EP3524884A1 - Retrofit assembly for a fuel gas boiler and method for modifying a fuel gas boiler - Google Patents
Retrofit assembly for a fuel gas boiler and method for modifying a fuel gas boiler Download PDFInfo
- Publication number
- EP3524884A1 EP3524884A1 EP19166651.0A EP19166651A EP3524884A1 EP 3524884 A1 EP3524884 A1 EP 3524884A1 EP 19166651 A EP19166651 A EP 19166651A EP 3524884 A1 EP3524884 A1 EP 3524884A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- fuel gas
- feeding assembly
- boiler
- assembly
- 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
- 239000002737 fuel gas Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims description 52
- 239000007789 gas Substances 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 230000002596 correlated effect Effects 0.000 claims abstract description 13
- 230000001276 controlling effect Effects 0.000 claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 31
- 229910052760 oxygen Inorganic materials 0.000 claims description 31
- 239000001301 oxygen Substances 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- CNQCVBJFEGMYDW-UHFFFAOYSA-N lawrencium atom Chemical compound [Lr] CNQCVBJFEGMYDW-UHFFFAOYSA-N 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
- F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/002—Regulating fuel supply using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
- F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
-
- 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
- F23N2005/185—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of fuel
Definitions
- the present invention relates to a retrofit assembly for a fuel gas boiler and a method for modifying a fuel gas boiler installed in a heating plant.
- the retrofit assembly adjusts the fuel gas flow rate in a fuel gas boiler.
- the existing fuel gas boilers comprise a gas burner, a feeding assembly for feeding fuel gas to the burner, a control unit for controlling the feeding assembly and configured to regulate the combustion process according to the thermal power demand.
- the combustion control unit is configured to operate according to a fixed Wobbe index, predefined in the planning phase. Consequently, the fuel gas boilers fed by methane tolerate small variations of the methane Wobbe index.
- the Wobbe index is the ratio between the maximum calorific value and the square root of the specific gravity of a fuel gas (density related to the one of the air), and is used to compare the calorific value of different fuel mixtures in a fuel gas boiler.
- the European market is developing new regulations aiming to allow the supply of fuel gas from multiple sources. Unfortunately, not all of these sources are able to guarantee the same quality level of fuel gas, namely the same Wobbe index. In contrast, the variability of the Wobbe index can cause problems on the already installed fuel gas boilers. In fact, a significant variation in the Wobbe index determines a worsening of the yield, an increase of the polluting emissions, such as carbon monoxide, as well as problems in the ignition phase and noise.
- the purpose of the present invention is to provide a retrofit assembly for a fuel gas boiler that mitigates at least one of the described drawbacks, in other words that reduces polluting emissions and/or increases the yield and/or reduces the problems in the ignition phase.
- the present invention provides a retrofit assembly for a fuel gas boiler; the fuel gas boiler comprising a fuel gas burner, a feeding assembly for supplying fuel gas to the burner, a control unit for controlling the feeding assembly; the retrofit assembly comprising a processing unit configured to acquire a first control signal of the feeding assembly configured to control the feeding assembly; a second signal correlated to the composition of the exhaust gas or fuel gas; the processing unit being configured to define a third control signal of the feeding assembly configured to control the feeding assembly and based on the second signal and on the first signal; the retrofit assembly being configured to be installed in the boiler and to control the fuel gas flow rate by means of the third signal.
- the retrofit assembly increases the boiler yield and decreases the polluting emissions by acting on the feeding assembly to modify the supply of fuel gas according to the composition of the exhaust gas or the fuel gas, thus obtaining an optimum combustion and reducing fuel consumption and emissions.
- the processing unit is configured to define a theoretical value of the second signal according to the first signal; and to define the third signal according to the difference between the defined theoretical value of the second signal and the actual value of the second signal.
- the retrofit assembly comprises an oxygen sensor configured to detect the exhaust gases of the boiler and to define the second signal correlated to the composition of the exhaust gases.
- the installed boiler is modified by inserting an oxygen sensor downstream of the fuel gas burner; in this way, the performance of the fuel gas boiler is improved by the use of the second signal, which is an index of the combustion quality.
- the processing unit thus modifies the type of control of the fuel gas boiler already installed in a heating plant from an open loop control to a closed loop control. In other words, the boiler will have a feedback control with respect to the combustion process.
- the boiler comprises a stack downstream of the burner and a first fitting element arranged between the burner and the stack; the retrofit assembly comprising a second fitting element comprising the oxygen sensor fixed thereto and configured to be installed between the burner and the stack to replace the first fitting element.
- the oxygen sensor is configured to be inserted in a hole of the stack.
- the oxygen sensor comprises fastening means configured to be fixed to the outlet of the stack to hold firmly into position the oxygen sensor inside the stack.
- the feeding assembly of the boiler comprises a pneumatic valve; the retrofit assembly comprising a flow rate adjustment device configured to be installed downstream of the pneumatic valve to receive the third signal and to adjust a fuel gas flow rate according to the third signal.
- the feeding assembly of the boiler comprises a pneumatic valve; the retrofit assembly comprising a modulator valve configured to be installed instead of the pneumatic valve for receiving the third signal and for adjusting the flow rate according to the third signal.
- the feeding assembly of the boiler comprises a pneumatic valve; the retrofit assembly comprising a controllable pneumatic valve configured to be installed instead of the pneumatic valve for receiving the third signal and for adjusting the flow rate according to the third signal.
- the feeding assembly comprises a fan and the first signal is a value of the number of revolutions of the fan.
- the feeding assembly comprises a modulator valve; and the first signal and the third signal are current values of the modulator valve.
- the boiler comprises a watertight chamber housing the fuel gas burner and the feeding assembly for supplying fuel gas to the burner; the control unit being arranged outside the watertight chamber and being coupled with the feeding assembly through a watertight grommet configured to maintain the tightness of the watertight chamber; and wherein the retrofit assembly is preferably arranged outside the watertight chamber and is coupled with the feeding assembly through the watertight grommet.
- Another object of the present invention is to provide a method for modifying a fuel gas boiler installed in a heating plant which is able to solve the aforesaid problems of currently installed boilers to increase the performance of the installed boiler.
- the present invention therefore provides a method for modifying a fuel gas boiler installed in a heating plant; the boiler comprising a fuel gas burner, a feeding assembly for feeding fuel gas to the burner, a control unit for controlling the flow rate of fuel gas of the feeding assembly; the method comprising the following steps: intercepting a first control signal of the feeding assembly configured to control the feeding assembly; detecting a second signal correlated to the composition of the exhaust gas or fuel gas; supplying a third control signal of the feeding assembly configured to control the feeding assembly and defined according to the second signal and to the first signal; and controlling the feeding assembly by means of the third signal.
