CN101322909A - Recirculation type semidry process reaction tower for purifying flue gas and technique thereof - Google Patents
Recirculation type semidry process reaction tower for purifying flue gas and technique thereof Download PDFInfo
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- CN101322909A CN101322909A CNA2007100419477A CN200710041947A CN101322909A CN 101322909 A CN101322909 A CN 101322909A CN A2007100419477 A CNA2007100419477 A CN A2007100419477A CN 200710041947 A CN200710041947 A CN 200710041947A CN 101322909 A CN101322909 A CN 101322909A
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- flue gas
- reaction tower
- clean flue
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- recirculation
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Abstract
The invention discloses a clean flue gas recycling semi-dry reaction tower which includes a raw flue gas inlet, a raw flue gas rectifying and guide plate, a rotary sprayer, a reaction tower body, a clean flue gas outlet and an ash exhaust opening. The reaction tower also includes a recycling clean flue gas collecting container and a clean flue gas spout; the wall surface of the reaction tower body is provided with a circle or a plurality of circles of annular clean flue gas spouts; a recycling clean flue gas collecting container is arranged outside the location of the annular clean flue gas spout. Besides, the invention also discloses a clean flue gas recycling semi-dry technique which is additionally provided with a clean flue gas recycling step. The invention can effectively overcome the boundary escape of the prior art, stop the wall surface of the reactor tower to be hardened, improve the reaction efficiency and can be applied to purify the acidic gases (HCl, SOx) and heavy metal ions in the flue gas at the outlet of a boiler for burning garbage.
Description
Technical field
The present invention relates to a kind of flue gas of refuse burning treatment facility, relate in particular to a kind of recirculation type semidry process reaction tower for purifying flue gas that is used for vent gas treatment after the waste incineration; In addition, the invention still further relates to above-mentioned clean flue gas recirculation formula semidry process.
Background technology
Contain multiple harmful substances in the flue gas that rubbish is produced when burning disposal, as sour gas: HCl, HF, SO
2, NO
X, H
2S etc. also have dioxin, furans, flying dust and heavy metal steam Pb, Hg, Cd etc., and the treatment process that uses has at present: dry method, semidry method, wet method etc.
Because the deacidification efficiency of pure dry method is low, therefore generally seldom use.
Though the wet method deacidification efficiency is very high, because equipment is huge, floor space is big, investment is high, therefore also less use.
At present using maximum in the waste incineration industry is exactly semidry process, comprises again in this technology: NID technology (desulphurizing and dust-removing integral sulfur removal technology), CFB technology (recirculating fluidized bed method flue gas desulfurization technique), rotary spraying technique technology.
Because the content of Cl element is higher in the domestic waste, so CaCl in the product after flue gas is handled
2Hydrate content very high, this just makes the viscosity of product very big, this moment is if use the NID technology or the CFB technology that comprise product recirculation in the technology difficult problem that material circulating system seriously hardens will occur.
Owing to do not comprise product recirculation in the rotary spraying technique technology, therefore present this technology at home is to adopt maximum flue gas of refuse burning treatment process, yet, in this technology, also exist a very difficult balanced contradiction: the problem of the sticking wall of reaction efficiency and product.In this technology, generally adopt Ca (OH)
2With the mixed serum of water as absorbent, absorbent slurry laterally sprays into reaction tower by a rotary sprayer that is arranged at the reaction tower top, and form intensive and superfine little drop with the acid ingredient in seizure and the absorption flue gas in reaction tower, thereby the drop evaporation condenses the heavy metal steam in the flue gas to reduce flue-gas temperature.For droplet particles is adhered on the reaction tower wall, it is dried to require the absorbent slurry particle must evaporate fully when arriving the reaction tower wall during design, form otherwise the slurries particle will be piled up on the reaction tower wall and to harden, along with the continuous growth of hardening will influence the Flow Field Distribution in the reaction tower even influence the safe operation of reaction tower, therefore between final evaporate to dryness point of slurries particle and reaction tower wall, often leave a safe distance.Certainly the flue gas in this safe distance will have no chance to touch liquid superabsorbent particles, and therefore flue gas is not carry out the depickling reaction in this scope, the border escape phenomenon that existing rotary spraying technique technology that Here it is can't overcome.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of clean flue gas recirculation semidry method reaction tower, hardens effectively to overcome border escape phenomenon and the reaction tower wall that prior art exists, and has improved reaction efficiency; For this reason, the present invention also provides a kind of clean flue gas recirculation formula semidry process.
