CN111750625A - Nitrogen-introducing drying method and device for sample drying - Google Patents
Nitrogen-introducing drying method and device for sample drying Download PDFInfo
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- CN111750625A CN111750625A CN201910232116.0A CN201910232116A CN111750625A CN 111750625 A CN111750625 A CN 111750625A CN 201910232116 A CN201910232116 A CN 201910232116A CN 111750625 A CN111750625 A CN 111750625A
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- 238000001035 drying Methods 0.000 title claims abstract description 202
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 393
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 177
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 238000004064 recycling Methods 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 72
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 39
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims 1
- 125000004122 cyclic group Chemical group 0.000 abstract description 5
- 239000003245 coal Substances 0.000 description 13
- 230000006872 improvement Effects 0.000 description 13
- 238000002474 experimental method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 239000002699 waste material Substances 0.000 description 4
- 238000007605 air drying Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
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Abstract
The invention discloses a nitrogen-introducing drying method for sample drying, which comprises the steps of introducing nitrogen into a drying oven to dry a sample, and pumping out the nitrogen in the drying oven; detecting the moisture content of the nitrogen; and judging whether the moisture content of the nitrogen is greater than or equal to a set value, if so, directly discharging the nitrogen, and if not, entering the next step. And introducing the pumped nitrogen into the drying oven again to realize the recycling of the nitrogen. According to the method, the moisture content of the nitrogen is detected, and the nitrogen with the moisture content meeting the requirement is introduced into the drying oven again, so that the cyclic utilization of the nitrogen is realized, the use amount of the nitrogen is reduced, the cost is saved, and the drying efficiency is improved. The invention also discloses a nitrogen-introducing drying device for sample drying, which can realize the method, save the use amount of nitrogen by recycling nitrogen and integrally improve the working efficiency of nitrogen-introducing drying.
Description
Technical Field
The invention mainly relates to the technical field of sample detection, in particular to a nitrogen-introducing drying method and a nitrogen-introducing drying device for sample drying.
Background
In the technical field of sample detection, a sample which is easy to oxidize often needs to be dried by introducing nitrogen so as to ensure that the sample does not have oxidation reaction to influence a test result. Taking a coal sample as an example, the moisture content of the coal sample is an important index for the valuation of commercial coal, and therefore, in the preparation and experiment processes of the coal sample, the moisture content of the coal sample needs to be measured, and the detection process needs to dry the coal sample.
The existing coal sample drying method mainly comprises an air drying method and a nitrogen introducing drying method. In the case of coal having oxidizing properties such as brown coal, air drying is likely to oxidize the coal sample, and results of the test are inaccurate.
In the existing nitrogen-introducing drying method, firstly, nitrogen is introduced into a drying box to pre-exhaust air in the drying box, so that the coal sample is prevented from being oxidized by the air; then heating the drying box to a specified temperature, and continuously introducing nitrogen to dry the coal sample; when the air exchange is required at regular time during the drying process, the air exchange is performed in a manner of exhausting the air in the drying oven while introducing nitrogen. However, nitrogen gas is also discharged in the process of discharging the gas in the drying oven, so that waste of nitrogen gas is caused, the experiment cost is increased, a large amount of heat is also taken away by the nitrogen gas, and the newly-entered nitrogen gas also needs to be reheated, so that the overall efficiency of nitrogen introducing drying is greatly reduced.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the nitrogen-introducing drying method for sample drying, which has the advantages of cyclic utilization of nitrogen gas, lower energy consumption and higher drying efficiency.
Another object of the present invention is to provide a nitrogen-introducing drying apparatus for sample drying which realizes the above method.
In order to solve the technical problems, the invention adopts the following technical scheme:
the nitrogen-introducing drying method for drying the sample, which is to introduce nitrogen into a drying oven to dry the sample, comprises the following steps:
s1: pumping out nitrogen in the drying box;
s2: detecting the moisture content of the nitrogen;
s3: judging whether the moisture content of the nitrogen is greater than or equal to a set value, if so, directly discharging the nitrogen, and if not, entering the next step;
s4: and introducing the pumped nitrogen into the drying oven again to realize the recycling of the nitrogen.
As a further improvement of the invention: the specific steps of step S3 are:
s301: judging whether the moisture content of the nitrogen is greater than or equal to a set value, if so, directly discharging the nitrogen and supplementing new nitrogen; if not, go to the next step.
