JP4252735B2 - Emulsion fuel supply system and combustion apparatus equipped with the system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an emulsion fuel supply system, and more specifically, supplies emulsion fuel, which is a mixture of at least two liquids including water, alcohol, waste plastic oil and other additives and fuel, to a combustion apparatus such as an engine. The present invention relates to an emulsion fuel supply system.
[0002]
[Background]
Conventionally, when an engine such as a diesel engine is operated, a water emulsion fuel in which fuel and an additive such as water are mixed is used to reduce harmful substances such as nitrogen oxide (NOx) and black smoke in exhaust gas. It is known. In such a water emulsion fuel, an additive is used in order to improve mixing of the fuel and an additive such as water, and a surfactant is used as the additive.
[0003]
By the way, when operating an engine in a diesel engine or the like by burning water emulsion fuel, if the ratio of fuel in the whole water emulsion fuel is large, separation of water emulsion fuel is difficult to occur, so water is separated from water emulsion fuel. Thus, the action of corroding the fuel system can be prevented. Further, when the fuel ratio is large, startability is improved and stable operation is possible.
However, since the ratio of water is reduced, harmful substances such as nitrogen oxides (NOx) and black smoke in the engine exhaust cannot be reduced, and the exhaust gas regulations cannot be cleared.
Also, when a surfactant is used as an additive to mix fuel and water, if there is little surfactant, the fuel and water will not be mixed sufficiently, so that water will be separated when stopping, etc. In addition, rust due to water may occur.
[0004]
In order to solve the problems as described above, conventionally, (1) water / fuel oil is produced and supplied as an emulsion fuel while maintaining the ratio of water and fuel oil substantially constant as desired. And a fuel oil mixing and feeding system is known (Japanese Patent Laid-Open No. 59-33392).
In addition, (2) The engine and the like are used in a state where fuel and water are mixed, but at the time of starting the engine etc., it is switched to operate only with fuel, and it is operated without adding water. Devices are also known.
[0005]
[Problems to be solved by the invention]
However, in the device (1), the ratio of water to fuel oil is kept constant. Therefore, when trying to determine the ratio corresponding to the operation at the start, the fuel is used to obtain a smooth drive. As a result, it is difficult to separate water and corrosion can be prevented. As a result, it is possible to expect a stable start-up operation with good startability, but nitrogen oxide (NOx) in the exhaust of the engine can be expected. ), Harmful substances such as black smoke cannot be reduced, and the exhaust gas regulations cannot be cleared.
Further, since the ratio of water to fuel oil is kept constant, the ratio of surfactant is also constant. As a result, when the ratio of the surfactant is small, water is easily separated when the engine or the like is stopped, and the corrosion prevention effect of the fuel system cannot be expected.
[0006]
In the apparatus (2), the operation is carried out with water emulsion fuel in which water and fuel are mixed during operation, but the operation at the time of start-up is operation only with fuel. Therefore, the startability is good and stable operation can be expected at the start, but since no water is added, harmful substances such as nitrogen oxides (NOx) and black smoke in the engine exhaust can be reduced. Therefore, there arises a problem that the exhaust gas regulations cannot be cleared.
Further, in this apparatus, since the operation is switched between the operation using only the fuel and the continuous operation using the water emulsion fuel obtained by mixing water and fuel, the surfactant is used only during the continuous operation. However, even in this case, since the surfactant is expensive, only a small ratio is used. Therefore, when the operation is stopped, water is easily separated, and the corrosion prevention effect of the fuel system cannot be expected.
[0007]
An object of the present invention is to provide an emulsion fuel supply system capable of preventing corrosion of the fuel system when the combustion apparatus is stopped, improving startability and shortening start time, and a combustion apparatus equipped with the emulsion fuel supply system. It is in.
