CN101357299A - Desulfurization reaction tower of circulating fluid bed - Google Patents

Desulfurization reaction tower of circulating fluid bed Download PDF

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Publication number
CN101357299A
CN101357299A CNA2007100167620A CN200710016762A CN101357299A CN 101357299 A CN101357299 A CN 101357299A CN A2007100167620 A CNA2007100167620 A CN A2007100167620A CN 200710016762 A CN200710016762 A CN 200710016762A CN 101357299 A CN101357299 A CN 101357299A
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China
Prior art keywords
tower
reaction tower
flue gas
flow
duster
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Pending
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CNA2007100167620A
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Chinese (zh)
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黄盛珠
朱琳
聂江宁
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黄盛珠
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Priority to CNA2007100167620A priority Critical patent/CN101357299A/en
Publication of CN101357299A publication Critical patent/CN101357299A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a circulating fluidized bed desulfurization reaction tower with an impact-flow pre-dust collector. The reaction tower comprises a tower body, a flue gas outlet pipe connected with the upper part of the tower body, a powder blowing tube and a water spray pipe connected with the lower part of the tower body and a venturi pipe section connected with the lower end of the tower body. The reaction tower is characterized in that the other end of the venturi pipe section is connected with the impact-flow pre-dust collector, the bottom of the impact-flow pre-dust collector is a conical ash-falling opening, and a horizontal flue gas inlet pipe is arranged at the middle part of the impact-flow pre-dust collector. The reaction tower has the following advantages: 1. pre-separation of fly ash is realized, therefore, the usual electrostatic dust collector which occupies large area and is adopted as a pre-separator can be cancelled, therefore, the desulfurization device is characterized by small occupancy area, compact arrangement, low production cost, and the like; 2. the air current in the desulfurization tower can be guaranteed to be evenly distributed under any boiler load; 3. the impact-flow pre-dust collector has excellent performance, and can ensure over 85% dust collection efficiency and less than 500Pa resistance loss when the ratio range of the water injection volume and the dust content of the flue gas is 0.1-0.5kg/kg; and 4. the water injected into the hot flue gas for humidification can be taken as the humidifying water required by the desulfurization device, therefore, water is not wasted.

