CN110296601B - Low-nitrogen combustion system of tunnel kiln - Google Patents
Low-nitrogen combustion system of tunnel kiln Download PDFInfo
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- CN110296601B CN110296601B CN201910675528.1A CN201910675528A CN110296601B CN 110296601 B CN110296601 B CN 110296601B CN 201910675528 A CN201910675528 A CN 201910675528A CN 110296601 B CN110296601 B CN 110296601B
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 38
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 25
- 238000010992 reflux Methods 0.000 claims abstract description 49
- 239000000779 smoke Substances 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 48
- 239000003546 flue gas Substances 0.000 claims description 44
- 238000005192 partition Methods 0.000 claims description 18
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000009841 combustion method Methods 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
Classifications
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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
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/36—Arrangements of heating devices
-
- 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
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Regulation And Control Of Combustion (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a tunnel kiln low-nitrogen combustion system and a combustion control method, wherein the tunnel kiln low-nitrogen combustion system comprises a kiln, a chimney is arranged on the right side of the kiln, a sensor for detecting the concentration of O 2、CO、NOx components in smoke is arranged in the chimney, an air mixer is arranged at an air inlet at the bottom of the kiln, a fresh air chamber and a smoke reflux chamber of a box body of the air mixer are respectively communicated with a fresh air pipeline and a smoke reflux pipeline, and a fresh air volume regulating valve is arranged on the fresh air pipeline and connected with a blower at the tail end of the pipeline; a smoke reflux quantity regulating valve and a draught fan are arranged on the smoke reflux pipeline; the system also comprises a DCS control system, wherein the mixed air quantity, the fresh air quantity and the smoke reflux quantity regulating valve are electrically connected with a DCS control system controller, and the controller sends out control instructions to control the mixed air quantity control valve, the fresh air quantity regulating valve, the smoke reflux quantity regulating valve, the heating device, the induced draft fan and the blower to work. The invention has the advantages of low nitrogen combustion, short construction period, low operation cost and less investment, compared with the traditional method, the invention has the advantages of 60 percent shorter construction period and 50-80 percent lower operation cost.
Description
Technical Field
The invention relates to the field of environmental protection equipment, in particular to a low-nitrogen combustion system of a tunnel kiln.
Background
The energy consumption of the kiln in China is about 1/3 of the industrial energy consumption, the average heat efficiency of the kiln is about 20 percent lower than that of the kiln abroad, and if the average energy of the industrial kiln in China is saved by 10 percent, the saved energy is equivalent to 1 hundred million tons of standard coal. Meanwhile, the furnace has very poor air tightness, the oxygen content of the flue gas reaches about 20%, and the traditional bag-type dust removal, desulfurizing tower, SCR and SNCR denitration method in China can realize the inability of ultra-low emission.
During combustion of fuel, the formation of nitrogen oxides is part of the combustion reaction: the nitrogen oxides produced by combustion are mainly NO and NO 2, collectively referred to as NO x. The low-nitrogen combustion is to change the combustion atmosphere and create the condition for producing carbon monoxide, wherein C+O=CO, and the carbon monoxide participates in the reduction reaction, and CO+N 2O＝CO2+N2; and then fully burning in a burning zone to reduce the carbon content of slag ash, wherein the low-nitrogen burning is to pay attention to adjusting the carbon content of slag to meet the national standard.
The front part of the kiln changes the combustion condition to reduce the emission of NOx, the smoke is recycled for combustion, part of carbon dioxide is restrained from being generated, oxygen-deficient combustion is carried out to generate carbon monoxide, the carbon monoxide is a strong oxidant for reducing the nitrogen monoxide, and the rear part of the kiln fully combusts the smoke to generate carbon dioxide.
Then, how to reduce the oxygen content in the kiln is a problem to be solved at present, and meanwhile, the temperature of the mixed gas after the fresh air and the return smoke in the combustion chamber of the tunnel kiln can not be controlled, and the temperature of the mixed gas entering the kiln can not reach the optimal temperature for actual combustion, thereby influencing the emission of NOx after combustion.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a tunnel kiln low-nitrogen combustion system and a combustion control method, which are special in kiln ultra-low emission modification projects, and the tunnel kiln low-nitrogen combustion system is short in construction period, low in running cost and low in investment, solves the technical bottleneck of kiln ultra-low emission modification for many years, and effectively reduces the emission of NOx.
