CN102819274A - Blind zone detection method in process of controlling pH value of desulfurization system - Google Patents
Blind zone detection method in process of controlling pH value of desulfurization system Download PDFInfo
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- CN102819274A CN102819274A CN2012102699914A CN201210269991A CN102819274A CN 102819274 A CN102819274 A CN 102819274A CN 2012102699914 A CN2012102699914 A CN 2012102699914A CN 201210269991 A CN201210269991 A CN 201210269991A CN 102819274 A CN102819274 A CN 102819274A
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Abstract
The embodiment of the invention discloses a blind zone detection method in the process of controlling the pH value of a desulfurization system. The method comprises the following steps of: in the process of controlling the pH value of the desulfurization system, detecting a pH value of limestone slurry in an adsorption tower at a first moment and a slurry supply flow of the slurry entering the adsorption tower and recording the pH value and the slurry supply flow as a first pH value and a first slurry supply flow; detecting a pH value of limestone slurry in the adsorption tower at a second moment and a slurry supply flow of the slurry entering the adsorption tower and recording the pH value and the slurry supply flow as a second pH value and a second slurry supply flow, wherein the second moment is different from the first moment by preset time; judging whether the difference of the first pH value and the second pH value is greater than and equal to a second threshold value and whether the difference of the first slurry supply flow and the second slurry supply flow is less than or equal to a third threshold value, and if both yes, judging a desulfurization blind zone is generated. According to the embodiment of the invention, the automatic blind area detection of the desulfurization system is implemented.
Description
Technical field
The application relates to desulfurization flue gases purification field, blind area detection method in particularly a kind of desulphurization system lime stone slurry pH value control procedure.
Background technology
SO
2Gas is a kind of pollutant, for avoiding contaminated environment, comprises SO for discharging
2The industrial process of gas (such as, the industrial generation process of coal fired thermal power plant), need carry out desulfurization operations usually.Referring to Fig. 1, the figure shows the absorption tower system of the wet doctor treatment of common limestone-gypsum.Sweetening process based on this absorption tower system is: suck without the flue gas of desulfurization air intake vent 11 by 10 bottoms, absorption tower, the flue gas of suction with supply to lime stone slurry 15 counter current contacting in the absorption tower, generate the half water plaster of paris (CaSO
31/2H
2O), the plaster of paris and the airborne oxygen generation chemical reaction of suction generate two aquatic gypsum (CaSO
42H
2O), thus reach and remove SO in the flue gas
2Purpose, get rid of through the air outlet 12 on 10 tops, absorption tower through the flue gas of desulfurization after purifying.In above-mentioned sweetening process; Under the situation that guarantees economic benefit; Be the desulfuration efficiency of guaranteeing to reach predetermined; Need the pH value of the lime stone slurry in the absorption tower be controlled in certain scope, this process is regulated the realization of confession slurry flow through pH value and lime stone slurry regulating device 13 that analyzing and processing pH value measurement mechanism 14 records.
In above-mentioned desulphurization system, can produce aluminum fluoride or nitrite, when the content of aluminum fluoride or nitrite is higher, will make initiate lime stone slurry lose reactivity, cause pH value continuous slide, at this moment desulfuration efficiency decrease, the gypsum quality variation.This phenomenon is called " desulfurization blind area ".The desulfurization blind area must in time be found, so that take measure targetedly, such as the stock volume that reduces lime stone slurry, strengthens slurries displacement etc.But, in the prior art,, also do not have a kind of detection desulphurization system of effective robotization the method for desulfurization blind area to occur except that relying on artificial experience judges.
Summary of the invention
Because the problem that prior art exists, the application embodiment provides blind area detection method in a kind of desulphurization system pH value control procedure, to realize that the robotization blind area is detected in the pH value control procedure.
