CN110756035A - Method and system for controlling flow rate of desulfurization oxidation air and oxidation air supply device - Google Patents
Method and system for controlling flow rate of desulfurization oxidation air and oxidation air supply device Download PDFInfo
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- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 109
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 102
- 230000023556 desulfurization Effects 0.000 title claims abstract description 101
- 230000003647 oxidation Effects 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 20
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 46
- 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 29
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000001590 oxidative effect Effects 0.000 claims description 94
- 238000013461 design Methods 0.000 claims description 54
- 238000010521 absorption reaction Methods 0.000 claims description 22
- 230000003009 desulfurizing effect Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 239000001301 oxygen Substances 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
- 238000007664 blowing Methods 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
- 230000007613 environmental effect Effects 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 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
- 230000009467 reduction Effects 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
- 230000008859 change Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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- 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
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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
- B01D53/346—Controlling the process
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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
- B01D53/46—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
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- 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
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- 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
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Abstract
The invention discloses a desulfurization oxidation air volume control method, a desulfurization oxidation air volume control system and an oxidation air supply device, and belongs to the technical field of wet desulfurization, wherein the desulfurization oxidation air volume control method comprises the steps of firstly calculating and designing the mass concentration of sulfite, then recording the sulfur dioxide concentration at a desulfurization inlet and a desulfurization outlet and the flow of desulfurization flue gas at the same moment, calculating to obtain the actual mass concentration of the sulfite, and further obtaining the quality factor of the sulfite. And then calculating an oxidation air flow factor according to the molar ratio of oxygen to sulfite in the chemical reaction formula, and finally obtaining the actual required oxidation air flow. The oxidation air quantity is accurately adjusted in real time by adjusting an inlet adjusting valve of the oxidation fan, so that the purpose of reducing energy is achieved.
Description
Technical Field
The invention relates to the technical field of wet desulphurization, in particular to a desulphurization oxidation air volume control method, a desulphurization oxidation air volume control system and an oxidation air supply device.
Background
The plant power rate of the thermal power plant is one of the main economic and technical indexes for measuring the generating set. With the continuous deepening of the reform of the power enterprises, the power enterprises gradually change from production to operation, 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 domestic thermal power plants have already built desulfurization facilities and gradually reach the requirement of ultralow emission. The operation condition of the desulfurization auxiliary equipment is optimized, the power consumption of the desulfurization auxiliary equipment is reduced, for example, the operation power consumption of an oxidation fan is reduced, and the method has important significance for reducing the plant power consumption rate of a thermal power unit, saving energy and optimizing operation. Particularly, the energy-saving effect is more considerable for high-sulfur coal units and units which can not run at full load for a long time in a low-load interval and run for a long time.
At present, the technical principle of limestone-gypsum method desulfurization of coal-fired units of thermal power plants is that SO2 in flue gas and limestone are subjected to chemical reaction, and gypsum is generated through oxidation and crystallization. In the desulfurization process, a large amount of oxidizing air needs to be blown in the reaction of oxidizing the calcium sulfite into the calcium sulfate. The conventional desulfurization system adopts a mode of blowing excessive air to promote the reaction of calcium sulfite and oxygen. However, this operation results in a large amount of air entering the system, the operating efficiency of the oxidation fan is reduced, the electric energy is wasted, and the operation mode is not economical.
Disclosure of Invention
The invention aims to provide a desulfurization oxidation air volume control method, a desulfurization oxidation air volume control system and an oxidation air supply device, which are used for promoting the reaction of calcium sulfite and oxygen in a mode of solving the problem of excess air blowing. However, the operation causes a large amount of air to enter the system, the operation efficiency of the oxidation fan is reduced, electric energy is wasted, and the operation mode is not economical.
