CN117907548A - Formaldehyde detection method and formaldehyde detection device - Google Patents
Formaldehyde detection method and formaldehyde detection device Download PDFInfo
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- CN117907548A CN117907548A CN202410310390.6A CN202410310390A CN117907548A CN 117907548 A CN117907548 A CN 117907548A CN 202410310390 A CN202410310390 A CN 202410310390A CN 117907548 A CN117907548 A CN 117907548A
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 1152
- 238000001514 detection method Methods 0.000 title claims abstract description 138
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 301
- 239000000126 substance Substances 0.000 claims abstract description 109
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 108
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000004887 air purification Methods 0.000 claims description 50
- 238000001914 filtration Methods 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 15
- 239000003153 chemical reaction reagent Substances 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 14
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000001179 sorption measurement Methods 0.000 description 19
- 229920006395 saturated elastomer Polymers 0.000 description 17
- 238000004364 calculation method Methods 0.000 description 10
- 230000007423 decrease Effects 0.000 description 5
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002068 genetic effect Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The invention provides a formaldehyde detection method and a formaldehyde detection device, and relates to the technical field of formaldehyde detection, wherein the method comprises the following steps: if the first concentration information is greater than or equal to a first concentration threshold value, starting the air purifying device; obtaining second concentration information of formaldehyde; determining whether to replace the activated carbon filter and whether to add a chemical formaldehyde removal agent according to the first concentration information and the second concentration information; determining the dosage of the chemical formaldehyde removing agent and the quantity of the changed active carbon filters; after adding chemical formaldehyde removing agent and replacing active carbon filter, starting air purifying equipment, and continuously detecting formaldehyde concentration information; and stopping detection when the concentration information of formaldehyde is lower than or equal to a preset standard concentration threshold value. According to the invention, the formaldehyde removal efficiency and effect can be improved by using the detection result of the formaldehyde concentration, the formaldehyde concentration can be continuously detected, the real-time and accurate monitoring of the formaldehyde concentration can be realized, and an accurate data basis is provided for judging the formaldehyde removal effect.
Description
Technical Field
The invention relates to the technical field of formaldehyde detection, in particular to a formaldehyde detection method and a formaldehyde detection device.
Background
In the related art, CN112198207a discloses a formaldehyde detection method, which comprises the following steps: acquiring detection data of two formaldehyde sensors with different reaction strengths on interference components in the same environment; and comparing the detection data of the two formaldehyde sensors, judging whether the interference gas exists, and calculating the formaldehyde concentration value in the environment according to the detection data of the two formaldehyde sensors. In the formaldehyde detection method, the detection data of the two formaldehyde sensors when the interference components appear have obvious differences, so that the interference condition of detecting formaldehyde can be effectively judged, and a more accurate formaldehyde detection value can be calculated and obtained. The invention also relates to a formaldehyde detection device which comprises a controller, a first formaldehyde sensor and a second formaldehyde sensor, wherein the first formaldehyde sensor and the second formaldehyde sensor have different reaction intensities on interference components, the first formaldehyde sensor and the second formaldehyde sensor are respectively and electrically connected with the controller, and the formaldehyde detection device is simple in detection, low in cost and accurate in output result, and can judge the interference condition.
CN114740146B discloses a formaldehyde detection method, in the same environment, detection data of a first formaldehyde sensor and a second formaldehyde sensor are respectively obtained, and the reaction intensities of the first formaldehyde sensor and the second formaldehyde sensor on interference components are different; the detection data of the first formaldehyde sensor and the second formaldehyde sensor are synchronously processed to obtain the synchronous data V10 of the first formaldehyde sensor and the synchronous data V20 of the second formaldehyde sensor at present, so that the detection data change trend of the first formaldehyde sensor and the second formaldehyde sensor at the same time is consistent; and comparing the synchronous data variable quantities of the first formaldehyde sensor and the second formaldehyde sensor to judge whether the interference gas exists, and calculating the formaldehyde concentration value in the environment according to the judgment result of the interference gas and the synchronous data of the two formaldehyde sensors. The formaldehyde method has higher calculation accuracy.
Based on the above related technology, the technical problem that the interfering gas interferes with the accuracy of the formaldehyde detection result can be solved, however, the related technology cannot continuously measure the change condition of the formaldehyde concentration, cannot effectively utilize the measurement result of the formaldehyde concentration, namely, cannot monitor the change condition of the formaldehyde concentration in the formaldehyde removal process, cannot optimize the formaldehyde removal process by utilizing the detection result, and cannot detect the formaldehyde removal effect.
The information disclosed in the background section of the application is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a formaldehyde detection method and a formaldehyde detection device, which can solve the technical problems that the change condition of formaldehyde concentration cannot be continuously detected and the detection result of the formaldehyde concentration cannot be effectively utilized.
According to a first aspect of the present invention, there is provided a formaldehyde detection method comprising:
Detecting first concentration information of formaldehyde at the beginning time of a current detection period through a formaldehyde sensor arranged in a preset space;
If the first concentration information is greater than or equal to a first concentration threshold value, starting air purification equipment, and performing formaldehyde removal treatment in the current detection period, wherein the air purification equipment comprises an activated carbon filter for filtering and adsorbing formaldehyde;
acquiring second concentration information of formaldehyde in the preset space through a formaldehyde sensor at a plurality of moments of the current detection period;
determining whether an activated carbon filter needs to be replaced or not and whether a chemical formaldehyde removal agent needs to be added into air purification equipment or not according to the first concentration information and the second concentration information;
If the active carbon filter needs to be replaced and a chemical formaldehyde removing agent needs to be added, determining the dosage of the chemical formaldehyde removing agent and the quantity of the replaced active carbon filter according to the first concentration information, the second concentration information, the first cost information of the active carbon filter and the second cost information of the chemical formaldehyde removing agent;
after adding a chemical formaldehyde removing agent into the air purifying equipment according to the dosage and replacing an active carbon filter, starting the air purifying equipment, and continuously detecting concentration information of formaldehyde through a formaldehyde sensor;
and stopping detection when the concentration information of formaldehyde is lower than or equal to a preset standard concentration threshold value.
