CN211514054U - Novel dry process is living beings deNOx systems for cement kiln - Google Patents
Novel dry process is living beings deNOx systems for cement kiln Download PDFInfo
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Abstract
The application relates to a novel dry process is living beings deNOx systems for cement kiln, it adds the device including the blending agent that is used for adding living beings denitration blending agent, the blending agent adds the device and enters the mouth including the blending agent that is located the rotary kiln tail end of cement kiln to the first position department between the tertiary air pipe tail end. The biomass denitration system realizes economical, efficient and environment-friendly flue gas denitration, has the characteristics of low equipment investment, simplicity and convenience in use, green and renewable denitration agent and the like, can powerfully promote the emission reduction of NOx in the cement industry and the environmental protection, and has important environmental, social and economic significance.
Description
Technical Field
The application belongs to cement industry flue gas denitration field, relates to a novel denitration system for dry process cement kiln, especially relates to a novel biomass denitration system for dry process cement kiln.
Background
With the expansion of the production scale of cement in China, the discharge amount of nitrogen oxides (NOx) in the cement industry becomes the third largest pollution source second to thermal power generation and automobile exhaust, and the increasingly fragile ecological environment is seriously influenced. In addition, in recent years, smoke denitration in the cement industry is urgent in large and medium-sized cities across the country due to natural disasters such as haze and acid rain. The United release of environmental protection department of 12 months in 2013 and the State quality supervision, inspection and quarantine Bureau jointly release 'emission Standard of atmospheric pollutants for Cement industry' GB4915-2013 to replace the original standard GB4915-2004, and stipulate the NOx (according to NO) of the existing and newly-built cement plants2Meter) emission concentration not exceeding 400mg/m3The critical area implementation special emission limit is 150mg/m3。
Currently, the most widely used flue gas denitration technology in the cement industry is the selective non-catalytic reduction NOx technology (SNCR). The SNCR method may use ammonia, ammonia gas, or urea as a reducing agent. The denitration efficiency of the technology is low (generally<60 percent) of the total nitrogen content in the flue gas, resulting in the denitration of the flue gas of cement enterprisesHigher, it is also not possible to meet the increasingly stringent NOx emission standards (it is not possible to reduce the NOx emission concentration to 150mg/m 3). Titanium-based vanadium-based catalyst (V) is commonly used in Selective Catalytic Reduction (SCR) technology2O5-WO3/TiO2). The SCR method may also use ammonia, ammonia gas, or urea as a reducing agent. The SCR method has a high active temperature window (320-420 ℃), and an SCR device needs to be arranged in front of a kiln tail dust collector. However, there is dust and SO in the flue gas2The concentration is high, which easily causes catalyst poisoning and reduces the service life of the catalyst. The ammonia water use efficiency in SCR and SNCR denitration technologies is 60-80%, when the temperature is too high, ammonia and oxygen react to generate NOx, and when the temperature is too low, the reduction rate of the NOx is too low, and ammonia in flue gas escapes seriously. In addition, ammonia water is also a high-energy-consumption and high-pollution product, and the ammonia water denitration is only used for transferring pollution from the cement industry to the fertilizer industry, so that the technology does not have any significance for emission reduction at the national level. Therefore, the development of a low-cost and high-efficiency flue gas denitration technology suitable for the cement industry is urgently needed.
In addition, the prior technical specification GB 51045-. Based on the particularity of the denitration reaction principle of the denitration technology, the source of target pollutants, the denitration reaction conditions (such as the denitration reaction temperature), the reaction environment, the selection of the denitration agent and the like, the skilled person in the field generally considers that the denitration technology is obviously different from other environmental protection technologies such as the desulfurization technology and the like, and then the technology in other fields cannot be directly used for solving the problems in the denitration technology.
Generally, the denitration process in the prior art has low efficiency and poor denitration effect, and the denitration agent has the problems of high cost and serious pollution; moreover, the technical field is easy to limit when a person skilled in the art develops the denitration technology, so that a satisfactory economical, environment-friendly and efficient denitration technology for the dry-process cement kiln still does not appear at present.
On the other hand, biomass resources on earth are very large in quantity and can be continuously regenerated, and the main constituent elements of the biomass resources are C, H and O, which are three elements which are most frequently converted or used in modern chemical industry. Biomass resources play a more important role in the human resource structure, if they can be efficiently converted into starting materials that can be utilized by the chemical industry. Therefore, the preparation of various chemicals from biomass has become an important means for the efficient utilization of biomass resources, and the development of biomass chemical technology is taken as an important strategic deployment and a great deal of manpower and material resources are invested in research and development in all countries in the world. From the redox point of view of reaction, C and H elements contained in the biomass have reducibility, and how to apply the C and H elements in the biomass as a nitrogen oxide reducing agent in the cement industry to replace the currently used high-energy reducing agent ammonia water is an important research target with wide prospect and great economic and social benefits.
The applicant finds that by using the denitration system, the efficiency of the denitration process can be obviously improved, the denitration effect is improved, and the denitration cost is reduced.
SUMMERY OF THE UTILITY MODEL
In order to reduce the emission of NOx in the flue gas of a cement kiln (particularly a novel dry-process cement kiln), the applicant of the application provides a denitration system for the cement kiln according to the characteristics of the cement production process (particularly the characteristics of a decomposing furnace structure and atmosphere), particularly a biomass denitration system for the cement kiln, and realizes economic, efficient and environment-friendly flue gas denitration.
The novel dry cement production method is a modern cement production method taking suspension preheating and kiln outside decomposition technologies as the core, and is a cement production method generally adopted in China. The apparatus used in the new dry cement production process typically includes at least rotary kiln, decomposing furnace and cyclone.
In one aspect, the present application provides a novel biomass denitration system for a dry cement kiln, comprising a mixture adding device for adding a biomass denitration mixture, wherein the mixture adding device comprises a mixture inlet at a first position (also referred to as position 1, position (1)) between a rotary kiln tail end and a tertiary air pipe tail end of the cement kiln (preferably at or above a kiln tail smoke chamber and above a kiln tail smoke chamber expansion joint). The mixture adding device is used for adding the biomass denitration mixture. Optionally, the biomass denitration system further comprises a water agent adding device, such as a water agent spray gun, at a third position (also referred to herein as position 3, position (3)) between the rear section to the lowest stage cyclone inlet, and/or between the lowest stage cyclone outlet and the penultimate cyclone inlet in the decomposing furnace. The water agent adding device is used for adding a biomass denitration water agent. In some embodiments, the outlet of the decomposing furnace and the inlet of the lowest stage cyclone are connected by a connecting air pipe, and the third position is located at the ascending part and/or the descending part of the connecting air pipe between the outlet of the decomposing furnace and the inlet of the lowest stage cyclone. In some embodiments, the third location is at the furnace outlet and/or the lowest stage cyclone inlet section. In some embodiments, the outlet of the lowest stage cyclone is connected with the inlet of the penultimate cyclone through a connecting air pipe, and the third position is located at any part of the connecting air pipe. Optionally, the biomass denitration system further comprises a water agent adding device, such as a water agent spray gun, located at a second position (also referred to herein as position 2, position (2)) between the tail end of the rotary kiln of the cement kiln and the tail end of the tertiary air duct. The water agent adding device is used for adding a biomass denitration water agent.
