Bag type dust removal equipment & energy saving and consumption reduction analysis

2020-07-03

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With the progress of industrial productivity, China's ecological and environmental pollution problems are becoming increasingly serious, the national efforts to control environmental pollution have increased, and the investment of enterprises and manufacturers in environmental protection equipment is increasing day by day; if the installation and operation costs of environmental protection equipment remain high, it will continuously increase the production costs of enterprises. Due to the high dust removal efficiency, simple structure, easy maintenance and operation, the efficiency of 99%; efficient dust removal at the same time, the installation cost is significantly lower than the electric dust collector, is widely used in coal-fired power plants, metal smelting, cement and other major heavy industrial enterprises. I would like to talk to you today about the topic of energy saving and consumption reduction of dust removal equipment.

Bag filter equipment in the process of use, energy consumption will continue to increase, how to save energy and reduce consumption in the operation of equipment to reduce the production costs of enterprises more

The key part. According to the composition of the bag type dust removal equipment, summarize, can start from the following three major energy-consuming equipment to achieve energy saving and consumption reduction.

I. Fan system

Fan system is the biggest energy consumption equipment of bag type dust removal equipment. According to the fan motor power formula P=1.732*U*I*COSφ, the motor power loss can be reduced by reducing the motor running current and improving the motor power factor. Changing the motor running current can be achieved by dynamically adjusting the fan speed and fan valve opening according to the load demand.

1）Fan motor using variable frequency control

Frequency converter can be based on the site working conditions of wind demand, rapid response control output, smooth regulation of fan speed, with stable and efficient energy-saving effect, but the frequency conversion equipment is expensive, electrical equipment installation requires special sites and a good operating environment, post-maintenance and spare parts cost is high, generally according to the input cost and the energy-saving effect produced later compared to choose to use.

(2) fan using hydraulic coupling speed control

Hydraulic coupling once the input cost is lower than the inverter, the later maintenance costs are lower, but the speed response speed is lower, mechanical parts can not be frequent speed regulation, otherwise it is easy to cause damage to the hydraulic coupling speed control parts, not suitable for use in the case of frequent changes in working conditions. Energy-saving effect is not as good as variable frequency speed regulation.

3）Adjustment of fan valve opening control

Through the site working conditions demand, can manually adjust the fan inlet valve opening to reduce the fan load, to reduce motor load loss, but the valve adjustment, will produce turbulence caused by fan wheezing, equipment vibration increased, the fan shell for a long time by the airflow friction heating heating and other adverse effects, and energy-saving efficiency is low, less use this way to save energy and reduce consumption.

(4) Increase the power capacitor compensation equipment

By adding power capacitor compensation equipment for power equipment in the distribution room, the power factor of the motor is increased, thus improving the efficiency of the motor. This way has low input cost and good energy-saving effect for long-cycle low-efficiency operation equipment. In summary, according to the actual use of the selection of appropriate energy-saving methods, you can greatly save energy and reduce consumption, and effectively reduce operating costs. Ltd. dust collector equipment, there are a few use of variable frequency speed control and hydraulic coupling speed control, but because the site working conditions of the basic full load operation, so the dust collector equipment speed range is not large, hydraulic coupling speed control is mainly used in the converter and iron de-dusting fan, the basic role of speed control as the start-up, will occasionally speed control according to the site conditions, did not achieve good energy-saving effect There is a lot of room for improvement in energy saving and consumption reduction.

二、the ash cleaning system

Bag type dust cleaning system is mainly composed of air storage tank, compressed air pipeline, split air bag, pulse valve, cloth bag and so on.

The main working principle is to generate power through the fan to bring the dust particles on site, through the pipeline into the dust collector lower box, large particles of dust into the large space, under its own gravity, fall to the ash bin, fine dust is blocked by the cloth bag, filtered clean air through the clean room, through the chimney emissions to the atmosphere. When more and more dust, dust collector up and down the box to produce more and more resistance, when a certain resistance, you need to pulse valve control compressed air for blowing dust, restore the normal resistance to meet the working conditions. At present, there are two main control methods of ash cleaning system: regular ash cleaning and differential pressure ash cleaning.

