What kind of dust removal equipment is suitable for coal mines?

Explosion-proof dust collectors, of course, should also be selected according to the working conditions of the site.

We all know that coal mines will produce a large amount of coal dust in the production process, which will not only cause pollution to the atmospheric environment, but also seriously endanger the health of coal miners, who inhale a large amount of dust for a long time, so as to replace it with a serious occupational disease - pneumoconiosis. Coal mines need to take corresponding dust removal measures, so what kind of dust removal equipment is suitable for coal mines?

Coal mines emit a large amount of dust into the air in all aspects of production, storage, transportation and roadway excavation. Especially in workplaces with high wind speeds, dust emissions have skyrocketed. In order to prevent the occurrence of malignant accidents such as mine gas and coal dust, and improve the labor and health conditions of mines, it is necessary to take corresponding treatment measures for dust sources to achieve the purpose of comprehensive treatment of dust.

The commonly used methods in coal dust control in coal mines include coal seam water injection, spray dust removal, dust collector dust removal, foam dust removal, etc., and the following table is a comparison of four dust removal technologies.

Among them, Xuzhou PATEO's foam dust suppression technology has a good treatment effect on coal dust in coal mines, with good foam dust suppression covering performance, forming a foam body without voids to cover the dust source and prevent the dust from spreading to the outside world; The contact area is large, and the total volume and total surface area of the same volume of liquid sprayed out in the form of foam are 30 to 50 times larger than that of water mist. This greatly increases the chance of collision with dust particles; The wetting speed is fast, and the foam contains additives, which increases the speed at which the dust is wetted; Good adhesion performance, the foam has good viscosity, which increases the adhesion efficiency of foam and dust; The small size of the equipment makes up for the shortcomings of the large volume of the dust removal fan, the cumbersome work of carrying the water tank, and the fact that it cannot be applied to high gas mines and mines with low roadways compared with the dust removal fan.

Coal dust control in coal mines should be based on the characteristics of each dust source, different treatment measures should be taken at different working faces, and a variety of dust removal methods should be used in series with each other to achieve a more ideal dust removal effect.

: The following security supplies are included in several categories used in coal mines:

1.Labor protection supplies, cotton tooling, gloves, helmets, waterproof rubber boots, miner's lamps, personal first aid, roadway signs, underground electronic signal signs, etc.

2.Safety tools: air picks, electric drills, hydraulic drilling rigs, electrical tools, etc.

3.Safety monitoring system: gas monitoring, monitoring, personnel monitoring, output monitoring, belt centralized control, water pump, fan, air compressor, transmission line monitoring, etc., emergency wireless communication, dispatching communication, etc.

4.Mining production equipment: roadheaders, conveyors, scrapers, etc.

These products are products that must be paid attention to in safe production, and the live equipment must have a coal safety certificate and explosion-proof certificate, and special products must also have special product certification.

All kinds of transformers. Winch. Feed switch.

Rock drill. Bolters. Compressor fan.

Bucket machine. Hydraulic support. Fully mechanized mining machine.

Comprehensive excavators. Electric locomotive. Belt and chain conveyors.

Fans. Water pump. Spraying machine.

Miner's lamp charging cabinet. Time Attendance Machine. Gas monitoring probes.

Cornerer. Reducer. Gas extraction pump.

Exploratory drilling rigs. Electric pickaxes. Wind pick.

Carrier wave**. Dodge.

Huarui Electric's coal mine dust removal equipment covers a variety of technologies and systems, each with its own unique features and benefits. The following is a summary of the features and benefits of each system:

1.Micron-level dry fog dust suppression system and equipment:

Features: By shearing the water into water mist particles below 10um, it can effectively adsorb and coalesce the dust suspended in the air, so as to achieve the dust suppression effect.

Advantage: Dry mist particles are similar in size to dust particles with the highest chance of adsorption, filtration, and coalescence. Through the sonic boom of high-frequency sound waves, water can be highly atomized into fine water mist particles, and dust can be effectively suppressed.

2.Belt surface dust source cleaning system and equipment:

Features: The belt cleaning box can clean the materials on the belt, prolong the service life of the belt, and solve the environmental pollution problem caused by the belt return trip.

Advantages: small size, easy installation; With the cleaning roller, the operation is stable and the resistance is small; Automatic drying to prevent belt slippage; Return material**, no secondary pollution; At the same time to protect the belt use.

3.Micro-power non-powered dust removal system and equipment:

Features: Using the principle of aerodynamics, a closed microcirculation space is designed between the dust generation point and the blanking chute, the internal material movement is promoted by the micro-dynamic dust collector, the negative pressure is generated with the help of the inertial movement of the material, and the dust removal effect is achieved through decompression filtration, sedimentation and filter bag removal.

