CN211025758U - Be used for cement kiln flue gas denitration system - Google Patents
Be used for cement kiln flue gas denitration system Download PDFInfo
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- CN211025758U CN211025758U CN201921678210.0U CN201921678210U CN211025758U CN 211025758 U CN211025758 U CN 211025758U CN 201921678210 U CN201921678210 U CN 201921678210U CN 211025758 U CN211025758 U CN 211025758U
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- denitration reactor
- denitration
- decomposing furnace
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- flue gas
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Abstract
The utility model relates to a flue gas denitration system for a cement kiln, which comprises a rotary kiln, a decomposing furnace, a coal feeding system, a denitration reactor and a preheater; one end of the denitration reactor is communicated with the kiln tail of the rotary kiln, and the other end of the denitration reactor is arranged on the side wall of the decomposing furnace; the lower end of the decomposing furnace is provided with a blast pipe, and the upper end of the decomposing furnace is provided with a smoke exhaust pipe; the outlet of the coal feeding system is respectively communicated with the denitration reactor and the decomposing furnace, and the outlet of the feeding system is respectively communicated with the rotary kiln, the denitration reactor and the decomposing furnace; a large amount of high-temperature gas with low oxygen and high nitrogen oxide concentration generated in the high-temperature calcining process in the rotary kiln enters the denitration reactor, the part of gas is mixed with the coal powder fed into the denitration reactor by the coal feeding system, the coal powder is subjected to anoxic combustion in the denitration reactor to generate carbon monoxide with a certain concentration, and the carbon monoxide reduces the nitrogen oxide into nitrogen; reducing the content of nitrogen oxides in the discharged tail gas; thereby improving the flue gas denitration efficiency of the cement kiln.
Description
Technical Field
The utility model relates to a be used for cement kiln flue gas denitration system.
Background
With the enhancement of environmental awareness, the emission of harmful gases such as carbon monoxide, nitrogen oxides and fluid has strict national standards. The total amount of nitrogen oxide emission in the cement industry is second to that in the thermal power generation and motor vehicle industries. A technique for reducing nitrogen oxides in exhaust gas is called a denitration technique; the denitration techniques commonly used at present include SCR (selective catalytic reduction) techniques and SNCR (selective non-catalytic reduction) techniques.
The SCR (selective catalytic reduction) technology is mainly applied to tail gas denitration treatment of a thermal power plant. The denitration technology has high denitration efficiency, but is not suitable for the low-temperature working condition in high dust of a cement kiln, and has the problems of catalyst poisoning and carrier blockage.
The SNCR (selective non-catalytic reduction) technology is a low-nitrogen combustion technology in which a reducing agent (ammonia water or urea solution) is injected into a suitable temperature window of a decomposing furnace to reduce NOx into N2 and H2O, and air staged combustion or fuel staged combustion is partially used as an auxiliary. The technology has the defects of low denitration efficiency and high consumption of reducing agents, and the problems of accelerated corrosion of subsequent equipment and increased clinker burning heat consumption.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem of cement kiln flue gas denitration inefficiency, the utility model provides a be used for cement kiln flue gas denitration system. In order to achieve the above object, the utility model discloses a following technical scheme specifically as follows:
a flue gas denitration system for a cement kiln comprises a rotary kiln, a decomposing furnace, a coal feeding system, a feeding system and a preheater for preheating raw materials by using waste heat of tail gas of the decomposing furnace; the system for denitration of the cement kiln flue gas further comprises a denitration reactor for communicating the rotary kiln with the decomposing furnace, wherein one end of the denitration reactor is communicated with the kiln tail of the rotary kiln, and the other end of the denitration reactor is arranged on the side wall of the decomposing furnace; the lower end of the decomposing furnace is provided with a blast pipe, and the upper end of the decomposing furnace is provided with a smoke exhaust pipe; and the outlet of the coal feeding system is respectively communicated with the denitration reactor and the decomposing furnace, and the outlet of the feeding system is respectively communicated with the rotary kiln, the denitration reactor and the decomposing furnace.
