CN115490442A - Method for reducing emission of nitric oxide in sleeve lime kiln - Google Patents
Method for reducing emission of nitric oxide in sleeve lime kiln Download PDFInfo
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- CN115490442A CN115490442A CN202211168109.7A CN202211168109A CN115490442A CN 115490442 A CN115490442 A CN 115490442A CN 202211168109 A CN202211168109 A CN 202211168109A CN 115490442 A CN115490442 A CN 115490442A
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- Prior art keywords
- lime kiln
- combustion
- air
- sleeve lime
- sleeve
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 134
- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 132
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 132
- 239000004571 lime Substances 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000002485 combustion reaction Methods 0.000 claims abstract description 69
- 239000007789 gas Substances 0.000 claims abstract description 42
- 239000002737 fuel gas Substances 0.000 claims abstract description 41
- 239000000428 dust Substances 0.000 claims abstract description 29
- 238000007664 blowing Methods 0.000 claims abstract description 26
- 239000000446 fuel Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 21
- 239000004744 fabric Substances 0.000 claims description 14
- 238000011068 loading method Methods 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 239000000741 silica gel Substances 0.000 claims description 8
- 229910002027 silica gel Inorganic materials 0.000 claims description 8
- 230000008901 benefit Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 4
- 239000010425 asbestos Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 4
- 239000006028 limestone Substances 0.000 claims description 4
- 229910052895 riebeckite Inorganic materials 0.000 claims description 4
- 239000000567 combustion gas Substances 0.000 claims 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 239000001301 oxygen Substances 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 11
- 239000000243 solution Substances 0.000 description 9
- 230000007613 environmental effect Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
Abstract
Embodiments of the present application provide a method of reducing nitrogen oxide emissions from a sleeve lime kiln for use in a process for performing production based on the sleeve lime kiln, the method comprising: s1, limiting non-combustion-supporting air from entering the sleeve lime kiln, comprising the following steps: the integral air leakage rate in the sleeve lime kiln is reduced; the blowing air pressure of the deashing gas of the pulse blowing bag dust remover is reduced and the blowing pulse width is improved; reducing air entering the sleeve lime kiln during charging; s2, limiting the generation of nitrogen oxides in the combustion process of the fuel gas, comprising the following steps: fully mixing fuel gas and combustion-supporting air, and inputting the mixture into the sleeve lime kiln for combustion so as to control the fuel gas to generate flameless combustion; mixing fuel gas and combustion-supporting air according to a set air-fuel ratio; controlling the temperature of the gas in the combustion process. This application can restrict non-combustion-supporting air and get into in the sleeve limekiln and restriction gas generate nitrogen oxide in combustion process, realize reducing the purpose that sleeve limekiln nitrogen oxide discharged.
Description
Technical Field
The application relates to the technical field of lime kiln production, in particular to a method for reducing emission of nitric oxide in a sleeve lime kiln.
Background
The nitrogen oxide discharged in the production of the lime kiln is one of the sources of environmental pollution, and is always among the important points of environmental protection management and control, and particularly since the implementation of the notice on the special requirements on the discharge of the atmospheric pollutants in the steel thermal power industry, the requirements on the nitrogen oxide discharged in the production of the lime kiln are stricter.
Based on this, how to reduce the emission of the nitrogen oxides in the lime kiln is a technical problem to be solved urgently.
Disclosure of Invention
The embodiment of the application provides a method for reducing emission of nitric oxide in a sleeve lime kiln, which can limit non-combustion-supporting air from entering the sleeve lime kiln and limit fuel gas from generating nitric oxide in a combustion process, so that the aim of reducing emission of nitric oxide in the sleeve lime kiln is fulfilled.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.
According to an aspect of an embodiment of the present application, there is provided a method of reducing lime kiln sleeve nitrogen oxide emissions for use in a process for performing production based on the lime kiln sleeve, the method comprising: s1, limiting non-combustion-supporting air from entering the sleeve lime kiln, comprising the following steps: the integral air leakage rate in the sleeve lime kiln is reduced; the blowing air pressure of the deashing gas of the pulse blowing bag dust remover is reduced and the blowing pulse width is improved; reducing air entering the sleeve lime kiln during charging; s2, limiting the generation of nitrogen oxides in the combustion process of the fuel gas, comprising the following steps: fully mixing fuel gas and combustion-supporting air, and inputting the mixture into the sleeve lime kiln for combustion so as to control the fuel gas to generate flameless combustion; mixing fuel gas and combustion air according to a set air-fuel ratio; controlling the temperature of the gas in the combustion process.