According to a second aspect of the present invention, there is provided a formaldehyde detection apparatus comprising:
The first concentration information module is used for detecting first concentration information of formaldehyde at the starting time of the current detection period through a formaldehyde sensor arranged in a preset space;
The first air purification module is used for starting air purification equipment to perform formaldehyde removal treatment in the current detection period if the first concentration information is greater than or equal to a first concentration threshold value, wherein the air purification equipment comprises an activated carbon filter for filtering and adsorbing formaldehyde;
The second concentration information module is used for acquiring second concentration information of formaldehyde in the preset space through the formaldehyde sensor at a plurality of moments of the current detection period;
The judging module is used for determining whether the activated carbon filter needs to be replaced or not and whether a chemical formaldehyde removing agent needs to be added into the air purifying equipment or not according to the first concentration information and the second concentration information;
if the equipment module is replaced and the active carbon filter needs to be replaced and the chemical formaldehyde removing agent needs to be added, determining the dosage of the chemical formaldehyde removing agent and the quantity of the replaced active carbon filter according to the first concentration information, the second concentration information, the first cost information of the active carbon filter and the second cost information of the chemical formaldehyde removing agent;
the second air purification module is used for starting the air purification equipment after adding a chemical formaldehyde removal agent into the air purification equipment according to the dosage and replacing an active carbon filter, and continuously detecting concentration information of formaldehyde through a formaldehyde sensor;
and finishing the detection module, and stopping detection when the concentration information of the formaldehyde is lower than or equal to a preset standard concentration threshold value.
The technical effects are as follows: according to the invention, the formaldehyde concentration in the preset space can be continuously detected, the mode of removing formaldehyde of the air purifying equipment is optimized by utilizing the detected formaldehyde concentration, an accurate data basis is provided for the formaldehyde removing process, and the dosage of chemical formaldehyde removing agents and the accurate quantity of the changed active carbon filters are determined. And after the formaldehyde removal mode is optimized, the formaldehyde concentration is continuously detected until the formaldehyde concentration reaches below a preset standard concentration threshold value, so that the formaldehyde removal effect can be determined by effectively utilizing the detection result of the formaldehyde concentration. The formaldehyde concentration detection result can be utilized to improve the formaldehyde removal efficiency and effect, and the formaldehyde concentration can be continuously detected, so that the formaldehyde concentration can be monitored accurately in real time, and an accurate data basis is provided for judging the formaldehyde removal effect. When judging whether to replace the activated carbon filter, the first condition judgment parameters under the condition that whether the adsorption capacity of the activated carbon filter to formaldehyde is saturated or not can be respectively determined through the condition function, and in the calculation process, the formaldehyde adsorption speed of the activated carbon filter is fully considered, so that the requirement of replacing the activated carbon filter is determined through the formaldehyde adsorption speed, and the judgment accuracy of replacing the activated carbon filter is improved. When the active carbon filter does not need to be replaced and whether the chemical formaldehyde removal agent needs to be added is determined, the first expected duration can be determined according to the average change rate and the second concentration information, and in the calculation process, the formaldehyde filtration speed under the condition that the active carbon filter does not need to be replaced is fully considered, so that the scientificity and the accuracy of the first expected duration are improved, and a data basis is provided for determining whether the chemical formaldehyde removal agent needs to be added in the air purification equipment. When the activated carbon filter needs to be replaced and whether the chemical formaldehyde removal agent needs to be added is determined, the second expected duration can be determined according to the theoretical change rate and the second concentration information, and in the calculation process, the formaldehyde filtration speed under the condition that the activated carbon filter needs to be replaced is fully considered, so that the second expected duration of the activated carbon filter for removing formaldehyde is determined under the condition that the activated carbon filter is replaced in time, the scientificity and the accuracy of the second expected duration are improved, and a data basis is provided for determining whether the chemical formaldehyde removal agent needs to be added in the air purification equipment. When determining the dosage of the chemical formaldehyde-removing agent and the number of the replaced activated carbon filters, the constraint condition of the dosage prediction model can be obtained according to the second concentration information, the objective function of the dosage prediction model can be obtained according to the first cost information and the second cost information and the formaldehyde removing time, the dosage of the chemical formaldehyde-removing agent predicted by the dosage prediction model and the number of the activated carbon filters can be ensured to be reduced to the preset concentration, the difference between the formaldehyde removing time and the preset first time threshold is minimized, the formaldehyde removing cost is minimized, the time required in the formaldehyde removing process is reduced, the formaldehyde removing efficiency is improved, and the formaldehyde removing cost is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed. Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the invention or the solutions of the prior art, the drawings which are necessary for the description of the embodiments or the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other embodiments may be obtained from these drawings without inventive effort to a person skilled in the art,
FIG. 1 schematically illustrates a flow chart of a formaldehyde detection method according to an embodiment of the invention;
Fig. 2 exemplarily shows a block diagram of a formaldehyde detection method according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 1 schematically shows a flow chart of a formaldehyde detection method according to an embodiment of the invention, the method comprising: step S101, detecting first concentration information of formaldehyde at the beginning time of a current detection period through a formaldehyde sensor arranged in a preset space; step S102, if the first concentration information is greater than or equal to a first concentration threshold value, starting air purification equipment, and performing formaldehyde removal treatment in the current detection period, wherein the air purification equipment comprises an activated carbon filter for filtering and adsorbing formaldehyde; step S103, acquiring second concentration information of formaldehyde in the preset space through a formaldehyde sensor at a plurality of moments of the current detection period; step S104, determining whether an activated carbon filter needs to be replaced or not and whether a chemical formaldehyde removal agent needs to be added into air purification equipment or not according to the first concentration information and the second concentration information; step S105, if the active carbon filter needs to be replaced and a chemical formaldehyde removal agent needs to be added, determining the dosage of the chemical formaldehyde removal agent and the quantity of the replaced active carbon filter according to the first concentration information, the second concentration information, the first cost information of the active carbon filter and the second cost information of the chemical formaldehyde removal agent; step S106, after adding chemical formaldehyde removing agents into the air purifying equipment according to the dosage and replacing the activated carbon filter, starting the air purifying equipment, and continuously detecting concentration information of formaldehyde through a formaldehyde sensor; step S107, stopping detection when the concentration information of formaldehyde is lower than or equal to a preset standard concentration threshold value.
