CN109884254B - Simulation laboratory for detecting harmful gas precipitation amount of plates and furniture and use method - Google Patents
Simulation laboratory for detecting harmful gas precipitation amount of plates and furniture and use method Download PDFInfo
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Abstract
A simulation laboratory for detecting the harmful gas precipitation amount of plates and furniture and a use method thereof are provided, so that the harmful gas precipitation amount data of tested objects in the same space in unit time can be conveniently obtained. The device comprises a laboratory main body, a test environment control system and a measuring device; the laboratory body is used for forming an airtight test environment capable of storing tested objects; the test environment control system comprises a ventilation module which mainly comprises an air inlet channel, an air outlet channel and a ventilation device; the purification device and the one-way valve are sequentially arranged in the air inlet channel, and the one-way valve is arranged in the air outlet channel, so that outdoor gas can only enter the laboratory main body in one way and does not contain harmful gas; the measuring device is used for measuring indoor temperature data, indoor humidity data, indoor air pressure data, indoor harmful gas data and outdoor air pressure data. The method is convenient for determining proper furniture and plates before indoor decoration, and avoids the treatment cost when harmful gas exceeds the standard requirement after indoor decoration.
Description
Technical Field
The invention relates to the technical field of furniture and board detection for furniture, in particular to a simulation laboratory for detecting harmful gas precipitation amount of boards and furniture and a use method thereof.
Background
In the past ten years, the indoor environmental pollution problem in China is quite serious, and the problem of social hot spot is formed for several years continuously: a survey result published in 2001 by China Consumer society shows that the concentration of harmful gas exceeds 73% in indoor environmental pollution detection after decoration of 30 users in Beijing city, the concentration of harmful gas exceeds 79% in indoor environmental pollution detection after decoration of 53 users in Hangzhou city, the highest concentration of harmful gas exceeds more than 10 times, and in addition, VOC and benzene exceeds 40%.
After the control of indoor environmental pollution of civil construction works is released and executed in the early 2002 year, various related departments do a lot of work, the overall situation is gradually improved, but the problems still exist: according to 2006-the detection result of indoor environmental pollution of decorated houses and office buildings in 2009 partial areas, the harmful gas exceeding proportion is more than 50%, and the TVOC exceeds 40%. The CCTV-2 living channel of the central television station was once organized in 2005 for coarse inspection of the pollution part project of the indoor decoration, and the result shows that harmful gas is serious in exceeding standard (the exceeding standard proportion is 70%), TVOC is 38%, benzene pollution is light (the exceeding standard proportion is 11%), and the coarse inspection conclusion is that: the indoor pollution caused by decoration in China is serious, and the related departments of China should be concerned (the rough examination is lack of technical support and quality control, and data only serve as reference). Complaints of indoor environmental pollution problems in local newspapers and television news reports are continuous, indoor environmental pollution disputes occur, cases of children suffering from leukemia are increased, and spearhead points still are indoor decoration pollution.
Over ten years, the problems of how to pollute the indoor environment in China, how to solve the main problems at present, how to master the using amount of decoration materials in decoration design to ensure that the indoor air pollution is not out of standard, how to ensure that the indoor decoration materials are polluted within the national specified limit values in different seasons (different temperatures) and the like are solved, and the construction, environmental protection and sanitation systems do not organize nationwide indoor pollution investigation, the basic conditions are unclear, the research on pollutant release conditions under different decoration working conditions is less, the definite answer is difficult to be given, and first-line decoration design constructors lack technical support for pollution control and cannot face the indoor pollution problem.
In view of the current situation, a simulation experiment room for detecting harmful gas precipitation under the conditions of different usage amounts, different humiture and different ventilation amounts of the decorative materials is urgently needed, so that technical support is provided for first-line decorative design constructors to reduce and prevent pollution from the actual needs of decorative design construction, and targeted measures for indoor decorative pollution prevention are provided.
Disclosure of Invention
The invention aims to provide a simulation laboratory for detecting the harmful gas precipitation amount of boards and furniture, so as to obtain the harmful gas precipitation amount data of tested objects in the same space in unit time.