- the present invention increases the performance of the installed boiler with respect to a combustion optimization without having to replace the boiler, thereby reducing intervention times and costs. Consequently, the thus modified boiler will have a higher yield and will release lower polluting emissions.
- the method comprises the step of defining a theoretical value of the second signal according to the first signal; and defining the third signal according to the difference between the defined theoretical value of the second signal and the actual value of the second signal.
- the method comprises the step of installing an oxygen sensor configured to define the signal correlated to the composition of the exhaust gas.
- the boiler comprises a stack downstream of the burner and a first fitting element between the burner and the stack; the method comprising the step of removing the first preinstalled fitting element and of installing a second fitting element comprising the oxygen sensor.
- the boiler comprises a stack downstream of the burner; the method comprising the step of drilling the stack and inserting the oxygen sensor in the hole.
- the boiler comprises a stack downstream of the burner; the method comprising the step of inserting the oxygen sensor inside the stack and rigidly coupling it with the outlet of the stack.
- the feeding assembly comprises a modulator valve
- the first signal is a modulation signal of the modulator valve of the feeding assembly; the method comprising the step of sending the third signal to the modulator valve.
- the boiler feeding assembly comprises a pneumatic valve; the method comprising the step of installing a flow rate adjustment device downstream of the pneumatic valve; and of providing the third signal to the flow rate adjustment device.
- the boiler feeding assembly comprises a pneumatic valve; the method comprising the step of replacing the pneumatic valve with a stepper valve and of supplying the third modified signal to the stepper valve.
- the boiler feeding assembly comprises a pneumatic valve; the method comprising the step of replacing the pneumatic valve with a modulator valve and of supplying the third signal to the modulator valve.
- the boiler feeding assembly comprises a pneumatic valve; the method comprising the step of replacing the pneumatic valve with a controllable pneumatic valve and of supplying the third signal to the controllable pneumatic valve.
- the feeding assembly comprises a fan
- the first signal is a signal correlated to the number of revolutions of the fan.
- the boiler comprises a watertight chamber housing the gas burner and the feeding assembly for supplying fuel gas to the burner; the control unit being arranged outside the watertight chamber and being coupled with the feeding assembly through a watertight grommet configured so as to maintain the tightness of the watertight chamber; the method comprising the step of opening the watertight chamber to intercept the first signal and of closing the watertight chamber and preferably using the grommet to transmit the third signal inside the watertight chamber.
- 1 indicates as a whole a fuel gas boiler installed in a heating plant.
- the boiler 1 comprises a fuel gas burner 2, a feeding assembly 3 for supplying the fuel gas to the burner 2, and a control unit 4 for controlling the fuel gas flow rate of the feeding assembly 3, a stack 5 to evacuate the exhaust gas of the burner 2 to the outside and a heat exchanger 6 for heating a fluid by means of the burner 2.
- the boiler 1 is of the atmospheric combustion type, and the feeding assembly 3 comprises a modulator valve 7 which is configured to be controlled according to the values of the control signal S1, the control signal S1 preferably being a current or voltage signal of the fuel gas flow rate.
- the number 100 indicates the retrofit assembly for the fuel gas boiler 1, which is installed in the boiler 1, in turn installed in a heating plant, to increase its performance.
- the retrofit assembly 100 comprises a processing unit 101 configured to acquire the signal S1 of the control unit 4; and an oxygen sensor 102 configured to be installed downstream of the burner 2 and to provide a signal S2 related to the composition of the exhaust gas.
- the method for modifying the installed boiler 1 comprises the step of installing the processing unit 101 inside the boiler 1, and in particular of intercepting the control signal S1 of the feeding assembly 3; and of controlling the modulator valve 7 through a signal S3.
- the method provides the step of disconnecting a cable 9 coupling the control unit 4 with the modulator valve 7 (connection of the original configuration of the installed boiler 1) to supply the signal S1 to the modulator valve 7 of the feeding assembly 3; of coupling said cable 9 with the processing unit 101 of the retrofit assembly 100; and of coupling an additional cable 10 between the processing unit 101 and the modulator valve 7 of the feeding assembly 3 to supply the signal S3 instead of the signal S1 to the modulator valve 7.
- the processing unit 101 receives as an input the signal S1 and the signal S2, and outputs the signal S3 defined according to the signal S1 and the signal S2.
- the signal S3 is a control signal configured to control the flow rate of the fuel gas of the boiler 1.
- the processing unit 101 sets a theoretical value of the signal S2 according to the signal S1; and sets the signal S3 according to the difference between the theoretical value of the signal S2 and the actual value of the signal S2.
- the theoretical value of the signal S2 can be calculated through a look-up table that associates values of the signal S1 with theoretical values of the signal S2, or through one or more functions defining a theoretical value of the signal S2 starting from a signal value S1.
- the number 201 indicates a boiler having some components in common with the boiler 1 and indicated by the same reference numbers.
- the boiler 201 comprises a fan 11 arranged downstream of the burner 2 to evacuate the combustion exhaust gases.
- the boiler 201 comprises a watertight chamber 20 (shown in Figure 2 with a double line) housing the fuel gas burner 2.
- the control unit 4 is arranged outside the watertight chamber 20 and is coupled with the oxygen sensor 102 through a watertight grommet 21 configured to maintain the tightness of the watertight chamber 20.
- the modification procedure includes some additional steps if compared with the procedure shown in Figure 1 .
- the additional steps of the method are: opening the watertight chamber 20 to insert the oxygen sensor 102; passing the cable of the signal S2 within the grommet 21; and closing the watertight chamber 20.
- the boiler 201 comprises a fitting element arranged between the burner 2 and the stack 5.
- the retrofit assembly 100 comprises a fitting element 103 comprising the oxygen sensor 102 secured thereto and having the same size of the fitting element.
- the method for the replacement of the fitting element includes the steps of removing the originally installed fitting element and installing the fitting element 103 comprising the oxygen sensor 102.
- the boiler 201 does not include the fitting element and the retrofit assembly 100 does not include the fitting element 103.
- the procedure for installing the oxygen sensor 102 involves the step of drilling the stack 5 and inserting the oxygen sensor 102 in the hole.
- the oxygen sensor 102 comprises fastening means configured to be fixed to the outlet of the stack 5 to hold firmly into position the oxygen sensor 102 inside the stack 5.
- the procedure includes the step of inserting the oxygen sensor 102 inside the stack 5 and of rigidly coupling it with the outlet of the stack 5.
