CN103111183A - Desulfurized slurry blinding prevention and treatment methods employing wet process - Google Patents
Desulfurized slurry blinding prevention and treatment methods employing wet process Download PDFInfo
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- CN103111183A CN103111183A CN2013100578731A CN201310057873A CN103111183A CN 103111183 A CN103111183 A CN 103111183A CN 2013100578731 A CN2013100578731 A CN 2013100578731A CN 201310057873 A CN201310057873 A CN 201310057873A CN 103111183 A CN103111183 A CN 103111183A
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- 239000002002 slurry Substances 0.000 title claims abstract description 251
- 238000000034 method Methods 0.000 title claims abstract description 92
- 230000002265 prevention Effects 0.000 title claims abstract description 48
- 235000019738 Limestone Nutrition 0.000 claims abstract description 95
- 239000006028 limestone Substances 0.000 claims abstract description 95
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 45
- 231100000572 poisoning Toxicity 0.000 claims abstract description 31
- 230000000607 poisoning effect Effects 0.000 claims abstract description 31
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000023556 desulfurization Effects 0.000 claims abstract description 17
- 239000003546 flue gas Substances 0.000 claims abstract description 17
- 238000004458 analytical method Methods 0.000 claims abstract description 11
- 238000013461 design Methods 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 9
- 238000010521 absorption reaction Methods 0.000 claims description 144
- 238000003672 processing method Methods 0.000 claims description 40
- 150000002500 ions Chemical class 0.000 claims description 33
- 210000002966 serum Anatomy 0.000 claims description 15
- 239000010440 gypsum Substances 0.000 claims description 14
- 229910052602 gypsum Inorganic materials 0.000 claims description 14
- 239000000428 dust Substances 0.000 claims description 9
- 239000002351 wastewater Substances 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000003020 moisturizing effect Effects 0.000 claims description 3
- 238000003359 percent control normalization Methods 0.000 claims description 3
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 7
- 208000027418 Wounds and injury Diseases 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 3
- 208000014674 injury Diseases 0.000 abstract description 3
- 230000000737 periodic effect Effects 0.000 abstract description 2
- 201000004569 Blindness Diseases 0.000 abstract 5
- 239000004615 ingredient Substances 0.000 abstract 1
- 239000002243 precursor Substances 0.000 abstract 1
- 239000000460 chlorine Substances 0.000 description 10
- 230000001276 controlling effect Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009955 starching Methods 0.000 description 2
- 206010067484 Adverse reaction Diseases 0.000 description 1
- 229910016569 AlF 3 Inorganic materials 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
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- 239000008187 granular material Substances 0.000 description 1
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- -1 if this moment Substances 0.000 description 1
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- 230000003381 solubilizing effect Effects 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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Abstract
The invention discloses desulfurized slurry blinding prevention and treatment methods employing a wet process, and belongs to the technical field of a wet flue-gas desulfurization system of a thermal power plant. The blinding prevention method is characterized by comprising the steps of carrying out classification control and periodic analysis aiming at different running conditions in limestone slurry supply adjustment to grasp the chemical ingredient of the slurry and correct deviation timely; and timely adopting an adjusting technology to prevent blinding aiming at the poisoning blindness precursor; and the blinding treatment method comprises the steps of reasonably reducing the slurry supply amount to digest excessive limestone and control the pH value of the slurry to reduce to the lowest threshold; reasonably increasing the slurry supply amount to ascend and restore the pH value of the slurry; and reasonably controlling the slurry supply amount to restore the desulphurization efficiency to a design value. By application of the methods, the probability of poisoning blindness accidents can be effectively reduced; the reliability and the stability of the desulphurization system are improved; meanwhile, the treatment can be timely and effectively carried out aiming at the poisoning blindness accidents, so that the system can rapidly get rid of adverse effects caused by the poisoning blindness accidents; and the extent of injury caused by the poisoning blindness accidents can be reduced.
