JP2012021749A - Heavy oil combustion boiler apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a soot and dust concentration without causing an increase in the size or cost of an apparatus in a heavy oil combustion boiler apparatus.SOLUTION: The heavy oil combustion boiler apparatus includes: a heavy oil state detection part that detects a state of transferred heavy oil; a heavy oil state changing part that can change the state of the heavy oil; and a heavy oil state control part that changes the state of the heavy oil into an optimal state that a burner combusts the heavy oil using the heavy oil changing part based on the state of the heavy oil detected by the heavy oil state detection part.

Description

  The present invention relates to a heavy oil combustion boiler that uses heavy oil such as petroleum residue to be extracted after refining crude oil to produce fuel oil and petrochemical products.

  By refining crude oil with an oil refining facility, fuel oil, petrochemical products, etc. are manufactured, and then heavy oil such as petroleum residues is taken out from this facility. Since this heavy oil has a very high viscosity, when it is used as energy, the viscosity is reduced by mixing the viscosity adjusting oil, transferred to the furnace, heated to a combustible temperature, and then heated to the furnace. Supplying in.

  However, the heavy oil viscosity adjustment performed in the oil refining process does not require high adjustment accuracy for the transfer. However, when the heavy oil is supplied to the boiler and burned, the heavy oil Viscosity adjustment of this will greatly affect the soot and dust concentration in the exhaust gas discharged from the boiler. That is, when the viscosity of the heavy oil exceeds the combustion viscosity range in the boiler, a combustion failure is caused and the dust concentration increases. Conventionally, adjustment of the viscosity of heavy oil performed in the oil refining process is uncertain, and when the viscosity of heavy oil exceeds the combustion viscosity range, black smoke is generated from the chimney of the boiler. There is a problem of end.

  Conventionally, on the boiler side, dust is prevented from being discharged. For example, there are those described in Patent Documents 1 and 2 below. In Patent Document 1, the dust concentration is controlled by an electric dust collector, and in Patent Document 2, the outlet dust concentration is controlled by a flue gas desulfurization device.

JP 09-173903 A JP 2000-015043 A

  If the dust concentration is controlled on the exhaust gas discharge side of the boiler as in the prior art, it is necessary to install an electric dust collector and a flue gas desulfurization device on the boiler, leading to an increase in size and cost of the device.

  This invention solves the subject mentioned above, and it aims at providing the heavy oil combustion boiler which can control a dust concentration, without causing the enlargement of a device and cost increase.

  In order to achieve the above object, a heavy oil combustion boiler according to the present invention uses heavy oil as fuel oil, and in the heavy oil combustion boiler in which this heavy oil is burned by a burner, A heavy oil state detection unit to detect, a heavy oil state change unit capable of changing the state of the heavy oil, and the heavy oil state based on the heavy oil state detected by the heavy oil state detection unit. A heavy oil state control unit that changes the state to an optimum state for combustion by the burner using the heavy oil state change unit.

  Therefore, by checking the state of the heavy oil to be transferred and changing it to an optimum state in which this heavy oil is burned by the burner, it is possible to perform heavy oil combustion management, increasing the size and The dust concentration can be appropriately controlled without incurring cost.

  In the heavy oil combustion boiler of the present invention, the heavy oil state detection unit includes a temperature sensor that measures the temperature of the heavy oil to be transferred, and a concentration sensor that measures the concentration of the heavy oil to be transferred. The heavy oil state control unit determines the type of heavy oil based on the temperature and concentration of the heavy oil.

  Therefore, by applying the temperature sensor and the concentration sensor as the heavy oil state detection unit, it is possible to appropriately determine the type of heavy oil with a simple configuration.

  In the heavy oil combustion boiler according to the present invention, the heavy oil state changing unit has a heating device that heats the heavy oil, and the heavy oil state control unit is configured according to the determined type of heavy oil. The heating temperature corresponding to the combustion viscosity range is specified, and the heavy oil is heated to the heating temperature by the heating device.

