CN118243869A - Evaluation device and test method for content of escaped ammonia in filter absorber - Google Patents
Evaluation device and test method for content of escaped ammonia in filter absorber Download PDFInfo
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- CN118243869A CN118243869A CN202410403395.3A CN202410403395A CN118243869A CN 118243869 A CN118243869 A CN 118243869A CN 202410403395 A CN202410403395 A CN 202410403395A CN 118243869 A CN118243869 A CN 118243869A
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 186
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 89
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 78
- 238000011156 evaluation Methods 0.000 title claims abstract description 21
- 238000010998 test method Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 150
- 238000001914 filtration Methods 0.000 claims abstract description 39
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000010926 purge Methods 0.000 claims abstract description 4
- 238000009423 ventilation Methods 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 9
- 230000002265 prevention Effects 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 3
- 230000008676 import Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 13
- 229910052799 carbon Inorganic materials 0.000 description 11
- 239000007789 gas Substances 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 239000003053 toxin Substances 0.000 description 2
- 231100000765 toxin Toxicity 0.000 description 2
- MKKVKFWHNPAATH-UHFFFAOYSA-N [C].N Chemical compound [C].N MKKVKFWHNPAATH-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
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- 230000001681 protective effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
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Abstract
The invention discloses an evaluation device and a test method for the content of escaped ammonia of a filtering absorber, and relates to the field of ammonia content detection. The test method comprises the following steps: purging and preheating; the temperature and humidity in the test cabin are regulated, the air quantity of the filtering absorber is regulated, a stopwatch is started, and the test is started: the filter absorber operates at a set air quantity; observing and recording the concentration change of ammonia; and (5) purging and ending the test. The device and the test method simulate the real environment, and have high precision, stability and accuracy.
Description
Technical Field
The invention relates to the technical field of ammonia content detection, in particular to an evaluation device and a test method for the content of escaped ammonia of a filtering absorber.
Background
The filter absorber is used as an important filter element of collective protection equipment and is arranged in a toxin filtering ventilation system, and toxic air is purified into fresh air by virtue of filling materials such as impregnated carbon, a smoke filtering layer and the like in the filter absorber, so that the effect of filtering the toxic air is achieved.
However, the impregnated carbon is used as a core toxin filtering and purifying material of the filtering absorber, in the preparation process, ammonia water is usually used as a solvent of an impregnating component, the impregnated carbon of the ammonia water system has the problem of ammonia gas escape in the use process, the ammonia gas has corrosiveness and irritation to skin and respiratory organs of a human body, and the problem of ammonia smell escape in the use process of the filtering absorber can seriously influence the use comfort of the protective equipment; therefore, the detection of the ammonia slip is an important indicator of the quality inspection of the filter absorber.
In the existing detection method, only impregnated carbon filled in a filter absorber is detected. The ammonia concentration is measured by adopting a chemical absorption method, and the total content of ammonia escaping from the impregnated carbon in a certain period of time is measured, so that the ammonia escaping curve which changes with time cannot be fed back in real time; the prior art has the advantages that the ammonia escaping content of the impregnated activated carbon is detected, the impregnated carbon is swept by air, the ammonia escaping condition of the impregnated carbon along with the time change is detected in real time, and the method can be used for evaluating the ammonia escaping amount in the development process of the impregnated carbon. However, the carbon sample impregnated with the filler material of the filter absorber is an evaluation target, and cannot accurately reflect the ammonia gas escaping condition of the filter absorber during actual use.
Because the filling processes of the filter absorber are different, such as the influences of filling density, filling mode, filling height, material non-uniformity and the like of filling material impregnated carbon, the actual use condition of the filter absorber cannot be evaluated through an escape ammonia test of the impregnated carbon, and the actual use scene cannot be simulated in an all-round manner, in order to more accurately simulate the escape ammonia condition of the filter absorber in the actual use environment, a filter absorber ammonia escape evaluation device and a test method which are more in line with the use conditions are needed.
Disclosure of Invention
The invention provides an evaluation device and a test method for the content of escaped ammonia of a filter absorber, which are used for solving a series of problems that the content of escaped ammonia of the filter absorber cannot be accurately evaluated only by evaluating the release amount of impregnated carbon ammonia, and the like, in order to solve the problem that the release of the pungent odor of the filter absorber in the use process at present brings obvious discomfort to a user and seriously influences the use experience.