The utility model discloses a beneficial effect for cement kiln flue gas denitration system: the denitration reactor is arranged between the rotary kiln and the denitration reactor, a large amount of high-temperature gas with low oxygen and high nitrogen oxide concentration generated in the high-temperature calcination process in the rotary kiln enters the denitration reactor, the part of gas is mixed with coal powder fed into the denitration reactor by the coal feeding system, the coal powder is subjected to anoxic combustion in the denitration reactor to generate carbon monoxide with certain concentration, and the carbon monoxide reduces the nitrogen oxide into nitrogen; reducing the content of nitrogen oxides in the discharged tail gas; thereby improving the flue gas denitration efficiency of the cement kiln. Meanwhile, the time for burning the pulverized coal and decomposing the raw materials is prolonged, and the yield of the cement kiln is improved.
Further, the denitration reactor is a cylindrical pipe body, and the side wall of the denitration reactor comprises a refractory material layer, a heat-insulating material layer and a protective layer from inside to outside.
Has the advantages that: the denitration reactor is arranged into a cylindrical pipe body, so that the mixing and flowing of the coal powder and the high-temperature gas in the denitration reactor are facilitated, and the reduction effect of nitrogen oxides is improved; the lateral wall with denitration reactor sets to refractory material layer, insulating material layer and protective layer, when improving denitration reactor's refractoriness, reduces the heat and diffuses from denitration reactor's lateral wall, reduces the consumption of buggy.
Further, the entrance of denitration reactor is provided with first manometer and first thermometer, and the middle part is provided with the second thermometer, and the exit is provided with second manometer, third thermometer.
Has the advantages that: set up manometer and thermometer respectively in the entry of denitration reactor, middle part and exit, carry out real time monitoring to temperature and pressure in the denitration reactor, make temperature and pressure control in reasonable scope.
Further, a high-temperature gas analyzer for detecting high-temperature gas components is arranged at an outlet of the denitration reactor.
Has the advantages that: a high-temperature gas analyzer is arranged at the outlet, and the content of nitrogen oxides in the high-temperature gas discharged by the denitration reactor is detected and monitored in real time; the tail gas discharged by the cement kiln flue gas denitration system meets the national standard.
Further, the coal feeding system comprises a conveying pipe body, a metering device for metering the volume of the pulverized coal and a blower; the metering device is arranged at the front end of the conveying pipe body, the rear end of the conveying pipe body is divided into two paths, the tail ends of the two paths of conveying pipe bodies are provided with distributors, and pulverized coal is symmetrically sprayed into the denitration reactor or the decomposing furnace through the distribution of the distributors.
Has the advantages that: by arranging the metering device, the amount of the pulverized coal blown into the conveying pipe is strictly controlled, and the proportion of the high-temperature gas with low oxygen and high nitrogen oxide concentration entering the denitration reactor to the pulverized coal is adjusted, so that the reduction reaction is favorably carried out; the distributor enables the pulverized coal to be symmetrically sprayed into the denitration reactor, and is beneficial to uniform mixing of the pulverized coal and high-temperature gas.
Further, the feeding system is a cylindrical pipe body, and the side wall of the feeding system has the same structure as that of the denitration reactor; and a material scattering device is arranged at the joint of the feeding system and the denitration reactor.
Has the advantages that: the side walls of the feeding system and the denitration reactor adopt the same structure, so that the production cost is reduced; the material scattering device is arranged at the joint of the feeding system and the denitration reactor, so that raw materials can be scattered into the denitration reactor uniformly.
Furthermore, a material accumulation preventing device is arranged at the joint of the denitration reactor and the decomposing furnace, and comprises an air cannon, a material cleaning hole and a discharging hole.
Has the advantages that: prevent long-pending material device through the setting, to denitration reactor's inside surface clearance, prevent that denitration reactor from blockking up.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the denitration system for flue gas of a cement kiln according to the present invention;
FIG. 2 is a cross-sectional view of a denitrification reactor for an embodiment of a cement kiln flue gas denitrification system of the present invention;
FIG. 3 is a schematic view of the structure of the spreading box;
fig. 4 is the structural schematic diagram of the coal feeding system of the embodiment of the flue gas denitration system for the cement kiln of the utility model.
