JPH0243114B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for preventing gas and dust leakage in a rotating sliding contact portion of a rotary kiln.

(Prior Art and its Problems) As means for preventing the leakage of gas and dust from the rotating sliding contact portion of a rotary kiln, there are methods in which the air seal material is made of a metal material or a rubber material.

Air seals made of metal materials have high heat resistance, but they can cause errors in the roundness of the kiln, misalignment of the axis during assembly, etc.
Due to thermal deformation during use, the sealing material and the rotating part of the kiln cannot be brought into close contact, resulting in incomplete sealing.

On the other hand, air seals using rubber materials have the advantage of being able to maintain a perfect seal by following the errors and deformation of the kiln, but on the other hand, they have low heat resistance. It is necessary to set the rubber seal at a position sufficiently distant from the inner wall, and there is a problem that the seal portion becomes large.

(Means for Solving the Problems) The present invention allows the seal portion to be filled with an air flow such as air or an inert gas, and the fluid cools the elastic material seal such as rubber and the seal sliding surface. This prevents the leakage of combustion gas and solves the above problem.

The rotary kiln rotating part gas leakage prevention device of the present invention includes seal sliding surfaces 16 formed on the outer periphery of both ends of the rotary kiln 1, fixed ducts 5 disposed facing each end of the rotary kiln 1, and communicating with the inside of the kiln. 5, there are provided inner and outer double elastic material seals 6, 6 which are in sliding contact with the seal sliding surface 16.

A ventilation chamber 8 surrounded by the fixed duct 5 and the outer periphery of the kiln is formed between the elastic material seals, and a storage chamber 81 for gas leaking from the end face of the kiln is formed between the elastic material seal 6 on the fixed duct side and the fixed duct 5. Forming and ventilation chamber 8
is provided with an inlet 82 and an outlet 83 for taking in airflow from the outside and letting it pass through.

An electric throttle valve 84 is installed at the outlet 83 or the inlet 82.
are connected.

A slight differential pressure detector 91 is provided in both the ventilation chamber 8 and the gas reservoir chamber 81 to detect the pressure difference between the two chambers, a temperature detector 92 is provided in the ventilation chamber 8, and a slight differential pressure detector 91 is provided in the ventilation chamber 8. The opening degree of the throttle valve 84 can be adjusted based on the signal from the temperature sensor 92.

(Operation and Effect) Outside air is forced through the inflow port 81 and exhausted through the outflow port 83 while maintaining the state in which the ventilation chamber 8 is filled.

Even if some of the high-temperature combustion gas in the rotary kiln 1 leaks from the fine gap between the end of the kiln 1 and the main body 51 of the fixed duct 5 and flows into the gas reservoir chamber 81, the sliding surface 16 of the kiln 1, Gas leakage into the ventilation chamber 8 is prevented by the rubber seal 6 which is pressed against the rubber seal 16 and is in close contact with the gas seal 16 .

Even if the amount of gas in the leak gas storage chamber 81 increases and the internal pressure rises, the slight differential pressure detector 91 detects the pressure difference with the fluid ventilation chamber 8 and automatically adjusts the opening of the throttle valve 84 at the outlet 83. The internal pressure of the ventilation chamber 8 is constantly adjusted by
Since the internal pressure is maintained higher than the internal pressure of the leak gas storage chamber 81, even if fluid leaks from the ventilation chamber 8 to the storage chamber 81, gas will not flow from the storage chamber 81 to the ventilation chamber 8. Provides complete sealing effect against gas leakage.

In addition, the elastic material seal 6 is cooled by the air passing through the ventilation chamber 8, preventing the seal from becoming excessively heated, thereby extending the life of the seal.

Furthermore, even if the pressure in the leak gas storage chamber 81 increases as described above, in other words, even if combustion is performed under high pressure in the kiln, gas leakage can be prevented.
It has many excellent effects, such as efficient incineration that increases the combustion rate under high pressure.

(Example) Fig. 2 shows a rotary kiln 1 in a line for incinerating or drying human waste and residue using waste heat from an incinerator 3. On the upstream side of the rotary kiln 1, there are burners and heat exchangers. The air sent from the blower is heated by indirect heat exchange with the waste air passing through the exhaust heat pipe 33 of the incinerator 3.

A deodorizing furnace 31 is connected to the downstream end of the rotary kiln 1 for secondary combustion of combustion gas in the kiln 1 for deodorization.

A dust collector and a ventilator scrubber (both not shown) are connected to the deodorizing furnace 31 to remove dust from the exhaust gas and discharge it from the chimney.

As is well known, the rotary kiln 1 is rotatably supported by rollers 21, 21 on a kiln installation stand 2.

The body 10 of the rotary kiln 1 is provided with an input and an ash outlet 18, and a cylindrical part 1 is provided at both ends of the body 10.
1 and 11 are provided protrudingly, and the gas leakage prevention device 4 according to the present invention is provided in the cylinder portions 11 and 11, respectively, and connected to the fixed ducts 5 and 5 of the heat exchanger 32 and the deodorizing furnace 31 facing each other. There is.

As shown in FIG. 1, the cylindrical parts 11, 11 of the rotary kiln 1 are lined with a refractory material layer 12 on the inner surface, and two protrusions 1 are formed around the cylindrical part 11 on the outer periphery.
3 and 13 are formed in parallel, and the outer periphery of the cylinder between the protrusions is covered with a heat insulating material 17.

