EP3612292A1 - Procédé permettant de faire fonctionner un réacteur de dénitruration de gaz de combustion dénitrurant de manière catalytique un gaz de combustion et système de dénitruration de gaz de combustion comprenant un réacteur de dénitruration de gaz de combustion approprié pour la mise en uvre du procédé - Google Patents

Procédé permettant de faire fonctionner un réacteur de dénitruration de gaz de combustion dénitrurant de manière catalytique un gaz de combustion et système de dénitruration de gaz de combustion comprenant un réacteur de dénitruration de gaz de combustion approprié pour la mise en uvre du procédé

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Publication number
EP3612292A1
EP3612292A1 EP18720559.6A EP18720559A EP3612292A1 EP 3612292 A1 EP3612292 A1 EP 3612292A1 EP 18720559 A EP18720559 A EP 18720559A EP 3612292 A1 EP3612292 A1 EP 3612292A1
Authority
EP
European Patent Office
Prior art keywords
flue gas
mass flow
reducing agent
section
flow
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.)
Withdrawn
Application number
EP18720559.6A
Other languages
German (de)
English (en)
Inventor
Justus KRIEB
Reiner HUPFELD
Bernd Vollmer
Ulrich Kersken
Georg Papenheim
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.)
Mitsubishi Power Europe GmbH
Original Assignee
Mitsubishi Hitachi Power Systems Europe GmbH
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 Mitsubishi Hitachi Power Systems Europe GmbH filed Critical Mitsubishi Hitachi Power Systems Europe GmbH
Publication of EP3612292A1 publication Critical patent/EP3612292A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • 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
    • B01D53/30—Controlling by gas-analysis apparatus
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8696—Controlling the catalytic process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

Definitions

  • the invention is directed to a method of operating a flue gas catalytically entstickenden flue gas denitrification reactor, which is arranged in the flue gas duct of a carbon-fuel-fired steam generator of a power plant, with respect to the flue gas flow upstream of at least one a catalyst layer comprehensive, traversed by the flue gas catalyst region of the
  • Rauchgasentstickungsreaktors a to achieve a desired initial ⁇ -content in the flowing out of the flue gas denitrification reactor clean gas flue gas mass flow reductant mass flow divided into partial streams several reductant injection zones fed with each associated reductant injection and in each Reduktionsstoff- Eindüsungszone each a Reduktionsffenteilmassenstrom into an incoming Rohgas- Flue gas mass flow is injected, wherein each reducing agent Eindüsungszone each covers a partial area of a first flow cross section of the inflowing raw gas flue gas mass flow first Rauchgaskanal- or Rauchgasentstickungsreaktorabitess and form the plurality of reducing agent Eindüsungszonen in their entirety a first flow cross section of the first flue gas duct or Rauchgasentstickungsreaktorabroughs overlapping first level ,
  • the invention is directed to a flue gas denitrification plant, in particular for carrying out the above method, comprising a flue gas catalytically entstickenden flue gas denitrification reactor, which can be arranged in a flowing through the flue gas to be denitrified flue gas channel of a carbon-fuel-fired steam generator of a power plant and comprising at least one catalyst layer, has a catalyst region which can be flowed through by a raw gas flue gas stream flowing to the flue gas denitrification reactor, with respect to the flue gas flow upstream of the catalyst region in FIG a first flow cross-section of a first flue gas channel or flue gas denitrification reactor section, through which the inflowing raw gas flue gas mass flow can flow, a plurality of reductant
  • Injection zones are each formed and arranged with at least one associated reducing agent injection, which in each case via a fluid-conducting line connection with a the inflow of a
  • Reducing agent part mass flow regulating regulating valve are in each case, wherein by means of each of the reducing agent injection zones in each case a Reduktionsffenteilmassenstrom one to achieve a desired starting NOx content in the flowing out of the Rauchgasentstickungsreaktor clean gas flue gas mass flow total required
  • Reducing agent mass flow in the first flow cross section of the first flue gas or flue gas denitrification reactor section is inflatable, wherein each reducing agent Eindüsungszone each covers a partial surface of the first flow cross section of the first flue gas or Rauchgasentstickungsreaktorabitess and the plurality of reducing agent Eindüsungszonen in their entirety form a first flow cross-section covering first level , and wherein the control valves are signal-conducting connected to a control device.
