EP4058727A1 - Verfahren und vorrichtung zur regelung der verbrennung in feuerungsanlagen - Google Patents
Verfahren und vorrichtung zur regelung der verbrennung in feuerungsanlagenInfo
- Publication number
- EP4058727A1 EP4058727A1 EP20804255.6A EP20804255A EP4058727A1 EP 4058727 A1 EP4058727 A1 EP 4058727A1 EP 20804255 A EP20804255 A EP 20804255A EP 4058727 A1 EP4058727 A1 EP 4058727A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- combustion
- air
- temperature
- oxygen
- furnace
- 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.)
- Pending
Links
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000003570 air Substances 0.000 claims abstract description 175
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 47
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000001301 oxygen Substances 0.000 claims abstract description 46
- 206010022000 influenza Diseases 0.000 claims abstract description 4
- 239000012080 ambient air Substances 0.000 claims abstract description 3
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- 239000007789 gas Substances 0.000 claims description 33
- 230000001105 regulatory effect Effects 0.000 claims description 20
- 230000033228 biological regulation Effects 0.000 claims description 19
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 13
- 230000002000 scavenging effect Effects 0.000 claims description 13
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/08—Regulating air supply or draught by power-assisted systems
- F23N3/082—Regulating air supply or draught by power-assisted systems using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B60/00—Combustion apparatus in which the fuel burns essentially without moving
- F23B60/02—Combustion apparatus in which the fuel burns essentially without moving with combustion air supplied through a grate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L13/00—Construction of valves or dampers for controlling air supply or draught
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/002—Regulating air supply or draught 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
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
- F23N5/102—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
- F23N2225/10—Measuring temperature stack temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
- F23N2235/10—Air or combustion gas valves or dampers power assisted, e.g. using electric motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
- F24B1/00—Stoves or ranges
- F24B1/02—Closed stoves
- F24B1/028—Closed stoves with means for regulating combustion
Definitions
- the invention relates to a method and a device, which can be used in particular in this method, for regulating the combustion of fuels, such as solid fuels, in combustion systems, for example in individual combustion systems, such as hand-loaded individual combustion systems
- the combustion principle in single-room firing systems plays a major role in the combustion and emissions behavior.
- the optimization of the combustion and emission behavior can be achieved through automatic loading in which the fuel throughput and the appropriate amount of combustion air can be set precisely and precisely.
- Automatic loading of logs is technically possible, but cannot be implemented due to the general, usage and operating conditions of the individual room firing systems.
- Manual loading through a lock system without opening the combustion chamber door and thus suddenly cooling the combustion chamber is technically possible and can also be used in single-room firing systems.
- the lock system not only keeps the combustion chamber warm, but also stabilizes the pressure conditions there in such a way that no flue gas or pollution can occur in the installation room regardless of the pressure and flow conditions in the combustion system.
- the sluice system enables uniform loading (support regime) to be implemented, which results in a significant reduction in emissions.
- the combustion process takes place differently depending on the type of combustion air supply into the furnace and its flow direction and shape to the fuel.
- a combustion process can be described as favorable if it produces a fuel gas with favorable combustion properties and sufficient heat for the oxidation.
- Both high-energy (strong) and low-energy (weak) fuel gases lead to unfavorable combustion with numerous pollutants.
- the supply of combustion air into the lower area of the bed of embers leads to uncontrolled gasification, which requires a regulated, precise supply of the secondary air. Without an appropriately regulated secondary air supply, incomplete combustion occurs.
- a better design of the combustion process also includes the grading of the combustion air, so that not only controlled gasification, but also a rapid cooling of the active reaction zone can be avoided.
- the constructive and fluidic measures are measures with which favorable flow conditions with optimal oxidation conditions in the active reaction zone can be ensured over a longer period of time during the burn-up.
- the shape, volume and geometry of the combustion chamber and the afterburning chamber with the downstream exhaust flues play a major role in the oxidation process.
- correct positioning and distribution of the primary and secondary air openings makes a massive contribution to stabilization and consequently to improving the combustion quality.
- An optimal construction can be calculated and determined with a flow simulation.
- the combustion can also be controlled by technical control measures.