Reacting the biomass in the biomass denitration mixture added by the mixture adding device at the first position with water to generate CO and CH4、H2And hydrocarbon compounds such as HCN. The mixture can rapidly and efficiently reduce most of NOx into N2. Moreover, the inventor of the utility model also finds that because the biomass denitration mixture also enables the consumption of fuel (such as coal and pulverized coal) to be reduced, thereby improving the economic benefit. At an optional third location, there is also a further water agent addition device, such as a water agent spray gun, which adds a biomass de-nitrification water agent capable of reducing the residual NOx in the flue gas to N2And finally, ultra-low NOx emission is realized. At a third location, the aqueous biomass denitration agent added by the agent adding device is capable of reducing NOx.
The term "spraying" as used herein, independently at each occurrence thereof, refers to the addition of the denitrifier to a desired location by pressure in the presence or absence of a carrier (e.g., water or a carrier gas such as air). Other means known to those skilled in the art may also be used to add the denitrifier to the desired location, as long as the other means can add the denitrifier to the desired location. In some embodiments, the "addition" refers to "addition" that is achieved by various means, such as addition by spray gun spraying, or addition by an inlet (or opening) in the presence of gravity and/or negative pressure.
The embodiment of the disclosure can not only significantly improve the efficiency of the denitration process and improve the denitration effect, but also reduce the consumption of fuel (such as coal and pulverized coal) and reduce the denitration cost. The applicant has found that by using the system described providing a biomass denitration mixture in a first position, excellent denitration results can be obtained, the denitration efficiency achieved is significantly higher than in the prior art, and the amount of fuel (e.g. coal, coal fines) used is reduced. Further, the system having the biomass denitration mixture adding device at the first position and also having the biomass denitration water agent adding device at the third position can obtain higher denitration efficiency than the system having the biomass denitration mixture adding device at the first position. According to the requirement, the denitration system can further comprise a water agent adding device, such as a water agent spray gun, which is located at a second position between the tail end of the rotary kiln of the cement kiln and the tail end of the tertiary air duct and used for adding the biomass denitration water agent.
The aqueous spray guns at the second and third locations may be spray guns from the same or different aqueous addition means. Besides the water aqua spray gun, the water aqua spraying device preferably further comprises a water aqua storage tank, a circulating pump, a jet pump, a flow meter, a valve, a water aqua pipeline and a compressed air pipeline. The water agent storage tank is preferably provided with a special large-flow circulating pump, the circulating pump can be used as an unloading pump, and the circulating pump can solve the problems of high viscosity and easy layering of the biomass denitration water agent, so that the denitration water agent is uniformly dispersed. The spray gun is made of heat-resistant steel, and meanwhile, the inner structure is very smooth, so that the denitration water agent can be prevented from being blocked due to wall-hanging scaling in a pipeline, and meanwhile, the spray gun can have the service life of more than half a year. The number of the spray guns is preferably even, and the spray guns are symmetrically arranged pairwise, so that the denitration water agent can be uniformly dispersed in the reaction zone. The jet pump needs to overcome the viscosity of the biomass denitration aqueous solution, and preferably can adopt a plunger pump, a gear pump or a multistage centrifugal pump. In one embodiment, the spray gun in the second/third position is a single fluid spray gun. In one embodiment, the spray guns in the second/third position are two-fluid spray guns.
In addition to the admixture inlet, the admixture adding means preferably further comprises:
1) a mixture spray gun;
2) a material-air separation bin, a metering feeder or a combination thereof; or
3) A feed tube, or a spreading box, or a combination thereof.
When the admixture adding means comprises 1) an admixture spray gun, the admixture adding means further comprises: a mixing agent storage bin, a dust collector, a metering feeder, a pneumatic conveying pump, a Roots blower, a mixing agent pipeline, a compressed air pipeline and a valve. When the mixing agent adding device comprises 2) a material air separation bin, or a metering feeder, or a combination thereof, or 3) a feeding pipe, or a material scattering box, or a combination thereof, the mixing agent adding device further comprises a mixing agent storage bin, a dust collector, a pneumatic conveying pump, a Roots blower, a mixing agent pipeline, a compressed air pipeline and a valve. When the material-air separation bin or the metering feeder or the combination thereof or the feeding pipe or the scattering box or the combination thereof is used, a large amount of air can be prevented from entering the spraying point.
The reactions that may be involved in the denitration process are as follows:
(1) the biomass denitration agent is decomposed or reacts with carbon to release hydrocarbon:
2C+O2→2CO
C+H2O→CO+H2
CxHyOz→(x-z)C+z CO+y/2H2
(2) hydrocarbons reduce NOx to nitrogen:
2NOx+(x+1)H2→2NH+x H2O
NH+NH→N2+H2
2H2+2NO→N2+2H2O
2NOx+x C→N2+x CO2
2NOx+2x C→N2+2x CO
2NOx+2x CO→N2+2x CO2
the reaction principle of the denitration process is complex, various reaction processes are staggered, and the reaction generated under different conditions and environments can change at any time, so that it is not easy to obtain the denitration agent which can obtain excellent denitration effect under various working conditions.
Through theoretical and practical research for many years, this application has creatively provided biomass denitration system's technical scheme. The biomass denitration system comprises a mixing agent adding device for adding a biomass denitration mixing agent and an aqueous agent spraying device for spraying a biomass denitration aqueous agent.
(1) The biomass denitration mixing agent comprises:
the biomass denitration mixture comprises: 30-50 wt% of biomass carbon powder; 40-65 wt% of graphite ore powder; and 5-10 wt% of liquid biomass lysate. In one embodiment, the graphite ore fines comprise 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 65 wt.% of the biomass denitration mixture. In one embodiment, the biomass charcoal powder comprises 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50 wt% of the biomass denitration mixture. In one embodiment, the biomass lysate comprises 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, and 10 wt% of the biomass denitration mixture. In a preferred technical scheme, the biomass denitration mixing agent is prepared from 30-50 wt% of biomass carbon powder; 40-65 wt% of graphite ore powder; and 5-10 wt% of liquid biomass cracking liquid. The sum of all the components is 100 percent. The biomass denitration mixture is prepared by drying, processing, uniformly mixing and other operations of various raw materials according to the expected amount.
