JPS63279095A - Thermal accumulator's temperature detector device in a rotary regenerative heat exchanger - Google Patents

Abstract

PURPOSE:To transmit a temperature of each of locations in a thermal accumulator out of a heat exchanger to accept an accurate position and a temperature of each of the locations by a method wherein an electromagnetic induction phenomenon is utilized as means for transmitting an electrical power between a rotary part and a fixed part of a heat exchanger and a phenomenon of transmitting an electromagnetic wave under a modulation of a frequency is utilized as means for transmitting an electrical signal. CONSTITUTION:AC supplied by an external AC power supply 1 is converted into a high frequency by an AC-DC converter 3 and an induction power oscillator 6 and then applied to an induction power transmittance coil 11. A high frequency magnetic field generated by the coil 11 is received by an induction power receiving coil 17 to generate a high frequency voltage, converted into a DC current by an AC-DC converter 18 and then supplied to a frequency modulator 19 and an electronic automatic converter 20 as a power for a power supply. A temperature of each of the locations at each of layers of a rotary thermal accumulative body 7 may transmit an electromotive force generated by a thermocouple 24 to the electronic automatic converter 20 through an annular part of the acceptor ring 25 and time shared. This time shared signal is modulated by the frequency modulator 19, transmitted to a transmitting antenna 32 to generate an electric wave. The wave is received by a receiving antenna 33 and demodulated by a receiver 4 into a DC current and then it is displayed by a display unit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a device for detecting the temperature state of a heat storage body of a rotary regenerative heat exchanger in which the heat storage body rotates outside the heat exchanger. It is something.

As a device for detecting the temperature state inside the heat storage body of a rotary regenerative heat exchanger in which the heat storage body rotates at a fixed position outside the heat exchanger, the device is installed between the rotating part and the fixed part of the heat exchanger. There are two types of detection devices: a mechanical detection device that uses a slip ring and a brush installed on the body, and an optical detection device that uses a receiver in a fixed portion to receive infrared rays emitted from a rotating portion.

1. A heat exchanger that is continuously operated using so-called gooty gas as a heat exchange fluid, which contains a large amount of dust, corrosive substances, etc. discharged from combustion equipment, and In a heat exchanger whose operation is frequently stopped while using the heat exchanger, the flow path of the heat storage body of the heat exchanger through which the heat exchange fluid passes,
Accumulation of dust, acidic ammonium sulfate, generation of acid, accumulation of soot, etc. can easily cause clogging of the heat storage element, corrosion, fire, etc. In order to prevent this, soot blowing, water washing fire detection, and adjustments to operating specifications should be taken.
However, in order to take these measures under optimal conditions, it is necessary to know the exact location and temperature of each local part of the heat storage body.

In the slip ring/brush method, loss due to contact electrical resistance between the slip ring and the brush is added to the electrical signal that transmits temperature information inside the heat storage body, and the signal transmitted to the outside does not transmit temperature information of the heat storage body. It cannot be shown accurately and also lacks mechanical durability. In the infrared receiving method, the receiving surface of the infrared rays becomes contaminated with dust, soot, etc. of the heat exchange fluid in a short period of time, and the amount of infrared rays emitted from the local area cannot be accurately received externally. Due to the nature of the heat storage, it is difficult to accurately identify from outside which part of the heat storage body the infrared rays are emitted from, and the emissivity of the heat storage body changes due to dust, etc., so it is difficult to accurately determine from the amount of infrared rays. It is also difficult to determine the temperature externally.

The present invention was made to solve these problems, and its purpose is to control the temperature at each local part of the heat storage body of a rotary regenerative heat exchanger in which the heat storage body rotates. By using the electromagnetic induction phenomenon as a power transmission means between the rotating part and the fixed part, and by using the radio wave transmission and reception phenomenon by frequency modulation as the electric signal transmission means, the thermal converter can be placed externally. By transmitting data to the heat exchanger's location, grasping the exact location and temperature of each local area, and appropriately utilizing the obtained temperature information in the design and operation of the heat exchanger, An object of the present invention is to provide a temperature detection device for a heat storage body in a rotary regenerative heat exchanger that can achieve long-term continuous operation and simplify maintenance.