As a further improvement of the invention: the step S1 is preceded by the steps of:
s01: introducing nitrogen into the drying box to exhaust original air;
s02: detecting and judging whether the concentration value of the nitrogen is lower than a set value, if so, continuing to introduce the nitrogen; if not, entering the next step;
s03: the nitrogen gas was stopped and the sample was allowed to dry.
As a further improvement of the invention: the step S1 is preceded by the steps of:
s011: introducing nitrogen into the drying box to exhaust original air;
s021: after the preset time, the nitrogen gas introduction is stopped, and the sample is dried.
As a further improvement of the invention: the step S01 is preceded by: the temperature in the drying box is controlled to be kept within the range required for carrying out the drying reaction.
As a further improvement of the invention: before the step S011, the method further includes: the temperature in the drying box is controlled to be kept within the range required for carrying out the drying reaction.
The invention also correspondingly discloses a nitrogen-introducing drying device for drying a sample, which comprises a drying box, wherein the drying box is provided with an air inlet and an air outlet, the air inlet and the air outlet are communicated through a pipeline, the pipeline is provided with an air outlet, the air outlet is provided with an exhaust valve for controlling air to be exhausted, the pipeline close to the air inlet is provided with a nitrogen interface, the nitrogen interface is provided with a nitrogen control valve, the pipeline is communicated with a nitrogen source through the nitrogen control valve, the pipeline is provided with an air pump for pumping the air in the drying box, and the pipeline is provided with a gas humidity testing device for detecting the moisture content of the nitrogen.
As a further improvement of the invention: the pipeline is provided with a control valve for controlling the opening and closing of the circulating gas circuit.
As a further improvement of the invention: and the pipeline is provided with a water removal filter for removing water in the flowing gas in the pipeline.
As a further improvement of the invention: and the pipeline is provided with a nitrogen concentration detection device for detecting the concentration of nitrogen in the circulating gas circuit.
As a further improvement of the invention: and the pipeline is provided with a flow detection device for detecting the gas flow in the circulating gas circuit.
As a further improvement of the invention: and the pipeline is provided with a speed regulating device for regulating the flow speed of gas in the circulating gas circuit.
As a further improvement of the invention: the air pump is a variable air pump capable of adjusting the air flow rate in the circulating air path.
As a further improvement of the invention: the drying cabinet is internally provided with a heater for heating the drying cabinet, a temperature sensor for measuring the temperature in the drying cabinet and a control panel connected with the heater and the temperature sensor.
As a further improvement of the invention: and a stirring fan used for uniformly mixing nitrogen in the drying oven is arranged in the drying oven.
Compared with the prior art, the invention has the advantages that:
1. the nitrogen-introducing drying method for drying the sample provided by the invention is characterized in that in the process of drying the sample by using nitrogen, the nitrogen is extracted, the moisture content of the extracted nitrogen is detected and judged, and when the moisture content of the nitrogen is larger than or equal to a set value and cannot be directly reused, the moisture-containing nitrogen is discharged; when the water content of the nitrogen is less than the set value and can be directly reused, the nitrogen is introduced into the drying oven again, so that the cyclic utilization of the nitrogen is realized, the use amount of the nitrogen can be greatly reduced, the utilization rate of the nitrogen is improved, and the cost is saved; in addition, when the next sample is dried by introducing nitrogen, the nitrogen is still kept at a certain temperature after being extracted and is filled into the drying box again, so that the heating time of the nitrogen is shortened.
2. According to the nitrogen-introducing drying method for sample drying, provided by the invention, nitrogen is introduced into the drying oven before sample drying for discharging air in the drying oven, and whether the nitrogen is continuously introduced or the nitrogen introduction is stopped is determined by detecting the concentration of the nitrogen, so that the accurate control of the nitrogen introduction amount is realized, the waste of the nitrogen can be avoided, the nitrogen usage amount is reduced, and the cost is saved.
3. The invention provides a nitrogen-introducing drying device for sample drying, which comprises a gas inlet and a gas outlet, wherein the gas inlet and the gas outlet are communicated through a pipeline, nitrogen is pumped out through a gas pump, the device is provided with a gas humidity testing device for detecting the moisture content of the nitrogen, the moisture content of the nitrogen is tested through the gas humidity testing device, and the nitrogen is discharged when the moisture value of the nitrogen is greater than or equal to a set value; when the moisture value of the nitrogen is smaller than the set value, the nitrogen is refilled into the drying box, so that the cyclic utilization of the nitrogen can be realized; the nitrogen with the moisture content meeting the requirement is recycled, so that the using amount of the nitrogen can be greatly reduced, the utilization rate of the nitrogen is improved, and the cost is saved; in addition, when the next sample is dried by introducing nitrogen, the nitrogen is still kept at a certain temperature after being pumped out and is charged into the drying box again, so that the heating time of the nitrogen is shortened, and the overall working efficiency is improved.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Fig. 3 is a schematic view showing a state in which gas flows inside the drying cabinet when the stirrer fan of the present invention is turned on.
