CN211012447U - Decomposing furnace - Google Patents
Decomposing furnace Download PDFInfo
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- CN211012447U CN211012447U CN201922116065.3U CN201922116065U CN211012447U CN 211012447 U CN211012447 U CN 211012447U CN 201922116065 U CN201922116065 U CN 201922116065U CN 211012447 U CN211012447 U CN 211012447U
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Abstract
The utility model provides a decomposing furnace, which comprises a furnace body, wherein a cone with a downward arranged tip part is constructed at the bottom of the furnace body, the cone is communicated with a smoke chamber positioned at the tail of a rotary kiln and is close to a tertiary air pipe which is communicated with the cone and arranged on the furnace body; the furnace body is provided with a discharging pipe for conveying material powder into the furnace body, and the discharging pipe comprises two third-level discharging pipes which are communicated with the furnace body and are arranged close to the tertiary air pipe, and two fourth-level discharging pipes which are communicated with the smoke chamber; the decomposing furnace also comprises two first coal injection nozzles which are communicated with the bottom of the cone and are oppositely arranged, and a second coal injection nozzle which is communicated with the smoke chamber. The decomposing furnace can improve the combustion sufficiency in the decomposing furnace, and can reduce the emission of nitrogen oxides in the flue gas.
Description
Technical Field
The utility model relates to a cement manufacture equipment technical field, in particular to decomposing furnace.
Background
In the prior art, a decomposing furnace is generally used for staged combustion, which means fuel staged combustion, and conventionally, a reduction combustion area is established between a smoke chamber and the decomposing furnace, a part of fuel for the decomposing furnace is uniformly distributed in the area, a strong reduction area, a weak reduction area and a complete combustion area are formed in the decomposing furnace, NOx formed in the furnace is sufficiently reduced to pollution-free N2, and reduction control is performed on the NOx of the fuel in the decomposing furnace<1) NOx meets CHi(i ═ 1,2,3,4), incompletely combusted products CO, C and incompletely combusted intermediate HCN groups, CHiWhen the group is used, the group is reduced to N2.
Studies have shown that the level of NOx reduction in a decomposing furnace during cement production depends on:
1) decomposition furnace temperature (especially combustion temperature in the initial zone);
2) the type of fuel and the volatiles and nitrogen contained therein;
3) the NOx content of the gases entering the decomposition furnace;
4) air ratio, particularly the air ratio of the initial combustion zone.
Due to the unreasonable arrangement of the decomposing furnace, nitrogen oxides in the flue gas discharged from the top of the decomposing furnace easily exceed the specified standards, thereby polluting the environment.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to a decomposition furnace for reducing the content of nitrogen oxides in flue gas discharged from the decomposition furnace.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
the utility model provides a decomposing furnace, includes the furnace body, in the bottom of furnace body is constructed and is had the tip cone of arranging down, the cone sets up with the smoke chamber intercommunication that is located the rotary kiln tail, decomposing furnace still includes:
the tertiary air pipe is close to the cone and is communicated with the furnace body so as to convey air into the furnace body;
the discharging pipe is arranged to convey material powder into the furnace body and comprises two three-level discharging pipes which are communicated with the furnace body and are arranged close to the tertiary air pipe and two four-level discharging pipes which are communicated with the smoke chamber; the two three-stage discharging pipes are oppositely arranged on the furnace body, and one of the three-stage discharging pipes is positioned right above the tertiary air pipe;
and the coal injection nozzles comprise two first coal injection nozzles which are communicated and arranged at the bottom of the cone and are oppositely arranged, and a second coal injection nozzle which is communicated and arranged on the smoke chamber so as to inject coal powder into the furnace body or the smoke chamber.
Furthermore, the other tertiary discharging pipe and the tertiary air pipe are located at the same height, which is equivalent to the tertiary discharging pipe located above the tertiary air pipe.
Furthermore, the included angle between the spraying direction of the first coal spraying nozzle and the height direction of the furnace body is α, and α is more than or equal to 10 degrees and less than or equal to 20 degrees.
