CN115040995A - Lime slurry throttle adjusting method for treating waste gas of garbage power plant based on semidry method - Google Patents
Lime slurry throttle adjusting method for treating waste gas of garbage power plant based on semidry method Download PDFInfo
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 118
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 118
- 239000004571 lime Substances 0.000 title claims abstract description 118
- 239000002002 slurry Substances 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 80
- 239000002912 waste gas Substances 0.000 title claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 74
- 239000003546 flue gas Substances 0.000 claims description 74
- 239000007789 gas Substances 0.000 claims description 24
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 12
- 238000011282 treatment Methods 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000011269 treatment regimen Methods 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 claims description 3
- 239000010908 plant waste Substances 0.000 claims 2
- 239000000463 material Substances 0.000 abstract description 5
- 230000004044 response Effects 0.000 abstract description 4
- 230000002378 acidificating effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- 239000007788 liquid Substances 0.000 description 19
- 230000007613 environmental effect Effects 0.000 description 12
- 238000006477 desulfuration reaction Methods 0.000 description 6
- 230000023556 desulfurization Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000004056 waste incineration Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000004069 differentiation Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000000738 capillary electrophoresis-mass spectrometry Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 239000002351 wastewater 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
- B01D53/30—Controlling by gas-analysis apparatus
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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
-
- 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
- B01D53/68—Halogens or halogen compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
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- B01D2257/204—Inorganic halogen compounds
- B01D2257/2045—Hydrochloric acid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
- B01D2258/0291—Flue gases from waste incineration plants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
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Abstract
The invention discloses a lime slurry throttle adjusting method for treating waste gas of a garbage power plant based on a semidry method, which optimizes the automatic adjustment accuracy of the semidry method lime slurry throttle, simultaneously considers the problems of material consumption saving, equipment protection and process conditions, ensures that the system can save the consumption of lime slurry as far as possible while protecting equipment safety in the normal operation process, ensures that acidic environment-friendly parameters cannot exceed the standard when the garbage quality is poor, ensures the speed of stable switching and adjustment response of a control mode compared with the prior automatic control logic, ensures more accurate automatic control, reduces the workload of operators for handling disks, and is beneficial to the stable operation of the garbage power plant.
Description
Technical Field
The invention relates to the technical field of waste gas treatment of incinerators of garbage power plants, in particular to a method for adjusting a lime slurry throttle valve for treating waste gas of a garbage power plant based on a semidry method.
Background
Flue gas generated by burning garbage in garbage incineration power plant contains a large amount of HCL and SO 2 The gas must be deacidified to meet the specified emission standard. Otherwise, it will face strict administrative penalties and very bad social impact. The common deacidification processes at present comprise dry deacidification, semi-dry deacidification and wet deacidification. Although the deacidification efficiency of the wet process is high, the construction cost and the operation cost are very high, and waste water is generated, so most waste incineration power generation projects do not have the matched wet process. The semidry process has moderate construction cost, low operation cost and high deacidification efficiency. The dry process has low construction cost and low operation cost, but has low deacidification reaction efficiency, large lime consumption and large fly ash total amount. Therefore, most of the current waste incineration power plants adopt a semi-dry method and a wet method process, wherein the wet method process is used as a backup treatment process of the semi-dry method process.
