CN1114466C - Liquid column spray process and system with pH value regulator for desulfurizing flue gas - Google Patents
Liquid column spray process and system with pH value regulator for desulfurizing flue gas Download PDFInfo
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- CN1114466C CN1114466C CN00123471A CN00123471A CN1114466C CN 1114466 C CN1114466 C CN 1114466C CN 00123471 A CN00123471 A CN 00123471A CN 00123471 A CN00123471 A CN 00123471A CN 1114466 C CN1114466 C CN 1114466C
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Abstract
The present invention discloses a liquid column spray method and a system with a pH value regulator for desulfurizing flue gases, which relates to a technology and a device for desulfurizing flue gases in combustion equipment. The present invention is characterized in that a PH value regulator is additionally arranged in the system so that the system can reasonably regulate PH values of a desulphurization reaction zone and an oxidized reaction zone according to the changes of loads of flue gases; thereby, sulfur dioxides in the flue gases are kept in the optimum environment for desulphurization reaction all the time. Therefore, compared with the prior art, the present invention has the advantages of high desulphurization efficiency, high utilization rate of desulfurizing agent, large adjustable range of liquid/ gas rate, etc. Meanwhile, the oxidized efficiency of side products of the desulphurization reaction, and the quality of gypsum are improved. The present invention is especially suitable for purifying the flue gases with large concentration content of the sulfur dioxides or the flue gases with large variable quantity.
Description
Technical field
The invention belongs to the smoke-gas wet desulfurization technical field, relate in particular to the method and system that sulfur in smoke that pulverized-coal fired boiler, grate firing boiler or other combustion apparatus discharge removes.
Background technology
The pollution of sulfur dioxide is the focus of world many countries environmental protection always, and the flue gas desulfurization technique that various countries successively develop has reached kind more than 200.But, can be applied to the industrial kind more than ten of having only.Up to the present, in the Industrial Boiler and station boiler of fire coal, be to adopt wet process of FGD more than 90%, wherein based on limestone-gypsum method, its desulfuration efficiency is higher, is the effective method of flue gas desulfurization.And other sulfur method desulfuration efficiency is low, is difficult to satisfy the environmental requirement of increasingly stringent.
There is system's relative complex usually in traditional limestone-gypsum method flue gas desulfurization technology, and floor space is bigger, and desulfurization reaction tower adopts form of bio-carrier, and SR is bigger, and occurs fouling and clogging easily, causes initial cost and operating cost all higher.
In order to address the aforementioned drawbacks, the Chinese invention patent publication number is to disclose a kind of liquid column-spraying fume desulfurizing technology among CN1117889A and the CN1221647A, its main feature is that to change packed tower be spray tower, injection apparatus is set in tower, desulfurizer slurry is upwards sprayed by nozzle, itself and sulfur dioxide in flue gas are fully reacted, realize high-efficiency desulfurization and prevent fouling and obstruction.Simultaneously, desulfurization reaction zone and desulfurizing byproduct oxidation reaction zone are arranged in the same tower body, can effectively save the floor space of system, so this patented technology has obtained using preferably.But, because this technology is relatively poor for flue gas load adjusting adaptive capacity, can not regulate preferably the acid-base value of desulfurization reaction zone and oxidation reaction zone according to actual operating mode, therefore cause desulfuration efficiency (desulfuration efficiency only is 70-90%) on the low side, degradation defective under the quality of the not high and desulfurization end product gypsum of the utilization rate of desulfurizing agent.This is because sulfur in smoke is passed the essence of the desulphurization reaction that liquid column-spraying causes in tower body be exactly the acid-base neutralization reaction, only just can obtain best desulfurized effect under pH value (acid-base value) condition of the best.Therefore, how each reaction zone pH value being carried out rational allocation, make sulfur in smoke be in all the time in the best desulphurization reaction environment, is good problem to study.
