CN112892194A - Method for regulating and controlling liquid ammonia adding amount of boiler flue gas desulfurization device - Google Patents
Method for regulating and controlling liquid ammonia adding amount of boiler flue gas desulfurization device Download PDFInfo
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 239000003546 flue gas Substances 0.000 title claims abstract description 142
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 36
- 230000023556 desulfurization Effects 0.000 title claims abstract description 36
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 16
- 230000001276 controlling effect Effects 0.000 title claims abstract description 9
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 168
- 230000008859 change Effects 0.000 claims description 24
- 229910021529 ammonia Inorganic materials 0.000 claims description 12
- 238000012937 correction Methods 0.000 claims description 9
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 235000010269 sulphur dioxide Nutrition 0.000 claims 21
- 239000004291 sulphur dioxide Substances 0.000 claims 7
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 230000015654 memory Effects 0.000 description 14
- 230000003009 desulfurizing effect Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 2
- 235000011130 ammonium sulphate Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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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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Abstract
The invention provides a method for regulating and controlling the liquid ammonia adding amount of a boiler flue gas desulfurization device, based on the method, the liquid ammonia adding amount can be corrected according to parameters such as sulfur dioxide index changes of a flue gas inlet and a flue gas outlet of the device, so that the liquid ammonia adding amount can be regulated in advance, the sensitivity is high, and the problems of large fluctuation range of sulfur dioxide index at the outlet, serious tailing of outlet flue gas and the like of the conventional desulfurization device can be effectively solved. The regulation and control method comprises the following steps: acquiring the raw flue gas flow F1 at the flue gas inlet of the boiler flue gas desulfurization device, the sulfur dioxide concentration N1 at the flue gas inlet, the net flue gas flow F2 at the flue gas outlet and the sulfur dioxide concentration N2 at the flue gas outlet, wherein the liquid ammonia dosage of the boiler flue gas desulfurization device is calculated and determined according to the following formula: liquid ammonia addition amount ═ ((F1 × N1) - (F2 × N2)) × 10‑6/1.88 xAxK wherein A isAnd K is a preset liquid ammonia adding amount weighting coefficient.
Description
Technical Field
The invention relates to a liquid ammonia dosage regulation and control technology of a boiler flue gas desulfurization device, in particular to a method for realizing the control of sulfur dioxide concentration index in outlet flue gas through liquid ammonia dosage regulation and control.
Background
The exhaust flue gas of the CFB boiler (circulating fluidized bed boiler) adopts an ammonia desulphurization technology, and the following problems are easy to occur in the operation process: serious tailing of discharged flue gas of a desulfurizing device, large material balance deviation (namely large ammonia loss and high ammonia escape of the device), poor crystallization effect of ammonium sulfate and clean flue gas SO2Frequent standard exceeding of indexes, blockage of a circulating spray head of the desulfurizing tower, serious material accumulation of internal parts of the desulfurizing tower and the like. While increasing the cost of environmental pollution penalty, the stable operation of the desulphurization device is severely restricted.
The above problems of the ammonia desulfurization apparatus must be controlled and solved, otherwise, the apparatus not only causes environmental pollution, but also faces high pollution discharge cost.