The graphite mineral powder used in the biomass denitration mixture is commercially available graphite mineral powder or graphite mineral powder obtained by other known methods, and is obtained by crushing and grinding graphite mineral. In one embodiment, the graphite ore powder used in the present application is produced in Chenzhou city, Hunan province, and ground to a fineness of 200 mesh with a carbon content of about 70%. It is clear to those skilled in the art that other suitable fineness or particle size, as well as other carbon content graphite ore fines, are also suitable for use in the denitrification mixture of the present application.
The biomass carbon powder used in the biomass denitration mixture is ground powder of biomass carbon. The biomass charcoal is a charcoal-containing solid substance obtained by carbonizing a biomass material under an anoxic and heating condition (preferably 400-800 ℃). The biomass material comprises any non-petrochemical plant material, animal material or microbial material (preferably plant material), wherein the biomass material used for preparing the biomass denitration mixture is optionally the same as or different from the biomass material used for preparing the biomass denitration aqueous solution. The biomass material comprises agriculture and forestry byproducts and/or industrial processing organic waste; preferably, wherein the agroforestry byproduct comprises: branches, leaves, bark, wood, grass, corncobs, straw, rice hulls, fruit shells, shrubs, and vines, wherein the industrial organic processing waste comprises: bagasse, wood waste (such as wood chips, wood processing waste, and woodlands), and straw waste. Specifically, the biomass carbon powder used in the test of the application is a carbon-containing solid product obtained by heating and carbonizing straw and rice hull under an anoxic condition, and is ground to 200 meshes of fineness. It is clear to those skilled in the art that other suitable biomass materials such as agriculture and forestry byproducts (including straw, rice hull, corn cob, bean hull, tree branch, wood, etc.), industrial processing organic waste materials (such as sugar cane waste residues in sugar industry, wood chips in wood processing, leftover materials, etc.) can obtain the biomass carbon powder in the application under similar conditions, and other suitable fineness is also suitable for the denitration mixture of the application.
The biomass lysate used in the biomass denitration mixture is as follows.
The biomass denitration mixture can be prepared into particles with different particle sizes, and the particle size of the particles is not particularly limited as long as the particles can be sprayed into the system through an air spray gun at a preset speed.
(2) The biomass denitration aqueous solution comprises:
the biomass denitration water agent comprises 40-80 wt% of water; 20-60 wt% of a liquid biomass cracking solution; and 10-40 wt% of C1-C10 monohydric alcohol or polyhydric alcohol. In one embodiment, the water comprises 40, 45, 50, 55, 60, 65, 70, 75, 80 wt% of the aqueous biomass denitration agent. In one embodiment, the liquid biomass cracking solution accounts for 20, 25, 30, 35, 40, 45, 50, 55, and 60 wt% of the aqueous biomass denitration solution. In one embodiment, the C1-C10 monohydric or polyhydric alcohol comprises 10, 15, 20, 25, 30, 35, 40 wt% of the aqueous biomass denitration agent. In a preferred embodiment, the biomass denitration water agent is prepared from 40-80 wt% of water; 20-60 wt% of a liquid biomass cracking solution; and 10-40 wt% of C1-C10 monohydric alcohol or polyhydric alcohol. The sum of all the components is 100 percent. The components are uniformly mixed according to a proportion to prepare the biomass denitration aqueous solution. The biomass denitration water agent is a mixture of water, C1-C10 monobasic or polyalcohol solvent and liquid biomass cracking liquid.
The liquid biomass cracking solution in the biomass denitration aqueous solution is a liquid substance containing C4-C17 or C4-C17 hydrocarbon oxygen substances or a mixture thereof, which is obtained in the process of cracking biomass materials under the conditions of oxygen deficiency and heating (preferably 400-800 ℃), and can contain a certain amount of water. The biomass material comprises any non-petrochemical plant material, animal material or microbial material (preferably plant material), wherein the biomass material used for preparing the biomass denitration mixture is optionally the same as or different from the biomass material used for preparing the biomass denitration aqueous solution. The plant material comprises an agroforestry byproduct and/or an industrial process organic waste, wherein the agroforestry byproduct comprises: branches, leaves, bark, wood, grass, corncobs, straw, rice hulls, fruit shells, shrubs, and vines, wherein the industrial organic processing waste comprises: bagasse, wood waste (such as wood chips, wood processing waste, and woodlands), and straw waste. The pyrolysis (also called pyrolysis or cracking) of biomass generally refers to a process in which biomass is heated to raise temperature under an oxygen-free or low-oxygen environment to cause molecular decomposition, thereby producing coke, condensable liquid and gaseous products, and is an important utilization form of biomass energy. Methods of biomass pyrolysis are known in the art. In one embodiment, used herein are liquid hydrocarbons of C4-C17, or mixtures of C4-C17 hydrocarbon oxygenates, obtained from the thermal cracking of branches and wood chips under anoxic conditions. As previously mentioned, it is clear to those skilled in the art that other suitable biomass materials such as byproducts of agriculture and forestry (including straw, rice hull, corn cob, bean hull, tree branch, wood, etc.), industrial processing organic waste (such as waste sugar cane dregs in sugar industry, wood chips in wood processing, leftover materials, etc.) can also obtain the liquid biomass cracking liquid described in the present case under similar conditions.
Illustrative C1-C10 mono-or polyols include, but are not limited to: methanol, ethanol, n-propanol, isopropanol, glycerol, n-butanol, isobutanol, t-butanol, benzyl alcohol, ethylene glycol, and the like, or a mixture of two or more thereof.
Regarding the positions of the aqueous agent spray gun and the admixture inlet (i.e., the positions of spraying/adding the biomass denitration agent):
the production line of the novel dry-method cement kiln is quite large in size, nitrogen-containing pollutants are generated in a plurality of devices or production links, and therefore the positions for adding the denitration agent are particularly selected and combined in a plurality of ways. However, the research of the present application finds that the addition position of the denitrifier has a significant influence on the final effect, and when the denitrifier is added at the addition position known in the prior art or in a device other than the present application, the denitration effect cannot achieve the technical effect of the present application. The applicant has studied and creatively proposed the following combinations of addition positions:
in the present application, the biomass denitration agent may be used in the following manner. The schematic of position 1, position 2 and position 3 is shown in figure 1.
