powerful dewatering device such as a roll press or a filter press to reduce the moisture content of sludge waste to 65% or less, using low calorific value organic matter-containing sludge waste.

The present invention relates to a treatment method in which the dehydrated product is vaporized and dried to the limit of natural combustion, and then completely incinerated and deodorized at the same time.

As is well known, in the treatment of sewage wastewater by the "activated sludge method", when activated sludge is treated by the "methane fermentation method", digested sludge is produced as a residue.

This residue is formed from organic and inorganic substances and is simply called sludge.

An increase in the amount of treated sewage, human waste, industrial wastewater, etc. naturally accompanies an increase in the amount of sludge, and the treatment and disposal of this sludge has become a very difficult and important problem. Conventionally, sludge has been used for landfill, and after dehydration and drying, it has been partially used for soil improvement and fertilizer in agricultural land, but due to the increased amount of sludge generated, the nature of the sludge itself, and geographical circumstances, it is not always possible to use the appropriate method. I can't say that. It is desirable to convert it easily, safely, economically and hygienically into a harmless end product.

In addition to the above-mentioned treatments, activated sludge can be reduced by anaerobic treatment (gasification and liquefaction), and digested sludge can be dehydrated and dried to make fertilizer, or it can be burned. Many studies have been conducted on the treatment of sludge combustion after evaporation of activated sludge by using activated carbon, pulverized coal, or other combustible auxiliaries.

The basic methods of conventional sludge treatment include concentration (pretreatment for dehydration), dewatering (various vacuum filtration machines, pressurized p-filtration machines, centrifugal separators, etc.), solar drying (on a sand bed), heat treatment, wet combustion,
There are various methods such as combustion (various types of combustion, incinerators), etc. When considering secondary and tertiary pollution, incineration treatment is considered to be a preferable method, although it is expensive.

The present invention dehydrates waste such as organic-containing sludge with a low calorific value using a powerful dehydrator to reduce the water content of the sludge to 65% or less, and then dries the sludge with hot air, and completely incinerates the bad odor generated in this process together with the dried sludge. To provide a method for deodorizing efficiently and inexpensively. It is something.

In order to dry the dehydrated sludge to a predetermined moisture content, it is common to use hot air drying using combustion exhaust gas when incinerating the dried sludge, but it is extremely difficult to treat the odor of the dried exhaust gas. Moreover, due to the high cost, many odor countermeasures are inadequate.In order to dry the dewatered sludge, the combustion waste generated when incinerating the dried sludge is converted into room-temperature air through heat exchange using the waste heat energy of the sludge. 409°C
The sludge is heated to the above temperature and blown as hot air for fluidization in a fluidized bed type or milling dryer, making direct contact with the sludge, vaporizing the water content of this sludge to a predetermined water content (natural combustion limit), and generating gas in this process. Dry exhaust with bad odor (]200c)
It is heated again to over 300°C by heat exchange using the residual waste heat energy of the combustion exhaust gas, and then blown into the fluidized bed incinerator to produce hot air for fluidization or combustion, and completely incinerate and deodorize together with the dry sludge. The key point of the invention is that processing can be performed simultaneously.

The present invention will be explained based on examples and using diagrams.

This was demonstrated using sludge discharged from the wastewater treatment equipment of a used paper recycling plant.

The method of the present invention will be explained below with reference to the drawings. The figure is an explanatory diagram showing the outline of the method of the present invention.

First, low calorific value organic matter-containing sludge or other waste a is dehydrated to a water content of 65% or less using a powerful dehydrator (not shown), and the waste is transported and stored in a storage tank. Further, by providing a discharging device 2 at the bottom, a quantitative dispensing device 3 at the discharging port, and a raking device 4 at the top, stable quantitative discharging of the stored sludge is achieved. The discharged sludge is temporarily stored in a sludge adjustment tank 6 by a conveyor 5. The sludge is charged into a fluidized bed milling drying apparatus 8 by a quantitative feeder 7 connected to the lower part of the sludge conditioning tank 6. A milling feeder 9 installed at the bottom of this drying device 8 efficiently mixes activated sludge with hot air (400'O or higher) blown up through an orifice nozzle 10 installed at the bottom to form a fluidized bed and vaporize a predetermined amount of moisture. Evaporate and dry.

This dried sludge is sequentially transferred from the outlet 11 of the drying device 8 via the rotary pulp 12 to the dried sludge conveyor 13.
is loaded into the In addition, an exhaust port 14 provided at the top of the drying device 8
The mechanical dust collector (cyclone) connected to
The dried sludge is charged to a 1:3 dry sludge transport conveyor via a rotary valve 16 provided at the bottom of the dust collector, and merges with the dried sludge from the dry sludge transport outlet. This material is temporarily stored in a dry sludge conditioning tank 17, and charged into the fluidized bed incinerator +9 via a quantitative feeder 18 connected to the lower part of this conditioning tank 17.

