CN103043813A - Method and process for treating steelmaking converter gas washing water by adopting divergent CO2 - Google Patents
Method and process for treating steelmaking converter gas washing water by adopting divergent CO2 Download PDFInfo
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- CN103043813A CN103043813A CN2011103129415A CN201110312941A CN103043813A CN 103043813 A CN103043813 A CN 103043813A CN 2011103129415 A CN2011103129415 A CN 2011103129415A CN 201110312941 A CN201110312941 A CN 201110312941A CN 103043813 A CN103043813 A CN 103043813A
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Abstract
The invention provides a method for treating steelmaking converter gas washing water by adopting divergent CO2. The method comprises the following steps of: introducing CO2 in the steelmaking converter coal washing water flowing in an overhead launder, distributing a water body to a settling device through a distributor so that a scaled object is settled, and discharging the settled object and sludge in the washing water, wherein the consumption of the CO2 is 5-20mg/L in the terms of water recirculation rate, and the flowing speed of the washing water in the overhead launder is proper so that the washing water reacts with CO2 for more than 30s. The invention also provides a process for treating the steelmaking converter gas washing water. The method and the process have the advantages of simpleness in process step, strong maneuverability, high reaction efficiency, and strong treatment capacity and buffer capacity, are capable of according with the requirements of energy saving, carbon reduction, innovation and environment friendliness, and have important economic and environment-friendly benefits; and the use range of the existing industrial CO2 is enlarged.
Description
Technical field
The present invention relates to the treatment process of coal gas of steel-smelting revolving furnace washing water, and the treatment process of related total hardness water in this technique, relate in particular to and adopt the CO that disperses that captures
2The treatment process of the technique of processing coal gas of steel-smelting revolving furnace washing water and related total hardness water.
Background technology
Iron and steel industry is traditional water rich and influential family, also is one of important source of pollution that cause the water pollution.Steel industry production whole process nearly all be unable to do without water, all needs to consume great lot of water resources from ore dressing, sintering, coking, ironmaking, steel-making, each operation of steel rolling.Therefore, must whole process plan as a whole to dispose water conservation, this just requires to select as much as possible advanced technology and equipment, saving water resource in production technique.Therefore, how to reduce cyclically utilizing after the total hardness of scrubbing of converter gas water, be one and reduce the water consumption per ton steel important process.
Steelmaking process is the process of carbon and other element oxidations in the molten iron.Carbon and oxygen blast in the molten iron react, and generate CO, emerge from fire door together with furnace gas, form flue dust.The main component of flue dust is iron and its oxi, and the rate of combustion of its composition and smelting operation system, raw material quality and furnace gas is closely related.Ash-laden gas generally all adopts the two-stage Venturi scrubber to carry out dedusting and cooling.In the purification of flue gas, washing, because contacting with steam, a large amount of objectionable impuritiess such as phenol, cyanogen, carbon monoxide and solid impurity etc. enter in the water, owing in steelmaking process, must add the slag that CaO sloughs S and formation in the molten iron, and in actually operating, generally exceed the dosage of plan, add slag former lime (CaO) in the steelmaking process, the part lime powder is taken out of by flue gas in addition, enters during gas washing and generates Ca (OH) in the water
2, make that total hardness significantly raises in the water.
Therefore, because (the oxygen coverter coal-gas recovering: gas purification Oxygen Converter Gas Recovery) and cooling need in the OG system, can produce the production waste of a large amount of high temperature, high pH, high rigidity, high alkalinity, high suspended matter (SS), discharge by water trap, be scrubbing of converter gas sewage (being flue gas washing sewage).
Thereby carry out the determining total hardness of water control of OG system, prevent from forming CaCO
3In equipment or pipe surface deposition, form hard scale, guarantee that working shaft and pipeline normal water supply are the important foundations that guarantees that steel-making converter is produced.
Conventional treatment process is: at the converter steelmaking production period, in the sewage of returning (steelmaking coal gas is purified and the rear sewage that produces of cooling), add and fall hard agent, form the sedimentable matter of Calcium carbonate, in radial flow tank after sedimentation, together discharge outside the system with mud, thereby the total hardness of the system of assurance maintains below the 100mg/L all the time.
