CN112999857B - Regulation and control method and regulation and control system for wide-load limestone slurry supply system - Google Patents

Regulation and control method and regulation and control system for wide-load limestone slurry supply system Download PDF

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CN112999857B
CN112999857B CN202110204955.9A CN202110204955A CN112999857B CN 112999857 B CN112999857 B CN 112999857B CN 202110204955 A CN202110204955 A CN 202110204955A CN 112999857 B CN112999857 B CN 112999857B
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dilution water
limestone slurry
slurry
limestone
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CN112999857A (en
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谷小兵
袁照威
宁翔
肖海平
李建强
孟磊
李婷彦
白玉勇
魏建鹏
闫欢欢
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Datang Environment Industry Group Co Ltd
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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
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    • B01D53/34—Chemical or biological purification of waste gases
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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
    • B01D53/48—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
    • B01D53/504—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 device
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    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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Abstract

The invention provides a regulation and control method and a regulation and control system for a wide-load limestone slurry supply system. The regulation and control method comprises the following steps: electrically operated valve control of dilution water: controlling a dilution water electric valve for controlling the opening and closing of a dilution water pipeline according to the limestone slurry demand; controlling a dilution water regulating valve: controlling a dilution water regulating valve for regulating the water quantity of a dilution water pipeline according to the limestone slurry demand and the limestone slurry supply; frequency control of a frequency converter of a slurry supply pump: and controlling the frequency of the frequency converter of the slurry supply pump for adjusting the limestone supply amount according to the limestone slurry demand, the limestone slurry supply amount and the limestone slurry flow set value. The regulation and control method can regulate the supply amount of limestone slurry in real time according to the load and the change of the sulfur content of the coal, avoids pipeline abrasion and pipeline slurry deposition caused by too high or too low slurry flow rate, and effectively realizes the pH value and SO of a desulfurization system2And (4) stably controlling the emission concentration.

Description

Regulation and control method and regulation and control system for wide-load limestone slurry supply system
Technical Field
The invention relates to the technical field of flue gas desulfurization of coal-fired power plants, in particular to a regulation and control method and a regulation and control system for a wide-load limestone slurry supply system.
Background
In the electric power industry of China, most of energy consumption is from coal combustion, and a large amount of atmospheric pollutants are generated in the coal combustion process, so that the problem of serious environmental pollution is caused. SO (SO)2Is one of the main pollutants discharged by coal-fired power plants, and can generate various harmful substances through a series of physical and chemical reactions after being discharged into the atmosphere, thereby causing great damage to the environment and human bodies. The limestone-gypsum wet desulphurization technology becomes the flue gas desulphurization technology which is widely applied at present, the absorbent generally adopts limestone slurry, and the limestone slurry is sprayed into the absorption tower through a slurry supply pump, thereby realizing SO2SO that control of the limestone slurry is effective in controlling SO2The discharge has an important role.
At present, the limestone slurry amount is mainly controlled by a variable frequency pump under the conditions of load and SO2In a certain range of variation, it can effectively control the amount of limestone slurry, but still has the following problems: the current unit participates in deep peak regulation, the changes of unit load, coal sulfur and the like are severe, and the limestone slurry amount cannot be adjusted in real time along with the load and the coal sulfur, SO that SO is easily caused2Excessive discharge, thereby causing economic loss, environmental pollution and the like; ② the frequency conversion of the current limestone slurry amount is controlled at SO2With a higher load, but at SO2When the load is low, only the slurry supply pump can be shut down, so that the slurry supply pump is frequently started and stopped, the service life of the supply pump is reduced, and the operation cost is high; the existing control mode easily causes the deposition of slurry in a pipeline, causes the blockage of the pipeline and influences the operation of a desulfurization system.
Therefore, aiming at the existing problems, under the condition of deep peak shaving of the current unit, if the load of the unit changes rapidly and the sulfur content of the fire coal is changeable, SO is realized2The standard-reaching discharge is realized, and how to realize the control and adjustment of limestone slurry under full load becomes the problem to be solved urgently for the desulfurization system of the thermal power plant.
