JPH03241288A - Rotary type regenerative heat-exchange apparatus with overheated spot-detecting device - Google Patents

Abstract

PURPOSE:To equip an infrared sensor at a place having good surroundings at the exterior of a housing, by a method wherein a means whereby electrical signals transmitted from an optical sensor are analized and displayed by imaging, is connected to the optical sensor. CONSTITUTION:Infrared rays collected by a light-receiving probe 5 are transmitted through an optical fiber 6, which is connected to the light-receiving probe 5 and is extended from that place to the exterior of a housing and is laid. The infrared rays reaching an optical sensor 7 are converted to electrical signals, and the electrical signals are converted to digital signals by an A/D converter, in both an analizing device 8 and an image-displaying device 9, which are connected to the optical sensor 7. After that, the digital signals are converted to thermal information by a microprocessor and are displayed by imaging. In this way, it is made possible to equip the optical sensor 7 at the exterior of a rotary type regenerative heat-exchange apparatus.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention relates to a rotary regenerative heat exchange device for removing heat from a heated fluid and giving the heat to a heated fluid. , relates to the above-mentioned rotary regenerative heat exchange device including a device for detecting superheat points in the rotor.

[Prior Art] A rotor that rotates around a central axis is used as a device that continuously recovers the heat held by a heated fluid, such as boiler exhaust gas, and applies this heat to a heated fluid, such as boiler combustion air. A rotary regenerative heat exchange device has been used in the past, which has a rotor that houses a heat transfer element, and exchanges heat between a heating fluid and a fluid to be heated via the heat transfer element.

When boiler exhaust gas is used as the heating fluid, the boiler exhaust gas contains soot and dust as well as a considerable amount of unburned fuel.
! tend to deposit on the surfaces of the heat transfer elements in which they are contained.

Deposits on this heat transfer element can be heated by the boiler exhaust gas passing therethrough, raising their temperature to near the ignition point. This deposit will eventually begin to ignite and create hot spots within the rotor. However, if the rotary regenerative heat exchanger continues to operate without detecting this overheating point, the metal heat transfer element in the rotor itself may generate heat. This will cause a fire in the rotary regenerative heat exchanger.

Therefore, in order to prevent fires in such a rotary regenerative heat exchange device, a rotary regenerative heat exchange device equipped with an overheating point detection device has conventionally been used.

For example, a method has been used in which a large number of infrared sensors are installed near the end face of the rotor of a rotary regenerative heat exchanger to monitor the entire area of the rotor end face.

The infrared sensor was designed to convert the infrared radiation emitted by the hot spot into an electrical signal, and to issue an alarm when the level of this electrical signal reached a certain level.

[Problem to be solved by the invention 1 However, conventional methods have had various problems.

First, the atmosphere inside the rotor of a rotary regenerative heat exchanger is not suitable for an infrared sensor. The temperature inside Unong reaches 150°C to 350°C, so in order for the infrared sensor to function in that environment, constant cooling was required.

Furthermore, there was a risk that the atmosphere inside the housing would enter the inside of the infrared sensor. That is, in addition to the negative effects of soot and dust, there were also negative effects of the corrosive atmosphere.

Furthermore, there is a problem in that maintenance work for the infrared sensor provided inside the housing is not easy. It is difficult to maintain the detection device while the rotary regenerative heat exchanger is in operation.

Furthermore, there were other problems, such as the need to secure space for installing an infrared sensor inside the how song. The problem of securing space was especially important when installing a large number of infrared sensors.

In addition, in the conventional method, it was possible to detect the overheating point inside the rotor and issue an alarm, but it was not possible to directly observe this point with the naked eye.6 The purpose of the present invention is to , by solving the conventional problems and installing the infrared sensor in a good environment outside the housing.
This function can be activated in 11 minutes, making equipment maintenance easier, solving the problem of securing installation space for the detection device, and also making it possible to visually check overheating points inside the rotor. It is an object of the present invention to provide a rotary regenerative heat exchange device with an overheating point detection device for normalization.