Fig. 4 is a schematic view showing a state in which gas flows inside the drying cabinet when the stirrer fan of the present invention is turned off.
Illustration of the drawings:
100. a drying oven; 101. an air inlet; 102. an air outlet; 1. an exhaust valve; 2. a nitrogen control valve; 3. an air pump; 4. a gas humidity testing device; 5. a control valve; 6. a nitrogen concentration detection device; 7. a flow detection device; 8. a speed regulating device; 9. a stirring fan.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples.
As shown in fig. 1, the method for drying a sample by introducing nitrogen gas into a drying oven to dry the sample provided in this embodiment includes the following steps:
s1: the nitrogen in the drying oven 100 is pumped out;
s2: detecting the moisture content of the nitrogen;
s3: and judging whether the moisture content of the nitrogen is greater than or equal to a set value, if so, directly discharging the nitrogen, and if not, entering the next step.
S4: the extracted nitrogen is introduced into the drying oven 100 again to realize the recycling of the nitrogen.
The nitrogen-introducing drying method for drying the sample provided by the invention is characterized in that in the process of drying the sample by using nitrogen, the nitrogen is extracted, the moisture content of the extracted nitrogen is detected and judged, and when the moisture content of the nitrogen is larger than or equal to a set value and cannot be directly reused, the moisture-containing nitrogen is discharged; when the moisture content of the nitrogen is less than the set value and can be directly reused, the nitrogen is introduced into the drying box 100 again, and in practical application, as the gas is heated to 105-110 ℃ in the drying box 100 and the heated air takes away most of moisture in the circulating gas path, only a small part of the nitrogen needs to be discharged, and most of the nitrogen can be recycled, so that the use amount of the nitrogen is greatly reduced, the utilization rate of the nitrogen is improved, and the cost is saved; in addition, when the next sample is dried by introducing nitrogen, the nitrogen is still kept at a certain temperature after being extracted and is charged into the drying oven 100 again, so that the heating time of the nitrogen is shortened.
Further, in a preferred embodiment, the specific steps of step S3 are:
s301: judging whether the moisture content of the nitrogen is greater than or equal to a set value, if so, directly discharging the nitrogen and supplementing new nitrogen; if not, go to the next step.
After the nitrogen with the unsatisfactory moisture content is discharged, new nitrogen is supplemented, so that the dry air is filled with nitrogen to ensure that the experimental result of the sample is not influenced.
In this embodiment, before the sample is dried, the method further includes the following steps:
s01: introducing nitrogen into the drying oven 100 to exhaust the original air;
s02: detecting and judging whether the concentration value of the nitrogen is lower than a set value, if so, continuing to introduce the nitrogen; if not, entering the next step;
s03: the nitrogen gas was stopped and the sample was allowed to dry.
Before drying the sample, nitrogen is introduced into the drying oven 100 to pre-exhaust the air in the drying oven 100, so that the sample is prevented from being oxidized by the air, and an experimental result is inaccurate.
The nitrogen is introduced into the drying oven 100 to fill the whole drying oven 100 with nitrogen, and the concentration value of the nitrogen is detected to determine whether the concentration of the nitrogen meets the set value required by the experiment, so as to ensure that the sample is not oxidized by air and the accuracy of the result.
The nitrogen-introducing drying method for drying the sample provided by the invention is characterized in that after nitrogen is introduced into the drying box 100, the concentration value of the nitrogen is detected, if the concentration value of the nitrogen meets the set value required by the experiment, the introduction of the nitrogen can be stopped, the use amount of the nitrogen can be controlled more accurately by the method, the cyclic utilization of the nitrogen is realized by the introduced nitrogen through the steps S1 to S4, the waste of the nitrogen is reduced, and the cost is saved. In other embodiments, the following steps may be also adopted to pre-exhaust the air inside the drying oven 100 before the sample is dried:
s011: introducing nitrogen into the drying oven 100 to exhaust the original air;
s021: after the preset time, the nitrogen gas introduction is stopped, and the sample is dried.
