JPS60101415A - Deodorizing method of sludge combustion exhaust gas - Google Patents

Abstract

PURPOSE:To eliminate the need for auxiliary fuel and to remarkably save energy, by a method wherein sludge combustion exhaust gas is deodorized as high quatity of heat waste is incinerated by a parallel flow type rotary kiln. CONSTITUTION:Sludge is charged in a countercurrent type rotary kiln 2 through a charging port 1, and combustion exhaust gas is introduced in a parallel flow type rotary kiln 14 through a multicyclone 7. Said exhaust gas is incinerated by means of the combustion heat of waste oil being high quantity of heat waste, and an offensive smell in the gas is burnt. The quantity of heat of the waste oil is 3,000-5,000kcal/kg, temperature at the central part of a furnace is increased to about 1,000 deg.C, and offensive smell concentration in the combustion exhaust gas is decreased to less than 1,000. In the parallel flow type rotary kiln 14, an amount of waste injected is controlled so that the temperature of deodorized exhaust gas is maintained at about 700 deg.C. This treatment eliminates the need for fuel such as heavy oil A.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for deodorizing exhaust gas generated when sludge generated in the treatment process of industrial 111 water is burned.

[Prior art]

Incineration in rotary kilns, vertical multistage furnaces, stoker furnaces, etc. has traditionally been used as a method for treating wastewater sludge, but since the sludge itself contains a large amount of water and has a low calorific value, The density is low and the odor cannot be filtered out by combustion.

For example, in the case of a rotary kiln, the counterflow type is used, but even if the burner hood at the outlet of the furnace where air enters is 600°C and the central part is 800°C, the temperature of the exhaust gas coming out of the furnace is about 30°C.
Since the temperature drops to 0°C, the odor concentration remains high and is emitted. In a co-current rotary kiln, the temperature is 600 to 700°C near the furnace near the burner, but the temperature decreases toward the outlet, so the sludge is not completely incinerated. Therefore, a parallel flow rotary kiln is not adopted.

For this reason, in order to prevent pollution, a deodorizing furnace is installed separately from the incinerator, and the combustion gas from the incinerator is further deodorized. Normally, deodorizing furnaces are lli combustion type, which burns odors at 600 to 700 degrees Celsius using fuel such as heavy oil as a combustion aid, but this is not a very effective means from an energy saving perspective as it uses a large amount of fuel. .

[Purpose of the invention]

In view of the above problems, the present invention aims to provide a method for deodorizing sludge combustion exhaust gas that consumes less energy.

[Structure of the invention]

The present inventors have developed an existing industrial waste incineration facility that utilizes the combustion heat of a parallel flow rotary kiln, which is used for input materials with a large calorific value, to generate wastewater sludge retention air. The combustion gas of the combustible material is guided into the parallel flow type rotary kiln, and the odor in the gas is high! It is intended to be incinerated together with a certain amount of waste.

In automobile factories and the like, large amounts of waste oil, paint slag, waste plastics, etc. are generated, and rotary kilns are used to incinerate these wastes.

Because of the high calorific value of the waste Ilg C described in 1., the temperature at the center of the furnace reaches approximately 1000°C, which not only completely incinerates the input material, but also causes the odor in the exhaust to reach a temperature so high that it cannot be detected by the sense of smell. will be removed. However, since the moisture content of the input material is low, the temperature at the inlet of the furnace is
If a recirculation rotary kiln is used, high-temperature gas of about 800°C will flow into the duct from the furnace and burn in the odor duct. On the other hand, in the case of a 1p flow type rotary kiln, the odor gas burns out in the kiln, so there is a risk of combustion in the duct.
There is an increasing number of people with high passion for incinerating waste vehicles. The present invention utilizes such characteristics for deodorizing sludge combustion I gas, and will be described below with reference to FIG. 11u of Example 4.

〔Example〕

Figure 1 shows an example of the conventional sludge incineration and initial gas removal process.