For solving the problems of the technologies described above, the invention provides a kind of recirculation type semidry process reaction tower for purifying flue gas, it comprises: former gas approach, former flue gas rectification and guide plate, rotary sprayer, reaction tower tower body, clean exhanst gas outlet, ash discharging hole, former gas approach and former flue gas rectification and guide plate are positioned at the reaction tower top, top center position at reaction tower is equipped with rotary sprayer, clean exhanst gas outlet is positioned at the reaction tower bottom, and ash discharging hole is positioned at the reaction tower bottom; This reaction tower also comprises clean flue gas collection case of recirculation and clean flue gas spout, is provided with a circle or the clean flue gas spout of a few annulars on the wall of reaction tower tower body, is provided with the clean flue gas collection case of recirculation outside the clean flue gas spout of this annular.
In addition, the present invention also provides a kind of clean flue gas recirculation formula semidry process, comprise the steps: to enter reaction tower by former flue gas rectification and guide plate from the top of reaction tower from the former flue gas of incinerator, in reaction tower, form a rotational flow field, absorbent slurry enters the reaction tower tower body by the rotary sprayer transverse injection of rotation at a high speed, with the acidic gas in flue gas reaction, the clean flue gas after purifying enters smoke stack emission by deduster; This technology also comprises following clean flue gas recirculation step: the clean flue gas by deduster enters air-introduced machine, the clean flue gas of part that draw back in self-induced-air machine downstream is linked in the clean flue gas collection of the recirculation case of reaction tower, clean flue gas sprays by the clean flue gas spout of annular and enters the reaction tower tower body, and the zone forms one air curtain in its vicinity, and adherent former flue gas is entrainmented the comfort zone that enters reaction tower.
Beneficial effect of the present invention is: make full use of waste heat in the flue gas and make water evaporates in the absorbent lime white, product is discharged with the dry state solid form, the shortcoming of having avoided the wet cleaning technology to dispose of sewage.Its purification process is to spray into lime white when flue gas is cooled to low temperature from high temperature, with the acidic gas in flue gas reaction and obtain dry salt product, is reclaimed with deduster again.Be about to water, lime white is atomized into very thin droplet and acidic gas in flue gas is carried out sufficient mass-and heat-transfer, has not only improved efficient, the while also can make reaction product obtain drying, finally obtains tractable dry powder shape product.
According to Flow Field Calculation, in the varying duty scope of expection, the evaporate to dryness point of absorbent slurry particle is distributed in reaction tower near in the particular range at middle part, reaction tower wall in this scope is provided with a circle or the clean flue gas recirculation spout of multi-turn, this spout is distributed on the entire reaction tower circumference wall in the form of a ring, and its outside is exactly to recycle clean flue gas collection case.The clean flue gas of the part in air-introduced machine downstream is incorporated in the clean flue gas collection of the recirculation case of reaction tower, owing to there is bigger pressure reduction between the clean flue gas in air-introduced machine downstream and the reaction tower, therefore clean flue gas will spray by nozzle ring with very high flow velocity and enter reaction tower, and the zone forms one air curtain in its vicinity, this air curtain has three effects: 1, adherent former flue gas is entrainmented the comfort zone that enters reaction tower, stop the border to be escaped; 2, stop the not direct knock-on reaction tower of the absorbent slurry particle wall of evaporate to dryness, prevent to harden; 3, because the relatively lower temperature that therefore helps to reduce flue gas in the reaction tower of the clean flue-gas temperature that refluxes, thus indirect minimizing join spray water flux in the reaction tower, to reduce the humidity of flue gas, more help the sack cleaner operation in downstream.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Fig. 1 is the front view of recirculation type semidry process reaction tower for purifying flue gas of the present invention;
Fig. 2 is the vertical view of recirculation type semidry process reaction tower for purifying flue gas of the present invention;
Fig. 3 is the flow chart of the clean flue gas recirculation formula of the present invention semidry process.
Among Fig. 1 and Fig. 2: the former gas approach of 1-, the former flue gas rectification and guide of 2-plate, 3-rotary sprayer, 4-reaction tower tower body, 5-recycle clean flue gas collection case, the clean flue gas spout of 6-annular, the clean exhanst gas outlet of 7-, 8-ash discharging hole.
Among Fig. 3: A-incinerator, B-reaction tower, C-sack cleaner, D-air-introduced machine, E-chimney.