The semi-dry desulfurization process is to remove Ca (OH) 2 Solution is thrown into the deacidification tower after atomizing through high-speed rotatory atomizer, take place neutralization reaction with the acid gas in the deacidification tower and carry out flue gas desulfurization and handle, and through passing through the NaOH solution with the flue gas during wet process deacidification technology, make NaOH take place neutralization reaction with the acid material in the flue gas and carry out flue gas deacidification and handle, consequently in garbage power factory exhaust-gas treatment, carry out preliminary flue gas desulfurization to the flue gas through the semidry method system earlier, and make it detach the large granule impurity in the flue gas through the sack, at last through the wet process system to the flue gas and then secondary deacidification, make the flue gas that discharges out accord with the environmental protection standard. Due to the fluctuation of the quality of the garbage burned in the garbage incineration power plant, HCL and SO contained in the flue gas generated by burning the garbage 2 Also, there are fluctuations in the actual content of (A) which lead to HCL and SO in the flue gas 2 When the actual value is less, although the discharged flue gas can be ensured to meet the environmental protection standard after the flue gas is desulfurized by the semidry method system and secondarily deacidified by the wet method system, the flue gas is treated by the semidry method system to cause resource waste, and HCL and SO in the flue gas are generated 2 When the actual value is more, the flue gas also contains more HCL and SO after being desulfurized by the semidry method system 2 Therefore, when the flue gas passes through a wet system, not only can excessive NaOH be consumed, but also the treated flue gas can have the problem of not meeting the environmental protection standard.
Disclosure of Invention
The invention discloses a lime slurry throttle adjusting method for treating waste gas of a garbage power plant based on a semidry method, and aims to solve the problem of how to provide a lime slurry throttle adjusting method which can save material consumption while ensuring that the discharged waste gas meets the environmental protection standard in the background technology.
In order to solve the technical problems, the following technical scheme is proposed:
a lime slurry throttle adjusting method for treating waste gas of a garbage power plant based on a semidry method comprises the following steps:
setting the set values of the acid gas content of the preset emission flue gas, wherein the set values comprise an HCL set value and an SO2 set value;
detecting actual values of the acid gas content of the actual discharged flue gas, wherein the actual values comprise an HCL actual value and an SO2 actual value;
comparing the actual value with the set value to judge a priority treatment strategy and automatically adjusting the opening of a lime slurry adjusting valve;
wherein the priority processing strategy comprises:
SO 2 a priority strategy for giving priority to SO in the flue gas 2 Adjusting the content to the SO 2 Setting a value;
and the HCL priority strategy is used for preferably adjusting the HCL content in the flue gas to the HCL set value.
Preferably, when said SO 2 Actual value greater than said SO 2 When the set value is reached, the SO is executed 2 A priority policy;
when the HCL actual value is greater than the HCL set value, the HCL priority strategy is executed.
Preferably, when said SO is performed 2 When the policy is prioritized, according to the SO 2 Actual value and said SO 2 Calculating the flow of the lime slurry by the deviation of the set value, and automatically adjusting the opening of the lime slurry adjusting valve;
when the HCL priority strategy is executed, calculating the flow of lime slurry according to the deviation of the actual HCL value and the set HCL value, and automatically adjusting the opening of a lime slurry adjusting valve.
Preferably, the calculation formula for calculating the lime slurry flow rate according to the deviation of the HCL actual value and the HCL set value is as follows:
wherein: u (t1) is the lime slurry flow rate, Kp is the proportional band, Ti is the integration time, Td is the differentiation time, and e (t1) is the deviation value of the HCL actual value and the HCL set value.
Preferably, according to the SO 2 Actual value and said SO 2 The formula for calculating the lime slurry flow rate by the deviation of the set value is as follows:
wherein: u (t2) is lime slurry flow rate, Kp is proportional band, Ti is integral time, Td is differential time, e (t2) is SO 2 Actually containing SO 2 Deviation value of set value.
Preferably, the SO 2 The priority strategy further comprises detecting the actual HCL value, comparing the actual HCL value with a set HCL value, and if the actual HCL value is greater than the set HCL value, determining that the actual HCL value is greater than the set HCL value, and controlling the SO according to the set HCL value 2 The priority policy is adjusted to the HCL priority policy.
Preferably, the method further comprises the steps of selecting to automatically adjust the opening of the lime slurry adjusting valve or manually adjusting the opening of the lime slurry adjusting valve, and manually setting the flow of the lime slurry according to working condition requirements if the opening of the manual lime slurry adjusting valve is selected.
