CN210332267U - Flue gas denitration system for calcination of alumina clinker kiln - Google Patents
Flue gas denitration system for calcination of alumina clinker kiln Download PDFInfo
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- CN210332267U CN210332267U CN201920068365.6U CN201920068365U CN210332267U CN 210332267 U CN210332267 U CN 210332267U CN 201920068365 U CN201920068365 U CN 201920068365U CN 210332267 U CN210332267 U CN 210332267U
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Abstract
The utility model provides an alumina clinker kiln calcines flue gas denitration system, including clinker kiln, cooler, universal rotary conveyor, denitrifier surge bin, ration feeder, denitrifier pipeline, three-legged mount, spray gun, roots's fan, cyclone, electric dust collection, smoke exhaust fan and chimney, denitration reductant utilizes compressed air to carry through ration feeder, gets into from the kiln tail center part of the kiln body, carries out three at kiln tail certain distance position and puts and carry out three denitration reducing agentsPositioning a foot fixing frame, leading a denitration agent conveying pipeline out of the kiln body along the fixing frame, extending along the direction of a kiln head of the kiln body, arranging points in a high-temperature area in the kiln, arranging a spray gun on the annular kiln body, spraying a reducing agent into the high-temperature area of a clinker kiln body through the spray gun, completely pyrolyzing the denitration agent to generate a gaseous hydrocarbon reducing agent, and reducing NOx into N when NOx generated in the combustion process meets gaseous hydrocarbon2And H2And O, conveying the denitrated flue gas to a chimney for evacuation through a dust removal device system and finally conveying the standard flue gas to the chimney by a smoke exhaust fan.
Description
Technical Field
The utility model belongs to the environmental protection field, concretely relates to flue gas denitration system is calcined to aluminium oxide grog kiln.
Background
The clinker firing is a key process of alumina production by a sintering method, and has the functions of firing the prepared raw slurry into solid sodium aluminate clinker which is easy to dissolve through a rotary kiln, discharging waste gas generated by fuel combustion into the atmosphere after three-level dust collection by gravity, cyclone and static electricity, and conveying the clinker into a clinker bin. The clinker sintering production is centered on a rotary kiln, and the sintering temperature is about 1300 ℃. The rotary kiln is characterized by that the refractory brick lining and heat-exchange device are placed in the cylinder body, and can be rotated at low speed, and the material and hot flue gas are generally counter-current heat-exchanged, and the material can be fed into the kiln from high end of the kiln (also called cold end or tail end of the kiln).
The simple production process of clinker kiln sintering is as follows: pulverized coal is sprayed into a kiln head combustion chamber from a kiln head by an air blower (primary air) to be combusted, the whole kiln is heated, raw materials (raw materials) for production are sprayed into a kiln body from a tail end (high end) of a rotary kiln, move to a kiln head end (low end) along with the rotation of the kiln, are continuously heated, and finally generate clinker (products) through a series of physical and chemical changes, and enter a cooling machine from the kiln head end to be cooled and recovered. The burned smoke and partial lost raw materials are treated by a kiln tail dust collecting and smoke exhausting device, and kiln dust is returned to the kiln for reuse. The dust-collecting smoke-discharging equipment is equipped with induced draft fan (secondary air), and can regulate air quantity, and the interior of kiln is formed into an integrated air flow channel by means of cooling machine, kiln and induced draft fan.
After the furnace burden enters the kiln, the furnace burden is gradually heated in the process of moving from the tail of the kiln to the head of the kiln, a series of physical and chemical changes occur in sequence, and according to the characteristics of the physical and chemical changes of the furnace burden at each section, the furnace burden is divided into four bands from the tail of the kiln to the head, namely a drying band, a preheating decomposition band, a sintering band and a cooling band in sequence.
The sintering zone of the alumina clinker kiln generates nitrogen oxides, which cause the nitrogen oxides in the dedusting exhaust flue gas to exceed the standard, and the nitrogen oxides can be exhausted only by treatment, so that the denitration system for the calcining flue gas of the alumina clinker kiln is provided for denitration and purification in the kiln.
