CN102152971A

CN102152971A - Rational positive-pressure pneumatic pressure ash handling system

Info

Publication number: CN102152971A
Application number: CN 201110057504
Authority: CN
Inventors: 孙家鼎
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-03-10
Filing date: 2011-03-10
Publication date: 2011-08-17

Abstract

The invention relates to a rational positive-pressure pneumatic pressure ash handling system in a coal fired power plant. A positive-pressure concentrated-phase pneumatic pressure ash handling systems commonly adopted by the coal fired power plant currently implement discontinuous powder transmitting and conveying by taking a bilge pump as a secondary storage container; while a concentrated rational positive-pressure pneumatic pressure ash handling system uses an electronic baffle door, a solid powder flow monitor, and a mixed pipe to replace the bilge pump, a charge valve, and a discharge valve, and change discontinuous ash conveying into rational positive-pressure pneumatic pressure ash handling system so as to overcome the defect that a discontinuous ash handling system can possibly threaten the safety running of an electric dust catcher due to insufficient conveying power. The rational positive-pressure pneumatic pressure ash handling system not only can improve the ash conveying capacity of the system, but also can monitor the flow state and ash/air ratio of the conveyed ash; moreover, relevant accessories and devices such as the bilge pump, the charge valve, and the discharge valve, and the like can be saved, and the quantity of ash conveying pipelines is reduced.

Description

Quantitative malleation pneumatic ash removal system

Technical field

The present invention relates to the quantitative malleation pneumatic ash removal system of a kind of coal-burning power plant fly ash.

Technical background

But the fly ash comprehensive application that the coal-burning power plant produces needs ash transfer standby to the grey storehouse of storage.Because operational throughput is big and distance, needs bigger delivery pressure and just can finish the conveying task.The malleation concentrated phase pneumatic ash removal system of large coal-fired power plant generally adopts imported technology.Reality in conjunction with China; the ature of coal that the coal-burning power plant uses is changeable; ash content increases considerably and requires to carry the super large of exerting oneself; malleation concentrated phase Pneumatic ash conveying system is difficult to adapt to; take place to carry latch up phenomenon and electrostatic precipitator storage ash bucket inner product press-powder coal ash to make the powder position reach dangerous high charge level through regular meeting; seriously threaten the safe operation of power plant; the storage ash bucket that is forced under the electrostatic precipitator is promptly put ash on the spot; cause gross pollution or reduce the generator set load; to sacrifice economy is that cost exchanges safe operation for, these phenomenons developed into leave no choice but to solve can not stage.For this reason, quantitative malleation pneumatic ash removal system can be changed into the defeated grey mode of the discontinuous concentrated phase that with the storehouse pump is main transport box the quantitative malleation ash disposal system of no storehouse pump receptacle, has thoroughly overcome the various drawbacks of being brought by the malleation concentrated phase pneumatic ash removal system of external introduction.

Summary of the invention

The objective of the invention is: with the coal-burning power plant is to carry out the transmission and conveying powder of discontinuous as the secondary reservoir vessel with the storehouse pump in the malleation concentrated phase pneumatic ash removal system that generally adopts still at present, and quantitative malleation pneumatic ash removal system cancellation storehouse pump and charging and discharging valve, replace it with electronic baffle door, solid powder flow monitoring device and mixer, change into quantitative malleation pneumatic ash removal system, to overcome that the discontinuous ash disposal system might occur carrying undercapacity and the safety and economic operation that threatens electric dust collector.Quantitative malleation pneumatic ash removal system not only can improve the defeated grey ability of ash disposal system and can monitor defeated grey flow regime and ash/gas ratio, also can save storehouse pump and charging and discharging valve thereof and relevant annex and equipment thereof, reduces the quantity of ash conveying pipe.

The present invention solves the technical scheme that is adopted that has problems in the ash transfer: simplify pneumatic ash removal system, electronic baffle door and solid powder flow monitoring device string are contained on the ash tube of electrostatic precipitator storage ash bucket, at mixing tube and ash conveying pipe intersection jet pipe is housed, pressurized air produces by jet pipe inhales the volume effect, and the fly ash that process is measured is introduced into ash pipeline and is delivered to the grey storehouse of storage.

Description of drawings

Be described further below in conjunction with drawings and Examples.

Accompanying drawing is the formation of quantitative malleation pneumatic ash removal system:

1. 3. maintenance of storage ash bucket 2. level-sensing devices constitute quantitative malleation pneumatic ash removal system with insertion plate door 4. electronic baffle door 5. solid powder flow monitoring devices 6. gas equalizing pipes 7. ash tubes 8. jet pipes 9. mixing tubes 10. oblique cutting pipes 11. flow counter 12. forcing pipes 13. ash pipelines 14. air intake valves.

