CN113834323A - Rotary kiln gas flow velocity control method - Google Patents
Rotary kiln gas flow velocity control method Download PDFInfo
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- CN113834323A CN113834323A CN202111170765.6A CN202111170765A CN113834323A CN 113834323 A CN113834323 A CN 113834323A CN 202111170765 A CN202111170765 A CN 202111170765A CN 113834323 A CN113834323 A CN 113834323A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/42—Arrangement of controlling, monitoring, alarm or like devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/36—Arrangements of air or gas supply devices
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- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention discloses a rotary kiln gas flow rate control method, which comprises a rotary kiln (1) and a feeding chamber (5) connected with the rotary kiln (1), wherein a tertiary air valve (2) is arranged on the feeding chamber (5), and the flow rate control method comprises the following steps: step one, adding a smoke chamber adjustable valve (3) on a rotary kiln (1); step two, controlling the negative pressure of a kiln tail smoke chamber of the rotary kiln (1) within-600 Pa; step three, monitoring the concentration of carbon monoxide in the rotary kiln (1); regulating the tertiary air valve (2) and the smoke chamber adjustable valve (3) to control the concentration of the nitrogen oxides to be over 800 ppm; the feeding chamber (5) is communicated with a tertiary air pipe (4), and the tertiary air valve (2) is arranged between the tertiary air pipe (4) and the feeding chamber (5). The invention has the advantages of optimizing cement clinker calcination, reducing system resistance and realizing reasonable matching of air-coal materials.
Description
Technical Field
The invention relates to the field of solid waste treatment, in particular to a rotary kiln gas flow rate control method.
Background
The reasonable control of air consumption of the firing system is a key factor influencing high quality and high yield, and is the most important operation means for saving energy, reducing consumption and improving production efficiency. In the cement clinker production, a kiln tail smoke chamber is arranged between the kiln tail of the rotary kiln and the bottom of the decomposing furnace and is used for connecting the rotary kiln and the decomposing furnace, the through-flow cross section area of the kiln tail smoke chamber is determined by the thickness of a casting material at a necking position on the kiln tail smoke chamber, the necking position, a slope, a feeding tongue and the like, and the kiln tail smoke chamber mainly plays a role in connecting the kiln and the decomposing furnace. And meanwhile, a tertiary air pipe is additionally arranged at the bottom of the decomposing furnace, and the tertiary air pipe and the coal powder are combusted in the decomposing furnace to realize the decomposition task of the carbonate.
In order to reasonably match air for the kiln, on one hand, the amount of pulverized coal at the head and the tail of the kiln is adjusted, and on the other hand, the operation of two times and three times is realized by adjusting a tertiary air valve. The matching between the interior of the kiln and the tertiary air is adjusted by adjusting the opening of the tertiary air baffle valve. Because the ventilation area of the necking designed at present is generally small, the tertiary air valve can not be fully opened basically, and the system resistance is large; in addition, in the production process, when flying sand in the clinker is more, the flying sand can be deposited in the tertiary air pipe, and the resistance of tertiary air is increased.
Any adjustment of air is required to keep the ventilation in the kiln smooth, ensure the combustion temperature of the pulverized coal and ensure the air speed in the rotary kiln within a reasonable range.
Under the normal operation condition of the burning system, the gas flow of the rotary kiln and the decomposing furnace simultaneously meets the burning requirement of the fed coal powder.
When the high-temperature fan pulls air unchanged, the high-temperature fan and the high-temperature fan are unbalanced, so that the following results can be obtained: one condition is that kiln wind is too large and tertiary wind amount is insufficient, so that firing temperature is reduced, high temperature moves backwards, kiln tail temperature and negative pressure are increased, tertiary wind temperature and wind speed are reduced, pulverized coal in a furnace is not completely combusted, system temperature is easy to hang upside down, and bonding and blocking are caused in serious cases.
The other condition is that the ventilation in the kiln is insufficient, the tertiary air is excessive, so that the sintering reducing atmosphere is dense, the tail temperature is low, harmful components at the tail of the kiln are enriched and blocked, and the ventilation falls into a vicious circle. Therefore, it is important to adjust the air volume balance of the rotary kiln and the decomposing furnace timely and effectively according to the system operation condition.
