WO2016132604A1

WO2016132604A1 - Boiler device and control method for same

Info

Publication number: WO2016132604A1
Application number: PCT/JP2015/080203
Authority: WO
Inventors: 亨敏趙; 井上　貴雄
Original assignee: 三浦工業株式会社
Priority date: 2015-02-19
Filing date: 2015-10-27
Publication date: 2016-08-25
Also published as: JPWO2016132604A1

Abstract

A boiler device (1) comprising a boiler body (2) that heats supplied water by burning fuel, a blower (3) that supplies air for combustion to the boiler body (2), a water supply line (6) that is connected to the boiler body (2) and through which supply water is supplied to the boiler body (2), a water supply pump (7) that is disposed in the water supply line (6) and that increases the pressure of the supply water and supplies same to the boiler body (2), and a controlling unit (91) that controls operation of the blower (3) and the water supply pump (7), wherein the controlling unit (91) comprises a blower starting unit (911) that causes the blower (3) to be operated in response to a blower startup request, a water supply pump starting unit (912) that causes the water supply pump (7) to be operated in response to a start water supply request, and a startup controlling unit (913) that causes the water supply pump (7) not to be operated during a first time period T₁ from when the blower startup request is received even if a start water supply request has been received and then causes the water supply pump (7) to be operated after the first time period T₁ passes.

Description

Boiler device and control method thereof

The present invention relates to a boiler device. This application claims priority based on Japanese Patent Application No. 2015-030765 filed in Japan on February 19, 2015, the contents of which are incorporated herein by reference.

Conventionally, a boiler apparatus that heats feed water with combustion gas generated by burning fuel in a combustion chamber is known. The boiler device includes a blower for supplying combustion air, a water supply pump for supplying water, and the like. In such a boiler device, electricity is consumed to drive the blower and the water supply pump (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 11-63491

By the way, it is known that a large current (starting current) temporarily flows when power is supplied to an electric device such as a blower or a water supply pump. Therefore, in the conventional boiler device, a breaker having a large breaking capacity has been selected in consideration of the possibility that a starting current of a motor, a pump, or the like is superimposed. Thus, when a circuit breaker with a large breaking capacity is used, the problem is that the cost increases.

The present invention has an object of providing a boiler device that enables cost reduction by selecting a circuit breaker having a small breaking capacity.

The present invention includes a boiler body that burns fuel to heat feed water, a blower that supplies combustion air to the boiler body, and a water supply line that is connected to the boiler body and through which the feed water supplied to the boiler body flows. And a control unit that controls the driving of the blower and the feed water pump, the feed water pump being disposed in the feed water line and boosting the feed water and supplying the boosted water to the boiler body, A blower start unit that drives the blower in response to a blow start request, a feed water pump start unit that drives the feed pump in response to a feed start request, and a first time after receiving the blow start request Even if the feed water start request is received until the passage of time or until the drive of the blower is stabilized, the feed water pump is not driven, and the drive of the blower is reduced after the first time has passed. A starting control unit for driving the feed water pump after relates boiler apparatus comprising a.

In addition, when the boiler device is activated, the control unit receives the air supply start request until the second time elapses after the water supply start request is received or until the drive of the water supply pump is stabilized. It is preferable to further include a start-up control unit that drives the blower after the second time has elapsed or after the feed water pump is stabilized without driving the blower.

According to the present invention, it is possible to provide a boiler device that enables cost reduction by selecting a circuit breaker having a small breaking capacity.

It is a figure showing typically the boiler device concerning one embodiment of the present invention. It is a block diagram which shows the structure of the control part in the said embodiment. It is a flowchart explaining the drive control of the air blower and a water supply pump at the time of starting of the boiler apparatus which concerns on the said embodiment. It is a flowchart explaining the drive control of the air blower and a water supply pump during the driving | operation of the boiler apparatus which concerns on the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically showing a boiler apparatus 1 according to an embodiment of the present invention. The boiler device 1 is a steam boiler that generates steam by heating water, and supplies steam to a load device (not shown). The “line” in the present specification is a general term for lines capable of flowing a fluid such as a flow path, a path, and a pipeline.