Preferably, when an abnormal working condition occurs, the opening of the lime slurry adjusting valve is adjusted to be 0, and the opening of the lime slurry adjusting valve is switched from automatic adjustment to manual adjustment in a delayed manner.
Preferably, the method further comprises setting an upper limit value and a lower limit value of the lime slurry flow.
Preferably, when said actual value of HCL or said SO is present 2 And when the numerical value of the actual value fluctuates greatly, the opening of the automatic adjustment lime slurry adjusting valve is switched to the opening of the manual adjustment lime slurry adjusting valve.
Has the advantages that: the invention discloses a lime slurry throttle adjusting method for treating waste gas of a garbage power plant based on a semidry method, which optimizes the automatic adjustment accuracy of the semidry method lime slurry throttle, simultaneously considers the problems of material consumption saving, equipment protection and process conditions, ensures that the system can save the consumption of lime slurry as far as possible while protecting equipment safety in the normal operation process, ensures that acidic environment-friendly parameters cannot exceed the standard when the garbage quality is poor, ensures the speed of stable switching and adjustment response of a control mode compared with the prior automatic control logic, ensures more accurate automatic control, reduces the workload of operators for handling disks, and is beneficial to the stable operation of the garbage power plant.
Drawings
FIG. 1 is a flow chart of a method for controlling a throttle according to the present invention;
FIG. 2 is a flow chart of a method of controlling lime slurry flow according to the present invention;
FIG. 3 is a trend graph of the present invention for modulating HCL;
FIG. 4 is a diagram of the regulated SO of the present invention 2 A trend graph of (c).
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
The following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Flue gas generated by burning garbage in garbage incineration power plant contains a large amount of HCL and SO 2 The gas must be deacidified to meet the specified emission standard. In the treatment of the flue gas generated by burning the garbage in the garbage burning power plant, the flue gas is firstly subjected to flue gas desulfurization treatment through a semidry method system, large-particle impurities in the flue gas are removed through a cloth bag, then the flue gas is subjected to secondary deacidification through a wet method system, and finally the flue gas meeting the environmental protection standard is discharged.
Wherein the semidry system is prepared by mixing lime slurry (Ca (OH) 2 Solution) is atomized by a high-speed rotary atomizer and then is added into a deacidification tower and then is mixed with the deacidification towerThe acid gas in the flue gas is subjected to neutralization reaction, and then the flue gas is subjected to desulfurization treatment.
The invention relates to a method for adjusting a lime slurry throttle valve based on semidry method waste gas treatment of a garbage power plant, and please refer to fig. 1-4, which comprises the following steps:
setting the set values of the content of each acid gas in the discharged flue gas when the preset discharged flue gas is set, wherein the set values comprise an HCL set value and an SO2 set value;
when the actual discharged flue gas is detected, the actual values of the content of each acid gas in the discharged flue gas comprise an HCL actual value and an SO2 actual value;
the actual value of HCL and/or SO 2 Actual value and corresponding HCL setpoint or SO 2 Comparing and judging a priority processing strategy according to the set value, calculating the flow of the lime slurry according to the deviation of the lime slurry, and automatically adjusting the opening of the lime slurry adjusting valve, wherein the priority processing strategy comprises SO 2 Precedence policy and HCL precedence policy, SO 2 The priority strategy is to preferentially select SO in the flue gas 2 Adjusting the actual content to SO 2 Setting a value; the HCL priority strategy is to preferentially adjust the actual HCL content in the flue gas to the HCL set value.
When executing SO 2 When policy is prioritized, according to SO 2 Actual value and SO 2 Calculating the flow of the lime slurry according to the deviation of the set value, and then automatically adjusting the opening of the lime slurry adjusting valve according to the flow of the lime slurry; when the HCL priority strategy is executed, calculating the flow of lime slurry according to the deviation of the actual HCL value and the set HCL value, and then automatically adjusting the opening of the lime slurry adjusting valve according to the flow of the lime slurry.