- the oxygen sensor is replaced by a mass flow rate sensor 302.
- the mass flow rate sensor 302 detects the mass flow rate (kg/s) of the fuel gas fed into the burner 2, and is arranged upstream of the burner 2. Accordingly, the signal S2 is correlated to the mass flow rate of the fuel gas at the inlet of the burner 2.
- the mass flow rate sensor 302 is arranged between the modulator valve 7 and the burner 2.
- the method for modifying the gas boiler comprises the step of inserting the mass flow rate sensor 302 between the modulator valve 7 and the burner 2, and coupling the mass flow rate sensor 302 with the processing unit 101.
- the boiler 301 has a watertight chamber like the boiler 201.
- the number 401 indicates a premixed boiler having some components in common with the boiler 201 and indicated by the same reference numbers.
- the boiler 401 includes a feeding assembly 403 configured so that the oxygen and the fuel gas are mixed with a certain proportion prior to combustion. In this way, the combustion is optimally regulated with regard to the ratio between fuel gas and oxygen. This mixing is usually carried out through a venturi duct, where air enters on the one side and fuel gas enters on the other side, thus defining a precise proportion between the two fluids.
- the boiler 401 comprises a watertight chamber 420 housing the fuel gas burner 2 and the feeding assembly 403 for supplying fuel gas to the burner 2.
- the control unit 4 is arranged outside the watertight chamber 420 and is coupled with the feeding assembly 403 through a watertight grommet 421 configured to maintain the tightness of the watertight chamber 420.
- the feeding assembly 403 is arranged inside a watertight chamber 420 and comprises a pneumatic valve 411 and a fan 412 arranged upstream of the burner 2 and downstream of the pneumatic valve 411.
- the fan 412 is controlled by the control unit 4 according to a signal S4 indicating the number of revolutions of the fan 412.
- the feeding assembly 403 of the boiler 301 includes a pneumatic valve 411 (already installed in the boiler).
- the retrofit assembly 100 comprises a flow rate adjustment device 104 configured to be installed downstream of the pneumatic valve 411, to receive the signal S3 and to adjust a fuel gas flow rate according to the signal S3.
- the method for modifying the boiler 401 in this case includes the following steps: opening the watertight chamber 420; inserting the oxygen sensor 102 downstream of the burner 2, in particular between the heat exchanger 6 and the outlet of the stack 5; inserting a flow rate adjustment device 104 into the feeding assembly 403 downstream of the pneumatic valve 411 along a conduit 425 connecting the pneumatic valve 411 to the burner 2; intercepting the signal S4 of the feeding assembly 403; connecting the signal S4 to the processing unit 101 and to the fan 412; connecting the oxygen sensor 102 to the processing unit 101 to supply the signal S2 to the processing unit 101; connecting the processing unit 101 to the flow rate adjustment device 104 to supply the signal S3 to the flow rate adjustment device 104 for controlling the fuel gas flow rate through the signal S3 and closing the watertight chamber 20.
- the signal S3 is a voltage or current signal.
- the signal S4 is simply taken without being replaced by other signals to the fan 412, in other words, the signal S4 is provided to both the fan 412 and the processing unit 102 of the retrofit assembly 100.
- the fan 412 is controlled by the signal S4 also after the modification of the boiler 401.
- the processing unit 101 receives as input the signal S4 and the signal S2 (supplied by the oxygen sensor 102) and outputs the signal S4 and the signal S3 processing the signal S4 and the signal S2.
- the signal S3 is a control signal for controlling the fuel gas flow rate of the boiler 301.
- the processing unit 102 defines a theoretical value of the signal S2 according to the signal S4; and defines the signal S3 according to the difference between the theoretical value of the signal S2 and the actual value of the signal S2.
- the theoretical value of the signal S2 can be calculated through a look-up table associating values of the signal S4 with theoretical values of the signal S2, or through one or more functions defining a theoretical value of the signal S2 starting from the value of the signal S4.
- the retrofit assembly 100 comprises a stepper valve 105 instead of the flow rate adjustment device.
- the stepper valve 105 is configured to be installed instead of the pneumatic valve 411.
- the method for modifying the boiler 401 includes the step of replacing the pneumatic valve 411 with the stepper valve 105.
- the processing unit 101 is connected to the stepper valve 105 to supply the signal S3.
- the stepper valve 105 regulates the fuel gas flow rate according to the signal S3.
- the signal S3 is a digital signal, in particular a step pulse.
- the method for modifying the boiler 401 includes the steps of removing the pneumatic valve 411, installing the stepper valve 105 instead of the pneumatic valve 411 and supplying the signal S3 to the stepper valve 105.
- the stepper valve 105 is coupled with the processing unit 101 to receive the signal S3; and it regulates the fuel gas flow rate according to the signal S3.
- the retrofit assembly 100 comprises a modulator valve 106 instead of the flow rate adjustment device.
- the modulator valve 106 is configured to be installed instead of the pneumatic valve 411.
- the method for modifying the boiler 401 includes the step of replacing the pneumatic valve 411 with the modulator valve 106.
- the processing unit 101 is connected to the modulator valve 106 to supply the signal S3.
- the modulator valve 106 regulates the fuel gas flow rate according to the signal S3.
- the signal S3 is preferably a current signal.
- the method for modifying the boiler 401 includes the steps of removing the pneumatic valve 411, installing the modulator valve 106 instead of the pneumatic valve 411 and supplying the signal S3 to the modulator valve 106.
- the modulator valve 106 is coupled with the processing unit 101 to receive the signal S3; and it regulates the fuel gas flow rate according to the signal S3.
- the retrofit assembly 100 comprises a controllable pneumatic valve 108 configured to be installed instead of the pneumatic valve 411.
- the method for modifying the boiler 401 includes the steps of removing the pneumatic valve 411, installing the controllable pneumatic valve 108 instead of the pneumatic valve 411 and connecting the processing unit 101 to the controllable pneumatic valve 108 to supply the signal S3 to the pneumatic valve 108.
- the controllable pneumatic valve 108 regulates the fuel gas flow rate according to the signal S3.
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- 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)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
- The present invention relates to a retrofit assembly for a fuel gas boiler and a method for modifying a fuel gas boiler installed in a heating plant.
- In particular, the retrofit assembly adjusts the fuel gas flow rate in a fuel gas boiler.
- As already known, the existing fuel gas boilers comprise a gas burner, a feeding assembly for feeding fuel gas to the burner, a control unit for controlling the feeding assembly and configured to regulate the combustion process according to the thermal power demand.