Blind area detection method in the desulphurization system pH value control procedure that the application embodiment provides comprises:
In desulphurization system pH value control procedure, detect the pH value of first moment absorption tower sodalime stone slurries and the confession slurry flow on entering absorption tower, be recorded as a pH value and first and supply the slurry flow;
Detect the pH value of second moment absorption tower sodalime stone slurries and the confession slurry flow on entering absorption tower, be recorded as the 2nd pH value and second and supply the slurry flow; Said second differs first Preset Time constantly with first constantly;
The difference of judging a said pH value and the 2nd pH value whether more than or equal to the difference of second threshold value and first stock volume and second stock volume whether smaller or equal to the 3rd threshold value, if all be, then judge the desulfurization blind area to occur.
Preferably, said desulphurization system pH value control procedure comprises:
According to the SO that gets into the absorption tower
2Mass rate obtain and supply slurry flow theory value;
Confirm the pH initial value, the lime stone slurry pH value of pH initial value that obtains and current mensuration is compared obtain supplying slurry flow correction value;
Revise supplying slurry flow theory value according to said confession slurry flow correction value;
Actual confession slurry flow according to revised confession slurry flow value control lime stone slurry.
Further preferably, said definite pH initial value comprises:
According to SO
2Mass rate and the funtcional relationship between the pH initial value confirm to get into the SO on absorption tower
2The corresponding pH initial value of mass rate, said funtcional relationship is to satisfy under the predetermined desulfuration efficiency condition through to getting into the SO on absorption tower
2The actual pH of mass rate and absorption tower sodalime stone slurries between the prior match of mapping (enum) data form.
Further preferably, in desulphurization system pH value control procedure, judge when the desulfurization blind area occurring, said funtcional relationship is carried out conversion, then: said according to SO
2Mass rate and the funtcional relationship between the pH initial value confirm to get into the SO on absorption tower
2The corresponding pH initial value of mass rate be specially:
Confirm to get into the SO on absorption tower according to the funtcional relationship after the conversion
2The corresponding pH initial value of mass rate, the funtcional relationship F after the said conversion
2(X) with the preceding funtcional relationship F of conversion
1(X) relation between is:
F
2(X)=F
1(X)-the 4th threshold value
Further preferably, said the 4th threshold value is identical with second threshold value.
Preferably, said first Preset Time was more than or equal to 0.5 hour, and said second threshold value is smaller or equal to 0.3, and said the 3rd threshold value is more than or equal to 2 tphs.
Preferably, when the desulfurization blind area appears in judgement, trigger alarm and send warning.
Preferably, when the desulfurization blind area appears in judgement, the lime stone slurry in the absorption tower is replaced.
Two moment of the application embodiment in desulphurization system pH value control procedure write down respectively to the absorption tower confession slurry flow of lime stone slurry and the pH value of absorption tower sodalime stone slurries are provided; Form two groups of data; Then two groups of data of record are asked difference operation respectively; Operation result is compared with preset second threshold value and the 3rd threshold value respectively,, then judge the desulfurization blind area to have occurred if reach said threshold value.Compare with existing manual experience decision method, the application embodiment can carry out the detection of desulfurization blind area automatically through two groups of data obtaining two moment, has improved the detection efficiency of desulfurization blind area.In addition,, avoided the influence of artificial subjective factor, thereby improved the accuracy that the blind area is detected because the application embodiment carries out the blind area to detect automatically.
Description of drawings
In order to be illustrated more clearly in the application embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment that put down in writing among the application, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a limestone-gypsum wet desulfurization system synoptic diagram;
Fig. 2 is the SAMA figure of desulphurization system pH value control procedure;
Fig. 3 is the blind area detection method process flow diagram of the application first embodiment;
Fig. 4 is the blind area detection method process flow diagram of the application second embodiment;
Fig. 5 is the SAMA figure of the said embodiment of Fig. 4;
Fig. 6 confirms SO for the said embodiment of Fig. 4
2The process flow diagram of funtcional relationship between mass rate and pH initial value.
Embodiment
In order to make those skilled in the art person understand the technical scheme among the application better; To combine the accompanying drawing among the application embodiment below; Technical scheme among the application embodiment is carried out clear, intactly description; Obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all should belong to the scope of the application's protection.
