CN111375296A - Denitration ultralow-emission process system for waste gas generated in smelting of regenerated non-ferrous metal - Google Patents

Denitration ultralow-emission process system for waste gas generated in smelting of regenerated non-ferrous metal Download PDF

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CN111375296A
CN111375296A CN202010330215.5A CN202010330215A CN111375296A CN 111375296 A CN111375296 A CN 111375296A CN 202010330215 A CN202010330215 A CN 202010330215A CN 111375296 A CN111375296 A CN 111375296A
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sensor
module
denitration
control module
intermediate bin
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徐跃庭
潘恒华
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Jiangsu Juyibang Environmental Technology Co ltd
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • 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
    • B01D53/30—Controlling by gas-analysis apparatus
    • 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
    • B01D53/346—Controlling the process
    • 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
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/025—Other waste gases from metallurgy plants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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Abstract

The invention relates to a denitration ultralow emission process system for waste gas generated in smelting of regenerative nonferrous metal, which comprises a waste gas denitration device and an intelligent control unit, wherein the waste gas denitration device comprises a waste gas denitration device body and a denitration unit; the waste gas denitration device comprises a material suction machine, an intermediate bin, a vertical lift flue, a hearth and a chimney, wherein the upper part of the intermediate bin is connected with a positive pressure material conveying pipeline, the tail end of the positive pressure material conveying pipeline is connected with one end of a high-pressure air pump, and the other end of the high-pressure air pump is connected with a spray gun in the vertical lift flue and a spray gun in the furnace; the intelligent control unit comprises a sensor, a material level instrument, a feedback module, a central control computer and an operation and control module; the sensors are all in communication connection with an operation and control module, and the operation and control module is in communication connection with a central control computer through an Ethernet; the process system adopts modular intelligent management, and each target object of the flue gas is installed in the hearth to be transmittedSensor by detecting NO in the furnaceXThe denitration agent and NO are mixed by the processes of controlling the concentration, the feeding amount of the suction machine and the likeXAnd the aim of high-efficiency denitration is fulfilled.

Description

Denitration ultralow-emission process system for waste gas generated in smelting of regenerated non-ferrous metal
Technical Field
The invention relates to the field of atmosphere treatment of recycled metal smelting, in particular to a denitration ultralow emission process system for waste gas generated in recycled non-ferrous metal smelting.
Background
China is the worldIn the top-largest non-ferrous metal producing countries, the yields of 10 non-ferrous metals such as copper, aluminum, recycled metal, zinc and the like account for one third of the global yield. In the production process of nonferrous metals, a large amount of energy is consumed, and waste gas, waste water, solid waste and the like are generated. Under the large background of global non-ferrous metal mining restriction enhancement and low-carbon economic development, the recycling of the regenerated metal in China is promoted by means of technical progress, and the method is a necessary trend of industrial development. At present, the regeneration metal smelting process in China develops from the traditional fire smelting process of a reverberatory furnace, a blast furnace, a short rotary kiln and the like to the advanced process of introducing a foreign pre-desulfurization-low-temperature reduction smelting process and a rich-nutrient side-blown smelting furnace, and a large amount of NO is generated in the smelting processX. In the reduction stage in the furnace, nitrogen is oxidized to NO at high temperatureXThe concentration can reach 1500mg/m3And NO in one production cycleXThe concentration fluctuation is large. In the oxidation stage, the atomic N combined with hydrocarbon in the fuel is oxidized to generate fuel type NO in the combustion processX。NOXThe generation of (2) can cause a series of environmental problems such as acid rain, photochemical smog, haze and the like, and threatens human health and living environment of animals and plants.
