CN110756035B - Desulfurization oxidation wind volume control method, control system and oxidation wind supply device - Google Patents
Desulfurization oxidation wind volume control method, control system and oxidation wind supply device Download PDFInfo
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- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 175
- 230000003647 oxidation Effects 0.000 title claims abstract description 165
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 114
- 230000023556 desulfurization Effects 0.000 title claims abstract description 112
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000013461 design Methods 0.000 claims abstract description 59
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000003546 flue gas Substances 0.000 claims abstract description 31
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 30
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims abstract description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- 239000001301 oxygen Substances 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims description 22
- 238000005516 engineering process Methods 0.000 claims description 4
- 230000003009 desulfurizing effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 4
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 3
- 235000010261 calcium sulphite Nutrition 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- B01D53/346—Controlling the process
-
- 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
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
-
- 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
Abstract
The invention discloses a desulfurization and oxidation wind air quantity control method, a control system and an oxidation wind supply device, which belong to the technical field of wet desulfurization, wherein the desulfurization and oxidation wind air quantity control method firstly calculates and designs the mass concentration of sulfite, then records the sulfur dioxide concentration at a desulfurization inlet and a desulfurization outlet at the same moment and the flow of desulfurization flue gas, calculates and obtains the actual mass concentration of sulfite, and further obtains the quality factor of sulfite. And then, according to the molar ratio of oxygen to sulfite in the chemical reaction formula, calculating an oxidation wind flow factor, and finally obtaining the actual required oxidation wind flow. The oxidation air quantity is accurately regulated in real time by regulating the inlet regulating valve of the oxidation fan, so that the purpose of energy reduction is achieved.
Description
Technical Field
The invention relates to the technical field of wet desulfurization, in particular to a desulfurization oxidation wind volume control method, a control system and an oxidation wind supply device.
Background
The plant power consumption of the thermal power plant is one of the main economic and technical indexes for measuring the generator set. Along with the continuous deepening of the reform of the power enterprises, the power enterprises gradually change from production type to operation type, the enterprise benefit is improved, and the reduction of the power generation cost is a long-term target of the operation type enterprises.
As the national requirements for environmental protection are higher and higher, most of domestic thermal power plants have built desulfurization facilities, and the requirements of ultra-low emission are gradually met. The method optimizes the operation condition of the desulfurization auxiliary equipment, reduces the electricity consumption of the desulfurization auxiliary equipment, such as the operation electricity consumption of an oxidation fan, and has important significance for reducing the plant electricity consumption of the thermal power unit, saving energy and optimizing operation. Especially for high sulfur coal units and units which can not run at full load for a long time in a low load zone, the energy-saving effect is more considerable.
At present, the limestone-gypsum desulfurization technology principle of a coal-fired unit in a thermal power plant is that SO2 in flue gas and limestone react chemically and are oxidized and crystallized to generate gypsum. In the desulfurization process, a large amount of oxidized air is required to be blown in the reaction of oxidizing calcium sulfite into calcium sulfate. The conventional desulfurization system adopts a mode of bubbling excessive air to promote the reaction of calcium sulfite and oxygen. However, such operation results in a large amount of air entering the system, the operating efficiency of the oxidation blower is reduced, electric energy is wasted, and the operating mode is not economical.
Disclosure of Invention
The invention aims to provide a desulfurization oxidation wind volume control method, a control system and an oxidation wind supply device, which are used for promoting the reaction of calcium sulfite and oxygen in a mode of blowing excessive air. However, the operation of the oxidation fan not only causes a large amount of air to enter the system, but also wastes electric energy, and the operation mode is very uneconomical.