[0008]
[Means for solving the problems and effects]
The invention according to claim 1 is an emulsion fuel supply system for supplying emulsion fuel to a combustion apparatus, wherein the emulsion fuel is made of at least two or more liquids containing an additive and fuel that corrodes the fuel system as raw materials. Formed by mixing them, The combustion device is provided to stop after a predetermined time by operating a stop switch of a timer, Emulsion raw material supply means for supplying the raw materials, mixing means for mixing the raw materials, and emulsion fuel mixing ratio changing means for changing the mixing ratio of the raw materials in the emulsion fuel, the raw materials by the emulsion fuel mixing ratio changing means The mixing ratio is changed by reducing the ratio of the additive to the fuel before the combustion apparatus is shut down. After operating the stop switch Until the combustor stops Of the predetermined time In the meantime, the emulsion fuel supply system is characterized in that the emulsion fuel in which the ratio of the additive is reduced is accumulated in the fuel system from the mixing means to the fuel injection device of the combustion device.
[0009]
In the present invention, since the mixing ratio of the raw materials in the emulsion fuel can be changed, the fuel from the fuel tank to the fuel piping system in the engine and the fuel injection device can be increased by increasing the fuel ratio before stopping the operation. The ratio of the fuel contained in the system can be increased. Therefore, the separation of the emulsion fuel is less likely to occur until the next operation, and a stable emulsion fuel state can be maintained, so that it is possible to prevent the additive from separating from the emulsion fuel and causing a corrosive action. Corrosion of the fuel piping system, the fuel injection device, etc. in the engine inside can be prevented.
In addition, since the fuel ratio is high at the start of the next operation, the startability is improved, and the start time can be reduced and the white smoke discharge time after the start can be shortened.
[0010]
In the invention of the first aspect, water, alcohol such as methyl alcohol (methanol) and ethyl alcohol (ethanol), waste plastic oil, and the like can be used as the additive.
[0011]
The invention according to claim 2 is the emulsion fuel supply system according to claim 1, wherein the additive is water, and the ratio of the water is 15 to 35 volume percent with respect to the volume 100 of the fuel. It is characterized by this.
In the present invention, since water is mixed in such a ratio that it is difficult to separate, it is possible to prevent corrosion of the fuel system when the operation is stopped, and to improve startability and shorten start-up time.
[0012]
According to a third aspect of the present invention, in the emulsion fuel supply system according to the first or second aspect, the raw material includes an additive, and the mixing ratio of the raw material is changed by the emulsion fuel mixing ratio changing means. Is Before shutting down the combustion device, Against the fuel Said additive And increasing the ratio of the additive, In addition, the emulsion fuel in which the additive ratio is decreased and the additive ratio is increased before the combustion apparatus is stopped enters the fuel system from the mixing means to the fuel injection apparatus of the combustion apparatus. Done to accumulate It is characterized by this.
In the present invention as described above, the fuel ratio and the surfactant ratio are simultaneously increased before the operation is stopped, thereby further reliably preventing the corrosion of the fuel system.
[0013]
According to a fourth aspect of the present invention, in the emulsion fuel supply system for supplying emulsion fuel to the combustion apparatus, the emulsion fuel includes a fuel, an additive, and an additive that stabilizes mixing of the fuel and the additive. It is formed by mixing at least three kinds of liquids as raw materials, The combustion device is provided to stop after a predetermined time by operating a stop switch of a timer, Emulsion raw material supply means for supplying the raw materials, mixing means for mixing the raw materials, and emulsion fuel mixing ratio changing means for changing the mixing ratio of the raw materials in the emulsion fuel, the raw materials by the emulsion fuel mixing ratio changing means The mixing ratio is changed by increasing the ratio of the additive to the fuel before the combustion apparatus is shut down. After operating the stop switch Until the combustor stops Of the predetermined time In the meantime, the emulsion fuel supply system is characterized in that the emulsion fuel with the additive ratio increased is accumulated in the fuel system from the mixing means to the fuel injection device of the combustion device.
[0014]
In the present invention, the ratio of the surfactant in the fuel system from the fuel tank to the fuel piping system in the engine and the fuel injection device is increased by increasing the ratio of the surfactant before the operation is stopped. be able to. Therefore, separation of the emulsion fuel is less likely to occur until the start of the next operation, and a stable emulsion fuel state can be maintained, so that additives such as water can be prevented from separating from the emulsion fuel and causing a corrosive action. As a result, it is possible to prevent corrosion of the fuel piping system, the fuel injection device, and the like in the engine during operation stoppage.
