CN108435419A - A kind of electrostatic precipitator of pre- agglomerated particle object - Google Patents

Abstract

The invention discloses an electrostatic dust removal device for pre-agglomerated particles, which includes an electrostatic dust collector, the outlet of the electrostatic dust collector is connected with a fan, and the inlet of the electrostatic dust collector is provided with a smoke channel, and the smoke channel is arranged in sequence according to the direction in which the smoke enters A suction arm section, a heating and humidifying section and a condensation growth section are connected; a heating chamber is arranged in the heating and humidifying section, and a hot water pipe is arranged in the heating chamber, and the two ends of the hot water pipe are connected with the shell of the evaporator respectively. The upper and lower ends of the evaporator are connected in series; the bottom of the shell side of the evaporator is connected in series with a filter, a high-pressure water pump, and an atomizing nozzle, and the outlet of the atomizing nozzle is arranged in the smoke pipe at the rear end of the heating chamber; A condensation chamber is arranged inside, and a cold water pipe is arranged inside the condensation chamber. The invention first humidifies and then cools the dusty air, thereby increasing the particle size of the particles, improving the conductivity of the dust, and improving the filtering efficiency of the electrostatic precipitator.

Description

An electrostatic precipitator for pre-agglomerated particles

technical field

The invention belongs to the field of pollutant removal equipment and removal technology, and relates to an electrostatic dust removal device for pre-agglomerated particles.

Background technique

Various processes in machining production will produce harmful fumes, and the particles in these fumes are difficult to remove due to their extremely small particle sizes, such as welding fumes generated during welding and metal particles generated in thermal spraying processes. Workers exposed to these fumes for a long time are prone to acute or chronic respiratory diseases, such as respiratory allergies, chronic bronchitis, lung cancer, middle nose cancer, etc. Therefore, the treatment of smoke and dust in the machining process is an urgent task in the current occupational health. The existing electrostatic precipitator is effective in removing micron-sized particles, but when it acts on ultrafine particles with a particle size of less than 1 μm, the efficiency is usually less than 80%. Devices removed by electrostatic precipitators.

Contents of the invention

The purpose of the present invention is to overcome the problem of low efficiency of the electrostatic precipitator in the prior art when removing submicron ultrafine particles, and propose an electrostatic precipitator for pre-agglomerated particles.

The technical solution adopted by the present invention to solve the technical problem is: an electrostatic dust collector for pre-agglomerated particles, including an electrostatic precipitator, the outlet of the electrostatic precipitator is connected to a fan, and the inlet of the electrostatic precipitator is provided with a smoke channel, so According to the entry direction of the smoke and dust, the smoke and dust passage is provided with an suction arm section, a heating and humidifying section and a condensation growth section in sequence;

A heating chamber is arranged in the heating and humidifying section, and a hot water pipe is arranged in the heating chamber, and the two ends of the hot water pipe are respectively connected with the upper and lower ends of the shell side of the evaporator; the bottom of the shell side of the evaporator is sequentially A filter, a high-pressure water pump and an atomizing nozzle are connected in series, and the outlet of the atomizing nozzle is arranged in the smoke pipe at the rear end of the heating chamber;

A condensation chamber is arranged in the condensation growth section, and a cold water pipe is arranged in the condensation chamber. Inlet of circulating water pump.

An L-shaped pipeline is connected between the heating and humidifying section and the condensation growth section.

The aperture of the atomizing nozzle is 0.2 mm.

The upper part of the shell side of the evaporator is provided with a water supply pipe.

The temperature range of the hot water in the hot water pipe is 60-80°C.

The temperature of the cold water in the cold water pipe is set to 20°C.

A suction hood is connected to the front end of the suction arm segment.

The tube side outlet of the evaporator is connected to the compressor inlet, the compressor outlet is connected to the tube side inlet of the condenser, and the tube side outlet of the condenser is connected to the tube side of the evaporator through a throttle valve. program entrance.

The pipes of the evaporator, compressor, condenser and throttle valve are connected by copper pipes filled with refrigerant.

A casing is arranged on the outside, a louver is arranged on the rear wall of the casing, universal wheels are arranged on the bottom of the casing, and handrails are arranged on the upper part of the casing.