Disclosure of Invention
The invention aims to provide a regulation and control method for a wide-load limestone slurry supply systemThe method and the system can adjust the supply amount of limestone slurry in real time according to the change of load and the sulfur content of the fire coal, avoid the pipeline abrasion and the pipeline slurry deposition caused by the over-high or over-low flow rate of the slurry, and effectively realize the pH value and the SO of a desulfurization system2And (4) stably controlling the emission concentration.
The invention provides a regulation and control method for a wide-load limestone slurry supply system, which comprises the following steps:
electrically operated valve control of dilution water: controlling a dilution water electric valve for controlling the opening and closing of a dilution water pipeline according to the limestone slurry demand;
controlling a dilution water regulating valve: controlling a dilution water regulating valve for regulating the water quantity of a dilution water pipeline according to the limestone slurry demand and the limestone slurry supply;
frequency control of a frequency converter of a slurry supply pump: and controlling the frequency of the frequency converter of the slurry supply pump for adjusting the limestone supply amount according to the limestone slurry demand, the limestone slurry supply amount and the limestone slurry flow set value.
In the present invention, the limestone slurry supply system includes a dilution water pipeline and a limestone slurry pipeline (i.e., a slurry supply pipeline). The dilution water electric valve is mainly used for controlling the opening and closing of the dilution water pipeline, the opening of the dilution water electric valve indicates that the process water is supplied to the slurry supply pipeline, and the closing of the dilution water electric valve indicates that the process water is stopped being supplied to the slurry supply pipeline. The dilution water regulating valve is mainly used for regulating the amount of process water and has a regulating effect only when the dilution water electric valve is opened. And a pulp supply pump is arranged on the pulp supply pipeline and is regulated and controlled through a pulp supply pump frequency converter. The control of the dilution water electric valve, the control of the dilution water regulating valve and the frequency control of the slurry supply pump frequency converter are mainly used for controlling the dilution water electric valve, the dilution water regulating valve and the slurry supply pump frequency converter respectively.
The control of the electric valve of the dilution water, the control of the adjusting valve of the dilution water and the frequency control of the frequency converter of the slurry supply pump comprise: judging whether the requirement of limestone slurry is larger than the lower limit value of the limestone slurry and the condition of delaying for n seconds is met; wherein the lower limit value of the limestone slurry isThe delay time n is mainly obtained by analyzing the operation data, and the limestone slurry demand can be obtained according to SO2And the concentration, the unit load, the pH value and the slurry density are calculated.
Specifically, the calculation formula of the limestone slurry demand is as follows:
Figure BDA0002949990130000031
in the formula: q is limestone slurry demand, alpha is desulfurization efficiency, pHMIs the pH correction factor, i.e. the ratio of the pH set value to the pH measured value, ρ is the density of the limestone slurry, MSO2Is SO2Load, i.e. flue gas quantity and inlet SO2The product of the concentrations.
In the present invention, the electrically operated valve control of the dilution water further includes: controlling the electric valve of the dilution water to be interlocked when the conditions are met, or controlling the electric valve of the dilution water to be interlocked; namely: and controlling the electric valve of the dilution water to be interlocked when the requirement of the limestone slurry is larger than the lower limit value of the limestone slurry and the delay is n seconds, or controlling the electric valve of the dilution water to be interlocked.
In the present invention, the dilution water adjustment valve control method further includes: performing manual control when the condition is met, or performing automatic control; namely: and carrying out manual control when the requirement of limestone slurry is larger than the lower limit value of the limestone slurry and the condition of delaying for n seconds is met, or carrying out automatic control.
In the control method of the dilution water regulating valve, the manual control is the control of the operator of the desulfurization system; the automatic control is PID control, which outputs the opening parameter of the dilution water regulating valve according to the deviation of the limestone slurry supply and the limestone slurry demand, at this time, the limestone slurry demand is a process variable and can be obtained according to the on-site slurry flow meter, and the limestone slurry demand is a set value.