The specific embodiment
As shown in Figure 1, recirculation type semidry process reaction tower for purifying flue gas of the present invention comprises former gas approach 1, former flue gas rectification and guide plate 2, rotary sprayer 3, reaction tower tower body 4, the clean flue gas collection case 5 of recirculation, the clean flue gas spout 6 of annular, clean exhanst gas outlet 7 and ash discharging hole 8.Former gas approach 1 and former flue gas rectification and guide plate 2 are positioned at the reaction tower top, in the top center position of reaction tower rotary sprayer 3 are installed, and clean exhanst gas outlet 7 is positioned at the reaction tower bottom, and ash discharging hole 8 is positioned at the reaction tower bottom.The wall of about middle part height and position of reaction tower tower body 4 is provided with the clean flue gas spout 6 of three circle annulars, the clean flue gas spout 6 of this annular is distributed on the circumference wall of entire reaction Tata body 4, outside the clean flue gas spout 6 of this annular, be provided with recirculation clean flue gas collection case 5 (as shown in Figure 2, having the clean flue gas collection of the recirculation case 5 of 3 clean smoke inlets to be arranged on the circumference wall of reaction tower tower body 4).
As Fig. 3 and shown in Figure 1, the clean flue gas recirculation formula of the present invention semidry process mainly comprises the steps: to be introduced by former gas approach 1 (inlet temperature of former flue gas is 190～240 ℃) from the former flue gas of incinerator A, rotate into reaction tower B by former flue gas rectification and guide plate 2 at a high speed from the top of reaction tower B, in reaction tower B, form a rotational flow field, absorbent slurry (for example lime white) enters reaction tower tower body 4 by rotary sprayer 3 transverse injections of rotation at a high speed, and the space forms intensive and superfine little drop to catch and to absorb acid ingredient in the flue gas (promptly with the acidic gas in flue gas reaction and obtain dry salt product in reaction tower B, reaction time is about 15～20 seconds), thus the continuous evaporation of drop condenses the heavy metal steam in the flue gas to reduce flue-gas temperature.Clean flue gas after purifying is drawn the sack cleaner C that enters the downstream by the clean exhanst gas outlet 7 that is positioned at the reaction tower bottom (outlet temperature of clean flue gas is 140～160 ℃), final reacting product is then discharged with the dry state solid form, wherein the part bulky grain is discharged by the ash discharging hole 8 of reaction tower bottom, and remaining granule part then enters into the sack cleaner C in downstream with clean flue gas.This technology also comprises clean flue gas recirculation step: the clean flue gas by sack cleaner C enters air-introduced machine D, the clean flue gas of part that self-induced-air machine D draws back in the downstream is linked into the clean flue gas collection of the recirculation case 5 interior (another partly clean flue gas that self-induced-air machine D draws directly enters chimney E discharging) of reaction tower B, owing to there is bigger pressure reduction between the clean flue gas in air-introduced machine D downstream and the reaction tower B, therefore clean flue gas will spray by the clean flue gas spout 6 of annular with very high flow velocity and enter reaction tower tower body 4, and the zone forms one air curtain in its vicinity, adherent former flue gas is entrainmented the comfort zone that enters reaction tower, stop the border to be escaped, and stop the not direct knock-on reaction tower of the absorbent slurry particle wall of evaporate to dryness, harden preventing, simultaneously because the relatively lower temperature that therefore helps to reduce flue gas in the reaction tower of the clean flue-gas temperature that refluxes, thereby indirect minimizing join spray water flux in the reaction tower, to reduce the humidity of flue gas, more help the sack cleaner C operation in downstream.
The present invention is applicable to and purifies garbage burning boiler outlet acidic gas in flue gas (HCL, SOx etc.) and heavy metal ion.Clean flue gas recirculation formula semidry process of the present invention has increased clean flue gas recirculation step, recirculation type semidry process reaction tower for purifying flue gas of the present invention has structurally increased clean flue gas collection case of recirculation and the clean flue gas spout of annular, by improvement to technology and reaction tower structure, the present invention can effectively stop the border to be escaped, prevent that the reaction tower wall from hardening, and improved reaction efficiency.
