KR101562241B1 - An exhaust temperature sensor of the combustion device, Every detection method - Google Patents

Abstract

The present invention relates to a method to detect removal of an exhaust temperature sensor of a combustion device. The method of the present invention comprises the steps of: continuously determining if there is a fire extinguishing order during a combustion heat quantity control for a burner in a control unit within a combustion device; starting a post fan control for a fan during a determined time after extinguishing the fire of the burner if there is a fire extinguishing order; performing the post fan control for the fan, and detecting an exhaust temperature (T11°C) within an exhaust pipe through an exhaust temperature sensor right after extinguishing the fire of the burner; determining if a first time (A seconds) memorized by a memory in the control unit has passed; detecting an exhaust temperature (T12°C) again when the first time (A seconds) has passed; determining if the value obtained by subtracting the exhaust temperature right after the first time (A seconds) has passed (T12°C) from the exhaust temperature right after extinguishing the fire (T11°C) is greater than a first standard temperature (T1 °C); and, if the value (T11°C - T12°C) is greater than the first standard temperature (T1°C), entering the normal combustion waiting status after fire extinguishing. As such, the method of the present invention prevents a malfunction of control and an abnormal stoppage due to a detection error of the exhaust temperature which occurs due to a defective installation of the exhaust temperature sensor or the like, and prevents damage to the product due to heating of the product. The method of the present invention also prevents an incomplete combustion due to removal of the exhaust temperature sensor located in an airtight unit, and greatly improves the marketability of the combustion device itself and the reliability in accordance to operation.

Description

[0001] The present invention relates to an exhaust temperature sensor of a combustion device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an exhaust temperature detecting sensor drop detecting method for a combustion apparatus, and more particularly, to a combustion apparatus having an exhaust temperature detecting sensor such as a boiler, If the normal temperature and the abnormal temperature change are detected, the normal temperature and the abnormal temperature are detected. If there is an abnormality, if the temperature of the exhaust temperature detection sensor is missed at the time when the post fan is terminated secondarily So that it is possible to prevent the malfunction and the abnormal stop of the control due to the erroneous detection of the exhaust temperature detection sensor and to prevent the damage of the product due to the heating of the product, In order to prevent incomplete combustion due to disconnection of the exhaust temperature detecting sensor located inside, the exhaust temperature The present invention relates to a detection sensor drop detection method.

Generally, a combustion device includes a boiler which uses combustion heat and electric heat generated by using oil, coal and gas as a fuel and burning it or supplying electricity to a heater, Refers to a facility for boiling water in order to supply water to various heating facilities by heating the water. In the case of a domestic boiler, it is used to supply hot water to the piping installed on the floor of the room, or to supply hot water through a water pipe ought.

When the heating mode is operated in the heating / hot water boiler, the circulation pump is operated to transfer the heating water, and the heating water is heated in the main heat exchanger to be supplied to the heating load (i.e., heating pipe) Heating is carried out.

In addition, the supply of the hot water blocks the path from the three-way valve to the heating load side and opens the path to the hot water heat exchanger side to transfer the heated water heated in the main heat exchanger to the hot water heat exchanger side, Heat exchange can be performed between the heating water and the hot water to be supplied to the user.

On the other hand, in a state where the exhaust temperature detecting sensor installed for improving the safety and performance of the combustion device is normally attached to the inside of the component of the air-tight combustion device, there is no problem in the control of the combustion device stably. However, If it is assembled or abnormally released from the attachment position, it may cause an abnormality such as stoppage or overheating due to malfunction of the exhaust temperature control.

That is, when the exhaust temperature detection sensor is separated from the attachment position due to misassembly or abnormality, the exhaust gas flows back into the airtightness component portion and incomplete combustion occurs, so that not only the exhaust temperature during combustion but also the airtightness due to the radiation heat of the combustion chamber and heat exchanger In order to determine whether the exhaust temperature detection sensor detects the temperature at the normal position or is detached and detects any one of the airtight structure as the temperature inside the inside portion rises, the specifications must be determined with various test results , A change in temperature is not constant, and malfunction may occur.

However, most of the conventional combustion apparatuses are configured such that detection can not be performed even if the exhaust temperature sensor is released from the attachment position, so that a malfunction occurs in the control using the exhaust temperature detection sensor, There is a problem that CO is increased due to incomplete combustion and the service life of the product is shortened.