Here, by comparing the actual value of HCL or SO 2 Actual value and corresponding HCL setpoint or SO 2 The set value is compared and judged to have a priority treatment strategy, and the aim is to treat the HCL and the SO in the flue gas after the flue gas is treated by a semidry method system when the flue gas generated by burning the garbage in a garbage incineration power plant is treated 2 Cannot be reduced to levels of HCL and SO meeting emission standards 2 The content of (A) in the flue gas, and thus secondary deacidification of the flue gas by a wet system, due to HCL and SO contained in the flue gas generated by burning the garbage in a garbage incineration power plant 2 Is stored at the actual contentIn the presence of fluctuations, this also results in HCL and SO in the flue gas 2 When the actual value is less, although the discharged flue gas can be ensured to meet the environmental protection standard after the flue gas is desulfurized by the semi-dry method system and secondarily deacidified by the wet method system, the flue gas can be wasted by resources when the semi-dry method system is used for treating the flue gas, and HCL and SO in the flue gas are wasted by resources 2 When the actual value is more, the flue gas also contains more HCL and SO after being desulfurized by the semidry method system 2 Therefore, when the flue gas passes through a wet system, not only can excessive NaOH be consumed, but also the problem that the treated flue gas does not meet the environmental protection standard exists, SO the invention uses the actual value of HCL or SO 2 Actual value and corresponding HCL setpoint or SO 2 Comparing set values to judge priority treatment strategies, and adjusting the lime slurry flow of the semi-dry method system through different priority treatment strategies to ensure that HCL and SO in flue gas generated by burning garbage in a garbage incineration power plant are desulfurized through the semi-dry method system 2 Meets the set standard (namely HCL and SO in the flue gas when entering the wet method) 2 Content) and then the discharged smoke after secondary deacidification by a wet method system meets the environmental protection standard.
In the embodiment, when the actual value of HCL in the flue gas generated by burning the waste in the waste incineration power plant is greater than the designed value of HCL, the HCL priority strategy is executed, when the HCL priority strategy is executed, the actual value of HCL is compared with the set value of HCL, the lime slurry flow is calculated according to the HCL deviation formula, and the lime slurry flow is controlled to make the HCL content in the flue gas generated by burning the waste in the waste incineration power plant meet the set value of HCL after deacidification is performed by the semidry method system, so as to ensure the stability of secondary deacidification in the wet method system.
The HCL deviation formula is:
wherein: u (t2) is the lime slurry flow rate, Kp is a proportional band (a proportional band is specially used in the Fox Polo DCS system), Ti is the integration time, Td is the differentiation time (the regulating variable has no hysteresis characteristic and is 0), and e (t1) is the deviation value of the HCL actual value and the HCL set value (positive feedback is the actual content minus the set value, and negative feedback is the actual content minus the actual value).
SO in flue gas generated by burning garbage in garbage incineration power plant 2 Actual value greater than SO 2 At design value, SO is performed 2 Priority policy in executing SO 2 When the policy is prioritized, SO is added 2 Actual value and SO 2 Comparing the set values and according to SO 2 Calculating the flow rate of lime slurry by a deviation formula, and controlling the flow rate of the lime slurry to ensure that SO contained in flue gas generated by burning garbage in a garbage incineration power plant is deacidified by a semidry method system 2 The content of the component (A) is in accordance with SO 2 And the set value further ensures the stability of secondary deacidification of the wet system. Preferably, when flue gas generated by burning garbage in a garbage incineration power plant is treated, the lime slurry is atomized by the atomizer in the semidry method system SO as to be mixed with HCL and SO in the flue gas 2 Deacidifying by reaction, namely adopting NaOH solution and HCL and SO in the flue gas in a wet system 2 The reaction further carries out secondary deacidification on the flue gas, however, in the semi-dry system desulfurization, the lime slurry and SO 2 The reaction is quicker, the treating capacity of the wet system to the HCL in the flue gas is influenced by the concentration of NaOH, the treating capacity of the wet system to the HCL is constant under the condition of constant NaOH concentration, and SO is implemented 2 When the strategy is prioritized, the actual content of HCL needs to be detected, and when the actual content of HCL exceeds the HCL set value, SO is added 2 The priority strategy is converted into an HCL priority strategy until the content of HCL in the flue gas meets the HCL set value, so that the treated flue gas meets the environmental protection standard.