- In most of the currently installed boilers, the combustion control unit is configured to operate according to a fixed Wobbe index, predefined in the planning phase. Consequently, the fuel gas boilers fed by methane tolerate small variations of the methane Wobbe index. As already known, the Wobbe index is the ratio between the maximum calorific value and the square root of the specific gravity of a fuel gas (density related to the one of the air), and is used to compare the calorific value of different fuel mixtures in a fuel gas boiler.
- The European market is developing new regulations aiming to allow the supply of fuel gas from multiple sources. Unfortunately, not all of these sources are able to guarantee the same quality level of fuel gas, namely the same Wobbe index. In contrast, the variability of the Wobbe index can cause problems on the already installed fuel gas boilers. In fact, a significant variation in the Wobbe index determines a worsening of the yield, an increase of the polluting emissions, such as carbon monoxide, as well as problems in the ignition phase and noise.
- The purpose of the present invention is to provide a retrofit assembly for a fuel gas boiler that mitigates at least one of the described drawbacks, in other words that reduces polluting emissions and/or increases the yield and/or reduces the problems in the ignition phase.
- Therefore, the present invention provides a retrofit assembly for a fuel gas boiler; the fuel gas boiler comprising a fuel gas burner, a feeding assembly for supplying fuel gas to the burner, a control unit for controlling the feeding assembly; the retrofit assembly comprising a processing unit configured to acquire a first control signal of the feeding assembly configured to control the feeding assembly; a second signal correlated to the composition of the exhaust gas or fuel gas; the processing unit being configured to define a third control signal of the feeding assembly configured to control the feeding assembly and based on the second signal and on the first signal; the retrofit assembly being configured to be installed in the boiler and to control the fuel gas flow rate by means of the third signal.
- Thanks to the present invention, the retrofit assembly increases the boiler yield and decreases the polluting emissions by acting on the feeding assembly to modify the supply of fuel gas according to the composition of the exhaust gas or the fuel gas, thus obtaining an optimum combustion and reducing fuel consumption and emissions.
- According to a preferred embodiment, the processing unit is configured to define a theoretical value of the second signal according to the first signal; and to define the third signal according to the difference between the defined theoretical value of the second signal and the actual value of the second signal.
- According to another preferred embodiment, the retrofit assembly comprises an oxygen sensor configured to detect the exhaust gases of the boiler and to define the second signal correlated to the composition of the exhaust gases.
- Thanks to the present invention, the installed boiler is modified by inserting an oxygen sensor downstream of the fuel gas burner; in this way, the performance of the fuel gas boiler is improved by the use of the second signal, which is an index of the combustion quality. The processing unit thus modifies the type of control of the fuel gas boiler already installed in a heating plant from an open loop control to a closed loop control. In other words, the boiler will have a feedback control with respect to the combustion process.
- According to another preferred embodiment, the boiler comprises a stack downstream of the burner and a first fitting element arranged between the burner and the stack; the retrofit assembly comprising a second fitting element comprising the oxygen sensor fixed thereto and configured to be installed between the burner and the stack to replace the first fitting element.
- According to another preferred embodiment, the oxygen sensor is configured to be inserted in a hole of the stack. According to another preferred embodiment, the oxygen sensor comprises fastening means configured to be fixed to the outlet of the stack to hold firmly into position the oxygen sensor inside the stack.
- According to another preferred embodiment, the feeding assembly of the boiler comprises a pneumatic valve; the retrofit assembly comprising a flow rate adjustment device configured to be installed downstream of the pneumatic valve to receive the third signal and to adjust a fuel gas flow rate according to the third signal.
- According to another preferred embodiment, the feeding assembly of the boiler comprises a pneumatic valve; the retrofit assembly comprising a modulator valve configured to be installed instead of the pneumatic valve for receiving the third signal and for adjusting the flow rate according to the third signal.
- According to another preferred embodiment, the feeding assembly of the boiler comprises a pneumatic valve; the retrofit assembly comprising a controllable pneumatic valve configured to be installed instead of the pneumatic valve for receiving the third signal and for adjusting the flow rate according to the third signal.
- According to another preferred embodiment, the feeding assembly comprises a fan and the first signal is a value of the number of revolutions of the fan.
- According to another preferred embodiment, the feeding assembly comprises a modulator valve; and the first signal and the third signal are current values of the modulator valve.
- According to another preferred embodiment, the boiler comprises a watertight chamber housing the fuel gas burner and the feeding assembly for supplying fuel gas to the burner; the control unit being arranged outside the watertight chamber and being coupled with the feeding assembly through a watertight grommet configured to maintain the tightness of the watertight chamber; and wherein the retrofit assembly is preferably arranged outside the watertight chamber and is coupled with the feeding assembly through the watertight grommet.
- Another object of the present invention is to provide a method for modifying a fuel gas boiler installed in a heating plant which is able to solve the aforesaid problems of currently installed boilers to increase the performance of the installed boiler.
- The present invention therefore provides a method for modifying a fuel gas boiler installed in a heating plant; the boiler comprising a fuel gas burner, a feeding assembly for feeding fuel gas to the burner, a control unit for controlling the flow rate of fuel gas of the feeding assembly; the method comprising the following steps: intercepting a first control signal of the feeding assembly configured to control the feeding assembly; detecting a second signal correlated to the composition of the exhaust gas or fuel gas; supplying a third control signal of the feeding assembly configured to control the feeding assembly and defined according to the second signal and to the first signal; and controlling the feeding assembly by means of the third signal.
- The present invention increases the performance of the installed boiler with respect to a combustion optimization without having to replace the boiler, thereby reducing intervention times and costs. Consequently, the thus modified boiler will have a higher yield and will release lower polluting emissions.
- According to a preferred embodiment, the method comprises the step of defining a theoretical value of the second signal according to the first signal; and defining the third signal according to the difference between the defined theoretical value of the second signal and the actual value of the second signal.
- According to another preferred embodiment, the method comprises the step of installing an oxygen sensor configured to define the signal correlated to the composition of the exhaust gas.
- According to another preferred embodiment, the boiler comprises a stack downstream of the burner and a first fitting element between the burner and the stack; the method comprising the step of removing the first preinstalled fitting element and of installing a second fitting element comprising the oxygen sensor.
- According to another preferred embodiment, the boiler comprises a stack downstream of the burner; the method comprising the step of drilling the stack and inserting the oxygen sensor in the hole.
- According to another preferred embodiment, the boiler comprises a stack downstream of the burner; the method comprising the step of inserting the oxygen sensor inside the stack and rigidly coupling it with the outlet of the stack.
