WO2020138771A1

WO2020138771A1 - Combustor and method for controlling combustion of combustor

Info

Publication number: WO2020138771A1
Application number: PCT/KR2019/017477
Authority: WO
Inventors: 송용민; 도남수
Original assignee: 주식회사 경동나비엔
Priority date: 2018-12-28
Filing date: 2019-12-11
Publication date: 2020-07-02
Also published as: KR20200081677A; KR102294678B1

Abstract

The present invention relates to a combustor and a method for controlling the combustion of the combustor and, more specifically, to a combustor for allowing stable combustion by automatically responding to a misfire and an ignition failure, and a method for controlling the combustion of the combustor. To this end, the method for controlling the combustion of the combustor, of the present invention, performs control so as to supply gas in a preset gas supply amount to a combustor unit, thereby attempting ignition, increase the amount of gas supplied when an ignition failure is determined, thereby attempting ignition again, and maintain, when it is determined that ignition has succeeded, a combustion state by using a gas supply amount at the time of successful ignition as a minimum gas supply amount.

Description

Combustion equipment and combustion control method of combustion equipment

The present invention relates to a combustion device and a combustion control method for a combustion device, and more particularly, to a combustion device and a combustion control method for a combustion device stably combusted in response to misfire and non-ignition.

Referring to FIG. 1, a description will be given of a combustion control method of a cascade system 10 of a combustion apparatus that provides heating and hot water using combustion of gas by a conventional technique.

The combustor cascade system 10 is composed of a multi-combustor (10, multi-boiler) having a medium-to-large combustor capacity by connecting a plurality of combustor units (11, 12, 13, 14) in parallel.

According to the combustor apparatus cascade system 10, the plurality of

combustor units

11, 12, 13, and 14 can be installed according to a required capacity to expand or reduce the heating capacity, and if necessary, the plurality of combustion units Some or all of the

unit units

11, 12, 13, and 14 may be operated to provide heat required for heating and hot water generation and to save energy.

The combustion device 10 is connected to the main air supply line 20 for supplying air and the plurality of

combustion device units

11, 12, 13 and 14 branched from the main air supply line 20, respectively. Air supply lines (21,22,23,24), a main gas discharge line (30) through which combustion gas generated during combustion is discharged, and the plurality of combustion device units branched from the main gas discharge line (30)

Gas discharge lines

31, 32, 33, and 34 respectively connected to (11, 12, 13, 14) are provided.

In addition, the combustion device 10 is provided with a gas supply line (not shown) for supplying gas to the plurality of

combustion device units

11, 12, 13 and 14.

The plurality of

combustion device units

11, 12, 13, and 14 have a combustion chamber (not shown) in which gas is burned, and a heat exchanger (not shown) in which heat generated by heat exchange is performed using the flame generated in the combustion chamber as a heat source. A heating or hot water pipe (not shown) in which the heating medium heated in the heat exchanger flows to a heating or hot water required place (not shown) is connected.

In addition, an igniter (not shown) for igniting a flame in the gas supplied to each of the combustion chambers is provided in the plurality of

combustion unit units

11, 12, 13, and 14.

In addition, the plurality of combustion device units (11,12,13,14) are provided with blowers (51,52,53,54), respectively, and the rotational speed (RPM) of the blowers (51,52,53,54) ) To control the inflow of air and gas.

Accordingly, when any one of the plurality of

combustion device units

11, 12, 13, and 14 is operated, the

blowers

51, 52, 53, 54 of the corresponding combustion device unit are operated to operate the main air supply line 20 ) And the air supply line (21,22,23,24) connected to the combustion device unit and air and gas are introduced into the combustion device through the gas supply line, and the introduced air and gas are The ignition is ignited by the igniter, and a flame is generated in the combustion chamber, and the combustion gas is discharged to the main gas discharge line 30 through the

gas discharge lines

31, 32, 33, and 34 connected to the combustion device.

At this time, when any one of the plurality of combustion device units (11, 12, 13, 14) is operated, and the remaining combustion device units (12, 13, 14) are not operated, Combustion gas discharged from the combustion device unit 11 to the main gas discharge line 30 flows back through the

gas discharge lines

32, 33, and 34, and the

combustion device units

12, 13, and 14 in an unoperated state. A situation could be introduced into the combustion chamber.