As shown in FIG. 1, a boiler device 1 connects a boiler body 2 that burns fuel and heats feed water, a blower 3 that supplies combustion air to the boiler body 2, and the boiler body 2 and the blower 3. An air supply duct 4 through which combustion air flows, a fuel supply line 5 for supplying fuel gas to the air supply duct 4, a water supply line 6 connected to the boiler body 2 and through which water supplied to the boiler body 2 flows. , A water supply pump 7 disposed in the water supply line 6, an exhaust pipe 8 connected to the boiler body 2, through which combustion gas (exhaust gas) discharged from the boiler body 2 circulates, and a control device 9.

The boiler body 2 includes a can body 21 and a burner 25. The can body 21 includes a plurality of water pipes 22, a lower header 23, and an upper header 24.

The can 21 constitutes the outer shape of the boiler body 2 and is formed in a rectangular parallelepiped shape in a plan view. A burner mounting portion 26 is formed on the first side surface 21 a located on one end side in the longitudinal direction of the can body 21, and an exhaust port is formed on the second side surface 21 b located on the other end side in the longitudinal direction of the can body 21. 27 is formed.

The plurality of water pipes 22 are arranged in the can body 21 so as to extend in the vertical direction, and are arranged at predetermined intervals in the longitudinal direction and the width direction of the can body 21. The lower header 23 is connected to the lower ends of a plurality of water pipes 22. The upper header 24 is connected to upper ends of a plurality of water pipes 22.

The burner 25 is disposed on the burner mounting portion 26. The mixture of fuel gas and combustion air is burned by the burner 25, and water in the water pipe 22 is heated to generate steam.

The blower 3 supplies combustion air to the boiler body 2 when a fan (not shown) rotates.
The air supply duct 4 has an upstream end connected to the blower 3 and a downstream end connected to the burner mounting portion 26. The air supply duct 4 supplies combustion air sent from the blower 3 to the boiler body 2.

The fuel supply line 5 has an upstream side connected to a fuel supply source (not shown) and a downstream side connected to the air supply duct 4. The fuel supply line 5 supplies fuel gas (for example, LNG) supplied from a fuel supply source to the air supply duct 4. A flow rate adjustment valve 51 is disposed in the fuel supply line 5. The flow rate adjustment valve 51 is configured such that the opening degree can be adjusted. The flow rate of the fuel gas flowing through the fuel supply line 5 is adjusted by the flow rate adjusting valve 51.

The water supply line 6 has an upstream end connected to a water supply source (not shown) and a downstream end connected to a water supply inlet formed in the lower header 23 of the boiler body 2. In the water supply line 6, water supplied from a water supply source circulates.

The water supply pump 7 pressurizes the water supplied through the water supply line 6 and supplies it to the boiler body 2.

The exhaust cylinder 8 is formed in a cylindrical shape, and the base end side is connected to the exhaust port 27. The exhaust cylinder 8 discharges the combustion gas (exhaust gas) generated in the boiler body 2 to the outside.

The control device 9 includes a control unit 91 that controls driving of the blower 3 and the water supply pump 7, and a storage unit 92 that stores various types of information.
The controller 91 outputs a blow start request and a water supply start request according to the state of the boiler device 1 when the boiler device 1 is started. For example, when the boiler apparatus 1 is started, the pressure detected by a pressure detector (not shown) that detects the pressure inside the upper header 24 falls below a predetermined value, and the water pipe is detected by a water level sensor (not shown) provided in the boiler body 2. When the water level in 22 falls below a predetermined value, the control unit 91 outputs a blow start request and a water supply start request simultaneously.

In addition, the control unit 91 outputs a blow start request when the boiler device 1 is in operation from the standby state in which the fuel gas is not combusted to the combustion state in which the fuel gas is combusted. More specifically, when the pressure detected by a pressure detector (not shown) that detects the pressure inside the upper header 24 falls below a predetermined value, the control unit 91 (when the required load of the load device increases) A blow start request is output. Furthermore, during operation of the boiler device 1, the controller 91 outputs a water supply start request even when the water level in the water pipe 22 detected by a water level sensor (not shown) provided in the boiler body 2 falls below a predetermined value. .