In the actual production operation, the process of adjusting the tertiary air has a condition that the tertiary air volume is reduced when the tertiary air valve is closed to be smaller, meanwhile, the ventilation in the kiln is larger, so that the air speed in the kiln is larger, when the air speed is higher than a certain critical value, the raw material powder discharged by C5 is lifted, the internal circulation volume of the material with the decomposition rate is increased, the air speed at the tail of the kiln is increased, the fly ash volume of the rotary kiln is increased, and the fly ash volume in the general kiln is in direct proportion to the power of 2.5-4 of the air speed at the tail of the kiln. The data of the central control DCS is fed back to the negative pressure of the kiln tail smoke chamber to be increased, meanwhile, the pressure of the decomposing furnace is increased, the kiln condition is deteriorated, pulverized coal combustion is not facilitated, the coal consumption and the power consumption of the system are increased indirectly, and the system is difficult to improve the yield.
The current common adjustment modes are as follows: the kiln tail throat adopts a fixed type, and a regulating valve is arranged on the tertiary air pipe. The invention realizes the air matching adjustment for the kiln by changing two means of a tertiary air valve and a smoke chamber necking. The negative pressure of a smoke chamber is strictly controlled in production, the phenomenon that flying dust of the fly ash of the smoke chamber is too large due to too high air speed in the kiln is avoided, through a plurality of field verifications, when the negative pressure of the smoke chamber is-600 Pa, the flying dust at the tail of the kiln is increased, when the negative pressure reaches-800 Pa, the circulating materials in a decomposing furnace are serious, and meanwhile, the negative pressure of the decomposing furnace is also increased correspondingly.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a rotary kiln gas flow velocity control method which optimizes the calcination of cement clinker, reduces the system resistance, realizes the reasonable collocation of air and coal materials and further realizes the reduction of coal consumption and power consumption of a calcination system.
The purpose of the invention is realized by the following technical scheme:
a rotary kiln gas flow rate control method comprises a rotary kiln and a feeding chamber connected with the rotary kiln, wherein a tertiary air valve is arranged on the feeding chamber, and the flow rate control method comprises the following steps:
step one, adding a smoke chamber adjustable valve on a rotary kiln;
step two, controlling the negative pressure of a kiln tail smoke chamber of the rotary kiln within-600 Pa;
monitoring the concentration of carbon monoxide in the rotary kiln;
and step four, adjusting the tertiary air valve and the smoke chamber adjustable valve to control the concentration of the nitrogen oxides to be over 800 ppm.
Furthermore, a tertiary air pipe is communicated with the feeding chamber, and a tertiary air valve is arranged between the tertiary air pipe and the feeding chamber; the smoke chamber adjustable valve is arranged between the rotary kiln and the feeding chamber.
Furthermore, the adjustable valve of the smoking room is an adjustable necking box valve.
Furthermore, when the negative pressure value of the kiln tail smoke chamber is controlled, the air draught of the high-temperature fan is controlled at a stable value, so that the pulverized coal in the rotary kiln is completely combusted, and the increase of the extension resistance caused by a long ring in the kiln is avoided.
Furthermore, the concentration of the carbon monoxide in the rotary kiln is monitored by an online tracking manner through a temperature and pressure gas component sensor.
Further, the temperature and pressure gas composition sensor is installed on the rotary kiln.
Furthermore, when the concentration of the nitrogen oxide is controlled, the flame temperature is firstly increased, and the maximum flame temperature is controlled to be more than 2000 ℃.
Furthermore, the clinker draught stability value is 1.35-1.45 Nm3/kg.sh。
Furthermore, the flame temperature is 1900-2100 ℃.
The invention has the beneficial effects that:
1. the rotary kiln gas flow rate control method provided by the invention takes the control of the air speed in the rotary kiln as a final control target, and the existing tertiary air valve is used for additionally arranging an adjustable smoke chamber necking box valve to adjust the whole air quantity and tracking the negative pressure value, the oxygen content and the nitrogen oxide concentration of a smoke chamber at the tail of a kiln, so that the ventilation in the kiln and the sufficient combustion of coal powder are ensured, the reasonable matching of the air for the kiln is realized, and the production purpose of reducing the coal consumption and the electricity consumption is achieved;
2. compared with the traditional kiln air control scheme, a more specific and quantitative control index is provided, the negative pressure of a kiln tail smoke chamber is ensured to be within a controllable limit value, and the phenomenon that the ash flying amount of the smoke chamber is excessively increased to increase the material internal circulation of the decomposing furnace is avoided;
3. the newly added smoke chamber adjustable throat box valve provides more operation means for air distribution of the kiln on one hand, and on the other hand, compared with the traditional tertiary air valve adjustment scheme, the newly added smoke chamber throat valve is convenient to install, low in manufacturing cost and convenient to adjust and seal;
4. when the abnormal working conditions such as skinning occur, the movable smoke chamber necking valve can be adjusted, and the skinning materials can be conveniently cleaned.
