CN113776066A - Deacidification control method for waste incineration boiler and related device - Google Patents

Deacidification control method for waste incineration boiler and related device Download PDF

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Publication number
CN113776066A
CN113776066A CN202111088976.5A CN202111088976A CN113776066A CN 113776066 A CN113776066 A CN 113776066A CN 202111088976 A CN202111088976 A CN 202111088976A CN 113776066 A CN113776066 A CN 113776066A
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hydrogen chloride
sulfur dioxide
deacidification
change rate
flue gas
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CN113776066B (en
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沈跃良
周杰联
钟俊
曾庭华
李千军
来笑蕊
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China Southern Power Grid Power Technology Co Ltd
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China Southern Power Grid Power Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/346—Controlling the process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/50—Control or safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/604—Hydroxides
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/20—Sulfur; Compounds thereof

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)

Abstract

The application discloses waste incineration boiler deacidification control method and relevant device, at first obtain the historical data that multiunit sulfur dioxide, hydrogen chloride correspond, compare sulfur dioxide and hydrogen chloride in every group data next, judge out the first flue gas that easily exceeds the standard, according to the least square principle, select a set of lime thick liquid flow and first flue gas that accord with the corresponding relation and carry out the fitting and obtain the corresponding relation formula of first flue gas to control lime thick liquid flow according to this relation formula. And monitoring the concentration value of sulfur dioxide and the concentration value of hydrogen chloride in the incinerator, monitoring the change rate of sulfur dioxide and the change rate of hydrogen chloride, and controlling a slaked lime dry powder fan to spray slaked lime into the deacidification tower when one factor exceeds the standard until the factors do not exceed the standard. The technical problem that in the prior art, the discharge of sulfur dioxide and hydrogen chloride often exceeds the standard due to the fact that the flow of lime slurry and the dry powder injection of slaked lime cannot be accurately controlled is solved.

Description

Deacidification control method for waste incineration boiler and related device
Technical Field
The application relates to the technical field of flue gas, in particular to a deacidification control method for a waste incineration boiler and a related device.
Background
In recent years, a large number of waste incineration boilers mainly comprising grate furnaces are built in China, and a large number of pollutants including nitrogen oxides, sulfur dioxide, hydrogen chloride and the like are generated after waste incineration and need to be purified by a flue gas treatment device. Wherein the acid gas is purified by spraying limestone slurry into the acid removal tower.
Because the inlet of the deacidification tower is generally lack of an accurate and reliable device for measuring the concentration of the original flue gas SO2 and HCL, the control method of the lime slurry of the deacidification tower at present mainly comprises the following steps: and (3) manually adjusting a lime slurry adjusting valve and a process water adjusting valve by an operator according to the concentrations of SO2 and HCL measured in the clean flue gas, and controlling the amount of the lime slurry sprayed into the deacidification tower, SO that SO2 and HCL in the clean flue gas are controlled within a certain concentration range, and when the concentrations of SO2 and HCL in the clean flue gas are judged to be increased to possibly exceed the standard, the operator starts a slaked lime dry powder spraying fan to spray slaked lime dry powder into the deacidification tower SO as to suppress the increase of the concentrations of SO2 and HCL in the clean flue gas.
Because the measurement of the concentrations of the clean flue gas SO2 and the HCL is delayed, the change of garbage components is unknown, and the monitoring of operators is not timely, the accurate intervention cannot be realized by manually judging the start and stop of the slaked lime dry powder injection fan, SO that the emission of SO2 and HCL often exceeds the standard.
Disclosure of Invention
The application provides a deacidification control method for a waste incineration boiler and a related device, which are used for solving the technical problem that in the prior art, the emission of sulfur dioxide and hydrogen chloride often exceeds the standard due to the fact that the flow of lime slurry and the spraying of dry lime powder cannot be accurately controlled.
In view of the above, the first aspect of the present application provides a deacidification control method for a waste incineration boiler, including:
obtaining multiple groups of historical data corresponding to the flow of lime slurry and sulfur dioxide and hydrogen chloride in the flue gas;
respectively comparing sulfur dioxide and hydrogen chloride in the multiple groups of historical data with corresponding smoke emission limit values to obtain first smoke with higher smoke emission value exceeding standard;
screening out a first group of data of lime slurry flow corresponding to the first flue gas based on a least square method and fitting to obtain a corresponding relation formula of the first flue gas;
and controlling the flow of the lime slurry according to the corresponding relation and a preset first flue gas concentration control value.