To NO at presentXThe treatment method comprises ① Selective Catalytic Reduction (SCR), which is to react NO in flue gas at 300-400 deg.C with ammonia water or urea as reducing agent under the action of catalystXReduction to nitrogen and water, NOXThe removal rate of the NOx can reach more than 85 percent, but the technology has high operation cost and higher requirement on the activity of the catalyst ② SNCR adopts urea or ammonia water to remove NO in the hearth smoke under the condition that the temperature is 850-1100 ℃ and NO catalyst is usedXReduction to N2The technology is mature, equipment is simple, the denitration efficiency of the technology is about 40 percent, ③ SNCR + low-temperature reduction technology adopts two-stage denitration, one stage adopts an SNCR process, and the second stage adopts two washing towers connected in series, the denitration efficiency of the method can reach 75 percent, but the method has high steam content in flue gas, is easy to generate the problem of washing tower swelling, causes the unreacted hydrogen peroxide and urea solution to be discharged out of a system, and influences the denitration efficiency, ④ ozone oxidation reduction denitration adopts ozoneThe strong oxidizing property of the catalyst oxidizes NO into high-valence nitrogen oxide NxOx, then part of the high-valence nitrogen is absorbed by alkali liquor in a first-stage tower, and part of the high-valence nitrogen is reduced into nitrogen and water in a second-stage reduction tower under the action of a reducing agent, so that NOx is efficiently removed, and the denitration efficiency is realized along with O3When NO is 0.9, the denitration efficiency of 86.27% is achieved, but there is a problem of ozone escape.
The invention patent CN 104941430A discloses a flue gas denitration device and a flue gas denitration method, wherein an ozone spray oxidation reaction layer and a hydrogen peroxide spray oxidation reaction layer are both arranged in an absorption spraying area. This process achieves the removal of NOXThe purpose is that the ozone is in smoke temperature environment with temperature over 130 ℃ and the dust content is 50-200 mg/Nm3When the range is within the range, the decomposition and the adsorption of smoke substances are easy to generate, and the activity is lost; in addition there is a potential environmental risk of ozone escaping.
The invention patent CN 105107379A discloses an all-carbon flue gas denitration system and a denitration method, the method has high technical requirements, the proportion of oxygen and carbon monoxide in flue gas needs to be reasonably controlled, and if the proportion is maladjusted, the denitration effect is greatly reduced.
The invention patent CN 202666687U discloses a flue gas denitration device, which utilizes ammonia gas generated by thermal decomposition of ammonium bicarbonate as a reducing agent to realize denitration treatment of flue gas in a denitration tower filled with granular activated carbon. Although the technology can realize the purification of the flue gas, a larger activated carbon circulation amount is needed for ensuring higher denitration activity, so that the loss in the activated carbon circulation process is increased, the operation cost is increased, and the popularization is difficult.
The invention patent CN 110591786A discloses a denitration machine, which adopts PLC to control the denitration operation of raw materials, avoids the waste of raw materials, improves the product quality, simultaneously the denitration temperature can reach 500 ℃, further improves the efficiency, reduces the cost, enables partial waste materials to be continuously used through a filter pipe, avoids the waste of injection molding materials, and simultaneously adopts a novel control mode that a permanent magnet circular truncated cone is embedded at the bottom end, reduces the cost and prolongs the service life. This denitration machine is effectual to high temperature flue gas denitration, but the energy consumption is also high.
The invention patent CN 107952360 discloses an iron powder denitration process, which takes iron powder as a reducing agent of nitrogen oxide, so that the iron powder reacts with the nitrogen oxide in a flue, the oxidized iron powder generates iron oxide, and the iron oxide enters a subsequent dedusting procedure along with flue gas to be collected. The invention takes the iron powder as the reducing agent of the nitrogen oxide, has no ammonia escape problem, does not need an ammonia station or a urea storage tank, and reduces the potential safety hazard. However, this process produces a mixture of iron oxide powder and dust, which is a solid waste.
The invention patent CN 108939900A discloses a flue gas denitration process system, which is beneficial to improving and adjusting the blockage of a pipeline caused by dust precipitation and is easy to adjust the temperature, and the flue gas denitration system is kept in a stable working state for a long period, so that the consumption is reduced. Although the problem of pipe blockage caused by smoke dust is solved, the denitration system belongs to a tail end treatment technology.
In summary, most of research and application of denitration processes at the present stage are coal-fired power plant smoke and cement kiln smoke, and the denitration processes and devices in the smoke process of the regenerative metal smelting industry are reported. Stable working condition of coal-fired power plant, its NOXThe fluctuation of the generated quantity is small, and the requirement on the working condition is simple. In the case of secondary metal smelting, the furnace chamber NO is in one production cycleXThe variation is large and can be 300-1500 mg/m3Fluctuation exists, and the traditional method with unstable working conditions is difficult to realize ultralow emission.
