CN205386408U - Unsmooth two high -efficient coupling desulfurization system in district - Google Patents

Abstract

The utility model provides an unsmooth two high -efficient coupling desulfurization system in district, including low pH value district reaction absorption system, high pH value district reaction absorption system, unsmooth gas -liquid equipartition ring, high -efficient defogging system and dewatering system, wherein, low pH value district reaction absorption system and independent control and the operation separately of high pH value district reaction absorption system, low pH value is favorable to dissolving of lime stone and calcium sulfite, and high pH value is favorable to SO2 to absorb, in coordination SO3, thin granule, heavy metal and soluble pollutant in the desorption flue gas. The unsmooth gas -liquid equipartition ring that sets up in spraying system below is effective solve surpass (surpassing) low emission desulfurization technique in absorption tower wall region have thick liquid wall built -up and the phenomenon that SO2 escaped, avoid or reduce the wall effect on absorption tower, form the biggest gas -to -liquid contact in the certain distance range in absorption tower inner wall and near, improve the surface reaction speed of SO2 and thick liquid, reach improvement SO2's desorption ability, satisfied super (surpassing) low emission requirement.

Description

Concavo-convex two-region efficient coupling desulphurization system

Technical field

This utility model relates to concavo-convex two-region efficient coupling desulphurization system, belongs to power industry field of environment protection.

Background technology

2014, thermal power plant's Air Pollutants Emissions rapid decrease, it is achieved that the maximum range of decrease since Eleventh Five-Year Plan.Electric power sulfur dioxide (SO2) emissions in 2014 are down to 6,200,000 tons, decline 20.5% than last year, carry and complete 7,500,000 tons of target calls the previous year.Electric power SO2 emissions account for the 31.4% of whole nation SO2 emissions, and decline 6.8 percentage points than last year；Every kilowatt hour thermoelectricity generated energy SO2 emissions are 1.47 grams, decline 0.38 gram than last year.Coal electricity flue gas desulfurization installation reaches 7.6 hundred million kilowatts, and flue gas desulfurization installation proportion is risen to 91.4% in 2014 by 14% in 2005.

On December 11st, 2015, Chinese Ministry of Environmental Protection, National Development and Reform Committee, department of Bureau of Energy three issue " about printing and distributing the notice implementing in full super (surpassing) low emission in coal-burning power plant and reducing energy consumption programme of work " (environment-development [2015] 164), require " to the year two thousand twenty; all coal-burning power plants possessing transformation condition, the whole nation strive realizing minimum discharge (namely under benchmark oxygen content 6% condition, flue dust, sulfur dioxide, discharged nitrous oxides concentration are respectively no higher than 10,35,50 milligrams/cubic metre).The whole nation newly-built Thermal generation unit with good conditionsi reaches minimum discharge level.Accelerate active service Thermal generation unit minimum discharge transformation paces, totally complete before the minimum discharge transformation task completed is advanced to 2017 before eastern region in the original plan the year two thousand twenty；The requirement of eastern region progressively extending to conditional region, the whole nation, wherein, middle part strives being basically completed before 2018, and west area completes before the year two thousand twenty." coal-burning power plant's minimum discharge formally expands and enclose speed-raising.

Wherein, minimum discharge requires under benchmark oxygen content 6% condition, and sulfur dioxide emissioning concentration is not higher than 35 milligrams/cubic metre.Facing the requirement of sulfur dioxide minimum discharge, for high-sulfur ature of coal, unit load fluctuating margin is big waits practical situation, and researching and developing the desulfurization technology meeting super (surpassing) low emission of coal-fired flue-gas becomes emphasis and the difficult point of this area research.Chinese patent ZL201320574961.4 have developed double; two pH value and controls circulation desulfurization system, double; two pH value blood circulation independent operatings, improves desulfuration efficiency, it is adaptable to sulphur coal.But, in sweetening process, there is serosity wall built-up and SO in wall region, absorption tower in this technology₂Escape phenomenon, namely absorption tower wall region absorb grout distribution seriously uneven, fraction slurries as water curtain wall built-up and along tower wall discharge, thus causing within the scope of tower wall 1.2-1.5 rice, absorb serum density low, mass transfer specific surface area is little, SO₂Concentration is high, and this illustrates SO₂There is the phenomenon producing escape along inwall, causing that inner wall of tower region desulfuration efficiency reduces, thus have impact on the desulfuration efficiency of whole system.Chinese patent ZL200810018955.4 has invented a kind of flue gas wet desulfurization absorption oxidation device, equipped with the uniform ring of serosity on absorption tower inwall below shower, on ring, distribution has aperture, solve absorbing tower wall and pierce through spillage problem, under the premise not reducing circulation area, strengthen gas-to-liquid contact, be conducive to improving desulfuration efficiency.But, this patented technology belongs to single column Multi-layer sprinkling technology, and when the super design load of ature of coal sulfur is relatively big and unit load fluctuating margin is bigger, SO 2 from fume cannot meet super (surpassing) low emission requirement.

