CN103111183B - Wet desulphurization slurry blinding prevention and solution method - Google Patents
Wet desulphurization slurry blinding prevention and solution method Download PDFInfo
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- CN103111183B CN103111183B CN201310057873.1A CN201310057873A CN103111183B CN 103111183 B CN103111183 B CN 103111183B CN 201310057873 A CN201310057873 A CN 201310057873A CN 103111183 B CN103111183 B CN 103111183B
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Abstract
Wet desulphurization slurry blinding prevention and solution method, belong to thermal power plant wet desulfurization system technical field, it is characterized in that blinding prevention method comprises lime stone and also rectifies a deviation in time for starching metering needle to the chemical compositions that different ruuning situation carries out control of classifying, periodic analysis grasps slurries, take adjusting process to prevent blinding from occurring in time for poisoning blinding omen; Blinding processing method comprises rationally minimizing stock volume to be made excessive lime stone clear up and controls slurry pH value to drop to minimum limit value, and rationally increase stock volume and slurry pH value rising is recovered normally, conservative control stock volume makes desulfuration efficiency return to design load.By application of the present invention, effectively can reduce the probability that poisoning blinding accident occurs, improve the reliability and stability of desulphurization system, in time, effectively can implement process for occurred poisoning blinding accident simultaneously, system is got off quickly adverse effect caused by poisoning blinding accident, reduces the extent of injury that poisoning blinding accident is brought.
Description
Technical field
Wet desulfurization system technical field of the present invention, is specifically related to a kind of wet desulphurization slurry blinding prevention and solution method being applicable to thermal power plant wet desulfurization system.
Background technology
In power plants air contaminant treatment field, Wet Flue Gas Desulfurization Technique accounts for more than 90% of fume treatment technology after whole burning, the feature of this technique is after whole desulphurization system is positioned at dust remover for coal boiler, desulfurization project is carried out all in the solution, and according to having, reaction speed is fast, desulfuration efficiency high.Main flow is accounted for Limestone-gypsum Wet Flue Gas Desulfurization Process technology again in in-service fired power generating unit flue gas desulfurization treatment technology, early stage limestone-gypsum desulphurization system is equipped with bypath system, main frame passes through this system discharge flue gas when shutdown process or desulfurizer accident condition, but the existence of this desulfurization bypass, also steals row for power plant and creates condition.Along with the enhancing of people's environmental consciousness and the raising of national requirements for environmental protection, and for stopping the generation of row's event steathily, country puts into effect policy in succession, require to cancel desulfurization bypass, and after cancelling desulfurization bypass, the running status of desulfurizer will directly affect the normal operation of main frame, it is also proposed higher requirement to the reliability and stability of desulfurizer.Slurries poisoning blinding in absorption tower is the more common a kind of fault of desulfurizer, slurries poisoning blinding in absorption tower is the key factor affecting desulfurizer reliability and stability, particularly after cancellation desulfurization bypass, greasy dirt in Unit Commitment stage flue gas and dust enter absorption tower, add the possibility of the poisoning blinding of absorption tower slurries; Can cause after the poisoning blinding of absorption tower slurries that desulfuration efficiency declines, wastewater discharge increases, degradation unfavorable factor and affect equipment safety operation under slurry pH value, and troubleshooting is long for recovery time, generally needs the time taking 1 ~ 3 day just can complete.
The reason Main Analysis of the poisoning blinding of absorption tower slurries is as follows:
1) desulfurizer import SO
2concentration sudden change causes lime stone blind area: due to exhaust gas volumn or the former flue gas SO of desulfurizer import
2concentration is suddenlyd change, and causes reaction aggravation in absorption tower, CaCO
3content reduces, pH value declines, if now lime stone drops into as ensureing desulfuration efficiency for slurry flow automatically, automatically increases lime stone stock volume to improve the pH value on absorption tower, but due to the CaSO in the slurries of reaction aggravation absorption tower
3* 1/2H
2o content rolls up, if now do not increase oxygen amount to make CaSO
3* 1/2H
2o is reacted into CaSO rapidly
4* 2H
2o, then due to CaSO
3* 1/2H
2o resolvability is strong first soluble in water, and CaCO
3dissolve comparatively slow, form deposition of solid after supersaturation, this phenomenon is called " lime stone blind area ";
2) serum density height in absorption tower is not outer in time arranges, the CaSO in slurries
4* 2H
2o is saturated can suppress CaCO
3solubilizing reaction;
3) after electric precipitation, dust content is high or heavy metal component is high, forms a stable compound, be attached to limestone particle surface, affect the solubilizing reaction of limestone particle, cause the conciliation of lime stone slurry to pH value invalid in the slurries of absorption tower;
4) be oxidized and insufficiently cause sulphite blinding: concrete principle is with 1) item explanation;
5) fresh water (FW) water quality inferiority: the chlorine ion concentration in system is high, agstone poor quality, causes slurries generation lime stone blind area, absorption tower;
6) fluorine ion exceeds standard: the trivalent aluminium in slurries and fluorine ion reaction generate AlF
3with the complex compound of other materials, the coagulation in viscosity is attached to limestone surfaces, and this can cause: closed lime stone granulate surface stops it to dissolve, and reduces the pH value of slurries, desulfurization degree will inevitably be caused to decline; This just requires to add lime stone to regulate the pH value of slurries, if now lime stone drops into as ensureing desulfuration efficiency for slurry flow automatically, automatically increase lime stone stock volume to improve the pH value on absorption tower, thus make the lime stone that absorbs in slurries excessive, make whole system add lime stone consumption, reduce gypsum quality and destroy dehydration characteristic.