Disclosure of Invention
The invention provides a method for regulating and controlling the liquid ammonia adding amount of a boiler flue gas desulfurization device, based on the method, the liquid ammonia adding amount can be corrected according to parameters such as sulfur dioxide index changes of a flue gas inlet and a flue gas outlet of the device, so that the liquid ammonia adding amount can be regulated in advance, the sensitivity is high, and the problems of large fluctuation range of sulfur dioxide index at the outlet, serious tailing of outlet flue gas and the like of the conventional desulfurization device can be effectively solved.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a method for regulating and controlling the liquid ammonia adding amount of a boiler flue gas desulfurization device, which comprises the following steps:
acquiring the raw flue gas flow F1 at the flue gas inlet of the boiler flue gas desulfurization device, the sulfur dioxide concentration N1 at the flue gas inlet, the net flue gas flow F2 at the flue gas outlet and the sulfur dioxide concentration N2 at the flue gas outlet, wherein the liquid ammonia dosage of the boiler flue gas desulfurization device is calculated and determined according to the following formula:
liquid ammonia addition amount ═ ((F1 × N1) - (F2 × N2)) × 10-6/1.88×A×K
And A is a preset theoretical liquid ammonia adding quantity correction coefficient, and K is a preset liquid ammonia adding quantity weighting coefficient. In the formula, the unit of the related flue gas flow is Nm3H, the sulfur dioxide concentration referred to corresponds to mg/Nm3。
Further, when the concentration of sulfur dioxide at the flue gas outlet is N2<15mg/Nm3The preset liquid ammonia adding quantity weighting coefficient K is in accordance with the sulfur dioxide concentration N2 at the flue gas outlet<15mg/Nm3The different time for which the level of (c) is maintained is evaluated as follows:
when the duration is less than or equal to 2min, K is 0.98;
when the duration is more than 2min and less than or equal to 4min, K is 0.96;
when the duration is more than 4min and less than or equal to 6min, K is 0.94;
when the duration is more than 6min and less than or equal to 8min, K is 0.92;
when the duration is more than 8min, K is 0.90;
when the concentration N2 of sulfur dioxide at the flue gas outlet is more than or equal to 15mg/Nm3And presetting the value of the preset liquid ammonia adding quantity weighting coefficient K according to the change rate C of the sulfur dioxide concentration of the flue gas outlet.
Further, when the concentration N2 of sulfur dioxide at the flue gas outlet is more than or equal to 15mg/Nm3And less than or equal to 20mg/Nm3When the K value is in the range of 1.05-1.45;
when the concentration N2 of the sulfur dioxide at the flue gas outlet is more than 20mg/Nm3And is less than or equal to 25mg/Nm3When the K value is in the range of 1.1-1.45;
when the concentration N2 of the sulfur dioxide at the flue gas outlet is more than 25mg/Nm3And less than or equal to 30mg/Nm3When the K value is in the range of 1.15-1.5;
when the concentration of sulfur dioxide at the flue gas outlet is N2 >, the flue gas outlet is connected with the flue gas outlet30mg/Nm3And is less than or equal to 45mg/Nm3When the K value is in the range of 1.2-1.5;
when the concentration N2 of the sulfur dioxide at the flue gas outlet is more than 45mg/Nm3When the value of K is in the range of 1.25-1.6.
Further, when the concentration N2 of sulfur dioxide at the flue gas outlet is more than or equal to 15mg/Nm3And less than or equal to 20mg/Nm3And then, the K is valued according to the change rate C of the sulfur dioxide concentration of the flue gas outlet in the following mode:
when C <0, K ═ 1.05;
when C is more than or equal to 0 and less than 0.1, K is 1.05;
when C is more than or equal to 0.1 and less than 0.2, K is 1.2;
when C is more than or equal to 0.2 and less than 0.4, K is 1.3;
when C is more than or equal to 0.4, K is 1.45.
Further, when the concentration N2 of sulfur dioxide at the flue gas outlet is more than 20mg/Nm3And is less than or equal to 25mg/Nm3And then, the K is valued according to the change rate C of the sulfur dioxide concentration of the flue gas outlet in the following mode:
when C <0, K ═ 1.1;
when C is more than or equal to 0 and less than 0.1, K is 1.1;
when C is more than or equal to 0.1 and less than 0.2, K is 1.15;
when C is more than or equal to 0.2 and less than 0.4, K is 1.25;
when C is more than or equal to 0.4, K is 1.45.
Further, when the concentration of sulfur dioxide N2 at the flue gas outlet is more than 25mg/Nm3And less than or equal to 30mg/Nm3And then, the K is valued according to the change rate C of the sulfur dioxide concentration of the flue gas outlet in the following mode:
when C <0, K ═ 1.15;
when C is more than or equal to 0 and less than 0.1, K is 1.15;
when C is more than or equal to 0.1 and less than 0.2, K is 1.2;
when C is more than or equal to 0.2 and less than 0.4, K is 1.25;
when C is more than or equal to 0.4, K is 1.5.