For above-mentioned purpose, the feature and advantage that make the application can be more obviously understandable; Following elder generation combines accompanying drawing and embodiment that the application is done further detailed explanation to the principle of limestone-gypsum wet desulfurization system and briefly introducing of desulphurization system pH value control procedure again.
The wet doctor treatment of limestone-gypsum is to utilize lime stone slurry to SO
2Gas vulcanizes absorption, and the nucleus equipment of its chemical reaction is absorption tower (referring to shown in Figure 1), and the main chemical reactions that in this absorption tower, takes place (ionization reaction) is:
Can know that by following formula the pH value of absorption tower sodalime stone slurries depends on the SO of the total blast volume of the flue gas that gets into the absorption tower (this total blast volume is by the load decision of industrial unit), flue gas
2The factors such as concentration of concentration (this concentration is determined by industrial unit sulfur content in fuel) and lime stone slurry.Generally, the total blast volume of the flue gas on entering absorption tower and the SO of flue gas
2Concentration constantly changes, and the concentration of absorption tower sodalime stone slurries remains unchanged.Therefore, if the SO of the total blast volume of the flue gas on absorption tower or flue gas
2Concentration increases, and the pH value of lime stone slurry will increase, and desulfuration efficiency will improve thereupon, and vice versa.But, consider economical efficiency, desulfuration efficiency can not be excessive, need the pH value of lime stone slurry be controlled within the specific limits.Also can be known by following formula, under the situation that satisfies predetermined desulfuration efficiency, increase the concentration of the pH value of lime stone slurry if desired, then should carry out or not carry out the reversible reaction of second formula is reverse, promptly reducing provides lime stone slurry in the absorption tower; Reduce the concentration of the pH value of lime stone slurry if desired, then should the reversible reaction forward of second formula be carried out, promptly increase and in the absorption tower, replenish lime stone slurry, to consume the H in the sodalime stone slurries of absorption tower
+
Referring to Fig. 2, the figure shows a kind of SAMA figure that in sweetening process, carries out the control of pH value based on above-mentioned principle.SAMA figure is that U.S.'s scientific instrument are made the drawing legend that association (Scientific Apparatus Maker ' s Association) is adopted, and its easy to understand can be known the expression systemic-function, and widely automatic control system adopts.Can know that from Fig. 2 pH value control procedure comprises:
The first step: according to the SO that gets into the absorption tower
2Mass rate obtain and supply slurry flow theory value;
The SO here
2Mass rate for getting into the flue gas total blast volume (Nm on absorption tower
3/ h) with this flue gas in SO
2Concentration (mg/Nm
3) product.Obtain flue gas total blast volume and SO in mensuration
2Can obtain SO after the concentration
2Mass rate.Can know the limestone slurry flow quantity and the SO that provide to the absorption tower by aforementioned chemical equation
2Mass rate have in proportion relation, therefore, at definite SO
2Mass rate after, can make things convenient for to such an extent that to supply slurry flow theory value.Certainly, in some cases, according to actual needs, limestone slurry flow quantity and SO that the absorption tower provides
2Mass rate can not have in proportion relation, at this moment supply slurry flow theory value according to SO
2Mass rate and supply the preset rules between the slurry flow theory value to confirm that this preset rules can be presented as the Function Mapping relation, like the F among Fig. 2 (X).