In the invention, the frequency control method of the frequency converter of the slurry supply pump comprises a first-stage control and a second-stage control; wherein:
the first level of control includes: carrying out automatic control when the conditions are met, or carrying out manual control; namely: and automatically controlling when the requirement of limestone slurry is larger than the lower limit value of the limestone slurry and the condition of delaying for n seconds is met, or manually controlling.
The second level of control comprises: performing manual control when the condition is met, or performing automatic control; namely: and carrying out manual control when the requirement of limestone slurry is larger than the lower limit value of the limestone slurry and the condition of delaying for n seconds is met, or carrying out automatic control.
And the frequency parameter of the slurry supply pump frequency converter output by the frequency control of the slurry supply pump frequency converter is the sum of the first-stage control output parameter and the second-stage control output parameter.
Specifically, in the first-stage control, the manual control is the control of the operator of the desulfurization system; the automatic control is PID control, which outputs the frequency parameter of the frequency converter of the slurry supply pump according to the deviation of the supply quantity of the limestone slurry and the demand quantity of the limestone slurry, wherein the demand quantity of the limestone slurry is a process variable, and the supply quantity of the limestone slurry is a set value.
In the second-stage control, the manual control is the control of the operator of the desulfurization system; the automatic control is PID control, which outputs the frequency parameter of the frequency converter of the slurry supply pump according to the deviation of the limestone slurry flow set value and the limestone slurry supply amount, at the moment, the limestone slurry flow set value is a process variable and can be obtained according to the test data, and the limestone slurry supply amount is a set value.
The invention also provides a regulation and control system for the wide-load limestone slurry supply system, which comprises a dilution water electric valve control unit, a dilution water regulating valve control unit and a slurry supply pump frequency converter frequency control unit; the dilution water electric valve control unit, the dilution water regulating valve control unit and the slurry supply pump frequency converter frequency control unit are respectively used for executing the dilution water electric valve control, the dilution water regulating valve control and the slurry supply pump frequency converter frequency control in the regulation and control method.
The regulation and control method and the regulation and control system can regulate the supply amount of limestone slurry in real time according to the changes of load and the sulfur content of the fire coal, avoid pipeline abrasion and pipeline slurry deposition caused by overhigh or overlow slurry flow rate, and effectively realize the pH value and SO of a desulfurization system2The stable control of the emission concentration has important guiding significance for controlling the pollutant emission of the coal-fired unit.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a logic diagram of a regulation method for a wide-load limestone slurry supply system according to an embodiment of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms also include the plural forms unless the context clearly dictates otherwise, and further, it is understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present 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.
Example 1
Referring to fig. 1, the limestone slurry supply system of this embodiment includes a dilution water pipeline and a slurry supply pipeline, a dilution water electric valve and a dilution water regulating valve are arranged on the dilution water pipeline, a slurry supply pump is arranged on the slurry supply pipeline, and the supply pump is regulated and controlled by a slurry supply pump frequency converter.
The regulation and control method for the wide-load limestone slurry supply system comprises the following control logics:
1. dilution water electric valve control
The electric valve of the dilution water is mainly used for controlling the on-off of the pipeline of the dilution water, the opening of the electric valve indicates that the process water is supplied to the slurry supply pipeline, and the opening of the electric valve indicates that the process water is stopped being supplied to the slurry supply pipeline; and the control logic of the electric valve of the dilution water mainly controls the electric valve of the dilution water for controlling the opening and closing of the pipeline of the dilution water according to the demand of limestone slurry.
Specifically, the dilution water electric valve control logic is as follows: if the demand of limestone slurry of the desulfurization system is greater than the lower limit value of the limestone slurry, delaying for a certain n seconds by a delay block, closing the electric valve of the dilution water in a linkage manner, otherwise opening the electric valve in a linkage manner; wherein, the lower limit value of limestone slurry and the delay time n seconds are mainly obtained by analyzing the operation data, and the demand of limestone slurry is mainly obtained by SO2Calculating the concentration, the unit load, the pH value and the slurry density according to the following calculation formula:
Figure BDA0002949990130000061
in the formula: q is limestone slurry demand, alpha is desulfurization efficiency, pHMIs the pH correction factor, i.e. the ratio of the pH set value to the pH measured value, ρ is the density of the limestone slurry, MSO2Is SO2Load, i.e. flue gas quantity and inlet SO2The product of the concentrations.
