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Pipe in pipe pneumatic ash conveying system

key word:Heat exchange element


Product description

Pipe in pipe pneumatic ash conveying system

 

1. Introduction

1.1. Purpose

Pipe in pipe pneumatic ash conveying technology is mainly used in dry treatment of fly ash in coal-fired power plant, and widely used in the concentration and transportation of powdery materials in cement, metallurgy, chemical industry and other industries

1.2. Working principle

The system uses compressed air as the power, and the group of down drawing bin pumps as the core equipment, so that the powder materials flow in the pipeline in the form of fluid, so as to achieve the ideal low conveying speed, high ash gas ratio and high conveying capacity.

 

2. Main features

2.1. The unique double pipe (pipe in pipe) transmission pipeline has the function of self stabilization and adjustment, so the pipe will not be blocked due to system reasons. Even if the air source system fails, the system can run smoothly as long as the (standby) air compressor is restarted, which makes the system more safe and reliable.

2.2. Higher average ash gas ratio, continuous pipeline transportation and higher utilization rate of air compressor make the system energy consumption low and efficiency high (under the same working conditions, the average ash air ratio of other suspension conveying systems is 20% - 40% higher than that of other suspension conveying systems; the farther the conveying distance is, the greater the difference of ash gas ratio is).

2.3. The non clogging feature of double pipe (pipe in pipe) dense phase conveying system makes it more suitable for pneumatic conveying of large particles and high specific gravity materials than any other system. At present, the double casing (pipe in pipe) system allows a small amount of material with particle size of 20 mm to be transported together with powder material, In practice, according to the characteristics of double casing pipe (pipe in pipe), the position of inner pipe is shifted downward, which is beneficial to achieve better turbulence effect and reduce wear and tear.

2.4. Because the double pipe (pipe in pipe) can automatically blow and block, the pressure change in the pipeline is small during ash transportation, and the system operation condition is relatively stable, so it is conducive to improve the conveying concentration and long-distance transportation. Compared with the conventional pneumatic ash conveying system, the energy saving is about 30%. The lower conveying velocity (starting speed is 4-6m / s, final speed is generally 10-14m / s), which greatly reduces the wear rate of materials on the equipment, reduces the daily maintenance workload and maintenance costs, and prolongs the service life of the equipment. Ordinary steel pipe can be selected as the conveying pipeline, and the system can be operated continuously. Under normal conditions, the electrostatic precipitator does not accumulate ash, and the fly ash is stored in the sending tank to prevent the ash accumulation and arching of the ash hopper of the electrostatic precipitator, and correspondingly improve the efficiency of the electrostatic precipitator. At the same time, the next cycle can be carried out without blowing out the materials in the ash pipe So as to improve the utilization rate of air compressor and save energy.

2.5. Because the double sleeve (pipe in pipe) has the function of automatic blowing and plugging, it can reduce the final velocity of ash flow in the conveying pipe and the filtering area of bag filter, simplify the system and reduce the investment. The conveying system adopts PLC + PC control mode, with high automation level and few operators.

2.6. A settling box (discharge TEE) is set under each sending tank. When there are bolts, nuts and other metal foreign matters in the fly ash, they will settle in the settling box after falling into the sending tank, so it can avoid the metal foreign matters being transported to the ash silo and damaging the gasification plate at the bottom of the silo. The discharge tee is equipped with a hand hole, and the user only needs to remove it manually on a regular basis.

2.7. The air supply system is equipped with pressure reducing and throttling devices, which can effectively control the air flow into the system and make it operate orderly within the set pressure and flow range. At the same time, it can also prevent the air compressor from losing pressure in a short period of time and greatly fluctuating the pressure, so as to protect the safety of the gas supply system.

2.8. One pressure relief device is set on each main conveying pipe to remove the residual pressure of the system, which can effectively reduce the wear of the ventilation pipeline.

See Fig. 15-1 for equipment of pneumatic ash conveying system in pipe.