CN114459033A - Ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting - Google Patents
Ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting Download PDFInfo
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- CN114459033A CN114459033A CN202210109577.0A CN202210109577A CN114459033A CN 114459033 A CN114459033 A CN 114459033A CN 202210109577 A CN202210109577 A CN 202210109577A CN 114459033 A CN114459033 A CN 114459033A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 286
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 198
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 161
- 239000001301 oxygen Substances 0.000 title claims abstract description 161
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 161
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 155
- 239000001257 hydrogen Substances 0.000 title claims abstract description 148
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 148
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 100
- 239000007789 gas Substances 0.000 claims abstract description 68
- 230000001105 regulatory effect Effects 0.000 claims abstract description 49
- 238000010304 firing Methods 0.000 claims description 19
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 15
- 229910001882 dioxygen Inorganic materials 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 13
- 238000011217 control strategy Methods 0.000 claims description 9
- 239000000446 fuel Substances 0.000 claims description 9
- 150000002431 hydrogen Chemical class 0.000 claims description 9
- 238000013500 data storage Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 abstract description 5
- 239000002737 fuel gas Substances 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 101710141078 Ammonium transporter Proteins 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/07006—Control of the oxygen supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/08—Controlling two or more different types of fuel simultaneously
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/04—Gaseous fuels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention relates to the technical field of ammonia combustion control, and discloses an ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting. The system comprises a first combustion zone, a second combustion zone, a burner and a gas conditioning module; the first combustion area and the second combustion area are communicated with each other, the burner is arranged in the first combustion area, and ammonia, hydrogen and oxygen can be introduced into both the burner and the second combustion area; when the combustor burns, the gas regulating module regulates the flow of ammonia, hydrogen and oxygen introduced into the combustor and the second combustion area, so that the combustor is rich in combustion after the ammonia, the hydrogen and the oxygen are introduced into the combustor, and the second combustion area is lean in combustion after the ammonia, the hydrogen and the oxygen are introduced into the second combustion area and mixed gas generated by combustion in the first combustion area. The system is characterized in that the flow of ammonia, hydrogen and oxygen introduced into the first combustion area and the flow of oxygen introduced into the second combustion area are adjusted to form rich combustion and lean combustion successively, the injection and combustion rates are high, the temperature rise is fast, the heat effect of fuel gas is improved, the energy is saved, and the carbon emission is reduced.
Description
Technical Field
The invention relates to the technical field of ammonia combustion control, in particular to an ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting.
Background
At present, in the firing process of a ceramic roller kiln, only oxygen and fuel participate in reaction, and nitrogen only serves as a diluent and exists in air, so that the contact area between the oxygen and the fuel is reduced, incomplete combustion is caused, heating is uneven, local high temperature is easily generated, the nitrogen can be favorably reacted with the oxygen at high temperature to generate a large amount of NOx, and the probability of collision reaction between the oxygen and the fuel is greatly reduced. The generated flue gas carries a large amount of heat to be discharged out of the kiln body, so that a large amount of heat loss is caused, and the heat efficiency of the ceramic roller kiln is reduced.
At present, people take ammonia as a new energy source for research, mainly based on two considerations: on one hand, the ammonia is used as a hydrogen storage medium, because the ammonia is easy to liquefy, the ignition temperature is much higher than that of hydrogen, and the ammonia is safer and more convenient to carry compared with hydrogen; on the other hand, the ammonia is a zero-carbon compound, the energy density of the ammonia is high and is 1.5 times that of liquid hydrogen, and the combustion reaction products of the ammonia and oxygen are water and nitrogen, so that the specific energy cost is low. However, ammonia fuels present several challenges: firstly, the combustion speed and the heat value are both low, and the combustion speed is far lower than that of hydrogen, which has certain problems for industrial application; secondly, the calorific value is relatively low, the calorific value is lower than that of other natural gases and hydrogen, the ignition is difficult, and the ignition is not easy to realize and the stable combustion is realized.
Disclosure of Invention
The invention aims to provide an ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting, which aims to solve one or more technical problems in the prior art and at least provides a beneficial selection or creation condition.
The invention provides an ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting, which comprises a first combustion area, a second combustion area, a combustor and a gas adjusting module, wherein the first combustion area is connected with the second combustion area;
the first combustion area and the second combustion area are communicated with each other, the burner is arranged in the first combustion area, and ammonia, hydrogen and oxygen can be introduced into both the burner and the second combustion area;
when the combustor burns, the gas regulating module regulates the flow of ammonia, hydrogen and oxygen introduced into the combustor and the second combustion area, so that the combustor is rich in combustion after the ammonia, the hydrogen and the oxygen are introduced into the combustor, and the second combustion area is lean in combustion after the ammonia, the hydrogen and the oxygen are introduced into the second combustion area and mixed gas generated by combustion in the first combustion area.
Further, when the gas regulating module regulates the flow of the ammonia gas, the hydrogen gas and the oxygen gas introduced into the combustor and the second combustion area, the K is enabled to bea＝3～5，Kha1＝2％～5％，Kha2＝2％～5％，Ko1＞Ko2；
Wherein, KaDenotes the ratio, K, of the ammonia gas fed to the burner and the ammonia gas fed to the second combustion zoneha1Denotes the ratio of ammonia to hydrogen fed to the burner, Kha2Expressing the ratio of ammonia to hydrogen, K, fed to the second combustion zoneo1Denotes the ratio of the oxygen fed to the burner to the amount of oxygen required for complete combustion of the mixture in the first combustion zone, Ko2Represents the ratio of the oxygen input into the second combustion zone to the amount of oxygen required for complete combustion of the mixture in the second combustion zone.
Further, the ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting also comprises a temperature control module;
the temperature control module updates the parameter K output to the gas regulating module according to the firing curve and the firing zone temperaturea，Kha1，Kha2，Ko1，Ko2Controlling the input amount of ammonia, hydrogen and oxygen by the gas regulating module;
the relationship between the input amounts of ammonia, hydrogen and oxygen is:
wherein, Usa1Indicating the ammonia gas input of the burner, Usa2Indicating the ammonia gas input, U, to the second combustion zonesh1Indicating the hydrogen input of the burner, Ush2Indicating the hydrogen input, U, to the second combustion zoneso1Indicating the oxygen input of the burner, Uso2Indicating the oxygen input, U, of the second combustion zoneo1Representing the theoretical oxygen input, U, required for the first combustion zoneo2Representing the theoretical oxygen input required for the second combustion zone.
Furthermore, the temperature control module comprises a temperature detection unit, a parameter setting unit and a data storage unit;
the temperature detection unit is connected with the parameter setting unit and is used for acquiring temperature information of the ceramic roller kiln; the parameter setting unit is used for outputting a gas proportion control signal to the gas regulating module according to the firing curve, the temperature of the firing zone and the temperature information acquired by the temperature detection unit; the data storage module is used for recording data generated by the temperature detection unit and the parameter setting unit.
Furthermore, the temperature control module and the gas regulating module are connected in an RS-485 communication mode.
Further, the gas regulating module respectively calculates the deviation between the set input quantity and the actual input quantity of ammonia, hydrogen and oxygen, calculates an ammonia flow regulating signal, a hydrogen flow regulating signal and an oxygen flow regulating signal through a fuzzy PID control strategy and outputs the signals to the combustor and the second combustion area, so that the actual input quantities of the ammonia, the hydrogen and the oxygen which are accessed into the combustor and the second combustion area are matched with the set input quantities.
Furthermore, the combustor is connected with a first ammonia channel, a first hydrogen channel and a first oxygen channel, the upper wall and the lower wall of the inner cavity of the second combustion area are respectively provided with a plurality of ammonia inlets, hydrogen inlets and oxygen inlets, the ammonia inlets are connected with the second ammonia channel, the hydrogen inlets are connected with the second hydrogen channel, and the oxygen inlets are connected with the second oxygen channel;
the first ammonia channel is provided with a first ammonia actuator, a first ammonia flow sensor and a first ammonia valve, the gas regulating module is respectively connected with the first ammonia actuator and the first ammonia flow sensor, the first ammonia actuator is connected with the first ammonia valve, the second ammonia channel is provided with a second ammonia actuator, a second ammonia flow sensor and a second ammonia valve, the gas regulating module is respectively connected with the second ammonia actuator and the second ammonia flow sensor, and the second ammonia actuator is connected with the second ammonia valve;
the first hydrogen channel is provided with a first hydrogen actuator, a first hydrogen flow sensor and a first hydrogen valve, the gas regulating module is respectively connected with the first hydrogen actuator and the first hydrogen flow sensor, the first hydrogen actuator is connected with the first hydrogen valve, the second hydrogen channel is provided with a second hydrogen actuator, a second hydrogen flow sensor and a second hydrogen valve, the gas regulating module is respectively connected with the second hydrogen actuator and the second hydrogen flow sensor, and the second hydrogen actuator is connected with the second hydrogen valve;
first oxygen passageway is equipped with first oxygen executor, first oxygen flow sensor and first oxygen valve, and first oxygen executor and first oxygen flow sensor are connected respectively to gaseous regulation module, and first oxygen executor is connected with first oxygen valve, and second oxygen passageway is equipped with second oxygen executor, second oxygen flow sensor and second oxygen valve, and second oxygen executor and second oxygen flow sensor are connected respectively to gaseous regulation module, and the second oxygen executor is connected with first oxygen valve.
The invention has the beneficial effects that: the first combustion area meets the rich combustion condition by adjusting the flow of the ammonia gas, the hydrogen gas and the oxygen gas which are introduced into the first combustion area and the second combustion area, the second combustor meets the lean combustion condition, the rich combustion and the lean combustion are successively formed, the injection and combustion speed is high, the temperature rise is fast, the heat effect of fuel gas is improved, the energy is saved, and the carbon emission is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an ammonia combustion control system based on oxygen-rich and hydrogen-rich combustion supporting provided by a first embodiment.
Fig. 2 is a schematic structural diagram of an ammonia combustion control system based on oxygen-rich and hydrogen-rich combustion supporting provided by a second embodiment.
Description of reference numerals: 100. a first combustion zone; 110. a first ammonia gas passage; 120. a first hydrogen passage; 130. a first oxygen channel; 200. a second combustion zone; 210. a second ammonia passage; 220. a second hydrogen channel; 230. a second oxygen channel; 240. an ammonia gas inlet; 250. a hydrogen inlet; 260. an oxygen inlet; 300. a burner; 400. a gas conditioning module; 410. a first ammonia controller; 420. a second ammonia controller; 430. a first hydrogen controller; 440. a second hydrogen controller; 450. a first oxygen controller; 460. a second oxygen controller; 500. a temperature control module; 510. a temperature detection unit; 520. a parameter setting unit; 530. a data storage unit; 610. a first ammonia gas actuator; 620. a second ammonia actuator; 630. a first hydrogen actuator; 640. a second hydrogen actuator; 650. a first oxygen actuator; 660. a second oxygen actuator; 710. a first ammonia gas flow sensor; 720. a second ammonia flow sensor; 730. a first hydrogen flow sensor; 740. a second hydrogen flow sensor; 750. a first oxygen flow sensor; 760. a second oxygen flow sensor; 810. a first ammonia valve; 820. a second ammonia valve; 830. a first hydrogen valve; 840. a second hydrogen valve; 850. a first oxygen valve; 860. a second oxygen valve.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the present invention will be further described with reference to the embodiments and the accompanying drawings.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of the terms are not limited to a certain number, and a plurality of the terms are two or more, and the terms larger, smaller, larger, and the like are understood to include the number of the terms, and the terms larger, smaller, and the like are understood to include the number of the terms. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated. Additionally, appearing throughout and/or representing three side-by-side scenarios, e.g., A and/or B represents a scenario satisfied by A, a scenario satisfied by B, or a scenario satisfied by both A and B.
In the description of the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, which may include other elements not expressly listed, in addition to those listed.
As shown in figure 1, the ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting comprises a first combustion area 100, a second combustion area 200, a combustor 300 and a gas regulating module 400, and is suitable for ceramic roller kilns to fire ceramic products.
The first combustion area 100 and the second combustion area 200 are communicated with each other, the burner 300 is arranged in the first combustion area 100, and ammonia, hydrogen and oxygen can be introduced into both the burner 300 and the second combustion area 200; when the burner 300 burns, the gas regulating module 400 regulates the flow rates of ammonia, hydrogen and oxygen which are introduced into the burner 300 and the second combustion zone 200, so that the burner 300 is introduced with ammonia, hydrogen and oxygen and then is subjected to rich combustion, and the second combustion zone 200 is introduced with ammonia, hydrogen and oxygen and mixed gas generated by combustion in the first combustion zone 100 and then is subjected to lean combustion.
The rich combustion is combustion under the condition that the ratio of fuel gas to combustion-supporting gas is greater than that of stoichiometric flame, the flame generated by the rich combustion is insufficient in combustion, low in temperature, fuzzy in gradation and strong in reduction atmosphere, most elements which are easy to form oxides are suitable for the flame, such as Cr, Ba, Mn and the like, but the flame emission and flame absorption background is strong, the interference is more, and the flame is not as stable as the stoichiometric flame. Lean combustion is combustion carried out under the condition that the ratio of fuel gas to combustion-supporting gas is less than stoichiometric flame, and the flame generated by lean combustion is clear, sufficient in combustion, high in flame temperature and free of reducibility, and is mainly used for atomization of elements which are not suitable for generating oxides. Alkali metals and some high melting inert metals such as Ag, Pb, Pt, Rh, In, etc. are preferably used.
In this embodiment, the gas regulating module 400 controls ammonia gas, hydrogen gas and oxygen gas to enter the first combustion area 100 and directly enter the second combustion area 200 after passing through the burner 300, the burner 300 starts and ignites the mixed gas in the first combustion area 100, and the mixed gas generated by the combustion in the first combustion area 100 enters the second combustion area 200 and ignites the mixed gas in the second combustion area 200. More specifically, the gas adjusting module 400 adjusts the flow rates of the ammonia gas, the hydrogen gas and the oxygen gas introduced into the combustor 300 and the second combustion area 200, so that the mixed gas in the first combustion area 100 meets the rich combustion condition, the mixed gas generated by the combustion of the first combustion area 100 and the ammonia gas, the hydrogen gas and the oxygen gas introduced into the second combustor 300 meets the lean combustion condition, the combustor 300 is started and ignites the mixed gas entering the first combustion area 100 after passing through the combustor 300 to form rich combustion, the injection and combustion rate of the combustor 300 is high, the temperature rise is fast, and after the mixed gas generated by the combustion of the first combustion area 100 enters the second combustion area 200, the second combustion area 200 forms lean combustion, thereby improving the heat effect of the fuel gas, saving energy and reducing carbon emission.
In one embodiment, the gas regulating module 400 regulates the flow of ammonia, hydrogen, and oxygen into the burner 300 and the second combustion zone 200 such that K is equal toa＝3～5，Kha1＝2％～5％，Kha2＝2％～5％，Ko1＞Ko2。
Wherein, KaRepresents the ratio, K, of the ammonia gas input to the burner 300 and the ammonia gas input to the second combustion zone 200ha1Represents the ratio, K, of the ammonia gas and the hydrogen gas input to the burner 300ha2Denotes the ratio of ammonia to hydrogen, K, fed to the second combustion zone 200o1Represents the ratio of the oxygen input to the burner 300 to the amount of oxygen required for complete combustion of the mixture in the first combustion zone 100, Ko2Represents the ratio of the oxygen input to the second combustion zone 200 to the amount of oxygen required for complete combustion of the mixture in the second combustion zone 200.
The main fuel of the burner 300 is ammonia gas, the other fuel is hydrogen gas, and oxygen gas is used as a combustion improver, so that the full combustion of the fuel is promoted, and the flame is more stable. In practical use, the total amount of ammonia introduced into the first combustion zone 100 and the second combustion zone 200 is maintained within a certain range, the flow rates of ammonia, hydrogen and oxygen are automatically adjusted by the gas adjusting module 400, and the proportion of the mixed gas entering the first combustion zone 100 and the mixed gas entering the second combustion zone 200 through the burner 300 is precisely controlled, so that the first combustion zone 100 realizes rich combustion, and the second combustion zone 200 realizes lean combustion.
As shown in fig. 2, based on the embodiment in fig. 1, the ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting of an embodiment further includes a temperature control module 500, and the temperature control module 500 updates the parameter K output to the gas regulating module 400 according to the firing curve and the firing zone temperaturea，Kha1，Kha2，Ko1，Ko2The gas conditioning module 400 is caused to control the input of ammonia, hydrogen, and oxygen.
The firing curve is a curve formed by plotting the temperature at each time point in the whole process from drying, preheating, firing to cooling of the ceramic product on a two-dimensional plane with time as abscissa and temperature as ordinate. The firing curve represents the temperature-time relationship curve of the ceramic green body or the tile in the firing process. The method generally comprises three stages of temperature rise, heat preservation and cooling, at least comprises three stages, and a complex sintering curve can consist of more than 10 stages (namely more than 10 temperature control points).
The burning zone temperature is a key factor influencing the quality and yield of cement clinker or ceramic products, and factors influencing the burning zone temperature are many, such as kiln tail temperature, coal feeding amount, coal heat value, kiln head temperature, primary air quantity, tertiary air temperature, heat dissipation of the surface of a cylinder, kiln clinker temperature, raw material feeding amount, kiln material temperature and the like. In the cement and ceramic industry, clinker formation is liquid phase sintering. From the viewpoint of chemical reaction, higher formation rate can be obtained at higher reaction temperature and longer reaction time under the same other conditions; the same synthesis rate is obtained, and the higher the temperature is, the shorter the reaction time is. According to fick's law, high temperature also has a large influence on the diffusion of solid phase reactions. Modern dry cement production is aimed at high quality, high yield, low consumption, i.e. higher reaction degree, lowest time consumption and thus highest yield, so that when the same content is obtained, it is inevitable to aim for less reaction time, which requires higher reaction temperature.
In this embodiment, the temperature control module 500 obtains the temperature information of the ceramic roller kiln in real time, and updates the parameter K output to the gas conditioning module 400 according to the firing curve and the firing zone temperaturea，Kha1，Kha2，Ko1，Ko2The ceramic roller kiln has higher reaction temperature, so that the reaction degree is improved, and the relation of the input quantities of ammonia, hydrogen and oxygen is as follows:
wherein, Usa1Represents the amount of ammonia gas input, U, to the burner 300sa2Represents the ammonia gas input, U, to the second combustion zone 200sh1Represents the hydrogen input, U, of the burner 300sh2Represents the hydrogen input, U, of the second combustion zone 200so1Indicates the oxygen input, U, of the burner 300so2Represents the oxygen input, U, of the second combustion zone 200o1Represents the theoretical oxygen input, U, required for the first combustion zone 100o2Representing the theoretical oxygen input required for the second combustion zone 200.
In this embodiment, the temperature control module 500 includes a temperature detection unit 510, a parameter setting unit 520, and a data storage unit 530. The temperature detection unit 510 is connected with the parameter setting unit 520, and the temperature detection unit 510 is used for collecting temperature information of the ceramic roller kiln; the parameter setting unit 520 is configured to output a gas proportion control signal to the gas conditioning module 400 according to the firing curve, the firing zone temperature, and the temperature information acquired by the temperature detection unit 510; the data storage module is used for recording data generated by the temperature detection unit 510 and the parameter setting unit 520.
Wherein, the temperature control module 500 and the gas regulating module 400 are connected in an RS-485 communication mode. The parameter setting unit 520 and the data storage unit 530 of the temperature control module 500 may be selected from a PC.
In one embodiment, the gas regulating module 400 calculates the deviation between the set input amount and the actual input amount of ammonia, hydrogen and oxygen, respectively, calculates an ammonia flow regulating signal, a hydrogen flow regulating signal and an oxygen flow regulating signal through a fuzzy PID control strategy, and outputs the signals to the burner 300 and the second combustion zone 200, so that the actual input amounts of ammonia, hydrogen and oxygen, which are accessed by the burner 300 and the second combustion zone 200, are matched with the set input amounts.
Specifically, the burner 300 is connected with a first ammonia gas channel 110, a first hydrogen gas channel 120 and a first oxygen gas channel 130, the upper wall and the lower wall of the inner cavity of the second combustion area 200 are respectively provided with a plurality of ammonia gas inlets 240, hydrogen gas inlets 250 and oxygen gas inlets 260, the ammonia gas inlets 240 are connected with a second ammonia gas channel 210, the hydrogen gas inlets 250 are connected with a second hydrogen gas channel 220, and the oxygen gas inlets 260 are connected with a second oxygen gas channel 230;
the first ammonia gas channel 110 is provided with a first ammonia gas actuator 610, a first ammonia gas flow sensor 710 and a first ammonia gas valve 810, the gas regulating module is respectively connected with the first ammonia gas actuator 610 and the first ammonia gas flow sensor 710, the first ammonia gas actuator 610 is connected with the first ammonia gas valve 810, the second ammonia gas channel 210 is provided with a second ammonia gas actuator 620, a second ammonia gas flow sensor 720 and a second ammonia gas valve 820, the gas regulating module is respectively connected with the second ammonia gas actuator 620 and the second ammonia gas flow sensor 720, and the second ammonia gas actuator 620 is connected with the second ammonia gas valve 820; the first ammonia gas channel 110 is provided with a first ammonia gas actuator 610, a first ammonia gas flow sensor 710 and a first ammonia gas valve 810, the gas regulating module 400 is respectively connected with the first ammonia gas actuator 610 and the first ammonia gas flow sensor 710, the first ammonia gas actuator 610 is connected with the first ammonia gas valve 810, the second ammonia gas channel 210 is provided with a second ammonia gas actuator 620, a second ammonia gas flow sensor 720 and a second ammonia gas valve 820, the gas regulating module 400 is respectively connected with the second ammonia gas actuator 620 and the second ammonia gas flow sensor 720, and the second ammonia gas actuator 620 is connected with the second ammonia gas valve 820; the first hydrogen channel 120 is provided with a first hydrogen actuator 630, a first hydrogen flow sensor 730 and a first hydrogen valve 830, the gas regulating module 400 is respectively connected with the first hydrogen actuator 630 and the first hydrogen flow sensor 730, the first hydrogen actuator 630 is connected with the first hydrogen valve 830, the second hydrogen channel 220 is provided with a second hydrogen actuator 640, a second hydrogen flow sensor 740 and a second hydrogen valve 840, the gas regulating module 400 is respectively connected with the second hydrogen actuator 640 and the second hydrogen flow sensor 740, and the second hydrogen actuator 640 is connected with the second hydrogen valve 840; the first oxygen channel 130 is provided with a first oxygen actuator 650, a first oxygen flow sensor 750 and a first oxygen valve 850, the gas regulating module 400 is respectively connected with the first oxygen actuator 650 and the first oxygen flow sensor 750, the first oxygen actuator 650 is connected with the first oxygen valve 850, the second oxygen channel 230 is provided with a second oxygen actuator 660, a second oxygen flow sensor 760 and a second oxygen valve 860, the gas regulating module 400 is respectively connected with the second oxygen actuator 660 and the second oxygen flow sensor 760, and the second oxygen actuator 660 is connected with the first oxygen valve 850.
Illustratively, gas regulation module 400 includes a first ammonia controller 410, a second ammonia controller 420, a first hydrogen controller 430, a second hydrogen controller 440, a first oxygen controller 450, and a second oxygen controller 460. First ammonia controller 410 is according to Usa1Signal U detected by the first ammonia gas flow sensor 710fa1Deviation of (Δ U)sa1Calculating a control signal of the first ammonia gas channel 110 through a fuzzy PID control strategy, sending the control signal to the first ammonia gas controller 410, adjusting the opening degree of the corresponding first ammonia valve 810 through the first ammonia gas actuator 610, and adjusting the flow rate of the ammonia gas sent to the burner 300; second ammonia controller 420 according to Usa2Signal U detected by second ammonia flow sensor 720fa2Deviation of (Δ U)sa2Calculating a control signal of the second ammonia channel 210 through a fuzzy PID control strategy, sending the control signal to the second ammonia controller 420, adjusting the opening degree of the corresponding second ammonia valve 820 through a second ammonia actuator 620, and adjusting the flow of ammonia gas sent into the second combustion area 200; first hydrogen controller 430 is according to Ush1Signal U detected by first hydrogen flow sensor 730fh1Deviation of (Δ U)sh1Calculating a control signal of the first hydrogen channel 120 through a fuzzy PID control strategy, sending the control signal to the first hydrogen controller 430, adjusting the opening degree of the corresponding first hydrogen valve 830 through the first hydrogen actuator 630, and adjusting the hydrogen flow sent to the combustor 300; second hydrogen controller 440 according to Ush2Signal U detected by the second hydrogen flow sensor 740fh2Deviation of (Δ U)sh2Calculating a control signal of the second hydrogen channel 220 through a fuzzy PID control strategy, sending the control signal to the second hydrogen controller 440, adjusting the opening degree of the corresponding second hydrogen valve 840 through the second hydrogen actuator 640, and adjusting the hydrogen flow sent into the second combustion area 200; first oxygen controller 450 is according to Uso1Signal U detected by first oxygen flow sensor 750fo1Deviation of (Δ U)so1Calculating a control signal of the first oxygen channel 130 through a fuzzy PID control strategy, sending the control signal to the first oxygen controller 450, adjusting the opening degree of the corresponding first oxygen valve 800 through the first oxygen actuator 650, and adjusting the flow rate of the oxygen sent to the combustor 300; second oxygen controller 460 according to Uso2Signal U detected by second oxygen flow sensor 760fo2Deviation of (Δ U)so2And a control signal of the second oxygen channel 230 is calculated through a fuzzy PID control strategy, sent to the second oxygen controller 460, and adjusted by the second oxygen actuator 660 corresponding to the opening degree of the second oxygen valve 860, so as to adjust the flow rate of the oxygen sent into the second combustion area 200.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. An ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting is characterized by comprising a first combustion area, a second combustion area, a combustor and a gas adjusting module;
the first combustion area and the second combustion area are communicated with each other, the burner is arranged in the first combustion area, and ammonia, hydrogen and oxygen can be introduced into both the burner and the second combustion area;
when the combustor burns, the gas regulating module regulates the flow of ammonia, hydrogen and oxygen which are introduced into the combustor and the second combustion area, so that the combustor is rich in fuel after being introduced into the ammonia, the hydrogen and the oxygen, and the second combustion area is lean in fuel after being introduced into the ammonia, the hydrogen and the oxygen and mixed gas generated by the combustion of the first combustion area.
2. The ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting as claimed in claim 1, wherein the gas regulating module regulates the flow of ammonia, hydrogen and oxygen to the burner and the second combustion area so that K is equal to Ka＝3～5，Kha1＝2％～5％，Kha2＝2％～5％，Ko1＞Ko2；
Wherein, KaDenotes the ratio, K, of the ammonia gas fed to the burner and the ammonia gas fed to the second combustion zoneha1Denotes the ratio of ammonia to hydrogen fed to the burner, Kha2Expressing the ratio of ammonia to hydrogen, K, fed to the second combustion zoneo1Denotes the ratio of the oxygen fed to the burner to the amount of oxygen required for complete combustion of the mixture in the first combustion zone, Ko2Represents the ratio of the oxygen input into the second combustion zone to the amount of oxygen required for complete combustion of the mixture in the second combustion zone.