Korean Patent Publication No. 2000-0043541 (July 15, 2000) Korean Patent Publication No. 10-2013-0126116 (November 20, 2013)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an exhaust temperature detecting sensor for detecting a temperature of an exhaust gas in a combustion chamber, If there is an abnormality, check the normal temperature of the exhaust temperature detection sensor and the temperature change when the post fan is terminated at the second time It is possible to prevent malfunction and abnormal stop of control due to erroneous detection of the exhaust temperature detection sensor, to prevent damage to the product due to heating of the product, and to prevent exhaust temperature detection There is provided an exhaust temperature detection sensor drop detection method of a combustion apparatus capable of preventing incomplete combustion due to dropout of a sensor It is an object.

According to another aspect of the present invention, there is provided a method for controlling a burner, the method comprising the steps of: Initiating post fan control of the blower fan for a predetermined period of time after extinguishing the burner if there is an extinguishing instruction; (T11 DEG C) of the exhaust pipe immediately after extinguishing the burner through the exhaust temperature detecting sensor while performing post-fan control on the blowing fan; Determining whether a first time (A seconds) stored in the storage device in the control unit has elapsed; Detecting the exhaust temperature (T12 DEG C) in the exhaust pipe once the first time (A seconds) has elapsed; Determining whether a value obtained by subtracting the exhaust temperature (T12 DEG C) after the lapse of the first time (A seconds) from the exhaust temperature (T11 DEG C) immediately after the fire extinguishment is greater than a predetermined first reference temperature (T1 DEG C); (T11 DEG C - T12 DEG C)> If the predetermined first reference temperature (T1 DEG C) is satisfied, the exhaust temperature detection sensor installed in the airtight portion recognizes as a normal state and enters the normal combustion standby state after extinguishing do.

As a result of judging whether or not the value obtained by subtracting the exhaust temperature (T12 DEG C) after the lapse of the first time (A second) from the exhaust temperature (T11 DEG C) immediately after extinguishing is greater than the first predetermined reference temperature (T1 DEG C) Determining whether the post-fan control time (t) for the fan has ended; When the post-fan control time (t) of the blowing fan is terminated, detecting an exhaust pipe exhaust temperature (T21 DEG C) at that time point; Determining whether a second time (B seconds) stored in the storage device in the control unit has elapsed; Detecting the exhaust temperature (T22 DEG C) in the exhaust pipe again when the second time (B seconds) elapses; Determining whether a value obtained by subtracting an exhaust temperature (T22 占 폚) after a second time (B seconds) has elapsed from an exhaust temperature (T21 占 폚) immediately after the post fan termination is greater than a second predetermined reference temperature (T2 占 폚); (T21 占 폚 - T22 占 폚) If the predetermined second reference temperature (T2 占 폚) is satisfied, the exhaust temperature detection sensor installed in the airtight portion recognizes the normal state and enters the normal combustion standby state after extinguishing do.

On the other hand, if it is determined that the value obtained by subtracting the exhaust temperature (T22 占 폚) after the elapse of the second time (B seconds) from the exhaust temperature (T21 占 폚) immediately after the end of the post fan is greater than the predetermined second reference temperature And displaying an error indicating that the exhaust temperature detection sensor is missing on the display unit provided in the temperature control unit and the exhaust temperature of the exhaust pipe is not accurately detected.

In addition, after the error is displayed on the display unit, the control unit further performs a step of stopping each component of the combustion apparatus safely.

At this time, the first time (A seconds) determined after the burner is extinguished and the second time (B seconds) determined after the post fan is set are set between 10 and 20 seconds corresponding to the combustion device capacity, ) And the second time (B second) are set to be different from each other.

The predetermined first reference temperature T1 占 폚 and the second reference temperature T2 占 폚 are set between 0 占 폚 and 10 占 폚 corresponding to the combustion device capacity, (T2) are set at different temperatures.

Further, the post-fan control time for the blowing fan, which is performed after the burner is extinguished, is set to 2 to 3 minutes.

In this case, when the post fan is controlled, the driving control of the blowing fan has a rotation speed of 40 to 50% of the maximum rotation speed.