In some embodiments of the present application, the method for reducing the overall air leakage rate in the sleeve lime kiln comprises the following steps: guarantee the door frame of sleeve lime kiln top apron and the roughness of door plant, after overhauing sleeve lime kiln top apron at every turn and finishing, adopt the high temperature resistant sealing strip of silica gel to seal during the assembly, the high temperature resistant sealing strip of periodic replacement silica gel to compress tightly the door with apron upper portion briquetting.
In some embodiments of the present application, based on the foregoing solution, the method for reducing the overall air leakage rate in a sleeve lime kiln further includes: the method has the advantages that the cloth bag at the tail of the sleeve lime kiln is always in a sealed state, the cloth bag is replaced in time after being damaged, and the temperature of the system is kept at 20 ℃ so as to prevent the cloth bag from being damaged.
In some embodiments of the present application, based on the foregoing solution, the method for reducing the overall air leakage rate in the sleeve lime kiln further includes: the sealing degree of the lower hole door of the sleeve lime kiln and the flange of the ash discharge valve is ensured, the mixture of asbestos ropes and glass cement is adopted during sealing, and screws for additionally mounting gaskets are adopted during assembly.
In some embodiments of the present application, based on the foregoing solution, the reducing of the blowing air pressure of the ash removal gas of the pulse blowing bag dust collector and the increasing of the blowing pulse width include: the blowing air pressure of the dust cleaning gas of the pulse blowing bag dust collector is reduced from 0.4MPa to 0.25-0.30 MPa, and the blowing pulse width is increased from 150ms to 250ms.
In some embodiments of the present application, based on the foregoing solution, the reducing air entering the sleeve lime kiln during the loading process comprises: the time for opening the intermediate bin of the sleeve lime kiln in the feeding process is reduced from 90 seconds to 40 seconds so as to reduce air entering the sleeve lime kiln in the feeding process.
In some embodiments of the present application, based on the foregoing solution, the reducing air entering the sleeve lime kiln during the loading process further comprises: and stopping rotating the sleeve lime kiln rotary distributor in the process of waiting for loading, performing material pressing sealing, and increasing the material pressing time of a material cup from 10 seconds to 120 seconds so as to reduce air entering the sleeve lime kiln in the loading process.
In some embodiments of the present application, based on the foregoing scheme, the mixing gas and combustion air according to a set air-fuel ratio includes: according to the following steps: 1.5, mixing fuel gas and combustion air, wherein the heat value of the fuel gas is controlled between 1700 and 1800Kkcal.
In some embodiments of the present application, based on the foregoing solution, the controlling the temperature of the fuel gas in the combustion process includes: the low-nitrogen burner is adopted, so that flame generated by the gas in the combustion process is uniformly distributed, and the condition of overhigh temperature of the gas in the combustion process is avoided.
In some embodiments of the present application, based on the foregoing solution, the controlling the temperature of the fuel gas in the combustion process further includes: and a PLC control mode based on input heat is adopted, based on the heat required by decomposing limestone, the heat value of the fuel gas, the heat consumption and the output required by the product are obtained through an online heat value instrument, and the fuel gas supply quantity and the secondary air quantity of a combustion chamber in the sleeve lime kiln are regulated and controlled.
In the technical scheme provided by some embodiments of the application, the measured content of oxygen in the sleeve lime kiln discharge can be reduced by reducing the integral air leakage rate in the sleeve lime kiln, so that the value of the excess air coefficient is reduced; and the generation of nitrogen oxides in the combustion process of the fuel gas is limited, so that the measured content of the nitrogen oxides in the emission of the sleeve lime kiln is reduced, and the aim of reducing the emission of the nitrogen oxides in the sleeve lime kiln is fulfilled.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 shows a graph comparing the results of an experiment using one embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
It should be noted that the application is applied to the process of producing the sleeve lime kiln. The sleeve lime kiln is one kind of lime kiln, and the sleeve lime kiln is operated under negative pressure and has the advantages of low heat consumption, simple structure and high fuel adaptability. Compared with the traditional lime kiln, the lime in the sleeve lime kiln is calcined in the annular space with more uniform air flow distribution, so that the produced lime has higher quality and higher activity, and the lime kiln is more suitable for the steel industry or the chemical industry utilizing coke oven gas and calcium carbide.
