CN113578023B - Method and device for treating nitrogen oxides in boiler waste gas by using dimethylamine waste liquid - Google Patents
Method and device for treating nitrogen oxides in boiler waste gas by using dimethylamine waste liquid Download PDFInfo
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- CN113578023B CN113578023B CN202110884552.3A CN202110884552A CN113578023B CN 113578023 B CN113578023 B CN 113578023B CN 202110884552 A CN202110884552 A CN 202110884552A CN 113578023 B CN113578023 B CN 113578023B
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
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Abstract
The invention discloses a method and a device for treating nitrogen oxides in boiler waste gas by using dimethylamine waste liquid. The method comprises the steps of introducing dimethylamine and/or dimethylamine waste liquid into a boiler hearth, and enabling the dimethylamine to react with nitrogen oxide generated by fuel combustion to generate nitrogen and water under a certain temperature condition, so that the concentration of the nitrogen oxide in boiler flue gas is reduced. The device comprises a dimethylamine waste liquid storage and conveying unit, a compressed air unit, a combustion reaction unit and a smoke detection unit. The method and the device can be used for treating the nitrogen oxide in the boiler flue gas by using the dimethylamine waste liquid, can solve the problem that the dimethylamine waste liquid is difficult to treat, is also suitable for the conditions of low boiler load at night and low temperature in a hearth, can reduce the concentration of the nitrogen oxide in the boiler flue gas to be below the emission standard, can also solve the problem of increased ammonia emission caused by excessive spraying of ammonia water, and achieves the purpose of treating waste by waste.
Description
Technical Field
The invention relates to a purification treatment technology of industrial waste gas, in particular to a method and a device for treating nitrogen oxides in boiler waste gas by using dimethylamine waste liquid.
Background
At present, most of domestic synthetic leather manufacturers firstly recover the solvent in the wastewater, then adopt a biochemical method to treat the wastewater, and discharge the wastewater when each index reaches the national emission standard. The solvent recovery mainly adopts a rectification method, the solvent Dimethylformamide (DMF) in the synthetic leather production can be recovered, and the method has higher practicability and economic benefit. However, in the recovery of DMF by distillation, DMF reacts with water when heated to 100 ℃ to form dimethylamine and formic acid, and DMF is also decomposed at high temperature to form dimethylamine and carbon monoxide. Dimethylamine, although less toxic, has a low boiling point, is volatile, is easily soluble in water, has a strong malodorous smell, can cause unpleasant feelings, and is not good for human health. At present, domestic synthetic leather enterprises basically do not manage to directly discharge into the atmosphere, thereby causing environmental pollution.
The flue gas generated by the boiler of cogeneration in industrial parks contains certain concentration of Nitrogen Oxides (NO)X) And the waste water is treated to reach the standard and be discharged. In the prior art, ammonia water or urea is generally sprayed into a boiler to react ammonia or ammonia-containing substances with nitrogen oxides to generate nitrogen and water, so that the concentration of the nitrogen oxides in flue gas is reduced. However, the day and night heat load difference is close to 50%, the load of the boiler is basically below 50% of the maximum continuous evaporation capacity at night, so that the temperature of the ammonia injection water denitration part is reduced to 600-800 ℃ or lower, the temperature is lower than the optimum denitration condition of the ammonia water, the denitration efficiency is reduced, and the Nitrogen Oxide (NO) is definitely required for achieving the coal-electricity energy-saving emission-reduction upgrading and reconstruction action plan (2014-2020)X) The discharge concentration is not higher than 50mg/m3The requirement that the flue gas NO can be filled by the ammonia water excessive spraying modeXEmissions are satisfactory, but result in increased ammonia slip.
Therefore, it is necessary to develop an effective method for treating dimethylamine waste solution and find a denitration reducing agent when the flue gas temperature is lower than 800 ℃. It is necessary to develop a method and an apparatus for treating nitrogen oxides in boiler exhaust gas by using dimethylamine waste liquid.
Disclosure of Invention
The invention aims to provide a method and a device for treating nitrogen oxide in boiler waste gas by using dimethylamine waste liquid, wherein the method and the device use the dimethylamine waste liquid to replace ammonia water in the prior art for treating the nitrogen oxide in the boiler waste gas, not only can solve the problem that the dimethylamine waste liquid is difficult to treat, but also can achieve the characteristic of higher denitration efficiency at lower temperature by using dimethylamine under the conditions of lower boiler load and low temperature in a hearth at night, so that the concentration of the nitrogen oxide in the boiler waste gas is reduced below the emission standard, and the problem of increased ammonia escape caused by excessive spraying of the ammonia water can be solved, thereby achieving the purpose of treating waste by waste.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for treating nitrogen oxides in boiler exhaust gas by using dimethylamine waste liquor, comprising the following steps:
dimethylamine and/or dimethylamine waste liquid are introduced into a boiler furnace, so that the dimethylamine reacts with nitrogen oxides generated by fuel combustion to generate nitrogen and water under a certain temperature condition, and the concentration of the nitrogen oxides in boiler flue gas is reduced.