  Therefore, according to the determined type of heavy oil, this heavy oil can be heated to an appropriate heating temperature corresponding to the combustion viscosity range, and an optimal combustion state can be ensured.

  In the heavy oil combustion boiler of the present invention, the heavy oil state detection unit includes a second temperature sensor that measures the temperature of the heavy oil heated by the heating device, and the heavy oil state control unit includes: The heating temperature by the heating device is adjusted based on the temperature of the heated heavy oil detected by the second temperature sensor.

  Therefore, the temperature control of the heavy oil can be performed with high accuracy by feedback control of the temperature of the heated heavy oil.

  In the heavy oil combustion boiler of the present invention, the heavy oil state changing unit has a steam input device for supplying steam to the burner, and the heavy oil state control unit is a type of the determined heavy oil In accordance with the above, the burner steam ratio is specified, and the steam with the specified burner steam ratio is input to the burner by the steam input device.

  Therefore, according to the type of heavy oil determined, it is possible to identify an appropriate burner steam ratio according to this heavy oil, and atomize the heavy oil with the burner steam to ensure an optimal combustion state Can do.

  According to the heavy oil combustion boiler of the present invention, the state of the heavy oil to be transferred is confirmed, and the heavy oil is changed to the optimum state for burning by the burner. The dust concentration can be properly controlled without incurring.

FIG. 1 is a schematic configuration diagram illustrating a heavy oil combustion boiler according to a first embodiment of the present invention. FIG. 2 is a graph showing the transfer viscosity range and combustion viscosity range of petroleum. FIG. 3 is a graph showing the dust concentration with respect to the oil viscosity. FIG. 4 is a schematic configuration diagram illustrating a heavy oil combustion boiler according to a second embodiment of the present invention. FIG. 5 is a graph showing the relationship between the burner vapor ratio and the dust concentration. FIG. 6 is a graph showing the relationship between the burner steam ratio and plant efficiency.

  Exemplary embodiments of a heavy oil fired boiler according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited to this Example, Moreover, when there exists multiple Example, it includes what comprises a combination of each Example.

  FIG. 1 is a schematic configuration diagram showing a heavy oil combustion boiler according to a first embodiment of the present invention, FIG. 2 is a graph showing a transfer viscosity range and a combustion viscosity range of petroleum, and FIG. 3 is a graph showing dust concentration with respect to oil viscosity. It is a graph to represent.

  In recent years, heavy oil with high viscosity has been increasing with the trend toward whitening of fuel oil. In such a heavy oil combustion boiler using heavy oil as a fuel, it is necessary to lower the viscosity by increasing the temperature of the heavy oil having a high viscosity or mixing a viscosity modifier.

In the petroleum refining process, as shown in FIG. 2, a low-viscosity oil A such as light oil or a high-viscosity heavy oil B such as heavy oil or asphalt is refined. However, since the high viscosity heavy oil B has a very high combustion viscosity range and is difficult to handle, a low viscosity oil is mixed and used as a viscosity adjusting oil. That is, 30% low-viscosity oil is mixed with high-viscosity heavy oil B and heavy oil B1, high-viscosity heavy oil B is mixed with 20% low-viscosity oil, heavy oil B2, and high-viscosity heavy oil Oil B is mixed with 10% low viscosity oil and used as heavy oil B3 or the like. And when using such low viscosity oil A and heavy oil B1, B2, B3 with a heavy oil combustion boiler, when transferring from a fuel tank to a boiler, predetermined | prescribed transfer viscosity range (300-700mm < ² > / sec) In addition, when burning in a boiler, it is necessary to reduce the pressure to a predetermined combustion viscosity range (about 15 to 30 mm ² / sec).