Second step: confirm the pH initial value, the lime stone slurry pH value of this pH initial value and current mensuration is compared obtain supplying to starch the flow correction value;
The pH Determination of Initial Values has several different methods, such as the mode (referring to the diamond that comprises alphabetical A among Fig. 2) that can directly adopt artificial input, also can confirm SO in advance
2Mass rate and the funtcional relationship between the pH initial value, confirm to get into the SO on absorption tower according to this funtcional relationship
2The corresponding pH initial value of mass rate.After confirming the pH initial value; Can the lime stone slurry pH value of current practical measurement be compared to confirm supplying slurry flow correction value, there is multiple concrete implementation in comparison procedure, such as: can be that direct two data are added and subtracted; With result after the computing as modified value; This modified value can be born can be just, also can be according to preset weighting rule with two laggard row operations of data weighting, can also be to multiply by certain laggard row operation of the coefficient factor according to actual needs.In the practical application in industry process; In order to obtain absorption tower sodalime stone slurry pH value more exactly; Can repeatedly measure lime stone slurry; With a plurality of determination datas average obtain mean value or relatively the back select one as final measured value, the repeatedly mensuration here can be synchronization to absorption tower lime stone slurry diverse location (such as, lime stone slurry top layer and bottom) repeatedly mensuration; Also can be same position in the difference repeatedly mensuration of (such as, adjacent several seconds) constantly.In Fig. 2, show lime stone slurry is carried out mensuration twice, measure the pH value and be input to the final measured value of selective value conduct in the selector switch (rectangle frame that comprises " SEL " letter) through transmitter (comprising " AT " alphabetical cast frame).
The 3rd step: revise supplying slurry flow theory value according to said confession slurry flow correction value;
After supplying slurry flow correction value and theoretical value according to abovementioned steps, available modified value is revised theoretical value, with revised value as end value.The modification rule here can be selected according to actual conditions, such as, a kind of comparatively simple mode is directly modified value and theoretical value to be carried out plus and minus calculation, can also be modified value to be revised theoretical value as correction factor etc.
The 4th step: according to the actual confession slurry flow of revised confession slurry flow value control lime stone slurry;
Acquisition supplies can supply the slurry flow value to control the actual stock volume of lime stone slurry according to this behind the slurry flow value; In the time of in concrete this process of realization; Can directly carry out the supply of lime stone slurry according to this confession slurry flow value, this mode is applicable to usually carries out the situation that stock volume is regulated or discontinuity is carried out the stock volume adjusting for the first time; Also can measure existing confession slurry flow earlier, only regulating after comparing through actual confession slurry flow and the revised confession slurry flow value that will measure increases or reduces flow partly, and this mode is applicable to the situation of carrying out the stock volume adjusting continuously usually.In SAMA figure shown in Figure 2 the adjusting control of starching flow through the confession that the PID controller carries out.
As previously mentioned, in the pH of above-mentioned desulphurization system value control procedure, the desulfurization blind area possibly occur, so that cause a series of ill effect.After avoiding the desulfurization blind area to occur, cause adverse consequences, the application embodiment provides the blind area detection method in a kind of desulphurization system pH value control procedure.Referring to Fig. 3, the figure shows the flow process of the blind area detection method of the application first embodiment.This first embodiment comprises:
Step S301: detect the pH value of first moment absorption tower sodalime stone slurries and the confession slurry flow on entering absorption tower, be recorded as a pH value and first and supply the slurry flow;
The desulfurization blind area is detected and is started in the time of can in above-mentioned desulphurization system pH value control procedure, just having begun; Also can, desulphurization system carry out after carrying out a period of time; Can choose concrete start-up time according to actual conditions; Normal conditions preferably start the blind area in the pH value control back of carrying out a period of time and detect.After detecting and start, the blind area can select a moment constantly as first; In this moment the pH value of absorption tower sodalime stone slurries is measured; Provide the confession slurry flow of lime stone slurry to measure this moment to the absorption tower simultaneously; And note the pH value of mensuration and supply the slurry flow, supply the slurry flow as a pH value and first respectively.
Step S302: detect second constantly absorption tower sodalime stone slurries pH value and get into the confession slurry flow on absorption tower, be recorded as the 2nd pH value and flow is starched in second confession; Said second differs first Preset Time constantly with first constantly;
Accomplish and after after a while in first constantly the mensuration work; Select a moment constantly as second; In this moment the pH value of absorption tower sodalime stone slurries being carried out secondary measures; Provide the confession slurry flow of lime stone slurry to measure this moment to the absorption tower simultaneously, and note the pH value of mensuration and supply the slurry flow, supply the slurry flow as the 2nd pH value and second respectively.Second moment here can be chosen based on actual conditions, under the desulfuration efficiency condition with higher, can be provided with the time interval (i.e. first Preset Time) between second moment and first moment short, otherwise, then can be provided with longerly.But generally; Preferred first Preset Time of present embodiment was at least 0.5 hour, can reduce the mensuration number of times to pH value and confession slurry flow so on the one hand, thereby practice thrift relevant resource; On the other hand; Comparatively stable through sufficiently long time desulphurization system lime stone slurry performance, thus make the pH value that records and supply the slurry flow comparatively accurate, avoid the blind area flase drop.