Summary of the invention
At above-mentioned prior art existing problems, purpose of the present invention and task provide a kind of liquid column-spraying method and system that have pH value regulator, this system can make the pH value in differential responses district obtain rational allocation, make sulfur in smoke be in all the time in the best desulphurization reaction environment, thereby further improve the utilization rate of desulfuration efficiency and desulfurizing agent, improve the oxidation efficiency of desulfurizing byproduct simultaneously and strengthen flue gas load and regulate adaptive capacity.
Purpose of the present invention and task are achieved through the following technical solutions:
A kind of liquid column-spraying fume desulfurizing method that has pH value regulator, this method is that the flue gas of will discharge in the combustion apparatus is radially sent into reaction tower from the reaction tower middle part, desulfurizer slurry in the alkali lye pond is sent into the reaction tower bottom by infusion pump, desulfurizer slurry is upwards sprayed by the injection apparatus that is contained in the reaction tower, in tower, form earlier from bottom to top fluid column with the flue gas following current, scatter at the top then, form from top to bottom drop with flue gas adverse current, in the last process of spraying and disperseing to fall, form the desulfurization reaction zone of the mixing of gas-liquid height, mass transfer, heat transfer; Flue gas after the desulfurization passes the demister on reaction tower top, removes moisture and thin ash in the flue gas; Slurries behind the desulphurization reaction with the dust fine grained that removes along the flow downward zoneofoxidation of the desulfurizing byproduct that enters tower bottom of tower body, the further oxidation under the airborne oxygen effect that oxidation fan is sent here of calcium sulfite in the zoneofoxidation forms calcium sulfate, through concentrating, post precipitation, the bigger part of proportion enters the gypsum treatment system in the zoneofoxidation, the acid-base value that it is characterized in that interior desulfurization reaction zone of reaction tower and desulfurizing byproduct oxidation reaction zone can be regulated according to the variation of actual load, its control method is: the pH value of desulfurization reaction zone is by pH value regulator 21 in the reaction tower, and adjusting is regulated and control from the alkali lye amount that slurries delivery pump 7 is sent to circulating pump 15; The pH value of oxidation reaction zone is regulated from the slurries quantity delivered that pH value regulator 21 is sent to tower body jointly by the pH value and the adjusting that change desulfurization reaction zone.
The acid-base value optimum controling range of desulfurization reaction zone and desulfurizing byproduct oxidation reaction zone is in the above-mentioned reaction tower: the acid-base value scope of desulfurization reaction zone is controlled at 5～8; The acid-base value scope of desulfurizing byproduct oxidation reaction zone is controlled at 3.5～5.5.
Adopt liquid column-spraying fume desulfurizing system as above-mentioned fume desulphurization method, this system mainly comprises gas fume conveying system, the desulfurizer slurry feed system, the reaction tower that contains desulfurization reaction zone and oxidation reaction zone, industry water feedwater and demister system and gypsum treatment system are formed, and described gas fume conveying system comprises flue, gas fume valve and pressure fan; The desulfurizer slurry feed system is made up of alkali lye pond, slurries delivery pump and circulating pump, reaction tower is made up of water-supply-pipe, demister, smoke inlet, exhanst gas outlet, liquid column-spraying system and blower system, it is characterized in that carrying delivery side of pump that a pH value regulator is set at slurries, this pH value regulator is made up of flow regulator and acid-base value monitoring device, and links to each other with the inlet of circulating pump and the slurries inlet of reaction tower bottom by pipeline.
The present invention compared with prior art, have the following advantages and beneficial effect: owing in this liquid column-spraying desulphurization system, be provided with a pH value regulator, therefore this system can be according to the acid-base value of the variation rational allocation desulfurization reaction zone and the accessory substance oxidation reaction zone of flue gas load, thereby make sulfur in smoke be in the utilization rate that has improved desulfuration efficiency and desulfurizing agent in the best desulphurization reaction environment effectively all the time, also improved the oxidation efficiency of desulphurization reaction accessory substance simultaneously.
Description of drawings
Accompanying drawing 1 is a concrete process chart of the present invention.