The technical scheme of the invention is as follows:
The 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, a sensor for detecting the concentration of O 2、CO、NOx components in smoke is arranged in the chimney, and the tunnel kiln low-nitrogen combustion system is characterized in that an air inlet at the bottom of the kiln is provided with an air mixer, the air mixer is of a box type structure, an upper partition plate and a lower partition plate are arranged in a box body, gaps are formed between the lower partition plate and a front side plate of the box body and between the upper partition plate and a rear side plate of the box body to form a flow passage, the upper partition plate and the lower partition plate divide the box body into three layers, a smoke backflow cavity, a fresh air cavity and a mixed heating cavity are sequentially arranged from bottom to top, a heating device and a temperature sensor are arranged in the mixed heating cavity, a plurality of mixed air pipelines are arranged at the upper end of the box body, and a mixed air control valve is arranged on each mixed air pipeline;
the fresh air chamber and the smoke reflux chamber of the air mixer box body are respectively communicated with a fresh air pipeline and a smoke reflux pipeline, wherein a fresh air quantity regulating valve is arranged on the fresh air pipeline and a blower is connected to the tail end of the pipeline; a smoke reflux quantity regulating valve and an induced draft fan are sequentially arranged on the smoke reflux pipeline;
The novel flue gas reflux quantity control system is characterized by further comprising a DCS control system, wherein the mixed air quantity control valve, the fresh air quantity control valve, the flue gas reflux quantity control valve and a controller of the DCS control system are electrically connected, a sensor for detecting the concentration of O 2、CO、NOx components in flue gas and a temperature sensor in the mixed heating cavity are respectively used for feeding back acquired data to the controller of the DCS control system, and the controller is used for controlling the working states of the mixed air quantity control valve, the fresh air quantity control valve, the flue gas reflux quantity control valve, the heating device, the induced draft fan and the blower.
And the low-nitrogen combustion system of the tunnel kiln is characterized in that a filter screen plate is arranged in the flue gas backflow chamber close to the flue gas backflow pipeline, and the front side of the flue gas backflow chamber is divided into filter chambers by the filter screen plate.
The tunnel kiln low-nitrogen combustion system is characterized in that an air inlet of the fresh air chamber and an air inlet box body right side plate of the smoke backflow chamber are arranged on the box body front side plate, the air inlet of the fresh air chamber is close to the box body front side plate, and the air inlet of the smoke backflow chamber is close to the box body rear side plate.
The low-nitrogen combustion system of the tunnel kiln is characterized in that a rotating shaft is arranged in the flue gas backflow chamber and the fresh air chamber respectively, spiral blades are arranged on the outer wall of the rotating shaft, 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 coaxial with the center of the air inlet of the fresh air on the box body and the center of the air inlet of the flue gas backflow chamber respectively.
The heating device in the mixed heating chamber is an electric heating device or a steam heating device.
The combustion method of the tunnel kiln low-nitrogen combustion system comprises the following steps,
1) The system is started, the minimum to maximum opening of the mixed air volume control valve, the fresh air volume control valve and the smoke reflux volume control valve are manually adjusted, the respective maximum opening is set on a controller of the DCS control system, the minimum to maximum working frequencies of the blower and the induced draft fan are adjusted, and the maximum working frequency is determined to be set;
2) The opening of the mixed air quantity control valve, the fresh air quantity control valve and the flue gas reflux quantity control valve are adjusted, the opening of the mixed air quantity control valve is 100%, the opening of the fresh air quantity control valve is 70% -85%, and the opening of the flue gas reflux quantity control valve is 15% -50%;
3) The equipment of the system normally operates, and the flue gas reflux quantity and the fresh air quantity are ensured to be in a proportion of 15-35% by manually adjusting the opening and closing degree of each valve and matching with the variable frequency adjustment of the blower and the induced draft fan;
4) The opening degree of each valve is manually adjusted, a sensor for detecting the concentration of O 2、CO、NOx components in the smoke is arranged in a chimney, the minimum value which can be reached by the content of O 2、NOx discharged by combustion equipment is determined, and the target value setting of the content of O 2、NOx is set on a controller of a DCS control system;
5) And finishing the setting of the switching system to an automatic operation state, finishing the control of the O 2 in the kiln and simultaneously controlling the low discharge of NOx in the flue gas.
