CN211120612U - Low-nitrogen combustion system of tunnel furnace - Google Patents
Low-nitrogen combustion system of tunnel furnace Download PDFInfo
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- CN211120612U CN211120612U CN201921179256.8U CN201921179256U CN211120612U CN 211120612 U CN211120612 U CN 211120612U CN 201921179256 U CN201921179256 U CN 201921179256U CN 211120612 U CN211120612 U CN 211120612U
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Abstract
The utility model discloses a tunnel furnace low-nitrogen combustion system, including the furnace, the furnace right side sets up the chimney, is provided with O in detecting the flue gas in the chimney2、CO、NOxThe component concentration sensor, the air mixer installed at the bottom of kiln, the fresh air chamber and the fume reflux chamber of the air mixer, and the fresh air pipeline and fumeThe air return pipelines are communicated, wherein a fresh air quantity regulating valve is arranged on the fresh air pipeline, and the tail end of the pipeline is connected with an air blower; a flue gas reflux quantity regulating valve and an induced draft fan are arranged on the flue gas reflux pipeline; the device is characterized by further comprising a DCS control system, wherein the mixed air volume, the fresh air volume and the flue gas backflow regulating valve are electrically connected with a DCS control system controller, and the controller sends out control instructions to control the mixed air volume control valve, the fresh air volume regulating valve, the flue gas backflow regulating valve, the heating device, the induced draft fan and the air blower to work. The utility model discloses the low-nitrogen burning of stove kiln, the time limit for a project is short, and the running cost is low, the small investment, and the tradition is compared, and the time limit for a project is short 60%, and the running cost descends 50 ~ 80%.
Description
Technical Field
The utility model relates to an environmental protection equipment field especially relates to a tunnel furnace kiln low-nitrogen combustion system.
Background
The energy consumption of the kiln in China accounts for about 1/3 of industrial energy consumption, the average thermal efficiency of the kiln is about 20 percent lower than that of the kiln abroad, if the energy of the industrial kiln in China is averagely saved by 10 percent, the saved energy is equivalent to 1 hundred million tons of standard coal. Meanwhile, the air tightness of the kiln is very poor, the oxygen content of flue gas reaches about 20%, and the traditional Chinese cloth bag dust removal, desulfurization tower, SCR and SNCR denitration method has no effect on realizing ultralow emission.
During the combustion of fuel, the formation of nitrogen oxides is part of the combustion reaction: the nitrogen oxides formed by combustion being mainly NO and NO2Collectively referred to as NOx. The low-nitrogen combustion is to change the combustion atmosphere and create the conditions for producing carbon monoxide: 2C + O2Carbon monoxide participates in the reduction reaction: 2CO +2NO ═ 2CO2+N2(ii) a Then the furnace slag ash is fully combusted in the combustion area, the carbon content of the furnace slag ash is reduced, and the low-nitrogen combustion is carried out, so that the carbon content of the furnace slag is adjusted to meet the national standard.
Changing the combustion conditions in the front of the kiln to reduce NOxThe exhaust of the furnace is realized, the smoke is recycled and combusted, the generation of partial carbon dioxide is inhibited, the oxygen-deficient combustion is realized, the carbon monoxide is generated, the carbon monoxide is a strong oxidant to reduce the nitrogen monoxide, and the smoke is fully combusted at the rear part of the furnace to generate the carbon dioxide.
Therefore, how to reduce the oxygen content in the kiln is an urgent problem to be solved at present, and meanwhile, the temperature of mixed gas obtained by mixing fresh air and backflow flue gas in a combustion chamber of the tunnel kiln cannot be controlled at present, and the temperature of the mixed gas entering the kiln cannot reach the optimal temperature for actual combustion, so that the NO content after combustion is influencedxThe amount of discharge of (c).
SUMMERY OF THE UTILITY MODEL
In order to compensate the deficiency of the prior art problem, the utility model aims at providing a low nitrogen combustion system of tunnel furnace, the ultralow emission of furnace reforms transform the project particularity, and utility model furnace low nitrogen burning, the time limit for a project is short, and the running cost is low, throwsHas less resources, solves the technical bottleneck of furnace kiln ultralow emission reconstruction for many years, and effectively reduces NOxThe amount of discharge of (c).