Description

Desulfurization reaction tower of circulating fluid bed
Technical field:
The invention belongs to industrial waste gas purifying environmental protection and chemical field, particularly a kind of desulfurization reaction tower of circulating fluid bed with the percussion flow pre-duster.
Background technology:
Reaction tower in the desulfurizer is generally the cylindrical-shaped tower that adopts the Venturi tube fluidisation, and hot flue gas enters from the tower bottom side.The tower body of traditional structure can cause the serious deflection in flow field, not only reduces desulfuration efficiency, also can cause sticking wall scale formation.According to Environment Protect in China industry standard HJ/T 178 2005 " the flue gas circulating fluidized bed method of flue gas desulphurization engineering legislation "; desulfurizer can comprise the primary dust removing device (preseparator) along flue gas flow; desulfurizing tower; separator and secondary ash collector; according to the quality heat EQUILIBRIUM CALCULATION FOR PROCESS of desulphurization system as can be known; the efficiency of dust collection of primary dust removing device is high more; can make that unreacted absorbent contents is big more in the desulfurization ash of separator under removing; therefore; under identical tower endoparticle concentration and circulating ratio; reaction zone calcium sulfur ratio actual in the desulfurizing tower increases, and desulfuration efficiency improves.Traditional way is the electrostatic precipitator of arranging an electric field, and efficiency of dust collection generally reaches 85%, satisfies service requirement substantially.But for the desulfurization improvement project of old unit, often the place anxiety is not suitable for arranging that electrostatic precipitator is as the primary dust removing device.
In order to overcome above-mentioned deficiency, Tsing-Hua University has invented a kind of " reaction tower for stack gas desulfurization of dry type circulating fluid bed ", the patent No. is 200420121010.2, it comprises tower body and the gas approach that is connected with tower body, the exhanst gas outlet and the import of dusting, feature is described tower body by two forming and adorn its two sections connections by the set civilian mound period up and down, the hypomere of tower body has been the pre-separation chamber of cushioning effect, pre-separation chamber and the described type of attachment of advancing mouth adopt tangential admission rotary type structure, the bottom of pre-separation chamber is the taper ash port, the epimere of tower body is that direct tube section direct tube section bottom connects the described water spray import of dusting import and placing the import top of dusting, the interior separating member of the top of direct tube section built-in Qi Inertia centrifugation and place in be connected described exhanst gas outlet with the direct tube section outer wall above the separating member.Its deficiency is that then drag losses is big if require the separative efficiency height because traditional cyclone separator is adopted in the pre-separation chamber, and occupies highly greatlyyer, is unfavorable for the layout of desulfurizing tower.
Summary of the invention:
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, the desulfurization reaction tower of circulating fluid bed of the good band percussion flow pre-duster of a kind of desulfurized effect is provided.
The present invention can reach by following measure:
A kind of desulfurization reaction tower of circulating fluid bed, it comprises tower body and the smoke outlet tube that is connected with tower body top, the multi-level water spray pipe that is connected with the tower body bottom, feed back pipe and discharge tube, the venturi pipeline section that is connected with the tower body lower end, the other end that it is characterized in that the venturi pipeline section is connected with the percussion flow pre-duster, percussion flow pre-duster bottom is the taper ash port, and percussion flow pre-duster middle part is provided with horizontal flue gas inlet tube.
The present invention can be equipped with the one-level sparge pipe at the venturi pipeline section, and the atomizer of sparge pipe places venturi aditus laryngis section, the following current spraying.The multi-level water spray pipe of tower body places the discharge tube top, to improve desulfurized effect.
Become angle with the tower body axis be 10-45 ° to feed back tubular axis line among the present invention, to guarantee that circulating ash flows into desulfurizing tower smoothly.
Horizontal flue gas inlet tube can one-sidedly be connected with the percussion flow pre-duster among the present invention, also can the bilateral symmetry connect.Percussion flow pre-duster jet pipe, also can be coaxial to jet pipe for level, can also be 3,4,6 and 8 or a plurality of jet pipe established of symmetry, injector spacing is 1-5 a times of nozzle equivalent diameter, nozzle can symmetry tilt, and tilt angle alpha is 5-60 °, and percussion flow pre-duster spray chamber can be the square-section, also can be circular or other tee section, to reach best dust removing effects.
Advantageous effect of the present invention is:
Therefore 1 has realized the pre-separation of flying dust, can cancel the big electrostatic precipitator of floor space commonly used as preseparator, embodied the desulfurizer floor space little, arrange characteristics such as compact and cheap.The air-flow of percussion flow pre-duster is generally 20-35m/s to the jet pipe flow velocity, and flow velocity is higher than common flue, so caliber is less, and floor space is little and to occupy highly little characteristics more outstanding.
2 desulfurizing tower entrance structures have omitted deflector, and Venturi tube can adopt single tube, also can adopt the multitube form, make the desulfurizing tower air-flow can both guarantee even distribution under any boiler load.
3 percussion flow pre-duster function admirables can guarantee that efficiency of dust collection is more than 85% when the ratio range of injection flow rate and dust content is 0.1-0.5kg/kg, and drag losses is lower than 500Pa.
4 spray into the water yield that hot flue gas carries out humidification can be used as the humidification water that desulfurizer itself needs, and does not cause the waste of water.
Description of drawings:
Fig. 1 is a structural representation of the present invention.
Fig. 2 is that the A-A of Fig. 1 is to structural representation.
Fig. 3 is the downward-sloping percussion flow pre-duster structural representation of described nozzle symmetry.
Mark among the figure: 1 is horizontal flue gas inlet tube, and 2 is the one-level sparge pipe, and 3 is discharge tube, and 4 is the multi-level water spray pipe, and 5 is smoke outlet tube, and 6 is direct tube section, and 7 is the feed back pipe, and 8 is the venturi pipeline section, and 9 are the percussion flow pre-duster, and 10 are the taper ash port.
The specific embodiment:
Below in conjunction with accompanying drawing the present invention is further described:
As shown in drawings, certain station boiler carries out the desulfur technology transformation, its discharging flue gas 210,000 Nm 3/ hour, 145 ℃ of flue-gas temperatures, sulfur content 3770mg/Nm 3, desulfurizer adopts single tower structure, desulfurizing tower diameter 3.2m.Draw the horizontal flue gas inlet tube (1) that desulfurizing tower bilateral symmetry connects from original twin flue, the cross section is the rectangle of 2000 * 1500m, and flue gas flow rate 14.5m/s, the ratio of humidification injection flow rate and dust content are 0.15kg/kg.The injector spacing of percussion flow pre-duster (9) is 2.5m, and spray chamber is the square-section.The converging transition of Venturi tube bottom adopts the circumference joint, and is connected with spray chamber.Two strands of air-flows of equivalent enter horizontal flue gas inlet tube (1), and along coaxial mobile in opposite directions, form percussion flow, particle is vibration back and forth in impingement region, collision is reunited mutually, and the axial velocity of air-flow fades away simultaneously, and change subsequently flows to 90 ° and flows, heavier particle after a part is reunited is discharged by taper ash port (10) owing to the gravity effect settles down.Separate flue gas behind the flying dust because humidification water evaporation heat absorption, temperature descends, and enters Venturi tube subsequently, and the SO in the flue gas takes place strong to mix with the bed material, heat transfer, mass transfer and chemical reaction 2With desulfurizing agent Ca (OH) 2Reaction generates calcium sulfite and calcium sulfate, and mixes with the bed material.Bed in the desulfurizing tower expects to be sprayed into by discharge tube (3) slaked lime powder of desulfurizing tower, and is made up of the circulating ash of feed back pipe (7) inflow desulfurizing tower.To the desulfurizing tower outlet, the completely dried substantially dry state that forms of bed material, flue gas enters the separator in downstream, and the desulfurization ash under separating flows back to desulfurizing tower by feed back pipe (7).Because flue gas is through the pre-separation of percussion flow pre-duster (9), unreacted desulfurizing agent content increases in the bed material in the desulfurizing tower and exit, the desulfurization ash of a large amount of circulations contains more desulfurizing agent, makes the interior actual reaction zone calcium sulfur ratio of tower increase, and desulfuration efficiency improves.

