CN108267023B - Nitrogen oxide emission control method and device - Google Patents
Nitrogen oxide emission control method and device Download PDFInfo
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- CN108267023B CN108267023B CN201611259145.9A CN201611259145A CN108267023B CN 108267023 B CN108267023 B CN 108267023B CN 201611259145 A CN201611259145 A CN 201611259145A CN 108267023 B CN108267023 B CN 108267023B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
- F27D2019/0012—Monitoring the composition of the atmosphere or of one of their components
Abstract
The embodiment of the invention provides a method and a device for controlling emission of nitrogen oxides, wherein the method comprises the following steps: acquiring the current emission state of nitrogen oxides; acquiring the current alkalinity state of the material; adjusting the proportion of CaO and CaCO in the material according to the current discharge state of the nitrogen oxides, the current alkalinity state of the material and a preset strategy3The proportion of (A) and (B). In the embodiment of the invention, the proportion of CaO and CaCO in the material are adjusted according to the current discharge state of the nitrogen oxide, the current alkalinity state of the material and a preset strategy3The proportion of the flux is changed on the basis of ensuring the alkalinity of the sintering ore, namely, the content of CaO is properly increased and CaCO is reduced by changing the composition proportion of the flux3The content of the (B) can inhibit the generation of nitrogen oxides, not only has low cost, but also does not influence the chemical property of the sinter and ensures the quality of the sinter.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method and a device for controlling emission of nitrogen oxides.
Background
With the rapid development of modern industry, the steel production scale is larger and larger, the energy consumption is more and more, and the energy conservation and environmental protection become important indexes in the steel production. In steel production, iron-containing raw material ores need to be subjected to sintering treatment before entering blast furnace smelting. During sintering, various powdery iron-containing raw materials are mixed with proper amount of fuel and flux, proper amount of water is added, mixed and pelletized to form mixed materials, the mixed materials are uniformly spread on a sintering trolley through a feeding machine and a distributing machine, high-temperature roasting is carried out after ignition, a series of physical and chemical reactions are carried out on the mixed materials, and finally granular materials which are easy to smelt are generated, so that sintered ore is obtained.
During the roasting process of the mixed materials, various pollutants, mainly including dust and SO, are discharged2And NOx (nitrogen oxides), and the like. The inventor finds in the process of implementing the invention that in the prior art, NOx can be treated by a desulfurization and denitrification device at the tail end of a sintering system, but the desulfurization and denitrification cost is quite expensive and high in cost. There has not been an effective method in the prior art to control NOx emissions.
Disclosure of Invention
The invention provides a method and a device for controlling emission of nitrogen oxides, which are used for effectively controlling NOx generated in a sintering process.
According to a first aspect of embodiments of the present invention, there is provided a nitrogen oxide emission control method, the method including:
acquiring the current emission state of nitrogen oxides;
acquiring the current alkalinity state of the material;
adjusting the proportion of CaO and CaCO in the material according to the current discharge state of the nitrogen oxides, the current alkalinity state of the material and a preset strategy3The proportion of (A) and (B).
Optionally, obtaining the current emission state of nitrogen oxides includes:
acquiring a current monitoring value of the concentration of nitrogen oxide in the flue gas;
and determining the current emission state of the nitrogen oxides according to the relation between the current nitrogen oxide concentration monitoring value and a preset emission standard.
Optionally, obtaining the current alkalinity state of the material includes:
acquiring the current alkalinity of the material;
and determining the current alkalinity state of the material according to the relationship between the current alkalinity of the material and a preset alkalinity reference value.
Optionally:
the current emission state of the nitrogen oxides is divided into a first emission state, a second emission state, a third emission state, a fourth emission state and a fifth emission state;
the current alkalinity state of the material is divided into a first alkalinity state, a second alkalinity state, a third alkalinity state, a fourth alkalinity state and a fifth alkalinity state;
adjusting the proportion of CaO and CaCO in the material according to the current discharge state of the nitrogen oxides, the current alkalinity state of the material and a preset strategy3The proportioning of (A) comprises:
inquiring corresponding CaO proportioning adjustment value and CaCO ratio in the preset strategy according to the combination of the current nitrogen oxide emission state and the current alkalinity state of the material3A ratio adjustment value;
adjusting value and CaCO according to inquired CaO proportion3Adjusting the ratio of CaO and CaCO in the material3The proportion of (A) and (B).
Optionally, the preset policy includes:
when the current emission state of the nitrogen oxides is in a first emission state or a second emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is increased by a second preset value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjusting value is the sum of a second preset value and a second specified value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value;
when the current emission state of nitrogen oxides is in a third emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is increased by a second preset value, and the CaCO3The ratio adjustment value is reduced by a fourth preset value(ii) a If the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjusting value is the sum of a second preset value and a second specified value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value;
when the current emission state of nitrogen oxides is in a fourth emission state or a fifth emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is reduced by a second preset value, and the CaCO3The ratio adjustment value is increased by a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjustment value is reduced by a first preset value, and the CaCO3The ratio adjustment value is the sum of the third preset value and the second specified value.
Optionally, the first specified value and the second specified value are determined according to the current value of alkalinity and the alkalinity reference value.
Optionally, adjusting the CaO and CaCO ratio in the material3Before the proportioning, the method further comprises:
correcting the obtained CaO proportioning adjustment value and the CaCO3 proportioning adjustment value according to preset constraint conditions, wherein the preset constraint conditions comprise: adjusted CaO proportion and adjusted CaCO3The mixture ratio of the components is within a preset allowable range.
Optionally, the method further includes:
executing the steps from obtaining the current emission state of the nitrogen oxides to adjusting the proportion of CaO and CaCO in the material every other preset period3The step of proportioning.
According to a second aspect of the embodiments of the present invention, there is provided a nitrogen oxide emission control apparatus, the apparatus including:
the emission state acquisition module is used for acquiring the current emission state of the nitrogen oxides;
the alkalinity state acquisition module is used for acquiring the current alkalinity state of the material;
a ratio adjusting module for adjusting the ratio of CaO and CaCO in the material according to the current discharge state of the nitrogen oxide, the current alkalinity state of the material and a preset strategy3The proportion of (A) and (B).
Optionally, the emission state obtaining module is configured to:
acquiring a current monitoring value of the concentration of nitrogen oxide in the flue gas;
and determining the current emission state of the nitrogen oxides according to the relation between the current nitrogen oxide concentration monitoring value and a preset emission standard.
Optionally, the alkalinity state obtaining module is configured to:
acquiring the current alkalinity of the material;
and determining the current alkalinity state of the material according to the relationship between the current alkalinity of the material and a preset alkalinity reference value.
Optionally:
the current emission state of the nitrogen oxides is divided into a first emission state, a second emission state, a third emission state, a fourth emission state and a fifth emission state;
the current alkalinity state of the material is divided into a first alkalinity state, a second alkalinity state, a third alkalinity state, a fourth alkalinity state and a fifth alkalinity state;
the ratio adjusting module is used for:
inquiring corresponding CaO proportioning adjustment value and CaCO ratio in the preset strategy according to the combination of the current nitrogen oxide emission state and the current alkalinity state of the material3A ratio adjustment value;
adjusting value and CaCO according to inquired CaO proportion3Adjusting the ratio of CaO and CaCO in the material3The proportion of (A) and (B).
Optionally, the preset policy includes:
when the current emission state of the nitrogen oxides is in a first emission state or a second emission state: if the current alkalinity state of the material is at the first alkalinityIn the state or the second alkalinity state, the CaO proportion adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is increased by a second preset value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjusting value is the sum of a second preset value and a second specified value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value;
when the current emission state of nitrogen oxides is in a third emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportioning adjustment value is increased by a second preset value, and the CaCO3 proportioning adjustment value is decreased by a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjusting value is the sum of a second preset value and a second specified value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value;
when the current emission state of nitrogen oxides is in a fourth emission state or a fifth emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is reduced by a second preset value, and the CaCO3The ratio adjustment value is increased by a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjustment value is reduced by a first preset value, and the CaCO3The ratio adjustment value is the sum of the third preset value and the second specified value.
Optionally, the first specified value and the second specified value are determined according to the current value of alkalinity and the alkalinity reference value.
Optionally, the ratio adjusting module is further configured to:
adjusting the obtained CaO proportion and CaCO according to preset constraint conditions3And correcting the ratio adjustment value, wherein the preset constraint condition comprises: adjusted CaO proportion and adjusted CaCO3The mixture ratio of the components is within a preset allowable range.
Optionally, the apparatus further comprises:
a cycle control module for executing the steps from obtaining the current emission state of the nitrogen oxide to adjusting the proportion of CaO and CaCO in the material every other preset period3The step of proportioning.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the proportion of CaO and CaCO in the material are adjusted according to the current discharge state of the nitrogen oxide, the current alkalinity state of the material and a preset strategy3The proportion of the flux is changed on the basis of ensuring the alkalinity of the sintering ore, namely, the content of CaO is properly increased and CaCO is reduced by changing the composition proportion of the flux3The content of the (B) can inhibit the generation of nitrogen oxides, not only has low cost, but also does not influence the chemical property of the sinter and ensures the quality of the sinter.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise. Furthermore, these descriptions should not be construed as limiting the embodiments, wherein elements having the same reference number designation are identified as similar elements throughout the figures, and the drawings are not to scale unless otherwise specified.
FIG. 1 is a schematic view of a sintering pallet shown in accordance with an exemplary embodiment of the present invention;
FIG. 2 is a flow chart illustrating a NOx emission control method in accordance with an exemplary embodiment of the present invention;
FIG. 3 is a flow chart illustrating a NOx emission control method in accordance with an exemplary embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a NOx emission control system in accordance with an exemplary embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a nox emission control apparatus according to an exemplary embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Fig. 1 is a schematic view of a sintering pallet according to an exemplary embodiment of the present invention, in fig. 1, a mixture bunker distributes materials to be sintered on the sintering pallet through a round roller and a nine-roller distributor, the materials move from left to right in the drawing and are combusted under the driving of the sintering pallet, and a plurality of side-by-side windboxes under the sintering pallet can draw flue gas generated in the combustion process out of the sintering pallet.
Fig. 2 is a flowchart illustrating a nox emission control method according to an exemplary embodiment of the present invention. The method can be used for equipment such as single-chip microcomputers, computers, servers and the like as an example.
Referring to fig. 2, the method may include the steps of:
in step S201, the current emission state of nitrogen oxides is obtained.
As an example, obtaining the current emission state of nitrogen oxides may include:
acquiring a current monitoring value of the concentration of nitrogen oxide in the flue gas;
and determining the current emission state of the nitrogen oxides according to the relation between the current nitrogen oxide concentration monitoring value and a preset emission standard.
For example, the preset emission standard for nitrogen oxides NOx may preferably be 300mg/Nm3. By examining the degree to which the monitored value of the current nox concentration deviates from the preset emission standard, the current nox emission state can be classified into five categories, i.e., a first emission state, a second emission state, a third emission state, a fourth emission state, and a fifth emission state. The following table further gives an example of the various emission states:
TABLE 1
And S202, acquiring the current alkalinity state of the material.
As an example, obtaining the current alkalinity state of the material may include:
acquiring the current alkalinity of the material;
and determining the current alkalinity state of the material according to the relationship between the current alkalinity of the material and a preset alkalinity reference value.
For example, the alkalinity reference value may preferably be 1.85.
The embodiment is not limited to how to obtain the alkalinity of the material, and a person skilled in the art can obtain the alkalinity of the material by detecting and calculating according to the prior art.
As an example, in the present embodiment, the current alkalinity state of the material may be classified into a first alkalinity state, a second alkalinity state, a third alkalinity state, a fourth alkalinity state and a fifth alkalinity state according to the relationship between the current alkalinity of the material and the alkalinity reference value, that is, according to the degree of deviation of the current alkalinity of the material from the alkalinity reference value. One example of each alkalinity state is further given in the following table:
TABLE 2
| Alkalinity state classification | Means of | Symbol | Corresponding range |
| First alkalinity state | Too high | UU | >1.92 |
| Second alkalinity state | Height of | U | [1.89,1.92] |
| Third alkalinity state | Reasonable and reasonable | OK | [1.81,1.89) |
| Fourth alkalinity state | Is low in | L | [1.78,1.81) |
| Fifth alkalinity state | Too low | LL | [0,1.75) |
It is easily understood that there may be no sequence between the above steps S201 and S202.
Step S203, adjusting the proportion of CaO and CaCO in the material according to the current discharge state of the nitrogen oxides, the current alkalinity state of the material and a preset strategy3The proportion of (A) and (B).
The embodiment is not limited to the specific content of the preset strategy, and those skilled in the art can select and design according to different requirements/different scenarios, and these choices and designs can be used herein without departing from the spirit and scope of the present invention.
For example, referring to fig. 3, the proportion of CaO and CaCO in the material are adjusted according to the current emission state of nitrogen oxides, the current alkalinity state of the material and a preset strategy3The proportioning of (1) can include:
s301, inquiring a corresponding CaO proportion adjustment value and CaCO in the preset strategy according to the combination of the current nitrogen oxide emission state and the current alkalinity state of the material3And (4) adjusting the ratio.
Step S302, adjusting value and CaCO according to the inquired CaO proportion3Adjusting the ratio of CaO and CaCO in the material3The proportion of (A) and (B).
For example, the preset policy may include:
i) when the current emission state of the nitrogen oxides is in a first emission state or a second emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is increased by a second preset value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjustment value is increased by a second preset value and a second preset valueSum of specified values, said CaCO3The ratio adjustment value is reduced to a fourth preset value;
ii) when the current emission state of nitrogen oxides is in a third emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is increased by a second preset value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjusting value is the sum of a second preset value and a second specified value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value;
iii) when the current emission state of nitrogen oxides is in a fourth emission state or a fifth emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is reduced by a second preset value, and the CaCO3The ratio adjustment value is increased by a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjustment value is reduced by a first preset value, and the CaCO3The ratio adjustment value is the sum of the third preset value and the second specified value.
Wherein, as an example, the first specified value and the second specified value are determined according to the current value of alkalinity and the alkalinity reference value.
For example:
the first specified value may be | (Rx-R0). times.10 |;
the second specified value may be | (Rx-R0). times.10 |/3.
Wherein Rx is the current value of alkalinity and R0 is the baseline value of alkalinity.
The first, second, third and fourth preset values may be 0.1%, 0.2%, 0.3% and 0.6%, respectively.
In addition, in actual production, the proportion of CaO and CaCO are generally3The mixture ratio of the CaO and the CaCO are adjusted within an allowable range (namely, the mixture ratio is restricted)3After the proportioning, the new CaO proportioning and CaCO3The ratio of CaO and CaCO in the material are adjusted in this example3Before the proportioning, the method may further comprise:
adjusting the obtained CaO proportion and CaCO according to preset constraint conditions3And correcting the ratio adjustment value, wherein the preset constraint condition comprises: adjusted CaO proportion and adjusted CaCO3The mixture ratio of the components is within a preset allowable range.
As an example, the preset allowable range of the CaO proportioning can be (0, 5%]，CaCO3The preset allowable range of the mixture ratio of (C) can be (0, 6%]。
In addition, the method can be periodically executed in actual production, that is, the method can further include:
executing the steps from obtaining the current emission state of the nitrogen oxides to adjusting the proportion of CaO and CaCO in the material every other preset period3The step of proportioning.
The preset period may be, for example, 2 hours.
FIG. 4 is a schematic diagram illustrating a NOx emission control system in accordance with an exemplary embodiment of the present invention. In fig. 4, the result of monitoring the flue gas NOx concentration and the emission standard are input to the state determination unit to obtain the emission state of the sintering NOx, and meanwhile, the result of alkalinity monitoring or alkalinity calculation and the base of alkalinity are input to the determination unit of the alkalinity state, the alkalinity state of the sintered ore, and then the emission state of the sintering NOx, the alkalinity state of the sintered ore, and CaO and CaCO3The proportioning constraints are input into a control model (a preset strategy) together, so that the proportioning of CaO and CaCO are obtained3The ratio of (A) should be adjusted to why.
As an example, a specific example of the preset strategy is given in the following table, where Rx is the current value of the alkalinity, R0 is the base value of the alkalinity:
TABLE 3
In the embodiment of the invention, the proportion of CaO and CaCO in the material are adjusted according to the current discharge state of the nitrogen oxide, the current alkalinity state of the material and a preset strategy3The proportion of the flux is changed on the basis of ensuring the alkalinity of the sintering ore, namely, the content of CaO is properly increased and CaCO is reduced by changing the composition proportion of the flux3The content of the (B) can inhibit the generation of nitrogen oxides, not only has low cost, but also does not influence the chemical property of the sinter and ensures the quality of the sinter.
The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details which are not disclosed in the embodiments of the apparatus of the present invention, reference is made to the embodiments of the method of the present invention.
Fig. 5 is a schematic diagram illustrating a nitrogen oxide emission control apparatus according to an exemplary embodiment of the present invention, and referring to fig. 5, the apparatus may include:
an emission state obtaining module 501, configured to obtain a current emission state of nitrogen oxides;
an alkalinity state obtaining module 502, configured to obtain a current alkalinity state of the material;
a proportion adjusting module 503, configured to adjust the proportion of CaO and CaCO in the material according to the current discharge state of the nitrogen oxide, the current alkalinity state of the material, and a preset policy3The proportion of (A) and (B).
In this embodiment or some other embodiments of the present invention, the discharge state acquiring module is configured to:
acquiring a current monitoring value of the concentration of nitrogen oxide in the flue gas;
and determining the current emission state of the nitrogen oxides according to the relation between the current nitrogen oxide concentration monitoring value and a preset emission standard.
In this embodiment or some other embodiments of the present invention, the alkalinity status obtaining module is configured to:
acquiring the current alkalinity of the material;
and determining the current alkalinity state of the material according to the relationship between the current alkalinity of the material and a preset alkalinity reference value.
In this embodiment or some other embodiment of the invention:
the current emission state of the nitrogen oxides is divided into a first emission state, a second emission state, a third emission state, a fourth emission state and a fifth emission state;
the current alkalinity state of the material is divided into a first alkalinity state, a second alkalinity state, a third alkalinity state, a fourth alkalinity state and a fifth alkalinity state;
the ratio adjusting module is used for:
inquiring corresponding CaO proportioning adjustment value and CaCO ratio in the preset strategy according to the combination of the current nitrogen oxide emission state and the current alkalinity state of the material3A ratio adjustment value;
adjusting value and CaCO according to inquired CaO proportion3Adjusting the ratio of CaO and CaCO in the material3The proportion of (A) and (B).
In this embodiment or some other embodiments of the present invention, the preset policy includes:
when the current emission state of the nitrogen oxides is in a first emission state or a second emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is increased by a second preset value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportioning adjustment value is increasedSum of a second predetermined value and a second specified value, CaCO3The ratio adjustment value is reduced to a fourth preset value;
when the current emission state of nitrogen oxides is in a third emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is increased by a second preset value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjusting value is the sum of a second preset value and a second specified value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value;
when the current emission state of nitrogen oxides is in a fourth emission state or a fifth emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is reduced by a second preset value, and the CaCO3The ratio adjustment value is increased by a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjustment value is reduced by a first preset value, and the CaCO3The ratio adjustment value is the sum of the third preset value and the second specified value.
In this or some other embodiments of the invention, the first and second specified values are determined in dependence on the current value of alkalinity and the alkalinity reference value.
In this embodiment or some other embodiments of the present invention, the proportioning adjusting module is further configured to:
adjusting the obtained CaO proportion and CaCO according to preset constraint conditions3And correcting the ratio adjustment value, wherein the preset constraint condition comprises: after adjustmentCaO proportioning and adjusted CaCO3The mixture ratio of the components is within a preset allowable range.
In this embodiment or some other embodiments of the present invention, the apparatus further comprises:
a cycle control module for executing the steps from obtaining the current emission state of the nitrogen oxide to adjusting the proportion of CaO and CaCO in the material every other preset period3The step of proportioning.
In the embodiment of the invention, the proportion of CaO and CaCO in the material are adjusted according to the current discharge state of the nitrogen oxide, the current alkalinity state of the material and a preset strategy3The proportion of the flux is changed on the basis of ensuring the alkalinity of the sintering ore, namely, the content of CaO is properly increased and CaCO is reduced by changing the composition proportion of the flux3The content of the (B) can inhibit the generation of nitrogen oxides, not only has low cost, but also does not influence the chemical property of the sinter and ensures the quality of the sinter.
The specific manner in which each unit \ module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated herein.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (14)
1. A method of nitrogen oxide emission control, the method comprising:
acquiring the current emission state of nitrogen oxides;
acquiring the current alkalinity state of the material;
adjusting the proportion of CaO and CaCO in the material according to the current discharge state of the nitrogen oxides, the current alkalinity state of the material and a preset strategy3Proportioning;
the current emission state of the nitrogen oxides is divided into a first emission state, a second emission state, a third emission state, a fourth emission state and a fifth emission state;
the current alkalinity state of the material is divided into a first alkalinity state, a second alkalinity state, a third alkalinity state, a fourth alkalinity state and a fifth alkalinity state;
adjusting the proportion of CaO and CaCO in the material according to the current discharge state of the nitrogen oxides, the current alkalinity state of the material and a preset strategy3The proportioning of (A) comprises:
inquiring corresponding CaO proportioning adjustment value and CaCO ratio in the preset strategy according to the combination of the current nitrogen oxide emission state and the current alkalinity state of the material3A ratio adjustment value;
adjusting value and CaCO according to inquired CaO proportion3Adjusting the ratio of CaO and CaCO in the material3The proportion of (A) and (B).
2. The method of claim 1, wherein obtaining the current emission status of nitrogen oxides comprises:
acquiring a current monitoring value of the concentration of nitrogen oxide in the flue gas;
and determining the current emission state of the nitrogen oxides according to the relation between the current nitrogen oxide concentration monitoring value and a preset emission standard.
3. The method of claim 1, wherein obtaining the current alkalinity state of the material comprises:
acquiring the current alkalinity of the material;
and determining the current alkalinity state of the material according to the relationship between the current alkalinity of the material and a preset alkalinity reference value.
4. The method of claim 3, wherein the preset policy comprises:
when the current emission state of the nitrogen oxides is in a first emission state or a second emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is increased by a second preset value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjusting value is the sum of a second preset value and a second specified value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value;
when the current emission state of nitrogen oxides is in a third emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is increased by a second preset value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjusting value is the sum of a second preset value and a second specified value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value;
when the current emission state of nitrogen oxides is in a fourth emission state or a fifth emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaThe O ratio is adjusted to reduce the second preset value, the CaCO3The ratio adjustment value is increased by a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjustment value is reduced by a first preset value, and the CaCO3The ratio adjustment value is the sum of the third preset value and the second specified value.
5. The method according to claim 4, wherein the first specified value and the second specified value are determined according to a current value of alkalinity and the alkalinity reference value.
6. The method of claim 1, wherein the CaO and CaCO are adjusted in the material3Before the proportioning, the method further comprises:
adjusting the obtained CaO proportion and CaCO according to preset constraint conditions3And correcting the ratio adjustment value, wherein the preset constraint condition comprises: adjusted CaO proportion and adjusted CaCO3The mixture ratio of the components is within a preset allowable range.
7. The method of claim 1, further comprising:
executing the steps from obtaining the current emission state of the nitrogen oxides to adjusting the proportion of CaO and CaCO in the material every other preset period3The step of proportioning.
8. A nitrogen oxide emission control apparatus, characterized in that the apparatus comprises:
the emission state acquisition module is used for acquiring the current emission state of the nitrogen oxides;
the alkalinity state acquisition module is used for acquiring the current alkalinity state of the material;
a ratio adjusting module for adjusting the ratio of CaO and CaCO in the material according to the current discharge state of the nitrogen oxide, the current alkalinity state of the material and a preset strategy3Proportioning;
the current emission state of the nitrogen oxides is divided into a first emission state, a second emission state, a third emission state, a fourth emission state and a fifth emission state;
the current alkalinity state of the material is divided into a first alkalinity state, a second alkalinity state, a third alkalinity state, a fourth alkalinity state and a fifth alkalinity state;
the ratio adjusting module is used for:
inquiring corresponding CaO proportioning adjustment value and CaCO ratio in the preset strategy according to the combination of the current nitrogen oxide emission state and the current alkalinity state of the material3A ratio adjustment value;
adjusting value and CaCO according to inquired CaO proportion3Adjusting the ratio of CaO and CaCO in the material3The proportion of (A) and (B).
9. The apparatus of claim 8, wherein the discharge status acquisition module is to:
acquiring a current monitoring value of the concentration of nitrogen oxide in the flue gas;
and determining the current emission state of the nitrogen oxides according to the relation between the current nitrogen oxide concentration monitoring value and a preset emission standard.
10. The apparatus of claim 8, wherein the alkalinity status obtaining module is configured to:
acquiring the current alkalinity of the material;
and determining the current alkalinity state of the material according to the relationship between the current alkalinity of the material and a preset alkalinity reference value.
11. The apparatus of claim 10, wherein the preset policy comprises:
when the current emission state of the nitrogen oxides is in a first emission state or a second emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3Proportioning and blendingThe integer value is a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is increased by a second preset value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjusting value is the sum of a second preset value and a second specified value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value;
when the current emission state of nitrogen oxides is in a third emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is increased by a second preset value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjusting value is the sum of a second preset value and a second specified value, and the CaCO3The ratio adjustment value is reduced to a fourth preset value;
when the current emission state of nitrogen oxides is in a fourth emission state or a fifth emission state: if the current alkalinity state of the material is in a first alkalinity state or a second alkalinity state, the CaO proportioning adjustment value is zero, and the CaCO3The ratio adjustment value is decreased by a first designated value; if the current alkalinity state of the material is in a third alkalinity state, the CaO proportion adjustment value is reduced by a second preset value, and the CaCO3The ratio adjustment value is increased by a fourth preset value; if the current alkalinity state of the material is in a fourth alkalinity state or a fifth alkalinity state, the CaO proportion adjustment value is reduced by a first preset value, and the CaCO3The ratio adjustment value is the sum of the third preset value and the second specified value.
12. The apparatus of claim 11, wherein the first specified value and the second specified value are determined according to a current value of alkalinity and the alkalinity reference value.
13. The apparatus of claim 8, wherein the proportioning module is further configured to:
adjusting the obtained CaO proportion and CaCO according to preset constraint conditions3And correcting the ratio adjustment value, wherein the preset constraint condition comprises: adjusted CaO proportion and adjusted CaCO3The mixture ratio of the components is within a preset allowable range.
14. The apparatus of claim 8, further comprising:
a cycle control module for executing the steps from obtaining the current emission state of the nitrogen oxide to adjusting the proportion of CaO and CaCO in the material every other preset period3The step of proportioning.
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