JPS6335231Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fuel supply mechanism for a fuel that is solid or has low fluidity at room temperature.

Conventionally, oils with relatively low viscosity at room temperature, such as heavy oil C, have been used as fuel for boilers, etc., but due to the recent deterioration of the oil situation such as soaring oil prices and unstable supply, it is becoming increasingly difficult for the country to switch fuels. It has become a policy. Furthermore, with the spread of energy conservation, there is a tendency for petroleum vacuum residue oil to become surplus.

Therefore, it is conceivable to use heavy oil such as vacuum distillation residue of petroleum (these become solid at room temperature) as fuel for boilers and the like.

However, the heavy oil has extremely high viscosity and no fluidity at room temperature. Therefore, in order to handle these heavy oils as a fluid and use them as fuel in the same way as conventional heavy oil C, a method of reducing the viscosity by heating may be considered. For this reason, insulating or heating equipment is attached to not only the heavy oil storage tank but also the piping leading to the boiler burner. On the other hand, large boilers and the like are equipped with a plurality of combustion burners, and the burners are normally shut down as needed and operated with an appropriate number of burners. However, in the branch pipe of the oil supply pipe leading to the extinguished burner among the multiple burners of the boiler, the fluid stagnates inside and the temperature decreases due to heat radiation, so the fluidity of the fluid in the branch pipe decreases or solidifies. However, when the burner is relit, fuel cannot be ejected. In order to prevent such a situation from occurring, it is necessary to heat the branch pipe with heating means such as electricity or steam, so an electric heater or the like is attached to the outside of the branch pipe. However, controlling the temperature of all heaters in a plurality of branch pipes one by one requires a large number of accompanying equipment, such as temperature measuring devices, controllers, etc., and the maintenance thereof is also complicated. The present invention provides a new fuel supply mechanism that solves the above-mentioned problems. A fuel supply mechanism consisting of a heater for a branch pipe to a burner, preferably an electric heater, which has a heat dissipation state similar to that of the branch pipe connected to the burner, and is a simulated branch equipped with a heater and a temperature measuring device. This is a fuel supply mechanism in which a pipe is connected to the supply pipe.

According to the present invention, a fuel supply pipe that is solid or has low fluidity at room temperature is provided with a simulated branch pipe that has a heat dissipation state similar to that of a branch pipe connected to a burner, its heater, and a temperature measuring device.

In the present invention, when a dormant burner is ignited, such as when starting a boiler, the heavy oil in the branch pipe for the burner solidifies and loses fluidity. Similarly, the heavy oil in the simulated branch pipe has also solidified. Therefore, by operating the heater of the branch pipe and the heater of the simulated branch pipe at the same time and measuring their temperatures, the state of the oil in the burner branch pipe can be determined. In this way, it becomes possible to know that the temperature of the oil in the burner branch pipe has reached a state suitable for ignition. Another example of how to use the present invention is when a burner that is inactive is always kept on standby so that it can be ignited at any time. It must be constantly heated to maintain its condition. It is also possible to match the heating state with the heating state of the simulated branch pipe, measure the temperature state within the simulated branch pipe, and manage the state within the branch pipe connected to that of the burner at rest based on the measured temperature state.

Hereinafter, the present invention will be explained based on the drawings, but the present invention is not particularly limited to the following drawings.

FIG. 1 shows a combustion system diagram of the present invention. In the figure, 1 is a heavy oil fuel supply pipe that is solid at room temperature, 2 is a branch pipe with a heater attached, 3 is a burner, and 4 is a simulated branch pipe and heater that has a heat dissipation state similar to the branch pipe connected to the burner. 5 is a temperature measuring device, and 6 is a combustion chamber of the boiler.

In the present invention, a simulated branch pipe 4, which has the same shape as the branch pipe 2 connected to the burner equipped with a heater and is equipped with a heater of the same specifications, is connected to a part of the supply pipe 1. One of the features is that the temperature of the fluid in the simulated branch pipe is detected by a temperature measuring device, and the heater attached to each branch pipe is controlled on and off based on this temperature. Known materials can be used without particular limitation. For example, the shape of the supply pipe 1 and the branch pipe 2, and the shape and number of attached equipment such as valves, pressure gauges, and burners may be arbitrarily selected depending on the combustion capacity and the like. Further, the installation position of the simulated piping may be any part of the supply pipe, but it is preferable that it be installed at a location behind each burner branch of the supply pipe where there is no flow.

The fuel used in this invention that becomes fluid at high temperatures is usually a solid at room temperature (including fuels that have low fluidity at room temperature) that have low fluidity at room temperature to several tens of degrees Celsius and cannot obtain fluidity unless heated. Fuels in this range are suitable for heavy oils with a kinematic viscosity of 50 cst or more at 50°C, especially heavy oils with a kinematic viscosity of 250 to 1000 cst at 120°C. Further, as the heater attached to the outside of the branch pipe 2 or the simulated branch pipe 4, a known heater may be used, but in general, a heater wrapped around the outside of the pipe is preferably used because it is easy to operate and compact.

Furthermore, any known temperature measuring device may be used without any particular restriction.

In the present invention, a known method is also used to control on/off the heater of the branch pipe 2. For example, by constructing an electric circuit that connects a temperature measuring device that detects the temperature of the fluid in a simulated branch pipe, a temperature controller, and each heater, heating is achieved by the fluctuation that occurs between the temperature in the simulated branch pipe and the set value of the temperature controller. It is only necessary to configure the device to operate. At this time, known electrical equipment and circuit mechanisms may be used without particular limitation.

[Brief explanation of the drawing]

FIG. 1 shows a system diagram of the present invention.
In the figure, 1 is a solid fuel supply pipe at room temperature, 2 is a branch pipe with an electric heater, 3 is a burner, 4 is a simulated branch pipe and heater, 5 is a temperature measuring device, and 6 is the combustion chamber of the boiler. .

Claims (1)

[Scope of utility model registration request] A fuel supply mechanism consisting of a supply pipe for heating and supplying room-temperature solid fuel to the burners through branch pipes each connected to a plurality of burners, and a heater for the branch pipe to each burner. A fuel supply mechanism in which a simulated branch pipe, which has a heat dissipation state similar to that of a branch pipe and is equipped with a heater and a temperature measuring device, is connected to the supply pipe.