Method for detecting theoretical formaldehyde bearing rate of biomass plate in closed space
By establishing a correlation between formaldehyde concentration in a sealed container and using water to absorb formaldehyde, the formaldehyde release from biomass boards was calculated, solving the problem of detecting the theoretical formaldehyde carrying capacity in a sealed space, and achieving accurate assessment of indoor air quality and ensuring safe production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-04-07
AI Technical Summary
The lack of existing technology for testing the theoretical formaldehyde carrying capacity of biomass boards with qualified formaldehyde content or emission levels in enclosed spaces affects the accurate assessment of indoor air quality.
By evaporating formaldehyde in a sealed container to form air of different concentrations, and using water to absorb the formaldehyde, a correlation between formaldehyde concentrations was established. The formaldehyde concentration released by the boards was measured, the theoretical formaldehyde carrying capacity of the biomass boards in the sealed space was calculated, and the formaldehyde concentration was determined by the desiccator method and the acetylacetone spectrophotometric method.
This paper provides a method for accurately calculating the theoretical formaldehyde carrying capacity of biomass boards, ensuring that indoor air quality meets standards and providing a reference for safe production and rational utilization.
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Figure CN121805563A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of indoor environmental technology, specifically relating to a method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space. Background Technology
[0002] Biomass boards are boards made primarily from renewable biomass materials such as agricultural waste (e.g., straw, fruit shells), forestry residues (e.g., branches, sawdust, bark), energy plants (e.g., reeds, miscanthus), and recycled waste wood. The manufacturing process involves crushing, drying, mixing with adhesives, laying, and hot-pressing. Biomass boards are closely related to people's daily lives, being used to make flooring, cabinets, wooden doors and windows, and wooden furniture for interior decoration and renovation. However, the production of biomass boards commonly uses formaldehyde-containing adhesives such as urea-formaldehyde resin, phenol-formaldehyde resin, or melamine-modified resin. Free formaldehyde in these adhesives is slowly released during the use of biomass boards, negatively impacting human health. Existing research indicates that humans spend approximately 87% of their time indoors. With increasing emphasis on environmental protection, people are increasingly concerned about formaldehyde concentrations in their indoor living environments. To control formaldehyde release from biomass boards, countries worldwide and international standardization organizations have successively issued a series of methods and standards for determining formaldehyde content and release from biomass boards. The desiccator method is a widely used testing method due to its advantages such as simple testing equipment, convenient operation, low testing cost, and non-toxicity to test personnel.
[0003] Most of these standards concern the formaldehyde limits of the biomass board materials themselves. Standards for indoor air quality control, however, focus on the formaldehyde limits within the environment. Currently, there are no corresponding testing methods for determining the appropriate indoor air quality level for biomass board materials with acceptable formaldehyde content or emission.
[0004] In response, this invention proposes a method for detecting the theoretical formaldehyde carrying capacity of biomass boards in enclosed spaces. Summary of the Invention
[0005] The purpose of this invention is to provide a method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space. This method calculates the formaldehyde release from biomass boards using a desiccator, thereby deriving the theoretical formaldehyde carrying capacity of the boards in a confined space. To achieve the above objective, this invention provides a method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space, comprising the following steps: A method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space, comprising: Step 1: Formaldehyde evaporates in a sealed container to form air containing different concentrations of formaldehyde. Water is then used to absorb formaldehyde in the air containing different concentrations of formaldehyde. A correlation is established between the formaldehyde concentration in the air of the sealed space and the formaldehyde concentration in the water that absorbs the formaldehyde. Step 2: Measure the background formaldehyde concentration in the air; Step 3: Place the board in a sealed container and use water to absorb the formaldehyde released by the board. Measure the formaldehyde concentration in the water after stabilization. Based on the correspondence between the formaldehyde concentration in the air of the sealed space in Step 1 and the formaldehyde concentration in the water, calculate the stable formaldehyde concentration in the air released from the board into the sealed container. Based on the load-bearing capacity of the board and the stable formaldehyde concentration in the air released from the board into the sealed container, obtain the stable formaldehyde release amount of the biomass board under a unit load-bearing capacity. Step 4: Calculate the theoretical formaldehyde carrying capacity of biomass boards in a closed space based on the limit formaldehyde concentration in the air, the background formaldehyde concentration in the air, and the stable value of formaldehyde release from biomass boards under the unit carrying capacity.