Advantages: no power consumption or low power consumption, low operating costs; No secondary pollution; It can be connected to the platform for centralized control; The inverter control is used to effectively control the wind speed and air volume. Talk about socks to take.

4.Mine Negative Pressure Induced Dust Removal System and Equipment:

Features: The dust-containing gas is sucked into the negative pressure equipment by using the negative pressure source, and the separation of air and dust is realized through the relative movement between the solid and liquid, so as to achieve the purpose of purification. It has strong adaptability, with the characteristics of explosion-proof, high temperature, high humidity and viscosity.

Advantages: compact structure, easy installation, light weight; Hydropower energy consumption is small, reducing maintenance; The dust removal rate is high, and it reaches the standard of industrial-grade operation; Low operating vibration and low noise; It can be connected to the smart mine platform.

5.Mine Dry Dust Removal Fan:

Features: It is mainly used in coal mine excavation, cutting, spraying and other working faces, which solves the problem of safe explosion-proof treatment of high-concentration flammable and explosive dust, and adapts to the requirements of complex underground environmental conditions.

Advantages: Frequency converter control, low noise; High dust removal efficiency; Low energy consumption, zero water consumption, no secondary pollution; It can be connected to the smart mine platform.

The features and benefits of these systems and equipment can be selected for use in specific applications and needs for efficient dust collection and environmental protection.

Abstract: Open-pit mines will produce a large amount of dust in each link of operation and production, which requires the mine dust collector to carry out dust treatment, the working principle of the mine dust collector is to enter the dust-containing gas tangentially into the upper space of the filter chamber, purify the air after a series of treatments, and finally discharge it into the atmosphere. The mine dust collector equipment is mainly used to deal with the dust generated in all aspects of the mine, such as perforation, rock drilling, blasting, etc.

The operating principle of the mine dust collector is to enter the upper space of the filter chamber in the tangential direction, and the ash hopper is rotated along the cylinder wall under the effect of centrifugal force of large particles and condensed dust particles, and the small particles are dispersed in the open space between the bags in the filter chamber and then retained, and the purified air is gathered in the cleaning room through the filter bag guide port on the flower board, and is inhaled by the ventilator and discharged into the atmosphere. With the progress of the filtration condition, the dust is attached to the surface of the dust removal bag, and the resistance of the dust removal bag is gradually increased, and when the upper limit of the anti-blowing control resistance is reached, the differential pressure transmitter connected to the interface before and after the dust collector sends a signal to actively start the anti-blowing organization operation.

Second, the mine dust removal equipment is used in the first place.

The main function of the mine dust collector is to deal with the perforation, drilling, blasting, shipment, crushing and other processes of mine crushing, open-pit mining or underground mining, and dust is emitted, which seriously pollutes the working environment and atmospheric environment. Dry rock drilling without dust prevention measures, the working flour dust concentration per meter. It can be up to hundreds or thousands of milligrams.

When there are no dust prevention measures in the underground crushing chamber, the dust concentration is up to thousands of milligrams per meter.

1. The mine dust collector acts on the dust removal of mining, crushing and other industries.

2. The mine dust collector acts on absorbing various dust gases.

3. The mine dust collector can usually be used at room temperature below 120, and can also provide high temperature equipment below 250, and the equipment can be made of carbon steel or stainless steel.

4. The mine dust collector acts on the beneficiation, crushing and screening of various metal ores, and the transfer of belt conveyors.

1. Electrostatic precipitator.

1) High dust removal efficiency: The electrostatic precipitator can improve the dust removal efficiency by increasing the number of electric fields, increasing the cross-sectional area of the electric field, and improving the quality of power supply to meet any required dust removal efficiency. For fine dust with a particle size of less than 10 microns, there is still a high dust collection efficiency.

2) The equipment operation resistance is small and the total energy consumption is low: the operating resistance of the electrostatic precipitator is 200-300pa, which is about 1 8 of the bag filter and 1 4 of the electric bag precipitator.

3) Large amount of flue gas treated: At present, the maximum cross-section of a single electrostatic precipitator reaches 800m2

The flue gas treatment capacity reaches 3 million m3

h。(4) The operating temperature is high, which can meet different operating conditions: the general electrostatic precipitator can be used to process 350 o

c. Flue gases below c. (5) Low operation and maintenance costs, long service life of equipment: due to the maturity of electrostatic precipitator design and manufacturing technology, during an overhaul of the electrostatic precipitator in a new power plant, there is basically no other cost except for the replacement of some wear-resistant and wearing parts.

A large number of electrostatic precipitators are still intact after more than ten years of operation, and the long service life of the equipment is incomparable with other dust collectors.

