CN102145814A

CN102145814A - Safe energy-saving pneumatic ash removal system

Info

Publication number: CN102145814A
Application number: CN2011100248126A
Authority: CN
Inventors: 孙家鼎
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-01-24
Filing date: 2011-01-24
Publication date: 2011-08-10

Abstract

The invention relates to a safe energy-saving pneumatic ash removal system for a coal fired power plant. At present, a positive pressure concentrated phase pneumatic ash removal system which is still commonly used in the coal fired power plant is a system which can be used for discontinuously transmitting and conveying powder by using a cabin pump as a secondary storage container; however, the cabin pump, a feeding valve and a discharging valve are eliminated, and an electric baffle plate door, a flow monitoring type check valve device and a hybrid tube are used in the safe energy-saving concentrated phase pneumatic ash removal system instead of the cabin pump, the feeding valve and the discharging valve to change a discontinuous ash conveying system into a continuous concentrated phase pneumatic ash removal system, so that the problem that the safe operation of an electric dust remover is influenced because insufficient conveying capacity can occur in a discontinuous ash removal system is solved. By the safe energy-saving pneumatic ash removal system, the ash conveying capacity of the system can be improved, the flow state and the ash-to-air ratio of conveyed ash can be monitored, the cabin pump and accessories and equipment which are related to the feeding valve, the discharging valve and the like of the cabin pump are eliminated, and the quantity of ash conveying pipelines can be reduced.

Description

The safety and energy-saving pneumatic ash removal system

Technical field

The present invention relates to the safety and energy-saving 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; and cause gross pollution, these phenomenons to develop into to leave no choice but solve can not stage.For this reason, the safety and energy-saving 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 continous way concentrated phase ash-transmission 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 safety and energy-saving pneumatic ash removal system cancellation storehouse pump and charging and discharging valve, replace it with electronic baffle door, flow monitoring type non-return flap apparatus and mixer, change into continous way concentrated phase safety and energy-saving pneumatic ash removal system, to overcome that the discontinuous ash disposal system might occur carrying undercapacity and the safe operation that threatens electric dust collector.The safety and energy-saving pneumatic ash removal system not only can improve the defeated grey ability of system and can monitor defeated grey flow regime and ash/gas ratio, also can save relevant annex and equipment such as storehouse pump and charging and discharging valve 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 flow monitoring type non-return flap apparatus 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 negative pressure by jet pipe, and the fly ash that process is measured enters 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 safety and energy-saving pneumatic ash removal system:

1. 4. maintenance of 3. times level-sensing devices of level-sensing device constitute the safety and energy-saving pneumatic ash removal system with insertion plate door 5. electronic baffle door 6. flow monitoring type non-return flap apparatus 7. gas equalizing pipes 8. ash tubes 9. jet pipes 10. mixing tubes 11. oblique cutting pipes 12. flow counter 13. forcing pipes 14. ash pipelines 15. air intake valves on the storage ash bucket 2..

The specific embodiment

In the accompanying drawing, the position, middle and lower part of storage ash bucket (1) sidewall is equipped with level-sensing device (2) and following level-sensing device (3) respectively, storage ash bucket end opening is equipped with maintenance insertion plate door (4), be equipped with electronic baffle door (5) and flow monitoring type non-return flap apparatus (6) under it, ash tube (8) connects with mixing tube (10), diffuser pipe (11) 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 last level-sensing device (2), suitable angle is just opened and adjusted to electronic baffle door (5) automatically, make the fly ash that passes through through flow monitoring type non-return flap apparatus (6), recording the instant flow rate value is the concentrated phase operational throughput, when the powder position of storage ash bucket is in material level timing down, electronic baffle door (5) SELF CL, air intake valve (15) on the while closes compression air pipe is to save compressed air consumption, when last level-sensing device (2) detects the ash position of fly ash once more, again suitable angle is opened and adjusted to electronic baffle door (5), repeat above operation.Dynamic powder position when the powder position of storage ash bucket is between the upper and lower level-sensing device, make transportation work always remain on the operation continuously down of maximum defeated ash amount concentrated phase state, only, dynamic powder position suspends conveying when being in the situation of level-sensing device just to stop the supple of gas or steam, the dynamic powder position of waiting to store up ash bucket runs up to the material level timing and begins to carry by the maximum delivery concentrated phase 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 (5) and flow monitoring type non-return flap apparatus (6) the maintenance air pressure balance that is interconnected, fly ash is after discharge measurement, fall into the mixing tube (10) that has jet pipe (9) by ash tube (8), (12) Give go into a certain amount of pressurized air to jet pipe (9) by the compressed air require meter, ash (kg)/gas (kg) ratio is controlled in the scope of concentrated phase conveying, fly ash and compressed-air actuated compound enter ash pipeline (14) through diffuser pipe (11), ash pipeline is provided with forcing pipe (13), whether can adjust air intake valve (15) according to the situation of ash transfer enables, 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 (7), 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.And improved continuity is carried, and has disperseed concentrated force, and transporting resistance is little, 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 safety and energy-saving pneumatic ash removal system of coal-burning power plant's fly ash is by the position, middle and lower part of storage ash bucket (1) sidewall level-sensing device (2) and following level-sensing device (3) to be housed respectively, storage ash bucket end opening is equipped with maintenance insertion plate door (4), be equipped with electronic baffle door (5) and flow monitoring type non-return flap apparatus (6) under it, ash tube (8) connects with mixing tube (10), fall into the mixing tube (10) that has jet pipe (9) by ash tube (8), diffuser pipe (11) is equipped with in the mixing tube lower end, fly ash enters ash pipeline (14) through diffuser pipe (11), ash pipeline is provided with forcing pipe (13), can adjust air intake valve (15) according to the situation of ash transfer, gas equalizing pipe (7) and storage ash bucket (1), the gas equalizing pipe (7) that is interconnected is arranged between electronic baffle door (5) and the flow monitoring type non-return flap apparatus (6), and it is stifled to carry out blowback automatically by gas equalizing pipe (7).

2. according to claim 1, electronic baffle door (5) and flow monitoring type non-return flap apparatus (6) can be monitored the ash transfer amount.Jet pipe (9) is equipped with in mixing tube (10) upper end that tilting is installed, and can cause compressed-air actuated negative pressure in the exit.