CN204816215U - Catalytic cracking flue gas dust removal desulfurization is treatment equipment in coordination - Google Patents

Catalytic cracking flue gas dust removal desulfurization is treatment equipment in coordination Download PDF

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Publication number
CN204816215U
CN204816215U CN201520547725.2U CN201520547725U CN204816215U CN 204816215 U CN204816215 U CN 204816215U CN 201520547725 U CN201520547725 U CN 201520547725U CN 204816215 U CN204816215 U CN 204816215U
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flue gas
dust
catalytic cracking
desulfurizing
heat exchanger
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朱俊杰
孙军军
钱磊
叶威
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Tiancheng Environment Protection Technology Co Ltd Zhonggang Group
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Tiancheng Environment Protection Technology Co Ltd Zhonggang Group
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Abstract

The utility model relates to a catalytic cracking flue gas dust removal desulfurization is treatment equipment in coordination. Bag collector's entrance sets up heat sink 1, exit linkage booster fan 5 in bag collector upper portion smoke and dust room 2, and heat exchangers 6 are connected to booster fan 5, and heat exchanger 6 is connected respectively with exporting with the import of desulfurizing tower 7, and chimney 11 is still connected to heat exchanger 6. This equipment removes dust, the desulfurization is efficient, can satisfy the requirement of 50mgm3's in the current environmental protection standard particulate matter emission limit value and 100mgm3's SO2 emission limit value. The utility model discloses having reduced the evaporation capacity of desulfurizing tower water -logging, having reduced system's water consumption, reduced the working costs, moved reliable and stablely, it is few to produce the waste water volume, and the accessory substance can be used multipurposely.

