Formaldehyde concentration system

Abstract

The utility model provides a formaldehyde concentration system which is provided with a formaldehyde concentration flow path and a cleaning flow path, the formaldehyde concentration system comprises a formaldehyde concentration assembly arranged on the formaldehyde concentration flow path, and the formaldehyde concentration assembly is used for concentrating a formaldehyde solution flowing from the inlet side of the formaldehyde concentration flow path to the outlet side of the formaldehyde concentration flow path. The formaldehyde concentration flow path and the formaldehyde concentration assembly are filled with cleaning liquid through the cleaning flow path so as to clean paraformaldehyde in the formaldehyde concentration flow path and the formaldehyde concentration assembly, the cleaning flow path comprises a liquid inlet flow path and a liquid discharge flow path, and the liquid inlet flow path is communicated with the inlet side of the formaldehyde concentration flow path in an on-off mode to form a first communication position; the liquid discharge flow path is communicated with the outlet side of the formaldehyde concentration flow path in an on-off manner to form a second communication position, and the formaldehyde concentration assembly is located between the first communication position and the second communication position. According to the technical scheme provided by the utility model, the cleaning effect on paraformaldehyde in the formaldehyde concentration flow path can be improved while the formaldehyde concentration effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of formaldehyde concentration, in particular to a formaldehyde concentration system. Background Art

[0002] In the triformaldehyde synthesis reaction, the concentration of the feed formaldehyde is usually increased to improve the triformaldehyde conversion rate. Therefore, the formaldehyde solution is concentrated before the triformaldehyde synthesis reaction. The formaldehyde solution is flash-evaporated by heating and reducing pressure to evaporate water and some formaldehyde from the formaldehyde solution, leaving a higher-concentration formaldehyde solution to provide raw material for subsequent processes. However, during the formaldehyde concentration process, the negative pressure flash evaporation and the instantaneous increase in formaldehyde concentration can form formaldehyde polymers. These polymers can easily clog pump lines and filters, hindering the long-term operation of the system.

[0003] In order to ensure the long-term operation of the concentration system, the existing technology adopts the method of reducing the vacuum degree of the concentration system to control the flash evaporation effect and prevent the formation of paraformaldehyde. However, this method will affect the concentration effect, and thus affect the formaldehyde concentration and output of the discharge. On the other hand, the existing technology often uses water washing to clean the paraformaldehyde. After the water washing is completed, the machine pump inlet filter needs to be manually removed and cleaned, and then it is ready for use. However, this cleaning method displaces a large amount of water, which will affect the indicators of the discharged wastewater, and requires the removal and cleaning of pipelines, etc., which poses safety risks such as the leakage of harmful media, and the problem that some dead zones and elbows in the pipeline cannot be removed and cleaned or the cleaning is not thorough. Utility Model Content

[0004] The utility model provides a formaldehyde concentration system, which can improve the cleaning effect of paraformaldehyde in a formaldehyde concentration flow path while ensuring the formaldehyde concentration effect.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a formaldehyde concentration system, which has a formaldehyde concentration flow path and a cleaning flow path. The formaldehyde concentration system includes a formaldehyde concentration component arranged on the formaldehyde concentration flow path, the formaldehyde concentration component is used to concentrate the formaldehyde solution flowing from the inlet side of the formaldehyde concentration flow path to the outlet side of the formaldehyde concentration flow path, the cleaning flow path fills the formaldehyde concentration flow path and the formaldehyde concentration component with cleaning liquid to clean the polyformaldehyde therein, the cleaning flow path includes an inlet flow path and a discharge flow path, the inlet flow path is connectable and disconnectable to the inlet side of the formaldehyde concentration flow path and forms a first connection position, the discharge flow path is connectable and disconnectable to the outlet side of the formaldehyde concentration flow path and forms a second connection position, and the formaldehyde concentration component is located between the first connection position and the second connection position.