7) in slurries, greasy dirt content is high, too much greasy dirt enters absorption tower can cause foam, can impact the chemical reaction of desulfurization simultaneously, greasy dirt run up to a certain amount of after, the materials such as the carbon black in greasy dirt, hydrocarbon can be wrapped in various particle surface, affect its mass transport process, and affect gypsum crystallization and desulfuration efficiency; When the greasy dirt content in gypsum slurries reaches 250mg/m
3time, the dissolution rate of lime stone is substantially to zero, SO
2absorb chemical reaction substantially to stop.
Summary of the invention
The present invention aims to provide a kind of wet desulphurization slurry blinding prevention and solution method and technology scheme, to overcome problems of the prior art.
Described wet desulphurization slurry blinding prevention and solution method, is characterized in that:
1) wet desulphurization slurry blinding prevention method comprises the following prevention process step of employing:
1. under wet desulfurization system normal operation, lime stone supplies slurry control valve to arrange and throws control, absorption tower slurry pH value control range is automatically 5.2 ~ 5.6, preferably 5.4, in flushing pH meter and flushing densitometer process, lime stone is supplied slurry control valve to switch to Non-follow control and maintains lime stone to supply slurry control valve opening constant, when the pH meter absolute value of the bias of absorption tower slurries redundant measurement is more than 0.4 ± 0.05, lime stone switched to Non-follow control for slurry control valve, meet design load with desulfuration efficiency for according to carrying out manual adjustments, and inspections is carried out to pH meter verify;
2. regularly chemical analysis is carried out to grasp the chemical composition of absorption tower slurries in time to absorption tower slurries, selective analysis serum density and Cl ion, F ion, AL ion, CaSO
3* 1/2H
2o, CaCO
3the variation tendency of mass percent also makes it remain in corresponding control range respectively by corresponding satisfactory after correcting;
3. when lime stone has raised for slurry but absorption tower slurry pH value declines and lower than setting value under in limited time, belong to the omen of the poisoning blinding of absorption tower slurries, timely examination and analysb serum density and CaSO
3* 1/2H
2o, CaCO
3, F ion, AL ion, Cl ion mass percent whether in corresponding control range to take specific aim satisfactory after correcting, and change lime stone into manual adjustments for slurry, control absorption tower slurry pH value and slowly drop to 4.6, slowly increase the addition of lime stone slurry again, the rise speed controlling absorption tower slurry pH value is 0.05 ~ 0.1/h, when absorption tower slurry pH value returns to 5.0 ~ 5.2, lime stone is arranged throwing for slurry control valve and automatically controls.
2) wet desulphurization slurry blinding processing method comprises the following treatment process steps of employing:
1. reducing lime stone stock volume makes excessive lime stone clear up stripping, make absorption tower slurries pH slowly decline simultaneously, until pH drops to 4.6 or meet that absorption tower slurry pH value under complete shut-down is for slurry control valve 5 minutes conditions declines 0.1 ± 0.02, desulfuration efficiency declines 0.2 ± 0.02%, now substantially can judge that blinding gypsum slurries sodalime stone is close to having consumed;
2. start slowly to increase lime stone stock volume when pH drops to the 1. described extreme position for the treatment of process steps, absorption tower slurry pH value is made to rise to more than 5.0 gradually, now can judge to depart from blind area gradually, pH uphill process stock volume is that 0.05 ~ 0.1/h regulates by the rise speed of pH;
3. absorption tower slurries CaCO is detected in time after absorption tower slurry pH value rises to 5.0 ~ 5.2 gradually
3mass percent, CaCO
3mass percent substantially can determine that desulphurization system is breaking away from blind area when being less than 3.0%, 95% ~ 105% pair lime stone of lime stone stock volume by theoretical stock volume is carried out manually controlling for slurry for slurry control valve, until the pH value of absorption tower slurries returns to 5.2 ~ 5.6 normal control ranges, and desulfuration efficiency returns to design con-trol value.