Disclosure of Invention
In order to make up the defects of the prior art, the invention aims to provide a regenerated non-ferrous metal smelting waste gas denitration ultra-low emission process system which adopts modular intelligent management, is provided with target object sensors of flue gas in a hearth and detects NO in the hearthXConcentration, controlling the delivery quantity of the denitrifier in the device, and reasonably arranging spray guns in the hearth or the vertical flue to ensure that the denitrifier and NO are mixedXThe reaction achieves the aim of high-efficiency denitration, the process system is high-efficiency and intelligent, and NO is realizedXAnd (4) ultralow emission.
In order to achieve the purpose, the invention adopts the technical scheme that: a denitration ultralow-emission process system for regenerated metal smelting waste gas comprises a waste gas denitration device and an intelligent control unit; the waste gas denitration device comprises a material suction machine, an intermediate bin, a vertical flue, a hearth and a chimney, wherein the vertical flue is arranged above the hearth; the technical key points are as follows: the material suction machine is connected with an intermediate bin through a pipeline, the upper part of the intermediate bin is connected with a positive pressure material conveying pipeline, a stirrer and a pore plate are arranged in the intermediate bin, the stirrer is arranged at the lower part of the intermediate bin, and the pore plate is arranged at the upper part of the intermediate bin and below the positive pressure material conveying pipeline; the tail end of the positive pressure material conveying pipeline is connected with one end of a high-pressure air pump, a back-blowing electromagnetic valve is arranged between the positive pressure material conveying pipeline and the high-pressure air pump, the other end of the high-pressure air pump is connected with a direct-rising flue inner spray gun and an in-furnace spray gun, the direct-rising flue inner spray gun is arranged in the direct-rising flue, and the in-furnace spray gun is arranged in the hearth;
the intelligent control unit comprises 1#Sensor, 2#Sensor, 3#The device comprises a sensor, a material level instrument, a feedback module, a central control computer, an operation and control module, a cutting-off module I, a command execution module and a cutting-off module II;
1 is described#Sensor, 2#Sensor, 3#The sensors are in communication connection with the operation and control module, the operation and control module is in communication connection with the central control computer through Ethernet, the level meter is connected with the central control computer through the feedback module, and the operation and control module accurately controls the material suction amount of the material suction machine and the material feeding amount of the high-pressure air pump through the command execution module;
the material level meter is arranged in the intermediate bin and below the positive pressure material conveying pipeline and the orifice plate; 1 is described#The sensor is arranged in the positive pressure material conveying pipeline, is arranged between the back-blowing electromagnetic valve and the high-pressure air pump, and transmits the pressure and the flow speed in the pipeline to the operation and control module; 2 is described#The sensor is arranged in the hearth and used for measuring the temperature of the flue gas, the concentration of the original smoke dust, the flow rate of the flue gas and the original NO in the hearthXData such as concentration, oxygen content, CO instantaneous concentration and the like are transmitted to the operation and control module; said 3#The sensor is arranged at the discharge port above the chimney for detecting NO at the discharge portXThe concentration is transmitted to an operation and control module; the operation and control module analyzes the data and transmits the data to the central control computer through the Ethernet, and the material level meter measures the storage quantity of the materials in the intermediate bin and feeds back the signals to the central control computer through the feedback module.
The command execution module in the operation and control module controls the material suction amount of the material suction machine by starting or stopping material suction; if the data exceeds a set value and the control system fails, the cutting-off module I is started, and manual feeding is changed;
the calculation and control module analyzes 2#Sensor, 3#The sensor transmits data, controls the feeding amount of the high-pressure air pump through the command execution module, and controls the feeding amount according to the value 1#The pressure and the flow rate in the pipeline are corrected by the transmission data of the sensor, so that the denitration agent is uniformly, stably and smoothly conveyed to the port of the spray gun, and if the data exceeds a set value and the control system fails, the cutting-off module II is started, and manual feeding is changed.
Further, the stirrer is an anchor stirrer or a variable-frequency double-layer stirrer,
further, the pore plate is provided with a pore diameter of
Figure BDA0002463483260000041
Uniformly distributed holes with porosity of more than 80 percent and the material is 304 stainless steel.
