Whole house purification system and method based on full visible light excitation photocatalyst

Abstract

The invention relates to a whole house purification system and method based on a full visible light excitation photocatalyst, and the method comprises the steps: uniformly mixing a pre-prepared visible light photocatalyst with a coating and paint required by room decoration engineering according to a set proportion to obtain a prepared visible light photocatalyst purification material, and spraying the prepared visible light photocatalyst purification material on the surfaces of room walls and ceilings; according to indoor and outdoor temperature changes and humidity changes, heating equipment, refrigerating equipment, dehumidifying equipment and humidifying equipment in a room are used for maintaining the temperature and humidity in the room within a set range, an air inlet and an air return opening are used for ventilating the room within a set time period, and natural light or an illuminating lamp in the room is used during the period. And a visible light photocatalyst in the purification material is excited. The decoration material containing the visible light photocatalyst is sprayed to the surfaces of walls and ceilings, and the visible light photocatalyst is excited by natural light or an illuminating lamp to decompose harmful substances overflowing from the decoration material.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental engineering, and in particular to a whole-house purification system and method based on full visible light-excited photocatalyst. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] With the widespread use of various decoration materials, the problem of indoor air pollution is becoming increasingly serious, especially the harmful gases such as formaldehyde, benzene, volatile organic compounds (VOCs) released during the decoration process, which cause harm to the environment and people.

[0004] In response to the above problems, traditional indoor air purification equipment mainly purifies the air through filtration (such as HEPA filters) and adsorption (such as activated carbon filters), which can effectively remove dust, pollen and volatile organic compounds. However, these methods have limitations in efficiency, safety and long-term effects. Filters need to be replaced regularly and may cause reverse pollution. Some equipment may also release harmful ozone.

[0005] Photocatalyst technology uses photocatalyst materials to convert light energy into chemical energy under certain light irradiation, thereby promoting chemical reactions or material decomposition. Due to its high efficiency and environmental protection characteristics, photocatalyst technology can effectively decompose harmful substances released by interior decoration materials in the long term and purify the indoor air environment. However, since photocatalyst technology usually uses ultraviolet light as an excitation, it faces high cost and safety issues. Summary of the invention

[0006] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a whole-house purification system and method based on full visible light excitation photocatalyst, which can make full use of the visible light emitted by natural light sources and artificial light sources to purify the indoor environment comprehensively, efficiently and safely. The full visible light excitation photocatalyst generates superoxide radicals and hydroxyl radicals under visible light irradiation, decomposes harmful substances such as formaldehyde and VOCS into harmless carbon dioxide and water, has the ability to kill bacteria and viruses, overcomes the defects of traditional ultraviolet excitation, and will not cause harm to the human body; and as a photocatalyst, it does not participate in the reaction and is not consumed, so the photocatalyst is long-term and continuous. It is suitable for the house environment after decoration, so as to effectively improve the indoor air quality, protect the health of the residents, and meet people's demand for a healthy living environment.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] The first aspect of the present invention provides a whole-house purification method based on full visible light excited photocatalyst, comprising the following steps:

[0009] The pre-prepared visible light photocatalyst is mixed evenly with the coating and paint required for the room decoration project according to a set ratio to obtain a prepared visible light photocatalyst purification material;

[0010] According to the construction requirements of the decoration project, the prepared visible light photocatalyst purification material is sprayed on the surface of the room walls and ceilings;

[0011] According to the changes in indoor and outdoor temperature and humidity, the heating equipment, cooling equipment, dehumidification equipment and humidification equipment in the room are used to maintain the temperature and humidity in the room within the set range, and the air inlet and return air vents are used to ventilate the room during the set time period. During this period, natural light or lighting in the room is used to stimulate the visible light photocatalyst in the purification material to decompose harmful substances in coatings and paints.

[0012] Furthermore, the pre-prepared visible light photocatalyst is mixed evenly with the coating and paint required for the room decoration project according to a set ratio, wherein the added amount of the visible light photocatalyst material is not less than 0.5%.

