KR101354918B1 - Emulsion fuel feeding device - Google Patents

Abstract

(assignment)
It is possible to detect the ratio of water in the emulsion fuel supplied from the emulsion fuel supply device at low cost and without problems of durability.
(Solution)
In an emulsion fuel supply device for supplying an emulsion fuel mixed with fuel and water to an engine, the engine speed detector 82 uses the governor controller 80 to convert the amount of fuel to the engine 2 and the rotation speed of the engine 2 into an engine. And the engine rotation commander 84. The governor controller 80 calculates the moisture content of the emulsion fuel from the amount of fuel to the engine 2 and the rotation speed of the engine 2.

Description

EMULSION FUEL FEEDING DEVICE}

The present invention relates to an emulsion fuel supply apparatus for supplying an engine with an emulsion fuel obtained by mixing fuel with water.

An example of such an emulsion fuel supply apparatus is disclosed by patent document 1. As shown in FIG. According to the technique of Patent Literature 1, the water supply amount is controlled so that the water and fuel are mixed by a mixer and supplied to the engine in advance, but the water content is controlled at the output side of the mixer in order to calculate the hydrolysis rate. A detection sensor is installed.

Japanese Patent No.4208349

However, a sensor that detects the ratio of water to fuel like this hydrolysis rate detection sensor is expensive. In addition, the mixer in which this sensor is installed on the output side is installed in the vicinity of the engine. Therefore, the sensor is susceptible to vibration of the engine. In addition, since the vicinity of the engine is a high temperature, the sensor is exposed to a high temperature. Since the sensor is susceptible to vibration and exposed to high temperatures, there is a problem in durability.

An object of the present invention is to provide an emulsion fuel supply device which is free from problems of durability and enables the ratio of water to be detected at low cost.

An emulsion fuel supply device of one embodiment of the present invention supplies an emulsion fuel obtained by mixing fuel and water to an engine. The emulsion fuel supply device has a moisture content calculating means for calculating the moisture content of the emulsion fuel from the amount of fuel to the engine and the rotational speed or load state of the engine. As the water content, for example, the ratio of the amount of water to the sum of the amount of water and the amount of fuel may be obtained, or the hydrolysis rate, which is the ratio of the amount of water to the amount of fuel, may be obtained.

There is a correlation between the engine speed or the state of the load and the amount of fuel. For example, when the rotation speed is large or when the load ratio is large as a load state, the amount of fuel also increases. However, the relationship between the rotational speed or the state of the load and the amount of fuel is changed depending on the water content. For example, when the moisture content is large, the amount of emulsion fuel increases even at the same rotational speed or load. A relation formula indicating the relationship between the amount of the emulsion fuel and the rotational speed or the state of the load and the water content is prepared, and the fuel amount detecting means for detecting the amount of the emulsion fuel and the rotational speed detecting means or the load state detecting means are provided. The moisture content can be calculated by inputting the detected value of? The calculation may be performed as described above, or the table stores the relationship between the rotational speed or the load state, the amount of the emulsion fuel and the water content, and inputs the detected value of the rotational speed or the load state and the amount of the emulsion fuel to the table. The water content corresponding to these values can also be read from the table.

When the moisture content is calculated in this way, it is not necessary to install a sensor for detecting the water ratio, it can be made at low cost, and there is no need to consider the durability of the sensor because it is not necessary to install the sensor in the mixer near the engine.

A comparison means may compare the water content and the actual water content to the engine calculated by the emulsion fuel supply device, and may notify this when the difference between the water content and the actual water content is greater than a predetermined value. In this case, there is a possibility of failure of the water pump used to supply water, and this can be notified. In addition, the exhaust temperature of an engine can also be referred to. If the difference between the water content and the actual water content is greater than a predetermined value, the exhaust temperature may be low if the exhaust temperature is low. If the exhaust temperature is high, the water may be insufficient. In addition, as long as the difference between the water content and the actual water content is smaller than the predetermined value, the actual water content can be corrected by the water content. In addition, if there is a distance between them when supplying emulsion fuel from the mixer to the injection pump included in the engine, even if the emulsion fuel is output from the mixer, it takes time to reach the injection pump. When comparing rates, it is desirable to consider.