Description
Technical field
Wet desulfurization system technical field of the present invention is specifically related to a kind of prevention of wet desulphurization slurries blinding and processing method that is applicable to the 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 flue gas treatment technology after whole burning, the characteristics of this technique are after whole desulphurization system is positioned at dust remover for coal boiler, desulfurization project is all carried out in solution, and reaction speed is fast according to having, the desulfuration efficiency high.Account for main flow with the 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 discharges flue gas by this system when shutdown process or desulfurizer accident condition, but the existence of this desulfurization bypass is also stolen row for power plant and has been created condition.Along with the enhancing of people's environmental consciousness and the raising of national requirements for environmental protection, and the generation for stopping the event of arranging steathily, country puts into effect policy in succession, require to cancel the desulfurization bypass, and after cancelling the desulfurization bypass, the running status of desulfurizer will directly affect the normal operation of main frame, and the reliability and stability of desulfurizer are also had higher requirement.Slurries poisoning blinding in absorption tower is the more common a kind of fault of desulfurizer, slurries poisoning blinding in absorption tower is a key factor that affects the desulfurizer reliability and stability, particularly after cancelling the desulfurization bypass, greasy dirt and dust in Unit Commitment stage flue gas enter the absorption tower, have increased the possibility of the poisoning blindings of absorption tower slurries; Can cause degradation unfavorable factor under desulfuration efficiency decline, wastewater discharge increase, slurry pH value after the poisoning blinding of absorption tower slurries and affect equipment safety operation, and troubleshooting is long recovery time, generally need to take the time of 1～3 day and 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 the lime stone blind area: due to exhaust gas volumn or the former flue gas SO of desulfurizer import
2The concentration sudden change causes absorption tower internal reaction aggravation, CaCO
3Content minimizing, the decline of pH value, if this moment, lime stone increased the lime stone stock volume with the pH value on raising absorption tower for starching the automatic input of flow automatically for guaranteeing desulfuration efficiency, but owing to reacting the CaSO that aggravates in the slurries of absorption tower
3* 1/2H
2O content rolls up, and does not make CaSO if do not increase oxygen-adding amount this moment
3* 1/2H
2O is reacted into rapidly CaSO
4* 2H
2O is due to CaSO
3* 1/2H
2The O resolvability is strong first soluble in water, and CaCO
3Dissolve slowlyer, form deposition of solid after supersaturation, this phenomenon is called " lime stone blind area ";
2) serum density height in absorption tower does not in time efflux, the CaSO in slurries
4* 2H
2O is saturated can suppress CaCO
3Solubilizing reaction;
3) after electric precipitation, dust content is high or the heavy metal composition is high, forms a stable compound in the slurries of absorption tower, is attached to the limestone particle surface, affects the solubilizing reaction of limestone particle, causes lime stone slurry invalid to the conciliation of pH value;
4) the insufficient sulphite blinding that causes of oxidation: concrete principle is with 1) explanation;
5) fresh water (FW) water quality inferiority: the chlorine ion concentration in system is high, and the 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 that is viscosity is attached to limestone surfaces, and this can cause: it dissolves the surface prevention of closed lime stone granulate, has reduced the pH value of slurries, will inevitably cause desulfurization degree to descend; This just requires to add the pH value that lime stone is regulated slurries, if this moment, lime stone dropped into as guaranteeing that desulfuration efficiency increases the lime stone stock volume automatically to improve the pH value on absorption tower automatically for the slurry flow, thereby make the lime stone that absorbs in slurries excessive, make whole system increased lime stone consumption, reduced gypsum quality and destroyed dehydration characteristic.
7) in slurries, greasy dirt content is high, too much greasy dirt enters the 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 surfaces, affect its mass transport process, and affect gypsum crystallization and desulfuration efficiency; Greasy dirt content in gypsum slurries reaches 250mg/m
3The time, the dissolution rate of lime stone arrives zero substantially, SO
2Absorbing chemical reaction stops substantially.
Summary of the invention
The present invention aims to provide a kind of wet desulphurization slurries blinding prevention and processing method technical scheme, to overcome problems of the prior art.