Further, since the engine can be started in a state where the ratio of the surfactant is high, the fuel and additives such as water can be emulsified quickly after the engine is started, and the stability of the emulsion fuel at the start of emulsion production can be increased.
[0015]
The invention according to claim 5 is the emulsion fuel supply system according to claim 4, wherein the additive is a surfactant, and the ratio of the surfactant is 3 to 7 with respect to the volume 100 of the fuel. It is characterized by a volume percentage.
[0016]
In the present invention, since the ratio of the surfactant is increased, the emulsion fuel is hardly separated and a stable emulsion fuel state can be maintained. Accordingly, it is possible to prevent additives such as water from separating from the emulsion fuel to cause a corrosive action, and as a result, it is possible to prevent corrosion of the fuel piping system, the fuel injection device, and the like in the engine during operation stoppage.
Further, since the ratio of the surfactant is increased at the time of starting, the fuel and the mixture can be emulsified quickly after the engine is started, and the stability of the mixed fuel at the start of emulsification production can be increased.
[0017]
According to a sixth aspect of the present invention, in the emulsion fuel supply system according to any one of the first to fifth aspects, the emulsion raw material supply means includes a raw material supply circuit that supplies a plurality of raw materials. Each raw material supply circuit has a bypass circuit that can change the mixing ratio of multiple raw materials. Directional control valve with Is provided.
[0018]
In the present invention, by providing a direction switching valve or the like in the bypass circuit, the control is facilitated, and the cost is reduced as compared with, for example, controlling the rotation speed of the motor.
[0019]
A seventh aspect of the present invention is a combustion apparatus comprising the emulsion fuel supply system according to any one of the first to sixth aspects.
According to the present invention, the fuel system can be prevented from being corroded when the operation is stopped, the startability is improved and the start-up time can be shortened, and the nitrogen oxide (NOx), black smoke, etc. in the exhaust gas can be reduced during operation. Of harmful substances can be reduced.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the emulsion fuel supply system (hereinafter simply referred to as supply system) 1 of the first embodiment can change the mixing ratio of a plurality of liquids, for example, fuel, water, and a surfactant as an additive. The water emulsion fuel produced by mixing in the emulsified state is supplied to a fuel injection device 2A of an engine 2 such as a diesel engine as a combustion device.
[0021]
The supply system 1 includes an emulsion raw material supply means 10, a mixing means 20, a feed pump 30, a booster pump 40, an emulsification means 50, an emulsion fuel storage tank 60, a controller 70, a signal generation means 80, and an emulsion fuel mixing ratio changing means 90. ing.
[0022]
The emulsion raw material supply means 10 includes a fuel supply means 11 for supplying fuel as one of the raw materials constituting the water emulsion fuel, a water supply means 12 for supplying water as an additive as one of the raw materials, and A surfactant supplying means 13 for supplying a surfactant as an additive is included.
[0023]
The fuel supply means 11 includes a fuel tank 11A in which fuel is accommodated, and a fuel circuit 11B, which is one of raw material supply circuits, is connected to the outlet of the fuel tank 11A. A fuel pump 11D driven by a motor 11C having a variable rotation speed is provided downstream of the fuel tank 11A in the fuel circuit 11B. As the fuel stored in the fuel tank 11A, for example, light oil, heavy oil, kerosene, or the like is used.
[0024]
The water supply means 12 includes a water tank 12A in which fuel is accommodated, and a water circuit 12B which is one of raw material supply circuits is connected to an outlet of the water tank 12A. A water pump 12D driven by a motor 12C having a variable rotation speed is provided downstream of the water tank 12A in the water circuit 12B.
[0025]
The surfactant supply means 13 includes a surfactant tank 13A in which a surfactant is accommodated, and a surfactant circuit 13B, which is one of raw material supply circuits, is provided at the outlet of the surfactant tank 13A. Is connected. A surfactant pump 13D driven by a motor 13C having a variable rotational speed is provided downstream of the surfactant circuit 13B.
[0026]
The mixing means 20 mixes fuel, water and additives flowing in from the fuel supply means 11, the water supply means 12, and the surfactant supply means 13. As shown in FIG. A vertically long cylindrical main body 23 is provided on the built-in base 22, and the fuel, water, and additives that have flowed into the main body 23 are uniformly mixed by rotating the impeller 24 with the electric motor 21, and then The structure is such that the feed pump 30 is fed from the outlet 25.