In addition, it is preferable to provide a recording means for recording the change in moisture content. By recording in this way, it is possible to calculate how much nitrogen oxide is reduced.

1 is a block diagram of an emulsion fuel supply device of an embodiment of the present invention.
FIG. 2 is a diagram illustrating a relationship between the amount of emulsion fuel and the rotational speed or load rate of the engine in the emulsion fuel supply device of FIG. 1.

The emulsion fuel supply apparatus of one embodiment of the present invention uses the injection pump 6 and the injection valve 8 to supply emulsion fuel to a cylinder 4 of an engine, for example, a diesel engine 2, as shown in FIG. Through the supply.

In order to make an emulsion fuel, it is necessary to mix fuel, for example, heavy oil, with water, and, therefore, a fuel system and a water system are provided.

In the fuel system, the fuel oil stored in the fuel tank 10 is sent to the oil circulation circuit 14 through the booster pump 12. In the oil circulation circuit 14, fuel oil circulates through the confluence unit 16, the pressurized circulation pump 18, the fuel heating heater 20, and the relief valve 22. The fuel oil circulates under the action of the pressurized circulation pump 18. The pressurized circulation pump 18 and the fuel heating heater 20 are controlled by the control unit 23. A branch passage 24 is provided between the fuel heating heater 20 and the relief valve 22, and the branch passage 24 is connected to the passage 28 through the opening / closing valve 26. The passage 28 supplies the emulsion fuel to the injection pump 6 as described later. A branch passage 30 is provided between the fuel heating heater 20 and the branch point of the branch passage 24. The branch passage 30 is connected to the mixer 37 via the on-off valve 32, the oil flow transmitter 34, and the three-position switching valve 36. The flow rate detected by the flow rate transmitter 34 is supplied to the control part 23, and the 3-position switching valve 36 is controlled by the control part 23 as mentioned later.

In the water system, a water passage is connected from the water supply source 38 to the water tank 42 through the shutoff valve 40. The shutoff valve 40 is controlled by the control unit 23. The water tank 42 includes a water booster pump 44, a filter 46, a flow transmitter 49, a water pump 50, a shutoff valve 52, a water heating heater 54, a relief valve 56, 3 The mixer 37 is connected via the position switching valve 36. The water booster pump 44, the water pump 50, the shutoff valve 52, and the water heating heater 54 are controlled by the control unit 23. In addition, the flow rate detected by the flow rate transmitter 49 is supplied to the control part 23. Pressure transmitters 58, 60, 62 are connected between the water booster pump 44 and the filter 46, between the filter 46 and the flow transmitter 49, and between the water pump 50 and the shutoff valve 52, respectively. The pressure detected by these is supplied to the control unit 23.

The mixer 37 mixes water and fuel oil supplied through the 3-position switching valve 36, and sends it out as an emulsion fuel. The outlet of the mixer 37 is connected to the injection pump 6 via the on-off valve 64. The passage between the on-off valve 64 and the injection pump 6 is a passage 28 for supplying the above-mentioned emulsion fuel to the injection pump 6. The amount of emulsion fuel supplied to the injection pump 6 is controlled at the injection pump 6, and is supplied from the injection valve 8 to the cylinder 4 of the engine 2. The excess emulsion fuel is sent to the passage 66. The passage 66 is connected to the mixer 37 via the shutoff valve 68, the circulation pump 70, the flow transmitter 72, and the three-position switching valve 36. The mixer 37, the shutoff valve 68, the circulation pump 70, the flow rate transmitter 72, and the three-position switching valve 36 constitute the circulation circuit 74. The shutoff valve 68 and the circulation pump 70 are controlled by the control unit 37, and the flow rate detected by the flow rate transmitter 72 is supplied to the control unit 23. In addition, the passage 78 having the opening / closing valve 76 connects the portion of the circulation circuit 74 with the injection pump 6 to the rear end of the relief valve 22 of the circulation circuit 14.