  • reducing agent ammonia
  • NH 3 slip occurs. This means that in the flue gas denitrification system or the flue gas denitrification reactor leaving flue gas / exhaust unused reducing agent concentrations, usually ammonia (NH 3 ) are detected, which should be avoided.
  • the invention is therefore based on the object to provide a solution which makes it possible to reliably de-stiffen the flue gas flow of a steam generator of a power plant even when operating in low load ranges.
  • this object is achieved in that during operation of the flue gas denitrification reactor downstream of the catalyst area in a second level in NO x -Analysezonen each with at least one associated
  • a respective first output NO x content is measured as an analysis-related first output NO x -measured value of the outflowing pure gas flue gas mass flow
  • the analyzer zone based obtained first starting NO x - Measured values are assigned to one or more reductant injection zone (s) in a matrix-like manner and in each case at least one value representative of the desired starting NO x content in the outflowing pure gas flue gas mass flow and thus the distribution of the reducing agent mass flow to the individual reducing agent partial mass flows It is thereby automatically adjusted and / or readjusted so that each of the reducing agent partial mass flows to be fed to a reducing agent injection is adjusted to the actual required value in the clean gas flue gas mass flow, in particular in the respective matrix-like NO x analysis zone in order to achieve the desired starting ⁇ content and regulated, wherein each NO x -Analysezone each a
  • the above object is achieved in a flue gas denitrification of the type described above, characterized in that downstream of the catalyst region in a second plane permanently and preferably stationary multiple NO x -Analysezonen each with at least one associated NO x - exhaust and / or NO x -Analysevoriques in a second flue gas channel or flue gas denitrification reactor section discharging a clean gas flue gas mass flow are formed and arranged, wherein a first starting NO x is permanently online by means of the NO x exhaust and / or NO x analysis device during operation of the flue gas denitrification reactor.
  • each NO x -Analysezone each have a partial area of the second flow cross-section of the abst Roman clean gas flue gas mass flow through the second Rauchgaskanal- or Rauchgasentstickungsreaktorabitess covered and the NO x analysis zones in their entirety form the second plane covering the second flow cross section of the second flue gas or flue gas denitrification reactor section.
  • NO x analysis zones permanently and firmly on the output side or in relation to the flue gas flow direction downstream of the catalyst region of the flue gas denitration reactor installed and to connect them in a controller comprising a control circuit with the reducing agent injection zones and during operation of the flue gas denitrification reactor online detected NO x values for the automatic controlled injection of reducing agent, in particular ammonia, to use the desired NO x -
  • setpoint values can be achieved well even with a steam generator operated in low load ranges and the reduction agent or ammonia slip can be avoided.
  • the NO x values are detected zone by zone by means of a so-called NO x measuring grid which has a plurality of zones and is permanently and stationarily arranged on the output side of the catalyst region of the flue gas denitrification reactor.
  • NO x measuring grid which has a plurality of zones and is permanently and stationarily arranged on the output side of the catalyst region of the flue gas denitrification reactor.
  • Reductant injections formed The number of zones and thus the geometric design of the measuring grid and the injection grid do not have to match.
  • the individual reducing agent injections have assigned to them automatically adjustable control valves, which are integrated in the control and / or regulating circuit with the regulating device.
  • the reducing agent partial mass flow fed to each reducing agent injection during operation of the flue gas denitrification reactor has a permanent injection zone zone for setting a NO x analysis zone (s) and / or the clean gas
  • Flue gas mass flow to be reached NO x setpoint currently required value is readjusted. It is expedient and advantageous, according to a further embodiment of the invention, during the operation of the flue gas denitrification reactor, that the downstream clean gas flue gas mass flow downstream of the catalyst region is permanently measured online and used to determine the actual clean gas output in the flue gas denitration reactor to achieve the desired starting NO x content. Flue gas mass flow required
  • Reducing agent mass flow is used.