[0027]
The feed pump 30 is a pump for pumping the mixed liquid produced by the mixing means 20 and supplying it to the booster pump 40. The discharge pressure of the feed pump 30 only needs to be set to such an extent that the inlet pressure of the booster pump 40 disposed on the downstream side of the feed pump 30 does not become negative (relative to atmospheric pressure). By doing so, cavitation can be prevented at the inlet of the booster pump 40.
[0028]
As the booster pump 40, for example, a variable volume ratio type plunger pump is used, and examples of the type include a slant axis type axial plunger pump, a swash plate type axial plunger pump, and a rotary cylinder type radial plunger pump. Such a booster pump 40 is driven by an electric motor whose rotation speed can be changed.
[0029]
The emulsifying means 50 makes the water emulsion fuel mixed uniformly and fed at a high pressure from the booster pump 40 via the feed pump 30 to be in an emulsified state.
Although not shown, the emulsifying means 50 includes, for example, a cylindrical main body, and a plurality of rooms partitioned by, for example, a plurality of partition walls are formed inside the main body. Each partition has a plurality of small holes, and a fluid inlet is formed in the main body so that the liquid flows as a swirling flow. It is designed to flow in at high pressure. At this time, due to fluid friction between the liquid mixture ejected from the small hole and the liquid mixture filled in the adjacent chamber, the particles of the liquid mixture break up into an emulsified state, and a water emulsion fuel with a small particle size is obtained. It has a structure like this.
[0030]
The emulsion fuel storage tank 60 stores a predetermined ratio of the emulsified water emulsion fuel sent from the emulsifying means 50 and appropriately sends it to the fuel injection device 2A of the engine 2 according to the ratio consumed by the engine 2. The storage tank 60 is provided with a mixer 61 for expanding the water emulsion fuel inside, and the storage tank 60 detects whether or not an appropriate ratio is always stored in the storage tank 60 at a high level. A detection sensor 62A and a low level detection sensor 62B are provided.
[0031]
The controller 70 can adjust the mixing ratio of the fuel, water, and additive supplied from the fuel supply means 11, the water supply means 12, and the surfactant supply means 13 of the raw material supply means 10 to the mixing means 20. Yes.
That is, the controller 70 is connected to a motor 11C that drives the fuel pump 11D, a motor 12C that drives the water pump 12D, and a motor 13C that drives the additive pump 13D. The rotation speeds of the motors 11C, 12C, and 13C can be changed by the controller 70. By changing the rotation speeds of the motors 11C, 12C, and 13C, mixing is performed from the fuel tank 11A, the water tank 12A, and the additive tank 13A. It can be adjusted by increasing or decreasing the ratio of fuel, water, and additive flowing into the means 20, that is, the ratio of raw materials.
[0032]
Such a controller 70 is driven by a start or stop signal output from the signal generating means 80 before starting or stopping the operation of the engine 2.
And here, the said emulsion fuel mixture ratio change means 90 is comprised including the said controller 70, the signal generation means 80, each motor 11C, 12C, 13C, and each pump 11D, 12D, 13D.
[0033]
Here, the mixing ratio of the fuel and water constituting the water emulsion fuel is appropriately changed according to the operating conditions so as to satisfy both exhaust gas reduction and corrosion prevention.
When the ratio of water to the fuel is large, the startability is poor due to the small amount of fuel, resulting in instability of operation at the start, and water is easily separated, resulting in corrosion at the stop. On the other hand, if the ratio of water is reduced, the amount of fuel increases, so the startability is improved and the operation at the start is stabilized and the water becomes difficult to separate and corrosion can be prevented. The effect is reduced and it becomes difficult to meet exhaust gas regulations.
[0034]
Normally, when the engine 2 is operated, for example, the mixing ratio of water and fuel is set to 50:50. At this time, nitrogen oxide (NOx) is 100 ppm or less, and the exhaust gas effect can be most obtained. However, on the other hand, since the ratio of water is large, it is difficult to prevent corrosion when the operation is stopped.