Summary of the invention
Technical problem to be solved by this invention is to have expanded existing industrial CO
2New purposes, with industrial gaseous waste CO
2Be applied in the water technology, thereby realize with CO
2Carry out water treatment for falling hard agent, therefore the invention provides a kind of coal gas of steel-smelting revolving furnace washing water total hardness water technology, this technique not only can be created economic benefit, can also create huge environmental benefit, energy-saving and emission-reduction for the whole world, improve environment and make great contribution, can effectively reduce determining total hardness of water below 50mg/L.
The invention provides a kind of total hardness water treatment method of coal gas of steel-smelting revolving furnace washing water, it comprises the steps: to pass into CO in overhead chute in the coal gas of steel-smelting revolving furnace washing water that flow
2, by water-distributing well water body is dispensed to the sedimentation that settling apparatus is embodied as dirty thing, the mud in sediment and the water body is discharged, get final product; Wherein said CO
2Consumption be 5～20mg/L (calculating with quantity of circulating water); The flow velocity of washing water is so that described washing water and CO described in this overhead chute
2Can react more than at least 30 seconds and be as the criterion, preferably be 30～60 seconds, more preferably is 40 seconds, such as 2～2.5 meter per seconds.
By passing into CO in the overhead chute before water-distributing well
2Can adjust HCO in the sewage
3 -, OH
-, and CO
3 2-Between balance, increase CO in the sewage
3 2-Content, thereby be easy in settling apparatus, form CaCO
3Precipitation can make determining total hardness of water be reduced to below the 50mg/L.
Among the present invention, described settling apparatus is the settling apparatus of the various routines in this area, preferably is radiation type precipitation pool or inclined-plate clarifying basin.Wherein, the quantity of described radiation type precipitation pool preferably is more than 2, more preferably is 3.In this or those radiation type precipitation pool, the residence time of water body preferably is 1～3h, more preferably is 3h.
The present invention also provides a kind for the treatment of process of coal gas of steel-smelting revolving furnace washing water, and it comprises the steps:
(1) the coal gas of steel-smelting revolving furnace washing water that flow out from the oxygen coverter gas recovery system enter coarse particle separator through the first overhead chute, remove particle and flow in the second overhead chute after greater than the suspended impurity of 60 μ m; This first overhead chute connects this oxygen coverter gas recovery system and this coarse particle separator; This second overhead chute connects this coarse particle separator and water-distributing well;
(2) in the sewage that in this second overhead chute, flows, pass into CO
2And the interpolation organic floculant is dispensed to settling apparatus by water-distributing well with water body again and realizes suspended substance and the common flocculating settling that becomes dirty thing, and the mud in sediment and the water body is discharged; Wherein said CO
2Consumption be 5～20mg/L (calculating with quantity of circulating water); The flow velocity of the sewage that flows in this second overhead chute is so that described sewage and CO
2And organic floculant can react more than 30 seconds be as the criterion at least, preferably is 30～60 seconds, more preferably is 40 seconds, such as 2～2.5 meter per seconds; Among the present invention, enter settling apparatus after in this second overhead chute, adding organic floculant and carry out flocculation sediment, can effectively reduce suspended substance in the water quality below 50mg/L; The sediment that forms and the mud in the sewage is by outside the residual sea water pump discharge system, determining total hardness of water rear reuse capable of circulation up to standard;
(3) will be transported to hot tub (or thermal well) through step (2) treated water body, and be transported in the cooling tower again and cool;
(4) cooled water body is transported in the water cooling pond (or cooling shaft);
(5) water body in this water cooling pond is transported in the oxygen coverter gas recovery system, gets final product.
Among the present invention, the scrubbing of converter gas water that described coal gas of steel-smelting revolving furnace washing water are this area routine, its pH value is generally 10～13, total hardness＞800mg/L, total alkalinity＞500mg/L, suspended substance (SS) is 5000mg/L～15000mg/L.
Consider the factor of utilization of waste material, the CO described in the present invention
2Preferably be industrial CO
2
Among the present invention, described organic floculant is the organic floculant of the various routines in this area, such as polyacrylamide and/or polymerize aluminum chloride.