- the regulation of the combustion process in single-room firing systems takes place exclusively by regulating the combustion air, whereby a controlled thermal conversion of the fuel with proper combustion must be guaranteed.
- the regulation is intended to prevent the combustion process from falling into either a lack of oxygen or an excess of oxygen.
- the release of heat should take place in a more controlled manner, so that a high degree of heat utilization efficiency can be achieved with a high level of thermal comfort.
- the exhaust gas is fed into the catalytically coated structure (granulate fill, foam structure made of oxide and non-oxide ceramics, honeycomb, wire mesh or wire mesh).
- the flammable pollutants contained in the exhaust gas such. B. carbon monoxide (CO) and hydrocarbons (C n H m , VOCs, PAHs) come into contact with the catalytically active surface of the catalyst.
- CO carbon monoxide
- hydrocarbons C n H m , VOCs, PAHs
- the oxidation reactions through the catalyst can take place at a temperature greater than 300 ° C.
- These pollutants are converted into substances such as water and carbon dioxide through oxidation and are thus toxicologically reduced.
- the catalyst is not used up in the course of the oxidation. It only ensures that the reactions take place at a lower temperature level (already at 300 ° C instead of 500 ° C).
- catalytic oxidation processes When used in biomass furnaces, catalytic oxidation processes have the disadvantage that catalytic poisoning occurs during the combustion of unfavorable fuels due to high exposure to undesirable pollutants (such as halogens, sulfur, polymers, tar, soot and other aerosols). As a result, the catalytic effect is steadily reduced and completely eliminated over time.
- the catalytic coating also the washcoat
- the catalytic coating is exposed to high thermal and mechanical (erosion by the dust or high exhaust gas velocities) stress as well as strong temperature changes (from approx. 250 ° C to approx. 900 ° C) during operation or after several Operating hours damaged.
- the built-in technology (for thermal oxidation processes) is a technology that was developed by the Fraunhofer Institute for Building Physics IBP as part of a project funded by FNR.
- the operating principle of the built-in technology is based on the provision of favorable oxidation conditions during combustion within a defined built-in module.
- This module stores enough energy in the form of heat during combustion and automatically makes it available for thermal oxidation if the temperatures during combustion drop below certain limits (exhaust gas temperature ⁇ module temperature). Due to its special architecture, the built-in module ensures an intensive mixing of the combustible exhaust gas components with the combustion air as well as an extension of the active dwell time through multiple deflections or swirling of the exhaust gases.
- the stored energy is intended to prevent the oxidation of unburned components in the exhaust gas in unfavorable operating phases such as B. enable when placing wood and lead to a stable combustion process regardless of the dynamics of the combustion process.
- the built-in technology has a number of technical and conceptual advantages compared to the technologies currently used to reduce pollutants in small combustion systems, which can ensure that it can be implemented in practice. These advantages include, above all, the guarantee of safe operation without the need for intensive maintenance (once every two years), longevity (at least 5 years), low specific costs (less than 1.5 € per kilowatt system output), high technical integration capability and technical flexibility in terms of construction and operation and no need for operating energy.
- FKZ 03KB093A, Stuttgart 2017, 168 S; and Aleysa, M .: Conceptual, constructive and control measures for reducing pollutants and increasing the efficiency of log firing in practice, lecture in the 7th specialist colloquium Measures and technologies for reducing fine dust from biomass firing, Stuttgart,
- controllers in hand-loaded single-room firing systems leads to a corresponding increase in acquisition costs and requires a new concept for the warranty guarantees. With a large number of individual room firing systems, controllers that are prone to defects lead to unfavorable economic consequences. The use of sensitive sensors such as B. Lambda probes should therefore be avoided.
- the invention is therefore based on the object of a method for regulating the combustion in a single-room combustion system and a device for this purpose to provide that does not have the disadvantage of the prior art and with which, in particular, a safe and sustainable reduction in pollutant emissions, heat production suitable for mining and an increase in efficiency can be achieved.