According to the formaldehyde detection method provided by the embodiment of the invention, the formaldehyde concentration in the preset space can be continuously detected, the mode of removing formaldehyde by the air purification equipment is optimized by utilizing the detected formaldehyde concentration, an accurate data basis is provided for the formaldehyde removal process, and the dosage of chemical formaldehyde removal agents and the accurate number of the replaced active carbon filters are determined. And after the formaldehyde removal mode is optimized, the formaldehyde concentration is continuously detected until the formaldehyde concentration reaches below a preset standard concentration threshold value, so that the formaldehyde removal effect can be determined by effectively utilizing the detection result of the formaldehyde concentration. The formaldehyde concentration detection result can be utilized to improve the formaldehyde removal efficiency and effect, and the formaldehyde concentration can be continuously detected, so that the formaldehyde concentration can be monitored accurately in real time, and an accurate data basis is provided for judging the formaldehyde removal effect.
According to one embodiment of the present invention, in step S101, first concentration information of formaldehyde is detected at a start time of a current detection period by a formaldehyde sensor disposed in a preset space. For example, one detection period is set to one hour, detection data of a plurality of formaldehyde sensors arranged in a factory building are respectively acquired at the beginning, and average is carried out according to the detection data to determine first concentration information of formaldehyde.
According to one embodiment of the present invention, if the first concentration information is greater than or equal to a first concentration threshold value, an air cleaning device is started, and formaldehyde removal treatment is performed in a current detection period, wherein the air cleaning device includes an activated carbon filter for filtering and adsorbing formaldehyde in step S102. For example, the preset space is a factory building, when the first concentration information of formaldehyde detected by the formaldehyde sensor is greater than or equal to a first concentration threshold value, the formaldehyde concentration in the factory building is high, the factory building is not suitable for being put into production and used, the air purification equipment needs to be started, the air purification equipment comprises an activated carbon filter for filtering and adsorbing formaldehyde, and the formaldehyde can be adsorbed and filtered in a physical mode.
According to one embodiment of the present invention, in step S103, at a plurality of times of the current detection period, second concentration information of formaldehyde in the preset space is obtained by the formaldehyde sensor. For example, each minute in one hour is set as each time of the detection period, and at a plurality of times of the current detection period, second concentration information of formaldehyde in the plant is acquired by the formaldehyde sensor.
According to one embodiment of the present invention, in step S104, it is determined whether the activated carbon filter needs to be replaced and whether a chemical formaldehyde removal agent needs to be added to the air cleaning apparatus, based on the first concentration information and the second concentration information. For example, the decrease rate and decrease degree of the formaldehyde concentration in the factory are judged based on the first concentration information and the second concentration information, and it is determined whether the activated carbon filter needs to be replaced or not and whether a chemical formaldehyde removal agent needs to be added to the air cleaning apparatus or not by the decrease rate and decrease degree of the formaldehyde concentration.
According to one embodiment of the present invention, determining whether an activated carbon filter needs to be replaced and whether a chemical formaldehyde removal agent needs to be added to an air cleaning apparatus based on the first concentration information and the second concentration information includes:
fitting the first concentration information, the second concentration information and the moment in the current detection period to obtain a first concentration function of formaldehyde concentration in the current detection period; obtaining a first concentration derivative function according to the first concentration function; determining concentration change rates at a plurality of moments in a current detection period according to the first concentration derivative function; determining whether the activated carbon filter needs to be replaced according to the concentration change rate; and determining whether a chemical formaldehyde removal agent is required to be added into the air purification equipment according to the first concentration information, the second concentration information and the concentration change rate.
For example, fitting the first concentration information, the second concentration information and the time in the current detection period to obtain a first concentration function for describing a rule that the formaldehyde concentration in the current detection period decreases with time; according to the first concentration function, a first concentration derivative function is obtained, for example, the first concentration function can be subjected to derivative to obtain the first concentration derivative function, a plurality of moments in the current period are substituted into the first concentration derivative function, and the concentration change rates of a plurality of moments in the current detection period are determined; according to the concentration change rate, whether the activated carbon filter needs to be replaced or not can be judged; and judging whether the chemical formaldehyde removal agent is required to be added according to the first concentration information, the second concentration information and the concentration change rate.
According to one embodiment of the invention, determining whether an activated carbon filter needs to be replaced according to the concentration change rate comprises: acquiring the concentration change rate of the 1 st to m th moments and the concentration change rate of the n-m+1 th to n th moments in the current detection period, wherein n is the number of the moments in each detection period, m is the preset number, m is less than n, and m and n are positive integers; determining a first condition discrimination parameter according to formula (1)，
（1）
Wherein,For the i-th moment in the current detection cycle,/>For the concentration change rate at the ith moment in the current detection period,/>The method comprises the steps that if is a preset first change rate threshold value, and if is a conditional function; and if the first condition discrimination parameter is smaller than or equal to the first condition threshold value, determining that the activated carbon filter needs to be replaced.