It should also be noted that the lime kiln muffle nitrogen oxide emissions are determined from the excess air factor and the measured content of nitrogen oxide in the lime kiln muffle emissions, the lime kiln muffle nitrogen oxide emissions = the excess air factor x the measured content of nitrogen oxide. Wherein the excess air coefficient is the ratio of the actual air requirement and the theoretical air requirement during fuel combustion, and is expressed by 'alpha', alpha = (21-8)/(21-measured oxygen content), wherein 21 is the content of oxygen in the atmosphere, 8 is the standard emission concentration to be converted, the standard emission concentration to be converted into 8% state is expressed, the measured oxygen content is the sleeve stoneThe measured oxygen content of the ash kiln discharge may be measured by a measuring instrument disposed in the flue of the sleeve lime kiln. For example, if the measured oxygen content in the discharge from a sleeve lime kiln is 13%, then a = (21-8)/(21-13), α =1.625 can be calculated. And judging whether the emission exceeds the standard or not according to the converted emission of the nitric oxides of the sleeve lime kiln. In particular, the environmental protection requires that the emission concentration is not more than 100mg/m 3 。
The implementation details of the technical solution of the embodiment of the present application are set forth in detail below:
in the present application, the method for reducing the emission of nitrogen oxides in a sleeve lime kiln can comprise steps S1 to S2, which are described in detail as follows:
step S1, limiting non-combustion-supporting air from entering the sleeve lime kiln, comprising the following steps: the integral air leakage rate in the sleeve lime kiln is reduced; the blowing air pressure of the dust cleaning gas of the pulse blowing bag dust remover is reduced and the blowing pulse width is improved; reducing air entering the sleeve lime kiln during charging.
In step S1, the reducing the overall air leakage rate in the sleeve lime kiln may include: guarantee the door frame of sleeve lime kiln top apron and the roughness of door cover board, after overhauing sleeve lime kiln top apron at every turn and finishing, adopt the high temperature resistant sealing strip of silica gel to seal during the assembly, regularly change the high temperature resistant sealing strip of silica gel to compress tightly the door with apron upper portion briquetting.
Specifically, should guarantee that the door frame and the door slab of dust remover top apron level in this sleeve lime kiln, overhaul sleeve lime kiln top apron at every turn and finish after, adopt the high temperature resistant sealing strip of silica gel to seal during the assembly, change this high temperature resistant sealing strip of silica gel once every three years to compress tightly the door with apron upper portion briquetting, the sealed condition of periodic inspection. When the dust collector dust accumulation hopper is used for removing dust and discharging dust, part of the dust should be reserved, the effect of sealing the dust collector can be achieved, and the probability that outside air enters the sleeve lime kiln is reduced.
The method for reducing the integral air leakage rate in the sleeve lime kiln can also comprise the following steps: the method has the advantages that the cloth bag at the tail of the sleeve lime kiln is always in a sealed state, the cloth bag is replaced in time after being damaged, and the temperature of the system is kept at 20 ℃ so as to prevent the cloth bag from being damaged.
Specifically, a cloth bag at the kiln tail of the sleeve lime kiln is periodically checked to ensure that the cloth bag at the kiln tail of the sleeve lime kiln is always in a sealed state, the cloth bag is timely replaced after the cloth bag is damaged, the temperature of the system is kept at 20 ℃, and particularly, when the temperature is low in winter, a pulse system at the top of a dust collector needs to be covered by tarpaulin to preserve heat so as to prevent the cloth bag from being damaged possibly.
The method for reducing the integral air leakage rate in the sleeve lime kiln can also comprise the following steps: the sealing degree of the lower hole door of the sleeve lime kiln and the flange of the ash discharge valve is ensured, the mixture of the asbestos rope and the glass cement is adopted during sealing, and screws for additionally mounting gaskets are adopted during assembly.
Specifically, when the lower hole door and the ash discharge valve flange of the sleeve lime kiln are sealed by a mixture of asbestos ropes and glass cement, whether the sealing is complete can be judged by the sound of air leakage.
In this application, through easily leaking some prevention and sealing process such as to dust remover top cap, pulse jetting bag, can reduce the whole air leakage rate in the sleeve limekiln, reach the non-combustion-supporting air of restriction and get into effect in the sleeve limekiln.
Reduce the jetting atmospheric pressure of pulse jetting bag dust remover deashing gas and improve jetting pulse width, can include: the blowing air pressure of the dust cleaning gas of the pulse blowing bag dust collector is reduced from 0.4MPa to 0.25-0.30 MPa, and the blowing pulse width is increased from 150ms to 250ms.