FIG. 2 is a block diagram illustrating a configuration of the control unit 91.
As shown in FIG. 2, the control unit 91 includes a blower starting unit 911, a water supply pump starting unit 912, a starting control unit 913, and a startup control unit 914.

The blower starter 911 drives the blower 3 in response to a blow start request. The blower starter 911 drives the blower 3 via an inverter (not shown) so that the flow rate of combustion air supplied from the blower 3 to the boiler body 2 becomes a predetermined flow rate.

The water supply pump starter 912 drives the water supply pump 7 in response to a water supply start request. The feed water pump starter 912 drives the feed water pump 7 so that the feed water flowing through the feed water line 6 has a predetermined flow rate.

The start control unit 913 does not drive the water supply pump 7 even after receiving the water supply start request for the first time T ₁ after receiving the blow start request, and drives the water supply pump 7 after the first time T _{1 has} elapsed. Specifically, the first time T ₁ is the starting current duration of the blower 3. The starting current continuation time is a time during which a large current that temporarily flows continues when driving of the electrical device is started. In other words, the starting current continuation time is the time from when the electric device is driven until the current reaches a steady state. The starting current continuation time (first time T ₁ ) of the blower 3 is, for example, 5 seconds.

The startup control unit 914 does not drive the blower 3 even after receiving the water supply start request for the second time T ₂ after receiving the water supply start request when the boiler device 1 is started, and after the second time T _{2 has} elapsed. The blower 3 is driven. Specifically, the second time T ₂ is the starting current continuation time of the feed water pump 7. In addition, when the boiler apparatus 1 is started, normally, a blow start request and a feed water start request are simultaneously output. The starting current continuation time (second time T ₂ ) of the water supply pump 7 is, for example, 1 second.

The control unit 91 also controls the flow rate adjustment valve 51 in accordance with the pressure (required load of the load device) detected by a pressure detector (not shown) that detects the pressure inside the upper header 24.
The storage unit 92 stores a first time T ₁ that is a start current continuation time of the blower 3, a second time T ₂ that is a start current continuation time of the feed water pump 7, and the like.

According to the above boiler apparatus 1, the combustion air sent to the air supply duct 4 by the blower 3 is mixed with the fuel gas supplied from the fuel supply line 5. Then, the mixed gas of the fuel gas and the combustion air is ejected from the burner 17 into the can 10 and burned.

On the other hand, the water supply is supplied to the lower header 23 of the boiler body 2 by the water supply pump 7 through the water supply line 6. The water supply is supplied into the plurality of water pipes 12 through the lower header 23, and is heated by the heat generated with the combustion of the mixed gas. The heated feed water becomes steam and is collected in the upper header 24 and then supplied to the load device via a steam outlet pipe (not shown). Further, the combustion gas generated by the combustion of the mixed gas is discharged to the outside through the exhaust cylinder 8.

Subsequently, control of driving of the blower 3 and the water supply pump 7 by the control unit 91 will be described. First, the drive control of the blower 3 and the feed water pump 7 when the blow start request and the feed water start request are simultaneously output when the boiler device 1 is started will be described. FIG. 3 is a flowchart illustrating the drive control of the blower 3 and the water supply pump 7 when the boiler device 1 is activated.

First, in step ST11, the boiler device 1 is activated. When the boiler device 1 is activated, when the pressure in the upper header 24 is lower than a predetermined value and the water level in the water pipe 22 is lower than the predetermined value, a blow start request and a feed water start request are output simultaneously. After the boiler apparatus 1 is activated, a blow start request and a feed water start request are output simultaneously, and then the process proceeds to step ST12.
In step ST <b> 12, the feed water pump starter 912 receives the feed water start request and drives the feed water pump 7. After the feed pump 7 is driven, the process proceeds to step ST13.

In step ST13, the startup control unit 914 determines whether or not the elapsed time from the start of driving of the water supply pump in step ST12 exceeds the _second time T2 stored in the storage unit 92. In step ST13, the elapsed time from the start of the driving of the water supply pump 7, if it is determined that the second does not exceed the time T ₂ is a starting current duration of the water supply pump 7 (NO), repeats the steps ST13 .