Description

Catalytic cracking flue gas dust-removal and desulfurizing govern coordinately equipment
Technical field
The utility model belongs to petroleum refining industry catalytic cracking flue gas pollution prevention technique field, is specifically related to a kind of catalytic cracking flue gas dust-removal and desulfurizing govern coordinately equipment.
Background technology
Catalytic cracking is the Main Means of China's oil refining, but the discharge of major pollutant source of simultaneously Ye Shi oil refining enterprise.Along with the national economic development is to the continuous growth of oil demand, China's oil refines industrial crude runs constantly to be increased, and process high-sulfur simultaneously, heavy crude ratio also constantly increases, this result also in the SO discharged in catalytic cracking production process 2, dust concentration constantly increases, the problem of environmental pollution caused therefrom is also day by day serious.
After the more strict environmental protection standard of the industry such as electric power, iron and steel in recent years and the intensive appearance of policy; on April 16th, 2015; national environmental protection portion has issued " petroleum refining industry pollutant emission standard " (GB31570-2015) for petroleum chemical industry; the discharge of this standard to regeneration fume from catalytic cracking major pollutants proposes more strict requirement, wherein SO 2, particle emission limit by the 550mg/m originally performed 3and 120mg/m 3become 100mg/m respectively 3and 50mg/m 3.Therefore, the dust-removal and desulfurizing management task of regeneration fume from catalytic cracking is abnormal arduous, and it is imperative that the more effective dust-removing and desulfurization process of developmental research and technology meet more strict environmental requirement.
Regeneration fume from catalytic cracking has cigarette temperature high (200-300 DEG C), fine dust content large (particle of 0-10 μm of particle diameter accounts for more than 50%), SO 2higher (the 300-4500mg/m of concentration 3) etc. feature; Its dust concentration fluctuation is simultaneously large, and especially time waste heat boiler regular " blowing ash ", dust concentration sharply increases; Except containing except the metallic elements such as Silicified breccias in dust, also containing the heavy metal element such as nickel and vanadium, these factors all add the difficulty of effectively administering regeneration fume from catalytic cracking pollution problem.At present, China's regeneration fume from catalytic cracking dust-removal and desulfurizing is administered, and main dependence adopts external wet scrubbing technology, and its cost of investment, operation and maintenance cost are high, and the system Construction cycle is long.Meanwhile, these technical methods also exist as large in consumption alkali lye amount, produce the problems such as wastewater flow rate is large.For such situation, in recent years, domesticly also exploitation was studied to regeneration fume from catalytic cracking pollutant control technology, essentially disclosed following technology and patent document.
A kind of seawater that utilizes that patent document discloses of China Patent Publication No. CN1262145A carries out the technique of dust-removal and desulfurizing to regeneration fume from catalytic cracking, direct seawater washs regeneration fume from catalytic cracking, desulfuration efficiency, up to more than 95%, can also play good dust removing effects simultaneously.The method is simple, and invest little, the waste water of generation also can return to sea after simple process, but the method is completely by the restriction of region, can not be promoted on a large scale.
China Patent Publication No. CN104043328A patent document discloses a kind of catalysis with alkaline cracking regenerated flue gas dust-collecting sulfur-removing method, adopts spray absorption tower, whirlpool, improves efficiency of dust collection, simultaneously by optimal design, reduces the consumption of alkali lye, reduces cost of investment.But the SO that this method is last 2concentration of emission is 150mg/m 3, cannot meet the more strict environmental requirement being about to start to perform; In addition, in this technique, be furnished with a large amount of pipelines, shower nozzle, and containing a large amount of dust in loop slurry, this is by the possibility increasing pipeline, wearing and tearing and blocking occur shower nozzle, thus influential system stable, run continuously.
The process for desulphurizing and dedusting catalytic cracking regenerated smoke that patent document discloses a kind of desulfurizer regeneration of China Patent Publication No. CN101716454A, by adopting efficient aerodynamic desulfur technology, the desulfuration efficiency of more than 98% and the fine dust dust removal efficiency of more than 90% can be reached, and by the method that tower regenerates, desulfurizing agent NaOH is regenerated, and generate accessory substance gypsum outward simultaneously.But the method for the method employing precipitation removes the dust in slurries, weak effect, length consuming time, and the dust residued in slurries easily produces abrasion and blocking to pipeline and equipment; In addition, these dust residued in slurries can enter into final accessory substance, affect the quality of gypsum, thus affect the economy of this technique.
Summary of the invention
The deficiency that the utility model exists for existing regeneration fume from catalytic cracking dust-removal and desulfurizing Processing tecchnics, combine the advantage of bag type dust removing technology and Wet Flue Gas Desulfurization Technique, simultaneously for the characteristic of regeneration fume from catalytic cracking, system process is optimized and adjusts, a kind of catalytic cracking flue gas dust-removal and desulfurizing govern coordinately equipment is provided.
Technical solution of the present utility model is: a kind of catalytic cracking flue gas dust-removal and desulfurizing govern coordinately equipment, go out to arrange heat sink at the entrance of formula deduster, outlet in flue dust room, sack cleaner top connects booster fan, booster fan connects heat exchanger, heat exchanger is connected with exporting respectively with the import of desulfurizing tower, and heat exchanger also connects chimney.
Described desulfurizing tower top is provided with spraying layer, demister, between spraying layer and desulfurizing tower lower slurry layer, arrange slurry circulating pump.
Desulfurizing tower bottom is by delivery pump auxiliary connection product preparation system.
Further, sack cleaner can also be electric-bag complex dust collector.
A kind of catalytic cracking flue gas dust-removal and desulfurizing govern coordinately technique, comprises the steps:
S1: the regeneration fume from catalytic cracking after UTILIZATION OF VESIDUAL HEAT IN, temperature is about 200-300 DEG C, first by smoke temperature reducer, by its cigarette temperature drop to 150-200 DEG C;
S2: exported the regenerated flue gas come by smoke temperature reducer, airflow distribution device through sack cleaner porch enters the flue dust room of deduster after distributing air quantity, ecto-entad flows through the filter bag hanging on flue dust indoor, and the dust in flue gas is removed because of the filtration of filter bag;
S3: the neat stress after filtration, enters air-purifying chamber, is discharged by the exhaust pass of sack cleaner;
S4: when the dust of filter bag outer surface runs up to a certain degree, adopts the mode of action of low-voltage pulse winding-up to carry out deashing;
S5: the 150-200 DEG C of high-temperature flue gas come by house outlet flue, after booster fan supercharging, enters heat exchanger, is down to 105 ~ 115 DEG C with temperature after the neat stress heat exchange out of desulfurizing tower tower top, then enters desulfurizing tower and carry out desulfurization;
S6: in desulfurizing tower, makes desulfurization slurry and regenerated flue gas from bottom to top be formed by slurry circulating pump and spraying layer and reversely directly to contact, remove sulfur dioxide in flue gas;
