JPS58185460A - Manufacture of cement clinker - 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] The present invention relates to a method for producing cement clinker.

The process for manufacturing cement consists of preparing a homogeneous mixture of raw materials, firing this mixture to form a cement clinker, and crushing the clinker tubes to obtain a fine powder. When crushing clinker, control the hardening of cement by controlling a small amount of auxiliary agent 1, for example, masonry. The grinding and mixing of cement raw materials is known as wet milling method (wet milling method) and dry milling method (drY--11 mouths) depending on whether it is carried out in a wet mill or in a dry state.
The method of jl is used. The so-called semi-dry grinding method rse
It is known as the mi-dry-m order I). A variation of the above method has also been used in which the raw material is ground dry and then formed into granules using water and metal, which are then fed to the kiln V.

As a kiln for producing cement clinker *v
In J, a discontinuous two-way kiln is used, while in Kyoza, a ring kiln and a rotary kiln are used.

The rotary kiln is made of standard gVII4 and fire-resistant 2
It consists of a long tube with an inning. This rotary kiln rotates with its axis fully centered at 0.
First, the rotary kiln is tilted to form an angle with the horizontal, thus resulting in a high-strength end of the feedstock being fed to the high-strength end of the zero-tally kiln. slowly descends toward the lower end of the rotary kiln. The angle of inclination of the rotary kiln tube is -2
'1~2@, and one rotation speed is 3o-i for one rotation
to seconds. Its diameter is over 7m and its length is
Reach m[. A kiln is heated using a fossil fuel such as coal, oil or gas by a burner installed at the bottom of the kiln. The feedstock introduced into the kiln moves downwardly in the kiln countercurrently to the flow of residual combustion gases, drying and preheating the feedstock as it moves toward the bottom of the kiln; 1! After hardening, it is fired to form a clinker tube. This clinker is cooled with air in a cooler provided at the end of the kiln, and this air is sucked in and used as combustion air, ie, secondary air. The border of the rotary kiln is usually provided with a planting device for transferring the heat of the kiln gas to the raw material.

The temperature for making Cement Talin Cartm in a rotary kiln is 1300~IZO depending on the type of IE material.

Varies in the range of °C. The time required for the moxibustion of raw materials to pass through the rotary kiln varies depending on the function of the kiln and the production volume, but is 1-time. The reason why the raw material buying time in a conventional rotary kiln takes such a long time as described above is that the reactions occurring in the kiln, namely drying, preheating, baking, and the rate of clinker production, are dependent on the temperature of the solid material. and this temperature f#
'i is influenced by the rate of conduction of heat from the residual combustion gases to the solid material. The rate of heat transfer between the residual combustion gases and the raw material is slow and unsatisfactory, which makes it possible to reach the minimum thickness suitable for the formation of 100 ton cement. It is essential to build a large kiln. All of these things add to the total equipment cost.

In a kiln, if the mixture of raw materials used for making cement clay/car can be raised very quickly, or almost instantaneously, to a temperature higher than that obtained in a conventional rotary kiln. The leakage time of the feedstock can be significantly reduced, resulting in a shorter kiln length needed for the same production capacity. Additionally, the increased temperature also significantly increases the rate of chemical reactions occurring within the kiln. The residence time of the raw materials in the kiln decreases by [K] due to the increase in the rate of chemical reactions due to the increase in temperature.

The present invention makes it possible to obtain such high temperatures that heretofore were thought to be practically impossible and only theoretically possible. In addition, the present invention provides a method for producing cement liqueur in a reactor that allows the reaction to be carried out in large quantities without causing a nuisance.

The method of the present invention and the reactor used to practice it use radiant energy as a heat source and the reaction is carried out inside a fluid retention screen that prevents the reactants from coming into contact with the interior surfaces of the reactor. In conventional reactors, the heat required to carry out the reaction is transferred to the reactants by convection and (also ti) conduction, but there are significant problems with this method of heat transfer.
Accordingly, there are t! of reactions that can be carried out. Class II and limited scope. The seventh problem is that the reaction temperature is limited, and the limit is determined by the resistance to high temperatures of the materials that make up the walls of the reactor. The second problem is that in a conventional reactor, the vessel wall has the highest temperature 1 of the reaction system, so the vessel wall is not the ideal reaction site in the reaction system, and therefore the reaction product is It occurs when things accumulate on the walls of the vessel. This accumulation of reaction products reduces the ability of the reaction system to transfer heat to the reactants, resulting in
To maintain the initial level of reaction, it is necessary to gradually increase the temperature of the heat source, which may eventually exceed the heat resistance of the reactor wall material. .