Described wet desulphurization slurry blinding prevention and solution method, the prevention process step that it is characterized in that described wet desulphurization slurry blinding prevention method 2. with step 3. described in the control range of absorption tower serum density be 1120 ~ 1150 kg/m
3, absorption tower serum density is more than 1150 kg/m
3get rid of water treatment outside Shi Jinhang to reduce absorption tower serum density, drop to lower control limit 1120kg/m
3in time, stops arranging outward; The setting range of described Cl mass of ion percentage, for being not more than 20000ppm, adopting when Cl mass of ion percentage is greater than 20000ppm and strengthens wastewater discharge to reduce Cl mass of ion percentage; The mass percent of described F ion, AL ion adopts respectively when exceeding its corresponding control limit and strengthens wastewater discharge to reduce corresponding mass percent.
Described wet desulphurization slurry blinding prevention and solution method, the prevention process step that it is characterized in that described wet desulphurization slurry blinding prevention method 1. described in lime stone for slurry control valve arrange throw automatically control time lime stone stock volume be no more than by actual stock volume and the deviation of theoretical stock volume ± 5% control, avoid because lime stone stock volume is excessive or too smallly cause the life of poisoning induced blind.
Described wet desulphurization slurry blinding prevention and solution method, is characterized in that described wet desulphurization slurry blinding prevention process step and the lime stone slurry density domination described in treatment process steps are at 1200 ~ 1280 kg/m
3in, and reduce the fluctuation of lime stone slurry density, avoid because lime stone slurry density fluctuation causes lime stone stock volume inaccurate.
Described wet desulphurization slurry blinding prevention and solution method, is characterized in that the prevention process step of described wet desulphurization slurry blinding prevention method also comprises
1. ignition of the boiler mode adopts plasma or micro-oil, and cleaner puts into operation before ignition of the boiler, to reduce dust and the greasy dirt amount that the boiler startup stage enters absorption tower slurries, avoids because dust in the slurries of absorption tower and greasy dirt concentration excess cause poisoning blinding;
2., when desulphurization system starts when absorption tower is clear water completely, absorption tower gypsum slurries crystal seed should be introduced from the normal adjacent stove run, and the crystal seed total amount introduced is not less than 1/3rd of absorption tower design liquid level.
Described wet desulphurization slurry blinding prevention and solution method, is characterized in that the treatment process steps of described wet desulphurization slurry blinding processing method employing is also included in same history graphs and adds absorption tower slurry pH value, former flue gas SO
2concentration, desulfuration efficiency, unit load, boiler total blast volume, lime stone theoretical stock volume, actual stock volume, and the indication range of parameter is set to scope that is suitable, that obviously can find out variation tendency.
Described wet desulphurization slurry blinding prevention and solution method, it is characterized in that treatment process steps that described wet desulphurization slurry blinding processing method adopts also comprises to replace gypsum slurries in absorption tower continuously, adopt by the slurries of adjacent stove absorption tower quality better being squeezed into this absorption tower and carrying out absorption tower moisturizing, the replacing velocity of slurries in quickening accident absorption tower, simultaneously by the slurries on blinding absorption tower directly outer row's accident slurry tank or abandon.
Described wet desulphurization slurry blinding prevention and solution method, it is characterized in that adopting continuously during treatment process steps that described wet desulphurization slurry blinding processing method adopts 1. 30% ~ 40% of theoretical stock volume to absorption tower for slurry to maintain desulfuration efficiency, about 6 ~ 8 hours duration, described treatment process steps 2. described in the increase method of slow increase lime stone stock volume be: according to theoretical stock volume curve, gradually by treatment process steps 1. described in 30% ~ 40% theoretical stock volume be transitioned into after 45% ~ 55% theoretical stock volume and maintain 1 ~ 1.2 hour, 2 ~ 2.5 hours are maintained after being transitioned into 60% ~ 75% theoretical stock volume by 45% ~ 55% theoretical stock volume again, 95% ~ 100% theoretical stock volume such as to be transitioned into afterwards and to maintain 4 ~ 6 hours, finally be transitioned into 102% ~ 108% theoretical stock volume by 95% ~ 100% theoretical stock volume and be maintained to absorption tower slurry pH value and rise to more than 5.0.
