CN104906930A - Device for desulfurization and dust removal of a Venturi rod liquid column spray fluidized column - Google Patents

Abstract

The invention belongs to the field of environmental protection and discloses a device applied to desulfurization and dust removal of a Venturi rod liquid column spray fluidized column. The device is characterized in that one or more Venturi rod layers are arranged between the upper part of a smoke inlet and a liquid column injection device. According to the device, the gas flow distribution in the spray fluidized column trends to be uniform when the smoke passes through the Venturi rod layer, so that gas-in-liquid efficient bubbling mass transfer can be generated; the Venturi rod layer also has a self-cleaning function. Compared with the ordinary liquid column tower with the same tower diameter, the mass transfer efficiency of the device can be increased by 20-30%, the gas treatment volume can be increased by 15-20%, the liquid-gas ratio can be reduced by 20-30% and the pressure drop is just increased by 100-300Pa; the device has the comprehensive advantages of high dust removal and desulfurization efficiency, low operation liquid-gas ratio, small area occupation, low investment, low operation cost and low wastewater emission, is applied to desulfurization and dust removal of smoke and is especially applied to treatment of high-temperature, high-dust or high-sulfur smoke such as regeneration smoke produced by a catalytic cracking device of petrol.

Description

A kind of Wen's rod fluid column jet flow tower flue gas desulfation dust-extraction device

Technical field

The present invention relates to a kind of flue-gas dust-removing and desulfurization integration controlling device, be specifically related to a kind ofly excellent to fluid column jet flow washing absorption and Wen layer homogenizing smoke distribution and gas-liquid bubbling fluidization are strengthened mass transfer work in coordination with the wet method flue gas dust-removing desulfurizing device be coupled.

Background technology

The Main Means that wet process of FGD dedusting is current industrial furnace exhaust gas dust, sulfur dioxide, discharged nitrous oxides control, flue gas desulfurization market accounts for more than 80%.Press adopted desulfurizing agent to distinguish, conventional technique has the kinds more than ten such as limestone/lime-gypsum method, magnesium processes, sodium method, Dual alkali, ammonia process, and through years of researches and application and development, most of technique has been tending towards ripe.Equipment aspect, has defined several wet flue gas desulfurization absorption towers differed from one another such as spray column, packed tower, bubble tower, liquid column tower and Two-way Cycle tower, combination tower.Wherein, spray void tower internals is few, vapour lock is low, less scaling, the cycle of operation is long, but desulfuration efficiency is comparatively large by the impact of air flow method inequality, and the energy consumption of slurry circulating pump is large; Packed tower mass-transfer efficiency is high, but easily blocked, and vapour lock is large, and need fixed time cleaning to upgrade filler, maintenance cost is high; JBR tower mass-transfer efficiency is high, but have that absorption process power consumption is large, flue-gas temperature reduces many, equipment and need make the also larger shortcoming of preservative treatment, floor space.Liquid column tower adopts nozzle to spray from bottom to top, and form fluid column fountain one by one, fluid column head velocity is zero, and liquid umbrella shape falls, and the drop of whereabouts and the drop of upper spray bump against and form thinner drop, thus increase gas-liquid contact is surperficial; Turbulence when absorbing liquid sprays, accelerates SO2 and absorbs and dedusting; Flue gas liquid-jet is entrainmented, and increases gas-liquid mixed; Thus, desulfuration efficiency is high, and circulating pump number is few, and equipment investment is low, and structure is simply easy to safeguard, processes large-minded, less scaling.But practical application shows, and the desulfuration efficiency of common liquid column tower is not high, usually only has 70 ~ 90%, and circulating fluid volume is comparatively large, operating cost is not low yet, also poor to the adaptive capacity of flue gas load change.