In accordance with one embodiment of the present invention, in equation (1), the following two cases can be expressed by the form of a conditional function whenWhen the average value of the absolute values of the concentration change rates at the 1 st to m th moments of the current period is larger than or equal to a first change rate threshold value, the active carbon filter in the air purifying equipment is used for adsorbing formaldehyde, the adsorption capacity of the active carbon filter on formaldehyde is not saturated, and the active carbon filter can be continuously used, and the value of the condition function is/>。
According to one embodiment of the invention, whenWhen the average value of the absolute values of the concentration change rates at the 1 st to m th moments of the current period is smaller than the first change rate threshold value, the effect of the activated carbon filter in the air purification equipment on absorbing formaldehyde is poor, the adsorption capacity of the activated carbon filter on formaldehyde is saturated, the activated carbon filter cannot be used continuously, and at the moment, the value of the condition function is 0.
According to one embodiment of the invention, whenIn the time-course of which the first and second contact surfaces,，/>Is the summation average value of concentration change rates from 1 st to m th time points of the current period,/>Is the sum average value of concentration change rates from n-m+1 to the nth time of the current period,/>The ratio of the average value of the concentration change rates at the n-m+1 to n-th moments of the current period to the average value of the concentration change rates at the 1 st to m-th moments of the current period is smaller, the concentration change rate at the latter m-th moments of the current detection period is larger than the concentration change rate difference at the former m-th moments, that is, the larger the capability of the activated carbon filter for absorbing formaldehyde is reduced, the more likely the condition that the adsorption capability of the activated carbon filter for formaldehyde is saturated, in other words, the more the activated carbon filter needs to be replaced. Therefore, the smaller the first condition discrimination parameter, the more the activated carbon filter needs to be replaced. If the first condition discrimination parameter is less than or equal to a first condition threshold (e.g., 0.5, etc.), it is determined that the activated carbon filter needs to be replaced.
In this way, the first condition discrimination parameters of the activated carbon filter under the condition that whether the adsorption capacity of the activated carbon filter to formaldehyde is saturated can be respectively determined through the condition function, and the formaldehyde adsorption speed of the activated carbon filter is fully considered in the calculation process, so that the requirement of changing the activated carbon filter is determined through the formaldehyde adsorption speed, and the judgment accuracy of changing the activated carbon filter is improved.
According to an embodiment of the present invention, determining whether a chemical formaldehyde-removing agent is required to be added to an air cleaning apparatus based on the first concentration information, the second concentration information, and the concentration change rate includes: if the activated carbon filter does not need to be replaced, determining the average change rate of formaldehyde concentration information in the current detection period according to the concentration change rate; determining whether a chemical formaldehyde removal agent needs to be added to the air purification device according to the average change rate and the second concentration information; if the activated carbon filter needs to be replaced, determining the theoretical replacement time length of the activated carbon filter and the theoretical change rate of formaldehyde concentration information in the theoretical replacement time length according to the concentration change rate; and determining whether a chemical formaldehyde-removing agent is required to be added into the air purifying equipment according to the theoretical replacement time length and the theoretical change rate.
For example, when the first condition discrimination parameter is greater than a set threshold, the activated carbon adsorber is not saturated, and the activated carbon filter does not need to be replaced, determining an average change rate of formaldehyde concentration information in a current detection period according to the concentration change rate, and determining whether a chemical formaldehyde removal agent needs to be added into the air purification equipment according to the average change rate and the second concentration information. For another example, when the first condition discrimination parameter is smaller than the set threshold, the activated carbon adsorber is saturated, and the activated carbon filter needs to be replaced, a theoretical replacement period of the activated carbon filter and a theoretical change rate of formaldehyde concentration information within the theoretical replacement period are determined according to the concentration change rate, for example, when the concentration change rate is fromChange to/>When the active carbon filter is replaced, the initial time of the current detection period can be subtracted from the time of replacing the active carbon filter to obtain the theoretical replacement time of the active carbon filter, the theoretical change rate is the formaldehyde adsorption rate of the active carbon filter in the unsaturated stage, in other words, the theoretical change rate is the average change rate between the initial time of the current detection period and the time of replacing the active carbon filter, and further, whether the chemical formaldehyde removal agent needs to be added into the air purification equipment can be determined according to the theoretical replacement time and the theoretical change rate.
According to one embodiment of the present invention, determining whether a chemical formaldehyde-removing agent is required to be added to an air cleaning apparatus based on the average rate of change and the second concentration information comprises: determining a first expected duration of time required for formaldehyde removal by the activated carbon filter according to equation (2)，
（2）
Wherein,At a preset concentration,/>For the second concentration information at the end of the current detection period,Is the average rate of change; and if the first expected time length is greater than or equal to a preset first time length threshold value, determining that a chemical formaldehyde removal agent needs to be added into the air purification equipment.
According to one embodiment of the invention, if the activated carbon filter does not need to be replaced, that is, the adsorption capacity of the activated carbon filter to formaldehyde is not saturated, the activated carbon filter can be continuously used, so that a plurality of moments in the current detection period are all moments when the adsorption capacity of the activated carbon filter to formaldehyde is not saturated, and the average change rate of the moments can represent the average speed of the activated carbon filter to adsorb formaldehyde.Is the difference between the preset concentration and the second concentration information,/>The ratio of the difference value of the preset concentration and the second concentration information to the average change rate is used for indicating the length of time required for the formaldehyde concentration to drop from the second concentration information to the preset concentration according to the average change rate, namely, the first expected duration; if the first expected time length is greater than or equal to the preset first time length threshold, the formaldehyde filtering speed is low by means of the activated carbon filter, the formaldehyde concentration cannot be reduced to the preset concentration within the preset first time length threshold, and chemical formaldehyde removing agents are required to be added into the air purifying equipment, so that the formaldehyde concentration reduction speed is accelerated.