Reference numbers in the figures: 1-rotary kiln, 2-decomposing furnace, 3-coal feeding system, 4-feeding system, 5-denitration reactor, 6-preheater, 61-preheater I, 62-preheater II, 63-preheater III, 64-preheater IV, 7-blast pipe, 8-smoke exhaust pipe, 9-blast apparatus, 10-metering device, 11-conveying pipe body, 12-heat insulation material layer, 13-protective layer, 14-refractory material layer, 15-material spreading box, 151-inner partition plate, 152-inlet and 153-outlet.
Detailed Description
The utility model discloses a concrete structure of embodiment for cement kiln flue gas denitration system is shown as figure 1, and this deNOx systems includes rotary kiln 1, dore furnace 2, coal feeding system 3, feed system 4, denitration reactor 5 and pre-heater 6. The rotary kiln 1 and the decomposing furnace 2 used for the cement kiln flue gas denitration system are common rotary kiln 1 and decomposing furnace 2 for cement production, wherein the lower end of the decomposing furnace 2 is provided with a blast pipe 7, and the upper end is provided with a smoke exhaust pipe 8. The preheater 6 is a preheater 6 for preheating raw materials by using the waste heat of the tail gas of the decomposing furnace 2 in the existing cement production line; the preheater 6 is a grading preheater 6; the graded preheater 6 belongs to the prior art and mainly comprises a preheater I61, a preheater II 62, a preheater III 63 and a preheater IV 64; the preheater 6 preheats the feeding system 4 by using the flue gas discharged by the decomposing furnace 2.
A first pressure gauge and a first temperature gauge are arranged at the inlet 152 of the denitration reactor 5, a second temperature gauge is arranged in the middle of the denitration reactor, and a second pressure gauge and a third temperature gauge are arranged at the outlet 153 of the denitration reactor; set up manometer and thermometer respectively in entry 152, middle part and the export 153 department of denitration reactor 5, carry out real time monitoring to temperature and pressure in the denitration reactor 5, make temperature and pressure control in reasonable scope, be favorable to the reduction of nitrogen oxide to react's emergence. In this embodiment, the first thermometer, the second thermometer, and the third thermometer are respectively high temperature resistant thermometers, and the first pressure gauge and the second pressure gauge are respectively high temperature resistant pressure gauges; in other embodiments, thermocouples can be used to detect the temperature of each point of the denitration reactor instead of a high temperature resistant thermometer; and a pressure sensor is adopted to replace a high-temperature-resistant pressure gauge to detect the pressure of each point of the denitration reactor. A high-temperature gas analyzer for detecting components of the high-temperature gas is arranged at the outlet 153 of the denitration reactor 5; the high-temperature gas analyzer is a high-temperature gas analyzer with the model number of scs-900A-11A, which is produced by Beijing Xuedilong science and technology Co. Detecting the content of nitrogen oxides in the high-temperature gas discharged from the denitration reactor 5 and monitoring in real time; the tail gas discharged by the cement kiln flue gas denitration system meets the national standard. And a material accumulation preventing device is arranged at the joint of the denitration reactor 5 and the decomposing furnace 2, and comprises an air cannon, a material cleaning hole and a discharging hole. Wherein the material cleaning hole and the material discharging hole are arranged on the bottom side wall at the joint of the denitration reactor 5 and the decomposing furnace 2, and the material cleaning plugging door and the material discharging plugging door for plugging the material cleaning hole or the material discharging hole are respectively arranged at the material cleaning hole and the material discharging hole; when the accumulated material is too much, the plugging door is opened or the plugging door for discharging is opened, and the accumulated material is cleaned by cleaning tools such as a practical high-pressure water gun and the like and is discharged through a discharging hole. The air cannon is communicated with the compressed air pipeline and is used for periodically and automatically jetting the position.
