CN106268273A - Limestone gypsum wet flue gas desulfurizing device is automatically for slurry control system - Google Patents
Limestone gypsum wet flue gas desulfurizing device is automatically for slurry control system Download PDFInfo
- Publication number
- CN106268273A CN106268273A CN201610673954.8A CN201610673954A CN106268273A CN 106268273 A CN106268273 A CN 106268273A CN 201610673954 A CN201610673954 A CN 201610673954A CN 106268273 A CN106268273 A CN 106268273A
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- Prior art keywords
- slurry
- supply pump
- value
- slurry supply
- frequency
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
Limestone gypsum wet flue gas desulfurizing device for slurry control system, belongs to automation field automatically.Equipment contained by this pulp feeding system includes: computer PLC 1 overlaps, powder cabin slurry supply pump 1, limestone slurry supply pump platform 1, desulfurization CEMS analyser 1 overlap, PH counts 3, densimeter 2, with computer PLC as core controller, by the instruction input of host computer, the input of various kinds of sensors, and the input of relevant mode analog quantity, complete the operation of relevant device, stopping and frequency modulation control.By flue gas desulfurization device of the present invention automatically for slurry control system, automatically after implementing for slurry, the regulation of neat stress SO2 value is stable, and is easier to control, it is not necessary to operations staff's frequent operation equipment, significantly alleviate operations staff's burden, it is ensured that desulphurization system stable operation.
Description
Technical field
The present invention relates to automatic control system field, particularly relate to limestone gypsum wet flue gas desulfurizing device and automatically supply
Slurry control system.
Background technology
Existing thermal power plant Generator Set, the limestone-gypsum installed such as 600MW Thermal generation unit is wet
Method flue gas desulfurization device, in the case of, load small fluctuation stable in ature of coal, operations staff can be the most manually to full
During foot load change, neat stress SO2 parameter regulates accordingly；When the variation of system ature of coal and desulphurization system part is important sets
Standby move back the problems such as standby and occur, cause that operations staff is big in load variations, elevation rate high in the case of cannot preferable hands
Move and neat stress SO2 parameter is adjusted, thereby result in flue gas desulfurization weak effect, more serious environmental issue occurs.
Summary of the invention
It is an object of the invention to the weak point existed for prior art, it is provided that one adjusts for slurry by automatically controlling
Neat stress SO2 parameter, reaches to alleviate operations staff's burden, the effect of guarantee desulphurization system stable operation.
The technical solution adopted for the present invention to solve the technical problems is:
Limestone gypsum wet flue gas desulfurizing device is automatically for starching control system, and equipment contained by this pulp feeding system includes: calculate
Machine PLC 1 overlaps, powder cabin slurry supply pump 1, limestone slurry supply pump platform 1, desulfurization CEMS analyser 1 overlap, PH counts 3, densimeter 2
Platform, with computer PLC as core controller, by the instruction input of host computer, the input of various kinds of sensors, and associated analog
The input of amount, completes the operation of relevant device, stopping and frequency modulation control.
This system is taked neat stress SO2 content Discrete control method.SO2 content is divided into following interval by numerical value: little
In 90；90-110；More than 110.When neat stress SO2 value is less than 90, carry out logical operations by computer PLC, with every 1.5 seconds
The speed reducing by 0.2 Hz reduces slurry supply pump frequency, reduces stock volume, makes neat stress SO2 value control in the range of 90-110；When
Neat stress SO2 value is when 90-110, and frequency conversion slurry supply pump sets according to logic and keeps current slurry supply pump frequency constant；Work as neat stress
SO2 value is more than 110, carries out logical operations by PLC, within every 1.5 seconds, to raise the speed rising slurry supply pump frequency of 0.2 Hz, increases
Stock volume, makes neat stress SO2 value control in the range of 90-110.
Pulp feeding system frequency regulation step-length and the determination of time interval:
Certain time is needed, from opening in view of the reaction with SO2 in absorption tower of the length of slurry pipeline and lime stone slurry
Begin there is time delays for slurry to neat stress SO2 value change, how to make slurry supply pump make correct frequency for this time delays
Output and response are automatically for starching one of difficult point of control system.
Invention technician is drawn by many experiments: under unit full-load conditions, slurry supply pump rate-adaptive pacemaker 50Hz
Time, neat stress SO2 corresponding time and rate of change are as follows:
| Frequency (Hz) | Response time | 2 minutes rates of change | 3 minutes rates of change | 5 minutes rates of change |
| 50 | 1 point 10 seconds | 7.3mg/Nm3 | 13.3mg/Nm3 | 37.13mg/Nm3 |
By above-mentioned data experiment and through many suboptimization, finally confirm slurry supply pump rate-adaptive pacemaker regulation step-length and time interval is divided
It it is not 0.2 and 1.5 second.
The realization of data communication between native system difference CPU:
Owing in native system, powder bin system and desulphurization system all have respective CPU, ordinary circumstance only has the data in CPU can
Mutually read, and how by desulphurization system neat stress SO2 value communication to powder bin system and will its configuration to logic be that this is automatic
Another difficult point for slurry control system.
