EP1060348A1 - Dispositif pour la regulation active du rapport air/gaz d'un bruleur comprenant un dispositif de mesure de pression differentielle - Google Patents
Dispositif pour la regulation active du rapport air/gaz d'un bruleur comprenant un dispositif de mesure de pression differentielleInfo
- Publication number
- EP1060348A1 EP1060348A1 EP99937976A EP99937976A EP1060348A1 EP 1060348 A1 EP1060348 A1 EP 1060348A1 EP 99937976 A EP99937976 A EP 99937976A EP 99937976 A EP99937976 A EP 99937976A EP 1060348 A1 EP1060348 A1 EP 1060348A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- gas
- pressure
- sensor
- differential pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
- F23N5/188—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using mechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/06—Ventilators at the air intake
- F23N2233/08—Ventilators at the air intake with variable speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F23N2235/16—Fuel valves variable flow or proportional valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2900/00—Special features of, or arrangements for controlling combustion
- F23N2900/05181—Controlling air to fuel ratio by using a single differential pressure detector
Definitions
- Device for active regulation of the air / gas ratio of a burner comprising a differential pressure measurement device
- the present invention relates to a device for active regulation of the air / gas ratio of a mixture of air and combustible gas admitted to a burner, using at least one differential pressure measurement device
- a differential pressure device comprising a differential pressure sensor is usually used, the two inputs of which are respectively connected to two pressure taps
- these two pressure taps are respectively located on either side of a diaphragm placed in the conduit where the fluid circulates
- the two pressure taps are connected respectively to the conduits where the two fluids flow respectively
- the accuracy of the flow rate or pressure difference measurement depends on the accuracy of the differential pressure sensor, in particular for low flow rates or low differential pressures
- the pressure difference ⁇ P and flow Q are linked by
- K is a coefficient whose value depends in particular on the density of the fluid whose flow is to be measured, and the section of the orifice of the diaphragm placed in the conduit where said fluid circulates
- differential pressure sensor used for the measurement of the flow must therefore be very precise and very stable in order to be able to provide an output with a reliable value for the low flow rates.
- differential pressure sensors exist but they are extremely expensive and, consequently, unusable in devices whose total manufacturing cost must remain relatively moderate, such as for example in a device for regulating the air / gas ratio of a burner, for example the burner of a boiler intended for the production of domestic hot water and / or hot water for a heating circuit
- the differential pressure measurement device shown in FIG. 1 essentially comprises a differential pressure sensor 1, the inlet ports 2 and 3 of which are connected respectively to a pressure tap 4, where a pressure P1 prevails, and to the common way 5 of a three-way valve 6
- the other two ways 7 and 8 of valve 6 are respectively connected to a pressure tap 9, where a pressure P2 prevails (P2 ⁇ P1), and to the orifice input 2 of sensor 1 via a conduit 11
- sensor 1 supplies a signal at its output 12 which is representative of the pressure difference P1 - P2 This signal is applied to the input of a means of 3
- a unit control 23 sends for a short time to the valve 6 and to the switching means 13, respectively by lines 24 and 25, control signals which pass momentarily the valve 6 in a state such that it interrupts the communication between the inlet port 3 of the sensor 1 and the pressure tap 9 and establishes a communication between the inlet ports 2 and 3 of the sensor 1, and the switching means 13 in a state such that it connects the output 12 of the sensor 1 to the input of the memory 17
- the same pressure P1 is applied to the two inlet ports 2 and 3 of the sensor 1 and l possible measurement error from sensor 1 is stored in memory 17 With the aid of the subtraction means 21 this error is subtracted from the value of the output signal of the sensor 1
- the known differential pressure measurement device which has been described with reference to FIG. 1 gives all satisfaction from the point of view of calibrating the sensor zero.
- it has the disadvantage of using a three-way valve, which is a relatively expensive item
- the differential pressure measuring devices of the type described above can be used in devices making it possible to regulate the air / gas ratio of the burner of a boiler.
- Devices for regulating the air / gas ratio are for example described in the Japanese publication. already cited above and in the report published by the Technical Association of the Gas Industry in France, during the 113th Gas Congress in Paris, September 10-13, 1996, "Recueil des Communications", Tome 2, page 245 - 251, article "Active regulation of the air / gas ratio of a burner” by C PECHOUX et al
- the device for regulating the air / gas ratio described in the abovementioned Japanese publication uses a single differential pressure sensor which measures the difference between the pressure of air Pa upstream of the air diaphragm in the pressurized air supply line and the gas pressure Pg upstream of the gas diaphragm in the gas supply line A three-way valve and a measurement circuit similar to those described above with reference to FIG.