Among the present invention, the concentration of described organic floculant in described sewage is the normal concentration of this area, preferably is 0.5mg/L～1.5mg/L, more preferably is 0.8mg/L.
Among the present invention, preferably also contain dirt dispersion agent and oxidisability biocide in the described water cooling pond.
Among the present invention, described settling apparatus is the settling apparatus of the various routines in this area, preferably is radiation type precipitation pool or inclined-plate clarifying basin.Wherein, the quantity of described radiation type precipitation pool preferably is more than 2, more preferably is 3.In this or those radiation type precipitation pool, the residence time of water body preferably is 1～3h, more preferably is 3h.
In the better embodiment of the present invention one, in described settling apparatus, also can pass into filter backwash water, thereby can process filter backwash water simultaneously.
Agents useful for same of the present invention, raw material and equipment equal commercially available getting except specified otherwise.
Among the present invention, on the basis that meets this area general knowledge, each above-mentioned technical characterictic can arbitrary combination obtain preferred embodiments.
Positive progressive effect of the present invention is: total hardness water treatment method and the coal gas of steel-smelting revolving furnace washing water treatment process steps of coal gas of steel-smelting revolving furnace washing water of the present invention are simple, workable, reaction efficiency is high, and processing power and surge capability are strong, have expanded existing industrial CO
2Use range, can meet the requirement of carbon reduction, Innovation ﹠ environment, have very important economy and environmental benefit.
Description of drawings
Fig. 1 is the employed device systems synoptic diagram of the water technology of coal gas of steel-smelting revolving furnace washing water of the present invention.
Implementation is vertical
Mode below by embodiment further specifies the present invention, but does not therefore limit the present invention among the described scope of embodiments.
Among the following embodiment, the detection method of pH value, total hardness, total alkalinity, SS is all carried out by national standard, and wherein: the water pH value examination criteria is GB6920-1986;
The total hardness examination criteria is GB/T7477-1987;
The total alkalinity examination criteria is GB/T 15451-2006;
The suspended substance examination criteria is GB/T 11901-1989.
Embodiment 1
The SS=9850mg/L of coal gas of steel-smelting revolving furnace washing water backwater, total hardness=1000mg/L, phenolphthalein alkalinity=1300mg/L, total alkalinity=1500mg/L, HCO
3 -=400mg/L, OH
-=1100mg/L, CO
3 2-=0, pH value is 12.12, and color is black.
Coal gas of steel-smelting revolving furnace washing water treatment process (referring to Fig. 1 system):
(1) the coal gas of steel-smelting revolving furnace washing water that flow out of OG system enter coarse particle separator through the first overhead chute and remove particle and flow in the second overhead chute after greater than the suspended impurity of 60 μ m; At the second overhead chute place, pass into continuously 5mg/L industry CO
2(calculating with the water body internal circulating load) and 1mg/L polyacrylamide, the scrubbing of converter gas water that reacts after 30 seconds enters the 1-3# radiation type precipitation pool by the water-distributing well evenly distribute;
(2) after radiation type precipitation pool stops 1h, enter hot tub;
(3) be transported to cooling tower with lift pump, the water body after the cooling tower cooling enters water cooling pond, is supplied toward each user by working shaft.
Extracting working shaft water supply detects: total hardness is 140mg/L, and suspended substance is 46.8mg/L, phenolphthalein alkalinity 600mg/L, total alkalinity 900mg/L, HCO
3 -=0mg/L, OH
-=300mg/L, CO
3 2-=300mg/L, color is colourless.
As calculated, the clearance of total hardness is 99.53% up to the clearance of 86%, SS.
Embodiment 2
The SS=7752mg/L of coal gas of steel-smelting revolving furnace washing water backwater, total hardness=980mg/L, phenolphthalein alkalinity=1300mg/L, total alkalinity=1450mg/L, HCO
3 -=300mg/L, OH
-=1150mg/L, CO
3 2-=0, pH value is 12.07, and color is black.