Preferably, the method comprises the steps of:
step 1) detecting the concentration of the dimethylamine waste liquid, and adjusting the concentration of the dimethylamine waste liquid to a certain range;
step 2) atomizing the dimethylamine waste liquid obtained in the step 1) by using compressed air, and then spraying the atomized dimethylamine waste liquid into a boiler hearth, so that dimethylamine is fully atomized and then mixed with high-temperature flue gas for combustion and decomposition;
and 3) detecting the concentration of nitrogen oxide in the boiler exhaust gas, and adjusting the amount of the dimethylamine waste liquid sprayed into the boiler furnace.
Preferably, the mass percentage concentration of the dimethylamine waste liquid is 3-10%.
Preferably, the certain temperature condition comprises a temperature of 400-950 ℃.
Preferably, the dimethylamine comprises a mixed gas containing gaseous dimethylamine, and the mixed gas containing gaseous dimethylamine comprises gas overflowing from a dimethylamine waste liquor storage tank.
Preferably, the position of the dimethylamine waste liquid sprayed into the boiler furnace is a flue between a boiler combustion chamber and a furnace outlet and a separator, and the number of the nozzles for spraying the dimethylamine waste liquid into the boiler furnace is 2-8.
Preferably, the pressure of the compressed air is 0.5-0.8 kPa.
In a second aspect, the invention provides a device for treating nitrogen oxides in boiler exhaust gas by using dimethylamine waste liquid, which comprises a dimethylamine waste liquid storage and conveying unit, a compressed air unit, a combustion reaction unit and a flue gas detection unit; the dimethylamine waste liquid storage and conveying unit is connected with the compressed air unit and then connected with the combustion reaction unit, and the combustion reaction unit is connected with the smoke detection unit.
Preferably, the dimethylamine waste liquid storage and delivery unit comprises a dimethylamine storage tank, a dimethylamine mother pipe, a dimethylamine pump, a pressurized dimethylamine mother pipe, a dimethylamine distribution box and a first methylamine nozzle; the compressed air unit comprises an air compressor, a compressed air main pipe, a compressed air distribution box and a first compressed air blowing assisting pipe; the combustion reaction unit comprises a first boiler furnace; the smoke detection unit comprises a smoke detection station; the dimethylamine storage tank is connected with a liquid inlet of the dimethylamine pump through the dimethylamine mother pipe, a liquid outlet of the dimethylamine pump is connected with the dimethylamine distribution box through the dimethylamine mother pipe after the pressure is increased, the dimethylamine distribution box is connected with the first methylamine spray pipe, and the first methylamine spray pipe is introduced into the first boiler hearth; a gas outlet of the air compressor is connected with the compressed air distribution box through the compressed air main pipe, the compressed air distribution box is connected with the first compressed air blowing-assisting pipe, and the first compressed air blowing-assisting pipe is connected with the first methylamine nozzle; and the smoke detection station is connected with a gas outlet of the first boiler hearth.
Preferably, the device further comprises a dimethylamine deodorization unit; the dimethylamine deodorization unit comprises an exhaust pipeline and a primary fan; the primary air fan is connected with the top of the dimethylamine storage tank through an exhaust pipeline.
Compared with the prior art, the invention has the following beneficial effects: (1) the method has the advantages that the dimethylamine waste liquid is used for replacing ammonia water or urea for denitration, optimization and transformation can be performed on the basis of partial equipment of the original SNCR denitration process, the process is simple, the operation difficulty is small, the purchase cost of the ammonia water can be saved, the treatment cost of the dimethylamine waste water can be reduced, and the economic benefit is good; (2) the method can reduce the concentration of nitrogen oxides in boiler flue gas to be below the emission standard by utilizing the characteristic that dimethylamine can reach higher denitration efficiency at lower temperature under the conditions of lower boiler load and low temperature in a hearth at night and adopting double prevention control strategies of nitrogen oxide removal efficiency and ammonia escape rate, and can solve the problem of increased ammonia escape caused by excessive spraying of ammonia water, so that the ammonia emission concentration is not higher than 2.28mg/m3So as to achieve the purpose of treating wastes with wastes; (3) can also eliminate the malodor of dimethylamine and reduce the air pollution. Can be popularized and applied in a large scale in a synthetic leather industrial park, and has important benefits for the development of economy, society and environment in China.