Described wet desulphurization slurries blinding prevention and processing method is characterized in that:
1) wet desulphurization slurries blinding prevention method comprises the following prevention process step of employing:
1. under the wet desulfurization system normal operation, lime stone supplies the slurry control valve to arrange and throws automatic control, absorption tower slurry pH value control range is 5.2～5.6, preferred 5.4, rinsing pH meter and rinsing in the densitometer process switches to manual control and keeps lime stone lime stone constant for the slurry control valve opening for the slurry control valve, the pH meter absolute value of the bias of absorption tower slurries redundant measurement surpasses at 0.4 ± 0.05 o'clock to be switched to lime stone manual control, satisfies design load as according to carrying out manual adjustments take desulfuration efficiency for the slurry control valve, and pH meter is checked verification;
2. regularly the absorption tower slurries are carried out chemical analysis with the chemical composition of timely grasp 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 remains on respectively in corresponding control range it by corresponding satisfactory after correcting;
3. raised for slurry when lime stone but the absorption tower slurry pH value descends and in limited time lower lower than setting value, belonged to the omen of the poisoning blinding of absorption tower slurries, in time detected and analyze 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 the specific aim satisfactory after correcting, and change lime stone into manual adjustments for slurry, control absorption tower slurry pH value slow decreasing to 4.6, slowly increase again the addition of lime stone slurry, the rise speed of control absorption tower slurry pH value is 0.05～0.1/h, and the absorption tower slurry pH value returns at 5.0～5.2 o'clock lime stone is arranged throwing control automatically for the slurry control valve.
2) wet desulphurization slurries blinding processing method comprises the following treatment process steps of employing:
1. reducing the lime stone stock volume makes excessive lime stone clear up stripping, make simultaneously absorption tower slurries pH slow decreasing, until pH drop to 4.6 or satisfy complete shut-down for 5 minutes conditions of slurry control valve under the absorption tower slurry pH value descend 0.1 ± 0.02, desulfuration efficiency descends 0.2 ± 0.02%, substantially can judge that blinding gypsum slurries sodalime stone approaches this moment to have consumed;
2. when dropping to treatment process steps, pH 1. begins slowly to increase the lime stone stock volume during described extreme position, make the absorption tower slurry pH value rise to gradually more than 5.0, can judge this moment to break away from gradually the blind area, pH uphill process stock volume is that 0.05～0.1/h regulates by the rise speed of pH;
3. the absorption tower slurry pH value rises to 5.0～5.2 rear timely detection absorption tower slurries CaCO gradually
3Mass percent, CaCO
3Mass percent can substantially determine that desulphurization system breaking away from the blind area less than 3.0% the time, 95%～105% pair lime stone of lime stone stock volume by theoretical stock volume carried out manually controlling for slurry for the 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 the design controlling value.
The prevention of described wet desulphurization slurries blinding and processing method, the prevention process step that it is characterized in that described wet desulphurization slurries blinding prevention method 2. with step 3. described in the control range of absorption tower serum density be 1120～1150 kg/m
3, the absorption tower serum density surpasses 1150 kg/m
3Shi Jinhang effluxes processed to reduce the absorption tower serum density, drops to lower control limit 1120kg/m
3In time, stop effluxing; The setting range of described Cl mass of ion percentage is for being not more than 20000ppm, and Cl mass of ion percentage adopts during 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 slurries blinding prevention and processing method, the prevention process step that it is characterized in that described wet desulphurization slurries blinding prevention method 1. described in lime stone arrange for the slurry control valve and throw lime stone stock volume when automatically controlling and be no more than ± 5% control by the deviation of actual stock volume and theoretical stock volume, avoid excessive because of the lime stone stock volume or the too small poisoning induced blind that causes is living.
Described wet desulphurization slurries blinding prevention and processing method is characterized in that the lime stone slurry density described in described wet desulphurization slurries blinding prevention process step and treatment process steps is controlled at 1200～1280 kg/m
3In, and the fluctuation of minimizing lime stone slurry density, avoid causing the lime stone stock volume inaccurate because of the lime stone slurry density fluctuation.
Described wet desulphurization slurries blinding prevention and processing method is characterized in that the prevention process step of described wet desulphurization slurries blinding prevention method also comprises
1. ignition of the boiler mode adopts plasma or little 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 the absorption tower slurries, avoids causing poisoning blinding because of dust in the slurries of absorption tower and greasy dirt concentration excess;
2. desulphurization system in the situation that the absorption tower is clear water fully when starting, should introduce absorption tower gypsum slurries crystal seed from the adjacent stove of normal operation, and the crystal seed total amount of introducing is not less than 1/3rd of absorption tower design liquid level.
