Method for testing aging life of deodorization module under low-concentration formaldehyde

Abstract

The invention discloses a method for testing the aging life of a deodorization module under low-concentration formaldehyde, and the method comprises the following steps: S1, preparing a test device; s2, building a test environment; s3, testing an initial formaldehyde removal rate; s4, low-concentration aging treatment: injecting a formaldehyde solution into a 6L aging bin through a sample injection needle to the surface of a heating sheet, controlling the formaldehyde concentration in the aging bin to be less than 1.0 ppm, starting the heating sheet, and after the formaldehyde is completely volatilized, closing the heating sheet, and starting a module odor removal function and a circulating fan; and S5, result recording: recording the formaldehyde removal rate and the formaldehyde treatment capacity of each material in the aging process, and calculating the service life of the module. According to the method, long-term evaluation of the performance and the service life of the catalyst material in the low-concentration formaldehyde environment is realized, accurate data recording and analysis are provided, and the service life of the module is predicted through scientific calculation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new refrigerator deodorization, and particularly relates to a method for testing aging life of a deodorization module under low-concentration formaldehyde. BACKGROUND

[0002] The new refrigerator odor refers to the odor emitted by various materials in the refrigerator when the refrigerator is parked in the warehouse. The odor-producing materials mainly include HIPS inner container, PP drawer, TPP tape, EPS foam, GPPS bottle frame and PE tape. Research shows that these materials can emit gas molecules containing alkanes, aldehydes, benzene and esters.

[0003] The new refrigerator odor is not friendly to consumers on the one hand, and is harmful to the image of the refrigerator factory on the other hand. The new refrigerator odor is harmful to the human body: benzene is a carcinogen, and aldehyde can cause leukemia. For consumers, when a high-end refrigerator has a strong plastic smell or other unpleasant odor at the moment of opening the door, the consumer will feel that the purchase of the refrigerator is unpleasant. Therefore, to avoid these problems, solving the new refrigerator odor is an urgent problem for the refrigerator factory.

[0004] There are three main methods for removing the new refrigerator odor on the market: 1. activated carbon adsorption, 2. potassium permanganate oxidation, and 3. raw material control.

[0005] Among them, the activated carbon adsorption utilizes the high-density microporous structure channel in the activated carbon to physically adsorb the odor molecules in the pore structure through capillary effect. For example, the patent No. 104707160A discloses a refrigerator deodorization device, which includes a refrigerator fan, the fan includes a fan cover and a fan body, characterized in that a recessed part is arranged on the inner wall surface of the fan cover, and an activated carbon layer is arranged in the recessed part. The fan cover is provided with a plurality of ventilation strips. This method can adsorb odor molecules, but there is a problem of overflow of saturated odor molecules, the service life is short, and in addition, the activated carbon has poor adsorption effect on aldehyde substances, and cannot completely achieve the adsorption and purification effect. Moreover, the activated carbon must be replaced or specially treated in time when it is saturated or inactivated after a period of use, otherwise it will cause secondary pollution to the refrigerator. In addition, such deodorization device needs to be used with the refrigerator after being powered on, which is called active deodorization in the industry. For example, the patent No. CN2447051Y discloses a refrigerator deodorization sheet, which claims to solve the drawbacks of activated carbon deodorization, but it still needs to be used with the refrigerator after being powered on, and has no use for new refrigerators.

[0006] The potassium permanganate method is to remove the easily reduced gas in the new refrigerator odor by using the strong oxidizing property of potassium permanganate, such as the patent No. CN106620794A discloses a refrigerator deodorant and a preparation method thereof, which is composed of the following weight parts of raw materials: component A 2 parts, component B 2-3 parts; the component A is composed of the following weight parts of raw materials: water 60-70 parts, potassium permanganate 3-8 parts, ethanol 5-10 parts, copper sulfate 1-3 parts, lactic acid 2-4 parts, ethylene glycol methyl ether 1-3 parts, zeolite molecular sieve 20-40 parts; the component B is composed of the following weight parts of raw materials: coconut shell charcoal 35-45 parts, diatomite 25-35 parts, polyvinyl acetate 8-13 parts, antibacterial agent 1-2 parts, water 10-25 parts, but this deodorant containing potassium permanganate has no effect on the gas with stable molecular structure, and the deodorizing effect is not satisfactory;