Further, when the concentration N2 of sulfur dioxide at the flue gas outlet is more than 30mg/Nm3And is less than or equal to 45mg/Nm3And then, the K is valued according to the change rate C of the sulfur dioxide concentration of the flue gas outlet in the following mode:
when C <0, K ═ 1.2;
when C is more than or equal to 0 and less than 0.1, K is 1.2;
when C is more than or equal to 0.1 and less than 0.2, K is 1.2;
when C is more than or equal to 0.2 and less than 0.4, K is 1.25;
when C is more than or equal to 0.4, K is 1.5.
Further, when the concentration N2 of sulfur dioxide at the flue gas outlet is more than 45mg/Nm3And then, the K is valued according to the change rate C of the sulfur dioxide concentration of the flue gas outlet in the following mode:
when C is more than or equal to 0, K is 1.6;
when C <0, K is 1.25.
Further, the value range of the preset theoretical liquid ammonia adding amount correction coefficient A is 0.8-1.4.
Further, the boiler flue gas desulfurization device is an ammonia desulfurization device.
The technical scheme provided by the invention has the following beneficial effects:
the regulation and control method of the invention is realized by controlling the SO at the flue gas outlet and the inlet of the desulphurization device2Concentration, especially different levels of sulfur dioxide concentration at the flue gas outlet, and different change rates and amplitudes of the sulfur dioxide concentration at the flue gas outlet at higher levels are combined to draft different weighting coefficients of liquid ammonia dosage, and in the operation process, through coefficient correction, advanced adjustment of the liquid ammonia dosage can be realized, and outlet SO can be realized2The sensitivity of regulation is increased by one order of magnitude to ensure that SO2The index regulation and control process is easier to realize intellectualization and refinement, and the clean flue gas SO is improved2Stable index and qualified rate, and is favorable for realizing clean flue gas SO of boiler2The indexes are ultra-low emission.
Drawings
FIG. 1 is a field diagram of the cleaning of a desulfurizing tower during a shutdown for maintenance before modification;
FIG. 2 is a field diagram of the cleaning of the desulfurizing tower during the parking maintenance before the modification;
FIG. 3 is a field diagram of a modified desulfurization device stopped without accumulated material at the bottom of the desulfurization tower, and without cleaning by an organization personnel;
FIG. 4 is a photograph showing the exhaust gas discharged from the outlet of the desulfurizing tower before the reforming, showing the tailing phenomenon and the full range of the ammonia escape index (10 mg/Nm)3)；
FIG. 5 shows that the boiler outlet flue gas after the transformation has no obvious tailing phenomenon, and the ammonia escape is stably controlled to be 3mg/Nm3Inside live photos.
Fig. 6 is a schematic diagram of a hardware structure of an electronic device for executing the regulation method of the present invention.
Detailed Description
In order to better understand the technical solution of the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Example (b):
the invention provides a method for regulating and controlling the liquid ammonia adding amount of a boiler flue gas desulfurization device, which mainly comprises the following steps:
acquiring the raw flue gas flow F1 at the flue gas inlet of the boiler flue gas desulfurization device, the sulfur dioxide concentration N1 at the flue gas inlet, the net flue gas flow F2 at the flue gas outlet and the sulfur dioxide concentration N2 at the flue gas outlet, and calculating and determining the liquid ammonia adding amount of the boiler flue gas desulfurization device according to the following formula so as to adjust the adding amount of the liquid ammonia:
liquid ammonia addition amount ═ ((F1 × N1) - (F2 × N2)) × 10-6/1.88×A×K
And A is a preset theoretical liquid ammonia adding quantity correction coefficient, and K is a preset liquid ammonia adding quantity weighting coefficient.
The flow rate of the raw flue gas at the flue gas inlet is the flow rate of the flue gas from upstream to be desulfurized and purified, which is introduced into the flue gas inlet of the boiler flue gas desulfurization device; the "clean flue gas flow at the flue gas outlet" is the flow of the purified flue gas discharged from the flue gas outlet after the desulfurization and purification treatment is carried out by the boiler flue gas desulfurization device.