The prevention of described wet desulphurization slurries blinding and processing method is characterized in that treatment process steps that described wet desulphurization slurries blinding processing method adopts also is included in and add absorption tower slurry pH value, former flue gas SO in same history graphs
2Concentration, desulfuration efficiency, unit load, boiler total blast volume, the theoretical stock volume of lime stone, actual stock volume, and the indication range of parameter is set to scope suitable, that can obviously find out variation tendency.
Described wet desulphurization slurries blinding prevention and processing method, it is characterized in that treatment process steps that described wet desulphurization slurries blinding processing method adopts also comprises continuously replaces gypsum slurries in the absorption tower, employing is by squeezing into the slurries of adjacent stove absorption tower quality better this absorption tower and carry out the absorption tower moisturizing, the replacing velocity of slurries in quickening accident absorption tower, the slurries with the blinding absorption tower directly efflux the accident slurry tank or abandon simultaneously.
described wet desulphurization slurries blinding prevention and processing method, it is characterized in that adopting continuously during treatment process steps that described wet desulphurization slurries blinding processing method adopts 1. theoretical stock volume 30%～40% to the absorption tower for slurry to keep desulfuration efficiency, approximately 6～8 hours duration, the increase method of the slow increase lime stone stock volume of described treatment process steps described in 2. is: according to theoretical stock volume curve, 1. kept 1～1.2 hour after 30%～40% theoretical stock volume described in is transitioned into 45%～55% theoretical stock volume by treatment process steps gradually, kept 2～2.5 hours after being transitioned into 60%～75% theoretical stock volume by 45%～55% theoretical stock volume again, 95%～100% theoretical stock volume such as be transitioned into afterwards and kept 4～6 hours, be transitioned into 102%～108% theoretical stock volume and be maintained to the absorption tower slurry pH value by 95%～100% theoretical stock volume at last and rise to more than 5.0.
The prevention of described wet desulphurization slurries blinding and processing method is characterized in that SO in former flue gas occurring during treatment process steps that described wet desulphurization slurries blinding processing method adopts 2.
2During the mass flow fluctuation, first control the absorption tower slurry pH value stable, stock volume is controlled as target adopts manual adjustment lime stone slurry control valve to keep current absorption tower slurry pH value, treat former flue gas SO
2Recover again to promote absorption tower slurry pH value operation after total flow is stable.
Described wet desulphurization slurries blinding prevention and processing method, it is characterized in that adopting continuously during treatment process steps that described wet desulphurization slurries blinding processing method adopts 1. theoretical stock volume 34% to the absorption tower for slurry to keep desulfuration efficiency, approximately 6～8 hours duration; Described treatment process steps 2. according to theoretical stock volume curve, 1. 34% theoretical stock volume described in is transitioned into 50% theoretical stock volume and held time 1 hour by treatment process steps gradually, be transitioned into 67% theoretical stock volume and kept 2 hours by 50% theoretical stock volume again, the 100% theoretical stock volume such as be transitioned into afterwards and kept 5 hours, being transitioned into 105% theoretical stock volume and being maintained to absorption tower slurries pH by 100% theoretical stock volume at last and rise to more than 5.0.。
The above-mentioned prevention of wet desulphurization slurries blinding and processing method, novel, described wet desulphurization slurries blinding prevention prevention method comprises that lime stone carries out classification is controlled, periodic analysis is grasped slurries chemical composition and in time correction, in time takes adjusting process to prevent that blinding from occuring for poisoning blinding omen different ruuning situations for the slurry metering needle; Wet desulphurization slurries blinding processing method comprises that at first rationally reducing the lime stone stock volume makes excessive lime stone clear up stripping and control the absorption tower slurry pH value and drop to minimum limit value, then rationally increase the lime stone stock volume and make the absorption tower slurry pH value increase to recover normal, more rationally control the lime stone stock volume and make desulfuration efficiency return to design load; By application of the present invention, can effectively 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; Can implement in time, effectively process for the poisoning blinding accident of the absorption tower slurries that occur simultaneously, make system can recover in a short time normal operation, degradation adverse effect under the caused desulfuration efficiency decline of the poisoning blinding accident of the 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.