- a method for regulating the combustion in combustion systems for example individual combustion systems, such as hand-loaded individual combustion systems, is proposed, which is characterized by the fact that the temperature in a combustion chamber area and / or in the exhaust flues of the combustion system and possibly in the exhaust gas as well as an energy balance of the During the combustion process in the combustion system, the combustion air and the exhaust gas, an oxygen coefficient is determined with which the primary and secondary combustion air flows and thus the thermal output as well as the combustion quality are regulated. This regulation can be done quickly.
- an oxygen coefficient is to be defined as a value which gives direct conclusions about the oxygen content in the active oxidation zone or the oxygen requirement for proper combustion.
- the optimal range for measuring the temperature for the control is the first flue gas draft after the flue gas baffle plate in the combustion chamber. This will reduce the influence of the Ember bed heat radiation on the temperature measurement is reduced and the temperature sensors are protected from thermal stress, especially when using unfavorable fuels.
- control concept is technically structured in such a way that it can serve as a manufacturer-independent standard application or as a universal standard solution. It can therefore not only be used for new, but also for existing old single-room heating systems with a reasonable amount of effort.
- the method according to the invention achieves a safe, sustainable reduction in pollutant emissions as well as an increase in the efficiency of the thermal conversion of the fuel and an improvement in the degree of utilization through needs-based heat production through the permanent detection of the ambient temperature:
- By regulating the combustion process low-pollutant and efficient combustion is achieved guaranteed by a more precise supply of the combustion air.
- optimal operation of the combustion system can be digitally explained in an intuitive, simple manner and the quality of the combustion can be recognized and assessed.
- the optimal operation of the combustion system results from the evaluation of the combustion quality thanks to the intelligence of the control. It is possible to collect statistical data and evaluate the functionality of the fireplace in practice.
- the method according to the invention is based on an energy balance method.
- the signals generated by the temperature sensor can be used to generate a virtual signal (so-called emission reference value: ERW signal) using other intelligent algorithms, which is used to evaluate the operation.
- ERW signal emission reference value
- the temperature in the furnace can be measured at at least one, for example two different points.
- the temperature in the combustion chamber can be at two points and possibly also at the Temperature in the exhaust gas can be measured.
- the temperature sensors mentioned above can be used for these measurements. In this way it is possible to determine the temperatures in a particularly reliable manner.
- the regulation of the primary air can take place in relation to the desired combustion output or the setting of favorable temperatures in the combustion chamber area for efficient and low-emission combustion.
- the amount of primary air supplied to the combustion process determines the intensity of the thermal conversion of the fuel and thus the thermal output of the combustion system.
- the heat demand of the installation room can also be taken into account and the primary air can be set accordingly, which means that heat can be produced as required and consequently the heat can not only be efficiently produced but also used efficiently.
- Grate air can be supplied in addition to the windshield rinsing air if this is not sufficient for combustion, as is the case when burning damp or very thick logs or when burning coal.
- the secondary air can be supplied in such a way that the oxygen content in the combustion chamber area is as favorable as possible, such as about 7% by volume to about 10% by volume, for example about 8% by volume to about 9% by volume for an optimal post-oxidation is.
- that can virtual oxygen signal is used, which can be generated every second by the algorithms on the basis of the measured temperatures.
- the fuel can be described as follows:
- the combustion air can be represented as follows:
- the exhaust gas can be represented by the following formula:
- a simplified energy balance for a combustion process is given above.
- the energy supplied to the combustion process via the fuel is equal to the energy generated during the thermal conversion and carried as heat via the exhaust gas.
- Adiabatic means that the thermal conversion takes place without any heat loss.
- Formula 1 results from this assumption:
- the combustion chamber or exhaust gas temperature described in Formula 1 represents the maximum temperature that can be achieved in the combustion chamber area during the thermal conversion or combustion of the fuel, which can be achieved under adiabatic conditions or without any heat losses and with a stoichiometric amount of combustion air (lambda : 1) is produced.
- the specific minimum amount of flue gas V R, min and the minimum specific stoichiometric amount of combustion air L min can be calculated approximately according to formula 5 and formula 6 or according to the approximations according to Rosin-Fehling:
- the calculation in formula 5 can also be carried out using the elemental composition of the fuel.
- the supply of combustion air can be controlled directly by the oxygen coefficient.