Described wet desulphurization slurry blinding prevention and solution method, is characterized in that occurring SO in former flue gas during treatment process steps that described wet desulphurization slurry blinding processing method adopts 2.
2during mass flow fluctuation, first control absorption tower slurry pH value and stablize, adopt manual adjustment lime stone slurry control valve to control stock volume to maintain current absorption tower slurry pH value for target, treat former flue gas SO
2recover again after total flow is stable to promote absorption tower slurry pH value operation.
Described wet desulphurization slurry blinding prevention and solution method, it is characterized in that adopting continuously during treatment process steps that described wet desulphurization slurry blinding processing method adopts 1. 34% of theoretical stock volume to absorption tower for slurry to maintain desulfuration efficiency, about 6 ~ 8 hours duration; Described treatment process steps 2. according to theoretical stock volume curve, gradually by treatment process steps 1. described in 34% theoretical stock volume be transitioned into 50% theoretical stock volume and hold time 1 hour, be transitioned into 67% theoretical stock volume by 50% theoretical stock volume again and maintain 2 hours, the 100% theoretical stock volume such as to be transitioned into afterwards and to maintain 5 hours, being finally transitioned into 105% theoretical stock volume by 100% theoretical stock volume and being maintained to absorption tower slurries pH and rise to more than 5.0.。
Above-mentioned wet desulphurization slurry blinding prevention and solution method, novel, described wet desulphurization slurry blinding prevention prevention method comprises lime stone and carries out to different ruuning situation classification controls, periodic analysis grasps slurries chemical compositions for slurry metering needle and correction in time, take adjusting process to prevent blinding from occurring in time for poisoning blinding omen; Wet desulphurization slurry blinding processing method comprises first rationally minimizing lime stone stock volume to be made excessive lime stone clear up stripping and controls absorption tower slurry pH value to drop to minimum limit value, then rationally increasing lime stone stock volume makes absorption tower slurry pH value rise recovery normally, then conservative control lime stone stock volume makes desulfuration efficiency return to design load; By application of the present invention, effectively can reduce the probability that slurries poisoning blinding accident in absorption tower occurs, until effectively avoid the generation of the poisoning blinding accident of absorption tower slurries, improve the reliability and stability of desulphurization system, guarantee the safe and stable operation of desulphurization system; Poisoning blinding accident can implement to process in time, effectively for occurred absorption tower slurries simultaneously, make system can recover normal operation in a short time, degradation adverse effect under desulfuration efficiency decline caused by the poisoning blinding accident of absorption tower slurries of getting off quickly, wastewater discharge increase, plasm PH value, reduces the extent of injury that slurries poisoning blinding accident in absorption tower is brought.
Detailed description of the invention
Now describe the specific embodiment of the present invention in detail in conjunction with the embodiments:
For the analysis of causes of the poisoning blinding of absorption tower slurries, in thermal power plant wet desulfurization system runs, associated process conditions is controlled, effectively can reduce the probability that slurries poisoning blinding accident in absorption tower occurs, until effectively avoid the generation of the poisoning blinding accident of absorption tower slurries, improve the reliability and stability of desulphurization system, guarantee the safe and stable operation of desulphurization system, wet desulphurization slurry blinding prevention method comprises the following prevention process step of employing:
1. under wet desulfurization system normal operation, by ensureing to supply slurry control valve to arrange by the lime stone of absorption tower supply, throwing controls automatically, absorption tower slurry pH value control range is 5.2 ~ 5.6, preferably 5.4; At this lime stone arranged for slurry control valve and to throw in automatic control process lime stone stock volume and be no more than by actual stock volume and the deviation of theoretical stock volume ± 5% control, avoid because lime stone stock volume is excessive or the too small poisoning induced blind that causes is given birth to; PH meter, densitometer flushing process use clear water directly to clean, now truly can not reflect the pH value of absorption tower slurries, pH value generally can jump to about 7, therefore in flushing pH meter and flushing densitometer process, lime stone is supplied slurry control valve to switch to Non-follow control and maintains lime stone to supply slurry control valve opening constant, significantly stock volume is increased and decreased in order to avoid automatically regulate to cause, after pH meter, densitometer rinse and terminate, just again lime stone can be thrown for slurry control valve and automatically control; And when the pH meter absolute value of the bias of absorption tower slurries redundant measurement is more than 0.4 ± 0.05, lime stone switched to Non-follow control for slurry control valve, meet design load with desulfuration efficiency for according to carrying out manual adjustments, and inspection verification is carried out to pH meter, guarantee the correctness of lime stone for slurry control valve auto-adjustment control foundation;
2. regularly chemical analysis is carried out to grasp the chemical composition of absorption tower slurries in time to absorption tower slurries, selective analysis serum density and Cl ion, F ion, AL ion, CaSO
3* 1/2H
2o, CaCO
3the variation tendency of mass percent also makes it remain in corresponding control range respectively by corresponding satisfactory after correcting; The control range of described absorption tower serum density is 1120 ~ 1150 kg/m
3, when it is more than 1150 kg/m
3get rid of water treatment outside Shi Jinhang to reduce absorption tower serum density, drop to lower control limit 1120kg/m
3in time, stops arranging outward; The control range of described Cl mass of ion percentage, for being not more than 20000ppm, adopting when Cl mass of ion percentage is greater than 20000ppm and strengthens wastewater discharge to reduce Cl mass of ion percentage; The mass percent of described F ion, AL ion strengthens respectively when exceeding its corresponding control limit to adopt and strengthens wastewater discharge to reduce corresponding mass percent.