[0013] Furthermore, the air inlet and return air outlet of the room are specifically: the air inlet and return air outlet of the heating device or the cooling device, and the window between the room and the external environment.

[0014] Furthermore, when the outdoor temperature is lower than the set value, the air inlet and return air outlet of the room are closed, the heating device is started, and the heating device is used to heat the air in the room; when the indoor temperature exceeds the set value and is maintained for a set time period, the air inlet and return air outlet of the room are opened to remove pollutants in the room.

[0015] Furthermore, when the outdoor temperature is lower than the set value and the indoor temperature exceeds the set value, the heating device is turned off, the air inlet and return air outlet of the room are closed, and the ventilation equipment in the room is started; when the indoor temperature exceeds the set value and maintains for a set time period, the air inlet and return air outlet of the room are opened to remove pollutants in the room.

[0016] Furthermore, when the outdoor temperature exceeds a set value, the air inlet and return air outlet of the room are opened to ventilate the room using the external ambient air.

[0017] Furthermore, when the outdoor temperature and indoor humidity exceed the corresponding set values, the humidity in the room is maintained at 50%-60% during the set time period using the dehumidification equipment pre-arranged in the room.

[0018] Furthermore, when the outdoor temperature and indoor humidity are lower than the corresponding set values, the humidity in the room is maintained at 40%-60% during the set time period using the humidification equipment pre-arranged in the room.

[0019] The second aspect of the present invention provides a whole-house purification system based on full visible light excited photocatalyst, comprising:

[0020] The visible light photocatalyst purification material spraying module is used to spray the coating and paint containing visible light photocatalyst on the surface of the room wall and ceiling during the construction of the room decoration project;

[0021] A visible light source excitation module is used to emit visible light to excite the visible light photocatalyst in the purification material;

[0022] Environmental parameter acquisition device, used to obtain indoor and outdoor temperature and humidity changes;

[0023] The controller is respectively connected to the environmental parameter acquisition device, and the heating equipment, cooling equipment, ventilation equipment and lighting equipment in the room, and is used to control the operation of the heating equipment, cooling equipment and ventilation equipment according to the changes in outdoor temperature and humidity.

[0024] Furthermore, the visible light source excitation module includes a lighting device arranged in the room.

[0025] Furthermore, the device is provided with a dehumidifying device and a humidifying device, and the dehumidifying device and the humidifying device are controlled by a controller to make the humidity in the room within a set range.

[0026] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0027] During the construction of the room decoration project, the visible light photocatalyst is mixed with the decoration materials to form a purification material, so that the decoration materials that may produce harmful substances are covered by the visible light photocatalyst, and the visible light photocatalyst is excited by natural light or artificial visible light emitted by lighting lamps, and the generated superoxide free radicals and hydroxyl free radicals are used to decompose the harmful substances overflowed from the decoration materials. During this period, the temperature and humidity inside and outside the room are monitored, and the heating equipment, cooling equipment, humidification equipment and dehumidification equipment in the room are coordinated during the set time period, as well as the air circulation inside the room and ventilation to the outside can effectively enhance the purification effect of the photocatalyst, help reduce the concentration of harmful substances such as indoor formaldehyde, thereby improving the air quality and living environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] Figure 1 It is a schematic diagram of the structure of a whole-house purification system provided by one or more embodiments of the present invention.

[0030] In the picture: 1. Wall; 2. Hanging lamp; 3. Fan; 4. Wardrobe; 5. Cabinet lamp; 6. Air conditioner; 7. Air outlet; 8. Return air outlet; 9. Window; 10. Sunlight; 11. Skirting board; 12. Ceiling. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0033] The following embodiment provides a whole-house purification system and method based on full visible light excitation photocatalyst. By reasonably setting the switching strategy of air conditioners and external windows, and the use strategy of lamps during the day and at night, the purification effect of photocatalyst can be effectively enhanced, helping to reduce the concentration of harmful substances such as formaldehyde in the room, thereby improving air quality and living environment.

