Process regulation and control method and system for ammonia-doped combustion of coal power unit
By arranging an ammonia catalytic decomposition reactor in a coal-fired power unit and monitoring the temperature, the ammonia gas flow rate was adjusted, which solved the problem of poor matching between the ammonia gas flow rate and the operating conditions, improved the ammonia catalytic cracking efficiency and combustion stability, and reduced nitrogen oxide emissions.
Patent Information
- Application Number
- CN202511314362.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-15
- Publication Date
- 2025-12-16
AI Technical Summary
In existing technologies, the ammonia injection rate and operating conditions are poorly matched when ammonia is added to coal-fired power units, resulting in low ammonia catalytic cracking efficiency and insufficient combustion stability.
An ammonia catalytic decomposition reactor is installed in a coal-fired power unit, and multiple temperature measuring points are set up within its preset range. The load temperature is monitored through these measuring points, and the ammonia gas flow rate is adjusted based on the temperature data to control the ammonia gas entering the catalytic decomposition reactor for catalytic cracking and premixed combustion.
It enables precise control of the ammonia-infused combustion process in coal-fired power units, improves ammonia catalytic cracking efficiency and combustion stability, and reduces nitrogen oxide emissions.
Smart Images
Figure CN121139949A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of coal power combustion, in particular to a process control method and system for ammonia-doped combustion of a coal power unit. BACKGROUND
[0002] In the prior art, compared with hydrogen and methane and other gas fuels, the reactivity of ammonia fuel is obviously lower, the maximum laminar flame speed is only one fifth of that of methane, the flame limit is also narrower, and the ignition temperature is also higher. Ammonia lean combustion will produce higher nitrogen oxide emissions, and rich combustion will produce higher ammonia escape. When the coal power unit is doped with ammonia combustion, it is easy to bring risks to the combustion stability of the boiler and the control of nitrogen oxide emissions. Especially in the process of building a new power system, the coal power unit is more operated in the low load range, and the stability of ammonia-coal mixed combustion and the control of pollutant emissions are more difficult.
[0003] The prior art has the technical problem that when the coal power unit is doped with ammonia combustion, the ammonia gas input amount and the working condition matching are poor, resulting in low ammonia catalytic cracking efficiency and insufficient combustion stability. SUMMARY
[0004] The present application provides a process control method and system for ammonia-doped combustion of a coal power unit, which is used to solve the technical problem that in the prior art, when the coal power unit is doped with ammonia combustion, the ammonia gas input amount and the working condition matching are poor, resulting in low ammonia catalytic cracking efficiency and insufficient combustion stability.
[0005] In view of the above problems, the present application provides a process control method and system for ammonia-doped combustion of a coal power unit.
[0006] In a first aspect of the present application, a process control method for ammonia-doped combustion of a coal power unit is provided, the method comprising:
[0007] arranging an ammonia catalytic decomposition reactor; arranging a plurality of temperature measuring points within a preset range of the ammonia catalytic decomposition reactor, monitoring the temperature of the load working condition of the coal power unit through the plurality of temperature measuring points, and obtaining a plurality of working condition temperature data; adjusting and analyzing the ammonia gas input amount based on the plurality of working condition temperature data, determining the ammonia gas input adjustment amount; and controlling the ammonia gas to enter the ammonia catalytic decomposition reactor for catalytic cracking and premixed combustion according to the ammonia gas input adjustment amount.
[0008] In a second aspect of the present application, a process control system for ammonia-doped combustion of a coal power unit is provided, the system comprising:
[0009] The reactor arrangement module is used for arranging an ammonia catalytic decomposition reactor; the working condition temperature data acquisition module is used for arranging a plurality of temperature measuring points in a preset range of the ammonia catalytic decomposition reactor, and a plurality of working condition temperature data are obtained by monitoring the temperature of the load working condition of the coal-fired generating unit through the plurality of temperature measuring points; the adjustment analysis module is used for adjusting and analyzing the ammonia gas input amount based on the plurality of working condition temperature data, and determining an ammonia gas input adjustment amount; and the catalytic cracking module is used for controlling the ammonia gas to enter the ammonia catalytic decomposition reactor for catalytic cracking and premixing combustion according to the ammonia gas input adjustment amount.
