CN103884821B - A kind of thermal power plant generating tail gas nitrogen oxide component measurement mechanism and measuring method thereof - Google Patents
A kind of thermal power plant generating tail gas nitrogen oxide component measurement mechanism and measuring method thereof Download PDFInfo
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- CN103884821B CN103884821B CN201410147702.2A CN201410147702A CN103884821B CN 103884821 B CN103884821 B CN 103884821B CN 201410147702 A CN201410147702 A CN 201410147702A CN 103884821 B CN103884821 B CN 103884821B
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Abstract
The invention discloses a kind of thermal power plant generating tail gas nitrogen oxide component measurement mechanism, comprise exhaust uptake, sample gas collection tube, the first solenoid valve, sample gas filtering system, the 3rd solenoid valve, the second dust stores chamber, sample gas measures air cavity, nitrogen oxide sensor, pressure transducer, the 4th solenoid valve, the 5th solenoid valve, compressor and gas return conduit; Sample gas collection tube connects exhaust uptake, and the first solenoid valve is located on sample gas collection tube; Filtering gas air cavity and sample gas are measured air cavity and are connected, and multistorey strainer mesh is located in filtering gas air cavity; Second dust stores chamber, nitrogen oxide sensor and pressure transducer and is located in sample gas measurement air cavity, and the second dust stores chamber and connects return gas paths, and the 3rd solenoid valve is located on pipeline; Sample gas is measured air cavity and is connected with compressor and gas return conduit by three-way pipeline, and the 5th solenoid valve, the 4th solenoid valve are located on pipeline.The present invention realizes the automatically cleaning of measuring system inside, and maintenance cost is low.
Description
Technical field
The present invention relates to the measuring technique of oxides of nitrogen in coal steam-electric plant smoke, particularly relate to a kind of thermal power plant generating tail gas nitrogen oxide component measurement mechanism and measuring method thereof.
Background technology
China's nitrogen oxide emission increases year by year, and thermal power plant be discharge be main.The discharge of the oxides of nitrogen of air increases, very large to environmental hazard: form haze weather, forms acid rain.Therefore the monitoring of a kind of effective thermal power plant tail gas nitrogen oxide and measuring technique very necessary.The out of stock widespread use of current flue gas of power plants, out of stock technology mainly reduces nitrogen oxide in tail gas, sprays ammoniacal liquor, conversion of nitrogen oxides is become nitrogen.Reduce flue gas of power plants to the harm of atmospheric environment." fossil-fuel power plant atmospheric pollutant emission standard " has strict regulation to each content of component in tail gas, therefore monitors in real time the component (oxides of nitrogen and out of stock raw material ammonia) of tail gas, once find that discharge capacity is too high, needs to regulate out of stock process in real time.
Current China denitrating flue gas unit accounts for national active service fired power generating unit capacity 50%.For denitration, to this means that in 5 from now on middle of the month, still the have an appointment fired power generating unit of 400,000,000 kilowatts of the whole nation needed transformation.The unit of further conversion and existing unit, all need the monitoring carrying out flue gas.
Country is more and more stricter to power plant emission standard, and to oxides of nitrogen, sulfide equal size all has clear and definite laws and regulations requirement.Thermal power plant must carry out aftertreatment to discharge flue gas, and in the technique of aftertreatment, denitration process is commonplace.For strict emission standard, need to monitor in real time gas composition in flue.Main to oxides of nitrogen, the out of stock compound that adds is escaped (escape ammonia), and sulfide etc. is monitored in real time.
The tail gas of thermal power plant, temperature is high, and dust is large, and gas composition is more assorted.Therefore control measurement equipment needs the feature considering thermal power plant's tail gas, carries out measurement monitoring analysis.Watch-dog long-play in addition, require that the shutdown maintenance of watch-dog is short for maintenance period, cost of upkeep is low.Meet these enterprises required and be conducive to the maintenance operation cost that enterprise of thermal power plant saves equipment.
1. laser measurement method:
External producer adopts laser measurement method, be directly installed on flue and carry out measurement monitoring, require higher to flue, the position of flue, measurement point selects all there is strict requirement, in the tail gas of thermal power plant in addition, dust content is higher, laser emission point Emission Lasers, easily produces diffuse reflection, causes signal receiving end not receive normal signal, or the signal accepted is relatively weak, causes test data inaccurate.The testing apparatus of laser measurement scheme is higher at the operation expense in later stage in addition.