Wherein the SO2 deviation formula is:
wherein: u (t2) is the lime slurry flow rate, Kp is the proportional band (the Fox Polo DCS system is particularly used in the proportional band), Ti is the integration time, Td is the differentiation time (the regulation variable has no hysteresis characteristic and is therefore 0), e (t2) is SO 2 Actually containing SO 2 Deviation of set value (positive feedback is actual content minus set value, negative feedback is actual content minus actual value).
Secondly, optimizing and adjusting the response speed, considering that the flow fluctuation of the lime slurry cannot be too large and simultaneously ensuring the stability of environmental protection indexes, controlling the change of the opening of a valve through the change of the required flow, and setting the value of a proportional band in an HCL deviation formula as 75 SO 2 The value of a proportional band in the deviation formula is set to 320, so that the response speed is optimized and adjusted while the stability of the environmental protection index is ensured.
In this embodiment, still including selecting the aperture of automatically regulated lime thick liquid governing valve or the aperture of manual regulation lime thick liquid governing valve, in the use, adjust the regulation mode that lime will the governing valve aperture through operating personnel's actual demand, if select the aperture of manual regulation lime thick liquid governing valve, operating personnel sets for lime thick liquid flow according to the operating mode demand is manual, and then control the aperture of lime thick liquid governing valve, and select the aperture of automatically regulated lime thick liquid governing valve, then can be according to HCL priority strategy and SO priority strategy 2 And regulating the flow of the lime slurry by a priority strategy, and further controlling the opening of the lime slurry regulating valve.
In this embodiment, the method further includes operating condition detection, when an abnormal operating condition occurs, the opening of the lime slurry adjusting valve becomes 0, and the opening of the automatic lime slurry adjusting valve is switched to the opening of the manual lime slurry adjusting valve in a delayed manner, wherein the abnormal operating condition includes the following conditions:
when an atomizer of a semi-dry method system stops, the opening of a lime slurry adjusting valve is changed into 0, and the opening of the lime slurry adjusting valve is manually adjusted after 1S delay;
when the semi-dry method system is triggered by sudden stop, the opening of the lime slurry adjusting valve is changed into 0, and the opening of the lime slurry adjusting valve is manually adjusted after 1S delay;
and thirdly, when the flow of the lime slurry becomes a dead point, the control mode of the lime slurry adjusting valve is to manually adjust the opening of the lime slurry adjusting valve.
In this embodiment, still including setting up the upper limit value and the lower limit value of lime thick liquid flow, through setting up the upper limit value and the lower limit value of lime thick liquid flow, guarantee that the pipeline is full of to liquid in the lime thick liquid pipeline all the time, thereby prevent that the lime thick liquid pipeline from causing lime thick liquid to solidify because of the lime thick liquid flow is low and stopping up the pipeline, simultaneously, set up the lower limit value for preventing pipeline stop up lime thick liquid flow and can not be less than 1500 t/h.
In this example, when the actual value of HCL, SO 2 When one of the actual values fluctuates greatly, the flow fluctuation of the lime slurry is too large, and the opening of the lime slurry adjusting valve is automatically adjusted, SO that the acid gas in the flue gas cannot be effectively removed, and the actual value of HCL or SO appears 2 When the numerical value of actual value appears great fluctuation, the aperture of automatically regulated lime thick liquid governing valve switches into the aperture of manual regulation lime thick liquid governing valve, and then control lime thick liquid flow change through the aperture of manual regulation lime thick liquid governing valve, and then prevents that acid gas in the unable effective flue gas of getting rid of aperture of automatically regulated lime thick liquid governing valve, the phenomenon that acid gas content exceeds standard appears when leading to fume emission.