- the device for regulating the air / gas ratio described in the aforementioned report uses two differential pressure sensors, one to measure the difference between the air pressure Pa and the gas pressure Pg, as in the abovementioned Japanese publication, the other to measure the air flow in the pressurized air supply line Although in the latter device 5
- the present invention aims to provide a device for active regulation of the air / gas ratio of a burner using at least one differential pressure measurement device according to the invention
- the differential pressure measurement device implemented in the regulation device according to the invention, uses a differential pressure sensor, capable of exhibiting thermal drifts and in the long term, and includes a measurement circuit making it possible to carry out a automatic calibration of the sensor zero, said differential pressure measuring device being less expensive than the known measuring device described above
- This differential pressure measuring device comprises a differential pressure sensor having first and second inlet ports connected respectively to first and second pressure taps, and an output which, in service, delivers an output signal representative of a difference 6
- valve which is connected to the first and second inlet ports of the sensor and which, in a first state, isolates the two inlet ports from one another and, in a second state, puts them in communication with each other of the storage means connected to the output of the sensor to store at least two values of the output signal of the sensor II also comprises a control unit connected to the valve and the storage means for switching the valve and controlling the storage of a first value of the sensor output signal in the storage means when the valve is in its first state, and the storage of a second value of the storage signal output of the sensor in the storage means when the valve is in its second state II finally comprises measurement means for performing an automatic calibration of the sensor zero
- the measurement means are constituted by memory circuits forming the storage means and by a subtraction means for calculating the difference between the first and second values of the output signal from the sensor.
- the measurement circuit delivers output a measurement signal representing the exact value of the difference in pressures respectively applied to the first and second sensor inlet ports
- the pressure measuring device also has a calibrated throttle orifice, which is inserted into one of the first and second pressure taps.
- the valve is a two-way valve, a first way of which is connected to that of the first and second pressure taps into which the calibrated throttle orifice is inserted, between this calibrated orifice and the corresponding inlet port of the sensor A second channel is connected to the other of the first and second pressure taps
- the calibrated orifice has a significantly smaller flow section than that of said two-way valve
- the main object of the invention is therefore a device for active regulation of the air / gas ratio of a burner, comprising an air / gas mixer located upstream of the burner, an air line, containing a calibrated diaphragm of air and connected to a first inlet of said air / gas mixer, a gas supply pipe, containing a calibrated gas diaphragm and connected to a second inlet of said air / gas mixer, arranged upstream of said calibrated air and gas diaphragms, means for adjusting the air and gas flow rates sent to said air / gas mixer, and at least one differential pressure measurement device connected so as to deliver a measurement signal representative of at least one of the parameters that are the flow of air in the air line, the difference of air and gas pressures in the air and gas lines, and the flow of gas in the gas line so that the amount of gas sent air / gas mixer either such that the air / gas ratio has a predefined value, characterized in that each of the differential pressure measuring devices comprises a differential pressure sensor having first and second
- storage means connected to the output of each sensor for storing at least two values of the output signal of each sensor, a control unit connected to said two-way valve and to storage means for switching said two-way valve and controlling storing a first value of the sensor output signal in said storage means when the two-way valve is in its first state, and storing a second value of the sensor output signal in said storage means when the two-way valve is in its second state, and - means for calculating the difference between said first and second values of the sensor output signal, said storage means and said difference calculation means forming a measurement circuit which outputs a measurement signal representing the exact value of the difference in pressures respectively applied to the first and second inlet ports of each sensor
- a first embodiment of the device for regulating the air / gas ratio for measuring the air flow in the air line and for measuring the difference of the air and gas pressures respectively in the air line and in the gas line
- two differential pressure measuring devices each comprising a differential pressure sensor, a calibrated throttle orifice, a two-way valve and a measuring circuit
- two two-way valves are used which are simpler and less expensive than two three-way valves which should be used with previously known differential pressure measuring devices.
- the device for regulating the air / gas ratio according to the invention for measuring the air flow and for measuring the difference in air and gas pressures it is possible to use two measuring devices pressure differential according to the invention which have in common a single calibrated throttle orifice and a single two-way valve for performing the zero calibration of each of the two differential pressure sensors 9
- the device for regulating the air / gas ratio for measuring the air flow and for measuring the difference of the air and gas pressures or the gas flow
- a single differential pressure measurement device according to the invention, by means of the use of an additional two-way valve and a switching means for sending the output signal of the measurement circuit of the pressure measurement device selectively differential to the air flow regulating unit and the gas supply regulating unit, the latter regulating unit being able to be designed either in the form of an air / gas pressure regulating unit if
- the differential pressure sensor of the differential pressure measuring device is provided for measuring the difference in air and gas pressures, either in the form of a gas flow regulation unit if said ca Differential pressure sensor is provided for measuring the gas flow rate.