The invention has the advantages that:
1. The low-nitrogen combustion system of the tunnel kiln mixes fresh air and return smoke in the air mixer, and then the temperature of the mixed air can be adjusted according to the actual working environment requirements;
2. According to the invention, 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, and local or whole mixed air is adjusted as much as possible, so that low-nitrogen combustion is facilitated;
3. The DCS control system receives the concentration data of the O 2、CO、NOx component in the flue gas and the temperature data in the mixing chamber, comprehensively adjusts each control valve, the blower, the induced draft fan, the heating device and the like, realizes the control of O 2 in the kiln, and further accurately controls the discharge amount of NO x;
4. The whole system can be manually controlled or automatically operated, and the automatic operation realizes on-line real-time monitoring, so that the safety and stability of the system operation are ensured;
5. The invention has the advantages of low nitrogen burning of the kiln, short construction period, low operation cost, less investment, 60 percent shorter construction period and 50 to 80 percent lower operation cost compared with the prior art.
Drawings
Fig. 1 is a schematic structural view 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 an inventive DCS control system.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Firstly, referring to fig. 1-4, a low nitrogen combustion system of a tunnel kiln according to the invention is described, the low nitrogen combustion system of the tunnel kiln comprises a kiln 1, a feed inlet 2 and a discharge outlet 3 are respectively arranged on the left side and the right side of the kiln 1, a chimney 4 is arranged on the right side of the kiln 1, an O 2 sensor 5, a CO sensor 6 and an NO x sensor 7 for detecting the concentration of components in smoke are arranged in the chimney 4, a mixer is arranged at the air inlet at the bottom of the kiln 1, the mixer is of a box type structure, an upper partition 8 and a lower partition 9 are arranged in a box 24, gaps are arranged between the lower partition 9 and the front side plate of the box, the upper partition 8 and the rear side plate of the box 1 to form a through-flow channel 10, the upper partition 8 and the lower partition 9 divide the box into three layers, the box is sequentially provided with a smoke reflux chamber 11, a fresh air chamber 12 and a mixed heating chamber 13 from bottom to top, a heating device 14 and a temperature sensor 15 are arranged in the mixed heating chamber, a plurality of mixed air pipelines 16 are arranged at the upper end of the box, and a mixed air control valve 17 is arranged on each mixed air pipeline 16.
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 a fresh air quantity regulating valve 20 is arranged on the fresh air pipeline 18 and a blower 21 is connected to the tail end of the pipeline; the flue gas reflux pipeline 19 is provided with a flue gas reflux quantity regulating valve 22 and an induced draft fan 23 in sequence.
The system also comprises a DCS control system 25, a mixed air volume control valve 17, a fresh air volume control valve 20 and a flue gas reflux volume control valve 22 are electrically connected with a controller 26 of the DCS control system, an O 2 concentration sensor 5, a CO concentration sensor 6, an NO x concentration sensor 7 for detecting the concentration of an O 2、CO、NOx component in flue gas and a temperature sensor 15 in the mixed heating chamber 13 respectively feed back acquired data to the controller 26 of the DCS control system, and the controller 26 sends control instructions to control the mixed air volume control valve 17, the fresh air volume control valve 20, the flue gas reflux volume control valve 22, the heating device 14, the induced draft fan 23 and the blower 21 to work.
A filter screen plate 27 is arranged in the flue gas recirculation chamber 12 close to the flue gas recirculation pipeline, and the front side of the flue gas recirculation chamber is divided into a filter chamber 28 by the filter screen plate 27.
