CN201173677Y - Low-nitrous oxides pyrolysis furnace for cement industry - Google Patents
Low-nitrous oxides pyrolysis furnace for cement industry Download PDFInfo
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- CN201173677Y CN201173677Y CNU2007203114086U CN200720311408U CN201173677Y CN 201173677 Y CN201173677 Y CN 201173677Y CN U2007203114086 U CNU2007203114086 U CN U2007203114086U CN 200720311408 U CN200720311408 U CN 200720311408U CN 201173677 Y CN201173677 Y CN 201173677Y
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Abstract
The utility model relates to a low-nitrogen oxid decomposition furnace for the cement industry, which can decompose the nitrogen oxid under a high temperature and emits low Nox, can fit for different fuel, can cause part of materials to be calcined in a suspension mode, and has great energy-saving effect. The pyrogenetic decomposition furnace adopts the technical proposal that the upper part of a deposition furnace body is provided with a swirl combustion-supporting chamber; the lower part of the furnace body is provided with a swirl combustion chamber; the lower part of the swirl combustion chamber is provided with a reduction chamber; a raw meal feeding device and a fuel feeding device are arranged on the furnace body, the swirl combustion chamber and the reduction chamber; combustion devices are arranged on the reduction chamber, the swirl combustion chamber and the furnace body 3; a wind inlet device is arranged on the swirl combustion chamber and the swirl combustion-supporting chamber; the top part of the furnace body is provided with a furnace delivery wind pipe.
Description
One, technical field:
The utility model relates to a kind of cement industry dore furnace, is specifically related to a kind of cement industry low NOx pyrolysis furnace.
Two, background technology:
One of key equipment of suspension preheating predecomposition explained hereafter cement is a dore furnace, has formed the multiple representative type of furnace at present and has been used widely at world wide.But the raising that most of dore furnace is relatively paid attention to improving the CaCO3 resolution ratio and adapted to performances such as different fuel, the work of doing decomposition energy consumption aspect is obviously not enough especially how reducing aspect the reduction NOx.Prosperous Zhao of Huang Wen is that scholar's research such as benevolence are thought: temperature is high more, and the CaCO3 decomposition rate is fast more; The material rate of warming is fast more, and the CaCO3 decomposition rate is fast more; The CaCO3 decomposition temperature is high more, and it is more little to decompose free energy.So, improve the dore furnace operating temperature, improve fuel combustion speed, improve the gas-solid rate of heat exchange, accelerate the material programming rate, can improve the dore furnace productive rate, cut down the consumption of energy.Dore furnace material decomposition temperature is controlled between 820-850 ℃ usually at present, make decomposition temperature reach 900 ℃ or above and maintenance heat absorption and exothermic equilibrium, and existing dore furnace comes with some shortcomings.In addition, environmental protection is more and more higher to the requirement of cement industry discharging NOx; Using cheap fuel also is the inevitable requirement of technology in cement industry development.
Three, utility model content:
The utility model provides a kind of cement industry low NOx pyrolysis furnace in order to solve the weak point in the above-mentioned background technology, its energy pyrolytic, and low NOx drainage adapts to different fuel, can make partial material by suspension calcining, and energy-saving effect is remarkable.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of cement industry low NOx pyrolysis furnace, comprise body of heater 3, it is characterized in that: be provided with eddy current combustion-supporting chamber 4 in described upper of furnace body, body of heater 3 bottoms are provided with turbulence chamber 2, turbulence chamber 2 bottoms are provided with reduction chamber 1, on body of heater 3, turbulence chamber 2 and the reduction chamber 1 raw material drawing-in device and fuel-feed device are housed, on reduction chamber 1, turbulence chamber 2 and the body of heater 3 burner are housed.
Be provided with in above-mentioned turbulence chamber 2 and the eddy current combustion-supporting chamber 4 air-intake device can be arranged.
Be connected between above-mentioned turbulence chamber 2 and the body of heater 3, the air-intake device on the turbulence chamber 2 is the unidirectional of different angles or multi-way air-inlet device.
Above-mentioned reduction chamber 1 is a truncated cone-shaped or cylindrical, or truncated cone-shaped and columniform combination, and reduction is equipped with raw material and fuel-feed device on the chamber.
Air-intake device in the above-mentioned eddy current combustion-supporting chamber 4 is the unidirectional or multi-way air-inlet device that is connected with body of heater 3 with different angles.