2. Control of dilution water regulating valve
The dilution water regulating valve is mainly used for regulating the process water quantity, a certain relation exists between the control process and the control process of the dilution water electric valve, and the control process has a regulating effect only when the dilution water electric valve is opened; the dilution water adjustment valve control logic controls a dilution water adjustment valve for adjusting the amount of water in the dilution water line based primarily on the limestone slurry demand and the limestone slurry supply.
Specifically, the dilution water regulating valve control comprises two control loops, one is a manual control loop, and the other is an automatic control loop; the switching conditions of the two control loops are: the limestone slurry requirement is greater than the lower limit value of the limestone slurry, and the limestone slurry is delayed for a certain n seconds by the delay block, if the condition is met, the control loop is a manual control loop; otherwise, the control is automatic.
The manual control loop is mainly controlled by the desulfurization system operator.
The automatic control loop is mainly PID control, the input of the automatic control loop is the deviation of limestone slurry supply and limestone slurry demand, wherein the limestone slurry supply is a process variable, the limestone slurry demand is a set value, the limestone slurry supply is obtained according to an on-site slurry flow meter, and PID control parameters are determined according to the limestone slurry demand, the limestone slurry supply and the opening parameter of the dilution water regulating valve.
3. Frequency control of slurry supply pump frequency converter
And the frequency control logic of the frequency converter of the slurry supply pump mainly controls the frequency of the frequency converter of the slurry supply pump for adjusting the limestone supply quantity according to the limestone slurry demand quantity, the limestone slurry supply quantity and the limestone slurry flow set value.
Specifically, the frequency control logic of the frequency converter of the slurry supply pump is mainly two-stage control; wherein:
the first-stage control comprises two control loops, one is a manual control loop, the other is an automatic control loop, and the switching conditions of the two processes are as follows: the limestone slurry requirement is greater than the lower limit value of the limestone slurry, and the limestone slurry is delayed for a certain n seconds by the delay block, if the condition is met, the automatic control loop is adopted; otherwise, it is a manual control loop. The manual control loop is mainly controlled by the operating personnel of the desulfurization system; the automatic control loop is mainly PID control, the input of the automatic control loop is the deviation of the limestone slurry demand and the limestone slurry supply, wherein the limestone slurry demand is a process variable, the limestone slurry supply is a set value, and the PID control parameters are determined according to the limestone slurry demand, the limestone slurry supply and the variable frequency output parameters of the slurry supply pump.
The second-stage control comprises two control loops, one is a manual control loop, the other is an automatic control loop, and the switching conditions of the two processes are as follows: the limestone slurry requirement is greater than the lower limit value of the limestone slurry, and the limestone slurry is delayed for a certain n seconds by the delay block, if the condition is met, the control loop is a manual control loop; otherwise, it is an automatic control loop. The manual control loop is mainly controlled by the operating personnel of the desulfurization system; the automatic control loop is mainly PID control, the input is the deviation of limestone slurry flow set value and limestone slurry supply quantity, wherein, the limestone slurry flow set value is process variable, the limestone slurry supply quantity is set value, the limestone slurry flow set value is obtained according to the test data, and the PID control parameter is determined according to the slurry supply quantity and the variable frequency output parameter of the slurry supply pump.
The frequency value of the frequency converter of the slurry supply pump is the sum of the output parameters of the two-stage control loop.
The lower limit value of the limestone slurry is 6.5m3H, setting slurry flow of 6m3The control logic is specifically explained with a delay time of 20 s:
(1) dilution water electric valve control
The required amount of limestone slurry is more than 6.5m3H, after delaying for 20s, closing the diluting electric regulating valve;
the required amount of limestone slurry is less than 6.5m3H, and after a delay of 20s, the dilution electrovalve is opened.
