Laboratory ventilation system and method

Abstract

The invention discloses a laboratory ventilation system and method, and relates to the field of ventilation management.The system comprises a daily ventilation module, an abnormal ventilation module and a filtering processing module, and the daily ventilation module is responsible for collecting laboratory environment information and analyzing the laboratory environment information based on an environment risk model; and the abnormal ventilation module is responsible for collecting laboratory air information and carrying out analysis based on a ventilation risk model so as to judge whether a ventilation mode of the laboratory needs to be replaced or not, and if the ventilation mode needs to be replaced, the system can collect pollution position information and analyze the pollution position information so as to obtain an abnormal ventilation scheme. The filtering processing module collects abnormal ventilation data according to the abnormal ventilation scheme, analyzes the abnormal ventilation data and finally gives an early warning according to an analysis result, the ventilation efficiency is improved, the safety of a laboratory is enhanced, and the ventilation cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of ventilation management, and in particular to a laboratory ventilation system and method. Background Art

[0002] Some chemical reagents and instruments used in laboratories may produce safety hazards such as harmful gases, smoke or explosions. At the same time, with the improvement of environmental awareness and the increasingly stringent environmental regulations, the environmental performance of laboratory ventilation systems has received more and more attention. Therefore, in order to discharge harmful gases and particles in time, a laboratory ventilation system and method are needed.

[0003] The existing technology is: using a variable air volume ventilation system, which can adjust the fan speed according to the feedback from the indoor pollutant concentration sensor or the wind speed sensor at the ventilation hood, thereby changing the ventilation volume, thereby introducing fresh air, and at the same time directing the exhaust gas to the filter module of the general treatment technology.

[0004] With regard to the existing technology, there are at least the following deficiencies: 1. The existing technology only sets the ventilation mode based on fixed standards or experience, and changes the wind speed according to the concentration of gaseous pollutants and polluted particles in the environment, but does not fully consider dynamic factors such as the production volume and generation frequency of various gaseous pollutants in each operating area of ​​the laboratory, as well as the usage volume and usage frequency of particulate pollutants. At the same time, in the ventilation design, it may only set a unified ventilation volume according to the overall purpose of the laboratory, without conducting a risk assessment on the specific pollution characteristics of different operating areas. It is impossible to analyze the environmental risks of each operating area and dynamically adjust the ventilation layout accordingly. The location of the staff is not analyzed, and the movement path of the gaseous pollutants and polluted particles cannot be changed. It is easy to direct the gaseous pollutants and polluted particles to the staff and precision instruments, causing safety hazards.

[0005] 2. When selecting a waste gas treatment scheme, the prior art does not fully consider the characteristics of different gaseous pollutants and particulate pollutants, as well as the filtering efficiency of different treatment schemes for various pollutants. It does not analyze the filtering efficiency of each waste gas treatment scheme for different pollutants to select the optimal waste gas treatment scheme. It only adopts a general waste gas treatment method, which is unable to achieve efficient treatment for the specific pollutant composition of the laboratory, reduces the service life of the filtration equipment, and increases the cost of waste gas treatment. At the same time, it does not monitor the filtering effect of the waste gas, which increases the safety hazard of waste gas discharge. Summary of the invention

[0006] In view of the above-mentioned technical deficiencies, the object of the present invention is to provide a laboratory ventilation system and method.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a laboratory ventilation system, comprising the following modules: a daily ventilation module, which is used to collect laboratory environmental information, analyze the laboratory environmental information based on the environmental risk model, and set a daily ventilation plan according to the analysis results.

[0008] The abnormal ventilation module is used to collect laboratory air information, analyze the laboratory air information based on the ventilation risk model, and determine whether the laboratory needs to change the ventilation mode based on the analysis results. When the ventilation mode needs to be changed, the pollution location information is collected and analyzed to obtain the abnormal ventilation plan.

[0009] The filtering and processing module is used to collect abnormal ventilation data according to the abnormal ventilation plan, analyze the abnormal ventilation data based on the filtering effect model, and issue an early warning based on the analysis results.

[0010] Preferably, the laboratory environmental information is analyzed, and the specific analysis process is as follows: the laboratory environmental information includes the production of various types of gaseous pollutants in each operating area, the generation frequency of various types of gaseous pollutants, the usage of various types of particulate pollutants and the usage frequency of various types of particulate pollutants. The production of various types of gaseous pollutants, the generation frequency of various types of gaseous pollutants, the usage of various types of particulate pollutants and the generation frequency of various types of particulate pollutants in each operating area are input into the environmental risk model to obtain the output results of each operating area. The numerical value r of the output result is the environmental risk level, r=1,2...u, u is the maximum environmental risk level.

[0011] The operating areas with environmental risk levels greater than the preset environmental risk levels are recorded as high-risk operating areas, and the operating areas with environmental risk levels less than or equal to the preset environmental risk levels are recorded as low-risk operating areas. In this way, high-risk operating areas and low-risk operating areas are obtained in the experiment, and corresponding air inlets are set in each high-risk area, and corresponding air outlets are set in each low-risk area.