That is, by the reverse flow of the combustion gas, a non-combustion atmosphere is formed in the combustion chamber where the combustion gas is introduced, and then, when the

combustion device units

12, 13, and 14 in which the combustion gas is introduced into the combustion chamber are operated, it is misfired or misfired. It became the cause of (원인火).

Accordingly, when some combustion device units are first operated in the combustion device cascade system, and when the generated combustion gas flows back to the remaining some combustion device units, misfire or misfire occurs, each combustion device unit automatically responds and performs re-ignition. And how to maintain the combustion state was researched

In addition, in general, in a combustion device in which the amount of gas is variablely controlled, such as a gas boiler, a turn-down ratio (TDR), which is a ratio between a maximum gas supply amount and a minimum gas supply amount, is fixedly set.

The maximum gas supply is the upper limit of the amount of gas supplied per hour to the combustion equipment, and is applied as the upper limit of the gas supplied when performing the combustion of the maximum thermal power to quickly reach the target heating or hot water temperature. The gas supply amount is the lowest limit value of the amount of gas per hour supplied to the combustion device, and is applied as the lower limit value of the gas supplied to maintain the combustion state with the minimum thermal power.

In general, the turndown ratio TDR is adjusted according to the minimum gas supply amount, the higher the minimum gas supply amount, the lower the turndown ratio TDR, and the lower the minimum gas supply amount, the higher the turndown ratio TDR.

At this time, the higher the turndown ratio (TDR), the higher the turn-down ratio (TDR) occurs, resulting in a misfire due to the lack of gas supply, and the lower the turn-down ratio (TDR), the lower the turn-down ratio (TDR), the fire power required to maintain the combustion state of the combustion device Excessive unnecessary combustion was performed, resulting in a problem that the thermal efficiency of the combustion device was reduced.

Accordingly, research has been conducted on a method of improving the thermal efficiency of the combustion device by maintaining the combustion state of the combustion device by adjusting the minimum gas supply amount but increasing the turndown ratio (TDR) as much as possible.

As a prior art related to the control of the turndown ratio (TDR), Korean Patent Registration No. 10-0805630 is disclosed.

The present invention has been devised to solve the above-mentioned problems, and has an object to provide a combustion apparatus and a combustion control method of a combustion apparatus and a combustion apparatus stably re-ignited and burned in response to misfire and misfire.

In addition, the object of the present invention is to provide a combustion device and a method for controlling combustion of a combustion device that can improve the thermal efficiency of the combustion device by maintaining the combustion state of the combustion device by adjusting the minimum gas supply amount, but increasing the turndown ratio (TDR) as much as possible. .

The combustion control method of the combustion apparatus of the present invention for solving the above-mentioned problems is: a) Some of the combustion apparatus units among the plurality of combustion apparatus units were in operation, and the combustion apparatus cascade system was not in operation. A step in which an operation command is input to at least one of the combustion unit units of the unit, and b) a step in which ignition is attempted when gas having a predetermined gas supply amount is supplied to the combustion unit unit to which the operation command is input, and c) whether or not ignition is successful. And determining the ignition success in the step c), d) maintaining the combustion state of the combustion device unit by setting the gas supply amount when the ignition is successful to be the minimum gas supply amount which is the lowest limit value of the gas supply amount. When performing the ignition determination in step c), e) increasing the gas supply amount of the gas supplied to the combustion unit, attempting ignition, and simultaneously determining whether ignition is successful, and step e) When determining the successful ignition, it is made to perform step d).

In addition, when the flame inside the combustion chamber is ignited during the operation of the combustion device unit and the combustion state is released, the step e) may be performed.

In addition, when the flame inside the combustion chamber is ignited and the combustion state is released, the gas supply amount at the time of occurrence of ignition is set as the ignition gas supply amount, and the step e) comprises a step of supplying a gas greater than the ignition gas supply amount to perform ignition. Can.

In addition, when the flame inside the combustion chamber is ignited and the combustion state is released, the post-purging step of exhausting the gas inside the combustion chamber for a predetermined time may be performed prior to performing step e).