[Structure of the invention] An AC/DC converter converts alternating current supplied by an external power source to direct current, converts this direct current into a high frequency voltage using an induction power oscillator, and converts this high frequency voltage into a rotating heat storage body. an inductive power transmission coil incorporated in a fixed insulating ring which surrounds the rotating column of a rotary regenerative heat exchanger and can be adjusted and moved in the axial direction of the rotating column on a guide WtWl mounted on the non-rotating part of the heat exchanger. A high frequency voltage is applied to the coil.

The high-frequency magnetic field generated by the induction power transmission coil is received by the induction power receiving coil built into the rotating insulating ring installed in contact with and fixed on the circumference of the rotating column, and the coil generates a high-frequency voltage, and the high-frequency magnetic field is The voltage is converted to direct current by an AC/DC converter built into the rotating insulated ring, and this direct current is supplied to a frequency modulator and an electronic automatic switch built into the rotating insulated ring as power for their respective power sources.

The electromotive force generated by thermocouples fixedly installed at multiple local locations of the heat storage body is transferred from the thermocouples to the rotating column at a position where the rotating column penetrates the housing part, and is fixed on the circumference of the rotating column and prevents fluid leakage. The electric signal of the electromotive force transmitted is transmitted to the electronic automatic switching device through the thermocouple or compensating wire led to the electronic automatic switching device through the retaining hole of the retaining ring, which also has a part of the function. is time-divided by an electronic automatic switching device, and this time-divided electrical signal is modulated with radio frequency by a frequency modulator and transmitted to a transmitting antenna built into a rotating insulated ring, which causes the antenna to transmit radio waves. .

The electrical signal of the electromotive force transmitted through the aforementioned thermocouple or compensation conductor may be directly transmitted to a plurality of frequency modulators instead of the electronic automatic switch. That is, instead of installing an electronic automatic switch, a frequency modulator corresponding to a plurality of thermocouples may be added. In this case, the electrical signal generated by the thermocouple will be transmitted to the respective frequency modulator corresponding to that thermocouple.

Radio waves generated from a transmitting antenna are received by a receiving antenna built into a fixed insulated ring, and a radio frequency current is generated in the antenna, and this radio frequency current is demodulated by a receiver supplied with alternating current power from the outside. Then, this demodulated signal is visualized or recorded as temperature by a display device supplied with AC power from an external power source.

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

Figure 1 is a cross-sectional view of a rotary regenerative heat exchanger with a rotating heat storage body, showing a device that extracts and displays temperature signals from thermocouples in a control panel installed at a fixed position outside the rotary regenerative heat exchanger. FIG. 12 is a system diagram of an electric circuit that detects the temperature inside the heat storage body.

AClooV Power from an external AC power supply 1 of 60 Hz is supplied to an AC/DC exchanger 3, a receiver 4, and a display 5 installed in a control panel 2.

The AC supplied from the external AC power supply 1 is converted into DC of DCIOV by the AC/DC converter 3, and this DC is sent to the control panel 2.
300 Vp by the inductive power oscillator 6 installed in
-pi A fixed insulating ring that converts this high frequency into a high frequency of 60 KHz and is installed close to the circumference of the rotating column 8 of the rotary regenerative heat exchanger in which the heat storage body 7 rotates and fixed to the mounting ring 9. The inductive power is applied to a power transmission coil 11 incorporated in the power supply coil 10 .

The mounting ring 9 is mounted in the axial direction of the rotating column 8 on a guide rod 14 fixed to the bearing outer body of a support bearing 13 that supports the other end of the rotating column 8 supported by a guide bearing 12 at one end. The gap 16 between the stationary insulating ring 10 and the rotating insulating ring 15, which can be moved and which can be attached to and cooperate with the mounting ring 9, can be adjusted.