Further, the spray guns in the vertical flue or the spray guns in the furnace are arranged in any one of parallel connection, series connection or series-parallel connection.
The invention has the following advantages:
(1) the invention adopts intelligent modular management according to NO in the hearth flue gasXConcentration, the total amount of denitration agent in the automatic adjustment gets into furnace, can avoid the waste of unnecessary denitration agent, realizes high-efficient denitration, reaches the requirement of ultralow emission.
(2) The invention has small floor area, all devices are connected through pipelines, the plane arrangement of the devices is flexible, and the invention is particularly suitable for reconstruction and expansion projects limited by sites.
(3) The invention can be simultaneously connected with a plurality of process systems in parallel according to the working condition requirement, and the feeding and the material feeding amount of each process system are controlled by the central control computer.
(4) The invention adopts the equipment of uniform material block breaking, denitration agent pore plate sieving, regular back flushing of the feeding pipeline and the like, effectively avoids the problem of blockage of the denitration agent in the pipeline, and is beneficial to the continuous and stable operation of the denitration system.
(5) The invention adopts intelligent control, has simple observation, monitoring and maintenance, less operators, quick start investment of the denitration device and good adaptability during load adjustment.
(6) The working conditions of the hearth and the pipeline are analyzed by the central control computer, and when the feeding, the pause and the cleaning are intelligently judged. The technology can ensure that the chimney does not have NOXThe discharge capacity reaches 25mg/m3Below the specific emission limit of 100mg/m in the emission Standard of regenerated copper, aluminum, lead and zinc Industrial pollutants3The requirement of (2) realizes ultra-low emission, and is also lower than the current local emission standards of the most strict Beijing, Hebei and the like in China.
Drawings
FIG. 1 is a schematic structural view of an exhaust gas denitration apparatus according to the present invention;
FIG. 2 is a block diagram of the intelligent control unit of the present invention;
FIG. 3 is 3#A map of sensor locations.
Specific names of the structures in fig. 1-3 are: material package 1, auto sucking machine 2, agitator 3, intermediate bin 4, material level appearance 5, orifice plate 6, malleation conveying pipeline 7, blowback solenoid valve 8, 1#Sensor 9, high-pressure air pump 10, furnace 11, 2# Sensor 12, in-furnace spray gun 13, vertical lifting flue 14, and vertical lifting flue inner spray guns 15, 3#The system comprises a sensor 16, a feedback module 17, a central control computer 18, an operation and control module 19, a cutting-off module I20, a command execution module 21, a cutting-off module II 22 and a chimney 23.
Detailed Description
Example 1
Referring to fig. 1 to 3, the specific structure of the present embodiment is: a denitration ultralow-emission process system for regenerated metal smelting waste gas comprises a waste gas denitration device and an intelligent control unit;
the waste gas denitration device comprises a material bag 1, a material suction machine 2, an intermediate bin 4, a vertical lift flue 14, a hearth 11 and a chimney 23, wherein the vertical lift flue 14 is arranged above the hearth 11; one end of the material sucking machine 2 is connected with the material bag 1, the other end of the material sucking machine is connected with the intermediate bin 4 through a pipeline, a positive pressure material conveying pipeline 7 is arranged at the upper part of the intermediate bin 4, a stirrer 3 and a pore plate 6 are arranged in the intermediate bin 4, the stirrer 3 is arranged at the lower part of the intermediate bin 4, and the pore plate 6 is arranged at the upper part of the intermediate bin 4 and below the positive pressure material conveying pipeline 7; the tail end of the positive pressure material conveying pipeline 7 is connected with one end of a high-pressure air pump 10, a back-blowing electromagnetic valve 8 is arranged between the positive pressure material conveying pipeline 7 and the high-pressure air pump 10, the other end of the high-pressure air pump 10 is connected with a vertical-lift flue inner spray gun 15 and a furnace inner spray gun 13, the vertical-lift flue inner spray gun 15 is arranged in a vertical-lift flue 14, and the furnace inner spray gun 13 is arranged in a hearth 11.