Drawings
Fig. 1 is a schematic view of the structure of a rotary kiln.
In the figure, 1-rotary kiln, 2-tertiary air valve, 3-smoke chamber adjustable valve, 4-tertiary air pipe and 5-feeding chamber.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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 one embodiment, as shown in fig. 1, a method for controlling a gas flow rate of a rotary kiln includes a rotary kiln 1 and a feeding chamber 5 connected to the rotary kiln, where the feeding chamber 5 is provided with a tertiary air valve 2, and the method includes the following steps:
step one, adding a smoke chamber adjustable valve 3 on a rotary kiln 1;
step two, controlling the negative pressure of a kiln tail smoke chamber of the rotary kiln 1 within-600 Pa;
step three, monitoring the concentration of carbon monoxide in the rotary kiln 1;
and step four, adjusting the tertiary air valve 2 and the smoke chamber adjustable valve 3 to control the concentration of the nitrogen oxides to be over 800 ppm.
In the embodiment, the negative pressure of the kiln tail smoke chamber is within-600 Pa, so that the phenomenon that the kiln tail fly ash smoke is brought by overhigh wind speed in the kiln to increase the internal circulation amount of the decomposing furnace material is avoided;
tracking and detecting the concentration CO of carbon monoxide in the kiln, which is one of necessary conditions for ensuring complete combustion of the pulverized coal;
in the process of adjusting the tertiary air valve 2 and the smoke chamber adjustable valve 3, the concentration of nitrogen oxide NOx in the smoke chamber is controlled to be at least over 800ppm, so that high-temperature combustion flame can be formed in the kiln, and the required clinker with qualified quality is calcined by using relatively less heat provided by pulverized coal combustion.
The embodiment is further configured as follows: the feeding chamber 5 is communicated with a tertiary air pipe 4, and the tertiary air valve 2 is arranged between the tertiary air pipe 4 and the feeding chamber 5; the smoke chamber adjustable valve 3 is arranged between the rotary kiln 1 and the feeding chamber 5.
In this embodiment, the sealing rings are installed at the installation ends of the tertiary air valve 2 and the smoke chamber adjustable valve 3.
The embodiment is further configured as follows: the adjustable valve 3 of the smoke chamber is an adjustable necking box valve.
The embodiment is further configured as follows: when the negative pressure value of the kiln tail smoke chamber is controlled, the pulling air of the high-temperature fan is controlled at a stable value to completely burn the pulverized coal in the rotary kiln 1, so that the increase of the extension resistance caused by a long ring in the kiln is avoided. .
The embodiment is further configured as follows: the concentration of the carbon monoxide in the rotary kiln 1 is monitored by an online tracking way through a temperature and pressure gas component sensor.
The embodiment is further configured as follows: the temperature pressure gas composition sensor is installed in the rotary kiln 1.
In this embodiment, the model of the temperature and pressure gas composition sensor is Testo 435.
Realize on-line tracking through temperature pressure gas composition sensor, when data deviate from normal range, well accuse operator can be according to actual conditions aassessment and carry out appropriate adjustment, if carbon monoxide concentration is on the high side, explains that the burning is incomplete, needs to increase the air, improves high temperature fan rotational speed this moment, increases and draws the wind.
The embodiment is further configured as follows: when the concentration of nitrogen oxide is controlled, the flame temperature is firstly increased, and the highest flame temperature is controlled to be more than 2000 ℃.
In the implementation, the stable value of the clinker draught is 1.35Nm 3/kg.sh; the preheater system realizes overall smooth movement by pulling air through the high-temperature fan, namely the overall air volume is constant, the tertiary air brake and the necking air brake are equal to two switches, and the air volume on two sides can be adjusted in a constant flow mode.
In this example, the flame temperature was 1900 ℃.