2. extract analytical approach out:
Take to extract sample gas from pipeline, be sent to laboratory internal analysis.Such equipment needs the pipeline grown very much to carry sample gas usually, and in the tail gas of thermal power generation process, dust content is relatively high, adopts long pipeline to carry out conveying sample gas and analyzes, be easy to cause line clogging; In flue, gas has high temperature greatly about about 200 degree, and high-temperature gas needs protection in transmission, needs to increase cost of equipment maintenance.
Summary of the invention
Object of the present invention: a kind of thermal power plant generating tail gas nitrogen oxide component measurement mechanism and measuring method thereof are provided, adopt control system to control compressor and produce pressurized air, the sample gas introducing exhaust uptake is measured, owing to containing dust in exhaust uptake, while exhaust uptake gas introduces measuring system, dust also can enter measuring system, multistorey strainer mesh and dust storage chamber is added with in system, store dust influential system when adsorption of dust on filter screen affects air inlet or dust storage box be, can by the different solenoid valves of switched system, system is allowed to be in dust clean conditions, the dust introducing measuring system is blown back in flue again, realize system from maintenance function.
Present device is few, layout needs space little, directly say at fume pipe and add test point, sample gas gathers at the scene, in-site measurement, sample gas measured value sends other system to by industrial signal (CAN/RS485/4 ~ 20mA), realize local collection, remote monitoring, brings the dust of the sample gas of system in employing process, control system can realize blowback and clean, and ensures the efficient long time running of system.
The present invention is except certainly safeguarding, also realize system monitoring function, air cavity is measured built with pressure transducer at sample gas, whether supervisory system internal pressure is normal, determine that the whether unobstructed or dust of filter plant stores dust memory space in chamber with this too much, affect normal air inlet, now need equipment itself to realize from maintenance, when system self-maintenance can not remove dust, operating personnel are reminded to carry out screen replacing.
To achieve these goals, technical scheme of the present invention is:
A kind of thermal power plant generating tail gas nitrogen oxide component measurement mechanism, comprises exhaust uptake, sample gas collection tube, the first solenoid valve, sample gas filtering system, the 3rd solenoid valve, the second dust stores chamber, sample gas measures air cavity, nitrogen oxide sensor, pressure transducer, the 4th solenoid valve, the 5th solenoid valve, compressor and gas return conduit, one end of described sample gas collection tube is communicated with described exhaust uptake, and described sample gas collection tube is vertical with described exhaust uptake, and the first described solenoid valve is arranged on described sample gas collection tube, described sample gas filtering system comprises the second solenoid valve, first dust stores chamber, filtering gas air cavity and multistorey strainer mesh, the other end of described sample gas collection tube is communicated with described filtering gas air cavity, it is trapezium structure wide at the top and narrow at the bottom that the first described dust stores chamber and the second dust storage chamber, the first described dust stores the bottom that chamber is arranged on described filtering gas air cavity, the first described dust is stored chamber and is communicated with described return gas paths by pipeline, the second described solenoid valve is arranged on the first described dust and stores on the pipeline between chamber and described return gas paths, described filtering gas air cavity is measured air cavity by pipeline with described sample gas and is connected, and described multistorey strainer mesh is arranged on described filtering gas air cavity and the junction of described pipeline, the second described dust stores chamber and is arranged on the bottom that described sample gas measures air cavity, the second described dust is stored chamber and is communicated with described return gas paths by pipeline, the 3rd described solenoid valve is arranged on the second described dust and stores on the pipeline between chamber and described return gas paths, and described nitrogen oxide sensor and pressure transducer are separately positioned on the top that described sample gas measures air cavity, described sample gas is measured air cavity and is connected with described compressor and gas return conduit by three-way pipeline, the 5th described solenoid valve is arranged on the pipeline between described sample gas measurement air cavity and described compressor, the 4th described solenoid valve is arranged on the pipeline between described sample gas measurement air cavity and described gas return conduit, and described gas return conduit is communicated with described exhaust uptake.
Above-mentioned thermal power plant's generating tail gas nitrogen oxide component measurement mechanism, wherein, also comprise control system, described control system is connected with the first described solenoid valve, the second solenoid valve, the 3rd solenoid valve, nitrogen oxide sensor, pressure transducer, the 4th solenoid valve, the 5th solenoid valve and compressor respectively.