The stirrer 3 can be an anchor stirrer or a variable-frequency double-layer stirrer, and is more preferably a variable-frequency double-layer stirrer; the pore plate 6 has a pore diameter of
Figure BDA0002463483260000051
Uniformly distributed holes with porosity of more than 80 percent and the material is 304 stainless steel.
In the denitration process, the in-furnace spray gun 13 can be used independently, the in-vertical-flue spray gun 15 can be used independently, the in-furnace spray gun 13 and the in-vertical-flue spray gun 15 can be used simultaneously, preferably, the in-furnace spray gun 13 and the in-vertical-flue spray gun 15 are used simultaneously, the in-vertical-flue spray gun 15 or the in-furnace spray gun 13 can be arranged in parallel, in series or in series-parallel, and preferably, the two spray guns are arranged in a series-parallel mode.
The intelligent control unit comprises 1#Sensors 9, 2# Sensors 12, 3#The device comprises a sensor 16, a level meter 5, a feedback module 17, a central control computer 18, an operation and control module 19, a cutting-off module I20, a command execution module 21 and a cutting-off module II 22; 1 is described#The sensor 9 is a pressure/flow rate detecting instrument, 2# Sensor 12 is temperature/flow/NOXConcentration/oxygen content/CO concentration atmospheric measurement instrument, said 3# Sensor 16 is NOXHigh in concentrationA gas detection instrument;
1 is described#Sensor, 2#Sensor, 3#The sensors are all in communication connection with an operation and control module 19, the operation and control module 19 is in communication connection with a central control computer 18 through Ethernet, the level meter 5 is connected with the central control computer 18 through a feedback module 17, and the operation and control module 19 accurately controls the material suction amount of the material suction machine 2 and the material loading amount of the high-pressure air pump 10 through a command execution module 21;
the material level meter 5 is arranged in the intermediate bin 4 and below the positive pressure material conveying pipeline 7 and the orifice plate 6, and the device 1#The sensor 9 is arranged in the positive pressure material conveying pipeline 7, can be arranged between the back blowing electromagnetic valve 8 and the high-pressure air pump 10, and transmits the pressure and the flow speed in the pipeline to the operation and control module 19; 2 is described#The sensor 12 is arranged in the hearth 11 and used for measuring the temperature of the flue gas, the concentration of the original smoke dust, the flow rate of the flue gas and the original NO in the hearthXThe data of concentration, oxygen content, CO instantaneous concentration and the like are transmitted to the operation and control module 19; said 3#The sensor 16 is arranged at the exhaust port above the chimney 23, and NO of the exhaust port is dischargedXThe concentration is transmitted to the operation and control module 19; the operation and control module 19 analyzes the data and transmits the data to the central control computer 18 through the Ethernet, and the level meter 5 measures the storage quantity of the materials in the intermediate bin 4 and feeds back the signals to the central control computer 18 through the feedback module 17.
The command execution module 21 in the operation and control module 19 controls the suction machine 2 to start and stop suction, and controls the suction amount of the suction machine 2; if the data exceeds the set value and the control system fails, the cutting-off module I20 is started, and the manual feeding mode is changed;
the calculation and control module 19 analyses 2#Sensor, 3#The sensor transmits data, the command execution module 21 controls the high-pressure air pump 10 to start feeding and stop feeding, and controls the feeding amount of the high-pressure air pump 10 according to the data 1#The pressure and flow rate in the pipeline are corrected by the data transmitted by the sensor, so that the denitrifying agent is uniformly, stably and smoothly conveyed to the port of the spray gun, and if the data exceeds a set value and the control system fails, the cutting-off module II 22 is started, and the operation is changed into manual operationAnd (4) a dynamic feeding mode.
The operation and control system calculates the amount of the required denitration agent by analyzing the data transmitted by the sensor, controls the feeding amount of the feeding machine and the feeding amount of the positive pressure conveying pipeline by the command execution module, and conveys the denitration agent into the spray gun and the NO in the hearthXAnd (4) reacting to realize ultralow emission.
