CN216079821U - Improved structure of kiln tail coal injection pipe for disposing polluted soil - Google Patents
Improved structure of kiln tail coal injection pipe for disposing polluted soil Download PDFInfo
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- CN216079821U CN216079821U CN202122091109.9U CN202122091109U CN216079821U CN 216079821 U CN216079821 U CN 216079821U CN 202122091109 U CN202122091109 U CN 202122091109U CN 216079821 U CN216079821 U CN 216079821U
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Abstract
The utility model discloses an improved structure of a kiln tail coal injection pipe for disposing polluted soil, which comprises a main support pipe, a coal powder sleeve and a combustion-supporting air pipe, wherein a central air pipe, a coal air pipe, a rotational flow air pipe and an axial flow air pipe are sequentially arranged on the outer part of the left side of the main support pipe from inside to outside, a central air passage, a coal air passage, a rotational flow air passage and an axial flow air passage are correspondingly and sequentially formed, and a diesel ignition passage is formed in the main support pipe; a flame collecting cover is arranged at the end part of the axial flow air pipe at the outlet of the axial flow air channel; a pulverized coal sleeve is arranged outside the right side of the main supporting pipe, a channel formed in the pulverized coal sleeve is communicated with the coal air channel, and a channel communicated with the central air channel is formed between the pulverized coal sleeve and the main supporting pipe; two sub air pipes of the combustion-supporting air pipe are respectively communicated with the axial flow air channel and the rotational flow air channel; the combustion-supporting air pipe is also communicated with the central air channel through an air distribution hose. The utility model can meet the process requirement of disposing the polluted soil, can adjust the shape and the length of the flame, and ensures that the shape of the flame is stable and powerful.
Description
Technical Field
The utility model belongs to the technical field of mass treatment of polluted soil in cement kilns, and particularly relates to an improved structure of a kiln tail coal injection pipe for treating the polluted soil.
Background
When the existing cement kiln is adopted to treat polluted soil on a large scale, an online decomposing furnace is used, smoke and tertiary air which are reduced at the kiln tail are intensively mixed, so that a strong spouting effect and a turbulence effect are caused, kiln tail flame is greatly influenced, especially, the kiln tail smoke moves from bottom to top, obvious radial shear force is generated on the kiln tail flame, flame dispersion and even flameout are caused, and the flame stability is greatly reduced.
The method is limited by treatment process conditions, the temperature in front of the kiln is low, the temperature of secondary air is low and is only 400 ℃, the flame black fire head in front of the kiln is long, and the pulverized coal is in an incomplete combustion site. Meanwhile, the oxygen content of flue gas generated after pulverized coal combustion is lower, about 2%, and after entering the decomposing furnace, the oxygen amount required by the combustion of kiln tail pulverized coal cannot be met, so that flame extinction is caused.
Meanwhile, the currently used kiln tail coal injection pipe is used in a clinker calcining process in design, pulverized coal is mainly scattered and is fully mixed with materials for heat exchange, the pulverized coal is scattered in the period of disposing polluted soil, diesel flame is branched and even flameout, a certain effect is achieved by adjusting the relative position of a diesel gun and a pulverized coal channel, but the kiln tail flameout is caused because the defects of the coal injection pipe cannot be fundamentally overcome.
The flame stability of the decomposing furnace is poor in the process of treating the polluted soil, the flameout phenomenon frequently occurs, the stable operation of the system is influenced, and even the standard discharge of pollutants is influenced (the denitration and desulfurization efficiency is greatly reduced due to the temperature reduction during flameout, and NOx and SO are reduced3Abnormally elevated emissions).
Disclosure of Invention
The utility model provides an improved structure of a kiln tail coal injection pipe for disposing polluted soil, which can meet the process requirement of disposing the polluted soil, can adjust the shape and the length of flame, and ensures that the shape of the flame is stable and powerful.
