Storage device protected against formaldehyde polymerization

Abstract

This application discloses a storage device for preventing formaldehyde polymerization, relating to the field of formaldehyde storage devices. The storage device includes a composite tank, an internal heating assembly, and a control unit. The composite tank, from the outside in, comprises an outer protective layer, a hollow, heat-insulating interlayer, a heat insulation layer, a heating layer, and an inner structural layer, forming a multi-layered composite structure to enhance heat insulation and temperature control performance. Through the integrated action of multi-stage temperature regulation, directional circulating disturbance, and inert gas stirring, this device effectively inhibits formaldehyde molecule polymerization, making it suitable for long-term stable storage needs in large storage tank scenarios.

Description

Technical Field

[0001] This application relates to the field of formaldehyde storage devices, and in particular to a storage device that prevents formaldehyde polymerization. Background Technology

[0002] In the field of formaldehyde storage, existing technologies primarily maintain the temperature stability of the storage environment through constant-temperature heating or cooling systems, combined with mechanical stirring to slow down formaldehyde polymerization. For example, some devices employ a single-layer heating structure or external circulating water cooling technology to prevent formaldehyde polymerization caused by low temperatures or localized overheating through temperature regulation; simultaneously, mechanical stirrers periodically agitate the liquid to reduce formaldehyde molecule aggregation. This type of technology has achieved some success in small and medium-sized storage devices. Its principle lies in the relatively uniform temperature control within a limited volume and the controllable range of stirring, which can basically meet short-term storage needs.

[0003] However, existing technologies have significant drawbacks in large-scale storage applications. First, single temperature control methods are insufficient to achieve a uniform temperature field for large-volume liquid storage. For example, relying solely on external heating layers or internal heating rods can easily create temperature gradients between the liquid's center and edges, causing local temperature fluctuations to exceed the formaldehyde's stable range and thus inducing polymerization. Second, the stirring efficiency of traditional mechanical stirrers in large-scale liquids is significantly reduced. Due to the limited range of the stirring paddle, dead zones in the liquid are prone to localized excessively high formaldehyde concentrations. Furthermore, the high power consumption and severe equipment wear exacerbate the problem of insufficient stirring after long-term operation. More critically, friction between the stirring shaft and the sealing structure during mechanical stirring may introduce trace impurities or oxygen. Upon contact with formaldehyde, this may catalyze side reactions to form paraformaldehyde precipitates, further degrading the quality of the stored liquid. The root cause of these problems lies in the failure of existing technologies to systematically integrate temperature control, liquid circulation, and pollution-free stirring mechanisms, resulting in fragmented and even negatively impactful interactions between these components.

[0004] To address the aforementioned technical bottlenecks, the development of novel formaldehyde-resistant polymer storage devices has significant application value. Utility Model Content

[0005] The purpose of this application is to overcome at least one deficiency of the existing technology and provide a storage device that prevents formaldehyde polymerization. This device effectively inhibits formaldehyde molecule polymerization through the integrated action of multi-stage temperature control, directional circulation disturbance, and inert gas stirring, making it suitable for long-term stable storage needs in large storage tank scenarios.

[0006] To achieve the above objectives, this application discloses a storage device for preventing formaldehyde polymerization. The storage device includes a composite tank, a built-in heating component, and a control unit. The composite tank includes, from the outside to the inside, an outer protective layer, a hollow heat-insulating interlayer, a heat insulation layer, a heating layer, and an inner structural layer, forming a multi-layer composite structure to enhance heat insulation and temperature control performance.

[0007] The inner structural layer forms the storage cavity, with a first circulation port and a liquid outlet at the bottom and a second circulation port at the top. The first circulation port is connected to a circulation pump through a pipe, and the outlet of the circulation pump extends through a pipe to the top of the composite tank and connects with the second circulation port to form a closed circulation loop. This allows the stored liquid to flow directionally from the bottom to the top under the drive of the pump, promoting temperature equilibrium and dynamic mixing of the liquid in the composite tank.

