CN211098396U - Desulfurization oxidation air supply device and oxidation air volume dynamic control system - Google Patents
Desulfurization oxidation air supply device and oxidation air volume dynamic control system Download PDFInfo
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- CN211098396U CN211098396U CN201921952790.8U CN201921952790U CN211098396U CN 211098396 U CN211098396 U CN 211098396U CN 201921952790 U CN201921952790 U CN 201921952790U CN 211098396 U CN211098396 U CN 211098396U
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Abstract
The utility model discloses a desulfurization oxidation wind feeding device and oxidation wind amount of wind dynamic control system belong to wet flue gas desulfurization technical field, and desulfurization oxidation wind feeding device includes smoke flowmeter, sulfur dioxide analysis appearance, oxidation fan and oxidation wind flow measurement device, and smoke flowmeter sets up in the desulfurization entrance and communicates 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 air inlet and communicated with the absorption tower. The oxidizing air flow measuring device is arranged at an oxidizing air inlet and is arranged on a pipeline between the oxidizing air blower and the absorption tower. The method and the device can monitor the required amount of the oxidation air in real time, control the opening of the inlet regulating valve of the oxidation fan, and accurately regulate the oxidation air quantity in real time, so that the real-time oxidation air quantity is the optimal oxidation air quantity, the purposes of energy saving and consumption reduction are achieved, the plant power consumption rate of a desulfurization system is reduced, and the method and the device have great popularization significance.
Description
Technical Field
The utility model relates to a wet flue gas desulfurization technical field specifically is a desulfurization oxidation wind feeding device and oxidation wind amount of wind dynamic control system.
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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a desulfurization oxidation wind feeding device and oxidation wind amount of wind dynamic control system to solve the mode of blowing excessive air, promote calcium sulfite and oxygen to take place to react. 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 utility model provides a desulfurization oxidation wind feeding device, include:
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.
Preferably, an expansion joint is sleeved outside a pipeline between the oxidation fan and the absorption tower.
Preferably, a safe discharge door is arranged on a pipeline between the oxidation fan and the absorption tower.
Additionally, the utility model also provides an oxidation wind amount of wind dynamic control system, including above-mentioned desulfurization oxidation wind feeding device, still include:
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.
Compared with the prior art, the utility model discloses a characteristics and beneficial effect do: the utility model provides a desulfurization oxidation wind feeding device and oxidation wind amount of wind dynamic control system can realize real-time supervision oxidation wind required amount to control oxidation fan entry regulating valve aperture, the real-time accurate oxidation amount of wind of adjusting, thereby guarantee that the real-time oxidation amount of wind is the optimum oxidation amount of wind, reach energy saving and consumption reduction's purpose, reduced desulfurization system's station service power consumption rate, had very big popularization meaning.
Drawings
FIG. 1 is a schematic view showing the construction of a desulfurization oxidizing air supply apparatus.
Fig. 2 is a schematic diagram of an oxidation air volume dynamic control system.
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 will be further described below.
The embodiments described herein are specific embodiments of the present invention, and are intended to be illustrative of the concepts of the present invention, which are intended to be illustrative and exemplary, and should not be construed as limiting the scope of the embodiments of the present 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 end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made 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, and for example, "connected" may be either fixedly connected or 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 shows a desulfurization oxidation air supply device, which comprises a flue gas flowmeter 7, a sulfur dioxide analyzer 8, an oxidation fan 4 and an oxidation 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 utility model discloses still be equipped with oxidation wind evacuation door 16 on the pipeline between oxidation wind supply automatic switch 14 and oxidation wind supply manual switch 15 and oxidation wind flow measurement device 3 at oxidation wind for oxidation fan 4 assists the start-up, and close after the start-up. In order to reduce the axial load of the pipeline between the oxidation fan 4 and the absorption tower 9, the utility model discloses the pipeline that still between the oxidation fan 4 and the absorption tower 9 is outer to have cup jointed expansion joint 17. In addition, the utility model discloses still be equipped with safe discharge gate 18 on the pipeline between oxidation fan 4 and absorption tower 9, prevent the pipeline superpressure.
In addition, the utility model 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.
As shown in fig. 2, the system for dynamically controlling the air volume of the oxidation air comprises the desulfurization oxidation air supply device, and further 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。
The practical cases can be derivedThe 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 embodiments are merely 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 without departing from the spirit of the present invention should fall within the protection scope defined by the claims.
Claims (10)
1. A desulfurization oxidizing air supply device is characterized by 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).
2. The desulfurization oxidizing air supply device according to claim 1, characterized in that: the oxidizing air supply device at least comprises two groups of oxidizing air blowers (4) and an oxidizing air flow measuring device (3).
3. The desulfurization oxidizing air supply device according to claim 1, characterized in that: 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).
4. The desulfurization oxidizing air supply device according to claim 1, characterized in that: 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).
5. The desulfurization oxidizing air supply device according to claim 1, characterized in that: 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).
6. The desulfurization oxidizing air supply device according to claim 1, characterized in that: and pipelines at the oxidizing air inlet (6) are multi-stage pipelines which are connected in parallel to form multi-stage operation.
7. The desulfurization oxidizing air supply device according to claim 1, characterized in that: an expansion joint (17) is sleeved outside a pipeline between the oxidation fan (4) and the absorption tower (9).
8. The desulfurization oxidizing air supply device according to claim 1, characterized in that: and a safe discharge door (18) is arranged on a pipeline between the oxidation fan (4) and the absorption tower (9).
9. An oxidizing air flow rate dynamic control system, characterized by comprising the desulfurization oxidizing air supply device according to any one of claims 1 to 8, and further 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.
10. The dynamic control system for the air volume of the oxidizing air according to claim 9, characterized in that: the real-time operation data comprises 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 oxidizing air flow measuring device (3) at the oxidizing air inlet (6).
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| CN113750772A (en) * | 2021-08-12 | 2021-12-07 | 华能国际电力股份有限公司营口电厂 | Energy-saving system applied to oxidation fan and operation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113750772A (en) * | 2021-08-12 | 2021-12-07 | 华能国际电力股份有限公司营口电厂 | Energy-saving system applied to oxidation fan and operation method thereof |
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Address after: 100039 room 901, 9 / F, building 1, yard 16, West Fourth Ring Middle Road, Haidian District, Beijing Patentee after: Guoneng Longyuan environmental protection Co.,Ltd. Address before: 100039 room 911, 1 building, 16 West Fourth Ring Road, Haidian District, Beijing. Patentee before: BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENGINEERING Co.,Ltd. |