In order to solve the technical problems, the invention adopts the following technical scheme:
Designing a simulation laboratory for detecting the harmful gas precipitation amount of plates and furniture, wherein the simulation laboratory comprises a laboratory main body, a test environment control system and a measuring device; the laboratory main body is provided with an airtight door and is used for forming an airtight test environment capable of storing tested objects; the test environment control system comprises a ventilation module; the ventilation module comprises an air inlet channel, a purifying device, an exhaust channel and a ventilation device, wherein the purifying device and the first one-way valve are sequentially arranged in the air inlet channel, and the second one-way valve is arranged in the exhaust channel, so that the gas outside the laboratory main body can only enter the laboratory main body in one direction, and the gas entering the laboratory main body does not contain harmful gas; the ventilation device is arranged in the air inlet channel or the exhaust channel; the measuring device is used for measuring indoor temperature data, indoor humidity data, indoor air pressure data and indoor harmful gas data in the airtight test environment and outdoor air pressure data outside the airtight test environment.
Preferably, the measuring device further comprises a plurality of sampling pipes which are fixedly arranged on the roof of the laboratory main body, and a valve is arranged outside the laboratory main body and on the sampling pipes; the laboratory main body comprises a first wall and a second wall opposite to the first wall, a plurality of air outlets are formed in the rear of the first one-way valve, the air outlets are uniformly distributed and close to the first wall, a plurality of air inlets are formed in the front of the second one-way valve, and the air inlets are uniformly distributed and close to the second wall.
Further, 3 air inlet branch pipes are vertically arranged at positions close to the first wall, the air outlets are arranged at positions, adjacent to the second wall, of the air inlet branch pipes, and one air outlet is formed in each air inlet branch pipe in the height direction of each air inlet branch pipe every 0.18-0.22 m; the middle part of each air inlet branch pipe is communicated with the air outlet side of the first one-way valve, and plugs are arranged at two ends of each air inlet branch pipe; 3 exhaust branch pipes are vertically arranged at positions close to the second wall, the air inlets are arranged at positions of the exhaust branch pipes adjacent to the first wall, and one air inlet is formed in each exhaust branch pipe in the height direction of each exhaust branch pipe every 0.18-0.22 m; the middle part of the exhaust branch pipe is communicated with the air inlet side of the second one-way valve, and plugs are arranged at two ends of each exhaust branch pipe.
Further, the distance between the first face wall and the second face wall is 2-3 m, 5 sampling tubes are arranged, and sampling ports of the sampling tubes are distributed at the vertexes and the intersection points of the cross shape.
Preferably, an airtight body is attached to the joint between the laboratory main body and the airtight door, and the airtight body comprises a non-radioactive material and a tin foil for wrapping the non-radioactive material, and the non-radioactive material is arranged in the tin foil.
Preferably, the measuring device further comprises a temperature and humidity sensor arranged in the laboratory main body, the test environment control system further comprises a temperature regulator, a humidity regulator and a controller, the temperature and humidity sensor is correspondingly connected with the input end of the controller, the output end of the controller is respectively and electrically connected with the temperature regulator and the temperature regulator, so that the temperature in the airtight test environment is maintained in a target temperature interval, and the humidity in the airtight test environment is maintained in a target humidity interval.
Preferably, the ventilation device comprises an induced draft fan arranged in the air inlet channel and an exhaust fan arranged in the exhaust channel, and the induced draft fan is a stepless variable frequency fan with the speed of 3m 3/h-30m3/h.
