Precipitation, filtration and separation device for dilute formaldehyde in paraformaldehyde

Abstract

The utility model discloses a precipitation, filtration and separation device for dilute formaldehyde in paraformaldehyde, and belongs to the technical field of dilute formaldehyde treatment. Comprising a storing and mixing assembly which comprises a precipitant box, a first water pump, a raw material box and a second water pump; the stirring and distributing assembly comprises a stirring box, a first rotating motor, a PLC panel and a third water pump are arranged on the periphery of the stirring box, a first water level sensor is arranged in the stirring box, a stirring rod is arranged at the output end of the first rotating motor, and a heating pipe is arranged in the stirring rod; the precipitation assembly comprises a precipitation tank, a second water level sensor is arranged in the precipitation tank, and a low-position discharging valve and a high-position discharging valve are arranged on the two sides of the precipitation tank. Raw materials and precipitants are simultaneously discharged into the stirring box for stirring and mixing through the water pump, and are discharged into the precipitation box for standing and layering after being mixed. The sedimentation tank is compact and reasonable in structural design, good in sedimentation effect and capable of continuously stirring while sedimentation is carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of dilute formaldehyde treatment, and more specifically, to a precipitation filtration separation device for dilute formaldehyde in paraformaldehyde. Background Technique

[0002] In the paraformaldehyde production process, excess water is evaporated by steam heating to increase the paraformaldehyde content. A large amount of dilute formaldehyde produced in the process is an intermediate product that urgently needs to be treated. In current production, the dilute formaldehyde produced by concentrating formaldehyde in a scraper dryer can be used in formaldehyde production (instead of soft water). However, since the dust generated during the drying process in a rake dryer is also mixed in the dilute formaldehyde produced by the rake dryer, the dilute formaldehyde becomes turbid and cannot be used for formaldehyde recovery. Therefore, it can only be sent to the hexamine workshop to produce hexamine.

[0003] The patent document with the publication number CN207126244U in the prior art provides a precipitation filtration separation device for dilute formaldehyde in paraformaldehyde. The device transports a precipitant and raw materials through the inner wall of an L-shaped feed pipe box, and then drives a stirring shaft and a heating rod inside the stirring shaft to rotate and heat and stir by a motor, so that the raw materials and the precipitant are mixed. Finally, after standing and stratifying, the lower-layer mixture flows out from a second discharge pipe through a filter screen, and the upper-layer formaldehyde flows out from a first discharge pipe.

[0004] Although the device has many beneficial effects, there are still the following problems: during the stirring process of the device, the heating rod in the center of the stirring rod can only heat the center of the solution, making the temperature unable to reach the predetermined value quickly. And when standing, the stirring needs to be stopped, and the stirring work cannot be continued during the standing of the solution, resulting in low efficiency and needing improvement. In view of this, we propose a precipitation filtration separation device for dilute formaldehyde in paraformaldehyde. Content of the Utility Model

[0005] 1. Technical Problems to be Solved

[0006] The purpose of the utility model is to provide a precipitation filtration separation device for dilute formaldehyde in paraformaldehyde to solve the problems of slow heating and inability to work synchronously mentioned in the above background technique.

[0007] 2. Technical Solution

[0008] A precipitation filtration separation device for dilute formaldehyde in paraformaldehyde includes a storage and mixing assembly. The storage and mixing assembly includes a precipitant tank, and a first water pump is arranged on one side of the precipitant tank. The storage and mixing assembly further includes a raw material tank, and a second water pump is arranged on one side of the raw material tank.

[0009] Stirring and dispensing assembly, the stirring and dispensing assembly includes a stirring tank, a first rotary motor is arranged at the top of the stirring tank, a first water level sensor is arranged inside the stirring tank, a PLC panel is arranged on the front of the stirring tank, a third water pump is arranged on the left side of the stirring tank, a stirring rod is arranged below the first rotary motor, and a heating pipe is arranged inside the stirring rod;

[0010] Precipitation assembly, the precipitation assembly includes a precipitation tank, a second water level sensor is arranged inside the precipitation tank, a low-level discharge valve is arranged on the left side of the precipitation tank, and a high-level discharge valve is arranged on the right side.

[0011] The first water level sensor is electrically connected to the PLC panel to control the start and stop of the first water pump and the second water pump, the second water level sensor is electrically connected to the PLC panel to control the start and stop of the third water pump, and the first rotary motor and the heating pipe are separately provided with switches.

[0012] Preferably, a feed pipe is arranged between the precipitant tank and the first water pump, a feed pipe is arranged between the raw material tank and the second water pump, and the first water pump and the second water pump are connected to the stirring tank through the feed pipe.

[0013] Preferably, a plurality of cylinders are arranged around the stirring rod, a cavity structure is arranged inside the stirring rod and the cylinders, and one end of the stirring rod is provided with a thread to be connected to the first rotary motor.

[0014] Preferably, a mixed discharge pipe is arranged between the water inlet of the third water pump and the stirring tank, and a mixed feed pipe is arranged between the water outlet of the third water pump and the precipitation tank.