Drawings
FIG. 1 is a schematic view of an apparatus for treating nitrogen oxides in boiler exhaust gas using dimethylamine waste liquid according to the present invention;
FIG. 2 is a schematic view of an embodiment of the apparatus for treating nitrogen oxides in boiler exhaust gas using dimethylamine waste liquor according to the present invention;
wherein:
1. dimethylamine holding vessel, 11, the female pipe of dimethylamine, 12, the exhaust duct, 2, the dimethylamine pump, 21, the female pipe of dimethylamine after the lifting pressure, 3, air compressor, 31, the female pipe of compressed air, 4, the primary air fan, 5, dimethylamine distributor box, 51, first two methylamine spray tube, 52, second dimethylamine spray tube, 6, compressed air distributor box, 61, first compressed air helps the blowpipe, 62, second compressed air helps the blowpipe, 7, first boiler furnace, 8, second boiler furnace, 9, flue gas check out test station.
Detailed Description
The invention provides a method for treating nitrogen in boiler waste gas by using dimethylamine waste liquidThe method and the device of the oxide use the dimethylamine waste liquid to replace ammonia water in the prior art for treating the nitrogen oxide in the boiler flue gas, not only can solve the difficult problem that the dimethylamine waste liquid is difficult to treat, but also can reduce the concentration of the nitrogen oxide in the boiler flue gas to 50mg/m of emission standard by utilizing the characteristic that the dimethylamine can reach higher denitration efficiency at lower temperature under the conditions of lower boiler load and low temperature in a hearth at night3The problem of increased ammonia escape caused by excessive spraying of ammonia water can be solved, and the purpose of treating wastes with wastes is achieved.
The invention provides a method for treating nitrogen oxides in boiler waste gas by using dimethylamine waste liquid, which comprises the following steps:
dimethylamine and/or dimethylamine waste liquid are introduced into a boiler furnace, so that the dimethylamine reacts with nitrogen oxides generated by fuel combustion to generate nitrogen and water under a certain temperature condition, and the concentration of the nitrogen oxides in boiler flue gas is reduced.
Preferably, the method comprises the steps of:
step 1) detecting the concentration of the dimethylamine waste liquid, and adjusting the concentration of the dimethylamine waste liquid to a certain range;
step 2) atomizing the dimethylamine waste liquid obtained in the step 1) by using compressed air, and then spraying the atomized dimethylamine waste liquid into a boiler hearth, so that dimethylamine is fully atomized and then mixed with high-temperature flue gas for combustion and decomposition;
and 3) detecting the concentration of nitrogen oxide in the boiler exhaust gas, and adjusting the amount of the dimethylamine waste liquid sprayed into the boiler furnace.
The bond energy of the N-H chemical bond in ammonia is 351kJ/mol, the bond energy of the C-N chemical bond in dimethylamine is 284kJ/mol, the larger the bond energy is, the lower the self energy is, and the smaller the bond energy is, the higher the self energy is. When the material is used as a reactant, the material with high bond energy needs to absorb higher energy to be activated to participate in chemical reaction; substances with small bond energy can participate in the reaction by absorbing lower energy. Dimethylamine is subjected to thermal cracking at 420-440 ℃ to generate methylamine, methane, hydrogen and the like. Therefore, the inventor conjectures that dimethylamine is more likely to react as a denitration reducing agent, and researches and tests show that after dimethylamine is thermally decomposed, the denitration efficiency of a pyrolysis product participating in the reaction has a bimodal characteristic, the first peak value is about 450-700 ℃, the denitration efficiency is highest, and the second peak value is 850-950 ℃. And the denitration reducing agent spraying area temperature corresponding to the difference between day and night of the heat supply load of most of the parks corresponds to two peak values exactly.
Preferably, the mass percentage concentration of the dimethylamine waste liquid is 3-10%.
The inventor finds that the concentration of dimethylamine is not only limited by a delivery pump and a designed delivery pipeline, but also influences the heat exchange effect and the exhaust gas temperature of the heated surface (a superheater, an economizer, an air preheater and a low-temperature economizer) at the tail part of the boiler, and the efficiency and the denitration effect of the boiler are ensured to the maximum extent through research.
Preferably, characterization and analysis are carried out through site boiler outlet flue gas nitrogen oxide emission data and ammonia escape, and then according to site distance and height, pressure parameters of a dimethylamine delivery pump and a pipeline are selected and determined, wherein the delivery pressure of dimethylamine is 0.6-2.5 MPa.
Preferably, the certain temperature condition comprises a temperature of 400-950 ℃.