In order to solve the technical problem, the invention provides a desulfurization oxidation air volume control method, which comprises the following steps:
step one, at a desulfurization inletA flue gas flowmeter is arranged at the position of the desulfurization inlet and used for measuring the flue gas flow at the desulfurization inlet, and sulfur dioxide analyzers are arranged at the desulfurization inlet and the desulfurization outlet and respectively used for measuring the SO at the desulfurization inlet2Concentration and desulfurization outlet SO2Concentration;
secondly, installing an oxidation fan at an oxidation air inlet for providing oxidation air, and installing an oxidation air flow measuring device for measuring the flow of the oxidation air at the same time;
step three, obtaining the designed sulfite mass concentration P according to the formula (I)Design of，
PDesign of＝RDesign of(SInlet design-SOutlet design)(Ⅰ)，
Wherein R isDesign ofDesign flow for desulfurized flue gas, SInlet designDesigning SO for desulfurization inlet2Concentration, SOutlet designDesigning SO for desulfurization outlet2Concentration;
recording the numerical values of the sulfur dioxide analyzers at the desulfurization inlet and the desulfurization outlet at the same moment and the numerical value of the flue gas flowmeter at the desulfurization inlet at the moment, and obtaining the actual sulfite mass concentration P according to the formula (II)Actual j，
PActual j＝Rj(SEntrance j-SOutlet j)(Ⅱ)，
Wherein R isjIs the actual flow of the desulfurized flue gas, SEntrance jFor de-sulfurizing the actual SO at the inlet2Concentration, SOutlet jFor desulfurizing the actual SO at the outlet2Concentration;
step five, obtaining a sulfite quality factor P according to the formula (III)j，
Pj＝PActual j/PDesign of(Ⅲ)，
Wherein P isActual jObtained by step four, PDesign ofThe third step is to obtain;
step six, determining the actually required aerobic wind flow Q at the moment according to the formula (IV) and the formula (V)Reality i，
QReality i＝QiQDesign of(Ⅳ)，
Wherein QiTo oxidize the wind flow factor, QDesign ofDesigning the flow of oxidizing air;
Qi＝Pj(Ⅴ)；
step seven, determining the actual required aerobic wind flow Q according to the step sixReality iAnd carrying out closed-loop control on the air quantity of the oxidation fan and adjusting the oxidation air flow of the oxidation fan.
Preferably, in the fourth step, a dynamic stability control technology is adopted to monitor the numerical values of the sulfur dioxide analyzers at the desulfurization inlet and the desulfurization outlet and the numerical value of the flue gas flowmeter in real time.
In addition, the invention also provides a control system for realizing the method for controlling the air volume of the desulfurization oxidation air, 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 air volume 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 air volume adjusting signal and adjusting the oxidation air volume.
Preferably, the real-time environmental data includes data of sulfur dioxide analyzers at the desulfurization inlet and the desulfurization outlet, data of a flue gas flow meter at the desulfurization inlet, and data of an oxidizing air flow measuring device at the oxidizing air inlet.
In addition, the present invention provides an oxidizing air supply device using the desulfurization oxidizing air flow rate control method, the oxidizing air supply device including:
the flue gas flowmeter is arranged at the desulfurization inlet and is communicated with the absorption tower;
the sulfur dioxide analyzers are respectively arranged at the desulfurization inlet and the desulfurization outlet and are communicated with the absorption tower;
the oxidation fan is arranged at an oxidation air inlet and is communicated with the absorption tower;
and the oxidizing air flow measuring device is arranged at an oxidizing air inlet and is arranged on a pipeline between the oxidizing air fan and the absorption tower.
Preferably, the oxidizing air supply device at least comprises two groups of oxidizing air blowers and oxidizing air flow measuring devices.
Preferably, the oxidizing air inlet is further provided with an oxidizing fan rear pressure measuring device and an oxidizing fan rear temperature measuring device, and the oxidizing fan rear pressure measuring device and the oxidizing fan rear temperature measuring device are arranged on a pipeline between the oxidizing fan and the absorption tower.
Preferably, the oxidizing air inlet is further provided with an oxidizing air blower front pressure measuring device and an oxidizing air blower front temperature measuring device, and the oxidizing air blower front pressure measuring device and the oxidizing air blower front temperature measuring device are arranged on a pipeline connected with a front bearing of the oxidizing air blower.
Preferably, an oxidizing air supply automatic switch and an oxidizing air supply manual switch are arranged on a pipeline between the oxidizing air blower and the absorption tower.
Preferably, the pipeline at the oxidizing air inlet is a multi-stage pipeline which is connected in parallel to form multi-stage operation.
Compared with the prior art, the invention has the characteristics and beneficial effects that: the method comprises the steps of firstly calculating and designing the mass concentration of the sulfite, then recording the concentration of sulfur dioxide at a desulfurization inlet and a desulfurization outlet and the flow of desulfurization flue gas at the same time, and calculating to obtain the actual mass concentration of the sulfite so as to further obtain the quality factor of the sulfite. And then calculating an oxidation air flow factor according to the molar ratio of oxygen to sulfite in the chemical reaction formula, and finally obtaining the actual required oxidation air flow. The oxidation air quantity is accurately adjusted in real time by adjusting an inlet adjusting valve of the oxidation fan, so that the purpose of reducing energy is achieved.
Drawings
FIG. 1 is a desulfurization oxidation air volume control system.
FIG. 2 is a schematic view of a desulfurization unit.
