CN210303149U - Rotary kiln flue gas denitration system and device - Google Patents
Rotary kiln flue gas denitration system and device Download PDFInfo
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- CN210303149U CN210303149U CN201920907101.5U CN201920907101U CN210303149U CN 210303149 U CN210303149 U CN 210303149U CN 201920907101 U CN201920907101 U CN 201920907101U CN 210303149 U CN210303149 U CN 210303149U
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Abstract
The utility model discloses a rotary kiln flue gas denitration system and device, the high temperature flue gas that the rotary kiln combustor burning produced and upper reaches incoming flow material reverse flow, both intermix, accomplish heat exchange, and flue gas temperature reduces gradually along the journey. The rotary kiln body section is provided with a spray gun at the flue gas temperature of 850-1050 ℃, the denitration agent is atomized and then sprayed into the rotary kiln body, and the denitration agent and NOx are subjected to mixed reaction to complete the denitration process. The denitration agent is provided by the ground denitration agent supply module, the denitration agent and the atomized air are conveyed to the rotary kiln body through a rotary sleeve structure, the process of conveying the medium from the static equipment to the dynamic equipment is realized, and then the denitration agent is sprayed into the rotary kiln through the two-stage nozzle group to carry out denitration reaction. For preventing the flue gas from radiating the spray gun body high temperature, the spray gun adopts external sleeve structure, when the spray gun revolves to the high-order by the low level along with the rotary kiln body, opens sleeve deashing valve automatically, and the material that piles up in the clearance sleeve protects nozzle, sleeve not to receive the material jam. The utility model discloses successfully solved rotary kiln denitration difficult problem such as rotary kiln, and had advantages such as the system is simple, the energy consumption is low, take up an area of for a short time, the investment is low, had very big application prospect under the environment-friendly situation that is increasingly harsh.
Description
Technical Field
The utility model relates to a flue gas treatment field, concretely relates to rotary kiln flue gas denitration system and device.
Background
With the rapid development of economy in China, the topic of environmental protection is greatly concerned. At present, the smoke emission of the industries such as thermal power, chemical industry, steel, nonferrous industry and the like in China all have relevant policies, and the emission of nitrogen oxides, sulfur dioxide and dust is required to be strictly controlled. After several years of efforts of all parties, great progress is made, and the effect of blue sky defense war is obvious. The pollutant emission control in the next stage is fully developed in each dispersed emission source.
The industries such as cement, lime and the like adopt the rotary kiln to calcine materials, belong to dispersed emission sources, and the amount of flue gas treatment of the rotary kiln in China is large. The rotary kiln smoke treatment has been paid much attention to, and is a control difficulty recognized by the current environmental protection industry, especially the removal of nitrogen oxide (NOx). The conventional flue gas denitration technology comprises two denitration technologies of SCR (selective catalytic reduction) and SNCR (non-selective catalytic reduction). In recent years, oxidation denitration technology is gradually rising, wherein oxidation denitration mainly utilizes an oxidant to oxidize nitric oxide and convert the nitric oxide into high-valence nitric oxide, and the high-valence nitric oxide is easily dissolved in water, so that the nitric oxide can be absorbed and removed by utilizing a downstream desulfurization section of flue gas.
Because the final exhaust gas temperature of the rotary kiln production line is low and is only about 120-180 ℃, the ash content of a high-temperature exhaust gas area is usually huge (more than 100 g/Nm)3) Therefore, the existing mature denitration process is difficult to transport and utilize. At present, an engineering case of adopting high-temperature SCR denitration is provided, a denitration reactor is arranged at a high-ash position, and flue gas is subjected to pre-dedusting treatment and then denitration when entering the reactor. The process is very tested for the design and operation of a high-temperature electric dust remover (above 320 ℃), the design experience of a large-scale high-temperature electric dust remover does not exist in China, and the reliability of the process needs to be studied; part trade personnel recommend to adopt low temperature SCR denitration, arrange the reactor in the dust remover rear to reduce the influence of ash content to the catalyst. But the low-temperature denitration needs to ensure that the temperature of the flue gas is controlled from 120-1The temperature of 80 ℃ rises to over 230 ℃, which causes a great deal of energy waste. The concentration of sulfur dioxide in flue gas of the rotary kiln is usually 200mg/Nm3, the dew point temperature of ammonium bisulfate is high, and the condensation is easy to block catalyst holes, so that the process has a great risk; the oxidation method denitration is not suitable for rotary kiln denitration, mainly because most of the existing rotary kilns are not provided with wet method/semi-dry method desulfurization at the tail part, and lack an absorption section for high-valence nitrogen oxides, and the oxidant is expensive and the operating cost is extremely high.
