CN103657392B - A kind of desulfuration absorbing tower eliminating coal burning flue gas desulfurization " gypsum rain " - Google Patents

A kind of desulfuration absorbing tower eliminating coal burning flue gas desulfurization " gypsum rain " Download PDF

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CN103657392B
CN103657392B CN201310681571.1A CN201310681571A CN103657392B CN 103657392 B CN103657392 B CN 103657392B CN 201310681571 A CN201310681571 A CN 201310681571A CN 103657392 B CN103657392 B CN 103657392B
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China
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tower
expanding
flue gas
demister
washing
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CN201310681571.1A
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Chinese (zh)
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CN103657392A (en
Inventor
张志炳
张锋
孟为民
罗华勋
巫先坤
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南京大学
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Abstract

A kind of desulfuration absorbing tower eliminating coal burning flue gas desulfurization " gypsum rain ", as shown in Figure 1, it is characterized in that: set up expanding concentric gas distributor 1 at existing former desulfurizing tower top, expanding concentric gas distributor 1 connects former desulfurizing tower with expanding strengthening except liquid foam tower body 10 sections is connected, in expanding strengthening except 1.4 3.0 times of former desulfurizing tower of a diameter of bottom of liquid foam tower body 10, expanding strengthening is except in liquid foam tower body 10, it is provided with from bottom to up and includes compound gas washing column plate 2, washing packing layer 5 and demister 8, and with the washing filler clear water spray thrower 6 that matches of packing layer 5 and the demister Water spray washer 9 that matches with demister 8, neat stress outlet 11 is had except liquid foam tower body 10 top in expanding strengthening.The present invention can thoroughly eliminate the pollution of " gypsum rain ", have simultaneously operating flexibility big, anti-dirty stifled, energy consumption is low, small investment and the outstanding advantages of efficiency height.

Description

A kind of desulfuration absorbing tower eliminating coal burning flue gas desulfurization " gypsum rain "
Technical field
The present invention relates to the improvement of coal fire discharged flue gas.
Background technology
According to statistics, in the flue gas desulfurization unit put into operation in the whole nation, 300MW and above flue gas desulfurization unit account for 86%, the unit of more than 90% uses limestone--gypsum wet flue gas desulfurizing (WFGD) technology (Zeng Tinghua, Yang Hua, Liao Yongjin etc. the debugging test of wet method fume desulfurizing system and operation [ M ]. China Electric Power Publishing House, Beijing, 2008.).In typical Gypsum Wet system process, first high-temperature flue gas is sent into swinging flue gas heater (GGH) by WFGD booster fan, in GGH, the undressed high temperature former flue gas neat stress heat-shift with about 50 DEG C of desulfurizing tower discharge, former flue gas after Bei Lengque enters the gypsum slurries haptoreaction desulfurization of desulfuration absorbing tower and spray, the later saturated flue gas of desulfurization is after two-stage demister, reenter GGH by more than former flue gas to 80 DEG C, finally entered air by chimney.The Main Function of GGH is the neat stress temperature improving and entering chimney, can not cut down Gypsum Fibrosum liquid hold-up therein.Therefore in actual motion, due to the existence of Gypsum Fibrosum liquid in flue gas, GGH is easy to blocking, has had a strong impact on the properly functioning of desulfurization equipment.But, if cancelling GGH, saturated neat stress after desulfurization is directly discharged from chimney, owing to exhaust gas temperature is relatively low, condensation is formed drop in chimney discharge process by the sulphite carried secretly in flue gas and sulfate mixed liquor foam (being commonly called as Gypsum Fibrosum liquid foam), thus define chimney periphery and " gypsum rain " (Wu Chunhua occurs, Yan Jian, Bai Yuan, Li Zhonghua. without influence factor and the strategy study [J] of GGH wet method fume desulfurizing system chimney gypsum rain. electric power science and technology and environmental protection, 2013,29 (3): 15-17).
" gypsum rain " falls behind caused mainly due to the design theory of tradition desulfurizing tower: existing desulfurizing tower design velocity of flue gas is too high, gas phase kinetic energy is excessive, thus the flue gas after desulfurization is inevitably rolled up suction when rising and had Gypsum Fibrosum liquid foam, if do not removed, they will enter smoke stack emission with flue gas.In order to avoid the subaerial pollution attached to chimney and chimney of Gypsum Fibrosum liquid, existing technique uses and arranges GGH heat exchange mode below chimney, to raise flue-gas temperature, to allowing the flue gas carrying Gypsum Fibrosum liquid secretly rise get Geng Gao when discharge, wafts farther.But it is clear that arrange GGH not only there is above major defect, be also simultaneously a kind of not only consumed energy source but also can not really solve the purgation of problem make.