Here, while being able to obtain the exhaust gas effect, the limit value that can also prevent corrosion during shutdown is set so that the mixing ratio of water and fuel is 20:80. preferable.
[0035]
Therefore, in this embodiment, before the operation is stopped, the water ratio is controlled to be 15 to 35 volume percent with respect to the fuel volume 100, and is close to the mixing ratio 20:80.
[0036]
Further, the mixing ratio of the surfactant and the fuel will be described. The mixing ratio of the surfactant and the fuel as the additive constituting the water emulsion fuel can satisfy both the exhaust gas reduction and the corrosion prevention. As such, it is changed according to the driving situation.
When the ratio of the surfactant to the fuel is large, water becomes difficult to separate, so that rust does not occur and corrosion can be prevented even when the operation is stopped. On the other hand, when the ratio of the surfactant is small, it becomes easy to separate water, rust is easily generated, and corrosion prevention during operation stop cannot be achieved.
[0037]
Normally, during operation, since the surfactant is expensive, only about 1 volume percent is used with respect to the fuel capacity 100. However, in this embodiment, the surfactant is used with respect to the fuel capacity 100 before the operation is stopped. Is controlled to be in the range of 3 to 7 volume percent.
[0038]
In order to perform control to decrease the water ratio or increase the surfactant ratio before stopping the operation, for example, when the engine is stopped with a timer, a predetermined time, for example, 10-30, is pressed after the stop switch is pressed. The time of the timer is set retrospectively so as to stop after a lapse of minutes, and during that time, the controller 70 reduces the rotation of the water pump 12D to reduce the supply of water to the mixing means 20. By doing so, emulsion fuel with a large fuel ratio is supplied between the mixing means 20 and the fuel injection device 2A of the engine 2 until the stop.
[0039]
At the start of operation, for example, a timer is set so as to be started after 5 to 10 minutes have elapsed. This is because, as described above, the emulsion fuel having a large fuel ratio is supplied from the mixing means 20 to the fuel injection device 2A of the engine 2 during the operation stop, and the fuel accumulated at the same time as starting is stored. This is because an emulsion fuel with a large ratio of the above is used, so long as the emulsion fuel with a large ratio of fuel can be supplied to the mixing means 20 during that period.
[0040]
Next, the operation of the first embodiment will be described.
When the ratio of water is reduced before the operation is stopped, the mixture ratio of water and fuel is 50:50, whereas the ratio of water is set to the fuel capacity 100 before the engine 2 is stopped. To 15 to 35 volume percent.
First, before the operation is stopped, for example, 10 to 30 minutes before the timer switch is pressed, a stop signal is output from the signal generating means 80 to the controller 70.
[0041]
The controller 70 supplies the water 12C by reducing the rotation of the motor 12C that drives the water pump 12D. Therefore, the emulsion fuel having a large fuel ratio is supplied from the mixing means 20 to the fuel injection device 2A of the engine 2 during the time until the operation of the engine 2 is stopped, and the state is maintained even after the stop.
At this time, for example, 1 volume percent of the surfactant is supplied to the mixing unit 20 from the additive circuit 23B with respect to the volume 100 of the fuel.
[0042]
At the start of operation, for example, a timer switch is pressed and a start signal is output from the signal generating means 80 to the controller 70 5 to 10 minutes ago.
The controller 70 supplies the motor 12C with reduced rotation and reduced water ratio. Between 5 minutes and 10 minutes, the mixing means 20 produces an emulsion fuel with a large fuel ratio, so that the fuel supplied between the mixing means 20 and the fuel injection device 2A of the engine 2 at the same time as the start-up. Even if the emulsion fuel having a large ratio is started to be combusted by the fuel injection device 2A, the emulsion fuel having the large fuel ratio is continuously supplied from the mixing means 20.
[0043]
Next, when the ratio of the surfactant is increased, before the operation is stopped, the rotation of the motor 13C is accelerated so that the ratio of the surfactant becomes 3 to 7 volume percent with respect to the fuel capacity 100. And increase the ratio of the surfactant.
[0044]
In addition, when the ratio of water is decreased and the ratio of the surfactant is increased, the rotation of the motor 12C is decreased by decreasing the rotation of the motor 12C and the rotation of the motor 13C is accelerated at the same time before the operation is stopped. Increase the surfactant ratio.