Adding the biomass denitration mixture at a first position between the tail end of the rotary kiln and the tail end of the tertiary air pipe of the cement kiln (preferably at the kiln tail smoke chamber, more preferably above the kiln tail smoke chamber, and further preferably above the expansion joint of the kiln tail smoke chamber), for example, adding the biomass denitration mixture through a mixture inlet. In one embodiment, the tail end of the cement kiln is connected with a kiln tail smoke chamber, an expansion joint is arranged between the kiln tail smoke chamber and the decomposing furnace, and the tail end of the tertiary air pipe is connected with the decomposing furnace. In terms of the gas flow direction, the kiln tail smoke chamber is arranged below the expansion joint, and the tail end of the tertiary air pipe is arranged above the expansion joint. The upper part of the kiln tail smoke chamber refers to the range from the upper part of the kiln tail smoke chamber to the lower part of the tail end of the tertiary air duct. The range from the upper part of the expansion joint of the kiln tail smoke chamber (also called as the upper part of the expansion joint) to the lower part of the tail end of the tertiary air pipe is defined as the range from the upper part of the expansion joint. The construction of cement kilns and the interrelationship between the sections is well known to those skilled in the art.
Optionally, adding a biomass denitration aqueous agent at a second position (preferably at the kiln tail smoke chamber, more preferably above the kiln tail, and further preferably above the expansion joint of the smoke chamber of the kiln tail smoke chamber) between the tail end of the rotary kiln and the tail end of the tertiary air duct as required, for example, spraying the biomass denitration aqueous agent through an aqueous agent spray gun.
And optionally adding a biomass denitration water agent at a third position between the rear section and the inlet of the lowest stage cyclone cylinder in the decomposing furnace and/or between the outlet of the lowest stage cyclone cylinder and the inlet of the penultimate cyclone cylinder according to requirements, for example, spraying the biomass denitration water agent through a water agent spray gun. The rear section of the decomposing furnace is a section between one third of the height of the decomposing furnace and the outlet of the decomposing furnace, and the direction between one third of the height of the decomposing furnace and the outlet of the decomposing furnace is from bottom to top. The lowest stage of cyclone is the lowest stage of cyclone from bottom to top in the first stage or the multi-stage cyclones. The last but one second stage cyclone is the last but one second stage cyclone from bottom to top in the multistage cyclone. For example, the lowest stage cyclone of the five-stage cyclones is a C5 cyclone, and the penultimate stage cyclone is a C4 cyclone; the lowest stage of the six-stage cyclone cylinder is a C6 cyclone cylinder, and the penultimate stage of the six-stage cyclone cylinder is a C5 cyclone cylinder. And so on. In some embodiments, the outlet of the decomposing furnace is connected with the inlet of the lowest stage cyclone through a connecting air pipe. The connecting air pipe can be in any shape determined according to actual conditions. Typically, the connecting duct comprises an ascending portion and a descending portion. And the ascending part of the connecting air pipe is connected with the outlet of the decomposing furnace and used for leading out gas. The downstream part of the connecting air pipe is connected with the upstream part and the inlet of the lowest stage of cyclone and is used for guiding gas into the cyclone. The ascending portion and the descending portion are intended to indicate that gas flows first through the ascending portion and then through the descending portion, and are not intended to define the gas flow direction in other meanings. In some embodiments, the outlet of the decomposing furnace and the inlet of the lowest stage cyclone are connected by a connecting air pipe, and the third position is located at the ascending part and/or the descending part of the connecting air pipe between the outlet of the decomposing furnace and the inlet of the lowest stage cyclone. In some embodiments, the third location is at the furnace outlet or the lowest stage cyclone inlet section. In some embodiments, the outlet of the lowest stage cyclone is connected with the inlet of the penultimate cyclone through a connecting air pipe, and the third position is located at any part of the connecting air pipe.
In one embodiment, the connecting duct is curved, having a shape with a middle portion higher than one or both of the ends, such as an inverted U-shape or an n-shape (also known as a gooseneck). In this case, the upward flow portion also means a portion where the gas travels upward, and the downward flow portion also means a portion where the gas travels downward. The furnace outlet is also referred to herein as the burnout zone. In one embodiment, the descending portion of the connecting duct is also referred to as the decomposing furnace tail end.
In one embodiment, the height of the first location is higher, equal to or lower than the height of the second location. In one embodiment, the second position is 0.5-2 meters above the first position. The third position is after the first and second positions with respect to the gas flow direction.
The combination of the first position and the third position at two positions of the spray/add position can achieve a better effect than the add position at the first position.
In one embodiment of the present application, a biomass de-nitrification mixture is added from a first location and an aqueous de-nitrification agent is added from a third location.
In another embodiment of the present application, a biomass de-nitrification mixture is added from a first location and an aqueous de-nitrification agent is added simultaneously from a second location and a third location.
In one embodiment of the application, the biomass denitration mixture is sprayed from the first position by a mixture spray gun by using compressed air, or the mixture is added through a mixture inlet of the first position under the action of gravity and/or negative pressure by an air separation bin and/or a metering feeder, a feeding pipe and/or a scattering box; optionally, a single-fluid spray gun and/or a double-fluid spray gun is used for atomizing the denitration water agent into drops with the size of less than 100 mu m, and the drops are sprayed from a third position.
In another embodiment of the application, the biomass denitration mixture is sprayed from the first position by a mixture spray gun by using compressed air or is added through a mixture inlet at the first position under the action of gravity and/or negative pressure by an air separation bin and/or a metering feeder, a feeding pipe and/or a scattering box; optionally further, atomizing the denitration water into liquid drops (preferably liquid drops of <100 μm) by using a single-fluid spray gun and/or a two-fluid spray gun, and spraying from a second position; optionally further, the aqueous denitration agent is atomized into droplets (preferably <50 μm droplets) using a single fluid spray gun and/or a two fluid spray gun, and sprayed from a third location.
In one embodiment, the present application may utilize multiple/multi-layer lances, inlets, in each of the first, second and third positions. This application adds the overall arrangement through the multilayer (preferably stagger certain angle between each layer entry/spray gun), forms full coverage, evenly spouts and adds, improves biomass flue gas denitration agent's utilization efficiency. Each of the first, second, and third positions described herein can comprise one or more addition sites.
The amount of the biomass denitration admixture is 0.01 to 1.0 wt% (e.g., 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 wt%) of the amount of the cement raw material fed, and the amount of the biomass denitration agent is 0.01 to 1.0 wt% (e.g., 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.65, 0.95, 0.75 wt%) of the amount of the cement raw material fed. The flue gas denitration efficiency realized by the method can reach more than 90%, such as 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% and 99.5%.
In the present application, the denitration efficiency is (pre-denitration background concentration-post-denitration emission concentration)/pre-denitration background concentration 100%.
Compared with the prior art, the fuel (such as coal and coal powder) can be reduced by 30-60% by weight.
In addition, the biomass denitration water agent and the mixing agent spraying amount can be adjusted in real time according to the content of the NOx in the flue gas by using the metering feeder, the flow control device and the like, so that the continuous and accurate control of the emission indexes is achieved. If the admixtures and water agents are added at other locations, such as the front end of the rotary kiln, accurate control of emissions in real time is often not possible.