Step S303: judge whether the difference of a said pH value and the 2nd pH value and the difference of first stock volume and second stock volume satisfy second threshold value and the 3rd threshold value respectively, if then judge the desulfurization blind area to occur;
After obtaining two groups of data through abovementioned steps; Can carry out calculation process to these two groups of data, judge whether their operation result satisfies second threshold value and the 3rd threshold value, the pH value difference that so-called satisfied second threshold value refers to two moment is more than or equal to second threshold value; Satisfied the 3rd threshold value refers to that the confession slurry difference in flow in two moment is smaller or equal to the 3rd threshold value; Here second threshold value and the 3rd threshold value can be chosen according to actual conditions, and preferred second threshold value of present embodiment is 0.3 unit, and the 3rd threshold value is 2 tphs.If aforementioned two judgements reach simultaneously satisfy condition, promptly the desulfurization blind area has appearred in the lime stone slurry in the current absorption tower of decidable.
Two moment of present embodiment in desulphurization system pH value control procedure write down respectively to the absorption tower confession slurry flow of lime stone slurry and the pH value of absorption tower sodalime stone slurries are provided; Form two groups of data; Then two groups of data of record are asked difference operation respectively; Operation result is compared with preset second threshold value and the 3rd threshold value respectively,, then judge the desulfurization blind area to have occurred if reach said threshold value.Compare with existing manual experience decision method, present embodiment can carry out the detection of desulfurization blind area automatically through two groups of data obtaining two moment, has improved the detection efficiency of desulfurization blind area.In addition,, avoided the influence of artificial subjective factor, thereby improved the accuracy that the blind area is detected because present embodiment is to carry out the blind area automatically to detect.
After detecting the desulfurization blind area through the foregoing description; Can take measure targetedly according to actual conditions; Such as if the desulfurization blind area is not very serious, can reduce the supply of lime stone slurry, reduce the desulphurization system operational efficiency;, then can directly all replace when comparatively serious in the desulfurization blind area the lime stone slurry in the absorption tower.Also such as; In native system, set an alarm, when detecting the desulfurization blind area, trigger alarm and send warning; Help reminding the staff in time desulfurization blind area phenomenon to be disposed like this, make whole sweetening process in the safe range of artificial " controlled, adjustable ".
Aforementioned detailed description based on the desulphurization system pH value control procedure of the wet doctor treatment of limestone-gypsum and the blind area detection method in the desulphurization system process; In actual application; Usually the two is combined, the result who promptly detects with the blind area influences or regulates the control procedure of desulphurization system pH value.The two combination constitutes the application's second embodiment.Referring to Fig. 4 and Fig. 5, wherein: Fig. 4 has gone out the blind area detection method flow process of the application second embodiment; Fig. 5 shows the SAMA figure of the application second embodiment.This embodiment comprises:
Step S401: detect the pH value of first moment absorption tower sodalime stone slurries and the confession slurry flow on entering absorption tower, be recorded as a pH value and first and supply the slurry flow;
Step S402: detect second constantly absorption tower sodalime stone slurries pH value and get into the confession slurry flow on absorption tower, be recorded as the 2nd pH value and flow is starched in second confession; Said second differs first Preset Time constantly with first constantly;
In the commercial Application process of reality, first, second pH value in the present embodiment supplies the slurry flow all can perhaps in a plurality of measured values, select one as end value according to preset rules through repeatedly measuring to average with first, second.In the SAMA of Fig. 5 figure, the pH pH-value determination pH that illustrates comprises twice mensuration (ring that comprises the AT letter), therefrom selects the measured value of a value conduct to the pH of current lime stone slurry through a selector switch (rectangle frame that comprises alphabetical SEL) then.First moment and second can produce time delay interval through chronotron constantly in the present embodiment, and the time-delay length of chronotron gets final product first Preset Time.Referring to the rectangle frame that comprises letter " LAG " among Fig. 5, promptly be a chronotron.