Optionally, the controlling the flow rate of the lime slurry according to the corresponding relation and a preset first flue gas concentration control value, and then further includes:
s01, acquiring a sulfur dioxide concentration value and a hydrogen chloride concentration value in the incinerator according to a preset period, and calculating a sulfur dioxide concentration change rate and a hydrogen chloride concentration change rate of the preset period according to the sulfur dioxide concentration value and the hydrogen chloride concentration value;
s02, judging whether the sulfur dioxide concentration change rate or the hydrogen chloride concentration change rate exceeds a preset change rate in a preset time period, and whether the sulfur dioxide concentration value or the hydrogen chloride concentration value exceeds a preset concentration value, if so, executing a step S03, otherwise, returning to the step S01;
and S03, spraying slaked lime into the deacidification tower until the sulfur dioxide concentration change rate and the hydrogen chloride concentration change rate are both lower than 0 and the sulfur dioxide concentration value and the hydrogen chloride concentration value are both lower than threshold concentration values, and stopping spraying slaked lime into the deacidification tower.
Optionally, the controlling the flow rate of the lime slurry according to the corresponding relation and a preset first flue gas concentration control value specifically includes:
and controlling the flow of the lime slurry through a PID controller according to the corresponding relation and a preset first flue gas concentration control value.
Optionally, step S03 specifically includes:
and starting a slaked lime dry powder fan for x seconds, spraying slaked lime into the deacidification tower until the sulfur dioxide concentration change rate and the hydrogen chloride concentration change rate are both lower than 0 and lower than threshold concentration values, stopping spraying slaked lime into the deacidification tower after y seconds, and stopping the slaked lime dry powder fan after z seconds, wherein x, y and z are positive integers.
Optionally, x, y, z are 30, 60, 30, respectively.
This application second aspect provides a msw incineration boiler deacidification control system, the system includes:
the acquisition unit is used for acquiring multiple groups of historical data corresponding to the flow of the lime slurry and sulfur dioxide and hydrogen chloride in the flue gas;
the comparison unit is used for respectively comparing the sulfur dioxide and the hydrogen chloride in the multiple groups of historical data with corresponding smoke emission limit values to obtain first smoke with higher smoke emission value exceeding standard;
the fitting unit is used for screening out a first group of data of lime slurry flow corresponding to the first flue gas based on a least square method and fitting the data to obtain a corresponding relation of the first flue gas;
and the first control unit is used for controlling the flow of the lime slurry according to the corresponding relation and a preset first flue gas concentration control value.
Optionally, the method further comprises:
the calculation unit is used for acquiring a sulfur dioxide concentration value and a hydrogen chloride concentration value in the incinerator according to a preset period, and calculating a sulfur dioxide concentration change rate and a hydrogen chloride concentration change rate of the preset period according to the sulfur dioxide concentration value and the hydrogen chloride concentration value;
the judging unit is used for judging whether the sulfur dioxide concentration change rate or the hydrogen chloride concentration change rate exceeds a preset change rate in a preset time period or not and whether the sulfur dioxide concentration value or the hydrogen chloride concentration value exceeds a preset concentration value or not, if so, the second control unit is triggered, and if not, the calculation unit is triggered;
and the second control unit is used for spraying slaked lime into the deacidification tower until the sulfur dioxide concentration change rate and the hydrogen chloride concentration change rate are both lower than 0 and the sulfur dioxide concentration value and the hydrogen chloride concentration value are both lower than threshold concentration values, and stopping spraying the slaked lime into the deacidification tower.
Optionally, the second control unit is specifically configured to:
and starting a slaked lime dry powder fan for x seconds, spraying slaked lime into the deacidification tower until the sulfur dioxide concentration change rate and the hydrogen chloride concentration change rate are both lower than 0 and lower than threshold concentration values, stopping spraying slaked lime into the deacidification tower after y seconds, and stopping the slaked lime dry powder fan after z seconds, wherein x, y and z are positive integers.
The third aspect of the present application provides a waste incineration boiler deacidification control apparatus, the apparatus includes treater and memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the steps of the deacidification control method for the waste incineration boiler according to the first aspect.
A fourth aspect of the present application provides a computer-readable storage medium for storing program code for executing the deacidification control method of the waste incineration boiler according to the first aspect.