The second embodiment discloses a rotary kiln gas flow rate control method, which comprises a rotary kiln 1 and a feeding chamber 5 connected with the rotary kiln, wherein a tertiary air valve 2 is arranged on the feeding chamber 5, and the flow rate control method comprises the following steps:
step one, adding a smoke chamber adjustable valve 3 on a rotary kiln 1;
step two, controlling the negative pressure of a kiln tail smoke chamber of the rotary kiln 1 within-600 Pa;
step three, monitoring the concentration of carbon monoxide in the rotary kiln 1;
and step four, adjusting the tertiary air valve 2 and the smoke chamber adjustable valve 3 to control the concentration of the nitrogen oxides to be over 800 ppm.
In the embodiment, the negative pressure of the kiln tail smoke chamber is within-600 Pa, so that the phenomenon that the kiln tail fly ash smoke is brought by overhigh wind speed in the kiln to increase the internal circulation amount of the decomposing furnace material is avoided;
tracking and detecting the concentration CO of carbon monoxide in the kiln, which is one of necessary conditions for ensuring complete combustion of the pulverized coal;
in the process of adjusting the tertiary air valve 2 and the smoke chamber adjustable valve 3, the concentration of nitrogen oxide NOx in the smoke chamber is controlled to be at least over 800ppm, so that high-temperature combustion flame can be formed in the kiln, and the required clinker with qualified quality is calcined by using relatively less heat provided by pulverized coal combustion.
The embodiment is further configured as follows: the feeding chamber 5 is communicated with a tertiary air pipe 4, and the tertiary air valve 2 is arranged between the tertiary air pipe 4 and the feeding chamber 5; the smoke chamber adjustable valve 3 is arranged between the rotary kiln 1 and the feeding chamber 5.
In this embodiment, the sealing rings are installed at the installation ends of the tertiary air valve 2 and the smoke chamber adjustable valve 3.
The embodiment is further configured as follows: the adjustable valve 3 of the smoke chamber is an adjustable necking box valve.
The embodiment is further configured as follows: when the negative pressure value of the kiln tail smoke chamber is controlled, the pulling air of the high-temperature fan is controlled at a stable value to completely burn the pulverized coal in the rotary kiln 1, so that the increase of the extension resistance caused by a long ring in the kiln is avoided.
The embodiment is further configured as follows: the concentration of the carbon monoxide in the rotary kiln 1 is monitored by an online tracking way through a temperature and pressure gas component sensor.
The embodiment is further configured as follows: the temperature pressure gas composition sensor is installed in the rotary kiln 1.
In this embodiment, the model of the temperature and pressure gas composition sensor is Testo 512.
The embodiment is further configured as follows: when the concentration of nitrogen oxide is controlled, the flame temperature is firstly increased, and the highest flame temperature is controlled to be more than 2000 ℃.
In the implementation, the stable value of the clinker draught is 1.40Nm3/kg.
In this example, the flame temperature was 2000 ℃.
The third embodiment discloses a rotary kiln gas flow rate control method, which comprises a feeding chamber 5 connected with a rotary kiln 1 and a rotary kiln 2, wherein a tertiary air valve 2 is arranged on the feeding chamber 5, and the flow rate control method comprises the following steps:
step one, adding a smoke chamber adjustable valve 3 on a rotary kiln 1;
step two, controlling the negative pressure of a kiln tail smoke chamber of the rotary kiln 1 within-600 Pa;
step three, monitoring the concentration of carbon monoxide in the rotary kiln 1;
and step four, adjusting the tertiary air valve 2 and the smoke chamber adjustable valve 3 to control the concentration of the nitrogen oxides to be over 800 ppm.
In the embodiment, the negative pressure of the kiln tail smoke chamber is within-600 Pa, so that the phenomenon that the kiln tail fly ash smoke is brought by overhigh wind speed in the kiln to increase the internal circulation amount of the decomposing furnace material is avoided;
tracking and detecting the concentration CO of carbon monoxide in the kiln, which is one of necessary conditions for ensuring complete combustion of the pulverized coal;
in the process of adjusting the tertiary air valve 2 and the smoke chamber adjustable valve 3, the concentration of nitrogen oxide NOx in the smoke chamber is controlled to be at least over 800ppm, so that high-temperature combustion flame can be formed in the kiln, and the required clinker with qualified quality is calcined by using relatively less heat provided by pulverized coal combustion.
The embodiment is further configured as follows: the feeding chamber 5 is communicated with a tertiary air pipe 4, and the tertiary air valve 2 is arranged between the tertiary air pipe 4 and the feeding chamber 5; the smoke chamber adjustable valve 3 is arranged between the rotary kiln 1 and the feeding chamber 5.
