A paraformaldehyde production evaporation concentration device

Abstract

The utility model relates to the technical field of evaporation and concentration devices, in particular to an evaporation and concentration device for producing polyformaldehyde, comprising a rising film evaporation component, a support component is arranged on the side of the rising film evaporation component, a tubular evaporation crystallization component is fixedly connected to the top of the support component, and a collecting component is fixedly connected inside the support component; the utility model performs rising film evaporation on a formaldehyde solution in a heating evaporation chamber by using a first heating steam inlet pipe, and cooperates with a separator to not only discharge secondary steam but also separate formaldehyde concentrated liquid; the main advantages of the rising film evaporation are high heat transfer efficiency, fast evaporation speed, short evaporation time, and high-speed secondary steam has a good foam breaking effect; the heating evaporation tube is used to heat and evaporate the formaldehyde concentrated liquid, so that the formaldehyde concentrated liquid changes from unsaturated to saturated, and the excess precipitated solute is white amorphous polyformaldehyde powder, and this method is highly efficient and energy-saving.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporation concentration devices, in particular to an evaporation concentration device for producing paraformaldehyde. Background Art

[0002] Paraformaldehyde is a white amorphous powder, which is obtained by heating, evaporating, concentrating and then crystallizing a formaldehyde solution. It has a formaldehyde odor and is a linear polymer of formaldehyde. It has no fixed melting point and decomposes when heated. It is soluble in caustic soda and alkali metal carbonate solutions, but insoluble in alcohol and ether. Its highly polymerized form is insoluble in water and can undergo reactions similar to formaldehyde. Evaporation and concentration are essential steps in the preparation of paraformaldehyde.

[0003] Authorization announcement number CN215427344U discloses an evaporation concentration device for the production of paraformaldehyde. The patented technology is provided with a stirring component, and a power component is used to drive the blades and the stirring rod to rotate, so as to stir the solution, avoid uneven heating of the solution, and accelerate the evaporation rate of water in the solution. An air intake component is provided, and a fan is used to pass gas into the shell to bring out water vapor, accelerate the evaporation rate, and the pipeline disperses the gas to increase the contact area between the gas and the solution and accelerate the flow of the solution. However, in this scheme, the formaldehyde solution needs to be evaporated under a high temperature and high pressure environment. The box-type evaporation device is extremely corrosive to it, and the evaporation method is general. It cannot crystallize high-quality white amorphous powder of paraformaldehyde. In addition, it is difficult to keep warm at high temperature during operation, resulting in large heat loss, large power consumption and high operating cost. Therefore, a paraformaldehyde production evaporation concentration device is needed to improve the above problems. Utility Model Content

[0004] In order to solve the problem that the formaldehyde solution needs to be evaporated under a high temperature and high pressure environment in this scheme, the box-type evaporation device is extremely corrosive to it, the evaporation method is general, and high-quality white amorphous powder of polyformaldehyde cannot be crystallized. In addition, it is difficult to keep warm at high temperature during operation, resulting in large heat loss, large power consumption and high operating costs. The purpose of the utility model is to provide a polyformaldehyde production evaporation and concentration device to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A paraformaldehyde production evaporation concentration device comprises a rising film evaporation component, a support component is arranged on the side of the rising film evaporation component, a tubular evaporation crystallization component is fixedly connected to the top of the support component, and a collecting component is fixedly connected inside the support component;

[0007] The rising film evaporation assembly comprises an evaporating kettle, a heating evaporation chamber is arranged inside the evaporating kettle, a formaldehyde solution inlet pipe, a first heating steam inlet pipe and a first condensed water outlet pipe are fixedly connected to the side of the evaporating kettle, a delivery pipe is fixedly connected to the side of the evaporating kettle, a first extraction pump is arranged at the bottom of the delivery pipe, a separator is fixedly connected to the bottom of the delivery pipe, and a concentrated liquid outlet pipe is fixedly connected to the side of the separator;

[0008] The tubular evaporation crystallization component includes a heating evaporation tube, a transport tube is fixedly connected to the side of the heating evaporation tube, a second extraction pump is fixedly connected to the side of the transport tube, a valve is fixedly connected to the side of the second extraction pump, a concentrated liquid inlet pipe is fixedly connected to the side of the valve, the concentrated liquid outlet pipe is fixedly connected to the concentrated liquid inlet pipe, and a crystallization discharge pipe is fixedly connected to the bottom of the heating evaporation tube.