[0006] Furthermore, the formaldehyde concentration component includes a refined formaldehyde heater and a cyclone separator. The refined formaldehyde heater and the cyclone separator are sequentially arranged on the formaldehyde concentration flow path between the first connecting position and the second connecting position in the direction from the inlet side of the formaldehyde concentration flow path to the outlet side of the formaldehyde concentration flow path. The upper side of the refined formaldehyde heater has a steam inlet for charging heating steam into the interior of the refined formaldehyde heater. The cyclone separator is used to separate the concentrated formaldehyde solution from the vapor phase discharged from the refined formaldehyde heater.

[0007] Furthermore, the formaldehyde concentration system also includes a vapor phase treatment device connected to the vapor phase outlet above the cyclone separator. The vapor phase treatment device has a water inlet for charging circulating water mixed with the vapor phase discharged from the cyclone separator into the vapor phase treatment device. The bottom of the vapor phase treatment device also has a drain port for discharging the dilute formaldehyde solution obtained by mixing.

[0008] Furthermore, the formaldehyde concentration component further includes a concentrated formaldehyde buffer tank, which is arranged in the formaldehyde concentration flow path between the cyclone separator and the second communication position.

[0009] Furthermore, the formaldehyde concentration system further includes a first delivery pump, which is arranged on the formaldehyde concentration flow path between the concentrated formaldehyde buffer tank and the second communication position.

[0010] Furthermore, the formaldehyde concentration system further includes a concentrated formaldehyde distribution head provided at the outlet side end portion of the formaldehyde concentration flow path.

[0011] Furthermore, the cleaning liquid is a dilute alkaline solution.

[0012] Furthermore, the formaldehyde concentration system also includes a washing liquid storage tank for storing dilute alkali solution, the liquid inlet flow path is connected to the bottom of the washing liquid storage tank, and the top of the washing liquid storage tank is provided with a filling port.

[0013] Furthermore, one end of the drainage channel away from the second communication position is communicated with the top of the washing liquid storage tank.

[0014] Furthermore, the formaldehyde concentration system further includes a second delivery pump, which is arranged on the liquid inlet flow path.

[0015] By applying the technical solution of the present utility model, a formaldehyde concentration system is provided. The formaldehyde concentration system has a formaldehyde concentration flow path and a cleaning flow path. The formaldehyde concentration system includes a formaldehyde concentration component arranged on the formaldehyde concentration flow path. The formaldehyde concentration component is used to concentrate the formaldehyde solution flowing from the inlet side of the formaldehyde concentration flow path to the outlet side of the formaldehyde concentration flow path. The cleaning flow path fills the formaldehyde concentration flow path and the formaldehyde concentration component with cleaning liquid to clean the polyformaldehyde therein. The cleaning flow path includes an inlet flow path and a discharge flow path. The inlet flow path is connectable and disconnectable to the inlet side of the formaldehyde concentration flow path to form a first connection position. The discharge flow path is connectable and disconnectable to the outlet side of the formaldehyde concentration flow path to form a second connection position. The formaldehyde concentration component is located between the first connection position and the second connection position.

[0016] This solution, by providing a cleaning flow path, flushes and cleans polymers within the formaldehyde concentration flow path, preventing polymers generated during the concentration process from being retained in the formaldehyde concentration flow path and affecting the concentration effect and overall yield. This ensures the continuity and efficiency of the formaldehyde concentration process. Furthermore, by confining the formaldehyde concentration component between the first connection position and the second connection position, the cleaning liquid is able to reliably clean the formaldehyde concentration component, ensuring the cleaning effect. Furthermore, this solution can quickly switch to a cleaning mode when necessary. To clean the paraformaldehyde within the formaldehyde concentration flow path, this solution simply stops the formaldehyde concentration component and introduces cleaning liquid from the liquid inlet flow path. The cleaning liquid then flows through the formaldehyde concentration flow path and the formaldehyde concentration component, cleaning the interior thereof. Finally, the cleaned cleaning liquid containing polymers is discharged from the liquid discharge flow path. Compared with the existing technology that requires operators to assist in stopping, disassembling and cleaning the formaldehyde concentration system in sections, this cleaning method reduces the labor intensity of the operators and uses a small amount of cleaning fluid for flushing and replacement. Furthermore, the flow path is closed during the cleaning process, avoiding safety hazards such as gas leakage when disassembling and cleaning the formaldehyde concentration device, and can ensure the thorough cleaning of polymers in some dead zones and elbows of the pipeline, thereby improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 The figure shows a structural diagram of a formaldehyde concentration system provided in an embodiment of the present utility model.