SUMMERY OF THE UTILITY MODEL
The utility model provides an alumina clinker kiln calcination flue gas denitration system for solving above-mentioned technical problem, specific technical scheme is:
a denitration system for flue gas generated by calcining an alumina clinker kiln comprises a kiln body, a denitration agent supply device and a spraying denitration device, wherein the denitration agent supply device is connected with a universal conveyor, the universal conveyor is connected with a denitration agent conveying pipeline arranged in the kiln body, the denitration agent conveying pipeline extends out of the kiln body through one of three-leg fixing frames, and the spraying denitration device is arranged outside the kiln body in a surrounding manner and is connected with the denitration agent conveying pipeline;
further, the denitration agent supply device comprises a denitration agent buffer bin, a quantitative feeder and a Roots blower, wherein a discharge hole of the denitration agent buffer bin is connected with an inlet of the quantitative feeder, and the Roots blower is connected with an air inlet of the quantitative feeder;
furthermore, the jet denitration device comprises a frame pipeline 14 arranged outside the kiln body in a surrounding mode and n spray guns arranged on outlets of the frame pipeline 14, inlets of the frame pipeline 14 are connected with the denitration agent conveying pipeline, and the spray guns are uniformly distributed around the transverse section surface of the kiln body;
further, the universal conveyor drives the denitration agent conveying pipeline to rotate relative to the kiln body;
further, the three-leg fixing frame is arranged at a position 6-25 meters away from the kiln tail of the kiln body;
further, the number of the frames is 1-4 groups;
furthermore, the number n of the spray guns is 1-6;
further, the kiln comprises a cooling machine connected with the kiln head of the kiln body;
the device further comprises a dust removal system, wherein the dust removal system comprises a vertical flue arranged at the tail of the kiln body, a cyclone dust removal unit connected with the vertical flue and an electric dust removal unit connected with the cyclone dust removal unit;
further, the device also comprises a smoke exhaust system connected with the dust removal system, wherein the smoke exhaust system comprises a smoke exhaust fan connected with the dust removal system and a chimney connected with the smoke exhaust fan.
The utility model discloses utilize alumina clinker kiln high temperature area to spout denitration reductant to nitrogen gas with nitrogen oxide reduction, set up the tripod mount through the kiln tail from the kiln body and fix a position, high temperature region stationing in the kiln, the ring kiln body sets up the spray gun, spouts the reductant into the high temperature area of clinker kiln by the spray gun, and the complete pyrolysis of denitrifier generates gaseous hydrocarbon reductant, realizes the purpose that the denitration purifies, reaches the effect of smoke emission environmental protection requirement.
Drawings
FIG. 1 is a schematic structural view of a denitration system for flue gas generated by calcining an alumina clinker kiln;
FIG. 2 is a sectional view of the kiln body of the present invention;
FIG. 3 is a schematic structural view of the arrangement of the jet denitration device of the utility model,
in the figure: the device comprises a kiln body 1, a cooler 2, a universal rotary conveyor 3, a quantitative feeder 4, a denitrifier buffer bin 5, a Roots blower 6, a three-foot fixing frame 7, a spray gun 8, a denitrifier conveying pipeline 9, a cyclone dust removal unit 10, an electric dust collection unit 11, a smoke exhaust blower 12, a chimney 13 and a frame pipeline 14.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model discloses an alumina clinker kiln calcines flue gas denitration system includes the clinker kiln body 1, cooler 2, universal rotary conveyor 3, denitrifier surge bin 5, quantitative feeder 4, denitrifier pipeline 9, tripod mount 7, spray gun 8, roots's fan 6, cyclone unit 10, electric dust collection unit 11, smoke exhaust fan 12 and chimney 13, cooler 2 is connected to the kiln head of kiln body 1, kiln tail upper portion of kiln body 1 has set gradually upright flue, cyclone unit 10, electric dust collection unit 11, smoke exhaust fan 12 and chimney 13, be used for removing dust and discharge the flue gas after calcining, quantitative feeder 4, denitrifier surge bin 5, roots's fan 6 constitutes denitrifier feeding device, and be connected with universal rotary conveyor 3's feed end, denitrifier pipeline 9 is connected to universal rotary conveyor 3's discharge end;
as shown in fig. 2-3, the utility model discloses a denitration agent pipeline 9 draws forth kiln body 1 outside and extends along the kiln head direction through one of them foot of tripod mount 7, denitration agent pipeline 9 overlaps with one of them support of tripod mount 7, and draw forth outside kiln body 1 through the trompil of kiln body 1, kiln body 1 interior tripod mount 7 plane is equallyd divide equally and is 120 contained angles, it puts and sets up frame pipeline 14 to kiln body 1 high temperature region stationing, encircle kiln body 1 in frame pipeline 14 exit and set up spray gun 8, spout kiln body 1's high temperature region with the reductant by spray gun 8, carry out denitration reaction.