For example, when the quality of refuse burned in a refuse burning power plant changes, HCL or SO in flue gas generated by burning refuse 2 Will fluctuate greatly, i.e. SO 2 The content suddenly rises to 20mg/m 3 Above or with a sudden increase of 5mg/m in HCL content 3 In the above way, the opening degree adjusting mode of the lime slurry adjusting valve is switched to manual adjustment, and the lime slurry adjusting valve is switched back to automatic adjustment after the operation condition is stable, so that the phenomenon that the content of acidic gas exceeds the standard during the emission of flue gas is effectively prevented.
The advantages are that: after the adjusting method of the lime slurry throttle is optimized, the actual operation condition is obviously improved, and can be seen from the historical trends of fig. 3 and 4, wherein SO in fig. 3 and 4 2 The content and HCL content are SO 2 And the reduced value of the actual content of HCL is calculated based on the CEMS environmental protection data reduced formula, and HCL and SO are regulated 2 The method can be controlled within a reasonable range, the workload of operators is reduced, compared with the prior automatic control logic, the method has more stable adjustment switching and more stable adjustment responseThe speed is quicker, the protection to the system is more comprehensive, the consumption of materials is more saved, the operation to the equipment per se is safer, and the long-term effective operation of the garbage power plant is facilitated.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (10)
1. A lime slurry throttle adjusting method based on semidry method waste gas treatment of a garbage power plant is characterized by comprising the following steps:
setting the set values of the acid gas content of the preset emission flue gas, including HCL set value and SO 2 Setting a value;
detecting actual values of the acid gas content of the actual discharged flue gas, including HCL actual value and SO 2 An actual value;
comparing the actual value with the set value to judge a priority treatment strategy and automatically adjusting the opening of a lime slurry adjusting valve;
wherein the priority processing strategy comprises:
SO 2 a priority strategy for giving priority to SO in the flue gas 2 Adjusting the content to the SO 2 Setting a value;
and the HCL priority strategy is used for preferably adjusting the HCL content in the flue gas to the HCL set value.
2. The method for adjusting the lime slurry throttle of the semi-dry process garbage power plant exhaust gas based on claim 1, wherein when the SO is used, the adjustment is performed 2 Actual value greater than said SO 2 When the set value is reached, the SO is executed 2 A priority policy;
when the HCL actual value is greater than the HCL set value, the HCL priority strategy is executed.
3. The method for adjusting the lime slurry throttle of an exhaust gas of a semi-dry processing garbage power plant according to claim 1, wherein the SO is performed while the SO is being performed 2 When the policy is prioritized, according to the SO 2 Actual value and said SO 2 Calculating the flow of the lime slurry by the deviation of the set value, and automatically adjusting the opening of the lime slurry adjusting valve;
when the HCL priority strategy is executed, calculating the flow of lime slurry according to the deviation of the actual HCL value and the set HCL value, and automatically adjusting the opening of a lime slurry adjusting valve.
4. The method for adjusting the lime mud throttle valve based on semi-dry process waste power plant exhaust gas of claim 3, wherein the calculation formula for calculating the lime mud flow rate according to the deviation of the HCL actual value and the HCL set value is as follows:
wherein: u (t) 1 ) For lime slurry flow, Kp is a proportional band, Ti is an integral time, Td is a derivative time, e (t) 1 ) Is the deviation value of the HCL actual value and the HCL set value.
5. Method for adjusting lime slurry throttle of semi-dry process based waste power plant exhaust gas according to claim 3, characterized in that according to the SO 2 Actual value and said SO 2 The formula for calculating the lime slurry flow rate by the deviation of the set value is as follows:
wherein: u (t) 2 ) For lime slurry flow, Kp is a proportional band, Ti is an integral time, Td is a derivative time, e (t) 2 ) Is SO 2 Actually containing SO 2 Deviation value of set value.