Specifically, pulse jetting bag dust remover deashing gas comes from compressed air, but the compressed air that spouts is the malleation, can cause the influence to the actual measurement assay of oxygen in the sleeve limekiln emission, through reducing jetting atmospheric pressure and improving jetting pulse width in order to reduce the jetting number of times, both can protect this pulse jetting bag not appear damaged, can also guarantee that this pulse jetting bag high efficiency work and deashing effect are showing.
In this application, through reducing the compressed air that spouts in the pulse jetting bag dust remover, can reduce the whole air leak rate in the sleeve limekiln, reach and restrict non-combustion-supporting air and get into effect in the sleeve limekiln.
The reducing of air entering the sleeve lime kiln during charging may include: the time for opening the intermediate bin of the sleeve lime kiln in the feeding process is reduced from 90 seconds to 40 seconds, so that the air entering the sleeve lime kiln in the feeding process is reduced.
Specifically, in the feeding process of the feeding trolley, the opening time of the intermediate bin is reduced from 90 seconds to 40 seconds.
The reducing air entering the sleeve lime kiln during the charging process may further include: and stopping rotating the sleeve lime kiln rotary distributor in the process of waiting for loading, pressing and sealing, and increasing the pressing time of a material cup from 10 seconds to 120 seconds so as to reduce air entering the sleeve lime kiln in the loading process.
Specifically, in the process of waiting for loading, the rotary distributor of the sleeve lime kiln stops rotating, meanwhile, material pressing sealing is carried out in a middle bin of the sleeve lime kiln, and the material pressing time of a material cup is increased from 10 seconds to 120 seconds.
In this application, through revising the automatic feeding procedure, can reduce the probability that outside air got into this sleeve limekiln to can reduce the whole gas leak rate in the sleeve limekiln, reach the restriction non-combustion-supporting air and get into effect in the sleeve limekiln.
In an embodiment of the application, periodic inspection can be carried out on intermediate link equipment, other monitoring equipment and system leakage points from a sleeve lime kiln waste gas outlet to a flue gas outlet, such as a heat exchanger, a waste gas fan, a dust remover and a dust removing fan, so that the integral air leakage rate in the sleeve lime kiln is reduced, and the effect of limiting non-combustion-supporting air from entering the sleeve lime kiln is achieved.
S2, limiting the generation of nitrogen oxides in the combustion process of the fuel gas, comprising the following steps: fully mixing fuel gas and combustion-supporting air, and inputting the mixture into the sleeve lime kiln for combustion so as to control the fuel gas to generate flameless combustion; mixing fuel gas and combustion air according to a set air-fuel ratio; the temperature of the gas in the combustion process is controlled.
In step S2, the mixing of the gas and the combustion air according to the set air-fuel ratio may include: according to the following steps of 1:1.5, mixing fuel gas and combustion air, wherein the heat value of the fuel gas is controlled between 1700 and 1800Kkcal.
It should be noted that there are three main types of nitrogen oxides produced by combustion in a sleeve lime kiln: thermal, rapid and fuel types. When the temperature in the sleeve lime kiln is more than 1250 ℃, nitrogen and oxygen react to generate thermal nitrogen oxide; when the coefficient of the excess air in the sleeve lime kiln is less than 1, rapid nitrogen oxide can be generated; when nitrogen elements of fuel gas in the sleeve lime kiln are subjected to a series of oxidation-reduction reactions in the combustion process, fuel type nitrogen oxides are generated, and the nitrogen oxides generated by the sleeve lime kiln are the most.
Specifically, the fuel gas can be coal gas, and whether the combustion process is sufficient can be judged according to the content of carbon monoxide and oxygen in the flue gas generated by combustion in the sleeve lime kiln. And then according to the ratio (air-fuel ratio) of gas and air, determining the input quantity of combustion air so as to keep the air-fuel ratio in an optimal range, namely, the ratio of 1:1.5 of the mixture of gas and combustion air. Meanwhile, the heat value of the fuel gas is controlled to be 1700-1800 Kkcal.
In the application, through the operation, the flameless combustion of the fuel gas can be controlled, the thermal decomposition and oxidation of the fuel type nitrogen oxide in the combustion process can be avoided, the generation of the fuel type nitrogen oxide can be inhibited, and the effect of limiting the generation of the nitrogen oxide in the combustion process of the fuel gas can be achieved.