In order to solve the technical problems, the invention provides a desulfurization oxidation wind volume control method, which comprises the following steps:
step one, installing a flue gas flowmeter at a desulfurization inlet for measuring flue gas flow of the desulfurization inlet, and installing sulfur dioxide analyzers at the desulfurization inlet and the desulfurization outlet for measuring SO of the desulfurization inlet respectively 2 Concentration and desulfurization outlet SO 2 Concentration;
step two, an oxidation fan is arranged at an oxidation wind inlet for providing oxidation wind, and an oxidation wind flow measuring device is arranged for measuring oxidation wind flow;
step three, obtaining the designed sulfite mass concentration P according to the formula (I) Design of ，
P Design of =R Design of (S Inlet design -S Outlet design ) （Ⅰ），
Wherein R is Design of Flow rate is designed for desulfurization flue gas, S Inlet design Designing SO for desulfurization inlet 2 Concentration, S Outlet design SO is designed for desulfurization outlet 2 Concentration;
recording the values of sulfur dioxide analyzers at the desulfurization inlet and the desulfurization outlet at the same moment and the value of a flue gas flowmeter at the desulfurization inlet at the moment, and obtaining the actual sulfite mass concentration P according to a formula (II) Actual j ，
P Actual j =R j (S Inlet j -S Outlet j ) （Ⅱ），
Wherein R is j S is the actual flow of desulfurization flue gas Inlet j Is the actual SO of the desulfurization inlet 2 Concentration, S Outlet j For desulfurizing outlet actual SO 2 Concentration;
step five, obtaining sulfite quality factor P according to formula (III) j ，
P j =P Actual j /P Design of （Ⅲ），
Wherein P is Actual j From step four, P Design of The third step is to obtain;
step six, determining the actual required oxidized wind flow Q at the moment according to the formula (IV) and the formula (V) Actual i ，
Q Actual i =Q i Q Design of （Ⅳ），
Wherein Q is i For the oxidation wind flow factor, Q Design of The flow of oxidized wind is designed;
Q i =P j （Ⅴ）；
step seven, according to the actual required oxygen demand flow Q determined in step six Actual i And performing closed-loop control on the air quantity of the oxidation fan, and adjusting the oxidation air flow quantity of the oxidation fan.
Preferably, in the fourth step, the dynamic stability control technology is adopted to monitor the values of the sulfur dioxide analyzers at the desulfurization inlet and the desulfurization outlet and the values of the flue gas flowmeter in real time.
In addition, the invention also provides a control system for realizing the desulfurization and oxidation wind volume control method, which comprises the following steps:
the data acquisition device is used for acquiring real-time operation data of desulfurization and sending the real-time operation data to the control device;
the control device is in signal connection with the data acquisition device and is used for receiving real-time operation data and sending an oxidation wind quantity adjusting signal to the execution device;
and the execution device is in signal connection with the control device and is used for receiving the oxidation wind quantity adjusting signal and adjusting the oxidation wind quantity.
Preferably, the real-time operation data includes data of sulfur dioxide analyzers at the desulfurization inlet and the desulfurization outlet, data of a flue gas flowmeter at the desulfurization inlet, and data of an oxidized wind flow rate measurement device at the oxidized wind inlet.
In addition, the invention also provides an oxidation wind supply device, which adopts the desulfurization oxidation wind quantity control method, and comprises the following steps:
the flue gas flowmeter is arranged at the desulfurization inlet and is communicated with the absorption tower;
the sulfur dioxide analyzer is respectively arranged at the desulfurization inlet and the desulfurization outlet and is communicated with the absorption tower;
the oxidation fan is arranged at the oxidation wind inlet and is communicated with the absorption tower;
the oxidation wind flow measuring device is arranged at the oxidation wind inlet and on a pipeline between the oxidation fan and the absorption tower.
Preferably, the oxidation wind supply device at least comprises two groups of oxidation fans and an oxidation wind flow measuring device.
Preferably, the oxidation wind inlet is further provided with an oxidation fan rear pressure measuring device and an oxidation fan rear temperature measuring device, and the oxidation fan rear pressure measuring device and the oxidation fan rear temperature measuring device are arranged on a pipeline between the oxidation fan and the absorption tower.
Preferably, the oxidation wind inlet is further provided with an oxidation fan front pressure measuring device and an oxidation fan front temperature measuring device, and the oxidation fan front pressure measuring device and the oxidation fan front temperature measuring device are arranged on a pipeline connected with a front bearing of the oxidation fan.
Preferably, an automatic oxidation wind supply switch and a manual oxidation wind supply switch are arranged on a pipeline between the oxidation fan and the absorption tower.
Preferably, the pipeline at the oxidation wind inlet is formed by connecting multiple stages of pipelines in parallel.