The three-position switching valve 36 has first to third switching positions, and is switched by any one of the first to third switching positions by the controller 23. In the first switching position, the flow transmitter 34 and the mixer 37 are connected, and the flow transmitter 72 and the relief valve 56 are blocked with respect to the mixer. In the second switching position, the flow rate transmitter 34 and the mixer 37 are connected, and the flow rate transmitter 72 and the relief valve 56 are connected. In the third switching position, the flow transmitters 34 and 72 and the relief valve 56 are connected to the mixer 37.

Therefore, only fuel oil is supplied to the mixer 37 in the first switching position, and as a result, only fuel oil is supplied to the injection pump 6. Only fuel oil is supplied to the injection pump 6 through the mixer 14 in the second switching position, and the emulsion fuel supplied through the flow transmitter 72 is evacuated to the water system. In the third switching position, fuel oil, water, and the recovered emulsion fuel are supplied to the mixer 37, and the emulsion fuel obtained by the mixer 37 is supplied to the injection pump 6. In addition, when the emulsion fuel is evacuated by switching to the second switching position, the water pumps 44 and 50 are stopped to flow back to the relief valve 56 side.

Booster pump 12, pressurized circulation pump 18, on / off valves 26, 32, 64, shutoff valve 68, circulation pump 70, shutoff valve 40, water booster pump 40, water pump The 50, the shutoff valve 52, and the three-position switching valve 36 are controlled by the control unit 23. For these controls, data from the flow rate transmitters 34, 49 and 72 and the pressure transmitters 58, 60 and 62 are used. Moreover, the control part 23 calculates the actual hydrolysis rate of the emulsion fuel from the mixer 37 based on these data. The hydrolysis rate is expressed as W / F * 100 representing the ratio of water quantity (W) to oil quantity (F) as a percentage. The actual hydrolysis rate is determined and calculated on the basis of the above data on the amount, oil amount, and emulsion fuel, amount, and oil amount returned from the circulation circuit 66 to the mixer 37 newly.

This actual water content rate is supplied to the governor controller 80 which controls the injection pump 6. The governor controller 80 is also supplied with a rotation speed signal from the engine speed detector 82 which detects the rotation speed of the engine 2 and a rotation speed command signal from the rotation speed command transmitter 84. The rotation speed command signal indicates the amount of fuel to be supplied. The governor controller 80 adjusts the injection amount of the emulsion fuel from the injection pump 6 based on these engine rotation speed and rotation speed command signals. At this time, the moisture content required by the emulsion fuel supplied from the mixer 37 is calculated. That is, the governor controller 80 functions as a moisture content calculation means. The water content is a percentage of the amount of water to the sum of the amount of water and fuel oil. In addition, the load state of the engine 2 detected by the detection means may be provided instead of the rotational speed command signal.

As shown in Fig. 2, a function that takes an engine speed or an engine load as a factor between the amount of emulsion fuel (amount of emulsion fuel commanded by the speed command signal) and the engine speed or the engine load, for example, an engine When the number of revolutions or the engine load is large, the amount of fuel oil also increases, specifically, the amount of fuel oil can be represented by a linear function. The function has different moisture content as a parameter, and is moving in parallel, for example. Therefore, if the quantity of emulsion fuel at the predetermined engine speed or engine load is known, the water content at that time can be calculated. For example, as shown in FIG. 2, when 50% water content, 25% water content, only fuel oil, and each engine speed or the engine load and the amount of fuel oil are respectively determined, interpolation is performed. The moisture content can be calculated from the engine speed or the engine load and the amount of fuel oil corresponding thereto.

For example, in FIG. 2, if the engine speed or the engine load is a and the amount of fuel oil at that time is b, the amount of fuel oil at the time of driving only the fuel oil when the engine speed or the engine load is a (b0) And the amount of emulsion fuel at run time at 25% moisture content (b25) when b is located between the amount of emulsion fuel at operation (25) and at 25% water content when engine speed or engine load is a It is determined whether b is located between the amount b50 of the emulsion fuel at the time of operation at 50% water content. If b is determined to be located between b25 and b50, the water content can be calculated by multiplying the value of (b-b25) / (b50-b25) by the difference between 50% water content and 25% water content and adding it to 25%. .

