JPH0720559Y2 - Removal device for chlorine and sulfur compounds in preheater rising duct - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chlorine / sulfur compound removing device in a preheater rising duct applied to a preheater part of a cement raw material firing device.

[0002]

2. Description of the Related Art In today's cement raw material firing equipment, in order to utilize the heat quantity possessed by the exhaust gas discharged from a rotary firing kiln (rotary kiln) as effectively as possible, the powder raw material to be fed to the rotary kiln is discharged. I'm preheating. The preheating device for this raw material powder is called a preheater.

In the furnace to the preheater, the compound having a relatively low melting point among the compounds contained in the exhaust gas is solidified again and adheres to the raw material powder. When this raw material powder enters the kiln again and is heated to a high temperature, the low melting point compound evaporates again, is contained in the exhaust gas, exits the kiln, and solidifies in the preheater. By repeating this process, the content of the compound having a relatively low melting point in the exhaust gas is increased.

The powder raw material that has come into contact with such exhaust gas is
Due to the solidification / adhesion of the low melting point compound, tackiness is generated and the compound easily adheres to the inner wall of the preheater, which may cause clogging, resulting in operation failure.

In order to prevent such troubles, a part of the exhaust gas concentrated with the low melting point compound is taken out by bypass, and the dust contained in the exhaust gas is removed by a dust collector such as a cyclone. There is.

[0006] However, when such a method is carried out, the installation of the apparatus is expensive, and the heat loss due to the exhaust gas removed is large.

[0007]

[Problems to be Solved by the Invention] Nowadays, it is necessary to use industrial waste and general waste as a part of auxiliary fuel and raw material. Has been increasing.

The most problematic among them are chlorine compounds and sulfur compounds. Chlorine and sulfur combine with alkali components to form low melting point compounds, which are circulated between the kiln and the preheater to be concentrated and coagulated and adhered to dust and powder raw materials scattered from the kiln butt and sticky powder raw materials. It becomes dust and causes trouble as so-called coating that adheres to the inner wall of the preheater.

An object of the present invention is to solve such a problem without incurring a large equipment cost.

[0010]

The present invention takes the following means in order to achieve such an object. That is, the device for removing chlorine / sulfur compounds in the preheater rising duct according to the present invention includes a through hole formed in the preheater rising duct, a low temperature rod slidably penetrating the through hole, and a low temperature rod including the low temperature rod A low temperature rod drive mechanism for reciprocating between a coaching collection position where most of the rod is inserted into the rising portion and a coating discarding position where most of the low temperature rod is exposed to the outside; It is characterized by comprising low temperature rod cooling means for maintaining the temperature of the rod at a required low temperature.

[0011]

According to this structure, when the low temperature rod is inserted in the preheater rising duct, the low temperature rod is exposed to the atmosphere in the duct. In this state, if the low temperature rod is kept at a low temperature by the low temperature rod cooling means,
The coating containing a large amount of chlorine / sulfur compounds having a low melting point solidifies and adheres to the surface of the low temperature rod.

When the low temperature rod driving mechanism pulls the low temperature rod out of the duct at an appropriate time, the low temperature end, which had been inserted into the high temperature atmosphere in the duct until then, is exposed to the normal temperature atmosphere, and the temperature is lowered. Falls sharply. as a result,
The coating adhered to and collected on the surface of the low temperature rod contracts due to a rapid temperature drop, and for example, falls apart from the low temperature rod in several tens of seconds and falls naturally. The falling coaching may be collected by a hopper arranged below.

Incidentally, it has been clarified from the chemical analysis results of the samples collected at various places that inside the preheater including the cyclone and the rising duct, chlorine and sulfur are most concentrated in the rising duct. Therefore, if a low temperature rod is inserted into this rising duct to coagulate and capture chlorine and sulfur, the collection efficiency will be highest.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a general cement burning equipment in which a preheater 2 is connected to a kiln bottom of a rotary kiln 1, and a chlorine / sulfur compound removing apparatus A according to the present invention is
It is installed in the rising duct 3 of the preheater 2. In this embodiment, a case where the removing device A is installed at one place will be described, but it goes without saying that a plurality of removing devices A may be provided.

As shown in FIG. 2, the chlorine / sulfur compound removing device A has a through hole 4 formed in the preheater rising duct 3 and a low temperature rod 5 slidably penetrating the through hole 4.
2, a low temperature rod drive mechanism 6 for moving the low temperature rod 5 forward and backward between the position inside the duct shown in FIG. 2 and the position outside the duct shown in FIG. 3, and the temperature of the low temperature rod 5 at the required low temperature. And a low temperature rod cooling means 7 for maintaining the above.

More specifically, a plurality of tubes 32 are fixed to the wall 31 of the preheater rising duct 3 by penetrating them, and the outer ends of these tubes 32 are closed by a lid 33. Then, the above-mentioned through holes 4 are formed in the portions of the lid 33 corresponding to the respective tubes 32.

The low temperature rod 5 is an outer cylinder 5 whose front end 51a is closed.
1 and a double-tube type having an inner cylinder (not shown) disposed at the axial center of the outer cylinder 51 and having an open tip. For example, a water supply port 53 is provided at the base end of the inner cylinder. At the same time, a drain port 54 is provided at the base end of the outer cylinder 51. The low temperature rod 5
A plurality of horizontal holes 4 are arranged horizontally corresponding to the number of the through holes 4.