As described above, according to the exhaust temperature detection sensor drop detection method of a combustion apparatus of the present invention, in a variety of combustion devices provided with an exhaust temperature detection sensor, when exhaust gas is exhausted after a certain period of time after combustion, The normal temperature and the abnormal temperature should be distinguished from the normal temperature of the sensor and the abnormal temperature. If there is an abnormality, the normal temperature of the exhaust temperature detecting sensor at the time when the post fan finishes secondarily, It is possible to prevent the malfunction and the abnormal stop of the control due to the detection of the exhaust temperature error which may occur due to the installation failure of the exhaust temperature detection sensor or the like, And it is possible to prevent incomplete combustion due to disconnection of the exhaust temperature detecting sensor located inside the airtight portion As well as a very useful inventions, etc., which can dramatically improve the reliability of the products and the operation of the combustion unit itself.

1 is a schematic block diagram of a combustion device (boiler) to which the method of the present invention is applied;
2 is a flow chart for explaining the method of the present invention.
FIG. 3 is a graph showing a relationship between an abnormal state of the exhaust gas temperature in the exhaust pipe of the combustion apparatus (boiler) to which the present invention is applied and a temperature change in a steady state.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram of a combustion device (boiler) to which the method of the present invention is applied. FIG. 2 is a flow chart for explaining the method of the present invention. Of the exhaust temperature in the exhaust pipe and a steady-state temperature change of the exhaust pipe.

According to the present invention,

(S1) of continuously determining whether there is a fire extinguishing instruction while controlling the combustion heat quantity for the burner being burned in the control unit (4) of the combustion apparatus;

(S2) of starting post-fan control for the blowing fan (51) for a predetermined time (t) after extinguishing the burner if there is an extinguishing instruction;

(S3) of detecting the exhaust pipe internal exhaust temperature (T11 DEG C) immediately after extinguishing the burner through the exhaust temperature detecting sensor (8) while performing post-fan control on the blowing fan (51);

(S4) judging whether an elapsed time since the burner has been extinguished has passed a first time (A seconds) stored in the storage device (42) in the control unit (4);

(S5) again detecting the exhaust temperature (T12 DEG C) in the exhaust pipe when the first time (A second) has elapsed;

(T11 DEG C - T12 DEG C) after the first time (A seconds) elapses from the exhaust temperature (T11 DEG C) immediately after the fire extinguishment to the exhaust gas temperature (T12 DEG C) ) ≫ determined first reference temperature (T1 DEG C)) (S6);

(T11 DEG C - T12 DEG C)> If the predetermined first reference temperature (T1 DEG C) is satisfied, it is recognized that the exhaust temperature detection sensor 8 installed in the airtight portion is in a normal state, ). ≪ / RTI >

If it is determined in step S6 that the value obtained by subtracting the exhaust temperature T12 DEG C after the elapse of the first time (A seconds) from the exhaust temperature T11 DEG C immediately after the extinguishment is greater than the first reference temperature T1 DEG C As a result of judgment,

(S7) judging whether the post-fan control time (t) for the air blowing fan (51) is finished if it is not large;

When the post-fan control time t of the blowing fan 51 is terminated, a step S8 of detecting the exhaust pipe exhaust temperature T21 ° C at that time point;

(S9) of judging whether a second time (B seconds) stored in the storage device (42) in the control section (4) has elapsed since the end of the post fan on the blowing fan (51);

(S10) detecting the exhaust temperature (T22 DEG C) in the exhaust pipe again when the second time (B seconds) elapses;

(T21 占 폚 -? T) is greater than a second reference temperature (T2 占 폚) obtained by subtracting the exhaust temperature (T22 占 폚) from the exhaust temperature (T21 占 폚) T22 DEG C) > predetermined second reference temperature (T2 DEG C)) (S11);

(T21 占 폚 - T22 占 폚) If the determined second reference temperature (T2 占 폚) is satisfied, it is recognized that the exhaust temperature detection sensor 8 provided in the airtight portion is in a normal state, ). ≪ / RTI >

On the other hand, if the value obtained by subtracting the exhaust temperature (T22 deg. C) after the lapse of the second time (B seconds) from the exhaust temperature (T21 deg. C) As a result,

(S13) indicating an error indicating that the exhaust temperature detection sensor 8 has escaped and the exhaust temperature of the exhaust pipe can not be accurately detected is displayed on the display unit 71 provided in the temperature control device 7 .