Through the retrieval, there is utility model patent CN208574451U, this utility model provides a denitration system is united to limekiln, the system spouts reductant and denitrifier respectively into limekiln combustor department, utilizes reductant and denitrifier NOx in the desorption part flue gas respectively. Although this system can realize the denitration function, there are the following problems. Firstly, the flue gas temperature of the gas burner is high, generally can reach 1200-1500 ℃, and the working condition of the spray gun is relatively severe, and meanwhile, the secondary oxidation can be caused to the denitrifying agent, and the denitrifying agent can generate NOx through oxidation, so that the overall denitrifying efficiency of the system is relatively low. Secondly, because the overflowing space at the burner is large, the denitration agent and the reducing agent are sprayed from the burner and have poor mixing uniformity with NOx, so that the denitration efficiency is further reduced. Finally, the system adopts combustible and explosive gases such as methane, hydrogen and the like as reducing agents to reduce NOx, so that certain explosion risk exists, and the risk of explosion exists when unreacted reducing agents are accumulated in a tail flue.
There is utility model patent CN207996557U again, this utility model provides a cement rotary kiln denitrification facility, the device sets up the dore furnace between rotary kiln exhanst gas outlet and C1 whirlwind section of thick bamboo entry, to the afterburning intensification in dore furnace lower part, and ammonia water solution is sprayed on upper portion, carries out the denitration, and last part high temperature is discharged fume and is taken out back to dore furnace upper portion cyclic utilization through the draught fan. The system belongs to compound SNCR denitration in the strict sense, but the system design has a part of unreasonable places, firstly, the flue gas needs to be heated to a higher temperature in a decomposing furnace to complete the SNCR denitration reaction, and the energy consumption is higher. Secondly, the part of flue gas returned by the C1 cyclone is subjected to secondary denitration in the reduction tower, which is redundant, and after the flue gas is subjected to heat exchange by the five-stage cyclone heat exchanger, the residual temperature is very low and is far lower than a temperature window required by SNCR denitration reaction, and almost no denitration capability exists. Finally, the system design is too complex, and more devices need to be added.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model discloses a novel rotary kiln flue gas denitration system, this system belong to the SNCR denitration category, directly find rotary kiln 850 ~ 1050 ℃ temperature section, spray into the rotary kiln with the denitration agent in with flue gas direct contact accomplish denitration reaction. The system does not increase extra energy consumption, only sprays a small amount of denitration agent solution on the rotary kiln body, has little influence on the original rotary kiln calcining process, and has simple system and small occupied area.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a rotary kiln flue gas denitration system and a rotary kiln flue gas denitration device belong to the SNCR denitration category. The denitration agent is provided by a denitration agent supply module arranged on the ground, and the denitration agent can be ammonia water solution, urea solution or melamine emulsion. The denitrifier is conveyed to the rotary kiln body from the ground through the rotary sleeve. The process is as follows, the denitrifier solution is conveyed to a rotary sleeve connected with the rotary kiln through a pipeline, the stator end of the rotary sleeve rotates together with the rotary kiln, the outlet of the stator end is connected with the spray gun group, and the rotor end is connected with the outlet pipeline of the conveying module, so that the material supply to the rotary equipment is realized. The compressed air supply and the denitrifier supply are similar. The denitration agent and the compressed air are conveyed to the spray gun group along a pipeline fixed on the rotary kiln body, are atomized and sprayed into the rotary kiln through the spray head, and complete denitration reaction with the high-temperature flue gas; the nozzle groups are arranged in two stages, and the temperature window of most of the denitration agent spraying positions is guaranteed to be within the range of 850-1050 ℃ under the conditions of starting the rotary kiln and changing the load. Because the high-temperature flue gas (850-1050 ℃) has strong radiation effect on the spray gun, in order to avoid damage of the spray gun, the spray gun adopts a sleeve structure, namely, a large-diameter circular pipe is sleeved on the outer side of the spray gun body, so that the radiation effect of the high-temperature flue gas on the spray gun is shielded. Because the spray gun is installed on the rotary kiln body, when the spray gun rotated the below along with the rotary kiln body, in a large amount of materials can pour the sleeve into in the rotary kiln furnace body, caused the sleeve to block up, because the ash belongs to good heat-transfer conductor, the spray gun still can be heated deformation, damage even for a long time of operating duration, need when the spray gun rotated the rotary kiln top with compressed air with piling up the ash in with the sleeve sweep clean. Therefore, a proximity switch is arranged at a certain height of the rotary kiln body for each spray gun, the side of the proximity switch sensor is arranged on the proximity switch support, the installation height needs to ensure that the inclination angle of the sleeve is larger than the self-stop angle of the ash material, when the rotary kiln rotates to the set height, the electrode of the proximity switch contacts with the fixed sensor body, and the signal is used as a sleeve injection ash removal signal.
