CN210079210U - Improved generation extrakiln decomposition dry process cement kiln hot carbon reduction high-efficient deNOx systems - Google Patents
Improved generation extrakiln decomposition dry process cement kiln hot carbon reduction high-efficient deNOx systems Download PDFInfo
- Publication number
- CN210079210U CN210079210U CN201920559010.7U CN201920559010U CN210079210U CN 210079210 U CN210079210 U CN 210079210U CN 201920559010 U CN201920559010 U CN 201920559010U CN 210079210 U CN210079210 U CN 210079210U
- Authority
- CN
- China
- Prior art keywords
- port
- pipe
- discharge valve
- induced
- induced draft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model discloses an improved kiln outside decomposition dry method cement kiln hot carbon reduction high-efficiency denitration system, wherein a high-temperature gravity discharge valve is arranged at a conical reducing port at the bottom of a decomposing furnace, one or two induced ducts are arranged at the conical side surface at the bottom of the decomposing furnace, and the induced ducts firstly ascend at a large inclination after coming out from the bottom of the decomposing furnace and then descend and lead to the vicinity of a tertiary air inlet at the bottom of the decomposing furnace; one port of the U-shaped induced duct is positioned above the high-temperature gravity discharge valve, the other port is positioned below the high-temperature gravity discharge valve, and the length of the induced duct can be regulated; the coal injection pipe and the raw material injection pipe are respectively connected to one side pipe below the induced draft pipe, and the raw material injection port is positioned at the upwind position of the coal injection port; the other end of the coal injection pipe is connected with a pulverized coal bin and a quantitative feeder; the tertiary air inlet is positioned between the high-temperature gravity discharge valve and one port of the induced draft pipe, the reduction zone of the system for denitration reaction is positioned outside the decomposing furnace, the denitration efficiency is regulated and controlled by adjusting the length of the reduction zone, the combustion effect and the cement quality of the decomposing furnace are not influenced, the size of the reduction zone of the system is easy to adjust, the safety of the operation process is good, and the denitration efficiency is high.
Description
Technical Field
The utility model relates to a high-efficient deNOx systems of improved generation extrakiln decomposition dry process cement kiln hot carbon reduction belongs to environmental protection technical field. The technical proposal related to the utility model is filed on the same day.
Background
At present, the international and domestic society has stronger and stronger environmental protection call, so the problem of nitrogen oxide emission in cement production is also concerned widely. China promulgates the discharge standard of atmospheric pollutants in the cement industry in 2013, and has stricter requirements on the discharge of nitrogen oxides in the cement industry, namely the maximum discharge of the nitrogen oxides is required to be not more than 400mg/m3Some key areas even not exceeding 100mg/m3。
In the aspect of cement production, China cement production enterprises mostly adopt SNCR, SCR and hot carbon reduction denitration technologies to realize removal of nitrogen oxides. The rotary kiln and the decomposing furnace are two thermal devices in a cement production system and are also devices for generating nitrogen oxides; in the rotary kiln, the pulverized coal is combusted at high temperature to generate a large amount of thermal NOx and fuel NOx; although the temperature in the decomposing furnace is lower than that of the rotary kiln, a large amount of fuel type NOx can be generated by the coal powder injected into the decomposing furnace; the denitration process of cement production is mainly completed in a decomposing furnace.
The patent publication No. CN102745920A discloses a thermal carbon reduction denitration technology for a cement kiln by an out-of-kiln decomposition dry method, which comprises the steps of spraying coal powder into a specific position of a decomposition furnace to form a reduction zone, generating a reduction atmosphere under the condition of oxygen deficiency, and reducing part of nitrogen oxides generated in the decomposition furnace and a rotary kiln. However, this technique has a drawback in that the length of the reduction zone formed is limited by the height of the decomposing furnace, and the size of the reduction zone is not easily adjusted, so that the actual denitration efficiency is limited. Although the denitration efficiency can be improved by increasing the length of the reduction zone in the decomposing furnace, the denitration efficiency is improved, and the temperature distribution in the decomposing furnace and the sintering quality of cement clinker are influenced.