In particular, when the sulfur dioxide concentration N2 at the flue gas outlet<15mg/Nm3The preset liquid ammonia adding quantity weighting coefficient K is lower than 15mg/Nm according to the sulfur dioxide concentration N2 at the flue gas outlet3The different time of the level of (a) is evaluated as follows:
when N2<15mg/Nm3The duration time is less than or equal to 2min, and K is 0.98; when N2<15mg/Nm3The duration time is more than 2min and less than or equal to 4min, and K is 0.96; when N2<15mg/Nm3The duration time is more than 4min and less than or equal to 6min, and K is 0.94; when N2<15mg/Nm3The duration is more than 6min and less than or equal to 8min, and K is 0.92; when N2<15mg/Nm3The duration of (b) is > 8min, K is 0.90.
When the concentration N2 of sulfur dioxide at the flue gas outlet is more than or equal to 15mg/Nm3And when the concentration of sulfur dioxide in the flue gas outlet is higher than the preset value, presetting the value of the preset liquid ammonia adding quantity weighting coefficient K according to the change rate C of the concentration of sulfur dioxide in the flue gas outlet. Wherein, the change rate C of the sulfur dioxide concentration at the flue gas outlet is the change quantity of the sulfur dioxide concentration at the flue gas outlet every second, and the average value of 5 seconds is taken as the change rate C.
More specifically, when the concentration of the sulfur dioxide at the flue gas outlet is more than or equal to 15mg/Nm3At different levels, different values of K are preset. Specifically, when the concentration N2 of sulfur dioxide at the flue gas outlet is more than or equal to 15mg/Nm3And less than or equal to 20mg/Nm3When the K value is in the range of 1.05-1.45; when the concentration of sulfur dioxide N2 at the flue gas outlet is more than 20mg/Nm3And is less than or equal to 25mg/Nm3When the K value is in the range of 1.1-1.45; when the concentration of sulfur dioxide N2 at the flue gas outlet is more than 25mg/Nm3And less than or equal to 30mg/Nm3When the K value is in the range of 1.15-1.5; when the concentration of sulfur dioxide N2 at the flue gas outlet is more than 30mg/Nm3And is less than or equal to 45mg/Nm3When the K value is in the range of 1.2-1.5; when the concentration of sulfur dioxide N2 at the flue gas outlet is more than 45mg/Nm3In this case, K is in the range of 1.25 to 1.6.
More specifically:
1) when the concentration N2 of sulfur dioxide at the flue gas outlet is more than or equal to 15mg/Nm3And less than or equal to 20mg/Nm3And then K is taken according to the change rate C of the sulfur dioxide concentration at the flue gas outlet in the following mode:
when C <0, K ═ 1.05;
when C is more than or equal to 0 and less than 0.1, K is 1.05;
when C is more than or equal to 0.1 and less than 0.2, K is 1.2;
when C is more than or equal to 0.2 and less than 0.4, K is 1.3;
when C is more than or equal to 0.4, K is 1.45.
2) When the concentration of sulfur dioxide N2 at the flue gas outlet is more than 20mg/Nm3And is less than or equal to 25mg/Nm3And then K is taken according to the change rate C of the sulfur dioxide concentration at the flue gas outlet in the following mode:
when C <0, K ═ 1.1;
when C is more than or equal to 0 and less than 0.1, K is 1.1;
when C is more than or equal to 0.1 and less than 0.2, K is 1.15;
when C is more than or equal to 0.2 and less than 0.4, K is 1.25;
when C is more than or equal to 0.4, K is 1.45.
3) When the concentration of sulfur dioxide N2 at the flue gas outlet is more than 25mg/Nm3And less than or equal to 30mg/Nm3And then K is taken according to the change rate C of the sulfur dioxide concentration at the flue gas outlet in the following mode:
when C <0, K ═ 1.15;
when C is more than or equal to 0 and less than 0.1, K is 1.15;
when C is more than or equal to 0.1 and less than 0.2, K is 1.2;
when C is more than or equal to 0.2 and less than 0.4, K is 1.25;
when C is more than or equal to 0.4, K is 1.5.
