JPH07315896A - Installation for baking cement - Google Patents

Abstract

PURPOSE:To provide the cement-baking installation capable of utilizing the combustion heat of wastes. CONSTITUTION:A fluidizing baking oven 6 at whose lower part a preheated air-charging port 22 is disposed so as to enable the formation of the fluidized bed 21 of a cement raw material (s) therein and which is provided with a fuel chute 12 and an auxiliary burner 13 at positions, respectively, near to the upper part of the fluidized bed 21 is prepared. The cement raw material (s) preliminarily heated and calcined with a preheater 7 is fed into the fluidizing baking oven 6, and a waste ground material produced by grinding a flammable waste is fed into the fluidizing baking oven 6 with a fuel-feeding device 14 through the fuel chute 12. While the fluidized bed 21 of the cement raw material (s) is formed, the waste ground material is burned by the aid of an auxiliary fuel fed from the auxiliary burner 13 to bake the cement raw material (s) into a clinker. The baked clinker is guided into a clinker cooler 10 and cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cement burning equipment.

[0002]

2. Description of the Related Art Conventionally, rotary kilns have been widely used as cement burning equipment. FIG. 2 shows an example of a general cement plant. In the figure, reference numeral 1 designates a rotary kiln which has a cylindrical shape extending in the axial direction and which is horizontally placed in an inclined state such that an upstream end 1a is raised. The rotary kiln 1 is supported by a support roller (not shown) at a plurality of positions in the axial direction thereof and is rotationally driven by an electric motor 2.

A preheater 3 for preheating the cement raw material s is provided on the upstream side of the rotary kiln 1, and a clinker cooler 4 is provided on the downstream side of the rotary kiln 1 on the clinker cooler 4 side. The base portion is fixed and the tip end portion is the downstream end portion 1 of the rotary kiln 1.
The high temperature combustion gas resulting from the combustion of the fuel injected from the burner 5 inserted in b is introduced from the preheater 3 to the upstream end 1a of the rotary kiln 1, and the rotary kiln 1 rotates as the rotary kiln 1 rotates. The cement raw material s transferred toward the downstream end 1b of the clinker is fired into a clinker, and the clinker that is fired and discharged from the downstream end 1b of the rotary kiln 1 is cooled by a clinker cooler 4. ing.

[0004]

However, the above-mentioned cement burning equipment has a problem that a large site is required to horizontally install the long rotary kiln 1.

In recent years, an apparatus capable of firing cement by a spouted bed type fluidized bed firing furnace is being developed instead of the rotary kiln 1 as described above. On the other hand, a fluidized bed type incinerator is partially used as an incinerator for municipal waste and industrial waste.

In view of the above-mentioned circumstances, the present invention has been made with the object of providing a cement calcination facility which can utilize the heat of incineration of waste by synthesizing the technologies focusing on both the above-mentioned fluidized furnaces. is there.

[0007]

According to the present invention, a preheated air introducing portion is provided in the lower part so that a fluidized bed of cement raw material can be formed therein, and a fuel chute and an auxiliary burner are provided near the upper portion of the fluidized bed. A fluidized firing furnace, a preheater that preheats and calcinates cement raw material and supplies it to the fluidized firing furnace, and a fuel supply that supplies waste crushed material obtained by crushing combustible waste to a fuel chute of the fluidized firing furnace. Cement calcination, characterized by comprising an apparatus and a clinker cooler for guiding and cooling the calcined clinker by burning the crushed waste material in the fluidized calcination furnace while being assisted by auxiliary fuel from an auxiliary burner. It relates to equipment.

The fuel supply device receives a waste and stores the receiving hopper, a crusher that crushes the waste cut out from the receiving hopper, and a feed that receives and stores the waste crushing material crushed by the crusher. The hopper and the measuring device for measuring the waste crushed material cut out from the feed hopper and guiding the waste crushed material to the fuel chute of the fluidized-fired furnace are preferably configured.