Compared with the prior art, the invention has the characteristics and beneficial effects that: firstly, calculating and designing the mass concentration of the sulfite, then recording the sulfur dioxide concentration at the desulfurization inlet and the desulfurization outlet at the same time and the flow of the desulfurization flue gas, calculating to obtain the actual mass concentration of the sulfite, and further obtaining the quality factor of the sulfite. And then, according to the molar ratio of oxygen to sulfite in the chemical reaction formula, calculating an oxidation wind flow factor, and finally obtaining the actual required oxidation wind flow. The oxidation air quantity is accurately regulated in real time by regulating the inlet regulating valve of the oxidation fan, so that the purpose of energy reduction is achieved.
Drawings
FIG. 1 shows a desulfurization and oxidation wind volume control system.
FIG. 2 is a schematic structural view of a desulfurization apparatus.
The drawings are marked: a 1-desulfurization inlet, a 2-desulfurization outlet, a 3-oxidation wind flow measuring device, a 4-oxidation fan, a 6-oxidation wind inlet, a 7-flue gas flowmeter, an 8-sulfur dioxide analyzer, a 9-absorption tower, a 10-oxidation fan back pressure measuring device, a 11-oxidation fan back temperature measuring device, a 12-oxidation fan front pressure measuring device, a 13-oxidation fan front temperature measuring device, a 14-oxidation wind supply automatic switch, a 15-oxidation wind supply manual switch, a 16-oxidation wind emptying door, a 17-expansion joint, a 18-safety discharge door, a 19-silencer, a 20-data acquisition device, a 21-control device and a 22-execution device.
Detailed Description
The present invention will be further described below in order to make the technical means, innovative features, achieved objects and effects achieved by the present invention easy to understand.
The examples described herein are specific embodiments of the present invention, which are intended to illustrate the inventive concept, are intended to be illustrative and exemplary, and should not be construed as limiting the invention to the embodiments and scope of the invention. In addition to the embodiments described herein, those skilled in the art can adopt other obvious solutions based on the disclosure of the claims and specification of the present application, including those adopting any obvious substitutions and modifications to the embodiments described herein.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Fig. 2 shows an oxidized wind supply device, which comprises a flue gas flowmeter 7, a sulfur dioxide analyzer 8, an oxidized wind blower 4 and an oxidized wind flow measuring device 3. The flue gas flowmeter 7 is arranged at the desulfurization inlet 1 and is communicated with the absorption tower 9 for measuring the flow rate of the desulfurization flue gas. The sulfur dioxide analyzer 8 is respectively arranged at the desulfurization inlet 1 and the desulfurization outlet 2 and is communicated with the absorption tower 9, and the sulfur dioxide analyzer 8 at the desulfurization inlet 1 is used for measuring the SO at the desulfurization inlet 2 Concentration, oxidation at desulfurization outlet 2The sulfur analyzer 8 is used for measuring the SO at the desulfurization outlet 2 Concentration.
The oxidation fan 4 is provided at the oxidation wind inlet 6 and communicates with the absorption tower 9 for supplying oxidation wind to the desulfurization device. The oxidized wind flow rate measuring device 3 is arranged at the oxidized wind inlet 6 and on a pipeline between the oxidized wind machine 4 and the absorption tower 9, and is used for measuring oxidized wind flow rate in real time. The front end of the oxidation fan 4 is provided with an oxidation fan front bearing, and the rear end of the oxidation fan 4 is provided with an oxidation fan rear bearing.
The desulfurization device preferably comprises at least two groups of oxidation fans 4 and oxidation air flow measuring devices 3, so that the system is more flexible, later overhauling and maintenance are convenient, and the reliability is greatly improved.
The oxidation wind inlet 6 is also provided with an oxidation fan rear pressure measuring device 10 and an oxidation fan rear temperature measuring device 11 which are respectively used for monitoring the pressure and the temperature of oxidation wind in a pipeline at the rear end of the oxidation fan 4. The oxidation fan rear pressure measuring device 10 and the oxidation fan rear temperature measuring device 11 are arranged on a pipeline between the rear end of the oxidation fan 4 and the absorption tower 9.