The working principle of the invention is as follows:
(1) 1 is described#The sensor 9 is a pressure/flow rate detecting instrument, 2# Sensors 12 and 3#The sensors 16 belong to atmosphere detection instruments respectively; the pressure and the flow speed in the pipeline are transmitted to an operation and control module 19; 2 is described#The sensor 12 measures the temperature, the concentration, the flow rate and the NO of the flue gas in the hearthXThe data of concentration, oxygen content, CO instantaneous concentration and the like are transmitted to the operation and control module 19; said 3# Sensor 16 will exhaust NOXThe concentration is transmitted to the operation and control module 19;
(2) intermediate bin 4 link to each other with auto sucking machine 2 through the pipeline, 4 upper portions in intermediate bin are provided with orifice plate 6, the inside dust that produces of separation auto sucking machine 2. Agitator 3 is installed to intermediate bin 4, agitator 3 can adopt anchor stirring mode or the double-deck stirring mode of frequency conversion to ensure the best shape of denitrifier, avoid the putty phenomenon to appear in the feed bin bottom.
(3) The upper part of the intermediate bin 4 is connected with a positive pressure material conveying pipeline 7 through a pipeline, and the positive pressure material conveying pipeline 7 is internally provided with a pipeline 1#Sensor 9, said 1#The sensor 9 detects the flow speed and pressure in the pipeline and transmits signals to the operation and control module 19, and the positive pressure material conveying pipeline 7 has small system resistance and ensures the conveying capacity of the denitrifying agent.
(4) A back-blowing electromagnetic valve 8 is arranged between the positive pressure material conveying pipeline 7 and the high-pressure air pump 10, the back-blowing electromagnetic valve 8 is provided with a back-blowing air storage tank, the rapping force is strong, the filtering efficiency is high, a filtering system is automatically cleaned, and good smoothness is ensured; the special maintenance is not needed, and the good feeding effect is ensured simply, conveniently and reliably, so that the smoothness of the pipeline is ensured.
(5) The positive pressure transfusionThe tail end of the material pipeline 7 is connected with a furnace inner spray gun 13 and a vertical flue inner spray gun 15, and the furnace inner spray gun 13, the vertical flue inner spray gun 15 or the double-open furnace inner spray gun 13 and the vertical flue inner spray gun 15 can be opened singly in the denitration working process; the spray guns 13 and 15 are reasonably and uniformly covered without dead angles in the hearth and the vertical flue, so as to ensure that the denitrifier and NO are mixedXAnd (4) fully reacting.
(6) Said 3#The sensor 16 is arranged at the discharge port above the chimney 23, the denitrated waste gas in the vertical flue 14 enters the chimney 23 after dedusting, desulfurizing and heavy metal removing, 3# Sensor 16 detects chimney 23 exhaust NOXThe concentration finally reaches the aim of standard emission.
The denitration rate of the system is more than 98 percent, and the emission concentration is less than 25mg/Nm3Far below the industrial emission standard.
Example 2
Taking a certain secondary lead smelting industry as an example, the oxidation furnace 2# Sensors 12, 3#The data transmitted by the sensor 16 is shown in the table 1, and the inside of the positive pressure material conveying pipeline 1#The sensor 9 transmits data as shown in table 2.
TABLE 1 Oxidation furnace 2# Sensors 12, 3#The sensor 16 transmits data
Figure BDA0002463483260000071
TABLE 2 Positive pressure Material conveying pipeline 1#Signal transmission data in sensor 9
Monitoring items Pressure (Mpa) Flow velocity (m)3/min)
Monitoring data 0.4 7.3
2#The sensor 12 transmits the temperature of the flue gas, the concentration of the original smoke dust, the flow rate of the flue gas and the original NO in the hearth to the operation and control module 19XData on monitoring of concentration, oxygen content, and CO instantaneous concentration, 3# Sensor 16 transmits exhaust NO to calculation and control module 19XThe concentration and level meter feeds back the material storage condition of the intermediate bin 4 to the operation and control module 19. The arithmetic and control module 19 receives 2#、3#After the transmission signal and the level gauge feedback signal are analyzed, the command execution module 21 controls the material suction machine 2 to be started and automatically sucks the material from the material bag 1 through the pipeline, and the material suction amount of the material suction machine 2 is 387.6kg/h in the embodiment. Auto sucking machine 2 sends the denitrifier to intermediate bin 4 through the pipeline, installs agitator 3 in intermediate bin 4, prevents that putty phenomenon from appearing in 4 portions of intermediate bin. The upper part of the intermediate bin 4 is provided with a pore plate for intercepting large-particle materials.