[0009] As a preferred solution of the utility model, a control panel is fixedly connected to the side of the evaporator, a secondary steam exhaust pipe is fixedly connected to the side of the separator, a support rod is fixedly connected to the bottom of the evaporator, and a tank foot is fixedly connected to the bottom of the support rod.

[0010] As a preferred solution of the utility model, a temperature gauge is fixedly connected to the top of the heating evaporator tube, a second heating steam inlet pipe is fixedly connected to the side of the heating evaporator tube, and a second condensate outlet pipe is fixedly connected to the bottom of the heating evaporator tube.

[0011] As a preferred solution of the utility model, a fixing frame is provided on the side of the heating evaporation tube, two fixing frames are provided, and the heating evaporation tube is arranged inside the fixing frames.

[0012] As a preferred solution of the utility model, the collecting assembly includes a collecting box, the top of the collecting box is fixedly connected with a connecting pipe, the top of the connecting pipe is fixedly connected with a third extraction pump, and the third extraction pump is fixedly connected to the crystallization row pipe.

[0013] As a preferred solution of the utility model, a take-out outlet is provided on the side of the collection box, and a base frame is fixedly connected to the bottom of the collection box.

[0014] As a preferred solution of the utility model, the support assembly includes a mounting frame, and the top of the mounting frame is fixedly connected to an electrical box.

[0015] As a preferred solution of the utility model, the bottom of the mounting frame is fixedly connected with a ground foot, and four ground feet are provided.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. In the utility model, the first heating steam inlet pipe is used to perform rising film evaporation on the formaldehyde solution in the heating evaporation chamber, and the separator is used to not only discharge the secondary steam, but also separate the formaldehyde concentrated liquid. The main advantages of rising film evaporation are high heat transfer efficiency, fast evaporation speed, short evaporation time, and high-speed secondary steam has a good foam breaking effect.

[0018] 2. In the utility model, the formaldehyde concentrated liquid is heated and evaporated by using a heating evaporation tube, so that the formaldehyde concentrated liquid changes from unsaturated to saturated, and the excess precipitated solute is white amorphous polyformaldehyde powder. Its high efficiency and energy-saving characteristics enable enterprises to significantly reduce energy consumption and save costs in the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of a rising film evaporation component of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of a tubular evaporation crystallization component of the utility model;

[0022] Figure 4 It is a schematic diagram of the structure of the collection component of the utility model.

[0023] In the figure: 1. rising film evaporation assembly; 101. evaporation kettle; 102. control panel; 103. formaldehyde solution inlet pipe; 104. first heating steam inlet pipe; 105. first condensed water outlet pipe; 106. delivery pipe; 107. first extraction pump; 108. separator; 109. concentrate outlet pipe; 110. secondary steam discharge pipe; 111. support rod; 112. tank foot; 2. support assembly; 201. mounting frame; 202. foot; 203. electric Box; 3, tubular evaporation crystallization component; 301, heating evaporation tube; 302, thermometer; 303, fixing frame; 304, crystallization row pipe; 305, second heating steam inlet pipe; 306, transport pipe; 307, second condensate outlet pipe; 308, second extraction pump; 309, valve; 310, concentrate inlet pipe; 4, collecting component; 401, collecting box; 402, outlet; 403, connecting pipe; 404, third extraction pump; 405, bottom frame. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0025] For examples, see Figure 1-Figure 4 , the utility model provides a technical solution:

[0026] A paraformaldehyde production evaporation concentration device comprises a rising film evaporation component 1, a supporting component 2 is arranged on the side of the rising film evaporation component 1, a tubular evaporation crystallization component 3 is fixedly connected to the top of the supporting component 2, and a collecting component 4 is fixedly connected inside the supporting component 2.