Further, after displaying an error on the display unit 71 of the temperature regulating device 7, the control unit 4 further performs a step S14 of stopping the components of the combustion device safely.

At this time, the first time (A seconds) determined after the burner is extinguished and the second time (B seconds) determined after the post fan is terminated can be determined and changed according to the combustion device capacity. In the present invention, And the first time (A sec) and the second time (B sec) are set to different times, respectively.

The predetermined first reference temperature T1 占 폚 and the second reference temperature T2 占 폚 can be determined and changed corresponding to the combustion device capacity. In the present invention, the first reference temperature T1 占 폚 and the second reference temperature T2 占 폚 are set between 0 and 10 占 폚, (T1 ° C) and the second reference temperature (T2) are set at different temperatures, respectively.

Further, the post-fan control time t for the blowing fan 51, which is performed after the burner is extinguished, is set to 2 to 3 minutes.

In this case, the fan 51 is controlled to have a rotation speed of 40 to 50% with respect to the maximum number of rotations when the post fan is controlled.

The operation and effect of the method of the present invention having the above steps will be described as follows.

First, as shown in FIG. 1, a combustion device (boiler) to which the method of the present invention is applied includes an exhaust temperature detecting sensor 8 for detecting an exhaust temperature of a gas exhausted through an exhaust pipe, The control unit 4 including the hot water temperature detecting device 1, the ignition device 2, the flame detecting device 3, the calculating device 41 and the storage device 42, and the blowing fan 51 And a temperature control device 7 including a display portion 71 and the like including a gas supply drive device 6 for controlling the feed of the gas valve 61 and the like.

In the control unit 4 in the combustion device (boiler) having such a structure, as shown in FIG. 2, it is judged whether there is a fire fighting instruction during the combustion heat quantity control for the burner of the relevant combustion device being burned (S1) After the gas valve 61 is closed to extinguish the burner, the post fan control for the blowing fan 51 is started for a predetermined time t (S2).

At this time, post-fan control for the blowing fan 51 is performed by controlling exhaust gas remaining between the burner and the exhaust pipe in order to prevent the exhaust pipe from being deteriorated due to the high-temperature exhaust gas after the burning of the burner, The post-fan control time and the number of revolutions of the ventilating fan may be different depending on the capacity of the combustion device and the ventilating fan. The post-fan control time and the number of revolutions of the ventilating fan are The optimum value can be calculated and set through a large number of tests with respect to the capacity of the combustion apparatus and the blowing fan.

Therefore, in the present invention, the post-fan control time t for the blowing fan 51 after the burning of the burner is set to 2 to 3 minutes, and the rotational speed of the blowing fan 51 is set to 40 To < RTI ID = 0.0 > 50%. ≪ / RTI >

After the burner has been extinguished as described above, the control unit 4 controls the post-fan control of the blowing fan 51, as described above, Immediately after extinguishing, the exhaust temperature (T11 DEG C) in the exhaust pipe is detected (S3).

Subsequently, the control unit 4 continues to determine whether the elapsed time since the burner has been extinguished has exceeded the first time (A seconds) stored in the storage device 42 in itself, The exhaust temperature T12 DEG C is detected again (i.e., the exhaust temperature T12 DEG C is detected after the first time (A second) has elapsed) (S5).

Thereafter, in the arithmetic unit 41 of the control unit 4, the exhaust temperature T12 ° C detected after the first time (A second) elapses from the exhaust temperature (T11 ° C) detected immediately after the burner is extinguished is subtracted, And then determines whether the difference is greater than a first predetermined reference temperature T1 DEG C (i.e., (T11 DEG C - T12 DEG C) > predetermined first reference temperature T1 DEG C) (S6).

That is, when the post-fan control is performed on the blowing fan 51 after the burner is extinguished, the temperature drops due to a large change in the exhaust temperature discharged to the outside through the exhaust pipe. However, the temperature inside the airtightness- The difference between the exhaust temperature (T11 DEG C) immediately after the extinguishing and the exhaust temperature (T12 DEG C) after the lapse of the first time (A seconds) is calculated as the temperature change is small, and the difference is calculated as the first reference temperature (T1 占 폚) to determine whether or not the exhaust temperature detection sensor 8 has been removed.

