JPS63146990A - Heating device for coal-oil mixture fuel - Google Patents

Abstract

PURPOSE:To make temperature of a coal-oil mixture fuel (COM) uniform from emergency stop to reoperation and completion of heavy oil replacement and keep the COM in a flowable state, by filling a liquid medium in a heater in the emergency stop of COM combustion device. CONSTITUTION:In emergency stop of a coal-oil mixture fuel (COM) combustion device, e.g. boiler, etc., a liquid heating medium, e.g. water, etc., is fed to fill the interior of a COM heater. Heating is carried out while controlling heating quantity of the liquid heating medium, e.g. output of an electric heater, etc., based on deviation of the flowable temperature of the COM and the detected temperature value of the COM using a heating means, e.g. heat transfer tubes, etc. Thereby the interior of the COM heater is kept at a temperature where the COM is flowable. Since the liquid heating medium is circulated by natural convection in the COM heater, the heating state for each heat transfer tube becomes uniform at all times.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a heating device for coal-oil mixed fuel (hereinafter referred to as COM), and in particular, to prevent clogging due to coagulation of COM and to ensure long-term continuous operation. The present invention relates to a heating device for COM such as a shell and tube type.

[Conventional technology]

Figure 2 shows a schematic diagram of the COM combustion boiler.

In FIG. 2, the COM stored in the C0M service tank 21 is pumped to the boiler 23 by the 00M pump
However, the C0M heater 2 installed on the way
4, the COM is heated to a viscosity suitable for spray twisting and baking in the boiler 23.

The heating source is usually the auxiliary steam header 2 of the boiler.
5 steam is used.

Furthermore, when the COM temperature drops, the COM solidifies and does not soften even when reheated, so when the boiler is shut down for a long period of time, the heavy oil tank 26 and the heavy oil pump 7 are used to replace heavy oil in the C0M system.

FIG. 3 is a system diagram of the COM heating device in the COM combustion system. In FIG. 3, COM enters inlet channel 29 by C0M supply line 28, passes through heat transfer tubes 30 to outlet chamber 31, and is supplied to the boiler by COM outlet line 32. On the other hand, the heated steam is supplied into the C0M heater shell 34 through the steam pipe 33, condenses by exchanging heat with the COM in the heat transfer tube 30, and is returned to the boiler via the condensed water return pipe 35.

In addition, the control system includes CO installed in the COM outlet piping 32.
Detecting the COM outlet temperature by the M outlet temperature detector 36,
Steam piping 33 based on the deviation between the detected value and the set COM temperature corresponding to the temperature when the COM is in a flowable state.
The opening degree of a supply steam regulating valve 37 installed in the steam pump is adjusted.

In addition, a well level detector 38 and a level adjustment valve 3 are also provided.
9, the heat exchanger tubes 30 in the C0M heater shell 34 are controlled so as not to be submerged in condensed water.

[Problem that the invention seeks to solve]

Trouble that generally occurs in C0M combustion equipment is C0M combustion equipment.
This is a blockage in the system due to 0M coagulation, and due to this, COM
must be constantly heated and kept fluid. In case, COM
The reality is that if it solidifies in the system, the only way to remove it is mechanically.

Therefore, when a boiler is intentionally shut down, a method is used in which the C0M system is replaced with heavy oil that can be reflowed by reheating. However, in the case of an emergency shutdown of the boiler due to an accident or the like, cooling proceeds while COM remains in the system.

In this case, the processing of the C0M system differs depending on whether the boiler is stopped for a long time or for a short time.

That is, in the case of a long-term shutdown of the boiler, unless the COM is replaced with heavy oil, the entire COM system will solidify and become unusable. Therefore, in this case, it is necessary to secure steam by backing up from another boiler or by starting an auxiliary boiler.

However, since the heavy oil system to be replaced is not constantly heated, it takes a considerable amount of time to replace the COM with the heavy oil, and by then the cooling and solidification of the COM has progressed. Furthermore, in the C0M heater, the tube located outside the tube handle cools more quickly than the tube located inside the tube handle. That is, temperature variations occur between the tubes that make up the tube handle.

This means that there is variation in the viscosity of COM in the tube, and when replacing COM with heavy oil, heavy oil replacement is carried out without any problems because COM with a low viscosity tends to flow easily in the tube where it remains. The heavy oil replacement process ends without replacing the heavy oil in the tube in which the highly viscous COM remains, and the residual COM solidifies in the tube.

The purpose of the present invention is to solve the above-mentioned problems of the prior art,
An object of the present invention is to provide a heating device for COM that can uniformize the temperature of COM in an 00M heater from an emergency stop to restart or completion of heavy oil replacement, and can keep the COM in a flowable state.

[Means for solving problems]

The above purpose is to supply a liquid heating medium such as water to the C0M heater to fill the heater during an emergency stop of a C0M combustion device such as a boiler, and to keep the liquid heating medium at a temperature higher than that at which the COM can flow. This is achieved by a configuration in which the heat is heated uniformly at any position on the outer periphery of the heat exchanger tube having the COM inside.

[Effect]

At the time of emergency shutdown of a COM combustion catalytic device such as a boiler, a liquid heating medium such as water is supplied into the 00M heater, and the 00M heater having a heat transfer tube is filled.

The liquid heating medium such as water in this 00M heater is heated by the heating means, and the liquid heating medium is heated based on the deviation between the set temperature of the COM corresponding to the COM temperature at which the COM can flow and the detected temperature value of the COM. The amount of heat that heats the heating medium, for example, the output of an electric heater, etc., is controlled, and the liquid heating medium such as water in the 00M heater is maintained at a temperature that allows COM to flow.

