CN1122559C

CN1122559C - Method for processing SO2 containing fume

Info

Publication number: CN1122559C
Application number: CN00119453A
Authority: CN
Inventors: 史汉祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-07-11
Filing date: 2000-07-11
Publication date: 2003-10-01
Anticipated expiration: 2020-07-11
Also published as: CN1280031A

Abstract

The present invention relates to the technical field sulfur dioxide desulfurization in exhaust gas, which is designed by aiming at treating wastes by the wastes and reducing production cost. The present invention is characterized in that the present invention orderly comprises the steps that slag is ground into powder, and water is added so as to prepare slurry; the slurry is pumped into an absorption tower by a pump so as to react with the fumes containing the sulfur dioxide; products coming from the lower part of the absorption tower overflow to a circulation groove for recycle; after the reaction, a part of the slurry is conveyed to a sedimentation tank, the supernatant is pumped to a material slurry groove for recycle by sedimentation and clarification, and reactants are manufactured into useful products after filtration. The present invention has the advantages of waste control by waste, convenience, simplicity and low treatment cost, and is suitable for wide use in enterprise environmental protection.

Description

Contain the sulfur dioxide flue gas processing method

Technical field

The present invention relates to sulfur dioxide removal technical field in a kind of waste gas.

Background technology

At the protection environment, effectively purify SO ₂On the smoke problem, a lot of scientific and technical personnel have developed various processing methods, as the patent No. is that China's " a kind of flue gas is done dirt sulfur removal technology and dedusting pond thereof " of 93115510.X is that a class is with rapid ball formula milk of lime spray absorption cleaning sulfur in smoke, its technological process sprays the milk of lime for preparing the SO that absorbs in the flue gas as shown in Figure 1 in the absorption tower ₂, chemical reaction takes place, produce sulfurous acid, again with the compressed-air actuated oxygen that the feeds generation sulfuric acid that reacts, again through sulfuric acid and calcium hydroxide reaction production gypsum.Be characterized in that the milk of lime uptake is big, absorptivity is up to more than 99%, and lime is cheap, adapts to bearing of entreprise cost, yet numerous weak points are still arranged: though 1. rapid ball has improved SO in milk of lime and the flue gas ₂Contact rate, but will regularly replace, must close sintering system during replacing, influence ordinary production, reduce equipment operation rate; 2.,, and increase production cost because of quick lime contains impurity sometimes or need increase lime consumption through the lime of weathering though the milk of lime uptake is big; 3. reacted gypsum is not fully utilized under the limited situation of China's consumption, and business efficiency is not remarkable; 4. the belt filter press power consumption is big in the equipment, and guipure often ruptures, and aqueous gypsum is wanted artificial treatment, and is time-consuming; 5. the PROCESS FOR TREATMENT link is more, influence each other, and labor productivity is not high, and preparation milk of lime container is thick and stupid.Also having a class is that the patent No. is 85104062 Chinese patent " smoke catalytic agent and preparation method thereof ", it is a primary raw material with industrial wastes such as iron ore slag and cigarette mud, be equipped with active carbon and grain flour, ammonia is pore creating material, so the component compatibility is comparatively complicated, and need more plant equipment and complicated technological process, more catalyst changeout trouble in industrial application.The patent No. be SU1526779 the former Soviet Union's patent report waste residue and water be made into and absorb the technology that slurries absorb flue gas, but its technological process is unreasonable, only is that slurries absorb the SO in the flue gas ₂Gas does not further utilize its waste residue, result still to exist environmental pollution, processing cost apart from shortcomings such as height are not following, economic benefit is not obvious.

Summary of the invention

Technical problem to be solved by this invention be to provide that a kind of method is simple, technological process rationally, the treatment of wastes with processes of wastes against one another, raw materials for production cost extremely low contain the sulfur dioxide flue gas processing method.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: this kind contains the sulfur dioxide flue gas processing method, it is characterized in that steps in sequence is: (1) will be abandoned slag and clay into power, add entry then and be made into slurries, described slag is from non-ferrous metals smelting works; (2) slurries are squeezed into that sulfur dioxide flue gas reacts in absorption tower and the tower with pump, wherein the two-stage tandem tower is adopted on the absorption tower, and each tower all carries circulating slot; (3) bottom, the absorption tower product that comes out overflows to circulating slot, for recycling, question response fully after, a part is transported in the sedimentation basin; (4) through the precipitation clarification, supernatant is squeezed into slurry vessel recycle, reactant is made the useful products chemical fertilizer after filtering.

Above-mentioned powder particle size better is controlled at the 150-250 order; Above-mentioned slurry water and slag weight ratio are preferably 2～20: 1; Above-mentioned absorption tower reaction temperature better is controlled at 40-120 ℃.

Facts have proved that the treatment of wastes with processes of wastes against one another is effective aborning, at first SO ₂Fume emission obtains stable effectively control; Secondly, remedy rapid ball formula milk of lime spray column and purified SO ₂The flue gas technical deficiency; The 3rd improves utilization rate of equipment and installations and labor productivity, and small investment, cost are low, profitable, and it is as shown in the table in index of correlation contrast:

Technical name	Treatment of wastes with processes of wastes against one another SO ₂Gas cleaning	Rapids ball formula milk of lime spray column SO ₂Gas cleaning	Remarks
Technical name			Remarks	Raw material consumption and cost	Slag: 3.01T self-sufficiency, cost free	Lime 1.33T CaO needs 253 yuan	Handle 1T SO ₂Consumption
The utilization of reactant	Produce reactant 15T and make chemical fertilizer 15T	Produce gypsum 8.1t/h and sell all the other stackings on a small quantity	Per hour produce reactant quantity (dry measure)	Raw material consumption and cost	Slag: 3.01T self-sufficiency, cost free	Lime 1.33T CaO needs 253 yuan	Handle 1T SO ₂Consumption
The utilization of reactant	Produce reactant 15T and make chemical fertilizer 15T		Per hour produce reactant quantity (dry measure)	The exhaust emissions degree	0-20PPM improves 25% than former technology	40-80PPM
Absorptivity	99.73％	98.91		The exhaust emissions degree	0-20PPM improves 25% than former technology	40-80PPM
Absorptivity	99.73％	98.91		Process equipment	Sedimentation and filtration is easy	Dense press filtration complexity

Above data shows that the treatment of wastes with processes of wastes against one another purifies SO ₂The flue gas new technology is considerably beyond rapid ball formula milk of lime spray column SO ₂Flue gases purification more adapts to modern management.According to this enterprise sintering machine per hour desulfurization emit SO ₂3.33/t a large amount of flue gases of concentration 7300PPM are if continue to adopt rapid ball formula milk of lime spray column to purify SO ₂Flue gas is probably seldom to guarantee and to carry out ordinary production that can not lower cost, more uncontrollable exhaust emissions is reduced to bottom line.In addition, the treatment of wastes with processes of wastes against one another brings more economic benefits to enterprise.According to above index of correlation measuring and calculating, save 8,050,000 yuan of the used quick lime expenses of milk of lime, reactant can utilize 1,080,000 tons, with 1,080 ten thousand yuan of the values of per ton hundred yuan of surveys, add saving traffic expense and other expenses and amount to about 2,000 ten thousand yuan, reduce about the about 660 yuan/t of identical cost.Equipment investment, new technology and old technology will reduce the construction fund of concentrator, belt filter press at least, if with can purify SO ₂The import equipment of flue gas more than 99.73% compared and will be saved more than 60 times, so economic benefit and social benefit are fairly obvious.

Description of drawings

Fig. 1. the milk of lime spray absorbs the sulfur dioxide in flue gas process chart;

Fig. 2. process chart of the present invention.

The specific embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

Embodiment 1. as shown in the figure, this sulfur dioxide flue gas processing method adopts ball mill that non-ferrous metals smelting works are abandoned the powder that slag grinds to form 200 order sizes earlier, add entry then and be made into slag inclusion 25% weight basis slurries, with the slag stock pump slurries are squeezed in the spray column and to be contacted with sulfur in smoke in the tower, fully reaction, the control reaction temperature is 40-120 ℃ of scope, course of reaction Zhong Ta lower part product overflows to circulating slot, for recycling, after the processing of two-stage tandem absorption spray column, a part that reacts completely is transported in the sedimentation basin, through the precipitation clarification, supernatant beaten to slurry vessel recycle, reactant is made useful products after filtering.

Its chemical reaction process is as follows:

(1)

(2)

(3)

(4)

(5)

Embodiment 2. adopts ferrous metal smelting factory to abandon waste residue and wears into average-size 250 order powder, adds entry again and is made into the slurries that contain slag 20% weight basis, and all the other are as embodiment 1.

Embodiment 3. adopts the power plant to abandon slag and wears into average-size 120 purpose powder, adds entry again and is made into the slurries that contain slag 30% weight basis, and all the other are as embodiment 1.

Embodiment 4. adopts oil plant to abandon slag and wears into average-size 180 purpose powder, adds entry again and is made into the slurries that contain slag 10% weight basis, and all the other are as embodiment 1.

Claims

1. one kind contains the sulfur dioxide flue gas processing method, it is characterized in that steps in sequence is:

(1) will abandon slag and clay into power, and add entry then and be made into slurries, described slag is from non-ferrous metals smelting works;

(2) with pump with slurries squeeze in the absorption tower with tower in sulfur dioxide flue gas react, wherein the two-stage tandem tower is adopted on the absorption tower, each tower all carries circulating slot;

(3) bottom, the absorption tower product that comes out overflows to circulating slot, for recycling, question response fully after, a part is transported in the sedimentation basin;

(4) through the precipitation clarification, supernatant is squeezed into slurry vessel recycle, and reactant is made the useful products chemical fertilizer after filtering.

2. the sulfur dioxide flue gas processing method that contains as claimed in claim 1 is characterized in that described powder particle size 100-250 order.

3. the sulfur dioxide flue gas processing method that contains as claimed in claim 1 is characterized in that described slurry water and slag weight ratio are 2～20: 1.

4. the sulfur dioxide flue gas processing method that contains as claimed in claim 1 is characterized in that described absorption tower reaction temperature is 40-120 ℃.