4) When the concentration of sulfur dioxide N2 at the flue gas outlet is more than 30mg/Nm3And is less than or equal to 45mg/Nm3And then K is taken according to the change rate C of the sulfur dioxide concentration at the flue gas outlet in the following mode:
when C <0, K ═ 1.2;
when C is more than or equal to 0 and less than 0.1, K is 1.2;
when C is more than or equal to 0.1 and less than 0.2, K is 1.2;
when C is more than or equal to 0.2 and less than 0.4, K is 1.25;
when C is more than or equal to 0.4, K is 1.5.
5) When the concentration of sulfur dioxide N2 at the flue gas outlet is more than 45mg/Nm3While K varies according to the concentration of sulfur dioxide at the flue gas outletThe rate of change C is valued as follows:
when C is more than or equal to 0, K is 1.6;
when C <0, K is 1.25.
In the formula, the preset theoretical liquid ammonia adding amount correction coefficient A is a correction coefficient set according to an actual working condition, the measurement deviation of the instrument and the working condition change are compensated, and the correction coefficient A can be specifically between 0.8 and 1.4.
The regulation and control method provided by the invention can be implemented in an automatic control mode. For example, a storage medium may be provided that stores computer instructions for performing all the steps of the conditioning method as described above when the computer executes the computer instructions.
As shown in fig. 6, fig. 6 is a schematic diagram of a hardware structure of an electronic device for executing the regulation method provided by the embodiment of the present invention, and the schematic diagram mainly includes: at least one processor 51; and a memory 52 communicatively coupled to the at least one processor 51; the memory 52 stores instructions executable by the processor 51, and the instructions are executed by the at least one processor 51 to enable the at least one processor 51 to execute the regulation method as described above.
The electronic device performing the above-described regulation method may further include: an input device 53 and an output device 54.
The processor 51, the memory 52, the input device 53, and the output device 54 may be connected by a bus or other means, and fig. 6 illustrates an example of a bus connection.
The memory 52 is a non-volatile computer-readable storage medium, and can be used for storing non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the regulation method in the embodiment of the present application. The processor 51 executes various functional applications and data processing by executing nonvolatile software programs, instructions, and modules stored in the memory 52, that is, implements the regulation method in the above-described embodiment.
The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data region may store data created by use of the above-described regulation method, or the like. Further, the memory 52 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 52 optionally includes memory located remotely from the processor 51, and these remote memories may be connected over a network to a device that performs the conditioning methods described above. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Input device 53 may receive input user clicks and generate signal inputs related to user settings and functional control of the above-described conditioning methods. The output device 54 may include a display device such as a display screen.
When the one or more modules are stored in the memory 52, the regulation method in the above-described embodiment is performed when executed by the one or more processors 51.
The product can execute the method provided by the embodiment of the application, and has the corresponding functional modules and beneficial effects of the execution method.
The electronic device described in the embodiments of the present invention may exist in various forms, including but not limited to:
(1) an Electronic Control Unit (ECU) is also called a "traveling computer" or a "vehicle-mounted computer". The digital signal processor mainly comprises a microprocessor (CPU), a memory (ROM and RAM), an input/output interface (I/O), an analog-to-digital converter (A/D), a shaping circuit, a driving circuit and other large-scale integrated circuits.
(2) A mobile communication device: such devices are characterized by mobile communications capabilities and are primarily targeted at providing voice, data communications. Such terminals include: smart phones (e.g., iphones), multimedia phones, functional phones, and low-end phones, among others.
(3) Ultra mobile personal computer device: the equipment belongs to the category of personal computers, has calculation and processing functions and generally has the characteristic of mobile internet access. Such terminals include: PDA, MID, and UMPC devices, etc.
(4) A portable entertainment device: such devices can display and play multimedia content. This type of device comprises: audio, video players (e.g., ipods), handheld game consoles, electronic books, and smart toys and portable car navigation devices.
(5) A server: the device for providing the computing service comprises a processor, a hard disk, a memory, a system bus and the like, and the server is similar to a general computer architecture, but has higher requirements on processing capacity, stability, reliability, safety, expandability, manageability and the like because of the need of providing high-reliability service.
(6) And other electronic devices with data interaction functions.