Further, the second coal injection nozzle is arranged on the other side of the smoke chamber relative to one side communicated with the rotary kiln.
Furthermore, the two four-stage blanking pipes are respectively arranged at two sides of the second coal injection nozzle.
Furthermore, a main coal conveying pipe for conveying pulverized coal is arranged outside the furnace body, branch coal conveying pipes are respectively communicated between the main coal conveying pipe and the second coal injection nozzle and between the second coal injection nozzle and the two first coal injection nozzles, the coal inlet ends of the branch coal conveying pipes are converged at one position, and a distributor which is positioned at the converged position and used for distributing the proportion of the pulverized coal entering the branch coal conveying pipes is arranged on the main coal conveying pipe.
Furthermore, the opening degree of the valve arranged on the distributor corresponding to each first coal injection nozzle is more than 60% and less than 100%.
Further, the opening degree of a valve arranged on the distributor corresponding to the second coal injection nozzle is more than 60% and less than 80%.
Furthermore, the smoke chamber is in an L shape, the top end of the smoke chamber is connected with the cone, the bottom end of the smoke chamber is connected with the rotary kiln, the bottom of the other side of the smoke chamber is obliquely arranged relative to the side connected with the rotary kiln, the bottom of the other side of the smoke chamber is obliquely arranged, and the second coal injection nozzle is positioned above the oblique section of the smoke chamber.
Further, the ratio of the cross-sectional area of the smoking chamber to the cross-sectional area of the tip of the cone is greater than 0.4 and less than 0.6.
Compared with the prior art, the utility model discloses following advantage has:
(1) decomposing furnace, through with the tertiary unloading pipe setting of one of them in the top of cubic tuber pipe, can improve the abundant of burning in the decomposing furnace, and nitrogen oxide's emission in the reducible flue gas. And through setting up the second coal injection mouth, can make the air current of burning in the smoke chamber better in the hierarchical burning effect behind the cone, and then reach the purpose that reduces nitrogen oxide content in the flue gas. In addition, the two first coal injection nozzles arranged at the bottom of the cone can also form a weak reduction area, so that the staged combustion effect in the decomposing furnace is facilitated.
(2) The setting of another tertiary unloading pipe position not only does benefit to the interactive effect who improves between air and the material powder, still does benefit to and protects the cone structure.
(3) The setting of first coal injection nozzle blowout direction, the combustion efficiency of buggy is fast, and the reduction efficiency of nitric oxide is the highest, is favorable to corresponding the position to form strong reduction region, further improves the combustion efficiency of buggy, reduces the content of nitrogen oxide in the flue gas.
(4) The arrangement of the position of the second coal injection nozzle can improve the staged combustion effect in the furnace body and improve the overall combustion effect of the pulverized coal.
(5) The arrangement mode of the four-stage blanking pipe and the second coal injection nozzle can be used for combustion by means of the temperature of the smoke chamber, and the four-stage blanking pipe has a good combustion effect.
(6) The spraying amount of the coal dust in the three coal injection nozzles is distributed through the distributor, so that the coal injection nozzles have good distribution and combustion effects, and the distributor is mature in product, easy to purchase and good in using effect.
(7) The setting of valve aperture can ensure the combustion effect of material powder, reduces the content of nitrogen oxide in the flue gas.
(8) Through the shape that sets up the smoke chamber, can form the columnar region in the below of cone, the flue gas of the indoor burning of smoke can be smooth and easy flows into the cone, and then upwards the spouting burning.