- According to another preferred embodiment, the feeding assembly comprises a modulator valve, and the first signal is a modulation signal of the modulator valve of the feeding assembly; the method comprising the step of sending the third signal to the modulator valve.
- According to another preferred embodiment, the boiler feeding assembly comprises a pneumatic valve; the method comprising the step of installing a flow rate adjustment device downstream of the pneumatic valve; and of providing the third signal to the flow rate adjustment device.
- According to another preferred embodiment, the boiler feeding assembly comprises a pneumatic valve; the method comprising the step of replacing the pneumatic valve with a stepper valve and of supplying the third modified signal to the stepper valve.
- According to another preferred embodiment, the boiler feeding assembly comprises a pneumatic valve; the method comprising the step of replacing the pneumatic valve with a modulator valve and of supplying the third signal to the modulator valve.
- According to another preferred embodiment, the boiler feeding assembly comprises a pneumatic valve; the method comprising the step of replacing the pneumatic valve with a controllable pneumatic valve and of supplying the third signal to the controllable pneumatic valve.
- According to another preferred embodiment, the feeding assembly comprises a fan, and the first signal is a signal correlated to the number of revolutions of the fan.
- According to another preferred embodiment, the boiler comprises a watertight chamber housing the gas burner and the feeding assembly for supplying fuel gas to the burner; the control unit being arranged outside the watertight chamber and being coupled with the feeding assembly through a watertight grommet configured so as to maintain the tightness of the watertight chamber; the method comprising the step of opening the watertight chamber to intercept the first signal and of closing the watertight chamber and preferably using the grommet to transmit the third signal inside the watertight chamber.
- Further characteristics and advantages of the present invention will become clear from the following description of its preferred embodiments, with reference to the figures of the accompanying drawings, wherein:
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Figure 1 is a schematic view, with parts removed for clarity's sake, of a fuel gas boiler with modified atmospheric combustion with a retrofit assembly according to a first embodiment of the present invention; -
Figure 2 is a schematic view, with parts removed for clarity's sake, of a modified watertight fuel gas boiler with atmospheric combustion with a retrofit assembly according to a second embodiment of the present invention; -
Figure 3 is a schematic view, with parts removed for clarity's sake, of a modified fuel gas boiler with atmospheric combustion with a retrofit assembly according to a third embodiment of the present invention; -
Figure 4 is a schematic view, with parts removed for clarity's sake, of a modified fuel gas boiler with premixed combustion with a retrofit assembly according to a fourth embodiment of the present invention; -
Figure 5 is a block diagram of a detail ofFigure 4 ; -
Figure 6 is a block diagram of an alternative embodiment ofFigure 5 ; -
Figure 7 is a block diagram of an alternative embodiment ofFigure 5 ; and -
Figure 8 is a block diagram of an alternative embodiment ofFigure 5 . - With reference to
Figure 1, 1 indicates as a whole a fuel gas boiler installed in a heating plant. Theboiler 1 comprises afuel gas burner 2, afeeding assembly 3 for supplying the fuel gas to theburner 2, and acontrol unit 4 for controlling the fuel gas flow rate of thefeeding assembly 3, astack 5 to evacuate the exhaust gas of theburner 2 to the outside and aheat exchanger 6 for heating a fluid by means of theburner 2. - The
boiler 1 is of the atmospheric combustion type, and thefeeding assembly 3 comprises amodulator valve 7 which is configured to be controlled according to the values of the control signal S1, the control signal S1 preferably being a current or voltage signal of the fuel gas flow rate. - Again with reference to
Figure 1 , thenumber 100 indicates the retrofit assembly for thefuel gas boiler 1, which is installed in theboiler 1, in turn installed in a heating plant, to increase its performance. Theretrofit assembly 100 comprises aprocessing unit 101 configured to acquire the signal S1 of thecontrol unit 4; and anoxygen sensor 102 configured to be installed downstream of theburner 2 and to provide a signal S2 related to the composition of the exhaust gas. - The method for modifying the installed
boiler 1 comprises the step of installing theprocessing unit 101 inside theboiler 1, and in particular of intercepting the control signal S1 of thefeeding assembly 3; and of controlling themodulator valve 7 through a signal S3. In more detail, the method provides the step of disconnecting acable 9 coupling thecontrol unit 4 with the modulator valve 7 (connection of the original configuration of the installed boiler 1) to supply the signal S1 to themodulator valve 7 of thefeeding assembly 3; of coupling saidcable 9 with theprocessing unit 101 of theretrofit assembly 100; and of coupling anadditional cable 10 between theprocessing unit 101 and themodulator valve 7 of thefeeding assembly 3 to supply the signal S3 instead of the signal S1 to themodulator valve 7. - The
processing unit 101 receives as an input the signal S1 and the signal S2, and outputs the signal S3 defined according to the signal S1 and the signal S2. The signal S3 is a control signal configured to control the flow rate of the fuel gas of theboiler 1. Theprocessing unit 101 sets a theoretical value of the signal S2 according to the signal S1; and sets the signal S3 according to the difference between the theoretical value of the signal S2 and the actual value of the signal S2. By way of nonlimiting example, the theoretical value of the signal S2 can be calculated through a look-up table that associates values of the signal S1 with theoretical values of the signal S2, or through one or more functions defining a theoretical value of the signal S2 starting from a signal value S1. - In an alternative embodiment of the present invention shown in
Figure 2 , thenumber 201 indicates a boiler having some components in common with theboiler 1 and indicated by the same reference numbers. In addition, theboiler 201 comprises afan 11 arranged downstream of theburner 2 to evacuate the combustion exhaust gases. - The
boiler 201 comprises a watertight chamber 20 (shown inFigure 2 with a double line) housing thefuel gas burner 2. Thecontrol unit 4 is arranged outside thewatertight chamber 20 and is coupled with theoxygen sensor 102 through awatertight grommet 21 configured to maintain the tightness of thewatertight chamber 20. In this case, the modification procedure includes some additional steps if compared with the procedure shown inFigure 1 . The additional steps of the method are: opening thewatertight chamber 20 to insert theoxygen sensor 102; passing the cable of the signal S2 within thegrommet 21; and closing thewatertight chamber 20. - The
boiler 201 comprises a fitting element arranged between theburner 2 and thestack 5. Theretrofit assembly 100 comprises afitting element 103 comprising theoxygen sensor 102 secured thereto and having the same size of the fitting element. The method for the replacement of the fitting element includes the steps of removing the originally installed fitting element and installing thefitting element 103 comprising theoxygen sensor 102. - In an alternative embodiment of the present invention, the
boiler 201 does not include the fitting element and theretrofit assembly 100 does not include thefitting element 103. The procedure for installing theoxygen sensor 102 involves the step of drilling thestack 5 and inserting theoxygen sensor 102 in the hole. - In another alternative embodiment of the present invention, the