[0034] Embodiment 1:

[0035] A whole-house purification method based on full visible light excited photocatalyst comprises the following steps:

[0036] The pre-prepared visible light photocatalyst is mixed evenly with the coating and paint required for the room decoration project according to a set ratio to obtain a prepared visible light photocatalyst purification material;

[0037] Spray the prepared visible light photocatalyst purification material on the surface of the room walls and ceiling, the outside of the equipment protruding from the wall and ceiling surface, and the air inlet and return air outlet of the room;

[0038] According to the changes in indoor and outdoor temperature and humidity, the heating equipment or cooling equipment in the room is used to maintain the temperature and humidity in the room within the set range, and the air inlet and return air vents are used to ventilate the room during the set time period. During this period, natural light or lighting in the room is used to stimulate the visible light photocatalyst in the purification material.

[0039] The heating device, cooling device and dehumidifying device in this embodiment are integrated in the air conditioner, and the ventilation device can be a fan in the room, or the air conditioner can be used to achieve ventilation in the room.

[0040] In this embodiment, the visible light photocatalyst may be a photo-semiconductor material with photocatalytic function represented by nano-scale titanium dioxide (TiO2), which can produce a strong catalytic degradation function under the action of visible light.

[0041] Under visible light, photocatalyst materials can absorb light energy and excite electrons. These electrons combine with oxygen molecules in the air to generate negative oxygen ions that are beneficial to the human body. At the same time, holes combine with water molecules to generate hydroxyl free radicals with strong oxidizing effects. These active groups can oxidize and decompose harmful gases, pollutants, and bacteria such as formaldehyde, benzene, toluene, xylene, ammonia, TVOC, etc. in the air, and convert them into harmless carbon dioxide and water, thereby achieving the effect of air purification and disinfection.

[0042] In this embodiment, the full visible light photocatalyst is a photocatalyst material that can exert a photocatalytic effect in the full visible light range (ie, light with a wavelength between 400 and 700 nanometers).

[0043] Preparation of all-visible light photocatalyst purification materials.

[0044] During the decoration process, the visible light photocatalyst paint is evenly mixed with latex paint, wherein the amount of visible light photocatalyst material added is not less than 0.5%, and applied to the walls and ceilings in the room. In addition, the photocatalyst paint is evenly mixed with glue and used for indoor decoration skirting or furniture installation, wherein the amount of visible light photocatalyst material added is not less than 0.5%.

[0045] Full visible light photocatalyst surface spraying.

[0046] by Figure 1 Taking the room shown as an example, the room has a wall 1, a hanging lamp 2, a fan 3, a wardrobe 4, a cabinet lamp 5, an air conditioner 6, an air outlet 7 of the air conditioner, an air return 8 of the air conditioner, a window 9, a skirting 11 and a ceiling 12. Sunlight 10 is projected into the room through the window 9.

[0047] After the decoration work is completed, the entire house surface is evenly sprayed with visible light-excited photocatalyst. Figure 1 The wall 1 and the ceiling 12 etc.

[0048] After spraying, the room air was tested. The formaldehyde sensor performed a preliminary measurement and the result showed: formaldehyde concentration: 0.6mg / m3.

[0049] When the outdoor temperature is low and the indoor temperature is relatively low, the volatilization rate of indoor pollutants such as formaldehyde is relatively slow; at this time, turn on the heating mode of the air conditioner and the fan, close the windows, increase the indoor air temperature and air flow rate, and promote the release of pollutants in indoor decoration and decorative materials. At the same time, higher indoor temperature and air flow rate help to improve the purification effect of photocatalysts. When the indoor temperature is maintained at a high level for a period of time, the indoor pollutants can be removed by opening the external windows for a period of time.

[0050] When the outdoor temperature is low and the indoor temperature is high (such as a heated room), turn off the air conditioner's heating mode, close the windows, turn on the air conditioner's air supply mode or fan, increase the air flow rate in the room, promote the contact between indoor pollutants and the full visible light-excited photocatalyst, and improve the purification efficiency of the whole house. When the indoor temperature is high for a period of time, remove indoor pollutants by opening the external windows for a period of time.