The invention is realized by adopting the following technology:
The invention provides an evaluation device for the content of escaped ammonia of a filtering absorber, which comprises a first test cabin and a second test cabin which are constant temperature and constant humidity and are not communicated with each other, wherein a first fan is arranged in the first test cabin, an air inlet pipe is arranged at an air inlet of the first fan, a first temperature and humidity sensor is connected in the air inlet pipe, an air outlet of the first fan is connected with an inlet of the filtering absorber through a first pipeline, an outlet of the filtering absorber is connected with a ventilation pipe, an inlet end of the ventilation pipe is positioned in the first test cabin, an outlet end of the ventilation pipe is positioned in the second test cabin, an exhaust pipeline which is communicated with the outside is arranged on a bulkhead of the second test cabin, a filtering and absorbing device and the second fan are arranged on the exhaust pipeline, a second temperature and humidity sensor is connected in an outlet of the ventilation pipe, and an air outlet end of the ventilation pipe is connected with an ammonia detector through a sampling pipe.
The device comprises a first test cabin and a second test cabin which are constant temperature and constant humidity and are not communicated with each other, wherein the first test cabin is used for adjusting the constant temperature and constant humidity environment required by a test, the temperature range RT of the first test cabin is 70 ℃, +/-2 ℃, and the relative humidity control range (10-100)% RT, +/-5%; the first test cabin is used for timely supplementing the air flow temperature and humidity required by the filtering absorber when the maximum air volume (500 m 3/h) continuously runs, and the air flow temperature and humidity are kept constant and are the specified values of the test. The air inlet of the first fan is provided with an air inlet pipe, a first temperature and humidity sensor is connected in the air inlet pipe and used for detecting the temperature and humidity of the air inlet, the air outlet of the first fan is connected with the inlet of the filter absorber through a first pipeline, the air volume range of the filter absorber is (40-500) m 3/h, an air volume measurer is arranged on the first pipeline, the first pipeline is connected with an air collecting and preventing system controller which is arranged in the second test cabin and used for controlling the air volume of the filter absorber, and the air collecting and preventing system controller is arranged in the second test cabin and is beneficial to air volume adjustment operation and prolonging the service life of the filter absorber; the outlet of the filtering absorber is connected with the ventilation pipe, the inlet end of the ventilation pipe is positioned in the first test cabin, the outlet end of the ventilation pipe is positioned in the second test cabin, an exhaust pipeline communicated with the outside is arranged on the bulkhead of the second test cabin and used for discharging gas in the second test cabin, a filtering absorbing device and a second fan are arranged on the exhaust pipeline and used for absorbing harmful gas discharged in the second test cabin, the ventilation pipe penetrates out of the first test cabin in a sealing manner and penetrates into the second test cabin, the temperature in the second test cabin is higher than the dew point temperature of test humiture, the test airflow condensation is prevented from leading to lower detection results, condensed water is prevented from entering a detection instrument, the accuracy of the test is also prevented from being influenced, meanwhile, the second test cabin is used for providing the working environment of an ammonia detector, the temperature range of the second test cabin is RT-70 ℃, the temperature of + -2 ℃ is lower than the working temperature allowed by the ammonia detector, the ventilation pipe passes through the temperature and humidity of the first test cabin in a sealing manner, the temperature and the humidity of the second test cabin are stable, the second temperature and humidity sensor is connected in the outlet of the ventilation pipe, the temperature and the humidity of the ventilation pipe are used for detecting the air outlet, the temperature and the humidity of the sample pipe are connected with the ammonia detector, the ammonia detector is connected with the ammonia detector at one end of the infrared detector, the infrared detector is connected with the ammonia detector, the ammonia detector is equal to or less than or equal to or less than or equal to 0 ppm, the measuring accuracy of the measuring range is equal to 0.0, and less than or equal to 300, and the measuring accuracy of the measuring range is equal to 0.0.0 ppm.
A method for testing the ammonia content of a filter absorber, comprising the steps of:
S1: and (3) opening the second fan and the filtering and absorbing device, keeping the continuous opening state until the test is finished, opening an ammonia gas detector, purging with high-purity nitrogen, and simultaneously preheating for at least 30min.
S2: the temperature and the humidity in the first test cabin are adjusted to be the test temperature and the humidity of the filtering absorber, the temperature is 32-55 ℃, and the humidity is 29-95%; and adjusting the temperature in the second test cabin to be greater than the dew point temperature of the test air flow, starting the anti-collecting system controller after the temperature and the humidity in the cabin are stable, adjusting the flow of the first fan to set air quantity, setting the air quantity to 40-400 m 3/h, starting a stopwatch, and starting a test.
