JP2010025437A - Emulsified fuel supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply device preventing troubles caused by emulsified fuel remaining in a pipe line during stop. <P>SOLUTION: The emulsified fuel supply device is provided with: a pipe line 9 supplying emulsified fuel from a mixing tank 14 of emulsified fuel to a combustion chamber 2 and having branch parts A, B, C from the upstream side; a pipe line 11 merged with the pipe line 9 in the branch part C branched from the pipe line 9 and positioned downstream of the branch part A; a circulating pump P provided on the pipe line 11; and a pipe line 13 branched in the branch part B between the branch part A and branch part C and connected to the mixing tank 14. When supply of the emulsified fuel to the combustion chamber 2 is stopped, the emulsified fuel supply device achieves a circulation mode selected from a mode (1) in which the emulsified fuel is supplied from the mixing tank 14 via the pipe line 9, branch part A, pipe line 11, branch part C, pipe line 9, branch part B and pipe line 13 and returned to the mixing tank 14 and a mode (2) in which the emulsified fuel is supplied from the branch part A via the pipe line 11 and branch part C, passed through the pipe line 9 and returned to the branch part A. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fuel supply apparatus for supplying emulsion fuel to a combustion chamber and burning it.

  An emulsion fuel is obtained by adding water and an emulsifier to fuel oil and emulsifying it. Emulsion fuel is said to be effective in improving the combustion efficiency of fuel oil and also effective in reducing nitrogen oxides and particulate suspended matter generated during combustion.

However, emulsion fuel has a problem that water and fuel oil are separated over time. For this reason, it is disclosed that water or an emulsifier is mixed and emulsified in fuel oil immediately before use (see, for example, Patent Document 1). However, this method cannot batch-mix fuel oil with water or an emulsifier, and each feed rate must be strictly controlled by matching the operation and timing of the combustor. It is also disclosed that a storage tank for emulsification is provided and the mixed liquid is temporarily reserved and emulsified in the storage tank (see, for example, Patent Document 2). If the liquid staying in the tank is left unattended, the liquid may be separated into oil and water and introduced into the combustion section during re-operation.
JP 2002-294260 A JP 2007-255297 A

  An object of the present invention is to provide a fuel supply device for supplying emulsion fuel to a combustion chamber without causing trouble due to the emulsion fuel remaining in a pipeline when the device is stopped.

The gist of the present invention is an apparatus for supplying emulsion fuel to the combustion chamber 2 and burning it.
A mixing tank 14 for temporarily storing emulsion fuel;
Emulsion fuel is supplied from the mixing tank 14 to the combustion chamber 2, and a pipeline 9 including a branch portion A, a branch portion B, and a branch portion C from the upstream side,
A pipe line 11 branched from the pipe line 9 at a branch part A, and a pipe part 11 joining the pipe line 9 at a branch part C of the pipe line 9 downstream of the branch part A;
A circulation pump P provided in the pipeline 11;
The emulsion fuel supply apparatus includes a pipe line 13 branched from a pipe line 9 between a branch part A and a branch part C of the pipe line 9 at a branch part B and connected to a mixing tank 14.

In the emulsion fuel supply device,
When the supply of emulsion fuel to the combustion chamber 2 is stopped,
A path through which emulsion fuel returns from the mixing tank 14 to the mixing tank 14 via the piping 9, the branching section A, the piping path 11, the branching section C, the piping path 9, the branching section B, and the piping path 13 by the operation of the circulation pump P. Circulation mode (1) circulating in
Circulation mode (2) in which the emulsion fuel circulates along the path returning from the branching section A to the branching section A through the piping path 11 and the branching section C by the operation of the circulation pump P
A cyclic mode selected from can be realized.

  The emulsion fuel supply device further branches from the pipeline 9 at the branch portion D downstream of the branch portion C, and supplies the fuel oil tank 11b for storing the fuel oil and the fuel oil from the fuel oil tank 11b to the combustion chamber 2. A pipe line 15 can be provided, and only the fuel oil can be supplied to the combustion chamber 2 via the pipe line 15 when the combustion chamber 2 is started, and can be switched to the emulsion fuel after the start.