Above-mentioned body of heater 3 tops are provided with the airduct 5 of coming out of the stove.
Above-mentioned body of heater 3 can be with reducing or not be with reducing.
The utility model with respect to the advantage of prior art is:
1, reducing nitrogen oxide produces;
2, the initial temperature height of CaCO3 decomposition, the material firing rate is fast, helps improving the CaCO3 decomposition rate and reduces CaCO3 decomposition free energy.Stove resolution ratio height is realized energy-conservation and volume increase.
3, strong to low-grade fuel and low-volatile coal combustion adaptive.
4, can generate grog " crystal seed ", can make kiln system play the energy-saving and production-increase effect of " mixing the crystal seed burning clinker ".
Four, description of drawings:
Of the present utility model a kind of structural representation that Fig. 1 is;
Fig. 2 is the schematic diagram of a kind of distressed structure of the present utility model;
Fig. 3 is the schematic diagram of another kind of distressed structure of the present utility model.
Among the figure, 1-reduces the chamber, 2-turbulence chamber, 3-body of heater, 4-eddy current combustion-supporting chamber, the 5-airduct of coming out of the stove, 6-smoke-box, 7-cement rotary kiln.
Five, the specific embodiment:
The utility model serve as reasons reduction chamber 1, turbulence chamber 2, body of heater 3, eddy current combustion-supporting chamber 4, go out the dore furnace that boiler tube 5 etc. is formed, raw material drawing-in device and burner are housed on the dore furnace.Adopt fuel, raw material and combustion air adding form, realize the multipole burning of fuel, the multistage heating of raw material in body of heater different parts and controlled quantity.Form the zone of several difference in functionalitys such as reducing zone, high-temperature region, resolver and after-combustion resolver.Referring to Fig. 1, be provided with eddy current combustion-supporting chamber 4 on body of heater 3 tops, eddy current combustion-supporting chamber 4 can be the parts that independently are connected with dore furnace, also comprises the unidirectional or multi-way air-inlet device of dore furnace tertiary air different angles; Body of heater 3 bottoms are provided with turbulence chamber 2, turbulence chamber 2 can be the parts that independently are connected with dore furnace, also comprise the unidirectional of different angles or multi-way air-inlet device, turbulence chamber 2 bottoms are provided with reduction chamber 1, reduction chamber 1 is a truncated cone-shaped or cylindrical, or truncated cone-shaped and columniform combination.On body of heater 3, turbulence chamber 2 and the reduction chamber 1 raw material drawing-in device and fuel-feed device are housed, a raw material part adds from reduction chamber 1, and a part adds from the body of heater 3 of turbulence chamber 2 tops, perhaps adds from turbulence chamber 2.A fuel part adds from reduction chamber 1, and a part adds or adds from the body of heater 3 of turbulence chamber 2 tops from turbulence chamber 2, and perhaps the body of heater 3 from turbulence chamber 2 and turbulence chamber 2 tops adds simultaneously; On reduction chamber 1, turbulence chamber 2 or the body of heater 3 burner is housed, turbulence chamber 2 and eddy current combustion-supporting chamber 4 are provided with air-intake device, a combustion air part adds by turbulence chamber 2, another part adds by the eddy current combustion-supporting chamber on the body of heater 34, what enter turbulence chamber 2 is the tertiary air of kiln, what enter eddy current combustion-supporting chamber 4 can be tertiary air, also can be the air of the higher temperature introduced from kiln hood or cooler separately, can also be oxygen content greater than 20.9% oxygen rich gas; Eddy current combustion-supporting chamber 4 tops are provided with the airduct 5 of coming out of the stove, and the airduct of coming out of the stove adopts top air-out form, and the airduct 5 of coming out of the stove can insert or not insert in the stove and be connected with stove.Body of heater 3 can be with reducing or not be with reducing.Fig. 1 is a kind of version of the present utility model, and the utility model can have various deformation, all within protection domain of the present utility model.