In this embodiment, the sealing rings are installed at the installation ends of the tertiary air valve 2 and the smoke chamber adjustable valve 3.
The embodiment is further configured as follows: the adjustable valve 3 of the smoke chamber is an adjustable necking box valve.
The embodiment is further configured as follows: when the negative pressure value of the kiln tail smoke chamber is controlled, the pulling air of the high-temperature fan is controlled at a stable value to completely burn the pulverized coal in the rotary kiln 1, so that the increase of the extension resistance caused by a long ring in the kiln is avoided.
The embodiment is further configured as follows: the concentration of the carbon monoxide in the rotary kiln 1 is monitored by an online tracking way through a temperature and pressure gas component sensor.
The embodiment is further configured as follows: the temperature pressure gas composition sensor is installed in the rotary kiln 1.
In the present embodiment, the model of the temperature-pressure gas composition sensor is Fluke 721.
The embodiment is further configured as follows: when the concentration of nitrogen oxide is controlled, the flame temperature is firstly increased, and the highest flame temperature is controlled to be more than 2000 ℃.
In the implementation, the stable value of the clinker draught is 1.42Nm3/kg.
In this example, the flame temperature was 2050 ℃.
The fourth embodiment discloses a rotary kiln gas flow rate control method, which includes a rotary kiln 1 and a feeding chamber 5 connected to the rotary kiln 1, wherein a tertiary air valve 2 is arranged on the feeding chamber 5, and the flow rate control method includes the following steps:
step one, adding a smoke chamber adjustable valve 3 on a rotary kiln 1;
step two, controlling the negative pressure of a kiln tail smoke chamber of the rotary kiln 1 within-600 Pa;
step three, monitoring the concentration of carbon monoxide in the rotary kiln 1;
and step four, adjusting the tertiary air valve 2 and the smoke chamber adjustable valve 3 to control the concentration of the nitrogen oxides to be over 800 ppm.
In the embodiment, the negative pressure of the kiln tail smoke chamber is within-600 Pa, so that the phenomenon that the kiln tail fly ash smoke is brought by overhigh wind speed in the kiln to increase the internal circulation amount of the decomposing furnace material is avoided;
tracking and detecting the concentration CO of carbon monoxide in the kiln, which is one of necessary conditions for ensuring complete combustion of the pulverized coal;
in the process of adjusting the tertiary air valve 2 and the smoke chamber adjustable valve 3, the concentration of nitrogen oxide NOx in the smoke chamber is controlled to be at least over 800ppm, so that high-temperature combustion flame can be formed in the kiln, and the required clinker with qualified quality is calcined by using relatively less heat provided by pulverized coal combustion.
The embodiment is further configured as follows: the feeding chamber 5 is communicated with a tertiary air pipe 4, and the tertiary air valve 2 is arranged between the tertiary air pipe 4 and the feeding chamber 5; the smoke chamber adjustable valve 3 is arranged between the rotary kiln 1 and the feeding chamber 5.
In this embodiment, the sealing rings are installed at the installation ends of the tertiary air valve 2 and the smoke chamber adjustable valve 3.
The embodiment is further configured as follows: the adjustable valve 3 of the smoke chamber is an adjustable necking box valve.
The embodiment is further configured as follows: when the negative pressure value of the kiln tail smoke chamber is controlled, the pulling air of the high-temperature fan is controlled at a stable value to completely burn the pulverized coal in the rotary kiln 1, so that the increase of the extension resistance caused by a long ring in the kiln is avoided.
The embodiment is further configured as follows: the concentration of the carbon monoxide in the rotary kiln 1 is monitored by an online tracking way through a temperature and pressure gas component sensor.
The embodiment is further configured as follows: the temperature pressure gas composition sensor is installed in the rotary kiln 1.
The embodiment is further configured as follows: when the concentration of nitrogen oxide is controlled, the flame temperature is firstly increased, and the highest flame temperature is controlled to be more than 2000 ℃.
In the implementation, the stable value of the clinker draught is 1.45Nm3/kg.
In this example, the flame temperature was 2100 ℃.
When the abnormal working conditions such as crusting occur, the size of the reducing valve of the movable smoke chamber is adjusted, so that an operator can conveniently clean the crusting materials in the rotary kiln 1.