[0051] When the outdoor temperature is high (the indoor temperature is low or high), open the outer windows, turn on the fan, turn off the air conditioner heating / cooling mode, increase the indoor air temperature, and speed up the release of pollutants such as formaldehyde.

[0052] When the indoor humidity is too high in summer or too low in winter, the activity of the photocatalyst may be inhibited. Therefore, when the indoor humidity is high in summer, start the dehumidification mode of the air conditioner to appropriately reduce the air humidity; when the indoor humidity is low in winter, use a humidifier to increase the relative humidity in the room, thereby ensuring the purification effect of the full-light-excited photocatalyst.

[0053] When the weather is clear during the day, natural light is used first to stimulate the photocatalyst; on rainy days with weak light or in the morning and evening when there is insufficient light, turn on the indoor lighting and light strips to stimulate the photocatalyst and improve the purification effect by controlling the light. At night, the light can be turned on for a long time to stimulate the photocatalyst to maintain a continuous purification effect.

[0054] By reasonably setting the switching strategies of air conditioners and external windows, and the use strategies of lamps during the day and at night, the purification effect of photocatalysts can be effectively enhanced, helping to reduce the concentration of harmful substances such as indoor formaldehyde, thereby improving air quality and living environment.

[0055] In this embodiment, in winter, when the room is not heated, the indoor temperature is also low, and the volatilization rate of indoor pollutants such as formaldehyde is relatively slow; the indoor temperature is low in the morning and evening, such as 5:00-9:00 in the morning and 17:00-22:00 in the evening. When the indoor temperature is lower than 18°C, turn on the heating mode of the air conditioner, set the room temperature to 24°C, close the windows, increase the indoor air temperature, and turn on the fan to increase the indoor air flow rate, which promotes the release of pollutants in indoor decoration and decorative materials. At the same time, the higher indoor temperature and air flow rate help to improve the purification effect of the photocatalyst. When the indoor temperature is maintained for a period of time, turn off the air conditioning heating, open the windows for ventilation for 1 to 2 hours, enhance indoor air circulation, and remove indoor pollutants.

[0056] In this embodiment, in winter, the room is heated and the indoor temperature is between 18°C ​​and 24°C. That is, when the outdoor temperature is low and the indoor temperature is high, turn off the heating mode of the air conditioner and close the windows to keep the room warm. Turn on the air supply mode or fan of the air conditioner to increase the air flow speed, promote the full contact between pollutants and photocatalysts, and enhance the air purification effect. When the indoor temperature is maintained at a high level for a period of time, open the window for ventilation for 1 to 2 hours to enhance indoor air circulation, remove indoor pollutants, and ensure fresh air.

[0057] In the present embodiment, in summer, when the outdoor temperature is high, whether the indoor temperature is low or high, the indoor air flow should be improved by opening the outer window and using a fan. Opening the window can introduce outdoor warm air, help the indoor temperature to gradually rise, thereby accelerating the release of indoor pollutants such as formaldehyde. At the same time, turning on the fan can increase air convection, promote the volatilization of indoor pollutants, make them better contact with photocatalysts, and improve air purification efficiency. At this time, the heating or cooling mode of the air conditioner should be turned off to avoid the temperature control effect of the air conditioner from inhibiting the natural change of indoor temperature and air flow. In this way, the release and purification of pollutants can be effectively accelerated at higher outdoor temperatures, ensuring the improvement of indoor air quality. It is recommended to open windows for ventilation during the daytime period when the outdoor temperature is higher (such as 10:00-12:00 in the morning or 14:00-16:00 in the afternoon), so that the indoor temperature rises naturally, accelerates the release of pollutants, and improves air quality.

