CN211411017U

CN211411017U - Caustic soda concentration equipment for chlor-alkali production

Info

Publication number: CN211411017U
Application number: CN201922004997.9U
Authority: CN
Inventors: 王波
Original assignee: Hangzhou Jingshi Technology Co ltd
Current assignee: Henan Shenma Chlorine And Alkali Chemical Co ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-09-04
Anticipated expiration: 2029-11-19

Abstract

The utility model relates to the technical field of chlor-alkali industry, in particular to a caustic soda concentration device for chlor-alkali production, which comprises a reflux device arranged outside a shell, wherein the reflux device comprises a main pipeline communicated with an inner cylinder, the main pipeline passes through the top of a top cover and leads to the outside, the end of the main pipeline is divided into a first branch pipe and a second branch pipe, the first branch pipe is communicated with a cavity, and the second branch pipe is provided with a solenoid valve and an alarm; the concentration equipment also comprises a steam pressure sensor arranged in the cavity, and the signal output end of the steam pressure sensor is electrically connected to the electromagnetic valve and the alarm through the controller. The utility model leads the steam generated in the concentration process into the cavity, so that the heat of the steam is utilized for the second time, and simultaneously, the steam in the cavity is more uniform, and the heating to the caustic soda is more uniform; through setting up steam pressure sensor, when the steam pressure in the cavity was too big, can in time report to the police and discharge, avoided the too big steam pressure in the cavity, cause danger.

Description

Caustic soda concentration equipment for chlor-alkali production

Technical Field

The utility model relates to a chlor-alkali industry technical field specifically is a caustic soda concentrator is used in chlor-alkali production.

Background

Industrial preparation of NaOH and Cl by electrolysis of saturated NaCl solution₂And H₂And a series of chemical products are produced by taking the raw materials as raw materials, which is called chlor-alkali industry. Caustic soda, i.e. sodium hydroxide, is required to be heated and evaporated by a sodium hydroxide solution, and a rotary drum type concentration device and a falling film evaporator are adopted in the prior art.

However, most of the steam heat generated by the sodium hydroxide solution in the existing concentration system is recycled externally, and is not used for compensating heat for the concentration equipment, and secondly, when the pressure of the heating steam of the concentration equipment is too high, potential safety hazards exist.

Therefore, the caustic soda concentration equipment for producing the chlor-alkali is provided to well solve the defects.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a caustic soda concentrator is used in chlor-alkali production to solve the problem that proposes in the above-mentioned background art.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

a caustic soda concentration device for producing chlor-alkali comprises a shell, a top cover covering the top of the shell and a stirring device arranged in the shell, wherein the shell comprises an outer cylinder and an inner cylinder arranged in the outer cylinder, a cavity is formed between the outer cylinder and the inner cylinder, and an electric heating wire is arranged in the cavity; a water inlet pipe is arranged on the outer wall of the outer barrel close to the top end, and a water outlet pipe is arranged on the outer wall of the outer barrel close to the bottom end; a discharge pipe is arranged on the outer wall of the inner cylinder close to the bottom end and penetrates through the side wall of the outer cylinder to lead to the outside; the top of the top cover is provided with a feed inlet, the top of the feed inlet is in threaded connection with a sealing cover, the stirring device comprises a motor arranged at the top of the top cover and a stirring shaft connected to the output end of the motor, the outer wall of the stirring shaft is provided with a plurality of stirring blades extending along the length direction of the stirring shaft, the concentration equipment further comprises a backflow device arranged outside the shell, the backflow device comprises a main pipeline communicated with the inner cylinder, the main pipeline penetrates through the top of the top cover to be led to the outside, the tail end of the main pipeline is divided into a first branch pipe and a second branch pipe, the first branch pipe is communicated with the cavity, and the second branch pipe is provided with an electromagnetic valve and; the concentration equipment further comprises a steam pressure sensor arranged in the cavity, and the signal output end of the steam pressure sensor is electrically connected to the electromagnetic valve and the alarm through the controller.

Preferably, one end of the main pipeline, which is positioned in the inner cylinder, is provided with an air suction cover.

Preferably, the main pipeline is provided with a one-way valve, so that the steam is discharged from the inner barrel to the outside.

Preferably, the inner wall of the outer cylinder is provided with an annular convex edge close to the top end, the outer wall of the inner cylinder is provided with the same annular convex edge close to the top end, and the inner cylinder is lapped on the outer cylinder.

Preferably, an annular grid plate is arranged in the cavity, the outer edge of the annular grid plate is fixed with the inner wall of the outer barrel, and the inner edge of the annular grid plate is in contact with the outer wall of the inner barrel.

