FR2859028A1 - Regeneration process for cleaning solvent includes distillation, and temperature controlled complete combustion of effluent gases - Google Patents

Regeneration process for cleaning solvent includes distillation, and temperature controlled complete combustion of effluent gases Download PDF

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Publication number
FR2859028A1
FR2859028A1 FR0400519A FR0400519A FR2859028A1 FR 2859028 A1 FR2859028 A1 FR 2859028A1 FR 0400519 A FR0400519 A FR 0400519A FR 0400519 A FR0400519 A FR 0400519A FR 2859028 A1 FR2859028 A1 FR 2859028A1
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Prior art keywords
temperature
combustion
effluents
function
flow rate
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Application number
FR0400519A
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French (fr)
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FR2859028B1 (en
Inventor
Robert Chen
Jean Pierre Jeammet
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Process Systems Inc
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Process Systems Inc
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Priority claimed from FR0310148A external-priority patent/FR2859027A1/en
Application filed by Process Systems Inc filed Critical Process Systems Inc
Priority to FR0400519A priority Critical patent/FR2859028B1/en
Publication of FR2859028A1 publication Critical patent/FR2859028A1/en
Application granted granted Critical
Publication of FR2859028B1 publication Critical patent/FR2859028B1/en
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Expired - Fee Related 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
    • 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
    • F23N5/022—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using electronic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1425—Regeneration of liquid absorbents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/50—Control or safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
    • F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
    • 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
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2207/00—Control
    • F23G2207/10—Arrangement of sensing devices
    • F23G2207/101—Arrangement of sensing devices for temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2207/00—Control
    • F23G2207/10—Arrangement of sensing devices
    • F23G2207/112—Arrangement of sensing devices for waste supply flowrate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2900/00—Special features of, or arrangements for incinerators
    • F23G2900/55—Controlling; Monitoring or measuring
    • F23G2900/55011—Detecting the properties of waste to be incinerated, e.g. heating value, density
    • 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
    • F23N2241/00—Applications
    • F23N2241/18—Incinerating apparatus

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

Solvent, previously used for cleaning, is regenerated by distillation. The effluent gases are incinerated to avoid pollution. The system provides control of the temperature (TT2) of the combustion chamber as a function of calorific value and the flow rate (FT1) of the gases, in order to achieve complete combustion. The system provides control of the combustion of the effluent products in a gas processing system for regeneration of liquid solvents. The solvent, which is rich in absorbed components is generally regenerated by distillation. The effluents are incinerated, and to achieve stoichiometric combustion the quantity of air supplied is calculated according to the flow of the combustible components. The system provides control of the temperature (TT2) of the combustion chamber as a function of the variation in measured values for calorific value and the flow rate (FT1) of the gases. The variation in calorific value is a function of the temperature (TT1) at the top of the distillation column, and the mode of operation of the regenerator. This temperature (TT1) is measured in order control combustion temperature.

Description

- 1 -- 1 -

La présente invention concerne le procédé de la régulation de la combustion des effluents gazeux issus d'un système de régénération dans le domaine de traitement des gaz. Dans un système de régénération d'un solvant liquide provenant d'une tour de lavage (triéthylèneglycol, MDEA, DEA, MEA, etc...), le liquide riche en composant absorbé est en général régénéré par distillation en produisant en tête de colonne des effluents. Ces effluents se composent d'une vapeur non combustible et d'éléments combustibles gazeux.  The present invention relates to the method of controlling the combustion of gaseous effluents from a regeneration system in the field of gas treatment. In a system for regenerating a liquid solvent from a washing tower (triethylene glycol, MDEA, DEA, MEA, etc.), the absorbed component-rich liquid is generally regenerated by distillation, producing at the top of the column effluents. These effluents consist of a non-combustible vapor and gaseous fuel elements.

Dans certains procédés industriels, ces effluents sont incinérés. Pour réaliser une combustion stoechiométrique, il faut fournir la quantité d'air nécessaire. Cette quantité d'air est calculée à partir du débit de composants combustibles contenus dans le mélange sous forme hydrocarbure ou autres (voir figure 2).  In some industrial processes, these effluents are incinerated. To achieve stoichiometric combustion, it is necessary to provide the necessary amount of air. This amount of air is calculated from the flow of fuel components contained in the mixture in hydrocarbon form or other (see Figure 2).