[0012] The production volume of various types of gaseous pollutants in each operating area, the generation frequency of various types of gaseous pollutants, the usage of various types of particulate pollutants, and the generation frequency of various types of particulate pollutants are substituted into the pollutant risk calculation formula to obtain the pollution index of various gaseous pollutants and the pollution index of various types of particulate pollutants. The filtration treatment efficiency of various types of gaseous pollutants and the filtration treatment efficiency of various types of particulate pollutants of each exhaust gas treatment scheme are obtained from the database. The filtration treatment efficiency of various types of gaseous pollutants and various types of particulate pollutants of each exhaust gas treatment scheme are substituted into the pollution treatment efficiency index calculation formula to obtain the pollutant treatment index of each exhaust gas treatment scheme, and the exhaust gas treatment scheme with the largest pollutant treatment index is selected as the exhaust gas treatment scheme for the daily ventilation scheme.

[0013] The daily ventilation plan is: supply air at each air outlet in the laboratory, exhaust the air into the air inlet, and the exhaust gas passes through the filter duct corresponding to the exhaust gas treatment plan and is sent into the laboratory from the return air outlet.

[0014] On the other hand, the present invention provides a laboratory ventilation method, comprising the following steps: a daily ventilation module, for collecting laboratory environmental information, analyzing the laboratory environmental information based on an environmental risk model, and setting a daily ventilation plan according to the analysis results.

[0015] The abnormal ventilation module is used to collect laboratory air information, analyze the laboratory air information based on the ventilation risk model, and determine whether the laboratory needs to change the ventilation mode based on the analysis results. When the ventilation mode needs to be changed, the pollution location information is collected and analyzed to obtain the abnormal ventilation plan.

[0016] The filtering and processing module is used to collect abnormal ventilation data according to the abnormal ventilation plan, analyze the abnormal ventilation data based on the filtering effect model, and issue an early warning based on the analysis results.

[0017] The beneficial effects of the present invention are as follows: 1. The present invention firstly has a daily ventilation module responsible for collecting laboratory environmental information and analyzing it based on an environmental risk model, thereby setting a daily ventilation plan according to the analysis results. The abnormal ventilation module is responsible for collecting laboratory air information and analyzing it based on a ventilation risk model to determine whether the laboratory needs to change the ventilation mode. If the ventilation mode needs to be changed, the system will collect and analyze the pollution location information to obtain an abnormal ventilation plan. The filtering processing module will collect abnormal ventilation data according to the abnormal ventilation plan, analyze the abnormal ventilation data, and finally issue an early warning according to the analysis results. The present invention improves ventilation efficiency, strengthens the safety of the laboratory, and reduces ventilation costs.

[0018] 2. The present invention sets daily ventilation plans and abnormal ventilation plans. Through the daily ventilation plan, a low-speed ventilation plan is used to accelerate the air circulation in the laboratory, which can effectively reduce the hazards caused by long-term exposure to a low-concentration harmful gas environment. At the same time, through low-speed air, during the operation of solid powders, that is, during weighing, grinding or distribution, small solid particles in the air can be removed in time to avoid the powder reducing the accuracy of the instrument and avoiding harmful substances from being inhaled by experimenters and causing harm. Finally, harmless but irritating gases can be removed in time to reduce the probability of experimenters smelling odors and increase user satisfaction.

[0019] 3. The exhaust gas treatment channel of the present invention is composed of various filter screens. By switching the pipes, the effect of using different pipes is achieved. Different pipes are targeted at different exhaust gases, and the filtering effects on the exhaust gases are inconsistent. Therefore, when identifying the type of exhaust gas, different pipes can be used to use high-efficiency filter screens instead of low-efficiency filter screens. This can effectively improve the filtering efficiency of the filter screen, while avoiding the use of low-efficiency filtering equipment and increasing the life of the filtering equipment. On the other hand, during the use of the filter screen, the gas data before and after the filtering of the filter screen is monitored in time. When the filtering equipment failure is analyzed, the filtering function is turned off in time to avoid leakage of harmful gases caused by the filtering equipment failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the connection of the system modules of the present invention.

[0022] Figure 2 The present invention is a schematic flow chart of the steps for implementing the method. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] according to Figure 1 As shown, the present invention provides a laboratory ventilation system, comprising the following modules: a daily ventilation module, an abnormal ventilation module, a filtering and processing module and a database.

[0025] The abnormal ventilation module is connected to the filtering and processing module and the daily ventilation module respectively, and the daily ventilation module, the abnormal ventilation module and the filtering and processing module are all connected to the database.

[0026] The daily ventilation module is used to collect laboratory environmental information, analyze the laboratory environmental information based on the environmental risk model, and set up daily ventilation plans based on the analysis results.