The utility model has the advantages that:
a rotary kiln flue gas deNOx systems and device, successfully introduce the rotary kiln denitration with SNCR, realized economic, the energy-conserving denitration of rotary kiln. Firstly, the energy consumption is low, because this system does not add extra flue gas heating system, whole energy consumption is than the power consumption that only supplies the module circulating pump for the denitration. Meanwhile, the denitration efficiency is high, the flue gas and materials are intensively mixed, NOx and the denitration agent in the flue gas are uniformly mixed, the coefficient of the uniformity of the section ammonia nitrogen is up to 5% through numerical simulation calculation, the mixing effect is very good, and the denitration efficiency can reach 70-80%. Finally, the investment cost is low, only a few devices such as a spray gun, a rotating sleeve, a supply module and the like are additionally arranged, and the work load is small.
Drawings
FIG. 1 is a schematic view of a denitration system of the whole device;
FIG. 2 is a schematic view of a two-stage lance arrangement;
fig. 3 is a schematic view of a rotary sleeve structure.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and embodiments, which are to be understood as illustrative only and not limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Respectively as shown in fig. 1, fig. 2, fig. 3, a rotary kiln flue gas denitration system and device mainly contain rotary kiln body (6), rotating sleeve (1), rotating sleeve fixed bolster (7), nozzle group (2), wireless ooff valve (3), proximity switch (4), proximity switch adjustment support (5), denitrifier supply module (8), air compression station (9). The denitration agent solution supply device is characterized in that a denitration agent solution is provided by a supply module (8), a solution input pipeline is connected with a rotor end (101) of a steering sleeve (1), a solution output pipeline is connected with a stator end (102) of the steering sleeve, compressed air is provided by an air pressure station (9), the compressed air input pipeline is connected with the rotor end (101) of the steering sleeve (1), the compressed air output pipeline is connected with the stator end (102) of the steering sleeve, the denitration agent output pipeline is respectively connected with a first-stage nozzle group (2) and a second-stage nozzle group (2) solution inlet, the compressed air pipeline from the air pressure station (9) is divided into two paths, one path is connected with the nozzle group compressed air inlet, the other path is connected with a wireless switch valve (3), and the outlet of the wireless switch valve (3) is connected with a nozzle sleeve. The rotary kiln is characterized in that a proximity switch adjusting support (5) is arranged on the basis of the end of the rotary kiln, a proximity switch (4) is installed on the proximity switch adjusting support, and the polarity end of the proximity switch (4) is installed on the rotary kiln body.
The rotary sleeve (1) of the system is characterized by being coaxially arranged at the end of the rotary kiln, namely the rotary center of the rotary kiln is coincided with the rotary center of the rotary sleeve, and the position of the rotary sleeve is adjusted and fixed by a rotary sleeve fixing support (7).
The rotary sleeve fixing support is characterized in that the rotary sleeve fixing support is fixed on a rotary kiln body, the position of a center line of a rotary sleeve fixed on the rotary sleeve fixing support can be adjusted through a nut tightened in the direction of X, Y, and the direction of X, Y is a vertical rotary shaft plane.
The rotating sleeve of the system is characterized by comprising a rotor end (101), a stator end (102), a labyrinth sealing groove (103) and an O-shaped ring (104), wherein the rotor end and the stator end are in clearance fit, and the average clearance is 20 threads.
The spray nozzle group (2) is characterized by being arranged in two stages and arranged at the 850-1050 ℃ temperature section of the rotary kiln, 2-5 spray guns can be arranged in each stage of spray nozzle group according to the inner diameter of the rotary kiln, the spray guns are uniformly arranged around the circumference, and the spray guns in the first-stage spray nozzle group and the second-stage spray nozzle group are arranged in a staggered manner. The length of the spray gun is required to ensure that the spray nozzle is arranged in a tangent circle of the highest material level of the rotary kiln material layer. The spray gun adopts a sleeve structure, and the extension of the sleeve is slightly larger than the total length of the spray gun. The sleeve is connected with a compressed air pipeline, and the on-off of the compressed air is controlled by a wireless switch valve (3) on the pipeline.
