What are the criteria for choosing an electric furnace dust collector?

What are the criteria for choosing an electric furnace dust collector?

The electric furnace dust collector has the characteristics of compressed air dust removal, external filter dust removal, good dust removal effect, fully enclosed filtration area, external maintenance and repair, and easy operation. With the revision and improvement of regulations, as well as the increasing awareness of reducing operating costs, electric furnace dust collectors will become important equipment for dust removal. The amount and temperature of flue gas generated by electric furnace dust collectors vary greatly. During the feeding process, dust is mainly generated from scrap steel and slag during the feeding process. The required dust removal air volume is not large, and it is required that the dust does not spread and does not pollute the working environment around the electric furnace. During the power transmission process, the raw materials are heated by arc heating, which causes the combustion of combustible waste and produces exhaust gas. At this point, the electric furnace needs to heat the furnace material to a molten state, requiring the smoke and dust to be discharged in a timely manner without taking away too much heat from the furnace body to determine the steelmaking cycle.

Under the same processing air volume, the electric furnace dust collector should mix cold air as much as possible to ensure that the flue gas temperature is between 50 degrees Celsius and 100 degrees Celsius, which cannot burn the filter bag or reduce operating energy consumption. Under the same processing air volume, optimize the pipeline design to reduce system resistance. Under the premise of low energy consumption, obtaining a large processing air volume can achieve good capture effect. When choosing an electric furnace dust collector, we need to consider the following two aspects:

1、 Determination of filtering wind speed. Choosing the correct filtering wind speed is one of the important parameters for determining the structure of a dust collector, and its impact is crucial. In the application of similar dust collectors in China, there is a one-sided pursuit of low investment and land saving, while blindly copying the process experience to choose a filtration wind speed of up to 2.0-2.5M/MIN, without considering the application limits and appropriate working points of domestic filter materials. As a result, the service life of filter bags sharply decreases and "high resistance" occurs, the system air volume rapidly decreases in the short term, the operating cost increases, and the dust removal effect cannot be achieved.

2、 Offline dust cleaning. Offline dust cleaning is a means to avoid secondary adsorption of dust and can improve the dust cleaning rate. Among them, the dust collector purification chamber is designed as a small single room, and during the operation of the dust cleaning system, there are few rooms involved in offline dust cleaning. Closing the filtration area of one room has little impact on the entire system. Can ensure the long-term stable operation of the dust collector.

3、 Temperature control. The maximum allowable operating temperature for electric furnace dust collectors is 120 degrees Celsius (instantaneous). The flue gas with a temperature higher than 120 degrees Celsius entering the electric furnace dust collector will burn the cloth bag. The smoke generated in the production process of the metallurgical industry is commonly and simply controlled by using a field air valve to regulate the flue gas temperature.

4、 Determine the air volume for processing. The determination of system air volume is the key to the design of dust removal systems, and how to correctly calculate the required air volume of the dust removal system directly affects the success or failure of the dust removal effect.

The main steps for setting up an electric furnace dust collector system are as follows:

1、 Body: It consists of an upper box body, a middle box body, ash hopper components, maintenance doors, brackets, etc. For the body, we have designed its strength with unfavorable load combinations; Made of Q235-A sheet metal.

2、 Dust collection and filtration system: mainly composed of dust collector bag, dust collector frame, flower plate components, and inlet air distribution system.

3、 Spray cleaning and ash unloading system: mainly composed of gas pipelines, electromagnetic pulse valves, spray pipe components, and manual plug valves.

4、 The top of the electric furnace dust collector is equipped with an inspection door for maintenance and bag replacement (the maintenance, inspection, and bag replacement work of the dust collector can be carried out outside the machine without entering the interior of the dust collector).

5、 The electric furnace dust collector is equipped with an air distribution system and a filter bag fixing frame, which evenly distributes the dusty gas entering the dust collector to each filter bag. The use of the filter bag fixing frame prevents collisions and friction between the filter bags during the dust cleaning process, which is beneficial for extending the service life of the filter bags.

6、 The control system of the electric furnace dust collector adopts two types of control: manual and automatic.

7、 The dust removal bag adopts the standard specification of φ 133X2500mm, and the material is made of Flumes needle punched felt.

8、 The electric furnace dust collector adopts an external filter type, and the dust bag of the bag filter is connected to the flower plate through a spring expansion ring, forming a separation between clean air and dusty gas.

9、 During dust cleaning, the pulse control device sends a pulse signal to the electromagnetic pulse valve, which sprays compressed air through the spray pipe to radially deform the dust bag and shake off the dust.