  In the emulsion fuel supply device, only the fuel oil can be supplied to the combustion chamber 2 via the pipe line 15 before the combustion in the combustion chamber 2 stops.

  In the emulsion fuel supply apparatus, a static mixer can be installed downstream of the branching section C of the piping 9.

  According to the present invention, there is provided a fuel supply device that supplies emulsion fuel to a combustion chamber without any trouble caused by emulsion fuel remaining in a pipeline when the device is stopped.

  An embodiment of the emulsion fuel supply device 1 of the present invention will be described with reference to FIG. Additive water 50 and fuel oil 10 as raw materials for the emulsion fuel 8 are stored in the water tank 11a and the fuel oil tank 11b, respectively. The addition water 50 is a mixed solution of water and an emulsifier. From each tank, pipelines 7a and 7b for supplying the raw material to the mixing tank 14 for mixing the raw materials and supply pumps Pa and Pb are installed, and the raw materials are fed into the mixing tank 14 in respective amounts by the operation. Are mixed and emulsified to become an emulsion fuel 8 which is sent out to the combustion chamber 2 via a piping 9 connecting the mixing tank 14 and the combustion chamber 2. Water and an emulsifier may be separately supplied to the mixing tank 14. The mixing tank 14 includes stirring means 52 such as a magnetic stirrer for stirring and emulsifying the liquid in the tank.

  The combustion chamber 2 incorporates a fuel pump (not shown) for sending fuel to the combustion section in the combustion chamber for combustion, and the fuel supplied from the emulsion fuel supply device is sent to the combustion section of the combustion chamber 2 by the fuel pump.

  On the way, the piping 9 is branched at a branching portion A, a branching portion B, a branching portion C, and a branching portion D in order from the upstream side. The branch part A and the branch part C are electrically connected to each other through the piping 11 via the circulation pump P. The pipeline 9 branches at the branch B on the way to the combustion chamber 2, and the branched pipeline 13 is connected to the mixing tank 14. An on-off valve V1 is provided between the branch part B and the mixing tank 14, an on-off valve V2 is provided between the branch part A and the branch part B, and an on-off valve SV2 is provided between the branch part C and the combustion chamber 2. Each is provided. Further, the fuel oil tank 11b is provided with a pipe line 15 for directly sending the fuel oil 10 to the combustion chamber 2, and the pipe line 15 is connected between the branch portion C of the pipe line 9 and the combustion chamber 2 via the on-off valve SV1. Is connected to the pipeline 9 at the branch portion D. Moreover, it is preferable that the static mixer 16 is installed in the downstream of the branch part C of the piping 9 in order to make the mixed state of fuel oil and water uniform.

Next, the operation of this apparatus will be described.
At the start of operation of the combustion apparatus having the combustion chamber 2:
Opening the on-off valve SV1 in the closed state of the on-off valve SV2 → Starting the circulation pump P → Starting and igniting the fuel pump in the combustion chamber 2 → Opening the on-off valve SV2 along with stopping the circulation pump P → Close the on-off valve SV1 Start driving.
When entering the shutdown state for a long time from the running state:
Opening the on-off valve SV1 → closing the on-off valve SV2 → When stopping the fuel pump in the combustion chamber 2 and temporarily extinguishing from the fire extinguishing operation state (when entering the idling state):
Stopping and extinguishing the fuel pump in the combustion chamber 2 → starting the circulation pump P. In this state, the idling state is continued.
When resuming operation from a temporary short-term stop:
The circulation pump P is stopped. The fuel pump in the combustion chamber 2 is activated and ignited.
When entering a long-term shutdown from a temporary short-term shutdown:
The circulation pump P is stopped, the on-off valve SV1 is opened, the on-off valve SV2 is closed, the fuel pump is started and ignited in the combustion chamber 2, and the fuel pump in the combustion chamber 2 is stopped and extinguished.