(9) The ratio of the cross-sectional area of the smoke chamber to the cross-sectional area of the top end of the cone enables the coal powder and the smoke to flow in a turbulent manner, a spouting effect is formed, and the staged combustion effect is improved.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
FIG. 1 is a schematic structural view of a decomposition furnace according to an embodiment of the present invention at an angle;
FIG. 2 is a schematic structural view of a decomposition furnace according to an embodiment of the present invention at another angle;
description of reference numerals:
1-furnace body, 101-cone, 2-three-level blanking pipe, 3-three-time air pipe, 4-first coal injection nozzle, 5-rotary kiln, 6-smoke chamber, 7-second coal injection nozzle and 8-four-level blanking pipe.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The present embodiment relates to a decomposing furnace, as shown in fig. 1 and fig. 2, the decomposing furnace includes a furnace body 1, a cone 101 with a downward tip is configured at the bottom of the furnace body 1, the cone 101 is disposed to communicate with a smoke chamber 6 at the tail end of a rotary kiln 5, wherein the smoke chamber 6 is in a shape of "L", the top end of the smoke chamber 6 is connected with the cone 101, the bottom end of the smoke chamber 6 is connected with the rotary kiln 5, the bottom of the other side of the smoke chamber 6 is disposed to be inclined relative to the side connected with the rotary kiln 5, so that a columnar area can be formed below the cone 101, smoke combusted in the smoke chamber 6 can smoothly flow into the cone 101, and then spurt upwards.
With continued reference to fig. 1 and 2, a tertiary air duct 3 provided on the furnace body 1 is communicated in proximity to the cone 101, the tertiary air duct 3 being used to convey air into the furnace body 1. The furnace body 1 is provided with a blanking pipe for conveying raw material powder into the furnace body 1, the blanking pipe mainly conveys raw material powder, and the blanking pipe comprises two three-level blanking pipes 2 which are communicated with each other and arranged on the furnace body 1 and close to the tertiary air pipe 3, and two four-level blanking pipes 8 which are communicated with the smoke chamber 6. Wherein, two tertiary unloading pipe 2 are arranged on furnace body 1 relatively, and one tertiary unloading pipe 2 is located the tertiary tuber pipe 3 directly over, and another tertiary unloading pipe 2 is located the same height with tertiary tuber pipe 3. The cone 101 structure is beneficial to improving the interaction effect between air and material powder and protecting the cone 101 structure.
The decomposing furnace also comprises a coal injection nozzle, specifically, the coal injection nozzle comprises two first coal injection nozzles 4 which are communicated and arranged at the bottom of the cone 101 and are oppositely arranged, and a second coal injection nozzle 7 which is communicated and arranged on the smoke chamber 6 so as to inject coal powder into the corresponding furnace body 1 or the smoke chamber 6, wherein the included angle between the spraying direction of the first coal injection nozzles 4 and the height direction of the furnace body 1 is α, α is more than or equal to 10 degrees and less than or equal to 20 degrees, for example α can be 15 degrees, the combustion efficiency is fastest in the angle range, the reduction efficiency of nitric oxide is highest, a strong reduction area can be formed at the corresponding position, the combustion efficiency is further improved, and the content of nitrogen oxides in smoke is reduced.
For one side of the communicating rotary kiln 5, the second coal injection nozzle 7 is arranged at the other side of the smoke chamber 6, particularly above the inclined part of the smoke chamber 6, so that the staged combustion effect of the material powder can be improved, and the overall combustion effect of the material powder is improved. As shown in fig. 2, two quaternary blanking pipes 8 are disposed at both sides of the second coal injection nozzle 7 to enable combustion by means of the temperature of the smoke chamber 6 and have a good combustion effect.
In this embodiment, in order to improve the effect of each coal injection nozzle when in use and improve the staged combustion efficiency, a main coal conveying pipe for conveying pulverized coal is arranged outside the furnace body 1, and branch coal conveying pipes are respectively communicated between the main coal conveying pipe and the second coal injection nozzle 7 and between the two first coal injection nozzles 4. The coal feeding ends of the three branch coal conveying pipes are converged at one position, and a distributor which is positioned at the converging position and used for distributing the proportion of the coal dust entering each branch coal conveying pipe is arranged on the main coal conveying pipe. The distributor is specifically a pulverized coal distributor in the prior art, the pulverized coal distributor is internally provided with a baffle plate arranged corresponding to each coal conveying pipe, the baffle plate has the function of adjusting the communication state between the main coal conveying pipe and each corresponding coal conveying pipe, the structure is mature, the purchase is convenient, and the using effect is good.