A method of using the aforementioned simulation laboratory for detecting harmful gas evolution of panels and furniture, the laboratory body volume to target space volume ratio being 1: a, the material types of the tested objects are consistent with those of the objects placed in the target measuring space, and the volume ratio of the number of the tested objects to the number of the objects placed in the target measuring space is 1: a, a; a is a constant greater than 0, and the value of a is preferably 1, comprising the steps of,
(1) An evacuation step comprising measuring a concentration of a harmful gas in the laboratory body at a frequency of 0.5 times/hour with the airtight door in a closed state, and operating a ventilation device in time after the measurement is completed to replace the gas in the laboratory body; in a measurement period of at least 24 hours continuously, carrying out a next step after the concentration of harmful gas in the laboratory main body, the indoor temperature data and the indoor temperature data reach the test requirements;
(2) And a step of placing the tested object, wherein the step of placing the tested object comprises the steps of placing the tested object into the laboratory main body after the simulation laboratory meets the test requirement, forming an airtight test environment in the laboratory main body, and performing at least one test mode after 48 hours:
Test mode a. Recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 1 time/hour, simultaneously measuring harmful gas concentrations of at least 4 sampling points in the laboratory main body, wherein the average value of the harmful gas concentrations of the sampling points is the harmful gas concentration correction value of the time, and operating a ventilation device in time after the measurement is completed so as to replace the gas in the laboratory main body; during a measurement period of at least 24 hours in succession, the harmful gas concentration correction value measured each time is substantially stable;
Test mode b. Recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 0.5 times/hour, simultaneously measuring harmful gas concentrations of at least 4 sampling points in the laboratory main body, wherein the average value of the harmful gas concentrations of the sampling points is the harmful gas concentration correction value of the sampling points, and operating a ventilation device in time after the measurement is completed so as to replace the gas in the laboratory main body; during a measurement period of at least 24 hours in succession, the harmful gas concentration correction value measured each time is substantially stable;
Test mode c. Recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 0.2 times/hour, simultaneously measuring harmful gas concentrations of at least 4 sampling points in the laboratory main body, wherein the average value of the harmful gas concentrations of the sampling points is the harmful gas concentration correction value of the sampling points, and operating a ventilation device in time after the measurement is completed so as to replace the gas in the laboratory main body; during a measurement period of at least 24 hours in succession, the harmful gas concentration correction value measured each time is substantially stable;
recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 0.1 times/hour, measuring harmful gas concentrations of at least 4 sampling points in the laboratory main body, wherein the average value of the harmful gas concentrations of the sampling points is the harmful gas concentration correction value of the sampling points, and operating a ventilation device in time after the measurement is completed so as to replace the gas in the laboratory main body; during a measurement period of at least 24 hours in succession, the harmful gas concentration correction value measured each time is substantially stable;
Test mode e. Recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 0.1 times/hour while measuring harmful gas concentrations at least 4 sampling points in the laboratory body, the harmful gas concentration average value of the sampling points being the harmful gas concentration correction value of the time, the harmful gas concentration correction value measured each time being substantially stable in a measurement period of at least 48 hours in succession;
When two or more of the above test methods are simultaneously adopted, the test method a, the test method b, the test method c, the test method d, and the test method e should be sequentially performed, and the ventilation device is operated after each test method is finished to replace the gas in the laboratory main body, and the next test method can be started after the gas in the laboratory main body is updated for at least 48 hours.
Preferably, in the evacuating step, the harmful gas in the laboratory main body comprises formaldehyde, ammonia and VOCS, when the formaldehyde concentration is less than or equal to 0.01mg/m 3, the ammonia concentration is less than or equal to 0.05mg/m 3, the VOCS concentration is less than or equal to 0.1mg/m 3, and the indoor temperature data is 15-35 ℃ and the indoor humidity data is 30-80%, the test requirement is met.
Compared with the prior art, the invention has the beneficial effects that: the method can acquire the harmful gas precipitation amount data of the tested object in the same space in unit time, so that proper furniture and plates can be conveniently determined before indoor decoration, and the treatment cost when the harmful gas exceeds the standard requirement after the indoor decoration is avoided.
Drawings
FIG. 1 is a schematic view of a simulated laboratory for detecting the amount of harmful gases evolved from panels and furniture with the roof removed.
In the figure, the laboratory body comprises a 1-laboratory body, an 11-airtight door, a 12-first wall, a 13-second wall, a 21-air inlet channel, a 211-air outlet, a 22-purifying device, a 23-induced draft fan, a 24-first one-way valve, a 25-valve, a 31-air outlet channel, a 311-air inlet, a 32-second one-way valve, a 33-exhaust fan, a 34-valve, a 4-control box, a 51-temperature and humidity sensor, a 52-sampling tube, a 521-valve and a 522-sampling port.
Detailed Description
The following examples are given to illustrate the invention in detail, but are not intended to limit the scope of the invention in any way.
In the prior art, an in-production PPM test instrument can measure formaldehyde concentration; the pumping type ammonia gas analyzer produced by Wan Andi measurement and control Limited company in Shenzhen city can measure the ammonia gas concentration; the VOC on-line analyzer manufactured by the western ampbo purity instruments limited can be used to detect VOCs concentrations.
Example 1: a simulation laboratory for detecting the amount of harmful gases released from boards and furniture, see fig. 1, comprises a laboratory body 1, a test environment control system and a measuring device. In fig. 1, a laboratory main body 1 is provided in a room, and a sample storage processing room and a chemical analysis laboratory can be provided in the room as required.
However, the laboratory body 1 may not be provided in the house.