Taking a coal sample as an example, the preset time is determined according to the requirements of national standards, the drying oven 100 needs to be ventilated regularly according to the requirements of the national standards, the ventilation frequency required by the national standards is more than 15 times per hour, the actual experiment can be carried out according to the requirements of the national standards, the preset time for ventilation is determined accordingly, and after the preset time is reached, the nitrogen gas is stopped to be introduced into the drying oven 100. It can be understood that, after the above steps are completed, the foregoing steps S1 to S4 can be also adopted to realize the recycling of nitrogen, thereby reducing the waste of nitrogen and saving the cost. In other embodiments, the nitrogen-introducing drying method for sample drying provided by the invention can be used for drying easily-oxidized samples such as biomass, solid waste or solid garbage, and the like.
In order to ensure the temperature requirement for drying the sample, in a preferred embodiment, before the nitrogen gas is introduced into the drying oven 100 to dry the sample, the following steps are further included:
the temperature in the drying oven 100 is controlled to be maintained within a desired range for performing the drying reaction. Taking a coal sample as an example, the temperature range for carrying out nitrogen drying reaction is 105-110 ℃ according to the national standard requirement.
As shown in fig. 2 to 4, this embodiment provides a nitrogen-introducing drying device for sample drying in addition to the above-described nitrogen-introducing drying method for sample drying.
The nitrogen-introducing drying device for drying samples, which is provided by the embodiment, comprises a drying oven 100, an air inlet 101 and an air outlet 102 have been seted up to drying oven 100, air inlet 101 and air outlet 102 pass through the pipeline intercommunication, be equipped with the gas vent on the pipeline, gas vent department is equipped with and is used for controlling air exhaust's discharge valve 1, is close to air inlet 101 be equipped with the nitrogen gas interface on the pipeline, the nitrogen gas interface is equipped with nitrogen gas control valve 2, the nitrogen gas interface passes through nitrogen gas control valve 2 intercommunication nitrogen gas source, be equipped with on the pipeline and be used for taking out the air pump 3 of gas in drying oven 100, be equipped with the gas humidity testing arrangement 4 that is used for detecting nitrogen gas humidity situation.
The invention provides a nitrogen-introducing drying device for sample drying, which comprises a gas inlet 101 and a gas outlet 102, wherein the gas inlet 101 is communicated with the gas outlet 102 through a pipeline, nitrogen is pumped out through a gas pump 3, the device is provided with a gas humidity testing device 4, the moisture content of the nitrogen is tested through the gas humidity testing device 4, and when the moisture value of the nitrogen is larger than or equal to a set value, the moisture-containing nitrogen is discharged through an exhaust valve 1; when the moisture content value of the nitrogen is smaller than the set value, the nitrogen is refilled into the drying box 100; in practical application, as the gas is heated to 105-110 ℃ in the drying box 100, the heated air takes away most of moisture in the circulating gas path, so that only a small part of nitrogen needs to be discharged, most of nitrogen can be recycled, the gas inlet 101 and the gas outlet 102 of the drying box 100 are communicated through one pipeline, the recycling of nitrogen can be realized, the structure is simpler, the number of control valves 5 is reduced, the complexity of opening and closing control of different control valves 5 is reduced, the structure of the whole device is simpler, and the cost is reduced; in addition, when the sample is dried by introducing nitrogen again, the introduced nitrogen is heated, the temperature of the nitrogen is kept constant after the nitrogen is extracted, and the nitrogen is introduced into the drying oven 100 again, so that the heating time of the nitrogen is shortened, and the overall working efficiency is improved.
Further, in the preferred embodiment, in order to ensure that the experimental results of the samples are not affected, after the nitrogen gas having an unsatisfactory moisture content is discharged, new nitrogen gas is replenished by opening the nitrogen gas control valve 2.
Further, in the preferred embodiment, the gas pump 3 is a variable gas pump capable of adjusting the gas flow rate in the circulating gas path.
Further, in a preferred embodiment, the pipeline is provided with a control valve 5 for controlling the opening and closing of the circulating gas path, and the opening and closing of the pipeline is controlled by the control valve 5.
In this embodiment, the pipeline is further provided with a nitrogen concentration detection device 6 for detecting the nitrogen concentration in the circulating gas path.