[0006] Optionally, in step four, the theoretical formaldehyde carrying capacity of biomass boards in a confined space is calculated using the following formula:
[0007] in, C 空气极限 To achieve the maximum formaldehyde concentration in a confined space, the air limit concentration can be set as needed. C 空气本底 This represents the background concentration of formaldehyde in the air of a confined space. L The theoretical formaldehyde carrying capacity of biomass boards in a confined space. C s The stable formaldehyde release value of biomass boards under unit load rate (i.e., load rate of 1 m³) is the value of formaldehyde release from the boards. 2 / m 3 (Stability value of formaldehyde emission from wood panels).
[0008] Optionally, the sealed container is a desiccator.
[0009] Optionally, the volume of the sealed container is 5-20L, and the volume of water used to absorb formaldehyde in the sealed container is 5-20ml.
[0010] Optionally, in step one, the formaldehyde concentration in the water that absorbs formaldehyde is determined using the acetylacetone spectrophotometric method.
[0011] Optionally, in step one, the standard curve method is used to establish the correspondence between the formaldehyde concentration in the air of the enclosed space and the formaldehyde concentration in the water that absorbs the formaldehyde.
[0012] Optionally, in step two, formaldehyde is absorbed from the air using water; then, the background formaldehyde concentration in the air is calculated based on the correspondence between the formaldehyde concentration in the air of the sealed space and the formaldehyde concentration in the water that absorbs the formaldehyde established in step one.
[0013] Optionally, in step three, the water absorbs the formaldehyde released from the board for more than 168 hours.
[0014] Optionally, the load-bearing capacity of the plate is 1~2m. 2 / m 3 .
[0015] Optionally, the limiting formaldehyde concentration in the air is set to 0.1~0.5 mg / m³. 3 .
[0016] The present invention has the following beneficial effects: This invention addresses the problem of detecting the theoretical formaldehyde carrying capacity of biomass boards in enclosed spaces, proposing a detection method comprising: Step 1: Establishing the correspondence between the formaldehyde concentration in the air of the enclosed space and the formaldehyde concentration in the water that absorbs formaldehyde; Step 2: Measuring the background formaldehyde concentration in the air; Step 3: Obtaining the stable value of formaldehyde release from the biomass board at a unit carrying capacity based on the carrying capacity of the board and the stable value of the formaldehyde concentration released from the board into the air of the enclosed container; Step 4: Calculating the theoretical formaldehyde carrying capacity of the biomass board in the enclosed space based on the limiting formaldehyde concentration in the air, the background formaldehyde concentration in the air, and the stable value of formaldehyde release from the biomass board at a unit carrying capacity. This invention determines the carrying capacity of biomass boards that meet indoor air quality standards by studying the relationship between the carrying capacity of biomass board materials and formaldehyde content in indoor environments. This invention uses a desiccator to study the change in formaldehyde release from boards with different formaldehyde release rates over time in enclosed spaces to obtain the stable formaldehyde release amount. Finally, through the mass balance relationship of the formaldehyde release process of the board, a calculation formula for the theoretical carrying capacity of the board under enclosed conditions is calculated. Through experimental verification, the method of the present invention can accurately calculate the theoretical formaldehyde carrying capacity of biomass boards. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a flowchart illustrating the steps of a method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space, as described in this invention. Detailed Implementation
[0019] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.
[0021] In this invention, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.