The controlling the temperature of the gas in the combustion process may include: the low-nitrogen burner is adopted, so that flame generated by the gas in the combustion process is uniformly distributed, and the condition of overhigh temperature of the gas in the combustion process is avoided.
Specifically, the low-nitrogen burner can be used and the structural design of the low-nitrogen burner is optimized, so that the structure and the section size of a combustion air channel are adjusted, the flame generated by the gas in the combustion process is uniformly distributed, and the condition of overhigh temperature of the gas in the combustion process is avoided.
In this application, through above-mentioned operation, can avoid the gas to appear the too high condition of local temperature in combustion process effectively, reduce nitrogen oxide's formation probability, reach the effect that the restriction gas generated nitrogen oxide in combustion process.
The controlling the temperature of the fuel gas in the combustion process may further include: and a PLC control mode based on input heat is adopted, based on the heat required by decomposing limestone, the heat value of the fuel gas, the heat consumption and the output required by the product are obtained through an online heat value instrument, and the fuel gas supply quantity and the secondary air quantity of a combustion chamber in the sleeve lime kiln are regulated and controlled.
Specifically, a PLC control mode based on input heat can be adopted, based on heat required by decomposing limestone, a gas heat value, heat consumption and output required by a product, and a gas ratio of an upper combustion chamber and a lower combustion chamber are obtained through an online heat value instrument, and the gas supply quantity and the secondary air quantity of the combustion chamber in the sleeve lime kiln are regulated and controlled, so that the combustion system in the sleeve lime kiln can be automatically regulated and controlled, and the purposes of optimizing combustion, controlling total heat consumption, saving energy and reducing consumption are achieved.
In the application, the fuel can be adjusted, the flame temperature and the excess air coefficient can be controlled based on a thermal regulation, so that the flame temperature and the air-fuel ratio are in the optimal range, and the effect of limiting the generation of nitrogen oxides in the combustion process of fuel gas can be achieved.
In an embodiment of the application, the occurrence of the phenomenon that smoke and dust block equipment can be reduced by adding an automatic injection system of each channel in the sleeve lime kiln, such as a heat exchanger and an automatic ash removal device of an ejector, or by prolonging the blocking period of the heat exchanger and the ejector and the like, the normal operation of the heat circulation process in the sleeve lime kiln can be ensured, and the generation of nitrogen oxides in the combustion process of fuel gas can be limited. Meanwhile, nitrogen can be used as a power source, and the increase of the actually measured content of oxygen in the emission of the sleeve lime kiln is avoided.
In the technical scheme of the application, non-combustion-supporting air can be limited from entering the sleeve lime kiln, the actual measurement content of oxygen in the emission of the sleeve lime kiln is reduced, and the numerical value of the excess air coefficient is reduced by reducing the integral air leakage rate in the sleeve lime kiln, reducing the injection air pressure of the ash removal gas of the pulse injection bag dust remover, improving the injection pulse width, reducing the air entering the sleeve lime kiln in the feeding process and the like; the gas and the combustion-supporting air are fully mixed and then are input into the sleeve lime kiln for combustion so as to control the gas to generate flameless combustion, the gas and the combustion-supporting air are mixed according to a set air-fuel ratio, the temperature of the gas in the combustion process is controlled, and the like, so that the generation of nitrogen oxide in the combustion process by the gas can be limited, the actually-measured content of the nitrogen oxide in the emission of the sleeve lime kiln is reduced, the emission of the nitrogen oxide in the sleeve lime kiln is reduced, the emission of the sleeve lime kiln reaches the environment-friendly emission standard, and the environmental pollution is reduced.
In order to make the technical solution of the present application more advanced, those skilled in the art will be able to better understand the experimental data obtained by the inventor with reference to fig. 1.
FIG. 1 shows a graph comparing the results of an experiment using one embodiment of the present application.
Referring to FIG. 1, in one embodiment of the present application, the abscissa of FIG. 1 is a time axis and the ordinate is the concentration of the effluent in mg/m 3 The concentrations of the emission of nitrogen oxides from the 01 month to 12 month a sleeve lime kiln and the B sleeve lime kiln are recorded, the fold line 101 reflects the variation of the emission concentration of nitrogen oxides from the 01 month to 12 month a sleeve lime kiln, and the fold line 102 reflects the variation of the emission concentration of nitrogen oxides from the 01 month to 12 month B sleeve lime kiln.