  • the inflowing raw gas flue gas mass flow upstream and / or the outflowing clean gas flue gas mass flow downstream of the catalyst region and at an input NO x measuring point of the incoming NO x content of the inflowing crude gas Flue gas mass flow upstream of the first level formed by the reducing agent Eindüsungszonen be measured permanently online and from the input NO x content and the raw gas flue gas mass flow and / or the clean gas flue gas mass flow currently to achieve the desired output NOx content from the Rauchgasentstickungsreaktor flowing clean gas flue gas mass flow required reductant mass flow is calculated.
  • the desired starting NO x content of the outflowing clean gas flue gas mass flow is measured continuously online downstream of the plane formed by the NO x analysis zones becomes.
  • the regulation of the injection of the reduction medium part mass flows is advantageously carried out in that the determined measured values of the first output NOx contents are fed analytically to a control device integrated into the control loop and assigned to one or more reducing agent injection zones in a matrix-like manner in the control device, wherein the control device of matrix-like assignment of the measured values of the first output NOx contents to the reducing agent injection zones corresponding control signals to each of the inflow of reducing agent part mass flow to a reducing agent injection regulating, automatically adjustable control valves output and the reducing agent injections zone by zone to set a in the or each associated NO x -Analysezone (s) and / or in the outflowing clean gas flue gas medium flow to be reached NO x Sollachesteil for a required reducing agent mass flow lt and / or readjusted.
  • the flue gas denitrification reactor is arranged downstream of a flue gas dedusting with respect to the flow direction of the flue gas leaving the steam generator or boiler, so that a so-called low-dust circuit is present.
  • the method according to the invention is characterized in that it is catalytically de-nitrogening during operation of a downstream dedusting and / or desulfurization of the flue gas mass flow
  • Flue gas denitration reactor is performed.
  • the influence of a particular reducing agent injection in a respective reducing agent injection zone on the individual NO x analysis zones is determined empirically during the commissioning of the flue gas denitrification reactor and stored in one or more of the association ratios mapping matrix / matrices in the form of numerical values in the control device.
  • the invention is characterized in a further development in that a matrix-like assignment or matrix-like assignments of one of the plurality of NO x -Analysezonen to one or more reducing agent injection zones and first output NO x readings to be adjusted flue gas middle mass flow during commissioning of the flue gas denitrification reactor empirically determined and, in particular in the control device, deposited / will.
  • the matrix determined during commissioning is expediently maintained during operation of the flue gas denitrification reactor, so that the invention also provides that the determined and deposited matrix-like assignment or the determined and stored matrix-like assignments are / remains unchanged during operation of the flue gas denitration reactor.
  • this approach of empirically determining the matrix-like relationships does not require the number of NOx analysis zones to match the number of reductant injection zones.
  • the matrix-type assignment can differ depending on the amount of smoke gas, so that it is also possible to deposit more than one matrix.
  • the method according to the invention is characterized in that the matrix-type assignment or the matrix-like assignments of reducing agent injection zones and NO x analysis zones is / are formed differently depending on the quantity of flue gas.
  • the measurement intervals may be different, so that the invention further provides in development of the method that the online permanently determined measurements of first output NO x content, desired starting NO x content, input NO x content, inflowing raw gas flue gas mass flow and / or flowing clean gas flue gas mass flow continuously or periodically measured at short intervals.
  • Preferred reducing agents are ammonia and urea, so that advantageously further provided that as a reducing agent gaseous or liquid ammonia (NH 3 ), an ammonia-containing solution, in particular ammonia water, an ammonium chloride solution or urea as Reductant mass flow supplied and injected as reducing agent mass sub-stream in the raw gas flue gas mass flow.