Further preferably, the certain temperature condition includes a temperature of 400 ℃ or higher, and any temperature or any temperature range within a range of 950 ℃ or lower.
Further preferably, the temperature conditions include a temperature of 400 deg.C, 450 deg.C, 500 deg.C, 550 deg.C, 600 deg.C, 650 deg.C, 700 deg.C, 800 deg.C, 850 deg.C, 900 deg.C, 950 deg.C.
Preferably, the dimethylamine comprises a gaseous dimethylamine-containing mixed gas, and the gaseous dimethylamine-containing mixed gas comprises gas overflowing from a dimethylamine waste liquid storage tank.
Further preferably, in order to eliminate the odor overflowing from the dimethylamine storage tank 1, the gas discharged by the dimethylamine waste liquid is conveyed to a boiler furnace by a negative pressure technology for combustion, so as to participate in the denitration reaction, so that the odor of dimethylamine is eliminated, and simultaneously, the gaseous dimethylamine is utilized, and the environment pollution caused by the emission of the gaseous dimethylamine to the air is avoided.
Further preferably, the negative pressure range of the deodorizing action is-100 to-300 Pa.
Preferably, the position of the dimethylamine waste liquid sprayed into the boiler furnace is a flue between a boiler combustion chamber and a furnace outlet and the separator, and the number of the nozzles for spraying the dimethylamine waste liquid into the boiler furnace is 2-8.
Further preferably, the position of the dimethylamine injection point and the number of spray guns are determined by analyzing the sectional area of the system, the temperature distribution of flue gas and the load condition of the normal operation working condition of the boiler.
Further preferably, the form of the spray gun nozzle is selected according to the cross section of the injection point, the influence of the form of the spray gun nozzle and the atomization angle on the mixing effect of the dimethylamine waste liquid and the flue gas. The spray gun head is in the form of a fan nozzle, and further preferably the fan nozzle comprises a high flow, high temperature, and erosion resistant fan nozzle.
Preferably, the pressure of the compressed air is 0.5kPa to 0.8 kPa.
Further preferably, the method adopts a double prevention control means, not only the nitrogen oxide emission data is adjusted and controlled, but also the ammonia escape rate parameter is adjusted in an auxiliary manner, and the parameters such as the concentration of the dimethylamine waste liquid, the number of the injection guns, the frequency of the dimethylamine delivery pump, the pressure of compressed air and the like are adjusted, so that the phenomena of insufficient denitration and excessive injection of the dimethylamine waste liquid are prevented, the emission of waste gas is reduced, and the atmospheric pollution is reduced.
The inventor finds that in practical application, the concentration of dimethylamine is greatly changed, the components are complex, and the content of each gas generated by thermal decomposition at different temperatures is different when the dimethylamine is sprayed into a boiler for combustion. The temperature field of the boiler hearth is changed by the change of the burning coal type, the load working condition and the air-coal ratio. Therefore, the inventor proposes to determine the nitrogen content of the burning coal and the concentration of the dimethylamine waste liquid, and then detects the smoke emission after the dimethylamine waste liquid is denitrated under various load working conditions by adopting a detection instrument, so that the dimethylamine combustion product can be more accurately identified.
Through the concentration of the detected dimethylamine waste liquid and the nitrogen content of the burning coal, the required dimethylamine waste liquid conveying amount is calculated according to simulation, and the frequency converter of the dimethylamine conveying pump is adjusted. By detecting whether the content of nitrogen oxide in the boiler gas emission is 50mg/m3Following, thenFeeding back the rising amount or the falling amount of the nitrogen oxide content of the boiler gas emission to a dimethylamine pump frequency adjustment value; meanwhile, the frequency adjustment additional adjustment quantity is fed back to the dimethylamine pump through ammonia escape change, and the injection quantity of dimethylamine reaches an optimal value through multiple analysis and adjustment, so that an effective theoretical basis is provided for a control strategy of adopting nitrogen oxide and ammonia escape rate.
The invention relates to a control idea of a method for treating nitrogen oxides in boiler waste gas by using dimethylamine waste liquid, which comprises the following steps: setting a target value of the content of nitrogen oxides in flue gas according to the concentration of the dimethylamine waste liquid and the nitrogen content of combustion coal, calculating the conveying capacity of the dimethylamine waste liquid, detecting the actual content of nitrogen oxides in the flue gas by using a flue gas detector, comparing the actual content of nitrogen oxides in the flue gas with the set value, determining whether the content of the flue gas meets the standard or not according to the comparison result, judging that the denitration reaction is finished if the content of the flue gas meets the standard, and putting a second group of dimethylamine spray guns if the content of nitrogen oxides does not meet the standard; and when the four groups of spray guns are all put into the device, adjusting the frequency of a dimethylamine delivery pump according to the comparison result, and further increasing the injection amount of the dimethylamine waste liquid.