Wherein, the emission concentration of the nitrogen oxide of the B sleeve lime kiln adopts the technical scheme of the application, and the emission concentration of the nitrogen oxide of the B sleeve lime kiln is far lower than that of the A sleeve lime kiln, and the average emission concentration per month is 93mg/m 3 Reduced to 65mg/m 3 And is stably maintained at 100mg/m 3 The following environmental protection requirements are met.
Furthermore, the technical scheme of the application can be used for greatly reducing the emission of nitric oxide in the sleeve lime kiln, achieving the environmental emission standard and reducing environmental pollution, and has obvious effect and obvious social benefit.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the present application is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A method of reducing nitrogen oxide emissions from a sleeve lime kiln, in a process of performing production based on the sleeve lime kiln, the method comprising:
s1, limiting non-combustion-supporting air from entering the sleeve lime kiln, comprising the following steps: the integral air leakage rate in the sleeve lime kiln is reduced; the blowing air pressure of the dust cleaning gas of the pulse blowing bag dust remover is reduced and the blowing pulse width is improved; reducing air entering the sleeve lime kiln during charging;
s2, limiting the generation of nitrogen oxides in the combustion process of the fuel gas, comprising the following steps: fully mixing fuel gas and combustion-supporting air, and inputting the mixture into the sleeve lime kiln for combustion so as to control the fuel gas to generate flameless combustion; mixing fuel gas and combustion air according to a set air-fuel ratio; the temperature of the gas in the combustion process is controlled.
2. The method of claim 1, wherein the reducing the overall air leakage rate in a sleeve lime kiln comprises:
guarantee the door frame of sleeve lime kiln top apron and the roughness of door cover board, after overhauing sleeve lime kiln top apron at every turn and finishing, adopt the high temperature resistant sealing strip of silica gel to seal during the assembly, regularly change the high temperature resistant sealing strip of silica gel to compress tightly the door with apron upper portion briquetting.
3. The method of claim 1, wherein the reducing the overall air leakage rate in a sleeve lime kiln further comprises:
the method has the advantages that the cloth bag at the tail of the sleeve lime kiln is always in a sealed state, the cloth bag is replaced in time after being damaged, and the temperature of the system is kept at 20 ℃ so as to prevent the cloth bag from being damaged.
4. The method of claim 1, wherein reducing the overall air leak rate in a sleeve lime kiln further comprises:
the sealing degree of the lower hole door of the sleeve lime kiln and the flange of the ash discharge valve is ensured, the mixture of asbestos ropes and glass cement is adopted during sealing, and screws for additionally mounting gaskets are adopted during assembly.
5. The method of claim 1, wherein reducing the blowing pressure and increasing the blowing pulse width of the ash removal gas of the pulse-jet bag dust collector comprises:
the blowing air pressure of the deashing gas of the pulse blowing bag dust collector is reduced from 0.4MPa to 0.25-0.30 MPa, and the blowing pulse width is increased from 150ms to 250ms.
6. The method of claim 1, wherein the reducing air entering the sleeve lime kiln during the loading comprises:
the time for opening the intermediate bin of the sleeve lime kiln in the feeding process is reduced from 90 seconds to 40 seconds so as to reduce air entering the sleeve lime kiln in the feeding process.
7. The method of claim 1, wherein the reducing air entering the sleeve lime kiln during the loading further comprises:
and stopping rotating the sleeve lime kiln rotary distributor in the process of waiting for loading, pressing and sealing, and increasing the pressing time of a material cup from 10 seconds to 120 seconds so as to reduce air entering the sleeve lime kiln in the loading process.
8. The method of claim 1, wherein mixing the fuel gas and the combustion air at a set air-fuel ratio comprises:
according to the following steps of 1:1.5, mixing fuel gas and combustion air, wherein the heat value of the fuel gas is controlled between 1700 and 1800Kkcal.
9. The method of claim 1, wherein controlling the temperature of the combustion gas during the combustion process comprises:
the low-nitrogen burner is adopted, so that flame generated by the gas in the combustion process is uniformly distributed, and the condition of overhigh temperature of the gas in the combustion process is avoided.
10. The method of claim 1, wherein the controlling the temperature of the combustion gas during the combustion process further comprises:
and a PLC control mode based on input heat is adopted, based on the heat required by decomposing limestone, the heat value of the fuel gas, the heat consumption and the output required by the product are obtained through an online heat value instrument, and the fuel gas supply quantity and the secondary air quantity of a combustion chamber in the sleeve lime kiln are regulated and controlled.
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