The low temperature rod drive mechanism 6 holds a holding case 61 for holding the base end sides of a plurality of low temperature rods 5, and the holding case 6.
1. A support frame 62 for suspending and supporting 1 so as to be capable of reciprocating in the horizontal direction, and a pair of sprockets 63, 64 axially attached to the front and rear ends of the support frame 62, respectively.
A roller chain 65 stretched between the two sprockets 63, 64; a geared motor 66 for rotating the sprocket 64 to move the roller chain 65 in a forward or reverse direction; and a holding case 61 for the roller chain 65. And a bracket 67 connected to the.

The low temperature rod 5 is driven by the low temperature rod driving mechanism 6 from the insertion position in the duct shown in FIG.
The advancing / retreating operation is performed up to the duct outside drawing position shown in FIG. The low temperature rod 5 is set so as not to come out of the through hole 4 even when it is pulled out from the duct.
A gap is formed between the inner periphery of the through hole 4 and the outer periphery of the low temperature rod 5 so that the coating b attached to the low temperature rod 5 can pass through. Below the low temperature rod 5 at the outside of the duct,
The coaching collection hopper 8 is opened.

The low temperature rod cooling means 7 has a water storage tank 71, a water pump 72 for pumping the water in the water tank 71, a water pump 73 installed in the middle of the water pump 72, and a water pump 72. A flexible pipe 74 for supplying water to the water supply port 53 of each low-temperature rod 5, a flexible pipe 75 for drainage connected to the drainage port 54 of each low-temperature rod 5, and a flexible pipe for drainage thereof. Pipe 75
And a drain pipe (not shown) for discarding water discharged through.

Air for cooling may be used instead of the cooling water.

Next, the operation of this embodiment will be described.

As shown in FIG. 2, when the low-temperature rods 5 are inserted into the preheater rising duct 3 through which the kiln exhaust gas a flows, the low-temperature rods 5 are exposed to the atmosphere in the rising duct 3 at about 1000 ° C. Will be exposed. In this state, when the low temperature rod 5 is kept in a low temperature state by the low temperature rod cooling means 7, the coating b containing a large amount of chlorine / sulfur compound having a low melting point is condensed and adhered to the surface of the low temperature rod 5.

At an appropriate time, as shown in FIG. 3, the low temperature rod drive mechanism 6 pulls the low temperature rod 5 out of the duct 3. That is, the geared motor 66 is rotated to operate the roller chain 65 in the arrow X direction, and the holding case 61 is moved.
Is retracted and each low temperature rod 5 is pulled out until the tip thereof comes out of the through hole 4. Due to the operation, the low temperature rod 5 that had been inserted into the high temperature atmosphere in the duct 3 is exposed to the normal temperature atmosphere, and the surface temperature is rapidly increased due to the circulation of the cooling water c. Fall to. As a result, the coating b adhered to and collected on the surface of the low temperature rod 5 contracts due to a rapid temperature drop, and is separated from the low temperature rod 5 in several tens of seconds and falls naturally. Falling coaching b
Are dropped and collected in the hopper 8 disposed below.

Thereafter, the geared motor 66 is rotated in the reverse direction to operate the roller chain 65 in the direction of the arrow Y, the holding case 61 is moved forward, and the low temperature rod 5 is inserted into the rising duct 3 again. By repeating the above operation, it is possible to effectively prevent chlorine and sulfur from being concentrated inside the preheater 2.

The low temperature rod does not have to have a double pipe structure when a material having excellent heat resistance is used.

The structure of the low temperature rod drive mechanism can be variously modified without departing from the spirit of the present invention.

[0029]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, it is possible to effectively collect chlorine and sulfur compounds in the rising duct of the preheater and prevent the concentration thereof from increasing. it can. Therefore, it is possible to effectively prevent the coating from growing and clogging in each cyclone of the preheater, and to effectively prevent the coating from firmly adhering to and growing on the inner wall surface of the rising duct to which the amorphous refractory is attached. it can. Therefore, it is possible to solve the problem that the operation is stopped due to the clogging caused by the coaching and a great number of man-hours are required for the dangerous recovery work. In other words, it is possible to omit or simplify the work of dropping a coach such as a cyclone, which has been a daily work for preventing such a clogging accident.

In addition, since the device of the present invention has a simple construction in which the low temperature rod is simply put on and taken off from the rising duct, exhaust gas bypass is provided to remove chlorine and sulfur compounds by a dedicated cyclone or the like. It is possible to significantly reduce the equipment cost compared to the above. Therefore, it becomes possible to improve the quality of cement without causing a large increase in equipment.

[Brief description of drawings]

FIG. 1 is a schematic front view including a partial cross section showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the embodiment.

FIG. 3 is an enlarged sectional view showing a main part of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotary kiln 2 ... Preheater 3 ... Rising duct 4 ... Through hole 5 ... Low temperature rod 6 ... Low temperature rod drive mechanism 7 ... Low temperature rod cooling means

Claims (1)

[Scope of utility model registration request] 1. A preheater rising duct, a through hole, a low temperature rod slidably penetrating the through hole, and the low temperature rod is moved forward and backward between an inside insertion position of the duct and an outside drawing position of the duct. And a low-temperature rod cooling means for maintaining the temperature of the low-temperature rod at a required low temperature. A device for removing chlorine / sulfur compounds in a preheater rising duct, comprising: