CN216977558U - Nitrogen oxide reduction furnace for cement production - Google Patents
Nitrogen oxide reduction furnace for cement production Download PDFInfo
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- CN216977558U CN216977558U CN202220239553.2U CN202220239553U CN216977558U CN 216977558 U CN216977558 U CN 216977558U CN 202220239553 U CN202220239553 U CN 202220239553U CN 216977558 U CN216977558 U CN 216977558U
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Abstract
The utility model relates to the technical field of cement production equipment, and provides a nitrogen oxide reduction furnace for cement production, which comprises: a reduction furnace body; the reduction furnace body comprises a reduction zone flue, the axis of the reduction zone flue is vertical to the horizontal plane, and the projection shape of the reduction zone flue on the horizontal plane is rectangular; the reduction zone flue comprises an air inlet and an air outlet, the air inlet and the air outlet are respectively arranged at two ends of the reduction zone flue, and the air inlet is positioned at the lower side of the air outlet; the air inlet is communicated with the rotary kiln, and the air outlet is communicated with the fan; the reduction zone flue is provided with a coal powder inlet which is arranged close to the air inlet and communicated with the air inlet. According to the utility model, the reduction efficiency of the nitrogen oxide is improved by arranging the reduction area flue with the rectangular cross section.
Description
Technical Field
The utility model relates to the technical field of cement production equipment, in particular to a nitrogen oxide reduction furnace for cement production.
Background
Pollutants generated in the cement production process mainly include particulate matters, sulfur dioxide and nitrogen oxides, wherein the nitrogen oxides can seriously damage the nervous system and the respiratory system, and therefore, the emission index of the nitrogen oxides needs to be strictly controlled.
The nitrogen oxides generated in the cement production process are mainly removed through a reduction furnace, and the nitrogen oxides and reducing gas are subjected to reduction reaction in the reduction furnace to generate harmless nitrogen, so that the content of the nitrogen oxides is reduced; however, the existing reduction furnace is difficult to perform sufficient reduction reaction on the nitrogen oxides, so that the reduction efficiency of the nitrogen oxides is low, and the emission of the nitrogen oxides is difficult to meet the relevant emission standard.
SUMMERY OF THE UTILITY MODEL
The utility model provides a nitrogen oxide reduction furnace for cement production, which is used for solving or improving the problem that the existing reduction furnace is difficult to realize sufficient and effective reduction reaction on nitrogen oxide.
The utility model provides a nitrogen oxide reduction furnace for cement production, which comprises: the reduction furnace body comprises a reduction zone flue, the axis of the reduction zone flue is vertical to the horizontal plane, and the projection shape of the reduction zone flue on the horizontal plane is rectangular; the reduction zone flue comprises an air inlet and an air outlet, the air inlet and the air outlet are respectively arranged at two ends of the reduction zone flue, and the air inlet is positioned at the lower side of the air outlet; the air inlet is communicated with the rotary kiln, and the air outlet is communicated with the fan; the reduction zone flue is provided with a pulverized coal inlet which is arranged close to the air inlet and communicated with the air inlet.
According to the nitrogen oxide reduction furnace for cement production provided by the utility model, the reduction zone flue is also provided with a raw material inlet, the raw material inlet is arranged close to the air inlet, and the raw material inlet is communicated with the air inlet.
According to the nitrogen oxide reduction furnace for cement production provided by the utility model, two raw material inlets are arranged, and the two raw material inlets are oppositely arranged.
According to the nitrogen oxide reduction furnace for cement production, two pulverized coal inlets are arranged, and the two pulverized coal inlets are oppositely arranged.
According to the nitrogen oxide reduction furnace for cement production, provided by the utility model, the reduction zone flue comprises a first section and a second section; the first end of the first section forms the air outlet, the second end of the first section communicates with the first end of the second section, and the second end of the second section forms the air inlet; wherein the cross-sectional area of the second section decreases from the first end of the second section to the second end of the second section.
According to the utility model, the nitrogen oxide reduction furnace for cement production is provided, and the reduction furnace body further comprises: a combustion zone flue; one end of the combustion area flue is communicated with the air outlet, and the other end of the combustion area flue is communicated with the fan; the combustion area flue is used for being communicated with a tertiary air pipeline.