[0010] The one or more technical solutions provided in the present application have at least the following technical effects or advantages:
[0011] The ammonia catalytic decomposition reactor is arranged; a plurality of temperature measuring points are arranged in a preset range of the ammonia catalytic decomposition reactor, and a plurality of working condition temperature data are obtained by monitoring the temperature of the load working condition of the coal-fired generating unit through the plurality of temperature measuring points; the ammonia gas input amount is adjusted and analyzed based on the plurality of working condition temperature data, and an ammonia gas input adjustment amount is determined; and the ammonia gas is controlled to enter the ammonia catalytic decomposition reactor for catalytic cracking and premixing combustion according to the ammonia gas input adjustment amount. The technical effect of realizing precise regulation and control of the ammonia-doped combustion process of the coal-fired generating unit is achieved, and the ammonia catalytic cracking efficiency and the combustion stability are improved. BRIEF DESCRIPTION OF DRAWINGS
[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0013] Figure 1 A flowchart of a process regulation method for ammonia-doped combustion of a coal-fired generating unit is provided for the embodiments of the present application.
[0014] Figure 2 A process flow principle diagram of a process regulation method for ammonia-doped combustion of a coal-fired generating unit is provided for the embodiments of the present application.
[0015] Figure 3 A structure diagram of a process regulation system for ammonia-doped combustion of a coal-fired generating unit is provided for the embodiments of the present application.
[0016] Marked legend: reactor arrangement module 10, working condition temperature data acquisition module 20, adjustment analysis module 30, catalytic cracking module 40. DETAILED DESCRIPTION
[0017] The application provides a process control method and system for ammonia-doped combustion of a coal power unit, and aims to solve the poor matching between ammonia gas input and working conditions in ammonia-doped combustion of a coal power unit in the prior art, which leads to low ammonia catalytic cracking efficiency and insufficient combustion stability.
[0018] The technical solutions in the embodiments of the application will be clearly and completely described in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.
[0019] Embodiment one, as shown in the drawings, Figure 1 , Figure 2 The application provides a process control method for ammonia-doped combustion of a coal power unit, which comprises the following steps:
[0020] Step S100: arranging an ammonia catalytic decomposition reactor.
[0021] Specifically, when arranging the ammonia catalytic decomposition reactor, in order to avoid additional heat exchange devices, the ammonia catalytic decomposition reactor is arranged on the water-cooled wall surface of the furnace close to the burner, and the heat radiated by the flame in the furnace provides the required heat source for the catalytic reaction; meanwhile, the size of the reactor is determined according to the activity of the catalyst and the size of the space velocity, wherein the catalyst is a metal catalyst (the active component is one or a combination of oxides of Ru / Ni / Fe / Co / Cu, and the carrier is one or a combination of CeO2 / active Al2O3 / TiO2 / molecular sieve, etc.), so as to adapt to the needs of the ammonia catalytic decomposition reaction.
[0022] Step S200: arranging a plurality of temperature measuring points in the preset range of the ammonia catalytic decomposition reactor, monitoring the temperature of the load working condition of the coal power unit through the plurality of temperature measuring points, and obtaining a plurality of working condition temperature data.
[0023] Specifically, a plurality of temperature measuring points are arranged in the preset range of the ammonia catalytic decomposition reactor, because the temperature in the furnace of the coal power unit is different under different load working conditions, and the ammonia catalytic decomposition reaction needs to be carried out in a temperature window of 450-600℃, therefore, the temperature change around the reactor is monitored in real time through these temperature measuring points, so as to obtain a plurality of working condition temperature data corresponding to different load working conditions, which provides a basis for subsequent adjustment of the ammonia gas input amount according to the temperature condition and ensures that the ammonia gas decomposition efficiency is stable in a suitable range.
[0024] Step S300: adjusting and analyzing the ammonia gas input amount based on the plurality of working condition temperature data, and determining the ammonia gas input adjustment amount.
[0025] Specifically, when adjusting and analyzing the ammonia input amount based on multiple working condition temperature data, the ammonia input adjustment amount is determined by the following means: first, compare the monitored working condition temperature data with the 450-600℃ temperature window required for ammonia catalytic decomposition reaction, and determine whether the current reactor ambient temperature is in the appropriate interval; then, according to the specific value and trend of the temperature deviating from the interval, combined with the reactor processing capacity determined by the catalyst activity and space velocity, establish the corresponding adjustment relationship between temperature and ammonia input amount, for example, when the temperature is lower than 450℃, reduce the ammonia input amount to avoid decomposition efficiency decline due to insufficient reaction conditions, when the temperature is higher than 600℃, appropriately increase the ammonia input amount to utilize more ammonia to participate in the reaction to balance the temperature; finally, according to the adjustment relationship, calculate and determine the ammonia input adjustment amount suitable for the current working condition, taking the design processing capacity of the ammonia catalytic decomposition reactor in the appropriate temperature interval of 450-600℃ as the reference value, for example, when the temperature is stable at 500℃, set the initial ammonia input reference amount as Q0; then, according to the deviation value of the real-time monitored temperature from the reference temperature (such as 500℃), combined with the pre-set temperature-flow correction coefficient (such as ±5% ammonia input amount adjustment corresponding to each 10℃ deviation), calculate the basic adjustment amount, for example, when the temperature drops to 430℃ (70℃ lower than the reference value), the basic adjustment amount is Q0x(1-70℃ / 10℃x5%); then, according to the current activity decay coefficient of the catalyst (obtained by fitting the running time and historical data) and the ratio of the actual space velocity to the design space velocity, the basic adjustment amount is modified again, such as multiplying by 0.8 correction coefficient when the catalyst activity decreases to 80%, multiplying by 1.2 correction coefficient when the space velocity is 1.2 times the design value; the final corrected value is the ammonia input adjustment amount suitable for the current working condition, which ensures that when the temperature deviates from the appropriate interval, the ammonia decomposition efficiency can be accurately adjusted to avoid the decline of ammonia decomposition efficiency, and the reaction temperature can be balanced, so that the final ammonia decomposition efficiency is stable in a reasonable range of more than 90%, ensuring that the ammonia decomposition efficiency is stable in a reasonable range.
[0026] Step S400: Control the ammonia into the ammonia catalytic decomposition reactor for catalytic cracking and premixed combustion according to the ammonia input adjustment amount.
[0027] Specifically, according to the determined ammonia gas input adjustment amount, liquid ammonia in the ammonia storage tank is first delivered to the ammonia evaporator, and the liquid ammonia is converted into ammonia gas through the evaporator; then, the ammonia gas is delivered to the vicinity of the hearth through the pipeline and introduced into the ammonia catalytic decomposition reactor, in which the ammonia gas is catalytically cracked into hydrogen and nitrogen under the action of a metal catalyst (the active component is one or a combination of oxides of Ru / Ni / Fe / Co / Cu, and the carrier is one or a combination of CeO2 / active Al2O3 / TiO2 / molecular sieve, etc.) in a temperature window of 450-600 DEG C; the ammonia, hydrogen and nitrogen mixed gas formed after cracking is discharged from the reactor outlet and enters the central air pipe, primary air, secondary air or newly added inlet of the burner, and is premixed with the coal powder, and the finally mixed fuel enters the hearth to complete the combustion process.
[0028] In one possible implementation manner, the step S100 further includes:
[0029] The step S110 is to arrange the ammonia catalytic decomposition reactor on the water-cooled wall surface of the hearth, wherein the water-cooled wall surface is adjacent to the burner, and the heat radiated by the flame in the hearth provides a heat source for the catalytic reaction.
[0030] Specifically, the ammonia catalytic decomposition reactor is arranged on the water-cooled wall surface of the hearth adjacent to the burner, which can rely on the heat radiated by the flame in the hearth to provide the required heat source for the catalytic reaction, thereby avoiding the additional increase of the heat exchange device. Meanwhile, the size of the reactor is determined according to the activity of the catalyst and the size of the air speed, and the catalyst used is a metal catalyst, the active component of which is one or a combination of oxides of Ru / Ni / Fe / Co / Cu, and the carrier of which is one or a combination of CeO2 / active Al2O3 / TiO2 / molecular sieve, etc., to meet the needs of the ammonia catalytic decomposition reaction.
[0031] In one possible implementation manner, the step S400 further includes:
[0032] The step S410 is to convert the liquid ammonia into ammonia gas through the ammonia storage tank and the ammonia evaporator.
