Application examples and working principles of single machine bag filter system, advantages and disadvantages

Application examples and working principles of single machine bag filter system, advantages and disadvantages

[1] Application of Single Unit Pulse Dust Removal Equipment System in Our Factory

There are various forms of dust removal covers for single machine bag dust collectors, including umbrella shaped dust removal covers, partially enclosed dust removal covers, and side suction dust removal covers. The suction airflow of umbrella shaped dust removal covers is easily affected by indoor horizontal airflow in our factory. To prevent dust from being brought into the room by horizontal airflow, umbrella shaped dust removal covers are better arranged against the wall. When the process conditions permit, movable baffles can be installed around the umbrella shaped cover. In order to increase the hood and wind speed without increasing the air volume, a baffle can be added inside the hood to improve the suction effect. However, side suction hoods are often used only when various forms of closed hoods cannot be installed under certain process or operation requirements. The effect of side suction hoods is worse than that of umbrella shaped hoods, and the required suction volume is also larger than that of umbrella shaped hoods. However, in many cases, such as the iron pouring place purchased from our factory's 120 ton slag room, cabinet type side suction hoods are designed due to the height of the overhead crane, and the dust removal effect also meets the design requirements. Local closed dust removal hoods are commonly used in our factory, mainly used for various raw material transfer belts. Local closed hoods should have negative pressure at all points inside the hood, and the suction volume should be appropriate. The view that the larger the suction volume, the better is not only true, but generally speaking, the wind speed inside the exhaust hood is 0.25-0.37m/s. Airflow does not cause stationary materials to dissipate into the air. When the angular wind speed reaches 2.5-Sn, the materials may be carried away by the airflow.

The single machine pulse dust removal equipment has a simple structure, does not require dedicated personnel to operate, has few vulnerable parts, the service life of the electromagnetic pulse valve can reach more than 1 million times, and the service life of the filter material is 30000 hours. It only needs to replace the electromagnetic pulse valve and single machine pulse dust removal equipment regularly, and has offline maintenance function to avoid losses caused by shutdown maintenance; The electric field part of the electric bag composite dust collector needs to be equipped with specialized maintenance personnel, and the machine needs to be stopped during maintenance. Taking a 75t/h boiler as an example, the operating costs of the two are compared, calculated based on an annual usage of 6500 hours, 3 years of major repairs, and an electricity price of 0.4 yuan/kWh.

[2] Working principle and advantages and disadvantages of pulse dust removal equipment

Nowadays, the air pollution situation is quite serious, and the pollution situation in China is particularly prominent. In order to improve air quality, the supervision of exhaust emissions has been increased, especially the control of the main culprit of acid rain emissions. Many thermal power plants and steelmaking enterprises have begun to adopt the combustion technology of circulating fluidized clean coal. After adding lime as a desulfurizer in coal-fired boilers, the resistance ratio of dust generated is very high. Meanwhile, in most regions of our country, the quality of coal combustion is not high, and the dust generated after coal combustion has a high electrical resistance ratio, resulting in a decrease in the dust removal efficiency of electrostatic precipitators, and the emitted smoke and dust cannot meet the standards. However, by using bag type dust removal method, sulfur and submicron particles can be effectively removed even in the case of dust removal.

1. Working principle of pulse dust removal equipment

Pulse dust removal equipment is a device that removes dust in dry conditions. This device first uses the over pulse dust removal equipment to capture the exhaust gas from the flue containing dust, and then filters the secondary absorbed smoke using the attached smoke dust. The working principle of this dust collector is that when the gas containing dust enters the pulse dust removal equipment, the velocity of the gas will decrease, and the heavier smoke particles will settle into the ash hopper due to gravity. When the gas containing smaller dust passes through the pulse dust removal equipment, the dust particles will bypass the fiber structure and collide with the fibers due to inertia, thus purifying other filtered components. However, when the accumulated amount of dust reaches a certain level, the pressure difference between the inside and outside of the pulse dust removal equipment cannot meet the conditions, so the pulse dust removal equipment should be regularly cleaned.

The dust removal effect of a dust collector largely depends on the selection of pulse single machine dust removal equipment and the method of cleaning dust. When selecting pulse dust removal equipment, factors such as heat resistance and mechanical strength should be considered. The dust cleaning methods can be divided into five types: gas ring blowback method, mechanical vibration method, pulse method, sound wave method, and composite action method. Usually, pulse blowing is a widely used method because it has good dust cleaning effect, and the intensity and frequency of pulse blowing can be adjusted.

2. Advantages of pulse dust removal equipment

Pulse dust removal equipment has the advantage of not being affected by dust resistance, concentration, and dust particle size; The work adopts a segmented chamber structure. When a certain part malfunctions, it can be repaired in rotation without affecting the normal operation of the boiler; The particle concentration discharged by the white pulse dust removal equipment is very low, which is not easy to cause air and water pollution. In short, pulse dust removal equipment has the advantages of long service life, simple structure, and easy daily maintenance.

3. Disadvantages of pulse dust removal equipment

The maintenance and operation requirements for pulse dust removal equipment are relatively high, and some internal conditions of the boiler will affect the service life of the pulse dust removal equipment, thereby directly affecting the economy of the pulse dust removal equipment.