According to the technical scheme, the method has the following advantages:
according to the deacidification control method for the waste incineration boiler, firstly, multiple sets of historical data corresponding to multiple sets of sulfur dioxide and hydrogen chloride are obtained, then, the sulfur dioxide and the hydrogen chloride in each set of data are compared, first flue gas which is easy to exceed the standard is judged, a set of lime slurry flow and the first flue gas which accord with the corresponding relation are screened out and fitted according to the principle of a least square method, a corresponding relation formula of the first flue gas is obtained, and therefore the lime slurry flow is controlled according to the relation formula; furthermore, in consideration of the unknown change of the garbage components, the concentrations of sulfur dioxide and hydrogen chloride generated by the garbage incineration boiler are in the unknown change process, and the situation that the clean flue gas sulfur dioxide and the hydrogen chloride exceed the standard still sometimes occurs by the lime slurry control method; therefore, by monitoring the concentration value of sulfur dioxide and the concentration value of hydrogen chloride in the incinerator and monitoring the change rate of the concentration of sulfur dioxide and the change rate of the concentration of hydrogen chloride, when one factor exceeds the standard, the slaked lime dry powder fan is controlled to spray slaked lime into the deacidification tower until the factor does not exceed the standard. The deacidification control method can enable the deacidification control of the waste incineration boiler to be more accurate, the concentration of sulfur dioxide and hydrogen chloride in clean flue gas does not exceed the standard, the limestone consumption of the waste incineration boiler can be reduced, and the cost is saved. Therefore, the technical problem that the emission of sulfur dioxide and hydrogen chloride often exceeds the standard due to the fact that the flow of lime slurry and the spraying of lime dry powder cannot be accurately controlled in the prior art is solved.
Drawings
Fig. 1 is a schematic flow chart of a first embodiment of a deacidification control method for a waste incineration boiler provided in an embodiment of the present application;
fig. 2 is a schematic flow chart of a second embodiment of a deacidification control method for a waste incineration boiler provided in the embodiment of the present application;
fig. 3 is a schematic flow chart of an embodiment of a deacidification control system of a waste incineration boiler provided in an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
Referring to fig. 1, a deacidification control method for a waste incineration boiler according to an embodiment of the present application includes:
step 101, obtaining multiple sets of historical data corresponding to the flow of lime slurry and sulfur dioxide and hydrogen chloride in the flue gas.
It should be noted that in this embodiment, a set of corresponding data of lime slurry flow qsh (i) and clean flue gas SO2, HCL concentrations SO2(i), and HCL (i) is obtained through the historical operating conditions of the deacidification system, and the number of data sets is not less than 3600 sets, that is, i >3600 sets.
And 102, respectively comparing sulfur dioxide and hydrogen chloride in the multiple groups of historical data with corresponding smoke emission limit values to obtain first smoke with higher smoke emission value exceeding standard.
It can be understood that, according to the data of SO2(i) and HCL (i), judging whether SO2 is easily out of standard or HCL is easily out of standard, selecting a smoke component which is easily out of standard, if HCL (i) (first smoke).
And 103, screening out a first group of data of the lime slurry flow corresponding to the first flue gas based on a least square method, and fitting to obtain a corresponding relation of the first flue gas.
It should be noted that, in this embodiment, a group of lime slurry flow rates qsh (j) and hcl (j) data (j < i) that meet the corresponding relationship is screened out according to the principle of least square method, which may be used to fit and determine the obtained data to obtain the following relationship:
QSH＝f1(HCL) (1)
and 104, controlling the flow of the lime slurry according to the corresponding relation and a preset first flue gas concentration control value.
It should be noted that according to formula (1), under the condition of setting the concentration of clean flue gas HCL, the required lime slurry flow QSH can be calculated; next, in the present embodiment, the automatic control of the lime slurry adjustment valve is realized by using the PID controller.
The utility model provides a refuse incineration boiler deacidification control method, at first acquire multiunit sulfur dioxide, the multiunit historical data that the hydrogen chloride corresponds, sulfur dioxide and hydrogen chloride are compared in to every group data afterwards, judge out easy superscript first flue gas, according to the least square principle, select a set of lime thick liquid flow and first flue gas and carry out the fitting that accord with the corresponding relation, obtain the corresponding relational expression of first flue gas, thereby control lime thick liquid flow according to this relational expression, effectively make refuse incineration boiler's deacidification control more accurate, SO2 and HCL concentration in the clean flue gas do not exceed standard, and can reduce refuse incineration boiler's lime stone consumption, and the cost is saved. Therefore, the technical problem that SO2 and HCL emission often exceeds the standard due to the fact that the flow of lime slurry cannot be accurately controlled in the prior art is solved.
