JPS616158A - Cement burning furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] a　Industrial application field The present invention relates to a cement kiln.

b. Conventional technology Traditionally, medium oil, charcoal, etc. have been used as fuel for cement firing, but in 1&K, pulverized solid fuels such as coal are mainly used. The combustibility of these solid fuels varies depending on the characteristics 11 and fineness of the fuel.

It is generally known that the higher the volatile content and the smaller the particle size, the better the combustibility.

According to the research conducted by the present inventors, the flammability of solid fuels such as coal is greatly affected by the temperature at the time of ignition, in addition to the above, and the higher the temperature at the time of ignition, the better the combustibility. It is clear that

Problems to be Solved by the Invention C However, in the past, the fuel supply device was attached directly to the furnace body without surrounding it. Therefore, the fuel injected into the furnace is
Due to the endothermic reaction of the cement raw material, the temperature does not reach a high temperature, which is only about 900 to 1200°C, and the furnace firing rate is slow, resulting in poor combustion efficiency.

The present invention has been made to solve the above-mentioned drawbacks, and provides a high-temperature zone immediately after fuel supply, thereby eliminating the above-mentioned drawbacks.

Means for Solving the d0 Problems The present invention provides a structure in which a ↓1-shaped enclosing part is provided on the wall of the fuel supply part in a calcining furnace for cement firing, which is adapted to the shape of the fuel flame. It is characterized by:

e. Examples The present invention will now be described with reference to the illustrated embodiments.

In Fig. 1, l is the main body of the jet calcination furnace, which is
The second part is provided with an L part furnace body 3 via a constriction part 2, and the bottom part is provided with an inverted conical part 4 and a kiln exhaust gas introduction pipe 5 connected thereto. Reference numeral 6 designates a conduit connected to the Sazbennoyon preheater, 7 designates an air duct for combustion in the calciner, and 8 designates a raw material supply pipe installed on the side wall of the calciner body 1.

Reference numeral 9 denotes a conical surrounding portion constituting the present invention, and 10 a burner placed facing the portion.

Figures 2 to 4 show the conical surrounding part 9 and the burner 1.
This is an example of the structure of 0.

In the furnace shown in FIG. 2, a surrounding portion 9 is provided in a concave shape with respect to the furnace body 1. The length p of this enclosing portion is generally about 1/3 u below the length of the flame f, and in the illustrated case it is 1/3. Furthermore, the distance between the flame f and the surrounding portion 9 is preferably as close as possible to the extent that they do not touch each other. In the illustrated example, the distance d was 40 mm. The opening angle β of the flame f is normally 30°410°.

On the other hand, it is preferable that the opening angle α of the enclosed portion 9 is larger by 0 to 20 degrees.

The one shown in FIG. 3 has the encircled part 9 projecting from the furnace body 1 by about half, while the one shown in FIG. , all of which are protruded.

Each of the above-mentioned surrounding portions 9 can be formed into a cone or an angular ξ (e shape), and the material thereof may be ceramic, phosphor, or other fire-resistant or heat-resistant material.

In the structure described in "Action" 2, the raw material supplied from the raw material supply pipe 8 flows by the 1% C jetted by the square waste introduced from the kiln exhaust gas introduction pipe 5, and combustion air is supplied from the duct 7 to this. Then, the furnace combustion fuel is sent from the burner 9,
The fact that calcination is performed within the furnace is the same as in conventional calcination furnaces.

At that time, a new furnace λ is supplied from the burner IO.
Since the surrounding part 9 has been heated in advance by the flame, the material is rapidly heated by the radiation generated from the part 9, decomposes, and burns. The surrounding area 9 is heated and this interaction significantly improves the combustibility of the fuel.

g0 Effects of the Invention Using a jet calcining furnace as shown in FIG. 1, which is equipped with the enclosed portion 9 and burner 10 illustrated in FIG. , the present invention was put into practice using fine coal powder as fuel! ! L, I just received the following results.

□ 1゜As seen in the above table, after implementing the present invention, the amount of CO, which is a substitute for unburned matter, was significantly reduced. This indicates that the combustibility of the fuel in the furnace +-[ has been improved.

Note that similar effects can be obtained by using the structures shown in FIGS. 3 and 4.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing a one-jet incinerator to which the present invention is applied;
FIGS. 2 to 4 are vertical conceptual diagrams of the conical enclosing portion used in the present invention. 9...Conical enclosing part, 10...Burner. Figure 1 Figure 2

Claims (2)

[Claims] (1) The furnace wall of the fuel supply part of the calciner is provided with a cone-shaped surrounding part corresponding to the flame shape of the fuel, and a burner is provided at the bottom of the part facing the part. Cement kiln. (2) The lower part of the calcining furnace is formed into an inverted conical shape, an opening is provided at the bottom, this is connected to the rising duct of the kiln, and at least one constriction part is provided directly above the inverted conical part. A cylindrical portion having a cylindrical portion is provided, an upper portion of the cylindrical portion is connected to a cyclone of a suspension preheater, and a fuel combustion air and raw material supply device is provided between the opening and the throttle portion. 1) Cement kiln as described in section 1).