In addition, in step e), the gas supply amount includes a plurality of periods that are kept constant for a certain period of time, but the gas supply amount of the succeeding period consists of a step of increasing by a predetermined amount than the gas supply amount of the preceding period, and ignition. Upon success, the process of maintaining the combustion state of the combustion device unit may be performed by stopping the progress of the plurality of times and setting the gas supply amount at the time of successful ignition as the minimum gas supply amount that is the lowest limit value of the gas supply amount.

In addition, it may be made to control the gas supply amount by adjusting the rotational speed of the blower that sucks gas and flows into the combustion device unit.

In addition, the control unit may be configured to determine whether the ignition is successful or not by receiving the detection information of the flame detector that detects the presence or absence of flame in the combustion chamber.

In addition, when the total amount of the execution time for performing the step e) exceeds the maximum ignition attempt time, which is the predetermined maximum limit value, operation of the igniter and gas supply may be stopped and error processing may be performed.

The combustion device cascade system comprising a plurality of combustion device units according to the present invention attempts to ignite by supplying gas at a predetermined gas supply amount to the combustion device unit, but increases the gas supply amount of the gas supplied when determining non-ignition. It is made to include the control unit to control the ignition again, and to maintain the combustion state with the minimum gas supply when the ignition is successful.

In addition, when the flame inside the combustion chamber is ignited during operation of the combustion device and the combustion state is released, the control unit may increase the gas supply amount of the supplied gas to attempt to ignite the combustion chamber again.

In addition, when determining the ignition success, the minimum gas supply amount previously set in the control unit may be updated to be updated to the gas supply amount upon successful ignition.

In addition, the control unit may be configured to perform a post-purging step of exhausting the gas inside the combustion chamber for a predetermined time prior to attempting to ignite again after the occurrence of misfire.

According to the combustion apparatus and the combustion control method of the combustion apparatus according to the present invention, when the ignition is attempted, the gas supply amount is adjusted to automatically satisfy the gas supply amount required for ignition, so that the ignition can be stably provided to stably provide heating or hot water.

In addition, by increasing the gas supply gradually until ignition is successful, attempting ignition to check the minimum gas supply for combustion, and setting the gas supply at the time of successful ignition to the minimum gas supply to increase the turndown ratio (TDR) to maximize the efficient heating. Alternatively, hot water may be provided.

In addition, it is possible to automatically re-ignition when a fire occurs, thereby maintaining the combustion state of the combustion device and providing stable heating or hot water.

In addition, it is possible to prevent an explosion from being generated in a dense gas atmosphere and exhaust the gas inside the combustion chamber prior to the re-ignition during the fire, so that the re-ignition can be safely performed.

In addition, it is possible to prevent the explosion from occurring in a dense gas atmosphere by limiting the total amount of time for ignition.

1 is a view schematically showing the configuration of a combustor cascade system according to the prior art.

Figure 2 is a flow chart showing a combustion control method of a combustion apparatus according to the present invention.

3 is a graph showing a combustion control method of a combustion device according to the present invention.

** Explanation of sign **

R1: 1st time R2: 2nd time

R3: 3rd time T1: 1st holding time

T2: Second holding time T3: Third holding time

Tmax: Maximum ignition attempt time Tp: Post purge holding time

V1: 1st rotation speed V2: 2nd rotation speed

V3: 3rd rotation speed Vmax: Maximum rotation speed

Vmin: Minimum rotation speed Voff: Actual rotation speed

Vp: Post purge rotation speed 600: Successful ignition

700: true fire 800: successful reignition

Hereinafter, a combustion apparatus and a combustion control method of the combustion apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

Here, the detailed description of the contents described in the prior art and the overlapping contents will be omitted, and the components newly added to the present invention will be mainly described.

The combustion device (not shown) according to the present invention is a gas combustion device that provides heating or hot water by burning gas, and may be a cascade system Apparatus for Combustion in which a plurality of combustion device units are connected in parallel. .

The combustion device may be a boiler that provides heating or hot water, or may be a water heater that provides hot water.

The combustion device unit includes a combustion chamber (not shown) in which gas is burned, a gas supply line (not shown) for supplying gas to the combustion device unit, and an air supply line (not shown) for supplying air to the combustion device unit. And, a gas discharge line (not shown) for discharging the gas inside the combustion chamber is provided, and a blower (not shown) for supplying a mixture of gas and air supplied through the gas supply line and the air supply line to the combustion chamber , A burner (not shown) for burning the mixer to generate a flame is provided.