- the determination or calculation of the excess oxygen or the oxygen coefficient is not mandatory here.
- L min the minimum amount of air required for stoichiometric combustion
- L min and V r, min depend on the fuel properties, above all on the elemental composition, and are calculated directly from them.
- Lambda (after the integration of the correction factors K B , K F and K s , lambda can be referred to as the lambda coefficient n) is a function of three correction factors k B , k F and k s:
- K B correction factor of the fuel. This factor takes into account the deviation of the fuel used from the ideal fuel.
- k F Correction factor for extrapolating the non-adiabatic energy conversion operations that existed during combustion to adiabatic energy conversion operations. The factor k F therefore takes into account the thermal losses through the fireplace up to the temperature measuring point in the combustion chamber area.
- k s takes into account the ratio: primary air (SSL- PL) / secondary air (SSL-SL), which results from the windshield rinsing air and generally depends on the height of the window Hs. Here, the higher the viewing window of the fireplace or Hs is, the more the washing air can act as primary air.
- Non-adiabatic conditions during combustion in the fireplace can be taken into account using the correction factor k F:
- the correction factor k F is defined, which takes into account the heat emission (undesired heat losses) through the fireplace during the thermal conversion of fuel. It can have a value from one to four, depending on the type of individual room combustion system and the operating status.
- This value is determined by a function. The following applies here: the greater the heat release or heat loss in the combustion chamber area (from the flame zone to the end of the post-oxidation chamber) before the oxidation is complete, the higher the value of this factor.
- the functional parameters of the factor k F can, for example, be set automatically in a software of a control element by entering technical data of the type of fireplace once.
- the size (area and height) of the combustion chamber, the lining of the fireplace, the size and type of glazing of the combustion chamber door, etc. play a decisive role here.
- the type and properties of the fuel and the quality of the condition can be taken into account by the correction factor k B as follows:
- Correction factor k B takes into account the variation in the fuel properties.
- the value of this factor varies and is determined during the combustion by an integrated function in Calculated analogously to the factor k F , for example in an appropriately programmed control device, and changed in the control algorithms.
- the function of the correction factor k F is based on the combustion behavior or the changes in temperatures over time in the combustion chamber area.
- k B can have values from 0.80 to 1.2.
- the factors k F and k B also depend on one another.
- the dependency is also determined and taken into account, for example by being appropriately integrated into the software of a control device.
- the quality of the operating quality of the fireplace can be taken into account by the correction factor k q as described below:
- the factor k q plays a role in the regulation of the
- Combustion air supply only plays a subordinate role and is not relevant for the calculation of the excess oxygen in the combustion chamber area.
- the values of this factor can be varied and result from an integral calculation or change in the combustion chamber temperature over time with regard to a certain operating point of the combustion, whereby a point in time or a time range describes from which or in which the evaluation of the furnace temperature change takes place.
- the factor k B which If only the energy content of the fuel is taken into account, the factor k q gives direct conclusions about the loading regime (fuel quantity, number of logs loaded, fineness of the fuel, etc.).
- Equation 12 can be supplemented by the correction factor k s .
- SSL-PL primary air
- SSL-SL secondary air
- Formula 11 and Formula 12 provide the basis for controlling combustion systems with the help of temperature measurement in the furnace area or on the basis of the energy balance method according to the method according to the invention.
- the parameters specified above temperature measurement
- Energy balance method is used to determine the oxygen demand or to supply it to the process as well as to set the optimal oxidation temperatures in the active reaction zone in such a way that proper combustion and consequently operation of the fireplace can be guaranteed.
- the calculation of the oxygen coefficient using the energy balance method can not only be carried out for the secondary air supply, but is also beneficial in order to recognize the limits of the primary air actuator and the primary air (gasifying air regardless of how the fireplace is supplied or through the grate, laterally, or via the fuel)) accordingly or in good time, thereby avoiding the combustion getting into a lack of oxygen.
- Incineration calculations are taken into account or used.
- the method according to the invention can be carried out automatically.
- the control interventions can therefore take place automatically. This can be done, for example, by means of a control unit in which the above formulas are stored in appropriate software, including the correction parameters that may have to be entered.