The above is a method for controlling deacidification of a waste incineration boiler provided in the first embodiment of the present application, and the following is a method for controlling deacidification of a waste incineration boiler provided in the second embodiment of the present application.
Referring to fig. 2, a deacidification control method for a waste incineration boiler according to a second embodiment of the present application includes:
step 201, obtaining multiple sets of historical data corresponding to the flow of lime slurry and sulfur dioxide and hydrogen chloride in the flue gas.
Step 202, comparing sulfur dioxide and hydrogen chloride in the multiple sets of historical data with corresponding smoke emission limit values respectively to obtain first smoke with higher smoke emission value exceeding standard.
And 203, screening a first group of data of the lime slurry flow corresponding to the first flue gas based on a least square method, and fitting to obtain a corresponding relation of the first flue gas.
And 204, controlling the flow of the lime slurry according to the corresponding relation and a preset first flue gas concentration control value.
It should be noted that the steps 201-204 are the same as the description of the steps 101-104 in the embodiment, please refer to the description of the steps 101-104, and the description thereof is not repeated herein.
Due to the unknown variation of the garbage components, the concentrations of SO2 and HCL generated by the garbage incineration boiler are in the unknown variation process, and the situation that the clean flue gas SO2 and HCL exceed the standards still occurs from time to time by the lime slurry control method of the steps 201 and 204, and the automatic control of the dry lime powder injection fan needs to be further performed.
Step 205, obtaining a sulfur dioxide concentration value and a hydrogen chloride concentration value in the incinerator according to a preset period, and calculating a sulfur dioxide concentration change rate and a hydrogen chloride concentration change rate of the preset period according to the sulfur dioxide concentration value and the hydrogen chloride concentration value.
It should be noted that, in this embodiment, first, the upper control limits (preset concentration values) of the concentrations of the clean flue gas HCL and the SO2 are determined, such as 50mg/m 3; then, the change rate D of the HCL and SO2 concentrations in a certain time is calculated on line respectivelyHCLAnd DSO2If the time is set to 10s, the difference between the HCL and SO2 concentration at the current time and the HCL and SO2 concentration before 10s is calculated.
Step 206, judging whether the sulfur dioxide concentration change rate or the hydrogen chloride concentration change rate exceeds a preset change rate in a preset time period, and whether the sulfur dioxide concentration value or the hydrogen chloride concentration value exceeds a preset concentration value, if so, executing step 207, otherwise, returning to step 205.
It should be noted that, at the present moment, the concentration of HCL or SO2 exceeds a certain value C1, for example, C1 may be set to 30mg/m 3; rate of change D of HCL and SO2 concentrations over timeHCLOr DSO2Exceeding a certain value C2 (preset rate of change), for example, C2 can be set to 0.1mg/m 3/s; dHCLOr DSO2The duration of exceeding the fixed value C2 exceeds 10s, and when the data sampling frequency is 1s, namely, the change rate exceeds the C2 value in 10 times of calculation. When the above 3 conditions are satisfied, step 207 is executed, otherwise, step 205 is returned to.
And step 207, spraying slaked lime into the deacidification tower until the sulfur dioxide concentration change rate and the hydrogen chloride concentration change rate are both lower than 0 and the sulfur dioxide concentration value and the hydrogen chloride concentration value are both lower than threshold concentration values, and stopping spraying slaked lime into the deacidification tower.
It should be noted that, in this embodiment, first, the slaked lime dry powder blower is started, and a timing t1 is started; when t1>Opening the variable-frequency air lock device for 30s, and starting to spray slaked lime into the deacidification tower; then when the following conditions are met, the concentration of HCL and SO2 at the current moment is lower than a fixed value C1; 2. rate of change D in HCL and SO2 concentrations over 10sHCLAnd DSO2Are all less than 0; 3. t1>60 s; closing the variable frequency gas locking device, stopping spraying slaked lime into the deacidification tower, and starting timing t 2; when t2>And 30s, stopping the slaked lime dry powder fan.