At the start of operation, as described above, control is performed to reduce the ratio of water and at the same time increase the ratio of surfactant.
[0045]
The first embodiment as described above has the following effects.
(1) Since the controller 70 can control the water ratio at 15 to 35 volume percent with respect to the fuel capacity 100, the fuel ratio is increased before the operation is stopped. The emulsion fuel having a large fuel ratio can be supplied between the two fuel injection devices 2A. Therefore, it is difficult to cause separation of the emulsion fuel, it is possible to maintain a stable emulsion fuel state, it is possible to prevent the corrosive action caused by the separation of water, and the fuel piping system in the engine and the fuel injection device that are not in operation. Corrosion such as can be prevented.
[0046]
(2) When the next operation is started after the operation is stopped, it can be started with a lot of fuel, so the startability is improved, the operation at the start is stabilized, the start time is reduced and the White smoke discharge time can be shortened.
[0047]
(3) Since the ratio of the surfactant can be controlled by the controller 70 at 3 to 7 volume percent with respect to the fuel volume 100, the mixing means 20 can be increased by increasing the surfactant before the operation is stopped. Emulsion fuel with a high ratio of surfactant can be supplied to the fuel injection device 2A of the engine 2. Therefore, separation of the emulsion fuel is unlikely to occur until the start of the next operation, and a stable emulsion fuel state can be maintained, so that the corrosive action caused by the separation of water can be prevented, and the engine in the engine during the operation stop can be prevented. Corrosion of the fuel piping system, the fuel injection device, etc. can be prevented.
[0048]
(4) After the operation is stopped, the next operation can be started with a large amount of surfactant, so the fuel and water are emulsified quickly after the engine is started, and the emulsion fuel is Stability can be increased and more uniform fuel can be created.
[0049]
(5) The amount of the surfactant is increased only before the shutdown and at the start-up, and the ratio of the surfactant during operation is 1% by volume with respect to the fuel capacity 100. Since the ratio of the active agent can be lowered, the additive can be saved and the economy is good.
(6) Since the ratio of water to fuel can be decreased and the ratio of additives to fuel can be increased at the same time, the corrosion of the fuel system can be more reliably prevented.
[0050]
Next, a second embodiment will be described based on FIG.
The second embodiment is different from the first embodiment in the emulsion raw material supply means 100 and the emulsion fuel mixture ratio changing means 190, but the other configurations are the same. Therefore, only different parts will be described.
[0051]
In the second embodiment, the change of the mixing ratio of fuel, water, and additive is performed by controlling the flow rate adjusting valves 11F, 12F, and 13F by the controller 70.
That is, the raw material supply unit 100 includes a fuel supply unit 111, a water supply unit 112, and an additive supply unit 113.
The fuel circuit 111B of the fuel supply means 111 is provided with a fuel pump 11D driven by a motor 11E that rotates at a constant speed and a flow rate adjusting valve 11F. The water circuit 112B of the water supply means 112 has a constant value. A water pump 12D driven by a motor 12E rotating at a speed and a flow rate adjusting valve 12F are provided, and an additive circuit 113B of the additive supply means 113 is added to a motor 13E rotating at a constant speed. An agent pump 13D and a flow rate adjustment valve 13F are provided.
The emulsion fuel mixture ratio changing means 190 includes the controller 70, the signal generating means 80, the motors 11E, 12E, 13E, and the pumps 11D, 12D, 13D.
[0052]
Such an operation in the second embodiment is performed by controlling the flow rate adjusting valve 12F when reducing the water ratio, and by controlling the flow rate adjusting valve 13F when increasing the ratio of the surfactant, When decreasing the ratio of water and increasing the ratio of additive, the flow rate adjusting valve 12F and the flow rate adjusting valve 13F are controlled.
[0053]
According to the second embodiment as described above, in addition to the same effects as the above (1) to (6),
(7) Since the mixing ratio can be adjusted by controlling the flow rate adjusting valve 12F and the like, there is an effect that the device can be made inexpensive compared with the case of adjusting by changing the rotational speed of the motor 11C and the like.