According to the method, the first expected duration can be determined according to the average change rate and the second concentration information, and in the calculation process, the formaldehyde filtering speed under the condition that an active carbon filter does not need to be replaced is fully considered, so that the scientificity and the accuracy of the first expected duration are improved, and a data basis is provided for determining whether a chemical formaldehyde removal agent needs to be added into air purification equipment.
According to one embodiment of the present invention, if the activated carbon filter needs to be replaced, determining a theoretical replacement time period of the activated carbon filter and a theoretical change rate of formaldehyde concentration information within the theoretical replacement time period according to the concentration change rate, including: determining the first moment that the absolute value of the concentration change rate is smaller than or equal to a preset second change rate threshold value in the current detection period as a theoretical replacement moment; and determining an average value of concentration change rates at a plurality of moments in a time interval between the theoretical replacement moment and the 1 st moment of the current detection period as the theoretical change rate.
For example, the second rate of change threshold is set toThe absolute value of the concentration change rate is smaller than or equal to/>, in the current detection periodWhen the adsorption capacity of the activated carbon filter to formaldehyde is nearly saturated, the first moment that the absolute value of the concentration change rate is smaller than or equal to a preset second change rate threshold value in the current detection period is determined as a theoretical change moment, and the average value of the concentration change rates at a plurality of moments in the time interval between the theoretical change moment and the 1 st moment of the current detection period is determined as the theoretical change rate.
According to one embodiment of the present invention, determining whether a chemical formaldehyde-removing agent is required to be added to an air cleaning apparatus based on the theoretical replacement time period and the theoretical change rate includes: determining a second expected duration of time required for formaldehyde removal by the activated carbon filter according to equation (3)，
（3）
Wherein,At a preset concentration,/>For the second concentration information at the end of the current detection period,/>Is the theoretical rate of change; and if the second expected time length is greater than or equal to a preset first time length threshold value, determining that a chemical formaldehyde removal agent needs to be added into the air purification equipment.
According to one embodiment of the present invention, if the activated carbon filter needs to be replaced, i.e. the adsorption capacity of the activated carbon filter for formaldehyde is saturated, so that in the current detection period, only a plurality of times within the time interval between the theoretical replacement time and the 1 st time of the current detection period are times when the adsorption capacity of the activated carbon filter for formaldehyde is not saturated yet, the average change rate of these times may represent the average speed of adsorption of formaldehyde by the activated carbon filter, i.e. the theoretical change rate.Is the difference between the preset concentration and the second concentration information,/>The ratio of the difference between the preset concentration and the second concentration information to the theoretical change rate indicates the length of time required for the formaldehyde concentration to drop from the second concentration information to the preset concentration, that is, the second expected duration, in other words, if the activated carbon filter is replaced in time once the activated carbon filter is saturated in its ability to adsorb formaldehyde, the length of time required for the formaldehyde concentration to drop from the second concentration information to the preset concentration is the second expected duration in this case. If the second expected time length is greater than or equal to the preset first time length threshold, the speed of filtering formaldehyde by only relying on the activated carbon filter is still low even if the activated carbon filter can be replaced in time, the formaldehyde concentration cannot be reduced to the preset concentration within the preset first time length threshold, and a chemical formaldehyde removal agent is required to be added into the air purification equipment, so that the formaldehyde concentration reduction speed is accelerated.
According to the method, the second expected duration can be determined according to the theoretical change rate and the second concentration information, and in the calculation process, the formaldehyde filtering speed under the condition that the activated carbon filter needs to be replaced is fully considered, so that the second expected duration for removing formaldehyde under the condition that the activated carbon filter needs to be replaced in time is determined, the scientificity and the accuracy of the second expected duration are improved, and a data basis is provided for determining whether the chemical formaldehyde removing agent needs to be added into the air purifying equipment.
According to one embodiment of the present invention, if the activated carbon filter needs to be replaced and the chemical formaldehyde removal agent needs to be added in step S105, the dosage of the chemical formaldehyde removal agent to be added and the number of the replaced activated carbon filters are determined according to the first concentration information, the second concentration information, the first cost information of the activated carbon filter, and the second cost information of the chemical formaldehyde removal agent, so that the cost of using the activated carbon filter and the chemical formaldehyde removal agent is reduced while ensuring the speed of removing formaldehyde.
According to one embodiment of the present invention, if the activated carbon filter needs to be replaced and the chemical formaldehyde removal agent needs to be added, determining the dosage of the chemical formaldehyde removal agent to be added and the number of the replaced activated carbon filters according to the first concentration information, the second concentration information, the first cost information of the activated carbon filter, and the second cost information of the chemical formaldehyde removal agent, includes: obtaining constraints of the dose prediction model according to formula (4),
（4）
Wherein N is the number of the replaced active carbon filters, D is the dosage of the chemical formaldehyde removing agent, V is the volume of the preset space,The dosage of the chemical formaldehyde-removing agent corresponding to formaldehyde with unit content,/>The theoretical replacement time; obtaining an objective function of the dose prediction model according to formulas (5) and (6),
（5）
（6）
Wherein,For the first cost information,/>For the second cost information,/>For presetting a first time length threshold,/>The 1 st moment in the current detection period;
And determining the number of the replaced active carbon filters and the dosage of the chemical formaldehyde removing agent according to the constraint condition and the objective function of the dosage prediction model.