In Logical Configuration of the present invention, we use MSG module, correctly enter Target IP and cpu address to this mould
In block, data exchange between CPU can be realized.Logical Configuration is as follows:
Minimum frequency sets: for ensureing that in absorption tower, plasm PH value is the biggest when neat stress SO2 value is less than 90 reduction stock volume
In 4, in controlling logic, introduce slurry supply pump frequency conversion minimum frequency set.According to test of many times and observation, temporarily by powder cabin for slurry
Pump minimum frequency is set as that 27 Hz, limestone slurry supply pump minimum frequency are set as that 27 Hz, i.e. slurry supply pump frequency conversion are minimum lasting defeated
Go out frequency to be respectively between 27 and 30 Hz.Under this frequency, be not only able to meet plasm PH value in absorption tower be consistently greater than 4 this
One condition, it is also possible to make the slurry pipeline will not the plugging because flow is low.
Control system pH range sets: when in desulfuration absorbing tower, pH value is more than 4 and is less than 6, can put into confession automatically
Slurry control system.
The present invention has following remarkable result: by flue gas desulfurization device of the present invention automatically for slurry control system,
Automatically after implementing for slurry, the regulation of neat stress SO2 value is stable, and is easier to control, it is not necessary to operations staff's frequent operation equipment, greatly
Alleviate greatly operations staff's burden, it is ensured that desulphurization system stable operation.
Accompanying drawing explanation
Fig. 1 is automatically for slurry control system the general frame.
Fig. 2 is automatically for slurry control system flow chart.
As shown in Figure 1: computer PLC is core controller, by host computer instruction input, various kinds of sensors defeated
Enter, and the input of relevant mode analog quantity, complete the operation of relevant device, stopping and frequency modulation control.
As shown in Figure 2: when desulphurization system input, desulfurization CEMS instrument is normal, pulp feeding system puts into, absorption tower PH is normal
Time, can start for slurry automatic system, system, by clean SO2 value feedback carries out logical operations, adjusts slurry supply pump output frequency,
Reach to control the purpose of clean SO2 value.When system puts into and manually runs, it is also possible to be manually entered slurry supply pump by host computer picture
Frequency carries out thinking control.
Detailed description of the invention
The detailed description of the invention of the present invention is elucidated referring to the attached drawing.
Contained by this pulp feeding system, equipment includes: AB Logix5000 series of PLC 1 is overlapped, frequency conversion slurry supply pump 2, desulfurization CEMS
Analyser 1 overlaps, PH counts 3, densimeter 2.
Control target: neat stress SO2 content (unit: mg/m3).
Regulation target: limestone slurry supply pump, powder cabin slurry supply pump frequency (unit: Hz).
With reference to Fig. 1: computer PLC is core controller, inputted by the instruction of host computer, the input of various kinds of sensors,
And the input of relevant mode analog quantity, complete absorption tower PH meter, absorption tower densimeter, desulfurization clean cigarette SO2 value, limestone for slurry
Pump, powder cabin slurry supply pump, frequency converter frequency and operation, stopping and the frequency modulation control of desulfurization CEMS analyser.
Shown in Fig. 2, detection desulphurization system puts into, desulfurization CEMS instrument is normal, pulp feeding system puts into, absorption tower PH is normally
No normally, can start when said system, equipment are normal for slurry automatic system；This system is taked neat stress SO2 content segmentation
Control method, is divided into following interval by SO2 content by numerical value: less than 90；90-110；More than 110.When neat stress SO2 value is less than
When 90, carry out logical operations by computer PLC, within every 1.5 seconds, to reduce the speed reduction slurry supply pump frequency of 0.2 Hz, reduce and supply
Slurry amount, makes neat stress SO2 value control in the range of 90-110；When neat stress SO2 value is at 90-110, slurry supply pump frequency conversion is according to patrolling
Collecting to set keeps current slurry supply pump frequency constant；When neat stress SO2 value is more than 110, carry out logical operations by PLC, with every 1.5
Second raises the speed of 0.2 Hz and raises slurry supply pump frequency, increases stock volume, makes neat stress SO2 value control in the range of 90-110.
System, by clean SO2 value feedback carries out logical operations, adjusts slurry supply pump output frequency, reaches to control the purpose of clean SO2 value.
Claims (5)
1. limestone gypsum wet flue gas desulfurizing device is automatically for slurry control system, it is characterised in that contained by this pulp feeding system
Equipment includes: computer PLC 1 overlaps, powder cabin slurry supply pump 1, limestone slurry supply pump platform 1, desulfurization CEMS analyser 1 overlap, PH
Count 3, densimeter 2, with computer PLC as core controller, by host computer instruction input, various kinds of sensors defeated
Enter, and the input of relevant mode analog quantity, complete the operation of relevant device, stopping and frequency modulation control.