[0008] The storage chamber is equipped with a perforated plate structure at the bottom. The perforated plate integrates air channels and has multiple air outlets that are evenly distributed on its surface. The air channels are connected to an external high-purity nitrogen source through an air supply pipe with an electric regulating valve. The rising bubbles generated by nitrogen injection achieve non-mechanical contact stirring of the liquid in the composite tank, avoiding the introduction of impurities.

[0009] Furthermore, the heating layer is composed of a circumferentially distributed annular array of heating elements, and multiple independently controlled heating units are arranged at intervals along the height direction of the composite tank, with each heating unit corresponding to an axial segmented area of ​​the composite tank.

[0010] Furthermore, the built-in heating component consists of multiple heating rod groups spaced apart along the height of the composite tank. Each heating rod group consists of resistance heating rods evenly distributed circumferentially on the inner wall of the composite tank, forming an internal and external synergistic heating structure together with the outer heating layer.

[0011] Furthermore, the composite tank is equipped with multiple temperature sensors along its height to monitor the liquid temperature at different axial positions in real time and connect them to the control unit. The control unit dynamically adjusts the power output of the corresponding heating unit and the operating parameters of the circulation pump based on the feedback data from the temperature sensors. At the same time, it controls the opening of the electric regulating valve to match the nitrogen intake under different liquid levels and storage conditions, thereby achieving coordinated optimization of temperature control, liquid circulation, and gas stirring.

[0012] Furthermore, a non-contact liquid level monitoring device is installed on the inner wall of the top of the composite tank. An ultrasonic sensor is used to detect the liquid level height vertically downwards. Its signal output terminal is connected to the control unit to acquire liquid level data in real time and calibrate the circulation pump flow rate and nitrogen intake strategy accordingly.

[0013] Furthermore, a high-temperature resistant insulation layer is provided between the heating layer and the inner structural layer to ensure heating uniformity and thermal efficiency.

[0014] Compared with the prior art, this application has at least one of the following beneficial technical effects:

[0015] 1. The combination of multi-stage temperature control and directional circulation disturbance can effectively solve the problem of uneven liquid temperature in large storage tanks, avoid formaldehyde polymerization reaction caused by local temperature fluctuations, and improve the stability of formaldehyde storage.

[0016] 2. The inert gas stirring system replaces the traditional mechanical stirring, realizing stirring without mechanical contact, avoiding the introduction of impurities and oxygen catalytic side reactions, reducing the formation of paraformaldehyde precipitates, and helping to maintain the quality of the stored liquid.

[0017] The beneficial effects listed above are not exhaustive of all advantages. Other potential beneficial effects and detailed technical implementation methods will be further disclosed in the embodiments or other descriptive sections of this application. Attached Figure Description

[0018] A better understanding of various aspects of this disclosure will be achieved by reading the following detailed description in conjunction with the accompanying drawings. The positions, dimensions, and extents of the structures shown in the drawings, etc., do not always represent actual positions, dimensions, and extents. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of one embodiment disclosed in this application.

[0020] Figure 2 This is a schematic diagram of the internal structure of one embodiment disclosed in this application.

[0021] Figure 3 This is a partial cross-sectional structural diagram of the composite tank in one embodiment of this application. Detailed Implementation

[0022] The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0023] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. For clarity, the dimensions of certain features may be modified in the drawings.

[0024] It should be understood that the terminology used in this specification is for describing specific embodiments only and is not intended to limit this disclosure. All terms used in this specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. For the sake of brevity and / or clarity, techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail; however, where appropriate, such techniques, methods, and apparatus should be considered part of this specification.

[0025] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0026] See attached document Figure 1-3 In this embodiment, a storage device for preventing formaldehyde polymerization is provided. The device mainly consists of a composite tank 1, an internal heating component 2, and a control unit 3. The composite tank 1 adopts a multi-layer composite structure, which includes, from the outside to the inside, an outer protective layer 101, a hollow heat-insulating interlayer 102, a heat-insulating layer 103, a heating layer 104, and an inner structural layer 105.

