CN105536450B - A kind of flue gas dehumidification process - Google Patents
A kind of flue gas dehumidification process Download PDFInfo
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- CN105536450B CN105536450B CN201510981934.2A CN201510981934A CN105536450B CN 105536450 B CN105536450 B CN 105536450B CN 201510981934 A CN201510981934 A CN 201510981934A CN 105536450 B CN105536450 B CN 105536450B
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- drier
- flue gas
- dehumidification device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/263—Drying gases or vapours by absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Drying Of Gases (AREA)
Abstract
A kind of flue gas dehumidification process, it is characterized in that：A circulating dehumidification device is set up between desulfurization island and smoke re-heater, drier flows in multiple conical hoppers of connection circulating dehumidification device two sections, in circulating dehumidification device epimere, moisture is absorbed in flue gas, wet drier obtains dry drier by high temperature flue gas drying, and dry drier is delivered to circulating dehumidification device epimere with lift bucket；So as to complete the circulation of drier, reduce moisture in the desulfurization fume of discharge.The beneficial effects of the invention are as follows：(1) flue gas dehumidifying hot driving again, reduces the generation of haze；(2) drier realizes circulation；(3) circulating dehumidification device plays a part of bridging desulfurization island and smoke re-heater；(4) desulphurization system water consumption reduction is made；(5) risk that the reheater equipment that removes smoke blocks；(6) quality of desulphurization gypsum is improved；(7) equipment corrosion harm reduces；(8) heavy metal such as mercury etc. can be removed.
Description
Technical field
The invention belongs to fire coal boiler fume process field.The present invention relates to a kind of flue gas dehumidification process, more specifically,
It is that one kind reduces flue gas discharged from coal-fired boiler moisture content and is combined with smoke re-heater, is discharged after lifting discharge flue-gas temperature
Process.
Background technology
Into 21 century, the air management in China increases year by year, and thermal power plant almost 100% has all filled desulfurization and set at present
It is standby, largely fill denitration device.In the last few years, each thermal power plant for Environmental Inputs fund number in terms of hundred billion, according to Chinese Ministry of Environmental Protection
The detection data for the emission index that door provides are declining, but haze is still increasingly severe.
The reason for causing one of this phenomenon critically important is that AND ENERGY RESOURCES CONSUMPTION IN CHINA is mainly fire coal.Maximum coal-fired user is
Boiler of power plant, boiler of power plant are wet desulphurizations more than 90%, and the flue-gas temperature after wet desulphurization is wet at 30-50 DEG C or so
Degree is at 100~200g/Nm3 (gram/mark side), and the medial humidity of China's air is only 9g/Nm3, and boiler wet method desulfurization fume exhaust is wet
Spend for more than 10 times of air medial humidity, low 80-100 DEG C than before desulfurization of temperature.Seen in total amount, by ton coal combustion wet desulphurization
Flue gas takes 1 ton of water estimation out of, and about 4,000,000,000 tons of vapor is discharged in China's fire coal boiler fume wet desulphurization to air every year.According to
Code for design of chimneys, because contaminated mist concentration reduces, the half of the generally only original dry chimney height of anti-corrosion Wet chimney after desulfurization,
Chimney height reduces, humidity increase, makes smoke evacuation be difficult to spread.
The company of Some Domestic desulfurization at present is not either because have thorough grasp technology or in order to cost-effective, to sulfur removal technology
Inappropriate simplification has been carried out with arrangement.For example, the flue gas after desulfurization is directly entered from GGH (smoke re-heater) top,
It so can no doubt simplify flue arrangement, investment reduction cost, still, because gypsum drop demisting is incomplete, or be inhaled during operation
It is bad to receive tower level control, because gravity influences, causes gypsum slurries to be easy to adhere on smoke re-heater top, causes equipment
It is frequently occluded, equipment can not normal operation.
Also Some Domestic desulfurization company directly cancels GGH (smoke re-heater), reason is：1st, it is frequently occluded, causes to take off
Sulphur island can not be run, or even influence the safe for operation of whole unit, cause compressor emergency shutdown to bring huge economic losses.2nd, cancel
GGH (smoke re-heater) has little to no effect to desulfuration efficiency, does not influence the realization of discharge index, or even because not leaking,
Even be advantageous to improve desulfuration efficiency.
Such result is to directly result in a large amount of flue gas low-temperatures, high humility discharge.Low temperature, the flue gas of high humility are difficult to expand
Dissipate, haze is also just increasingly severe.
It can be seen that reducing discharge smoke moisture, how important discharge is after lifting discharge flue-gas temperature, is to eliminate to produce haze
Effective way.
The content of the invention
It is an object of the invention to provide a kind of flue gas dehumidification process, the generation of haze is reduced.