The laboratory body 1 is provided with an airtight door for forming an airtight test environment capable of storing the test object.
The test environment control system comprises a ventilation module; the ventilation module comprises an air inlet channel 21, a purifying device 22, an exhaust channel 31 and a ventilation device, wherein the purifying device 22 and the first one-way valve 24 are sequentially arranged in the air inlet channel 21, and the second one-way valve 32 is arranged in the exhaust channel 31, so that the air outside the laboratory main body 1 can only enter the laboratory main body 1 in one way, and the air entering the laboratory main body 1 does not contain harmful air; the ventilation means is provided in the intake passage 21 or the exhaust passage 31.
The measuring device is used for measuring indoor temperature data, indoor humidity data, indoor air pressure data and indoor harmful gas data in the airtight test environment and outdoor air pressure data outside the airtight test environment. The indoor temperature data is typically relative temperature RH data.
In general, formaldehyde, ammonia, VOCS can be referred to as laboratory bulk hazardous gases. methods for removing formaldehyde are formaldehyde purification adsorbents such as activated carbon, activated silicon, activated alumina; or a photocatalytic material, such as cycloaldolase produced in germany. The method for removing ammonia gas by is an adsorption method and an acid reaction method, and an adsorption material is generally required to be arranged after the acid reaction method so as to adsorb the evaporated acid gas. The method for removing VOCS includes adsorption method and combustion method. An adsorbent layer, such as activated carbon, activated silicon, may typically be provided within the purification device. The purification device may also include a dust removal module, such as a cloth bag filter, as desired.
Example 2: a simulation test room for detecting the amount of harmful gas out of a plate and furniture, referring to fig. 1, the laboratory body includes a first wall 12 and a second wall 13 opposite to the first wall 12, and as a preference for embodiment 1, the measuring device includes air pressure sensors (not shown), temperature and humidity sensors 51, at least two air pressure sensors, one of which is provided in the laboratory body 1, the other air pressure sensor is provided outside the laboratory body 1, and the test environment control system further includes a controller (not shown) provided in the control box 4. The controller can be an electronic computer, a PLC and a singlechip, taking the controller as an example of the electronic computer, and an RS232 data acquisition card and an RS232 control card are attached to the electronic computer. The RS232 data acquisition card comprises a serial port-to-RS 232 circuit, an A/D conversion module and a multi-path sampling circuit, wherein the interfaces of the three sampling circuits of the RS232 data acquisition card are respectively and correspondingly and electrically connected with the wires of the temperature and humidity sensor 51 and the wires of the air pressure sensor, and the RS232 serial port of the RS232 data acquisition card is spliced on the RS232 serial port of the electronic computer.
As a method for measuring the harmful gas, a plurality of sampling tubes 52 may be fixedly disposed on the top of the laboratory body 1, and a valve 521 may be mounted on the sampling tube 52 outside the laboratory body 1, and at this time, the opening at one end of the sampling tube 52 in the laboratory body 1 corresponds to the sampling opening 522, and when the valve 521 is closed, the gas in the laboratory body 1 cannot be exchanged with the gas outside the laboratory body 1. Referring to fig. 1, preferably, the distance between the first wall 12 and the second wall 13 is 2-3 m, 5 sampling tubes 52 are provided, and sampling openings 522 of the sampling tubes 52 are distributed at the vertex and intersection of the cross. The sampling port 522 of the sampling tube 52 may be made of a stainless steel tube having a diameter of 6mm, and is drawn out of the laboratory body 1 by using a pressure-measuring tube.
The air inlet passage 21 is formed with a plurality of air outlets 211 behind the first check valve 24, the air outlets 211 are uniformly distributed and disposed near the first face wall 12, and the air outlet passage 31 is formed with a plurality of air inlets 311 in front of the second check valve 32, the air inlets 311 are uniformly distributed and disposed near the second face wall 13. Thus, during ventilation, the gas outside the laboratory main body 1 is filtered by the purifying device 22 to remove harmful gas, and then enters the laboratory main body 1 through the first one-way valve 23 and the gas outlet 211, and the gas in the laboratory main body 1 enters the exhaust pipeline 31 through the gas inlet 311, and in the exhaust pipeline 31, the gas is discharged outside the laboratory main body 1 through the second one-way valve 32. The air outlet 211 and the air inlet 311 are arranged on opposite sides, so that air in the laboratory main body 1 is conveniently exhausted. Moreover, the sampling port 522 is provided at the roof of the laboratory body 1 to ensure the stability of the concentration of the harmful gas at the sampling port 522, because after the gas in the laboratory body 1 is exhausted and updated, the harmful gas such as formaldehyde, ammonia, and VOCS emitted from the tested object in the laboratory body 1 is diffused to the roof of the laboratory body 1 after filling the laboratory body 1.