The upper part of the intermediate bin 4 is connected with a high-pressure air pump 10 through a positive-pressure material conveying pipeline 7. The calculation and control module 19 passes analysis 2# Sensors 12, 3#The sensor 16 transmits data, the feeding amount is controlled by the command execution module 21 by controlling the pressure and flow rate of the high-pressure air pump 10 in the positive pressure material conveying pipeline 7, and the data is analyzed by the analysis 1#The sensor transmits data to correct the pressure and flow rate in the pipeline. The conveying amount of the denitration agent in the positive pressure conveying pipeline 7 is 42 kg/h. The positive pressure material conveying pipeline 7 uniformly conveys the denitrifier into a spray gun system in the hearth. The spray gun is arranged in the hearth uniformly and reasonably without dead angle coverage, so that the denitration agent and NOx are ensured to fully react. The denitration efficiency of the system is 98.2%, and the NOx concentration of the discharge port is 24.6 mg/L. A back-blowing electromagnetic valve 8 is arranged between the positive pressure material conveying pipeline 7 and the high-pressure air pump 10, and the positive pressure material conveying pipeline 7 is blown and swept by nitrogen to prevent pipeline blockage.
Example 3
Taking a certain secondary lead smelting industry as an example, the reduction furnace 2# Sensors 12, 3#The data transmitted by the sensor 16 is shown in the table 3, and the inside of the positive pressure material conveying pipeline 1#The sensor 9 transmits data as shown in table 4.
TABLE 3 reduction furnace 2# Sensors 12, 3#The sensor 16 transmits data
Figure BDA0002463483260000081
TABLE 4 data transmission from sensors in positive pressure material conveying pipeline
Monitoring items Pressure (Mpa) Flow velocity (m)3/min)
Monitoring data 0.4 6.3
2#The sensor 12 transmits the temperature of the flue gas, the concentration of the original smoke dust, the flow rate of the flue gas and the original NO in the hearth to the operation and control module 19XData on monitoring of concentration, oxygen content, and CO instantaneous concentration, 3# Sensor 16 transmits exhaust NO to calculation and control module 19XThe concentration and level meter feeds back the material storage condition of the intermediate bin 4 to the operation and control module 19. The arithmetic and control module 19 receives 2#、3#After the transmission signal and the level gauge feedback signal are analyzed, the command execution module 21 controls the suction machine 2 to automatically suck the material from the material bag 1 through the pipeline, and the suction amount of the suction machine 2 in this embodiment is 357 kg/h. The auto sucking machine 2 sends the denitrifier to the intermediate bin 4 through a pipeline, the stirrer 3 is installed in the intermediate bin 4, and the occurrence of 4 parts of the intermediate bin is preventedAnd (4) material blockage. The upper part of the intermediate bin 4 is provided with a pore plate for intercepting large-particle materials.
The upper part of the intermediate bin 4 is connected with a high-pressure air pump 10 through a positive-pressure material conveying pipeline 7. The calculation and control module 19 passes analysis 2# Sensors 12, 3#The sensor 16 transmits data, the feeding amount is controlled by the command execution module 21 by controlling the pressure and flow rate of the high-pressure air pump 10 in the positive pressure material conveying pipeline 7, and the data is analyzed by the analysis 1#The sensor transmits data to correct the pressure and flow rate in the pipeline. The conveying amount of the denitration agent in the positive pressure conveying pipeline 7 is 35 kg/h. The positive pressure material conveying pipeline 7 uniformly conveys the denitrifier into a spray gun system in the hearth. The spray gun is arranged in the hearth uniformly and reasonably without dead angle coverage, so that the denitration agent and NOx are ensured to fully react. The denitration efficiency of the system is 98.11%, and the NOx concentration of the discharge port is 22.55 mg/L. A back-blowing electromagnetic valve 8 is arranged between the positive pressure material conveying pipeline 7 and the high-pressure air pump 10, and the positive pressure material conveying pipeline 7 is blown and swept by nitrogen to prevent pipeline blockage.

