CN111495097A - Dust removal pretreatment device and method for water-vapor phase change coupling gradient magnetic field - Google Patents

Dust removal pretreatment device and method for water-vapor phase change coupling gradient magnetic field Download PDF

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Publication number
CN111495097A
CN111495097A CN202010300913.0A CN202010300913A CN111495097A CN 111495097 A CN111495097 A CN 111495097A CN 202010300913 A CN202010300913 A CN 202010300913A CN 111495097 A CN111495097 A CN 111495097A
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China
Prior art keywords
temperature
hot water
water
nucleation chamber
constant
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CN202010300913.0A
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Chinese (zh)
Inventor
徐欢欢
张军
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Southeast University
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Southeast University
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Priority to CN202010300913.0A priority Critical patent/CN111495097A/en
Publication of CN111495097A publication Critical patent/CN111495097A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D51/00Auxiliary pretreatment of gases or vapours to be cleaned
    • B01D51/02Amassing the particles, e.g. by flocculation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D51/00Auxiliary pretreatment of gases or vapours to be cleaned
    • B01D51/02Amassing the particles, e.g. by flocculation
    • B01D51/04Amassing the particles, e.g. by flocculation by seeding, e.g. by adding particles
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00Apparatus or processes for magnetising or demagnetising
    • H01F13/003Methods and devices for magnetising permanent magnets

Abstract

The invention discloses a dust removal pretreatment device for a water-vapor phase change coupling gradient magnetic field, which comprises an air compressor, an aerosol generator, a nucleation chamber, a constant-temperature hot water circulating system, a low-temperature constant-temperature air inlet system connected with the bottom of the nucleation chamber and a permanent magnet ring set axially arranged outside the nucleation chamber in a sleeved mode; wherein the upper part of the nucleation chamber is provided with an air outlet; the constant-temperature hot water circulating system comprises a hot water constant-temperature tank and a second temperature control unit; the low-temperature constant-temperature air inlet system comprises a low-temperature constant-temperature tank and a first temperature control unit; the air outlet of the air compressor is connected with the air inlet of the aerosol generator, the air outlet of the aerosol generator is connected to the air inlet at the bottom of the nucleation chamber through an air inlet pipe, the water outlet of the hot water thermostatic bath is connected with the water inlet of the side wall at the upper end of the nucleation chamber through a first water pipe, and the water inlet of the hot water thermostatic bath is connected with the water outlet of the side wall at the lower end of the nucleation chamber through a second water pipe.