In addition, the burner is provided with an igniter (not shown) for igniting a flame on the supplied gas.

The igniter may be configured to generate sparks by applying high voltage to the ends of the electrode rods.

In addition, a flame detector (not shown) for detecting flame inside the combustion chamber is provided in the combustion device.

The flame detector may be composed of an optical sensor that detects light generated from a flame inside the combustion chamber through a flame detection window provided on a wall surrounding the combustion chamber, and the flame inside the combustion chamber is irrespective of the steps of the combustion control method described later. It can be made to continuously detect the presence and absence of combustion.

The igniter, the blower and the flame detector are connected to a control unit of the combustion device unit.

The control unit is configured to control the combustion state of the combustion device unit by receiving the detection information of the flame detector, determining the presence or absence of flame inside the combustion chamber, and controlling the operation of the igniter and the blower.

The control of the combustion state of the control unit aims to efficiently provide heating or hot water at a temperature set by the user.

The control unit controls the rotational speed (RPM) of the blower to adjust the gas supply amount, which is the amount of gas per hour flowing into the combustion chamber, and the gas supply amount is proportional to the rotational speed (RPM) of the blower.

In the control unit, a maximum gas supply amount, which is a maximum limit value of a gas supply amount, and a minimum gas supply amount, which is a minimum limit value, may be set, and a maximum rotation speed that is the rotational speed (RPM) of the blower for supplying the gas of the maximum gas supply amount. (Vmax) and a minimum rotational speed (Vmin) that is the rotational speed (RPM) of the blower for supplying the gas of the minimum gas supply amount may be set.

The combustion control method of the combustion apparatus according to the present invention will be described with reference to FIGS. 2 and 3.

2 is a flow chart showing a method for controlling combustion of a combustion apparatus according to the present invention, and FIG. 3 is a graph showing a change in the rotational speed (RPM) of a blower controlled by the present invention.

The present invention relates to a remaining part of the combustion device unit that was in an unoperated state while some of the combustion device units constituting the combustion device cascade system are operating, and the combustion device unit in the following description. Means any one of the above ``the remaining part of the combustion apparatus unit that was not in operation''.

Step S10 is a step of attempting ignition as the combustion device unit is activated.

When the operation command of the combustion device unit is input, the control unit of the combustion device operates a blower to introduce gas and air into the combustion device unit from a gas supply line and an air supply line, and operates an igniter to cause a flame in the combustion chamber. Try to ignite.

At this time, the gas flowing into the combustion device unit is supplied at a preset minimum gas supply amount Tmin, and for this purpose, the blower is operated at a preset minimum rotation speed Vmin.

The ignition attempt of the igniter may be made at least once during a predetermined time (T0), and the predetermined time (T0) may be preset to the control unit in consideration of a time required for a sufficient amount of gas to reach the igniter. have.

Step S20 is a step of determining whether or not the combustion chamber is ignited by the control unit, and the present step S20 is performed in parallel while the step S10 is performed.

The control unit receives the detection information of the flame detector to determine whether or not ignition is performed, and when determining the ignition, performs step S30, which will be described later, and performs step S60, which is described later, when determining the ignition success.

Step S30 is a step of attempting ignition again.

The control unit is configured to increase the gas supply amount by increasing the rotational speed (RPM) of the blower until ignition is achieved.

To this end, the step S30 may consist of a primary period R1 in which the rotational speed RPM of the blower is kept constant for the first holding time T1, which is a predetermined time at the first rotational speed V1. .

The primary timing R1 is a period during which secondary ignition is attempted in this step S30 after the initial ignition attempt, and the first rotation speed V1 may have a value equal to or greater than the minimum rotation speed Vmin. The ignition rotation speed increase amount G0, which is a difference value between the minimum rotation speed Vmin and the first rotation speed V1, may be set in the control unit.

As described above, after the ignition is attempted while the rotational speed (RPM) of the blower is increased, the process proceeds to step S40.

Step S40 is a step of determining whether the combustion chamber is ignited by the control unit, which is the same as the step S20, but is performed in parallel while the step S30 is being performed.

The control unit determines whether or not ignition is received by receiving the detection information of the flame detector while the primary period R1 is in progress.