According to the deacidification control method for the waste incineration boiler, firstly, multiple sets of historical data corresponding to multiple sets of sulfur dioxide and hydrogen chloride are obtained, then, the sulfur dioxide and the hydrogen chloride in each set of data are compared, first flue gas which is easy to exceed the standard is judged, a set of lime slurry flow and the first flue gas which accord with the corresponding relation are screened out and fitted according to the principle of a least square method, a corresponding relation formula of the first flue gas is obtained, and therefore the lime slurry flow is controlled according to the relation formula; furthermore, in consideration of the unknown change of the garbage components, the concentrations of sulfur dioxide and hydrogen chloride generated by the garbage incineration boiler are in the unknown change process, and the situation that the clean flue gas sulfur dioxide and the hydrogen chloride exceed the standard still sometimes occurs by the lime slurry control method; therefore, by monitoring the concentration value of sulfur dioxide and the concentration value of hydrogen chloride in the incinerator and monitoring the change rate of the concentration of sulfur dioxide and the change rate of the concentration of hydrogen chloride, when one factor exceeds the standard, the slaked lime dry powder fan is controlled to spray slaked lime into the deacidification tower until the factor does not exceed the standard. The deacidification control method can enable the deacidification control of the waste incineration boiler to be more accurate, the concentration of sulfur dioxide and hydrogen chloride in clean flue gas does not exceed the standard, the limestone consumption of the waste incineration boiler can be reduced, and the cost is saved. Therefore, the technical problem that the emission of sulfur dioxide and hydrogen chloride often exceeds the standard due to the fact that the flow of lime slurry and the spraying of lime dry powder cannot be accurately controlled in the prior art is solved.
The above is a waste incineration boiler deacidification control method provided by the second embodiment of the present application, and the following is a waste incineration boiler deacidification control system provided by the second embodiment of the present application.
Referring to fig. 3, an embodiment of the present application provides a deacidification control system for a waste incineration boiler, including:
the obtaining unit 301 is configured to obtain multiple sets of historical data corresponding to the flow rate of the lime slurry and the sulfur dioxide and hydrogen chloride in the flue gas.
The comparison unit 302 is configured to compare the sulfur dioxide and the hydrogen chloride in the multiple sets of historical data with corresponding smoke emission limit values, respectively, to obtain a first smoke with a higher smoke emission value exceeding the standard.
The fitting unit 303 is configured to screen out a first group of data of the lime slurry flow rate corresponding to the first flue gas based on a least square method and perform fitting to obtain a corresponding relation of the first flue gas.
And the first control unit 304 is configured to control the flow rate of the lime slurry according to the corresponding relation and a preset first flue gas concentration control value.
Further, still include:
the calculating unit 305 is configured to obtain a sulfur dioxide concentration value and a hydrogen chloride concentration value in the incinerator according to a preset period, and calculate a sulfur dioxide concentration change rate and a hydrogen chloride concentration change rate of the preset period according to the sulfur dioxide concentration value and the hydrogen chloride concentration value.
The judging unit 306 is configured to judge whether the change rate of the sulfur dioxide concentration or the change rate of the hydrogen chloride concentration exceeds a preset change rate in a preset time period, and whether the sulfur dioxide concentration or the hydrogen chloride concentration exceeds a preset concentration, if so, trigger the second control unit, and otherwise trigger the calculating unit.
And a second control unit 307, configured to spray slaked lime into the deacidification tower, and stop spraying slaked lime into the deacidification tower until the sulfur dioxide concentration change rate and the hydrogen chloride concentration change rate are both lower than 0, and the sulfur dioxide concentration value and the hydrogen chloride concentration value are both lower than the threshold concentration values.
Further, this application still provides a msw incineration boiler deacidification controlgear, its characterized in that, equipment includes treater and memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the deacidification control method of the waste incineration boiler according to the method embodiment according to the instructions in the program codes
Further, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used for storing program codes, and the program codes are used for executing the deacidification control method of the waste incineration boiler according to the above method embodiments.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. A deacidification control method for a waste incineration boiler is characterized by comprising the following steps:
obtaining multiple groups of historical data corresponding to the flow of lime slurry and sulfur dioxide and hydrogen chloride in the flue gas;
respectively comparing sulfur dioxide and hydrogen chloride in the multiple groups of historical data with corresponding smoke emission limit values to obtain first smoke with higher smoke emission value exceeding standard;
screening out a first group of data of lime slurry flow corresponding to the first flue gas based on a least square method and fitting to obtain a corresponding relation formula of the first flue gas;
and controlling the flow of the lime slurry according to the corresponding relation and a preset first flue gas concentration control value.