S3: the controller of the collection and prevention system is regulated, so that the filter absorber can be ensured to run under the set air quantity in the test process; in the test method, air flow with set air quantity passes through a filtering absorber, and the ammonia concentration at an air outlet of the filtering absorber is detected in real time by adopting the ammonia detector; stopping the test when the concentration of the escaped ammonia is 0 for 15 minutes continuously; stopping the test when the highest escaping ammonia concentration of the test is smaller than the highest allowable concentration specified by the index and the value of the escaping ammonia concentration reaches balance or decreases and does not rise within 15 min; otherwise, continuously testing for 8 hours, and continuously collecting data.
S4: after the test is finished, the ammonia gas detector and the sampling tube are purged by high-purity nitrogen, and the ventilation tube is purged by clean air for at least 30min, so that the test is finished.
Compared with the prior art, the invention has the following beneficial effects:
According to the evaluation device and the test method for the ammonia content escaping from the filter absorber, provided by the invention, the ammonia concentration can be simulated by evaluating the ammonia content escaping from the filter absorber under different air volumes and different temperature and humidity conditions on line in real time, the real condition of the ammonia content escaping from the filter absorber under high-temperature and high-humidity environment conditions can be simulated, the test environment is regulated and controlled and the ammonia concentration is detected and separated through the two environment test cabins, the ammonia detector can be protected from damage to the instrument caused by the entering of crystal water or the overhigh working temperature, the air flow in the test process is ensured not to be condensed, the accuracy and the reliability of the test result are ensured, meanwhile, the constant temperature and humidity air flow of the whole device under the high-temperature and high-humidity test conditions can be controlled, and the scientific and reasonable evaluation of the ammonia content escaping from the filter absorber under different air volumes and different temperature and humidity conditions can be realized, so that the whole device has higher precision and more stable performance.
The whole device is simple and convenient to operate, reasonable in layout, reliable in performance and strong in practicability, can be used for simulating a real use environment, improves working efficiency, and provides theoretical guidance for quality control in the research and development and production processes of the filtering absorber. The test method can detect and record test data on line in real time, has high automation degree and high safety, can evaluate whether the content of the escaping ammonia of the filter absorber meets the index requirement, and guides the improvement of the filling material of the filter absorber.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1-a first temperature and humidity sensor; 2-ventilation pipes; 3-a first fan; 4-an air quantity measurer; 5-a filter absorber; 6-a centralized control system controller; 7-ammonia gas detector; 8-sampling tube; 9-a second temperature and humidity sensor; 10-a first test chamber; 11-a second test chamber; 12-an air inlet pipe; 13-a second fan; 14-filtering and absorbing device; 15-an exhaust pipeline; l1-a first pipeline.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
An evaluation device for the ammonia content of the filtration absorber, as shown in figure 1: the first test cabin 10 is used for adjusting the constant temperature and humidity environment required by the test, the temperature range RT-70 ℃, +/-2 ℃ of the first test cabin 10, and the relative humidity control range (10-100)%RT, +/-5%; the first test chamber 10 is supplied with air flow temperature and humidity which are required by the filter absorber in time when the maximum air volume (500 m 3/h) continuously runs and are kept constant and are the specified values of the test. The first test cabin 10 is internally provided with a first fan 3, an air inlet pipe 12 is arranged at an air inlet of the first fan 3, a first temperature and humidity sensor 1 is connected in the air inlet pipe 12 and used for detecting the temperature and the humidity of the air inlet, an air outlet of the first fan 3 is connected with an inlet of a filtering absorber 5 through a first pipeline L1, the air volume range of the filtering absorber 5 is 40-500 m 3/h, in the embodiment, 40, 200 and 400m 3/h are taken, The air quantity measurer 4 is installed on the first pipeline L1, the first pipeline L1 is connected with the air quantity collection and prevention system controller 6 placed in the second test cabin 11 and used for controlling the air quantity of the filtering absorber, and the air quantity collection and prevention system controller 6 is placed in the second test cabin 11, so that the air quantity regulation operation is facilitated, and the service life of the air quantity collection and prevention system controller is