According to one embodiment of the present invention, in equation (4),The change quantity of the formaldehyde concentration in the space is preset from the 1 st moment to the theoretical replacement moment in the current detection period,/>The product of the amount of change in the formaldehyde concentration in the preset space from the 1 st time to the theoretical replacement time in the current detection period and the volume of the preset space, that is, the amount of formaldehyde adsorbed by the activated carbon filter from the 1 st time to the theoretical replacement time in the current detection period, in other words, the weighted amount that a single activated carbon filter can adsorb in the case that the capacity of the activated carbon filter to adsorb formaldehyde is not saturated,Total amount of adsorbable formaldehyde for all activated carbon filters replaced,/>For the ratio of the dosage of the chemical formaldehyde-removing agent to the dosage of the chemical formaldehyde-removing agent corresponding to the unit content of formaldehyde, the amount of formaldehyde removable by the chemical formaldehyde-removing agent added is expressed,/>The product of the difference value between the second concentration information at the end time of the current detection period and the preset concentration and the volume of the preset space is used for representing the amount of formaldehyde to be removed in the preset space at the end time of the current detection period, and the constraint condition represented by the formula (4) is that the sum of the total amount of the adsorbable formaldehyde of all the replaced activated carbon filters and the total amount of the removable formaldehyde of the chemical formaldehyde removal agent is equal to the amount of the formaldehyde to be removed in the preset space at the end time of the current detection period, so that the formaldehyde concentration in the preset space can be reduced to the preset concentration by removing the formaldehyde according to the chemical formaldehyde removal agent and the activated carbon filter with the predicted dosage.
According to one embodiment of the present invention, in equation (5),For the duration from the 1 st time to the theoretical replacement time in the current detection period, namely, the required duration for an activated carbon filter to absorb formaldehyde to reach the saturation condition,For all the time required for the replacement of the activated carbon filter to absorb formaldehyde to reach the saturated condition, the chemical formaldehyde removing agent added into the air purifying equipment can be a solution type agent, formaldehyde-containing air can be introduced into the solution, and after the air flows through the solution, the formaldehyde can react with the agent in the solution and remove formaldehyde, so that the time required for the chemical formaldehyde removing agent to remove formaldehyde is negligible, and the time required for all the replacement of the activated carbon filter to absorb formaldehyde to reach the saturated condition is the formaldehyde removing treatment time. /(I)In order to obtain the difference between the formaldehyde removal treatment time and the preset first time threshold, the difference between the formaldehyde removal treatment time and the preset first time threshold is represented, and the objective function represented by the formula (5) is to minimize the difference between the formaldehyde removal treatment time and the preset first time threshold, so that the formaldehyde can be reduced to the preset concentration within the expected time, and more chemical formaldehyde removal agents are required to be used for removing the formaldehyde at a higher speed, which may cause cost increase, so that the formaldehyde removal treatment time is equal to the preset first time threshold.
According to one embodiment of the present invention, in equation (6),To replace the product of the number of activated carbon filters and the first cost information, representing the cost of replacing activated carbon filters,/>For the product of the dosage of the chemical formaldehyde-removing agent and the second cost information, the cost of adding the chemical formaldehyde-removing agent is represented, min is a minimum function, and the objective function represented by the formula (6) is a minimum value of the sum of the cost of replacing the activated carbon filter and the cost of adding the chemical formaldehyde-removing agent, so that the cost of removing formaldehyde according to the predicted dosage of the chemical formaldehyde-removing agent and the activated carbon filter is minimum.
According to one embodiment of the present invention, after the constraint conditions and the objective function are obtained, the dose of the chemical formaldehyde-removing agent and the number of the replaced activated carbon filters may be solved, an optimal solution satisfying the constraint conditions and achieving the objective described by the objective function as much as possible is obtained, and the optimal solution is taken as the dose of the chemical formaldehyde-removing agent added and the number of the replaced activated carbon filters. The solving process can be solved by using nonlinear programming, genetic algorithm and other modes, the invention is not limited to the above, and the number of the replaced activated carbon filters is a positive integer.
In this way, the constraint condition of the dosage prediction model can be obtained according to the second concentration information, the objective function of the dosage prediction model can be obtained according to the first cost information and the second cost information and the formaldehyde removal time, the dosage of the chemical formaldehyde removal agent predicted by the dosage prediction model and the number of the activated carbon filters can be ensured to reduce the formaldehyde concentration in the preset space to the preset concentration, the difference between the formaldehyde removal time and the preset first time threshold is minimized, the formaldehyde removal cost is minimized, the time required in the formaldehyde removal process is reduced, the formaldehyde removal efficiency is improved, and the formaldehyde removal cost is reduced.
According to one embodiment of the present invention, after a chemical formaldehyde-removing agent is added to the air cleaning apparatus and the activated carbon filter is replaced according to the dosage, the air cleaning apparatus is turned on and formaldehyde concentration information is continuously detected by the formaldehyde sensor in step S106.
According to one embodiment of the present invention, in step S107, after the air cleaning apparatus starts to operate, concentration information of formaldehyde is continuously detected, and when the concentration information of formaldehyde is lower than or equal to a preset standard concentration threshold value, the detection is stopped.