The oxidation wind inlet 6 is also provided with an oxidation wind front pressure measuring device 12 and an oxidation wind front temperature measuring device 13, and the oxidation wind front pressure measuring device 12 and the oxidation wind front temperature measuring device 13 are arranged on a pipeline connected with a front bearing of the oxidation wind 4 and are used for monitoring the pressure and the temperature of oxidation wind in a pipeline at the front end of the oxidation wind 4.
An automatic switch 14 for supplying oxidation wind and a manual switch 15 for supplying oxidation wind are arranged on the pipeline between the oxidation fan 4 and the absorption tower 9. The oxidation wind supply automatic switch 14 is used for automatic switching among a plurality of oxidation fans 4, and realizes the function of on-line mutual standby. The oxidized wind supply manual switch 15 is a check valve, and prevents the oxidized wind from flowing backward. The invention is also provided with an oxidation wind evacuation door 16 on the pipeline between the oxidation wind supply automatic switch 14 and the oxidation wind supply manual switch 15 and the oxidation wind flow measuring device 3, which is used for assisting the starting of the oxidation fan 4 and is closed after the starting. In order to reduce the axial load of the pipeline between the oxidation fan 4 and the absorption tower 9, the invention also discloses an expansion joint 17 sleeved outside the pipeline between the oxidation fan 4 and the absorption tower 9. In addition, the invention also provides a safety discharge door 18 on the pipeline between the oxidation fan 4 and the absorption tower 9 to prevent the pipeline from being over-pressurized.
In addition, the invention also installs a muffler 19 on the pipeline in front of the front bearing of the oxidation fan 4 to eliminate the noise generated by the desulfurization device in the running process.
The pipeline at the oxidation wind inlet 6 is a multi-stage pipeline which is connected in parallel to form multi-stage operation, and the oxidation wind inlet is convenient for on-site overhaul and maintenance of the oxidation fan 4.
Fig. 1 shows a desulfurization oxidation wind volume control system, which comprises a data acquisition device, a control device and an execution device. The data acquisition device is used for acquiring real-time operation data of the fire coal and sending the real-time operation data to the control device. The real-time operation data includes data of the sulfur dioxide analyzer 8 at the desulfurization inlet 1 and the desulfurization outlet 2, data of the flue gas flowmeter 7 at the desulfurization inlet 1, and data of the oxidized wind flow rate measuring device 3 at the oxidized wind inlet 6. The control device is in signal connection with the data acquisition device and is used for receiving real-time operation data and sending an oxidation wind quantity adjusting signal to the execution device. The execution device is in signal connection with the control device and is used for receiving the oxidation wind quantity adjusting signal and adjusting the oxidation wind quantity.
The method for controlling the desulfurization oxidation wind volume by utilizing the desulfurization device specifically comprises the following steps:
step one, installing a flue gas flowmeter 7 at the desulfurization inlet 1 for measuring the flow of desulfurization flue gas, and installing sulfur dioxide analyzers 8 at the desulfurization inlet 1 and the desulfurization outlet 2 for measuring the SO at the desulfurization inlet respectively 2 Concentration and desulfurization outlet SO 2 Concentration.
And step two, installing an oxidation fan 4 at the oxidation wind inlet 6 for providing oxidation wind, and installing an oxidation wind flow measuring device 3 for measuring oxidation wind flow.
Step three, obtaining the designed sulfite mass concentration P according to the formula (I) Design of ，
P Design of =R Design of (S Inlet design -S Outlet design ) （Ⅰ），
Wherein R is Design of Flow rate is designed for desulfurization flue gas, S Inlet design Designing SO for desulfurization inlet 2 Concentration, S Outlet design SO is designed for desulfurization outlet 2 Concentration. R is R Design of 、S Inlet design 、S Outlet design All are fixed values, and are provided by a design institute.
Recording the values of the sulfur dioxide analyzers 8 at the desulfurization inlet 1 and the desulfurization outlet 2 at the same moment and the values of the flue gas flowmeter 7 at the desulfurization inlet 1 at the moment by adopting a stable control technology, and obtaining the actual sulfite mass concentration P according to a formula (II) Actual j ，
P Actual j =R j (S Inlet j -S Outlet j ) （Ⅱ），
Wherein R is j S is the actual flow of desulfurization flue gas Inlet j Is the actual SO of the desulfurization inlet 2 Concentration, S Outlet j For desulfurizing outlet actual SO 2 Concentration.