- the temperature values from the combustion chamber area and / or the exhaust gas are then also transmitted to this control unit.
- the supply of primary air and / or secondary air can be regulated automatically by a controller.
- Subject of the present The invention is also a device with which this control of the supply of primary and / or secondary air can be carried out in a particularly favorable manner, in particular with which the advantages described above can be achieved particularly favorably.
- the device according to the invention for supplying combustion air in the combustion chamber of a single-room combustion system is characterized in that it has a chamber that has a main channel on a first side for supplying ambient air and / or air from the chimney system and a disc scavenging air channel on a second side and has a secondary air duct through which the primary and / or secondary air can be fed into the combustion chamber, both the washer scavenging air duct and the secondary air duct being provided with a flap so that the washer scavenging air duct and the secondary air duct can be closed independently of one another, the flaps with are connected to a stepless motor so that the flaps can be moved steplessly.
- the window rinsing air functions as primary (SSL-PL) and secondary air (SSL-SL) depending on the height of the viewing window of the combustion system.
- the first side of the chamber can be located opposite the second side of the chamber.
- Other configurations are also possible.
- the flaps can be designed as disks which are mounted on the air inlet of the primary duct and / or the secondary air duct.
- the flaps can both the windshield washing air via the windshield washing air duct and the Regulate the grate air via the grate air duct.
- the window rinsing air can be regulated for an opening of 0% to x% and the grate air can be regulated from 100% - x%, where x denotes the percentage opening width of the flaps and is generally 70% to 90% for an adequate design of the air supply ducts .
- the device can have at least one solar panel and / or a device for thermoelectric power generation and / or a regular power supply via the domestic socket Regulation can be provided. In this way, the required power requirement of the device can be made available without great effort
- the device can furthermore have a control or regulating unit which is adapted to automatically control or regulate the air supply.
- Air flaps with stepless motors can be used to regulate the combustion air supply.
- the flaps regulate defined opening widths via two flaps that can be designed, for example, as panes which are built at the air inlet of the air chambers or ducts that are separated from one another.
- the two flaps are installed in a box or pipe system, which draws all of the combustion air from the environment via a main duct or from the chimney system in the case of room air-independent operation.
- the negative pressure and the boiler temperature for single-room firing with water-bearing components as Safety-relevant variables can be recorded using a built-in pressure monitor or temperature sensor and integrated accordingly into the software.
- the primary air flap rotates to the zero position for technical reasons, at which the primary air opening is 100% closed.
- a mechanism for regulating the combustion air is provided. With this mechanism, when the primary air flap is retracted from a 40% level to 0% level, a mechanically locked safety air flap is simultaneously actuated mechanically, which provides a correspondingly large opening and thus a sufficient amount of combustion air is supplied to the combustion process for safe combustion.
- the regulation of the primary air flap in normal operation can be over 60% (between 40% to 100%) of the total opening width of the Primary air take place, whereby the secondary air can be regulated from 0% to 100% of the opening width.
- the regulation can be carried out with inexpensive, robust and long-lasting sensors which deliver stable signals or require no maintenance and calibration in practice. Resistant temperature sensors that require simple electronics for processing the signals can be used here.
- the automatic control which can be adjusted with the setting of parameters, enables the control to be quickly adapted to all types of combustion systems, regardless of their design, without the need to change the software.
- the software and hardware with the combustion air distribution system can be used universally and take into account all normative requirements and approval regulations of the DIBt (Deutsches Institut für Bautechnik) for technical approval and safe operation in practice.
- the hardware components with the sensors and the control actors can be selected in such a way that the control system can be operated without any heavy current or domestic power supply.
- the total power consumption is in the watt range.
- a simple solar module can supply the control system with the necessary electricity.
- the technical combination of the air distribution system with the method according to the invention enables universal use in new firing systems as well as safe retrofitting of many individual room firing systems that exist in practice. ⁇ Thanks to the intelligent control, the heat is not only produced efficiently, but also used efficiently, which means that not only resources but also significant C0 2 savings can be achieved.
- FIG. 1 shows a representation of a hand-loaded single-room firing system.
