JPS5946415A - Primary air feeder for rotary kiln - Google Patents

Abstract

PURPOSE:To enable to perform smooth firing of pulverized coal for combustion, by installing heating pipe groups for preheating a primary air in the position of a partition wall. CONSTITUTION:A burner 2 is located to the end this side of a rotary kiln 1, heating pipe groups 6, 6'... for preheating a primary air are installed in the upper position of a clinker box 3, being partitioned into a high temperature part 4 and a low temperature part 5, namely the position of a partition wall of a refractory structure which is located in a maner to hang down from an existing ceiling, and a delivery pipe 8 of a high-pressure blower 7 for a primary air is coupled thereto. This permits the supply of the primary air which has high pressure of 1,000-2,000mm. H2O, and high temperature of 300-500 deg.C, and enables the amount of the primary air to be reduced to about 2% of the total air amount.

Description

Detailed Description of the Invention For example, in a rotary kiln that fires cement lamination, there is a burner at the front end of the rotary kiln that uses heavy oil as fuel, or a rotary burner that uses pulverized coal as fuel, or a rotary burner that uses both heavy oil and pulverized coal as fuel. It is possible to set up a burner, and the burner will cause these burning fathers to squirt out into the J-Kurikiruno/,) to be Ichikawa's first order? No flood/:,).
The klicker fired in the rotary kiln is sequentially transferred to the front through the Klinz Box, where it is cooled and taken out as a product. Secondary air is supplied to the clicker box and -Hf9 of cooling air is supplied to the clicker box. That is, the secondary air, which was brought into contact with the Tallinn force in the high temperature section and heated to 10 (near JO'C), was moved from the front end of the second rotary kiln to the rotor IJ K/L.

The fuel flows into the burner and is supplied from around the burner.

Akisha Kimoto had earlier invented a ``primary air supply device for a rotary kiln'' and filed a patent application.

The present invention also [Primary air supply device in rotary kiln]
Fi J's invention, or the purpose of the application is different from that of the original application. Prior to the description of the present invention, the description of the primary air supply system in a rotary kiln, which was previously filed, will be explained with reference to FIG.

Provide a primary air blower 17 at the front end of the rotary kiln 110 to forcefully blow out the interpressure primary air together with the zero fuel ejected from the housing 12. Also Kurinno J-Box 130 effect i'! l+! Heating tube group 16.16' for primary air preheating covers the angle tIib of the end of the ceiling of Group 14, fireproof structure 15.
The primary air is blown from the delivery pipe 18 of [high-pressure blower for secondary air] 7 to the heating tube group 16, 16' for preheating the primary air.
. . . The structure is such that the heat is supplied to the burner 12 after being passed through and preheated.

The primary air blower 19 may take in air directly from the outside air as shown in FIG. Draw pipe 2 provided
The temperature of the aikiki drawn from 1 is raised to 20 o 'C lr';200'', which is supplied to the air supply pipe 24 at a branch part 25, is connected to the air pipe 19 of the air blower 17, and dust is removed using an electric precipitator. C 4" The temperature may be raised to 4 degrees and the air may be evacuated once.

As shown in Figures 1 and 2, 1" for primary air, H'.S 1i-
:'The blower 17 rotates at high speed to blow primary living air into 1 column of water (1
(10mm to 2 (JOOmm Ichikawa and burner 12
−＼Can be supplied and 1 linker box
Heating tube group 16, 11:i' for primary air preheating provided by covering the fireproof structure 15 at the corner end of the ceiling of the high temperature section 14 of 3.
・・・・Trace-1- Depending on the temperature, 300°C to 5
U O 0CK can be supplied to the burner 12-\ without increasing the temperature and maintaining the pressure. This place f3-1
The amount of air (■:) can be reduced to about 2 factors of the total air amount, so
, Ragunbe 142 through 800°C to 1 (1 0 0
The amount of secondary air that is heated to C and flows into the rotary kiln from the front end of the rotary kiln 11 and supplied from around the burner 12 can be 98% of the total air amount.
In this way, fuel ignition and combustion can be carried out smoothly, and fuel consumption can be reduced by about 2% compared to the conventional method. Suitable when using 1/17 pulverized coal fuel for q+j, and can stabilize the ignition and combustion of pulverized coal. In addition, the fire control structure 15 at the corner end of the ceiling of the clicker box, which was easily damaged in the past, is protected by the heating tube group 16, 16' for primary air preheating. We were able to significantly reduce the degree of damage to that area.

Now, in the firing of cement, etc., it has been found that high-quality cement cannot be obtained if the cement produced by firing in a rotary kiln is rapidly cooled in the kiln box. ing.