The technical scheme adopted by the utility model for solving the technical problems in the prior art is as follows:
an improved structure of a kiln tail coal injection pipe for disposing polluted soil comprises a main support pipe, a coal powder sleeve and a combustion-supporting air pipe, wherein a central air pipe, a coal air pipe, a rotational flow air pipe and an axial flow air pipe are sequentially arranged on the outer portion of the left side of the main support pipe from inside to outside to form a burner head, a diesel ignition channel is formed in the main support pipe, a central air channel is formed between the main support pipe and the central air pipe, a coal air channel is formed between the central air pipe and the coal air pipe, a rotational flow air channel is formed between the coal air pipe and the rotational flow air pipe, and an axial flow air channel is formed between the rotational flow air pipe and the axial flow air pipe;
the diesel ignition channel is used for being inserted into a diesel atomization spray gun, a flame stabilizer is arranged at the outlet of the central air channel, and the flame stabilizer is used for enabling central air to contract to adjust the thickness of flame; the coal air of the coal air channel is used for conveying coal powder, and the coal air comes from the air of a Roots blower of the coal mill; the outlet of the cyclone air channel is provided with a cyclone which forms cyclone air, and the cyclone air is used for rotationally scattering the pulverized coal in a certain direction so as to atomize and fully combust the pulverized coal; the axial flow air of the axial flow air channel is direct flow air, a flame gathering cover for gathering and diffusing flame is arranged at the end part of the axial flow air pipe at the outlet of the axial flow air channel, and the flame gathering cover is of an inward contraction type structure;
a pulverized coal sleeve is arranged outside the right side of the main supporting pipe, a channel formed in the pulverized coal sleeve is communicated with a coal air channel, a pulverized coal inlet is formed in the position, obliquely upwards against the conveying direction of pulverized coal, above the pulverized coal sleeve, and a channel communicated with the central air channel is formed between the pulverized coal sleeve and the main supporting pipe;
the two sub air pipes of the combustion-supporting air pipe are respectively communicated with the axial flow air channel and the rotational flow air channel and are used for providing oxygen for pulverized coal combustion; and the combustion-supporting air pipe is also communicated with the central air channel through an air distribution hose.
In the above technical scheme, preferably, the flame stabilizer is composed of a heat-resistant steel plate, and small holes are uniformly distributed on the steel plate.
In the above technical solution, preferably, an included angle between the pulverized coal inlet and the horizontal direction is 15 °.
In the above technical solution, preferably, the air distribution hose is made of metal.
In the above technical solution, preferably, the two sub-air ducts of the combustion-supporting air duct are arranged in opposite directions.
The utility model has the advantages and positive effects that:
because the utility model adopts a brand-new technical scheme,
according to the utility model, the kiln tail coal injection pipe is redesigned according to the process requirement of disposing polluted soil, the coal injection pipe adopts a multi-channel design, a flame gathering cover is additionally arranged, the divergent fire pattern is gathered, the shape and the length of the flame are adjusted, axial flow wind and rotational flow wind are additionally arranged, the stable and powerful shape of the flame is ensured, and the thickness of the flame is adjusted by the contraction of central wind. Meanwhile, the diesel oil atomization spray gun of the diesel oil ignition channel is combined, the diesel oil atomization effect is improved, the diesel oil is fully combusted, the oil consumption can be effectively reduced, and the diesel oil atomization spray gun has good practical application value and popularization value.
Drawings
FIG. 1 is a front view of an improved construction of a kiln tail coal injection tube according to a preferred embodiment of the utility model;
FIG. 2 is a side view of an improved construction of a kiln tail coal injection tube according to a preferred embodiment of the utility model;
fig. 3 is a sectional view showing an improved structure of a kiln tail coal injection pipe according to a preferred embodiment of the present invention.