- Fig. 2 shows a plan view of the device according to the invention.
- Fig. 3 shows the paramagnetically measured and calculated with the model equation oxygen concentration in a single room combustion system.
- Fig. 4 shows oxygen, furnace temperature and carbon monoxide when operating a single-room combustion system.
- FIG. 1 shows a hand-loaded single-room combustion system 10. It has a combustion chamber area 11 in which a fuel is burned.
- window scavenging air (SSL) and / or grate air (RL) can be introduced into the combustion chamber area 11 via a window scavenging air duct 3 and secondary air (SL) can be introduced into the combustion chamber area 11 via a secondary air duct 4.
- the air flows are shown in Fig. 1 with arrows.
- Rust air can be introduced if the oxygen content of the windshield rinsing air is insufficient to set the combustion in motion with sufficient intensity to achieve favorable temperatures for carrying out the oxidation reactions, as is the case with the Burning damp and / or thick logs or coal.
- the grate air can reach the combustion chamber area 11 from below through the grate. The path of the grate air is shown in Fig.
- Both the window scavenging air duct 3 and the secondary air duct 4 can be closed independently of one another via flaps 5, whereby these flaps can be continuously adjusted by motors 6, 7 in order to ensure precise control of the air admission.
- temperature sensors T 1 , T 2 can be provided on the baffle plate, for example.
- temperature sensors can be installed in the first exhaust flue after the exhaust baffle plate.
- this is only one example of a location at which the temperature sensors T 1 , T 2 can be provided. Of course, they can also be located in other places in the combustion chamber area, such as in the exhaust flue.
- a further temperature sensor T Ab with which the temperature in the exhaust gas is measured, can be located in the exhaust gas area. Furthermore, the ambient temperature T u in the installation room can be measured and taken into account for the regulation. The measurement of the temperature of the exhaust gas provides more information, but it is not mandatory, but optional.
- the measured temperature values are transmitted to the control unit 12 (control unit / microcontroller) (see dashed lines).
- the oxygen is calculated there using the above formulas and parameters.
- the supply of primary air and / or secondary air can then be regulated by issuing appropriate commands to the motors 6, 7.
- the flows of the combustion air are as follows: SSL-SL: windshield rinsing air as secondary air; SSL-PL:
- Fig. 2 the device according to the invention is shown in plan view, with which the supply of primary and / or secondary air can be controlled in the combustion chamber area.
- the device has a chamber 1, which on a first side has a main channel 2 for the supply of air and / or air from the chimney system (combustion air) (shown as an arrow) and on a second side a disc scavenging air channel 3 (SSL: disc scavenging air) and a secondary air channel 4 (SL: secondary air, like 0 2) , whereby both the washer-scavenging air channel 3 and the secondary air channel 4 are provided with a flap 5 (only indicated schematically in FIG. 2), so that the scavenging air channel 3 and the secondary air channel 4 can be closed independently of one another are, wherein the flaps 5 are each connected to a stepless motor 6, 7, so that the flaps 5 can be moved continuously. Furthermore, a grate air duct 13 is provided, the grate air being regulated via the flap 5, which is connected to the motor 6 for the disc rinsing air duct 3.
- the device also has a solar panel 8, with which the electricity required to operate the device can be generated.
- FIG. 3 the oxygen concentrations calculated according to the model equation and measured with a paramagnetic oxygen analysis are shown during the combustion of beech logs in a prototype of a single-room combustion system from the Hase company.
- the concentrations of oxygen in the exhaust gas calculated and measured on the basis of the model equation correlate and the model equation is therefore very well suited for determining the oxygen content in the exhaust gas.
- the control concept based on the energy balance method of the Fraunhofer Institute for Building Physics IBP was implemented on the basis of a PLC control (programmable logic controller).
- the pollutant emissions such.
- the efficiency was increased by approx. 16% based on practical operation. A further improvement can be achieved through further development of the software.