The dore furnace course of work is: a part of fuel sprays into the reduction chamber 1 and the mixed combustion of kiln discharge waste gas of furnace bottom, and a part of raw material also add from here.Because of this less reducing zone that forms of oxygen content, district, fuel burns under reducing atmosphere, can produce high concentration reducing gas CO, H2, CH4, and the NOx in the kiln gas is reduced to harmless N2.Fe2O3 during reaction in the raw material, Al2O3 play the catalyst action of denitration.The high temperature tertiary air enters in the dore furnace by turbulence chamber, and most of fuel is by at first with high temperature tertiary air contacting mixed combustion after spraying into herein.Because the temperature height, the oxygen content height, so, fuel easy fight burning back and the further mixed combustion of kiln tail high-temperature flue gas rapidly.Temperature is higher herein, is called the high-temperature region.The high-temperature region is fuel ignition, conflagration, and supply CaCO3 decomposes institute's calorific requirement, provides one well to accumulate bed, also can make CaCO3 decomposition initial temperature higher.Simultaneously, fuel at high temperature burns and can produce less relatively NOx.
(small part) raw material CaCO3 high-temperature gas that adds from the reduction chamber decomposes, and enters high-temperature region suspension calcination with high-temperature gas, and local temperature can reach 1200-1300 ℃ or higher in the high-temperature region, and partial material is sintered, and forms grog " crystal seed ".The main body raw material are from the high-temperature region, or after its top adds dore furnace and high-temperature gas contact, can make the raw material rate of warming very fast and can at high temperature decompose, and this distinguishes is pyrolysis zone.Along with fuel constantly burns, oxygen content constantly reduces in the gas, and CaCO3 divides heat of desorption in addition, and gas temperature has downward trend.At this moment, the high-temperature gas by eddy current combustion-supporting chamber adds had both replenished oxygen and had also replenished heat, can help the fuel after-flame that burns away.Stove inside vortex air-flow fluidised form is strengthened in combustion-supporting gas adding simultaneously again, helps conducting heat, and this district is the after-combustion resolver.The mode that gas adopts the top to come out of the stove can make the dore furnace dischargeable capacity be fully used, and airduct inserts in the stove, can increase the material back-mixing, increases heat transfer efficiency.The volume of reducing zone suitably enlarges, and the one, prevent that skinning from taking place, two can provide the fuel combustion requisite space, increase burning time.This dore furnace is operated and should be noted reducing chamber skinning, the material that collapses, high-temperature region hot-spot and skinning.
During real work, high-temperature kiln gas enters dore furnace reduction chamber 1 by smoke-box 6, and part of fuel is added into reduction chamber 1 and kiln gas mixed combustion.(small part) raw material of Jia Ruing CaCO3 in high-temperature gas decomposes herein, and enters the high-temperature region with high-temperature gas.Tertiary air enters dore furnace by turbulence chamber 2, coal dust be added into the swirl combustion district at first with tertiary air mixed combustion, then and come the high-temperature gas of autoreduction chamber to mix further burning forms the high-temperature region.Partial material in the high-temperature region is formed grog " crystal seed " by suspension calcining.Most of material can carry out heat exchange with gas under higher temperature after the high-temperature region adds; By the high-temperature gas that eddy current combustion-supporting chamber 4 adds, can help the fuel after-flame that burns away.Strengthen gas stream in the stove vortex fluidised form simultaneously, help conducting heat.Reaction mass enters subordinate preheater with the discharge pipe 5 of gas by furnace roof portion.
Structure shown in Figure 2 is a kind of distortion of the present utility model, and the structure of turbulence chamber 2 changes to some extent, is more suitable for using low-volatile coal and low-grade fuel.Structure shown in Figure 3 is another distortion of the present utility model, and the angle of the air-intake device in the eddy current combustion-supporting chamber 4 changes to some extent.
Claims (7)
1. cement industry low NOx pyrolysis furnace, comprise body of heater (3), it is characterized in that: be provided with eddy current combustion-supporting chamber (4) on described body of heater (3) top, body of heater (3) bottom is provided with turbulence chamber (2), turbulence chamber (2) bottom is provided with reduction chamber (1), on body of heater (3), turbulence chamber (2) and the reduction chamber (1) raw material drawing-in device and fuel-feed device are housed, on reduction chamber (1), turbulence chamber (4) and the body of heater (3) burner are housed.
2. cement industry low NOx pyrolysis furnace according to claim 1 is characterized in that: described turbulence chamber (2) and eddy current combustion-supporting chamber (4) are provided with air-intake device.
3. cement industry low NOx pyrolysis furnace according to claim 2 is characterized in that: be connected between described turbulence chamber (2) and the body of heater (3), the air-intake device on the turbulence chamber (2) is the unidirectional of different angles or multi-way air-inlet device.
4. cement industry low NOx pyrolysis furnace according to claim 2 is characterized in that: the unidirectional or multi-way air-inlet device of the air-intake device in the described eddy current combustion-supporting chamber (4) for being connected with body of heater with different angles.