[0027] In the above structure, the outer protective layer 101 is generally made of fiberglass, which has good corrosion resistance and mechanical strength, and can effectively resist external physical impact and chemical erosion, ensuring the stability of the overall tank structure.

[0028] The hollow insulating interlayer 102 and the insulating layer 103 are filled with high-efficiency insulating material, which can effectively block heat transfer and reduce heat exchange between the tank and the external environment, thereby reducing energy consumption. The heating layer 104 is composed of a circumferentially distributed annular array of heating elements.

[0029] The built-in heating component 2 consists of multiple heating rod groups spaced apart along the height of the composite tank 1. Each heating rod group comprises resistance heating rods evenly distributed circumferentially on the inner wall of the composite tank, forming a synergistic heating structure with the outer heating layer. This design allows heat to be distributed more evenly throughout the entire interior of the composite tank 1, effectively avoiding localized excessively high or low temperatures and providing a stable storage environment for the formaldehyde solution.

[0030] The inner structural layer 105 forms the storage cavity 4, with a first circulation port and a liquid outlet at its bottom and a second circulation port at its top. The first circulation port is connected to the circulation pump 5 via a pipe, and the outlet of the circulation pump 5 extends through a pipe to the top of the composite tank 1 and connects with the second circulation port, forming a closed circulation loop. The circulation pump 5 can be a high-efficiency, low-noise magnetically driven pump, which can stably draw the stored liquid from the bottom and transport it to the top, causing the liquid to flow in a directional manner within the composite tank 1, thereby promoting the equalization of liquid temperature and dynamic mixing within the composite tank 1.

[0031] The storage chamber 4 has an orifice plate 6 installed at its inner bottom. This orifice plate 6 integrates air channels and has multiple evenly distributed air outlets communicating with these channels on its surface. The air channels are connected to an external high-purity nitrogen source via a gas supply pipe 7 equipped with an electrically adjustable valve. When nitrogen is injected, the resulting rising bubbles achieve non-mechanical contact stirring of the liquid within the composite tank 1, effectively avoiding the introduction of impurities that may occur with traditional mechanical stirring.

[0032] Control unit 3, as the core control component of the entire device, is connected to various mechanisms or units via signal lines. Multiple temperature sensors (not shown in the figure) are installed along the height of the composite tank 1 to monitor the liquid temperature at different axial positions in real time and transmit the monitoring data to control unit 3. Based on the received temperature feedback data, control unit 3 dynamically adjusts the power output of each heating unit and the operating parameters of the circulation pump 5, while simultaneously controlling the opening of the electric regulating valve to match the nitrogen intake under different liquid levels and storage conditions, thereby achieving coordinated optimization of temperature control, liquid circulation, and gas stirring.

[0033] In addition, a non-contact liquid level monitoring device (not shown in the figure) is installed on the inner wall of the top of the composite tank 1. This device uses an ultrasonic sensor to detect the liquid level vertically downward. Its signal output terminal is connected to the control unit 3 to acquire liquid level data in real time and calibrate the circulation pump flow rate and nitrogen intake strategy accordingly.

[0034] As a further optimization, a high-temperature resistant insulating layer is provided between the heating layer 104 and the inner structural layer 105. This layer can be made of high-performance ceramic fiber material to ensure heating uniformity and thermal efficiency.

[0035] In practical applications, taking the formaldehyde storage section of a large chemical enterprise as an example, when a large amount of formaldehyde solution needs to be stored, the liquid is first injected into the composite tank 1 through the inlet. At this time, the temperature sensor monitors the temperature at different locations inside the composite tank 1 in real time, and the control unit 3 precisely controls the power of each heating unit based on the monitoring data, so that the temperature inside the composite tank 1 is stably maintained within the suitable range for formaldehyde storage. Simultaneously, the circulation pump 5 starts, driving the liquid to be drawn in from the first circulation port at the bottom, transported through the pipeline to the second circulation port at the top for discharge, forming a directional circulation flow, further equalizing the temperature inside the composite tank 1. The nitrogen stirring system controls the amount of nitrogen injected by adjusting the opening of the electric regulating valve according to the controller's instructions. The generated bubbles rise and drive the liquid to perform non-mechanical contact stirring, avoiding formaldehyde polymerization caused by excessively high local concentrations, and preventing the introduction of impurities. Compared with traditional storage equipment with mechanical stirring and single temperature control, the polymerization phenomenon of formaldehyde solution is significantly reduced by using the storage device of this embodiment, the solution quality is significantly improved, the storage period is extended by about 30%, and the maintenance cost of the equipment is reduced by about 40%. This effectively meets the needs of enterprises for long-term stable storage of formaldehyde and greatly improves production efficiency and economic benefits.

