CN118776993A - Tail gas analysis method - Google Patents
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- CN118776993A CN118776993A CN202411081037.1A CN202411081037A CN118776993A CN 118776993 A CN118776993 A CN 118776993A CN 202411081037 A CN202411081037 A CN 202411081037A CN 118776993 A CN118776993 A CN 118776993A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 32
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- 229910002651 NO3 Inorganic materials 0.000 claims description 7
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 7
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 24
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Abstract
The embodiment of the application relates to the technical field of material determination by a chemical method, in particular to an exhaust gas analysis method. The tail gas component and element content online analysis method is suitable for analyzing the tail gas of the rotary calciner of the cold crucible, and comprises the following steps S1 to S4: s1: the tail gas pipeline of the rotary calciner is provided with a first sampling port and a second sampling port respectively, and tail gas is obtained through the first sampling port and the second sampling port. S2: and carrying out tail gas component analysis on the tail gas obtained by the first sampling port. S3: and analyzing the tail gas element content of the tail gas obtained by the second sampling port. S4: and (3) determining the tail gas of the rotary calciner according to the tail gas component obtained in the step S2 and the tail gas element content obtained in the step S3. The tail gas on-line analysis method provided by the embodiment of the application can simultaneously analyze the tail gas components and the tail gas element content of the tail gas of the rotary calciner, thereby determining the tail gas composition of the rotary calciner.
Description
Technical Field
The embodiment of the application relates to the technical field of material determination by a chemical method, in particular to an online analysis method for tail gas components and element contents.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The rotary calciner is used for treating radioactive waste liquid, tail gas generated in the treatment process is discharged from the furnace end of the rotary calciner, and the process operation condition in the rotary calciner can be determined through the content analysis of components in the tail gas.
However, due to the complex composition of the tail gas and its radioactivity, no better method for analyzing the tail gas exists at present.
Disclosure of Invention
The following presents a simplified summary of the application in order to provide a basic understanding of some aspects of the application. It should be understood that this summary is not an exhaustive overview of the application. It is not intended to identify key or critical elements of the application or to delineate the scope of the application. Its purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.
The embodiment of the application provides a tail gas analysis method, which is suitable for analyzing the tail gas of a rotary calciner of a cold crucible, and comprises the following steps of S1 to S4:
s1: the tail gas pipeline of the rotary calciner is provided with a first sampling port and a second sampling port respectively, and tail gas is obtained through the first sampling port and the second sampling port.
S2: and carrying out tail gas component analysis on the tail gas obtained by the first sampling port.
S3: and analyzing the tail gas element content of the tail gas obtained by the second sampling port.
S4: and (3) determining the tail gas composition of the rotary calciner according to the tail gas component obtained in the step S2 and the tail gas element content obtained in the step S3.
According to the tail gas component and element content online analysis method provided by the embodiment of the application, different sampling ports are respectively adopted to analyze the tail gas component and the tail gas element content, so that the problems of complex tail gas components and difficult analysis are solved, and the tail gas can be analyzed in situ in a tail gas pipeline, so that the tail gas is not required to be transferred, and the problem of leakage of radioactive tail gas is avoided. The tail gas component analysis and the tail gas element content analysis can be carried out on the tail gas of the rotary calciner, and the change of the tail gas composition can be timely and effectively obtained through the tail gas analysis, so that the process running state in the rotary calciner can be mastered, and the process running state in the rotary calciner can be timely adjusted according to actual demand conditions.
Drawings
To further clarify the above and other advantages and features of the present application, a more particular description of the application will be rendered by reference to the appended drawings. The accompanying drawings are incorporated in and form a part of this specification, along with the detailed description that follows. Elements having the same function and structure are denoted by the same reference numerals. It is appreciated that these drawings depict only typical examples of the application and are therefore not to be considered limiting of its scope.
FIG. 1 is a flow chart of an exhaust gas analysis method according to an embodiment of the present application;
Fig. 2 is a schematic diagram of an exhaust gas detection system according to an embodiment of the present application.
It should be noted that the drawings are not necessarily to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.
Reference numerals illustrate: 110. a tail gas pipeline; 120. a first sampling port; 121. a first sampling member; 130. a second sampling port; 131. a second sampling member;
210. A first sampling line; 220. a gas component detection device; 230. a dilution mechanism; 240. a first pretreatment device;
310. A second sampling line; 320. an X-ray fluorescence spectrometer; 330. and a second pretreatment device.
Detailed Description
Exemplary embodiments of the present application will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made in order to achieve the developer's specific goals, such as compliance with system-and business-related constraints, and that these constraints will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
It should be noted here that, in order to avoid obscuring the present application due to unnecessary details, only the device structures and/or processing steps closely related to the solution according to the present application are shown in the drawings, while other details not greatly related to the present application are omitted.