The measuring method of 1, above-mentioned thermal power plant's generating tail gas nitrogen oxide component measurement mechanism, wherein, at least comprises the following steps:
S1: from described exhaust uptake by the sample gas collection tube described in the introducing of sample gas, carry out sampled measurements.
S1.1: described compressor produces pressurized air, the first described solenoid valve, the 4th solenoid valve and the 5th solenoid valve are opened, the second described solenoid valve and the 3rd closed electromagnetic valve, the pressurized air of described compressor, by the 5th described solenoid valve, enters described gas return conduit through the 4th described solenoid valve.
S1.2: the flowing of gas makes described sample gas measure air cavity inside and produces negative pressure, and the gas in described exhaust uptake enters described sample gas through described sample gas collection tube, the first solenoid valve and sample gas filtering system and measures air cavity.
S2: described control system cleans multistorey strainer mesh.
S2.1: described compressor produces pressurized air, and the first solenoid valve and the 5th solenoid valve are opened, described described the second solenoid valve, the 3rd solenoid valve and the 4th closed electromagnetic valve.
S2.2: the pressurized air of described compressor, by the 5th described solenoid valve, is measured air cavity, sample gas filtering system, the first solenoid valve and sample gas collection tube through described sample gas and turned back in described exhaust uptake.
S3: described control system stores chamber and the second dust storage chamber to the first described dust and cleans.
S3.1: described compressor produces pressurized air, and the second described solenoid valve, the 3rd solenoid valve and the 5th solenoid valve are opened, the first described solenoid valve and the 4th closed electromagnetic valve.
S3.2: the pressurized air of described compressor is by the 5th described solenoid valve, air cavity and sample gas filtering system is measured through described sample gas, pressurized air enters the first described dust and stores chamber and the second dust storage chamber, and is entered in described gas return conduit by the second described solenoid valve and the 3rd solenoid valve.
The present invention is fewer to existing flue duct retrofit; to the moving towards laterally of flue, longitudinally arrange special requirement; and this component measures the automatically cleaning that employing technology can realize measuring system inside; greatly reduce the time of maintenance shut-downs; thermal power plant can be realized and measure collection for a long time; on maintenance cost after long-time operation main concentration filter equipment filter screen, maintenance cost is low.
Accompanying drawing explanation
Fig. 1 is the front view of the present invention's a kind of thermal power plant generating tail gas nitrogen oxide component measurement mechanism and measuring method thereof.
Embodiment
Embodiments of the invention are further illustrated below in conjunction with accompanying drawing.
Refer to shown in accompanying drawing 1, a kind of thermal power plant generating tail gas nitrogen oxide component measurement mechanism, comprises exhaust uptake 1, sample gas collection tube 2, first solenoid valve 3, sample gas filtering system, the 3rd solenoid valve 8, second dust stores chamber 9, sample gas measures air cavity 10, nitrogen oxide sensor 11, pressure transducer 12, the 4th solenoid valve 13, the 5th solenoid valve 14, compressor 15 and gas return conduit 16, flue gas passes through from exhaust uptake 1, the flow direction of flue gas as shown by arrows, one end of described sample gas collection tube 2 is communicated with described exhaust uptake 1, described sample gas collection tube 2 is vertical with described exhaust uptake 1, when gas downstream produces negative pressure, the gas of exhaust uptake 1 enters sampled downstream system by sample gas collection tube 2, and the first described solenoid valve 3 is arranged on described sample gas collection tube 2, for controlling the break-make of sample gas collection tube 2, described sample gas filtering system comprises the second solenoid valve 4, first dust stores chamber 5, filtering gas air cavity 6 and multistorey strainer mesh 7, second solenoid valve 4 was connected in the device self-maintenance stage, the first dust dust stored in chamber 5 has subsequent gases and is blown in exhaust uptake 1, realize control system from safeguarding, first dust stores chamber 5 for storing dust at equipment run duration, dust in first dust storage chamber 5 is from two kinds of duties, when sample gas gathers, sample gas encounters multistorey strainer mesh 7 due to Action of Gravity Field, the region that the first dust stores chamber 5 can be stored in, in addition, equipment is blowing multistorey strainer mesh 7 stage, originally the dust of multistorey strainer mesh 7 is adsorbed on, due to the blowback of gas, dust fractions drops on the first dust and stores in chamber 5, filtering