[0009]

Therefore, according to the present invention, the cement raw material supplied from the preheater to the fluidized-fired kiln is used as a fluid medium to form a fluidized bed by the preheated air blown into the preheated air introduction section at the lower part of the fluidized-fired furnace, and the fluidized bed is fluidized by the fuel supply device. The waste crushed material supplied to the firing furnace is agitated and inverted to increase the frequency of contact with the cement raw material and oxygen, and the waste crushed material is burned together with the auxiliary fuel from the auxiliary burner. The clinker cooler is fired to a clinker cooler, and the clinker is cooled by the clinker cooler.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing an embodiment of the cement calcination equipment of the present invention. In FIG. 6, 6 is a preheated air introduction part 22 at the bottom so that a fluidized bed 21 of cement raw material s can be formed inside. The fluidized firing furnace 6 has a vertically long cylindrical shape and has a fuel chute 12 for supplying fuel to a position near the upper portion of the fluidized bed 21. An auxiliary burner 13 for auxiliary fuel is provided at the same height position.

Further, the preheated air introducing section 22 is provided with an air diffuser plate 23 provided in a lower portion inside the fluidized firing furnace 6, and the air diffuser plate 23.
It is composed of an air chamber 24 defined in the lower portion and an air duct 11 for blowing preheated air 25 for combustion into the air chamber 24.

Further, a preheater 7 for preheating and calcination of the cement raw material s is arranged above the fluidized-fired furnace 6 like the conventional preheater, and the cement raw material s from the preheater 7 is a raw material chute 9. Through which the exhaust gas produced during combustion, which will be described later, is introduced into the preheater 7 through the gas duct 8. ing.

A clinker cooler 10 for cooling the clinker fired by the fluidized-bed firing furnace 6 is provided below the fluidized-bed firing furnace 6.

Further, in the vicinity of the fluidized-bed firing furnace 6, there is provided a fuel supply device 14 capable of crushing combustible waste and supplying it to the fluidized-bed firing furnace 6 as fuel. Receiving hopper 15 for receiving and storing waste
A crusher 17 for crushing the waste cut out from the receiving hopper 15 by the cutting conveyor 16; and a feed hopper 19 for receiving the waste crushed material crushed by the crusher 17 via the communication conveyor 18 and temporarily storing the crushed material. And a measuring device 20 for measuring the waste crushed material cut out from the feed hopper 19 and guiding it to the fuel chute 12 of the fluidized firing furnace 6.

Next, the operation will be described.

Combustible waste (for example, old tires) thrown into the receiving hopper 15 of the fuel supply device 14 is supplied to the crusher 17 via the cutting conveyor 16 and crushed by the crusher 17 and crushed by the crusher 17. The waste crushed material is fed to the feed hopper 19 via the communication conveyor 18 and temporarily stored in the feed hopper 19.

The waste crushed material stored in the feed hopper 19 is supplied to the measuring device 20 in a timely manner, and an appropriate amount of the waste crushed material is used as fuel through the fuel chute 12 while being measured by the measuring device 20. The cement raw material s, which has been put into the fluidized-bed firing furnace 6 and preheated and calcined by the preheater 7, is fed into the fluidized-bed firing furnace 6 through the raw material chute 9, and the air duct 11 is provided in the air chamber 24 below the fluidized-bed firing furnace 6. When the preheated air 25 is blown in through the cement raw material s, the cement raw material s becomes a fluid medium and flows together with the waste crushing material to form the fluidized bed 21, and the waste pulverizing material is agitated and inverted to mix the cement raw material s and Increases the frequency of contact with oxygen, and high temperature cement raw materials
The waste crushed material in contact with is burned to promote the burning. At this time, depending on the combustion state of the waste crushed material, the auxiliary burner 13 is ignited to assist the combustion of the waste crushed material, and the fluidized firing furnace 6 is heated to a predetermined temperature necessary for firing the cement raw material s into a clinker. Keep inside.