The technical scheme of the utility model as follows:
tunnel furnace low-nitrogen combustion system comprises a furnace, wherein a feed inlet and a discharge outlet are respectively arranged on the left side and the right side of the furnace, a chimney is arranged on the right side of the furnace, and O in detected flue gas is arranged in the chimney2、CO、NOxThe sensor of composition concentration, its characterized in that, the air mixer is installed to stove bottom air intake, the air mixer is box structure, is provided with upper baffle, lower baffle in the box, is equipped with the clearance between lower baffle and box preceding curb plate, upper baffle and the box posterior lateral plate and constitutes the passageway that overflows, and upper baffle, lower baffle divide into the three-layer with the box, and the box is flue gas backward flow cavity, new trend cavity, hybrid heating cavity from bottom to top in proper order, is equipped with heating device and temperature sensor in the hybrid heating cavity, and the box upper end has a plurality of mixed wind pipelines, all installs mixed air volume control valve on every mixed wind pipeline;
the fresh air chamber and the flue gas reflux chamber of the air mixer box body are respectively communicated with a fresh air pipeline and a flue gas reflux pipeline, wherein a fresh air volume regulating valve is arranged on the fresh air pipeline, and the tail end of the pipeline is connected with an air blower; a flue gas reflux quantity regulating valve and an induced draft fan are sequentially arranged on the flue gas reflux pipeline;
still including DCS control system, it includes the controller, the controller with mix the air volume control valve fresh air volume adjusting valve flue gas backward flow volume adjusting valve heating device the draught fan the air-blower detect O in the flue gas2、CO、NOxThe sensor of the component concentration and the temperature sensor in the mixing heating chamber are electrically connected.
Detecting O in flue gas2、CO、NOxThe sensor of component concentration, the temperature sensor in the mixing heating chamber feed back the data acquisition to the controller of DCS control system respectively, and the controller sends control command control mixing air volume control valve, new air volume governing valve, flue gas backward flow volume governing valve, heating device, draught fan, air-blower carry out work.
In the low-nitrogen combustion system of the tunnel kiln, a filter screen plate is arranged in the smoke reflux cavity close to the smoke reflux pipeline, and the filter screen plate divides the front side of the smoke reflux cavity into filter cavities.
The low-nitrogen combustion system of the tunnel kiln is characterized in that an air inlet of a fresh air cavity and an air inlet box right side plate of a smoke backflow cavity are arranged on the air inlet box, the air inlet of the fresh air cavity is close to a box front side plate, and the air inlet of the smoke backflow cavity is close to a box rear side plate.
The low-nitrogen combustion system of the tunnel furnace kiln is characterized in that a rotating shaft is respectively arranged in the flue gas backflow cavity and the fresh air cavity, the outer wall of the rotating shaft is provided with a helical blade, two ends of the two rotating shafts are arranged on left and right side plates of the box body, and the two rotating shafts are respectively coaxial with the air inlet of fresh air on the box body and the air inlet center of the flue gas backflow cavity.
The low-nitrogen combustion system of the tunnel furnace is characterized in that the heating device in the mixing heating chamber is an electric heating device or a steam heating device.
The utility model has the advantages that:
1. the utility model discloses the low-nitrogen combustion system of the tunnel furnace mixes the fresh air and the return flue gas in the air mixer, and can adjust the temperature of the mixed air according to the actual working environment requirement;
2. the air volume of the mixed air in the mixer can be independently adjusted by one or more mixed air volume control valves according to the actual working environment requirement, so that the local or integral mixed air can be adjusted as much as possible, and the low-nitrogen combustion is facilitated;
3. the utility model discloses O in DCS control system receives flue gas2、CO、NOxThe component concentration data and the temperature data in the mixing cavity are comprehensively regulated to realize O in the kiln2The control of the NOx emission amount is further accurately controlled;
4. the whole system of the utility model can be manually controlled and can also automatically operate, and the automatic operation realizes the online real-time monitoring and ensures the safety and stability of the system operation;
5. the utility model discloses the low-nitrogen burning of stove kiln, the time limit for a project is short, and the running cost is low, and the small investment is compared with the tradition, and the time limit for a project is short 60%, and the running cost descends 50 ~ 80%.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the air mixer of the present invention.
Fig. 3 is a right side view of fig. 2.