prolonged; The outlet of the filter absorber 5 is connected with the ventilation pipe 2, the inlet end of the ventilation pipe 2 is positioned in the first test cabin 10, the outlet end is positioned in the second test cabin 11, an exhaust pipe 15 communicated with the outside is arranged on the bulkhead of the second test cabin 11, a filter absorber 14 and a second fan 13 are arranged on the exhaust pipe 15 and used for guaranteeing the working environment in the second test cabin and protecting the health of workers, namely the ventilation pipe 2 passes through the first test cabin 10 in a sealing way and penetrates into the second test cabin 11, the temperature in the second test cabin 11 is higher than the dew point temperature of the test temperature and humidity, the test air flow is prevented from condensing to cause the lower detection result, and condensed water is also prevented from entering a detection instrument, The test accuracy is influenced, and meanwhile, the second test cabin 11 is used for providing the working environment of the ammonia detector 7, the temperature range of the second test cabin 11 is RT-70 ℃, +/-2 ℃, the temperature is lower than the allowed working temperature of the ammonia detector, the ventilation pipe 2 passes through the air pipe 2 in a sealing way to ensure the stability of the respective temperature and humidity of the first test cabin 10 and the second test cabin 11, the second temperature and humidity sensor 9 is connected in the outlet of the ventilation pipe 2 and used for detecting the temperature and humidity of an air outlet, the air outlet end in the ventilation pipe 2 is connected with the ammonia detector 7 through the sampling pipe 8, one end of the sampling pipe 8 is connected with the ammonia detector 7, the other end extends into the ventilation pipe 2, the ammonia detector 7 is an infrared gas detector or an electrochemical gas detector, The measuring range is (0-300) ppm, the resolution is less than or equal to 0.5ppm, and the precision is less than or equal to 1%.
A method for testing the ammonia content of a filter absorber, comprising the steps of:
s1: the second fan 13 and the filtering and absorbing device 14 are turned on, the working environment in the second test cabin is ensured, the ammonia detector 7 is turned on, the ammonia detector 7 and the sampling tube 8 are purged by high-purity nitrogen, and meanwhile, the ammonia detector is preheated for at least 30 minutes.
S2: in this embodiment, in order to meet various standard requirements, 6 different temperatures and humidities are taken for testing by referring to different standards, and the specific steps are as follows:
Sample environment 1, according to GJB 5834-2006, limit value of harmful gas concentration in armored vehicle cabin, the climatic conditions of harmful gas concentration detection in armored vehicle cabin accord with the rule of 6.1 in GJB 5421-2005, the test conditions in 6.1 in GJB 5421-2005 refer to GJB 59.63-96, and the environmental temperature is not lower than 32 ℃ and the relative humidity is not lower than 65% when the armored vehicle is tested.
According to GJB 1835-93 'requirements for overall design of armored vehicle man-machine-environmental system', the relative humidity of armored vehicle is preferably controlled within 30% -70%.
For the purpose of tight examination, the normal working test conditions of the armored vehicle with the temperature of 32 ℃ and the relative humidity of 70% are taken in combination with the standard regulations.
Sample environment 2, according to GJB 282.4-95 "environmental conditions working and storage Environment humidity of armored vehicle", the high temperature and high humidity index of the working environment of armored vehicle is usually 95% relative humidity and 30% corresponding temperature,
According to GJB 59.63-96 'armored vehicle test procedure in-vehicle ventilation and refrigeration performance test', the ambient temperature is not lower than 32 ℃ and the relative humidity is not lower than 65% in the armored vehicle test.
And comprehensively regulating working temperature and humidity of the armored vehicle by using the GJB 282.4-95 and the GJB 59.63-96, taking the highest temperature and humidity condition and taking the damp-heat test condition with the temperature of 32 ℃ and the relative humidity of 95%.
Sample environment 3, according to the highest environmental temperature and relative humidity of each national province in annex C of GB 50264-2013 industrial equipment and pipeline adiabatic engineering design Specification, GJB 1172.2-91 climate extremum ground climate of military equipment, and the temperature and relative humidity corresponding to the 1% working extremum of high temperature in 150 stations of the country.
In view of the above standard specification, extreme high temperature and high humidity test conditions were taken at a temperature of 45℃and a relative humidity of 80%.
Sample environment 4, according to the technical index of the filter absorber, the maximum working temperature of the filter absorber is 55 ℃, the corresponding humidity at 55 ℃ is 29% according to the humidity content of 32.1g/kg when the temperature of the wet heat test condition is 32 ℃ and the relative humidity is 95%.