[0027] In a specific embodiment, the laboratory environment information is collected, and the specific collection process is as follows: the laboratory environment information includes the production of various types of gaseous pollutants in each operating area, the generation frequency of various types of gaseous pollutants, the usage of various types of particulate pollutants and the usage frequency of various types of particulate pollutants. The production of various types of gaseous pollutants is collected by gas chromatography-mass spectrometry. At the same time, with the help of the operation recording function of the experimental equipment, the experimental operation time and frequency of each generation of gaseous pollutants are counted to obtain the generation time and frequency of various types of gaseous pollutants. The generation frequency of various types of gaseous pollutants is divided by the corresponding time to obtain the generation frequency of various types of gaseous pollutants. At the same time, the single maximum generation time of various types of gaseous pollutants is obtained from the experimental operation time of each generation of gaseous pollutants.

[0028] Through the operation record function of the experimental equipment, the usage, operation time and frequency of each solid are counted, and the particle generation rate corresponding to each solid is obtained from the database. The usage of each solid is multiplied by the corresponding particle generation rate to obtain the usage of each type of particulate pollutants. At the same time, the frequency of each solid is divided by the experimental operation time to obtain the usage frequency of the particles corresponding to each solid, that is, the usage frequency of each type of particulate pollutants. At the same time, the maximum single usage time of the particles corresponding to each solid is obtained from the operation time of each use of the solid, so as to obtain the maximum single usage time of each type of particulate pollutants.

[0029] In a specific embodiment, the laboratory environmental information is analyzed, and the specific analysis process is as follows: the laboratory environmental information includes the production of various types of gaseous pollutants in each operating area, the generation frequency of various types of gaseous pollutants, the usage of various types of particulate pollutants and the usage frequency of various types of particulate pollutants. The production of various types of gaseous pollutants, the generation frequency of various types of gaseous pollutants, the usage of various types of particulate pollutants and the generation frequency of various types of particulate pollutants in each operating area are input into the environmental risk model to obtain the output results of each operating area. The numerical value r of the output result is the environmental risk level, r=1,2...u, u is the maximum environmental risk level.

[0030] The operating areas with environmental risk levels greater than the preset environmental risk levels are recorded as high-risk operating areas, and the operating areas with environmental risk levels less than or equal to the preset environmental risk levels are recorded as low-risk operating areas. In this way, high-risk operating areas and low-risk operating areas are obtained in the experiment, and corresponding air outlets are set in each high-risk area, and corresponding air inlets are set in each low-risk area.

[0031] It should be noted that the air outlet uses a liquid tank to seal the high-efficiency air supply outlet equipment.

[0032] The maximum production area of ​​each type of gaseous pollutants and the maximum use time of each type of particulate pollutants are obtained from the database. At the same time, the production of each type of gaseous pollutants and the use of each type of particulate pollutants in each operation area are averaged to obtain the average production of each type of gaseous pollutants and the average use of each type of particulate pollutants. The maximum production area of ​​each type of gaseous pollutants, the maximum use time of each type of particulate pollutants, the average production of each type of gaseous pollutants and the average use of each type of particulate pollutants are substituted into the corresponding pollutant risk calculation formula to obtain the pollution index of each type of gaseous pollutants and the pollution index of each type of particulate pollutants. According to the pollution index of each type of gaseous pollutants and the pollution index of each type of particulate pollutants, weights are assigned to obtain the weight factors of each type of gaseous pollutants and the weight factors of each type of particulate pollutants of each exhaust gas treatment scheme. The filtration treatment efficiency of each type of gaseous pollutants and the filtration treatment efficiency of each type of particulate pollutants of each exhaust gas treatment scheme are obtained from the database, and the pollutant treatment index of each exhaust gas treatment scheme is obtained. The exhaust gas treatment scheme with the maximum pollutant treatment index is selected as the exhaust gas treatment scheme for the daily ventilation scheme.

[0033] It should be noted that the pollutant risk calculation formula includes the gaseous pollutant calculation formula and the particle calculation formula. The pollutant calculation formula is: Gaseous pollutant calculation formula:

[0034] Among them, α′ b is the pollution index of the b-th type of gaseous pollutants, b is the number of each type of gaseous pollutants, and the value of b is a positive integer. G″ b and M″ b are the average production and maximum production area of ​​the b-th type of gaseous pollutants, G′ b and M′ b are the preset standard production volume and standard production area of ​​the b-th type gaseous pollutants, ζ1 and ζ2 are the preset weight factors of production volume and production area, ζ1>0, ζ2>0, ζ1+ζ2=1, and the particle pollutant calculation formula is:

[0035] Among them, α″ c is the pollution index of the c-th type of particle pollutant, c is the number of each type of particle pollutant, and the value of c is a positive integer. G″ c and T″ c are the average usage and maximum usage duration of the c-th type of particulate pollutants, G′ c and T′ c are the preset standard usage amount and standard usage time of Class C particulate pollutants respectively, ψ1 and ψ2 are the weight factors of the preset usage amount and usage time respectively, ψ1>0, ψ2>0, ψ1+ψ2=1.

[0036] At the same collection time, the collection points where the concentration of a gaseous pollutant is greater than the preset concentration are recorded as the exposure collection points of the gaseous pollutant, so as to obtain the number of exposure collection points of the gaseous pollutant at the target collection time, and multiply the number of exposure collection points of the gaseous pollutant at the target collection time by the area of ​​the collection points to obtain the production area of ​​the gaseous pollutant at the target collection time, so as to obtain the production area of ​​each gaseous pollutant at each collection time, and obtain the maximum production area of ​​each gaseous pollutant.