Step S403: judge whether the difference of a said pH value and the 2nd pH value and the difference of first stock volume and second stock volume satisfy second threshold value and the 3rd threshold value respectively, if then judge the desulfurization blind area to occur;
Step S404: to SO
2Mass rate and the funtcional relationship F between the pH initial value
1(X) carry out conversion, said funtcional relationship F
1(X) be to satisfy under the predetermined desulfuration efficiency condition through SO to the entering absorption tower
2The actual pH of mass rate and absorption tower sodalime stone slurries between the prior match of mapping (enum) data form the funtcional relationship F after the conversion
2(X) with the preceding funtcional relationship F of conversion
1(X) relation between is:
F
2(X)=F
1(X)-the 4th threshold value
The 4th threshold value here can be chosen according to actual conditions, and preferred the 4th threshold value of present embodiment is identical with second threshold value.
Step S405: according to the funtcional relationship F after the conversion
2(X) definite SO that gets into the absorption tower
2The corresponding pH initial value of mass rate, the lime stone slurry pH value of pH initial value that obtains and current mensuration compared obtains supplying to starch the flow correction value;
Referring to shown in Figure 5; Present embodiment is when detecting the desulfurization blind area; Testing result is fed back among the process of confirming the pH initial value through feedback signal (dotted line among the figure), when the blind area condition was set up, switch T1 was set to the ON state; This moment, signal flow was to being a to c, promptly according to the funtcional relationship after original funtcional relationship conversion is confirmed the pH initial value; When the blind area condition was false, switch T1 was set to the OFF state, and this moment, signal flow was to being a to b, promptly according to the definite pH initial value of original function relation.
Step S406: revise supplying slurry flow theory value according to said confession slurry flow correction value, said confession slurry flow theory value is according to the SO that gets into the absorption tower
2Mass rate obtain;
Step S407: based on the actual confession slurry flow of revised confession slurry flow value control lime stone slurry;
Present embodiment combines the blind area deterministic process with the pH value control procedure of desulphurization system; On the one hand; Through the blind area testing result is carried out the setting of FEEDBACK CONTROL pH initial value, thereby make desulphurization system pH value be controlled at when the blind area occurring and can regulate automatically, improved percent of automatization; On the other hand, being set in of pH initial value has influence on absorption tower sodalime stone slurries again in the sweetening process pH value and the confession slurry flow of lime stone slurry is provided to the absorption tower, and then the judgement of desulfurization blind area is played a role.
The foregoing description can combine application conditions further to optimize in the practical application in industry process.Such as; Referring to shown in Figure 5; A kind of optimal way is to take manually to control lime stone slurry through a switch decision and supply the slurry flow or still carry out the automatic slurry flow control according to above-mentioned process step satisfying under certain condition: when the pH value that occurs desulfurization blind area (establishment of blind area condition) and current lime stone slurry in detection less than 4.9 when (in the actual industrial process pH value be lower than this value be considered to usually the major accident risk to occur); Auto-man switch is in the ON state; This moment, signal flow was to be f to e, promptly provided lime stone slurry supply to starch flow by regulating manually to the absorption tower, such as the lime stone slurry in the absorption tower being replaced etc.; When the pH value that desulfurization blind area or current lime stone slurry do not occur more than or equal to 4.9 the time, auto-man switch is in the OFF state, this moment signal flow to be d to e, promptly regulate the lime stone that provides to the absorption tower automatically and supply to starch flow through the process step of previous embodiment.