- FIG. 1 schematically represents a previously known differential pressure measuring device
- FIG. 2 schematically represents the differential pressure measuring device work in the device for regulating the air / gas ratio according to the invention
- - Figure 3 schematically shows a first embodiment of a device for regulating the air / gas ratio of a burner according to the invention, using two devices of differential pressure measurement according to figure 2
- figure 4 represents schematically a second embodiment of the device for regulating the air / gas ratio of a burner, with two differential pressure measurement devices using in common a calibrated throttle orifice and a two-way valve, 10
- FIG. 5 schematically represents a variant of the regulation device of FIG. 4
- FIG. 6 diagrammatically represents a third embodiment, or preferred embodiment, of the device for regulating the air / gas ratio of a burner according to the invention , using a single differential pressure measurement device according to the invention for measuring the air flow and the difference in air and gas pressures
- FIG. 7 schematically represents an exemplary embodiment of a blocking sampler usable in the regulation device of FIG. 6,
- FIG. 8 diagrammatically represents a fourth embodiment of a device for regulating the air / gas ratio of a burner according to the invention, also using a single device for measuring differential pressure according to the invention for measuring air flow and gas flow
- the differential pressure measuring device according to the invention which is shown in FIG. 2 is largely similar to the known measuring device which has already been described above with reference to FIG. 1 Consequently, the elements of the measuring device pressure differential according to the invention which are identical to those of the known device of FIG. 1 are designated by the same reference numbers and will not be described again in detail
- the differential pressure measurement device used in the device for regulating the air / gas ratio according to the invention differs from the device known essentially by the fact that, instead of the three-way valve 6, a calibrated orifice 27 is provided and a two-way valve 28 The calibrated orifice 27 is located in one of the two pressure taps 4 and 9, for example in the pressure tap 9 as shown in FIG.
- valve 28 is inserted in the conduit 11 so that one of the channels of the valve 28 is connected to the pressure tap 4 connected to the inlet port 2 of the sensor 1, and that the other channel of the valve 28 is connected to the pressure tap 9 connected to the inlet port 3 of the 11
- the control unit 23 sends on the line 24 a control signal which briefly opens the valve 28, and simultaneously the control unit 23 transmits on line 25 a control signal which switches the switching means 13 in such a way that the latter connects for a short time the output of the sensor 1 to the input of the memory 17 Since , when the valve 28 is open, it has a much larger passage section than that of the calibrated orifice 27, it is capable of delivering more consideration than the calibrated orifice 27 Consequently, the pressure drop P1 - P3 of the valve 28 is negligible compared to the pressure drop P2 - P3 of the calibrated orifice 27 So, when the valve 28 is opened, the pressure P3 is practically equal to the pressure P1 Consequently, during the brief instant when the valve 28 is open, the two inlet ports items 2 and 3 of sensor 1 are short-circuited from the pneumatic or hydraulic point of view and sensor 1 measures a zero pressure difference At this time, if the output signal from sensor 1,
- the measurement circuits 26 are capable of taking various hardware and / or software configurations.
- the resources offered by a microprocessor could be used, either dedicated to this task, or already present in the regulation device
- a microprocessor is generally associated with internal and / or external storage means (registers, random access memory, etc.)
- the subtraction operation can be carried out by the arithmetic unit and logic with which the microprocessor is provided All of the operations can be under the control of a specific program
- the control unit 23 can be confused with this same microprocessor It is only necessary to provide specific electronic circuits for the interface input and output, receiving sensor output signals and transmitting signals to the control valves 28 These circuits (not shown) provide in particular analog-digital conversions or vice versa, and the necessary level adaptations
- FIG. 3 shows an example of a device making it possible to regulate the air / gas ratio of a burner 29, according to a first embodiment of the invention, for example the burner of a boiler 30
- the number of reference 31 designates a fan, which is actuated by an electric motor 32 at variable speed and which is connected by an air line 33 containing a calibrated diaphragm of air 34 to a first inlet 35 of an air / gas mixer 36 located upstream of the burner 29
- the air / gas mixer 36 is HERE represented as a separate element from the burner 29, it can also be integrated into the latter as is well known
- a pipe gas supply 38 which contains a calibrated gas diaphragm 39 and, upstream of this diaphragm, a proportional valve 41 whose inlet side is connected to a source of pressurized combustible gas (not shown), for example to a pressurized fuel gas distribution network
- the proportional valve 41 makes it possible to adjust the pressure Pg of the gas in
- Pa denotes the air pressure in the air line 33 upstream of the air diaphragm 34 and Pm denotes the pressure of the air / gas mixture in the mixer 36
- Pm denotes the pressure of the air / gas mixture in the mixer 36
- the reference numbers 42a and 42b designate two differential pressure measuring devices which are intended to measure respectively the pressure difference Pa - Pm and the pressure difference Pa - Pg
- Each of the two differential pressure measuring devices 42a and 42b is produced and operates in the same way as the differential pressure measuring device described with reference to FIG. 2 This is why their elements are designated by the same reference numbers as those of the corresponding elements of the differential pressure measuring device in FIG. 2, these reference numbers being assigned the letter "a" for the elements of the differential pressure measuring device 42a and the letter "b” for the elements of the differential pressure measuring device 42b
- the two pressure measuring devices differential 42a and 42b will therefore not be described again in detail.