According to the formaldehyde detection method provided by the embodiment of the invention, the formaldehyde concentration in the preset space can be continuously detected, the mode of removing formaldehyde by the air purification equipment is optimized by utilizing the detected formaldehyde concentration, an accurate data basis is provided for the formaldehyde removal process, and the dosage of chemical formaldehyde removal agents and the accurate number of the replaced active carbon filters are determined. And after the formaldehyde removal mode is optimized, the formaldehyde concentration is continuously detected until the formaldehyde concentration reaches below a preset standard concentration threshold value, so that the formaldehyde removal effect can be determined by effectively utilizing the detection result of the formaldehyde concentration. The formaldehyde concentration detection result can be utilized to improve the formaldehyde removal efficiency and effect, and the formaldehyde concentration can be continuously detected, so that the formaldehyde concentration can be monitored accurately in real time, and an accurate data basis is provided for judging the formaldehyde removal effect. When judging whether to replace the activated carbon filter, the first condition judgment parameters under the condition that whether the adsorption capacity of the activated carbon filter to formaldehyde is saturated or not can be respectively determined through the condition function, and in the calculation process, the formaldehyde adsorption speed of the activated carbon filter is fully considered, so that the requirement of replacing the activated carbon filter is determined through the formaldehyde adsorption speed, and the judgment accuracy of replacing the activated carbon filter is improved. When the active carbon filter does not need to be replaced and whether the chemical formaldehyde removal agent needs to be added is determined, the first expected duration can be determined according to the average change rate and the second concentration information, and in the calculation process, the formaldehyde filtration speed under the condition that the active carbon filter does not need to be replaced is fully considered, so that the scientificity and the accuracy of the first expected duration are improved, and a data basis is provided for determining whether the chemical formaldehyde removal agent needs to be added in the air purification equipment. When the activated carbon filter needs to be replaced and whether the chemical formaldehyde removal agent needs to be added is determined, the second expected duration can be determined according to the theoretical change rate and the second concentration information, and in the calculation process, the formaldehyde filtration speed under the condition that the activated carbon filter needs to be replaced is fully considered, so that the second expected duration of the activated carbon filter for removing formaldehyde is determined under the condition that the activated carbon filter is replaced in time, the scientificity and the accuracy of the second expected duration are improved, and a data basis is provided for determining whether the chemical formaldehyde removal agent needs to be added in the air purification equipment. When determining the dosage of the chemical formaldehyde-removing agent and the number of the replaced activated carbon filters, the constraint condition of the dosage prediction model can be obtained according to the second concentration information, the objective function of the dosage prediction model can be obtained according to the first cost information and the second cost information and the formaldehyde removing time, the dosage of the chemical formaldehyde-removing agent predicted by the dosage prediction model and the number of the activated carbon filters can be ensured to be reduced to the preset concentration, the difference between the formaldehyde removing time and the preset first time threshold is minimized, the formaldehyde removing cost is minimized, the time required in the formaldehyde removing process is reduced, the formaldehyde removing efficiency is improved, and the formaldehyde removing cost is reduced.
Fig. 2 exemplarily shows a block diagram of a formaldehyde detection method according to an embodiment of the present invention, the system including:
The first concentration information module is used for detecting first concentration information of formaldehyde at the starting time of the current detection period through a formaldehyde sensor arranged in a preset space;
The first air purification module is used for starting air purification equipment to perform formaldehyde removal treatment in the current detection period if the first concentration information is greater than or equal to a first concentration threshold value, wherein the air purification equipment comprises an activated carbon filter for filtering and adsorbing formaldehyde;
The second concentration information module is used for acquiring second concentration information of formaldehyde in the preset space through the formaldehyde sensor at a plurality of moments of the current detection period;
The judging module is used for determining whether the activated carbon filter needs to be replaced or not and whether a chemical formaldehyde removing agent needs to be added into the air purifying equipment or not according to the first concentration information and the second concentration information;
if the equipment module is replaced and the active carbon filter needs to be replaced and the chemical formaldehyde removing agent needs to be added, determining the dosage of the chemical formaldehyde removing agent and the quantity of the replaced active carbon filter according to the first concentration information, the second concentration information, the first cost information of the active carbon filter and the second cost information of the chemical formaldehyde removing agent;
the second air purification module is used for starting the air purification equipment after adding a chemical formaldehyde removal agent into the air purification equipment according to the dosage and replacing an active carbon filter, and continuously detecting concentration information of formaldehyde through a formaldehyde sensor;
and finishing the detection module, and stopping detection when the concentration information of the formaldehyde is lower than or equal to a preset standard concentration threshold value.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.
Claims (8)
1. A formaldehyde detection method, comprising:
Detecting first concentration information of formaldehyde at the beginning time of a current detection period through a formaldehyde sensor arranged in a preset space;
If the first concentration information is greater than or equal to a first concentration threshold value, starting air purification equipment, and performing formaldehyde removal treatment in the current detection period, wherein the air purification equipment comprises an activated carbon filter for filtering and adsorbing formaldehyde;
acquiring second concentration information of formaldehyde in the preset space through a formaldehyde sensor at a plurality of moments of the current detection period;
determining whether an activated carbon filter needs to be replaced or not and whether a chemical formaldehyde removal agent needs to be added into air purification equipment or not according to the first concentration information and the second concentration information;
If the active carbon filter needs to be replaced and a chemical formaldehyde removing agent needs to be added, determining the dosage of the chemical formaldehyde removing agent and the quantity of the replaced active carbon filter according to the first concentration information, the second concentration information, the first cost information of the active carbon filter and the second cost information of the chemical formaldehyde removing agent;
after adding a chemical formaldehyde removing agent into the air purifying equipment according to the dosage and replacing an active carbon filter, starting the air purifying equipment, and continuously detecting concentration information of formaldehyde through a formaldehyde sensor;
stopping detection when the concentration information of formaldehyde is lower than or equal to a preset standard concentration threshold value;
determining whether an activated carbon filter needs to be replaced and whether a chemical formaldehyde removal agent needs to be added to an air cleaning device according to the first concentration information and the second concentration information, comprising:
Fitting the first concentration information, the second concentration information and the moment in the current detection period to obtain a first concentration function of formaldehyde concentration in the current detection period;
obtaining a first concentration derivative function according to the first concentration function;
Determining concentration change rates at a plurality of moments in a current detection period according to the first concentration derivative function;
Determining whether the activated carbon filter needs to be replaced according to the concentration change rate;
And determining whether a chemical formaldehyde removal agent is required to be added into the air purification equipment according to the first concentration information, the second concentration information and the concentration change rate.
2. The formaldehyde detection method according to claim 1, wherein determining whether replacement of an activated carbon filter is required based on the concentration change rate comprises:
Acquiring the concentration change rate of the 1 st to m th moments and the concentration change rate of the n-m+1 th to n th moments in the current detection period, wherein n is the number of the moments in each detection period, m is the preset number, m is less than n, and m and n are positive integers;
according to the formula
Determining a first condition discrimination parameterWherein/>For the i-th moment in the current detection cycle,/>For the concentration change rate at the ith moment in the current detection period,/>The method comprises the steps that if is a preset first change rate threshold value, and if is a conditional function;
And if the first condition discrimination parameter is smaller than or equal to the first condition threshold value, determining that the activated carbon filter needs to be replaced.