[0007] Although the method of solving the odor by controlling the raw materials can reduce the occurrence of the odor at the source, this method leads to a huge cost of raw materials, causes great profit pressure to the enterprise, and the control of raw materials cannot completely solve the odor problem but only reduces the generation of the odor, and the new refrigerator still has the odor;

[0008] The applicant proposes a passive deodorizing deodorizing module, which adopts the adsorption and decomposition method to adsorb and decompose the odor in the refrigerator, but since it is a passive deodorizing method, it cannot be directly used with the parts in the refrigerator to test the service life and aging life, and the formaldehyde concentration in the new refrigerator is low, so it is difficult to test the aging life of the product by the conventional method, and it is necessary to improve it. SUMMARY

[0009] The technical problem to be solved by the present application is to solve the problems of the prior art,

[0010] The application provides a kind of deodorizing module in low concentration formaldehyde aging life test method.

[0011] To achieve the above object, the present application provides the following technical scheme: a kind of deodorizing module in low concentration formaldehyde aging life test method, comprising the following steps,

[0012] S1. Prepare test device: take the sealed test box with volume V1 as 100L as test bin, solvent V2 is 6L sealed test box as aging bin, the material of sealed test box is acrylic and contains heating sheet, circulating fan, valve, purification device, sampling needle, test sample: honeycomb catalyst, use formaldehyde solution as test pollutant;

[0013] S2. Build test environment: control the temperature in laboratory to be 22-25 DEG C, and the relative humidity is 50-60%;

[0014] S3. Initial formaldehyde removal rate test: Place at least three test samples together in the test chamber, with the module and circulating fan placed parallel to each other. After placement, close the test chamber and inject formaldehyde solution into the surface of the heater in the test chamber through the injection needle. Turn on the heating element and wait for it to completely evaporate before turning it off. Turn on the circulating fan in the test chamber and monitor the formaldehyde concentration in the test chamber. After the formaldehyde concentration stabilizes, record the initial concentration C0. Turn on the purification device and run it for 1 hour, then record the final concentration C1. Calculate the formaldehyde removal rate η0.

[0015] S4. Low-concentration aging treatment: Inject formaldehyde solution into the 6L aging chamber through the injection needle onto the surface of the heating element. The formaldehyde concentration in the aging chamber is controlled to be less than 1.0 ppm. Turn on the heating element and wait for it to completely evaporate. Then turn off the heating element and turn on the module's deodorization function and the circulating fan.

[0016] S5. Results Recording: Record the formaldehyde removal rate and formaldehyde treatment amount of each material during the aging process, and calculate the module lifespan.

[0017] The above-mentioned method for testing the aging life of a deodorizing module under low formaldehyde concentration can be further set as follows: the size of the test sample in S1 is 65mm*20mm*20mm.

[0018] The above-mentioned method for testing the aging life of a deodorizing module under low formaldehyde concentration can be further set as follows: the formaldehyde concentration in the test chamber in S3 is controlled at 1.0±0.05ppm.

[0019] The above-mentioned method for testing the aging life of a deodorizing module under low formaldehyde concentration can be further set as follows: the formaldehyde concentration in S4 is 0.3-0.5 ppm.

[0020] The above-mentioned method for testing the aging life of a deodorizing module under low formaldehyde concentration can be further set as follows: each test sample in S4 undergoes a low-concentration aging treatment twice a day.

[0021] The above-mentioned method for testing the aging life of a deodorizing module under low formaldehyde concentration can be further set as follows: the low-concentration aging treatment time in S4 is 2 hours each time.

[0022] The above-mentioned method for testing the aging life of a deodorizing module under low formaldehyde concentration can be further set as follows: in S4, the single formaldehyde removal performance of each test sample is tested once every seven days.