In the present invention for rounding cement clay/car at high temperatures, an annular casing of an inert fluid substantially transparent to radiation is formed: this casing has a substantially axial length.

The raw mixture is then passed along a predetermined path substantially coinciding with the axis of the casing into the core of the casing.
e) is made to flow and the above-mentioned raw material is made to stay inside the casing. Once the flow of the feedstock is initiated, high intensity radiant energy is applied through the casing and coincident with at least a portion of the flow path of the feedstock. As a result, sufficient radiant heat is absorbed into the center of the casing to raise the temperature of the feedstock to the level necessary to initiate the reaction that produces cement clinker.

If the feedstock itself is permeable to radiant energy, a radiant energy absorbing material is introduced into the feedstock stream.

This energy absorbing material will absorb enough radiant energy to raise the temperature of the core of the casing to the desired temperature. However, even though the raw materials are permeable to radiant energy, there may be cases in which one or more of the reaction products absorb radiant energy; in such cases, once the reaction begins, The energy absorbing material is separated from the raw material fluid and the reaction continues.

In a high temperature reactor for carrying out the present invention, r is necessary.
Substantially all of the heat is transferred to the radiant feedstock. Reactors of this type are described in several patent specifications. The reactor consists of a tube 9 having one inlet end and seven outlet ends, the interior of which constitutes a reaction chamber in which the reaction can take place. Introducing an inert fluid into the reaction chamber forms an annular protective casing for the internal surface of the reaction tube. By introducing the raw material into the reaction tube through the inlet end, the raw material is moved along a predetermined path in the axial direction of the reaction tube. A casing made of inert fluid keeps the raw materials inside the reactor in the center of the reactor and prevents them from coming into contact with the reaction tubes.

generating and delivering high-intensity radiant energy within the reaction chamber in alignment with at least a portion of the feedstock path;
Sufficient radiant energy is absorbed to raise the temperature of the feedstock to a very high temperature.

The method for producing cement clinker of the present invention utilizes radiation to transfer heat to raw materials for producing cement clinker.

The first condition to be considered regarding heat conduction in the method of the present invention is the radiant energy absorption efficiency of the raw material. The annular casing of inert fluid for protecting the walls of the reactor must be permeable to radiation and therefore have a very low radiant energy absorption efficiency.

This allows radiant energy to be transmitted through the annular casing to the feed stream with little or no energy loss. The heat transfer is almost instantaneous and can be controlled quickly and precisely. In the method of the invention, the temperature If in the center of the reaction chamber or reaction tube can be raised to a very high temperature, while the annular protective casing is kept at a relatively low temperature. According to this method, radiation of 1! i! F
K can supply radiant energy.

According to the present invention, the raw material is crushed into 1ft-L according to the process of pulverizing the raw material and the wet milling, dry milling or semi-dry milling method.
Provided is a method for producing cement crepe/car, comprising the steps of pre-homogenizing, grinding and homogenizing, and transferring heat from the hot gas flowing out of the reactor to the raw material before it is introduced into reaction 5. be done.

The An reactor consists of a tube having an inlet end and an outlet ll end, and the interior of the tube constitutes a reaction chamber in which the reaction takes place. An inert fluid is introduced into one reaction chamber to form an annular protective casing for the interior surface of the reaction tube; this inert fluid is preferably substantially permeable to radiation. - The raw material is introduced into the reaction chamber from the inlet end in such a way that the raw material passes through a passage coaxial with respect to the reaction tube. Heat is transferred radiatively to the feed stream by generating high intensity radiant energy and delivering it to the interior of the reaction chamber in alignment with at least a portion of the path of the feedstock.

At the outlet end of the high temperature reactor, the W material cools and/or quenches the cement clinker produced as it passes through the center of the reaction chamber of the high temperature reactor. Transport and store cooled cement clinker. This cement clinker and other cement components, such as gypsum, are weighed and mixed. Finally, the mixture of cement clinker and the components listed above, such as gypsum, is ground to a uniform particle size.