[0037] G′ b is the standard production of Class B gaseous pollutants, which is the production threshold of Class B gaseous pollutants in normal air. When the average production of gaseous pollutants exceeds G′ b When , it indicates that the laboratory's Class B gaseous pollutants exceed the standard, and the weight of filtering Class B gaseous pollutants in the filtration equipment is increased. The setting process of ζ1 and ζ2 is related to the production rate of gaseous pollutants. The smaller the production rate of gaseous pollutants, the larger ζ2 is. The larger the production rate of gaseous pollutants, the larger ζ1 is. Similarly, the standard parameter M″ b , G′ c and T′ c The setting process and standard parameter G′ b The setting process is the same as M″ b =1.7, G′ c is 0.8, T′ c is 1.3, and the setting process of the weight factors ψ1 and ψ2 is the same as the setting process of the weight factor ζ1, for example, ψ1 is 0.3 and ψ2 is 0.7.

[0038] The daily ventilation plan is: supply air at each air inlet in the laboratory, exhaust the air into the air outlet, and the exhaust gas passes through the filter duct corresponding to the exhaust gas treatment plan and is sent into the laboratory from the return air outlet.

[0039] It should be noted that the exhaust wind speed and filtration scheme are divided into three layers, namely the pre-filtration layer, the medium-efficiency filtration layer and the high-efficiency filtration layer. Each layer has different filtration equipment, which are connected by pipes. When using the corresponding filtration equipment, open the ventilation duct of the corresponding filtration equipment to achieve high-efficiency filtration every time the filtration equipment is used, thereby increasing the service life of the filtration equipment.

[0040] The daily ventilation plan is: supply air at each air outlet in the laboratory, exhaust the air into the air inlet, and the exhaust gas passes through the filter duct corresponding to the exhaust gas treatment plan and is sent into the laboratory from the return air outlet.

[0041] It should be noted that the daily ventilation wind speed is the preset daily ventilation wind speed. The required ventilation wind speed corresponding to the maximum pollution index gaseous pollutants and the required ventilation wind speed corresponding to the maximum pollution index particulate pollutants are obtained from the database, and the maximum required ventilation wind speed between the two is recorded as the preset daily ventilation wind speed.

[0042] In a specific embodiment, the environmental risk model expression is:

[0043] Among them, A a is the output result of the a-th operation area, a is the number of each operation area, and the value of a is a positive integer. G′ ab and E′ ab are the production and generation frequency of the b-type gaseous pollutants in the a-th operation area, G″ ac and E″ ac are the usage and usage frequency of the cth type of particle pollutant in the ath operation area, cc is the number of each type of particle pollutant, the value of c is a positive integer, G′, E′, G″ and E″ are the preset standard gaseous pollutant production, standard gaseous pollutant generation frequency, standard particle pollutant usage and standard particle pollutant usage frequency, ε1 and ε2 are the preset gas pollution weight factor and solid pollution weight factor, ε1>0, ε2>0, ε1+ε2=1, M1, M r-1 、M r and M u-1 They are respectively the preset first environmental risk index, the r-1th environmental risk index, the rth environmental risk index and the u-1th environmental risk index.

[0044] It should be noted that the standard parameters G′, E′, G″, E″, M1, M r-1 、M r and M u-1 The setting process and standard parameter G′ b The setting process is the same, for example, G′ is 0.6, E′ is 0.53, G″ is 0.27, E″ is 0.13, M1 is 0.3, M r-1 1.6, M r 1.7, M u-1 is 3.5, and the setting process of weight factors ε1 and ε2 is the same as that of weight factor ζ1, for example, ε1 is 0.45 and ε2 is 0.55.

[0045] The abnormal ventilation module is used to collect laboratory air information, analyze the laboratory air information based on the ventilation risk model, and determine whether the laboratory needs to change the ventilation mode based on the analysis results. When the ventilation mode needs to be changed, the pollution location information is collected and analyzed to obtain the abnormal ventilation plan.

[0046] In a specific embodiment, the laboratory air information is collected, and the specific collection process is as follows: the laboratory air information includes the concentration of various gaseous pollutants, the concentration of various particulate pollutants, the temperature and pressure of each collection point. The concentration of gaseous pollutants and the concentration of particulate pollutants are collected by a gas chromatograph-mass spectrometer at each collection point to obtain the concentration of various gaseous pollutants and the concentration of various particulate pollutants at each collection point. The temperature and pressure are collected by a thermometer and a Pitot tube pressure measuring device at each collection point to obtain the temperature and pressure of each collection point.

[0047] It should be noted that the pressure is the pressure of the flowing air. The higher the temperature and pressure of the target area, the larger the air affected area of ​​the target area.

[0048] In a specific embodiment, the laboratory air information is analyzed, and the specific analysis process is as follows: the concentration of various gaseous pollutants, the concentration of various particulate pollutants, the temperature, and the pressure of each collection point are input into the environmental risk model, and the output results of each collection point in each operating area are obtained, and the values ​​include 0 and 1.

[0049] If the output result of a certain collection point is 0, it indicates that there is no abnormality in the collection point, and the normal collection points are obtained. If the output result of a certain collection point is 1, it indicates that the collection point is abnormal, and the abnormal collection points are obtained. If all the collection points in the laboratory are normal collection points, it indicates that the laboratory does not need to change the ventilation. If there are abnormal collection points in the laboratory, it indicates that the laboratory needs to change the ventilation mode.

[0050] In a specific embodiment, the ventilation risk model expression is:

[0051] Among them, B d is the output result of the dth collection point, d is the number of each collection point, the value of d is a positive integer, D′ db is the concentration of the b-th type of gaseous pollutant at the d-th collection point, D″ dc is the concentration of the cth type of particulate pollutant at the dth collection point, T′ d and P′ d are the temperature and pressure of the preset dth collection point, D′ b is the preset standard concentration of the b-type gaseous pollutant, D″ c is the preset standard concentration of the c-th type of particle pollutants, T′ and P′ are the preset standard temperature and standard pressure respectively, φ b is the preset weight factor of the b-th type of gaseous pollutants, φ b >0, is the preset weight factor of the c-th type of particle pollutants, λ1 and λ2 are respectively the preset weight factors of temperature and pressure, λ1>0, λ2>0, λ1+λ2=1, and N is the preset standard ventilation risk index.

[0052] It should be noted that the standard parameters G′, E′, G″, E″, M1, M r-1 、M r and M u-1 The setting process and standard parameter G′ b The setting process is the same, for example, G′ is 0.6, E′ is 0.53, G″ is 0.27, E″ is 0.13, M1 is 0.3, M r-1 1.6, M r 1.7, M u-1 is 3.5, the weight factor The process of setting λ1 and λ2 is the same as that of setting the weight factor ζ1, for example is 0.45, λ1 is 0.46 and λ2 is 0.54.

[0053] In a specific embodiment, the pollution location information is collected, and the specific collection process is as follows: the pollution location information includes the length of each air inlet from each abnormal collection point and the length from each operator. The laboratory image is collected by a camera, and the length of each air inlet from each abnormal collection point and the length from each operator are obtained using image recognition technology.

[0054] In a specific embodiment, the pollution location information is analyzed, and the specific analysis process is as follows: the length of each air inlet from each abnormal collection point and the length from each operator are substituted into the air inlet usage index calculation formula: The usage index C of the xth air inlet is obtained g , g is the number of each air inlet, the value of g is a positive integer, where e is a natural constant, L′ gx is the distance between the g-th air inlet and the x-th abnormal collection point, x is the number of each abnormal collection point, x=1,2……i, i>2, L″ gy is the length from the g-th air inlet to the y-th operator, y is the number of each operator, y=1,2…j, j>2, L″ and L″ are the preset standard length from the abnormal collection point and the standard length from the operator respectively, θ1 and θ2 are the weight factors of the preset length from the abnormal collection point and the weight factor of the length from the operator respectively, θ1>0, θ2>0, θ1+θ2=1, and the air inlets with a usage index greater than the preset index are recorded as the air inlets to be used.

[0055] It should be noted that the setting process of the standard parameters L″ and L″ is the same as that of the standard parameter G′ bThe setting process of is the same as that of weight factor ζ1, for example, L″ is 2.3 and L″ is 7.6, and the setting process of weight factors θ1 and θ2 is the same as that of weight factor ζ1, for example, θ1 is 0.3 and θ2 is 0.7.

[0056] The position data of each air inlet to be used is obtained from the database, and each air inlet to be used is vectorized to obtain a position vector set of the air inlets. The cosine similarity of the position vector set of the air inlets and the position vector set corresponding to each preset ventilation scheme in the database is calculated to obtain the similarity of each preset ventilation scheme, and the air inlets of the preset ventilation scheme with the maximum similarity are recorded as the air inlets of the abnormal ventilation scheme. At the same time, according to the analysis process of the exhaust gas treatment scheme in the daily ventilation scheme, the exhaust gas treatment scheme of the abnormal ventilation scheme is analyzed and obtained.

[0057] The abnormal ventilation plan is: in the daily ventilation plan, each air outlet and the air outlet corresponding to each abnormal collection point supply air, and exhaust the air into the air inlet of the exhaust gas treatment plan. The exhaust gas passes through the filter duct of the exhaust gas treatment plan of the abnormal ventilation plan and is sent into the laboratory through the return air port.

[0058] It should be noted that the pollution index of various gaseous pollutants and the pollution index of various particulate pollutants during abnormal ventilation are calculated through the pollutant risk calculation formula in the daily ventilation plan. According to the required ventilation wind speed corresponding to each gaseous pollution index and the required ventilation wind speed corresponding to each particulate pollution index in the database, the required ventilation wind speed for various gaseous pollutants and the required ventilation wind speed for various particulate pollutants during abnormal ventilation are obtained, and the maximum required ventilation wind speed is selected as the wind speed for abnormal ventilation.

[0059] The filtering and processing module is used to collect abnormal ventilation data according to the abnormal ventilation plan, analyze the abnormal ventilation data based on the filtering effect model, and issue an early warning based on the analysis results.

[0060] In a specific embodiment, the abnormal ventilation data is collected, and the specific collection process is as follows: the abnormal ventilation data includes the concentration change rate of various gaseous pollutants in the current abnormal ventilation scheme, the current concentration change rate of various particulate pollutants, the historical daily use time of each filtering device and the historical abnormal use time of each filtering device. The concentration of gaseous pollutants and the concentration of particulate pollutants are collected by gas chromatography-mass spectrometry at two points before and after the filtration channel to obtain the concentration of various gaseous pollutants before filtration, the concentration of various gaseous pollutants after filtration, the concentration of various particulate pollutants before filtration and the concentration of various gaseous pollutants after filtration.

[0061] The concentration change rate of each type of gaseous pollutant is obtained by subtracting the difference between the concentration of each type of gaseous pollutant before filtration and the corresponding concentration after filtration, and dividing it by the corresponding concentration before filtration. If the concentration change rate of a certain type of gaseous pollutant is less than or equal to the preset gaseous change rate, the change rate of this type of gaseous pollutant is recorded as the preset gaseous change rate, and the preset gaseous change rate is greater than zero. Similarly, the concentration change rate of each type of particulate pollutant before filtration is subtracted from the difference between the concentration of the corresponding concentration after filtration and divided by the corresponding concentration before filtration. If the concentration change rate of a certain type of particulate pollutant is less than or equal to the preset particle change rate, the change rate of this type of particle pollutant is recorded as the preset particle change rate, and the preset particle change rate is greater than zero, thereby obtaining the concentration change rate of each type of gaseous pollutant and the current concentration change rate of each type of particulate pollutant.

[0062] When using the daily ventilation plan, record the usage time of each filtering device for daily use, and obtain the historical daily usage time of each filtering device. When using the abnormal ventilation plan, record the usage time of each filtering device for abnormal use, and obtain the historical abnormal usage time of each filtering device.

[0063] In a specific embodiment, the early warning is performed, and the specific early warning process is as follows: the concentration change rate of each type of gaseous pollutants in the current ventilation abnormality scheme, the current concentration change rate of each type of particulate pollutants, the historical daily use time of each filtering device and the historical abnormal use time of each filtering device are input into the filtering effect model to obtain the output result, and the output result value includes 0 and 1.

[0064] If the output result is 0, close the return air outlet and direct the exhaust gas to the exhaust gas channel that is not currently in use by the filtering device, issue an early warning, and prompt the staff to perform maintenance. If the output result is 1, it indicates that there is no abnormality in the filtering device.

[0065] In a specific embodiment, the filtering effect model expression is:

[0066]

[0067] Among them, H is the output result, V′ b is the concentration change rate of the b-type gaseous pollutant, V″ c is the concentration change rate of the c-th type of particle pollutants, K′ f and K′ fare the historical daily use time and historical abnormal use time of the f-th filter device, f is the number of each filter device, f=1,2…w, w>2, the value of w is the total number of filter device types 1, V′, V″, K′ and K″ are the preset standard gas concentration change rate, standard particle concentration change rate, standard daily use time and standard abnormal use time, ω1 and ω2 are the weight factors of the actual state and the weight factors of the service life, ω1>0, ω2>0, ω1+ω2=1, and Q is the preset standard filtration effect evaluation index.

[0068] It should be noted that the setting process of standard parameters V′, V″, K′, K″ and Q is the same as that of standard parameters G′ b The setting process of weight factors ω1 and ω2 is the same as that of weight factor ζ1, for example, ε1 is 0.45 and ε2 is 0.55.

[0069] The database is used to store the filtration treatment efficiency of various gaseous pollutants of each exhaust gas treatment scheme, the filtration treatment efficiency of various particulate pollutants of each exhaust gas treatment scheme, the position data of each air inlet and the position vector set of each ventilation outlet corresponding to each preset ventilation scheme.

[0070] according to Figure 2 As shown, the present invention provides a laboratory ventilation method, comprising the following steps: a daily ventilation module, used to collect laboratory environmental information, analyze the laboratory environmental information based on an environmental risk model, and set a daily ventilation plan according to the analysis results.

[0071] The abnormal ventilation module is used to collect laboratory air information, analyze the laboratory air information based on the ventilation risk model, and determine whether the laboratory needs to change the ventilation mode based on the analysis results. When the ventilation mode needs to be changed, the pollution location information is collected and analyzed to obtain the abnormal ventilation plan.

[0072] The filtering and processing module is used to collect abnormal ventilation data according to the abnormal ventilation plan, analyze the abnormal ventilation data based on the filtering effect model, and issue an early warning based on the analysis results.

[0073] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined in this specification, they shall all fall within the protection scope of the present invention.