The working principle of the invention is as follows:
the scheme for controlling the airflow in the rotary kiln is created, the negative pressure of the kiln tail smoke chamber, the concentration of carbon monoxide in the kiln and the concentration of nitric oxide in the smoke chamber are mainly adjusted and controlled while the tertiary air valve and the kiln tail smoke chamber valve are carried out, so that high-temperature combustion flame can be formed in the kiln, clinker with qualified quality can be calcined by using relatively less heat provided by pulverized coal combustion, and the stability of the airflow velocity in the rotary kiln and the reasonable combustion of the pulverized coal are realized.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, or orientations or positional relationships that the products of the present invention are usually placed in when used, or orientations or positional relationships that are usually understood by those skilled in the art, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the equipment or the elements that are 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," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between 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.
Claims (9)
1. A rotary kiln gas flow rate control method comprises a rotary kiln (1) and a feeding chamber (5) connected with the rotary kiln (1), wherein a tertiary air valve (2) is arranged on the feeding chamber (5), and is characterized by comprising the following steps:
step one, adding a smoke chamber adjustable valve (3) on a rotary kiln (1);
step two, controlling the negative pressure of a kiln tail smoke chamber of the rotary kiln (1) within-600 Pa;
step three, monitoring the concentration of carbon monoxide in the rotary kiln (1);
and step four, adjusting the tertiary air valve (2) and the smoke chamber adjustable valve (3) to control the concentration of the nitrogen oxides to be over 800 ppm.
2. The rotary kiln gas flow rate control method as claimed in claim 1, wherein: the feeding chamber (5) is communicated with a tertiary air pipe (4), and the tertiary air valve (2) is arranged between the tertiary air pipe (4) and the feeding chamber (5); the smoke chamber adjustable valve (3) is arranged between the rotary kiln (1) and the feeding chamber (5).
3. The rotary kiln gas flow rate control method as claimed in claim 1, wherein: the adjustable valve (3) of the smoke chamber is an adjustable necking box valve.
4. The rotary kiln gas flow rate control method as claimed in claim 1, wherein: when the negative pressure value of the kiln tail smoke chamber is controlled, clinker air-pulling of the high-temperature fan is controlled at a stable value, so that the pulverized coal in the rotary kiln (1) is completely combusted, and the increase of the extension resistance caused by a long ring in the kiln is avoided.
5. The rotary kiln gas flow rate control method as claimed in claim 1, wherein: the concentration of the carbon monoxide in the rotary kiln (1) is monitored by a temperature and pressure gas component sensor in an online tracking manner.
6. The rotary kiln gas flow rate control method as claimed in claim 5, wherein: the temperature and pressure gas component sensor is arranged on the rotary kiln (1).
7. The rotary kiln gas flow rate control method as claimed in claim 1, wherein: when the concentration of nitrogen oxide is controlled, the flame temperature is firstly increased, and the highest flame temperature is controlled to be more than 2000 ℃.
8. The method as claimed in claim 4, wherein the gas flow rate of the rotary kiln is controlled by a gas flow rate control deviceIn the following steps: the clinker aggregate draught stability value is 1.35-1.45 Nm3/kg.sh。
9. A rotary kiln gas flow rate control method as claimed in claim 7, characterized in that: the flame temperature is 1900-2100 ℃.
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| CN106066126A (en) * | 2016-07-27 | 2016-11-02 | 北京凯盛建材工程有限公司 | A kind of overall process low-NO_x combustion technology being applied to cement kiln reduction cement kiln NOx discharge |
| CN106369622A (en) * | 2016-08-27 | 2017-02-01 | 中国葛洲坝集团水泥有限公司 | Bypass exhaust device and treatment method for cooperative household refuse treatment of cement kiln |
| CN206593461U (en) * | 2017-02-21 | 2017-10-27 | 上海万澄环保科技有限公司 | A kind of cement rotary kiln kiln tail smoke-box of adjustable necking cross-sectional flow area |
| CN106907922A (en) * | 2017-03-13 | 2017-06-30 | 上海万澄环保科技有限公司 | A kind of cement rotary kiln kiln tail smoke-box for being provided with negative pressure adjusting device |
| CN112429989A (en) * | 2020-11-20 | 2021-03-02 | 合肥水泥研究设计院有限公司 | Self-adaptive low-nitrogen calcination control system and method for cement kiln |
| CN113375455A (en) * | 2021-06-25 | 2021-09-10 | 山东司德伯重型装备有限公司 | Device for dynamically adjusting area of throat channel of kiln tail smoke chamber of rotary cement kiln |
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