Preferably, in the laboratory main body 1, the air inlet channel is communicated with the middle parts of three air inlet branch pipes which are uniformly and vertically arranged in a separated mode, and plugs are arranged at two ends of each air inlet branch pipe. Each air inlet branch pipe is 2.2-2.8 m long, and each air inlet branch pipe is provided with an air outlet 211 at a distance of 0.18-0.22 m, and the inner diameter of the air outlet can be 5-7 mm. For example, the air inlet channel is formed by adopting a phi 40mm pipe, the length of each air inlet branch pipe is 2.5m, each air inlet branch pipe is provided with an air outlet 211 at a distance of 0.2m, and the inner diameter of the air outlet is 6mm. In the laboratory main body 1, an exhaust channel is communicated with the middle parts of three exhaust branch pipes which are evenly and vertically separated, plugs are arranged at two ends of each exhaust branch pipe, the length of each exhaust branch pipe is 2.2-2.8 m, an air inlet 311 is formed in each exhaust branch pipe at a distance of 0.18-0.22 m, and the inner diameter of the air inlet can be 7-9 mm. As an example, the exhaust passage is formed by using a pipe with the diameter of 50mm, the length of each exhaust branch pipe is 2.5m, each exhaust branch pipe is provided with an air inlet 311 at a distance of 0.2m, and the inner diameter of each air inlet is 8mm.
Preferably, when the airtight door 11 is closed on the laboratory main body 1, an airtight body (not shown) is attached to the connection between the laboratory main body 1 and the airtight door 11, the airtight body includes a non-radioactive material and a tin foil for wrapping the non-radioactive material, the non-radioactive material is disposed in the tin foil, and the reason for using the non-radioactive material is to avoid contaminating materials in a room and to interfere with the test results.
Preferably, the test environment control system further comprises a temperature regulator and a humidity regulator, wherein after acquiring indoor temperature data and indoor humidity data in the airtight test environment, the temperature regulator and the humidity regulator can be controlled manually or by an automatic control method. The temperature regulator is a common air conditioner, and is generally provided with a single-chip controller inside, which can regulate the temperature and reduce the humidity, and has the function of maintaining the temperature in the airtight test environment within a target temperature range. Therefore, when the temperature regulator is an air conditioner, the humidity regulator only needs to have the function of increasing the humidity, for example, a humidifier. Because the humidity regulator is realized by the air regulator and the humidifier together, the serial port line of the RS232 control card is in master-slave communication connection with the serial port line of the singlechip type controller of the air regulator, and the relay load port interface of the RS232 control card is connected in series with the power supply line of the humidifier, so that the humidity in the airtight test environment is maintained in a target humidity range by controlling the humidity reducing function of the air regulator and the humidifying function of the humidifier through an electronic computer.
Preferably, the air exchanging device comprises an induced draft fan 23 arranged in the air inlet channel 21 and an exhaust fan 33 arranged in the exhaust channel 31, wherein the induced draft fan 23 is a stepless variable frequency fan with the speed of 3m 3/h-30m3/h. The induced draft fan 23 is preferably disposed between the purifying device 22 and the first check valve 24 because, when the induced draft fan 23 is disposed at the air intake side of the purifying device 22, the air flow discharged from the induced draft fan 23 may exceed the purifying capability of the purifying device; when the induced draft fan 23 is disposed on the air outlet side of the first check valve 24, the first check valve 24 forms air flow resistance. Similarly, the exhaust fan 33 is preferably disposed on the intake side of the second check valve 32.
In addition, the exhaust duct 31 may be provided with no exhaust fan 33, and the exhaust duct 31 may be provided with a differential pressure regulating valve, so that when the induced draft fan 23 is operated, the air pressure in the laboratory main body 1 is increased, and when the differential pressure opening condition of the differential pressure regulating valve is reached, the air in the laboratory main body 1 can be exhausted from the exhaust duct 31.