Therefore, the conventional talin car box has a structure shown in FIG. 3 to rapidly cool the talin car and supply high-temperature secondary air. In other words, there is a high temperature section 1 inside the clinker box 13.
There are 20 low-temperature sections and 20 low-temperature sections.At the boundary between the two sections, there is a partition made of fireworks (+, Y) hanging from the ceiling of Talin Carbonox.
26 are provided. The chestnut 7 car loaded in the licker box 13 is transferred from the primary tip to the front side by means of transfer means 27 made by υ゛LL US. A large amount of cooling air is supplied into the low-temperature section zo from the bottom by a large blower 28, and the majority of the cooling air is drawn from the draw-out pipe 21 installed on the ceiling of the low-sensitivity section. The air is drawn out, heated to about 200°C, and then passed through an electric precipitator 22, a blower 23, and a teripary front 2.
Within 4? A) - Some of the other 12 air is supplied to other parts, such as photoelectric boilers, through the 1) installed on the ceiling of the low temperature section.
It is drawn out into one drawing pipe 29 and supplied from the bottom into the height 7, □ 1, 1 person 1514 by an air blower 30. In the high temperature section 14 of the clinker box, the high temperature clinker K is in contact with soo'c to 100 ['c
The temperature is raised to 7yi, and a part of the required amount of air passes through the soil i'i 14 chamber 31 as secondary air and enters the rotary kiln 11.
It is supplied from around the burner 12. The other part is installed on the ceiling of the high temperature section 14 and drawn by a drawing pipe 32, which is a step before the rotary cylinder is removed.)
9 scam! Pneumatically send for device 6.

! 'IL As shown in Figure 3, the inside of the clinker box 13 is 7th and 1st. The partition wall 26, which has a fire structure of 1 m and is hung from the ceiling of the clinker box to separate it into the clinker box 14 and the low-temperature part 20, is exposed to extremely high temperatures and comes into contact with the high-temperature clinker to cause a chemical reaction. Severe burnout. The high temperature of the partition wall 26 may cause it to burn out during operation.
If there is insufficient air, it will not be possible to supply water to the rotary kiln, and the rapid cooling of the Tallinn force will not be carried out effectively (as a result, it will not be possible to produce high quality cement). The present invention is explained with reference to FIG. 4 showing its second embodiment.
-Ro.

Install burner 2 at the front end of rotary kiln 1. Also,
Clinker box 3 high temperature section 4 and low fi 171'i
The upper part of the clinker box 3, that is, the +I
i4 structure of fire structure) p, '<1) 7- ii;+)
Install heating tube group 6.6' for primary air preheating.

The delivery pipe 8 of the primary air supply pressure blower 7 is connected to the primary air preheating heater group 6, 6', . . . . Mabuko,
Fig. 4 shows J- (6.6) heating tube group for primary air preheating.
’ tip? The burner 2-1 is not directly connected to the corner part of the ceiling of the clinker box 3, and the 11-hole 4-fire structure 15 is partially covered and provided with heating pipes 16, 16' for primary air preheating.
..., and the primary air preheating heating pipe 16.16'.
It is possible to further heat the air by connecting the primary air cylinder 2'. The suction blue 9 of the high-pressure blower crosspiece 7 for primary air may be designed to directly suck in outside air, or as shown in FIG.
A part of the air is extracted by the drowsiness dust collector 22, the blower 23, and the delivery pipe 24 and supplied to other parts, such as a boiler for intoxication. Do what you can.

10-Primary air supply device in Tarigirun by Akira Kipro is the same as the previous invention shown in Figs. 1 and 2 (, primary air = water column 11) OOmm to 20 ( )I
) It is possible to supply the sieved soil to the burner 2 at a high temperature of 3000C to 5000C, and therefore it is possible to reduce the amount of primary air to about 2 times the total amount of air. You can do it. Therefore, 8 U, 00C
High temperature secondary of 1000°C? I hope you can make it to 98%. This allows the ignition and combustion to be carried out smoothly, thereby reducing the amount of combustion costs involved. In particular, it is possible to smoothly ignite and burn pulverized coal. However, the present invention also solves the conventional problem of burnout of the rIqJ fire structure partition wall. Heating tube group for primary complex air preheating 6.6'...
・・・・Please provide high temperature secondary air and N.
It was found that 4 tli of air was added to the air for SP mounting, and the clinker foam, cold water, and llr were obtained, so that it was possible to produce a good product after firing. I can do 44J.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the primary air supply shaft in a rotary kiln, which the present inventor previously invented and applied for a patent for. Figure 3 shows the [1/) structure of the clinker box of a conventional rotary kiln? This is an explanatory diagram. FIG. 4 shows the primary vitality (It;
It is an explanatory view of a feeding device. 1 is a rotary kiln, 2 is a burner, 3 is a clinker box, 4 is a high temperature section, and 5 is a low temperature j'ils. 6 is the heating for primary air preheating) σ group, 7 &:l is the high pressure blower for primary air, and 8 is the delivery pipe.

Claims (1)

[Claims] A burner 2 is provided at the front end of the rotary gill 710, and a heating tube group 6,6' for primary air preheating is installed in the upper part between the high temperature section 4 and low temperature section 5 of the tallinker box 3 (instead of the conventional partition wall, a group of heating tubes 6,6'...
...7 installations are high-speed primary air supply, Kazeiso 7 delivery I
J) g The primary air blown from 13 follows the primary air preheating heating tube group 6.6'...2 to the burner 2-
＼Primary air supply device in a rotary kiln with a structure that allows air to flow