Claims

1. A laboratory ventilation system, characterized in that: Includes the following modules: Daily ventilation module, which is used to collect laboratory environmental information, analyze the laboratory environmental information based on the environmental risk model, and set up daily ventilation plans according to the analysis results; The abnormal ventilation module is used to collect laboratory air information, analyze the laboratory air information based on the ventilation risk model, and determine whether the laboratory needs to change the ventilation mode based on the analysis results. If the ventilation mode needs to be changed, the pollution location information is collected and analyzed to obtain the abnormal ventilation plan; The filtering and processing module is used to collect abnormal ventilation data according to the abnormal ventilation plan, analyze the abnormal ventilation data based on the filtering effect model, and issue an early warning based on the analysis results.

2. A laboratory ventilation system according to claim 1, characterized in that: The laboratory environment information is analyzed, and the specific analysis process is as follows: Laboratory environmental information includes the production of various types of gaseous pollutants in each operating area, the generation frequency of various types of gaseous pollutants, the usage of various types of particle pollutants and the usage frequency of various types of particle pollutants, the single maximum generation time of various types of gaseous pollutants and the single maximum usage time of various types of particle pollutants. The production of various types of gaseous pollutants, the generation frequency of various types of gaseous pollutants, the usage of various types of particle pollutants and the production frequency of various types of particle pollutants in each operating area are input into the environmental risk model to obtain the output results of each operating area. The value r of the output result is the environmental risk level, r=1,2...u, u is the maximum environmental risk level; The operating area with an environmental risk level greater than the preset environmental risk level is recorded as a high-risk operating area, and the operating area with an environmental risk level less than or equal to the preset environmental risk level is recorded as a low-risk operating area, thereby obtaining the high-risk operating areas and low-risk operating areas in the experiment, setting the corresponding air outlet in each high-risk area, and setting the corresponding air inlet in each low-risk area; Substitute the production volume of various gaseous pollutants, the generation frequency of various gaseous pollutants, the usage volume of various particulate pollutants and the usage frequency of various particulate pollutants, the single maximum generation time of various gaseous pollutants and the single maximum usage time of various particulate pollutants into the corresponding pollutant risk calculation formula to obtain the pollution index of various gaseous pollutants and the pollution index of various particulate pollutants, obtain the filtration treatment efficiency of various gaseous pollutants and the filtration treatment efficiency of various particulate pollutants of each exhaust gas treatment scheme from the database, substitute the filtration treatment efficiency of various gaseous pollutants and various particulate pollutants of each exhaust gas treatment scheme into the pollution treatment efficiency index calculation formula to obtain the pollutant treatment index of each exhaust gas treatment scheme, and select the exhaust gas treatment scheme with the maximum pollutant treatment index as the exhaust gas treatment scheme of the daily ventilation scheme; The daily ventilation plan is: supply air at each air inlet in the laboratory, exhaust the air into the air outlet, and the exhaust gas passes through the filter duct corresponding to the exhaust gas treatment plan and is sent into the laboratory from the return air outlet.

3. A laboratory ventilation system according to claim 2, characterized in that: The environmental risk model expression is: ， Among them, Aa is the output result of the a-th operation area, a is the number of each operation area, the value of a is a positive integer, G′ ab and E′ ab are the production and generation frequency of the bth type of gaseous pollutants in the ath operation area, b is the number of each type of gaseous pollutant, and the value of b is a positive integer. G″ ac and E″ ac are the usage and usage frequency of the cth type of particle pollutant in the ath operation area, c is the number of each type of particle pollutant, and the value of c is a positive integer. G′, E′, G″ and E″ are the preset standard gaseous pollutant production, standard gaseous pollutant generation frequency, standard particle pollutant usage and standard particle pollutant usage frequency, ε1 and ε2 are the preset gas pollution weight factor and solid pollution weight factor, ε1>0, ε2>0, ε1+ε2=1, M1, M r-1 、M r and M u-1 They are respectively the preset first environmental risk index, the r-1th environmental risk index, the rth environmental risk index and the u-1th environmental risk index.

4. A laboratory ventilation system according to claim 2, characterized in that: The laboratory air information is analyzed, and the specific analysis process is as follows: Laboratory air information includes the concentration of various gaseous pollutants, the concentration of various particle pollutants, the temperature and the pressure at each collection point. The concentration of various gaseous pollutants, the concentration of various particle pollutants, the temperature and the pressure at each collection point are input into the environmental risk model, and the output values ​​of each collection point in each operating area include 0 and 1; If the output result of a certain collection point is 0, it indicates that there is no abnormality in the collection point, and the normal collection points are obtained. If the output result of a certain collection point is 1, it indicates that the collection point is abnormal, and the abnormal collection points are obtained. If all the collection points in the laboratory are normal collection points, it indicates that the laboratory does not need to change the ventilation. If there are abnormal collection points in the laboratory, it indicates that the laboratory needs to change the ventilation mode.

