阅读说明：本技术 一种利用空气换热管强化盐雾脱水的装置及工作方法 (Device for strengthening salt spray dehydration by using air heat exchange tube and working method ) 是由 张丹 邓才智 贾金睿 郑巨淦 王一笑 袁洋 于 2021-09-01 设计创作，主要内容包括：一种利用空气换热管强化盐雾脱水的装置及工作方法,该装置由脱盐腔体、送风段、盐水喷射部和循环加热回路组成；脱盐腔体包括脱盐腔和集料斗；送风段包括送风机、送风管、送风加热器、转接段和整流栅格；水喷射部包括喷嘴和高压盐水储罐；循环加热回路包括循环泵、空气换热管、循环管路和循环加热器。本发明能利用空气换热管强化盐雾蒸发,使盐雾快速结晶并脱落,实现更快、更高效的盐-水分离。(A device for strengthening salt spray dehydration by using an air heat exchange tube and a working method thereof are disclosed, wherein the device consists of a desalination cavity, an air supply section, a salt water injection part and a circulating heating loop; the desalting cavity comprises a desalting cavity and a collecting hopper; the air supply section comprises an air feeder, an air supply pipe, an air supply heater, a switching section and a rectification grid; the water spraying part comprises a nozzle and a high-pressure brine storage tank; the circulating heating loop comprises a circulating pump, an air heat exchange pipe, a circulating pipeline and a circulating heater. The invention can utilize the air heat exchange tube to strengthen the evaporation of the salt fog, so that the salt fog is quickly crystallized and falls off, and the faster and more efficient salt-water separation is realized.)

1. The utility model provides an utilize device of air heat exchange tube intensive salt fog dehydration which characterized in that: the device consists of a desalting cavity, an air supply section, a brine spraying part and a circulating heating loop; the desalting cavity comprises a desalting cavity (3) and a collecting hopper (4), wherein the desalting cavity (3) is horizontally arranged, and an outlet is exposed to the atmosphere or connected with a post-treatment part; the aggregate bin (4) is connected with the desalting cavity (3) through an opening at the bottom of the desalting cavity (3);

the air supply section comprises an air feeder (10), an air supply pipe (11), an air supply heater (12), a switching section (13) and a rectification grid (5); wherein the outlet of the blower (10) is connected with the inlet of the blast pipe (11); an air supply heater (12) is arranged in the air supply pipe (11), and the outlet of the air supply pipe (11) is connected with the inlet of the switching section (13); the outlet of the switching section (13) is connected with the inlet of the desalting cavity (3), and a rectifying grid (5) is arranged in the tail part of the switching section (13);

the brine spraying part comprises a nozzle (1) and a high-pressure brine storage tank (2), the nozzle (1) is positioned in the desalting cavity (3), is axially arranged and faces downstream, and is connected with the external high-pressure brine storage tank (2) through a flexible pipe penetrating through the wall surface of the desalting cavity (3);

the circulating heating loop comprises a circulating pump (6), an air heat exchange tube (7), a circulating pipeline (8) and a circulating heater (9), wherein the inlet and the outlet of the circulating pump (6) are connected with the circulating pipeline (8); a circulating heater (9) is arranged in the circulating pipeline (8); the air heat exchange pipe (7) is arranged in the desalting cavity (3), is vertical to the axis of the desalting cavity (3) and is positioned at the downstream of the nozzle (1); the two ends of the desalting chamber (3) and the collecting hopper (4) respectively penetrate through the wall surface of the desalting chamber and the collecting hopper and are connected with a circulating pipeline (8) to form a loop.

2. The device for strengthening salt spray dehydration by using the air heat exchange tube as claimed in claim 1, characterized in that: the salt solution used needs to be pre-concentrated to a concentration of 50% to 100% of the concentration of the saturated solution at the working temperature under pressure.