[0019] The above drawings include the following reference numerals:

[0020] 101, formaldehyde concentration flow path; 102, cleaning flow path; 1021, liquid inlet flow path; 1022, liquid discharge flow path; 1031, first connection position; 1032, second connection position;

[0021] 20. Formaldehyde concentration component; 21. Formaldehyde concentrate heater; 211. Steam inlet; 22. Cyclone separator; 23. Formaldehyde concentrate buffer tank;

[0022] 30. Vapor phase treatment device; 301. Liquid discharge port; 302. Water inlet;

[0023] 41. First delivery pump; 42. Second delivery pump;

[0024] 50. Washing liquid storage tank; 501. Filling port;

[0025] 60. Concentrated aldehyde distribution head. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way serves as any limitation on the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0027] like Figure 1 As shown, an embodiment of the present invention provides a formaldehyde concentration system, which has a formaldehyde concentration flow path 101 and a cleaning flow path 102. The formaldehyde concentration system includes a formaldehyde concentration component 20 arranged on the formaldehyde concentration flow path 101. The formaldehyde concentration component 20 is used to concentrate the formaldehyde solution flowing from the inlet side of the formaldehyde concentration flow path 101 to the outlet side of the formaldehyde concentration flow path 101. The cleaning flow path 102 is used to fill the formaldehyde concentration flow path 101 and the formaldehyde concentration component 20 with clean water. The washing liquid is used to clean the paraformaldehyde inside it. The cleaning flow path 102 includes an inlet flow path 1021 and a discharge flow path 1022. The inlet flow path 1021 can be connected to the inlet side of the formaldehyde concentration flow path 101 in a disconnectable manner to form a first connection position 1031. The discharge flow path 1022 can be connected to the outlet side of the formaldehyde concentration flow path 101 in a disconnectable manner to form a second connection position 1032. The formaldehyde concentration component 20 is located between the first connection position 1031 and the second connection position 1032.

[0028] In the embodiment, the cleaning flow path 102 is arranged to clean the polyoxymethylene in the formaldehyde concentration flow path, so as to avoid the problem that the polyoxymethylene generated in the concentration process is retained in the formaldehyde concentration flow path and affects the concentration effect and the overall yield, thereby ensuring the continuity and efficiency of the formaldehyde concentration process. By limiting the formaldehyde concentration assembly 20 between the first communication position 1031 and the second communication position 1032, the reliability of the cleaning liquid to clean the formaldehyde concentration assembly 20 is ensured, and the cleaning effect is ensured. On the other hand, the embodiment can quickly switch to the cleaning mode when needed. When the polyoxymethylene in the formaldehyde concentration flow path needs to be cleaned, the operation of the formaldehyde concentration assembly 20 is stopped, and the cleaning liquid is filled from the liquid inlet flow path 1021. The cleaning liquid flows through the formaldehyde concentration flow path and the formaldehyde concentration assembly 20 and cleans the inside of the formaldehyde concentration assembly 20. Finally, the cleaning liquid with polyoxymethylene after cleaning is discharged from the liquid outlet flow path 1022. Compared with the operation of stopping and disassembling the formaldehyde concentration system and segmental cleaning by the operator in the prior art, the labor intensity of the operator is reduced, and the amount of cleaning liquid for flushing and replacement is small. Further, the flow path is closed during the cleaning process, avoiding the safety hazard of gas escaping when the formaldehyde concentration device is disassembled and cleaned, and ensuring the thorough cleaning of the polyoxymethylene in the pipeline dead zone and elbow part, thereby improving the cleaning effect.