[0015] Preferably, a filter screen is arranged at the outlet of the low-level discharge valve, the first water level sensor is arranged on the inner wall of the stirring tank, and the second water level sensor is arranged on the inner wall of the precipitation tank.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the advantages of the present utility model are as follows:

[0018] In the present utility model, the raw materials and the precipitant are simultaneously discharged into the stirring tank by the water pump for stirring and mixing. During the mixing process, the solution is heated at multiple ends by adding a plurality of heat pipes. After the mixing is completed, it is discharged into the precipitation tank for static stratification. While static stratifying, the stirring tank can continue to carry out stirring operations. Finally, formaldehyde is discharged through the high-level discharge valve, and the mixture is filtered and discharged through the low-level discharge valve. The structure design of the present utility model is compact and reasonable, and the precipitation effect is good. Stirring work can be continued during precipitation. Description of the drawings

[0019] Figure 1 It is a front view schematic diagram of a precipitation and filtration separation device for dilute formaldehyde in paraformaldehyde of the present utility model;

[0020] Figure 2 This is a top view schematic diagram of a precipitation filtration separation device for dilute formaldehyde in paraformaldehyde of the present utility model;

[0021] Figure 3 This is an overall schematic diagram of a precipitation filtration separation device for dilute formaldehyde in paraformaldehyde of the present utility model;

[0022] Figure 4 This is a schematic diagram of the heating of the stirring rod of a precipitation filtration separation device for dilute formaldehyde in paraformaldehyde of the present utility model.

[0023] 100. Storage and mixing assembly; 101. Precipitant tank; 102. First water pump; 103. Raw material tank; 104. Second water pump; 200. Stirring and distribution assembly; 201. Stirring tank; 202. PLC panel; 203. First rotary motor; 204. Stirring rod; 205. Heating pipe; 206. Mixed discharge pipe; 207. First water level sensor; 208. Third water pump; 209. Mixed feed pipe 300. Precipitation assembly; 301. Precipitation tank; 302. Second water level sensor; 303. Low-level discharge valve; 304. High-level discharge valve; 305. Filter screen. Detailed implementation manners

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0025] In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, terms such as "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] Please refer toFigures 1-4 , the present utility model provides a technical solution:

[0028] A precipitation filtration separation device for dilute formaldehyde in paraformaldehyde, comprising a storage and mixing assembly 100. The storage and mixing assembly 100 includes a precipitant tank 101, and a first water pump 102 is arranged on one side of the precipitant tank 101. The storage and mixing assembly 100 further includes a raw material tank 103, and a second water pump 104 is arranged on one side of the raw material tank 103; the stirring and distribution assembly 200 includes a stirring tank 201, a first rotary motor 203 is arranged on the top of the stirring tank 201, a first water level sensor 207 is arranged inside the stirring tank 201, a PLC panel 202 is arranged on the front of the stirring tank 201, a third water pump 208 is arranged on the left side of the stirring tank 201, a stirring rod 204 is arranged at the output end of the first rotary motor 203, and a heating pipe 205 is arranged inside the stirring rod 204; the precipitation assembly 300 includes a precipitation tank 301, a second water level sensor 302 is arranged inside the precipitation tank 301, a low-level discharge valve 303 is arranged on the left side of the precipitation tank 301. The first water level sensor 207 is electrically connected to the PLC panel 202 to control the start and stop of the first water pump 102 and the second water pump 104. The second water level sensor 302 is electrically connected to the PLC panel 202 to control the start and stop of the third water pump 208. The first rotary motor 203 and the heating pipe 205 are separately provided with switches.

[0029] First, to ensure that the precipitant tank 101 can be connected to the first water pump 102, the raw material tank 103 can be connected to the second water pump 104, and the first water pump 102 and the second water pump 104 can be connected to the stirring tank 201. Specifically, a feed pipe is arranged between the precipitant tank 101 and the first water pump 102, a feed pipe is arranged between the raw material tank 103 and the second water pump 104, and the first water pump 102 and the second water pump 104 are connected to the stirring tank 201 through the feed pipe.

[0030] Next, to ensure that the stirring rod 204 can be fixed on the first rotary motor 203 and the heating pipe 205 can be installed inside the cylinder of the stirring rod 204. Specifically, a plurality of cylinders are arranged on the circumference of the stirring rod 204 through threads, a cavity structure is arranged inside the stirring rod 204 and the cylinders, and one end of the stirring rod 204 is provided with threads for connection with the first rotary motor 203.

[0031] Secondly, to ensure that the stirring tank 201 can be connected to the third water pump 208 and the third water pump 208 can be connected to the precipitation tank 301. Specifically, a mixed discharge pipe 206 is arranged between the water inlet of the third water pump 208 and the stirring tank 201, and a mixed feed pipe 209 is arranged between the water outlet of the third water pump 208 and the precipitation tank 301.