Therefore, a temperature of 55℃and a relative humidity of 29% were selected as the high temperature test conditions.
Sample environment 5, part 3 of the laboratory environmental test method for military equipment according to GJB 150.3A-2009: high temperature test, in which the filter absorber is stored at 70℃for 48 hours, and after the temperature is restored to normal temperature, the ammonia slip test is carried out under the condition that the temperature is 32℃and the relative humidity is 70%.
For the tight examination, a test was performed at a temperature of 32℃and a relative humidity of 95%.
Sample environment 6, part 18 of the military equipment laboratory environmental test method according to GJB 150.18 a-2009: impact test and GJB 150.16a-2009, part 16 of the laboratory environmental test method for military equipment: vibration test the filtering absorber was subjected to impact and vibration, and then an ammonia slip test was performed according to the conditions of normal operation test of an armored vehicle at 32℃and a relative humidity of 70%.
For the tight examination, after the filter absorber is impacted and vibrated, the test is carried out under the conditions that the temperature is 32 ℃ and the relative humidity is 95%.
The test environments and the corresponding dew points of the samples 1 to 6 are summarized as follows:
the temperature and the humidity in the first test cabin 10 are adjusted to be the test temperature and the humidity of the filtering absorber 5, the temperature in the second test cabin 11 is adjusted to be higher than the dew point temperature of the test air flow, after the temperature and the humidity in the cabin are stable, the anti-collecting system controller 6 is started, the flow of the first fan 3 is adjusted to the set air quantity, and meanwhile, a stopwatch is started to start the test.
S3: the collection and prevention system controller 6 is regulated, so that the filter absorber 5 runs under the set air quantity in the test process; observing an ammonia detector 7 and recording the ammonia concentration change value and the corresponding time; stopping the test when the concentration of the escaped ammonia is 0 for 15 minutes continuously; stopping the test when the highest escaping ammonia concentration of the test is smaller than the highest allowable concentration specified by the index and the value of the escaping ammonia concentration reaches balance or decreases and does not rise within 15 min; otherwise, the test is continued for 8 hours.
S4: after the test is finished, the ammonia gas detector 7 and the sampling tube 8 are purged by high-purity nitrogen, and the ventilation tube 2 is purged by clean air for at least 30min, so that the test is finished.
And processing the test results, wherein the test results of the ammonia escaping from the filter absorber are expressed by weighted average concentration and short-time contact maximum concentration in the test time, and the calculation process is as follows:
1) Weighted average concentration of evolved ammonia over test time
According to annex B of GJB 5834-2006, the limit value of harmful gas concentration in armored vehicle cabin, the weighted average concentration in the test time is calculated according to the formula (1):
E=（C1T1+C2T2+…+CnTn）/T （1）
Wherein:
e represents the weighted average concentration of evolved ammonia in ppm over the test time;
t represents the total test time, min;
C 1、C2、…Cn respectively represents the ammonia concentration and ppm corresponding to the time T 1、T2、…Tn;
T 1、T2、…Tn denotes the sampling time, min.
2) Contact with maximum ammonia concentration for a short period of time
According to annex B of GJB 5834-2006, limit value of harmful gas concentration in armored vehicle cabin, the short-time contact maximum concentration is calculated according to formula (2):
Emax=（C1T1+C2T2+…+C15T15）/15 （2）
Wherein:
e max -a weighted average concentration of evolved ammonia, ppm, within 15min containing the highest concentration value;
c 1、C2、…C15 -respectively is the ammonia concentration and ppm corresponding to the time T 1、T2、…T15;
T 1、T2、…T15 -sampling time, min.
3) Maximum ammonia concentration escaping
The highest ammonia slip concentration was read directly in the test record.
The test method of the invention is adopted to evaluate the sample:
1. Under different temperature and humidity test conditions, 200m 3/h air quantity is taken to carry out an ammonia escaping test on a certain type of filtering absorber, and the test results are shown in the table below.
2. Under different temperature and humidity test conditions, 400m 3/h air quantity is taken to carry out an ammonia escaping test on a certain type of filter absorber, and the evaluation test of the condition is omitted in 400m 3/h air quantity in consideration of the fact that impact vibration has no obvious influence on a sample, and the test results are shown in the table below.
3. Under different temperature and humidity test conditions, 40m 3/h air quantity is taken to carry out an ammonia escaping test on a certain type of filtering absorber, and the test results are shown in the table below.