[Means for Solving the Problems] The rotary regenerative heat exchange device with a superheat spot detection device of the present invention has the following features:
A central axis, a rotor rotating around the central axis, a heat transfer element housed inside the rotor, a hot spot detection device for detecting a hot spot inside the rotor, and a heating fluid and a heated spot. A rotary regeneration type with a superheat point detection device, which is composed of a housing that houses the rotor and has an inlet and an outlet duct for the heating fluid, and performs heat exchange between the heating fluid and the heated fluid by rotating the rotor. In the heat exchange device, the overheating point detection device includes a light receiving probe provided in the housing for receiving infrared rays emitted from the overheating point, and a light receiving probe for transmitting the infrared rays received by the light receiving probe. Consisting of an optical fiber extending to the outside of the housing, and an optical sensor connected to the terminal end of the optical fiber for receiving infrared rays transmitted by the optical fiber and converting it into an electrical signal, The optical sensor is characterized in that a means for analyzing an electrical signal transmitted from the optical sensor and displaying the image is connected to the optical sensor.

Further, the optical sensor is characterized in that a means for analyzing an electric signal transmitted from the sensor and issuing an alarm is connected to the optical sensor.

Further, the overheating point detection device includes a light receiving probe provided in the housing for receiving visible light emitted from the overheating point, and a light receiving probe for transmitting the visible light received by the light receiving probe. An optical fiber is provided extending to the outside of the housing, and the optical fiber is characterized in that a means for visual inspection is provided at the end of the optical fiber.

In addition, whether the plurality of light receiving probes are mounted on a straight line in the radial direction facing one end surface of the rotor,
Alternatively, the V mark indicates that the rotor is attached so as to face one end surface of the rotor and cover the entire area thereof.

Alternatively, the light-receiving probe is installed so as to reciprocate in the radial direction of the rotor to cover the entire end face of the rotor with the help of rotational motion of the rotor, or the light-receiving probe is installed in an arch-shaped manner. It is characterized in that it is attached so as to cover the entire end surface of the rotor with the help of the rotary motion of the rotor by making a reciprocating motion while drawing the orbit of the rotor.

[Example 1 Examples will be described below with reference to the drawings.

FIG. 1 shows a case where a rotary regenerative heat exchange device with a superheat spot detection device according to the present invention is applied to heat exchange between boiler exhaust gas and boiler combustion air.

The boiler exhaust gas 1 enters into the rotor 2 of the rotary regenerative heat exchanger through the heating fluid inlet I. Inside the rotor 2, the boiler exhaust gas 1 is stripped of sensible heat by the heat transfer element 3. Rotor 2 is rotor drive! 11J device (not shown), the boiler exhaust gas 1
The heat is continuously transferred from the heat transfer element 3 to the heat transfer element 3. After the heat has been transferred, the boiler chamber 1 is discharged to the outside of the rotary regenerative heat exchange device through the heated fluid outlet duct.

In other words, the boiler combustion character 'A4 enters into the rotor 2 of the heat exchanger when the fluid to be heated is rotated from the heated fluid [1 guk 1], and there, the heat transfer element 3 housed inside the rotor 2 is heated. Sensible heat is removed and the heated fluid is discharged to the outside of the rotary regenerative heat exchanger through the outlet log.

The above-mentioned boiler exhaust gas] contains soot and unburned fuel, so when they pass through the debris of the heat transfer element 3 housed inside the rotor 2, they are deposited on the surface of the heat transfer element 3. When the temperature of this deposit reaches the ignition point, it burns and forms a superheat spot.

If this overheating point is not detected, a rapid oxidation reaction of the metal heat transfer element 3 may eventually occur, causing a fire in the heat transfer element 3 and the rotor 2.

In order to prevent such situation 1), it is necessary to reliably detect overheating points. Therefore, in the rotary regenerative heat exchanger with superheat spot detection device jn according to the present invention, a light receiving probe 5 is provided near the low temperature side end face of the heated fluid 4IIll of the rotor 2 to receive infrared rays emitted from the superheat spot. It is being The main part of this light receiving probe 5 is composed of a microlens and an optical fiber.