The proximity switch (4) and the proximity switch fixing support (5) are characterized in that the mounting angle of the fixing support can be adjusted according to the repose angle of ash in the sleeve so as to determine the mounting angle of the proximity switch. The installation quantity of the proximity switches is the same as the total quantity of the spray guns, the electrode end corresponding to each proximity switch is installed on the outer wall of the rotary kiln, and the installation peripheral angle of the electrodes is the same as that of the corresponding spray guns.
The denitration agent is provided by a denitration agent supply module arranged on the ground, and the denitration agent can be ammonia water solution, urea solution or melamine emulsion. The denitrifier is conveyed to the rotary kiln body from the ground through the rotary sleeve. The process is as follows, the denitration agent solution is conveyed to a rotary sleeve connected with the rotary kiln through a pipeline, the stator end of the rotary sleeve rotates together with the rotary kiln, the outlet of the stator end is connected with the spray gun group, and the rotor end is connected with the outlet pipeline of the conveying module, so that the material supply to the rotary equipment is realized, and the compressed air supply and the denitration agent supply are similar. The denitration agent and the compressed air are conveyed to the spray gun group along a pipeline fixed on the rotary kiln body, are atomized and sprayed into the rotary kiln through the spray head, and complete denitration reaction with the high-temperature flue gas; the nozzle groups are arranged in two stages, and the temperature window of most of the denitration agent spraying positions is guaranteed to be within the range of 850-1050 ℃ under the conditions of starting the rotary kiln and changing the load. Because the high-temperature flue gas (850-1050 ℃) has strong radiation effect on the spray gun, in order to avoid damage of the spray gun, the spray gun adopts a sleeve structure, namely, a large-diameter circular pipe is sleeved on the outer side of the spray gun body, so that the radiation effect of the high-temperature flue gas on the spray gun is shielded. Because the spray gun is installed on the rotary kiln body, when the spray gun rotated the below along with the rotary kiln body, in a large amount of materials can pour the sleeve into in the rotary kiln furnace body, caused the sleeve to block up, because the ash belongs to good heat-transfer conductor, the spray gun still can be heated deformation, damage even for a long time of operating duration, need when the spray gun rotated the rotary kiln top with compressed air with piling up the ash in with the sleeve sweep clean. Therefore, a proximity switch is arranged at a certain height of the rotary kiln body for each spray gun, the side of the proximity switch sensor is arranged on the proximity switch support, the installation height needs to ensure that the inclination angle of the sleeve is larger than the self-stop angle of the ash material, when the rotary kiln rotates to the set height, the electrode of the proximity switch contacts with the fixed sensor body, and the signal is used as a sleeve injection ash removal signal. When the spray gun rotates upwards along with the rotary kiln, the proximity switch sends a signal back to the control system, the control system returns a signal to the wireless switch valve after receiving the command, the switch valve acts to be opened, compressed air is sprayed instantly to finish ash removal, and the wireless switch valve is automatically closed after 2s of delay.
Examples
The flue gas parameters of the lime rotary kiln are as follows:
TABLE 1 Smoke parameters of a rotary kiln
Flue gas denitration process:
by means of injected NH3Reacts with NO in the flue gas to generate N2And H2O; the reaction must be carried out at elevated temperatures. The reaction formula is as follows:
4NO+4NH3+O2→4N2+6H2O (1)
4NH3+5O2→4NO+6H2O (2)
the reaction temperature generated in the reaction formula (1) is 1070-1270K; while reaction (2) occurs at temperatures above 1370K. Therefore, the temperature control of SNCR method must be between 1200-1400K, i.e. between 850-1150 ℃.
In the scheme, the lime kiln has a temperature range of 950 ℃ and 1050 ℃ and a length of about 10m, the reaction temperature of the lime kiln is just consistent with the ideal SNCR reaction temperature, the problem of NH3 oxidation reaction is not easy to occur, the flue gas flow field of the lime kiln is favorable for well mixing the injected reducing agent and the flue gas, the effective retention time can reach more than 1 second, and the lime kiln is an ideal SNCR reactant injection point, so that the SNCR denitration efficiency of the lime kiln can reach more than 720 percent. According to the embodiment, the whole system is low in investment and operation cost, small in occupied area, high in denitration efficiency and extremely high in feasibility.
The main technical indexes of the embodiment
Main technical indexes
1) Reasonable temperature field (850-;
2) reaction time >0.5 s;
3) a uniform reductant distribution field;
4) ammonia slip <10 ppm;
5) the technology is mature, and the energy consumption is low.
The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features.