In the method for producing cement concrete/car of the present invention,
The center of the high temperature reactor, ie the reaction chamber, can reach 1 degree above 3000°C. In addition, since the heat transfer time is almost instantaneous, the time required for the raw material to pass from the W end of the high-temperature warper to the outlet [shoulder] is significantly shorter than in the case of a rotary kiln; Time is 0. /second~to
Hymento clinker, which is 0 seconds, is produced by firing a raw material mixture consisting of one raw material mainly consisting of calcium carbonate and the other raw material mainly consisting of aluminum silicate as described above. Typical materials suitable for use in this method are limestone and clay;
All of these are naturally produced in an extremely wide variety. The types of raw materials used are very wide, so for example, marl, which is of natural origin and consists of a mixture of clay and limestone.

Slate or schist (which are also common raw materials) can be used 1. Besides naturally occurring raw materials, man-made products can also be used as raw materials. Examples include blast furnace slag, coal lumps (
smut), ammonium sulfate and alkaline residues from the alkaline product manufacturing industry. Other materials such as earth, quartzite, noxides and iron oxides are used to control the composition of the raw mixture.

In the method of the present invention, which provides a method for producing cement clay/car at high temperatures, all of the above-mentioned natural or artificial raw material mixtures can be used, and all of these are suitable for producing cement clay/car. 7 that can be fed to the kiln
In particular, according to the present invention, as a mixture of raw materials for producing dry cleaning power, waste from a coal mine washer is used as a further component of the raw material mixture in the production using clay. A method is provided for producing cement clinker in a high temperature reactor using all or a portion of the cement clinker or as an additional component of the raw material mixture that produces the cement clinker.

The waste from the coal ore settlers mentioned above contains certain harmful organic matter, which provides some of the energy needed for the production of cement clinker.

Claims (1)

[Claims] 1. Step of grinding raw materials for cement clinker; dry grinding before introducing the raw materials into a high-temperature reactor. Mixing (semi-dry grinding and wet grinding)
transferring the heat from the hot gas flowing out of the reactor to the raw material before it is introduced into the reactor, and the raw material passes through a substantially four-wheeled path relative to the reaction fiFK. Introducing the above raw materials into the wrinkle reactor from the inlet end of the reactor; cooling the nine cement clinker produced in the reaction chamber at the outlet end of the reactor; cement clinker and other A method for producing cement clinker, comprising the steps of: weighing and mixing with the components; and pulverizing the resulting mixture to a desired particle size. A λ inert waterfall body is introduced into the reaction chamber to form an annular maintenance casing that is substantially transparent to radiation. A method according to claim 1. 3. The conduction of heat to the raw material in the reaction chamber of a still-temperature reactor is reduced by radiation; when the raw material itself is permeable to radiant energy, a substance that absorbs the radiant energy is added to the raw material stream. Introduce. A method according to claim 7. Then, all of the high-intensity radiant energy is generated and transmitted into the interior of the reaction chamber in alignment with at least a portion of the feedstock path. The method according to claim 1JJ1 or claim 3. j. Radiation 'Jk is supplied to the reaction chamber of the high temperature reactor at a radiation density of 10.000 watts/-1 or more, preferably about poo watts/-. Particular r-f Claim No. 1 JJ-1! +
The method described in any of the paragraphs. 4. The temperature of the reaction chamber of the high temperature reactor is set to 3000°C or higher, preferably to -500°C. 4I The method according to any one of claims 1 to j of the fraudulent claims. 7. The time required for the raw material to pass through the wet reactor is 0.
．． / −j 00 seconds. Claims No. 1 - M
4JJ4 if [2 叡 method. 1,! 112. Process according to claim 111, characterized in that the material includes all the materials, natural or artificial, alone or in a mixture, which can be fed to the kiln for the production of cement clinker. The mixture of raw materials is made up of 2% waste from coal mine washers as one of its components, and 9% of the clay content of the above mixture as a substitute for all of it. Alternatively, it may be included as a separate component of the raw material mixture. A method according to any one of claims 1 to 1.