[0054]
Next, a third embodiment will be described based on FIG.
The third embodiment is different from the first embodiment in the emulsion raw material supply means 200 and the emulsion fuel mixture ratio changing means 290, but the other configurations are the same. Therefore, only different parts will be described.
[0055]
In the third embodiment, the change of the mixing ratio of fuel, water, and additive is performed by the control of the direction control valves 11G, 12G, and 13G by the controller 70 and the bypass circuits 211C, 212C, and 213C.
That is, the emulsion raw material supply means 200 includes a fuel supply means 211, a water supply means 212, and an additive supply means 213.
The fuel circuit 211B of the fuel supply means 211 is provided with the motor 11E, the fuel pump 11D, and the direction control valve 11G, and the water circuit 212B of the water supply means 212 is provided with the motor 12E and the water pump 12D. The direction control valve 12G is provided, and the additive circuit 213B of the additive supply means 213 is provided with the motor 13E, the additive pump 13D, and the direction control valve 13G.
[0056]
Each direction control valve 11G, 12G, 13G has the same structure. For example, a directional control valve 12G will be described as a representative. A two-port switching valve is used as the directional control valve, and one port has a flow path A, whereas the other port has two flow channels. There are roads B and C. The flow path B allows water to flow along the circuit 212B, and the flow path C communicates with the bypass circuit 212C.
[0057]
The flow paths A, B, and C of the directional control valve 12G are formed so that the ratio of the whole water flowing through the water circuit 212B is 1, and the ratio of A is 1 with respect to the flow paths B and C. The flow paths B and C are previously narrowed so that, for example, B is 0.7 and C is 0.3. Therefore, when water is sent from the water tank 22A to the direction control valve 12G via the pump 12D, the water is switched through the flow path A during operation and through the flow paths B and C before operation stop. Water passes through the flow path B at a ratio of 0.7, that is, a small amount of adjusted water is supplied to the mixing means 20, and the remaining water at a ratio of 0.3 flows from the flow path C to the bypass circuit 212C. It flows in and is returned to the water tank 22A.
[0058]
In addition, the restriction of the flow paths of the flow paths B and C may not be 0.7 and C may be 0.3. Corresponding to the fuel supply ratio, etc., corrosion prevention and good startability, and You may change suitably in the range which can acquire an exhaust gas effect.
The emulsion fuel mixture ratio changing means 290 includes the controller 70, signal generating means 80, motors 11E, 12E, 13E, pumps 11D, 12D, 13D, and direction control valves 11G, 12G, 13G. Yes.
[0059]
Such an action in the third embodiment is performed by controlling the directional control valve 12G when reducing the ratio of water, and by controlling the directional control valve 13G when increasing the ratio of additive, When decreasing the ratio of water and increasing the ratio of additive, the directional control valve 12G and the directional control valve 13G are controlled.
[0060]
According to the third embodiment as described above, in addition to the same effects as the above (1) to (6),
(8) Since the mixing ratio of raw materials can be adjusted by controlling the direction control valve 12G and the like, the control is easier than in the case of adjusting by changing the rotation speed of the motor 11C and the like as in the first embodiment. There is an effect that an inexpensive device can be obtained.
[0061]
The present invention is not limited to the above-described embodiments, and includes other modifications as long as the object of the present invention can be achieved.
For example, in the above embodiments, when the ratio of water is reduced, the motor 12C is controlled, the flow rate adjustment valve 12F is controlled, or the direction control valve 12G is controlled. Control the motor 11C for fuel, control the fuel flow control valve 11F, or control the fuel direction control valve 11G so as to increase the fuel ratio and consequently decrease the water ratio. May be. In short, it is only necessary that the water ratio can be controlled to 15 to 35 volume percent with respect to the fuel volume 100.
[0062]
In the second and third embodiments, the motors 11E, 12E, and 13E are provided in the fuel pump 11D, the water pump 12D, and the additive pump 13D, respectively. Thus, the pumps 11D, 12D, and 13D may be driven.
[0063]
Furthermore, in each said embodiment, although the emulsion fuel supply system was used for the diesel engine 2 as a combustion apparatus, it is applicable not only to this but the boiler as a combustion apparatus. The engine 2 can be applied to an external combustion engine or an internal combustion engine.