[0033] The step S420 is to deliver the ammonia gas to the hearth through the pipeline according to the ammonia gas input adjustment amount, and introduce the ammonia gas into the ammonia catalytic decomposition reactor, in which the ammonia gas is cracked into hydrogen and nitrogen under the action of a catalyst.
[0034] The step S430 is to introduce the ammonia, hydrogen and nitrogen mixed gas at the outlet of the ammonia catalytic decomposition reactor into the central air pipe, primary air, secondary air or newly added inlet of the burner, and premix the mixed gas with the coal powder, and then introduce the premixed fuel into the hearth for combustion.
[0035] Specifically, the conversion of liquid ammonia to ammonia gas is achieved by the following means: liquid ammonia is output from the ammonia storage tank, transported through a pipeline to the ammonia evaporator, and heated to vaporize and convert into gaseous ammonia gas using the heat exchange function of the ammonia evaporator, providing gaseous raw material for subsequent catalytic cracking in the ammonia catalytic decomposition reactor. The entire process does not require additional complex devices and relies on the connection structure of the existing storage tank and evaporator to complete the conversion and transportation of liquid ammonia to ammonia gas.
[0036] According to the determined ammonia gas injection adjustment amount, the ammonia gas converted by the ammonia evaporator is transported through a pipeline to the vicinity of the furnace, and then introduced into the ammonia catalytic decomposition reactor arranged on the water-cooled wall surface near the burner of the furnace. In the reactor, ammonia gas undergoes catalytic cracking reaction at a temperature window of 450-600℃ under the action of a metal catalyst (active component is one or a combination of oxides of Ru / Ni / Fe / Co / Cu, carrier is one or a combination of CeO2 / active Al2O3 / TiO2 / molecular sieve, etc.), and is decomposed into hydrogen and nitrogen. The reactor relies on the heat provided by the flame radiation in the furnace to provide the heat source required for catalytic reaction, without the need for additional heat exchange devices.
[0037] The mixed gas of ammonia, hydrogen and nitrogen discharged from the outlet of the ammonia catalytic decomposition reactor enters the combustion system through the central air pipe, primary air, secondary air or newly added inlet of the burner, and is premixed with coal powder. The mixed fuel is burned in the furnace to form an ammonia / hydrogen / coal mixed combustion atmosphere. The high diffusivity and low ignition energy requirement of hydrogen can improve the combustion characteristics of ammonia, increase the overall combustion efficiency, such as accelerating the oxidation reaction of ammonia, shortening the ignition delay time, enhancing the heating rate of coal particles to promote volatile release and ignition, while reducing nitrogen oxide emissions, achieving a high-efficiency, stable and low-pollution combustion process.
[0038] In one possible implementation, step S430 further includes:
[0039] Step S431: the reaction temperature window of the ammonia catalytic decomposition reactor is 450-600℃.
[0040] Specifically, the reaction temperature window of the ammonia catalytic decomposition reactor is 450-600℃. This temperature range is a key condition to ensure that ammonia gas effectively undergoes catalytic decomposition reaction under the action of a metal catalyst (active component is one or a combination of oxides of Ru / Ni / Fe / Co / Cu, carrier is one or a combination of CeO2 / active Al2O3 / TiO2 / molecular sieve, etc.). The setting of this temperature window can not only ensure the smooth cracking of ammonia gas into hydrogen and nitrogen under the action of the catalyst, but also adapt to the heat source environment provided by the flame radiation in the furnace, avoiding the influence of decomposition efficiency due to excessively high or low temperature, and laying a foundation for subsequent premixed combustion with coal powder to form a stable ammonia / hydrogen / coal mixed combustion atmosphere.
[0041] In a possible implementation, step S430 further includes:
[0042] Step S432: the catalyst is a metal catalyst.
[0043] Specifically, it is specified that the catalyst used in the ammonia catalytic decomposition reaction is a metal catalyst, the active component of the metal catalyst is one or a combination of oxides of Ru, Ni, Fe, Co, and Cu, and the catalyst carrier is one or a combination of CeO2, active Al2O3, TiO2, and molecular sieves; such a metal catalyst can play a catalytic role in the temperature window (450-600 DEG C) of the ammonia catalytic decomposition reaction, promote the efficient cracking of ammonia into hydrogen and nitrogen, and provide support for the subsequent formation of an ammonia / hydrogen / coal mixed combustion atmosphere and the improvement of combustion stability and efficiency.