Step five, obtaining sulfite quality factor P according to formula (III) j ，
P j =P Actual j /P Design of （Ⅲ），
Wherein P is Actual j From step four, P Design of Is obtained by the third step.
Step six, determining the actual required oxidized wind flow Q at the moment according to the formula (IV) and the formula (V) Actual i ，
Q Actual i =Q i Q Design of （Ⅳ），
Wherein Q is i For the oxidation wind flow factor, Q Design of The flow of oxidized wind is designed;
Q i =P j （Ⅴ）。
step seven, according to the actual required oxygen demand flow Q determined in step six Actual i And (3) performing closed-loop control on the air quantity of the oxidation fan, and adjusting the oxidation air flow quantity of the oxidation fan 4.
Specifically taking a certain engineering as an example, the design flow rate R of the desulfurization flue gas Design of =2250000Nm 3 /h (standard state, dry basis), design SO of desulfurization inlet 2 Concentration S Inlet design =13000mg/Nm 3 (standard state, dry basis), design of SO at desulfurization outlet 2 Concentration S Outlet design =35mg/Nm 3 (standard state, dry basis), design oxidized wind flow Q Design of =70000Nm 3 And/h, obtaining the designed sulfite mass concentration P according to the formula (I) Design of =R Design of (S Inlet design -S Outlet design )=29171kg/h。
The actual flow R of the desulfurization flue gas collected at a certain moment j =1950000Nm 3 /h (standard state, dry basis), actual SO at desulfurization inlet 2 Concentration S Inlet j =10400mg/Nm 3 (standard state, dry basis), actual SO at desulfurization outlet 2 Concentration S Outlet j =33mg/Nm 3 Obtaining the actual sulfite mass concentration P according to the formula (II) Actual j =R j (S Inlet j -S Outlet j ) 20215kg/h, thereby obtaining sulfite quality factor P according to formula (iii) j =P Actual j /P Design of =0.693. Meanwhile, according to the formula (IV) and the formula (V), the actual required oxygen demand flow rate is calculated to be Q at the same time Actual i =Q i Q Design of =P j Q Design of =48510Nm 3 /h。
The practical case can be obtained without dynamic control of the air volume of the oxidation air, wherein the oxidation air system works at full load according to the design output, and the air volume is Q Design of =70000Nm 3 And/h, adopting oxidation wind regulating quantity Q at the moment after oxidation wind dynamic control Actual i =48510Nm 3 And (h) compared with the prior art, the method saves about 30.7% of oxidation wind consumption, effectively improves the operation efficiency of the oxidation wind supply system, and achieves the overall aims of energy conservation and consumption reduction.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the design of the present invention.
Claims (10)
1. The desulfurization oxidation wind volume control method is characterized by comprising the following steps:
step one, installing a flue gas flowmeter (7) at the desulfurization inlet (1) for measuring the flue gas flow of the desulfurization inlet, and installing sulfur dioxide analyzers (8) at the desulfurization inlet (1) and the desulfurization outlet (2) for measuring the SO of the desulfurization inlet respectively 2 Concentration and desulfurization outlet SO 2 Concentration;
step two, an oxidation fan (4) is arranged at an oxidation wind inlet (6) for providing oxidation wind, and an oxidation wind flow measuring device (3) is arranged for measuring oxidation wind flow;
step three, obtaining the designed sulfite mass concentration P according to the formula (I) Design of ，
P Design of =R Design of (S Inlet design -S Outlet design ) （Ⅰ），
Wherein R is Design of Flow rate is designed for desulfurization flue gas, S Inlet design Designing SO for desulfurization inlet 2 Concentration, S Outlet design SO is designed for desulfurization outlet 2 Concentration;
recording the values of a sulfur dioxide analyzer (8) at the desulfurization inlet (1) and the desulfurization outlet (2) at the same time and the value of a flue gas flowmeter (7) at the desulfurization inlet (1) at the same time, and obtaining the actual sulfite mass concentration P according to a formula (II) Actual j ，
P Actual j =R j (S Inlet j -S Outlet j ) （Ⅱ），
Wherein R is j S is the actual flow of desulfurization flue gas Inlet j Is the actual SO of the desulfurization inlet 2 Concentration, S Outlet j For desulfurizing outlet actual SO 2 Concentration;
step five, obtaining sulfite quality factor P according to formula (III) j ，
P j =P Actual j /P Design of （Ⅲ），
Wherein P is Actual j From step four, P Design of The third step is to obtain;
step six, determining the actual required oxidized wind flow Q at the moment according to the formula (IV) and the formula (V) Actual i ，
Q Actual i =Q i Q Design of （Ⅳ），
Wherein Q is i For the oxidation wind flow factor, Q Design of The flow of oxidized wind is designed;
Q i =P j （Ⅴ）；
step seven, according to the actual required oxygen demand flow Q determined in step six Actual i And (3) performing closed-loop control on the air quantity of the oxidation fan, and adjusting the oxidation air flow quantity of the oxidation fan (4).