The above-described calculation may be performed by the governor controller 80, and the amount of emulsion fuel and the moisture content in the combination of engine speed or engine load are calculated in advance and stored in a table, and the amount of emulsion fuel and engine speed Alternatively, it may be configured to read the water content corresponding to the engine load when it is input.

Thus, since it is comprised so that a moisture content may be calculated by calculation, it is not necessary to provide an expensive moisture content sensor and it does not need to consider durability of a moisture content sensor.

The governor controller 80 is configured to compare the water content calculated in this way with the actual water content supplied from the controller 23 and to generate a warning when the difference between them is larger than a predetermined value. In other words, the governor controller 80 also functions as a comparison means. For example, the notification means installed in the control panel (not shown) of the engine 2, for example, the indicator 801 is turned on or the alarm 802 is operated. In this comparison, the exhaust temperature of the engine 2 may be measured by a temperature detecting means, for example, a temperature measuring instrument, and a warning may be generated with reference to the measured exhaust temperature. For example, if the exhaust temperature is low when the difference between them is greater than a predetermined value, it can be determined that water is supplied to the engine 2, and a warning indicating the effect is issued. If the exhaust temperature is high, there is little water. Since the judgment can be made, a warning indicating the effect is generated. These are caused, for example, by the failure of the water pump 50.

In addition, since the mixer 37 and the injection pump 6 are located apart from each other when comparing the moisture content and the actual water content rate, a time delay is generated between the actual water content rate at the outlet side of the mixer 37 and the actual water content rate at the injection pump 6. have. Thus, the actual water content rate is delayed by a predetermined time and compared with the moisture content in the governor controller 80.

In addition, the emulsion fuel is circulated to the mixer 37 through the circulation circuit 74. Therefore, there is a possibility that an error occurs in the calculated actual free-flow rate. Therefore, in the governor controller 80, when the actual water content is within a predetermined range, the actual water content is corrected based on the moisture content. For example, the ratio of the real water content rate and the water content rate before an error occurs is calculated beforehand, and this ratio is multiplied by the real water content rate and corrected.

Further, the governor controller 80 is configured to compare the calculated water content with a predetermined upper limit value and to generate an alarm when the water content becomes higher than the upper limit value. This alarm also displays the indicator 801 provided in the above-described control panel, or generates a sound to the alarm 802 indicating that the upper limit value has been exceeded. At the same time, the controller 22 controls the pump 50 or the like to adjust the water quantity based on this warning to avoid misfire in the engine 2. In addition, it is also possible for a worker to manually control the pump 50 or the like based on this warning.

The above-described calculation of the water content is calculated by the governor controller 80 at every elapse of a predetermined time, and the calculated water content is stored in the memory 803 included in the storage means, for example, the governor controller 80. Based on this recording, that is, the change in moisture content, the amount of reduction of nitrogen oxide in the engine 2 is calculated.

In the above embodiment, W / (W + F) * 100, which is a percentage of the quantity F of the fuel oil and the quantity W, is used as the water content. You can also use W / F * 100, which is a percentage of the quantity (W). In this case, when compared with a real hydrophilicity, it also computes as a thing equivalent to W / F * 100.

Claims (4)

An emulsion fuel supply device for supplying an engine with an emulsion fuel mixed with fuel and water,
Fuel amount detecting means for detecting the amount of emulsion fuel;
Rotation speed detection means or load state detection means for detecting the rotational speed or the load state of the engine;
And a moisture content calculating means for calculating the moisture content of the emulsion fuel by inputting the detected amount of emulsion fuel and the engine speed or load state in a relational expression indicating the relationship between the quantity and the rotational speed or the state of the load and the water content of the emulsion fuel prepared in advance. Emulsion fuel supply device, characterized in that. The method of claim 1,
The comparison means compares the water content and the actual water content to the engine calculated by the emulsion fuel supply device, and notifies this when the difference between the water content and the actual water content is greater than a predetermined value. Feeding device. The method of claim 1,
When the water content reaches a predetermined upper limit, this is notified. The emulsion fuel supply apparatus. The method of claim 1,
And a recording means for recording the change in the moisture content.

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