[0022] In the description of this invention, it should be understood that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0023] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0024] The formaldehyde load capacity of a board refers to the permissible area of board material used per unit space, ensuring that the formaldehyde concentration does not exceed the standard. The formaldehyde load capacity for different environmental protection grades of boards is as follows: E1 grade: ≤0.8 m² 2 / m 3 E0 grade: ≤2.0 m 2 / m 3 ENF level: ≤4.0 m 2 / m 3In actual renovations, it is recommended to use 50% of the maximum allowable level to leave a safety margin for other sources of pollution (such as furniture and paint). However, there is currently no corresponding testing method for determining the appropriate indoor air quality level for biomass board materials with acceptable formaldehyde content or emission levels.
[0025] This application provides a method for detecting the theoretical formaldehyde carrying capacity of biomass boards in enclosed spaces. This addresses the current situation where existing technologies focus on the formaldehyde limits of biomass board materials themselves and the formaldehyde limits in the environment, while there is no corresponding detection method for determining the required formaldehyde content or release level of biomass board materials to ensure acceptable air quality in a given space. This further affects users' accurate assessment of indoor environmental quality, provides more reference for the safe production and rational utilization of biomass boards, and offers users a more practical health and safety guarantee.
[0026] Specifically, the present invention proposes a method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space, comprising: Step 1: Formaldehyde evaporates in a sealed container to form air containing different concentrations of formaldehyde. Water is then used to absorb formaldehyde in the air containing different concentrations of formaldehyde. A correlation is established between the formaldehyde concentration in the air of the sealed space and the formaldehyde concentration in the water that absorbs the formaldehyde. Step 2: Measure the background formaldehyde concentration in the air; Step 3: Place the board in a sealed container and use water to absorb the formaldehyde released by the board. Measure the formaldehyde concentration in the water after stabilization. Based on the correspondence between the formaldehyde concentration in the air of the sealed space in Step 1 and the formaldehyde concentration in the water, calculate the stable formaldehyde concentration in the air released from the board into the sealed container. Based on the load-bearing capacity of the board and the stable formaldehyde concentration in the air released from the board into the sealed container, obtain the stable formaldehyde release amount of the biomass board under a unit load-bearing capacity. Step 4: Calculate the theoretical formaldehyde carrying capacity of biomass boards in a closed space based on the limit formaldehyde concentration in the air, the background formaldehyde concentration in the air, and the stable value of formaldehyde release from biomass boards under the unit carrying capacity.
[0027] Furthermore, in step four, the theoretical formaldehyde carrying capacity of biomass boards in the enclosed space is calculated using the following formula:
[0028] in, C 空气极限 To achieve the maximum formaldehyde concentration in a confined space, the air limit concentration can be set as needed. C 空气本底 This represents the background concentration of formaldehyde in the air of a confined space. LThe theoretical formaldehyde carrying capacity of biomass boards in a confined space. C s The stable formaldehyde release value of biomass boards under unit load rate (i.e., load rate of 1 m³) is the value of formaldehyde release from the boards. 2 / m 3 (Stability value of formaldehyde emission from wood panels).
[0029] Furthermore, the sealed container is a desiccator.
[0030] Furthermore, in step one, the formaldehyde concentration in the water that absorbs formaldehyde is determined using the acetylacetone spectrophotometric method.
[0031] Furthermore, in step one, the standard curve method is used to establish the correspondence between the formaldehyde concentration in the air of the enclosed space and the formaldehyde concentration in the water that absorbs the formaldehyde.
[0032] Furthermore, in step two, water is used to absorb formaldehyde from the air; then, the background formaldehyde concentration in the air is calculated based on the correspondence between the formaldehyde concentration in the air of the sealed space and the formaldehyde concentration in the water that absorbs formaldehyde established in step one.
[0033] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. It should be understood that this application is not limited to the exemplary embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. It should also be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all of them.