According to the utility model, the nitrogen oxide reduction furnace for cement production further comprises: a water vapor nozzle; the water vapor spray pipe is communicated with the coal powder inlet.
According to the utility model, the nitrogen oxide reduction furnace for cement production further comprises: a steam generating device; the outlet of the steam generating device is communicated with the water steam spray pipe.
According to the nitrogen oxide reduction furnace for cement production, provided by the utility model, the reduction zone flue with the rectangular cross section is arranged, so that the reduction reaction of nitrogen oxide in waste gas can be fully carried out, and the reduction efficiency of the nitrogen oxide is improved; waste gas in the rotary kiln enters a reduction zone flue from an air inlet, and meanwhile, coal powder is introduced into a coal powder inlet, the coal powder is not fully combusted in the reduction zone flue to generate carbon monoxide, the carbon monoxide reacts with nitrogen oxides to generate carbon dioxide and nitrogen, namely, the nitrogen oxides complete reduction reaction in the reduction zone flue, and as the cross section of the reduction zone flue is rectangular, compared with the circular cross section, the reduction zone flue with the rectangular cross section can reduce the rotational flow of the waste gas, so that the waste gas can vertically rise, the rectification of the waste gas is realized, the flow field of the waste gas in the reduction zone flue is uniform and stable, the nitrogen oxides and the carbon monoxide can be fully contacted and reacted, the reduction efficiency of the nitrogen oxides is improved, and the reduction stability of the nitrogen oxides is improved; meanwhile, the power of the air outlet fan can be properly controlled, so that the flow speed of the waste gas in the reduction zone flue is controlled, the waste gas can stay in the reduction zone flue for a long time, the nitrogen oxide can be subjected to sufficient reduction reaction, and the reduction efficiency of the nitrogen oxide is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a nitrogen oxide reduction furnace for cement production according to the present invention;
FIG. 2 is a cross-sectional view of a reduction zone flue provided by the present invention taken along the direction A-A;
reference numerals are as follows:
1: a reduction furnace body; 11: a reduction zone flue; 111: a pulverized coal inlet; 112: a raw material inlet; 113: a first segment; 114: a second segment; 12: a combustion zone flue; 2: rotating the cellar; 3: a tertiary air duct; 4: a steam nozzle; 5: a steam generating device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention may be understood as specific cases by those of ordinary skill in the art.
The nitrogen oxide reduction furnace for cement production according to the present invention will be described with reference to fig. 1 to 2.
As shown in fig. 1 to 2, the nitrogen oxide reduction furnace for cement production shown in the present embodiment includes: a reduction furnace body 1.
The reduction furnace body 1 comprises a reduction zone flue 11, the axis of the reduction zone flue 11 is vertical to the horizontal plane, and the projection shape of the reduction zone flue 11 on the horizontal plane is rectangular; the reduction zone flue 11 comprises an air inlet and an air outlet, the air inlet and the air outlet are respectively arranged at two ends of the reduction zone flue 11, and the air inlet is positioned at the lower side of the air outlet; the air inlet is communicated with the rotary kiln 2, and the air outlet is communicated with the fan; the reducing area flue 11 is provided with a pulverized coal inlet 111, the pulverized coal inlet 111 is arranged close to the air inlet, and the pulverized coal inlet 111 is communicated with the air inlet.