Principle of the process of the present invention:

Under supersaturated conditions, particles grow through the condensation of water vapor, and the particle growth rate depends on the particle diameter Dp and the supersaturation rate SSR, SSR=p∞/ps, where p∞ is the partial pressure of water vapor in the air, and ps is The pressure of saturated water vapor. Particles whose particle diameter Dp is smaller than the molecular mean free path λ grow through irregular collisions with the corresponding free molecules, and finally form droplets containing particles. The formula (1) is the growth rate of the droplets:

M is the molecular mass of water, ρp is the density of water droplets, αc is the condensation coefficient, usually 0.04, m is the mass of a single water molecule, k is Boltzmann's constant, Na is Avogadro's constant, T is water vapor temperature, pd is the water vapor pressure on the droplet surface. Particles whose particle diameter Dp is greater than the molecular mean free path λ grow by the diffusion of water vapor on the surface of the particle, and the formula (2) is the growth rate of the droplet:

where Dv is the diffusion coefficient of water vapor, R is the gas constant,

Neglecting the Kelvin effect, pd≈ps, formula (2) becomes formula (3)

Therefore, the particle growth rate has a linear relationship with the supersaturation rate SSR.

Beneficial effects of the present invention:

1. The present invention first heats and humidifies the air containing smoke and dust into saturated humid air, and then cools the air, so that the water molecules in the air condense on the surface of the particles, and the water molecules spontaneously condense into small water droplets at the same time, so that the number of particles in the air increases , the Brownian collision strengthens, the particles coagulate and grow up, and finally the particle size increases from submicron to micron; at the same time, the water vapor molecular film adhering to the surface of the particles improves the electrical conductivity of the dust and reduces the specific resistance of the particles ; The moisture content of the flue gas and the increased water molecules between the electrode plates reduce the insulation properties of the air medium between the plates, resulting in an increase in the current at the same voltage, which is beneficial to the charging of the particles. In summary, the present invention can improve the dust removal efficiency of the electrostatic precipitator.

2. The present invention uses compressors for refrigeration and heating, which can save energy while meeting design requirements.

Description of drawings

Fig. 1 schematic diagram of device structure of the present invention;

Reference signs: 1. Shell, 2. Evaporator, 3. Compressor, 4. Condenser, 5. Throttle valve, 6. Smoke pipe, 7. Electrostatic precipitator, 8. Fan, 9. Universal wheel, 10. Armrest, 11. Suction arm, 12. Suction hood, 13. Heating chamber, 14. Hot water pipe, 15. High pressure water pump, 16. Atomizing nozzle, 17. Circulating water pump, 18. Cold water pipe, 19. Condensation chamber, 20. water supply pipe, 21. shutter window, 22. filter, 23. copper pipe.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the explanatory text.

As shown in Figure 1, the present invention provides an electrostatic precipitator for pre-agglomerated particles, including an electrostatic precipitator 7, the entrance of the electrostatic precipitator 7 is provided with a smoke channel 6, and the smoke channel 6 is sequentially arranged according to the direction in which the smoke enters There is a suction arm section, a heating and humidifying section, and a condensation growth section; an L-shaped pipeline is connected between the heating and humidification section and the condensation growth section in this embodiment, and the suction arm section in this embodiment is set There is a suction arm 11. In this embodiment, the outside of the suction arm 11 presents an arc-shaped structure, and the front end of the suction arm section is connected with a suction cover 12;

The device is provided with a casing 1 outside, with universal wheels 9 at the bottom, and a handrail 10 at the top for easy movement. The casing 1 is connected with a suction arm 11 that can inhale smoke and dust. There is a support frame inside the casing 1 for fixing various parts; The outlet of the electrostatic precipitator 7 is connected to the fan 8, and the fan 8 is facing the shutter window 21 on the rear wall of the housing 1;

In order to fully heat the air, a heating chamber 13 is arranged in the heating and humidifying section, and a hot water pipe 14 is arranged in the heating chamber 13. In this embodiment, the temperature range of the hot water in the hot water pipe 14 is 60-80 °C, both ends of the hot water pipe 14 are respectively connected to the upper and lower ends of the shell side of the evaporator 2; the evaporator 2 in this embodiment is a water tank evaporator, and the bottom of the shell side of the evaporator 2 is connected in series Filter 22, high-pressure water pump 15 and atomizing nozzle 16, filter 22 described in this implementation is a Y-type filter, the aperture of atomizing nozzle 16 described in this embodiment is 0.2mm, the sprayed water mist under high pressure The particle size of the water droplets in the water can reach the micron level, and can quickly evaporate in the air at 60°C. The outlet of the atomizing nozzle 16 is set in the smoke pipe at the rear end of the heating chamber 13, and the air becomes saturated humid air here. The upper part of the shell side of the evaporator 2 is provided with a water supply pipe 20, which passes through the shell 1. Since the hot water used by the atomizing nozzle 16 comes from the evaporator 2, in order to ensure the use effect, it should be regularly supplied to the evaporator 2 through the water supply pipe 20. replenish water;

