How to carry out the case of the dust collector not meeting the standard transformation pulse bag fi

1) The dust at the corner of the belt conveyor is restricted by the site conditions, and the chute and dust removal cover cannot be changed, so that the dust removal cover is in a state of slight negative pressure to eliminate the dust of the belt conveyor.

2) According to the service life of the filter material and the pulse valve, and the dust at the ash hopper falling place, in order to improve the comprehensive dust removal effect of the crusher and belt conveyor, when crushing dry materials, water can be appropriately sprayed at the material inlet of the crusher according to the needs (it is required to be carried out after opening the crusher for 10 20min).

3) Strengthen the management of dust removal equipment, regularly check the sealing of the dust removal hood, and deal with problems in time. Implement target management assessment for the post environment and dust emission of bag filters, conduct regular dust monitoring, use economic levers to mobilize the enthusiasm of post personnel, improve the maintenance level of dust removal equipment, and minimize dust pollution.

4) Update the bag filter at the corner of the crusher and belt conveyor to PPC64-4 and PPC bag filter respectively. According to the characteristics of dust, water-repellent and oil-repellent filter material is used. The PPC bag filter is arranged in the open air, and its shell is insulated and waterproofed.

In order to ensure the reliable operation of the equipment, the brand and specification model should be paid attention to when purchasing the key accessories of the baghouse to reduce the failure rate of the equipment. Technical performance and technical parameters of crusher bag filter: PPC type, DMC type, PPC64-4 type, PPC type, air volume (m3 h), 24000 390003500180003000 filtration area, number of filter bags, 1052025660 filtration, wind speed (m min), resistance: PA1177<1200<1400, ash cleaning mode, pulse pulse, air box pulse, number of air box pulse chambers, 4144

5) Improve the process layout of the bag pulse dust collector, and arrange the dust collector of the stone crusher according to the direction of the belt conveyor; The standard ash hopper of the bag filter is transformed into a double ash hopper structure, which cancels one screw conveyor and raises the bag filter, which is conducive to the arrangement of the air inlet pipe (the angle of the air duct is large); The air inlet box is set at the air inlet, so that the dust from the crusher discharge port directly enters the air inlet box of the dust collector, which saves the elbow, reduces the system resistance, and improves the dust collection efficiency. The process arrangement of the ash hopper to lock the air adopts a single-layer flap valve, which cancels the grid wheel feeder and its motor, reduces the secondary dust, and improves the dust removal effect.

The dust collector transformation of Hubei Jingtian has done a good job, and there are successful safety examples of dust collector transformation.

The dust collector is not up to standard transformation:

First of all, analyze the reasons for exceeding the standard, to see whether the particulate matter exceeds the standard, or the VOC exceeds the standard, and the amount of excess is the standard.

Secondly, look at how effective and reasonable the equipment can be transformed.

Finally, the comprehensive plan is reasonable under the premise of reducing investment and future operating costs.

The case is as follows: <>

I'm engaged in electrical appliances and the electrical problem is the pulse valve, the poppet valve controls the intermediate relay. Solenoid valve coil loves to burn. This is all controlled by a PLC module.

Judging the quality of the relay, the channel of the PLC module is generally shorted with the PLC power supply live wire. Check whether the relay operates and whether the auxiliary contact has voltage output. As for the quality of the solenoid valve coil, just measure it at the terminal.

The neutral line is a common line. When checking, measure the quality of the solenoid valve coil, if there is a short circuit, you can't short connect the PLC module, otherwise it will burn the channel. There is also the fact that the working air pressure of the pulse bag filter is not enough.

Pulse valves, poppet valves, damaged valve bodies or damaged diaphragms in the valves.

Generally speaking, the dust removal efficiency of a pulse baghouse depends on the filter media you choose and the characteristics of the dust you want to treat.

When the dust attached to the dust filter bag reaches about 2 3g m2, the dust removal efficiency of the pulse bag filter can exceed 90%; When it reaches 150g m2, it can exceed 99% (according to the common dust concentration, the former takes about 1min, and the latter takes about 1h).

After the dust removal filter bag is cleaned, there is still some dust left, and after a period of periodic filtration and cleaning, the residual dust tends to be stable. At this time, the dust collection rate will generally remain greater than 99%, and if used properly, its dust collection efficiency can be exceeded.

Pulse baghouse.

The dust removal efficiency is high, generally up to 99%, and it can capture fine dust particles with a particle size greater than microns, which meets strict environmental protection requirements.