Summary of the invention
The present invention provides a kind of desulfuration absorbing tower eliminating coal burning flue gas desulfurization " gypsum rain ", arranging expanding strengthening on existing fume desulfurizing tower top and remove liquid foam system, this system includes expanding tower body, gas distributor, compound gas washing column plate, the washing device such as packing layer and demister.
The flue gas entered bottom desulfurizing tower, after doctor solution spraying chemical absorbing, the gas-liquid mixed stream being made up of flue gas and the Gypsum Fibrosum liquid foam carried secretly enters sectional area of the present invention and expands the strengthening included by expanding tower body of 1.4~3.0 times except in liquid foam system.After gas-liquid mixed gas coming through distributor 1 uniform distribution, first pass around compound gas washing column plate 2 washing operation and remove major part Gypsum Fibrosum liquid foam, then go up the Gypsum Fibrosum liquid foam removing remaining to the washing packing layer 5 have fine cleaning function further, finally, flue gas rises to demister 8, discharges outside tower after removing the water smoke carried secretly in gas phase and dripping.
The technology of the present invention principle and scheme are as follows:
A kind of desulfuration absorbing tower eliminating coal burning flue gas desulfurization " gypsum rain ", as shown in Figure 1, it is characterized in that: set up expanding concentric gas distributor 1 at existing former desulfurizing tower top, expanding concentric gas distributor 1 connects former desulfurizing tower with expanding strengthening except liquid foam tower body 10 sections is connected, in expanding strengthening except 1.4-3.0 times of former desulfurizing tower of a diameter of bottom of liquid foam tower body 10, expanding strengthening is except in liquid foam tower body 10, it is provided with from bottom to up and includes compound gas washing column plate 2, washing packing layer 5 and demister 8, and with the washing filler clear water spray thrower 6 that matches of packing layer 5 and the demister Water spray washer 9 that matches with demister 8, neat stress outlet 11 is had except liquid foam tower body 10 top in expanding strengthening.
The desulfuration absorbing tower of above-mentioned elimination coal burning flue gas desulfurization " gypsum rain ", described expanding concentric gas distributor 1 is made up of 3~9 concentric circulars or concentric square, and former desulfurizing tower is rectangle, and expanding concentric gas divides gas pipe 1 to may be designed as concentric rectangles;If former desulfurizing tower is circular, expanding concentric gas distributor 1 may be designed as circular concentric, to ensure that gas-liquid mixed stream obtains uniform distribution before entering compound gas washing column plate 2.
The desulfuration absorbing tower of above-mentioned elimination coal burning flue gas desulfurization " gypsum rain ", described compound gas washing column plate 2 is made up of column plate, collecting tank 3 and cleaning mixture emptying pump 4, the rinse water declined when its wash liquid is its upper packing layers 5 and demister 8 runs, height of liquid layer on column plate is generally 30~60mm, overall presure drop remains below 800Pa, on column plate, liquid leakage rate and air-flow entrainment are less than 5%, liquid after washing enters collecting tank 3, is discharged outside tower by cleaning mixture emptying pump 4 and pipeline 7.
The desulfuration absorbing tower of above-mentioned elimination coal burning flue gas desulfurization " gypsum rain ", described compound gas washing column plate 2 typically uses the column plate that liquid foam entrainment amount is less, such as fixing or float trap column plate, Super bubble-cap tower tray etc., its percent opening can be slightly larger, between 15-20%.
The desulfuration absorbing tower of above-mentioned elimination coal burning flue gas desulfurization " gypsum rain ", described washing packing layer 5 typically uses metal structured packing, height generally 300-600mm.