It is the most according to claim 1 automatic for slurry control system, it is characterised in that: this system is taked to contain neat stress SO2
Amount Discrete control method, is divided into following interval by SO2 content by numerical value: less than 90,90-110, more than 110, as neat stress SO2
When value is less than 90, carry out logical operations by computer PLC, within every 1.5 seconds, to reduce the speed reduction slurry supply pump frequency of 0.2 Hz,
Reduce stock volume, make neat stress SO2 value control in the range of 90-110；When neat stress SO2 value is at 90-110, frequency conversion slurry supply pump
Setting according to logic keeps current slurry supply pump frequency constant；When neat stress SO2 value is more than 110, carry out logical operations by PLC,
Within every 1.5 seconds, to raise the speed rising slurry supply pump frequency of 0.2 Hz, increase stock volume, make neat stress SO2 value control at 90-110
In the range of.
It is the most according to claim 1 and 2 automatic for slurry control system, it is characterised in that: this pulp feeding system slurry supply pump frequency
Output regulation step-length and time interval are respectively 0.2 and 1.5 second.
It is the most according to claim 1 and 2 automatic for slurry control system, it is characterised in that: this pulp feeding system uses MSG mould
Block, correctly enters Target IP and cpu address to this module, it is achieved data exchange between CPU, and its Logical Configuration is as follows: for
Ensure that in absorption tower, plasm PH value is consistently greater than 4, draws in controlling logic when neat stress SO2 value is less than 90 reduction stock volume
Enter slurry supply pump frequency conversion minimum frequency to set, powder cabin slurry supply pump minimum frequency is set as 27 Hz, limestone slurry supply pump minimum frequency
It is set as that the minimum output frequency that continues of 27 Hz, i.e. slurry supply pump is between 27 and 30 Hz respectively；Under this frequency, it is possible to meet and inhale
Receive plasm PH value in tower and be consistently greater than 4 these conditions, it is also possible to make the slurry pipeline will not the plugging because flow is low.
It is the most according to claim 1 and 2 automatic for slurry control system, it is characterised in that: pulp feeding system pH range sets
For: when in desulfuration absorbing tower, pH value is more than 4 and is less than 6, can start automatically for slurry control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610673954.8A CN106268273A (en) | 2016-08-17 | 2016-08-17 | Limestone gypsum wet flue gas desulfurizing device is automatically for slurry control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610673954.8A CN106268273A (en) | 2016-08-17 | 2016-08-17 | Limestone gypsum wet flue gas desulfurizing device is automatically for slurry control system |
Publications (1)
| Publication Number | Publication Date |
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| CN106268273A true CN106268273A (en) | 2017-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610673954.8A Pending CN106268273A (en) | 2016-08-17 | 2016-08-17 | Limestone gypsum wet flue gas desulfurizing device is automatically for slurry control system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109012131A (en) * | 2018-08-28 | 2018-12-18 | 贵阳振兴铝镁科技产业发展有限公司 | A kind of flue gas purifying technique system desulfurization slurry material balance control method |
| CN109636001A (en) * | 2018-11-13 | 2019-04-16 | 北京国电龙源环保工程有限公司 | Desulfurization pulp feeding system pH value adjusting method, system and computer-readable medium based on big data |
| CN111068503A (en) * | 2019-12-17 | 2020-04-28 | 浙江天地环保科技有限公司 | Limestone slurry supply accurate adjustment controller and control method for desulfurization system after ultralow emission of flue gas |
| CN112619389A (en) * | 2020-11-19 | 2021-04-09 | 内蒙古蒙达发电有限责任公司 | Method and system for optimizing control of slurry supply of limestone-wet desulphurization system |
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Patent Citations (6)
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| CN101332400A (en) * | 2008-07-18 | 2008-12-31 | 朱学智 | Method for spraying calcium and devulcanizing in circulating fluid-bed boiler using PLC control system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109012131A (en) * | 2018-08-28 | 2018-12-18 | 贵阳振兴铝镁科技产业发展有限公司 | A kind of flue gas purifying technique system desulfurization slurry material balance control method |
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| CN109636001A (en) * | 2018-11-13 | 2019-04-16 | 北京国电龙源环保工程有限公司 | Desulfurization pulp feeding system pH value adjusting method, system and computer-readable medium based on big data |
| CN109636001B (en) * | 2018-11-13 | 2023-05-23 | 国能龙源环保有限公司 | Method, system and computer readable medium for adjusting pH value of desulfurization slurry supply system based on big data |
| CN111068503A (en) * | 2019-12-17 | 2020-04-28 | 浙江天地环保科技有限公司 | Limestone slurry supply accurate adjustment controller and control method for desulfurization system after ultralow emission of flue gas |
| CN112619389A (en) * | 2020-11-19 | 2021-04-09 | 内蒙古蒙达发电有限责任公司 | Method and system for optimizing control of slurry supply of limestone-wet desulphurization system |
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Application publication date: 20170104 |