(2) Control of dilution water regulating valve
The required amount of limestone slurry is less than 6.5m3And h, controlling the dilution electric regulating valve to be switched to automatic control, and controlling the opening degree of the dilution water regulating valve by taking the deviation between the limestone slurry supply amount and the limestone slurry demand amount as the input of a PID (proportion integration differentiation) controller.
When the required amount of limestone slurry is more than 6.5m3And h, controlling the dilution electric regulating valve to be switched to manual control.
(3) Frequency control of slurry supply pump frequency converter
The required amount of limestone slurry is more than 6.5m3And during the period of/h, the primary PID controller of the slurry supply pump frequency converter is switched into automatic control, and the deviation between the limestone slurry demand and the limestone slurry supply is used as input to control the frequency of the frequency converter.
The required amount of limestone slurry is less than 6.5m3During the period of/h, switching the primary PID controller of the frequency converter of the slurry supply pump into manual control, and keeping the output value at the moment; at the moment, the second-stage PID controller of the frequency converter of the slurry supply pump is switched to automatic control, and the limestone flow set value is 6m3And the deviation between the/h and the limestone slurry supply amount is used as the input of a secondary PID controller, and the frequency of the slurry supply pump frequency converter is controlled after the generated frequency revision value is summed with the output kept by the primary PID controller.
The control logic of the embodiment can adjust the supply amount of limestone slurry in real time according to the load and the change of the sulfur content of the fire coal, avoids the pipeline abrasion and the pipeline slurry deposition caused by the over-high or over-low flow rate of the slurry, and effectively realizes the pH value and SO of the desulfurization system2And (4) stably controlling the emission concentration.
Example 2
The embodiment provides a regulation and control system for a wide-load limestone slurry supply system, which is used for executing the regulation and control method in the embodiment 1; specifically, the regulation system comprises:
1. dilution water electric valve control unit
The dilution water electric valve control unit is mainly used for controlling a dilution water electric valve used for controlling the opening and closing of a dilution water pipeline according to the limestone slurry demand, can judge whether the requirement of the limestone slurry is larger than the lower limit value of the limestone slurry and delay n seconds, and controls the linkage of the dilution water electric valve when the requirement is met, otherwise controls the linkage of the dilution water electric valve.
2. Control unit of dilution water regulating valve
The dilution water regulating valve control unit is mainly used for controlling a dilution water regulating valve used for regulating the water quantity of a dilution water pipeline according to the limestone slurry demand and the limestone slurry supply, can judge whether the requirement of the limestone slurry is larger than the lower limit value of the limestone slurry and the delay is n seconds, and carries out manual control when the requirement is met, or else carries out automatic control.
Wherein, the manual control is the control of the desulfurization system operator; the automatic control is PID control which outputs an opening parameter of the dilution water adjusting valve according to a deviation of the limestone slurry supply amount from the limestone slurry demand amount.
3. Frequency control unit of frequency converter of slurry supply pump
And the frequency control unit of the frequency converter of the slurry supply pump is mainly used for controlling the frequency of the frequency converter of the slurry supply pump for adjusting the limestone supply amount according to the limestone slurry demand amount, the limestone slurry supply amount and the limestone slurry flow set value.
The frequency control unit of the frequency converter of the slurry supply pump can judge whether the requirement of limestone slurry is larger than the lower limit value of the limestone slurry and the condition of delaying for n seconds is met, and the frequency control unit comprises a first-stage control and a second-stage control, wherein the first-stage control carries out automatic control when the condition is met, or else, the first-stage control carries out manual control; and the second-level control is manually controlled when the condition is met, or is automatically controlled.
In the first-stage control, the manual control is the control of the operator of the desulfurization system; the automatic control is PID control, which outputs the frequency parameter of the frequency converter of the slurry supply pump according to the deviation of the supply quantity of the limestone slurry and the demand quantity of the limestone slurry.
In the second-stage control, the manual control is the control of the operator of the desulfurization system; the automatic control is PID control, which outputs the frequency parameter of the frequency converter of the slurry supply pump according to the deviation of the limestone slurry flow set value and the limestone slurry supply quantity.