If it is determined that the first reference temperature T1 is equal to (T11 DEG C - T12 DEG C) and> (T11 DEG C - T12 DEG C)> the first predetermined reference temperature T1 DEG (YES in S6) (4), the exhaust temperature sensor 8 installed in the airtight portion recognizes that it is in a normal state, and enters the normal combustion standby state after extinguishing (S12).

In the control unit 4, the value obtained by subtracting the exhaust temperature T12 DEG C after the elapse of the first time (A seconds) at the exhaust temperature (T11 DEG C) immediately after the extinguishment in the step S6 is set to a predetermined first reference temperature T1), it is determined whether the post-fan control time t for the blowing fan 51 has ended or not (S7).

That is, it is unstable to predict the abnormality of the exhaust temperature detection sensor 8 only by the change of the exhaust temperature immediately after the burner is extinguished. Therefore, the post fan control time for the blowing fan 51 t is terminated and driving of the blowing fan 51 is stopped, the exhaust temperature is detected again to determine whether the post-fan control time t for the blowing fan 51 has ended or not.

When the post-fan control time t of the blowing fan 51 is terminated and the driving of the blowing fan 51 is stopped as a result of the determination, the exhaust-pipe exhaust temperature T21 ° C at that time is detected (S8) .

The controller 4 continues to determine whether the elapsed time since the end of the post fan for the blowing fan 51 has passed the second time (B seconds) stored in the storage device 42 in itself (S9) (T22 DEG C) is detected again after the second time (B seconds) elapses (that is, when the exhaust temperature T22 DEG C is detected after the second time (B seconds) (S10) >

The calculation unit 41 in the control unit 4 subtracts the exhaust temperature T22 ° C detected after the second time (B seconds) elapses from the exhaust temperature (T21 ° C) detected immediately after the post fan is terminated, And then determines whether the difference is larger than a predetermined second reference temperature T2 ° C (i.e., (T 21 ° C - T 22 ° C)> predetermined second reference temperature T2 ° C) (S11).

That is, when the post-fan control for the blowing fan 51 is completed and the blowing fan 51 is stopped, the exhaust temperature does not change at the normal position, but the temperature inside the airtightness component increases due to the radiant heat Accordingly, in the present invention, the difference between the exhaust temperature (T 21 ° C) and the exhaust temperature (T 22 ° C) after the lapse of the second time (B seconds) immediately after the post-fan control for the blowing fan is finished is calculated, And the second reference temperature (T2 DEG C), it is accurately judged whether or not the exhaust temperature detection sensor 8 has been removed. At this time, since the change in the exhaust temperature in the exhaust pipe does not occur suddenly, B seconds), the exhaust temperature T12 is confirmed.

If it is determined that the second reference temperature T2 占 폚 is> (T21 占 폚 - T22 占 폚), the control unit 4 determines that the second reference temperature T2? The control unit 4 recognizes that the exhaust temperature detection sensor 8 installed in the airtight portion is in the normal state and enters the normal combustion standby state after the fire extinguishing (S12).

At this time, the first time (A seconds) determined after the burner is extinguished and the second time (B seconds) determined after the post fan is terminated can be determined and changed according to the combustion device capacity. In the present invention, , And the first time (A sec) and the second time (B sec) are set to different times.

The predetermined first reference temperature (T1 ° C) and the second reference temperature (T2 ° C) can also be determined and changed according to the combustion device capacity. In the present invention, the first reference temperature (T1 ° C) T1 < / RTI > C) and the second reference temperature < RTI ID = 0.0 > T2 < / RTI >

As a result of judging whether or not the second reference temperature T2 占 폚 is in a large state in the control section 4 (T21 占 폚 - T22 占 폚), the second time (B seconds) If the value obtained by subtracting the exhaust temperature (T22 DEG C) after the elapsed time is not larger than the predetermined second reference temperature T2 DEG C (No in S11), an error is displayed on the display unit 71 provided in the temperature regulating device 7 (S13) so that the user or the like can know that the exhaust temperature detection sensor 8 has escaped and the exhaust temperature of the exhaust pipe can not be accurately detected.