A condensation chamber 19 is provided in the condensation growth section, and a cold water pipe 18 is arranged in the condensation chamber 19. The temperature of the cold water in the cold water pipe 18 is set to 20° C., so that the water vapor in the air is cooled and condensed on the surface of the particles. Both ends of the cold water pipe 18 are respectively connected to the outlet of the circulating water pump 17 and the shell-side inlet of the condenser 4, and the shell-side outlet of the condenser 4 is connected to the inlet of the circulating water pump 17. In this embodiment, the condenser 4 is water-cooled type condenser;

The tube side outlet of the evaporator 2 is connected to the compressor 3 inlet, the compressor 3 outlet is connected to the tube side inlet of the condenser 4, and the tube side outlet of the condenser 4 is connected to the The inlet of the tube side of the evaporator 2, the tube side of the evaporator 2, the compressor 3, the condenser 4 and the throttle valve 5 are connected by copper pipes 23 filled with refrigerant.

When the present invention is in use, dust-laden air is sucked into the dust pipe 6 from the suction hood 12 and the suction arm 11 by the fan 8, heated by the hot water pipe 14 in the heating chamber 13, and then the atomizing nozzle 16 sprays water mist into the air. Air, the air becomes saturated humid air at 60-80°C, and enters the condensation chamber 19 after passing through an L-shaped smoke pipe 6, and is cooled by the cold water pipe 18 at 20°C in the condensation chamber 19, and the water molecules in the air condense on the surface of the particles, The particles condense and grow, and then enter the electrostatic precipitator 7 to be removed, and the purified clean air is discharged from the device through the fan 8.

The basic principles, main features and advantages of the present invention have been shown and described above. For those skilled in the art, various changes can be made to the above exemplary embodiments without departing from the principles and spirit of the present invention. , the scope of the invention is defined by the appended claims and their equivalents.

Claims (10)

1. a kind of electrostatic precipitator of pre- agglomerated particle object, including electrostatic precipitator, which is characterized in that the electrostatic precipitator Outlet is connected with wind turbine, and the electrostatic precipitator entrance is provided with smoke dust duct, according to the flue dust side of entrance on the smoke dust duct Increase section to air suction arm section, warming and humidifying section and condensation is disposed with；

It is provided with heating chamber in the warming and humidifying section, hot-water line, the hot-water line both ends difference are provided in the heating chamber It is connect with the shell side upper and lower end of evaporator；The shell side bottom of the evaporator is sequentially connected in series filter, high-pressure hydraulic pump and atomization spray The outlet of mouth, the atomizer is arranged in the fume ducts of the heating cavity rear end；

The condensation, which increases in section, is provided with condensation chamber, and cold water pipe, the cold water pipe both ends difference are provided in the condensation chamber The outlet and condenser shell side inlet, the condenser shell-side outlet for connecting water circulating pump connect the entrance of the water circulating pump.

2. a kind of electrostatic precipitator of pre- agglomerated particle object according to claim 1, which is characterized in that the heating adds It is connected with one section of L-type pipeline between wet section and condensation growth section.

3. a kind of electrostatic precipitator of pre- agglomerated particle object according to claim 1, which is characterized in that the atomization spray The aperture of mouth is 0.2mm.

4. a kind of electrostatic precipitator of pre- agglomerated particle object according to claim 1, which is characterized in that the evaporator Shell side top be provided with water supply pipe.

5. a kind of electrostatic precipitator of pre- agglomerated particle object according to claim 1, which is characterized in that the hot-water line Interior hot water temperature's range is at 60-80 DEG C.

6. a kind of electrostatic precipitator of pre- agglomerated particle object according to claim 1, which is characterized in that the cold water pipe Inner cold water temperature setting is 20 DEG C.

7. a kind of electrostatic precipitator of pre- agglomerated particle object according to claim 1, which is characterized in that the air suction arm Duan Qianduan is connected with air-suction cover.

8. a kind of electrostatic precipitator of pre- agglomerated particle object according to claim 1, which is characterized in that the evaporator Tube side outlet be connected to suction port of compressor, the compressor outlet is connected to the tube-side inlet of the condenser, the condensation The tube side outlet of device is connected to the tube-side inlet of the evaporator by throttle valve.

9. a kind of electrostatic precipitator of pre- agglomerated particle object according to claim 1, which is characterized in that the evaporation Device, compressor, condenser and the tube side of throttle valve use the copper pipe full of refrigerant to connect.

10. a kind of electrostatic precipitator of pre- agglomerated particle object according to claim 9, which is characterized in that outside setting There are shell, the housing back wall face to be provided with shutter, the outer casing bottom is provided with universal wheel, the shell upper setting There is handrail.