Mention SO in the foregoing description
2There is multiple concrete definite mode in confirming of funtcional relationship between mass rate and the pH initial value in the commercial Application process.The preferred following mode of the application (referring to Fig. 6, the figure shows a kind of definite SO
2The flow process of the funtcional relationship method between mass rate and the pH initial value):
Step S601: the many groups of record get into the SO on absorption tower
2The mass rate data;
As previously mentioned, go under the stove coal content situation constant or that fixedly system sulphur boiler load is constant SO at the boiler of fixing industrial unit
2The mass rate data by SO in the total blast volume of the flue gas that gets into the absorption tower and the flue gas
2Concentration product decision, therefore, at the many groups of record SO
2The mass rate data time can obtain this two data, through calculating.In the commercial Application process, calculate and operation for simplifying, fixing with one in above-mentioned two factors usually, regulate the another one factor, thereby obtain SO
2The mass rate data.Because the total blast volume of the flue gas on entering absorption tower by the load decision of industrial unit, therefore can be fixed the load of industrial unit, changes industrial unit sulfur content in fuel, reaches SO in the change flue gas
2The purpose of concentration; Because SO in the flue gas on entering absorption tower
2Concentration determine by industrial unit sulfur content in fuel, therefore can fix industrial unit sulfur content in fuel, regulate the load of industrial unit, reach and change the total blast volume that gets into adsorption tower smoke.No matter take above-mentioned which kind of method, all can realize goal of the invention of the present invention.
Step S602: regulate the pH value of absorption tower sodalime stone slurries under every group of data, make the desulfuration efficiency of desulphurization system under every group of data all reach predetermined efficient;
Suppose (under 1≤i≤n), to get into SO in the flue gas on absorption tower at a certain operating mode i
2Concentration is c
i, the flue gas total blast volume is Q
i, at x
i=Q
i* c
iThe time, the pH value of regulating absorption tower sodalime stone slurries makes desulphurization system reach desired desulfuration efficiency η.The concrete mode of regulating the pH value here can adopt adds lime stone slurry in the absorption tower, also can directly add to comprise H
+Or OH
-Solution.
Step S603: write down the pH value that every group of data are issued to lime stone slurry behind the predetermined desulfuration efficiency;
Under presetting condition, when making desulphurization system reach desired desulfuration efficiency η, write down the pH value of sodalime stone slurries in absorption tower under every group of data correspondence through the pH value of regulating absorption tower sodalime stone slurries.In practical application in industry; Desulfuration efficiency since the influence of various factors possibly fluctuate, therefore, in order to guarantee the accuracy of record data; After the pH value of lime stone slurry that can be in the absorption tower makes desulfuration efficiency reach predetermined the requirement for the first time; Continue to keep the certain Preset Time of system stable operation, more than half an hour, and then note every group of SO
2The actual pH of the corresponding lime stone slurry of mass rate data.After noting multi-group data under every kind of operating mode, form following form:
SO
2Mass rate and lime stone slurry pH relation database table
Step S604: according to many groups SO of record
2The pH value match SO of the mass rate data and the lime stone slurry of each group data correspondence
2Funtcional relationship between mass rate and the pH initial value;
Behind the multi-group data of as above being shown through abovementioned steps, can adopt data fitting method to simulate SO
2Funtcional relationship between mass rate and the pH initial value.When carrying out data fitting, accuracy is different as requested, chooses the relational expression of match, such as adopting linear function, binomial or higher order polynomial etc.Generally, can select binomial to carry out match, as follows:
y=f(x)=Ax
2+Bx+C
In the formula: x representes SO
2The mass rate data, y representes the pH initial value, A, B, C are the data fitting data.
Above-mentioned definite SO
2In the funtcional relationship process between mass rate and the pH initial value, better accurately for the data that make match, can limit SO in advance
2The scope of mass rate is selected data recorded then in this scope.A kind ofly confirm that this interval method is to find SO in the flue gas on the absorption tower that gets into desulphurization system under the design sulfur branch condition of system
2The design load C of concentration
0And the flue gas total blast volume Q of industrial unit when maximum load (mg/Nm3),
h(Nm3/h); SO
2The least concentration value directly get among " thermal power plant's atmosphere pollutants emission standards " (GB 13223-2011) the highest permission concentration of emission limit value 400mg/Nm3 of existing Industrial Boiler, get the flue gas total blast volume of industrial unit under 50% load as interval lower limit calculated amount.Obtaining preset lower limit threshold values b and upper limit threshold values a thus is respectively:
b=C
0×Q
h×10
-6 （kg/Nm
3）
In addition, in order to make the function of data fitting reflect SO more exactly
2True relation between mass rate and the pH initial value can enlarge the sample space of data, i.e. the SO of record
2The mass rate data are many as far as possible, and generally, the group number of these data should be more than or equal to 5 groups.