The method of the present invention is that a circulating dehumidification device is set up between desulfurization island and smoke re-heater, and circulating dehumidification device point is up and down
Two sections, epimere is connected with smoke re-heater upper strata, and hypomere is connected with smoke re-heater lower floor；Drier is in connection two sections
Flowed in multiple conical hoppers, in circulating dehumidification device epimere, desulfurization wet flue gas flows through in upper and lower conical ring gap to be connect with dry drier
Touch, moisture is absorbed in flue gas, and dry drier is into entering circulating dehumidification device hypomere after wet drier；In circulating dehumidification device hypomere,
High-temperature flue gas flows through in upper and lower conical ring gap to be contacted with wet drier, and wet drier obtains dry drier by high temperature flue gas drying,
Dry drier is delivered to circulating dehumidification device epimere with lift bucket；So as to complete the circulation of drier, make the desulfurization fume reclaimed water of discharge
Divide and reduce.
The drier includes montmorillonite drier, silica-gel desiccant, molecular sieve desiccant, inorganic salts drier, synthesis
Water-absorbing resins and composite drying agent etc..
The present invention be embodied in it is following some：
(1) method and technique of boiler smoke dehumidifying are proposed first, is a kind of brand-new technique, are made flue gas dehumidifying discharge, are subtracted
The generation of few haze.
(2) drier realizes circulation, and the dehumidifying of flue gas do not consume drier, needed in certain actual production it is a small amount of more
Change and supplement, without the consumption of additional energy source.
(3) circulating dehumidification device plays a part of bridging desulfurization island and smoke re-heater, is easy to equipment to install.
(4) circulating dehumidification device reduces moisture content in discharge flue gas, also makes desulphurization system water consumption reduction, is particularly lacking
Water area, this advantage of this technique become more important.
(5) circulating dehumidification device plays a part of filter, reduces solid content in discharge flue gas, also smoke re-heater is disappeared
The risk blocked except equipment.
(6) circulating dehumidification device plays a part of filter, and dust content reduces in making into the flue gas of desulfurization island；Reduce work
The consumption of skill water, therefore the accumulation of chlorion is reduced in slurries；This 2 points improvement quality of desulphurization gypsum.
(7) accumulation of chlorion is reduced in slurries, and equipment corrosion harm reduces.
(8) circulating dehumidification device, which plays a part of adsorption filter, heavy metal in flue gas such as mercury etc., to be removed.
Brief description of the drawings
Accompanying drawing 1 is the process flow diagram of the embodiment of the present invention 1
Embodiment
Embodiment 1
Smoke re-heater 1 in Fig. 1, circulating dehumidification device 2, desulfurization island 3；High-temperature flue gas A, reheating purifying smoke B, drier C.
A circulating dehumidification device 2 is set up between desulfurization island 3 and smoke re-heater 1, circulating dehumidification device 2 divides two sections, epimere
It is connected with the upper strata of smoke re-heater 1, hypomere is connected with the lower floor of smoke re-heater 1；Multiple cones of the drier C in connection two sections
Flowed in shape funnel, in the epimere of circulating dehumidification device 2, desulfurization wet flue gas flows through in upper and lower conical ring gap to be contacted with dry drier, cigarette
Moisture is absorbed in gas, and dry drier is into entering the hypomere of circulating dehumidification device 2 after wet drier；In the hypomere of circulating dehumidification device 2, high temperature
Flue gas flows through in upper and lower conical ring gap to be contacted with wet drier, and wet drier obtains dry drier by high temperature flue gas drying, with carrying
Dry drier is delivered to the epimere of circulating dehumidification device 2 by bucket；So as to complete drier C circulation, make moisture in the desulfurization fume of discharge
Reduce, desulfurization fume obtains reheating purifying smoke B discharges through the heat exchange of smoke re-heater 1 again.
Flow into absorption tower 1 is 1200000Nm3/ h, temperature are that 140 DEG C of high-temperature flue gas A initially enters flue gas again
Hot device 1 is high in the hypomere of circulating dehumidification device 2 into the lower layer space of circulating dehumidification device 2 with being cooled to 110 DEG C after purifying smoke heat exchange
Warm flue gas A flows through in upper and lower conical ring gap to be contacted with wet drier, and wet drier is dried to obtain dry drier by high-temperature flue gas A,
Dry drier is delivered to the epimere of circulating dehumidification device 2 with lift bucket, flue-gas temperature is further reduced to 90 DEG C and enters desulfurization island 3；De-
Wet desulphurization, about 50 DEG C, moisture content 130g/Nm3 of desulfurization fume temperature, into the upper strata of circulating dehumidification device 2 sky are taken in sulphur island 3
Between, in the epimere of circulating dehumidification device 2, desulfurization wet flue gas flows through in upper and lower conical ring gap to be contacted with dry drier, moisture quilt in flue gas
Partially absorb, exhaust moisture content is designed as 60g/Nm3, and dry drier is into entering the hypomere of circulating dehumidification device 2 after wet drier, dehumidifying
Purifying smoke afterwards enters smoke re-heater 1 and high-temperature flue gas heat-shift, and temperature rises to 80 DEG C, reheating purifying smoke B discharges.