In order to solve the limited problem of denitration efficiency among the current cement kiln hot carbon reduction denitration technique, the utility model discloses the inventor has provided a high-efficient deNOx systems of two side induced air type kiln outer decomposition dry process cement kiln hot carbon reduction, and the reduction zone that denitration reaction took place in this technique is located outside the dore, realizes the regulation and control of denitration efficiency through the length of adjusting the reduction zone, does not influence the combustion effect and the cement quality of dore.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high-efficient deNOx systems of improved generation extrakiln decomposition dry process cement kiln hot carbon reduction.
The utility model discloses denitration system includes decomposing furnace (1), rotary kiln (4), buggy storehouse (5), doser (6), coal injection pipe (7), raw material spout pipe (8), tertiary air import (9), the toper throat of the bottom of decomposing furnace (1) of this system is provided with high temperature gravity discharge valve (2), still set up two symmetrical induced ducts (3) in the conical side in decomposing furnace bottom, induced duct (3) are the U type, go up and then descend and lead to near that lie in decomposing furnace bottom tertiary air import (9) first the big inclination after coming out of decomposing furnace bottom toper department; one port of the U-shaped part is positioned above the high-temperature gravity discharge valve (2), and the other port of the U-shaped part is positioned below the high-temperature gravity discharge valve (2); the tertiary air inlet (9) is positioned between the high-temperature gravity discharge valve (2) and one port of the induced draft pipe (3); the length of the induced draft pipe (3) can be regulated; the coal injection pipe (7) and the raw material injection pipe (8) are respectively connected to one side pipe below the U-shaped induced draft pipe (3) and communicated with the induced draft pipe (3); the raw material injection pipe (8) is positioned at the upwind position of the coal injection pipe (7); the other end of the coal injection pipe (7) is connected with a pulverized coal bunker (5) and a quantitative feeder (6). When the utility model is used, the kiln wind in the rotary kiln (4) enters the decomposing furnace (1) from the induced draft tube (3) positioned on the side surface of the lower part of the conical necking due to the limiting function of the high-temperature gravity discharge valve (2); at the moment, pulverized coal and raw materials are sprayed into the induced draft tube (3) through a coal spraying tube (7) and a raw material spraying tube (8) which are connected with the induced draft tube (3), a reduction region A is formed in the induced draft tube (3), an oxygen-deficient combustion environment is created, a thermal carbon reduction denitration reaction is carried out, and a large amount of NOx in flue gas is removed.
The coal powder is sprayed into the spray head of the induced draft pipe (3) through the coal spraying pipe (7) and distributed in a sector shape, the direction and the angle can be adjusted, and the coal powder can be uniformly sprayed into the induced draft pipe.
In order to further obtain a better denitration effect, it is preferable that:
the included angle between the ascending section of the induced draft pipe (3) and the horizontal plane is more than or equal to 30 degrees.
The length of the induced draft pipe (3) is such that the retention time of the pulverized coal in the reduction zone A can be kept to be more than 3 seconds.
The utility model has the advantages and the characteristics that:
1. compared with the prior art, the utility model can improve the denitration efficiency and simultaneously can not generate any adverse effect on the efficiency of the decomposing furnace and the cement quality;
2. the utility model discloses adjust the size of reducing zone easily, the operation process security is good, and the denitration is efficient.
3. The utility model discloses transformation to cement kiln is less, implements simply, and the investment is little, construction and running cost are low.
Drawings
Fig. 1 is a schematic structural diagram of the present invention. Wherein:
1. a decomposing furnace; 2. a high temperature gravity discharge valve; 3. an induced draft pipe; 4. a rotary kiln; 5. a pulverized coal bunker; 6. a doser; 7. a coal injection pipe; 8. raw material is sprayed into the tube; 9. tertiary air inlet
Detailed Description
For a better understanding of the present invention, the following description is given with reference to the accompanying drawings without limiting the present invention.