In conclusion, the spraying positions of the biomass denitration aqueous solution and the mixing agent in the application are extremely exquisite (the optimal spraying position is determined based on thousands of hours of industrial online tests), two biomass denitration agents (aqueous solution and mixing agent) are put forward for the first time, two or three spraying positions are combined and matched, the spraying amount of the biomass denitration aqueous solution and the mixing agent can be automatically controlled and adjusted according to the content of NOx in flue gas, and economic, environment-friendly and efficient flue gas denitration is realized. The system can introduce more hydrocarbon chemicals through a biomass water aqua and a mixing agent, and can remarkably improve the removal rate and efficiency of NOx by carrying out multiple mixing with the materials to be treated under the environment with proper temperature and atmosphere. More importantly, the comprehensive treatment concept of waste utilization is introduced into the environment-friendly cement industry by innovatively using a mixture adding device for adding a biomass denitration mixture and an aqueous agent spraying device for spraying a biomass denitration aqueous agent. The main components of the used denitrifier, namely the biomass denitration aqueous agent and the denitration mixture, are prepared by biomass carbonization and thermal cracking with wide sources, the raw materials are easily available, green, environment-friendly and renewable, meanwhile, the equipment investment is small, the process is simple and reliable, the clinker quality is not influenced, the denitration efficiency is high, the cost is low, compared with SCR and SNCR, the denitration agent has incomparable technical, economic and environment-friendly advantages, and has huge application prospect and potential in the field of flue gas denitration in the cement industry.
The present application focuses on the addition location and/or an inlet/lance at which the material (denitrifier) can be provided. Having knowledge of this information, one skilled in the art can readily prepare the denitrification system based on general knowledge in the art.
Unless otherwise specified, percentages, ratios, contents or parts described herein are by weight. Concentrations described herein are weight concentrations.
The temperature units "degrees" referred to herein are degrees celsius.
The application the denitrifier is a denitrifier for removing flue gas. Therefore, the term "biomass denitration agent" in the present application may also be referred to as "biomass flue gas denitration agent", and the two may be used interchangeably. Similarly, the term "biomass denitration mixture" in the present application may also be referred to as "biomass flue gas denitration mixture", and the two may be used interchangeably as well. The term "aqueous biomass denitration agent" in the application may also be referred to as "aqueous biomass flue gas denitration agent", and the two may be used interchangeably as well. Herein, the denitration agent refers to a denitration water agent and/or a denitration mixture.
Drawings
FIG. 1: one embodiment of one or more sites of the first location (location 1), the second location (location 2), and the third location (location 3) is shown, where the relative locations of air, clinker, cooler, and fuel are also shown.
FIG. 2: one embodiment of adding/spraying denitrifier from positions 1 and 3, wherein position 3 comprises two or more addition sites.
FIG. 3: one embodiment of adding/spraying the denitrifier from the position 1 and the position 2.
FIG. 4: an exemplary aqueous spray gun/mix inlet arrangement.
FIG. 5: an exemplary aqueous dispensing device.
FIG. 6: an exemplary admixture adding apparatus.
FIG. 7: one embodiment of adding/spraying the denitrifier from position 1.
FIG. 8: one embodiment of adding/spraying denitrifier from positions 1 and 3, wherein position 3 comprises one addition site.
Description of the reference numerals
1. Position 1
2. Position 2
3. Position 3
4. Rotary kiln
5. Kiln tail smoke chamber
6. Front section of decomposing furnace
7. Middle section of decomposing furnace
8. Rear section of decomposing furnace
9. Connecting the up-going part of the wind pipe
10. Connecting the downstream part of the wind pipe
C5 cyclone
12. Cyclone connecting air pipe
C4 cyclone
C3 cyclone
C2 cyclone
16.C1 cyclone
17. Tertiary air pipe
21. Biomass denitration mixing agent storage bin
22. Metering feeder
23. Mixing agent conveying pipeline
24. Air compressor
25. Gas flowmeter
26. Gas valve
27. Material and air separation bin
31. Biomass denitration water agent storage tank
32. Water agent output pump
33. Liquid flowmeter
34. Liquid valve
35. Liquid return valve
36. Liquid conveying pipeline
40. Air compressor
41. Gas flowmeter
42. Gas valve
43. Gas delivery pipeline
101. Biomass denitration water agent storage equipment
102. Aqueous agent unloading and circulating system
103. Aqueous agent unloading and circulating system
104. Liquid level measuring device
105. Pump delivery device
106. Flow metering device
107. Pressure detection device
108. Single fluid spray gun apparatus
301. Pump delivery device
302. Flow metering device
303. Pressure detection device
304. Two-fluid atomization spray gun equipment
305. Compressed air device
201. Biomass denitration mixture storage equipment
202. Valve device
203. Feeding equipment
204. Metering device
205. Pump delivery device
206. Compressed air device
207. Pneumatic conveying pipeline
208. Material and air separation bin
209. Mixture charging tube
Detailed Description
For a better understanding of the present application, the contents of the present application will be further described below with reference to examples, but the contents of the present application are not limited to only the following examples. The experimental operations described in the following examples are all routine operations unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified. The cyclones used in the examples and comparative examples are five-stage cyclones, and thus the C5 cyclone is the lowermost stage cyclone.
Example 1: position 1+ position 3
The biomass denitration mixture comprises the following components in percentage by mass: 50% of biomass carbon powder, 40% of graphite mineral powder and 10% of biomass cracking liquid. The biomass denitration water agent comprises the following components in percentage by mass: the water content is 45%, the biomass lysate is 35%, and the methanol is 20%.
The embodiment is used on a 5000t/d novel dry method cement production line in Guangdong, and the actual concentration monitoring of NOx in flue gas is 1010mg/m3. Adopt this application the system, placed a living beings denitration aqueous solution storage tank and living beings denitration mixing agent storage storehouse on ground. Adding a biomass denitration mixture through a mixture inlet 1m above an expansion joint (position 1) of a kiln tail smoke chamber by a feeding pipe; and (3) spraying a biomass denitration water agent at the inlet part (position 3) of the C5 cyclone air pipe through a multistage centrifugal pump and a water agent spray gun. Spraying 6 double-fluid spray guns arranged at the position 3 of the biomass denitration water agent at intervals of 60 degrees on the same plane, and atomizing the denitration water agent into the denitration water agent by utilizing high-pressure air<Droplets of 10 μm or less. The biomass denitration mixture is added through 1 feeding pipe at the position 1. The adding amount of the biomass denitration mixture is 1t/h (about 0.3 percent of the feeding amount of the cement raw materials), the spraying amount of the biomass denitration water agent is 800L/h (about 0.2 percent of the feeding amount of the cement raw materials), and the concentration of NOx in the flue gas can be stabilized at 50mg/m after 10 minutes3The lowest possible level is 46mg/m3And the cement kiln flue gas denitration efficiency reaches 95.5%.