The invention provides a device for treating nitrogen oxides in boiler waste gas by using dimethylamine waste liquid, which comprises a dimethylamine waste liquid storage and conveying unit, a compressed air unit, a combustion reaction unit and a flue gas detection unit, wherein the dimethylamine waste liquid storage and conveying unit is connected with the combustion reaction unit; the dimethylamine waste liquid storage and conveying unit is connected with the compressed air unit and then connected with the combustion reaction unit, and the combustion reaction unit is connected with the smoke detection unit.
Preferably, as shown in fig. 1, the dimethylamine waste solution storage and delivery unit comprises a dimethylamine storage tank 1, a dimethylamine mother pipe 11, a dimethylamine pump 2, a pressure-raised dimethylamine mother pipe 21, a dimethylamine distribution box 5 and a first methylamine nozzle 51; the compressed air unit comprises an air compressor 3, a compressed air main pipe 31, a compressed air distribution box 6 and a first compressed air blow-assisting pipe 61; the combustion reaction unit comprises a first boiler furnace 7; the smoke detection unit comprises a smoke detection station 9; the dimethylamine storage tank 1 is connected with a liquid inlet of a dimethylamine pump 2 through a dimethylamine mother pipe 11, a liquid outlet of the dimethylamine pump 2 is connected with a dimethylamine distribution box 5 through a dimethylamine mother pipe 21 with the pressure increased, the dimethylamine distribution box 5 is connected with a first methylamine nozzle 51, and the first methylamine nozzle 51 is introduced into a first boiler hearth 7; the gas outlet of the air compressor 3 is connected with a compressed air distribution box 6 through a compressed air main pipe 31, the compressed air distribution box 6 is connected with a first compressed air blowing assisting pipe 61, and the first compressed air blowing assisting pipe 61 is connected with a first methylamine nozzle 51; the flue gas detection station 9 is connected with a gas outlet of the first boiler furnace 7.
Preferably, as shown in fig. 2, the device further comprises a dimethylamine deodorization unit; the dimethylamine deodorization unit comprises an exhaust pipeline 12 and a primary fan 4; the primary air blower 4 is connected to the top of the dimethylamine storage tank 1 through an exhaust pipe 12.
An example of the operation of the apparatus for treating nitrogen oxides in boiler exhaust gas by using dimethylamine waste liquid (as shown in fig. 2) of the present invention is as follows: detecting that the concentration of the dimethylamine waste liquid is in a specified range (3-10%), and allowing the dimethylamine waste liquid to be injected into a dimethylamine storage tank through a dimethylamine unloading pump; opening an exhaust pipeline 12 of a dimethylamine storage tank, adjusting the pressure of a deodorization pipeline to be-100-300 Pa, and sucking the odor of the dimethylamine storage tank into a boiler hearth through negative pressure for combustion; starting the dimethylamine delivery pump 2, opening an outlet electric door of the dimethylamine delivery pump to deliver the dimethylamine waste liquid to a dimethylamine waste liquid distribution box; starting the air compressor 3, opening an outlet electric door thereof, and conveying the compressed air subjected to primary dewatering to a compressed air distribution box; adjusting the frequency of the air compressor through a frequency converter, and controlling the pressure of the compressed air to be 0.5 kPa; respectively opening a first group of dimethylamine waste liquid spray gun adjusting doors, opening a compressed air blowing-assisted valve to spray dimethylamine waste liquid into a first boiler hearth 7 and a second boiler hearth 8, and mixing, burning and decomposing the dimethylamine waste liquid and high-temperature flue gas after the dimethylamine waste liquid is fully atomized; and adjusting and controlling the frequency of the dimethylamine delivery pump according to the emission of nitrogen oxides in the flue gas of the boiler.
The device of the invention executes the double prevention control technical thought as follows: detecting flue gas NO according to flue gas detectorXIf the emission data meet the preset numerical value, the third group and the fourth group of dimethylamine spray guns are thrown again until the smoke emission data meet the standard; on the contrary, when the smoke emission data is lower than the preset data and the ammonia escape is detected to be increased, the frequency of the frequency converter of the diamine pump is automatically fed back and adjusted to be smallWhen the ammonia escape value returns to normal (generally controlled at 2.28 mg/m)3) The dimethylamine pump frequency is stable in the working condition. When the dimethylamine pump frequency is reduced to the lowest allowable frequency of 15Hz, the dimethylamine spray guns are automatically withdrawn. Further, the method compares the actually detected content of the nitrogen oxide in the flue gas with the preset content of the nitrogen oxide in the flue gas to determine whether the denitration reaction is finished, compares the content difference of the nitrogen oxide in the flue gas with the preset content difference of the nitrogen oxide in the flue gas, and determines that the amount of the injected dimethylamine is accurate according to the comparison result, so that the denitration efficiency is improved, and the excessive injection of the waste dimethylamine liquid is prevented.
