Abstract:This article mainly discusses the development of efficiency in industrial dust removal systems, the development of large-scale dust removal systems, new devices for improving dust removal systems, and improvement examples of dust removal systems.

1.Development of Efficiency Direction for Dust Removal Systems

At present, various countries have increasingly strict requirements for smoke and dust emission concentration, and countries around the world tend to develop high-efficiency dust removal systems. In industrial air pollution control, there are many forms of dust removal, but electrostatic precipitator systems and bag filter systems have an overwhelming advantage. In the sales revenue of dust removal equipment in Japan, the proportion of electrostatic precipitators and bag filters in the entire dust removal market is45.5%and4%And wet dust collectors are only5.5%There are fewer whirlwind styles2.1%.

2.The development of large-scale dust removal systems

The processing capacity of large bag filters for flue gas can reach several hundred thousand to several million per hour? Tens of thousands of filter bags are gathered together and formed“Bag room”Flat bags occupy less space, so this dust removal device can be rapidly developed.

3.Development of new equipment direction

Wide spacing or pulse high-voltage electrostatic precipitators, annular jet bag filters, and downstream jet bag filters are all types of dust collectors20New dust removal equipment developed over the years.

Dust collectors that utilize multiple dust removal mechanisms to work together on the same new type of dust removal equipment have also made rapid progress, such as charged bag filters and charged water droplet wet scrubbers. In addition, there are new dust removal equipment such as high-pressure water jet and high-pressure steam jet.

According to the relevant forecast results of the Bag Dust Removal Committee of the China Environmental Protection Industry Association, the country is paying more and more attention to environmental protection. China has greatly increased its requirements for environmental protection since the 11th Five Year Plan. In order to meet the increasingly high environmental standards, it is expected that bag dust removal systems will dominate the market, which will also be a development trend.

4 New device for improving dust removal system

For dust removal systems, there are many valves that are not automatically controlled and belong to manual or electric valves. They need to be continuously adjusted on site to ensure a constant air velocity in the pipeline. The operation is cumbersome, increasing the workload of workers. Sometimes, workers do not operate in a timely manner, resulting in the inability to collect dust in a timely manner, polluting the environment and wasting resources.

Formula for wind speed and air volume of dust removal pipeline:Q=Sv；QFor air volume;SFor cross-sectional area;vFor wind speed.

Propose a new device for automatically controlling valves to maintain a constant wind speed in pipelines. It is also to improve the automatic control of the dust removal system. Below is an introduction to this device. It is mainly composed of wind blades, springs, gear sets, and valves.

A valve with automatic adjustment for constant wind speed, and the fan blades are connected through a connecting rod with a sleeve1with gears1Connection, the sleeve is fixed to the pipe wall through several support rods, the fan blade is located at the center of the pipe, and the gear1with gears2Engagement, through connecting rods2with gears3Connection, connecting rod2Vertical and penetrating pipeline, sleeve2Cover the connecting rod2And seal it, gear3Connecting rod3, gears4Connected together and supported by supports, gears5with gears4Mesh, a spring box is set on the outer surface of the valve stem and the pipe wall, with several pairs of grooves at the bottom of the spring box. The outer end of the spring is fixed to the spring box, and the center of the spring is connected to the connecting rod4Consolidation.

When not working, the valve plate is in the open state, and the spring selection is set to the wind speed. When the device is installed in the pipeline, with the increase of wind speed after ventilation, the fan blades start to rotate as the wind speed rises, and the fan blades in turn drive the connecting rod1, gears1, gears2, connecting rod2, gears3, connecting rod3, gears4, connecting rod4When the valve plate rotates and the connecting rod4When rotating, the mainspring converts kinetic energy into potential energy, and the valve plate controls the cross-sectional area of the wind in the pipeline, thereby controlling the air volume. When the potential energy of the mainspring increases to balance with the existing kinetic energy, the fan blades and gear set will be in a stationary state. At this time, the position of the valve plate after rotation will make the wind speed at the fan blades (front section of the device) reach the set wind speed.

5 Improvement Example of Dust Removal System

In response to the new national environmental emission standards and to improve dust removal efficiency, this article elaborates on the improvement plan for dust removal in sintering machine heads.

At present, the sintering machine head is equipped with an electrostatic precipitatorBCC340/2-3That is, a dual chamber three electric field dust collector, with the cathode using an electromagnetic hammer for top vibration and the anode using a flexible arm hammer for bottom vibration on the side.

In order to better meet the national exhaust emission standards80mg/mImprove environmental protection indicators. Add one more unit at the outlet of the main exhaust fan120A bag filter with a capacity of 10000 air, with a bag filtration area of approximately18000Square meters, equipped with a new fan system, with a total fan power of approximately1500KWIntroduce the exhaust gas from the fan outlet into this bag filter for filtration. The treated flue gas is discharged through the existing chimney, and the dust removal pipeline is connected to the existing desulfurization system pipeline to meet the needs of environmental inspection.

（1）Social benefits

After this bag filter is put into use, the emission concentration of the machine head chimney can be controlled within30mg/mWithin?, * will solve the problem of external discharge of the machine head. At the same time, it can effectively highlight the achievements of our company's environmental governance within the same industry, greatly reducing pollution to the atmospheric environment and promoting our company's practice“Play the social responsibility of central enterprises and maintain clear waters and blue skies in the western region”The environmental protection policy has laid a solid foundation, and the company will establish a good social image externally, which is of great significance to the construction of emerging steel brands.

（2）Economic benefits

At present, in order to ensure the external discharge of the chimney of the machine head, our department restricts or even eliminates the use of raw materials with high levels of harmful elements such as sulfur, potassium, and sodium that are prone to generate dust. The dust removal ash from the machine head is buried on the ground, which reduces the use of auxiliary materials in the raw material mixing and is extremely unfavorable for cost control. After the bag dust removal is put into use, the raw material mixing will no longer be affected by the composition of the exhaust gas and can be adjusted according to production cost needs. In addition, the dust removal ash from the electric dust removal of the machine head will not be used in a way that affects the quality of the sintered ore.

6 summary

The country's emphasis on environmental protection is increasing, and there are requirements for whether the environmental protection facilities of enterprises are complete and meet the standards. In this severe environmental situation, an improved device for dust removal system is proposed, which can adjust itself to keep the wind speed in the pipeline constant and achieve dust removal effect; Propose an improved example of dust removal system in traditional sintering machine head dust removal+The desulfurization system becomes a sintering machine head for dust removal+Bag dust removal+The desulfurization system can better meet the national emission standards.

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