  However, the viscosity of the fuel oil transferred to the heavy oil fired boiler is uncertain. In heavy oil fired boilers, fuel oil whose viscosity has been lowered to the combustion viscosity range is introduced into the burner and burned, but the relationship between oil viscosity and soot concentration is unclear. However, as shown in FIG. 3, it can be seen that the soot concentration tends to increase as the oil viscosity increases. In particular, at high viscosities exceeding the combustion viscosity range of the fuel oil, the soot concentration increases significantly. Yes. When fuel oil with an unknown viscosity is heated and then injected into a heavy oil combustion boiler using a burner for combustion, if the viscosity is high, exhaust gas with a high dust concentration may be generated.

  In this embodiment, when high-viscosity heavy oil is used as the fuel oil and this heavy oil is burned by the burner, the optimum condition for burning the heavy oil state by the burner is based on the transfer state of the heavy oil. Change to the state.

  Here, light oil (light oil) is an oil having a specific gravity of about 0.80 to 0.84, and heavy oil (heavy oil) is an oil having a specific gravity of about 0.83 to 0.96. Asphalt (petroleum residue C) is an oil having a specific gravity of about 1.02 to 1.06, and petroleum residue D represents an oil having a specific gravity of 1.06 or more.

  As shown in FIG. 1, the heavy oil combustion boiler according to the first embodiment includes a fuel tank 11, a transport pipe 12, a transport pump 13, an oil heater 14, a boiler body 15, and a burner 16. It has become.

  The fuel tank 11 is supplied with a heavy oil transfer line 21 to which a high-viscosity heavy oil is transferred, and a viscosity adjusting oil (low-viscosity oil) is supplied to the high-viscosity heavy oil transferred through the transfer line 21. A viscosity adjusting oil supply line 22 is connected. Therefore, the fuel tank 11 stores heavy oil having a predetermined viscosity used as fuel oil heated to the transfer viscosity range.

  The transport pipe 12 is a pipe extending from the fuel tank 11 to the boiler body 15, and the heavy oil in the fuel tank 11 can be transported to the boiler body 15 by the transport pump 13. The oil heater (heating device) 14 heats the fuel oil flowing in the transport pipe 12 to a predetermined combustion viscosity range. The oil heater 14 includes a shell 14a and a number of tubes 14b that are provided in the shell 14a and through which heavy oil flows. The shell 14a is connected to a heating steam supply pipe 23 for heating the heavy oil flowing in the tube 14b by supplying the heating steam therein, and a flow rate adjusting valve 24 for adjusting the flow rate is connected to the heating steam supply pipe 23. It is installed.

  Therefore, the fuel tank 11 stores the heavy oil that is configured by mixing the high viscosity heavy oil transferred from the heavy oil transfer line 21 and the viscosity adjusted oil supplied from the viscosity adjusted oil supply line 22. When the transport pump 13 is operated, the heavy oil in the fuel tank 11 can be transported by the transport pipe 12 and heated by the oil heater 14 before being transported to the burner 16.

  And in the heavy oil combustion boiler of this Example 1, the heavy oil transferred as a heavy oil state detection part which detects the state of the heavy oil taken out of the heavy oil transfer line 21 from the fuel tank 11 is carried out. A first temperature sensor 31 for measuring the temperature of the oil and a concentration sensor 32 for measuring the concentration of the heavy oil to be transferred are provided. Moreover, the oil heater 14 mentioned above is provided as a heavy oil state change part which can change the state of heavy oil. Then, oil heating is performed based on the state of heavy oil detected by the heavy oil state detection unit, that is, the temperature of heavy oil measured by the first temperature sensor 31 and the concentration of heavy oil measured by the concentration sensor 32. A control device 33 as a heavy oil state control unit for controlling the vessel 14 is provided. The control device 33 adjusts the heating temperature of the oil heater 14 based on the temperature and concentration of the heavy oil, so that the heavy oil is changed to an optimum state for burning by the burner 16.