Through repeated experiments of the inventor, the opening degree of the valve arranged on the distributor corresponding to each first coal injection nozzle 4 is more than 60% and less than 100%, and if the opening degree of the valve is 80%, the combustion effect can be ensured, and the content of nitrogen oxides in the flue gas can be reduced. The opening degree of a valve arranged on the distributor corresponding to the second coal injection nozzle 7 is more than 60% and less than 80%, and if the opening degree is 70%, the combustion effect of the material powder can be ensured, and the content of nitrogen oxides in the flue gas is reduced. And when the opening degrees of the two valves are both in the corresponding ranges, the two valves are combined with each other to achieve the best use effect. The valve in this embodiment is specifically a gate valve, which may adopt a structure of the prior art, and is not described in detail herein.
Referring to fig. 1, in the embodiment, the ratio of the cross-sectional area of the smoke chamber 6 to the cross-sectional area of the top end of the cone 101 is greater than 0.4 and less than 0.6, for example, the ratio of the cross-sectional area of the smoke chamber to the cross-sectional area of the top end of the cone 101 is 0.5, so that the pulverized coal and the flue gas can flow in a turbulent manner, a spouting effect is formed, and the staged combustion effect is. In addition, according to research, when the temperature is lower than 1300 ℃, the decomposition of nitrogen oxides can be accelerated, so that the temperature in the smoke chamber 6 is controlled to be 1050-1180 ℃ so as to improve the staged combustion efficiency.
In addition, when the decomposing furnace in the embodiment is used, the distance between the tertiary air pipe 3 and the first coal injection nozzle 4 can be increased, so that the volume of a reduction area is increased, the staged combustion time is prolonged, and the full combustion of pulverized coal is facilitated to form a burnout area. In addition, in this embodiment, the gas analyzer can be installed on the smoke chamber 6 to detect the oxygen content in the smoke chamber 6, and the oxygen content at the outlet of the preheater is controlled to be lower than 3%, so that air is reasonably distributed into the furnace body 1, the overall air consumption is reduced, and the staged combustion efficiency can be effectively improved. Simultaneously, the gas analyzer still can detect the content of carbon monoxide, and carbon monoxide concentration through controlling the preheater exit is at 400 ~ 800ppm, also can reach better whole denitration effect.
In addition, by applying the technical scheme, the emission concentration of nitrogen oxides in the flue gas is less than 50mg/Nm3Compared with the original discharge concentration of 100mg/Nm3The air quantity of the system standard condition is reduced by 50mg, the air quantity is about 48 ten thousand m3/h, the emission of nitrogen oxides is reduced by 48 × 104 × 50 × 10-6-24 kg per hour, the emission concentration is lower than 50% of the national standard, the environmental protection tax is reduced by half and collected, and the environmental protection tax payment is reduced by 24 ÷ 0.95 × 2.4.4 2.4 × 24-1455.16 yuan per day because the nitrogen oxides are equivalent by 2.4 yuan.