In addition, after the control unit 4 displays an error on the display unit 71 of the temperature control device 7 as described above, the control unit 4 stops the components of the combustion device safely (S14 ).

3 is a graph showing an abnormal state (dotted line) of the exhaust temperature and a temperature change in the steady state (solid line) due to the exhaust sensor 8 in the combustion apparatus (boiler) to which the present invention is applied.

As described above, according to the present invention, it is possible to prevent the malfunction and the abnormal stop of the control due to the exhaust temperature erroneous detection which may occur due to the installation failure of the exhaust temperature detecting sensor 8 provided in the surface combustion device, In addition, it is possible to prevent the incomplete combustion due to the exhaust temperature detecting sensor located inside the airtight portion. In particular, the reliability of the combustion device itself and the reliability of the combustion device itself can be greatly improved.

1: tapping temperature detection device
2: Ignition device
3: Flame detector
4:
41: computing device 42: storage device
5: blower fan drive device 51: blower fan
6: gas supply drive device 61: gas valve
7: Temperature control device 71: Display
8: Exhaust temperature detection sensor

Claims (8)

Continuously determining whether there is a fire extinguishing instruction while controlling the combustion heat quantity for the burner in the control unit in the combustion apparatus;
Initiating post fan control of the blower fan for a predetermined period of time after extinguishing the burner if there is an extinguishing instruction;
(T11 DEG C) of the exhaust pipe immediately after extinguishing the burner through the exhaust temperature detecting sensor while performing post-fan control on the blowing fan;
Determining whether a first time (A seconds) elapses;
Detecting an exhaust temperature (T12 DEG C) again when a first time (A seconds) has elapsed;
Determining whether a value obtained by subtracting the exhaust temperature (T12 DEG C) after the first time (A seconds) elapses from the exhaust temperature (T11 DEG C) immediately after the digestion is greater than a first reference temperature (T1 DEG C);
(T 11 ° C - T 12 ° C)> the first reference temperature (T 1 ° C), entering the normal combustion standby state after extinguishing.
The method according to claim 1,
As a result of judging whether or not the value obtained by subtracting the exhaust temperature (T12 DEG C) after the lapse of the first time (A second) from the exhaust temperature (T11 DEG C) immediately after the fire extinguishing is greater than the first reference temperature
Determining if the post-fan control time (t) for the blower fan has expired if not greater;
When the post-fan control time (t) of the blowing fan is terminated, detecting an exhaust pipe exhaust temperature (T21 DEG C) at that time point;
Then, it is determined whether a second time (B seconds) elapses;
Detecting an exhaust temperature (T22 DEG C) again when a second time (B seconds) elapses;
Determining whether a value obtained by subtracting the exhaust temperature (T22 占 폚) after the second time (B seconds) has elapsed from the exhaust temperature (T21 占 폚) immediately after the post fan termination is greater than a second reference temperature (T2 占 폚);
(T21 DEG C - T22 DEG C)> second reference temperature (T2 DEG C), entering into a normal combustion standby state after extinguishing the exhaust gas.
The method of claim 2,
As a result of judging whether or not the value obtained by subtracting the exhaust temperature (T22 DEG C) after the lapse of the second time (B seconds) from the exhaust temperature (T21 DEG C) immediately after the end of the post fan is larger than the second predetermined reference temperature (T2 DEG C)
And displaying an error indicating that the exhaust temperature detecting sensor is disconnected, on the display unit provided in the temperature adjusting device, if the temperature of the exhaust gas is not large.
The method of claim 3,
Further comprising the step of stopping each component of the combustion device safely after the error is displayed on the display unit.
The method according to claim 1,
The first reference temperature (T1 ° C)
And the temperature of the exhaust gas is set between 0 and 10 占 폚.
The method of claim 2,
The second reference temperature (T2 ° C)
And the temperature of the exhaust gas is set between 0 and 10 占 폚.
The method according to any one of claims 5 and 6,
Wherein the first reference temperature (T1 ° C) and the second reference temperature (T2) are set at different temperatures, respectively.
The method according to claim 1,
Wherein the post fan control time for the blowing fan after the burner is extinguished is set to 2 to 3 minutes and the blowing fan is controlled to have a rotational speed of 40 to 50% Detection of exhaust temperature of a combustion device.

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