The control unit performs step S50 when ignition is successful, and performs step S100 when ignition is successful.

In step S100, it is determined whether the maximum ignition attempt time has been exceeded. The maximum ignition attempt time (Tmax) refers to the maximum limit value of the time during which gas is supplied in a state in which ignition is not performed by performing steps S30 and S40. As a result of the determination, if the ignition attempt time does not exceed the maximum ignition attempt time, the process proceeds to step S30 again.

Subsequently, the process described in S30 is repeated, and at least once in the second period R2 in which the rotational speed RPM of the blower is maintained at the second rotational speed V2 for the second holding time T2. Ignition attempt is made. In this case, the second rotation speed V2 has a value increased by the first increase amount G1 from the first rotation speed V1. Thereafter, as a result of determining whether or not ignition is performed in S40, the process of Step S30 is repeated through the step S100 after the ignition fails again.

In addition, if the ignition fails in the second time period R2, the rotational speed RPM of the blower is increased from the second rotational speed V2 to the third rotational speed V3 having a value increased by the second increase amount G2. At least one ignition attempt is made in the third period R3 maintained for the third holding time T3.

The control unit may be set to increase the rotation speed between the plurality of periods (R1, R2, R3) including the first increase amount (G1) and the second increase amount (G2), the rotation speed increase amount of the blower (G0, G1, G2) may be set to the same value.

That is, according to the present invention, the ignition is stably performed and the heating or hot water can be stably provided by automatically adjusting the gas supply amount during an ignition and attempting ignition again.

In addition, by increasing the gas supply amount until ignition is successful, ignition is attempted with the minimum gas supply amount for ignition and combustion, thereby reducing unnecessary waste of gas and checking the minimum gas supply amount for ignition and combustion. Can.

In addition, a maximum ignition attempt time Tmax, which is a maximum limit value of the time at which the ignition attempt is performed, may be set in the control unit.

The controller, in parallel with the step S30 and the step S40, may determine whether the maximum ignition attempt time Tmax is exceeded (step S100), and the holding time of the plurality of times R1, R2, R3 If the ignition is not performed such that the total amount of the execution time of the step S30 including (T1, T2, T3) exceeds the maximum ignition attempt time (Tmax), the operation of the igniter and the blower is stopped and error processing ( Step S110).

The maximum ignition attempt time (Tmax) is to prevent an excessively high gas density inside the combustion chamber due to an ignition delay or the like, and to prevent an explosion from occurring in a dense gas atmosphere.

Step S50 is a step in which the combustion chamber is ignited and the minimum gas supply amount set in the control unit is updated to the gas supply amount when the ignition is successful (600).

At this time, since the control unit controls the blower to adjust the gas supply amount, in step S50, the minimum rotational speed Vmin set in the control unit is updated to the rotational speed (RPM) of the blower when the ignition is successful (600). It can be a step.

For example, when ignition is performed while performing the third period R3 of the step S30, the rotation speed (RPM) of the blower when the ignition is successful (600) becomes the third rotation speed (V3), The value of the minimum rotational speed Vmin set in the control unit is updated to the value of the third rotational speed V3.

That is, according to the present invention, it is possible to check the minimum gas supply amount for combustion by gradually increasing the gas supply amount until the ignition is successful (600) (step 40), and the gas at the time of ignition success (600). By setting the supply amount to the minimum gas supply amount, it is possible to maintain combustion by consuming minimal gas without unnecessary waste.

Therefore, it is possible to provide efficient heating or hot water by increasing the turndown ratio (TDR) as much as possible within a range capable of maintaining the combustion state of the combustion device unit in which combustion gas is reversed.

Step S60 is a step of maintaining the combustion state to correspond to the heating load or hot water load currently required. That is, when using heating or hot water, the combustion device may be turned on or off according to a set temperature.

At this time, the gas supply amount for the heating load or the hot water load is maintained between the minimum gas supply amount and the maximum gas supply amount, and for this purpose, the rotation speed (RPM) of the blower is the minimum rotation speed (Vmin) and the maximum rotation It is maintained between the speeds Vmax.

In addition, when the rotational speed (RPM) of the blower is smaller than the minimum rotational speed (Vmin), a fire may occur and the combustion state inside the combustion chamber may be released, so the rotational speed (RPM) of the blower is the minimum rotational speed. It is controlled to maintain (Vmin) or higher.