The clinker calcined from the cement raw material s in the fluidized-bed firing furnace 6 grows in the fluidized bed 21 and becomes large, falls into the clinker cooler 10 by its own weight, and is cooled by the clinker cooler 10.

Exhaust gas generated in the fluidized-bed firing furnace 6 rises into the preheater 7 through the gas duct 8, and part of the thermal energy of the exhaust gas is due to preheating and calcination of the cement raw material s in the preheater 7. The fine powder of the cement raw material s, clinker, etc., which is consumed in the exhaust gas and is separated into the exhaust gas is returned to the fluidized-bed firing furnace 6 through the raw material chute 9 and the residual exhaust gas is discharged from the top of the preheater 7 and appropriately treated. It

According to the above, since the fluidized firing furnace 6 capable of utilizing combustible waste as fuel is used as the cement firing facility, the waste can be utilized for firing the cement raw material s, and Since the glass and solid matter in the waste that remains in the incineration ash as incombustibles that are not processed by ordinary incineration are generated as a part of the product clinker by high temperature firing, incineration residue does not occur. Further, the incineration exhaust gas discharged from the fluidized-bed firing furnace 6 is guided to the preheater 7 and used for preheating and calcination of the cement raw material s.
Generation of Ox, NOx, etc. is suppressed to a low level, which is almost the same as in the conventional cement process.

The present invention is not limited to the above-mentioned embodiment, and the preheated air introducing portion may be constituted by, for example, a plurality of air diffusing pipes, and the scope of the present invention is not deviated. Of course, various changes can be made within.

[0023]

According to the cement burning equipment of the present invention, various excellent effects as described below can be obtained.

I) Since the fluidized-bed firing furnace that can use waste as fuel is used as the cement burning facility, the waste can be used not only for incineration but also for burning cement, which is economically advantageous. Is enormous.

II) Glass and solid components in the waste that remain in the incineration ash as incombustibles that are not processed by ordinary incineration are produced as a part of the product clinker by high temperature firing, so no incineration residue is generated. .

III) Since the incineration exhaust gas discharged from the fluidized bed kiln is guided to the preheater and used for preheating and calcination of the cement raw material, SOx, NOx, etc. in the exhaust gas are generated in substantially the same manner as in the conventional cement process. Suppressed to a low level.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of an embodiment of a cement burning facility of the present invention.

FIG. 2 is a configuration diagram showing an outline of an example of a conventional cement burning facility.

[Explanation of symbols]

 6 Fluidized-fired furnace 7 Preheater 10 Clinker cooler 12 Fuel chute 13 Auxiliary burner 14 Fuel supply device 15 Receiving hopper 17 Crusher 19 Feed hopper 20 Metering device 21 Fluidized bed 22 Preheating air introduction part s Cement raw material

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Claims (2)

[Claims] 1. A fluidized-fired kiln having a preheated air introduction part at a lower part thereof so as to form a fluidized bed of a cement raw material therein, and a fuel chute and an auxiliary burner at positions near an upper portion of the fluidized bed, and a cement raw material. A preheater for preheating and calcination of the fluid to the fluidized-fired furnace; a fuel supply device for supplying waste crushed material obtained by crushing combustible waste to a fuel chute of the fluidized-fired furnace; The cement burning facility is provided with a clinker cooler that guides and cools the burned clinker by burning the crushed waste material while being assisted by the auxiliary fuel from the auxiliary burner. 2. The fuel supply device receives and stores a receiving hopper that receives and stores waste, a crusher that crushes waste cut out from the receiving hopper, and a waste crushing material crushed by the crusher. The cement calcination equipment according to claim 1, comprising a feed hopper and a measuring instrument for measuring the waste crushed material cut out from the feed hopper and guiding it to a fuel chute of a fluidized calcination furnace.