3. when lime stone has raised for slurry but absorption tower slurry pH value declines and lower than setting value under in limited time, belong to the omen of the poisoning blinding of absorption tower slurries, timely examination and analysb serum density and CaSO
3* 1/2H
2o, CaCO
3, F ion, AL ion, Cl ion mass percent whether in corresponding control range to take specific aim satisfactory after correcting, control range and corresponding correction control measure are with above-mentioned steps 2., change lime stone into manual adjustments for slurry simultaneously, control absorption tower slurry pH value and slowly drop to 4.6, slowly increase the addition of lime stone slurry again, the rise speed controlling absorption tower slurry pH value is 0.05 ~ 0.1/h, when absorption tower slurry pH value returns to 5.0 ~ 5.2, lime stone is arranged throwing for slurry control valve and automatically controls.
For improving the preventive effect of wet desulphurization blinding further, wet desulphurization slurry blinding prevention method, except above-mentioned technology controlling and process, also comprises:
1. ignition of the boiler mode adopts plasma or micro-oil, and cleaner puts into operation before ignition of the boiler, to reduce dust and the greasy dirt amount that the boiler startup stage enters absorption tower slurries, avoids because dust in the slurries of absorption tower and greasy dirt concentration excess cause poisoning blinding;
2. when desulphurization system starts when absorption tower is clear water completely, absorption tower gypsum slurries crystal seed should be introduced from the normal adjacent stove run, and the crystal seed total amount introduced is not less than 1/3rd of absorption tower design liquid level, with the activity to improve absorption tower slurries as early as possible, reduce desulphurization system start-up time.
Implement to process in time, effectively for the poisoning blinding accident of occurred absorption tower slurries, make system can recover normal operation in a short time, the desulfuration efficiency caused of the poisoning blinding accident of absorption tower slurries of getting off quickly declines, wastewater discharge increases, degradation adverse effect under plasm PH value, reduce the extent of injury that slurries poisoning blinding accident in absorption tower is brought, wet desulphurization slurry blinding processing method comprises the following treatment process steps of employing:
1. reducing lime stone stock volume makes excessive lime stone clear up stripping, make absorption tower slurries pH slowly decline simultaneously, until pH drops to 4.6 or meet under complete shut-down is for slurry control valve 5 minutes conditions that pH fall off rate reaches decline 0.1 ± 0.02, desulfuration efficiency declines 0.2 ± 0.02%, now substantially can judge
blindinggypsum slurries sodalime stone is close to having consumed;
2. start slowly to increase lime stone stock volume when pH drops to the 1. described extreme position for the treatment of process steps, the pH of absorption tower slurries is made to rise to more than 5.0 gradually, now can judge to depart from blind area gradually, pH uphill process stock volume is that 0.05 ~ 0.1/h regulates by the rise speed of pH; Promoting in the process of pH value at this, unit load should being kept to stablize, as there is former flue gas SO
2during mass flow fluctuation, first control absorption tower slurry pH value and stablize, adopt manual adjustment lime stone slurry control valve to control stock volume to maintain current absorption tower slurry pH value for target, treat former flue gas SO
2recover again after total flow is stable to promote absorption tower slurry pH value operation;
3. absorption tower slurries CaCO is detected in time after the pH of absorption tower slurries rises to 5.0 ~ 5.2 gradually
3mass percent, CaCO
3mass percent substantially can determine that desulphurization system is breaking away from blind area when being less than 3.0%, 95% ~ 105% pair lime stone of lime stone stock volume by theoretical stock volume is carried out manually controlling for slurry for slurry control valve, until the pH value of absorption tower slurries returns to 5.2 ~ 5.6 normal control ranges, and desulfuration efficiency is returned to design con-trol value.