A rotating insulating ring 15 is installed to contact and fix the high frequency magnetic field generated by the induced power transmission coil 11 on the circumference of the rotating column 8.
The induction power receiving filter 17 built in the coil 17 generates a high frequency voltage of 30 vp-pi 60 KHz, and this high frequency voltage is converted to DC5V by the AC/DC converter 18 built in the rotating insulating ring 15. The frequency modulator 19, which is formed integrally with the AC/DC converter 18 and is incorporated in the rotating insulating ring 15, and the AC/DC converter 18 are arranged separately and are connected to the rotating insulating ring. The electric power is supplied to the electronic automatic switching device 20 incorporated in the power source 15 as the electric power of each power source. It should be noted that the rotating insulating ring 1 can be used without supplying power from the outside of the heat exchanger, which uses the power given by electromagnetic induction from outside the heat exchanger as a power source.
It is also possible to replace the device with a means that uses direct current generated from a storage battery (not shown) installed as a power source in 5 as a power source.

High temperature layer 21, medium temperature layer 22, and low temperature layer 2 of the rotating heat storage body 7
In order to detect the rise in temperature of each local part of each layer in step 3/or the temperature of the heat exchange fluid that comes into contact with the local part, m
An electromotive force in units of V is transferred from the thermocouple 24 to the holding hole 26 formed in the annular part of the holding ring 25 in the axial direction of the rotating column 8.
A compensation conductor 27 led to the electronic automatic switching device 20 through
is transmitted to the electronic automatic switching device 20 through the electronic automatic switching device 20. The retaining ring 25 is located at a position where the rotating column 8 passes through a 7% housing 30 that surrounds the heat storage body 7 and forms flow paths for the high-temperature fluid 28 and the low-temperature fluid 29. (1) A backing device 31 installed on the housing side to prevent leakage from inside the housing to the outside.
and is fixedly installed on the circumference of the rotating column 8.

Each electromotive force signal transmitted from a plurality of thermocouples 24 is further time-divided by an electronic automatic switching device 20, and the plurality of time-divided electric signals are divided into 100 by a frequency modulator 19.
The signal is modulated with a MHz radio frequency and transmitted to a transmitting antenna 32 built into the rotating insulating ring 15, and the antenna 32 generates radio waves.

The radio waves generated by the transmitting antenna 32 are received by the receiving antenna 33 built into the fixed insulating ring 10, and the antenna 33 generates a radio frequency current of 100 MHz, which is transmitted by the receiver 4 to the DCO~2. This demodulated signal is visualized or recorded on the display 5.

Since power is transferred between the induction power transmission coil 11 and the induction power reception coil 17 by the electromagnetic induction phenomenon, both coils are installed as close as possible to each other in order to reduce power loss between them as much as possible. need to be done. Therefore, the fixed insulating ring 10 and the rotating insulating ring 15 need to be placed as close as possible. However, rotating column 8
Depending on the state of thermal expansion and contraction of xi by moving in the axial direction of 8.

Note that since radio waves are transmitted and received between the transmitting antenna 32 and the receiving antenna 33, the distance between the two antennas may be within several meters, and there is no particular savings.

In order to make the diameter of the fixed insulating ring 10 and the rotating insulating ring 15 as small as possible, it is preferable to install the fixed insulating ring 10 and the rotating insulating ring 15 at a position where the diameter of the rotating part of the heat exchanger is as small as possible. 19 It is preferable that the upstream AC/DC exchanger 18 is installed in the lowest possible temperature range of the heat exchanger, considering the limits of heat resistance such as warpage.

Therefore, in this embodiment, since the high-temperature fluid 28 flows downward and the low-temperature fluid 29 flows upward, the lower rotating column 8 is on the low-temperature side, and the recirculating part on the low-temperature side is the part with the smallest diameter. Therefore, both rings are installed around the lower rotating column 8.