  • a reducing agent gaseous or liquid ammonia NH 3
  • the flue gas denitrification plant is characterized for carrying out a particularly advantageous method in a further development in that the NO x - exhaust and / or NO x -Analysevoriquesen are each in a first signal-conducting line connection with the control device, which determined this first output NO x - Analyzer-related, which allocates them by means of a matrix deposited in the control device matrix one or more reducing agent injection zones, and wherein the control device via each a second signal-conducting line connection with each of a respective reducing agent mass flow to a respective connected reducing agent injection regulating, automatically adjustable control valves is and corresponding to the control valves of the matrix-like assignment of the reducing agent injection zones to the analysis zone-related first output NO x measurements, the respective Reduktionsmi
  • the reductant partial mass flow required in each of the reductant injection zones is in each
  • Analyzing apparatus is connected via a or the first signal conducting line connection with the control means in line connection, via which the respectively each NO x -Analysezone measured first Au sgangs-NO x -M esswert a first output NO x content of the second flow cross section by flowing clean gas flue gas mass flow the control device is supplied to the respective output NO x -Messwert matrix-like one or more reducing agent injection zone (s) and each one in the or each associated reducing agent injection zone (s) to achieve the desired output NO x content each currently claimeddüsenden Assigning reducing agent mass fraction representing value and wherein the control means each of the respective one or more Reduktionsstoff- Eindüsungszonen associated values via one of the second signal-conducting line connections each one of a Reduktionsstoff- injection associated with a reduction agent injection and the distribution of the reducing agent mass flow to each reducing agent partial flow causing control valve as a control signal, the automatically adjusts the reduction medium partial flow to be
  • the flue gas denitrification downstream of the catalyst region has a second flue gas mass flow measuring the exhaust gas pure flue gas mass flow which is signal conductively connected to the control unit and set to be permanently online during operation of the flue gas denitration reactor and during online the operation of the flue gas denitrification reactor the downstream clean gas flue gas mass flow downstream of the catalyst area and the control device for determining the currently required to achieve the desired output NO x content in flowing out of the flue gas denitrification reactor clean gas flue gas mass flow reducing agent mass flow a current clean gas flue gas mass flow representing Supply measuring signal.
  • the flue gas denitrification plant is further distinguished by the fact that upstream of the catalyst region, it is a first flue gas mass flow measuring device which measures the inflowing raw gas flue gas mass flow and / or downstream of the catalyst region, which separates the outgoing clean gas.
  • Flue gas mass flow measuring second flue gas mass flow measuring point upstream of the first plane formed by the reducing agent Eindüsungszonen a the input NO x content of the incoming raw gas flue gas mass flow measuring input NO x measuring point and downstream the second level formed by the NO x -Analysezonen has a desired output NO x content of the outflowing pure gas flue gas mass flow measuring output NO x measuring point, which are permanently operated online during operation of the flue gas denitrification reactor.
  • the flue gas denitrification system comprises a control circuit in the third signal-conducting line connection with the control device, in the fourth signal-conducting line connection with an input NO x measuring point, in the fifth signal-conducting line connection with the outgoing clean gas flue gas mass flow measuring second Rauchgasmassenstrommessstelle and in sixth signal-conducting line connection with the output NOx measuring point, which determine online during the operation of the flue gas denitrification reactor permanently measured values and the control loop, the processing of a NO x setpoint the currently required reductant mass flow and / or its distribution the individual reducing agent partial mass flows are determined and regulated in a regulated manner.
  • control valves are designed as PID (Proportional Integral Derivative) control valves.
  • PID Proportional Integral Derivative
  • the flue gas denitrification plant is characterized in an embodiment in that the control circuit and / or the control device depending on the operating situation in undertakendüsende in the inflowing raw gas flue gas mass flow first flow cross section reductant mass flow as a function of the load requested by the associated steam generator and / or in dependence on the Rauchgasentstickungsreaktor inflowing crude gas flue gas mass flow or determined from the flue gas denitrification reactor clean gas flue gas mass flow determines and regulates.
  • the flue gas denitrification system is characterized in an embodiment in that the reducing agent injection zones and the NOx analysis zones each cover the entire first or second flow cross-section without gaps in the first or second plane formed by them.
  • the single FIGURE shows a schematic representation of a flue gas denitrification reactor 1, the catalyst region 2 of which comprises three catalyst layers 3.
  • the catalyst region 2 can be supplied via a flue gas duct 4 via a raw gas flue gas mass flow 30 flowing in from a fossil-fueled steam generator of a power plant, that is to say a raw gas flue gas quantity.
  • the flue gas denitration reactor 1 operates according to a flue gas catalytically entstickenden process, the so-called SCR process, including the input side of the catalyst layers 3 having catalyst region 2 reducing agent, in particular an ammonia (NH 3 ) or urea-containing agent is injected into an incoming crude gas flue gas mass flow 30 which raw gas flue gas mass flow 30 then flows through the catalyst region 2 and on the output side as de-dense pure gas flue gas mass flow 27, ie a clean gas flue gas quantity, into a chimney of the power plant leading exhaust pipe 5 opens.