A liquid medium is used as a heating medium for COM. Since this medium is heated and circulated within the 00M heater by natural convection, the heating state for each heat transfer tube is always uniform.

[Embodiments of the invention]

FIG. 1 shows a system diagram of the COM heating device of the present invention. This COM heater is different from the conventional COM heater.
Water supply line 1 that supplies water to the 0M heater, water supply stop valve 2 installed in the middle of this water supply line 1, and C
A water level detector 3 that detects the water level in the 0M heater, and a C0M
An electric heater 4 that heats the water in the heater, a water temperature detector 5 that detects the water temperature in the COM heater, and a vent valve 19 are provided. Based on the signal from the water level detector 3, the opening degrees of the water supply stop valve 3 and the vent valve ]9 are adjusted, and the output of the electric heater 5 is controlled based on the signal from the water temperature detector 5. It has become so. In FIG. 1, other components are not shown in FIG. 3 and are substantially the same as the C0M heater.

Next, the operation of the COM heating device as described above will be explained.

During normal operation, COM enters the inlet channel 7 via the C0M supply pipe 6, passes through the heat transfer tubes 8, reaches the outlet channel 9, and is supplied to the boiler (not shown) via the COM outlet pipe 10. On the other hand, the heated steam passes through the steam supply pipe 11
COM supplied to the 0M heater shell 12 and inside the heat exchanger tube 8
It condenses itself and stays in the hot well 13, and is supplied to the boiler via the condensed water return pipe 14.

During such normal operation, the COM temperature is detected by the COM outlet temperature detector 15 installed in the COM outlet piping 10, and the detected temperature and the COM setting are detected.

The opening degree of the supply tea adjustment valve 16 is controlled based on the deviation from the constant temperature. In addition, the hot well level detector 17 and level adjuster 18 installed in the hot well 13
The heat transfer tubes 8 are controlled so as not to be submerged by condensed water in the heater shells 1 and 2.

On the other hand, during an emergency stop of a COM#A baking device such as a boiler, the water supply stop valve 2 and vent valve 19 are opened and the supply steam adjustment valve 16 and level adjustment valve 18 are closed by the emergency stop signal. Further, the electric heater 4 is powered on by the emergency stop signal, and the water temperature detector 5 is activated. The water supplied into the C0M heater shell 12 via the water supply valve 2 is heated by the operation of the electric heater 4, and the water temperature is detected by the water temperature detector 5, and the detected value of the water temperature and the COM in the heat transfer tube 8 are The output to the electric heater 4 is controlled based on the deviation from the predetermined set water temperature from the temperature at which the water can flow. In this way, the water temperature within the C0M heater shell 12 is kept constant. At the same time, the water level in the C0M heater shell 12 is detected by the water level detector 3, and the water supply valve 2 and vent valve 19 are closed when the entire tube handle is completely submerged.

In this embodiment, water is supplied into the C0M heater shell 12, and this water is heated by the electric heater 4 so that the COM in the heat transfer tube 8 has a viscosity that allows it to flow. In this case, natural convection occurs when the water as a heating medium is heated, which has the advantage of maintaining a uniform water temperature inside the shell. Furthermore, in the above embodiment, an example of water was shown as the heating medium introduced into the C0M heater shell 12;
In the case of a liquid heating medium, heating causes natural convection, so it is also possible to use a liquid heating medium outside the water plate.

Furthermore, in the embodiment shown in FIG. 1, the vertical U-chove type C0M heater was explained as an example, but it can also be applied to horizontal type tubes. It can also be applied to heaters. The point is C
The 0M heater may have a heat exchanger structure that can avoid contact between the COM and the heating medium. Although not shown in FIG. 1, if the water supply line 1 is connected to a hot water line such as a deaerator water tank of a boiler plant and this hot water is supplied into the C0M heater shell, the electric heater 4 can be heated. Initial power can be reduced.

〔Effect of the invention〕

As described above, according to the present invention, if response to the C0M combustion system is delayed due to an emergency shutdown of a boiler, etc., cooling and condensation of the COM in the system starts, but even in an emergency, the COM in the C0M heater can be quickly and It is possible to maintain a state in which the COM can flow uniformly, thereby preventing clogging of the COM, thereby enabling stable operation of the COM combustion.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing an embodiment of the COM heating device of the present invention, Fig. 2 is a schematic overall system diagram of a boiler plant having a COM combustion system, and Fig. 3 is a system diagram of a conventional COM heating device. It is. 1... Water supply line, 2... Water supply stop valve, 3... Water level detector, 4... Electric heater, 5...・Water temperature detector, 6...C0
M supply pipe, 8...Heat transfer tube, 11...Steam supply pipe, 12...C0M heater shell, 13
...Hosotowell, 15...COM
Outlet temperature detector, 19...Vent valve.

Claims (2)

[Claims] (1) Emergency use of a heater that flows coal-oil mixed fuel through a heat transfer tube and heats the coal-oil mixed fuel in the heat transfer tube, and a combustion device that burns the heated coal-oil mixed fuel from the heater. a medium supply means for supplying a liquid heating medium to the heater when stopped; a heating means for heating the liquid heating medium in the heater; a means for detecting the temperature of the liquid heating medium in the heater; A heating device for a coal-oil mixed fuel, comprising: means for controlling the amount of heating in the heating means based on a deviation between a temperature detected by the means and a set temperature of the liquid heating medium. (2) The heating device for coal-oil mixed fuel according to claim (1), wherein the liquid heating medium is water.