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The method for treating nitrogen oxides in boiler waste gas by using dimethylamine waste liquid by using the device shown in the attached drawing 1 comprises the following steps:
step 1), detecting the concentration of the dimethylamine waste liquid in a dimethylamine storage tank 1, and adjusting the concentration of the dimethylamine waste liquid to 3%;
step 2) starting a dimethylamine pump 2, so that compressed air generated by a dimethylamine waste liquid using an air compressor 3 enters a compressed air distribution box 6 through a compressed air main pipe 31, and is atomized by 0.8kPa compressed air of a first compressed air blowing assisting pipe 61 and then sprayed into a first boiler furnace 7, wherein the spraying positions are a boiler combustion chamber, a furnace outlet and a separator inlet flue, the number of nozzles is 8, and a spray gun nozzle is in a fan-shaped nozzle form, so that dimethylamine is fully atomized and then mixed with high-temperature flue gas for combustion and decomposition;
and 3) detecting the concentration of nitrogen oxide in the boiler exhaust gas, and adjusting the amount of the dimethylamine waste liquid sprayed into the boiler furnace.
The generated smoke is detected by a smoke detection station 9, and the concentration of nitrogen oxides is 48mg/m3The concentration of escaped ammonia is 1.98mg/m3And the ammonia water or the urea can be completely replaced by the dimethylamine waste liquid.
Example 2
The method for treating nitrogen oxides in boiler waste gas by using dimethylamine waste liquid by using the device shown in the attached figure 2 comprises the following steps:
step 1): detecting the concentration of the dimethylamine waste liquid, adjusting the concentration to 10 percent, and allowing the dimethylamine waste liquid to be injected into a dimethylamine storage tank 1;
opening a dimethylamine tank exhaust pipeline 12, adjusting the pressure of a deodorization pipeline to-300 Pa, and sucking the odor of a dimethylamine storage tank 1 into a boiler hearth through negative pressure for combustion;
step 2): starting the dimethylamine delivery pump 2, opening an outlet electric door of the dimethylamine delivery pump to deliver the dimethylamine waste liquor to a dimethylamine waste liquor distribution box 5, wherein the delivery pressure of dimethylamine is 2.5 MPa;
starting the air compressor 3, opening an outlet electric door thereof, and conveying the compressed air subjected to primary dewatering to a compressed air distribution box 6;
adjusting the frequency of the air compressor through a frequency converter, and controlling the pressure of the compressed air to be 0.5 kPa;
respectively opening a first group of dimethylamine waste liquid spray gun adjusting doors, opening a compressed air blowing-assisted valve to spray dimethylamine waste liquid into a first boiler hearth 7 and a second boiler hearth 8, wherein the boilers are in a daytime running state, the temperature of the spraying position of the dimethylamine is about 880-950 ℃, and the dimethylamine is fully atomized and then mixed with high-temperature flue gas for combustion and decomposition;
the dimethylamine waste liquid spraying position is a flue between a boiler hearth flue gas outlet and a separator, the number of the nozzles is 2, and the spray gun spray head is a high-flow, high-temperature-resistant and scouring-resistant fan-shaped spray nozzle;
and adjusting and controlling the frequency of the dimethylamine delivery pump according to the emission of nitrogen oxides in the flue gas of the boiler.
The generated smoke is detected by a smoke detection station 9, and the concentration of nitrogen oxides is 46mg/m3The concentration of escaped ammonia was 2.13mg/m3And the ammonia water or the urea can be completely replaced by the dimethylamine waste liquid.