The attached drawings are marked as follows: 1-a desulfurization inlet, 2-a desulfurization outlet, a 3-oxidation air flow measuring device, a 4-oxidation air blower, a 6-oxidation air inlet, a 7-flue gas flowmeter, an 8-sulfur dioxide analyzer, a 9-absorption tower, a 10-oxidation air rear pressure measuring device, an 11-oxidation air rear temperature measuring device, a 12-oxidation air front pressure measuring device, a 13-oxidation air front temperature measuring device, a 14-oxidation air supply automatic switch, a 15-oxidation air supply manual switch, a 16-oxidation air exhaust door, a 17-expansion joint, an 18-safety exhaust door, a 19-silencer, a 20-data acquisition device, a 21-control device and a 22-execution device.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention is further described below.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" 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 is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 2, the oxidizing air supply device includes a flue gas flowmeter 7, a sulfur dioxide analyzer 8, an oxidizing air blower 4, and an oxidizing air flow measuring device 3. The flue gas flowmeter 7 is arranged at the desulfurization inlet 1 and communicated with the absorption tower 9 and used for measuring the flow 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 desulfurization inlet SO2The sulfur dioxide analyzer 8 at the concentration and desulfurization outlet 2 is used for measuring the SO at the desulfurization outlet2And (4) concentration.
The oxidation fan 4 is arranged at the oxidation air inlet 6 and communicated with the absorption tower 9 and used for supplying oxidation air to the desulfurization device. The oxidizing air flow measuring device 3 is arranged at the oxidizing air inlet 6 and on a pipeline between the oxidizing air fan 4 and the absorption tower 9 and is used for measuring the oxidizing air flow 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 desulphurization unit preferably comprises at least two groups of oxidation fans 4 and an oxidation air flow measuring device 3, so that the system is more flexible, the later-stage overhaul and maintenance are facilitated, and the reliability is greatly increased.
And the oxidizing air inlet 6 is also provided with an oxidizing air blower rear pressure measuring device 10 and an oxidizing air blower rear temperature measuring device 11 which are respectively used for monitoring the pressure and the temperature of the oxidizing air in the pipeline at the rear end of the oxidizing air blower 4. The post-oxidation-fan pressure measuring device 10 and the post-oxidation-fan temperature measuring device 11 are disposed on a pipeline between the rear end of the oxidation fan 4 and the absorption tower 9.
And the oxidizing air inlet 6 is also provided with an oxidizing air blower front pressure measuring device 12 and an oxidizing air blower front temperature measuring device 13, and the oxidizing air blower front pressure measuring device 12 and the oxidizing air blower front temperature measuring device 13 are arranged on a pipeline connected with a front bearing of the oxidizing air blower 4 and used for monitoring the pressure and the temperature of oxidizing air in the pipeline at the front end of the oxidizing air blower 4.
An oxidizing air supply automatic switch 14 and an oxidizing air supply manual switch 15 are arranged on a pipeline between the oxidizing air blower 4 and the absorption tower 9. The oxidation air supply automatic switch 14 is used for automatic switching among a plurality of oxidation fans 4, and realizes the function of mutual standby on line. The manual switch 15 for supplying the oxidizing wind is a check valve to prevent the oxidizing wind from flowing backward. The invention is also provided with an oxidizing air emptying door 16 on a pipeline between the oxidizing air supply automatic switch 14 and the oxidizing air supply manual switch 15 and the oxidizing air flow measuring device 3, and the oxidizing air emptying door is used for assisting the start of the oxidizing air fan 4 and is closed after the start. In order to reduce the axial load of the pipeline between the oxidation fan 4 and the absorption tower 9, an expansion joint 17 is sleeved outside the pipeline between the oxidation fan 4 and the absorption tower 9. In addition, the invention is also provided with a safety discharge door 18 on the pipeline between the oxidation fan 4 and the absorption tower 9 to prevent the pipeline from overpressure.
In addition, the invention also installs a silencer 19 on the pipeline in front of the front bearing of the oxidation fan 4 to eliminate the noise generated by the desulphurization device in the operation process.
The pipeline at the oxidation air inlet 6 is a multi-stage pipeline which is connected in parallel to form multi-stage operation, one operation is carried out, and the other operation is carried out, so that the oxidation air blower 4 is convenient to overhaul and maintain on site.
Fig. 1 shows a desulfurization oxidation air 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 operating data includes data of the sulfur dioxide analyzers 8 at the desulfurization inlet 1 and at the desulfurization outlet 2, data of the flue gas flow meter 7 at the desulfurization inlet 1, and data of the oxidizing air flow measuring device 3 at the oxidizing air inlet 6. The control device is in signal connection with the data acquisition device and is used for receiving the real-time operation data and sending an oxidation air volume adjusting signal to the execution device. The execution device is in signal connection with the control device and is used for receiving the oxidation air volume adjusting signal and adjusting the oxidation air volume.
