JPH07280245A - Treating facility for burnt ash - Google Patents

Abstract

PURPOSE:To prevent adherence of ash to a tube and clogging of the tube due to condensation of water caused by a decrease in a tube wall temperature of a tube for conveying ash in a treating facility for pneumatically conveying burnt ash of a high temperature. CONSTITUTION:A thermometer 7 for measuring a tube wall temperature of a tube 3 is provided at an outlet side of the tube 3 not heat insulated to pneumatically convey burnt ash of a high temperature. A temperature signal measured by the thermometer 7 is input to an ON-OFF valve 8 provided in a steam tube 9 to a steam air heater 6 for heating conveying air flowing in the tube 3 to control the heater 6 via the valve 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion ash treatment facility adapted to convey high temperature combustion ash by air.

[0002]

2. Description of the Related Art High-temperature combustion ash (800 ° C. to 450 ° C.) from an orimulsion-fired boiler, a fluidized-bed boiler, etc. is conveyed from the hopper to a bag filter by the combustion gas and the air for conveyance through the pipe, and the pipe during the conveyance is conveyed. An example of a conventional ash processing facility that cools by heat dissipation is shown in FIG. As shown in FIG. 2, the high temperature combustion ash is discharged from a plurality of hoppers 1 by a valve 2 on / off operation along with the combustion gas for a certain time into a pipe 3 which is not kept warm for transportation. The exhausted combustion ash is mixed with air sucked into the pipe 3 from the atmosphere by the vacuum pump 4 connected to the pipe 3,
Approximately 150 ° C by releasing heat to the atmosphere during transportation inside
After being cooled to, it is discharged to the bag filter 5.

In the operation of this ash processing facility, as shown in FIG. 3, ash discharging for a fixed time and cooling of the pipe by air are alternately performed. Also, when the ash processing equipment is started, the pipe is at the atmospheric temperature and the dew point temperature of the moisture in the transport air, so the ash is prevented from adhering to the pipe due to the condensation of water during ash transportation. In order to do this, the steam air heater 6
After raising the temperature of the pipe to above the dew point by flowing warm air through The steam air heater 6 is used only during start-up and is not used during ash payout.

[0004]

In the above-mentioned conventional ash processing equipment, the ash cooling temperature is determined by the atmospheric temperature, the heat transfer coefficient around the pipe (varies depending on the wind), and the pipe temperature (air flowing time). The ash outlet temperature fluctuates due to changes in atmospheric temperature and wind.

Particularly in winter, the pipe wall of the pipe may be below the dew point temperature of the moisture, and water may condense to cause ash adhesion and blockage of the pipe. Although the ash is started to be discharged in a state of being above the dew point, it cannot be controlled to keep the inner wall temperature above the dew point temperature of moisture against changes in temperature and changes in wind speed.

That is, when the steam air heater is used during start-up and the heating by the steam air heater is not performed at the time of discharging the combustion ash, as shown in FIG. The temperature of the inner wall of the pipe may be gradually decreased during transportation, and may be below the dew point temperature of moisture in the transportation air.

The present invention is intended to provide an ash processing facility capable of solving the above problems.

[0008]

DISCLOSURE OF THE INVENTION Combustion ash treatment equipment of the present invention comprises a pipe which is not kept warm for carrying high temperature combustion ash by air, a heater for heating carrier air flowing in the pipe,
A thermometer provided at the outlet of the pipe for measuring the temperature of the pipe wall of the pipe, and means for controlling the heater by receiving the temperature signal measured by the thermometer are provided.

[0009]

According to the present invention, the temperature of the pipe is measured at the outlet of the non-heat-insulated pipe that carries the hot combustion ash by air, and the measured temperature signal is input to the control means to control the heater. Therefore, it is possible to prevent the temperature of the pipe wall of the pipe from being lowered to the dew point temperature of the moisture in the transport air.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. This embodiment is of the same type as the apparatus for treating combustion ash shown in FIG. 2. In FIG. 1, the same parts as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, a pipe wall thermometer 7 for measuring the pipe wall temperature of the pipe 3 is provided on the inlet side of the bag filter 5, which is the outlet of the pipe 3, and a steam for heating the steam air heater 6 is provided. An on / off valve 8 is provided in the steam pipe 9 for supplying the gas, and the temperature signal measured by the pipe wall thermometer 7 is turned on / off.
The ON / OFF valve 8 is controlled by being input to the OFF valve 8.

In the present embodiment, as shown in FIG. 4, the temperature of the inner wall of the pipe 3 which is not kept warm may be lower than the dew point temperature of the moisture in the carrier air during operation. A signal of the temperature measured by the thermometer 7 is input to the on / off valve 8, and the on / off valve 8 is controlled before the measured temperature falls below the dew point temperature, and the on / off valve 8 is opened. The steam is supplied to the steam air heater 6 to raise the temperature of the carrier air flowing in the pipe 3 and prevent the temperature of the inner wall of the pipe 3 from lowering to prevent the temperature from becoming lower than the dew point temperature. Therefore, the temperature of the inner wall of the pipe 3 does not decrease and the water does not condense, and it is possible to prevent the adherence of the combustion ash to the pipe 3 and the resulting clogging of the pipe 3. Further, in the present embodiment, since water does not condense in the pipe 3 as described above, it is not necessary to change the set operation pattern, and the pipe 3 due to changes in atmospheric temperature and atmospheric flow. The temperature fluctuation can be dealt with only by operating the on / off valve 8 as described above.

[0013]

INDUSTRIAL APPLICABILITY According to the present invention, a temperature signal of a thermometer for measuring the temperature of the pipe wall of a pipe provided at the outlet of an unheated pipe for conveying high-temperature combustion ash by air is used to convey the ash in the pipe. Since the heater that heats the air is controlled, the temperature of the pipe wall of the pipe is kept above the dew point temperature of the moisture in the transport air to prevent the combustion ash from adhering to the pipe and blocking the pipe. You can

Further, when the temperature of the pipe is kept in order to keep the temperature of the pipe above the dew point of the moisture in the carrier air, the length of the pipe becomes long, and hot water above the dew point is piped around the pipe. However, in the present invention, the temperature of the pipe wall of the pipe is changed to the dew point of the moisture content in the carrier air only by adding a means for controlling the thermometer and the heater. It is possible to maintain the temperature above the temperature, and there is no need to enlarge the entire equipment.

[Brief description of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention.

FIG. 2 is a system diagram of a conventional combustion ash treatment facility.

FIG. 3 is an operation pattern diagram of the conventional combustion ash treatment facility.

FIG. 4 is a graph showing a pipe inner wall temperature of the conventional combustion ash treatment facility.

[Explanation of symbols]

 1 Hopper 2 Valve 3 Piping 4 Vacuum Pump 5 Bag Filter 6 Steam Air Heater 7 Pipe Wall Thermometer 8 On / Off Valve 9 Steam Piping

[Procedure amendment]

[Submission date] November 30, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (1)

[Claims] 1. A non-heat-maintaining pipe for conveying high-temperature combustion ash by air, a heater for heating conveying air flowing in the pipe, and a thermometer provided at an outlet of the pipe for measuring a pipe wall temperature of the pipe. And a means for controlling the heater to which the temperature signal measured by the thermometer is input, the combustion ash treatment facility.