The air inlet 29 of the fresh air chamber 11 and the air inlet 30 of the smoke reflux chamber are arranged on the right side plate of the box body, the air inlet 29 of the fresh air chamber 11 is close to the front side plate of the box body, and the air inlet 30 of the smoke reflux chamber is close to the rear side plate of the box body.
The flue gas reflux chamber 12 and the fresh air chamber 11 are respectively provided with a rotating shaft 31, 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 respectively coaxial with the center of the air inlet of the fresh air on the box body and the center of the air inlet of the flue gas reflux chamber.
The heating device 14 in the mixed heating chamber is an electric heating device or a steam heating device.
In addition, the invention also provides a combustion method of the tunnel kiln low-nitrogen combustion system, which comprises the following steps,
1) The system is started, the minimum to maximum opening of the mixed air quantity control valve 17, the fresh air quantity control valve 20 and the smoke reflux quantity control valve 22 are manually adjusted, the respective maximum opening is set on the controller 26 of the DCS control system, the minimum to maximum working frequency of the blower 21 and the induced draft fan 23 is adjusted, and the maximum working frequency is determined to be set;
2) The opening of the mixed air quantity control valve, the fresh air quantity control valve and the flue gas reflux quantity control valve are adjusted, the opening of the mixed air quantity control valve is 100%, the opening of the fresh air quantity control valve is 70% -85%, and the opening of the flue gas reflux quantity control valve is 15% -50%;
3) The equipment of the system normally operates, and the flue gas reflux quantity and the fresh air quantity are ensured to be in a proportion of 15-35% by manually adjusting the opening and closing degree of each valve and matching with the variable frequency adjustment of the blower 21 and the induced draft fan 23;
4) The opening degree of each valve is manually adjusted, a sensor for detecting the concentration of O 2、NOx components in the smoke is arranged in a chimney, the minimum value which can be reached by the content of O 2、NOx discharged by combustion equipment is determined, and the target value setting of the content of O 2、NOx is set on a controller of a DCS control system;
5) And finishing the setting of the switching system to an automatic operation state, finishing the control of the O 2 in the kiln and simultaneously controlling the low discharge of NOx in the flue gas.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, the technical solutions obtained by logic analysis, reasoning or limited experiments based on the prior art by those skilled in the art according to the present invention should be within the scope of protection defined by the claims.
Claims (1)
1. The low-nitrogen combustion system of the tunnel kiln comprises the 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, a sensor for detecting the concentration of O 2、CO、NOx components in smoke is arranged in the chimney, and the low-nitrogen combustion system is characterized in that an air inlet at the bottom of the kiln is provided with an air mixer, the air mixer is of a box type structure, an upper partition plate and a lower partition plate are arranged in a box body, gaps are formed between the lower partition plate and a front side plate of the box body and between the upper partition plate and a rear side plate of the box body to form a flow passage, the box body is divided into three layers by the upper partition plate and the lower partition plate, a smoke backflow chamber, a fresh air chamber and a mixed heating chamber are sequentially arranged from bottom to top, a heating device and a temperature sensor are arranged in the mixed heating chamber, 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 control valve;
the fresh air chamber and the smoke reflux chamber of the air mixer box body are respectively communicated with a fresh air pipeline and a smoke reflux pipeline, wherein a fresh air quantity regulating valve is arranged on the fresh air pipeline and a blower is connected to the tail end of the pipeline; a smoke reflux quantity regulating valve and an induced draft fan are sequentially arranged on the smoke reflux pipeline;