  • SCR process including the input side of the catalyst layers 3 having catalyst region 2 reducing agent, in particular an ammonia (NH 3 ) or urea-containing agent is injected into an incoming crude gas flue gas mass flow 30 which raw gas flue gas mass flow 30 then flows through the catalyst region 2 and on the output side as de-dense pure gas flue gas mass flow 27, ie a clean gas flue gas quantity, into a chimney of the power plant
  • the injection of reducing agent takes place on the inlet side and upstream of the catalyst region 2 in a flow-through from the incoming crude gas flue gas mass flow 30 first flow cross-section 6, which is formed in a first flue gas or flue gas denitrification reactor section 7.
  • first flow cross-section 6 are several, nine in the embodiment Reductant injection zones 8 are formed, each having a reducing agent injection 9. Due to their relative position to the catalyst region 2 of the flue gas denitrification reactor 1, the reducing agent injection zones 8 are connected upstream of the catalyst region 2 of the flue gas denitrification reactor 1.
  • Each reducing agent injection zone 8 covers in each case a partial area or a partial area of the catalyst zone 2 the inflowing raw gas flue gas mass flow 30 supplying first flow cross section 6, wherein the reducing agent injection zones 8 in total, ie in their entirety, the total formation of a first plane 32 the Cover entire entire flow cross-section 6.
  • the catalyst region 2 of the flue gas denitrification reactor 1 is followed by a plurality of, in the exemplary embodiment, eight, NO x analysis zones 12, arranged and arranged, in a second flow cross section 10 of a second flue gas denitrification reactor section 1 1 discharging the clean gas flue gas mass flow 27 out of the catalyst region 2.
  • Each NO x analysis zone 12 includes a NO x exhaust and / or NO x analysis device 13.
  • Each NO x -Analysezone 12 each covers a partial surface of the outflowing clean gas flue gas mass flow 27 from the
  • Catalyst region 2 discharging second flow cross-section 10 of the second flue gas or flue gas denitration reactor section 1 1, wherein all the NOx analysis zones 12 together total, i. in their entirety, cover the entire second flow cross-section 10.
  • the total denoted by 14 flue gas denitrification plant comprises a control and / or regulating circuit 15, the component of which is a control device 16.
  • the controller 16 is connected via a respective first signal conducting line connections 17 with one of the NO x - extraction and / or NO x -Analysevorlegizieren 13 in line connection, via which determined on a respective NO x -Absaugungs- and / or NO x -Analysevorraum 13 first output NO x measured values based on analysis zones, ie determined separately per NO x analysis zone 12, can be fed to the regulating device 16.
  • control device 16 via second signal-conducting Line connections 18 are connected to PID control valves 19, which in turn are in a fluid-conducting and fluid-carrying line connection 24 each with a reducing agent injection 9 and each of the inflow of Reduktionsstoffteilmassenstroms 31 of the flue gas denitration reactor 1 and supplied and supplied in several, the number of Reduktionsstoffeindüsungen 9 corresponding partial mass flows 31 divided reducing agent mass flow 29 to a respective reducing agent injection 9 and thus a reducing agent injection zone 8 regulate.
  • control device 16 is further designed so that it automatically assigns by adjusting the control valves 19 according to a stored in her matrix, which assigns each NO x -Analysezone 12 one or more reducing agent injection zone (s) 8 during operation of the flue gas denitrification system 14 from a reducing agent injection 9 each reductant partial mass flow 31 to be delivered in response to the first output NO x measured value determined in a respectively assigned NO x -Analysezone 12 controls and outputs.
  • This takes place in that the control device 16 outputs corresponding control signals to the respectively connected and controlled control valves 19 via the second line connections 18 corresponding to the number of control valves 19 connected to the control device 16.
  • the respective reducing agent partial mass flow 31 is in each case regulated in such a way that precisely the amount of reducing agent required in the respective reducing agent injection zone 8 for setting a first starting NO x setpoint value to be achieved in the or each NO x analysis zones assigned in a matrix-like manner first flow cross-section 6 is injected into the incoming crude gas flue gas mass flow 30.