The following disclosure provides many different embodiments, or examples, for implementing the application. In order to simplify the present disclosure, specific example components and methods are described below. They are, of course, merely examples and are not intended to limit the application. In the description of the embodiments of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless explicitly defined otherwise.
The rotary calciner of the cold crucible is used for treating high-radioactivity waste liquid, and a large amount of nitrogen oxides are contained in the waste liquid and can be discharged along with tail gas in the calcination process. Because the environment inside the rotary calciner is complex, the process running state is not easy to monitor. In addition, since the radioactive waste liquid contains a large amount of impurities, it is difficult to analyze the components of the tail gas. In addition, since the tail gas is radioactive, radioactive contamination may also occur during the process of transferring the tail gas.
In view of the above problems, an embodiment of the present application provides an online analysis method for components and element contents of exhaust gas, which is suitable for analyzing exhaust gas of a rotary calciner of a cold crucible, and referring to fig. 1, the method includes steps S1 to S4 as follows.
S1: the tail gas pipeline of the rotary calciner is provided with a first sampling port and a second sampling port respectively, and tail gas is obtained through the first sampling port and the second sampling port.
S2: and carrying out tail gas component analysis on the tail gas obtained by the first sampling port.
S3: and analyzing the tail gas element content of the tail gas obtained by the second sampling port.
S4: and (3) determining the tail gas of the rotary calciner according to the tail gas component obtained in the step S2 and the tail gas element content obtained in the step S3.
According to the tail gas component and element content online analysis method provided by the embodiment of the application, different sampling ports are respectively adopted to analyze the tail gas component and the tail gas element content, so that the problems of complex tail gas components and difficult analysis are solved, and the tail gas can be analyzed in situ in a tail gas pipeline, so that the tail gas is not required to be transferred, and the problem of leakage of radioactive tail gas is avoided. The tail gas component analysis and the tail gas element content analysis can be carried out on the tail gas of the rotary calciner, and the change of the tail gas can be timely and effectively obtained through the tail gas analysis, so that the process running state in the rotary calciner can be mastered, and the process running state in the rotary calciner can be timely adjusted according to actual demand conditions.
In some embodiments, in step S2 and step S3, the tail gas may be automatically and continuously sampled and the sampled amount recorded in real time.
The tail gas is automatically and continuously sampled, so that the continuous and accurate content of the tail gas components and elements can be obtained, the reaction condition in the rotary calciner is continuously monitored, and the process running state of the rotary calciner is timely adjusted according to the monitoring result.
In some embodiments, in step S2, after sampling, it is diluted, after which analysis of the tail gas components is performed.
In an actual detection process, the concentration of the gas component in the tail gas may exceed the range of the analyzer, thereby resulting in interruption of the detection process. Therefore, after sampling, the tail gas can be diluted, so that the concentration of the gas component in the tail gas is lower than the measuring range of the gas analysis mechanism, and continuous sampling of the tail gas can be realized.
In some embodiments, the tail gas is diluted with nitrogen as a diluent gas, and a plurality of nitrogen cylinders and cylinder switching devices are used to form a dilution mechanism to enable the diluent gas to be continuously provided for a predetermined period of time.
Because various nitrogen oxides contained in the tail gas can be converted in the oxygen, nitrogen which does not react with the nitrogen oxides is selected as diluent gas, so that the analysis result of the analyzer is consistent with the actual gas components in the tail gas. On the basis, the dilution mechanism is provided with a plurality of nitrogen cylinders and a cylinder switching device, so that the dilution gas can be continuously supplied for a long time, for example, more than one week, without ventilation. The capacity of the nitrogen gas cylinders can be more than 50L, the pressure of the nitrogen gas cylinders can be 20Mpa, and the number of the nitrogen gas cylinders can be 4.
In some embodiments, in steps S2 and S3, the obtained gas sample is maintained at a predetermined temperature and the detection device is periodically purged to avoid clogging of the detection device.
The dust and impurities of the larger particles contained in the tail gas may cause the sampling device of the detection apparatus to be blocked, thereby causing the detection process to be interrupted, so that the detection apparatus needs to be purged periodically to ensure that the sampling can be continuously performed.