The specific process flow of denitration is as follows:
the denitration reducing agent is stored in a denitration agent buffer bin 5, power is provided by a Roots blower 6, the denitration agent is mixed and supplied by a quantitative feeder 4 according to a certain proportion, the denitration agent is conveyed to a denitration agent conveying pipeline 9 in a kiln body 1 through a conveying pipeline 9 by a universal rotary conveying device 3, the denitration agent conveying pipeline 9 is led out of the kiln at a fixed position of a tripod fixing frame 7 and conveyed to a high-temperature region along a conveying pipe of the kiln body 1, the denitration reducing agent is conveyed into the kiln body 1 through a spray gun device 8 surrounding the kiln body 1 and is uniformly distributed, chemical reaction is carried out, NOx is reduced to N2, and therefore the purpose of denitration is achieved, and the denitration efficiency reaches 41-68%.
The fuel coal powder of the clinker kiln body 1 and the coal-feeding air are mixed and then are fed from the kiln head of the kiln body 1, raw slurry is fed from the kiln tail of the kiln body 1 by a feeding machine, the calcined clinker is cooled by a kiln head feeding cooler 2, and flue gas after calcination is subjected to vertical flue dust removal, cyclone dust removal 10 and electric dust collection 11 and then is discharged into the atmosphere through a chimney 13 by a flue gas fan 12.
Example 1:
a solid powder reduction denitration agent is adopted, the main components of the agent are urea, an organic catalyst, a stable buffering agent and the like, the agent is supplied by mixing through a quantitative feeder 4, the agent is conveyed to a denitration agent conveying pipeline 9 in a kiln body 1 through a universal rotary conveying device 3 through a conveying pipeline 9, a three-leg fixing frame 7 is arranged at a position 6 meters away from the kiln tail, 1 group of frame pipelines 14 is arranged, 1 spray gun is arranged, solid powder materials are conveyed in a water cooling jacket mode, the temperature area of flue gas for spraying a reducing agent in the kiln is controlled at 650 ℃, the temperature in the kiln body 1 is higher, the denitration agent can be decomposed at high temperature, the denitration agent can be temporarily bonded to the denitration agent conveying pipeline 9 in the water cooling jacket mode, so that the denitration agent is more uniform and effective when sprayed in the kiln body 1, the denitration agent enters a cooler 2 for cooling after denitration reaction, flue gas generated by calcination is subjected to vertical flue dust removal, cyclone, the flue gas inlet fan 12 is discharged into the atmosphere through a chimney 13, and finally the denitration efficiency is measured to reach 41%;
example 2:
adopts liquid solution as a reduction denitration agent, mainly comprises mixed solution of urea, ammonia water, an organic catalyst, a stable buffering agent and the like, a denitration agent conveying pipeline 9 which is supplied by mixing through a quantitative feeder 4 and conveyed into the kiln body 1 through a conveying pipeline 9 and a universal rotary conveying device 3, a three-foot fixing frame 7 is arranged at a position 25 meters away from the kiln tail, 4 groups of frame pipelines 14 are arranged, 6 spray guns are arranged, after the liquid denitration agent needs to be atomized into a small liquid drop, compressed air provides power to carry a liquid-drop denitration agent to be sprayed into a kiln body 1, the temperature area of flue gas sprayed with a reducing agent in the kiln body 1 is controlled at 1150 ℃, the flue gas enters a cooler 2 for cooling after denitration reaction, flue gas generated by calcination is dedusted by a vertical flue, cyclone deduster 10 and electric deduster 11, the flue gas inlet fan 12 is discharged into the atmosphere through a chimney 13, and finally the denitration efficiency is determined to reach 68%.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A denitration system for calcining flue gas of an alumina clinker kiln comprises a kiln body and is characterized by also comprising a denitration agent supply device and a jet denitration device, wherein,