[0023] Using the above technical solution, the removal rate calculation formula in S3 is as follows:

[0024] η0 = [(C0-C1) / C0] × 100%

[0025] For formaldehyde removal rates during the aging process of each material, please refer to [link / reference]. Figure 1 As shown,

[0026] Low-concentration aging treatment involves treating a formaldehyde concentration of 0.3-0.5 ppm (the formaldehyde concentration in a 6L chamber corresponds to 5-8 ppm for a 100L chamber). Formaldehyde solution is injected into the 6L test chamber onto the heater surface (the formaldehyde gas concentration is controlled to be approximately 5 ppm; this concentration is estimated based on the amount of formaldehyde added, as the instrument cannot measure it precisely). The heating element is turned on, and after complete evaporation, it is turned off. The module's odor-eliminating function and circulating fan are then activated. This process is repeated twice daily for 2 hours each time, with one week constituting one cycle. The module's single-cycle formaldehyde removal performance is tested once per cycle, and the formaldehyde removal amount is calculated using the following formula.

[0027] Y = C * 1.2 * V

[0028] In the formula, Y represents the amount of formaldehyde removed during aging (mg).

[0029] C – Total concentration of aging treatment (ppm)

[0030] V — Test chamber volume (m³) 3 )

[0031] 1.2 — Formaldehyde ppm converted to mg / m³ 3 coefficient

[0032] Since formaldehyde concentration values ​​before and after the aging process were not available, the formaldehyde removal rate for each aging period could not be calculated. Therefore, an estimation method was used to calculate the average formaldehyde removal rate over 40 days; this average removal rate was then used to calculate the treatment capacity. The initial formaldehyde concentration was calculated as 0.5 ppm for a 100L storage tank. The average removal rate and average residual amount for each material are shown below. Figure 2 As shown, the formula for calculating the total processing volume is:

[0033] M = M0 + M1

[0034] In the formula:

[0035] M — The final formaldehyde removal capacity of the module (mg)

[0036] M0—Total amount processed during the aging process at the end of the module's lifespan (mg);

[0037] M1—Total formaldehyde removed in a single removal process (mg);

[0038] Module lifespan is calculated using the following formula:

[0039]

[0040] In the formula:

[0041] Tm — Module lifespan, in years. Test results are retained to one significant figure.

[0042] n — the number of times the module has undergone aging treatment at the end of its lifespan;

[0043] Xi — Formaldehyde removal amount (mg) during the i-th aging treatment;

[0044] Yi — Formaldehyde removal amount (mg) in the odor removal rate test after the i-th aging treatment;

[0045] C limit – The daily safe concentration limit for formaldehyde gas is 0.08 mg / m3;

[0046] V – Test chamber volume (m³)

[0047] 365 — a constant.

[0048] Based on this formula, after one month of aging test, the catalyst removes 4.1 mg of formaldehyde, so the corresponding usage time in a 100L test chamber is 1.4 years.

[0049] The beneficial effects of this invention are as follows: The aging life test method for the deodorizing module of this invention achieves long-term evaluation of the performance and lifespan of catalyst materials in a low-concentration formaldehyde environment through precise control of experimental conditions and standardized testing procedures. This method not only provides accurate data recording and analysis but also predicts the module's lifespan through scientific calculations. Attached Figure Description

[0050] Figure 1 This is a flowchart illustrating the testing method of the present invention;

[0051] Figure 2 This is a table illustrating the single formaldehyde removal rate of each honeycomb catalyst after each aging cycle of the present invention.

[0052] Figure 3 This table illustrates the average formaldehyde removal rate, average treatment capacity, and total treatment capacity of each honeycomb catalyst of the present invention during the low-concentration aging process.

[0053] Figure 4 This is a table illustrating the total processing capacity of each honeycomb catalyst in this invention at a single removal rate. Detailed Implementation

[0054] See Figures 1 to 4 As shown, a method for testing the aging life of an odor removal module under low formaldehyde concentration includes the following steps:

[0055] S1. Prepare the test apparatus: Use a sealed test chamber with a volume V1 of 100L as the test chamber and a sealed test chamber with a solvent V2 of 6L as the aging chamber. The sealed test chamber is made of acrylic and contains heating elements, a circulating fan, valves, a purification device, and a sample injection needle. The test sample is a honeycomb catalyst, and formaldehyde solution is used as the test pollutant.