[0044] In a possible implementation, step S432 further includes:
[0045] The active component of the catalyst is one or a combination of oxides of Ru / Ni / Fe / Co / Cu, and the catalyst carrier is one or a combination of CeO2 / active Al2O3 / TiO2 / molecular sieves.
[0046] Specifically, the catalyst is a metal catalyst, wherein the active component is selected from one or a combination of oxides of Ru, Ni, Fe, Co, and Cu, and the carrier is selected from one or a combination of CeO2, active Al2O3, TiO2, and molecular sieves; such a catalyst can play a role in the 450-600 DEG C temperature window of the ammonia catalytic decomposition reaction, promote the efficient cracking of ammonia into hydrogen and nitrogen in the ammonia catalytic decomposition reactor, provide support for the subsequent formation of an ammonia / hydrogen / coal mixed combustion atmosphere, and further help improve combustion stability and efficiency and reduce nitrogen oxide emissions.
[0047] In a possible implementation, step S430 further includes:
[0048] Step S433: the size of the ammonia catalytic decomposition reactor is determined according to the activity of the catalyst and the size of the space velocity.
[0049] Specifically, first of all, the activity parameters of the metal catalyst used (its active component is one or a combination of oxides of Ru / Ni / Fe / Co / Cu, and the carrier is one or a combination of CeO2 / active Al2O3 / TiO2 / molecular sieve, etc.) are determined, and the space velocity of ammonia through the reactor (i.e. the ratio of ammonia flow to catalyst volume per unit time) is determined; then according to the reaction rate determined by the activity of the catalyst, and the residence time of ammonia in the reactor required by the space velocity, the volume, length, cross-sectional area and other size parameters of the reactor are calculated and determined to ensure that ammonia can fully contact the catalyst and complete efficient decomposition at a reaction temperature window of 450-600°C, thereby adapting to the ammonia treatment needs of different load conditions of coal-fired power units.
[0050] Example two, based on the same inventive concept as the process control method for ammonia-doped combustion of a coal-fired power unit in the preceding example, as Figure 3 As shown in the preceding example, the present application provides a process control system for ammonia-doped combustion of a coal-fired power unit, and the system and method embodiments in the present application are based on the same inventive concept. The system comprises:
[0051] The reactor arrangement module 10 is used to arrange an ammonia catalytic decomposition reactor.
[0052] The working condition temperature data acquisition module 20 is used to arrange a plurality of temperature measuring points in a predetermined range of the ammonia catalytic decomposition reactor, to monitor the temperature of the load working condition of the coal-fired power unit through the plurality of temperature measuring points, and to obtain a plurality of working condition temperature data.
[0053] The adjustment analysis module 30 is used to adjust and analyze the ammonia input amount based on the plurality of working condition temperature data, and to determine the ammonia input adjustment amount.
[0054] The catalytic cracking module 40 is used to control the ammonia entering the ammonia catalytic decomposition reactor for catalytic cracking and premixed combustion according to the ammonia input adjustment amount.
[0055] Further, the system is also used to implement the following functions:
[0056] The ammonia catalytic decomposition reactor is arranged on the water-cooled wall surface of the furnace, wherein the water-cooled wall surface is adjacent to the burner, and the heat radiated by the flame in the furnace provides a heat source for the catalytic reaction.
[0057] Further, the system is also used to implement the following functions:
[0058] Liquid ammonia is converted into ammonia gas by ammonia storage tank and ammonia evaporator; the ammonia gas is transported to the furnace by pipeline according to the adjusted amount, and enters the ammonia catalytic decomposition reactor, in which the ammonia gas is cracked into hydrogen and nitrogen under the action of the catalyst; the ammonia gas / hydrogen / nitrogen mixed gas at the outlet of the ammonia catalytic decomposition reactor enters the central air pipe / primary air / secondary air or the newly added inlet of the burner, and is premixed with the pulverized coal before entering the furnace for combustion.
[0059] Further, the system is also used to realize the following functions:
[0060] The reaction temperature window of the ammonia catalytic decomposition reactor is 450-600℃.
[0061] Further, the system is also used to realize the following functions:
[0062] The catalyst is a metal catalyst.
