JPS59176513A - Slurry fuel feeding device - Google Patents

Abstract

PURPOSE:To enable safe and reliable supply of slurry fuel to a combustion device, by a method wherein, in case combustion is brought to an emergency or an ordinary stop, a heating source at a fuel heater is brought to a stop, and simultaneously, slurry fuel in the heater is cooled by a cooling means. CONSTITUTION:A heater 5 is provided with a cooling means 15 comprising a piping 13, including a cooling water valve 12, which has one end connected to a heating coil 60 and the other end connected to a cooling water source 14. A controller 16 has a circuit which is constituted such that it provides a signal, by means of which a heating source 6 is brought to a stop when combustion of a fuel device 7 is stopped by means of an emergency stop signal 17 or a stop signal 18 provided in the case of an ordinary operation, namely a signal 100 in response to which a steam valve 63 is closed, and provides a signal 102 for driving the cooling means 15, namely a signal, by means of which a cooling water valve 12 is opened and which controls slurry fuel so that it can be cooled for a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel supply device for a boiler device, and more particularly to a slurry fuel supply device suitable for safely and reliably supplying slurry fuel to a combustion device of the boiler device. .

A conventional slurry fuel supply device of this kind is equipped with a heating source to supply slurry fuel, which is made by turning pulverized coal into a slurry with a liquid such as water, oil, or organic liquid, so that it can be handled in the same way as liquid fuel. It is configured to heat the fuel using a fuel heater and then supply it to the combustion device.

According to the slurry fuel supply device configured in this way,
The slurry fuel is heated in the heater and supplied to the combustion device of the boiler device. The combustion device combusts the supplied slurry fuel. In such a slurry fuel supply device, the reason for heating the slurry fuel is as follows.
This is to improve combustion in the combustion device by reducing the viscosity of the slurry fuel and improving atomization.

By the way, according to the conventional slurry IJ-e fuel supply device as described above, since the temperature of the slurry fuel in the solvent heater is high and the viscosity of the slurry fuel is low,
It is known that solid matter (dove pack), which is produced by settling of pulverized coal in the slurry fuel, is generated at the bottom of the fuel heater. However, if the fuel heater or the like is used for a long time, the hard pack will eventually grow and the fuel heater will eventually become clogged.

Additionally, in general, in the outlet piping of the fuel heater in the slurry fuel supply system, the slurry fuel is heated to a high temperature as in the heater, so its viscosity decreases, and as a result, as mentioned above, A hard pack occurs. Therefore, the conventional slurry fuel supply apparatus has the disadvantage that the outlet pipe may also become clogged.

Furthermore, according to the conventional slurry fuel supply device, a portion of the hard pack generated in the fuel heater and the outlet pipe is supplied to the fuel spray nozzle of the combustion device, thereby clogging the fuel spray nozzle. The drawback was that it made it easier to use.

SUMMARY OF THE INVENTION An object of the present invention is to provide a slurry fuel supply device that eliminates the drawbacks of the prior art described above and can safely and reliably supply slurry fuel to a combustion device.

In order to achieve the above-mentioned object, the present invention, when stopping combustion in an emergency or normally, ・stops the heating source in the silent fuel heater and cools the slurry fuel in the fuel heater using a cooling means. It is characterized by the following.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings, but before that, the matters on which the present invention is based will be explained.

FIG. 1 is a characteristic diagram showing the relationship between slurry fuel temperature and slurry fuel viscosity. As is clear from the figure, by increasing the slurry fuel temperature, the viscosity of the slurry fuel decreases. The advantage of reducing the slurry fuel viscosity is that, as mentioned above, the atomization characteristics of the spray from the spray nozzle are improved, which is effective in improving combustion efficiency.

On the other hand, as mentioned above, the disadvantage caused by the drop in slurry fuel viscosity is that pulverized coal settles and hard pack is generated in the heater and its outlet piping.
The problem is that the pipes and spray nozzles become clogged, and the supply of slurry fuel is interrupted. Therefore, it is necessary to lower the temperature of the slurry fuel in the fuel heater and the outlet side piping of the heater as soon as possible immediately before or after the boiler device trips or stops. An object of the present invention is to provide an apparatus that can cool slurry fuel in a short time as described above. An example thereof will be described below.

FIG. 2 is a system diagram showing an embodiment of the slurry fuel supply device according to the present invention.

In the embodiment shown in FIG. 1, reference numeral 1 is a tank for storing slurry fuel, and the bottom of this tank 1 is connected to the suction port of a pump 3 via a main valve 2. In the embodiment shown in FIG. The pump 3 has a discharge port connected to a fuel heater 5 via a pump outlet valve 4, and supplies the slurry fuel to the fuel heater 5.
We are currently preparing to supply the following items. The fuel heater 5 is equipped with a heating source 6 and can supply slurry fuel heated by the heating source 6 to the combustion device 7. The heating source 6 includes a heating coil 60 provided in the heater 5, and a steam flow rate flowing through the heating coil 60 from a tlATh device 62 which receives a detection signal from a temperature detector 61. It is comprised of a means adapted to be adjusted by a steam valve 63 that opens and closes in response to an output signal.