Claims (6)
1. A rotary kiln flue gas denitration system and a rotary kiln flue gas denitration device comprise a rotary kiln body (6), a rotary sleeve (1), a rotary sleeve fixing support (7), a nozzle group (2), a wireless switch valve (3), a proximity switch (4), a proximity switch adjusting support (5), a denitration agent supply module (8) and an air compression station (9); the method is characterized in that: the denitration agent solution is provided by a supply module (8), a solution input pipeline is connected with a rotor end (101) of a rotating sleeve (1), a solution output pipeline is connected with a stator end (102) of the rotating sleeve, compressed air is provided by an air pressure station (9), a compressed air input pipeline is connected with the rotor end (101) of the rotating sleeve (1), a compressed air output pipeline is connected with the stator end (102) of the rotating sleeve, the denitration agent output pipeline of the rotating sleeve is respectively connected with a solution inlet of a first-stage nozzle group (2) and a solution inlet of a second-stage nozzle group (2), the compressed air conveyed from the air pressure station (9) is divided into two paths after passing through the rotating sleeve, one path is connected with a compressed air inlet of the nozzle group, the other path is connected with a wireless switch valve (3), and an outlet of the wireless switch valve (3) is connected with the other sleeve of; the rotary kiln is characterized in that a proximity switch adjusting support (5) is arranged on the basis of the end of the rotary kiln, a proximity switch (4) is installed on the proximity switch adjusting support, and the polarity end of the proximity switch (4) is installed on the rotary kiln body.
2. The rotary kiln flue gas denitration system and the rotary kiln flue gas denitration device as claimed in claim 1, wherein the rotary sleeve (1) is coaxially installed at the end of the rotary kiln, that is, the rotary center of the rotary kiln and the rotary center of the rotary sleeve coincide, and the position of the rotary sleeve is adjusted and fixed by the rotary sleeve fixing support (7).
3. The system and apparatus for denitration of flue gas in a rotary kiln as claimed in claim 2, wherein the rotary sleeve fixing bracket is fixed to the rotary kiln body and rotates with the rotary kiln, the position of the center line of the rotary sleeve fixed thereto can be adjusted by a tightening nut in direction X, Y, and the direction X, Y is a plane perpendicular to the rotation axis.
4. The rotary kiln flue gas denitration system and the rotary kiln flue gas denitration device as claimed in claim 1, wherein the rotary sleeve is composed of a rotor end (101), a stator end (102), a labyrinth seal groove (103) and an O-shaped ring set (104), the rotor end and the stator end are in clearance fit, and the average clearance is 20 wires.
5. The rotary kiln flue gas denitration system and the rotary kiln flue gas denitration device as claimed in claim 1, wherein the nozzle groups (2) are arranged in two stages and are arranged in the 850-1050 ℃ temperature section of the rotary kiln, 2-5 spray guns can be arranged in each stage of nozzle group according to the inner diameter of the rotary kiln, the spray guns are uniformly arranged around the circumference, and the spray guns in the first-stage nozzle group and the second-stage nozzle group are arranged in a staggered manner.
6. The rotary kiln flue gas denitration system and the device thereof as claimed in claim 1, wherein the proximity switches (4) and the proximity switch fixing support (5) are mounted in the same number as the total number of the spray guns, the electrode end corresponding to each proximity switch is mounted on the outer wall of the rotary kiln, and the electrode mounting peripheral angle is the same as the electrode mounting peripheral angle corresponding to the spray gun when the rotary kiln rotates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920907101.5U CN210303149U (en) | 2019-06-15 | 2019-06-15 | Rotary kiln flue gas denitration system and device |
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| CN201920907101.5U CN210303149U (en) | 2019-06-15 | 2019-06-15 | Rotary kiln flue gas denitration system and device |
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| CN210303149U true CN210303149U (en) | 2020-04-14 |
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| CN201920907101.5U Expired - Fee Related CN210303149U (en) | 2019-06-15 | 2019-06-15 | Rotary kiln flue gas denitration system and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110170245A (en) * | 2019-06-15 | 2019-08-27 | 南京碧霞环保工程有限公司 | A kind of rotary kiln flue gas denitrification system and device |
| CN113289480A (en) * | 2021-05-13 | 2021-08-24 | 天津中材工程研究中心有限公司 | Cement kiln predecomposition system for SNCR denitration optimization |
-
2019
- 2019-06-15 CN CN201920907101.5U patent/CN210303149U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110170245A (en) * | 2019-06-15 | 2019-08-27 | 南京碧霞环保工程有限公司 | A kind of rotary kiln flue gas denitrification system and device |
| CN113289480A (en) * | 2021-05-13 | 2021-08-24 | 天津中材工程研究中心有限公司 | Cement kiln predecomposition system for SNCR denitration optimization |
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