[0034] Example 1 Step 1) A formaldehyde solution of known concentration is allowed to fully evaporate naturally into a completely sealed desiccator. A certain volume of distilled water is placed at the bottom of the desiccator to absorb the formaldehyde, and then the concentration of formaldehyde absorbed by the distilled water in the desiccator is measured. Establish the correspondence between the formaldehyde concentration in the air of the sealed space (desiccator) and the formaldehyde concentration absorbed by the distilled water in the desiccator.
[0035] Specifically, crystallizing dishes were placed at the bottom of a 10.2L desiccator, and 20mL of distilled water was added to each dish. A formaldehyde solution of a certain concentration was prepared and diluted to various concentrations. Different concentrations of formaldehyde solution were then taken using a microsyringe and placed into the desiccator. The desiccator lid was quickly closed and sealed with Vaseline to prevent gas leakage. The desiccator was placed on a vibration-free flat surface to allow the formaldehyde solution to completely and naturally dissipate into the air inside the desiccator. The formaldehyde concentration in the air inside the desiccator was then known, and the concentrations are shown in Table 1. The formaldehyde concentrations in the air were 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, and 0.14 mg / m³, respectively. 3 Continue to leave it for a certain period of time to allow the distilled water in the crystallizing dish to fully absorb the formaldehyde in the air inside the desiccator.
[0036] In the specific testing process, 10 desiccators were set up for each concentration and the experiment was carried out simultaneously. One desiccator was turned on every 24 hours to test the formaldehyde concentration in the absorption liquid until the formaldehyde concentration stabilized.
[0037] Prepare a certain amount of absorbent solution by adding a certain amount of acetylacetone solution and ammonium acetate solution, and place it in a constant temperature water bath for heating (determined according to the method specified in GB17657-2022), and store it in the dark for 1 hour. Measure the absorbance of the absorbent solution using a spectrophotometer, and calculate the formaldehyde concentration in the distilled water absorbent solution based on the formaldehyde standard curve. Continue measuring the formaldehyde concentration in the water until the formaldehyde concentration stabilizes.
[0038] Based on the formaldehyde concentration data in the air inside a sealed dryer and the corresponding formaldehyde concentration in the distilled water absorbent, a correlation was established between the formaldehyde concentration in the air and the formaldehyde concentration in the distilled water absorbent. The formaldehyde concentration in the air inside the dryer and the formaldehyde concentration absorbed by the distilled water showed a linear correlation, with the formula y = 0.4858x + 0.0003 and a correlation coefficient R0. 2 =0.9986.
[0039] Table 1. Correspondence between formaldehyde concentration in enclosed air and formaldehyde concentration in distilled water
[0040] Step 2) Determine the background formaldehyde concentration in the desiccator according to the method in Step 1). The determined background concentration is 0.003 mg / m³. 3 .
[0041] Step 3) Place the board with a known surface area into the desiccator. The formaldehyde released by the board is absorbed by a certain volume of water. Measure the formaldehyde content in the water. Based on the correspondence between the formaldehyde concentration in the air of the closed space (desiccator) and the formaldehyde concentration absorbed by the distilled water in the desiccator in Step 1), calculate the formaldehyde concentration value released from the board into the air.
[0042] Specifically, a crystallizing dish is placed at the bottom of a desiccator, and a certain amount of distilled water is poured into it. The plate is inserted into the sample holder, and a specimen measuring 150 mm × 50 mm × 18 mm is placed in the desiccator. All four sides are sealed with aluminum foil, and the total measured surface area is 150 cm². 2 The sample holder was placed above the crystallizing dish, and the desiccator was placed on a vibration-free flat surface under the same environmental conditions as in step 1), allowing distilled water to absorb the formaldehyde released from the board. The formaldehyde concentration in the water was measured until it stabilized. Specifically, 10 desiccators were set up for each type of board, with a board sample placed in each desiccator. Experiments were conducted simultaneously, with one desiccator opened every 24 hours to test the formaldehyde concentration in the absorption liquid until it stabilized. Then, based on the linear correlation formula between the formaldehyde concentration in the air of the sealed space (desiccator) and the formaldehyde concentration absorbed by the distilled water in the desiccator, the formaldehyde concentration released into the air from the board was calculated. The formaldehyde concentration released into the air for the three types of boards was tested using the above method, as shown in Table 2.