  By such an operation, in the emulsion fuel supply device 1 of the present invention, only the pure fuel oil 10 can be supplied to the combustion chamber 2 via the pipe line 15 when starting the combustion device, and can be started stably. Ignition is performed. Thereafter, by operating the on-off valve SV1 and the on-off valve SV2 as described above, the emulsion fuel 8 is continuously supplied to the combustion chamber 2, and steady combustion is performed. Further, when the combustion chamber 2 is stopped for a long time, the on-off valve SV1 and the on-off valve SV2 can be operated as described above immediately before the stop so that the combustion chamber 2 can be burned only with pure fuel oil immediately before the stop, The emulsion fuel in the pipe line downstream of the branch part D is purged with the fuel oil, and the emulsion fuel does not remain in the combustion chamber 2 in the pipe line downstream of the branch part D after stopping.

  Immediately after the operation of the combustion apparatus is stopped, the emulsion fuel remains in the pipe line upstream of the branch portion D. In this emulsion fuel, water and fuel oil are often separated. In the emulsion fuel supply device 1 of the present invention, it is possible to prevent the water in the separated state from being sent to the combustion chamber 2 when the operation of the combustion device is resumed. That is, when the on-off valve SV1, the on-off valve SV2, and the circulation pump P are operated as described above at the start of operation from a long-time operation stop state, as shown in FIG. 2 (a), the piping upstream of the on-off valve SV2. A circulation mode (1) is realized in which the emulsion fuel remaining in the passage is circulated in the direction of the arrow around the pipeline 9, the pipeline 13, the mixing tank 14, the pipeline 17, the circulation pump P, and the pipeline 11 and separated. The water or fuel oil in the state is mixed with the emulsion fuel. As a result, the emulsion fuel enters the pipe line upstream of the on-off valve SV2, and it is possible to prevent the separated water from being sent to the combustion chamber 2 when the supply of the emulsion fuel is started. The pipe line 17 is the most upstream part connected to the mixing tank 14 of the pipe line 9.

  In addition, when the fuel oil 10 and the addition water 50 are introduced into the mixing tank 14 and the on-off valve V1 is opened, the on-off valve V2 is closed, and the on-off valve SV2 is closed to operate the circulation pump P, the liquid circulates in the same manner. The liquid is agitated in the mixing tank 14 to promote the emulsification of the liquid mixture.

  FIG. 3 is a plan view showing a preferred embodiment of the connection between the mixing tank 14 and the pipe line 13, and the pipe line 13 is such that the direction of the flow direction of the tip portion is a tangential direction in a plan view of the side wall of the mixing tank 14. The mixing tank 14 is connected. Thereby, the liquid sent into the mixing tank 14 from the pipe line 13 circulates in the direction of the arrow, and is efficiently and uniformly mixed with the emulsion fuel in the mixing tank 14. Moreover, the liquid in the mixing tank 14 is also efficiently stirred.

  Further, when the combustion apparatus is temporarily stopped for a short time, as shown in FIG. 2B, the fuel pump in the combustion chamber 2 is stopped when the on-off valve SV1 is closed and the on-off valve V2 on-off valve SV2 is open. By starting the circulation pump P, the emulsion fuel circulates in the direction of the arrow through the pipelines 11 and 9, and the circulation mode (2) is realized. In the circulation route when the combustion device is temporarily stopped Oil-water separation of the emulsion fuel can be prevented.

  When the combustion device enters the shutdown state for a long time from the operating state, only the fuel oil is burned in the combustion chamber 2 by opening the on-off valve SV1 and closing the on-off valve SV2, and then the fuel pump of the combustion chamber 2 Since stopping and extinguishing are performed, the emulsion fuel does not remain in the combustion chamber 2 in the operation stop state.