The specific embodiment
Now describe in conjunction with the embodiments the specific embodiment of the present invention in detail:
The analysis of causes for the poisoning blinding of absorption tower slurries, associated process conditions is controlled the thermal power plant wet desulfurization system is in service, can effectively 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 slurries blinding prevention method comprises the following prevention process step of employing:
1. control, absorption tower slurry pH value control range are 5.2～5.6, preferred 5.4 automatically will to guarantee for the slurry control valve, throwing to be set by the lime stone of supplying on the absorption tower under the wet desulfurization system normal operation; At this, lime stone is arranged lime stone stock volume in throwing automatic control process for the slurry control valve and be no more than ± 5% control by the deviation of actual stock volume and theoretical stock volume, avoid excessive because of the lime stone stock volume or too smallly cause the life of poisoning induced blind; PH meter, densitometer flushing process use clear water directly to clean, can not truly reflect the pH value of absorption tower slurries this moment, the pH value generally can jump to 7 left and right, therefore rinsing pH meter and rinsing in the densitometer process switches to manual control and keeps lime stone lime stone constant for the slurry control valve opening for the slurry control valve, in order to avoid causing, automatic adjusting significantly increases and decreases stock volume, after pH meter, densitometer rinse end, just can again lime stone be thrown control automatically for the slurry control valve; And when the pH meter absolute value of the bias of absorption tower slurries redundant measurement surpasses 0.4 ± 0.05, lime stone is switched to manual control, satisfies design load as according to carrying out manual adjustments take desulfuration efficiency for the slurry control valve, and pH meter is checked verification, guarantee that lime stone is for the correctness of slurry control valve auto-adjustment control foundation;
2. regularly the absorption tower slurries are carried out chemical analysis with the chemical composition of timely grasp 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 remains on respectively in corresponding control range it by corresponding satisfactory after correcting; The control range of described absorption tower serum density is 1120～1150 kg/m
3, when it surpasses 1150 kg/m
3Shi Jinhang effluxes processed to reduce the absorption tower serum density, drops to lower control limit 1120kg/m
3In time, stop effluxing; The control range of described Cl mass of ion percentage is for being not more than 20000ppm, and Cl mass of ion percentage adopts during 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. raised for slurry when lime stone but the absorption tower slurry pH value descends and in limited time lower lower than setting value, belonged to the omen of the poisoning blinding of absorption tower slurries, in time detected and analyze 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 the specific aim satisfactory after correcting, control range and corresponding correction control measure are with above-mentioned step 2., change lime stone into manual adjustments for slurry simultaneously, control absorption tower slurry pH value slow decreasing to 4.6, slowly increase again the addition of lime stone slurry, the rise speed of control absorption tower slurry pH value is 0.05～0.1/h, and the absorption tower slurry pH value returns at 5.0～5.2 o'clock lime stone is arranged throwing control automatically for the slurry control valve.
For further improving the preventive effect of wet desulphurization blinding, wet desulphurization slurries blinding prevention method also comprises except above-mentioned technology controlling and process:
1. ignition of the boiler mode adopts plasma or little 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 the absorption tower slurries, avoids causing poisoning blinding because of dust in the slurries of absorption tower and greasy dirt concentration excess;
2. desulphurization system is in the situation that the absorption tower is clear water fully when starting, should introduce absorption tower gypsum slurries crystal seed from the adjacent stove of normal operation, and the crystal seed total amount of introducing is not less than 1/3rd of absorption tower design liquid level, with improving as early as possible the activity of absorption tower slurries, reduce desulphurization system start-up time.