5. A laboratory ventilation system according to claim 4, characterized in that: The ventilation risk model expression is: ， Among them, B d is the output result of the dth collection point, d is the number of each collection point, the value of d is a positive integer, D′ db is the concentration of the b-th type of gaseous pollutant at the d-th collection point, D″ dc is the concentration of the cth type of particulate pollutant at the dth collection point, T′ d and P′ d are the temperature and pressure of the preset dth collection point, D′ b is the preset standard concentration of the b-type gaseous pollutant, D″ c is the preset standard concentration of the c-th type of particle pollutants, T′ and P′ are the preset standard temperature and standard pressure respectively, φ b is the preset weight factor of the b-th type of gaseous pollutants, φ b >0, is the preset weight factor of the c-th type of particle pollutants, λ1 and λ2 are respectively the preset weight factors of temperature and pressure, λ1>0, λ2>0, λ1+λ2=1, and N is the preset standard ventilation risk index.

6. A laboratory ventilation system according to claim 4, characterized in that: The pollution location information is analyzed, and the specific analysis process is as follows: The pollution location information includes the distance between the air inlet and each abnormal collection point and the distance between the air inlet and each operator. Substitute it into the air inlet usage index calculation formula: The usage index C of the xth air inlet is obtained g , g is the number of each air inlet, the value of g is a positive integer, where e is a natural constant, L′ gx is the distance between the g-th air inlet and the x-th abnormal collection point, x is the number of each abnormal collection point, x=1,2......i, i>2, L″ gy is the distance between the g-th air inlet and the y-th operator, y is the number of each operator, y=1,2...j, j>2, L′ and L″ are respectively the preset standard distance to the abnormal acquisition point length and the standard distance to the operator, θ1 and θ2 are respectively the weight factors of the preset distance to the abnormal acquisition point length and the weight factor of the distance to the operator, θ1>0, θ2>0, θ1+θ2=1, and each air inlet with a usage index greater than the preset index is recorded as each air inlet to be used; The position data of each air inlet to be used is obtained from the database, and each air inlet to be used is vectorized to obtain a position vector set of the air inlets. The cosine similarity of the position vector set of the air inlets and the position vector set corresponding to each preset ventilation scheme in the database is calculated to obtain the similarity of each preset ventilation scheme, and the air inlets of the preset ventilation scheme with the maximum similarity are recorded as the air inlets of the abnormal ventilation scheme. At the same time, according to the analysis process of the exhaust gas treatment scheme in the daily ventilation scheme, the exhaust gas treatment scheme of the abnormal ventilation scheme is analyzed and obtained.

7. A laboratory ventilation system according to claim 6, characterized in that: The specific early warning process is as follows: The abnormal ventilation data includes the concentration change rates of various gaseous pollutants in the current abnormal ventilation plan, the current concentration change rates of various particulate pollutants, the historical daily use time of each filtering device and the historical abnormal use time of each filtering device. The concentration change rates of various gaseous pollutants in the current abnormal ventilation plan, the current concentration change rates of various particulate pollutants, the historical daily use time of each filtering device and the historical abnormal use time of each filtering device are input into the filtration effect model to obtain the output results, and the output results have values ​​including 0 and 1. If the output result is 0, close the return air outlet and direct the exhaust gas to the exhaust gas channel that is not currently in use by the filtering device, issue an early warning, and prompt the staff to perform maintenance. If the output result is 1, it indicates that there is no abnormality in the filtering device.

8. A laboratory ventilation system according to claim 7, characterized in that: The filtering effect model expression is: ， Among them, H is the output result, V′ b is the concentration change rate of the b-type gaseous pollutant, V″ c is the concentration change rate of the c-th type of particulate pollutants, K′ f and K″ f are the historical daily use time and historical abnormal use time of the f-th filter device respectively, f is the number of each filter device, f=1,2...w, w>2, the value of w is the total number of filter device types 1, V′, V″, K′ and K″ are the preset standard gas concentration change rate, standard particle concentration change rate, standard daily use time and standard abnormal use time respectively, ω1 and ω2 are the weight factors of the actual state and the weight factors of the service life respectively, ω1>0, ω2>0, ω1+ω2=1, and Q is the preset standard filtration effect evaluation index.

9. A laboratory ventilation system according to claim 1, characterized in that: It also includes a database for storing the filtration treatment efficiency of various gaseous pollutants of each exhaust gas treatment scheme, the filtration treatment efficiency of various particulate pollutants of each exhaust gas treatment scheme, the position data of each air outlet and the position vector set of each ventilation outlet corresponding to each preset ventilation scheme.

10. A laboratory ventilation method using the laboratory ventilation system according to any one of claims 1 to 9, characterized in that: The steps include: Daily ventilation module, which is used to collect laboratory environmental information, analyze the laboratory environmental information based on the environmental risk model, and set up daily ventilation plans according to the analysis results; The abnormal ventilation module is used to collect laboratory air information, analyze the laboratory air information based on the ventilation risk model, and determine whether the laboratory needs to change the ventilation mode based on the analysis results. If the ventilation mode needs to be changed, the pollution location information is collected and analyzed to obtain the abnormal ventilation plan; The filtering and processing module is used to collect abnormal ventilation data according to the abnormal ventilation plan, analyze the abnormal ventilation data based on the filtering effect model, and issue an early warning based on the analysis results.

Images