[0058] In this embodiment, when the indoor humidity is too high in summer or too low in winter, the photocatalyst effect may be inhibited. When the indoor humidity is too high in summer, the dehumidification mode of the air conditioner can be started at 9:00-11:00 in the morning and 14:00-16:00 in the afternoon to keep the indoor humidity between 50%-60% to help the photocatalyst work efficiently. When the indoor humidity is too low in winter, use a humidifier in the morning and evening to adjust the indoor humidity to 40%-60% to ensure that the purification effect of the photocatalyst is not affected. Through proper humidity adjustment, the best purification effect of the photocatalyst is guaranteed.

[0059] In this embodiment, when the weather is clear during the day and the indoor light intensity is higher than 50lux, natural light is used to excite the photocatalyst first. When the light is insufficient (lower than 50lux) in the morning and evening (such as 5:00-7:00 in the morning and 16:00-18:00 in the afternoon), the indoor lighting should be turned on to improve the purification effect. At night, the indoor lighting and the light strips in the wardrobe should be turned on to excite the photocatalyst through long-term low-intensity light to maintain a continuous purification effect, so as to ensure that the pollutants in the night air can be continuously decomposed, and the windows should be opened for ventilation for 1-2 hours in the morning.

[0060] According to the above method, after the purification system was operated for 15 days, the formaldehyde sensor was used for detection. The results showed that the formaldehyde concentration dropped to 0.2mg / m3, and the air quality was significantly improved. After one month of long-term operation, the room air was tested again. The air quality in the room was stable at a healthy level, and the formaldehyde concentration was less than 0.08mg / m3.

[0061] This example demonstrates the application of a purification system based on full visible light excitation photocatalyst in a typical residential bedroom environment. The system effectively purifies the air in the room by exciting with natural light and artificial light, and purifying with fans and air conditioners to circulate air, thus solving the problem of air pollution and ensuring comprehensive, efficient and safe purification.

[0062] Embodiment 2:

[0063] A whole-house purification system based on full visible light excited photocatalyst, comprising a full visible light photocatalyst purification module, a visible light source excitation module, an air circulation purification module, and a regular monitoring module;

[0064] The full visible light photocatalyst purification module consists of two parts: a decoration material submodule with purification function and a photocatalyst surface spraying submodule.

[0065] The decoration material submodule with purification function mainly includes latex paint with purification function and compound glue. The latex paint with purification function is to mix photocatalyst paint and latex paint evenly, and then apply it to the walls and ceilings in the room; the compound glue with purification function is to mix photocatalyst paint and glue evenly, and then use it in interior decoration, such as skirting or other furniture installation.

[0066] The photocatalyst surface spraying submodule is mainly used to evenly spray the entire house surface with visible light-excited photocatalyst after the construction of the decoration material submodule with purification function is completed, including walls, inner and outer surfaces of furniture, lamp surfaces, curtains, inner surfaces of exterior windows, air-conditioning outlets, return air outlets, fan blades, etc.

[0067] Visible light source excitation module. This module contains natural light source and artificial light source. Natural light source enters the room through the external window; artificial light source can be LED lamps or other lamps commonly used in decoration, such as the main lighting light source set on the ceiling of the room or other household light sources such as downlights and floor lamps, to ensure all-weather visible light catalyst excitation. At the same time, in order to purify furniture with more serious pollution, such as wardrobes, light strips are also installed inside the wardrobes. The light strips serve as the light source for photocatalyst excitation and also as the lighting fixture of the wardrobe.

[0068] The air circulation purification module mainly includes an air conditioner with a filter screen on the return air outlet and an air conditioner with a fully visible light-excited photocatalyst sprayed on the air outlet, and a fan with a fully visible light-excited photocatalyst sprayed on the blades. After turning on the air conditioner or fan, the indoor air begins to circulate, increasing the contact between the photocatalyst on the wall, the inner and outer surfaces of the furniture, the return air outlet, the air outlet, and the fan blades and pollutants in the air, which can effectively improve the purification efficiency and cover every corner of the room.