Compared with the prior art, the utility model provides a caustic soda concentrator is used in chlor-alkali production possesses following beneficial effect:

1. steam generated in the concentration process is introduced into the cavity, so that the heat of the steam is recycled, and meanwhile, the steam in the cavity is more uniform, and the caustic soda is heated more uniformly;

2. through setting up steam pressure sensor, when the steam pressure in the cavity was too big, can in time report to the police and discharge, avoided the too big steam pressure in the cavity, cause danger.

Drawings

Fig. 1 is a schematic view of the internal structure of the present invention;

fig. 2 is a circuit connection block diagram of the steam pressure sensor and the controller according to the present invention;

fig. 3 is a schematic structural diagram of the annular grid plate of the present invention.

In the figure: 10. a housing; 11. an outer cylinder; 111. a water inlet pipe; 112. a drain pipe; 12. an inner barrel; 121. a discharge pipe; 13. a cavity; 20. a top cover; 21. a feed inlet; 30. an electric heating wire; 40. a stirring device; 41. a motor; 42. a stirring shaft; 43. a stirring blade; 50. a reflux device; 51. a main conduit; 52. a first branch pipe; 53. a second branch pipe; 54. a one-way valve; 55. an electromagnetic valve; 56. an alarm; 60. a steam pressure sensor; 70. a controller; 80. and an annular grid plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example (b): referring to fig. 1, the present invention provides a technical solution: a caustic soda concentration device for producing chlor-alkali comprises a shell 10, a top cover 20 covering the top of the shell 10 and a stirring device 40 arranged in the shell 10; the shell 10 comprises an outer cylinder 11 and an inner cylinder 12 arranged in the outer cylinder 11, wherein an annular convex edge is arranged on the inner wall of the outer cylinder 11 close to the top end, the same annular convex edge is arranged on the outer wall of the inner cylinder 12 close to the top end, and the inner cylinder 12 is lapped on the outer cylinder 11; the depth of the outer cylinder 11 is less than that of the inner cylinder 12, a cavity 13 is formed between the outer cylinder 11 and the inner cylinder 12, water which submerges the bottom of the inner cylinder 12 is stored in the cavity 13, an electric heating wire 30 for heating water is arranged in the cavity 13, and the electric heating wire 30 is electrically connected with an external power supply; a water inlet pipe 111 is arranged on the outer wall of the outer barrel 11 close to the top end, and a water outlet pipe 112 is arranged on the outer wall of the outer barrel 11 close to the bottom end; a discharge pipe 121 is arranged on the outer wall of the inner cylinder 12 close to the bottom end, and the discharge pipe 121 penetrates through the side wall of the outer cylinder 11 to lead to the outside; a feed inlet 21 is formed in the top of the top cover 20, the feed inlet 21 is funnel-shaped, and a seal cover is screwed on the top of the feed inlet 21; the stirring device 40 comprises a motor 41 arranged at the top of the top cover 20 and a stirring shaft 42 connected to the output end of the motor 41, the stirring shaft 42 penetrates through the inner wall of the motor 41 and is introduced into the inner barrel 12, and the outer wall of the stirring shaft 42 is provided with a plurality of stirring blades 43 extending along the length direction of the stirring shaft;

the concentration device further comprises a backflow device 50 arranged outside the shell 10, the backflow device 50 comprises a main pipeline 51 communicated with the inner barrel 12, the main pipeline 51 penetrates through the top of the top cover 20 to be led to the outside, the tail end of the main pipeline 51 is divided into a first branch pipe 52 and a second branch pipe 53, the first branch pipe 52 is communicated with the cavity 13, steam exhausted by the second branch pipe 53 can be reused, a one-way valve 54 is arranged on the main pipeline 51, and an electromagnetic valve 55 and an alarm 56 are arranged on the second branch pipe 53; the end of the main duct 51 within the inner barrel 12 is provided with a suction hood.

Referring to fig. 2, the concentration apparatus further includes a steam pressure sensor 60 disposed in the cavity 13, a signal output end of the steam pressure sensor 60 is electrically connected to the solenoid valve 55 and the alarm 56 through a controller 70, the controller 70 includes a threshold value adjusting module and a comparison module, the threshold value adjusting module is used for adjusting the air pressure threshold value, and the comparison module and the threshold value adjusting module are both electrically connected to the steam pressure sensor 60 and are used for receiving the air pressure threshold value and the air pressure signal and performing comparison response; the electromagnetic valve 55 and the alarm 56 are electrically connected with the comparison module, the alarm 56 is used for alarming and reminding the air pressure signal exceeding the preset air pressure threshold, and the electromagnetic valve 55 is started to enable steam to be discharged from the second branch pipe 53, so that the air pressure in the cavity 13 is reduced. The controller 70 can select an STC89C51RC single chip microcomputer as a control core, and is matched with a resistance strain type pressure sensor and an A/D analog-to-digital conversion chip HX711 to realize data acquisition of steam pressure; an external power supply powers the steam pressure sensor 60, the controller 70, the solenoid valve 55 and the alarm 56.