  Specifically, the control device 33 determines the type of heavy oil using the graph of FIG. 2 based on the temperature and concentration of the heavy oil. That is, since the heavy oil in the transport pipe 12 is heated to the transfer viscosity range, the concentration measured by the concentration sensor 32 is the transfer viscosity of the heavy oil being transferred, and the first temperature sensor 31 is The type of heavy oil can be determined by specifying the measured temperature at which this transfer viscosity is obtained. Then, the combustion viscosity range is specified according to the determined type of heavy oil, the heating temperature (oil temperature) corresponding to the combustion viscosity range is obtained, and the heating temperature of the heavy oil by the oil heater 14 is adjusted. Thereby, it heats so that the temperature of heavy oil may become the heating temperature corresponding to a combustion viscosity range.

  Moreover, the 2nd temperature sensor 34 which measures the temperature of the heavy oil heated by the oil heater 14 is provided as a heavy oil state detection part. The control device 33 feeds back the temperature of the heated heavy oil detected by the second temperature sensor 34, and the flow rate adjusting valve so that the temperature of the heated heavy oil becomes a heating temperature corresponding to the combustion viscosity range. 24 opening degree is adjusted.

  Therefore, as shown in FIG. 1, high-viscosity heavy oil is transferred to the fuel tank 11 by the heavy oil transfer line 21, and viscosity adjustment oil is supplied from the viscosity adjustment oil supply line 22 to the heavy oil transfer line 21, Heavy oil (fuel oil) having a predetermined viscosity mixed with the both is stored in the fuel tank 11. When the transport pump 13 is activated, the heavy oil in the fuel tank 11 is transported by the transport pipe 12, heated by the oil heater 14, and then transported to each burner 16, from the burner 16 to the inside of the boiler body 15. To be supplied.

  At this time, the first temperature sensor 31 measures the temperature of the heavy oil before heating that flows through the heavy oil transfer line 21, and the concentration sensor 32 detects the temperature of the heavy oil before heating that flows through the heavy oil transfer line 21. Concentration is measured. And the control apparatus 33 determines the kind of heavy oil based on the detected temperature and density | concentration of heavy oil, specifies the combustion viscosity range according to the determined type of heavy oil, and makes this combustion viscosity range into The corresponding heating temperature (oil temperature) is obtained, and the heating temperature of the heavy oil by the oil heater 14 is adjusted to control the oil heater 14 so that the temperature of the heavy oil becomes this heating temperature.

  Thus, in the heavy oil combustion boiler of Example 1, the heavy oil state detection part which detects the state of the heavy oil transferred, and the heavy oil state which can change the state of this heavy oil A heavy oil that changes the state of the heavy oil to an optimum state to be burned by the burner using the heavy oil state changing unit based on the heavy oil state detected by the changing unit and the heavy oil state detecting unit A state control unit.

  Therefore, the state of the heavy oil to be transferred is confirmed, and the heavy oil is changed to an optimum state for burning by the burner. That is, by managing heavy oil combustion, it is possible to properly burn heavy oil in the boiler body, and properly control the soot concentration without increasing the size and cost of the equipment. Can do.

  Moreover, in the heavy oil combustion boiler of Example 1, as a heavy oil state detection part, the 1st temperature sensor 31 which measures the temperature of the heavy oil transferred, and the density | concentration of the heavy oil transferred are measured. A concentration sensor 32 is provided to determine the type of heavy oil based on the detected temperature and concentration of heavy oil. Therefore, by applying the temperature sensor and the concentration sensor, it is possible to appropriately determine the type of heavy oil with a simple configuration, and by determining the type of heavy oil with the temperature sensor and the concentration sensor, It is possible to easily change to an optimal state in which heavy oil is burned by a burner.