When the nitrogen-filled drying device for drying the sample is used for drying the sample, firstly, the air pump 3 is opened to enable air to flow between the drying box 100 and the pipeline in a rotating mode to form a circulating air path, then the nitrogen control valve 2 is opened, nitrogen is introduced into the drying box 100 through the air inlet 101, the control valve 5 on the pipeline is closed, and the exhaust valve 1 is opened to enable air in the drying box 100 to be extruded by the nitrogen and exhausted from the pipeline; the nitrogen concentration detection device 6 detects the nitrogen concentration in the circulating gas path and judges whether the nitrogen concentration is higher than a set value A or not, if so, the exhaust valve 1 is closed, and if the nitrogen concentration value is higher than a set value B, the nitrogen control valve 2 is closed.
In this embodiment, still be equipped with the dewatering filter who is used for cleaing away the gaseous moisture of flow in the pipeline on the pipeline, reduce the water content of gas in the circulation gas circuit, can effectively promote work efficiency.
In this embodiment, the pipeline is further provided with a speed regulating device 8 for regulating the flow rate of the gas in the circulating gas path. The nitrogen gas intake and exhaust amounts can be adjusted by setting the speed adjusting device 8, the exhaust valve 1, and the nitrogen control valve 2 in the circulation gas path, so that the nitrogen gas concentration in the dry box 100 can be increased in a desired effective manner (e.g., the nitrogen gas concentration in the dry box 100 can be increased most quickly or economically or in association with a temperature change in the dry box 100 or in association with the degree of oxidation of the sample in the dry box 100).
In this embodiment, the pipeline is provided with the flow detection device 7 for detecting the gas flow in the circulating gas path, and the specific nitrogen amount introduced into the drying oven 100 can be counted by the flow detection device 7, so that in the process of drying the sample, whether the nitrogen control valve 2 needs to be opened to supplement nitrogen into the pipeline can be determined according to the amount of the nitrogen amount.
In order to meet the temperature requirement for nitrogen-feeding drying, in the present embodiment, the drying oven 100 is connected with an auxiliary heating device for controlling the temperature in the drying oven 100. The auxiliary heating device can be a heating oven or other heating devices with heating function and capable of controlling the temperature to be kept in a certain range. In other embodiments, the drying box 100 with a heating function may be employed, and the drying box 100 includes a heater for heating the drying box 100, a temperature sensor for measuring a temperature inside the drying box 100, and a control panel connected to both the heater and the temperature sensor. The heater is arranged in the drying box 100 and used for heating the drying box 100, the temperature sensor is used for measuring the temperature in the drying box 100, when the temperature measured by the temperature sensor meets the temperature required by nitrogen drying, the control panel controls the heater to be kept in the temperature range required by drying, and if the temperature measured by the temperature sensor fails to meet the temperature requirement required by drying, the control panel can control the heater to be heated to the temperature required by drying through man-machine interaction and parameter setting.
In order to make the nitrogen gas introduced into the drying oven 100 more rapidly and uniformly mixed, in this embodiment, a stirring fan 9 for uniformly mixing the nitrogen gas in the drying oven 100 is provided in the drying oven 100. Further, in the preferred embodiment, the air inlet 101 in the drying oven 100 is arranged at the bottom of the drying oven 100, the air outlet 102 is arranged at the top of the drying oven 100, when the experiment is carried out by using the nitrogen-introducing drying device for drying the sample provided by the invention, when the experiment is started, the stirring fan 9 in the drying box 100 is firstly closed, the gas enters the drying box 100 through the air inlet 101 through the pipeline, the gas temperature is lower than the gas temperature in the drying box 100, the nitrogen concentration is higher than the nitrogen concentration in the drying box 100, therefore, the gas with high temperature floats upwards, the gas with low temperature sinks, because gas outlet 102 sets up at the top of drying cabinet 100, the air that the higher nitrogen content of temperature is few in drying cabinet 100 can discharge drying cabinet 100 more fast, waits that nitrogen gas concentration detection device 6 detects that the nitrogen gas concentration value satisfies the required setting value of experiment, and stirring fan 9 is rotatory makes the nitrogen gas in drying cabinet 100 mix more evenly.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (16)
1. The nitrogen-introducing drying method for drying the sample is characterized by introducing nitrogen into a drying oven to dry the sample, and comprises the following steps of:
s1: pumping out nitrogen in the drying box (100);
s2: detecting the moisture content of the nitrogen;
s3: judging whether the moisture content of the nitrogen is greater than or equal to a set value, if so, directly discharging the nitrogen, and if not, entering the next step;
s4: and the pumped nitrogen is introduced into the drying box (100) again to realize the recycling of the nitrogen.