- the inlet ports 2a and 2b of the sensors 1a and 1b are connected to a single pressure tap 4 connected to the air line 33 upstream of the air diaphragm 34
- the inlet ports 2a and 2b of the sensors 1a and 1b could be connected to separate pressure taps connected to the air line 33 upstream of the air diaphragm 34
- the other inlet port 3a of the sensor 1a is connected to the pressure tap 9a which contains the calibrated throttle orifice 27a and which is connected to the air line 33 downstream of the air diaphragm 34
- inlet 3b of the sensor 1b is connected to the pressure tap 9b which contains the calibrated throat orifice 27b and which is connected to the gas pipe 38 upstream from the gas diaphragm 39
- one and the same control unit 23 can be provided for controlling, by lines 24a and 25a, the valve 28a and the measurement circuit 26a of the differential pressure measuring device 42a and, by lines 24b and 25b, the valve 28b and the measurement circuit 26b of the differential pressure measurement device 42b
- the zero calibration of the sensors 1 a and 1 b of the pressure measurement devices differential 42a and 42b is carried out at regular intervals, for example every minute, exactly in the same way as that described with reference to FIG. 2
- the zero calibration of the two sensors 1 a and 1 b is carried out simultaneously, but it could be carried out at different times if desired.
- the measurement circuit 26a of the differential pressure measurement device 42a therefore delivers on its output 22a a corrected measurement signal which represents ente the exact value of the pressure difference Pa - Pm
- the measurement circuit 26b of the differential pressure measurement device 42b delivers on its output 22b a corrected measurement signal which represents the exact value of the pressure difference Pa - Pg
- the air flow Qa in the air line 33 is related to the difference in pressures prevailing on either side of the air diaphragm 34, that is to say the pressure difference Pa - Pm, by the following formula
- the measurement signal present at the output 22a of the circuit measurement 26a also gives an indication of the value of the air flow rate Qa in line 33
- the device for regulating the air / gas ratio shown in FIG. 3 further comprises, in a manner known per se, a unit for regulating the 15
- the temperature regulation unit 43 which receives a temperature setpoint signal at its input 44
- the temperature regulation unit 43 sends a line 45 request for ignition of the burner to the control unit 23 which, via a line 46, then controls an ignition device 47 in order to cause the ignition of the burner 29
- the temperature regulation unit 43 delivers an air flow setpoint signal, the value of which depends on the temperature setpoint signal value applied to the input 44
- the airflow setpoint signal delivered by the temperature control unit 43 is sent to an input of a conventional air flow regulation unit 49 which also receives on another input the corrected measurement signal which is present on the output 22a of the measurement circuit 26a and which is indicative of the value flow of air Qa in the pipe 33
- the latter produces on its output 51 a control signal which is sent to the motor 32 of the fan 31 in order to adjust the speed of rotation
- a control signal which is sent to the motor 32 of the fan 31 in order to adjust the speed of rotation
- the device for regulating the air / gas ratio of FIG. 3 further comprises a conventional air / gas pressure regulating unit 52 receiving on an input the corrected measurement signal which is present on the output 22b of the measurement circuit 26b which represents the pressure difference Pa - Pg
- the air / gas pressure regulation unit 52 produces, in known manner, at its output 53 a control signal which is sent to the proportional valve 41 in order to regulate the gas pressure Pg in the gas line 38
- the gas pressure Pg is regulated by the air / gas pressure regulating unit 52 so that the pressure difference Pa - Pg has a predefined value, for example a zero value
- the air / gas pressure control unit 52 acts on the proportional valve 41 until the gas pressure Pg becomes equal to the air pressure Pa , so up 16
- the air / gas pressure regulating unit 52 can be designed so that the gas pressure Pg is controlled by the air pressure Pa, not so that these two pressures remain permanently equal to the one to the other, but for the pressure Pg to be linked to the pressure Pa by a predetermined relationship which can vary as a function of the instantaneous power requested from the burner For example, a given burner may need an air / gas varying in a predetermined way between the 17
- the air / gas pressure regulation unit can be for example designed to regulate the gas pressure Pg so as to obtain the desired air / gas ratio as a function of the instantaneous power requested from the burner and / or for a few seconds when the burner is ignited
- FIG. 4 shows a second embodiment of the device for regulating the air / gas ratio of a burner, in which there is provided a single calibrated throttle orifice and a single two-way valve for calibrating the two sensors of differential pressure
- the elements of the device for regulating the air / gas ratio which are identical or which play the same role as those of the device for regulating the air / gas ratio of FIG. 3 are designated by the same numbers of reference and will not be described again in detail.