[0036] It should be noted that in this embodiment, parts such as pipe connection methods and specific installation and fixing methods of various components that are not described in detail are all within the scope of well-known and existing technologies for those skilled in the art. Those skilled in the art can select and implement them according to actual needs and conventional technical means. For example, the connection between pipes and various components can adopt common connection methods such as flange connection and welding; the installation, fixing and wiring of various electronic components such as sensors and controllers can be carried out according to conventional technologies in the art, and will not be described in detail here.

[0037] While exemplary embodiments of this disclosure have been described, those skilled in the art will understand that various changes and modifications can be made to the exemplary embodiments of this disclosure without departing from the spirit and scope thereof. Therefore, all changes and modifications are included within the scope of protection of this disclosure as defined by the claims. This disclosure is defined by the appended claims, and equivalents of those claims are also included.

Claims

1. A storage device for preventing formaldehyde polymerization, characterized in that, The storage device includes a composite tank, an internal heating component, and a control unit. The composite tank, from the outside to the inside, includes an outer protective layer, a hollow heat-insulating interlayer, a heat insulation layer, a heating layer, and an inner structural layer, forming a multi-layer composite structure to enhance heat insulation and temperature control performance. The inner structural layer forms a storage cavity, with a first circulation port and a liquid outlet at the bottom and a second circulation port at the top. The first circulation port is connected to a circulation pump through a pipe, and the outlet of the circulation pump extends through a pipe to the top of the composite tank and connects with the second circulation port to form a closed circulation loop. This allows the stored liquid to flow directionally from the bottom to the top under the pump drive, promoting the temperature balance and dynamic mixing of the liquid in the composite tank. The storage chamber is equipped with a perforated plate structure at the bottom. The perforated plate integrates air channels and has multiple air outlets that are evenly distributed on its surface. The air channels are connected to an external high-purity nitrogen source through an air supply pipe with an electric regulating valve. The rising bubbles generated by nitrogen injection achieve non-mechanical contact stirring of the liquid in the composite tank, avoiding the introduction of impurities.

2. The storage device for preventing formaldehyde polymerization as described in claim 1, characterized in that, The heating layer consists of a circumferentially distributed annular array of heating elements, with multiple independently controlled heating units spaced apart along the height of the composite tank. Each heating unit corresponds to an axial segment of the composite tank.

3. The storage device for preventing formaldehyde polymerization as described in claim 1, characterized in that, The built-in heating component consists of multiple heating rod groups spaced apart along the height of the composite tank. Each heating rod group consists of resistance heating rods evenly distributed circumferentially on the inner wall of the composite tank, forming a coordinated internal and external heating structure together with the outer heating layer.

4. The storage device for preventing formaldehyde polymerization as described in claim 1, characterized in that, The composite tank is equipped with multiple temperature sensors along its height to monitor the liquid temperature at different axial positions in real time, and these sensors are connected to the control unit.

5. A storage device for preventing formaldehyde polymerization as described in claim 1, characterized in that, The composite tank is equipped with a non-contact liquid level monitoring device on the inner wall of the top. It uses an ultrasonic sensor to detect the liquid level vertically downward. Its signal output terminal is connected to the control unit to acquire liquid level data in real time and calibrate the circulation pump flow rate and nitrogen intake strategy accordingly.

6. The storage device for preventing formaldehyde polymerization as described in claim 1, characterized in that, A high-temperature resistant insulation layer is installed between the heating layer and the inner structural layer to ensure heating uniformity and thermal efficiency.

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