The application of bag filter in our life can be applied to many industries, which is why bag filter can be widely used. The pulse bag filter should pay attention to the daily maintenance to ensure its normal operation and dust removal efficiency, and the maintenance method of the pulse bag filter is as follows:

1) Front-line personnel should be familiar with the performance, principle and use of the bag filter, and master the maintenance and adjustment methods.

3) Pulse bag dust collector, ash conveying device, reducer and other mechanical moving parts should be oiled and changed according to the regulations, and abnormal phenomena should be eliminated in time.

4) If the diaphragm of the pulse valve is damaged, it should be replaced in time. If there is a fault, it should be checked in time, and there is moisture and impurities inside, which should be cleaned.

5) Regularly measure the process parameters, such as flue gas volume, concentration, temperature, etc., and find problems, the cause should be found in time and the timing pulse controller should be dealt with, and the cleaning cycle should be determined regularly to see if it is accurate, otherwise it should be adjusted.

6) When using a constant resistance pulse controller, the working condition of the pressure switch should be checked regularly, whether the pressure measuring port is blocked, and cleaned.

7) When the machine is turned on, the compressed air should be connected to the air storage tank first, the control power supply should be turned on, and the ash discharge device should be turned on.

8) When stopping, after the process system is stopped, the bag filter and the induced draft fan should be kept to continue to work for a while, so as to remove the moisture and dust in the equipment, it should be noted that when the bag filter stops working, the dust collector must be repeatedly cleaned (with manual cleaning to know whether there is dust), and the dust on the dust filter bag should be removed to prevent the bag from being affected by moisture.

9) When stopping, it is not necessary to cut off the air source of the air compressor, especially when the fan is working, compressed air must be supplied to the poppet cylinder to achieve the open state of the poppet valve.

10) The bag filter should not stop working when it is working, otherwise, the ash hopper will soon be filled with dust and overflow into the bag room, forcing the bag filter to stop working.

Pulse bag filter is widely used in life, and we must pay attention to the above aspects when using. In this way, the life of the bag filter can be extended and its normal operation can be prolonged.

How to accurately calculate the filtration area of a bag filter? This is a prerequisite for selecting a baghouse model.

1. Calculation method of the total filtration area of the bag.

Based on the total amount of dust passing through the collector and the predetermined filtration air velocity, the total filtration area is calculated according to the following formula.

2. The area of a single dust removal filter bag.

In the process of dust removal bag processing, because the filter bag should be fixed on the flower plate or short pipe, and some should be hung up and fixed on the cap, so the two ends of the filter bag need to be sewn in double or even multi-layer sewing: this part of the double layer sewing has no filtering effect due to the increase in resistance, and at the same time, there is no filtering effect in the middle of the filter bag. In the large and medium-sized reverse air dust collector, the filter bag is 10m long and diameter, and its nominal filtration area is; If the area without filtration is deducted, its net filtration area is determined by.

It can be seen that the useless filter area of the bag accounts for 5% 10% of the filter bag area, so the size of the net filter area should be indicated in the specifications of large and medium dust collectors. However, in the existing dust collector samples, the filtration area mostly refers to the nominal filtration area, and attention should be paid to in the design and selection.

3. The number of filter bags.

After finding the total filtration area and the area of a single dust bag, the number of filter bags can be calculated. If the number of filter bags per bag chamber is determined, the number of chambers for the entire collector can also be calculated. Although the number of rooms is determined according to the needs in the design or selection of the dust collector, the number of rooms of the dust collector with more than 8 rooms is often double-row for the consideration of site layout and maintenance convenience.

Dust collectors with less than 6 chambers are classified as single rows.

4. Resistance calculation.

The resistance of a baghouse is composed of three parts: aThe resistance of the equipment structure refers to the resistance generated by the gas from the inlet of the dust collector to the outlet of the dust collector; b.

The resistance of the filter bag refers to the resistance of the filter material, which is about 50 150pa; c.The resistance of the dust layer on the surface of the filter bag is about 7 10 times that of the clean filter bag. The structural resistance of the dust collector body increases with the increase of the filter air speed, and the resistance of the baghouse dust collector of different sizes and categories is different, so it is difficult to calculate it in a certain expression.

The general filtration wind speed is time, and the body resistance is roughly between 50 and 500pa.

There are many types of bag filters, therefore, its selection calculation is particularly important, improper selection, such as the equipment is too large, will cause unnecessary flow costs; The selection of small equipment will affect production and it is difficult to meet environmental protection requirements.

Generally speaking, the basic process parameters of the powder should be known before calculation, such as the flow, properties, concentration of dust-containing gas, and the dispersion, wettability, viscosity and so on of the dust. After knowing these parameters, the equipment model is selected by calculating the filtration wind speed, filtration area, filter material and equipment resistance.