Accompanying drawing 2 is the structural representation of reaction tower.
The specific embodiment
Specify principle of the present invention, structure, technical process and preferred forms below in conjunction with accompanying drawing:
This flue gas desulphurization system mainly comprises gas fume conveying system, the desulfurizer slurry feed system, the reaction tower that contains desulfurization reaction zone and desulfurizing byproduct oxidation reaction zone, industry water feedwater and demister system and gypsum treatment system are formed, and described gas fume conveying system comprises flue 1, gas fume valve 2 and pressure fan 4; The desulfurizer slurry feed system is made up of alkali lye pond 6, slurries delivery pump 7 and circulating pump 15; Reaction tower 9 is made up of water-supply-pipe, demister 17, smoke inlet, exhanst gas outlet, liquid column-spraying system 18 and blower system 8.Outlet at slurries delivery pump 7 is provided with a pH value regulator 21, and this pH value regulator is made up of flow regulator and acid-base value monitoring device, and links to each other with the inlet of circulating pump 15 and the slurries inlet of reaction tower 9 bottoms by pipeline.This adjusting device can be monitored the pH value of desulfurization reaction zone and desulfurizing byproduct oxidation reaction zone at any time, and can regulate and control the quantity delivered of the desulfurizer slurry carried from the alkali lye pond, thereby achieves the above object.Its process is:
The flue gas of discharging from combustion apparatus radially enters reaction tower 9 by pressure fan 4 from the reaction tower middle and lower part through the control of flue 1 by gas fume valve 2; Desulfurizer slurry is upwards sprayed by the liquid column-spraying device that is contained in the reaction tower middle and lower part, forms earlier from bottom to top the fluid column with the flue gas following current in tower, scatters at the top then, forms from top to bottom the drop with flue gas adverse current.On this, send forth in the process that falls, form the high-efficiency desulfurization reaction zone of the mixing of gas-liquid height, mass transfer, heat transfer.Flue gas in the uphill process, fully mixes with desulfurizer slurry in reaction tower, but flush away parts of fine particle dust.Flue gas after the desulfurization passes the demister 17 on reaction tower top, can remove moisture and thin ash in the flue gas simultaneously; Further oxidation forms calcium sulfate under the effect of the calcium sulfite oxygen in the air that oxidation fan 8 is sent here in the desulfurizing byproduct oxidation reaction zone that the slurries behind the desulphurization reaction flow downward and enter tower bottom along tower body with the dust fine grained that removes, oxidation reaction zone.Through concentrated, post precipitation, the bigger part (mainly being lime-ash and calcium sulfate) of proportion enters the gypsum treatment system in the zoneofoxidation; Rarer part (containing the not desulfurizing agent of complete reaction) is sent back in the tower to be recycled.When exhaust gas volumn or sulfur dioxide in flue gas content change, require the PH of reaction zone to change thereupon, can regulate the pH value regulator 21 that is installed in 7 outlets of slurries delivery pump this moment, this adjusting device can be controlled the slurries quantity delivered that enters desulfurization reaction zone and zoneofoxidation, thereby realize the pH value rational allocation is made it to adapt to the variation of flue gas load and content of sulfur dioxide.Flue gas behind the desulphurization reaction carries out the demist depositing dust again to be handled, and mixes by valve 2 and partial fume, is discharged into chimney 3.
Its concrete implementation step is: with the quicklime particles of certain particle size, feeding alkali lye pond 6 and water stir the back and give pH value regulator 21 by slurries delivery pump 7 with the slurries in the alkali lye pond 6, supply with slurries for respectively tower body 9, circulating pump 15 by the soda acid adjusting device.Slurries with desulfurizing function are given the fluid column injection device 18 that is positioned at tower body 9 by circulating pump 15 by metallic conduit, and upwards the interior flue gas of the slurries that spray and tower contacts and desulphurization reaction takes place.Enter chimney 3 emptyings after the demist 17 of cleaning wet flue gas behind the desulphurization reaction through tower body top.Accessory substance calcium sulfite behind the desulphurization reaction comes downwards to the oxidation reaction zone that is positioned at tower body 9 bottoms, with the airborne oxygen generation oxidation reaction from air blast 8, generates gypsum calcium sulfate.Gypsum calcium sulfate product concentrates portion and is pumped out by gypsum pump 20 at the bottom of tower, part is returned zoneofoxidation, and part is sent to transfer cell 12, delivers to gypsum seperator 10 again and separates gypsum, and waste liquid is delivered to reservoir 11 blowdowns and handled.