Claims (7)

1, a kind of desulfurization reaction tower of circulating fluid bed, it comprises tower body (6) and the smoke outlet tube (5) that is connected with tower body (6) top, the multi-level water spray pipe (4), feed back pipe (7) and the discharge tube (3) that are connected with tower body (6) bottom, the venturi pipeline section (8) that is connected with tower body (6) lower end, the other end that it is characterized in that venturi pipeline section (8) is connected with percussion flow pre-duster (9), percussion flow pre-duster (9) bottom is taper ash port (10), and percussion flow pre-duster (9) middle part is provided with horizontal flue gas inlet tube (1).
2, a kind of desulfurization reaction tower of circulating fluid bed according to claim 1 is characterized in that venturi pipeline section (8) is equipped with one-level sparge pipe (2), and the atomizer of sparge pipe places venturi aditus laryngis section, the following current spraying.
3, a kind of desulfurization reaction tower of circulating fluid bed according to claim 1 is characterized in that it is 10-45 ° that feed back pipe (7) axis becomes angle with tower body (6) axis.
4,, it is characterized in that flue gas inlet tube (1) is one-sided the connection with the connected mode of percussion flow pre-duster (9) according to the described desulfurization reaction tower of circulating fluid bed of claim 1.
5,, it is characterized in that the flue gas inlet tube (1) and the connected mode of percussion flow pre-duster (9) are that the bilateral symmetry is connected according to the described desulfurization reaction tower of circulating fluid bed of claim 1.
6,, it is characterized in that described percussion flow pre-duster (9) injector spacing is 1-5 a times of nozzle equivalent diameter according to the described desulfurization reaction tower of circulating fluid bed of claim 1.
7, according to the described desulfurization reaction tower of circulating fluid bed of claim 6, it is characterized in that the nozzle symmetry of described percussion flow pre-duster (9) tilts, the angle of inclination is 5-60 °.
CNA2007100167620A 2007-07-31 2007-07-31 Desulfurization reaction tower of circulating fluid bed Pending CN101357299A (en)

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CNA2007100167620A CN101357299A (en) 2007-07-31 2007-07-31 Desulfurization reaction tower of circulating fluid bed

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102059029A (en) * 2010-11-25 2011-05-18 东南大学 Method and device for removing fine particles in high-humidity gas fume
CN101559323B (en) * 2009-06-03 2011-09-14 周建安 Digestive circulating fluid bed flue gas desulfurization method and device
CN105013308A (en) * 2015-06-19 2015-11-04 上海理工大学 Apparatus for removing combustion flue gas CO2 through high speed rotating impinging stream ammonia (amine) method, and method thereof
CN105944539A (en) * 2016-06-17 2016-09-21 中国重型机械研究院股份公司 Venturi type desulfurizing device adopting spray drying method and desulfurizing method of desulfurizing device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101559323B (en) * 2009-06-03 2011-09-14 周建安 Digestive circulating fluid bed flue gas desulfurization method and device
CN102059029A (en) * 2010-11-25 2011-05-18 东南大学 Method and device for removing fine particles in high-humidity gas fume
CN105013308A (en) * 2015-06-19 2015-11-04 上海理工大学 Apparatus for removing combustion flue gas CO2 through high speed rotating impinging stream ammonia (amine) method, and method thereof
CN105944539A (en) * 2016-06-17 2016-09-21 中国重型机械研究院股份公司 Venturi type desulfurizing device adopting spray drying method and desulfurizing method of desulfurizing device
CN105944539B (en) * 2016-06-17 2018-10-09 中国重型机械研究院股份公司 A kind of venturi type spray drying process desulfurizer and its sulfur method

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Open date: 20090204

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