[0032] Finally, in order to ensure that the low-level discharge valve 303 does not discharge sediment residues during discharging, and the first water level sensor 207 and the second water level sensor 302 can be fixed. Specifically, a filter screen 305 is provided at the outlet of the low-level discharge valve 303, the first water level sensor 207 is arranged on the inner wall of the mixing tank 201, and the second water level sensor 302 is arranged on the inner wall of the sedimentation tank 301.

[0033] In addition, the circuits, electronic components, and modules involved in the present utility model are all prior arts, which can be fully realized by those skilled in the art without further elaboration. The content protected by the present utility model does not involve improvements to the internal structure and method either.

[0034] The device or equipment models involved in this article are as follows:

[0035] The first water pump 102: ISG50-160(I)A;

[0036] The second water pump 104: ISG50-160(I)A;

[0037] The third water pump 208: ISG50-160(I)A;

[0038] The first rotary motor 203: Y225M-2;

[0039] The first water level sensor 207: BL-YW-SR-OL-12;

[0040] The second water level sensor 302: BL-YW-SR-OL-12;

[0041] The PLC panel 202: SUP043SPRG1.

[0042] Working principle: When the device is required to perform stirring and sedimentation separation, first fill the materials in the precipitant tank 101 and the raw material tank 103, and start the first water pump 102 and the second water pump 104 through the PLC panel 202 to discharge them into the mixing tank 201 in proportion. When the first water level sensor 207 senses that the solution height reaches the preset value, the first water pump 102 and the second water pump 104 are automatically turned off. Then, start the first rotating motor 203 through the PLC panel 202 to drive the stirring rod 204 to rotate and stir. At the same time, the PLC panel 202 starts multiple heating tubes 205 to perform multi-stage heating on the mixed solution. Secondly, when the precipitant and the raw materials are fully mixed, the PLC panel starts the third water pump 208 to discharge the mixed solution into the sedimentation tank 301. When the second water level sensor 302 senses that the solution height reaches the preset value, the third water pump 208 is automatically turned off. Then, the mixed solution is left to stand and layer in the sedimentation tank 301. While standing and layering, the stirring operation can continue in the mixing tank 201. Finally, after the standing and layering is completed, the upper-layer formaldehyde is discharged through the high-level discharge valve 304, and the lower-layer mixture is filtered and discharged through the low-level discharge valve 303 to complete the separation.

[0043] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A precipitation filtration separation device for dilute formaldehyde in paraformaldehyde, characterized in that: The storage and mixing assembly (100) comprises a precipitant tank (101), a first water pump (102) is arranged on one side of the precipitant tank (101), and the storage and mixing assembly (100) further comprises a raw material tank (103), a second water pump (104) is arranged on one side of the raw material tank (103); A stirring and distributing assembly (200), the stirring and distributing assembly (200) comprising a stirring box (201), a No. 1 rotating motor (203) being arranged on the top of the stirring box (201), a No. 1 water level sensor (207) being arranged inside the stirring box (201), a PLC panel (202) being arranged on the front of the stirring box (201), a No. 3 water pump (208) being arranged on the left side of the stirring box (201), a stirring rod (204) being arranged at the output end of the No. 1 rotating motor (203), and a heating tube (205) being arranged inside the stirring rod (204); A sedimentation assembly (300), the sedimentation assembly (300) comprising a sedimentation box (301), a second water level sensor (302) being arranged inside the sedimentation box (301), a low-level discharge valve (303) being arranged on the left side of the sedimentation box (301), and a high-level discharge valve (304) being arranged on the right side; The first water level sensor (207) is electrically connected to the PLC panel (202) to control the start and stop of the first water pump (102) and the second water pump (104); the second water level sensor (302) is electrically connected to the PLC panel (202) to control the start and stop of the third water pump (208); and the first rotating motor (203) and the heating tube (205) are independently provided with switches.

2. The precipitation, filtration and separation device for dilute formaldehyde in paraformaldehyde according to claim 1, characterized in that: A feed pipe is provided between the precipitant tank (101) and the first water pump (102), a feed pipe is provided between the raw material tank (103) and the second water pump (104), and the first water pump (102) and the second water pump (104) are connected to the stirring tank (201) via the feed pipe.

3. The precipitation, filtration and separation device for dilute formaldehyde in paraformaldehyde according to claim 2, characterized in that: The stirring rod (204) is provided with a plurality of cylinders on its circumference, and a cavity structure is provided inside the stirring rod (204) and the cylinders. One end of the stirring rod (204) is provided with a thread connected to the output end of the first rotating motor (203).

4. The precipitation, filtration and separation device for dilute formaldehyde in paraformaldehyde according to claim 3, characterized in that: A mixing discharge pipe (206) is provided between the water inlet of the third water pump (208) and the mixing tank (201), and a mixing feed pipe (209) is provided between the water outlet of the third water pump (208) and the sedimentation tank (301).

5. The precipitation, filtration and separation device for dilute formaldehyde in paraformaldehyde according to claim 4, characterized in that: A filter screen (305) is provided at the outlet of the low-level discharge valve (303), the first water level sensor (207) is provided on the inner wall of the mixing box (201), and the second water level sensor (302) is provided on the inner wall of the sedimentation box (301).

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