The sludge stored in a bunker (not shown) is transported by a screw conveyor and a belt conveyor (also not shown), and is fed from an inlet 1 to a countercurrent rotary kiln 2.
will be put into the 3 is the fuel inlet, 4 is the combustion air intake hole 7
The interior of the J comb and rotary kiln z is maintained at negative pressure by an air induction fan 5. 6 is the incineration ash outlet meeting 71<L,
, l'j mud and exhaust gas sound similar to each other. The sludge at the time of input has a moisture content of 60 to 85 parts, a solid content of 15 to 40 parts, and a calorific value of 1000 to 6000 kcal.
It is about 1 kg sl. Due to this large amount of moisture, the temperature at the center of the furnace is about 600℃, but the exhaust gas anchor fii drops to 300℃.The combustion exhaust gas enters the deodorizing furnace 8 through the multi-cyclone 7 (L'' , fuel such as heavy oil is added from fuel population 9 to 700C by 1α tangential combustion method.
deodorized. In this way, the population of deodorizing furnace 8 is 50,
More than 000 energy g (lJt is 1000u at the exit, -
It becomes F.

After that, the removed gas is cooled down to 3,000 yen in the cooling tower 10, and 1 tllll of dust is collected in the east air dust collection area 11 and released into the atmosphere from the chimney 12. Furthermore, 13i,
I beat the general attraction fan.

21>U is sludge combustion that incorporates the deodorizing method described in this book 6.
- An example of the process is shown in which a parallel flow rotary kiln 14 is installed in place of the deodorizing furnace 8 in Fig. 1, and high-temperature waste is input 01.
Waste oil is introduced from step 5, and the odor in the combustion exhaust gas of the sludge incinerated in the recirculation rotary kiln 2 is burned. The calorific value of waste oil is 3,000 to 5,000 kcal/Kq, and the gradient of 1.4] IcJf<5 is rJ1
000℃ and combustion↑, the concentration of air drops to below 111,000.

Parallel flow type rotary kiln 14 rJ: Inside the octopus
9 efforts were made. Ding, that is, the fall of fruit - 11, 11
- gas vXJXl political power 1 so that it is about 5700℃
'lCA (Ogiho finger 7J" fit prisoner's meeting 11th 7th pull)
Dej sleepover Kawagiri h ¥ tttli extension [2, shortened t+I
PiUA installed at exit 1111 of the rotor IJ kill 4
(LE] j] 7F l'j section ext.\I',) to apply negative pressure (by adjusting the rotation speed of the fan 13 of the fan 13) fl- I'm looking forward to it.

3 stop flow 2〇 - 1 Tarikirunt came out jl・2芙4J1ノjsu", then (f rice process and circulation 1 (1,
'+14 Isoshu 1υ) (to 511, chimney 12 (i-mochi into the atmosphere h (out neo I;,). Noit < 11.1 The H chain component in the gas is 5 (JX200 [) I) Ill y F
%NNOx100pp and above, I can't sense it in my sense of smell. In addition, parallel flow type rotary kiln 4 or modification (i4 'fj, -C
Shuichiichi 1 A] Conventional deodorizing furnace 8 liters
It is set so that the combustion engine is bypassed.

〔Effect of the invention〕

As described in 1, the present invention enables deodorization of sludge combustion exhaust gas while incinerating high calorific waste in a co-current rotary kiln, which eliminates the need for fuel such as heavy oil used in conventional deodorization furnaces, resulting in energy savings. Great effect.

The present invention is useful as a countermeasure against air gas because it can be implemented in combination with a wide range of incinerators, such as countercurrent rotary kilns, multi-stage furnaces, and stoker furnaces as well as incinerators for treating sludge.

[Brief explanation of drawings]

Figure 1 shows a process diagram from conventional incineration to seven gas deodorization, and Figure 2 shows a process diagram of an embodiment of the present invention. In the diagram, 1... Input port 2... Self-flow rotary kiln 3...
・Fuel population 4... Combustion bond air inlet 5... Air induction fan 6 River incineration ash output lower... Multi cyclone 8
・・・Toonai furnace 9...Fuel population 1o...Cooling tower 11...Electrostatic precipitator 12...Chimney 13...Comprehensive drawing fan 14...Parallel current rotary kiln 15...
・Input port patent applicant Toyota Motor Corporation

Claims (1)

[Claims] 1. A method for deodorizing sludge combustion exhaust gas, which comprises introducing the combustion exhaust gas of a combustible material that generates an odor, such as drainage sludge, into a parallel flow type rotary kiln, and burning the odor in the exhaust gas together with the cylinder calorific waste.