oxygen sensor 102 comprises fastening means configured to be fixed to the outlet of thestack 5 to hold firmly into position theoxygen sensor 102 inside thestack 5. In said embodiment, the procedure includes the step of inserting theoxygen sensor 102 inside thestack 5 and of rigidly coupling it with the outlet of thestack 5. - In an alternative embodiment with respect to the previous two embodiments, shown in
Figure 3 and indicated with thereference number 301, the oxygen sensor is replaced by a massflow rate sensor 302. The massflow rate sensor 302 detects the mass flow rate (kg/s) of the fuel gas fed into theburner 2, and is arranged upstream of theburner 2. Accordingly, the signal S2 is correlated to the mass flow rate of the fuel gas at the inlet of theburner 2. In more detail, the massflow rate sensor 302 is arranged between themodulator valve 7 and theburner 2. - Consequently, the method for modifying the gas boiler, already installed in a plant, comprises the step of inserting the mass
flow rate sensor 302 between themodulator valve 7 and theburner 2, and coupling the massflow rate sensor 302 with theprocessing unit 101. In an embodiment not shown in the attached figures, theboiler 301 has a watertight chamber like theboiler 201. - In an alternative embodiment of the present invention shown in
Figure 4 , thenumber 401 indicates a premixed boiler having some components in common with theboiler 201 and indicated by the same reference numbers. - The
boiler 401 includes a feedingassembly 403 configured so that the oxygen and the fuel gas are mixed with a certain proportion prior to combustion. In this way, the combustion is optimally regulated with regard to the ratio between fuel gas and oxygen. This mixing is usually carried out through a venturi duct, where air enters on the one side and fuel gas enters on the other side, thus defining a precise proportion between the two fluids. Theboiler 401 comprises awatertight chamber 420 housing thefuel gas burner 2 and the feedingassembly 403 for supplying fuel gas to theburner 2. Thecontrol unit 4 is arranged outside thewatertight chamber 420 and is coupled with the feedingassembly 403 through awatertight grommet 421 configured to maintain the tightness of thewatertight chamber 420. Moreover, the feedingassembly 403 is arranged inside awatertight chamber 420 and comprises apneumatic valve 411 and afan 412 arranged upstream of theburner 2 and downstream of thepneumatic valve 411. Thefan 412 is controlled by thecontrol unit 4 according to a signal S4 indicating the number of revolutions of thefan 412. - With reference to
Figures 4 and5 , the feedingassembly 403 of theboiler 301 includes a pneumatic valve 411 (already installed in the boiler). Theretrofit assembly 100 comprises a flowrate adjustment device 104 configured to be installed downstream of thepneumatic valve 411, to receive the signal S3 and to adjust a fuel gas flow rate according to the signal S3. In more detail, the method for modifying theboiler 401 in this case includes the following steps: opening thewatertight chamber 420; inserting theoxygen sensor 102 downstream of theburner 2, in particular between theheat exchanger 6 and the outlet of thestack 5; inserting a flowrate adjustment device 104 into the feedingassembly 403 downstream of thepneumatic valve 411 along aconduit 425 connecting thepneumatic valve 411 to theburner 2; intercepting the signal S4 of the feedingassembly 403; connecting the signal S4 to theprocessing unit 101 and to thefan 412; connecting theoxygen sensor 102 to theprocessing unit 101 to supply the signal S2 to theprocessing unit 101; connecting theprocessing unit 101 to the flowrate adjustment device 104 to supply the signal S3 to the flowrate adjustment device 104 for controlling the fuel gas flow rate through the signal S3 and closing thewatertight chamber 20. The signal S3 is a voltage or current signal. - In more detail, the signal S4 is simply taken without being replaced by other signals to the
fan 412, in other words, the signal S4 is provided to both thefan 412 and theprocessing unit 102 of theretrofit assembly 100. Thefan 412 is controlled by the signal S4 also after the modification of theboiler 401. In this case, theprocessing unit 101 receives as input the signal S4 and the signal S2 (supplied by the oxygen sensor 102) and outputs the signal S4 and the signal S3 processing the signal S4 and the signal S2. The signal S3 is a control signal for controlling the fuel gas flow rate of theboiler 301. Theprocessing unit 102 defines a theoretical value of the signal S2 according to the signal S4; and defines the signal S3 according to the difference between the theoretical value of the signal S2 and the actual value of the signal S2. The theoretical value of the signal S2 can be calculated through a look-up table associating values of the signal S4 with theoretical values of the signal S2, or through one or more functions defining a theoretical value of the signal S2 starting from the value of the signal S4. - According to an alternative embodiment of the present invention shown in
Figure 6 , theretrofit assembly 100 comprises astepper valve 105 instead of the flow rate adjustment device. Thestepper valve 105 is configured to be installed instead of thepneumatic valve 411. The method for modifying theboiler 401 includes the step of replacing thepneumatic valve 411 with thestepper valve 105. Theprocessing unit 101 is connected to thestepper valve 105 to supply the signal S3. Thestepper valve 105 regulates the fuel gas flow rate according to the signal S3. The signal S3 is a digital signal, in particular a step pulse. The method for modifying theboiler 401 includes the steps of removing thepneumatic valve 411, installing thestepper valve 105 instead of thepneumatic valve 411 and supplying the signal S3 to thestepper valve 105. Thestepper valve 105 is coupled with theprocessing unit 101 to receive the signal S3; and it regulates the fuel gas flow rate according to the signal S3. - According to an alternative embodiment of the present invention shown in
Figure 7 , theretrofit assembly 100 comprises amodulator valve 106 instead of the flow rate adjustment device. Themodulator valve 106 is configured to be installed instead of thepneumatic valve 411. The method for modifying theboiler 401 includes the step of replacing thepneumatic valve 411 with themodulator valve 106. Theprocessing unit 101 is connected to themodulator valve 106 to supply the signal S3. Themodulator valve 106 regulates the fuel gas flow rate according to the signal S3. The signal S3 is preferably a current signal. The method for modifying theboiler 401 includes the steps of removing thepneumatic valve 411, installing themodulator valve 106 instead of thepneumatic valve 411 and supplying the signal S3 to themodulator valve 106. Themodulator valve 106 is coupled with theprocessing unit 101 to receive the signal S3; and it regulates the fuel gas flow rate according to the signal S3. - According to an alternative embodiment of the present invention shown in
Figure 8 , theretrofit assembly 100 comprises a controllablepneumatic valve 108 configured to be installed instead of thepneumatic valve 411. The method for modifying theboiler 401 includes the steps of removing thepneumatic valve 411, installing the controllablepneumatic valve 108 instead of thepneumatic valve 411 and connecting theprocessing unit 101 to the controllablepneumatic valve 108 to supply the signal S3 to thepneumatic valve 108. The controllablepneumatic valve 108 regulates the fuel gas flow rate according to the signal S3. Finally, it is clear that the described retrofit assembly for a fuel gas boiler can be subject to modifications, variations and improvements without departing from the scope of the appended claims.