Specifically, in the embodiment, by arranging the reduction zone flue 11 with a rectangular cross section, the reduction reaction of the nitrogen oxides in the waste gas can be sufficiently performed, and the reduction efficiency of the nitrogen oxides is improved; waste gas in the rotary kiln 2 enters the reduction zone flue 11 from the gas inlet, meanwhile, coal powder is introduced into the coal powder inlet 111, the coal powder is not sufficiently combusted in the reduction zone flue 11 to generate carbon monoxide, the carbon monoxide reacts with nitrogen oxides to generate carbon dioxide and nitrogen, namely, the nitrogen oxides complete reduction reaction in the reduction zone flue 11, because the cross section of the reduction zone flue 11 is rectangular, compared with the circular cross section, the reduction zone flue 11 with the rectangular cross section can reduce the rotational flow of the waste gas, so that the waste gas can vertically rise, rectification of the waste gas is realized, the flow field of the waste gas in the reduction zone flue 11 is uniform and stable, the nitrogen oxides and the carbon monoxide can be sufficiently contacted and reacted, the reduction efficiency of the nitrogen oxides is improved, and the reduction stability of the nitrogen oxides is improved; meanwhile, the power of the fan at the air outlet can be properly controlled, so that the flow speed of the waste gas in the flue of the reduction zone is controlled, the waste gas can stay in the flue of the reduction zone for a long time, for example, the air speed in the flue 11 of the reduction zone is controlled to be 8-10m/s by the fan, the length of the flue 11 of the reduction zone is about 10m, the time for the waste gas to pass through the flue 11 of the reduction zone is longer than 0.8s, the nitrogen oxide can be subjected to a sufficient reduction reaction, and the reduction efficiency of the nitrogen oxide is improved.
In some embodiments, as shown in fig. 1, the reduction zone flue 11 of this embodiment is further provided with a raw material inlet 112, the raw material inlet 112 is disposed adjacent to the air inlet, and the raw material inlet 112 is communicated with the air inlet.
Specifically, when the tertiary air enters the reduction furnace body, a large amount of oxygen is brought in, so that the combustion speed of pulverized coal is too high, local high temperature is easily formed, so that the material is bonded and skinned, and at the moment, a certain amount of cold raw material is input into the reduction zone flue 11 through a raw material inlet to prevent local skinning, wherein the cold raw material is calcium carbonate which is decomposed into calcium oxide and carbon dioxide when meeting high temperature, so that certain heat is absorbed, and the local temperature is reduced.
In a preferred embodiment, as shown in fig. 1, the raw meal inlet 112 of this embodiment is provided with two raw meal inlets 112, and the two raw meal inlets 112 are oppositely arranged, i.e. the two raw meal inlets 112 are respectively arranged at the left and right sides of the axis of the reduction zone flue 11, so that the cold raw meal can uniformly enter the reduction zone flue 11, and the occurrence of the skinning phenomenon is effectively prevented.
In a preferred embodiment, as shown in fig. 1, two pulverized coal inlets 111 are provided in the present embodiment, and the two pulverized coal inlets 111 are disposed oppositely, that is, the two pulverized coal inlets 111 are respectively disposed at the left and right sides of the axis of the reduction zone flue, so that the pulverized coal can uniformly enter the reduction zone flue, and carbon monoxide generated by the pulverized coal can be uniformly distributed in the reduction zone flue 11, thereby realizing a sufficient reaction between carbon monoxide and nitrogen oxide.
In some embodiments, as shown in fig. 1, the reduction zone stack of the present embodiment includes a first segment 113 and a second segment 114; a first end of the first segment 113 forms an air outlet, a second end of the first segment 113 communicates with a first end of the second segment 114, and a second end of the second segment 114 forms an air inlet; wherein the cross-sectional area of the second segment 114 decreases from a first end of the second segment 114 to a second end of the second segment 114.
Specifically, the cross-sectional area of the second segment 114 is gradually reduced from top to bottom, that is, the air inlet is in a necking shape, and a spouting effect is formed at the air inlet by setting the air inlet in the necking shape, that is, the pulverized coal and the cold raw material lag behind the air flow, so that sufficient reaction between carbon monoxide generated by the pulverized coal and nitrogen oxides is ensured, and a local cooling effect of the cold raw material is also ensured; in addition, the size of the air inlet cannot be too large, the air speed at the air inlet is low due to the too large air inlet, and the pulverized coal and cold raw materials are easy to fall into the rotary kiln 2.
In some embodiments, as shown in fig. 1, the reduction furnace body 1 of the present embodiment further includes: a combustion zone flue 12; one end of the combustion area flue 12 is communicated with the air outlet, and the other end of the combustion area flue 12 is communicated with the fan; the combustion zone flue 12 is adapted to communicate with the tertiary air duct 3.