Fig. 4 is a schematic block diagram of the DCS control system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
First, referring to fig. 1 to 4, a tunnel kiln low-nitrogen combustion system according to the present invention is described, which includes a kiln 1, wherein a feed port 2 and a discharge port 3 are respectively disposed at left and right sides of the kiln 1, a chimney 4 is disposed at right side of the kiln 1, and an O for detecting concentration of components in flue gas is disposed in the chimney 42Sensor 5, CO sensor 6, NOxThe sensor 7, the air mixer is installed at the air inlet at the bottom of the kiln 1, the air mixer is of a box structure, an upper partition plate 8 and a lower partition plate 9 are arranged in a box body 24, a gap is formed between the lower partition plate 9 and a front side plate of the box body, and a flow passage 10 is formed by a gap between the upper partition plate 8 and a rear side plate of the box body 1, the upper partition plate 8 and the lower partition plate 9 divide the box body into three layers, the box body is sequentially provided with a flue gas backflow cavity 11, a fresh air cavity 12 and a mixed heating cavity 13 from bottom to top, a heating device 14 and a temperature sensor 15 are arranged in the mixed heating cavity, the upper end of the box body is provided with a plurality of mixed air.
The fresh air chamber 11 and the flue gas reflux chamber 12 of the air mixer box body are respectively communicated with a fresh air pipeline 18 and a flue gas reflux pipeline 19, wherein the fresh air pipeline 18 is provided with a fresh air volume regulating valve 20, and the tail end of the pipeline is connected with an air blower 21; the flue gas reflux pipeline 19 is sequentially provided with a flue gas reflux regulating valve 22 and an induced draft fan 23.
The device also comprises a DCS control system 25, wherein the mixed air volume control valve 17, the fresh air volume regulating valve 20 and the flue gas reflux volume regulating valve 22 are electrically connected with a controller 26 of the DCS control system to detect O in flue gas2、CO、NOxComponent concentration of O2Concentration sensor 5, CO concentration sensor 6, NOxThe concentration sensor 7 and the temperature sensor 15 in the mixed heating chamber 13 respectively feed collected data back to a controller 26 of the DCS control system, and the controller 26 sends out control instructions to control the mixed air volume control valve 17, the fresh air volume regulating valve 20, the flue gas reflux volume regulating valve 22, the heating device 14, the induced draft fan 23 and the blower 21 to work.
The flue gas return chamber 12 is provided with a filter screen plate 27 close to the flue gas return pipeline, and the filter screen plate 27 divides the front side of the flue gas return chamber into a filter chamber 28.
An air inlet 29 of the fresh air cavity 11 and an air inlet 30 of the flue gas backflow cavity are arranged on the right side plate of the box body, the air inlet 29 of the fresh air cavity 11 is close to the front side plate of the box body, and the air inlet 30 of the flue gas backflow cavity is close to the rear side plate of the box body.
The flue gas backflow cavity 12 and the fresh air cavity 11 are internally provided with a rotating shaft 31 respectively, the outer wall of the rotating shaft 31 is provided with a helical blade 32, two ends of the two rotating shafts are arranged on the left side plate and the right side plate of the box body, and the two rotating shafts are coaxial with the air inlet of fresh air on the box body and the center of the air inlet of the flue gas backflow cavity respectively.
The mixing heating chamber interior heating device 14 is an electric heating device or a steam heating device.