- the device for regulating the air / gas ratio of FIG. 4 differs from that of FIG.
- valve 3 essentially in that it comprises a single calibrated throttle orifice 27, which is located in the common pressure tap 4, and a single two-way valve 28
- One of the two ways of the valve 28 is connected directly to the inlet ports 2a and 2b of the sensors la and 1b and, through the o calibrated throttle hole 27, at the pressure tap 4
- the other way of the valve 28 is connected to a pressure tap 54 connected to the air line 33 downstream of the air diaphragm 34, where there is a pressure equal to the pressure Pm
- the valve 28 could just as easily be connected either to the pressure tap 9a, or to the pressure tap 54 'connected to the mixer 36, or again at the pressure tap 54 "connected to the gas line 38 downstream from the diaphragm 39, since in all these places there prevails, in service, a pressure equal to the pressure Pm 18
- the control unit 23 when the valve 28 is opened, the pressure Pm is applied, through the pressure tap 54 and the valve 28, to the orifices 2a and 2b of the pressure sensors 1 a and 1 b A at this time, the pressure Pm is also applied through the pressure tap 9a to the inlet orifice 3a of the sensor la If, at this time, the proportional valve 41 is at least partially open, the pressure Pg is applied through the pressure tap 9b at the inlet 3b of the sensor 1b On the other hand, if, at the same time, the proportional valve 41 is closed, there is no gas flow through the gas diaphragm 39 and, consequently, the pressure Pg is equal to the pressure Pm and this pressure is applied through the pressure tap 9b to the inlet orifice 3b of the sensor 1b It can therefore be seen that, in order to carry out a zero calibration of the two sensors 1 a and 1 b, the control unit 23 must cause the valve 28 to open for a short time ant by an appropriate command on line 24 and, simultaneously,
- Figure 4 device works in the same way as that of Figure 3 to regulate the air / gas ratio of the burner 29
- FIG. 5 shows an alternative embodiment of the device for regulating the air / gas ratio of FIG. 4
- the elements of the device which are identical or which play the same role as those of the device of FIG. 4 are designated by the same reference numbers and will not be described again in detail
- the device of FIG. 5 differs essentially from that of FIG.
- FIG. 6 shows a preferred embodiment of the device for regulating the air / gas ratio of the burner of a boiler.
- a single differential pressure measurement device 42 for measuring, from a on the one hand, the pressure difference Pa-Pm and, on the other hand, the pressure difference Pa-Pg
- the elements which are identical or which play the same role as those of the preceding embodiments are designated by the same reference numbers and will not be described again in detail
- the inlet port 2 of the sensor 1 is connected to the pressure tap 4 connected to the air line 33 upstream of the diaphragm.
- the inlet 3 of the sensor 1 is connected to the pressure tap 9 connected to the gas line 38 upstream of the gas diaphragm 39 and the calibrated throttle hole 27 is located in the pressure tap 9 as in the mode of embodiment of FIG. 3
- One of the channels of the two-way valve 28 is connected to the pressure tap 4 and to the inlet port 2 of the sensor 1,
- the other channel of the valve 28 is connected to the inlet 3 of sensor 1 through line 1 1 and to one of the two channels of another two-way valve 56, the other channel of which is connected to a pressure tap 57 where an equal pressure prevails at the pressure Pm
- the pressure tap 57 is connected to the mixer 36, but it could be connected to the air line 33 downstream of the air diaphragm 34 or to the gas line 38 downstream of the gas diaphragm 39
- the valve 56 is controlled by the control unit 23 through a line 58
- the output 22 of the measurement circuit 26 is connected to the input of a switching means 59, a first output of which is connected by a line 61 to the measurement unit. 21
- the control unit 23 is connected to a control input of the switching means 59 by a line 63 According to the state of the control signal present on line 63, the measurement signal present on the output 22 of the measurement circuit 26 is sent by the switching means 59 either to the air flow regulation unit 49 by line 61 or to the air / gas pressure regulation unit 52 by line 62
- the output 51 of the air flow regulation unit 49 is connected to the motor 32 via a blocking sampler 64, which is controlled by the control unit 23 through a line 65 De
- the output 53 of the air / gas pressure regulation unit 52 is connected to the proportional valve 41 by means of a blocking sampler 66, which is controlled by the control unit 23 through a line 67
- each of the two samplers 64 and 66 can be produced as shown in FIG. 7
- Each blocking sampler 64 or 66 has an input 68 connected by an electronic switch 69 to one of the armatures of a capacitor C, the other armature of which is connected to ground, and to the input of an amplifier 71 with high input impedance, the output 72 of which forms the output of the blocking sampler and is connected to the motor 32 or to the proportional valve 41
- the electronic switch 69 is controlled by the control unit 23 via line 65 or 67
- the control signal delivered by the air flow control unit 49 or by the control unit of air / gas pressure 52 at input 68 for example a control voltage
- the control signal which the air flow control unit 49 or by the control unit of air / gas pressure 52 at input 68, for example a control voltage
- the control unit 23 sends via the line 65 a command to the blocking sampler 64 to close the switch 69 thereof. If the value of the measured air flow rate does not comply with the set value delivered at this time by the temperature control unit 43 to the air flow control unit 49, the latter transmits on its output 51 a new control signal, for example a control voltage having a new value, which is stored in the capacitor C of the blocking sampler 64 and transmitted to the motor 32 to modify its speed, so that the flow of air produced by fan 31 becomes equal to the air flow setpoint.
- the control unit can command the opening of the switch 69 of the blocking sampler 64 23
- the pressure Pa is applied through the pressure tap 4 to the inlet port 2 of the sensor 1 and the pressure Pg is applied through the pressure tap 9 and the port calibrated throttle 27 at the input port 3 of the sensor 1
- the sensor 1 measures the pressure difference Pa-Pg and the measurement circuit 26 delivers on its output 22 a corrected measurement signal which represents this pressure difference
- the control unit 23 controls the closing of the switch 69 of the blocking sampler 66 If at this time the pressure Pg does not have the desired value, for example if it is not equal to the pressure Pa, the pressure regulating unit on air / gas 52 emits on its output 53 a new control signal, for example a control voltage having a new value, which is stored in the capacitor C of the blocking sampler 66 and transmitted to the proportional valve 41 to adjust the pressure P
- control unit 23 closes the valve 28 and opens the valve 56 so that the sensor 1 measures the air flow in the air duct 33.
- the control unit 23 acts on the means of switching 59 so that it sends the measurement signal present on the output of the measuring circuit 26 to the air flow regulation unit 49, and it closes the switch 69 of the blocking sampler 64, so that the regulation unit 49 regulates the air flow 24
- control unit 23 blocks the control signal sent to the motor 32 by opening the switch 69 of the blocking sampler 64, and it closes the valve 56 (at this time the valve 28 is already closed) so that the sensor 1 measures the pressure difference Pa-Pg.
- control unit 23 acts on the switching means 59 so that it sends the measurement signal present on the output 22 of the measurement circuit 26 to the air / gas pressure regulation unit 52, and it closes the switch 69 of the blocking sampler 66, so that the control signal present at the output 53 of the air / gas pressure regulating unit 52 acts on the proportional valve 41 so as to regulate the gas pressure Pg, for example in such a way that it becomes equal to the air pressure Pa.
- the control unit 23 opens the switch 69 of the blocking sampler 66, closes the valve 28, opens the valve 56, acts on the switching means 59 so that it sends the output signal from the measurement circuit 26 to the air flow regulation unit 49. and closes, for example for one second, the switch 69 of the blocking sampler 64.
- the unit regulation 49 regulates, if necessary, the speed of the motor 32 so that the air flow rate in the air line 33 is equal to the air flow setpoint value produced by the temperature regulation unit 43.
- the control unit 23 returns the device for regulating the air / gas ratio to the state corresponding to the air / gas pressure regulation, by opening the switch 69 of the blocking sampler 64, by closing the two valves. 28 and 56, by acting on the switching means 59 so that it sends the output signal from the measurement circuit 26 to the air / gas pressure regulation unit 52 and by closing the switch 69 of the blocking sampler 66.
- the control unit 23 controls a calibration of the pressure zero of the sensor 1, by opening if necessary the switch 69 of each of the two 25
- FIG. 8 shows yet another embodiment of the device for regulating the air / gas ratio of a burner, variant of the preferred embodiment According to this variant, provision is also made a single differential pressure measurement device
- FIG. 8 the elements of the device which are identical or which play the same role as those of the device of FIG. 6 are designated by the same reference numbers and will not be described again in detail.