Implement in time, effectively process for the poisoning blinding accident of the absorption tower slurries that occur, make system can recover in a short time normal operation, degradation adverse effect under the desulfuration efficiency that the causes decline of the poisoning blinding accident of absorption tower slurries of getting off quickly, wastewater discharge increase, plasm PH value, reduce the extent of injury that slurries poisoning blinding accident in absorption tower is brought, wet desulphurization slurries blinding processing method comprises the following treatment process steps of employing:
1. reducing the lime stone stock volume makes excessive lime stone clear up stripping, make simultaneously absorption tower slurries pH slow decreasing, until pH drop to 4.6 or satisfy complete shut-down for 5 minutes conditions of slurry control valve under the pH fall off rate reach descend 0.1 ± 0.02, desulfuration efficiency descends 0.2 ± 0.02%, substantially can judge this moment
BlindingGypsum slurries sodalime stone approaches and has consumed;
2. when dropping to treatment process steps, pH 1. begins slowly to increase the lime stone stock volume during described extreme position, make the pH of absorption tower slurries rise to gradually more than 5.0, can judge this moment to break away from gradually the blind area, pH uphill process stock volume is that 0.05～0.1/h regulates by the rise speed of pH; Promote in the process of pH value at this, should keep unit load stable, as former flue gas SO occur
2During the mass flow fluctuation, first control the absorption tower slurry pH value stable, stock volume is controlled as target adopts manual adjustment lime stone slurry control valve to keep current absorption tower slurry pH value, treat former flue gas SO
2Recover again to promote absorption tower slurry pH value operation after total flow is stable;
3. the pH of absorption tower slurries rises to 5.0～5.2 rear timely detection absorption tower slurries CaCO gradually
3Mass percent, CaCO
3Mass percent can substantially determine that desulphurization system breaking away from the blind area less than 3.0% the time, 95%～105% pair lime stone of lime stone stock volume by theoretical stock volume carried out manually controlling for slurry for the 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 the design controlling value.
1. above-mentioned wet desulphurization slurries blinding treatment process steps reduces in pH value process 30%～40% of the theoretical stock volume of employing starches to keep desulfuration efficiency, approximately 6～8 hours duration to the absorption tower confession continuously, 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, gradually by treatment process steps 1. described 30%～40% theoretical stock volume kept 1～1.2 hour after being transitioned into 45%～55% theoretical stock volume, kept 2～2.5 hours after being transitioned into 60%～75% theoretical stock volume by 45%～55% theoretical stock volume again, 95%～100% theoretical stock volume such as be transitioned into afterwards and kept 4～6 hours, be transitioned into 102%～108% theoretical stock volume and be maintained to absorption tower slurries pH by 95%～100% theoretical stock volume at last and rise to more than 5.0, be further to improve the effect that reduces, promotes pH value, preferred version be described treatment process steps 1. reduce adopt continuously in pH value process theoretical stock volume 34% to the absorption tower for starching to keep desulfuration efficiency, approximately 6～8 hours duration, 2. described treatment process steps promotes in pH value process according to theoretical stock volume curve, 1. 34% theoretical stock volume described in is transitioned into 50% theoretical stock volume and held time 1 hour by treatment process steps gradually, be transitioned into 67% theoretical stock volume and kept 2 hours by 50% theoretical stock volume again, the 100% theoretical stock volume such as be transitioned into afterwards and kept 5 hours, being transitioned into 105% theoretical stock volume and being maintained to absorption tower slurries pH by 100% theoretical stock volume at last and rise to more than 5.0.
For further improving wet desulphurization slurries blinding treatment effect, wet desulphurization slurries blinding processing method also comprises except above-mentioned technology controlling and process:
1. add absorption tower slurry pH value, former flue gas SO in same history graphs
2Concentration, desulfuration efficiency, unit load, boiler total blast volume, the theoretical stock volume of lime stone, actual stock volume, and the indication range of parameter is set to scope suitable, that can obviously find out variation tendency;
2. right continuously
In the absorption towerGypsum slurries is replaced, employing is by squeezing into the slurries of adjacent stove absorption tower quality better this absorption tower and carry out the absorption tower moisturizing, the replacing velocity of slurries in quickening accident absorption tower, slurries with the blinding absorption tower directly efflux the accident slurry tank or abandon simultaneously, with to diluting and discharge the absorption tower to blind slurries, recover as early as possible the activity of absorption tower slurries;
Described in above-mentioned wet desulphurization slurries blinding prevention and processing method, the lime stone slurry density described in wet desulphurization slurries blinding prevention process step and treatment process steps is controlled at 1200～1280 kg/m
3In, and the fluctuation of minimizing lime stone slurry density, avoid causing the lime stone stock volume inaccurate because of the lime stone slurry density fluctuation; In wet desulphurization slurries blinding processing procedure, should carry out the trend analysis of each chemical composition of slurries in addition, observe simultaneously the isoparametric situation of change of desulfuration efficiency, adopt an effective measure with timely, specific aim; Treatment process steps is carried out complete shut-down when operating for the slurry control valve for the fall off rate of judgement absorption tower slurry pH value and desulfuration efficiency in 1., the complete shut-down time for the slurry control valve is not more than 5 minutes, to prevent lime stone quantity not sufficient in the absorption tower, the too low equipment safety operation that affects of absorption tower slurry pH value decline.