According to the requirement, the induced draft fan 23 can be arranged in a fan box, the air quantity of the fan box is measured by adopting a measuring method required by national standard (GB/T7725-2004 annex D), equipment such as a nozzle, a differential pressure tester, the induced draft fan and the like is arranged in the fan box, and a stainless steel shell is adopted outside the fan box.
Optionally, the valve 25 is installed on the air inlet channel of the air inlet side of the purifying device 22, and the valve 34 is installed on the air outlet channel of the air outlet side of the second one-way valve 32, so that when the valve 25, the valve 34, the valve 521 and the airtight door 11 are closed, the gas in the laboratory body 1 is isolated from the gas outside the laboratory body 1.
Example 3: a method of using the simulation laboratory for detecting the amount of harmful gas out of boards and furniture in example 1 or example 2, the laboratory main body 1 volume to target space volume ratio is 1: a, the material types of the tested objects are consistent with those of the objects placed in the target measuring space, and the volume ratio of the number of the tested objects to the number of the objects placed in the target measuring space is 1: a, a; a is a constant greater than 0, and the value of a is preferably 1, comprising the steps of,
(1) An evacuation step comprising measuring a concentration of a harmful gas in the laboratory body at a frequency of 0.5 times/hour with the airtight door in a closed state, and operating a ventilation device in time after the measurement is completed to replace the gas in the laboratory body; in a measurement period of at least 24 hours continuously, carrying out a next step after the concentration of harmful gas in the laboratory main body, the indoor temperature data and the indoor temperature data reach the test requirements; as an alternative example, the harmful gases in the laboratory body comprise formaldehyde, ammonia and VOCS, wherein when the formaldehyde concentration is less than or equal to 0.01mg/m 3, the ammonia concentration is less than or equal to 0.05mg/m 3, the VOCS concentration is less than or equal to 0.1mg/m 3, the indoor temperature data is 15-35 ℃ and the indoor humidity data is 30-80%, the test requirement is met; in the subsequent test process, the indoor temperature data is maintained between 15 ℃ and 35 ℃ and the indoor humidity data is maintained between 30% and 80%.
(2) And a step of placing the tested object, wherein the step of placing the tested object comprises the steps of placing the tested object into the laboratory main body after the simulation laboratory meets the test requirement, forming an airtight test environment in the laboratory main body, and performing at least one test mode after 48 hours:
Test mode a. Recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 1 time/hour, simultaneously measuring harmful gas concentrations of at least 4 sampling points in the laboratory main body, wherein the average value of the harmful gas concentrations of the sampling points is the harmful gas concentration correction value of the time, and operating a ventilation device in time after the measurement is completed so as to replace the gas in the laboratory main body; the same applies to the case where the harmful gas concentration correction value measured each time is substantially stable in the measurement period of at least 24 hours in succession, and the harmful gas concentration is considered to be substantially stable when the harmful gas concentration correction value is within the upper and lower 0.2mg/m 3 sections of the average value;
Test mode b. Recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 0.5 times/hour, simultaneously measuring harmful gas concentrations of at least 4 sampling points in the laboratory main body, wherein the average value of the harmful gas concentrations of the sampling points is the harmful gas concentration correction value of the sampling points, and operating a ventilation device in time after the measurement is completed so as to replace the gas in the laboratory main body; during a measurement period of at least 24 hours in succession, the harmful gas concentration correction value measured each time is substantially stable;
Test mode c. Recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 0.2 times/hour, simultaneously measuring harmful gas concentrations of at least 4 sampling points in the laboratory main body, wherein the average value of the harmful gas concentrations of the sampling points is the harmful gas concentration correction value of the sampling points, and operating a ventilation device in time after the measurement is completed so as to replace the gas in the laboratory main body; during a measurement period of at least 24 hours in succession, the harmful gas concentration correction value measured each time is substantially stable;
recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 0.1 times/hour, measuring harmful gas concentrations of at least 4 sampling points in the laboratory main body, wherein the average value of the harmful gas concentrations of the sampling points is the harmful gas concentration correction value of the sampling points, and operating a ventilation device in time after the measurement is completed so as to replace the gas in the laboratory main body; during a measurement period of at least 24 hours in succession, the harmful gas concentration correction value measured each time is substantially stable;
Test mode e. Recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 0.1 times/hour while measuring harmful gas concentrations at least 4 sampling points in the laboratory body, the harmful gas concentration average value of the sampling points being the harmful gas concentration correction value of the time, the harmful gas concentration correction value measured each time being substantially stable in a measurement period of at least 48 hours in succession;
When two or more of the above test methods are simultaneously adopted, the test method a, the test method b, the test method c, the test method d, and the test method e should be sequentially performed, and the ventilation device is operated after each test method is finished to replace the gas in the laboratory main body, and the next test method can be started after the gas in the laboratory main body is updated for at least 48 hours.