Coal gas of steel-smelting revolving furnace washing water treatment process (referring to Fig. 1 system):
(1) the coal gas of steel-smelting revolving furnace washing water that flow out of OG system enter coarse particle separator through the first overhead chute and remove particle and flow in the second overhead chute after greater than the suspended impurity of 60 μ m; At the second overhead chute place, pass into continuously 10mg/L industry CO
2(calculating with the water body internal circulating load) and 1mg/L polyacrylamide, the scrubbing of converter gas water that reacts after 60 seconds enters the 1-3# radiation type precipitation pool by the water-distributing well evenly distribute;
(2) after radiation type precipitation pool stops 1h, enter hot tub;
(3) be transported to cooling tower with lift pump, the water body after the cooling tower cooling enters water cooling pond, is supplied toward each user by working shaft.
Extract working shaft water supply and detect, as calculated: the clearance of total hardness is 99.51% up to the clearance of 90.2%, SS, and color is colourless.
Embodiment 3
The SS=8205mg/L of coal gas of steel-smelting revolving furnace washing water backwater, total hardness=900mg/L, phenolphthalein alkalinity=1200mg/L, total alkalinity=1300mg/L, HCO
3 -=200mg/L, OH
-=1100mg/L, CO
3 2-=0, pH value is 11.95, and color is black.
Coal gas of steel-smelting revolving furnace washing water treatment process (referring to Fig. 1 system):
(1) the coal gas of steel-smelting revolving furnace washing water that flow out of OG system enter coarse particle separator through the first overhead chute and remove particle and flow in the second overhead chute after greater than the suspended impurity of 60 μ m; At the second overhead chute place, pass into continuously 15mg/L industry CO
2(calculating with the water body internal circulating load) and 1mg/L polyacrylamide, the scrubbing of converter gas water that reacts after 30 seconds enters the 1-3# radiation type precipitation pool by the water-distributing well evenly distribute;
(2) after radiation type precipitation pool stops 1h, enter hot tub;
(3) be transported to cooling tower with lift pump, the water body after the cooling tower cooling enters water cooling pond, is supplied toward each user by working shaft.
Extract working shaft water supply and detect, as calculated: the clearance of total hardness is 99.51% up to the clearance of 92.7%, SS, and color is colourless.
Embodiment 4
The SS=6205mg/L of coal gas of steel-smelting revolving furnace washing water backwater, total hardness=500mg/L, phenolphthalein alkalinity=1000mg/L, total alkalinity=1200mg/L, HCO
3 -=400mg/L, OH
-=800mg/L, CO
3 2-=0, pH value is 11.78, and color is light/dark balance.
Coal gas of steel-smelting revolving furnace washing water treatment process (referring to Fig. 1 system):
(1) the coal gas of steel-smelting revolving furnace washing water that flow out of OG system enter coarse particle separator through the first overhead chute and remove particle and flow in the second overhead chute after greater than the suspended impurity of 60 μ m; At the second overhead chute place, pass into continuously 20mg/L industry CO
2(calculating with the water body internal circulating load) and 0.8mg/L polyacrylamide, the scrubbing of converter gas water that reacts after 40 seconds enters the 1-3# radiation type precipitation pool by the water-distributing well evenly distribute;
(2) after radiation type precipitation pool stops 3h, enter hot tub.
(3) be transported to cooling tower with lift pump, the water body after the cooling tower cooling enters water cooling pond, is supplied toward each user by working shaft.
Extract working shaft water supply and detect, as calculated: the clearance of total hardness is 99.47% up to the clearance of 98%, SS, and color is colourless.
Claims (10)
1. the total hardness water treatment method of coal gas of steel-smelting revolving furnace washing water, it comprises the steps: to pass into CO in overhead chute in the coal gas of steel-smelting revolving furnace washing water that flow
2, by water-distributing well water body is dispensed to the sedimentation that settling apparatus is embodied as dirty thing, the mud in sediment and the washing water is discharged, get final product; Wherein said CO
2Consumption count 5～20mg/L according to quantity of circulating water; The flow velocity of washing water is so that described washing water and CO described in this overhead chute
2Can react more than at least 30 seconds and be as the criterion, preferably be 30～60 seconds, more preferably is 40 seconds.
2. the method for claim 1, it is characterized in that: the pH value of described coal gas of steel-smelting revolving furnace washing water is 10～13, total hardness＞800mg/L, total alkalinity＞500mg/L, suspended substance are 5000mg/L～15000mg/L.