5. according to claim 1,2,3 or 4 described cement industry low NOx pyrolysis furnaces, it is characterized in that: described reduction chamber (1) is truncated cone-shaped or cylindrical, or truncated cone-shaped and columniform combination, on the reduction chamber (1) raw material and fuel-feed device are housed.
6. according to claim 1,2,3 or 4 described cement industry low NOx pyrolysis furnaces, it is characterized in that: described body of heater (3) top is provided with the airduct of coming out of the stove (5).
7. according to claim 1,2,3 or 4 described cement industry low NOx pyrolysis furnaces, it is characterized in that: described body of heater (3) has reducing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203114086U CN201173677Y (en) | 2007-12-25 | 2007-12-25 | Low-nitrous oxides pyrolysis furnace for cement industry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203114086U CN201173677Y (en) | 2007-12-25 | 2007-12-25 | Low-nitrous oxides pyrolysis furnace for cement industry |
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| CN201173677Y true CN201173677Y (en) | 2008-12-31 |
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| CNU2007203114086U Expired - Fee Related CN201173677Y (en) | 2007-12-25 | 2007-12-25 | Low-nitrous oxides pyrolysis furnace for cement industry |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466229A (en) * | 2010-11-05 | 2012-05-23 | 川崎重工业株式会社 | Waste processing equipment for introducing thermolysis gas of waste into cement decomposition furnace |
| CN102080926B (en) * | 2009-11-30 | 2012-10-24 | 华新水泥股份有限公司 | High-efficiency environmentally-friendly predecomposition furnace |
| CN103206865A (en) * | 2013-03-22 | 2013-07-17 | 上海三融环保工程有限公司 | Efficient reburning denitrification device and technical method |
| CN104864704A (en) * | 2014-02-20 | 2015-08-26 | 南京圣火水泥新技术工程有限公司 | Cement kiln decomposing furnace with low-nitrogen type on-line rotational flow prechamber |
| CN105784537A (en) * | 2016-03-18 | 2016-07-20 | 武汉理工大学 | Experimental method and experimental system for simulation of staged combustion of decomposing furnace |
| CN110360843A (en) * | 2019-07-31 | 2019-10-22 | 中国科学院力学研究所 | A kind of cement decomposing furnace coal dust high-efficiency gasification low-NO_x combustion technology device |
| CN110763018A (en) * | 2019-09-20 | 2020-02-07 | 沈忠东 | Decomposing furnace with local directional combustion supporting function |
-
2007
- 2007-12-25 CN CNU2007203114086U patent/CN201173677Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080926B (en) * | 2009-11-30 | 2012-10-24 | 华新水泥股份有限公司 | High-efficiency environmentally-friendly predecomposition furnace |
| CN102466229A (en) * | 2010-11-05 | 2012-05-23 | 川崎重工业株式会社 | Waste processing equipment for introducing thermolysis gas of waste into cement decomposition furnace |
| CN102466229B (en) * | 2010-11-05 | 2014-04-02 | 川崎重工业株式会社 | Waste processing equipment for introducing thermolysis gas of waste into cement decomposition furnace |
| CN103206865A (en) * | 2013-03-22 | 2013-07-17 | 上海三融环保工程有限公司 | Efficient reburning denitrification device and technical method |
| CN103206865B (en) * | 2013-03-22 | 2015-09-30 | 上海三融环保工程有限公司 | Efficient denitration by refueling device and process |
| CN104864704A (en) * | 2014-02-20 | 2015-08-26 | 南京圣火水泥新技术工程有限公司 | Cement kiln decomposing furnace with low-nitrogen type on-line rotational flow prechamber |
| CN105784537A (en) * | 2016-03-18 | 2016-07-20 | 武汉理工大学 | Experimental method and experimental system for simulation of staged combustion of decomposing furnace |
| CN105784537B (en) * | 2016-03-18 | 2018-11-13 | 武汉理工大学 | A kind of experimental system and method for simulation dore furnace fractional combustion |
| CN110360843A (en) * | 2019-07-31 | 2019-10-22 | 中国科学院力学研究所 | A kind of cement decomposing furnace coal dust high-efficiency gasification low-NO_x combustion technology device |
| CN110763018A (en) * | 2019-09-20 | 2020-02-07 | 沈忠东 | Decomposing furnace with local directional combustion supporting function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081231 Termination date: 20100125 |