the denitration agent supply device is connected with a universal conveyor, the universal conveyor is connected with a denitration agent conveying pipeline arranged in the kiln body, the denitration agent conveying pipeline is replaced by a denitration agent conveying pipeline from the center of the kiln body through one of three-foot fixing frames, and the denitration agent conveying pipeline is fixed on the kiln body and is provided with holes to extend out of the outer side of the kiln body;
the jet denitration device is arranged on the outer side of the kiln body in a surrounding manner and is connected with the denitration agent conveying pipeline.
2. The system for denitration of flue gas generated by calcination in an alumina clinker kiln, according to claim 1, wherein the denitration agent supply device comprises a denitration agent buffer bin, a quantitative feeder and a Roots blower, wherein a discharge port of the denitration agent buffer bin is connected with an inlet of the quantitative feeder, and the Roots blower is connected with an air inlet of the quantitative feeder.
3. The alumina clinker kiln calcination flue gas denitration system according to claim 1, wherein the injection denitration device comprises a frame pipeline arranged around the outside of the kiln body and n spray guns arranged on the outlet of the frame pipeline, the inlet of the frame pipeline is connected with the denitration agent delivery pipeline, and the spray guns are uniformly distributed around the outside of the cross section of the kiln body.
4. The alumina clinker kiln calcination flue gas denitration system of claim 1, wherein the universal conveyor drives the denitration agent conveying pipe to rotate relative to the kiln body.
5. The alumina clinker kiln calcination flue gas denitration system as claimed in claim 1, wherein the tripod fixing frame is arranged at a position 6-25 meters away from the kiln tail of the kiln body.
6. The alumina clinker kiln calcination flue gas denitration system according to claim 3, wherein the number of the frame pipes is 1-4.
7. The alumina clinker kiln calcination flue gas denitration system according to claim 3, wherein the number n of the spray guns is 1-6.
8. The alumina clinker kiln calcination flue gas denitration system as claimed in claim 1, further comprising a cooler connected to a kiln head of the kiln body.
9. The alumina clinker kiln calcination flue gas denitration system as claimed in claim 1, further comprising a dust removal system, wherein the dust removal system comprises a vertical flue arranged at the kiln tail of the kiln body, a cyclone dust removal unit connected with the vertical flue, and an electric dust removal unit connected with the cyclone dust removal unit.
10. The alumina clinker kiln calcination flue gas denitration system according to claim 9, further comprising a smoke exhaust system connected to the dust removal system, the smoke exhaust system comprising a smoke exhaust fan connected to the dust removal system and a chimney connected to the smoke exhaust fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920068365.6U CN210332267U (en) | 2019-01-16 | 2019-01-16 | Flue gas denitration system for calcination of alumina clinker kiln |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920068365.6U CN210332267U (en) | 2019-01-16 | 2019-01-16 | Flue gas denitration system for calcination of alumina clinker kiln |
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| CN210332267U true CN210332267U (en) | 2020-04-17 |
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| CN201920068365.6U Active CN210332267U (en) | 2019-01-16 | 2019-01-16 | Flue gas denitration system for calcination of alumina clinker kiln |
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