- the device of FIG. 8 differs from that of FIG. 6 in that the inlet orifice 2 of the single differential pressure sensor 1 is connected, on the one hand, to the pressure tap 4 through the calibrated throttle orifice 27 and , on the other hand, to the pressure tap 57 on the gas pipe via the valve 56, while the inlet port 3 of said sensor 1 is directly connected to the pressure tap 9 on the mixer 36 where a pressure equal to the pressure Pm prevails
- the output of the switching means 59 which is connected by line 61 to the air flow regulation unit 49 and also connected by a line 73 to another sampler blocker 74 which can be made in the same way re that the Mockers 64 and 66 samplers (see Figure 7) and which is controlled by the control unit 23 through line 75
- the switching means 59 sends at this moment the measurement signal present on the output 22 of the measurement circuit 26 to the air flow regulation unit 49 the latter can adjust, if necessary, the speed of the motor 32 so that the air flow in the air line 33 is equal to the air flow setpoint supplied by the temperature regulation unit 43 to the air flow regulation unit 49, in a manner similar to that described above with respect to the embodiment of FIG. 6
- the measurement signal which is present on the output 22 of the measurement circuit 26 and which is indicative of the air flow is also sent by the switching means 59 and by line 73 to the blocking sampler 74 to be stored there and transmitted by line 76 to another input of the regulation unit 52
- the inlet ports 2 and 3 of the sensor 1 are respectively subjected to the pressure Pg and to the pressure Pm.
- the sensor 1 therefore measures the difference pressure Pg - Pm which, for a given gas diaphragm 39, gives an indication of the gas flow Qg in the gas line 38, according to the following formula
- the measurement signal present on the output 22 of the measurement circuit 26 gives an indication of the gas flow in the gas line 38
- the control unit 23 acts on the switching means 59 so that it sends this measurement signal via the line 62 to the regulation unit 52, the latter receives on its inputs respectively by lines 76 and 62, a signal whose value is indicative of the air flow in line 33 and a signal whose value is indicative of gas flow in line 38
- the unit control valve 52 is designed as a gas flow control unit, that is to say that it acts on the proportional valve 41 so as to adjust the 27
- the sequence of operations controlled by the unit 23 can be as follows
- control unit 23 performs the calibration of the pressure zero of the sensor 1 by closing the valve 56 if it was open, by opening the valve 28 for a short time, by sending a signal via the line 25 control circuit 26 so that it stores in its memory (17) any measurement error present at this time on output 12 of sensor 1
- control unit 23 closes the valve 28, acts on the switching means 59 so that it connects the output 22 of the measurement circuit 26 to the air flow regulation unit 49 and to the sampler blocker 74, close the switch 69 of this blocker sampler 74 and also close the switch 69 of the blocker sampler 64, so that the regulation unit 49 regulates the air flow in the air line 33 for the make equal to the set value of air flow delivered by the temperature control unit 43
- the control unit 23 opens the switch 69 of the blocking sampler 64, opens the switch of the blocking sampler 74 in order to keep in that -this the differential pressure value Pa - Pm representing the air flow, opens the valve 56 (at this time the valve 28 is already closed), acts on the switching means 59 so that it connects the output 22 of the circuit 26 to the gas flow regulation unit 52 via line 62 and closes the switch 69 of the blocking sampler 66 so that the regulation unit 52 regulates the proportional valve 41 so as to obtain a pressure of gas Pg such that the pressure difference Pg - Pm measured by the sensor 1 is equal to the value of the differential pressure which has been stored in the blocking sampler 74
- This device operates insofar as the sections Sa and Sg of the calibrated orifices d u air diaphragm 34 and diaphragm 28
- the control unit 23 opens the switch 69 of the blocking sampler 66, closes the valves 28 and 56 if they were open, acts on the switching means 59 to that it directs the output signal from the measurement circuit 26 to the air flow regulation unit 49, closes the switch 69 of the blocking sampler 64 in order to adjust, if necessary, the air flow in the air line 33, closes the switch 69 of the blocking sampler 74 in order to update, if necessary, the value of the differential pressure representing the air flow memorized in the blocking sampler 74, opens the switch 69 from the blocking sampler 64, opens the valve 56, acts on the switching circuit 59 so that it directs the output signal from the measuring circuit 26 to the regulating unit 52 via line 62 and closes the switch 69 of the blocker sampler 66 in order to adjust er if necessary the gas flow rate in the gas line 38, then open the switch 69 of the blocking sampler 66 and close the valve 56
- the control unit samples the pressure zero of the sensor 1 by carrying out the operations already described above.