As can be seen from the above table, the weighted average concentration and the short-time contact maximum concentration of a certain filter absorber obtained by detection show obvious differences in test time under different temperatures and humidity and different pretreatment, and the evaluation device and the test method can be confirmed to accurately provide an evaluation environment, and the test method is reasonable and feasible.
The scope of the present invention is not limited to the above embodiments, and various modifications and alterations of the present invention will become apparent to those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. An evaluation device for the content of ammonia escaping from a filtering absorber is characterized in that: including constant temperature and humidity and each other first test cabin (10) and second test cabin (11) that do not communicate, be equipped with first fan (3) in first test cabin (10), air intake installation of first fan (3) has also air-supply line (12), air-supply line (12) in-connection has first temperature and humidity sensor (1), the import of filtering absorber (5) is connected through first pipeline (L1) to the air outlet of first fan (3), the export of filtering absorber (5) is connected with ventilation pipe (2), the entrance point of ventilation pipe (2) is located first test cabin (10), and the exit end is located second test cabin (11), be equipped with on the bulkhead of airing exhaust of second test cabin (11) with external intercommunication pipeline (15), install filtration absorber (14) and second fan (13) on pipeline (15), the export in-connection of ventilation pipe (2) has second temperature and humidity sensor (9), the exit end of ventilation pipe (2) is connected with sampling instrument (7) through detecting in the appearance (8).
2. An evaluation device for the ammonia content of a filter absorber according to claim 1, wherein: an air quantity measurer (4) is arranged on the first pipeline (L1).
3. An evaluation device for the ammonia content of a filter absorber according to claim 1, wherein: the first pipeline (L1) is connected with a collection and prevention system controller (6) placed in the second test cabin (11).
4. An evaluation device for the ammonia content of a filter absorber according to claim 1, wherein: one end of the sampling tube (8) is connected with the ammonia detector (7), and the other end of the sampling tube extends into the ventilation tube (2).
5. An evaluation device for the ammonia content of a filter absorber according to claim 1, wherein: the temperature in the second test cabin (11) is higher than the dew point temperature of the test humiture.
6. An evaluation device for the ammonia content of a filter absorber according to claim 1, wherein: the measuring range of the ammonia gas detector (7) is (0-300) ppm, the resolution is less than or equal to 0.5ppm, and the precision is less than or equal to 1%.
7. An evaluation device for the ammonia content of a filter absorber according to claim 1, wherein: the temperature range RT of the first test cabin (10) is 70 ℃, +/-2 ℃, and the relative humidity control range (10-100)% RT, +/-5%; the temperature range of the second test cabin (11) is RT-70 ℃ and +/-2 ℃.
8. A test method for the ammonia content escaping from a filtering absorber is characterized by comprising the following steps of: the method comprises the following steps:
S1: opening a second fan (13) and a filtering and absorbing device (14), opening an ammonia detector (7) and purging with high-purity nitrogen, and simultaneously preheating for at least 30min;
S2: the temperature and the humidity in the first test cabin (10) are adjusted to be the test temperature and the humidity of the filtering absorber (5), the temperature in the second test cabin (11) is adjusted to be larger than the dew point temperature of the test air flow, after the temperature and the humidity in the cabin are stable, the anti-collecting system controller (6) is started, the flow of the first fan is adjusted to the set air quantity, and a stopwatch is started at the same time, so that the test is started;
S3: the control device (6) of the collection and prevention system is regulated to ensure that the filtering absorber (5) operates under the set air quantity in the test process; observing an ammonia detector (7) and recording the ammonia concentration change value and the corresponding time;
s4: after the test is finished, the ammonia gas detector (7) and the sampling tube (8) are purged by high-purity nitrogen, and the ventilation tube (2) is purged by clean air for at least 30min, so that the test is finished.
9. A method of testing the ammonia slip of a filter absorber according to claim 8, wherein:
in the step S3, when the concentration of the escaped ammonia is 0 for 15 minutes continuously, stopping the test; stopping the test when the highest escaping ammonia concentration of the test is smaller than the highest allowable concentration specified by the index and the value of the escaping ammonia concentration reaches balance or decreases and does not rise within 15 min; otherwise, the test is continued for 8 hours.
10. A method of testing the ammonia slip of a filter absorber according to claim 8, wherein: in the step S2, the temperature is 32-55 ℃, and the humidity is 29-95%; the air volume is set to be 40-400 m 3/h.
Priority Applications (1)
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