Example 2: position 1+ position 3
The biomass denitration mixture comprises the following components in percentage by mass: 50% of biomass carbon powder, 40% of graphite mineral powder and 10% of biomass cracking liquid. The biomass denitration water agent comprises the following components in percentage by mass: the water content is 45%, the biomass lysate is 35%, and the methanol is 20%.
The embodiment is located inUsed on a 5000t/d novel dry method cement production line in Guangdong, the actual concentration monitoring of NOx in flue gas is 990mg/m3. Adopt this application the system, placed a living beings denitration aqueous solution storage tank and living beings denitration mixing agent storage storehouse on ground. Adding a biomass denitration mixture through a material spreading box at a mixture inlet 1m above an expansion joint (position 1) of a kiln tail smoke chamber; and (3) spraying a biomass denitration water agent on an ascending part (position 3, 1m away from the outlet of the decomposing furnace) of a connecting air pipe between the outlet of the decomposing furnace and the inlet of the lowest stage of cyclone cylinder through a multistage centrifugal pump and a water agent spray gun. Spraying the biomass denitration water agent at a third position through 4 single-fluid spray guns which are arranged on the same plane at intervals of 90 degrees, and atomizing the denitration water agent into the denitration water agent by utilizing high-pressure air<Droplets of 10 μm or less. The biomass denitration mixture is added through 1 spreading box at a first position. The adding amount of the biomass denitration mixture is 1.5t/h (about 0.4 percent of the feeding amount of the cement raw materials), the spraying amount of the biomass denitration water agent is 800L/h (about 0.3 percent of the feeding amount of the cement raw materials), and the concentration of NOx in the flue gas can be stabilized at 50mg/m after 10 minutes3The minimum value can be 41mg/m3And the cement kiln flue gas denitration efficiency reaches 96%.
Example 3: position 1+ position 3
The biomass denitration mixture comprises the following components in percentage by mass: 50% of biomass carbon powder, 40% of graphite mineral powder and 10% of biomass cracking liquid. The biomass denitration water agent comprises the following components in percentage by mass: the water content is 45%, the biomass lysate is 35%, and the methanol is 20%.
The embodiment is used on a 5000t/d novel dry method cement production line in Guangdong, and the actual concentration of NOx in flue gas is monitored to be 980mg/m3. Adopt this application the system, placed a living beings denitration aqueous solution storage tank and living beings denitration mixing agent storage storehouse on ground. Adding a biomass denitration mixture at a mixture inlet 1m above an expansion joint (position 1) of a kiln tail smoke chamber through a feeding pipe; and (3) spraying a biomass denitration water agent at a connecting air pipe (position 3, 2 m away from the outlet of the lowest stage cyclone cylinder) between the lowest stage cyclone cylinder and the penultimate stage cyclone cylinder through a multistage centrifugal pump and a water agent spray gun. The biomass denitration water agent is arranged at the third positionSpraying 4 single fluid spray guns arranged on the same plane at intervals of 90 degrees, and atomizing the denitration water agent into the denitration water agent by using high-pressure air<Droplets of 10 μm or less. The substance denitration mix was added through 1 feed tube at position 1. The adding amount of the biomass denitration mixture is 1.5t/h (about 0.4 percent of the feeding amount of the cement raw materials), the spraying amount of the biomass denitration water agent is 800L/h (about 0.3 percent of the feeding amount of the cement raw materials), and the concentration of NOx in the flue gas can be stabilized at 50mg/m after 10 minutes3At the lowest, 33mg/m3And the cement kiln flue gas denitration efficiency reaches 96.6%.
Example 4: position 1+ position 3
The biomass denitration mixture comprises the following components in percentage by mass: 45% of biomass carbon powder, 45% of graphite mineral powder and 10% of biomass cracking liquid. The biomass denitration water agent comprises the following components in percentage by mass: the water content is 45%, the biomass lysate is 35%, and the isobutanol is 20%.
The embodiment is used on a 5000t/d novel dry method cement production line positioned in Guangdong, and the actual concentration monitoring of NOx in flue gas is 1000mg/m3. Adopt this application the system, placed a living beings denitration aqueous solution storage tank and living beings denitration mixing agent storage storehouse on ground. Transferring the denitration mixture in a biomass denitration mixture storage bin on the ground to a material-air separation bin near a position 1 (1 m above an expansion joint of a kiln tail smoke chamber) through a pneumatic pump, and adding the mixture to the position 1 through a metering feeder through a mixture inlet; and (3) spraying a biomass denitration water agent on an ascending part (position 3-1 and 5 meters away from the outlet of the decomposing furnace) of a connecting air pipe between the outlet of the decomposing furnace and the inlet of the lowest stage of cyclone cylinder and on an inlet part (position 3-2) of a C5 cyclone cylinder air pipe through a multistage centrifugal pump and a water agent spray gun. The biomass denitration water agent is sprayed at two third positions through 4 single-fluid spray guns which are arranged on the same plane at intervals of 90 degrees, and the high-pressure air is utilized to atomize the denitration water agent into the denitration water agent<Droplets of 10 μm or less. The adding amount of the biomass denitration mixture is 1.5t/h (about 0.4 percent of the feeding amount of the cement raw materials), the spraying amount of the biomass denitration water agent is 800L/h (about 0.3 percent of the feeding amount of the cement raw materials), and the concentration of NOx in the flue gas can be stabilized at 30mg/m after 10 minutes3The minimum amount of the metal oxide particles is 20mg/m3And the cement kiln flue gas denitration efficiency reaches 98%.
Example 5: position 1+ position 3
The biomass denitration mixture comprises the following components in percentage by mass: 30% of biomass carbon powder, 65% of graphite mineral powder and 5% of biomass cracking liquid. The biomass denitration water agent comprises the following components in percentage by mass: 50% of water content, 25% of biomass lysate and 25% of glycerol.
The embodiment is used on a 5000t/d novel dry method cement production line positioned in Guangdong, and the actual concentration monitoring of NOx in flue gas is 1000mg/m3. Adopt this application the system, placed a living beings denitration aqueous solution storage tank and living beings denitration mixing agent storage storehouse on ground. Transferring the denitration mixture in a biomass denitration mixture storage bin on the ground to a material-air separation bin near a position 1 (1 m above an expansion joint of a kiln tail smoke chamber) through a pneumatic pump, and adding the mixture to the position 1 through a metering feeder through a mixture inlet; and (3) spraying a biomass denitration water agent at the inlet part (position 3) of the C5 cyclone air pipe through a multistage centrifugal pump and a water agent spray gun. Spraying the biomass denitration water agent at a third position through 4 single-fluid spray guns which are arranged on the same plane at intervals of 90 degrees, and atomizing the denitration water agent into the denitration water agent by utilizing high-pressure air<Droplets of 10 μm or less. The adding amount of the biomass denitration mixture is 1.5t/h (about 0.4 percent of the feeding amount of the cement raw materials), the spraying amount of the biomass denitration water agent is 800L/h (about 0.3 percent of the feeding amount of the cement raw materials), and the concentration of NOx in the flue gas can be stabilized at 70mg/m after 10 minutes3The minimum value can be 53mg/m3And the cement kiln flue gas denitration efficiency reaches 94.7%.