[0029] In the embodiment, the cleaning liquid is a dilute alkali solution. According to the principle that polyoxymethylene can be saccharified with alkali, the polyoxymethylene that is difficult to remove in the formaldehyde concentration flow path and the formaldehyde concentration assembly of the formaldehyde concentration system is saccharified and taken out of the formaldehyde concentration system, so that the formaldehyde concentration system reaches the standby condition after cleaning. In this way, the polyoxymethylene is neutralized and dissolved by the dilute alkali solution, which not only improves the cleaning effect of the equipment, but also effectively protects the metal surface of the equipment, avoiding the corrosion problem of the equipment when strong acid or strong alkali is used as the cleaning liquid, thereby reducing the cost of equipment maintenance and replacement on the basis of ensuring the cleaning effect of the polyoxymethylene.

[0030] As shown in Figure 1 The formaldehyde concentration system further includes a washing liquid storage tank 50 for storing the dilute alkali solution. The liquid inlet flow path 1021 is in communication with the bottom of the washing liquid storage tank 50, and the top of the washing liquid storage tank 50 has a filling port 501.

[0031] In the embodiment, the washing liquid storage tank 50 is used to facilitate the preparation and storage of the dilute alkali solution. The top of the washing liquid storage tank 50 has two filling ports 501, one of which is used to add 48% sodium hydroxide, and the other is used to add desalted water, so as to prepare a sufficient amount of sodium hydroxide solution with a concentration of about 3% to 48% (the concentration is adjusted according to the actual situation) in the washing liquid storage tank 50.

[0032] As shown in Figure 1As shown, one end of the drainage channel 1022 away from the second connection position 1032 is connected to the top of the washing liquid storage tank 50. This arrangement allows the dilute alkali solution discharged by the drainage channel 1022 to be returned to the washing liquid storage tank 50 for recycling or recycling, which not only reduces the discharge of wastewater and avoids the environmental pollution problems that may be caused by direct discharge, but also allows the useful components in the dilute alkali solution to be recycled and reused, further reducing the amount of water required for flushing and replacement of cleaning liquid. Specifically, the concentration of sodium hydroxide in the recovered dilute alkali solution is reduced and the sodium hydroxide concentration in the washing liquid storage tank 50 is reduced. The operator can add 48% sodium hydroxide and desalted water to the washing liquid storage tank 50 according to actual conditions to maintain the solubility of the sodium hydroxide solution in the washing liquid storage tank 50 at 3% to 48% (adjusting the concentration according to actual conditions). This reduces the configuration cost compared to discharging the dilute alkali solution that has been cleaned and re-configuring the dilute alkali solution in the washing liquid storage tank 50.

[0033] like Figure 1 As shown, the formaldehyde concentration component 20 includes a refined formaldehyde heater 21 and a cyclone separator 22. In the direction from the inlet side of the formaldehyde concentration flow path 101 to the outlet side of the formaldehyde concentration flow path 101, the refined formaldehyde heater 21 and the cyclone separator 22 are sequentially arranged on the formaldehyde concentration flow path 101 between the first connecting position 1031 and the second connecting position 1032. The upper side of the refined formaldehyde heater 21 has a steam inlet 211 for charging heating steam into the interior of the refined formaldehyde heater 21. The cyclone separator 22 is used to separate the concentrated formaldehyde solution from the vapor phase discharged from the refined formaldehyde heater 21.