The above only is the application's a embodiment; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the application's protection domain.
Claims (8)
1. the blind area detection method in the desulphurization system pH value control procedure is characterized in that said method comprises:
In desulphurization system pH value control procedure, detect the pH value of first moment absorption tower sodalime stone slurries and the confession slurry flow on entering absorption tower, be recorded as a pH value and first and supply the slurry flow;
Detect the pH value of second moment absorption tower sodalime stone slurries and the confession slurry flow on entering absorption tower, be recorded as the 2nd pH value and second and supply the slurry flow; Said second differs first Preset Time constantly with first constantly;
The difference of judging a said pH value and the 2nd pH value whether more than or equal to the difference of second threshold value and first stock volume and second stock volume whether smaller or equal to the 3rd threshold value, if all be, then judge the desulfurization blind area to occur.
2. method according to claim 1 is characterized in that, said desulphurization system pH value control procedure comprises:
According to the SO that gets into the absorption tower
2Mass rate obtain and supply slurry flow theory value;
Confirm the pH initial value, the lime stone slurry pH value of pH initial value that obtains and current mensuration is compared obtain supplying slurry flow correction value;
Revise supplying slurry flow theory value according to said confession slurry flow correction value;
Actual confession slurry flow according to revised confession slurry flow value control lime stone slurry.
3. method according to claim 2 is characterized in that, said definite pH initial value comprises:
According to SO
2Mass rate and the funtcional relationship between the pH initial value confirm to get into the SO on absorption tower
2The corresponding pH initial value of mass rate, said funtcional relationship is to satisfy under the predetermined desulfuration efficiency condition through to getting into the SO on absorption tower
2The actual pH of mass rate and absorption tower sodalime stone slurries between the prior match of mapping (enum) data form.
4. method according to claim 3 is characterized in that, in desulphurization system pH value control procedure, judges when the desulfurization blind area occurring, said funtcional relationship is carried out conversion, then: said according to SO
2Mass rate and the funtcional relationship between the pH initial value confirm to get into the SO on absorption tower
2The corresponding pH initial value of mass rate be specially:
Confirm to get into the SO on absorption tower according to the funtcional relationship after the conversion
2The corresponding pH initial value of mass rate, the funtcional relationship F after the said conversion
2(X) with the preceding funtcional relationship F of conversion
1(X) relation between is:
F
2(X)=F
1(X)-the 4th threshold value.
5. method according to claim 4 is characterized in that, said the 4th threshold value equates with second threshold value.
6. according to any one described method in the claim 1 to 5, it is characterized in that said first Preset Time was more than or equal to 0.5 hour, said second threshold value is smaller or equal to 0.3, and said the 3rd threshold value is more than or equal to 2 tphs.
7. according to any one described method in the claim 1 to 5, it is characterized in that, when the desulfurization blind area appears in judgement, trigger alarm and send warning.
8. according to any one described method in the claim 1 to 5, it is characterized in that, when the desulfurization blind area appears in judgement, the lime stone slurry in the absorption tower is replaced.
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| CN112057988B (en) * | 2020-09-03 | 2022-03-04 | 中国神华能源股份有限公司国华电力分公司 | Spraying dust removal method, equipment and system |
| CN112206640A (en) * | 2020-09-16 | 2021-01-12 | 西安热工研究院有限公司 | Limestone slurry pH value concentration fly-up detection system, method, control system and desulfurization system |
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| CN112682342A (en) * | 2020-12-11 | 2021-04-20 | 新奥数能科技有限公司 | Wet desulfurization slurry oxidation air volume control method and device |
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