The infrared rays collected by the light receiving probe 5 are transmitted through an optical fiber 6 which is connected to the light receiving probe 5 and extended to the outside of the housing.

This transmission optical fiber 6 is protected by a flexible tube 7 made of stainless steel. As for the fiber 6,
A heptadide infrared fiber suitable for infrared transmission is used. This is possible because quartz fibers are used for this purpose.

A transmission optical fiber 6 is connected to a light sensor 7 outside the housing. Since this connection is made via an optical connector, the fiber 6 can be easily attached and detached. The optical sensor 7 is installed in a favorable environment. The infrared rays that reach the sensor 7 are converted into electrical signals here. The center of the optical sensor is P I) S'f
It is composed of detection elements such as PbSe.

The electrical signal is A/D converted by an analysis device 8 connected to the optical sensor 7 and an image display wave a9, and then converted into temperature information by a microprocessor sensor, and then displayed as an image. It has 11 functions since it is designed to issue an alarm based on the information from the analysis device.

By separately providing a light receiving probe 5, connecting an optical fiber 10 for visible light to it, and connecting an eyepiece 11 to the optical fiber extended to the outside of the housing, the overheating point can be directly connected to the housing. It is possible to visually observe from the outside. In this case, quartz 7-eye glass is used as the fiber 10.

FIGS. 2 and 3 show various examples of arrangement of the light receiving probes 5 in the rotary regenerative heat exchanger equipped with an overheating point detection device according to the present invention.

First, in the arrangement example on the right side of FIG. #IJ2, a plurality of light receiving probes 5 are arranged in a line in the radial direction facing the end surface on the low temperature side of the rotor 2. With this arrangement, the entire end face of the rotor 2 is covered with the aid of the rotational movement of the rotor 2.

The arrangement example on the left side of FIG. 2 shows a case where multi-point detection is performed.

By installing a large number of light receiving probes in this manner, it is possible to monitor the entire end surface of the rotor even when the rotational movement of the rotor is stopped.

In the arrangement example on the right side of FIG. 3, it is also possible to cover the entire end surface of the rotor 2 by using a single light receiving probe 5 and reciprocating it linearly in the radial direction of the rotor 2. With the aid of the rotational movement of the rotor 2, the entire area of the end face of the rotor 2 is monitored by this mechanism.

In the arrangement example on the left side of the figure, it is also possible to cover the entire end surface of the rotor 2 by moving the light receiving probe 5 back in an arched manner. With the aid of the rotational movement of the rotor 2, the entire area of the end face of the rotor 2 is also monitored by this mechanism.

[Effect of the Invention 1] The present invention has made it possible to install an optical sensor outside the rotary regenerative heat exchanger n. As a result, they were able to stabilize the sensor sensitivity by placing the sensor in a favorable environment, and were able to significantly improve detection accuracy.

This eliminates the need for a cooling device for the optical sensor, which was required in the Vt method. According to the present invention, it has become possible to install the light receiving probe on the high temperature side end face of the rotor. The maintenance work for the sensor has become extremely easy due to the above-described installation method. It is possible to perform maintenance work on the optical sensor even while the rotary regenerative heat exchanger is in operation.

Furthermore, the present invention solves the problem of securing installation space for the optical sensor.

By using optical fiber for visible light, it has become possible to directly observe the inside of the rotor of a rotary regenerative heat exchanger. This direct visual observation can also be used in conjunction with image display.

Since the size of the light-receiving probe is small, it is easy to adopt a multi-point detection method, and the lens portion of the light-receiving probe can be sufficiently cleaned by using a small-diameter air nozzle.