In the present embodiment, as shown in fig. 4, the coal feeding system 3 includes a conveying pipe body 11, a metering device 10 for metering the volume of pulverized coal, and a blower 9; the conveying pipe body 11 is a cylindrical pipe body, the side wall of the conveying pipe body 11 is a steel plate layer, and a heat insulation layer is not arranged. The metering device 10 and the blower 9 are arranged at the front end of the conveying pipe body 11, the end of the pulverized coal entering the conveying pipe body 11 where the inlet 152 is located is the front end, and the end far away from the pulverized coal inlet 152 is the rear end; the metering device 10 is a powder metering scale, and the blower 9 is a roots blower installed at one end of the conveying pipe body 11, and the specific structure is shown in fig. 4. The rear end of the conveying pipe body 11 is respectively communicated with the denitration reactor 5 and the decomposing furnace 2; a distributor is arranged at the joint of the conveying pipe body 11 and the denitration reactor 5 and the decomposing furnace 2 respectively, the distributor is a tee with an adjusting partition plate arranged inside, and two outlets 153 of the tee are symmetrically arranged at two sides of the denitration reactor 5 respectively; the pulverized coal is symmetrically sprayed into the denitration reactor 5 through the distribution of the distributor. By arranging the metering device 10, the amount of the pulverized coal blown into the conveying pipe body 11 is strictly controlled, and the proportion between the high-temperature gas with low oxygen and high nitrogen oxide concentration entering the denitration reactor 5 and the pulverized coal is adjusted, so that the reduction reaction is favorably carried out; the distributor enables the pulverized coal to be symmetrically sprayed into the denitration reactor 5, and is beneficial to uniform mixing of the pulverized coal and high-temperature gas. In other embodiments, no distributor may be provided.
In this embodiment, the feeding system 4 is a cylindrical pipe, and the side wall of the feeding system 4 has the same structure as the side wall of the denitration reactor 5; comprises a refractory material layer 14, a heat insulation material layer 12 and a protective layer 13 from inside to outside. The feeding system 4 comprises two groups, and an outlet 153 of the first group of feeding system is respectively communicated with the denitration reactor 5 and the decomposing furnace 2; the outlet 153 of the second group of feeding systems is communicated with the rotary kiln 1; wherein preheater I61 and preheater III 63 were used to preheat the first set of feed systems and preheater II 62 and preheater IV 64 were used to preheat the second set of feed systems. A material scattering device is arranged at the joint of the feeding system 4 and the rotary kiln 1, the denitration reactor 5 and the decomposing furnace 2 respectively, the material scattering device is a material scattering box 15, and the structure is shown in figure 3An inner partition plate 151 is arranged in the material scattering box 15, the inner partition plate 151 is fixed in the material scattering box 15, an outlet 153 communicated with the rotary kiln 1, the denitration reactor 5 or the decomposing furnace 2 is arranged at the front end of the material scattering box 15, and an inlet 152 communicated with the cylindrical pipe body is arranged at the rear end of the material scattering box 15; the inner partition 151 divides the outlet 153 of the feeding system 4 in half and changes the direction of addition of part of the raw meal. The side walls of the feeding system 4 and the denitration reactor 5 adopt the same structure, so that the production cost is reduced; the material scattering device is arranged at the joint of the feeding system 4 and the denitration reactor 5, so that raw materials can be uniformly scattered into the denitration reactor 5. By adding part of the raw meal into the denitration reactor 5 and the decomposing furnace 2; CaCO in raw meal3Absorbs heat to generate chemical reaction to generate CaO and CO2Maintaining the temperature in the denitration reactor 5 at 850-900 ℃; meanwhile, the problem of serious local skinning caused by high temperature generated by pulverized coal combustion is avoided. In other embodiments, no spreading box may be provided.
The use process comprises the following steps: a large amount of high-temperature gas with low oxygen and high nitrogen oxide concentration generated in the high-temperature calcination process in the rotary kiln 1 enters the denitration reactor 5, the part of gas is mixed with the coal powder fed into the denitration reactor 5 by the coal feeding system 3, the coal powder is subjected to anoxic combustion in the denitration reactor 5 to generate carbon monoxide with a certain concentration, and the carbon monoxide reduces the nitrogen oxide into nitrogen; reducing the content of nitrogen oxides in the discharged tail gas; thereby improving the denitration efficiency of the flue gas of the cement kiln; reduce the content of nitrogen oxide in the flue gas.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (7)
1. A flue gas denitration system for a cement kiln comprises a rotary kiln, a decomposing furnace, a coal feeding system, a feeding system and a preheater for preheating raw materials by using waste heat of tail gas of the decomposing furnace; the system is characterized by further comprising a denitration reactor for communicating the rotary kiln with the decomposing furnace, wherein one end of the denitration reactor is communicated with the kiln tail of the rotary kiln, and the other end of the denitration reactor is arranged on the side wall of the decomposing furnace; the lower end of the decomposing furnace is provided with a blast pipe, and the upper end of the decomposing furnace is provided with a smoke exhaust pipe; and the outlet of the coal feeding system is respectively communicated with the denitration reactor and the decomposing furnace, and the outlet of the feeding system is respectively communicated with the rotary kiln, the denitration reactor and the decomposing furnace.