Claims (6)
1, a kind of recirculation type semidry process reaction tower for purifying flue gas, it comprises: former gas approach, former flue gas rectification and guide plate, rotary sprayer, the reaction tower tower body, clean exhanst gas outlet, ash discharging hole, former gas approach and former flue gas rectification and guide plate are positioned at the reaction tower top, top center position at reaction tower is equipped with rotary sprayer, clean exhanst gas outlet is positioned at the reaction tower bottom, ash discharging hole is positioned at the reaction tower bottom, it is characterized in that, also comprise clean flue gas collection case of recirculation and clean flue gas spout, on the wall of reaction tower tower body, be provided with a circle or the clean flue gas spout of a few annulars, outside the clean flue gas spout of this annular, be provided with the clean flue gas collection case of recirculation.
2, recirculation type semidry process reaction tower for purifying flue gas according to claim 1 is characterized in that, clean flue gas spout of described annular and the clean flue gas collection of described recirculation case are located at the middle part height and position of reaction tower tower body.
3, recirculation type semidry process reaction tower for purifying flue gas according to claim 1 and 2 is characterized in that, the clean flue gas collection of described recirculation case is provided with clean smoke inlet.
4, recirculation type semidry process reaction tower for purifying flue gas according to claim 1 and 2, it is characterized in that, clean flue gas in the clean flue gas collection of the described recirculation case sprays by the clean flue gas spout of annular and enters the reaction tower tower body, and the clean flue gas spout near zone of annular forms the air curtain of high velocity jet in reaction tower.
5, a kind of clean flue gas recirculation formula semidry process, comprise the steps: to enter reaction tower by former flue gas rectification and guide plate from the top of reaction tower from the former flue gas of incinerator, in reaction tower, form a rotational flow field, absorbent slurry enters the reaction tower tower body by the rotary sprayer transverse injection of rotation at a high speed, with the acidic gas in flue gas reaction, the clean flue gas after purifying enters smoke stack emission by deduster; It is characterized in that, also comprise following clean flue gas recirculation step: the clean flue gas by deduster enters air-introduced machine, the clean flue gas of part that draw back in self-induced-air machine downstream is linked in the clean flue gas collection of the recirculation case of reaction tower, clean flue gas sprays by the clean flue gas spout of annular and enters the reaction tower tower body, and the zone forms one air curtain in its vicinity, and adherent former flue gas is entrainmented the comfort zone that enters reaction tower.
6, clean flue gas recirculation formula semidry process as claimed in claim 5, it is characterized in that, described clean flue gas after purifying is drawn by clean exhanst gas outlet and is entered deduster, final reacting product is then discharged with the dry state solid form, wherein the part bulky grain is discharged by the ash discharging hole of reaction tower bottom, and remaining granule part then enters deduster with clean flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100419477A CN101322909A (en) | 2007-06-13 | 2007-06-13 | Recirculation type semidry process reaction tower for purifying flue gas and technique thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100419477A CN101322909A (en) | 2007-06-13 | 2007-06-13 | Recirculation type semidry process reaction tower for purifying flue gas and technique thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644437B (en) * | 2009-08-17 | 2011-01-05 | 江苏亿金环保设备工程有限公司 | Flue gas purifying system and method |
| CN105727719A (en) * | 2016-04-13 | 2016-07-06 | 中冶焦耐工程技术有限公司 | Rotary spray absorption and purification desulfurization tower for medium-low temperature flue gas and work method of desulfurization tower |
| CN111174197A (en) * | 2020-01-14 | 2020-05-19 | 湖南文理学院 | Method for detecting and controlling oxygen content of boiler flue gas of power plant |
| CN113663502A (en) * | 2021-08-24 | 2021-11-19 | 航天环境工程有限公司 | Novel SDA reaction tower and application |
-
2007
- 2007-06-13 CN CNA2007100419477A patent/CN101322909A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101644437B (en) * | 2009-08-17 | 2011-01-05 | 江苏亿金环保设备工程有限公司 | Flue gas purifying system and method |
| CN105727719A (en) * | 2016-04-13 | 2016-07-06 | 中冶焦耐工程技术有限公司 | Rotary spray absorption and purification desulfurization tower for medium-low temperature flue gas and work method of desulfurization tower |
| CN105727719B (en) * | 2016-04-13 | 2018-02-27 | 中冶焦耐工程技术有限公司 | Desulfurizing tower and its method of work for middle low-temperature flue gas rotating spraying absorption cleaning |
| CN111174197A (en) * | 2020-01-14 | 2020-05-19 | 湖南文理学院 | Method for detecting and controlling oxygen content of boiler flue gas of power plant |
| CN113663502A (en) * | 2021-08-24 | 2021-11-19 | 航天环境工程有限公司 | Novel SDA reaction tower and application |
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Open date: 20081217 |