[0034] In this embodiment, the refined formaldehyde heater 21 is primarily used to heat the formaldehyde solution, causing it to boil and rapidly vaporize. During this process, the formaldehyde solution is heated by the heating steam, generating formaldehyde vapor. This vapor rapidly rises, driving the formaldehyde solution to form a film-like upward motion along the tube wall, thereby achieving formaldehyde evaporation and concentration. The cyclone separator 22 primarily utilizes the centrifugal force generated by high-speed rotation to separate the liquid phase (concentrated formaldehyde solution) and the solid phase from the vapor phase. The combination of distillation and cyclonic separation technologies not only improves the concentration efficiency of the formaldehyde solution but also effectively separates impurities generated during the concentration process, ensuring the purity of the final product.

[0035] It is understandable that a drain pipe connected to the washing liquid storage tank 50 can also be set at the bottom of the refined aldehyde heater 21 to facilitate the recovery of the cleaning liquid accumulated in the refined aldehyde heater 21 to the washing liquid storage tank 50 to avoid affecting the normal operation of the refined aldehyde heater 21.

[0036] It should be noted that the products obtained by saccharification of dilute alkali liquid and polyformaldehyde are mostly liquid and colloidal. When cleaning the refined aldehyde heater 21, the steam inlet 211 and the drain pipe above it can be closed. The dilute alkali liquid gradually fills the refined aldehyde heater 21 and flows from its top to the cyclone separator 22 and the subsequent flow path. The dilute alkali liquid will eventually be discharged from the drainage path 1022 to the washing liquid storage tank 50 with the liquid or colloidal products obtained by saccharification. After completing the cleaning of the formaldehyde concentration flow path 101 and other formaldehyde concentration components 20 behind the refined aldehyde heater 21, open the drain pipe at the bottom of the refined aldehyde heater 21 to discharge the dilute alkali liquid in the refined aldehyde heater 21 and the liquid and colloidal products obtained by saccharification back to the washing liquid storage tank 50, completing the cleaning of the formaldehyde concentration flow path 101 and the formaldehyde concentration component 20.

[0037] Specifically, the formaldehyde concentration system also includes a vapor phase treatment device 30 connected to the vapor phase outlet above the cyclone separator 22. The vapor phase treatment device 30 has a water inlet 302 for charging the vapor phase treatment device 30 with circulating water mixed with the vapor phase discharged from the cyclone separator 22. The vapor phase treatment device 30 also has a drain port 301 at its bottom for discharging the resulting dilute formaldehyde solution. This arrangement not only further recovers the product during the formaldehyde concentration process, but also reduces the amount of dilute formaldehyde recovered and steam consumption by the cyclone separator 22, thereby improving the concentration and separation efficiency.

[0038] Furthermore, the formaldehyde concentration component 20 further includes a concentrated formaldehyde buffer tank 23 , which is disposed on the formaldehyde concentration flow path 101 between the cyclone separator 22 and the second communication position 1032 .

[0039] During the formaldehyde concentration process, the concentrated formaldehyde buffer tank 23 is used to store the concentrated formaldehyde solution after the concentration process. This prevents the concentrated formaldehyde solution from being directly output to the production line or storage container due to inability to store it. This helps ensure the stability of the storage and distribution of the concentrated formaldehyde solution required for subsequent processes. Furthermore, the concentrated formaldehyde buffer tank 23 can effectively cope with fluctuations in the production process, providing a certain degree of voltage and flow stabilization.

[0040] like Figure 1 As shown, the formaldehyde concentration system further includes a first delivery pump 41, which is disposed in the formaldehyde concentration flow path 101 between the concentrated formaldehyde buffer tank 23 and the second connection point 1032. This arrangement ensures the fluidity of the fluid within the formaldehyde concentration flow path 101, allowing for smooth forward transport of the fluid. Preferably, the pumping efficiency of the first delivery pump 41 is adjustable, allowing the flow rate of the fluid to be adjusted based on actual conditions to ensure both concentration and cleaning efficiency.