The desulfuration absorbing tower of the elimination coal burning flue gas desulfurization " gypsum rain " of the present invention is following operation:
Former desulfurizing tower flue gas after desulfurization is washed enters expanding strengthening except liquid foam tower body 10 entrainment of liquid foam by the gas-liquid mixed stream that expanding concentric gas distributor 1 uniform distribution rises, expanding strengthening is amassed as lower section former desulfurizing tower sectional area 1.4~3.0 times except the tower section of liquid foam tower body, air-flow is greatly lowered in expanding strengthening except the speed in liquid foam tower body, its objective is thoroughly to eliminate Gypsum Fibrosum liquid foam to be raised flue gas stream volume and inhale and carry required gas phase kinetic energy (square being directly proportional of gas phase kinetic energy and ascending air speed secretly.Such as, if air-flow velocity is after 4.0m/s reduces to 3.0m/s, then the kinetic energy of gas phase just corresponds to original 9/16), the kinetic energy making Gypsum Fibrosum liquid foam obtain in ascending vapor is much smaller than the potential energy of liquid foam self, and so can significantly eliminate Gypsum Fibrosum liquid foam is carried secretly phenomenon by volume suction.Again through compound gas washing column plate 2 and the washing packing layer 5 with fine cleaning function, removing the Gypsum Fibrosum liquid foam of about more than 95%, flue gas rises to demister 8 subsequently, drips removing the water smoke carried secretly in flue gas, and the whole pressure drop except liquid foam system is less than 2000Pa.The Gypsum Fibrosum liquid foam reducible 95% carried secretly in flue gas can be removed, and can thoroughly solve " gypsum rain " problem generally existed in process of wet desulphurization, it is achieved thoroughly administers the effect of " gypsum rain ".
Patent of the present invention has the advantage that
1. operation energy consumption is low, reduced investment, is not required to take the extra construction land of device, only transforms on former desulfurizing tower, be a kind of economical and practical method;
2. high except Gypsum Fibrosum liquid foam efficiency, operating flexibility is big, and industry is highly reliable, there will be no clogging;
3. being no longer necessary to GGH, the GGH investment of saving is fully available for purchasing the cost of equipment of the present invention.
Accompanying drawing explanation
Fig. 1 is the flow chart of inventive method, wherein: 1 is expanding concentric gas distributor, and 2 is compound gas washing column plate, 3 is collecting tank, and 4 is cleaning mixture emptying pump, and 5 is washing packing layer, 6 is filler clear water spray thrower, and 7 is residual liquid discharge pipe, and 8 is demister, 9 is demister Water spray washer, and 10 is that expanding strengthening removes liquid foam tower body, and 11 is that neat stress exports, 12 is Primordial Qi pipeline, 13 is desulfurization absorbing liquid circulating pump, and 14 is former alkali liquor spraying system, and 15 export for desulfurization absorbing liquid.
Detailed description of the invention
Embodiment 1: the fire coal boiler fume in certain 300MW power plant uses the full flue gas desulfurization technique of wet method alkali liquor.Desulphurization system mainly includes WFGD compression fan, desulfuration absorbing tower, slurry circulating pump, gypsum dehydration machine etc..This desulfuration absorbing tower diameter 12600mm, it is arranged over two-stage demister, uses GGH heat exchange before fume emission.From properly functioning, find that chimney periphery gypsum rain phenomenon is serious.After testing, liquid foam more than content 260mg/m3 in the flue gas of discharge, more than a diameter of 20 μm of drop.Along with the growth of unit operation time, demister pressure reduction is more and more higher, and in flue gas, liquid foam content is also substantially increased, in degradating trend, and occurring that clogging occurs in second demister, also there is Severe blockage phenomenon in GGH simultaneously, eventually affects the normal work of smoke evacuation air-introduced machine.
Using the present invention to transform former desulfurizing tower, bottom former desulfurizing tower tower diameter and original assembly are constant, and the expanding strengthening in top is adjusted to 16000mm except the diameter of liquid foam tower body 10.So, the kinetic energy rising flue gas drops to original about 38%.Expanding concentric gas distributor 1 uses concentric circular gas distributor, is made up of 7 concentric circular assemblies, and its height is 1200mm.Expanding concentric gas distributor 1 connects former desulfurizing tower with expanding strengthening except liquid foam tower body 10, expanding strengthening use flow guiding type fixed float valve plate except gas washing column plate 2 compound in liquid foam tower body 10, and percent opening is 18.4%, and on column plate, liquid layer thickness is 60mm.The flow quantity dropping to compound gas washing column plate 2 from washing packing layer 5 is 2.2m3/m2.h.During operation, maintaining the liquid level in collecting tank 3 constant, surplus liquid is discharged outside tower.Washing packing layer 5 uses corrosion resistant plate corrugated regular filler, and bed height is 400mm.500mm above washing packing layer distance column plate plane, above distance washing packing layer, plane 500mm is filler filler clear water spray thrower 6, and above filler clear water spray thrower 6,800mm is demister 8 and demister Water spray washer 9.Demister only is just opened to play cleaning action when demister 8 fouling with Water spray washer 9.