[0043] Table 2 Example - Stable Formaldehyde Release Process Values of Board Materials
[0044] The formaldehyde concentration of board material 1 in a closed-space desiccator was consistently 7.03 mg / m³. 3 At this point, the load-bearing capacity of the board is 1.47m. 2 / m 3 The formaldehyde concentration of board material 2 in the closed-space desiccator was consistently 16.76 mg / m³. 3 At this point, the load-bearing capacity of the board is 1.47m. 2 / m 3 The formaldehyde concentration of board material 3 in the closed-space desiccator was consistently 20.41 mg / m³. 3 At this point, the load-bearing capacity of the board is 1.47m. 2 / m 3 .
[0045] The load-bearing capacity is 1.47 m. 2 / m 3 The stable formaldehyde release rate in a closed space was calculated to obtain the unit load-bearing capacity (1.0m²). 2 / m 3 The calculated value of stable formaldehyde release from the board material in the enclosed space (i.e., the above stable formaldehyde concentration value divided by the load-bearing capacity of 1.47 m³) is given. 2 / m 3 (as shown in Table 3).
[0046] Table 3. Stable formaldehyde release values of wood-based panels
[0047] Step 4) Based on the formaldehyde mass balance in the sealed space, the following equation can be derived: the mass of formaldehyde in the sealed space air at the limit minus the background formaldehyde mass in the sealed space air equals the mass of formaldehyde when the board material stably releases formaldehyde at the maximum load. That is:
[0048] Therefore, the formula for calculating the load-bearing limit of the board in a confined space is:
[0049] In the formula, V For the volume of a closed space, C 空气极限 To achieve the maximum formaldehyde concentration in a confined space, the air limit concentration can be set as needed. C 空气本底 This represents the background concentration of formaldehyde in the air of a confined space. L The theoretical formaldehyde carrying capacity of biomass boards in a confined space. C s For a load capacity of 1 m 2 / m 3 Stable formaldehyde emission values of biomass boards.
[0050] Step 5) Based on the calculation formula for the load-bearing limit of the board in a confined space, the theoretical load-bearing rate of the board in the confined space can be calculated. In this embodiment, the theoretical load-bearing capacity was calculated under two different conditions. In condition 1, the formaldehyde concentration in the air of the sealed space reached its limit at 0.10 mg / m³. 3 In State 2, the formaldehyde concentration in the enclosed space reaches its limit at 0.50 mg / m³. 3 The calculation results are shown in Table 4.
[0051] Table 4 Theoretical Formaldehyde Loading Rate of Boards
[0052] Experimental verification: Based on the load-bearing ratio calculated in step 5), prepare boards of the corresponding size, place them in a completely sealed desiccator, and measure the formaldehyde concentration released from the boards into the air of the sealed space at that load-bearing ratio.
[0053] First, the load-bearing capacity of board 1 calculated under state 1 was selected. Following the specifications in Table 4, a board with dimensions of 11 mm × 10 mm × 18 mm (edge sealed) was prepared, yielding a load-bearing capacity of 0.021 m. 2 / m 3The test specimens were placed in the aforementioned 10.2L desiccator for testing, and the testing procedure was the same as step 3) above. The results are shown in Table 5.
[0054] Table 5 Verification of the Theoretical Formaldehyde Loading Rate of Boards in State 1
[0055] Example 1: A board sample was prepared according to the theoretical load-bearing capacity and placed in a sealed space. The stable formaldehyde concentration was close to the set value of 0.10 mg / m³. 3 The limit value.