When exhaust gas volumn and sulfur dioxide in flue gas concentration changed, the pH value of desulfurization reaction zone was regulated the alkali lye amount that is sent to circulating pump 15 from slurries delivery pump 7 and is regulated and control by pH value regulator 21 in the reaction tower; The pH value of oxidation reaction zone is regulated from the slurries quantity delivered that pH value regulator 21 is sent to tower body jointly by the pH value and the adjusting that change desulfurization reaction zone.
The water of clear water reserviors 5 is taken from water for industrial use, and it is returned alkali lye pond 6 and supply water except give demister 17 water supply through feed pipe.
Claims (3)
1. liquid column-spraying fume desulfurizing method that has pH value regulator, this method is that the flue gas of will discharge in the combustion apparatus is radially sent into reaction tower from the reaction tower middle part, desulfurizer slurry in the alkali lye pond is sent into the reaction tower bottom by infusion pump, desulfurizer slurry is upwards sprayed by the injection apparatus that is contained in the reaction tower, in tower, form earlier from bottom to top fluid column with the flue gas following current, scatter at the top then, form from top to bottom drop with flue gas adverse current, in the last process of spraying and disperseing to fall, form the desulfurization reaction zone of the mixing of gas-liquid height, mass transfer, heat transfer; Flue gas after the desulfurization passes the demister on reaction tower top, removes moisture and thin ash in the flue gas; Slurries behind the desulphurization reaction with the dust fine grained that removes along the flow downward zoneofoxidation of the desulfurizing byproduct that enters tower bottom of tower body, the further oxidation under the airborne oxygen effect that oxidation fan is sent here of calcium sulfite in the zoneofoxidation forms calcium sulfate, through concentrating, post precipitation, the bigger part of proportion enters the gypsum treatment system in the zoneofoxidation, it is characterized in that: the acid-base value of desulfurization reaction zone and desulfurizing byproduct oxidation reaction zone can be regulated according to the variation of actual load in the reaction tower, its control method is: the pH value of desulfurization reaction zone is by pH value regulator 21 in the reaction tower, and adjusting is regulated and control from the alkali lye amount that slurries delivery pump 7 is sent to circulating pump 15; The pH value of oxidation reaction zone is regulated from the slurries quantity delivered that pH value regulator 21 is sent to tower body jointly by the pH value and the adjusting that change desulfurization reaction zone.
2. according to the described a kind of liquid column-spraying fume desulfurizing method that has pH value regulator of claim 1, the acid-base value scope that it is characterized in that desulfurization reaction zone in the reaction tower is controlled at 5～8, and the acid-base value scope of desulfurizing byproduct oxidation reaction zone is controlled at 3.5～5.5.