  Moreover, in the heavy oil combustion boiler of Example 1, the oil heater 14 which heats heavy oil was provided as a heavy oil state change part, and the control apparatus 33 as a heavy oil state control part was determined. The heating temperature corresponding to the combustion viscosity range is specified according to the type of heavy oil, and the heavy oil is heated to this heating temperature by the oil heater 14. Therefore, according to the determined type of heavy oil, this heavy oil can be heated to an appropriate heating temperature corresponding to the combustion viscosity range, and an optimal combustion state by the burner can be ensured.

  Moreover, in the heavy oil combustion boiler of Example 1, the 2nd temperature sensor 34 which measures the temperature of the heavy oil heated by the oil heater 14 as a heavy oil state detection part is provided, and the control apparatus 33 is the following. The heating temperature by the oil heater 14 is adjusted based on the temperature of the heated heavy oil detected by the second temperature sensor 34. Therefore, the temperature control of the heavy oil can be performed with high accuracy by performing feedback control using the temperature of the heated heavy oil.

  4 is a schematic diagram showing a heavy oil combustion boiler according to a second embodiment of the present invention, FIG. 5 is a graph showing the relationship between the burner steam ratio and the dust concentration, and FIG. 6 is the burner steam ratio and plant efficiency. It is a graph showing the relationship. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  As shown in FIG. 4, the heavy oil combustion boiler according to the second embodiment includes a fuel tank 11, a transport pipe 12, a transport pump 13, an oil heater 14, a boiler body 15, and a burner 16. It has become.

  And in the heavy oil combustion boiler of this Example 1, the 1st temperature sensor 31 which measures the temperature of the heavy oil transferred, and the density | concentration sensor 32 which measures the density | concentration of the heavy oil transferred are provided. ing. Further, as a heavy oil state changing unit capable of changing the state of the heavy oil, an oil heater 14 and a steam input device for supplying steam to the burner 16 are provided. This steam charging device is composed of a burner steam supply pipe 41 for supplying burner steam to the burner 16 and a flow rate adjusting valve 42 provided in the burner steam supply pipe 41 for adjusting the flow rate.

  And the control apparatus 33 which controls a steam injection apparatus based on the temperature of the heavy oil which the 1st temperature sensor 31 measured and the density | concentration of the heavy oil which the density | concentration sensor 32 measured is provided. The control device 33 adjusts the burner steam ratio in the steam input device according to the type of heavy oil based on the temperature and concentration of the heavy oil, so that the state of the heavy oil is optimally burned by the burner 16. Change to a state.

  Specifically, the control device 33 determines the type of heavy oil using the graph of FIG. 2 based on the temperature and concentration of the heavy oil. Then, the burner steam ratio in the steam input device is specified according to the determined type of heavy oil, and the opening degree of the flow rate adjustment valve 42 corresponding to this burner steam ratio is adjusted.

That is, in Example 2, the state is changed by atomizing the heavy oil of the burner to atomize the heavy oil. The amount of steam that is injected into the burner 16 to atomize the heavy oil is calculated based on a control map as shown in FIG. This control map is a diagram showing the relationship between the burner vapor ratio and the soot concentration obtained for each heavy oil viscosity region. In the illustrated control map example, an appropriate viscosity oil (15 to 30 mm ² / sec), high-viscosity oil (30~100mm ² / sec), and 3 area of ultra-high-viscosity oil (100~500mm ² / sec) are shown. In this case, the burner steam ratio is the weight ratio of heavy oil and steam to be introduced into the burner 16.

As shown in the control map of FIG. 5, the amount of steam supplied to the burner 16 uses the correlation between the burner steam ratio and the soot concentration, and the burner corresponding to the viscosity region of the heavy oil to be used and a predetermined soot concentration. Calculated by determining the steam percentage. For example, when the type of heavy oil specified based on the temperature and concentration of heavy oil corresponds to an ultra-high viscosity oil, the burner vapor ratio corresponding to a predetermined dust concentration (for example, 300 mg / Nm ³ ) 12% is required. Accordingly, the amount of steam input to the burner 16 is calculated to be 12% by weight with respect to the amount of heavy oil input to the burner 16. The predetermined dust concentration is an example, and is a value that changes as appropriate according to various conditions of the heavy oil combustion boiler.

