CN110822604A - Falling film humidifier with built-in heat source and its working method - Google Patents

Abstract

The invention discloses a built-in heat source falling film humidifier and a working method thereof, belonging to the technical field of humidification and dehumidification. The humidifier mainly includes a cylinder, a top plate and a bottom plate, and is characterized in that: the inside of the cylinder is located between the top plate and the bottom plate and is also provided with a distributor, an upper plate and a collector from top to bottom, and between the distributor and the collector There are several heat exchange tubes. When the liquid enters the humidifier, a good liquid film can be formed on the outer wall of the heat exchange tube, and it can effectively exchange heat with the hot fluid in the heat exchange tube. Efficient heat and mass transfer. In the present invention, the heat source is built in to ensure that the heat is fully absorbed by the two-phase fluid, which not only improves the heat exchange efficiency, but also simplifies the equipment space and reduces the energy consumption of the humidification system. The humidifier has a compact and novel structure, high heat exchange efficiency and small pressure drop, which is of great significance for energy saving, emission reduction and industrial upgrading.

Description

Falling film humidifier with built-in heat source and its working method

technical field

The invention relates to the technical field of humidification and dehumidification, in particular to a falling film humidifier with built-in heat source.

Background technique

With the continuous improvement of people's living standards and industrial production levels, environmental regulation has become increasingly important, and air temperature and humidity, as important indicators of the environment, have always attracted much attention. Using a humidifier to regulate air temperature and humidity is a proven way. Patent No. CN201510042152.2 discloses a spray humidifier. Although the humidifier has a small pressure drop and a simplified structure, it has low heat exchange efficiency and poor humidification effect. Subsequently, the patent number CN201611214327.4 discloses a packing humidifier suitable for a seawater evaporation and concentration system. The humidifier has high heat exchange efficiency and large humidification capacity, but at the same time, the pressure drop is also large. In addition, both the spray humidifier and the filler humidifier are powered by external heating, and the equipment covers a large area, requires a high investment, and is complicated to operate.

Under the background of energy conservation and emission reduction, and industrial upgrading, how to improve the heat exchange efficiency of humidifiers, reduce energy consumption, and speed up equipment upgrading is an urgent problem to be solved.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the existing humidifiers, the present invention provides a built-in heat source falling film humidifier, which has a compact and novel structure, high heat exchange efficiency and low pressure, and is a good supplement to industrial upgrading.

A falling film humidifier with built-in heat source mainly includes a cylinder body, the cylinder body has a bottom plate and a top plate, and is characterized in that: a liquid outlet is set in the center of the bottom plate, and a heat source inlet is set in the center of the top plate; the wall surface of the upper part of the cylinder body is from top to bottom The air outlet and several symmetrical liquid inlets are respectively provided; the wall surface of the lower part of the above-mentioned cylinder is respectively provided with several symmetrical air inlets and a single heat source outlet from top to bottom; the inside of the above-mentioned cylinder is located between the top plate and the bottom plate from top to bottom. A distributor, an upper plate and a collector are arranged; the distributor is located between the air outlet and the liquid inlet; the upper plate is located on the upper part of the cylinder and below the liquid inlet; the collector is located between the air inlet and the heat source outlet The upper plate is distributed with a number of nozzles; the distributor and the collector are in a cavity structure; a number of heat exchange tubes are installed between the distributor and the collector, and the heat exchange tubes correspond to the nozzles one-to-one, and the heat exchange tubes pass through the nozzles; The upper top surface of the above-mentioned distributor communicates with the heat source inlet, and the lower bottom surface of the distributor communicates with the top of the heat exchange tube; the upper top surface of the collector communicates with the bottom of the heat exchange tube, and the lower bottom surface of the collector communicates with the heat source outlet; Several air outlets are arranged around the heat exchange tubes on the upper part; several liquid outlet holes are arranged around the heat exchange tubes on the collector; several gas passage pipes are also distributed on the upper plate, and the gas passage pipes correspond to the air outlets on the distributor one by one.

The working method of the heat source built-in falling film humidifier is characterized in that it includes the following working process: first, the hot fluid enters the cavity of the distributor through the heat source inlet on the top plate, and then enters the heat exchange tube uniformly, and after heat exchange The hot fluid is collected into the collector, and finally discharged from the outlet of the heat source; the low-temperature liquid enters between the distributor and the upper plate from the liquid inlet, and is sprayed by the nozzle to form a uniform liquid film on the outer wall of the heat exchange tube. , fully exchange heat with the hot fluid in the heat exchange tube, the temperature rises continuously, and finally collects on the upper surface of the collector, enters the bottom of the cylinder through the liquid outlet, and finally discharges the cylinder through the liquid outlet on the bottom plate; low temperature and low humidity The air enters between the tube bundles composed of several heat exchange tubes through the air inlet at the bottom of the cylinder. In the process of air rising, through heat and mass transfer with the liquid film, the temperature and humidity continue to increase, and finally the air with high temperature and high humidity First enter the gas channel pipe on the upper plate, and then collect into the head space of the cylinder through the air outlet on the distributor, and finally discharge through the air outlet.