On the other hand, when it is determined in step ST13 that the elapsed time from the start of driving of the feed water pump 7 has exceeded the _second time T2 (YES), the process proceeds to step 14.
In step ST14, the startup control unit 914 drives the blower 3. By driving the blower 3 in step ST14, a series of processes when the boiler device 1 is started is completed. Thereby, superimposition of the starting current of the feed water pump 7 and the starting current of the blower 3 can be avoided.

Subsequently, the drive control of the blower 3 and the water supply pump 7 during the operation of the boiler device 1 will be described. FIG. 4 is a flowchart illustrating the drive control of the blower 3 and the feed water pump 7 during the operation of the boiler device 1.

First, in step ST21, the blower starting unit 911 determines whether a blow start request is output. If it is determined in step ST21 that the blow start request has not been output (NO), step ST21 is repeated.
On the other hand, when it determines with the ventilation start request | requirement having been output in step ST21 (YES), it progresses to step ST22.

In step ST22, the blower starter 911 drives the blower 3 in response to the blow start request. After driving the blower 3. Proceed to step ST23.

In step ST23, the feed water pump starter 912 determines whether a feed water start request has been output. If it is determined in step ST23 that the water supply start request has not been output (NO), step ST23 is repeated.
On the other hand, if it is determined in step ST23 that a water supply start request has been output (YES), the process proceeds to step ST24.

In step ST24, the feed water pump starting unit 912 determines whether or not the elapsed time from the start of driving of the blower 3 in step ST22 exceeds the _first time T1 stored in the storage unit. In step ST24, the elapsed time from the start of the driving of the blower 3 is, if it is determined not to exceed the first time T ₁ is a start-up current duration of the blower 3 (NO), repeats step ST24.

On the other hand, when it is determined in step ST24 that the elapsed time from the start of driving of the blower 3 has exceeded the _first time T1 (YES), the process proceeds to step ST25.
In step ST <b> 25, the feed water pump starter 912 drives the feed water pump 7.
By driving the feed water pump 7 in step ST25, a series of processes in the case of receiving a blow start request during the operation of the boiler device 1 is completed. Thereby, superimposition of the starting current of the blower 3 and the starting current of the feed water pump 7 can be avoided.

The boiler device 1 according to the present embodiment described above has the following effects.
(1) In the present embodiment, the feed water pump 7 is not driven even after receiving the feed water start request until the first time T ₁ elapses after receiving the blow start request, and after the first time T ₁ has passed. A start control unit 913 for driving the water supply pump 7 is provided.
As a result, during operation of the boiler device 1, the feed water pump 7 is not driven during the starting current duration of the blower 3. Therefore, in the present embodiment, even when a feed water start request is received immediately after receiving a blow start request during operation of the boiler device 1, it is possible to avoid superposition of the start current of the blower 3 and the start current of the feed water pump 7. . By avoiding superimposition of the starting current of the blower 3 and the starting current of the feed water pump 7, a circuit breaker with a reduced breaking capacity can be selected, so that the cost can be suppressed.

(2) Moreover, in this embodiment, the control part 91 with which the boiler apparatus 1 is provided receives the ventilation start request | requirement until _2nd time T2 passes after receiving a feed water start request | requirement at the time of the startup of the boiler apparatus 1. Even when the blower 3 is not driven, a start-up control unit 914 that drives the blower 3 after the second time T ₂ (starting current duration of the water supply pump 7) has elapsed is further provided.
Thereby, when the blower start request and the feed water start request are output at the same time when the boiler device 1 is started, the blower 3 is not driven during the start current continuation time of the feed water pump 7. Therefore, in the present embodiment, even when the boiler device 1 is started, it is possible to avoid superimposition of the starting current of the feed water pump 7 and the starting current of the blower 3. Even when the boiler device 1 is started, by avoiding superposition of the starting current of the feed water pump 7 and the starting current of the blower 3, it is easier to select a circuit breaker with a reduced breaking capacity. Note that the boiler device is normally controlled so that the fuel gas is not ignited until the water level in the boiler body 2 (water pipe 22) becomes equal to or higher than a predetermined level after activation. In the present embodiment, when the boiler device 1 is activated, the feed water pump 7 can be driven before the blower 3 to prevent a rise in the water level of the feed water from being delayed.

