JPH0544915A - Device of monitoring accumulated matter in hopper - Google Patents

Abstract

PURPOSE:To provide a device to monitor an abnormality in the level of accumulated matters and abnormal heat generation in them accumulated in a hopper for collecting and discharging the ash and unburned matters contained in the exhaust gas of a boiler. CONSTITUTION:A plurality of thermocouples 7 are installed in the hopper 1 in the longitudinal direction with a specified distance among them to detect the temperature of the exhaust gas or of accumulated matters 4 in the hopper 1. Respective detected temperatures are compared mutually in a calculator 9. The level of the accumulated matters is known by the temperature difference developed between adjacent thermocouples, and when high temperature is indicated in a buried thermocouple 7, it is judged that an abnormal heat generation has occurred in the accumulated matters 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hopper deposit monitor applied to a hopper provided in a boiler exhaust gas system, and more particularly to a device for monitoring abnormal heat generation and abnormal deposit of hopper deposits.

[0002]

2. Description of the Related Art A hopper provided in a boiler exhaust gas system collects and discharges ash and unburned fuel contained in exhaust gas. A deposit discharge valve is provided at the bottom of the hopper, and the discharge valve is opened by vacuuming at predetermined intervals to discharge the deposit.

[0003]

As described above, in the conventional hopper, the deposit is discharged from the hopper at regular intervals. However, the discharge valve does not open due to the malfunction of vacuuming, and the deposit accumulates. Also, in the state where the normal exhaust valve is closed, air may leak due to the malfunction of the sealing property, or heat may accumulate in the deposits, and in some cases the deposits may melt and burn the hopper. is there. The present invention is
It is an object of the present invention to provide an apparatus capable of monitoring deposits in the hopper and preventing abnormal deposits and abnormal heat generation in advance.

[0004]

To solve the above problems, according to the present invention, a plurality of temperature measuring means provided in the hopper provided in the boiler exhaust gas system at intervals in the vertical direction, and these temperature measuring means. There is provided a deposit monitoring device in a hopper, which is provided with a computing device that performs a comparative calculation of a temperature measurement signal from a warming unit to detect heat generation of a deposit in the hopper and monitor a level of the deposit.

[0005]

According to the above means, the temperature measurement data sampled in the hopper at appropriate intervals in the vertical direction are monitored. The temperature measuring means at the level where there is no sediment in the hopper shows a high temperature because it is exposed to the hot exhaust gas, and the temperature measuring means buried by the sediment shows a low temperature.
The temperature difference indicates the deposition level of the deposit. Also,
It can be seen that the deposit is partially exothermic if some of the lower temperature levels show higher temperatures. When the deposit level of the deposit is equal to or higher than a specified level or when the heat generation is abnormally generated, the arithmetic unit issues an alarm, prompts the manual discharge of the deposit, or automatically or manually operates the fire extinguishing equipment.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the construction of a deposit monitoring device in a hopper according to the present invention. In the drawing, reference numeral 1 is a hopper provided in a boiler exhaust gas system, and 2 is a discharge provided at the bottom of the hopper 1. Valve 3, discharge pipe 4 and deposits in the hopper. 5 is a ceramic pipe having a low thermal conductivity, 6 is a pipe for mounting the ceramic pipe 5 in a hopper, 7 is a thermocouple mounted on the ceramic pipe 5, 8 is a compensating lead wire, 9 is a computing unit, 10 is a fire extinguisher. Equipment, 11 is a drainage hole.

At the center of the hopper 1, a ceramics pipe 5 is vertically attached to an attachment pipe 6 by winding it with, for example, a stainless wire. A plurality of thermocouples 7 are attached to the ceramic pipe 5 at a certain interval in the vertical direction. The temperature measurement signal of each thermocouple 7 is input to the arithmetic unit 9 via a compensation lead wire. The arithmetic unit 9 performs a comparative arithmetic process on each temperature measurement signal to determine whether there is an abnormality,
It is composed of a part that issues an alarm when an abnormality occurs.