3. method as claimed in claim 1 or 2, it is characterized in that: described settling apparatus is radiation type precipitation pool or inclined-plate clarifying basin; The quantity of described settling apparatus is more than 2, preferably is 3; In this or those radiation type precipitation pool, the residence time of described water body preferably is 1～3h, more preferably is 3h.
4. such as each described method in the claim 1～3, it is characterized in that: described CO
2Be industrial CO
2
5. the treatment process of coal gas of steel-smelting revolving furnace washing water, it comprises the steps:
(1) the coal gas of steel-smelting revolving furnace washing water that flow out from the oxygen coverter gas recovery system enter coarse particle separator through the first overhead chute, remove particle and flow in the second overhead chute after greater than the suspended impurity of 60 μ m; This first overhead chute connects this oxygen coverter gas recovery system and this coarse particle separator; This second overhead chute connects this coarse particle separator and water-distributing well;
(2) in the sewage that in this second overhead chute, flows, pass into CO
2And the interpolation organic floculant is dispensed to settling apparatus by water-distributing well with water body again and realizes suspended substance and the common flocculating settling that becomes dirty thing, and the mud in sediment and the water body is discharged; Wherein said CO
2Consumption count 5～20mg/L according to quantity of circulating water; The flow velocity of the sewage that flows in this second overhead chute is so that described sewage and CO
2And organic floculant can react more than 30 seconds be as the criterion at least, preferably is 30～60 seconds, more preferably is 40 seconds;
(3) will be transported to hot tub through step (2) treated water body, and be transported in the cooling tower again and cool;
(4) cooled water body is transported in the water cooling pond;
(5) water body in this water cooling pond is transported in the oxygen coverter gas recovery system, gets final product.
6. technique as claimed in claim 5, it is characterized in that: the pH value of described coal gas of steel-smelting revolving furnace washing water is 10～13, total hardness＞800mg/L, total alkalinity＞500mg/L, suspended substance are 5000mg/L～15000mg/L.
7. such as claim 5 or 6 described techniques, it is characterized in that: described CO
2Be industrial CO
2
8. such as each described technique in the claim 5～7, it is characterized in that: described organic floculant is polyacrylamide and/or polymerize aluminum chloride; The concentration of described organic floculant is 0.5mg/L～1.5mg/L, preferably is 0.8mg/L.
9. technique as claimed in claim 5 is characterized in that: contain dirt dispersion agent and oxidisability biocide in the described water cooling pond.
10. technique as claimed in claim 5, it is characterized in that: described settling apparatus is radiation type precipitation pool or inclined-plate clarifying basin; The quantity of described settling apparatus is more than 2, preferably is 3; In this or those radiation type precipitation pool, the residence time of described water body preferably is 1～3h, more preferably is 3h.
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|---|---|---|---|
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|---|---|---|---|
| CN201110312941.5A CN103043813B (en) | 2011-10-14 | 2011-10-14 | Method and process for treating steelmaking converter gas washing water by adopting divergent CO2 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103553246A (en) * | 2013-11-21 | 2014-02-05 | 武汉森泰环保工程有限公司 | Device and method for softening hard water by using carbon dioxide in flue gas |
| CN108793549A (en) * | 2018-05-31 | 2018-11-13 | 武汉钢铁有限公司 | Wet dedusting blast furnace gas system ammonia nitrogen waste water treatment method and its system |
| CN112062354A (en) * | 2020-09-25 | 2020-12-11 | 湖南华菱湘潭钢铁有限公司 | Method for reducing hardness of dust removal water of converter flue gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103553246A (en) * | 2013-11-21 | 2014-02-05 | 武汉森泰环保工程有限公司 | Device and method for softening hard water by using carbon dioxide in flue gas |
| CN108793549A (en) * | 2018-05-31 | 2018-11-13 | 武汉钢铁有限公司 | Wet dedusting blast furnace gas system ammonia nitrogen waste water treatment method and its system |
| CN112062354A (en) * | 2020-09-25 | 2020-12-11 | 湖南华菱湘潭钢铁有限公司 | Method for reducing hardness of dust removal water of converter flue gas |
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| CN103043813B (en) | 2014-06-25 |
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