gas air cavity 6 is the air cavity of filtering gas, multistorey strainer mesh 7 selects the specification of filter screen according to the actual conditions of thermal power plant, in practical usage situations, preferred multistorey strainer mesh, the other end of described sample gas collection tube 2 is communicated with described filtering gas air cavity 6, it is trapezium structures wide at the top and narrow at the bottom that the first described dust stores chamber 5 and the second dust storage chamber 9, the first described dust stores the bottom that chamber 5 is arranged on described filtering gas air cavity 6, the first described dust is stored chamber 5 and is communicated with described return gas paths 16 by pipeline, the second described solenoid valve 4 is arranged on the first described dust and stores on the pipeline between chamber 5 and described return gas paths 16, described filtering gas air cavity 6 is measured air cavity 10 by pipeline with described sample gas and is connected, and described multistorey strainer mesh 7 is arranged on described filtering gas air cavity 6 and the junction of described pipeline, the second described dust stores chamber 9 and is arranged on the bottom that described sample gas measures air cavity 10, the second described dust is stored chamber 9 and is communicated with described return gas paths 16 by pipeline, the 3rd described solenoid valve 8 is arranged on the second described dust and stores on the pipeline between chamber 9 and described return gas paths 16, second dust storage chamber 9 stores the dust in sample gas measurement air cavity 10, when when reaching a certain amount of, influential system is measured and is gathered, control system can control to enter from maintenance state, 3rd solenoid valve 8 is opened, the second dust dust stored in chamber 9 can be turned back in exhaust uptake 1 by the 3rd solenoid valve 8 and go, described nitrogen oxide sensor 11 and pressure transducer 12 are separately positioned on the top that described sample gas measures air cavity 10, described sample gas is measured air cavity 10 and is connected with described compressor 15 and gas return conduit 16 by three-way pipeline, the 5th described solenoid valve 14 is arranged on the pipeline between described sample gas measurement air cavity 10 and described compressor 15, the 4th described solenoid valve 13 is arranged on the pipeline between described sample gas measurement air cavity 10 and described gas return conduit 16, described gas return conduit 16 is communicated with described exhaust uptake 1, and measuring system tail gas is returned thermal power plant's exhaust uptake 1 by gas return conduit 16.
Also comprise control system 17, described control system 17 is connected with described the first solenoid valve 3, second solenoid valve 4, the 3rd solenoid valve 8, nitrogen oxide sensor 11, pressure transducer 12, the 4th solenoid valve 13, the 5th solenoid valve 14 and compressor 15 respectively.At equipment run duration, control system 17 controls the information of nitrogen oxide sensor 11 and pressure transducer 12, control the first solenoid valve 3, second solenoid valve 4, the 3rd solenoid valve 8, the 4th solenoid valve 13 and the 5th solenoid valve 14 simultaneously, realization operates in sample gas acquisition state, filter plant clean conditions, with device self-maintenance state, control system 17 controls the 4th solenoid valve 13 and the 5th solenoid valve 14 and enters measuring equipment and enter different states.The content of the oxides of nitrogen in nitrogen oxide sensor 11 collecting sample gas, by the Signal transmissions of collection in control system 17, pressure transducer 12 test specimens gas measures the gaseous tension in air cavity 10, and by the Signal transmissions of collection in control system 17.Control system 17 controls the pressurized air that compressor 15 produces system needs, and pressurized air is the power source of whole system, can carry out the introducing of sample gas and certainly safeguarding and automatically cleaning of system.Control system 17 can by the state transfer of signal system that gathers in the out of stock system of thermal power plant, for out of stock system reference, control system 17 can realize multi-signal transfer mode: CAN signal is transmitted, RS485 transmission or the transmission of 4 ~ 20mA current signal.
A measuring method for thermal power plant's generating tail gas nitrogen oxide component measurement mechanism, the method at least comprises the following steps:
S1: from described exhaust uptake 1 by the sample gas collection tube 2 described in the introducing of sample gas, carry out sampled measurements.
S1.1: described compressor 15 produces stable pressurized air, the first described solenoid valve 3, the 4th solenoid valve 13 and the 5th solenoid valve 14 are opened, the second described solenoid valve 4 and the 3rd solenoid valve 8 are closed, the pressurized air of described compressor 15, by the 5th described solenoid valve 14, enters described gas return conduit 16 through the 4th described solenoid valve 13.