The control panel 2 incorporating the AC/DC converter 3, the induction power oscillator 6, the receiver 4, and the display 5 is also desired to be placed in a low temperature range as much as possible, so it is installed outside the low temperature side of the heat exchanger. .

[Effect of the invention 1] The temperature distribution of the rotating part of the heat exchanger and the temperature distribution of the high-temperature heat exchange fluid in contact with the part can be easily and accurately grasped at a fixed position outside the heat exchanger. By detecting temperatures such as these, it is possible to accurately determine the area where dust and acidic ammonium sulfate accumulate in the rotating heat storage body, the area where acid dew point occurs, the area where fire occurs due to combustion of accumulated soot, and the samurai where each phenomenon occurs.

In terms of statistics of the heat exchanger, the shape of the fluid flow path of the heat storage body and the material of the heat storage body can be appropriately selected depending on the installation position of the heat storage body.

During continuous operation of the heat exchanger, it is necessary to accurately control the preheating temperature by the steam preheater that preheats the low-temperature air that flows into the heat exchanger before heating, and to accurately control the uneven flow of high-temperature fluid inside the heat storage body. Be able to understand things, operate the soot blower properly, and be able to detect fire outbreaks early and prevent them.

Immediately after the operation of the heat exchanger is started and immediately before the operation is stopped, it is possible to accurately grasp the positional fluctuation status of the acid dew point generation area and the acidic ammonium sulfate accumulation area.

After the operation of the heat exchanger is stopped, the forced cooling time of the heat storage body required before washing the heat storage body with water and the drying time required after washing with water can be set to an appropriate minimum time.

In thermal preservation of the heat exchanger, each local part of the heat storage body can be accurately maintained at a temperature higher than the rusting temperature.

These design and operational effects reduce clogging of the heat storage element and the progression of corrosion, significantly extending the continuous operation period and life of the heat exchanger, thereby reducing operating costs. becomes.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a regenerative heat exchanger equipped with a heat storage body temperature detection device, and FIG. 2 is a system diagram of an electric circuit of the heat storage body temperature detection device. DESCRIPTION OF SYMBOLS 1... External AC power supply, 2... Control panel, 3... AC/DC converter, 4... Receiver, 5... Display, 6...
Inductive power oscillator, 7... Heat storage body, 8... Rotating column, 9
... Mounting ring, 10... Fixed insulating ring 1, 11... Inductive power transmission coil, 12... Guide bearing, 13... Support bearing, 14... Guide rod, 15... Rotation Insulating ring, 1
6... Gap, 17... Inductive power receiving coil, 18.
...AC/DC converter, 19...Frequency modulator, 20...
- Electronic automatic switch, 21... High temperature layer, 22... Medium temperature layer, 23... Low temperature layer, 24... Thermocouple, 25...
Retaining ring, 26... Holding hole, 27... Thermocouple or compensation lead wire, 28... High temperature fluid, 29... Low temperature fluid, 3
0...Hashing, 31...Backing device, 32
... transmitting antenna, 33... receiving antenna.

Claims (1)

[Claims] In a rotary regenerative heat exchanger in which a heat storage body that exchanges heat between a high temperature fluid and a low temperature fluid rotates around a rotating column, a plurality of thermocouples are installed in the fluid flow path of the heat storage body, and Thermocouples or compensating conductors are led to a plurality of frequency modulators through the holding holes of a holding ring fixed on the circumference of the rotating column at a position that penetrates the housing, and the above-mentioned plurality of conductive wires are guided to the rotating insulating ring fixed to the rotating column. A frequency modulator, an AC/DC converter, a transmitting antenna, and an inductive power receiving coil are incorporated, and a receiving antenna and an inductive power transmitting coil are incorporated in a fixed insulating ring installed at a fixed position outside the heat exchanger. A temperature detection device for a heat storage body, characterized in that a receiver, a display device, and an inductive power oscillator are installed outside the device.