The aforementioned falling film humidifier with built-in heat source is characterized in that: the upper plate is in the form of a disc; The liquid two phases are in uniform contact.

The said one type of built-in heat source falling film humidifier is characterized in that: the liquid will form a certain liquid height between the distributor and the upper plate, in order to prevent the liquid from the liquid inlet outlet and the liquid on the upper plate from blocking the steam The upper part of the gas channel pipe is required to protrude from the upper plate, but lower than the distributor.

The said one type of built-in heat source falling film humidifier is characterized in that: since the liquid entering the cylinder body needs to be sprayed from the nozzles evenly distributed on the upper plate to the heat-conducting wires to form a good liquid film, the nozzles are tapered nozzles.

The said one type of built-in heat source falling film humidifier is characterized in that: the gas channel pipes are evenly distributed in a circle, and the radial angle formed by the liquid inlet on the horizontal section is 30-45°, so that the Prevents liquid from entering the gas channel tube and blocking the gas.

The said one heat source built-in falling film humidifier is characterized in that: in order to make the air have sufficient heat exchange area and flow space between the tube bundles, the distance between the heat exchange tubes is required to be 2-4 times the diameter.

The said one type of built-in heat source falling film humidifier is characterized in that: the liquid outlet hole adopts a circular structure and is evenly distributed in a circle, so as to reduce the resistance and make the liquid collected from the outer wall of the heat exchange tube can be evenly distributed. discharge.

The beneficial effects of the present invention are as follows: the present invention discloses a built-in heat source falling film humidifier, which has a simple and compact structure, high heat exchange efficiency, low pressure drop, and simplified manufacturing process. When the liquid enters the humidifier, a good liquid film can be formed on the outer wall of the heat exchange tube, and it can effectively exchange heat with the hot fluid in the heat exchange tube. As the gravity drops, its temperature continues to rise, so it can conduct efficient heat transfer with the air. quality while reducing flow resistance. Humidification with built-in heat source can ensure that the heat is fully absorbed by the two-phase fluid, which not only improves the heat exchange efficiency, but also simplifies the equipment space and reduces the energy consumption of the humidification system, which is of great significance for energy conservation, emission reduction and industrial upgrading.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the proposed built-in heat source falling film humidifier;

Figure 2 is a front view of the proposed built-in heat source falling film humidifier;

3 is a top view of the proposed built-in heat source falling film humidifier;

Fig. 4 is a partial enlarged view of the upper part of the humidifier;

Fig. 5 is a partial enlarged view of the lower part of the humidifier.

Label name in the figure: 1-cylinder; 2-distributor; 3-liquid inlet; 4-upper plate; 5-heat exchange tube; 6-air inlet; 7-liquid outlet; 8-collector; 9 - Liquid outlet; 10 - Bottom plate; 11 - Heat source outlet; 12 - Nozzle; 13 - Gas channel pipe; 14 - Air outlet; 15 - Air outlet; 16 - Top plate; 17 - Heat source inlet

Specific implementation method

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with accompanying drawings 1 , 2 , 3 , 4 and 5 .

The specific implementation method of the present invention is as follows: first, the hot fluid enters the cavity of the distributor 2 through the heat source inlet 17 on the top plate 16, and then enters the heat exchange tube 5 uniformly, and the hot fluid after heat exchange is collected into the collector 8, Finally, it is discharged from the heat source outlet 11 .

The low-temperature liquid enters between the distributor 2 and the upper plate 4 from the liquid inlet 3, and is sprayed on the outer wall of the heat exchange tube 5 through the nozzle 12 to form a uniform liquid film. The heat and temperature rise continuously, and finally collected on the upper surface of the collector 8 , enter the bottom of the cylinder 1 through the liquid outlet 7 , and finally discharge the cylinder 1 through the liquid outlet 9 on the bottom plate 10 .

The air with low temperature and low humidity enters between the tube bundles composed of several heat exchange tubes 5 through the air inlet 6 at the bottom of the cylinder 1. During the process of air rising, the temperature and humidity continue to increase through heat and mass transfer with the liquid film. Finally, the high-temperature and high-humidity air first enters the gas channel pipe 13 on the upper plate 4 , and then collects into the head space of the cylinder 1 through the air outlet 14 on the distributor 2 , and is finally discharged through the air outlet 15 .

It is particularly noted that the equivalent scaling of the structure of the present invention is also within the scope of protection of the present invention, and when implementing the falling film humidifier with built-in heat source proposed by the present invention, special attention should be paid to the nozzle flow rate and flow rate to ensure that the film is formed. At the same time, the gas flow rate is adjusted according to the liquid film flow rate, so as to achieve high-efficiency humidification.