S1.2: due to the flowing of gas, described sample gas is measured air cavity 10 inside and is produced negative pressure, gas in described exhaust uptake 1 enters described sample gas through described sample gas collection tube 2, first solenoid valve 3 and sample gas filtering system and measures air cavity 10, when system is after this state keeps the several seconds, sample gas measures the flow of the sample gas in air cavity 10, pressure stability, the data now gathered are effective; Gas is flowed through by illustrated direction and measures chamber, completes gas in measurement inside.In sample gas gatherer process, the dust of exhaust uptake 1 can enter system, and dust can be adsorbed on multistorey strainer mesh 7, or being stored in the first dust stores in chamber 5 and the second dust storage chamber 9.After long-play equipment, be adsorbed on dust in multistorey strainer mesh 7 and the first dust and store the passage that chamber 5 and the second dust dust stored in chamber 9 can affect air flue, affect pressure and flow in sample gas measurement air cavity 10.
S2: described control system 17 pairs of multistorey strainer meshes 7 clean; After system cloud gray model a period of time, the multistorey strainer mesh 7 in filtering gas air cavity 6 has adsorbed a large amount of dust, and enter in sample gas measurement air cavity 10 for ensureing that gas is normally unobstructed, control system 17 needs to clean assembly 7 filter plant.
S2.1: described compressor 15 produces stable pressurized air, the first solenoid valve 3 and the 5th solenoid valve 14 are opened, and described described the second solenoid valve 4, the 3rd solenoid valve 8 and the 4th solenoid valve 13 are closed.
S2.2: the pressurized air of described compressor 15, by the 5th described solenoid valve 14, is measured air cavity 10, sample gas filtering system, the first solenoid valve 3 and sample gas collection tube 2 through described sample gas and turned back in described exhaust uptake 1; The dust that gas is flowed through on sample gas filtering system and multistorey strainer mesh 7 by illustrated direction can leave sample gas filtering system and multistorey strainer mesh 7 due to oppositely blowing of pressure gas, turns back in exhaust uptake 1 or be stored in the first dust to store in chamber 5.
S3: described control system 17 stores chamber 5 and the second dust storage chamber 9 to the first described dust and cleans; After system cloud gray model a period of time, first dust stores chamber 5 and the second dust storage chamber 9 and stores a large amount of dust, enter in sample gas measurement air cavity 10 for ensureing that gas is normally unobstructed, control system needs to store chamber 5 and the second dust storage chamber 9 to the first dust and cleans.
S3.1: described compressor 15 produces stable pressurized air, the second described solenoid valve 4, the 3rd solenoid valve 8 and the 5th solenoid valve 14 are opened, and the first described solenoid valve 3 and the 4th solenoid valve 13 are closed.
S3.2: the pressurized air of described compressor 15 is by the 5th described solenoid valve 14, air cavity 10 and sample gas filtering system is measured through described sample gas, pressurized air enters the first described dust and stores chamber 5 and the second dust storage chamber 9, and is entered in described gas return conduit 16 by the second described solenoid valve 4 and the 3rd solenoid valve 8.Gas stores chamber 5 and the second dust by illustrated first dust and stores chamber 9, first dust and store chamber 5 and the second dust and store dust in chamber 9 and to be blown in exhaust uptake 1 by air-flow and to realize system self-maintenance.
In sum; the present invention is fewer to existing flue duct retrofit; to the moving towards laterally of flue, longitudinally arrange special requirement; and this component measures the automatically cleaning that employing technology can realize measuring system inside; greatly reduce the time of maintenance shut-downs; can realize thermal power plant and measure collection for a long time, on the maintenance cost main concentration filter equipment filter screen after long-time operation, maintenance cost is low.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure transformation utilizing description of the present invention to do; or directly or indirectly use the technical field being attached to other Related products, be all in like manner included in scope of patent protection of the present invention.