That is, the control unit may control the gas to be burned with the minimum thermal power required to maintain the target temperature and maintain the combustion state inside the combustion chamber, thereby preventing unnecessary gas consumption and increasing the thermal efficiency of the combustion device.

Step S70 is a step of determining whether the inside of the combustion chamber is misfired by the control unit, and this step S70 is performed in parallel while the step S60 is performed.

The control unit receives the detection information of the flame detector, determines whether the flame is in the combustion chamber, and performs a step S80, which will be described later when the fire occurs (700).

At this time, when the misfire occurs, the gas supply amount of 700 is called the misfire gas supply amount, and the rotation speed (RPM) of the blower when the misfire occurs 700 is stored in the control unit as the misfire rotation speed Voff or the actual gas supply amount. .

Step S80 is a post-purging step for discharging the gas inside the combustion chamber.

The post-purging step is to prevent a state in which an additional gas is supplied into the combustion chamber in which the combustion state is released due to misfire and the gas density inside the combustion chamber is excessively increased. This is a step to prevent an explosion from occurring in a dense gas atmosphere by performing a purge step.

To this end, the control unit operates the blower to push out the combustion gas inside the combustion chamber and discharge it to the gas discharge line.

At this time, the control unit may control the valve that opens and closes the gas supply line to close the gas supply line and operate the blower in a state in which only the air supply line is open, whereby the air supplied into the combustion chamber is a combustion gas. It can be made to push the purge.

At this time, the blower maintains the post-purge rotation speed Vp to supply air at a constant post-purge air supply, and is operated during the post-purge retention time Tp, so that the purge can be stably performed.

The post-purge retention time Tp and the post-purge rotation speed Vp may be preset in the control unit, and the post-purge retention time Tp may be set to 10 to 20 seconds, and the post-purge rotation The speed Vp may be set to a value smaller than the minimum rotational speed Vmin.

Step S90 is a step of determining whether the misfire has occurred and determining whether the combustion device is stopped.

The control unit may be configured to stop operation of the combustion device when the misfire occurs according to a determination of the termination of the control unit due to a user's termination command or other cause.

In addition, if the occurrence of the misfire is not according to the user's termination command or the termination determination of the controller, the controller is configured to repeat the combustion control method of step S30 or less.

That is, according to the present invention, by automatically re-igniting when a fire occurs, the combustion state of the combustion chamber is maintained and heating or hot water is stably maintained.

The re-ignition attempt may be performed immediately after the post-purging step of step S80 is completed, or may be performed at regular time intervals.

At this time, in the step S30 of attempting re-ignition when a misfire occurs, the first rotation speed V1' of the primary period R1' attempting to re-ignition has a value greater than or equal to the misfire rotation speed Voff. Can.

To this end, an increase amount G0', which is a difference value between the misfire rotation speed Voff and the first rotation speed V1', may be set in the control unit, and the first rotation speed V1' ) Is a value obtained by adding the re-ignition rotation speed increase amount G0' to the misfire rotation speed Voff.

In addition, upon successful re-ignition (800), in step S50, the minimum rotational speed Vmin is updated to a value equal to or greater than the actual rotational speed Voff.

In one example, when re-ignition is performed at the second time R2' for attempting re-ignition, the rotation speed V of the blower at the time of successful re-ignition 800 is determined from the first rotation speed V1'. Since the second rotation speed V2' increased by the third increase amount G3, and the minimum rotation speed Vmin is updated to the second rotation speed V2', the minimum rotation speed is the actual rotation speed ( Voff) is updated by adding the re-ignition rotation speed increase amount G0' and the third increase amount G3.

That is, according to the present invention, when ignition occurs, re-ignition is automatically performed, but when the re-ignition is successful, the gas supply amount of the 800 is set to the minimum gas supply amount to consume minimal gas without unnecessary waste, thereby maintaining combustion. It is possible to provide efficient heating or hot water by increasing the turndown ratio (TDR) as much as possible within a range capable of maintaining the combustion state of the unit.

As described above, according to the combustion apparatus and the combustion control method of the combustion apparatus according to the present invention, when the ignition is attempted, the gas supply amount is adjusted to automatically satisfy the gas supply amount required for ignition to stably ignite and provide heating or hot water stably. can do.