The structure of the utility model is shown in figure 1. Calcium carbonate is decomposed after the raw materials are subjected to high temperature in a decomposing furnace (1) and falls on a high-temperature gravity discharge valve (2), when the weight of the falling raw materials reaches a threshold value, the high-temperature gravity discharge valve (2) is opened, and the raw materials enter a cement rotary kiln (4) to be burned into clinker; kiln wind in the cement rotary kiln (4) moves along the arrow direction, and the kiln wind is blocked by the high-temperature gravity discharge valve (2) and enters the induced draft tube (3). The induced draft pipe (3) of the system is composed of an inner layer and an outer layer, the inner layer pipe is made of high-temperature fire-resistant heat-insulation bricks, the outer layer pipe is made of high-temperature-resistant steel, the outer layer pipe is formed by connecting a plurality of short pipes in a segmented mode, the included angle between the ascending section of the induced draft pipe (3) and the horizontal plane is 30 degrees, and the length of the induced draft pipe (3) is adjusted to enable the retention time of pulverized coal in a reduction area A to exceed 3 seconds. The coal dust in the coal dust bin (5) is metered by a quantitative feeder (6) and then is sprayed into the induced draft tube (3) through a coal spraying tube (7), and simultaneously, the raw material from the 4-stage preheater is also sprayed into the induced draft tube (3) through a raw material spraying tube (8), and at the moment, a reduction area A is formed in the induced draft tube (3); because of the oxygen-poor combustion environment of the reduction zone A, a large amount of NOx in the flue gas is removed, and because the retention time of the pulverized coal in the reduction zone A is long, the NOx is fully reduced. The nozzles at the joints of the coal injection pipe (7) and the induced draft pipe (3) of the system are distributed in a sector shape, the direction and the angle can be adjusted, and the coal powder can be uniformly injected into the induced draft pipe.
Then, the kiln air in the draft tube (3) enters the decomposition furnace (1) from a port near the lower throat of the decomposition furnace (1), and the unburned coal powder is burned out.
Claims (3)
1. An improved cement kiln hot carbon reduction efficient denitration system adopting an external decomposition dry method comprises a decomposition furnace, a rotary kiln, a pulverized coal bin, a quantitative feeder, a coal injection pipe, a raw material injection pipe and a tertiary air inlet, and is characterized in that a high-temperature gravity discharge valve is arranged at a conical reducing port at the bottom of the decomposition furnace, and one or two induced air pipes are arranged on the conical side surface at the bottom of the decomposition furnace; the induced draft tube is U-shaped, the induced draft tube firstly ascends at a large inclination after coming out of the bottom of the decomposing furnace and then descends and leads to the vicinity of a tertiary air inlet positioned at the bottom of the decomposing furnace, and the included angle between the ascending section of the induced draft tube and the horizontal plane is more than or equal to 30 degrees; one port of the U-shaped induced duct is positioned above the high-temperature gravity discharge valve, the other port is positioned below the high-temperature gravity discharge valve, and the length of the induced duct can be regulated; the coal injection pipe and the raw material injection pipe are respectively connected to one side pipe below the induced draft pipe, and the raw material injection port is positioned at the upwind position of the coal injection port; the other end of the coal injection pipe is connected with a pulverized coal bin and a quantitative feeder; the tertiary air inlet is arranged between the high-temperature gravity discharge valve and one port of the induced draft tube.
2. The improved hot carbon reduction high-efficiency denitration system for the cement kiln adopting the dry method of decomposing outside the kiln as claimed in claim 1, wherein the length of the induced draft tube is such that the retention time of the pulverized coal in the reduction zone A can be kept to be more than 3 seconds.