For overcoming the defect of common liquid column tower, improving the desulfurization dust-removing efficiency of liquid column tower, mainly both at home and abroad to improve from following two aspects: (1) adopts double tower or single tower Two-way Cycle to increase gas-liquid contact, improves desulfuration efficiency.As MIT devises again two contact, concurrent-countercurrent after developing liquid column-spraying tower combined type liquid column tower, makes flue gas first in left side and the absorbing liquid fluid column counter current contacting on absorption tower, and then at right-hand part and absorbing liquid co-current contact; Or first co-current contact counter current contacting again.Obvious double tower design will increase floor space, equipment investment and running cost.Tsing-Hua University etc. then propose single tower twin-stage liquid column-spraying (as Chinese patent CN1282625A), and this also can make tower height significantly increase, and increase circulating pump power consumption and running cost.(2) improve gas in tower, liquid distribution, reduce " short circuit ", increase gas-liquid contact.Gas-liquid distribution in common liquid column tower is also uneven.In order to make, flue gas and slurries are full and uniform to be contacted, and the liquid-column height that each nozzle need be made to spray is consistent and even to the covering of tower total cross-section.Therefore Chinese patent CN1795965A disclose from import to outlet caliber diminish gradually and two-way cross arrange hydrojet pipe design; CN101564641A discloses and is a kind ofly placed in the inner Orifice-plate design for regulates liquid jetting height of shotcrete pipe, to eliminate the inconsistent impact on desulfurization degree of liquid column-spraying height.Chinese patent CN202983508U then provides a kind of liquid column tower design of multistage multiple dimensioned injection, on a liquid distribution trough, namely arrange the fluid column that several jetting heights differ, and forms the spray of multilayer, drop classification increase.These patents have done improvement to liquid column-spraying, but substantially do not change the inhomogeneities into tower flue gas distribution; In addition, the increase of liquid column-spraying height must make circulating pump energy consumption increase.Distribute into tower flue gas for improving, Chinese patent CN2691692Y discloses a kind of fluid column bubble type wet type fume sweetening device, it is characterized in that between gas approach and slurries injection apparatus, set up one deck perforated trays makes the flue gas even distribution into tower and on pallet, form bubbling mass transfer to remove a part of flying dust and to carry out once desulfurization, flue gas carries out secondary desulfuration with injection fluid column again, thus improves the desulfuration efficiency of system.This patent formula can solve preferably into tower flue gas skewness problem, and increases a pallet bubbling contact raising desulfurization degree, but perforated trays will increase fouling and blocking risk, application will be subject to some restrictions.

Summary of the invention

In view of this, the object of the invention is to overcome the deficiencies in the prior art, provide that a kind of structure is relatively simple, non-scaling blocking, desulfurization dust-removing efficiency is high, liquid-gas ratio is less and the Wet fume sweetening dust remover that the liquid column-spraying that reduced investment, operating cost are low combines with the excellent layer of Wen.

So-called Wen's rod layer, the rod of the covering fluid flow area be namely made up of the solid core rod of arranging at a certain distance or hollow pipe is arranged or pipe is arranged (no longer distinguish rod and pipe below this description, be collectively referred to as rod).Because in rod row, nod gap passage reduces flaring, when fluid flows through this rod row layer, venturi overcurrent effect can be produced, therefore claim the rod row of this covering tower cross section for Wen's rod layer.

For realizing this object, technical scheme of the present invention is: in liquid column tower, arrange Wen's rod layer, form a kind of liquid column-spraying and work in coordination with Wen's rod layer the desulfurating dust removing device for flue gas (being called for short Wen's rod liquid column tower desulfation dust-extraction device) be coupled, be followed successively by absorbing liquid cyclic oxidation pond, gas approach section, smoke purifying section and demist section from bottom to top.It is characterized in that: be provided with at least one deck Wen rod layer and middle part in bottom smoke purifying section and at least one deck liquid column-spraying device is set;

Wherein said and one deck Wen rod layer be that corrosion-resistant, the metal that has sufficient mechanical strength or non-metal solid solid bar of being arranged by setting spacing by one or more or hollow pipe are arranged and formed, cover the excellent layer of the whole cross section of tower.This Wen's rod layer at least one deck, preferably two-layer, be arranged between gas approach section top and liquid injection apparatus;

Wherein said and liquid column-spraying device have at least one deck can cover the fluid column shower nozzle of tower total cross-section, be preferably two-layer fluid column shower nozzle, be connected with recycle liquid pump, absorbing liquid cyclic oxidation pond by Liquid distribution pipeline.