Periodic dust cleaning is based on the size of the dust volume on site, in the central control set the blowing interval and cycle time, week after week for regular dust cleaning. According to the actual working conditions and dust nature of the site set the appropriate blowing interval and cycle time, can improve the efficiency of dust cleaning, thereby reducing the amount of compressed air loss. This type of dust cleaning is suitable for stable working conditions and stable dust quantity.

Differential pressure cleaning is based on the detection of the pressure difference between the entrance and exit of the dust collector, when the differential pressure reaches a high value (generally set to 1500Pa), the program automatically starts the dust cleaning system for blowing, and when the differential pressure drops below the set low value (generally set to 1000Pa), dust cleaning automatically stops. This dust cleaning method can make the compressed air reach the optimal state, but need accurate pressure detection value, detection pressure pipeline without frequent blockage of the use of the case, the need to regularly check whether the pressure detection equipment is normal, to prevent inaccurate pressure detection, long-term non-cleaning of dust caused by bag bonding.

Our Zhanjiang Zhongyue environmental protection dust removal equipment combines two dust cleaning methods, after program improvement, using a combination of regular and differential pressure linkage dust cleaning method for dust cleaning: according to the site working conditions to dust cleaning cycle time set to a longer cycle time, when the pressure detection is abnormal, a long period of time without dust cleaning, the system will be based on the set cycle dust cleaning, to ensure that the bag will not be bonded due to a long period of time without dust cleaning.

By optimizing the ash cleaning control system, the useless loss of compressed air can be reduced, so as to achieve the purpose of energy saving and consumption reduction.

三、Ash transfer system

The ash conveying system of bag type dust removal equipment generally consists of ash hopper vibrator, ash discharge valve, scraper conveyor, bucket elevator or pneumatic ash conveying equipment. As the ash cleaning system of bag type dust collector is working intermittently, only when the ash cleaning system is working, the ash hopper will drop a large amount of ash, and the dropped ash needs to be transported to the external ash storage bin in time by scraper conveyor, bucket elevator or pneumatic ash conveying, so as to avoid the normal operation of the dust collector due to excessive ash accumulation in the dust hopper, and in serious cases, the dust collector may be crushed due to excessive ash accumulation. The traditional ash conveying system runs uninterruptedly for a long time, which will cause the ash conveying system equipment to idle without ash in the ash hopper, wasting electricity and causing the scraper chain and rail to dry wear, greatly shortening the service life of the ash conveying equipment, increasing the cost of spare parts and equipment maintenance costs.

Through long-term observation and practice, we design and modify the program according to the ash discharge valve and scraper's ash conveying capacity, and realize two ways to improve the efficiency of ash conveying system equipment, so as to achieve the effect of energy saving and consumption reduction.

The first way: design and modify the program and control screen, add the function of periodical automatic start/stop operation of the ash conveying system, add the starting delay time, stopping delay time, ash discharging valve running time, ash discharging valve intermittent time, ash discharging valve periodical intermittent time control parameter setting box on the screen, you can set the ash conveying system running time according to the amount of ash on site, so that the equipment can run in a high efficiency working condition. This allows the equipment to operate at a high efficiency and reduces the energy consumption of the dust removal and ash conveying system to a greater extent.

The second way: using the hopper level meter level detection function, when half of the bin low level meter detects the low level signal, automatically start the ash conveying system to discharge ash, when running for a period of time, the low level signal all disappear, the ash conveying system stop. This way can better improve the efficiency of the equipment and maximize the energy saving and consumption reduction. However, this program has not yet been applied in practice, pending implementation.

In today's rapid economic development, the pursuit of efficiency first, but also pay more and more attention to the protection of the environment, a large number of environmental protection equipment is put into use, only through a variety of ways to continuously improve the use of equipment efficiency, in order to more effective energy saving and reduce the cost of production and operation of enterprises.

Finally, I would like to say to all the guests: energy saving and consumption reduction is the basic requirement for all energy-consuming equipment. Baghouse dust collector as high energy consumption environmental protection equipment, should start from the design of the equipment to do perfect, both environmental protection and energy saving. Start from analyzing the resistance of baghouse dust collector, and do detailed work in three aspects of fan system, dust cleaning system and ash conveying system. It is sure to effectively reduce the operating resistance of the bag filter, so that it can play a greater efficiency under the premise of energy saving.

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