This example 1 can achieve the effect that：(1) dehumidifying Shuai≤50%；(2) Wu Shuai≤98% is taken off；(3) reheater that removes smoke blocks up
Fill in hidden danger；(4) drier consumption Shuai≤1.0%.
The beneficial effects of the invention are as follows：(1) flue gas dehumidifying hot driving again, reduces the generation of haze；(2) drier is realized and followed
Ring；(3) circulating dehumidification device plays a part of bridging desulfurization island and smoke re-heater；(4) desulphurization system water consumption reduction is made；(5)
The risk that the reheater equipment that removes smoke blocks；(6) quality of desulphurization gypsum is improved；(7) equipment corrosion harm reduces；(8) can take off
Removing heavy metals such as mercury etc..
Claims (2)
1. a kind of flue gas dehumidification process, it is characterized in that：A circulating dehumidification device is set up between desulfurization island and smoke re-heater, circulation removes
Wet device divides two sections, and epimere is connected with smoke re-heater upper strata, and hypomere is connected with smoke re-heater lower floor；Drier is connecting
Flowed in multiple conical hoppers of two sections, in circulating dehumidification device epimere, desulfurization wet flue gas flowed through in upper and lower conical ring gap with
The contact of dry drier, moisture is absorbed in flue gas, and dry drier is into entering circulating dehumidification device hypomere after wet drier；Removed in circulation
Wet device hypomere, high-temperature flue gas flows through in upper and lower conical ring gap to be contacted with wet drier, and wet drier is obtained by high temperature flue gas drying
Dry drier, dry drier is delivered to circulating dehumidification device epimere with lift bucket；So as to complete the circulation of drier, make the desulfurization of discharge
Moisture is reduced in flue gas.
2. flue gas dehumidification process according to claim 1, it is characterised in that：The drier include montmorillonite drier,
Silica-gel desiccant, molecular sieve desiccant, inorganic salts drier, synthesis water-absorbing resins and composite drying agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510981934.2A CN105536450B (en) | 2015-12-22 | 2015-12-22 | A kind of flue gas dehumidification process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510981934.2A CN105536450B (en) | 2015-12-22 | 2015-12-22 | A kind of flue gas dehumidification process |
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| CN105536450A CN105536450A (en) | 2016-05-04 |
| CN105536450B true CN105536450B (en) | 2017-11-24 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106642178B (en) * | 2017-01-05 | 2018-12-18 | 华电电力科学研究院 | A kind of coal-fired plant flue gas dehumidification system and technique |
| CN111389186B (en) * | 2020-03-30 | 2022-04-26 | 国家能源集团新能源技术研究院有限公司 | Method for deeply removing water from high-humidity flue gas |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201811262U (en) * | 2010-09-27 | 2011-04-27 | 洛阳市天誉环保工程有限公司 | Tail gas dehumidification device for wet-process flue gas purification |
| CN103361458A (en) * | 2013-08-06 | 2013-10-23 | 张家港山河水节能环保科技有限公司 | A humidity adjusting device for a blast furnace blast system |
| CN105413430A (en) * | 2015-12-14 | 2016-03-23 | 山东大学 | Wet flue gas desulfurization tower with deep dehumidification function and dehumidification process |
| JP2016163848A (en) * | 2013-07-11 | 2016-09-08 | デンカ株式会社 | Drain separator and compressed air dehumidifying system |
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2015
- 2015-12-22 CN CN201510981934.2A patent/CN105536450B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201811262U (en) * | 2010-09-27 | 2011-04-27 | 洛阳市天誉环保工程有限公司 | Tail gas dehumidification device for wet-process flue gas purification |
| JP2016163848A (en) * | 2013-07-11 | 2016-09-08 | デンカ株式会社 | Drain separator and compressed air dehumidifying system |
| CN103361458A (en) * | 2013-08-06 | 2013-10-23 | 张家港山河水节能环保科技有限公司 | A humidity adjusting device for a blast furnace blast system |
| CN105413430A (en) * | 2015-12-14 | 2016-03-23 | 山东大学 | Wet flue gas desulfurization tower with deep dehumidification function and dehumidification process |
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| CN105536450A (en) | 2016-05-04 |
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