[0041] Specifically, the formaldehyde concentration system further includes a concentrated formaldehyde distribution head 60 disposed at the outlet end of the formaldehyde concentration flow path 101. This arrangement allows the concentrated formaldehyde to be evenly distributed to different production lines or storage containers according to actual needs, thereby improving the applicability of the formaldehyde concentration system and the flexibility and accuracy of distribution.

[0042] Furthermore, the formaldehyde concentration system includes a second delivery pump 42, which is disposed on the liquid inlet path 1021. This arrangement allows the second delivery pump 42 to pump cleaning liquid from the cleaning liquid storage tank 50 to the inlet side of the formaldehyde concentration path 101, ensuring reliable and stable cleaning of the formaldehyde concentration path 101 and the formaldehyde concentration assembly 20. Preferably, the pumping efficiency of the second delivery pump 42 is adjustable to ensure that the cleaning liquid enters the formaldehyde concentration path 101 and the formaldehyde concentration assembly 20 at sufficient pressure. This facilitates more thorough removal of residual paraformaldehyde within the equipment, improves cleaning efficiency and cleanliness, and thereby reduces production failure rates and maintenance costs.

[0043] In summary, the present invention provides a formaldehyde concentration system, which includes a formaldehyde concentration state and a cleaning state. When it is in the formaldehyde concentration state, the connection between the liquid inlet flow path 1021, the liquid discharge flow path 1022 and the formaldehyde concentration flow path 101 is disconnected, and the inlet side of the formaldehyde concentration flow path 101 is filled with 40% to 45% formaldehyde solution. The formaldehyde solution flows through the refined aldehyde heater 21 and the cyclone separator 22 in sequence to obtain concentrated formaldehyde liquid and dilute formaldehyde liquid. The concentrated formaldehyde liquid flows into the concentrated formaldehyde buffer tank 23 for storage and is distributed by the concentrated formaldehyde distribution head 60. Among them, heating steam is added to the refined aldehyde heater 21 through the steam inlet 211 to achieve evaporation and concentration of the formaldehyde liquid. The fluidity and efficiency of the formaldehyde liquid along the formaldehyde concentration flow path 101 are guaranteed by the first delivery pump 41. During the formaldehyde concentration process, paraformaldehyde is easily produced. In order to prevent it from clogging the flow path, the formaldehyde concentration system can be switched to a cleaning state. In this state, the inlet flow path 1021, the discharge flow path 1022 and the formaldehyde concentration flow path 101 are all connected. The second delivery pump 42 pumps the dilute alkali liquid in the washing liquid storage tank 50 into the formaldehyde concentration flow path 101 from the inlet side of the formaldehyde concentration flow path 101. The dilute alkali liquid flows through the refined aldehyde heater 21, the cyclone separator 22, and the concentrated aldehyde buffer tank 23 in sequence and returns to the washing liquid storage tank 50 from the discharge flow path 1022. The dilute alkali liquid is used to clean the paraformaldehyde, preventing it from being retained and accumulated in the formaldehyde concentration flow path 101 and the formaldehyde concentration component 20. With this arrangement, there is no need to manually dismantle the pipeline equipment of the formaldehyde concentration system for cleaning as in the prior art, which reduces the labor intensity of employees. The cleaning flow path and the formaldehyde concentration flow path 101 are closed flow paths. During the cleaning process, the dilute alkali liquid can effectively fill the cleaning flow path, the formaldehyde concentration flow path 101 and the formaldehyde concentration component 20, and can thoroughly clean the polymers inside the dead zone, pipeline elbows, etc., avoiding the atmospheric emission of toxic and harmful media generated when the pipeline is dismantled, providing convenience for VOCs control. At the same time, the recycling of the dilute alkali liquid can save the amount of flushing and replacement water in the water washing process, and does not need to be directly discharged, reducing the load on the wastewater recovery system.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0046] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A formaldehyde concentration system, characterized in that: The formaldehyde concentration system comprises a formaldehyde concentration flow path (101) and a cleaning flow path (102). The formaldehyde concentration system comprises a formaldehyde concentration component (20) arranged on the formaldehyde concentration flow path (101). The formaldehyde concentration component (20) is used to concentrate the formaldehyde solution flowing from the inlet side of the formaldehyde concentration flow path (101) to the outlet side of the formaldehyde concentration flow path (101). The cleaning flow path (102) is used to fill the formaldehyde concentration flow path (101) and the formaldehyde concentration component (20) with a cleaning liquid to clean the polyformaldehyde therein. The cleaning flow path (102) includes a liquid inlet flow path (1021) and a liquid discharge flow path (1022); the liquid inlet flow path (1021) is connectable and disconnectable to the inlet side of the formaldehyde concentration flow path (101) to form a first connection position (1031); the liquid discharge flow path (1022) is connectable and disconnectable to the outlet side of the formaldehyde concentration flow path (101) to form a second connection position (1032); the formaldehyde concentration component (20) is located between the first connection position (1031) and the second connection position (1032).