- the various circuits which have been described above for example the measurement circuit (s) 26, the control unit 23, the switching means 59, the regulation units 43, 49 and 52, the blocking samplers 64, 66 and 74, can be produced either by discrete electronic circuits like those which have been described above, or by a suitably programmed microprocessor Similarly, in FIGS. 3, 4, 5, 6 and 8, the fan 31 is shown upstream of the orifice 34 for measuring the air flow rate but it is very hipn new dam ⁇ tue "r 29
- the measurement circuits are likely to take different configurations. It must also be clear that, although particularly suitable for regulating a boiler burner intended for the production of domestic hot water and / or d hot water for a heating circuit, the invention cannot be confined to this only type of application It applies more generally whenever it is desired to carry out active regulation of the air / gas ratio of a mixture of air and combustible gas admitted to a burner, using at least one differential pressure measuring device
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9802794A FR2775782B1 (fr) | 1998-03-06 | 1998-03-06 | Dispositif de mesure de pression differentielle et dispositif pour la regulation active du rapport air/gaz d'un bruleur utilisant un tel dispositif de mesure |
FR9802794 | 1998-03-06 | ||
PCT/FR1999/000505 WO1999045325A1 (fr) | 1998-03-06 | 1999-03-05 | Dispositif pour la regulation active du rapport air/gaz d'un bruleur comprenant un dispositif de mesure de pression differentielle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1060348A1 true EP1060348A1 (fr) | 2000-12-20 |
EP1060348B1 EP1060348B1 (fr) | 2004-01-07 |
Family
ID=9523768
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99937976A Expired - Lifetime EP1060348B1 (fr) | 1998-03-06 | 1999-03-05 | Dispositif pour la regulation active du rapport air/gaz d'un bruleur comprenant un dispositif de mesure de pression differentielle |
Country Status (7)
Country | Link |
---|---|
US (1) | US6533574B1 (fr) |
EP (1) | EP1060348B1 (fr) |
JP (1) | JP2002506190A (fr) |
CA (1) | CA2322677A1 (fr) |
DE (1) | DE69914063D1 (fr) |
FR (1) | FR2775782B1 (fr) |
WO (1) | WO1999045325A1 (fr) |
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FR2875289B1 (fr) * | 2004-09-14 | 2006-11-10 | Theobald Sa Sa A | Procede pour la regulation du rapport air/gaz d'un bruleur et bruleur mettant en oeuvre ce procede |
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KR100599170B1 (ko) | 2005-04-29 | 2006-07-12 | 주식회사 경동네트웍 | 풍압센서를 이용한 공연비 제어 보일러 및 그것의 공연비제어방법 |
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DE102007032483A1 (de) * | 2007-07-12 | 2009-01-22 | Karl Dungs Gmbh & Co. Kg | Betriebseinrichtung für einen Oberflächenbrenner hoher Leistung und Betriebsverfahren für diesen |
FR2921461B1 (fr) * | 2007-09-24 | 2010-03-12 | Theobald Sa A | Dispositif de regulation des debits de gaz alimentant un bruleur equipe d'un tel dispositif |
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US8864887B2 (en) | 2010-09-30 | 2014-10-21 | Rodney T. Heath | High efficiency slug containing vapor recovery |
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US10317076B2 (en) | 2014-09-12 | 2019-06-11 | Honeywell International Inc. | System and approach for controlling a combustion chamber |
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US9527786B1 (en) | 2013-03-15 | 2016-12-27 | Rodney T. Heath | Compressor equipped emissions free dehydrator |
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ITPD20130186A1 (it) * | 2013-07-02 | 2015-01-03 | Sit La Precisa S P A Con Socio Uni Co | Metodo di controllo del funzionamento di un bruciatore |
US9932989B1 (en) | 2013-10-24 | 2018-04-03 | Rodney T. Heath | Produced liquids compressor cooler |
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JP6383310B2 (ja) * | 2015-03-18 | 2018-08-29 | アズビル株式会社 | 燃焼制御装置および燃焼システム |
CN106642711B (zh) * | 2015-09-22 | 2022-09-16 | 艾欧史密斯(中国)热水器有限公司 | 双传感燃烧系统 |
US10274195B2 (en) * | 2016-08-31 | 2019-04-30 | Honeywell International Inc. | Air/gas admittance device for a combustion appliance |
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CN110319463B (zh) * | 2019-08-09 | 2024-03-19 | 中山市铧禧电子科技有限公司 | 一种利用空气计算折算热负荷的系统和方法 |
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-
1998
- 1998-03-06 FR FR9802794A patent/FR2775782B1/fr not_active Expired - Lifetime
-
1999
- 1999-03-03 US US09/623,636 patent/US6533574B1/en not_active Expired - Fee Related
- 1999-03-05 WO PCT/FR1999/000505 patent/WO1999045325A1/fr active IP Right Grant
- 1999-03-05 JP JP2000534818A patent/JP2002506190A/ja active Pending
- 1999-03-05 CA CA002322677A patent/CA2322677A1/fr not_active Abandoned
- 1999-03-05 DE DE69914063T patent/DE69914063D1/de not_active Expired - Lifetime
- 1999-03-05 EP EP99937976A patent/EP1060348B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
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See references of WO9945325A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2002506190A (ja) | 2002-02-26 |
WO1999045325A1 (fr) | 1999-09-10 |
DE69914063D1 (de) | 2004-02-12 |
CA2322677A1 (fr) | 1999-09-10 |
EP1060348B1 (fr) | 2004-01-07 |
FR2775782B1 (fr) | 2000-05-05 |
FR2775782A1 (fr) | 1999-09-10 |
US6533574B1 (en) | 2003-03-18 |
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