In addition, the gas supply amount is gradually increased until the ignition is successful (600,800), and the ignition is attempted to check the minimum gas supply for combustion, and when the ignition is successful (600,800), the gas supply is set to the minimum gas supply to turn-down ratio (TDR) By increasing as much as possible, it is possible to provide efficient heating or hot water.

The present invention is not limited to the above-described embodiments, and it is possible to carry out obvious modifications by those skilled in the art to which the present invention pertains without departing from the technical spirit of the present invention as claimed in the claims. The practice is within the scope of the present invention.

Claims

a) a combustor cascade system in which only a part of combustor units among a plurality of combustor units are in operation, the operation command being input to at least one combustor unit among the remaining combustor units that are not in operation;

b) supplying a gas having a predetermined gas supply amount to the combustion device unit to which an operation command is input, and attempting ignition;

c) determining whether the ignition is successful;

When determining the ignition success in step c), d) maintaining the combustion state of the combustion device unit by setting the gas supply amount upon successful ignition as the minimum gas supply amount which is the lowest limit value of the gas supply amount; And

When determining the ignition in step c), e) increasing the gas supply amount of the gas supplied to the combustion device unit to attempt ignition to determine whether or not ignition was successful. ) Combustion control method of a combustion device configured to perform.
According to claim 1,

When the flame inside the combustion chamber is ignited during the operation of the combustion device unit and the combustion state is released, the step e) is performed.
According to claim 2,

When the flame inside the combustion chamber is ignited and the combustion state is released, the gas supply amount at the time of occurrence of ignition is set as the ignition gas supply amount;

The step e) is a combustion control method for a combustion device, characterized in that the step of performing ignition by supplying a gas greater than the amount of the ignition gas supplied.
According to claim 2,

When the flame inside the combustion chamber is ignited and the combustion state is released, prior to performing the step e), a post-purging step of exhausting the gas inside the combustion chamber for a predetermined period of time is performed.
According to claim 1,

In step e), the gas supply amount includes a plurality of periods in which the constant amount is maintained for a certain period of time, and the gas supply amount in the succeeding period consists of a step of increasing by a predetermined amount than the gas supply amount in the preceding period;

When the ignition is successful, stopping the progress of the plurality of times and maintaining the combustion state of the combustion unit by setting the gas supply amount when the ignition is successful to be the minimum gas supply amount that is the lowest limit value of the gas supply amount. Method for controlling combustion of combustion equipment.
According to claim 1,

A method for controlling combustion of a combustion device, characterized in that a gas supply amount is controlled by adjusting a rotation speed of a blower that sucks gas and flows into the combustion device unit.
According to claim 1,

A control method for combustion of a combustion device, characterized in that the control unit determines whether the ignition is successful or not by receiving the detection information of the flame detector that detects the presence or absence of flame inside the combustion chamber.
The method of claim 5,

If the total amount of the execution time to perform the step e) exceeds the maximum ignition attempt time, which is the predetermined maximum limit value, the combustion control of the combustion device is characterized in that the operation of the igniter and the gas supply are stopped and the error is processed. Way.
In a combustor cascade system in which only a part of the combustor units among the plurality of combustor units are in an active state and the remaining part of the combustor units is in an unoperated state, it is operated in at least one combustor unit among the combustor units that are in an unactivated state. If a command is entered,

The ignition is attempted by supplying gas at a predetermined gas supply amount to the combustion unit, but the ignition is attempted again by increasing the gas supply amount of the supplied gas when the ignition is judged. Combustion apparatus including a control unit for controlling to maintain the combustion state with the gas supply amount.
The method of claim 9,

When the flame inside the combustion chamber is ignited during the operation of the combustion device and the combustion state is released, the control unit increases the gas supply amount of the supplied gas and attempts to ignite the inside of the combustion chamber again.
The method of claim 9,

When determining the ignition success, the combustion apparatus characterized in that the minimum gas supply amount previously set in the control unit is updated to the gas supply amount upon successful ignition.
The method of claim 10,

The control unit is configured to perform a post-purge step of exhausting the gas inside the combustion chamber for a predetermined time prior to attempting to ignite again after the occurrence of ignition.