The recorded data and the measured harmful gas concentration data are processed. For example, the thresholds for the concentration of the harmful gas in test mode a, test mode b, test mode c, test mode d, test mode e can be obtained through tests, and then whether the release of the harmful gas from the furniture or the board meets the requirement or not can be determined by using the thresholds.
If necessary, in confirming the test effect of the present invention, the concentration of the harmful gas in the laboratory main body may be measured as a comparison while the concentration of the harmful gas in the laboratory main body is measured.
While the present invention has been described in detail with reference to the drawings and the embodiments, those skilled in the art will understand that various specific parameters in the above embodiments may be changed without departing from the spirit of the invention, and a plurality of specific embodiments are all common variation ranges of the present invention and will not be described in detail herein.
Claims (5)
1. A simulation laboratory for detecting harmful gas precipitation amount of plates and furniture comprises a laboratory main body, a test environment control system and a measuring device; the laboratory body is provided with an airtight door and is used for forming an airtight test environment capable of storing tested objects; the test environment control system comprises a ventilation module; the ventilation module comprises an air inlet channel, a purifying device, an exhaust channel and a ventilation device, wherein the purifying device and the first one-way valve are sequentially arranged in the air inlet channel, and the second one-way valve is arranged in the exhaust channel, so that the gas outside the laboratory main body can only enter the laboratory main body in one direction, and the gas entering the laboratory main body does not contain harmful gas; the ventilation device is arranged in the air inlet channel or the exhaust channel; the measuring device comprises an indoor air pressure sampling unit and an outdoor air pressure sampling unit; the measuring device is used for measuring indoor temperature data, indoor humidity data, indoor air pressure data and indoor harmful gas data in the airtight test environment and outdoor air pressure data outside the airtight test environment;
The measuring device also comprises a plurality of sampling pipes which are fixedly arranged on the roof of the laboratory main body, and a valve is arranged outside the laboratory main body and on the sampling pipes; the laboratory main body comprises a first wall and a second wall opposite to the first wall, a plurality of air outlets are formed in the air inlet channel and uniformly distributed and are close to the first wall, a plurality of air inlets are formed in the air outlet channel and are uniformly distributed and are close to the second wall in front of the second one-way valve; the measuring device further comprises a temperature and humidity sensor arranged in the laboratory main body, the test environment control system further comprises a temperature regulator, a humidity regulator and a controller, the temperature and humidity sensor is correspondingly connected with the input end of the controller, the output end of the controller is respectively and electrically connected with the temperature regulator and the temperature regulator, so that the temperature in the airtight test environment is maintained in a target temperature interval, and the humidity in the airtight test environment is maintained in a target humidity interval;
3 air inlet branch pipes are vertically arranged at positions close to the first wall, the air outlets are arranged at positions, adjacent to the second wall, of the air inlet branch pipes, and one air outlet is formed in each air inlet branch pipe in the height direction of each air inlet branch pipe every 0.18-0.22 m; the middle part of each air inlet branch pipe is communicated with the air outlet side of the first one-way valve, and plugs are arranged at two ends of each air inlet branch pipe; 3 exhaust branch pipes are vertically arranged at positions close to the second wall, the air inlets are arranged at positions of the exhaust branch pipes adjacent to the first wall, and one air inlet is formed in each exhaust branch pipe in the height direction of each exhaust branch pipe every 0.18-0.22 m; the middle part of each exhaust branch pipe is communicated with the air inlet side of the second one-way valve, and plugs are arranged at two ends of each exhaust branch pipe;
the distance between the first face wall and the second face wall is 2-3 m,5 sampling tubes are arranged, and sampling ports of the sampling tubes are distributed at the vertexes and the intersection points of the cross shape.
2. A simulation test chamber according to claim 1, wherein an airtight body is attached at the junction of the laboratory body and the airtight door, the airtight body comprising a non-radioactive material and a tin foil for wrapping the non-radioactive material, the non-radioactive material being disposed in the tin foil.