Claims (8)

1. A falling film humidifier with a built-in heat source mainly comprises a cylinder body (1), wherein the cylinder body (1) is provided with a bottom plate (10) and a top plate (16), and is characterized in that:

a liquid outlet (9) is arranged at the center of the bottom plate (10), and a heat source inlet (17) is arranged at the center of the top plate (16);

the wall surface of the upper part of the cylinder body (1) is respectively provided with an air outlet (15) and a plurality of symmetrical liquid inlets (3) from top to bottom;

the wall surface of the lower part of the cylinder body (1) is respectively provided with a plurality of symmetrical air inlets (6) and a single heat source outlet (11) from top to bottom;

the distributor (2), the upper plate (4) and the collector (8) are sequentially arranged between the top plate (16) and the bottom plate (10) from top to bottom in the cylinder body (1); wherein the distributor (2) is positioned between the air outlet (15) and the liquid inlet (3); wherein the upper plate (4) is positioned at the upper part of the cylinder body (1) and below the liquid inlet (3); wherein the collector (8) is located between the air inlet (6) and the heat source outlet (11);

the upper plate (4) is distributed with a plurality of nozzles (12); the distributor (2) and the collector (8) are in a cavity structure; a plurality of heat exchange tubes (5) are arranged between the distributor (2) and the collector (8), the heat exchange tubes (5) correspond to the nozzles one by one, and the heat exchange tubes (5) penetrate through the nozzles (12);

the upper top surface of the distributor (2) is communicated with a heat source inlet (17), and the lower bottom surface of the distributor (2) is communicated with the upper part of the heat exchange tube (5); the upper top surface of the collector (8) is communicated with the lower part of the heat exchange tube (5), and the lower bottom surface of the collector (8) is communicated with the heat source outlet (11); wherein a plurality of air outlet holes (14) are arranged on the distributor (2) around the heat exchange tube (5); a plurality of liquid outlet holes (7) are formed in the collector (8) and positioned around the heat exchange tube (5);

the upper plate (4) is also distributed with a plurality of gas channel pipes (13), and the gas channel pipes (13) are in one-to-one correspondence with the gas outlet holes (14) on the distributor (2).

2. A heat source built-in falling film humidifier according to claim 1, wherein:

the upper plate (4) is of a disc structure;

the nozzles (12) are uniformly distributed in a ring shape, or uniformly distributed in a square shape, or uniformly distributed in a triangular shape.

3. A heat source built-in falling film humidifier according to claim 1, wherein:

the nozzle (12) is a convergent nozzle.

4. A heat source built-in falling film humidifier according to claim 1, wherein:

the gas channel pipes (13) are uniformly distributed in a circular shape, and the radial included angle formed between the gas channel pipes and the liquid inlet (3) on the horizontal section is 30-45 degrees.

5. A heat source built-in falling film humidifier according to claim 1, wherein:

the upper plate (4) extends above the gas channel pipe (13) and is lower than the distributor (2).

6. A heat source built-in falling film humidifier according to claim 1, wherein:

the distance between the heat exchange pipes (5) is 2-4 times of the diameter of the heat exchange pipes.

7. A heat source built-in falling film humidifier according to claim 1, wherein:

the liquid outlet holes (7) are of circular hole structures and are distributed in a circular and uniform manner.

8. The method of operating a falling film humidifier with a built-in heat source according to claim 1, comprising the steps of:

firstly, hot fluid enters a cavity of a distributor (2) through a heat source inlet (17) on a top plate (16), then uniformly enters a heat exchange tube (5), and the hot fluid after heat exchange is collected in a collector (8) and finally discharged from a heat source outlet (11);

the low-temperature liquid enters the space between the distributor (2) and the upper plate (4) from the liquid inlet (3), is sprayed on the outer wall of the heat exchange tube (5) through the nozzle (12) to form a uniform liquid film, fully exchanges heat with the hot fluid in the heat exchange tube (5) along with the falling of the liquid film, the temperature is continuously increased, the liquid is finally collected on the upper surface of the collector (8), enters the bottom of the cylinder (1) through the liquid outlet (7), and finally is discharged out of the cylinder (1) through the liquid outlet (9) on the bottom plate (10);

the air with low temperature and low humidity enters the space between tube bundles consisting of a plurality of heat exchange tubes (5) through an air inlet (6) at the bottom of the cylinder body (1), the temperature and the humidity are continuously increased through heat and mass transfer with a liquid film in the process of air rising, and finally the air with high temperature and high humidity enters the gas channel tube (13) on the upper plate (4) firstly, then is collected to the top space of the cylinder body (1) through an air outlet (14) on the distributor (2), and finally is discharged from an air outlet (15).

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