Example 6: position 1
The biomass denitration mixture comprises the following components in percentage by mass: 50% of biomass carbon powder, 40% of graphite mineral powder and 10% of biomass cracking liquid.
The embodiment is used on a 5000t/d novel dry method cement production line in Guangdong, and the actual concentration monitoring of NOx in flue gas is 1020mg/m3. Adopt this application the system, placed a living beings denitration mixture storage bin on ground. Passing through the charging pipe at the position 1m above the expansion joint of the kiln tail smoke chamber1) The biomass denitration mixture is added at the mixture inlet. The adding amount of the biomass denitration mixture is 1t/h (about 0.3 percent of the feeding amount of cement raw meal). After 10 minutes, the concentration of NOx in the smoke can be stabilized at 200mg/m3The minimum value can reach 155mg/m3And the cement kiln flue gas denitration efficiency reaches more than 85%.
Before the biomass denitration mixing agent is put into use, coal for the kiln tail is about 20t/h, after the biomass denitration mixing agent is put into use, the coal for the kiln tail is about 14t/h, and the coal saving rate is 30%.
Example 7: position 1 and position 2
The biomass denitration mixture comprises the following components in percentage by mass: 50% of biomass carbon powder, 40% of graphite mineral powder and 10% of biomass cracking liquid. The biomass denitration water agent comprises the following components in percentage by mass: the water content is 45%, the biomass lysate is 35%, and the methanol is 20%.
The embodiment is used on a 5000t/d novel dry method cement production line positioned in Guangdong, and the actual concentration of NOx in flue gas is monitored to be 970mg/m3. Adopt this application the system, placed a living beings denitration aqueous solution storage tank and living beings denitration mixing agent storage storehouse on ground. Adding a biomass denitration mixture at a mixture inlet 1m above an expansion joint (position 1) of a kiln tail smoke chamber through a feeding pipe; spraying a biomass denitration aqueous agent at a position (position 2) 2 m above an expansion joint of a kiln tail smoke chamber through a multistage centrifugal pump and an aqueous agent spray gun; spraying the biomass denitration water agent by 6 double-fluid spray guns arranged on the same plane at intervals of 90 degrees, and atomizing the denitration water agent into the denitration water agent by utilizing high-pressure air<Droplets of 10 μm or less. The biomass denitration mixture is sprayed through 1 spray gun at a first position. The adding amount of the biomass denitration mixture is 1.5t/h (about 0.4 percent of the feeding amount of the cement raw materials), the spraying amount of the biomass denitration water agent is 800L/h (about 0.3 percent of the feeding amount of the cement raw materials), and the concentration of NOx in the flue gas can be stabilized at 120mg/m after 10 minutes3The minimum value can be 107mg/m3And the cement kiln flue gas denitration efficiency is about 89%.
Example 8: preparation of biomass denitration mixture
Collecting about 10 tons of corn straws, isolating air in a carbonization furnace, heating to about 620 ℃, carbonizing to obtain about 3 tons of carbon-containing solid products (namely biomass charcoal), and grinding to the fineness of 200 meshes. The biomass denitration mixtures used in examples 1, 2, 4, and 7 and comparative examples were prepared from the obtained biomass charcoal powder, graphite ore powder, and biomass lysate (obtained according to example 9).
Example 9: preparation of biomass denitration mixture
Collecting about 5 tons of dried fruit shells, isolating the fruit shells from air in a carbonization furnace, heating the fruit shells to about 730 ℃, carbonizing the fruit shells to obtain about 2 tons of biomass charcoal, and grinding the biomass charcoal to the fineness of 200 meshes. The biomass denitration mixtures used in examples 3, 5 and 6 were prepared from the obtained biomass charcoal powder and graphite ore powder, 0.4 ton biomass lysate (obtained according to example 10).
Example 10: preparation of aqueous biomass denitration agent
Collecting about 10 tons of branches, heating the branches in a gasification furnace without air to 510 ℃ to obtain about 7 tons of biomass cracking liquid, and detecting the biomass cracking liquid to contain C4-C17 hydrocarbon and hydrocarbon oxide. The lysate is relatively viscous. The obtained lysate was mixed with water, methanol or isobutanol, and stirred by a high-speed shear stirring apparatus having a speed of 20000 rpm, to prepare a biomass denitration aqueous solution used in examples 1, 2, and 4 and comparative examples.
Example 11: preparation of aqueous biomass denitration agent
About 6 tons of bagasse are collected, heated in a gasifier without air to 480 ℃ to obtain about 4 tons of biomass lysate, which is detected to contain C4-C17 hydrocarbons and oxygen compounds. The lysate is relatively viscous. The obtained lysate was mixed with water, methanol, or glycerin, and stirred by a high-speed shear stirring apparatus having a speed of 20000 rpm, to prepare the aqueous biomass denitration agent used in examples 3 and 5.
Comparative example 1: individual mixes (position 3)
The biomass denitration mixture comprises the following components in percentage by mass: 50% of biomass carbon powder, 40% of graphite mineral powder and 10% of biomass cracking liquid.
The comparative example is used on a 5000t/d novel dry method cement production line in Guangdong, and the actual concentration monitoring of NOx in flue gas is 1050mg/m3. By passingA biomass denitration mixture is added into a mixture inlet of a feeding pipe C5 cyclone air pipe inlet part (position 3); the biomass denitration mixture is sprayed through 1 spray gun at a first position. The adding amount of the biomass denitration mixture is 1.5t/h (about 0.4 percent of the feeding amount of cement raw meal), and the concentration of NOx in the flue gas can be stabilized at 500mg/m after 10 minutes3The minimum value can be 335mg/m3And the flue gas denitration efficiency of the cement kiln is only 68 percent.
Comparative example 2: aqueous single agent (position 1)
The biomass denitration water agent comprises the following components in percentage by mass: the water content is 45%, the biomass lysate is 35%, and the methanol is 20%.
The comparative example is used on a 5000t/d novel dry method cement production line in Guangdong, and the actual concentration monitoring of NOx in flue gas is 950mg/m3Left and right. The spraying system in the prior art is used, 1000L/h (about 0.25 percent of raw material feeding amount) of biomass denitration water agent is sprayed at a position (position 1) 1m below the tail end of the tertiary air duct through a water agent spray gun, 4 single-fluid spray guns are arranged on the same plane at intervals of 90 degrees, and the denitration water agent is atomized into high-pressure air<Droplets of 10 μm or less. After 10 minutes, the concentration of NOx in the smoke is stabilized at 250mg/m3About, cement kiln flue gas denitration efficiency is only 73.9%.