In the figure: 1. a main support tube; 1-1, a diesel ignition channel; 2. a central air duct; 2-1, a central wind channel; 2-2, a flame stabilizer; 2-3, small holes; 3. a coal air duct; 3-1, a coal air channel; 4. a cyclone air pipe; 4-1, a swirling air channel; 4-2, a swirler; 5. an axial flow air duct; 5-1, axial flow wind channel; 6. a flame gathering cover; 7. a pulverized coal casing; 7-1, a coal dust inlet; 8. a combustion-supporting air duct; 8-1, air distributing pipes; 8-2, a wind distribution hose.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
in the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," "fixed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium; there may be communication between the interiors of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 and 2, an embodiment of the present invention provides an improved structure of a kiln tail coal injection pipe for disposing polluted soil, including a main support pipe 1, a pulverized coal casing 7 and a combustion-supporting air pipe 8, wherein a central air pipe 2, a coal air pipe 3, a rotational flow air pipe 4 and an axial flow air pipe 5 are sequentially disposed from inside to outside on the left side of the main support pipe 1 to form a burner head, a diesel ignition channel 1-1 is formed in the main support pipe 1, a central air channel 2-1 is formed between the main support pipe 1 and the central air pipe 2, a coal air channel 3-1 is formed between the central air pipe 2 and the coal air pipe 3, a rotational flow air channel 4-1 is formed between the coal air pipe 3 and the rotational flow air pipe 4, and an axial flow air channel 5-1 is formed between the rotational flow air pipe 4 and the axial flow air pipe 5.
The diesel ignition channel 1-1 is used for being inserted into a diesel atomization spray gun, a flame stabilizer 2-2 is arranged at the outlet of the central air channel 2-1, the flame stabilizer 2-2 is composed of a heat-resistant steel plate, small holes 2-3 are uniformly distributed in the steel plate, and the flame stabilizer 2-2 is used for enabling central air to contract (only a small amount of air passes through) to adjust the flame thickness; the coal air of the coal air channel 3-1 is used for conveying coal powder and is conveyed by the air of a Roots blower of the coal mill; a swirler 4-2 for forming swirling air is arranged at the outlet of the swirling air channel 4-1, and the swirling air is used for rotationally scattering the pulverized coal in a certain direction so as to atomize and fully combust the pulverized coal; the axial flow air of the axial flow air channel 5-1 is direct flow air, the end part of the axial flow air pipe 5 at the outlet of the axial flow air channel 5-1 is provided with a flame gathering cover 6 for gathering and diffusing flame, and the flame gathering cover 6 is of an inner contraction type structure and can gather and diffuse the flame to achieve an ideal flame shape; the axial flow wind and the rotational flow wind ensure the stable and powerful flame shape.
The coal dust collecting device is characterized in that a coal dust sleeve 7 is arranged outside the right side of the main support pipe 1, a channel formed in the coal dust sleeve 7 is communicated with a coal air channel 3-1, a coal dust inlet 7-1 is arranged in an upward inclined position opposite to the conveying direction of coal dust above the coal dust sleeve 7, the included angle between the coal dust inlet 7-1 and the horizontal direction is 15 degrees, and a channel communicated with a central air channel 2-1 is formed between the coal dust sleeve 7 and the main support pipe 1.
Two sub air pipes 8-1 of the combustion-supporting air pipe 8 are respectively communicated with the axial flow air channel 5-1 and the rotational flow air channel 4-1, and the two sub air pipes 8-1 are arranged oppositely and used for providing oxygen for pulverized coal combustion; the combustion-supporting air pipe 8 is also communicated with the central air channel 2-1 through an air distribution hose 8-2 and is used for providing central air for the central air channel 2-1, and the air distribution hose 8-2 is an air distribution hose 8-2 made of metal.
The specific working process of the utility model is as follows:
the diesel oil atomization spray gun is inserted into the diesel oil ignition channel 1-1, pulverized coal is conveyed to the coal air channel 3-1 from the pulverized coal inlet 7-1 by the air of a Roots blower of the coal mill, primary air in the combustion-supporting air pipe 8 respectively enters the axial flow air channel 5-1 and the rotational flow air channel 4-1 through the air distribution pipe 8-1 and enters the central air channel 2-1 through the air distribution hose 8-2; under the action of the flame gathering cover 6, the divergent flame is gathered to achieve an ideal flame shape, the outlet wind speed of the axial flow wind and the rotational flow wind reaches 180-220m/s, the outlet wind speed of the central wind reaches 60m/s, the wind speed of the coal powder reaches 22-18m/s, the rotational flow wind rotationally scatters the coal powder in a certain direction, the coal powder is atomized and fully combusted, and the axial flow wind and the rotational flow wind ensure that the flame shape is stable and powerful.