Claims (10)
1. wet desulphurization slurries blinding prevents and processing method, it is characterized in that:
1) wet desulphurization slurries blinding prevention method comprises the following prevention process step of employing:
1. under the wet desulfurization system normal operation, lime stone supplies the slurry control valve to arrange and throws automatic control, absorption tower slurry pH value control range is 5.2～5.6, preferred 5.4, rinsing pH meter and rinsing in the densitometer process switches to manual control and keeps lime stone lime stone constant for the slurry control valve opening for the slurry control valve, the pH meter absolute value of the bias of absorption tower slurries redundant measurement surpasses at 0.4 ± 0.05 o'clock to be switched to lime stone manual control, satisfies design load as according to carrying out manual adjustments take desulfuration efficiency for the slurry control valve, and pH meter is checked verification;
2. regularly the absorption tower slurries are carried out chemical analysis with the chemical composition of timely grasp 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 remains on respectively in corresponding control range it by corresponding satisfactory after correcting;
3. raised for slurry when lime stone but the absorption tower slurry pH value descends and in limited time lower lower than setting value, belonged to the omen of the poisoning blinding of absorption tower slurries, in time detected and analyze 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 the specific aim satisfactory after correcting, and change lime stone into manual adjustments for slurry, control absorption tower slurry pH value slow decreasing to 4.6, slowly increase again the addition of lime stone slurry, the rise speed of control absorption tower slurry pH value is 0.05～0.1/h, and the absorption tower slurry pH value returns at 5.0～5.2 o'clock lime stone is arranged throwing control automatically for the slurry control valve;
2) wet desulphurization slurries blinding processing method comprises the following treatment process steps of employing:
1. reducing the lime stone stock volume makes excessive lime stone clear up stripping, make simultaneously absorption tower slurries pH slow decreasing, until pH drop to 4.6 or satisfy complete shut-down for 5 minutes conditions of slurry control valve under the absorption tower slurry pH value descend 0.1 ± 0.02, desulfuration efficiency descends 0.2 ± 0.02%, substantially can judge this moment
BlindingGypsum slurries sodalime stone approaches and has consumed;
2. when dropping to treatment process steps, pH 1. begins slowly to increase the lime stone stock volume during described extreme position, make the absorption tower slurry pH value rise to gradually more than 5.0, can judge this moment to break away from gradually the blind area, pH uphill process stock volume is that 0.05～0.1/h regulates by the rise speed of pH;
3. the absorption tower slurry pH value rises to 5.0～5.2 rear timely detection absorption tower slurries CaCO gradually
3Mass percent, CaCO
3Mass percent can substantially determine that desulphurization system breaking away from the blind area less than 3.0% the time, 95%～105% pair lime stone of lime stone stock volume by theoretical stock volume carried out manually controlling for slurry for the 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 the design controlling value.
2. wet desulphurization slurries blinding as claimed in claim 1 prevention and processing method, the prevention process step that it is characterized in that described wet desulphurization slurries blinding prevention method 2. with step 3. described in the control range of absorption tower serum density be 1120～1150 kg/m
3, the absorption tower serum density surpasses 1150 kg/m
3Shi Jinhang effluxes processed to reduce the absorption tower serum density, drops to lower control limit 1120kg/m
3In time, stop effluxing; The setting range of described Cl mass of ion percentage is for being not more than 20000ppm, and Cl mass of ion percentage adopts during 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.
3. wet desulphurization slurries blinding as claimed in claim 1 prevents and processing method, the prevention process step that it is characterized in that described wet desulphurization slurries blinding prevention method 1. described in lime stone arrange for the slurry control valve and throw lime stone stock volume when automatically controlling and be no more than ± 5% control by the deviation of actual stock volume and theoretical stock volume, avoid excessive because of the lime stone stock volume or the too small poisoning induced blind that causes is living.