[0069] Regular monitoring module: Use formaldehyde sensors, temperature and humidity sensors, and light intensity sensors to regularly monitor indoor air quality, temperature, humidity, and lighting conditions, regularly check the spraying status of the photocatalyst, and re-spray when necessary to maintain its activity and effect.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A whole-house purification method based on full visible light excited photocatalyst, characterized in that: The following steps are involved: The pre-prepared visible light photocatalyst is mixed evenly with the coating and paint required for the room decoration project according to a set ratio to obtain a prepared visible light photocatalyst purification material; According to the construction requirements of the decoration project, the prepared visible light photocatalyst purification material is sprayed on the surface of the room walls and ceilings; According to the changes in indoor and outdoor temperature and humidity, the heating equipment, cooling equipment, dehumidification equipment and humidification equipment in the room are used to maintain the temperature and humidity in the room within the set range, and the air inlet and return air vents are used to ventilate the room during the set time period. During this period, natural light or lighting in the room is used to stimulate the visible light photocatalyst in the purification material to decompose harmful substances in coatings and paints.

2. A whole-house purification method based on full visible light excited photocatalyst as claimed in claim 1, characterized in that: The pre-prepared visible light photocatalyst is mixed evenly with the coating and paint required for the room decoration project according to a set ratio, wherein the added amount of the visible light photocatalyst material is not less than 0.5%.

3. A whole-house purification method based on full visible light excited photocatalyst as claimed in claim 1, characterized in that: When the outdoor temperature is lower than the set value, the air inlet and return air vents of the room are closed, the heating equipment is started, and the air in the room is heated by the heating equipment; when the indoor temperature exceeds the set value and is maintained for a set period of time, the air inlet and return air vents of the room are opened to remove pollutants in the room.

4. A whole-house purification method based on full visible light excited photocatalyst as claimed in claim 1, characterized in that: When the outdoor temperature is lower than the set value and the indoor temperature exceeds the set value, the heating equipment is turned off, the air inlet and return air outlet of the room are closed, and the ventilation equipment in the room is started; when the indoor temperature exceeds the set value and maintains for the set time period, the air inlet and return air outlet of the room are opened to remove pollutants in the room.

5. A whole-house purification method based on full visible light excited photocatalyst as claimed in claim 1, characterized in that: When the outdoor temperature exceeds the set value, the air inlet and return vents of the room are opened to use the external ambient air to ventilate the room.

6. A whole-house purification method based on full visible light excited photocatalyst as claimed in claim 1, characterized in that: When the outdoor temperature and indoor humidity exceed the corresponding set values, the dehumidification equipment pre-arranged in the room is used to maintain the humidity in the room at 50%-60% during the set time period.

7. A whole-house purification method based on full visible light excited photocatalyst as claimed in claim 1, characterized in that: When the outdoor temperature and indoor humidity are lower than the corresponding set values, the humidity in the room is maintained at 40%-60% during the set time period using the humidification equipment pre-arranged in the room.

8. A whole-house purification method based on full visible light excited photocatalyst as claimed in claim 1, characterized in that: The air inlets and returns of a room, specifically the air inlets and returns of heating or cooling equipment, and windows between the room and the outside environment.

9. A whole-house purification system based on full visible light excited photocatalyst, implemented based on the method described in any one of claims 1 to 8, characterized in that: include: The visible light photocatalyst purification material spraying module is used to spray the coating and paint containing visible light photocatalyst on the surface of the room wall and ceiling during the construction of the room decoration project; A visible light source excitation module, used to emit visible light to excite the visible light photocatalyst; Environmental parameter acquisition device, used to obtain indoor and outdoor temperature and humidity changes; The controller is respectively connected to the environmental parameter acquisition device, and the heating equipment, cooling equipment, ventilation equipment and lighting equipment in the room, and is used to control the operation of the heating equipment, cooling equipment and ventilation equipment according to the changes in outdoor temperature and humidity.

10. A whole-house purification system based on full visible light excited photocatalyst as claimed in claim 1, characterized in that: The utility model also has a dehumidification device and a humidification device, and the operation of the dehumidification device and the humidification device is controlled by a controller so that the humidity in the room is within a set range.

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