The method for realizing the desulfurization oxidation air volume control by utilizing the desulfurization device comprises the following steps:
step one, installing a flue gas flowmeter 7 at a desulfurization inlet 1 for measuring the flow of the 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 respectively2Concentration and desulfurization outlet SO2And (4) concentration.
And step two, installing an oxidation fan 4 at an oxidation air inlet 6 for providing oxidation air, and installing an oxidation air flow measuring device 3 for measuring the oxidation air flow.
Step three, obtaining the designed sulfite mass concentration P according to the formula (I)Design of，
PDesign of＝RDesign of(SInlet design-SOutlet design) (Ⅰ)，
Wherein R isDesign ofDesign flow for desulfurized flue gas, SInlet designDesigning SO for desulfurization inlet2Concentration, SOutlet designDesigning SO for desulfurization outlet2And (4) concentration. RDesign of、SInlet design、SOutlet designAll are constant values and are provided by the design institute.
Step four, recording the numerical values of the sulfur dioxide analyzers 8 at the desulfurization inlet 1 and the desulfurization outlet 2 at the same moment and the numerical value of the flue gas flowmeter 7 at the desulfurization inlet 1 at the moment by adopting a stability control technology, and obtaining the actual sulfite mass concentration P according to the formula (II)Actual j，
PActual j＝Rj(SEntrance j-SOutlet j) (Ⅱ)，
Wherein R isjIs the actual flow of the desulfurized flue gas, SEntrance jFor de-sulfurizing the actual SO at the inlet2Concentration, SOutlet jFor desulfurizing the actual SO at the outlet2And (4) concentration.
Step five, obtaining a sulfite quality factor P according to the formula (III)j，
Pj＝PActual j/PDesign of(Ⅲ)，
Wherein P isActual jObtained by step four, PDesign ofObtained by the third step.
Step six, determining the actually required aerobic wind flow Q at the moment according to the formula (IV) and the formula (V)Reality i，
QReality i＝QiQDesign of(Ⅳ)，
Wherein QiTo oxidize the wind flow factor, QDesign ofDesigning the flow of oxidizing air;
Qi＝Pj(Ⅴ)。
step seven, determining the actual required aerobic wind flow Q according to the step sixReality iAnd the air volume of the oxidation fan is subjected to closed-loop control, and the oxidation air flow of the oxidation fan 4 is adjusted.
Taking a project as an example, the design flow R of the desulfurized flue gasDesign of＝2250000Nm3The desulfurization inlet is designed with SO2Concentration SInlet design＝13000mg/Nm3(Standard, dry basis), designing SO at the desulfurization outlet2Concentration SOutlet design＝35mg/Nm3(standard, dry basis), design of oxidation air flow QDesign of＝70000Nm3H, obtaining the designed sulfite mass concentration P according to the formula (I)Design of＝RDesign of(SInlet design-SOutlet design)＝29171kg/h。
Actual flow R of desulfurization flue gas collected at a certain momentj＝1950000Nm3H (standard, dry basis), actual SO at the inlet of the desulfurization2Concentration SEntrance j＝10400mg/Nm3(standard, dry basis), actual SO at the desulfurization outlet2Concentration SOutlet j＝33mg/Nm3Obtaining the actual mass concentration P of sulfite according to the formula (II)Actual j＝Rj(SEntrance j-SOutlet j) 20215kg/h, to obtain the sulfite quality factor P according to formula (iii)j＝PActual j/PDesign of0.693. Simultaneously, the actually required oxidation air flow rate Q at the same moment is calculated according to the formula (IV) and the formula (V)Reality i＝QiQDesign of＝PjQDesign of＝48510Nm3/h。
From the above practical casesFor example, it can be found that the dynamic control of the air quantity of the oxidation air is not adopted, the oxidation air system works according to the full load of the design output, and the air quantity is QDesign of＝70000Nm3H, the adjustment quantity Q of the oxidizing air at the moment after the dynamic control of the oxidizing air is adoptedReality i＝48510Nm3Compared with the prior art, the method saves about 30.7 percent of oxidation air consumption, effectively improves the operation efficiency of an oxidation air supply system, and achieves the overall aims of energy conservation and consumption reduction.