[0027] In this embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the rising film evaporation component 1 includes an evaporating kettle 101, the interior of the evaporating kettle 101 is provided with a heating evaporation chamber, the side of the evaporating kettle 101 is fixedly connected with a formaldehyde solution inlet pipe 103, a first heating steam inlet pipe 104 and a first condensed water outlet pipe 105, the side of the evaporating kettle 101 is fixedly connected with a delivery pipe 106, the bottom of the delivery pipe 106 is provided with a first extraction pump 107, the bottom of the delivery pipe 106 is fixedly connected with a separator 108, the side of the separator 108 is fixedly connected with a concentrated liquid outlet pipe 109, and the tubular evaporation crystallization component 3 includes a heating evaporation tube 301, the side of the heating evaporation tube 301 is fixedly connected with a delivery pipe 306, and the delivery pipe 306 A second extraction pump 308 is fixedly connected to the side of the second extraction pump 308, a valve 309 is fixedly connected to the side of the valve 309, a concentrated liquid inlet pipe 310 is fixedly connected to the concentrated liquid outlet pipe 109 and the concentrated liquid inlet pipe 310 are fixedly connected, a crystallization discharge pipe 304 is fixedly connected to the bottom of the heating evaporation tube 301, the first heating steam inlet pipe 104 is used to perform rising film evaporation on the formaldehyde solution in the heating evaporation chamber, and the separator 108 can not only discharge the secondary steam, but also separate the formaldehyde concentrated liquid. The main advantages of rising film evaporation are high heat transfer efficiency, fast evaporation speed, short evaporation time, and the high-speed secondary steam has a good foam breaking effect.

[0028] Among them, a control panel 102 is fixedly connected to the side of the evaporator 101, a secondary steam exhaust pipe 110 is fixedly connected to the side of the separator 108, a support rod 111 is fixedly connected to the bottom of the evaporator 101, a tank foot 112 is fixedly connected to the bottom of the support rod 111, a thermometer 302 is fixedly connected to the top of the heating evaporation tube 301, a second heating steam inlet pipe 305 is fixedly connected to the side of the heating evaporation tube 301, a second condensed water outlet pipe 307 is fixedly connected to the bottom of the heating evaporation tube 301, a fixing frame 303 is arranged on the side of the heating evaporation tube 301, two fixing frames 303 are arranged, and the heating evaporation tube 301 is arranged inside the fixing frame 303, and the heating evaporation tube 301 is used to heat and evaporate the formaldehyde concentrated solution, so that the formaldehyde concentrated solution changes from unsaturated to saturated, and the excess precipitated solute is white amorphous polyformaldehyde powder. Its high efficiency and energy-saving characteristics enable enterprises to significantly reduce energy consumption and save costs during the production process.

[0029] In this embodiment, Figure 1 and Figure 4 As shown, the collecting component 4 includes a collecting box 401, a connecting pipe 403 is fixedly connected to the top of the collecting box 401, a third extraction pump 404 is fixedly connected to the top of the connecting pipe 403, the third extraction pump 404 is fixedly connected to the crystallization row pipe 304, a removal outlet 402 is opened on the side of the collecting box 401, a base frame 405 is fixedly connected to the bottom of the collecting box 401, the supporting component 2 includes a mounting frame 201, an electrical box 203 is fixedly connected to the top of the mounting frame 201, a foot 202 is fixedly connected to the bottom of the mounting frame 201, four foots 202 are arranged, and the third extraction pump 404 can quickly collect the excess precipitated polyformaldehyde powder to ensure the working efficiency of the equipment and the quality of the polyformaldehyde powder.