3. The simulation test chamber of claim 1, wherein the ventilation device comprises an induced draft fan arranged in the air inlet channel and an exhaust fan arranged in the exhaust channel, and the induced draft fan is a stepless variable frequency fan with the speed of 3m 3/h-30m3/h.
4. A method of using a simulation laboratory for detecting harmful gas evolution of boards and furniture according to any one of claims 1-3, said laboratory body volume to target space volume ratio being 1: a, the material types of the tested objects are consistent with those of the objects placed in the target measuring space, and the volume ratio of the number of the tested objects to the number of the objects placed in the target measuring space is 1: a, a; a is a constant greater than 0, characterized by comprising the steps of,
(1) An evacuation step comprising measuring a concentration of a harmful gas in the laboratory body at a frequency of 0.5 times/hour with the airtight door in a closed state, and operating a ventilation device in time after the measurement is completed to replace the gas in the laboratory body; in a measurement period of at least 24 hours continuously, carrying out a next step after the concentration of harmful gas in the laboratory main body, the indoor temperature data and the indoor temperature data reach the test requirements;
(2) And a step of placing the tested object, wherein the step of placing the tested object comprises the steps of placing the tested object into the laboratory main body after the laboratory main body meets the test requirement, forming an airtight test environment in the laboratory main body, and performing at least one test mode after 48 hours:
Test mode a. Recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 1 time/hour, simultaneously measuring harmful gas concentrations of at least 4 sampling points in the laboratory main body, wherein the average value of the harmful gas concentrations of the sampling points is the harmful gas concentration correction value of the time, and operating a ventilation device in time after the measurement is completed so as to replace the gas in the laboratory main body; during a measurement period of at least 24 hours in succession, the harmful gas concentration correction value measured each time is substantially stable;
Test mode b. Recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 0.5 times/hour, simultaneously measuring harmful gas concentrations of at least 4 sampling points in the laboratory main body, wherein the average value of the harmful gas concentrations of the sampling points is the harmful gas concentration correction value of the sampling points, and operating a ventilation device in time after the measurement is completed so as to replace the gas in the laboratory main body; during a measurement period of at least 24 hours in succession, the harmful gas concentration correction value measured each time is substantially stable;
Test mode c. Recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 0.2 times/hour, simultaneously measuring harmful gas concentrations of at least 4 sampling points in the laboratory main body, wherein the average value of the harmful gas concentrations of the sampling points is the harmful gas concentration correction value of the sampling points, and operating a ventilation device in time after the measurement is completed so as to replace the gas in the laboratory main body; during a measurement period of at least 24 hours in succession, the harmful gas concentration correction value measured each time is substantially stable;
recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 0.1 times/hour, measuring harmful gas concentrations of at least 4 sampling points in the laboratory main body, wherein the average value of the harmful gas concentrations of the sampling points is the harmful gas concentration correction value of the sampling points, and operating a ventilation device in time after the measurement is completed so as to replace the gas in the laboratory main body; during a measurement period of at least 24 hours in succession, the harmful gas concentration correction value measured each time is substantially stable;
Test mode e. Recording indoor temperature data, indoor humidity data, indoor air pressure data and outdoor air pressure data in the airtight test environment at a frequency of 0.1 times/hour while measuring harmful gas concentrations at least 4 sampling points in the laboratory body, the harmful gas concentration average value of the sampling points being the harmful gas concentration correction value of the time, the harmful gas concentration correction value measured each time being substantially stable in a measurement period of at least 48 hours in succession;
When a plurality of the test modes are adopted at the same time, the test mode a, the test mode b, the test mode c, the test mode d and the test mode e are sequentially carried out, and the ventilation device is operated after each test mode is finished so as to replace the gas in the laboratory main body, and the next test mode can be started after the gas in the laboratory main body is updated for at least 48 hours.
5. The method of using a simulation test chamber for detecting a harmful gas out-flow amount of a plate material and furniture according to claim 4, wherein in said evacuating step, the harmful gas in said laboratory body includes formaldehyde, ammonia, and VOCS, and said test requirement is satisfied when said formaldehyde concentration is not more than 0.01mg/m 3, said ammonia concentration is not more than 0.05mg/m 3, said VOCS concentration is not more than 0.1mg/m 3, and said indoor temperature data is 15 ℃ to 35 ℃ and indoor humidity data is 30% to 80%.
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| CN117871377B (en) * | 2023-12-15 | 2024-05-31 | 江苏诚益达计量检测有限公司 | Salt fog test box based on atomizer |
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