JPH0814794A - Rotary heat regenerator - Google Patents

Abstract

PURPOSE:To prevent the generation of a bad effect produced by dust by installing a nozzle which sprays compressed air to the upstream side of each gaseous body at a high temperature and a low temperature of a revolving heat transfer body and its piping. CONSTITUTION:A device, in which an air nozzle 13 is mounted to a pipe 12, is inserted inside from an internal inspection opening 11 where a proper spacing is given to the upstream side of combustion gas and air from the surface of a rotary heat transfer body 14 and the distance between the tip of each air nozzle 13 and a rotary heating element is set so as to keep a definite value. On the way of the device is installed a union joint 15 so that the nozzle may be oriented at an arbitrary direction. A compressed air is uniformly sprayed from the air nozzle 13 described above radiately for every definite time with force and the dust which is being deposited on meshes of the revolving heat transfer body 14 is arranged to pass through the meshes, thereby preventing the meshes from being clogged with the dust. It is, therefore, possible to operate stably and for a long time even under high temperature corrosive conditions, such as waste gas of a refuse incinerator by operating in this fashion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary heat storage type heat exchanger for recovering heat from a high temperature gas containing dust such as exhaust gas from a refuse incinerator, and particularly to prevention of dust adhesion.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view showing an example of a conventional rotary heat storage type heat exchanger, and FIG. 4 is a view showing the gas flow thereof.
The ceramic heat transfer member (14) having a honeycomb structure is rotated by a motor (not shown) to perform heat exchange between the combustion exhaust gas and air.

[0003] As a conventional dust storage countermeasure for a rotary heat storage type heat exchanger, a separator (purge sector) (26) is provided in a casing (25) of the heat exchanger. In this mechanism, a part of the dust contained in the combustion gas flow G is
In order to prevent the air flow A from being conveyed to the air flow A side and flowing out to the air flow A while passing through the inside of 4), a part of the air flow A is used to separate the air by the separation plate (26). It returns to the combustion gas flow G side. However, in this method, although fine dust can be prevented from moving into the air flow A, dust of a size that cannot pass through the rotary heat transfer body (14) is generated in the combustion gas flow G.
Will accumulate in the upstream part of.

[0004]

When the combustion gas obtained from a waste incinerator or the like is heat-exchanged by a rotary heat storage type heat exchanger, it is necessary to use a rotary ceramic heat transfer body in order to prevent corrosion by the combustion gas. There is a possibility of sex. However, the combustion gas contains a lot of dust, and minute particles pass through the rotary heat transfer body, while others adhere to the surface of the rotary heat transfer body. Adhesion of dust is likely to induce unfavorable phenomena such as deterioration of heat transfer performance and increase of pressure loss. In the conventional method of moving dust to another loop, dust is contained in both loops, so the applicable range is limited.

[0005]

In order to solve the above-mentioned conventional problems, the present inventor has found that in a rotary heat storage heat exchanger for heating a low temperature gas by a high temperature gas containing dust, the high temperature of a rotating heat transfer body is high. And a nozzle for blowing compressed air and a pipe for the same are provided on the upstream side of each low-temperature gas, and a rotary regenerative heat exchanger is proposed.

[0006]

The present invention is configured as described above, and since compressed air can be blown to the upstream side of each of the high temperature gas and the low temperature gas of the rotating heat transfer body, even when a high temperature gas containing dust is used, It is possible to prevent clogging of the heat transfer body in advance, suppress increase in pressure loss without lowering heat transfer performance, and enable stable operation for a long period of time.

[0007]

1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a detailed view of a dust removing device on the combustion gas side. The dust removing device on the air side is the same as the combustion gas side in the vertical direction, and has the same structure.

In this embodiment, an apparatus in which an SUS air nozzle (13) is mounted on a SUS pipe (12) is inserted into the inside through an internal inspection port (11),
An appropriate distance is provided on the upstream side of the combustion gas and air from the surface of the rotary heat transfer body (14), and the tip of each air nozzle (13) and the rotary heat transfer body (14) are set at a constant distance. . A union joint (15) is provided in the middle of the apparatus so that the nozzle can be oriented in any direction. A stiffener (16) is also provided to prevent the device from dripping at high temperatures.

Compressed air is sprayed uniformly from the air nozzle (13) in a fan shape at regular time intervals, and the dust that tends to adhere to the mesh of the rotating heat transfer body (14) is transferred. By passing through the mesh of the body (14), clogging by dust is prevented in advance. By such an operation, it is possible to stably operate for a long period of time even under high temperature corrosive conditions such as waste incinerator exhaust gas.

