GB2190515A - Regenerator control by flue recirculation - Google Patents

Regenerator control by flue recirculation Download PDF

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Publication number
GB2190515A
GB2190515A GB08609080A GB8609080A GB2190515A GB 2190515 A GB2190515 A GB 2190515A GB 08609080 A GB08609080 A GB 08609080A GB 8609080 A GB8609080 A GB 8609080A GB 2190515 A GB2190515 A GB 2190515A
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GB
United Kingdom
Prior art keywords
flue
flow
temperature
heating
fuel
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
Application number
GB08609080A
Other versions
GB2190515B (en
GB8609080D0 (en
Inventor
Julian Branford Todd
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB8609080A priority Critical patent/GB2190515B/en
Publication of GB8609080D0 publication Critical patent/GB8609080D0/en
Publication of GB2190515A publication Critical patent/GB2190515A/en
Application granted granted Critical
Publication of GB2190515B publication Critical patent/GB2190515B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2221/00—Pretreatment or prehandling
    • F23N2221/12—Recycling exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F23N2225/06—Measuring pressure for determining flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • 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
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/21—Measuring temperature outlet temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/02—Ventilators in stacks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • 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
    • F23N2235/04—Air or combustion gas valves or dampers in stacks
    • 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
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated
    • 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

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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)

Abstract

The high fuel economy inherent in heating systems incorporating static-bed thermal regeneration can be made available to processes requiring precise temperature control by coupling the air supply 7 and the flue extract 9 together in a circuit 24 external to the regenerator system. A control unit 21 monitors the mass flow rate through valves 3, 11, 16, 19 and the fuel valve 20, and alters their settings periodically so as to maintain a substantially constant fluid mass flow in the circuit 24. The thermal output of the regenerator system may therefore be modulated without risking disruption of the heat store temperature profiles and the consequent unpredictable heating behaviour. The internal temperature of the enclosure is monitored by a temperature transducer 25, enabling the control unit 21 to be programmed to produce any temperature/time profile required by the process. <IMAGE>

Description

SPECIFICATION Regenerator control by flue recirculation This invention relates to the control of a fuel burner for heating an enclosure.
Static bed regenerators ofvarying size have been fitted to industrial high temperature heating enclosures for many years in order to improve the efficiency of the process, orto utilise fuel of low calorific value. However, the potential fuel economy inherent in heating systems incorporating static-bed regenerative heat exchangers has hitherto been unavailable to processes which require precise temperature control, because the heat output of the regenerator system cannot be modulated without risking severe disruption ofthetemperature profiles of the heat-stores. Adverse interaction between the unsteady-state process and the unsteady-state regenerative system can result in unpredictable heating behaviour and physical damagetothe process stock and/orthe heating system.
According to the present invention the air supply to the regenerator system and the flue flow from it are coupled together in a circuit external to the regenerator system, such that a metered proportion ofthe flue flow can be fed back into the airflow, such that the mass flow rate of gases through the heat stores can be maintained substantially constant even though the airflow, and fuel flow in suitable proportion, are modulated in accordance with the heat demand of the process.
Aspecificembodimentofthe invention will now be described by way of example with reference to the accompanying drawing, Figure 1, which shows a schematic of the fluid flow circuit external to the regenerator system.
Figure 7 shows a combustion air inlet 1 to a pipe 2 containing an airflow rate control valve 3 preceeding a junction 4 and a fan or compressor5, which forces gases into the regenerator system 6 via the inlet pipe 7. Flue gases from the enclosures are sucked back through the regeneratorsystem and viathe exhaust pipe 9 into a pipe 10 containing a flow rate control valve 11 adjusted automatically to maintain a set pressure in the enclosure 8 and connected to the inlet of a hot-gas fan or compressor 12. The control input for the valve 11 is derived from a differential pressure transducer 13.The outlet of the fan 12 is divided at a junction 14, one pipe 15 leading via a flow control valve 16to a flue or stack 17, and the other pipe 18 leading via a flow control valve 19to the junction 4. The valves 3, 11,16, 6,1 9 and thefuel control valve 20, are controlled by a programmable control unit21 which monitors the mass flow rate through the valves via differential pressure transducers 22 and temperature transducers 23, and alters the valve settings periodically so as to maintain asubstantiallyconstantfluid massflowin the circuit 24.The internal temperature of the enclosure is monitored by a temperature transducer 25, such thatthe control unit 21 may be programmed to produce anytemperature profile required by the process.
1. Afuel-fired regenerative heating system in which the air supply to the regenerator system and the flue flow from it are coupled together in a circuit external to the heat stores such that a metered proportion of the flue flow can be fed back into the air flow, such that the mass flow rate of gases through the heat stores can be maintained substantially constant even though the airflow, and fuel flow in suitable proportion, are modulated in accordance with the heat demand of the process.
2. Asystem according to claim 1 wherein the metering and modulationofair,fuel andflueflowsis controlled by an automatic machine.
3. A system according to ciaims 1 and 2 wherein the automatic machine is an electronic computer connected to suitable transducers and effectors.
4. A system according to any preceeding claim wherein the computer is programmable to produce any variation of process temperature with time required by the heating process by initiating appropriate variations in air, fuel andflueflows into the regenerative system.
5. A system according to any preceeding claim wherein the controlling computer is a digital device.
6. A system according to claim 5 wherein the computer program embodies a predictive model of the thermal behaviourofthe heat stores.
7. A system according to any preceeding claim wherein the controller is adaptive.
8. A regenerative heating system as hereinbefore described.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Regenerator control by flue recirculation This invention relates to the control of a fuel burner for heating an enclosure. Static bed regenerators ofvarying size have been fitted to industrial high temperature heating enclosures for many years in order to improve the efficiency of the process, orto utilise fuel of low calorific value. However, the potential fuel economy inherent in heating systems incorporating static-bed regenerative heat exchangers has hitherto been unavailable to processes which require precise temperature control, because the heat output of the regenerator system cannot be modulated without risking severe disruption ofthetemperature profiles of the heat-stores. Adverse interaction between the unsteady-state process and the unsteady-state regenerative system can result in unpredictable heating behaviour and physical damagetothe process stock and/orthe heating system. According to the present invention the air supply to the regenerator system and the flue flow from it are coupled together in a circuit external to the regenerator system, such that a metered proportion ofthe flue flow can be fed back into the airflow, such that the mass flow rate of gases through the heat stores can be maintained substantially constant even though the airflow, and fuel flow in suitable proportion, are modulated in accordance with the heat demand of the process. Aspecificembodimentofthe invention will now be described by way of example with reference to the accompanying drawing, Figure 1, which shows a schematic of the fluid flow circuit external to the regenerator system. Figure 7 shows a combustion air inlet 1 to a pipe 2 containing an airflow rate control valve 3 preceeding a junction 4 and a fan or compressor5, which forces gases into the regenerator system 6 via the inlet pipe 7. Flue gases from the enclosures are sucked back through the regeneratorsystem and viathe exhaust pipe 9 into a pipe 10 containing a flow rate control valve 11 adjusted automatically to maintain a set pressure in the enclosure 8 and connected to the inlet of a hot-gas fan or compressor 12. The control input for the valve 11 is derived from a differential pressure transducer 13.The outlet of the fan 12 is divided at a junction 14, one pipe 15 leading via a flow control valve 16to a flue or stack 17, and the other pipe 18 leading via a flow control valve 19to the junction 4. The valves 3, 11,16, 6,1 9 and thefuel control valve 20, are controlled by a programmable control unit21 which monitors the mass flow rate through the valves via differential pressure transducers 22 and temperature transducers 23, and alters the valve settings periodically so as to maintain asubstantiallyconstantfluid massflowin the circuit 24.The internal temperature of the enclosure is monitored by a temperature transducer 25, such thatthe control unit 21 may be programmed to produce anytemperature profile required by the process. CLAIMS
1. Afuel-fired regenerative heating system in which the air supply to the regenerator system and the flue flow from it are coupled together in a circuit external to the heat stores such that a metered proportion of the flue flow can be fed back into the air flow, such that the mass flow rate of gases through the heat stores can be maintained substantially constant even though the airflow, and fuel flow in suitable proportion, are modulated in accordance with the heat demand of the process.
2. Asystem according to claim 1 wherein the metering and modulationofair,fuel andflueflowsis controlled by an automatic machine.
3. A system according to ciaims 1 and 2 wherein the automatic machine is an electronic computer connected to suitable transducers and effectors.
4. A system according to any preceeding claim wherein the computer is programmable to produce any variation of process temperature with time required by the heating process by initiating appropriate variations in air, fuel andflueflows into the regenerative system.
5. A system according to any preceeding claim wherein the controlling computer is a digital device.
6. A system according to claim 5 wherein the computer program embodies a predictive model of the thermal behaviourofthe heat stores.
7. A system according to any preceeding claim wherein the controller is adaptive.
8. A regenerative heating system as hereinbefore described.
GB8609080A 1986-04-15 1986-04-15 Regenerator control by flue recirculation Expired - Lifetime GB2190515B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8609080A GB2190515B (en) 1986-04-15 1986-04-15 Regenerator control by flue recirculation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8609080A GB2190515B (en) 1986-04-15 1986-04-15 Regenerator control by flue recirculation

Publications (3)

Publication Number Publication Date
GB8609080D0 GB8609080D0 (en) 1986-05-21
GB2190515A true GB2190515A (en) 1987-11-18
GB2190515B GB2190515B (en) 1990-07-25

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Family Applications (1)

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GB8609080A Expired - Lifetime GB2190515B (en) 1986-04-15 1986-04-15 Regenerator control by flue recirculation

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342347A2 (en) * 1988-04-16 1989-11-23 Conel Ag Method for reducing the effect of deregulating factors for ventilator burners and ventilator burners
EP0396164A2 (en) * 1989-05-04 1990-11-07 Bloom Engineering Company, Inc., Method and device for controlling NOx emissions by vitiation
US5244147A (en) * 1992-03-26 1993-09-14 Ebara Corporation Furnace pressure control method
WO1996031737A1 (en) * 1995-04-05 1996-10-10 Societe De Chauffe, De Combustibles, De Reparations Et D'appareillages Mecaniques, Soccram Deposited-bed boiler and method for operating same with reduced nitrogen oxide emissions

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342347A2 (en) * 1988-04-16 1989-11-23 Conel Ag Method for reducing the effect of deregulating factors for ventilator burners and ventilator burners
EP0342347A3 (en) * 1988-04-16 1990-04-04 Programmelectronic Engineering Ag Method for reducing the effect of deregulating factors for ventilator burners and ventilator burners
US5106294A (en) * 1988-04-16 1992-04-21 Conel Ag Method and arrangement for reducing the effect of disturbances on the combustion of a fan burner system
EP0396164A2 (en) * 1989-05-04 1990-11-07 Bloom Engineering Company, Inc., Method and device for controlling NOx emissions by vitiation
EP0396164A3 (en) * 1989-05-04 1991-06-05 Bloom Engineering Company, Inc., Method and device for controlling nox emissions by vitiation
US5244147A (en) * 1992-03-26 1993-09-14 Ebara Corporation Furnace pressure control method
EP0562144A1 (en) * 1992-03-26 1993-09-29 Ebara Corporation Furnace pressure control method
WO1996031737A1 (en) * 1995-04-05 1996-10-10 Societe De Chauffe, De Combustibles, De Reparations Et D'appareillages Mecaniques, Soccram Deposited-bed boiler and method for operating same with reduced nitrogen oxide emissions
FR2732756A1 (en) * 1995-04-05 1996-10-11 Soccram LAYERED BOILER AND BOILER DRIVING METHOD WITH REDUCTION OF NITROGEN OXIDE EMISSIONS

Also Published As

Publication number Publication date
GB2190515B (en) 1990-07-25
GB8609080D0 (en) 1986-05-21

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PCNP Patent ceased through non-payment of renewal fee