3. The device for strengthening salt spray dehydration by using the air heat exchange tube as claimed in claim 1, characterized in that: the air heat exchange tube (7) is internally provided with a thread-shaped inner rib, and can generate vibration enough to enable salt crystals to fall off when the internal working medium flows through.

4. The device for strengthening salt spray dehydration by using the air heat exchange tube as claimed in claim 1, characterized in that: the number of the nozzles (1) is more than or equal to 1, and atomization spraying is adopted.

5. The device for strengthening salt spray dehydration by using the air heat exchange tube as claimed in claim 1, characterized in that: the number of the air heat exchange tubes (7) is more than or equal to 1.

6. The device for strengthening salt spray dehydration by using the air heat exchange tube as claimed in claim 1, characterized in that: when the salt fog dehydration process is carried out, the air supply heater (12) and the circulating heater (9) are set to required power so as to enable the temperature at the rectification grid (5) and the air heat exchange tube (7) to reach the temperature suitable for the desalination process.

7. The device for strengthening salt spray dehydration by using the air heat exchange tube as claimed in claim 1, characterized in that: the device is operated to remove salt particles from the collection hopper (4) at regular intervals.

8. The method of operating an apparatus for intensifying salt spray dehydration using an air heat exchange tube as recited in any one of claims 1 to 7, wherein: the method comprises the following steps:

step 1, storing the concentrated brine in a high-pressure brine storage tank 2; filling the cyclic heating loop with a working medium for heating;

step 2, starting the blower 10 and the circulating pump 6, and starting the blower heater 12 and the circulating heater 9; when the temperature and flow parameters are stable;

step 3, starting a salt water spraying part according to parameters, and enabling salt mist to be attached to the air heat exchange tube 7, dehydrated, crystallized and grown until falling into the collecting hopper 4 under the vibration of the air heat exchange tube 7;

and 4, collecting products from the collecting hopper 4 at regular time, and finishing all the steps.

Technical Field

The invention relates to the technical field of material processing and material separation, in particular to a device for strengthening salt spray dehydration by using an air heat exchange tube to accelerate desalination and a working method.

Background

The desalination process widely exists in various industrial and agricultural fields such as chemical production, seawater desalination, desalination purification and the like, and the essence is to pursue efficient and rapid separation of solute and solvent.

The desalination method widely used in industry is generally a thermal desalination method, and can be classified into a heat conduction heating method and a convection heating method. The heat conduction heating method is to heat salt mist or salt solution by using a heating surface to evaporate the solvent and separate out solute; however, this method tends to crystallize the heater surface and cause sheeting, thus requiring periodic removal of the product. The convection heating method uses superheated air to exchange heat in a mixed flow with salt mist and absorb the solvent to obtain salt particles. However, since the specific heat of air is small and the thermal conductivity is poor, and the salt spray is also in motion, the process takes a long time and the equipment volume is large.

Disclosure of Invention

In order to overcome the problems in the prior art, the invention aims to provide a device for strengthening salt mist dehydration by using an air heat exchange tube and a working method thereof, and the device can be used for quickly crystallizing and falling salt mist and realizing faster and more efficient desalination.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a device for strengthening salt spray dehydration by using an air heat exchange tube comprises a desalination cavity, an air supply section, a salt water injection part and a circulating heating loop;

the desalting cavity comprises a desalting cavity 3 and a collecting hopper 4, wherein the desalting cavity 3 is horizontally arranged, and an outlet is exposed to the atmosphere or connected with a post-treatment part; the aggregate bin 4 is connected with the desalting chamber 3 through an opening at the bottom of the desalting chamber 3;

the air supply section comprises an air blower 10, an air supply pipe 11, an air supply heater 12, a switching section 13 and a rectification grid 5; wherein the outlet of the blower 10 is connected with the inlet of the blast pipe 11; an air supply heater 12 is arranged in the air supply pipe 11, and the outlet of the air supply pipe 11 is connected with the inlet of the switching section 13; the outlet of the switching section 13 is connected with the inlet of the desalting chamber 3, and the tail part of the switching section 13 is internally provided with a rectification grid 5;