  Thus, in the emulsion fuel supply device 1 of the present invention, water separated when the combustion device is started up is not supplied to the combustion chamber 2, and the emulsion fuel can be stably combusted.

  The opening and closing of the on-off valves V1, V2, SV1, and SV2, the start and stop of the supply pumps 40 and 41, and the circulation pump P are combined with a control sequencer provided with a timer and a sensor at predetermined timings and the start and stop of the combustion chamber 2. You may make it carry out automatically according to the temperature of a combustion part. Moreover, you may carry out manually as needed.

  The combustion chamber 2 in the present invention is a combustion chamber of a boiler or an internal combustion engine.

  Examples of the fuel oil used in the present invention include heavy oil, light oil, and kerosene.

  The additive water used in the present invention is a mixture of water and an emulsifier for emulsifying the fuel oil, and the emulsifier depends on the emulsified state of the target fuel oil from various surfactants, organic solvents, organic acids, alkaline water, and the like. Are appropriately blended and used.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

It is a piping system diagram which shows an example of the aspect of the emulsion fuel supply apparatus of this invention. It is a piping system diagram which shows the circulation mode of piping in the emulsion fuel supply apparatus of this invention. It is a top view which shows an example of the aspect of the connection of the mixing tank and piping path in the emulsion fuel supply apparatus of this invention.

Explanation of symbols

1: Emulsion fuel supply device 2: Combustion chambers 7a, 7b, 9, 11, 13, 15, 17: Pipe line 8: Emulsion fuel 10: Fuel oil 11a: Water tank 11b: Fuel oil tank 14: Mixing tank 16: Static Mixer 50: Addition water 52: Stirring means A, B, C, D: Branch P: Circulation pump Pa, Pb: Supply pumps V1, V2, SV1, SV2: On-off valve

Claims (5)

An apparatus for supplying emulsion fuel to the combustion chamber 2 for combustion,
A mixing tank 14 for temporarily storing emulsion fuel;
Emulsion fuel is supplied from the mixing tank 14 to the combustion chamber 2, and a pipeline 9 including a branch portion A, a branch portion B, and a branch portion C from the upstream side,
A pipe line 11 branched from the pipe line 9 at a branch part A, and a pipe part 11 joining the pipe line 9 at a branch part C of the pipe line 9 downstream of the branch part A;
A circulation pump P provided in the pipeline 11;
An emulsion fuel supply apparatus including a pipe line 13 branched from a pipe line 9 between a branch part A and a branch part C of the pipe line 9 at a branch part B and connected to a mixing tank 14. When the supply of emulsion fuel to the combustion chamber 2 is stopped,
A path through which emulsion fuel returns from the mixing tank 14 to the mixing tank 14 via the piping 9, the branching section A, the piping path 11, the branching section C, the piping path 9, the branching section B, and the piping path 13 by the operation of the circulation pump P. Circulation mode (1) circulating in
Circulation mode (2) in which the emulsion fuel circulates along the path returning from the branching section A to the branching section A through the piping path 11 and the branching section C by the operation of the circulation pump P
The emulsion fuel supply device according to claim 1, wherein a circulation mode selected from the following is realized. Further, the fuel tank 11b is branched from the pipe 9 at a branch part D downstream of the branch part C, and includes a fuel oil tank 11b for storing fuel oil and a pipe line 15 for supplying the fuel oil from the fuel oil tank 11b to the combustion chamber 2. 3. The emulsion fuel supply device according to claim 1, wherein only the fuel oil is supplied to the combustion chamber 2 through the pipe line 15 when the combustion chamber 2 is started, and is switched to the emulsion fuel after the start-up. The emulsion fuel supply device according to claim 3, wherein only fuel oil is supplied to the combustion chamber 2 through the pipe line 15 before the combustion in the combustion chamber 2 stops. The emulsion fuel supply apparatus according to any one of claims 1 to 4, wherein a static mixer is installed downstream of the branching section C of the pipe 9.

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