In addition, the utility model also provides a combustion method of the low-nitrogen combustion system of the tunnel kiln, which comprises the following steps,
1) debugging and detecting that the system has no fault, starting the system, manually adjusting the minimum to maximum opening degrees of a mixed air volume control valve 17, a fresh air volume adjusting valve 20 and a flue gas reflux volume adjusting valve 22, setting the respective maximum opening degrees on a controller 26 of the DCS control system, adjusting the minimum to maximum working frequencies of an air blower 21 and an induced draft fan 23, and determining the maximum working frequency;
2) adjusting the opening degrees of a mixed air volume control valve, a fresh air volume adjusting valve and a flue gas reflux adjusting valve, wherein the opening degree of the mixed air volume control valve is 100 percent, the opening degree of the fresh air volume adjusting valve is 70-85 percent, and the opening degree of the flue gas reflux adjusting valve is 15-50 percent;
2) each device of the system normally operates, the opening degree of each valve is manually adjusted, and the smoke reflux quantity and the fresh air quantity are ensured to be in a proportion of 15-35% by matching with the variable frequency regulation of the air blower 21 and the induced draft fan 23;
3) the opening degree of each valve is manually adjusted, and O in the smoke is detected through the arrangement in the chimney2、NOxSensor for the concentration of a component, determining O emitted by a combustion plant2、NOxThe content can reach the minimum value, and O is arranged on a controller of the DCS control system2、NOxSetting a target value of the content;
4) the switching system is set to be in an automatic running state to finish O in the kiln2While simultaneously controlling NO in the flue gasxAnd controlling low displacement.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. A tunnel kiln low-nitrogen combustion system comprises a kiln, wherein a feed inlet and a discharge outlet are respectively arranged on the left side and the right side of the kiln, a chimney is arranged on the right side of the kiln, and a detection flue gas O is arranged in the chimney2、CO、NOxThe sensor of composition concentration, its characterized in that, the air intake of kiln bottom portion installs air mixer, air mixer is box structure, is provided with upper baffle, lower baffle in the box, is equipped with the clearance between lower baffle and box preceding curb plate, upper baffle and the box posterior lateral plate and constitutes and overflow the passageway, and upper baffle, lower baffle divide the box into three-layerThe box body is sequentially provided with a flue gas reflux cavity, a fresh air cavity and a mixed heating cavity from bottom to top, a heating device and a temperature sensor are arranged in the mixed heating cavity, the upper end of the box body is provided with a plurality of mixed air pipelines, and each mixed air pipeline is provided with a mixed air volume control valve;
the fresh air chamber and the flue gas reflux chamber of the air mixer box body are respectively communicated with a fresh air pipeline and a flue gas reflux pipeline, wherein a fresh air volume regulating valve is arranged on the fresh air pipeline, and the tail end of the pipeline is connected with an air blower; a flue gas reflux quantity regulating valve and an induced draft fan are sequentially arranged on the flue gas reflux pipeline;
still including DCS control system, it includes the controller, the controller with mix the air volume control valve fresh air volume adjusting valve flue gas backward flow volume adjusting valve heating device the draught fan the air-blower detect O in the flue gas2、CO、NOxThe sensor of the component concentration and the temperature sensor in the mixing heating chamber are electrically connected.
2. The low-nitrogen combustion system of the tunnel kiln according to claim 1, wherein a filter screen plate is installed in the flue gas recirculation chamber near the flue gas recirculation pipe, and the filter screen plate divides the front side of the flue gas recirculation chamber into filter chambers.
3. The low-nitrogen combustion system of the tunnel kiln as recited in claim 1, wherein the air inlet of the fresh air chamber and the air inlet of the flue gas recirculation chamber are arranged on the right side plate of the box body, the air inlet of the fresh air chamber is close to the front side plate of the box body, and the air inlet of the flue gas recirculation chamber is close to the rear side plate of the box body.
4. The low-nitrogen combustion system of the tunnel kiln according to claim 1, wherein a rotating shaft is respectively arranged in the flue gas return chamber and the fresh air chamber, the outer wall of the rotating shaft is provided with helical blades, two ends of the rotating shaft are arranged on the left side plate and the right side plate of the box body, and the two rotating shafts are respectively coaxial with the centers of the fresh air inlet and the flue gas return chamber air inlet on the box body.
5. The system of claim 1, wherein the heating device in the mixing and heating chamber is an electric heating device or a steam heating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921179256.8U CN211120612U (en) | 2019-07-25 | 2019-07-25 | Low-nitrogen combustion system of tunnel furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921179256.8U CN211120612U (en) | 2019-07-25 | 2019-07-25 | Low-nitrogen combustion system of tunnel furnace |
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| CN211120612U true CN211120612U (en) | 2020-07-28 |
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| CN201921179256.8U Active CN211120612U (en) | 2019-07-25 | 2019-07-25 | Low-nitrogen combustion system of tunnel furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296601A (en) * | 2019-07-25 | 2019-10-01 | 启明星宇节能科技股份有限公司 | A kind of tunnel stove low nitrogen burning system and method for controlling combustion |
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2019
- 2019-07-25 CN CN201921179256.8U patent/CN211120612U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296601A (en) * | 2019-07-25 | 2019-10-01 | 启明星宇节能科技股份有限公司 | A kind of tunnel stove low nitrogen burning system and method for controlling combustion |
| CN110296601B (en) * | 2019-07-25 | 2024-05-03 | 启明星宇节能科技股份有限公司 | Low-nitrogen combustion system of tunnel kiln |
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