And Wen's rod layer works in coordination with the workflow of the flue-gas dust-removing and desulfurization device be coupled and operation principle is for liquid column-spraying of the present invention:

Heat smoke enters desulfurizing tower from smoke inlet pipeline, meet with according to setting Wen's rod layer that interrod spacing arranges, flue gas is subject to the stop of rod, pass through from the two garden nod gap passages reducing flaring, produce so-called " Venturi tube " overcurrent effect: one makes flue gas redistribution after excellent layer, close to uniform " laminar flow ", reduce flue gas " short circuit ", improve gas-liquid contact; Two due to excellent layer place flue gas lifting whereabouts liquid, can form the liquid lamella of high turbulence at excellent layer upper surface, produces " gas-in-liquid " bubbling fluidization mass transfer efficiently; Three due to nod gap high cycle speed, turbulence large, have " automatically cleaning " to act on to excellent layer, excellent cross section is smooth circular in addition, less scaling; Thus greatly improve flue gas cool-down, dedusting and the effect such as once desulfurization, depickling.The liquid that liquid column-spraying falls after rise is simultaneously lifted by flue gas at excellent layer place, forms bubbling fluidization, thus greatly extends the utilization rate of gas-liquid contact time and absorbing liquid.Flue gas leave excellent layer afterwards further up with injection fluid column complete secondary liquid column tower desulfurization and dedusting, owing to have passed through the single treatment of Wen's rod layer, smoke moisture close to saturated, temperature is low, dust-laden is few, thus this secondary desulfuration reaction than in common liquid column tower closer to optimum reaction condition, reaction is more abundant, therefore can obtain higher device desulfurization dust-removing efficiency, and the flue gas after purification is finally discharged from purifying smoke outlet after demist.

Compared with prior art, advantage of the present invention and beneficial effect are: the Wen rod layer of the present invention more than gas approach section top arranges at least one deck, utilizes Venturi effect to make inlet air flow close to uniform, reduce gas " short circuit ", improve gas-liquid contact; The liquid lamella of high turbulence is formed at Wen's rod layer upper surface, the efficient bubbling fluidization contact of " gas-in-liquid " is introduced in a tower, liquid column-spraying absorption is absorbed with bubbling fluidization organically combine, achieve collaborative coupling, thus substantially increase desulfurization dust-removing efficiency.Simultaneously because absorbing liquid extended residence time, utilization rate improve, also can reduce operation liquid-gas ratio, reduce tower height, effectively reduce operating cost.In addition, Wen's rod Rotating fields is simple, and installation and maintenance are convenient, has " self-cleaning " effect, non-scaling and blocking in operation.The present invention overcomes the shortcoming of liquid column-spraying tower preferably, and retains and developed the advantage of liquid column-spraying tower, has excellent combination property.Experiment shows, compared with common liquid column-spraying tower, under identical tower diameter size, mass-transfer efficiency of the present invention can improve 20 ~ 30%, and gas treatment amount can increase by 15 ~ 20%, and liquid-gas ratio can reduce by 20 ~ 30%, and pressure drop only increases by 100 ~ 300Pa.

Accompanying drawing explanation

For clearly expressing the object, technical solutions and advantages of the present invention, below in conjunction with accompanying drawing, the invention will be further described, wherein:

Fig. 1 is the desulfurating dust removing device for flue gas schematic diagram that liquid column-spraying of the present invention is coupled with Wen's rod layer.

The corresponding relation of the parts that the mark in figure refers to it is: 1, absorbing liquid circulatory pool, 2, gas approach pipeline, 3, gas approach section, 4, Wen's rod layer, 5, smoke purifying section, 6, liquid column-spraying device, 7, demist section, 8, purifying smoke outlet, 9, fluid column shower nozzle, 10, recycle liquid pump

Fig. 2 is monoblock type Wen rod layer schematic diagram.

Fig. 3 is sectional type Wen rod layer schematic diagram.

Detailed description of the invention

A preferably embodiment of the present invention is provided below in conjunction with accompanying drawing.

As shown in Figure 1, the fluid column jet flow tower flue gas desulfation dust-extraction device of a kind of Wen's rod layer that is coupled of the present invention, it adopts Wen's rod layer technology to improve the one of common liquid column-spraying tower flue gas desulfation dust-extraction device, referred to as Wen's rod liquid column tower.This Wen's rod liquid column tower from bottom to top, is followed successively by absorbing liquid cyclic oxidation pond 1, gas approach section 3, smoke purifying section 5 and demist section 7 and purifying smoke outlet 8.Desulfurizing tower outside is provided with recycle liquid pump 10, and the entrance of recycle liquid pump 10 is connected with circulation liquid pool inside, and recycle liquid pump 10 can adopt multiple stage parallel running, can be adapted to the load variations requirement of desulfurization fume by the number of units changing recycle liquid pump.Gas approach pipeline 2 above circulation liquid pool 1, the side of tower, be connected with smoke purifying section 5 above gas approach pipeline 2, two-layer Wen rod layer 4 be set bottom smoke purifying section 5.This Wen's rod Rotating fields can be the one of the rod of Wen shown in Fig. 2 or Fig. 3 layer, and corrosion-resistant by some, to have sufficient mechanical strength metal tube (as stainless steel tube), formation of arranging at a certain distance, covers the whole cross section of desulfurizing tower.The top of Wen's rod layer 4 is furnished with liquid column-spraying device 6, and liquid column-spraying device 6 is made up of the shower nozzle 9 upwards sprayed of branched sparge pipe arranged in parallel and pipe end.Liquid column-spraying device 6 is 700 ~ 1500mm apart from the distance of Wen's rod layer 4.