S7: flue gas is removed after the droplet carried secretly in flue gas through demister, enters heat exchanger by absorption tower tower top outlet flue;
S8: 150-200 DEG C of warm flue gas of the neat stress and booster fan that enter heat exchanger carries out heat exchange, enters smoke stack emission.
Described step S8 neat stress temperature after heat exchange rises to 80 DEG C.
Further, the desulfurization slurry formed after desulfurization, after reaching finite concentration, with transport pump to accessory substance preparation system, carries out the preparation of accessory substance.
The beneficial effects of the utility model are: the dedusting of this equipment, desulfuration efficiency are high, can meet 50mg/m in existing environmental protection standard completely 3granular material discharged limit value and 100mg/m 3sO 2the requirement of emission limit.The utility model adds a set of heat exchanger after booster fan, the neat stress (about 50 DEG C) after by the next high-temperature flue gas (about 150-200 DEG C) of dust pelletizing system and desulfurization is utilized to carry out heat exchange, finally discharged cigarette temperature is made to be promoted to about 80 DEG C, effectively prevent the generation of chimney rain, make the cigarette temperature drop entering desulphurization system be low to moderate about 110 DEG C simultaneously, thus greatly reduce evaporation of water amount in desulfurizing tower, reduce system water consumption, reduce operating cost.In addition, before dust removing units is placed in desulfurization unit by the utility model, avoids high-load dust in regeneration fume from catalytic cracking and wearing and tearing and blocking are produced to desulfurization unit pipeline, equipment, also effectively ensure that the quality of the final accessory substance of desulfurization unit.These technical operation are reliable and stable, and produce wastewater flow rate few, accessory substance can fully utilize.
Accompanying drawing explanation
Fig. 1 is a kind of catalytic cracking flue gas dust-removal and desulfurizing govern coordinately equipment drawing.
In figure: 1-heat sink; 2-flue dust room; 3-air-purifying chamber; 4-ash bucket; 5-booster fan; 6-heat exchanger; 7-desulfurizing tower; 8-slurry circulating pump; 9-spraying layer; 10-demist layer, 11-chimney; 12-accessory substance preparation system.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described further.
A kind of catalytic cracking flue gas dust-removal and desulfurizing govern coordinately equipment, in the porch of sack cleaner, heat sink 1 is set, outlet in flue dust room, sack cleaner top 2 connects booster fan 5, booster fan 5 connects heat exchanger 6, heat exchanger 6 is connected with exporting respectively with the import of desulfurizing tower 7, and heat exchanger 6 also connects chimney 11.
Described desulfurizing tower 7 top is provided with spraying layer 9, demister 10, between spraying layer 9 and desulfurizing tower 7 lower slurry layer, arrange slurry circulating pump 8.
Described desulfurizing tower 7 bottom is by delivery pump auxiliary connection product preparation system 12.
Described sack cleaner can also be electric-bag complex dust collector.
A kind of catalytic cracking flue gas dust-removal and desulfurizing govern coordinately technique, comprises the steps:
S1, regeneration fume from catalytic cracking after UTILIZATION OF VESIDUAL HEAT IN, temperature is about 200-300 DEG C.First natural wind cooler, air blast cooling device or other type heat exchangers etc. can be adopted by smoke temperature reducer 1(), by its cigarette temperature drop to 150-200 DEG C, after entering sack cleaner to prevent the flue gas of excessive temperature, infringement is produced to filter bag.In addition, smoke temperature reducer has temp regulating function, and when can guarantee to cause exhaust gas volumn and the fluctuation of cigarette temperature producing load and changing, smoke temperature reducer outlet cigarette temperature remains on 150-200 DEG C.
S2, the regenerated flue gas exported by smoke temperature reducer 1, the flue dust room 2 of deduster is entered after the airflow distribution device reasonable distribution air quantity of sack cleaner porch, ecto-entad flows through the filter bag hanging on flue dust indoor, and the dust in flue gas is removed because of the filtration of filter bag.
Neat stress after S3, filtration, enter air-purifying chamber 3, the exhaust pass finally by deduster is discharged.Dust in flue gas, because of the filtration of filtrate, has been delayed at filter bag outer surface, and the dust when its surface runs up to a certain degree, adopts the mode of action of low-voltage pulse winding-up to carry out deashing.
When S4, deashing, the dust of filter bag outer surface can fall into ash bucket 4, at set intervals, just adopts the mode of Geldart-D particle or mechanical ash discharge by its outer row, carries out next step and dispose.
S5, the high-temperature flue gas (150-200 DEG C) that come by house outlet flue, after booster fan 5 supercharging, enter heat exchanger 6, are down to about 110 DEG C, then enter desulfurizing tower 7 and carry out desulfurization with temperature after the neat stress heat exchange out of desulfurizing tower 7 tower top.By reducing the cigarette temperature entering desulphurization system, the water yield of evaporating in sweetening process being reduced, thus reduces the water consumption of system.
S6, flue gas after heat exchanger 6 heat exchange, enter into desulfurizing tower 7 and carry out desulfurization.In tower, by slurry circulating pump 8 and spraying layer 9, desulfurization slurry and regenerated flue gas are from bottom to top formed and reversely directly to contact, series of physical chemical reaction occurs, reaches the object removing sulfur dioxide in flue gas.Flue gas after desulfurization is removed after the droplet carried secretly in flue gas through demister 10, enters heat exchanger 6 by absorption tower tower top outlet flue, after the high-temperature flue gas (150-200 DEG C) come carries out heat exchange intensification, enters chimney 11 and discharges with booster fan.Neat stress temperature after heat exchange rises to about 80 DEG C, effectively prevent the generation of chimney rain.This method desulfuration efficiency is high, can reach SO 2concentration of emission is not more than 100mg/m 3environmental requirement, and system stability is reliable, fault rate is little.
The desulfurization slurry formed after S7, desulfurization, after reaching finite concentration, with transport pump to accessory substance preparation system 12, carries out the preparation of accessory substance.Because dust removing units is placed in before desulfurization unit by the utility model, therefore, in the accessory substance that desulfurization unit finally obtains, the content of dust is few, and quality better, comprehensive utilization value is high.
By abatement equipment of the present utility model, effectively can remove the dust in regeneration fume from catalytic cracking and sulfur dioxide simultaneously, make its concentration of emission meet existing environmental requirement.The utility model effectively prevent high-load dust in regeneration fume from catalytic cracking and, easily to the problem that desulfurization unit pipeline, equipment produce wearing and tearing and blocks, also effectively ensure that the quality of the final accessory substance of desulfurization unit.In addition, this equipment, by arranging flue gas heat-exchange unit after booster fan, both effectively prevent the generation of chimney rain, has turn reduced the water consumption of desulphurization system simultaneously, reduce system operation cost.
Below detailed by reference to the accompanying drawings embodiment describes and is only preferred embodiment of the present utility model; but; the utility model is not limited to the detail in such scheme; any do in thought of the present utility model and principle any amendment, replacement (as sulfur method is adopted limestone-based process, magnesium oxide method, alkali desulphurization etc.), all in protection domain of the present utility model.