the brine spraying part comprises a nozzle 1 and a high-pressure brine storage tank 2, the nozzle 1 is positioned in the desalting chamber 3, is axially arranged and faces downstream, and is connected with the external high-pressure brine storage tank 2 through a flexible pipe penetrating through the wall surface of the desalting chamber 3;

the circulating heating loop comprises a circulating pump 6, an air heat exchange tube 7, a circulating pipeline 8 and a circulating heater 9, wherein the inlet and the outlet of the circulating pump 6 are connected with the circulating pipeline 8; a circulation heater 9 is arranged in the circulation pipeline 8; the air heat exchange pipe 7 is arranged in the desalting chamber 3, is vertical to the axis of the desalting chamber 3 and is positioned at the downstream of the nozzle 1; the two ends of the desalting chamber 3 and the collecting hopper 4 respectively penetrate through the wall surface of the desalting chamber and the collecting hopper and are connected with a circulating pipeline 8 to form a loop.

The salt solution used needs to be pre-concentrated to a concentration of 50% to 100% of the concentration of the saturated solution at the working temperature under pressure.

The air heat exchange tube 7 is internally provided with a thread-shaped inner rib, and can continuously generate vibration enough to enable salt crystals to fall off when the internal working medium flows through.

The number of the nozzles 1 is more than or equal to 1, and atomization spraying is adopted.

The number of the air heat exchange tubes 7 is more than or equal to 1.

While the salt spray dehydration process is in progress, the blast heater 12 and the circulation heater 9 are set to the required power to bring the temperature at the rectification grid 5 and the air heat exchange tube 7 to a temperature suitable for the desalination process.

The apparatus is operated to remove salt particles from the collection hopper 4 periodically.

When desalting, firstly, storing the concentrated brine in a high-pressure brine storage tank 2; filling the cyclic heating loop with a working medium for heating; starting the blower 10 and the circulating pump 6, and starting the heater 12 and the circulating heater 9; after the parameters such as temperature, flow and the like are stable, starting a saline water injection part; at this moment, the strong salt water mist sprayed out from the nozzle 1 is quickly heated and evaporated when moving to the vicinity of the air heat exchange tube 7, salt crystals are formed and continuously grow until falling off to the material collecting hopper 4 under the vibration action of the air heat exchange tube 7, products are collected from the material collecting hopper 4 at regular time, and efficient and quick salt water separation can be realized.

Compared with the prior art, the invention has the following advantages:

the salt solution is dispersed into salt mist by spraying, so that the specific surface area is increased, and evaporation and crystallization are facilitated. The air heat exchange tube with the threaded inner ribs is used, continuous vibration is generated when a heat exchange working medium flows in, crystallized salt particles can fall off, and hardening caused by continuous growth of crystals on the surface of the heat exchanger is overcome. Compared with the traditional various thermal separation modes, the method can continuously work, improve the product generation rate, reduce the occupied space of equipment and save materials.

Drawings

FIG. 1 is a schematic view of the process of the present invention.