The system comprises a mixed air volume control valve, a fresh air volume control valve, a flue gas reflux volume control valve, a temperature sensor and a controller, wherein the mixed air volume control valve, the fresh air volume control valve, the flue gas reflux volume control valve and the controller of the DCS control system are electrically connected, a sensor for detecting the concentration of an O 2、CO、NOx component in flue gas and the temperature sensor in a mixed heating cavity respectively feed back acquired data to the controller of the DCS control system, and the controller is used for controlling the working states of the mixed air volume control valve, the fresh air volume control valve, the flue gas reflux volume control valve, a heating device, an induced draft fan and a blower;
The combustion method utilizing the tunnel kiln low-nitrogen combustion system comprises the following steps,
1) The system is started, the minimum to maximum opening of the mixed air volume control valve, the fresh air volume control valve and the smoke reflux volume control valve are manually adjusted, the respective maximum opening is set on a controller of the DCS control system, the minimum to maximum working frequencies of the blower and the induced draft fan are adjusted, and the maximum working frequency is determined to be set;
2) The opening of the mixed air quantity control valve, the fresh air quantity control valve and the flue gas reflux quantity control valve are adjusted, the opening of the mixed air quantity control valve is 100%, the opening of the fresh air quantity control valve is 70% -85%, and the opening of the flue gas reflux quantity control valve is 15% -50%;
3) The equipment of the system normally operates, and the flue gas reflux quantity and the fresh air quantity are ensured to be in a proportion of 15-35% by manually adjusting the opening and closing degree of each valve and matching with the variable frequency adjustment of the blower and the induced draft fan;
4) The opening degree of each valve is manually adjusted, a sensor for detecting the concentration of O 2、CO、NOx components in the smoke is arranged in a chimney, the minimum value which can be reached by the content of O 2、NOx discharged by combustion equipment is determined, and the target value setting of the content of O 2、NOx is set on a controller of a DCS control system;
5) The switching system is set to an automatic operation state, O 2 in the kiln is completed, and meanwhile, the emission of NOx in the flue gas is low;
A filter screen plate is arranged in the flue gas reflux chamber close to the flue gas reflux pipeline, and divides the front side of the flue gas reflux chamber into filter chambers;
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 smoke reflux chamber is close to the rear side plate of the box body;
The flue gas reflux chamber and the fresh air chamber are respectively provided with a rotating shaft, the outer wall of the rotating shaft is provided with a helical blade, 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 respectively coaxial with the center of the air inlet of the fresh air on the box body and the center of the air inlet of the flue gas reflux chamber;
The heating device in the mixed heating chamber is an electric heating device or a steam heating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910675528.1A CN110296601B (en) | 2019-07-25 | 2019-07-25 | Low-nitrogen combustion system of tunnel kiln |
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| CN201910675528.1A CN110296601B (en) | 2019-07-25 | 2019-07-25 | Low-nitrogen combustion system of tunnel kiln |
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| CN101762154A (en) * | 2009-12-25 | 2010-06-30 | 广东顺祥节能照明科技有限公司 | Energy-saving ceramic tunnel kiln |
| CN204678878U (en) * | 2015-06-08 | 2015-09-30 | 江川县上头营恒盛新型墙材有限公司 | A kind of portable annular tunnel kiln |
| CN105333728A (en) * | 2015-11-08 | 2016-02-17 | 广东工业大学 | Modular ceramic kiln energy-saving system of combined biomass gasifier |
| CN105387458A (en) * | 2015-12-04 | 2016-03-09 | 重庆川然节能技术有限公司 | System and method for reducing emission of oxynitride of combustion equipment |
| CN205825695U (en) * | 2016-07-30 | 2016-12-21 | 杭州至卓通讯科技有限公司 | A kind of combustion gas debinding furnace |
| CN206891155U (en) * | 2017-05-27 | 2018-01-16 | 广东嘉联企业陶瓷有限公司 | A kind of energy saving device for roller kilns |
| GB201713969D0 (en) * | 2017-08-31 | 2017-10-18 | Thermal Recycling (Uk) Ltd | Kiln Control |
| CN107677136A (en) * | 2017-09-18 | 2018-02-09 | 广东工业大学 | Furnace residual heat integrative recycling system |
| CN108662609A (en) * | 2018-05-21 | 2018-10-16 | 北京航天石化技术装备工程有限公司 | A kind of oxygen-enriched combusting heat-conducting oil furnace air and gas system |
| CN109519958A (en) * | 2018-12-28 | 2019-03-26 | 启明星宇节能科技股份有限公司 | The fresh air flue gas proportion adjustment equipment of low nitrogen burning |
| CN211120612U (en) * | 2019-07-25 | 2020-07-28 | 启明星宇节能科技股份有限公司 | Low-nitrogen combustion system of tunnel furnace |
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