In some embodiments, the predetermined temperature may be set above the dew point of the acidic solution.
In a general scene, the concentration of NO 2 and the concentration of water vapor do not reach more than 40%, however, in the tail gas treated by the embodiment of the application, the concentration of NO 2 and the concentration of water vapor are both more than 40%, NO 2 can react with water vapor in the tail gas to generate a strong corrosive acidic solution, and the high-acid high-humidity tail gas can corrode a detection pipeline and a detection instrument. By heating the temperature of the gas above the dew point of the acidic solution, liquefaction of the acidic solution can be prevented, thereby reducing corrosion of the detection equipment by the acidic solution. Further, the predetermined temperature may be set at one of 80-180 ℃ and when the temperature of the exhaust gas is greater than 180 ℃, the exhaust gas is not heated to save energy.
In some embodiments, the temperature of the piping from the exhaust gas acquisition site to the exhaust gas analysis site is kept stable in step S2 and step S3.
The temperature stability of the pipeline is ensured, and the concentration distortion of the gas component caused by the temperature change of the tail gas can be avoided. In particular, the temperature of the pipeline can be kept stable by heating and insulating the pipeline.
In some embodiments, in steps S2 and S3, the tail gas is dried and dedusted prior to analysis.
The tail gas is dried and dedusted, so that the tail gas is dried and clean, and the detection equipment is prevented from being blocked. And drying and dust removal treatment can also reduce acidic substances contained in tail gas so as to protect detection equipment and prolong the service life of the detection equipment.
In some embodiments, condensate obtained from the removal of water from the exhaust is obtained, and the concentration of nitrate in the condensate is determined, and the loss of NO x in the exhaust is corrected based on the determined concentration of nitrate.
During the condensation, part of the nitrogen element is separated from the tail gas in the form of acidic substances dissolved in the condensed water. The nitrate concentration in the condensed water can be determined through laboratory comparison analysis and pH test, so that the loss of NO x in the tail gas can be corrected, and the detection result is more accurate.
In some embodiments, in step S3, the element content in the tail gas is analyzed using a fluorescence spectrum of radiation, and the tail gas is pumped from the bypass to the analysis location in the gap of the fluorescence spectrum analysis of radiation.
The energy dispersion type X-ray fluorescence spectrum analysis principle is adopted in the ray fluorescence spectrum analysis, and the membrane enrichment technology is used, so that the high precision and the low detection limit of the detection can be ensured. The analysis process of the X-ray fluorescence spectrum on the element content in the tail gas is intermittent, and in a gap of the analysis of the X-ray fluorescence spectrum, the tail gas does not flow, so that oxygen above a paper tape for testing is condensed, acid drops on the blank paper tape which is not sampled, and the paper tape is adhered and damaged. Based on the reasons, in the method provided by the embodiment of the application, in the gap of the radiation fluorescence spectrum analysis, the tail gas can be pumped away from the analysis position through the bypass by switching the three-way switching electromagnetic valve arranged at the sampling port of the detection equipment, so that the paper tape is prevented from being damaged.
In some embodiments, in step S2, the tail gas is filtered by way of a first stage filtration and a second stage filtration, wherein the first stage filtration has a particle size greater than the particle size of the second stage filtration, prior to analysis.
The larger the particle size of the filter, the poorer the filtering effect, but the larger the flow of gas and the less likely it is to become clogged. The multi-stage filtration does not have a large impact on the flow of gas, while filtering out larger particles during the first stage filtration, thereby reducing the likelihood of the secondary filter being plugged, as compared to using only a filter having a smaller particle size. And compared with the filter with larger granularity, the multi-stage filtering can generate better filtering effect. Specifically, the first stage filtration may be performed using a 1 μm particle size filter, and then the second stage filtration may be performed using a 0.2 μm particle size filter, such filtration being capable of ensuring smoothness and reliability of sampling.
In some embodiments, in step S1, the exhaust gas may be obtained from the second sampling port by a high-flow extraction method, for example, a high-flow channel suction pump may be used, and the pipeline is caused to generate negative pressure by the movement of the pump membrane, so as to obtain the exhaust gas from the second sampling port. Further, the volume content ratio of the tail gas element can be analyzed by calculating the flow rate of the tail gas, for example, a flow valve can be arranged at the front end of the air pump to calculate the flow rate of the tail gas.
In some embodiments, in step S1, the sampling port may be connected to the exhaust gas pipe by way of flange connection, and in other embodiments, the exhaust gas pipe may also be made into the sampling port. Further, in order to make the tail gas state in tail gas pipeline that the sample obtained unanimous, can not receive the influence of detection channel material, can be unanimous with tail gas pipeline with the pipe diameter and the material setting of sample connection.
In some embodiments, the exhaust gas analysis method further comprises step S5: and returning the analyzed tail gas to a downstream sample pipeline, and finally entering a tail gas treatment facility.
In the embodiment of the application, the components of the tail gas comprise high-concentration NO, NO 2 and N 2 O, the gases can influence the human body and the environment, and the analyzed tail gas is returned to the downstream sample pipeline, so that the influence of the tail gas on experimental personnel and the environment can be reduced.
In some embodiments, the exhaust analysis system implementing the exhaust analysis method may be controlled by software to implement the functions of automatically sampling, purging, calibrating, maintaining log, and the like, and sorting and transmitting. Furthermore, after the results of the analysis of the components of the tail gas and the analysis of the content of the elements of the tail gas are summarized to one industrial personal computer, the analysis results are further analyzed by the industrial personal computer, the industrial personal computer is used for debugging the detection equipment, and the parameters of the analyzer are set.
In some embodiments, in step S2, when the tail gas is diluted, the flow of the dilution gas may be further adjusted so that the concentration of the diluted tail gas is a preset dilution concentration.
In some embodiments, in step S2, before the exhaust gas component analysis is performed on the exhaust gas, a mixed gas of nitrogen oxides and nitrogen may be tested to understand the linearity of the dilution factor, and the dilution factor may be corrected during the subsequent experiment, where the nitrogen oxides are a mixture of NO, NO 2 and N 2 O. Wherein the concentration of nitrogen oxides is greater than 10%. Further, the mass flowmeter in the gas calibrator of the gas component detection device can be calibrated before the system works to ensure the accuracy of the flow distribution system of the calibrator, and the flow sensor in the X-ray fluorescence spectrometer can be calibrated to accurately acquire the sampling volume of the tail gas, so that the accuracy of the gas flow of the element content analysis mechanism is ensured.
In some embodiments, in step S2, the gas sample may be filtered to remove dust and impurities from the gas sample, and the filtering device is purged to avoid clogging of the sampling device. The particle size of the filtration may be, for example, 5 μm.
Since it is necessary to detect the content of a specific element in the particulate matter in the exhaust gas, in step S3, the gas for which element content analysis is necessary is not excessively removed. To prevent the pipe from being corroded or clogged, a thicker pipe made of corrosion-resistant material is used to guide the exhaust gas into the analyzer, and for example, a pipe made of polytetrafluoroethylene having a diameter of 8mm may be used to guide the exhaust gas into the analyzer. The time of purging may be controlled manually or automatically.
Further, a corrosion-resistant material may be used as a material of a portion of the detection device in direct contact with the exhaust gas, such as 316L stainless steel or polytetrafluoroethylene.
Since factors which possibly influence the detection result exist in the detection process, the detection result needs to be calibrated and corrected. In some embodiments, the detection system also includes other analysis mechanisms that require the analysis of the exhaust gas with the aid of optical lenses that require purging with a purge gas to keep the mirror clean. Because the gas flow of the tail gas is smaller (less than 100L/min), and the flow of the purge gas is larger (5L/min), the purge gas can have a certain influence on the analysis result, so that the first sampling port and the second sampling port can be arranged at the upstream of the tail gas pipeline in the step S1 to obtain the tail gas with smaller influence of the purged gas, and other analyses are performed on the tail gas at the downstream of the tail gas pipeline, so that the influence of the purge gas on the gas component analysis result and the element content analysis result is reduced. Furthermore, the opening and closing of the purge gas can be controlled, the influence of the purge gas on the analysis result is obtained according to the analysis results under different conditions, and the analysis result is corrected according to the obtained influence, so that the analysis result is more accurate.
In some embodiments, the error in the sampling process can be corrected according to the temperature of the tail gas and the calibration result of the instrument before and during analysis, so as to reduce the influence of the temperature on the analysis result.
In some embodiments, in the step S2 and the step S3, during the process of analyzing the gas component and the element content of the tail gas, the detection device may be calibrated directly without dilution by using relatively stable nitrogen as a background and using a mixed gas of nitrogen and nitrogen oxide as a calibration gas, where the concentration of the nitrogen oxide in the mixed gas is greater than 10% at predetermined intervals, for example, more than 24 hours. In addition, the standard substance membrane can be used for calibrating the detection device every preset time, such as more than one week. The accuracy of the analysis result can be ensured by calibrating the detection equipment.
In some embodiments, in step S1, when an emergency situation occurs and the preheating time of the instrument is insufficient, the detection device may be calibrated, so as to reduce detection errors caused by the insufficient preheating time.
In some embodiments, in step S3, when the exhaust gas elemental content analysis is performed for the detection apparatus using the detection apparatus reinstalled after being disassembled, curve fitting calibration may be performed for the detection apparatus, avoiding detection errors due to effective area variation.
In some embodiments, in step S2 and step S3, the tail gas may be dried by liquefying water vapor in the tail gas, and then the tail gas may be dried by, for example, a method of resin adsorption. In addition, the particulate matter in the exhaust gas can be removed by filtering the exhaust gas.
In some embodiments, in step S2, during the process of diluting the tail gas, the flow rate of the tail gas may also be detected, and the flow rate of the dilution gas released in the dilution mechanism may be determined according to the flow rate. In addition, the flow of the tail gas can be controlled, so that the flow of the tail gas is kept at a stable value, and the concentration of the diluted tail gas is not influenced due to the change of the flow of the tail gas in the tail gas pipeline. Specifically, the flow rate of the exhaust gas can be detected by a flow meter, and the flow rate of the exhaust gas can be controlled by a proportional valve.
In some embodiments, the analysis method further includes periodically maintaining equipment of the exhaust gas analysis system and replacing consumables of the exhaust gas analysis system to ensure that the exhaust gas analysis system is reliably operational over a long period of time.
The method for analyzing exhaust gas according to the present application is described below with reference to fig. 2 and the embodiment.
The first sampling port 120 and the second sampling port 130 are respectively provided on the tail gas pipe 110 of the rotary calciner, and the first sampling port 120 and the second sampling port 130 are connected with the tail gas pipe 110 by using flanges. The first sampling port 120 is provided with a first sampling member 121, the second sampling port 130 is provided with a second sampling member 131, and the first sampling member 121 and the second sampling member 131 respectively introduce tail gas into the first sampling pipeline 210 and the second sampling pipeline 310 and record the sampled quantity in real time. The first and second sampling members 121 and 131 are heated such that the exhaust gas below 180 deg.c is heated to 180 deg.c.
In the analysis of the gas composition of the exhaust gas, the exhaust gas in the first sampling port 120 was filtered using a 5 μm filter in the first sampling port, and the filter was periodically purged. The filtered tail gas is condensed and dried in the first pretreatment device 240, and further filtered using a 1 μm filter, and the nitrate concentration in the condensed water obtained during the condensation and drying process is detected, and the detection result is corrected according to the nitrate concentration after the detection result is obtained. The tail gas after condensation filtration is diluted by nitrogen provided by a dilution mechanism 230 consisting of 4 nitrogen cylinders with the concentration of 50L and 200MPa and a cylinder switching device, the flow of the undiluted tail gas is continuously monitored in the dilution process, and the flow of the nitrogen is adjusted according to the linear condition of the flow dilution multiple of the tail gas. During the test, the temperature of the first sampling line 210 is heated above the dew point of the acidic solution. The exhaust gas is also filtered using a 0.2 μm filter before entering the gas composition detection apparatus 220. The exhaust gas is detected using the gas component detection device 220, and a gas component analysis result is obtained. After the detection is finished, introducing the tail gas into a downstream sample pipeline, and finally entering a tail gas treatment facility.
When the element content analysis is performed on the tail gas, the tail gas is condensed and dried in the second pretreatment device 330, the dried tail gas enters the second sampling pipeline 310 under the action of the air pump, and the flow rate of the tail gas is calculated through the flow valve arranged in front of the air pump. During the test, the second sampling line 310 is periodically purged and the temperature of the second sampling line 310 is heated above the dew point of the acidic solution. The tail gas is detected by using an X-ray fluorescence spectrometer 320 to obtain an elemental content analysis result. At the detected gap, the tail gas is pumped from the bypass out of the analysis location. After the detection is finished, introducing the tail gas into a downstream sample pipeline, and finally entering a tail gas treatment facility.
In the detection process, mixed gas of NO, NO 2 and N 2 O with concentration of more than 10% is mixed with nitrogen gas to serve as calibration gas, and the gas component detection equipment 220 is directly calibrated without dilution every 24 hours. The X-ray fluorescence spectrometer 320 was calibrated using a standard substance patch every week.
Before the exhaust gas is analyzed, the flow sensor in the X-ray fluorescence spectrometer 320 and the mass flow meter in the gas calibrator of the gas composition detection apparatus 220 are calibrated.
Before the tail gas is analyzed, mixed gas of NO, NO 2 and N 2 O with concentration of more than 10% is mixed with nitrogen to be used as test gas for gas component analysis and test, so that the linearity condition of the dilution ratio can be known.
Before the tail gas is analyzed, the influence of the purge gas on the detection result is obtained by opening and closing the purge gas; by changing the heating temperature of the pipeline, the influence of the temperature on the detection result is obtained. After the detection result is obtained later, the detection result is corrected according to the obtained influence.
If the preheating time of the gas composition detection apparatus 220 is insufficient, it is also necessary to calibrate the gas composition detection apparatus 220; if the X-ray fluorescence spectrometer 320 is disassembled, the X-ray fluorescence spectrometer 320 also needs to be calibrated.
In the above steps, the automatic operation part is controlled by the industrial personal computer. After the analysis result of the gas components and the analysis result of the element content of the tail gas are obtained, the result is further analyzed by the industrial personal computer, the industrial personal computer is utilized to debug the detection equipment, and the parameters of the analyzer are set.
On the basis of the method, equipment of the tail gas analysis system is maintained regularly, and consumable materials of the tail gas analysis system are replaced.
It should also be noted that, in the embodiments of the present application, the features of the embodiments of the present application and the features of the embodiments of the present application may be combined with each other to obtain new embodiments without conflict.
The present application is not limited to the above embodiments, but the scope of the application is defined by the claims.
Claims (11)
1. A tail gas analysis method suitable for analyzing tail gas of a rotary calciner of a cold crucible, comprising the steps of:
S1: a first sampling port and a second sampling port are respectively arranged on the tail gas pipeline of the rotary calciner, and tail gas is obtained through the first sampling port and the second sampling port;
S2: analyzing the tail gas components of the tail gas obtained by the first sampling port;
s3: analyzing the tail gas element content of the tail gas obtained by the second sampling port;
S4: and (3) determining the tail gas composition of the rotary calciner according to the tail gas component obtained in the step S2 and the tail gas element content obtained in the step S3.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
In the step S2 and the step S3, the tail gas is automatically and continuously sampled, and the sampled quantity is recorded in real time.
3. The method of claim 1, wherein the step of determining the position of the substrate comprises,
In step S2, after sampling, it is diluted, and analysis of the tail gas components is performed after dilution.
4. A method according to any one of claim 1 to 3, wherein,
In the steps S2 and S3, the obtained gas sample is kept at a predetermined temperature, and the detection device is periodically purged to avoid clogging of the detection device.
5. A method according to any one of claim 1 to 3, wherein,
In the step S2 and the step S3, the temperature of the pipeline from the exhaust gas acquisition position to the exhaust gas analysis position is kept stable.
6. The method of claim 1, wherein the step of determining the position of the substrate comprises,
In the steps S2 and S3, the tail gas is dried and dedusted before being analyzed.
7. The method of claim 3, wherein the step of,
Diluting the tail gas with nitrogen as a dilution gas, and
A diluting mechanism is formed by a plurality of nitrogen cylinders and a cylinder switching device, so that the diluting gas can be continuously supplied for a predetermined time.
8. The method of claim 4, wherein the step of determining the position of the first electrode is performed,
The predetermined temperature is set above the dew point of the acidic solution.
9. The method of claim 6, wherein the step of providing the first layer comprises,
Obtaining condensate water obtained by removing water from the tail gas, determining the nitrate concentration in the condensate water,
The loss of NO x in the tail gas is corrected based on the determined nitrate concentration.
10. The method of claim 1, wherein the step of determining the position of the substrate comprises,
In the S3 step, the element content in the tail gas is analyzed by adopting a radiation fluorescence spectrum, and the tail gas is pumped from a bypass to an analysis position in a gap of the radiation fluorescence spectrum analysis.
11. The method of claim 1, wherein the step of determining the position of the substrate comprises,
In step S2, the tail gas is filtered in a first filtering mode and a second filtering mode before being analyzed, wherein the granularity of the first filtering mode is larger than that of the second filtering mode.
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