2. The formaldehyde concentration system according to claim 1, characterized in that: The formaldehyde concentration component (20) comprises a refined formaldehyde heater (21) and a cyclone separator (22). The refined formaldehyde heater (21) and the cyclone separator (22) are sequentially arranged on the formaldehyde concentration flow path (101) between the first connecting position (1031) and the second connecting position (1032) in a direction from the inlet side of the formaldehyde concentration flow path (101) toward the outlet side of the formaldehyde concentration flow path (101). The upper side of the refined formaldehyde heater (21) has a steam inlet (211) for charging heating steam into the interior of the refined formaldehyde heater (21). The cyclone separator (22) is used to separate concentrated formaldehyde solution from the vapor phase portion discharged from the refined formaldehyde heater (21).

3. The formaldehyde concentration system according to claim 2, characterized in that: The formaldehyde concentration system further comprises a vapor phase treatment device (30) connected to the vapor phase outlet above the cyclone separator (22), the vapor phase treatment device (30) having a water inlet (302) for charging the vapor phase treatment device (30) with circulating water mixed with the vapor phase discharged from the cyclone separator (22), and a liquid discharge port (301) at the bottom of the vapor phase treatment device (30) for discharging the mixed dilute formaldehyde solution.

4. The formaldehyde concentration system according to claim 2, characterized in that: The formaldehyde concentration component (20) further comprises a concentrated formaldehyde buffer tank (23), and the concentrated formaldehyde buffer tank (23) is arranged on the formaldehyde concentration flow path (101) between the cyclone separator (22) and the second communication position (1032).

5. The formaldehyde concentration system according to claim 4, characterized in that: The formaldehyde concentration system further comprises a first delivery pump (41), which is arranged on the formaldehyde concentration flow path (101) between the concentrated formaldehyde buffer tank (23) and the second communication position (1032).

6. The formaldehyde concentration system according to claim 1, characterized in that: The formaldehyde concentration system further includes a concentrated formaldehyde distribution head (60) provided at the outlet end of the formaldehyde concentration flow path (101).

7. The formaldehyde concentration system according to claim 1, characterized in that: The cleaning solution is a dilute alkali solution.

8. The formaldehyde concentration system according to claim 7, characterized in that: The formaldehyde concentration system further comprises a washing liquid storage tank (50) for storing the dilute alkali solution, the liquid inlet flow path (1021) is connected to the bottom of the washing liquid storage tank (50), and the top of the washing liquid storage tank (50) has a filling port (501).

9. The formaldehyde concentration system according to claim 8, characterized in that: One end of the drainage channel (1022) away from the second communication position (1032) is connected to the top of the washing liquid storage tank (50).

10. The formaldehyde concentration system according to claim 1, characterized in that: The formaldehyde concentration system further comprises a second delivery pump (42), and the second delivery pump (42) is arranged on the liquid inlet flow path (1021).

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