3. The formaldehyde detection method according to claim 2, wherein determining whether a chemical formaldehyde-removing agent is required to be added to an air purification apparatus based on the first concentration information, the second concentration information, and the concentration change rate, comprises:
If the activated carbon filter does not need to be replaced, determining the average change rate of formaldehyde concentration information in the current detection period according to the concentration change rate;
Determining whether a chemical formaldehyde removal agent needs to be added to the air purification device according to the average change rate and the second concentration information;
if the activated carbon filter needs to be replaced, determining the theoretical replacement time length of the activated carbon filter and the theoretical change rate of formaldehyde concentration information in the theoretical replacement time length according to the concentration change rate;
And determining whether a chemical formaldehyde-removing agent is required to be added into the air purifying equipment according to the theoretical replacement time length and the theoretical change rate.
4. The formaldehyde detection method according to claim 3, wherein determining whether a chemical formaldehyde-removing agent is required to be added to the air cleaning apparatus based on the average rate of change and the second concentration information, comprises:
according to the formula
Determining a first expected duration of time required for formaldehyde removal by an activated carbon filterWherein/>At a preset concentration,/>For the second concentration information at the end of the current detection period,/>Is the average rate of change;
And if the first expected time length is greater than or equal to a preset first time length threshold value, determining that a chemical formaldehyde removal agent needs to be added into the air purification equipment.
5. A formaldehyde detection method according to claim 3, wherein determining a theoretical replacement time period of the activated carbon filter and a theoretical rate of change of formaldehyde concentration information within the theoretical replacement time period based on the concentration rate of change if the activated carbon filter needs to be replaced, comprises:
determining the first moment that the absolute value of the concentration change rate is smaller than or equal to a preset second change rate threshold value in the current detection period as a theoretical replacement moment;
And determining an average value of concentration change rates at a plurality of moments in a time interval between the theoretical replacement moment and the 1 st moment of the current detection period as the theoretical change rate.
6. The formaldehyde detection method according to claim 5, wherein determining whether a chemical formaldehyde-removing agent is required to be added to an air cleaning apparatus based on the theoretical replacement time period and the theoretical change rate comprises:
according to the formula
Determining a second expected duration of time required for formaldehyde removal by the activated carbon filterWherein/>At a preset concentration,/>For the second concentration information at the end of the current detection period,/>Is the theoretical rate of change;
And if the second expected time length is greater than or equal to a preset first time length threshold value, determining that a chemical formaldehyde removal agent needs to be added into the air purification equipment.
7. The formaldehyde detection method according to claim 5, wherein if the activated carbon filter needs to be replaced and a chemical formaldehyde removal reagent needs to be added, determining a dosage of the chemical formaldehyde removal reagent to be added and a number of the activated carbon filters to be replaced based on the first concentration information, the second concentration information, the first cost information of the activated carbon filter, and the second cost information of the chemical formaldehyde removal reagent, comprises:
according to the formula
Obtaining constraint conditions of a dose prediction model, wherein N is the number of the replaced active carbon filters, D is the dose of the chemical formaldehyde removal agent, V is the volume of a preset space,The dosage of the chemical formaldehyde removing agent corresponding to formaldehyde with unit content,The theoretical replacement time;
according to the formula
An objective function of the dose prediction model is obtained, wherein,For the first cost information,/>For the second cost information,/>For presetting a first time length threshold,/>The 1 st moment in the current detection period;
And determining the number of the replaced active carbon filters and the dosage of the chemical formaldehyde removing agent according to the constraint condition and the objective function of the dosage prediction model.
8. A formaldehyde detection apparatus, comprising:
The first concentration information module is used for detecting first concentration information of formaldehyde at the starting time of the current detection period through a formaldehyde sensor arranged in a preset space;
The first air purification module is used for starting air purification equipment to perform formaldehyde removal treatment in the current detection period if the first concentration information is greater than or equal to a first concentration threshold value, wherein the air purification equipment comprises an activated carbon filter for filtering and adsorbing formaldehyde;
The second concentration information module is used for acquiring second concentration information of formaldehyde in the preset space through the formaldehyde sensor at a plurality of moments of the current detection period;
The judging module is used for determining whether the activated carbon filter needs to be replaced or not and whether a chemical formaldehyde removing agent needs to be added into the air purifying equipment or not according to the first concentration information and the second concentration information;
if the equipment module is replaced and the active carbon filter needs to be replaced and the chemical formaldehyde removing agent needs to be added, determining the dosage of the chemical formaldehyde removing agent and the quantity of the replaced active carbon filter according to the first concentration information, the second concentration information, the first cost information of the active carbon filter and the second cost information of the chemical formaldehyde removing agent;
the second air purification module is used for starting the air purification equipment after adding a chemical formaldehyde removal agent into the air purification equipment according to the dosage and replacing an active carbon filter, and continuously detecting concentration information of formaldehyde through a formaldehyde sensor;
The detection module is completed, and detection is stopped when the concentration information of formaldehyde is lower than or equal to a preset standard concentration threshold value;
determining whether an activated carbon filter needs to be replaced and whether a chemical formaldehyde removal agent needs to be added to an air cleaning device according to the first concentration information and the second concentration information, comprising:
Fitting the first concentration information, the second concentration information and the moment in the current detection period to obtain a first concentration function of formaldehyde concentration in the current detection period;
obtaining a first concentration derivative function according to the first concentration function;
Determining concentration change rates at a plurality of moments in a current detection period according to the first concentration derivative function;
Determining whether the activated carbon filter needs to be replaced according to the concentration change rate;
And determining whether a chemical formaldehyde removal agent is required to be added into the air purification equipment according to the first concentration information, the second concentration information and the concentration change rate.
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