The protrusions 13, 13 are formed with a wide outer end, and an annular body 15 is attached to the wide part by screws or the like via a heat insulating material 14, and the outer peripheral surface of the annular body 15 is made of an elastic material as described later. It serves as a sliding surface 16 for the seal 6.

The fixed duct 5 of the heat exchanger 32 and the deodorizing furnace 31 has a duct body 5 with a refractory material 52 laminated on the inner surface.
1, a short tube 54 is connected to the end of the main body 51 via a seal member 53 which also serves as a heat insulating material.

The inner surface of the short tube 54 has the rotary kiln 1
Corresponding to the two sliding contact surfaces 16, 16, two mounting walls 55, 55 are juxtaposed and protrude in an annular shape.

A pair of annular rubber or other elastic material seals 6, 6 is fixed to the inner surface of each mounting wall 55, 55 with screws or the like, and the inner edge of the elastic material seal 6 is placed on the sliding surface 16 along the surface. The elastic material seal 6
The flexible portion 61 is pressed against the sliding surface 16 by an elastic member 7 such as a coil spring that goes around the elastic member 7 .

The space formed between the elastic material seals 6 and 6 becomes a ventilation chamber 8 as described later, and the space formed between the seal member 53 and the short tube 54 on the side of the fixed duct main body 51 and the elastic material seal 6 is used to prevent leakage gas. This becomes a storage chamber 81.

In the short tube 54, between the mounting walls 55, 55,
An inlet 82 and an outlet 83 of the ventilation chamber are opened, and a throttle valve 84 is provided at the inlet 82 or the outlet 83.

Both chambers 8 and 81 are equipped with a slight differential pressure detector 91 that detects the pressure difference between the two chambers, and the ventilation chamber 8 is equipped with a temperature detector 92 that detects the temperature of the circulating air. .

The slight differential pressure detector 91 and temperature detector 92 are connected to the throttle valve 84 via the control section 9.

However, outside air is forced through the inlet 82 and the ventilation chamber 8
While maintaining the filled state, the air is exhausted from the outlet 83.

Even if some of the high-temperature combustion gas in the rotary kiln 1 leaks into the leak gas storage chamber 81 through the fine gap between the end of the kiln 1 and the main body 51 of the fixed duct 5, the elastic member 7 sliding surface 16,
Gas is prevented from leaking into the ventilation chamber 8 by the rubber seal 6 which is pressed against and in close contact with the gas chamber 16 .

Even if the amount of gas in the leak gas storage chamber 81 increases and the internal pressure rises, the slight differential pressure detector 91 detects the pressure difference with the fluid ventilation chamber 8 and automatically adjusts the opening of the throttle valve 84 at the outlet 83. Since the internal pressure of the ventilation chamber 8 is always maintained higher than the internal pressure of the leakage gas reservoir chamber 81 by adjusting the Gas does not leak into the ventilation chamber 8, and a complete sealing effect against gas leakage is achieved.

In addition, the elastic material seal 6 is cooled by the air passing through the ventilation chamber 8, preventing the seal from becoming excessively heated, thereby extending the life of the seal.

Furthermore, even if the pressure in the leak gas storage chamber 81 increases as described above, in other words, even if combustion is performed under high pressure in the kiln, gas leakage can be prevented.
It has many excellent effects, such as being able to perform efficient incineration that increases the combustion rate under high pressure.

The throttle valve 8 is controlled by a signal from a slight differential pressure detector 91 and a signal from a temperature detector 92, and the controller 9 determines which of the two detectors is larger than the throttle valve 8. Control is performed so that priority is given to the one requesting the opening degree.

It goes without saying that the configuration of each part of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the technical scope of the claims.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the rotating part gas leak prevention device, and FIG. 2 is an explanatory diagram of the connected state of the rotary kiln. 1... Rotary kiln, 16... Sliding surface, 6
. . . Elastic material seal, 8 . . . Ventilation chamber, 81 . . . Retention chamber.

Claims (1)

[Claims] 1 A seal sliding contact surface 16 is formed on the outer periphery of both ends of the rotary kiln 1, and the seal sliding contact surface 16 is brought into sliding contact with the fixed ducts 5, 5, which are arranged to face both ends of the rotary kiln 1 and communicate with the inside of the kiln. Inner and outer double elastic material seals 6, 6 are provided,
A ventilation chamber 8 surrounded by the fixed duct 5 and the outer periphery of the kiln is formed between the elastic material seals, and a storage chamber 81 for gas leaking from the end face of the kiln is formed between the elastic material seal 6 on the fixed duct side and the fixed duct 5. The ventilation chamber 8 is provided with an inlet 82 and an outlet 83 through which airflow is taken in from the outside, and an electric throttle valve 84 is connected to the outlet 83 or the inlet 82 to close the ventilation chamber 8 and the gas reservoir. The chamber 81 is equipped with a differential pressure detector 91 that detects the pressure difference between the chambers, and the ventilation chamber 8 is equipped with a temperature detector 92. A rotary kiln rotating part gas leak prevention device characterized in that the opening degree of a throttle valve 84 can be adjusted.