3. an employing is as the liquid column-spraying fume desulfurizing system of fume desulphurization method as described in the right 1, this system mainly comprises gas fume conveying system, the desulfurizer slurry feed system, the reaction tower that contains desulfurization reaction zone and oxidation reaction zone, compositions such as industry water feedwater and demister system and gypsum treatment system, described gas fume conveying system comprises flue, gas fume valve and pressure fan; The desulfurizer slurry feed system is made up of alkali lye pond, slurries delivery pump and circulating pump, reaction tower is made up of water-supply-pipe, demister, smoke inlet, exhanst gas outlet, liquid column-spraying system and blower system, it is characterized in that carrying delivery side of pump that a pH value regulator is set at slurries, this pH value regulator is made up of flow regulator and acid-base value monitoring device, and links to each other with the inlet of circulating pump and the slurries inlet of reaction tower bottom by pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00123471A CN1114466C (en) | 2000-08-18 | 2000-08-18 | Liquid column spray process and system with pH value regulator for desulfurizing flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00123471A CN1114466C (en) | 2000-08-18 | 2000-08-18 | Liquid column spray process and system with pH value regulator for desulfurizing flue gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1286135A CN1286135A (en) | 2001-03-07 |
| CN1114466C true CN1114466C (en) | 2003-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN00123471A Expired - Lifetime CN1114466C (en) | 2000-08-18 | 2000-08-18 | Liquid column spray process and system with pH value regulator for desulfurizing flue gas |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100361733C (en) * | 2004-12-29 | 2008-01-16 | 清华大学 | Liquid column jet type stack gas desulfurization |
| CN100393395C (en) * | 2005-04-28 | 2008-06-11 | 李大明 | Desulfurization denitration dust collecting integral purifier for coal burning boiler fume gas |
| CN101468288B (en) * | 2007-12-24 | 2011-09-07 | 同方环境股份有限公司 | Desulfurizer suitable for sulfuric dioxide of large-scope change and control method thereof |
| CN101844036A (en) * | 2010-05-11 | 2010-09-29 | 上海龙净环保科技工程有限公司 | Wet flue gas desulfurization (WFGD) process for gypsum through oxidization in tower by using calcium-based strongly basic substance |
| CN106391310A (en) * | 2016-06-24 | 2017-02-15 | 中国神华能源股份有限公司 | Control method and device for alkaline substance supply of wet type dust collector |
| CN109110846B (en) * | 2018-08-22 | 2021-11-09 | 盛发环保科技（厦门）有限公司 | Desulfurization wastewater flue gas concentration reduction and cementing fixing system and process |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4497902A (en) * | 1979-04-11 | 1985-02-05 | Standard Oil Company (Indiana) | Composition for removing sulfur oxides from a gas |
| CN87102943A (en) * | 1986-04-23 | 1988-01-20 | 巴布考克日立株式会社 | The control method of wet-process flue gas desulfurization |
| CN1117889A (en) * | 1994-05-17 | 1996-03-06 | 三菱重工业株式会社 | Wet type flue gas desulfurization apparatus |
| US5540760A (en) * | 1993-11-10 | 1996-07-30 | Gottfried Bischoff & Co. Kg | Scrubber and process for flue-gas desulfurizing |
| CN1210749A (en) * | 1997-06-24 | 1999-03-17 | 东洋工程株式会社 | Desulfurization process for flue gases |
| CN1221647A (en) * | 1997-11-05 | 1999-07-07 | 三菱重工业株式会社 | Wet flue gas desulfurizer and oxygen-containing gas blowing device for use therein |
-
2000
- 2000-08-18 CN CN00123471A patent/CN1114466C/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4497902A (en) * | 1979-04-11 | 1985-02-05 | Standard Oil Company (Indiana) | Composition for removing sulfur oxides from a gas |
| CN87102943A (en) * | 1986-04-23 | 1988-01-20 | 巴布考克日立株式会社 | The control method of wet-process flue gas desulfurization |
| US5540760A (en) * | 1993-11-10 | 1996-07-30 | Gottfried Bischoff & Co. Kg | Scrubber and process for flue-gas desulfurizing |
| CN1117889A (en) * | 1994-05-17 | 1996-03-06 | 三菱重工业株式会社 | Wet type flue gas desulfurization apparatus |
| CN1210749A (en) * | 1997-06-24 | 1999-03-17 | 东洋工程株式会社 | Desulfurization process for flue gases |
| CN1221647A (en) * | 1997-11-05 | 1999-07-07 | 三菱重工业株式会社 | Wet flue gas desulfurizer and oxygen-containing gas blowing device for use therein |
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| CN1286135A (en) | 2001-03-07 |
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