4. wet desulphurization slurries blinding prevention as claimed in claim 1 and processing method, is characterized in that the lime stone slurry density described in described wet desulphurization slurries blinding prevention process step and treatment process steps is controlled at 1200～1280 kg/m
3In, and the fluctuation of minimizing lime stone slurry density, avoid causing the lime stone stock volume inaccurate because of the lime stone slurry density fluctuation.
5. wet desulphurization slurries blinding prevention as claimed in claim 1 and processing method, is characterized in that the prevention process step of described wet desulphurization slurries blinding prevention method also comprises
1. ignition of the boiler mode adopts plasma or little 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 the absorption tower slurries, avoids causing poisoning blinding because of dust in the slurries of absorption tower and greasy dirt concentration excess;
2. desulphurization system in the situation that the absorption tower is clear water fully when starting, should introduce absorption tower gypsum slurries crystal seed from the adjacent stove of normal operation, and the crystal seed total amount of introducing is not less than 1/3rd of absorption tower design liquid level.
6. wet desulphurization slurries blinding as claimed in claim 1 prevention and processing method is characterized in that treatment process steps that described wet desulphurization slurries blinding processing method adopts also is included in and add absorption tower slurry pH value, former flue gas SO in same history graphs
2Concentration, desulfuration efficiency, unit load, boiler total blast volume, the theoretical stock volume of lime stone, actual stock volume, and the indication range of parameter is set to scope suitable, that can obviously find out variation tendency.
7. wet desulphurization slurries blinding as claimed in claim 1 prevents and processing method, it is characterized in that treatment process steps that described wet desulphurization slurries blinding processing method adopts also comprises continuously replaces gypsum slurries in the absorption tower, employing is by squeezing into the slurries of adjacent stove absorption tower quality better this absorption tower and carry out the absorption tower moisturizing, the replacing velocity of slurries in quickening accident absorption tower, the slurries with the blinding absorption tower directly efflux the accident slurry tank or abandon simultaneously.
8. wet desulphurization slurries blinding as claimed in claim 1 prevents and processing method, it is characterized in that adopting continuously during treatment process steps that described wet desulphurization slurries blinding processing method adopts 1. theoretical stock volume 30%～40% to the absorption tower for slurry to keep desulfuration efficiency, approximately 6～8 hours duration, the increase method of the slow increase lime stone stock volume of described treatment process steps described in 2. is: according to theoretical stock volume curve, 1. kept 1～1.2 hour after 30%～40% theoretical stock volume described in is transitioned into 45%～55% theoretical stock volume by treatment process steps gradually, kept 2～2.5 hours after being transitioned into 60%～75% theoretical stock volume by 45%～55% theoretical stock volume again, 95%～100% theoretical stock volume such as be transitioned into afterwards and kept 4～6 hours, be transitioned into 102%～108% theoretical stock volume and be maintained to the absorption tower slurry pH value by 95%～100% theoretical stock volume at last and rise to more than 5.0.
9. wet desulphurization slurries blinding as claimed in claim 1 prevention and processing method is characterized in that SO in former flue gas occurring during treatment process steps that described wet desulphurization slurries blinding processing method adopts 2.
2During the mass flow fluctuation, first control the absorption tower slurry pH value stable, stock volume is controlled as target adopts manual adjustment lime stone slurry control valve to keep current absorption tower slurry pH value, treat former flue gas SO
2Recover again to promote absorption tower slurry pH value operation after total flow is stable.
10. wet desulphurization slurries blinding as claimed in claim 8 prevents and processing method, it is characterized in that adopting continuously during treatment process steps that described wet desulphurization slurries blinding processing method adopts 1. theoretical stock volume 34% to the absorption tower for slurry to keep desulfuration efficiency, approximately 6～8 hours duration; Described treatment process steps 2. according to theoretical stock volume curve, 1. 34% theoretical stock volume described in is transitioned into 50% theoretical stock volume and held time 1 hour by treatment process steps gradually, be transitioned into 67% theoretical stock volume and kept 2 hours by 50% theoretical stock volume again, the 100% theoretical stock volume such as be transitioned into afterwards and kept 5 hours, being transitioned into 105% theoretical stock volume and being maintained to the absorption tower slurry pH value by 100% theoretical stock volume at last and rise to more than 5.0.
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| 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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