The kiln tail coal injection pipe adopts a multi-channel design, a flame gathering cover 6 is additionally arranged, a divergent fire pattern is gathered, the shape and the length of flame are adjusted, axial flow wind and rotational flow wind are additionally arranged, the stable and powerful shape of the flame is ensured, and the thickness of the flame is adjusted by the contraction of central wind; meanwhile, the diesel oil atomization spray gun of the diesel oil ignition channel 1-1 is combined, the diesel oil atomization effect is improved, the diesel oil is fully combusted, the process requirement for disposing polluted soil is met, the oil consumption can be effectively reduced, and the diesel oil atomization spray gun has good practical application value and popularization value.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (5)
1. An improved structure of a kiln tail coal injection pipe for disposing polluted soil is characterized in that: the burner comprises a main support pipe, a pulverized coal sleeve and a combustion-supporting air pipe, wherein a central air pipe, a coal air pipe, a rotational flow air pipe and an axial flow air pipe are sequentially arranged outside the left side of the main support pipe from inside to outside to form a burner head, a diesel ignition channel is formed in the main support pipe, a central air channel is formed between the main support pipe and the central air pipe, a coal air channel is formed between the central air pipe and the coal air pipe, a rotational flow air channel is formed between the coal air pipe and the rotational flow air pipe, and an axial flow air channel is formed between the rotational flow air pipe and the axial flow air pipe;
the diesel ignition channel is used for being inserted into a diesel atomization spray gun, a flame stabilizer is arranged at the outlet of the central air channel, and the flame stabilizer is used for enabling central air to contract to adjust the thickness of flame; the coal air of the coal air channel is used for conveying coal powder, and the coal air comes from the air of a Roots blower of the coal mill; the outlet of the cyclone air channel is provided with a cyclone which forms cyclone air, and the cyclone air is used for rotationally scattering the pulverized coal in a certain direction so as to atomize and fully combust the pulverized coal; the axial flow air of the axial flow air channel is direct flow air, a flame gathering cover for gathering and diffusing flame is arranged at the end part of the axial flow air pipe at the outlet of the axial flow air channel, and the flame gathering cover is of an inward contraction type structure;
a pulverized coal sleeve is arranged outside the right side of the main supporting pipe, a channel formed in the pulverized coal sleeve is communicated with a coal air channel, a pulverized coal inlet is formed in the position, obliquely upwards against the conveying direction of pulverized coal, above the pulverized coal sleeve, and a channel communicated with the central air channel is formed between the pulverized coal sleeve and the main supporting pipe;
the two sub air pipes of the combustion-supporting air pipe are respectively communicated with the axial flow air channel and the rotational flow air channel and are used for providing oxygen for pulverized coal combustion; and the combustion-supporting air pipe is also communicated with the central air channel through an air distribution hose.
2. The improved structure of the kiln tail coal injection pipe for disposing polluted soil as claimed in claim 1, wherein: the flame stabilizer is composed of a heat-resistant steel plate, and small holes are uniformly distributed in the steel plate.
3. The improved structure of the kiln tail coal injection pipe for disposing polluted soil as claimed in claim 1, wherein: the coal powder inlet and the horizontal direction form an included angle of 15 degrees.
4. The improved structure of the kiln tail coal injection pipe for disposing polluted soil as claimed in claim 1, wherein: the air distribution hose is made of metal.
5. The improved structure of the kiln tail coal injection pipe for disposing polluted soil as claimed in claim 1, wherein: the two air distribution pipes of the combustion-supporting air pipe are arranged oppositely.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122091109.9U CN216079821U (en) | 2021-08-31 | 2021-08-31 | Improved structure of kiln tail coal injection pipe for disposing polluted soil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122091109.9U CN216079821U (en) | 2021-08-31 | 2021-08-31 | Improved structure of kiln tail coal injection pipe for disposing polluted soil |
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| CN216079821U true CN216079821U (en) | 2022-03-18 |
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| CN202122091109.9U Active CN216079821U (en) | 2021-08-31 | 2021-08-31 | Improved structure of kiln tail coal injection pipe for disposing polluted soil |
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