  • Control valve 22 the total reducing agent mass flow 29 can be adjusted automatically and control valves 19, the distribution to the reducing agent injections 9 is automatically set with each other. It is also possible for the control valve 22 to be omitted and the reducing agent partial mass flows 31 to the respective reducing agent
  • Injection zones 8 with associated reductant injection 9 are each automatically set directly via the control valves 19.
  • the ⁇ -suction and / or NO x -Analysevoriquesen 13 are permanently and fixed in the in the the outgoing pure flue gas mass flow from the catalyst region 2 laxative second flow section 10 of the second flue gas or flue gas denitration reactor section 1 1 of the flue gas denitration reactor 1 arranged NO x -Analysezonen 12 formed.
  • the NO x -Absaugungs- and / or NO x -Analysevorettien13 form of a measuring grid or NO x -Messgitter, the forming by the in its entirety a second plane 35 NO x -Analysezonen 12 is formed and with which during operation of the Rauchgasentstickungsreaktors 1 permanently online continuously or periodically at short intervals per NO x -Analysezone 12 of the first output NO x content 37 of the flowing in the clean gas flue gas mass flow 27 second flow cross section 10 flowing flue gas can be determined.
  • the determination of the individual NO x zone values can be carried out continuously or periodically in short or short time intervals, wherein the period of the periodic query is chosen so short that the temporal changes of the NOx concentration profiles are detected in the second level 35 formed as a measurement plane.
  • the control device 16 is designed and set up so that it can be injected into the incoming raw gas flue gas mass flow 30 as a function of the load demanded from the associated steam generator and / or as a function of the flue gas denitrification reactor 1 or the operating gas being fed into the first flow cross section 6 determined from the flue gas denitrification reactor 1 discharged flue gas mass flow and controls.
  • the control device 16 also forms a control device.
  • Control of the addition of reducing agent by means of the admitteddüsenden flue gas mass flow 29 via the determination of the output NO x content 28 in the flue gas denitrification reactor 1 via the exhaust pipe 5 leaving the clean gas flue gas mass flow 27 includes a supply of at one Output NOx measuring point 36 determined desired NO x output content 28 via a sixth signal-conducting line connection 20 to the control circuit 15, the detection of the input NO x content 33 of the incoming raw gas flue gas stream 27 at an input NOx measuring point 26th and the supply of the measured value ascertained here via a fourth signal-conducting line connection 21 to the control circuit 15 and the control of a control valve 22 derived from at least these two values and the comparison with a NO x setpoint 34 by means of a control signal supplied via a seventh signal-conducting line connection 23 wherein the control valve 22 regulates the reducing agent mass flow 29 flowing to all or individual reducing agent injections 9.
  • a central control and injection of reducing agent by the reducing agent mass flow 29 of denitrification 14 fed centrally and then divided into flue gas partial streams 31 the individual Control valves 19 is supplied. It can be done with the flue gas denitrification 14 of the invention but also a decentralized control in which the control valves 19 each directly a reducing agent mass flow 31 is supplied and each currently required Reduktionsstoffteilmassenstrom 31 respectively by opening or closing the individual, each one reducing agent injection 9 and is adjusted, adjusted or readjusted with this in fluidly connected control valves 19.
  • control valves 19 are controlled in particular such that the total reducing agent mass flow 29 set by the control valve 22 is distributed to the individual reducing agent injection zones 8.
  • the control valves 19 may assume a position between closed and fully open.
  • control valve 22 In a decentralized control, the control valve 22 is fully opened or deleted altogether.
  • the individual control valves 19 are controlled so that the individual reducing agent injection zones 8 directly directly desired reduction mass fraction 31 and thus the desired amount of reducing agent.
  • the assignment of the individual NO x analysis zones 12 to one or more reducing agent injection zones 8 and reducing agent injections 9 takes place by setting up a matrix, wherein a plurality of matrices are formed depending on the respective raw gas flue gas mass flow 30 to be treated and stored in the control device 16 can be.
  • the matrix-like assignment of reducing agent injection zones 8 and NO x analysis zones 12 is determined empirically during commissioning of the flue gas denitrification reactor 1 and then deposited in the control device 16, the determined and deposited matrix-like assignment or the determined and deposited matrix-like assignments during operation of the flue gas denitration reactor 1 is / are maintained unchanged.