Claims (4)

1. A denitration ultralow emission process system for waste gas generated in smelting of regenerative nonferrous metal comprises a waste gas denitration device and an intelligent control unit; the waste gas denitration device comprises a material suction machine, an intermediate bin, a vertical flue, a hearth and a chimney, wherein the vertical flue is arranged above the hearth; the method is characterized in that: the material suction machine is connected with an intermediate bin through a pipeline, the upper part of the intermediate bin is connected with a positive pressure material conveying pipeline, a stirrer and a pore plate are arranged in the intermediate bin, the stirrer is arranged at the lower part of the intermediate bin, and the pore plate is arranged at the upper part of the intermediate bin and below the positive pressure material conveying pipeline; the tail end of the positive pressure material conveying pipeline is connected with one end of a high-pressure air pump, a back-blowing electromagnetic valve is arranged between the positive pressure material conveying pipeline and the high-pressure air pump, the other end of the high-pressure air pump is connected with a direct-rising flue inner spray gun and an in-furnace spray gun, the direct-rising flue inner spray gun is arranged in the direct-rising flue, and the in-furnace spray gun is arranged in the hearth;
the intelligent control unit comprises 1#Sensor, 2#Sensor, 3#Sensor, level meter, feedback module, central control computer, operation and control module, cut-offThe module I, the command execution module and the cutting-off module II;
1 is described#Sensor, 2#Sensor, 3#The sensors are in communication connection with the operation and control module, the operation and control module is in communication connection with the central control computer through Ethernet, the level meter is connected with the central control computer through the feedback module, and the operation and control module accurately controls the material suction amount of the material suction machine and the material feeding amount of the high-pressure air pump through the command execution module;
the material level meter is arranged in the intermediate bin and below the positive pressure material conveying pipeline and the orifice plate; 1 is described#The sensor is arranged in the positive pressure material conveying pipeline, is arranged between the back-blowing electromagnetic valve and the high-pressure air pump, and transmits the pressure and the flow speed in the pipeline to the operation and control module; 2 is described#The sensor is arranged in the hearth and used for measuring the temperature of the flue gas, the concentration of the original smoke dust, the flow rate of the flue gas and the original NO in the hearthXThe concentration, oxygen content and CO instantaneous concentration data are transmitted to an operation and control module; said 3#The sensor is arranged at the discharge port above the chimney for detecting NO at the discharge portXThe concentration is transmitted to an operation and control module; the operation and control module analyzes the data and transmits the data to the central control computer through the Ethernet, and the material level meter measures the storage quantity of the materials in the intermediate bin and feeds back the signals to the central control computer through the feedback module;
the command execution module in the operation and control module controls the material suction amount of the material suction machine by starting or stopping material suction; if the data exceeds a set value and the control system fails, the cutting-off module I is started, and manual feeding is changed;
the calculation and control module analyzes 2#Sensor, 3#The sensor transmits data, controls the feeding amount of the high-pressure air pump through the command execution module, and controls the feeding amount according to the value 1#The pressure and the flow rate in the pipeline are corrected by the transmission data of the sensor, so that the denitration agent is uniformly, stably and smoothly conveyed to the port of the spray gun, and if the data exceeds a set value and the control system fails, the cutting-off module II is started, and manual feeding is changed.
2. The system of claim 1, which is characterized in that: the stirrer is an anchor stirrer or a variable-frequency double-layer stirrer.
3. The system of claim 1, which is characterized in that: the pore plate is provided with uniformly distributed pores with the pore diameter of phi 0.1-0.5 mm, the porosity is greater than 80%, and the material is 304 stainless steel.
4. The system of claim 1, which is characterized in that: the spray guns in the vertical flue or the spray guns in the furnace are arranged in parallel, series or series-parallel.
CN202010330215.5A 2020-04-23 2020-04-23 Denitration ultralow-emission process system for waste gas generated in smelting of regenerated non-ferrous metal Pending CN111375296A (en)

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CN202010330215.5A CN111375296A (en) 2020-04-23 2020-04-23 Denitration ultralow-emission process system for waste gas generated in smelting of regenerated non-ferrous metal

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Application Number Priority Date Filing Date Title
CN202010330215.5A CN111375296A (en) 2020-04-23 2020-04-23 Denitration ultralow-emission process system for waste gas generated in smelting of regenerated non-ferrous metal

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