[0063] Further, the system is also used to realize the following functions:
[0064] The active component of the catalyst is one or a combination of oxides of Ru / Ni / Fe / Co / Cu, and the catalyst carrier is one or a combination of CeO2 / active Al2O3 / TiO2 / molecular sieve.
[0065] Further, the system is also used to realize the following functions:
[0066] The size of the ammonia catalytic decomposition reactor is determined according to the activity and space velocity of the catalyst.
[0067] It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments. And the above describes the specific embodiments of the present application. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multi-task processing and parallel processing are also possible or may be advantageous.
[0068] The above only describes the preferred embodiments of the present application, and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
[0069] The specification and drawings are, of course, to be regarded in an illustrative rather than a restrictive sense. It is to be understood that any such modifications, variations, combinations or equivalents that fall within the scope of the application are intended to be embraced herein.
Claims
1. A process control method for ammonia-doped combustion of a coal-fired power unit, characterized in that, The method comprises: arranging an ammonia catalytic decomposition reactor; arranging a plurality of temperature measuring points in a preset range of the ammonia catalytic decomposition reactor, monitoring the temperature of the load condition of the coal-fired power unit through the plurality of temperature measuring points, and obtaining a plurality of condition temperature data; adjusting and analyzing the ammonia input amount based on the plurality of condition temperature data to determine an ammonia input adjustment amount; controlling the ammonia into the ammonia catalytic decomposition reactor for catalytic cracking and premixing combustion according to the ammonia input adjustment amount.
2. The process control method for ammonia slip combustion of a coal-fired unit of claim 1, wherein, The arrangement of the ammonia catalytic decomposition reactor comprises: arranging the ammonia catalytic decomposition reactor on the water-cooled wall surface of the furnace, wherein the water-cooled wall surface is adjacent to the burner, and the heat radiated by the flame in the furnace provides a heat source for the catalytic reaction.
3. The process control method for ammonia slip combustion of a coal-fired power unit as claimed in claim 1, wherein, The ammonia catalytic decomposition reactor comprises: liquid ammonia is converted into ammonia gas through an ammonia evaporator; the ammonia gas is transported to the furnace through a pipeline according to the ammonia input adjustment amount and enters the ammonia catalytic decomposition reactor, and in the ammonia catalytic decomposition reactor, the ammonia gas is cracked into hydrogen and nitrogen under the action of the catalyst; the ammonia / hydrogen / nitrogen mixed gas at the outlet of the ammonia catalytic decomposition reactor enters the central air pipe / primary air / secondary air or a newly added inlet of the burner, and is premixed with pulverized coal and then burned in the furnace.
4. The process control method of an ammonia slip-in combustion of a coal power unit according to claim 3, characterized in that, The reaction temperature window of the ammonia catalytic decomposition reactor is 450-600℃.
5. The process control method for ammonia slip combustion of a coal-fired power plant of claim 3 wherein, The catalyst is a metal catalyst.
6. A process control method for ammonia slip combustion in a coal-fired power plant as recited in claim 5, wherein, The active component of the catalyst is one or a combination of oxides of Ru / Ni / Fe / Co / Cu, and the catalyst carrier is one or a combination of CeO2 / active Al2O3 / TiO2 / molecular sieve.
7. The process control method for ammonia-blended combustion in a coal-fired power unit as described in claim 3, characterized in that, The size of the ammonia catalytic decomposition reactor is determined according to the activity and space velocity of the catalyst.
8. A process control system for ammonia injection combustion of a coal-fired unit, characterized by, The system is used to implement the process control method of the coal-fired power unit ammonia blending combustion according to any one of claims 1-7, and the system comprises: a reactor arrangement module for arranging an ammonia catalytic decomposition reactor; a condition temperature data acquisition module for arranging a plurality of temperature measuring points in a preset range of the ammonia catalytic decomposition reactor, monitoring the temperature of the load condition of the coal-fired power unit through the plurality of temperature measuring points, and obtaining a plurality of condition temperature data; an adjustment and analysis module for adjusting and analyzing the ammonia input amount based on the plurality of condition temperature data to determine an ammonia input adjustment amount; a catalytic cracking module for controlling the ammonia into the ammonia catalytic decomposition reactor for catalytic cracking and premixing combustion according to the ammonia input adjustment amount.