According to the method for regulating and controlling the liquid ammonia dosage of the boiler flue gas desulfurization device, the weighting coefficient K of the liquid ammonia dosage is preset for different levels of the sulfur dioxide concentration at the flue gas outlet, and when the sulfur dioxide concentration N2 at the flue gas outlet is more than or equal to 15mg/Nm3In the process, different liquid ammonia adding amount weighting coefficients are drawn up according to different change rates and amplitudes of the concentration of sulfur dioxide at the flue gas outlet, and the coefficients are corrected at any time in the operation process.
In a boiler flue gas desulfurization device based on ammonia desulfurization, before the method is adopted to regulate and control the liquid ammonia adding amount, the manual regulation is adopted by two main operation positions, and the problems are easily caused: clean flue gas SO2Frequent standard exceeding, blockage of a circulating spray head of the desulfurizing tower, serious material accumulation of internal parts of the desulfurizing tower (shown in figures 1 and 2), serious tailing phenomenon (shown in figure 4) and a series of problems that aerosol of an ammonia desulfurizing device and ammonia escape cannot be controlled and the like. Before transformation, the fluctuation range of the sulfur dioxide index of the flue gas at the outlet of the desulfurizing tower is very large and reaches 0-1000mg/Nm3。
After modification, the regulation and control method provided by the invention is adopted to regulate and control the liquid ammonia dosage, and the ammonia escape of the purified flue gas is reduced to 3mg/Nm3The discharged smoke of the chimney is not trailing all the year round (see figure 5); when the utilization rate of liquid ammonia rises, the flue gas SO at the outlet2The index percent of pass is improved from 95.6 percent to 99.9 percent; the utilization efficiency of liquid ammonia is improved; the particle size of ammonium sulfate crystal particles in the concentration section of the desulfurization device is determined by the previous particle size<The grain size is 0.5mm, the grain size is increased to 0.5mm-2mm, and the crystallization quality is improved; the abrasion degree of spare parts is greatly reduced, and the maintenance cost is reduced; the working strength of post master operation is greatly reduced, and the number of the desulfurization central control master operation is reduced from two to one in the initial operation stage of the device; outlet SO2The index adjustment is changed from the previous purely manual adjustment to the automatic adjustment. After the transformation, the desulfurization device is stopped, no material is accumulated at the bottom of the desulfurization tower, and no organization personnel is required to clean the desulfurization tower (see fig. 3); after the modification, the fluctuation range of the sulfur dioxide index of the flue gas at the outlet of the desulfurizing tower is greatly reduced and reaches 15-30mg/Nm3。
It will be appreciated by those skilled in the art that modifications or adaptations to the invention may be made in light of the teachings of the present specification. Such modifications or adaptations are intended to be within the scope of the present invention as defined in the claims.
Claims (10)
1. A method for regulating and controlling the liquid ammonia adding amount of a boiler flue gas desulfurization device is characterized by comprising the following steps:
acquiring the raw flue gas flow F1 at the flue gas inlet of the boiler flue gas desulfurization device, the sulfur dioxide concentration N1 at the flue gas inlet, the net flue gas flow F2 at the flue gas outlet and the sulfur dioxide concentration N2 at the flue gas outlet, wherein the liquid ammonia dosage of the boiler flue gas desulfurization device is calculated and determined according to the following formula:
liquid ammonia addition amount ═ ((F1 × N1) - (F2 × N2)) × 10-6/1.88×A×K
And A is a preset theoretical liquid ammonia adding quantity correction coefficient, and K is a preset liquid ammonia adding quantity weighting coefficient.
2. A conditioning method according to claim 1, characterized in that when the sulphur dioxide concentration N2 at the flue gas outlet is reached<15mg/Nm3The preset liquid ammonia adding quantity weighting coefficient K is in accordance with the sulfur dioxide concentration N2 at the flue gas outlet<15mg/Nm3The different time for which the level of (c) is maintained is evaluated as follows:
when the duration is less than or equal to 2min, K is 0.98;
when the duration is more than 2min and less than or equal to 4min, K is 0.96;
when the duration is more than 4min and less than or equal to 6min, K is 0.94;
when the duration is more than 6min and less than or equal to 8min, K is 0.92;
when the duration is more than 8min, K is 0.90;
when the concentration N2 of sulfur dioxide at the flue gas outlet is more than or equal to 15mg/Nm3And presetting the value of the preset liquid ammonia adding quantity weighting coefficient K according to the change rate C of the sulfur dioxide concentration of the flue gas outlet.