6. The method for adjusting the lime slurry throttle of the semi-dry process garbage power plant exhaust gas according to claim 2, wherein the SO is used for adjusting the lime slurry throttle 2 The priority strategy further comprises detecting the actual HCL value, comparing the actual HCL value with a set HCL value, and if the actual HCL value is greater than the set HCL value, determining that the actual HCL value is greater than the set HCL value, and controlling the SO according to the set HCL value 2 The priority policy is adjusted to the HCL priority policy.
7. The method for adjusting the lime slurry throttle valve based on semi-dry process waste power plant waste gas of claim 2, characterized by further comprising selecting to automatically adjust the opening of the lime slurry regulating valve or manually adjust the opening of the lime slurry regulating valve, and if the opening of the lime slurry regulating valve is selected to be manually adjusted, manually setting the lime slurry flow according to the working condition requirement.
8. The method for adjusting the lime mud throttle valve based on semi-dry process waste power plant waste gas of claim 7, characterized in that when abnormal conditions occur, the opening of the lime mud regulating valve is adjusted to 0, and the opening of the lime mud regulating valve is switched from automatic regulation to manual regulation in a delayed manner.
9. The method for adjusting the lime mud throttle valve based on semi-dry processing of waste power plant exhaust gas of claim 2, characterized by further comprising setting an upper limit value and a lower limit value of the lime mud flow rate.
10. Method for adjusting the lime slurry throttle of a semidry process refuse power plant exhaust gas based on claim 7, characterized in that the actual value of HCL or SO is taken when the actual value of HCL or SO is present 2 And when the numerical value of the actual value fluctuates greatly, the opening of the automatic adjustment lime slurry adjusting valve is switched to the opening of the manual adjustment lime slurry adjusting valve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117406585A (en) * | 2023-12-14 | 2024-01-16 | 光大环保技术装备（常州）有限公司 | Genetic algorithm-based lime slurry regulating valve regulating system and regulating method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000317263A (en) * | 1999-05-17 | 2000-11-21 | Nkk Corp | Method and device for treating waste gas |
| CN102728194A (en) * | 2012-07-11 | 2012-10-17 | 光大环保科技发展（北京）有限公司 | Method and device for fume purification treatment in waste incineration |
| CN105278567A (en) * | 2015-09-28 | 2016-01-27 | 光大环保技术研究院（深圳）有限公司 | Fuzzy control-based waste incineration flue gas purification control method and system |
| CN113041808A (en) * | 2021-03-23 | 2021-06-29 | 光大环保技术装备（常州）有限公司 | Method and system for controlling adding amount of lime slurry and cooling water in deacidification tower |
-
2022
- 2022-07-08 CN CN202210799491.5A patent/CN115040995A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000317263A (en) * | 1999-05-17 | 2000-11-21 | Nkk Corp | Method and device for treating waste gas |
| CN102728194A (en) * | 2012-07-11 | 2012-10-17 | 光大环保科技发展（北京）有限公司 | Method and device for fume purification treatment in waste incineration |
| CN105278567A (en) * | 2015-09-28 | 2016-01-27 | 光大环保技术研究院（深圳）有限公司 | Fuzzy control-based waste incineration flue gas purification control method and system |
| CN113041808A (en) * | 2021-03-23 | 2021-06-29 | 光大环保技术装备（常州）有限公司 | Method and system for controlling adding amount of lime slurry and cooling water in deacidification tower |
Non-Patent Citations (1)
| Title |
|---|
| 陈宗海等, 中国科学技术大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117406585A (en) * | 2023-12-14 | 2024-01-16 | 光大环保技术装备（常州）有限公司 | Genetic algorithm-based lime slurry regulating valve regulating system and regulating method |
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