Description

Dust removal pretreatment device and method for water-vapor phase change coupling gradient magnetic field
Technical Field
The invention belongs to the technical field of dust removal pretreatment, and relates to a dust removal pretreatment device and method for a water-vapor phase change coupling gradient magnetic field.
Background
The fine particles are important factors influencing human health, and the coal-fired power plant is one of main sources of the fine particles in the atmospheric environment, so the method has very important significance for the research of the fine particle removal technology of the coal-fired power plant. Because the particle size of the fine particles is very small, the fine particles are difficult to be effectively removed by the traditional dust removing equipment, and the current research direction for controlling the fine particles mainly has the following two aspects: firstly, the particle size of fine particles is increased by utilizing pretreatment measures and then removed by utilizing traditional dust removal equipment, and the method can utilize the original dust removal equipment to avoid resource waste and large amount of capital investment of the dust removal equipment in a coal-fired power plant; and the other is to develop a high-efficiency dust removal technology to remove fine particles, such as a wet electric dust remover, an electric bag composite dust remover and the like.
The common dedusting pretreatment technology comprises the following steps: electrical coalescence, acoustic coalescence, chemical coalescence, turbulent coalescence, magnetic coalescence, and vapor phase change techniques, among others. The principle of the water vapor phase change technology is as follows: in the supersaturation steam environment, steam condenses on the fine particle surface to produce thermophoresis and diffusion swimming effect simultaneously, promote fine particle migration motion, the mutual collision contact makes fine particle granularity increase, and the quality increases, thereby makes the granule easily receive inertial collision and entrapment. The principle of the magnetic coagulation technology is as follows: the fine coal particles are high-temperature composite compounds mainly composed of Fe-Si-Al substances, have high magnetic susceptibility, and are adhered together by collision under the combined action of magnetic interaction force and external magnetic field force after being magnetized by an external magnetic field to form particles with larger particle size.
In contrast to a uniform magnetic field, in a gradient magnetic field, fly ash particles are subjected to external magnetic field forces caused by the magnetic field gradient, in addition to magnetic dipole forces, gas drag forces, brownian forces, van der waals forces, and gravity. The particles with different particle sizes are subjected to different external magnetic field forces, so that the relative motion of the particles is facilitated in a gradient magnetic field, the particles are subjected to collision coalescence, the coalescence coefficient is increased, and the coalescence removal efficiency of the particles is improved.
Disclosure of Invention
In order to solve the problems, the invention discloses a dust removal pretreatment device for a water-vapor phase-change coupling gradient magnetic field, which comprises an air compressor, an aerosol generator, a nucleation chamber, a constant-temperature hot water circulating system, a low-temperature constant-temperature air inlet system connected with the bottom of the nucleation chamber and a permanent magnet ring group sleeved outside the nucleation chamber and arranged along the axial direction; wherein the upper part of the nucleation chamber is provided with an air outlet; the constant-temperature hot water circulating system comprises a hot water constant-temperature tank and a second temperature control unit; the low-temperature constant-temperature air inlet system comprises a low-temperature constant-temperature tank and a first temperature control unit, wherein an air inlet pipeline for cooling dust-containing flue gas is arranged in the low-temperature constant-temperature tank, and a first gas regulating valve is arranged between the air compressor and the aerosol generator; the air outlet of the air compressor is connected with the air inlet of the aerosol generator, and the air outlet of the aerosol generator is connected with one end of the air inlet pipe; the other end of the air inlet pipe penetrates through the low-temperature thermostatic bath to be communicated with an air inlet at the bottom of the nucleation chamber, and a second gas regulating valve and a gas flowmeter are arranged on a pipe section of the air inlet pipe between the air outlet of the aerosol generator and the inlet of the low-temperature thermostatic bath; the water outlet of the hot water thermostatic bath is connected with the water inlet of the side wall of the upper end of the nucleation chamber through a first water pipe, wherein a first hot water circulating pump and an upper liquid flowmeter are arranged on the water pipe; and a water inlet of the hot water thermostatic bath is connected with a water outlet of the lower end side wall of the nucleation chamber through a second water pipe, and a second hot water circulating pump is arranged between the water inlet of the hot water thermostatic bath and the water outlet of the nucleation chamber.
The invention further improves that: the permanent magnet ring group is composed of a group of permanent magnet rings with opposite magnetic field directions, and the distribution of the gradient magnetic field can be adjusted by adjusting the distance between the permanent magnet rings.
The invention further improves that: the sidewall of the nucleation chamber is provided with a thermometer, a pressure gauge and a magnetic flowmeter.
The invention further improves that: the nucleation chamber is a circular tube made of a high-hydrophobicity material.
The method for pretreating fine particles by the device comprises the following steps:
1) measuring the temperature and humidity of the environment where the device is located, calculating the dew point temperature, and setting the temperature of cold water in the low-temperature constant-temperature tank to be the dew point temperature through the first temperature control unit;
2) the temperature of hot water in the hot water constant temperature tank is set to the required temperature through the second temperature control unit, the second hot water circulating pump is started firstly, and then the first hot water circulating pump is started to realize the circulating flow of the hot water; finally, according to the hot water flow required by the experiment, a liquid flowmeter on a pipeline connected with the hot water thermostatic bath is adjusted to enable the hot water flow to reach a specified range;
3) measuring the magnetic field intensity in the nucleation chamber by using a magnetic flowmeter, and adjusting the permanent magnet ring set according to requirements to enable the magnetic field intensity in the nucleation chamber to be in a specified range;