2. The cement kiln flue gas denitration system according to claim 1, wherein the denitration reactor is a cylindrical pipe body, and the side wall of the denitration reactor comprises a refractory material layer, a heat insulation material layer and a protective layer from inside to outside.
3. The cement kiln flue gas denitration system according to claim 2, wherein a first pressure gauge and a first temperature gauge are arranged at an inlet of the denitration reactor, a second temperature gauge is arranged at the middle part of the denitration reactor, and a second pressure gauge and a third temperature gauge are arranged at an outlet of the denitration reactor.
4. The cement kiln flue gas denitration system according to claim 3, wherein a high-temperature gas analyzer for detecting high-temperature gas components is provided at an outlet of the denitration reactor.
5. The cement kiln flue gas denitration system according to claim 1, wherein the coal feeding system comprises a conveying pipe body, a metering device for metering the volume of pulverized coal, and a blower; the metering device is arranged at the front end of the conveying pipe body, the rear end of the conveying pipe body is divided into two paths, the tail ends of the two paths of conveying pipe bodies are provided with distributors, and pulverized coal is symmetrically sprayed into the denitration reactor or the decomposing furnace through the distribution of the distributors.
6. The cement kiln flue gas denitration system according to claim 1, 4 or 5, wherein the feeding system is a cylindrical pipe body, and the side wall of the feeding system has the same structure as the side wall of the denitration reactor; and a material scattering device is arranged at the joint of the feeding system and the denitration reactor.
7. The cement kiln flue gas denitration system according to claim 6, wherein a material accumulation preventing device is arranged at the joint of the denitration reactor and the decomposing furnace, and the material accumulation preventing device comprises an air cannon, a material cleaning hole and a material discharging hole.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112426877A (en) * | 2020-09-24 | 2021-03-02 | 宣城市楷昂化工有限公司 | Method and equipment for treating nitrogen oxide waste gas in sodium metabisulfite production |
| CN113135677A (en) * | 2021-05-17 | 2021-07-20 | 南京凯盛国际工程有限公司 | Combustible waste gasification combustion and flue gas purification system and operation principle thereof |
| CN114777471A (en) * | 2022-05-07 | 2022-07-22 | 金华亨泰工程技术有限公司 | Energy-saving denitration method for coal powder injection of rotary cement kiln decomposing furnace |
-
2019
- 2019-10-09 CN CN201921678210.0U patent/CN211025758U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112426877A (en) * | 2020-09-24 | 2021-03-02 | 宣城市楷昂化工有限公司 | Method and equipment for treating nitrogen oxide waste gas in sodium metabisulfite production |
| CN112426877B (en) * | 2020-09-24 | 2022-07-19 | 宣城市楷昂化工有限公司 | Method and equipment for treating nitrogen oxide waste gas in sodium metabisulfite production |
| CN113135677A (en) * | 2021-05-17 | 2021-07-20 | 南京凯盛国际工程有限公司 | Combustible waste gasification combustion and flue gas purification system and operation principle thereof |
| CN114777471A (en) * | 2022-05-07 | 2022-07-22 | 金华亨泰工程技术有限公司 | Energy-saving denitration method for coal powder injection of rotary cement kiln decomposing furnace |
| CN114777471B (en) * | 2022-05-07 | 2023-09-01 | 金华亨泰工程技术有限公司 | Energy-saving and denitration coal dust spraying method for rotary cement kiln decomposing furnace |
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