Dans l'exploitation industrielle, la composition du mélange d'effluents varie en fonction de la qualité de gaz à traiter dans la tour de lavage et du mode de fonctionnement de la régénération (par exemple. humidité du gaz à laver, utilisation ou pas du gaz de stripage, injection dans le gaz à laver de déshydratants tels que le méthanol, etc...), le pouvoir calorifique inférieur d'effluents est donc très varié (PCI instable). Dans les installations existantes, la régulation est faite sans tenir compte cette variation du PCI.  In the industrial operation, the composition of the effluent mixture varies according to the quality of the gas to be treated in the washing tower and the mode of operation of the regeneration (eg humidity of the gas to be washed, use or not of the stripping gas, injection into the washing gas desiccants such as methanol, etc ...), the lower heating value of effluents is very varied (PCI unstable). In existing installations, regulation is done without taking into account this variation of the PCI.

Afin de contrôler la combustion, il est nécessaire de connaître la concentration instantanée du gaz de combustion dans le mélange. Cette concentration peut être déterminée à partir des paramètres opératoires, la pression et la température des effluents en tête de colonne de distillation ainsi que le mode de fonctionnement (stripage, injection de déshydratants).  In order to control the combustion, it is necessary to know the instantaneous concentration of the combustion gas in the mixture. This concentration can be determined from the operating parameters, the pressure and the temperature of the effluents at the top of the distillation column as well as the mode of operation (stripping, injection of desiccants).

En fonction de la quantité du composant à absorber par le solvant liquide de lavage, les effluents en tête de la colonne de distillation seront plus ou moins riche en composant combustible, la température d'équilibre (TT1) est une fonction de la composition des effluents qui détermine le pouvoir calorifique inférieur du mélange. Le diagramme en figure (1) montre la relation entre le pouvoir calorifique inférieur (PCI) des effluents et la température pour une - 2 pression de condensation donnée. Le débit du solvant liquide de lavage étant constant, la quantité de matières absorbés donc le débit massique des effluents est une fonction de la température d'équilibre (TT1). Comme le PcI et le débit sont tous en fonction de la température d'équilibre des effluents, on peut déduire que la puissance thermique de la combustion des effluents est une fonction de la température d'équilibre des effluents en sortie de la colonne de distillation (TT1).  Depending on the amount of the component to be absorbed by the washing liquid solvent, the effluents at the top of the distillation column will be more or less rich in fuel component, the equilibrium temperature (TT1) is a function of the composition of the effluents which determines the lower heating value of the mixture. The diagram in FIG. (1) shows the relationship between the lower heating value (HPC) of the effluents and the temperature for a given condensation pressure. Since the flow rate of the washing liquid solvent is constant, the quantity of absorbed material and therefore the mass flow rate of the effluents is a function of the equilibrium temperature (TT1). As the PcI and the flow rate are all in function of the equilibrium temperature of the effluents, it can be deduced that the thermal power of the combustion of the effluents is a function of the equilibrium temperature of the effluents leaving the distillation column ( TT1).

selon le mode de fonctionnement, on peut définir préalablement une ou plusieurs courbes correspondantes.  depending on the operating mode, one or more corresponding curves can be defined beforehand.

É FT1 = f2 (TT1) É P = f3 (TTl) Le schéma en figure (2) décrit le principe de régulation de combustion. Le régulateur prend en compte des paramètres (pression, température et débit) des effluents, calcule les débits d'air de combustion et de dilution en utilisant ces courbes prédéfinies.  E FT1 = f2 (TT1) É P = f3 (TTl) The diagram in figure (2) describes the principle of combustion regulation. The controller takes into account parameters (pressure, temperature and flow) of the effluents, calculates the combustion and dilution air flows using these predefined curves.

La particularité de la présente invention consiste en la régulation de la combustion de ces effluents selon leur température en sortie de la colonne de distillation, cette température étant non seulement un indicateur important de concentration en composants combustibles, mais aussi un indicateur du débit des effluents.  The particularity of the present invention consists in regulating the combustion of these effluents according to their temperature at the outlet of the distillation column, this temperature being not only an important indicator of concentration of combustible components, but also an indicator of the flow of the effluents.

Cette méthode de régulation permet de contrôler la température de la chambre de combustion lorsque le débit et la composition (d'où le PCI) peuvent varier et en particulier durant les phases transitoires ou d'injection de déshydratants.  This control method makes it possible to control the temperature of the combustion chamber when the flow rate and the composition (hence the ICP) can vary and in particular during the transient or desiccant injection phases.