Ran through continuous 3 months after using present invention transformation and show, the most thoroughly control and eliminate " gypsum rain " phenomenon.After testing, in the purifying smoke that desulfuration absorbing tower top gas phase bank of tubes goes out, the foam amount Han liquid is by the 260mg/m3 before transforming, and drops to 12mg/m3.The expanding strengthening of the present invention reduces to 1650Pa except 10 sections of stagnation pressures of liquid foam tower body.
Embodiment 2: the fire coal boiler fume of certain 150MW power plant for self-supply uses the full flue gas desulfurization technique of wet method alkali liquor.Desulphurization system mainly includes compression fan, desulfuration absorbing tower, slurry circulating pump, gypsum dehydration machine etc..This desulfuration absorbing tower diameter 8800mm, it is arranged over two-stage demister, uses GGH heat exchange before fume emission.After building up, operation finds that chimney periphery gypsum rain phenomenon is serious.After testing, liquid foam more than content 312mg/m3 in the flue gas of discharge, the diameter of drop is mostly more than 20 μm.Along with the growth of unit operation time, demister pressure reduction is more and more higher, and in flue gas, liquid foam content is also substantially increased, and in degradating trend, and occurs that clogging occurs in second demister, and Severe blockage phenomenon also occurs in GGH simultaneously, and smoke exhaust fan cannot normally work.
Using the present invention to transform former desulfurizing tower, lower tower diameter and original assembly are constant, and the expanding strengthening in top is adjusted to 12000mm except the diameter of liquid foam tower body 10.So, the kinetic energy rising flue gas drops to original about 29%.Expanding concentric gas distributor 1 uses concentric circular gas distributor, is made up of 5 concentric circular assemblies, and its height is 1100mm.Compound gas washing column plate 2 uses flow guiding type fixed float valve plate, and percent opening is 17.8%, and on column plate, liquid layer thickness is 65mm.The flow quantity dropping to compound gas washing column plate 2 from washing packing layer 5 is 2.4m3/m2.h.During operation, maintaining the liquid level in collecting tank 3 constant, surplus liquid is discharged outside tower.Washing packing layer 5 uses corrosion resistant plate corrugated regular filler, and bed height is 350mm.500mm above washing packing layer distance column plate plane, above distance washing packing layer, plane 600mm is filler filler clear water spray thrower 6, and above filler clear water spray thrower 6,600mm is demister 8 and demister Water spray washer 9.Demister only is just opened to play cleaning action when demister 8 fouling with Water spray washer 9.
Ran through continuous 2 months after using present invention transformation and show, the most thoroughly control and eliminate " gypsum rain " phenomenon.After testing, in the purifying smoke that desulfuration absorbing tower top gas phase bank of tubes goes out, the foam amount Han liquid is by the 312mg/m3 before transforming, and drops to 14.6mg/m3.The expanding strengthening of the present invention reduces to 1520Pa except 10 sections of stagnation pressures of liquid foam tower body.
Embodiment 3: the flue gas of certain 300MW × 2 coal-burning boiler power plant uses the full flue gas desulfurization technique of wet method alkali liquor, merges and uses a set of desulphurization system.Desulphurization system mainly includes compression fan, desulfuration absorbing tower, slurry circulating pump, gypsum dehydration machine, Gypsum Fibrosum liquid oxidation system etc..This desulfuration absorbing tower is rectangle 20000 × 16000mm2, it is arranged over two-stage demister, uses GGH heat exchange before fume emission.After building up, operation finds that chimney periphery gypsum rain phenomenon is serious.After testing, liquid foam more than content 363mg/m3 in the flue gas of discharge, the diameter of drop is mostly more than 20 μm.Along with the growth of unit operation time, demister pressure reduction is more and more higher, and in flue gas, liquid foam content is also substantially increased, and in degradating trend, and occurs that clogging occurs in second demister, and Severe blockage phenomenon also occurs in GGH simultaneously, and smoke exhaust fan cannot normally work.