2. The desulfurization oxidized wind volume control method according to claim 1, characterized in that: and in the fourth step, a dynamic stability control technology is adopted to monitor the numerical values of the sulfur dioxide analyzers (8) at the desulfurization inlet (1) and the desulfurization outlet (2) and the numerical value of the flue gas flowmeter (7) in real time.
3. A control system for realizing the desulfurization oxidized wind volume control method according to claim 1 or 2, characterized by comprising:
the data acquisition device (20) is used for acquiring real-time operation data of desulfurization and sending the real-time operation data to the control device (21);
the control device (21) is in signal connection with the data acquisition device (20) and is used for receiving real-time operation data and sending an oxidation wind quantity adjusting signal to the execution device (22);
and the execution device (22) is in signal connection with the control device (21) and is used for receiving the oxidation wind quantity adjusting signal and adjusting the oxidation wind quantity.
4. A control system according to claim 3, characterized in that: the real-time operation data comprise data of sulfur dioxide analyzers (8) at the desulfurization inlet (1) and the desulfurization outlet (2), data of a flue gas flowmeter (7) at the desulfurization inlet (1) and data of an oxidation wind flow measuring device (3) at the oxidation wind inlet (6).
5. An oxidized wind supply device, characterized in that the desulfurization oxidized wind amount control method according to claim 1 or 2 is employed, comprising:
a flue gas flowmeter (7) arranged at the desulfurization inlet (1) and communicated with the absorption tower (9);
the sulfur dioxide analyzer (8) is respectively arranged at the desulfurization inlet (1) and the desulfurization outlet (2) and is communicated with the absorption tower (9);
an oxidation fan (4) which is arranged at the oxidation air inlet (6) and is communicated with the absorption tower (9);
and the oxidation wind flow measuring device (3) is arranged at the oxidation wind inlet (6) and is arranged on a pipeline between the oxidation fan (4) and the absorption tower (9).
6. The oxidized wind supply apparatus according to claim 5, wherein: the oxidation wind supply device at least comprises two groups of oxidation fans (4) and an oxidation wind flow measuring device (3).
7. The oxidized wind supply apparatus according to claim 5, wherein: the oxidation wind inlet (6) is also provided with an oxidation fan rear pressure measuring device (10) and an oxidation fan rear temperature measuring device (11), and the oxidation fan rear pressure measuring device (10) and the oxidation fan rear temperature measuring device (11) are arranged on a pipeline between the oxidation fan (4) and the absorption tower (9).
8. The oxidized wind supply apparatus according to claim 5, wherein: the oxidation wind inlet (6) is also provided with an oxidation fan front pressure measuring device (12) and an oxidation fan front temperature measuring device (13), and the oxidation fan front pressure measuring device (12) and the oxidation fan front temperature measuring device (13) are arranged on a pipeline connected with a front bearing of the oxidation fan (4).
9. The oxidized wind supply apparatus according to claim 5, wherein: an automatic oxidation wind supply switch (14) and a manual oxidation wind supply switch (15) are arranged on a pipeline between the oxidation fan (4) and the absorption tower (9).
10. The oxidized wind supply apparatus according to claim 5, wherein: the pipeline at the oxidation wind inlet (6) is a multi-stage pipeline which is connected in parallel to form multi-stage operation.
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