Comparative example 3: position 1 (control)
The biomass denitration contrast agent comprises the following components in percentage by mass: 50% of biomass carbon powder and 50% of graphite mineral powder.
The embodiment is used on a 5000t/d novel dry method cement production line positioned in Guangdong, and the actual concentration monitoring of NOx in flue gas is 1030mg/m3. With the system described herein, a biomass agent storage bin is placed on the ground. Adding a biomass denitration contrast agent through a feeding pipe through a mixing agent inlet 1m above an expansion joint (position 1) of a kiln tail smoke chamber. The addition amount of the biomass denitration control agent is 1.5t/h (about 0.4% of the feeding amount of cement raw meal). After 10 minutes, the concentration of NOx in the smoke can be stabilized at 300mg/m3The lowest can reach 248mg/m3And the denitration efficiency of the flue gas of the cement kiln is only 76%.
Comparative example 4:
the comparative example is used on a 5000t/d novel dry method cement production line in Guangdong, and the actual concentration monitoring of NOx in flue gas is 800mg/m3. By using the prior art (SNCR selective non-catalytic reduction) spraying system, 900L/h (about 0.25 percent of raw material feeding amount) of ammonia water with the concentration of 20 percent is sprayed at the outlet of the decomposing furnace through a water agent spray gun, 8 spray guns are arranged at an interval of 45 degrees on the same plane, and the denitration water agent is atomized into denitration water agent by utilizing high-pressure air<Droplets of 10 μm or less. After 10 minutes, the concentration of NOx in the smoke can be stabilized at 350mg/m3About, flue gas denitration efficiency is only 56%.
The coal used at the tail of the kiln is about 20t/h when the production line runs smoothly.
Table 1: denitration efficiency summary table
As can be seen from the above examples and comparative examples, firstly, the denitration agent provided in the manner defined by the system of the present application has higher denitration efficiency; in addition, the position selected in the present application has a more excellent denitration effect than other positions. If the two are combined, an economic, environment-friendly and efficient denitration technical scheme can be further obtained, and the technical effect of the scheme cannot be achieved by all the prior art at present.
Although the present invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (19)
1. The utility model provides a novel dry process is living beings deNOx systems for cement kiln, characterized by, including the blending agent interpolation device that is used for adding living beings denitration blending agent, the blending agent interpolation device is including the blending agent entry that is located the rotary kiln tail end of cement kiln to the first position department between the tertiary tuber pipe tail end.
2. The biomass denitration system for the cement kiln according to claim 1, wherein the admixture adding device further comprises any one of:
1) a mixture spray gun;
2) a material-air separation bin, a metering feeder or a combination thereof; or
3) A feed tube, or a spreading box, or a combination thereof.
3. The biomass denitration system for the cement kiln according to claim 1 or 2, wherein the number of the mixture inlet is one or more.
4. The biomass denitration system for cement kiln according to claim 3, wherein the mixing agent inlet is a plurality of inlets which are symmetrically distributed.
5. The biomass denitration system for cement kilns according to claim 1 or 2, wherein the first position is located at or above a kiln tail smoke chamber.
6. The biomass denitration system for the cement kiln according to claim 1 or 2, characterized by further comprising a water agent adding device located at a third position between the rear section of the decomposing furnace and the inlet of the lowest stage cyclone and/or between the outlet of the lowest stage cyclone and the inlet of the penultimate cyclone.
7. The biomass denitration system for cement kilns according to claim 6, wherein the third position is located between the rear section of the decomposing furnace and the inlet of the lowest stage cyclone.
8. The biomass denitration system for cement kilns according to claim 6, wherein the third position is located between the outlet of the lowest stage cyclone and the inlet of the penultimate cyclone.
9. The biomass denitration system for cement kiln according to claim 2, wherein when said admixture adding means comprises 1) an admixture spray gun, said admixture adding means further comprises: a mixing agent storage bin, a dust collector, a metering feeder, a pneumatic conveying pump, a Roots blower, a mixing agent pipeline, a compressed air pipeline and a valve.
10. The biomass denitration system for cement kilns as claimed in claim 2, wherein when said mixing agent adding means comprises 2) a material wind separating bin, or a metering feeder, or a combination thereof, said mixing agent adding means further comprises a mixing agent storage bin, a dust collector, a pneumatic conveying pump, a roots blower, a mixing agent pipeline, a compressed air pipeline, and a valve.
11. The biomass denitration system for cement kiln as recited in claim 2, wherein when said admixture adding means comprises 3) a feed pipe, or a hopper, or a combination thereof, said admixture adding means further comprises an admixture storage bin, a dust collector, a pneumatic transfer pump, a roots blower, an admixture pipe, a compressed air pipe, and a valve.
12. The biomass denitration system for the cement kiln as claimed in any one of claims 9 to 11, wherein the pneumatic conveying pump adopts a roots blower or compressed air as a gas source.
13. The biomass denitration system for cement kilns according to claim 6, wherein the third position is located at an upstream part of a connecting air pipe between the outlet of the decomposing furnace and the inlet of the lowest stage cyclone.
14. The biomass denitration system for cement kilns according to claim 6, wherein the third position is located at a downstream portion of a connecting air pipe between the outlet of the decomposing furnace and the inlet of the lowest stage cyclone.
15. The biomass denitration system for cement kiln according to claim 6, wherein the third position is located at the outlet of the decomposing furnace and/or the inlet part of the lowest stage cyclone.
16. The biomass denitration system for the cement kiln according to claim 5, wherein the upper portion of the kiln tail smoke chamber refers to the range from the upper portion of the kiln tail smoke chamber to the lower portion of the tail end of the tertiary air duct.
17. The biomass denitration system for cement kilns according to claim 5, wherein the first position is located above a kiln tail smoke chamber expansion joint.
18. The biomass denitration system for the cement kiln according to claim 17, wherein the upper part of the expansion joint of the kiln tail smoke chamber is the range from the upper part of the expansion joint to the lower part of the tail end of the tertiary air pipe.
19. The biomass denitration system for the cement kiln according to claim 6, wherein the aqueous agent adding device is an aqueous agent spray gun.
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Address after: 510000 full floor unit, 4th floor, No. 166, Huangpu Park West Road, Huangpu District, Guangzhou, Guangdong Province (office only) Patentee after: Guangdong Wanyin Technology Co.,Ltd. Address before: 510000 Guangzhou City, Guangdong Province 202, building 1, No. 34, Shuiyin Siheng Road, Tianhe District, Guangzhou City, Guangdong Province Patentee before: GUANGDONG WANYIN SCIENCE AND TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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