As shown in FIG. 3, in the region where the oil viscosity is in the combustion viscosity range, there is a relationship (substantially proportional relationship) in which the dust concentration changes substantially linearly as the oil viscosity increases. However, when the oil viscosity reaches a high viscosity (approximately 100 mm ² / sec or more) that greatly exceeds the combustion viscosity range, the substantially proportional relationship between the oil viscosity and the dust concentration collapses, and the oil viscosity increases. The dust concentration increases rapidly. Therefore, when high-viscosity fuel oil is supplied to the burner 16, it is presumed that there is a burner vapor ratio corresponding to the viscosity region. For this reason, an experiment was performed for each viscosity region of heavy oil, and the relationship (control map) between the burner vapor ratio and the dust concentration shown in FIG. 1 was obtained.

  In the control map of FIG. 5, it can be seen that when the soot concentration is suppressed to a predetermined value, the burner vapor ratio can be set higher for heavy oil with higher viscosity. In addition, for example, in heavy oils having a high viscosity, such as ultra-high viscosity oils, the decrease in soot concentration with increasing burner vapor ratio is more conspicuous. Therefore, as shown in FIG. 6, since the reduction of the dust concentration (the amount of dust) contributes to the improvement of the plant efficiency, it is desirable to set the burner steam ratio high in order to reduce the dust concentration.

On the other hand, setting the burner steam ratio high causes an increase in the amount of steam supplied to the boiler body 15 and a decrease in the furnace temperature. Therefore, since the dust concentration and the burner steam ratio are contradictory to each other for the plant efficiency of the heavy oil fired boiler, it is desirable to set an optimal burner steam ratio that can obtain good plant efficiency in consideration of various conditions. In the case shown in FIG. 6, the burner steam ratio at which the improvement in plant efficiency due to the reduction of dust and the deterioration in plant efficiency due to the introduction of steam intersects is about 12%, and fuel oil having this value in the ultra-high viscosity region is predetermined. This corresponds to the burner vapor ratio to be burned at a soot and dust concentration (300 mg / Nm ³ ).

  In the second embodiment, the oil heater 14 is heated so that the heavy oil in the transport pipe 12 has a predetermined temperature set in advance, and the control device 33 has the second temperature sensor 34 The measured temperature of the heated heavy oil is feedback controlled. In this case, the predetermined temperature of the heavy oil is a heating temperature corresponding to the combustion viscosity range of the heavy oil having a relatively low viscosity among the heavy oils to be used.

  Therefore, as shown in FIG. 4, the high-viscosity heavy oil is transferred to the fuel tank 11 by the heavy oil transfer line 21, and the viscosity adjustment oil is supplied from the viscosity adjustment oil supply line 22 to the heavy oil transfer line 21, Heavy oil (fuel oil) having a predetermined viscosity mixed with the both is stored in the fuel tank 11. When the transport pump 13 is activated, the heavy oil in the fuel tank 11 is transported by the transport pipe 12, heated by the oil heater 14, and then transported to each burner 16. The burner 16 is supplied with burner steam from the burner steam supply pipe 41, so that heavy oil atomized by the burner steam is supplied from the burner 16 into the boiler body 15.

  At this time, the first temperature sensor 31 measures the temperature of the heavy oil before heating that flows through the heavy oil transfer line 21, and the concentration sensor 32 detects the temperature of the heavy oil before heating that flows through the heavy oil transfer line 21. Concentration is measured. Then, the control device 33 determines the type of heavy oil based on the detected temperature and concentration of the heavy oil, specifies the burner steam ratio by the steam input device according to the determined type of heavy oil, and the burner The burner steam ratio supplied to the burner 16 from the steam supply pipe 41 is controlled.

  As described above, in the heavy oil combustion boiler according to the second embodiment, the heavy oil state changing unit is provided with a steam input device (burner steam supply pipe 41, flow rate adjusting valve 42) for supplying steam to the burner 16, The control device 33 specifies the burner steam ratio according to the determined type of heavy oil, adjusts the opening degree of the flow rate adjustment valve 42, and throws the steam of the specified burner steam ratio into the burner 16. Yes.

  Therefore, it is possible to identify an appropriate burner vapor ratio according to the type of heavy oil determined and to atomize the heavy oil with this burner vapor to ensure an optimal combustion state. As a result, the soot concentration can be appropriately controlled without increasing the size and cost of the apparatus.

  In this case, the amount of steam input to the burner 16 is determined based on the correlation (control map) between the burner steam ratio and the dust concentration obtained for each heavy oil viscosity region, The heavy oil combustion boiler calculated by calculating the burner steam ratio corresponding to the soot and dust concentration can optimize the steam input amount of the burner 16 and burn heavy oil with high viscosity. By adopting the optimized steam input in this way, it is possible to eliminate or minimize the prior heat treatment that reduces the viscosity of the heavy oil, and the relatively high viscosity heavy oil Can be burned well.

  In Example 2, a concentration sensor for detecting the concentration of heavy oil heated by the oil heater 14 is provided, and the type of heavy oil is specified based on the temperature and concentration of the heated heavy oil. The burner vapor ratio may be determined. In this case, the density sensor 32 can be eliminated.

  The heavy oil combustion boiler according to the present invention makes it possible to control the concentration of dust without changing the size of the heavy oil to an optimal state for burning with a burner without causing an increase in size and cost of the apparatus. It can be applied to any heavy oil fired boiler.

11 Fuel Tank 12 Transport Pipe 13 Transport Pump 14 Oil Heater (Heavy Oil Condition Changer, Heating Device)
15 Boiler body 16 Burner 23 Heating steam supply piping 24 Flow rate adjustment valve 31 First temperature sensor (heavy oil state detection unit)
32 Concentration sensor (heavy oil condition detector)
33 Control device (Heavy oil condition control unit)
34 Second temperature sensor (heavy oil state detector)
41 Burner steam supply pipe (steam injection device)
42 Flow control valve (steam injection device)

Claims (5)

In heavy oil combustion boilers that use heavy oil as fuel oil and burn this heavy oil with a burner,
A heavy oil state detector for detecting the state of heavy oil;
A heavy oil state changing section capable of changing the state of heavy oil;
Based on the heavy oil state detected by the heavy oil state detection unit, the heavy oil state is changed to an optimum state for burning by the burner using the heavy oil state changing unit. A control unit;
A heavy oil fired boiler characterized by comprising:   The heavy oil state detection unit includes a temperature sensor that measures the temperature of the heavy oil to be transferred, and a concentration sensor that measures the concentration of the heavy oil to be transferred. The heavy oil combustion boiler according to claim 1, wherein the type of heavy oil is determined based on the temperature and concentration of the heavy oil.   The heavy oil state changing unit has a heating device for heating the heavy oil, and the heavy oil state control unit sets a heating temperature corresponding to the combustion viscosity range according to the determined type of heavy oil. The heavy oil combustion boiler according to claim 2, characterized in that the heavy oil is heated to the heating temperature by the heating device.   The heavy oil state detection unit includes a second temperature sensor that measures the temperature of the heavy oil heated by the heating device, and the heavy oil state control unit detects the heating detected by the second temperature sensor. The heavy oil combustion boiler according to claim 3, wherein a heating temperature by the heating device is adjusted based on a temperature of a later heavy oil.   The heavy oil state changing unit has a steam input device for supplying steam to the burner, and the heavy oil state control unit specifies a burner steam ratio according to the determined type of heavy oil, The heavy oil combustion boiler according to claim 2, wherein steam of the specified burner steam ratio is charged into the burner by the steam charging device.

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