[0030] The working process of the utility model is as follows: when the polyformaldehyde production evaporation concentration device designed by the present invention is in operation, the formaldehyde solution is transported from the formaldehyde solution inlet pipe 103 to the heating evaporation chamber in the evaporator 101, and the heating steam is condensed outside the pipe. When the solution is heated and boiled, it is rapidly vaporized, and the secondary steam generated rises at a high speed in the pipe, driving the liquid to flow upward in a film along the inner wall of the pipe. The rising liquid film continues to evaporate due to the heat, so the solution is gradually evaporated and concentrated in the process of rising from the bottom to the top of the evaporator. After the concentrated solution enters the separator 108 and is separated from the secondary steam, the formaldehyde concentrated liquid is discharged from the concentrated liquid outlet pipe 109 into the concentrated liquid inlet pipe 310, and enters the heating evaporation pipe 301 through the transport pipe 306. The formaldehyde concentrated liquid is heated and evaporated by the heating evaporation pipe 301, so that the formaldehyde concentrated liquid changes from unsaturated to saturated. The excess solute precipitated is white amorphous polyformaldehyde powder, which is transported to the collection box 401 for storage.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A paraformaldehyde production evaporation concentration device, comprising a rising film evaporation component (1), characterized in that: A support assembly (2) is provided on the side of the rising film evaporation assembly (1), a tubular evaporation crystallization assembly (3) is fixedly connected to the top of the support assembly (2), and a collection assembly (4) is fixedly connected inside the support assembly (2); The rising film evaporation assembly (1) comprises an evaporating kettle (101), a heating evaporation chamber is arranged inside the evaporating kettle (101), a formaldehyde solution inlet pipe (103), a first heating steam inlet pipe (104) and a first condensed water outlet pipe (105) are fixedly connected to the side of the evaporating kettle (101), a delivery pipe (106) is fixedly connected to the side of the evaporating kettle (101), a first extraction pump (107) is arranged at the bottom of the delivery pipe (106), a separator (108) is fixedly connected to the bottom of the delivery pipe (106), and a concentrated liquid outlet pipe (109) is fixedly connected to the side of the separator (108); The tubular evaporation crystallization component (3) comprises a heating evaporation tube (301), a transport tube (306) is fixedly connected to the side of the heating evaporation tube (301), a second extraction pump (308) is fixedly connected to the side of the transport tube (306), a valve (309) is fixedly connected to the side of the second extraction pump (308), a concentrated liquid inlet pipe (310) is fixedly connected to the side of the valve (309), the concentrated liquid outlet pipe (109) is fixedly connected to the concentrated liquid inlet pipe (310), and a crystallization discharge pipe (304) is fixedly connected to the bottom of the heating evaporation tube (301).

2. A paraformaldehyde production evaporation concentration device according to claim 1, characterized in that: A control panel (102) is fixedly connected to the side of the evaporating kettle (101), a secondary steam exhaust pipe (110) is fixedly connected to the side of the separator (108), a support rod (111) is fixedly connected to the bottom of the evaporating kettle (101), and a tank foot (112) is fixedly connected to the bottom of the support rod (111).

3. The evaporation and concentration device for producing paraformaldehyde according to claim 1, characterized in that: The top of the heating evaporator tube (301) is fixedly connected with a temperature gauge (302), the side of the heating evaporator tube (301) is fixedly connected with a second heating steam inlet tube (305), and the bottom of the heating evaporator tube (301) is fixedly connected with a second condensed water outlet tube (307).

4. The evaporation and concentration device for producing paraformaldehyde according to claim 1, characterized in that: A fixing frame (303) is arranged on the side of the heating evaporation tube (301), two fixing frames (303) are arranged, and the heating evaporation tube (301) is arranged inside the fixing frames (303).

5. The evaporation and concentration device for producing paraformaldehyde according to claim 1, characterized in that: The collecting assembly (4) comprises a collecting box (401), the top of the collecting box (401) is fixedly connected to a connecting pipe (403), the top of the connecting pipe (403) is fixedly connected to a third extraction pump (404), and the third extraction pump (404) is fixedly connected to the crystallization row pipe (304).

6. A paraformaldehyde production evaporation concentration device according to claim 5, characterized in that: A removal outlet (402) is provided on the side of the collection box (401), and a bottom frame (405) is fixedly connected to the bottom of the collection box (401).

7. The evaporation and concentration device for producing paraformaldehyde according to claim 1, characterized in that: The support assembly (2) comprises a mounting frame (201), and an electrical box (203) is fixedly connected to the top of the mounting frame (201).

8. The evaporation and concentration device for producing paraformaldehyde according to claim 7, characterized in that: The bottom of the mounting frame (201) is fixedly connected with a ground foot (202), and four ground feet (202) are provided.

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