High-temperature exhaust gas is introduced into the hopper 1 provided in the boiler exhaust gas system, and the temperature is generally 250 ° C to 450 ° C, although it varies depending on the load conditions of the boiler and the installation position of the hopper 1. Therefore, the gas atmosphere in the hopper is also 250 ° C. to 450 ° C.
The thermocouple 7, which is not buried by and is exposed to the gas atmosphere, outputs a signal indicating the high exhaust gas temperature.

Since the ceramic pipe 5 to which the thermocouple 7 is attached is made of a material having a low thermal conductivity, the temperature at the adjacent thermocouple position is not transmitted, so that each thermocouple 7 can accurately determine the temperature at that level. Can be detected.

The ash and unburned fuel which are deposits are stored in the hopper 1.
When deposited inside, the temperature of the deposit 4 gradually decreases, so that the temperature of the thermocouple 7 buried in the deposit 4 also gradually decreases. Therefore, when a temperature difference occurs between the adjacent thermocouples 7, the thermocouples 7 that emit a low temperature signal
It can be known that the deposit 4 is deposited up to the level of. If the deposition level of the deposit 4 exceeds the prescribed level, the arithmetic unit 9 determines that the deposition level is abnormal and issues an alarm. In response to this, the unit is stopped, the discharge valve 2 is opened, and the deposit is discharged. In this case, it is conceivable that the discharge valve 2 did not open due to a vacuuming failure, so that the inspection of the equipment related thereto is also performed at the same time.

Further, a specific thermocouple 7 buried in the deposit 4
When the temperature rises and exceeds the temperature set value,
Judging that the deposit 4 in the vicinity generated heat and melted,
At the same time as the alarm is issued, the unit is stopped, and preferably, the digestion equipment 10 installed automatically above the hopper 1 is used.
Is operated to inject fire extinguishing water into the hopper 1 to extinguish the deposit 4 which is abnormally generating heat. The digested water is discharged through a drain hole 11 provided at the bottom of the hopper 1. in this case,
It is conceivable that air leaked into the hopper 1 due to improper sealing of the discharge valve 2 and unburned fuel burned to generate heat, so the discharge valve 2 must also be inspected.

The arithmetic unit 9 detects the deposition level and judges the occurrence of abnormal heat generation by comparing the temperature measurement signals with each other or with the temperature set value, and should be implemented by an appropriate microprocessor. You can

The above-described embodiment is an example in which the thermocouple 7 is attached to the ceramic pipe 5 installed in the center of the hopper, but as another embodiment, an elongated ceramic plate is installed on the inner surface of the hopper plate of the hopper 1, and You may make it attach the thermocouple 7 in the inclination vertical direction of the inner surface of a ceramic plate.

[0014]

According to the present invention, the temperature and the deposition level of the deposits in the hopper can be monitored to detect abnormalities of them early and surely. Means for removing the cause of the abnormality can be taken.

[Brief description of drawings]

FIG. 1 is a system diagram showing a configuration example of a deposit monitoring device in a hopper according to the present invention.

[Explanation of symbols]

 1 Hopper 2 Discharge valve 3 Discharge pipe 4 Deposit 5 Ceramics pipe 6 Mounting pipe 7 Thermocouple 8 Compensation lead wire 9 Computing device 10 Extinguishing facility 11 Drainage hole

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hironori Ishii 1-1 1-1 Atsunoura-machi, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries, Ltd. Nagasaki Shipyard Co., Ltd.

Claims (1)

[Claims] 1. A plurality of temperature measuring means provided in a hopper provided in a boiler exhaust gas system at intervals in the vertical direction,
A deposit monitoring device in a hopper, comprising: a computing device that compares and calculates temperature measurement signals from these temperature measuring means to detect heat generation of a deposit in the hopper and monitor a level of the deposit.