JPS5944513A - Nitrogen oxide suppressing operation of incinerator - Google Patents

Abstract

PURPOSE:To suppress the generation of nitrogen oxides by a method wherein the exhaust gas, which is discharged from the incinerator and cooled, is circulated and fed at positions higher than fire grates within the incinerator. CONSTITUTION:In nitrogen oxides suppressing operation, primary combustion air fed from the undersides of the fire grates 2 is throttled as few as possible in order to accelerate the gasification of the refuses onto the fire grates 2 and consequently suppress the generation of nitrogen oxides. In addition, a part of the exhaust gas cooled and dust-collected in blown into the incinerator 1 through exhaust gas blowing-in nozzles 3 by means of an exhaust gas circulating ventilator 10 in order to enable to accomplish slow and complete combustion under low oxygen concentration due to the effect of the direct cooling of combustion flame, mixing and stirring of combustion gas, resulting in enabling to control the exhaust gas temperature in a predetermined range and to effectively suppress the generation of nitrogen oxide.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for incinerating nitrogen oxides.

In a conventional incinerator, °C is ill
In order to adjust the air gas ffa1 to within 111u of F9i, ↓jU of the combustion air or cooling air introduced from the bottom of the grate is i, 'a jffil.
However, there was a problem in that the oxygen concentration in the exhaust gas increased due to the excessive supply of air, and a large amount of nitrogen oxides were generated.

Therefore, we decided to operate the municipal waste incinerator using C1 combustion.
A method has been proposed in which the cooled exhaust gas is mixed into the air and fed from the bottom of the grate, but this method is not effective in suppressing the generation of nitrogen oxides. Although there is A (% edible component (Hc l ) in exhaust gas.

:)Ox) caused the problem that the human lattice, etc. would be damaged.

The present invention solves the above-mentioned conventional problems, and C) allows the lid gas temperature at the furnace outlet to be adjusted to within a predetermined 11% range, and also achieves a nitrogen oxide suppression effect of 4". However, it is an object of the present invention to obtain a method of operating an incinerator that suppresses nitrogen acids and compounds without the risk of corroding or damaging the flames, etc.

In order to achieve the purpose described above, the nitrogen L11Σ oxide suppression operation method of the ji17i incinerator of the present invention is to transfer the cooled gas discharged from the incinerator to the grate inside the incinerator. ) also has a structure in which one tatetsuba is inserted into the upper part.

According to this IXI configuration, the combustion flame can be directly cooled by the exhaust gas circulated into the incinerator, and moreover, the mixing and stirring effect of the combustion gas is enhanced to completely remove unused components in the combustion gas. Since combustion can be carried out, the temperature of the exhaust gas at one outlet of the furnace can be adjusted within a constant range of 191, and the generation of nitrogen oxides can be suppressed well. Mako, J
Incineration of JI scum The grate inside Jino 1 I) also part 11 1
Circulation 17rf d<Since there are 6 meals in the exhaust gas, 5 meals will occur]j
do not have,.

That's it for the book:) lj II, I will explain one actual hiij example based on N songs.

In the C1Δ1 diagram, (]) is, for example, capital? IC, /7
This is an incinerator, and inside this ヅρ゛6 〃-1(1) 1 (J1 plural fire first) child (21 is installed 1'3 times C), this person Fifr child. (2) Yo I] is also upper part 1
The e-th J+'+ξta air gas blowing nozzle (3) on the S side is installed. (4) is written in 1) B; t-loading hopper that throws 1 piece of garbage into the Jmu mower (1); gas cooling length 1ζ1゛,
(6) Jjt sucked from the garbage bit!+
Jj/l river - If ttL! h'mu furnace (
1) Force feeding J'J'111. ．． 1-1(7)
is IU.

Air dust collector, (8) means visit to China jl'i', (9) means force) ゛(missing, (III LL J) 1 air gas circulation v; 1 ventilation (,, 4).

The garbage sent into the incinerator (1) from the input hopper (4) is pushed into the incinerator (+;
Due to the combustion air introduced from the bottom of the cylinder (2) °C
Incinerated on 1st fire (2). The combustion exhaust gas is cooled to approximately 300°C by a gas cooling device 1':'i (!il), added with Ca(OH) powder, and removed by a 1u air dust collector (7). After being JJ'l, I was invited j1
It is released into the air via the n wind 4ffa (8) and the chimney (9). Th2 j,, acid famine suppression +li
i< II! J is the direction of air for firing that is introduced from the bottom of the grate (2). ) included, grate (2) J
:Promotes the gasification of C2 waste and suppresses the generation of C'4L accumulated oxides.

Then °C1 after cooling and dust removal 1j: 2 gas 0)! i
l:Exhaust force circulates j'8%tffll windtKA Ot
) Air is blown into the incinerator (1) from the +υ1° gas blowing nozzle (3) to cool the flame and reduce the exhaust gas temperature to within the specified range -11,1. If you say the same 111, crab (mo)? :I, mix gas・j%ノ゛I
L, 'r Complete combustion. However, temporarily,
] It is also possible to blow all of the J1 gas into the furnace (1).

In this way, due to the direct cooling of the combustion flame by the incoming exhaust gas and the mixing of the impatience gas and the 17 present effect, J: 11,
19) Smooth complete combustion can be achieved with low oxygen temperature υ], and 1 liter at the furnace outlet is 4.5 liters (J + ?L of gas)
The temperature (if) can be adjusted within a certain range, and the generation of accumulated oxides can be effectively suppressed as shown in FIG.

Exhaust gas incineration method (1) Internal fire grate (2)
) and l) are also circulated to the upper part, so there is a risk that the grate (2) etc. will be eaten by (jI x)S food components in the air gas (40 (I.na Jjfl, 1) Figure 2 shows the exhaust gas 111a flowing from the ter 1 outlet 111a ICI b; t+ r; o
This is an explanatory diagram of the relationship between the primary?
J nitrogen, ・)・Mi1 atomide concentration, (δ'j 1lil11
is the primary air ratio, and one point "JX,'4< (b)
Is the conventional IJ, lζ2J, and the 11 parts of the Mai Czudo, one after the other! Send the energy into the iE, °c/, a r-li-! According to the present invention, as explained above, if l111Jζtjx people are placed in the furnace, the gas is
, jtl, 'Can directly cool the quenching flame, and can reduce the amount of combustion gas by 1J11 units. Since the temperature of the gas coming out of the furnace is 1y,
: can be set to a predetermined range ll-11 yen, and the occurrence of 51 bow attack ljj monsters can be suppressed to a good μ■゛.
Shy. Yota, nol (4; f, gas;, 1 n, J,
11 The fire inside the furnace A・1"'l-1'J"1) is also upper 1S
Circulation 1 to l-! , l is injected into the exhaust gas.)
There is a risk that fire will occur due to the power of food production.

[Brief explanation of drawings]

The drawings are part of the present invention 71j1. The first r? J l, L incineration system skin 1! lfi (?
lS diagram, Figure 2132 (conventional force Vmi and σ) is an explanation of the nitrogen chloride Jllll jlil effect that is 1 sq. ...Tuesday, (te)ko, (3)...j711 public t gas 1 lack iΔI nozzle,
(5 houses...gas cooling system, screaming...1) 1ki kasu ii+
“i D”i ij[1Ali4. <6 u Agent Hiroshi Morimoto (Oshisat%ζ1t6fu WON

Claims (1)

[Claims] 1. Transfer the cooled exhaust gas discharged from the incinerator to the grate inside the incinerator. ) is also circulated to the upper part +14. , a nitrogen oxide suppression operation method for incineration 1.