1. above-mentioned wet desulphurization slurry blinding treatment process steps reduces 30% ~ 40% of the theoretical stock volume of continuous employing in pH value process and supplies slurry to maintain desulfuration efficiency to absorption tower, about 6 ~ 8 hours duration, the increase method that 2. described treatment process steps promotes the slow increase lime stone stock volume described in pH value process is: according to theoretical stock volume curve, 1 ~ 1.2 hour is maintained after being transitioned into 45% ~ 55% theoretical stock volume by 30% ~ 40% theoretical stock volume that treatment process steps is 1. described gradually, 2 ~ 2.5 hours are maintained after being transitioned into 60% ~ 75% theoretical stock volume by 45% ~ 55% theoretical stock volume again, 95% ~ 100% theoretical stock volume such as to be transitioned into afterwards and to maintain 4 ~ 6 hours, finally be transitioned into 102% ~ 108% theoretical stock volume by 95% ~ 100% theoretical stock volume and be maintained to absorption tower slurries pH and rise to more than 5.0, for improving reduction further, promoting the effect of pH value, preferred version be described treatment process steps 1. reduce in pH value process adopt continuously 34% of theoretical stock volume to absorption tower for slurry to maintain desulfuration efficiency, about 6 ~ 8 hours duration, 2. described treatment process steps promotes in pH value process according to theoretical stock volume curve, gradually by treatment process steps 1. described in 34% theoretical stock volume be transitioned into 50% theoretical stock volume and hold time 1 hour, be transitioned into 67% theoretical stock volume by 50% theoretical stock volume again and maintain 2 hours, the 100% theoretical stock volume such as to be transitioned into afterwards and to maintain 5 hours, being finally transitioned into 105% theoretical stock volume by 100% theoretical stock volume and being maintained to absorption tower slurries pH and rise to more than 5.0.
For improving wet desulphurization slurry blinding treatment effect further, wet desulphurization slurry blinding processing method, except above-mentioned technology controlling and process, also comprises:
1. in same history graphs, add absorption tower slurry pH value, former flue gas SO
2concentration, desulfuration efficiency, unit load, boiler total blast volume, lime stone theoretical stock volume, actual stock volume, and the indication range of parameter is set to scope that is suitable, that obviously can find out variation tendency;
2. right continuously
in absorption towergypsum slurries is replaced, adopt by the slurries of adjacent stove absorption tower quality better being squeezed into this absorption tower and carrying out absorption tower moisturizing, the replacing velocity of slurries in quickening accident absorption tower, simultaneously by the slurries on blinding absorption tower directly outer row's accident slurry tank or abandon, to dilute to blind slurries and to discharge absorption tower, recover the activity of absorption tower slurries as early as possible;
Described in above-mentioned wet desulphurization slurry blinding prevention and solution method, wet desulphurization slurry blinding prevention process step and the lime stone slurry density domination described in treatment process steps are at 1200 ~ 1280 kg/m
3in, and reduce the fluctuation of lime stone slurry density, avoid because lime stone slurry density fluctuation causes lime stone stock volume inaccurate; In addition in wet desulphurization slurry blinding processing procedure, the trend analysis of each chemical composition of slurries should be carried out, observe the isoparametric situation of change of desulfuration efficiency simultaneously, adopt an effective measure with timely, specific aim; Treatment process steps 1. in for judge the fall off rate of absorption tower slurry pH value and desulfuration efficiency carry out complete shut-down confession starch control valve operate time, the complete shut-down time for slurry control valve is not more than 5 minutes, to prevent lime stone quantity not sufficient in absorption tower, absorption tower slurry pH value declines and too lowly affects equipment safety operation.