Summary of the invention

The purpose of this utility model is relatively frequent for coal-burning power plant's super design load of fire coal ature of coal, and the problems such as unit load fluctuating margin is relatively larger overcome wall region, absorption tower in super (surpassing) low emission desulfurization technology to there is serosity wall built-up and SO₂The phenomenon escaped, it is provided that a kind of concavo-convex two-region efficient coupling desulphurization system, it is to avoid or reduce the wall effect on absorption tower, absorption tower inwall and near form maximum gas-to-liquid contact in certain distance range, improve SO₂With the surface reaction speed of serosity, reach improve SO₂Elimination ability, meet super (surpassing) low emission requirement.

The concrete technical scheme that this utility model adopts is as follows:

Concavo-convex two-region efficient coupling desulphurization system, each independently control including low ph value district reactive absorption system, high ph-values district reactive absorption system, the uniform ring of concavo-convex gas-liquid, efficient demister system and dewatering system, low ph value district reactive absorption system and high ph-values district reactive absorption system and run；Described low ph value reactive absorption system includes low ph value district slurry spraying system, low ph value serosity oxidation trough, oxidation air system, low ph value slurry feeding pump and side-feeding mixer, and described high ph-values reactive absorption system includes high ph-values district slurry spraying system, fresh limestone serosity replenishment system, jacking stirrer, high ph-values slurry feeding pump, high ph-values slurry circulation case, overflow pipe and biphase rectification collecting tank；Described oxidation air system is arranged in low ph value serosity oxidation trough；The bottom of described biphase rectification collecting tank is connected to high ph-values slurry circulation case by pipeline, and described high ph-values slurry circulation case is connected to low ph value oxidation trough by overflow pipe, and described fresh limestone serosity replenishment system connects with high ph-values slurry circulation case；The described uniform ring of concavo-convex gas-liquid is separately positioned on low ph value district slurry spraying system and the lower section of high ph-values district slurry spraying system.

Described low ph value district slurry spraying system and high ph-values district slurry spraying system include multiple nozzle respectively.

The quantity of described oxidation air system is consistent with the quantity of side-feeding mixer.

This utility model has the advantage that compared to existing technology

(1) under desulfurization equipment running status, the mutual restriction problem of gas-liquid-solid phase reaction process kinetics in tower is slowed down；

(2) the uniform ring of concavo-convex gas-liquid arranged has flue gas diversion function, making the flue gas being likely to escape near tower wall come back to desulfurization zone, thus both having improved the uniformity of smoke distribution in tower, greatly reducing again escape flue gas；

(2) aperture on the uniform ring of concavo-convex gas-liquid and uniform ring has serosity convergence function, the absorption serosity making wall built-up is assembled and reallocates, thus both improve the uniformity absorbing distribution of slurry, improve again the real liquid-gas ratio participating in desulfurization, improving the mass transfer situation in Ta Bi region；

(3) low ph value district and high ph-values district reactive absorption system each independently control and run, and low ph value district is conducive to the dissolving of limestone and calcium sulfite, and high ph-values district is conducive to SO₂Absorb, can SO in cooperation-removal flue gas₃, fine grained, heavy metal and soluble pollutants；

(4) concavo-convex two-region of the present utility model efficient coupling, the uniform reciprocal action with absorption oxidation mass transport process of flow field in tower can be strengthened, frequent suitable in the super design load of ature of coal, unit load fluctuating margin is bigger waits practical situation, meets super (surpassing) the low emission requirement of coal-fired flue-gas sulfur dioxide.

Accompanying drawing explanation

Fig. 1 is this utility model concavo-convex two-region efficient coupling desulphurization system structural representation；

Fig. 2 is the detail of construction of the uniform ring of concavo-convex gas-liquid；

Fig. 3 is B-B direction view in Fig. 2；

Fig. 4 is fragmentary detail view in circle A in Fig. 2.

In figure: the former flue gas of 1-, the uniform ring of the concavo-convex gas-liquid of 2-, 3-low ph value district slurry spraying system, 4-biphase rectification collecting tank, 5-pipeline, 6-high ph-values district slurry spraying system, the efficient demister system of 7-, 8-neat stress, 9-fresh limestone serosity replenishment system, 10-jacking stirrer, 11-high ph-values slurry feeding pump, 12-high ph-values slurry circulation case, 13-overflow pipe, 14-1, 14-2 is oxidation air system, 15-side-feeding mixer, 16-low ph value slurry feeding pump, 17-slurry pump, 18-dewatering system, 19-absorbing tower wall, the uniform ring aperture of the concavo-convex gas-liquid of 20-, 21-low ph value serosity oxidation trough.

Detailed description of the invention

Below in conjunction with accompanying drawing, the utility model will be further described:

Former flue gas 1 enters desulphurization system from former flue, reacts with the low ph value slurry liquid contacts sprayed by low ph value district slurry spraying system 3, removes part SO₂, reacted serosity falls bottom low ph value oxidation trough 19, under oxidation air system 14-1 and the 14-2 air oxidation provided and side-feeding mixer 15 stirring action, generates gypsum crystallization, is delivered to dewatering system 18 through slurry pump 17 and processes.Flue gas after low ph value district spray system processes, after biphase rectification collecting tank 4 rectification, enters high ph-values district slurry spraying system 6, carries out absorption reaction with the high ph-values serosity of high ph-values district slurry spraying system 6 spray, the SO of elimination major part further₂.After reacted serosity is collected by biphase rectification collecting tank 4, by pipeline 5 overflow to high ph-values slurry circulation case 12, reacted flue gas is after high efficiency demister system 7 removes drop, and neat stress 8 is through smoke stack emission.

High ph-values serosity in high ph-values slurry circulation case 12 is through high ph-values slurry feeding pump 11, it is delivered to high ph-values district spray system 6 and is circulated spray reaction, when liquid level of slurry in high ph-values slurry circulation case 12 reach a certain height, automatic overflow is to low ph value oxidation trough 21, and fresh limestone serosity is supplemented in high ph-values slurry circulation case 12 by fresh limestone serosity replenishment system 9.

Low ph value serosity in low ph value oxidation trough 21 is delivered to the slurry spraying system 3 circulated sprinkling reaction of low ph value district by low ph value slurry feeding pump 16.

The flue gas at tower wall place enters below from the uniform ring 2 of concavo-convex gas-liquid, and the serosity sprayed with low ph value district slurry spraying system 3 and high ph-values district slurry spraying system 6 reacts in the uniform ring aperture 20 of concavo-convex gas-liquid on the uniform ring of concavo-convex gas-liquid 2, eliminates SO₂Escape and serosity wall cling phenomenon.

As in Figure 2-4, wherein, on ring, the aperture of aperture 20 is 18～30mm, percent opening is 15～30% to the structure of the uniform ring 2 of concavo-convex gas-liquid.If percent opening is big, aperture is too small, and perforate is overstocked, then ring flat-plate decrease in strength, and bubble easily collides generation air pocket, and mass transfer area reduces, and mass transfer is unfavorable.If percent opening is little, aperture is excessive, and perforate is excessively rare, then the some distribution producing bubble on ring flat-plate is too thin, and ring flat-plate utilization rate is too low, is also not suitable for.Therefore, on ring, the aperture of aperture and percent opening should have suitable interval.

The setting angle of the uniform ring 2 of concavo-convex gas-liquid is mainly determined by two factors, namely absorbs serum density and system pressure drop, and when absorbing serum density height, setting angle is big, and vice versa.Experimental study shows: under design condition, and setting angle is with 27^o～32^oBeing advisable, namely the angle between the uniform ring 2 of concavo-convex gas-liquid and absorbing tower wall 19 is set to 58^o～63^o.The material of the uniform ring 2 of concavo-convex gas-liquid can be Kazakhstan C276 alloy, two phase stainless steel 1.4529 or Stainless steel 316 L.

Claims (6)

1. concavo-convex two-region efficient coupling desulphurization system, including low ph value district reactive absorption system, high ph-values district reactive absorption system, the uniform ring of concavo-convex gas-liquid, efficient demister system and dewatering system, it is characterized in that, low ph value district reactive absorption system and high ph-values district reactive absorption system each independently control and run；Described low ph value reactive absorption system includes low ph value district slurry spraying system, low ph value serosity oxidation trough, oxidation air system, low ph value slurry feeding pump and side-feeding mixer, and described high ph-values reactive absorption system includes high ph-values district slurry spraying system, fresh limestone serosity replenishment system, jacking stirrer, high ph-values slurry feeding pump, high ph-values slurry circulation case, overflow pipe and biphase rectification collecting tank；Described oxidation air system is arranged in low ph value serosity oxidation trough；The bottom of described biphase rectification collecting tank is connected to high ph-values slurry circulation case by pipeline, and described high ph-values slurry circulation case is connected to low ph value oxidation trough by overflow pipe, and described fresh limestone serosity replenishment system connects with high ph-values slurry circulation case；The described uniform ring of concavo-convex gas-liquid is separately positioned on low ph value district slurry spraying system and the lower section of high ph-values district slurry spraying system.

2. concavo-convex two-region according to claim 1 efficient coupling desulphurization system, it is characterised in that described low ph value district slurry spraying system and high ph-values district slurry spraying system include multiple nozzle respectively.

3. concavo-convex two-region according to claim 1 efficient coupling desulphurization system, it is characterised in that the quantity of described oxidation air system is consistent with the quantity of side-feeding mixer.

4. concavo-convex two-region according to claim 1 efficient coupling desulphurization system, it is characterised in that the angle of the described uniform ring of concavo-convex gas-liquid and absorbing tower wall is 58 °～63 °.

5. concavo-convex two-region according to claim 1 efficient coupling desulphurization system, it is characterised in that on the described uniform ring of concavo-convex gas-liquid, the aperture of aperture is 18～30mm, percent opening is 15～30%.

6. according to the concavo-convex two-region efficient coupling desulphurization system one of claim 1,4 or 5 Suo Shu, it is characterised in that the material of the described uniform ring of concavo-convex gas-liquid is Kazakhstan C276 alloy, two phase stainless steel 1.4529 or Stainless steel 316 L.