[Brief explanation of drawings]

tIS1 is a schematic explanatory diagram showing one embodiment of the present invention.
The figure and tpJ3 figure are explanatory diagrams showing examples of arrangement of light receiving probes. 1... Boiler exhaust gas 2... Rotor, 3... Heat transfer element, 4... Boiler combustion air, 5... Light receiving probe, 6... Optical fiber, 7... Optical sensor, 8 ...Analysis device, 9...Image display device, 10...
・Optical fiber 11...eyepiece

Claims (1)

[Claims] 1. A central axis, a rotor rotating around the central axis,
a heat transfer element housed inside the rotor; a hot spot detection device for detecting a hot spot inside the rotor;
A superheating point detection device comprising a housing housing a rotor having an inlet and an outlet duct for heating fluid and heated fluid, and exchanging heat between the heating fluid and the heated fluid by rotating the rotor. In the rotary regenerative heat exchanger, the superheating point detection device includes a light receiving probe provided in the housing for receiving infrared rays emitted from the superheating point, and a light receiving probe for transmitting the infrared rays received by the light receiving probe. Consisting of an optical fiber extending from the light receiving probe to the outside of the housing, and an optical sensor connected to the terminal end of the optical fiber for receiving infrared rays transmitted by the optical fiber and converting it into an electrical signal. A rotary regenerative heat exchange device with an overheating point detection device, characterized in that the optical sensor is connected to means for analyzing and displaying an image of an electric signal transmitted from the optical sensor. 2. A central axis and a rotor that rotates around the central axis;
a heat transfer element housed inside the rotor; a hot spot detection device for detecting a hot spot inside the rotor;
A superheating point detection device comprising a housing housing a rotor having an inlet and an outlet duct for heating fluid and heated fluid, and exchanging heat between the heating fluid and the heated fluid by rotating the rotor. In the rotary regenerative heat exchanger, the superheating point detection device includes a light receiving probe provided in the housing for receiving infrared rays emitted from the superheating point, and a light receiving probe for transmitting the infrared rays received by the light receiving probe. Consisting of an optical fiber extending from the light receiving probe to the outside of the housing, and an optical sensor connected to the terminal end of the optical fiber for receiving infrared rays transmitted by the optical fiber and converting it into an electrical signal. A rotary regenerative heat exchange apparatus with a superheat point detection device, characterized in that the optical sensor is connected to a means for analyzing an electric signal transmitted from the optical sensor and issuing an alarm. 3. a central axis and a rotor rotating around the central axis;
a heat transfer element housed inside the rotor; a hot spot detection device for detecting a hot spot inside the rotor;
A superheating point detection device comprising a housing housing a rotor having an inlet and an outlet duct for heating fluid and heated fluid, and exchanging heat between the heating fluid and the heated fluid by rotating the rotor. In the rotary regenerative heat exchange device, the superheat point detection device includes a light receiving probe provided in the housing for receiving visible light emitted from the superheating point, and a light receiving probe for transmitting the visible light received by the light receiving probe. an optical fiber extending from the light-receiving probe to the outside of the housing, and a means for visual inspection is provided at the end of the optical fiber. Rotary regenerative heat exchange equipment. 4. In the rotary regenerative heat exchanger equipped with an overheating point detection device according to any one of claims 1 to 3 above, a plurality of light receiving probes are installed facing one end surface of the rotor in a straight line in the radial direction thereof. A rotary regenerative heat exchange device with an overheating point detection device. 5. In the rotary regenerative heat exchanger equipped with an overheating point detection device according to any one of claims 1 to 3, a plurality of light receiving probes are attached to face one end surface of the rotor so as to cover the entire area thereof. A rotary regenerative heat exchange device with an overheating point detection device. 6. In the rotary regenerative heat exchanger with an overheating point detection device according to any one of claims 1 to 3, the light receiving probe reciprocates in the radial direction of the rotor, so that the end face of the rotor is assisted by the rotational movement of the rotor. A rotary regenerative heat exchange device equipped with a superheat point detection device, characterized in that it is installed so as to cover the entire area of the area. 7. In the rotary regenerative heat exchanger with an overheating point detection device according to any one of claims 1 to 3 above, the light receiving probe reciprocates in an arched trajectory and is assisted by the rotational movement of the rotor. A rotary regenerative heat exchange device with a superheat point detection device, characterized in that it is installed so as to cover the entire end face of a rotor.