The above examples are only for describing 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 to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. A desulfurization oxidation air volume control method is characterized by comprising the following steps:
step one, installing a flue gas flowmeter (7) at a desulfurization inlet (1) for measuring the flue gas flow at the desulfurization inlet, and installing sulfur dioxide analyzers (8) at the desulfurization inlet (1) and the desulfurization outlet (2) for measuring the SO at the desulfurization inlet respectively2Concentration and desulfurization outlet SO2Concentration;
secondly, installing an oxidation fan (4) at an oxidation air inlet (6) for providing oxidation air, and installing an oxidation air flow measuring device (3) for measuring the flow of the oxidation air;
step three, obtaining the designed sulfite mass concentration P according to the formula (I)Design of，
PDesign of＝RDesign of(SInlet design-SOutlet design) (Ⅰ)，
Wherein R isDesign ofDesign flow for desulfurized flue gas, SInlet designDesigning SO for desulfurization inlet2Concentration, SOutlet designDesigning SO for desulfurization outlet2Concentration;
recording the numerical values of the sulfur dioxide analyzers (8) at the desulfurization inlet (1) and the desulfurization outlet (2) at the same moment, and desulfurizing at the momentThe numerical value of a flue gas flowmeter (7) at the inlet (1) is used for obtaining the actual sulfite mass concentration P according to the formula (II)Actual j，
PActual j＝Rj(SEntrance j-SOutlet j) (Ⅱ)，
Wherein R isjIs the actual flow of the desulfurized flue gas, SEntrance jFor de-sulfurizing the actual SO at the inlet2Concentration, SOutlet jFor desulfurizing the actual SO at the outlet2Concentration;
step five, obtaining a sulfite quality factor P according to the formula (III)j，
Pj＝PActual j/PDesign of(Ⅲ)，
Wherein P isActual jObtained by step four, PDesign ofThe third step is to obtain;
step six, determining the actually required aerobic wind flow Q at the moment according to the formula (IV) and the formula (V)Reality i，
QReality i＝QiQDesign of(Ⅳ)，
Wherein QiTo oxidize the wind flow factor, QDesign ofDesigning the flow of oxidizing air;
Qi＝Pj(Ⅴ)；
step seven, determining the actual required aerobic wind flow Q according to the step sixReality iAnd the air volume of the oxidation fan is subjected to closed-loop control, and the oxidation air flow of the oxidation fan (4) is adjusted.
2. The desulfurization oxidizing air volume control method according to claim 1, characterized in that: and in the fourth step, 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) are monitored in real time by adopting a dynamic stability control technology.
3. A control system for implementing the desulfurization oxidizing air 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 air volume 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 air volume adjusting signal and adjusting the oxidation air volume.
4. The control system of claim 3, wherein: the real-time environment data comprises data of sulfur dioxide analyzers (8) at a desulfurization inlet (1) and a desulfurization outlet (2), data of a flue gas flowmeter (7) at the desulfurization inlet (1), and data of an oxidizing air flow measuring device (3) at an oxidizing air inlet (6).
5. An oxidizing air supply device, which is characterized by adopting the desulfurization oxidizing air volume control method according to claim 1 or 2, comprising:
the flue gas flowmeter (7) is arranged at the desulfurization inlet (1) and is 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);
the oxidation fan (4) is arranged at the oxidation air inlet (6) and is communicated with the absorption tower (9);
and the oxidizing air flow measuring device (3) is arranged at the oxidizing air inlet (6) and is arranged on a pipeline between the oxidizing air fan (4) and the absorption tower (9).
6. The oxidizing air supply device according to claim 5, wherein: the oxidizing air supply device at least comprises two groups of oxidizing air blowers (4) and an oxidizing air flow measuring device (3).
7. The oxidizing air supply device according to claim 5, wherein: and the oxidizing air inlet (6) is also provided with an oxidizing fan rear pressure measuring device (10) and an oxidizing fan rear temperature measuring device (11), and the oxidizing fan rear pressure measuring device (10) and the oxidizing fan rear temperature measuring device (11) are arranged on a pipeline between the oxidizing fan (4) and the absorption tower (9).
8. The oxidizing air supply device according to claim 5, wherein: and the oxidation air inlet (6) is also provided with an oxidation air blower front pressure measuring device (12) and an oxidation air blower front temperature measuring device (13), and the oxidation air blower front pressure measuring device (12) and the oxidation air blower front temperature measuring device (13) are arranged on a pipeline connected with a front bearing of the oxidation air blower (4).
9. The oxidizing air supply device according to claim 5, wherein: an oxidizing air supply automatic switch (14) and an oxidizing air supply manual switch (15) are arranged on a pipeline between the oxidizing air blower (4) and the absorption tower (9).
10. The oxidizing air supply device according to claim 5, wherein: and pipelines at the oxidizing air inlet (6) are multi-stage pipelines which are connected in parallel to form multi-stage operation.
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