And the frequency parameter of the slurry supply pump frequency converter output by the frequency control unit of the slurry supply pump frequency converter is the sum of the first-stage control output parameter and the second-stage control output parameter.
The regulation and control system of the embodiment can regulate the supply amount of limestone slurry in real time according to the change of load and sulfur content of coal, avoids pipeline abrasion and pipeline slurry deposition caused by too fast or too slow slurry flow rate, and effectively realizes the pH value and SO of a desulfurization system2And (4) stably controlling the emission concentration.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. A regulation and control method for a wide-load limestone slurry supply system is characterized by comprising the following steps:
electrically operated valve control of dilution water: controlling a dilution water electric valve for controlling the opening and closing of a dilution water pipeline according to the limestone slurry demand;
controlling a dilution water regulating valve: controlling a dilution water regulating valve for regulating the water quantity of a dilution water pipeline according to the limestone slurry demand and the limestone slurry supply;
frequency control of a frequency converter of a slurry supply pump: controlling the frequency of a frequency converter of a slurry supply pump for adjusting the limestone supply amount according to the limestone slurry demand, the limestone slurry supply amount and the limestone slurry flow set value;
dilution water electric valve control, dilution water damper valve control and confession stuff pump converter frequency control include: judging whether the requirement of limestone slurry is larger than the lower limit value of the limestone slurry and the condition of delaying for n seconds is met;
the frequency control method of the slurry supply pump frequency converter comprises a first-stage control and a second-stage control; wherein:
the first level of control includes: carrying out automatic control when the conditions are met, or carrying out manual control;
the second level of control comprises: performing manual control when the condition is met, or performing automatic control;
the frequency parameter of the slurry supply pump frequency converter output by the frequency control of the slurry supply pump frequency converter is the sum of the first-stage control output parameter and the second-stage control output parameter;
the formula for calculating the required amount of limestone slurry is as follows:
Figure FDA0003243341940000011
in the formula: q is limestone slurry demand, alpha is desulfurization efficiency, pHMIs the pH correction factor, i.e. the ratio of the pH set value to the pH measured value, ρ is the density of the limestone slurry, MSO2Is SO2Load, i.e. flue gas quantity and inlet SO2The product of the concentrations.
2. The regulation method of claim 1, wherein the dilution water electric valve control further comprises: and controlling the electric valve of the dilution water to be interlocked when the condition is met, or controlling the electric valve of the dilution water to be interlocked.
3. The regulation method according to claim 1, wherein the dilution water adjustment valve control method further comprises: and carrying out manual control when the condition is met, or carrying out automatic control.
4. A conditioning method according to claim 3, wherein the manual control is a desulfurization system operator control; the automatic control is PID control which outputs an opening parameter of the dilution water adjusting valve according to a deviation of the limestone slurry supply amount from the limestone slurry demand amount.
5. The regulation and control method of claim 1, wherein in the first stage of control, the manual control is a desulfurization system operator control; the automatic control is PID control, which outputs the frequency parameter of the frequency converter of the slurry supply pump according to the deviation of the supply quantity of the limestone slurry and the demand quantity of the limestone slurry.
6. The method of claim 1, wherein in the second level of control, the manual control is a desulfurization system operator control; the automatic control is PID control, which outputs the frequency parameter of the frequency converter of the slurry supply pump according to the deviation of the limestone slurry flow set value and the limestone slurry supply quantity.
7. A regulation and control system for a wide-load limestone slurry supply system is characterized by comprising a dilution water electric valve control unit, a dilution water regulating valve control unit and a slurry supply pump frequency converter frequency control unit; wherein the control unit of the electric valve of the dilution water, the control unit of the adjusting valve of the dilution water and the frequency control unit of the frequency converter of the slurry supply pump are respectively used for executing the control of the electric valve of the dilution water, the control of the adjusting valve of the dilution water and the frequency control of the frequency converter of the slurry supply pump in the adjusting and controlling method of any one of claims 1 to 6.
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