Using the present invention to transform former desulfurizing tower, lower tower diameter and original assembly are constant, and the expanding strengthening in top is adjusted to 24000 × 20000mm except the rectangle Sopwith staff cun of liquid foam tower body 10.So, the kinetic energy rising flue gas drops to original about 44%.Expanding concentric gas distributor 1 uses concentric rectangles gas distributor, is made up of 5 concentric rectangles assemblies, and its height is 1400mm.Compound gas washing column plate 2 uses flow guiding type fixed float valve plate, and percent opening is 18.8%, and on column plate, liquid layer thickness is 58mm.The flow quantity dropping to compound gas washing column plate 2 from washing packing layer 5 is 2.0m3/m2.h.During operation, maintaining the liquid level in collecting tank 3 constant, surplus liquid is discharged outside tower.Washing packing layer 5 uses corrosion resistant plate corrugated regular filler, and bed height is 400mm.550mm above washing packing layer distance column plate plane, above distance washing packing layer, plane 600mm is filler filler clear water spray thrower 6, and above filler clear water spray thrower 6,1000mm is demister 8 and demister Water spray washer 9.Demister only is just opened to play cleaning action when demister 8 fouling with Water spray washer 9.
Ran through continuous 2 months after using present invention transformation and show, the most thoroughly control and eliminate " gypsum rain " phenomenon.After testing, in the purifying smoke that desulfuration absorbing tower top gas phase bank of tubes goes out the foam amount Han liquid by the 363mg/m before transforming3, drop to 17mg/m3.The expanding strengthening of the present invention reduces to 1890Pa except 10 sections of stagnation pressures of liquid foam tower body.

Claims (5)

1. eliminate a desulfuration absorbing tower for coal burning flue gas desulfurization " gypsum rain ", it is characterized in that: existing de- Sulfur top of tower sets up expanding concentric gas distributor (1), and expanding concentric gas distributor (1) bottom connects former desulfurizing tower, Top is connected except liquid foam tower body (10) section with expanding strengthening, and expanding strengthening removes a diameter of bottom of liquid foam tower body (10) 1.4-3.0 times of former desulfurizing tower, expanding strengthening except in liquid foam tower body (10), be provided with from bottom to up compound gas washing column plate (2), Washing packing layer (5) and demister (8), and filler clear water spray thrower (6) matched with washing packing layer (5) And demister Water spray washer (9) matched with demister (8), in expanding strengthening except liquid foam tower body (10) Top has neat stress to export (11).
The desulfuration absorbing tower of elimination coal burning flue gas desulfurization " gypsum rain " the most according to claim 1, its feature It is: described expanding concentric gas distributor (1) is made up of 3~9 concentric circulars or concentric square, and former desulfurizing tower is square Shape, expanding concentric gas divides gas pipe (1) to be concentric rectangles;If former desulfurizing tower is circular, expanding concentric gas is distributed Device (1) is circular concentric, and to ensure gas-liquid mixed stream, compound gas washing column plate (2) is front obtains uniform distribution entering.
The desulfuration absorbing tower of elimination coal burning flue gas desulfurization " gypsum rain " the most according to claim 1, its feature It is: described compound gas washing column plate (2) is made up of column plate, collecting tank (3) and cleaning mixture emptying pump (4), it Wash liquid is the rinse water declined when its upper packing layers (5) and demister (8) operation, the height of liquid layer on column plate Being 30~60mm, overall presure drop remains below 800Pa, and on column plate, liquid leakage rate and air-flow entrainment are less than 5%, Liquid after washing enters collecting tank (3), is discharged outside tower by cleaning mixture emptying pump (4) and pipeline (7).
The desulfuration absorbing tower of elimination coal burning flue gas desulfurization " gypsum rain " the most according to claim 3, its feature It is: described compound gas washing column plate (2) uses fixing or float trap column plate or Super bubble-cap tower tray, and its percent opening is Between 15-20%.
The desulfuration absorbing tower of elimination coal burning flue gas desulfurization " gypsum rain " the most according to claim 1, its feature It is: described washing packing layer (5) uses metal structured packing, and height is 300-600mm.
CN201310681571.1A 2013-12-12 A kind of desulfuration absorbing tower eliminating coal burning flue gas desulfurization " gypsum rain " CN103657392B (en)

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