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Filter Bag Cage To Ensure The Stable Operation Of The Entire Equipment

This paper mainly introduces the common damage forms of the Filter Bag Cage in the actual use process, and makes a brief theoretical analysis of these damaged forms. According to the engineering example, this phenomenon is demonstrated, and the cause of the failure of the Filter Bag Cage is analyzed.

1 Introduction

Filter Bag Cage as the heart of the bag filter, the effectiveness of the use of bag filter play a decisive role. In particular, high temperature Filter Bag Cage in the proportion of the value of a large number of dust, to protect the Filter Bag Cage, to prevent the Filter Bag Cage due to various reasons of damage, on the one hand, you can ensure that the filter effect to meet the emission concentration; the other hand, can reduce the economy Loss, to ensure the stable operation of the entire equipment.

2, Filter Bag Cage damage type

2.1 Mechanical damage

Mainly for the filter non-woven layer worn, off, this phenomenon is due to uneven distribution of air flow, dust in the high filter wind speed on the Filter Bag Cage surface erosion caused; or because the Filter Bag Cage is not in place, resulting in Filter Bag Cage The friction between the broken; or injection pipe installation is not vertical, resulting in the mouth 30-40 cm range of holes, loss of filtration performance.

Specific performance in the Filter Bag Cage mouth damage, Filter Bag Cage bag body damage, the lower part of the bag damage, the bottom of the bag damage.

2.1.1 dust Filter Bag Cage pocket parts

Filter Bag Cages pocket parts damage more in the pocket down 30-40 cm below, and more performance for the bottom of the filter blown, off. Mostly for the compressed air is too high, spray tube skew, deformation of the board and other reasons, in the installation process to pay attention to the quality of installation.

2.1.2 bag bag body position

Filter Bag Cage and skeleton contact part of the long-term due to pulse jet caused by contact part of the wear and tear, the performance of the vertical and horizontal tendons in the direction of wear and tear traces. Pay attention to the size of the Filter Bag Cage and skeleton with the surface of the dust skeleton finish.

2.1.3 Bottom of the bag is damaged

Filter Bag Cage bottom phenomenon is more common wear and tear, may be due to the bottom of the bag cage is too small or bag too long, bag cage can only make the bottom of the bottom of the bag. Filter Bag Cage cleaning and filtration when the action is too large inside the bottom of the Filter Bag Cage wear. Or dust accumulation is too high to form eddy current wear Filter Bag Cage.

2.2 Chemical corrosion

The most obvious manifestation of chemical corrosion is the sharp drop in the strength of the dust bag, which is manifested in acid corrosion, alkali corrosion, oxidative corrosion and hydrolytic corrosion, which causes the Filter Bag Cage to lose its acceptable filtration load and lose its filtration performance. This phenomenon is mainly due to the selection of the Filter Bag Cage problems or use the environment beyond the scope of the fiber, resulting in loss of Filter Bag Cage filter performance and failure.

2.2.1 Acid corrosion

High temperature filter is generally the existence of acid corrosion, mainly sulfur oxide. Especially in the coal-fired boiler power plant flue gas dust, the use of high-sulfur coal, and electric bag with the project, the sulfur content of flue gas is high, can reach 5000mg / Nm3. In high temperature environment, sulfur oxides to form sulfurous acid, sulfuric acid, the filter caused by acid corrosion and failure. If the flue gas contains HF, you can not use glass fiber filter, easy acid corrosion caused by filter failure.

General control of flue gas operating temperature above the acid dew point can be, such as below the acid dew point temperature must be closed dust collector system, to avoid corrosion Filter Bag Cage. Acidic liquids are hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid and so on.

2.2.2 Alkali corrosion

Mostly in the sodium and ammonia chemical production process dust, such as sodium chloride, ammonia, sodium carbonate and other conditions. For the power plant, cement plants, waste incineration plant, steel and other areas of the flue gas dust appears less.

2.2.3 Oxidative corrosion

Oxidation and corrosion refers to the existence of a certain amount of oxidizing substances when the damage caused by the filter, mainly for the PPS class of oxidative corrosion, can cause damage to the PPS class of nitrogen oxide oxides, oxygen, ozone, Sulfuric acid and so on. The performance of PPS fiber into a dark and brittle, the appearance of intact, but the sharp decline in strength, only about 200N, close to the end of the life of the filter, loss of filtration.

2.2.4 hydrolysis

Hydrolysis is defined as a chemical reaction that causes water molecules to intervene in the fibers and cause decomposition. Synthetic fibers produced from polycondensation polymers are not resistant to hydrolysis. Including: polyester, polyimide (P84), NOMEX, COMEX.

High temperature, humidity and chemicals, these three factors must exist to activate the hydrolysis. Polyacrylonitrile homopolymer, PPS fiber, PTFE fiber is not produced from polycondensation polymer, often used to replace the hydrolysis of the fiber. Hydrolysis traces are mostly fiber color turbidity, Filter Bag Cage strong drop, hand can easily tear, sewing thread after hydrolysis, no strength.

2.3 high temperature burning

The performance of the high temperature cauterization is mainly due to the high temperature caused by shrinkage severe, severe hardening, and even Filter Bag Cage surface hole, the main reason for the use of Filter Bag Cage conditions in the temperature beyond the bag to withstand the range, resulting in this phenomenon. Specifically for high temperature particles, high temperature flue gas, high temperature heat shrinkage bag caused by excessive damage to the filter.

2.4 condensation obstruction

The so-called condensation, in layman's terms, refers to the wet air in a certain pressure and temperature, precipitation of saturated water phenomenon. The temperature of the precipitation of water is called dew point.

The higher the gas pressure in the saturated state, the lower the dew point. The higher the moisture content in the air, the higher the dew point temperature. When the moisture content in the air is constant, when the temperature of the humidified air is lower than the dew point temperature, the moisture will precipitate in the supersaturated air, that is, the condensation will occur. When the air temperature is higher than the dew point, the moisture will not precipitate Does not produce condensation phenomenon. In addition, if the SO2 content is contained in the flue gas, the SO2 content is higher and the dew point of the flue gas is higher.

As the Filter Bag Cage used in the environment of large moisture, and dust bonded to the surface of the Filter Bag Cage, Filter Bag Cage surface of the microporous plug, resulting in high equipment running resistance, Filter Bag Cage loss of filtration performance. The specific reasons are as follows:

2.4.1 dust leakage phenomenon exists

    Due to the existence of leakage phenomenon of dust collector, the outside of a large number of cold air into the dust collector, the precipitator local air temperature dropped sharply, the air in the water precipitation, resulting in condensation phenomenon.

2.4.2 moisture content in flue gas is too high

    When the treatment of flue gas moisture content is too high, supersaturated water precipitation, resulting in condensation phenomenon. This phenomenon is particularly prominent in the kiln dust collector of the dry line of cement. Since the flue gas in the dry kiln of the cement is usually treated with the humidification tower, the amount of water sprayed is too large, causing the flue gas Water produces condensation when condensation occurs.

2.4.3 Flue gas temperature is too low

Dust can also produce condensation when the temperature of the flue gas itself is close to or below the dew point.

2.4.4 Moisture into the dust collector

As the "four tube burst" phenomenon, leading to water into the dust collector, causing the bag surface condensation, paste bag phenomenon.

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