The boiler device 1 according to one embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and can be modified as appropriate.
For example, instead of or together with the form in which the first time T ₁ and the second time T ₂ are stored in the storage unit 92 in advance, a driving current measuring device (not shown) is provided for each of the blower 3 and the water supply pump 7. And the control device 9 determines that the driving of the blower 3 and the water supply pump 7 is stable when the current value of these driving current measuring devices is within the predetermined range for the rated current or for a predetermined time. The starting current may be superimposed on the starting current of the feed water pump 7.
Another method for determining whether or not the drive of the blower 3 is stable is to determine whether or not the air flow measuring device is installed in the air supply duct 4 and the air flow of the blower 3 is within a predetermined range for a predetermined time. Also good. Similarly, as another method for determining whether or not the drive of the feed water pump 7 is stable, a flow rate measuring device is installed in the feed water line 6 to determine whether or not the flow rate of the feed water pump 7 is within a predetermined range for a predetermined time. May be.
Moreover, in the said embodiment, although the boiler apparatus 1 was made into the gas fired boiler, this invention is not limited to this, It can also apply to the oil fired boiler.

DESCRIPTION OF SYMBOLS 1 ... Boiler apparatus 2 ... Boiler main body 3 ... Blower 6 ... Water supply line 7 ... Water supply pump 91 ... Control part 911 ... Blower start part 912 ... Water supply pump start part 913 ... Start control part 914 ... Control part at start-up

Claims

A boiler body that burns fuel and heats the feed water;
A blower for supplying combustion air to the boiler body;
A water supply line connected to the boiler body and through which water supplied to the boiler body flows,
A feed water pump disposed in the feed water line and boosting the feed water and supplying the boosted water to the boiler body;
A control unit that controls driving of the blower and the water supply pump, and a boiler device comprising:
The controller is
A blower starter that drives the blower in response to a blower start request; and
A feed water pump starter for driving the feed water pump in response to a feed water start request;
Even if the water supply start request is received until the first time elapses after the air blow start request is received or until the drive of the blower is stabilized, the water supply pump is not driven. A boiler device comprising: a start control unit that drives the water supply pump after driving of the blower is stabilized.
When the boiler device is activated, the control unit does not turn on the blower even if it receives the air blow start request until a second time elapses after the feed water start request is received or until the feed water pump drive is stabilized. The boiler device according to claim 1, further comprising a start-up control unit that drives the blower after the second time has elapsed without being driven, or after the feed water pump is stably driven.
The boiler device according to claim 1 or 2, wherein the first time and the second time are start current continuation times of the blower and the water supply pump, respectively.
The boiler device according to claim 1 or 2, wherein the driving stability of the blower and the feed water pump is determined by determining that each driving current value becomes a rated current.
A boiler body that burns fuel and heats the feed water;
A blower for supplying combustion air to the boiler body;
A water supply line connected to the boiler body and through which water supplied to the boiler body flows,
A feed water pump disposed in the feed water line and boosting the feed water and supplying the boosted water to the boiler body;
A control unit for controlling the drive of the blower and the water supply pump, and a control method of a boiler device comprising:
Driving the blower in response to a blow start request;
Driving the water supply pump in response to a water supply start request;
Even if the water supply start request is received until the first time elapses after the air blow start request is received or until the drive of the blower is stabilized, the water supply pump is not driven. And a step of driving the water supply pump after driving of the blower is stabilized.
When the boiler apparatus is activated, the blower is not driven even if the air blow start request is received until the second time has elapsed since the water feed start request is received or until the drive of the water feed pump is stabilized. The boiler apparatus control method according to claim 5, further comprising a step of driving the blower after elapse of time 2 or after the feed water pump is stably driven.
The boiler device control method according to claim 5 or 6, wherein the first time and the second time are start current continuation times of the blower and the feed water pump, respectively.
The boiler device control method according to claim 5 or 6, wherein the stability of the drive of the blower and the feed water pump is determined by the respective drive current values being rated currents.