Example 3
The method for treating nitrogen oxides in boiler waste gas by using dimethylamine waste liquid by using the device shown in the attached figure 2 comprises the following steps:
step 1): detecting the concentration of the dimethylamine waste liquid, adjusting the concentration to 6 percent, and allowing the dimethylamine waste liquid to be injected into a dimethylamine storage tank 1;
opening a dimethylamine storage tank exhaust pipeline 12, adjusting the pressure of a deodorization pipeline to-100 Pa, and sucking the odor of a dimethylamine storage tank 1 into a boiler hearth through negative pressure for combustion;
step 2): starting the dimethylamine delivery pump 2, opening an outlet electric door of the dimethylamine delivery pump to deliver the dimethylamine waste liquor to a dimethylamine waste liquor distribution box 5, wherein the delivery pressure of dimethylamine is 0.6 MPa;
starting the air compressor 3, opening an outlet electric door thereof, and conveying the compressed air subjected to primary water removal to a compressed air distribution box 6;
adjusting the frequency of the air compressor through a frequency converter, and controlling the pressure of the compressed air to be 0.65 kPa;
respectively opening a first group of dimethylamine waste liquid spray gun adjusting doors, opening a compressed air blowing-assisted valve to spray dimethylamine waste liquid into a first boiler hearth 7 and a second boiler hearth 8, wherein the boilers are in a night running state, the temperature of the spraying position of dimethylamine is about 460-510 ℃, and dimethylamine is fully atomized and then mixed with high-temperature flue gas for combustion and decomposition;
the dimethylamine waste liquid spraying position is a flue between a boiler hearth flue gas outlet and a separator, the number of the nozzles is 5, and the spray gun spray head is in a high-flow, high-temperature-resistant and scouring-resistant fan-shaped nozzle form; and adjusting and controlling the frequency of the dimethylamine delivery pump according to the emission of nitrogen oxides in the flue gas of the boiler.
The generated smoke is detected by a smoke detection station 9, and the concentration of nitrogen oxides is 39mg/m3The concentration of escaped ammonia was 1.66mg/m3And the ammonia water or the urea can be completely replaced by the dimethylamine waste liquid.
Example 4
The method for treating nitrogen oxides in boiler waste gas by using dimethylamine waste liquid by using the device shown in the attached figure 2 comprises the following steps:
step 1): detecting the concentration of the dimethylamine waste liquid, adjusting the concentration to 5 percent, and allowing the dimethylamine waste liquid to be injected into a dimethylamine storage tank 1;
opening a dimethylamine storage tank exhaust pipeline 12, adjusting the pressure of a deodorization pipeline to-200 Pa, and sucking the odor of the dimethylamine storage tank 1 into a boiler hearth through negative pressure for combustion;
step 2): starting the dimethylamine delivery pump 2, opening an outlet electric door of the dimethylamine delivery pump to deliver the dimethylamine waste liquor to a dimethylamine waste liquor distribution box 5, wherein the delivery pressure of dimethylamine is 1.6 MPa;
starting the air compressor 3, opening an outlet electric door thereof, and conveying the compressed air subjected to primary dewatering to a compressed air distribution box 6;
adjusting the frequency of the air compressor through a frequency converter, and controlling the pressure of the compressed air to be 0.65 kPa;
respectively opening a first group of dimethylamine waste liquid spray gun adjusting doors, opening a compressed air blowing-assisted valve to spray dimethylamine waste liquid into a first boiler hearth 7 and a second boiler hearth 8, wherein the boilers are in a day and night boundary operation state, and the temperature of the spraying position of dimethylamine is about 680-950 ℃, so that dimethylamine is fully atomized and then is mixed with high-temperature flue gas for combustion and decomposition;
the dimethylamine waste liquid is sprayed into the boiler combustion chamber and the hearth smoke outlet to the inlet flue of the separator, the number of the nozzles is 6, and the spray gun spray head is a high-flow, high-temperature-resistant and scouring-resistant fan-shaped spray nozzle;
and adjusting and controlling the frequency of the dimethylamine delivery pump according to the emission of nitrogen oxides in the flue gas of the boiler.
The generated smoke is detected by a smoke detection station 9, and the concentration of nitrogen oxides is 43mg/m3The concentration of escaped ammonia was 1.77mg/m3And the ammonia water or the urea can be completely replaced by the dimethylamine waste liquid.
The applicant states that the method and the device of the present invention are described by the above embodiments, but the present invention is not limited to the above embodiments, i.e. it does not mean that the present invention must be implemented by the above embodiments. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
Claims (4)
1. A method for treating nitrogen oxides in boiler exhaust gas by using dimethylamine waste liquid is characterized in that dimethylamine and/or the dimethylamine waste liquid is introduced into a boiler hearth, so that the dimethylamine reacts with the nitrogen oxides generated by fuel combustion to generate nitrogen and water under a certain temperature condition, and the concentration of the nitrogen oxides in boiler flue gas is reduced, and the method comprises the following steps:
step 1) detecting the concentration of the dimethylamine waste liquid, and adjusting the concentration of the dimethylamine waste liquid to a certain range; the mass percentage concentration of the dimethylamine waste liquid is 3-10%;
step 2) atomizing the dimethylamine waste liquid obtained in the step 1) by using compressed air, and then spraying the atomized dimethylamine waste liquid into a boiler hearth, so that dimethylamine is fully atomized and then mixed with high-temperature flue gas for combustion and decomposition; the position of the dimethylamine waste liquid sprayed into the boiler furnace is a flue between a boiler combustion chamber and a furnace outlet to the separator, and the number of the nozzles for spraying the dimethylamine waste liquid into the boiler furnace is 2-8; the pressure of the compressed air is 0.5-0.8 kPa;
step 3) detecting the concentration of nitrogen oxides in the flue gas discharged by the boiler, and adjusting the amount of the dimethylamine waste liquid sprayed into a hearth of the boiler;
the certain temperature condition comprises that the temperature is more than or equal to 400 ℃ and less than 950 ℃.