Specifically, the tertiary air pipeline 3 inputs tertiary air into the combustion area flue 12, and the tertiary air brings oxygen required for burning out into the combustion area flue 12, so that the sufficient combustion of the residual carbon monoxide and the pulverized coal which are not completely reacted is realized.
In some embodiments, as shown in fig. 1, the nitrogen oxide reduction furnace for cement production according to the present embodiment further includes: a steam nozzle 4; the steam nozzle 4 is communicated with the pulverized coal inlet 111.
Specifically, coal powder and water vapor generate water gas reaction to generate carbon monoxide and hydrogen, and the carbon monoxide and the hydrogen can reduce nitrogen oxides into nitrogen under the high-temperature condition, so that the reduction efficiency of the nitrogen oxides is improved.
In some embodiments, as shown in fig. 1, the nitrogen oxide reduction furnace for cement production according to the present embodiment further includes: a steam generating device 5; the outlet of the steam generating device 5 is communicated with the water vapor nozzle 4.
Specifically, the water vapor generated by the steam generating device 5 sequentially passes through the outlet and the water vapor nozzle 4 to enter the reduction zone flue 11, wherein the steam generating device 5 can be an electromagnetic steam generator, an electric steam generator or a fuel steam generator.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A nitrogen oxide reduction furnace for cement production, comprising:
the reduction furnace body comprises a reduction zone flue, the axis of the reduction zone flue is vertical to the horizontal plane, and the projection shape of the reduction zone flue on the horizontal plane is rectangular;
the reduction zone flue comprises an air inlet and an air outlet, the air inlet and the air outlet are respectively arranged at two ends of the reduction zone flue, and the air inlet is positioned at the lower side of the air outlet; the air inlet is used for being communicated with the rotary kiln, and the air outlet is used for being communicated with the fan;
the reduction zone flue is provided with a pulverized coal inlet which is arranged close to the air inlet and communicated with the air inlet.
2. The nitrogen oxide reducing furnace for cement production according to claim 1,
and a raw material inlet is also arranged on the reduction zone flue, the raw material inlet is arranged close to the air inlet, and the raw material inlet is communicated with the air inlet.
3. The nitrogen oxide reducing furnace for cement production according to claim 2,
the raw meal inlet is equipped with two, two the raw meal inlet is relative setting.
4. The nitrogen oxide reducing furnace for cement production according to claim 1,
the pulverized coal inlet is provided with two pulverized coal inlets which are oppositely arranged.
5. The nitrogen oxide reducing furnace for cement production according to claim 1,
the reduction zone stack comprises a first segment and a second segment;
the first end of the first section forms the air outlet, the second end of the first section communicates with the first end of the second section, and the second end of the second section forms the air inlet;
wherein the cross-sectional area of the second section decreases from the first end of the second section to the second end of the second section.
6. The nitrogen oxide reducing furnace for cement production according to claim 1,
the reducing furnace body further comprises: a combustion zone flue;
one end of the combustion area flue is communicated with the air outlet, and the other end of the combustion area flue is communicated with the fan; the combustion area flue is used for being communicated with a tertiary air pipeline.
7. The nitrogen oxide reducing furnace for cement production according to claim 1,
the nitrogen oxide reduction furnace for cement production further comprises: a steam nozzle;
the water vapor spray pipe is communicated with the coal powder inlet.
8. The nitrogen oxide reducing furnace for cement production according to claim 7,
the nitrogen oxide reduction furnace for cement production further comprises: a steam generating device;
the outlet of the steam generating device is communicated with the water steam spray pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202220239553.2U CN216977558U (en) | 2022-01-28 | 2022-01-28 | Nitrogen oxide reduction furnace for cement production |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220239553.2U CN216977558U (en) | 2022-01-28 | 2022-01-28 | Nitrogen oxide reduction furnace for cement production |
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| CN216977558U true CN216977558U (en) | 2022-07-15 |
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| CN202220239553.2U Active CN216977558U (en) | 2022-01-28 | 2022-01-28 | Nitrogen oxide reduction furnace for cement production |
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