4) opening an aerosol generator to generate fine particles with a certain concentration, then opening an air compressor, and rotating a first gas regulating valve to regulate the gas pressure to a proper range; measuring the gas flow at the outlet of the aerosol generator through the gas flowmeter, rotating the second gas regulating valve to enable the flow value shown by the gas flowmeter to reach a required value, and then disassembling the gas flowmeter;
5) the temperature and pressure in the nucleation chamber were measured using a thermometer and a manometer, and then the flow rate of the dust-laden gas was adjusted by adjusting the temperature and flow rate of the hot water so that the temperature and pressure in the nucleation chamber were within the desired ranges.
The technical effects are as follows: compared with the prior art, the device has the advantages of simple structure, convenient use and low cost, and the fine particles are subjected to heterogeneous nucleation, condensation and growth under the action of a supersaturated field and magnetic coalescence under the action of a gradient magnetic field in the nucleation chamber for the dust-containing gas with higher humidity and more metal elements due to the coupling of the two fine particle aggregation modes of water vapor phase change and the gradient magnetic field, so that the pretreatment efficiency can be obviously improved, and the growth effect of the fine particles is improved.
Drawings
FIG. 1 is a schematic structural diagram of the apparatus of the present invention.
List of reference numerals:
1-an air compressor; 2-a first gas regulating valve; 3-an aerosol generator; 4-a second gas regulating valve; 5-a gas flow meter; 6-low temperature constant temperature bath; 7-a first temperature control unit; 8, an air inlet pipe; 9-a flue gas outlet; 10-a nucleation chamber; 11-permanent magnet ring group; 12-a thermometer; 13-a pressure gauge; 14-a magnetic flowmeter; 15-a first water pipe; 16-a liquid flow meter; 17-a first hot water circulation pump; 18-a second temperature control unit; 19-hot water thermostatic bath; 20-a second hot water circulation pump; 21-second water pipe.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1, the dust removal pretreatment device for the water-vapor phase change coupling gradient magnetic field comprises an air compressor 1, an aerosol generator 3, a nucleation chamber 10, a constant temperature hot water circulation system, a low temperature constant temperature air inlet system connected with the bottom of the nucleation chamber 10, a permanent magnet ring set 11 axially arranged outside the nucleation chamber 10 in a sleeved mode, and an air outlet 9 arranged at the upper portion of the nucleation chamber 10.
The air compressor 1 can produce compressed air with certain pressure, an air outlet of the air compressor 1 is connected with an air inlet of the aerosol generator 3, and a first gas regulating valve 2 is arranged between the air compressor 1 and the aerosol generator 3.
The constant temperature hot water circulation system includes a hot water constant temperature bath 19, a second temperature control unit 18. A water outlet of the hot water thermostatic bath 19 is connected with a water inlet of the side wall of the upper end of the nucleation chamber 10 through a first water pipe 15, and a first hot water circulating pump 17 and a liquid flowmeter 16 are arranged between the water outlet of the hot water thermostatic bath 19 and the water inlet of the nucleation chamber 10; the water inlet of the hot water thermostatic bath 19 is connected with the water outlet of the side wall of the lower end of the nucleation chamber 10 through a second water pipe 21, and a second hot water circulating pump 20 is arranged between the water inlet of the hot water thermostatic bath 19 and the water outlet of the nucleation chamber 10.
The air outlet end of the aerosol generator 3 is connected with one end of an air inlet pipe 8; the other end of the air inlet pipe 8 penetrates through the low-temperature constant-temperature groove 6 to be communicated with an air inlet at the bottom of the nucleation chamber 10, and a second gas regulating valve 4 and a gas flowmeter 5 are arranged on a pipe section of the air inlet pipe 8 between the air outlet of the aerosol generator 3 and the inlet of the low-temperature constant-temperature groove 6.
The nucleation chamber 10 is a round tube made of high-hydrophobicity materials, and the bottom and the top of the round tube are respectively provided with a flue gas inlet and a flue gas outlet 9; the upper part and the lower part of the side edge are provided with water inlets and water outlets.
The permanent magnet ring set 11 is composed of a set of permanent magnet rings with opposite magnetic field directions, and the distribution of the gradient magnetic field can be adjusted by adjusting the distance between the permanent magnet rings. The low-temperature constant-temperature air inlet system comprises a low-temperature constant-temperature groove 6 and a first temperature control unit 7.
The sidewall of the nucleation chamber 10 is provided with a thermometer 12, a pressure gauge 13 and a magnetic flowmeter 14, and their measuring ranges can be selected according to the requirements of the actual application.
The method for promoting nucleation, collision, agglomeration and growth of fine particles by using the device and utilizing the water-vapor phase change coupling gradient magnetic field comprises the following steps:
1) the temperature and humidity of the environment where the device is located are measured, the dew point temperature is calculated, and then the temperature of cold water in the cryostat 6 is set to be the dew point temperature by the first temperature control unit 7.
2) The temperature of the hot water in the hot water thermostatic bath is set to a desired temperature by the second temperature control unit 18, the second hot water circulation pump 20 is turned on first, then the first hot water circulation pump 17 is turned on, and the flow rate of the hot water is adjusted to a proper level by the liquid flow meter 16.
3) The magnetic field intensity in the nucleation chamber is measured by using the fluxmeter 14, and then the magnetic induction intensity, the number and the distance of the permanent magnet rings in the permanent magnet ring group 11 are adjusted to the proper magnetic field intensity.
4) The aerosol 3 generator is opened to generate fine particles with a certain concentration, then the air compressor 1 is opened, and the first gas regulating valve 2 is rotated to regulate the gas pressure to a proper range. And measuring the gas flow at the outlet of the aerosol generator 3 through the gas flowmeter 5, rotating the second gas regulating valve 4 to enable the flow value shown by the gas flowmeter 5 to reach a required value, and then disassembling the gas flowmeter 5.
5) The temperature and pressure inside the nucleation chamber 10 are measured using the thermometer 12 and the manometer 13, and then the temperature and pressure inside the nucleation chamber 10 are brought within a desired range by adjusting the hot water temperature and flow rate, the dust-containing gas flow rate, and the like.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.