3. A regulating method according to claim 2, characterized in that when the sulphur dioxide concentration N2 at the flue gas outlet is more than or equal to 15mg/Nm3And less than or equal to 20mg/Nm3When the K value is in the range of 1.05-1.45;
when the concentration N2 of the sulfur dioxide at the flue gas outlet is more than 20mg/Nm3And is less than or equal to 25mg/Nm3When the K value is in the range of 1.1-1.45;
when the concentration N2 of the sulfur dioxide at the flue gas outlet is more than 25mg/Nm3And less than or equal to 30mg/Nm3When the K value is in the range of 1.15-1.5;
when the concentration N2 of the sulfur dioxide at the flue gas outlet is more than 30mg/Nm3And is less than or equal to 45mg/Nm3When the K value is in the range of 1.2-1.5;
when the concentration N2 of the sulfur dioxide at the flue gas outlet is more than 45mg/Nm3When the value of K is in the range of 1.25-1.6.
4. A regulating method according to claim 3, characterized in that when the sulphur dioxide concentration N2 at the flue gas outlet is more than or equal to 15mg/Nm3And less than or equal to 20mg/Nm3And then, the K is valued according to the change rate C of the sulfur dioxide concentration of the flue gas outlet in the following mode:
when C <0, K ═ 1.05;
when C is more than or equal to 0 and less than 0.1, K is 1.05;
when C is more than or equal to 0.1 and less than 0.2, K is 1.2;
when C is more than or equal to 0.2 and less than 0.4, K is 1.3;
when C is more than or equal to 0.4, K is 1.45.
5. A method of regulating as claimed in claim 3, characterized in that when the flue gas outlet sulphur dioxide concentration N2 > 20mg/Nm3And is less than or equal to 25mg/Nm3And then, the K is valued according to the change rate C of the sulfur dioxide concentration of the flue gas outlet in the following mode:
when C <0, K ═ 1.1;
when C is more than or equal to 0 and less than 0.1, K is 1.1;
when C is more than or equal to 0.1 and less than 0.2, K is 1.15;
when C is more than or equal to 0.2 and less than 0.4, K is 1.25;
when C is more than or equal to 0.4, K is 1.45.
6. A method of regulating as claimed in claim 3, characterized in that when the flue gas outlet sulphur dioxide concentration N2 > 25mg/Nm3And less than or equal to 30mg/Nm3And then, the K is valued according to the change rate C of the sulfur dioxide concentration of the flue gas outlet in the following mode:
when C <0, K ═ 1.15;
when C is more than or equal to 0 and less than 0.1, K is 1.15;
when C is more than or equal to 0.1 and less than 0.2, K is 1.2;
when C is more than or equal to 0.2 and less than 0.4, K is 1.25;
when C is more than or equal to 0.4, K is 1.5.
7. A method of regulating as claimed in claim 3, characterized in that when the flue gas outlet sulphur dioxide concentration N2 > 30mg/Nm3And is less than or equal to 45mg/Nm3And then, the K is valued according to the change rate C of the sulfur dioxide concentration of the flue gas outlet in the following mode:
when C <0, K ═ 1.2;
when C is more than or equal to 0 and less than 0.1, K is 1.2;
when C is more than or equal to 0.1 and less than 0.2, K is 1.2;
when C is more than or equal to 0.2 and less than 0.4, K is 1.25;
when C is more than or equal to 0.4, K is 1.5.
8. A method of regulating as claimed in claim 3, characterized in that when the flue gas outlet sulphur dioxide concentration N2 > 45mg/Nm3And then, the K is valued according to the change rate C of the sulfur dioxide concentration of the flue gas outlet in the following mode:
when C is more than or equal to 0, K is 1.6;
when C <0, K is 1.25.
9. A regulation and control method according to any one of claims 1 to 8, characterized in that the value of the preset theoretical liquid ammonia dosage correction factor A is in the range of 0.8 to 1.4.
10. The regulation method of any one of claims 1-8, wherein the boiler flue gas desulfurization unit is an ammonia desulfurization unit.
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