[0056] S2. Set up the test environment: Control the temperature in the laboratory at 22-25℃ and the relative humidity at 50-60%;

[0057] S3. Initial formaldehyde removal rate test: Place at least three test samples together in the test chamber, with the module and circulating fan placed parallel to each other. After placement, close the test chamber and inject formaldehyde solution into the surface of the heater in the test chamber through the injection needle. Turn on the heating element and wait for it to completely evaporate before turning it off. Turn on the circulating fan in the test chamber and monitor the formaldehyde concentration in the test chamber. After the formaldehyde concentration stabilizes, record the initial concentration C0. Turn on the purification device and run it for 1 hour, then record the final concentration C1. Calculate the formaldehyde removal rate η0.

[0058] S4. Low-concentration aging treatment: Inject formaldehyde solution into the 6L aging chamber through the injection needle onto the surface of the heating element. The formaldehyde concentration in the aging chamber is controlled to be less than 1.0 ppm. Turn on the heating element and wait for it to completely evaporate. Then turn off the heating element and turn on the module's deodorization function and the circulating fan.

[0059] S5. Results Recording: Record the formaldehyde removal rate and formaldehyde treatment amount of each material during the aging process, and calculate the module lifespan;

[0060] The dimensions of the test sample in S1 are 65mm*20mm*20mm;

[0061] In test chamber S3, the formaldehyde concentration was controlled at 1.0 ± 0.05 ppm.

[0062] The formaldehyde concentration in S4 is 0.3-0.5 ppm;

[0063] In S4, each test sample underwent a low-concentration aging treatment twice a day.

[0064] The low-concentration aging treatment time in S4 is 2 hours each time;

[0065] In S4, the formaldehyde removal performance of each test sample is tested every seven days.

[0066] Using the above technical solution, the removal rate calculation formula in S3 is as follows:

[0067] η0 = [(C0-C1) / C0] × 100%

[0068] For formaldehyde removal rates during the aging process of each material, please refer to [link / reference]. Figure 1 As shown (Figure 1 (The data in the original text is incomplete, but it can be further calculated based on the formula.)

[0069] Low-concentration aging treatment involves treating a formaldehyde concentration of 0.3-0.5 ppm (the formaldehyde concentration in a 6L chamber corresponds to 5-8 ppm for a 100L chamber). Formaldehyde solution is injected into the 6L test chamber onto the heater surface (the formaldehyde gas concentration is controlled to be approximately 5 ppm; this concentration is estimated based on the amount of formaldehyde added, as the instrument cannot measure it precisely). The heating element is turned on, and after complete evaporation, it is turned off. The module's odor-eliminating function and circulating fan are then activated. This process is repeated twice daily for 2 hours each time, with one week constituting one cycle. The module's single-cycle formaldehyde removal performance is tested once per cycle, and the formaldehyde removal amount is calculated using the following formula.

[0070] Y = C * 1.2 * V

[0071] In the formula, Y represents the amount of formaldehyde removed during aging (mg).

[0072] C – Total concentration of aging treatment (ppm)

[0073] V — Test chamber volume (m³) 3 )

[0074] 1.2 — Formaldehyde ppm converted to mg / m³ 3 coefficient

[0075] Since formaldehyde concentration values ​​before and after the aging process were not available, the formaldehyde removal rate for each aging period could not be calculated. Therefore, an estimation method was used to calculate the average formaldehyde removal rate over 40 days; this average removal rate was then used to calculate the treatment capacity. The initial formaldehyde concentration was calculated as 0.5 ppm for a 100L storage tank. The average removal rate and average residual amount for each material are shown below. Figure 2 As shown, the formula for calculating the total processing volume is:

[0076] M = M0 + M1

[0077] In the formula:

[0078] M — The final formaldehyde removal capacity of the module (mg)

[0079] M0—Total amount processed during the aging process at the end of the module's lifespan (mg);

[0080] M1—Total formaldehyde removed in a single removal process (mg);

[0081] Module lifespan is calculated using the following formula:

[0082]

[0083] In the formula:

[0084] Tm — Module lifespan, in years. Test results are retained to one significant figure.