Here, the compressed air supply means will be described in more detail. Open the air source valve (1) and take in compressed air from a compressed air source (not shown). The amount of air can be known by the flow meter (2). The air heater operation panel (3) is operated to raise the temperature to the set temperature. The supplied compressed air is heated by the electric heater (5) in the air heater (4). Further, high temperature air may be used as the heat source. In that case, the hot air vent valve (23) is adjusted and the compressed air is heated by the heat exchanger (24). As described above, the electric heater or the high temperature air is used individually or in combination of both, the compressed air is heated to the set temperature, and the air nozzle (1) is passed through the heated air supply source valve (6).
Send to 3). Whether or not the heated air temperature is within the set temperature range is monitored by the thermocouple (7) and the digital thermometer (8), and is adjusted by the air heater operation panel (3) if necessary. When using hot air, hot air vent valve (2
3) Adjust the opening. Further, a solenoid valve (9) and a transmitter (10) are installed in the middle of the heated air line so that spraying can be performed at regular intervals. The air nozzles (13) are evenly arranged, and the heated compressed air is intermittently sprayed in a fan shape from the nozzles having a spray angle of 60 degrees, and the rotary heat transfer body (14) is provided.
It is supposed to spread all over. Air nozzle (1
Fine adjustment of the angle and position of 3) is performed by the union joint (15). Further, a reinforcing material (16) is attached to prevent the tilt of the SUS pipe (12) exposed to high temperature.

The dust-containing gas fed into the apparatus through the dust-containing high temperature gas inlet (17) is supplied to the drive motor (1).
8) moving toward the heat transfer body (14) rotated by the heat transfer body (14) and passing through the heat transfer body (14), the dust-containing high temperature air (≈80)
0 ° C.) flows along the partition (19) and moves to the opposite air side. A large amount of dust that has passed through the high temperature side (14) is collected by the dust collector (20). A dust removing device (21) similar to the above is also installed on the air side to blow off a small amount of dust and collect the dust collecting pipe (2).
Lead to 2). By such a series of operations, harmful dust, which is the enemy of the rotary heat storage type heat exchanger, can be removed, and clean high-temperature air can be produced.

The reason why the atomized air is heated in this embodiment is to remove the moisture in the air, but there are other purposes as follows. That is, since it is a heat storage type heat exchanger, its temperature is close to that of the working fluid. Therefore, when the room temperature air is sprayed, the temperature of the rotary heat transfer body is lowered and the heat transfer performance is deteriorated. In addition, the effect of heat shock on the heat exchanger can be reduced by heating in advance. Thus, it is most desirable that the atomizing air be at the same working fluid temperature.

In this embodiment, the SUS pipe (12) is inserted through the internal inspection port (11), but it can be attached by penetrating the casing. Also this pipe (1
The material of both 2) and the air nozzle (13) may be selected according to the temperature level, corrosion resistance, etc., and is not particularly limited to SUS.

[0014]

According to the present invention, the harmful effect of dust on the rotary heat storage heat exchanger can be prevented even under the severe conditions of high temperature corrosiveness and dust-containing environment such as exhaust gas from a refuse incinerator. As a result, reliability can be improved and stable operation can be performed for a long time without impairing the original function of the heat exchanger.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a detailed view of a combustion gas side dust removing device in the above embodiment.

FIG. 3 is a perspective view showing an example of a conventional rotary heat storage type heat exchanger.

FIG. 4 is a diagram showing a gas flow in FIG.

[Explanation of symbols]

 (1) Air source valve (2) Flow meter (3) Air heater operation panel (4) Air heater (5) Electric heater (6) Heated air source valve (7) Thermocouple (8) Digital thermometer (9) Solenoid valve (10) Transmitter (11) Internal inspection port (12) SUS pipe (13) Air nozzle (14) Rotating heat transfer body (15) Union joint (16) Reinforcing material (17) Dust-containing high temperature gas inlet (18) Drive Motor (19) Partition (20) Dust collector (21) Dust remover (22) Dust recovery pipe (23) High temperature air vent valve (24) Heat exchanger (25) Casing (26) Separation plate (purge sector)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shizuo Yasuda 12 Nishikicho, Naka-ku, Yokohama City Mitsubishi Heavy Industries Ltd. Yokohama Works

Claims (1)

[Claims] 1. In a rotary heat storage type heat exchanger for heating a low temperature gas by a high temperature gas containing dust, a nozzle and a pipe for blowing compressed air are provided on the upstream side of each of the high temperature and low temperature gases of a rotating heat transfer body. A rotary heat storage type heat exchanger characterized by being provided.