According to the decomposing furnace, the tertiary discharging pipe 2 is arranged above the tertiary air pipe 3, so that the combustion sufficiency in the decomposing furnace can be improved, and the emission of nitrogen oxides in smoke can be reduced. And through setting up second coal injection nozzle 7, can make the hierarchical combustion effect of the air current of burning in smoke chamber 6 better after the cone 101, and then reach the purpose that reduces nitrogen oxide content in the flue gas. In addition, the two first coal injection nozzles 4 arranged at the bottom of the cone 101 can also form a weak reduction area, which is beneficial to the staged combustion effect in the decomposing furnace.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a decomposing furnace, its characterized in that, includes furnace body (1), in the bottom of furnace body (1) is constructed tip cone (101) of arranging downwards, cone (101) and smoke chamber (6) intercommunication setting that are located rotary kiln (5) kiln tail, decomposing furnace still includes:
the tertiary air pipe (3) is close to the cone (101) and is communicated with the furnace body (1) so as to convey air into the furnace body (1);
the discharging pipe is arranged to convey powder into the furnace body (1), and comprises two three-stage discharging pipes (2) which are communicated with the furnace body (1) and are arranged close to the tertiary air pipe (3), and two four-stage discharging pipes (8) which are communicated with the smoke chamber (6); the two three-stage discharging pipes (2) are oppositely arranged on the furnace body (1), and one of the three-stage discharging pipes (2) is positioned right above the tertiary air pipe (3);
the coal injection nozzle comprises two first coal injection nozzles (4) which are communicated and arranged at the bottom of the cone (101) and are arranged oppositely, and a second coal injection nozzle (7) which is communicated and arranged on the smoke chamber (6) so as to inject coal powder into the furnace body (1) or the smoke chamber (6).
2. The decomposition furnace according to claim 1, wherein: the other tertiary discharging pipe (2) is located at the same height with the tertiary air pipe (3) and is equivalent to the tertiary discharging pipe (2) located above the tertiary air pipe (3).
3. The decomposing furnace according to claim 1, characterized in that the included angle between the spraying direction of the first coal nozzle (4) and the height direction of the furnace body (1) is α, 10 ° - α ° -20 °.
4. The decomposition furnace according to claim 1, wherein: and the second coal injection nozzle (7) is arranged at the other side of the smoke chamber (6) relative to the side communicated with the rotary kiln (5).
5. The decomposition furnace according to claim 1, wherein: the two four-level blanking pipes (8) are respectively arranged at two sides of the second coal injection nozzle (7).
6. The decomposition furnace according to claim 1, wherein: a main coal conveying pipe for conveying coal dust is arranged outside the furnace body (1), branch coal conveying pipes are respectively communicated between the main coal conveying pipe and the second coal injection nozzle (7) and between the main coal injection pipe and the two first coal injection nozzles (4), the coal inlet ends of the branch coal conveying pipes are converged at one position, and a distributor which is positioned at the convergence position and used for distributing the proportion of the coal dust entering the branch coal conveying pipes is arranged on the main coal conveying pipe.
7. The decomposition furnace according to claim 6, wherein: the opening degree of a valve arranged on the distributor corresponding to each first coal injection nozzle (4) is more than 60% and less than 100%.
8. The decomposition furnace according to claim 6, wherein: the opening degree of a valve arranged on the distributor corresponding to the second coal injection nozzle (7) is more than 60% and less than 80%.
9. The decomposing furnace according to claim 1, characterized in that the smoke chamber (6) is shaped like L, the top end of the smoke chamber is connected with the cone (101), the bottom end of the smoke chamber (6) is connected with the rotary kiln (5), the bottom of the other side of the smoke chamber (6) is arranged obliquely relative to the side connected with the rotary kiln (5), and the second coal injection nozzle (7) is positioned above the oblique section of the smoke chamber (6).
10. The decomposition furnace according to any one of claims 1 to 9, wherein: the ratio of the cross-sectional area of the smoke chamber (6) to the cross-sectional area of the top end of the cone (101) is greater than 0.4 and less than 0.6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922116065.3U CN211012447U (en) | 2019-11-29 | 2019-11-29 | Decomposing furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922116065.3U CN211012447U (en) | 2019-11-29 | 2019-11-29 | Decomposing furnace |
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| CN211012447U true CN211012447U (en) | 2020-07-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595096A (en) * | 2020-12-04 | 2021-04-02 | 贵州省鑫瀚蓝环保科技有限公司 | Denitrification combustion method for cement kiln production |
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2019
- 2019-11-29 CN CN201922116065.3U patent/CN211012447U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112595096A (en) * | 2020-12-04 | 2021-04-02 | 贵州省鑫瀚蓝环保科技有限公司 | Denitrification combustion method for cement kiln production |
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