Fig. 2 is a schematic structural diagram of an air heat exchange tube.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in figure 1, the device for strengthening salt spray dehydration by using an air heat exchange tube comprises a desalination cavity, an air supply section, a salt water injection part and a circulating heating loop; the desalting cavity comprises a desalting cavity 3 and a collecting hopper 4, wherein the desalting cavity 3 is horizontally arranged, and an outlet is exposed to the atmosphere or connected with a post-treatment part; the aggregate bin 4 is connected with the desalting chamber 3 through an opening at the bottom of the desalting chamber 3; the air supply section comprises an air blower 10, an air supply pipe 11, an air supply heater 12, a switching section 13 and a rectification grid 5; wherein the outlet of the blower 10 is connected with the inlet of the blast pipe 11; an air supply heater 12 is arranged in the air supply pipe 11, and the outlet of the air supply pipe 11 is connected with the inlet of the switching section 13; the outlet of the switching section 13 is connected with the inlet of the desalting chamber 3, and the tail part of the switching section 13 is internally provided with a rectification grid 5; the brine spraying part comprises a nozzle 1 and a high-pressure brine storage tank 2, the nozzle 1 is positioned in the desalting chamber 3, is axially arranged and faces downstream, and is connected with the external high-pressure brine storage tank 2 through a flexible pipe penetrating through the wall surface of the desalting chamber 3; the circulating heating loop comprises a circulating pump 6, an air heat exchange tube 7, a circulating pipeline 8 and a circulating heater 9, wherein the inlet and the outlet of the circulating pump 6 are connected with the circulating pipeline 8; a circulation heater 9 is arranged in the circulation pipeline 8; the air heat exchange pipe 7 is arranged in the desalting chamber 3, is vertical to the axis of the desalting chamber 3 and is positioned at the downstream of the nozzle 1; the two ends of the desalting chamber 3 and the collecting hopper 4 respectively penetrate through the wall surface of the desalting chamber and the collecting hopper and are connected with a circulating pipeline 8 to form a loop.

As shown in fig. 2, the air heat exchange tube 7 is internally provided with a screw-shaped inner rib capable of continuously generating vibration sufficient to cause the salt crystals to fall off when the internal working fluid flows.

The first embodiment is as follows: rapid dehydration of sodium chloride (NaCl) solution:

(1) the sodium chloride solution was concentrated to a saturated concentration (about 26.4%) at room temperature under normal pressure and stored in a high-pressure brine storage tank 2. The circulation heating circuit is filled with hot water.

(2) The blower 10 was started and the flow rate was set to 1.5m³·s^-1(ii) a The circulation pump 6 is started and the flow rate is set to 1.0m³·s^-1. And starting the air supply heater 12 and the circulating heater 9, and running for 5min to ensure that the temperature of the rectifying grid 5 is kept at 40 ℃ and the temperature of the air heat exchange tube 7 is kept at 90 ℃.

(3) Adding sodium chloride solution at 15 g.s^-1The flow rate of (3) is ejected from the nozzle 1. The salt mist is attached to the air heat exchange tube 7, dehydrated, crystallized and grown until falling into the collecting hopper 4 under the vibration of the air heat exchange tube 7.

(4) Every 1 hour, the collection window of the collection hopper 4 is opened to complete the recovery of the solid salt particles. The salt fog which is not separated can be recycled.

Example two: sodium sulfate (Na)₂SO₄) And (3) rapid dehydration of the solution:

(1) the sodium sulfate solution was concentrated to a saturated concentration (about 32.7%) at 40 ℃ under normal pressure, and stored in a high-pressure brine storage tank 2, maintained at 40 ℃. The circulation heating loop was filled with ethylene glycol.

(2) The blower 10 is started and the flow rate is set to 1.0m³·s^-1(ii) a The circulation pump 6 was started and the flow rate was set to 0.8m³·s^-1. And starting the air supply heater 12 and the circulating heater 9, and running for 5min to ensure that the temperature of the rectification grid 5 is kept at 50 ℃ and the temperature of the air heat exchange tube 7 is kept at 110 ℃.

(3) Sulfuric acid is addedThe aqueous sodium solution was adjusted to 12 g.s^-1The flow rate of (3) is ejected from the nozzle 1. The salt mist is attached to the air heat exchange tube 7, dehydrated, crystallized and grown until falling into the collecting hopper 4 under the vibration of the air heat exchange tube 7.

(4) Every 1 hour, the collection window of the collection hopper 4 is opened to complete the recovery of the solid salt particles. The unseparated salt mist needs to be recycled or subjected to post-treatment.