Referring to fig. 1 and 3, an annular grid plate 80 is arranged in the cavity 13, the outer edge of the annular grid plate 80 is fixed to the inner wall of the outer cylinder 11, the inner edge of the annular grid plate 80 is in contact with the outer wall of the inner cylinder 12, water is heated by the electric heating wire 30 until the water is boiled, and water vapor overflows from the meshes of the annular grid plate 80 to exchange heat with the side wall of the inner cylinder 12, so that the caustic soda solution in the inner cylinder 12 is heated.

The working principle is as follows: sodium hydroxide solution is added into the inner cylinder 12 through the feed port 21, and the feed port 21 is sealed, water is added into the cavity 13 through the water inlet pipe 111, and the power supply of the electric heating wire 30 is connected in parallel, so that the water is heated, steam generated by boiling of the water floats upwards, and exchanges heat with the inner cylinder 12, the motor 41 is started to drive the stirring shaft 42 to rotate, the stirring blade 43 stirs the sodium hydroxide solution to be heated evenly, the water in the sodium hydroxide solution generates steam in the gradual heating process and flows into the cavity 13 from the main pipeline 51 through the first branch pipe 52, when the steam pressure sensor 60 senses that the air pressure in the cavity 13 exceeds a set threshold, the controller 70 controls the solenoid valve 55 on the second branch pipe 53 to open, the alarm 56 gives an alarm to remind, and the steam in the cavity 13 and the steam in the inner barrel 12 are discharged from the second branch pipe 53, so that the heat of the steam can be reused outside conveniently; the concentrated caustic soda is discharged from the discharge pipe 121.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A caustic soda concentration device for producing chlor-alkali comprises a shell (10), a top cover (20) covering the top of the shell (10) and a stirring device (40) arranged in the shell (10), wherein the shell (10) comprises an outer cylinder (11) and an inner cylinder (12) arranged in the outer cylinder (11), a cavity (13) is formed between the outer cylinder (11) and the inner cylinder (12), and an electric heating wire (30) is arranged in the cavity (13); a water inlet pipe (111) is arranged on the outer wall of the outer barrel (11) close to the top end, and a water outlet pipe (112) is arranged on the outer wall of the outer barrel (11) close to the bottom end; a discharge pipe (121) is arranged on the outer wall of the inner cylinder (12) close to the bottom end, and the discharge pipe (121) penetrates through the side wall of the outer cylinder (11) and leads to the outside; feed inlet (21) have been seted up at the top of top cap (20), and the top spiro union of feed inlet (21) has the closing cap, agitating unit (40) are including setting up motor (41) at top cap (20) top and connecting (mixing) shaft (42) at motor (41) output, the outer wall of (mixing) shaft (42) is provided with a plurality of stirring vane (43) that extend along its length direction, its characterized in that: the concentration equipment further comprises a backflow device (50) arranged outside the shell (10), wherein the backflow device (50) comprises a main pipeline (51) communicated with the inner barrel (12), the main pipeline (51) penetrates through the top of the top cover (20) to be led to the outside, the tail end of the main pipeline (51) is divided into a first branch pipe (52) and a second branch pipe (53), the first branch pipe (52) is communicated with the cavity (13), and an electromagnetic valve (55) and an alarm (56) are installed on the second branch pipe (53); the concentrator further comprises a steam pressure sensor (60) arranged in the cavity (13), and a signal output end of the steam pressure sensor (60) is electrically connected to the solenoid valve (55) and the alarm (56) through a controller (70).

2. The caustic soda concentration equipment for chlor-alkali production according to claim 1, characterized in that: and one end of the main pipeline (51) positioned in the inner cylinder (12) is provided with an air suction cover.

3. The caustic soda concentration equipment for chlor-alkali production according to claim 1, characterized in that: the main pipeline (51) is provided with a one-way valve (54) which enables the steam to be discharged from the inner drum (12) to the outside.

4. The caustic soda concentration equipment for chlor-alkali production according to claim 1, characterized in that: the inner wall of the outer barrel (11) is provided with an annular convex edge close to the top end, the outer wall of the inner barrel (12) is provided with the same annular convex edge close to the top end, and the inner barrel (12) is lapped on the outer barrel (11).

5. The caustic soda concentration equipment for chlor-alkali production according to claim 1, characterized in that: an annular grid plate (80) is arranged in the cavity (13), the outer edge of the annular grid plate (80) is fixed with the inner wall of the outer barrel (11), and the inner edge of the annular grid plate (80) is in contact with the outer wall of the inner barrel (12).