- the targeted regulation of the secondary air takes place by means of an oxygen coefficient calculated using the energy balance method
- the primary air actuator can also be operated within its favorable limits, which can prevent the combustion from falling into oxygen deficiency. This means when the secondary air actuator reaches its maximum limit (flap 5 of the stepper motor 6 (or secondary air actuator) 90% open; here 10% as a reserve) and the calculated oxygen coefficient is still below the oxygen setpoint stored in the program the primary air (RL-PL + SSL-PL) is reduced in good time to avoid a lack of oxygen and thus incomplete combustion avoid.
- a servomotor can also be used as an alternative to the stepper motor 6, a servomotor can also be used.
- the targeted regulation of the primary air takes place for the setting of a favorable temperature in the active reaction zone (combustion chamber + post-oxidation chamber) for an effective implementation of the oxidation reactions or a complete combustion.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Incineration Of Waste (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
Description
Claims
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DE102019217537.6A DE102019217537A1 (de) | 2019-11-13 | 2019-11-13 | Verfahren und Vorrichtung zur Regelung der Verbrennung in Feuerungsanlagen |
PCT/EP2020/081593 WO2021094291A1 (de) | 2019-11-13 | 2020-11-10 | Verfahren und vorrichtung zur regelung der verbrennung in feuerungsanlagen |
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EP4058727A1 true EP4058727A1 (de) | 2022-09-21 |
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EP20804255.6A Pending EP4058727A1 (de) | 2019-11-13 | 2020-11-10 | Verfahren und vorrichtung zur regelung der verbrennung in feuerungsanlagen |
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US (1) | US20220404017A1 (de) |
EP (1) | EP4058727A1 (de) |
KR (1) | KR20220092978A (de) |
CA (1) | CA3158466A1 (de) |
DE (1) | DE102019217537A1 (de) |
WO (1) | WO2021094291A1 (de) |
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DE102021106951A1 (de) | 2021-03-22 | 2022-09-22 | Vaillant Gmbh | Verfahren und Anordnung zur Beobachtung von Flammen in einem Heizgerät, das mit Wasserstoff oder wasserstoffhaltigem Brenngas betreibbar ist |
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DE4316182A1 (de) * | 1993-05-14 | 1994-11-17 | Haiko Kuenzel | Verfahren zum Steuern und/oder Regeln einer mit einem Feststoffkessel ausgerüsteten Heizungsanlage sowie Vorrichtung zur Durchführung des Verfahrens |
AT413004B (de) * | 2000-11-23 | 2005-09-26 | Vaillant Gmbh | Verfahren zur steuerung eines von einem gebläseunterstützten brenner beheizten kessels |
US20070100502A1 (en) * | 2005-10-27 | 2007-05-03 | Rennie John D Jr | Systems and methods to control a multiple-fuel steam production system |
EP1785786A1 (de) * | 2005-11-09 | 2007-05-16 | Lentjes GmbH | Ofenfeuerungsleistungsregelung |
EP2085694B1 (de) * | 2008-01-30 | 2018-05-30 | IHS Innovation APS | Elektronisch gesteuerter Holzbrennofen und Regelungsverfahren dafür |
DE102009005178B4 (de) * | 2009-01-15 | 2012-01-19 | Spartherm Feuerungstechnik Gmbh | Vorrichtung zum Verbrennen von festen Brennstoffen |
DE102011108557A1 (de) * | 2011-07-26 | 2013-01-31 | Sht Heiztechnik Aus Salzburg Gmbh | Zuluftsteurung für eine heizeinrichtung |
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2019
- 2019-11-13 DE DE102019217537.6A patent/DE102019217537A1/de active Pending
-
2020
- 2020-11-10 KR KR1020227019146A patent/KR20220092978A/ko unknown
- 2020-11-10 EP EP20804255.6A patent/EP4058727A1/de active Pending
- 2020-11-10 CA CA3158466A patent/CA3158466A1/en active Pending
- 2020-11-10 WO PCT/EP2020/081593 patent/WO2021094291A1/de unknown
- 2020-11-10 US US17/776,494 patent/US20220404017A1/en active Pending
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WO2021094291A1 (de) | 2021-05-20 |
US20220404017A1 (en) | 2022-12-22 |
DE102019217537A1 (de) | 2021-05-20 |
KR20220092978A (ko) | 2022-07-04 |
CA3158466A1 (en) | 2021-05-20 |
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