  • Reductant partial mass flow to 15% of the reducing agent injection zone 8D and thus the reductant medium mass flow injected here and 10% of the reducing agent injection zone 8E and the reducing agent partial mass flow injected here being affected.
  • These relationships are represented as a matrix, determined for all NO x analysis zones 12 and stored in the form of a matrix or multiple matrices in the control device 16.
  • the outflowing clean gas flue gas mass flow 27 in the exhaust pipe 5 at a second flue gas mass flow measuring point 39 or second flue gas metering point the outflowing clean gas flue gas mass flow 27, so the outflowing clean gas flue gas quantity measured, the determined measured value via a fifth signal-conducting line connection 25 input to the control and / or control circuit 15th and the control device 16 finds.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Treating Waste Gases (AREA)

Abstract

L'invention concerne un procédé permettant de faire fonctionner un réacteur de dénitruration de gaz de combustion (1) dénitrurant de manière catalytique un gaz de combustion, plusieurs zones d'injection d'agent de réduction (8) comprenant respectivement au moins un orifice d'injection d'agent de réduction (9) associé et plusieurs zones d'analyse de NOx (12) comprenant respectivement au moins un dispositif d'analyse de NOx (13) associé étant prévues. L'invention vise à permettre la dénitruration de manière catalytique et fiable du flux de gaz de combustion d'un générateur de vapeur d'une centrale électrique même en cas de fonctionnement dans des plages de charge faibles. À cet effet, pendant le fonctionnement du réacteur de dénitruration de gaz de combustion (1), une première valeur de mesure de NOx de sortie est mesurée en permanence en continu pour chaque zone d'analyse de NOx, en aval de la région de catalyseur (2), dans les zones d'analyse de NOx, la première valeur de mesure de NOx de sortie obtenue est associée sous forme matricielle à une ou plusieurs zones d'injection d'agent de réduction (8) et est associée respectivement à au moins une valeur représentant un débit massique partiel d'agent de réduction (31) et chaque débit massique partiel d'agent de réduction (31) est réglé pour chaque zone d'injection. Chaque zone d'analyse de NOx recouvre respectivement une partie de la section transversale d'écoulement (10) d'une partie de réacteur de dénitruration de gaz de combustion (11) évacuant le débit massique de gaz de combustion épuré (27) et les zones d'analyse de NOx forment dans leur ensemble un plan recouvrant la section transversale d'écoulement (10).
EP18720559.6A 2017-04-20 2018-04-20 Procédé permettant de faire fonctionner un réacteur de dénitruration de gaz de combustion dénitrurant de manière catalytique un gaz de combustion et système de dénitruration de gaz de combustion comprenant un réacteur de dénitruration de gaz de combustion approprié pour la mise en uvre du procédé Withdrawn EP3612292A1 (fr)

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DE102017108443.6A DE102017108443A1 (de) 2017-04-20 2017-04-20 Verfahren zum Betrieb eines Rauchgas katalytisch entstickenden Rauchgasentstickungsreaktors und Rauchgasentstickungsanlage mit einem für die Durchführung des Verfahrens geeigneten Rauchgasentstickungsreaktor
PCT/EP2018/060220 WO2018193108A1 (fr) 2017-04-20 2018-04-20 Procédé permettant de faire fonctionner un réacteur de dénitruration de gaz de combustion dénitrurant de manière catalytique un gaz de combustion et système de dénitruration de gaz de combustion comprenant un réacteur de dénitruration de gaz de combustion approprié pour la mise en œuvre du procédé

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CN110652866A (zh) * 2019-05-29 2020-01-07 大唐陕西发电有限公司 一种scr烟气脱硝的喷氨流量计控制逻辑优化
CN110568129B (zh) * 2019-09-26 2024-03-12 国能龙源环保有限公司 一种SCR脱硝出口混合及分区烟气NOx浓度检测系统及其方法
CN113457437A (zh) * 2021-06-25 2021-10-01 华能(大连)热电有限责任公司 一种用于燃煤电厂提升脱硝反应器出口cems测点前烟道流场分布均匀性的装置
CN114534458B (zh) * 2022-03-09 2023-04-07 山东爱亿普环保科技股份有限公司 一种喷射脱硝还原剂的控制方法和装置

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