[0085] n — the number of times the module has undergone aging treatment at the end of its lifespan;

[0086] Xi — Formaldehyde removal amount (mg) during the i-th aging treatment;

[0087] Yi — Formaldehyde removal amount (mg) in the odor removal rate test after the i-th aging treatment;

[0088] C limit – The daily safe concentration limit for formaldehyde gas is 0.08 mg / m3;

[0089] V – Test chamber volume (m³)

[0090] 365 — a constant.

[0091] Based on this formula, after one month of aging test, the catalyst removes 4.1 mg of formaldehyde, so the corresponding usage time in a 100L test chamber is 1.4 years.

[0092] The beneficial effects of this invention are as follows: The aging life test method for the deodorizing module of this invention achieves long-term evaluation of the performance and lifespan of catalyst materials in a low-concentration formaldehyde environment through precise control of experimental conditions and standardized testing procedures. This method not only provides accurate data recording and analysis but also predicts the module's lifespan through scientific calculations.

Claims

1. A method for testing the aging life of a deodorization module at low concentration of formaldehyde, comprising the following steps, S1. Preparing the test device: taking a sealed test box with a volume V1 of 100 L as the test chamber, and a sealed test box with a solvent V2 of 6 L as the aging chamber, the material of the sealed test box is acrylic and contains heating sheets, circulating fans, valves, purification devices, and sampling needles; the test sample is a honeycomb catalyst, and formaldehyde solution is used as the test pollutant; S2. Building the test environment: controlling the temperature in the laboratory to be 22-25℃ and the relative humidity to be 50-60%; S3. Initial formaldehyde removal rate test: placing at least three test samples together in the test chamber, placing the module parallel to the circulating fan, closing the test chamber after placing, injecting formaldehyde solution onto the surface of the heater in the test chamber through the sampling needle, turning on the heating sheets, waiting for complete volatilization, turning off the heating sheets, turning on the circulating fan in the test chamber, monitoring the formaldehyde concentration in the test chamber, recording the initial concentration C0 when the formaldehyde concentration is stable, turning on the purification device and running for 1 h, recording the final concentration C1, and calculating the formaldehyde removal rate η0; S4. Low concentration aging treatment: injecting formaldehyde solution into the surface of the heating sheets in the 6 L aging chamber through the sampling needle, controlling the formaldehyde concentration in the aging chamber to be less than 1.0 ppm, turning on the heating sheets, waiting for complete volatilization, turning off the heating sheets, and turning on the module deodorization function and the circulating fan; S5. Recording the results: recording the formaldehyde removal rate and formaldehyde treatment amount of each material during the aging process, and calculating the module life.

2. The method for testing the aging life of the odor removal module under low concentration formaldehyde according to claim 1, wherein: The size of the test sample in S1 is 65mm*20mm*20mm.

3. The method according to claim 1, wherein the method is used for testing the aging life of the odor removal module under low concentration of formaldehyde. The formaldehyde concentration in the test chamber in S3 is controlled to be 1.0±0.05ppm.

4. The method for testing the aging life of the odor removal module under low concentration formaldehyde according to claim 1, characterized in that: The formaldehyde concentration in S4 is 0.3-0.5ppm.

5. The method for testing the aging life of the odor removal module under low concentration formaldehyde according to claim 1, characterized in that: The low concentration aging treatment is repeated twice a day for each test sample in S4.

6. The method for testing the aging life of the odor removal module under low concentration formaldehyde according to claim 1, characterized in that: The time for each low concentration aging treatment in S4 is 2h.

7. The method for testing the aging life of the odor removal module under low concentration formaldehyde according to claim 1, characterized in that: The single formaldehyde removal performance of each test sample is tested every seven days in S4.

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