[Brief description of the drawings]
FIG. 1 is an overall view showing a first embodiment of an emulsion fuel supply system of the present invention.
FIG. 2 is a longitudinal sectional view showing mixing means in the emulsion fuel supply system of the present invention.
FIG. 3 is an overall view showing a second embodiment of the emulsion fuel supply system of the present invention.
FIG. 4 is an overall view showing a third embodiment of the emulsion fuel supply system of the present invention.
[Explanation of symbols]
1 Emulsion fuel supply system
2 Engine
10,100,200 Emulsion raw material supply means
20 Mixing means
30 Feed pump
40 Booster pump
50 Emulsifying means
60 Emulsion fuel storage tank
70 controller
80 Signal generation means
90, 190, 290 Emulsion fuel mixing ratio changing means
211C, 212C, 213C Bypass circuit

Claims (7)

In an emulsion fuel supply system for supplying emulsion fuel to a combustion device,
The emulsion fuel is formed by mixing at least two kinds of liquids containing additives and fuels that corrode the fuel system and mixing them,
The combustion device is provided to stop after a predetermined time by operating a stop switch of a timer,
Emulsion raw material supply means for supplying the raw material;
Mixing means for mixing the raw materials;
Emulsion fuel mixing ratio changing means for changing the mixing ratio of raw materials in the emulsion fuel,
The change in the mixing ratio of the raw materials by the emulsion fuel mixing ratio changing means is performed by decreasing the ratio of the additive to the fuel before operating the combustion apparatus, and after operating the stop switch. During the predetermined time until the combustion apparatus is stopped, the emulsion fuel having the additive ratio reduced is accumulated in the fuel system from the mixing means to the fuel injection apparatus of the combustion apparatus. Emulsion fuel supply system characterized by The emulsion fuel supply system according to claim 1.
The emulsion fuel supply system, wherein the additive is water, and the ratio of the water is 15 to 35 volume percent with respect to the volume 100 of the fuel. The emulsion fuel supply system according to claim 1 or 2,
The raw material comprises an additive,
The change in the mixing ratio of the raw materials by the emulsion fuel mixing ratio changing means is performed by decreasing the ratio of the additive to the fuel and increasing the ratio of the additive before the combustion apparatus is shut down. In addition, the emulsion fuel in which the additive ratio is decreased and the additive ratio is increased before the combustion apparatus is stopped enters the fuel system from the mixing means to the fuel injection apparatus of the combustion apparatus. An emulsion fuel supply system characterized in that the emulsion fuel supply system is accumulated . In an emulsion fuel supply system for supplying emulsion fuel to a combustion device,
The emulsion fuel is formed by mixing and mixing at least three or more liquids containing fuel, additives, and additives that stabilize mixing of these fuels and additives,
The combustion device is provided to stop after a predetermined time by operating a stop switch of a timer,
Emulsion raw material supply means for supplying the raw material;
Mixing means for mixing the raw materials;
Emulsion fuel mixing ratio changing means for changing the mixing ratio of raw materials in the emulsion fuel,
The change in the mixing ratio of the raw materials by the emulsion fuel mixing ratio changing means is performed by increasing the ratio of the additive to the fuel before operating the combustion apparatus, and after operating the stop switch. During the predetermined time until the combustion apparatus is stopped, the emulsion fuel with the additive ratio increased is accumulated in the fuel system from the mixing means to the fuel injection apparatus of the combustion apparatus. Emulsion fuel supply system characterized by The emulsion fuel supply system according to claim 4.
The emulsion fuel supply system according to claim 1, wherein the additive is a surfactant, and the ratio of the surfactant is 3 to 7 volume percent with respect to the volume 100 of the fuel. The emulsion fuel supply system according to any one of claims 1 to 5,
The emulsion raw material supply means includes a raw material supply circuit for supplying a plurality of raw materials, and each of these raw material supply circuits is provided with a directional control valve having a bypass circuit capable of changing the mixing ratio of the plurality of raw materials. An emulsion fuel supply system.   A combustion apparatus comprising the emulsion fuel supply system according to any one of claims 1 to 6.

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