Claims (21)
- A retrofit assembly for a fuel gas boiler; the fuel gas boiler (1, 201, 301, 401) comprising a fuel gas burner (2), a feeding assembly (3, 403) for feeding fuel gas to the burner (2), a control unit (4) for controlling the feeding assembly (3, 403); the retrofit assembly (100) comprising a processing unit (101) configured to acquire a first control signal (S1; S4) of the feeding assembly (3, 403) configured to control the feeding assembly (3, 403); a second signal (S2) correlated to the exhaust gas or fuel gas composition; the processing unit (101) being configured to define a third control signal (S3) of the feeding assembly (3, 403) configured to control the feeding assembly (3, 403) and based on the second signal (S2) and on the first signal (S1); the retrofit assembly (100) being configured to be installed in the boiler (1, 201, 301, 401) and to control the flow rate of the fuel gas by means of the third signal (S3).
- A retrofit assembly according to Claim 1, comprising an oxygen sensor (102) configured to detect the exhaust gases of the boiler and to define the second signal (S2) correlated to the composition of the exhaust gases.
- A retrofit assembly according to claim 2, wherein the oxygen sensor (102) comprises fastening means configured to be fixed to the outlet of the stack (5) to hold the oxygen sensor (102) firmly into position within the stack (5).
- A retrofit assembly according to Claim 1, wherein the retrofit assembly (100) comprises a mass flow rate sensor (302) configured to detect the fuel gas composition and to define the second signal (S2) correlated to the fuel gas composition; the mass flow rate sensor (302) being preferably arranged between the feeding assembly (3) and the burner (2).
- A retrofit assembly according to any one of Claims 1 to 4, wherein the feeding assembly (403) of the boiler (1) comprises a pneumatic valve (411); the retrofit assembly (100) comprising a flow rate adjustment device (104) configured to be installed downstream of the pneumatic valve (411) to receive the third signal (S3) and to adjust a fuel gas flow rate according to the third signal (S3).
- A retrofit assembly according to any one of Claims 1 to 3, wherein the feeding assembly (403) of the boiler (401) comprises a pneumatic valve; the retrofit assembly (100) comprising a stepper valve (105) configured to be installed instead of the pneumatic valve to receive the third signal (S3) and to adjust the flow rate according to the third signal (S3).
- A retrofit assembly according to any one of Claims 1 to 3, wherein the feeding assembly (403) of the boiler (401) comprises a pneumatic valve; the retrofit assembly (100) comprising a modulator valve (106) configured to be installed instead of the pneumatic valve to receive the third signal (S3) and to adjust the flow rate according to the third signal (S3).
- A retrofit assembly according to any one of Claims 1 to 3, wherein the feeding assembly (403) of the boiler (401) comprises a pneumatic valve; the retrofit assembly (100) comprising a controllable pneumatic valve (108) configured to be installed instead of the pneumatic valve to receive the third signal (S3) and to adjust the flow rate according to the third signal (S3).
- A retrofit assembly according to any one of Claims 1 to 6, wherein the feeding assembly (403) comprises a fan (412); and wherein the first signal (S4) is an rpm value of the fan (12).
- A retrofit assembly according to any one of Claims 1 to 3, wherein the feeding assembly (3) comprises a modulator valve (7); and wherein the first signal (S1) and the third signal (S3) are a current value of the modulator valve (7).
- A method for modifying a fuel gas boiler installed in a heating plant; the boiler (1, 201, 301, 401) comprising a fuel gas burner (2), a feeding assembly (3; 403) for feeding fuel gas to the burner (2), a control unit (4) for controlling the flow rate of the fuel gas of the feeding assembly (3); the method comprising the steps of: intercepting a first control signal (S1; S4) of the feeding assembly (3; 403) configured to control the feeding assembly (3; 403); detecting a second signal (S2) correlated to the exhaust gas or fuel gas composition; supplying a third control signal (S3) to the feeding assembly (3; 403) configured to control the feeding assembly (3; 403) and defined according to the second signal (S2) and to the first signal (S1; S4); and controlling the feeding assembly (3; 403) by means of the third signal (S3).
- A method according to Claim 11, comprising the step of installing an oxygen sensor (102) configured to define the signal correlated to the composition of the exhaust gases.
- A method according to any one of Claims 11 to 12, wherein the boiler (1; 201, 301, 401) comprises a stack (5) downstream of the burner (2); the method comprising the step of inserting the oxygen sensor (102) within the stack (5) and of rigidly coupling it with the outlet of the stack (5).
- A method according to Claim 11, wherein the method comprises the step of installing a mass flow rate sensor (302) configured to detect the fuel gas composition and to define the second signal (S2) correlated to the fuel gas composition; said method preferably comprising the step of arranging the mass flow rate sensor (302) between the feeding assembly (3) and the burner (2).
- A method according to any one of Claims 11 to 14, wherein the feeding assembly (403) of the boiler (1) comprises a pneumatic valve (411); the method comprising the step of installing a flow rate adjustment device (104) downstream of the pneumatic valve (411); and of supplying the third signal (S3) to the flow rate adjustment device (104).
- A method according to any one of Claims 11 to 14, wherein the feeding assembly (403) of the boiler (401) comprises a pneumatic valve; the method comprising the step of replacing the pneumatic valve (411) with a stepper valve (105) and of supplying the third signal (S3) to the stepper valve (105).
- A method according to any one of Claims 11 to 14, wherein the feeding assembly (403) of the boiler (401) comprises a pneumatic valve; the method comprising the step of replacing the pneumatic valve with a modulator valve (106) and of supplying the third signal (S3) to the modulator valve (106).
- A method according to any one of Claims 11 to 14, wherein the feeding assembly (403) of the boiler (401) comprises a pneumatic valve; the method comprising the step of replacing the pneumatic valve with a controllable pneumatic valve (108) and of supplying the third signal (S3) to the controllable pneumatic valve (108).