When the present invention works, heat smoke enters through the side of gas approach pipeline 2 from tower, upwards flows after turning to tower section average speed 2.5 ~ 4.5 meter per second.First flue gas upwards runs into Wen's rod layer 4, spray whereabouts liquid with liquid column-spraying device 6 bump against at excellent layer place and lift liquid, produce violent liquid layer bubbling fluidization mass transfer, complete first time desulfurization sulfur, dedusting, and the sour gas such as absorbing and removing HCI, make the distribution of Wen's rod layer 4 downstream fume gas be tending towards even simultaneously; Then the drop that flue gas continues the up fluid column that sprays with liquid column-spraying device 6 and falling occurs fully to contact, complete second time desulphurization reaction, in the process, the fluid column stream of injection also can entrainment Gas Parameters to be carried secretly, promote gas-liquid mixed, useful to raising desulfurization degree.Due to the single treatment such as cooling, dedusting, flowing homogenizing of flue gas Wen's rod layer, then the secondary desulfuration contacted with liquid column tower reacts then closer to ideal response condition, and thus desulfuration efficiency is higher.Flue gas after desulfurization, then discharge from purifying smoke outlet 8 after entering demist section 7 demist.Circulation fluid is extracted out from circulation liquid pool 1 by recycle liquid pump 10, is transported to liquid column-spraying device 6, sprays through shower nozzle 9, fall, and via Wen's rod layer 4, finally falls after rise into circulation liquid pool 1.

Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by referring to the preferred embodiments of the present invention, invention has been described, but those of ordinary skill in the art is to be understood that, various change can be made to it in the form and details, and not depart from the spirit and scope of the present invention that appended claims limits.

Claims (5)

1. Wen's rod fluid column jet flow tower flue gas desulfation dust-extraction device, is followed successively by absorbing liquid cyclic oxidation pond, gas approach section, smoke purifying section and demist section from bottom to top.It is characterized in that the Wen's rod layer more than the bottom of smoke purifying section is provided with at least one deck and one deck; In smoke purifying section, above Wen's rod layer, be provided with liquid column-spraying device; Corrosion-resistant, the metal that has sufficient mechanical strength that this Wen rod layer is arranged by setting spacing by one or more or non-metal solid solid bar or hollow pipe are arranged and are formed, and cover tower total cross-section; This liquid column-spraying device can form the liquid column-spraying of more than at least one deck and one deck height.

2., according to Wen's rod fluid column jet flow tower flue gas desulfation dust-extraction device according to claim 1, it is characterized in that, Wen's rod layer of the covering desulfurizing tower cross section addressed is made up of one or more horizontally disposed Wen's rod assembly.In every block Wen rod assembly, interrod spacing can be identical, also can be different.Interrod spacing is determined by the ventilation rate of excellent layer; The ventilation rate of rod layer is generally 10 ~ 40%.

3. according to Wen's rod fluid column jet flow tower flue gas desulfation dust-extraction device according to claim 1, it is characterized in that, at least one deck and one deck above Wen's rod layer, preferably two-layer Wen's rod layer are set bottom the smoke purifying section addressed; The distance of rod interlayer is generally 30 ~ 800mm, is preferably 100 ~ 300mm.

4. according to Wen's rod fluid column jet flow tower flue gas desulfation dust-extraction device according to claim 1, it is characterized in that, Wen's rod layer of addressing is arranged on below the liquid column-spraying device in smoke purifying section, distance apart from liquid column-spraying bottom of device is generally 300 ~ 2000mm, preferably 500 ~ 1200mm.

5. want the Wen's rod fluid column jet flow tower flue gas desulfation dust-extraction device described in 1 according to right, it is characterized in that, Wen's rod layer of addressing is arranged on the bottom of the smoke purifying section above gas approach section, Wen's rod layer is generally 300 ~ 2000mm, preferably 700 ~ 1500mm apart from the distance of gas approach pipeline upper limb.