Claims (9)
1. wet desulphurization slurry blinding prevention and solution method, is characterized in that:
1) wet desulphurization slurry blinding prevention method comprises the following prevention process step of employing:
1. under wet desulfurization system normal operation, lime stone supplies slurry control valve to arrange and throws control, absorption tower slurry pH value control range is automatically 5.2 ~ 5.6, in flushing pH meter and flushing densitometer process, lime stone is supplied slurry control valve to switch to Non-follow control and maintains lime stone to supply slurry control valve opening constant, when the pH meter absolute value of the bias of absorption tower slurries redundant measurement is more than 0.4, lime stone switched to Non-follow control for slurry control valve, meet design load with desulfuration efficiency for according to carrying out manual adjustments, and inspections is carried out to pH meter verify;
2. regularly chemical analysis is carried out to grasp the chemical composition of absorption tower slurries in time to absorption tower slurries, selective analysis serum density and Cl
-, F
-, Al
3+, CaSO
31/2H
2o, CaCO
3the variation tendency of mass percent also makes it remain in corresponding control range respectively by corresponding satisfactory after correcting;
3. when lime stone has raised for slurry but absorption tower slurry pH value declines and lower than setting value under in limited time, belong to the omen of the poisoning blinding of absorption tower slurries, timely examination and analysb serum density and CaSO
31/2H
2o, CaCO
3, F
-, Al
3+, Cl
-mass percent whether in corresponding control range to take specific aim satisfactory after correcting, and change lime stone into manual adjustments for slurry, control absorption tower slurry pH value and slowly drop to 4.6, slowly increase the addition of lime stone slurry again, the rise speed controlling absorption tower slurry pH value is 0.05 ~ 0.1/h, when absorption tower slurry pH value returns to 5.0 ~ 5.2, lime stone is arranged throwing for slurry control valve and automatically controls;
Above-mentioned prevention process step 2. with step 3. described in the control range of absorption tower serum density be 1120 ~ 1150 kg/m
3, absorption tower serum density is more than 1150 kg/m
3get rid of water treatment outside Shi Jinhang to reduce absorption tower serum density, drop to lower control limit 1120kg/m
3in time, stops arranging outward; Described Cl
-the setting range of mass percent for being not more than 20000ppm, Cl
-mass percent adopts when being greater than 20000ppm and strengthens wastewater discharge to reduce Cl mass of ion percentage; Described F
-, Al
3+mass percent adopt respectively when exceeding its corresponding control limit and strengthen wastewater discharge to reduce corresponding mass percent;
2) wet desulphurization slurry blinding processing method comprises the following treatment process steps of employing:
1. reducing lime stone stock volume makes excessive lime stone clear up stripping, make absorption tower slurries pH slowly decline simultaneously, until pH drops to 4.6 or meet that absorption tower slurry pH value under complete shut-down is for slurry control valve 5 minutes conditions declines 0.1 ± 0.02, desulfuration efficiency declines 0.2 ± 0.02%, now substantially can judge that blinding gypsum slurries sodalime stone is close to having consumed;
2. start slowly to increase lime stone stock volume when pH drops to the 1. described extreme position for the treatment of process steps, absorption tower slurry pH value is made to rise to more than 5.0 gradually, now can judge to depart from blind area gradually, pH uphill process stock volume is that 0.05 ~ 0.1/h regulates by the rise speed of pH;
3. absorption tower slurries CaCO is detected in time after absorption tower slurry pH value rises to 5.0 ~ 5.2 gradually
3mass percent, CaCO
3mass percent substantially can determine that desulphurization system is breaking away from blind area when being less than 3.0%, 95% ~ 105% pair lime stone of lime stone stock volume by theoretical stock volume is carried out manually controlling for slurry for slurry control valve, until the pH value of absorption tower slurries returns to 5.2 ~ 5.6 normal control ranges, and desulfuration efficiency returns to design con-trol value;
Above-mentioned treatment process steps 1. in adopt continuously 30% ~ 40% of theoretical stock volume to absorption tower for slurry to maintain desulfuration efficiency, about 6 ~ 8 hours duration, described treatment process steps 2. described in the increase method of slow increase lime stone stock volume be: according to theoretical stock volume curve, gradually by treatment process steps 1. described in 30% ~ 40% theoretical stock volume be transitioned into after 45% ~ 55% theoretical stock volume and maintain 1 ~ 1.2 hour, 2 ~ 2.5 hours are maintained after being transitioned into 60% ~ 75% theoretical stock volume by 45% ~ 55% theoretical stock volume again, be transitioned into 95% ~ 100% theoretical stock volume afterwards and maintain 4 ~ 6 hours, finally be transitioned into 102% ~ 108% theoretical stock volume by 95% ~ 100% theoretical stock volume and be maintained to absorption tower slurry pH value and rise to more than 5.0.