3. The ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting of claim 2, further comprising a temperature control module;
the temperature control module updates the parameter K output to the gas regulating module according to the firing curve and the firing zone temperaturea，Kha1，Kha2，Ko1，Ko2Controlling the input amount of ammonia, hydrogen and oxygen by the gas regulating module;
the relationship of the input quantities of the ammonia gas, the hydrogen gas and the oxygen gas is as follows:
wherein, Usa1Indicating the ammonia gas input of the burner, Usa2Indicating the ammonia gas input, U, to the second combustion zonesh1Indicating the hydrogen input of the burner, Ush2Indicating the hydrogen input, U, to the second combustion zoneso1Indicating the oxygen input of the burner, Uso2Indicating the oxygen input, U, of the second combustion zoneo1Representing the theoretical oxygen input, U, required for the first combustion zoneo2Representing the theoretical oxygen input required for the second combustion zone.
4. An ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting as claimed in claim 3, wherein the temperature control module comprises a temperature detection unit, a parameter setting unit and a data storage unit;
the temperature detection unit is connected with the parameter setting unit and is used for acquiring temperature information of the ceramic roller kiln; the parameter setting unit is used for outputting a gas proportion control signal to the gas regulating module according to the firing curve, the temperature of the firing zone and the temperature information acquired by the temperature detection unit; the data storage module is used for recording data generated by the temperature detection unit and the parameter setting unit.
5. An ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting as claimed in claim 3 or 4, wherein the temperature control module and the gas regulating module are connected in RS-485 communication mode.
6. The ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting as claimed in claim 1, wherein the gas regulating module calculates the deviation between the set input amount and the actual input amount of ammonia, hydrogen and oxygen respectively, calculates the ammonia flow regulating signal, the hydrogen flow regulating signal and the oxygen flow regulating signal through a fuzzy PID control strategy and outputs the signals to the burner and the second combustion area, so that the actual input amounts of ammonia, hydrogen and oxygen introduced into the burner and the second combustion area are matched with the set input amounts.
7. The ammonia combustion control system based on oxygen enrichment and hydrogen combustion supporting as claimed in claim 6, wherein the combustor is connected with a first ammonia gas channel, a first hydrogen gas channel and a first oxygen gas channel, the upper wall and the lower wall of the inner cavity of the second combustion area are respectively provided with a plurality of ammonia gas inlets, hydrogen gas inlets and oxygen gas inlets, the ammonia gas inlets are connected with a second ammonia gas channel, the hydrogen gas inlets are connected with a second hydrogen gas channel, and the oxygen gas inlets are connected with a second oxygen gas channel;
the first ammonia gas channel is provided with a first ammonia gas actuator, a first ammonia gas flow sensor and a first ammonia gas valve, the gas regulating module is respectively connected with the first ammonia gas actuator and the first ammonia gas flow sensor, the first ammonia gas actuator is connected with the first ammonia gas valve, the second ammonia gas channel is provided with a second ammonia gas actuator, a second ammonia gas flow sensor and a second ammonia gas valve, the gas regulating module is respectively connected with the second ammonia gas actuator and the second ammonia gas flow sensor, and the second ammonia gas actuator is connected with the second ammonia gas valve;
the first hydrogen channel is provided with a first hydrogen actuator, a first hydrogen flow sensor and a first hydrogen valve, the gas regulating module is respectively connected with the first hydrogen actuator and the first hydrogen flow sensor, the first hydrogen actuator is connected with the first hydrogen valve, the second hydrogen channel is provided with a second hydrogen actuator, a second hydrogen flow sensor and a second hydrogen valve, the gas regulating module is respectively connected with the second hydrogen actuator and the second hydrogen flow sensor, and the second hydrogen actuator is connected with the second hydrogen valve;
the first oxygen channel is provided with a first oxygen actuator, a first oxygen flow sensor and a first oxygen valve, the gas regulating module is respectively connected with the first oxygen actuator and the first oxygen flow sensor, the first oxygen actuator is connected with the first oxygen valve, the second oxygen channel is provided with a second oxygen actuator, a second oxygen flow sensor and a second oxygen valve, the gas regulating module is respectively connected with the second oxygen actuator and the second oxygen flow sensor, and the second oxygen actuator is connected with the first oxygen valve.
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