2. The method of claim 1, wherein the dimethylamine comprises a gaseous dimethylamine-containing gas mixture, and wherein the gaseous dimethylamine-containing gas mixture comprises a gas overflow from a dimethylamine waste reservoir.
3. The method for treating nitrogen oxides in boiler exhaust gas by using dimethylamine waste liquor according to claim 1, wherein an apparatus for implementing the method comprises a dimethylamine waste liquor storage and conveying unit, a compressed air unit, a combustion reaction unit and a flue gas detection unit;
the dimethylamine waste liquid storage and conveying unit is connected with the compressed air unit and then connected with the combustion reaction unit, and the combustion reaction unit is connected with the smoke detection unit;
the dimethylamine waste liquid storage and delivery unit comprises a dimethylamine storage tank (1), a dimethylamine mother pipe (11), a dimethylamine pump (2), the dimethylamine mother pipe (21) with the pressure increased, a dimethylamine distribution box (5) and a first methylamine spray pipe (51);
the compressed air unit comprises an air compressor (3), a compressed air main pipe (31), a compressed air distribution box (6) and a first compressed air blowing assisting pipe (61);
the combustion reaction unit comprises a first boiler furnace (7);
the smoke detection unit comprises a smoke detection station (9);
the dimethylamine storage tank (1) is connected with a liquid inlet of the dimethylamine pump (2) through the dimethylamine mother pipe (11), a liquid outlet of the dimethylamine pump (2) is connected with the dimethylamine distribution box (5) through the dimethylamine mother pipe (21) after the pressure is raised, the dimethylamine distribution box (5) is connected with the first methylamine nozzle (51), and the first methylamine nozzle (51) is introduced into the first boiler furnace (7);
a gas outlet of the air compressor (3) is connected with the compressed air distribution box (6) through the compressed air main pipe (31), the compressed air distribution box (6) is connected with the first compressed air blowing assisting pipe (61), and the first compressed air blowing assisting pipe (61) is connected with the first methylamine spraying pipe (51);
the flue gas detection station (9) is connected with a gas outlet of the first boiler furnace (7);
the operation process is as follows: detecting that the concentration of the dimethylamine waste liquid is in a specified range of 3-10%, and allowing the dimethylamine waste liquid to be injected into a dimethylamine storage tank through a dimethylamine unloading pump; opening an exhaust pipeline of a dimethylamine storage tank, adjusting the pressure of a deodorization pipeline to be-100-300 Pa, and sucking the odor of the dimethylamine storage tank into a boiler hearth through negative pressure for combustion; starting a dimethylamine delivery pump, opening an outlet electric door of the dimethylamine delivery pump, and delivering the dimethylamine waste liquor to a dimethylamine waste liquor distribution box; starting an air compressor, opening an outlet electric door of the air compressor, and conveying compressed air subjected to primary dewatering to a compressed air distribution box; adjusting the frequency of the air compressor through a frequency converter, and controlling the pressure of the compressed air to be 0.5 kPa; respectively opening a first group of dimethylamine waste liquid spray gun adjusting doors, opening a compressed air blowing-assisted valve to spray dimethylamine waste liquid into a first boiler furnace and a second boiler furnace, and mixing, burning and decomposing dimethylamine and high-temperature flue gas after the dimethylamine is fully atomized; adjusting and controlling the frequency of a dimethylamine delivery pump according to the emission of nitrogen oxides in the flue gas of the boiler;
the method comprises the steps of characterizing and analyzing emission data of nitrogen oxides in flue gas at an outlet of a boiler and ammonia escape on site, and selecting and determining pressure parameters of a dimethylamine delivery pump and a pipeline according to the site distance and height, wherein the delivery pressure of dimethylamine is 0.6-2.5 MPa.
4. The method of claim 3, wherein the apparatus further comprises a dimethylamine deodorization unit;
the dimethylamine deodorization unit comprises an exhaust pipeline (12) and a primary fan (4);
the primary air fan (4) is connected with the top of the dimethylamine storage tank (1) through an exhaust pipeline (12).
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