Claims (3)
1. thermal power plant's generating tail gas nitrogen oxide component measurement mechanism, is characterized in that: comprise exhaust uptake, sample gas collection tube, the first solenoid valve, sample gas filtering system, the 3rd solenoid valve, the second dust stores chamber, sample gas measures air cavity, nitrogen oxide sensor, pressure transducer, the 4th solenoid valve, the 5th solenoid valve, compressor and gas return conduit, one end of described sample gas collection tube is communicated with described exhaust uptake, and described sample gas collection tube is vertical with described exhaust uptake, and the first described solenoid valve is arranged on described sample gas collection tube, described sample gas filtering system comprises the second solenoid valve, first dust stores chamber, filtering gas air cavity and multistorey strainer mesh, the other end of described sample gas collection tube is communicated with described filtering gas air cavity, it is trapezium structure wide at the top and narrow at the bottom that the first described dust stores chamber and the second dust storage chamber, the first described dust stores the bottom that chamber is arranged on described filtering gas air cavity, the first described dust is stored chamber and is communicated with described gas return conduit by pipeline, the second described solenoid valve is arranged on the first described dust and stores on the pipeline between chamber and described gas return conduit, described filtering gas air cavity is measured air cavity by pipeline with described sample gas and is connected, and described multistorey strainer mesh is arranged on described filtering gas air cavity and the junction of described pipeline, the second described dust stores chamber and is arranged on the bottom that described sample gas measures air cavity, the second described dust is stored chamber and is communicated with described gas return conduit by pipeline, the 3rd described solenoid valve is arranged on the second described dust and stores on the pipeline between chamber and described gas return conduit, and described nitrogen oxide sensor and pressure transducer are separately positioned on the top that described sample gas measures air cavity, described sample gas is measured air cavity and is connected with described compressor and gas return conduit by three-way pipeline, the 5th described solenoid valve is arranged on the pipeline between described sample gas measurement air cavity and described compressor, the 4th described solenoid valve is arranged on the pipeline between described sample gas measurement air cavity and described gas return conduit, and described gas return conduit is communicated with described exhaust uptake.
2. thermal power plant according to claim 1 generating tail gas nitrogen oxide component measurement mechanism, it is characterized in that: also comprise control system, described control system is connected with the first described solenoid valve, the second solenoid valve, the 3rd solenoid valve, nitrogen oxide sensor, pressure transducer, the 4th solenoid valve, the 5th solenoid valve and compressor respectively.
3. utilize the measurement mechanism described in claim 2 to carry out the method measured, it is characterized in that: at least comprise the following steps:
S1: from described exhaust uptake by the sample gas collection tube described in the introducing of sample gas, carry out sampled measurements;
S1.1: described compressor produces pressurized air, the first described solenoid valve, the 4th solenoid valve and the 5th solenoid valve are opened, the second described solenoid valve and the 3rd closed electromagnetic valve, the pressurized air of described compressor, by the 5th described solenoid valve, enters described gas return conduit through the 4th described solenoid valve;
S1.2: the flowing of gas makes described sample gas measure air cavity inside and produces negative pressure, and the gas in described exhaust uptake enters described sample gas through described sample gas collection tube, the first solenoid valve and sample gas filtering system and measures air cavity;
S2: described control system cleans multistorey strainer mesh;
S2.1: described compressor produces pressurized air, and the first solenoid valve and the 5th solenoid valve are opened, the second described solenoid valve, the 3rd solenoid valve and the 4th closed electromagnetic valve;
S2.2: the pressurized air of described compressor, by the 5th described solenoid valve, is measured air cavity, sample gas filtering system, the first solenoid valve and sample gas collection tube through described sample gas and turned back in described exhaust uptake;
S3: described control system stores chamber and the second dust storage chamber to the first described dust and cleans;
S3.1: described compressor produces pressurized air, and the second described solenoid valve, the 3rd solenoid valve and the 5th solenoid valve are opened, the first described solenoid valve and the 4th closed electromagnetic valve;
S3.2: the pressurized air of described compressor is by the 5th described solenoid valve, air cavity and sample gas filtering system is measured through described sample gas, pressurized air enters the first described dust and stores chamber and the second dust storage chamber, and is entered in described gas return conduit by the second described solenoid valve and the 3rd solenoid valve.
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| CN109342654A (en) * | 2018-10-08 | 2019-02-15 | 宁波安创电子科技有限公司 | A kind of nitrogen oxide sensor of air inlet protection |
| CN114196907A (en) * | 2021-11-27 | 2022-03-18 | 上海春玉金属热处理有限公司 | Carbonitriding heat treatment equipment and method based on computer simulation |
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