Claims (4)

1. a catalytic cracking flue gas dust-removal and desulfurizing govern coordinately equipment, it is characterized in that arranging heat sink (1) in the porch of sack cleaner, outlet in flue dust room, sack cleaner top (2) connects booster fan (5), booster fan (5) connects heat exchanger (6), heat exchanger (6) is connected with exporting respectively with the import of desulfurizing tower (7), and heat exchanger (6) also connects chimney (11).
2. a kind of catalytic cracking flue gas dust-removal and desulfurizing govern coordinately equipment according to claim 1, it is characterized in that desulfurizing tower (7) top is provided with spraying layer (9), demister (10), slurry circulating pump (8) is set between spraying layer (9) and desulfurizing tower (7) lower slurry layer.
3. a kind of catalytic cracking flue gas dust-removal and desulfurizing govern coordinately equipment according to claim 1, is characterized in that desulfurizing tower (7) bottom is by delivery pump auxiliary connection product preparation system (12).
4. a kind of catalytic cracking flue gas dust-removal and desulfurizing govern coordinately equipment according to claim 1, is characterized in that sack cleaner is electric-bag complex dust collector.
CN201520547725.2U 2015-07-27 2015-07-27 Catalytic cracking flue gas dust removal desulfurization is treatment equipment in coordination Active CN204816215U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104971612A (en) * 2015-07-27 2015-10-14 中钢集团天澄环保科技股份有限公司 Catalytic cracking flue gas precipitation and desulfuration cooperative treatment process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104971612A (en) * 2015-07-27 2015-10-14 中钢集团天澄环保科技股份有限公司 Catalytic cracking flue gas precipitation and desulfuration cooperative treatment process

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