2. wet desulphurization slurry blinding prevention and solution method as claimed in claim 1, the prevention process step that it is characterized in that described wet desulphurization slurry blinding prevention method 1. described in lime stone for slurry control valve arrange throw automatically control time lime stone stock volume be no more than by actual stock volume and the deviation of theoretical stock volume ± 5% control, avoid because lime stone stock volume is excessive or too smallly cause the life of poisoning induced blind.
3. wet desulphurization slurry blinding prevention and solution method as claimed in claim 1, is characterized in that described wet desulphurization slurry blinding prevention process step and the lime stone slurry density domination described in treatment process steps are at 1200 ~ 1280 kg/m
3in, and reduce the fluctuation of lime stone slurry density, avoid because lime stone slurry density fluctuation causes lime stone stock volume inaccurate.
4. wet desulphurization slurry blinding prevention and solution method as claimed in claim 1, is characterized in that the prevention process step of described wet desulphurization slurry blinding prevention method also comprises
1. ignition of the boiler mode adopts plasma or micro-oil, and cleaner puts into operation before ignition of the boiler, to reduce dust and the greasy dirt amount that the boiler startup stage enters absorption tower slurries, avoids because dust in the slurries of absorption tower and greasy dirt concentration excess cause poisoning blinding;
2., when desulphurization system starts when absorption tower is clear water completely, absorption tower gypsum slurries crystal seed should be introduced from the normal adjacent stove run, and the crystal seed total amount introduced is not less than 1/3rd of absorption tower design liquid level.
5. wet desulphurization slurry blinding prevention and solution method as claimed in claim 1, is characterized in that the treatment process steps of described wet desulphurization slurry blinding processing method employing is also included in same history graphs and adds absorption tower slurry pH value, former flue gas SO
2concentration, desulfuration efficiency, unit load, boiler total blast volume, lime stone theoretical stock volume, actual stock volume, and the indication range of parameter is set to scope that is suitable, that obviously can find out variation tendency.
6. wet desulphurization slurry blinding prevention and solution method as claimed in claim 1, it is characterized in that treatment process steps that described wet desulphurization slurry blinding processing method adopts also comprises to replace gypsum slurries in absorption tower continuously, adopt by the slurries of adjacent stove absorption tower quality better being squeezed into this absorption tower and carrying out absorption tower moisturizing, the replacing velocity of slurries in quickening accident absorption tower, simultaneously by the slurries on blinding absorption tower directly outer row's accident slurry tank or abandon.
7. wet desulphurization slurry blinding prevention and solution method as claimed in claim 1, to is characterized in that during treatment process steps that described wet desulphurization slurry blinding processing method adopts 2. SO in the former flue gas of appearance
2during mass flow fluctuation, first control absorption tower slurry pH value and stablize, adopt manual adjustment lime stone slurry control valve to control stock volume to maintain current absorption tower slurry pH value for target, treat former flue gas SO
2recover again after total flow is stable to promote absorption tower slurry pH value operation.
8. wet desulphurization slurry blinding prevention and solution method as claimed in claim 1, it is characterized in that adopting continuously during treatment process steps that described wet desulphurization slurry blinding processing method adopts 1. 34% of theoretical stock volume to absorption tower for slurry to maintain desulfuration efficiency, about 6 ~ 8 hours duration; Described treatment process steps 2. according to theoretical stock volume curve, gradually by treatment process steps 1. described in 34% theoretical stock volume be transitioned into 50% theoretical stock volume and hold time 1 hour, be transitioned into 67% theoretical stock volume by 50% theoretical stock volume again and maintain 2 hours, be transitioned into 100% theoretical stock volume afterwards and maintain 5 hours, being finally transitioned into 105% theoretical stock volume by 100% theoretical stock volume and being maintained to absorption tower slurry pH value and rise to more than 5.0.
9. wet desulphurization slurry blinding prevention and solution method as claimed in claim 1, is characterized in that the controlling value for the treatment of process steps that described wet desulphurization slurry blinding prevention method adopts 1. middle absorption tower slurry pH value is 5.4.
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| US11161075B2 (en) | 2017-09-12 | 2021-11-02 | General Electric Company | System and method for optimized operation of flue gas desulfurization unit |
| CN109555971B (en) * | 2019-01-15 | 2024-01-30 | 新乡市新平航空机械有限公司 | Concentrator pipeline system and control flow thereof |
| CN112107977A (en) * | 2020-09-29 | 2020-12-22 | 聂鹏飞 | Automatic pH value adjusting method, system and device based on desulfurization system |
| CN113750796A (en) * | 2021-08-06 | 2021-12-07 | 华能应城热电有限责任公司 | Method for recovering activity of limestone-gypsum wet flue gas desulfurization slurry |
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