2. The deacidification control method for a waste incineration boiler according to claim 1, wherein the flow of the lime slurry is controlled according to the corresponding relation and a preset first flue gas concentration control value, and then the method further comprises the following steps:
s01, acquiring a sulfur dioxide concentration value and a hydrogen chloride concentration value in the incinerator according to a preset period, and calculating a sulfur dioxide concentration change rate and a hydrogen chloride concentration change rate of the preset period according to the sulfur dioxide concentration value and the hydrogen chloride concentration value;
s02, judging whether the sulfur dioxide concentration change rate or the hydrogen chloride concentration change rate exceeds a preset change rate in a preset time period, and whether the sulfur dioxide concentration value or the hydrogen chloride concentration value exceeds a preset concentration value, if so, executing a step S03, otherwise, returning to the step S01;
and S03, spraying slaked lime into the deacidification tower until the sulfur dioxide concentration change rate and the hydrogen chloride concentration change rate are both lower than 0 and the sulfur dioxide concentration value and the hydrogen chloride concentration value are both lower than threshold concentration values, and stopping spraying slaked lime into the deacidification tower.
3. The deacidification control method for a waste incineration boiler according to claim 1, wherein the flow of the lime slurry is controlled according to the corresponding relation and a preset first flue gas concentration control value, and specifically comprises the following steps:
and controlling the flow of the lime slurry through a PID controller according to the corresponding relation and a preset first flue gas concentration control value.
4. The deacidification control method for the waste incineration boiler according to claim 2, wherein the step S03 specifically includes:
and starting a slaked lime dry powder fan for x seconds, spraying slaked lime into the deacidification tower until the sulfur dioxide concentration change rate and the hydrogen chloride concentration change rate are both lower than 0 and lower than threshold concentration values, stopping spraying slaked lime into the deacidification tower after y seconds, and stopping the slaked lime dry powder fan after z seconds, wherein x, y and z are positive integers.
5. The deacidification control method for a waste incineration boiler according to claim 4, wherein x, y and z are respectively 30, 60 and 30.
6. The utility model provides a msw incineration boiler deacidification control system which characterized in that includes:
the acquisition unit is used for acquiring multiple groups of historical data corresponding to the flow of the lime slurry and sulfur dioxide and hydrogen chloride in the flue gas;
the comparison unit is used for respectively comparing the sulfur dioxide and the hydrogen chloride in the multiple groups of historical data with corresponding smoke emission limit values to obtain first smoke with higher smoke emission value exceeding standard;
the fitting unit is used for screening out a first group of data of lime slurry flow corresponding to the first flue gas based on a least square method and fitting the data to obtain a corresponding relation of the first flue gas;
and the first control unit is used for controlling the flow of the lime slurry according to the corresponding relation and a preset first flue gas concentration control value.
7. The waste incineration boiler deacidification control system according to claim 6, further comprising:
the calculation unit is used for acquiring a sulfur dioxide concentration value and a hydrogen chloride concentration value in the incinerator according to a preset period, and calculating a sulfur dioxide concentration change rate and a hydrogen chloride concentration change rate of the preset period according to the sulfur dioxide concentration value and the hydrogen chloride concentration value;
a determining unit, configured to determine whether the sulfur dioxide concentration change rate or the hydrogen chloride concentration change rate exceeds a preset change rate in a preset time period, and whether the sulfur dioxide concentration value or the hydrogen chloride concentration value exceeds a preset concentration value, if yes, performing step S03, otherwise, returning to step S01;
and the second control unit is used for spraying slaked lime into the deacidification tower until the sulfur dioxide concentration change rate and the hydrogen chloride concentration change rate are both lower than 0 and the sulfur dioxide concentration value and the hydrogen chloride concentration value are both lower than threshold concentration values, and stopping spraying the slaked lime into the deacidification tower.
8. The deacidification control system of a waste incineration boiler according to claim 7, wherein the second control unit is specifically configured to:
and starting a slaked lime dry powder fan for x seconds, spraying slaked lime into the deacidification tower until the sulfur dioxide concentration change rate and the hydrogen chloride concentration change rate are both lower than 0 and lower than threshold concentration values, stopping spraying slaked lime into the deacidification tower after y seconds, and stopping the slaked lime dry powder fan after z seconds, wherein x, y and z are positive integers.
9. The utility model provides a msw incineration boiler deacidification controlgear which characterized in that, equipment includes treater and memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the deacidification control method of the waste incineration boiler according to any one of the claims 1 to 5 according to the instructions in the program code.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium is configured to store program code for performing the method for deacidification control of a waste incineration boiler according to any one of the claims 1 to 5.
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