- A method according to any one of Claims 11 to 14; wherein the feeding assembly (403) comprises a fan (412) and the first signal (S4) is the signal which controls the fan (12); the method comprising the step of intercepting the first signal (S4).
- A method according to any one of the preceding Claims 11 to 14, wherein the feeding assembly (3) comprises a modulator valve (7) and the first signal (S1) is a modulation signal of the modulator valve (7) of the feeding assembly (3), the method comprising the step of sending the third signal (S3) to the modulator valve (7).
- A method according to any one of the preceding Claims 11 to 20, wherein one or more of the preceding steps is carried out on the boiler (1; 201; 3021, 401), which has been previously installed in a heating plant and has been previously working, in order to improve its performance.
Applications Claiming Priority (2)
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ITMI20141256 | 2014-07-10 | ||
EP15176360.4A EP2966353B1 (en) | 2014-07-10 | 2015-07-10 | Method for modifying a fuel gas boiler |
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EP15176360.4A Division EP2966353B1 (en) | 2014-07-10 | 2015-07-10 | Method for modifying a fuel gas boiler |
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EP3524884A1 true EP3524884A1 (en) | 2019-08-14 |
EP3524884B1 EP3524884B1 (en) | 2023-09-20 |
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EP19166651.0A Active EP3524884B1 (en) | 2014-07-10 | 2015-07-10 | Method for modifying a fuel gas boiler |
EP15176360.4A Active EP2966353B1 (en) | 2014-07-10 | 2015-07-10 | Method for modifying a fuel gas boiler |
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EP15176360.4A Active EP2966353B1 (en) | 2014-07-10 | 2015-07-10 | Method for modifying a fuel gas boiler |
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EP (2) | EP3524884B1 (en) |
ES (2) | ES2963966T3 (en) |
PL (2) | PL3524884T3 (en) |
PT (1) | PT3524884T (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
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EP4296568A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Hydrogen retrofit kit assembly for a gaz burner |
EP4296574A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Retrofit kit assembly |
EP4296571A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Retrofit kit assembly |
EP4296572A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Retrofit kit assembly |
EP4296576A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Hydrogen retrofit kit assembly for a gaz burner |
EP4296569A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Hydrogen retrofit kit assembly for a gaz burner |
EP4296570A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Hydrogen retrofit kit assembly for a gaz burner |
EP4296575A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Electronic safety unit and retrofit kit assembly comprising the electronic safety unit |
EP4296573A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Retrofit kit assembly |
WO2023247686A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Retrofit kit assembly |
EP4317779A1 (en) | 2022-08-01 | 2024-02-07 | BDR Thermea Group B.V. | Retrofit kit assembly |
EP4317777A1 (en) | 2022-08-01 | 2024-02-07 | BDR Thermea Group B.V. | Retrofit kit assembly |
EP4317780A1 (en) | 2022-08-01 | 2024-02-07 | BDR Thermea Group B.V. | Retrofit kit assembly |
EP4317778A1 (en) | 2022-08-01 | 2024-02-07 | BDR Thermea Group B.V. | Retrofit kit assembly |
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2015
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- 2015-07-10 PT PT191666510T patent/PT3524884T/en unknown
- 2015-07-10 ES ES19166651T patent/ES2963966T3/en active Active
- 2015-07-10 EP EP19166651.0A patent/EP3524884B1/en active Active
- 2015-07-10 EP EP15176360.4A patent/EP2966353B1/en active Active
- 2015-07-10 PL PL15176360T patent/PL2966353T3/en unknown
- 2015-07-10 ES ES15176360T patent/ES2719834T3/en active Active
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EP0050840A1 (en) * | 1980-10-23 | 1982-05-05 | Karl Dungs GmbH & Co. | Process to adjust compound regulators for burners in heat-generating equipments |
EP1239220A2 (en) * | 2001-03-08 | 2002-09-11 | Robert Bosch Gmbh | Gas combustion apparatus for heating purpose |
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Cited By (26)
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EP4296568A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Hydrogen retrofit kit assembly for a gaz burner |
EP4296574A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Retrofit kit assembly |
EP4296571A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Retrofit kit assembly |
EP4296572A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Retrofit kit assembly |
EP4296576A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Hydrogen retrofit kit assembly for a gaz burner |
EP4296569A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Hydrogen retrofit kit assembly for a gaz burner |
EP4296570A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Hydrogen retrofit kit assembly for a gaz burner |
EP4296575A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Electronic safety unit and retrofit kit assembly comprising the electronic safety unit |
EP4296573A1 (en) | 2022-06-22 | 2023-12-27 | BDR Thermea Group B.V. | Retrofit kit assembly |
WO2023247686A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Retrofit kit assembly |
WO2023247685A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Retrofit kit assembly |
WO2023247687A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Hydrogen retrofit kit assembly for a gas burner |
WO2023247691A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Retrofit kit assembly |
WO2023247690A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Retrofit kit assembly |
WO2023247692A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Retrofit kit assembly |
WO2023247689A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Retrofit kit assembly |
WO2023247682A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Hydrogen-retrofit kit assembly for a gas combustion appliance |
WO2023247683A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Retrofit kit assembly |
WO2023247681A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Hydrogen retrofit kit assembly for a gas burner |
WO2023247679A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Hydrogen retrofit kit assembly for a gas burner |
WO2023247680A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Hydrogen retrofit kit assembly for a gas burner |
WO2023247684A1 (en) | 2022-06-22 | 2023-12-28 | Bdr Thermea Group B.V. | Retrofit kit assembly |
EP4317779A1 (en) | 2022-08-01 | 2024-02-07 | BDR Thermea Group B.V. | Retrofit kit assembly |
EP4317777A1 (en) | 2022-08-01 | 2024-02-07 | BDR Thermea Group B.V. | Retrofit kit assembly |
EP4317780A1 (en) | 2022-08-01 | 2024-02-07 | BDR Thermea Group B.V. | Retrofit kit assembly |
EP4317778A1 (en) | 2022-08-01 | 2024-02-07 | BDR Thermea Group B.V. | Retrofit kit assembly |
Also Published As
Publication number | Publication date |
---|---|
EP2966353A1 (en) | 2016-01-13 |
EP3524884B1 (en) | 2023-09-20 |
ES2719834T3 (en) | 2019-07-16 |
EP2966353B1 (en) | 2019-04-03 |
PT3524884T (en) | 2023-10-20 |
PL2966353T3 (en) | 2019-07-31 |
PL3524884T3 (en) | 2024-04-08 |
ES2963966T3 (en) | 2024-04-03 |
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