2. The method for drying the sample by introducing nitrogen according to claim 1, wherein the specific steps in the step S3 are as follows:
s301: judging whether the moisture content of the nitrogen is greater than or equal to a set value, if so, directly discharging the nitrogen and supplementing new nitrogen; if not, go to the next step.
3. The nitrogen-introducing drying method for sample drying according to claim 1, characterized by comprising the following steps before the step S1:
s01: introducing nitrogen into the drying box (100) to exhaust original air;
s02: detecting and judging whether the concentration value of the nitrogen is lower than a set value, if so, continuing to introduce the nitrogen; if not, entering the next step;
s03: the nitrogen gas was stopped and the sample was allowed to dry.
4. The nitrogen-introducing drying method for sample drying according to claim 1, characterized by comprising the following steps before the step S1:
s011: introducing nitrogen into the drying box (100) to exhaust original air;
s021: after the preset time, the nitrogen gas introduction is stopped, and the sample is dried.
5. The nitrogen-introducing drying method for sample drying according to claim 3, further comprising, before the step S01: the temperature in the drying oven (100) is controlled to be kept within the range required for carrying out the drying reaction.
6. The method of claim 4, wherein the step S011 is preceded by: the temperature in the drying oven (100) is controlled to be kept within the range required for carrying out the drying reaction.
7. A lead to nitrogen drying device for sample drying, a serial communication port, including drying cabinet (100), an air inlet (101) and gas outlet (102) have been seted up in drying cabinet (100), air inlet (101) and gas outlet (102) are through the pipeline intercommunication, be equipped with the gas vent on the pipeline, gas vent department is equipped with and is used for controlling air exhaust discharge valve (1), is close to air inlet (101) be equipped with the nitrogen gas interface on the pipeline, the nitrogen gas interface is equipped with nitrogen gas control valve (2), the pipeline passes through nitrogen gas control valve (2) intercommunication nitrogen gas source, be equipped with on the pipeline and be used for taking out gaseous air pump (3) in drying cabinet (100), be equipped with gas humidity testing arrangement (4) that are used for detecting nitrogen gas moisture content on the pipeline.
8. The nitrogen-introducing drying device for sample drying according to claim 7, wherein the pipeline is provided with a control valve (5) for controlling the opening and closing of the circulating gas path.
9. The nitrogen-introducing drying device for drying the sample according to claim 7, wherein the pipeline is provided with a water removal filter for removing water from the gas flowing in the pipeline.
10. The nitrogen-introducing drying device for drying the sample according to claim 7, wherein a nitrogen concentration detection device (6) for detecting the concentration of nitrogen in the circulating gas path is arranged on the pipeline.
11. The nitrogen-introducing drying device for sample drying according to claim 7, wherein the pipeline is provided with a flow detection device (7) for detecting the gas flow in the circulating gas path.
12. The nitrogen-introducing drying device for sample drying according to claim 7, wherein the pipeline is provided with a speed regulating device (8) for regulating the flow rate of gas in the circulating gas path.
13. The nitrogen-feeding drying device for sample drying according to any one of claims 7 to 12, wherein the gas pump (3) is a variable gas pump capable of adjusting the gas flow rate in the circulating gas path.
14. The nitrogen-introducing drying device for sample drying according to any one of claims 7 to 12, wherein the drying oven (100) is connected with an auxiliary heating apparatus for controlling the temperature inside the drying oven (100).
15. The nitrogen-introducing drying device for sample drying according to any one of claims 7 to 12, wherein the drying oven (100) comprises a heater for heating the drying oven (100), a temperature sensor for measuring the temperature inside the drying oven (100), and a control panel connected to both the heater and the temperature sensor.
16. The nitrogen-introducing drying device for drying the sample according to any one of claims 7 to 12, wherein a stirring fan (9) for uniformly mixing the nitrogen gas in the drying oven (100) is arranged in the drying oven (100).
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| CN201910232116.0A CN111750625A (en) | 2019-03-26 | 2019-03-26 | Nitrogen-introducing drying method and device for sample drying |
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| CN201910232116.0A CN111750625A (en) | 2019-03-26 | 2019-03-26 | Nitrogen-introducing drying method and device for sample drying |
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| CN (1) | CN111750625A (en) |
Cited By (2)
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| CN112986486A (en) * | 2021-02-26 | 2021-06-18 | 三门峡市质量技术监督检验测试中心 | Method for detecting content of metallic aluminum in aluminum slag deoxidizer and sample preparation method |
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