The specific embodiment

In the accompanying drawing, the position, middle and lower part of storage ash bucket (1) sidewall is provided with level-sensing device (2), storage ash bucket end opening is equipped with maintenance insertion plate door (3), be equipped with electronic baffle door (4) and solid powder flow monitoring device (5) under it, ash tube (7) connects with mixing tube (9), oblique cutting pipe (10) is equipped with in the mixing tube lower end, when the fly ash that the electric dust exhaustor is collected can detect the ash position at level-sensing device (2), suitable angle is just opened and adjusted to electronic baffle door (4) automatically, make the fly ash that passes through through solid powder flow monitoring device (5), record the instant flow rate value and be maximum quantitatively concentrated phase operational throughput, when the maximum quantitatively concentrated phase operational throughput of the storage powder quantity not sufficient supply under level-sensing device of storage ash bucket, electronic baffle door (4) SELF CL, air intake valve (14) on the while closes compression air pipe is to save compressed air consumption, when level-sensing device (2) detects the ash position of fly ash once more, automatically suitable open angle is opened and returned to electronic baffle door (4) again, repeat above operation.When the powder position of storage ash bucket is in dynamic powder position below the level-sensing device and carries, make transportation work always remain on the operation continuously down of maximum defeated ash amount concentrated phase state, only can not satisfy the maximum quantitatively situation of concentrated phase operational throughput and just stop the supple of gas or steam to suspend and carry when dynamic powder position is in, the dynamic powder position of waiting to store up ash bucket runs up to material level and begins to carry by the maximum delivery concentrated phase when showing again, dangerous high charge level will not appear in the storage ash bucket, guarantees that ash disposal system can be in operation under the energy-saving safe state.At gas equalizing pipe (7) and storage ash bucket (1), electronic baffle door (4) and solid powder flow monitoring device (5) the maintenance air pressure balance that is interconnected, fly ash is after discharge measurement, fall into the mixing tube (9) that has jet pipe (8) by ash tube (7), jet pipe can produce swabbing action, make fly ash fall into mixing tube, compressed air is sent into ash conveying pipe, can be controlled in the scope of concentrated phase conveying by ash (kg)/gas (kg) ratio, fly ash and compressed-air actuated compound enter ash pipeline (14) through oblique cutting pipe diffusion, ash pipeline is provided with forcing pipe (12), can adjust air intake valve (14) tonifying Qi according to the situation of ash transfer, the powder that each storage ash bucket sends can be together in series by ash pipeline and directly be delivered to the grey storehouse of storage.In a single day ash pipeline has clogging phenomenon to take place, and it is stifled to carry out blowback automatically by gas equalizing pipe (6), can recover normal conveying automatically behind the pipe-dredging.

Carry fly ash continuouslyly and unobstructedly, can reduce the heat dissipation of fly ash, make fly ash maintain higher temperature, the viscosity of high temperature fly ash is low, the good fluidity of fly ash, thereby be difficult for blockage phenomenon.The defeated ash load of the ash disposal system of original discountinuity is big, causes electrostatic precipitator storage ash bucket to overstock fly ash easily material level is raise, and forces until high charge level and promptly puts ash or reduce unit load.And improved continuity is carried, and has disperseed concentrated force, thereby phenomenon can not take place to overstock.Even if the increase at double of quality decline ash content, defeated grey ability also can satisfy, and the storage ash bucket can not produce high charge level and promptly put grey phenomenon, ensures that ash-transmission system can be in the state smooth operation of energy-saving safe.

Claims

1. the quantitative malleation pneumatic ash removal system of coal-burning power plant's fly ash is by the middle part of storage ash bucket (1) sidewall level-sensing device (2) to be housed, storage ash bucket end opening is equipped with maintenance insertion plate door (3), be equipped with electronic baffle door (4) and solid powder flow monitoring device (5) under it, ash tube (7) connects with mixing tube (9), fall into the mixing tube (9) that has jet pipe (8) by ash tube (7), oblique cutting pipe (10) is equipped with in the mixing tube lower end, fly ash enters ash pipeline (13) through oblique cutting pipe diffusion, ash pipeline is provided with forcing pipe (12), can adjust air intake valve (14) tonifying Qi according to the situation of ash transfer, gas equalizing pipe (6) and storage ash bucket (1), the gas equalizing pipe (6) that is interconnected is arranged between electronic baffle door (4) and the solid powder flow monitoring device (5), and it is stifled to carry out blowback automatically by the gas equalizing pipe.

2. according to claim 1, electronic baffle door (4) and solid powder flow monitoring device (5) can be monitored the ash transfer amount.Jet pipe (8) is equipped with in mixing tube (9) upper end that tilting is installed, and pressurized air penetrates through jet pipe can aspirate fly ash, brings ash into ash conveying pipe and carries.