Claims (5)

1. The utility model provides a dust removal preprocessing device of steam phase transition technique coupling gradient magnetic field which characterized in that: comprises an air compressor (1), an aerosol generator (3), a nucleation chamber (10), a constant-temperature hot water circulating system, a low-temperature constant-temperature air inlet system connected with the bottom of the nucleation chamber (10) and a permanent magnet ring group (11) which is sleeved outside the nucleation chamber (10) and is axially arranged; wherein the upper part of the nucleation chamber (10) is provided with an air outlet (9); the constant-temperature hot water circulating system comprises a hot water constant-temperature tank (19) and a second temperature control unit (18); the low-temperature constant-temperature air inlet system comprises a low-temperature constant-temperature tank (6) and a first temperature control unit (7), wherein an air inlet pipeline for cooling dust-containing flue gas is arranged in the low-temperature constant-temperature tank (6), and a first gas regulating valve (2) is arranged between the air compressor (1) and the aerosol generator (3); an air outlet of the air compressor (1) is connected with an air inlet of the aerosol generator (3), and an air outlet end of the aerosol generator (3) is connected with one end of an air inlet pipe (8); the other end of the air inlet pipe (8) penetrates through the low-temperature constant-temperature tank (6) to be communicated with an air inlet at the bottom of the nucleation chamber (10), and a second gas regulating valve (4) and a gas flowmeter (5) are arranged on a pipe section of the air inlet pipe (8) between the air outlet of the aerosol generator (3) and the inlet of the low-temperature constant-temperature tank (6); a water outlet of the hot water thermostatic bath (19) is connected with a water inlet on the side wall of the upper end of the nucleation chamber (10) through a first water pipe (15), wherein a first hot water circulating pump (17) and a liquid flowmeter (16) are arranged on the first water pipe (15); the water inlet of the hot water thermostatic bath (19) is connected with the water outlet of the side wall of the lower end of the nucleation chamber (10) through a second water pipe (21), and a second hot water circulating pump (20) is arranged between the water inlet of the hot water thermostatic bath (19) and the water outlet of the nucleation chamber (10).
2. The dust removal pretreatment device of the water-vapor phase change technology coupled gradient magnetic field according to claim 1, characterized in that: the permanent magnet ring group (11) is composed of a group of permanent magnet rings with opposite magnetic field directions, and the distribution of the gradient magnetic field can be adjusted by adjusting the distance between the permanent magnet rings.
3. The dust removal pretreatment device of the water-vapor phase change technology coupled gradient magnetic field according to claim 1, characterized in that: the sidewall of the nucleation chamber (10) is provided with a thermometer (12), a pressure gauge (13) and a magnetic flowmeter (14).
4. The dust removal pretreatment device of the water-vapor phase change technology coupled gradient magnetic field according to claim 1, characterized in that: the nucleation chamber (10) is a round tube made of a high-hydrophobicity material.
5. A method for pre-treating fine particulate matter using the apparatus of claims 1-4, wherein: the method comprises the following steps:
1) measuring the temperature and humidity of the environment where the device is located, calculating the dew point temperature, and setting the temperature of cold water in the low-temperature constant-temperature tank (6) to be the dew point temperature through the first temperature control unit (7);
2) the temperature of hot water in the hot water thermostatic bath (19) is set to the required temperature through the second temperature control unit (18), the second hot water circulating pump (20) is started firstly, and then the first hot water circulating pump (17) is started to realize the circulating flow of the hot water; finally, according to the hot water flow required by the experiment, a liquid flowmeter (16) on a pipeline connected with a hot water thermostatic bath (19) is adjusted to enable the hot water flow to reach a specified range;
3) measuring the magnetic field intensity in the nucleation chamber (10) by using a magnetic flowmeter (14), and adjusting the permanent magnet ring set according to requirements to enable the magnetic field intensity in the nucleation chamber (10) to be in a specified range;
4) opening an aerosol (3) generator to generate fine particles with a certain concentration, then opening an air compressor (1), and rotating a first gas regulating valve (2) to regulate the gas pressure to a proper range; measuring the gas flow at the outlet of the aerosol generator (3) through the gas flowmeter (5), rotating the second gas regulating valve (4) to enable the flow value shown by the gas flowmeter (5) to reach a required value, and then removing the gas flowmeter (5);
5) the temperature and pressure in the nucleation chamber (10) are measured using a thermometer (12) and a pressure gauge (13), and then the flow rate of the dusty gas is adjusted so that the temperature and pressure in the nucleation chamber (10) are within a desired range by adjusting the temperature and flow rate of the hot water.
CN202010300913.0A 2020-04-16 2020-04-16 Dust removal pretreatment device and method for water-vapor phase change coupling gradient magnetic field Pending CN111495097A (en)

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CN202010300913.0A CN111495097A (en) 2020-04-16 2020-04-16 Dust removal pretreatment device and method for water-vapor phase change coupling gradient magnetic field

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CN202010300913.0A CN111495097A (en) 2020-04-16 2020-04-16 Dust removal pretreatment device and method for water-vapor phase change coupling gradient magnetic field

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