Claims (4)

REVENDICATIONS 1) Procédé de contrôle de la température (TT2) de chambre de combustion en fonction de la variation du PCI et du débit (FT1) des effluents gazeux provenant d'un système de régénération d'un liquide de lavage (voir figure2). La mesure du PCI et du débit des effluent (FT1) permet au régulateur R2 de contrôler la température de chambre de combustion (TT2).  1) Method of controlling the temperature (TT2) of the combustion chamber as a function of the variation of the PCI and the flow rate (FT1) of the gaseous effluents from a regeneration system of a washing liquid (see FIG. 2). The measurement of the PCI and the effluent flow rate (FT1) allows the regulator R2 to control the combustion chamber temperature (TT2). 2) Procédé de contrôle selon la revendication 1 caractérisé en ce que la variation du PCI des effluents est une fonction de la température (TT1) en sortie de la colonne de distillation et du mode de fonctionnement du régénérateur (voir figure 1). La mesure de cette température (TT1) permet au régulateur R2 de calculer le PCI des effluents et de contrôler la température de chambre de combustion (TT2).  2) Control method according to claim 1 characterized in that the variation of the PCI effluent is a function of the temperature (TT1) at the outlet of the distillation column and the operating mode of the regenerator (see Figure 1). The measurement of this temperature (TT1) allows the regulator R2 to calculate the PCI of the effluents and to control the combustion chamber temperature (TT2). 3) Procédé de contrôle selon la revendication 1 ou la revendication 2 caractérisé en ce que le débit des effluents (FT1) provenant de la colonne de distillation est une fonction de la température (TT1) en sortie de la colonne de distillation et du mode de fonctionnement du régénérateur. La mesure de cette température permet au régulateur R2 de connaître le débit des effluents (FT1) et de contrôler la température de chambre de combustion (TT2).  3) Control method according to claim 1 or claim 2 characterized in that the effluent flow (FT1) from the distillation column is a function of the temperature (TT1) at the outlet of the distillation column and the mode of distillation. regenerator operation. The measurement of this temperature enables regulator R2 to know the effluent flow rate (FT1) and to control the combustion chamber temperature (TT2). 4) Procédé de contrôle selon la revendication 1 ou la revendication 2 ou la revendication 3 caractérisé en ce la puissance thermique de la combustion des effluents est une fonction de la température (TT1) en sortie de la colonne de distillation et du mode de fonctionnement du régénérateur. La connaissance de cette température (TT1) permet au régulateur R2 de calculer le débit et le PCI des effluents donc la puissance thermique de la combustion de ces effluents, et de contrôler la température de chambre de combustion (TT2).  4) A method of control according to claim 1 or claim 2 or claim 3 characterized in that the thermal power of the effluent combustion is a function of the temperature (TT1) at the outlet of the distillation column and the operating mode of the regenerator. The knowledge of this temperature (TT1) allows the regulator R2 to calculate the flow rate and the PCI of the effluents thus the thermal power of the combustion of these effluents, and to control the combustion chamber temperature (TT2).
FR0400519A 2003-08-20 2004-01-19 METHOD OF CONTROLLING THE COMBUSTION OF A MIXTURE OF EFFLUENTS FROM A REGENERATION SYSTEM Expired - Fee Related FR2859028B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0400519A FR2859028B1 (en) 2003-08-20 2004-01-19 METHOD OF CONTROLLING THE COMBUSTION OF A MIXTURE OF EFFLUENTS FROM A REGENERATION SYSTEM

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0310148A FR2859027A1 (en) 2003-08-20 2003-08-20 Regeneration process for cleaning solvent includes distillation, and controlled combustion of gaseous products to avoid pollution
FR0400519A FR2859028B1 (en) 2003-08-20 2004-01-19 METHOD OF CONTROLLING THE COMBUSTION OF A MIXTURE OF EFFLUENTS FROM A REGENERATION SYSTEM

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FR2859028A1 true FR2859028A1 (en) 2005-02-25
FR2859028B1 FR2859028B1 (en) 2007-05-25

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4115862A (en) * 1977-06-20 1978-09-19 Phillips Petroleum Company Process control method and apparatus
GB1579178A (en) * 1976-04-09 1980-11-12 Continental Carbon Co Method and apparatus for the combustion of waste gases
EP0303896A1 (en) * 1987-08-06 1989-02-22 Incinatrol Inc. Incinerator combustion fuel control

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1579178A (en) * 1976-04-09 1980-11-12 Continental Carbon Co Method and apparatus for the combustion of waste gases
US4115862A (en) * 1977-06-20 1978-09-19 Phillips Petroleum Company Process control method and apparatus
EP0303896A1 (en) * 1987-08-06 1989-02-22 Incinatrol Inc. Incinerator combustion fuel control

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