2. Bag dust collector.

The bag filter is suitable for all kinds of coal because it is not affected by the physicochemical characteristics of flue gas, and has high dust removal efficiency, emission concentration is less than 50mg nm3, and has developed rapidly in the past few years. The general pressure loss of the bag filter is less than 2000pa, the system resistance is large, and the energy consumption of the fan is greater; For special dusts, such as low sulfur and high specific resistance dust, high SiO2, high Al2O3, and there is a risk of CO and it is difficult to meet the standard with conventional electrostatic precipitators, bag filters can be used.

3. Electric bag dust collector.

Advantages of electric bag dust collectors.

The electric bag composite dust collector captures 80 90 flue gas dust through the pre-electrostatic precipitator area, and captures a small amount of residual dust in the post-filter bag filter area. At the same time, the charged dust generated through the pre-electric field area can effectively improve the filtration characteristics of the dust layer deposited on the surface of the filter bag, so that the air permeability and ash cleaning performance of the filter bag can be greatly improved, so as to achieve the effect of low resistance and efficient dust collection. This technology combines the two dust removal characteristics of electrostatic precipitator and filter bag dust removal, and its dust removal efficiency is not affected by coal type, flue gas working conditions, and fly ash characteristics, and the emission concentration can be high efficiency and stable below 50mg nm3 or even 30mg nm3 for a long time.

Compared with pure bag filters, the dust collector can maintain a low operating resistance during operation.

It depends on what capacity you are, if you have medium pressure, the main consideration is the water film dust collector, which is a whole equipment. For high pressure, there are two main types: electrostatic precipitator and bag filter.

You can choose electrostatic precipitator, but the current emission standard is improved, and the bag dust removal can meet the dust removal standard, but it is necessary to cool down first, and then use PPS filter bag dust removal.

At present, most of the supercritical units use electrostatic precipitators and bag filters.

I** waste dust bag.

Coal-fired power plant dust removal is now using pulse bag filter or electric bag composite dust collector, pulse bag filter is the selection of high-temperature resistant bags, the body has thermal insulation measures, because the coal-fired boiler flue gas contains high-temperature smoke and sulfur dioxide and other exhaust gases, and the bag filter will also install desulfurization equipment.

At present, the dust removal system of coal-fired power plants includes: cyclone dust collector + cooling tower (flame arrester) + bag dust collector + desulfurization tower + chimney.

At present, the methods to solve the dust of coal preparation plant are mainly divided into closed exhaust dust removal method and closed spray dust reduction method. The dust collectors that adopt the closed exhaust dust removal method include bag (dry) dust collector and impulse (wet) dust collector 1. However, there are problems with the use of the dust collector.

In the process of dust removal, the bag filter is very easy to absorb the moisture in the air and cause the bag to stick, so that the ventilation resistance increases, the exhaust volume decreases, and the dusty air overflow cannot be controlled. In addition, due to the drop in wind speed, the dust in the ventilation duct will settle down and block the duct, making the dust collection system ineffective. The above problems are also prone to occur during the use of impulse (wet) dust collectors.

In addition, in the treatment of dust, the bag (dry) dust collector is very easy to produce secondary pollution. Impulse (wet) dust collectors, on the other hand, require a continuous discharge of the sewage system and the subsequent sewage treatment system. The above two methods, electrical equipment, pipeline engineering, etc., have a large investment, and most factories lack the space to arrange these systems, and the use is restricted.

Ultrasonic atomization dust suppression technology is one of the methods of spray dust reduction, the technology does not need to extract the dust-containing air flow and then treat it, but directly suppress the dust at the dust production point, at the same time, due to the fine droplets, the water consumption is very small, and the humidification of the material after dust suppression will not affect the process. Therefore, it has the following advantages:

1) It can simplify the management of dust collection. The traditional exhaust dust removal system generally has many dust removal equipment and large management volume, and the exhaust air at each dust production point is difficult to achieve the expected effect due to the huge pipe network and complex air volume adjustment at each air distribution point, and it is rarely used on site. As long as the water and compressed air are transported to each dust production point, the entire dust removal system can be easily controlled by a central control room.

2) The dust suppression technology does not need to clean the ash, which avoids secondary pollution, thus improving the working conditions of the dust removal management personnel.

3) The dust suppression system occupies little space, which can save the effective space in the plant and reduce the infrastructure investment.

4) The dust suppression system does not need fans, dust collectors and ventilation ducts, which saves 30% and 50% of the investment compared with the general dust removal system, and the installation time can be reduced by 70%.

5) Compared with the general dust collector, the dust suppression technology can save 50% of energy consumption and greatly reduce the operating cost of dust removal.

6) The ultrasonic atomization dust suppression system has simple structure, good reliability, low maintenance amount and low maintenance cost.