3. The improved hot carbon reduction high-efficiency denitration system for the cement kiln adopting the dry method of decomposing outside the kiln as claimed in claim 1, wherein pulverized coal is sprayed into the nozzle of the air guiding pipe through the coal spraying pipe, and the nozzle is distributed in a sector shape, can adjust the direction and the angle, and can be uniformly sprayed into the air guiding pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920559010.7U CN210079210U (en) | 2019-04-23 | 2019-04-23 | Improved generation extrakiln decomposition dry process cement kiln hot carbon reduction high-efficient deNOx systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920559010.7U CN210079210U (en) | 2019-04-23 | 2019-04-23 | Improved generation extrakiln decomposition dry process cement kiln hot carbon reduction high-efficient deNOx systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210079210U true CN210079210U (en) | 2020-02-18 |
Family
ID=69475795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920559010.7U Active CN210079210U (en) | 2019-04-23 | 2019-04-23 | Improved generation extrakiln decomposition dry process cement kiln hot carbon reduction high-efficient deNOx systems |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210079210U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109985500A (en) * | 2019-04-23 | 2019-07-09 | 天津朝阳环保科技集团有限公司 | A kind of hot carbon reduction NO_x Reduction by Effective system of modified precalcining dry-process cement rotary kiln |
-
2019
- 2019-04-23 CN CN201920559010.7U patent/CN210079210U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109985500A (en) * | 2019-04-23 | 2019-07-09 | 天津朝阳环保科技集团有限公司 | A kind of hot carbon reduction NO_x Reduction by Effective system of modified precalcining dry-process cement rotary kiln |
| CN109985500B (en) * | 2019-04-23 | 2024-06-21 | 天津朝阳环保科技集团有限公司 | Improved kiln external decomposition dry-method cement kiln thermal carbon reduction efficient denitration system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102179171B (en) | Multi-stage themolysis coupled denitration method using front flow field uniformizing device and device thereof | |
| CN101761928A (en) | Incineration treatment method for domestic refuse | |
| CN101761920A (en) | Method and device for burning low NOx by utilizing reburning of pulverized coal pyrolysis gas | |
| CN111964435B (en) | Pulverized coal decoupling combustion reduction NO of cement decomposing furnace x Exhaust system and method | |
| CN102923979A (en) | Clinker production line for novel dry process cement kiln and denitration process method for clinker production line | |
| CN102703157B (en) | Multi-product cleaning and producing method with coal gangue comprehensive utilization | |
| CN111140865B (en) | Composite reduction type low NOx emission device suitable for utility boiler | |
| CN210079210U (en) | Improved generation extrakiln decomposition dry process cement kiln hot carbon reduction high-efficient deNOx systems | |
| CN206330425U (en) | Cement industry dore furnace | |
| CN210121415U (en) | Efficient denitration system for hot carbon reduction of double-side air-induced type kiln external decomposition dry-method cement kiln | |
| CN203731858U (en) | Novel kiln tail decomposing furnace device of cement clinker production line | |
| CN110925747A (en) | Combustion device convenient for reducing NOx by directly spraying coal water slurry into low-oxygen flame | |
| CN206858496U (en) | A kind of activating and reducing combustion with meagre oxygen system | |
| CN211084104U (en) | Composite reduction type low NOx emission device suitable for power station boiler | |
| CN105727731A (en) | Desulfurization system and desulfurization method for improving boiler efficiency | |
| CN216644939U (en) | Deep denitration system of dry cement production line | |
| CN211502750U (en) | Combustion device convenient for reducing NOx by directly spraying coal water slurry into low-oxygen flame | |
| CN204345619U (en) | A kind of burner reducing nitrogen oxide emission | |
| CN109985500B (en) | Improved kiln external decomposition dry-method cement kiln thermal carbon reduction efficient denitration system | |
| CN109631020A (en) | Combine denitrification apparatus in a kind of full load furnace suitable for industrial coal powder boiler | |
| CN109058983A (en) | Recirculating fluidized bed combustion with meagre oxygen catalysis oxidation fractional combustion boiler system and method | |
| CN206152638U (en) | SCR deNOx systems | |
| CN101367536A (en) | Method and decomposition stove for preparing lime in suspended state with wood coal as fuel | |
| CN113108606A (en) | Denitration device between cement kiln tail smoke chamber and decomposing furnace | |
| CN102745920B (en) | Technique for dry method cement kiln carbon thermal reduction and denitration by out-kiln decomposition |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |