CN215856198U - Device for detecting chlorine content in blast furnace gas - Google Patents
Device for detecting chlorine content in blast furnace gas Download PDFInfo
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- CN215856198U CN215856198U CN202122051654.5U CN202122051654U CN215856198U CN 215856198 U CN215856198 U CN 215856198U CN 202122051654 U CN202122051654 U CN 202122051654U CN 215856198 U CN215856198 U CN 215856198U
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Abstract
The utility model discloses a device for detecting the chlorine content in blast furnace gas, which comprises a blast furnace gas sampling pipeline, a heating unit, a condensing unit and an absorbing unit; the absorption unit comprises a first absorption container and a second absorption container, the first absorption container is used for placing a first absorption liquid which does not absorb or weakly absorbs hydrogen sulfide and carbon dioxide and absorbs chloride, and the second absorption container is used for placing a second absorption liquid which is used for verifying whether the chloride in the blast furnace gas to be detected is completely absorbed by the first absorption liquid. The device is used for detecting the content of chlorine in blast furnace gas, can ensure that the chlorine in the blast furnace gas is fully condensed out and absorbed by solution, eliminates the interference of carbon dioxide on the determination of chloride ions, reduces the measurement error, and improves the lower detection limit and the accuracy.
Description
Technical Field
The utility model relates to the technical field of gas component detection and analysis, in particular to a device for detecting the content of chlorine in blast furnace gas.
Background
Blast furnace gas contains hydrogen chloride (HCl) and ammonium chloride (NH)4Cl), etc. inThe solution of the blast furnace gas is highly corrosive along with the precipitation of condensate in the cooling process of the blast furnace gas, and can bring serious harm to the normal operation of a blast furnace gas pipeline system, a TRT and a hot blast stove. However, the chloride content in the existing blast furnace gas is lack of a standard method, and the chloride concentration is determined by measuring the chloride ion concentration by a wet alkaline solution absorption method. However, because the sampling position of the blast furnace gas is not specified, the blast furnace gas condensation phenomenon exists at the sampling position, and partial chloride is dissolved in condensed water, so that the detection value is smaller or fails; heating measures are not taken in the sampling process, so that the blast furnace gas is condensed on the wall of the sampling pipe to separate out chloride, and the detection value is smaller or fails; the absorption liquid generally adopts sodium hydroxide alkaline solution, and is very easy to react with carbon dioxide (CO) in blast furnace gas while absorbing chloride2) Competition reaction occurs to generate carbonate and bicarbonate, and the carbonate and bicarbonate can interfere with the detection of chloride ions to cause the detection value to be smaller or invalid; the volume ratio of blast furnace gas to be detected and absorption liquid is not considered in the sampling process, so that when the concentration of chloride ions in the absorption liquid is converted into the content of chloride in the blast furnace gas, a coefficient (10-1000) is usually multiplied, and the chloride ions can be accurately measured only by a chloride ion analyzer with higher detection precision and lower detection lower limit.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide an apparatus for detecting the chlorine content in blast furnace gas, which is capable of improving the accuracy and precision of the detection of the chlorine concentration in blast furnace gas.
In order to achieve the above objects and other related objects, the present invention provides an apparatus for detecting chlorine content in blast furnace gas, comprising a blast furnace gas sampling pipe, a heating unit, a condensing unit, and an absorbing unit, which are sequentially communicated; the blast furnace gas sampling pipeline is used for obtaining blast furnace gas to be detected, and the temperature of the blast furnace gas at the sampling position of the blast furnace gas to be detected is kept at 120 ℃ or above; the heating unit is used for heating blast furnace gas to be measured; the condensing unit is used for condensing blast furnace gas to be detected; the absorption unit comprises a plurality of first absorption containers which are sequentially connected in series and a second absorption container which is connected with the last first absorption container in series, wherein first absorption liquid is placed in the first absorption containers, second absorption liquid is placed in the second absorption containers, and the first absorption containers and the second absorption containers are both provided with inlet ends and outlet ends; the first absorption liquid is a solution which absorbs chloride and does not absorb or weakly absorbs hydrogen sulfide and carbon dioxide, and the second absorption liquid is used for verifying whether the chloride in the condensed blast furnace gas to be detected is completely absorbed by the first absorption liquid;
the device further comprises:
the gas flowmeter is used for measuring the volume of the collected blast furnace gas to be measured;
the first pipeline is used for introducing blast furnace gas to be detected into the condensing unit; the blast furnace gas sampling pipeline is connected with the first pipeline through the gas flowmeter;
and the gas thermometer is arranged at the outlet of the condensing unit and used for measuring the temperature of the non-liquefied blast furnace gas to be measured after condensation.
Furthermore, the blast furnace gas sampling pipeline extends into the blast furnace gas main pipe to be detected, the depth of the blast furnace gas main pipe to be detected is 1/4-1/3 of the diameter of the blast furnace gas main pipe to be detected, one end of the blast furnace gas sampling pipeline extending into the blast furnace gas main pipe to be detected is an air taking opening, and the air taking opening is opposite to the flow direction of blast furnace gas.
Furthermore, the blast furnace gas sampling pipeline and the first pipeline are made of high-temperature-resistant materials which do not generate physical and chemical reactions with chlorides in the blast furnace gas, namely the chloride content in the blast furnace gas is not influenced in the sampling process, and the deformation of the blast furnace gas sampling pipeline and the first pipeline at high temperature is avoided; the temperature of blast furnace gas is generally 80-200 ℃, preferably, the blast furnace gas sampling pipeline and the first pipeline are made of materials which do not generate physical and chemical reactions with chloride in the blast furnace gas and can resist the high temperature of 80-200 ℃; more preferably, the material of the blast furnace gas sampling pipe and the first pipeline is polytetrafluoroethylene PTFE or other fluorine-containing polymers, such as fluororesin PFA, ethylene-tetrafluoroethylene copolymer ETFE, ethylene-chlorotrifluoroethylene copolymer ECTFE, polyvinyl fluoride PVF, and the like.
Further, the heating unit is an electric heating resistance wire or a steam coil, and the electric heating resistance wire or the steam coil is sleeved on the first pipeline.
Further, a temperature detection element is arranged on the heating unit and used for detecting the temperature of the blast furnace gas to be detected after heating.
Further, a high-temperature hygrometer is arranged on the heating unit and used for detecting the humidity of the blast furnace gas to be detected.
Further, the condensing unit comprises a condensing pipe, a low-temperature cooling liquid circulating pump and a collecting bottle.
Optionally, the condenser pipe is a straight, spherical or serpentine condenser pipe; preferably, the condensation pipe adopts a serpentine condensation pipe.
Optionally, the cooling liquid of the low-temperature cooling liquid circulating pump is water or an absolute ethyl alcohol solution, the temperature of the cooling liquid is controlled to be-15-5 ℃, and the flow rate of the cooling liquid is controlled to be 0-30L/min, preferably 1-30L/min.
Alternatively, the collection bottle is a two-neck round-bottom flask or other two-neck container.
Further, a second pipeline is arranged between the condensing unit and the absorbing unit and used for introducing the condensed blast furnace gas to be detected into the absorbing unit.
Further, the absorption unit also comprises a plurality of third pipelines, and the third pipelines are used for connecting the adjacent first absorption containers and the second absorption containers in series.
Furthermore, the second pipeline and the third pipeline are made of materials which do not generate physical and/or chemical reaction with chloride in the blast furnace gas to be detected, namely, the content of chlorine in the blast furnace gas to be detected is not influenced in the sampling process; preferably, the material of the second pipeline and the third pipeline is polysulfone, polytetrafluoroethylene PTFE or other fluorine-containing polymer, such as fluororesin PFA, ethylene-tetrafluoroethylene copolymer ETFE, ethylene-chlorotrifluoroethylene copolymer ECTFE, polyvinyl fluoride PVF, etc.
Furthermore, the first absorption container and the second absorption container both adopt impact absorption bottles.
Further, the number of the first absorbing containers is at least 2.
Further, the outlet end of the second absorption container is also connected with an emptying pipe, and the emptying pipe is used for discharging the blast furnace gas to be detected after being treated by the first absorption liquid and the second absorption liquid.
The device further comprises a control unit, wherein the control unit is provided with a control system, and the control system is matched with configuration software and is used for realizing the real-time measurement and recording of the flow, the temperature and the humidity of the blast furnace gas and stabilizing the flow of the blast furnace gas; the gas flowmeter, the gas thermometer and the high-temperature hygrometer are all connected to the control system and are matched with configuration software, so that the real-time measurement and recording of the flow, the temperature and the humidity of the blast furnace gas are realized, and the effect of stabilizing the flow of the blast furnace gas is achieved.
Further, the control unit further comprises a regulating valve arranged on the first pipeline, the regulating valve is used for controlling the flow speed of the blast furnace gas to be measured during sampling, and the regulating valve is connected to the control system and is matched with configuration software to realize the regulation of the flow of the blast furnace gas.
Further, the first absorption liquid is deionized water, and the second absorption liquid is a silver nitrate solution.
Furthermore, the volume of the first absorption liquid is 1/1000-1/10 of the volume of the blast furnace gas to be detected, which is beneficial to reducing the measurement error and improving the lower detection limit; preferably, the volume of the first absorption liquid is 1/1000 of the volume of the blast furnace gas to be measured.
As described above, the apparatus for detecting the chlorine content in blast furnace gas according to the present invention has the following advantageous effects:
the device for detecting the content of chlorine in the blast furnace gas is provided with a sampling unit, a heating unit, a condensing unit and an absorbing unit, when the device is used for detecting the content of chlorine in the blast furnace gas, a method of gas heating, condensing and absorbing can be adopted to quickly condense and fully absorb the blast furnace gas, ensure that chlorides in the blast furnace gas are completely collected, eliminate the interference of carbon dioxide on the determination of chloride ions, and accurately calculate the concentration of the chloride ions in the blast furnace gas in unit volume by combining with a chloride ion analysis method through a formula. The device has a strict structure, the temperature of the blast furnace gas is kept at 120 ℃ or above through the arrangement of the sampling unit and the heating unit, the phenomenon of blast furnace gas condensation does not exist, the detection error caused by the condensation of a blast furnace gas pipeline is avoided, and the accuracy of the detection result of the chlorine content in the blast furnace gas is improved.
Drawings
FIG. 1 is a schematic structural view of the apparatus for detecting chlorine content in blast furnace gas of the present invention.
Description of reference numerals: 1-blast furnace gas sampling pipeline, 2-gas flowmeter, 3-heating unit, 4-first pipeline, 5-condenser pipe, 6-low-temperature cooling liquid circulating pump, 7-collecting bottle, 8-gas thermometer, 9-absorption unit, 91-first absorption container, 911-first absorption bottle, 912-second absorption bottle, 92-second absorption container, 10-second pipeline, 11-third pipeline and 12-emptying pipe.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
As shown in fig. 1, the present invention provides a device for detecting the chlorine content in blast furnace gas, which comprises a blast furnace gas sampling pipeline 1, a heating unit 3, a condensing unit and an absorbing unit 9, which are sequentially communicated, and the specific structure is as follows:
the blast furnace gas sampling pipeline 1 is used for obtaining blast furnace gas to be detected, and the temperature of the blast furnace gas at the sampling position of the blast furnace gas to be detected is kept at 120 ℃ or above; specifically, the blast furnace gas sampling pipeline 1 extends into a blast furnace gas main pipe to be detected, the depth of the blast furnace gas main pipe to be detected is 1/4-1/3 of the diameter of the blast furnace gas main pipe to be detected, one end of the blast furnace gas sampling pipeline extending into the blast furnace gas main pipe to be detected is an air taking port, and the air taking port is opposite to the flow direction of blast furnace gas.
It should be noted that the blast furnace gas sampling pipe 1 is made of a material which does not produce physical and chemical reactions with chloride in the blast furnace gas and is high-temperature resistant, i.e. the content of chloride in the blast furnace gas is not affected in the sampling process, and the deformation of the blast furnace gas sampling pipe 1 at high temperature is avoided; the temperature of blast furnace gas is generally 80-200 ℃, and preferably, the blast furnace gas sampling pipeline is made of a material which does not generate physical and chemical reactions with chlorides in the blast furnace gas and can resist the high temperature of 80-200 ℃; more preferably, the material of the blast furnace gas sampling pipe 1 is polytetrafluoroethylene PTFE or other fluorine-containing polymer, such as fluororesin PFA, ethylene-tetrafluoroethylene copolymer ETFE, ethylene-chlorotrifluoroethylene copolymer ECTFE, polyvinyl fluoride PVF, and the like.
And the gas flowmeter 2 is used for measuring the volume of the collected blast furnace gas to be measured.
The first pipeline 4 is used for introducing blast furnace gas to be detected into the condensing unit; the blast furnace gas sampling pipe 1 is connected with a first pipeline 4 through a gas flowmeter 2.
It should be noted that the first pipeline 4 is made of a material which does not react with chloride in the blast furnace gas to be detected physically and/or chemically and is resistant to high temperature, that is, the content of chlorine in the blast furnace gas to be detected is not affected in the sampling process, and meanwhile, the first pipeline 4 is prevented from deforming at high temperature; the temperature of blast furnace gas is generally 80-200 ℃, and preferably, the blast furnace gas sampling pipeline is made of a material which does not generate physical and chemical reactions with chlorides in the blast furnace gas and can resist the high temperature of 80-200 ℃; more preferably, the material of the first pipeline 4 is polytetrafluoroethylene PTFE or other fluorine-containing polymer, such as fluororesin PFA, ethylene-tetrafluoroethylene copolymer ETFE, ethylene-chlorotrifluoroethylene copolymer ECTFE, polyvinyl fluoride PVF, etc.
The heating unit 3 is used for heating blast furnace gas to be measured; the heating unit 3 is an electric heating resistance wire or a steam coil, and the electric heating resistance wire or the steam coil is sleeved on the first pipeline 4. The heating unit 3 is provided with a temperature detection element for detecting the temperature of the blast furnace gas to be detected after heating. And the heating unit 3 is also provided with a high-temperature hygrometer for detecting the humidity of the blast furnace gas to be detected.
The condensation unit is used for condensing blast furnace gas to be detected; the condensing unit includes condenser pipe 5, cryogenic cooling liquid circulating pump 6, receiving flask 7, and the upper end of condenser pipe 5 is linked together with first pipeline 4, and the lower extreme and the receiving flask 7 of condenser pipe 5 are linked together, and cryogenic cooling liquid circulating pump 6 is linked together through the inlet outlet of pipeline with condenser pipe 5. Wherein, the condensing pipe 5 adopts a straight, spherical or serpentine condensing pipe, preferably a serpentine condensing pipe; the cooling liquid of the low-temperature cooling liquid circulating pump 6 adopts water or absolute ethyl alcohol solution, the temperature of the cooling liquid is controlled to be-15-5 ℃, and the flow rate of the cooling liquid is controlled to be 0-30L/min; the collection bottle 7 adopts a double-mouth round-bottom flask or other double-mouth containers.
The absorption unit 9 comprises a plurality of first absorption containers 91 sequentially connected in series and a second absorption container 92 connected in series with the last first absorption container 91, the first absorption container 91 and the second absorption container 92 are both provided with an inlet end and an outlet end, and the first absorption container 91 and the second absorption container 92 can both adopt impact absorption bottles; in order to ensure that chlorine in the blast furnace gas is completely absorbed by the first absorption liquid, at least 2 first absorption containers 91 are provided, such as a first absorption bottle 911 and a second absorption bottle 912 shown in fig. 1. The first absorption container 91 contains the first absorption liquid, and the second absorption container 92 contains the second absorption liquid. The first absorption liquid is a solution which absorbs chloride and does not absorb or weakly absorbs hydrogen sulfide and carbon dioxide, and the second absorption liquid is used for verifying whether the chloride in the condensed blast furnace gas to be detected is completely absorbed by the first absorption liquid. Specifically, the first absorption liquid can adopt deionized water, and the second absorption liquid can adopt a silver nitrate solution; the volume of the first absorption liquid is 1/1000-1/10 of the volume of the blast furnace gas to be detected, preferably 1/1000, and the first absorption liquid is beneficial to reducing measurement errors and improving the lower detection limit; the third absorption liquid is an alkaline solution or an aqueous solution for absorbing chloride.
Specifically, the absorption unit 9 further includes a plurality of third pipelines 11, and the third pipelines 11 connect adjacent first absorption containers 91 and second absorption containers 92 in series. It should be noted that the third pipeline 11 is made of a material that does not react with the chloride in the blast furnace gas to be measured physically and/or chemically, i.e. the content of chlorine in the blast furnace gas to be measured is not affected during the sampling process; preferably, the material of the third pipeline 11 is polysulfone, polytetrafluoroethylene PTFE or other fluorine-containing polymer, such as fluororesin PFA, ethylene-tetrafluoroethylene copolymer ETFE, ethylene-chlorotrifluoroethylene copolymer ECTFE, polyvinyl fluoride PVF, etc.
In addition, this detection device still includes:
and the second pipeline 10 is arranged between the condensing unit and the absorption unit 9 and is used for introducing the blast furnace gas to be detected which is not liquefied after condensation into the absorption unit 9. Specifically, one end of the second pipeline 10 is communicated with the collecting bottle 7, and the other end is communicated with the inlet end of the absorption bottle I911.
It should be noted that the second pipeline 10 is made of a material that does not react with the chloride in the blast furnace gas to be measured physically and/or chemically, i.e. the content of chlorine in the blast furnace gas to be measured is not affected during the sampling process; preferably, the material of the second pipeline 10 is polysulfone, polytetrafluoroethylene PTFE or other fluorine-containing polymer, such as fluororesin PFA, ethylene-tetrafluoroethylene copolymer ETFE, ethylene-chlorotrifluoroethylene copolymer ECTFE, polyvinyl fluoride PVF, etc.
And the gas thermometer 8 is arranged at the outlet of the condensing unit and is used for measuring the temperature of the to-be-measured blast furnace gas which is not liquefied after condensation. Specifically, the gas thermometer 8 is installed on the second pipe 10.
And the emptying pipe 13 is connected to the outlet end of the second absorption container 92 and is used for discharging the blast furnace gas to be measured after being treated by the first absorption liquid and the second absorption liquid.
The control unit is provided with a control system which is matched with configuration software and is used for realizing the real-time measurement and recording of the flow, the temperature and the humidity of the blast furnace gas and stabilizing the flow of the blast furnace gas; the gas flowmeter 2, the gas thermometer 8 and the high-temperature hygrometer are all connected to the control system and are matched with configuration software, so that the real-time measurement and recording of the flow, the temperature and the humidity of the blast furnace gas are realized, and the effect of stabilizing the flow of the blast furnace gas is achieved.
In addition, the control unit further comprises a regulating valve arranged on the first pipeline 4, the regulating valve is used for controlling the flow speed of the blast furnace gas to be measured during sampling, and the regulating valve is connected to the control system and matched with configuration software to realize the regulation of the flow of the blast furnace gas.
It should be noted that, in the detecting device of the present invention, all the pipes, pipelines and chemical instruments are connected in a sealing manner to avoid the leakage of the blast furnace gas to be detected during the circulation process, which is common knowledge of those skilled in the art, and therefore, the structural description of the device is not specifically described.
The detection device provided by the utility model is adopted to detect the chlorine content of the blast furnace gas as follows:
1) determining a blast furnace gas sampling position, wherein the temperature of the blast furnace gas at the sampling position is kept at 120 ℃ or above, and the phenomenon of blast furnace gas condensation does not exist;
2) the blast furnace gas to be detected is introduced into the detection device from the blast furnace gas sampling position through the pipeline, and is heated at the same time, so that the temperature of the blast furnace gas to be detected is kept at 120 ℃ or above, and the blast furnace gas to be detected is prevented from entering the pipeline and then being condensed;
3) condensing the heated blast furnace gas to be measured to ensure that the blast furnace gas to be measured is fully condensed to the ambient temperature, and condensing part of the blast furnace gas to be measured into condensate;
4) sequentially introducing the blast furnace gas to be detected which is not liquefied after condensation into a first absorption liquid and a second absorption liquid, and fully reacting the blast furnace gas to be detected after condensation with the first absorption liquid to obtain a first reaction liquid; the first absorption liquid is a solution which absorbs chloride and does not absorb or weakly absorbs hydrogen sulfide and carbon dioxide, and the second absorption liquid is used for verifying whether the chloride in the condensed blast furnace gas to be detected is completely absorbed by the first absorption liquid;
5) after sampling is finished, fully washing pipelines and chemical instruments (including the first pipeline 4, the condensation pipe 5, the collection bottle 7, the second pipeline 10 and the third pipeline 11) through which blast furnace gas to be detected passes by using third absorption liquid (at least three times), and obtaining washing liquid;
6) sequentially detecting the content of chloride ions in the condensate obtained in the step 3), the content of chloride ions in the first reaction liquid obtained in the step 4) and the content of chloride ions in the washing liquid obtained in the step 5) by adopting a chloride ion analysis method, and calculating to obtain the content C of chloride ions in the blast furnace gas to be detected through a formula, wherein the unit is mg/L, and the calculation formula is as follows:
C＝(Vcondensate liquid×CCondensate liquid+VFirst reaction solution×CFirst reaction solution+VCleaning solution×CCleaning solution)÷VTo be measured；
Wherein C is the content of chloride ions in the blast furnace gas, VCondensate liquidVolume of condensate, VFirst reaction solutionVolume of the first reaction solution, VCleaning solutionIs the volume of the washing solution, VTo be measuredTo measure the volume of blast furnace gas, CCondensate liquidAs content of chloride ions in the condensate, CFirst reaction solutionIs the content of chloride ions in the first reaction solution, CCleaning solutionThe content of chloride ions in the washing solution.
Further, in the step 4), the first absorption liquid is deionized water, and the second absorption liquid is a silver nitrate solution.
Further, in the step 4), the volume of the first absorption liquid is 1/1000-1/10 of the volume of the blast furnace gas to be detected, which is beneficial to reducing the measurement error and improving the lower detection limit; preferably, the volume of the first absorption liquid is 1/1000 of the volume of the blast furnace gas to be measured.
Further, in the step 5), the third absorption liquid is an alkaline solution or an aqueous solution for absorbing chloride; preferably, the third absorption liquid is deionized water.
Further, in step 6), the chloride ion analysis method comprises one and/or more of ion chromatography, potentiometric titration, molarity, mercury salt titration, mercury thiocyanate spectrophotometry and coprecipitation enrichment spectrophotometry; preferably, the chloride ion analysis method is ion chromatography.
It should be noted that, in the detection process, the blast furnace gas to be detected must be introduced into the first absorption liquid first and then into the second absorption liquid, otherwise, the sampling fails.
The method for detecting the content of chlorine in the blast furnace gas has the following advantages:
1. the mode of 'gas heating + condensation + absorption' is adopted, so that not only is the chlorides in the blast furnace gas fully condensed and separated out and are absorbed by the solution ensured, but also the interference of carbon dioxide on the determination of chloride ions is eliminated, meanwhile, the measurement error is reduced, and the lower limit of the detection is improved.
2. The sampling position of the blast furnace gas to be measured is described in detail, the temperature of the blast furnace gas at the sampling position is kept at 120 ℃ or above, the phenomenon of blast furnace gas condensation does not exist, the actual chlorine content in the blast furnace gas can be accurately represented, and the detection error caused by the condensation of a blast furnace gas pipeline is avoided.
3. The detected chlorine content comprises gaseous chlorine content and dust chlorine content, the defect that the existing detection method can only detect the gas-phase chlorine content is overcome, and the actual chlorine content in the blast furnace gas can be accurately detected. The method for detecting the chlorine content of the blast furnace gas by using the detection device is described below by specific examples.
Example 1
When sampling is prepared, a blast furnace gas main pipe with the temperature of 120 ℃ and above and no condensed water is screened out to be used as a sampling position; placing a blast furnace gas sampling pipeline 1 into a blast furnace gas main pipe to be measured, wherein the depth of the blast furnace gas sampling pipeline is 1/3 of the diameter of the blast furnace gas main pipe to be measured, an air taking port and the flow direction of blast furnace gas are in opposite directions, diffusing the blast furnace gas through the blast furnace gas sampling pipeline 1 for 30min, and opening a heating unit 3 to preheat a first pipeline 4 during the period to ensure that the temperature of internal gas is above 120 ℃; a serpentine condenser pipe is adopted, a low-temperature cooling liquid circulating pump is started, the cooling liquid of the low-temperature cooling liquid circulating pump is absolute ethyl alcohol solution, the temperature of the cooling liquid is controlled to be-15 ℃, and the flow rate of the cooling liquid is controlled to be 30L/min.
After the preparation of the steps is finished, sampling is started, a blast furnace gas sampling pipeline 1 is connected with a first pipeline 4 through a gas flowmeter 2, the flow of blast furnace gas to be tested is controlled to be 1L/min through the gas flowmeter 2, and the testing time is 30 min; the first absorption container 91 adopts an impact type absorption bottle for two-stage absorption, and the first absorption liquid adopts deionized water with the volume of 30 mL; the second absorption container 92 also adopts an impact absorption bottle, and the second absorption liquid adopts a silver nitrate solution with the volume of 50 mL. In the testing process, the flow of the blast furnace gas to be tested is kept at 1L/min, the temperature is kept at 120 ℃ or above, the reading of the gas thermometer 8 is kept consistent with the ambient temperature, and otherwise, the sampling fails. And stopping sampling when the sampling time reaches 30min, collecting the condensate, the first reaction liquid and the washing liquid, measuring the volume of the corresponding solution and the concentration of chloride ions, accurately calculating the concentration of the chloride ions in the blast furnace gas in unit volume through a formula, and finishing the test.
In order to ensure the reliability of experimental data, at least 3 groups of data are required to be measured at the same sampling position;
in order to ensure the reliability of experimental data, the analysis of the concentrations of the chloride ions in the condensate, the first reaction liquid and the washing liquid is required to be carried out within 24 hours after the sampling is finished, and if the analysis cannot be finished, the condensate, the first reaction liquid and the washing liquid are stored at 0 ℃ and are analyzed as soon as possible.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the utility model. It will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims.
Claims (10)
1. A device for detecting the content of chlorine in blast furnace gas is characterized by comprising a blast furnace gas sampling pipeline, a heating unit, a condensing unit and an absorbing unit which are sequentially communicated; the blast furnace gas sampling pipeline is used for acquiring blast furnace gas to be detected; the heating unit is used for heating blast furnace gas to be measured, and the temperature of the blast furnace gas at the sampling position of the blast furnace gas to be measured is kept at 120 ℃ or above; the condensing unit is used for condensing blast furnace gas to be detected; the absorption unit comprises a plurality of first absorption containers which are sequentially connected in series and a second absorption container which is connected with the last first absorption container in series, wherein first absorption liquid is placed in the first absorption containers, second absorption liquid is placed in the second absorption containers, and the first absorption containers and the second absorption containers are both provided with inlet ends and outlet ends; the first absorption liquid is a solution which absorbs chloride and does not absorb or weakly absorbs hydrogen sulfide and carbon dioxide, and the second absorption liquid is used for verifying whether the chloride in the condensed blast furnace gas to be detected is completely absorbed by the first absorption liquid; the device further comprises:
the gas flowmeter is used for measuring the volume of the collected blast furnace gas to be measured;
the first pipeline is used for introducing blast furnace gas to be detected into the condensing unit; the blast furnace gas sampling pipeline is connected with the first pipeline through the gas flowmeter;
and the gas thermometer is arranged at the outlet of the condensing unit and used for measuring the temperature of the non-liquefied blast furnace gas to be measured after condensation.
2. The apparatus of claim 1, wherein: the blast furnace gas sampling pipeline extends into a blast furnace gas main pipe to be detected, the depth of the blast furnace gas main pipe to be detected is 1/4-1/3 of the diameter of the blast furnace gas main pipe to be detected, one end of the blast furnace gas sampling pipeline extending into the blast furnace gas main pipe to be detected is an air taking opening, and the air taking opening is opposite to the flow direction of blast furnace gas;
and/or the blast furnace gas sampling pipeline and the first pipeline are made of high-temperature resistant materials which do not generate physical and chemical reactions with chlorides in the blast furnace gas.
3. The apparatus of claim 2, wherein: the blast furnace gas sampling pipeline and the first pipeline are made of polytetrafluoroethylene.
4. The apparatus of claim 1, wherein: the heating unit is an electric heating resistance wire or a steam coil pipe, and the electric heating resistance wire or the steam coil pipe is sleeved on the first pipeline;
and/or a temperature detection element is arranged on the heating unit and is used for detecting the temperature of the blast furnace gas to be detected after heating;
and/or a high-temperature hygrometer is arranged on the heating unit and used for detecting the humidity of the blast furnace gas to be detected.
5. The apparatus of claim 1, wherein: at least 2 first absorbing containers;
and/or the outlet end of the second absorption container is also connected with an emptying pipe, and the emptying pipe is used for discharging the blast furnace gas to be detected after being treated by the first absorption liquid and the second absorption liquid.
6. The apparatus of claim 1, wherein: the condensing unit comprises a condensing pipe, a low-temperature cooling liquid circulating pump and a collecting bottle;
and/or a second pipeline is arranged between the condensing unit and the absorbing unit and is used for introducing the condensed blast furnace gas to be detected into the absorbing unit;
and/or the absorption unit further comprises a plurality of third pipelines, and the third pipelines are used for connecting the adjacent first absorption containers and the second absorption containers in series;
and/or the first absorption container and the second absorption container are impact absorption bottles.
7. The apparatus of claim 6, wherein: the condenser pipe adopts a straight, spherical or snake-shaped condenser pipe;
and/or the cooling liquid of the low-temperature cooling liquid circulating pump adopts water or absolute ethyl alcohol solution, the temperature of the cooling liquid is controlled to be-15-5 ℃, and the flow rate of the cooling liquid is controlled to be 0-30L/min;
and/or the collecting bottle adopts a double-mouth round-bottom flask or other double-mouth containers;
and/or the second pipeline and the third pipeline are made of materials which do not generate physical and/or chemical reaction with chloride in the blast furnace gas to be detected.
8. The apparatus of claim 1, wherein: the device also comprises a control unit, wherein the control unit is provided with a control system, and the control system is matched with configuration software and is used for realizing the real-time measurement and recording of the flow, the temperature and the humidity of the blast furnace gas and stabilizing the flow of the blast furnace gas; the gas flowmeter, the gas thermometer and the high-temperature hygrometer are all connected to the control system and are matched with configuration software.
9. The apparatus of claim 8, wherein: the control unit further comprises a regulating valve arranged on the first pipeline, the regulating valve is used for controlling the flow rate of the blast furnace gas to be measured during sampling, and the regulating valve is connected to the control system and matched with configuration software.
10. The apparatus of claim 1, wherein: the first absorption liquid is deionized water, and the second absorption liquid is a silver nitrate solution;
the volume of the first absorption liquid is 1/1000-1/10 of the volume of the blast furnace gas to be measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122051654.5U CN215856198U (en) | 2021-08-27 | 2021-08-27 | Device for detecting chlorine content in blast furnace gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122051654.5U CN215856198U (en) | 2021-08-27 | 2021-08-27 | Device for detecting chlorine content in blast furnace gas |
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| CN202122051654.5U Active CN215856198U (en) | 2021-08-27 | 2021-08-27 | Device for detecting chlorine content in blast furnace gas |
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