[0056] Then, based on the load-bearing rates calculated for plates 1, 2, and 3 in state 2 in Table 4, specimens with the following specifications were prepared: Plate 1: 36 mm × 15 mm × 18 mm (edge sealed), Plate 2: 15 mm × 15 mm × 18 mm (edge sealed), and Plate 3: 13 mm × 14 mm × 18 mm (edge sealed). These specimens were placed in the aforementioned 10.2L desiccator for testing, and the testing procedure was the same as in step 3) above. The results are shown in Table 6.
[0057] Table 6. Verification of the Theoretical Formaldehyde Loading Rate of Boards in State 2
[0058] Three types of boards were prepared into samples according to their theoretical load-bearing capacity. When placed in a sealed space, the stable formaldehyde concentration was close to the set value of 0.50 mg / m³. 3 The limit value.
[0059] Based on the above experimental verification, it can be seen that the method of the present invention can accurately calculate the theoretical formaldehyde carrying capacity of biomass boards.
[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space, characterized in that, include: Step 1: Formaldehyde evaporates in a sealed container to form air containing different concentrations of formaldehyde. Water is then used to absorb the formaldehyde in the air containing different concentrations of formaldehyde. A correlation is established between the formaldehyde concentration in the air of the sealed space and the formaldehyde concentration in the water that absorbs the formaldehyde. Step 2: Measure the background formaldehyde concentration in the air; Step 3: Place the board in a sealed container and use water to absorb the formaldehyde released by the board. Measure the formaldehyde concentration in the water after stabilization. Based on the correspondence between the formaldehyde concentration in the air of the sealed space in Step 1 and the formaldehyde concentration in the water, calculate the stable formaldehyde concentration in the air released from the board into the sealed container. Based on the load-bearing capacity of the board and the stable formaldehyde concentration in the air released from the board into the sealed container, obtain the stable formaldehyde release amount of the biomass board under a unit load-bearing capacity. Step 4: Calculate the theoretical formaldehyde carrying capacity of biomass boards in a closed space based on the limit formaldehyde concentration in the air, the background formaldehyde concentration in the air, and the stable value of formaldehyde release from biomass boards under the unit carrying capacity.
2. The method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space according to claim 1, characterized in that, In step four, the theoretical formaldehyde carrying capacity of biomass boards in a confined space is calculated using the following formula: in, C 空气极限 To achieve the maximum formaldehyde concentration in a confined space, the air limit concentration can be set as needed. C 空气本底 This represents the background concentration of formaldehyde in the air of a confined space. L The theoretical formaldehyde carrying capacity of biomass boards in a confined space. C s This represents the stable formaldehyde release value of biomass boards under a unit load-bearing capacity.
3. The method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space according to claim 1, characterized in that, The sealed container is a desiccator.
4. The method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space according to claim 1, characterized in that, The sealed container has a volume of 5-20L, and the volume of water used to absorb formaldehyde in the sealed container is 5-20ml.
5. The method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space according to claim 1, characterized in that, In step one, the formaldehyde concentration in the water that absorbs formaldehyde is determined using the acetylacetone spectrophotometric method.
6. The method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space according to claim 1, characterized in that, In step one, the standard curve method is used to establish the correspondence between the formaldehyde concentration in the air of a closed space and the formaldehyde concentration in the water that absorbs formaldehyde.
7. The method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space according to claim 1, characterized in that, In step two, water is used to absorb formaldehyde from the air; then, the background formaldehyde concentration in the air is calculated based on the correspondence between the formaldehyde concentration in the air of the sealed space and the formaldehyde concentration in the water that absorbs formaldehyde established in step one.
8. The method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space according to claim 1, characterized in that, In step three, the water absorbs the formaldehyde released from the board for more than 168 hours.
9. The method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space according to claim 1, characterized in that, The load-bearing capacity of the plate is 1~2m. 2 / m 3 .
10. The method for detecting the theoretical formaldehyde carrying capacity of biomass boards in a confined space according to claim 1, characterized in that, The limit concentration of formaldehyde in the air is set at 0.1~0.5 mg / m³. 3 .