In the combustion device 7, a spray nozzle 71 is connected to the outlet side of the heater 5 via a spray nozzle main valve 70, and atomized steam 72 is taken into the spray nozzle 71 via a steam valve 73 to produce slurry fuel. Spout! (74)

One end of a return pipe 9 equipped with a return valve 8 is connected to the outlet side of the heater 5, and the other end of the return pipe 9 is connected to the outlet side of the heater 5.
It is connected to the suction port of the pump 3 via a pump return valve 10 and to the tank 1 via a tank return valve 11.

The heater 5 is provided with a cooling means 15 in which one end of a piping 13 equipped with a cooling water valve 12 is connected to a heating coil 60, and the other end is connected to a pressurized cooling water source 14.

Further, reference numeral 16 denotes a control device, and the control device 16 controls the heating source when stopping combustion in the combustion device 7 by an emergency stop signal 17 or (6) a stop signal 18 in the case of normal operation. 6, i.e. steam valve 63
The circuit is configured to generate a signal 100 for closing the cooling means 15 and a signal 102 for driving the cooling means 15, that is, a signal for opening the cooling water valve 12 and controlling the slurry fuel so that it can be cooled in a short time. . moreover,
At this time, the control device 16 has a circuit configuration that outputs a control signal 104 that closes the pump return valve 10 and a control signal 106 that opens the tank return valve 11.

The operation of the slurry fuel supply system configured as described above will be explained below.

The slurry fuel in the tank 1 flows through the main valve 2 to the pump 3.
is pressurized. The slurry fuel pressurized by the pump 3 passes through the pump outlet valve 4 and is then heated by the fuel heater 5 to reduce its viscosity.
It is supplied to the 0-p spray nozzle 71. The slurry fuel supplied to the spray nozzle 71 takes in atomized steam 72 for expanding it through an atomized steam valve 73, and is injected into the furnace by the action of this and the spray nozzle 71 (74). It turns out.

In the fuel heater 5, after the heating steam 64 for heating the slurry fuel is adjusted in flow rate by the fire detector 60XqQ device 62 and the heating steam valve 63, it is supplied to the heating coil 61, and after heating the slurry fuel, It becomes a drain 19 and is drained to the outside.

The flow rate of the heated steam 64 is adjusted by the regulator 62 adjusting the steam valve 63 based on the detection signal of the outlet temperature detector 61 installed at the outlet of the fuel heater 5. .

A portion of the slurry fuel at the outlet of the heater 5 is returned to the return pipe 9 via the slurry fuel return valve 8 . During normal operation, this slurry fuel is returned to the pump return valve 1.
0 and is returned to the inlet of the CWM pump 3. When the boiler equipment trips (occurrence of the emergency stop signal 17) or just before stopping during normal operation, the pump return valve 10 is closed and the return portion of the slurry fuel is transferred to the tank return valve 1.
Since 1 is forced to open, it will be returned to tank 1.

Furthermore, according to the present embodiment, when the boiler device trips or immediately before or after stopping normal operation, the heating steam valve 63 is closed and the cooling water valve 12 is opened, so that the heating coil 6
By flowing cooling water through the fuel heater 5, the slurry fuel in the fuel heater 5 is rapidly cooled. Further, the heated slurry fuel in the pipe is returned to the tank 1 having a large heat capacity by opening the tank return valve 10.

The temperature of the heating steam 64 is desirably below the saturation temperature of the slurry liquid corresponding to the pressure within the fuel heater 5. The reason for this is to prevent local external boiling within the fuel heater 5 and to prevent a sudden increase in the viscosity of the slurry fuel.

In this embodiment, the heating coil 61 is also used as part of the cooling means, but of course it may be provided separately. That is, the cooling coil may be provided in the fuel heater 5 separately from the heating coil 61 (9).

According to this embodiment, it is possible to prevent the generation of hard back in the fuel heater 5, and it is possible to eliminate blockage accidents caused by hard back.

According to this embodiment, by returning the low-viscosity slurry fuel in the outlet side piping of the fuel heater 5 to the tank 1, the slurry fuel in the piping can be rapidly cooled, thereby preventing clogging of the piping due to hardback. It is something that can be done.

As described above in detail, according to the present invention, since the slurry fuel is cooled when combustion is stopped, the slurry fuel can be safely and reliably supplied to the combustion device.

[Brief explanation of the drawing]

FIG. 1 is a characteristic diagram showing the relationship between slurry fuel temperature and slurry fuel viscosity, and FIG. 2 is a system diagram showing an embodiment of the slurry fuel supply device according to the present invention. 1...Tank, 3...Pump, 5...Fuel heater. 6... Heat source, 7... Combustion device, 12...
・Cooling water valve. (10) 14... Cooling water source, 15... Cooling means, 1
6...Control device. Agent Tatsuyuki Unuma (11) BINKI-Machio Kanne

Claims (1)

[Claims] (1) In a slurry fuel supply device that heats slurry fuel with a fuel heater equipped with a heating source and then supplies the slurry fuel to a combustion device, the fuel heater is provided with a cooling means, and combustion in the combustion device is stopped. In this case, the slurry fuel supply device is characterized in that it is constructed by providing a control means for controlling the heating in the fuel heater to stop and for controlling the slurry fuel to be cooled by the cooling means.