The bottom of the incinerator 19 is filled with silica sand, a fluidized bed is formed with hot air (300° C. or higher) blown up from an orifice provided at the bottom, and burner B instantly and completely burns the sand. Incinerator] 9 Combustion gas outlet 21 provided at the top
The exhaust gas containing most of the combustion ash is led to a mechanical dust collector (cyclone) 22 connected to the cyclone, where it is separated by vortex flow, and the separated combustion ash is passed through a rotary valve installed at the bottom of the cyclone 22. The ash is transported out of the facility by the combustion ash transport device 24. The combustion exhaust gas (device 950°C) separated from the combustion ash is introduced into the heat exchange air preheater section of the drying device 8 for generating fluidized hot air (4oo0C or higher), and room temperature air (g) is forced through the blower 26 to generate heat. The combustion exhaust gas is led to the exchange preheater 5, and the heat exchanger uses the thermal energy of the combustion exhaust gas to generate 400 yen.
It is converted into hot air at a temperature of .degree. C. or higher, is introduced into the wind box of the drying device, and is blown up from the orifice nozzle 10 as flowing hot air to dry the dehydrated sludge a.

The temperature of the combustion gas at the outlet of the heat exchange preheater 5 is lowered to about 65,000, and the combustion gas is introduced into the heat exchange preheater 27 with dry exhaust for generating fluidized and combustion hot air (300°C or more) in the fluidized bed incinerator 19. Ru. Mechanical dust collector (cyclone)
The foul-smelling dry exhaust from the exhaust port 15 is guided to the preheater n, where it is heated to 3000C or higher through heat exchange using the residual waste heat energy of the combustion exhaust gas, and then a part of it is forced through the blower and sent to the incinerator 19. It can be introduced into a wind box and used as hot air for fluidization, and some of the hot air can be used for combustion via a forced air blower, making it possible to completely incinerate and deodorize.

The combustion exhaust gas temperature at the outlet of heat exchanger r due to exhaust gas is approximately 48
The temperature is lowered to 0°C, the waste heat is introduced into the boiler, and the supplied water C is heat exchanged to generate steam d to recover heat. 7]? The combustion exhaust gas that has passed through the filter 30 is guided by the induced blower 31 and introduced into the smoke washing tower 32, and the soot and dust in the exhaust gas that may cause secondary pollution are sprayed, washed, and absorbed by the water supply θ. The waste water f is sent to a waste water treatment facility (not shown) and treated. Note that the exhaust gas passes through the smoke washing tower 32 or is released into the atmosphere from the exhaust pipe 33.

As mentioned above, the method of drying, deodorizing and incinerating wastes such as organic matter-containing sludge of the present invention is extremely efficient and reduces ordinary expenses, while labor costs are also significantly reduced compared to conventional treatment methods. It is extremely excellent in that it can be used.

[Brief explanation of the drawing]

The figure is an explanatory diagram of a method for drying, deodorizing, and incinerating waste such as low-temperature rat sludge containing rocky material according to the present invention. ■・・・Storage tank 2・′・・・Export device 3
・・Quantity dispensing device 4・・Roughing device 5・・Transport conveyor 6・
...Sludge adjustment tank 7 ...Quantitative feeder 8
... Fluidized bed milling dryer 9 ... Milling feeder 10 ... Orifice nozzle 11 ... Output port 12 ... Rop IJ-valve 13 ...
...Conveyor 14...Exhaust port 15...
... Mechanical dust collector (cyclone) 16 ... Rotary valve 17 ... Dry sludge adjustment tank 18 ... Quantitative feeder -19 ... Fluidized bed incinerator processing ...・Mi Orifice nozzle 21... Combustion gas outlet n... Mechanical dust collector (cyclone) B...
...Rotary valve 4...Combustion ash transfer device Uta...Heat exchange preheater section...Forced air blower n...Dry exhaust heat exchange preheater A, 4... ... Forced blower 30 ... Waste heat boiler 31 ... Induced blower 32 ...
・Smoke wash tower a...Exhaust stack B...Burner a...Dehydrated sludge b...Combustion ash C...Water supply d...Steam θ
...Water supply f...Drainage g...
Room Temperature Air Patent Applicant Yoshio Gomi Procedural Amendment (Method) (Patent Office Examiner) 1. Indication of the case Patent Application No. 133823, filed in 1982. 2. Title of the invention □ Disposal of sludge, etc. containing organic matter.) Drying, odor, and incineration equipment 3 Relationship with the case of the person making the amendment Applicant name: Yoshi Gomi, male 4, agent address: 1-1-5 Minami-Aoyama-chome, Minato-ku, Tokyo Date of amendment order () Page 5 of the specification is corrected as shown in the attached sheet.

Claims (1)

[Claims] Waste such as low calorific value organic-containing sludge, which has been dehydrated to a moisture content of 65% or less, is sent to a fluidized bed dryer and is finally incinerated, using the waste heat energy of the incineration exhaust gas to exchange heat. Room temperature air is heated to over 4000C and blown into a fluidized bed milling dryer to evaporate and dry the moisture content up to the limit of natural combustion. Processing of waste such as organic-containing sludge, which is heated to 300°C or higher by heat exchange using combustion gas from an incinerator, and then blown into the incinerator to simultaneously perform complete incineration and deodorization along with dried sludge. Method.